The important measures for the safe and stable operation of the compressor are selected accurately. Therefore, when selecting the special smooth oil for the compressor, the quality of the smooth oil for the compressor should be considered together with the operation load, movement speed, operation temperature, smooth method and operation environment.
1. Quality of smooth oil base oil of air compressor
The base oil of compressor oil generally accounts for more than 95% of the product oil, so the quality of the base oil is directly related to the quality level of compressor oil, and the quality of the base oil is directly related to the refining depth.
The content of heavy aromatics and gum in the refined base oil is less, the carbon residue is low, and the sensitivity of antioxidant is good. Base oil has a great influence on the function of rotary compressor oil, so screw compressor oil generally uses high-quality hydrogenated mineral oil or synthetic oil as base oil.
2. Oxidation stability of smooth oil of energy saving air compressor
During the circulation of oil products, they are in constant contact with the high temperature and high pressure oxygen in the compressed air, which is easy to be oxidized and metamorphosed to produce various acids, resins, asphaltenes and other substances, so that the color of oil products becomes darker, the acid value increases, the viscosity increases and sediment appears, and then the injection amount of oil is reduced, so that the temperature of oil products and machines increases and excessive wear occurs. Therefore, it is necessary for screw air compressor oil to have excellent oxidation stability to ensure long-term safe use of oil.
3. Carbon deposit tendency of smooth oil in energy saving air compressor
The anti coking tendency of compressor oil is very important for the reliable operation of compressor oil. Asphaltene, gum and polycyclic aromatic hydrocarbon (PAH) are the most important carbon residues in oil products. Most of the above substances can be removed after deep refining of smooth oil. Generally, the carbon residue value of low viscosity and deep refined smooth oil is low, so it is not easy to deposit carbon in application. The function of the tendency of carbon deposition of oil products is a comprehensive reflection of various objectives, with many factors affecting it. In addition, the additive should also be ash free.
4. Oil water separation of smooth oil of energy-saving air compressor
In operation, the compressor constantly meets the condensed water in the air and is violently mixed, which is prone to emulsification, resulting in unclear separation of oil and gas and increased oil consumption. Because the oil is emulsified, the oil film is destroyed, which constitutes wear. Emulsified oil will promote the dispersion of dust, grit and sludge, affect the function of the valve, add conflict, wear and oxidation. Therefore, high-quality compressor oil has good anti emulsification function and oil-water separation function.
5. Defoaming property of smooth oil of energy-saving air compressor
In the process of recycling, the screw compressor oil has a fast circulation speed, and the oil is in a state of intense mixing. When the engine oil is started or relieved, the oil in the oil pool is also bubbling easily. Many oil bubbles are injected into the oil-gas separator to increase the resistance. The addition of fuel consumption will cause abnormal phenomena such as severe overload and over temperature. Therefore, excellent rotary compression oil is necessary to have excellent defoaming function to ensure that the foam tendency of the oil product (i.e. foaming) is small and foam stability is good.
6. Rust and corrosion resistance of smooth oil of energy-saving air compressor
The raw material of oil cooling and other parts of the compressor is copper or copper metal, which is easy to be corroded and will cause the oil to show oxidation and deterioration in the early stage, resulting in oil sludge. This requires that oil products should have outstanding anti-corrosion ability. The moisture in the air is easy to be cooled in the compressor operated intermittently, which is smooth, dull and rusty. Therefore, the compressor oil is required to have outstanding anti rust effect.
7. Base oil fraction of smooth oil of energy saving air compressor
The composition of base oil is the key factor to judge the quality of air compressor oil. After the compressor oil is injected into the cylinder of the compressor, the light components leave the working position early because of strong volatility, and then affect the smooth effect, while the heavy components remain in the working position after the completion of the task because of poor volatility, and carbon deposits are easily generated in the effect of heat and oxygen overnight, which affects the function of the compressor. Therefore, the component oil with narrow fraction should be selected for the smooth oil, and the component oil mixed with multiple fractions should not be selected.
8. Viscosity of smooth oil of energy-saving air compressor
Under the condition of dynamic smoothness, the oil film thickness increases with the viscosity of base oil, but the conflict force also increases with the viscosity of base oil. The smooth oil with low viscosity is not easy to form enough strong oil film, which will speed up the wear of air compressor, and then lead to short air compression and short service life of moving parts. On the contrary, the smooth oil of air compressor with high viscosity will increase the internal conflict force, increase the loss power of the compressor, lead to the addition of oil consumption (energy consumption) of air compressor, and also form deposits at piston rings, air valves, exhaust channels, etc.
Therefore, the selection of suitable viscosity air compressor oil is also to be seriously considered. Scientific verification has shown that: using the same test conditions on the same type of compressor, using the oil with lower viscosity can reduce the loss power of the compressor by about 10% at most than using the oil with higher viscosity, but there is no significant difference in the wear amount of components. Therefore, on the premise of ensuring smoothness, selecting oil products suitable for viscosity trademark has a very important impact on energy saving and reliable operation of air compressor.
9. Flash point of smooth oil of energy-saving air compressor
Flash point refers to the temperature when the vapor pressure formed by heating oil under atmospheric pressure reaches the lower limit concentration ignited by an open fire. If the flash point of air compressor oil is too high, the distillate weight and viscosity of oil will be high, and the content of impurities such as asphalt will be high, so it is easy to form carbon deposit when using. If only seeking the high flash point of tightening oil, it will become an unsafe element of air compressor. Therefore, the flash point of tightening oil is required to be moderate, generally controlled above 200 ℃.
10. Copper or copper metal are used as raw materials for anticorrosion of smooth oil of energy-saving air compressor and oil cooling of antirust compactor, which are easy to be corroded and will cause the oil to show early oxidation change and deterioration, resulting in oil sludge. This requires that oil products should have outstanding anti-corrosion ability. The moisture in the air is easy to be cooled in the cylinder of the compressor operated intermittently, which is smooth and dull and can cause wear and corrosion. It is required that the compressor oil should have outstanding anti rust effect.
11. Consider the working load of energy-saving air compressor
Working load is directly accepted by bearing (or conflict pair) from static load and dynamic load, which should be fully considered when selecting smooth oil. Under the condition of liquid smoothness, the higher the viscosity of smooth oil is, the greater its load capacity will be; when the gap is smooth, the viscosity has little effect on improving the smoothness, and its oil property and anti extreme pressure function are indispensable. At this moment, the smooth oil with better anti extreme pressure function should be selected; for the occasion of impact load, reciprocating movement or difficult oil film formation, the smooth grease or solid smooth agent should be selected as Appropriate. The bearing of centrifugal compressor is generally radial load bearing.
12. Consider the movement speed of energy-saving air compressor
The relative motion speed is an important parameter of bearing (or conflict pair) structure design, and it is also the consideration factor of smooth oil selection. Generally, the bearing with low relative motion speed is suitable for selecting the smooth oil with high viscosity to facilitate the composition and maintenance of oil film; generally, the centrifugal compressor has high rotation speed, some of which are over 10000r / min, so the smooth oil with low viscosity should be selected.
13. Consider the operating temperature of energy-saving air compressor
Operating temperature refers to the ambient temperature at which the bearing works and the temperature that has an impact on it. If the ambient temperature is low, the smooth oil with low viscosity and low freezing point shall be selected; if the ambient temperature is high, the smooth oil with high viscosity and high flash point shall be selected; if the ambient temperature at which the bearing works changes greatly, the smooth oil with good viscosity and high viscosity index shall be selected. Smooth oil. In general, when selecting smooth oil products, it is necessary to make the matching reasonable and reliable according to the temperature of bearing operation environment.
14. Consider energy saving air compressor smoothing method
The smooth oil with good adhesion and high viscosity shall be selected for the smooth or easily lost parts of the interstitial oil filling; the continuous and forced smooth oil shall be generally used for the centrifugal compressor, so the smooth oil with small relative viscosity, good anti-oxidation stability, rust prevention, anti foam and smooth function shall be selected.
15. Consider the operation environment of energy-saving air compressor
For example, the tightening medium of the compressor has special requirements for the smooth oil, and the corresponding smooth oil of air compressor with the function of resistance to the medium should also be selected, such as the ammonia resistant smooth oil for the ammonia compressor. In addition, the smooth oil recommended by the equipment manufacturer shall also be referred to in oil selection. To sum up, when selecting smooth oil products, first, consider the operation and environmental conditions of the equipment to meet the needs of equipment operation; second, try to reduce the variety of smooth oil products to facilitate the management of smooth oil products.