Composition and working principle of automobile air conditioning system

1. Composition of air conditioning system:

The air conditioning system is mainly composed of compressor, condenser, evaporator, expansion valve, dry accumulator and pipeline.

2. Refrigeration principle:

1) After the user starts the automobile air conditioning system according to the operating procedure, the compressor starts to work under the drive of the engine, which drives the refrigerant (R 134a, which is environment-friendly and will not destroy the ozone layer, and is non-toxic, non-irritating, non-flammable and non-corrosive) to circulate in the closed air conditioning system, and the compressor compresses the gaseous refrigerant into high-temperature and high-pressure refrigerant gas, which is discharged from the compressor.

2) After the high-temperature and high-pressure refrigerant gas flows into the condenser through the pipeline, it dissipates heat and cools down in the condenser and condenses into high-temperature and high-pressure liquid refrigerant.

3) The high-temperature and high-pressure liquid refrigerant enters the drying reservoir through the pipeline, and flows into the expansion valve after drying and filtering.

4) The high-temperature and high-pressure liquid refrigerant is throttled by the expansion valve, and its state changes sharply, becoming a low-temperature and low-pressure liquid refrigerant.

5) The low-temperature and low-pressure liquid refrigerant immediately enters the evaporator, where it absorbs the heat of the air flowing through the evaporator, so that the air temperature is lowered and cold air is blown out, resulting in refrigeration effect, and the refrigerant itself evaporates into low-temperature and low-pressure gaseous refrigerant due to heat absorption.

6) The low-temperature and low-pressure gaseous refrigerant is sucked by the compressor through the pipeline, compressed and enters the next cycle. As long as the compressor continues to work, the refrigerant will continue to circulate in the air conditioning system, resulting in refrigeration effect; When the compressor stops working, the refrigerant in the air conditioning system stops flowing and does not produce refrigeration effect.

Extended data automobile air conditioning system is a device to realize air cooling, heating, ventilation and air purification in the compartment. It can provide a comfortable riding environment for passengers, reduce the fatigue strength of drivers and improve driving safety.

Air-conditioning device has become one of the symbols to measure whether the car has complete functions.

Clean the car air conditioner:

In general, there is a pollen filter at the air inlet of the automobile air conditioner, which is used to prevent the dust from entering when the automobile air conditioner circulates outdoors. When cleaning the air conditioner, remove the pollen filter, inject the foam cleaning agent into the air conditioner from the air inlet, and close the air outlet of the air conditioner to prevent the foam cleaning agent from flowing out of the air outlet.

After these two steps are completed, start the car, turn on the air conditioner, and let the foam cleaning agent circulate inside the air conditioning system. This step will last for several minutes to ensure that the foam cleaning agent circulates to all channels of the air conditioning system. About 5 minutes, turn off the air conditioner and turn off the car. It won't take long for the dust to flow out of the cabinet from the air conditioning piping system.

References:

Baidu encyclopedia-automobile air conditioning system