A high-voltage circuit breaker with integrated buffer and counterweight

Abstract

The invention relates to a high-voltage circuit breaker with a buffer and a balance weight integrated. The high-voltage circuit breaker comprises a shell, a main circuit arranged in the shell, an arc extinguishing mechanism and an operating mechanism; a main shaft of the operating mechanism drives a moving contact of the main circuit to conduct reciprocating motion through a transmission assembly so that switching on and switching off of a brake can be achieved; the transmission assembly comprises a main transmission crank arm connected with the main shaft; the main shaft is further connected with the buffer through a crank arm; the buffer comprises a buffering cylinder and a piston rod capable of conducting rectilinear motion relative to the buffering cylinder; the piston rod is arranged on the upper portion of the buffering cylinder, the crank arm is connected with the lower end of the buffering cylinder; a balance weight end cap is arranged on the end portion of the upper end of the buffering cylinder; the portion between the balance weight end cap and the buffering cylinder is sleeved with a reset spring; a strip-shaped hole is formed in the balance weight end cap; a limiting pin is inserted in the strip-shaped hole; the limiting pin is fixed on a supporting board; the strip-shaped hole can slide relative to the limiting pin and conduct limiting. According to the high-voltage circuit breaker, the buffer and the balance weight are arranged integrally, the structure is simple and multiple functions of buffering, limiting and weighting can be achieved.

Description

technical field [0001] The invention relates to a high voltage circuit breaker. Background technique [0002] At present, in the high-voltage circuit breaker products, since the powerful energy needs to be absorbed in a short time when opening, the opening buffer is used without exception to achieve the effect of rapidly absorbing energy. When the brake is opened, all the moving parts participate in the opening process under the drive of the contact spring and the opening spring. After the contact spring completes the overtravel compression energy and releases, the moving contact moves together with the transmission mechanism, and finally is driven by the rotating shaft on the main shaft. The buffer is connected to the crank arm to contact and compress the buffer, the moving contact and the transmission mechanism decelerate, the buffer compresses the buffer spring to the bottom, and the moving parts of the circuit breaker are limited. In addition, for high-voltage circuit b...

AI Technical Summary

Problems solved by technology

[0004] 1. The buffer adopts an inverted fixing method, that is, the piston rod faces downward. Due to its own gravity and other factors, the buffer is not in the best state of buffering and absorbing energy when the circuit breaker is opened; in addition, due to the inverted fixing, the current large The oil in the oil buffer used in most circuit breaker products has the risk of seeping out, affecting the performance of the opening buffer

[0005] 2. The design of the counterweight is usually added to the main drive arm of the circuit breaker. The main drive arm is connected to the moving contact through the transmission component. On the one hand, it will affect the assembly efficiency of the relevant parts on the main drive arm. On the other hand Since the equivalent mass on the crank arm of the main drive is small, the total mass of the counterweight that needs to be added is relatively large, and the corresponding cost is also relatively high

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