Liquid metal rheostat

Abstract

The invention provides a liquid metal rheostat. The liquid metal rheostat comprises a liquid container and a pipeline which are used for containing liquid metal and are communicated with each other, wherein the pipeline is internally provided with a moving joint which stretches outside the pipeline, is connected with an external guide line and has electrical conductivity; one end, which is positioned in the pipeline, of the moving joint is connected with a pushing device which has the same shape of the inner end surface of the pipeline and is in tight movable fit with the pipeline; a fixing joint which is used for connecting the external guide line is arranged on the tail end of the liquid container. The liquid metal rheostat provided by the invention is simple in structure and convenient in regulation and is capable of realizing electrodeless continuous change of a resistance value.

Description

Technical field [0001] The present invention relates to a varistor, and more specifically, to a liquid metal varistor. Background technique [0002] Existing varistors generally use solid wires as resistance wires, the resistance wires are wound on insulating materials, and both ends are connected to wires for use. However, if the solid varistor is used for a long time at high temperature, problems such as wire aging and resistance wire breakage are prone to occur, and the manufacturing process is complicated. [0003] In the process of soft start of AC motors, the liquid rheostat is most used. The liquid rheostat uses a chemical salt solution (such as sodium carbonate or sodium chloride aqueous solution) as the conductive medium, stringing the liquid resistance into the motor's rotor circuit, and changing the electrode plate spacing through the servo motor, thereby changing the size of the liquid resistance to achieve stepless continuity The purpose of adjusting the starting tor...

AI Technical Summary

Problems solved by technology

[0005] However, liquid rheostats are used, and heat dissipation is difficult and operation is inconvenient

[0006] (1) Usually complex in structure and bulky,

[0007] (2) Strong corrosion, prone to failures such as corrosion of the travel switch shell and poor contact of conductive contacts;

[0008] (3) The liquid solution is volatile at room temperature and needs to be replenished continuously, which increases the complexity of the operation

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