Circuit breaker contact mechanism with quick switching-on function

Abstract

The invention discloses a circuit breaker contact mechanism with a quick switching-on function, which comprises a moving contact, a mechanism bracket, a mechanism main shaft, a pivot, a contact spring, a quick switching-on locking fastener and a quick switching-on tripping fastener. When a handle drives the mechanism bracket and the moving contact to be switched on from an opening position to a stagnation position, the moving contact is blocked by the stop arm of the quick switching-on locking fastener and the first lock catch arm and the second lock catch arm are buckled to prevent the quick switching-on locking fastener from rotating around the mechanism main shaft, so that the moving contact stops switching on; the handle continues to act in the closing direction, rotation of the handle drives the mechanism support to continue closing, and the contact spring begins to store energy; and the moving contact is quickly switched on under the action of the contact spring until the part synchronously acting with the handle abuts against the tripping arm of the quick switching-on tripping fastener to enable the second locking arm to be tripped from the first locking arm. The contact mechanism is long in service life, small in occupied space, simple in structure and high in reliability.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to a circuit breaker contact mechanism with fast closing function. Background technique [0002] As we all know, when a miniature circuit breaker is closed or opened with load, an arc will be generated between the contacts, and this arc will ablate the moving and static contacts of the circuit breaker. The electrical life effect is very obvious. Compared with opening, the arc suppression between the contacts of the miniature circuit breaker is more important when closing, because the opening speed of the contact of the circuit breaker is driven by the spring of the mechanism, and the speed is generally fast and stable, while the closing speed of the circuit breaker It is affected by manpower or operating the motor, generally the speed is slow, the arc burns for a long time, and the damage to the contacts is large, especially for small circuit breakers with large rated currents. [...

AI Technical Summary

Problems solved by technology

[0005] An instant closing structure and switching device (201720492534.X) and a fast closing structure of a small circuit breaker (201620120982.X) provided by the existing patents, their fast switching mechanism is especially a fast switching energy storage structure (energy storage spring ) of the quick-release mechanism located at the handle. The driving force for quick closing is provided by the energy storage spring at the handle. When closing quickly, it needs to overcome the rotation resistance of the entire contact mechanism or the sliding friction resistance of the mechanism components, and quickly close. The brake resistance is large, and at the same time the mass of the entire contact mechanism is large, the inertia is also large, and the acceleration of fast closing is small, so the speed of fast closing cannot be compared with this scheme. The U-shaped connecting rod of the mechanism, the mechanism bracket and other parts have a large impact, which is easy to deform these parts and cause the performance of the circuit breaker to drift

[0006] The typical structure of an intelligent circuit breaker is that an intelligent control module is installed on one side of the circuit breaker. The motor gear system of the intelligent control module drives each of Therefore, the handle axis of this intelligent circuit breaker is provided with a rectangular or other non-circular through hole to accommodate the transmission shaft. The existing quick-release switch with the energy storage structure arranged on the handle mechanism, its energy storage mechanism takes up most of the handle space, making the strength of the handle parts greatly weakened, easy to deform or break, and the transmission hole in the handle becomes smaller, which weakens the stability and transmission efficiency of the inner shaft transmission, and easily causes the inner shaft to Hole cracking, deformation, and unstable transmission ratio affect the action performance of the intelligent circuit breaker

[0007] The existing quick-throwing mechanism with the energy storage structure (energy storage spring) arranged at the handle and other existing quick-throwing mechanisms combine the quick-throwing function with the circuit breaker contact mechanism function. Once the quick-throwing mechanism fails, Affects the basic protection function of the circuit breaker

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