What is the function of automotive air conditioning lubricating oil?
2 Answers
Automotive air conditioning lubricating oil functions as follows: The lubricating oil continuously flushes the friction surfaces, carrying away wear debris, reducing friction and wear of the moving parts of the air conditioning compressor, and extending the service life of the air conditioning unit. More information about air conditioning lubricating oil is as follows: 1. The refrigeration lubricating oil continuously circulates within the air conditioning system, promptly removing the heat generated during compressor operation, keeping the compressor at a lower temperature, thereby improving compression efficiency and operational reliability. It forms an oil seal between the pistons, preventing refrigerant leakage and reducing compressor noise during operation. 2. When selecting refrigeration lubricating oil, factors such as the operating state of the compressor (e.g., suction gas temperature), the type of refrigerant used, and the composition of the refrigeration oil should be considered. Generally, the selection is based on the low-temperature performance of the refrigeration lubricating oil, but its thermal stability should also be appropriately considered. 3. The structure of air conditioning compressors is divided into swash plate type and piston type, and the refrigeration lubricating oil selected should differ accordingly. Automotive air conditioning systems generally choose domestic N22, N32 refrigeration lubricating oil, or imported SUNISO-5GS refrigeration lubricating oil. Variable frequency compressors require the use of ND8, ND9 or higher types of refrigeration lubricating oil.
Air conditioning lubricating oil is like the lifeblood of the compressor. I often see cases in the repair shop where lack of oil leads to compressor failure. It mainly does three things: First, it coats precision components like compressor pistons and ball bearings, eliminating metal friction and reducing noise; second, it acts like glue to fill tiny gaps between rubber seals and metal pipes, preventing refrigerant leaks; third, it helps dissipate heat generated by friction. If you forget to top it up regularly, the compressor will dry grind, producing a harsh metal scraping sound, and cooling efficiency will decline. Whenever you hear unusual metal noises when turning on the AC, it's time to check the oil level.
