Fan blades and fans

Abstract

This invention provides a fan blade and a fan. The fan blade includes a blade body and a counterweight structure. The blade body has an inner cavity and, along its length, has a blade root and a blade tip. The counterweight structure is disposed inside the inner cavity, along the length of the blade body, between the blade root and the plane where the center of gravity of the blade body is located. The fan blade of this application employs a counterweight structure inside the blade body to adjust the distribution of the fan blade's center of gravity. Compared to existing technologies, the center of gravity of the fan blade in this application shifts towards the blade root to form a new center of gravity. The counterweight structure is positioned between the plane of the new center of gravity and the blade root to maintain the new center of gravity, thereby improving the stability and efficiency of the fan operation and solving the problem of poor stability in existing fan blades during operation.

Description

Technical Field

[0001] This invention relates to the technical field of wind power generation equipment, 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. As the length of wind turbine blades increases, the flexibility and nonlinear deformation of the blades make aeroelastic phenomena more pronounced. Especially under extreme wind conditions, instability phenomena such as flutter may occur, which can lead to the structural damage of the blades or even the entire wind turbine unit in severe cases.

[0004] Flutter is a self-excited vibration caused by the interaction of aerodynamic loads and structural characteristics. It significantly increases the stress level of the blades, accelerates material fatigue accumulation, and thus reduces blade lifespan and the reliability of wind turbines. Furthermore, with the increasing size of wind turbines, the weight and size of the blades have also increased accordingly, posing significant challenges to blade manufacturing, transportation, and installation. During the installation phase, the blade root is the primary load-bearing area. If the blade's center of gravity is not properly distributed, it will lead to excessively high bending moments at the blade root, increasing structural strength and material costs, while also affecting the dynamic performance and stability of the blades.

[0005] Currently, wind turbine blade design and manufacturing primarily focus on optimizing blade shape, material distribution, and structural design to reduce aerodynamic loads and improve structural stability. However, these methods are often limited to static load considerations, with insufficient research on the aerodynamic-structural coupled response under dynamic and time-varying loads. Especially in offshore wind farms, due to the uncertainty of wind speed and direction, the aerodynamic loads faced by wind turbine blades are more complex and variable, making it difficult for existing technologies to accurately predict and control the dynamic performance of blades under extreme conditions.

[0006] As can be seen from the above, the existing technology of wind turbine blades has the problem of poor stability during operation. Summary of the Invention

[0007] The main objective of this invention is to provide a fan blade and a fan to solve the problem of poor stability of fan blades in the prior art during operation.

[0008] To achieve the above objectives, according to one aspect of the present invention, a fan blade is provided, the fan blade including a fan blade body having an inner cavity, the fan blade body having a blade root and a blade tip at the end along the length direction; a counterweight structure disposed inside the inner cavity, and disposed between the blade root and the plane where the center of gravity of the fan blade body is located along the length direction of the fan blade body.

[0009] Furthermore, the counterweight structure is disposed on the inner surface of the inner cavity.

[0010] Furthermore, multiple counterweight structures are provided, and the multiple counterweight structures are spaced apart along the length direction of the wind turbine body; and / or multiple counterweight structures are provided, and the inner cavity along the height direction of the wind turbine body has a first surface and a second surface arranged opposite to each other, and at least one counterweight structure is provided on each of the first surface and the second surface.

[0011] Furthermore, the interior of the cavity has a mounting plate arranged along the height direction of the blade body, and along the length direction of the blade body, the mounting plate is arranged between the plane where the blade root and the center of gravity are located, and the counterweight structure is arranged on the mounting plate.

[0012] Furthermore, multiple counterweight structures are provided, and these multiple counterweight structures are spaced apart along the length and / or width of the mounting plate.

[0013] Furthermore, the fan blades also include a first counterweight block, which can be optionally installed inside the counterweight structure. There are multiple counterweight structures, and the first counterweight block is installed in some of the multiple counterweight structures; or the first counterweight block is installed in each counterweight structure.

[0014] Furthermore, the fan blade also includes a web plate, which is disposed in the inner cavity and extends along the length of the fan blade body; and a second counterweight, which is disposed on the web plate and is located between the blade root and the center of gravity along the length of the fan blade body.

[0015] Furthermore, the web has a groove extending along the length of the blade body, and the second counterweight is slidably disposed on the groove.

[0016] Furthermore, the wind turbine blade also includes a ply structure, which is disposed on the surface of the blade body. The ply structure has a first part and a second part disposed along the length direction of the blade body. The first part is disposed between the blade root and the plane where the center of gravity is located, and the weight of the first part is greater than the weight of the second part.

[0017] According to another aspect of the present invention, a fan is provided, the fan comprising the aforementioned fan blades.

[0018] According to the technical solution of the present invention, the fan blade includes a fan blade body and a counterweight structure. The fan blade body has an inner cavity and has a blade root and a blade tip at the end along the length direction. The counterweight structure is disposed inside the inner cavity and is disposed between the blade root and the center of gravity of the fan blade body along the length direction of the fan blade body.

[0019] As can be seen from the above, the fan blade of this application adopts a counterweight structure inside the blade body to adjust the distribution of the center of gravity of the fan blade. Compared with the prior art, the center of gravity of the fan blade of this application moves towards the blade root to form a new center of gravity. The counterweight structure is set between the plane where the new center of gravity is located and the blade root to maintain the new center of gravity, thereby improving the stability and efficiency of the fan operation.

[0020] This application reduces the bending moment of the wind turbine blades by setting a counterweight structure inside the blades to move the center of gravity of the blades toward the blade root area, thereby improving the stability of the blades, which is conducive to achieving the purpose of load reduction and improving the aeroelastic coupling effect. Attached Figure Description

[0021] 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:

[0022] Figure 1 A schematic diagram of the structure of the fan blade of the present invention is shown.

[0023] The above figures include the following reference numerals:

[0024] 10. Blade body; 110. Blade root; 120. Blade tip; 20. Mounting plate; 30. Counterweight structure; 40. Web plate; 410. Slide groove; 50. Second counterweight block. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] To address the problem of poor stability of existing fan blades during operation, this application provides a fan.

[0029] The wind turbine in this application is a large-scale wind turbine used in offshore wind farms.

[0030] 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.

[0031] In this embodiment, the wind turbine blades are designed to adjust the position of the center of gravity of the wind turbine blades so that the center of gravity moves towards the blade root 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.

[0032] like Figure 1 As shown, the fan blade includes a fan blade body 10 and a counterweight structure 30. The fan blade body 10 has an inner cavity. Along the length direction, the fan blade body 10 has a blade root 110 and a blade tip 120 at the end. The counterweight structure 30 is disposed inside the inner cavity. Along the length direction of the fan blade body 10, the counterweight structure 30 is disposed between the plane where the blade root 110 and the center of gravity of the fan blade body 10 are located.

[0033] The plane containing the center of gravity is a vertical plane, and the length direction of the blade body 10 is set perpendicular to the plane containing the center of gravity.

[0034] Specifically, the fan blade of this application adopts a counterweight structure 30 set inside the fan blade body 10 to adjust the distribution of the center of gravity of the fan blade. Compared with the prior art, the center of gravity of the fan blade of this application moves towards the blade root 110 to form a new center of gravity. The counterweight structure 30 is set between the plane where the new center of gravity is located and the blade root 110 to maintain the new center of gravity, thereby improving the stability and efficiency of the fan operation.

[0035] The length direction of the blade body 10 is Figure 1 The X-direction shown indicates that the height direction of the blade body 10 is [missing information]. Figure 1 The Z direction is shown.

[0036] This application reduces the bending moment of the wind turbine blades by setting a counterweight structure 30 inside the blades to move the center of gravity of the blades toward the blade root 110 area, thereby improving the stability of the blades, which is conducive to achieving the purpose of load reduction and improving the aeroelastic coupling effect.

[0037] In this embodiment, the counterweight structure 30 can be a block structure, a plate structure, a counterweight layer, etc., wherein the counterweight layer can be a structure such as cloth, and the plate structure and block structure can be made of metal. The counterweight structure 30 facilitates the movement of the center of gravity towards the blade root 110, thereby improving the stability of the fan blade. The counterweight structure 30 can be welded and fixed inside the inner cavity, or it can be attached to the inner cavity, or it can be fixed to the inner cavity of the fan blade body 10 by fasteners such as bolts.

[0038] In this embodiment, the counterweight structure 30 is disposed on the inner surface of the inner cavity. The counterweight structure 30 can be directly installed on the inner surface of the inner cavity, or it can be installed on the inner surface of the inner cavity via the mounting plate 20. By disposing of the counterweight structure 30 on the inner surface of the inner cavity, the counterweight structure 30 is fixed in place, ensuring that the counterweight structure 30 will not shake or shift in position during the operation of the fan blades, thus guaranteeing the overall operational stability of the fan blades.

[0039] In this embodiment, one or more counterweight structures 30 are provided.

[0040] When multiple counterweight structures 30 are provided, the multiple counterweight structures 30 are spaced apart along the length direction of the blade body 10, so as to facilitate the movement of the center of gravity toward the blade root 110 side in the length direction, forming a new structure of the fan blade, which facilitates the improvement of the overall structure stability.

[0041] When multiple counterweight structures 30 are provided, the inner cavity along the height direction of the fan blade body 10 has a first surface and a second surface arranged opposite to each other, and at least one counterweight structure 30 is provided on each of the first and second surfaces. The presence of counterweight structures 30 on both the first and second surfaces along the height direction of the fan blade body 10 improves the overall structural stability of the fan blade, thus ensuring its stability. Preferably, the counterweight structures 30 on the first and second surfaces are symmetrically arranged.

[0042] like Figure 1 As shown, the interior of the cavity has an installation plate 20 arranged along the height direction of the blade body 10. Along the length direction of the blade body 10, the installation plate 20 is arranged between the blade root 110 and the plane where the center of gravity is located. The counterweight structure 30 is arranged on the installation plate 20.

[0043] The mounting plate 20 is placed upright in the inner cavity. By setting the mounting plate 20, it is convenient to fix the counterweight structure 30, which helps to improve the assembly efficiency of the fan blades.

[0044] Specifically, one end of the mounting plate 20 along the height direction of the fan blade is fixedly connected to the first surface, and the other end is fixedly connected to the second surface, which facilitates the stable installation of the mounting plate 20 in the inner cavity. At the same time, the installation of the mounting plate 20 helps to improve the structural strength of the fan blade body 10.

[0045] In this embodiment, multiple counterweight structures 30 are provided, and the multiple counterweight structures 30 are spaced apart along the length and / or width of the mounting plate 20. The counterweight structures 30 are spaced apart along the length and width directions of the mounting plate 20. This arrangement of multiple counterweight structures 30 on the same vertical plane facilitates the adjustment of the center of gravity position, thereby improving the operational stability of the fan blades.

[0046] In this embodiment, to further ensure that the counterweight structure 30 can adjust the center of gravity, the fan blade of this application also includes a first counterweight block, which can be optionally disposed inside the counterweight structure 30. Specifically, the first counterweight block is disposed inside the counterweight structure 30 to form an integral structure with the first counterweight block and the counterweight structure 30, and the position of the center of gravity can be adjusted by the integral structure.

[0047] The first counterweight is a metal weight.

[0048] The first counterweight can be one or more. Multiple first counterweights can be set inside the same counterweight structure 30, or multiple first counterweights can be set to correspond to multiple counterweight structures 30.

[0049] In this embodiment, multiple counterweight structures 30 are provided, and some of the counterweight structures 30 are provided with a first counterweight block. The first counterweight block is provided inside some of the counterweight structures 30 to form a heavier structure, while the other part of the counterweight structure 30 without the first counterweight block is lighter in weight, so as to be adapted to be arranged inside the cavity along the length direction of the fan blade body 10.

[0050] In another embodiment, each counterweight structure 30 is provided with a first counterweight block. The presence of a first counterweight block in each counterweight structure 30 helps ensure a uniform arrangement of the structure formed by the counterweight structures 30 and the first counterweight blocks, thereby improving the structural stability of the fan blades.

[0051] like Figure 1As shown, the fan blade also includes a web plate 40 and a second counterweight 50. The web plate 40 is disposed in the inner cavity and extends along the length of the fan blade body 10. The second counterweight 50 is disposed on the web plate 40 and is disposed between the blade root 110 and the plane where the center of gravity is located along the length of the fan blade body 10.

[0052] Among them, the web plate 40 is the web plate 40 structure in the prior art.

[0053] The second counterweight 50 is a metal weight.

[0054] Specifically, by using the web plate 40 as the carrier of the second counterweight 50, the internal structure of the fan blades is utilized effectively, improving assembly efficiency. The second counterweight 50, mounted on the web plate 40, allows for adjustment of the center of gravity, ensuring the stability of the fan blades.

[0055] Furthermore, multiple second counterweights 50 can be provided. The provision of multiple second counterweights 50 further improves the efficiency of center of gravity adjustment and ensures the stability of the structure.

[0056] like Figure 1 As shown, the web plate 40 has a groove 410 extending along the length of the blade body 10, and the second counterweight 50 is slidably disposed on the groove 410.

[0057] Specifically, the structure of the slide groove 410 and the second counterweight 50 is adopted so that the position of the second counterweight 50 can be adjusted along the length of the fan blade body 10, thereby ensuring that the center of gravity position can be adjusted according to the sliding position of the second counterweight 50, which is beneficial to improving the range of application scenarios of the fan blade.

[0058] In this embodiment, a chute 410 and a second counterweight 50 are used. The position of the second counterweight 50 can be adjusted during the operation of the wind turbine blades, achieving adaptive balance of the wind turbine blades. This is particularly suitable for wind power generation systems that need to maintain stable operation under extreme wind speed conditions, such as areas affected by typhoons or hurricanes. The dynamic adjustment mechanism of the chute 410 and the second counterweight 50 allows the wind turbine blades to adjust their center of gravity in real time when facing extreme weather such as typhoons or hurricanes, reducing the stress on the wind turbine blades and protecting the equipment from damage. For wind power generation facilities located in disaster-prone areas, this design can significantly improve their disaster resistance and reduce the impact of natural disasters on power supply. It is an important technical means to improve the overall resilience of wind power generation systems.

[0059] In this embodiment, the fan blade also includes a ply structure. The ply structure is disposed on the surface of the fan blade body 10. The ply structure has a first part and a second part disposed along the length direction of the fan blade body 10. The first part is disposed between the blade root 110 and the plane where the center of gravity is located. The weight of the first part is greater than the weight of the second part.

[0060] Specifically, the weight distribution design of the ply structure not only optimizes the mechanical properties of the wind turbine blades but also enhances their wind resistance and service life. This makes it suitable for wind turbines that need to operate in high-wind-speed environments, such as ventilation systems in high-speed railway tunnels or wind power plants in extreme weather conditions. This weight-distributed ply structure effectively improves the wind resistance of the blades by adding weight in key areas. For ventilation systems in high-speed railway tunnels, it ensures stable operation of the blades even when trains pass at high speeds, reducing air resistance and improving the smoothness and safety of train operation. For wind power plants in extreme weather conditions, this design ensures that the blades maintain optimal operating conditions in harsh environments such as strong winds and low temperatures, extending the equipment's service life and reducing maintenance costs.

[0061] In this embodiment, the difference in weight between the first part and the second part can be due to the material density of the first part being greater than that of the second part, the first part and the second part being made of the same material and the thickness of the first part being greater than that of the second part, or the surface of the layup structure at the first part having a coating.

[0062] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0063] The fan blade of this application employs a counterweight structure 30 installed inside the fan blade body 10 to adjust the distribution of the fan blade's center of gravity. Compared with the prior art, the center of gravity of the fan blade of this application moves towards the blade root 110 to form a new center of gravity. The counterweight structure 30 is positioned between the plane of the new center of gravity and the blade root 110 to maintain the new center of gravity, thereby improving the stability and efficiency of the fan operation.

[0064] This application reduces the bending moment of the wind turbine blades by setting a counterweight structure 30 inside the blades to move the center of gravity of the blades toward the blade root 110 area, thereby improving the stability of the blades, which is conducive to achieving the purpose of load reduction and improving the aeroelastic coupling effect.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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 blade body (10) has an inner cavity and has a blade root (110) and a blade tip (120) at the end along the length direction. The counterweight structure (30) is disposed inside the inner cavity along the length direction of the blade body (10), and the counterweight structure (30) is disposed between the plane where the blade root (110) and the center of gravity of the blade body (10) are located. The interior of the cavity has an installation plate (20) arranged along the height direction of the blade body (10). Along the length direction of the blade body (10), the installation plate (20) is arranged between the blade root (110) and the plane where the center of gravity is located. The counterweight structure (30) is arranged on the installation plate (20). There are multiple counterweight structures (30), and the multiple counterweight structures (30) are spaced apart along the length and / or width of the installation plate (20). The first counterweight block is optionally disposed inside the counterweight structure (30). Multiple counterweight structures (30) are provided, and the first counterweight block is disposed in some of the multiple counterweight structures (30).

2. The fan blade according to claim 1, characterized in that, The fan blades also include other counterweight structures (30), which are disposed on the inner surface of the inner cavity.

3. The fan blade according to claim 2, characterized in that, The other counterweight structures (30) are provided in multiples, and the multiple counterweight structures (30) are spaced apart along the length direction of the fan blade body (10); and / or The other counterweight structures (30) are provided in multiple ways. The inner cavity has a first surface and a second surface arranged opposite to each other along the height direction of the blade body (10). At least one counterweight structure (30) is provided on each of the first surface and the second surface.

4. The fan blade according to any one of claims 1 to 3, characterized in that, The fan blades also include: A web (40) is disposed in the inner cavity and extends along the length direction of the blade body (10); The second counterweight (50) is disposed on the web (40) and is disposed between the blade root (110) and the center of gravity along the length of the blade body (10).

5. The fan blade according to claim 4, characterized in that, The web (40) has a groove (410) extending along the length of the blade body (10), and the second counterweight (50) is slidably disposed on the groove (410).

6. The fan blade according to any one of claims 1 to 3, characterized in that, The fan blades also include: A layup structure is disposed on the surface of the blade body (10). The layup structure has a first part and a second part disposed along the length direction of the blade body (10). The first part is disposed between the blade root (110) and the plane where the center of gravity is located. The weight of the first part is greater than the weight of the second part.

7. A fan, characterized in that, Includes the fan blades according to any one of claims 1 to 6.

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