It will be summer soon. It will be normal to turn on the air conditioner when you get on the bus. If the air conditioner fails to work, the hot temperature will seriously affect the driver’s driving safety of truck air conditioning .
If you can understand the structure and principle of the air conditioning system, it will help to quickly judge the cause of air conditioning failure, speed up the progress of troubleshooting, and avoid arbitrary charging by air conditioning maintenance personnel.
In fact, the air conditioning system of commercial vehicles is a relatively independent system, which is not highly related to other vehicle systems. Therefore, even if there is a fault, it will be easier to find the cause of the fault. Card friends with strong hands-on ability and learning ability suggest collecting and saving of truck air conditioning .
There are three main components of commercial vehicle air conditioner: compressor, condenser, evaporator, and other auxiliary components, including expansion valve, receiver dryer, pipeline, condensation fan, blower, temperature sensing bag, etc of truck air conditioning .
The compressor is driven by the engine through a belt. Its function is to suck in low-temperature and low-pressure refrigerant vapor, compress it to the required pressure and send it to the condenser. It is the power source of the whole air conditioning refrigerant cycle. The higher the engine speed, the faster the refrigerant circulation and the greater the refrigeration power of truck air conditioning .
The function of condenser is to transfer the heat of high-temperature and high-pressure gaseous refrigerant to the outside air to condense the refrigerant into liquid of truck air conditioning .
The condensing effect of condenser on refrigerant directly determines the refrigeration efficiency of air conditioner. There are usually three ways to improve the condensation effect: 1. Increase the flow of air through the condenser; 2. Reduce the temperature of the air passing through the condenser; 3. Keep the condenser surface clean and free from pollution of truck air conditioning .
The evaporator is usually arranged in the cab. Its function is to absorb heat from the cab and make the liquid refrigerant absorb heat and vaporize into gas of truck air conditioning .
When the compressor is running, the low-temperature and low-pressure refrigerant vapor generated in the evaporator is sucked and compressed, and then discharged into the condenser under high temperature and high pressure. It is cooled by the condensation fan. The cooled liquid refrigerant flows into the liquid receiver dryer from the bottom of the condenser.
After removing water impurities, the pure refrigerant is throttled, cooled and depressurized through the expansion valve. The low-temperature and low-pressure liquid refrigerant flows into the evaporator for heat absorption and refrigeration. The cold air is blown into the cab through the blower to reduce the temperature in the cab. The gaseous refrigerant is sucked into the compressor again after passing through the evaporator. In this way, the heat in the cab is transferred to the outside of truck air conditioning .
The core principle of air conditioning refrigeration is that the refrigerant is liquefied and exothermic in the condenser and vaporized and absorbed heat in the evaporator.
The above is the simple structure and refrigeration principle of important parts of the air conditioning system. Card friends can better judge the cause of air conditioning failure only after they understand the air conditioning structure and principle.