The principle is to use an eccentric rotor to form a volume change in the pump cavity through rotation to discharge the gas out of the pump. The main reason is that during the suction process, the volume of the suction cavity increases, the vacuum degree decreases, and the gas in the container is sucked into the pump cavity. In the exhaust process, the volume becomes smaller and the pressure increases, and finally the sucked gas is discharged out of the pump through the oil seal.

Before normal operation, the vacuum pump should be tested for a trial run to check whether the vacuum pump has abnormal vibration and impact noise. For the vacuum pump used for the first time, the ultimate pressure of the vacuum pump should also be measured, which should meet the technical specifications. Under long-term working conditions, the temperature of the vacuum pump should not exceed 70 degrees. As for the determination of pumping speed, it is generally not checked due to its complexity.

A mechanical vacuum pump that requires cooling water. The cooling water should be passed before starting, and then start. The outlet temperature of the cooling water should not exceed 30 degrees.