A support block for an engine stator vane angle adjustment mechanism and its installation structure

Abstract

This application belongs to the technical field of aeroengines, and particularly relates to a support block for an engine stator blade angle adjustment mechanism and its installation structure. In this application, bolts and self-locking nuts for fixing the support block in the conventional structure are cancelled, achieving weight reduction of the fan. At the same time, the problem of unstable adhesion of different materials between the support block and the fan casing is avoided. The support block is a split structure along the axial direction of the engine, and is fixed on the columnar convex platform protruding from the surface of the fan casing by bonding the split surface of the support block. This solution simplifies the installation of the support block, reduces the processing difficulty of the original fan casing, linkage ring, etc., is simple and feasible, has good stability, and provides a new idea for the fan structure design.

Description

Technical Field

[0001] This application belongs to the technical field of aeroengines, and particularly relates to a support block for an engine stator vane angle adjustment mechanism and its installation structure. Background Art

[0002] To meet the performance requirements of aeroengines and improve the working conditions of the fan, the fan stator vanes need to be continuously adjusted within a certain angle range. The commonly used adjustment mechanism consists of a linkage ring, a rocker arm, adjustable vanes, a driving device, etc. The linkage ring is a large-sized ring-shaped part. To ensure the consistency of the single-stage stator vane angle adjustment, a support block needs to be provided between the fan casing and the linkage ring. The support block is fixed on the surface of the casing or the linkage ring by adhesive or bolt connection, so that the linkage ring maintains roundness during circumferential rotation. In the existing technical solutions, the support block is fixed on the outer surface of the casing or the inner surface of the linkage ring by adhesive or bolt connection. The stability of connecting the support block and the casing by adhesive is limited by the bonding process and the experience of the operator. If the support block is made of organic material, it is difficult to bond with the metal casing, and the bonding effect is poor. There has also been a failure of the support block falling off during the actual operation of the engine. The method of fixing the support block on the inner side of the linkage ring by bolts and self-locking nuts has high stability, but the connecting parts (bolts and self-locking nuts) will increase the weight of the engine, which is not conducive to the requirement of reducing the weight of the engine. For a fan stage with a large number of stator vanes, on the one hand, setting bolt holes on the linkage ring will weaken its rigidity, which is not conducive to maintaining the accuracy and stability of the adjustment mechanism; on the other hand, as the number of stator vanes increases, there is also a problem of no structural space on the linkage ring for installing bolts and self-locking nuts. Summary of the Invention

[0003] To solve the above problems, this application provides a support block for an engine stator vane angle adjustment mechanism and its installation structure, including:

[0004] A casing;

[0005] A linkage ring, sleeved on the outer peripheral surface of the casing and rotating relative to the casing;

[0006] A rocker arm, one end of which is hinged to the linkage ring through a bolt assembly;

[0007] An adjustable stator vane, which is hinged to the other end of the rocker arm;

[0008] At the gap between the casing and the linkage ring, there are multiple groups of circumferentially distributed stop bosses on the outer peripheral surface of the casing. The number of each group of stop bosses is at least two; at least two cross-sectional contour lines of each group of stop bosses have angles with the opening facing radially outward;

[0009] A support block is installed on each set of stop bosses, and the support block is divided into a first half block and a second half block along a butt joint surface perpendicular to the axial direction of the engine, the first half block has a first half groove, and the second half block has a second half groove, and when the first half block and the second half block are butt jointed, the first half groove and the second half groove form a positioning groove sleeved on the stop boss;

[0010] During assembly, the first half block and the second half block are respectively brought close to each other and docked from both sides of the stop boss, so that the positioning groove is sleeved on the stop boss, and the docking surfaces of the first half block and the second half block are connected by adhesive.

[0011] Preferably, the stopping bosses are columnar, and the axes of each group of columnar stopping bosses have a certain angle therebetween.

[0012] Preferably, the columnar shape includes a cylinder and a prism.

[0013] Preferably, the end of the stopping boss has a radial limiting protrusion, the positioning groove has a groove for accommodating the radial limiting protrusion, and the radial limiting protrusion is placed in the groove to limit the support block from radially escaping.

[0014] Preferably, the number of each set of stopping bosses is two.

[0015] Preferably, the stopping bosses include at least two groups that are evenly distributed circumferentially outside the casing.

[0016] The advantages of the present application include: for each support block, the fan casing is provided with at least two corresponding stop bosses, and the at least two stop bosses can cooperate with each other to form a slope that limits the support block from slipping out. For ease of installation, the support block is a split structure along the axial direction of the engine, and a positioning groove that cooperates with the fan stop boss is provided on the split surface of the support block. The support block is fixed to the outside of the fan casing by bonding the split surfaces of the support block. In this solution, the support block can be fixed by gluing the same material and using the stop boss on the outer wall of the fan casing, without the need for extra connectors, providing a new idea for the fan structure design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a support block of an engine stator blade angle adjustment mechanism and its mounting structure at a location with a stop boss in a preferred embodiment of the present application.

[0018] Figure 2 This is a cross-sectional view of a preferred embodiment of the present application of an engine stator blade angle adjustment mechanism support block and its mounting structure without a stop boss

[0019] Figure 3 This is a partial diagram of the cooperation between the support block and the stop boss in a preferred embodiment of the present application. DETAILED DESCRIPTION

[0020] To make the technical solutions and their advantages of this application clearer, the following will further describe the technical solutions of this application clearly and completely in conjunction with the accompanying drawings. It can be understood that the specific embodiments described herein are only partial embodiments of this application, which are only used to explain this application and not to limit this application. It should be noted that for the convenience of description, only the parts related to this application are shown in the drawings, and other related parts can refer to the general design. Without conflict, the embodiments and the technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0021] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application should have the ordinary meanings understood by those of ordinary skill in the technical field to which this application belongs. The words indicating directions such as "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", etc. used in the description of this application are only used to indicate relative directions or position relationships, rather than implying that the device or component must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the object being described changes, its relative position relationship may also change accordingly. Therefore, it should not be understood as a limitation to this application. The terms "first", "second", "third" and similar terms used in the description of this application are only for descriptive purposes to distinguish different components, and cannot be understood as indicating or implying relative importance. The similar words such as "a", "an" or "the" used in the description of this application should not be understood as an absolute limitation on the quantity, but should be understood as having at least one. The similar words such as "including" or "comprising" used in the description of this application are intended to mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects.

[0022] In addition, it should also be noted that unless otherwise clearly specified and limited, the similar words such as "installed", "connected", "coupled" used in the description of this application should be understood in a broad sense. For example, the 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 directly connected or indirectly connected through an intermediate medium, and can also be the communication inside two components. Those skilled in the art can understand its specific meaning in this application according to the specific situation.

[0023] As Figures 1 - 3 shown, to solve the above problems, this application provides a support block for an engine stator blade angle adjustment mechanism and its installation structure, including:

[0024] Casing 3;

[0025] Linkage ring 6, sleeved outside the outer peripheral surface of the casing 3 and rotatable relative to the casing 3;

[0026] A rocker arm 8, one end of which is hinged to the linkage ring 6 through a bolt assembly 5;

[0027] An adjustable stator blade 9, which is hinged to the other end of the rocker arm 8;

[0028] At the gap between the casing 3 and the linkage ring 6, the outer peripheral surface of the casing 3 is provided with a plurality of groups of circumferentially distributed stop bosses 2, and the number of each group of stop bosses 2 is at least two; at least two cross-sectional contour lines of each group of stop bosses 2 have an angle with the opening facing radially outward; a support block 4 is installed on each group of stop bosses 2, and the support block 4 is divided into a first half block and a second half block along a docking surface perpendicular to the axial direction of the engine, the first half block has a first half groove, and the second half block has a second half groove, and when the first half block and the second half block are docked, the first half groove and the second half groove form a positioning groove sleeved on the stop boss 2;

[0029] During assembly, the first half block and the second half block are respectively brought close to each other and docked from both sides of the stop boss 2 so that the positioning groove is sleeved on the stop boss 2 , and the docking surfaces of the first half block and the second half block are connected by adhesive 1 .

[0030] In an optional embodiment, the engine stator blade angle adjustment mechanism support block and its mounting structure of the present application, wherein the stop boss 2 includes a cylindrical shape. When the stop boss 2 is cylindrical, in order to achieve that the cross-sectional contour lines of each group of stop bosses 2 have at least two angles with openings facing radially outward, there is a certain interval between the cylindrical stop bosses 2, and the axes of the cylindrical stop bosses 2 all point to the axis of the engine, so that the axes of the stop bosses 2 will form a certain angle such as Figure 3 As shown in the angle a, in each group of stop bosses 2, an angle with an opening facing radially outward is formed between the outermost side generatrix of the stop boss 2 at one circumferential end, such as the first line A, and the outermost side generatrix of the stop boss 2 at the other end, such as the second line B. The first line A and the second line B cooperate with the support block 4 to form a slope surface that limits the radial escape of the support block 4, so that the support block 4 is completely fixed. The cylindrical stop boss 2 is obviously easy to process and install, and the stop boss with its axis line pointing to the axis line of the engine will not affect the dynamic balance of the engine.

[0031] In an optional embodiment, the engine stator blade angle adjustment mechanism support block and its mounting structure of the present application, wherein the column is a prism, and similar to the above embodiment, in order to achieve that the cross-sectional contour lines of each group of stop bosses 2 have at least two angles with openings facing radially outward, there is a certain interval between the prismatic stop bosses 2, and the axes of the cylindrical stop bosses 2 all point to the axis of the engine, so that the axes of the stop bosses 2 will form a certain angle such as Figure 3As shown in the angle a, the first line A formed by the outermost side line or ridge of the stop boss 2 at one circumferential end and the second line B formed by the outermost side line or ridge of the stop boss 2 at the other end will form an angle with the opening facing radially outward, and the first line A and the second line B will cooperate with the support block 4 to form a slope surface that limits the radial escape of the support block 4, so that the support block 4 is completely fixed.

[0032] The end of the stop boss 2 is provided with a radial limiting protrusion, and the positioning groove is provided with a groove for accommodating the radial limiting protrusion. The radial limiting protrusion is placed in the groove to limit the support block 4 from radially escaping.

[0033] The number of each set of stop bosses 2 is two.

[0034] The stop bosses 2 include at least two groups uniformly distributed circumferentially outside the casing 3 .

[0035] The advantages of the present application include: for each support block, the fan casing is provided with at least two corresponding stop bosses, and the at least two stop bosses can cooperate with each other to form a slope that limits the support block from slipping out. For ease of installation, the support block is a split structure along the axial direction of the engine, and a positioning groove that cooperates with the fan stop boss is provided on the split surface of the support block. The support block is fixed to the outside of the fan casing by bonding the split surfaces of the support block. In this solution, the support block can be fixed by gluing the same material and using the stop boss on the outer wall of the fan casing, without the need for extra connectors, providing a new idea for the fan structure design.

[0036] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An installation structure of a support block for an engine stator blade angle adjustment mechanism, characterized in that include: Receiver (3); A linkage ring (6) is sleeved on the outer peripheral surface of the casing (3) and rotates relative to the casing (3); A rocker arm (8), one end of which is hinged to the linkage ring (6) via a bolt assembly (5); An adjustable stator blade (9) which is hinged to the other end of the rocker arm (8); The invention is characterized in that, at the gap between the casing (3) and the linkage ring (6), the outer peripheral surface of the casing (3) is provided with a plurality of groups of circumferentially distributed stop bosses (2), and the number of each group of stop bosses (2) is at least two; and the cross-sectional contour lines of each group of stop bosses (2) have at least two angles with the openings facing radially outward; A support block (4) is mounted on each set of stop bosses (2); the support block (4) is divided into a first half block and a second half block along a butt joint surface perpendicular to the axial direction of the engine; the first half block has a first half groove, and the second half block has a second half groove; when the first half block and the second half block are butt jointed, the first half groove and the second half groove form a positioning groove that is sleeved on the stop boss (2); During assembly, the first half block and the second half block are brought close to each other and docked from both sides of the stop boss (2) so that the positioning groove is sleeved on the stop boss (2), and the docking surfaces of the first half block and the second half block are connected by adhesive (1).

2. The mounting structure of the support block of the engine stator blade angle adjustment mechanism according to claim 1, characterized in that: The stop bosses (2) are columnar, and the axes of each group of columnar stop bosses (2) have a certain angle between them.

3. The mounting structure of the support block of the engine stator blade angle adjustment mechanism according to claim 2, characterized in that: The columnar shape is cylindrical or prism-shaped.

4. The mounting structure of the support block of the engine stator blade angle adjustment mechanism according to claim 1, characterized in that: The end of the stop boss (2) is provided with a radial limiting protrusion, the positioning groove is provided with a groove for accommodating the radial limiting protrusion, and the radial limiting protrusion is placed in the groove to limit the support block (4) from radially falling out.

5. The mounting structure of the support block of the engine stator blade angle adjustment mechanism according to claim 1, characterized in that: The number of each set of stop bosses (2) is two.

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