Silver contact structure and manufacturing method of a contact system

Abstract

The invention provides a silver contact point structure of a contact system and a manufacture method, and relates to improvement technology of a contact point of a contactor or a breaker. The silver contact point structure comprises a fixed contact, a fixed contact silver contact point, a moving contact silver contact point, and a moving contact. Protruding points are arranged on contact points of the fixed contact and the moving contact. Groove surfaces are arranged in the fixed contact silver contact point and the moving contact silver contact point in a pressing mode. The groove surfaces of the fixed contact silver contact point and the moving contact silver contact point and the protruding points of the fixed contact and the moving contact are welded together. The manufacture method comprises the following steps: 1, the protruding points are processed on the contact points of the fixed contact and the moving contact; 2, the groove surfaces are arranged in the fixed contact silver contact point and the moving contact silver contact point in a pressing mode; and 3, the fixed contact silver contact point and the moving contact silver contact point are respectively welded on the fixed contact and the moving contact. According to the silver contact point structure of the contact system and the manufacture method, silver contact point mechanical strength is high, locating is easy and accurate, operation is convenient and efficiency is high in the process of welding, welding is firm, smoothness for current to pass through the contact points is good, resistance impedance is reduced, silver materials are reduced, and cost is lowered.

Description

technical field [0001] The invention relates to an improvement technology of a contact point of a contactor or a circuit breaker, in particular to a silver contact structure and a manufacturing method of the above-mentioned contact system. Background technique [0002] The dynamic and static contacts on the contact system of a general contactor or circuit breaker will generate instantaneous high temperature and sparks at the contact points of connection and disconnection, which will cause the contact points to be prone to electrolysis and oxidation after multi-frequency use. , so the contact point is made of thickened polymer metal silver to make the contact point, so it is called silver contact. [0003] The silver contacts currently used are powder pressed. Considering the breaking index of the product, mechanical life and electrical life, the thickness of the silver contact is not greater than 0.8mm to meet the product performance and design indicators; if the processing ...

AI Technical Summary

Problems solved by technology

[0003] The silver contacts currently used are powder pressed. Considering the breaking index of the product, mechanical life and electrical life, the thickness of the silver contact is not greater than 0.8mm to meet the product performance and design indicators; if the processing technology meets the requirements, the design of the silver contact In the form of a thin sheet with a thickness of about 1 mm, it can actually meet the product performance and design indicators, but the thickness of the powder-pressed silver contact has a great relationship with the contact area. After the contact area is enlarged, the thickness of the powder-pressed silver contact also increases. Correspondingly, the thickness should be increased, otherwise, the mechanical strength of the contacts will not meet the performance requirements, and the welding process will also be easily deformed; therefore, the thickness of the current contacts is not less than 2mm; however, after the thickness of the silver point is increased, the contact material The cost will increase a larger proportion

[0004] Now, the silver sheet made of powder metallurgy to solve the above problems is used as the silver contact. Such a silver sheet has only a flat structure on the contact surface welded with the contact. The positioning is inaccurate and inconvenient, so it is often necessary to use fixtures to achieve welding. At the same time, the cost of thickening the silver sheet also increases greatly. After reducing the thickness of the silver sheet, the mechanical strength cannot meet the design requirements.

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