The refrigeration compressor is the heart of the automobile air conditioning system, which is responsible for the compression and circulation of the refrigeration working fluid of the system. It should usually be checked and tested for compression efficiency and leakage.
To test the compression efficiency of the compressor, it is necessary to connect the three-way pressure gauge group for testing without disassembling the system. When there is a certain amount of refrigerant in the system and the engine is accelerated, the pointer of the low pressure gauge should drop significantly, and the high pressure pressure will also increase significantly. If the pointer of the low pressure gauge drops slowly and the drop is not large, it means that the compression efficiency of the compressor is low; if the pointer of the low pressure gauge basically does not reflect when accelerating, it means that the compressor has no compression efficiency at all.
The most likely part of the compressor to leak is the shaft seal (also used as an oil seal). Because the compressor often rotates at high speed and the operating temperature is also high, the shaft seal is prone to leakage. When there is oil on the clutch coil and suction cup of the compressor, its shaft seal will definitely leak.
The main reasons that are easy to cause compressor damage are:
1. The air-conditioning system is not clean, and particulate impurities are inhaled by the compressor;
2. Excessive refrigerant or lubricating oil in the system causes the compressor to be damaged by "liquid shock";
3. The operating temperature of the compressor is too high or the operating time is too long;
4. The compressor is short of oil, and the wear is serious;
5. The electromagnetic clutch of the compressor slips and the friction temperature is too high;
6. The power configuration of the compressor is too small;
7. The manufacturing quality of the compressor is defective.
