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Vacuum pump type _ how to choose
1。 The limit of the vacuum pump pressure technology to meet the work pressure. Choose the limit pressure of the pump is about one order of magnitude lower than the technical requirements.
2。 Each pump has a certain working pressure range, as a result, the working point of the pump should be within the scope of the choice, and can't make it work in allow the foreign ministers of the working pressure of time.
3。 Under the working pressure, vacuum pump should be able to remove all gas produced in the process of vacuum equipment.
4。 Select vacuum unit:
( 1) When using do not conform to the requirements of the extraction and vacuum pump, the need to pump a few together and complement each other. Meet the process requirements.
( 2) Some of the vacuum pump can't work under atmospheric pressure, need to pre vacuum; Some vacuum pump outlet pressure is lower than the atmospheric pressure, need backing pump, so you need to pump together. Combined with the vacuum pump, we call it a vacuum pump unit, vacuum system can get better vacuum and emissions. We should correct selection of combined type vacuum pump. Because different vacuum water pump to take out gas have different requirements, such as: usually, the roots - Rotating blade unit does not apply to contain more condensable gas system.
5。 When you select the oil seal pump, the first should know whether you need your vacuum system oil. If the device strict with oil free, should choose a variety of oil pump, such as water ring pump, cryogenic pump, etc. If not strict, can choose pumps, plus some oil measures, such as add cold trap, oil baffle plate, a baffle, etc. , can also meet the requirements of clean vacuum.
6。 Understanding to the composition of the gas extraction. The gas contains no condensation of steam, no particles of dust, no corrosion. Choosing a vacuum pump, you need to know the gas composition and select suitable gas pump.
if the steam is contained in the gas, particles and corrosive gas, please consider condenser installed in the pump inlet pipe, dust collector and other auxiliary equipment.
7。 Choosing oil seal vacuum pump, please consider from the vacuum water pump to discharge oil vapor ( Soot) The impact on the environment. If you don't allow pollution environment, you should choose oil-free vacuum pump or the oil vapor emission outside.
8。 Vacuum pump vibration of the work has no effect on the process and the environment. If you don't allow the process, should choose no vibration of the pump or vibration control measures.
9。 The price of the vacuum pump, operation and maintenance costs.
after we consider the situations, we finally can be finalized for your solution:
( 1) The minimum investment cost.
( 2) The lowest production costs.
( 3) Reasonable allocation of first two feasible solutions.
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