Positioning tool, outlet guide vane, assembly method and aero-engine

Abstract

The invention provides a positioning tool, an outlet guide vane, an assembling method and an aero-engine. The positioning tool is used for assembling the outlet guide vane, and the outlet guide vane comprises a vane body with a cavity, a lining plate bonded in the cavity and a cover plate bonded on the lining plate. The cover plate is provided with a preset assembling position on the blade body, and a gap is formed between the peripheral edge of the cover plate located at the preset assembling position and the inner side wall of the cavity; the positioning tool provides an assembling space matched with the cover plate and can be positioned at the position where the gap is located, so that a preset assembling position is defined through the assembling space; the positioning tool is provided with a guide inlet, so that the cover plate can enter the assembly space and is further positioned at a preset assembly position; and the positioning tool is detachably matched with the cover plate positioned at the preset assembly position, so that the positioning tool can be separated from the blade body after the cover plate is positioned at the preset assembly position. The positioning tool can effectively position the position of the cover plate.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular to a positioning fixture, an outlet guide vane, an assembly method, and an aero-engine. Background Technology

[0002] Axial-flow turbomachinery, typically exemplified by axial-flow aero engines, consists of two rotors: a high-pressure rotor and a low-pressure rotor. The low-pressure rotor comprises an inlet low-pressure fan and an outlet low-pressure turbine. An intermediate unit connects the low-pressure fan to the high-pressure compressor; this unit forms part of the engine's load-bearing frame, bearing the engine's main loads and transmitting them through the mounting section. Outlet guide vanes are mounted on the intermediate inner casing, primarily guiding the outlet airflow and bearing the engine's radial loads. During engine operation, the outlet guide vanes experience significant aerodynamic loads due to the bypass duct airflow, and foreign matter in the airflow also passes through them. Their aerodynamic performance directly impacts the efficiency and performance of the entire turbine system.

[0003] However, the structure, materials, and manufacturing process of the exit guide vanes can all affect their aerodynamic performance, thereby reducing the overall performance and reliability of the aero-engine. Summary of the Invention

[0004] The purpose of this invention is to provide a positioning fixture that can improve the aerodynamic performance of blades.

[0005] One aspect of the present invention provides a positioning fixture for assembling an outlet guide vane, the outlet guide vane comprising a vane body having a cavity, a liner bonded to the cavity, and a cover plate bonded to the liner; the cover plate has a preset assembly position on the vane body, and a gap exists between the outer peripheral edge of the cover plate at the preset assembly position and the inner wall of the cavity; the positioning fixture provides an assembly space adapted to the cover plate and can be positioned at the location of the gap, thereby defining the preset assembly position through the assembly space; the positioning fixture provides a guide inlet so that the cover plate can enter the assembly space and be positioned at the preset assembly position; the positioning fixture and the cover plate positioned at the preset assembly position are detachably engaged, and the positioning fixture can detach from the vane body after the cover plate is positioned at the preset assembly position.

[0006] In one embodiment, the positioning fixture is annular, and the inner peripheral sidewall of the positioning fixture encloses the assembly space; after the cover plate enters the assembly space, the outer peripheral edge of the cover plate abuts against the inner peripheral sidewall of the positioning fixture, thereby positioning the cover plate at the preset assembly position.

[0007] In one embodiment, the distance between the inner and outer peripheral sidewalls of the positioning fixture is consistent with the gap, so that the outer peripheral sidewall of the positioning fixture can fit against the inner sidewall of the cavity, thereby enabling the positioning fixture to be positioned at the location of the gap.

[0008] In one embodiment, the positioning fixture has an anti-interference structure to prevent damage to the blade body and the cover plate by the positioning fixture.

[0009] In one embodiment, the anti-interference structure includes a first chamfer, which connects the outer peripheral sidewall and the bottom wall of the positioning fixture. The first chamfer is used to prevent the blade body from being damaged by the positioning fixture.

[0010] In one embodiment, the anti-interference structure includes a second chamfer, which connects the inner peripheral sidewall and the top wall of the positioning fixture, and the second chamfer is used to prevent the cover plate from being damaged by the positioning fixture.

[0011] In one embodiment, the top wall of the positioning fixture is higher than the surface of the blade body or the surface of the cover plate.

[0012] Another aspect of the present invention provides an assembly method for an outlet guide vane, which is assembled using the positioning fixture. The assembly method includes: bonding a liner to a cavity in the blade body; fixing the positioning fixture in the cavity in the blade body; assembling a cover plate in the assembly space of the positioning fixture; removing the positioning fixture; and curing the cover plate, the liner, and the blade body.

[0013] Another aspect of the present invention provides an outlet guide vane, which is assembled by the assembly method described above.

[0014] Another aspect of the present invention provides an aero-engine, the aero-engine including an outer casing, an inner casing, and an outlet guide vane connecting the outer casing and the inner casing; the outlet guide vane is the aforementioned outlet guide vane.

[0015] The positioning fixture of the present invention is positioned at the location of the gap before the cover plate is assembled, thereby restricting the assembly position of the cover plate and ensuring that the cover plate is located in the preset assembly position. This reduces the impact of the reserved gap on the cover plate assembly, effectively positions the cover plate, improves the accuracy of the outlet guide vane profile, and reduces the impact of inaccurate cover plate positioning caused by the reserved gap on the aerodynamic performance of the outlet guide vane. Furthermore, it also improves the bonding efficiency and shortens the trial production time of the outlet guide vane. Attached Figure Description

[0016] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of the installation of the outlet guide vanes in an aero engine;

[0018] Figure 2 yes Figure 1 A schematic diagram of the outlet guide vanes;

[0019] Figure 3 yes Figure 2 A cross-sectional view of the outlet guide vanes in the middle;

[0020] Figure 4 This is a schematic diagram of an embodiment of the positioning tooling according to the present invention and its cooperation with the outlet guide vanes;

[0021] Figure 5 yes Figure 4 A cross-sectional view of the outlet guide vanes in the middle;

[0022] Figure 6 yes Figure 5 A magnified view of a portion of the positioning fixture;

[0023] Figure 7 This is a schematic flowchart of an embodiment of the assembly method of the outlet guide vane according to the present invention. Detailed Implementation

[0024] The following embodiments are for Figures 1 to 3 The illustrated outlet guide vane has been improved. The term "outlet guide vane" refers to a vane used in aero engines to connect the outer and inner casings, specifically in the outer bypass duct of a turbofan engine, to guide the exit airflow. The term "bonding" is a method of firmly joining similar or dissimilar materials together using the adhesive force generated on a solid surface. The term "circumferential" refers to the direction about or parallel to the central axis of a component.

[0025] like Figure 1 As shown, an outlet guide vane 10 is installed between the inner casing 2 and the outer casing 1 of the aero-engine. Its main function is to guide the outlet airflow and bear the radial load of the engine. During engine operation, due to the effect of the bypass airflow, the outlet guide vane 10 bears a large aerodynamic load, and foreign matter in the airflow passes through the outlet guide vane 10. In the design process, considering weight reduction requirements, the outlet guide vane 10 is designed as a hollow structure. Figure 2 and Figure 3As shown, a cavity 11a is provided in the blade body 11, and the cavity 11a and the surface of the blade body 11 are transitioned by an annular step 11b. The surface of the blade body 11 is a plane surrounding the cavity 11a. Due to the annular step 11b, the cavity 11a can be divided into a first cavity and a second cavity. (Reference) Figure 3 The first cavity is located below the second cavity. A liner 12 is added to cavity 11a to ensure its rigidity. The liner 12 and the cover plate 13 need to be bonded to the blade body 11. The liner 12 is assembled in the first cavity, and the cover plate 13 is assembled in the second cavity. Figure 3 As shown, for example, the bottom wall of the liner 12 is bonded to the bottom wall of the first cavity, the bottom wall of the cover plate 13 is bonded to the liner 12, and the circumferential outer edge of the bottom wall of the cover plate 13 is bonded to the plane of the annular step 11b.

[0026] Due to the need to ensure sufficient space for colloid outflow after bonding, a gap 14, typically 1-2 mm, is required around the perimeter of the cover plate 13. Currently, the cover plate 13 is usually assembled manually, with operators visually inspecting or using measuring tools to bond it to the liner plate 12. This makes precise positioning of the cover plate 13 difficult, posing challenges to its assembly. An improperly positioned cover plate 13 directly affects the accuracy of the airfoil shape of the outlet guide vane 10, impacting aerodynamic performance. The error in manual assembly of the cover plate 13 is generally between 0.2 mm and 0.5 mm, resulting in an impact of approximately 0.5% to 1% on the aerodynamic performance of the blades. Therefore, assembly errors caused by the bonding of the cover plate 13 can significantly affect the aerodynamic performance of the blades.

[0027] Reference will now be made in detail to embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the invention and not to limit it. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the invention without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, the invention is intended to cover these modifications and variations that fall within the scope of the appended claims and their equivalents.

[0028] exist Figures 1 to 3 Based on the outlet guide vane 10 shown, Figures 4 to 6The diagram illustrates the fitting relationship between an embodiment of the positioning fixture 100 of the present invention and the outlet guide vane 10. The positioning fixture 100 is used to assemble the outlet guide vane 10. The outlet guide vane 10 includes a vane body 11 having a cavity 11a, a liner 12 bonded to the cavity 11a, and a cover plate 13 bonded to the liner 12. The cover plate 13 has a preset assembly position on the vane body 11, and a gap 14 exists between the outer peripheral edge of the cover plate 13 at the preset assembly position and the inner wall of the cavity 11a. The gap 14 is a pre-reserved gap to meet the requirements of the bonding process, such as ensuring space for colloid flow after the liner 12 and the cover plate 13 are bonded. The positioning fixture 100 provides an assembly space adapted to the cover plate 13 and can be positioned at the location of the gap 14 to define the preset assembly position through the assembly space. The positioning fixture 100 provides a guide inlet so that the cover plate 13 can enter the assembly space and be positioned at the preset assembly position. The positioning fixture 100 can be disengaged from the cover plate 13 which is positioned at the preset assembly position, so that the positioning fixture 100 can be disengaged from the blade body 11 after the cover plate 13 is positioned at the preset assembly position.

[0029] The positioning fixture 100 is positioned at the location of the gap 14 before the cover plate 13 is assembled, so as to restrict the assembly position of the cover plate 13, so that the cover plate 13 is located in the preset assembly position, reducing the impact of the reserved gap 14 on the assembly of the cover plate 13. It can effectively position the cover plate 13, improve the accuracy of the airfoil of the outlet guide vane 10, reduce the impact on its aerodynamic performance, and at the same time improve the bonding efficiency and shorten the trial production time of the outlet guide vane 10.

[0030] The pre-set assembly position of the cover plate 13 on the annular step 11b is adapted to the cover plate 13. The assembly space and guide entrance provided by the positioning fixture 100 are connected, and at least part of the assembly space coincides with the pre-set assembly position of the cover plate 13 on the annular step 11b, thus enabling the positioning of the cover plate 13.

[0031] like Figure 4 and Figure 6 As shown, in one embodiment, the positioning fixture 100 is annular, and its inner peripheral sidewall 150 encloses an assembly space. In this embodiment, the preset assembly position coincides with the outer peripheral edge of the cover plate 13, and the assembly space provided by the positioning fixture 100 coincides with the preset assembly position. After the cover plate 13 enters the assembly space, the outer peripheral edge of the cover plate 13 abuts against the inner peripheral sidewall 150 of the positioning fixture 100, thereby positioning the cover plate 13 at the preset assembly position. Thus, the cover plate 13 can be directly placed into the positioning fixture 100, reducing the difficulty of assembling the cover plate 13, simplifying the assembly method, and improving the bonding efficiency of the cover plate 13.

[0032] refer to Figure 5 and 6In one embodiment, the distance between the outer peripheral sidewall 130 and the inner peripheral sidewall 150 of the positioning fixture 100 (i.e., the thickness of the positioning fixture 100) is consistent with the gap 14. The inner peripheral sidewall 150 and the outer peripheral sidewall 130 of the positioning fixture 100 are arranged opposite to each other. The positioning fixture 100 can completely fill the gap 14, such as... Figure 6 As shown. This allows the outer peripheral sidewall 130 of the positioning fixture 100 to fit against the inner sidewall of the second cavity, thereby positioning the positioning fixture 100 at the location of the gap 14. This simplifies the steps of fixing the positioning fixture 100 and improves assembly efficiency.

[0033] In one embodiment, the positioning fixture 100 has an anti-interference structure to prevent damage to the blade body 11 and the cover plate 13 by the positioning fixture 100.

[0034] like Figure 6 As shown, the anti-interference structure includes a first chamfer 110, which connects the outer peripheral sidewall 130 and the bottom wall (not shown) of the positioning fixture 100. The first chamfer 110 is used to prevent the blade body 11 from being damaged by the positioning fixture 100. Figure 6 As shown, the first chamfer 110 and the inner wall of the second cavity, as well as the annular step 11b, are opposite each other, which can prevent assembly interference and protect the blade body 11.

[0035] Furthermore, the first chamfer 110 can be selected as a slope or an arc structure. The inclination of the slope can be determined according to the connection arc between the inner wall of the second cavity and the annular step 11b, ensuring that the positioning fixture 100 and the blade body 11 do not interfere with each other.

[0036] Continue to refer to Figure 6 The anti-interference structure includes a second chamfer 120, which connects the inner peripheral sidewall 150 and top wall 140 of the positioning fixture 100. The second chamfer 120 is used to prevent the cover plate 13 from being damaged by the positioning fixture 100 during assembly. The second chamfer 120 can be a bevel or an arc structure. The second chamfer 120 makes the guide entrance of the positioning fixture 100 larger than that of the cover plate 123, facilitating the assembly of the cover plate 13.

[0037] In one embodiment, such as Figure 6 As shown, the top wall 140 of the positioning fixture 100 is higher than the surface of the blade body 11 or the surface of the cover plate 13. The top wall 140 of the positioning fixture 100 is connected to the outer peripheral side wall 130 and the inner peripheral side wall 150, and is positioned opposite to the bottom wall. The top wall 140 being higher than the surface of the blade body 11 or the surface of the cover plate 13 facilitates the removal of the positioning fixture 100 after the cover plate 13 has been positioned. The height by which the positioning fixture 100 protrudes from the blade body 11 can be determined based on the actual situation requiring ease of removal of the positioning fixture 100 by personnel or tools.

[0038] The positioning fixture 100 can be formed by extrusion of a forging and bonding of its two ends to form a ring to match the gap 14.

[0039] The positioning fixture 100 and the blade body 11 of the present invention have a fitting accuracy of ±0.1mm. The error of assembling the cover plate 13 by using the positioning fixture 100 can be reduced to within 0.1mm, thereby reducing the impact on the aerodynamic performance of the blade.

[0040] Figure 7 An embodiment of the assembly method for the outlet guide vane 10 provided by the present invention is shown. The assembly method for the outlet guide vane 10 provided by the present invention is performed by the positioning fixture 100 described above. The assembly method includes steps S100 to S400:

[0041] In step S100, the liner 12 is bonded to the cavity 11a of the blade body 11.

[0042] In step S200, the positioning fixture 100 is fixed on the annular step 11b of the blade body 11.

[0043] In step S300, the adhesive-coated cover plate 13 is assembled into the assembly space of the positioning fixture 100, thereby fixing the cover plate 13 in the preset assembly position.

[0044] In step S400, the positioning fixture 100 is removed, and the cover plate 13, the liner plate 12 and the blade body 11 are cured.

[0045] In one embodiment, in step S300, within the assembly space of the positioning fixture 100, the cover plate 13 is connected to the liner plate 12 by adhesive bonding.

[0046] In one embodiment, in step S400, the outlet guide vane 10 can be placed in a furnace for colloid curing.

[0047] This invention provides an outlet guide vane 10, which is assembled using the aforementioned assembly method. The outlet guide vane 10 obtained by the above assembly method has high airfoil accuracy, minimal impact of airfoil on its aerodynamic performance, and good aerodynamic performance.

[0048] This invention provides an aero-engine, which includes an outer casing 1, an inner casing 2, and an outlet guide vane connecting the outer casing 1 and the inner casing 2. The outlet guide vane is an outlet guide vane 10.

[0049] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A positioning fixture for assembling an outlet guide vane, the outlet guide vane comprising a vane body having a cavity, a liner bonded to the cavity, and a cover plate bonded to the liner; The cover plate has a preset assembly position on the blade body, and there is a gap between the outer peripheral edge of the cover plate located at the preset assembly position and the inner wall of the cavity. Its features are, The positioning fixture provides an assembly space that is compatible with the cover plate and can be positioned at the location of the gap, so as to define the preset assembly position through the assembly space; The positioning fixture provides a guide entrance so that the cover plate can enter the assembly space and be positioned at the preset assembly position. The positioning fixture can be detachably engaged with the cover plate positioned at the preset assembly position, so that the positioning fixture can detach from the blade body after the cover plate is positioned at the preset assembly position.

2. The positioning fixture as described in claim 1, characterized in that, The positioning fixture is annular, and the inner peripheral sidewalls of the positioning fixture enclose the assembly space. After the cover plate enters the assembly space, the outer peripheral edge of the cover plate abuts against the inner peripheral sidewall of the positioning fixture, thereby positioning the cover plate in the preset assembly position.

3. The positioning fixture as described in claim 2, characterized in that, The distance between the inner and outer peripheral sidewalls of the positioning fixture is consistent with the gap, so that the outer peripheral sidewall of the positioning fixture can fit against the inner sidewall of the cavity, thereby enabling the positioning fixture to be positioned at the location of the gap.

4. The positioning fixture as described in claim 2 or 3, characterized in that, The positioning fixture has an anti-interference structure, which is used to prevent the blade body and the cover plate from being damaged by the positioning fixture.

5. The positioning fixture as described in claim 4, characterized in that, The anti-interference structure includes a first chamfer; The first chamfer connects the outer peripheral sidewall and the bottom wall of the positioning fixture, and the first chamfer is used to prevent the blade body from being damaged by the positioning fixture.

6. The positioning fixture as described in claim 4, characterized in that, The anti-interference structure includes a second chamfer; The second chamfer connects the inner peripheral sidewall and the top wall of the positioning fixture, and the second chamfer is used to prevent the cover plate from being damaged by the positioning fixture.

7. The positioning fixture as described in any one of claims 1 to 3, characterized in that, The top wall of the positioning fixture is higher than the surface of the blade body or the surface of the cover plate.

8. A method for assembling an outlet guide vane, characterized in that, Assembly is performed using the positioning fixture as described in any one of claims 1-7; The assembly method includes: The liner is bonded to the cavity of the blade body; The positioning fixture is fixed inside the cavity of the blade body; The cover plate is assembled into the assembly space of the positioning fixture; Remove the positioning fixture and cure the cover plate, the liner plate, and the blade body.

9. An outlet guide vane, characterized in that, The outlet guide vane is assembled using the assembly method described in claim 8.

10. An aircraft engine, the aircraft engine comprising an outer casing, an inner casing, and an outlet guide vane connecting the outer casing and the inner casing; Its features are, The outlet guide vane is the outlet guide vane as described in claim 9.

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