Blade modification method

Abstract

The paddle modification method provided by the present application comprises the following steps: providing a paddle; providing a printing jig, wherein a printing groove is formed in the printing jig; providing ink and filling the ink into the printing groove; transferring the ink to transfer the ink from the printing groove to the paddle; and curing the ink to form a spoiler structure attached to the paddle. The paddle modification method provided by the present application can realize the reprocessing of the produced paddle, reduce the risk of material waste caused by scrapping the produced paddle, produce the paddle with the required aerodynamic performance with the existing mold, reduce the risk of re-opening the mold, and thus reduce the production cost.

Description

Technical Field

[0001] This invention relates to the field of blade processing technology, and in particular to a method for blade modification. Background Technology

[0002] Propeller blades are core components in fields such as aircraft propulsion, wind power generation, industrial ventilation, and ship propulsion. Propeller blades move relative to fluids and interact with them to move under the fluid's influence or drive the fluid's movement. When the blades move relative to the fluid, a boundary layer forms on the blade surface, and flow separation occurs. This flow separation reduces the blade's aerodynamic efficiency, necessitating the inclusion of flow disturbance structures. These structures agitate the fluid passing over the blade surface, suppressing flow separation and improving aerodynamic efficiency. Currently, propeller blades and flow disturbance structures are integrally molded using injection molding or die casting. However, when the blade's aerodynamic performance does not meet requirements, a new mold must be created to adjust the dimensions of the flow disturbance structure, and the existing mold and the defective blades must be scrapped, resulting in high manufacturing costs. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a blade modification method that can reduce production costs.

[0004] This invention provides a method for modifying a propeller blade, the method comprising: providing a propeller blade; providing a printing fixture having a printing groove; providing ink and filling the printing groove with ink; transferring the ink from the printing groove to the propeller blade; and curing the ink to form a turbulence structure attached to the propeller blade.

[0005] The blade modification method provided by the embodiments of the present invention has at least the following beneficial effects: The printing tank can hold ink, and after the ink is transferred from the printing tank to the blade, it can be cured to form a turbulence structure. The blade and the turbulence structure can be integrally molded without the need for a mold. On the one hand, it can reprocess the blades that have already been produced, which can reduce the risk of wasting materials due to the need to scrap the blades. On the other hand, it can be used with existing molds to produce blades with aerodynamic performance that meet the requirements, which can reduce the risk of needing to re-mold and thus reduce production costs.

[0006] In one embodiment of this implementation, the blade modification method includes: A rotor is provided, which has a main shaft and blades. The axial direction of the main shaft intersects the spanwise direction of the blades. Ink is transferred from the printing tank to the axial side of the blades, and the ink is cured so that the ink on the blades forms multiple turbulence structures and the multiple turbulence structures are arranged along the spanwise direction.

[0007] In one embodiment of this implementation, the blade modification method includes: The printing fixture has multiple printing slots of different shapes, and the ink filling the multiple printing slots forms multiple blocks of different shapes in a one-to-one correspondence. The blocks are transferred to the blades and the multiple blocks are arranged along the spanwise direction. In the projection plane perpendicular to the chord direction of the blades, along the direction from the root of the blades to the tip of the blades, the orthographic projection area of ​​the multiple blocks gradually decreases. The blocks are solidified so that the multiple blocks form multiple turbulence structures in a one-to-one correspondence.

[0008] In one embodiment of this implementation, the blade modification method includes: The ink in the printing tank is transferred one by one so that the ink is stacked layer by layer on the blade to form a block. Multiple blocks are formed on the blade along the spanwise direction. The number of stacked layers of multiple blocks gradually decreases along the direction from the root to the tip of the blade. The blocks are solidified so that multiple blocks correspond one-to-one to form multiple turbulence structures. In the projection plane perpendicular to the chord of the blade, along the direction from the root to the tip, the orthographic projection area of ​​multiple turbulence structures gradually decreases.

[0009] In one embodiment of this implementation, the blade modification method includes: The printing fixture has multiple printing slots, which are covered by the blades. The printing slots are distributed along the longitudinal direction, and ink is stacked layer by layer in the printing slots to form blocks within the printing slots. The blocks are then connected to the axial sides of the blades. The number of stacked blocks gradually decreases along the direction from the root to the tip of the blades, and the blocks are solidified so that they correspond one-to-one to form multiple turbulence structures. In the projection plane perpendicular to the chord direction of the blades, the projected area of ​​the multiple turbulence structures gradually decreases along the direction from the root to the tip.

[0010] In one embodiment of this implementation, the blade modification method includes: The blades are surface-treated to improve the adhesion of ink to the blades.

[0011] In one embodiment of this implementation, the ink material comprises a two-component polyurethane.

[0012] In one embodiment of this implementation, the cured ink includes: The ink is heated to cure it.

[0013] In one embodiment of this implementation, the cured ink includes: The ink is cured by UV curing to form a turbulent structure.

[0014] In one embodiment of this implementation, the blade material includes a carbon fiber reinforced epoxy resin matrix composite.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of a blade modification method according to one embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the blade structure; Figure 3 yes Figure 1 A schematic diagram of the propeller blade from another perspective.

[0017] Figure label: Blade 100; Root 11; Tip 12; Suction surface 13; Turbation structure 20; Span 200; Chord 300; Axial 400. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0024] This invention provides a method for modifying a propeller blade 100. Please refer to [link / reference]. Figures 1 to 3 , Figure 1 This is a schematic diagram of a method for modifying the blade 100 according to one embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the blade 100; Figure 3 yes Figure 1 A schematic diagram of the propeller blade 100 from another perspective. The modification methods for the propeller blade 100 include: Step S100: Provide blade 100.

[0025] Step S200: A printing fixture is provided, on which a printing groove is formed.

[0026] Specifically, in some embodiments, the printing fixture includes a gravure plate, and the printing groove is an ink storage groove formed on the gravure plate. The inner contour of the ink storage groove is adapted to the shape of the turbulence structure 20. In other embodiments, the printing fixture is a screen, and the printing groove is a mesh on the screen. The screen has multiple meshes, which are densely arranged to form a mesh array. The contour of the mesh array is adapted to the shape of the turbulence structure 20.

[0027] Step S300: Provide ink and fill the printing tank with ink.

[0028] Step S400: Transfer ink to transfer ink from the printing tank to the paddle 100.

[0029] Specifically, in some embodiments, ink is filled into the ink reservoir of the gravure printing plate. A silicone pad printing head picks up the ink from the ink reservoir and transfers it onto the paddle 100, allowing the ink to adhere to the suction surface 13 of the paddle 100. In other embodiments, a screen is placed over the suction surface 13 of the paddle 100, and ink is filled into the mesh of the screen by a scraping motion, allowing the ink to adhere to the paddle 100 through the mesh.

[0030] Step S500: Curing the ink to form a turbulence structure 20 attached to the blade 100.

[0031] Specifically, the blade 100 is placed in an oven, and the blade 100 and the ink are heated in the oven to cure the ink.

[0032] The blade 100 modification method of the present invention allows the printing tank to hold ink, so that after the ink is transferred from the printing tank to the blade 100, the ink is solidified to form a turbulence structure 20. The blade 100 and the turbulence structure 20 are integrally formed without the need for a mold. On the one hand, it can realize the reprocessing of the already produced blade 100, which can reduce the risk of material waste caused by scrapping the already produced blade 100. On the other hand, it can cooperate with existing molds to produce blades 100 with aerodynamic performance that meet the requirements, which can reduce the risk of needing to re-open the mold, thereby reducing production costs.

[0033] Please see Figures 1 to 3 In one embodiment of this implementation, the method for modifying the blade 100 includes: A rotor is provided, having a main shaft and blades 100, the axial direction 400 of the main shaft intersecting the spanwise direction 200 of the blades 100, transferring ink from a printing tank to the side of the blades 100 along the axial direction 400, curing the ink so that the ink on the blades 100 forms multiple turbulence structures 20, and arranging the multiple turbulence structures 20 along the spanwise direction 200.

[0034] Specifically, the suction surface 13 of the blade 100 is located on the side of the blade 100 along the axial direction 400 of the main shaft. It can be understood that the blade 100 modification method is applicable to the rotor of UAVs. The rotor modification method can be used to improve the aerodynamic performance of mass-produced UAV rotor products and can be used to repair and maintain the spoiler structure 20 of the rotor that has been damaged during use.

[0035] Please see Figures 1 to 3 In one embodiment of this implementation, the method for modifying the blade 100 includes: The printing fixture has multiple printing slots of different shapes, and the ink filling the multiple printing slots forms multiple blocks of different shapes in a one-to-one correspondence. The blocks are transferred to the blade 100 and the multiple blocks are arranged along the spanwise direction 200. In the projection plane perpendicular to the chordwise direction 300 of the blade 100, along the direction from the root 11 of the blade 100 to the tip 12 of the blade 100, the orthographic projection area of ​​the multiple blocks gradually decreases, and the blocks are solidified so that the multiple blocks form multiple turbulence structures 20 in a one-to-one correspondence.

[0036] Specifically, in some embodiments, multiple printing grooves are arranged on the surface of the gravure plate. The depths of the multiple printing grooves are different, and the depths gradually decrease in the arrangement direction of the multiple printing grooves. Ink is filled into the multiple printing grooves, and the ink is constrained by the inner walls of the multiple printing grooves to form multiple blocks. The outer contour of the blocks matches the inner contour of the printing grooves. The height of the multiple blocks gradually decreases in the arrangement direction of the multiple printing grooves. The blocks are sequentially transferred to the paddle 100 by the transfer head, so that the multiple blocks are arranged along the spanwise direction 200. In the projection plane perpendicular to the chordwise direction 300, along the direction from the root 11 to the tip 12, the dimensions of the multiple blocks in the axial direction 400 of the main shaft gradually decrease. After the blocks are solidified, in the projection plane perpendicular to the chordwise direction 300, along the direction from the root 11 to the tip 12, the dimensions of the multiple turbulence structures 20 formed in the axial direction 400 gradually decrease.

[0037] Understandably, the rotor's main shaft can drive the blades 100 to rotate along an axis parallel to the main shaft's axial direction 400. When the blades 100 rotate, the linear velocities of the different parts of the blades 100 distributed along the spanwise direction 200 are different. In the projection plane perpendicular to the chordwise direction 300 of the blades 100, along the direction from the root 11 of the blades 100 to the tip 12 of the blades 100, the orthographic projection area of ​​multiple blocks gradually decreases. This allows the size of the multiple turbulence structures 20 formed and distributed in various parts of the blades 100 to be adapted to the linear velocity of the blades 100, so as to adjust the disturbance intensity of the turbulence structures 20 on the fluid. This reduces the risk of the blades 100 becoming unstable due to excessive surface friction coefficient of the turbulent boundary layer formed on the local surface of the blades 100, and is beneficial to improving the aerodynamic efficiency of the blades 100.

[0038] It should be understood that in some other embodiments, the widths of the multiple printing grooves are different, and the widths of the multiple printing grooves gradually decrease in the arrangement direction of the multiple printing grooves, so as to form multiple blocks with different widths. After the blocks are solidified, in the projection plane perpendicular to the chord direction 300, along the direction from the root 11 to the tip 12, the dimensions of the multiple turbulence structures 20 formed in the spanwise direction 200 gradually decrease.

[0039] Please see Figures 1 to 3 In one embodiment of this implementation, the method for modifying the blade 100 includes: The ink in the printing tank is transferred one by one so that the ink is stacked layer by layer on the blade 100 to form a block, and multiple blocks are formed on the blade 100 along the spanwise direction 200. In the direction from the root 11 of the blade 100 to the tip 12 of the blade 100, the number of stacked layers of the multiple blocks gradually decreases, and the blocks are solidified so that multiple blocks correspond one-to-one to form multiple turbulence structures 20. In the projection plane perpendicular to the chord 300 of the blade 100, in the direction from the root 11 to the tip 12, the orthogonal projection area of ​​the multiple turbulence structures 20 gradually decreases.

[0040] Specifically, the ink in the printing tank is transferred multiple times by the pad printing head. In each transfer, the pad printing head picks up a preset amount of ink from the printing tank and transfers it to the paddle 100. During multiple transfers, the pad printing head can stack ink on top of the ink transferred to the paddle 100 in the next transfer, so that multiple layers of preset ink are stacked layer by layer on the paddle 100 to form a block. The ink is sequentially transferred to various positions along the span 200 of the paddle 100 by the pad printing head to form multiple blocks distributed along the span 200. Different blocks are formed by different transfers, and multiple blocks are formed by stacking preset amounts of ink with different numbers of layers, so that the heights of the multiple blocks are different. After the blocks are solidified, in the projection plane perpendicular to the chord 300 of the paddle 100, along the direction from the root 11 to the tip 12, the dimensions of multiple turbulence structures 20 gradually decrease in the axial direction 400.

[0041] Understandably, this setup allows the dimensions of multiple turbulence structures 20 to be adapted to the linear velocity of the blade 100, while reducing the manufacturing difficulty of the printing fixture and improving the economic efficiency of the blade 100 modification method.

[0042] Please see Figures 1 to 3 In one embodiment of this implementation, the method for modifying the blade 100 includes: The printing fixture has multiple printing slots, with the blade 100 covering the printing slots and the multiple printing slots distributed along the spanwise direction 200. Ink is stacked layer by layer in the printing slots so that the ink forms blocks in the printing slots and the blocks are connected to the side of the blade 100 along the axial direction 400. Along the direction from the root 11 of the blade 100 to the tip 12 of the blade 100, the number of stacked layers of the multiple blocks gradually decreases, and the blocks are solidified so that the multiple blocks correspond one-to-one to form multiple turbulence structures 20. In the projection plane perpendicular to the chordwise direction 300 of the blade 100, along the direction from the root 11 to the tip 12, the orthographic projection area of ​​the multiple turbulence structures 20 gradually decreases.

[0043] Specifically, in some embodiments, a screen is used as a printing fixture. The multiple mesh groups on the screen are divided into multiple groups. Multiple meshes in one group are used to cooperate in forming ink into a block. The screen is covered on the blade 100 so that the multiple groups of meshes are arranged along the longitudinal direction 200, and the blade 100 covers the multiple mesh groups. The meshes are printed multiple times by a squeegee. In one squeegee, the squeegee can fill the mesh with a preset amount of ink. In multiple squeegees, the squeegee can stack ink on the ink filled into the mesh in the previous squeegee in the next squeegee, so that multiple layers of preset amount of ink are stacked layer by layer in the mesh to form a block, and the block is in contact with the blade 100 covering the screen. By gradually decreasing the number of squeegees applied to multiple sets of meshes distributed along the span 200, and by stacking blocks of different numbers of preset amounts of ink in the multiple sets of meshes distributed along the span 200, so that the heights of the multiple blocks are different, after the blocks are cured, in the projection plane perpendicular to the blade 100 in the chord 300, along the direction from the root 11 to the tip 12, the dimensions of the multiple turbulence structures 20 gradually decrease in the axial direction 400.

[0044] Understandably, this setup allows for adjustment of the height of the resulting turbulence structure 20 by changing the number of squeegees, thereby reducing the structural size requirements of the screen and simplifying the screen manufacturing process, which is beneficial to improving the economic efficiency of the blade 100 modification method.

[0045] It should be understood that, in some embodiments, during the manufacturing process of the screen, a thicker photosensitive adhesive layer is applied to some parts of the screen and a thinner photosensitive adhesive layer is applied to other parts of the screen. After the photosensitive adhesive layer is cured, it can form multiple sets of mesh holes with different depths with the screen. When the screen is covered on the blade 100, the multiple sets of mesh holes are distributed along the longitudinal direction. Along the direction from the root 11 to the tip 12, the depth of the multiple sets of mesh holes gradually decreases. The user can fill the multiple sets of mesh holes with ink in one printing and form multiple blocks with gradually decreasing height along the longitudinal direction. After the multiple blocks are cured to form the turbulence structure 20, the size of the multiple turbulence structures 20 gradually decreases in the axial direction 400 along the direction from the root 11 to the tip 12.

[0046] Please see Figures 1 to 3 In one embodiment of this implementation, the method for modifying the blade 100 includes: The blade 100 is surface treated to improve the adhesion of ink to the blade 100.

[0047] Specifically, the surface of the blade 100 is cleaned with an organic solvent, subjected to atmospheric pressure air plasma treatment, subjected to corona treatment, and a primer is applied to the surface of the blade 100 to complete the surface treatment process.

[0048] It is understandable that by surface treating the blade 100 to improve the adhesion of ink to the blade 100, on the one hand, the risk of ink shifting or slipping off before the ink on the blade 100 is cured can be reduced, and on the other hand, it is beneficial to improve the stability of the connection between the cured turbulence structure 20 and the blade 100.

[0049] Please see Figures 1 to 3 In one embodiment of this implementation, the ink material comprises a two-component polyurethane.

[0050] Specifically, the ink is a two-component polyurethane ink. This configuration improves the structural strength of the turbulence structure 20 formed by the curing of the ink.

[0051] Please see Figures 1 to 3 In one embodiment of this implementation, the cured ink includes: The ink is heated to cure it.

[0052] Specifically, after transferring the ink from the printing chamber to the paddle 100, the paddle 100 is placed in an oven at 80℃-90℃ for 20 minutes for heat curing. This setup helps improve the adaptability of the paddle 100 modification method to thermosetting inks.

[0053] Please see Figures 1 to 3 In one embodiment of this implementation, the cured ink includes: The ink is cured by UV curing to form a turbulence structure 20.

[0054] Specifically, after the ink in the printing chamber is transferred to the blade 100, the ink on the blade 100 is irradiated with a UV light source with a wavelength of 395nm for 3-10 seconds to cure the ink into a turbulence structure 20 on the blade 100. This setup helps improve the adaptability of the blade 100 modification method to UV-cured inks.

[0055] Please see Figures 1 to 3 In one embodiment of this implementation, the blade 100 is made of carbon fiber reinforced epoxy resin-based composite material.

[0056] Understandably, the material of the blade 100 includes carbon fiber reinforced epoxy resin matrix composite material. On the one hand, this helps to reduce the weight of the blade 100 and improve its efficiency. On the other hand, it can improve the adhesion effect of the turbulence structure 20 to the blade 100 after curing.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A method for modifying a propeller blade, characterized in that, include: Provide blades; A printing fixture is provided, wherein a printing groove is provided on the printing fixture; Provide ink and fill the printing tank with the ink; Transfer the ink to transfer it from the printing tank to the paddle; The ink is cured to form a turbulence structure that adheres to the blade.

2. The blade modification method according to claim 1, characterized in that, The blade modification method includes: A rotor is provided having a main shaft and blades, the axial direction of the main shaft intersecting the spanwise direction of the blades, transferring ink from the printing tank to the side of the blades along the axial direction, curing the ink so that the ink on the blades forms a plurality of the turbulence structures, and arranging the plurality of turbulence structures along the spanwise direction.

3. The blade modification method according to claim 2, characterized in that, The blade modification method includes: The printing fixture has multiple printing grooves of different shapes, and the ink filled in the multiple printing grooves forms multiple blocks of different shapes in a one-to-one correspondence. The blocks are transferred to the blade, and the multiple blocks are arranged along the spanwise direction. In the projection plane perpendicular to the chord direction of the blade, along the direction from the root of the blade to the tip of the blade, the orthographic projection area of ​​the multiple blocks gradually decreases. The blocks are solidified so that the multiple blocks form multiple turbulence structures in a one-to-one correspondence.

4. The blade modification method according to claim 2, characterized in that, The blade modification method includes: The ink in the printing tank is transferred sequentially so that the ink is stacked layer by layer on the blade to form a block, and multiple blocks are formed on the blade along the spanwise direction. The number of stacked layers of the multiple blocks gradually decreases along the direction from the root of the blade to the tip of the blade. The blocks are solidified so that the multiple blocks correspond one-to-one to form multiple turbulence structures. In the projection plane perpendicular to the chord direction of the blade, along the direction from the root to the tip, the projected area of ​​the multiple turbulence structures gradually decreases.

5. The blade modification method according to claim 2, characterized in that, The blade modification method includes: The printing fixture has multiple printing slots, which are covered by the blades and distributed along the longitudinal direction. The ink is stacked layer by layer in the printing slots to form blocks within them. These blocks are then connected to the axial side of the blades. The number of stacked blocks gradually decreases along the direction from the root to the tip of the blades, and the blocks are solidified so that they correspond one-to-one to form multiple turbulence structures. In a projection plane perpendicular to the chord direction of the blades, the projected area of ​​the multiple turbulence structures gradually decreases along the direction from the root to the tip.

6. The blade modification method according to claim 1, characterized in that, The blade modification method includes: The blades are surface-treated to improve the adhesion of the ink to the blades.

7. The blade modification method according to claim 1, characterized in that, The ink is made of a two-component polyurethane.

8. The blade modification method according to claim 1, characterized in that, The curing of the ink includes: The ink is heated to cure it.

9. The blade modification method according to claim 1, characterized in that, The curing of the ink includes: The ink is cured by UV curing to form the turbulence structure.

10. The blade modification method according to claim 1, characterized in that, The blades are made of carbon fiber reinforced epoxy resin-based composite material.

Images