1. higher quality base oils
Base oil compressor oil can be divided into mineral and synthetic oil-type two categories. Mineral oil-based compressor oil production in general, by solvent refining, solvent dewaxing, hydrogenation or clay added refining and other processes to obtain the base oil, then add a variety of additives blending together.
Base oil compressor oil generally accounts for more than 95% of oil products, the quality of the merits of the base oil is directly related to the quality level of the compressor oil refined oil products, and the quality of base oil and its refining depth has a direct relationship. Deep depth of refined base oils, its heavy aromatics, less gum content. Low carbon residue, antioxidants like sensitivity, high-quality base oils is, it tends to a small coke in the compressor system, water separation is good, life is comparatively longer.
Type synthetic base oils are obtained by the method of chemical synthesis of organic liquid and then after the deployment of base oil or adding a variety of additives in lubricants. Most of its base oil is a polymer or polymer organic compound. Many different types of synthetic oil, synthetic oil used as a compressor oil mainly synthetic hydrocarbons (poly-α- olefins), five kinds of organic esters (di-esters), polyalkylene glycol, silicone oil, and fluorine phosphate. Synthetic compressor oil prices more expensive than mineral oil-based compressor oil is much, but the overall economic benefits of synthetic oil is still more than ordinary mineral oil. It has oxidation stability, small coke tendency may be more than ordinary mineral lubricating oil temperature range, long life, to meet the general mineral oil-based compressor oil can not afford the requirements.
2. To narrow base oil fractions
Compressor oil condition that: improve the base oil constitutes compressor oil is to improve the quality of the key factors. After the light and heavy two components tone synthetic compressor oil into the compressor cylinder, wherein the light components due to excessive volatility prematurely leave the work site affect the lubricating effect, and one of the heavies volatile due to poor finish can not leave the job after the task quickly work sites, long long time easy to generate carbon deposition under the influence of heat and oxygen. Therefore, in such conditions, lubricating oil should be used in narrow fractions of components, should choose a variety of mixed components of oil fractions.
19 compressor oil is modulated component containing a large amount of residue wide distillate made in the use of a large amount of soot in the compressor. Therefore, to improve the quality should be 19 compressor oil compressor oil components in the residue is removed, use a narrow-cut base oil.
3. To a suitable viscosity
In the hydrodynamic lubrication conditions, the oil film thickness increases with increasing oil viscosity increase, but increase friction in tandem with oil viscosity increases. Low viscosity lubricating oil is difficult to form a sufficiently strong film, it will accelerate wear and shorten the service life of parts. On the other hand, the lubricating oil viscosity is too high, it will increase internal friction, the ratio of the compressor power increases, so as to increase power and fuel consumption, but also in the piston ring groove on the valve, the exhaust passage, etc. form deposits. Therefore, choosing the right compressor oil viscosity is the correct selection of the most important issue. Xi'an Jiaotong University proved by experiment: the use of the same test conditions on the same type of compressor, the use of lower viscosity grades of oil than the use of high viscosity grades of oil up to reduce the ratio of the compressor power is about 10%, while parts but no significant difference in the amount of wear. Therefore, to ensure the lubrication of the premise, select the appropriate viscosity grade oil for energy-efficient and reliable operation of the compressor has a very important impact.
4. The viscosity-temperature performance is better
Injection internally cooled rotary air compressor is heated and cooled repeatedly in the course of their work. Therefore, the required oil viscosity due to temperature changes should not change too much, should have good viscosity-temperature performance. Compressor oil viscosity index of 90 or more are refined.
5. flash point should be appropriate
Flash point means the vapor pressure of the oil is heated at atmospheric pressure formed, reaches a temperature open flame ignited when the limit concentration. Flash point is too high, on heavy oil fraction, the viscosity is also large, asphaltenes and other content is high, easy to coke use. If the one-sided pursuit of high flash point of compressor oil, it will become unsafe. Therefore, the flash point of the compressor oil can claim appropriate.
Flash Point is just one of safety indicators used in the oil, compressor oil flash point controls are generally safe to use in more than 200 ℃
6. coke smaller tendentious
Compressor oil resistance to carbon deposition tendency how reliable operation of the compressor oil is essential. In actual industrial use, medium-sized compressor accident occurred due to carbon deposition fire explosion is common.
The main substance in the oil easy to form carbon residue is asphaltene, resin composite materials and polycyclic aromatic hydrocarbons. After lubricating material can be refined to remove most of the above substances. Lubricants generally low viscosity and highly refined low carbon residue, easy to use in coke. Therefore, high-quality L-DAB compressor oil should be used highly refined residue-free (light oil) narrow distillate base oil. Additives should also try to use ash-free additives.