WO2019156319A1

WO2019156319A1 - Circuit breaker

Info

Publication number: WO2019156319A1
Application number: PCT/KR2018/014181
Authority: WO
Inventors: 우상현; 박진영; 함승진
Original assignee: 엘에스산전 주식회사
Priority date: 2018-02-06
Filing date: 2018-11-19
Publication date: 2019-08-15
Also published as: CN111566772B; KR102017804B1; KR20190095025A; CN111566772A

Abstract

The present invention relates to a circuit breaker, and more specifically, to an opening/closing mechanism assembly of a circuit breaker. The circuit breaker, according to one embodiment of the present invention, comprises: a case having a side plate insertion part formed on one portion thereof; a side plate having a coupling part formed on one portion thereof, and being insertedly installed in the side plate insertion part; a trip bar rotatably coupling to the coupling part; and a return spring for providing elastic force so as to enable the trip bar to return to the original position thereof, wherein the coupling part is formed as a coupling groove, and at the lower portion of the trip bar, a coupling shaft is formed so as to protrude from both sides so as to be insertedly coupled to the coupling groove.

Description

breaker

The present invention relates to a circuit breaker, and more particularly to a switchgear assembly of the circuit breaker.

In general, a circuit breaker is an electric device installed in a transmission / transmission line or a part of an electric circuit to protect an electrical facility and a load by cutting off a circuit in the event of opening or closing a load or an accident such as a short circuit. Among these, a small circuit breaker (small circuit breaker) is installed in a small distribution panel forming a low voltage circuit (15 to 30 A) of AC 110 / 220V and used for overcurrent protection and short circuit protection. Switches such as homes, stores, offices, department stores It is used as a device to conveniently open and close multiple loads in one place because it is built in the distribution panel. It is also used for the purpose of opening and closing the power supply of a machine tool, a factory facility, etc.

Small circuit breaker is a contact part composed of fixed contact point and movable contact point, open / close mechanism part for opening / closing contact point, detector part for detecting abnormal current, switch part in case of abnormal current such as over current or short circuit current. It consists of a trip part which protects a line or a load by opening a circuit, and a fire part which functions to extinguish and cool down the arc generated at the time of interruption.

1, a miniature circuit breaker according to the prior art is shown. The cover is shown removed to grasp the internal configuration. Case (1) for maintaining insulation from the outside and fixing and supporting the position of each component, terminal portion (2) connected to the power source or load, opening and closing mechanism including the handle (3), fixed contactor (4) and movable contactor The contact part containing 5, the armature 7, the magnet 15, the bimetal 16, the trip part containing the trip bar 10, etc. are shown.

Figure 2 shows the opening and closing mechanism assembly of the miniature breaker according to the prior art.

The opening and closing mechanism assembly includes a handle 3 rotatably coupled to an upper portion of the side plate 6, a trip bar 11 rotatably coupled to one side of the side plate 6, and a trip that becomes an axis of the trip bar 11. Bar pin 12, a trip bar spring 13 for providing a return force to the trip bar 11, a U pin (9) coupled to the lower portion of the handle (3) to operate the lever 10, the U pin ( It is connected to the 9) to operate the crossbar (8) and one end is composed of a lever (10) and the like bound by the trip bar (11).

In the miniature circuit breaker according to the prior art, the overcurrent breaking operation is as follows. When an overcurrent flows in the circuit, the bimetal 16 coupled to the movable contactor 3 also rapidly increases current and generates heat. This increase in current increases the magnetic flux density of the magnet 15 and the armature 7 to generate an electromagnetic force. The armature 7 is pulled in the direction in which the magnet 15 is located, releasing the lever 10 restrained by the trip bar 11, and the crossbar 8 is returned, so that the movable contactor 5 moves from the fixed contactor 4. The circuit is disconnected.

On the other hand, the bimetal 16 also causes deformation by the heat generated in the bimetal 16. The bimetal 16 is curved to push the trip bar 11 to release the lever 10 that is constrained to the trip bar 11. As a result, the movable contact 5 is disconnected from the fixed contact 4 while the crossbar 8 returns, and the circuit is interrupted.

3 is an exploded perspective view of the trip bar coupled to the side plate in FIG.

The trip bar 11 is rotatably coupled to the bottom of the side plate 6. At this time, the trip bar 11 is coupled to the side plate 6 by the trip bar pin 12. The trip bar pin 12 is provided with a trip bar spring 13 to return the trip bar 11 to its original position.

By the way, in the assembling work of the small circuit breaker according to the prior art, the operator has a hole (unsigned) formed in the side plate 6, the trip bar pin 12, the hole 11a of the trip bar 11, trip bar spring 13 Should be inserted through the hole (13a). In this way, the work is not easy because it has to hold the four parts. In addition, the tripbar spring is composed of a single torsion spring coupled to a part of the tripbar, so the force is weak, so it is difficult to maintain continuous performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object thereof is to provide a circuit breaker having improved assembly property of a trip mechanism. In addition, it is to provide a circuit breaker in which the performance of the trip mechanism is stably maintained.

Breaker according to an embodiment of the present invention is a case in which the side plate insert portion is formed; A side plate having a coupling portion formed in a portion and inserted into the side plate insert; A trip bar rotatably coupled to the coupling part; A return spring providing an elastic force to return the trip bar to its original position; wherein the coupling part is formed as a coupling groove, and a coupling shaft protrudes to both sides at the bottom of the trip bar, and is fitted into the coupling groove.

Here, the side plate insertion portion may be formed to protrude a closure for closing and supporting the coupling portion.

In addition, the inlet of the coupling portion may be formed narrower than the central portion.

In addition, the upper portion of the coupling portion protrudes forward and downward to support the rotational movement of the trip bar is formed, the front surface of the support portion may be formed in a vertical plane.

In addition, the closing portion may be formed with a contact surface in which the support surface is inclined to form an entrance surface inclined so that the support portion is easy to enter.

In addition, the trip bar may be formed with a groove that is formed as a groove to support the return spring.

In addition, the upper and lower portions of the spring mounting portion may protrude from each other, so that the spring support may be provided so that the return spring is not easily separated.

In addition, a lower portion of the trip bar may be provided with a leg portion at an intermediate portion, the coupling shaft may be formed at the leg portion, and a guide portion for supporting and guiding the return spring may be provided at the rear or front surface of the leg portion.

And, the return spring may be composed of a double torsion spring.

According to the circuit breaker according to the exemplary embodiment of the present invention, the trip bar is directly coupled by fitting to the side plate, thereby improving assembly performance.

In addition, the trip bar and the trip bar pin are integrally formed, so that the operation is consistent and the stability is improved.

In addition, the trip bar pins are removed, which reduces the number of parts, facilitates operation, and reduces the production process, thereby improving productivity.

In addition, the double torsion spring is applied to the spring for the return of the trip bar, the restoring force is excellent and the durability is increased to increase the service life.

1 is an internal perspective view of a miniature breaker according to the prior art.

FIG. 2 is a perspective view of the opening and closing mechanism assembly of FIG. 1. FIG.

3 is an exploded perspective view of the trip bar in FIG. 2.

4 is an internal perspective view of a circuit breaker according to an embodiment of the present invention.

5 is a perspective view of the case in FIG. 4.

6 is a perspective view of the opening and closing mechanism assembly in FIG. 4.

7 is an exploded perspective view of FIG. 6.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to explain in detail enough to enable those skilled in the art to easily carry out the invention, and thus the present invention. It is not intended that the technical spirit and scope of the invention be limited.

Figure 4 is an internal perspective view of the circuit breaker according to an embodiment of the present invention, Figure 5 is a perspective view of the case in Figure 4, Figure 6 is a perspective view of the opening and closing mechanism assembly in Figure 4, Figure 7 is an exploded perspective view of Figure 6. With reference to the drawings will be described in detail with respect to the small circuit breaker according to each embodiment of the present invention.

Breaker according to an embodiment of the present invention is a side plate 20, the coupling portion 25 is formed in part; A trip bar 30 rotatably coupled to the coupling part 25; In the tripping mechanism of the small circuit breaker comprising: a return spring 40 for providing an elastic force to return the trip bar 30 to the original position, the coupling portion 25 is formed as a coupling groove, the trip bar ( The lower portion of the 30 is characterized in that the coupling shaft 36 protrudes to both sides is fitted into the coupling groove.

The enclosure forming the outer shape of the circuit breaker according to the embodiment of the present invention is formed in a box shape, and the cover 60 (not shown) coupled to the upper portion of the case 60 and the lower surface are opened and coupled to the upper portion of the case 60. Can be configured.

The case 60 is provided with components such as a contact portion 66, an opening / closing mechanism portion 67, a trip portion 68, a terminal portion 69, and the like.

The case 60 is provided with a side plate insertion portion 61 into which the side plate 20 of the opening and closing mechanism 67 can be inserted.

The inner side wall of the side plate inserting portion 61 is formed with a shaft groove 62 for providing a space in which the coupling shaft 36 of the trip bar 30 can be inserted and operated. The shaft groove 62 may be formed long in the vertical direction.

Inside the side plate inserting portion 61, a closing portion 63 for closing and supporting the engaging portion 25 of the side plate 20 is formed. The closure 63 may be formed adjacent to the shaft groove 62. The closing portion 63 is formed with a contact surface 63b formed in an inclined surface so that the support portion 26 protruding from the side plate 20 is in contact with the support portion 26 of the side plate 20. do.

The side plate 20 includes a pair of side surfaces 21 and a bottom surface 22. The handle 50 of the opening and closing mechanism 67 is rotatably installed at the upper end of the side plate 20. The handle shaft 51, which is the shaft on which the handle 50 rotates, is inserted into the handle shaft hole 23.

A lever 53 for operating the crossbar 52 is connected to the handle 50 by a link pin 54 formed in a U shape.

The side plate 20 is formed with a pin operation groove (or pin operation hole) 24 through which the link pin 54 can operate.

The side plate 20 has a coupling portion 25 is formed so that the trip bar 30 can be inserted. Here, the coupling portion 25 may be formed as a coupling groove. Inlet portion 25 is preferably formed narrower than the central portion. Accordingly, when the coupling shaft 36 is fitted to the coupling portion 25, it is not easy to come off.

The support portion 26 protrudes from the upper portion of the coupling portion 25. The support part 26 protrudes forward (load side) and downward. The support part 26 supports the trip bar 30 so that the trip bar 30 is not easily separated from the coupling part 25, and supports the rotational movement of the trip bar 30.

The front surface of the support 26 may be formed in a vertical plane. The front surface of the support portion 26 (the left side in the figure is to be rearward and the right side to be forward) may be in contact with the contact surface 63b of the side plate insertion portion 61.

The trip bar 30 is provided for restraining the lever 53 in a normal state and releasing it when an accident current is generated to cause a trip operation. The trip bar 30 may be rotated by the bimetal 55 or the shaft lever 56 to release the restraint of the lever 53. The trip bar 30 is forced backward by the return spring 40. When the accident current is generated and the bimetal 55 is bent or the armature 57 is rotated and the shaft lever 56 is rotated in conjunction with the armature 57, the trip bar 30 is pushed forward and thus, the trip bar 30 ) Releases the restraint of the lever 53 so that a trip operation occurs and the circuit is cut off.

Trip bar 30 is formed in a substantially 'Y' shape. The upper end of the trip bar 30, the adjusting member 31 for adjusting the interval with the bimetal 55 is coupled.

The trip bar 30 is provided with a spring holder 32 capable of supporting the return spring 40. The spring holder 32 is preferably formed as a groove.

Spring support portions

33 and 34 are provided at the upper and lower portions of the spring holder 32 so that the return spring 40 is not easily separated. The spring supports 33 and 34 may protrude.

The trip bar 30 is provided with a leg portion 35 in the lower portion. The leg part 35 is formed at a lower middle part of the trip bar 30.

Coupling shafts 36 protrude from both sides of the leg part 35. Coupling shaft 36 is fitted to the coupling portion 25. Coupling shaft 36 is a rotation axis of the trip bar (30).

Guide portion 37 is provided on the rear or front of the leg portion (35). Guide portion 37 is the same as the width of the leg portion 35 may be formed to protrude to a predetermined thickness. The guide portion 37 may be formed in an arc or an annular shape. The guide part 37 supports the return spring 40 so as not to be biased to one side and guides the movement of the return spring 40.

Return spring 40 is provided. The return spring 40 provides an elastic force to the trip bar 30 to force the trip bar 30 to rotate backwards. The middle portion 41 of the return spring 40 is inserted into the spring holder 32 of the trip bar 30 to apply a force.

Return spring 40 may be configured as a double torsion spring. That is, the coil part 42 wound on both sides of the intermediate part 41 is formed, and the coil part 42 is fitted to the coupling shaft 36, and is supported by the guide part 37. As shown in FIG.

The overcurrent blocking operation of the trip part is as follows.

When an overcurrent or an accidental current flows in the circuit, the bimetal 55, which is coupled to the movable contact of the contact portion 66, also increases in current and generates heat.

As the current increases in the bimetal 55, the magnetic flux densities of the magnets 68 and the armature 57 are increased to generate an electromagnetic force. When the current rapidly increases in the bimetal 55, the armature 57 is attracted in the direction in which the magnet 68 is located by the generated electromagnetic force. When the armature 57 moves in the direction of the magnet 68, the shaft lever 56, which has been caught by the armature 57, rotates to push the trip bar 30 forward. As a result, the lever 53 restrained by the trip bar 30 is released, and the crossbar 52 returns, so that the movable contact of the contact portion 66 is separated from the fixed contact, and the circuit is interrupted.

It may also be blocked by heat generated in the bimetal 55. Heat is generated by an overcurrent flowing in the circuit, and the bimetals 55, which is a heat deformation material, cause curvature. The bimetal 55 is curved to push the trip bar 30 to release the lever 53 that is restrained by the trip bar 30. As a result, as the crossbar 52 returns, the movable contact is separated from the fixed contact, and the circuit is interrupted.

According to the small circuit breaker according to the exemplary embodiment of the present invention, the trip bar is directly coupled by fitting to the side plate, thereby improving assembly performance.

Embodiments described above are embodiments for implementing the present invention, and those skilled in the art may make various modifications and changes 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. That is, the protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

A case in which a side plate insertion portion is formed;

A side plate having a coupling portion formed in a portion and inserted into the side plate insert;

A trip bar rotatably coupled to the coupling part;

And a return spring providing an elastic force to return the trip bar to its original position.

The coupling portion is formed as a coupling groove,

The breaker is coupled to the coupling groove is formed on both sides of the trip bar protruding from the coupling groove.
The circuit breaker of claim 1, wherein the side plate insert is formed to protrude a closure for closing and supporting the coupling part.
The breaker of claim 1, wherein an inlet of the coupling part is narrower than a central part.
The circuit breaker of claim 2, wherein a support part protrudes forward and downward to support the rotational movement of the trip bar, and a front surface of the support part is formed in a vertical plane.
The circuit breaker of claim 4, wherein the closing part is provided with an entrance surface inclined to easily enter the support part and a contact surface in contact with the support part.
The circuit breaker of claim 1, wherein the trip bar has a spring support part formed as a groove to support the return spring.
7. The circuit breaker of claim 6, wherein a spring support part is formed at an upper portion and a lower portion of the spring holder to prevent the return spring from being easily separated.
According to claim 1, wherein the lower portion of the trip bar is provided with a leg portion in the middle, the coupling shaft is formed in the leg portion, the rear or front of the leg portion is provided with a guide portion for supporting and guiding the return spring Featured circuit breaker.
2. The circuit breaker of claim 1, wherein the return spring is comprised of a double torsion spring.