KR100865833B1 - Circuit breaker - Google Patents

Abstract

The barrier side including the fixed contactor and the movable contactor and the extinguishing chamber and the load side including the opening / closing mechanism and the overcurrent external device are separated by the partition wall while preventing the breakage of the partition wall due to the increase in the internal pressure of the circuit breaker. The outer part and the opening / closing mechanism which accommodate the blocking part and the extinguishing chamber 6 including the fixed contact 3, the movable contact 5 and the holder 9 in the case 1, and include the trip bar 17. 4) is housed in the middle cover 2, and includes a blocking portion side including the fixed contactor 3 and the movable contactor 5 and the extinguishing chamber 6, and an opening and closing mechanism 4 and an overcurrent external device 15. The load side is separated by a connecting plate 14 having conductivity.

Circuit breaker

Description

Circuit breaker {CIRCUIT BREAKER}

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows schematic structure of the circuit breaker concerning one Embodiment of this invention.

FIG. 2 is an enlarged longitudinal sectional view of a portion of the connecting plate 14 of the circuit breaker of FIG. 1.

FIG. 3 is a top view of the circuit board of FIG. 1 seen in a viewpoint direction D2 showing an enlarged portion thereof. FIG.

FIG. 4 is a longitudinal sectional view seen from a viewpoint direction D1 showing an enlarged portion of the connecting plate 14 of the circuit breaker of FIG. 1.

5 is an enlarged longitudinal sectional view showing a portion of a breaker of the circuit breaker of FIG. 1;

(Explanation of symbols for the main parts of the drawing)

1: case 2: middle cover

3: fixed contact 4: opening and closing mechanism

5: movable contact 6: SOHO

7: fixed contact 8: movable contact

9: holder 10: sidewall

11: grid 12: protection board

13 lead wire 14 connection board

15: overcurrent external device 16: load-side terminal

17: trip bar 18: top cover

19: arc

Field of technology

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and is particularly suitable for applying to a method of protecting a load-side open / close mechanism and an overcurrent external device from hot gas emitted from an arc generator.

Prior art

In low voltage converters, circuit breakers, such as a circuit breaker and an earth leakage circuit breaker, are used in order to interrupt the short circuit current or load current which flow through a load.

The circuit breaker includes a contactor portion provided with a fixed contactor and a movable contactor, a holder for supporting the movable contactor in a rotatable manner, an arc extinguishing device for extinguishing arcs generated from the contactor portion, and an opening / closing operation of opening and closing the movable contactor. A mechanism, an external mechanism for out-locking the closing mechanism of the opening-closing mechanism, and an overcurrent external device for detecting an overcurrent to operate the external mechanism are provided, and these component parts are provided with a cover mounted on the case body and its upper surface. It is accommodated in the mold case which consists of.

In such a circuit breaker, when a large current such as a short circuit current is interrupted, an arc is generated between the fixed contactor and the movable contactor, and a high temperature and high pressure arc gas containing metal particles or resin evaporated by arc heat enters the circuit breaker. To be full. For this reason, the opening / closing mechanism and the overcurrent external device may be damaged, resulting in poor input or external failure, carbonization of the insulated container or internal mold parts, or adhesion of soot, resulting in lowering the electrical resistance, resulting in poor withstand voltage. There is this.

For this reason, for example, Patent Literature 1 divides a mold case of a circuit breaker into a case body, a middle cover attached to the upper surface of the case body, and a top cover covering the upper surface of the middle cover, and the fixed contactor and the movable contactor. A method of shielding a movable part such as an opening / closing mechanism from an fusion of a metal material or an insulating material by arc heat by storing a contactor portion and an arc extinguishing device in a case body and storing the opening / closing mechanism and the external mechanism in a middle cover are disclosed. have.

In addition, in the specification and drawings of Japanese Patent Application No. 2005-50268 (corresponding Korean application 1020060014525), which is a source, the insulation between phases due to the return of arc gas in the configuration disclosed in Patent Document 1 is described. In order to suppress the deterioration, the partition between the poles which surrounds the contact portion and the arc extinguishing device at each pole and insulates them from each other, and the contact between the contact portion of each pole and the overcurrent extraneous devices arranged behind it are isolated. In the meantime, the method of providing a partition bulkhead is disclosed.

Patent Document 1: Japanese Patent Application Laid-Open No. 2005-228669

However, in the method disclosed in the specification and drawings of Japanese Patent Application Laid-Open No. 2005-50268, the partition wall between the poles and the middle partition partition wall are integrally formed on the case body or the middle cover by molding. For this reason, when arc gas of high temperature and high pressure generate | occur | produces at the time of interruption of a large electric current, there exists a problem that an internal pressure rises and a partition is destroyed. In addition, when the space for arranging the partition walls cannot be sufficiently taken due to the internal structure, the thickness of the partition walls becomes thin, which makes it difficult to secure the strength of the partition walls.

Accordingly, an object of the present invention is to isolate the barrier side including the fixed contactor and the movable contactor and the extinguishing chamber, and the load side including the opening / closing mechanism and the overcurrent external device, by preventing the breakage of the partition wall due to an increase in the internal pressure. It is to provide a circuit breaker that can be.

MEANS TO SOLVE THE PROBLEM In order to solve the above-mentioned subject, according to the circuit breaker of Claim 1, the fixed contactor provided with the fixed contact, the movable contactor provided with the said movable contact and the movable contact which can be opened and closed, and the said movable contactor are rotatably supported. An extinguishing chamber for arcing between the holder, the fixed contact point and the movable contact; an opening / closing mechanism for opening and closing the movable contactor; an external mechanism for out-locking the opening / closing mechanism; An overcurrent external device to be activated, a lead wire connected to the movable contactor, a case accommodating the fixed contactor, the movable contactor, the holder and the arc chamber, the opening / closing mechanism and the external mechanism, and the case A cover mounted to the shielding side, the fixed contactor and the movable contactor including a extinguishing chamber; Isolate load side including a group switching mechanism and the overcurrent inoe apparatus, characterized by comprising a connecting plate having conductivity for connecting the lead wire and the overcurrent inoe device.

Thereby, in order to isolate | separate the interruption | block part side containing a fixed contactor and a movable contactor, and an arc extinguishing chamber, and the load side containing an opening-closing mechanism and an overcurrent external device, it becomes possible to use a conductive connecting plate as a partition. For this reason, even when the space for arranging the partition walls is not sufficiently taken, the strength of the partition walls can be ensured, and the destruction of the partition walls due to the increase in the internal pressure can be prevented. As a result, even when the high temperature and high pressure arc gas is filled to the cut-off part side, the high temperature and high pressure arc gas can be prevented from invading the load side, and the opening / closing mechanism and the overcurrent external device on the load side are damaged, resulting in poor input or external failure. It is possible to prevent the insulation container or the inner mold part on the load side from being carbonized or adhered by soot to cause a breakdown voltage defect.

Moreover, according to the circuit breaker of Claim 2, the said connection board is a metallic connection board, It is characterized by the above-mentioned.

Moreover, according to the circuit breaker of Claim 3, the said connection board is arrange | positioned so that it may overlap inward from the edge part of the said case and the said cover. It is characterized by the above-mentioned.

Thereby, even when the pressure on the side of the blocking portion rises, the connecting plate can be pressed against the case and the cover, thereby preventing the connecting plate from peeling off or shifting the position of the connecting plate. For this reason, even when an arc generate | occur | produces in the interruption | blocking part side, it can prevent the arc gas from invading to a load side, the damage of an opening / closing mechanism and an overcurrent external device can be suppressed, and an injection failure or an external defect can be reduced.

As described above, according to the present invention, by using a metallic connecting plate as a partition wall that isolates the breaker side including the fixed contactor and the movable contactor and the arc chamber, and the load side including the opening and closing mechanism and the overcurrent external device, Even when the high temperature and high pressure arc gas fills the blocking portion side, the breakage of the partition wall due to the increase in the internal pressure can be prevented, and the high temperature and high pressure arc gas can be prevented from entering the load side.

EMBODIMENT OF THE INVENTION Hereinafter, the circuit breaker which concerns on embodiment of this invention is demonstrated, referring drawings.

1 is a longitudinal cross-sectional view showing a schematic configuration of a circuit breaker according to an embodiment of the present invention.

In Fig. 1, the circuit breaker supports and opens and closes the linear linear movable contactor 5 and the movable contactor 5, which can be opened and closed between the fixed contactor 3 fixed to the case 1 and the fixed contactor 3. The holder 9 of the insulator supported rotatably via the shaft is provided. A movable contact 8 is provided at the tip of the movable contact 5, a fixed contact 7 is provided at one end of the fixed contact 3, and a power supply terminal is integrated at the other end of the fixed contact 3. It is formed. Then, these fixed contacts 3, movable contacts 5 and holders 9 constitute a breaker of the circuit breaker. In addition, the shielding section is provided with an arc extinguishing chamber 6 for extinguishing the arc generated due to the opening and closing operation between the fixed contact 3 and the movable contact.

Here, the side wall 10 which is a support body of an insulator is provided in the arc-extinguishing chamber 6, The several side grid 10 which consists of magnetic bodies is laminated | stacked and supported by predetermined space | interval at the side wall 10. As shown in FIG. . And the grid 11 is comprised by the U-shape in which the notch which passes the movable contact 5 is formed. In addition, an arc gas outlet is provided in front of the blocking portion, and the arc gas outlet is closed by a shield plate 12 of an insulator which prevents ingress of foreign matter, and the shield plate 12 is shaped by the shape of the support. It is fixed.

Moreover, the circuit breaker is provided with the opening / closing mechanism 4 which makes opening / closing operation between the movable contactor 5 and the fixed contactor 3, and the opening / closing mechanism 4 points the opening / closing shaft integral with the holder 9 Thus, the movable contact 5 can be opened and closed.

In addition, the circuit breaker is provided with an out-of-mechanism device for out-of-locking the opening / closing mechanism 4 and an over-current out- device 15 for detecting an over-current to operate the out-of-body mechanism. Here, in the overcurrent external device 15, a bimetal, a heater conductor, an armature, and an electromagnet are assembled, and the machine is operated by a thermal or electronic type based on the detection result of the overcurrent flowing through the load-side terminal 16. Can cause warping. And the outside mechanism can pull out the lock of the opening / closing mechanism 4 by transmitting the mechanical bending generate | occur | produced in the overcurrent outside device 15 to the opening / closing mechanism 4 via the trip bar 17. FIG.

In addition, the flexible lead wire 13 is connected to the rear end of the movable contact 5, and the lead wire 13 is connected to the overcurrent external device 15 through a connection plate 14 made of a conductive metal L-shape. Is connected to. And as a metal material which comprises the connection board 14, copper, stainless steel, an aluminum alloy, etc. can be used, for example.

Here, the insulating container of a circuit breaker can be comprised by the case 1, the middle cover 2, and the top cover 18 made from mold resin. Then, the blocking portion and the extinguishing chamber 6 including the fixed contact 3, the movable contact 5 and the holder 9 are accommodated in the case 1, and the external mechanism including the trip bar 17 and the opening and closing are provided. The mechanism 4 is housed in the middle cover 2. The middle cover 2 can be mounted on the case 1, and the top cover 18 can be mounted on the middle cover 2. Moreover, in order to connect the toggle link of the opening-closing mechanism 4 to the holder 9, you may make it provide the slit in the partition of the bottom part of the middle cover 2.

Then, the connecting portion 14 made of metal includes a blocking portion side including the fixed contactor 3, the movable contactor 5, and the extinguishing chamber 6, and a load side including the opening / closing mechanism 4 and the overcurrent external device 15. It is isolated. Here, in the case where the breaker side and the load side are separated by the connecting plate 14, it is preferable to arrange the connecting plate 14 so as to overlap the ends of the case 1 and the middle cover 2 from the inside.

In addition, although the block part of the center pole part was shown in the structure of FIG. 1, the inside of an insulating container is partitioned by the partition between phases, and can accommodate the block part of each phase in each partitioned space.

Then, in the state where the fixed contact 3 and the movable contact 5 are closed, the power supply side terminal → fixed contact 3 → movable contact 5 → lead wire 13 → connecting plate 14 → overcurrent external device 15 ) Current may flow through the path of the load terminal 16.

When a large current such as a short circuit current flows through the load-side terminal 16, the overcurrent external device 15 operates, and the opening and closing mechanism 4 of the opening and closing mechanism 4 is performed through the trip bar 17, and the opening and closing shaft is set as the point. By rotating the holder 9, the movable contact 5 is opened from the fixed contact 3.

Then, when the movable contact 8 and the fixed contact 7 are opened, the current flowing to the load is interrupted, and an arc occurs between the fixed contact 3 and the movable contact 5. And when an arc generate | occur | produces, the high temperature and high pressure arc gas containing the metal particle and resin evaporated by arc heat fills inside the interruption | block part.

Here, the interruption part side including the fixed contactor 3, the movable contactor 5, and the extinguishing chamber 6, and the load side including the opening / closing mechanism 4 and the overcurrent external device 15 are isolated by the connecting plate 14. Therefore, even when the high temperature and high pressure arc gas fills the blocking part side, the high temperature and high pressure arc gas can be prevented from invading the load side. For this reason, the opening / closing mechanism 4 of the load side and the overcurrent external device 15 are damaged, a failure of an injection or an external failure is caused, the insulation container or an internal mold part of a load side carbonizes, or a fume adheres, and a breakdown voltage fault is prevented. Can be prevented.

In addition, by using the metallic connecting plate 14 as the partition wall, even when the space for arranging the partition wall is not sufficiently taken, the strength of the partition wall can be ensured, and the partition wall due to the increase in the internal pressure on the side of the blocking portion can be obtained. It can prevent destruction.

FIG. 2 is a longitudinal sectional view showing an enlarged portion of the connecting plate 14 of the circuit breaker of FIG. 1, and FIG. 3 is a perspective view showing an enlarged portion of the connecting plate 14 of the circuit breaker of FIG. 4 is a longitudinal cross-sectional view seen from a viewpoint direction D1 showing an enlarged view of a portion of the connecting plate 14 of the circuit breaker of FIG. 1.

In FIGS. 2-4, the connection board 14 is arrange | positioned so that it may overlap inward with the edge part of the case 1 and the middle cover 2 (parts A and B of FIG. 2, C of FIG. part). Thereby, even when the pressure on the blocking part side rises, the connecting plate 14 can be pressed against the case 1 and the middle cover 2 so that the connecting plate 14 is peeled off or the connecting plate 14 It is possible to prevent the position shift. For this reason, even when an arc occurs in the interruption | blocking part side, arc gas can be prevented from invading to a load side, the damage of the opening-closing mechanism 4 and the overcurrent external device 15 can be suppressed, and an injection fault or an external fault is reduced. can do.

FIG. 5 is an enlarged longitudinal sectional view showing a portion of the breaker of the circuit breaker of FIG. 1. FIG.

In FIG. 5, when the movable contact 8 and the fixed contact 7 are opened, an arc 19 occurs between the fixed contact 3 and the movable contact 5. And when the arc 19 generate | occur | produces, the arc 19 is segmented by the grid 11 and arc extinguishing is performed.

Moreover, when the arc 19 generate | occur | produces, the high temperature and high pressure arc gas containing the metal particle and resin evaporated by arc heat fills inside the interruption | block part, and flows to a load side. Then, when the arc gas flows to the load side, it is blocked by the connecting plate 14 and changes direction in the direction of the arc extinguishing chamber 6.

For this reason, the flow volume of the arc gas which penetrates into the arc-extinguishing chamber 6 side can be increased, and the arc 19 which generate | occur | produced between the stationary contact 3 and the movable contact 5 is quickly moved to the arc-extinguishing chamber 6, Can promote arc extinguishing.

As described above, according to the present invention, by using a metallic connecting plate as a partition wall that isolates the breaker side including the fixed contactor and the movable contactor and the arc chamber, and the load side including the opening and closing mechanism and the overcurrent external device, Even when the high temperature and high pressure arc gas fills the blocking portion side, the breakage of the partition wall due to the increase in the internal pressure can be prevented, and the high temperature and high pressure arc gas can be prevented from entering the load side.

Claims (3)

A fixed contact with a fixed contact, A movable contact provided with the fixed contact and a movable contact that can be opened and closed; A holder for movably supporting the movable contact; An arc extinguishing chamber for extinguishing an arc generated between said fixed contact and said movable contact; An opening and closing mechanism for opening and closing the movable contactor; An out-of-body mechanism for out-locking the opening / closing mechanism; An overcurrent external device which detects overcurrent and operates the external device, A lead wire connected to the movable contact; A case accommodating the fixed contactor, the movable contactor, the holder and the arc chamber; A cover accommodating the opening / closing mechanism and the external mechanism and attached to the case; It is provided with a connection plate having a conductivity which isolates the interruption | block part side containing the said fixed contactor and a movable contactor, and the arcing chamber, and the load side containing the said switching mechanism and an overcurrent external device, and connects the said lead wire and the said overcurrent external device. Circuit breaker characterized by. The method of claim 1, The said circuit board is a metallic circuit board, The circuit breaker characterized by the above-mentioned. The method according to claim 1 or 2, The connecting plate is disposed so as to overlap the end of the case and the cover from the inside.

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