Vacuum circuit breaker

Abstract

The invention discloses a vacuum circuit breaker, which comprises a first outer shell, a second outer shell, a fixed contact, a movable contact, an air faucet, a piston, a seal cover and a buffer device, wherein the fixed contact and the movable contact are arranged in the first outer shell; the inside of the first outer shell is vacuumized; the first outer shell is located in the second outer shell; the first outer shell and the second outer shell have a common top surface; a hollow cavity between the first outer shell and the second outer shell is vacuumized; the buffer device comprises a first round sheet and a second round sheet; a plane in which the first round sheet is located is parallel to the plane in which the second round sheet is located; and the first round sheet is connected with the second round sheet through a plurality of springs. By the buffer device and the structure of the first outer shell and the second outer shell, the air tightness can be greatly improved.

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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