The working principle of vacuum pump oil
Release time:
2021-11-09
In the vacuum pump, the vacuum pump oil is not only used as the medium to obtain the vacuum, but also plays the role of lubricating, cooling and sealing the mechanical friction point.
1. Very low vapor pressure
This is the most important performance of the vacuum pump oil, because the vacuum pump requires a high degree of vacuum, the general use of paraffin-based narrow fraction lubricating oil, for the diffusion vacuum pump, but also the use of low vapor pressure silicone oil or other synthetic oil.
2. Suitable viscosity and good viscosity-temperature characteristics
The volume of the vacuum pump cavity is constantly changing to form an exhaust effect, which requires that the lubricating oil should have appropriate viscosity and viscosity-temperature characteristics.
3. Good thermal oxidation stability
Vacuum pumps continue to develop at high speeds. Due to the high-speed friction between the sliding vane and the pump body, the oil temperature rises, and the oil is easily oxidized and decomposed. In particular, the diffusion pump often works in a very high temperature environment, which increases the vapor pressure in the system. The vacuum degree is reduced, so the vacuum pump oil is required to have good thermal oxidation stability.
4. Good corrosion resistance and anti-emulsification
If the vacuum pump is inhaled by corrosive gas, it will chemically react with the oil and corrode the internal parts of the pump; the inhaled air often contains water vapor condensate, which causes the emulsification of the vacuum pump oil and causes metal corrosion, so it is required to have good corrosion resistance and Anti-emulsification.
5. Higher flash point
The main requirements of the vacuum pump do not carry light components, so as not to affect the saturated vapor pressure of the oil.
6. Lower limit pressure
The ultimate pressure is an important performance index of the vacuum pump oil to understand the ultimate pressure of the vacuum pump at the lowest vacuum limit pressure.
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