Radial bearing and air suspension centrifugal compressor

Abstract

The invention discloses a radial bearing and an air suspension centrifugal compressor, relates to the field of compressors, and aims to optimize the structure of the radial bearing. The radial bearing comprises a bearing sleeve, a bearing base and a graphite piece. The bearing sleeve comprises a through hole. The bearing base comprises a cylinder mounted on the inner wall of the through hole and a bearing bush connected with the cylinder through a connecting part. The connecting part is constructed to enable the bearing bush to move relative to the joint of the cylinder body and the bearing bush under the action of external force. The graphite piece is mounted on one side, away from the cylinder, of the bearing bush. According to the radial bearing provided by the technical scheme, due to the connection between the bearing bush and the base plate, the bearing bush cannot be separated from the base plate, and the bearing bush can incline to a certain degree relative to the base plate when being stressed in the working process of the radial bearing, so that the damping of the radial bearing can be adjusted, and the working requirement of the radial bearing is met.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a radial bearing and an air suspension centrifugal compressor. Background technique [0002] The hydrostatic gas bearing is a rotor system that is supported by a pressure gas film between the bearing and the rotor, in which the gas enters the gap between the bearing and the rotor through small holes (laser micropores, porous pores) on the bearing surface , due to the small gap (0.02-0.05mm) between the rotor and the bearing, the gas will be squeezed after entering the gap, causing the pressure to rise, thereby supporting the rotor. Due to the small friction coefficient of gas, the static pressure gas bearing is a kind of bearing with basically no friction and low loss. [0003] Static pressure gas bearings are divided into single small hole throttling type, multi-small hole throttling type, micro groove throttling type, micropore throttling type, porous material throttling type static...

AI Technical Summary

Problems solved by technology

In addition, under high-speed operating conditions, the gas in the bearing gap is compressed and squeezed out of the bearing rotor system, and the kinematic viscosity of the gas film decreases, resulting in a decrease in the damping coefficient of the bearing and a decrease in damping, so the shock absorption of the bearing will be greatly reduced

At this time, the amplitude of the rotor will increase, and eventually exceed the gap between the bearing and the rotor (0.02-0.05mm), which will cause friction with the bearing, damage the bearing, and affect the life and reliability of the entire machine

[0006] The inventors found that the current porous hydrostatic gas bearings provide additional damping by arranging a certain number of O-rings on the outer diameter of the bearing. However, due to the aggravated vibration of the rotor at high speeds, the additional damping provided by it can no longer be very good. The vibration can be effectively eliminated, and because the traditional porous hydrostatic gas bearing usually adopts a single oil wedge design, the porous surface of the entire bearing is a whole block, when the rotor accidentally collides with the bearing during operation When grinding, although the porous material in a certain area may fail, the entire porous surface needs to be replaced, resulting in waste of the entire material and cost

Images