Fast closing mechanism of small circuit breaker

Abstract

The invention relates to a fast closing mechanism of a small-sized breaker, which mainly adopts a structure that a handle and a connecting link are connected, and the upper end of a moving contact is integrated into one body with a lever through the riveting function of a shaft pin; the middle part of the lever is articulated with a main shaft; the moving contact and the lever is closely connected through a contact pressure spring; a locking spring is provided on a boss of the locking component sharing the same circle center with the main shaft; a fast closing functional component is arranged on the chassis of the shell outside the breaker; the mechanism of the invention is characterized in that: the moving contact is connected with the fast closing functional component through locking. The fast closing functional component is provided with a boss, an elastic thin wall, a side wall and a through hole. The lower end of the lever is provided with a boss, and the boss is connected with a budge through locking. The mechanism of the invention has simple, compact and reasonable structure; when the contacts are to be closed, the fast closing can be realized through mechanical energy storage, causing the operation consuming manpower originally to be changed into the operation without manpower consumption; meanwhile, the mechanism of the invention has reliable performance, easy realization, easy assembly, low cost, relatively low rotational inertia of the moving contact, faster closing and disconnecting velocity as well as improved breaking capacity.

Description

technical field [0001] The invention relates to a quick closing mechanism of a small circuit breaker. Specifically, after the quick closing mechanism is installed on the small circuit breaker, when the contacts are about to close, the contacts can be quickly closed by means of mechanical energy storage. Background technique [0002] In the prior art, the quick-closing mechanism in the miniature circuit breaker is driven by the handle. For example, the quick-closing mechanism described in the patent 97248479.5, a high-breaking miniature circuit breaker, is equipped with a rocker arm on the shaft of the handle. During the rotation of the arm around its axis, friction occurs with the arc surface of the contact support, so that the moving contact and the contact support supporting it are suspended at a certain position. As the handle continues to rotate, the rocker arm is driven Continue to rotate, when a certain limit position is crossed, the arc surface of the rocker arm cross...

AI Technical Summary

Problems solved by technology

This quick closing mechanism is driven by the handle. Since the handle is far away from the moving contact, an indirect part must be used to lengthen the moving contact; this indirect part must be processed with special engineering plastics with high strength and excellent heat resistance This will inevitably increase the cost and increase the difficulty of realization; at the same time, the moving contact assembly composed of the moving contact and this indirect part also increases the moment of inertia, reduces the breaking speed of the moving contact, and limits the breaking capacity ; And the friction force is used as the braking force, which makes the structure poor in consistency and reduces the reliability

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