JPH09293421A - Arc-extinguishing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arc-extinguishing device enhancing arc-extinguishing performance by applying a strong magnetic field to an arc. SOLUTION: This device comprises a coil 1 formed in almost a U shape by a first/second opposed piece 12, 13 of a plate-shaped conductor opposed to be protrusively provided from a central piece 11 and its both ends to generate a magnetic field by carrying a current, terminal plate 2 extended from a tip end of the first opposed piece 12, fixed contact plate 3 extended from a tip end of the second opposed piece 13 to a side of the first opposed piece 12 to provided a fixed contact 31 in the tip end part and a movable contact plate 4 providing in a tip end part a movable contact turned with a turn shaft positioned in a side of a base end part 3a of the fixed contact plate 3 serving as the center to make contact/separation with/from the fixed contact 31 in a U-shaped inside 1a of the coil 1. Here, in this constitution, the first opposed piece 12 is longer than the second opposed piece 13, the fixed contact plate 3 is extended from a tip end 13a of the second opposed piece 13 toward a direction of the U-shaped inside 1a of the coil 1 from a perpendicular lowered down to the first opposed piece 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc extinguishing device built in a circuit breaker or the like for protecting an electric circuit or an external electric device from a short circuit accident or the like.

[0002]

2. Description of the Related Art Conventionally, as an arc extinguishing device of this type, FIG.
And the configuration shown in FIG. 32 exists. This one is
A coil, which is a plate-shaped conductor, is formed in a substantially U shape by a central piece A1, and a first opposing piece A2 and a second opposing piece A3 that project from both ends of the central piece A1 and face each other, and generate a magnetic field by energization. A
A terminal plate B extending from the tip of the first facing piece A2 and connected to an external electric path; and a fixed contact at the tip of the terminal board B extending from the tip of the second facing piece A3 to the first facing piece A2 side. Movable to rotate around a fixed contact plate C provided with C1 and a rotation axis D located on the base end side of the fixed contact plate C to come in contact with and separate from the fixed contact C1 inside the U-shape of the coil A. And a movable contact plate E having a contact E1 at its tip.

More specifically, the electric current is supplied to the movable contact plate E through the terminal plate B, the coil A, the fixed contact plate C, the fixed contact C1 and the movable contact E1 which are connected to the external electric path. When a short-circuit accident occurs in an external electric circuit or an external device, a short-circuit current is applied and the mechanical section (not shown)
The movable contact E1 is opened by the action of.

At this time, when the short-circuit current flowing in the coil A is applied, the magnetic field is moved inside the coil A so that the movable contact plate E can move.
Occurs in the direction perpendicular to the plane of rotation of the. This magnetic field
A force in the direction that separates the movable contact E1 inside the U-shaped coil A, that is, a Lorentz force, is generated in the movable contact plate E and contributes to an increase in the opening speed of the movable contact E1. Also,
Due to this magnetic field, the arc generated between the fixed contact C1 and the movable contact E1 receives the force of moving in the direction of the terminal board B, that is, the Lorentz force. With this force, the arc is stretched and the arc voltage rises. Then, the arc is guided into the grid F, and the arc voltage is further increased by the cooling effect and the extension effect of the arc.

However, in this case, the first facing piece A2 has the same length as the second facing piece A3, and the fixed contact plate C has the second length.
It is not extended toward the U-shaped inward direction of the coil A from the perpendicular line drawn from the tip of the facing piece A3 to the first facing piece A2.

Further, the plate thickness directions of the central piece A and the second facing piece A3 are horizontal to the rotating surface of the movable contact plate E. In addition, the outlet for the high-temperature gas generated by the arc is formed by a rectangular hole (not shown) provided in the coil A so as to maintain the strength of the coil A and suppress the heat generation of the electric path when energized. In order to make the hole smaller or coil A
It is provided with a large width.

Further, the fixed contact C1 is joined to the fixed contact plate C, and is bent to form the fixed contact plate C, the coil A and the terminal plate B. In this case, the fixed contact C1 may be peeled off or the surface of the fixed contact C1 may be damaged during the bending process.

[0008]

In the above-described conventional arc extinguishing device, the arc generated between the contacts can be driven by the magnetic field of the coil A to extinguish the arc.

However, in order to obtain high arc extinguishing performance, immediately after the movable contact E1 is separated from the fixed contact C1, the opening speed of the movable contact E1 is increased so as to sharply raise the arc voltage of the generated arc. In addition, it is necessary to apply a strong magnetic field to the arc generated between the contacts.

The present invention has been made in view of the above circumstances, and its object is to increase the contact opening speed and to apply a strong magnetic field to the arc between the contacts immediately after opening. , To provide an arc extinguishing device with improved arc extinguishing performance.

[0011]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, a plate-shaped conductor is provided with a central piece and a first facing piece projecting from both ends of the central piece and facing each other. And a second opposing piece formed in a substantially U-shape to generate a magnetic field when energized, a terminal plate extending from the tip of the first opposing piece and connected to an external electric path, and a second opposing piece First from the tip of
Fixed contact plate that extends to the opposite side and has a fixed contact at the tip, and a rotating shaft located at the base end side of the fixed contact plate that rotates around the U-shaped inside of the coil A movable contact plate provided with a movable contact at a tip end thereof for contacting and separating the contact, and an arc extinguishing device for extinguishing an arc generated between the contacts by driving with a magnetic field of a coil. A configuration in which the fixed contact plate is longer than the second opposing piece and extends toward the U-shaped inner side of the coil from a perpendicular line drawn from the tip of the second opposing piece to the first opposing piece. I am doing it.

According to a second aspect of the present invention, in the first aspect, the fixed contact plate is arranged so as to extend substantially parallel to the first facing piece through an intermediate piece.

According to a third aspect of the present invention, in the first aspect, the fixed contact plate is configured to extend substantially parallel to a part or all of the central piece.

According to a fourth aspect of the present invention, in the first aspect, the movable contact plate is formed so as to rotate from the U-shaped inside of the coil to the outside.

According to a fifth aspect of the present invention, in the first aspect, the plate thickness direction of the second facing piece or the center piece and the second facing piece is the rotating surface of the movable contact plate. In contrast, it is formed vertically.

According to a sixth aspect of the present invention, in the first aspect, the plate thickness direction of at least one of the central piece and the first facing piece is formed perpendicular to the rotating surface. It has a different structure.

According to a seventh aspect, in the first aspect, the plate thickness direction of the central piece, the first facing piece and the second facing piece is relative to the rotating surface of the movable contact plate. And is formed vertically.

According to an eighth aspect, in the first aspect, each of the central piece, the first facing piece, the second facing piece and the terminal plate is orthogonal to a contact surface of the fixed contact. It is configured to have a space in the direction.

According to a ninth aspect, in the first aspect, the central piece, the first facing piece, or the second piece.
At least one of the facing pieces is covered with an insulating material.

According to a tenth aspect of the present invention, in the first aspect, each of the fixed contact plate and the movable contact plate is provided with an arc traveling plate on which the arc travels and extends from the tip portion. It is configured to be provided.

According to an eleventh aspect of the present invention, in the tenth aspect of the present invention, each of the arc running plates has a cutout portion extending in an extending direction from an arc sticking position where the arc sticks to a contact end. Each has its own configuration.

According to a twelfth aspect of the present invention, according to the first aspect of the present invention, the fixed wall and the shielding wall that is substantially orthogonal to the fixed wall and shields the gas when the arc is generated are the fixed contacts of the central piece. An air passage provided on the opposite side to the plate side and on the opposite side of the movable contact plate to the fixed contact plate side, and communicating with the U-shaped inside is provided between the shield wall and the second facing piece. It has a special structure.

According to a thirteenth aspect of the present invention, according to the twelfth aspect, the shielding wall is formed by an operation handle for bringing the movable contact into and out of contact with the fixed contact.

According to a fourteenth aspect, in the twelfth aspect, a partition having a gap of a predetermined size between each of the fixed wall and the shielding wall is a partition wall on the second opposing side of the ventilation passage. It has a structure provided to the.

According to a fifteenth aspect, in the twelfth or fourteenth aspect, at least one of the shielding wall and the partition wall is made of a magnetic material.

According to a sixteenth aspect, in the twelfth or fourteenth aspect, at least one of the shielding wall and the partition wall is made of an insulator or a structure covered with an insulator.

According to a seventeenth aspect of the present invention, in the first aspect, the fixed contact plate is configured such that a magnetic piece having a small magnetic resistance is provided at the fixed contact position.

According to a eighteenth aspect, in the seventeenth aspect, the magnetic piece is formed in a substantially L-shape in which one piece is in contact with an opposite side of the fixed contact plate to the fixed contact. I am doing it.

According to a nineteenth aspect, in the seventeenth aspect, the magnetic piece is formed so as to be located on the terminal plate side of the central piece.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a coil, which is made of a plate-shaped conductor made of copper or a copper alloy, and is composed of a central piece 11 and a first opposing piece 12 and a second opposing piece 13 which project from both ends of the central piece 11 and face each other. The first facing piece 12 is formed in a substantially U shape, and the second facing piece 13 is formed.
For a longer time, a magnetic field is generated in the U-shaped inside 1a by energization.

Reference numeral 2 denotes a terminal plate, which is made of a plate-shaped conductor made of copper or copper alloy and extends from the tip of the first facing piece 12 of the coil 1 to the outside of the U-shape and is connected to an external electric circuit.

Reference numeral 3 denotes a fixed contact plate, which is made of a plate-shaped conductor made of copper or a copper alloy and is formed by a tip 1 of the second facing piece 13 of the coil 1.
3a toward the first facing piece 12 side, and extending toward the U-shaped inner side 1a direction of the coil 1 from the perpendicular drawn from the tip 13a of the second facing piece 13 to the first facing piece 12, A fixed contact 31 made of silver or a silver alloy is provided on the portion.

Reference numeral 4 is a movable contact plate, which is a first link 4 whose base end is a mechanical part made of a plate-shaped conductor made of copper or copper alloy.
A movable contact 43 made of silver or a silver alloy is provided at the tip of the movable contact 43, which is connected to the fixed contact plate 3 and rotates about a rotation shaft 42 located on the base end 3a side of the fixed contact plate 3. Contacts and separates from the fixed contact 31 at the U-shaped inner side 1 a of the coil 1.

The operation of this one will be described. When a short-circuit accident occurs in an external electric circuit or an external device, the short-circuit current is the first of the terminal plate 2 and the coil 1 connected to the external electric circuit.
The movable contact plate 4 is energized via the facing piece 12, the central piece 11, the second facing piece 13, the fixed contact plate 3, the fixed contact 31, and the movable contact 43. Further, the load side terminal plate 10c is energized via the braided wire 10a connected to the movable contact plate 4 and the bimetal 10b. Where bimetal 1
The magnetic attraction of the U-shaped yokes 10d provided on both sides of 0b causes the tip of the bimetal 10b to be displaced to the second position.
The link 10e operates and the latch between the second link 10e and the third link 10f is released.

Next, the first link 41 to which the movable contact plate 4 is connected, that is, the movable contact plate 4 rotates about the rotation shaft 42 on the U-shaped inner side 1a of the coil 1, The movable contact 43 is separated from the fixed contact 31 at a substantially central portion of the U-shaped inside 1a. Further, the movable contact plate 4 rotates from the U-shaped inside 1 a of the coil 1 to the outside of the second facing piece 13.

At this time, an arc is generated between the fixed contact 31 and the movable contact 43. Immediately after contact opening, the first facing piece 1
2, a magnetic field is generated in the U-shaped inner side 1a of the coil 1 by a current passing through the central piece 11 and the second facing piece 13, Lorentz force acts on the arc, and the arc is driven to the central piece 11 side. . The magnetic field generated in the U-shaped inner side 1 a of the coil 1 has a substantially central portion in a region surrounded by the first facing piece 12, the central piece 11 and the second facing piece 13, that is, a substantially inner side of the U-shaped inside of the coil 1. Since the central portion is the strongest, this strongest magnetic field acts on the arc, and the arc receives a strong driving force and extends to maintain a high arc voltage.

Further, the movable contact plate 4 receives the electromagnetic repulsive force as in the conventional case, because the energizing direction is opposite to the energizing direction of the fixed contact plate 3. Furthermore, the movable contact plate 4 is fixed to the fixed contact plate 3 by the magnetic field generated inside the U-shaped inside 1a of the coil 1.
Since it rotates about the rotation shaft 42 located on the base end 3a side, the component in the energization direction is opposite to that of the first facing piece 12,
An electromagnetic repulsive force is received between the first facing piece 12 and the first facing piece 12. Similarly,
Due to the magnetic field generated in the U-shaped inner side 1a of the coil 1, the component in the energizing direction is the same as the energizing direction of the second facing piece 13, so that an electromagnetic attractive force is applied between the coil 1 and the second facing piece 13.

Here, the electromagnetic repulsive force and the electromagnetic attractive force cause the movable contact 43 provided at the tip of the movable contact plate 4 to come into contact with and separate from the fixed contact 31 in the U-shaped inner side 1a direction of the coil 1. , The movable contact plate 4 acts in the direction of separating from the fixed contact 31.

That is, the movable contact plate 4 receives an electromagnetic repulsive force and an electromagnetic attractive force by the magnetic field generated in the U-shaped inner side 1a of the coil 1, and the movable contact 43 is separated from the fixed contact 31 at a high speed to cause an arc. The voltage rises sharply.

In the arc-extinguishing device according to the first embodiment, as described above, the fixed contact plate 3 includes the second facing piece 13.
Of the coil 1 from the tip 13a of the coil 1 to the first facing piece 12 longer than the second facing piece 13
That is, since the magnetic field is extended in the direction of the strong magnetic field, a strong magnetic field acts on the arc generated when the movable contact 43 is separated from the fixed contact 31, and the arc receives a strong driving force to expand. The arc voltage can be sharply increased. Further, the movable contact plate 4 receives an electromagnetic repulsive force between the movable contact plate 4 and the first facing piece 12 and an electromagnetic attraction force between the movable contact plate 4 and the second facing piece 13 by the magnetic field generated in the U-shaped inside 1a, and the movable contact plate 4 is moved. The arc voltage can be steeply raised by separating the fixed contact 31 from the fixed contact 31 at a high speed.

Further, since the movable contact plate 4 is formed to rotate from the U-shaped inner side 1a of the coil 1 to the outer side, the coil 1 is downsized and the magnetic field generated in the U-shaped inner side 1a is strengthened. The strong magnetic field can be applied to the arc generated immediately after the contact is opened to give a strong driving force.

In the first embodiment, the central piece 11, the first facing piece 12 and the second facing piece 13 of the coil 1 are formed of one member, but as shown in FIG. At least one may be divided into a plurality of parts and is not limited.

Further, in the first embodiment, the movable contact 43 and the movable contact plate 4, and the fixed contact 31 and the fixed contact plate 3 are separate members, but they may be the same member and are not limited.

A second embodiment of the present invention will be described below with reference to FIGS. Note that in the second embodiment, the first
Functions different from those of the first embodiment will be described, and members having substantially the same functions as those of the first embodiment are designated by the same reference numerals.

Reference numeral 3 denotes a fixed contact plate, which is made of a plate-shaped conductor made of copper or a copper alloy and is formed by a tip 1 of the second facing piece 13 of the coil 1.
3a to the first opposing piece 12 side through the intermediate piece 32, and toward the U-shaped inner side 1a direction of the coil 1 from the perpendicular drawn from the tip 13a of the second opposing piece 13 to the first opposing piece 12. , And extends parallel to the first facing piece 12.

In the arc-extinguishing device of the second embodiment, as described above, the fixed contact plate 3 interposes the intermediate piece,
Since the movable contact plate 4 is extended in parallel with the first facing piece 12 from the tip 13a of the second facing piece 13, the movable contact plate 4 is separated from the first facing piece 12 by the magnetic field generated in the U-shaped inside 1a of the coil 1. In comparison with the non-parallel state, a strong electromagnetic repulsive force is applied to the fixed contact 31 so that the fixed contact 31 can be separated at a high speed, so that the arc voltage can be raised more steeply.

In the second embodiment, the first facing piece 12
The fixed contact plate 3 and the fixed contact plate 3 are parallel to each other. However, as shown in FIG.

FIG. 11 and FIG. 12 show the third embodiment of the present invention.
It will be described below based on. In the third embodiment, the function different from that of the first embodiment will be described.
For members having substantially the same function as the embodiment,
The same reference numerals are given.

Reference numeral 1 denotes a coil, which has a first central piece 11a and a second central piece 11b formed by bending a central piece 11 by a plate-shaped conductor made of copper or a copper alloy. A first facing piece 12 that projects from both ends of the central piece 11 and faces each other.
And the second facing piece 13 are formed in a substantially U shape, and the first facing piece 12 is longer than the second facing piece 13.

Reference numeral 3 is a fixed contact plate, which is made of a plate-shaped conductor made of copper or a copper alloy and is formed by a tip 1 of the second facing piece 13 of the coil 1.
3a toward the first facing piece 12 side, and toward the U-shaped inner side 1a direction of the coil 1 from the perpendicular drawn from the tip 13a of the second facing piece 13 to the first facing piece 12 It extends parallel to the second central piece 11b, which is a part.

In the arc-extinguishing device of the third embodiment, as described above, the fixed contact plate 3 is substantially parallel to the second central piece 11b, which is a part of the central piece 11, and the second facing piece 13 is provided. Since the movable contact plate 4 is extended from the tip 13a of the coil 1, the electromagnetic force generated by the movable contact plate 4 is stronger than that in the state in which the movable contact plate 4 is not parallel to the second central piece 11b due to the magnetic field generated in the U-shaped inner side 1a of the coil 1. In response to this, the fixed contact 31 is disconnected at a high speed, and the arc voltage can be raised more steeply.

In the third embodiment, the fixed contact plate 3
Although the second central piece 11b, which is a part of the central piece 11, is substantially parallel, it may be substantially parallel to the entire central piece 11.
Not limited.

A fourth embodiment of the present invention will be described below with reference to FIG. In the fourth embodiment, functions different from those in the first embodiment will be described, and members having substantially the same functions as those in the first embodiment are denoted by the same reference numerals.

Reference numeral 1 denotes a coil, which is a central piece 11 and its central piece 1.
The first facing piece 12 and the second facing piece 13 that are provided so as to project from both ends and face each other are formed in a substantially U-shape, and the first facing piece 12 is longer than the second facing piece 13. Where the central piece 1
The plate thickness directions of the first and second facing pieces 13 are formed to be perpendicular to the rotating surface of the movable contact plate 4.

The thickness of the arc-extinguishing device depends on the plate width of the movable contact plate 4 and the plate widths of the central piece 11 and the second facing piece 13 of the coil 1 located on the rotating surface of the movable contact plate 4. However, since the plate thickness directions of the central piece 11 and the second facing piece 13 are perpendicular to the rotating surface of the movable contact plate 4, the central piece 11 and the second facing piece are arranged in the direction orthogonal to the rotating surface. This means that the plate thickness is expanded instead of the plate width of 13. On the other hand, as shown in FIG. 7, when the plate thickness direction is horizontal to the rotating surface of the movable contact plate 4, the central piece 11 and the second facing piece 13 are arranged in the direction orthogonal to the rotating surface. The board width will be extended.

The high temperature gas generated by the arc is discharged from the exhaust port. At the exhaust port, when the arc is extended along the flow of exhaust gas, the arc voltage rises,
It must be provided in the traveling direction of the arc, that is, on the side of the center piece 11 or the first facing piece 12 side. Here, since the plate thickness direction of the central piece 11 is perpendicular to the rotating surface of the movable contact plate 4, the hot gas can be applied to the central piece 11 or the first facing piece 12 without providing a hole. It is discharged without being blocked by the plate width of 11.

In the arc-extinguishing device of the fourth embodiment, as described above, the plate thickness direction of the central piece 11 and the second facing piece 13 of the coil 1 located on the rotating surface of the movable contact plate 4 is different. Since it is perpendicular to the rotation surface, not the plate width of the central piece 11 and the second opposing piece 13 but the plate thickness extends in the direction orthogonal to the rotation surface, so that the thickness can be reduced.

Further, since the plate thickness direction of the central piece 11 is perpendicular to the rotating surface of the movable contact plate 4, the high temperature gas generated by the arc is not shielded by the plate width of the central piece 11. When discharged, the central piece 11 or the first facing piece 1
It is possible to form an exhaust port for hot gas on the traveling side of the arc, that is, in the center piece 11, without providing a hole in 2.

In the fourth embodiment, the movable contact plate 4 has the center plate 11 of the coil 1 and the second facing plate 13 in the plate thickness direction.
Although it is formed so as to be perpendicular to the rotating surface of the movable contact plate 4, when only the second facing piece 13 is located on the rotating surface of the movable contact plate 4,
Only the second facing piece 13 may be vertical and is not limited.

Further, the central piece 11 of the coil 1 is formed so that the plate thickness direction thereof is perpendicular to the rotating surface of the movable contact plate 4, and the central piece 11 is provided with an exhaust port. The exhaust port may be formed so that the plate thickness direction of 12 is vertical, and the exhaust port may be provided in the first facing piece 12, but not limited thereto.

The fifth embodiment of the present invention will be described below with reference to FIG. In the fifth embodiment, functions different from those in the first embodiment will be described, and members having substantially the same functions as those in the first embodiment are denoted by the same reference numerals.

Reference numeral 1 is a coil, which is a central piece 11 and its central piece 1.
The first facing piece 12 and the second facing piece 13 that are provided so as to project from both ends and face each other are formed in a substantially U-shape, and the first facing piece 12 is longer than the second facing piece 13. Where the central piece 1
The plate thickness direction of each of the first, first facing piece 12, and second facing piece 13 is formed to be perpendicular to the rotating surface of the movable contact plate 4. Further, a first exhaust port 12a is provided on the first facing piece 12 side and a second exhaust port 11b is provided on the central piece 11 side.

The operation of this one will be described. Fixed contact 31
When the movable contact 43 is separated from the movable contact 43, gas is generated by the arc, and the pressure of the gas inside the U-shaped inside 1a rises. Therefore, the first exhaust port 12a and the second exhaust port located in the traveling direction of the arc. It flows toward 11b. The arc is driven by the gas flow and extends to the exhaust ports 12a, 11b or the outside thereof. Each exhaust port 12a, 11 at two locations
Since b is provided, the arc easily expands as compared with the case where the exhaust port is provided on only one side, and the gas flows in the arc traveling direction, so that the arc easily expands.

In the arc-extinguishing device of the fifth embodiment, as described above, the movable contact plate 4 has the center piece 11, the first facing piece 12, and the second facing piece 13 in the thickness direction.
Since it is formed perpendicularly to the rotation surface of the, the two exhaust ports are provided on the central piece 11 side and the first opposing piece 12 side without forming a hole, that is, in the arc traveling direction, and only on one side. Compared to the case where there is an exhaust port, the arc tends to expand,
The arc voltage can be raised more rapidly, and at the same time, thinning can be achieved.

FIG. 15 and FIG. 16 show the sixth embodiment of the present invention.
It will be described below based on. In the fifth embodiment, functions different from those in the first embodiment will be described.
For members having substantially the same function as the embodiment,
The same reference numerals are given.

The central piece 11 of the coil 1, the first facing piece 12,
Each of the second facing piece 13 and the terminal board 2 has a fixed contact 3
It is provided with a space 31a in the direction orthogonal to the first contact surface. Further, the central piece 11, a part of the first facing piece 12 and the second facing piece 13 are covered with an insulator 5 made of resin or the like.

The conductor is bent to form the terminal plate 2 and the coil 1.
With the first facing piece 12, the central piece 11, the second facing piece 13, and the fixed contact plate 3 formed, a welding electrode for welding the contact or a caulking bar for crimping the contact is placed in the direction perpendicular to the fixed contact 31 surface. It is installed in the space 31a and the fixed contact 31 is joined to the fixed contact plate 3.

In the arc-extinguishing device of the sixth embodiment, as described above, each of the central piece 11, the first facing piece 12, the second facing piece 13 and the terminal plate 2 has the fixed contact 31.
Since it is provided with a space in the direction orthogonal to the contact surface, the conductor is bent to form the terminal plate 2 and the first facing piece 1 of the coil 1.
2, with the central piece 11, the second facing piece 13 and the fixed contact plate 3 formed, a welding electrode or a caulking rod is installed in the space, and the fixed contact 31 is peeled off or scratched on the surface during bending. The fixed contact 31 can be easily joined to the fixed contact plate 3 without sticking.

Further, since the central piece 11, a part of the first facing piece 12 and the second facing piece 13 are covered with the insulator 5 made of resin or the like, the movable contact 43 is separated from the fixed contact 31. The arc generated in the state is the center piece 11 of the coil 1, the first
It is possible to prevent the facing piece 12 and the second facing piece 13 from being entangled.

The seventh embodiment of the present invention will be described with reference to FIGS.
It will be described below based on. In the seventh embodiment, the function different from that of the first embodiment will be described.
For members having substantially the same function as the embodiment,
The same reference numerals are given.

Reference numeral 1 denotes a coil, which is a central piece 11 and its central piece 1.
The first facing piece 12 and the second facing piece 13 which are provided so as to project from both ends of the first facing surface and the second facing piece 13 are formed in a substantially U shape, and the first facing piece 12 is formed longer than the second facing piece 13.

Reference numeral 3 denotes a fixed contact plate, which extends from the tip of the bent second facing piece 13 to the side of the first facing piece 12 and is provided with a fixed contact 31 made of silver or a silver alloy at the tip end thereof. The traveling plate 33 is formed in a substantially L shape, and is provided so as to extend from the tip portion. Further, the cutout portion 33a is provided in the arc traveling plate 33 along the extending direction from the arc sticking position 31b of the fixed contact 31. This will be described later in detail.

A movable contact plate 4 is provided with a movable contact 43 made of silver or silver alloy at its tip, and the arc traveling plate 44 is substantially L.
It is formed in a V shape and is provided extending from the tip.
Further, a cutout portion 44 a is provided on the arc traveling plate 44 along the extending direction from the arc sticking position 43 a on the movable contact 43.

The operation of this product will be described. The movable contact 43 is separated from the fixed contact 31 by the application of the short-circuit current,
As shown in FIG. 18, the arcs generated at the fixed contact 31 receive the driving forces in the directions orthogonal to each other by the magnetic fields Bx and By generated from the second facing piece 13. Therefore, the arc, which was in the substantially central portion of the fixed contact 31 immediately after the separation, travels, and its foot is located at the arc sticking position 31b at the tip of the fixed contact 31 opposite to the second facing piece 13.
Then, it is fixed and stuck.

As the contacts 31 and 43 are separated, as shown in FIG.
As shown in 9, the stale arc elongates. here,
Since the arc traveling plate 33 is provided on the fixed contact plate 3 and the notch 33a is provided along the extending direction of the arc traveling plate from the arc sticking position 31b, the notch 33 is formed.
The base end of a is located at the center of the high temperature arc. Therefore, the heat of the arc is concentrated on the base end of the cutout portion 33a, and the temperature of the arc rises to facilitate the emission of electrons. Following the section, it moves along the corner in the direction of extension.

The same applies to the movable contact 43, and the arc is stuck at the arc sticking position 43a located on the opposite side of the second facing piece 13 at the tip of the movable contact 43, and the arc foot is notched 33a. Then, it moves in the extending direction along the corner after the base end of the.

In the arc-extinguishing device of the seventh embodiment, as described above, the arc traveling plates 33 and 44 are provided so as to extend from the respective tip portions of the fixed contact plate 3 and the movable contact plate 4. Therefore, compared with the case where the arc traveling plate is not provided, the arc generated between the contacts travels at a higher speed along the arc traveling plates 33 and 44, and the arc voltage can be sharply raised. it can.

Further, the cutout portions 33a, 44a are attached to the arc traveling plates 33, 44 at the arc sticking positions 31b, 43.
Since the arc is driven in the driving direction and the foot is fixed and glued at the glued positions 31b and 43a of the contact tip portions, the cutout portions 33a and 44a are glued. Since the base end of the arc is located at the center of the arc with high temperature, the temperature rises and electrons are emitted, and the electric field concentrates on the corner, and the arc foot continues to the base and The arc can travel at a higher speed by moving along the section in the extending direction.

In the seventh embodiment, each of the central piece 11, the first facing piece 12 and the second facing piece 13 of the coil 1 is formed as one piece, but as shown in FIGS.
Each may be formed of two pieces. in this way,
From each tip 13a of the pair of second facing pieces 13
When the fixed contact plate 3 is provided so as to extend toward the facing piece 12 side, the arc receives a driving force from each of the pair of second facing pieces 13 and is applied to the substantially central portion of the fixed contact 31 immediately after the opening. The existing arc runs, and its foot is fixed and sticks at another arc sticking position 31c located at the center of the tip of the fixed contact 31. The same applies to the movable contact 43, and accordingly, the cutout portions 33a and 44a extend from the different arc sticking positions in the extending direction to the respective arc traveling plates 3a.
There is no limitation as long as they are provided in the central portions of 3, 44 respectively.

FIG. 23 to FIG. 28 show the eighth embodiment of the present invention.
It will be described below based on. Note that in the eighth embodiment, functions different from those in the seventh embodiment will be described.
For members having substantially the same function as the embodiment,
The same reference numerals are given.

Reference numeral 6 denotes a fixed wall, which is made of insulating resin and has a plate shape. The central wall 11 is provided on the opposite side of the fixed contact plate 3 from the bottom portion of the base, and the first facing piece 12 side. An exhaust port 61 communicating with the outside is formed.

Reference numeral 7 denotes a shield wall, which is formed of a magnetic material made of iron or an iron alloy into a plate shape, and is provided substantially orthogonal to the fixed wall 6 on the side opposite to the fixed contact plate 3 side of the movable contact plate 4.
The air passage 71 communicates with the U-shaped inner side 1a so that the second facing piece 13
And the gas generated in the U-shaped inner side 1a at the time of arcing is introduced into the ventilation path 71 to shield the gas.

Reference numeral 8 denotes a partition wall, which is made of an insulating material and has a plate shape, and has a first gap 81 and a second gap 82 of predetermined dimensions between the fixed wall 6 and the shield wall 7, respectively. 7 is provided in the ventilation path 71. Also, the partition 8
An insulating plate 83 connected to the center piece 11, the first facing piece 12, and the second facing piece 13 is covered.

The operation of this one will be described. The exhaust port 61 exhausts the gas generated inside the U-shaped inside 1a when an arc occurs. In addition, the mechanism portion having the second link 10e and the third link 10f, the bimetal 10b, and the U-shaped yoke 10d.
And an abnormal current detector having the above are provided on the opposite side of the movable contact plate 4 from the fixed contact plate 3 side. Therefore,
The shield wall 7 protects the mechanism section and the abnormal current detection section from the high temperature gas at the time of arc generation.

Immediately after the arc is generated, an arc is generated between the contacts and sticks to the contact surfaces of the fixed contact 31 and the movable contact 43. The arc heats the space inside the U-shaped inside 1a to increase the pressure. Along with this, the high-temperature gas is exhausted from the exhaust port 61, and also passes through the first gap 81 having a predetermined size formed between the partition wall 8 and the fixed wall 6 and similarly the partition wall 8 is formed.
And a second gap 82 having a predetermined size formed between the shield wall 7 and
Pass through. That is, the first void 81 and the second void 82.
Form the ventilation path 71.

Due to the flow of the gas, the stuck arc receives a force in the extending direction of the arc traveling plates 33 and 44, and thus the arc easily moves faster. When the legs of the arc move to the arc traveling plates 33, 44 and the opening distance between the contacts 31, 43 increases, the magnetic driving force generated by the coil 1 and the gas flow toward the exhaust port 61 cause the arc to move. Grows. Furthermore, since gas flows along the ventilation path 71 from the tip of the arc traveling plate 44 provided on the movable contact plate 4, as shown in FIG. 25 and FIG.
Through the first gap 81 between the fixed wall 6 and the fixed wall 6, and extends to the second gap 82 between the shield wall 7 and the partition wall 8 to be entangled with the shield wall 7.

Here, the shield wall 7 is made of a magnetic material. Therefore, when the short-circuit current passes, the movable contact plate 4
The magnetic flux generated around the magnetic flux forms a magnetic path between the movable contact plate 4 and the magnetic body, and a magnetic attraction force acts to attract the movable contact plate 4 to the magnetic body, that is, the shield wall 7.

In the arc-extinguishing system of the eighth embodiment, as described above, the ventilation passage 71 communicating with the U-shaped inner side 1a is provided between the shielding wall 7 and the second facing piece 13. A high-temperature gas generated in the U-shaped inner side 1a when an arc is generated is shielded by the shield wall 7, and is also formed by the fixed wall 6 and the shield wall 7 substantially orthogonal to the fixed wall 6. Venting along 71, the arc extends in the direction along the gas flow, the arc length increases, and the arc voltage can be steeply raised.

Further, the partition wall 8 is the second facing piece 1 of the air passage 71.
Since it is provided on the third side, the first gap 81 and the second gap 82 each having a predetermined size between the fixed wall 6 and the shield wall 7 become the ventilation passage 71 for the gas generated by the arc, and the ventilation passage is formed. 71 can be accurately formed to a predetermined size.

Since the shielding wall 7 is made of a magnetic material, the magnetic flux generated around the movable contact plate 4 when a short circuit current passes forms a magnetic path between the movable contact plate 4 and the magnetic material. As a result, the movable contact plate 4 is attracted to the magnetic material, and the contact opening speed can be further increased.

Further, since the partition wall 8 is an insulator, it is possible to prevent the arc extending in the direction along the gas flow from being entangled with the partition wall 8 and prolong the life of the partition wall 8.

In the eighth embodiment, the shield wall 7 which is substantially orthogonal to the fixed wall 6 is provided as a new member. However, when it is desired to reduce the cost and reduce the size, the fixed contact may be provided as shown in FIG. The shield wall 7 may be formed by the operation handle 7a for connecting the movable contact 43 to and from the movable contact 31, and may also be used.
Not limited.

Further, in the eighth embodiment, the partition wall 8 having the first gap 81 and the second gap 82 having a predetermined size between the fixed wall 6 and the shield wall 7 is provided in the ventilation passage 71.
If the area of the ventilation passage 71 is small and there is no room in the installation space, the partition wall 8 may not be provided, and there is no limitation.

Further, in the eighth embodiment, the shield wall 7 is made of a magnetic material, but the partition wall 8 or the partition wall 8 and the shield wall 7 may be made of a magnetic material. At this time, only the shield wall 7 is formed. Since the magnetic body is closer to the movable contact plate 4 than the case where is formed of a magnetic body, a stronger magnetic attraction force acts on the movable contact plate 4.

Further, in the eighth embodiment, the partition wall 8 is formed of an insulator, but the partition wall 8 may be formed of a metal and covered with an insulator, and the shield wall 7 or the shield wall 7 and the partition wall 8 may be formed. May be formed by being covered with an insulator or an insulator, and is not limited.

Further, in the eighth embodiment, the first facing piece 12
Although the exhaust port 61 is formed on the side, as shown in FIG. 28, another exhaust port 62 communicating with the outside and the ventilation passage 71 may be provided in the fixed wall 6, and the ventilation passage 71 communicating with the U-shaped inner side 1a. Need only be provided between the shielding wall 7 and the second facing piece 13, and is not limited.

FIG. 29 to FIG. 30 show the ninth embodiment of the present invention.
It will be described below based on. In the ninth embodiment, the functions different from the seventh embodiment will be described.
For members having substantially the same function as the embodiment,
The same reference numerals are given.

Reference numeral 9 denotes a magnetic piece, which is made of a magnetic material made of iron or an iron alloy and is formed into a substantially L-shape including a piece 91 and another piece 92. The piece 91 is connected to the fixed contact 31 of the fixed contact plate 3. To the opposite side, the other piece 92 is the central piece 11 of the fixed contact plate 3.
Fixed in contact with the side surfaces of
Both 1 and the other piece 92 are located on the terminal plate 2 side of the central piece 11.

The operation of this product will be described. When the short-circuit current passes, magnetic flux is generated around the fixed contact plate 3. As shown in FIG. 30, since the magnetic piece 9 is provided at the position of the fixed contact 31, the magnetic flux passes through the magnetic piece 9 having a small magnetic resistance to form a magnetic path, that is, the magnetic flux of the fixed contact 31. Higher density on the surface side. The arc is driven in the extending direction of the arc traveling plates 33 and 44 by the magnetic flux having the high density.

In the arc-extinguishing device of the ninth embodiment, as described above, since the magnetic piece 9 having a small magnetic resistance is provided on the fixed contact plate 3 at the fixed contact 31 position, the short circuit current passes. At this time, the magnetic flux generated around the fixed contact plate 3 has a higher density on the surface side of the fixed contact 31 than when the magnetic piece 9 is not provided, and gives a strong driving force to the arc generated between the contacts. Therefore, the arc can be run at a high speed.

Further, since the magnetic piece 9 is formed in a substantially L-shape, when the L-shaped piece 91 abuts on the opposite side of the fixed contact plate 3 with respect to the fixed contact 31, the heat generated in the energized state of the rated current is generated. Is dissipated, the fixed contact 31 can be cooled and the life can be extended, and the magnetic flux can be further densified by the one piece 91 and the other piece 92. Further, since the magnetic piece 9 is formed so as to be located on the terminal plate 2 side of the central piece 11, both the L-shaped one piece 91 and the other piece 92 should project to the opposite side of the central piece 11 from the terminal plate 2 side. Without, it is possible to achieve thinning.

In the ninth embodiment, the magnetic piece 9 is formed in a substantially L shape in which one piece 91 is in contact with the fixed contact plate 3 on the opposite side to the fixed contact 31. However, the magnetic piece 9 is formed in a flat plate shape instead of the L shape. It may be formed and provided at the position of the fixed contact 31, and is not limited.

[0104]

According to the first aspect of the present invention, the fixed contact plate is
Since it extends in the direction of the U-shaped inside of the coil from the vertical line drawn from the tip of the second facing piece to the first facing piece longer than the second facing piece, that is, the region where the magnetic field is strong,
A strong magnetic field acts on the arc generated from the fixed contact and the movable contact that is separated, and the arc receives a strong driving force and extends, whereby the arc voltage can be sharply increased. Further, the movable contact plate receives an electromagnetic repulsive force between the movable contact plate and the first opposing piece and an electromagnetic attraction force between the movable contact plate and the second opposing piece, so that the movable contact is fixed at high speed. The arc voltage can be rapidly raised by opening the contact.

According to a second aspect of the present invention, in addition to the effect of the first aspect, the fixed contact plate is extended from the tip of the second facing piece substantially in parallel with the first facing piece through the intermediate piece. So
The movable contact plate is not parallel to the first facing piece due to the magnetic field generated inside the U-shaped coil,
It receives a strong electromagnetic repulsive force, and at high speed, it separates from the fixed contact,
The arc voltage can be raised more rapidly.

According to a third aspect of the present invention, in addition to the effect of the first aspect, the fixed contact plate extends from the tip of the second facing piece substantially parallel to the second central piece which is a part of the central piece. Since it is installed, the movable contact plate receives a strong electromagnetic attraction force due to the magnetic field generated inside the U-shape of the coil compared to the state where it is not parallel to the second center piece, and opens from the fixed contact at high speed. By separating them, the arc voltage can be raised more rapidly.

According to a fourth aspect of the present invention, in addition to the effect of the first aspect, the movable contact plate is formed so as to rotate from the U-shaped inside of the coil to the outside thereof. The magnetic field generated inside the U-shape becomes strong, and this strong magnetic field can be applied to the arc generated immediately after the contact is opened, and a strong magnetic driving force can be applied.

According to a fifth aspect of the invention, in addition to the effects of the first aspect, the plate thickness of the second facing piece of the coil located on the rotating surface of the movable contact plate, or the center piece and the second facing piece. Since the direction is perpendicular to the rotating surface, the plate thickness of the central piece and the second opposing piece is extended in the direction orthogonal to the rotating surface, not the plate width, so that the thickness can be reduced.

According to a sixth aspect of the present invention, in addition to the effect of the first aspect, the plate thickness direction of at least one of the central piece and the first facing piece is perpendicular to the rotating surface of the movable contact plate. Therefore, the high temperature gas generated by the arc is
It can be discharged without being blocked by the plate width, and a hot gas exhaust port can be formed on the traveling side of the arc without providing a hole in the central piece or the first opposing piece.

According to a seventh aspect of the invention, in addition to the effect of the first aspect, the plate thickness direction of each of the central piece, the first opposing piece and the second opposing piece is the rotating surface of the movable contact plate. Since it is formed vertically to the opposite, two exhaust ports are provided to the central one side and the first opposing one side without forming a hole, that is, in the traveling direction of the arc, as compared with the case where the exhaust port is only on one side, The arc can be easily extended, the arc voltage can be raised more rapidly, and thinning can be achieved.

According to the eighth aspect, in addition to the effect of the first aspect, each of the central piece, the first facing piece, the second facing piece and the terminal plate is in a direction perpendicular to the contact surface of the fixed contact. Since the conductor is bent, the conductor is bent to form the terminal plate, the first opposing piece of the coil, the second opposing piece, the central piece, and the fixed contact plate, and the welding electrode or the caulking rod. Is installed in the space, and the fixed contact can be easily joined to the fixed contact plate without the fixed contact being peeled off or the surface being scratched during the bending process.

According to the ninth aspect, in addition to the effect of the first aspect, at least one of the central piece, the first opposing piece or the second opposing piece is covered with an insulating material such as resin. Therefore, it is possible to prevent the arc generated when the movable contact is separated from the fixed contact from being entangled with the central piece of the coil, the first facing piece, or the second facing piece.

According to a tenth aspect of the present invention, in addition to the effect of the first aspect, the arc traveling plates are provided so as to extend from the respective tip portions of the fixed contact plate and the movable contact plate. Compared with the case where no plate is provided, the arc generated between the contacts travels at a higher speed along each arc traveling plate, and the arc voltage can be sharply raised.

According to the eleventh aspect of the present invention, in addition to the effect of the tenth aspect, the notch portions are provided on the respective arc running plates along the extending direction from the arc sticking position, so that the arc is driven. Driven in the direction, the foot is fixed at the glued position of the contact tip and glued, the base end of the notch is located in the center of the arc with high temperature and the temperature rises and electrons are emitted. The arc is emitted and the electric field is concentrated on the corner, and the foot of the arc is moved to the base end part and then along the corner in the extending direction, so that the arc can travel at a higher speed.

According to the twelfth aspect, in addition to the effect of the first aspect, the ventilation passage communicating with the U-shaped inner side is provided between the shielding wall and the second facing piece. The high-temperature gas generated inside the U-shape is shielded by the shield wall, and is ventilated along the ventilation path formed by the fixed wall and the shield wall substantially orthogonal to the fixed wall,
The arc extends in the direction along the gas flow and the arc length becomes long, so that the arc voltage can be sharply raised.

According to the thirteenth aspect, in addition to the effect of the twelfth aspect, since the shield wall is formed by the operation handle, the shield wall and the operation handle are combined into one member, and the cost is reduced. The cost can be reduced and the size can be reduced.

According to the fourteenth aspect, in addition to the effect of the twelfth aspect, since the partition wall is provided on the second opposing side of the ventilation path, a predetermined dimension is provided between the fixed wall and the shielding wall. The voids thus formed serve as ventilation passages for the gas generated by the arc, and the ventilation passages can be accurately formed to have a predetermined size.

According to the fifteenth aspect, in addition to the effect of the twelfth aspect or the fifteenth aspect, at least one of the shielding wall and the partition wall is made of a magnetic material. The magnetic flux generated around the movable contact plate forms a magnetic path between the movable contact plate and the magnetic body, and the movable contact plate is attracted to the magnetic body, so that the opening speed can be further increased.

According to the sixteenth aspect, in addition to the effect of the twelfth or fourteenth aspect, at least one of the shield wall and the partition wall is covered with an insulator or an insulator, and therefore, the gas ventilation flow is provided. It is possible to prevent the arc extending in the direction along the line from being entangled, and to extend the life of at least one of the shielding wall and the partition wall.

According to the seventeenth aspect, in addition to the effect of the first aspect, since the magnetic piece having a small magnetic resistance is provided on the fixed contact plate at the fixed contact position, the fixed contact when the short-circuit current passes. The magnetic flux generated around the plate has a higher density on the surface side of the fixed contact than when no magnetic piece is provided, giving a strong driving force to the arc generated between the contacts and making the arc at a high speed. Can be driven.

According to the eighteenth aspect, in addition to the effect of the seventeenth aspect, since the magnetic piece is formed in a substantially L shape, one piece of the L shape is provided on the opposite side of the fixed contact plate to the fixed contact. When they come into contact, they dissipate the heat generated when the rated current is applied, cooling the fixed contacts and extending their service life.
The magnetic flux can be further densified with one piece and the other piece.

According to the nineteenth aspect, in addition to the effect of the seventeenth aspect, since the magnetic piece is formed so as to be positioned inside the U-shape, one piece of the L-shaped magnetic piece and the other piece are formed. Both can be made thin without protruding outside the U-shape.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a front view immediately after opening the contacts of the same.

FIG. 3 is a front view of the contact when the contacts are opened.

FIG. 4 is a front view of the same as above after the separation.

FIG. 5 is a perspective view of the same.

FIG. 6 is an assembly diagram of the above circuit breaker.

FIG. 7 is a perspective view showing a state in which the above-mentioned second facing piece is a plurality of members.

FIG. 8 is a front view showing a second embodiment of the present invention.

FIG. 9 is a perspective view of the same.

FIG. 10 is a front view of the above fixed contact plate in a substantially parallel state.

FIG. 11 is a front view showing a third embodiment of the present invention.

FIG. 12 is a perspective view of the same.

FIG. 13 is a front view showing a fourth embodiment of the present invention.

FIG. 14 is a front view showing a fifth embodiment of the present invention.

FIG. 15 is a perspective view showing a sixth embodiment of the present invention.

FIG. 16 is a perspective view showing a state of being covered with the same insulating material.

FIG. 17 is a perspective view showing a seventh embodiment of the present invention.

FIG. 18 is a plan view showing an arc sticking position in the fixed contact of the above.

FIG. 19 is a side view showing an extended state of the sticking arc of the above.

FIG. 20 is a perspective view of another embodiment of the above.

FIG. 21 is a perspective view of another embodiment of the above.

FIG. 22 is a plan view showing another arc sticking position in the fixed contact of the above.

FIG. 23 is a front view showing an eighth embodiment of the present invention.

FIG. 24 is a perspective view of the above.

FIG. 25 is a front view showing the extended state of the above arc.

FIG. 26 is a front view showing a state where the above-mentioned arc extends and is entangled.

FIG. 27 is a front view of another embodiment of the same.

FIG. 28 is a front view of another embodiment of the same.

FIG. 29 is a perspective view showing a ninth embodiment of the invention.

FIG. 30 is a side view showing a magnetic flux density of magnetic flux generated around the fixed terminal plate of the above.

FIG. 31 is a perspective view showing a conventional example.

FIG. 32 is an assembly diagram of the above circuit breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 coil 1a U-shaped inner side 11 central piece 12 first facing piece 13 second facing piece 13a tip 2 terminal plate 3 fixed contact plate 3a base end 31 fixed contact 31a space 31b arc sticking position 32 intermediate piece 33 arc running plate 33a Notch 4 Movable contact plate 42 Rotating shaft 43 Movable contact 43a Arc sticking position 44 Arc running plate 44a Notch 5 Insulator 6 Fixed wall 7 Shielding wall 71 Ventilation path 7a Operation handle 8 Partition 81 First gap 82 Second Void 9 Magnetic piece 91 Single piece

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuya Kagawa 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (19)

[Claims] 1. A plate-shaped conductor, a central piece and a first facing piece and a second facing piece that project from both ends of the central piece and face each other. A coil,
A terminal plate extending from the tip of the first facing piece and connected to an external electric path; and a fixed contact plate extending from the tip of the second facing piece toward the first facing piece and having a fixed contact at the tip. , A movable contact plate having a movable contact at its tip which rotates around a rotating shaft located on the base end side of the fixed contact plate and contacts and separates from the fixed contact inside the U-shape of the coil. An arc extinguishing device for extinguishing an arc generated between contacts by driving with a magnetic field of a coil, wherein the first facing piece is longer than the second facing piece, and the fixed contact plate is the second facing piece. An arc-extinguishing device, wherein the arc-extinguishing device is provided so as to extend toward a U-shaped inner side of the coil from a perpendicular line drawn from the tip of the piece to the first facing piece. 2. The arc extinguishing device according to claim 1, wherein the fixed contact plate is extended substantially in parallel with the first facing piece through an intermediate piece. 3. The arc extinguishing device according to claim 1, wherein the fixed contact plate extends substantially parallel to a part or all of the central piece. 4. The arc extinguishing device according to claim 1, wherein the movable contact plate is formed so as to rotate from the U-shaped inside of the coil to the outside. 5. A plate thickness direction of the second facing piece or the second facing piece and the central piece is formed perpendicular to a rotating surface of the movable contact plate. Item 1
Arc extinguishing device described. 6. The arc extinguishing system according to claim 1, wherein the plate thickness direction of at least one of the central piece and the first facing piece is formed perpendicular to the rotating surface. apparatus. 7. The plate thickness direction of the central piece, the first facing piece, and the second facing piece is formed perpendicular to the rotating surface of the movable contact plate. Arc extinguishing device according to 1. 8. The center piece, the first facing piece, and the second piece
The arc-extinguishing device according to claim 1, wherein each of the facing piece and the terminal plate is provided with a space in a direction orthogonal to a contact surface of the fixed contact. 9. The arc extinguishing device according to claim 1, wherein at least one of the central piece, the first facing piece, or the second facing piece is covered with an insulating material. 10. The fixed contact plate and the movable contact plate are each provided with an arc traveling plate on which the arc travels extending from the respective tip portions. Arc extinguishing device. 11. The arc running plate according to claim 10, wherein each arc running plate is provided with each notch portion extending in an extending direction from an arc sticking position where the arc sticks to a contact end. Arc extinguishing device. 12. A fixed wall and a shield wall that is substantially orthogonal to the fixed wall and shields gas when the arc is generated, to a side opposite to the fixed contact plate side of the central piece and to the fixed of the movable contact plate. Provided on the opposite side to the contact plate side,
The arc-extinguishing device according to claim 1, wherein an air passage communicating with the U-shaped inner side is provided between the shielding wall and the second facing piece. 13. The arc extinguishing device according to claim 12, wherein the shield wall is formed by an operation handle that connects and disconnects the movable contact to and from the fixed contact. 14. A partition wall having a gap of a predetermined size between each of the fixed wall and the shielding wall is provided on the second opposing side of the ventilation path.
Arc extinguishing device described. 15. The arc extinguishing device according to claim 12, wherein at least one of the shielding wall and the partition wall is made of a magnetic material. 16. The arc-extinguishing device according to claim 12, wherein at least one of the shielding wall and the partition wall is covered with an insulator or an insulator. 17. The arc extinguishing device according to claim 1, wherein the fixed contact plate is provided with a magnetic piece having a small magnetic resistance at a position of the fixed contact. 18. The arc-extinguishing device according to claim 17, wherein one of the magnetic pieces is formed in a substantially L-shape that abuts on the opposite side of the fixed contact plate to the fixed contact. 19. The arc extinguishing device according to claim 17, wherein the magnetic piece is formed so as to be located on the side of the terminal plate of the central piece.