What is the role of the car compressor
Automotive compressor is the core component of automotive air conditioning refrigeration system, its main role includes the following aspects:
Compressed refrigerant
The compressor inhales the low temperature and low pressure refrigerant gas from the evaporator, compresses it into high temperature and high pressure gas through mechanical action, and then transmits it to the condenser. This process is a key step in the refrigeration cycle and provides the basis for the regulation of the temperature inside the vehicle.
Conveying refrigerant
The compressor ensures that the refrigerant circulates through the air conditioning system. The high temperature and high pressure refrigerant becomes liquid after cooling in the condenser, and then enters the evaporator through the expansion valve to absorb the heat in the car again and evaporate into gas to complete the refrigeration cycle.
Adjust cooling efficiency
Compressors are divided into two types: constant displacement and variable displacement. The displacement of constant displacement compressors increases in proportion to the engine speed and cannot automatically adjust the power output, while the variable displacement compressors can automatically adjust the power output according to the set temperature to optimize the cooling efficiency.
Overcome cyclic resistance
The compressor powers the flow of refrigerant in the air conditioning system, ensuring that the refrigerant can be smoothly passed through the various components to achieve a continuous cooling effect.
Protect the engine
By adjusting the pressure in the gas reservoir, the compressor can be stopped and rested, thus protecting the engine to a certain extent and avoiding increasing fuel consumption due to continuous work.
summary : By compressing and transporting refrigerant, regulating refrigeration efficiency and overcoming circulation resistance, automotive compressors ensure that the automotive air conditioning system can effectively cool and provide a comfortable environment for passengers in the car. If the compressor is faulty, the cooling function of the air conditioner cannot work properly.
The core reasons for the "rattling" abnormal sound of automotive compressors are mainly concentrated in three aspects: belt system, electromagnetic clutch failure and compressor internal wear . The following are the specific reasons and corresponding solutions:
Causes and treatment of common abnormal sound
Belt system problem
Loose/aging belt: it will cause skidding and jitter and produce abnormal sound. It is necessary to adjust the tightness or replace the new belt
Tension wheel failure: need to replace the tension wheel to restore belt tension
Electromagnetic clutch abnormal
Bearing damage: rain erosion is easy to cause abnormal clutch bearing, need to replace the bearing
Improper clearance: Installation clearance is too large or too small need to be re-adjusted to 0.3-0.6mm standard value
Repeated engagement: check the generator voltage, air conditioning pressure is normal, avoid overload
The compressor is faulty
Insufficient lubrication: Timely add special freezing oil (recommended to replace every 2 years)
Piston/valve plate wear: need professional disassembly, serious replacement of air conditioning compressor assembly
Abnormal refrigerant: excessive or insufficient refrigerant will produce flow noise. Use a pressure gauge to detect and adjust
Other possible causes
foreign matter interference : check the air conditioner filter element and air duct, clean up leaves and other foreign matter
Resonance phenomenon : resonance with engine compartment components at specific speed, need to install shock pad
installation deviation : the compressor is not aligned with the generator pulley. Recalibrate
Three, maintenance suggestions
If the cooling effect decreases due to abnormal sound, stop the air conditioner immediately and send it for repair . Internal damage to the compressor can cause metal debris to enter the entire car air conditioning system, and repair costs will increase significantly. Daily maintenance should pay attention to:
Check the belt for wear before summer each year
Replace air conditioner filter element regularly (10,000 km/time recommended)
Avoid forcing the compressor to start after a refrigerant leak
Note: The short "clack" sound may be the normal sound of the electromagnetic clutch suction, but the continuous abnormal sound needs to be vigilant.
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