Protecting structure for vacuum air extinguish chamber corrugated pipe under high gas pressure and application

Abstract

The invention discloses a protecting structure for a vacuum air extinguish chamber corrugated pipe under high gas pressure and application. The protecting structure comprises a hollow metal drum and a corrugated pipe outside sealing device, the hollow metal barrel is arranged at the end, positioned outside a vacuum arc extinguish chamber movable end cap, of a vacuum arc extinguish chamber movable electroconductive rod, one end of the corrugated pipe outside sealing device is arranged on the lower portion of the vacuum arc extinguish chamber movable end cap while the other end of the same is arranged outside the circumference of the hollow metal barrel, the hollow metal barrel and the vacuum arc extinguish chamber movable electroconductive rod are in welded sealing, the hollow metal barrel and the corrugated pipe outside sealing device are in direct-acting reciprocating sealing, and the corrugated pipe outside sealing device and the vacuum arc extinguish chamber movable end cap are in fixed gas sealing. By adopting magnetofluid direct-acting reciprocating sealing technology, a closed space can be formed among the inside of the vacuum arc extinguish chamber corrugated pipe, the lower portion of the vacuum arc extinguish chamber movable end cap and the movable electroconductive rod, and no high-pressure gas exists inside the closed space, so that difference of air pressure inside and outside the corrugated pipe is reduced, and breakage failure probability of the corrugated pipe can be lowered effectively.

Description

technical field [0001] The invention belongs to the technical field of vacuum interrupters, and in particular relates to a protection structure and application of a vacuum interrupter bellows under high gas pressure, which is suitable for the sealing protection of vacuum interrupter bellows under high gas pressure in power transmission level vacuum switchgear . Background technique [0002] High-voltage vacuum circuit breaker is an important switchgear in power system. Because of its advantages of small size, simple structure, and environment-friendly arc extinguishing medium, it has become a research hotspot at home and abroad. At present, high-pressure gas (such as dry air, SF 6 , CO 2 , N 2 etc.) as the external insulation of the vacuum interrupter. The bellows is a moving sealing part between the vacuum interrupter and the external insulating gas. The bellows is usually welded on the outside of the moving conductive rod and the inner opening of the moving end cover....

AI Technical Summary

Problems solved by technology

When high-pressure gas is used as the external insulating medium of the vacuum interrupter, due to the large pressure difference between the inner and outer sides of the bellows, the mechanical fatigue damage of the bellows is accelerated, which may cause the vacuum interrupter to fail due to air leakage

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