A new type of wind turbine blade

Abstract

A novel wind power generation blade includes a blade shell and a support tube, wherein the blade shell includes a plurality of panels; the panels of the blade shell are connected to the outer wall of the support tube. The present invention can improve the overall strength of the support tube, thereby improving the overall strength of the blade; on the other hand, it can achieve lightweight, and greatly improve aerodynamic efficiency by designing the structure of the blade shell.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, in particular to a novel wind power generation blade. Background Art

[0002] The blade is one of the key components of a wind turbine. It rotates mainly through the wind speed of natural wind, and the kinetic energy of the blade rotation turns the generator to generate electricity. Existing blades are usually made of materials such as fiberglass, and the blades are formed by mold processing. On the one hand, the manufacturing process and mold processing costs are high, and the blade shell needs to be designed into a curved surface, which is difficult to design. On the other hand, the use of materials such as fiberglass is heavy and the size cannot be designed larger. Moreover, when it becomes waste, it is not easy to degrade, and glass fiber is harmful to the human body.

[0003] In addition, the existing blade shell usually has a round tube in the inner cavity of the shell to increase the strength of the blade, but this will cause a weak point in the connection of the round tube, causing the support tube to deform; and because the thickness of the blade shell is usually larger than the round tube, the diameter of the support tube will be smaller and the strength will be lower, thereby reducing the overall strength of the blade.

[0004] Furthermore, the existing blades cannot be arbitrarily transformed into blades of different sizes, and the assembly is inflexible. Blades of different sizes and powers need to be redesigned, which greatly increases the cost. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a new type of wind power generation blade with high strength, light weight, reduced cost and high wind efficiency.

[0006] The technical solution of the present invention is: a new type of wind power generation blade, comprising a blade shell and a support tube, the blade shell comprising a plurality of panels; the panels of the blade shell are connected to the outer wall of the support tube.

[0007] Furthermore, adjacent panels on at least one side of the blade shell are connected into one piece at the end away from the support tube through an arc-shaped connecting plate.

[0008] Furthermore, adjacent panels on at least one side of the blade shell are staggeredly connected at the end away from the support tube, so that a portion of a panel extends outward along the connection.

[0009] Furthermore, the rear end of the extended panel is provided with a convex portion with a pointed or arc-shaped structure.

[0010] Furthermore, a bent connecting plate is provided between the adjacent panels and the arc-shaped connecting plate.

[0011] Furthermore, the panel is connected to the outer wall of the support tube via a mounting plate.

[0012] Furthermore, the panel is a flat sandwich panel.

[0013] Furthermore, the blade shell and the support tube are both segmented structures, including a blade root segment, a blade mid-segment and a blade tip segment; a connecting joint is provided at the front end of the blade root segment; and segmented joints are provided at the connection between adjacent segments.

[0014] Furthermore, the support tube is a conical tube structure.

[0015] Furthermore, the panel is made of stainless steel sandwich material.

[0016] The beneficial effects of the present invention are as follows: on the one hand, the overall strength of the support tube can be improved, thereby improving the overall strength of the blade; on the other hand, lightweight is achieved, and the aerodynamic efficiency is greatly improved by designing the structure of the blade shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A cross-sectional view taken along the line AA of the embodiment shown;

[0019] Figure 3 yes Figure 1 A BB sectional view of the embodiment shown;

[0020] Figure 4 yes Figure 1 A CC sectional view of the embodiment shown;

[0021] Figure 5 yes Figure 1 A DD sectional view of the embodiment shown;

[0022] Figure 6 yes Figure 1 An enlarged schematic diagram of part I of the illustrated embodiment;

[0023] Figure 7 yes Figure 3 An enlarged schematic diagram of part II of the illustrated embodiment;

[0024] Figure 8 yes Figure 3 An enlarged schematic diagram of part III of the illustrated embodiment.

[0025] Description of the accompanying drawings:

[0026] 1. Blade shell; 2. Support tube; 3. Panel; 4. Reinforcement ribs; 5. Connecting joint; 6. Closing plate; 7. Segmented joint; 8. Arc-shaped connecting plate; 9. Protrusion; 10. Bent connecting plate; 11. Blade root section; 12. Blade middle section; 13. Blade tip section; 14. Notch; 21. Mounting plate; 31. Filling plate. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 to Figure 8 As shown: a new type of wind power generation blade includes a blade shell 1 and a support tube 2. The blade shell 1 includes a plurality of panels 3; the panels 3 of the blade shell 1 are connected to the outer wall of the support tube 2.

[0029] The above scheme has the following advantages: by connecting the panel of the blade shell to the outer wall of the support tube instead of connecting the support tube to the inner cavity of the blade shell, on the one hand, because the support tube is wrapped by the blade shell, there will be weak points in the connection part, which may easily cause the support tube to deform. The design structure of the present invention can prevent the support tube from deforming and improve the overall stability of the blade; on the other hand, because the thickness of the blade shell is usually larger than that of the support tube, the diameter of the support tube will be smaller and the strength will be lower. The design structure of the present invention can improve the strength of the support tube.

[0030] Specifically, the blade shell 1 with the support tube 2 includes a blade root section 11, a blade middle section 12 and a blade tip section 13, and the blade shell 1 is a segmented structure, which is convenient for transportation and assembly. Each section of the blade shell 1 is formed by splicing at least four panels 3. Preferably, the panel 3 is a sandwich panel, which can achieve lightweight while ensuring strength; and the lighter the blade, the easier it is to be blown by the wind to rotate and generate electricity, that is, breeze can generate electricity, and the annual number of power generation hours is greatly increased. In addition, the light weight allows the blade size to be made larger. In addition, the panel is a flat sandwich panel, which is not only convenient for transportation, but also easier to manufacture, and the cost is greatly reduced compared to the existing curved panel body. It can be said that this embodiment uses lightweight materials to manufacture blades, while overcoming the shape limitations of the material itself.

[0031] The sandwich panel of this embodiment includes a plate layer, a sandwich layer, and a plate layer. Among them, the sandwich layer can be a honeycomb core, a tube core, a corrugated core, etc. Preferably, the sandwich layer includes a plurality of hollow tubes, the upper and lower ends of the hollow tubes are flanged, and the hollow tubes are welded to the plate layer through the flanges, preferably brazed. The sandwich panel of this embodiment is preferably made of stainless steel. The life of stainless steel is almost infinite. When used in wind turbines for wind power generation, it can be installed at any electricity demand terminal with poor wind conditions, achieving excellent returns on investment and huge carbon reductions, and is expected to become the ultimate solution for human climate protection.

[0032] In this embodiment, the number of the blade middle section 12 can be multiple, and the number of splicing sections in this embodiment can be selected according to demand. The longer the length, the more splicing sections. The front end of the blade root section 11 is provided with a connecting joint 5 connected to the support tube 2. The connecting joint 5 is preferably a flange. Ribs are arranged at intervals between the flange and the support tube 2 to strengthen the connection strength of the connecting joint 5. The blade root section 11 is provided with a sealing plate 6 on the connection side of the connecting joint 5, which is used to completely or semi-close the front end of the blade root section 11 to prevent rainwater or other particles from entering. The connection between the adjacent sections of the blade shell 1 is provided with a segmented joint 7, which is also preferably a flange. The flange is arranged on the support tube 2. After the flanges between the connected sections are butt-jointed, bolts are passed through the threaded holes on the flange to achieve connection and fixation, and the flange is wrapped in the blade shell. In addition, when the flanges of adjacent sections are connected, in order to facilitate the tightening of the bolts, a notch 14 can be opened on the blade shell 1. The notch space must meet the bolt installation of the flange, so as to achieve rapid installation between the adjacent sections of the blade shell 1. After installation, the gap can be sealed to prevent water or other particles from entering. Alternatively, if the gap is not sealed, even if water enters, it can flow out from the side of the gap. It is understandable that the flange between adjacent sections of the present invention can be set on the outside of the blade shell in addition to being set inside the blade shell, so that the threaded hole is exposed to the outside of the blade shell, and there is no need to open a gap, and the bolts can be screwed from the outside. Alternatively, the flange is wrapped in the blade shell, and there is no need to set a gap. People can enter the support tube to screw the bolts, so that the appearance is not affected. This is suitable for large blade structures.

[0033] In this embodiment, each section of the blade shell 1 preferably includes four panels 3, and the panels 3 are planar sandwich panels, and the four panels 3 are connected to the outer wall of the support tube 2 through the mounting plate 21. Among them, the number of mounting plates 21 is four, which are respectively arranged on both sides of the top and bottom of the support tube 2, and are symmetrically arranged. The top wall of the mounting plate 21 is parallel to the panel 3, and the side wall of the mounting plate 21 is connected and fixed to the panel 3. If the mounting portion is not provided, there will be discontinuity and flatness between the support tube 2 and the panel 3, and the strength of the support tube will be reduced. By providing the mounting plate 21, the surface continuity and flatness between the support tube 2 and the panel 3 can be increased.

[0034] In this embodiment, the connection mode of the four panels of the middle section 12 of the blade is as follows: the adjacent panels on one side of the blade shell 1 are connected into one body through the arc connecting plate 8 at the end away from the support tube 2, that is, the arc connecting plate 8 is connected between the two panels 3 connected to the top and bottom of the support tube 2 and located on the same side, and the two panels are connected into one body through the arc connecting plate 8. By setting the arc connecting plate 8, on the one hand, the aerodynamic shape factor is taken into consideration, that is, the aerodynamic performance of the arc structure is good, which is conducive to improving the power generation efficiency; on the other hand, the existing blade shell is usually a curved surface, which is complicated to process, and if it is a sandwich structure, it is more difficult to set it into a curved surface, which is difficult to process and costly; therefore, this embodiment preferably adopts a sandwich panel with a planar structure to make the blade shell; however, if the sandwich panels with a planar structure are connected, it is not easy to dock, and the edges are sharp after docking, which will affect the aerodynamic performance. By setting the arc connecting plate 8, the above problem can be solved, that is, the above structure can ensure the simplicity of the processing of the middle section of the blade and the aerodynamic efficiency. Furthermore, a bent connecting plate 10 is provided between adjacent panels and the arc connecting plate, and the bent connecting plate 10 is welded to the panel 3 and the arc connecting plate 8 as a whole. By providing the bent connecting plate 10, on the one hand, the connection area of ​​the panel can be increased. If the panels are connected with the arc connecting plate, the connection area is small and the connection strength is low, while the panel is connected with the bent plate, the connection strength can be improved; on the other hand, the bending resistance of the arc connecting plate can be increased to ensure the stability of the arc connecting plate. In addition, the bent connecting plate is designed as a bent structure, which is convenient for matching and connecting with two panels and reducing the connection gap.

[0035] In this embodiment, the adjacent panels on the other side of the blade shell 1 are staggered at the end away from the support tube 2, so that a panel extends outward along the connection. That is, the width of one panel is greater than the width of the other panel. For example, the width of the panel connected to the top of the support tube is larger. When the two panels are connected, the panel with the larger width will extend outward. The present invention sets different structures on both sides, that is, an arc-shaped connecting plate is set on one side, and a staggered connection structure is set on the other side, so that the windward side and the leeward side of the blade are asymmetrical, which is conducive to improving the lift and power generation efficiency of the blade. Among them, the end of the panel with a smaller width is designed as an inclined surface to facilitate seamless docking with the panel with a larger width; or the end of the panel with a smaller width is provided with a patch plate 31 with an inclined surface, and connected to the other panel through the patch plate 31. The tail end of the extended panel is provided with a convex portion 9 with a pointed or arc-shaped structure. The cross-sectional shape of the convex portion 9 is preferably a triangle, and the vertex of the triangle is a tip or an arc-shaped end. By additionally setting the convex portion 9, the aerodynamic shape factor is also taken into consideration, which can not only improve the aerodynamic efficiency but also reduce the noise.

[0036] In this embodiment, the structure of the blade tip section 13 can also be formed by splicing at least four panels, and can be designed into a conical structure through a flat sandwich panel, with the tail end forming a tip. The function of the blade tip section 13 is to end the transition and reduce resistance and noise.

[0037] In this embodiment, the blade root section 11 is also formed by splicing at least four panels, and reinforcing ribs 4 may be provided in the inner cavity of the blade shell to further improve the strength.

[0038] In this embodiment, the size of the blade shell 1 gradually decreases from the blade root section 11 to the blade tip section 13. Therefore, the overall structure of the support tube 2 in this embodiment is a conical tube structure, which can be a circular conical tube structure or a polygonal conical tube structure.

[0039] In this embodiment, the sizes of the middle blade section 12 and the tip section 13 are preferably designed to be standard sizes, and different blade root sections (i.e., heads) can be replaced to achieve blades of different powers. For example, if the middle blade section includes 3 sections, a small-sized blade root section can be selected and spliced ​​to form a small-sized wind power generation blade; or if the middle blade section includes 7 sections, a large-sized blade root section needs to be selected and spliced ​​to form a large-sized wind power generation blade. Therefore, this design structure is flexible to assemble and can be transformed into blades of different sizes at any time without the need for additional design.

[0040] In summary, this embodiment can, on the one hand, improve the overall strength of the support tube and thus improve the overall strength of the blade; on the other hand, it can achieve lightweight and greatly improve aerodynamic efficiency by designing the structure of the blade shell.

Claims

1. A wind power generation blade, comprising a blade shell and a support tube, wherein the blade shell comprises a plurality of panels; characterized in that: The panel of the blade shell is connected to the outer wall of the support tube through a mounting plate; there are four mounting plates, which are respectively arranged on both sides of the top and bottom of the support tube and are symmetrically arranged, the top wall of the mounting plate is parallel to the panel, and the side wall of the mounting plate is connected and fixed to the panel; the adjacent panels on one side of the blade shell are connected into one body through an arc-shaped connecting plate at the end away from the support tube, and a bent connecting plate is provided between the adjacent panels and the arc-shaped connecting plate; the adjacent panels on the other side of the blade shell are staggeredly connected at the end away from the support tube, so that a panel extends outward along the connection.

2. The wind turbine blade according to claim 1, characterized in that: A convex portion with a pointed or arc-shaped structure is provided at the tail end of the panel extending from the other side of the blade shell.

3. The wind turbine blade according to claim 1 or 2, characterized in that: The panel is a flat sandwich panel.

4. The wind turbine blade according to claim 1 or 2, characterized in that: The blade shell and the support tube are both segmented structures, including a blade root segment, a blade middle segment and a blade tip segment; a connecting joint is provided at the front end of the blade root segment; and segmented joints are provided at the connection between adjacent segments.

5. The wind turbine blade according to claim 1 or 2, characterized in that: The support tube is a cone tube structure.

6. The wind turbine blade according to claim 1 or 2, characterized in that: The panel is made of stainless steel sandwich material.

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