A method for correcting the drum ovalization of a turbofan engine fan boost stage

Abstract

The application belongs to the technical field of drum cylinder ovalization correction of aero-engine fan supercharging stage, and particularly relates to a drum cylinder ovalization counterweight correction method of aero-engine fan supercharging stage, which comprises the following steps: taking the center of the aero-engine as the origin, taking the aero-engine axial direction as the X direction, and taking the vertical direction as the Y direction to construct a plane coordinate system; placing the center of the supercharging stage drum cylinder at the origin of the plane coordinate system, so that the notch thereon is located on the Y axis; under the plane coordinate system, calculating the influence of the mass of the counterweight block and the locking block on the ovalization of the supercharging stage drum cylinder in the X axis direction and the Y axis direction; comparing the influence of the mass of the counterweight block and the locking block on the ovalization of the supercharging stage drum cylinder in the X axis direction and the Y axis direction, and correcting the ovalization of the supercharging stage drum cylinder by using the counterweight block.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fan pressure stage drum ovalization correction of an aero-engine, and particularly relates to a fan pressure stage drum ovalization counterweight correction method of an aero-engine. BACKGROUND

[0002] The fan pressure stage drum 1 of the aero-engine is connected to a fan wheel disc 2, and an annular dovetail groove is formed on the fan pressure stage drum 1. The annular dovetail groove has a notch, and the two sides of the notch have locking grooves. The tenon of the root of the fan blade 3 is sequentially slid into the dovetail groove through the notch, and is locked by using the locking block 4 arranged in the locking groove, so that the installation on the fan pressure stage drum 1 is achieved. In order to correct the unbalance of the fan blade 3, a counterweight 5 is arranged at the root of part of the fan blade 3, as shown in Figures 1-3

[0003] The fan pressure stage drum 1 is a thin-walled structure, and has weak anti-deformation ability, especially the notch and the locking groove part, which has weak rigidity and is prone to deformation. The fan pressure stage drum 1 is affected by the centrifugal force of the mass eccentricity of the locking block and the counterweight, and is prone to ovalization deformation when the aero-engine rotates at high speed. The ovalization deformation causes the radial clearance between the fan blade 3 and the casing to be uneven, and further causes the eccentric wear vibration of the casing, thereby causing the performance of the aero-engine to decrease.

[0004] The present application is proposed in view of the existence of the above technical defects.

[0005] It should be noted that the disclosure of the above background art content is only used to assist in understanding the inventive concept and technical solutions of the present application, and it does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. SUMMARY

[0006] The purpose of the present application is to provide a fan pressure stage drum ovalization counterweight correction method of an aero-engine to overcome or alleviate at least one aspect of the known technical defects.

[0007] The technical solution of the present application is:

[0008] A fan pressure stage drum ovalization counterweight correction method of an aero-engine, comprising:

[0009] The center of the aero-engine is taken as the origin, the aero-engine axial direction is taken as the X direction, and the vertical direction is taken as the Y direction to construct a plane coordinate system;

[0010] The center of the pressure stage drum is placed at the origin of the plane coordinate system, and the notch is located on the Y axis;

[0011] In the plane coordinate system, the influence of the mass of the counterweight and the locking block on the ovalization of the pressure stage drum in the X axis direction and the Y axis direction is calculated.​

[0012] The influence of the counterweight and locking block mass on the X-axis and Y-axis direction of the pressurization stage drum ellipse is compared, and the pressurization stage drum ellipse is corrected by using the counterweight.

[0013] According to at least one embodiment of the present application, the fan pressurization stage drum ellipse correction method of the aero-engine is characterized in that,

[0014] The influence of the counterweight and locking block mass on the X-axis and Y-axis direction of the pressurization stage drum ellipse is compared, and the pressurization stage drum ellipse is corrected by using the counterweight.

[0015] Δx=ncosθ;

[0016] Δy=2m+nsinθ;

[0017] Wherein,

[0018] Δx is the influence of the counterweight and locking block mass on the X-axis direction of the pressurization stage drum ellipse;

[0019] Δy is the influence of the counterweight and locking block mass on the Y-axis direction of the pressurization stage drum ellipse;

[0020] n is the mass of the counterweight;

[0021] θ is the angle between the counterweight and the X-axis.

[0022] According to at least one embodiment of the present application, the fan pressurization stage drum ellipse correction method of the aero-engine is characterized in that,

[0023] The influence of the counterweight and locking block mass on the X-axis and Y-axis direction of the pressurization stage drum ellipse is compared, and the pressurization stage drum ellipse is corrected by using the counterweight.

[0024] If Δy>Δx, a counterweight is arranged on the tenon at the root of the two fan blades on the X-axis, and the mass of the counterweight is BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the assembly schematic diagram of the pressurization stage drum, fan wheel disc and fan blade of the aero-engine fan;

[0026] Figure 2 is the A-direction partial view of Figure 1 ;

[0027] Figure 3 is the B-B direction partial sectional view of Figure 1 ;

[0028] Figure 4is a schematic diagram of an engine fan pressure stage drum ovalization counterweight correction method provided by the embodiment of the application;

[0029] wherein:

[0030] 1-pressure stage drum; 2-fan wheel disc; 3-fan blade; 4-locking block; 5-counterweight block.

[0031] In order to better illustrate the embodiment, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual size of the product. In addition, the drawings are only used for illustrative description and cannot be understood as a limitation of the patent. DETAILED DESCRIPTION

[0032] In order to make the technical solutions of the application and its advantages clearer, the technical solutions of the application will be further clearly and completely described in detail below in combination with the drawings. It can be understood that the specific embodiments described herein are only part of the embodiments of the application, which are only used to explain the application, but not to limit the application. It should be noted that, for the purpose of description, only parts related to the application are shown in the drawings, and other related parts can be referred to the general design. In the case of no conflict, the embodiments in the application and the technical features in the embodiments can be combined to obtain new embodiments.

[0033] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of the application should be the general meaning understood by the general technical personnel in the field of the application. The words indicating the relative direction or position relationship, such as "up", "down", "left", "right", "center", "vertical", "horizontal", "inner", "outer" and the like used in the description of the application, are only used to indicate the relative direction or position relationship, and not to imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and the relative position relationship may also change accordingly when the absolute position of the described object changes, therefore, it cannot be understood as a limitation of the application. The "first", "second", "third" and similar terms used in the description of the application are only for the purpose of description, to distinguish different components, and cannot be understood as indicating or implying relative importance. The "one", "an" or "the" and similar terms used in the description of the application should not be understood as an absolute limitation on the quantity, but should be understood as the existence of at least one. The "include" or "contain" and similar terms used in the description of the application mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, and do not exclude other elements or objects.

[0034] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection 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 an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0035] The following is in conjunction with the appendix Figures 1 to 4 This application will be described in further detail.

[0036] A method for correcting the ellipticized counterweight of the fan booster stage drum in an aero-engine includes:

[0037] A planar coordinate system is constructed with the center of the aero-engine as the origin, the aero-engine axis as the X-axis, and the vertical direction as the Y-axis.

[0038] Place the center of the booster stage drum at the origin of the plane coordinate system, so that its notch is located on the Y-axis, and the locking groove and its locking block are close to the Y-axis. It can be further assumed that the locking block is located on the Y-axis.

[0039] In a two-dimensional coordinate system, the effects of the mass of the counterweight and locking block on the ellipticization of the booster stage drum in the X-axis and Y-axis directions are calculated as follows:

[0040] Δx = ncosθ;

[0041] Δy = 2m + nsinθ;

[0042] in,

[0043] Δx represents the effect of the mass of the counterweight and locking block on the ellipticization of the booster stage drum in the X-axis direction;

[0044] Δy represents the influence of the mass of the counterweight and locking block on the ellipticization of the booster stage drum in the Y-axis direction;

[0045] n is the mass of the counterweight;

[0046] θ is the angle between the counterweight and the X-axis;

[0047] When Δy=Δx, it can be considered that the elliptic deformation trend of the booster stage drum is small. Due to the influence of the notch, the combined eccentricity of the counterweight and locking block mass mainly occurs in the Y-axis direction. The Y-axis direction is the major axis direction of the elliptic, but the deformation is limited and no correction is required.

[0048] When Δy < Δx, the combined eccentricity of the counterweight and locking block mass mainly occurs in the X-axis direction. The X-axis direction is the major axis direction of the ellipse, but the stiffness in the X-axis direction is high and the deformation is limited, so no correction is required.

[0049] When Δy > Δx, the booster drum will be deformed in the direction of the long axis of the Y-axis, and will have a larger deformation, which needs to be corrected. Specifically, a counterweight can be arranged on the tenon at the root of the fan blade on the X-axis, that is, a counterweight can be arranged on the tenon at the root of the fan blade in the direction of the short axis of the oval deformation. The mass eccentricity of the counterweight is used to correct and reduce the oval deformation trend of the booster drum. In order to avoid the imbalance brought by the counterweight to the aero-engine, a positive counterweight mass is designed The two tenons at the roots of the fan blades on the X-axis are symmetrically arranged.

[0050] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0051] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings. Those skilled in the art should understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without deviating from the principles of the present application, those skilled in the art can make equivalent changes or replacements to the related technical features. The technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A method for correcting the ellipticized counterweight of the blower stage of an aero-engine fan, characterized in that, include: A planar coordinate system is constructed with the center of the aero-engine as the origin, the aero-engine axis as the X-axis, and the vertical direction as the Y-axis. Place the center of the booster stage drum at the origin of the plane coordinate system, and assume that the locking block is located on the Y-axis; In a planar coordinate system, the effects of the counterweight mass on the ellipticization of the booster stage drum in the X-axis direction, and the effects of the counterweight mass and locking block mass on the ellipticization of the booster stage drum in the Y-axis direction are calculated as follows: Δx = ncosθ; Δy = 2m + nsinθ; in, Δx represents the effect of the counterweight mass on the ellipticization of the booster stage drum in the X-axis direction; Δy represents the influence of the counterweight mass and locking block mass on the ellipticization of the booster stage drum in the Y-axis direction; n is the mass of the counterweight; m is the mass of the locking block; θ is the angle between the counterweight and the X-axis; By comparing the effect of the counterweight mass on the ellipticization of the booster stage drum in the X-axis direction with the effects of the counterweight mass and locking block mass on the ellipticization of the booster stage drum in the Y-axis direction, the ellipticization of the booster stage drum is corrected using the counterweight, specifically as follows: If Δy > Δx, then a counterweight is placed on the tenon at the root of the two fan blades on the X-axis. The mass of this counterweight is... .

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