Modern air conditioning systems are composed of refrigeration systems, heating systems, ventilation and air purification devices and control systems.
1. Ventilation system: Its function is to ensure indoor ventilation when the car is running, that is, to continuously inject fresh air into the car room to drive and exhaust dust, carbon dioxide and harmful gases from the engine. In the cold winter, fresh air should also be heated to ensure a suitable indoor temperature.
2. Heating system: Its function is to heat the air in the vehicle interior or the fresh air entering the vehicle interior from the outside to achieve the purpose of heating and dehumidification.
3. Refrigeration system: Its function is to reduce the temperature inside the car when the ambient temperature outside the car is high, so that passengers feel cool and comfortable.
4. Air purification system: its function is to filter the introduced air, continuously remove the dirty gas in the car interior, and keep the air in the car clean.
5. Control system: The control system is mainly composed of electrical components, vacuum pipelines and operating mechanisms. Its function is to control the temperature and pressure of the refrigeration and heating system on the one hand, and to control the temperature, air volume and flow direction of the air in the car interior on the other hand to improve the various functions of the air conditioning system.
Automobile air conditioners are generally composed of compressors, electronically controlled clutches, condensers, evaporators, expansion valves, receiverdriers, pipes, condensing fans, and vacuum It is composed of solenoid valve (vacuumsolenoid), idler and control system. Automobile air conditioners are divided into high-pressure pipelines and low-pressure pipelines. The high-pressure side includes the compressor output side, high-pressure pipeline, condenser, receiver dryer and liquid pipeline; the low-pressure side includes the evaporator, accumulator, return line, compressor input side and compressor oil pool.
The receiver dryer is actually a device that stores refrigerant and absorbs refrigerant moisture and impurities. On the one hand, it is equivalent to the fuel tank of a car, replenishing refrigerant for the extra space for leaking refrigerant. On the other hand, it is like an air filter to filter out impurities doped in the refrigerant. A certain amount of silica gel is also contained in the liquid storage dryer to absorb water.
Condenser and evaporator-although they are called differently, they are similar in structure. They are devices that are covered with metal sheets for heat dissipation on a row of winding pipes to realize heat exchange between the outside air and the material in the pipe. Condensation of the condenser refers to the heat dissipation of the refrigerant in its pipeline from a gaseous state to a liquid state. Its principle is similar to that of the engine's cooling water tank (the difference is that the water in the water tank is always liquid), so it is often installed in the front of the car, and together with the water tank, they can enjoy the cool breeze from the front. In short, where is the condenser cooler, so that it can dissipate heat and condense. The evaporator is the opposite of the condenser. It is the place where the refrigerant changes from liquid to gas (that is, evaporates) to absorb heat.