The compressor is the source of power in the whole refrigeration system and plays a decisive role. It has the laudatory name of "heart". To put it simply, it is through the work of the motor to make the piston rotate so as to compress the incoming low-pressure gas to high-pressure gas. In the refrigeration system, the refrigerant cools and condenses from the low pressure area (evaporator) to the high pressure zone (condenser) through the compressor, the converted heat energy is dissipated through the heat exchanger, and the refrigerant changes from the gaseous state of high temperature and high pressure to the liquid state of low temperature and high pressure. at this time, the pressure is reduced through a capillary and other throttle mechanism, and in the process of passing through the evaporator, the state of the refrigerant changes from high-pressure liquid to low-pressure gas again. At this point, after entering the compression of the compressor, an overall refrigeration cycle is completed. The principle of the heating system is exactly the opposite of the refrigeration system.