Eccentric ring, aero-engine and aero-engine rotor eccentricity adjusting method

Abstract

The invention discloses an eccentric ring, an aero-engine and an aero-engine rotor eccentricity adjusting method, relates to the field of aero-engines, and aims to improve the phenomenon of eccentricity of an extrusion oil film damper of the aero-engine. The eccentric ring comprises a wedge-shaped part and a positioning part. The wedge-shaped part is provided with a first through hole, a first surface facing a casing and a second surface facing an elastic support; and in the axial direction of the wedge-shaped part, the distances between the two ends of the first surface and the central axis of the eccentric ring are variable, and the second surface is a cylindrical surface. The wall thicknesses corresponding to different positions of the first surface are changed in the circumferential direction of the wedge-shaped part. The positioning part is provided with a second through hole and is fixedly connected or integrated with the wedge-shaped part; and the positioning part is positioned at the axial end part of the wedge-shaped part. According to the technical scheme, the eccentric phenomenon, caused by the gravity effect, of the extrusion oil film damper is reduced or even eliminated, and the extrusion oil film damper obtains an optimal vibration reduction effect.

Description

technical field [0001] The invention relates to the field of aero-engines, in particular to an eccentric ring, an aero-engine and a method for adjusting the eccentricity of an aero-engine rotor. Background technique [0002] The operating speed of modern aero-engines is getting higher and higher. The rotors of aero-engines mainly adopt elastic support. The rotor system generally works above the critical speed of the rigid body mode or even the bending mode. When the rotor approaches or passes the critical speed, the rotor and the supporting system will Larger vibrations are generated, therefore, it is necessary to increase external damping for vibration reduction. Squeeze oil film damper vibration reduction technology is the most widely used vibration reduction technology of aero-engine rotor-support system. The vibration reduction technology is realized in the following way: the elastically supported outer ring or bearing outer ring is loaded into the sleeve of the fixed b...

AI Technical Summary

Problems solved by technology

[0003] The inventors have found that there are at least the following problems in the prior art: under the action of gravity, the rotor system sinks at the elastic support position, and there is an offset relative to the outer ring of the squeeze film damper, which makes the gap of the squeeze film damper The distribution is uneven, the vertical gap on one side is smaller than the design, and the corresponding 180-degree side gap is larger than the design. This eccentric structure makes the vibration reduction function of the squeeze film damper not meet the requirements.

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