Selection basis of vacuum pump

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Selection basis of vacuum pump

Postby lay1014 » Tue Mar 03, 2020 10:31 am

Selection basis of vacuum pump

The two rotors of vacuum pump are operated synchronously by a pair of high precision gears. The driving shaft is connected with the motor through the coupling. There are mainly two types of transmission structure: one is that the motor and gear are placed on the same side of the rotor. Driven rotor is directly driven by the motor end gear, so that the torsional deformation of the active rotor shaft is small, the gap between the two rotors will not be changed due to the large torsional deformation of the active shaft, so that the gap between the rotors is even in the operation process. When using a pump can not meet the requirements of pumping and vacuum, several pumps need to be combined to complement each other to meet the process requirements.

Some vacuum pumps can't work under atmospheric pressure, so they need pre vacuum; some vacuum pumps need pre pump because the outlet pressure is lower than atmospheric pressure, so they need to be combined. The combined vacuum pump, we call it vacuum pump unit, it can make the vacuum system get better vacuum degree and exhaust volume. We should choose the combined vacuum pump correctly, because different vacuum pumps have different requirements for the extracted gas. For example, in general, roots vane unit is not suitable for systems with more condensable gas. When you choose oil seal pump, you should first understand whether your vacuum system has requirements for oil pollution. If the equipment is strictly oil-free, all kinds of oil pumps should be selected, such as: water ring pump, low temperature pump, etc. If the requirements are not strict, oil pump can be selected, and some anti oil pollution measures, such as adding cold well, oil trap, baffle, etc., can also meet the requirements of clean vacuum.

Understand the composition of the extracted gas. The gas contains no condensable steam, whether there is particle dust, whether there is corrosiveness, etc. When selecting a vacuum pump, it is necessary to know the gas composition and select the corresponding pump for the extracted gas. If the gas contains steam, particles and corrosive gas, auxiliary equipment, such as condenser, dust remover, etc., shall be installed on the air inlet pipeline of the pump. When choosing the oil seal vacuum pump, we should consider how the oil vapor (oil fume) discharged from the vacuum pump affects the environment. If the environment is not allowed to be polluted, the oil-free vacuum pump should be selected or the oil vapor should be discharged to the outdoor. Whether the vibration produced during the operation of vacuum pump affects the process and environment. If the process is not allowed, the pump without vibration shall be selected or anti vibration measures shall be taken.

2BEC Liquid Ring Vacuum Pump

South Africa Vacuum Pump Supplier

Dry Screw Vacuum Pump Application Industry
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