Protector and socket for frequency conversion refrigeration compressor

Abstract

The invention provides a protector and a socket for a variable frequency refrigeration compressor. The protector comprises a first metal part, a second metal part separated from the first metal part, an insulating part used for fixing the first and second metal parts and keeping the first and second metal parts to be mutually insulated, a first contact connected to the first metal part, a bimetallic strip connected with the second metal part, a second contact arranged at one end of the bimetallic strip and arranged corresponding to the first contact, and a welding bracket connecting the bimetallic strip and the second metal part, wherein the first metal part comprises an integrally molded compensation resistor, and an electric switch is formed between the first and second contacts. The protector for the variable frequency refrigeration compressor provided by the invention has the advantages of being few in parts, simple and reliable in structure, low in cost and reliable in quality; the production automation degree is high, heating wires are stamped, thus the production efficiency is high, and the whole process can be designed into automatic production; changes brought about by micro currents can be felt, thereby satisfying the design trend that the current of a refrigeration compressor motor is getting smaller and smaller; and besides, the own use materials are few, the energy consumption is very low and the service life is long.

Description

technical field [0001] The invention relates to a protector and a socket for a variable frequency refrigeration compressor. Background technique [0002] As we all know, in order to maintain the normal operation of the motor and make it have a long life, it is necessary to control the temperature of the motor winding at a certain temperature to avoid the performance of the winding being affected by overheating due to overcurrent. Such overheating often occurs when the motor is started or the load is running. The current common way is to selectively connect one or more matching protection devices between the connection of power supply at one or more positions of the winding. The common way is to use a thermostat to sense the winding temperature. When the temperature of the motor rises and begins to endanger the overall quality, and exceeds the operating temperature of the thermostat, the thermostat will start to act and cut off the circuit to protect the stator and rotor win...

AI Technical Summary

Problems solved by technology

However, the thermostat has a flaw: when the coil temperature rises too fast, such as during the motor start-up phase, the thermostat cannot ensure quick response and cut off the power supply; The rising winding temperature, the perceived temperature will always be lower than the latter, and when the action disconnects the circuit, the winding may have been overheated and damaged or burned

[0004] 1) The extra heating device is generally connected to the protection device by welding, which makes the assembly of the refrigeration compressor protector complicated and increases the cost;

[0005] 2) Ordinary refrigeration compressor protectors cannot adapt to different applications. Since there are many temperature / current changes in actual applications, in order to adapt to these changes, the resistance of the heating device must be changed, that is, different resistance wires need to be used. This brings about the complexity of the product model and the duplication of the production process;

[0006] 3) Due to unavoidable manufacturing errors, in each protector for refrigeration compressors, the size of the extra heating device from the bimetal is inconsistent, although the distances are all within the allowable range, there are still differences, and The sensitivity of the bimetal sheet to temperature is related to this distance, so its response to temperature is also changing, so it is difficult to guarantee the same performance of all products;

[0007] 4) Moreover, during the process of opening and closing, the contacts will be severely worn under the influence of mechanical and electrical effects, which will affect the durability and cycle times of the product

[0008] Moreover, in order to meet the installation requirements of the protector for inverter refrigeration compressors, sockets must be provided for coordinated use. The protectors for inverter refrigeration compressors should be replaceable, which can meet the diversification of the corresponding matching compressor models and realize one-to-many , that is, a frequency conversion board can match a variety of compressors by replacing the protector, thereby reducing the number of frequency conversion boards, which is conducive to inventory management and cost optimization, and is also easy to replace and maintain. The existing frequency conversion refrigeration compressors use protection sockets cannot meet the above requirements

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