Vacuum circuit breaker

Abstract

The invention discloses a vacuum circuit breaker, which comprises a first outer casing, a second outer casing, fixed contacts and movable contacts arranged in the first outer casing, and vacuum is drawn inside the first outer casing; the first outer casing is located in the second Inside the outer casing, and the first outer casing and the second outer casing have the same top surface; the cavity between the first outer casing and the second outer casing is evacuated; it also includes a gas nozzle, a piston, and a sealing cover; it also includes a buffer device; The buffer device includes a first circular sheet and a second circular sheet, the plane where the first circular sheet is located is parallel to the plane where the second circular sheet is located, and the distance between the first circular sheet and the second circular sheet is are connected by multiple springs. The present invention adopts the structure of the buffer device and the first outer casing and the second outer casing to greatly improve the airtightness.

Description

technical field [0001] The invention relates to a vacuum circuit breaker, which belongs to the technical field of electric equipment. Background technique [0002] Vacuum circuit breaker is named for its arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are both high vacuum; it has the advantages of small size, light weight, suitable for frequent operation, and no maintenance for arc extinguishing. The application is more popular. Vacuum circuit breaker is an indoor power distribution device in 3-10kV, 50Hz three-phase AC system, which can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations, especially suitable for oil-free, less In places where maintenance and frequent operations are used, circuit breakers can be configured in central cabinets, double-layer cabinets, and fixed cabinets to control and protect high-voltage electrical equipment. The tradit...

AI Technical Summary

Problems solved by technology

Through trial and error and engineering application of this invention, it is found that the bearing connection between the "conductive joint" and the "moving conductive block" often appears intermittent non-connection state, so that although the fixed contact and the moving conductive block of the movable contact Connected but briefly disconnected between the Conductive Joint and the Moving Conductive Block

In addition, the connection between the fixed contact and the movable contact is controlled in a pneumatic way, and it is easy to cause an instant hard collision between the fixed contact and the movable contact at the moment of connection, so that the airtightness of the fixed contact and the outer shell is often damaged

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