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Vacuum Pump Drive Mode Feb 10, 2020

Vacuum pump drive mode:

 

The two rotors of the vacuum pump are synchronized by a pair of high precision gears. The drive shaft is connected to the motor by a coupling. There are two kinds of transmission structure arrangement: one is to put the motor and gear on the same side of the rotor, as shown in the figure. The driving rotor is driven by the motor directly to the gear so that the torsional deformation of the active rotor shaft is very small and the difference between the two rotors will not change due to the torsional deformation of the large moving shaft so that the difference between the rotors is even during the operation. The biggest disadvantage of this kind of transmission mode is: a. there are three bearings on the transmission shaft, which increases the difficulty of pump processing and assembly, and the disassembly and adjustment of gear is not convenient; B. The overall structure is not uniform, and the center of gravity of the pump is inclined to one side of the motor and gearbox. One kind of characteristic :1) pump speed is big, pressure range is big; 2) the rotor has good geometric symmetry, small vibration and stable operation. There is a gap between the rotor and between the rotor and the shell, no lubrication, small friction loss, can greatly reduce the driving power, so as to achieve higher speed; 3) there is no need for pump cavity, oil sealing and lubrication can reduce the pollution of oil vapor to the vacuum system; 4) no compression in the pump chamber, no exhaust valve. The structure is simple and compact, not sensitive to dust and water vapor in the extraction gas. 5) low compression ratio and poor hydrogen extraction effect; 6) the surface of the rotor is a curved cylinder with complicated shape and difficult processing and inspection