Switch contact structure

Abstract

The invention discloses a switch contact structure for a closing switch. The switch contact structure comprises a pair of movable contact pieces and a static contact which can be positioned between the movable contact pieces, wherein the left and right sides of the static contact are provided with a pair of auxiliary contact points made of a copper-chromium alloy material; the inner sides of the two movable contact pieces are provided with main contact points which are formed oppositely; and auxiliary contact pieces which are made of the copper-chromium alloy material and are matched with the auxiliary contact points are arranged at the upper ends of the main contact points. After the structure is adopted, during switching on, the auxiliary contact points are contacted with the static contacts prior to the main contact points, so that burning of the contacts caused by electric arc can be avoided, the advantages of ablation resistance of the auxiliary contact points and the auxiliary contact pieces made of the copper-chromium alloy with high melting point are fully utilized, the copper static contacts and movable contact pieces with high conducting performance but lower melting points are indirectly protected from being burnt, the aims of increasing the switching-on / off times and improving the switching-on / off capability are fulfilled effectively, and the service life of an entire switch is prolonged.

Description

[0001] technical field [0002] The invention relates to a switch contact structure for a knife switch. Background technique [0003] The knife switch is one of the commonly used switches in opening and closing. It is mainly composed of two parts: a static contact and a moving contact. The two contacts of the existing knife switch often generate electric sparks at the moment of contact. The resulting high temperature will burn out the contacts, thereby affecting the service life of the entire switch. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a switch contact structure that can improve the service life of the switch. [0005] In order to solve the above-mentioned technical problems, the switch contact structure of the present invention includes a pair of moving contacts and a static contact that can be located between the moving contacts. Auxiliary contacts are formed, the inner sides of the two movabl...

AI Technical Summary

Problems solved by technology

[0003] The knife switch is one of the commonly used switches in opening and closing. It is mainly composed of two parts: a static contact and a moving contact. The two contacts of the existing knife switch often generate electric sparks at the moment of contact. The resulting high temperature will burn out the contacts, thus affecting the service life of the entire switch

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