Vacuum arc-extinguishing chamber contact protection device

Abstract

The invention relates to the technical field of power equipment, and further discloses a vacuum arc-extinguishing chamber contact protection device that comprises an insulating cover, a main shieldingcover, a static contact and a moving contact; a suction pipe is fixedly connected to the inner wall of one side of the main shielding cover, a sealing piston is fixedly installed on the inner wall ofthe suction pipe, a plunger rod is arranged in the suction pipe and movably connected with the sealing piston in a sleeved mode, and an upper plunger and a lower plunger are fixedly connected to theupper end and the lower end of the plunger rod respectively. A heat collection box and the suction pipe are arranged on the two sides of the contact respectively; on one hand, part of metal steam is received in time through the side edge of the heat collection box; on the other hand, after the heat collection box absorbs heat, internal gas expands, and the lower plunger is pushed to move downwards, so that a similar injector composed of the upper plunger and the suction pipe can suck the metal steam near the contact in time; the content of the metal steam at the contact can be quickly reducedby matching with the heat collection box, the amount of the metal steam falling back to the surface of the contact is greatly reduced, and the use safety of the contact is protected.

Description

technical field [0001] The invention relates to the technical field of electric equipment, in particular to a contact protection device for a vacuum interrupter. Background technique [0002] Arc is a form of gas discharge. Gas discharge is divided into self-sustained discharge and non-self-sustained discharge. In vacuum, vacuum arc is maintained by metal vapor. When the circuit is disconnected, the high temperature will burn the contacts and insulation, and even cause phase-to-phase short circuit and electrical explosion in severe cases, thus causing fire and endangering the safety of personnel and equipment. Therefore, arc extinguishing devices are installed for electrical appliances with high voltage and frequent on-off to protect the safety of the equipment. [0003] The basic structure of the vacuum interrupter includes figure 1 The insulating cover 1, the main shielding cover 2, the static contact 3 and the moving contact 4, the movable socket of the moving contact 4...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the use process of the existing vacuum interrupter contacts proposed in the background technology, the present invention provides a vacuum interrupter contact protection device, which has the advantage of protecting the safety of the contacts and solves the above background questions raised in technology

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