Enclosed high-power vacuum three-phase AC contactor

Abstract

The invention provides an enclosed high-power vacuum three-phase AC contactor comprising vacuum switching tubes. Connection and disconnection of a circuit are realized by the mechanical motion of the contacts in the vacuum switching tubes. Each vacuum switching tube is provided with a pressure spring, and one end of the pressure spring abuts against the vacuum switching tube. A rotating arm is also arranged below each corresponding vacuum switching tube. An armature is arranged on the rotating arm through a metal insert. The armature is a conical armature. The lower edge of the armature is convex, and threads are arranged in the insert and matched with a screw to fix the insert. The total holding moment affected by the armature is increased so that holding current and holding power consumption of coils can be reduced; the absorption ampere turns are reduced and the absorption power consumption of the coils can be reduced; fixing of the armature and the rotating arm is enhanced so that the situation that the armature is loose and the contactor is not absorbed to the position can be effectively avoided; and the vertical position relation of conductive plates and installing holes is adjusted and connection application with a copper bar is facilitated so that product application and installation are convenient and the structure is simple and compact.

Description

technical field [0001] The invention belongs to the field of contactors, in particular to a closed high-power vacuum three-phase AC contactor. Background technique [0002] High-power vacuum three-phase AC contactors are widely used in various fields such as wind power generation, new energy, power systems, petroleum, chemical industry, coal mines, metallurgy and electrified railways, for connecting and breaking circuits. The closed high-power vacuum three-phase AC contactor is a mechanical switch, which realizes the connection and breaking of the circuit through the mechanical movement of the contact in the vacuum switch tube. First, the fixing method of the armature in the existing contactor is to fix the armature spring washer to the rotating arm. The armature spring washer is directly fastened and fixed on the rotating arm with self-tapping screws. The rotating arm is made of SMC material and is hard and not easily deformed. The armature collides with the iron core, and...

AI Technical Summary

Problems solved by technology

First, the fixing method of the armature in the existing contactor is to fix the armature spring washer to the rotating arm. The armature spring washer is directly fastened and fixed on the rotating arm with self-tapping screws. The rotating arm is made of SMC material and is hard and not easily deformed. The armature collides with the iron core, and the self-tapping screw is easily loosened by the force, which affects the working air gap between the armature and the iron core, and the contactor does not pull in place; second, the existing vacuum contactor adopts a flat armature structure, and the coil work Third, the existing vacuum three-phase AC contactor has a mounting hole directly below the conductive plate, which is extremely inconvenient when installing fastening bolts; fourth, the existing vacuum contactor cannot judge the on-off state of the contactor externally

[0003] At present, there are high-power three-phase vacuum AC contactor products with a rated current between 1250A and 1350A. The existing problems are: 1. The armature is easy to loose; 2. The power consumption of the coil is high; 3. The product is not convenient to use and install.

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