Large power thermal protector

Abstract

The invention relates to a large power thermal protector which is applied to an electric motor protection and control system. Real time temperature of an electric motor can be detected; a circuit can be disconnected rapidly when that temperature exceeds a preset threshold value, and locked rotor protection of an electric motor can be fulfilled. An outer shell of the large power thermal protector is an integrated and seal welding structure, and requirements for quality of electric motor enameled wire winding vacuum dipping paint technologies can be met. A double metal sheet structure is adopted, temperature protection covers a range from low temperature 80 DEG C to 180 DEG C, an insulating body is made of a high temperature resistant glass fiber material or a high temperature resistant ceramic material, and therefore high temperature insulation can be achieved. The large power thermal protector also comprises a built-in auxiliary movement structure, and a moving contact point can be quickly disconnected from a static contact point. The large power thermal protector disclosed in the invention is characterized by large current tolerant property and high temperature insulation property, a fully sealed structure is adopted, the large power thermal protector can adapt to vacuum dipping paint working conditions, rapid switch-off can be realized, and the large power thermal protector can be applied to the electric motor protection and control system and is characterized by excellent electric motor locked rotor protection performance.

Description

technical field [0001] The invention relates to the technical field of protection and control, in particular to a high-power temperature protector. Background technique [0002] The temperature protector is a series of automatic control elements that cause physical deformation inside the switch according to the temperature change of the working environment, resulting in some special effects and a disconnection action, so as to control the operation of the equipment to achieve the ideal temperature protection and control effect. , Its application range is very wide, and it is used in many products such as home appliances, motors, refrigeration or heating according to different types of thermostats. The bimetal sheet is also called a thermal bimetal sheet. Because the thermal expansion coefficients of each layer of metal are different, when the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the whole bimetal sheet wi...

AI Technical Summary

Problems solved by technology

[0003] The normal working current of the temperature protectors on the market is mostly within 10A, which cannot withstand high power and high current, and the insulation layer cannot achieve high temperature insulation, and the cut-off speed of the temperature protector cannot meet the sensitivity requirements of high-power devices. Therefore, the current market There is a greater demand for medium and high-power temperature protectors that can be used for high-power devices such as motors

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