Features of vacuum pumps

(1) There is a large pumping speed in a wide pressure range;
(2) The rotor has good geometric symmetry, so the vibration is small and the operation is stable. There are gaps between the rotors and between the rotors and the housing, no lubrication, small friction loss, which can greatly reduce the driving power, so that higher speed can be achieved;
(3) There is no need to seal and lubricate with oil in the pump cavity, which can reduce the pollution of oil vapor to the vacuum system;
(4) There is no compression in the pump cavity and no exhaust valve. Simple and compact structure, insensitive to dust and water vapor in the pumped gas;
(5) The compression is relatively low, and the effect on hydrogen pumping is poor;
(6) The rotor surface is a curved cylinder with a complex shape, which is difficult to process and check.