Vacuum pump oil viscosity selection principle
Mar 18, 2022| Vacuum pump oil viscosity selection principle
The selection of oil viscosity is one of the important factors of vacuum pump performance. The viscosity of a liquid is the resistance to the flow of the liquid or the internal friction of the liquid. The greater the viscosity, the greater the resistance of various parts moving speed, the higher the temperature rise, the greater the power loss; Viscosity is too small, the sealing performance of the pump deteriorates, causing gas leakage and vacuum deterioration. Therefore, all kinds of vacuum pumps are very important to the selection of oil viscosity, the principle of oil viscosity selection is:
1, the higher the speed of the pump, the lower the viscosity of the oil.
2. The greater the linear velocity of the rotor of the pump, the lower the viscosity of the selected oil.
3, the pump parts of the processing precision or friction between the gap between the smaller, the lower the viscosity of the choice of oil.
4. When a vacuum pump is used at high temperatures, the viscosity of oil should be selected.
5, cooling water circulation vacuum pump, generally choose lower viscosity oil is appropriate.
7, other types of vacuum pumps, according to their speed, processing accuracy, limit vacuum, etc., choose the corresponding oil.
Emulsification and carbonization of vacuum pump oil. Vacuum pump in the long-term use of the process of not often replaced and manual maintenance, vacuum pump oil will occur emulsification or carbonization phenomenon, resulting in vacuum pump cylinder wear, tubing blockage, oil filter blockage and a series of problems. If the oil mist separator is blocked, the gas pumped into the pump body will not be discharged easily. At this time, the internal pressure in the pump body is too high, and the pumping speed is reduced, leading to the decrease of vacuum degree. Therefore, the vacuum pump oil should be replaced in time.
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