Pump transmission mode:
The two rotors of the Roots vacuum pump are operated synchronously by a pair of high-precision gears. The drive shaft is coupled to the motor via a coupling. There are two main types of transmission structure: one is that the motor and the gear are placed on the same side of the rotor. The driven rotor is directly transmitted by the motor end gear, so that the torsional deformation of the active rotor shaft is small, and the gap between the two rotors is not changed due to the large torsional deformation of the driving shaft, so the gap between the rotors is operated. Uniform in the process. The biggest disadvantage of this type of transmission is: a. There are three bearings on the drive shaft, which increases the difficulty of processing and assembly of the pump, and the disassembly and adjustment of the gear is inconvenient; b. The overall structure is not uniform, the center of gravity of the pump is biased toward the motor and gear One side of the box.
The other is that the motor and the transmission gear are mounted on both sides of the rotor. This form makes the overall structure of the pump symmetrical, but the drive shaft has a large torsional deformation. In order to ensure the uniform gap of the rotor during operation, it is required that the shaft should have sufficient rigidity, and the connection between the shaft and the rotor should be fastened (there is currently a structure in which the rotor is welded or integrally cast). This type of structure is easy to assemble and disassemble, so it is widely used.
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