Multi-layer bubbled foil radial dynamic pressure gas bearing

Abstract

The invention discloses a multi-layer bubbled foil radial dynamic pressure gas bearing, which comprises a bearing block and a shaft which is arranged in the bearing block, wherein the inner side of the bearing block is provided with an elastic supporting component; the elastic supporting component comprises multi-layer elastic bubbled elements arranged on the inner side of the bearing block and a top flat foil arranged between the elastic bubbled elements and the shaft; the top flat foil is attached to the elastic bubbled elements; a shell-shaped bulge with a continuous surface fillet is arranged on each layer of elastic bubbled elements; and one end of the elastic supporting component is fixed on the bearing block through a positioning element, and the other end of the elastic supporting component is free. The multi-layer bubbled foil radial dynamic pressure gas bearing is novel in structure, can generate timely and effective deformation, has adjustable local and integral rigidity and damping height, and has high load adaptability and excellent stability.

Description

technical field [0001] The invention belongs to the field of dynamic pressure gas bearings, and relates to a multilayer bubbling foil radial dynamic pressure gas bearing. Background technique [0002] Gas bearing is a fluid film lubricated bearing using gas as the lubricating medium, that is, an air film is formed between the high-speed rotating rotor and the bearing to avoid direct contact between the moving surface and the static surface. The method used by gas bearings is to use the viscosity of the gas to increase the pressure in the bearing gap, thereby causing objects to float. Gas bearings can be divided into static pressure gas bearings and dynamic pressure gas bearings according to their bearing principles. Compared with the static pressure gas bearing, the dynamic pressure gas bearing does not require an external gas supply, but requires relative motion between the two surfaces forming the wedge-shaped gap, and its dynamic pressure effect becomes more obvious with...

AI Technical Summary

Problems solved by technology

However, the traditional single-layer bubbling foil dynamic pressure radial gas bearing has a relatively large supporting stiffness of the bubbling foil, and there is almost no deformation margin for the bubbling fulcrum. , the surface of the bearing and the main shaft is prone to friction, causing friction damage to the bearing and the rotor; and the surface stiffness of the single-layer bubbling foil bearing is consistent, which cannot meet the needs of the local support stiffness of the bearing changing with the load, and there are certain defects. Poor adaptability and difficulty in bearing uncertain impact loads limit its application in turbomachinery

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