KR200406795Y1 - Circuit breaker - Google Patents

Abstract

The present invention relates to a circuit breaker having a means for protecting the movable contact point spring, and even if the breaker cuts off an accident current such as a short circuit accident, it does not cause deterioration or breakage of the spring to perform the next short circuit breaking operation. It also relates to a circuit breaker so that it can function normally.

The breaker according to the present invention for this purpose, the spring connection member having a spring seat (Spring Seat) is formed to protrude downward for connecting with the spring, and a protrusion protruding upward to connect with the movable contact;

And a shielding plate member integrally formed with the spring connection member or separately coupled to the spring connection member and shielding the spring at least partially to protect the spring from an arc.

Therefore, the circuit breaker according to the present invention can prevent deterioration or breakage of the movable contact stand spring, so that the circuit can be safely disconnected even after several trip operations, and the assembly of the movable contact stand and the spring can be maintained without flow. It can be effective.

Breaker, Movable Contact, Spring, Arc, Crossbar

Description

Circuit Breaker

1A is a cross-sectional view illustrating a main part of a conventional circuit breaker;

Figure 1b is a perspective view and a cross-sectional view showing the connection structure of the movable contact and the support spring of the conventional circuit breaker;

1C is a perspective view and a cross-sectional view showing a connection structure of a movable contact stand and a support spring of a conventional circuit breaker including an insulator connecting member as a connecting member of the movable contact point and the support spring;

Figure 2a is an exploded perspective view and a cross-sectional view showing the configuration of a movable contact stand assembly of a circuit breaker according to an embodiment of the present invention;

Figure 2b is a cross-sectional view showing the main portion of the circuit breaker equipped with a movable contact assembly according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1: fixed contact point 2: SOHO mechanism

3: movable contact table 4: switchgear

5: trip mechanism 6: handle

7, 14: spring connection member 8: spring

9: Link 10: Crossbar

11: protrusion connection part 14: spring connection member

14a: protrusion 14b: spring seat

15: Movable Contact Assembly Assembly 16: Movable Contact

The present invention relates to a circuit breaker that can protect the movable contact point spring. More specifically, the circuit breaker does not cause deterioration or breakage of the spring even after the breaker blocks a large fault current such as a short circuit current. It also relates to a circuit breaker that can exhibit the breaking performance even when performing.

In the present invention, a circuit breaker is generally used as a generic term for a circuit breaker and an earth leakage breaker called MCCB (Mould Cased Circuit Breaker). The circuit breaker operates the circuit breaker to protect the load and the line connected to the power supply when the fault current occurs several times or several tens of times higher than the normal current, and the fault current occurs even after the circuit breaker operation is performed once. In this case, it should have the capability to perform the circuit break operation normally.

This performance is called 'short circuit breaker performance' and is considered as one of the most important functions among circuit breakers. For example, the KS standard (KSC 8321) stipulates that a circuit breaker must cut off two fault currents. That is, the circuit breaker that performs the circuit break once in accordance with the occurrence of short circuit current has the capability to cut off the overcurrent many times more than the normal current after returning to energization (reset to ON state). It should be equipped. The present invention is to provide a circuit breaker having such a short-circuit breaking performance, when compared with the prior art as follows.

1A is a cross-sectional view illustrating a main part of a conventional circuit breaker.

Conventional circuit breakers include a handle (6) which provides an operation means for allowing the user to manually operate the circuit breaker in the ON position of the energized position or the OFF position of the circuit interrupted position, and connected to the power supply side, A fixed contact point 1 for providing current to the load side, a extinguishing mechanism 2 for quickly extinguishing an arc generated when an accident current is interrupted, and connected to the load side in accordance with the on / off operation of the handle 6 The movable contact table 3 which is operated at the energized position contacting the stationary contact table 1 and the breaking position separated from the stationary contact table 1, and the movable contact table 3 is connected to the handle 6, and is energized. And an opening and closing mechanism 4 for driving to the blocking position, and a tripping mechanism 5 for detecting the occurrence of an accident current on the circuit and driving the opening and closing mechanism 4 to operate in the blocking position.

In FIG. 1A, reference numeral 8 denotes a spring installed below the movable contact table 3 to provide elastic force to the movable contact table 3 in a direction separate from the fixed contact table 1,

Reference numeral 10 denotes a crossbar for supporting the movable contact bar, reference numeral 9 denotes one end connected to the crossbar 10 and a position for restraining the crossbar 10 and releasing the crossbar 10. It is a link having the other end which can be rotated to the position.

In addition, the configuration of the movable contact stand assembly of the conventional circuit breaker is a method of connecting the spring 8 directly to the spring connection protrusion 11 is integrally provided at the lower predetermined position of the movable contact stand 3, as shown in Figure 1b Electrical insulation between the movable base 3 and the spring 8 to prevent the heat generated from the movable contact 3 from being transferred directly to the spring 8 as shown in FIG. The method of assembling the spring 8 through () is applied.

The operation of the conventional circuit breaker will be described with reference to FIGS. 1A and 1B and 1C.

When the user operates the handle 6 of the circuit breaker to the ON position for power supply, that is, when the handle 6 is rotated counterclockwise in the drawing from the state shown in Fig. 1A, the handle 6 The link 9 connected in accordance with the clockwise rotation rotates in a clockwise direction and presses the crossbar 10, and the crossbar 10 descends while the movable contact table 3 supported by the crossbar 10 also descends. Therefore, the movable contact table 3 is in contact with the stationary contact table 1, and the power supply side and the load side are energized in a closed circuit, and at this time, the spring 8 is compressed by the movable contact table 3 descending.

In this state, there are two methods of breaking (opening) the circuit: operating the circuit breaker to the OFF position by manually operating the handle 6, and automatically tripping the circuit breaker according to the occurrence of an accident current. The operation will be described for two cases of blocking by using.

The operation in the case of operating the circuit breaker in the OFF position by manually operating the first handle 6 is as follows.

When the handle 6 is gripped and rotated in the OFF position, clockwise in the drawing, the link 9 connected to the lower end of the handle 6 rotates counterclockwise as opposed to the rotation direction of the handle 6. do. At this time, since the crossbar 10 is released from the restraint of the link 9, the movable contact table 3 and the crossbar 10 are moved upward by the elastic restoring force from the spring 8 in the compressed state, and thus the fixing table 1 The contact of the contact and the contact of the movable contact table 3 is separated and the circuit is opened (blocked).

Second, the operation in the case of blocking using the automatic trip function of the circuit breaker according to the occurrence of the accident current is as follows.

When the trip mechanism 5 drives the switch mechanism 4 according to the occurrence of the accident current, the switch mechanism 4 instantly rotates the handle 6 clockwise in the drawing by the elastic force of the trip spring, not shown. By clockwise rotation in the instantaneous view of the handle 6, the link 9 releases the crossbar 10 while rotating in the counterclockwise direction instantaneously. Accordingly, the movable contact table 3 and the crossbar 10 are instantaneously moved upward by the elastic restoring force from the spring 8 in the compressed state, and the contact of the fixed contact table 1 and the contact of the movable contact table 3 are instantaneously moved. This separation separates the circuit into an open (blocked) state.

On the other hand, when the fixed contact stage 1 and the movable contact stage 3 start to open due to a tripping operation caused by an accident current, a high temperature is maintained between the contact point of the fixed contact stage 1 and the contact point of the movable contact stage 2. An arc will occur. Under the ideal conditions, the arc forms an arc column in the extinguishing mechanism 2 along the movable contact stage 3 opened from the fixed contact stage 1 and is extinguished by the extinguishing mechanism 2. However, the arc may go in a direction other than the extinguishing mechanism (2). That is, when the arc of high temperature generated when the contact starts to open when the fault current is interrupted is transferred to the spring 8 instead of the extinguishing mechanism 2, the spring 8 may be deteriorated or damaged.

Therefore, the problems of the circuit breaker according to the prior art are as follows.

Due to the deterioration of the spring 8 by the arc during one short circuit break, the next iterative breaking performance cannot be guaranteed.

That is, when the breaker trips, the opening between the contact of the stationary contact 1 and the contact of the movable contact 3 depends only on the elastic force of the compressed spring 8. The spring 8 directly exposed to the arc is more likely to deteriorate or break, and if so, the spring becomes difficult to maintain its original elasticity, resulting in a slower opening speed of the movable contact 3 and a shorter distance. As a result, the circuit breaker cannot perform the normal blocking function.

In order to solve this problem, the present invention provides a circuit breaker that shields an arc generated by an accident current from being directly transmitted to a movable contact point spring, thereby preventing the spring from being deteriorated or damaged by an arc generation. The purpose.

The object of the present invention is to be connected to a fixed contact point, a movable contact point movable to a position contacting or spaced apart from the fixed contact point, a crossbar supporting the movable contact point, and the crossbar. A link having an end portion, a position for restraining the cross bar, and another end rotatable to a position for releasing the cross bar, and a spring for applying an elastic force to the movable contact point to move to a position spaced apart from the fixed contact point. In a circuit breaker having a

A spring connection member having a spring seat portion protruding downwardly for connecting with the spring, and a protrusion protruding upward for connection with the movable contact stand;

A shield plate member integrally formed with the spring connection member or separately coupled to the spring connection member, the shield plate member shielding the spring at least partially to protect the spring from an arc; By providing a breaker.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Figure 2a is an exploded perspective view and a cross-sectional view showing a configuration of a movable contact stand assembly of a circuit breaker according to an embodiment of the present invention.

The movable contact stand assembly of the circuit breaker according to the embodiment of the present invention includes a movable contact point 3, a contact 16 fixedly attached to the distal end of the movable contact point 3, a spring contact member 14, and It consists of the shielding plate member 14c and the spring 8.

The movable contact table 3 includes a through hole 3a to which the spring connecting member 14 is to be connected and a recess 3b to which the shield plate member 14c is to be connected.

As a relative structure corresponding to the through hole 3a of the movable contact table 3 above, the spring connection member 14 is provided with a protrusion 14a protruding upward. As a relative structure corresponding to the recessed groove 3b of the movable contact table 3, the shielding plate member 14c is provided with a flow preventing protrusion 14d protruding upward.

The spring connecting member 14 has a spring seat portion 14b formed to protrude downwardly for connecting with the spring 8 and a protrusion 14a protruding upward for connecting with the movable contact table 3. ).

The shield plate member 14c shields the spring 8 over its entire length or at least partly to protect the spring from the arc and is integrally formed with the spring connection member 14 as shown in the cross section on the right or the spring connection member. Modified embodiments are possible with the configuration coupled to 14 separately. Here, in the case where the shielding plate member 14c is formed integrally with the spring connecting member 14, the flow preventing protrusion 14d is a portion that protrudes upward from the shielding plate member 14c and at the same time the spring connecting portion 14 It can also be seen as a part which protrudes upward from).

The spring connecting member 14 and the shielding plate member 14c are preferably made of a synthetic resin material which is electrically insulated and low in thermal conductivity so as not to transfer heat and large current from the movable contact table 3 to the spring.

The spring 8 is coupled to the spring seat portion 14b of the spring connecting member 14 to impart an elastic force to the movable contact table 3 to move to a position spaced apart from the fixed contact table (symbol 1 in FIG. 2B). .

On the other hand, referring to Figure 2b showing the main configuration of the circuit breaker equipped with a movable contact stand assembly according to an embodiment of the present invention will be described the operation of the circuit breaker according to an embodiment of the present invention as follows.

In FIG. 2B, the portion of the circuit breaker except for the movable contact stand assembly according to the embodiment of the present invention is the same as that of the circuit breaker of the related art shown and described with reference to FIG. The description of the configuration will be omitted.

When the user operates the handle 6 of the circuit breaker to the ON position for power supply, that is, when the handle 6 is rotated counterclockwise in the drawing from the state shown in Fig. 2B, the handle 6 The link 9 connected in accordance with the clockwise rotation rotates in a clockwise direction and presses the crossbar 10, and the crossbar 10 descends while the movable contact table 3 supported by the crossbar 10 also descends. Therefore, the movable contact table 3 is in contact with the stationary contact table 1, and the power supply side and the load side are energized in a closed circuit, and at this time, the spring 8 is compressed by the movable contact table 3 descending.

In the above state, the operation in the event of a trip by the fault current is as follows.

When the trip mechanism 5 drives the switch mechanism 4 according to the occurrence of the accident current, the switch mechanism 4 instantly rotates the handle 6 clockwise in the drawing by the elastic force of the trip spring, not shown. By clockwise rotation in the instantaneous view of the handle 6, the link 9 releases the crossbar 10 while rotating in the counterclockwise direction instantaneously. Accordingly, the movable contact table 3 and the crossbar 10 are instantaneously moved upward by the elastic restoring force from the spring 8 in the compressed state, and the contact of the fixed contact table 1 and the contact of the movable contact table 3 are instantaneously moved. This separation separates the circuit into an open (blocked) state.

At this time, a high temperature arc is generated at the contact point, but since the spring 8 is shielded and protected from the arc by the shielding plate member 14c, deterioration or damage of the spring 8 due to the arc is prevented.

On the other hand, the above description is merely illustrative of the technical idea of the present invention, those of ordinary skill in the art will be able to various modifications and variations without departing from the essential characteristics of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas falling within the scope of the present invention should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, it is possible to prevent deterioration or breakage of the spring, so that the circuit can be safely disconnected even after several trip operations, and the assembly of the spring and the movable contact can be maintained more stably than before. Breakers are provided.

Claims (2)

A fixed contact table, a movable contact table movable to a position in contact with or spaced apart from the fixed contact table, a crossbar for supporting the movable contact table, one end connected to the crossbar, and restraining the crossbar 12. A circuit breaker comprising: a link having another end rotatable to a position to release the cross bar; and a spring for imposing an elastic force on the movable contact to move to a position spaced apart from the fixed contact. , A spring connection member having a spring seat portion protruding downwardly for connecting with the spring, and a protrusion protruding upward for connection with the movable contact stand; A shield plate member integrally formed with the spring connection member or separately coupled to the spring connection member, the shield plate member shielding the spring at least partially to protect the spring from an arc; breaker. According to claim 1, In order to prevent the flow of the spring connection member, the shielding plate member is further provided with a flow preventing protrusion protruding upwards, The movable contact is relatively relatively the flow preventing protrusion can be inserted and fixed A circuit breaker comprising a recessed portion.

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