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Key Points for Selecting a Vacuum Pump
Release time:
2021-01-12 11:52
1. The ultimate pressure of the vacuum pump should meet the working pressure of the process. Typically, the ultimate pressure of the pump is chosen to be about an order of magnitude lower than the process requirements; 2. Each type of pump has a certain working pressure range; ...
1. Core Tips for Vacuum Pump Selection
1. The ultimate pressure of the vacuum pump should meet the working pressure of the process. Typically, the selected pump's ultimate pressure is about one order of magnitude lower than the process requirements.
2. Each type of pump has a certain working pressure range.
2. Key Points for Vacuum Pump Selection:
1. The ultimate pressure of the vacuum pump should meet the working pressure of the process. Typically, the selected pump's ultimate pressure is about one order of magnitude lower than the process requirements.
2. Each type of pump has a certain working pressure range, therefore, the working point of the pump should be selected within this range, and it should not operate outside the allowable working pressure for extended periods.
3. The vacuum pump should be able to exhaust all the gas generated during the vacuum equipment process at its working pressure.
Maglev Molecular Pump
4. Selecting a Vacuum Unit:
(1) When a single pump cannot meet the pumping and vacuum requirements, several pumps need to be combined to complement each other to meet the process requirements.
(2) Some vacuum pumps cannot operate at atmospheric pressure and require pre-vacuum; some vacuum pumps have outlet pressures lower than atmospheric pressure and require a backing pump, so they need to be used in combination. The combined vacuum pumps are referred to as vacuum pump units, which can achieve better vacuum levels and exhaust volumes for the vacuum system. We should correctly select the combined vacuum pumps, as different vacuum pumps have different requirements for the gases being pumped. For example, in general, a Roots-rotary vane unit is not suitable for systems containing a large amount of condensable gases.
Molecular Pump Unit
5. When selecting an oil-sealed pump, you should first understand whether your vacuum system has requirements for oil contamination. If the equipment strictly requires oil-free operation, various oil-free pumps should be selected, such as water ring pumps, cryogenic pumps, etc. If the requirements are not strict, oil-sealed pumps can be chosen along with some anti-oil contamination measures, such as adding cold traps, oil traps, baffles, etc., to achieve clean vacuum requirements.
6. Understand the composition of the gas being pumped, whether it contains condensable vapors, dust particles, or corrosive substances. When selecting a vacuum pump, it is necessary to know the gas composition and choose the corresponding pump based on the gas being pumped. If the gas contains vapors, particles, and corrosive gases, auxiliary equipment such as condensers and dust collectors should be considered for installation on the pump's inlet pipeline.
7. When selecting an oil-sealed vacuum pump, consider the impact of the oil vapor (oil mist) discharged by the vacuum pump on the environment. If the environment does not allow pollution, an oil-free vacuum pump should be selected, or the oil vapor should be discharged outdoors.
8. The vibration generated by the vacuum pump during operation may affect the process and the environment. If the process does not allow it, a non-vibrating pump should be selected or anti-vibration measures should be taken.
9. The price of the vacuum pump, operating, and maintenance costs.
After considering various situations, we can finally determine a solution suitable for you:
(1) The minimum investment cost.
(2) The minimum production operating cost.
(3) A feasible plan that reasonably and evenly distributes the first two situations.
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