Vacuum pump is a kind of revolving variable capacity. It needs the cooperation of the front pump to use in a wide pressure range with a larger pumping speed. It is insensitive to dust and steam contained in the extracted gas. It is widely used in metallurgy, chemical industry, food, electronic coating and other industries.



Characteristic:



(1) There is a large pumping speed in a wide pressure range.



(2) The rotor has good geometric symmetry, so it has small vibration and smooth operation. There are clearances between the rotors and between the rotors and the housing. Without lubrication, the friction loss is small, which can greatly reduce the driving power and achieve higher speed.



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



(4) There is no compression and exhaust valve in the pump chamber. Its structure is simple and compact, and it is insensitive to dust and water vapor in the exhausted gas.



(5) Compression ratio is low and the effect of hydrogen extraction is poor.



(6) The surface of the rotor is a curved cylindrical surface with complex shape, so it is difficult to process and inspect.