1. Good viscosity-temperature performance
The cold rotary air compressor in oil injection is heated and cooled repeatedly in the working process.Therefore, the oil viscosity should not change too much due to temperature change, should have good viscosity and temperature performance.The viscosity index of all refined compressor oils is above 90.
2, the flash point should be appropriate
Flash point refers to the temperature when the vapor pressure formed by heating oil under atmospheric pressure reaches the lower limit concentration ignited by open flame.Flash point is too high, oil distillate weight, viscosity is also large, asphaltene content is high, easy to use carbon.If the one-sided pursuit of high flash point air compressor oil, but will become unsafe factors.Therefore, the air compressor oil flash point requirements can be appropriate.
Flash point is only one of the safety indicators of oil use, air compressor oil flash point is generally controlled in more than 200℃ can be used safely
3, carbon propensity to small
The anti - carbon tendency of air compressor oil is very important for the reliable operation of compressor oil.In practical industrial use, it is not uncommon for large and medium-sized air compressor to catch fire and explode due to carbon deposition.
Asphaltene, colloid and polycyclic aromatic hydrocarbons (pahs) are the main substances which are easy to form carbon residues in oil products.Most of the above substances can be removed after the lubricating oil is deeply refined.Generally low viscosity and depth of refined lubricating oil carbon residue value is low, not easy to deposit in use.Therefore, high quality air compressor oil should be selected for deep refined base oil without residue (bright oil).Additives should also be used as gray - free additives.
 |  |
4. Base oil quality should be high
The base oil of air compressor oil generally accounts for more than 95% of refined oil, so the quality of base oil is directly related to the quality of compressor oil and refined oil level, and the quality of base oil and its refining depth has a direct relationship.Deep refined base oil, its heavy aromatic hydrocarbon, gelatinous content is less.Low carbon residue, the sensitivity of antioxidant is good, the quality of the base oil is high, it in the compressor system carbon deposition tends to be small, oil and water separation is good, the service life is relatively long.
5, base oil fraction to narrow
It is considered that improving base oil composition is the key factor to improve the quality of air compressor oil.
6, viscosity to be appropriate
Under the condition of dynamic lubrication, the film thickness increases with the increase of oil viscosity, but the friction also increases with the increase of oil viscosity.Low viscosity lubricating oil is not easy to form a strong enough oil film, will accelerate wear, shorten the service life of parts.On the contrary, lubricating oil viscosity is too high, will increase the internal friction, so that the air compressor than the power increase, so as to increase power consumption and fuel consumption, but also in the piston ring groove, on the valve, exhaust channel and other places in the formation of sediment.Therefore, the choice of the right viscosity is the correct choice of air compressor oil first problem.Xi 'an jiaotong university has proved through experiments that using the same test conditions on the same type of air compressor, the oil product with a lower viscosity brand can reduce the specific power of the air compressor by up to 10% compared with the oil product with a higher viscosity brand, but there is no significant difference in the wear of machine parts.Therefore, under the premise of ensuring lubrication, the selection of suitable viscosity grade oil has a very important impact on energy conservation and reliable operation of the compressor.