Introduction to the working principle of air conditioning compressor

- Aug 24, 2020-

Introduction to the working principle of air conditioning compressor

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The air-conditioning compressor is used to compress and drive the refrigerant in the air-conditioning refrigerant circuit. The air conditioner compressor is generally installed in the outdoor unit. The air-conditioning compressor extracts the refrigerant from the low-pressure zone, compresses it, and sends it to the high-pressure zone for cooling and condensation. The heat is dissipated into the air through the radiating fins. The refrigerant also changes from gas to liquid, and the pressure increases.


The working circuit of the air-conditioning compressor is divided into evaporation zone (low pressure zone) and condensation zone (high pressure zone). The indoor unit and outdoor unit of the air conditioner belong to the low pressure or high pressure area respectively (depending on the working status). The refrigerant then flows from the high-pressure area to the low-pressure area, and is injected into the evaporator through the capillary tube. The pressure drops sharply, and the liquid refrigerant immediately becomes gaseous, and absorbs a large amount of heat in the air through the heat sink. In this way, the air-conditioning compressor keeps working, and continuously absorbs the heat at one end of the low-pressure zone into the refrigerant and then sends it to the high-pressure zone to be dissipated into the air, thereby regulating the temperature.The compressor is the heart of the refrigeration system. Whether it is air conditioning, cold storage, chemical refrigeration technology, etc., the compressor must be an important link to ensure!

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How does the compressor compress gas?


Simply put, it is to complete the gas compression and delivery process by changing the volume of the gas! Any power equipment needs a motive force to complete the work, the compressor is the same, it needs an electric motor (motor) to drive. Positive displacement compressors are divided into reciprocating piston type and rotary type.

1. The reciprocating piston type changes the gas working volume through the reciprocating movement of the piston in the cylinder; the piston compressor has a long history and mature production technology.

2. Rotary compressors include scraper (sliding vane) rotary compressors and screw compressors. At present, most domestically produced air conditioners use rotary compressors; screw compressors are mainly used in large refrigeration equipment.

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The refrigeration system is mainly divided into several equipment: compressor-condenser-throttling device-evaporator. Its basic principle is this. The compressor compresses the refrigerant into a high-pressure saturated gas (ammonia or freon), and this gaseous refrigerant is condensed by the condenser. After throttling by the throttling device, it is passed into the evaporator to cool and exchange heat for the medium that needs to be cooled. For example, if the evaporator is connected to each room in the building, the serpentine tube in the evaporator will exchange heat with the air, and then the cold air will be blown into the air in the room through blast. The refrigerant in the coiled tube of the evaporator turns into low-pressure vapor and returns to the compressor after heat exchange, and then is compressed by the compressor, thus completing the refrigeration system by recycling.