Shorting switch for starter of brushless hydraulically-damped motor

Abstract

A shorting switch for a starter of a brushless hydraulically-damped motor mainly solves the problem of a conventional vacuum switch that arcs are generated between a movable contact and a fixed contact during starting of a motor. The shorting switch is characterized in that a movable contact (1), a conductive push rod (3), a centrifugal block (4) and a pressing spring (5) are arranged in a guide sleeve (6), wherein a spacing ring (61) and a annular groove (62) are arranged on the inner wall of the guide sleeve (6); a radial through hole (11) is formed on the movable contact (1); a spring (12) and two steel balls (13) are arranged in the through hole (11); the conductive push rod (3) penetrates the spacing ring (61); and the pressing spring (5) is placed between the centrifugal block (4) and the spacing ring (61). By adopting the shorting switch, the movable contact and the fixed contact are instantly connected during start of the motor, arcs can not be generated in insulating liquid, the hazard caused by the arcs is radically eradicated, and the insulating liquid satisfies the functions of lubrication, heat dissipation, insulation, arc extinguishing and the like on the movable contact, the fixed contact, the conductive push rod and the centrifugal block.

Description

technical field [0001] The invention relates to a liquid resistance starter for a winding type three-phase asynchronous motor, in particular to a short circuit switch for a brushless liquid resistance motor starter. Background technique [0002] Chinese patent CN201020100993.7 discloses a brushless liquid-resistance vacuum motor starter, which includes a starter fluid storage tank, a shaft sleeve through which the power supply shaft is inserted, and a vacuum switch. The starter fluid storage tank is separated into two chambers by a sealed partition One chamber stores the starting liquid and sets the polar plate, the other chamber is equipped with a vacuum switch, and the sealing partition is provided with terminal posts, the terminal posts are electrically connected with the polar plate and the vacuum switch respectively, and the terminal posts are electrically connected with the external motor and form a Circuit, the external motor circuit is connected after the moving cont...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of electric arc generated between the moving contact and the static contact of the existing vacuum switch during the starting process of the motor, the present invention provides a brushless liquid resistance motor starter shorting switch, the shorting switch is used during the motor starting process The middle moving contact and the static contact are connected instantaneously, no arc will be generated in the insulating liquid, and the harm caused by the arc will be completely eradicated

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