Vacuum load switch

Abstract

The invention provides a vacuum load switch, belongs to the technical field of a high-voltage switch and solves technical problems of poor operation stability and the like of a vacuum load switch in the prior art. The vacuum load switch comprises a base, a conductive column, a shell, a vacuum arc-extinguishing chamber, a static contact rod, a movable contact rod and a reset spring, wherein an upper end of the conductive column is connected with an upper end of the shell through a delay switch, a lower end of the shell is hinged with the base, the base is fixedly connected with a cam with a convex curved surface and a concave curved surface, a lower end of the movable contact rod abuts against the convex curved surface, the movable contact rod is contacted with the static contact rod and iscommunicated with a time delay switch, when the shell swings outwards to a first position relative to the conductive column, a lower end of the movable contact rod abuts against the concave curved surface, the movable contact rod is separated from the static contact rod, the time delay switch is kept in an on state, and when the shell continuously swings outwards to a second position relative tothe conductive column, the movable contact rod is separated from the static contact rod, and the time delay switch is switched off. The vacuum load switch is advantaged in that the vacuum load switchis simple and reasonable in structure, and operation stability of the vacuum load switch is improved.

Description

technical field [0001] The invention belongs to the technical field of high-voltage switches, in particular to a vacuum load switch. Background technique [0002] Vacuum load switch is an electrical appliance with functions between high-voltage circuit breakers and high-voltage isolation switches. It can switch on and off certain load current and overload current, and has been widely used in high-voltage power transmission and distribution. The vacuum load switch generally includes a cylindrical shell with a vacuum interrupter, a static contact rod whose lower end is inserted into the vacuum interrupter, a movable contact rod whose upper end is inserted into the vacuum interrupter and can move up and down along the vacuum interrupter, and The opening and closing device used to control the contact between the movable contact rod and the static contact rod of the vacuum interrupter. [0003] For example, Chinese patent literature (application number: 03280041.X) discloses a v...

AI Technical Summary

Problems solved by technology

However, this technical solution has the following disadvantages: when the switch is switched on and energized, the crank arms in the four-bar linkage mechanism and the energy storage mechanism are subject to continuous pressure, and are prone to slight deformation, especially at the hinge points at both ends of the crank arm. It is prone to wear and loose after one operation, which affects the control accuracy and stability of the opening and closing operation. At the same time, the opening and closing device has a complicated structure and is laborious to install, which is not conducive to reducing production costs.

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