What are the requirements for the oil used in the vacuum pump?
Jun 01, 2019| What are the requirements for the oil used in the vacuum pump? Today's Xiaobian is briefly introduced below.
1.Very low vapor pressure
This is the most important performance of vacuum pump oil. Because vacuum pump requires high vacuum, paraffin-based narrow-cut lubricating oil is generally used. For diffusion vacuum pump, silicone oil or other synthetic oil with low vapor pressure can be used.
2. Suitable viscosity and good viscosity-temperature characteristics
The internal volume of the vacuum pump chamber is constantly changing to form an exhausting action, and the lubricating oil should have suitable viscosity and viscosity-temperature characteristics.
3. Good thermal oxidation stability
The vacuum pump is continuously developing at a high speed. Due to the high-speed friction between the sliding piece and the pump body, the oil temperature is increased, and the oil is easily oxidized and decomposed. In particular, the diffusion pump is often operated under a high temperature environment, so that the vapor pressure in the system rises. The degree of vacuum is lowered, so the vacuum pump oil is required to have good thermal oxidation stability.
4. Good corrosion resistance and demulsibility
If the vacuum pump draws in corrosive gas, it will chemically react with the oil and corrode the parts inside the pump. The inhaled air often contains water vapor condensate, which causes the vacuum pump oil to emulsifie and corrode the metal. Therefore, it is required to have good corrosion resistance and emulsification resistance. Sex.
5. Higher flash point
It is mainly required that the vacuum pump does not carry light components, so as not to affect the saturated vapor pressure of the oil.