Addtime： 2020-07-18 Browse times： 2820
The function of vacuum pump is to remove gas molecules from the vacuum chamber, reduce the gas pressure in the vacuum chamber, and make it reach the required vacuum degree. The quality of vacuum pump selection directly affects the use of water pump, how to select vacuum pump, the following selection strategy hope to help you!
1. Generally, the limit pressure of the pump is lower than the process requirement by about an order of magnitude.
2. The working point of the pump should be selected in this range, and it should not be allowed to work at the allowable working pressure for a long time.
3. Under its working pressure, the vacuum pump should be able to discharge all the gas produced in the process of vacuum equipment.
4. Select vacuum unit:
(1) When one kind of pump can not meet the requirements of air extraction and vacuum, several pumps need to be combined to supplement each other to meet the process requirements.
(2) Some vacuum pumps can not work under atmospheric pressure and need pre vacuum; some vacuum pumps with outlet pressure lower than atmospheric pressure need front stage pumps, so they need to be combined. The combined vacuum pump is called vacuum pump unit. It can make the vacuum system get better vacuum degree and air displacement. We should choose the combined vacuum pump correctly, because different vacuum pumps have different requirements for the gas to be removed. For example, in general, roots rotary vane unit is not suitable for the system containing more condensable gas.
5. Water ring pump, low temperature pump, etc. If the requirements are not strict, you can choose to have an oil pump, plus some anti oil pollution measures, such as adding cold trap, oil trap, baffle, etc., can also meet the requirements of clean vacuum.
6. Understand the composition of the extracted gas, whether there is condensable steam in the gas, whether there is particulate dust, whether there is corrosiveness, etc.
7. If the environment does not allow pollution, oil-free vacuum pump should be selected, or the oil vapor should be discharged to the outdoor.
8. If the process is not allowed, the pump without vibration should be selected or anti vibration measures should be taken.
9. The price, operation and maintenance cost of vacuum pump.
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