What does the roots vacuum pump drive on?
Release date:2016-08-12 Author: Click:
The two rotors of the roots vacuum pump operate relatively synchronously through a pair of high precision gears. The drive shaft is connected to the motor by a coupling. There are two main types of transmission structure layout: first, motor and gear are placed on the same side of the rotor as shown in the figure. The driven rotor is driven directly by the motor's end gear, so that the torsional deformation of the active rotor shaft is small, so that the gap between the two rotors will not be changed due to the large torsional deformation of the active shaft, so that the clearance between the rotor and rotor is even in the process of operation.
The biggest disadvantage of this transmission mode is:
A. There are three bearings on the driving shaft, which increase the difficulty of pump processing and assembly, and the gear assembly and adjustment are also inconvenient;
B. The overall structure is not symmetrical, and the center of gravity of the pump is inclined to the side of the motor and gear box.
The other type of roots vacuum pump is the motor and transmission gear respectively installed on both sides of the rotor. This form makes the overall structure of roots vacuum pump symmetrical, but the torsion deformation of the driving shaft is large. In order to ensure uniform clearance of the rotor during operation, sufficient rigidity is required for the shaft, and the connection between the shaft and the rotor should be tightened (currently, there are structures where the rotor and the shaft are welded or cast together). This kind of structure of the roots vacuum pump is easy to disassemble and install, so it is widely used.