Advantages and disadvantages of dry screw vacuum pump

The dry screw vacuum pump mainly uses a pair of screws, which is characterized by fine dynamic balance correction of the two screws, supported by bearings, installed in the pump housing, there is a certain gap between the screw and the screw, so that when the dry screw vacuum pump works, there is no friction between them, the operation is stable, the noise is low, the working cavity does not need lubricating oil, and the dry screw pump can pump out the large amount of oil When measuring water vapor and a small amount of dust, the limit vacuum is higher But the screw pump used in our country mainly depends on imports, and the price is very expensive Dry screw vacuum pump, which uses a pair of screws, in the pump shell for synchronous high-speed reverse rotation of the suction and exhaust effect of the pumping equipment Its advantages make up for the shortcomings of oil sealed vacuum pump, which we call the upgraded version of oil sealed vacuum pump But the cost of dry screw vacuum pump is also its shortcomings Next, it mainly introduces its advantages and disadvantages: 1 There is anti-corrosion coating on the surface of the working chamber and the screw rotor, which can adapt to the harsh working conditions; 2 The gas is not compressed in the pump, which is suitable to extract condensable gas; 3 It does not consume oil and has no leakage; 4 It has simple structure and convenient maintenance 5 The pumped gas is directly discharged from the pump body, without water pollution, environmental protection pressure, and gas recovery is more convenient The disadvantages of dry screw vacuum pump 1 Because of the difficulty of screw pump processing, the screw pump used in China mainly depends on imports, and the price is very expensive 2 It is not suitable to extract explosive gas 3 It is not suitable to extract the gas with too high oxygen content With the development of industry in our country, in the semiconductor industry, LCD and other process manufacturing, the requirements for clean vacuum environment are higher and higher, but the traditional oil vacuum pump has not been able to meet such requirements The screw type dry vacuum pump with its advantages of wide pumping speed range, simple and compact structure, no friction of pumping cavity components, long life, low energy consumption, no oil pollution and so on, has been paid more and more attention by manufacturing and application units, and plays an important role in the dry vacuum pump market In developed countries such as Europe, America and Japan, screw type dry vacuum pump has replaced traditional oil pump more and more in many fields.