Kinetic pressure gas bearing structure with radial support foil slice

Abstract

The invention discloses a dynamic pressure gas bearing structure provided with a radial supporting foil, comprising a bearing body and the radial supporting foil. The structure is characterized in that: a blocking groove tangent with the inner diameter of the axle hole of a bearing body is arranged on the bearing body; the radial supporting foil is inserted into the axle hole along the blocking groove in a tangential way; most of the front end of the foil is closed by winding a circle and along the radial direction that is contrary to the rotating direction of a rotor, and forms a closely attached elastic supporting part with the internal wall of the axle hole; a fastener is arranged on the blocking groove for closely fixing the rear end of the foil inserted in the blocking groove. Compared with the prior art, the radial supporting foil of the invention consists of two layers of foils; wherein, the elastic foil with bubbles has good rigidity and damping and restrains the vibration of the rotor and limits the increase of the amplitude of whirling motion, thus overcoming the shortcomings of complicate structure, requirements for high manufacturing precision and high cost of the existing dynamic pressure radial bearing and obviously enhancing the reliability and economical efficiency of the operation of turboexpanders.

Description

technical field [0001] The invention relates to a bearing structure for high-speed turbomachinery, in particular to a dynamic pressure gas bearing structure with radial supporting foils. Background technique [0002] Due to the superiority of the application of elastic foil bearings in high-speed turbomachinery, its research and application have been paid more and more attention in recent years, and have been developed rapidly; Foil-type foil bearings are widely used in airborne turbines of civil aircraft such as Boeing and fighter jets such as Mirage, automotive turbochargers, and liquid hydrogen and liquid oxygen pumps for aerospace, and its research results and design criteria are rarely seen. report, and its production process is complicated, the development investment is huge, and the process level is high. Therefore, some countries have been devoting themselves to the development of foil bearings with their own characteristics in recent years, expecting to be successf...

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Problems solved by technology

[0003] Xi'an Jiaotong University has conducted in-depth research on flat foil radial bearings supported by copper wires during the years of research on microdynamic gas bearing turboexpanders, and on this basis developed a patent with independent intellectual property rights. The elastic foil dynamic pressure gas bearing supported by a rubber sheet, although the bearing has the advantages of simple structure and good stability, but due to the poor high temperature resistance of the elastic rubber sheet used as the support, the bearing under high-speed turbomachinery conditions The use is limited and has not yet been used in industrial products

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