CN1080780A - Switch - Google Patents

Abstract

Switch of the present invention, by the 1st conductor that is connected with joint, the 2nd conductor and the 3rd conductor that are provided with fixed contact constitute fixed contact, with the 3rd conductor arrangement at the other end of not establishing moving contact than the more close movable contact in position of fixed contact, and be positioned at the reciprocal position of above-mentioned joint, with the 1st conductor arrangement when the closing of contact contact contact-making surface above, simultaneously, when the contact disconnects, be positioned at moving contact contact-making surface below, utilize this structure, all current paths of fixed contact all produce the electromagnetic force that electric arc is stretched to joint one side position, so, can obtain excellent current limiting performance.

Description

Switch

For example the present invention relates to the switch of electric arc takes place in circuit-breaker and flow restricter or electromagnetic contactor etc. in container when cutting off electric current.

Fig. 1 is as the switch that has the earlier end view of the off-state of circuit-breaker for example, and Fig. 2 is the end view of the state after the contact of Fig. 1 circuit-breaker has just been left, and Fig. 3 is the end view that the maximum of movable contact head in Fig. 2 circuit-breaker is left state.Among the figure, the 1st, the movable contact of circuit-breaker, this movable contact 1 are supported on the rotating fulcrum (center of rotation) 14 of end (referring to Fig. 2 and Fig. 3), can be that rotate at the center with this rotating fulcrum 14.The 2nd, be fixed on the moving contact of an end (free-ended below) of above-mentioned movable contact 1, the 3rd, fixed contact, rotation by above-mentioned movable contact 1, it is come in contact with moving contact 2 and separate, 4 is fixed contacts that an end is equipped with fixed contact 3, about the shape and structure of this fixed contact 4, the back is described again.The 5th, the joint of the power end that is connected with the other end of said fixing contact 4.The 6th, arc extinguishing board, when separated above-mentioned moving contact 2 and said fixing contact 3, arc extinguishing board 6 had the function that the electric arc that will take place between these contacts elongates and cools off.The 7th, be used for fixing the arc extinguishing side plate of above-mentioned arc extinguishing board 6.The 8th, the driving mechanism that above-mentioned movable contact 1 is rotated, the current detector (not shown) is equipped with in the inside of this driving mechanism 8, and the short circuit current that detects according to this current detector moves.The 9th, operate the handle of above-mentioned driving mechanism 8 with manual methods, the 10th, the joint of load end, the 11st, the conductor that this joint 10 is connected with above-mentioned movable contact 1.The 12nd, the container of the component parts of interior these circuit-breakers of dress, 13 are provided in a side of the steam vent on the sidewall of this container 12.

Below, illustrate that the formation of said fixing contact 4 constitutes.In Fig. 1～Fig. 3, the said fixing contact 4 whole shapes that constitute by conductor 4a, conductor 4b, conductor 4c, conductor 4d and conductor 4e that form, conductor 4a is connected with the joint 5 of power end, extends to horizontal direction; Conductor 4b bends downwards from the last and above-mentioned joint 5 opposite ends of conductor 4a, and 4a is vertical with conductor; Conductor 4c extends to the horizontal direction opposite with above-mentioned conductor 4a from the lower end of conductor 4b, forms step-like; Conductor 4d extends upward from the front end edge vertical direction of conductor 4c; Conductor 4e extends to horizontal direction towards above-mentioned conductor 4a on one side from the upper end of conductor 4d.On above-mentioned conductor 4e, be provided with fixed contact 3.

In the fixed contact 4 that this shape constitutes, the conductor 4d that connects the conductor 4c of step-like bottom and fixed contact 3 is configured in than the other end of not establishing moving contact 2 of the more close moving contact 1 in the position of fixed contact 3 and is positioned on the reciprocal position of joint 5, conductor 4e with fixed contact 3 is positioned on the same horizontal plane with the conductor 4a with joint 5, when moving contact 2 and fixed contact 3 are in contact with one another, be positioned at this contact contact-making surface below.Such fixed contact 4 uses with the uninsulated naked state in its whole surface.

Below, its action is described.

Under the state of Fig. 1, the joint 5 of fixed contact 4 is connected with power supply, simultaneously, the joint 10 of load end is connected with load.

Under this state, if with handle 9 towards the actuating of arrow B direction, then driving mechanism 8 action, movable contact 1 with the rotating fulcrum 14(of end referring to Fig. 2 and Fig. 3) be that the center rotates, thereby reach the closure state that moving contact 2 contacts with fixed contact 3, from power supply to the load supply capability.Under this state, in order to ensure the reliability of energising, moving contact 2 is pressed on the fixed contact 3 with the contact pressure of regulation.

If in load circuit, be short-circuited accident etc., when circuit flow is crossed very big short electric current, after the current detector in the above-mentioned driving mechanism 8 detects this big electric current, just make above-mentioned driving mechanism 8 actions from circuit-breaker.So movable contact 1 rotates to the direction that contact separation is opened, and makes moving contact 2 leave fixed contact 3.When contact separation is opened, as shown in Figures 2 and 3, between moving contact 2 and fixed contact 3 electric arc A appears.

But, usually, when big electric current such as short circuit current flow, on the contact-making surface of moving contact 2 and fixed contact 3, electromagnetic repulsive force is very strong, and in order to overcome the contact pressure that is added on the above-mentioned moving contact 2, movable contact 1 grade is just rotated to the direction that contact separation is opened less than the action of driving mechanism 8.

Therefore, separate with fixed contact 3 owing to this rotation makes moving contact 2, the electric arc A that takes place between above-mentioned contact 2 and 3 is elongated and cooling by arc extinguishing board 6.As a result, arc resistance rises, and produces the metering function that short circuit current is reduced, and at current zero, above-mentioned electric arc A extinguishes, thereby cuts off electric current.

In order to improve the defencive function of circuit-breaker, current limliting is very important.In order to improve current limiting performance, as mentioned above, should increase arc resistance.

In order to increase arc resistance, as the method for elongating electric arc, what often use is to utilize for example special clear 60-49533 communique and the special method of opening the fixed contact of shape shown in the flat 2-68831 communique opened.

The shape of the fixed contact that above-mentioned communique disclosed, the shape with the fixed contact 4 of Fig. 1～shown in Figure 3 is identical basically.

In Fig. 1～Fig. 3, the current path that fixed contact 4 limits is joint 5 order process conductor 4a, 4b, 4c, 4d and the 4e from power end, arrives fixed contact 3 then.

In such current path, the electric current of the conductor 4e below the fixed contact of the fixed contact 4 of flowing through 3 becomes the power to the stretching of arc extinguishing board 6 directions with electric arc A to the electromagnetic force of electric arc A effect.As a result, can obtain the circuit-breaker that arc resistance is higher, current limiting performance is good.

In order to improve the current limiting performance of common interchange disjunction, as mentioned above, should improve arc resistance, still, and at this moment, must be after just to have separated contact 2,3, electric current does not improve arc resistance before reaching maximum as yet.After electric current increases,,, be difficult to electric current is carried out current limliting also owing to the inertia effect of electric current even improve arc resistance.On the contrary, because big electric current and high resistance increase the arc energy that takes place in circuit breaker, so, to the damage severity of circuit breaker.Therefore, the electric arc after the shape of fixed contact should be able to just have been separated contact 2,3 with very strong electromagnetic force elongates greatly, improves arc resistance sharp.

But, because having the switch of the fixed contact shape that has earlier is made of said structure, so, as shown in Figure 2, in the contact 2,3 make after just having separated movable contact 1 to the direction action that disconnects, and make the conductor 4e of electric arc A below the power source path of the fixed contact 4 of the electromagnetic force of the joint 5 directions elongation of power end is fixed contact 3 simultaneously.Other current path (conductor) 4a, 4b, 4c, 4d hinder the disconnection action of movable contact 1, and take place electric arc A to the electromagnetic force of elongating with above-mentioned joint 5 rightabouts.Because the electric current of current path 4d is identical with the sense of current of above-mentioned electric arc A, attract each other with electric arc, the current opposite in direction of the electric current of current path 4b and above-mentioned electric arc A is repelled mutually with electric arc, so, they respectively with electric arc A to the side of joint 5 drawing in the opposite direction.In addition, the current opposite in direction of the electric current of current path 4a and 4c and current path 4e, produce with above-mentioned electric arc A to the side of joint 5 electromagnetic force of drawing in the opposite direction.

In addition, as mentioned above, to the integral body of above-mentioned movable contact 1 the just current path 4e of fixed contact 4, because it is identical with the sense of current of movable contact 1 to flow through the electric current of other current path 4a and 4c to rotation direction effect electromagnetic force, so, movable contact 1 is applied the electromagnetic force that makes it closed.Flow through center of rotation 14 one sides of the electric current of current path 4d, apply the electromagnetic force of rotation direction, still,, apply the electromagnetic force of closing direction in moving contact 2 one sides at movable contact 1.

Therefore, utilize the shape of the employed fixed contact 4 of switch that has earlier, the electromagnetic force that flows through the electric current of said fixing contact 4 can not make electric arc A elongate effectively.In addition, the electromagnetic force that unique high speed to movable contact 1 disconnects the current path 4e of contributive fixed contact 4 also increases with the distance between the two along with the rotation of above-mentioned movable contact 1 and sharply reduces, other current path 4a of the electromagnetic force that disconnects action takes place to hinder, 4b, 4c, the influence of the electric current of 4d relatively increases, thereby, opening speed is reduced.Therefore, can not reach needed current limiting performance.

Fig. 4 is for example special disclosed end view as the circuit breaker closing state that switch is arranged earlier of clear 60-49535 communique of opening, Fig. 5 has only movable contact to be in the end view of off-state among Fig. 4, Fig. 6 is the movable contact of Fig. 4 and repels the end view that contact all is in off-state.

Among the figure, the 101st, the electrical contact of circuit-breaker (hereinafter referred to as movable contact), this movable contact 101 can be that center of rotation is rotated with the fulcrum P1 of end as shown in Figure 7 and Figure 8.The 102nd, be fixed on the contact below the free end of above-mentioned movable contact 101, the 103rd, be configured in another electrical contact (repulsion contact) of the below of above-mentioned movable contact 101, this electrical contact 103 is that center of rotation is rotated with the axle P2 of its end also.The 104th, be fixed on above the free end of above-mentioned another electrical contact 103 with 102 contact and another contacts of separating, above-mentioned contact, above-mentioned movable contact 101 and above-mentioned another electrical contact 103 constitute a pair of electrical contact.

The 105th, the joint of power-supply system, the 106th, the conductor that above-mentioned another electrical contact 103 and above-mentioned joint 105 are electrically connected, 107 is the 1st conductors that an end is connected with above-mentioned joint 105, extends in the following direction horizontal direction of above-mentioned movable contact 101, the 108th, be connected with the other end of the 1st conductor 107, below above-mentioned movable contact 101 upwardly extending the 2nd conductor, constitute above-mentioned conductor 106 by above-mentioned the 1st conductor 107 and the 2nd conductor 108.Wherein, above-mentioned the 2nd conductor 108 has pliability, does not hinder the rotation of above-mentioned electrical contact 103.In addition, the end of above-mentioned repulsion contact 103 is connected with the upper end of above-mentioned the 2nd conductor 108 by above-mentioned axle P2, can freely rotate.

The 109th, be contained in the hank knotting spring on the end connecting axle P2 of electrical contact 103, the 110th, the driving mechanism that above-mentioned movable contact 101 is rotated, when the electric current (short circuit current) that flows through in the circuit-breaker greater than the specified current flow value, this driving mechanism 110 has automatically makes above-mentioned movable contact 101 to disconnecting the function that direction is rotated.Therefore, usually above-mentioned electrical contact 101 is called movable contact, in addition, later on contact 102 is called moving contact 102.The spring that 110a is provided in a side of on the case cover side of above-mentioned driving mechanism 110 buckles, and an end of above-mentioned hank knotting spring 109 hangs over this spring and buckles on the 110a, and the other end of hank knotting spring 109 hangs on the above-mentioned movable contact 101.Utilize such hank knotting spring 109, above-mentioned contact 102 and 104 is in contact with one another in the time of can making closure with the power of appointment.In addition, also be provided with the brake (not shown) of electrical contact 103, when above-mentioned movable contact 101 disconnects, can make above-mentioned electrical contact 103 keep position shown in Figure 5.

Therefore, if the power of effect during greater than the power of above-mentioned hank knotting spring 109, above-mentioned electrical contact 103 can rotate to the direction that disconnects.Like this, above-mentioned electrical contact 103 can repel with bigger power, so, later on this electrical contact 103 is called the repulsion contact, contact 104 is called repels the contact.

The 111st, operate the handle of above-mentioned driving mechanism 110 with manual methods, by operating this handle 111, can utilize manual methods to make above-mentioned movable contact 101 carry out switch motion.The 112nd, be used for discussing the brake of the maximum open position of above-mentioned repulsion contact 103 calmly, the 113rd, arc extinguishing board, the 114th, the fixing arc extinguishing side plate of arc extinguishing board 113, the 115th, the joint of load end, the 116th, the container of the said structure parts of built-in circuit circuit breaker, 117 are provided in a side of the steam vent on these container 116 sidewalls.

Below, its action is described.

In Fig. 4, by joint 105 is connected with power supply, another joint 115 is connected with load, can be with electric power from the power supply supply load.At this moment, moving contact 102 and repulsion contact 104 rely on the hank knotting spring 109 that presses spring (not shown) and repulsion contact 103 of movable contacts 101, with the contact pressure of appointment closure state as contact, under this closure state, flow through electric current in above-mentioned movable contact 101 and the above-mentioned repulsion contact 103, as shown in Figure 7.That is, electric current flows into from joint 105 along the direction shown in the thin arrow among Fig. 7, behind the 1st conductor 107 to the 2nd conductors 108, arrive and repel contact 103 to repelling contact 104, then, repel the contact-making surface of contact 104 and moving contact 102, arrive movable contact 101 by this.At last, the electric current of movable contact 101 flows into load end near the conductor the center of rotation P1.

As shown in Figure 7, flowing through the electric current that repels contact 103 and movable contact 101 is parallel reverse basically, so, between above-mentioned movable contact 101 and repulsion contact 103, act on electromagnetic repulsive force.Here, above-mentioned moving contact 102 and the contact pressure of repelling between the contact 104 are set greater than the electromagnetic repulsive force that is produced by common load current or the such little electric current of overload electric current, so, during little electric current, driving mechanism 110 is failure to actuate, and movable contact 101 rotates or repel contact 103 rotations, and above-mentioned moving contact 102 and repulsion contact 104 can not separated.

When cutting off common load current, utilize handle 111 to rotate movable contact 101, in addition, when flowing through the overload electric current, above-mentioned driving mechanism 110 can automatically move, and movable contact 101 is rotated to disconnection direction shown in Figure 5.At this moment, repelling contact 103 can't be by hank knotting spring 109 to disconnecting the direction action.This state is shown in Fig. 8.In Fig. 8, the power Fm of arc extinguishing board 113 directions is pointed in the magnetic field of flowing through the electric current generation of repelling contact 103 to electric arc A effect.As a result, electric arc A is stretched to above-mentioned Fm direction, by arc extinguishing board 113 coolings, arc extinguishing, finishes the cut-out action of electric current.

On the other hand, under the closure state of Fig. 7, when the such big electric current of short circuit current flow, the electromagnetic repulsive force F of effect will be greater than the pressure that is in contact with one another of contact 102 and 104 between movable contact 101 and repulsion contact 103, promptly greater than the active force that presses spring of hank knotting spring 109 and movable contact 101, so movable contact 101 and repulsion contact 103 begin respectively to rotate to the direction that disconnects.

As shown in Figure 9, because movable contact 101 and repel contact 103 twocoueses and disconnect direction and promptly move round about mutually, so, moving contact 102 and when repelling distance between the contact 104 and equaling that just movable contact 101 moves 2 times.So-called opening speed becomes 2 times.Therefore, after short circuit current began to flow through, movable contact 101 and repulsion contact 103 can reach the maximum state that turns at short notice, as shown in figure 10.

In addition, as previously mentioned, elongate electric arc A by electric arc A effect being pointed to the power Fm of arc extinguishing board 113 directions in the magnetic field of flowing through the electric current generation of repelling contact 103.As a result, arc voltage increases sharp, thereby can obtain good current limiting performance.By the electric arc A of this good electric current that current limiting performance reduced, be subjected to after the cooling effect of above-mentioned arc extinguishing board 113 by arc extinguishing.

Because the switch that has earlier constitutes in a manner described, so, utilize current path shown in Figure 7 can and repel between the contact 103 at movable contact 101 really and produce electromagnetic repulsive force, but, owing between repulsion contact 103 and the 1st conductor 107, also produce electromagnetic repulsive force, so this electromagnetic repulsive force becomes the disconnection direction opposite effect power with above-mentioned repulsion contact 103.In addition, the magnetic field of the 2nd conductor 108 generations to the electromagnetic force of repelling contact 103 effects also is and the disconnection direction opposite effect power of repelling contact 103.That is, produce rightabout electromagnetic force, so the repulsion contact 103 that makes that the electric current of movable contact 101 produces will reduce greatly to the electromagnetic force that disconnects the direction rotation owing to flow through the electric current of the 1st conductor 107 and the 2nd conductor 108.

In addition, as Fig. 9 and shown in Figure 10, along with movable contact 101 and repulsion contact 103 rotate to the direction that disconnects respectively, distance each other increases.Therefore, movable contact 101 and repulsion contact 103 are also weakened respectively to the electromagnetic repulsive force that disconnects the direction rotation.In contrast, the distance of repelling between contact 103 and the 1st conductor 107 and the 2nd conductor 108 is dwindled, and therefore, makes and repels contact 103 to the electromagnetic force increase of rotating in the opposite direction with the side of disconnectioning.As a result, after movable contact 101 and repulsion contact 103 rotated, the distance between the contact 102 and 104 was big more, made them more little to the electromagnetic force that disconnects the direction rotation.Particularly owing to make and repel contact 103 to the electromagnetic force increase of rotating in the opposite direction with disconnections side, so reducing of the electromagnetic force of disconnection direction is very remarkable.

According to the common configuration in the container 116 of circuit-breaker shown in Figure 4, for driving mechanism 110 is set, the length of repelling contact 103 is shorter than the length of movable contact 101.

Usually, when center of rotation is arranged on a claval end, square being directly proportional of the moment of inertia of this center of rotation and claval length relatively, moment and claval length are directly proportional.Therefore, the angular acceleration of this center of rotation and claval length are inversely proportional to relatively.With this relational application in movable contact 101 with when repelling contact 103, because it is short to repel contact 103, so, after just beginning short circuit current flow, the rotation of repelling contact 103 is faster than movable contact 101, can think that the i.e. contributions to current limiting performance of increase of repelling the arc length that takes place between 103 pairs of disconnections of contact initial stage contact 102 and 104 are big.

But, use the circuit-breaker of above-mentioned electrode structure, can not produce effectively to make and repel contact 103 to disconnecting the electromagnetic force that direction is rotated, so the rotation of repelling contact 103 is very slow, can not obtain the arc voltage that the needed initial stage of current limliting raises rapidly.

In addition, turn under the maximum state at repulsion contact 103 shown in Figure 10, because repulsion contact 103 is reduced greatly to the electromagnetic force that disconnects the direction rotation, so, after electric current reduces, when its electromagnetic force reduces slightly, under the power effect of hank knotting spring 109, repel contact 103 and be easy to get back to original position.Therefore, maximum after repulsion contact 103 turns to maximum even arc voltage reaches, repel contact 103 and also get started reversing, arc voltage is easy to reduce.

Though repel the electromagnetic force of electric arc A effect sensing arc extinguishing board 113 directions between 103 pairs of above-mentioned contacts 102 of contact and 104, but, owing to flow through the electric current of the 1st conductor 107 and flow through the current opposite in direction of repelling contact 103, so the electric current that flows through the 1st conductor 107 is to electric arc A effect and the opposite electromagnetic force of arc extinguishing board 113 directions.In addition because it is identical with the sense of current that flows through electric arc A to flow through the electric current of the 2nd conductor 108, so attract each other, with electric arc A to the direction attraction opposite with arc extinguishing board 113.Therefore, the electromagnetic force that is used for that electric arc A is elongated is just produced by the electric current that flows through repulsion contact 103, and the electric current that flows through the 1st conductor 107 and the 2nd conductor 108 then acts on rightabout electromagnetic force.As a result, electric arc A is weakened to the electromagnetic force of arc extinguishing board 113 directions elongation, electric arc can not prolong, and arc voltage can not improve.

As mentioned above, use the circuit-breaker that has earlier, for above-mentioned reasons etc., can not obtain satisfied current limiting performance equally.

In view of the foregoing, purpose of the present invention aims to provide a kind of switch, this switch is after just separate the contact, all current paths of fixed contact can both make arc voltage rise sharp, generation is elongated electromagnetic force from electric arc to tip side, and when the break distance of movable contact increases, after the electric arc cooling, high arc voltage can take place and keep, thereby has excellent current limiting performance.

Another object of the present invention is that a kind of switch that the opening speed of movable contact is risen by electromagnetic force rapidly will be provided.

The objective of the invention is to provide a kind of shaping handling ease of fixed contact and the switch that this fixed contact does not hinder the switch motion of movable contact.

The objective of the invention is to provide a kind of switch, the fixed contact of this switch does not hinder the switch motion of movable contact, and the disconnection initial stage at movable contact just can be cooled off electric arc, electric current is played metering function, simultaneously, in the latter half that disconnects action, pressure in the container reduces, and this pressure can not destroy container.

The objective of the invention is to provide a kind of switch, and this switch can prevent that the moving contact that electric arc causes from coming off, and can improve the mechanical strength of movable contact at above-below direction.

The objective of the invention is to provide a kind of switch, this switch is when big electric current such as short circuit current flow, movable contact is subjected to pointing to the big electromagnetic force that disconnects direction, can contact separation be opened, simultaneously, after just separate the contact, all electric currents that flow through fixed contact all elongate electric arc to the joint direction, arc length increases sharp, thereby arc voltage is risen sharp, and when the break distance of movable contact increases, after electric arc is cooled, high arc voltage can also take place and keep, thereby has excellent current limiting performance.

The objective of the invention is to provide a kind of switch, and this switch can maximally utilise 1 conductor after just disconnecting electric current attracts the power of movable contact, thereby can improve opening speed.

The objective of the invention is to provide a kind of switch, this switch is after just separate the contact, all current paths of fixed contact all produce the electromagnetic force that electric arc is elongated to the joint direction, thereby can improve arc voltage sharp, and when the break distance of movable contact increases, after electric arc is cooled, high arc voltage can take place and keep, thereby have excellent current limiting performance.

The objective of the invention is to provide a kind of switch, this switch is after just separate the contact, arc voltage increases sharp, and when disconnecting, the contact can cool off electric arc forcibly, thereby can keep high arc voltage, simultaneously, can reduce to be added in the lack of uniformity of the electromagnetic force on movable contact and the electric arc.

The objective of the invention is to provide a kind of switch, this switch applies strong driving magnetic field to electric arc after just disconnecting, thereby can bring into play the effect of arc extinguishing side plate greatly, under off-state, can cool off electric arc forcibly, thereby can improve the electric arc cooling effect, obtain excellent current limliting and cut off performance.

The objective of the invention is to provide a kind of switch, and this switch can cool off electric arc forcibly under the state state of contact disconnection, simultaneously, can increase the opening speed of movable contact, cuts off performance thereby have excellent current limliting.

The objective of the invention is to provide a kind of switch, and the current component of conductor elongated electric arc after this switch had just been separated in the contact to the joint direction, is cooled after touching arc extinguishing board, thereby can improves current limiting performance.

The objective of the invention is to provide a kind of switch, the arc voltage of this switch rises fast, the opposing magnetic field that fixed contact produces or not effect to electric arc, electric arc can be elongated to assigned direction, can further improve and keep the arc voltage at disconnection initial stage, cut off performance thereby have excellent current limliting.

The objective of the invention is to provide a kind of switch; the insulant that this switch utilizes electric arc and covers the 1st conductor contact the back and the gas of generation can prevent switch pressure inside abnormal ascending; simultaneously; can prevent insulation breakdown by the protection insulant; and high arc voltage can take place and keep; thereby can obtain to have the safe switch of excellent current limiting performance; in addition; can increase arc extinguishing board quantity effectively to electric arc; improve the cooling effect of electric arc, thereby can make the electric arc arc extinguishing fast.

The objective of the invention is to provide a kind of switch, and this switch cools off electric arc fast by the electric arc guide plate is set on the 2nd conductor, and high arc voltage can take place and keep, thereby can obtain to have the long-lived switch of excellent current limiting performance.

The objective of the invention is to provide a kind of switch, and this switch can be protected insulant by the electric arc guide plate is set on the 1st conductor, can obtain the switch of current limiting performance and cut-out excellent performance simultaneously.

The objective of the invention is to provide a kind of switch, and this switch can suppress to disconnect the internal pressure in later stage and rise by on the 1st conductor electrode being set, and prevents that container from breaking, and can obtain the switch of current limiting performance and cut-out excellent performance simultaneously.

The objective of the invention is to provide a kind of switch, and this switch can make electrical contact disconnect at a high speed when big failure of current, and current limiting performance is good.

The objective of the invention is to provide a kind of switch, and this switch also can apply the high-intensity magnetic field of the electric arc elongation that makes on the contact when little failure of current, thereby can obtain excellent current limiting performance and little current shut-off performance.

According to a first aspect of the invention, in order to achieve the above object, switch provided by the invention has movable contact, fixed contact and joint, and an end of movable contact has moving contact; One end of fixed contact has fixed contact, and this fixed contact utilizes the switch motion of movable contact to contact with above-mentioned moving contact and to separate; The other end of joint and this fixed contact is connected.In this switch, establish direction that the above-mentioned moving contact of contact closure condition opens from the said fixing contact separation when being the top, constitute the said fixing contact by the 1st conductor, the 2nd conductor and the 3rd conductor, the 1st conductor is connected with above-mentioned joint; Has the said fixing contact on the 2nd conductor; The 3rd conductor is connected the 1st conductor at above-below direction with the 2nd conductor, the 3rd conductor arrangement be not provided with an end of moving contact and is being positioned at the reciprocal position of above-mentioned joint than the more close movable contact in the position of said fixing contact, the 1st conductor arrangement when the above-mentioned closing of contact this contact contact-making surface above, simultaneously, above-mentioned contact is positioned at the contact-making surface below of above-mentioned moving contact when disconnecting, the position of above-mentioned the 1st conductor of seeing from above-mentioned moving contact surface when above-mentioned contact disconnects is coated with insulant.

Therefore, the switch of a first aspect of the present invention is after just separate the contact, and all electric currents that electric arc is flow through the conductor that constitutes fixed contact elongate to the joint direction, then, electric arc is extruded to again on the insulant that covers the 1st conductor, thereby high arc voltage can take place and keep.

According to a second aspect of the invention, switch provided by the invention, in the bonding conductor of jointing and fixed contact, in the close part that is connected with fixed contact, from the position of fixed contact to the opposite direction position of joint, parallel with movable contact basically part when the shape of fixed contact has closure.

Therefore, the switch of a second aspect of the present invention, in the fixed contact position of reciprocal the 2nd conductor of joint, parallel with movable contact basically part when fixed contact has the closing of contact is so the effect of electromagnetic force can improve the opening speed of movable contact.

According to a third aspect of the invention we, switch provided by the invention, fixed contact have the bonding conductor part that is the U font basically, and fixed contact is fixed on the inboard of an end of this U font, and the other end of above-mentioned U font is connected with joint; On the bonding conductor above the stationary plane that is positioned at the said fixing contact, be provided with and allow that the relative said fixing contact of movable contact produces the slit of switch motion.

Therefore, the switch of a third aspect of the present invention, fixed contact slightly are the U word shape, so the shaping processing of this fixed contact is quite easy.In addition, on the said fixing contact, the said fixing contact above being positioned at the stationary plane of fixed contact, is provided with the slit of allowing movable contact generation switch motion, so can not hinder the relative said fixing of above-mentioned movable contact contact to produce switch motion with the conductor position.

According to a fourth aspect of the present invention, the left side or the right of the trajectory plane that switch provided by the invention, the 1st conductor that makes fixed contact are described in the switch motion of movable contact are positioned at top, said fixing contact.

Therefore, the left side or the right of the trajectory plane that the switch of fourth aspect present invention is described in the switch motion of movable contact form the 1st conductor of fixed contact, so the said fixing contact can not hinder the switch motion of above-mentioned movable contact above fixed contact.In addition, at the disconnection initial stage of movable contact, the electric arc that takes place between the contact is capped the insulant cooling of the 1st conductor, can carry out current limliting to electric current.Cutting off the latter half of moving, electric arc is away from insulant, and the pressure that takes place in the container reduces, so the pressure that takes place in the container when producing the cut-out action can not cause the container breakage.

According to a fifth aspect of the present invention, switch provided by the invention, get when being left and right directions, but the width of moving-conductor that makes a part that constitutes movable contact is less than the width of moving contact with the vertical direction in plane that comprises the track that the movable contact switch motion describes.

Therefore, the switch of fifth aspect present invention, but the width of the moving-conductor left and right directions by making a part that constitutes movable contact is less than the width of moving contact, the stationary plane of moving contact is covered by electric arc, so, can prevent that moving contact from coming off, simultaneously, can increase the mechanical strength of movable contact above-below direction.

According to a sixth aspect of the invention, switch provided by the invention, the 1st conductor arrangement above-mentioned movable contact when the above-mentioned contact closure condition is provided with above-mentioned moving contact an end center, conduction road above, simultaneously, when above-mentioned contact is in off-state, be positioned at above-mentioned moving contact contact-making surface below, the position insulant coating of above-mentioned the 1st conductor of seeing from above-mentioned moving contact surface when above-mentioned contact is in off-state.

Therefore, the switch of sixth aspect present invention is when big electric current such as short circuit current flow, all electric currents that flow through the conductor that constitutes fixed contact make movable contact be subjected to pointing to the big electromagnetic force of disconnection direction and disconnection rapidly, make contact spacing from increase, simultaneously, after just separate the contact, all electric currents that flow through the conductor that constitutes the said fixing contact elongate electric arc to the joint direction, after arc length increases, arc voltage rises sharp, then, electric arc is compressed on the insulant that covers the 1st conductor, thereby can produce and keep high arc voltage.

According to a seventh aspect of the present invention, switch provided by the invention has the 1st conductor, the 1st conductor is provided with otch, this otch is along the plane that comprises the track that movable contact describes, be provided with fixed contact to such an extent that make under the state of the closing of contact, in perpendicular to plane that comprises above-mentioned track and the section vertical with the tangent plane of above-mentioned the 1st conductor, the straight line that connects above-mentioned otch the right and left conductor section center P 1 and P2, the angle θ in comprising the plane of above-mentioned track 1 and the θ 2 that constitute with each straight line of the section center P 3 of the movable contact conductor of a part that connects and composes movable contact and above-mentioned center P 1 and center P 2 equal 45 ± 10 °.

Therefore, the switch of seventh aspect present invention after disconnecting, can attract the electric current of the 1st conductor the active force of movable contact to use to greatest extent, therefore can improve opening speed.

According to an eighth aspect of the present invention, switch provided by the invention has movable contact and fixed contact, and an end of movable contact has moving contact; One end of fixed contact has fixed contact, rely on the switch motion of movable contact to contact with above-mentioned moving contact and to separate, with in power-supply system and the switch that fixed contact is connected, when the direction that above-mentioned moving contact and said fixing contact separation are opened when getting contact closure condition is the top, by the 1st conductor that is connected with above-mentioned power-supply system, have the 2nd conductor of said fixing contact and constitute the said fixing contact with the 3rd conductor that is connected the 1st conductor and the 2nd conductor at above-below direction, with above-mentioned the 3rd conductor arrangement at the other end of not establishing moving contact than the more close movable contact in position of said fixing contact, and be positioned at the opposite direction position of above-mentioned power-supply system, above-mentioned the 1st conductor arrangement when being positioned at the above-mentioned closing of contact this contact contact-making surface above, simultaneously, when above-mentioned contact disconnects, be positioned at above-mentioned moving contact contact-making surface below, and when opening, the contact always is in the top of the part of above-mentioned movable contact during from the closing of contact, when above-mentioned contact disconnected, the position of above-mentioned the 1st conductor of seeing from above-mentioned moving contact surface was by the insulant coating.

Therefore, the switch of a eighth aspect of the present invention is after just separate the contact, all electric currents that flow through the conductor that constitutes fixed contact elongate electric arc to the joint direction, and the 2nd conductor of fixed contact is to movable contact effect electromagnetic repulsive force, the 1st conductor effect electromagnetic attraction, thus above-mentioned movable contact can disconnect at a high speed.Then and since the part of movable contact when reaching maximum rotation, be in fixed contact the 1st conductor below because the effect of electromagnetic force and be subjected to the power of rotation direction continuously, therefore, above-mentioned movable contact can reach maximum rotation at short notice.As a result, arc voltage will increase sharp, and electric arc is expressed on the insulant that covers above-mentioned the 1st conductor by very strong electromagnetic force after, cooled off forcibly, thereby high arc voltage can take place and keep, and obtain the switch of current limiting performance excellence.

According to a ninth aspect of the present invention, switch provided by the invention forms the said fixing contact and slightly is the U word shape, the fixed contact that is fixed on an end of this fixed contact contacts with above-mentioned moving contact, the surface of separating is facing to the other end of said fixing contact, on the said fixing contact, be provided with slit, so that above-mentioned moving contact contacts with the said fixing contact, can not hinder the switch motion of above-mentioned movable contact during separation, one end of above-mentioned slit is positioned at the other end of said fixing contact, and the other end of slit is positioned at the position near the fixed contact of said fixing contact in the bottom of the U of said fixing contact font.

Therefore, the switch of ninth aspect present invention, as mentioned above, after just separate the contact, electric arc is elongated to the joint direction, movable contact disconnects at a high speed, high arc voltage can take place and keep, and simultaneously, the electric current that flows through movable contact will produce induced voltage over time around the slit of fixed contact, in order to reduce this induced voltage, constituted above-mentioned slit, the induced current around this slit is reduced, so, can make the current balance of slit two side conductors that flow through fixed contact, reduce unbalanced degree the electromagnetic force of movable contact and arcing.

According to a tenth aspect of the present invention, switch provided by the invention with above-mentioned the 1st conductor arrangement when the above-mentioned closing of contact this contact contact-making surface above, simultaneously, when above-mentioned contact disconnects, be positioned at above-mentioned moving contact contact-making surface below, the position of above-mentioned the 1st conductor that can see from above-mentioned moving contact surface when above-mentioned contact disconnects is by the insulant coating, simultaneously, the arc extinguishing side plate is configured in the both sides that comprise the plane of the track of moving contact when making above-mentioned movable contact switch, and one of them piece arc extinguishing side plate is arranged between above-mentioned plane and the part corresponding with above-mentioned the 1st conducting plane.

Therefore; the switch of tenth aspect present invention; the horizontal broad of arc extinguishing side plate; the electric arc that takes place between the contact is stoped by the arc extinguishing side plate of both sides; protect the 1st conductor part relative with electric arc, above-mentioned horizontal and vertical direction is from the rightabout expansion of fixed contact to power-supply system; at the disconnection initial stage, the electromagnetic force that is flow through all electric currents generations of the conductor that constitutes fixed contact hinders.As a result, above-mentioned electric arc only extends to the power-supply system direction, so arc voltage increases sharp.When movable contact disconnects, run into behind the insulated position of the 1st conductor that contact surface is seen from the hot gas of the electric arc of moving contact ejection and to be cooled off forcibly, so, can produce and keep high arc voltage.

According to an eleventh aspect of the present invention, switch provided by the invention, under the state that above-mentioned movable contact disconnects, above-mentioned moving contact is not projected into the top of above-mentioned arc extinguishing side plate.

Therefore, the present invention the tenth switch on the one hand, in the latter half of cutting off, after moving contact moved to the top of the 1st conductor, electric arc was not retrained by the arc extinguishing side plate, so the arc extinguishing side plate can not rise thereby can suppress pressure owing to electric arc is emitted gas.

According to a twelfth aspect of the present invention, switch provided by the invention, the position configuration of the contact-making surface of the said fixing contact that will contact with moving contact is below above-mentioned joint location, with the 3rd conductor arrangement at the other end of not establishing moving contact than the more close movable contact of said fixing contact position, and be positioned at the reciprocal position of above-mentioned joint, with the 1st conductor arrangement be positioned at when the above-mentioned contact closure condition contact-making surface position, above-mentioned contact above, simultaneously, the position insulant coating of above-mentioned the 1st conductor of seeing from above-mentioned moving contact surface when above-mentioned contact is in off-state is configured in arc extinguishing board the below of above-mentioned the 1st conductor.

Therefore, the switch of the present invention the 12 aspect is after just separate the contact, all electric currents that electric arc is flow through the conductor that constitutes fixed contact elongate to the joint direction, and then, electric arc is extruded to again on the insulant that covers the 1st conductor, so, can produce and keep high arc voltage.In addition, because under the strong magnetic field action that fixed contact produces, electric arc is just stretched to the joint direction after just separate the contact, moment just touches the arc extinguishing board of the 1st conductor below and is cooled, so, can improve current limiting performance.

According to the 13 aspect of the present invention, switch provided by the invention with the 1st conductor arrangement above fixed contact, and when movable contact is in off-state, be positioned at the below of the contact-making surface of moving contact, the position insulant coating of above-mentioned the 1st conductor of when off-state, seeing from the contact-making surface of moving contact, simultaneously, above above-mentioned the 1st conductor, magnetic sheet roughly parallel with the 1st conductor more than one is set, on this magnetic sheet, is provided with the incision space of the switch motion of allowing above-mentioned movable contact.

Therefore, the switch of the present invention the 13 aspect, after just disconnecting, all electric currents that flow through fixed contact produce the electromagnetic force of sensing power-supply system direction to the space of the 1st conductor below of fixed contact, drawing electric arc consumingly, so, the very fast rising of arc voltage, the electric current that flows through the said fixing contact is absorbed by magnetic sheet in the opposing magnetic field of the superjacent air space generation of above-mentioned the 1st conductor, so, under the off-state of movable contact, above-mentioned opposing magnetic field does not produce effect to the electric arc of the 1st conductor top, electric arc extends to the power-supply system direction, so the arc voltage that disconnects the initial stage can reach very high.

According to the 14 aspect of the present invention, the position configuration of the contact-making surface of the fixed contact that switch provided by the invention will contact with moving contact is below joint location, with the 3rd conductor arrangement at the other end of not establishing moving contact than the more close movable contact in position of fixed contact, and be positioned at the reciprocal position of joint, the 1st conductor arrangement is positioned at when the closing of contact contact contact-making surface the position above, simultaneously, when open the contact, be positioned at above-mentioned contact contact-making surface the position below, the position insulant coating of the 1st conductor of seeing from the moving contact surface when contact is in off-state, and arc extinguishing board is configured in the position that does not hinder movable contact to rotate, simultaneously, covering the insulant of the 1st conductor upper and lower, is the face contact with an arc extinguishing board in the arc extinguishing board at least on one side.

Therefore; the switch of the present invention the 14 aspect; insulant by making the upper and lower that covers the 1st conductor is the face contact with an arc extinguishing board in the arc extinguishing board at least on one side; rotation along with movable contact; after moving contact moves to the top of the 1st conductor; electric arc touches the gas that takes place behind the insulant that covers the 1st conductor can prevent switch pressure inside abnormal ascending, can protect insulant simultaneously.In addition, can increase the quantity of the arc extinguishing board that is arranged on the 1st conductor top effectively.

According to the 15 aspect of the present invention, switch provided by the invention is provided with the electric arc guide plate fixing on the 2nd conductor of fixed contact.

Therefore, the switch of the present invention the 15 aspect by the electric arc guide plate is set on the 2nd conductor, when contact separation is opened, can move on to the electric arc spot on the contact very soon on the electric arc guide plate, thereby can alleviate the damage of electric arc to fixed contact.

According to the 16 aspect of the present invention, switch provided by the invention is provided with the electric arc guide plate that electrically contacts with the 1st conductor.

Therefore, the switch of the present invention the 16 aspect by the electric arc guide plate that electrically contacts with the 1st conductor is set, can move on to the electric arc guide plate with the electric arc that disconnects the later stage, and electric arc is contacted with arc extinguishing board.

According to the 17 aspect of the present invention, switch provided by the invention on the insulant that covers the 1st conductor, is provided with the electrode with the fixed contact insulation.

Therefore, the switch of the present invention the 17 aspect, by the electrode that insulate with fixed contact is set on the insulant that covers the 1st conductor, when the moving contact face turned to the 1st conductor top, this electrode can cool off electric arc.In addition, the electric arc spot on the fixed contact can be maintained at last, thereby arc length is increased.

According to the 18 aspect of the present invention, switch provided by the invention has movable contact and repels contact, and an end of movable contact has moving contact; It is roughly parallel with above-mentioned movable contact to repel contact, and an end has the repulsion contact, can contact with above-mentioned moving contact and separate.In this switch, constitute the conductor that above-mentioned repulsion contact is connected with power-supply system by the 1st conductor and the 2nd conductor, when above-mentioned movable contact and above-mentioned repulsion contact were in off-state, the 1st conductor was at moving contact and repel between the contact, was connected with power-supply system; The 2nd conductor is connected the 1st conductor at the reciprocal end in above-mentioned repulsion contact with above-mentioned repulsion contact.

Therefore, the switch of the present invention's the tenth eight aspect, when short circuit current cuts off, the electric current that flows through movable contact and repulsion contact produces electromagnetic repulsive force, but, this electromagnetic repulsive force not only, and when to disconnecting directive effect when specifying the power of size flows through the electric current that will repel the 1st conductor that contact is connected with power-supply system also makes above-mentioned repulsion contact disconnection to the above-mentioned repulsion contact generation that disconnects action electromagnetic repulsive force.Therefore, can bring into play the current limiting performance of the very fast excellence of opening speed.

According to nineteen of the present invention aspect, switch provided by the invention is positioned at above-mentioned the 1st conductor arrangement in moving contact when above-mentioned movable contact and the above-mentioned repulsion contact closure and repels the surface of contact.

Therefore, the switch of the present invention the 19 aspect, when little failure of current, the repulsion contact is a closure state, and movable contact disconnects, when between the contact electric arc taking place, flow through with the electric current that repels the 1st conductor that contact is connected and the 2nd conductor also to the generation of the electric arc on the repulsion contact of above-mentioned repulsion contact electromagnetic force, so, electric arc can be elongated to suitable direction, thereby can obtain excellent current limiting performance and little current shut-off performance.

Below, above-mentioned purpose that present invention will be described in detail with reference to the accompanying and feature.Certainly, the invention is not restricted to illustrated embodiment.

Fig. 1 is the end view that the circuit-breaker that has earlier is in off-state;

Fig. 2 is the end view of the state after has just separated the contact of the circuit-breaker of Fig. 1;

Fig. 3 is the end view that movable contact is in maximum off-state in the circuit-breaker of Fig. 2;

Fig. 4 is the end view that is in closed condition as the circuit-breaker of the switch that has earlier;

Fig. 5 has only movable contact to be in the end view of off-state among Fig. 4;

Fig. 6 is the movable contact among Fig. 4 and repels the end view that contact all is in maximum off-state;

Fig. 7 is the end view that is in closure state for the electrode shown in the action that the circuit-breaker that has earlier is described;

Fig. 8 is movable contact becomes the electrode of off-state from the closure state of Fig. 7 a end view;

Fig. 9 is the movable contact of Fig. 4 and repels contact to the end view of the electrode that disconnects the direction operate condition;

Figure 10 is the movable contact among Fig. 9 and repels the end view that contact reaches the electrode of maximum off-state;

Figure 11 is the end view that the circuit-breaker of embodiment 1 is in the arc extinguishing part of closure state;

Figure 12 is the end view that the circuit-breaker of Figure 11 is in off-state;

Figure 13 (a) is the end view of the fixed contact of Figure 11;

Figure 13 (b) is the oblique view that the fixed contact with Figure 13 (a) insulated;

Figure 14 is the action specification figure of the state after has just separated the contact of the circuit-breaker of Figure 11;

Figure 15 (a) flows through the magnetic field distribution key diagram that the electric current of the fixed contact of Figure 12 produces;

Figure 15 (b) is the profile along the A-A line of Figure 15 (a);

Figure 15 (c) is on the Z axle of Figure 15 (b), flows through the magnetic field distribution curve chart of the electric current generation of fixed contact;

Figure 16 is the action specification figure that the movable contact of the circuit-breaker of Figure 11 reaches maximum off-state;

Figure 17 (a) is the oblique view of the fixed contact of embodiment 2;

Figure 17 (b) is the oblique view that the fixed contact with Figure 17 (a) insulated;

Figure 18 (a) be adopt the circuit-breaker of the fixed contact of Figure 17 (b) be in the contact just separated after the end view of major part of state;

Figure 18 (b) is the end view that Figure 18 (a) reaches the major part of the maximum off-state in contact;

Figure 19 is the end view of the major part of embodiment 3;

Figure 20 is the end view of the major part of embodiment 4;

Figure 21 is the end view of the major part of embodiment 5;

Figure 22 is the end view of the major part of embodiment 6;

Figure 23 is the end view of major part of the variation of embodiment 6;

Figure 24 is the end view of the major part of embodiment 7;

Figure 25 is the end view of the major part of embodiment 8;

Figure 26 is the end view of the major part of embodiment 9;

Figure 27 is the end view of the major part of embodiment 10;

Figure 28 (a) be embodiment 11 be in the contact just separated after the end view of major part of state;

Figure 28 (b) is the end view that Figure 28 (a) reaches the major part of the maximum off-state in contact;

Figure 29 is the end view of the major part of embodiment 12;

Figure 30 is the end view of the major part of embodiment 13;

Figure 31 is the end view of the major part of embodiment 14;

Figure 32 is the end view of the major part of embodiment 15;

Figure 33 is a vertical view of seeing the 2nd conductor of embodiment 16 from the top;

Figure 34 (a) sees the movable contact of embodiment 17 and the vertical view of fixed contact from the top;

Figure 34 (b) is the end view of Figure 34 (a);

Figure 35 sees the movable contact of embodiment 18 and the vertical view of fixed contact from the top;

Figure 36 sees the movable contact of embodiment 19 and the vertical view of fixed contact from the top;

Figure 37 is the end view of the movable contact of embodiment 20;

Figure 38 (a) is the plane graph of the major part of embodiment 21;

Figure 38 (b) is the end view of Figure 38 (a);

Figure 39 (a) is the end view of the movable contact of embodiment 22;

Figure 39 (b) is the profile along the B-B line of Figure 39 (a);

Figure 40 (a) is the key diagram of the general magnetic signature on the co-current plane of symmetry;

Figure 40 (b) is presentation graphs 40(a) in the curve chart of relation of angle θ and Y direction magnetic field B y;

Figure 40 (c) is the curve chart that the transverse axis of Figure 40 (b) is transformed to the length on the z axle according to the relation of z=atg θ;

Figure 41 (a) is the end view of the fixed contact of embodiment 23;

Figure 41 (b) is the profile along the C-C line of Figure 41 (a);

Figure 42 is the vertical view of a part of seeing the fixed contact of embodiment 23 from the top;

Figure 43 is the oblique view of the fixed contact of embodiment 24;

Figure 44 (a) is the end view of the fixed contact of Figure 43;

Figure 44 (b) is the profile along the C1-C1 line of Figure 44 (a);

Figure 44 (c) is the profile along the C2-C2 line of Figure 44 (a);

Figure 45 (a) is the oblique view of the fixed contact of embodiment 25;

Figure 45 (b) is the oblique view that the fixed contact with Figure 45 (a) insulated;

Figure 46 is the oblique view of the fixed contact of embodiment 26;

Figure 47 is that the variation of the fixed contact of embodiment 26 is the oblique view of embodiment 27;

Figure 48 is the oblique view of the fixed contact of embodiment 28;

Figure 49 is the end view that the circuit-breaker of embodiment 29 is in the arc extinguishing part of closure state;

Figure 50 is the end view that the circuit-breaker of Figure 49 is in off-state;

Figure 51 be the circuit-breaker of Figure 49 be in contact separation open before the action specification figure of state;

Figure 52 be the circuit-breaker of Figure 51 be in the contact just separated after the action specification figure of state;

Figure 53 (a) is the figure for the magnetic field distribution of the electric current generation that the fixed contact that flows through Figure 50 is described;

Figure 53 (b) is the profile along the A-A line of Figure 53 (a);

Figure 53 (c) is on the Z axle of Figure 53 (b), flows through the curve chart of the magnetic field distribution that the electric current of fixed contact produces;

Figure 54 is the action specification figure that the movable contact of the circuit-breaker of Figure 49 reaches maximum off-state;

Figure 55 (a) is the oblique view of the fixed contact of embodiment 30;

Figure 55 (b) is the oblique view that the fixed contact with Figure 55 (a) insulated;

Figure 56 (a) be adopt the circuit-breaker of the fixed contact of Figure 55 (b) be in the contact just separated after the end view of major part of state;

Figure 56 (b) is the end view that Figure 56 (a) reaches the major part of the maximum off-state in contact;

Figure 57 is the end view of the major part of embodiment 31;

Figure 58 is the end view of the major part of embodiment 32;

Figure 59 is the end view of the major part of embodiment 33;

Figure 60 is the end view of the major part of embodiment 34;

Figure 61 is the end view of the major part of embodiment 35;

Figure 62 is the end view of major part of the variation of embodiment 35;

Figure 63 is the end view of major part of other variation of embodiment 35;

Figure 64 is the end view of the major part of embodiment 36;

Figure 65 is the end view of the major part of embodiment 37;

Figure 66 is the end view of the major part of embodiment 38;

Figure 67 is the end view of major part of the variation of embodiment 38;

Figure 68 (a) is the end view of the major part of embodiment 39;

Figure 68 (b) is the profile along the B-B line of Figure 68 (a);

Figure 69 (a) is the end view of the fixed contact of embodiment 40;

Figure 69 (b) is the profile along the C-C line of Figure 69 (a);

Figure 70 is the oblique view of the fixed contact of embodiment 41;

Figure 71 is the oblique view of variation of the fixed contact of Figure 70;

Figure 72 is the oblique view of the fixed contact of embodiment 43;

Figure 73 is the end view that the circuit-breaker of embodiment 44 is in the arc extinguishing part of closure state;

Figure 74 is the end view that the circuit-breaker of Figure 73 is in off-state;

Figure 75 is the plane graph of the fixed contact among Figure 73 and Figure 74;

Figure 76 is the front elevation of Figure 75;

Figure 77 is the oblique view of Figure 75;

Figure 78 is the action specification figure that is used for embodiment 44, the end view that movable contact is in closure state;

Figure 79 is that the movable contact of Figure 78 is in the firm disconnection end view of state afterwards;

Figure 80 is the end view that the movable contact of Figure 79 reaches maximum off-state;

Figure 81 is the profile along the A-A of Figure 80;

Figure 82 is on the Z of Figure 81 axle, flows through the curve chart of the magnetic field distribution that the electric current of fixed contact produces;

Figure 83 is the end view of the major part of embodiment 45;

Figure 84 is the end view of the major part of embodiment 46;

Figure 85 is the end view of the major part of embodiment 47;

Figure 86 (a) is the front elevation of the fixed contact of embodiment 48;

Figure 86 (b) is the end view of Figure 86 (a);

Figure 86 (c) is the plane graph of Figure 86 (b);

Figure 87 is the oblique view of the fixed contact of embodiment 48;

Figure 88 is the oblique view of the fixed contact of embodiment 49;

Figure 89 is movable contact is in closure state with respect to the fixed contact of Figure 88 a end view;

Figure 90 is the end view that Figure 89 becomes off-state;

Figure 91 be Figure 89 become the contact just separated after the end view of state;

Figure 92 is the end view that the movable contact of Figure 91 reaches maximum off-state;

Figure 93 is the oblique view of the fixed contact identical with Figure 77;

Figure 94 is the oblique view of the fixed contact closure state of movable contact and Figure 93;

Figure 95 is the vertical profile of slit jaw S1 with the fixed contact of Figure 94;

Figure 96 is the plane graph of Figure 94;

Figure 97 is the profile vertical with the slit jaw S1 of Figure 95;

Figure 98 is in embodiment 49, calculates employed illustraton of model when asking the induced current size with the magnetic flux φ of the slit jaw S1 interlinkage of fixed contact and loop circuit C;

Figure 99 is the section coordinate diagram of Figure 98;

Figure 100 is the oblique view that the fixed contact of Figure 88 is omitted insulant;

Figure 101 is the computation model figure of Figure 100;

Figure 102 is the section coordinate diagram of Figure 101;

Figure 103 is the fixed contact of embodiment 50 and the end view that movable contact is in closure state;

Figure 104 is the fixed contact of embodiment 51 and the end view that movable contact is in off-state;

Figure 105 is the end view of the circuit-breaker of example in order to compare with embodiment 51;

Figure 106 is the end view of circuit-breaker that is used for the action specification of embodiment 51;

Figure 107 is the end view of the major part of embodiment 52;

Figure 108 is the action specification figure of Figure 107;

Figure 109 is the end view of the major part of the movable contact embodiment 53 that is in off-state;

Figure 110 is the end view that the movable contact of Figure 109 reaches maximum off-state;

Figure 111 is the oblique view of the fixed contact of embodiment 54;

Figure 112 is the plane graph of Figure 111;

Figure 113 is that movable contact and the fixed contact of embodiment 54 just disconnected the end view of state afterwards;

Figure 114 is the profile along the B-B line of Figure 113;

Figure 115 is the end view of variation of the fixed contact of embodiment 54;

Figure 116 is the end view of other variation of fixed contact of embodiment 54;

Figure 117 is the plane graph of Figure 116;

Figure 118 is the end view of another variation of the fixed contact of embodiment 54;

Figure 119 is the end view of the major part of embodiment 55 at closure state;

Figure 120 is the oblique view of the fixed contact of Figure 119;

Figure 121 is the oblique view of the fixed contact of Figure 119;

Figure 122 is the end view that Figure 121 reaches maximum off-state;

Figure 123 is the oblique view of variation of the fixed contact of embodiment 55;

Figure 124 is the end view that the circuit-breaker of embodiment 56 is in the arc extinguishing part of closure state;

Figure 125 is the end view that the circuit-breaker of Figure 124 is in off-state;

Figure 126 is the plane graph that contains the fixed contact of arc extinguishing side plate among Figure 124 and Figure 125;

Figure 127 is the front elevation of Figure 126;

Figure 128 is the oblique view of Figure 126;

Figure 129 is the action specification figure of circuit-breaker firm after separating state in the contact of embodiment 56;

Figure 130 is the profile along the A-A line of Figure 129;

Figure 131 is the action specification figure that the circuit-breaker of Figure 129 reaches maximum off-state;

Figure 132 is the profile along the B-B line of Figure 131;

Figure 133 is on the Z of Figure 132 axle, flows through the curve chart of the magnetic field distribution that the electric current of fixed contact produces;

Figure 134 is the end view that the circuit-breaker of embodiment 57 is in contact closure condition;

Figure 135 (a) is the electrode end view partly of the circuit-breaker of embodiment 58;

Figure 135 (b) is the front elevation that omits the movable contact of Figure 135 (a);

Figure 136 is the electrode end view partly of the circuit-breaker of embodiment 58;

Figure 137 is the electrode end view partly of the circuit-breaker of embodiment 60;

Figure 138 (a) is the electrode end view partly of the circuit-breaker of embodiment 61;

Figure 138 (b) is the profile along the C-C line of Figure 138 (a);

Figure 139 is the end view of circuit-breaker with variation arc extinguishing side plate of Figure 138;

Figure 140 is the end view of the circuit-breaker of embodiment 62;

Figure 141 is the front elevation of Figure 140;

Figure 142 is the end view of circuit-breaker of the variation of embodiment 62;

Figure 143 is the electrode end view partly of the circuit-breaker of embodiment 63;

Figure 144 is the end view of electrode part of circuit-breaker of the variation of embodiment 63;

Figure 145 (a) is the electrode end view partly of the circuit-breaker of embodiment 64;

Figure 145 (b) is the front elevation of Figure 145 (a);

Figure 146 (a) is the end view of power unit of the circuit-breaker of embodiment 65;

Figure 146 (b) is the profile along the D-D line of Figure 146 (a);

Figure 147 (a) is the electrode part end view of circuit-breaker of the variation of Figure 146 (a) and (b);

Figure 147 (b) is the profile along the E-E line of Figure 147 (a);

Figure 148 is the electrode end view partly of the circuit-breaker of embodiment 66;

Figure 149 is the profile along the F-F line of Figure 148;

Figure 150 is the electrode part end view of circuit-breaker of the variation of embodiment 66;

Figure 151 is the electrode end view partly of the circuit-breaker of embodiment 67;

Figure 152 is the profile along the G-G line of Figure 151;

Figure 153 is the electrode end view partly of the circuit-breaker of embodiment 67 variation;

Figure 154 is the plane graph of Figure 153;

Figure 155 is the electrode end view partly of the circuit-breaker of embodiment 68;

Figure 156 is the profile along the H-H line of Figure 155;

Figure 157 is the electrode part end view of circuit-breaker of the variation of embodiment 68;

Figure 158 is the plane graph of Figure 157;

Figure 159 is the plane graph of fixed contact of arc extinguishing side plate with other variation of embodiment 68;

Figure 160 is the plane graph of fixed contact of arc extinguishing side plate with another variation of embodiment 68;

Figure 161 (a) is the electrode part end view of circuit-breaker of the variation of embodiment 68;

Figure 161 (b) is the profile along the I of Figure 161 (a)-I line;

Figure 161 (c) is the plane graph of Figure 161 (a);

Figure 162 is the end view of the movable contact of the circuit-breaker of the embodiment of the invention 69 arc extinguishing part when being in closure state;

Figure 163 is the end view of the movable contact of the circuit-breaker of Figure 162 arc extinguishing part when being in off-state;

Figure 164 (a) is the oblique view of the fixed contact of Figure 162;

Figure 164 (b) is the oblique view that the fixed contact with Figure 164 (a) insulated;

Figure 165 is the action specification figure that the circuit-breaker of Figure 162 is in the firm after separating state in contact;

Figure 166 is the action specification figure that the movable contact of the circuit-breaker of Figure 162 reaches maximum off-state;

Figure 167 (a) is the figure for the magnetic field distribution of the electric current generation that the fixed contact that flows through Figure 163 is described;

Figure 167 (b) is the profile along the A-A line of Figure 167 (a);

Figure 167 (c) is on the Z axle of Figure 167 (b), flows through the curve chart of the magnetic field distribution that the electric current of fixed contact produces;

Figure 168 is the action specification figure of the circuit-breaker of the embodiment of the invention 72;

Figure 169 is the action specification figure of other circuit-breaker of the embodiment of the invention 72;

Figure 170 (a)～Figure 170 (h) is the oblique view of variation of the arc extinguishing board of the embodiment of the invention 72;

Figure 171 (a) and Figure 171 (b) are the oblique views of other arc extinguishing board of the embodiment of the invention 72;

Figure 172 is the end view of the circuit-breaker of the embodiment of the invention 73 arc extinguishing part when being in closure state;

Figure 173 is the end view that the circuit-breaker of Figure 172 is in off-state;

Figure 174 (a) is the plane graph of the fixed contact among Figure 172 and Figure 173;

Figure 174 (b) is the front elevation of Figure 174 (a);

Figure 175 is the plane graph of the magnetic sheet among Figure 173 and Figure 174;

Figure 176 is the oblique view of the fixed contact among Figure 173～Figure 175;

Figure 177 is that the end view of state has afterwards just been separated in the contact that is in that is used for the action specification of embodiment 73;

Figure 178 is the end view that Figure 177 reaches maximum off-state;

Figure 179 be among Figure 178 during nonmagnetic plate along the profile of A-A line;

Figure 180 is along the profile of A-A line when being magnetic plate among Figure 178;

Figure 181 is used for the magnetic sheet shown in the action specification of embodiment 73 and the oblique view of fixed contact;

Figure 182 is for the not plane graph of the action during magnetic saturation of magnetic sheet is described;

Figure 183 is the plane graph of the action when illustrating that magnetic sheet reaches magnetic saturation;

Figure 184 is the end view that disposes a plurality of magnetic sheets at the superjacent air space of the fixed contact of embodiment 73;

Figure 185 be among Figure 178 fixed contact along the profile of A-A line;

Figure 186 is on the Z of Figure 185 axle, flows through the curve chart of the magnetic field distribution that the electric current of fixed contact produces;

Figure 187 is the end view that the movable contact that is used for the action specification of embodiment 73 reaches maximum off-state;

Figure 188 (a)～Figure 188 (d) is respectively the plane graph of the variation of the different magnetic sheet of flat shape;

Figure 189 (a) is the plane graph of the magnetic sheet of other variation;

Figure 189 (b) is the end view of Figure 189 (a);

Figure 190 (a) is the end view of the magnetic sheet of another variation;

Figure 190 (b) is the end view of the magnetic sheet of another variation;

Figure 191 is the electrode part end view of circuit-breaker with other variation magnetic sheet of embodiment 73;

Figure 192 is the plane graph of fixed contact with magnetic sheet of the embodiment of the invention 74;

Figure 193 is the additional end view that is in the movable contact of off-state on Figure 192;

Figure 194 is the plane graph of fixed contact with magnetic sheet of the embodiment of the invention 75;

Figure 195 is the additional electrode end view partly that is in the circuit-breaker of off-state on Figure 194;

Figure 196 is the profile along the B-B line of Figure 195;

Figure 197 is the plane graph of fixed contact with magnetic sheet of the embodiment of the invention 76;

Figure 198 is the electrode end view partly that adds the circuit-breaker of the movable contact that is in off-state on Figure 197;

Figure 199 is the profile along the C-C line of Figure 198;

Figure 200 is the plane graph of fixed contact with magnetic sheet of the embodiment of the invention 77;

Figure 20 1 is the electrode end view partly that adds the circuit-breaker of the movable contact that is in off-state on Figure 200;

Figure 20 2 is the plane graphs of fixed contact with magnetic sheet of the embodiment of the invention 78;

The end view of the electrode part of circuit-breaker when Figure 20 3 is the big failures of current of the additional movable contact that is in off-state on Figure 20 2;

The end view of the electrode of circuit-breaker part when Figure 20 4 is little failures of current;

Figure 20 5 is the plane graphs of fixed contact with variation magnetic sheet of embodiment 78;

Figure 20 6 is the plane graphs of fixed contact with magnetic sheet of the embodiment of the invention 79;

Figure 20 7 is the electrode end views partly that add the circuit-breaker of the movable contact that is in off-state on Figure 20 6;

Figure 20 8 is the profiles along the D-D line of Figure 20 6;

Figure 20 9 is the plane graphs of fixed contact with magnetic sheet of the embodiment of the invention 80;

Figure 21 0 is the plane graph of fixed contact with magnetic sheet of the embodiment of the invention 81;

Figure 21 1 is the electrode end view partly that adds the circuit-breaker of the movable contact that is in off-state on Figure 21 0;

Figure 21 2 is the profiles along the E-E line of Figure 21 1;

Figure 21 3 is the plane graphs of fixed contact with magnetic sheet of the embodiment of the invention 82;

Figure 21 4 is the end views of electrode part of circuit-breaker with magnetic sheet of the embodiment of the invention 83;

Figure 21 5 is end views of electrode part of circuit-breaker of the variation of embodiment 83;

Figure 21 6(a) is the end view of electrode part of circuit-breaker of other variation of the foregoing description 83;

The profile of F-F line upper edge Figure 21 6(a Figure 21 6(b));

Figure 21 7 is end views that the connection of the fixed contact of circuit-breaker of the embodiment of the invention 84 and movable contact and magnetic sheet constitutes;

Figure 21 8 is that the movable contact among Figure 21 7 is in the end view in the disconnection process;

Figure 21 9(a) is the end view of the support portion intersection of movable contact and magnetic sheet;

Figure 21 9(b) be Figure 21 9(a) plane graph;

Figure 22 0 is the end view of electrode part of circuit-breaker with magnetic sheet of the embodiment of the invention 85;

Figure 21 1 is along the profile of G-G line behind the movable contact that omits among Figure 22 0;

Figure 22 2 is the profiles along the H-H line of Figure 22 0;

Figure 22 3 is end views of the closure state of circuit-breaker;

Figure 22 4 is end views of the off-state of circuit-breaker;

Figure 22 5(a) and Figure 22 5(b) be the oblique view of the fixed contact of circuit-breaker;

Figure 22 6 is action specification figure of circuit-breaker;

Figure 22 7(a)～227(c) be the key diagram that flows through the magnetic field distribution that the electric current of the fixed contact of circuit-breaker produces;

Figure 22 8 is action specification figure of circuit-breaker;

Figure 22 9 is side views of the formation of circuit-breaker;

Figure 23 0 is the oblique view of formation of fixed contact, insulant, the arc extinguishing board of circuit-breaker;

Figure 23 1(a)～and Figure 23 1(g) be the oblique view of the shape of expression arc extinguishing board;

Figure 23 2 is end views of the arc extinguishing part of circuit-breaker;

Figure 23 3 is oblique views of formation of fixed contact, insulant, the arc extinguishing board of circuit-breaker;

Figure 23 4 is oblique views of formation of fixed contact, insulant, the arc extinguishing board of circuit-breaker;

Figure 23 5 is end views of the arc extinguishing part of circuit-breaker;

Figure 23 6 is end views of the closure state of circuit-breaker;

Figure 23 7 is end views of the off-state of circuit-breaker;

Figure 23 8(a) and Figure 23 8(b) be the oblique view of the fixed contact of circuit-breaker;

Figure 23 9 is action specification figure of circuit-breaker;

Figure 24 0(a) and Figure 24 0(b) be the oblique view of arc extinguishing board;

Figure 24 1 is the end view of circuit-breaker;

Figure 24 2 is oblique views of the fixed contact of circuit-breaker;

Figure 24 3 is end views of the arc extinguishing part of circuit-breaker;

Figure 24 4 is end views of the closure state of circuit-breaker;

Figure 24 5 is end views of the off-state of circuit-breaker;

Figure 24 6 is oblique views of the fixed contact of circuit-breaker;

Figure 24 7 is action specification figure of circuit-breaker;

Figure 24 8 is action specification figure of circuit-breaker;

Figure 24 9(a) and Figure 24 9(b) be the end view and the vertical view of the formation of the fixed contact of circuit-breaker and electric arc impeller;

Figure 25 0 is the action specification figure of circuit-breaker;

Figure 25 1 is the end view of the formation of the fixed contact of circuit-breaker and electric arc guide plate;

Figure 25 2 is end views of the formation of the fixed contact of circuit-breaker and electric arc guide plate;

Figure 25 3(a) and Figure 25 3(b) be the end view of the formation of the fixed contact of circuit-breaker and electric arc guide plate;

Figure 25 4(a) and Figure 25 4(c) be the end view of the formation of the fixed contact of circuit-breaker and electric arc guide plate;

Figure 25 5(a) and Figure 25 5(b) be the oblique view and the vertical view of the formation of the fixed contact of circuit-breaker and electric arc guide plate;

Figure 25 6(a) and Figure 25 6(b) be the oblique view and the vertical view of the formation of the fixed contact of circuit-breaker and electric arc guide plate;

Figure 25 7(a) and Figure 25 7(b) be the end view and the vertical view of the formation of the fixed contact of circuit-breaker and electric arc guide plate;

Figure 25 8(a) and Figure 25 8(b) be the end view and the vertical view of the formation of the fixed contact of circuit-breaker and electric arc guide plate;

Figure 25 9 is end views of the arc extinguishing part of circuit-breaker;

Figure 26 0 is the end view of the closure state of circuit-breaker;

Figure 26 1 is the end view of the off-state of circuit-breaker;

Figure 26 2(a) and Figure 26 2(b) be the fixed contact of circuit-breaker and the oblique view of electric arc guide plate;

Figure 26 3(a)～and Figure 26 3(c) be the fixed contact of circuit-breaker and the oblique view of electric arc guide plate;

Figure 26 4 is action specification figure of circuit-breaker;

Figure 26 5 is end views of circuit-breaker;

Figure 26 6(a) and Figure 26 6(b) be the fixed contact of circuit-breaker and the oblique view of electric arc guide plate;

Figure 26 7 is end views of circuit-breaker;

Figure 26 8(a) and Figure 26 8(b) be the fixed contact of circuit-breaker and the oblique view of electric arc guide plate;

Figure 26 9(a)～and Figure 26 9(l) be the profile of the electric arc guide plate shape of indication circuit circuit breaker;

Figure 27 0 is the fixed contact of circuit-breaker and the vertical view of electric arc guide plate;

Figure 27 1 is the end view of circuit-breaker;

Figure 27 2 is end views of the closure state of circuit-breaker;

Figure 27 3 is end views of the off-state of circuit-breaker;

Figure 27 4(a) and Figure 27 4(b) be the fixed contact of circuit-breaker and the oblique view of electrode;

Figure 27 5 is action specification figure of circuit-breaker;

Figure 27 6 is end views of circuit-breaker;

Figure 27 7(a) and Figure 27 7(b) be the fixed contact of circuit-breaker and the oblique view and the end view of electrode;

Figure 27 8 is end views of circuit-breaker;

Figure 27 9(a) and Figure 27 9(b) be fixed contact and the electrode oblique view and the profile of circuit-breaker;

Figure 28 0 is the end view of circuit-breaker;

Figure 28 1(a) and Figure 28 1(b) be the fixed contact of circuit-breaker and the oblique view and the profile of electrode;

Figure 28 2 is end views of circuit-breaker;

Figure 28 3 is end views of the closure state of circuit-breaker;

Figure 28 4 is end views of the off-state of circuit-breaker;

Figure 28 5(a) and Figure 28 5(b) be the oblique view of the fixed contact of circuit-breaker;

Figure 28 6 is action specification figure of circuit-breaker;

Figure 28 7 is near profiles in contact of circuit-breaker;

Figure 28 8 is action specification figure of circuit-breaker;

Figure 28 9 is end views of circuit-breaker;

Figure 29 0 is the end view of circuit-breaker;

Figure 29 1(a) and Figure 29 1(b) be the end view and the vertical view of the arc extinguishing part of circuit-breaker;

Figure 29 2(a)～and Figure 29 2(d) be the oblique view of the arc extinguishing board of circuit-breaker;

Figure 29 3(a) and Figure 29 3(b) be the end view and the vertical view of the arc extinguishing part of circuit-breaker;

Figure 29 4(a) and Figure 29 4(b) be the end view and the vertical view of the arc extinguishing part of circuit-breaker;

Figure 29 5 is end views of circuit-breaker;

Figure 29 6 is a part of oblique views of the arc extinguishing part of circuit-breaker;

Figure 29 7 is near profiles in contact of circuit-breaker;

Figure 29 8 is oblique views of the arc extinguishing part of circuit-breaker;

Figure 29 9 is oblique views of the arc extinguishing part of circuit-breaker;

Figure 30 0 is the oblique view of the arc extinguishing part of circuit-breaker;

Figure 30 1 is the oblique view of the arc extinguishing part of circuit-breaker;

Figure 30 2 is end views of the arc extinguishing part of circuit-breaker;

Figure 30 3 is end views of the closure state of circuit-breaker;

Figure 30 4 is oblique views of the arc extinguishing board of circuit-breaker;

Figure 30 5 is near profiles in contact of circuit-breaker;

Figure 30 6 is end views of the off-state of circuit-breaker;

Figure 30 7(a) and Figure 30 7(b) be the oblique view of the fixed contact of circuit-breaker;

Figure 30 8 is action specification figure of circuit-breaker;

Figure 30 9 is action specification figure of circuit-breaker;

Figure 31 0 is near the profile in contact of circuit-breaker;

Figure 31 1 is the end view of circuit-breaker;

Figure 31 2 is the switches as embodiment 119, and the circuit-breaker that container is cut open is in the end view of the arc extinguishing board of closure state;

Figure 31 3 is end views of off-state of the circuit-breaker of Figure 31 2;

Figure 31 4 is plane graphs that the connection of repulsion contact among Figure 31 2 and the 1st conductor and the 2nd conductor constitutes;

Figure 31 5 is front elevations of Figure 31 4;

Figure 31 6 is oblique views of Figure 31 5;

Figure 31 7 is end views of the circuit-breaker that is used to illustrate the action of embodiment 119 electrode part when being in closure state;

Figure 31 8 is end views of the firm after separating electrode part in contact shown in the action specification when being used for the big failure of current of embodiment 119;

Figure 31 9 is the movable contacts among Figure 31 8 and repels the end view that contact reaches maximum off-state;

Figure 32 0 is the end view of the circuit-breaker of embodiment 120 electrode part when being in closure state;

Figure 32 1 is the end view of Figure 32 0 electrode part when becoming the contact off-state;

Figure 32 2 is end views of the circuit-breaker of embodiment 121 electrode part when being in closure state;

Figure 32 3 is end views of the circuit-breaker of embodiment 122 electrode part when being in closure state;

Figure 32 4 is arc extinguishing part end views of circuit-breaker of the variation of embodiment 122;

Figure 32 5 is end views of the circuit-breaker of embodiment 123 electrode part when being in off-state;

Figure 32 6 is end views of the circuit-breaker of embodiment 124 electrode part when being in off-state;

Figure 32 7 is end views of the circuit-breaker of embodiment 125 electrode part when being in off-state;

Figure 32 8 is end views of the repulsion contact of Figure 32 7 electrode part when being in off-state;

Figure 32 9 is that the circuit-breaker of the variation of embodiment 125 is the end view that movable contact becomes the electrode part of off-state when little failure of current;

Figure 33 0 movable contact that is Figure 32 9 when big failure of current and repel the end view that contact all is in off-state;

Figure 33 1 is the end view of the circuit-breaker of embodiment 126 electrode part when being in closure state;

Figure 33 2 is electrode part end views of the variation of embodiment 126;

Figure 33 3 is end views of the electrode part of embodiment 126 other variation;

Figure 33 4(a) is the end view of the circuit-breaker of embodiment 127 electrode part when being in closure state;

Figure 33 4(b) be along Figure 33 4(a) the profile of A-A line;

Figure 33 5 is electrode end views partly of the circuit-breaker of embodiment 128;

Figure 33 6 is profiles of Figure 33 5;

Figure 33 7(a) is the electrode end view partly of the circuit-breaker of embodiment 129;

Figure 33 7(b) be to omit Figure 33 7(a) movable contact and the profile of the electrode part of insulant;

Figure 33 8(a) be Figure 33 7(a) the end view of repulsion contact electrode part when being in off-state;

Figure 33 8(b) be Figure 33 8(a) profile;

Figure 33 9 is electrode part end views of other variation of circuit-breaker of the embodiment of the invention;

Figure 34 0 is the electrode part end view of other variation of circuit-breaker of the embodiment of the invention;

Figure 34 1 is the electrode plane graph partly of other variation of circuit-breaker of the embodiment of the invention;

Figure 34 2 is end views of Figure 34 1;

Figure 34 3 is bottom views of Figure 34 2;

Figure 34 4 is electrode part end views of other distortion of circuit-breaker of the embodiment of the invention;

Figure 34 5 is electrode part end views of another variation of the circuit-breaker of the embodiment of the invention;

Figure 34 6(a) is the electrode plane graph partly of the another different distortion example of circuit-breaker of the embodiment of the invention;

Figure 34 6(b) be along Figure 34 6(a) the profile of B-B line;

Figure 34 7 is electrode part end views of other variation of circuit-breaker of the embodiment of the invention;

Figure 34 8 is the plane graphs that omit the movable contact among Figure 34 7;

Figure 34 9 is electrode part end views of other variation of circuit-breaker of the embodiment of the invention;

Figure 35 0 omits the movable contact among Figure 34 9 and the front elevation of insulant;

Figure 35 1 is the end view of electrode part of another variation of the circuit-breaker of the embodiment of the invention;

Figure 35 2 is the front elevations that omit the insulant among Figure 35 1;

Figure 35 3 is end views of the repulsion contact of the circuit-breaker of the embodiment of the invention 130 electrode part when being in closure state;

Figure 35 4 is end views of the repulsion contact of Figure 35 3 electrode part when becoming off-state;

Figure 35 5 is electrode oblique views partly of other variation of circuit-breaker of the embodiment of the invention;

Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Embodiment 1:

Below, with reference to description of drawings embodiments of the invention 1.Figure 11 is the end view of arc extinguishing part when being in closure state as the circuit-breaker that the switch of the embodiment of the invention 1 is cut container open.Figure 12 is the end view that the circuit-breaker of Figure 11 becomes off-state, and the part identical or suitable with Fig. 1～Fig. 3 be marked with identical symbol, and the repetitive description thereof will be omitted.

Among the figure, 4 is fixed contacts that an end is provided with fixed contact 3, and this fixed contact 4 is made of the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d.

In more detail, be exactly under the contact closure condition of Figure 11, when the direction of separating from fixed contact 3 with the moving contact 2 of movable contact 1 is the top, said fixing contact 4 integrally forms the shape that is made of the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d, the joint 5 of the 1st conductor 4a and power end is connected, and extends to horizontal direction; The 2nd conductor 4e is positioned at the alternate certain distance in below of the 1st conductor 4a; The 3rd conductor 4d is connected the 2nd conductor 4e with the 1st conductor 4a along the vertical direction at a reciprocal end of above-mentioned joint 5, fixed contact 3 is fixed on above-mentioned the 2nd conductor 4e, and makes this fixed contact 3 be positioned at the below of the 1st conductor 4a.

Said fixing contact 4 is installed on the container 12, makes the 3rd conductor 4d be configured in than the other end of not establishing moving contact 2 of the more close movable contact 1 in the position of fixed contact 3 and is positioned at the reciprocal position (near the rotating fulcrum 14 of movable contact 1 on one side) of above-mentioned joint 5.At this moment, the 1st conductor 4a moving contact 2 all be positioned at during with the closing of contact that fixed contact 3 contacts this contact contact-making surface above, and, be positioned at when disconnecting in the contact moving contact 2 contact-making surface below.

Figure 11 and arc extinguishing board 6 shown in Figure 12 are provided with the otch (not shown) in order not hinder above-mentioned movable contact 1 to rotate, in Figure 11 and Figure 12, omitted the driving mechanism 8 in the circuit-breaker that has earlier shown in Figure 1 and the joint 10 of handle 9 and load end, these parts all install in container 12 certainly.

Figure 13 (a) and Figure 13 (b) are the oblique views of the fixed contact 4 of embodiment 1.

Fixed contact 4 shown in Figure 13 (a) is integrally formed by the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d and slightly is the U word shape, and the continue end of end of the joint 5 of power end and power supply as above-mentioned the 1st conductor 4a of an end of this U font is connected.In addition, fixed contact 3 be fixed on the inboard of the U font state of the end relative with it be above-mentioned the 2nd conductor 4e above.On said fixing contact 4,, on the conductor that continues above the stationary plane that is positioned at said fixing contact 3 (the 1st conductor 4a and the 3rd conductor 4d), be provided with slit 40 in order not hinder the switch motion of the fixed contact 3 on movable contact 1 relative the 2nd conductor 4e.

In Figure 13 (b), the 15th, insulant, this insulant 15 with in the inner surface of the surface of said fixing contact 4 and above-mentioned slit 40 from getting up to the whole coatings of the 3rd conductor 4d near the 1st conductor 4a and joint 5 junctions.

Below, its action is described.

When big electric current such as short circuit current flow, movable contact 1 does not wait for that the action of driving mechanism just rotates, and moving contact 2 and fixed contact 3 are separated, and is at this moment the same with situation about seeing earlier, and electric arc A takes place between contact 2,3.

Figure 14 is that the contact-making surface of moving contact 2 also is in the state of the below of the 1st conductor 4a after has just separated above-mentioned contact 2,3.Among the figure, arrow is represented electric current, for simplicity, has omitted arc extinguishing board.

From the current path that joint 5 to the 1st conductor 4a constitute, all be positioned at the top of electric arc A.As a result, this current path becomes the active force that electric arc A is elongated to joint 5 directions to the electromagnetic force of the electric arc A effect of generation.In addition, owing to flow through the current opposite in direction of electric current and the electric arc A of the 3rd conductor 4d, so the electromagnetic force that flows through the electric current generation of the 3rd conductor 4d also becomes the active force that electric arc A is elongated to joint 5 directions.

Therefore, flowing through the electromagnetic force that the electric current of fixed contact 4 produces all is the active force that electric arc A is elongated to joint 5 directions.As a result, the electric arc A after has just separated the contact is elongated consumingly, so arc resistance increases sharp.

Figure 15 (a) is used to illustrate the movable contact 1 shown in the magnetic field distribution that the electric current of the fixed contact 4 that flows through embodiment 1 produces and the end view of fixed contact 4, and Figure 15 (b) is the profile along the A-A line of Figure 15 (a).Among the figure, the 41st, the center of each section of the 1st conductor 4a of slit 40 left and right sides.

Figure 15 (c) is created in magnetic field distribution on the Z axle of Figure 15 (b) by the electric current that flows through fixed contact 4 that Theoretical Calculation is obtained, and the magnetic field of positive direction is the magnetic-field component that electric arc A is elongated to joint 5 directions.

Shown in Figure 15 (c) like that, the 1st conductor 4a is positioned at the position, the left and right sides of the rotational plane that departs from movable contact 1.

In such conductor arrangement, owing to flow through the influence of the electric current of the 2nd conductor 4e and the 3rd conductor 4d, there is the magnetic-field component that electric arc A is elongated to joint 5 directions at the upper space (regional ZO) of the 1st conductor 4a.So, as shown in figure 16, even moving contact 2 turns to the top of the 1st conductor 4a, slit 40 parts at the 1st conductor 4a, electric arc A also is subjected to the active force to joint 5 direction drawings, is extruded on the insulant 15a that covers above-mentioned slit 40 tops (slit 40 is near joint 5 end inner surface on one side) part to be cooled.As a result, the arc resistance that sharply rises after just separate the contact further increases, and keeps high arc voltage, so, current peak and the energy that passes through can be suppressed little, thereby can obtain having the circuit-breaker of excellent current limiting performance.

In the foregoing description 1, the shape of the fixed contact 4 that is symmetrical set for the plane of rotation relative to above-mentioned movable contact 1 has illustrated in order not hinder the slit that rotates 40 of movable contact 1, but, this fixed contact 4 is made the such shape and structure shown in Figure 17 (a) and Figure 17 (b), also can obtain same effect.

Embodiment 2:

Figure 17 (a) is the oblique view of the fixed contact of embodiment 2, and Figure 17 (b) is the oblique view that the fixed contact with Figure 17 (a) insulated.

The fixed contact 4 of this embodiment 2 shown in Figure 17 (a) like that, the 1st conductor 4a only is configured in the reciprocal left side of joint 5.

For this fixed contact 4, shown in Figure 18 (a) like that, at the initial stage that movable contact 1 disconnects, the first half at electric arc A, the sense of current of the electric current of this electric arc A and the 1st conductor 4a in above-mentioned left side is identical, so electric arc A attracted on the 1st conductor 4a in above-mentioned left side, and after contacting consumingly, the insulant 15 that covers the 1st conductor 4a is cooled.Therefore, at the initial stage of above-mentioned disconnection, arc voltage promptly rises.

On the other hand, after separate contact 2,3, moving contact 2 rotate in place when the top of the 1st conductor 4a, shown in Figure 18 (b), the latter half at electric arc A, the current opposite in direction of the 1st conductor 4a in arc current and above-mentioned left side, mutually exclusive, so, electric arc A is away from the insulant 15 of the 1st conductor 4a that covers above-mentioned left side, so the vapor volume that takes place from this insulant 15 reduces, therefore can reduce in the container 12 follow electric current to increase and the pressure that causes rises, thereby can prevent the damage of the container 12 that pressure causes.

That is to say that as above-mentioned embodiment 2, when the 1st conductor 4a of fixed contact 4 being configured in the left side of plane of rotation of movable contact 1 or the right, it is good and be difficult to take place the fixed contact 4 that pressure causes container 12 damages to get current limiting performance.

Embodiment 3:

Figure 19 is the end view of the major part of embodiment 3.In this embodiment 3, the joint 5 of power end is configured in the top of the 1st conductor 4a.Like this, when making joint 5 be positioned at the top of the 1st conductor 4a, a part that attracted to the electric current of the electric arc A the joint 5 near just attracts each other with the electric current of joint 5, so, before electric arc A is elongated to cut-out, can effectively electric arc A be attracted, elongate.

Like this, can utilize electromagnetic force that the arc length before cutting off is increased, so, in than higher potential circuit, the electromagnetic force that the cut-out action of smaller electric current etc. produce to the stretching action of the electric arc before cutting off, can apply material impact to cutting off performance effectively.

Embodiment 4:

Figure 20 is the end view of the major part of embodiment 4.The fixed contact 4 of present embodiment 4 is configured in the below of the 1st conductor 4a with joint 5, and is positioned at the top on the surface of fixed contact 3.

Like this, when making the joint 5 of fixed contact 4 be positioned at the below of the 1st conductor 4a, the electric arc of fixed contact 4 just produces the electric current composition that direction makes progress in the part of joint 5, this electric current composition and electric arc A attract each other, so, near the electric current composition that this direction makes progress, can replenish the electric arc A that is elongated after separate contact 2,3 to a certain extent.Therefore, in the way that cuts off action, can prevent that electric arc A is pulled back between the contact 2,3, thereby can keep high arc voltage.

In addition, as mentioned above, by the joint 5 that is positioned at the 1st conductor 4a below being configured in the top on the surface of fixed contact 3, the electric current of joint 5 will produce the magnetic-field component of electric arc A on the surface of stretching fixed contact 3, so, can improve arc voltage rapidly.

Embodiment 5:

Figure 21 is the end view of the major part of embodiment 5.

The joint 5 of the fixed contact 4 of present embodiment 5 is configured in the below on the surface that is positioned at the 1st conductor 4a and fixed contact 3, and it is identical with the situation of the foregoing description 4 that joint 5 is positioned at the action effect that the below of the 1st conductor 4a produces.

In addition, as in this embodiment 5, by joint 5 further being configured in the below on the surface of fixed contact 3, can increase the electric current composition that the direction of replenishing above-mentioned electric arc makes progress, increase supplementary result, thereby, can keep higher arc voltage in the latter half of cutting off action.Therefore, can shorten the desired time of failure of current, thereby can reduce owing to cut off action at inner gross energy that takes place of circuit breaker and the energy that passes through.

Embodiment 6:

Figure 22 and Figure 23 are the end views of the major part of embodiment 6.The fixed contact 4 of present embodiment 6 integrally forms the 1st conductor 4a of fixed contact 3 and the lobed zigzag part relative with it.In addition, the tortuous angle of the zigzag part of the 1st conductor 4a is different among Figure 22 and Figure 23.

For this fixed contact 4, though the supplementary result of the electric current composition that above-mentioned direction makes progress reduced,, in the initial stage of contact separation current ratio hour, can be effectively will be able to elongate near the part of the electric arc A of contact 2, so, the arc voltage at initial stage can be improved rapidly.

In addition, the zigzag part of above-mentioned the 1st conductor 4a forms the obtuse angle, so, the tortuous handling ease of said fixing contact 4.

When the position of joint 5 is subjected to the restriction of the annexation of external circuit, as Figure 20～shown in Figure 23, the 1st conductor 4a can be configured in the top of joint 5, like this, the length of the 3rd conductor 4d is increased, thereby the repulsive interaction of the electric current that the electric current that is directed downwards of the 3rd conductor 4d and the direction of electric arc A make progress increases, and promotes the elongation of electric arc A.

Embodiment 7:

Figure 24 is the end view of the major part of embodiment 7.In present embodiment 7, the 2nd conductor 4e of the fixed contact 3 of fixing fixed contact 4 in the foregoing description 1, be arranged to the 2nd conductor 4e is prolonged to center of rotation 14 directions of movable contact 1, thereby make the electric current that flows through movable contact 1 when flowing through the 2nd conductor 4e electric current partly substantially parallel oppositely with closure.

When adopting this structure, what the electric current of the 2nd conductor 4e produced increases electric arc A to the electromagnetic force that joint 5 directions stretch, and, between movable contact 1 and the 2nd conductor 4e, act on electromagnetic repulsive force when closed, the velocity of rotation of movable contact 1 is increased, thereby the arc length after can very fast the contact just having been separated elongate.Therefore, the very fast increase of arc resistance further improves current limiting performance.

Embodiment 8:

Figure 25 is the end view of the major part of embodiment 8.Position that the 1st conductor 4a of the fixed contact 4 of present embodiment 8 is connected with the 3rd conductor 4d forms the inclined-plane, so, can increase the magnetic field intensity of electric arc A on the surface of stretching fixed contact 3.

Below, further describe said structure.

For ideal situation, for the magnetic field intensity of the electric arc that makes the stretching fixed contact 3 centre of surface points that fixed contact 4 produces is maximum, should be on the barrel surface vertical with the plane of rotation of movable contact 1 the conductor arrangement of fixed contact 4, this barrel surface is the center with the central point on fixed contact 3 surfaces, and has the magnetic field intensity that makes stretching electric arc A and be maximum radius.But above-mentioned radius is different and different with the conductor shape of fixed contact 4.

For example, as shown in Figure 13, when relatively the configuration of the plane of rotation of movable contact 1 was provided with symmetrical the 1st conductor 4a of slit 40,1/2nd of left and right sides distance between conductors was above-mentioned radius value.

But, in fact, perhaps be difficult to along this barrel surface configuration conductor, perhaps cost is very high.

Therefore, this just requires approaching as far as possible above-mentioned desirable barrel surface and processes simple conductor shape.

As above-mentioned embodiment 1, bend is few more, and the processing of fixed contact 4 is simple more, and still, the part that the conductor of fixed contact 4 departs from above-mentioned ideal cylinder position increases.

Therefore, as shown in Figure 25, by increase bend on the 1st conductor 4a, minimizing departs from above-mentioned ideal cylinder, can increase the magnetic field intensity of stretching fixed contact 3 lip-deep electric arcs, simultaneously, also can be restricted to Min. to the processing cost that improves.

Embodiment 9:

Figure 26 is the end view of the major part of embodiment 9.The fixed contact 4 of present embodiment 9 is connected the 1st conductor 4a by the bend △ 1 at obtuse angle with the 3rd conductor 4d, simultaneously, bend △ 2 by acute angle is connected the 3rd conductor 4d with the 2nd conductor 4e, above-mentioned obtuse angle and above-mentioned acute angle make the 3rd conductor 4d form the inclined-plane to the direction projection opposite with fixed contact 3.

According to present embodiment 9, can not increase the quantity of above-mentioned bend, and reduce and the departing from of above-mentioned ideal cylinder than the situation of embodiment 1.

But, for the big circuit-breaker of powered-on capacity, because the increase of the cross-sectional area of conductor of fixed contact 4, so, be difficult to the such minor radius of image pattern 25 and Figure 26 and carry out bending machining.

Embodiment 10:

Figure 27 is the end view of the major part of embodiment 10.The fixed contact 4 of present embodiment 10 is formed on the curve that the direction opposite with fixed contact 3 be convex with the 3rd conductor 4d and forms.

Like this, even the cross-sectional area of conductor of fixed contact 4 is bigger, also can must be near the ideal conductor shape conductor arrangement, so, can improve arc voltage rapidly.

Embodiment 11:

Figure 28 (a) be embodiment 11 be in the contact just separated after the end view of major part of state, Figure 28 (b) is the end view of Figure 28 (a) major part when becoming maximum off-state.

The fixed contact 4 of present embodiment 11 is provided with on the 1st conductor 4a to the protruding on one side protuberance 4ax of fixed contact 4, and the summit of this protuberance 4ax than fixed contact 3 near joints 5 on one side.

According to this configuration, at the initial stage that contact separation is opened, shown in Figure 28 (a) like that, the electric current composition that flows to the oblique upper of above-mentioned protuberance 4ax attracts electric arc A, very fast electric arc A is elongated, so, can improve arc voltage rapidly.

In addition, shown in Figure 28 (b) like that, when further separate contact 2,3, when arc length increased, electric arc A elongated to joint 5 directions from the summit of the above-mentioned protuberance 4ax of the 1st conductor 4a.At this moment, the electric current composition that flows to the oblique below of above-mentioned protuberance 4ax is opposite with the arc current direction, repel mutually, so, stop the direction of 2,3 of electric arc A to fall back, thereby can keep high arc voltage to the contact.

Embodiment 12:

Figure 29 is the end view of the major part of embodiment 12.The fixed contact 4 of present embodiment 12 disposes the end that the 2nd conductor 4e is fixing fixed contact 3 lower than the other end, and the contact-making surface of fixed contact 3 departs from the line vertical with above-below direction, points to joint 5 directions.

When adopting this structure, can make the emission direction of the electric arc A on the fixed contact 3 point to joint 5.

Usually, when the electric current of electric arc A increased, electric arc increased from the active force of contact face ejection, and the drawing effect in magnetic field relatively reduces.So, cutting off the less zone of action initial stage current ratio, the electric arc that is stretched by magnetic field is also retracted by direction between the contact when electric current increases, so, cause arc voltage to reduce sometimes.

Therefore, as shown in Figure 29, if make the emission direction of electric arc point to joint 5, even then the ejection active force of electric arc A increases, electric arc A can not fall back to 2,3 of contacts yet, thereby can pilot arc voltage.

Embodiment 13:

Figure 30 is the end view of the major part of embodiment 13.The fixed contact 4 of present embodiment 13 is configured in the conductor position of fixing fixed contact 3 of the 2nd conductor 4e the top of the connecting portion of the 2nd conductor 4e and the 3rd conductor 4d.

When adopting such structure, the current path of the 3rd conductor 4d increases, and the electric current that flows through this current path increases the active force that electric arc A repels to joint 5 directions.In addition, the 2nd conductor 4e goes up near the 3rd conductor 4d conductor position on one side far away apart from electric arc than fixed contact 3.So, even arc diameter increases along with the increase of arc current, electric arc also is difficult to expand to mechanism (usually on one side, mechanism is configured in center of rotation 14 1 sides of movable contact 1), so just, can prevent hot-fluid and follow the fused mass of hot-fluid to flow in the mechanism, so, after cutting off action, can not hinder switch motion.

At the foregoing description 13(Figure 30) in container is not shown, still, by the conductor position of fixing fixed contact 3 is carried upward, can be between above-mentioned conductor position and container slot milling.

When not having this space, the pressure that the electric arc A that repels on one side to joint 5 from fixed contact 3 produces is reflected at contiguous container position, so the circular arc that electric arc is squeezed into is difficult to surpass joint 5.

Therefore, by with the container portions displacement of above-mentioned vicinity at a distance, can suppress the reflection of above-mentioned arc pressure, thereby can take place easily electric arc A to joint 5 air-flow of extruding on one side.

Embodiment 14:

Figure 31 is the end view of the major part of embodiment 14.The fixed contact 4 of present embodiment 14 forms acute angle with the junction of the 2nd conductor 4e and the 3rd conductor 4d, on the 2nd conductor 4e bend is not set, utilizes such structure, can obtain the effect same with the foregoing description 13.

Embodiment 15:

Figure 32 is the end view of the major part of embodiment 15.The fixed contact 4 of present embodiment 15 forms tilted shape with the 3rd conductor 4d, makes the upper section of the 3rd conductor 4d than center of rotation 14 one side of close the movable contact 1 of below part.

When adopting such structure, the initial stage of opening from contact separation in the contact circuit action long period of latter half, the part of movable contact 1 is in the space that is surrounded by the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d, in the above-mentioned long time, movable contact 1 is subjected to flowing through magnetic field that the electric current of fixed contact 4 produces disconnects power from directive effect to the contact.Therefore, not only at the initial stage that contact separation is opened, even move to after the top of the 1st conductor 4a when moving contact 2, the opening speed of movable contact 1 can not reduce yet, so, can accelerate to reach time of maximum break distance.

Usually, supply voltage than higher voltage (for example 550V) circuit in, in the cut-out action in smaller short circuit current zone, the electromagnetic repulsive force that acts on the movable contact 1 is little, even before failure of current, the separating distance between the contact is also very little, so, with the insulation breakdown between the contact, make the cut-out baulk sometimes.

Therefore, as above-mentioned Figure 32,, can prevent the failure that above-mentioned cut-out is moved by adopting the structure of the time accelerate to reach contact maximum break distance.

Embodiment 16:

Figure 33 is a vertical view of seeing the 2nd conductor of embodiment 16 from the top, as shown in the figure, to fix the reduced width of one section conductor of fixed contact 3 on the 2nd conductor 4e, like this, the electric current that flows through the 2nd conductor 4e is just concentrated to fixed contact 3 along the center line of this section conductor as far as possible on one side.

Like this, behind current concentration, just can increase the magnetic-field component of electric current stretching electric arc A fixed contact 3 that flows through the 2nd conductor 4e near.In addition, and flow through that the electromagnetic repulsive force between the electric current also increases in the conductor of movable contact 1, so, the opening speed of movable contact 1 can be improved.

Utilize such effect, can improve arc voltage rapidly, thereby improve current limiting performance.In addition, common increase along with arc current, arc diameter increases simultaneously, still, if image pattern 33 is such, the reduced width of one section conductor of fixed contact 3 will fixed, the diameter that just can suppress electric arc increases, and improves arc current density, so, after arc resistance increases, can keep high arc voltage.

Embodiment 17:

Figure 34 (a) sees the movable contact 1 of embodiment 17 and the vertical view of fixed contact 4 from the top, Figure 34 (b) is the end view of Figure 34 (a).

In present embodiment 17, in order not hinder the switch motion of movable contact 1, on fixed contact 4, be provided with slit 40, and, the conductor 4a of these slit 40 the right and lefts, 4a is parallel to each other basically.

Embodiment 18:

Figure 35 sees the movable contact 1 of embodiment 18 and the vertical view of fixed contact 4 from the top.In present embodiment 18, Yi Bian the width of the slit 40 of fixed contact 4 is reduced to the center of rotation 14 of movable contact 1 on one side gradually from joint 5.

By slit 40 is formed such shape, hot-fluid flows to center of rotation 14 directions in the time of can preventing to cut off action.

Usually, there is the driving mechanism that makes movable contact 1 carry out switch motion,, will becomes and cut off the reason that switch motion can not drop into action afterwards again because above-mentioned hot-fluid is attached on this driving mechanism fused mass on center of rotation 14 one side of movable contact 1.In addition, because above-mentioned hot-fluid, after center of rotation 14 conductor position on one side produces electric arc, arc voltage will reduce sharp, circuit can not be disconnected sometimes from the moving contact 2 of movable contact 1.

Therefore, as shown in Figure 35, the width of the slit 40 of center of rotation 14 1 sides by making movable contact 1 can prevent above-mentioned hot-fluid, thereby can realize the cut-out performance that reliability is high less than the slit width of joint 5 one sides.

Embodiment 19:

Figure 36 is the plane graph of the major part of embodiment 19.In present embodiment 19, opposite with the situation of Figure 35, make the width of the slit 40 of fixed contact 4, center of rotation 14 1 sides of movable contact 1 are greater than joint 5 one sides.The width of above-mentioned slit 40 is narrow more, and electric arc touches after the insulant 15, and the effect of cooling is big more.In addition, after the electric current that passes through increases, when the electric arc cross section increases, utilize the width of slit 40 can limit the electric arc cross section, thereby can further improve arc voltage.

But in fact, movable contact 1 can swing in the way of switch motion, so, be difficult to make slit width less than the slit width of having considered this swing width.

Therefore, as shown in Figure 36, slit width by making fixed contact about 4 is greater than above-mentioned swing width, and the slit width of fixed contact 4 top connections 5 one sides is narrowed down, can obtain certain switch motion, and by the electric arc of insulant 15 coolings to the elongation of joint 5 directions, simultaneously, the electric arc cross section can be limited, thereby good current limiting performance can be realized.In addition, as mentioned above, if the width that makes slit is narrow more by the inside more, then the method to the inner surface coating insulant 15 of slit 40 is simple.

Embodiment 20:

Figure 37 is the side view of the movable contact 1 of embodiment 20.But the shape of the movable contact 1 of present embodiment 20 makes the position 1b of the moving-conductor 1a of 14 1 sides from moving contact 2 to center of rotation retreat into the top of the stationary plane of moving contact 2.

Usually, the electric current during along with the cut-out action increases, and the area of electric arc spot increases, thereby the cross section of electric arc increases.At this moment, if but image pattern 37 does not make the position 1b of above-mentioned moving-conductor 1a retreat into when top like that, but moving contact 2 and position 1c from the moving contact 2 of moving-conductor 1a to joint 5 one sides, do not remove the electric arc spot of expansion, but expand to the position 1b of center of rotation 14 1 side moving-conductor 1a from moving contact 2, so, but above-mentioned moving-conductor 1a is attenuated by thawing, mechanical strength is reduced, become the reason of heating when cutting off the energising of action back simultaneously.And, but the part of the moving-conductor of moving contact 2 one sides can come off when the worst, causes and can not come into operation again.In addition, usually, but moving-conductor 1a makes with copper or copper alloy, melt easily than moving contact 2, so, but when electric arc expands to the position 1b of above-mentioned moving-conductor 1a, but can produce a large amount of metal vaporss than moving contact 2 from the position 1b of above-mentioned moving-conductor 1a.Therefore, before failure of current, but near the insulation recovery the position 1b of above-mentioned moving-conductor 1a is slow, sometimes even can not cut off circuit.

In order to address this problem, but but can adopt with insulant cover above-mentioned moving- conductor 1a position 1b method and make the method for the position 1b of above-mentioned moving-conductor 1a away from electric arc.

Embodiment 21:

Figure 38 (a) is the plane graph of the major part of embodiment 21, and Figure 38 (b) is the side view of Figure 38 (a).

Shown in Figure 38 (a) like that, when being installed in insulant 21 on the movable contact 1, just the width of movable contact 1 increase, so, should expand the width of slit 40 among the figure position shown in the dotted line.So the cross section of the conductor of slit 40 the right and lefts will reduce, thereby can not obtain the performance of switching on fully.

Based on this reason, but being difficult to adopt when covering the method for position 1b of above-mentioned moving-conductor 1a with insulant, is effective but adopt the position 1b that makes moving-conductor 1a shown in Figure 37 away from the shape of the movable contact 1 of electric arc.

In addition, when using the fixed contact 4 of Figure 38 (a),, but can roughly be restricted to moving contact 2 and area to the electric arc spot of expansion from the moving contact 2 of moving-conductor 1a to the position 1c of joint 5 one sides along with the increase of electric current, so, arc voltage can be improved.

And then, when but the position 1b that makes above-mentioned moving-conductor 1a retreats into the top, shown in Figure 38 (b) like that, but increasing between end 42 that can make slit 40 after the firm generation electric arc and the moving-conductor 1a, thereby but can prevent to follow end 42 of above-mentioned slit 40 and the arc voltage reduction that the insulation breakdown between the moving-conductor 1a causes apart from d.

Embodiment 22:

Figure 39 (a) is the end view of the movable contact 1 of embodiment 22, and Figure 39 (b) is the profile along the B-B line of Figure 39 (a).But the movable contact 1 of present embodiment makes the width of the width of moving-conductor 1a less than moving contact 2.

According to present embodiment 22, when the cut-out action of short circuit current, movable contact 1 is subjected to disconnecting the big electromagnetic force that direction is quickened.

Usually, accelerate to and stop operating after high-speed movable contact 1 is run into the brake that is arranged on the container.At this moment, movable contact 1 is subjected to impulsive force, so when mechanical strength is not enough, but moving-conductor 1a can deform sometimes.

In order to improve the mechanical strength of movable contact 1, but the cross section that can increase moving-conductor 1a, still, if but increase the width of moving-conductor 1a, then the width of slit 40 also must increase, thereby current limiting performance is reduced.

Therefore, as Figure 39 (b), but can think and adopt the width of the width of the left and right directions make moving-conductor 1a less than moving contact 2 left and right directions, but and the width of the above-below direction of utilization moving-conductor 1a guarantee the to switch on shape of movable contact 1 of needed sectional area and enough mechanical strength be desired shapes very.

Usually, moving contact 2 utilizes the soldering fixed processing, still, if adopt the shape of above-mentioned movable contact 1, comes off just can prevent moving contact 2.

In addition, the front was said, the width of slit 40 is more little, and the steam of the insulant of slit 40 can improve current limiting performance to the cooling effect of electric arc and big more to the restriction in electric arc cross section, but, follow the increase of above-mentioned electric arc cooling effect, will produce a large amount of steams, so, pressure in the container will increase, and damage container sometimes.Therefore, when the powered-on capacity of the conductor of slit 40 the right and lefts has surplus, consider to add the width of wide slot 40, with the pressure that reduces to take place.

If add the width of wide slot 40, current limiting performance will reduce, and still, by apply insulant around moving contact 2, with movable contact 1 restriction electric arc cross section, then can remedy the decline of above-mentioned current limiting performance.

Like this, around moving contact 2 when disposing insulant, if adopt Figure 39 (b) but such width less than the moving-conductor 1a of the width of moving contact 2, limit the width increase of movable contact 1 smaller, just configurable insulant.

In the embodiment of above-mentioned Figure 13, slit 40 is located at the position of the substantial middle of fixed contact 4, the 1st conductor 4a and the 3rd conductor 4d are configured in the right and left.

Below, the general characteristic in the magnetic field that this electric current that flows through above-mentioned current path when having two current paths substantially parallel produces is described.

Figure 40 (a) is the sketch in order to the magnetic signature of two current paths generations of the plane of rotation left and right sides of explanation movable contact.In Figure 40 (a), the ZX face is equivalent to contain the plane of the track of movable contact, joint is positioned at the positive direction of X-axis, the center of rotation of movable contact is positioned at the negative direction of X-axis, movable contact is positioned at the positive direction of Z axle, the left and right sides conductor 43a of fixed contact, the center line of the current path of 43b is positioned on the XY plane, be parallel to each other, distance is 2a, above-mentioned left and right sides conductor 43a, the relative ZX of 43b plane is symmetrical, if flow through the electric current I 1 of this left and right sides conductor, I 2 flows to-directions X, equal and opposite in direction, and then the effect of the component during the Y-axis positive direction stretches electric arc to joint direction (positive direction of X-axis).At this moment, establish connect an a order on initial point O and the Y-axis straight line with on the connection Y-axis-a point and Z axle on angle between the straight line of any 1 PO be θ, then the variation of the PO point Y of place direction magnetic field B y can be expressed as

By＝（μⅠ/4πa）sin（2θ）

Wherein, the scope of θ is-90 °＜θ＜90 °, and μ is a magnetic permeability, electric current I=I 1+ I 2.

Figure 40 (b) is the curve chart of the relation of the angle θ that obtains according to following formula and Y direction magnetic field B y.In addition, Figure 40 (c) is transformed to the transverse axis of Figure 40 (b) in the figure of the length on the Z axle according to the relational expression of z=atg θ.

By Figure 40 (c) as can be known, in the zone of a＜z, along with the rate of change of the increase Y direction magnetic field B y of z value, on average.Less than the z value is the zone of 0≤z≤a.For example, Y direction magnetic field B y equals 80% numerical value of peak value, is a/z in the zone of 0≤z≤a, is 2a in the zone of a＜z.

The position relational application that PO on parallel conductor on the above-mentioned XY plane and the Z axle is ordered is Figure 41 in the embodiment of reality.

Embodiment 23:

Figure 41 (a) is the end view of the fixed contact of embodiment 23, and Figure 41 (b) is the profile along the C-C line of Figure 41 (a).In present embodiment 23, the section of establishing above-mentioned C-C line is the YZ plane, P1, P2 be about the center of each section of the 1st conductor 4a, the PO point is fixed contact 3 lip-deep centers.

Fixed contact 4 is constituted angle θ greater than 45 ° (during a≤PO(z), the Y direction magnetic field B y that flows through the electric current generation of slit 40 the right and left conductors is that peaked some Pmax is positioned on the Z axle of fixed contact 3 surfaces, and the Y direction magnetic field B y that the electric current of above-mentioned left and right sides conductor produces is not too big in the difference of the size of fixedly touching 3 surfaces and peak value.

That is to say, by making above-mentioned angle θ, can increase on the fixed contact surface and near the active force of space stretching electric arc its top, thereby can improve the rising of arc voltage greater than 45 ° (a≤PO(z)).

But if make angle θ greater than 45 ° (a≤PO(z)), then stronger Y direction magnetic field B y is also to the current path generation effect of the 2nd conductor, the electromagnetic force that the conductor that constitutes above-mentioned current path is directed downwards.In addition, because the 1st conductor is near the current path of the 2nd conductor, so the reaction force as to the electromagnetic force of the current path effect of above-mentioned the 2nd conductor is subjected to the electromagnetic force that direction is pointed to oblique upper.

Therefore, when the restriction that is subjected to aspects such as overall dimension, material cost, process technology, when fixed contact does not have enough mechanical strengths, because the effect of above-mentioned electromagnetic force, deformation will take place in fixed contact.

Therefore, in the time obtaining cutting off the magnetic field effect of the minimum needed stretching electric arc of electric current, by making above-mentioned angle θ 1, θ 2 less than 45 ° (0＜PO(z)＜a), adjust Y direction magnetic field to above-mentioned current path effect, can prevent above-mentioned deformation.

In the embodiment 1 of Figure 11, on the 3rd conductor 4d, also be provided with slit 40, for the conductor about the slit of the 3rd conductor 4d, can obtain the identical magnetic signature of conductor about the slit with the 1st conductor 4a.

Figure 42 is the vertical view of a part of seeing the fixed contact of embodiment 23 from the top, the straight line of getting center of gravity P1, the P2 of the slit left and right sides conductor section that connects the 3rd conductor 4d is a Y-axis, make with the Y-axis that to be the center rotate-90 ° the center point P O of Z1 axle by fixed contact 3 surfaces with the Z axle, decide x1, y1, z1 coordinate with this.At this moment, the relation of Y direction magnetic field B y and z among Figure 40 (c), Y direction magnetic field and z1 that the electric current about the slit of the 3rd conductor 4d is produced also set up.

In Figure 42, if make above-mentioned angle θ 1 greater than 45 ° (a1≤PO(z)), the peak value of the Y direction magnetic field B y that the electric current of then above-mentioned slit 40 left and right sides conductors produces is positioned at than the side of fixed contact 3 near the 3rd conductor 4d, and also difference is not too big at fixed contact 3 lip-deep sizes and peak value for the Y direction magnetic field B y that the electric current of above-mentioned left and right sides conductor produces.

In addition, even y1, the z1 plane of x1, y1, z1 coordinate are moved in the scope of the 3rd conductor 4d length along the x1 direction, also can obtain same relation.

Because above-mentioned reason, when making angle θ 1 greater than 45 ° (a≤PO(z)), can increase that fixed contact 3 surfaces are gone up and the top near the space to the stretching action power of electric arc, thereby can improve the rising of arc voltage.

Because the peak value of above-mentioned Y direction magnetic field intensity By is positioned at than center of rotation one side of fixed contact 3 near movable contact,, flow on one side to mechanism thereby can reduce hot-fluid so electric arc is difficult to expand to mechanism on one side.

In addition, (conductor extension of the 2nd conductor 4e is to than fixed contact 3 during near a side of joints 5 when near a side of joints 5 the electric arc guide plate being set than fixed contact 3, being considered as the electric arc impeller near the position of the 2nd conductor of joint one side) than fixed contact, the electric arc spot is driven from the electric arc guide plate direction of fixed contact 3 to joint 5 one sides, but, even the electric arc spot moves on the electric arc guide plate, above-mentioned Y direction magnetic field B y also reduces not too big, so, can fast driving electric arc, simultaneously, at the front end of electric arc guide plate, can effectively electric arc be elongated.

Like this, by electric arc being moved to the electric arc that stretches on the electric arc guide plate, can reduce the consumption of fixed contact.

But,, preferably make angle θ less than 45 ° (0＜PO(z)＜a1) if during the cut-out performance when considering to exist above-mentioned electric arc guide plate.

Usually, cut off the front end that electric arc before the electric current is positioned at the electric arc guide plate, how to utilize the stretch electric arc of this position of electromagnetic force, significant effects is arranged cutting off performance.

Particularly, circuit voltage than the higher and current value ratio that cuts off action hour, before cutting off, must be with the electromagnetic force electric arc that stretches.Therefore, by making angle θ 1 less than 45 ° (0＜PO(z)＜a1), so that the Y direction magnetic field B y that the electric current of slit 40 left and right sides conductors of the 3rd conductor 4d produces is a maximum, under above-mentioned cut-out condition, also can improve the cut-out performance near electric arc guide plate front end.

Embodiment 24:

Figure 43 is the oblique view of the fixed contact of embodiment 24.In the present embodiment, slit 40 is located at the 1st conductor 4a and the 3rd conductor 4d, and is positioned at the top of the connecting portion of the 2nd conductor 4e and the 3rd conductor 4d.Like this, as the embodiment of Figure 30, Figure 31, the 3rd conductor 4d is increased, thereby can increase the power that electric arc is stretched to joint 5 on one side.

Figure 44 (a) is the end view of the fixed contact of Figure 43, and Figure 44 (b) is the profile along the C1-C1 line of Figure 44 (a).Figure 44 (c) is the profile along the C2-C2 line of Figure 44 (a).In the fixed contact 4 of present embodiment, dispose to such an extent that make angle θ and θ 1 be slightly less than 45 ° by center point P O with fixed contact 3 surfaces, can further increase the magnetic-field component that the Y direction is gone up on fixed contact 3 surfaces.

Embodiment 25:

Figure 45 (a) is the oblique view of the fixed contact of embodiment 25, and Figure 45 (b) is the oblique view that the fixed contact of Figure 45 (a) was insulated.

In the fixed contact 4 of above-mentioned Figure 13, slit 40 is arranged on crosses on the 1st conductor 4a and the 3rd conductor 4d, still, 4 of the fixed contacts of present embodiment 25 are arranged on slit 40 on the 3rd conductor 4d hardly.

Like this, remove the slit 40 on the 3rd conductor 4d, can prevent that hot-fluid from flowing to the center of rotation 14 of movable contact 1, simultaneously, can increase the stretching action of the electric current of the 3rd conductor 4d to electric arc on one side.

Embodiment 26:

Figure 46 is the oblique view of the fixed contact of embodiment 26.The fixed contact 4 of present embodiment 26 is arranged on slit 40 on the 1st conductor 4a and the 3rd conductor 4d and a part the 2nd conductor 4e.

By such slit 40 is set, the bending machining of fixed contact 4 is carried out easily.

Embodiment 27:

Figure 47 is the oblique view of the fixed contact of embodiment 27.The fixed contact 4 of present embodiment 27 forms inclined plane shape with the 1st conductor 4a's near the 3rd conductor 4d part on one side.

And, the same with the situation of Figure 46, slit 40 is arranged on above-mentioned the 1st conductor 4a and the 3rd conductor 4d and a part the 2nd conductor 4e.

Therefore, present embodiment 27 also can obtain the result identical with the foregoing description 26.

Embodiment 28:

Figure 48 is the oblique view of the fixed contact of embodiment 28.In the present embodiment, the height of the insulant 15a at the place, slit 40 tops that covers fixed contact 1 is increased.

When adopting such structure, the area of the insulant of the electric arc extruding of being elongated to joint 5 directions increases, thereby the effect of cooling electric arc increases, and arc voltage is risen, so, can improve current limiting performance.

In addition, can also prevent to contact with joint 5, thereby can prevent from arc voltage to be reduced along with between movable contact 1 and joint 5, producing electric arc from the hot gas that steam vent is discharged to joint 5 directions.

Embodiment 29:

Figure 49 is the end view of the arc extinguishing part of embodiment 29, and Figure 50 is the end view that the circuit-breaker of Figure 49 is in off-state.Present embodiment 29 and the foregoing description 1 different place are the tops at the center of above-mentioned the 1st conductor 4a current path that is positioned at movable contact 1.

Below, its action is described.

When big electric current such as short circuit current flow, movable contact 1 does not wait for that the action of mechanism just rotates, and moving contact 2 and fixed contact 3 are separated, and produces electric arc simultaneously between contact 2,3, and these are all identical with situation about having earlier.

Figure 51 is the state before separate above-mentioned contact 2,3.Wherein, arrow is represented electric current, for simplicity, has omitted arc extinguishing board.

In Figure 51, the electric current that flows through movable contact 1 is identical with the sense of current that flows through the 1st conductor 4a, so movable contact 1 is attracted upward.The electric current that flows through the 3rd conductor 4d is vertical with the sense of current that flows through movable contact 1, and the power of the position 1A effect of the 3rd conductor 4d butt joint 5 one side movable contacts 1 is pointed to the direction that movable contact is disconnected.

On the other hand, the 3rd conductor 4d is opposite with the direction that movable contact 1 is disconnected to the power of the position 1B effect of center of rotation 14 1 side movable contacts 1.

But, because the distance from center of rotation 14 to above-mentioned position 1A is greater than the distance to above-mentioned position 1B, so the electric current of the 3rd conductor 4d makes movable contact 1 to disconnecting the direction motion to the moment of inertia of closing of movable contact 1 effect.

Therefore, flowing through the electromagnetic force that each electric current composition of said fixing contact 4 produces all is to make movable contact 1 to disconnecting the power that direction is rotated.

As a result, after just separated the contact, the distance between the contact 2,3 just sharply increased, thereby arc resistance increases sharply.

Figure 52 is after has just separated contact 2,3, and moving contact 2 also is in the state of the 1st conductor 4a below.

From the current path that joint 5 to the 1st conductor 4a constitute, all be in the top of electric arc A.As a result, the electromagnetic force to electric arc A effect of this current path generation is the active force that electric arc A is stretched to joint 5 one laybacks.In addition, flow through the current opposite in direction of electric current and the electric arc A of the 3rd conductor 4d, so the electromagnetic force that flows through the electric current generation of the 3rd conductor 4d also is the active force that electric arc is stretched to joint 5 one laybacks.

Therefore, flowing through the electromagnetic force that the electric current of this fixed contact 4 produces all is the active force that electric arc A is stretched to joint 5 one laybacks.As a result, the electric arc A after contact has just been separated is stretched powerfully, and arc resistance increases sharp.

Figure 53 (a) is that Figure 53 (b) is the profile along the A-A line of Figure 53 (a) for the movable contact shown in the magnetic field distribution that the electric current generation of flowing through fixed contact is described and the end view of fixed contact.Movable contact 1 is different with the foregoing description 1 with the relative position of the 1st conductor 4a.

Among the figure, the 41st, the center of gravity of each section of slit 40 left and right sides the 1st conductor 4a.

Figure 53 (c) is the magnetic field that produces according to the electric current that flows through fixed contact 4 that Theoretical Calculation is obtained, the magnetic field distribution figure on the Z axle of Figure 53 (b), and the magnetic field of positive direction is the magnetic-field component that electric arc is stretched to joint 5 one laybacks.

Shown in Figure 53 (c), the 1st conductor 4a is positioned at the position of the rotational plane of left and right deviation movable contact 1.

In this conductor arrangement, owing to flow through the influence of the electric current of the 2nd conductor 4e and the 3rd conductor 4d, there is the magnetic-field component that electric arc A is stretched to joint 5 directions at the upper space (regional Zo) of the 1st conductor 4a.Therefore, as shown in Figure 54, even the movable contact face turns to the top of the 1st conductor 4a, slit 40 parts at the 1st conductor 4a, electric arc A is subjected to pointing to the active force of joint 5 directions, thereby the insulant 15a that is extruded to the top that covers above-mentioned slit 40 (slit 40 is near the end inner surfaces of joint 5 one sides) part goes up and cooled off.As a result, the arc resistance that has sharply risen after has just separated the contact further increases, thereby can keep high arc voltage, so, current peak can be made and the energy that passes through reduces, thereby the circuit-breaker of good current limiting performance can be obtained having.

In the foregoing description 29, to in order not hinder the rotation of movable contact 1, the shape of the fixed contact 4 of the plane of rotation left and right symmetrically setting of the above-mentioned relatively movable contact 1 of slit 40 is described, but, during with the shape and structure shown in fixed contact 4 formation Figure 55 (a) and Figure 55 (b), also can obtain same effect.

Embodiment 30:

Figure 55 (a) is the oblique view of the fixed contact of embodiment 30, and Figure 55 (b) is the oblique view that the fixed contact with Figure 55 (a) insulated.

The fixed contact 4 of present embodiment 30 as Figure 55 (a), only disposes the 1st conductor 4a in the left side of pointing to joint 5.

For this fixed contact 4, as Figure 56 (a), at the disconnection initial stage of movable contact 1, the first half at electric arc A, the sense of current of the 1st conductor 4a in arc current and above-mentioned left side is identical, so electric arc A attracted on the 1st conductor 4a in above-mentioned left side, contact consumingly with the insulant 15 that covers the 1st conductor 4a and cooled off.Therefore, at the initial stage of above-mentioned disconnection, arc voltage promptly rises.

On the other hand, after separate contact 2,3, when moving contact 2 arrives the top of the 1st conductor 4a, shown in Figure 56 (b) like that, the latter half at electric arc A, the current opposite in direction of the 1st conductor 4a in arc current and above-mentioned left side, repel mutually, so, electric arc A can reduce the vapor volume that this insulant 15 produces away from the insulant 15 that covers above-mentioned left side the 1st conductor 4a, so, the pressure that can suppress to follow electric current to increase in the container 12 rises, thereby can prevent the damage of pressure to container 12.

That is to say that as above-mentioned embodiment 30, only in the left side of the plane of rotation of movable contact 1 relatively or during the 1st conductor 4a that the right side is provided with fixed contact 4, it is good and be difficult to take place the fixed contact 4 of pressure damage container 12 to obtain current limitation effect.

Embodiment 31:

Figure 57 is the end view of the major part of embodiment 31.In present embodiment 31, the shape of the fixed contact 4 of employing is that the joint 5 with power end is configured in the 1st conductor 4a top.Like this, when making joint 5 be positioned at the top of the 1st conductor 4a, can improve the arc voltage at disconnection initial stage effectively rapidly equally.

Embodiment 32:

Figure 58 is the end view of the major part of embodiment 32.In the fixed contact 4 of present embodiment 32, also be the top that the joint 5 of power supply head is configured in the 1st conductor 4a, therefore, can obtain same effect.

Embodiment 33:

Figure 59 is the end view of the major part of embodiment 33.In present embodiment 33, the joint 5 of fixed contact 4 is configured in the top of the 1st conductor 4a, and will and Figure 13 (a), Figure 13 (b) shown in slit (otch) 40 suitable slits be set to very on one side near above-mentioned joint 5.

When adopting such structure, be stretched near the electric current of the electric arc part the joint 5 and the electric current of joint 5 and attract each other, so, before electric arc is elongated to disconnection, can effectively electric arc be elongated.

Like this, elongate owing to can utilize electromagnetic force will disconnect arc length before, so, in the higher circuit of voltage ratio (for example circuit of 550V), for the cut-out action of smaller electric current etc., electromagnetic force has significant effects to the stretching action of electric arc to cutting off performance before cutting off.

Embodiment 34:

Figure 60 is the end view of the major part of embodiment 34.In present embodiment 34, the joint 5 of fixed contact 4 is arranged on the below of the 1st conductor 4a.When adopting such structure, producing the electric current composition identical than electric arc on close a part of conductor of joint 5 one sides on the fixed contact 4 with the electric arc direction.Like this, the magnetic field that the electric current composition identical with the electric arc direction produces at the initial stage that disconnects, makes movable contact 1 move to disconnecting direction, thereby can improve the arc voltage at disconnection initial stage.In addition, because electric current composition and the electric arc identical with above-mentioned electric arc direction attracts each other, so near the electric current that direction makes progress, the electric arc A that is stretched after can separating contact 2,3 gives to a certain degree additional.Therefore, in the way that cuts off action, electric arc A can not be pulled back between the contact 2,3, thereby can keep high arc voltage.

In addition, in present embodiment 34, owing to the surface that above-mentioned joint 5 is configured in fixed contact 3, so the electric current of joint 5 produces the magnetic-field component of the electric arc A on stretching fixed contact 3 surfaces, thereby can improve arc voltage rapidly.

Embodiment 35:

Figure 61 is the end view of the major part of embodiment 35.In present embodiment 35, the joint 5 of fixed contact 4 is arranged on the below on the 1st conductor 4a and fixed contact 3 surfaces.

Like this, when making joint 5 be positioned at the below on surface of fixed contact 3 and the equidirectional electric current composition of electric arc that has replenished above-mentioned electric arc increase, supplementary result is increased, in the latter half of cutting off action, can keep higher arc voltage.Therefore, can shorten and finish the needed time of failure of current, thereby can reduce owing to cut off action at inner gross energy that takes place of circuit breaker and the energy that passes through.

In the foregoing description 35, be with the conductor jointing 5 of vertical direction and fixed contact 4, still, can image pattern 62 and Figure 63 shown in like that, connect with the conductor of inclination.At this moment, can obtain the effect identical basically with the foregoing description 35, in addition, because the sweep of junction is the obtuse angle, so the bending machining of fixed contact 4 is simple.

Embodiment 36:

Figure 64 is the end view of the major part of embodiment 36.In present embodiment 36, the 2nd conductor 4e is extended to center of rotation 14 directions of movable contact 1, replace fixing in the foregoing description 29 the 2nd conductor 4e of the fixed contact 3 of fixed contact 4, make that the electric current that flows through movable contact 1 when flowing through the 2nd conductor 4e electric current partly with closure is substantially parallel and reverse.

When adopting such structure, the electromagnetic force that electric arc A is stretched to joint 5 one laybacks that the electric current of the 2nd conductor 4e produces increases, and act on electromagnetic repulsive force between movable contact 1 and the 2nd conductor 4e when closed, so, the velocity of rotation of movable contact 1 increases, and makes the contact just separate the very fast growth of arc length afterwards.Therefore, arc resistance increases sooner, thereby can further improve current limiting performance.

Embodiment 37:

Figure 65 is the end view of the major part of embodiment 37.In present embodiment 37, even a part that makes movable contact 1 under off-state, also is positioned at by the 1st conductor 4a, the 2nd conductor 4e of fixed contact 4 and the space of the 3rd conductor 4d encirclement.

When adopting such structure, in long-time from the disconnection initial stage to the latter half that disconnects action, movable contact 1 all is subjected to flowing through magnetic field that the electric current of fixed contact 4 produces to the big electromagnetic force that disconnects directive effect.

Therefore, not only at the initial stage that disconnects, and move to the top of the 1st conductor 4a at moving contact 2 after, the opening speed of movable contact 1 does not reduce yet, so, can accelerate to reach time of maximum break distance.

Usually, supply voltage than higher potential circuit (for example 500V) in, in the cut-out action in smaller short circuit current zone, because the electromagnetic repulsive force to movable contact 1 effect is little, even before electric current was about to cut off, the break distance between the contact was also very little, so, sometimes between the contact insulation breakdown can take place, cause the cut-out baulk of electric current.

Therefore, by adopting the foregoing description 37(Figure 65) such structure, quickening reaches the time of the maximum break distance in contact, just can prevent cut-out baulk as described above.

In addition, usually in circuit-breaker, be provided with the means (for example, being arranged on the interior brake of container 12) of 1 scope that can rotate of restriction movable contact.The limiting means of this rotation is not limited to a kind of, two kinds of different situations of break distance d2 of maximum possible when the break distance d1 of maximum possible and mechanism are failure to actuate in the time of can being divided into mechanism's rotation.

In the foregoing description 29, when having introduced big electric current such as short circuit current flow because the effect of electromagnetic force, movable contact 1 does not wait for that the action of mechanism just begins the situation of rotating, but, usually, because the disconnection slow motion that the action of mechanism causes than electromagnetic force when cutting off big electric current is so the influence apart from d2 that maximum possible disconnected when the current limiting performance of circuit-breaker was failure to actuate by mechanism is very big.

Embodiment 38:

Figure 66 and Figure 67 are the end views of the major part of embodiment 38 and variation thereof.In Figure 66 and Figure 67, the break distance d1 of maximum possible of movable contact 1 and these two kinds of different situations of break distance d2 of maximum possible have been expressed.

In Figure 66 and Figure 67,1 expression is positioned at the movable contact at maximum possible break distance d2 place, represents with dotted line, and 1 ' expression is positioned at the movable contact at maximum possible break distance d1 place.

As shown in Figure 66, if make contact-making surface at maximum possible break distance d2 place moving contact 2 be positioned at the 1st conductor 4a above, then when the cut-out action of big electric current, movable contact 1 temporarily rests on 1 the position of Figure 66, begin action until the driving mechanism (not shown), in the latter half of cutting off action, near the electric arc the movable contact 1 one side electric arc spots is become very little to the magnetic-field component that joint 5 directions stretch.Usually because the steam vent (not shown) is located at the top of the 1st conductor 4a, so owing to reducing of above-mentioned magnetic-field component, the spark and the fused mass of emitting from steam vent also reduce.

That is to say, when adopting the such structure of Figure 66, can reduce arc space.

On the other hand, if image pattern 67 make like that the contact-making surface at maximum possible break distance d2 place moving contact 2 be positioned at the 1st conductor 4a below, then when the cut-out action of big electric current, because movable contact temporarily rests on 1 the position of Figure 67, till mechanism begins action, so, even also be positioned at above-mentioned space the latter half cutting off action, all electric current compositions that electric arc is flow through fixed contact 4 stretch effectively, in the latter half of cutting off action, also can keep high arc voltage.But in the higher circuit of voltage ratio, if maximum possible break distance d2 is smaller, the electric arc that is stretched sometimes is along with the insulation breakdown between the contact 2,3 can be withdrawn between the contact again.Sometimes, because the strictness of overall dimension restriction is not provided with maximum possible break distance d2.That is to say that Figure 67 is the structure of the current limiting performance when considering in the lower circuit of voltage ratio big failure of current emphatically.

Embodiment 39:

Figure 68 (a) is the end view of the major part of embodiment 39, and Figure 68 (b) is the profile along the B-B line of Figure 68 (a).

In present embodiment 39, be that the cross section of movable contact conductor 1a forms the umbrella shape shown in Figure 68 (b) with the part of movable contact.

Like this, because the electric current of movable contact conductor 1a deflection below, so, the repulsive force increase of the electric current of the 2nd conductor 4e before soon disconnecting and after just having disconnected, thus the opening speed of contact is further accelerated.

In addition, by the movable contact 1 that uses this shape, the air drag in the time of can reducing movable contact 1 disconnection.

At the disconnection initial stage of arc current than the zonule, by using this movable contact 1, follow the disconnection of movable contact 1, increase from the air capacity that attracts to electric arc on every side, so electric arc is cooled, arc voltage further rises, thereby can improve current limiting performance.

In the above-described embodiments, slit 40 is arranged on the position of the substantial middle of fixed contact 4, the 1st conductor 4a and the 3rd conductor 4d are configured in its right and left.

Like this, when two current paths are parallel to each other, flow through the general characteristic in the magnetic field that the electric current of above-mentioned current path produces, in Figure 40 (a), Figure 40 (b) and Figure 40 (c), introduced in detail.

The position relational application that PO on parallel conductor on this XY plane and the Z axle is ordered is exactly Figure 69 (a) and Figure 69 (b) when the embodiment of reality.

Embodiment 40:

Figure 69 (a) is the end view of the fixed contact of embodiment 40, and Figure 69 (b) is the profile along the C-C line of Figure 69 (a).In present embodiment 40, be the YZ plane with the section of above-mentioned C-C line, 41 be about the center of each section of the 1st conductor 4a, the PO point is the center of the section of movable contact 1.

Wherein, angle θ equals 45 ° ± 10 °.When adopting such structure, also be approximately peaked 94% by the Y direction magnetic field B y minimum that the electric current that flows through the conductor about otch (slit 40) produces at center of gravity PO point.

Therefore, after just disconnecting, the electric current that can maximally utilise the 1st conductor 4a attracts the active force of movable contact 1, the opening speed after raising movable contact 1 has just disconnected, thus can improve arc voltage.

Embodiment 41:

Figure 70 is the oblique view of the fixed contact of embodiment 41.The fixed contact 4 of present embodiment 41 is arranged on slit 40 on the 1st conductor 4a and the 3rd conductor 4d and a part the 2nd conductor 4e.

By slit 40 being arranged on the crooked position of fixed contact 4, the bending machining of fixed contact 4 is carried out easily.

Embodiment 42:

Figure 71 is the oblique view of the fixed contact of embodiment 42.The fixed contact 4 of present embodiment 42 will form tilted shape near the 1st conductor 4a of the 3rd conductor 4d one side.

In addition, the same with Figure 70, slit 40 is arranged on above-mentioned the 1st conductor 4a and the 3rd conductor 4d and a part the 2nd conductor 4e.

Therefore, present embodiment 42 also can obtain the effect identical with the foregoing description 41.

Embodiment 43:

Figure 70 is the oblique view of the fixed contact of embodiment 43.In present embodiment 43, the height of the insulant 15a at the place, slit 40 tops that covers fixed contact 4 is increased.

When adopting such structure, the area of the electric arc extruding insulation thing that stretches to joint 5 directions increases, and the cooling effect of electric arc is increased, and arc voltage is raise, so, can improve current limiting performance.

In addition, can prevent to touch joint 5 to the hot gas of joint 5 directions ejections, thereby can prevent to follow produces electric arc between movable contact 1 and the joint 5 and arc voltage is reduced from steam vent.

Embodiment 44:

Figure 73 is the end view of arc extinguishing part when being in closure state as the circuit-breaker that the switch of embodiment 44 is cut container open, Figure 74 is the side view of the circuit-breaker of Figure 73 when becoming off-state, Figure 75 is the plane graph of the fixed contact of Figure 73 and Figure 74, Figure 76 is the front elevation of the fixed contact of Figure 75, and Figure 77 is the oblique view of the fixed contact of Figure 75.Except the connection structure of movable contact 1 described below and fixed contact 4, other structure is identical with the foregoing description 1, so explanation is omitted.

4 integral installations of said fixing contact are fixed on the container 12, are arranged on the 3rd conductor 4d than the end that moving contact 2 is not set of the more close movable contact 1 in the position of fixed contact 3 and are positioned at reciprocal one side (rotating fulcrum 14 of movable contact 1 on one side) of above-mentioned joint 5.At this moment, contact with fixed contact 3 at moving contact 2, when being in contact closure condition, the 1st conductor 4a all is positioned at the top of this contact contact-making surface, and also be positioned at when disconnecting in the contact movable contact 1 above.

Below, describe the connection structure of above-mentioned movable contact 1 and said fixing contact 4 in detail.

At first, fixed contact 4 is integrally formed by the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d and slightly is the U word shape, and the joint 5 of power end and an end of this U word shape are that the end of the power-supply system link of above-mentioned the 1st conductor 4a is connected.It is the upper surface of above-mentioned the 2nd conductor 4e that fixed contact 3 is fixed on the other end U font inboard relative with it.In addition, in said fixing contact 4, on the bonding conductor above the stationary plane that is positioned at said fixing contact 3 (the 1st conductor 4a and the 3rd conductor 4d), be provided with slit 40.

This slit 40 is provided with for the switch motion that does not hinder the fixed contact 3 on above-mentioned relatively the 2nd conductor 4e of movable contact 1.

In the altitude range of the 3rd conductor 4d of such fixed contact 4, the center of rotation 14 of movable contact 1 is configured in the foreign side position relative with the above-mentioned slit 40 of the 3rd conductor 4d.Like this, above-mentioned movable contact 1 just can rotate in the contact switch direction by above-mentioned slit 40.In addition, no matter always above-mentioned movable contact 1 disposes to such an extent that be that contact closure condition or the 1a of this movable contact 1 of contact off-state part overlap with above-mentioned fixed contact 4 mutually by above-mentioned slit 40.

Therefore, under the off-state of movable contact 1, the 1st conductor 4a of fixed contact 4 is positioned at the below of the contact-making surface of moving contact 2, and be positioned at the below of the 1a part of movable contact 1, the 1a part of this movable contact 1 this movable contact 1 from make position to become off-state be positioned at all the time fixed contact 4 the 1st conductor 4a below.

In addition, under the off-state of contact, on the 1st conductor 4a of fixed contact 4, the part of facing the surface of moving contact 2 is coated with insulant 15.This insulant 15 is made of insulant 15a and insulant 15b, 15c, 15d, and insulant 15a is with the top insulation of the 1st conductor 4a; Insulant 15b, 15c, 15d will not hinder the inner surface insulation of the slit 40 on the 1st conductor 4a that movable contact 1 rotates.

Below, its action is described.

Figure 78 is the action specification figure of the closure state of movable contact 1, under this closure state, when big electric current such as short circuit current flow, movable contact 1 is not just waited for the action of driving mechanism and is begun to rotate, moving contact 2 and fixed contact 3 are separated, and between contact 2,3, producing electric arc A, these are all identical with situation about having earlier.

Figure 79 is the effect owing to the contact electromagnetic repulsive force, the state after moving contact 2 has just been separated with fixed contact 3, and under this state, the contact-making surface of moving contact 2 also is in the below of the 1st conductor 4a.Wherein, arrow is represented electric current.

At the state of the firm after separating in this contact, the forceful electric power magneticaction that points to rotation direction is on movable contact 1.This is because the electric current that flows to the 1st conductor 4a from the joint 5 of power end like that identical with the sense of current that flows through movable contact 1 shown in arrow the figure, attract each other, the result just has the power F that makes progress with the direction shown in the thick arrow among the figure to act on the movable contact 1, and, flow through the electric current of the 2nd conductor 4e of fixed contact 4 and the current opposite in direction of movable contact 1, repel mutually, this repulsive force also is to make the active force of movable contact 1 to the rotation direction motion.

In addition, flow through the magnetic field that the electric current of the 3rd conductor 4d of fixed contact 4 produces, contrasting the 3rd conductor 4d also is the power F that action direction makes progress near 1a, the 1b part of the movable contact 1 of fixed contact 3.Therefore, all electric currents that flow through joint 5 → fixed contact 4 all produce the rotatory force that direction makes progress to just separating shown in Figure 79 on the movable contact afterwards, so movable contact 1 just disconnects at a high speed.As a result, contact spacing is from being that arc length increases sharp, and arc voltage also rises sharp.

Under the state of Figure 79, flowing through magnetic field that the electric current of joint 5 and fixed contact 4 produces all is with the power F ' of above-mentioned electric arc A to the stretching of joint 5 directions to the electric arc A effect that takes place between the contact 2,3.

That is to say that the sense of current that flows through the 1st conductor 4a of joint 5 and fixed contact 4 is the direction that flows from right to left in the drawings.Electric arc A for being positioned at mobile the 1st conductor 4a below of this electric current just acts on the electromagnetic force that this electric arc A is stretched to joint 5 one laybacks; And the sense of current that flows through the 2nd conductor 4e is the direction that flows from left to right in the drawings, also is effect stretches electromagnetic force from this electric arc A to joint 5 directions for the electric arc A that takes place above this electric current.In addition, owing to the electric current of the 3rd conductor 4d that flows through fixed contact 4 and the current opposite in direction of electric arc A, repel mutually, so electric arc A is also stretched to joint 5 one laybacks.

Therefore, all electric currents that electric arc A is flow through joint 5 and fixed contact 4 stretch consumingly to above-mentioned joint 5 directions, and arc voltage increases sharp.

Figure 80 is the maximum off-state of movable contact 1, and movable contact 1 is in the process that disconnects, and such as shown, this movable contact 1 partly overlaps mutually with fixed contact 4, and the 1a part of this movable contact 1 is positioned at the below of the 1st conductor 4a of fixed contact 4 all the time.Therefore, the 1a partial action of equidirectional power F continuation to movable contact 1 always arranged, make opening speed can not reduce, thereby movable contact 1 just can be finished the disconnection action at short notice.

Like this, just can obtain the effect of the movable contact 1 high bundle disconnection and the electric arc A between the contact 2,3 that stretches consumingly, therefore, the arc voltage after disconnecting increases sharp.

In the such large-current electric arc of short circuit current, the metal vapors stream from the electric arc root of contact surface along the direction ejection contact evaporation on vertical contact surface, it is now know that, and this steam flow is the main composition thing of electric arc A.

As shown in Figure 80, owing to insulate in the face of the 1st conductor 4a on the surface of moving contact 2 is insulated thing 15, so, after running into insulant 15, the metal vapors of the surface ejection of moving contact 2 is cooled, make the arc voltage rising.

In addition, by fixed contact 4 produces electric arc A is cooled after the electromagnetic force that joint 5 directions stretch also makes electric arc A touch insulant 15.

Figure 81 is the profile along the A-A line of Figure 80.Among the figure, the 41st, the center of the 1st conductor 4a of slit 40 left and right sides and each section of the 2nd conductor 4e.

Figure 82 is the magnetic field that produces according to the electric current that flows through fixed contact 4 that Theoretical Calculation is obtained, the magnetic field distribution figure on the Z of Figure 81 axle, and the magnetic field of positive direction is to magnetic-field component that joint 5 directions stretch (below, be called the electric arc driving magnetic field) with electric arc A.

Shown in Figure 81 like that, the 1st conductor 4a is positioned at the position, the left and right sides of the rotational plane that departs from movable contact 1.

In such conductor arrangement, owing to flow through the influence of the electric current of the 2nd conductor 4e and the 3rd conductor 4d, shown in Figure 82, all having the magnetic-field component that electric arc A is stretched to joint 5 one laybacks up to the upper space (ZO zone) of the 1st conductor 4a is the electric arc driving magnetic field.

Therefore, in the part of the slit 40 of the 1st conductor 4a, electric arc A also is subjected to the electromagnetic force of stretching to joint 5 one laybacks, is extruded to the insulant 15d that covers these slit 40 tops (near the end inner surface of the slit 40 of joint 5 one sides) part and goes up and cooled off.As a result, the arc voltage that raises sharp after just separate the contact further increases, and, can keep high arc voltage, so, the energy that can reduce current peak and pass through, thus can obtain to have the circuit-breaker of good current limiting performance.

Embodiment 45:

In the foregoing description 44, the 1st conductor 4a integral body of having introduced fixed contact 4 is the situation of horizontal shape, and still, said fixing contact 4 also can be the shape shown in Figure 83.

Figure 83 is the end view of the major part of embodiment 45, and movable contact 1 is in the state of disconnection.

The fixed contact 4 of present embodiment 45 forms the 3rd conductor 4d one side at oblique upper and the inclination conductor 4a ' that tilts gradually with the 1st conductor 4a near the part of the 3rd conductor 4d one side.

That is, for the superjacent air space that makes the 1st conductor 4a increases, and the 1a part that makes movable contact 1 is in the below of the 1st conductor 4a that constitutes fixed contact 4 during from the closing of contact all the time when the contact disconnects, with the 1st conductor 4a from crooked upward midway.

The situation of present embodiment 45 not only can obtain the result identical with the foregoing description 44, and, owing to increased near the superjacent air space of joint 5 the 1st conductor 4a on one side, so, the quantity of arc extinguishing board 6 can be increased.As a result, the cooling effect of 6 couples of electric arc A of arc extinguishing board increased when movable contact 1 disconnected, thereby can obtain the good circuit-breaker of current limiting performance.

Embodiment 46:

Figure 84 is the end view of the major part of embodiment 46.The 3rd conductor 4d that the fixed contact 4 of present embodiment 46 will slightly be the perpendicular shape attitude in the above-described embodiments forms skewed.The link position that like this, just makes the 2nd conductor 4e and the 3rd conductor 4d is than more close joint 5 one sides of the link position of the 1st conductor 4a and the 3rd conductor 4d.

The situation of present embodiment 46, not only can obtain the effect identical with the foregoing description 45, and owing to enlarged space between the 3rd conductor 4d of the center of rotation 14 of movable contact 1 and fixed contact 4, so, for the design of the driving mechanism that drives movable contact 1 provides the condition that makes things convenient for.

Embodiment 47:

Figure 85 is the end view of the major part of embodiment 47.In present embodiment 47, the 1st conductor 4a of fixed contact 4 and the 2nd conductor 4e are prolonged on one side to the center of rotation 14 of movable contact 1, and make this center of rotation 14 between the 1st conductor 4a and the 2nd conductor 4e (inner space of fixed contact 4).

Promptly, in the foregoing description 46, make the center of rotation 14 of movable contact 1 be positioned at the outside of the 3rd conductor 4d of fixed contact 4, but, as in this embodiment 47, by the center of rotation 14 of movable contact 1 being set to the inner space of fixed contact 4, the opening speed of above-mentioned movable contact 1 can be further accelerated, thereby the good circuit-breaker of current limiting performance can be obtained.Certainly, also can obtain the effect identical with the foregoing description 46.

Embodiment 48:

Figure 86 (a) is the front elevation of the fixed contact of embodiment 48, and Figure 86 (b) is the end view of Figure 86 (a), and Figure 86 (c) is the plane graph of Figure 86 (b), and Figure 87 is the oblique view of this fixed contact.

The fixed contact 4 of present embodiment 48 removes the 1st conductor of slit 40 both sides in the foregoing description 47 on one side, has only the 1st monolateral conductor 4a.

Such fixed contact 4 disconnects the electric arc the first half at initial stage at movable contact 1, the electric current of this electric arc is identical with the sense of current of above-mentioned monolateral the 1st conductor 4a, so electric arc attracted on above-mentioned monolateral the 1st conductor 4a, and after contacting consumingly, the insulant 15 that covers the 1st conductor 4a is cooled.Therefore, at the above-mentioned disconnection initial stage, arc voltage just very rapidly rises.

On the other hand, after separate contact 2,3, when moving contact 2 is positioned at the top of the 1st conductor 4a, in the latter half of above-mentioned electric arc, the current opposite in direction of arc current and above-mentioned monolateral the 1st conductor 4a, repel mutually, so electric arc keeps away the insulant 15 that covers above-mentioned monolateral the 1st conductor 4a, so, the vapor volume that takes place from this insulant 15 reduces, and the pressure that can reduce to follow the electric current increase to cause in the container 12 rises, thereby can prevent the damage of pressure to container 12.

That is to say that as in this embodiment 48, if only at the relatively left side of the plane of rotation of movable contact 1 or monolateral the 1st conductor 4a that the right is provided with fixed contact 4, it is good and be difficult to take place the fixed contact 4 of pressure damage container 12 then can to obtain current limiting performance.

Embodiment 49:

Figure 88 is the oblique view of the fixed contact of embodiment 49, and Figure 89 is the side view that the fixed contact of movable contact and Figure 88 is in closure state, and Figure 90 is the end view that Figure 89 becomes off-state.

In present embodiment 49, the same with the situation of the various embodiments described above, on fixed contact 4, also be provided with slit 40 in order not hinder movable contact 1 to rotate.

But, in present embodiment 49, on fixed contact 4 with slit 40 from the 1st conductor 4a, be formed into by the 3rd conductor 4d near the fixed contact 3 of the 2nd conductor 4e always.Like this, an end 40a of above-mentioned slit 40 just is set on the 2nd conductor 4e, near said fixing contact 3.Such fixed contact 4 is the same with the situation of the foregoing description 48, and from the centre of the 1st conductor 4a to the 3 conductor 4d, insulant 15 in the coating.

Below, the action of present embodiment 49 is described.Figure 91 is the end view that major part has afterwards just been separated in the contact that illustrates that is used for action specification.As previously mentioned, after if fixed contact 4 constitutes, make the 1st conductor 4a be positioned at the surface of fixed contact 3, connect center of rotation 14 one sides of the 3rd conductor 4d of the 2nd conductor 4e and the 1st conductor 4a than fixed contact 3 more close movable contacts 1, then after just separated the contact, the electric current that flows through the described conductor that constitutes fixed contact 4 produced the electromagnetic force Fm that points to joint 5 directions to the electric arc A that is positioned at the 1st conductor 4a below.Therefore, electric arc A is elongated greatly, thereby the very large numerical value of the very fast rising of arc voltage has afterwards just been separated in the contact.

In addition, when reaching the contact off-state shown in Figure 92, as previously mentioned, owing to blow to the effect of being freezed strongly on the insulant 15 of the 1st conductor 4a that covers fixed contact 4 but from the electrode steam of the surface of moving contact 2 ejection, with electric arc A be extruded under the forceful electric power magneticaction cover slit 40 near the insulant 15c of the inner surface of joint 5 one sides on and the effect that is cooled also can be kept high arc voltage.

Below, illustrate in the foregoing description 49 an end 40a of slit 40 is set to effect on the 2nd conductor 4e.

Figure 93 is the oblique view of the fixed contact identical with Figure 77, and Figure 94 is the oblique view the when fixed contact of Figure 93 and movable contact are in closure state, in this Figure 94, has omitted insulant 15.

Illustrate that at first the end 40a who is arranged on the slit 40 on the fixed contact 4 shown in Figure 93 is positioned at the situation on the 3rd conductor 4d.

As seen from the figure, the slit 40 of fixed contact 4 flow through the electric current I of movable contact 1 (arrow among the figure) around form loop circuit C.

Therefore, if when the electric current I of time to time change flows through movable contact 1, will be owing to electromagnetic induction produce electromotive force among in its vicinity the loop circuit C.The generation of electromotive force is by by being that the magnetic flux of the curved surface on border changes in time and causes with loop circuit C.

Here, because an end 40a of slit 40 is positioned on the 3rd conductor 4d, and the other end 40b of slit 40 is positioned on the 1st conductor 4a, so, be that the curved surface on border comprises the slit jaw S2 parallel with the 3rd conductor 4d and slit jaw S1 two parts parallel with the 1st conductor 4a with loop circuit C.Wherein, the slit jaw S2 parallel with the 3rd conductor 4d basically and flow through the current vertical of movable contact 1, and be substantially parallel with the magnetic flux that this electric current produces.Therefore, can not consider to flow through magnetic flux that the electric current of movable contact 1 produces and the interlinkage of slit jaw S2.In addition, for slit jaw S1, be symmetrical fully if slit 40 relative currents are crossed the electric current of movable contact 1, then as can be known, there are not magnetic flux and slit jaw S1 interlinkage by Figure 95 yet.

Figure 95 is the profile vertical with the slit jaw S1 of Figure 94, among the figure, and the 41st, the center of the 1st conductor 4a of slit 40 both sides, i.e. the center of loop circuit C, I is the center of the electric current of movable contact 1.Magnetic flux B and center I that the electric current I produces are coaxial, if slit 40 relative center I are symmetrical, it is equal with the magnetic flux that passes from the top down then to pass the magnetic flux of slit jaw S1 from bottom to top, so, on the whole, equal zero with the magnetic flux of slit jaw S1 interlinkage.

But, usually, be difficult to assemble to such an extent that make slit 40 relative movable contacts 1 symmetrical fully.In addition, during as big failure of current, big active force act in the process of movable contact 1 shown in Figure 96 like that, movable contact 1 inevitably relatively slit 40 depart from.Figure 97 is at this moment vertical with slit jaw S1 profile, and magnetic flux and slit jaw S1 that the electric current I produces have interlinkage.

At this moment.By simple computation, can estimate with the size of the magnetic flux φ of slit jaw S1 interlinkage and loop circuit C in faradic size.

Figure 98 is the ideograph that aforementioned calculation is used, and with the loop circuit C and the electric current I that flows through movable contact 1 of the approximate slit 40 of straight line, the length of side of this slit jaw S1 and slit jaw S2 is D, H, L, in the calculating, as mentioned above, disregards the magnetic flux with slit jaw S2 interlinkage.If slit jaw S1 cell area vector is the dS shown in Figure 98.

Figure 99 is the profile vertical with slit jaw S1.Wherein, the conductor center 41 of slit 40 both sides of establishing the 1st conductor 4a is on X-axis, and the center of electric current of flowing through movable contact 1 is on Y-axis, and X-axis and Y-axis and intersection point are initial point.In addition, the Y coordinate of establishing the electric current I is a(a＜0), the angle between the center 41 of Y-axis and 40 liang of side conductors of slit is respectively θ 1(＜0) and θ 2(＜0).

At this moment, the magnetic flux φ with slit jaw S1 interlinkage of electric current I generation is

φ＝∫B·ds （1）

Because of the direction of the electric current I of Figure 99 does not change, so, have

B·ds＝｜B｜sinθdxL （2）

dx＝-adθ/cos ²θ （3）

In addition, because of

γ＝-a/cosθ （4）

So, can get

｜B｜＝-μⅠcosθ/2πa （5）

Wherein, μ is the magnetic permeability of vacuum.(2)～(5) formula formula is gone into (1) formula, can get

φ＝∫2tgθdxμⅠL/2π （6）

So, have

θ＝-μⅠLlg（cosθ2/cosθ1）/2π （7）

According to the law of electromagnetic induction, the voltage Vc that responds among the loop circuit C is

Vc＝-dφ/dt （8）

If the peak value of electric current I is I p, angular frequency is the simple sinusoidal alternating current of ω, promptly

Ⅰ＝Ⅰpsinωt （9）

With (7), (9) formula substitution (8) formula, can get

Vc＝μⅠpLωcosωtlg（cosθ2/cosθ1）/2π （10）

The induced current I c of loop circuit is

Ⅰc＝Vc/R （11）

R is the resistance of loop circuit C, and the resistivity of establishing circuit is ρ, and sectional area is S, then

R＝ρ2（D+L+H）/S （12）

Even the electric current that flows through fixed contact 4 separately flows into the conductor of slit 40 both sides equably, also can in loop circuit C, produce induced current as described above, so the electric current of slit 40 both sides will produce unbalanced.Unbalanced electric current I u=I c, euqalizing current I b=I/2, unbalanced electric current with the ratio of euqalizing current is

Ⅰu：Ⅰb∝Lcosωt/sinωt （13）

By above-mentioned (13) formula as can be known, t is more little, and the ratio of unbalanced electric current is big more, therefore, after movable contact 1 just disconnects, promptly during the state shown in Figure 91, flows through the lack of uniformity maximum of electric current of slit 40 both sides of fixed contact 4.Therefore, the electromagnetic force of electric arc A effect is also produced very big lack of uniformity, thereby electric arc A also departs from the direction that stretches to joint 5 directions.At this moment, the above-mentioned insulant 15 of the 1st conductor 4a and covering slit 40 will be subjected to the damage of electric arc A partly, thereby the danger that insulation breakdown takes place increases.Because be difficult to predict this departing from advance, so, if do not thicken all insulants 15, just can not prevent the insulation breakdown of fixed contact 4, this is subjected to very big restriction with regard to the design that makes electrode.

On the other hand, the fixed contact of present embodiment 49 has the slit 40 of shape shown in Figure 100, because an end 40a of this slit 40 is positioned on the 1st conductor 4a, so, with the circumferential annular circuit C of slit 40 is that the curved surface on border not only is positioned on the 1st conductor 4a and the 3rd conductor 4d, and is positioned on the 2nd conductor 4e.Ask the ideograph of unbalanced electric current at this moment to be shown in Figure 101 and Figure 102.

In Figure 101, L1 is the length of the slit jaw S1 of the 1st conductor 4a, and L2 is the length of the slit jaw S2 of the 2nd conductor 4e.Shown in Figure 102 like that, the angle that connects angle between line and the Y-axis at center of 40 liang of side conductors of slit of the center of electric current of movable contact 1 and the 2nd conductor 4e and relative the 1st conductor 4a is identical, establishes and is respectively θ 1, θ 2.

This pattern is carried out as before calculating, ask the ratio of unbalanced electric current, can get

Ⅰu/Ⅰb∝（L1-L2）cosωt/sinωt （14）

This presentation of results if increase the length L 2 of the slit jaw S3 of the 2nd conductor 4e, then can make unbalanced electric current reduce.

Therefore, as in this embodiment 49, an end 40a of slit 40 is set on the 2nd conductor 4e, have the electric current of slit 40 both sides that reduce to flow through fixed contact 4 lack of uniformity, make electromagnetic force effect of uniform to electric arc A effect.As a result, the insulant 15 of fixed contact 4 can not caused local damage by electric arc A, thereby can prevent the danger of the insulation breakdown of fixed contact 4.

Embodiment 50:

Figure 103 is the end view when making the fixed contact of embodiments of the invention 50 and movable contact be in closure state.

The fixed contact 4 of present embodiment 50 forms tilted shape with the 3rd conductor 4d, and making the angle between the 1st conductor 4a and the 3rd conductor 4d is acute angle.

That is, (14) formula shows, in order to reduce unbalanced electric current, can use with the magnetic flux of the slit jaw S3 interlinkage of the 2nd conductor 4e and offset magnetic flux with the slit jaw S1 interlinkage of the 1st conductor 4a.

Therefore, as in this embodiment 50, offset magnetic flux with slit jaw S1 interlinkage in order to use with the magnetic flux of the slit jaw S2 interlinkage of the 3rd conductor 4d, the contact-making surface the during closing of contact is provided with the 3rd conductor 4d obliquely relatively, and is also effective to reducing unbalanced electric current.

At this moment, if use to offset with the slit width of the slit jaw S2 of the magnetic flux of the slit jaw S1 interlinkage of the 1st conductor 4a and S3 greatlyyer than slit jaw S1, then effect is better.

Embodiment 51:

Figure 104 makes the fixed contact of embodiment 51 and the end view that movable contact is in off-state.

The fixed contact 4 of present embodiment 51 forms the tilted shape opposite with the situation direction of the foregoing description 50 with the 3rd conductor 4d, angle between the 1st conductor 4a and the 3rd conductor 4d is the obtuse angle, and with the 3rd conductor 4d be provided with make the streamline that comprises the electric current (arrow among the figure) that flows through the 3rd conductor 4d the vertical planar S of the interior track of describing during with movable contact 1 switch when disconnecting and movable contact 1 non-intersect.In addition, other structure is identical with the foregoing description 50.

In present embodiment 51, the electric arc after just having disconnected also is subjected to flowing through the forceful electric power magnetic force to joint 5 directive effects that the electric current of all conductors that constitute fixed contact 4 produces, so arc voltage rises very soon.

Figure 105 is the end view for the circuit-breaker of example with embodiment 51 contrasts.

As previously mentioned, can vertically spray metal vapors stream with contact surface from the root of large-current electric arc, but, as Figure 105, if the root of the electric arc when disconnecting on the moving contact 2 moves to the preceding extreme direction of movable contact 1, then will point to the direction of steam vent 13 from the metal vapors stream H of electric arc root ejection, thus the metal vapors of high temperature flow H can be directly to outside drain, abnormally dangerous.In addition, the pressure cooling effect of 15 pairs of metal vapors stream of insulant H also weakens.In Figure 105, metal vapors stream H represents that with dotted line the current path A of electric arc dots.

But, in present embodiment 51, shown in Figure 104 like that, the surface of moving contact 2 during disconnection, be positioned at the streamline that comprises the electric current that flows through the 3rd conductor 4d planar S above, in this field, flow through the magnetic field that the electric current of the 3rd conductor 4d produces, producing the root of the electric arc on the moving contact 2 is the electromagnetic force that center of rotation one layback of movable contact 1 is stretched to the opposite direction of steam vent 13.

Therefore, the root of the electric arc during disconnection on the moving contact 2 is difficult to move to the preceding extreme direction of movable contact 1, shown in Figure 106 like that, the root of the electric arc A of movable contact 1 one sides rests on the moving contact 2 easily during disconnection, can directly not set out from the metal vapors stream of the root of electric arc A ejection from steam vent 13 dischargings, so, very safe.In addition, as mentioned above, it is also very effective that 15 pairs of insulants blow to the pressure cooling effect of the metal vapors stream above it, can keep higher arc voltage.

Embodiment 52:

Figure 107 is the end view of the major part of embodiment 52, in present embodiment 52, opposite with the foregoing description 51, with the 3rd conductor 4d be provided with make the electric current (arrow among the figure) that comprises the 3rd conductor 4d that flows through fixed contact 4 streamline the vertical planar S of the interior track of describing during with movable contact 1 switch when disconnecting and movable contact 1 intersect.Other structure is identical with the foregoing description 51.

In present embodiment 52, when big failure of current, the electric arc after just having disconnected also is subjected to flowing through the forceful electric power magnetic force to joint 5 directive effects that the electric current of all conductors that constitute fixed contact 4 produces, so arc voltage rises very soon.In addition, during disconnection owing to blow on the insulant 15 and electric arc is expressed on the insulant 15 by forceful electric power magnetic force from the metal vapors stream of moving contact 2 ejection, so, equally also can keep high arc voltage.

In addition, in present embodiment 52, when little failure of current, the surface of moving contact 2 be positioned at the electric current streamline that comprises the 3rd conductor 4d planar S below.In this zone, the electric current of the 3rd conductor 4d produces the magnetic force that gets rid of that drives to the root of the electric arc on the moving contact 2 to the preceding extreme direction of movable contact 1.

Therefore, shown in Figure 108 like that, the root of the little arc current of movable contact 1 one sides usually is driven into the preceding extreme direction of movable contact 1 on the moving contact 2, so, stretch very longly, thereby can improve the cut-out performance of little electric current.

Embodiment 53:

Figure 109 is the end view of the major part of embodiment 53, illustrated is movable contact 1 only in driving mechanism (driving mechanism 8 as Fig. 1 is identical) effect off-state down, Figure 110 is the end view that movable contact 1 is subjected to the maximum off-state that electromagnetic repulsive force reaches when failure of current greatly.

In present embodiment 53, with the 3rd conductor 4d be provided with make the electric current (arrow among the figure) that comprises the 3rd conductor 4d that flows through fixed contact 4 streamline in the interior vertical planar S of describing during with movable contact 1 switch of track, shown in Figure 109 like that, intersect with the movable contact that only under the driving mechanism effect, disconnects, and, shown in Figure 110 like that, non-intersect with the movable contact 1 that is issued to maximum off-state in the electromagnetic repulsive force effect.Other structure is identical with the foregoing description.

In present embodiment 53, during big failure of current, after just having separated, electric arc also is subjected to flowing through the forceful electric power magnetic force that the electric current of all conductors that constitute fixed contact 4 stretches to joint 5 directions, so arc voltage rises very soon.In addition, as Figure 110, during big failure of current, because the effect of electromagnetic repulsive force and arc pressure, movable contact 1 is disconnected to greatest extent, so, the magnetic field that the 3rd conductor 4d produces becomes the electromagnetic force that the root that makes the electric arc on the moving contact 2 rests on this place on the surface of moving contact 2.

As a result, as above-mentioned embodiment 51 is described, owing to can not be discharged into the outside from the high-temperature metal steam flow of electric arc root ejection, thus very safe, and insulant 15 can carry out desirable pressure cooling to metal vapors, thus can keep high arc voltage.

In addition, when little failure of current, because movable contact 1 only disconnects under the driving mechanism effect, so as Figure 109, the magnetic field that the 3rd conductor 4d produces forms on the surface of moving contact 2 root of the electric arc electromagnetic force to the front-end driven of movable contact 1.As a result, as previously mentioned, electric arc is stretched very long, has improved little current shut-off performance.

Therefore,, can prevent that metal vapors from flowing to outside drain during big failure of current, keep high arc voltage according to present embodiment 53, and, little current shut-off performance also improved.

Embodiment 54:

Figure 111 is the oblique view of the fixed contact of embodiment 54, and Figure 112 is the plane graph of Figure 111, and Figure 113 is the end view after movable contact has just disconnected.

The fixed contact 4 of present embodiment 54 makes the 2nd conductor 4e have the export-oriented conductor 40e that prolongs to the rightabout of fixed contact 3, the prolongation conductor 40d that integrally prolongs from the 3rd conductor 4d that makes that the 3rd conductor 4d has that two side ends 40e ' with this extroversion conductor 40e links into an integrated entity.And, make the electric current streamline that comprises the export-oriented conductor 40e that flows through above-mentioned the 2nd conductor 4e the interior vertical plane of describing during with movable contact 1 switch of track be positioned at fixed contact 3 the surface below.

In present embodiment 54, during big failure of current, shown in Figure 113 like that, after just having separated, electric arc A also is subjected to flowing through the forceful electric power magnetic force that the electric current of all conductors that constitute fixed contact 4 stretches to joint 5 directions, so, longly on the arc voltage rise very soon.In addition, under off-state, owing to blow on the insulant 15 and electric arc is expressed on the insulant 15 by forceful electric power magnetic force from the metal vapors stream of moving contact 2 ejection, so, equally also can keep high arc voltage.

In addition, in present embodiment 54, the electric current that flows through the export-oriented conductor 40e that the rightabout to the fixed contact 3 of the 2nd conductor 4e extends can strengthen the electric arc driving magnetic field of the superjacent air space of said fixing contact 3.

Figure 114 is the simple profile along the B-B line of Figure 113, there is shown the center of the prolongation conductor 40d of the export-oriented conductor 40e of the 2nd conductor 4e and the 3rd conductor 4d.Among the figure, P represents composition surface, and S comprises the electric current that the flows through above-mentioned export-oriented conductor 40e vertical plane of track when switch interior and movable contact 1.

Here, the length of perpendicular of establishing from the P point to the center of export-oriented conductor 40e is l, is θ from the P point to the vertical line that prolongs conductor 40d with to the angle the vertical line of above-mentioned export-oriented conductor 40e.If with electric arc that P is ordered to the magnetic field of joint 5 one side drives for just, then the P magnetic field B p of ordering is

Bp∝μⅠ（l-cos ²θ）/2πl （15）

Therefore, by the 2nd conductor 4e of fixed contact 4 is extended to the rightabout of fixed contact 3, can strengthen the electromagnetic force that the electric arc A with the superjacent air space of said fixing contact 3 stretches to joint 5 directions.

Figure 115 is the end view of variation of the fixed contact of the foregoing description 54, and Figure 116 is the end view of this other variation of fixed contact, and Figure 117 is the plane graph of Figure 116.

The fixed contact 4 of the foregoing description 54 also can be shown in Figure 115 like that, the 3rd conductor 4d formation tilted shape.In addition, also can be shown in Figure 116, Figure 117 like that, export-oriented conductor 40e is further prolonged, no matter which kind of situation can obtain good effect.

Figure 118 is the end view of another variation of the fixed contact of the foregoing description 54, and the fixed contact 4 of this variation only is arranged on the 1st conductor 4a and the 3rd conductor 4d on one side, and such structure also has same effect.

Embodiment 55:

Figure 119 is the end view of major part when contact closure condition of embodiment 55, and Figure 120 is the oblique view of the fixed contact among Figure 119.

In present embodiment 55, be provided with the reclinate protuberance 11 of the fixed contact 3 that points to fixed contact 4 at the free end of movable contact 1, with moving contact 2 be fixed on this protuberance 11 below.

In addition, on fixed contact 4, on the 1st conductor 4a, be provided with the opening 42 that the protuberance 11 of allowing above-mentioned movable contact 1 passes through, so that the current path of the track hithermost part of the 3rd conductor 4d when guaranteeing with movable contact 1 switch.Other structure is identical with the foregoing description, so explanation is omitted.

In present embodiment 55, when big failure of current, the electric arc A after just having begun separately also is subjected to flowing through the forceful electric power magnetic force of the electric current of all conductors that constitute fixed contact 4 to joint 5 directive effects, so arc voltage rises very soon.In addition, when off-state, owing to blow on the insulant 15 and electric arc is expressed on the insulant 15 by forceful electric power magnetic force from the metal vapors stream of moving contact 2 ejection, so, equally also can keep high arc voltage.

Figure 121 is the end view of embodiment 55 major part after just disconnecting, and Figure 122 is the end view that Figure 121 becomes the major part of maximum off-state.

In present embodiment 55, shown in Figure 121 like that, after just separating, the electric current that produces the 3rd conductor 4d of the electromagnetic force that electric arc A is stretched to joint 5 directions flows in the part of the most close electric arc A.That is, because the track of the 3rd conductor 4d when the having guaranteed current path of close part with movable contact 1 switch, so, can obtain the electromagnetic force Fm of bigger stretching electric arc A.

In addition, owing to do not have opening on the 3rd conductor 4d of fixed contact 4, so the pressure that electric arc A produces can not leak, thereby because the effect of pressure Fp also has the effect that electric arc A is stretched to joint 5 directions.Under the off-state shown in Figure 122, because pressure Fp can be from the 3rd conductor 4d direction leakage of fixed contact 4, so electric arc A sprays upward owing to the effect of pressure Fp, thereby can further improve arc voltage.

Figure 123 is the oblique view of fixed contact of the variation of embodiment 55, the fixed contact 4 of this variation forms width than the narrow shape of the 1st conductor 4a with the 3rd conductor 4d, like this, electric current is more concentrated in current path that the 3rd conductor 4d the forms current path of close electric arc ().Therefore, according to this variation, in the part of the switch track of the most close moving contact 2 of the 3rd conductor 4d with current concentration.

Embodiment 56:

Figure 124 is the switch as embodiment 56, the end view of arc extinguishing part during the closure state of the circuit-breaker that container is cut open, Figure 125 is the end view that the circuit-breaker of Figure 124 becomes off-state, Figure 126 is the plane graph that comprises the fixed contact of the arc extinguishing side plate among Figure 124 and Figure 125, Figure 127 is the front elevation of Figure 126, and Figure 128 is the oblique view of Figure 126.

Except the connection structure of movable contact described below and fixed contact, other is all identical with the foregoing description, and explanation is omitted.

Said fixing contact 4 is installed on the container 12, makes the 3rd conductor 4d be positioned at an end of not fixing fixed contact 2 than the more close movable contact 1 in the position of fixed contact 3, and with above-mentioned joint 5 relative (rotating fulcrum 14 1 sides of movable contact 1).At this moment, the 1st conductor 4a moving contact 2 all be positioned at during with the contact closure condition of fixed contact 3 contact this contact contact-making surface above, and, when disconnecting, also be positioned at the top of movable contact 1 in the contact.

Below, further describe the connection structure of above-mentioned movable contact 1 and said fixing contact 4.

At first, fixed contact 4 slightly is the U word shape by whole formation of the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d, and the joint 5 of power end and an end of this U font are that the power-supply system of above-mentioned the 1st conductor 4a end of holding of continuing is connected.In addition, the inboard that fixed contact 3 is fixed on the U word shape of the other end relative with it is the upper surface of above-mentioned the 2nd conductor 4e.On said fixing contact 4, on the bonding conductor above the stationary plane that is positioned at said fixing contact 3 (the 1st conductor 4a and the 3rd conductor 4d), also be provided with slit 40, shown in Figure 126～Figure 128.

This slit 40 is provided with for the switch motion that does not hinder the fixed contact 3 on above-mentioned relatively the 2nd conductor 4e of movable contact 1.

In the altitude range of the 3rd conductor 4d of such fixed contact 4, the center of rotation 14 of movable contact 1 is configured in the foreign side position relative with the above-mentioned slit 40 of the 3rd conductor 4d.Like this, above-mentioned movable contact 1 just can rotate in the switch direction of contact by above-mentioned slit 40.

In addition, two blocks of arc extinguishing side plates 7 about the both sides, inside of the above-mentioned slit 40 of said fixing contact 4 are provided with.Track plane during with above-mentioned movable contact 1 switch motion is clipped in the middle these two blocks of arc extinguishing side plates 7 in the both sides, inside of above-mentioned slit 40, and keeps such interval, is parallel to each other, and stands in the top of the 1st conductor 4a with the state of this parallel interval.

In the fixed contact 4 that this arc extinguishing side plate 7 is set, the inner surface of the slit 40 of the 1st conductor 4a and the upper surface portion that is positioned at arc extinguishing side plate 7 outside lefts on above-mentioned the 1st conductor 4a surface with moving contact 2 is separated by above-mentioned arc extinguishing side plate 7.The part of the 1st conductor 4a that remaining is seen from the surface of moving contact 2 is the inner surface and upper surface insulant 15 coatings of slit 40 close contact 5 one sides on the 1st conductor 4a.This insulant 15 is made of the insulant 15a of the upper surface that covers the 1st conductor 4a and the insulant 15b of the inner surface that covers slit 40.

In Figure 124 and Figure 125, driving mechanism shown in Figure 18 and operating grip 9 etc. have been omitted.

Below, its action is described.

When big electric current such as short circuit current flow, movable contact 1 does not wait for that the action of driving mechanism just begins to rotate, and moving contact 2 is separated with fixed contact 3, simultaneously, produces electric arc A between contact 2,3, and these are all the same with situation about having earlier.

Figure 129 is the action specification figure of state after has just separated the contact, and Figure 130 is the profile along the A-A line of Figure 129.Under the state after has just separated this contact, the contact-making surface of moving contact 2 also is in the below of the 1st conductor 4a of fixed contact 4.Among the figure, arrow is represented electric current.

Under this state, the current path that 4 the 1st conductor 4a constitutes from joint 5 to fixed contact is positioned at the top of electric arc A entirely.As a result, the electromagnetic force to electric arc A effect of this current path generation is exactly the active force that electric arc A is stretched to joint 5 directions.

In addition, flow through the electric current of the 3rd conductor 4d of fixed contact 4 and the current opposite in direction of electric arc A, so flowing through the electromagnetic force that the electric current of above-mentioned the 3rd conductor 4d produces also is the active force that stretches to joint 5 directions.

Therefore, the electromagnetic force that flows through the electric current generation of said fixing contact 4 all is the directed force F m that electric arc A is stretched to joint 5 directions, and the result can obtain very strong electric arc driving magnetic field.

In the present embodiment, shown in Figure 130 like that, about the electric arc A that produces between moving contact 2 and the fixed contact 3 is sandwiched between two blocks of arc extinguishing side plates 7.Therefore, electric arc A can not expand to both sides, has limited the sectional area of this direction.On the other hand, shown in Figure 129 like that because the forceful electric power magnetic force Fm that points to joint 5 directions is to electric arc A effect, so the electric arc A between movable contact 2 and the fixed contact 3 also is difficult to expand to the rightabout of joint 5.

That is to say, utilize the barrier of electro permanent magnetic to promote the restriction of the sectional area of 7 couples of electric arc A of arc extinguishing side plate effectively.In addition, because the part that contacts with arc extinguishing side plate 7 loses heat, so electric arc A is cooled off.As mentioned above, owing to arc extinguishing side plate 7 electric arc A is clipped in the middle, so the pressure in the zone that electric arc takes place rises, and pushes moving contact 2 forcibly by this pressure, thereby can increase the opening speed of movable contact 1.

As a result, the electric arc A of contact after just having separated stretched consumingly, and sectional area is cooled after being restricted, and simultaneously, the distance between the contact 2,3 also promptly increases, so arc voltage raises sharp.

Figure 131 is the end view of the movable contact among Figure 129 when reaching maximum off-state.In the such large-current electric arc of short circuit current, the metal vapors stream from the electric arc root of contact surface along the vertical direction ejection contact evaporation of contact surface, it is now know that, and this steam flow is the main composition thing of electric arc A.

Shown in Figure 131 like that owing to insulate in the face of the 1st conductor 4a on the surface of moving contact 2 is insulated thing 15, so, run into behind the insulant 15 and be cooled from the metal vapors of the surface ejection of moving contact 2, thereby can improve arc voltage.

In addition, for the electric arc A of the 1st conductor 4a of fixed contact 4 below, the electromagnetic force Fm that has strong electric arc driving magnetic field to produce remakes usefulness, and in slit 40 parts of the 1st conductor 4a, as described below, also there is the electric arc driving magnetic field.

Figure 132 is along the profile of the B-B line of Figure 131, has omitted arc extinguishing side plate 7 among the figure.Among the figure, the 41st, the center of the 1st conductor 4a of slit 40 left and right sides and each section of the 2nd conductor 4e.

Figure 133 is the magnetic field distribution figure of magnetic field on the Z of Figure 132 axle that produces according to the electric current that flows through fixed contact 4 that Theoretical Calculation is obtained, and the magnetic field of positive direction is to magnetic-field component that joint 5 directions stretch (below, be called the electric arc driving magnetic field) with electric arc A.

Shown in Figure 132 like that, the 1st conductor 4a is positioned at the position, the left and right sides of the rotational plane that departs from movable contact 1.

In this conductor arrangement, owing to flow through the influence of the electric current of the 2nd conductor 4e and the 3rd conductor 4d, shown in Figure 133, there is the electric arc driving magnetic field that electric arc A is stretched to joint 5 directions in ZO up to the upper space zone of the 1st conductor 4a.

Therefore, electric arc A is subjected to pointing to the forceful electric power magnetic force of joint 5 directions from the top in the somewhere of fixed contact 3 to the 1st conductor 4a, and the insulant 15b that is extruded to the inner surface that covers slit 40 goes up and is cooled.As a result, after just separated the contact, sharply the arc voltage that raises further increased, and can keep high arc voltage, so, the energy that can reduce current peak and pass through, thus can obtain having the circuit-breaker of good current limiting performance.

In addition, as present embodiment 56, if make moving contact 2 under off-state, can not arrive arc extinguishing side plate 7 above, even then moving contact 2 reaches the top of the 1st conductor 4a of fixed contact 4, be in maximum off-state, the electric arc A of the 1st conductor 4a top also is sandwiched in the centre of arc extinguishing side plate 7, so, to this part electric arc A, the sectional area of the also restricted electric arc A of arc extinguishing side plate 7 and the effect of cooling, in addition, because the pressure of the following side space of movable contact 1 also rises, and movable contact 1 is used the power that pushes away, so, the opening speed of movable contact 1 can not reduce, thereby can further improve current limiting performance.

Embodiment 57:

Figure 134 is the end view of electrode of the circuit-breaker of the embodiment of the invention 57.In present embodiment 57, the electric current that flows through the 2nd conductor 4e part when being in closure state is in fact substantially parallel oppositely with the electric current that flows through movable contact 1.

When adopting such structure, the current path of the 2nd conductor 4e electric arc A is increased to the electromagnetic force that joint 5 directions stretch, and, when closure state, between the 2nd conductor 4e of movable contact 1 and fixed contact 4, act on electromagnetic repulsive force, so the velocity of rotation of movable contact 1 increases, the arc length after has just separated the contact increases rapidly, thereby arc resistance sharply increases, and further improves current limiting performance.

In addition, as present embodiment 57(Figure 134), make the electric current of the 1a portion of when closure state, flowing through movable contact 1 in fact be positioned at fixed contact 4 the 1st conductor 4a below, then the sense of current of the 1st conductor 4a of the 1a portion of movable contact and fixed contact 4 is identical, attract each other, so, the velocity of rotation of movable contact 1 is accelerated.As a result, the contact spacing that disconnects the initial stage is from being that arc length increases very soon, thereby improved current limiting performance.

Embodiment 58:

Figure 135 (a) is the end view of electrode of the circuit-breaker of embodiment 58, and Figure 135 (b) is the front elevation that Figure 135 (a) omits movable contact.

Present embodiment 58 is characterised in that the shape of the insulant 15 of the 1st conductor 4a that covers fixed contact 4.

That is, the insulant 15 of present embodiment 58 is made of insulant 15a, inner face insulant 15b and the prolongation insulant 15c that hangs down, and insulant 15a arrives the surface coverage of the 1st conductor 4a near the top (near the slit end of joint 5 one sides) of slit 40; Inner face insulant 15b covers the inner surface of the slit 40 between the both sides arc extinguishing side plate 7; The prolongation insulant 15c that hangs down continues the part of prolongation downwards with inner face insulant 15b.

When constituting insulant 15 like this, the electric arc A of the 1st conductor 4a below, the high-intensity magnetic field of the contact 4 that is fixed and the arc extinguishing side plate 7 of the right and left and hang down and prolong insulant 15c from completely encircle, so, the sectional area of electric arc A is very little, and the cooling effect of arc extinguishing side plate 7 and insulant 15c is also very high.In addition, after just separated the contact, three of the following side spaces of the 1st conductor 4a were enclosed, so pressure also rises easily, along with pressure rises, the active force that movable contact 1 is upwards pushed away increases, thereby also improves opening speed.

Embodiment 59:

Figure 136 is the end view of electrode of the circuit-breaker of embodiment 59.

Present embodiment 59 is characterised in that the front end 1b of movable contact 1 when reaching maximum off-state reaches the top of arc extinguishing side plate 7.

When adopting such structure, when little failures of current such as load current, electric arc A rises the pressure in the space between the arc extinguishing side arc plate 7, so, near the moving contact 2 electric arc A are subjected to direction and point to pressure Fp outside the arc extinguishing side plate 7, make the root of the electric arc A on the moving contact 2 move to the front end 1b of movable contact 1 easily.As a result, the consumption of the moving contact 2 that electric arc A causes reduces, and, owing to increased the length of electric arc A, so, the cut-out performance can be improved.

Embodiment 60:

Figure 137 is the end view of electrode of the circuit-breaker of embodiment 60.

Present embodiment 60 is characterised in that the shape of arc extinguishing side plate 7.The arc extinguishing side plate 7 of present embodiment 60, the rising limit 7a that makes the 1st conductor 4a top that is positioned at fixed contact 4 when maximum off-state than center of rotation 14 1 sides of moving contact 2 more close movable contacts 1, and a part of 15d that the upper surface of the 1st conductor 4a that will the moving contact 2 when disconnecting sees is insulated thing 15 insulate.

When adopting such structure, when movable contact 1 reaches maximum off-state, above the 1st conductor 4a, because the effect of the pressure Fp in the space between the arc extinguishing side plate 7, electric arc A will be blown to the space that is provided with arc extinguishing side plate 7, the space of promptly more close joint 5 one sides.In addition, add the pressure effect of the following side space of the 1st conductor 4a, thereby electric arc A is stretched.As a result, the arc length of the 1st conductor 4a top increases, and arc voltage also increases, so current limiting performance improves.

In addition, between two blocks of arc extinguishing side plates 7 above the 1st conductor 4a, do not have electric arc A in long-time, so the damage to arc extinguishing side plate 7 that electric arc A causes is few, and the insulation disruptive strength on surface also seldom reduces.

Therefore, be difficult to cause insulation breakdown, thereby also can improve the cut-out performance by the surface of the arc extinguishing side plate 7 between moving contact 2 and the fixed contact 3.

Embodiment 61:

Figure 138 (a) is the end view of electrode of the circuit-breaker of embodiment 61, and Figure 138 (b) is the profile along the C-C line of Figure 138 (a).

In present embodiment 61, with the top protuberance of arc extinguishing side plate 7 form make movable contact 1 moving contact 2 be not between the above-mentioned arc extinguishing side plate 7 when the maximum off-state, in illustrated example, protuberance forms rake 7b above above-mentioned arc extinguishing side plate 7.

Like this, since when maximum off-state moving contact 2 be projected into arc extinguishing side plate 7 above, so, contact in order making, on above-mentioned insulant 15, to be provided with the 15d part of the slit 40 both sides upper surfaces of covering the 1st conductor 4a with the upper surface of the 1st conductor 4a in these arc extinguishing side plate 7 outsides from the metal vapors stream of moving contact 2 ejection.

In the process that disconnects, movable contact 1 passes through from the next door of the 1st conductor 4a, so the influence of being flow through the electromagnetic force that the electric current of the 1st conductor 4a produces is very big, simultaneously, also is subjected to the pressure effect of the following side space of the 1st conductor 4a.Therefore, because a little of pressure and electromagnetic force is unbalanced, on Figure 138 (b), movable contact 1 will swing in the process that disconnects, thereby moving contact 2 might contact with the arc extinguishing side plate 7 on the left side or the right when disconnecting.Reduce very greatly with the insulation disruptive strength on the surface of the contacted arc extinguishing side plate 7 of electric arc A, so, on-insulated between moving contact 2 and the fixed contact 3 under moving contact 2 and arc extinguishing side plate 7 state of contact, so the danger that can not cut off circuit is very big.In addition, even moving contact 2 does not contact with arc extinguishing side plate 7 when disconnecting, if the insulation distance between moving contact 2 and the arc extinguishing side plate 7 is short, also can insulation breakdown take place by the surface of arc extinguishing side plate 7 between moving contact 2 and the fixed contact 3, thereby can not obtain to cut off reliably performance.

But according to the foregoing description 61, moving contact 2 is not between the arc extinguishing side plate 7 under off-state, so even movable contact 1 swings, moving contact 2 can not contact with arc extinguishing side plate 7 yet.In addition, can also increase insulation distance between moving contact 2 and the arc extinguishing side plate 7.Therefore, do not have the above-mentioned danger that can not cut off circuit, improved current limiting performance and cut off performance.

Figure 139 is the end view of circuit-breaker with arc extinguishing side plate variation of embodiment 61.

The arc extinguishing side plate 7 of this variation makes since center of rotation 14 1 sides of the most close movable contact 1 of elevated portion of the 1st conductor 4a, and movable contact 1 is between the arc extinguishing side plate 7 when off-state, and moving contact 2 is not between the arc extinguishing side plate 7.

When adopting such structure, because moving contact 2 is not between the arc extinguishing side plate 7 when off-state, so, can obtain the effect identical with embodiment 61.In addition and since when off-state on the movable contact 1 position than moving contact 2 more close center of rotation 14 1 sides be between the arc extinguishing side plate, so pressure Fp will increase the active force to joint 5 directions stretchings with electric arc A.

Embodiment 62:

Figure 140 is the end view of the circuit-breaker of embodiment 62, and Figure 141 is the front elevation of Figure 140, in Figure 141, has omitted the movable contact 1 among Figure 140.

In present embodiment 62, the top edge of arc extinguishing side plate 7 is no more than the altitude range of fixed contact 4.In addition, on insulant 15, be provided with the insulant 15d of the slit 40 both sides upper surfaces that cover when being in off-state the 1st conductor 4a that can touch from the metal vapors stream of moving contact 2 ejections.

Adopt such structure, after just disconnecting, electric arc A is also with recited above such, because high arc voltage can take place for the effect of arc extinguishing side plate 7 and the effect of electric arc driving magnetic field.

That is to say, when moving contact 2 escape to the top of the 1st conductor 4a, compare with the pressure of the following side space of the 1st conductor 4a, the superjacent air space of the 1st conductor 4a is not between the arc extinguishing side plate 7 owing to electric arc A, pressure does not raise, as a result, electric arc A is stretched upward owing to the above-mentioned effect of the pressure Fp of side space down.In addition, because the effect upward easily of the pressure of the following side space of the 1st conductor 4a, and the area of arc extinguishing side plate 7 (compression area) is very little, so the power that acts on this arc extinguishing side plate 7 is little, the mechanical strength of arc extinguishing side plate 7 needn't be too big.

In addition, as previously mentioned, after blowing on the insulant 15 that covers the 1st conductor 4a, the metal vapors of moving contact 2 ejection is cooled.At this moment, owing to above the 1st conductor 4a, do not have arc extinguishing side plate 7, so the insulant 15d direction above the metal vapors of moving contact 2 ejection also can blow to slit 40 both sides of the 1st conductor 4a can only not concentrate on the insulant 15a of close joint 5 one sides that cover slit 40.

Therefore, electric arc A is very little to the damage of insulant 15a.In addition, owing to be subjected to the electromagnetic force effect of fixed contact 4, the insulant 15b that is extruded to slit 40 close joint 5 one sides of the 1st conductor 4a goes up and is cooled off forcibly, so, the same with the foregoing description, can keep high arc voltage.And even movable contact 1 swings in off-state, moving contact 2 does not reach the arc extinguishing side plate yet, so, the above-mentioned situation that can not cut off circuit can not take place.

Figure 142 is the end view of circuit-breaker of the variation of embodiment 62.

In this variation, because the upper end of the arc extinguishing side plate 7 of the foregoing description 62 is no more than the altitude range of fixed contact 4, so, the easy superjacent air space that arc extinguishing board 6 is configured to the 1st conductor 4a of this fixed contact 4, behind the configuration arc extinguishing board 6, can further improve the cut-out performance like this.

Embodiment 63:

Figure 143 is the end view of electrode of the circuit-breaker of embodiment 63.

In present embodiment 63, be provided with arc extinguishing side plate 7 to such an extent that the space of close joint 5 one sides in the 1st conductor 4a below of fixed contact 4 is not clipped between the arc extinguishing side plate 7.In addition, the arc extinguishing side plate 7 of present embodiment 63 forms the right angle with the end 7e of joint 5 one sides.

According to present embodiment 63, because the space is clipped between the arc extinguishing side plate 7 near fixed contact 3 under disconnection initial stage or the illustrated off-state, so, pressure rises, under the effect of this unlifting pressure Fp, electric arc A stretches to joint 5 one laybacks, thus can improve the rate of climb that disconnects initial arc voltage or when disconnecting electric arc A driven and improved arc voltage to insulant 15b consumingly.

Figure 144 is the electrode end view of circuit-breaker of the variation of embodiment 63, in this variation, the end 7e of joint 5 one sides of arc extinguishing side plate 7 is formed as shown in the figure tilted shape, can obtain the effect identical with embodiment 63.

Embodiment 64:

Figure 145 (a) is the end view of electrode of the circuit-breaker of embodiment 64, and Figure 145 (b) is the front elevation of Figure 145 (a).

Present embodiment 64 is the same with the situation of the foregoing description 62～embodiment 63, be no more than in the circuit-breaker of altitude range of fixed contact 4 at arc extinguishing side plate 7, insulant 15b near the inner surface of joint 5 one sides prolongs downwards with the slit 40 that covers the 1st conductor 4a, and forming hangs down prolongs insulant 15c.

According to present embodiment 64, because the electric arc A of the 1st conductor 4a below is subjected to pointing to the forceful electric power magneticaction of joint 5 directions,, upward cooled off forcibly electric arc A so being extruded to the prolongation insulant 15c that hangs down of insulant 15, improved cooling effect.In addition, owing to the 1st conductor 4a is blocked from joint 5 directions by above-mentioned insulant 15c, so the restriction effect of 7 pairs of electric arc sectional areas of arc extinguishing side plate of both sides is more effective.

Embodiment 65:

Figure 146 (a) is the end view of electrode of the circuit-breaker of embodiment 65, and Figure 146 (b) is the profile along the D-D line of Figure 146 (a).

In present embodiment 65, make the upper end of arc extinguishing side plate 7 be no more than the altitude range of fixed contact 4, and the lower end of this arc extinguishing side plate 7 is positioned at the below of fixed contact 3.

By the arc extinguishing side plate 7 of such formation, at the illustrated disconnection initial stage, the space below the 1st conductor 4a of fixed contact 4, the pressure that is produced by the living heat of electric arc A can not leak from the downside of above-mentioned arc extinguishing side plate 7, and therefore, pressure raises.As a result, the pressure that upwards pushes movable contact 1 increases, thereby can increase the opening speed of disconnection initial stage movable contact 1.

In addition, as previously mentioned, at the following side space of the 1st conductor 4a of fixed contact 4, very strong to the electromagnetic force of joint 5 directive effects, so, electric arc A can not be center of rotation 14 motion on one side of movable contact 1 round about, and, as embodiment 10, because pressure can not leak from the downside of arc extinguishing side plate 7, so, electric arc A is very big to the power of joint 5 directions extruding.Under the effect of this power, electric arc A stretches very longly to joint 5 directions, and the initial stage rate of climb of arc voltage is very big, in addition, when disconnecting, only become the active force to the inner surface insulant 15b of insulant 15 extruding with electric arc A, so, also improved cooling effect.

Figure 147 (a) is the electrode end view of circuit-breaker of the variation of Figure 146 (a) and Figure 146 (b), and Figure 147 (b) is the profile along the E-E line of Figure 147 (a).

In this variation, the lower end of arc extinguishing side plate 7 is contacted with the upper surface of the 2nd conductor 4e, simultaneously, the width that makes the 2nd conductor 4e is greater than the interval between the above-mentioned arc extinguishing side plate 7.Can prevent that like this, just pressure from leaking from above-mentioned arc extinguishing side plate 7 lower ends.

Embodiment 66:

Figure 148 is the end view of electrode of the circuit-breaker of embodiment 66, and Figure 149 is the profile along the F-F line of Figure 148.

Opposite with the situation of the foregoing description 65 in present embodiment 66, make the lower end of arc extinguishing side plate 7 be positioned at the top of fixed contact 3.That is, between the 2nd conductor 4e of the lower end of both sides arc extinguishing side plate 7 and fixed contact 4, leave gap S.

By adopting such structure, the pressure of side space can leak from the gap S of arc extinguishing side plate 7 lower ends under the 1st conductor 4a of fixed contact 4, therefore, can suppress the above-mentioned pressure of side space down and rise.As a result, the pressure that acts on the arc extinguishing side plate 7 reduces, thereby can reduce arc extinguishing side plate 7 necessary mechanical strength.In addition, even the insulation disruptive strength on arc extinguishing side plate 7 surfaces is little when failure of current, attempt to puncture between fixed contact 3 and the moving contact 2 by the surface of arc extinguishing side plate 7, also because the insulation distance between moving contact 3 and the arc extinguishing side plate 7 has been increased, so insulation breakdown can not take place, improve the cut-out performance.

Figure 150 is the electrode end view of circuit-breaker of the variation of embodiment 66.In this variation,, make the distance between the lower end of fixed contact 3 and arc extinguishing side plate 7 big more the closer to joint 5 one sides by arc extinguishing side plate 7 is formed hypotenuse 7f near a side of fixed contacts 3.

Because the effect of the electromagnetic force that fixed contact 4 produces, electric arc A is to joint 5 one side shiftings, so electric arc A is big in joint 5 one sides to the damage of arc extinguishing side plate 7.Therefore, the insulation disruptive strength on arc extinguishing side plate 7 surfaces of joint 5 one sides reduces easily.

Therefore, if adopt the such structure of this variation, worsen few part at arc extinguishing side plate 7 surface insulations, the lower end of arc extinguishing side plate 7 is near the height of fixed contact 3, can bring into play the electric arc cooling effect and the sectional area restriction effect of arc extinguishing side plate 7 to greatest extent, and the lower end of the big arc extinguishing side plate 7 of degradation of insulation on surface is higher than fixed contact 3 far away, insulation distance is very big, so, can improve current limiting performance and cut off performance.

Embodiment 67:

Figure 151 is the end view of electrode of the circuit-breaker of embodiment 67, and Figure 152 is the profile along the G-G line of Figure 151.

In present embodiment 67, in close joint 5 one sides and a side opposite, distance (hereinafter referred to as the amplitude) difference between the both sides arc extinguishing side plate 7 with it.

Promptly, between the arc extinguishing side plate 7 of both sides, shown in Figure 152, make the part relative form narrow 70a with the track that disconnects when action moving contact 2, than the part formation fabric width portion 70b of this narrow 70a near joint 5 one sides, if the width of above-mentioned narrow 70a is L, the width of the above-mentioned fabric width 70b of portion is M, then L＜M.

When constituting arc extinguishing side plate 7 like this, because what taken place between the contact 2,3 after just having disconnected does not reach in the narrow space of above-mentioned narrow 70a that little arc current A before the big electric current is in arc extinguishing side plate 7, so, be subjected to the action effect of arc extinguishing side plate 7 as described above easily.Because the effect of the hard arc driving magnetic field of this action effect and fixed contact 4, arc voltage rises very soon.

When movable contact 1 further disconnected, the electric arc A that is clipped in the 1st conductor 4a below of the pressure Fp in the space between the both sides arc extinguishing side plate 7 and the fixed contact 4 hard arc driving magnetic field that contact 1 produces that is fixed further drove in the space between the 70b of fabric width portion of arc extinguishing side plate 7.In case electric arc A enters the space between the 70b of fabric width portion of above-mentioned arc extinguishing side plate 7, electric arc A just is difficult to get back to from the 70b of this fabric width portion the space of above-mentioned narrow 70a.As a result, electric arc A is easy to be elongated, and keeps this state easily, so, high arc voltage can take place and keep.

In addition, following side space at the 1st conductor 4a, when electric arc A is in space between the 70b of fabric width portion of arc extinguishing side plate 7, because this space is big, pressure rises little, and the distance of the 70b of fabric width portion from electric arc A to above-mentioned arc extinguishing side plate 7 also increases, so the damage on the surface that the 70b of fabric width portion of above-mentioned arc extinguishing side plate 7 contacts with electric arc A is also few.As a result, can relax the requirement of the condition of the mechanical strength of arc extinguishing side plate 7 and arc resistance.

Figure 153 is the end view of electrode of circuit-breaker of the variation of embodiment 67, and Figure 154 is the plane graph of Figure 153.This variation is the situation that the height of the arc extinguishing side plate 7 of the foregoing description 67 is changed into the 1st conductor 4a that is no more than fixed contact 4, can obtain the effect identical with the foregoing description 67.

Embodiment 68:

Figure 155 is the end view of electrode of the circuit-breaker of embodiment 68, and Figure 156 is the profile along the H-H line of Figure 155.

In present embodiment 68, narrow 70a of arc extinguishing side plate 7 is opposite with the situation of above-mentioned embodiment 67 with the 70b of fabric width portion.

That is, shown in Figure 156, the part of the arc extinguishing side plate 7 that the track of moving contact 2 is relative in the time of will moving with disconnection forms the fabric width 70b of portion, and will be than the 70b of this fabric width portion part formation narrow 70a near the above-mentioned arc extinguishing side plate 7 of joint 5 one sides.

Like this, the electric arc A of side space is subjected to the electromagnetic force Fm of the hard arc driving magnetic field that fixed contact 4 produces under the 1st conductor 4a of fixed contact 4.Therefore, the electric arc A of broad space just is extruded narrow space between narrow the 70a of into above-mentioned arc extinguishing side plate 7 between the 70b of fabric width portion that is in arc extinguishing side plate 7 that takes place between the contact 2,3.

By, because the pressure of narrow space is big, be difficult to electric arc is remained on narrow space.

But, as the present invention, when having the electromagnetic force Fm of very big electric arc driving magnetic field, just electric arc A can be expressed to the narrow space between narrow the 70a of above-mentioned arc extinguishing side plate 7 at the beginning.The electric arc A that is extruded to this narrow space further is subjected to the action effect of arc extinguishing side plate 7 as described above, so, high arc voltage can take place.

Figure 157 is the end view of electrode of circuit-breaker of the variation of embodiment 68, and Figure 158 is the plane graph of Figure 157.

In the present embodiment, make the height of arc extinguishing side plate 7 be no more than the 1st conductor 4a of fixed contact 4.In addition, shown in Figure 158 like that, above-mentioned arc extinguishing side plate 7 is an overall structure, on this arc extinguishing side plate 7, form the otch 70 of a horizontal convex, form the 70b of fabric width portion and narrow 70a continuously by this otch 70, under the situation of this structure, also can obtain same effect.

Figure 159 is the go out plane graph of fixed contact of plate side plate of other variation with embodiment 68, in this variation, the side that narrow 70a of the arc extinguishing side plate 7 shown in Figure 158 formed near joint 5 is sharp-pointed gradually V-shape, at this moment, can obtain the effect identical with embodiment 68.

Figure 160 is the plane graph of fixed contact with other variation arc extinguishing side plate of embodiment 68, in this variation, opposite with the situation of Figure 159, narrow 70a of arc extinguishing side plate 7 formed a shape that width increases gradually near joint 5, at this moment also can obtain same effect.

Figure 161 (a) is the electrode end view of circuit-breaker of the variation of embodiment 68, and Figure 161 (b) is the profile along the I of Figure 161 (a)-I line, and Figure 161 (c) is the plane graph of Figure 161 (a).

In this variation, narrow 70a of arc extinguishing side plate 7 is formed on the top of joint 5 one sides, this situation also can obtain same effect.

Arc extinguishing side plate 7 of the present invention and insulant 15 can use inorganic or the organic insulation material.When using the inorganic insulation thing, can reduce damage with the electric arc contact-making surface.In addition, when using organic insulation substrate, the face that contacts with electric arc will discharge a large amount of decomposition gases, and will be very big to the cooling effect of electric arc.In organic insulation substrate, melamine phenol series can also discharge arc extinguishing gas, and the surface degradation of insulation can not take place, so, if the organic substance with melamine phenol series constitutes arc extinguishing side plate 7 or insulant 15, can further improve current limiting performance and cut off performance.

Embodiment 69:

Below, with reference to description of drawings embodiment 69.Figure 162 is the switch as embodiment 69, and the end view of arc extinguishing part when the circuit-breaker of representing on the section of container is in closure state, Figure 163 are the end view of the circuit-breaker of Figure 162 when becoming off-state.

The structure of present embodiment is except the connection structure of movable contact 1 and fixed contact 4, and is identical with the various embodiments described above, so explanation is omitted.

Said fixing contact 4 is installed on the container 12, but makes the 3rd conductor 4d be positioned at the other end of not fixing moving contact 2 of the position of fixed contact 3 near movable contact 1, and is positioned at opposite one side (rotating fulcrum 14 1 sides of movable contact 1) of above-mentioned joint 5.At this moment, the 1st conductor 4a moving contact 2 all be positioned at during with the contact closure condition of fixed contact 3 contact this contact contact-making surface above, and be positioned at when disconnecting in the contact moving contact 2 contact-making surface below.

Wherein, the joint 5 that is connected with fixed contact 4 is positioned at the top of the contact-making surface of fixed contact 3.

In addition, the 2nd conductor 4e that utilizes the 1st conductor 4a and the 3rd conductor 4d will fix the fixed contact 3 of fixed contact 4 is connected with joint 5.The 1st conductor 4a all is positioned at the top of the contact-making surface of fixed contact 3, and the 3rd conductor 4d and the 1st conductor 4a are being connected than the position of fixed contact 3 side near rotating fulcrum 14.

The 16th, arc extinguishing board, this arc extinguishing board 16 is configured in the below of the 1st conductor 4a.For the contact of the rotation that do not hinder movable contact 1 and moving contact 2 and fixed contact 3, separate, this arc extinguishing board 16 is provided with otch 16a(referring to Figure 170).

By Figure 170 as can be known, the otch 16a of above-mentioned arc extinguishing board 16 can form different shape.

On the arc extinguishing board 16 of another side, also be provided with otch (not shown) for the rotation that does not hinder above-mentioned movable contact 1.In Figure 162 and Figure 163, omitted the driving mechanism 8 in the circuit-breaker that has earlier shown in Figure 1 and the joint 10 of handle 9 and load end, certainly, these parts all are contained in the container 12.

Figure 164 (a) and (b) are oblique views of the fixed contact of embodiment 69.Fixed contact 4 shown in Figure 164 (a) integrally forms the shape that slightly is the U font by the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d, and the joint 5 of power end and an end of this U font are that the continue end of end of the power supply of above-mentioned the 1st conductor 4a is connected.In addition, to be fixed on the inboard of its opposite one end U font be the upper surface of above-mentioned the 2nd conductor 4e to fixed contact 3.On said fixing contact 4, on the bonding conductor above the stationary plane that is positioned at said fixing contact 3 (the 1st conductor 4a and the 3rd conductor 4d), also be provided with slit 40 for the switch motion that does not hinder the fixed contact 3 on movable contact 1 relative the 2nd conductor 4e.

In Figure 164 (b), the 15th, insulant, this insulant 15 covers the 3rd conductor 4d with the surface of said fixing contact 4 and the inner surface of above-mentioned slit 40 near the junction of the 1st conductor 4a and joint 5.

Below, its action is described.

When big electric current such as short circuit current flow, movable contact 1 does not wait for that the action of driving mechanism just begins to rotate, and moving contact 2 and fixed contact 3 are separated, and simultaneously, electric arc A takes place between the contact 2,3, and these are all identical with situation about having earlier.

Figure 165 represents the state of above-mentioned contact 2,3 after just having separated.Among the figure, arrow is represented electric current, for simplicity, has omitted arc extinguishing board 6 and 16.

Figure 166 is the action specification figure that the movable contact 1 of the circuit-breaker of Figure 162 reaches maximum off-state.The current path that 4 the 1st conductor 4a constitutes from joint 6 to fixed contact all is positioned at the top of electric arc A.As a result, the electromagnetic force to electric arc A effect of this current path generation is exactly the active force that electric arc A is stretched to joint 5 directions.The electric current that the electric current relative current that flows through the 3rd conductor 4d is crossed movable contact 1 is positioned at vertical direction, flow through the electric current of the 3rd conductor 4d of fixed contact 4 and the current opposite in direction of electric arc, so the electromagnetic force that flows through the electric current generation of the 3rd conductor 4d also is the active force that electric arc is stretched to joint 5 directions.

Therefore, flowing through the electromagnetic force that the electric current of fixed contact 4 produces all is the active force that electric arc is stretched to joint 5 directions.As a result, the electric arc after contact has just been separated is stretched consumingly, is cooled off by arc extinguishing board 16 simultaneously, so arc resistance increases sharp.

Figure 167 (a) is that Figure 167 (b) is the profile along the A-A line of Figure 167 (a) for the movable contact shown in the distribution of the magnetic field intensity that the electric current generation of flowing through fixed contact is described and the end view of fixed contact.

Among the figure, the 41st, each section center of the 1st conductor 4a of slit 40 left and right sides.

Figure 167 (c) is the magnetic field distribution figure of magnetic field on the Z axle of Figure 167 (b) that produces according to the electric current that flows through fixed contact 1 that Theoretical Calculation is obtained, the magnetic field of positive direction is to magnetic-field component that joint 5 directions stretch (below, be called the electric arc driving magnetic field) with electric arc.

Shown in Figure 167 (b), the 1st conductor 4a is positioned at the position, the left and right sides of the rotational plane that departs from movable contact 1.

In such conductor arrangement,, all there is the magnetic-field component that electric arc A is stretched to joint 5 directions up to the space on the 1st conductor 4a top (regional ZO) owing to flow through the influence of the electric current of the 2nd conductor 4e and the 3rd conductor 4d.Therefore, even as Figure 166, moving contact 2 turns to the top of the 1st conductor 4a, slit 40 parts at the 1st conductor 4a, electric arc A also is subjected to the power to joint 5 directive effects, and is extruded to the insulant 15a that covers above-mentioned slit 40 tops (slit 40 is near the end inner surfaces of joint 5 one sides) part and goes up and cooled off.As a result, the arc resistance that sharply rises after just separate the contact further increases, thereby can keep high arc voltage, so, the energy that can reduce current peak and pass through, thus the good circuit-breaker of current limiting performance can be obtained.

Embodiment 70:

In Figure 162, by constitute above-mentioned arc extinguishing board 16 with magnetic, promptly flow through in the cut-out action in the zone that the current value of fixed contact 4 is little and magnetic field that this electric current produces is also little in zones such as rated current and overcurrent, can strengthen the contact just separated after to the driving magnetic field of electric arc, the electric arc that is stretched is cooled off at once, so, can obtain good cut-out performance to the electric current of wide range.

Embodiment 71:

In Figure 162,, can not upset the electric arc driving magnetic field of the 1st conductor 4a below, thereby can drive and cool off electric arc by constitute above-mentioned arc extinguishing board 16 with nonmagnetic material.Particularly, better when using the metal formation arc extinguishing board 16 of nonmagnetic material to the cooling effect of electric arc, so, can obtain high arc voltage.

Embodiment 72:

In Figure 162, as Figure 168, will dispose more than 1 by the arc extinguishing board 16 that insulant constitutes, the electric arc A that the contact has been stretched after just having separated is squeezed into waveform forcibly, electric arc is further prolonged, thereby can obtain high arc voltage.

In the foregoing description 69～72, arc extinguishing board 16 also can use Figure 171 (a) and the such bar-shaped object of Figure 171 (b).At this moment, for the contact of the rotation that do not hinder movable contact 1 and contact 2,3, separate, also adopt the configuration mode identical with above-mentioned situation.Effect is identical with the foregoing description 69～72.

In addition, like that the 2nd conductor 4e is extended to rotating fulcrum 14 directions shown in also can image pattern 169, the 2nd conductor 4e that replaces the fixed contact of fixing fixed contact 43 shown in the foregoing description 69～72, the electric current that flows through movable contact 1 when making the electric current that flows through the 2nd conductor 4e and closure state is substantially parallel oppositely.Like this, just can increase the active force that electric arc is stretched to joint 5 directions that current path 4e produces, in addition, between the 2nd conductor 4e of movable contact 1 and fixed contact 4, act on electromagnetic repulsive force when closed, so the velocity of rotation of movable contact 1 increases, arc length after has just separated the contact increases sharp, so arc resistance rises rapidly, further improve current limiting performance.

In addition, in the foregoing description 69～72, the situation of circuit breaker has been described, still, also can have obtained the effect identical with the foregoing description 69～72 for other switch.

Embodiment 73:

Below, with reference to description of drawings embodiments of the invention 73.Figure 172 is the switch as embodiment 73, and the end view of arc extinguishing part when the circuit-breaker that container is cut open is in closure state, Figure 173 are the end view of the circuit-breaker of Figure 172 when becoming off-state.

Among the figure, the 4th, fixed contact is made of the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d, on above-mentioned the 2nd conductor 4e, has fixed contact 3.

Be elaborated below, under the contact closure condition of Figure 172, when if the direction that the movable contact 2 of movable contact 1 leaves from fixed contact 3 is the top, said fixing contact 4 integrally forms the shape that is made of the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d, the 1st conductor 4a connects the joint 5 of power-supply system, extends to horizontal direction; The 2nd conductor 4e is positioned at the below of the 1st conductor 4a, and it is parallel with the 1st conductor 4a to keep at a certain distance away; The 3rd conductor 4d links together the 2nd conductor 4e and above-mentioned the 1st conductor 4a along the vertical direction on the opposite of above-mentioned joint 5, fixed contact 3 is fixed on above-mentioned the 2nd conductor 4e, and makes this fixed contact 3 be positioned at the below of the 1st conductor 4a.

In addition, said fixing contact 4 is installed on the container 12, the 3rd conductor 4d is arranged on than the position of fixed contact 3 other end near the fixedly moving contact 2 of movable contact 1, and is positioned at opposite one side (rotating fulcrum 14 1 sides of movable contact 1) of above-mentioned joint 5.At this moment, the 1st conductor 4a moving contact 2 all be positioned at during with the contact closure condition of fixed contact 3 contact this contact contact-making surface above, and also be positioned at when disconnecting in the contact movable contact 1 above.

Below, further describe the connection structure of above-mentioned movable contact 1 and said fixing contact 4.

At first, fixed contact 4 integrally forms the shape that slightly is the U font by the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d, and the joint 5 of power end and an end of this U font are the end that the power-supply system of above-mentioned the 1st conductor 4a continues and holds.In addition, to be fixed on the inboard of the U font of its opposite one end be the upper surface of above-mentioned the 2nd conductor 4e to fixed contact 3.

Figure 174 (a) is the plane graph of the fixed contact among Figure 172 and Figure 173, and Figure 174 (b) is the front elevation of Figure 174 (a), and Figure 176 is the oblique view of fixed contact.

In said fixing contact 4, on the bonding conductor (the 1st conductor 4a and the 3rd conductor 4d) that is positioned at above 3 stationary planes of said fixing contact, be provided with the slit 40 of the switch motion of allowing movable contact 1.

In the altitude range of the 3rd conductor 4d of such fixed contact 4, the center of rotation 14 of movable contact 1 is configured in the foreign side position relative with the slit 40 of the 3rd conductor 4d.Like this, above-mentioned movable contact 1 just can rotate along the contact switch direction by above-mentioned slit 40.

Under the off-state of the movable contact shown in Figure 173, the 1st conductor 4a of fixed contact 4 is positioned at the below of the contact-making surface of moving contact 2.The part of the 1st conductor 4a that the surface from moving contact 2 is in addition seen is covered with insulant 15.

This insulant 15 is made of insulant 15a, insulant 15b and insulant 15c, and insulant 15c covers the upper surface of the 1st conductor 4a; Insulant 15b covers the slit 40 of the 1st conductor 4a near on the inner face of joint 5 one sides; Insulant 15c covers on the both sides inner surface (with the face facing surfaces of the track that contains movable contact 1) of above-mentioned slit 40.

In the above-described embodiments, shown in Figure 172 and Figure 173, the superjacent air space at the 1st conductor 4a of fixed contact 4 is disposing many plates magnetic sheet 16 up and down abreast with appropriate intervals.

Figure 175 is the plane graph of the magnetic sheet among Figure 172 and Figure 173.

Above-mentioned magnetic sheet 16 is made of flat board, is provided with the otch that slightly is the U font 160 of the switch motion of allowing above-mentioned movable contact 1 above.In detail, by two transverse arm 16a that above-mentioned otch 160 is clipped in the middle with in joint 5 one sides of said fixing contact 4 the joint portion 16b that these two transverse arm 16a link into an integrated entity is constituted exactly.

In Figure 172 and Figure 173, driving mechanism shown in Figure 18 and operating grip 9 have been omitted.These parts also have in the present embodiment certainly.

Below, its action is described.

Under the contact closure condition shown in Figure 172, when flowing through big electric current such as electric current such as short circuit, movable contact 1 does not wait for that the action of driving mechanism just begins to rotate, moving contact 2 and fixed contact 3 are separated, simultaneously, electric arc A takes place between contact 2,3, these are all the same with situation about having earlier.

Figure 177 is the effect owing to electromagnetic repulsive force, the state after moving contact 2 has just been separated with fixed contact 3, and under this state, the contact-making surface of movable contact 2 also is in the below of the 1st conductor 4a.Among the figure, arrow is represented electric current.

Under the state after has just separated such contact, the forceful electric power magneticaction that points to rotation direction is on movable contact 1.This is owing to be positioned at the cause of electric arc A top to the current path of the 1st conductor 4a formation of fixed contact 4 from the joint 5 of power end.As a result, the electromagnetic force to electric arc A effect of above-mentioned current path generation is exactly the active force that electric arc A is stretched to joint 5 directions.At this moment, flow through the electric current of the 3rd conductor 4d of fixed contact 4 and the current opposite in direction of electric arc A.Therefore, flowing through the electromagnetic force that the electric current of fixed contact 4 produces also is the active force that electric arc A is stretched to joint 5 directions.What in addition, flow through that the electric current of the 2nd conductor 4e of fixed contact 4 produces also is the electromagnetic force that electric arc A is stretched to joint 5 directions.

Therefore, the electromagnetic force that flows through the electric current generation of said fixing contact 4 all is the directed force F m that electric arc A is stretched to joint 5 directions, thereby can obtain very large electric arc driving magnetic field, and electric arc A is elongated to joint 5 directions, and arc voltage raises sharp.

Figure 178 represents the maximum off-state that movable contact 1 reaches, and has omitted the electric arc A between the contact 2,3 among the figure.

Under this state, the electric current of all conductors by fixed contact 4 all is to magnetic field that joint 5 directions stretch in the magnetic field that the following side space of the 1st conductor 4a produces with electric arc.Below, the magnetic field of this direction is called driving magnetic field, and the reciprocal electric arc A that is about to is called contrary driving magnetic field to the magnetic field of center of rotation 14 1 side drives of movable contact 1.

Figure 179 is the profile along the A-A line of Figure 178, is the situation that does not have magnetic sheet 16.Among the figure, B represents the magnetic field that the 1st conductor 4a produces, and I is represented the arc current that flows to moving contact 2 from fixed contact 3.

As seen from the figure, below the 1st conductor 4a, the driving magnetic field really of the magnetic field B that the electric current by the 1st conductor 4a produces, still, in the space above the 1st conductor 4a, this magnetic field B is contrary driving magnetic field.

Figure 180 is the profile of regular A-A line along Figure 178 that the state of configuration magnetic sheet 16 is shown in Figure 179.But Figure 180 is the situation of drawing a magnetic sheet 16 for simplicity.At this moment, variation has taken place in the DISTRIBUTION OF MAGNETIC FIELD that side space down produces in the electric current by the 1st conductor 4a, and still, driving magnetic field does not change.

On the other hand, the space above the 1st conductor 4a, the magnetic field B that the electric current by the 1st conductor 4a produces is absorbed by magnetic sheet 16, so, contrary driving magnetic field can not appear in the otch 160 between the transverse arm 16a of magnetic sheet 16.This situation is shown in Figure 181 with oblique view.

In Figure 181, arrow represents that Bo is the magnetic field in space by the magnetic field of the electric current generation of the 1st conductor 4a, and Bi is the magnetic field in the magnetic sheet 16.

The magnetic field B o of the electric current below the 1st conductor 4a is in the space, the electric arc in this space is applied the electromagnetic force of sensing joint 5 directions.Above the 1st conductor 4a, because above-mentioned magnetic field B o will pass through with the inside of the little magnetic sheet 16 of magnetic resistance, so,, wear in public from another transverse arm 16a again by joint portion 16b from a transverse arm 16a of magnetic sheet 16.

Therefore, there is not contrary driving magnetic field in otch 160 places between the transverse arm 16a of magnetic sheet 16, thereby just can not apply reciprocal electromagnetic force to the electric arc at these otch 160 places yet.

Figure 182 is the plane graph of the contrary driving magnetic field of expression the 1st conductor 4a superjacent air space situation about being absorbed by magnetic sheet 16 fully.

Like this, if contrary driving magnetic field is absorbed by magnetic sheet 16 fully, then for the just not contrary driving magnetic field effect of the electric arc of the 1st conductor 4a top.

But if increase by the electric current of the 1st conductor 4a, then the magnetic field of this electric current generation also increases, so magnetic sheet 16 just can not absorb contrary driving magnetic field fully.That is, magnetic sheet 16 has reached magnetic saturation.

Magnetic field in the magnetic sheet 16 is all by entering another transverse arm 16a again, so the magnetic flux density in the magnetic sheet 16 is high more the closer to above-mentioned joint portion 16b behind the 16b of joint portion.

Therefore, above-mentioned magnetic sheet 16 is from the part generation magnetic saturation of transverse arm 16a near joint portion 16b.As a result, shown in Figure 183 like that because the magnetic saturation of magnetic sheet 16, contrary driving magnetic field will promptly leak than the space of fixed contact 3 more close joint 5 one sides to the space of the most close joint portion 16b of the otch between transverse arm 16a 160.

Therefore, the contrary driving magnetic field of leakage can not produce too much influence to the electric arc between moving contact 2 and the fixed contact 3.

Figure 184 is the end view that is illustrated in the superjacent air space configuration polylith magnetic sheet of fixed contact.

As shown in the figure, during configuration polylith magnetic sheet 16-1～16-3, if increase by the electric current of the 1st conductor 4a, the magnetic sheet 16-1 of then the most close the 1st conductor 4a is earlier saturated, but the contrary driving magnetic field that leaks out from this magnetic sheet 16-1 is just absorbed by top magnetic sheet 16-2 at once.Therefore, at otch 160 places that have electric arc, contrary driving magnetic field can not appear.In addition, after electric current further increased, even magnetic saturation also takes place magnetic sheet 16-2, at this moment, contrary driving magnetic field also can be absorbed by magnetic sheet 16-3.Therefore, if polylith magnetic sheet 16-1～16-3 is set, just can absorb the contrary driving magnetic field of the 1st conductor 4a superjacent air space more completely as above-mentioned situation.

In addition, for the electric arc below the 1st conductor 4a of fixed contact 4, as with Figure 177 explanation, acting on the electromagnetic force Fm of strong driving magnetic field, as described below, also there is driving magnetic field in slit 40 parts at the 1st conductor 4a.

Figure 183 is the profile along the fixed contact 4 of A-A line among Figure 178.Among the figure, the 41st, the center of each section of slit 40 left and right sides the 1st conductor 4a and the 2nd conductor 4e.

Figure 186 is the magnetic field distribution figure of magnetic field on the Z of Figure 185 axle that produces according to the electric current that passes through fixed contact 4 that Theoretical Calculation is obtained, and the magnetic field of positive direction is the magnetic-field component (driving magnetic field) that electric arc A is stretched to joint 5 one laybacks.

Shown in Figure 185 like that, the 1st conductor 4a is positioned at the position, the left and right sides of the rotational plane that departs from movable contact 1.

In such conductor arrangement, owing to pass through the influence of the electric current of the 2nd conductor 4e and the 3rd conductor 4d, shown in Figure 186, up to the upper space zone of the 1st conductor 4a ZO, all having the magnetic-field component that electric arc A is stretched to joint 5 one laybacks is the electric arc driving magnetic field.

As a result, at the superjacent air space of the 1st conductor 4a, not contrary driving magnetic field, electric arc all are subjected to pointing to the forceful electric power magneticaction of joint 5 directions from the somewhere of fixed contact 3 to the 1st conductor 4a top.Therefore, as Figure 187 of maximum off-state of expression movable contact 1, electric arc A be extruded to cover the 1st conductor 4a slit 40 near being cooled off on insulant 15b on the inner faces of joint 5 one sides and the magnetic sheet 16.As a result, the arc voltage that sharply raises after just separate the contact further increases, and can keep high arc voltage, so, can obtain having the circuit-breaker of good current limiting performance.

Figure 188 (a)～Figure 188 (d) is respectively the plane graph of the different magnetic sheet variation of flat shape.

As shown in the figure, the shape of the otch 160 by changing magnetic sheet 16 etc., the flat shape of the magnetic sheet 16 in the foregoing description 73 can obtain all distortion.

Figure 189 (a) is the plane graph of the magnetic sheet of other variation, and Figure 189 (b) is the end view of Figure 189 (a).

The magnetic sheet 16 of this variation, the transverse arm 16a of both sides is thinner, and joint portion 16b is thicker, and this transverse arm 16a and the whole formation of joint portion 16b is step-like, at this moment, also can obtain same effect.

Figure 190 (a) is the end view of the magnetic sheet of other variation, and the end thickness of magnetic sheet 16 integral body of this variation from the front end of the transverse arm 16a of both sides to joint portion 16b increases gradually.Figure 190 (b) is the end view of the magnetic sheet of another variation, and the magnetic sheet 16 of this variation is opposite with the situation of Figure 189, be that the transverse arm 16a of both sides is thicker, and joint portion 16b is thinner.No matter which kind of situation can both obtain same effect.

Figure 191 is the electrode end view of circuit-breaker with another variation magnetic sheet of embodiment 73.

In this variation, reduce the thickness of magnetic sheet 16, increase the quantity of magnetic sheet 16, with narrow gap, dip-parallel be configured in the superjacent air space of the 1st conductor 4a of fixed contact 4, at this moment, also can obtain same effect, simultaneously, above-mentioned a plurality of magnetic sheet 16 also has the effect of arc extinguishing board concurrently.

In the above-described embodiments, absorb contrary driving magnetic field when constituting magnetic sheet 16 easily with the big material of magnetic permeability, so, as the material of above-mentioned magnetic sheet 16, for example, can use iron in the metal material, in addition, also can constitute with the magnetic of inorganic ferrite class.

Embodiment 74:

Figure 192 is the plane graph with fixed contact of magnetic sheet and embodiment 74 claim 2 correspondence of the present invention, and Figure 193 is the end view that adds the movable contact that is in off-state in Figure 192.

In present embodiment 74, with the joint portion 16b of magnetic sheet 16 near the interior end edge portion 160b of fixed contact 3 one sides be provided with than the slit 40 that covers fixed contact 4 near more close joint 5 one sides of insulant 15b on the inner face on joints 5 one side.That is, in other words, with otch 160 lengthenings of magnetic sheet 16, the Closed End 160b that makes its top is in the plane than more close joint 5 one sides of above-mentioned insulant 15b, and other structure is identical with the foregoing description 73.Adopt such structure, also can obtain same effect.

In addition, according to present embodiment 74, shown in Figure 193, contacted to the easy and above-mentioned insulant 15b of electric arc A that joint 5 directions stretch by magnetic field during disconnection, the interior end edge portion 160b of the joint portion 16b of magnetic sheet 16 can not influence, so, can improve the electric arc cooling effect.

In addition, in the such large-current electric arc of short circuit current, the metal vapors stream of direction ejection contact evaporation from the electric arc root of contact surface along the vertical contact surface, known now, this steam flow is the main component of electric arc A.

In present embodiment 74, shown in Figure 193, after the 15a of the insulant 15 that above-mentioned metal vapors stream is blown to fixed contact 4 above particularly goes up, cooled off forcibly, so arc voltage is higher, thereby improved current limiting performance.

Embodiment 75:

Figure 194 is the plane graph that embodiment 75 has the magnetic sheet fixed contact, and Figure 195 is the electrode end view that the movable contact that is in off-state is added in the circuit-breaker on Figure 194, and Figure 196 is the profile along the B-B line of Figure 195.

In present embodiment 75, the medial margin of the transverse arm 16a of magnetic sheet 16 is far away than the insulant 15c fixed distance contact 3 on slit 40 medial surfaces that cover fixed contact 4.In other words, make the width of otch 160 of magnetic sheet 16 greater than the width of the slit 40 of fixed contact 4.Other structure is identical with the foregoing description 74.Adopt such structure, also can obtain the effect identical with the foregoing description 74.

In addition, according to present embodiment 75, shown in Figure 196, owing to cover insulant 15c on above-mentioned slit 40 medial surfaces than the more close electric arc A of the medial margin portion of the transverse arm 16a of magnetic sheet 16, so electric arc A contacts with insulant 15c and cooling effectively easily, thereby can improve current limiting performance.

Embodiment 76:

Figure 197 is the plane graph that embodiment 76 has the fixed contact of magnetic sheet, and Figure 198 is the electrode end view that adds the circuit-breaker of the movable contact that is in off-state in Figure 197, and Figure 199 is the profile along the C-C line of Figure 198.

In present embodiment 76, the medial margin of the transverse arm 16a of magnetic sheet 16 is than the more close fixed contact 3 of insulant 15c on slit 40 medial surfaces that cover fixed contact 4.In other words opposite with the situation of the foregoing description 75, make the width of otch 160 of magnetic sheet 16 narrower than the width of the slit 40 of fixed contact 4, other structure is identical with the foregoing description 2.Adopt such structure, also can obtain same effect.

In addition, according to present embodiment 76, shown in Figure 199, owing to the insulant 15c on the medial surface that covers above-mentioned slit 40 is far away from electric arc A than the medial margin portion of the transverse arm 16a of magnetic sheet 16, so electric arc A is difficult to contact with insulant 15c, thereby electric arc is difficult to damage insulant.Therefore, the insulant 15c as the medial surface of the slit 40 that covers fixed contact 4 can use the little material of arc resistance or make the thickness attenuation.

Embodiment 77:

Figure 200 is the plane graph that embodiment 77 has the fixed contact of magnetic sheet, and Figure 20 1 is the electrode end view that adds the circuit-breaker of the movable contact that is in off-state in Figure 200.

In present embodiment 77,, be provided with than more close fixed contact 3 one sides of insulant 15b on the slit 40 close inner faces of joint 5 directions that cover fixed contact 4 with the joint portion 16b of magnetic sheet 16 interior end edge portion 160b near fixed contact 3 one sides.In other words opposite with the situation of the foregoing description 74, the length of the otch 160 of shortening magnetic sheet 16 makes it more close fixed contact 3 one sides than the insulant 15b of fixed contact 4, and other structure is identical with the foregoing description 76.Utilize such structure, also can obtain the effect identical with the foregoing description 73.

In addition, according to embodiment 77, shown in Figure 20 1, the electric arc A that is stretched to joint 5 directions by magnetic field during disconnection is prevented from the end edge portion of magnetic sheet 16, is difficult to contact with insulant 15b, so electric arc A is to the damage minimizing of insulant 15b.On the other hand, be extruded to the cooling effect that electric arc A on the ora terminalis of magnetic sheet 16 is subjected to magnetic sheet 16.Therefore, the insulation breakdown of fixed contact 4 reduces, thereby can obtain the good circuit-breaker of current limiting performance.

Embodiment 78:

Figure 20 2 is plane graphs that embodiment 78 has the fixed contact of magnetic sheet, Figure 20 3 is electrode end views of circuit-breaker when adding the big failure of current of the movable contact that is in off-state in Figure 20 2, the end view of the electrode of circuit-breaker when Figure 20 4 is little failures of current.

In present embodiment 78, shown in Figure 20 2, on the 16b of the joint portion of magnetic sheet 16, will the narrow slit 160a narrower follow above-mentioned otch 160 and continue to cut than the width of otch 160.Other structure is identical with the foregoing description 77.

According to present embodiment 78, the electric arc A when movable contact 1 is in off-state is subjected to the electromagnetic force that drives to joint 5 directions, and still, when big circuitry cuts, the diameter of above-mentioned electric arc A increases, so shown in Figure 20 3, electric arc A can not enter in the narrow slit 160a.Therefore, make the such structure of present embodiment 78, also can obtain the effect identical with the foregoing description 77.

When little failure of current, because the diameter of electric arc A is little, so shown in Figure 20 4, electric arc A will be stretched in the narrow slit 160a dearly, 15b effectively cools off by insulant.As a result, can improve little current shut-off performance.

In present embodiment 78, for locking the inner (right-hand member of Figure 20 2) of making narrow slit 160a than more close joint 5 one sides of insulant 15b, form above-mentioned narrow slit 160a longer.But, shown in Figure 20 5 like that, form above-mentioned narrow slit 160a shorter, the locking inside that makes above-mentioned narrow slit 160a also can obtain same effect than more close fixed contact 3 one sides of above-mentioned insulant 15b.

Embodiment 79:

Figure 20 6 is plane graphs that embodiments of the invention 79 have the fixed contact of magnetic sheet, and Figure 20 7 is the electrode end views that add the circuit-breaker of the movable contact that is in off-state in Figure 20 6, and Figure 20 8 is the profiles along the D-D line of Figure 20 7.

In present embodiment 79, make the medial margin of transverse arm 16a of magnetic sheet 16 more farther from fixed contact 3 than the insulant 15c on the medial surface of the slit 40 that covers fixed contact 4.In other words, the width of the otch 160 of magnetic sheet 16 is bigger than the width of the slit 40 of fixed contact 4.This point is identical with the situation of the embodiment 75 that illustrates according to Figure 194.Different with embodiment 75 is, forms the length of above-mentioned otch 160 shorter, and the interior ora terminalis 160b of otch 160 that makes magnetic sheet 16 is than more close fixed contact 3 one sides of the insulant 15b of fixed contact 4.Other structure is identical with the foregoing description 75.Adopt such structure, also can obtain same effect.

In addition, according to present embodiment 79, shown in Figure 20 8, owing to cover insulant 15c on the medial surface of above-mentioned slit 40 than the more close electric arc A of the medial margin of the transverse arm 16a of magnetic sheet 16, so electric arc A contacts with insulant 15b easily and is cooled effectively.Therefore, can improve current limiting performance.

Embodiment 80:

Figure 20 9 is plane graphs that the embodiment of the invention 80 has the fixed contact of magnetic sheet.

In present embodiment 80, identical with the situation of the embodiment 78 shown in Figure 20 2, on the 16b of the joint portion of magnetic sheet 16, will the narrow slit 160a narrower follow otch 160 and continue to cut than the width of otch 160.Here, different with embodiment 78 is, makes the width of otch 160 of magnetic sheet 16 bigger than the slit 40 of the 1st conductor 4a of fixed contact 4, thereby makes the medial surface of above-mentioned otch 160 be positioned at the outside than the insulant 15c on the medial surface that covers slit 40.Other structure is identical with the foregoing description 79.

According to present embodiment 80, as previously mentioned, for the large-current electric arc, above-mentioned narrow slit 160a is influence not, so, can obtain the effect identical with the foregoing description 79.

In addition, according to present embodiment 80, during little failure of current, electric arc will be stretched in the above-mentioned narrow slit 160a dearly, so, can improve little current shut-off performance.

Embodiment 81:

Figure 21 0 is the plane graph that the embodiment of the invention 81 has the fixed contact of magnetic sheet, and Figure 21 1 is the electrode end view that adds the circuit-breaker of the movable contact that is in off-state in Figure 21 0, and Figure 21 2 is the profiles along the E-E line of Figure 21 1.

In present embodiment 81, the medial margin of transverse arm 16a that makes magnetic sheet 16 is than the more close fixed contact 3 of the insulant 15c on the medial surface of the slit 40 that covers fixed contact 4.In other words, make the width of otch 160 of magnetic sheet 16 narrower than the width of the slit 40 of fixed contact 4.This point is identical with the situation of the embodiment 76 that illustrates according to Figure 198.The length of different with embodiment 76 is otch 160 is shorter, makes the interior ora terminalis 160b of otch 160 than more close fixed contact 3 one sides of the insulant 15b on the slit 40 of the 1st conductor 4a that covers fixed contact 4.Other structure is identical with the foregoing description 76.Adopt such structure, also can obtain the effect identical with the foregoing description 76.

In addition, according to present embodiment 76, shown in Figure 21 2, because the insulant 15c that covers on above-mentioned 40 the medial surface is far away from electric arc A than the medial margin of the transverse arm 16a of magnetic sheet 16, so electric arc A is difficult to contact with insulant 15c, is difficult to be subjected to the damage of electric arc to arc edge thing.Therefore, as the insulant 15c on the medial surface of the slit 40 that covers fixed contact 4, can use the little material of arc resistance and can coating thin thickness.

Embodiment 82:

Figure 21 3 is plane graphs that the embodiment of the invention 82 has the fixed contact of magnetic sheet.

In present embodiment 82, on the joint portion 16b of the magnetic sheet 16 of the foregoing description 81, be provided with narrow slit 160a.Other structure is identical with the foregoing description 81.As previously mentioned, for the large-current electric arc, above-mentioned narrow slit 160a is influence not, and present embodiment 82 also has the effect identical with the foregoing description 81.In addition, in present embodiment 82, during little failure of current, electric arc will be stretched in the above-mentioned narrow slit 160a dearly, so, can improve little current shut-off performance.

Embodiment 83:

Figure 21 4 is electrode end views of the circuit-breaker of the embodiment of the invention 83 with magnetic sheet.

In present embodiment 83, be provided with polylith magnetic sheet 16-1～16-2 at the superjacent air space of the 1st conductor 4a of fixed contact 4, and the thickness of the magnetic sheet 16-1 of the most close the 1st conductor 4a is thicker than other magnetic sheet 16-2.Other structure is identical with the foregoing description 73.Adopt such structure, also can obtain the effect identical with the foregoing description 73.

In addition, according to present embodiment 83, because the magnetic sheet 16-1 of the most close the 1st conductor 4a is thicker than other magnetic sheet 16-2, so, can further absorb contrary driving magnetic field fully by the electric current generation of the 1st conductor 4a.

As previously mentioned, in the time can not absorbing after the magnetic sheet 16-1 of the most close the 1st conductor 4a magnetic saturation again against driving magnetic field, the contrary driving magnetic field that leaks out from magnetic sheet 16-1 can be absorbed by top magnetic sheet 16-2 at once, but, if big to the distance of magnetic sheet 16-2, then before absorbing electric arc can be emitted to its existing space.

Therefore,, make the thickness thickening of the magnetic sheet 16-1 of the most close the 1st conductor 4a, just magnetic saturation can not take place if as present embodiment 83, so, the influence of contrary driving magnetic field can be eliminated more completely, thereby the good circuit-breaker of current limiting performance can be obtained.

Figure 21 5 is end views of electrode of the variation circuit-breaker of the foregoing description 83.

In this variation, the polylith magnetic sheet 16 that makes the superjacent air space that is configured in the 1st conductor 4a is the closer to the 1st conductor 4a, and the interval between them is narrow more.At this moment also can obtain same effect.

Figure 21 6(a) be the end view of electrode of other variation circuit-breaker of the foregoing description 83, Figure 21 6(b) be along Figure 21 6(a) the profile of F-F line.

In this variation, as Figure 21 6(b) shown in, make the otch 160 that on the polylith magnetic sheet 16 of the superjacent air space that is configured in the 1st conductor 4a, forms respectively narrow more the closer to the width of the otch 160 of the magnetic sheet 16 of the 1st conductor 4a.Adopt such structure, also can obtain same effect.

Embodiment 84:

Figure 21 7 is end views of the connection structure of the fixed contact of circuit-breaker of embodiment 84 and movable contact and magnetic sheet, and Figure 21 8 is end views of the state of movable contact in the disconnection process among Figure 21 7.

In present embodiment 84, shown in Figure 21 7, dispose magnetic sheet 16 to such an extent that make when the off-state, the angle θ 2 of magnetic sheet 16 is greater than the angle θ 1 of S face, and the S face is to comprise electric current streamline by movable contact parallel plane of interior track with when containing movable contact 1 switch.Other structure is identical with the foregoing description 73.Adopt such structure also can obtain the effect identical with the foregoing description 73.

When the off-state of above-mentioned movable contact 1, if satisfy above-mentioned condition, in the disconnection process of movable contact 1, shown in Figure 21 8, the transverse arm 16a of movable contact 1 and magnetic sheet 16 intersects sometimes.Its enlarged drawing is as Figure 21 9(a) shown in.

Figure 21 9(a) be the end view that the transverse arm of movable contact and magnetic sheet is in intersection, Figure 21 9(b) be Figure 21 9(a) plane graph.

Among the figure, I is the electric current by movable contact 1, and I v is this electric current current component vertical with the plane of magnetic sheet 16, and the position relation of magnetic sheet 16 relative this current component I v is as Figure 21 9(b) shown in.

At Figure 21 9(b) state under, the magnetic field B that current component I v itself produces is owing to the existence of magnetic sheet 16 distorts, current component I v is subjected to the power F of top directive effect of the otch 160 of magnetropism plate 16, this is a called optical imaging.As Figure 21 9(a) shown in, this power F is parallel with magnetic sheet 16, but in present embodiment 84, the component F v perpendicular to movable contact 1 of above-mentioned power F is to the power that disconnects directive effect with movable contact 1.

Therefore, adopt the structure of present embodiment 84, can improve the opening speed that moves to the later movable contact 1 in the 1st conductor 4a top, thereby can further improve current limiting performance.

Embodiment 85:

Figure 22 0 is the end view of the electrode of the circuit-breaker of embodiment 85 with magnetic sheet, and Figure 22 1 is the profile along the G-G line of Figure 22 0, and Figure 22 2 is the profiles along the H-H line of Figure 22 0.In addition, in Figure 22 1, omitted movable contact among Figure 22 0.

In present embodiment 85, the tabular support plate 161 of magnetic sheet 16 usefulness both sides is maintained.Promptly, integrally form the 16c of mosaic process portion in the both sides of above-mentioned magnetic sheet 16, and on above-mentioned support plate 161, be provided with the embedded hole 162 that is used to embed the above-mentioned mosaic process 16c of portion, by the above-mentioned mosaic process 16c of portion is embedded this embedded hole, utilize above-mentioned support plate 161 to maintain above-mentioned magnetic sheet 16.At this moment, make the 16c of mosaic process portion of the magnetic sheet 16 in the embedded hole 162 that embeds support plate 161 not be projected into the outside from above-mentioned embedded hole 162.Adopt such structure, also can obtain the effect identical with the foregoing description 73.

Like this, when keeping magnetic sheets 16 with support plate 162, shown in Figure 22 2, the distance of the 1st conductor 4a of above-mentioned mosaic process 16c of portion and fixed contact 4 nearby.

According to electrode structure of the present invention, when failure of current, can produce very high arc voltage, so, when magnetic sheet 16 is metal materials such as iron, if be full of the high-temperature gas that electric arc produces during big failure of current, then might between above-mentioned mosaic process 16c of portion and above-mentioned the 1st conductor 4a, cause insulation breakdown.

But, according to present embodiment 85, though the 16c of mosaic process portion is near from the distance of the 1st conductor 4a, but, owing to be entrenched in the middle part of the embedded hole 162 of support plate 161, so, the insulation breakdown between the 1st conductor 4a of the 16c of mosaic process portion of magnetic 16 and fixed contact 4 can be prevented.

In the foregoing description 73～85, the situation of circuit-breaker is described, still, also can be used on other switch, and can obtain the effect identical with the foregoing description 73～85.

Embodiment 86:

Below, with reference to description of drawings one embodiment of the present of invention.Figure 22 3 is the circuit-breaker of embodiment 86 end views when being in closure state, and Figure 22 4 is the circuit-breaker of Figure 22 3 end views when becoming off-state.In the structure of present embodiment, identical with the various embodiments described above except the connection structure of movable contact 1 and fixed contact 4, so explanation is omitted.

Said fixing contact 4 is installed on the container 12, makes the 3rd conductor 4d be configured in the other end than the fixedly moving contact 2 of the more close movable contact 1 in the position of fixed contact 3, and is positioned at the opposite (center of rotation 14 1 sides of movable contact 1) of above-mentioned joint 5.At this moment, the 1st conductor 4a moving contact 2 all be positioned at during with contact closure condition that fixed contact 2 contacts this contact contact-making surface above, and, when the off-state of contact, be positioned at moving contact 2 contact-making surface below.In addition, the 15th, insulant is on the 1st conductor 4a that sees from the surface of moving contact 2 when covering the contact off-state.

Arc extinguishing board 6 shown in Figure 22 3 and Figure 22 4 is provided with the otch (not shown) in order not hinder movable contact 1 to rotate.In addition, an arc extinguishing board 6a in this arc extinguishing board 6 is provided with to such an extent that contact or be fixed on the insulant 15 for face with the insulant 15 on the top of the 1st conductor 4a.In Figure 22 3 and Figure 22 4, omitted shown in Figure 3 have earlier the driving mechanism 8 in the circuit-breaker and the joint 10 of handle 9 and load end, these parts all install in container 12 certainly.

Figure 22 5(a) and Figure 22 5(b) be the oblique view of fixed contact of one embodiment of the present of invention of claim 1.Figure 22 5(a) fixed contact 4 shown in forms an integral body by the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d, and the continue end of end of joint 5 and the power supply of the 1st conductor 4a is connected.In addition, fixed contact 3 is fixed on the upper surface of the 2nd conductor 4e.In fixed contact 4, at the slit 40 that is provided with on the bonding conductor above the stationary plane that is positioned at said fixing contact 3 (the 1st conductor 4a and the 3rd conductor 4d) for the switch motion that does not hinder the fixed contact 3 on movable contact 1 relative the 2nd conductor 4e.

At Figure 22 5(b) in, the 15th, insulant, this insulant 15 is with the surface of said fixing contact 4 and inner surface the covering to the 3rd conductor 4d with near the of joint 5 junctions from the 1st conductor 4a of above-mentioned slit 40.

Below, its action is described.When by big electric current such as short circuit current, movable contact 1 does not wait for that the action of driving mechanism just begins to rotate, and moving contact 2 and fixed contact 3 are separated, and electric arc A takes place between contact 2,3 simultaneously, and these are all identical with situation about having earlier.Figure 22 6 is that the contact-making surface of moving contact 2 also is in the state of the below of the 1st conductor 4a after separate above-mentioned contact 2,3.Wherein, arrow is represented electric current, for simplicity, has omitted arc extinguishing board 6.

From the current path that joint 5 to the 1st conductor 4a constitute, all be positioned at the top of electric arc A.As a result, this current path is the active force that electric arc A is stretched to joint 5 one laybacks to the electromagnetic force that electric arc A produces.In addition, because electric current by the 3rd conductor 4d and the current opposite in direction of electric arc A, so the electromagnetic force that the electric current by the 3rd conductor 4d produces also is the active force that electric arc A is stretched to joint 5 one laybacks.Therefore, the electromagnetic force that produces of the electric current by fixed contact 4 all is the active force that electric arc A is stretched to joint 5 one laybacks.As a result, the electric arc A after has just separated the contact is subjected to stretching consumingly, and arc resistance raises sharp.

Figure 22 7(a) be the end view of movable contact and fixed contact, Figure 22 7(b) be along Figure 22 7(a) the profile of A-A line, among the figure, the 41st, the center of each section of the 1st conductor 4a of slit 40 left and right sides.Figure 22 7(c) be the magnetic field that produces according to the electric current that passes through fixed contact 4 that Theoretical Calculation goes out, at Figure 22 7(b) the Z axle on magnetic field distribution figure, the magnetic field of positive direction is the magnetic-field component that electric arc A is stretched to joint 5 one laybacks.As Figure 22 7(b) shown in, so the 1st conductor 4a is positioned at the position, the left and right sides of the rotational plane that departs from movable contact 1.

In such conductor arrangement,, all there is the magnetic-field component that electric arc A is stretched to joint 5 directions up to the space on the 1st conductor 4a top (regional ZO) owing to pass through the influence of the electric current of the 2nd conductor 4e and the 3rd conductor 4d.Therefore, even as Figure 22 8, the moving contact face turns to the top of the 1st conductor 4a, slit part at the 1st conductor 4a, electric arc A also can be owing to the power that is subjected to the stretching of joint 5 directions is extruded on the insulant 15a that covers on the slit 40 top end faces, in addition, cover the medial surface of the 1st conductor 4a and the insulant 15b on the upper surface and 15c and also be positioned at the position of being shone by electric arc, these insulants and the gas of emitting after electric arc contacts, electric arc there is cooling effect, still, will causes that the circuit breaker pressure inside rises, so, the harmful one side that can damage container is also arranged.

Therefore; if image pattern 223 is such; being provided with arc extinguishing board 6a with the insulant 15c on the 1st conductor 4a top is that face contacts or is fixed on this insulant 15c; then the moving contact face turns to after the top of the 1st conductor 4a; can protect and alleviate a part of insulant 15a and 15c and directly contact, thereby can suppress the circuit breaker pressure inside with electric arc.In addition, arc extinguishing board 6a and the 1st conductor 4a are not electrically contacted, usually, the root of electric arc is positioned on fixed contact 3 or the 2nd conductor 4e, so, can keep high arc voltage.As a result, can obtain good, the safe circuit-breaker of current limiting performance.In addition, image pattern 229 is such, is provided with the arc extinguishing board 6 that has earlier with parallel for the arc extinguishing board 6a of face contact with insulant 15, can increase the quantity of the arc extinguishing board 6 of subdividing the arc effectively, further improve cooling effect, thereby can improve the cut-out performance electric arc.Figure 23 0 is the oblique view of an example of the foregoing description 86, and Figure 23 1 is some examples of the shape of arc extinguishing board 6a.

Embodiment 87:

Figure 23 2 is end views of the major part of embodiment 87, and among the figure, 15d is the insulant that covers the 1st conductor 4a bottom of fixed contact 4.If be provided with arc extinguishing board 6a with the contact of the insulant 15d maintenance face of the 1st conductor 4a bottom; perhaps be fixed on the insulant 15d; then can protect and alleviate that a part of insulant 15d directly contacts with electric arc after just separate the contact, thereby can obtain the effect identical with the foregoing description 86.Figure 23 3 is oblique views of an example in the present embodiment.Figure 23 1 is some examples of the shape of arc extinguishing board 6b.

Embodiment 88:

Figure 23 4 is oblique views of the major part of embodiment 88, among the figure, 6c is an arc extinguishing board, and insulant 15a, the 15c that covers the 15b of its medial surface and cover its upper surface of end, slit 40 top of the 1st conductor 4a that it will cover the 1st conductor 4a of fixed contact 4 all hides.This arc extinguishing board 6c can also protect the insulant 15a that consumes end, maximum slit 40 top owing to driving electric arc, thereby can obtain the circuit breaker bigger than the effect of the foregoing description 1 and 2.

In addition, shown in also can image pattern 235 like that, the 2nd conductor 4e is extended to the direction of center of rotation, the 2nd conductor 4e that is fixing fixed contact 3 that replaces the fixed contact 4 shown in the foregoing description 86 and 87, parallel oppositely when making electric current by part the 2nd conductor 4e by the electric current of movable contact 1 basically with closure state.Like this, the electromagnetic force that electric current by the 2nd conductor 4e produces will increase the active force that electric arc is stretched to joint 5 one laybacks, in addition, when closure state,, the velocity of rotation of movable contact 1 is increased owing to acting on electromagnetic repulsive force between the part of the 2nd conductor 4e of movable contact 1 and fixed contact 4, thereby make the contact just separate the very fast growth of arc length afterwards, so the very fast increase of arc resistance further improves current limiting performance.

Embodiment 89:

Figure 23 6 is end views that the circuit-breaker of embodiment 89 is in closure state, Figure 23 7 is end views that the circuit-breaker of Figure 23 6 becomes off-state, among the figure, 4 is fixed contacts that an end is provided with fixed contact 3, and this fixed contact 4 is made of the 1st conductor 4a, the 2nd conductor 4e and the 3rd conductor 4d.

In more detail, with embodiment 86(Figure 22 3) shown in the different structure of circuit-breaker be arc extinguishing board 6d, this arc extinguishing board 6d has the lug boss relative with the front end of movable contact 1, and the top 15a of this arc extinguishing board 6d and insulant 15 contacts.Figure 23 8(b) is the oblique view of representing joint 5, fixed contact 4, insulant 15 and arc extinguishing board 6d simultaneously.

Below, its action is described.As Figure 22 7(c) shown in like that because the influence of the electric current by the 2nd conductor 4e and the 3rd conductor 4d, there is magnetic field in the space on the 1st conductor 4a top.Therefore, even as Figure 23 9, the moving contact face turns to the top of the 1st conductor 4a, and in the slit part of the 1st conductor 4a, electric arc also can be owing to the power that is subjected to joint 5 directions stretch is extruded on the insulant 15a that covers the slit head portion.In addition, cover the insulant 15b of the medial surface of the 1st conductor 4a and upper surface and 15c and also be positioned at the position that to be shone by electric arc, these insulants have cooling effect with the gas of emitting after electric arc contacts to electric arc, but they will cause that the circuit breaker pressure inside rises, so, the harmful one side that causes that container damages is also arranged.

Therefore; if as Figure 23 8(b); dispose arc extinguishing board 6d to such an extent that contact or be fixed on this insulant 15c with the insulant 15c maintenance face on the 1st conductor 4a top; then the moving contact face turns to after the 1st conductor 4a top; can protect and alleviate insulant 15a and directly contact with electric arc, rise thereby can suppress the circuit-breaker pressure inside with a part of 15c.In addition, arc extinguishing board 6d and the 1st conductor 4a do not have and electrically contact, and electric arc is segmented between the arc extinguishing board 6d of fixed contact 3 and between arc extinguishing board 6d and the moving contact 2, and the driving magnetic field of the driving magnetic field of the contact 4 that is fixed respectively and the arc extinguishing board 6 that has earlier stretches, so, can keep high arc voltage.As a result, can obtain good, the safe circuit breaker of current limiting performance.Figure 24 0(a) and Figure 24 0(b) be the example of the shape of arc extinguishing board 6d.

Embodiment 90:

Figure 24 1 is the end view that the circuit-breaker of embodiment 90 is in closure state.15d is the insulant of bottom that covers the 1st conductor 4a of fixed contact 4, and 6d is the arc extinguishing board with lug boss relative with the front of movable contact 1, and this arc extinguishing board 6d contacts with insulant 15d.Figure 24 2 is oblique views of representing joint 5, fixed contact 4, insulant 15 and arc extinguishing board 6d simultaneously.In Figure 24 1 and Figure 24 2, omitted driving mechanism etc.Utilize present embodiment also can obtain the effect identical with the foregoing description 89.

In addition, also can be shown in Figure 24 3 like that, the 2nd conductor 4e is extended to the center of rotation direction, replacement is at the 2nd conductor 4e that is fixing fixed contact 3 of the fixed contact 4 shown in the foregoing description 89 and 90, and is parallel oppositely by the electric current of movable contact 1 when making electric current by a part the 2nd conductor 4e basically with closure state.Like this, the electromagnetic force that the electric current of the 2nd conductor 4e produces will increase the power that electric arc is stretched to joint 5 one laybacks, in addition, when closure state owing between a part the 2nd conductor 4e of movable contact 1 and fixed contact 4, acting on electromagnetic repulsive force, the velocity of rotation of movable contact 1 is increased, the very fast elongation of arc length after the contact has just been separated, so, arc resistance increases rapidly, further improves current limiting performance.

Embodiment 91:

Figure 24 4 is oblique views that the circuit-breaker of embodiment 91 is in closure state, among the figure, 4f is the terminal part of the slit on the fixed contact 4,17 are provided in a side of the electric arc guide plate on fixing the 2nd conductor 4e of fixed contact 2, be to be used to make the rapid mobile one of electric arc spot on contact portion, the electric arc that again this electric arc spot is moved the other end slides the road then.Figure 24 5 is movable contact 1 end views when being in off-state, Figure 24 6(a) be the oblique view of the fixed contact 4 that is connected with joint 5, Figure 24 6(b) be the oblique view of representing joint 5, fixed contact 4, electric arc guide plate 17 and insulant 15 simultaneously.Other structure is identical with embodiment 1, and explanation is omitted.

Below, its action is described.The contact-making surface of moving contact 2 also was in the state below the 1st conductor 4a that fixed contact 4 is connected with joint 5 after had just separated Figure 24 7 expression contacts 2,3.Wherein, arrow is represented electric current, for simplicity, has omitted arc extinguishing board 6.The current path that 4 the 1st conductor 4a constitutes from joint 5 to fixed contact all is positioned at the top of electric arc A.As a result, the electromagnetic force to electric arc A effect of this current path generation is the active force that electric arc A is stretched to joint 5 one laybacks.The current opposite in direction of electric current and electric arc by the 3rd conductor 4d is so the electromagnetic force that the electric current by the 3rd conductor 4d produces also is the active force that electric arc A is stretched to joint 5 one laybacks.Therefore, the electromagnetic force that produces of the electric current by this fixed contact 4 all is the active force that electric arc is stretched to joint 5 directions.As a result, the electric arc after has just separated the contact is very fast to be moved to electric arc guide plate 17, cooled off, and owing to the effect of electromagnetic force is extended, so arc resistance raises sharp.

In addition, as Figure 22 7(c) shown in like that, owing to pass through the influence of the electric current of the 2nd conductor 4e and the 3rd conductor 4d, there is magnetic field in space Zo on the 1st conductor 4a top, electric arc is subjected to the power to the stretching of joint 5 directions, so, even as Figure 24 8, the moving contact face turns to the top of the 1st conductor 4a, and the insulant 15a that electric arc also can be expressed to the slit top part that covers the 1st conductor 4a goes up and the raising cooling effect.As a result, the arc resistance that raises sharp after just separate the contact further increases, and keeps high arc voltage, so, can obtain the circuit breaker that the contact loss is few, current limiting performance is good.

Embodiment 92:

Figure 24 9(a) is the end view of the major part of embodiment 92.The 17th, the electric arc guide plate, from the top, from fixed contact 3 terminal 17a far away than more close joint 5 one sides of the terminal 4f of the otch of fixed contact 4.Figure 24 9(b) is the vertical view of seeing from above, for simplicity, omitted insulant 15.The electric arc that produces between the contact 2,3 is under the effect of the strong driving magnetic field of fixed contact 4, moment is just transferred on the electric arc guide plate 17, and is driven to the terminal 17a that is positioned at joint 5 one sides from the terminal 4f of otch, so, electric arc extends easily, and arc resistance is increased.In addition, because the terminal 17a of electric arc guide plate 17 is positioned at more close joint 5 one sides than the terminal 4f of otch, so, even as Figure 25 0, the moving contact face turns to the top of the 1st conductor 4a, and the insulant 15a that electric arc also can be expressed to the otch head portion that covers the 1st conductor 4a consumingly goes up and the raising cooling effect.As a result, after has just separated the contact, electric arc is elongated, after movable contact 1 turns to maximum position, can both keep high arc voltage, so, the circuit breaker that the contact loss is few, current limiting performance is good can be obtained.

Embodiment 93:

Figure 25 1 is the end view that the circuit-breaker of embodiment 93 is in closure state.The 17th, the electric arc guide plate from the top, than more close contact one side of the terminal 4f of the otch of the 1st conductor 4a, does not promptly reach the position of the terminal 4f of otch from fixed contact 3 terminal 17a far away.Like this, even the moving contact face turns to the top of the 1st conductor 4a, electric arc spot on the electric arc guide plate 17 also can rest on more close fixed contact 3 one sides than the terminal 4f of otch, electric arc will reduce the damage of the insulant 15a on the terminal 4f that covers otch, thereby can prevent insulation breakdown, simultaneously, the pressure that can relax in the circuit breaker container rises.

Embodiment 94:

Figure 25 2 is the circuit-breaker of embodiment 94 end views when being in closure state.The 17th, the electric arc guide plate is positioned at the below of the contact-making surface of fixed contact 3 from fixed contact 3 terminal 17a far away.Like this, moving contact 3 is increased to the distance of the terminal 17a of electric arc guide plate 17, so the length that is driven to the electric arc of this part under the strong magnetic field action of fixed contact 4 is also extended, so, can improve arc voltage.

Embodiment 95:

Figure 25 3(a) is the circuit-breaker of embodiment 95 end view when being in closure state.The 17th, the electric arc guide plate, 3 terminal 17a far away are positioned at the top of the contact-making surface of fixed contact 3 from fixed contact, and are positioned at the below of the transverse center of the 1st conductor 4a.Like this, under the effect of the high-intensity magnetic field of fixed contact 4, electric arc by the process that drives to joint 5 directions in, electric arc directly moves on the terminal 17a from fixed contact 3 easily, electric arc is cooled off rapidly, so, can obtain high arc voltage.In addition, because the electric arc spot that this terminal 17a promptly disconnects the later stage is positioned in the middle of the strong driving magnetic field that all electric currents of fixed contact 4 produce, so electric arc can not fall back to fixed contact 3 directions, thereby can further reduce the contact loss.Figure 25 3(b) is another example of above-mentioned electric arc guide plate.

Embodiment 96:

Figure 25 4(a) is the circuit-breaker of embodiment 96 end view when being in closure state.The 17th, the electric arc guide plate is positioned at the top of the transverse center of the 1st conductor 4a from fixed contact 3 terminal 17a far away.Like this, to the damage minimizing of the insulant 15a on the terminal 4f that covers otch, thereby can prevent insulation breakdown, the gas of emitting after can relaxing this part and electric arc contacts simultaneously causes that the pressure in the container rises.Therefore, can obtain the circuit breaker that cooling effect is big, current limiting performance is good of electric arc.Figure 25 4(b) and Figure 25 4(c) be other example of above-mentioned electric arc guide plate 17, Figure 25 4(b) be with the situation of terminal 17a to joint 5 direction bendings, not only have the effect identical with the foregoing description, and, can further stretch by the electric arc when disconnecting to joint 5 directions.

Embodiment 97:

Figure 25 5(a) is the oblique view of the major part of embodiment 97.The 17th, the electric arc guide plate, when the top was seen, the width of electric arc guide plate 17 was narrower than the inboard width of the otch of the 1st conductor 4a.Figure 25 5(b) is the vertical view of fixed contact 4, insulant 15 and the electric arc guide plate 17 of seeing above-mentioned structure from above.Like this, but just the root of restriction of transfer back arc column to the electric arc guide plate 17 enlarges, thereby can dwindle the sectional area of electric arc, so, can strengthen the effect of the electromagnetic force that all electric currents by fixed contact 4 produce, improve current limiting performance.In addition, electric arc is difficult to touch on the insulant 15b that covers the 1st conductor 4a inside, rises thereby also can suppress pressure.

Embodiment 98:

Figure 25 6(a) is the oblique view of the major part of embodiment 98.The 17th, the electric arc guide plate, when the top was seen, the width of electric arc guide plate 17 was bigger than the inboard width of the otch of the 1st conductor 4a.Figure 25 6(b) is the vertical view of fixed contact 4, insulant 15 and the electric arc guide plate 17 of seeing above-mentioned structure from above.Like this, after arc transfer is to the electric arc guide plate 17, also can contacts and be cooled off usually with insulant 15a, 15b, so, good current limiting performance can be obtained.

Embodiment 99:

Figure 25 7(a) is the end view of the major part of embodiment 99.The 18th, be used for the electric arc spot (is called and is used for the electric arc spot on the contact is moved to charging jut on it from turn of tidal stream portion that fixed contact 3 moves away.Do not consider electric arc spot moving in electric arc turn of tidal stream portion, different with the electric arc guide plate), when the top was seen, its center was than the more close contact of the terminal 4f of the otch of the 1st conductor 4a one side.Figure 25 7(b) is the vertical view of fixed contact 4, fixed contact 3 and the turn of tidal stream portion 18 of seeing above-mentioned structure from above.The electric arc that takes place between moving contact 2 and the fixed contact 3 is subjected to the strong actuating force effect of fixed contact 4, the result, and the electric arc spot is transferred in the turn of tidal stream portion 18 from fixed contact 4 at a high speed.In addition, electric arc also is activated the action of a magnetic field of direction usually after driving, be difficult to fall back to fixed contact 3 directions, so the contact loss significantly reduces.In addition, also can with between fixed contact 3 and the turn of tidal stream portion 18 or the surface insulation of the 2nd conductor 4e around the turn of tidal stream portion 18 get up, electric arc is just more difficult to fall back to returning.Because the terminal 4f that is centered close to than otch of turn of tidal stream portion 18 more leans on contact one side, so electric arc reduces the damage of the insulant 15a of the terminal 4f of covering otch, thereby can prevent insulation breakdown, simultaneously, the pressure that can relax in the circuit breaker rises.

Embodiment 100:

Figure 25 8(a) is the end view of the major part of embodiment 100.The 18th, be used for the electric arc spot from the turn of tidal stream portion that fixed contact 3 moves away, when the top was seen, its center was than more close joint 5 one sides of the terminal 4f of the otch of the 1st conductor 4a.Figure 25 8(b) is the vertical view of fixed contact 4, fixed contact 3 and the turn of tidal stream portion 18 of seeing above-mentioned structure from above.The same with the foregoing description 99, the electric arc spot is transferred in the turn of tidal stream portion 18 from fixed contact 3 at a high speed, just is difficult to after the transfer refund, so the contact loss reduces greatly.In addition, also can with between fixed contact 3 and the turn of tidal stream portion 18 or the surface insulation of the 2nd conductor 4e around the turn of tidal stream portion 18 get up, like this, electric arc just more is difficult to return.Owing to more close joint 5 one sides than the terminal 4f of otch that are centered close to of turn of tidal stream portion 18, so electric arc extends easily after shifting, arc resistance increases.In addition, electric arc is expressed on the insulant 15a of the otch terminal 4f that covers the 1st conductor 4a consumingly, so, the cooling effect height.As a result, the arc resistance that has sharply raise after has just separated the contact further increases, and keeps high arc voltage, so, can obtain the circuit breaker that the contact loss is few, current limiting performance is good.

In addition, also can be shown in Figure 25 9 like that, the 2nd conductor 4e is extended to the center of rotation direction, replace fixing on the fixed contact 4 shown in the foregoing description 91～100 the 2nd conductor 4e of fixed contact 3, parallel oppositely when making electric current by a part the 2nd conductor 4e by the electric current of movable contact 1 basically with closure state.Like this, the electromagnetic force of the current path of the 2nd conductor 4e generation has just increased the active force that electric arc is stretched to joint 5 one laybacks.In addition, between the 2nd conductor 4e of movable contact 1 and fixed contact 4, acting on electromagnetic repulsive force during owing to closure state, the velocity of rotation of movable contact 1 is increased, the very fast elongation of arc length after has just separated the contact, so arc resistance increases rapidly, further improve current limiting performance.

Embodiment 101:

Figure 26 0 is the end view of the circuit-breaker of embodiment 101 when being in closure state.Among the figure, 17b has the electric arc guide plate that electrically contacts with the 1st conductor 4a.Figure 26 1 expression movable contact 1 is in off-state, Figure 26 2(a) be the oblique view of the fixed contact 4 that is connected with joint 5, Figure 26 2(b) be the oblique view of representing joint 5, fixed contact 4, electric arc guide plate 17b and insulant 15 simultaneously.Other structure is identical with embodiment 1, and explanation is omitted.Figure 26 3 is oblique views of other shape of electric arc guide plate 17b.

Below, its action is described.The contact-making surface of moving contact 2 also was in the state of the 1st conductor 4a that is connected with joint 5 below of fixed contact 4 after Figure 26 had just separated 4 expression contacts 2,3.Wherein, arrow is represented electric current, for simplicity, has omitted arc extinguishing board 6.The current path that 4 the 1st conductor 4a constitutes from joint 5 to fixed contact all is positioned at electric arc A top.As a result, the electromagnetic force to arcing of this current path generation is the power that electric arc is stretched to joint 5 one laybacks.In addition, because the electric current of the 3rd conductor 4d by fixed contact 4 and the current opposite in direction of electric arc, so the electromagnetic force that the electric current by the 3rd conductor 4d produces also is the active force that electric arc is stretched to joint 5 one laybacks.Therefore, the electromagnetic force that produces of the electric current by fixed contact 4 is the active force that electric arc is stretched to joint 5 directions entirely.As a result, the electric arc after has just separated the contact is stretched consumingly, and arc resistance increases sharp.

In addition, as Figure 22 7(c) shown in like that, owing to pass through the influence of the electric current of the 2nd conductor 4e and the 3rd conductor 4d, there is magnetic field in space ZO on the 1st conductor 4a top, therefore, if image pattern 261 is such, the moving contact face turns to the top of the 1st conductor 4a, then electric arc also can be subjected to the active force stretched to joint 5 one laybacks, shown in arrow among the figure like that, move to the electric arc guide plate 17b of the terminal part that is configured in otch rapidly.As a result, the arc energy that high arc voltage takes place can be suppressed, that is the increase of internal pressure can be suppressed.In addition, be positioned on the electric arc guide plate 17b owing to cut off the electric arc spot in later stage, electric arc contacts with arc extinguishing board 6 easily, is cooled, cuts apart back arc extinguishing easily, so, the circuit breaker that can obtain good current limiting performance and cut off performance.

Embodiment 102:

Figure 26 5 is end views that the circuit-breaker of embodiment 102 is in closure state.Among the figure, 17b has the electric arc guide plate that electrically contacts with the 1st conductor 4a, and this electric arc guide plate 17b is configured in than more close joint 5 one sides in the position of the terminal 4f of the otch of the 1st conductor 4a.The 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates.Among the figure, omitted driving mechanism etc.Figure 26 6(a) be to represent the fixed contact 4 that is connected with joint 5 and the oblique view of electric arc guide plate 17b, Figure 26 6(b simultaneously) be at Figure 26 6(a) in oblique view when adding insulant 15.

It is identical with the foregoing description 101 with the rapid situation about increasing of arc resistance that electric arc after has just separated the contact is stretched consumingly.Then, when the moving contact face turned to the 1st conductor 4a top, electric arc also was subjected to the active force stretched to joint 5 one laybacks, but, because electric arc guide plate 17b is positioned at than more close joint 5 one sides of the terminal of otch, so electric arc is extruded on the insulant 15a earlier and is cooled off.Because arc length is big, current limliting fully, in addition, electric arc moves on the electric arc guide plate 17b, just can suppress pressure and rise.In addition, because electric arc guide plate 17b is configured in more close joint 5 one sides than the terminal 4f of otch, be insulated on every side, so even current value reduces, the driving magnetic field that fixed contact 4 produces reduces, electric arc also is difficult to fall back to the direction of fixed contact 3.Therefore, the electric arc spot that cuts off the action later stage is rested on the electric arc guide plate 17b, electric arc contacts with arc extinguishing board 6 easily, is cooled, cuts apart back arc extinguishing easily.

Embodiment 103:

Figure 26 7 is the circuit-breaker of embodiment 103 end views when being in closure state.Among the figure, 17b has the electric arc guide plate that electrically contacts with the 1st conductor 4a, and this electric arc guide plate 17b has the jut than more close the 3rd conductor 4d direction in position of the terminal 4f of the otch of the 1st conductor 4a.The 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates.Among the figure, omitted driving mechanism etc.Figure 26 8(a) be to represent the fixed contact 4 that is connected with joint 5 and the oblique view of electric arc guide plate 17b, Figure 26 8(b simultaneously) be at Figure 26 8(a) in add the oblique view of insulant 15.

Electric arc after has just separated the contact is subjected to stretching consumingly, and the situation that arc resistance sharply increases is identical with the foregoing description 102.Then, when the moving contact face turns to the 1st conductor 4a top, though electric arc also is subjected to the active force stretched to joint 5 one laybacks, but, because the part of electric arc guide plate 17b is than more close the 3rd conductor 4d of the terminal 4f of otch one side, so electric arc is difficult to contact with the terminal 4f of the otch of insulant 15a and the 1st conductor 4a, promptly moves on the electric arc guide plate 17b.Therefore, insulant 15 and conductor damage reduce, and the rising that also can ease off the pressure.In addition, be positioned on the electric arc guide plate 17b, so electric arc contacts with arc extinguishing board 6 easily, be cooled, cut apart back arc extinguishing easily owing to cut off the electric arc spot in action later stage.Figure 26 9(a)～and Figure 26 9(l) be the profile of overlooking from above along the example of shape of the electric arc guide plate 17b of the B-B line of Figure 27 0.

In addition, shown in also can image pattern 271 like that, the 2nd conductor 4e is extended to the center of rotation direction, the 2nd conductor 4e that is fixing fixed contact 3 that replaces the fixed contact 4 shown in the foregoing description 101～103, parallel oppositely when making electric current by this part the 2nd conductor 4e by the electric current of movable contact 1 basically with closure state.Like this, the electromagnetic force that the current path of the 2nd conductor 4e produces will increase the active force that electric arc is stretched to joint 5 one laybacks, in addition, owing to acting on electromagnetic repulsive force between the 2nd conductor 4e of movable contact 1 and fixed contact 4 when closed, the velocity of rotation of movable contact 1 is increased, and the arc length after has just separated the contact increases rapidly, so, arc resistance sharply increases, and further improves current limiting performance.

Embodiment 104:

Figure 27 2 is end views that the circuit-breaker of embodiment 104 is in closure state, among the figure, the 19th and fixed contact 4 carry out the electrode of electric insulation.Figure 27 3 expression movable contacts 1 reach the situation of off-state, Figure 27 4(a) be the oblique view of the fixed contact 4 that is connected with joint 5, Figure 27 4(b) be the oblique view of representing joint 5, fixed contact 4, electrode 19 and insulant 15 simultaneously.Other structure is identical with embodiment 86, and explanation is omitted.

Below, its action is described.The contact-making surface of moving contact 2 also was in the state of the 1st conductor 4a that is connected with joint 5 below of fixed contact 4 after Figure 27 had just separated 5 expression contacts 2,3.Wherein, arrow is represented electric current, for simplicity, has omitted arc extinguishing board.The current path that 4 the 1st conductor 4a constitutes from joint 5 to fixed contact all is positioned at the top of electric arc A.As a result, the electromagnetic force to arcing of this current path generation is the active force that electric arc is stretched to joint 5 one laybacks.In addition, because the electric current of the 3rd conductor 4d by fixed contact 4 and the current opposite in direction of electric arc, so the electromagnetic force that the electric current by the 3rd conductor 4d produces also is the active force that electric arc is stretched to joint 5 one laybacks.Therefore, the electromagnetic force that produces of the electric current by this fixed contact 4 is the active force that electric arc is stretched to joint 5 one laybacks entirely.As a result, the electric arc after has just separated the contact is subjected to strong stretching, and arc resistance rises sharp.

In addition, as Figure 22 7(c) shown in like that, owing to pass through the influence of the electric current of the 2nd conductor 4e and the 3rd conductor 4d, there is magnetic field in space ZO on the 1st conductor 4a top, so, as Figure 27 3, when the moving contact face turns to the top of the 1st conductor 4a, electric arc also is subjected to the active force stretched to joint 5 one laybacks, is cooled off after contacting with electrode 19 above being configured in the insulant 15 that covers the 1st conductor 4a.Here, because electrode 19 and fixed contact 4 are in electric insulating state, so fixed contact 4 electric arc spot on one side to the last all is positioned on fixed contact 3 or the 2nd conductor 4e, as the electric arc A among this figure, can keep the length of electric arc very long.As a result, keeping the increase that can suppress internal pressure under the situation of high arc voltage.In addition, be guided on the electrode 19 owing to cut off the electric arc in action later stage, electric arc contacts with arc extinguishing board 6 easily, is cooled, cuts apart back arc extinguishing easily, so, the circuit breaker that can obtain having good current limiting performance and cut off performance.

Embodiment 105:

Figure 27 6 is end views that the circuit-breaker of embodiment 105 is in closure state.Among the figure, the 19th and the 1st conductor 4a is in the electrode of electric insulating state, fix will cover the otch of the 1st conductor 4a from movable contact 1 one sides the insulant 15a of terminal cover.The 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates.Among the figure, omitted driving mechanism etc.Figure 27 7(a) is the oblique view of representing the fixed contact 4, insulant 15 and the electrode 19 that are connected with joint 5 simultaneously; Figure 27 7(b) be end view.

Electric arc after the contact side is separated is stretched consumingly, and the situation that arc resistance raises sharp is identical with the foregoing description 104.Then, when the moving contact face turned to the top of the 1st conductor 4a, electric arc was subjected to the active force stretched to joint 5 one laybacks, with electrode 19 contacts.Because electrode 19 covers insulant 15a, so, can not damage insulant 15a, thus the pressure that also can suppress to take place.In addition, as Figure 27 6, owing to cut off in 19 minutes by electrode at the electric arc that cuts off between action contact latter half, being stretched respectively up and down of the 1st conductor 4a, so, high arc voltage can be obtained.In addition, because electric arc contact with arc extinguishing board 6 easily, be cooled, cut apart the easy arc extinguishing in back, so, can obtain having the current limiting performance of excellence and cut-out performance and can not damage the circuit breaker of the safety of container.

Embodiment 106:

Figure 27 8 is end views that the circuit-breaker of embodiment 106 is in closure state.Among the figure, the 19th and the 1st conductor 4a keeps the electrode of electric insulating state, passes the 1st conductor 4a at the terminal location than the otch of the 1st conductor 4a near joint 5 one sides, and expose at two up and down.The 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates.Among the figure, omitted driving mechanism etc.Figure 27 9(a) be the oblique view of representing the fixed contact 4, insulant 15 and the electrode 19 that are connected with joint 5 simultaneously, Figure 27 9(b) be along Figure 27 9(a) the profile of D-D line.

Electric arc after has just separated the contact is stretched consumingly, and the situation that arc resistance sharply raises is identical with 105 with the foregoing description 104.Then, when the moving contact face turned to the top of the 1st conductor 4a, electric arc was subjected to the active force stretched to joint 5 one laybacks, was extruded on the exhausted level thing 15a to be cooled off, and carried out current limliting.Further drive, make electric arc arrive electrode 19 after, further be cooled.After this, electric arc such shown in Figure 27 8 cut off by branch, being stretched respectively up and down of the 1st conductor 4a.In addition, owing to be insulated around the electrode, the reduced cross-sectional area of electric arc produces high arc voltage, and electric arc is difficult to fall back to fixed contact 3 directions, so, can keep high arc voltage always.In addition, after electric arc moves on the electrode 19, the rising that can also ease off the pressure, and, be positioned on the electrode 19 owing to cut off the electric arc spot in action later stage, so electric arc contacts with arc extinguishing board 6 easily, be cooled, cut apart back arc extinguishing easily.

Embodiment 107:

Figure 28 0 is embodiment 107.Among the figure, the 19th and the 1st conductor 4a keeps the electrode of the tubulose of electric insulation, passes the 1st conductor 4a in the position than the terminal 4f of the otch of the 1st conductor 4a near joint 5 one sides, exposes up and down.The 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates.Among the figure, omitted driving mechanism.Figure 28 1(a) be the oblique view of representing the fixed contact 4, insulant 15 and the electrode 19 that are connected with joint 5 simultaneously, Figure 28 1(b) be along Figure 28 1(a) the profile of D-D line.

Electric arc after has just separated the contact is stretched consumingly, and the situation that arc resistance sharply raises is identical with the foregoing description 104～106.Then, when the moving contact face turned to the top of the 1st conductor 4a, electric arc was subjected to the active force stretched to joint 5 one laybacks, is extruded on the insulant 15a and is cooled off, and carries out current limliting.When further driving, electric arc arrives on the electrode 19, still, because electrode 19 is tubuloses, so, further cooled off by air-flow again by pore.After this, electric arc is cut apart as Figure 28 0, being stretched respectively up and down of the 1st conductor 4a.In addition, owing to be insulated around the electrode, the sectional area of electric arc is reduced, produces high arc voltage, and electric arc is difficult to fall back to fixed contact 3 directions, so, can keep high arc voltage always.In addition, after electric arc turns on the electrode 19, owing to can reduce the pressure rising by the exhaust of electrode pore, and, so electric arc contacts with arc extinguishing board 6 easily, be cooled, cut apart the easy arc extinguishing in back owing to be positioned on the electrode 19 at the electric arc spot that disconnects the action later stage.

In addition, also can be shown in Figure 28 2 like that, the 2nd conductor 4e is extended to the center of rotation direction, the 2nd conductor 4e that is fixing fixed contact 3 that replaces the fixed contact 4 shown in the foregoing description 104～107, parallel oppositely when making electric current by this part the 2nd conductor 4e by the electric current of movable contact 1 basically with closure state.Like this, the electromagnetic force that the current path of the 2nd conductor 4e produces will increase the active force that electric arc is stretched to joint 5 one laybacks, in addition, owing between the 2nd conductor 4e of movable contact 1 and fixed contact 4, acting on electromagnetic repulsive force during closure state, the velocity of rotation of movable contact 1 is increased, and the arc length after has just separated the contact increases rapidly, so, arc resistance sharply increases, and further improves current limiting performance.

Embodiment 108:

Figure 28 3 is end views that the circuit-breaker of embodiment 108 is in closure state, among the figure, and the 20th, the cant board by insulator constitutes is clipped in the middle moving contact 2 and fixed contact 3 from both sides with narrow interval.The 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates, cant board 20 is positioned at its inboard with respect to the almost whole zone of otch.State when Figure 28 4 expression movable contacts 1 disconnect, Figure 28 5(a) be the oblique view of the fixed contact 4 that is connected with joint 5, Figure 28 5(b) be the oblique view of representing joint 5, fixed contact 4, insulant 15, cant board 20 and arc extinguishing board 6 simultaneously.Other structure is identical with embodiment 86, and explanation is omitted.

Below, its action is described.Figure 28 6 is states of the below of the 1st conductor 4a that is connected with joint 5 that the contact-making surface of moving contact 2 also was in fixed contact 4 after had just separated contact 2,3.Wherein, arrow is represented electric current, for the sake of simplicity, has omitted cant board 20 and arc extinguishing board 6.The current path that 4 the 1st conductor 4a constitutes from joint 5 to fixed contact all is positioned at the top of electric arc A.As a result, the electromagnetic force to arcing of this current path generation is exactly the active force that electric arc is stretched to joint 5 one laybacks.In addition, because the electric current of the 3rd conductor 4d by fixed contact 4 and the current opposite in direction of electric arc, so the electromagnetic force that the electric current by the 3rd conductor 4d produces also is the power that electric arc is stretched to joint 5 one laybacks.Therefore, the electromagnetic force that produces of the electric current by fixed contact 4 is the active force that electric arc is stretched to joint 5 one laybacks entirely.As a result, the electric arc after has just separated the contact is stretched consumingly, and arc resistance raises sharp.

Figure 28 7 is near profiles the contact when joint 5 one side direction movable contacts 1 direction is seen.Among the figure, the state in the movable contact 1 expression rotation process.The electric arc that produces between the contact 2,3 is by narrow arranged spaced in cant board 20 contacts of both sides, contact (after, the face that cant board is contacted with electric arc is called the arc extinguishing face) and after being cooled off, the arc voltage rising.In addition, at this moment,, promote driving to electric arc because the pressure rises of the gas that cant board 20 is emitted also makes the velocity of rotation of movable contact 1 accelerate.

In addition, as Figure 22 7(c) shown in, because there is magnetic field in the influence of the electric current by the 2nd conductor 4e and the 3rd conductor 4d at the upper space ZO of the 1st conductor 4a, still, little than the 1st conductor 4a below.Therefore, if image pattern 283 is provided with arc extinguishing board 6 like that, will be by the 1st conductor 4a produces above it electric arc be absorbed to the magnetic field that the opposite direction of joint 5 drives, and the electric current of electric arc itself also will strengthen driving magnetic field.Therefore, though shown in Figure 28 8 like that, the moving contact face turns to the top of the 1st conductor 4a, electric arc also is subjected to the power to joint 5 one side effects, the insulant 15a that is extruded to the terminal that covers otch goes up and is cooled off.Among the figure, arrow is represented electric current, for simplicity, has omitted cant board 20 and arc extinguishing board 6.As a result, the arc resistance that has sharply raise after has just separated the contact further increases, and keeps high arc voltage.In addition, even because the moving contact face turns to the top of the 1st conductor 4a, electric arc also contacts with cant board 20, so, because the effect of above-mentioned air pressure can prevent that the velocity of rotation of movable contact 1 from slowing down, thus the circuit breaker that can obtain having excellent current limiting performance and cut off performance.

Embodiment 109:

Figure 28 9 is end views that the circuit-breaker of embodiment 109 is in closure state.The 20th, with the narrow cant board that is disposed on the both sides, contact, the 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates, cant board 20 partly is positioned at its inboard in the beginning of this otch.

Because cant board 20 has partly blocked arc extinguishing board 6 in the beginning of the otch of arc extinguishing board 6 and has directly contacted with electric arc, so, have the effect of the fusion that weakens this part arc extinguishing board 6 and strong driving magnetic field, thereby can prevent that electric arc from beginning part generation bridge circuit at the otch of arc extinguishing board 6.In addition because the arc diameter of initial arc can not enlarge, so, can strengthen the contact just separated after the actuating force of high-intensity magnetic field.Also have, because the effect of the air pressure of cant board 20 can prevent that the velocity of rotation of movable contact 1 from slowing down, so, the circuit breaker that can obtain having excellent current limiting performance and cut off performance.

Embodiment 110:

Figure 29 0 is the end view of the circuit-breaker of embodiment 110 when being in closure state.The 20th, with the narrow cant board that is disposed on the both sides, contact, the 6th, have the arc extinguishing board that does not hinder movable contact 1 to rotate, cant board 20 partly is positioned at its inboard in the top of this otch.

After just separate the contact, the high-intensity magnetic field that fixed contact 4 the produces electric arc that stretches rapidly then, turns to the top of the 1st conductor 4a when the moving contact face, when electric arc is driven to cant board 20 places, cooled off, arc diameter is dwindled forcibly simultaneously, further crosses cant board 20 when electric arc and arrives arc extinguishing board 6, after arc diameter enlarges, just be difficult to fall back, so it is fine to cut off performance to moving contact 2 one sides.In addition, because fusion can not taken place by the part that cant board 20 blocks in arc extinguishing board 6, can prevent to weaken the reinforced effects of the driving magnetic field of the 1st conductor 4a top, and because the pressure rises that cant board 20 causes, can prevent that above the 1st conductor 4a the velocity of rotation of movable contact 1 from slowing down, so, the circuit breaker that can obtain having excellent current limiting performance and cut off performance.

Embodiment 111:

Figure 29 1(a) is the end view of the major part of embodiment 111.The 20th, with the narrow cant board that is disposed on the both sides, contact, the 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates, cant board 20 is positioned at its inboard in the almost whole zone of otch, the thickness of slab of the part that can not directly contact with electric arc that arc extinguishing board 6 is blocked by this cant board 20, specific energy is thick with the part that electric arc directly contacts.Figure 29 1(b) be from top 291(a with the aid of pictures) vertical view.Figure 29 2(a)～and Figure 29 2(d) be the example of the shape of the above-mentioned arc extinguishing board that partly changes thickness of slab.

Electric arc after has just separated the contact is stretched consumingly, and the situation that arc resistance raises sharp is identical with the foregoing description 86～110.Then, when the moving contact face moves to the top of the 1st conductor 4a, as Figure 22 7(c) shown in like that, this regional driving magnetic field will weaken, but, if arc extinguishing board 6 is arranged on the top of the 1st conductor 4a, will absorb that the 1st conductor 4a produces above it with electric arc to magnetic field that the opposite direction of joint 5 drives, and the electric current of electric arc itself also can strengthen driving magnetic field.But, the situation of such big electric current during for short circuit, arc extinguishing board 6 will soon reach magnetic saturation, can not strengthen the electric arc driving magnetic field very effectively.If use Figure 29 1(a), 291(b) and Figure 29 2(a)～292(d) such otch begins the bigger arc extinguishing board of segment thickness 6, just can strengthen the electric arc driving magnetic field of the 1st conductor 4a top, and, being not easy to take place magnetic saturation, electric arc will be stretched more consumingly.In addition, than the inboard of thickness portion cant board 20 is arranged at thickness of slab, can directly not contact with electric arc, so, can not produce fusion, can prevent to weaken the reinforced effects of driving magnetic field, simultaneously, even the interval of this part is less, also because arc extinguishing board 6 can keep original interval with the part that driven electric arc directly contacts, so, can prevent that electric arc from producing bridge circuit.When during than the interval of thickness portion, can further delaying magnetic saturation near thickness of slab.In addition, because the pressure rises of the gas that cant board 20 is emitted can prevent that above the 1st conductor 4a the velocity of rotation of movable contact 1 from slowing down.

Embodiment 112:

Figure 29 3(a) is the end view of the major part of embodiment 112.The 20th, the cant board of both sides, contact is set with narrow interval, the 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates, cant board 20 is positioned at its inboard in the almost whole zone of this otch, the part that can not directly contact with electric arc that arc extinguishing board 6 is blocked by this cant board 20 between the upper and lower every, than the part of the direct contact of arc energy between the upper and lower every little, the configuration of arc extinguishing board 6 is fan-shaped distribution.Figure 29 3(b) is the vertical view of the present embodiment seen from above.Figure 29 4(a) and Figure 29 4(b) be the configuration above-mentioned arc extinguishing board other example.

Electric arc after has just separated the contact is stretched consumingly, and the situation that arc resistance sharply raises is identical with foregoing embodiment.Then, when the moving contact face moves to the top of the 1st conductor 4a, as Figure 22 7(c) shown in like that, this regional driving magnetic field weakens, but, if arc extinguishing board 6 is configured in the top of the 1st conductor 4a, will absorb that the 1st conductor 4a produces above it with electric arc to magnetic field that the opposite direction of joint 5 drives, simultaneously, the electric current of electric arc itself also can strengthen driving magnetic field.If it is 294(b 294(a 293(b image pattern 293(a)))) such, the arc energy of arc extinguishing board 6 is directly remained unchanged at the interval of the part of contact, and the part that will be blocked by cant board 20 between the upper and lower every reducing, the bridge circuit of electric arc just can not take place, and near the contact, driving magnetic field is concentrated, and can delay magnetic saturation, so, can consumingly near the electric arc the contact be driven to joint 5 directions constantly, thereby can reduce the contact loss.

In addition, because arc extinguishing board 6 fusion can not taken place by the part that cant board 20 blocks, can prevent to weaken the reinforced effects of the driving magnetic field of the 1st conductor 4a top, simultaneously, because the pressure rises that cant board 20 causes can prevent that above the 1st conductor 4a the velocity of rotation of movable contact 1 from slowing down.

Embodiment 113:

Figure 29 5 is end views of the major part of embodiment 113.The 20th, with the narrow cant board that is disposed on the both sides, contact, the 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates, cant board 20 is positioned at its inboard in the almost whole zone of otch.On cant board 20, can not see directly that from the arc extinguishing face that can contact the position of arc extinguishing board 6 offers porose 20a with electric arc, Figure 29 6 is oblique views that the part of cant board 20 and arc extinguishing board 6 constitutes.

Figure 29 7 is near profiles the contact when joint 5 one side direction movable contacts 1 direction is seen.Among the figure, movable contact 1 is in the state in the rotation.The electric arc that produces between the contact 2,3 touches with narrow when being disposed on the cant board 20 of both sides, contact, and electric arc is cooled off, and at this moment, the gas that cant board 20 is emitted will make the local area pressure to arc extinguishing board 6 sharply rise.If on cant board 20, have illustrated hole 20a, will on illustrated arrow path, produce air-flow, thereby can relax the rapid rising of above-mentioned local area pressure.

In addition, by perforate 20a on cant board 20, can increase the insulation distance between the contact, thereby, arc extinguishing face charing that causes in the time of can fully reducing by cut-out and the danger that under off-state, causes 2,3 insulation breakdowns in contact attached to the carbide on the arc extinguishing face, metal melt etc.

The same with foregoing embodiment 86～112, fusion is not taken place by the part that cant board 20 blocks in arc extinguishing board 6, can prevent to weaken the reinforced effects of the 1st conductor 4a top driving magnetic field, simultaneously, because the pressure rises that cant board 20 causes can also prevent that the velocity of rotation of movable contact 1 above the 1st conductor 4a from slowing down.

Embodiment 114:

Figure 29 8 is oblique views of the major part of embodiment 114.Among the figure, the 20th, with the narrow cant board that is disposed on the both sides, contact, the 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates, cant board 20 is configured in the inboard of this otch.The back side of the arc extinguishing face of cant board 20 is provided with groove, and arc extinguishing board 6 inserts and remains in this groove from joint 5 one sides.

Like this, arc extinguishing board 6 is remained on the cant board 20, just do not need before to have kept the arc extinguishing side plate of arc extinguishing board 6.So, not only reduced the structure component count, and the maintenance method is also simple, so, assembling easily.In addition, the same with foregoing embodiment, can prevent to weaken the reinforced effects of the 1st conductor 4a top driving magnetic field.Simultaneously, because the pressure rises that cant board 20 causes can prevent that the velocity of rotation of movable contact 1 above the 1st conductor 4a from slowing down, thereby can obtain having excellent current limiting performance and cut off performance and the circuit breaker of the easy assembling of cheapness.

Embodiment 115:

Figure 29 9 is oblique views of the major part of embodiment 115.Among the figure, the 20th, with the narrow cant board that is disposed on the both sides, contact, the 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates, cant board 20 is configured in the inboard of this otch.Be provided with groove at cant board 20 near joint 5 one sides, arc extinguishing board 6 inserts and remains in this groove from joint 5 one sides.

Like this, arc extinguishing board 6 is remained on the cant board 20, just do not needed the arc extinguishing side plate of the maintenance arc extinguishing board 6 that has earlier, not only reduced structure member, and the maintenance method is also simple, so assembling easily.In addition, the same with foregoing embodiment 86～114, can prevent to weaken the reinforced effects of the 1st conductor 4a top driving magnetic field, simultaneously, because the pressure rises that cant board 20 causes, the velocity of rotation that can prevent movable contact 1 above the 1st conductor 4a slows down, thereby can obtain having excellent current limiting performance and cut off performance and the cheap easy circuit breaker of assembling.

Embodiment 116:

Figure 30 0 is the oblique view of the major part of embodiment 116.Among the figure, the 20th, with the narrow cant board that is disposed on the both sides, contact, the 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates, cant board 20 is configured in the inboard in this otch.The 7th, clamp and keep the arc extinguishing side plate of arc extinguishing board 6 from both sides.Cant board 20 has unci, with the top that this unci catches on arc extinguishing side plate 7, is hanging and maintains.Figure 30 1 catches on unci the method that the bottom of arc extinguishing side plate 7 keeps in other embodiment.In addition, also can all be provided with unci at two, upper and lower.

Like this, cant board 20 is remained on the arc extinguishing side plate 7, not only constitute simply, and assembling easily.In addition, the same with foregoing embodiment 86～115, can prevent to weaken the reinforced effects of the 1st conductor 4a top driving magnetic field, simultaneously, because the pressure rises that cant board 20 causes, the velocity of rotation that can prevent movable contact 1 above the 1st conductor 4a slows down, thereby can obtain to have excellent current limiting performance and cut off performance and the circuit breaker of easy assembling.

In addition, shown in also can image pattern 302 like that, the 2nd conductor 4e is extended to the center of rotation direction, the 2nd conductor 4e that is fixing fixed contact 3 that replaces the fixed contact 4 shown in the foregoing description 108～116, parallel oppositely when making electric current by this part the 2nd conductor 4e by the electric current of movable contact 1 basically with closure state.Like this, the electromagnetic force of the current path of the 2nd conductor 4e generation will increase the active force that electric arc is stretched to joint 5 one laybacks.In addition, between the 2nd conductor 4e of movable contact 1 and fixed contact 4, acting on electromagnetic repulsive force during owing to closure state, the velocity of rotation of movable contact 1 is increased, the very fast growth of arc length after has just separated the contact, so arc resistance sharply increases, further improve current limiting performance.

Embodiment 117:

Figure 30 3 is the circuit-breaker of embodiment 117 end views when being in closure state, among the figure, the 20th, the cant board that with narrow interval the contact is clipped in the middle, is made of insulator from both sides, the 6th, have the arc extinguishing board that does not hinder the otch that movable contact 1 rotates, the almost whole zone of cant board 20 relative these otch is positioned at its inboard.In addition, Figure 30 4 is end views of shape one example of arc extinguishing board 6, and Figure 30 5 is near represent when joint 5 one side direction movable contacts 1 direction is seen the contact of structure of arc extinguishing board 6 and cant board 20 profiles.Be located in the hole of offering on the jut inserting side riser 20 of otch inboard of arc extinguishing board 6, stretch out the arc extinguishing face a little.The state that Figure 30 6 expression movable contacts 1 disconnect, the 1st conductor 4a that is connected with joint 5 of fixed contact 4 is positioned at the below of the contact-making surface of moving contact 2.Figure 30 7(a) be the oblique view of the fixed contact 4 that is connected with joint 5, Figure 30 7(b) be the oblique view of representing joint 5, fixed contact 4, insulant 15, cant board 20 and arc extinguishing board 6 simultaneously.Other structure is identical with embodiment 86, and explanation is omitted.

Below, its action is described.The contact-making surface of moving contact 2 also was in the state of the 1st conductor 4a that is connected with joint 5 below of fixed contact 4 after Figure 30 had just separated 8 expression contacts 2,3.Among the figure, arrow is represented electric current, for simplicity, has omitted cant board 20 and arc extinguishing board 6.The current path that 4 the 1st conductor 4a constitutes from joint 5 to fixed contact all is positioned at the top of electric arc A.As a result, the electromagnetic force to arcing of this current path generation is the active force that electric arc is stretched to joint 5 one laybacks.In addition, because the electric current of the 3rd conductor 4d by fixed contact 4 and the current opposite in direction of electric arc, so the electromagnetic force that the electric current by the 3rd conductor 4d produces also is the active force that electric arc is stretched to joint 5 one laybacks.Therefore, the electromagnetic force that produces of the electric current by fixed contact 4 all is the active force that electric arc is stretched to joint 5 one laybacks.As a result, the electric arc after has just separated the contact is stretched consumingly, and arc resistance raises sharp.

In Figure 30 9, the state of expression movable contact 1 in rotation process.The electric arc A of 2,3 generations in contact is by being cooled off with contact (after, the face that cant board 20 is contacted by electric arc is called the arc extinguishing face) with the cant board 20 of narrow arranged spaced in the both sides, contact, and arc voltage rises.In addition,, can also increase cooling effect, relax pressure and rise because electric arc contacts with the jut that stretches out a little than arc extinguishing face of arc extinguishing board 6.At this moment, because the pressure rises of the gas that cant board 20 is emitted is accelerated the velocity of rotation of movable contact 1, also can promote the driving of electric arc.

In addition, as Figure 22 7(c) shown in like that because there is magnetic field in the influence of the electric current by the 2nd conductor 4e and the 3rd conductor 4d at the superjacent air space ZO of the 1st conductor 4a, still, little than the 1st conductor 4a below.Therefore,, arc extinguishing board 6 is set if as Figure 30 3, just can absorb that the 1st conductor 4a produces above it with electric arc to the magnetic field that the opposite direction of joint 5 drives, simultaneously, the electric current of electric arc itself also can strengthen driving magnetic field.Therefore, though shown in Figure 30 9 like that, the moving contact face turns to the top of the 1st conductor 4a, electric arc also is subjected to the active force stretched to joint 5 one laybacks, is extruded to the insulant 15a that covers the slit terminal and goes up and cooled off.Among the figure, arrow is represented electric current, for simplicity, has omitted cant board 20 and arc extinguishing board 6.As a result, the rapid afterwards arc resistance that rises has just been separated because the cooling effect of cant board 20 and arc extinguishing board 6 further increases in the contact, and keeps high arc voltage.At this moment, electric arc can relax pressure and rise with after arc extinguishing board 6 contacts, and prevents to damage container.In addition, even the moving contact face turns to the top of the 1st conductor 4a, because electric arc can also contact with cant board 20, so, because the effect of above-mentioned air pressure can prevent that the velocity of rotation of movable contact 1 from slowing down, thus the circuit breaker that can obtain having excellent current limiting performance and cut off performance.

In addition, because cant board 20 can utilize the jut of arc extinguishing board 6 to keep, so, can obtain to assemble easy, cheap circuit breaker.

Embodiment 118:

Figure 31 0 is near the profile embodiment 118 contacts.The 20th, with the narrow cant board that is disposed on the both sides, contact in the many places perforate, the 6th, have and do not hinder otch that movable contact 1 rotates and the arc extinguishing board that has jut in the otch inboard, the jut of arc extinguishing board 6 is inserted in the hole of side plate 20.In addition, among the figure, the jut of arc extinguishing board 6 is in the outside of arc extinguishing face.

In the present embodiment, also the same with foregoing embodiment, because the structural reason of fixed contact 4, after just separated the contact, arc voltage rose sharp.Then, electric arc with cooled off after cant board 20 contacts, still because the jut of arc extinguishing board 6 is in the outside of arc extinguishing face, so electric arc contacts with the corner in the hole of arc extinguishing face easily and melts, so, can increase cooling effect.In addition, owing to electric arc also can contact with the jut of arc extinguishing board 6, so, can reduce the circuit breaker pressure inside, and the fusion of arc extinguishing board 6 is seldom.In addition, even movable contact 1 turns to the top of the 1st conductor 4a,, thereby can obtain to have the little circuit breaker of internal pressure of excellent current limiting performance because the gas pressure of cant board 20 can prevent that also the velocity of rotation of movable contact 1 from slowing down.

In addition, in the foregoing description 117 and 118, also can make the jut of arc extinguishing board 6 and arc extinguishing face in the same plane.At this moment, because electric arc also contacts with arc extinguishing board 6 with when cant board 20 contacts, so, can cool off and reduce pressure effectively at the beginning.Not only the melting phenomenon of arc extinguishing board 6 is few, and can keep its effect constantly.

In addition, shown in also can image pattern 311 like that, the 2nd conductor 4e is extended to the center of rotation direction, the 2nd conductor 4e that is fixing fixed contact 3 that replaces the fixed contact 4 shown in the foregoing description 117 and 118, parallel oppositely when making electric current by this part the 2nd conductor 4e by the electric current of movable contact 1 basically with closure state.Like this, the electromagnetic force that the current path of the 2nd conductor 4e produces will increase the active force that electric arc is stretched to joint 5 one laybacks, in addition, owing between the 2nd conductor 4e of movable contact 1 and fixed contact 4, acting on electromagnetic repulsive force during closure state, the velocity of rotation of movable contact 1 is increased, the very fast growth of arc length after has just separated the contact, so, arc resistance increases rapidly, further improves current limiting performance.

In addition, the situation of circuit breaker has been described in the foregoing description 86～118, still, also can be used for other switch, and can obtain the effect identical with the foregoing description 86～118.

Embodiment 119:

Below, with reference to description of drawings embodiments of the invention 119.Figure 31 2 is the switches as embodiment 119, the end view of arc extinguishing board when the circuit-breaker that container is cut open is in closure state, Figure 31 3 is end views that the circuit-breaker of Figure 31 2 becomes off-state, the part identical or suitable with Fig. 4～Figure 10 is marked with identical symbol, and the repetitive description thereof will be omitted.

Among the figure, the 107th, the 1st conductor that is connected with the joint 105 of power-supply system one side, when closure state, shown in Figure 31 2, the 1st conductor 107 is positioned at the top that constitutes the conductor 103a that repels contact 103, extends to horizontal direction.The 108th, connect above-mentioned the 1st conductor 107 and the 2nd conductor that repels contact 103, the 2nd conductor 108 is made of the pliability conductor that can not hinder above-mentioned repulsion contact 103 to rotate.Therefore, above-mentioned the 1st conductor 107 and above-mentioned the 2nd conductor 108 constitute the conductor that above-mentioned repulsion contact 103 and 105 maintenances of above-mentioned joint are electrically connected.

Figure 31 4 is plane graphs of the connection structure of repulsion contact among Figure 31 2 and the 1st conductor and the 2nd conductor, and Figure 31 5 is front elevations of Figure 31 4, and Figure 31 6 is oblique views of Figure 31 4.

In these figure, 170 are provided in a side of the slit that slightly is the U font on the 1st conductor 107, and this slit 170 is established for the switch motion of allowing movable contact 101 and repulsion contact 103.107a and 107b are two side conductors of above-mentioned the 1st conductor 107 that forms owing to above-mentioned slit 170,108a and 108b constitute about 108 two pliability conductors of the 2nd conductor, and these two pliability conductor 108a are connected the open end (end of the 1st reverse conductor 107 of joint 5) of the slit 170 of above-mentioned the 1st conductor 107 with 108b with repulsion contact 103.The 118th, insulant is on above-mentioned the 1st conductor of seeing from the surface of moving contact 102 when covering movable contact 101 and disconnecting 107.This insulant 118 constitutes an integral body by insulant 118a, insulant 118b and insulant 118c, and insulant 118a covers the surface of the 1st conductor 107; Insulant 118b covers two medial surfaces of the slit 170 of above-mentioned the 1st conductor 107; Insulant 118c covers the inner face of close joint 105 1 sides of above-mentioned slit 170.Here, above-mentioned repulsion contact 103 can rotate under the power effect that the direction greater than hank knotting spring 109 that is directed downwards makes progress, and by the maximum position that disconnects of brake 112 restrictions.Other structure is identical with Fig. 4 and Fig. 5.

Below, its action is described.

Under the closure state shown in Figure 31 2, moving contact 102 and repel contact 104 under to the effect that presses the spring (not shown) of repelling hank knotting spring 109 that contact 103 applies the rotatory force that direction makes progress and movable contact 101 is in contact with one another together under the contact pressure of appointment.This contact pressure is according in common load current and the such little current conditions of overload electric current, moving contact 102 and repel contact 104 and can not separate setting.In little failure of current action, the same with the circuit-breaker that has earlier, 101 of movable contacts rotate upward, repel the position that contact 104 remains on closure state.

Figure 31 7 is end views of circuit-breaker electrode when being in closure state, among the figure, represents from joint 5 to movable contact 101 current path with thin arrow.Electric current flows into from joint 5, flows out near the center of rotation P1 of movable contact 101.

When by big electric current such as short circuit current, because by movable contact 101 with repel the current opposite in direction of contact 103, so the interaction electromagnetic repulsive force becomes respectively to the power F that disconnects directive effect, and is identical with the circuit-breaker that has earlier.

But in the electrode structure of circuit-breaker of the present invention, by electric current that constitutes the conductor 103a that repels contact 103 and the current opposite in direction of passing through the 1st conductor 107, and the conductor 103a that repels contact 103 is positioned at the below of the 1st conductor 107.So, between above-mentioned repulsion contact 103 and the 1st conductor 107, also act on electromagnetic repulsive force, and this electromagnetic repulsive force is the directed force F that above-mentioned repulsion contact 103 is rotated.In addition, because the electric current by the 2nd conductor 108 and repel magnetic field that the conductor 103a of contact 103 partly produces on paper from interior sensing outside, so the power that this magnetic field produces also is to make the active force that repels contact 103 rotations.

That is, not only movable contact 101, and all produce the electromagnetic force that above-mentioned repulsion contact 103 is rotated to the disconnection direction from joint 105 to all current paths that repel the contact 103.Therefore, utilize the electrode structure of circuit-breaker of the present invention, can increase the electromagnetic force that above-mentioned repulsion contact 103 is rotated to the disconnection direction significantly.As previously mentioned, disconnect the increase of the distance between the initial stage contact 102 and 104, the velocity of rotation of the little repulsion contact 103 of the moment of inertia is had very big contribution.Therefore, according to the electrode structure of circuit-breaker of the present invention, the opening speed of contact increases significantly, and arc voltage rises sharp.

Figure 31 8 is end views of the electrode of state after the circuit-breaker of embodiment 119 has just been separated in the contact.

After just separate the contact, electric arc A takes place below the 1st conductor 107, at this moment, the magnetic field of the electric current generation by above-mentioned the 1st conductor 107 → the 2nd conductor 108 → repulsions contact 103 is on paper outside interior sensing.This magnetic field applies the power Fm that direction is pointed to joint 5 directions to the electric arc A that repels on the contact 104.

That is, the electromagnetic force of all electric currents generations between joint 5 and the repulsion contact 104 can be elongated electric arc A.Therefore, arc length is greater than the distance between the contact, thereby makes arc voltage rise sharp.

Figure 31 9 is the movable contact 101 among Figure 31 8 and the end view of electrode when repelling contact 103 and reaching maximum off-state.

Along with movable contact 101 and repulsion contact 103 rotate to disconnecting direction, above-mentioned movable contact 101 increases with the distance of above-mentioned repulsion contact 103, so, the electromagnetic repulsive force of 101 pairs of above-mentioned repulsion contacts 103 of above-mentioned movable contact weakens, but, the position relation of above-mentioned repulsion contact 103 and the 1st conductor 107 and the 2nd conductor 108 is not big to be changed, so the electromagnetic force of 108 pairs of above-mentioned repulsion contact 103 effects of the 1st conductor 107 and the 2nd conductor reduces not quite.Therefore, even above-mentioned movable contact 101 and above-mentioned repulsion contact 103 are disconnected to maximum rating, above-mentioned repulsion contact 103 also can not reduced a lot, to the power that disconnects the direction rotation even electric current reduces, repel contact 103 and also be difficult to fall back to returning, can keep for a long time maximum contact spacing from.Therefore, keep maximum arc voltage easily.

Usually, under the such large-current electric arc situation of short circuit current, the root of electric arc is along the metal vapors stream of the direction ejection contact evaporation of vertical contact face, the main composition thing that this metal vapors stream is electric arc A from the contact.

In present embodiment 119, shown in Figure 31 9 like that, be ejected on the insulant 118 that covers on the 1st conductor 107 from the metal vapors stream of the surface ejection of moving contact 102 after, electric arc A is cooled.In addition, as previously mentioned, all current paths to the electric arc A of the 1st conductor 107 belows to joint 5 directive effect electromagnetic forces.As a result, electric arc A be extruded to the 1st conductor 107 insulant 118 particularly the insulant 118c of slit 107 inner faces of the 1st conductor 107 go up and be subjected to cooling effect.Because cooling effect, arc voltage further increases.

As mentioned above,, after just separate the contact, arc voltage is sharply risen, and keep high arc voltage according to present embodiment 119, so, can obtain to have the circuit-breaker of excellent current limiting performance.

Embodiment 120:

Figure 32 0 is the end view that the circuit-breaker of embodiment 120 is in the electrode of closure state.

In the foregoing description 119, illustrate and illustrated movable contact 101 and repel contact 103 when being in closure state, the contact-making surface of moving contact 102 and repulsion contact 104 is positioned at the situation of the 1st conductor 107 tops, but in present embodiment 120, when the closure state shown in Figure 32 0, the 1st conductor 107 is positioned at the top of the conductor 103a that repels contact 103, the top that also is positioned at moving contact 102 and repels the contact-making surface of contact 104.When adopting such structure, also can obtain the effect identical with the situation of the foregoing description 119.

In addition, according to present embodiment 120, even under the situation of repelling the little failure of current that contact 103 is failure to actuate, shown in Figure 32 1 like that, above-mentioned repulsion contact 103 also is positioned at the below of the 1st conductor 107, and, below the 1st conductor 107, also have electric arc A.All this electric arc A is applied electromagnetic force to joint 5 directions from the 1st conductor 107 to all current paths that repel contact 103,, and be extruded on the insulant 118 of the 1st conductor 107 and cooled off so electric arc A is elongated to joint 5 directions.Therefore, adopt the such electrode structure of embodiment 120, the cut-out performance in the time of can improving little failure of current.

Embodiment 121:

Figure 32 2 is end views that the circuit-breaker of embodiment 121 is in the electrode of closure state.

In present embodiment 121, when closure state the 1st conductor 107 be positioned at movable contact 101 conductor 101a above.When adopting such structure, also can obtain same effect.

In addition, according to the present invention, when the closing of contact, the sense of current of conductor 101a by the 1st conductor 107 and movable contact 101 is identical, attract each other, so, the initial stage when short circuit current cuts off, the power that above-mentioned movable contact 101 is rotated to the disconnection direction is not only the electromagnetic repulsive force of above-mentioned repulsion contact 103, also has the electromagnetic force by the electric current generation of the 1st conductor 107.Therefore, the initial stage when short circuit current cuts off, the rotation of movable contact 101 is accelerated, increase contact separation speed, improve current limiting performance.

In addition, shown in above-mentioned embodiment 119,120 and 121 like that, joint 105 and the 1st conductor 107 are on same, then also movable contact 101, repulsion contact 103 and electric arc are applied and pass through the same electromagnetic action of electric current of the 1st conductor 107 by the electric current of above-mentioned joint 105, thereby, can further improve current limiting performance.

Embodiment 122:

Figure 32 3 is end views that the circuit-breaker of embodiment 122 is in the electrode of closure state.

In present embodiment 122, make joint 105 be positioned at the top of the 1st conductor 107, utilize the 3rd conductor 119 of vertical direction that joint 5 and above-mentioned the 1st conductor 107 are linked together, simultaneously, cover when being in off-state the position of the 3rd conductor 119 that can see from moving contact 102 1 sides with insulant 118e.Adopt such structure, also can obtain the effect identical with the situation of the foregoing description 119.

In addition, according to present embodiment 122, under the off-state of the movable contact shown in Figure 32 3 101, electric current by the 3rd conductor 119 and the current opposite in direction by electric arc A are repelled mutually, so, the electric arc A of the 1st conductor 107 tops extends to joint 5 directions, because the effect of the electric current of above-mentioned the 3rd conductor 119 is pushed to returning again, makes electric arc A not reach power supply dividing plate 120.Therefore, can alleviate the damage of power supply dividing plate 120, in addition, can also reduce from the hot gas of the electric arc of steam vent 117 dischargings.

Figure 32 4 is arc extinguishing end views partly of the variation circuit-breaker of embodiment 122.In this variation, with the insulation of above-mentioned the 3rd conductor 119 of above-mentioned power supply dividing plate 120 double as, replace the insulant 118e of the 3rd conductor 119 among Figure 32 3, at this moment, also can obtain same effect.

Embodiment 123:

Figure 32 5 is end views that the circuit-breaker of embodiment 123 is in the electrode of off-state.

In present embodiment 123, opposite with the situation of the foregoing description 122, make joint 5 be positioned at the below of the 1st conductor 107, the 3rd conductor 119 by vertical direction links together joint 105 and above-mentioned the 1st conductor 107, adopt such structure, also can obtain the effect identical with the situation of the foregoing description 119.

In addition, identical by the electric current of the 3rd conductor 119 shown in Figure 32 5 according to present embodiment 123 with the sense of current that passes through electric arc A, attract each other.As a result, increase the electromagnetic force that the electric arc A with the 1st conductor 107 belows stretches to joint 5 directions, electric arc A is expressed to consumingly on the insulant 118 and is cooled off, and has improved cooling effect, therefore, can improve current limiting performance.

Embodiment 124:

Figure 32 6 is end views that the circuit-breaker of embodiment 124 is in the electrode of off-state.

In present embodiment 124, make in the structure of Figure 32 5 by what the 3rd conductor 119 and the 1st conductor 107 linked together to be positioned at joint 105 below above-mentioned the 1st conductor 107, repel the surface of the repulsion contact 104 of contact 103 when being in closure state.Adopt such structure, also can obtain the effect identical with the situation of the foregoing description 123.

In addition, according to present embodiment, when the little failure of current shown in Figure 32 6, even when repelling contact 103 and being failure to actuate, the electric current by joint 5 also produces the electromagnetic force that stretches to joint 5 directions to the electric arc A on the above-mentioned repulsion contact 104.Therefore, use the electrode structure of present embodiment 124, can increase the electromagnetic force of stretching electric arc A, thereby can obtain to improve the effect of little current shut-off performance.

Embodiment 125:

Figure 32 7 is end views that the circuit-breaker of embodiment 125 is in the electrode of off-state, and Figure 32 8 is end views that the repulsion contact of Figure 32 7 is in the electrode of off-state.

In present embodiment 125, in the structure of utilizing the 3rd conductor 119 that joint 105 and the 1st conductor 107 are linked together, make above-mentioned joint 5 be positioned at the below of the 1st conductor 107, and, when the repulsion contact 103 shown in Figure 32 7 is in the close position, be positioned at the below on the surface of repelling contact 104, when repelling contact 103 and reaching maximum off-state, shown in Figure 32 8, above-mentioned joint 5 more leans on the top than the 103b place that repels contact 103 at least.Adopt such structure, also can obtain the effect identical with the situation of the foregoing description 123.

In addition, according to present embodiment 125, when repelling the maximum off-state of contact 103, owing to repel the below that the 103b place of contact 103 is positioned at joint 5, so, the 103b place that repels contact 103 is produced to the electromagnetic force that disconnects directive effect by the electric current of this joint 5.Therefore, make and repel electromagnetic force that movable contact 101 that contact 103 disconnects and the 1st conductor 107 produce and rotate and reduce with repelling contact 103, still, the electromagnetic force that the electric current by above-mentioned joint 105 produces can be carried out to a certain degree compensation to reducing part.As a result, can obtain the more excellent circuit-breaker of current limiting performance.

Figure 32 9 is that the variation circuit-breaker of embodiment 125 has only movable contact to be in the end view of the electrode of off-state when little failure of current, and Figure 33 0 is the movable contact among Figure 32 9 and repel the end view that contact all is in the electrode of off-state when big failure of current.

In this variation, make the center of rotation P2 that repels contact 103 be positioned at the below of joint 105, can obtain the effect identical with the foregoing description 125.

Embodiment 126:

Figure 33 1 is the end view that the circuit-breaker of embodiment 126 is in the electrode of closure state.

In present embodiment 126, use the 2nd conductor 108 with the 1st conductor 107 with repel being connected of contact 103, at the center of rotation P2 of above-mentioned repulsion contact 103 with repel between the contact 104 and carry out.Adopt such structure, also can obtain the effect identical with the situation of the foregoing description 119.In addition, in present embodiment 126,, all be to flow to repelling contact 104 directions from center of rotation P2 by the electric current of above-mentioned repulsion contact 103.

Here, the magnetic field that movable contact 101 and the 1st conductor 107 produce is the power that is directed downwards to the function of current by repelling contact 103, if also have electric current to flow to the conductor part of fixing the rightabout repulsion contact 103 that repels contact 104 from above-mentioned center of rotation P2, then the electromagnetic force that this electric current is produced relatively rotates center P 2 and forms the moment that repulsion contact 103 is rotated to closing direction.

But, in present embodiment 126, owing to do not have electric current to pass through to the rightabout that repels contact 104 from above-mentioned center of rotation P2, so electromagnetic force relatively rotates center P 2 and all forms the moment that above-mentioned repulsion contact 103 is rotated to the disconnection direction.As a result, the velocity of rotation of repulsion contact 103 further increases.

Figure 33 2 and Figure 33 3 are end views of electrode of two different distortion examples of embodiment 126.

In the variation shown in Figure 33 2, make the 2nd conductor 108 being connected with the 1st conductor 107 and repulsion contact 103, carry out position at the center of rotation P2 of above-mentioned repulsion contact 103, in the variation shown in Figure 33 3, the 2nd conductor 108 is walked around the above-mentioned center of rotation P2 that repels contact 103 in opposite direction one side of movable contact, and the 2nd conductor 108 is being connected with above-mentioned repulsion contact 103 near a side of above-mentioned repulsion contact 104 than center of rotation P2.No matter which kind of situation can both obtain the effect identical with the situation of the foregoing description 126.

Embodiment 127:

Figure 33 4(a) be the end view that the circuit-breaker of embodiment 127 is in the electrode of closure state, Figure 33 4(b) be along Figure 33 4(a) the profile of A-A line.At Figure 33 4(b) in, omitted Figure 33 4(a) movable contact.

In present embodiment 127, as Figure 33 4(a) shown in, the center of rotation P2 that repels contact 103 is located between the 2nd conductor 108 and the repulsion contact 104.In addition, as Figure 33 4(b) shown in, utilize the pliability conductor 108a of the 2nd conductor 108 and 108b that the conductor 107a and the 107b of slit 170 both sides of the 1st conductor 107 are linked into an integrated entity with repelling contact 103.

Adopt such structure, at closure state during by big electric current such as short circuit current, as Figure 33 4(b) shown in, the branch that is parallel-laid into of pliability conductor 108a by the 2nd conductor 108 both sides and the electric current of 108b attracts mutually, because the pliability of above-mentioned pliability conductor 108a and 108b and to repelling the F that makes a concerted effort that contact 103 action directions make progress.Should make a concerted effort the application point of F on above-mentioned repulsion contact 103 in position that the above-mentioned pliability conductor 108a of the 2nd conductor 108 and 108b are connected with repulsion contact 103, promptly, be arranged in the left side that figure repels the center of rotation P2 of contact 103, so the above-mentioned F of making a concerted effort forms and makes above-mentioned repulsion contact 103 to disconnecting the moment that direction is rotated.Therefore,, the electromagnetic force that acts on the 2nd conductor 108 can be transformed to the rotatory force that repulsion contact 103 is rotated to the disconnection direction, repel contact 103 velocities of rotation thereby can improve according to present embodiment 127.

Embodiment 128:

Figure 33 5 is end views of electrode of the circuit-breaker of embodiment 128, and Figure 33 6 is profiles of Figure 33 5.Among the figure, the plane at the track place when Pa is movable contact 101 and repulsion contact 103 switches, N is the centre of surface that repels contact 104, Pb is with the Surface Vertical of repelling contact 104 and by the above-mentioned central point N plane vertical with above-mentioned plane P a, if the section center by the conductor 103a of the above-mentioned repulsion contact 103 of plane P b decision is A, the plane vertical with 107b by this center and the conductor 107a of the plane P a both sides of the 1st conductor 107 is Pc.In addition, the center by each section of the above-mentioned conductor 107a of above-mentioned plane P c decision and 107b is respectively B shown in Figure 33 6 and C.

In present embodiment 128, shown in Figure 33 6, triangle ABC is to be the equilateral triangle on base with BC, and the angle of establishing AB and BC is θ, then θ=45 ° ± 10 °.Adopt such structure also can obtain the effect identical, also have following advantage simultaneously with the foregoing description 119.

In present embodiment 128, establishing the electric current that flows into from joint 5 is I, and two side conductor 107a of the 1st conductor 107 and 107b are equal to the electric current by I/2, and then, the electric current I is by repelling contact 103.Can think center B, the C and the A that pass through conductor 107a and 107b respectively that these electric currents are approximate.If the mid point of the base BC of the equilateral triangle ABC shown in Figure 33 6 is initial point O, getting the OC direction is X-axis, and the OA direction is a Y-axis, and establishing the electric current of ordering by B, C is outside from the lining on paper, and then these electric currents are directions X in the magnetic field of closing that the A point produces.Because the electric current of order by above-mentioned A is on paper for outside in, so this closes the electromagnetic force of the electric current generation Y direction of being ordered in magnetic field by A.Therefore, as previously mentioned, repel contact 103 and be subjected to electric current by the 1st conductor 107 to the rotatory force that disconnects directive effect.If this closes magnetic field is B, then

Bx＝KμoⅠsin2θ/（4πL）

Wherein, K is a proportionality coefficient, and μ o is a permeability of vacuum, and π is a circumference ratio, and L is the distance between center B and the C.Obviously, ° locate in θ=45, Bx has maximum.If this maximum is Bmax, then in the scope of θ=45 ° ± 10 °,

Bx≥0.94Bmax

Therefore, when closure state, two side conductor 107a and making of 107b generation with respect to the 1st conductor 107 are repelled the maximum of contact 103 to the magnetic field that disconnects the direction rotation, in the electrode structure of present embodiment 128, at least can make the action of a magnetic field more than 0.94 in repelling contact 103, thus the velocity of rotation of the repulsion contact 103 at initial stage can improve short circuit current and disconnect the time.

Embodiment 129:

Figure 33 7(a) be the end view of electrode of the circuit-breaker of embodiment 129, Figure 33 7(b) be Figure 33 7(a) profile.In these figure, movable contact 101 and insulant 118 have been omitted.

In present embodiment 129, the same with the situation of the foregoing description 128, when repulsion contact 103 is in closure state, if the center of the conductor 103a of two side conductor 107a of the 1st conductor 107 and 107b and repulsion contact 103 is respectively B, C, A, as Figure 33 7(b) shown in, the base angle B of triangle ABC and angle θ=θ ' of C are less than 45 °.

Figure 33 8(a) be Figure 33 7(a) repulsion contact 103 be in the end view of the electrode of off-state, Figure 33 8(b) be Figure 33 8(a) and profile.

When the maximum off-state of above-mentioned repulsion contact 103, as Figure 33 8(a) shown in, center A established, the plane vertical with two side conductor 107a of the 1st conductor 107 and 107b is Pc ' by the conductor 103a of this repulsion contact 103.In addition, as Figure 33 8(b) shown in, the center of establishing the section of two side conductor 107a of the 1st conductor 107 and 107b is respectively B ' and C ', and then base angle θ=θ of triangle AB ' C ' is " greater than 45 °.Adopt such structure, also can obtain the effect identical with the foregoing description 119.In addition, also has following advantage.

As described in the foregoing description 128, the maximum value of magnetic field to repelling contact 103 effects that two side conductor 107a by the 1st conductor 107 and the electric current of 107b produce is ° to locate in θ=45.

Therefore, use the electrode structure of present embodiment 129, rotate to disconnecting direction along with repelling contact 103, what the 1st conductor 107 produced increases to the electromagnetic force that disconnects directive effect repelling contact 103.As a result, can compensate the part that repulsion contact 103 is reduced along with the rotation of repelling contact 103 to the electromagnetic force that disconnects the direction rotation that movable contact 101 produces, thereby the velocity of rotation that can avoid repelling contact 103 reduces.

In addition, turn to when making θ greater than 45 ° when repelling contact 103, the 1st conductor 107 produces makes and repels contact 103 and reduce to disconnecting the electromagnetic force that direction rotates, so the velocity of rotation of repelling contact 103 also reduces thereupon.When repelling contact 103 and reach maximum off-state, be braked device 112 and stop and rotating, because the velocity of rotation of above-mentioned repulsion contact 103 reduces, can alleviate the impulsive force of 103 pairs of brakes 112 of this repulsion contact.Therefore, can prevent the damage of above-mentioned brake 112 and the knock-on of repulsion contact 103.

Figure 33 9 and Figure 34 0 are the end views of electrode of two different distortion examples of the circuit-breaker of the embodiment of the invention.

In the foregoing description 119～129, the 1st conductor 107 is horizontal basically, still, also can be shown in Figure 33 9 and Figure 34 0 like that, will 107 formation of above-mentioned the 1st conductor skewed.

Figure 34 1 is the plane graph of electrode of other variation of circuit-breaker of the embodiment of the invention, and Figure 34 2 is end views of Figure 34 1, and Figure 34 3 is bottom views of Figure 34 2.

In this variation, not only on the upper surface of above-mentioned the 1st conductor 107 (the relative face of movable contact 101 during disconnection), and be also to cover on the lower surface of above-mentioned the 1st conductor 107 at its reverse side with insulant 118e.

Figure 34 4 and Figure 34 5 are end views of electrode of other different distortion example of the circuit-breaker of the embodiment of the invention.In these variation, the insulant 118c of inner face that covers the slit 170 of the 1st conductor 107 is extended upward, the area that contacts with electric arc A when movable contact 101 disconnects is further increased.

Figure 34 6(a) be the plane graph of electrode of another variation of the circuit-breaker of the embodiment of the invention, Figure 34 6(b) be along Figure 34 6(a) the profile of B-B line.

In this variation, in the insulant 118b and 118c of the inner surface of the slit 170 that covers the 1st conductor 107, the thickness of insulant 118c of close joint 5 one side inner faces that makes the easiest above-mentioned slit 170 of covering that is subjected to arc damage is greater than other insulant 118b.

Figure 34 7 is end views of electrode of another variation of the circuit-breaker of the embodiment of the invention, and Figure 34 8 is plane graphs of Figure 34 7, has omitted movable contact among the figure.

In the foregoing description 119～127 and 129,130, the 2nd conductor 108 that connects the 1st conductor 107 and repulsion contact 103 is made of two pliability conductor 108a and 108b.But in this variation, the pliability conductor of the 2nd conductor 108 usefulness that connects above-mentioned the 1st conductor 107 and repulsion contact 103 constitutes.Promptly, in this variation, on the 1st conductor 107, form shown in Figure 34 8 and the opening 170 of window-like ', the narrow paulin 170 that is the U font that replaces the 1st conductor 107 in the foregoing description uses the 2nd conductor 108 that is made of a pliability conductor with the end of joint 5 reciprocal the 1st conductors 107 with repel contact 103 and link into an integrated entity.

Figure 34 9 is end views of electrode of other variation of circuit-breaker of the embodiment of the invention, and Figure 35 0 has omitted the movable contact among Figure 34 9 and the front elevation of insulant.

In this variation, have on the 1st conductor 107 of slit 170, end at joint 5 reciprocal two side conductor 107a and 107b integrally forms sagging conductor 107c, simultaneously, with horizontal conductor 107d the lower end of two vertical conductor 107c is linked into an integrated entity, and use the 2nd conductor 108 that constitutes by a pliability conductor that this horizontal conductor 107d and above-mentioned repulsion contact 103 are linked into an integrated entity.

Figure 35 1 is the end view of electrode of other variation of the circuit-breaker of the embodiment of the invention, and Figure 35 2 is the front elevations that omitted the insulant among Figure 35 1.

In this variation, have on the 1st conductor 107 of slit 170, link into an integrated entity in the end of joint 5 reciprocal two side conductor 107a and 107b and each lower end of sagging the 2nd conductor 108, integrally be provided with the support 120 that repels contact 103 from sandwich, the rotary middle spindle P2 of above-mentioned repulsion contact 103 is bearing on this support 120.

Embodiment 130:

Figure 35 3 is that the circuit-breaker of the embodiment of the invention 130 is repelling the end view that contact is in the electrode of closure state, and Figure 35 4 is end views that the repulsion contact of Figure 35 3 becomes the electrode of off-state.

Among the figure, the 112nd, the convex brake, this brake 112 has basically the upper surface parallel with the repulsion contact 103 that roughly keeps flat-hand position, the 121st, the guide rod that fuses with the lower surface of above-mentioned repulsion contact 103,122 are provided in a side of the guide hole on the above-mentioned brake 112, and above-mentioned guide rod 121 can embed in this guide hole 122 on free sliding ground.109a and 109b are mounted in the spring that presses between above-mentioned repulsion contact 103 and the above-mentioned brake 112, and these two press spring 109a and 109b pushes above-mentioned repulsion contact 103 to closing direction.

The difference of present embodiment 130 and the foregoing description be with the foregoing description 119～121 and 129,130 in repel contact 103 switch motion be that fulcrum rotates on the contrary with center of rotation P2, in present embodiment 130, above-mentioned repulsion contact 103 carries out switch motion with the lifting of vertical direction, so also can obtain the effect identical with the situation of the foregoing description.

Figure 35 5 is oblique views of electrode of other variation of circuit-breaker of the embodiment of the invention.In this variation, 107 of the 1st conductors have monolateral conductor 107a, at this moment also can obtain same effect.

In addition, the situation of circuit-breaker has been described in the foregoing description 119～130, but also go for other switch, can have obtained the effect identical equally with the foregoing description 119～130.

As mentioned above, according to the 1st aspect of the present invention, after just separated the contact, all current paths of fixed contact all produced the electromagnetic force that electric arc is stretched to joint one layback, and arc voltage is risen sharp, in addition, even the break distance of movable contact increases, because the insulant of slit to the cooling effect of electric arc high arc voltage can take place and keep, so, can obtain to have the switch of excellent current limiting performance.

According to the 2nd aspect of the present invention, make the 2nd conductor have the parallel part of movable contact of when closure state, making peace greatly to the rightabout position of joint from the position of fixed contact, so, electromagnetic force rises the opening speed of movable contact rapidly, thereby has the effect of further raising current limiting performance.

According to the 3rd aspect of the present invention, form the shape that slightly is the U font by making fixed contact, the shaping processing of this fixed contact is rather easy.In addition, on the said fixing contact, be provided with the slit of the switch motion of allowing movable contact on the conductor that is positioned at above the stationary plane of fixed contact, like this, the said fixing contact just can not hinder the switch motion of above-mentioned movable contact.

According to the 4th aspect of the present invention, the 1st conductor only is configured in the left side or the right of the trajectory plane that the switch motion of movable contact describes, like this, just can obtain the switch of the good and pressure damage that take place in the container when being difficult to of current limiting performance by big failure of current.

According to the 5th aspect of the present invention, but the width of moving-conductor left and right directions that makes a part that constitutes movable contact is less than the width of moving contact, can prevent that moving contact from coming off, simultaneously, also have the mechanical strength that increases the movable contact above-below direction, the effect that prevents the movable contact distortion.

According to the 6th aspect of the present invention, movable contact is subjected to all electric currents by fixed contact to the forceful electric power magnetic force that disconnects directive effect, disconnects rapidly, contact spacing is from increase, simultaneously, after just separated the contact, all electric currents of the conductor by constituting the said fixing contact all stretched electric arc to the joint direction, arc length increases, arc voltage rises sharp, and then, electric arc also is extruded on the insulant that covers the 1st conductor, so, high arc voltage can take place and keep.

According to the 7th aspect of the present invention, after just disconnecting, can maximally utilise the power of the attraction movable contact that the electric current of the 1st conductor of fixed contact produces, thereby can improve opening speed rapidly.

According to the 8th aspect of the present invention, after the contact just disconnects, all current paths of fixed contact all produce the electromagnetic force that electric arc is stretched to joint one layback, arc voltage sharp can raise, in addition, usually, the electromagnetic force that produces of the electric current by fixed contact is to the part of the movable contact power to the rotation direction effect.Even the break distance of movable contact increases, owing to cover insulant on the 1st conductor of fixed contact to the cooling effect of electric arc, also high arc voltage can take place and keep, so, can obtain to have the switch of excellent current limiting performance.

According to the 9th aspect of the present invention, fixed contact forms the shape that slightly is the U font, after just separate the contact, all current paths of fixed contact all produce the electromagnetic force that electric arc is stretched to joint one layback, can improve arc voltage sharp, even the break distance of movable contact increases, because the insulant of the 1st conductor of covering fixed contact is to the cooling effect of electric arc, also high arc voltage can take place and keep, and, can not influence the electromagnetic force that electric arc is stretched to the joint direction that fixed contact produces, so, can be fixed the switch that insulation breakdown can not take place contact with excellent current limiting performance.

According to the 10th aspect of the present invention, the electric arc that takes place between the contact is clipped in the middle by the arc extinguishing side plate of both sides, utilize these two blocks of arc extinguishing side plates to stop the interpleural above-mentioned electric arc of this arc extinguishing to horizontal expansion, thereby can be to the very strong electric arc driving magnetic field of arcing after the firm disconnection, bring into play the effect of arc extinguishing side plate greatly, under off-state, can forcibly electric arc be expressed on the insulant and cool off, so, can obtain the switch that current limliting is cut off excellent performance.

According to the 11st aspect of the present invention, can apply powerful electric arc driving magnetic field to the electric arc after the firm disconnection, bring into play the effect of arc extinguishing side plate greatly, under off-state, can forcibly electric arc be expressed on the insulant and cool off, in addition, because the pressure of side space rises under the 1st conductor, electric arc is upwards blowed, electric arc can be elongated, the opening speed of movable contact is increased, so, can obtain the switch that current limliting is cut off excellent performance.

According to the 12nd aspect of the present invention, after just separate the contact, because all current paths of fixed contact all produce the electromagnetic force that electric arc is stretched to joint one layback, electric arc after movable contact just can having been disconnected elongates, simultaneously, with cooled off again after the arc extinguishing board of the 1st conductor below that is configured in fixed contact contacts, so, can improve arc voltage sharp.In addition, even the break distance of movable contact increases, because high arc voltage also can take place and keep to the cooling effect of electric arc in insulant, so, can obtain having the switch of excellent current limiting performance.

According to the 13rd aspect of the present invention, all electric currents by fixed contact after just having disconnected all produce electromagnetic force to the power-supply system directive effect to the following side space of the 1st conductor of fixed contact, electric arc consumingly stretches, can apply powerful driving magnetic field to the electric arc after the firm disconnection, so, arc voltage rises rapidly, in addition, can utilize magnetic pole to absorb electric current by the said fixing contact, thereby can obtain the switch that current limliting is cut off excellent performance in the opposing magnetic field that the superjacent air space of above-mentioned the 1st conductor produces.

According to the 14th aspect of the present invention; an arc extinguishing board in the arc extinguishing board is contacted with the top that covers the 1st conductor and one of them side's maintenance face of insulant of bottom; electric arc contacts the back generation with the insulant that covers the 1st conductor gas can prevent switch pressure inside abnormal ascending; simultaneously; by the protection insulant; can also prevent insulation breakdown, high arc voltage can take place and keep, thereby can obtain having excellent current limiting performance, safe switch.In addition, can also increase the quantity of arc extinguishing board effectively, improve cooling effect, electric arc is promptly extinguished electric arc.

According to the 15th aspect of the present invention, on the 2nd conductor, be provided with the electric arc guide plate, electric arc spot in the time of can rapidly the contact just having been separated on the contact moves on the electric arc guide plate, alleviates the damage of electric arc to fixed contact, thereby can obtain having the high switch of durability of excellent current limiting performance.

According to the 16th aspect of the present invention, be provided with the 1st conductor and keep the electric arc guide plate of electric contact, can with the arc transfer that disconnects the action later stage to the electric arc guide plate, electric arc contact with arc extinguishing board, thereby can obtain the switch of current limiting performance and cut-out excellent performance.In addition, electric arc is moved on on the electric arc guide plate, can protect insulant, suppress to disconnect action later stage internal pressure and rise, thereby can prevent that container from damaging.

According to the 17th aspect of the present invention, on the insulant that covers the 1st conductor, be provided with electrode with the fixed contact insulation, when the moving contact face turns to the 1st conductor top, can utilize electrode cooling electric arc, simultaneously, the electric arc spot of fixed contact one side can be maintained at last, arc length is increased, so, current limiting performance and the switch that cuts off excellent performance can be obtained.In addition, electric arc is directed on the electrode, can suppress to disconnect the internal pressure in action later stage and rise, thereby can prevent that container from damaging.

According to the 18th aspect of the present invention, the conductor that the repulsion contact is connected with power-supply system one side is made of the 1st conductor and the 2nd conductor, when above-mentioned repulsion contact and the movable contact relative with it disconnect the 1st conductor they moving contact and repel between the contact, be connected with power-supply system one side; The 2nd conductor links together the 1st conductor and above-mentioned repulsion contact at the reciprocal end in above-mentioned repulsion contact.Electric current by movable contact and repulsion contact when short circuit current cuts off produces electromagnetic repulsive force mutually, this electromagnetic repulsive force not only, if apply greater than the power of specifying size to disconnecting direction, then also the above-mentioned repulsion contact that disconnects action is produced the electromagnetic repulsive force that above-mentioned repulsion contact is disconnected by the electric current that will repel the 1st conductor that the contact power-supply system connects, so, opening speed is very fast, thereby can obtain excellent current limiting performance.

According to the 19th aspect of the present invention, make above-mentioned the 1st conductor when above-mentioned movable contact and above-mentioned repulsion contact closure, be positioned at their moving contact and repel the contact the surface above, so, when little failure of current, also can obtain making the high-intensity magnetic field of the electric arc elongation on the above-mentioned repulsion contact, thereby can obtain having the excellent current limiting performance and the switch of little current shut-off performance.

Claims (19)

1, a kind of switch, have movable contact that an end is provided with moving contact and an end be provided with under the switch motion of movable contact can and above-mentioned moving contact contact fixed contact with the fixed contact of separating, and the joint that is connected with the other end of this fixed contact, it is characterized in that: the said fixing contact is made of the 1st conductor, the 2nd conductor and the 3rd conductor, and the 1st conductor is connected with above-mentioned joint; The 2nd conductor is provided with the said fixing contact; The 3rd conductor is connected above-mentioned the 1st conductor along the vertical direction with the 2nd conductor, when if the direction that the above-mentioned moving contact of contact closure condition leaves from the said fixing contact is the top, above-mentioned the 3rd conductor is arranged on the other end of not establishing moving contact than the position of said fixing contact near movable contact, and be positioned at the rightabout position of above-mentioned joint, the top of this contact contact-making surface when above-mentioned the 1st conductor is arranged on the above-mentioned closing of contact, simultaneously, when above-mentioned contact disconnects, be positioned at above-mentioned moving contact contact-making surface below, and the position of above-mentioned the 1st conductor of seeing from above-mentioned moving contact surface when with insulant above-mentioned contact being disconnected covers.

2, by the described switch of claim 1, it is characterized in that: the said fixing contact is in the bonding conductor that connects above-mentioned joint and said fixing contact, in part near the said fixing contact, from the position of said fixing contact to the opposite direction of above-mentioned joint, the parallel part of above-mentioned movable contact when having basically with closure.

3, by the described switch of claim 1, it is characterized in that: the said fixing contact has the bonding conductor that formation roughly is the U word shape, the said fixing contact is fixed on an end inboard of this U word shape, and, above-mentioned joint is connected with the other end of above-mentioned U word shape, is provided with the slit of the switch motion of allowing the relative said fixing contact of above-mentioned movable contact on the bonding conductor above the stationary plane that is positioned at the said fixing contact.

4, by the described switch of claim 1, it is characterized in that: the left side or the right of the trajectory plane that the said fixing contact is described in the switch motion of above-mentioned movable contact form above-mentioned the 1st conductor that is positioned at top, said fixing contact.

5, by the described switch of claim 1, it is characterized in that: when the vertical direction in plane of establishing the track place of describing with the switch motion of above-mentioned movable contact is left and right directions, but the width of moving-conductor left and right directions that makes a part that constitutes above-mentioned movable contact is less than the width of above-mentioned moving contact.

6, by the described switch of claim 1, it is characterized in that: above the end conduction center, road that is provided with above-mentioned moving contact of above-mentioned the 1st conductor arrangement above-mentioned movable contact when the above-mentioned contact closure condition, simultaneously, when the off-state of above-mentioned contact, be positioned at the below of the contact-making surface of above-mentioned moving contact, and the position of above-mentioned the 1st conductor of seeing from above-mentioned moving contact surface during with above-mentioned contact off-state with insulant covers.

7, by the described switch of claim 6, it is characterized in that: the said fixing contact has the 1st conductor that otch is set along the plane at the track place that above-mentioned movable contact is described, under contact closure condition, in the section vertical and vertical with the otch of above-mentioned the 1st conductor with the plane at above-mentioned track place, connecting above-mentioned the otch each side center P 1 of conductor section and the straight line of P2, is 45 ° ± 10 ° with angle theta 1 in plane, above-mentioned track place that each straight line became and the θ 2 of the center P 3 of the movable contact conductor section of a part that connects and composes above-mentioned movable contact and above-mentioned center P 1 and P2.

8, by the described switch of claim 1, it is characterized in that: above-mentioned the 1st conductor always is positioned at the top of the part of above-mentioned movable contact to the contact off-state from contact closure condition.

9, by the described switch of claim 1, it is characterized in that: the formation of said fixing contact slightly is the U word shape, the fixed contact that is fixed on an end of this fixed contact contacts with above-mentioned moving contact, the surface of separating is in the face of the other end of said fixing contact, be provided with in order not hinder above-mentioned moving contact to contact at the said fixing contact with above-mentioned fixed contact, the slit of the switch motion of above-mentioned movable contact during separation, at the other end of said fixing contact one end of above-mentioned slit is arranged, the other end of this slit is than the position of the fixed contact of the more close said fixing contact in U font bottom of said fixing contact.

10, by the described switch of claim 1, it is characterized in that: the both sides on the plane, track place of moving contact when the arc extinguishing side plate is configured in above-mentioned movable contact switch motion are arranged between above-mentioned plane and the part corresponding with the plane of above-mentioned the 1st conductor at least one in the arc extinguishing side plate.

11, by the described switch of claim 10, it is characterized in that: above-mentioned arc extinguishing side plate is provided with to such an extent that make the top of this arc extinguishing side plate be no more than the altitude range of above-mentioned the 1st conductor.

12, by the described switch of claim 1, it is characterized in that: the position of the contact-making surface of the said fixing contact that contacts with above-mentioned moving contact is positioned at below the position of above-mentioned joint, the 3rd conductor arrangement than the other end of not establishing moving contact of the more close movable contact in position of said fixing contact and be positioned at the opposite direction position of above-mentioned joint, is arranged on arc extinguishing board the below of above-mentioned the 1st conductor.

13, by the described switch of claim 1, it is characterized in that: above above-mentioned the 1st conductor, magnetic sheet parallel with the 1st conductor basically more than is set, on this magnetic sheet, is provided with the otch space of the switch motion of allowing above-mentioned movable contact.

14, by the described switch of claim 1, it is characterized in that: cover at least one side of insulant of upper and lower of above-mentioned the 1st conductor and a maintenance face at above-mentioned arc extinguishing board center and contact.

15, by the described switch of claim 1, it is characterized in that: make the position of the contact-making surface of the said fixing contact that contacts with above-mentioned moving contact be positioned at the below of above-mentioned joint location, the 3rd conductor arrangement than the other end of not establishing moving contact of the more close movable contact in position of said fixing contact and be positioned at the reciprocal position of above-mentioned joint, is provided with the electric arc guide plate fixing on the 2nd conductor of said fixing contact.

16, by the described switch of claim 1, it is characterized in that: make the position of the contact-making surface of the said fixing contact that contacts with above-mentioned moving contact be positioned at the below of above-mentioned joint location, the 3rd conductor arrangement than the other end of not establishing moving contact of the more close movable contact in position of said fixing contact and be positioned at the reciprocal position of above-mentioned joint, is provided with simultaneously with above-mentioned the 1st conductor and keeps the electric electric arc guide plate that contacts.

17, by the described switch of claim 1, it is characterized in that: make the position of the contact-making surface of the said fixing contact that contacts with above-mentioned moving contact be positioned at the below of above-mentioned joint location, the 3rd conductor arrangement than the other end of not establishing moving contact of the more close movable contact in position of said fixing contact and be positioned at the reciprocal position of above-mentioned joint, is provided with the electrode with the insulation of said fixing contact on the insulant that covers above-mentioned the 1st conductor.

18, a kind of switch, it is characterized in that: have movable contact and repel contact, one end of movable contact is provided with moving contact, it is substantially parallel to repel contact and above-mentioned movable contact, the one head be provided with can with the contact of above-mentioned moving contact, the repulsion contact of separating, in this switch, has the conductor that above-mentioned repulsion contact is connected with power-supply system one side, this conductor is made of the 1st conductor and the 2nd conductor, the 1st conductor is when the off-state of above-mentioned movable contact and above-mentioned repulsion contact, between above-mentioned moving contact and repulsion contact, be connected with power-supply system one side; The 2nd conductor couples together the 1st conductor and above-mentioned repulsion contact in the reciprocal end of above-mentioned repulsion contact.

19, by the described switch of claim 18, it is characterized in that: above-mentioned the 1st conductor is positioned at the surface of above-mentioned moving contact and repulsion contact when the closure state of above-mentioned movable contact and above-mentioned repulsion contact.

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