Working principle of expansion valve of the hottes

2022-08-02
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Working principle of expansion valve of automobile air conditioning refrigeration system 1. Introduction to expansion valve:

expansion valve, also known as throttle valve, is the main component of automobile air conditioning refrigeration system. It is installed at the inlet of evaporator and is the dividing point between high pressure and low pressure of automobile air conditioning refrigeration system. Its function is to throttle and depressurize the high-pressure liquid refrigerant from the receiver dryer, adjust and control the liquid refrigerant dose entering the evaporator to adapt to the change of refrigeration load, and prevent the compressor from liquid hammer (that is, the non evaporated liquid refrigerant is compressed after entering the compressor, which is very likely to cause damage to the compressor valve plate and display the corresponding data) and abnormal overheating of the evaporator outlet steam

II. Working principle of expansion valve for automobile air conditioner:

the temperature sensing expansion valve used in the refrigeration system of automobile air conditioner, also known as the thermal expansion valve, has a size deviation of no more than 2%. It uses the temperature sensing package installed at the outlet of the evaporator to sense the superheat of the refrigerant steam (superheat refers to the value that the actual temperature of the steam is higher than the evaporation temperature), so as to adjust the opening of the expansion valve. Its structure is novel, This controls the flow of liquid refrigerant into the evaporator. The temperature sensing package is in contact with the outlet pipe of the evaporator. When the outlet temperature of the evaporator decreases, the production process of the aluminum profile mainly includes three processes: melting, casting, extrusion and coloring. The volume of the liquid in the upper chamber of the temperature sensing package, the capillary tube and the film shrinks, and the valve port of the expansion valve will be closed to restrict the refrigerant from entering the evaporator. contrary. If the evaporator outlet temperature rises, the expansion valve orifice will open. To increase refrigerant flow

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