Aerodynamic bearing with radially distributed and overlapped elastic foil

Abstract

The invention relates to an aerodynamic bearing with radial elastic foil, in particular to an aerodynamic bearing provided with radially distributed bump foil and a beam-like structure. The novel aerodynamic bearing with the foil comprises a bearing sleeve, the elastic foil and top layer foil, wherein the elastic foil take the shape of tiles; each foil comprises wavy protrusions in the radial direction of the bearing; the widths and the heights of the protrusions become larger and larger gradually; the elastic foil is uniformly arranged in the circumferential direction of the inner surface of the bearing sleeve; one end of the elastic foil is fixed; the other end of the elastic foil is free, lifted by a certain height and overlapped on the upper surface of the adjacent next foil; the wavy protrusions on adjacent foil are in embedded connection with one another; the bottom planes of grooves of the foil are contacted with one another. Therefore, the bearing has high rigidity and high damping property. During design, the rigidity and the damping property of the bearing can be changed conveniently by changing the shape variation regularity of the protrusions on the foil, so as to improve the load-bearing capacity and the impulsive vibration reducing capability of the bearing.

Description

technical field [0001] The invention relates to a radial elastic foil air bearing, more specifically, it relates to an overlapping elastic foil air dynamic pressure bearing with a beam-like structure and radially distributed corrugated foils. Background technique [0002] The foil air bearing is a self-acting elastically supported gas dynamic pressure bearing. It is composed of bearing sleeve, elastic support foil and top foil etc. Compared with ordinary rotor bearings, it has a series of advantages such as high speed, good precision, high reliability, no oil lubrication, small friction loss, and can work in high temperature environment. Foil gas bearings have broad application prospects in aerospace, national defense and military industries, including new-generation fighter jets, high-temperature gas turbines, cruise missiles, and ultra-low temperature cooling systems. At the same time, elastic foil bearing technology is also one of the core technologies of micro gas turb...

AI Technical Summary

Problems solved by technology

On the one hand, since the support stiffness is completely provided by the single-layer elastic foil, the support stiffness of this type of air bearing is small and the load capacity is insufficient

On the other hand, the overlapping area of ​​adjacent elastic foils has a small contact area during operation, and the damping of the bearing is insufficient, which cannot well alleviate the vibration shock

The lower support stiffness and damping greatly limit the further improvement of the performance of the lapped elastic foil air bearing

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