Elastic support foil hydrodynamic gas bearing with inherent structure pre-wedge space

Abstract

The invention discloses an elastically supported foil dynamic pressure gas bearing with inherent structural pre-wedge space, comprising a bearing and a rotating shaft inside the bearing; an elastic supporting element is arranged inside the bearing, and the elastic supporting element and A top layer of flat foil is arranged between the rotating shafts, a smooth shaft section is arranged in the axial middle area of ​​the surface of the rotating shaft, a row of inclined grooves is provided on the surface of the rotating shaft and on both sides of the smooth shaft section, and the top layer is flat. The inside of the foil wraps around the rotating shaft and forms a pre-gap between the top flat foil and the rotating shaft, while the elastic support element and one end of the top flat foil are fixed at the same position of the bearing and the other end is free; the invention The advantage is that it can form a dynamic pressure air film at a relatively low speed and small foil deformation, make the contact between the shaft and the bearing even during the start and stop stages, reduce the contact friction time and wear between the shaft and the bearing, and improve System stability and reliability.

Description

technical field [0001] The present invention relates to an elastically supported foil hydrodynamic gas bearing with an intrinsic structural pre-wedge space. Background technique [0002] A gas bearing is a non-contact sliding bearing that uses viscous gas as a lubricant. Gas bearings can be divided into static pressure gas bearings and dynamic pressure gas bearings according to the different mechanisms for generating gas film pressure. The static pressure gas bearing uses an external gas source to provide high-pressure gas, which requires an additional gas supply system, which increases the complexity of the overall system. At the same time, the gas supply system compresses and generates high-pressure gas, which reduces the economy of the system and limits the use of the static pressure gas bearing. application range. The dynamic pressure gas bearing uses the gas film pressure generated by the viscous gas in the wedge-shaped gap of the bearing to support the load when the ...

AI Technical Summary

Problems solved by technology

[0004] For foil dynamic pressure gas bearings, during the start-up phase of the rotating shaft, since the effective dynamic pressure film has not been established in the bearing gap, contact friction and wear will inevitably occur on the surface of the rotating shaft and the flat foil surface on the top layer of the bearing, thereby reducing the friction between the rotating shaft and the bearing. service life

At the same time, the worn surface of the shaft and the flat foil surface on the top layer of the bearing are not conducive to the establishment and stability of the dynamic pressure air film, resulting in an increase in the floating time of the shaft and a decrease in the stability and reliability of the bearing.

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