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In order to prevent the dust in the pump oil, pull the material with the pump oil into the pump chamber. For some processes, the pump should be running in the process of continuous filtration device. After the dust, impurities and polluted oil submerge into the bottom of the main tank, they flow into the auxiliary tank through the oil return pipe and are separated, precipitated, emulsified oil, water, dust and impurities are submerged in the bottom of the auxiliary tank and regularly discharged by the exhaust valve. It is filtered by the filter arranged in the upper part of the auxiliary fuel tank and then enters into the oil separation chamber through the oil inlet pipe to be supplied to the end cap and the pump cavity to work.
　　
　　 The filter inside the filter blocks mechanical contaminants as the oil passes, purifying the pump oil. A pressure gauge is often attached to the filter to show if the filter is clogged. When the pressure increases, the oil can not flow normally. That is clogged filter should be replaced or cleaned filter.
　　
Directly connected to the vacuum pump weekly check the amount of oil. Oil change intervals depend on operating conditions, generally due to poor oil lubrication, excessive oil breakdown, or too much contaminants that increase the pump's ultimate pressure and require a change of oil.
　　
When the drawn medium and oil discharged from the exhaust valve pass through the separate exhaust cap, the gas and a part of the steam are discharged from the exhaust port , the valve and the pump are interlocked, that is, when the pump is working, the valve is started, and the oil passage is opened and the inflation port is closed. When the pump is stopped, the valve oil port is closed and the inflation port is opened, and the atmosphere is inflated from the intake port into the pump chamber through the inlet pipe to destroy the vacuum in the pump chamber, so that the pump oil can not enter the pump chamber.
　　
â’ˆ kinematic viscosity
　　
According to iso benchmark 40cmm2 / s center value can be divided into vg46, vg68, vgl00, vg22, vg32, vgl50, vg220 a total of seven brands. Each pump oil grade is based on the type of pump, speed, pumping speed, sports clearance, the ultimate pressure and limit the total pressure conditions formulated (see table).
　　
2. Viscosity index
　　
Usually people think by experience that "sticky" the more "sticky" vacuum the better. In fact, not the case, "thin" and "sticky" is relatively visual and feel it, and no quantitative data. As measured at 40 ℃, only two oil viscosity values ​​?? the same words, when the oil cooled to room temperature, which "thinner" than "sticky" oil is good. Because "thin" oil viscosity index than "sticky" high. Viscous oil with temperature changes and viscosity changes are also large, that is, low viscosity index, viscosity index is a significant index of vacuum pump oil. Viscosity index high pump oil viscosity and temperature change between less. And the cold pump is easy to run, with significant savings in cost, especially in the summer, as the ambient temperature and pump oil temperature rise, the oil ultimate pressure to maintain good results.
　　
â’Š flash point
　　
Flash point is also a more important vacuum pump oil quality index. It is not only from the flammable safety performance considerations. But high flash point oil content is often less light components. Therefore, when the oil temperature rises, the light boiling oil molecules are not volatile, can effectively maintain the ultimate pressure.
　　
â’‹ anti-emulsification degree
　　
Vacuum pump in operation, the system of water and cold gas will be discharged into the pump oil, oil and water will form an emulsion, not only affect the life of the pump oil also makes the ultimate pressure worse. Especially for pharmaceutical, food, ceramics and other industrial applications in the vacuum drying process, the anti-emulsification performance of pump oil is more important. Good anti-emulsification Pump oil-water separation ability, water vapor and condensate gas through the town gas valve, part of the water vapor will be discharged. In addition, low viscosity pump oil anti-emulsifying capacity is better than high viscosity oil. Additive pump oil pump oil effect is more obvious than without.
　　
⒌ anti-foam
　　
In operation, the gas in the vacuum system will be continuously discharged through the sealed vacuum oil layer. The exhaust gas will generate a large amount of bubbles on the surface of the oil layer and overflow from the pump exhaust hole, resulting in oil loss and equipment pollution. Anti-foam anti-foam pump oil, anti-foam effect has significantly improved.
　　
â’ oxidation stability
　　
Natural mineral oil has its own inevitable loopholes, thermal oxidation resistance than synthetic oil, oil composition with thermal oxidation decomposition easily degraded, the ultimate pressure stability is poor, pumping speed also decreased with the use of time. However, the additive oxidation stability significantly improved compared with pure mineral oil, common pure mineral oil oxidation test method d943 for a few hundred hours, while d943 can be added to the additive on the 1500 hours. Shows that the service life has been increased.
　　
â’Ž saturated vapor pressure
　　
Saturated vapor pressure is one of the key index of vacuum pump oil. In a thermostatic closed vessel, when the vapor-liquid two-phase reaches a dynamic equilibrium, the vapor phase has the pressure to indicate the saturated vapor pressure. In the 80c temperature environment to reach at least 6.5 × 10 a zpa (due to the temperature rise of 20 ℃, full steam with about an order of magnitude down).
　　
â’ ultimate pressure and limit pressure
　　
Ultimate pressure: the Pirani meter or thermocouple vacuum gauge to measure the total pressure of the vacuum pump (gas). It is understood that foreign emphasis on full pressure test using the index. Good pump oil can be measured (1.5 × 10.kpa).
　　
Limit partial pressure: Mercury compression vacuum gauge (Wheat's meter) measured the pump limit air partial pressure, two-stage rotary vane pump partial pressure should be ≤ 6 × 10-5kpa. Limit pressure and limit pressure difference conditions are not greater than an order of magnitude. The greater the difference between the two, the vacuum pump oil contains more volatile components, the worse the nature of the oil.
Replace the vacuum pump oil methods and physical and chemical indicators
    Direct vacuum pump oil is a vacuum pump developed specifically for the vacuum equipment and lubricants, mineral oil and synthetic oil in two. Vacuum pump oil in use, due to oxidation, emulsification and the outside world mixed with various impurities and other reasons, some of the oil deterioration, metamorphism and impurities to a certain extent, the oil color changes, the viscosity and acid value increased, Precipitation of insoluble resin-like substances, resulting in the vacuum pump oil vapor pressure increased performance deterioration. Pump oil can not be used at this time, you must replace the new pump oil.