How Does Vacuum Pump Oil Affect Vacuum Degree?

Which parameters of vacuum pump oil directly affect vacuum degree?


The quality of the vacuum pump oil depends on the viscosity and vacuum degree, and the vacuum degree depends on the value at different temperatures. The higher the temperature, the more stable the performance of the vacuum degree is, which is a good oil.


Recommended Vacuum Pump Oil Viscosity Range

  1. The piston vacuum pump (W type) can use ordinary oil, and oil with V100 and V150 viscosity grade oil.

  2. The rotary vane vacuum pump (2X type) uses V68 and V100 viscosity grade oil.

  3. The direct-connected (high-speed) rotary vane vacuum pump (2XZtype) uses V46 and V68 viscosity grade oil.

  4. The rotary piston vacuum pump (H type) uses V68, V100 viscosity grade oil.

  5. The trochoidal vacuum pump (YZ, YZR type) uses V100, V150 viscosity grade oil.

  6. For roots vacuum pump (mechanical booster pump), V32 and V46 vacuum pump oil can be selected.


Vacuum Pump Oil Viscosity Selection

The vacuum pump oil viscosity is one of the important factors in vacuum pump performance. The liquid viscosity is the resistance of the liquid to flow, or the internal friction of the liquid. The greater the viscosity, the greater the resistance to the moving speed of various components, the higher the temperature rise, and the greater the power loss. If the viscosity is too small, the sealing performance of the pump will deteriorate, causing gas leakage and vacuum deterioration.

Therefore, the oil viscosity selection for various types of vacuum pumps is extremely important. The principle of oil viscosity selection is:

  1. The higher the speed of the pump, the lower the viscosity of the oil selected.

  2. The greater the linear speed of the rotor movement of the pump, the lower the viscosity of the oil selected.

  3. The finer the machining accuracy of the pump parts or the smaller the gap between the friction parts, the lower the viscosity of the selected oil.

  4. When the vacuum pump is used in high temperature conditions, it is advisable to choose higher oil

  5. For vacuum pumps with cooling water circulation, oil with lower viscosity is generally suitable.

  6. For other types of vacuum pumps, the corresponding oil products can be selected according to their rotational speed, machining accuracy, ultimate vacuum, etc.  


Vacuum Pump Oil Emulsification and Carbonization

If the vacuum pump is not frequently replaced and maintained manually during the long-term use, the vacuum pump oil will be emulsified or carbonized, which will lead to a series of problems such as vacuum pump cylinder wearing, oil pipe blockage, and oil filter blockage.

If the oil mist separator is blocked, the gas pumped into the pump body will not be easily discharged. At this time, the internal pressure of the pump body is too high, the pumping speed is reduced, and the vacuum degree is reduced. Therefore, the vacuum pump oil should be replaced in time.


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