Vacuum pump oil viscosity selection principle
Mar 23, 2021| Vacuum pump oil viscosity selection principle
The choice of oil viscosity is one of the important factors of vacuum pump performance. The viscosity of a liquid is the resistance of the liquid to flow or the internal friction of the liquid. The greater the viscosity, the greater the resistance of the movement speed of various components, the higher the temperature rise, the greater the power loss; Viscosity is too small, the sealing performance of the pump becomes worse, causing gas leakage and vacuum deterioration. Therefore, the choice of oil viscosity of all kinds of vacuum pumps is very important. 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 rotor velocity of the pump, the lower the viscosity of the oil.
3, the processing precision of the pump parts or the clearance between the friction parts is smaller, the lower the viscosity of the choice of oil.
4. When a vacuum pump is used in high-temperature conditions, it is advisable to choose the viscosity of the oil.
5, the vacuum pump with cooling water circulation, generally chooses the oil with lower viscosity is appropriate.
7, other types of vacuum pumps, according to their speed, processing accuracy, limit vacuum, etc., choose the corresponding oil.
Emulsion and carbonization of vacuum pump oil. If the vacuum pump is not often replaced and maintained manually during long-term use, the oil of the vacuum pump will be emulsified or carbonized, which leads to a series of problems such as vacuum pump cylinder wear, tubing clogging, oil filter clogging, and so on. If the oil mist separator is blocked, the gas pumped into the pump body will not be easy to discharge. At this time, the pressure in the pump body is too high, the pumping speed decreases, leading to the decrease of vacuum degree. Therefore, the vacuum pump oil should be replaced in time.
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