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A/C COMPRESSOR H4812039201A0

Different types of automotive air conditioning compressors have different working principles due to their various types. Based on the different working principles of automotive air conditioning compressors, they can be classified into fixed-displacement compressors and variable-displacement compressors.

01.

Fixed-displacement compressor

The displacement of the fixed-displacement compressor increases proportionally with the increase in engine speed. It cannot automatically adjust the power output according to the cooling demand, and has a significant impact on engine fuel consumption. Its control is generally achieved by collecting the temperature signal from the outlet of the evaporator. When the temperature reaches the set value, the compressor electromagnetic clutch releases, and the compressor stops working. When the temperature rises, the electromagnetic clutch engages, and the compressor starts working. The fixed-displacement compressor is also controlled by the pressure of the air conditioning system. When the pressure in the pipeline is too high, the compressor stops working.

02.

Variable-displacement air conditioning compressor

The variable displacement compressor can automatically adjust its power output according to the set temperature. The air conditioning control system does not collect the temperature signal from the evaporator outlet. Instead, it controls the compression ratio of the compressor based on the pressure change signal in the air conditioning pipeline to automatically adjust the outlet temperature. During the entire cooling process, the compressor is always working. The adjustment of the cooling intensity is completely controlled by the pressure regulating valve installed inside the compressor. When the pressure at the high-pressure end of the air conditioning pipeline is too high, the pressure regulating valve shortens the piston stroke inside the compressor to reduce the compression ratio, thereby lowering the cooling intensity. When the pressure at the high-pressure end drops to a certain level and the pressure at the low-pressure end rises to a certain level, the pressure regulating valve increases the piston stroke to increase the cooling intensity.

Once the compressor is driven by the engine, it continuously sucks in the low-temperature and low-pressure refrigerant vapor generated by the heat absorption and vaporization in the evaporator. After compression, it forms a high-temperature and high-pressure refrigerant vapor, which is then discharged to the condenser to create a high-pressure condition for the continuous condensation and heat release of the refrigerant in the condenser. At the same time, it overcomes the circulation resistance of the refrigerant in the refrigeration circuit.

The condenser releases the heat contained in the high-temperature and high-pressure refrigerant vapor discharged by the compressor to the outside air flowing through the condenser, and condenses the refrigerant vapor into a refrigerant liquid with a certain degree of overcooling. Most condensers are arranged in front of the radiator of the vehicle's engine compartment, and are cooled by the cooling fan and the crosswind airflow generated by the vehicle's movement.