Elastic foil sheet gas bearing and elastic foil sheet gas bearing friction pair

Abstract

The invention provides an elastic foil sheet gas bearing and an elastic foil sheet gas bearing friction pair. The elastic foil sheet gas bearing comprises a bearing block, arch foil and a porous lining sleeved with the part between the bearing block and the arch foil. The bearing block is provided with a plurality of gas supply holes evenly arranged in the circumferential direction, and the gas supply pressure of the gas supply holes can be adjusted. The porous lining is provided with a plurality of pressure equalizing holes communicating with the gas supply holes and the arch foil. High-pressure gas in the gas supply holes directly acts on the arch foil through the pressure equalizing holes. During work, high-pressure gas inflation is conducted from the gas supply holes of the bearing block, the high-pressure gas directly acts on the arch foil through the pressure equalizing holes of the porous lining, and additional rigidity and damping are provided for the arch foil. Meanwhile, thevibration situation of a rotor system is analyzed according to the feedback result of the gas supply pressure of the gas supply holes, the gas supply pressure of various gas supply holes is adaptivelyadjusted, accordingly accurate regulation and control over the arch foil rigidity and damping can be achieved, the flexibility of the arch foil is good under the light load condition, the arch foil is not crushed under the heavy load condition, and stability of the rotor system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of elastic foil bearings, and more specifically, relates to an elastic foil gas bearing, and also relates to a friction pair of an elastic foil gas bearing. Background technique [0002] In a typical elastic foil dynamic pressure gas radial bearing, the support stiffness and damping are provided by the air film and the foil, while the stiffness and damping of the arch foil have been determined during the molding process and cannot be adjusted in real time according to the operating status of the rotor system . [0003] In the traditional arch foil structure design, if the design stiffness is too large, the flexibility advantage of the elastic foil cannot be reflected under light load; if the design stiffness is too small, the arch foil will be crushed under heavy load, which also leads to the The disc bearing degenerates into a large gap rigid surface gas bearing, and the load carrying capacity is greatly r...

AI Technical Summary

Problems solved by technology

[0002] In a typical elastic foil dynamic pressure gas radial bearing, the support stiffness and damping are provided by the air film and the foil, while the stiffness and damping of the arch foil have been determined during the molding process and cannot be adjusted in real time according to the operating status of the rotor system

[0003] In the traditional arch foil structure design, if the design stiffness is too large, the flexibility advantage of the elastic foil cannot be reflected under light load; if the design stiffness is too small, the arch foil will be crushed under heavy load, which also leads to the The disc bearing degenerates into a rigid surface gas bearing with a large gap, and the load-carrying capacity is greatly reduced; it affects the stability of the rotor system

[0004] In addition, elastic foil bearings are usually used in the high-speed field. Since the nominal gap between the elastic foil bearing and the rotating shaft is small, high-speed rotation will cause insufficient air supply, and the thin gas cannot form a good lubricating film, which affects the foil. Disc Bearing Performance

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