Fan blades and fan

Abstract

This invention provides a fan blade and a fan, including a blade body and a ply structure. The blade body has an inner cavity and forms a leading edge and a trailing edge along its width. The ply structure is disposed on the outer surface of the blade body and includes a first part and a second part disposed along the width of the blade body. The first part and the second part are located on opposite sides of the plane where the shear center of the blade body is located, and the weight of the first part is greater than the weight of the second part. The ply structure of the fan blade in this application uses a first part that is heavier than the second part along its width to ensure that the shear center is oriented towards the leading edge. By using different weights for the first and second parts, it is beneficial to adjust the shear center through the ply structure, thereby improving the stability of the fan blade and ensuring its long-term stable operation. This solves the problem of poor stability and unsuitability for long-term operation of existing fan blades.

Description

Technical Field

[0001] This invention relates to the field of wind turbine technology, and more specifically, to a wind turbine blade and a wind turbine. Background Technology

[0002] Wind power, as a crucial component of renewable energy, has experienced rapid development globally in recent years, particularly in offshore and low-wind-speed wind power. Driven by advancements in wind power technology and market demand, the capacity of individual wind turbine units has continuously increased, with blade lengths growing from approximately 30 meters initially to over 100 meters. The world's longest wind turbine blade has even reached 126 meters, matching 16-18MW offshore wind turbine units. While this trend towards larger scale has improved wind energy utilization efficiency and economic benefits, it has also brought new technological challenges, especially in the aerodynamic and structural dynamics of the blades.

[0003] Large wind turbine blades, as a typical long and flexible structure, undergo elastic deformation under aerodynamic loads. This deformation further affects the aerodynamic characteristics of the blades, forming a complex coupling relationship between aerodynamics and structure.

[0004] In wind turbine design, to improve energy efficiency, it's necessary to increase blade rotation speed to increase airflow. However, increasing blade rotation speed also increases blade momentum, thus increasing lift. Therefore, improving wind turbine efficiency requires optimizing the blade structure to enhance its stability.

[0005] For blades with streamlined structures, the lift can be further improved by using better materials and advanced technologies and processes, but this also increases material and manufacturing costs.

[0006] To improve the stability of the blade structure and reduce manufacturing costs, special mechanisms need to be designed into the blade structure. For example, the prior art discloses a wind turbine blade, including a blade body, which includes an inner cavity. The cross-section of the blade body is streamlined, that is, the cross-section of the inner cavity is streamlined. The inner cavity is arranged along the length direction of the blade body. One end of the inner cavity is provided with an air inlet, and the other end of the inner cavity is provided with an air outlet. The blade body is provided with multiple reinforcing ribs, which are evenly arranged along the length direction of the blade body. The multiple reinforcing ribs form a sandwich chamber. One end of the sandwich chamber is connected to the air outlet, and the other end of the sandwich chamber is connected to the inner cavity.

[0007] However, while multiple reinforcing ribs can be added to the inner cavity of the blade body to improve its strength, this will increase the weight of the blade body, which is not conducive to improving the efficiency of the wind turbine.

[0008] As can be seen from the above, the existing wind turbine blades have poor stability, which is not conducive to long-term operation. Summary of the Invention

[0009] The main objective of this invention is to provide a fan blade and a fan to solve the problem that the fan blades in the prior art have poor stability and are not conducive to long-term operation.

[0010] To achieve the above objectives, according to one aspect of the present invention, a fan blade is provided, the fan blade including a blade body and a ply structure, the blade body having an inner cavity, the blade body forming a leading edge and a trailing edge along the width direction, the ply structure being disposed on the outer surface of the blade body, the ply structure including a first part and a second part disposed along the width of the blade body, the first part and the second part being located on opposite sides of the plane where the shear center of the blade body is located, the weight of the first part being greater than the weight of the second part.

[0011] Furthermore, the material density of the first part is greater than that of the second part.

[0012] Furthermore, the materials of the first part and the second part are the same, and the laying thickness of the first part is greater than that of the second part.

[0013] Furthermore, the first and second parts are made of the same material, and along the length of the blade body, the laying width of the first part is greater than that of the second part.

[0014] Furthermore, the fan blade also includes structural components, which are disposed on the inner surface of the fan blade body and are correspondingly disposed with the first part.

[0015] Furthermore, along the thickness direction of the fan blades, at least one of the upper and lower surfaces of the inner cavity, which are arranged opposite to each other, has a structural component.

[0016] Furthermore, structural components are provided on both the upper and lower surfaces, and the structural components on the upper and lower surfaces are arranged symmetrically.

[0017] Furthermore, the structural components are made of fabric; and / or the structural components are coated.

[0018] Furthermore, the fan blade also includes a reinforcing plate, which is disposed in the inner cavity and along the width direction of the fan blade body, between the shear center and the leading edge; and a counterweight, which is disposed on the reinforcing plate.

[0019] According to another aspect of the present invention, a fan is provided, the fan comprising the aforementioned fan blades.

[0020] According to the technical solution of the present invention, the wind turbine blade includes a blade body and a ply structure. The blade body has an inner cavity, and the blade body forms a leading edge and a trailing edge along the width direction. The ply structure is disposed on the outer surface of the blade body. The ply structure includes a first part and a second part disposed along the width of the blade body. The first part and the second part are located on both sides of the plane where the shear center of the blade body is located. The weight of the first part is greater than the weight of the second part.

[0021] As can be seen from the above, the ply structure of the fan blade in this application adopts a first part that is heavier than the second part along the width direction, so as to set the shear center towards the leading edge. By setting the first part and the second part with different weights, it is beneficial to adjust the shear center through the ply structure, thereby improving the stability of the fan blade and ensuring the long-term stable operation of the fan blade.

[0022] In order to improve the strength of the fan blades, this application proposes to adjust the shear center of the fan blades so that the shear center is closer to the leading edge and the aerodynamic center of the fan blades. This will improve the strength of the fan blades, making them less prone to deformation under stress, which is beneficial for reducing load, improving the aeroelastic coupling effect, and also helping to achieve the stability of the fan blades during long-term outdoor operation. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A cross-sectional schematic diagram of the fan blades of the present invention is shown;

[0025] Figure 2 A schematic diagram of the overall structure of the fan blades of the present invention is shown.

[0026] The above figures include the following reference numerals:

[0027] 10. Fan blade body; 110. Inner cavity; 120. Leading edge end; 130. Trailing edge end; 20. Structural component; 30. Reinforcing plate; 40. Counterweight block. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0031] To address the problem of poor stability of existing fan blades, which is detrimental to long-term operation, this application provides a fan.

[0032] The wind turbine in this application is a large-scale wind turbine used in offshore wind farms.

[0033] Specifically, the fan includes a fan body and fan blades mounted on the fan body, with the fan body driving the fan blades to rotate.

[0034] In this embodiment, the wind turbine blades are configured to adjust the position of the shear center, so that the shear center moves toward the leading edge 120 side, which helps to improve the operational stability of the wind turbine blades, thereby ensuring the operational stability of the wind turbine and improving power generation efficiency.

[0035] like Figure 1 and Figure 2 As shown, the fan blade includes a blade body 10 and a ply structure. The blade body 10 has an inner cavity 110. The blade body 10 forms a leading edge 120 and a trailing edge 130 along the width direction. The ply structure is disposed on the outer surface of the blade body 10. The ply structure includes a first part and a second part disposed along the width of the blade body 10. The first part and the second part are located on both sides of the plane where the shear center of the blade body 10 is located. The weight of the first part is greater than the weight of the second part.

[0036] The cross-section of the fan blade is streamlined, and the cross-section of the inner cavity 110 is streamlined. Along the width direction of the fan blade, it is formed in sequence as the leading edge 120, the aerodynamic center inside the cross-section, the shear center inside the cross-section, and the trailing edge 130.

[0037] Specifically, the wind turbine blade of this application has a layered structure in which the first part is heavier than the second part along the width direction, so that the shear center is set towards the leading edge 120 side. By setting the first part and the second part with different weights, it is beneficial to adjust the shear center through the layered structure, thereby improving the stability of the wind turbine blade and ensuring the long-term stable operation of the wind turbine blade.

[0038] The plane containing the shear center is Figure 1The surface shown is SS; the length direction of the blade body 10 is the X direction shown in the figure; the width direction of the blade body 10 is the Y direction shown in the figure.

[0039] In order to improve the strength of the fan blade, this application can adjust the shear center of the fan blade so that the shear center of the fan blade is close to the leading edge 120 and also close to the aerodynamic center of the fan blade, thereby improving the strength of the fan blade. The fan blade is not easy to deform under stress, which is conducive to achieving the purpose of load reduction, improving the aeroelastic coupling effect, and also conducive to achieving the stability of the fan blade during long-term outdoor operation.

[0040] In this embodiment, the weight of the first part and the second part can be achieved by the material density of the first part being greater than that of the second part. Without adding additional structures or disrupting the overall structure, the weight of the first part can be increased by adjusting the material density. Specifically, this can be achieved by laying different sealing layers to make the weight of the first part greater than that of the second part. It should be noted that "the weight of the first part is greater than that of the second part" refers to the weight of the first part per unit area being greater than that of the second part.

[0041] In another embodiment, the first and second portions are made of the same material, but the first portion has a greater thickness than the second portion. Because the first portion of this application has a greater thickness than the second portion, the first portion has a greater weight per unit area than the second portion.

[0042] In another embodiment, the first and second parts are made of the same material, and the width of the first part is greater than the width of the second part along the length of the blade body 10. Making the width of the first part greater than the width of the second part helps to increase the weight of both parts, thereby setting the shear center towards the leading edge 120 and improving the stability of the fan blade.

[0043] like Figure 1 and Figure 2 As shown, the fan blade also includes a structural component 20, which is disposed on the inner surface of the fan blade body 10 and is disposed corresponding to the first part.

[0044] Specifically, by adding a region corresponding to the first part on the inner surface of the inner cavity 110 of the fan blade, the weight of the first part region is further increased, so as to move the shear center toward the leading edge 120, improve the overall structural strength of the fan blade, and thus improve the overall stability.

[0045] Specifically, along the thickness direction of the fan blades, at least one of the upper and lower surfaces of the inner cavity 110, which are arranged opposite to each other, has a structural member 20. Having a structural member 20 on one of the surfaces between the upper and lower surfaces allows the shear center to be oriented towards the leading edge 120. When both the upper and lower surfaces have structural members 20, it helps to improve the structural strength of the fan blades and further ensures the stability of the structure.

[0046] In this embodiment, structural members 20 are provided on both the upper and lower surfaces, and the structural members 20 on the upper and lower surfaces are symmetrically arranged. This symmetrical arrangement of the structural members 20 on the upper and lower surfaces helps to ensure the uniformity of the overall structural arrangement of the fan blades while maintaining their strength, thereby improving the stability of the structural design.

[0047] In this embodiment, the structural component 20 is made of fabric, which is attached to the inner surface of the inner cavity 110.

[0048] In another embodiment, the structural member 20 is a coating applied to the inner surface of the cavity 110.

[0049] like Figure 1 and Figure 2 As shown, the fan blade also includes a reinforcing plate 30 and a counterweight 40. The reinforcing plate 30 is disposed in the inner cavity 110. Along the width direction of the fan blade body 10, the reinforcing plate 30 is disposed between the shear center and the leading edge 120. The counterweight 40 is disposed on the reinforcing plate 30.

[0050] Specifically, by setting a reinforcing plate 30 and a counterweight 40 in the area corresponding to the first part on the inner cavity 110, the position of the shear center of the fan blades can be adjusted by the reinforcing plate 30 and the counterweight 40, thereby improving the stability of the overall structure.

[0051] In this embodiment, the reinforcing plate 30 is supported inside the inner cavity 110 and is upright in the inner cavity 110. The reinforcing plate 30 can provide an installation position for the counterweight 40, which is beneficial for adjusting the position of the shear center of the fan blades through the structure in which the counterweight 40 and the reinforcing plate 30 are configured together. The counterweight 40 can be a structural block made of metal.

[0052] In this embodiment, one or more reinforcing plates 30 are provided, and one or more counterweights 40 are provided on each reinforcing plate 30. When multiple counterweights 40 are provided on a reinforcing plate 30, the multiple counterweights 40 are spaced apart along the length and width of the reinforcing plate 30, which is beneficial to adjust the arrangement of the counterweights to ensure the stability of the overall structure.

[0053] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0054] The wind turbine blade of this application has a layered structure in which the first part is heavier than the second part along the width direction, so that the shear center is set towards the leading edge 120. By setting the first part and the second part with different weights, it is beneficial to adjust the shear center through the layered structure, thereby improving the stability of the wind turbine blade and ensuring the long-term stable operation of the wind turbine blade.

[0055] In order to improve the strength of the fan blade, this application can adjust the shear center of the fan blade so that the shear center of the fan blade is close to the leading edge 120 and also close to the aerodynamic center of the fan blade, thereby improving the strength of the fan blade. The fan blade is not easy to deform under stress, which is conducive to achieving the purpose of load reduction, improving the aeroelastic coupling effect, and also conducive to achieving the stability of the fan blade during long-term outdoor operation.

[0056] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fan blade, characterized in that, include: The wind blade body (10) has an inner cavity (110) and a leading edge end (120) and a trailing edge end (130) are formed along the width direction. A layered structure is provided on the outer surface of the blade body (10). The layered structure includes a first part and a second part provided along the width of the blade body (10). The first part and the second part are located on both sides of the plane where the shear center of the blade body (10) is located. The weight of the first part is greater than the weight of the second part, so that the shear center is set towards the leading edge end (120). By using a structure with different weights for the first part and the second part, it is beneficial to adjust the shear center through the layered structure, thereby improving the stability of the fan blade and ensuring the long-term stable operation of the fan blade. A reinforcing plate (30) and a counterweight (40) are provided. The reinforcing plate (30) is disposed in the inner cavity (110) along the width direction of the fan blade body (10). The reinforcing plate (30) is disposed between the shear center and the leading edge end (120). The counterweight (40) is disposed on the reinforcing plate (30). The reinforcing plate (30) is provided with one or more, and each reinforcing plate (30) is provided with one or more counterweights (40). When a reinforcing plate (30) is provided with multiple counterweights (40), the multiple counterweights (40) are spaced apart along the length and width directions of the reinforcing plate (30).

2. The fan blade according to claim 1, characterized in that, The material density of the first part is greater than that of the second part.

3. The fan blade according to claim 1, characterized in that, The first part and the second part are made of the same material, and the laying thickness of the first part is greater than that of the second part.

4. The fan blade according to claim 1, characterized in that, The first part and the second part are made of the same material, and the laying length of the first part is greater than that of the second part along the length direction of the blade body (10).

5. The fan blade according to any one of claims 1 to 4, characterized in that, The fan blades also include: Structural component (20) is disposed on the inner surface of the fan blade body (10), and the structural component (20) is disposed corresponding to the first part.

6. The fan blade according to claim 5, characterized in that, Along the thickness direction of the fan blades, at least one of the upper and lower surfaces of the inner cavity (110) that are arranged opposite to each other has the structural member (20).

7. The fan blade according to claim 6, characterized in that, The structural component (20) is provided on both the upper surface and the lower surface, and the structural component (20) on the upper surface and the lower surface are symmetrically arranged.

8. The fan blade according to claim 5, characterized in that, The structural component (20) is made of fabric; and / or The structural component (20) is a coating.

9. A fan, characterized in that, Includes the fan blades according to any one of claims 1 to 8.

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