What Is The AC System in A Car(2)?

• The composition of the air conditioning system: The automotive air conditioning system can be divided into several main components such as the refrigeration system, the heating system, the ventilation, and air purification system, and the control system according to its functions.
• Composition of the air conditioner: Assemble the evaporator, warm air radiator, centrifugal fan, operating mechanism, air intake cover, and shell, etc., and arrange it under the dashboard in the car.
• Air-conditioning refrigeration system: All automobile refrigeration systems are generally composed of compressors, condensers, liquid storage dryers (liquid collectors), throttling devices (expansion valves or expansion tubes) and evaporators, and other components

Refrigerant is the "heat carrier" in the air-conditioning and refrigeration system. It can change state according to the requirements of the air-conditioning and refrigeration system to realize the refrigeration cycle.

The function of the compressor: compress the low-temperature and low-pressure refrigerant into high-temperature and high-pressure vapor, and provide cycle power for the refrigerant in the air-conditioning and refrigeration system.

A/C compressor

The compressor clutch turns on and off the power of the compressor according to the needs. It is a part of the compressor pulley assembly and mainly consists of a pressure plate, a rotor and a stator. When replacing the compressor, the original clutch assembly can be installed on the new compressor.

The function of the condenser is to transform the high-temperature and high-pressure refrigerant gas discharged from the compressor into a high-temperature and high-pressure refrigerant liquid and at the same time dissipate the energy absorbed by the refrigerant from the evaporator and the work done by the compressor into the atmosphere.

Condensers are divided into tube-sheet type, tube-belt type, and parallel flow type according to the structure. The tube belt type has higher heat transfer efficiency than the tube fin type, and the parallel flow condenser is a new type of condenser developed to adapt to R-134a refrigerant, breaking through the limitations of the former two, and the heat transfer efficiency is higher

Expansion valve and expansion tube

The function of the evaporator: expand and evaporate the low-pressure, low-temperature liquid refrigerant passing through the expansion valve into a gaseous state, absorb the heat in the car cabin, and reduce the temperature of the air in the car.

Receiver drier or receiver

Pressure switches are generally equipped with pressure protection switches in the air conditioning refrigeration system, there are two kinds of high-pressure protection and low-pressure protection. The components that realize this protection function are high-voltage switches and low-voltage switches or high-voltage and low-voltage combined switches.

The main function of the car air-conditioning heating system: is to adjust the temperature of the car compartment to a comfortable temperature when driving in cold temperatures; in addition, it also plays the role of defrosting the glass on the car.

Automobile air conditioning heating systems can be divided into waste heat type and independent type according to the source of heat, and waste heat type heating systems can be divided into water heating type and air heating type according to different heating media.

The heater and the blower are combined together, called the heater, which is the most important part of the air conditioning heating system, and the heat provided by the heating system is generated here.

The air conditioner manual adjustment system can be divided into a pull-cord type control mechanism and a vacuum type control mechanism according to the difference of the control mechanism. The temperature and air duct of the air-conditioning system of the pull-cord control mechanism are adjusted by adjusting the control key to drive the puller connected thereafter. rope to achieve.

According to different control modes, the automatic adjustment system can be divided into electro-pneumatic control and microcomputer control.

The air conditioning ventilation system has three main functions

Conveying and distributing air with adjusted temperature and humidity into the compartment;

Guide the outside air into the car to keep the air inside the car fresh and clean;

Keep the air pressure inside the car slightly higher than the outside air pressure to prevent the outside air from directly entering the car without going through the air conditioning system.