After turning on the car air-conditioning and refrigeration switch, the cooling effect deteriorates and the engine speed will not increase, so it can be judged that there is a problem with the compressor.The reasons for the damage of the air-conditioning compressor are, the compressor valve plate is damaged; the compressor cylinder head gasket is damaged; the compressor exhaust valve is damaged or deformed; and there is a foreign body in the compressor exhaust valve gasket.The compressor is the heart of the automobile air-conditioning and refrigeration system, which plays the role of compressing and conveying refrigerant steam.Compressors are divided into two types: immutable displacement and variable displacement.According to the different working principles, air-conditioning compressors can be divided into fixed-displacement compressors and variable-displacement compressors.

The displacement of a fixed-displacement compressor increases proportionally with the increase of the engine speed. It cannot automatically change the power output according to the demand for refrigeration, and it has a relatively large impact on the fuel consumption of the engine.The variable displacement compressor can automatically adjust the power output according to the set temperature.Depending on the working mode, compressors can generally be divided into reciprocating and rotary types. Common reciprocating compressors include crankshaft connecting rod type and axial piston type, and common rotary compressors include rotary blade type and scroll type.

The air-conditioning compressor plays the role of compressing and driving the refrigerant in the air-conditioning refrigerant circuit.Air-conditioning compressors are generally installed in outdoor units.The air-conditioning compressor extracts the refrigerant from the low-pressure zone and compresses it to the high-pressure zone for cooling and condensation. The heat is emitted into the air through the heat sink. The refrigerant also changes from gaseous to liquid, and the pressure increases.