Double-contact structure of vacuum arc-extinguishing chamber

Abstract

The invention discloses a double-contact structure of a vacuum arc-extinguishing chamber, which sequentially comprises a static end cover plate, a porcelain shell and a movable end cover plate from top to bottom, a closed vacuum chamber is formed among the static end cover plate, the porcelain shell and the movable end cover plate, two static contacts are separately arranged below the static end cover plate, the top of each static contact is provided with a static guide rod extending to the outer side of the static end cover plate, and the top of each static guide rod is provided with a movable guide rod extending to the outer side of the movable end cover plate. A corrugated pipe is arranged at the top of the movable end cover plate, a movable contact is arranged in the closed vacuum chamber, two protruding structures are arranged at the top of the movable contact, the two static contacts are arranged corresponding to the protruding structures respectively, and a movable guide rod which penetrates through the corrugated pipe and is connected with the movable contact is movably connected to the movable end cover plate; the outer wall of the static contact and the outer wall of the protruding structure are respectively provided with an inclined groove, and a shielding cover which covers the static contact and the moving contact is arranged in the sealed vacuum chamber. The beneficial effects of the invention are that the current impact resistance and the service life can be improved.

Description

technical field [0001] The invention relates to a double-contact structure of a vacuum interrupter. Background technique [0002] Vacuum interrupter is the core component of medium and high voltage power switch, mainly used in power transmission and distribution control system, but also in metallurgy, mining, petroleum, chemical, railway, industry and other power distribution systems. At present, the design and manufacturing process of vacuum interrupter products on the market are relatively mature, but there are still certain deficiencies. [0003] The influence of the current passing through the vacuum interrupter on the vacuum interrupter mainly has the following two points: First, the greater the current passing through the vacuum interrupter, the higher the temperature of the arc generated at the moment of contact breaking, and the effect of the arc on the vacuum interrupter. The influence of contacts (such as ablation, aging, etc.) will also be more serious; the secon...

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Problems solved by technology

[0003] The influence of the current passing in the vacuum interrupter on the vacuum interrupter mainly has the following two points: First, the greater the current passing in the vacuum interrupter, the higher the arc temperature generated at the moment of contact breaking, and the arc has a greater impact on the vacuum interrupter. The influence of contacts (such as ablation, aging, etc.) will also be more serious; the second is that the vacuum interrupter has a maximum value of current tolerance, so when a sudden excessive current (such as a short-circuit fault) occurs in the distribution line , it will cause great damage to the vacuum interrupter

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