Magnetic release and circuit breaker having same

Abstract

The invention relates to a magnetic release and a circuit breaker with the same. The magnetic release comprises an armature and an elastic reset piece for driving the armature to reset, and further comprises a first permanent magnet located in the middle, and a second permanent magnet and a third permanent magnet which are located at the two sides of the first permanent magnet at equal intervals, wherein the two sides of the first permanent magnet as well as the second permanent magnet and the third permanent magnet on the two sides of the first permanent magnet are different in polarity, the first permanent magnet serves as a first magnetic attraction end, the second permanent magnet and the third permanent magnet form a second magnetic attraction end, any one of the first magnetic attraction end and the second magnetic attraction end follows the deformation stroke of the elastic reset piece, and the opposite other one is fixedly arranged, so that in the deformation stroke of the elastic reset piece, the reset force of the elastic reset piece is superposed and intervened by virtue of the mutual magnetic force action of the first magnetic attraction end and the second magnetic attraction end, the armature is helped to overcome the elastic restoring force of the elastic reset piece during movement, and after the unlocking motion of the armature is finished, the elastic restoring force is maximized to ensure the resetting of the armature.

Description

technical field [0001] The invention relates to the technical field of circuit breaker manufacture, in particular to the improvement of a magnetic release. Background technique [0002] The magnetic release is one of the components that make up the molded case circuit breaker. It is composed of a conductor, an armature, a yoke, a support, a push rod, and a reaction spring. The conductor passes through the yoke. When the conductor passes a certain current, due to the phenomenon of electromagnetic induction, magnetic flux is generated in the armature, the yoke and the air gap between them. suction. As the yoke is fixed, the armature moves toward the yoke under the action of electromagnetic attraction, and the push rod fixedly connected with the armature impacts and drags the lock mechanism of the circuit breaker to unlock it, and the circuit breaker then completes the tripping and breaking functions. Cut off the fault current to protect the safety of lines and equipment. ...

AI Technical Summary

Problems solved by technology

However, there is a disadvantage in such a structure, that is, when the armature moves toward the yoke, it needs to overcome the elastic restoring force of the reaction force spring. Under a small current, the electromagnetic attraction force is small, and the armature cannot overcome the elastic restoration force of the reaction force spring. , it is impossible to unlock the locking mechanism to complete the breaking function

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