Foil dynamical pressure radial gas bearing provided with sectionally-combined composite support

Abstract

The invention discloses a foil dynamical pressure radial gas bearing provided with a sectionally-combined composite support, which comprises a bearing block, a plurality of backward wave foils and a plurality of flat foils, wherein the plurality of the flat foils are uniformed distributed along the circumferential direction of the inner wall of the bearing block, the head end of each flat foil isfixed on the inner wall of the bearing block, and the tail end of each flat foil is freely lapped on the inner side of an adjacent flat foil; the backward wave foils are arranged between the flat foils and the inner wall of the bearing block; and the head ends of the backward wave foils are fixed on the inner wall of the bearing block, and the tail ends of the backward wave foils are in a free state. The foil dynamical pressure radial gas bearing provided with the sectionally-combined composite support has high static and dynamic properties and stability; the characteristics of the bearing can be improved by processing surfaces of foil elements and adjusting preloads, the number of subsections and structural parameters, such as the thickness of foils, the distribution of wave arches, the semi-diameters and the heights of the wave arches and the like, of the foil elements; and the foil dynamical pressure radial gas bearing provided with the sectionally-combined composite support also has the advantages of simple structure and easy processing and assembly, and can be conveniently exchanged with the existing radial dynamical pressure gas bearing.

Description

technical field [0001] The invention belongs to the field of dynamic pressure gas bearings in mechanical design, and in particular relates to a foil dynamic pressure radial gas bearing with segmented combined composite support which is suitable for high-speed turbine (turbine) machinery and is applied in different rotational speeds and bearing capacity ranges. bearings. Background technique [0002] With the development of technologies in the fields of aerospace, energy and power, in order to maintain the stability and reliability of high-speed machinery, higher and higher requirements are placed on lubrication technology. When the rotor speed is very high or the relative motion speed is very high, such as aircraft turbine engine or micro gas turbine, the friction caused by high-speed motion makes the oil temperature rise rapidly and cannot form an effective lubricating film, and the oil bearing can no longer meet the needs; When the working environment requires high purity...

AI Technical Summary

Problems solved by technology

However, this kind of bearing has a complex structure and high precision requirements, and the performance of the bearing has a lot to do with the installation situation; moreover, it is difficult to manufacture, and a lot of work needs to be carried out from the design criteria, the determination of the structural size, the selection of materials, and the selection of processing and heat treatment processes. work; in addition, due to structural limitations, the existing corrugated foil bearing structure has uneven rigidity and a small range of load adaptation

Images