Structural features of roots 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 rotor and the housing, no lubrication, small friction loss, which can greatly reduce the driving power, so as to achieve higher speed;

(3) There is no need to seal and lubricate with oil in the pump chamber, which can reduce the pollution of oil vapor to the vacuum system;

(4) There is no compression in the pump chamber and no exhaust valve. The structure is simple and compact, and it is not sensitive to dust and water vapor in the pumped gas;

(5) The compression ratio is low, and the pumping effect of hydrogen is poor;