Where is the difference between compressor oil and vacuum pump oil?

Compressors (air compressors, various gas compressors), chillers and vacuum pumps (mainly mechanical vacuum pumps) have special requirements for lubricating oils. Compressor oil is mainly used in the reciprocating piston type gas compressor, the discharge machine and piston pump cylinder and piston friction parts and intake and exhaust valve lubrication, etc., used in the automatic oil lubrication system, there are also lubrication and compression Machine main bearings, connecting rod bearings and crossheads, skateboards, etc., low viscosity are also used in various types of rotary compressors. Refrigerating machine oils are mainly used in compressors that compress refrigerant, and vacuum pumping oils are used in mechanical vacuum pumps in vacuum systems.

The three applications are different, but there are many common points. For example, the three are required to bear the role of lubrication in cylinders, pistons, valves, bearings, slides, and other components, but also to prevent compressed gas between the piston and the cylinder wall. Gas sealing effect, but also have the chemical stability that does not work with the compressed gas.

For reciprocating compressors, because the discharge temperature of compressed gas is higher than that of the inhaled gas, better viscosity-temperature performance, suitable viscosity and good oxidation stability are required. Deep-refined base oil is usually used (preferably Naphthenic oils) are made by adding additives that are resistant to oxidative corrosion and wear (generally peptone and tackifiers are not allowed). For the rotary compressor oil, because of its working conditions and lubrication methods, it is quite different from the reciprocating compressor, so it puts forward more stringent requirements on the quality of the lubricant. In addition to the lubrication, cooling and sealing of the rotary parts, the rotary compressor oil It also plays an important role in cooling the compressed gas. During use, the oil mist is separated and separated from the gas after mechanical collision and adsorption of the medium. The oil product can easily be contaminated and aged, and in order to overcome the centrifugal force at the same time, the oil is required. The product has good adhesiveness, and the bearing does not need lubricating oil with too much viscosity. Therefore, the rotary air compressor oil generally uses a deep-refined narrow-distillation base oil, and is added with a composite antioxidant, rust-proof, and anti-rust. Grinding, demulsification, defoaming additive production.

For the refrigerating machine oil, besides satisfying the above-mentioned basic requirements, the oil product is required to have excellent low-temperature performance and good separation from the refrigerant or moisture. Therefore, the general refrigerating machine oils are produced with deep refined naphthenic naphthenic oils. It is worth noting that when SO2 is used as refrigerating machine oil, deep refined oils containing no aromatics and sulfur oxides (such as white oils) should be selected. ) Otherwise, colloidal precipitates will affect the working of the freezer. When ethyl chloride is used as a refrigerant, it will dissolve oil, and it is generally lubricated with glycerine and castor oil. When ammonia or carbon dioxide is used as a refrigerant, it is necessary to use a lubricant that does not contain fatty oil because it is easily emulsified and is not conducive to water separation. When it is frozen, and the thermal conductivity of the fatty oil is small, the refrigeration efficiency decreases.

Vacuum pump oil is a special lubricant for mechanical vacuum pumps. Although the pumps have different types, the requirements for oil quality are the same. When the vacuum pump is running, the oil in the pump chamber acts as a seal on the one hand, so that the pump can obtain the necessary vacuum. On the other hand, the oil in the pump chamber is affected by friction, temperature, and decompression, and the components with high vapor pressure evaporate. The vacuum space pollutes the vacuum system, limiting the increase in vacuum. The role of vacuum pump oil, in addition to the required suitable viscosity, high viscosity index, good oil-water separation, excellent thermal oxidation stability, the most important quality requirements are low saturated vapor pressure and extremely strong limit, in order to ensure high The degree of vacuum. Therefore, in addition to selecting the appropriate type of base oil in the production of vacuum pump oil, a single narrow distillate oil or pure chemical should be used instead of using several distillate oils as much as possible.

More vacuum pump information is available at China Vacuum Pump Trading Network (/).

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