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What are the inspection and test methods for automobile air-conditioning compressors

What are the inspection and test methods for automobile air-conditioning compressors

The car's air-conditioning system is a separate sealed circulatory system. Its normal operation is related to the comfort of the ride, the economy and the safety of the car. The refrigeration compressor is the heart of the automobile air-conditioning system, and it is responsible for the compression and circulation of the system's refrigeration working fluid. Usually should be checked and tested for compression efficiency and leakage.

ZHONGCHENG

The car's air-conditioning system is a separate sealed circulatory system. Its normal operation is related to the comfort of the ride, the economy and the safety of the car. The refrigeration compressor is the heart of the automobile air-conditioning system, and it is responsible for the compression and circulation of the system's refrigeration working fluid. Usually should be checked and tested for compression efficiency and leakage.

According to Zoncen experts, to test the compression efficiency of the compressor, it is necessary to connect a three-way pressure gauge group for testing without disassembling the system. When there is a certain amount of refrigerant in the system, the engine accelerates. At this time, the pointer of the low-pressure gauge should drop significantly, and the high-pressure pressure will also rise significantly. The greater the throttle, the greater the drop of the pointer, indicating that the compressor is performing well; if it accelerates The low pressure meter pointer drops slowly and the decline is not large, indicating that the compression efficiency of the compressor is low; if the low pressure meter pointer basically does not reflect when accelerating, it means that the compressor has no compression efficiency at all.

 

The most vulnerable part of the compressor to leak is the shaft seal (also used as an oil seal). Since the compressor often rotates at a high speed and the operating temperature is high, the shaft seal is prone to leakage. When there are oil traces on the clutch coil and suction cup of the compressor, the shaft seal will definitely leak.

 

Zoncen experts believe that the main reasons for compressor damage are as follows:

 

1. The compressor is short of oil and is severely worn;

 

2. The electromagnetic clutch of the compressor slips and the friction temperature is too high;

 

3. The manufacturing quality of the compressor is defective;

 

4. The power configuration of the compressor is too small;

 

5. Excessive refrigerant or lubricating oil in the system causes damage to the compressor by "liquid hammer";

 

6. The air conditioning system is not clean, and particulate impurities are sucked in by the compressor;

 

7. The compressor operating temperature is too high or the operating time is too long.

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