KR20030075042A - locking device for cireuit breaker - Google Patents

Abstract

PURPOSE: A lock device of a circuit breaker is provided to prevent previously an accident due to electric shock by interrupting an operation of the circuit breaker by means of a handle in a locking state. CONSTITUTION: A circuit breaker includes a case(1), a cover(2), a fixing contactor(3), a moving contactor(4), a switching unit portion, a detection unit portion(6), an arc extinguishing portion(7), a trip button, and a crossbar(16). A cam(24) and a base(25) are installed within the case(1). The cam(24) is rotated by the rotation of a key(21). The base(25) is linearly moved when the cam(24) is rotated by the rotation of the key(21). The base(25) is located at one side of the crossbar(16) in order to lock the crossbar by the movement of the base(25) when the key(21) is rotated to a locking state. A wing section(25a) is formed at the base(25) in order to be connected to the crossbar(16).

Description

Locking device for cireuit breaker

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly, to a circuit breaker configured to disable an operation of a circuit breaker by a handle in a state in which a user switches a key to a locked state by controlling the opening and closing states of an electric line. It relates to a lock device.

In general, the circuit breaker is installed on the electric line, and it is an electric device that prevents the occurrence of fire and protects human life as well as protecting the load by cutting off the circuit when an overload or short circuit occurs. .

In addition, the circuit breaker as described above has a structure in which the extinguishing device, the opening and closing mechanism, and the detector mechanism are integrated into the insulated enclosure, and the user manually operates the handle exposed to the outside of the enclosure to close the converter or open state. It can be controlled by

1 is a cross-sectional view showing a conventional circuit breaker, wherein the circuit breaker is an insulator and constitutes an enclosure and a case 1 and a cover 2, and a fixed contactor 3 and a movable contactor for receiving power from a converter and delivering it to a load side. (4), an opening / closing mechanism part 5 for enabling the closing and opening of the converter, a detector mechanism part 6 for detecting abnormal current in the converter, and an extinguishing mechanism part 7 for extinguishing the arc generated in a short circuit accident. And a trip button 8 or the like that allows the user to manually release the opening and closing mechanism.

In addition, the opening and closing mechanism is a handle 11 for the user to perform the ON (OFF) operation of the breaker, the link 12 and the latch 13 for supporting the open and closed state of the movable contact, and the handle And a latch holder 15 and a crossbar 16 for restraining or releasing the latch from the restrained state.

The operation state of the circuit breaker as described above is to maintain the open state of the converter in an on operation in which the converter is in the closed state, in an off operation in which the converter is in the open state, and in a state in which the latch is released and the on operation by the handle is impossible. There are four types of operation: trip operation and reset operation for turning the handle off from the trip state.

In the above on and off operation refers to the operation by the user to rotate the handle 11 in the closing direction or the opening direction, the movement of the handle is transmitted to the link 12 through the lever 14 to move the movable contactor (4) Is connected to the fixed contactor 3 or separated from the fixed contactor 3, and the latch 13 and the latch holder 15 are restrained by the crossbar 16.

When the user presses the trip button 8 in the above state or an accident current occurs, the crossbar 16 is rotated by the operation of the trip button 8 or the detector bulb 6, and the crossbar 16 causes the crossbar 16 to rotate. Since the latch holder 15, which has been restrained, is rotated and the latch 13 is released from the restrained state, the breaker is tripped. At this time, the operation of turning on the breaker by the handle 11 is impossible and the breaker is in the open state. Will be kept.

In order to operate the circuit breaker in an on or off state in the trip operation state as described above, the circuit breaker must be reset and then operated by a reset operation. At this time, when the handle 11 is moved to the reset position, the latch ( 13 is rotated by the lever 14 and the crossbar 16 is also rotated to the position before the trip operation to restrain the latch holder 15 so that the breaker is switched off.

Therefore, in order to switch the breaker in the trip state to the on state, the handle 11 in the trip position as described above must be moved to the reset position so that the breaker is turned off and then the handle must be operated again in the on state.

However, the conventional circuit breaker as described above has a problem that the user can turn on the breaker by simply moving the handle 11 to the reset position or the on position even after the user operates the breaker in the off state or the trip state for opening the converter. .

That is, even if a user (electric worker, etc.) operates the breaker in the off state or trip state for maintenance work or wiring work of the load device, or for the installation and inspection of the breaker, an arbitrary person operates the handle. Since the breaker can be turned on again, there is a concern that it may cause a safety accident such as an electric shock.

It is an object of the present invention to provide a lock of a circuit breaker which is configured such that any user who does not have a key cannot operate the handle of the breaker after the user operates the circuit breaker in the locked state by the key.

According to an embodiment of the present invention for achieving the above object, in the circuit breaker consisting of a case and a cover, a fixed contactor, a movable contactor, opening and closing mechanism, detector mechanism, arc extinguishing mechanism, trip button, crossbar, etc. A cam that rotates in conjunction with the rotation of the cam and a base that moves linearly according to the rotation of the cam are installed, and the base is located on one side of the crossbar to rotate the key in the locked state so that the base can move to restrain the crossbar. A lock of the circuit breaker is provided.

1 is a cross-sectional view showing a conventional circuit breaker

2 is a block diagram of a handle and an opening / closing mechanism of a conventional circuit breaker

3 is a cross-sectional view of a circuit breaker to which the apparatus of the present invention is applied.

4 is a perspective view of a circuit breaker to which the present invention is shown with the cover open;

5 is an exploded perspective view of the device of the present invention;

6 is a cross-sectional view showing a state in which the breaker is unlocked by the device of the present invention.

7 is a plan view of FIG.

8 is a cross-sectional view showing a state in which the breaker is locked by the device of the present invention;

9 is a top view of FIG. 8

Explanation of symbols for main parts of the drawings

16: crossbar 21: tall

24: Cam 25: Base

25a: wing

3 is a cross-sectional view of a circuit breaker to which the apparatus of the present invention is applied, and FIG. 4 is a perspective view of the circuit breaker shown with the cover open.

Case (1) and cover (2) constituting the enclosure, the fixed contactor (3), movable contactor (4), opening and closing mechanism (5), detector mechanism (6), extinguishing mechanism (7), trip button ( 8) The structure of the crossbar 16 and the like is the same as a general circuit breaker, and the apparatus of the present invention is provided on one side in the case.

5, the key 21 and the key bundle 22, the spacers 23 and 26 for assembling the key bundle in the breaker, and the key are fixed to the key bundle and interlock with the key. And a cam 24 that rotates, a base 25 that houses the cam, a screw 27 that fixes the spacer to the base, and an insulating washer 28 for insulating the screw.

The cam 24 is installed in the state of being connected to the inner wall surface of the base 25. When the cam 24 rotates by the operation of the key 21, the base 25 crossbars in accordance with the rotation direction of the cam 24. The linear movement is made in the direction of (16) or in the direction opposite to the crossbar 16.

In addition, the base piece 25 is integrally formed with a blade piece 25a, and the blade piece 25a is not connected to the cross bar 16 when the base 25 is moved in the opposite direction to the cross bar 16. However, when the base 25 moves in the crossbar 16 direction, the base 25 is formed at a position where the breaker can be tripped by hitting the crossbar 16.

According to the present invention as described above, in the normal use state of the breaker, as shown in FIGS. 6 and 7, the wing piece 25a of the base 25 is spaced apart from the crossbar 16 at a predetermined distance t.

In this state, when the user inserts the key 21 into the key body 22 and rotates it in the locked state, the cam 24 rotates clockwise in the drawing according to the rotation of the key 21 as shown in FIGS. 8 and 9. The base 25 is linearly moved in the crossbar 16 direction (right direction in the drawing) as the cam 24 rotates. When the base 25 moves, the wing piece 25a integrally formed with the base 25 is moved. ) Hits the crossbar 16 so that the crossbar 16 rotates counterclockwise on the drawing.

Accordingly, the breaker is tripped by the rotation of the crossbar 16. In this state, the breaker 25a of the base 25 restrains the crossbar 16 in the tripped state, so that the breaker is kept open.

On the other hand, in this state, the crossbar 16 is restrained in the trip state, and thus the operation of the handle 11 is impossible, so that it is impossible to switch the breaker to the reset state, the off state or the on state.

However, when the key 21 is inserted into the key body 22 in the locked state and the key 21 is rotated in the unlocked state, the cam 24 rotates counterclockwise as shown in FIGS. 7 and 8 by the rotation of the key 21. Since the base 25, which has been moved to the crossbar 16, moves to the opposite side of the crossbar 16 by the rotation of the cam 24, the restraint state of the crossbar 16 is released. It is possible to switch to the reset state, the off state or the on state.

As described above, the present invention adds a lock device that can control the breaker operation to the circuit breaker, and when the lock device is in the unlocked state, the breaker can be operated by a handle like a conventional breaker. It is configured so that the breaker cannot be operated by the handle when in the locked state.

Therefore, after the user locks the breaker for maintenance of the load equipment connected to the breaker, wiring work, or installation and inspection of the breaker, any person manipulates the breaker handle unless the breaker is restored to the unlocked state by the key. Since the circuit breaker cannot be turned on again, safe work is possible and safety accidents such as electric shocks can be prevented in advance.

Claims (2)

In the circuit breaker consisting of a case and a cover, a fixed contactor, a movable contactor, an opening / closing mechanism, a detector mechanism, an arc extinguishing mechanism, a trip button, a crossbar, etc., In the case, a cam that rotates in conjunction with the rotation of the key and a base that moves linearly in accordance with the rotation of the cam is installed, and the base is positioned on one side of the crossbar to rotate the key in the locked state, thereby moving the base to restrain the crossbar. The lock device of the circuit breaker characterized by the above-mentioned. The method of claim 1, The lock device of the circuit breaker formed integrally with the wing piece in the base so that the wing piece is connected to the crossbar during the movement of the base.