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, The ultimate pressure of the vacuum pump should meet the working pressure of the process. The ultimate pressure of the pump is usually chosen to be about an order of magnitude lower than the process requirements.
2. Each pump has a certain working pressure range. Therefore, the working point of the pump should be selected within this range, and it cannot be allowed to work for a long time outside the allowable working pressure.
3. Under its pressure, the vacuum pump should be able to discharge all the gas generated in the process of the vacuum equipment.
4. Select the vacuum unit:
(1) When using one type of pump cannot meet the requirements of pumping and vacuum, several pumps need to be combined to complement each other to meet the process requirements.
(2) Some vacuum pumps cannot work under atmospheric pressure and require pre-vacuum; some vacuum pumps have outlet pressure lower than atmospheric pressure and require a fore pump, so they all need to be used in combination. The vacuum pump used in combination is called a vacuum pump unit, which can make the vacuum system obtain better vacuum degree and exhaust volume. We should choose the combined vacuum pump correctly, because different vacuum pumps have different requirements for the gas to be pumped out, for example: in general, the Roots-rotary vane unit is not used in systems containing more condensable gases.
5. When you choose an oil-sealed pump, you should first understand whether your vacuum system has requirements for oil pollution. If the equipment is strictly required to be oil-free, various oil-free pumps should be selected, such as: water ring pumps, cryogenic pumps, etc. If the requirements are not strict, an oil pump and some anti-oil pollution measures, such as cooling wells, oil blocking wells, baffles, etc., can also meet the clean vacuum requirements.
6. Understand the composition of the pumped gas, whether the gas contains condensable steam, whether there is particle dust, whether it is corrosive, etc. When choosing a vacuum pump, you need to know the gas composition and select the corresponding pump for the gas to be pumped. If the gas contains neat, particulate and corrosive gases, it should be considered to install auxiliary equipment such as condensers, dust collectors, etc. on the inlet pipeline of the pump.
7. When choosing an oil-sealed vacuum pump, it is necessary to consider how the oil vapor (soot) discharged from the vacuum pump has an impact on the environment. If the environment does not allow pollution, you should choose an oil-free vacuum pump, or discharge the oil vapor to the outside.
8. Whether the vibration generated by the vacuum pump has any effect on the process and the environment. If the process does not allow, choose a pump without vibration or choose anti-vibration measures.
9. The price, operation and maintenance cost of the vacuum pump.
After we have considered various situations, we can then determine a solution that is suitable for you:
(1) Small investment costs.
(2) Small production and operation costs.
(3) Consider the first two situations comprehensively.