Fan blade and fan

Abstract

The fan blade comprises a fan blade body and a balance weight structure, the fan blade body is provided with an inner cavity, the fan blade body is provided with a blade root and a blade tip at the end in the length direction, the balance weight structure is arranged in the inner cavity, and the balance weight structure is arranged in the length direction of the fan blade body. The counterweight structure is arranged between the blade root and the plane where the gravity center of the fan blade body is located. According to the fan blade, the balance weight structure is arranged in the fan blade body, so that distribution of the gravity center of the fan blade is adjusted, compared with the prior art, the gravity center of the fan blade moves towards one side of the blade root to form a new gravity center, the balance weight structure is arranged between the plane where the new gravity center is located and the blade root, and the balance weight structure is arranged between the plane where the new gravity center is located and the blade root. Therefore, a new gravity center is kept, the running stability and efficiency of the fan are improved, and the problem that in the prior art, fan blades are poor in stability in the running process is solved.

Description

Technical Field

[0001] The present invention relates to the technical field related to wind power generation equipment, and in particular to a fan blade and a fan. Background Art

[0002] As an important part of renewable energy, wind power generation has developed rapidly around the world in recent years, especially in the fields of offshore wind power and low wind speed wind power. With the advancement of wind power technology and the promotion of market demand, the unit capacity of wind turbines has continued to increase, and the length of blades has gradually increased from the initial 30 meters to more than 100 meters. Even the world's longest wind turbine blade has reached 126 meters, which is matched by a 16-18MW offshore wind turbine. Although this large-scale trend has improved the utilization efficiency and economic benefits of wind energy, it has also brought new technical challenges, especially in the aerodynamic-structural dynamics of blades.

[0003] Large wind turbine blades, as a typical long and flexible structure, will undergo elastic deformation under the action of aerodynamic loads. This deformation will further affect 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 the aeroelastic phenomenon more significant, especially in extreme wind conditions, where unstable phenomena such as flutter may occur, which can lead to structural damage to the blades or even the entire wind turbine in severe cases.

[0004] Flutter is a self-excited vibration caused by the interaction between aerodynamic loads and structural characteristics. It significantly increases the stress level of the blades and accelerates the fatigue accumulation of materials, thereby reducing the service life of the blades and the reliability of wind turbines. In addition, with the large-scale wind turbines, the weight and size of the blades have also increased accordingly, which has brought great challenges to the manufacture, transportation and installation of the blades. During the installation stage, the root of the wind blade is the main load-bearing area. If the center of gravity of the wind blade is not distributed reasonably, the bending moment at the root of the blade will be too high, increasing the structural strength and material cost, while affecting the dynamic performance and stability of the wind blade.

[0005] At present, the design and manufacture of wind blades mainly reduce aerodynamic loads and improve structural stability by optimizing blade shape, material distribution and structural design. However, these methods are often limited to the consideration of static loads, and insufficient research is conducted on the aerodynamic-structural coupling 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 blades are more complex and changeable, and existing technologies make it difficult to accurately predict and control the dynamic performance of blades under extreme conditions.

[0006] As can be seen from the above, the fan blades in the prior art have the problem of poor stability during operation. Summary of the invention

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

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a fan blade is provided, which includes a blade body, the blade body having an inner cavity, and the blade body having a blade root and a blade tip at the end along the length direction; a counterweight structure, the counterweight structure is arranged inside the inner cavity, and along the length direction of the blade body, the counterweight structure is arranged between the blade root and the plane where the center of gravity of the blade body is located.

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

[0010] Furthermore, there are multiple counterweight structures, which are spaced apart along the length direction of the blade body; and / or there are multiple counterweight structures, and the inner cavity along the height direction of the blade body has a first surface and a second surface that are relatively arranged, and at least one counterweight structure is arranged on the first surface and the second surface.

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

[0012] Further, a plurality of counterweight structures are provided, and the plurality of counterweight structures are arranged at intervals along the length and / or width of the mounting plate.

[0013] Furthermore, the fan blade also includes a first counterweight block, which can be optionally arranged inside the counterweight structure. There are multiple counterweight structures, and the first counterweight block is arranged in some of the multiple counterweight structures; or each counterweight structure is provided with a first counterweight block.

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

[0015] Furthermore, the web is provided with a slide groove extending along the length direction of the wind blade body, and the second counterweight block is slidably arranged on the slide groove.

[0016] Furthermore, the fan blade also includes a lamination structure, which is arranged on the surface of the blade body. The lamination structure has a first part and a second part arranged along the length direction of the blade body. The first part is arranged 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, and the fan comprises the above-mentioned fan blade.

[0018] Applying the technical solution of the present invention, the fan blade includes a blade body and a counterweight structure, the blade body has an inner cavity, and the blade body has a blade root and a blade tip at the end along the length direction, the counterweight structure is arranged inside the inner cavity, and along the length direction of the blade body, the counterweight structure is arranged between the blade root and the plane where the center of gravity of the blade body is located.

[0019] From the above, it can be seen that the fan blade of the present application adopts a counterweight structure set inside the blade body to adjust the distribution of the center of gravity of the fan blade, so that compared with the prior art, the center of gravity of the fan blade of the present application moves toward the blade root side 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] The present application arranges a counterweight structure inside the fan blade to move the center of gravity of the blade toward the blade root area, thereby reducing the bending moment of the fan blade and improving the stability of the blade, which is beneficial to achieving the purpose of load reduction and improving the gas-elastic coupling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

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

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

[0024] 10. wind blade body; 110. blade root; 120. blade tip; 20. mounting plate; 30. counterweight structure; 40. web; 410. slide groove; 50. second counterweight block. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0027] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0028] In order to solve the problem of poor stability of fan blades during operation in the prior art, the present application provides a fan.

[0029] Among them, the wind turbine of the present application is a large-scale wind power generation wind turbine, which is used in offshore wind farms.

[0030] Specifically, the fan includes a fan body and fan blades arranged on the fan body, and the fan body drives the fan blades to rotate.

[0031] In this embodiment, the fan blades adjust the position of the center of gravity of the fan blades through structural settings to achieve the movement of the center of gravity toward the blade root side, which is beneficial to improving the operating stability of the fan blades, thereby ensuring the stability of the fan operation and improving the power generation efficiency.

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

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

[0034] Specifically, the fan blade of the present application adopts a counterweight structure 30 set inside the blade body 10 to adjust the distribution of the center of gravity of the fan blade, so that compared with the prior art, the center of gravity of the fan blade of the present application moves toward 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 fan blade body 10 is Figure 1 In the X direction shown, the height direction of the fan blade body 10 is Figure 1 The Z direction is shown.

[0036] The present application arranges a counterweight structure 30 inside the fan blade to move the center of gravity of the blade toward the blade root 110 area, thereby reducing the bending moment of the fan blade and improving the stability of the blade, which is beneficial to achieving the purpose of load reduction and improving the gas-elastic 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, wherein the plate structure and the block structure can be made of metal, so that the center of gravity can be moved toward the blade root 110 by setting the counterweight structure 30, thereby improving the stability of the fan blade. The counterweight structure 30 can be welded and fixed inside the inner cavity, or can be attached to the inner cavity, or can be fixed to the inner cavity of the fan blade body 10 by fasteners, and the fasteners are structural parts such as bolts.

[0038] In this embodiment, the counterweight structure 30 is arranged 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 can be installed on the inner surface of the inner cavity through the mounting plate 20. By arranging the counterweight structure 30 on the inner surface of the inner cavity, the installation and fixation of the counterweight structure 30 is achieved, ensuring that the counterweight structure 30 will not shake or shift in position during the operation of the fan blade, thereby ensuring the overall operation stability of the fan blade.

[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 fan blade body 10 to facilitate movement of the center of gravity toward the blade root 110 in the length direction, thereby forming a fan blade with a new structure and improving the stability of the overall structure.

[0041] When there are multiple counterweight structures 30, the inner cavity along the height direction of the fan blade body 10 has a first surface and a second surface that are oppositely arranged, and at least one counterweight structure 30 is arranged on the first surface and the second surface. Counterweight structures 30 are arranged on the first surface and the second surface along the height direction of the fan blade body 10 to improve the overall structural stability of the fan blade, which is conducive to ensuring the stability of the fan blade. Preferably, the counterweight structures 30 on the first surface and the second surface are arranged symmetrically as a whole.

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

[0043] The mounting plate 20 is vertically placed in the inner cavity. By providing the mounting plate 20 , it is convenient to fix and install the counterweight structure 30 , which is beneficial to improving 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, thereby facilitating the stable setting of the mounting plate 20 in the inner cavity. At the same time, the setting of the mounting plate 20 is conducive to improving the structural strength of the blade body 10.

[0045] In this embodiment, a plurality of counterweight structures 30 are provided, and the plurality of counterweight structures 30 are arranged at intervals along the length and / or width of the mounting plate 20. The counterweight structures 30 are arranged at intervals along the length direction and the width direction of the mounting plate 20. The plurality of counterweight structures 30 are arranged on the same vertical plane, which is conducive to adjusting the center of gravity position, thereby improving the operating stability of the fan blades.

[0046] In this embodiment, in order to further ensure that the setting of the counterweight structure 30 can achieve the adjustment of the center of gravity, the fan blade of the present application also includes a first counterweight block, and the first counterweight block can be optionally arranged inside the counterweight structure 30. Specifically, the first counterweight block is arranged inside the counterweight structure 30 to form an integral structure with the first counterweight block and the counterweight structure 30, and the integral structure can achieve the adjustment of the position of the center of gravity.

[0047] Wherein, the first counterweight block is a metal weight.

[0048] There are one or more first counterweight blocks, and the multiple first counterweight blocks can be arranged inside the same counterweight structure 30 , or the multiple first counterweight blocks can be arranged corresponding to the multiple counterweight structures 30 .

[0049] In this embodiment, a plurality of counterweight structures 30 are provided, and the first counterweight block is provided in some of the counterweight structures 30 among the plurality of counterweight structures 30. The first counterweight block is provided inside some of the counterweight structures 30 to form a heavier structure, and the counterweight structures 30 without the first counterweight block are lighter in weight, so as to be adaptively provided inside the inner cavity along the length direction of the wind blade body 10.

[0050] In another embodiment, a first counterweight block is provided in each counterweight structure 30. The first counterweight block is provided in each counterweight structure 30, which is conducive to ensuring that the structure formed by each counterweight structure 30 and the first counterweight block is evenly arranged, thereby improving the structural stability of the fan blade.

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

[0052] The web 40 is a web 40 structure in the prior art.

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

[0054] Specifically, the web 40 is used as a carrier of the second counterweight 50, and the internal structure of the fan blade is reasonably utilized, thereby improving the assembly efficiency. The second counterweight 50 is arranged on the web 40, so as to adjust the center of gravity and ensure the stability of the fan blade.

[0055] Furthermore, a plurality of second counterweight blocks 50 may be provided, and the provision of a plurality of second counterweight blocks 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 40 has a slide groove 410 extending along the length direction of the wind blade body 10 , and the second counterweight 50 is slidably disposed on the slide groove 410 .

[0057] Specifically, the structure of the slide groove 410 and the second counterweight block 50 is adopted to enable the second counterweight block 50 to be adjusted along the length direction 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 block 50, which is beneficial to improving the range of usage scenarios of the fan blades.

[0058] In this embodiment, the structure of the slide 410 and the second counterweight 50 is adopted, and the position of the second counterweight 50 can be adjusted during the operation of the fan blades, so as to realize the adaptive balance of the fan blades, which is particularly suitable for wind power generation systems that need to maintain stable operation under extreme wind speed conditions, such as areas encountering typhoons or hurricanes. The dynamic adjustment mechanism of the slide 410 and the second counterweight 50 enables the fan blades to adjust their center of gravity in real time when facing extreme weather such as typhoons or hurricanes, reduce the force on the fan blades, and protect the equipment from damage. For those 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 lamination structure, which is arranged on the surface of the blade body 10. The lamination structure has a first part and a second part arranged along the length direction of the blade body 10. The first part is arranged between the blade root 110 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.

[0060] Specifically, the weight distribution design of the ply structure not only optimizes the mechanical properties of the blades, but also enhances the wind resistance and service life of the blades. It is suitable for wind turbines that need to operate in high wind speed environments, such as tunnel ventilation systems for high-speed railways or wind power plants under extreme climate conditions. This ply structure with optimized weight distribution effectively improves the wind resistance of the blades by adding weight to key areas. For the ventilation system of high-speed railway tunnels, it can ensure that the blades can still operate stably when the train passes at high speed, reduce air resistance, and improve the stability and safety of train operation; for wind power plants under extreme climate conditions, this design can ensure that the blades can still maintain the best operating state in harsh environments such as strong winds and low temperatures, extending the service life of the equipment and reducing operation and maintenance costs.

[0061] In this embodiment, the difference in weight between the first part and the second part may be due to the material density of the first part being greater than the material sealing of the second part, or the first part and the second part being made of the same material and the thickness of the first part being greater than the thickness of the second part, or the surface of the ply structure at the first part being coated.

[0062] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0063] The fan blade of the present application adopts a counterweight structure 30 set inside the blade body 10 to adjust the distribution of the center of gravity of the fan blade, so that compared with the prior art, the center of gravity of the fan blade of the present application moves toward 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.

[0064] The present application arranges a counterweight structure 30 inside the fan blade to move the center of gravity of the blade toward the blade root 110 area, thereby reducing the bending moment of the fan blade and improving the stability of the blade, which is beneficial to achieving the purpose of load reduction and improving the gas-elastic coupling effect.

[0065] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0066] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0067] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fan blade, characterized in that: include: A fan blade body (10), wherein the fan blade body (10) has an inner cavity, and along the length direction, the fan blade body (10) has a blade root (110) and a blade tip (120) at the end; A counterweight structure (30) is arranged inside the inner cavity, along the length direction of the fan blade body (10), and the counterweight structure (30) is arranged between the blade root (110) and the plane where the center of gravity of the fan blade body (10) is located.

2. The fan blade according to claim 1, characterized in that: The counterweight structure (30) is arranged on the inner surface of the inner cavity.

3. The fan blade according to claim 2, characterized in that: A plurality of the counterweight structures (30) are provided, and the plurality of the counterweight structures (30) are arranged at intervals along the length direction of the wind blade body (10); and / or A plurality of the counterweight structures (30) are provided, and the inner cavity has a first surface and a second surface that are arranged opposite to each other along the height direction of the fan blade body (10), and at least one of the counterweight structures (30) is provided on each of the first surface and the second surface.

4. The fan blade according to claim 1, characterized in that: The inner cavity has a mounting plate (20) arranged along the height direction of the fan blade body (10); along the length direction of the fan blade body (10), the mounting plate (20) is arranged between the blade root (110) and the plane where the center of gravity is located; and the counterweight structure (30) is arranged on the mounting plate (20).

5. The fan blade according to claim 4, characterized in that: A plurality of the counterweight structures (30) are provided, and the plurality of counterweight structures (30) are arranged at intervals along the length and / or width of the mounting plate (20).

6. The fan blade according to claim 1, characterized in that: The fan blade further comprises a first counterweight block, which can be selectively arranged inside the counterweight structure (30), and the counterweight structure (30) is provided with a plurality of Some of the counterweight structures (30) among the plurality of counterweight structures (30) are provided with the first counterweight block; or Each of the counterweight structures (30) is provided with the first counterweight block.

7. The fan blade according to any one of claims 1 to 6, characterized in that: The fan blades also include: a web (40), wherein the web (40) is arranged in the inner cavity, and the web (40) extends along the length direction of the fan blade body (10); A second counterweight (50), wherein the second counterweight (50) is arranged on the web (40), and along the length direction of the wind blade body (10), the second counterweight (50) is arranged between the blade root (110) and the plane where the center of gravity is located.

8. The fan blade according to claim 7, characterized in that: The web (40) has a slide groove (410) extending along the length direction of the fan blade body (10), and the second counterweight block (50) is slidably arranged on the slide groove (410).

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

10. A fan, characterized in that: The invention comprises the fan blade according to any one of claims 1 to 9.

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