Vacuum circuit breaker

Abstract

The invention discloses a vacuum circuit breaker, comprising a shell and a vacuum arc-extinguishing chamber, wherein the upper end of the vacuum arc-extinguishing chamber is provided with a current-conducting plate, a movable contact at the lower end of the vacuum arc-extinguishing chamber is connected with a push rod, the lower part of the push rod is provided with a driving plate, one end of the driving plate is arranged on supporting point, the upper end of the driving plate is provided with an upper groove, a wear-resistant block is arranged in the upper groove, the center of the wear-resistant block is provided with a central hole, a compressing spring is pressed between the driving plate and a step in the middle of the push rod, the rear end of the compressing spring is pressed on the front end face of the wear-resistant block, the lower half part of the driving plate is provided with an arc-shaped groove, the rear end of the push rod penetrates through piercing holes, the tail end of the push rod is provided with a limiting nut which is adapted to the arc-shaped groove in contour shape, the area of the limiting nut is smaller than the area of the arc-shaped groove, and the limiting nut is enabled to be positioned in the arc-shaped groove. After the structure is adopted, stress concentration caused by complete rigid vertical connection between the driving plate and the push rod traditionally is completely changed, and wear is effectively reduced.

Description

[0001] technical field [0002] The invention relates to a circuit breaker, in particular to a vacuum circuit breaker, which belongs to the technical field of electric power system power distribution equipment. Background technique [0003] Existing vacuum circuit breakers generally include a static contact and a moving contact. The moving contact has a driving arm to drive up and down to realize the operation of opening and closing, and the driving plate is generally arranged perpendicular to the insulating pull rod. Using the existing structure, due to the need to transmit power between two vertical components, it is inevitable to cause a relatively large stress concentration at the intersection of the two components, so in practice, it is often necessary to repair and replace this part of the component, which not only delays working hours, but also causes Waste of capital costs. Contents of the invention [0004] The technical problem to be solved by the presen...

AI Technical Summary

Problems solved by technology

[0003] Existing vacuum circuit breakers generally include a static contact and a moving contact. The moving contact has a driving arm to drive up and down to realize the operation of opening and closing, and the driving plate is generally arranged perpendicular to the insulating pull rod. Using the existing structure, due to the need to transmit power between two vertical components, it is inevitable to cause relatively large stress concentration at the intersection of the two components, so in practice, it is often necessary to repair and replace this part, which not only delays working hours, but also causes waste of capital cost

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