Dynamic pressure gas radial bearing with axial variable stiffness and viscoelastic structure

Abstract

The invention discloses a foil dynamic pressure gas bearing structure with the axial variable stiffness and a viscoelastic structure. The foil dynamic pressure gas bearing structure with the axial variable stiffness and the viscoelastic structure comprises a bearing seat and a foil component which is fixed on the bearing seat. The foil dynamic pressure gas bearing structure is characterized in that a smooth metal flat foil is arranged on a top layer of the foil component; a high-temperature-resistant viscoelastic foil is arranged on a middle layer of the foil component; a metal foil with a bubble-shaped protrusion is arranged on a bottom layer of the foil element; the height of the bubble-shaped protrusion gradually changes in the axial direction; the winding direction of the foil component is opposite to the rotation direction of a rotor. Compared with the prior art, the bearing is simple in structure and easy to process and assemble; the viscoelastic foil can improve the stress concentration condition of the bubble-shaped protrusion, absorb the vibration and the shock of a rotor-bearing system when operating and inhibiting the increase of vibration amplitude of the rotor; the foil at the bottom layer can reduce the negative influence of axle journal inclination on a gas member gap, and reduce the possibility of damaging the surface of the bearing, so that the operation reliability is obviously improved and the bearing capacity is improved.

Description

technical field [0001] The invention relates to a foil dynamic pressure gas bearing structure with axially variable stiffness and viscoelastic structure for high-speed rotating machines. Background technique [0002] Foil dynamic pressure gas bearings have the advantages of high speed, long life, and good stability, and are widely used in high-speed rotating machinery (such as turboexpanders, turbocompressors, turbochargers, etc.). At present, the commonly used foil dynamic pressure gas bearing structure is corrugated foil type foil bearing. Results and design criteria are rarely reported. In order to develop a foil dynamic pressure gas bearing that is suitable for domestic processing level, simple in structure, and easy to manufacture, Xi'an Jiaotong University proposed a dynamic pressure gas radial bearing structure with radial support and carried out related experimental research. The bearing structure Such as figure 1 As shown, the test results show that the foil dyna...

AI Technical Summary

Problems solved by technology

At present, the commonly used foil dynamic pressure gas bearing structure is corrugated foil type foil bearing. Results and design criteria are rarely reported

In order to develop a foil dynamic pressure gas bearing that is suitable for domestic processing level, simple in structure, and easy to manufacture, Xi'an Jiaotong University proposed a dynamic pressure gas radial bearing structure with radial support and carried out related experimental research. The bearing structure like figure 1 As shown, the test results show that the foil dynamic pressure gas radial bearing has a very simple structure and high stability, but compared with other foil dynamic pressure gas radial bearings, the bearing capacity is slightly insufficient

Especially when the load exceeds a certain limit, the bubble-like protrusions of the bottom foil can easily break the top foil, causing mechanical damage to the top foil, or the bubble-like protrusions of the bottom foil are flattened by the top foil, which seriously affects the The load carrying performance of the dynamic pressure gas bearing

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