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Many users may ask this question: can oil be used in rotary vane vacuum pump? The answer is No. So why does rotary vane vacuum pump use the specified lubricating oil?

Some users of rotary vane vacuum pump use ordinary engine oil instead of special oil for vacuum pump in order to save cost. In fact, this not only increases the use and maintenance cost of vacuum pump, but also seriously affects the service life of vacuum pump. This chapter mainly describes why special oil for vacuum pump should be selected for rotary vane vacuum pump.

1. The special oil for vacuum pump has a certain viscosity, which determines the sealing performance of the vacuum pump. If the viscosity is too small, the sealing performance is not good. If the viscosity is too high, the friction between the blade and the cylinder block will be increased, and the lubrication effect will be poor. At the same time, the rotation of the rotor will be difficult, the pressure of the motor will be higher, and the oil temperature will be higher and higher. The increase of oil temperature will accelerate the emulsification degree of pump oil and affect the vacuum degree.

2. The chemical properties of vacuum pump special oil tend to be more stable, and the content of water, water-soluble acid, insoluble alkali and other impurities are much smaller. The use of special oil can avoid the problem of replacing vacuum pump oil for many times and ensuring the cleanliness of the pump.

3. The saturated vapor pressure of vacuum pump special oil should be low and the volatile light fraction should be less. If it is the ordinary vacuum pump oil or oil is easy to volatilize, the use of non vacuum pump oil will face the situation of frequent refueling.

It can be seen from the above points that the use of regular special oil for vacuum pump can effectively prevent the emulsification and carbonization of pump oil, which can fundamentally solve the difficulty of vacuum pump maintenance and improve the service life of vacuum pump.

In addition, during the process of using the vacuum pump, the use of special oil for vacuum pump should be checked frequently. The emulsification, carbonization, inclusion of non impurity or unknown liquid and the sudden increase of vacuum pump oil must be replaced as soon as possible. At the same time, it must be confirmed that it is the same type of special oil for vacuum pump, so as to ensure the normal use of vacuum pump.