KR101768498B1

KR101768498B1 - Circuit Breaker

Info

Publication number: KR101768498B1
Application number: KR1020150063858A
Authority: KR
Inventors: 송희찬
Original assignee: 지에이치산전주식회사
Priority date: 2015-05-07
Filing date: 2015-05-07
Publication date: 2017-08-22
Also published as: KR20160131450A

Abstract

And a trip device for driving the trip bar. The trip device includes a trip device for turning off the power source, a trip device for turning off the power source, The stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness of the stiffness, )Wow; A bimetal 20 formed at a lower portion of the stator 10 and formed in an "?" Shape and curved when an overcurrent flows; An armature (30) which is attracted by a suction force of the stator (10) when an overcurrent flows into the converter due to an abnormal current; A lower bending portion 41 formed on one side of the second bending portion 43 and an upper support plate portion 42 formed on the other side of the second bending portion 43. The upper support plate portion 42 is supported by the armature 30 And a supporting and restoring force providing plate part (40) fastened to the rear surface of the armature (30) to provide a restoring force while grasping the armature (30).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit breaker,

The present invention relates to a miniature earth leakage breaker having a structure-improved instantaneous trip device, and more particularly, to a small earth leakage breaker having a structure that protects a circuit and an electric appliance by blocking a relatively large short- To a small earth leakage breaker equipped with an improved instantaneous trip device.

In recent years, as the IEC (K61009-1, Residential Circuit Breaker with overcurrent protection device for residential and similar purposes) is changed in the standard KS of residential earth leakage circuit breaker, the description of short circuit breaking performance must be satisfied, A technique that satisfies the short-circuit performance has become necessary.

Generally, a small overcurrent circuit breaker should be able to function instantly even if the short circuit performance is over 500A in accordance with the IEC standard, while reducing its size.

According to the specification of such a small overcurrent circuit breaker, amateur devices have been developed in order to enable tripping due to the magnetic force of the coil when an overcurrent occurs.

In the conventional art for such an object, Patent No. 10-0923683 discloses an amateur device applied to a small overcurrent circuit breaker. The overcurrent circuit breaker disclosed in this patent document comprises a bimetal, a fixed core, an armature and a fixed base, The upper yoke is configured to include a hinge region to which the armature is rotatably coupled.

In the overcurrent circuit breaker equipped with the armature, when the short circuit current larger than the overcurrent flows in the energizing circuit, the armature moves to the fixed core due to the attracting force to turn the trip bar of the circuit breaker into the trip position to cut off the short circuit current.

However, in the overcurrent circuit breaker disclosed in the above patent document, there is a limitation in the installation space because a fixing table for fixing the armature is additionally provided, thereby making it difficult to manufacture the breaker relatively small.

In addition, since the armature is hinged to the yoke without the portion for providing the elastic force in the returning operation of the armature, there is a disadvantage that the assembling property is poor and the manufacturing is not easy.

5 is a block diagram of an amateur device of a conventional miniature earth leakage breaker.

KR 10-0923683 B1 KR 10-1098226 B1

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems of the conventional circuit breaker as described above, and it is an object of the present invention to provide a circuit breaker comprising a thermal motion mechanism using a bimetal and an armature using a magnetic resistance, And it is an object of the present invention to provide a circuit breaker which is easy to assemble and manufacture, and can accurately perform a current shutoff operation.

The present invention provides a simple structure by minimizing parts by implementing a suitable shape to integrate the support by a separate elastic part or insulator that is supported and controlled by conventional amateurs and can share existing stator fixing means Provided is a circuit breaker capable of suppressing erroneous operation due to the addition of unnecessary parts and occurrence of a fault and preventing unnecessary waste of resources.

And a trip device for driving the trip bar, the circuit breaker comprising: an upper housing, a lower housing, a handle for applying or cutting off power, a trip bar for tripping the power supply by tripping the handle,

The trip device includes:

And a first bending portion designed to raise a suction force due to an electromagnetic force in response to a current always flowing in a position to close the converter. The first bending portion is located at the upper portion and is fastened to the lower housing by a fixing piece passing through the first fastening hole 11. [ A fixed stator 10;

A bimetal 20 formed at a lower portion of the stator 10 and formed in an "?" Shape and curved when an overcurrent flows;

An armature (30) which is attracted by a suction force of the stator (10) when an overcurrent flows into the converter due to an abnormal current;

A lower bending portion 41 formed on one side of the second bending portion 43 and an upper support plate portion 42 formed on the other side of the second bending portion 43. The upper support plate portion 42 is supported by the armature 30 A supporting and restoring force providing plate 40 which is engaged with the rear surface of the armature 30 to provide a restoring force while grasping the armature 30;

Wherein the circuit breaker comprises an instantaneous trip device.

The present invention is equipped with a thermal mechanism using a bimetal and an armature using a magnetic resistance, so that an abnormal current due to an overcurrent or a short circuit is protected from flowing to a circuit or a converter.

Further, since the armature is supported and guided by using the lower housing without providing a separate fixing mechanism for supporting the armature, it is easy to assemble and manufacture, and the assembling structure is simple, .

The instantaneous trip device of the miniature earth leakage breaker according to the present invention realizes an instantaneous operation only by minimizing the economic cost reduction and the minimum failure factor by implementing the amateur support which integrates the support of the armature and the returning function of the elasticity, It is advantageous to avoid the problem. As a result, it is possible to provide an instantaneous operation type small circuit breaker having the most efficient structure by eliminating the malfunction of the use and the risk of failure at the same time as the benefit of the manufacturing process.

1 is a perspective view of a miniature earth leakage breaker according to the present invention;
FIG. 2 is a main part of an embodiment of the instantaneous trip device of the miniature earth leakage breaker according to the present invention. FIG.
FIG. 3 is a cross-sectional view of an amateur and amateur support assembly example of the instantaneous trip device of the present invention
4 shows an embodiment of the instantaneous trip device and the stator fixing method according to the present invention.
5 is a block diagram of an amateur device of a conventional small earth leakage breaker.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a miniature earth leakage breaker having a structured instantaneous trip device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view of a miniature earth leakage breaker according to the present invention, FIG. 2 is a main part of an embodiment of the instantaneous trip device of the miniature earth leakage breaker according to the present invention, FIG. 3 is an assembling example of an amateur and an armature support And Fig. 4 shows an embodiment of the instantaneous trip device and the stator fixing method of the present invention.

1 to 5, a miniature earth leakage breaker having a structure-improved instantaneous trip device according to an embodiment of the present invention includes upper and lower housings, a handle for applying or cutting off power, A trip bar for cutting off the power supply, and a trip device for driving the trip bar.

As shown in FIGS. 1 to 5, the trip device includes a stator 10, a bimetal 20, an armature 30, and a supporting and restoring force providing plate 40. The stator 10 is provided with a first bending portion designed to raise a suction force due to an electromagnetic force in response to a current flowing at a time of closing the converter, And is fastened and fixed to the lower housing.

The bimetal 20 is partially formed in the lower portion of the stator 10 and is formed in a "? &Quot; shape and curved when the overcurrent flows. The armature 30 is attracted by the attracting force of the stator 10 when an overcurrent flows into the converter due to an abnormal current. The supporting and restoring force providing plate 40 includes a lower fixing plate portion 41 formed on one side of the second bending portion 43 and an upper supporting plate portion 42 formed on the other side of the second bending portion 43, The plate portion 42 is joined to the rear surface of the armature 30 to provide a restoring force while gripping the armature 30. [

1 to 5, in the miniature earth leakage breaker having the structured instantaneous trip device according to the embodiment of the present invention, a circular protrusion 33 is formed on the rear surface of the armature 30, An insertion groove 42a corresponding to the circular protrusion 33 is formed in the upper support plate portion 42. The protruding portion 33 is inserted into the insertion groove 42a and then joined together by at least one method selected from the group consisting of caulking, riveting, welding, and brazing, whereby the armature 30 and the supporting and restoring force providing plate 40 are coupled .

1 to 5, in the miniature earth leakage breaker having the structure-improved instantaneous trip device according to the embodiment of the present invention, a second fastening hole 41a is formed in the lower fastening plate 41 And the fixing piece passes through the first fastening hole 11 and the second fastening hole 41a and is fixed. A portion of the bimetal 20 is brought into contact with the lower portion of the stator 10 and the upper support plate portion 42 of the support and restoring force providing plate portion 40 is fixed to the lower surface of the bimetal 20 in contact with each other. It is preferable that the width of the metal lower body 20b of the bimetal 20 at the portion to be coupled with the stator 10 coincides with the width of the lower fixed plate portion 41. [

However, in this description, the description will be focused on the instantaneous trip device added to the present invention, and the general operation and well-known facts of the circuit breaker will be omitted. The stator 10 and the armature 30 are sufficiently magnetized and the stator 10 sucks the armature 30 when a large current that is insufficient to secure the operation time due to the bending force of the bimetal 20 flows.

Initially, the armature 30, which is fixed at a position spaced apart from the trip bar by the elasticity of the plate portion 40 provided with the armature support and restoring force, is pulled by the electromagnetic force toward the stator 10, The suction force is absorbed until the front face of the armature 30 is brought into close contact with the bimetal 20 by overcoming the elasticity of the plate portion 40.

When the armature 30 rotates in the direction of the stator 10, as the tripping bar of the armature pushes the trip bar and the trip bar rotates, the linkage of the circuit breaker is released from the locked state and the circuit breaker opens the converter to block the abnormal current .

Wherein the fixed portion and the bimetal are provided with fastening holes corresponding to the upper and lower portions, respectively, and the bimetals of the stator are sequentially positioned and bolted to each other.

In the present invention, the fixing part and the bimetal are provided with fastening holes corresponding to the upper and lower parts, respectively, so that the fixing part and the bimetal can be bolted together while being sequentially positioned. Further, in the present invention, the stator is provided with a bending portion extending in the direction of the armature from the side to attenuate the magnetic path resistance and to form an air gap opposed to the armature, thereby generating an electromagnetic attractive force.

In addition, the armature is provided with an armature support and a means for securing it. The armature arm is provided with a hole and an armature fixing means which are simultaneously fixed when the stator is fixed. The armature arm is composed of an elastic body, To return to a position where they can have

In the present invention, the bimetal and the amateur of the instantaneous trip device at the normal current are considered such that the curvature amount and the suction force do not reach the operating load of the trip bar, so that the circuit breaker continues to conduct current and, at the overcurrent current of the predetermined current range, The circuit is cut off by the force.

In case of a large abnormal current which can not be blocked within a safe time due to the bending force of bimetal, the amateur that operates by the electromagnetic attraction between the armature and the stator wins the operation load of the trip bar and cuts off the circuit breaker within the safe time range .
The trip device includes a stator 10 having an upper body 10a and a lower body 10b in a shape of a letter C; A bimetal 20 partially formed at a lower portion of the stator 10 and having a metal upper body 20a and a metal lower body 20b formed in a "B" shape and curved when an overcurrent flows; An armature (30) which is attracted by a suction force of the stator (10) when an overcurrent flows into the converter due to an abnormal current; A lower fixing plate 41 formed on one side of the second bending part 43 and an upper supporting plate part 42 formed on the other side of the second bending part 43 by being bent from the lower fixing plate part 41, And a support and restoring force providing plate part 40 which is connected to the rear surface of the armature 30 to provide a restoring force while grasping the armature 30. A second fastening hole 41a is formed in the lower fastening plate 41 and a fastening piece is fastened to the first fastening hole 11 formed in the lower body 10b of the stator 10 and the second fastening hole 11 formed in the lower fastening plate 41, And the metal lower body 20b of the bimetal 20 is brought into contact with the lower body 10b of the stator 10 by passing through the fastening holes 41a. The lower protrusion plate 41 of the supporting and restoring force providing plate 40 is inserted under the metal lower body 20b of the bimetal 20 so as to be in contact with the lower protrusion plate 41, The lower body 10b of the stator 10 and the metal lower body 20b of the bimetal 20 and the lower fixing plate 41 of the supporting and restoring force providing plate 40 are fixed to the body 1a together with fixing pieces.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but on the contrary, &Lt; RTI ID = 0.0 > and / or < / RTI >

It is to be understood that the appended claims are intended to supplement the understanding of the invention and should not be construed as limiting the scope of the appended claims.

10: Stator
11: first fastening hole
20: Bimetal
30: Amateur
40: Plate providing support and restoring force
41: Lower fixed plate portion
42: upper support plate
43: second bending portion

Claims

delete

And a trip device for driving the trip bar, the circuit breaker comprising: a lower housing (1); a handle for applying or cutting off power to the lower housing (1); a trip bar
The trip device includes:
And a first bending portion designed to raise a suction force due to an electromagnetic force in response to a current always flowing in a position to close the converter. The first bending portion is located at the upper portion and is fastened to the lower housing by a fixing piece passing through the first fastening hole 11. [ A stator 10 fixed to the upper body 10a and the lower body 10b to form a b-shape;
A bimetal 20 partially formed at a lower portion of the stator 10 and having a metal upper body 20a and a metal lower body 20b formed in a "B" shape and curved when an overcurrent flows;
An armature (30) which is attracted by a suction force of the stator (10) when an overcurrent flows into the converter due to an abnormal current;
A lower fixing plate 41 formed on one side of the second bending part 43 and an upper supporting plate part 42 formed on the other side of the second bending part 43 by being bent from the lower fixing plate part 41, A supporting and restoring force providing plate part (40) which is connected to the rear surface of the armature (30) to provide a restoring force while grasping the armature (30);
, &Lt; / RTI >
A second fastening hole 41a is formed in the lower fastening plate 41 and a fastening piece is fastened to the first fastening hole 11 formed in the lower body 10b of the stator 10 and the second fastening hole 11 formed in the lower fastening plate 41, Is fastened through the fastening holes 41a,
The metal lower body 20b of the bimetal 20 is brought into contact with the lower body 10b of the stator 10,
A lower support plate portion 41 of the supporting and restoring force providing plate portion 40 is inserted under the metal lower body 20b of the bimetal 20 so that the upper and lower fixing plate portions 41, In the protruding body 1a
The metal lower body 20b of the bimetal 20 and the lower fixing plate portion 41 of the supporting and restoring force providing plate 40 are fixed together with the fixing piece 10 together with the lower body 10b of the stator 10, Miniature earth leakage breaker with instantaneous trip device.

3. The method of claim 2,
A circular protrusion 33 is formed on the rear surface of the armature 30,
An insertion groove 42a corresponding to the circular protrusion 33 is formed in the upper support plate 42,
The circular protrusions 33 are inserted into the insertion grooves 42a and then joined together by at least one method selected from caulking, riveting, welding and soldering so that the armature 30 and the supporting and restoring force providing plate 40 are coupled Wherein the short circuit breaker is structured as a simple circuit breaker.

3. The method of claim 2,
Wherein a width of the metal lower body 20b of the bimetal 20 at a portion where the stator 10 is engaged is fixed to match the width of the lower fixed plate portion 41. [ Earth leakage breaker.