Circuit breaker single-coil permanent magnet operating mechanism

Abstract

The invention discloses a circuit breaker single-coil permanent magnet operating mechanism, which comprises a driving mechanism and a transmission mechanism. The driving mechanism comprises a housing,a lower bottom plate, a fixing frame, a movable shaft, a permanent magnet and a static iron core. The housing is fixed on the lower bottom plate; the movable shaft penetrates through the housing; thepermanent magnet is fixed on the movable shaft; the fixing frame is arranged on the lower bottom plate; the static iron core is fixed on the fixing frame; a coil used for being connected with an external control circuit is wound on the static iron core; the movable shaft penetrates through the center of the static iron core; and the permanent magnet, the coil, the static iron core and the coil are sequentially arranged outwards with the movable shaft as the center. The transmission mechanism comprises a buffer device and a lever, wherein the long end of the lever is connected with the bottomof the movable shaft through the buffer device, and the short end of the lever is used for being connected with an arc extinguishing chamber. The provided circuit breaker single-coil permanent magnetoperating mechanism is low in energy consumption, long in service life, small in impact, and safe and reliable.

Description

technical field [0001] The invention relates to a circuit breaker single-coil permanent magnet operating mechanism, which belongs to the technical field of circuit breakers. Background technique [0002] At present, a stable and good power control system can more effectively promote the rapid development of the social electronic information age. To ensure the smooth operation of power distribution lines and electrical equipment, circuit breakers with good performance must be equipped. As the weakest link in the circuit breaker components, the operating mechanism accounts for about 80% of the total failure rate of the circuit breaker during its operation. [0003] Among the operating mechanisms, the permanent magnet operating mechanism is currently the most commonly used, and it can be divided into three types: single-coil monostable, double-coil monostable and double-coil bistable. However, the ordinary single-coil monostable structure can only pass current into one coil, a...

AI Technical Summary

Problems solved by technology

However, the ordinary single-coil monostable structure can only pass current into one coil, and a reverse magnetic field will be generated when the reverse current is passed in. The permanent magnet will be demagnetized if it is in the reverse magnetic field for a long time, which will affect the service life; at the same time, it will open and close Large current required, high energy consumption

Ordinary double-coil structure accelerates when opening and closing, and the contacts are prone to violent collisions

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