What kind of vacuum pump is used in the vacuum system?

with what kind of vacuum pump, vacuum system, first of all, should according to the requirement of the system, the second to have a detailed understanding of the pump performance characteristics, compares the advantages and disadvantages of various kinds of pump, and then make a decision, so as to choose appropriate. For ease of selection of vacuum water pump is used, is now China's production of various types of vacuum pump the general situation of induction to summarize, a brief compare their features and advantages and disadvantages, appears to be necessary. A, oil seal, mechanical pump is the production of 2 x are two stage rotary vane pump, pumping speed of 0. 5 ~ 150 liters per second, with a full range of products. Plunger pump single stage ( H) And two stage ( 2 h) 。 The pumping speed: H for 8 ~ 600 litres per second; 2 h is 8 ~ 70 liters per second. Also has series products. Yu cycloidal pump pumping speed can be very big, small volume, is now on trial production. This kind of pump is used to get the low vacuum, before making a high vacuum pump or water pump and drainage pump. With a gas ballast device I can smoke in addition to damp empty. But the ultimate vacuum than dry air ( Don't have to town) The low - An order of magnitude. The pumping speed refers to the inlet pressure of the pump in 760 when the pumping speed, when the system pressure drop pumping speed also fell, until close to the limit of vacuum pump, pumping speed is close to zero. The pump pressure coefficient has certain rules. Second, the mechanical booster pump ( Roots pump) Working pressure range, 10 ~ 5 x10 4, the commonly used range, 2 ~ 5 x10 3, pumping speed range of 150 ~ 2000 liters per second, our country has successful series products. The biggest pump pumping speed in 2 ~ 10 - 2 between, need backing pump, not directly to the air vent. Ultimate vacuum change with backing pump. Compared with the oil pump, wide working pressure, the maximum exhaust pressure is higher, Oil pump 10 ~ 30, booster pump 1 ~ 2) , rarely reflux oil steam, steam ejector with it contains water and non-condensable gas when more appropriate. Three, oil pump working pressure range of 1 ~ 1 x10 4, commonly used in the range is 0. x10 - 1 ~ 1 2, pumping speed range 200 ~ 40000 liters per second, makes up for the mechanical pump, diffusion pump in the pressure range of pumping speed of small defects. Of inert gas and other gases have the same pumping speed. Four, oil diffusion pump oil diffusion pump working pressure range of 10 - 2 ~ 5 x10 - 7, 10 - common range ~ 5 8 x10 - 6, pumping speed range from 20 to 100000 liters per second, metal, glass structure of diffusion pump into series production. Ultra high vacuum oil diffusion pump pressure limit is about 10 - 10, in addition to the structure and the ordinary oil diffusion pump is slightly a little difference, mainly operating fluid is different, different structural material, which USES 275 silicone fluid, such as pump structure material with stainless steel. New design of ultra high vacuum water pump difference is bigger.

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