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Selection of lubricating oil for screw air compressor
1. quality of lubricating oil base oil of air compressor: the base oil of compressor oil generally accounts for 95% of the finished oil
Above, the quality of the base oil is directly related to the quality level of the compressor oil. Therefore, screw type air compressor oil generally uses high-quality hydrotreating mineral oil or synthetic oil as the base oil.
2. oxidation stability of lubricating oil of screw air compressor
In the recycling of oil, oil products are constantly in contact with high temperature and high pressure oxygen in compressed air, and it is easy to be oxidized and metamorphosed to form various acids, glia, asphaltene and other substances, which make the color of oil products become deeper, acid value increases, viscosity increases and deposits appear, thus reducing the injection amount of oil, increasing the temperature of oil products and machines, and causing excessive wear. Therefore, screw air compressor oil must have excellent oxidation stability, so as to ensure the long-term safe use of oil.
3. tendency of carbon accumulation of lubricating oil of screw air compressor
The anti carbon tendency of compressor oil is very important for the reliable operation of compressor oil. The main substances that easily form residual carbon in oil are asphaltene, gum and polycyclic aromatic hydrocarbons. After deep refining, most of the above substances can be removed. Generally, the residual carbon value of lubricating oil with low viscosity and deep refining is low, and it is not easy to accumulate carbon in use. The carbon accumulation tendency of oil products is the comprehensive performance of various indexes, and there are many factors affecting them, among which, the additive should also be ash free additive as far as possible.
4. oil water separation of lubricating oil of screw air compressor
The compressor meets with the condensate in the air and is stirred violently in operation, which is easy to produce emulsification, which causes the oil and gas to be separated and the oil consumption increases. Because the oil is emulsified, the oil film is damaged and the wear is caused. Emulsified oil will promote dust, sand and sludge dispersion, affect the function of valve, increase friction, wear and oxidation. Therefore, high quality compressor oil has good anti emulsification performance and oil-water separation performance.
5. defoaming property of lubricating oil of screw air compressor
When the screw compressor oil is used in circulation, the circulation speed is fast, and the oil is in a state of intense mixing. When the compressor oil starts or depressurized, the oil in the oil pool is also bubbling easily. A large number of oil bubbles are poured into the oil and gas separator, which makes the resistance increase and fuel consumption increase, which will cause serious overloading, overheating and other abnormal phenomena. Therefore, the excellent rotary compressor oil must have excellent defoaming performance to ensure that the foam tendency of the oil product (i.e. foaming) is small and foam stability (i.e. defoaming) is good.
6. rust resistance and corrosion resistance of lubricating oil of screw air compressor
The material of oil cooling parts of compressor is copper or copper metal, which is easy to be corroded, which will cause oil to deteriorate and oxidize in early stage, and generate sludge. This requires that the oil products should have good corrosion resistance. The moisture in the air is easy to cool in the intermittent operation compressor, which is not good for lubrication and can cause corrosion. Therefore, compressor oil should have good anti rust effect.
Comprehensive analysis: choose screw oil, can not look at one or more indicators, then deny or affirm the quality of a certain oil, must synthesize the above multiple elements, choose the appropriate lubricating oil.
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admin@rothmancompressor.com