Air conditioning device is used to adjust and control the temperature, humidity, air cleanliness and air flow in the car compartment in the best condition, to provide a comfortable ride environment for the occupants and reduce travel fatigue; to create a good working condition for the driver. Ensure that the safety of the vehicle plays an important role in ventilation. Generally include refrigeration equipment, heating equipment and ventilation equipment. This joint device makes full use of the limited space inside the car, the structure is simple, and it is easy to operate. It is a popular modern automobile air conditioning system in the world.