Double-break vacuum arc-extinguishing chamber porcelain seat structure and double-break vacuum circuit breaker

Abstract

The invention discloses a double-break vacuum arc-extinguishing chamber porcelain seat structure and a double-break vacuum circuit breaker, and belongs to the technical field of vacuum circuit breakers, and the double-break vacuum arc-extinguishing chamber porcelain seat structure comprises an inner porcelain seat, an arc blocking cover and an outer porcelain seat which are sequentially sleeved from inside to outside; the lower parts of the inner porcelain seat and the outer porcelain seat are respectively of a gradually-shrinking structure and a gradually-expanding structure and form an arc blocking space; the arc blocking cover comprises an arc blocking cover cylinder clamped between the outer porcelain seat and the inner porcelain seat and a cover body connected to the lower end of the arc blocking cover cylinder; the cover body is arranged in the arc blocking space and is used for blocking opening and closing arcs. The structure is simple, the size is small, and porcelain base firing is easy to achieve; good impact resistance and a high-strength structural form are achieved, and impact fracture is effectively avoided; the creepage distance between the inner insulation and the outer insulation is effectively increased, and the safety performance of the vacuum arc-extinguishing chamber is ensured; the cover body can isolate and block metal boil-off gas generated by the electric arc, the side wall of the arc blocking space is prevented from being polluted, the insulation performance of the outer porcelain seat and the inner porcelain seat is prevented from being damaged, and the use safety and reliability are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of vacuum circuit breakers, in particular to a double-fracture vacuum interrupter porcelain seat structure and a double-fracture vacuum circuit breaker. 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 a three-phase AC system. It can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants, and substations. It is especially suitable for applications that require no oil, less maintenance, and frequent operations. Where it is used, the circuit breaker can be configured in central cabinets, double-layer ...

AI Technical Summary

Problems solved by technology

[0004] Nowadays, the ceramic base of the double-break vacuum circuit breaker is generally a stepped structure, and there are dislocation defects. When the auxiliary moving contact is closed and impacted, the porcelain base is prone to breakage at the step connection part, which poses a safety hazard; and because the ceramic base itself Due to the characteristics of the material, one firing is required after forming, and two firings are required for brazing. For the firing process, the wall thickness is required to be as uniform as possible; and the stepped structure of the porcelain seat cannot be well adapted to the firing process.

Images