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Vacuum pumps (mainly mechanical vacuum pumps), compressors (air compressors, various gas compressors) and freezers have special requirements for lubricating oils. Vacuum pump oil is used in the vacuum system in the mechanical vacuum pump, the compressor oil is mainly used in the reciprocating piston gas compressor, conveyor and piston pump cylinder and piston friction parts and into the exhaust valve lubrication, Used in the automatic oil lubrication system, there are also lubrication of the compressor main bearing, connecting rod bearings and cross head, skateboard, low viscosity is also used in all kinds of rotary compressor. The refrigerating machine oil is mainly used on compressors that compress the refrigerant.
 
The use of three different, but there are many in common, for example, in addition to the three in addition to the cylinder, piston, valve, bearings, skateboards and other mechanical parts at the same time bear the role of lubrication, but also bear to prevent the piston and cylinder wall compressed gas channeling Gas seal, and also with the compressed gas does not work with the chemical stability.
 
Vacuum pump oil is a mechanical vacuum pump for lubricants, although the pump has a different type, but the requirements of the quality of oil is the same. Vacuum pump in operation, the pump cavity of the oil on the one hand plays a sealed role, so that the pump to obtain the necessary vacuum, on the other hand pump oil by friction, temperature, decompression, vapor pressure components evaporate To vacuum the space pollution vacuum system, limiting the vacuum to improve. Vacuum pump oil, in addition to the requirements of the appropriate viscosity, high viscosity index, good oil and water separation, excellent thermal oxidation stability, the most important quality requirements are low saturated vapor pressure and extreme strong, to ensure high Vacuum degree. Therefore, in addition to selecting the appropriate base oil type in the production of vacuum pump oil, the Hautede mall should also use a single narrow distillate oil or pure chemical and do not mix several distillates as much as possible.

For reciprocating compressors, since the discharge temperature of the compressed gas is higher than that of the inhalation, it is necessary to have good viscosity-temperature performance, suitable viscosity and good oxidation stability, and usually a deep-refined base oil (preferably Naphthenic oil), added antioxidant corrosion and anti-wear properties of the additives made of (generally not allowed to add pour point depressant and tackifier). For the rotary compressor oil because of its working conditions and lubrication with the reciprocating compressor is very different, so the quality of lubricants put forward more stringent requirements, rotary air compressor oil in addition to the mechanical lubrication, cooling, sealing , But also highlight the role of cooling the compressed gas, in the course of the use of oil mist through the mechanical collision and adsorption medium and gas separation, repeated cycle, the oil can easily be contaminated and aging, and in order to overcome the rotary centrifugal force, the need for oil Products have better adhesion, and the bearing without too much viscosity of the lubricating oil, so rotary air compressor oil generally use deep refining narrow fractions of base oil, and add a composite antioxidant, rust, Grinding, demulsification, defoaming additives.
 
For refrigerating oil, in addition to meet the above basic requirements, the need for oil has excellent low temperature performance, and the separation of refrigerant or moisture is good. Therefore, the general refrigeration oil are used in deep refining of low pour point naphthenic base oil production, it is worth noting that, in the use of SO2 as refrigeration oil, to use the depth of refined non-aromatic and sulfur oxides of lubricants (such as white oil ), Otherwise, will produce colloidal precipitation affect the freezer work. Chloroethane as a refrigerant, will dissolve the oil, the general use of glycerol and castor oil lubrication; with ammonia or carbon dioxide as a refrigerant, the use of non-fat oil lubricants, because the fat oil is easy to emulsify, is not conducive to water separation And to the icing, and the thermal conductivity of the fat oil is small, so that the freezing efficiency is lowered.

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