KR20150053610A - Circuit breaker - Google Patents

Abstract

The present invention relates to a circuit breaker, and more specifically, to a circuit breaker comprising: a case; a fixed board having a fixing contact point, and fixed and installed on one side of the case; a swinging deck having a swinging contact point, and rotatably installed on one side of the case; and an arc extinguishing unit extinguishing arc generated between the fixing contact point and the swinging contact point, wherein the arc extinguishing unit comprises: an arc induction member transmitting arc generated between the fixing contact point and the swinging contact point to an arc chamber as one end is enlarged toward the arc chamber, and the other end is adjacent to the fixing contact point and fixed on one surface of the fixed board; and the arc chamber having a plurality of grids inside, and dividing, cooling, and extinguishing arc transmitted from the arc induction member.

Description

{CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring breaker, and more particularly, to a wiring breaker capable of rapidly guiding an arc into an arc chamber.

In general, a Miniature Circuit Breaker is installed in the distribution board and protects the human body and property by protecting the load device from the fault current by opening the line when the fault current flows to the equipment connected to the line or line.

FIG. 1 is a perspective view showing a conventional small-sized wiring breaker according to the prior art, which includes a fixing table 10 and a movable table 11 for connecting a power supply path between a power source side and a load side, A latch 13 for making the movable base 11 operable as an open or closed position and a trip bar 13 for contacting and restraining the latch 13 at one end of the latch 13 An instantaneous coil assembly 15 disposed between the movable base 11 and the trip bar 14 for blocking instantaneous current by rotating the trip bar 14 when instantaneous current flows, And a soot unit 17 for extinguishing an arc generated when the movable contact 11a of the fixed base 10 is separated from the fixed contact 10a of the fixed base 10. [

The arc in the small-size wiring breaker occurs when the movable contact 11a of the movable base 11 is detached from the stationary contact 10a of the stationary table 10 when a short-circuit current is generated. The arc occurs due to the inertia of the current at both contacts do.

The arc generated at the stationary contact 10a is guided to the arc chamber 18 by an arc runner 19 and extinguished the arc in the arc chamber 18. [

At this time, the arc chamber 18 is composed of a flame-retardant insulating plate of a box structure having a receiving space therein, and a V-shaped magnetic plate called a grid is provided in several layers at appropriate intervals , The arc is moved to the end of the grid to cool the arc, and the arc is divided by shortening the arc.

More detailed description will be given below. When the fixed table 10 and the movable table 11 are opened, the converter is switched to the open state, and an arc is generated when the movable table 11 is opened from the fixed table 10. The generated arc stays between the movable stage 11 and the fixed stage 10 in the initial state and then the arc generated by the electromagnetic driving force generated as the distance between the movable stage 11 and the fixed stage 10 increases, And moves to the arc chamber 18 side. At this time, the arc runner 19 serves to guide the arc to the arc chamber 18 side. Thus, the arc transferred in the arc chamber 18 is cooled and cut between the grids, and is completely extinguished at the zero point of the current to interrupt the abnormal current.

However, the arc runner 19 may not induce the arc into the arc chamber 18, and in this case, the arc furnace is delayed and the fault current is not blocked. In addition, there is a problem that the blocking performance is deteriorated, the scattering of the abnormal current interruption and the operational reliability become poor.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a wiring breaker capable of quickly leading an arc to prevent burning of a load device, improving the breaking performance, and securing the reliability of the breaking operation It is a technical task.

According to an aspect of the present invention, there is provided a circuit breaker including a fixing table, a movable table, and a Loop unit. The fixing table has a fixed contact and is fixedly installed inside the case. The movable base has a movable contact and is rotatably installed inside the case. The SOHO unit includes an arc chamber and an arc guiding member. The arc chamber has a plurality of grids therein and exerts an arc generated between the movable contact and the stationary contact. An arc guide member is disposed between the stationary contact point of the fixed table and the arc chamber, the other end of the arc guide member is fixed to one surface of the stationary table adjacent to the stationary contact point and one end portion extends toward the arc chamber, And the arc generated at the fixed contact is guided to the arc chamber.

In one aspect of the present invention, an arc guide member is additionally provided in an existing SOHO unit to quickly induce an arc, thereby preventing burnout of the product, improving the breaking performance and securing the reliability of the breaking operation.

Here, the arc guide member is formed in a band shape having a width narrower than the length, and the arc moving width (arc moving sectional area) in the arc guide member is smaller than the arc moving width in the fixed base, have.

Wherein the arc guide member comprises: a joint portion fixed to one surface of the fixing table in a surface contact manner; A body bent obliquely at the joint and spaced apart from the fixing table; And a tip portion formed to be narrower toward the arc chamber in the body and discharge and disperse the arc between the plurality of grids.

According to an embodiment of the present invention, the side magnet may include a side magnet which is fixed to the fixed base to surround the fixed contact and transmits the arc to the arc induction member.

The side magnet is a magnetic body, and the arc can be guided to the arc guiding member by a magnetic force.

The side magnet may have a shielding structure that is opened toward the arc chamber and blocks both sides of the arc generated at the stationary contact.

The side magnet being opened toward the arc chamber and disposed parallel to both sides of the arc generated at the stationary contact; And a support plate which connects the other end of the side plate and is fixed to the other surface of the fixing table in a surface contact manner.

As described above, in the sub-unit for a circuit breaker of the present invention, the blocking performance is improved as the arc induction becomes faster. Further, the operation reliability of the circuit breaker is improved. In addition, by shortening the fault current interruption time, it is possible to prevent the burning of the load device due to the failure of the fault current interruption and to secure the safety of the operator.

1 is a schematic view showing an example of a conventional miniature wiring breaker according to the prior art.
2 is a schematic view showing an example of a wiring breaker according to the present invention.
3 is a front elevation view showing the arc induction path in the circuit breaker according to the present invention.
4 is a plan view taken along line IV-IV in FIG.
FIG. 5 is a part assembly view for arc induction according to the present invention. FIG.
Fig. 6 is a perspective view of the arc guiding member and the side magnet in Fig. 5;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains.

FIG. 2 is a schematic view showing an example of a wiring breaker according to the present invention, FIG. 3 is a front view showing the arc guide path in the wiring breaker according to the present invention, FIG. 4 is a plan view to be.

FIG. 5 is a perspective view of an arc induction member and a side magnet in FIG. 5. FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker for wiring, and more particularly to an arc induction part for rapidly inducing an arc.

The interrupter for wiring according to the present invention can quickly induce an arc generated between the stationary contact 10a and the movable contact 11a into the arc chamber 18 to quickly extinguish the arc and shorten the interruption time of the fault current.

The circuit breaker according to an embodiment of the present invention includes a case 1, a fixing table 10, a movable table 11, a handle 12, a bimetal 16, an instantaneous coil assembly 15, a latch 13, (14), a small unit (27), and the like.

The fixing table 10 and the movable table 11 connect the converter between the power source side terminal and the load side terminal. The energizing current flows to the power source side fixture 10, the movable stand 11, the instantaneous coil assembly 15, the bimetal 16, and the load side fixture (not numbered). Here, when the overcurrent flows through the fixed base 10, the movable base 11, and the instantaneous coil assembly 15, the bimetal 16 is bent by the overcurrent to rotate the trip bar 14. [ Then, as the trip bar 14 rotates, the latching state of the latch 13 is released and the handle 12 is released from the on position to the off position as the latching state of the latch 13 is released. And the movable base 11 is separated from the fixed base 10 by rotation.

When the instantaneous current (more than three times the rated current) flows through the fixed table 10, the movable table 11 and the instantaneous coil assembly 15, the instantaneous coil assembly 15 is rotated by the instantaneous current, Rotate the part once. Then, the trip bar 14 is rotated and the latch 13 is released from the restrained state and the handle 12 is rotated from the on position to the off position So that the movable base 11 is separated from the fixed base 10. At this time, the arc generated when the movable contact 11a of the movable base 11 is separated from the fixed contact 10a of the fixed base 10 is extinguished by the soffit unit 27. [

The term " fixed table 10 " refers to a power source side table 10 which is brought into contact with the movable contact 11a without any specific description in the following description.

The fixing table 10 has a fixed contact 10a on one side and the fixing table 10 is made of a conductive material.

The movable base 11 has a movable contact 11a at one end and the movable contact 11a can be separated or contact with the fixed contact 10a and is rotatably installed inside the case 1. [ One end of the movable base 11 rotates in the direction of the arc chamber 18 from the fixed base 10 when the movable contact 11a is separated from the fixed contact 10a.

The arc extinguishing unit 27 for the breaker of the present invention includes an arc chamber 18, an arc inducing member 28, a side magnet 29, and an arc runner 19. [

At this time, since the arc runner 19 has the same structure and function as those of the conventional arc runner 19, detailed description thereof will be omitted.

The arc chamber 18 is installed inside the case 1 and has a box structure having a receiving space therein.

The arc chamber 18 is made of an insulating material and has a plurality of grids 30 arranged at intervals therebetween. The grid 30 is supported by an arc chamber 18 made of a magnetic material. The arc introduced between the grids 30 is divided at the inlet side of the grid 30 by the driving magnetic field and moved to the outlet side along the grid 30 and then cooled at the end of the grid 30 and is extinguished.

The arc guide member 28 serves to guide the arc generated between the stationary contact 10a and the movable contact 11a to the arc chamber 18.

As for the structure of the arc guide member 28, the arc guide member 28 has a band-like structure whose width is relatively narrow as compared with the length. The welding portion 28a is provided at the other end of the arc guide member 28 so that the welding portion 28a of the arc guide member 28 is fixedly attached to one surface of the fixing table 10 adjacent to the stationary contact 10a. The body 28b of the arc guide member 28 is bent at an angle at a predetermined angle in the joint portion 28a of the arc guide member 28 and is spaced apart from the stationary table 10. The arc guide member 28 is provided at one end thereof with a tip portion 28c to guide the arc to the arc chamber 18. [ The tip portion 28c is bent in the direction of the arc chamber 18 from the body 28b of the arc inducing member 28 and formed to be narrower in the direction toward the arc chamber 18. [

The arc induction member 28 may be a magnetic substance and induce an arc generated at the stationary contact 10a to the arc portion 28a of the arc induction member 28 by a magnetic force, 28 of the arc guide member 28 to the tip 28c of the arc guide member 28 along the body 28b of the arc guide member 28 at the joint 28a of the arc guide member 28 and at the tip 28c of the arc guide member 28 The arc is discharged to the arc chamber 18.

The arc inducing member 28 is formed such that the joint portion 28a adhered to one surface of the fixing table 10 is located closer to the stationary contact 10a than the conventional arc runner 19 and the arc inducing member 28 The length of the body 28b of the fixed contact 10a is extended toward the arc chamber 18 and the width of the tip 28c of the arc guide member 28 is narrowed toward the arc chamber 18, The arc generated in the arc chamber 18 can be quickly guided to the arc chamber 18 as compared with the conventional arc runner 19. [

The side magnet 29 serves to rapidly induce an arc generated between the contacts as a magnetic body to the arc inducing member 28 by a magnetic force.

The side magnet 29 is installed on the fixed base 10 in a structure that surrounds the periphery of the fixed contact 10a where an arc is generated. The side magnet 29 according to the embodiment is composed of a side plate 29a and a support plate 29b connecting the side plate 29a to both sides of the fixed contact 10a.

At this time, the side magnets 29 are opened toward the arc chamber 18, and both sides of the stationary contact 10a are surrounded by the side plate 29a, and the arc is quickly moved by the magnetic induction member 28 . The movable contact 11a can be rotated in the direction away from the fixed contact 10a through the opening of the side magnet 29. [

The side plate 29a is inclined to increase in height from one end portion (opening side) to the other end portion (supporting plate side), and the amount of magnet increases from the upper end portion to the lower end portion of the side plate 29a, As shown in FIG.

The support plate 29b connects the other ends of the side plates 29a in the lateral direction and is fixed to the other surface of the fixing table 10 in a surface contact manner.

Hereinafter, a description will be given of the operation of the soffit unit 27 constructed as described above.

For example, when an abnormal current is generated, an arc is generated when the movable base 11 is opened from the fixed base 10. At this time, the side magnet 29 quickly induces the arc to the arc inducing member 28 by the magnetic force.

Of course, a part of the arc can directly move from the fixed contact 10a to the arc inducing member 28. [

The induced arc moves to the joint 28a, the body 28b and the tip 28c of the arc guide member 28. [ At this time, the arc moving sectional area (moving width) in the arc guiding member 28 is smaller (narrower) than the arc moving sectional area (width) in the side magnet 29 and the holding table 10, The arc moving density is increased at the boundary between the members 28, so that the arc moving speed is increased. The tip portion 28c is formed at one end of the arc guide member 28 so as to be narrowed toward the arc chamber 18 so as to be discharged and dispersed from the tip end portion 28c into the arc chamber 18. [ .

The arc discharged and dispersed into the arc chamber 18 is divided by the plurality of grids 30 and the divided arc is cooled and cut while moving to the end of the grid 30 and is completely extinguished at the zero point of the current, .

Therefore, according to the present invention, the arc generated between the contacts can be quickly guided to the arc guide member by the magnetic force of the side magnet 29, and the induced arc is guided to the arc chamber 18 through the arc guide member 28 So that the blocking performance can be improved and the blocking time can be shortened when an accident current is generated.

In addition, it is possible to reduce the scattering performance of the breaking operation and to secure the reliability of the breaking operation, thereby preventing burning of the load device and ensuring the safety of the operator.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Modified forms are also included within the scope of the present invention.

1: Case 10: Fixture
10a: fixed contact 11: movable base
11a: movable contact 12: handle
13: latch 14: trip bar
15: instantaneous coil assembly 16: bimetal
18: arc chamber 19: arc runner
27: Loop unit 28: Arc induction member
28a: connecting portion 28b: body
28c: leading edge 29: side magnet
29a: Side plate 29b: Support plate
30: Grid

Claims (8)

case;
A fixed base having a fixed contact and fixed to one side of the case;
A movable stand having a movable contact and rotatably installed on one side of the case; And
An SOHO unit for extinguishing an arc generated between the stationary contact and the movable contact;
Wherein the subscriber unit comprises:
An arc guiding member which extends toward the arc chamber at one end and is fixed to one surface of the stationary contact so as to be adjacent to the stationary contact to transfer an arc generated between the stationary contact and the movable contact to the arc chamber;
An arc chamber having a plurality of grids therein and dividing and cooling the arc transferred from the arc inducing member to extinguish the arc;
. The method according to claim 1,
Wherein the arc guiding member has a band shape whose width is relatively narrow as compared with the length, and the arc moving width (arc moving sectional area) in the arc guiding member is smaller than the arc moving width in the fixing table. The method according to claim 1,
The arc guiding member
A joining part fixed to one surface of the fixing table in a surface contact manner;
A body bent obliquely at the joint and spaced apart from the fixing table; And
A tip portion formed to be narrower in width from the body toward the arc chamber and discharging and dispersing an arc between the plurality of grids;
Of the circuit breaker. The method according to claim 1,
And a side magnet fixed to the fixed base to surround the fixed contact and transmitting the arc to the arc induction member. 5. The method according to any one of claims 1 to 4,
Wherein the side magnet is a magnetic body and induces an arc from the side magnet to the arc guide member by a magnetic force. 6. The method of claim 5,
Wherein the side magnet is open toward the arc chamber and has a shielding structure that blocks both sides of the arc generated at the stationary contact. 6. The method of claim 5,
Wherein the side magnet is opened toward the arc chamber,
A side plate disposed parallel to both sides of the arc generated at the stationary contact; And
A supporting plate connecting the other end of the side plate and fixed to the other surface of the fixing table in a surface contact manner;
Of the circuit breaker. 8. The method of claim 7,
Wherein the side plate is inclined so that the height increases from one end to the other end.

Images