Circuit breaker electrical contact support member and preparation method thereof

Abstract

The invention discloses a circuit breaker electrical contact support member and a preparation method thereof. The support member comprises a support member body made of a Cu/Fe/Cu material strip. One side of the support member body is provided with a built-in groove; the groove is embedded by a conductive insert block; and the insert block is provided with a contact point. The method is characterized by, carrying out thermal treatment on the Cu/Fe/Cu material strip, and rolling the Cu/Fe/Cu material strip obtained after thermal treatment; carrying out punching on the Cu/Fe/Cu material strip obtained after rolling to prepare the support member body; preparing the insert block, and inserting and welding the insert block to one side of the obtained support member body; and welding the contact point to the other side of the insert block. The support member is prepared by inserting the Cu block or other conductive metal blocks into the Cu/Fe/Cu composite strip, thereby improving the strength of the contact support member, ensuring stability of the current conduction when an electrical contact is contacted, and meanwhile, reducing copper material consumption and saving cost.

Description

technical field [0001] The invention relates to the technical field of electrical devices, in particular to a circuit breaker electrical contact support and a preparation method thereof. Background technique [0002] A circuit breaker is a switching device used in power distribution networks to distribute electric energy and protect lines and power supply equipment. It consists of two parts: an operating mechanism and an electrical contact system. The electrical contact system is divided into a moving contact system and a static contact system, which include contacts and supports respectively. The support serves as a mechanism for transmitting current and driving the contacts, and its performance directly affects the reliability of the circuit breaker. and stability. [0003] After searching, there are very few researches or reports on contact supports for circuit breakers at home and abroad. At present, the raw material of the contact support in the circuit breaker is usu...

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Problems solved by technology

[0005] In the prior art, the Cu / Fe / Cu material is used as a contact strip, which can reduce the cost, but if the material is directly used to prepare the electrical contact material, the contact interface of the contact is Cu or Cu / Fe / Cu when it is closed. , the conductivity of these two materials is lower than that of Ag, and Cu has poor mechanical strength at high temperature and is prone to deformation, resulting in unstable contact, while Fe metal is easy to be oxidized, and the structure and properties of Fe metal are different. It is anisotropic, and its surface contact resistivity is difficult to control. Therefore, Cu / Fe / Cu is not suitable as an electrical contact material directly; if Cu / Fe / Cu material is used as a contact support alone, when it contacts with silver-based contact material When the surface is Cu, the Cu layer of Cu / Fe / Cu will loosen or even break away from the Cu / Fe / Cu composite block during the continuous opening and closing process of the contact. In addition, when the contact surface with the silver-based contact material is Cu / In the case of Fe / Cu, Fe and Ag cannot obtain sufficient bonding strength through welding, cold compounding, etc., so failures such as Ag-based contact drop may occur during use

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