Circuit breaker mechanism with locking device for preventing tripping bounce of moving contact

Abstract

The invention provides a circuit breaker mechanism with a locking device for preventing the tripping bounce of a moving contact. The circuit breaker mechanism comprises a moving contact push rod and alocking device. The moving contact is provided with a moving contact intermediate shaft. The locking device comprises a lock catch movable plate, a lock catch pin and a tension spring; the lock catchmovable plate is rotatably arranged on the lock catch pin; an L-shaped sliding groove is formed in the lock catch movable plate, the lock catch movable plate on one side of the L-shaped sliding groove is connected with one end of the tension spring, the L-shaped sliding groove comprises a vertical sliding groove body and a horizontal sliding groove body, the moving contact intermediate shaft is limited in the L-shaped sliding groove in a sliding mode, and the tension spring exerts downward tension on the lock catch movable plate on one side of the L-shaped sliding groove; when the moving contact and the static contact are switched on, the end part of the moving contact intermediate shaft slides to the right end of the horizontal chute; when the moving contact and the static contact are switched off, the end part of the moving contact intermediate shaft slides from the right end to the left end of the horizontal chute, and the tension of the tension spring enables the end part of the moving contact intermediate shaft to slide upwards into the vertical sliding groove body.

Description

technical field [0001] The invention mainly relates to the technical field related to circuit breaker switches, in particular to a circuit breaker mechanism with a locking device for preventing the opening and bouncing of a moving contact. Background technique [0002] When the power distribution system encounters a short-circuit current, the circuit breaker needs to be able to act instantaneously to cut off the current to ensure the safety of the entire system equipment, which requires the circuit breaker to have the ability to act instantaneously. In the prior art, the circuit breaker generally uses an instantaneous release to realize rapid breaking of the circuit breaker, thereby greatly shortening the time for instantaneous tripping of the circuit breaker. Once the loop current exceeds the set value of the system, the instantaneous release will trip immediately without delay, and the faster the current rises, the faster the response and the shorter the action time. The ...

AI Technical Summary

Problems solved by technology

[0003] However, when the circuit breaker is disconnected quickly, a huge repulsive force is formed between the moving contact and the static contact, which will cause the moving contact to collide violently with the opening limit block at the opening position of the circuit breaker, resulting in a One or even multiple bounces of the contact

The bouncing of the moving contact will cause the disconnected arc to re-ignite, and multiple re-ignitions will occur after repeated bouncing. Finally, when the circuit breaker encounters a large short-circuit current, it cannot achieve successful opening.

[0004] In the prior art, an opening buffer is provided at the opening position of the moving contact to solve the above problems, but considering the overall compactness of the circuit breaker, the volume of the opening buffer should not be too large, otherwise the overall stroke of the buffer will Restricted, so that there is a rigid collision between the moving contact and the outer shell of the buffer, it is difficult to play a buffering effect. When the system encounters a short circuit and a large current, the circuit breaker cannot be reliably broken

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