What is the automotive air conditioning tube evaporator pipe assembly
The automotive air conditioning evaporator pipeline assembly is one of the core components of the air conditioning system. It mainly consists of an evaporator, an expansion valve, a refrigerant pipeline, etc., and is responsible for vaporizing the refrigerant under low pressure to absorb heat, thereby reducing the temperature inside the vehicle.
Core function
The evaporator forms a closed-loop system with the compressor, condenser and expansion valve through pipelines. Low-pressure liquid refrigerant vaporizes and absorbs heat in the evaporator. After cooling the air flowing through it, it is drawn back by the compressor for compression, completing the heat transfer.
Structural composition
Youdaoplaceholder0 evaporator : It is usually of all-aluminum stacked or tube-belt structure, with internal channels used for refrigerant flow and air heat exchange.
Youdaoplaceholder0 expansion valve : Controls the flow of refrigerant to ensure that the low-pressure liquid refrigerant vaporizes and absorbs heat in the evaporator.
Youdaoplaceholder0 refrigerant pipeline : connects components such as the evaporator, compressor, and condenser to form a circulation path.
Youdaoplaceholder0 temperature sensor : Monitors the temperature of the evaporator, adjusts the refrigerant flow rate and fan speed to maintain a stable temperature inside the vehicle.
Working principle
The refrigerant is depressed through the expansion valve and then enters the evaporator. In a low-pressure environment, it vaporizes and absorbs heat, while the blower sends cold air into the vehicle compartment. The gaseous refrigerant is drawn back by the compressor and pushed into the condenser to complete the heat discharge, forming a cycle.
The automotive air conditioning evaporator pipe assembly is the core component of the air conditioning refrigeration system, mainly achieving the key functions of the refrigeration cycle:
Refrigeration principle
The high-pressure liquid refrigerant is atomized through the expansion valve and then enters the evaporator. In a low-pressure environment, it rapidly vaporizes and absorbs heat, reducing the surface temperature of the evaporator. When the air inside the vehicle flows through the evaporator, heat is absorbed to form cold air, achieving a cooling effect.
Structural type
Common structures include tube-sheet type, tube-belt type and stacked type. Among them, the all-aluminum stacked type and tube-belt type are the mainstream designs of passenger vehicles, featuring highly efficient heat dissipation.
Installation location
It is usually embedded inside the dashboard (on the passenger side), connected to the expansion valve through high-pressure pipes and low-pressure pipes, with high sealing requirements to ensure the cooling effect.
Work characteristics
The surface temperature of the evaporator is extremely low, and cold air needs to be sent into the carriage through the air duct
It needs to be combined with the compressor, condenser and expansion valve to form a complete refrigeration cycle
Faults in the automotive air conditioning evaporator pipe assembly are usually manifested as abnormalities in the refrigeration system. Specific symptoms include:
The cooling effect has declined.
Blockage or weld opening of the evaporator pipeline can impede the flow of the refrigerant, which in turn can cause the air conditioner to fail to cool or have poor cooling effect.
Odor and water leakage
Failure of the evaporator seal or damage to its internal structure may cause refrigerant leakage, resulting in an unpleasant smell inside the vehicle. At the same time, when the condensate water cannot be discharged, leakage will occur.
The system noise has increased.
Abnormal pipelines may cause an increase in the load of the compressor, resulting in a significant increase in the operating noise of the air conditioner.
Power system influence
Evaporator failure may indirectly lead to an increase in engine load by affecting the pressure of the refrigeration system, manifested as unstable power output, rising fuel consumption and other problems.
Maintenance suggestions
Professional equipment should be used to detect pipeline pressure and to inspect structural damage with an endoscope. Usually, damaged parts need to be replaced and the refrigerant refilled.
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