Automotive air conditioners are generally mainly composed of compressors ,condensers , electronically controlled clutches, evaporators, expansion valves, and receivers. Pipe, condensation fan and so on. Automotive air conditioners are divided into high pressure pipelines and low pressure pipelines.

Electromagnetic clutch: In a non-independent automotive air conditioning refrigeration system, the power of the compressor is provided by the automobile engine. The power transmission between the engine and the compressor is turned on or off as needed. In addition, when the compressor is overloaded, it can also provide some protection. Therefore, by controlling the combination and separation of the electromagnetic clutch, it is possible to control the operation of the compressor. When the air conditioner switch A/C is turned on, the current passes through the electromagnetic coil of the electromagnetic clutch, and the electromagnetic coil generates electromagnetic attraction, so that the pressure plate of the compressor is combined with the pulley, and the torque of the engine is transmitted to the main shaft of the compressor to rotate the main shaft of the compressor. When the air conditioner switch is turned off, the suction of the electromagnetic coil disappears. Under the action of the spring, the pressure plate and the pulley are disengaged and the compressor stops working.