JP2021015725A - Circuit breaker - Google Patents

Abstract

To provide a circuit breaker capable of extinguishing an arc more quickly while causing an arc extinguishing device to show its performance more greatly.SOLUTION: A circuit breaker 10 includes a stationary contactor 5 provided with a stationary contact 51, a movable contactor 6 provided with a movable contact 61 that moves to contact or separate from the stationary contact 51, a mechanism unit 9 for driving the movable contactor 6 so that the movable contact 61 transits between a conductive state where the movable contact 61 contacts the stationary contact 51 and a non-conducting state where the movable contact 61 does not contact the stationary contact 51, an arc extinguishing device 7 for promoting extinction of an arc discharge generated when transiting from the conductive state to the non-conducting state. An arc transmission unit 8 is provided between the arc extinguishing device 7 and a conduction place where the stationary contact 51 and the movable contact 61 so as to have the same potential as the movable contact 61.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to circuit breakers.

In a circuit breaker, an arc is generated when the fixed contact and the movable contact are separated from each other. When an arc is generated, it is preferable to extinguish the arc as soon as possible. From this point of view, the circuit breaker described in Patent Document 1 below has been proposed.

The circuit breaker described in Patent Document 1 below has an arc extinguishing device arranged in the vicinity of an orbit in which a movable contact provided on a movable contact is separated from a fixed contact provided on the fixed contact. In the arc extinguishing device, a plurality of grids are laminated and arranged side by side at regular intervals, and the grids are connected to each other by a conductive member capable of being fused by an arc current, and one end is brought into contact with a fixed contactor.

JP-A-2000-243207

Even in the circuit breaker described in Patent Document 1, it is possible to extinguish the generated arc. However, it is required to extinguish the arc more quickly while exerting the performance of the arc extinguishing device more quickly.

An object of the present disclosure is to provide a circuit breaker capable of extinguishing an arc more quickly while further exerting the performance of the arc extinguishing device.

The present disclosure is a circuit breaker, in which a fixed contact provided with a fixed contact, a movable contact provided with a movable contact that moves to contact or separate from the fixed contact, and a movable contact that is a fixed contact. The mechanism that drives the movable contact so as to transition between the conductive state that contacts and the non-conducting state that does not contact, and the extinguishing that promotes the extinction of the arc discharge that occurs when transitioning from the conductive state to the non-conducting state. An arc device is provided, and an arc transmission unit is provided between a conduction portion where the fixed contact and the movable contact come into contact with the arc extinguishing device and the arc extinguishing device so as to have the same potential as the movable contact.

In the present disclosure, since the arc transmission unit is provided so as to have the same potential as the movable contact, the arc discharge shifts toward the arc transmission unit when an arc discharge occurs. Since the arc transmission unit is provided between the conduction point and the arc extinguishing device, the arc discharge generated when the movable contact is separated from the fixed contact at the conduction point can be transferred toward the arc extinguishing device. , The function of the arc extinguishing device can be exhibited more reliably.

According to the present disclosure, it is possible to provide a circuit breaker capable of extinguishing an arc more quickly while further exerting the performance of the arc extinguishing device.

FIG. 1 is a cross-sectional view for explaining the circuit breaker in the present embodiment. FIG. 2 is a diagram for explaining an arc transmission unit in the present embodiment. FIG. 3 is a cross-sectional view for explaining a circuit breaker in a modified example of the present embodiment. FIG. 4 is a perspective sectional view for explaining a circuit breaker in a modified example of the present embodiment.

Hereinafter, the present embodiment will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.

FIG. 1 is a cross-sectional view for explaining the circuit breaker 10 in the present embodiment. The circuit breaker 10 is, for example, a device provided on an electric circuit connecting a power source and a load, and switches between continuity and interruption of the electric circuit. As shown in FIG. 1, the circuit breaker 10 is in movable contact with the first housing portion 21, the second housing portion 22, the power supply side terminal seat 3, the load side terminal seat 4, and the fixed contactor 5. It includes a child 6, a handle 24, an arc extinguishing device 7, an arc transmission unit 8, and a mechanism unit 9.

The housing of the circuit breaker 10 is configured by combining a third housing portion as a cover (not shown) in addition to the first housing portion 21 and the second housing portion 22. FIG. 1 shows the first housing portion 21 and the second housing portion 22 as a base by removing the third housing portion as a cover.

The first housing portion 21 and the second housing portion 22 include a power supply side terminal seat 3, a load side terminal seat 4, a fixed contact 5, a movable contact 6, a handle 24, an arc extinguishing device 7, and an arc extinguishing device 7. The arc transmission unit 8 and the housing are housed.

The first housing portion 21 and the second housing portion 22 have a first wall portion 201, a second wall portion 202, and a third wall portion 203. The first wall portion 201 and the second wall portion 202 are arranged so as to face each other. The third wall portion 203 is provided so as to connect the first wall portion 201 and the second wall portion 202.

When the circuit breaker 10 is attached to a mounting portion such as a base plate of a distribution board, the first wall portion 201 is arranged on the power supply side of the electric circuit, and the second wall portion 202 is arranged on the load side of the electric circuit. The third wall portion 203 is arranged on the base plate side.

The power supply side terminal seat 3 is attached to the power supply side mounting portion 221 of the second housing portion 22. The power supply side terminal seat 3 is arranged on the first wall portion 201 so as to be exposed to the outside of the first housing portion 21 and the second housing portion 22.

A crimp terminal 33 is attached to the power supply side terminal seat 3 by a screw 32. The crimp terminal 33 is connected to the external wiring on the power supply side.

The fixed contact 5 is integrally provided with a conductive plate-shaped metal member so as to form the same plane as the power supply side terminal seat 3. The fixed contact 51 is provided at an end of the fixed contact 5 opposite to the power supply side terminal seat 3. The fixed contact 51 is provided on the moving track of the movable contact 61 provided at one end of the movable contact 6.

The load-side terminal seat 4 is attached to the load-side mounting portion 222 of the second housing portion 22. The load-side terminal seat 4 is arranged on the second wall portion 202 so as to be exposed to the outside of the first housing portion 21 and the second housing portion 22.

A crimp terminal 43 is attached to the load side terminal seat 4 by a screw 42. The crimp terminal 43 is connected to the external wiring on the load side.

The movable contact 6 is a movable component provided inside the first housing portion 21 and the second housing portion 22 in order to conduct and cut off the electric circuit. The handle 24 is a movable part provided for operating the movable contactor 6.

The movable contact 6 is electrically connected to the load side terminal seat 4 through internal wiring. The movable contact 6 has a movable contact 61 formed at one end thereof. The movable contact 6 swings around the other end based on the manual operation of the handle 24 or the operation of the mechanism unit 9. As the movable contact 6 swings, the movable contact 61 comes into contact with and separates from the fixed contact 51.

When the movable contact 61 is in contact with the fixed contact 51, the movable contact 6 is held substantially parallel to the fixed contact 5. When the movable contact 61 is separated from the fixed contact 51, the movable contact 6 is held at the cutoff position shown in FIG.

An exhaust passage 223 is provided inside the first housing portion 21 and the second housing portion 22. The exhaust passage 223 is a passage for exhausting the arc gas generated when the movable contact 61 separates from the fixed contact 51 to the outside. The first wall portion 201 is provided with an exhaust port 201a through which the exhaust passage 223 communicates with the outside.

The arc extinguishing device 7 is provided in the arc gas exhaust passage 223 in the first housing portion 21 and the second housing portion 22. The arc extinguishing device 7 has a plurality of grids and extinguishes the arc gas.

The circuit breaker 10 in the present embodiment includes a fixed contact 5 provided with a fixed contact 51, a movable contact 6 provided with a movable contact 61 that moves to contact or separate from the fixed contact 51, and a movable contact. It occurs when the mechanical unit 9 that drives the movable contact 6 transitions from the conductive state to the non-conducting state so that the 61 transitions between the conductive state in which it contacts the fixed contact 51 and the non-conducting state in which it does not contact. An arc extinguishing device 7 that promotes the extinction of the arc discharge is provided, and an arc is provided between the conduction point where the fixed contact 51 and the movable contact 61 come into contact and the arc extinguishing device 7 so as to have the same potential as the movable contact 61. A transmission unit 8 is provided.

In the present disclosure, since the arc transmission unit 8 is provided so as to have the same potential as the movable contact 61, the arc discharge shifts toward the arc transmission unit 8 when an arc discharge occurs. Since the arc transmission unit 8 is provided between the conduction portion and the arc extinguishing device 7, the arc discharge generated when the movable contact 61 is separated from the fixed contact 51 at the conduction portion is directed to the arc extinguishing device 7. The transition can be made, and the function of the arc extinguishing device 7 can be more reliably exhibited.

As shown in FIG. 1, the arc transmission unit 8 has an arc receiving portion 81 close to the conduction portion and an arc diffusion portion 82 connected to the arc receiving portion 81 and directed toward the arc extinguishing device 7.

Since the arc receiving portion 81 is provided so as to be close to the conductive portion, it is possible to attract the arc discharge generated by the movable contact 61 being separated from the fixed contact 51 at the conductive portion. Since the arc diffusion portion 82 is connected to the arc receiving portion 81 and heads toward the end of the arc extinguishing device 7, the arc discharge attracted by the arc receiving portion 81 can be directed toward the arc extinguishing device 7 while diffusing.

In the present embodiment, the mechanism unit 9 has a conduction between a power supply side terminal seat 3 as a pair of first external terminals and a load side terminal seat 4 as a second external terminal between a conductive state and a non-conducting state. The movable contact 6 is driven so as to make a transition. The arc extinguishing device 7 is provided on the power supply side terminal seat 3 side as the first external terminal, and the arc transmission unit 8 is a connection portion (first connection) electrically connected to the load side terminal seat 4 as the second external terminal. It has a portion 83 and a second connecting portion 84).

Since the connection portion is electrically connected to the load side terminal seat 4 as the second external terminal, the connection portion has the same potential as the load side terminal seat 4, and the arc receiving portion 81 and the arc diffusion portion 82 also have the load side terminal seat. Since the potential can be set to the same as that of No. 4, the transfer of the arc discharge to the arc extinguishing device 7 can be performed more reliably.

The circuit breaker 10 in the present embodiment further includes a housing including a fixed contact 5, a movable contact 6, a mechanism portion 9, an arc extinguishing device 7, and an arc transmission portion 8. The housing is configured by combining at least the first housing portion 21 and the second housing portion 22. The first housing portion 21 and the second housing portion 22 are formed in the shape of a bottomed container provided with an opening, and have a fixed contact 5, a movable contact 6, a mechanism 9, an arc extinguishing device 7, and an arc. The transmission portion 8 is configured so that it can be assembled to the first housing portion 21 and the second housing portion 22 from the opening.

The fixed contact 5, the movable contact 6, the mechanism 9, the arc extinguishing device 7, and the arc transmission 8 are assembled from the openings provided in the bottomed container-shaped first housing portion 21 and the second housing portion 22. Therefore, the circuit breaker 10 having the arc transmission unit 8 can be easily assembled.

The arc transmission portion 8 is housed between the power supply side fixed wall 211 and the load side fixed wall 212 provided in the first housing portion 21. The power supply side fixing wall 211 is provided on the power supply side terminal seat 3 side. The load-side fixed wall 212 is provided on the load-side terminal seat 4 side.

In the present embodiment, the mechanism unit 9 has a conduction between a power supply side terminal seat 3 as a pair of first external terminals and a load side terminal seat 4 as a second external terminal between a conductive state and a non-conducting state. The movable contact 6 is driven so as to make a transition, and the arc extinguishing device 7 is provided on the power supply side terminal seat 3 side as the first external terminal. The arc transmission portion 8 has a connection portion that is electrically connected to the load side terminal seat 4 as the second external terminal, and the connection portion includes a first connection portion 83 along the bottom portion of the first housing portion 21 and a bottom portion. It has a second connection portion 84 extending from the load side terminal seat 4 as a second external terminal.

As shown in FIG. 2, the second connection portion 84 is connected to the first connection portion 83 so that an urging force acts on the load side terminal seat 4 as the second external terminal. Specifically, as shown in FIG. 2 (A), in the no-load state, the second connection portion 84 is inclined outward from the reference position (the position shown in FIG. 2 (B)). There is. When the arc transmission portion 8 is housed in the first housing portion 21, the state transitions from FIG. 2 (A) to FIG. 2 (B), and the second connection portion 84 becomes the load side terminal seat 4 as the second external terminal. It is formed so that the urging force works against it.

When the arc transmission portion 8 is assembled to the first housing portion 21 and the second housing portion 22, the second connection portion 84 is urged to the load side terminal seat 4 which is the second external terminal. Therefore, the load-side terminal seat 4 which is the second external terminal and the second connection portion 84 can be surely brought into contact with each other, and the arc transmission portion 8 can be surely at the same potential as the second external terminal.

In the present embodiment, the arc transmission portion is configured to be held by sandwiching a second connection portion between the load side terminal seat 4 which is the second external terminal and the second housing portion 22 constituting the housing. May be done. The arc transmission unit 8A configured in this way will be described with reference to FIGS. 3 and 4.

FIG. 3 is a cross-sectional view of a circuit breaker 10A provided with an arc transmission unit 8A. FIG. 4 is a perspective sectional view of the circuit breaker 10A provided with the arc transmission unit 8A. The arc transmission unit 8A has an arc receiving portion 81, an arc diffusion portion 82, a first connection portion 83, and a second connection portion 84A. The arc receiving portion 81, the arc diffusion portion 82, and the first connecting portion 83 are the same as those of the arc transmitting portion 8.

The second connection portion 84A rises from the first connection portion 83 toward the load side mounting portion 222 and is bent along the load side mounting portion 222. The bent end of the second connection portion 84A is sandwiched and held between the load side mounting portion 222 and the load side terminal seat 4.

Since the second connection portion 84A is held by being sandwiched between the load side terminal seat 4 which is the second external terminal and the load side mounting portion 222 of the second housing portion 22, the load side which is the second external terminal The terminal seat 4 and the second connection portion 84A can be surely brought into contact with each other, and the arc transmission portion 8A can be surely set to the same potential as the load side terminal seat 4 which is the second external terminal.

In the present embodiment, the arc transmission portions 8 and 8A are held by the fixing member 25 made of an insulating material with respect to the first housing portion 21 and the second housing portion 22 which are housings.

Since the arc transmission portions 8 and 8A are held by the fixing member 25 made of an insulating material with respect to the first housing portion 21 and the second housing portion 22 which are housings, the potential of the arc transmission portions 8 and 8A is affected. Can be held without giving.

In the present embodiment, the arc transmission portions 8 and 8A are an arc receiving portion 81 close to the conduction portion, an arc diffusion portion 82 toward the end of the arc extinguishing device 7, and a second external terminal from the arc receiving portion 81. The fixing member 25 has a first connection portion 83 and a second connection portion 84, 84A which are connection portions electrically connected to the load side terminal seat 4, and the fixing member 25 has a first connection portion 83 as a connection portion in a housing. The arc transmission portions 8 and 8A are held by being sandwiched between the first housing portion 21 and the second housing portion 22.

By sandwiching the first connection portion 83 as the connection portion between the fixing members 25, it is not necessary to fix the arc receiving portion 81 and the arc diffusion portion 82 with the fixing member 25, and the arc discharge in the arc receiving portion 81 and the arc diffusion portion 82. The transfer of the arc discharge to the arc extinguishing device 7 can be performed more reliably without impairing the transmission function.

In the present embodiment, the fixing member 25 is held by being sandwiched between the power supply side terminal seat 3 which is the first external terminal and the first housing portion 21 and the second housing portion 22 which are housings.

Since the fixing member 25 is held by sandwiching it between the power supply side terminal seat 3 which is the first external terminal and the first housing portion 21 and the second housing portion 22 which are housings, the assembly of parts to the housing portion is used. , Can be held without adding new members.

In the present embodiment, the fixing member 25 is provided so as to sandwich the arc receiving portion 81 between the power supply side terminal seat 3 which is the first external terminal and the first housing portion 21 and the second housing portion 22 which are housings. The arc transmission promoting unit 251 is provided, and the arc transmission promoting unit 251 includes a metal member formed of a magnetic material.

By providing the arc transmission promoting portion 251 including the metal member formed of the magnetic material so as to sandwich the arc receiving portion 81, the generated arc discharge can be drawn to the arc receiving portion 81 side.

In the present embodiment, the fixing member 25 is formed of a material that generates an arc extinguishing gas for cooling the arc gas generated by the arc discharge.

Since the arc extinguishing gas can be generated from the fixing member 25 in response to the arc discharge drawn to the arc receiving portion 81 side, the arc extinguishing function can be more reliably exhibited.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those skilled in the art with appropriate design changes to these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, its arrangement, conditions, shape, etc. is not limited to the illustrated one, and can be appropriately changed. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction. In the above description, the first external terminal is referred to as the power supply side terminal seat 3 and the second external terminal is referred to as the load side terminal seat 4, but the first external terminal is referred to as the load side terminal seat 4 and the second external terminal is referred to as the power supply side. It may be the terminal seat 3.

10, 10A: Circuit breaker 201a: Exhaust port 21: First housing part 22: Second housing part 221: Power supply side mounting part 222: Load side mounting part 223: Exhaust passage 25: Fixing member 251: Arc transmission promoting part 3 : Power supply side terminal seat 4: Load side terminal seat 5: Fixed contact 51: Fixed contact 6: Movable contact 61: Movable contact 7: Arc extinguishing device 8, 8A: Arc transmission unit 81: Arc receiving part 82: Arc diffusion Part 83: First connection part 84, 84A: Second connection part 9: Mechanical part

Claims (11)

It ’s a circuit breaker,
Fixed contacts with fixed contacts and
A movable contact provided with a movable contact that moves so as to contact or separate from the fixed contact,
A mechanism unit that drives the movable contact so that the movable contact transitions between a conductive state in which the movable contact contacts the fixed contact and a non-conducting state in which the movable contact does not contact.
The arc extinguishing device for promoting the extinction of the arc discharge generated when transitioning from the conductive state to the non-conducting state is provided.
An arc transmission unit is provided between the conduction portion where the fixed contact and the movable contact come into contact with the movable contact and the arc extinguishing device so as to have the same potential as the movable contact. The circuit breaker according to claim 1.
The arc transmission portion has an arc receiving portion close to the conduction portion and an arc diffusion portion connected to the arc receiving portion and directed toward the arc extinguishing device. The circuit breaker according to claim 2.
The mechanical unit drives the movable contact so that the conduction between at least a pair of the first external terminals and the second external terminals transitions between the conductive state and the non-conducting state.
The arc extinguishing device is provided on the first external terminal side.
The arc transmission unit has a connection portion that is electrically connected to the second external terminal. The circuit breaker according to any one of claims 1 to 3.
Further, the housing including the fixed contact, the movable contact, the mechanism, the arc extinguishing device, and the arc transmission is provided.
The housing is formed in the shape of a bottomed container provided with an opening.
The fixed contact, the movable contact, the mechanism, the arc extinguishing device, and the arc transmission are configured to be assembled to the housing through the opening. The circuit breaker according to claim 4.
The mechanism unit drives the movable contact so that the conduction between at least a pair of the first external terminals and the second external terminals transitions between the conductive state and the non-conducting state.
The arc extinguishing device is provided on the first external terminal side.
The arc transmission unit has a connection portion that is electrically connected to the second external terminal.
The connecting portion has a first connecting portion along the bottom of the housing and a second connecting portion extending from the bottom to the second external terminal.
The second connection portion is connected to the first connection portion so that an urging force acts on the second external terminal. The circuit breaker according to claim 5.
The arc transmission portion is held by sandwiching the second connection portion between the second external terminal and the housing. The circuit breaker according to any one of claims 4 to 6.
The arc transmission portion is held by a fixing member made of an insulating material with respect to the housing. The circuit breaker according to claim 7.
The arc transmitting portion includes an arc receiving portion close to the conduction portion, an arc diffusion portion toward the end of the arc extinguishing device, and a connecting portion electrically connected from the arc receiving portion to the second external terminal. Have,
The fixing member holds the arc transmission portion by sandwiching the connection portion with the housing. The circuit breaker according to claim 8.
The fixing member is held by being sandwiched between the first external terminal and the housing. The circuit breaker according to claim 9.
The fixing member has an arc transmission promoting portion provided so as to sandwich the arc receiving portion between the first external terminal and the housing.
The arc transmission promoting portion includes a metal member formed of a magnetic material. The circuit breaker according to claim 10.
The fixing member is formed of a material that generates an arc extinguishing gas for cooling the arc gas generated by the arc discharge.

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