The two rotors of the vacuum pump operate relatively synchronously through a pair of high precision gears. The drive shaft is connected with the motor through a coupling. There are mainly two kinds of transmission structure arrangement: one is that the motor and the gear are placed on the same side of the rotor. The driven rotor is driven directly by the end gear of the motor, so that the torsional deformation of the active rotor shaft is small, and the clearance between the two rotors will not change because of the torsional deformation of the active shaft, so that the clearance between the rotors is uniform in the course of operation. When the use of a pump can not meet the requirements of pumping and vacuum, several pumps need to be combined to complement each other in order to meet the technological requirements. Some vacuum pumps can not work at atmospheric pressure and need pre-vacuum. Some vacuum pumps need pre-pump because their outlet pressure is lower than atmospheric pressure. The combined vacuum pump, which we call the vacuum pump unit, can make the vacuum system get better vacuum degree and exhaust volume. We should correctly select the combination of vacuum pumps, because different vacuum pumps have different requirements for the gas extracted, such as: in general, Roots-Rotary Unit is not suitable for systems containing more condensable gases. When you choose an oil seal pump, you should first know whether your vacuum system requires oil contamination. If the equipment is strictly oil-free, all kinds of oil-free pumps should be selected, such as water ring pumps, cryogenic pumps, etc. If the requirements are not strict, you can choose to have oil pumps, plus some anti-oil pollution measures, such as adding cold traps, oil traps, baffles, etc., can also meet the requirements of clean vacuum. Understand the composition of the extracted gas, the gas contains no condensable vapor, dust particles, corrosion and so on. When choosing a vacuum pump, it is necessary to know the gas composition and select the appropriate pump for the pumped gas. If the gas contains steam, particles, and corrosive gas, it should be considered to install auxiliary equipment such as condenser, dust collector in the intake pipeline of the pump. When choosing oil seal vacuum pump, the influence of oil vapor (oil fume) discharged from vacuum pump on environment should be considered. If the environment is not allowed to be polluted, oil-free vacuum pumps should be selected, or oil vapor should be discharged outdoors. Whether the vibration caused by the vacuum pump when working has an impact on the process and environment, if the process is not allowed, the vibration-free pump should be selected or anti-vibration measures should be taken.
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