Composite material blade with anti-twist structure and method of mounting thereof

Abstract

The application discloses a composite material blade with a torsion prevention structure and a mounting method thereof, and belongs to the technical field of compressor equipment. The composite material blade comprises a blade mold pressing assembly, upper and lower cushion blocks and a torsion preform. The upper and lower cushion blocks are respectively attached to the upper and lower surfaces of the blade mold pressing assembly, and the torsion preform is sleeved on the outer periphery of the upper and lower cushion blocks. The outer peripheral surface formed by the upper and lower cushion blocks is in an elliptical shape, the inner ring of the torsion preform is also in an elliptical shape, and the torsion preform is provided with a torsion prevention plane. The application can effectively prevent the blade from rotating and can conveniently adjust the installation angle of the blade.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor equipment, in particular to a composite blade with anti-twist structure and a mounting method thereof. BACKGROUND

[0002] Blades are commonly used in fan blades, engine blades, wind power blades, propeller blades, and compressor blades, etc. The most common fan blades are used for household and industrial purposes, which are usually made of plastic and metal materials, and are formed by injection molding and stamping. Engine and propeller blades were initially made of alloy materials, and in recent years have begun to be formed by composite materials. Compressor blades, especially low-temperature compressor blades, were initially made of low-temperature resistant alloy steel by smelting and casting, and later made of carbon fiber composite materials.

[0003] In the prior art, the blade is mounted on the hub; the compressor works at a high rotating speed during rotation, and the blade will bear the superimposed torsion trend of the aerodynamic torque and the centrifugal torque during rotation. How to effectively prevent the blade from rotating and meet the requirements of adjustable blade installation angle (which needs to be adjusted) is urgent to be solved. SUMMARY

[0004] In view of the deficiencies in the prior art, the present application provides a composite blade with an anti-twist structure and a mounting method thereof, which can effectively prevent the blade from rotating and conveniently adjust the blade installation angle.

[0005] The purpose of the present application is achieved by a composite blade with an anti-twist structure, comprising a blade mold pressing assembly, an upper pad, a lower pad, and a torsion preform. The upper pad and the lower pad are respectively attached to the upper and lower surfaces of the blade mold pressing assembly, and the torsion preform is sleeved around the outer periphery of the upper pad and the lower pad. The outer periphery formed by the upper pad and the lower pad is elliptical, the inner circle of the torsion preform is also elliptical, and the torsion preform is provided with an anti-twist plane.

[0006] As a preferred technical solution of the composite blade with an anti-twist structure, the upper pad comprises an upper pad portion and an upper anti-twist portion. The outer surface of the upper pad portion is arc-shaped, and the inner surface of the upper pad portion is a conformal surface of the upper surface of the blade mold pressing assembly. The outer surface of the upper anti-twist portion is semi-elliptical, and the inner surface of the upper anti-twist portion is semi-circular.

[0007] As a preferred technical solution of the composite blade with an anti-twist structure, the lower pad comprises a lower pad portion and a lower anti-twist portion. The outer surface of the lower pad portion is arc-shaped, and the inner surface of the lower pad portion is a conformal surface of the lower surface of the blade mold pressing assembly. The outer surface of the lower anti-twist portion is semi-elliptical, and the inner surface of the lower anti-twist portion is semi-circular.

[0008] As a preferred technical scheme of the composite blade with the anti-twist structure, the upper gasket part, the lower gasket part and the partial blade mold pressing assembly jointly form a circular surface; the upper anti-twist part and the lower anti-twist part jointly form an elliptical surface, and the two side edges of the upper anti-twist part and the lower anti-twist part are butted together, so that the overall outer periphery forms an elliptical surface.

[0009] As a preferred technical scheme of the composite blade with the anti-twist structure, the torsion preform comprises an anti-twist part and a sleeve part, the sleeve part is sleeved on the outer periphery of the upper gasket and the lower gasket, and the anti-twist part is provided with an anti-twist plane.

[0010] As a preferred technical scheme of the composite blade with the anti-twist structure, the angle adjusting gasket comprises a first fitting surface and a second fitting surface, an angle is formed between the first fitting surface and the second fitting surface, the first fitting surface is used to fit the mounting surface of the mounting device, and the second fitting surface is used to fit the anti-twist plane of the torsion preform; the mounting angle of the composite blade is adjusted by selecting the angle adjusting gasket with different angles of the first fitting surface and the second fitting surface.

[0011] As a preferred technical scheme of the composite blade with the anti-twist structure, the angle adjusting gasket adopts a wedge-shaped block, the first fitting surface and the second fitting surface are respectively the top surface and the bottom surface of the wedge-shaped block, and the side surface of the wedge-shaped block is provided with a mounting hole, and a screw is arranged in the mounting hole.

[0012] A composite blade mounting method comprises the following steps:

[0013] Step 1) mounting the composite blade with the anti-twist structure on a dynamic balancing tool, and the dynamic balancing tool is provided with a simulated hub mounting surface;

[0014] Step 2) placing an angle adjusting gasket between the torsion preform and the dynamic balancing tool, so as to adjust the mounting angle of the composite blade;

[0015] Step 3) performing dynamic balancing test on the composite blade, replacing the angle adjusting gasket with different angles according to the test result, and obtaining the angle adjusting gasket with the best cooperation with the composite blade through multiple tests;

[0016] Step 4) mounting the composite blade and the corresponding angle adjusting gasket into the hub.

[0017] As a preferred technical scheme of the composite blade mounting method, the hub mounting surface in step 1) comprises a blade middle part handle circular surface, a blade rear end blade root circular surface and a torsion preform fitting surface.

[0018] As a preferred technical scheme of the composite blade mounting method, step 4) is specifically:

[0019] Step 4-1) corresponds to the mounting of the blade handle part of the composite blade on the hub;

[0020] Step 4-2) installs the angle adjusting pad between the torsion preform and the hub, and ensures that the two end faces of the angle adjusting pad are respectively attached to the anti-torsion planes of the hub and the torsion preform.

[0021] In summary, due to the adoption of the above technical scheme, the beneficial effects of the present application are:

[0022] The present application changes the traditional installation angle adjustment and anti-torsion mode (such as bolt fixing, positioning pin fixing, gluing and the like) to a more flexible split structure, and increases the structure anti-torsion while adjusting the angle, thereby improving the anti-torsion ability and the convenience of angle adjustment; and the present blade is made of composite material, thereby reducing the overall weight of the blade. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a schematic view of the composite blade structure in the present application;

[0024] Figure 2 is an exploded view of the composite blade in the present application;

[0025] Figure 3 is Figure 2 a combined schematic view;

[0026] Figure 4 is a schematic view of the upper pad structure in the present application;

[0027] Figure 5 is a schematic view of the lower pad structure in the present application;

[0028] Figure 6 is a schematic view of the torsion preform structure in the present application;

[0029] Figure 7 is an end view of the torsion preform in the present application;

[0030] Figure 8 is a schematic view of the angle adjusting pad structure in the present application;

[0031] Figure 9 is a schematic view of the composite blade mounted on the dynamic balancing tool in the present application;

[0032] Figure 10 is a schematic view of the composite blade mounted on the hub in the present application;

[0033] Marked in the figure: 100, blade mold pressing assembly; 101, middle part of blade; 102, rear end of blade; 200, upper pad; 201, upper pad part; 202, upper anti-twist part; 300, lower pad; 301, lower pad part; 302, lower anti-twist part; 400, torsion preform; 401, anti-twist part; 401a, anti-twist plane; 402, sleeve part; 500, angle adjusting pad; 501, first fitting surface; 502, second fitting surface; 600, dynamic balance tool. DETAILED DESCRIPTION

[0034] All features disclosed in this specification, and / or all steps of any methods or processes disclosed in this specification, can be combined in any combination, except combinations where at least some of the features and / or steps are mutually exclusive.

[0035] Any feature in the present specification, including any accompanying claims, abstract, and drawings, can be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, unless expressly stated otherwise, every feature disclosed in the present specification is one example only of a generic series of equivalent or similar features.

[0036] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a predetermined orientation, be constructed and operated in a predetermined orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0038] Example 1

[0039] As Figures 1-8 shown, the present application provides a technical solution:

[0040] A composite blade with an anti-twist structure, comprising a blade mold pressing assembly 100, an upper pad 200, a lower pad 300, and a torsion preform 400, the upper pad 200 and the lower pad 300 are respectively fitted on the upper and lower surfaces of the blade mold pressing assembly 100, the torsion preform 400 is sleeved on the outer periphery of the upper pad 200 and the lower pad 300, the outer periphery formed by the upper pad and the lower pad 300 is elliptical, the inner ring of the torsion preform 400 is also elliptical, and the torsion preform 400 is provided with an anti-twist plane 401a.

[0041] Specifically, the blade module is made by the process in the background technology, the upper pad 200, the lower pad 300 and the torsion preform 400 are also made of composite materials, the upper pad 200 and the lower pad 300 are attached to the blade mold pressing assembly 100, and the torsion preform 400 is sleeved. Since the attachment surfaces of the torsion preform 400 and the upper pad 200 and the lower pad 300 are all elliptical (theoretically, the structure shape is not limited to an ellipse, but also can be a special shape), the rotation of the torsion preform 400 is limited, so the rotation of the blade is limited to the torsion preform 400, and the torsion preform 400 is provided with an anti-torsion plane 401a, so as to limit the rotation of the entire blade by limiting the rotation of the anti-torsion plane 401a.

[0042] Further, the upper pad 200 includes an upper pad portion 201 and an upper anti-torsion portion 202, the outer surface of the upper pad portion 201 is arc-shaped, the inner surface of the upper pad portion 201 is a conformal surface of the upper surface of the blade mold pressing assembly 100, the outer surface of the upper anti-torsion portion 202 is a semi-elliptical surface, and the inner surface of the upper anti-torsion portion 202 is a semicircular surface; the lower pad 300 includes a lower pad portion 301 and a lower anti-torsion portion 302, the outer surface of the lower pad portion 301 is arc-shaped, the inner surface of the lower pad portion 301 is a conformal surface of the lower surface of the blade mold pressing assembly 100, the outer surface of the lower anti-torsion portion 302 is a semi-elliptical surface, and the inner surface of the lower anti-torsion portion 302 is a semicircular surface.

[0043] Specifically, the upper pad portion 201, the lower pad portion 301 and part of the blade mold pressing assembly 100 jointly form a circular surface; the upper anti-torsion portion 202 and the lower anti-torsion portion 302 jointly form an elliptical surface, and the two side edges of the upper anti-torsion portion 202 and the lower anti-torsion portion 302 are butted together, so that the overall outer periphery forms an elliptical surface.

[0044] It should be noted that the upper pad portion 201 and the lower pad portion 301 are used to make the front end of the blade petiole into a circular surface to facilitate installation, and the conformal surface design facilitates the formation of the overall structure and ensures the strength; the upper anti-torsion portion 202 and the lower anti-torsion portion 302 are used to make the rear end of the blade petiole into an ellipse to facilitate the installation of the torsion preform 400, and the direct formation of the elliptical surface by the upper anti-torsion portion 202 and the lower anti-torsion portion 302 can ensure the standard of the surface and provide a higher-precision attachment surface for the torsion preform 400.

[0045] Further, the torsion preform 400 includes an anti-torsion portion 401 and a sleeve portion 402, the sleeve portion 402 is sleeved on the outer periphery of the upper pad 200 and the lower pad 300, and the anti-torsion portion 401 is provided with an anti-torsion plane 401a.

[0046] Specifically, the inner ring of the sleeve part 402 is an oval structure, which is also a conformal surface to facilitate installation; and the oval matching structure can make the torsion preform 400 and the leaf stalk more stable in addition to the adhesive preventing loosening.

[0047] It should be noted that the torsion preform 400 is an integrally formed structure to ensure strength, and the anti-torsion plane 401a can be machined to ensure flatness.

[0048] Further, the angle adjusting pad 500 is also included, which includes a first fitting surface 501 and a second fitting surface 502, and an angle is formed between the first fitting surface 501 and the second fitting surface 502. The first fitting surface 501 is used to fit the mounting surface of the installation equipment, and the second fitting surface 502 is used to fit the anti-torsion plane 401a of the torsion preform 400. The mounting angle of the composite blade is adjusted by selecting angle adjusting pads with different angles of the first fitting surface 501 and the second fitting surface 502.

[0049] Specifically, the angle adjusting pad 500 is a separate structure from the blade and is independent of the blade, and is used in cooperation with the blade for installation. In this embodiment, the angle adjusting pad 500 can be a wedge-shaped block, and the first fitting surface 501 and the second fitting surface 502 are respectively the top surface and the bottom surface of the wedge-shaped block. Meanwhile, the side surface of the wedge-shaped block is provided with a mounting hole, and a screw is arranged in the mounting hole to facilitate fixing of the wedge-shaped block after installation. In actual use, wedge-shaped blocks with different angles can be prepared in advance for adaptation.

[0050] It should be noted that in use, the angle adjusting pad 500 is installed between the torsion preform 400 and the installation equipment (dynamic balancing tool 600 or hub) to limit the rotation of the blade and adjust the angle (different angle adjusting pads 500 with different angles).

[0051] Embodiment 2

[0052] As shown in Figures 9-10 , a composite blade installation method includes the following steps:

[0053] Step 1) Install the composite blade with the anti-torsion structure on the dynamic balancing tool 600, as shown in Figure 9 , the dynamic balancing tool 600 is provided with a simulated hub mounting surface, and the hub mounting surface includes a blade middle part 101 leaf stalk circumferential surface, a blade rear end 102 blade root circumferential surface, and a torsion preform 400 fitting surface.

[0054] Step 2) Place the angle adjusting pad 500 between the torsion preform 400 and the dynamic balancing tool 600 to adjust the installation angle of the composite blade.

[0055] Step 3) performing dynamic balance test on the composite blade, replacing the angle adjusting pad 500 of different angle according to the test result, and obtaining the angle adjusting pad 500 best matched with the composite blade through multiple tests;

[0056] Step 4) assembling the composite blade and the corresponding angle adjusting pad 500 into the hub, specifically:

[0057] Step 4-1) assembling the shank part of the composite blade into the hub;

[0058] Step 4-2) assembling the angle adjusting pad 500 between the torsion preform 400 and the hub, and ensuring that the two end faces of the angle adjusting pad 500 are respectively attached to the anti-twist plane 401a of the hub and the torsion preform 400.

[0059] It should be noted that the middle shank circumferential surface of the blade and the rear end blade root circumferential surface of the blade are used to ensure the accuracy of the axial installation; the rear end blade root circumferential surface of the blade cooperates with the blade root to limit the axial displacement of the blade; and the attached surface of the torsion preform 400 is used to adjust the installation angle and limit the rotation of the blade after adjustment.

[0060] The angle adjusting pad 500 can be designed in advance, that is, the distance between the torsion preform 400 and the installation equipment should be considered.

[0061] The combination of the angle adjusting pad 500 and the torsion preform 400 not only prevents the torsion of the blade from the structure, but also realizes the convenience of angle adjustment.

[0062] Compared with the design of the adjustable structure, the angle adjusting pad 500 of the overall structure has higher reliability and stability.

[0063] The above only describes the preferred embodiments of the present application and should not be used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A composite blade with anti-twist structure, comprising a blade mould pressing assembly (100), an upper pad (200), a lower pad (300) and a torsion preform (400), the upper pad (200) and the lower pad (300) are respectively attached to the upper and lower surfaces of the blade mould pressing assembly (100), and the torsion preform (400) is sleeved on the outer periphery of the upper pad (200) and the lower pad (300), characterized in that, The outer peripheral surface of the upper pad (200) and the lower pad (300) is elliptical, and the inner ring of the torsion preform (400) is also elliptical. The torsion preform (400) is provided with an anti-torsion plane (401a). It also includes an angle adjustment pad (500), which includes a first mating surface (501) and a second mating surface (502). An angle is formed between the first mating surface (501) and the second mating surface (502). The first mating surface (501) is used to fit the mounting surface of the installation equipment, and the second mating surface (502) is used to fit the anti-torsion plane (401a) of the torsion preform (400). The installation angle of the composite material blade is adjusted by selecting adjustment pads with different angles of the first mating surface (501) and the second mating surface (502).

2. The composite blade with anti-twist structure according to claim 1, characterized in that, The upper pad (200) includes an upper pad part (201) and an upper anti-torsion part (202). The outer surface of the upper pad part (201) is arc-shaped, and the inner surface of the upper pad part (201) is a conformal surface of the upper surface of the blade molding assembly (100). The outer surface of the upper anti-torsion part (202) is a semi-elliptical surface, and the inner surface of the upper anti-torsion part (202) is a semi-circular surface.

3. The composite blade with anti-twist structure according to claim 2, characterized in that, The lower pad (300) includes a lower pad part (301) and a lower anti-torsion part (302). The outer surface of the lower pad part (301) is arc-shaped, and the inner surface of the lower pad part (301) is a conformal surface of the lower surface of the blade molding assembly (100). The outer surface of the lower anti-torsion part (302) is a semi-elliptical surface, and the inner surface of the lower anti-torsion part (302) is a semi-circular surface.

4. The composite blade with anti-twist structure according to claim 3, characterized in that, The upper pad (201), the lower pad (301), and part of the blade molding assembly (100) together form a circular surface; the upper anti-torsion part (202) and the lower anti-torsion part (302) together form an elliptical surface, and the two sides of the upper anti-torsion part (202) and the lower anti-torsion part (302) are joined together, so that the overall outer periphery forms an elliptical surface.

5. The composite blade with anti-twist structure according to claim 1 or 2, characterized in that, The torsion preform (400) includes an anti-torsion part (401) and a sleeve part (402). The sleeve part (402) is sleeved on the outer periphery of the upper pad (200) and the lower pad (300). The anti-torsion part (401) is provided with an anti-torsion plane (401a).

6. The composite blade with anti-twist structure according to claim 1, characterized in that, The angle adjustment pad (500) is a wedge-shaped block. The first contact surface (501) and the second contact surface (502) are the top and bottom surfaces of the wedge-shaped block, respectively. The wedge-shaped block has mounting holes on its side, and screws are installed in the mounting holes.

7. A method of mounting a composite blade according to any one of claims 1 to 6, characterised in that, Includes the following steps: Step 1) Install the composite material blade with anti-torsion structure onto the dynamic balancing fixture (600), which has a simulated hub mounting surface. Step 2) Place an angle adjustment pad (500) between the torsion preform (400) and the dynamic balancing fixture (600) to adjust the installation angle of the composite material blade; Step 3) Perform dynamic balancing tests on the composite blades. Replace the angle adjustment pads (500) with different angles according to the test results. Through multiple tests, obtain the angle adjustment pads (500) that best match the composite blades. Step 4) The composite blade is installed into the hub with the corresponding angle adjustment pad (500).

8. A method of mounting a composite blade according to claim 7, wherein, The hub installation surface in step 1) includes the middle blade (101) shank circumferential surface, the rear blade (102) root circumferential surface, and the torsion preform (400) fitting surface.

9. A method of mounting a composite blade according to claim 8, wherein, Step 4) is specifically: Step 4-1) The shank part of the composite blade is installed into the hub; Step 4-2) The angle adjustment pad (500) is installed between the torsion preform (400) and the hub, and the two end surfaces of the angle adjustment pad (500) are respectively fitted on the anti-torsion flat surface (401a) of the hub and the torsion preform (400).

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