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　　The earliest history of cleanliness has been used in the aerospace industry, which can also be represented by the symbol SA. The cleanliness of mechanical and electrical instruments is a very important quality index. Cleanliness refers to the amount of dirt left on the surface of parts or products after cleaning. Generally speaking, the amount of dirt includes the type, shape, size, quantity, weight and other indicators; the specific indicators depend on the impact of different dirt on product quality and the requirements of cleanliness control accuracy

　　1. Ensure the cleanness of lubricating oil

　　Theoretically, if there is no impurity particles, the bearing can be used continuously for a long time and infinite life under the condition of less than fatigue load. However, it is very difficult to improve the cleaning level of lubricating oil to a state where these tiny particles do not exist at all. However, through online purification, the cleanliness of the oil can be improved to less than 0.001% (nas4 grade) of "mechanical impurity" in operation, which is simple, easy and low-cost.

　　2. Completely solve the old and difficult problems such as oxidation and deterioration of lubricating oil

　　The traditional oil filter can only filter the impurities above 5 μ m at most, and can't remove the colloidal impurities and saponification caused by emulsification and oxidation. Online purification can effectively remove the water mixed in the oil, the particle impurities below 5 μ m, corrosive salts and the colloid and saponification formed due to oxidation and metamorphism at the same time, and completely solve the old and difficult problems such as oxidation and metamorphism of lubricating oil, which is a new breakthrough in technology, especially the removal of gum, which cannot be solved by other oil filtering technologies at present.

　　3. It extends the service life of lubricating oil, improves the utilization rate of resources, and effectively protects the environmental metal particles which have a strong catalytic effect on the oxidation and metamorphism of oil. Under the synergistic effect of water, harmful substances react with oil to accelerate the oxidation and metamorphism of oil. On line purification can remove all kinds of impurities in the oil in time, so that the service life of the oil can be extended for more than ten years, which greatly reduces the discharge of waste oil, and greatly improves the environment and cost-effectiveness.

　　4. There is no need to shut down for oil change, which reduces the shutdown loss and greatly improves the utilization rate of the equipment

　　The continuous on-line purification can reduce the sedimentation pollution in the oil pipeline and the unit to zero. Even if the lubricating oil is polluted suddenly, there is no need to stop and change the oil. The faults caused by lubricating oil pollution are also greatly reduced, and the corresponding vulnerable parts, maintenance hours and maintenance costs are greatly reduced, thus greatly improving the economic benefits.

　　5. Change the passive handling of lubrication faults into active prevention of faults, improving the overall maintenance quality

　　①. Compared with the effect of traditional filtration equipment, there are mainly the following kinds of filtration equipment in China: plate and frame oil filter, filter element oil filter, centrifugal oil filter and vacuum oil filter. The plate and frame type and filter element type oil filters have been basically eliminated due to large consumables and oil loss, and are only used in very few occasions. Centrifugal oil filter is the first choice equipment for on-line purification in foreign countries. It is used to remove water and mechanical impurities. However, when a large amount of water enters in a moment, there is no specific gravity difference between oil and water, and the function of oil-water separation is lost. Moreover, the centrifugal oil filter can not get rid of colloid, and its expensive price often makes people flinch. The vacuum oil filter uses different saturated vapor pressure of different media to remove water and light component impurities through flash evaporation technology, which has good effect of purifying micro water, and can not be removed in time when entering a large amount of water in an instant. If the oil with corrosive impurities is purified, it is easy to cause leakage of valves and seals, so the failure rate is high and the adaptability is not good.

　　② principle of on-line purification: the design idea of kidney type oil filter of lubricating oil is based on bionics. The principle thinks that the principle that human blood can be used without replacement in a lifetime depends on the purification of kidney. If the lubricating oil of the equipment is also treated as "blood" and purified with twice the margin every day, the lubricating oil can also be used for a lifetime without replacement. The Coulomb force of non mechanical force is used as the purification method in the kidney type oil filter of lubricating oil. The different dielectric constant ε of oil, water, colloidal impurity and mechanical impurity is used to adsorb the precipitated impurity particles on the dielectric filter material. Under the effect of Coulomb force, the precipitated impurity particles can also be like iron filings in the magnetic field to attract and precipitate other impurity particles. A cylindrical dielectric placed in a gradient electric field, when a certain intensity of electric field is applied, the power line bends around the dielectric body, and a very strong high gradient electric field is formed at the distance of the diameter of the dielectric body. When the impurity particles move to the vicinity of the dielectric body with the oil flow, that is to say, they quickly swim in the direction of the field strength, and are adsorbed and precipitated on its surface. The separation principle is independent of the size of the pollutant, and is related to the separated substance The dielectric constant of the body is related to ε.

　　6. Application scope of online oil filter:

　　The on-line oil filter is applicable to the on-line purification of lubricating oil, hydraulic oil and turbine oil of large-scale hydraulic and thermal power generating units, large processing centers, mine lubrication stations, thin oil stations, refining and chemical combined and steam electricity combined large-scale combined units. The off-line purification for removing mechanical impurities, water and gum impurities before using diesel, kerosene and washing oil. The regeneration of waste oil and the preparation of high purity chemical agents.