Selection and use of vacuum pump

The function of the vacuum pump is to remove gas molecules from the vacuum chamber and reduce the gas pressure in the vacuum chamber to achieve the required vacuum. In general, there is a large range from atmospheric to very high vacuum, and so far no vacuum system has covered this range. Therefore, in order to achieve different product process specifications, work efficiency and equipment working life requirements, different vacuum sections need to choose different vacuum system configurations. For optimal configuration, the following points should be considered when selecting a vacuum system:

1. Determine the working vacuum range

It is first necessary to check the vacuum required to determine each process. Because each process has its own range of vacuum levels, it must be carefully studied.

2, determine the ultimate vacuum

The ultimate vacuum of the vacuum pump system is checked on the basis of determining the degree of vacuum required by the process, since the ultimate vacuum of the system determines the optimum working vacuum of the system. In general, the system's ultimate vacuum is 20% lower than the system's operating vacuum and 50% lower than the foreline's ultimate vacuum.

3. Types of gas to be pumped and pumping capacity

Check the type of pumping and the amount of pumping required to determine the process. Because if the type of gas being pumped reacts with the liquid in the pump, the pump system will be contaminated. At the same time, consideration must be given to determining the appropriate exhaust time and the amount of gas produced during the pumping process.

4, vacuum volume

Check the time required to reach the required vacuum, the flow resistance and leakage of the vacuum piping.

Consider the pumping rate required to maintain the vacuum under certain process requirements after achieving the required vacuum.

5, vacuum pump calculation formula

S=2.303V/tLog(P1/P2)

among them:

S is the vacuum pumping rate (L/s)

V is the vacuum chamber volume (L)

t is the time required to reach the required vacuum (s)

P1 is the initial vacuum (Torr)

P2 is the required vacuum (Torr)

E.g:

V=500L

t=30s

P1=760Torr

P2=50Torr

Then: S=2.303V/t Log(P1/P2)=2.303x500/30xLog(760/50)=35.4L/s

Of course, the above formula is only a theoretical calculation result, and a number of variable factors are not taken into consideration, such as pipe flow resistance, leakage, flow resistance of the filter, temperature of the gas to be pumped, and the like. In fact, the safety factor should also be taken into account.

The vacuum pump is a rotary variable-capacity vacuum pump. It must be equipped with a foreline pump. It can be used in a wide pressure range. The pumping speed is not sensitive to dust and water vapor in the extracted gas. It is widely used in metallurgy and chemical industry. , food, electronic coating and other industries.

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Label: Vacuum pump Selection Use

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