The vacuum drop of vacuum pump refers to that the vacuum degree of rotary vane vacuum pump measured at present is lower than that of factory index or previous application.

1. Different brands of vacuum pump oil, because the saturated vapor pressure in different brands of oil is not the same, so the consequences are different.

Treatment method: according to the model and specification of the product, change the accurate new vacuum pump oil.

2. The temperature of the extracted gas can be too high.

Treatment method: drop the temperature of the extracted gas, or add a corresponding heat exchanger.

3. The oil way in the pump is blocked or not smooth, and there is no certain amount of oil in the pump cavity.

Treatment method: check whether the oil circuit can be dredged, and add the same type of vacuum pump oil.

4. In addition, it is also because of the low vacuum formed by vacuum pump oil, that is, vacuum pump oil emulsification discoloration, maybe too dirty.

Treatment method: drain and clean all the vacuum pump oil in the pump, replace the same type of vacuum pump oil, and treat the extracted gas, water vapor and impurities do not enter the pump.

5. The clearance of fit is increased. This is because there are dust and so on in the temporarily aspirated body, and the gap between the rotor and the stator is increased after wear.

Treatment method: review whether the clearance is too large and replace with new parts.