;1. The air conditioning compressor compresses the refrigerant into a gas state of high temperature and high pressure, and sends it to the condenser for cooling.

2. After cooling, the liquid refrigerant with medium temperature and high pressure enters the drying filter for filtration and dehumidification.

3. The medium temperature liquid refrigerant is throttled and depressurized by the expansion valve, and becomes a low temperature and low pressure gas-liquid mixture.

4. It flows through the evaporator to absorb the heat in the air and vaporize, becoming a gas state, then returns to the compressor to continue the compression cycle.