JP2918752B2 - Switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch, such as a circuit breaker, a current limiter, or an electromagnetic contactor, which generates an arc in a container when current is interrupted.

[0002]

2. Description of the Related Art FIG. 39 is a side view showing a conventional switch, for example, when a circuit breaker is opened, FIG. 40 is a side view showing a state immediately after the contact of the circuit breaker shown in FIG. 39 is opened, and FIG. FIG. 41 is a side view showing the maximum open state of the movable contact in the circuit breaker of FIG. 40. In the drawings, reference numeral 1 denotes a movable contact of a circuit breaker, and the movable contact 1 is supported so as to rotate around a rotation fulcrum (center of rotation) 14 (see FIGS. 40 and 41) of a base. Have been. 2 is the movable contact 1
Are fixed contacts which are fixed to one end (lower surface of the free end), and 3 is a fixed contact which comes into contact with / separates from the movable contact 2 by the rotation of the movable contact 1, and 4 is a fixed contact having the fixed contact 3 at one end. The configuration of the fixed contact 4 will be described later. Reference numeral 5 denotes a power-supply-side terminal connected to the other end of the fixed contact 4. Reference numeral 6 denotes an arc extinguishing plate which functions to extend and cool an arc generated between the movable contact 2 and the fixed contact 3 when the movable contact 2 and the fixed contact 3 are opened. 7 is the arc extinguishing plate 6
This is the arc-extinguishing side plate that holds. Reference numeral 8 denotes a mechanism for rotating the movable contact 1, and this mechanism 8 has a built-in current detection unit (not shown), and the current detection unit operates by detecting a short-circuit current. Has become. 9 is a handle for manually operating the mechanism section 8, 10 is a load side terminal section, and 11 is the terminal section 10 of the movable contact 1
Is a conductor connected to Reference numeral 12 denotes a container for accommodating these circuit breaker components, and reference numeral 13 denotes an exhaust hole provided in a wall of the container 12.

Here, the configuration of the fixed contact 4 will be described. 39 to 41, the fixed contact 4 includes a conductor 4a connected to the terminal 5 on the power supply side and extending in the horizontal direction, and the terminal 5 in the conductor 4a.
A vertical conductor portion 4b bent downward at the end opposite to the end portion, and a stepped lower conductor portion 4c extending horizontally from the lower end of the conductor portion 4b and opposite to the conductor portion 4a.
A conductor 4d that rises vertically from the tip of the conductor 4c, and the conductor 4a from the upper end of the conductor 4d.
And a conductor portion 4e extending horizontally in the horizontal direction. The fixed contact 3 is provided on the conductor portion 4e.

[0004] In the fixed contact 4 having such a configuration, the conductor 4 d connecting the conductor 4 c at the step-like lower portion and the fixed contact 3 side moves the movable contact 1 from the position of the fixed contact 3. A conductor portion 4e having a fixed contact 3 located on the other end side where the contact 2 is not fixed and opposite to the terminal portion 5;
Is located on the same horizontal plane as the conductor portion 4a having the terminal portion 5, and is located below the position of the contact contact surface when the movable contact 2 and the fixed contact 3 are closed. The fixed contact 4 is used in a bare skin exposed state where the entire surface is not insulated.

Next, the operation will be described. In the state of FIG. 39, the terminal 5 of the fixed contact 4 is connected to a power source, and the terminal 10 on the load side is connected to a load. In this state, when the handle 9 is operated in the direction of arrow B, the mechanism section 8 is operated, and the movable contact 1 is rotated downward about the rotation fulcrum 14 (see FIGS. 40 and 41) of the base. When the movable contact 2 comes into contact with the fixed contact 3 in a closed state, power is supplied from the power supply to the load. In this state, the movable contact 2 is pressed against the fixed contact 3 with a predetermined contact pressure in order to ensure the reliability of energization.

Here, when a short-circuit accident or the like occurs in the circuit on the load side of the circuit breaker and a large short-circuit current flows in the circuit, the large current is detected by the current detecting section in the mechanical section 8 and the mechanical section is detected. Activate 8 Thereby, the movable contact 2 is separated from the fixed contact 3 by rotating the movable contact 1 in the contact separating direction. At the time of such contact opening, FIG.
0 and the movable contact 2 and the fixed contact 3 as shown in FIG.
And arc A is generated.

However, normally, when a large current such as a short-circuit current flows, the electromagnetic repulsion at the contact surface between the movable contact 2 and the fixed contact 3 becomes very strong, and overcomes the contact pressure applied to the movable contact 2. In addition, the movable contact 1 is
Rotate in the contact opening direction without waiting for the above operation. Accordingly, the rotation causes the movable contact 2 and the fixed contact 3 to be separated from each other, and the arc A generated between the contacts 2 and 3 is extended by the arc-extinguishing plate 6 and cooled. As a result, the arc resistance increases, and a current limit occurs in which the short-circuit current is reduced.
At the current zero point, the arc A is extinguished and the current interruption is completed.

[0008] Current limiting is very important for improving the protection function of a circuit breaker, and in order to improve current limiting performance, it is necessary to increase the arc resistance as described above.

[0009] As a method of elongating the arc to increase the arc resistance, for example, Japanese Unexamined Patent Publication No.
This method uses a fixed contact having a shape as disclosed in Japanese Patent Application Laid-Open No. 0-49533 and Japanese Patent Application Laid-Open No. 2-68831. The shape of the fixed contact shown in these publications is basically the same as the shape of the fixed contact 4 shown in FIGS. The current path of the fixed contact 4 is shown in FIG.
9 to 41, the terminal portion 5 on the power supply side and the conductor portion 4
a, 4b, 4c, 4d, and 4e, to reach the fixed contact 3 in this order.

In such a current path, the electromagnetic force exerted on the arc A by the current flowing through the current path 4e of the fixed contact 4 on the fixed contact 3 side is a force for extending the arc A toward the arc extinguishing plate 6. This force causes arc A to stretch longer and increase the arc voltage. Further, the arc A increases the arc voltage also by the cooling action of the arc extinguishing plate 6, so that the current limiting performance is improved. Further, the current flowing through the movable contact 1 when the contacts are closed is in the opposite direction to the current flowing through the current path 4e of the fixed contact 4, and when the large current is interrupted, the movable contact 1 and the fixed contact 4
Current repulsion acts between the current paths 4e.

As a result, the opening speed of the movable contact 1 can be increased, and the arc A between the contacts can be quickly increased.
The arc voltage also increases quickly. As a result, the arc resistance is higher, and a circuit breaker having excellent current limiting performance can be obtained.

In order to enhance the current limiting performance in ordinary AC interruption, it is necessary to increase the arc resistance as described above. In this case, however, the current immediately after the contacts 2 and 3 are opened still has a maximum value. Before it can, the arc resistance must be increased. Even if the arc resistance is increased after the current increases, the current is not easily limited due to the inertia effect of the current. On the contrary, since the current is large and the resistance is high, the arc energy generated in the circuit breaker becomes large, and the damage to the circuit breaker only becomes severe. Therefore, it is necessary to have a fixed contact shape that greatly extends the arc immediately after the contacts 2 and 3 are separated by a strong electromagnetic force and sharply increases the arc resistance.

[0013]

Since a conventional switch having a fixed contact shape is constructed as described above, FIG.
As shown in FIG. 1, the current path of the fixed contact 4 that generates an electromagnetic force for extending the arc A immediately after the contacts 2 and 3 are opened in the direction of the terminal 5 on the power supply side is a conductor section having the terminal 5 on the power supply side. 4a, only the conductor portion 4e on the fixed contact 3 side separated on the same surface as the other current paths (conductor portions) 4a, 4b, 4c,
4d generates an electromagnetic force for extending the arc A all the way to the side opposite to the terminal portion 5. This is because the current flowing through the conductors 4a and 4c flows in the direction opposite to the direction of the conductor 4e on the fixed contact 3 side, so that an electromagnetic force is generated to extend the arc A in the direction opposite to the direction of the terminal 5. The current of the conductor 4b repels the current of the arc A because of the opposite direction, and the conductor 4b
Since the current d draws in the same direction as the current of the arc A, the arc A is elongated in the direction opposite to the direction of the terminal portion 5. For this reason, the electromagnetic force that extends the arc A generated by the current path 4e in the direction of the terminal portion 5 is canceled by the current flowing through the other current paths. Further, only the current path 4e of the fixed contact 4 exerts the electromagnetic force in the rotational direction over the entire movable contact 1, as described above, and the other current paths 4a and 4c are movable contacts. 1 flows in the same direction as that of the movable contact 1
Exerts electromagnetic force in the closing direction. The current flowing through the current path 4d exerts an electromagnetic force in the rotating direction on the rotating center 14 side of the movable contact 1, but exerts an electromagnetic force in the closing direction on the movable contact 2 side.

Therefore, in the shape of the fixed contact 4 used in the conventional switch, the electromagnetic force of the current flowing through the fixed contact 4 extends the arc A due to the high-speed opening of the movable contact 1. There is a problem that it does not work effectively. Also, only the electromagnetic force of the current path 4e of the fixed contact 4 contributing to the high-speed opening of the movable contact 1 rapidly decreases because the distance between the movable contacts 1 increases as the movable contact 1 rotates. There was a problem that the opening speed was reduced.

As described above, in the shape of the conventional fixed contact,
The electromagnetic force flowing through the fixed contact 4 cannot be effectively used to extend the arc A or to increase the opening speed of the movable contact 1, so that the required current limiting performance cannot be obtained. there were.

The first aspect of the present invention has been made to solve the above-mentioned problems, and a strong driving magnetic field is applied to an arc immediately after the opening of the electrode, so that the function of the arc-extinguishing side plate is greatly exerted. It is an object of the present invention to obtain a switch having excellent current limiting interruption performance capable of forcibly cooling an arc in an open state and improving the arc cooling effect.

According to a second aspect of the present invention, when the contact is opened,
And the surface insulation of the arc-extinguishing side plate is poor.
The dielectric strength between the fixed and movable contacts
And to obtain a switch with excellent current limiting performance .

According to a third aspect of the present invention, when the contact is opened,
And the opening speed of the movable contact
An object of the present invention is to obtain a switch which can be increased and has excellent current limiting performance .

According to a fourth aspect of the present invention, when the contact is opened,
And the force applied to the arc-extinguishing side plate is reduced.
It is possible to reduce the mechanical strength of the arc-extinguishing side plate without much need
An object of the present invention is to obtain a switch capable of maintaining excellent current limiting performance .

According to a fifth aspect of the present invention, when the contact is opened,
Cooling while maintaining excellent current limiting performance.
The purpose is to obtain a switch that can be held.

[0021]

[0022]

[0023]

[0024]

[0025]

According to a first aspect of the present invention, there is provided a switch including a movable contact having a movable contact at one end, and a fixed contact which can be separated from and separated from the movable contact by opening and closing the movable contact. A fixed contact provided in a portion, and a switch for connecting a power supply system to the fixed contact, wherein when the contact is opened and closed in a vertical direction, the first contact connects the fixed contact to the power supply system. A second portion having a conductor portion and the fixed contact;
A conductor portion and a third conductor portion connecting the first conductor portion and the second conductor portion in the vertical direction, wherein the third conductor portion is provided with a movable contact of a movable contact from a position of the fixed contact. The first conductor portion is disposed above the contact contact surface when the contact is closed, and the movable contact of the movable contact is disposed when the contact is opened. A first conductor portion that is disposed below a contact surface and that can be seen from the surface of the movable contact when the contact is opened, is covered with an insulating material, and both sides of a plane including the locus of the movable contact when the movable contact is opened and closed; The arc-extinguishing side plate is disposed at least one of these arc-extinguishing side plates is disposed between the plane corresponding to the plane of the first conductor portion.

According to a second aspect of the present invention , in the switch, the movable contact is provided.
In the open state of the above, the movable contact is located above the arc-extinguishing side plate.
It is configured to protrude in the direction .

According to a third aspect of the present invention , the switch includes the arc-extinguishing side plate.
The upper side of the arc-extinguishing side plate exceeds the height range of the first conductor.
It was formed so that it could not be obtained .

A switch according to a fourth aspect of the present invention is the switch of the arc extinguishing side plate.
The upper side does not exceed the height range of the first conductor portion, and
The lower end of the arc-extinguishing side plate is positioned above the fixed contact.
It is what was constituted .

According to a fifth aspect of the present invention , in the switch, the arc extinguishing on both sides is performed.
When the distance between the arc extinguishing side plates is set to be a width,
When the arc side plate is closer to the power supply system than the path of the movable contact,
A portion having a width smaller than the width of the portion facing the mark is provided .

[0030]

[0031]

[0032]

[0033]

[0034]

In the switch according to the first aspect of the present invention, the arc generated between the contacts is prevented from spreading in the width direction of the arc extinguishing side plate by the arc extinguishing side plates on both sides, and a portion of the first conductor portion facing the arc is protected. The spread in the direction perpendicular to the width direction in the direction opposite to the power supply system side in the direction perpendicular to the width direction is prevented by the electromagnetic force caused by all the currents flowing through the conductors constituting the fixed contact at the initial stage of opening. As a result, the arc only extends in the direction of the power supply system, so that the arc voltage sharply increases. When the movable contact is opened, a high arc voltage is generated by the hot gas of the arc erupting from the movable contact colliding with the insulated portion of the first conductor portion that can be seen from the contact surface and being forcibly cooled, Can be maintained.

The switch according to the second aspect of the present invention has a movable contact.
When the contact is opened, the movable contact projects above the arc-extinguishing side plate
Large insulation distance between the movable contact and the arc-extinguishing side plate
As a result, insulation breakdown does not occur in the latter half of the interruption.

The switch in the third aspect of the present invention, after blocking
After the half movable contact comes out above the first conductor, the arc-extinguishing side plate
Because the arc is not narrowed, the arc extinguishing side
There is no gas released from the plate, and pressure rise is suppressed.

According to a fourth aspect of the present invention, the switch is provided on the arc extinguishing side.
Since the lower end of the plate is above the fixed contacts,
The pressure generated in the space below the first conductor due to cracks can easily escape
In addition, the movable contact in the latter half of breaking is higher than the first conductor.
After exiting, the arc is not narrowed to the arc-extinguishing side plate.
No gas is released from the arc-extinguishing side plate due to
Can be suppressed.

The switch according to the fifth aspect of the present invention has a fixed connection.
Power supply system based on the width of the arc-extinguishing side plate between the point and the movable contact
The narrow width between the arc-extinguishing side plates in the direction
An arc is pushed in between and the cooling effect of the arc is improved.
You.

[0039]

[0040]

[0041]

[0042]

[0043]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG.
FIG. 2 is a side view of an arc extinguishing section showing a closed state of a circuit breaker in which a container is cross-sectioned as a switch according to an embodiment of the present invention, and FIG. 2 shows an opened state of the circuit breaker of FIG. to a side view, FIG. 3 FIG. 1 and a plan view of a fixed contact including extinguishing side plate in FIG. 2, FIG. 4 is a front view of FIG. 3, FIG. 5 is a perspective view of FIG. 3, FIGS. 39 The same or corresponding parts as in FIG. In the figure, 4
Is a fixed contact, which is composed of a first conductor 4a, a second conductor 4e, and a third conductor 4d, and has a fixed contact 3 on the second conductor 4e.

More specifically, in the contact closed state of FIG. 1, when the direction in which the movable contact 2 of the movable contact 1 is separated from the fixed contact 3 is upward, the fixed contact 4 is connected to the power supply system. A first conductor portion 4a extending in the horizontal direction to which the terminal portion 5 is connected; a second conductor portion 4e spaced below the first conductor portion 4a; a second conductor portion 4e and the first conductor portion 4a And a third conductor portion 4d vertically connected to the opposite side of the terminal portion 5 to form a fixed contact 3 fixed on the second conductor portion 4e.
Are located below the first conductor portion 4a.

The fixed contacts 4 are fixed contacts 3
The third conductor portion 4d is located on the other end side of the movable contact 1 to which the movable contact 2 is not fixed and on the opposite side of the terminal portion 5 (on the side of the rotation fulcrum 14 of the movable contact 1). It is attached and set to the container 12 as the orientation to be performed. in this case,
The first conductor portion 4a is entirely located above the contact contact surface when the movable contact 2 contacts the fixed contact 3 when the contact is closed, and is also located above the movable contact 1 when the contact is opened. .

Here, the structure related to the movable contact 1 and the fixed contact 4 will be described in more detail. First,
The fixed contact 4 is integrally formed in a substantially U shape by a first conductor portion 4a, a second conductor portion 4e, and a third conductor portion 4d, and a power supply of the first conductor portion 4a, which is one end of the U shape. The terminal 5 on the power supply side is connected to the end on the system connection side. Also,
The fixed contact 3 is fixed to the inside of the U-shape that is the opposite end, that is, to the upper surface of the second conductor 4e. Further, in the fixed contact 4, the connection conductors (the first conductor 4a and the third conductor 4d) located above the fixed surface of the fixed contact 3 are provided with slits 40 as shown in FIGS. Is provided.

The slit 40 is formed in the second conductor 4e.
This is to prevent opening / closing operation of the movable contact 1 with respect to the upper fixed contact 3.

In the height range of the third conductor 4d of the fixed contact 4, the slit 4 of the third conductor 4d
The center of rotation 14 of the movable contact 1 is arranged at an outer position opposite to 0. This allows the movable contact 1 to rotate in the contact opening / closing direction via the slit 40.

Further, two arc-extinguishing side plates 7 on the left and right sides are arranged on both sides inside the slit 40 in the fixed contact 4. These arc-extinguishing side plates 7 are parallel to each other on both sides inside the slit 40 so as to sandwich a trajectory surface when the movable contactor 1 is opened and closed, and the first conductor 4 a
Standing above.

In the fixed contact 4 provided with the arc extinguishing side plate 7 as described above, the inner surface of the slit 40 of the first conductor portion 4a and the portion of the first conductor portion 4a located outside the arc extinguishing side plate 7 are formed. The upper surface is separated from the surface of the movable contact 2 by the arc-extinguishing side plate 7. The other portion of the first conductor portion 4a that can be seen from the surface of the movable contact 2, that is, the inner surface and the upper surface of the slit 40 in the first conductor portion 4a on the terminal portion 5 side are covered with the insulator 15. The insulator 15 covers the upper surface of the first conductor portion 4a.
And an insulator 15b that covers the inner surface of the slit 40.

In FIGS. 1 and 2, FIG.
Are omitted from the mechanism section 8 and the operation handle 9 shown in FIG.

Next, the operation will be described. When a large current such as a short-circuit current flows, the movable contact 1 rotates without waiting for the operation of the mechanism, and the movable contact 2 and the fixed contact 3 are separated from each other. What happens is the same as in the prior art. FIG. 6 is an operation explanatory view showing a state immediately after the contact is separated, and FIG. 7 is a sectional view taken along line AA of FIG. In such a state immediately after the contact is separated, the contact surface of the movable contact 2 is still below the first conductor 4a of the fixed contact 4. Here, the arrows indicate the current.

In this state, the current path formed from the terminal portion 5 to the first conductor portion 4a of the fixed contact 4 is all above the arc A. As a result, the electromagnetic force acting on the arc A generated by the current path becomes a force for extending the arc A to the terminal portion 5 side.

Since the current flowing through the third conductor portion 4d of the fixed contact 4 is in the opposite direction to the current of the arc A, the electromagnetic force due to the current flowing through the third conductor portion 4d is also reduced by the force that extends to the terminal portion 5 side. Become.

Accordingly, the electromagnetic force generated by the current flowing through the fixed contact 4 is all the force Fm for extending the arc A to the terminal portion 5, and a very strong arc driving magnetic field is obtained.

Here, as shown in FIG. 7, the arc A generated between the movable contact 2 and the fixed contact 3 is sandwiched between the left and right arc-extinguishing side plates 7. Therefore, the arc A does not spread to both sides, and the cross-sectional area in this direction is reduced. On the other hand, as shown in FIG. 6, since a strong electromagnetic force Fm acts on the arc A in the direction of the terminal 5, the arc A between the movable contact 2 and the fixed contact 3 flows in the opposite direction to the terminal 5. It does not spread.

That is, the effect of narrowing the cross-sectional area of the arc A by the arc extinguishing side plate 7 is effectively performed by the electromagnetic wall. In addition, since the heat is removed from the portion touching the arc extinguishing side plate 7, the arc A is cooled. Further, since the arc A is sandwiched from both sides by the arc-extinguishing side plate 7 as described above, the pressure in the arc generating region rises, and the movable contact 2 is forcibly pushed up by this pressure.
The opening speed of the movable contact 1 increases.

As a result, arc A immediately after the contact was opened
Is strongly stretched, the cross-sectional area is reduced and cooled, and the distance between the contacts 2 and 3 increases rapidly, so that the arc voltage sharply increases.

FIG. 8 is a side view showing a state in which the movable contact in FIG. 6 is maximally separated. It is known that in a high-current arc such as a short-circuit current, a metal vapor stream in which contacts evaporate in a direction perpendicular to the contact surface is ejected from the foot of the arc on the contact surface, and this vapor stream is a main component of the arc A. ing.

As shown in FIG. 8, since the first conductor 4a facing the surface of the movable contact 2 is insulated by the insulator 15, the metal vapor ejected from the surface of the movable contact 2 is And the arc voltage rises.

An electromagnetic force Fm due to a strong arc driving magnetic field acts on the arc A below the first conductor portion 4a of the fixed contact 4 so that the slit 4
The arc driving magnetic field also exists in the 0 part as follows.

FIG. 9 is a sectional view taken along the line BB of FIG. 8, and the arc extinguishing side plate 7 is omitted. In the figure, reference numeral 41 denotes the center of gravity of each cross section of the first conductor portion 4a and the second conductor portion 4e on the left and right sides sandwiching the slit 40. FIG. 10 is a magnetic field intensity distribution on the Z axis of FIG. 9 generated by the current flowing through the fixed contact 4 obtained by the theoretical calculation, and a magnetic field component in which a positive magnetic field extends the arc A toward the terminal 5 (hereinafter, referred to as Arc driving magnetic field). As shown in FIG. 9, the first conductor portion 4e is
Is located right and left from the plane of rotation.

In such a conductor arrangement, the second conductor portion 4e
Due to the influence of the current flowing through the third conductor portion 4d, there is an arc driving magnetic field that extends the arc A toward the terminal portion 5 to the space region Z0 above the first conductor portion 4a, as shown in FIG.

Therefore, the arc A is moved from the fixed contact 3 to the first
The insulator 1 covering the inner surface of the slit 40 by receiving a strong electromagnetic force in the direction of the terminal portion 5 to a certain extent above the conductor portion 4a
5b and cooled. As a result, the arc voltage that has increased sharply immediately after the contact is opened further increases, and the high arc voltage is maintained, so that the current peak and the passing energy can be kept small, and excellent current limiting performance is obtained. The obtained circuit breaker is obtained.

Also, as in the first embodiment, the movable contact 2
Is not protruded above the arc-extinguishing side plate 7 in the open state, the arc above the first conductor 4a even when the movable contact 2 is fully opened above the first conductor 4a of the fixed contactor 4. Since A is sandwiched between the arc extinguishing side plates 7, the arc A in this portion also has the effect of limiting the cross-sectional area of the arc A and the effect of cooling. Further, the movable contact 1
Since the pressure in the lower space of the movable contact 1 also increases, a force for lifting the movable contact 1 acts, so that the opening speed of the movable contact 1 does not decrease and the current limiting performance is further improved.

Embodiment 2 FIG. FIG. 11 is a side view showing an electrode portion of a circuit breaker according to Embodiment 2 of the present invention. In the second embodiment, the current flowing through the second conductor portion 4e is substantially parallel to and opposite to the current flowing through the movable contact 1 when closed. With this configuration,
The force for extending the arc A due to the electromagnetic force of the current path of the second conductor portion 4e toward the terminal portion 5 increases, and between the movable contact 1 at the time of closing and the second conductor portion 4e of the fixed contact 4. Since the electromagnetic repulsive force acts on the movable contact 1, the rotating speed of the movable contact 1 increases, and the arc length immediately after the opening of the contact increases, so that the rise of the arc resistance is fast and the current limiting performance is further improved.

As in the second embodiment (FIG. 11),
When the current flowing through the portion 1a of the movable contact 1 at the time of closing is substantially below the first conductor portion 4a of the fixed contact 4, the portion 1a of the movable contact 1 and the fixed contact First of 4
Since the currents in the conductors 4a are drawn in the same direction as each other, the rotational speed of the movable contact 1 increases. As a result, the distance between the contacts at the initial stage of opening, that is, the arc length is increased earlier, so that the current limiting performance is improved.

Embodiment 3 FIG. FIG. 12A is a side view showing an electrode portion of a circuit breaker according to Embodiment 3 of the present invention.
13B is a front view of FIG. 12A from which the movable contact is omitted. The characteristic feature of the third embodiment lies in the configuration of the insulator 15 covering the first conductor 4a of the fixed contact 4. That is, the insulator 15 according to the third embodiment is
A surface insulator 15a covering the surface of the conductor portion 4a in the vicinity of a deep portion of the slit 40 (a slit end on the terminal portion 5 side);
An inner insulator 15b covering the inner surface of the slit 40 between the arc extinguishing side plates 7 on both sides and a hanging extension insulator 15c obtained by extending the inner insulator 15b downward as it is.

When the insulator 15 is configured in this manner, the first
Since the arc A below the conductor portion 4a is surrounded from all sides by the strong magnetic field generated by the fixed contact 4 and the left and right arc-extinguishing side plates 7 and the hanging extension insulator 15c, the cross-sectional area of the arc A is greatly reduced. The cooling effect by the arc-extinguishing side plate 7 and the insulator 15c also increases. Immediately after the contact is opened, the space under the first conductor portion 4a is surrounded on three sides, so that the pressure is likely to increase, and the force for lifting the movable contact 1 is increased by the increase in the pressure. Speed also increases. As a result, the current limiting performance is further improved.

Embodiment 4 FIG. FIG. 13 is a side view showing an electrode portion of a circuit breaker according to Embodiment 4 of the present invention. The characteristic feature of the fourth embodiment is that the distal end portion 1b of the movable contact 1 at the time of maximum opening protrudes above the arc-extinguishing side plate 7.

With this configuration, when a small current such as a load current is interrupted, the pressure of the arc A in the space between the arc extinguishing side plates 7 rises, so that the arc A near the movable contact 2 is moved to the arc extinguishing side plate 7. 7 receives the outward pressure Fp of the movable contact 2
The foot of the upper arc A easily moves to the tip 1 b of the movable contact 1. As a result, wear of the movable contact 2 due to the arc A is reduced, and the breaking performance is improved because the arc A extends for a long time.

Embodiment 5 FIG. FIG. 14 is a side view showing an electrode portion of a circuit breaker according to Embodiment 5 of the present invention. The feature of the fifth embodiment lies in the configuration of the arc-extinguishing side plate 7.
The arc-extinguishing side plate 7 according to the fifth embodiment is the first
A rising portion 7a above the conductor portion 4a is formed so as to be offset from the movable contact 2 at the time of maximum opening to the rotation center 14 side of the movable contact 1, and a first conductor that can be seen from the movable contact 2 at the time of opening. The upper surface of the portion 4a is configured to be insulated by a part 15d of the insulator 15.

With this configuration, when the movable contact 1 is opened to the maximum, the arc A is generated above the first conductor portion 4a by the pressure Fp of the space sandwiched between the arc extinguishing side plates 7. Is blown away toward the terminal portion 5 side, that is, the space that is not sandwiched between them. Further, the pressure from the space below the first conductor portion 4a is also applied, and the arc A is extended. As a result, the arc length above the first conductor portion 4a becomes longer,
The arc voltage is also increased and the current limiting performance is improved.

Since the arc A does not exist for a long time between the two arc-extinguishing side plates 7 above the first conductor portion 4a, damage to the arc-extinguishing side plate 7 due to the arc A is small, and the dielectric strength of the surface is reduced. Degradation is also reduced. Accordingly, dielectric breakdown via the surface of the arc-extinguishing side plate 7 between the movable contact 2 and the fixed contact 3 is less likely to occur, and the breaking performance is improved.

Embodiment 6 FIG. FIG. 15A is a side view showing an electrode portion of a circuit breaker according to Embodiment 6 of the present invention.
FIG. 15B is a cross-sectional view taken along the line CC of FIG. In the sixth embodiment, an upper protruding portion of the arc-extinguishing side plate 7 is formed so that the movable contact 2 of the movable contact 1 at the time of maximum opening is not sandwiched by the arc-extinguishing side plate 7. An inclined portion 7 b is formed on the upper protruding portion of the arc side plate 7.

As a result, the movable contact 2 at the time of maximum opening protrudes above the arc-extinguishing side plate 7, so that the upper surface of the first conductor portion 4 a outside the arc-extinguishing side plate 7 causes the metal vapor flow ejected from the movable contact 2 to flow. In order to prevent the insulator 15 from being exposed to
Portion 15d covering upper surfaces on both sides of slit 40 of conductor portion 4a
Is provided.

Here, the movable contact 1 during the opening is greatly affected by the electromagnetic force due to the current flowing through the first conductor 4a to pass by the side of the first conductor 4a. The pressure in the lower space of 4a is also received. Therefore, the movable contact 1 in the middle of the opening is swung right and left in FIG. 15B due to a slight imbalance of the pressure and electromagnetic force, and the movable contact 2 touches the left or right arc-extinguishing side plate 7 at the time of opening. There is a risk that it will.
Since the dielectric strength of the surface of the arc-extinguishing side plate 7 exposed to the arc A is extremely reduced, when the movable contact 2 is in contact with the arc-extinguishing side plate 7, the distance between the movable contact 2 and the fixed contact 3 is small. There is no danger of insulation failure due to lack of insulation. Even if the movable contact 2 does not touch the arc-extinguishing side plate 7 at the time of opening, if the insulation distance between the movable contact 2 and the arc-extinguishing side plate 7 is short, the dielectric breakdown between the movable contact 2 and the fixed contact 3 is eliminated. This occurs through the surface of the arc side plate 7, and sufficient blocking performance cannot be obtained.

However, according to the sixth embodiment, since the movable contact 2 in the opened state is not sandwiched between the arc-extinguishing side plates 7, the movable contact 2 touches the arc-extinguishing side plate 7 even if the movable contact 1 is shifted left and right. Never. Further, the insulation distance between the movable contact 2 and the arc-extinguishing side plate 7 can be increased. Therefore, there is no danger of the interruption being impossible as described above, and the current limiting performance and the interruption performance are improved.

FIG. 16 is a side view showing a circuit breaker having an arc-extinguishing side plate according to a modification of the sixth embodiment. In the arc-extinguishing side plate 7 according to this modified example, the rising portion from the first conductor portion 4a is most deviated toward the rotation center 14 of the movable contact 1 so that the movable contact 2 at the time of opening is not sandwiched by the arc-extinguishing side plate 7. In addition, the movable contact 1 at the time of opening is configured to be sandwiched by the arc-extinguishing side plate 7. With such a configuration, the same effect as that of the sixth embodiment can be obtained because the arc-extinguishing side plate 7 does not sandwich the movable contact 2 at the time of opening. In addition, since the portion of the movable contactor 1 at the time of opening that is closer to the rotation center 14 than the movable contact 2 is sandwiched by the arc-extinguishing side plate 7, the force for extending the arc A toward the terminal portion 5 by the pressure Fp increases.

Embodiment 7 FIG. FIG. 17 is a side view of a circuit breaker according to a seventh embodiment corresponding to the second and third aspects of the present invention. FIG. 18 is a front view of FIG. 17, and FIG. 18 does not show the movable contact 1 in FIG. doing. In the seventh embodiment, the upper end edge of the arc-extinguishing side plate 7 does not exceed the height range of the fixed contact 4. Further, the insulating portion 1 covering the upper surfaces on both sides of the slit 40 of the first conductor portion 4a exposed to the metal vapor flow from the movable contact 2 at the time of opening.
5 d is provided on the insulator 15.

Even with such a configuration, the arc A immediately after the opening generates a high arc voltage due to the action of the arc extinguishing side plate 7 and the arc driving magnetic field as described above.

That is, when the movable contact 2 is separated to a position above the first conductor 4a, the arc A is extinguished by the arc-extinguishing side plate 7 in the space above the first conductor 4a compared to the pressure in the space below the first conductor 4a. Is not sandwiched, the pressure does not increase, and as a result, the arc A is extended upward by the pressure Fp in the lower space. Further, the first conductor portion 4a
Since the pressure in the lower space is easily released upward and the area (pressure receiving area) of the arc-extinguishing side plate 7 is small, the force applied to the arc-extinguishing side plate 7 is small, and the mechanical strength of the arc-extinguishing side plate 7 is different. No longer needed.

As described above, the metal vapor flow spouting from the surface of the movable contact 2 is blown onto the insulator 15 covering the first conductor 4a to be cooled. At this time, the first
Since there is no arc extinguishing side plate 7 above the conductor 4a, the metal vapor flow from the movable contact 2 is also blown toward the insulator 15d on the upper surface on both sides of the slit 40 of the first conductor 4a.
It is not necessary to concentrate only on the insulator 15a that covers the terminal portion 5 side.

Accordingly, damage to the insulator 15a due to the arc A is reduced. Also, the insulator 1 on the terminal portion 5 side of the slit 40 of the first conductor portion 4a is generated by the electromagnetic force of the fixed contact 4.
As described above, it is possible to maintain a high arc voltage because it is forcibly cooled by being pressed against 5b. Furthermore, even if the movable contact 1 is shifted left and right in the open state, the movable contact 2 does not touch the arc-extinguishing side plate 7, so that the above-described inability to shut off does not occur.

FIG. 19 is a side view of a circuit breaker according to a modification of the seventh embodiment. In this modification, since the upper edge of the arc-extinguishing side plate 7 according to the seventh embodiment does not exceed the height range of the fixed contact 4, the arc extinguishing is performed in the space above the first conductor 4a of the fixed contact 4. The plate 6 can be easily arranged, and the arrangement of the arc extinguishing plate 6 can further improve the breaking performance.

Embodiment 8 FIG. FIG. 20 is a side view showing an electrode portion of a circuit breaker according to Embodiment 8 of the present invention. In the eighth embodiment, the arc-extinguishing side plate 7 is formed such that the space on the side of the terminal portion 5 below the first conductor portion 4a of the fixed contact 4 is not sandwiched by the arc-extinguishing side plate 7. In the arc-extinguishing side plate 7 according to the eighth embodiment, the end 7e on the terminal portion 5 side is formed at a right angle.
According to the eighth embodiment, since the space near the fixed contact 3 is sandwiched by the arc-extinguishing side plate 7 at the initial stage of opening or at the time of opening as shown in the figure, the pressure rises, and the rising pressure Fp causes the arc A to move to the terminal portion. The arc voltage is extended to the side 5, and the arc voltage can be increased by increasing the rising speed of the arc voltage at the beginning of opening or by strengthening the drive of the arc A to the insulator 15b at the time of opening.

FIG. 21 is a side view showing an electrode portion of a circuit breaker according to a modification of the eighth embodiment. In this modification, the end 7e of the arc-extinguishing side plate 7 on the terminal portion 5 side is inclined as shown in FIG. With this configuration, the same effect as that of the eighth embodiment can be obtained.

Embodiment 9 FIG. FIG. 22A is a side view showing an electrode portion of a circuit breaker according to Embodiment 9 of the present invention.
FIG. 23B is a front view of FIG. Example 9
In the circuit breaker provided with the arc-extinguishing side plate 7 which does not exceed the height range of the fixed contact 4 similarly to the case of the seventh to eighth embodiments, the inner surface of the slit 40 of the first conductor portion 4a is The insulator 15b covering the terminal portion 5 is extended downward to form a hanging extension insulating portion 15c.

According to the ninth embodiment, since the strong electromagnetic force in the direction of the terminal portion 5 acts on the arc A below the first conductor portion 4a, the arc A is caused by the drooping extension insulating portion 1 of the insulator 15.
5c to be forcibly cooled, and the cooling effect is improved. Since the direction of the terminal portion 5 of the first conductor portion 4a is blocked by the insulator 15c, the effect of limiting the arc cross-sectional area by the arc extinguishing side plates 7 on both sides works more effectively.

Embodiment 10 FIG. Figure 23 (a) is a side view showing the power supply portion of the circuit breaker according to the real施例10, FIG. 23 (b) is a sectional view taken along line D-D of FIG. 23 (a). In the tenth embodiment, in the arc-extinguishing side plate 7 in which the upper edge does not exceed the height range of the fixed contact 4, the lower end of the arc-extinguishing side plate 7 is configured to be lower than the fixed contact 3. I have.

By configuring the arc extinguishing side plate 7 in this manner, in the initial stage of opening shown in the drawing, the pressure generated by the heat of the arc A in the space below the first conductor portion 4a of the fixed contactor 4 is increased. It does not escape from the lower side of the arc-extinguishing side plate 7, and therefore the pressure increases. As a result, the pressure for pushing up the movable contact 1 increases, and the opening speed of the movable contact 1 in the initial stage of opening can be increased.

Further, as described above, the first contact
Since the electromagnetic force in the direction of the terminal portion 5 is strong in the space below the conductor portion 4a, the arc A cannot move in the opposite direction to the direction of the rotation center 14 of the movable contact 1, and furthermore, as in the tenth embodiment. In addition, since the pressure does not escape from below the arc-extinguishing side plate 7, the force for pushing the arc A toward the terminal portion 5 becomes extremely large. The arc A is greatly elongated in the direction of the terminal portion 5 by the force, and the initial rising speed of the arc voltage is increased. Also,
At the time of opening, the arc A is pressed against the inner insulator 15b of the insulator 15, and the cooling effect is also improved.

FIG. 24A is a side view showing an electrode portion of a circuit breaker according to a modification of FIG. 23, and FIG.
FIG. 3A is a sectional view taken along line EE of FIG. In this modification, the lower end of the arc-extinguishing side plate 7 is brought into contact with the second conductor portion 4e,
The second conductor portion 4e is formed wider than the mutual interval between the arc extinguishing side plates 7. Thereby, the escape of the pressure from the lower end of the arc extinguishing side plate 7 can be prevented.

Embodiment 11 FIG. FIG. 25 is a side view showing an electrode portion of a circuit breaker according to an eleventh embodiment corresponding to the invention of claim 4 , and FIG.
It is an F line sectional view. In the eleventh embodiment, the first embodiment
Contrary to the case of 0, the lower end of the arc-extinguishing side plate 7 is located above the fixed contact 3. That is, the lower ends of the arc extinguishing side plates 7 on both sides and the second
A gap S is provided between the conductor and the conductor 4E.

With such a configuration, the pressure in the space below the first conductor portion 4a of the fixed contact 4 can be released from the gap S at the lower end of the arc-extinguishing side plate 7, so that the space in the lower space can be reduced. The pressure rise can be kept low. As a result, the pressure applied to the arc-extinguishing side plate 7 decreases, and the mechanical strength required for the arc-extinguishing side plate 7 can be reduced. In addition, even if the dielectric strength of the surface of the arc-extinguishing side plate 7 at the time of current interruption is small and the dielectric breakdown from the fixed contact 3 through the surface of the arc-extinguishing side plate 7 to the movable contact 2 is to be performed, the electric contact between the fixed contact 3 and the arc-extinguishing side plate 7 can be prevented. Since the insulation distance between them can be increased, insulation breakdown does not occur, and the breaking performance is improved.

FIG. 27 is a side view showing an electrode part of a circuit breaker according to a modification of the eleventh embodiment. In this modification, the inclined side 7f is formed on the fixed contact 3 side of the arc-extinguishing side plate 7 so that the distance between the fixed contact 3 and the lower end of the arc-extinguishing side plate 7 is increased toward the terminal 5 side. It is characterized by having comprised in.

Here, the arc A extinguishes the arc-extinguishing side plate 7 due to the electromagnetic force generated by the fixed contact 4 and moves to the terminal 5 side. Therefore, the dielectric strength of the surface of the arc-extinguishing side plate 7 on the side of the terminal portion 5 is likely to deteriorate.

For this reason, with the above-described configuration as in this modification, the lower end of the arc-extinguishing side plate 7 is close to the height of the fixed contact 3 in a portion where the surface of the arc-extinguishing side plate 7 is less deteriorated. 7 can make the most of the arc cooling effect and the cross-sectional area limiting effect, and the lower end of the arc-extinguishing side plate 7 where the surface insulation deterioration is large is sufficiently higher than the fixed contact 3 and the insulation distance is set to be large. Flow performance and cutoff performance can be improved.

Embodiment 12 FIG. Figure 28 is a side view showing an electrode portion of a circuit breaker according to the real施例12, FIG. 29 is a line G-G cross-sectional view of FIG. 28. In the twelfth embodiment, the distance (hereinafter, referred to as the width) between the arc extinguishing side plates 7 on both sides is changed between the terminal portion 5 side and the opposite side.

That is, as shown in FIG. 29, between the arc extinguishing side plates 7 on both sides, a portion facing the trajectory of the movable contact 2 at the time of the opening operation is defined as a narrow portion 70a.
0a, the terminal portion 5 side is a wide portion 70b, and the narrow portion 7
When the width of Oa is L and the width of the wide portion 70b is M, the arc-extinguishing side plate 7 is configured to satisfy L <M.

When the arc-extinguishing side plate 7 is configured as described above, the small-current arc A generated between the contacts 2 and 3 immediately after the opening and before the high current does not become large is sandwiched by the narrow portion 70a of the arc-extinguishing side plate 7. Because of the narrow space, the effect of the arc-extinguishing side plate 7 as described above is easily received. This and the strong arc driving magnetic field generated by the fixed contact 4 speed up the rise of the arc voltage.

When the movable contact 1 further opens, the pressure Fp of the space sandwiched between the arc extinguishing side plates 7 on both sides and the arc A below the first conductor 4a of the fixed contact 4 Further, the fixed contact 4 is driven into a space sandwiched between the wide portions 70b of the arc extinguishing side plate 7 by a strong arc driving magnetic field generated by the fixed contact 4. Once the arc A reaches the wide portion 70b of the arc-extinguishing side plate 7
When entering the space between the wide portions 70b and the narrow portions 7
It is difficult for the arc A to return to the space 0a. As a result, the arc A is easily elongated and its state is easily maintained, so that a high arc voltage can be generated and maintained.

When the arc A is located in the space between the wide portions 70b of the arc-extinguishing side plates 7 in the space below the first conductor portion 4a, the space is large, so that the pressure rise is small and the arc A Since the distance to the wide portion 70b of the arc-extinguishing side plate 7 is also large, the wide portion 70b of the arc-extinguishing side plate 7 is large.
Of the surface exposed to the arc A is also reduced. As a result, the requirements for the mechanical strength and arc resistance required for the arc-extinguishing side plate 7 are relaxed.

FIG. 30 is a side view of an electrode portion of a circuit breaker according to a modification of the twelfth embodiment, and FIG. 31 is a plan view of FIG. In this modification, the height of the arc-extinguishing side plate 7 according to the twelfth embodiment does not exceed the first conductor portion 4a of the fixed contact 4, and the same effect as that of the twelfth embodiment can be obtained.

Embodiment 13 FIG. FIG. 32 is a side view showing an electrode part of a circuit breaker according to a thirteenth embodiment corresponding to the invention of claim 5 , and FIG.
It is an H-line sectional view. In the thirteenth embodiment, the narrow portion 70a and the wide portion 70b of the arc-extinguishing side plate 7 are reversed from those of the twelfth embodiment. That is, as shown in FIG. 33, the portion of the arc-extinguishing side plate 7 facing the trajectory of the movable contact 2 during the opening operation is formed as a wide portion 70b, and the arc-extinguishing from the wide portion 70b to the terminal portion 5 side is performed. The portion of the side plate 7 is formed as a narrow portion 70a.

In this way, a strong arc driving magnetic field Fm generated by the fixed contact 4 acts on the arc A in the space below the first conductor 4a of the fixed contact 4. For this reason, the arc A generated between the contacts 2 and 3 and located in the wide space between the wide portions 70b of the arc-extinguishing side plate 7 is reduced by the narrow portions 70a of the arc-extinguishing side plate 7.
It is pushed into the narrow space sandwiched between.

Generally, the pressure in the narrow space becomes larger, and it is difficult to hold the arc in the narrow space. However, the arc A can be pushed into the narrow space between the narrow portions 70a of the arc extinguishing side plate 7 only when there is an extremely large arc driving magnetic field Fm as in the present invention. The arc A pushed into the narrow space in this manner receives the effect of the arc extinguishing side plate 7 as described above, and generates a high arc voltage.

FIG. 34 is a side view showing an electrode part of a circuit breaker according to a modification of the thirteenth embodiment, and FIG. 35 is a plan view of FIG. In this modification, the height of the arc-extinguishing side plate 7 is configured not to exceed the first conductor 4a of the fixed contact 4. The arc-extinguishing side plate 7 is of an integral construction as shown in FIG. 35, and a notch 70 is formed in the arc-extinguishing side plate 7 so that the wide side 70b is formed by the notch 70.
And the narrow portion 70a are continuously formed. In this case, the same effect can be obtained.

FIG. 36 is a plan view of a fixed contact provided with an arc-extinguishing side plate according to another modification of the thirteenth embodiment. In this modification, the narrow portion 70a of the arc-extinguishing side plate 7 shown in FIG. The terminal portion 5 is formed in a V-shape in which the terminal portion 5 is gradually sharpened, and the same effect as that of the thirteenth embodiment can be obtained.

FIG. 37 is a plan view of a fixed contact provided with an arc-extinguishing side plate according to another modification of the thirteenth embodiment. In this modification, the narrow portion 70a of the arc-extinguishing side plate 7 corresponds to the case of FIG. On the contrary, the terminal portion 5 is formed so that the width thereof is gradually increased. In this case, the same effect can be obtained.

FIG. 38A is a side view showing an electrode portion of a circuit breaker according to a modification of the thirteenth embodiment, and FIG.
FIG. 8A is a cross-sectional view taken along line II of FIG.
It is a top view of (a). In this modification, the narrow portion 70a of the arc-extinguishing side plate 7 is formed in the upper portion on the terminal portion 5 side, and the same effect can be obtained in this case.

In the above, an inorganic or organic insulating material can be used for the arc-extinguishing side plate 7 and the insulator 15 in the present invention. The use of an inorganic insulator can reduce damage to the surface exposed to the arc. Further, if an organic insulator is used, a large amount of decomposed gas is released from the surface exposed to the arc, so that the arc cooling effect becomes extremely large. Even in the case of an organic insulator, a melamine phenol-based material releases an arc-extinguishing gas well and does not cause surface insulation deterioration. Therefore, when the arc-extinguishing side plate 7 or the insulator 15 is formed of a melamine-phenol-based organic material, current-limiting performance and The blocking performance can be further improved.

In each of the above embodiments, the case of a circuit breaker has been described. However, another switch may be used, and the same effect as that of the above embodiment can be obtained.

[0114]

As described above, according to the first aspect of the invention, the arc generated between the contacts is sandwiched between the arc extinguishing side plates on both sides, and the arc extinguishing side plates are arranged in the width direction between the arc extinguishing side plates. The spread of the arc to
By applying a strong arc driving magnetic field to the arc immediately after opening, the effect of the arc-extinguishing side plate can be greatly exerted.In the open state, the arc can be forcibly pressed against the insulator and cooled. In addition, there is an effect that a switch having excellent current limiting performance can be obtained.

According to the second aspect of the invention, the arc immediately after the opening is opened.
A strong arc driving magnetic field is applied to the
Exerts a large effect, forcing the arc in the open state
It can be cooled by pressing against insulation, and it can be opened further
The movable contact protrudes from the arc-extinguishing side plate
Even if insulation on the surface of the arc-extinguishing side plate deteriorates,
Current limiting performance due to high dielectric strength between moving contacts
There is an effect that a switch excellent in the above can be obtained.

According to the third aspect of the invention, the arc immediately after the opening is opened.
A strong arc driving magnetic field is applied to the
Exerts a large effect, forcing the arc in the open state
It can be cooled by pressing against an insulator, and the first conductor
Arc blows upward due to pressure increase in the space below the part
Prolong the extension arc and open the movable contact
Since the speed also increases, a switch with excellent current limiting
There is effect that can get.

According to the invention of claim 4, the arc immediately after the opening is opened.
A strong arc driving magnetic field is applied to the
Exerts a large effect, forcing the arc in the open state
It can be cooled by pressing against an insulator, and the first conductor
To release the pressure in the space below the part from the lower end of the arc-extinguishing side plate,
Since the force applied to the arc-extinguishing side plate can be reduced, mechanical
There is an effect that it is possible to obtain an open / close device excellent in current limiting performance that does not require much strength .

According to the fifth aspect of the invention, the arc immediately after the opening is opened.
A strong arc driving magnetic field is applied to the
Exerts a large effect, forcing the arc in the open state
It can be cooled by pressing against an insulator, and it can be moved further.
Compared to the distance between the arc-extinguishing side plates in the
Because the width between the arc-extinguishing side plates on the source system side was reduced, the current
There is an effect that a switch having excellent breaking performance can be obtained .

[0119]

[0120]

[0121]

[0122]

[Brief description of the drawings]

FIG. 1 is a side view of an arc extinguishing unit showing a closed state of a circuit breaker according to a first embodiment corresponding to the first aspect of the present invention.

2 is a view to side view of an open state of the circuit breaker of Figure 1.

FIG. 3 is a plan view of a fixed contact including the arc-extinguishing side plate in FIGS. 1 and 2;

FIG. 4 is a front view of FIG. 3;

FIG. 5 is a perspective view of FIG. 3;

FIG. 6 is an operation explanatory diagram of the circuit breaker showing a state immediately after the contact is opened in the first embodiment.

FIG. 7 is a sectional view taken along the line AA of FIG. 6;

FIG. 8 is an explanatory diagram of the operation of the circuit breaker showing the maximum opening state of FIG. 6;

FIG. 9 is a sectional view taken along line BB of FIG. 8;

FIG. 10 is a graph showing a magnetic field intensity distribution generated by a current flowing through a fixed contact on the Z axis in FIG. 9;

FIG. 11 is a side view showing a contact closed state of the circuit breaker according to Embodiment 2 of the present invention.

FIG. 12 (a) is a side view showing an electrode part of a circuit breaker according to Embodiment 3 of the present invention. FIG. 12B is a front view in which the movable contact of FIG. 12A is omitted.

FIG. 13 is a side view showing an electrode portion of a circuit breaker according to Embodiment 4 of the present invention.

FIG. 14 is a side view showing an electrode part of a circuit breaker according to Embodiment 5 of the present invention.

FIG. 15 (a) is a side view showing an electrode portion of a circuit breaker according to Embodiment 6 of the present invention. FIG. 15B is a cross-sectional view taken along the line CC of FIG.

FIG. 16 is a side view showing a circuit breaker including an arc extinguishing side plate according to a modification of FIG.

FIG. 17 is a side view of a circuit breaker according to a seventh embodiment corresponding to the second and third aspects of the present invention.

18 is a front view of FIG.

FIG. 19 is a side view of a circuit breaker according to a modification of the seventh embodiment.

FIG. 20 is a side view showing an electrode portion of a circuit breaker according to Embodiment 8 of the present invention.

FIG. 21 is a side view showing an electrode part of a circuit breaker according to a modification of the eighth embodiment.

FIG. 22 (a) is a side view showing an electrode part of a circuit breaker according to Embodiment 9 of the present invention. FIG. 22B is a front view of FIG.

[23] FIG. 23 (a) is a side view showing the power supply portion of the circuit breaker according to the actual施例10. FIG. 23B is a cross-sectional view taken along line DD of FIG.

24 (a) is a side view of an electrode portion of a circuit breaker according to a modification of FIG. FIG. 24B is a cross-sectional view taken along line EE of FIG.

FIG. 25 is a side view showing an electrode part of a circuit breaker according to Embodiment 11 corresponding to the invention of claim 4 ;

26 is a sectional view taken along line FF of FIG. 25.

FIG. 27 is a side view showing an electrode part of a circuit breaker according to a modification of the eleventh embodiment.

Figure 28 is a side view showing an electrode portion of a circuit breaker according to the actual施例12.

29 is a sectional view taken along line GG of FIG. 28.

FIG. 30 is a side view showing an electrode part of a circuit breaker according to a modification of the twelfth embodiment.

FIG. 31 is a plan view of FIG. 30.

FIG. 32 is a side view showing an electrode part of a circuit breaker according to Embodiment 13 corresponding to the invention of claim 5 ;

FIG. 33 is a sectional view taken along line HH of FIG. 32;

FIG. 34 is a side view showing an electrode part of a circuit breaker according to a modification of the thirteenth embodiment.

FIG. 35 is a plan view of FIG. 34;

FIG. 36 is a plan view of a fixed contact provided with an arc-extinguishing side plate according to another modification of the thirteenth embodiment.

FIG. 37 is a plan view of a fixed contact provided with an arc-extinguishing side plate according to another modification of the thirteenth embodiment.

FIG. 38 (a) is a side view showing an electrode part of a circuit breaker according to a modification of the thirteenth embodiment. FIG. 38B is a cross-sectional view taken along the line II of FIG. FIG. 38 (c) is a plan view of FIG. 38 (a).

FIG. 39 is a side view showing an open state of a conventional circuit breaker, for example, a circuit breaker.

FIG. 40 is a side view showing a state of the circuit breaker of FIG. 39 immediately after a contact is opened.

FIG. 41 is a side view showing a state in which a movable contact in the circuit breaker of FIG. 40 is in a maximum open state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable contact 2 Movable contact 3 Fixed contact 4 Fixed contact 4a 1st conductor part 4d 3rd conductor part 4e 2nd conductor part 7 Arc extinguishing side plate 15 Insulator

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichi Nishina 1-8 Midoricho, Fukuyama City Mitsubishi Electric Corporation Fukuyama Works (72) Inventor Shinji Yamagata 1-8 Midorimachi Fukuyama City Mitsubishi Electric Corporation Fukuyama Works ( 56) References JP-A-4-262334 (JP, A) JP-A-62-123627 (JP, A) JP-A-62-88351 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , (DB name) H01H 69/00-83/22

Claims (5)

(57) [Claims] A movable contact having a movable contact at one end thereof; and a fixed contact having a fixed contact at one end capable of coming into contact with and separating from the movable contact when the movable contact is opened and closed. In a switch for connecting a power supply system to a contact, when the opening and closing direction of the contacts is set to a vertical direction, the fixed contact is connected to the power supply system, a first conductor portion, a second conductor portion having the fixed contact, And a third conductor portion connecting the first conductor portion and the second conductor portion in the vertical direction, and the third conductor portion is not provided with a movable contact of a movable contact from the position of the fixed contact. The first conductor portion is disposed on the other end side and on the opposite side of the power supply system, and is disposed above the contact contact surface when the contact is closed, and is disposed above the contact surface of the movable contact when the contact is opened. Disposed below, and the movable contact is provided when the contact is opened. A portion of the first conductor portion, which can be seen from the surface, is covered with an insulator, and the movable contacts have arc extinguishing side plates disposed on both sides of a plane including the locus of the movable contact at the time of opening and closing. A switch, wherein one of the switches is provided between the plane and a portion corresponding to the plane of the first conductor portion. 2. The switch according to claim 1, wherein the arc-extinguishing side plate is formed such that a movable contact when the movable contact is in an open state protrudes upward. 3. The switch according to claim 1, wherein the arc-extinguishing side plate is formed such that an upper side of the arc-extinguishing side plate does not exceed a height range of the first conductor portion. 4. An arc extinguishing side plate such that an upper side of the arc extinguishing side plate does not exceed a height range of the first conductor portion and a lower end of the arc extinguishing side plate is positioned above the fixed contact. The switch according to claim 1, wherein the switch is formed. 5. When the distance between the arc-extinguishing side plates is a width, the width of a portion of the arc-extinguishing side plates opposed to the locus on the power supply system side relative to the locus of the movable contact is defined as a width. 2. The switch according to claim 1, wherein a portion having a smaller width is provided.