Method for suppressing vibration fault by adjusting rotation axis of rotor

Abstract

The invention discloses a method for restraining a vibration fault by adjusting the rotating axis of a rotor. The method comprises the following steps that axes corresponding to the circle centers of 24 bolt holes in a seven-stage disc, an eight-stage disc, a nine-stage disc and a nine-stage labyrinth disc of a high-pressure compressor rotor are determined; the offset of the axis is determined; and twenty-four bolt holes in the seventh-stage disc, the eighth-stage disc, the ninth-stage disc and the ninth-stage labyrinth disc are reamed till the twenty-four bolt holes and holes in the compressor shaft are located at the same location degree. By adjusting the angle combination reaming method of each stage of disc, a larger large hole is reamed and simultaneously accommodates two small holes, staggered due to the rotation angle, of the upper disc and the lower disc, so that the deviation of the axis is corrected, the unbalance of couples generated at a high rotation speed is eliminated, and the effects of reducing the vibration amplitude and eliminating vibration faults are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of high-pressure compressor rotor balancing, and in particular relates to a method for suppressing vibration faults by adjusting the rotation axis of a rotor. Background Art

[0002] A certain type of aircraft engine generally has the problem that the axis formed by fitting the centers of the 24 bolt hole index circles of the original high-pressure compressor rotor does not coincide with the high-pressure rotor rotation axis, and there is an offset. The deviation of some engines is too large. The maximum offset is 0.30mm after measurement, resulting in the vector sum of the mass of the stud bolt cavity section and the two-end nuts relative to the rotation axis cannot be offset to 0, and there is a large original unbalance △U. In addition, the balance correction surfaces of the high-pressure rotors 1 and 2 are too far away from the "unbalance source" caused by the above-mentioned original unbalance △U. Therefore, although it seems to be balanced at a low-speed balance of 850r / min according to the process, in fact, at the operating speed of the engine, △U will still produce a large couple imbalance, causing the vibration value to exceed the standard and cannot be eliminated by conventional troubleshooting methods. Summary of the invention

[0003] In order to solve the problem that the axes of 24 bolt holes of the existing high-pressure compressor rotor do not coincide with the rotation axis of the high-pressure rotor, resulting in unbalanced force couples, the present invention proposes a method for suppressing vibration failures by adjusting the rotation axis of the rotor.

[0004] The objective of the present invention is achieved through the following technical solutions: The present invention discloses a method for suppressing vibration failure by adjusting the rotation axis of a rotor, comprising the following steps: Determine the axis corresponding to the center of the 24 bolt holes on the seventh-stage disk, eighth-stage disk, ninth-stage disk, and ninth-stage comb tooth disk of the high-pressure compressor rotor; determining an offset of the axis; The 24 bolt holes on the seventh-stage disk, the eighth-stage disk, the ninth-stage disk, and the ninth-stage comb tooth disk are reamed until they are in the same position as the holes on the compressor shaft.

[0005] Preferably, the reaming of the 24 bolt holes on the seven-stage disc, the eight-stage disc, the nine-stage disc, and the nine-stage comb tooth disc comprises: The 24 bolt holes on the seventh-level disk, the eighth-level disk, the ninth-level disk and the ninth-level comb tooth disk are respectively reamed with the aperture increment being twice of the offset.

[0006] Preferably, the axis corresponding to the center of 24 bolt holes on the seventh-stage disk, the eighth-stage disk, the ninth-stage disk, and the ninth-stage comb tooth disk of the high-pressure compressor rotor comprises: Through three-coordinate measurement, the spatial coordinates of the center of the bolt holes around the disk are fitted, and the axes corresponding to the centers of the 24 bolt holes on the seventh-stage disk, eighth-stage disk, ninth-stage disk and ninth-stage comb disk of the high-pressure compressor rotor are determined.

[0007] Preferably, after determining the offset of the axis, the method further comprises: Through the actual trial installation of each level of disk, the correctness of the three-coordinate measurement fitting axis and the corresponding offset is verified.

[0008] The beneficial effects of the present invention are: The present invention adjusts the angles of various levels of disks to combine the reaming holes, thereby reaming a larger hole to accommodate the two small holes of the upper and lower disks that are offset due to the rotation angle, so as to correct the deviation of the axis, thereby eliminating the imbalance of the force couple generated at high speed, so as to achieve the effect of reducing the vibration amplitude and eliminating vibration faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 A cross-sectional view of the high-pressure compressor rotor. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0012] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0014] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0015] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0016] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] The present invention discloses a method for suppressing vibration failure by adjusting the rotating axis of a rotor, comprising steps S11 to S13.

[0018] Step S11, determining the axis corresponding to the center of 24 bolt holes 1 on the seventh-stage disk, the eighth-stage disk, the ninth-stage disk, and the ninth-stage comb tooth disk of the high-pressure compressor rotor.

[0019] This step can be done by three-coordinate measurement, fitting the spatial coordinates of the center of the bolt hole around the disk to obtain the axis. Figure 1 Specifically, the axis can be obtained by fitting the seven-stage disc, the eight-stage disc, the nine-stage disc, the nine-stage comb disc, and the compressor shaft.

[0020] Step S12, determining the offset of the axis.

[0021] The offset is obtained according to the distance between the axis and the center of the stop.

[0022] After the axis and the offset are determined, in order to ensure the correctness of the offset, the correctness of the three-coordinate measurement fitting axis and the corresponding offset can be verified by physically assembling each level of the disk to find the optimal solution.

[0023] Step S13, reaming the 24 bolt holes on the seventh-stage disk, the eighth-stage disk, the ninth-stage disk, and the ninth-stage comb disk until they are at the same position as the holes on the compressor shaft.

[0024] Specifically, when reaming, the 24 bolt holes on the seven-level disk, eight-level disk, nine-level disk, and nine-level comb disk are reamed respectively according to 2 times of the offset as the aperture increment, that is, the bolt hole diameter obtained by reaming = original aperture + offset * 2.

[0025] By adopting the above-mentioned reaming method, multi-stage disk axis adjustment is achieved, and the deformation bending moment of the rotor at the working speed is reduced, thereby suppressing the occurrence of vibration.

[0026] The method of the present invention adjusts the angles of various levels of disks and combines the reaming holes to reame a bolt hole with a larger diameter and simultaneously accommodates two small holes of adjacent disks that are offset due to the rotation angle, thereby correcting or reducing the offset of the axis, thereby eliminating or reducing the imbalance of the force couple generated under high speed, so as to achieve the effect of reducing the vibration amplitude and eliminating vibration faults.

[0027] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A method for suppressing vibration failure by adjusting the rotor rotation axis, characterized in that: The following steps are involved: Determine the axis corresponding to the center of the 24 bolt holes on the seventh-stage disk, eighth-stage disk, ninth-stage disk, and ninth-stage comb tooth disk of the high-pressure compressor rotor; determining an offset of the axis; The 24 bolt holes on the seventh-stage disk, the eighth-stage disk, the ninth-stage disk, and the ninth-stage comb tooth disk are reamed until they are in the same position as the holes on the compressor shaft.

2. A method for suppressing vibration failure by adjusting the rotor rotation axis according to claim 1, characterized in that: The reaming of 24 bolt holes on the seventh-level disk, the eighth-level disk, the ninth-level disk, and the ninth-level comb tooth disk comprises: The 24 bolt holes on the seventh-level disk, the eighth-level disk, the ninth-level disk and the ninth-level comb tooth disk are respectively reamed with the aperture increment being twice of the offset amount.

3. A method for suppressing vibration failure by adjusting the rotor rotation axis according to claim 1, characterized in that: The method of determining the axis corresponding to the center of 24 bolt holes on the seventh-stage disk, the eighth-stage disk, the ninth-stage disk, and the ninth-stage comb tooth disk of the high-pressure compressor rotor includes: Through three-coordinate measurement, the spatial coordinates of the center of the bolt holes around the disk are fitted, and the axes corresponding to the centers of the 24 bolt holes on the seventh-stage disk, eighth-stage disk, ninth-stage disk and ninth-stage comb disk of the high-pressure compressor rotor are determined.

4. A method for suppressing vibration failure by adjusting the rotor rotation axis according to claim 3, characterized in that: After determining the offset of the axis, the method further comprises: Through the actual trial installation of each level of disk, the correctness of the three-coordinate measurement fitting axis and the corresponding offset is verified.

5. The method for suppressing vibration failure by adjusting the rotor rotation axis according to claim 1, characterized in that: Determining the offset of the axis includes: The offset is determined based on the axis and the center of the stop.

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