Commonly used pump vacuum degree and scope of application

Commonly used pump vacuum degree and scope of application

 In chemical design, the vacuum pump is one of the commonly used equipment. There are many kinds of vacuum pumps. How to select the vacuum pump is a problem to be solved in the design work. Understanding the vacuum degree and application range of commonly used vacuum pumps can be helpful to the selection of vacuum pumps in the design.

1. Liquid ring pump is a crude vacuum pump, the gas compression in liquid ring pump is isothermal, so it can be used to remove flammable and explosive gases. In addition, it can also be used to remove dust and water-containing gas. 

2. Rotary vane pump is an oil seal type mechanical vacuum pump which can start pumping directly from atmospheric pressure; Can be used as low vacuum pump alone, can also be combined with other high vacuum pumps as a front stage pump; Small size, lightweight and low noise, especially suitable for laboratory use; The pump can not be used to pump excessive oxygen, toxic, explosive or chemical with pump oil or corrosive effect on ferrous metal gas limit vacuum 1.3Pa

3. Rotary piston pump is a kind of mechanical vacuum pump oil seal type Commonly used on large vacuum equipment, high vacuum, low noise and less vibration, long life, is not easy to the characteristics of the oil spill, can be used to smoke with high temperature A slight dust and corrosive gas, especially the mixed gas containing a small amount of water vapor is divided into single-stage and two-stage two type single-stage pump limit pressure of small pump 0.6Pa, for the large pump 1.3Pa(all shut-off gas), the limit pressure of the two-stage pump 0.06Pa(shut-off gas) pumping speed is greater than 150L/s of the slide valve pump using single-stage type

 4. Roots pump is a variable volume vacuum pump is characterized by a fast start, less power consumption, low operation and maintenance costs, pumping speed, and high efficiency, to be pumped gas containing a small amount of water vapor and dust is not sensitive, in the range of 100 ~ 1Pa pressure has a large pumping rate, can quickly exclude the sudden release of gas, do not need oil lubrication; Speed up to 3450 ~ 4100r/min; Pumping rate of 30~ 10000L/s limit vacuum: single-stage pump 6.5 102Pa, double stage pump 1 103Pa

 5. Diffusion pump is a momentum transfer pump characteristic can obtain high vacuum, used for vacuum smelting coating space simulation experiment and the vacuum system is not sensitive to oil pollution limit vacuum is 10-4~ 10-5Pa

 6. Reciprocating pump is a variable volume vacuum pump, dry and wet gas pumping range is large, up to 15 ~ 5 500L/s, pumping efficiency is not high is not suitable for removing corrosive or containing small particles of gas, if the gas is pumped containing particles, the inlet must be installed filter single-stage pump limit vacuum is about 400 ~ 103Pa, the ultimate vacuum of the two-stage pump is about 1Pa

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