KR101419008B1

KR101419008B1 - Molded case circuit breaker

Info

Publication number: KR101419008B1
Application number: KR1020100118060A
Authority: KR
Inventors: 윤대영; 김덕중; 김재모
Original assignee: 현대중공업 주식회사
Priority date: 2010-11-25
Filing date: 2010-11-25
Publication date: 2014-07-16
Also published as: KR20120056487A

Abstract

A wiring breaker of the present invention comprises a stationary contactor, a movable contact which is kept in contact with the stationary contactor and separated by rotation while an arc is generated when a short-circuit current is applied, and a reset for operating the trip device to trip the movable contactor And a case in which an arc exhaust port for discharging an arc is formed. The circuit breaker includes a first crossbar extending laterally to the rear of the case and a second crossbar extending in the front of the case away from the first crossbar. A second crossbar connected to the movable contact and installed to move up and down along a radius of rotation within a predetermined range; And
And an elastic member connected to the first crossbar and the second crossbar at both ends thereof to maintain a contact pressure of the movable contact connected to the second crossbar by applying a tensile force.

Description

{MOLDED CASE CIRCUIT BREAKER}

The present invention relates to a wiring breaker, and more particularly, by applying a deformation preventing structure of a cross bar that maintains contact pressure of a movable contact point, contact pressure of the N-phase movable contact point is not reduced, To a wiring breaker.

In general, a wiring breaker is an electric device used for automatically shutting off a circuit or opening and closing a load by using a detecting device in the event of an overload condition or a short circuit in a power system line of a transmission / distribution system or a connection system line to an electric device.

1, the conventional circuit breaker 1 has various structures, which are different in size, number of poles, operation method, and the like. However, the case 10, the contactor, the trip device 20, (30), an opening / closing mechanism, a soot unit (40), a terminal, and the like.

As shown in FIG. 2, the SO portion 40 includes a contact portion and a SOHO grid portion. The contact portion includes a stationary contact point and a movable contact point. And a crossbar for maintaining the contact pressure of the movable contact is inserted through the side of the case.

That is, when the circuit is in a normal state, the stationary contact point and the movable contact point are in contact with each other. On the other hand, when a short circuit current occurs due to a failure of the circuit, the movable contact is separated from the fixed contact by the driving unit, and an arc is generated between the two contacts.

However, in the conventional wiring breaker, there is a problem that the contact pressure of the N-phase movable contact point decreases and the temperature rises as the position of the cross bar for maintaining the contact pressure of the N-phase movable contact point is changed.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method for reducing the contact pressure of an N-phase movable contactor by applying an elastic member that applies a tensile force to a crossbar, And to provide a wiring breaker capable of preventing a rise in the temperature of the apparatus and ensuring operation reliability and safety of the apparatus.

According to another aspect of the present invention, there is provided a movable contactor comprising: a stationary contactor; a movable contactor which is kept in contact with the stationary contactor and is separated by rotation while an arc is generated when a short circuit current is applied; And a case in which an arc exhaust port for discharging an arc is formed, the circuit breaker comprising: a first crossbar provided laterally to the rear of the case; and a second crossbar disposed forwardly of the case away from the first crossbar A second crossbar connected to the movable contact and installed so as to be able to reciprocate up and down along a radius of rotation within a predetermined range and both ends connected to the first crossbar and the second crossbar, And the second crossbar is connected to the movable contactor, It characterized in that it comprises a member.

Preferably, a long hole having a round shape is formed through the side of the case to guide the second crossbar while providing a turning radius of the second crossbar.

The case is arranged so as to be divided into an R phase, an S phase, a T phase, and an N phase body, and the elastic member has a first crossbar passing between the T phase and the N phase, Are preferably connected to each other, and are positioned between the T phase and the N phase.

Preferably, the elastic member is a coil spring having both ends connected to the first crossbar and the second crossbar, respectively.

As described above, according to the present invention, by employing the deformation preventing structure for the cross bar which maintains the contact pressure of the movable contact point, it is possible to prevent the temperature rise due to the reduction of the contact pressure of the movable contact point and to secure the operation reliability and safety of the mechanism There is an advantage to be able to do. Further, there is an advantage that the number of parts required to maintain the contact load of the N-phase movable contact point can be reduced to one.

1 is a perspective view showing a conventional wiring breaker.
2 is a perspective view showing a trip device structure of a conventional wiring breaker.
3 is a perspective view showing a circuit breaker according to the present invention.
4 is a perspective view showing an elastic member of the circuit breaker according to the present invention.
FIGS. 5A and 5B are operational states for illustrating operation states of the second crossbar and the elastic member of the circuit breaker according to the present invention.
6A and 6B are operational states showing the operating states of the fixed contacts and the movable contacts of the circuit breaker according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the present invention, the defined terms are defined in consideration of the function of the present invention, and should not be understood in a limiting sense of the technical elements of the present invention.

As shown in Figs. 3 to 6B, the circuit breaker of the present invention prevents deformation of the cross bar that maintains the contact pressure of the movable contact, which is rotatably installed on the N phase, thereby improving reliability and safety of the operation of the mechanism will be.

The circuit breaker of the present invention is provided with a case 100 in the form of a hollow body that forms a space portion inside the case 100. The case 100 includes a stationary contactor 200 and a stationary contactor 200, A reset lever 400 for operating a trip device (not shown) for tripping the movable contactor 300, and a reset lever 400 for actuating a trip device (not shown) for tripping the movable contactor 300, And an arc discharge port (not shown) for discharging the arc are formed.

The first crossbar 400 is laterally pierced in the rear of the case 100. The first crossbar 400 is laterally pierced in front of the case 100 that is spaced apart from the first crossbar 400, A second crossbar 500 connected to the first crossbar 400 and the second crossbar 500 such that the first crossbar 400 and the second crossbar 500 are connected to each other, And an elastic member 600 for keeping the contact pressure of the movable contact 300 connected to the second crossbar 500 constant.

Here, on the side of the case 100, a long hole 110 having a round shape is formed laterally to guide the second crossbar 500 while providing a turning radius of the second crossbar 500.

The long hole 110 preferably provides the same turning radius so that the movable contact can be easily rotated, but the length is not limited and can be selectively formed.

The case 100 may be divided into R, S, T, and N phases, respectively. The R, S, T, and N phases may be arranged such that their sides are adjacent to each other have.

That is, the stationary contactor 200, the movable contactor 300, the trip device, and the arc exhaust port (not shown) may be provided on the R phase, the S phase, the T phase, and the N phase body, respectively. In order to trip the movable contactor 300, a reset lever 700 for operating the trip device may be installed in the S phase body.

The stationary contactor 200 is fixedly installed in the space portion of the case 100 and can be disposed so as to be divided into two ends in a slanting line. And fixed contact portions 210 are provided at the opposite upper and lower ends of the divided ends, respectively.

The stationary contactor 200 is rotatably shaft-connected in the space of the case 100 and is provided with movable contact portions 310 at upper and lower end portions opposite to both ends thereof to be rotated. That is, by the rotation of the stationary contactor 200, the movable contact portion 310 can be separated and contacted to the fixed contact portion 210, respectively.

In addition, the first crossbar 400 and the second crossbar 500 may be installed to pass through the sides of the R-phase, S-phase, T-phase, and N-phase bodies. Further, the above-described long holes 110 may be formed in all of the R-phase, S-phase, T-phase, and N-phase bodies.

Here, the above-described elastic member 600 has both ends connected to the first crossbar 400 and the second crossbar 500 passing through between the T-phase and the N-phase. Thereby, the elastic member 600 can be positioned between the T-phase and the N-phase.

The elastic member 600 is preferably a coil spring having both ends connected to the first crossbar 400 and the second crossbar 500 to exert a tensile force.

That is, the tensile force of the coil spring is transmitted to the second crossbar 500, and the contact pressure of the movable contact installed on the N phase can be kept constant by the tensile force transmitted to the second crossbar 500.

As shown in Figs. 5A to 6B, in the case of the breaker for wiring according to the present invention, when the movable contact is tripped, the second crossbar 500 is rotated in one direction by the movable contact 300 to be rotated. On the other hand, the second crossbar 500 can be returned to the original position by the movable contact member 300 rotated in the reverse direction.

At this time, the elastic member 600 having both ends connected to the first crossbar 400 and the second crossbar 500 applies a tensile force to the second crossbar 500, so that the contact pressure of the movable contact member 300 is constant Can be maintained.

As a result, the present invention prevents the temperature rise due to the decrease of the contact pressure of the N-phase movable contact point 300 by applying the deformation preventing structure to the cross bar that maintains the contact pressure of the N-phase movable contact point 300 So that the reliability and safety of the mechanism can be ensured. Further, the number of parts required to maintain the contact load of the N-phase movable contact member 300 can be reduced to one.

Although the technical idea of the circuit breaker according to the present invention has been described above with reference to the accompanying drawings, it is to be understood that the best mode for carrying out the invention is illustrative and not restrictive.

Accordingly, it is a matter of course that various modifications and variations of the present invention are possible without departing from the scope of the present invention. And are included in the technical scope of the present invention.

100: Case 110: Long hole
200: stationary contactor 210: stationary contact portion
300: movable contact member 310: movable contact member
400: first crossbar 500: second crossbar
600: elastic member

700: Reset lever

Claims

A movable contact which is kept in contact with the stationary contactor and separated by rotation while an arc is generated when a short-circuit current is applied; a reset lever for operating the trip device to trip the movable contact; And a case in which an arc exhaust port for discharging an arc is formed,
A first crossbar extending laterally through the rear of the case;
A second crossbar extending laterally in front of the case spaced apart from the first crossbar and connected to the movable contact so as to be vertically reciprocable along a radius of rotation within a predetermined range; And
And an elastic member connected to the first crossbar and the second crossbar at both ends thereof to maintain a contact pressure of the movable contact connected to the second crossbar by applying a tensile force.

The method according to claim 1,
And a long hole having a rounded shape is formed laterally at the side of the case so as to guide the second crossbar while providing a turning radius of the second crossbar.

The method according to claim 1,
The case is arranged in an R-phase, S-phase, T-phase, and N-phase body,
Wherein the elastic member is connected to both the first crossbar and the second crossbar passing between the T phase and the N phase, and is positioned between the T phase and the N phase.

3. The method according to claim 1 or 2,
Wherein the elastic member is a coil spring having both ends connected to the first crossbar and the second crossbar, respectively.