JPH07282710A - Open/close device - Google Patents

Abstract

PURPOSE:To provide an open/close device superior in limit current cutoff characteristics. CONSTITUTION:A movable contact 2 is fixed to a movable contact maker 1, a fixed contact 3 is fixed to one end of a fixed contact maker 4 and a terminal part 6 is fixed to the other end, and a connection conductor 7 connects the fixed contact 3 to the terminal part 6. A cut groove 20 is opened at the erected part of the connection conductor 7. An arc A is generated, when the movable contact 2 and the fixed contact 3 are separated from each other at cutoff, and driven by a magnetic field generated by electric current flowing in the movable contact maker 1 so as to transfer in the direction of the cut groove 20, cooled, and cut off by a base 15. The current in the connection conductor on both sides of the cut groove 20 works in such a way as pushing back the arc to the contact side, however, there is the cut groove 20 in the center part of the connection conductor 7 having the largest push-back force so that cutoff performance can be improved by weakening the push-back force.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 129 is a side view showing a state in which a conventional circuit breaker is opened. In the figure, 1 is a movable contactor, 2 is a movable contact fixed to one end of the movable contactor 3,
Is a fixed contact 4 which is brought into contact with and separated from the movable contact 2 by the rotation of the movable contact 1, 4 is a fixed contact having a fixed contact 3, and the fixed contact 4 is provided at one end with a contact plate 5 to which the fixed contact 3 is fixed. Connection conductor 7 having terminal portion 6 and the other end connected to contact plate 5
Consists of. As shown in the figure, the contact plate 5 has an end portion to which the fixed contact 3 is fixed facing the direction of the terminal portion 6, and the other end is connected to the connecting conductor 7 and the connecting conductor 7 in this portion. The contact plate 5 has a substantially U shape.

Reference numeral 8 denotes an arc extinguishing plate, which has a substantially horseshoe shape with a notch along the locus of rotation of the movable contact 1 so as not to hinder the rotation of the movable contact 1. Reference numeral 9 is an arc-extinguishing side plate that holds the arc-extinguishing plate 8. 10 is a mechanism for rotating the movable contact 1, 11 is a handle for manually operating the mechanism 10, 12 is another terminal, and 13 is a conductor for connecting the movable contact 1 and the terminal 12. is there. Reference numeral 14 is a container for accommodating them, and includes a base 15 and a cover 16. Reference numeral 17 is an exhaust hole provided in the cover 16.

Next, the operation will be described. In the state of FIG. 129, the terminal portion 6 is connected to the power source and the terminal portion 12 is connected to the load,
Operate the handle 11. Then, the mechanism portion 10 operates and the movable contact 1 rotates about a rotation center (not shown) provided at one end, so that the movable contact 2 comes into contact with the fixed contact 3. FIG. 130 shows the closed state of the movable contact 1.
Power is supplied from the power supply to the load. At this time, the movable contact 2 is pressed against the fixed contact 3 with a prescribed contact pressure in order to ensure reliability of energization.

Here, the handle 11 is operated to operate the mechanism portion 10, or a short circuit accident occurs in the load side circuit and a fault current flows in the circuit, and a current detection portion (not shown) provided in the mechanism portion 10 is shown. When the mechanical part 10 is operated by (1), the movable contact 1 rotates to move the movable contact 2 and the fixed contact 3
And the arc is generated between the contacts 2 and 3. This state is shown in FIG. 131. When a large current flows due to a short-circuit current or the like, the electromagnetic repulsive force at the contact surfaces of the contacts 2 and 3 becomes very strong, and the contact pressure applied to the movable contact 2 is overcome, so that the movable contactor It is well known that 1 rotates without waiting for the operation of the mechanical section 10 to open the contacts 2 and 3.

The arc A generated between the contacts 2 and 3 is attracted by the arc extinguishing plate 8 in the direction of the arc extinguishing plate 8, that is, the terminal portion 6.
It is driven in the direction and stretched. As a result, the arc A is cooled by the arc extinguishing plate 8 and the arc A is elongated for a long time, so that the arc voltage rises and the arc A is extinguished at the current zero point, and the current interruption is completed. Further, if the arc voltage can be increased at an early stage immediately after the arc A is generated, such as when the short circuit is cut off, it is possible to limit the short circuit current to a small current limit.

In order to improve the breaking performance and the current limiting performance of the circuit breaker, it is necessary to increase the arc voltage as described above.
For this, the arc must be stretched and cooled. Other than the arc-extinguishing plate 8, a method that is often used as a method for extending an arc is, for example, Japanese Patent Laid-Open No. 60-49533.
This method utilizes a fixed contactor shape as disclosed in Japanese Patent Laid-Open Publication No. 2-68831. The shape of the fixed contactor shown therein is basically the same as the shape of the fixed contactor 4 shown in FIG.

If the current flows through the fixed contactor 4 in FIG.
Through the connecting conductor 7 and the contact plate 5 to the fixed contact 3. The current flowing through the contact plate 5 is the arc A on the fixed contact 3.
Generates a magnetic field B in this space from the back of the paper. Therefore, this magnetic field B exerts an electromagnetic force F in the direction of the terminal portion 6 on the current of the arc A. The arc A is stretched in the direction of the terminal portion 6 by this electromagnetic force F, and the arc extinguishing plate 8 is effectively cooled by adding the suction effect of the arc extinguishing plate 8. With these, a circuit breaker having an excellent breaking performance can be obtained.

[0009]

In a switch such as a circuit breaker, as shown in FIG. 133, in order to match with a conventional product and to secure an insulation distance, the terminal portion 6 from the mounting surface 19 is removed. Height A cannot be made too low.
On the other hand, there is an increasing demand for miniaturization, and it is desired to reduce the dimension B in the length direction and the dimension C in the height direction. Further, in order to secure the breaking performance, the contact distance D between the movable contact 2 and the fixed contact 3 needs to be increased.

As a result, as shown in FIG. 129, the contact surface of the fixed contact 3 has to be installed at a position lower than the terminal portion 6. Therefore, as shown in FIG. 133, the connection conductor 7a at the rising portion in the vertical direction is required on the terminal portion 6 side of the connection conductor 7. This connecting conductor 7
The connecting conductor 7a of 1 faces the space between the movable contact 2 and the fixed contact 3. Further, in order to further reduce the dimension B in the lengthwise direction of the circuit breaker, the above-mentioned space and the connecting conductor 7a are close to each other in the actual situation.

Now, consider again the electromagnetic force to the arc caused by the current flowing through the fixed contact 4, but the current other than the current flowing through the contact plate 5. Assuming that a current flows from the terminal portion 6 as indicated by the arrow in FIG. 134, the magnetic field created by the current flowing in the connection conductor 7a of the connection conductor 7 (the downward current in the figure) is the space of the arc A, and the space from here to the back. The direction of the direction. This magnetic field generates an electromagnetic force F that drives the arc A in the direction opposite to the terminal portion 6. In short, it can be said that the current flowing through the connecting conductor 7a and the arc A are substantially parallel and opposite to each other, so that repulsive forces are exerted on each other and the arc A is driven in the opposite direction to the terminal portion 6. Further, the current flowing in the substantially horizontal portion below the contact plate 5 of the connection conductor 7 also generates a magnetic field in the space of the arc A in the direction away from this side of the paper, and this electromagnetic force also drives the arc A in the direction opposite to the terminal portion 6. To do.

Further, FIG. 1 shows the AA cross section of FIG.
35, the arc A created by the connecting conductor 7a is connected to the terminal portion 6
The magnetic field driving in the direction opposite to the above takes the largest value B on the center line in the longitudinal direction of the fixed contact, and when deviating from the center line, the component B1 of the magnetic field driving the arc A in the opposite direction becomes small. Therefore, for example, even if the arc A is driven in the direction of the terminal portion 6 by the current of the contact plate 5, it is driven to the end deviated from the center line, avoiding the center line where the reverse driving magnetic field is strong. And at a position off the center line,
Obviously, the driving magnetic field by the contact plate 5 also weakens, so that the arc A is no longer driven in the direction of the terminal portion 6. From the above, the arc generated between the contacts at the time of current interruption cannot be sufficiently extended, and therefore the cooling action of the arc extinguishing plate 8 cannot be sufficiently exerted, so that the required current limiting interruption performance can be obtained. There was a problem of not having.

Claims 1, 2, 3, 6, 7, 9, 11, 1
The inventions 2, 13, and 14 are made to solve the above problems, and an object thereof is to obtain a switch having a simple configuration and excellent current limiting interruption performance.

It is an object of the present invention to provide a switch having a simple structure and an improved current limiting interrupting performance especially when interrupting a large current.

It is an object of the present invention to provide a switch having improved reliability of breaking performance.

It is an object of the present invention to provide a switch which has a simple structure and does not deteriorate in breaking performance even in a frequent breaking operation.

It is an object of the present invention to obtain a switch which can prevent damage to a container due to an increase in pressure inside the container when the current is cut off.

It is an object of the invention of claim 16 to obtain a switch having excellent current limiting interrupting performance as in the switch of claim 1 even when the interrupting current becomes large.

According to the inventions of claims 17, 18 and 19, it is possible to obtain a switch having an excellent current limiting interrupting performance as in the case of the switch according to claim 1 even when the arc driving force of the arc extinguishing plate or the like is weak. To aim.

The invention of claim 20 aims at obtaining a switch having a current limiting interrupting performance which is further superior to that of the switch of claim 17.

The inventions of claims 21, 22 and 23 are intended to obtain a switch having a current limiting interrupting performance which is further superior to that of the switch of claim 20.

The inventions of claims 24, 25 and 26 are intended to obtain a switch having a further excellent breaking performance than the switch of claim 23.

It is an object of the present invention to obtain a switch having excellent current limiting interruption performance.

[0024]

A switch according to a first aspect of the present invention is provided with a movable contact having a movable contact and a fixed contact which can be brought into contact with and separated from the movable contact at one end by opening and closing the movable contact. In addition, in a switch provided with a fixed contactor whose other end is a terminal part via the connection conductor part from this one end, an operation in which the movable contact and the fixed contact are brought into contact with and separated from the connection conductor part. In addition to having a rising portion facing the line, the rising portion is provided with a first opening facing the operating line.

A switch according to a second aspect of the present invention is the switch according to the first aspect, wherein an arc cooling member is provided inside the first opening provided in the rising portion of the connection conductor portion, or a switch main body as the arc cooling member. A base for holding is arranged.

A switch according to a third aspect is the switch according to the second aspect, wherein an arc runner extending from the vicinity of the fixed contact of the fixed contact to the first opening is provided.

According to a fourth aspect of the present invention, in the switch according to the third aspect, the tip of the arc runner faces downward when the direction in which the movable contact separates from the fixed contact is upward.

A switch according to a fifth aspect of the present invention is the switch according to the third aspect, wherein when the direction in which the movable contact is separated from the fixed contact is upward, the tip of the arc runner is directed upward, and the tip and the movable contact are arranged upward. The shortest distance to the movable contact including
At the position of the movable contact at the shortest distance, the movable contact including the movable contact is arranged to be shorter than the shortest distance between the rising portion of the connection conductor of the fixed contact.

A switch according to a sixth aspect of the present invention is the switch according to any one of the third to fifth aspects, wherein the width of at least the tip of the arc runner is narrower than the width of the first opening.

A switch according to a seventh aspect is the switch according to the third or fourth aspect, wherein the tip end portion of the arc runner is inserted into the first opening portion.

According to an eighth aspect of the present invention, in the switch of the seventh aspect, the cross-sectional area of the fixed contact side portion of the arc runner is larger than the cross-sectional area of the tip end portion of the arc runner.

A switch according to a ninth aspect is the switch according to the third or fourth aspect, wherein the tip end portion of the arc runner penetrates through the first opening portion.

According to a tenth aspect of the present invention, in the switch of the third aspect, the arc runner is inserted into the first opening and bent upward when the direction in which the movable contact is separated from the fixed contact is upward. The tip portion thereof is configured to project upward from the inside of the first opening portion.

A switch according to an eleventh aspect of the present invention is the switch according to the second aspect, wherein the arc horn extends from the vicinity of the movable contact of the movable contactor toward the first opening at the closed position of the movable contact. It is provided.

According to a twelfth aspect of the present invention, in the switch of the eleventh aspect, the tip of the arc horn is inserted into the first opening when the movable contact is closed.

According to a thirteenth aspect of the present invention, in the switch according to the second aspect, an arc runner extending from the vicinity of the fixed contact of the fixed contactor toward the first opening is provided and the movable contact is closed at the closed position. The arc horn is provided so as to extend from the vicinity of the movable contact toward the first opening.

A switch according to a fourteenth aspect is the switch according to the thirteenth aspect, wherein the tip of the arc runner is inserted into the first opening, and the tip of the arc horn is closed when the movable contact is closed. It is configured to be inserted into the first opening.

According to a fifteenth aspect of the present invention, in the switch according to the thirteenth aspect, the tip of the arc runner is located in front of the first opening, and the tip of the arc horn closes the movable contact. Sometimes inserted into the first opening,
When the movable contact is opened, the movable contact is separated from the first opening.

A switch according to a sixteenth aspect of the present invention is the switch according to the first or second aspect, wherein an insulator is provided to insulate at least the side of the connecting conductor portion around the first opening facing the movable contact.

According to a seventeenth aspect of the present invention, in the switchgear according to the first or second aspect, the fixed contact has the fixed contact mounting side folded upward when the direction in which the movable contact is separated from the fixed contact is upward. Then, the folded contact portion is used as a contact plate to mount the fixed contact.

A switch according to an eighteenth aspect of the present invention is the switch according to the seventeenth aspect, wherein the fixed contact is provided with a second opening at a portion of the connection conductor portion located below the contact plate, the portion facing the contact plate. It was done.

A switch according to a nineteenth aspect of the present invention is the switch according to the eighteenth aspect, wherein the opening portion of the fixed contact is formed by connecting the first opening portion of the rising portion and the second opening portion facing the contact plate. It is an opening.

According to a twentieth aspect of the invention, in the switch according to the second aspect, when the direction in which the movable contact separates from the fixed contact is upward, the fixed contact has its fixed contact mounting side folded back upward. A fixed contact is attached using the folded portion as a contact plate, and a second opening is provided in a portion of the connection conductor portion located below the contact plate, the portion facing the contact plate, and
A fixed contact is provided in which the width of the connecting conductor portion below the contact plate is wider than the width of the contact plate, and an arc runner is provided. This arc runner has a first opening from the vicinity of the contact plate to the tip thereof. The arc runner is made of a magnetic material so as to extend toward the portion and cover at least the connecting conductor portions on both sides of the contact plate.

A switch according to a twenty-first aspect of the present invention is the switch according to the twentieth aspect, wherein the tip end portion of the arc runner is not in electrical contact with the connecting conductor portion.

A switch according to a twenty-second aspect of the present invention is the arc runner according to the twentieth or twenty-first aspect, in which a part of the arc runner is inserted between the contact plate and a connecting conductor portion below the contact plate. It is composed.

A switch according to claim 23 is a switch according to claim 20.
22. In any one of 22 above, the tip end portion of the arc runner is configured to be inserted into the first opening portion of the rising portion of the connection conductor portion.

A switch according to a twenty-fourth aspect of the present invention is the switch according to the second aspect, wherein, when the direction in which the movable contact separates from the fixed contact is upward, the fixed contact is folded upward at the fixed contact mounting side. A fixed contact is attached using the folded portion as a contact plate, and a second opening is provided in a portion of the connection conductor portion located below the contact plate, the portion facing the contact plate, and
A fixed contact is provided in which the width of the connecting conductor portion below the contact plate is wider than the width of the contact plate, and an arc runner made of a substantially U-shaped magnetic body is provided. The leg portions are arranged so as to cover the connection conductor portions on both sides of the contact plate, and the tips of the U-shaped leg portions are attached to the connection conductor portions in the vicinity where the contact plate and the connection conductor portions are connected. , Except that the arc runner is not in electrical contact with the connecting conductor except for the mounting part to which the arc runner is mounted, and the tip of the arc runner, which corresponds to the U-shaped bottom, is inserted into the first opening. It is configured to.

A switch according to a twenty-fifth aspect is the switch according to the eighteenth aspect.
24. In any one of 24, arrangement of the fixed contact and the fixed contact is formed from respective centroid points of cross sections of the left and right connecting conductors on both sides of the second opening and a center point of the fixed contact surface. Is an isosceles triangle and is arranged such that its base angle is less than 45 degrees.

A switch according to claim 26 is a switch according to claim 20.
22. In any one of 22 above, the tip of the arc runner is bent upward, and the shortest distance between the tip and the movable contact including the movable contact is the movable contact at the position of the movable contact at the shortest distance. It is arranged so as to be smaller than the shortest distance between the movable contact including the contact and the rising portion of the connecting conductor of the fixed contact.

According to a twenty-seventh aspect of the present invention, in a switch, a movable contact having a movable contact and a fixed contact which can be brought into contact with and separated from the movable contact by opening and closing the movable contact are provided at one end.
In a switch equipped with a fixed contactor whose other end is a terminal part via the connection conductor part from this one end, when the direction in which the movable contact is separated from the fixed contact is upward, the fixed contactor is Fold back the fixed contact mounting side,
A fixed contact is mounted by using the folded portion as a contact plate, and a second opening is provided in a portion of the connection conductor portion located below the contact plate, the portion facing the contact plate, and the second opening A fixed contactor which is an isosceles triangle formed from the respective centroids of the cross sections of the left and right connecting conductors on both sides and the center point of the fixed contact surface, and whose base angle is less than 45 degrees; It was done.

A switch according to a twenty-eighth aspect of the present invention is the switch according to the twenty-seventh aspect, wherein an insulator is inserted at least between the contact plate and the connecting conductor portion near the second opening.

[0052]

In the switch according to the invention of claim 1, the first opening provided at the rising portion of the connecting conductor portion reduces the magnetic field component for returning the arc to the contact side, thereby improving the current limiting interruption performance.

In the switch according to the second aspect of the invention, the arc is brought into contact with the arc cooling member inside the first opening, and the arc is cooled by the steam generated from this member to raise the arc voltage.

In the switch of the third aspect of the present invention, the arc runner is used to bring the arc spot of the fixed contact side closer to the arc cooling member in the first opening to increase the arc cooling action of the steam of the arc cooling member. Increase the arc voltage.

In the switch according to the invention of claim 4, the tip of the arc runner is directed downward, and the direction in which the arc is blown is the direction of the arc cooling member in the first opening. The arc voltage can be increased especially when a large current is interrupted.

In the switch according to the invention of claim 5, the shortest distance between the tip of the movable contact and the arc runner is set closer than the shortest distance between the tip of the movable contact and the connecting conductor. Since it is possible to prevent commutation to the portion of the fixed contactor and to maintain the electromagnetic force that extends the arc, it is difficult for the disconnection failure to occur.

In the switch according to the invention of claim 6, since the width of at least the tip of the arc runner is made narrower than the width of the first opening of the connecting conductor, the arc is reliably cooled in the first opening. The member can be cooled by touching it, and the arc voltage can be increased.

In the switch according to the invention of claim 7, since the tip of the arc runner is inserted into the first opening, the arc spot on the fixed contact side and the arc in the first opening. Since the distance to the cooling member can be made smaller and the action of cooling the arc is further improved, the arc voltage can be further increased.

In the switch according to the invention of claim 8, the cross-sectional area of the fixed contact side is larger than the tip of the arc runner in the first opening, so that the heat capacity of the arc runner is increased. It is possible to reduce the wear of the runner.

In the switch according to the invention of claim 9, since the tip of the arc runner penetrates through the first opening, when the arc spot reaches the tip of the arc runner, the arc and the arc cooling member are separated from each other. Since the distance becomes short and the function of cooling the arc is improved, and the diameter of the arc column is limited by the width of the first opening, the arc voltage can be increased.

In the switch according to the invention of claim 10, the arc runner is inserted into the first opening and bent upward, so that the tip of the arc runner projects upward from the inside of the first opening. Therefore, in the initial stage of opening, the arc hits the arc cooling member in the first opening and is cooled, and in the latter half of the breaking operation, the arc travels to the tip of the arc runner and reduces the vapor generated from the arc cooling member, Prevent damage to the container due to increased pressure.

In the switch according to the invention of claim 11, since the arc horn is provided, the arc travels to the tip of the arc horn and approaches the arc cooling member in the first opening, so that the vapor from the arc cooling member is used. The cooling effect of the arc is increased and the arc voltage can be increased.

In the switch of the twelfth aspect of the invention, since the tip of the arc horn at the time of closing is contained in the first opening, the arc spot on the movable contact side and the first opening are particularly in the initial stage of opening. The distance from the arc cooling member in the section is shortened, the arc cooling action by the steam of the arc cooling member is improved, and the arc voltage can be quickly raised.

Since the switch according to the invention of claim 13 is provided with the arc runner and the arc horn,
The distance between the arc cooling member and the arc cooling member is shortened, the arc cooling action of the steam of the arc cooling member is improved, and the arc voltage can be increased.

In the switch of the fourteenth aspect of the invention, since the tip of the arc runner and the tip of the arc horn are put in the first opening when the switch is closed, each of the fixed contact side and the movable contact side. The distance between the arc spot and the arc cooling member in the first opening becomes closer, the arc cooling action by the steam of the arc cooling member is further improved, and the arc voltage can be further increased.

According to a fifteenth aspect of the invention, in the switch, the tip of the arc runner is located in front of the first opening, and the tip of the arc horn is inserted into the first opening at the time of closing to open. Since the first opening is sometimes separated, in the latter half of the breaking operation, the arc is moved away from the arc cooling member in the first opening to reduce the amount of vapor generated from the arc cooling member and reduce the pressure generated in the container. can do.

The switch according to the invention of claim 16 is the first switch
Since the connecting conductor around the opening is electrically insulated by the insulator, the diameter of the arc becomes large and the arc resists the electromagnetic repulsive force and approaches the connecting conductor around the first opening. Then, the arc is also cooled by the pyrolysis gas released from the insulator, and the width of the arc is reduced, so that the arc easily enters the first opening, and the arc is further cooled. Particularly in a high current arc, the arc easily extends into the first opening and can be cooled.

In the switch according to the invention of claim 17, the fixed contact mounting side of the fixed contact is folded back upward.
Since the fixed contact is used as the contact plate with the folded portion, the current flowing through the contact plate causes the arc to be the first
Of the contact plate, the distance between the connecting conductor below the contact plate and the arc becomes large, so that the force for pushing the arc back to the contact side becomes weak, and the arc becomes the first opening. Of the arc cooling member, so that a large amount of pyrolysis gas of the arc cooling member is generated and the arc is cooled. Therefore, it can be applied even when the arc driving force of the arc extinguishing plate or the like is weak.

Since the switch according to the eighteenth aspect of the present invention is configured such that the second opening is provided in a portion of the connection conductor portion located below the contact plate of the fixed contact facing the contact plate.
Since the current flowing in the connecting conductors on both sides of the second opening is shunted to both sides, the relative distance to the arc becomes larger than that without the second opening, and the force for pushing back the arc becomes smaller and the arc The arc cooling member of the first opening is strongly pressed, so that a large amount of pyrolysis gas of the arc cooling member is generated and the arc is cooled. Therefore, it can be applied even when the arc driving force of the arc extinguishing plate or the like is weak.

In the switch according to the nineteenth aspect of the present invention, the opening portion of the fixed contact has one opening portion by connecting the first opening portion of the rising portion and the second opening portion facing the contact plate. As a result, the path for branching and flowing to the connecting conductors on both sides of the opening is long, and therefore the force for pushing back the arc is weakened accordingly, so that a large amount of pyrolysis gas of the arc cooling member is generated and the arc is cooled. Therefore, it can be applied even when the arc driving force of the arc extinguishing plate or the like is weak.

In the switch according to the invention of claim 20, the current flowing through the connecting conductor portions on both sides of the first opening when the current is cut off is shunted to both sides, so that the relative distance to the arc becomes large, and this current The electromagnetic repulsive force applied to the arc by is reduced. A magnetic arc runner that covers both sides of the contact plate and the connection conductors on the terminal side shields the electromagnetic force driving in the opposite direction so as to push back the arc due to the current flowing through the connection conductor below the contact plate to the contact side. Further, the electric current flowing through the contact plate acts as an electromagnetic force that drives the arc toward the first opening,
Due to these electromagnetic forces, the arc and the arc spot are strongly extended and driven toward the first opening. In addition, the arc repels the left and right conductors on both sides of the first opening so that the arc does not spread to the left or right and extends straight into the first opening, and the arc spot on the fixed contact also drives on the central axis of the arc runner. Easy to reach the tip of the runner. Therefore, the arc is strongly pressed against the arc cooling member such as the base in the first opening and is cooled by a large amount of pyrolysis gas from the base.

In the switch according to the twenty-first aspect of the present invention, the tip of the arc runner is prevented from coming into contact with the connecting conductor portion, so that the current flowing through the arc runner causes the arc to flow through the arc first.
Of the arc cooling member, so that a large amount of pyrolysis gas of the arc cooling member is generated to cool the arc.

In the switch according to the invention of claim 22, a part of the arc runner is inserted between the contact plate and the connecting conductor portion facing the contact plate, so that the connecting conductor portion below the contact plate is Shields the magnetic field generated by the flowing current and suppresses the force that pushes back the arc. Therefore, the arc is pressed against the arc cooling member in the first opening, and since the arc spot is near the arc cooling member such as the base in the first opening, a large amount of pyrolysis gas from the arc cooling member is generated. Receive cooling by.

In the switch according to the twenty-third aspect of the present invention, since the tip of the arc runner is inserted into the first opening of the rising portion of the connecting conductor, the arc spot on the fixed contact side and The distance to the arc cooling member in the opening of No. 1 can be made smaller, and the action of cooling the arc is further improved, so that the arc voltage can be further increased.

In the switch according to the twenty-fourth aspect of the present invention, the current of the folded contact plate acts so as to press the arc toward the arc cooling member of the first opening, and the connecting conductors on both sides of the second opening. The current of the part acts to push back the arc, but it is shielded by the arc runner to weaken the push back force of the arc, and the arc runner is attached to the connection conductor part near the connection between the contact plate and the connection conductor part. , Since the parts other than this mounting part are not in electrical contact with the connecting conductor part, the current flowing through the arc runner at the time of interruption acts to press the arc against the arc cooling member of the first opening, and further, the tip of the arc runner. Since the part is inserted in the first opening, the distance between the arc spot on the fixed contact side and the arc cooling member in the first opening can be made smaller, and the arc Effect of cooling is further improved. Further, even when the arc spot jumps to the arc runner, a driving magnetic field can be generated, the arc easily extends in the direction of the first opening, and the arc spot is easily driven into the first opening. It is strongly cooled by a large amount of pyrolysis gas from the members.

A switch according to a twenty-fifth aspect of the present invention is formed by the center of gravity of each of the cross sections of the left and right connecting conductors on both sides of the second opening below the contact plate and the center of the fixed contact surface. If the base angle is less than 45 degrees in a two-sided triangle, the effect of the electromagnetic force that pushes back the arc can be reduced, and the force that pushes the arc against the arc cooling member at the first opening can be increased. Since the action of cooling the arc is further improved, the arc voltage can be further increased.

In the switch according to the twenty-sixth aspect of the invention, since the shortest distance between the tip of the movable contact and the arc runner is made shorter than the shortest distance between the tip of the movable contact and the connecting conductor, the arc is other than the arc runner. Since it is possible to prevent the commutation to the fixed contact portion of and to maintain the electromagnetic force for extending the arc, it is difficult to cause the failure of interruption.

In the switch according to the twenty-seventh aspect of the present invention, the current of the folded contact plate acts so as to extend the arc toward the terminal portion, and the connection conductors on both sides of the second opening of the connecting conductor portion below the contact plate are connected. The current of the conductor acts to push back the arc, but since the connecting conductor is below the turnaround and there is a second opening, the connecting conductors on both sides of the second opening are outside the center, so that the relative to the arc. The distance increases and the force that pushes back the arc decreases. Furthermore, it is an isosceles triangle formed from the respective center of gravity of the cross sections of the left and right connecting conductors on both sides of the second opening below the contact plate and the center point of the fixed contact surface, the base angle of which is 45 degrees. Since it is set to be less than, the influence of the magnetic field that pushes back the arc can be reduced, and the force that presses the arc on the arc cooling member of the first opening can be strengthened, so that the action of cooling the arc is further improved. The arc voltage can be increased.

In the switch according to the twenty-eighth aspect of the invention, since the insulator is inserted at least between the contact plate and the connecting conductor portion in the vicinity of the second opening, the current is cut off from the fixed contact to the connecting conductor portion. The arc does not fly, the arc is cooled by the thermal decomposition gas of the insulator, and the arc voltage can be increased.

[0080]

【Example】

Example 1. Hereinafter, one embodiment of claims 1 and 2 of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway view of a circuit breaker as a switch according to this embodiment.
The same or corresponding parts as those of 9 are designated by the same reference numerals, and duplicate description will be omitted. FIG. 1A is a front view and FIG. 1B is a side view.

In the figure, reference numeral 20 denotes a kerf provided on the fixed contactor 4, and the kerf 20 is provided along a surface on which the movable contactor 1 rotates during the opening / closing operation. More specifically, the cut groove 20 is provided substantially on the center line of the connection conductor 7 that electrically connects the terminal portion 6 and the fixed contact 3, and a conductive path is arranged on the left and right of the cut groove 20. . The fixed contactor 4 having the kerf 20 is provided in the container 14
Is held by a base 15 which is a part of the movable contact 2, and a portion of the base 15 located behind the fixed contact 4 as viewed from the contact surface of the movable contact 2 is exposed by the kerf 20.

The arc-extinguishing plate 8 shown in FIG. 1 is provided with a notch so as not to interfere with the rotation of the movable contact 1. It should be noted that although the mechanism section and the current detection section are not shown in FIG. 1, they are naturally contained in the container 14. 2A is a simplified front view showing the positional relationship among the movable contact 1, the fixed contact 4 and the kerf 20 of FIG. 1, and FIG. 2B is the movable contact 1, fixed contact 4 FIG. 6 is a simplified side view showing the positional relationship between the kerf 20 and the base 15. FIG. 2 shows a state where the fixed contact 3 and the movable contact 2 are in contact with each other. FIG. 3 is a perspective view of the fixed contactor 4 of FIG. 1, in which the cut groove 20 extends downward from the terminal portion 6 and is provided in the connection conductor 7, and the connection conductors 7 a are formed on the left and right of the cut groove 20. There is.

Next, the operation will be described. When a relatively small fault current such as an overload current is cut off, the fault current is detected by the current detection unit (not shown) and the mechanism unit (not shown) is detected.
Is operated to rotate the movable contactor 1 to open the contact. When a large current such as a short-circuit current is cut off, the movable contactor 1 is rotated by the electromagnetic repulsive force between the contacts without waiting for the operation of the mechanism section,
The contact opens. It is the same as the conventional case that an arc is generated between the contacts when the contacts are separated.

The arc generated between the contacts is generated by the movable contact 1
It is extended in the direction of the terminal portion 6 by the magnetic driving force due to the current flowing through it and the magnetic driving force due to the arc-extinguishing plate 8 of a horseshoe-shaped magnetic material. At this time, if the cut groove 20 is not provided in the connection conductor 7a forming a part of the connection conductor 7, the current flowing through the connection conductor 7a and the arc repel strongly, and the arc is pushed back between the contacts. However, since the connection conductor 7a is provided with the kerf 20, the current arc for generating the force for pushing back the arc is displaced to the left and right from the direction in which it is stretched, and the force for pushing back the arc is relatively small.

This will be described in more detail. Figure 4
As shown in FIG. 4A, when the orthogonal coordinate system is defined with the center of the kerf 20 as the origin, the conductors on the left and right of the kerf 20 are expressed as shown in FIG. 4B. Here, the currents flowing in the left and right conductors arranged in parallel at the distance 2a are concentrated on the center line of the conductor cross section, and if the lengths of the left and right conductors are approximated to be sufficiently long, the point PO on the z-axis is The magnetic field component that drives the arc at (z) is expressed as: By = (μI / 4πa) sin (2θ) However, the range of θ is −90 ° <θ <90 °, and μ is magnetic permeability and current I = I1 + I2.

Here, from the relation of z = a · tan θ, z
When the driving magnetic field strength on the axis is obtained, the curve B in the graph of FIG. For comparison, a similar coordinate system is defined as shown in FIG. 4 (d) for the case of the fixed contactor 4 of FIG. 4 (c) in which no kerf is provided, and the current is concentrated on the center line of the conductor cross section. And the length of the conductor is long enough,
The magnetic field component driving the arc at the point PO (z) on the z-axis is expressed as follows. By = μI / 2πz

A graph of this relationship is also shown in FIG.
It becomes like the curve D of (e). In the figure, when the magnetic field intensity By is positive, the arc receives an electromagnetic force from the fixed contact 3 to the terminal portion 6 side. The arc has a fixed contact 3 and a connecting conductor 7a.
, The magnetic field strength By has a negative value, and the magnetic field created by the current flowing through the connecting conductor 7a generates a force that pushes the arc back to the fixed contact 3 side. As is apparent from the comparison between the curve B and the curve D of FIG.
It can be seen that the force of pushing back to the side is smaller when the kerf 20 is provided.

When the interruption operation proceeds and the arc is further extended, the state shown in FIG. 5 is obtained. In the figure, A indicates an arc. In this state, the extended arc A
As a result, the base 15 which is a substance other than the conductive path exposed from the kerf 20 is exposed and vapor of the base material is generated. This vapor cools the arc A and raises the arc voltage, so that the current is rapidly limited.

Further, as can be seen from FIG. 4 (e), since the force that pushes back the arc due to the current flowing through the connecting conductor 7a does not act on the arc that has entered the kerf 20, the arc should maintain the state of FIG. You can Furthermore, since the connecting conductors 7a are located on the left and right sides of the kerf 20, the arc is struck by the kerf 2
The left and right connecting conductors 7a are shifted from the center line of 0 to the left and right.
Approaching, the arc is pushed back to the center line by the electromagnetic repulsive force due to the current flowing through the left and right connecting conductors. Therefore, the arc is stably cooled by the base steam.

As described above, with a simple structure in which the cut groove 20 is provided in the connection conductor 7, it is possible to enhance the cooling action when the current is cut off and increase the arc voltage, thereby realizing excellent current limiting cutoff performance. In this embodiment, the base 15 acts as a cooling member for the arc, but even if the base is not inside the cut groove 20, the current is shunted by the connecting conductors 7a on both sides of the cut groove 20. Therefore, the force to push back against the arc at the time of interruption is reduced, the arc is stretched and the arc voltage is improved, and the arc is extinguished by the arc extinguishing plate.
Therefore, it is effective even when there is no arc cooling member such as the base.

Example 2. FIG. 6 is a perspective view of a fixed contactor 4 according to another embodiment of the first and second aspects of the invention. The kerf 20 according to this embodiment is provided across the bent portion of the fixed contactor 4. Providing the cut groove 20 in the bent portion in this way simplifies the bending process. In addition, FIG.
The kerf 20 in the order of (c), FIG.
In the fixed contactor structure as shown in FIG. 6, the longer the kerf 20, the smaller the force for pushing back the arc to the fixed contact 3 side due to the current flowing through the fixed contactor 4.

Example 3. FIG. 7 is a side view of an essential part of a circuit breaker according to another embodiment of the invention of claims 1 and 2. The connecting conductor 7 according to this embodiment includes a connecting conductor 7a, a connecting conductor 7b, and a contact side connecting conductor 7c,
One end is connected to the contact plate 5 to which the fixed contact 3 is fixed, and the other end is connected to the terminal portion 6. The connection conductor 7b is arranged below the position of the contact plate 5. FIG. 8 is a perspective view of the fixed contactor 4, and the cut groove 20 is provided on the center line of the connection conductor 7a.

The current Ib flowing through the connection conductor 7b is a current component that generates a force to push the arc A back to the contact side.
Therefore, when the connecting conductor 7b is provided below the contact plate 5 as described above, the current Ib becomes far from the arc, so that the force for pushing back the arc A becomes smaller and the arc A is exposed from the kerf 20. Because it hits more strongly, the current limiting performance is further improved.

Example 4. FIG. 9 is a perspective view of a main part of a circuit breaker according to another embodiment of the invention of claims 1 and 2. In the base 15 according to this embodiment, the central portion of the portion of the base 15 exposed from the kerf 20 is provided with a constricted portion 15a which is constricted in a V shape on the terminal portion 6 side. If the arc is squeezed like the constricted portion 15a, even if the arc is swayed to the left or right when the arc is stretched to the vicinity of the base portion, the arc will be on the center line due to the pressure of the steam emitted from the base. Stay Therefore,
Since the deterioration of the surface of the parts such as the arc-extinguishing plate (not shown) due to the arc is reduced, the interruption failure such as the re-ignition due to the deterioration of the surface resistance is eliminated.

Example 5. FIG. 10 is a side view of the essential parts of a circuit breaker according to another embodiment of the first and second aspects of the invention. The base 15 according to this embodiment is provided with a pleated portion 15b in which a portion of the base 15 exposed from the kerf 20 is laterally pleated. With this pleated portion 15b, the base 1 in which the arc is exposed from the kerf 20 is formed.
When pressed against the portion of No. 5, the arc stays in the vicinity of the tip of the fold, so that the vicinity of the root of the fold hardly carbonizes. Therefore, deterioration of the creeping resistance of the base 15 in the vertical direction can be prevented, and interruption failure such as re-ignition due to deterioration of the creeping resistance is eliminated. Further, since the area of the base 15 in contact with the arc is increased by making the base surface pleated, the effect of cooling the arc is increased and the current limiting performance is improved.

Example 6. FIG. 11 is a side view of the essential part of a circuit breaker according to another embodiment of the first and second aspects of the invention. In the figure, between the kerf 20 and the base 15, there is provided a cooling plate 23 made of a substance that, when exposed to the arc, produces a vapor that cools the arc.

If the cooling plate 23 is provided between the kerf 20 and the base 15 as described above, the arc can be cooled by a substance that generates steam having an arc cooling effect larger than that of the base material. Will be improved. Further, when the arc A is directly exposed to the base 15, the exposed surface is carbonized and the creeping resistance is lowered. When interrupting a high voltage circuit, the reduction of the creeping resistance may cause re-ignition. Therefore, if the cooling plate 23 is made of a material whose creeping resistance does not easily decrease even when exposed to the arc, such re-ignition can be prevented.

The cooling plate 23 is made of polymethylpentene, nylon, polypropylene, melamine resin or the like, or those resins mixed with magnesium hydroxide, aluminum hydroxide or the like. In addition, as the material whose creeping resistance does not easily decrease even after exposure to an arc, a polymer material containing no benzene ring or having a small proportion thereof in the molecular structure is used. The base material is phenol resin,
For example, a resin having high mechanical strength such as unsaturated polyester filled with a reinforcing fiber such as glass fiber is used.

Example 7. 12 (a), 12 (b),
12 (c) and 12 (d) are perspective views of a cooling plate 23 according to another embodiment of the present invention. In the figure, the unevenness to which the arc of the cooling plate 23 is exposed is provided.
If the cooling plate 23 is provided with irregularities in this way, the area exposed to the arc increases, so that the amount of steam that cools the arc increases and the arc voltage further increases. In addition, FIG.
As shown in FIGS. 12A and 12B, if the cooling plate 23 is provided with a groove in the horizontal direction, the creeping resistance in the vertical direction increases, so that re-ignition can be prevented.

Example 8. FIG. 13 is a perspective view of a laminated cooling plate 24 according to another embodiment of the present invention.
The figure shows a laminated cooling plate 24 in which a substance 24a having a large arc cooling effect and a substance 24b having a high creeping resistance even after the arc exposure are alternately laminated. The laminated cooling plate 24 is laminated so that the substance 24a having a large arc cooling effect is projected. When two substances are laminated in this way,
The substance that has a large effect of cooling the arc is effectively cooled. Furthermore, even after exposure to the retracted arc, the creeping resistance in the vertical direction can be maintained by the substance 24b having a high creeping resistance, and re-ignition can be prevented.

Example 9. FIG. 14 is a side view of a main part of a circuit breaker according to an embodiment of the invention of claim 3, and FIG. 15 is a perspective view of the fixed contactor 4 of FIG. 14 and 15, an arc runner 21 extending from the vicinity of the fixed contact 3 toward the kerf 20 is provided, and the kerf 20 is connected to the connecting conductor 7.
It is provided in a. The material of the arc runner 21 is a metal such as iron, copper, or tungsten, or a material obtained by plating them with chromium, tin, or the like.

As shown in FIG. 14, the arc runner 21
When the arc is provided, the arc A generated between the contacts at the same time as the opening is run through the arc runner 21 and reaches the tip of the arc runner. Therefore, by providing the arc runner 21, the distance between the arc spot on the movable contact side and the portion of the base 15 exposed from the kerf 20 becomes closer. Therefore, since the length of the arc A that touches the base becomes long, the action of cooling the arc is increased and the current limiting performance is improved. Further, when the arc current increases, the blowing force of the metal vapor from the arc spot increases, and it may be difficult to sufficiently extend the arc by the action of the magnetic field. Even in such a case, if the arc runner 21 is provided, the arc spot itself approaches the base 15, so that the function of cooling the arc by the vapor of the base 15 can be maintained even if the arc A is not sufficiently stretched.

Example 10. 16A is a perspective view of a fixed contact according to another embodiment of the invention of claim 3, FIG.
FIG. 16B is a sectional view taken along the section S of FIG.
The arc runner 21 in the figure is formed by stamping out the connecting conductor 7b. When the arc runner 21 is created by stamping in this way, no separate parts are required,
Manufacturing cost is reduced.

Example 11. FIG. 17 is a side view of an essential part of a circuit breaker according to an embodiment of the invention of claim 4, and FIG. 18 is a perspective view of the fixed contactor 4 of FIG. 17 and 18, the fixed contactor 4 in which the connecting conductor 7b is located below the contact plate 5 is used, and the end of the arc runner 21 on the kerf 20 side is bent downward.

FIG. 19 shows the appearance of the arc when the arc is generated between the opposing electrodes in the magnetic field. When the current is small, the Lorentz force extends the arc A to the right. However, when the arc current increases and the current density of the arc spot exceeds a certain value, the ejection of metal vapor from the electrode surface increases rapidly, and the arc A moves in the direction perpendicular to the electrode surface regardless of the presence or absence of a magnetic field. It is formed. This indicates that it is difficult for a high current arc to stretch the arc due to the action of the magnetic field.

Therefore, as shown in FIG. 17, the end of the arc runner 21 on the kerf 20 side is bent downward, and the blowing direction of the metal vapor from the arc spot moved to the tip of the arc runner 21 (indicated by an arrow in the figure). ) Is shown in FIG.
With the direction, the arc A can be pressed against the base 15 exposed from the kerf 20, even in the case of a large current arc in which it is difficult to extend the arc due to the magnetic field. Further, since the arc blowing force becomes stronger as the current increases, the arc A is strongly pressed against the base 15 and the cooling action increases as the large current is interrupted. Therefore, as the large current is interrupted, the cooling effect of the arc is increased and the current limiting interrupting performance is improved.

Example 12. 20 is a side view of an essential part of a circuit breaker according to another embodiment of the invention of claim 4, and FIG. 21 is a perspective view of the fixed contactor 4 of FIG. The connection conductor 7 according to this embodiment is composed of a connection conductor 7a and a connection conductor 7b, and one end of the connection plate 5 has a fixed contact 3 fixed thereto.
The other ends are connected to the terminal portions 6, respectively. The contact plate 5 is connected so as to be folded back from the connection conductor 7b, and a current Id in a direction opposite to the current Ib of the connection conductor 7b flows through the contact plate 5. The arc runner 21 is connected to the tip of the contact plate 5 connected so as to be folded back, and the end of the arc runner 21 on the kerf 20 side is bent downward.

As described above, when the contact plate 5 is provided so as to generate the magnetic field for driving the arc to the terminal side, the arc quickly flows from the fixed contact 3 to the arc runner 21 in the region where the current is relatively small in the initial stage of opening. After the transfer, the arc can be extended to the terminal portion 6 side even after that. Further, even if the arc current value increases and the blowing of metal vapor increases, the tip end of the arc runner is bent downward, so the metallic vapor blows from the kerf 20 toward the base 15 exposed. The arc is strongly pressed against the base. Therefore, the function of cooling the arc by the base vapor can be maintained in any region from a small current to a large current, and excellent current limiting interruption performance can be exhibited.

Example 13. 22 and 23 are perspective views of a fixed contactor 4 according to another embodiment of the present invention.
FIG. 22 shows the fixed contactor 4 having substantially the same shape as that of FIG. 18 and FIG. 23, respectively. However, FIG.
The arc runner 21 shown in FIG. 2 and FIG. 23 is made by cutting. When the arc runner 21 is cut out as described above, another part is not required and the manufacturing cost is reduced.

Example 14 FIG. 24 is a perspective view of a fixed contactor 4 according to another embodiment of the invention of claim 4. The arc runner 21 extends in the kerf 20 direction from the vicinity of the kerf 20 side of the fixed contact 3. The arc runner 21 is bent upward on the way, and the end of the arc runner 21 is bent downward near the kerf 20. Therefore, the arc runner 21 has a convex shape when viewed from the side.

Since the movable contact 1 (not shown) is opened upward, it is preferable to extend the arc runner 21 upward so that the distance between the movable contact 1 and the arc runner 21 during opening is reduced. Therefore, the arc is more easily transferred to the arc runner than when the arc runner is straightened without bending. Therefore, when the arc runner 21 is bent upward in the middle as described above, the arc is quickly transferred from the fixed contact 3 to the arc runner 21 in the initial opening stage, and the arc runner 2 is quickly moved.
1 can be made to travel to the tip.

Further, even if the arc current value increases and the blowing of metal vapor increases, the tip of the arc runner 21 is bent downward, so the metal vapor is exposed from the kerf 20 to the base 15. Since it blows out in the direction (not shown), the arc is strongly pressed against the base 15. Also,
When the current increases and the current density of the arc exceeds a certain value, the arc spot tends to widen as the current increases. However, since the arc runner 21 has a convex shape when viewed from the side, the convex portion suppresses the arc spot from spreading to the fixed contact 3 side. For this reason, the action of cooling the arc by the base steam can be effectively utilized even when a larger current is cut off, and an excellent current limiting cutoff performance can be exhibited.

Example 15. FIG. 25 is a side view of the essential part of the circuit breaker of the fifth embodiment of the invention, and FIG. 26 is a perspective view of the fixed contactor 4 of FIG. In FIG. 25, an arc runner 21 extending obliquely upward from the vicinity of the fixed contact 3 toward the cut groove 20 is provided, and the cut groove 20 is provided in the connection conductor 7a. The shortest distance r1 between the tip of the movable contact 1 and the arc runner 21 is the terminal portion 6 and the fixed contact 3
It is arranged so as to be smaller than the shortest distance r2 between the connecting conductor 7 for connecting and the tip of the movable contact 1. 27 shows a modification of the fixed contactor 4.

As shown in FIG. 25, the arc runner 21
When the arc is provided, the arc generated between the contacts at the same time as the contact opening runs through the arc runner 21 and reaches the tip of the arc runner. Since the arc diameter increases as the arc current increases, the base exposed from the kerf 20 is exposed to the arc to generate steam and cool the arc. At this time, if the connecting conductor 7 is closer to the tip of the movable contactor 1 than the arc runner 21, the arc will be commutated to the connecting conductor 7, and the electromagnetic force for extending the arc will be drastically reduced, which may cause interruption failure. Therefore, as shown in FIG. 25, by making the arc runner 21 closer to the tip of the movable contact 1 than the connecting conductor 7 to prevent the commutation, the reliability of the breaking performance can be improved.

Example 16. FIG. 28 is a perspective view of the fixed contactor 4 of an embodiment of the invention of claim 6. In the figure, an arc runner 21 extending from the vicinity of the fixed contact 3 toward the kerf 20 is provided. The tip of the arc runner 21 is narrower than the width of the kerf 20. 28 (a) and FIG.
In FIG. 28C, the arc runner 21 whose width on the fixed contact 3 side is wider than that on the kerf 20 side is shown in FIG.
Arc runner 21 having the same width on the side and the width on the kerf 20 side
Are shown respectively.

When the width of the tip of the arc runner 21 is made narrower than the width of the kerf 20 in this way, the arc runner 2
The arc that has traveled to the tip portion of the No. 1 gathers at the center of the kerf 20, so that the base 1 exposed from the kerf 20
5 (not shown) can be effectively touched, a stable arc cooling action can be obtained, and excellent current limiting interruption performance can be realized.

By the way, in the fixed contactor 4 of FIG. 28C, the arc runner 21 extending obliquely upward from the vicinity of the fixed contact 3 toward the kerf 20 is provided. The tip of the arc runner 21 is narrower than the width of the kerf 20.
Since the movable contact 1 (not shown) is opened upward, it is better to extend the arc runner 21 upward so that the distance between the movable contact 1 and the arc runner 21 during the opening can be kept small and the arc runner 21 can be kept small. It is easier for the arc to commutate to the arc runner than when straightened without bending.

That is, as shown in FIG. 28C, the kerf 2
When the arc runner 21 extending obliquely upward toward 0 is provided, the arc can be quickly transferred from the fixed contact 3 to the arc runner 21 in the initial opening stage. Further, even if the current of the arc increases and the arc diameter increases, the tip of the arc runner 21 is above the fixed contact 3, so that the arc spot is prevented from returning to the fixed contact 3 and the arc is prevented. It can be stopped at the tip of the arc runner 21. Further, since the width of the tip of the arc runner 21 is made narrower than the width of the kerf 20, the arcs traveling to the tip of the arc runner gather at the center of the kerf 20 and are therefore exposed from the kerf 20. The contacting base 15 (not shown) can be effectively touched, a more stable arc cooling action can be obtained, and excellent current limiting interruption performance can be realized.

Example 17 FIG. 29 is a perspective view of a fixed contactor 4 according to another embodiment of the invention of claim 6. In the figure,
An arc runner 21 extending from the vicinity of the fixed contact 3 toward the kerf 20 is provided. The tip of the arc runner 21 is narrower than the width of the kerf 20. Also, FIG.
In (a), the thickness of the end portion of the arc runner 21 on the kerf 20 side is made thicker than the thickness of the end portion on the fixed contact 3 side. Figure 2
9B, the end of the arc runner 21 on the kerf 20 side is folded back.

When the width of the tip end portion of the arc runner 21 is made narrower than the width of the kerf 20 in this way, the arc runner 2
The arc that has traveled to the tip portion of the No. 1 gathers at the center of the kerf 20, so that the base 1 exposed from the kerf 20
5 (not shown) can be effectively touched, a stable arc cooling action can be obtained, and excellent current limiting interruption performance can be realized.

Further, in FIG. 29, since the thickness of the tip portion of the arc runner 21 is made thicker or folded back to increase the volume of the tip portion of the arc runner 21, a frequent interruption operation is performed. Even Ark Runner 21
Is not consumed so much that the interruption performance is not likely to be deteriorated by the frequent interruption operation.

Example 18. FIG. 30 is a side view of an essential part of a circuit breaker according to an embodiment of the invention of claim 7. In the figure, an arc runner 21 extending from the vicinity of the fixed contact 3 toward the cut groove 20 is provided, and the tip end portion of the arc runner is put in the cut groove 20. In this way, Ark Runner 21
When the tip of the arc is inserted into the kerf 20, the arc spot of the arc A generated at the same time as the opening is moved to the tip of the arc runner 21 and exposed from the arc spot and the kerf 20. The distance to the existing base 15 can be made smaller and the arc A touching the base 15
Will be longer. Therefore, the function of cooling the arc is further improved, the arc voltage is increased, and more excellent current limiting interruption performance is obtained.

Example 19. FIG. 31 is a side view of a main part of a circuit breaker according to another embodiment of the invention of claim 7. In the drawing, an arc runner 21 extending obliquely upward from the vicinity of the fixed contact 3 toward the kerf 20 is provided, and the tip end portion of the arc runner is put in the kerf 20. 32 is the same as FIG.
It is a modification of No. 1.

As described above, by providing the arc runner 21 extending obliquely upward toward the kerf 20, the arc A can be quickly transferred from the fixed contact 3 to the arc runner 21 at the initial opening stage. Further, even if the arc current increases and the arc diameter increases, the tip of the arc runner 21 is located above the fixed contact 3, so that the arc spot is prevented from returning to the fixed contact 3 and the arc A is prevented. It can be stopped at the tip of the arc runner 21. Furthermore, since the tip of the arc runner 21 is inserted in the kerf 20, the distance between the arc spot on the fixed contact 4 side that has moved to the tip of the arc runner and the base 15 exposed from the kerf 20 is small. Since the length of the arc A that comes close to the base 15 is increased, the function of cooling the arc is further improved, and more excellent current limiting interruption performance is obtained.

Example 20. FIG. 33 is a side view of an essential part of a circuit breaker according to another embodiment of the invention of claim 7. Figure 3
3, the fixed contactor 4 in which the connecting conductor 7b is located lower than the contact plate 5 is used, and the kerf 2 of the arc runner 21 is used.
The end on the 0 side is bent downward, and the tip of the arc runner 21 is put in the kerf 20. The movable contact 1 is in a closed state.

When the tip of the arc runner 21 is inserted into the kerf 20 in this manner, the arc spot on the fixed contact 4 side moves to the tip of the arc runner 21 and is exposed from the arc spot and the kerf 20. Base 15
And the arc that touches the base 15 becomes longer. Therefore, the action of cooling the arc is further improved, and the arc voltage is increased. Further, even if the arc current increases, since the end of the arc runner 21 on the kerf 20 side is bent downward, the direction of the metal vapor blown out from the arc spot moved to the tip of the arc runner 21 is kerf 20. The larger the amount of the metal vapor blown out from the arc spot, the more the arc is pressed against the base 15 exposed from the kerf 20. Therefore, the larger the current is cut off, the more the cooling action of the arc is increased, and the current limiting cutoff performance is increased. Is improved.

Example 21. FIG. 34 is a side view of an essential part of a circuit breaker according to another embodiment of the invention of claim 7. The connection conductor 7 according to this embodiment includes connection conductors 7a and 7a.
The contact plate 5 has one end connected to the fixed contact 3 and the other end is connected to the terminal portion 6. The contact plate 5 is connected so as to be folded back from the connection conductor 7b, and a current Id in a direction opposite to the current Ib of the connection conductor 7b flows through the contact plate 5. The arc runner 21 is connected to the tip of the contact plate 5 that is connected so as to be folded back. The end of the arc runner 21 on the kerf 20 side is bent downward to cut the tip of the arc runner 21. It is put in the groove 20.

When the tip of the arc runner 21 is inserted into the kerf 20 in this way, the arc spot on the fixed contactor 4 side of the arc generated at the same time as the opening of the arc is generated by the arc runner 2.
1, the distance between the arc spot and the base 15 exposed from the kerf 20 becomes smaller, and the length of the arc touching the base 15 becomes longer. Therefore, the action of cooling the arc is further improved, and the arc voltage is increased. Further, since the contact plate 5 is connected so as to generate a magnetic field for driving the arc to the terminal portion 6 side, the arc is quickly transferred from the fixed contact 3 to the arc runner 21 in the region where the current is relatively small in the initial stage of opening. After that, the arc can be extended to the terminal portion 6 side.

Even if the arc current value increases and the amount of metal vapor blown out increases, the tip of the arc runner 21 is bent downward, so the metal vapor is exposed from the kerf 20. The arc is urged against the base 15 in a direction. Therefore, in any region from a small current to a large current, the action of cooling the arc by the steam from the base can be maintained, and excellent current limiting interruption performance can be exhibited.

Example 22. FIG. 35 is a simplified diagram of a main part of a circuit breaker according to an embodiment of the present invention.
FIG. 35A is a front view and FIG. 35B is a side view. In the drawing, an arc runner 21 extending obliquely upward from the vicinity of the fixed contact 3 toward the kerf 20 is provided, and the tip end portion of the arc runner is put in the kerf 20. Furthermore, the cross-sectional area of the portion of the arc runner 21 on the fixed contact 3 side is made larger than the cross-sectional area of the tip end portion (end portion on the kerf 20 side) of the arc runner 21.

In order to insert the tip of the arc runner 21 into the kerf 20 in order to improve the effect of cooling the arc, it is necessary to make the width of the tip of the arc runner 21 smaller than the width of the kerf 20. However, when the arc runner having a narrow width is used, the heat capacity of the arc runner becomes small, and the arc runner may be melted and blown when the interruption operation is repeated. Therefore, as shown in FIG. 35, when the cross-sectional area of the portion of the arc runner 21 on the fixed contact 3 side is made larger than the cross-sectional area of the tip portion (end portion on the kerf 20 side) to increase the heat capacity of the arc runner, the arc runner It is possible to reduce the consumption and prevent the interruption performance from being deteriorated in frequent interruption operations.

Example 23. 36 is a simplified view of the essential parts of a circuit breaker according to an embodiment of the present invention.
FIG. 36A is a front view and FIG. 36B is a side view. In the figure, an arc runner 21 extends from the vicinity of the fixed contact 3 toward the kerf 20, and the arc runner penetrates the kerf 20. Base 1 exposed from kerf 20
The portion 5 is at least wider than the width of the arc runner 21, and at least penetrates the arc runner 2.
The length of 1 retreats toward the terminal portion 6 side.

The operation in the case of such a configuration will be described. The arc A, which is generated at the same time as the opening, travels along the arc runner 21 and reaches the tip of the arc runner 21. When the arc A travels over the kerf 20 and reaches the terminal portion 6 side, the current flowing through the connecting conductor 7a is opposite to that before that, and the arc A is exposed from the kerf 20.
A force to push it to the 5 side is generated (see FIG. 4).
Therefore, since the arc A strongly touches the base 15, the action of cooling the arc is increased. Further, when the arc current increases and the arc diameter tends to increase, the arc A cannot spread in the width direction beyond the width Wa of the kerf at the portion crossing the kerf 20, so the arc diameter is limited.
Therefore, the current density of the arc increases and the arc voltage increases, so that the current limiting interruption performance is further improved.

Example 24. FIG. 37 is a perspective view of an essential part of a circuit breaker according to another embodiment of the ninth aspect of the invention. In the figure, at a portion of the base 15 exposed from the kerf 20, with a width slightly larger than the width of the arc runner 21,
A groove is provided so that the tip of the arc runner 21 can be inserted therein.

With such a structure, the arc reaching the tip of the arc runner 21 enters the groove and is surrounded by the base 15, so that the arc cooling action by the steam generated from the base 15 is further enhanced. improves. Also,
The width of the groove provided in the base 15 restricts the spread of the arc spot on the arc runner side, so that the current density of the arc further increases and the arc voltage further increases. Therefore, the current limiting interruption performance is further improved.

Example 25. FIG. 38 is a front view of the essential parts of a circuit breaker according to another embodiment of the ninth aspect of the invention. Figure 3
FIG. 9 is a side view for explaining FIG. 38. In the figure, a constricted portion 20 a is provided in the middle portion of the kerf 20.

FIG. 39 (a) shows a state in which the electric current is relatively small and the arc diameter is small in the initial stage of opening.
Quickly runs to the tip of the arc runner 21. At this time, the arc A crosses the kerf 20 downward from the narrowed portion 20a in the middle of the kerf. Then, FIG.
When the movable contact 1 further rotates as shown in (b),
The arc crosses the kerf 20 above the waist 20a in the middle. After this, even if the arc current increases and the arc diameter tries to increase, the arc diameter is reduced
0a makes it impossible to spread freely. Therefore,
The current density of the arc increases and the arc voltage increases. That is, with such a configuration, the current limiting performance when the large current is cut off is further improved.

In this embodiment, the constricted portion 20a is provided in the middle of the kerf 20, but the width of the kerf 20 on the side of the fixed contact 3 is set so that the arc having a relatively small arc diameter at the initial stage of contact opening. The same effect can be obtained by making the width of the kerf 20 closer to the terminal 6 than the width of the fixed contact so as not to hinder the running.

Example 26. 40 is a front view of the essential parts of a circuit breaker according to another embodiment of the ninth aspect of the present invention. Figure 4
1 is a side view of FIG. 40. In the figure, the width of the kerf 20 becomes narrower as it approaches the terminal portion 6. Further, the contact plate 5 of the fixed contactor 4 is connected so as to be folded back from the connection conductor 7b so as to generate a magnetic field component that drives the arc toward the terminal portion 6. The arc runner 21 extends from the vicinity of the fixed contact 3 through the cut groove 20 toward the terminal portion 6 side.

As described above, the fixed contact structure for generating a large magnetic field component for driving the arc to the side of the terminal portion 6 and the terminal portion 6
When the kerf 20 whose width becomes narrower toward the side is used at the same time, the arc is pushed into the narrower side of the kerf 20, so that the arc diameter is suppressed from expanding and the current limiting interruption performance is further improved.

Example 27. FIG. 42 is a side view of the essential parts of a circuit breaker according to an embodiment of the present invention. In the figure, an arc runner 21 extends from the vicinity of the fixed contact 3 toward the terminal portion 6, and the arc runner once penetrates the kerf 20, is bent upward there, and pierces the kerf 20 again.

In order to effectively limit the fault current, it is necessary to raise the arc voltage before the current value increases.
Even if the arc voltage is increased after the current has increased, the current cannot be squeezed into a small value, and moreover, the energy injected into the arc increases and the pressure inside the container rises significantly, which may damage the container. is there. Therefore, when the arc runner 21 as shown in FIG. 42 is used, the arc A is in the state of FIG. 42 (a) at the initial stage of contact opening, the distance between the arc A and the base 15 can be reduced, and the arc A can be cooled by the base steam. , To effectively limit the current.

In the latter half of the breaking operation, the arc A runs to the tip of the arc runner 21 and leaves the base 15, as shown in FIG. 42 (b). Therefore, since the amount of steam generated from the base 15 can be reduced in the latter half of the shutoff operation, damage to the container due to an increase in the internal pressure of the container can be prevented.

Example 28. FIG. 43 is a perspective view of the movable contact 1 and the fixed contact 4 according to the embodiment of the invention of claim 11. In the figure, the movable contact 1 is provided with an arc horn 22. 43 (a) shows the arc horn 22 extending straight, FIG. 43 (b) shows the arc horn 22 extending obliquely upward, and FIG. 43 (c) showing the arc horn 22 extending downward.

In this way, the arc horn 22 is attached to the movable contact.
When the arc is formed, the arc spot of the arc generated between the contacts on the movable contact 1 side moves to the tip of the arc horn 22, so that the arc and the base 15 (not shown) exposed from the kerf 20 are provided. Is shortened, the arc cooling action by the vapor from the base 15 is increased, and the current limiting interruption performance is improved.

The material of the arc horn 22 is a material that is not easily consumed by the arc, and is a metal having a higher melting point than copper, silver, etc., such as iron, tungsten, etc.

Example 29. FIG. 44 is a perspective view of a movable contactor 1 according to another embodiment of the invention of claim 11. In the twenty-eighth embodiment, the arc horn 22 is provided to increase the cooling effect of the arc by the base steam, but the effect of the arc horn 22 is small unless the arc spot moves quickly to the tip of the arc horn 22. Therefore, FIG.
As shown in (a), if a groove is provided in a portion of the arc horn 22 opposite to the movable contact 2, a current flows as indicated by an arrow in the figure, and a magnetic field for driving the arc to the tip of the arc horn 22. Occurs. Therefore, the arc can be quickly driven to the tip of the arc horn 22. Figure 44 (a)
Then, although the groove is simply provided, if the substance 22a having a large electric resistance is inserted into the groove portion as shown in FIG. 44B, the mechanical strength can be prevented from lowering due to the groove.

Example 30. FIG. 45 is a perspective view of a movable contactor 1 according to another embodiment of the invention of claim 11. In the twenty-eighth embodiment, the arc horn 22 is provided in order to increase the cooling effect of the arc by the base steam, but if the interruption operation is repeated, the tip end portion of the arc horn 22 is consumed and the current limiting interruption performance deteriorates. Therefore, as shown in FIG.
If the arc horn 22 is connected to a substance that is less likely to be consumed by the arc, it is possible to prevent the current limiting interruption performance from being deteriorated due to the wear of the arc horn 22. Incidentally, in FIG. 45 (a), the arc horn 2 is made by making a fitting and brazing or caulking.
Although the case where 2 is fixed is shown, as shown in FIG.
The arc horn 22 may be screwed and fixed.

Example 31. FIG. 46 is a side view of a main part of a circuit breaker according to an embodiment of the invention of claim 12. In the figure, the tip of an arc horn 22 provided on the movable contact 1 is inserted into the kerf 20. 47 and 48 show modifications of the arc horn. FIG. 47 shows the arc horn 22 extending obliquely upward, and FIG. 48 shows the arc horn 22 extending downward.

As described above, when the tip of the arc horn 22 of the movable contact 1 is made to enter the kerf 20 in the closed state, the arc spot of the arc A generated between the contacts on the side of the movable contact 1 is the arc. It moves to the tip of the horn, and the distance between the arc A and the base 15 exposed from the kerf 20 becomes shorter.
The cooling effect of the arc due to the steam from is increased, and the current limiting interruption performance is further improved.

Example 32. FIG. 49 is a side view of the essential parts of a circuit breaker according to an embodiment of the thirteenth invention. In the figure, the movable contact 1 is provided with an arc horn 22, and the fixed contact 4 is provided with an arc runner 21.

Thus, when the movable contact 1 is provided with the arc horn 22 and the fixed contact 4 is provided with the arc runner 21 at the same time, the arc spot of the arc A generated between the contacts on the side of the movable contact 1 is the arc horn 22. Since the arc horn on the fixed contact 4 side moves to the tip of the arc runner 21, the distance between the arc A and the base 15 exposed from the kerf 20 becomes closer, The cooling action of the arc by the steam from 15 is further increased, and the current limiting interruption performance is further improved.

Example 33. 50 is a side view of the essential parts of a circuit breaker according to another embodiment of the thirteenth invention. In the figure, the movable contact 1 is provided with an arc horn 22 and the fixed contact 4 is provided with an arc runner 21, and the tip of the arc horn 22 is bent obliquely upward and the tip of the arc runner 21 is bent obliquely downward. There is.

As described above, when the distance between the arc horn 22 and the arc runner 21 is increased toward the tip, the arc A generated between the contact points inevitably travels through the arc horn 22 and the arc runner 21. The arc length increases and the arc voltage rises rapidly. Further, even after the arc A reaches the tips of the arc horn 22 and the arc runner 21, even if the arc current becomes large, the direction in which the metal vapor is blown out from the arc horn 22 and the arc runner 21 (indicated by the arrow in FIG. 50). Is in the direction of the kerf 20, the arc A is strongly pressed against the base 15 and the action of cooling the arc is increased. Therefore, excellent current limiting interruption performance can be obtained in all regions from a small current to a large current.

Example 34. 51 is a perspective view of an essential part of a circuit breaker according to another embodiment of the thirteenth aspect of the present invention. In the figure, the movable contact 1 is provided with an arc horn extending downward, and the fixed contact 4 is provided with a horseshoe-shaped arc runner 21 extending from the vicinity of the fixed contact 3 to the kerf 20. In the closed state, the tip of the arc horn 22 is projected inside the horseshoe-shaped arc runner 21, and in the opened state, the tip of the arc horn 22 is positioned above the horseshoe-shaped arc runner 21. ing.

With such a structure, the arc generated between the contacts at the same time as the opening is quickly commutated to the arc horn 22 and the arc runner 21. Therefore, the time during which the arc is stagnant between the contacts is shortened, and the wear of the contacts is reduced. Further, if the horseshoe-shaped arc runner 21 is made of a magnetic material, the magnetic field component that promotes the commutation of the arc increases, and the initial commutation speed becomes faster. The arc commutated to the arc runner 21 travels to the tip of the arc runner 21 and is cooled by the base steam, so that excellent current limiting interruption performance is obtained.

Example 35. 52 is a side view of the essential parts of a circuit breaker according to an embodiment of the fourteenth aspect of the present invention. In the figure, the movable contact 1 is provided with the arc horn 22 and the fixed contact 4 is provided.
Arc runners 21 are provided respectively. In the closed state, the tip of the arc horn 22 and the arc runner 21 are arranged so as to enter the kerf 20.

As described above, the ends of the arc horn 22 and the arc runner 21 in the closed state are provided with the kerf 20.
52, as shown in FIG. 52, since the arc A generated between the contacts at the same time as the contact opening runs through the arc horn 22 and the arc runner 21 and enters the kerf 20, the arc of arc A at the initial contact opening. Most of the length touches the base 15, and the effect of cooling the arc can be further improved, and the arc voltage rises rapidly. Therefore,
The current limiting interruption performance is further improved.

Example 36. FIG. 53 is a side view of the essential parts of a circuit breaker according to an embodiment of the fifteenth aspect of the invention. Figure 5
3 (a) shows the initial state of contact opening, and FIG. 53 (b) shows the latter half of the breaking operation. In the figure, fixed contact 3
An arc runner 21 extending from the vicinity in the direction of the kerf 20 and an arc horn 22 having a tip portion in the kerf 20 in the closed state are provided. Arc runner 21
The tip of the is positioned in front of the kerf 20 so as not to enter the kerf 20. The tip of the arc horn 22 is rotated by the movable contact 1 so that the kerf 20
I try to go out from.

With this structure, the arc A generated between the contacts at the same time when the contacts are opened runs through the arc runner 21 and the arc horn 22 to be in the state shown in FIG. 53 (a). At this time, the arc A touches the base 15 exposed from the kerf 20, is rapidly cooled by the base vapor, and the arc voltage rises quickly. The shutoff operation proceeds,
In the latter half of the breaking operation, the movable contact 1 rotates and the movable contact 1 is rotated as shown in FIG.
The state becomes as shown in (b). In this state, the arc horn 22 moves away from the kerf 20, so that the arc A moves away from the base 15 and the amount of steam generated from the base 15 decreases.

Generally, in order to effectively limit the fault current, it is necessary to raise the arc voltage before the current value increases. Not only can the current be reduced by increasing the arc voltage after the current has increased, but also
The energy injected into the arc increases and the pressure inside the container rises too much, which may damage the container. Therefore, by adopting the above-mentioned configuration, it is possible to quickly raise the arc voltage in the initial stage of opening, and to prevent the pressure inside the container from being generated in the latter half of the breaking operation, thus providing an excellent current limiting cutoff without damage to the container. A switch having performance can be realized.

Example 37. 54 is a plan view of a fixed contact of a circuit breaker according to an embodiment of the sixteenth aspect of the present invention. In FIG. 54, 4 is a fixed contactor, 3 is a fixed contactor 4.
A fixed contact fixed to one end of the fixed contact 6, a terminal portion formed on the other end of the fixed contact 4, a connecting conductor 7 connecting the fixed contact 3 and the terminal portion 6, and a cut portion 20 formed on the connecting conductor 7. Grooves 7a are connection conductors on the left and right of the kerf 20. Three
Reference numeral 1 is an insulator that electrically insulates the connection conductor portion around the cut groove 20. As shown in FIG. 55, which is a sectional view taken along the line AA in FIG. 54, the insulator 31 insulates not only the upper surface of the connection conductor 7 but also the inner surface of the kerf 20.

FIG. 56 is a side view of the electrode portion of the circuit breaker using the fixed contact 4 and shows the closed state. In the figure, 1 is a movable contactor, 1a is a rotation center provided at one end thereof, 2 is a movable contact fixed to one end of the movable contactor 1, and 15 is a base. The arc extinguishing plate and the like are omitted in the figure. As shown in the figure, the tip 32 of the movable contactor 1 faces the cut groove 20 of the connection conductor 7 in the closed state, and the cut groove 20 exposes a portion of the base exposed surface 33 of the base 15.

Next, the operation will be described. FIG. 57 shows when the current is cut off. When the current is cut off, the movable contact 1 is opened by rotating about the rotation center 1a as an axis, and an arc A is generated between the fixed contact 3 and the movable contact 2. Connection conductor 7
Current flowing in the left and right connecting conductors 7a at the kerf 20.
Since the current is shunted to it, the electromagnetic repulsive force against the arc due to the current is reduced, the arc A between contacts tends to extend in the direction of the terminal portion 6, and the electromagnetic repulsive force from the left and right connecting conductors 7a causes the arc to be straight without being biased to the left or right. Extending in the direction of the kerf 20 and touching the exposed base surface 33 of the kerf 20 to the base 1
Since it is cooled by the pyrolysis gas of No. 5, it shows excellent blocking performance. Since these actions are similar to those of the circuit breaker described in the first embodiment, detailed description will be omitted.

Next, the operation when the breaking current is large will be described. In this case as well, it is natural that the above-described action is exerted, but as the current increases, the cross-sectional area of the arc A also increases so as to keep the current density constant, and the diameter of the arc A becomes larger than that of the kerf 20. It can be larger than the width. As a result, the arc A tries to approach the left and right connecting conductors 7a, despite the electromagnetic repulsive force of the left and right connecting conductors 7a.
FIG. 58 shows this state in the AA cross section of FIG. 57. In this embodiment, the left and right connecting conductors 7a are covered with the insulator 31. Therefore, when the diameter of the arc A increases and approaches the left and right connecting conductors 7a, the heat of the arc A causes the insulator covering the left and right connecting conductors 7a to undergo thermal decomposition and release gas.

In FIG. 58, this pyrolysis gas is schematically shown by an arrow. This cracked gas cools the arc in the same manner as the pyrolysis gas of the base described above. Moreover, insulator 3
Cooling the arc A by 1 does not merely cool the arc. As shown in FIG. 58, the arc A is flattened by this cooling, and the left and right widths of the cross section are reduced. Further, this cooling effect works so as to maintain the arc A in the middle without being biased to the left and right, similarly to the electromagnetic repulsive force of the left and right connecting conductors 7a. As a result, even if the diameter of the arc A becomes larger than the width of the kerf 20, the arc A can enter the kerf 20, and the exposed base surface 33 can be sufficiently cooled by the decomposed gas. In addition, the insulator 31 connects the left and right connecting conductors 7
It goes without saying that damage to the connecting conductor 7 around the cut groove 20 such as a by the arc A can be prevented. With the above operation, the circuit breaker of this embodiment can exhibit excellent current limiting interrupting performance even when interrupting a large current.

As the material of the insulator 31, both an organic substance such as plastic and an inorganic substance such as ceramics are effective. In particular, organic substances have a great effect because thermal decomposition gas is easily generated. For example, resins such as polybutylene terephthalate, polyoxine benzylene, polyamide, etc., or glass resins, ceramic fibers, magnesium hydroxide, etc. as a filler are mixed in these resins. There are things.

Example 38. FIG. 59 shows another embodiment of the invention of claim 16. In the above-described embodiment, the conductor portion of the connection conductor 7 in which the kerf 20 is provided is substantially in contact with the exposed surface 33 of the base, but as shown in FIG. 60, which is an AA cross-sectional view of FIGS. 59 and 59. , Kerf 20 and exposed base surface 33
A space 34 is provided between the slits 35, and the slit portion 35 formed by extending the insulating portion inside the kerf 20 of the insulator 31
Even if the narrow space 34 is formed between the kerf 20 and the exposed base surface 33, the same effect as in the above embodiment can be obtained. Further, in this structure, the portion of the arc A between the contacts with respect to the kerf 20 can entirely enter the slit space 34.
The cooling effect by the pyrolysis gas from the narrow gap portion 35 and the base exposed surface 33 is large, and a more excellent blocking performance can be obtained.

Example 39. 61 shows another embodiment of the sixteenth aspect of the present invention. As shown in FIG. 61, for insulating the connecting conductor 7 around the cut groove 20, only the upper surface of the connecting conductor 7 is insulated and the inner surface of the cut groove 20 is The desired effect can be obtained even with a simple structure without insulation. As a modification of this embodiment, as shown in a plan view (a) of the fixed contact and a cross-sectional view (AA) of the fixed contact (b), in order to connect the connection conductor 7 around the kerf 20, the kerf 20 itself is also formed. Even if the insulating material 31 that covers is used, the same effect as that of the 37th embodiment can be obtained.

Example 40. This embodiment has claims 17 and 1.
It is one Example of the invention of 8 and 19. 63 is an electrode portion of the circuit breaker, in which 4 is a fixed contact, 3 is a fixed contact fixed to the contact plate 5, 6 is a terminal portion formed at one end of the fixed contact 4, and the connecting conductor 7 Is connected to the contact plate 5. The other end of the connecting conductor 7 is bent in a substantially U shape and is connected to the contact plate 5, and the other end of the contact plate 5 faces the terminal portion 6. Reference numeral 1 denotes a movable contactor having a movable contact 2 fixed to one end thereof, and a cut groove 20 is provided in a portion of the connecting conductor 7 facing the tip portion 32 of the movable contact 1 at the time of closing. The exposed surface 33 of the base 15 is exposed.

Next, the operation will be described. FIG. 63 shows the arc A generated between the fixed contact 3 and the movable contact 2 when the movable contact 1 is opened when the current is cut off. Connection conductor 7
Current flowing in the left and right connecting conductors 7a at the kerf 20.
Since the electromagnetic repulsive force to the arc due to these currents is reduced and the inter-contact arc A easily extends in the direction of the terminal portion 6, the detailed description thereof will be omitted because it is similar to the circuit breaker of the first embodiment. The electromagnetic repulsive force of the left and right connecting conductors 7 causes the arc to extend straight in the direction of the kerf 20 without being biased to the left or right, and if the base exposed surface 33 of the kerf 20 is touched, the base is cooled by pyrolysis gas. It is similar to the circuit breaker of No. 1.

In this embodiment, as indicated by the arrow in FIG. 63, the current Id flowing through the contact plate 5 among the currents flowing through the fixed contact 4 is substantially antiparallel to the current flowing through the movable contact 1 when closed. . Therefore, the current flowing through the contact plate 5 exerts an electromagnetic force in the direction of the terminal on the arc A between the contacts. Further, the current Ib flowing through the connection conductor portion 7 below the contact plate 5 generates a force for pushing the arc A back to the contact side.
Since the distance to is large, its influence is reduced. As a result, the above-mentioned arc is cut into the base exposed surface 3 of the groove 20.
Since the force for touching 3 becomes extremely large and the arc is cooled by the initial formation of a large amount of pyrolysis gas, a circuit breaker with excellent current limiting interruption performance can be obtained.

FIG. 64 shows a modification of the U-shaped fixed contact of FIG. 63, and FIG. 64 (a) shows a cut groove 36 in the portion of the connecting conductor portion 7 facing the contact plate 5 to which the fixed contact 3 is fixed. Is provided. Then, the connecting conductors 7 on the left and right of the kerf 36
An electric current is shunted to b. Since the shunted current can increase the distance from the arc A, the force for pushing the arc back to the contact side can be decreased.
In FIG. 64 (b), the kerf 20 and the kerf 36 are combined into one kerf, which has the same effect as in FIG. 64 (a).

Example 41. This implementation is claim 17,
It is another embodiment of the invention of 8 and 19. 65 (a) is a side view of the main part of the circuit breaker, and FIG. 65 (b) is a perspective view of the fixed contactor 4. This embodiment is a modification of the 40th embodiment. The connecting conductor 7 according to this embodiment has a kerf 20.
And the left and right connection conductors 7a, the kerf 36 and the left and right connection conductors 7
The contact plate 5 has one end connected to the fixed contact 3 and the other end is connected to the terminal portion 6. The contact plate 5 is connected by brazing so as to be folded back from the left and right connecting conductors 7b, and a current Id in the opposite direction to the current Ib of the left and right connecting conductors 7b flows through the contact plate 5.

As described above, the left and right connecting conductors 7 are attached to the contact plate.
If the current Id in the direction opposite to b and the current Ib is made to flow, the arc A is extended in the direction of the kerf 20 by the current Id. Further, the current Ib that generates a force for pushing the arc back to the contact side can be moved away from the arc A. Therefore, since the arc A hits the base exposed from the kerf 20 more strongly, the current limiting performance is further improved. Figure 6
5 (c) is one in which the kerf 20 and the kerf 36 are formed, and has the same effect as that of FIG. 65 (b).

FIG. 66 is a perspective view of the fixed contactor 4 in which the contact plate 5 is connected so as to be folded back from the left and right connecting conductors 7b, and is manufactured by cutting and bending. By manufacturing by cutting and bending as described above, the parts other than the fixed contact 3 can be formed by one part, and the manufacturing cost can be reduced.

However, in the cutting and bending process, the contact plate 5 cannot be cut out unless the height of the contact plate is designed to be higher than a certain level (at least higher than the plate thickness of the conductor). By connecting the contact plates, the height of any contact plate can be realized. In addition, since the folded-back portion inevitably becomes long in the cutting and bending process or the brazing process, when the length of the fixed contactor 4 is limited, FIGS.
As described above, the method of forming by bending is effective.

In the above-mentioned Examples 40 and 41, the U-shaped, U-shaped or U-shaped folded portion was provided, but the shape is not limited to these, and the current flowing through the fixed contact 4 is folded back and the fixed contact 3 of the fixed contact 3 is folded. The mounting portion may be configured so as to flow in the opposite direction. Example 42 shown below is also constructed for the same purpose.

Example 42. FIG. 67 shows another embodiment of the invention of claim 17. Although the contact plate 5 is fixed to the connection conductor 7 in the above embodiment, the contact plate 5 may have a repulsive structure as shown in FIG. 67. In FIG. 67, the fixed contact 3 is fixed to a contact plate 5 called a repulsion element 5a, and the other end portion of the repulsion element 5a is rotatably attached to the rotary shaft 39.
Supported by. The repulsion element 5a receives a force by the coil spring 40 in the direction in which the fixed contact 3 contacts the movable contact 2. 41 is a fulcrum of the coil spring 40. The terminal portion 6 is connected to the connection conductor 7 having the kerfs 20 as in the above embodiment,
The exposed surface 33 of the base 15 is exposed through the cut groove 20. The connecting conductor 7 and the repulsion element 5a are the rotating shaft 3 of the repulsion element 5a.
The flexible conductors 42 are connected so as not to hinder the rotational movement around the center 9.

FIG. 68 shows the current interruption state of this embodiment. Since electric currents flowing through the repulsion element 5a and the movable contact element 1 are parallel to each other and are in opposite directions at the time of interruption, electromagnetic repulsion forces act on the repulsion element 5a and the movable contact element 1. When this electromagnetic repulsive force becomes larger than the force of the coil spring 40 holding the repulsion 5a, the repulsion 5a rotates about the rotation shaft 39 as shown in the figure. The current flowing through the repulsion element 5a generates a force for pushing the arc in the direction of the kerf 20 as described above, so that the arc spot on the fixed contact is driven to the tip of the repulsion element 5a.

At this time, since the repulsion member 5a repels and rotates, the tip of the repulsion member 5a has a base exposed surface 3 of the kerf 20.
Suitable for 3. Therefore, the arc emitted from the arc spot moved to the tip of the repulsion member 5a is strongly blown to the exposed base surface 33. Therefore, the arc causes the base exposed surface 3 to be affected not only by the action of the electromagnetic force but also by the effect of this spraying.
Since it is pressed against No. 3, more pyrolysis gas is generated from the base, the arc cooling effect is enhanced, and the current limiting interruption performance is improved as compared with the above-mentioned embodiment.

Example 43. FIG. 69 is a perspective view of a fixed contact of a circuit breaker according to an embodiment of the twentieth aspect of the present invention. Here, the fixed contactor 4 is configured by cutting and bending the connection conductor 7 of the contact plate 5 shown in the forty-first embodiment.
In this embodiment, the connecting conductors 7 on both sides of the contact plate 5 and on the terminal portion side are covered with an arc runner 21 made of a magnetic material such as iron. Arc runners 2 on both sides of the contact plate 5
The connection conductors 7 covered with 1 are the left and right connection conductors 7b of the cut groove 36 (shown in FIG. 70) formed by cutting and bending the contact plate 5.

FIG. 70 is a cross section taken along the line AA in FIG. 69, and shows only the cross section for explaining the operation. Terminal 6 is on the back of the page
Direction. If a current flows in from the terminal portion 6 here, the current flowing in the contact plate 5 generates a magnetic field of B1 in the direction opposite to the paper surface. The magnetic field B1 generates an electromagnetic force in the direction of the terminal portion 6 and in the direction opposite to the paper surface with respect to the current indicated by the thick arrow in the arc A. This is as described above. On the other hand, the current flowing through the connecting conductors 7b on the left and right of the kerf 36, which is generated by cutting and bending, is in this direction on the paper surface, and the magnetic field created by this current generates an electromagnetic force that moves the arc A in the direction opposite to the terminal portion 6. However, in this embodiment, the arc runners 21 cover the left and right connecting conductors 7b, and since the arc runners 21 are magnetic bodies, the magnetic field B2 due to the current flowing in the left and right connecting conductors 7b is as shown in FIG. It is shielded by the arc runner 21, which is a magnetic material, and does not hinder the driving of the arc A toward the terminal portion 6.

As a result, as shown in FIG. 71, the arc A receives a strong driving force in the direction of the kerf 20 when the current is cut off, and the arc spot on the fixed contact 3 is also the arc runner 2.
It is easy to be driven by the tip portion 43 of No. 1. It should be noted that the force for driving the arc in the direction of the kerf 20 also contributes to the reduction of the anti-driving (anti-driving magnetic field) by the kerf 20 of the connecting conductor 7, as described in the above embodiment. Furthermore, when there is an arc runner 21 that is wide enough to cover the connecting conductor 7 as in the present embodiment, the arc spot driven by the tip of the arc runner 21 is not always at the center of the arc runner 21. Instead, it is biased left and right.

This is because the circuit breaker is generally used in a three-phase circuit, and since the respective electrode parts are adjacent to each other, the circuit breaker is affected by the electromagnetic force of the current flowing through the adjacent phase. However, in this embodiment, as described in the above embodiment, the kerf 2
The arc A is driven straight without being biased to the left or right by the electromagnetic force from the left and right connecting conductors 7a of 0. Therefore, the arc spot on the arc runner 21 is driven to the center of the tip portion 43 of the arc runner 21. As a result, the arc A is strongly pressed against the exposed base surface 33 of the kerf 20 and cooled by a large amount of pyrolysis gas, so that excellent current limiting interruption performance is obtained.

Example 44. FIG. 72 shows another embodiment of the invention of claim 20. In the above embodiment, the arc runner 21
Although a wide object up to the tip portion 43 of FIG.
As shown in, the width of the tip end portion 43 of the arc runner 21 may be narrower than the width of the kerf 20. By configuring the arc runner 21 in this way, it is easy to maintain the arc spot on the tip end portion 43 of the arc runner 21 at the center. In addition, as a modified example of the present embodiment, FIGS.
As shown in (b), even if the protrusion 44 that is raised higher than other portions is provided in the center of the arc runner 21, it is easy to maintain the arc spot at the center of the arc runner 21.

Example 45. FIG. 74 shows another embodiment of the invention of claim 20. Although the arc runner 21 around the contact plate 5 is lower than the surface of the fixed contact 3 in Example 43, the surface of the fixed contact 3 is lower than that of the surrounding arc runner 21 as shown in FIG. Has the same effect. Furthermore, since the arc runner 21 is higher than the fixed contact 3, there is an effect that the arc spot on the fixed contact 3 easily moves to the arc runner 21.

Example 46. 75 and 76 are claims 21
3 is a side view and a plan view of a fixed contactor of a circuit breaker according to an embodiment of the invention of FIG. Here, in the fixed contactor 4, the contact plate 5 is formed by cutting and bending the connection conductor 7 as in the case of the 43rd embodiment. Similarly, the connecting conductors 7 on both sides of the contact plate 5 and on the terminal portion side are covered with an arc runner 21 made of a magnetic material such as iron. The connecting conductors 7 covered with the arc runners 21 on both sides of the contact plate 5, that is, the connecting conductor portions on both sides of the cut groove 36 formed by cutting and bending are used as the left and right connecting conductors 7b.

Further, in the present embodiment, the tip portion 43 of the arc runner 21 is provided on the connection conductor 7 (on the left side in the drawing) in the direction opposite to the terminal 6 with respect to the fixed contact 3, at least at the side of the fixed contact 3. Connection portions 45 and 46 are provided on the side opposite to and connected to the connection conductor 7. Arc runner 21 from fixed contact 3
At the tip 43 side of the arc runner 2 as shown in the figure
In order to prevent electrical contact between 1 and the connecting conductor 7, the connecting portions 45 and 46 of the arc runner 21 are thicker downward than the other portions so that the tip portion 43 floats.

In FIG. 75, when a current flows in from the terminal portion 6, the arrow indicates the current when the arc spot of the arc A moves to the tip portion 43 of the arc runner by the magnetic driving force described in the above embodiment. . In this embodiment, since the arc runner 21 is connected to the connecting conductor 7 as described above, after the arc spot on the fixed contact 3 moves to the arc runner 21, a current as indicated by an arrow flows through the arc runner 21. to continue. This current has an arc spot with a fixed contact 3
It is in the same direction as the current flowing through the contact plate 5 when it is above, and therefore the electromagnetic force due to this current is the force that drives the arc and arc spot in the direction of the kerf 20. Therefore, even after the arc spot moves to the tip portion 43 of the arc runner, the arc A is driven in the direction of the kerf 20, and as described in the above embodiment, the exposed base surface 33 is cooled by the pyrolysis gas, More excellent blocking performance can be obtained.

In the above embodiment, the connecting portions 45 and 46 of the arc runner 21 are thickened below the other portions so that the arc runner 21 and the connecting conductor 7 do not come into contact with each other on the tip end side 43 side of the arc runner from the fixed contact 3. 77, the tip portion 43 of the arc runner 21 is bent so that the tip portion 43 of the arc runner 21 does not touch the connecting conductor 7 as shown in FIG. 77. Good. It goes without saying that even in this case, the same effect as that of the above-mentioned embodiment can be obtained.

Example 47. FIG. 78 shows another embodiment of the invention of claim 21. This embodiment has the same effect as that of the above-described embodiment 46. In this embodiment, since the arc runner 21 and the connecting conductor 7 are not brought into contact with each other on the tip end side 43 side of the arc runner with respect to the fixed contact 3, As shown in the drawing, the terminal portion 6 side of the connection portion with the arc runner 21 is bent downward. Even with such a configuration, the same effect as that of the above embodiment can be obtained. Furthermore, in this embodiment, normally,
The arc runner 21 made of iron having high mechanical strength does not have to be bent only by bending the connecting conductor 7 made of copper, and there is an advantage that work can be performed easily.

Example 48. This embodiment is another embodiment of the invention of claim 21. In Examples 46 and 47, after the arc spot moved to the arc runner 21, a current flows through the arc runner 21, and this current flows through the connecting conductor 7 facing that part of the arc runner 21 as shown in FIG. It is almost parallel to the flowing current and its direction is opposite. Therefore, an electromagnetic repulsive force acts between the connecting conductor 7 and the arc runner 21. The arc runner 21 connects the connecting conductor 7 to the connecting portion 4
It is fixed only at the portions 5 and 46, and if the above-mentioned electromagnetic repulsive force that lifts the tip portion 43 of the arc runner is applied, the connection portions 45 and 46 are easily damaged. This is especially a concern at high currents. The connection strength between the arc runner 21 and the connection conductor 7 is stronger when the connection area between the arc runner 21 and the connection conductor 7 is wider, even if the connection is made by brazing, rivets, or the like. can do.

In this embodiment, as shown in FIG. 79, the connecting portions 45 and 46 on both sides of the contact plate 5 of the arc runner 21 are extended in the direction opposite to the terminal portion 6 and are connected to each other in front of the contact plate 5. It is configured to have a connecting portion 47. Then, the connecting portion 47 of the arc runner 21 is connected to the connecting conductor 7,
Thicken below the other parts of the arc runner 21,
The arc runner 21 and the connecting conductor 7 are prevented from contacting with each other except the connecting portion. Even with such a configuration, the same effect as that of the above embodiment can be obtained. Further, in this embodiment, the connection between the arc runner 21 and the connecting conductor 7 is made in front of the contact plate 5 (on the side opposite to the terminal portion 6), so that the connection area can be easily widened and the connection strength can be increased. Can be increased.

Example 49. FIG. 80 shows a fixed contactor of a circuit breaker according to an embodiment of the invention of claim 22. Here, in the fixed contactor 4, the contact plate 5 is formed by cutting and bending the connection conductor 7 as in the case of the 43rd embodiment. Similarly, the contact conductors 7 on both sides of the contact plate 5 and on the terminal portion side are covered with an arc runner 21 made of a magnetic material such as iron. As shown in FIG. 81, which is an AA cross section of FIG. 80, the arc runner 21 of the present embodiment further has a portion 4 that extends to the space above the connection conductor 7 and below the contact plate 5.
Eight. Top surface of arc runner 21 and contact plate 5
A gap is provided between them so that there is no electrical contact.
Of course, an insulator may be provided instead of the gap.

Even with such a structure, the embodiment 43 described above is used.
As well as excellent blocking performance can be obtained. Further, in this embodiment, the electromagnetic force driving the arc A in the direction of the kerf 20 is strengthened. In FIG. 81, the back side of the drawing shows the terminal portion 6 side,
Assuming that the current flows from the terminal portion 6, the current flowing in the connection conductors 7b on the left and right of the cut groove 36, which is formed when the contact plate 5 is formed by cutting and bending, is in the direction from the back of the paper as shown in the figure. These currents cause a reverse driving force to the arc A, that is, a magnetic field B that drives the arc A in the direction opposite to the kerf 20.
2 is generated. The magnetic field B2 is shielded by the arc runner 21 made of a magnetic material as in the case of Example 43. However, in this example, since the arc runner portion 48 is also under the contact plate 5,
The effect of shielding the magnetic field of B2 is higher.

Further, although the current flowing through the contact plate 5 flows away from this side of the paper, the magnetic field B1 due to this current generates an electromagnetic force for driving the arc A in the direction of the kerf 20, but below the contact plate 5. Since there is an arc runner portion 48 of a magnetic material in the path of the magnetic field B1, the magnetic resistance is low and the magnetic field B1 is very strong. Due to these effects, the force for driving the arc A in the direction of the kerf 20 is increased, and the cooling effect by the base exposed surface 33 of the kerf 20 described above is enhanced, and the blocking performance is further improved.

Example 50. FIG. 82 shows another embodiment of the invention of claim 22. In the above embodiment, the arc runner 21
82 has a flat upper surface, but as shown in FIG. 82, even if a high portion 49, which is a portion higher than the other portion on the kerf 20 direction side of the contact plate 5 of the arc runner 21, is provided, it is the same as the above embodiment. Has a similar effect. Furthermore, the kerf 20 is cut from the contact plate 5.
Since the high portion 49 of the arc runner 21 on the direction side is high, the arc spot on the fixed contact 3 easily moves to the high portion 49 of the arc runner 21, and the breaking performance is further improved. Figure 83
In another modification of this embodiment, the width of the high portion 49 of the arc runner 21 on the kerf 20 direction side of the contact plate 5 is narrowed. Even if it does in this way, the same effect is obtained.

Example 51. FIG. 84 shows a fixed contact of another embodiment of the invention of claim 22. In this embodiment, the arc runner 21 is bent from the side of the fixed contact 3 in the direction of the kerf 20 to form a high portion 49 of the arc runner on the kerf 20 direction side of the contact plate 5. FIG. 85 is a trihedral view of the arc runner 21 of this embodiment. As can be seen from FIGS. 84 and 85, the terminal portion 6 of the arc runner 21
In order to form a high portion on the side, leaving a portion 50 under the contact plate 5 and forming a groove on the terminal portion 6 side of the contact plate 5 and the portions 49, 51, 52 of the arc runners located on both sides. Bent in the insertion direction. Even with this structure, the same effect as that of the above embodiment can be obtained. Further, in this embodiment, the arc runner 2 is used.
Not only the height 49 of the contact plate 5 in the direction of the terminal portion 6 but also the lateral portions 51 and 52 of the fixed contact 3 can be increased, so that the movement of the arc spot to the arc runner 21 becomes easier. Therefore, the breaking performance is improved.

Example 52. FIG. 86 shows a fixed contactor of a circuit breaker according to an embodiment of the invention of claim 23. Here, in the fixed contactor 4, the contact plate 5 is formed by cutting and bending the connection conductor 7 as in the case of the 43rd embodiment. Similarly, the contact conductors 7 on both sides of the contact plate 5 and on the terminal portion side are covered with an arc runner 21 made of a magnetic material such as iron. Further, in this embodiment, the tip portion 4 of the arc runner 21 is
3 enters into the inside of the cut groove 20 provided in the connection conductor 7. Naturally, the tip 43 of the arc runner is the kerf 2
It is narrower than 0. It goes without saying that the above-mentioned configuration has the same effect as that of the 43rd embodiment.

Further, in this embodiment, as shown in FIG. 87, which is an AA cross section of FIG. 86, the arc spots on the fixed contact 3 flow to the contact plate 5 and the connection conductors 7a on the left and right of the cut groove 20 when the current is cut off. The current can move to the arc runner 21 and further reach the tip 43 of the arc runner 21. The tip portion 43 of the arc runner 21 is the kerf 2
It extends to 0 and is very close to the exposed base surface 33. Therefore, the area in which the arc A contacts the exposed base surface 33 is increased, and a larger energy of the arc A is given to the exposed base surface 33. As a result, thermal decomposition of the exposed base surface 33 increases and the amount of pyrolysis gas generated increases, so that the cooling effect of the gas on the arc A is improved. Therefore, the breaking performance can be further improved.

Example 53. FIG. 88 shows another embodiment of the invention of claim 23. In the above embodiment, the surface 33 of the base 15 is exposed from the kerf 20, but as shown in FIG. 88, the cooling plate 23 is placed between the kerf 20 and the base surface 33,
You may cool by making the arc at the time of interruption contact the cooling plate 23. Even with such a configuration, the same effect as that of the above embodiment can be obtained. Further, the material of the base 15 is selected from mechanical strength, working accuracy, and cost because it is used in large quantities, and it may not be possible to sufficiently select the material from the viewpoint of cooling performance when touched by an arc. The cooling plates 23 can independently be made of a material having the highest arc cooling effect.
Therefore, the breaking performance can be further improved.

The material of the cooling plate 23 may be either an organic substance such as plastic or an inorganic substance such as ceramics. In particular, organic substances have a great effect because thermal decomposition gas is easily generated. For example, resins such as polybutylene terephthalate, polyoxybenzylene, polyamide, etc., or glass fibers, ceramic fibers, magnesium hydroxide, etc. as fillers are mixed with these resins. There are things that have been done. FIG. 89 shows a modification of this embodiment. In this example, a large number of grooves 53 are provided on the surface of the cooling plate 23 in contact with the arc as shown in the figure. By doing so, it is possible to increase the surface area of the cooling plate 23 that comes into contact with the arc when the current is cut off, and more pyrolysis gas is generated to enhance the cooling effect.

Example 54. FIG. 90 shows another embodiment of the invention of claim 23. In this embodiment, a substantial space 34 is provided between the portion of the connecting conductor 7 having the kerf 20 and the exposed base surface 33, and the tip portion 4 of the arc runner 21 is provided.
3 protrudes from the kerf 20 toward the base exposed surface 33 side. Even with such a configuration, the same effect as that of the 52nd embodiment can be obtained. Further, as described above, the contact plate 5 and the kerf 20
The arc spot on the fixed contact 3 is caused by the electromagnetic force generated by the current flowing through the left and right connecting conductors 7a of the arc runner 21
When it reaches the tip end portion, the current flows in the configuration of the present embodiment as indicated by the arrow in FIG.

The electric current flowing through the tip end portion 43 of the arc runner generates an electromagnetic force that presses the arc A against the exposed base surface 33. In addition, since the current flowing through the connecting conductors 7a on the left and right of the kerf 20 is in the opposite direction to the current flowing through the arc A, the arc A
Is pressed against the exposed base surface 33. Thus, once the arc spot moves to the tip portion 43 of the arc runner, an electromagnetic force that presses the arc A against the exposed surface 33 of the base is additionally generated. Breaking performance is improved.

FIG. 91 shows a modification of this embodiment.
The tip 4 of the arc runner 21 penetrating the kerf 20
3 is bent downward, and the tip end portion 43 of the arc runner is directed to the exposed base surface 33. In general, a high temperature gas, which is a metal vapor obtained by evaporating an electrode material that is the substance of the arc, is ejected from the arc spot in a direction perpendicular to the electrode surface of the arc spot. Therefore, with the configuration of this embodiment, when the arc spot reaches the tip portion 43 of the arc runner as in the above embodiment, an additional electromagnetic force is exerted, and in addition to the arc spot of the tip portion 43 of the arc runner, the arc runner 21 The arc is blown in the direction in which the surface of (1) faces, that is, the exposed base surface 33. Due to the effect of this spray, more pyrolysis gas is generated and the arc A
Cooling is promoted and the blocking performance is improved.

In Examples 52 to 54, the arc runner 21 is shown as a flat plate on the fixed contact 3 side of the kerf 20, but as shown in FIG. By using a curved structure in which the arc runner 21 and the connecting conductor 7 do not come into electrical contact with each other, even after the arc spot moves to the arc runner 21, the arc A is exposed to the base by the electromagnetic force of the current flowing through the arc runner 21. You may make it press strongly on 33.

Example 55. FIG. 93 is a side view of a fixed contact of a circuit breaker according to an embodiment of the invention of claim 24. Further, FIG. 94 is a plan view. Fixed contactor 4 here
In the same manner as in Example 52, the contact plate 5 is formed by cutting and bending the connecting conductor 7. Similarly, the connecting conductors 7 on both sides of the contact plate 5 and on the terminal side are covered with an arc runner 21 made of a magnetic material, for example, iron, and the tip end portion 43 of the arc runner 21 is provided on the connecting conductor 7. It has entered the inside of the kerf 20. The arc runner 21 of the present embodiment is substantially U-shaped (or U-shaped), the U-shaped leg portions 45a and 46a are located on both sides of the contact plate 5, and the U-shaped bottom portion The tip 43 is in the kerf.

The tips 54, 55 of the U-shaped legs 45a, 46a are punched out downward in FIG.
From the lower surface of the other part of the arc runner 21 to the tip 54,
The lower surface of 55 projects downward. Arc runner 2
The tip portions 54 and 55 of No. 1 are connected to the end portion of the connecting conductor 7 opposite to the terminal portion 6 by rivets 56 and 57. On the other hand, the U-shaped bottom portion 49a of the arc runner 21 is formed by being bent upward in FIG. 93, and at least the tip end portion 43 of the arc runner is located higher than the fixed contact 3. Further, since the U-shaped leg portions 45a and 46a of the arc runner 21 are substantially horizontal, the arc runner 21 has the tip portions 54 and 55 of the U-shaped leg portion.
The contact conductor 7 is in contact only with the portion of.

Since the arc runner 21 is constructed as described above in this embodiment, the arc spot on the fixed contact 3 is fixed to the U-shaped bottom portion of the arc runner 21 by the electromagnetic force generated by the current flowing through the contact plate 5 when the current is cut off. Even when moving to 49a, the current in the same direction as the current flowing in the contact plate 5 continues to flow in the U-shaped leg portions 45a and 46a of the arc runner 21. Since this current generates an electromagnetic force that drives the arc A in the direction of the kerf 20, the driving force in the direction of the kerf 20 disappears even at the moment when the arc spot is transferred from the fixed contact 3 to the U-shaped bottom 49a of the arc runner. There is nothing to do. The portion of the U-shaped bottom 49a of the arc runner 21 closest to the fixed contact 3 is the edge portion 58, and the arc spot on the fixed contact 3 is considered to first transfer to this edge portion 58. Normally, arcs tend to stay in the corners such as edges.

In this embodiment, the driving magnetic field continues to act on the arc even at the moment when the arc spot is transferred to the U-shaped bottom portion 49a of the arc runner most likely to stay. Driven. At this time, the kerf 20 and the left and right connecting conductors 7
As described above, a also plays an important role. FIG. 93 shows a state in which the arc spot reaches the tip portion 43 of the arc runner. At this time, the electromagnetic force that presses the arc A against the exposed base surface 33 is
The current flows through the U-shaped legs 45a and 46a and the U-shaped bottom 49a of the arc runner 21, and is strong because the current path is long. Therefore, the base exposed surface 33
The cooling effect of the pyrolysis gas of is great and the excellent blocking performance can be exhibited. In the above embodiment, the arc runner 21
Although the connection conductor 7 and the connection conductor 7 are connected by rivets, other methods such as welding or brazing may be used.

Example 56. FIG. 95 shows a fixed contact of another embodiment of the invention of claim 24. 95 (a) is a top view, FIG. 95 (b) is a side view, and FIG. 95 (c) is a bottom view seen from below. In this embodiment, the U-shaped bottom portion 49a of the arc runner 21 and the projecting portion 44 formed at the tip portion 43 are provided, and the kerf 36 and the kerf 20 which are formed by cutting and bending the contact plate 5 are formed. It is integrated.
Further, the upper end portion 59 of the kerf 20 in FIG. 95 is provided so as to approach the terminal portion 6. This embodiment also has the same effect as the above embodiment.

Further, in this embodiment, the arc runner 21 is used.
Since the projection 44 is provided in the arc contact portion, when the arc spot moves from the fixed contact 3 to the arc runner 21, it is hard to stay in the edge portion 58 of the arc runner 21, and the arc spot is driven to the tip portion 43 of the arc runner more quickly. It Further, since the upper end 59 of the kerf 20 is in the terminal portion 6, the movement of the arc A toward the base exposed surface 33 is not restricted, and the arc A contacts the wider base exposed surface 33. Therefore, the cooling effect is enhanced and the blocking performance is improved.

Example 57. FIG. 96 shows a fixed contact of another embodiment of the invention of claim 24. In this embodiment, the connection conductor 7 around the cut groove 20 is insulated by the insulator 31. The inner surface of the kerf 20 is also covered with the insulator 31 as shown in FIG. The other structure is the same as that of the above embodiment, and this embodiment also has the same effect as that of the above embodiment.

Further, in the present embodiment, since the connecting conductor 7 around the kerf 20 is insulated by the insulator 31, the arc spot has a tip portion 43 of the arc runner 21.
The arc A (not shown) that has moved to No. 2 not only thermally decomposes the exposed surface 33 (not shown) of the base of the kerf 20 as in the above embodiment, but also heats the insulator 31 inside the kerf 20. Since it is decomposed and cooled by a large amount of pyrolysis gas, the barrier performance is further improved. In addition, the insulator 31 around the kerf 20 has both sides when the current is large and the diameter of the arc is larger than the width of the kerf 20 covered with the insulator 31 so that the arc cannot enter the kerf 20. The arc is cooled and the width of the arc is reduced so that the arc has a kerf 20
It also helps to get inside.

FIG. 97 shows a modification of this embodiment.
An insulator 60 is added so as to insulate the fixed contact 3 and the portion other than the protrusion 44 of the arc runner 21. In the present embodiment, the one integrated with the insulator 31 for insulating the connection conductor 7 around the cut groove 20 is shown. Even with such a configuration, the same effect as that of the above embodiment can be obtained.

Since the arc runner 21 is insulated by the insulator 60 except for the protrusions 44, even if the arc spot is large and the arc spot does not fit in the tip end portion 43 of the arc runner 21 inside the kerf 20, the arc spot is not protruded. Four
Limited to 4. Then, since the insulator 60 around the protrusion 44 releases the pyrolysis gas by the arc heat, the arc is also cooled by the pyrolysis gas. Therefore, in this embodiment, the breaking performance can be further improved.

Example 58. FIG. 98 shows a fixed contactor of a circuit breaker according to an embodiment of the invention of claim 25. Here, in the fixed contactor 4, the contact plate 5 is formed by cutting and bending the connecting conductor 7 as in the case of the 52nd embodiment. Similarly, the connecting conductors 7 on both sides of the contact 5 and on the terminal portion side are covered with an arc runner 21 made of a magnetic material, for example, iron, and the tip end portion 43 of the arc runner 21 is provided with the cutting conductor provided on the connecting conductor 7. It has entered the inside of the groove 20. Further, in this embodiment, as shown in FIG. 99 (arc runner 21 is not shown) showing the AA cross section of FIG. 98, the connection conductors 7b on the left and right of the cut groove 36 formed below the contact plate 5 of the connection conductor 7 are formed. The base angle θ of an isosceles triangle formed by connecting the center of gravity of each cross section and the center of the surface of the fixed contact 3 is configured to be less than 45 degrees. Even with such a configuration, the same effect as that of the 52nd embodiment can be obtained.

Further, in this embodiment, the electromagnetic force due to the current flowing through the left and right connecting conductors 7b of the cut groove 36 of the connecting conductor 7 below the contact plate 5, which adversely affects the driving of the arc spot on the fixed contact 3, is reduced. it can. The arc is roughly divided into an arc spot and other arc positive columns. Although the electromagnetic force acts on both the arc spot and the arc positive column, the normal arc positive column tends to respond sensitively to the electromagnetic force and tries to move, but the arc spot tends to stay and limits the driving of the arc. Therefore, the driving magnetic field in the arc spot portion is strengthened for arc driving. In the present case, it is important to reduce the reverse driving magnetic field on the surface of the fixed contact 3.

In FIG. 99, assuming that the back side of the paper is in the direction of the terminal portion 6 and the current flows from the terminal portion 6, the current flowing through the connection conductors 7b on the left and right of the kerf 36 is in the front direction from the back of the paper. This current generates a magnetic field that drives the arc A in the opposite direction to the terminal portion 6 as described above. As shown in FIG. 99, the distance between the centers of gravity of the cross sections of the left and right connecting conductors 7b is 2d.
And the distance from the straight line connecting the centers of gravity to the surface of the fixed contact is h. Further, assuming that the currents flowing in the left and right connection conductors 7 are shunted to 1/2 of the total current I, the magnetic flux density B on the surface of the fixed contact 3 is as follows. B = k (I / d) sin (2θ) h = d · tan θ where k is a proportional constant.

FIG. 100 is a graph schematically showing the magnetic flux density B as a function of h. As can be seen from FIG. 100, it takes the maximum value when the distance h to the surface of the fixed contact 3 is d. After that, it gradually decreases as h increases (θ> 45 °). On the other hand, when h is smaller than d (θ <45 °), B rapidly decreases. As described above, the magnetic field (magnetic flux density) B is a magnetic field that drives the arc spot on the surface of the fixed contact 3 in the opposite direction, and the smaller the magnetic field, the easier it is to drive the arc A in the kerf 20 direction. . In order to reduce this magnetic field in the region where θ is 45 degrees or more, it is not effective unless the distance (h) to the surface of the fixed contact 3 is significantly increased as described above. However, if θ is configured to be less than 45 degrees as in the present embodiment, the reverse driving magnetic field can be effectively reduced by reducing the distance (h) to the surface of the fixed contact 3 as much as possible. As a result, the arc is easily driven into the kerf 20, and the breaking performance can be improved.

Example 59. FIG. 101 is a side view of an essential part of a circuit breaker according to an embodiment of the invention of claim 26. Here, the fixed contactor 4 uses the contact plate 5 as in the case of the 52nd embodiment.
Is formed by cutting and bending the connection conductor 7. Also,
Similarly, the connecting conductors 7 on both sides of the contact plate 5 and on the side of the terminal portion 6 are covered with an arc runner 21 made of a magnetic material, for example, iron. It has entered the inside of the groove 20. Further, in this embodiment, the shortest distance PQ1 between the tip portion 32 of the movable contactor 1 and the tip portion 43 of the arc runner 21 shown in the figure.
= R1 is shorter than the shortest distance PQ2 = r2 between the tip 32 of the movable contact 1 and the connecting conductor 7.

Even with the above construction, the same effect as that of the 52nd embodiment can be obtained. Further, as shown in FIG.
Is driven and the arc spot on the fixed contact 3 moves to the tip of the arc runner 21, the arc A receives an electromagnetic force in the direction of the kerf 20 due to the current flowing through the arc runner 21 as described above. There is. In actual disconnection, the arc A is connected to the conductor 7 by this electromagnetic force.
It is possible to jump to. FIG. 103 shows a state at the moment when the arc spot on the tip end portion 43 of the arc runner moves to the connecting conductor 7 by the electromagnetic force.

When the arc spot moves from the tip end portion 43 of the arc runner to the connecting conductor 7, the arc runner 21
Since the electromagnetic force in the direction of the terminal portion 6 is applied by the current flowing through the arc spot, the arc spot is not at the point Q2 on the connecting conductor 7 where the distance from the movable contact 1 is shortest, but at the terminal portion 6 side 59 of the kerf 20. Will move to. In this state, the current of the arc runner 21 that drives the arc A toward the terminal portion 6 does not flow, and the current flowing in the terminal portion 6 generates an electromagnetic force that pushes the arc A back to the fixed contact 3 side.

In order to shorten the arc length as much as possible in terms of the nature of the arc, the arc spot on the terminal portion 6 side 59 of the kerf 20 of the connecting conductor 7 is on the connecting conductor 7 which is the shortest distance from the movable contact 1. Move to point Q2. However, the point Q1 on the arc runner 21 is further moved to the movable contact 1.
Because it is close to, the arc spot is eventually the arc runner 21
It returns to the point Q1 of the tip portion 43 of the.

As described above, the arc spot actually moves from the arc runner 21 to the connecting conductor 7 and then returns to the arc runner 21 for a moment. Therefore, in the configuration of the present embodiment, even if the arc moves to the connection conductor 7 for some time, it returns instantly to the arc runner 21, so that the effect of the invention described in the embodiment 52 can be stably exhibited. It is possible to improve the breaking performance.

In this embodiment, the case where the shortest distance between the movable contact 1 and the terminal portion 6 is larger than the shortest distance PQ2 = r2 between the movable contact 1 and the connecting conductor 7 has been described.
The shortest distance between the movable contact 1 and the terminal portion 6 is the connecting conductor 7.
Is shorter than the shortest distance PQ2 = r2, the shortest distance PQ1 = between the movable contact 1 and the arc runner 21
It goes without saying that r1 must be smaller than the distance between the movable contact 1 and the terminal portion 6.

Example 60. FIG. 104 shows another embodiment of the invention of claim 26. Also in this embodiment, the shortest distance PQ1 = r1 between the movable contactor 1 and the arc runner 21 is smaller than the shortest distance PQ2 = r2 between the movable contactor 1 and the connecting conductor 7 as in the above embodiment. Furthermore,
In this embodiment, a substantially horizontal end face 61 is provided at the tip end portion 43 of the arc runner 21 without changing the relationship between r1 and r2. Also in this embodiment, the same effect as that of the above embodiment is obtained.

As described above, in general, a high-temperature gas consisting of metal vapor, which is the substance of the arc, is ejected from the arc spot in the direction perpendicular to the electrode surface of the arc spot.
Therefore, in the above-described embodiment, since the surface of the tip end portion 43 of the arc runner faces the movable contact 3 side, the arc blows out in the direction of the movable contact, so it is difficult to contact the base exposed surface 33.
However, as in the present embodiment, since the horizontal end face 61 is provided at the tip end portion 43 of the arc runner, the arc is blown vertically from the arc spot driven by the end face 61, and the arc is exposed on the base exposed surface 33 of the kerf 20. Has the advantage of being easy to contact. Therefore, the generation of the thermal decomposition gas of the exposed base surface 33 by the arc A is promoted, the cooling effect of the arc A by the gas is improved, and the breaking performance is enhanced.

Further, FIG. 105 is a modification of this embodiment and has a structure in which the end face 61 of the tip end portion 43 of the arc runner 21 is directed toward the base exposed surface 33. With such a structure, the arc A blows out from the arc spot toward the base exposed surface 33, so that the arc is more likely to contact the base exposed surface 33.

FIG. 106 shows another modification. Figure 10
6 (a) is a side view and FIG. 106 (b) is a plan view of the fixed contact. In this modified example, as shown in the drawing, a protrusion 44 is provided on the tip end portion 43 of the arc runner 21, and the end surface 61 of the protrusion 44 is configured to face the base exposed surface 33 direction. Even with this structure, the arc A is likely to contact the exposed base surface 33 as well.

Example 61. FIG. 107 shows another embodiment of the invention of claim 26. FIG. 107 (a) is a side view and FIG. 107 (b) is a plan view. However, FIG.
In (b), the movable contact 1 is omitted. Also in this embodiment, the movable contactor 1 and the arc runner 21 are similar to the above embodiments.
The shortest distance PQ1 = r1 between the movable contact 1 and the connecting conductor 7 is
And the shortest distance PQ2 = r2.
Further, in the present embodiment, the protruding portion 62 is provided on the base of the arc runner 21 closer to the terminal portion 6 side than the tip portion 43 of the arc runner 21 so as to penetrate the kerf 20, and the exposed base surface 33 of the protruding portion 62 facing the movable contact 1. Is configured almost vertically.

Even with the above construction, the same effect as that of the 59th embodiment can be obtained. Further, since the base exposed surface 33 of the protruding portion 62 of the base is on the terminal 6 side of the tip portion 43 of the arc runner, the arc A is perpendicular to the surface of the tip portion 43 of the arc runner as shown in FIG. 107 (a). Even when blown out, the arc A easily contacts the base exposed surface 33 and is easily cooled because the base exposed surface 33 of the base protruding portion 62 is in the immediate vicinity. As a result, the blocking performance is further improved. In addition,
In this embodiment, the case where the base exposed surface 33 for arc cooling is provided on the protruding portion 62 of the base has been described. However, the base exposed surface 33 for arc cooling is configured by another member without protruding the base. Good.

Example 62. This embodiment is another embodiment of the invention of claim 1. In the embodiment described above, the kerf 20 has the opening (first portion) formed by punching the connecting conductor 7.
However, the openings shown in FIGS. 108 to 111 may be used. FIG. 108 shows an opening that is open to both sides along the center line of the connecting conductor 7. Although the opening has a smaller cross-sectional area and a larger current density than the other portions, this structure can suppress an increase in the current density and also improve the mechanical strength of the opening.

FIG. 109 shows a bottom-bottomed product that is punched out downward, and can suppress an increase in current density and have mechanical strength. If an arc cooling member is attached to the bottom of the ship bottom, the arc cooling effect is increased.

FIG. 110 shows a structure in which the rising portion of the connecting conductor 7 is retracted so that the force for pushing back the arc by the electric current flowing on both sides of the opening is reduced. FIG. 111
Indicates a circular hole, and may be an ellipse or an ellipse. There are various modifications other than the above four embodiments, but in short, any opening (first opening) may be used so that the current is shunted to both sides. Further, the kerf 36 can also be applied as an opening (second opening) as described above.

Example 63. This embodiment is another embodiment of the invention of claim 1. In the embodiment described above, in the fixed contactor 4, the terminal portion 6 was on the top of the rising portion of the connection conductor 7, but as shown in FIGS. 112 and 113, the terminal portion 6 was below the top portion of the rising portion. May be there. It can be used when the structure is constrained by the structure, base structure, case structure, etc.

Example 64. FIG. 114 shows a side view of the essential parts of a circuit breaker according to an embodiment of the invention of claim 27. Reference numeral 4 denotes a fixed contact, which is composed of a connecting conductor 7 having a terminal portion 6 at one end and a contact plate 5 to which the fixed contact 3 is fixedly connected at the other end. As shown in the figure, the contact plate 5 substantially overlaps the connection conductor 7, but a gap 63 is provided so that there is no electrical contact other than the connection point between the two.

Reference numeral 1 denotes a movable contact, to which a movable contact 2 which can be brought into contact with and separated from the fixed contact 3 by being rotated around a rotation center 1a is fixed. The movable contactor 1 is mechanically connected to a mechanism section (not shown) and electrically connected to the other terminal (not shown) through a relay section (not shown). Reference numeral 8 denotes an arc extinguishing plate, which has a substantially U-shaped notch so as not to hinder the rotation of the movable contact 1. 15 is the base, 1
Reference numeral 6 is a cover, which is a box for accommodating the electrode portion, the mechanism portion, and the relay portion.

FIG. 115 is a plan view of the fixed contactor 4 of this embodiment, and FIG. 116 shows only the cross-section portion for explaining the operation in the AA cross section of FIG. As shown in FIG. 115, the connecting conductor 7 facing the contact plate 5 is provided with a kerf 36 symmetrically with respect to the center line in the longitudinal direction. 7b
Are the left and right connecting conductors 7 on both sides of the kerf 36. As shown in FIG. 115, when the center of gravity of each of the cross sections of the connection conductors 7b on the left and right of the kerf 36 is a, b, and the center of the contact surface of the fixed contact 3 is c, isosceles with ab being the base The base angle θ of the triangle abc is configured to be less than 45 degrees. The surface of the contact plate 5 to which the contacts are fixed is located above the upper surfaces of the left and right connecting conductors 7b.

Next, the operation will be described. Movable contact 1
In the closed state, the movable contact 2 and the fixed contact 3 are in contact with each other, and the current flows from the terminal portion 6 through the fixed contact 4 and the movable contact 1 and through the relay portion to the other terminal.
At this time, the mechanism section is manually operated, or a fault current flows and the mechanism section automatically moves by a signal from the relay section to open the movable contact 1 and separate the fixed contact 3 and the movable contact 2. An arc is generated between the contact and the contact. Since the above is the same as the conventional example, detailed description will be omitted.

FIG. 117 shows a state in which an arc A is generated between the contacts. The arc extinguishing plate is omitted here. The arrow in the figure indicates the current when the current flows from the terminal portion 6. The magnetic field generated by the current flowing through the contact plate 5 in the portion of the arc A is directed from the back of the paper toward this side, and this magnetic field generates an electromagnetic force that drives the arc A in the direction of the terminal portion 6. The current flowing through the left and right connecting conductors 7b generates a magnetic field in the depth direction from here on the surface of the arc A, and this magnetic field generates an electromagnetic force that drives the arc A in the direction opposite to the terminal portion.

Generally, an arc blows out a high-temperature gas consisting of metal vapor, which is the substance of the arc, in the vertical direction from the arc spot to the electrode surface with which it is in contact. Therefore, in order to drive the arc in a certain direction, the blown-out arc must be bent in the driving direction as soon as possible. That is, it is necessary to apply a large driving force at a position as close to the arc spot as possible.
In this case, it is necessary to strengthen the electromagnetic force in the direction of the terminal portion 6 on the arc spot, that is, on the surface of the fixed contact 3. Conversely,
It is necessary to reduce the magnetic field on the surface of the fixed contact 3 due to the current flowing through the connection conductors 7b on the left and right of the cut groove 36 that generate an electromagnetic force in the direction opposite to the terminal portion 6.

In this embodiment, the electromagnetic force due to the current flowing through the connection conductors 7b on the left and right of the cut groove 36 of the connection conductor 7 facing the contact plate 5 that adversely affects the driving of the arc spot on the fixed contact 3 is reduced. can do. 118 shows the AA cross section of FIG. 117, and has the same relationship as FIG. 99 shown in the working example 58.

In FIG. 118, assuming that the back side of the paper is the direction of the terminal portion 6 and current flows in from the terminal portion 6, the current flowing through the connection conductors 7b on the left and right of the kerf 36 is forward even to the back of the paper. This current generates a magnetic field that drives the arc A in the opposite direction to the terminal portion 6 as described above. As shown in FIG. 118, the distance between the centers of gravity ab of the cross sections of the left and right connecting conductors 7b is 2d, and the distance from the straight line connecting the centers of gravity to the fixed contact surface is h. Further, assuming that the currents flowing in the left and right connection conductors 7 are shunted to 1/2 of the total current I, the magnetic flux density B on the surface of the fixed contact 3 is as follows (the same as the formula of Example 58). . B = k (I / d) sin (2θ) h = d · tan θ where k is a proportional constant.

FIG. 119 is a graph schematically showing the magnetic flux density B as a function of h. As can be seen, the magnetic flux density B has a maximum value when the distance h to the surface of the fixed contact 3 is d. I take the. After that, it gradually decreases as h increases (θ> 45 °). On the other hand, when h is smaller than d (θ <45 °), B rapidly decreases. As described above, the magnetic field (magnetic flux density) B is a magnetic field that drives the arc spot on the surface of the fixed contact 3 in the opposite direction, and the smaller the magnetic field, the easier the arc A is to drive in the terminal direction.

In order to reduce this magnetic field in the region where θ is 45 degrees or more, there is no effect unless the distance (h) to the surface of the fixed contact 3 is significantly increased as described above. However, if θ is set to be less than 45 degrees as in the present embodiment, the reverse drive magnetic field on the surface of the fixed contact 3 can be reduced by reducing the distance (h) to the surface of the fixed contact 3 as much as possible. It can be effectively reduced.

Further, as shown in FIG. 118, the arc spot on the fixed contact 3 spreads to the surface of the contact plate 5 as the current increases. If the arc spot further spreads and the arc spot spreads to the left and right connecting conductors 7b, a part of the current passing through the contact plate 5 is directly arced A from the left and right connecting conductors 7b.
Comes to flow. As a result, the current flowing through the contact plate 5 decreases, and the electromagnetic force that drives the arc A toward the terminal portion 6 decreases. In this embodiment, since the arc spreading surface of the contact plate 5 is located at a position higher than the upper surfaces of the left and right connecting conductors 7b, the arc spot does not spread further to the left and right connecting conductors 7b, and all the current flows through the contact plate 5. Via. Therefore, the electromagnetic force that drives the arc A due to the current flowing through the contact plate 5 toward the terminal portion 6 does not decrease.

As described above, in this embodiment, the electromagnetic force for driving the arc A in the direction of the terminal portion 6 can be strengthened, so that the arc A is greatly stretched. As a result, the cooling action of the arc-extinguishing plate 8 works effectively, so that an excellent breaking performance is obtained. FIG. 120 shows a modification of this embodiment, in which the contact plate 5 is formed by cutting and bending the connecting conductor 7. With such a configuration, the same effect as the above embodiment can be obtained.

Example 65. FIG. 121 shows another embodiment of the invention of claim 27, in which an arc runner 21 is provided on the terminal portion 6 side of the fixed contact 3, and the upper surface of this arc runner 21 is at least the same as the surface of the fixed contact 3. It is constructed lower than that. Even with such a configuration, the same effect as that of the above embodiment can be obtained. Furthermore, since the arc spot on the fixed contact 3 is driven in the direction of the terminal portion 6 by the strong electromagnetic force described above, it moves on the arc runner 21. Since the height of the surface of the arc runner 21 is the same as or lower than the height of the fixed contact 3, the height of the surface of the arc runner 21 is set to be the height with the center of gravity of the left and right connecting conductors 7b as the base, as in the above embodiment. In an isosceles triangle, the base angle is 45
Less than degree.

Therefore, as described above, in this embodiment, the reverse driving magnetic field can be reduced even for the arc spot moved on the arc runner 21. As a result, the arc A promptly moves to the tip portion 4 of the arc runner 21.
3 is driven between the movable contact 2 and the movable contact 2, and is greatly extended,
The arc extinguishing plate 8 is more likely to be cooled and the breaking performance is improved.

FIG. 122 shows an embodiment in which the kerf 36 provided in the connection conductor 7 under the contact plate 5 is extended in the direction of the terminal portion 6 to the portion of the connection conductor 7 facing the arc runner 21 in this embodiment. ing. With such a configuration, of the current paths for generating the reverse driving magnetic field on the fixed contact 3 and the arc runner 21, the paths flowing through the left and right connecting conductors 7b become long, so the fixed contact 3 and the fixed contact 3 described in the above embodiment are provided. The reverse driving magnetic field on the arc runner 21 can be further reduced.

Example 66. FIG. 123 shows a fixed contactor of a circuit breaker according to an embodiment of the invention. FIG. 124 is a plan view of this fixed contact, and FIG. 125 is FIG.
4 is an AA cross section of FIG. Here, the fixed contactor 4 has the same configuration as that of the 64th embodiment, such as the positional relationship between the surface of the fixed contact 3 and the left and right connecting conductors 7b of the cut groove 36.
Further, in the present embodiment, the surface of the connection conductor 7 is covered with the insulator 64, and the insulator 64 is inserted and fixed in the gap 63 between the contact plate 5 and the connection conductor 7.

Even with such a configuration, the above-mentioned Embodiment 64 is used.
It goes without saying that it has the same effect as. Further, in this embodiment, as shown in FIG. 125, since the left and right connecting conductors 7b located on both sides of the contact plate 5 are covered with the insulating material, the insulating material 64 in this portion is thermally decomposed by the heat of the arc A. The gas is released as indicated by the arrow in the figure. As a result, the arc A is also cooled by this pyrolyzed gas, so that the breaking performance is further improved.

The insulator 64 may be either an organic substance such as plastic or an inorganic substance such as ceramics. In particular, organic substances have a great effect because thermal decomposition gas is easily generated. For example, resins such as polybutylene terephthalate, polyoxybenzylene, polyamide, etc., or glass fibers, ceramic fibers, magnesium hydroxide, etc. as fillers are mixed with these resins. There are things that have been done.

Example 67. FIG. 126 shows another embodiment of the invention of claim 28, which has the same structure as the above embodiment, but in this embodiment, the AA cross section of FIG.
As shown in FIG. 127, a groove 65 having the width of the contact plate 5 is provided in a portion of the insulator 64 where the contact plate 5 abuts.
It is configured to sink in 5. Of course, even with such a configuration, the same effect as that of the above-described embodiment can be obtained. Further, in this embodiment, the step between the fixed surface of the fixed contact 3 of the contact plate 5 and the insulator 64 can be reduced. Therefore, since the surface of the insulator 64 is close to the arc spot on the fixed contact 3, more pyrolyzed gas of the insulator 64 is generated and the arc is cooled, so that the breaking performance can be improved.

FIG. 128 shows a modification of this embodiment. Here, a portion 66 of the insulator facing the kerf 36 is provided with a protruding portion 66 downward in the width of the kerf 36, and the protruding portion 66 is provided.
To the cut groove 36 to fix the insulator 64. For this reason, the depth of the groove 65 in which the contact plate 5 of the insulator 64 is inserted is made deeper by the amount of the protrusion 66. It goes without saying that even with such a configuration, the effects of the above-described embodiment can be obtained.

In each of the above embodiments, the case of the circuit breaker has been described, but other switches may be used and the same effect as that of the above embodiments can be obtained.

[0259]

As described above, according to the first aspect of the invention, since the first opening is provided at the rising portion of the connecting conductor, it is possible to reduce the magnetic field component that pushes the arc back to the contact side. Therefore, it is possible to obtain a switch having a simple configuration and excellent current limiting interruption performance.

According to the invention of claim 2, since the arc cooling member such as the base is provided inside the first opening, the arc is efficiently cooled and the current limiting interruption performance is improved. There is an effect that a switch having excellent current limiting interruption performance can be obtained.

According to the invention of claim 3, since the arc runner extending from the vicinity of the fixed contact toward the first opening is provided, the arc spot in the fixed contact side and the arc cooling in the first opening are provided. There is an effect that a switch having excellent current limiting interruption performance can be obtained with a simple structure by increasing the distance from the member and increasing the arc cooling action by the steam of the arc cooling member.

According to the fourth aspect of the invention, since the end of the arc runner on the side of the first opening is directed downward, the direction in which the arc is blown out is the arc cooling inside the first opening with a simple structure. There is an effect that it is possible to obtain a switch in which the arc is blown to the arc cooling member in the direction of the member and in the large current region, and particularly the current limiting interrupting performance at the time of interrupting the large current is improved.

According to the fifth aspect of the invention, the shortest distance between the tip of the movable contact and the arc runner is made shorter than the shortest distance between the tip of the movable contact and the connecting conductor.
Since the arc can be prevented from commuting to parts of the fixed contact other than the arc runner, and the electromagnetic force that stretches the arc can be maintained, breaking failure is less likely to occur, so a switch with improved breaking performance is obtained. It is effective.

According to the invention of claim 6, the width of at least the tip portion of the arc runner is made narrower than the width of the first opening portion of the connecting conductor portion, so that the arc is surely made into the arc cooling member in the first opening portion. There is an effect that it is possible to obtain a switch having an excellent current limiting interruption performance with a simple structure, which can be cooled by touching.

According to the invention of claim 7, since the tip of the arc runner is inserted into the first opening, the arc spot on the fixed contact side and the arc cooling in the first opening. There is the effect that the distance from the member can be made smaller, the arc cooling action is improved, and a switch having excellent current limiting interruption performance can be obtained with a simple configuration.

According to the invention of claim 8, since the cross-sectional area of the portion of the arc runner in the first opening on the fixed contact side is larger than the tip end portion of the arc runner, the heat capacity of the arc runner is increased and the arc runner is increased. Therefore, it is possible to obtain a switch that can reduce the consumption of the switch and that has a simple structure and does not deteriorate in the breaking performance even in a frequent breaking operation.

According to the invention of claim 9, since the tip end portion of the arc runner penetrates through the first opening,
When the arc spot arrives at the tip of the arc runner, the distance between the arc and the arc cooling member is shortened to improve the arc cooling action, and the diameter of the arc column is limited by the width of the first opening to reduce the arc voltage. There is an effect that it is possible to obtain a switch having excellent current limiting interruption performance with a simple configuration.

According to the invention of claim 10, the arc runner is inserted into the first opening and bent upward,
Since the tip of the arc is projected upward from the inside of the first opening, the arc hits the arc cooling member in the first opening at the initial opening and is cooled. There is an effect that it is possible to obtain a switch that can travel to the tip of the runner and reduce the steam generated from the arc cooling member, and therefore can prevent the container from being damaged due to the increase in the internal pressure when the current is cut off.

According to the invention of claim 11, since the arc horn is provided, the arc travels to the tip of the arc horn and approaches the arc cooling member in the first opening. The cooling effect of
Therefore, there is an effect that it is possible to obtain a switch having excellent current limiting interruption performance with a simple configuration.

According to the twelfth aspect of the invention, since the arc horn is provided at the tip of the movable contact so that the tip of the arc horn enters the first opening at the time of closing, the initial opening of the contact is particularly preferable. At the movable contact side arc spot and the first
The distance from the arc cooling member in the opening of the arc is shortened, the arc cooling action by the steam of the arc cooling member is improved, and the arc voltage can be quickly raised. Therefore, the excellent current limiting cutoff with a simple structure is achieved. There is an effect that a switch having performance can be obtained.

According to the thirteenth aspect of the invention, since the arc runner and the arc horn are provided, the distance between the arc and the arc cooling member in the first opening is reduced, and the arc cooling action by the steam of the arc cooling member is achieved. Therefore, there is an effect that it is possible to obtain a switch having an improved current limiting interruption performance with a simple structure.

According to the fourteenth aspect of the present invention, since the tip of the arc runner and the tip of the arc horn are inserted into the first opening when the valve is closed, the fixed contact side and the movable contact side are respectively provided. The distance between the arc spot and the arc cooling member in the first opening is reduced, and the arc cooling action by the steam of the arc cooling member is further improved. Therefore, a switch having a simple structure and excellent current limiting interruption performance. There is an effect that can be obtained.

According to the fifteenth aspect of the present invention, the tip of the arc runner is located in front of the first opening, and the tip of the arc horn is inserted into the first opening when the movable contact is closed. Since the movable contact is separated from the first opening when the movable contact is opened, the arc is moved away from the arc cooling member in the first opening in the latter half of the breaking operation to reduce the amount of vapor generated from the arc cooling member, There is an effect that it is possible to obtain a switch that can prevent damage to the container due to an increase in the pressure inside the container when the current is cut off.

According to the sixteenth aspect of the present invention, since the connecting conductor portion around the first opening is electrically insulated by the insulator, the diameter of the arc is increased and the arc resists the electromagnetic repulsive force. Then, when approaching the connection conductor portion around the first opening,
The arc is also cooled by the pyrolysis gas released from the insulator, and the width of the arc becomes smaller, making it easier to enter the first opening, and the arc is further cooled, especially even in a high current arc. Since it easily extends into the first opening and is easily subjected to cooling, there is an effect that a switch having an excellent breaking performance can be obtained even when breaking a large current.

According to the seventeenth aspect of the present invention, since the fixed contact mounting side of the fixed contact is folded back upward, and the fixed contact is used as the folded back portion as the contact plate, the contact plate flows. The electric current acts to drive the arc toward the first opening, and since the distance between the connecting conductor below the contact plate and the arc increases, the force that pushes the arc back to the contact side becomes weaker. Is pressed against the arc cooling member of the first opening and is cooled strongly. Therefore, even if the arc driving force of the arc extinguishing plate or the like is weak, there is an effect that a switch having excellent breaking performance can be obtained.

According to the eighteenth aspect of the present invention, the second opening is provided in the portion of the connecting conductor portion located below the contact plate of the fixed contact, facing the contact plate. Since the current flowing through the connecting conductors on both sides of the opening is shunted to both sides, the relative distance to the arc is larger than that without the second opening, the force for pushing back the arc is smaller, and the arc is smaller than the first one. It is strongly pressed against the arc cooling member at the opening to be cooled strongly. Therefore, even if the arc driving force of the arc extinguishing plate or the like is weak, there is an effect that a switch having excellent breaking performance can be obtained.

According to the nineteenth aspect of the present invention, the opening of the fixed contact is formed as one opening by connecting the first opening of the rising portion and the second opening facing the contact plate. , The path for splitting and flowing to the connecting conductors on both sides of the opening becomes longer, therefore the force to push back the arc is weakened, the arc is cooled more strongly, and a switch with excellent breaking performance is obtained. There is.

According to the twentieth aspect of the present invention, since the connecting conductor portion below the contact plate is provided with the second opening and the arc runner is provided, the current flowing through the contact plate above the turn-up is the arc. To drive toward the first opening, and the arc runner shields the reverse driving magnetic field by the connecting conductor portion below the contact plate, and the arc easily extends toward the first opening, and , Because it receives strong cooling,
There is an effect that a switch with excellent breaking performance can be obtained.

According to the twenty-first aspect of the invention, since the tip of the arc runner is prevented from coming into contact with the connecting conductor portion, the current flowing through the arc runner causes the arc to flow in the first opening of the rising portion of the connecting conductor portion. It acts so as to press against the arc cooling member of the, so that the arc easily extends in the direction of the first opening of the rising part, and is strongly pressed against the exposed surface of the base to be strongly cooled, so that it has an excellent breaking performance. The effect is obtained.

According to the twenty-second aspect of the present invention, a part of the arc runner is inserted between the contact plate and the connecting conductor portion facing the contact plate, so that the current flowing through the connecting conductor portion below the contact plate is reduced. Shields the magnetic field generated by and suppresses the force that pushes back the arc. Therefore, the arc is pressed against the arc cooling member in the first opening, so that the arc tends to extend toward the first opening, and the arc spot is near the base in the first opening. Since it is cooled by a large amount of pyrolysis gas from the base, there is an effect that a switch with excellent blocking performance can be obtained.

According to the twenty-third aspect of the invention, since the tip of the arc runner is inserted into the first opening, the arc spot on the fixed contact side and the arc cooling member in the first opening are provided. Since the distance can be made smaller and the action of cooling the arc is further improved, there is an effect that a switch having excellent breaking performance can be obtained.

According to the twenty-fourth aspect of the present invention, the current of the folded contact plate acts so as to press the arc toward the arc cooling member of the first opening, and the second opening of the connecting conductor portion below the contact plate. The current of the connecting conductors on both sides of the part acts to push back the arc, but it is shielded by the arc runner to weaken the pushing back force of the arc, and the arc runner is the connecting conductor part in the vicinity where the contact plate and the connecting conductor part are connected. Since it is attached to the arc conductor and is not in electrical contact with the connecting conductor except for this attaching part, the current flowing through the arc runner at the time of interruption acts to press the arc against the arc cooling member of the first opening, and Since the tip of the arc runner is inserted in the first opening, the distance between the arc spot on the fixed contact side and the arc cooling member in the first opening can be made smaller. Kudeki action is improved to cool the arc. In addition, the driving magnetic field can be generated even at the moment when the arc spot jumps to the arc runner, and the arc is the first
Easily extends in the direction of the opening of the
Since the arc cooling member is strongly cooled because it is easily driven into the opening, there is an effect that a switch having an excellent breaking performance can be obtained.

According to the twenty-fifth aspect of the present invention, the center of gravity of each of the cross sections of the left and right connecting conductors on both sides of the second opening below the contact plate and the center point of the fixed contact surface are formed. Since the base angle of the equilateral triangle is less than 45 degrees, the influence of the electromagnetic force that pushes back the arc can be reduced, and the force that pushes the arc against the arc cooling member of the first opening can be increased. The action of cooling is further improved. Therefore, there is an effect that a switch having an excellent breaking performance can be obtained.

According to the twenty-sixth aspect of the invention, since the shortest distance between the tip of the movable contact and the arc runner is set closer than the shortest distance between the tip of the movable contact and the connecting conductor, the arc is fixed other than the arc runner. Since it is possible to prevent commutation to the part of the contactor and to maintain the electromagnetic force that extends the arc, it is possible to obtain a switch having a reliable and excellent breaking performance in which breaking failure is less likely to occur.

According to the twenty-seventh aspect of the present invention, the electric current of the folded contact plate acts so as to extend the arc toward the terminal portion, and the electric current of the connecting conductors on both sides of the second opening of the connecting conductor portion below the contact plate is increased. The electric current acts to push back the arc, but since the connecting conductor portion is below the turnaround and further has the second opening, the relative distance to the arc becomes large and the force to push back the arc becomes small. Furthermore, it is an isosceles triangle formed from the respective center of gravity of the cross sections of the left and right connecting conductors on both sides of the second opening below the contact plate and the center point of the fixed contact surface, the base angle of which is 45 degrees. Since it is set to be less than, the influence of the magnetic field that pushes back the arc can be reduced, and the force that presses the arc on the arc cooling member of the first opening can be strengthened, so that the action of cooling the arc is further improved. There is an effect that a switch with excellent breaking performance can be obtained.

According to the twenty-eighth aspect of the invention, since the insulator is inserted at least between the contact plate and the connecting conductor portion near the second opening, an arc is generated on the connecting conductor portion from the fixed contact when the current is cut off. The arc is cooled by the thermal decomposition gas of this insulator without flying, and there is an effect that a switch with excellent breaking performance can be obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view and side view showing a circuit breaker according to a first embodiment of the present invention.

2A and 2B are a front view and a side view showing a positional relationship between a movable contactor, a fixed contactor and a kerf of FIG.

FIG. 3 is a perspective view of the fixed contactor of FIG.

4 is an explanatory diagram of a magnetic field strength distribution generated by a current flowing through conductors on the left and right of a kerf of the fixed contact of FIG.

FIG. 5 is a side view of an essential part of the circuit breaker according to the first embodiment of the present invention.

FIG. 6 is a perspective view of a fixed contact according to a second embodiment of the present invention.

FIG. 7 is a side view of a main part of a circuit breaker according to a third embodiment of the present invention.

8 is a perspective view of the fixed contactor of FIG. 7. FIG.

FIG. 9 is a perspective view of a main part of a circuit breaker according to a fourth embodiment of the present invention.

FIG. 10 is a side view of a main part of a circuit breaker according to a fifth embodiment of the present invention.

FIG. 11 is a side view of a main part of a circuit breaker according to a sixth embodiment of the present invention.

FIG. 12 is a perspective view of a cooling plate according to a seventh embodiment of the present invention.

FIG. 13 is a perspective view of a laminated cooling plate according to Embodiment 8 of the present invention.

FIG. 14 is a side view of a main part of a circuit breaker according to a ninth embodiment of the present invention.

FIG. 15 is a perspective view of the fixed contactor of FIG.

FIG. 16 is a perspective view and a sectional view of a fixed contact according to a tenth embodiment of the present invention.

FIG. 17 is a side view of essential parts of a circuit breaker according to an eleventh embodiment of the present invention.

18 is a perspective view of the fixed contact of FIG.

FIG. 19 is a schematic view of the appearance of an arc generated between opposing electrodes in a magnetic field.

FIG. 20 is a side view of a main part of a circuit breaker according to a twelfth embodiment of the present invention.

21 is a perspective view of the fixed contactor of FIG. 20. FIG.

FIG. 22 is a perspective view of a fixed contact according to Embodiment 13 of the present invention.

FIG. 23 is a perspective view of a fixed contact according to Embodiment 13 of the present invention.

FIG. 24 is a perspective view of a fixed contact according to Embodiment 14 of the present invention.

FIG. 25 is a side view of essential parts of a circuit breaker according to Embodiment 15 of the present invention.

FIG. 26 is a perspective view of the fixed contactor of FIG. 25.

27 is a perspective view of the fixed contactor of FIG. 25. FIG.

FIG. 28 is a perspective view of a fixed contact according to Embodiment 16 of the present invention.

FIG. 29 is a perspective view of a fixed contact according to Embodiment 17 of the present invention.

FIG. 30 is a side view of essential parts of a circuit breaker according to Embodiment 18 of the present invention.

FIG. 31 is a side view of essential parts of a circuit breaker according to Embodiment 19 of the present invention.

FIG. 32 is a side view of essential parts of a circuit breaker according to Embodiment 19 of the present invention.

FIG. 33 is a side view of essential parts of a circuit breaker according to Embodiment 20 of the present invention.

FIG. 34 is a side view of essential parts of a circuit breaker according to Embodiment 21 of the present invention.

FIG. 35 is a front view and a side view of a main part of a circuit breaker according to a twenty-second embodiment of the present invention.

FIG. 36 is a front view and a side view of a main part of a circuit breaker according to a twenty-third embodiment of the present invention.

FIG. 37 is a perspective view of essential parts of a circuit breaker according to Embodiment 24 of the present invention.

FIG. 38 is a front view of the essential parts of a circuit breaker according to a twenty-fifth embodiment of the present invention.

FIG. 39 is a side view of essential parts of a circuit breaker according to a twenty-fifth embodiment of the present invention.

FIG. 40 is a front view of the essential parts of a circuit breaker according to Embodiment 26 of the present invention.

41 is a side view of FIG. 40. FIG.

42 is a side view of the essential parts of a circuit breaker according to Embodiment 27 of the present invention. FIG.

FIG. 43 is a perspective view of a movable contactor and a fixed contactor according to Embodiment 28 of the invention.

FIG. 44 is a perspective view of a movable contactor according to Embodiment 29 of the invention.

FIG. 45 is a perspective view of a movable contactor according to Embodiment 30 of the present invention.

FIG. 46 is a side view of essential parts of a circuit breaker according to Embodiment 31 of the present invention.

47 is a side view of the essential parts of a circuit breaker according to Embodiment 31 of the present invention. FIG.

48 is a side view of the essential parts of a circuit breaker according to Embodiment 31 of the present invention. FIG.

FIG. 49 is a side view of the essential portions of the circuit breaker according to the thirty-second embodiment of the present invention.

50 is a side view of the essential parts of a circuit breaker according to Embodiment 33 of the present invention. FIG.

FIG. 51 is a perspective view of essential parts of a circuit breaker according to Embodiment 34 of the present invention.

52 is a side view of essential parts of a circuit breaker according to Embodiment 35 of the present invention. FIG.

53 is a side view of the essential parts of a circuit breaker according to a thirty-sixth embodiment of the present invention. FIG.

FIG. 54 is a plan view of the fixed contact according to Embodiment 37 of the present invention.

55 is a cross-sectional view of the fixed contactor of FIG. 54.

FIG. 56 is a side view of the essential portions of the circuit breaker according to the thirty-seventh embodiment of the present invention.

FIG. 57 is a side view of the essential portions of the circuit breaker according to the thirty-seventh embodiment of the present invention.

58 is an explanatory diagram showing a cross section of FIG. 57. FIG.

FIG. 59 is a side view of essential parts of a circuit breaker according to embodiment 38 of the present invention.

60 is a cross-sectional view of the main parts of the circuit breaker of FIG. 59.

FIG. 61 is a perspective view of a fixed contact of a circuit breaker according to Embodiment 39 of the present invention.

FIG. 62 is a sectional view of a fixed contact, showing another modification of the 39th embodiment of the present invention.

FIG. 63 is a side view of the essential portions of the circuit breaker according to the fortieth embodiment of the present invention.

FIG. 64 is a perspective view of a fixed contact showing another modified example according to the fortieth embodiment of the present invention.

65A and 65B are a side view and a perspective view of a main part of a circuit breaker according to a forty-first embodiment of the present invention.

FIG. 66 is a perspective view of a fixed contact showing another modified example of the forty-first embodiment of the invention.

67 is a side view of the essential portions of a circuit breaker according to Embodiment 42 of the present invention. FIG.

FIG. 68 is an operation explanatory view showing the time of current interruption of the circuit breaker according to embodiment 42 of the present invention;

FIG. 69 is a perspective view of a fixed contact according to Embodiment 43 of the present invention.

70 is an operation explanatory view showing the cross section of FIG. 69; FIG.

71 is a side view of essential parts of a circuit breaker according to Embodiment 43 of the present invention. FIG.

72 is a plan view of the fixed contact according to Embodiment 44 of the present invention. FIG.

FIG. 73 is a sectional view of a fixed contact showing another modification according to the forty-fourth embodiment of the present invention.

FIG. 74 is a side view and a sectional view of a fixed contact according to Embodiment 45 of the present invention.

FIG. 75 is a side view of the fixed contact according to embodiment 46 of the present invention.

76 is a plan view of the fixed contact of FIG. 75. FIG.

FIG. 77 is a side view of a fixed contact according to another modification of the forty-sixth embodiment of the present invention.

FIG. 78 is a side view of the fixed contact according to embodiment 47 of the present invention.

79A and 79B are a plan view and a side view of a fixed contact according to Embodiment 48 of the present invention.

FIG. 80 is a perspective view of a fixed contact according to Embodiment 49 of the present invention.

81 is a cross-sectional view of the fixed contactor of FIG. 80.

FIG. 82 is a perspective view of a fixed contact according to Embodiment 50 of the present invention.

FIG. 83 is a perspective view of a fixed contact showing another modification according to the embodiment 50 of the present invention.

FIG. 84 is a perspective view of a fixed contact according to Embodiment 51 of the present invention.

FIG. 85 is a trihedral view of the arc runner of the fixed contact according to embodiment 51 of the present invention.

FIG. 86 is a perspective view of a fixed contact according to embodiment 52 of the present invention.

87 is a cross-sectional view of the fixed contact of FIG. 86.

88 is a side view of the fixed contact according to Embodiment 53 of the present invention. FIG.

FIG. 89 is a side view of a fixed contact according to another modification of the 53rd embodiment of the present invention.

FIG. 90 is a side view of the fixed contact according to Embodiment 54 of the present invention.

FIG. 91 is a side view of a fixed contact according to another modification of the 54th embodiment of the present invention.

FIG. 92 is a side view of a fixed contact, showing another modified example according to the 54th embodiment of the present invention.

FIG. 93 is a side view of the fixed contact according to embodiment 55 of the present invention.

FIG. 94 is a plan view of a fixed contact according to Embodiment 55 of the present invention.

FIG. 95 is a plan view, a side view, and a bottom view of a fixed contact according to Embodiment 56 of the present invention.

96 is a perspective view of a fixed contact according to Embodiment 57 of the present invention. FIG.

FIG. 97 is a perspective view of a fixed contact, showing another modification of the embodiment 57 of the invention.

FIG. 98 is a perspective view of a fixed contact according to Embodiment 58 of the present invention.

99 is an operation explanatory view showing a cross section of the fixed contactor of FIG. 98. FIG.

100 is a graph showing the magnitude of the reverse driving magnetic field on the fixed contact of FIG. 98. FIG.

101 is a side view of essential parts of a circuit breaker according to Embodiment 59 of the present invention. FIG.

FIG. 102 is an operation explanatory view showing the time of current interruption of the circuit breaker according to embodiment 59 of the present invention.

103 is an operation explanatory view at the moment when the arc moves to the terminal portion at the time of interrupting the current of the circuit breaker according to Embodiment 59 of the present invention. FIG.

FIG. 104 is a side view of a main portion of a circuit breaker according to an embodiment 60 of the present invention.

FIG. 105 is a side view of the essential parts showing a modified example of the sixtieth embodiment of the present invention.

106A and 106B are a side view and a plan view of a main part showing another modified example according to example 60 of the invention.

FIG. 107 is a side view and a plan view of a main part of a circuit breaker according to a working example 61 of the invention.

FIG. 108 is a plan view and a sectional view of a kerf according to an embodiment 62 of the present invention.

109 is a perspective view and a sectional view of a kerf according to Embodiment 62 of the present invention. FIG.

110 is a side view of a kerf fixed contact according to Embodiment 62 of the present invention; FIG.

111 is a plan view of a kerf according to Embodiment 62 of the present invention. FIG.

FIG. 112 is a side view of the fixed contact according to embodiment 63 of the present invention.

FIG. 113 is a side view of the fixed contact according to embodiment 63 of the present invention.

FIG. 114 is a side view of the essential portions of the circuit breaker according to embodiment 64 of the present invention.

FIG. 115 is a plan view of the fixed contact according to Embodiment 64 of the present invention.

FIG. 116 is an operation explanatory view showing the cross section of the fixed contactor of FIG. 115;

FIG. 117 is an operation explanatory view showing the time of current interruption of the circuit breaker according to embodiment 64 of the present invention;

FIG. 118 is an operation explanatory view showing the cross section of the fixed contactor of FIG. 117;

FIG. 119 is a graph showing the magnitude of a magnetic field on the fixed contact of FIG. 117.

FIG. 120 is a perspective view of a fixed contact showing a modified example according to the sixty-fourth embodiment of the present invention.

121 is a side view of essential parts of a circuit breaker according to Embodiment 65 of the present invention. FIG.

FIG. 122 is a plan view of a fixed contact showing another modified example according to the sixty-fifth embodiment of the present invention.

123 is a side view of the fixed contact according to Embodiment 66 of the present invention. FIG.

FIG. 124 is a plan view of the fixed contact shown in FIG. 123.

125 is a cross-sectional view of the fixed contact of FIG. 124.

FIG. 126 is a side view of the fixed contact according to embodiment 67 of the present invention.

127 is a cross-sectional view of the fixed contact of FIG. 126.

FIG. 128 is a sectional view of a fixed contact showing another modification of the 67th embodiment of the present invention.

FIG. 129 is a side view showing a conventional circuit breaker when opened.

FIG. 130 is a side view showing a conventional circuit breaker when it is closed.

FIG. 131 is a side view showing a state where the current of the conventional circuit breaker is cut off.

FIG. 132 is an explanatory diagram of generation of a driving magnetic field by a fixed contactor at the time of current interruption of a conventional circuit breaker.

FIG. 133 is an explanatory diagram showing a positional relationship of electrode portions of a conventional circuit breaker.

FIG. 134 is an explanatory diagram showing a reverse drive magnetic field generated by the fixed contactor when the current of the conventional circuit breaker is interrupted.

FIG. 135 is an explanatory diagram showing a cross section of FIG. 134.

[Explanation of symbols]

 1 movable contact 2 movable contact 3 fixed contact 4 fixed contact 5 contact plate 6 terminal part 7 connection conductor (connection conductor part) 7a. 7b Connection conductor 20 Cut groove (1st opening part) 21 Arc runner 22 Arc horn 23 Cooling plate (arc cooling member) 36 Cut groove (2nd opening part) 64 Insulator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazunori Fukuya 1-8 Midoricho, Fukuyama City Mitsubishi Electric Corporation Fukuyama Works (72) Inventor Yasuo Kishimoto 1-8 Midoricho, Fukuyama City Mitsubishi Electric Engineer Ring Himeji Co., Ltd. Fukuyama branch office

Claims (28)

[Claims] 1. A movable contact having a movable contact and a fixed contact which can be brought into contact with and separated from the movable contact by an opening / closing operation of the movable contact are provided at one end, and from this one end through a connecting conductor. In a switch provided with a fixed contactor having an end portion as a terminal portion, the connection conductor portion has a rising portion facing a movement line where the movable contact and the fixed contact come into contact with each other, and the rising portion A switch which is provided with a first opening opposed to the operation line. 2. The base for holding an arc cooling member or a switch main body as an arc cooling member is provided inside a first opening provided in a rising portion of a connecting conductor portion. Switch which is characterized by doing. 3. The switch according to claim 2, further comprising an arc runner extending from the vicinity of the fixed contact of the fixed contact to the first opening. 4. The switch according to claim 3, wherein the tip of the arc runner faces downward when the direction in which the movable contact separates from the fixed contact is upward. 5. When the movable contact is separated from the fixed contact in the upward direction according to claim 3, the tip of the arc runner is directed upward, and the tip and the movable contact including the movable contact are arranged. It is arranged such that the shortest distance is smaller than the shortest distance between the movable contact including the movable contact and the rising portion of the connection conductor portion of the fixed contact at the position of the movable contact at the shortest distance. Switch to be. 6. The method according to any one of claims 3 to 5,
A switch characterized in that the width of at least the tip of the arc runner is made narrower than the width of the first opening of the connecting conductor. 7. The switch according to claim 3, wherein the tip of the arc runner is configured to be inserted into the first opening. 8. The switch according to claim 7, wherein a cross-sectional area of a fixed contact side portion of the arc runner is larger than a cross-sectional area of a tip portion of the arc runner. 9. The switch according to claim 3, wherein the tip end portion of the arc runner is configured to penetrate through the first opening portion. 10. The arc runner according to claim 3, wherein when the movable contact is separated from the fixed contact in an upward direction, the arc runner is inserted into the first opening and bent upward, and a tip portion of the arc runner is moved upward. A switch which is configured to project upward from the inside of the opening of No. 1. 11. The arc horn according to claim 2, wherein the arc horn extends from the vicinity of the movable contact of the movable contactor toward the first opening at the closed position of the movable contact. Switch. 12. The switch according to claim 11, wherein the tip of the arc horn is inserted into the first opening when the movable contact is closed. 13. The movable contact of the movable contact according to claim 2, further comprising an arc runner extending from the vicinity of the fixed contact of the fixed contact toward the first opening, and at the closed position of the movable contact. A switch provided with an arc horn that extends from the vicinity of the first opening toward the first opening. 14. The arc runner according to claim 13, wherein the tip of the arc runner is inserted into the first opening, and the tip of the arc horn comes into the first opening when the movable contact is closed. A switch characterized by being configured to be inserted. 15. The tip of the arc runner according to claim 13, wherein the tip of the arc runner is located in front of the first opening, and the tip of the arc horn is the first opening when the movable contact is closed. A switch which is inserted into the switch and is separated from the first opening when the movable contact is opened. 16. The switch according to claim 1, wherein an insulator is provided to insulate at least a side of the connection conductor portion around the first opening facing the movable contact. 17. The fixed contact according to claim 1 or 2, wherein the movable contact has a direction in which the fixed contact separates from the fixed contact, and the fixed contact has a fixed contact mounting side folded back upward.
A switch which is configured such that a fixed contact is attached using the folded portion as a contact plate. 18. The fixed contact according to claim 17,
A switch, wherein a second opening is provided in a portion of the connection conductor portion located below the contact plate, the portion facing the contact plate. 19. The switch according to claim 18, wherein the fixed contact has an opening formed by connecting the first opening and the second opening to form one opening. 20. In claim 2, when the direction in which the movable contact separates from the fixed contact is upward, the fixed contact has its fixed contact mounting side folded back upward, and the folded portion serves as a contact plate. A fixed contact is attached, and a second opening is provided in a portion of the connecting conductor portion located below the contact plate, the part facing the contact plate, and an arc runner is provided. A switch which is an arc runner made of a magnetic material whose tip extends toward the first opening and which covers at least the lower connection conductor of the contact plate. . 21. The switch according to claim 20, wherein the tip end portion of the arc runner is configured so as not to come into electrical contact with the connection conductor portion. 22. The opening / closing according to claim 20, wherein the arc runner is configured such that a part of the arc runner is inserted between the contact plate and a connecting conductor portion below the contact plate. vessel. 23. The switch according to claim 20, wherein the tip end of the arc runner is configured to be inserted into the first opening. 24. When the movable contact separates from the fixed contact in the upward direction according to claim 2, the fixed contact has its fixed contact mounting side folded back upward, and the folded portion serves as a contact plate. A fixed contact is attached, a second opening is provided in a portion of the connecting conductor portion located below the contact plate, the portion facing the contact plate, and an arc runner made of a substantially U-shaped magnetic body is provided. Runner
The U-shaped leg portion is arranged so as to cover the lower connection conductor portion of the contact plate, and the tip portion of the U-shaped leg portion is connected near the contact plate and the connection conductor portion. The arc runner is attached to the conductor portion so that the arc runner does not come into electrical contact with the connecting conductor portion other than the attachment portion to which the arc runner is attached, and the tip end portion of the arc runner that hits the U-shaped bottom portion is the first A switch which is configured to be inserted into an opening. 25. The stationary contact and the stationary contact according to claim 18, wherein the center of gravity of each of the cross sections of the left and right connecting conductors on both sides of the second opening and the stationary contact. Isosceles triangle formed from the center point of the surface,
A switch which is arranged such that its base angle is less than 45 degrees. 26. The arc runner according to claim 20, wherein the tip of the arc runner is bent upward,
The shortest distance between the tip and the movable contact including the movable contact is such that, at the position of the movable contact at this shortest distance, the movable contact including the movable contact and the rising portion of the connection conductor portion of the fixed contact. A switch which is arranged so as to be smaller than the shortest distance. 27. A movable contact having a movable contact and a fixed contact which can be brought into contact with and separated from the movable contact by an opening / closing operation of the movable contact are provided at one end, and from this one end through a connection conductor portion and the like. In a switch equipped with a fixed contactor having an end portion as a terminal portion, when the direction in which the movable contact separates from the fixed contact is set to the upper side, the fixed contact is designed so that the fixed contact mounting side is folded back upward. A fixed contact is mounted using the folded portion as a contact plate, and a second portion is provided at a portion of the connection conductor portion located below the contact plate and facing the contact plate.
And an isosceles triangle formed from the center of gravity of each of the cross sections of the left and right connecting conductors on both sides of the second opening and the center of the fixed contact surface, the bottom of which is A switch which is a fixed contact arranged so that the angle is less than 45 degrees. 28. The switch according to claim 27, wherein an insulator is inserted at least between the contact plate and the connection conductor portion near the second opening.