Automobile air conditioning general mainly by the compressor (compressor), electric clutch, (condenser, evaporator, condenser, evaporator), expansion valve, expansion valve), liquid drying (receiver drier), pipe (hoses), the cooling fan, vacuum electromagnetic valve, vacuum solenoid), idle speed device and control system, etc. Automotive air conditioning high pressure and low pressure pipe lines. High voltage side including the compressor output side, high-pressure pipe, condenser, liquid dryer and liquid line; Low voltage side, accumulation, muffler, including evaporator compressor input side and compressor oil pool.

　　Liquid dryer, is actually a storage device for refrigerants, refrigerant water and impurities. On the one hand, it is equal to the car's tank for supplementary refrigerant leak refrigerant more space. On the other hand, it is like air filter, filter out the refrigerant in the doped with impurities. Liquid there also silicone material in the dryer, have the effect of absorb the moisture.

Condenser and evaporator - although they name is different, but similar structure. They are all in a row of curved around the line is full of heat dissipation in sheet metal, to realize the outside air and the pipe material of heat exchange device. Condenser of condensing refers to the refrigerant heat from gas condensed liquid in the pipeline. Its principle and the heat dissipation of the engine water tank close (difference is in the water tank of water has always been a liquid), so it is often installed in the front, with water tank, enjoy blowing cool wind from the frontier. In short condenser is cool where you go, so that its thermal condensation. Evaporator and condenser on the contrary, it is the refrigerant heat absorbed by the liquid into gas (evaporation).

Compressor is the heart of the air conditioning refrigerating system, it is a kind of the refrigerant in the system the power source of the cycle.

Pipe - due to injection pressure refrigerant, so you have to use a metal pipe. Especially from the compressor to the condenser to the refrigerant to the expansion valve which, due to belong to high pressure section in the system, so than other pipe has a higher resistance to high pressure requirements.

Compressor - as the name implies, the compressor is compressed role, its role is to make the process to complete the switch from gas to liquid refrigerants, achieve the goal of refrigerant cooling gel. At the same time in the air conditioning system, compressor or medium in the pipeline operation pressure source, without it, the system not only refrigeration and still lose the power to run.

The classification of the compressor:

　　Piston, piston compressor structure resembles the engine, such as crankshaft, connecting rod, piston and cylinder, but because it does not produce energy, so the fuel injection nozzle, spark plugs, etc. Long-distance cargo train or bus because the space is large, so large, loss of the smaller piston compressor is often used.

Swash plate: generally used in cars and small commercial vehicles are swash plate compressor. Because of its small volume, light quality, easy to indoor installations in tiny engine configuration, so widely used.

　　Although there is a big difference in the structure, but in fact these two compressors are coming from the engine rotational kinetic energy is converted into the reciprocating movement of the piston compressor, and pipeline pressure of air conditioning system, achieve the goal of compressed refrigerant.

Car air conditioning does not need to shut down as household air conditioner every time after must stop three minutes to open, automotive air conditioning actually even in the winter should open a weekly, let the parts get lubrication. In addition, should also pay attention to dust network examination, such as attach too much dust will change in time. Located in the front of the condenser at every time of washing the car had better use high-pressure spray on them, in case of cooling blade were choked up with sundry (insects, leaves, etc.) affect the heat dissipation effect.

It is worth mentioning that of rotation of the compressor is through the magnetic clutch and powered by the belt connected to the engine crankshaft. Why do you want to have a magnetic clutch? Because when installed in the evaporator outlet sensors to the wind when the temperature is low enough, it will be through the circuit closes the compressor magnetic clutch, the compressor with the engine running, realize the refrigeration. Outlet air temperature is lower than the set temperature, and when it is to control the magnetic clutch is cut off, so that the compressor doesn't work. If the control failure, compressor will continue to work, make the evaporator freezing pipe pressure exceeds bid, eventually to damage the system or even damage.

　　At present most of the car (mainly refers to civil car) on the use of refrigerant R - 12 refrigerants and R - 134 - a refrigerant two kinds. R - 12 refrigerant is a common refrigerants, contain ozone-depleting substances - freon, and under the flame will be generated to the human body harmful substances; And R - 134 - a is a new kind of environmental protection refrigerants, is non-toxic, colorless, non-flammable, good thermal stability and other properties, more important is R - 134 - a refrigerant does not damage the ozone layer.

　　The chemical structure of these two kinds of refrigerants are different, so it is not common in the car. And they are supporting the use of refrigerant oil miscibility. If add wrong refrigerant can make system damage, such as corrosion of rubber hose, etc. Everything is used to replace R12, because its thermal properties similar to R12, is a kind of not chlorine freon, the ozone destruction system is zero, so use new car basic have everything now, that is, people often say that environmental protection refrigerants.