Screw propulsion mechanism of high-voltage AC vacuum circuit breaker

Abstract

The invention discloses a screw propulsion mechanism of a high-voltage AC vacuum circuit breaker. A propulsive plate is spliced with two screws; the two screws and an operating rod are inserted into a transmission case to form a double-screw transmission case assembly; one end of each screw, which is inserted into the transmission case, is provided with a large gear on an end head; one end of the operating rod, which is inserted into the transmission case, is provided with a small gear, and the end head of the one end of the operating rod is connected with a locked push plate; the two large gears are mutually meshed with the small gear; the double-screw transmission case assembly is arranged on the middle position inside a front assembling frame; and an interlocking lever penetrates through the front assembling frame and is provided with an interlocking crank arm. A stress point is changed from one point positioned in the middle of a single screw to a left stress point and a right stress point during feeding by adopting a double-screw structure, each stress point is half reduced in the magnitudes of stresses under the condition of unchanged feeding force, therefore the stress conditions of the front assembling frame are improved; the rigidity of the middle structure of the front assembling frame is strengthened through the design of the transmission case, and the deformation amount of the front assembling frame is obviously reduced, therefore the front assembling frame is suitable for a circuit breaker handcart with higher power.

Description

technical field [0001] The invention belongs to a high-voltage alternating current vacuum circuit breaker, in particular to a lead screw propulsion mechanism of the high-voltage alternating current vacuum circuit breaker. Background technique [0002] At present, most of the propulsion mechanisms used when the medium voltage circuit breaker enters the vehicle are single-screw type propulsion mechanisms. For example, the chassis car used in the VS1 vacuum circuit breaker widely used in the industry, or the propulsion mechanism used in the ZN85-40.5 vacuum circuit breaker, the above two types of propulsion mechanisms with the largest consumption in the industry have a rated current of 4000A and a rated short-circuit current of 50kA. and the following circuit breaker specifications are used. When this type of propulsion mechanism is used in high-current circuit breakers (rated current 5000A, rated short-circuit current 63kA and above), due to the large insertion and extraction...

AI Technical Summary

Problems solved by technology

When this type of propulsion mechanism is applied to a large-current circuit breaker (rated current 5000A, rated short-circuit current 63kA and above), due to the large insertion and withdrawal force of the dynamic and static contacts, the force of the propulsion is large, resulting in deformation of the propulsion mechanism or cannot be realized easily and conveniently. Getting in and out of the car

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