Moving contact device of moulded case circuit breaker

Abstract

The invention relates to a moving contact device of a moulded case circuit breaker. The moving contact device is assembled by a moving contact, a support, a fixing pin, a disk spring, a compressing sleeve, a split washer, a hinge pin, a shaft sleeve, a tension spring and a rotation shaft, thus the simplest parts can be utilized to realize the dropproof device of the moving contact of the circuit breaker. When a line is broken, the electro-dynamic repulsion force generated by the short-circuit current is utilized to lift up the moving contact and keep a break distance, thus limiting the current and increasing the breaking capacity of the circuit breaker. In the moving contact device of the moulded case circuit breaker, the connection mode of the moving contact and the lead-out end is that the copper support is used to clamp the both sides of the moving contact, the flexible connection material is not required and the welding technology is not adopted; and the moving contact device has reliable structure and low cost and can achieve the aims of simple process, convenient installation, economy and practicability.

Description

technical field [0001] The invention belongs to the industry of power transmission and distribution equipment, and relates to a moving contact device of a low-voltage molded case circuit breaker in switchgear components. Background technique [0002] In the prior art, there are two main technical indicators for the moving contact system of the low-voltage molded case circuit breaker: providing contact final pressure and conducting electricity reliably. However, with the advancement of circuit breaker design technology, while meeting these two technical indicators, a new design concept of using technologies such as moving contact anti-drop devices to limit the circuit current has emerged. At present, most circuit breakers do not have anti-drop devices or have more complex anti-drop devices, and the rear outlets of the moving contacts are connected by welding soft connections. These two traditional methods are the current circuit breaker moving contacts The most widely used t...

AI Technical Summary

Problems solved by technology

At present, most circuit breakers do not have anti-drop devices or have more complicated anti-drop devices, and the rear outlets of the moving contacts are connected by welding soft connections. These two traditional methods are the current circuit breaker moving contacts The most widely used technology, but at the same time have their limitations and defects

At present, some anti-drop devices have many types of parts, complicated process, inconvenient installation, low product stability, and cannot reliably fix the moving contact at the open position, and the production cost is also high; the moving contact outlet adopts welding The method of soft connection is complex in process, inconvenient for inspection, and increases the cost. Moreover, the welded soft connection is easy to wear during the use of the circuit breaker, causing the temperature rise of the circuit breaker to exceed the standard, which is one of the bottlenecks in the current circuit breaker manufacturing process. place

For example, the patent application number is 200810071883.x, the processing technology of the parts is complicated, and the surface finish needs to be controlled after the forming process; the positioning of the pressure plate is not easy to achieve accuracy, and it is easy to cause left and right shaking under the force of the compression spring to cause failure, and The overall installation is inconvenient, and the compression spring needs to be assembled with special tooling when it is installed inside the shaft; the contact position between the pressure plate and the spring is not stable, and the force is uneven, which may easily cause uneven contact pressure and affect the stability of the mechanism

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