Multi-bushing lap-joint gas bearing with pre-tightening elastic foils and tilting bottom layer

Abstract

The invention provides a multi-bushing lap-joint gas bearing with pre-tightening elastic foils and a tilting bottom layer. The multi-bushing lap-joint gas bearing comprises a shaft, a bearing pedestal, a plurality of tilting bushing blocks, top-layer foils and bottom-layer arch foils; the shaft is embedded into the bearing pedestal, and a plurality of the tilting bushing blocks are arranged between the inner surface of the bearing pedestal and the outer surface of the shaft in the circumferential direction; one bottom-layer arch foil is connected to the inner surface of each tilting bushing block in an attaching mode, and one top-layer foil is connected to the inner surface of each bottom-layer arch foil in an attaching mode; a plurality of spherical crown fulcrums are evenly distributed on the inner-side curved surface of the bearing pedestal in the circumferential direction of the bearing pedestal; and the outer curved surface of each tilting bushing block is provided with a groove which is of a semi-spherical structure, and the grooves are matched with the spherical crown fulcrums. The multi-bushing lap-joint gas bearing has the advantages of an elastic foil gas bearing and a tilting bushing axial bearing concurrently, the bottom tilting bushing blocks rotate under the action of gas film force, then the bearing gas film shape is adjusted, the condition that a shaft neck is not centered can be improved, the fault that the rotor shaft neck rubs and impacts a bearing bushing is effectively avoided, and the multi-bushing lap-joint gas bearing has the advantages of being stable in property, high in integrality, adjustable in pre-tightening and the like.

Description

technical field [0001] The invention belongs to the field of oil-free lubricating bearings, and in particular relates to a gas bearing with multi-tile overlapping belts and pre-tightened elastic foils with a tiltable bottom layer. Background technique [0002] Elastic foil gas bearing is a kind of radial sliding bearing with gas as lubricating medium. It adopts elastic supporting elements for flexible support, so that this kind of bearing has strong self-adaptability and can be used for a long time under high temperature and high speed conditions. run. Typical elastic foil dynamic pressure gas bearings are affected by installation accuracy, foil deformation, and misalignment of the journal. During operation, the top foil will often collide with the lower end surface of the rotor, which may lead to system stability. Reduced resistance, increased wear during long-term operation, and reduced bearing life. Contents of the invention [0003] The object of the present inventio...

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Problems solved by technology

[0003] The object of the present invention is to provide a multi-tile overlapping belt pre-tightened elastic foil gas bearing with a tiltable bottom layer, which solves the problem that the top layer of the foil tends to be in contact with the lower end surface of the rotor during the operation of the existing elastic foil gas bearing. Collision wear occurs, resulting in reduced system stability, increased wear during long-term operation, and the defects of reduced bearing life

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