Breaker card board bounce-resistant mechanism

Abstract

The invention discloses a breaker card board bounce-resistant mechanism. The breaker card board bounce-resistant mechanism comprises a circuit breaker body, and a mechanism main shaft and a breaking stop shaft disposed on the circuit breaker body, the circuit breaker body is further provided with a cantilever, a card board, a card board rotating shaft and a tension spring, a first mounting portionof the cantilever is fixedly mounted on the mechanism main shaft, the card board rotating shaft is fixedly mounted on a second mounting portion of the cantilever, the rear end of the card board is rotatably mounted on the card board rotating shaft, a limiting shaft is fixedly arranged at the front end of the card board, the limiting shaft is arranged in a limiting hole, the two ends of the tension spring are respectively acted on the cantilever and the card board, and the breaking stop shaft performs limiting of the limit rotation position of the limit portion of the cantilever. The breaker card board bounce-resistant mechanism is simple in structure, few in the number of added parts and small in occupation space, the opening moving contact is not random any long or is not influenced by amoving contact spring, and is in a constant small range to improve the breaking and short-time withstand performances of the circuit breaker.

Description

technical field [0001] The invention belongs to the technical field of low-voltage circuit breakers, and in particular relates to a clamp-type anti-bounce mechanism for a breaker. Background technique [0002] In electrical appliances, circuit breakers are used to distribute electric energy and protect lines and equipment from overload, short circuit and other faults. With the intelligent development of the power grid, the capacity of the power grid is constantly expanding, and the performance requirements of the power system for circuit protection switches are also increasing. come higher. For power distribution appliances, the breaking capacity of circuit breakers has always been an important test index for practical applications. In order to speed up the breaking speed of the product and achieve the purpose of improving the breaking index, the current common practice in the market is to increase the spring force of the mechanism and the spring force of the contact. The i...

AI Technical Summary

Problems solved by technology

In order to speed up the breaking speed of the product and achieve the purpose of improving the breaking index, the current common practice in the market is to increase the spring force of the mechanism and the spring force of the contact. The increase of these two forces makes the breaking speed of the circuit breaker faster, but this method There are disadvantages. Due to the increase of the spring force of the mechanism and the spring force of the contact, the increase of the spring force of the moving contact will cause the rebound of the moving contact to increase after the opening of the moving contact is in place, which will lead to a sharp decrease in the effective opening distance. In this way, it is easy to cause re-ignition, but it reduces the breaking index.

Images