Fan blade and fan

Abstract

The application provides a fan blade and a fan, the fan blade comprises a blade body and a layup structure, the layup structure is arranged on the surface of the blade body, the layup structure comprises a plurality of layup segments arranged along the length direction of the blade body, the layup angles of two adjacent layup segments are different, and each layup segment comprises a plurality of layups arranged in the same direction. The fan blade of the application adopts a segmented layup structure, the layup angles of different layup segments are adjusted to adapt to the load of different regions on the blade body, the overall strength and rigidity of the blade are improved, the vibration and noise in the running process are reduced, the service life of the blade is prolonged, the aerodynamic performance of the blade is optimized, the wind energy conversion efficiency is improved, and the problem that the overall load management efficiency of the fan blade is low due to the single layup structure of the fan blade in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generation equipment, in particular to a wind turbine blade and a wind turbine. BACKGROUND

[0002] With the development of wind power technology, especially in the development of large-scale power generation units in offshore wind farms and low wind speed areas on land, the power of the power generation unit is getting larger and larger, and the length of the wind turbine blade is getting longer. Among them, the structural design of the wind turbine blade mainly focuses on the layup of the blade.

[0003] Wind power, as an important part of renewable energy, has developed rapidly worldwide in recent years, especially in the fields of offshore wind power and low wind speed wind power. With the progress of wind power technology and the driving of market demand, the single machine capacity of wind turbine generators is continuously increasing, and the length of the blade has gradually grown from about 30 meters to more than 100 meters, and even the longest wind turbine blade in the world has reached 126 meters, matching the 16-18MW offshore wind turbine generator. This trend of large-scale has improved the efficiency and economic benefits of wind energy utilization, but it has also brought new technical challenges, especially in the field of aerodynamic-structural dynamics.

[0004] Large wind turbine blades, as a typical long and flexible structure, will deform elastically under the action of aerodynamic load. In the prior art, the layup design of the wind turbine blade often uses a unified structure and material distribution, i.e. using the same or similar fiber direction angle and layup thickness to construct the structure of the blade throughout the length of the blade. This design method, although simplifies the manufacturing process to some extent, ignores the differences in force characteristics of different regions of the blade, resulting in low efficiency of overall load management. Specifically, the root and tip of the blade body differ significantly in the load they bear during operation, with the root needing to bear greater bending moment and torque, while the tip is more affected by the aerodynamic load caused by wind speed changes. Especially under high wind speed conditions, the aeroelastic stability of the wind turbine blade is poor, and the vibration and distortion of the blade may intensify, affecting its long-term operation reliability and service life.

[0005] As can be seen from the above, the single layup structure of the wind turbine blade in the prior art leads to low efficiency of overall load management of the blade. SUMMARY

[0006] The main purpose of the present application is to provide a wind turbine blade and a wind turbine to solve the problem of low efficiency of overall load management of the blade caused by the single layup structure of the wind turbine blade in the prior art.

[0007] In order to achieve the above object, according to one aspect of the present application, a fan blade is provided, which comprises a blade body and a layup structure arranged on a surface of the blade body, the layup structure comprising a plurality of layup sections arranged along a length direction of the blade body, the layup angle of any two adjacent layup sections being different, and each layup section comprising a plurality of layup layers arranged in the same direction.

[0008] Further, the layup structure comprises two layup sections, and the included angle A between the extension directions of the two layup sections satisfies 0°<A≤45°.

[0009] Further, the two layup sections are a first layup section and a second layup section, the first layup section is arranged close to the root of the blade body, and the extension direction of the first layup section is the same as the extension direction of the blade body, and the second layup section extends towards the side away from the root of the blade body and towards the top side of the blade body; or the second layup section extends towards the side away from the root of the blade body and towards the bottom side of the blade body.

[0010] Further, the extension length of the first layup section accounts for 50%-80% of the length of the blade body.

[0011] Further, the layup structure comprises a root layup section, a middle layup section and an end layup section arranged in sequence along the length direction of the blade body, the layup angle of the root layup section, the middle layup section and the end layup section are all different, and the extension direction of the root layup section and the end layup section are both arranged at an angle with the length direction of the blade body.

[0012] Further, one of the root layup section and the end layup section extends towards the side away from the root of the blade body and towards the top side of the blade body, and the other of the root layup section and the end layup section extends towards the side away from the root of the blade body and towards the bottom side of the blade body.

[0013] Further, the extension direction of the middle layup section is the same as the extension direction of the blade body.

[0014] Further, the middle layup section is provided with one or more, and when the middle layup section is provided with a plurality of middle layup sections, the extension direction of at least one of the plurality of middle layup sections is the same as the extension direction of the blade body.

[0015] Further, along the length direction of the blade body, the extension direction of the root layup section accounts for 50%-60% of the length of the blade body, and the extension direction of the middle layup section accounts for 10%-20% of the length of the blade body.

[0016] According to another aspect of the present application, a fan is provided, which comprises the above-mentioned fan blade.

[0017] The fan blade of the application comprises a blade body and a laying structure, the laying structure is arranged on the surface of the blade body, the laying structure comprises a plurality of laying sections arranged along the length direction of the blade body, the laying angles of adjacent two laying sections are different, and each laying section comprises a plurality of laying layers arranged in the same direction.

[0018] As can be seen from the above, the fan blade of the application adopts a segmented laying structure, the laying angles of different laying sections are adjusted to adapt to the load of different regions on the blade body, the overall strength and rigidity of the blade are improved, the vibration and noise in the running process are reduced, the service life of the blade is prolonged, the aerodynamic performance of the blade is optimized, and the wind energy conversion efficiency is improved.

[0019] The segmented laying structure adopted by the application enables the fan blade to run more stably when facing different wind speeds and directions, reduces the structural fatigue caused by the vibration of the fan blade, prolongs the service life of the fan blade and the stability of the operation of the fan, and thus is conducive to improving the power generation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of the application form a part of the application and serve to provide further understanding of the application, the exemplary embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0021] Figure 1 One of the schematic diagrams of the fan blade of the application is shown, wherein the laying section is provided with two;

[0022] Figure 2 Another one of the schematic diagrams of the fan blade of the application is shown, wherein the laying section is provided with two;

[0023] Figure 3 Another one of the schematic diagrams of the fan blade of the application is shown, wherein the laying section is provided with two;

[0024] Figure 4 Another one of the schematic diagrams of the fan blade of the application is shown, wherein the laying section is provided with two;

[0025] Figure 5 A schematic diagram of the fan blade of the application is shown, wherein the laying section is provided with three.

[0026] In the above drawings, the following reference signs are included:

[0027] 10, blade body; 110, root; 120, blade tip; 20, laying structure; 210, first laying section; 220, second laying section; 230, root laying section; 240, middle laying section; 250, end laying section. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0030] In the present application, unless otherwise specified, the orientation words such as "upper, lower, top, bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0031] Embodiment one

[0032] In order to solve the problem of low efficiency of overall load management of the fan blade caused by the single layer structure of the fan blade in the prior art, the present application provides a fan.

[0033] Among them, the fan of the present application is a large wind turbine, which is applied to offshore wind farms.

[0034] Specifically, the fan includes a fan body and a fan blade arranged on the fan body, and the fan body drives the fan blade to rotate.

[0035] In the present embodiment, by fine and segmented design according to the stress characteristics of different regions of the fan blade, the load of the fan blade is effectively managed and reduced, and the structural strength and aeroelastic stability of the fan blade are improved, thereby prolonging the service life of the fan blade and the stability of the operation of the fan, and further improving the power generation efficiency.

[0036] As shown in Figures 1 to 4 The fan blade includes a blade body 10 and a layer structure 20, the layer structure 20 is arranged on the surface of the blade body 10, and the layer structure 20 includes a plurality of laying segments arranged along the length direction of the blade body 10, the laying angles of adjacent two laying segments are different, and each laying segment includes a plurality of layers arranged in the same direction.

[0037] The two adjacent laying sections have different laying angles, so that the laying structure 20 is segmented, the fan blade is segmented and laid according to different load resistances of different regions of the fan blade, different angles of the laying structure are arranged in different regions, different laying sections with different fiber direction angles are realized, and the bending and stiffness of each region are optimized to the greatest extent, and the load reduction effect of the entire fan blade is enhanced.

[0038] Specifically, compared with the structure of the prior art in which the same or similar fiber direction angle and laying thickness are used on the entire blade length to construct the blade, the fan blade of the application adopts the segmented laying structure 20, the laying angles of different laying sections are adjusted to adapt to the load of different regions on the blade body 10, the overall strength and rigidity of the blade are improved, the vibration and noise in the running process are reduced, the service life of the blade is prolonged, the aerodynamic performance of the blade is optimized, and the wind energy conversion efficiency is improved.

[0039] In the embodiment, the segmented laying structure 20 makes the fan blade more stable when facing different wind speeds and directions, reduces the structural fatigue caused by the vibration of the fan blade, and prolongs the service life of the fan blade.

[0040] In the embodiment, the laying structure 20 includes two laying sections.

[0041] The included angle A between the extension directions of the two laying sections satisfies 0°<A≤45°. The angle setting makes the blade better disperse the load when bearing the wind force, thereby improving the strength and fatigue resistance of the blade, and is suitable for wind farms with large wind force changes. The wind force changes frequently and the wind speed is high in these places, and higher requirements are put forward for the wind resistance of the blade. After the design is implemented, the blade can more effectively disperse the wind load, reduce local damage, prolong the maintenance cycle of the fan blade, and reduce the maintenance cost.

[0042] It can be understood that the included angle A between the extension directions of the two laying sections can be 10°, 20°, 30°, 40°, etc. The included angle A between the extension directions of the two laying sections can be a clockwise angle or a counterclockwise angle.

[0043] In the embodiment, the length direction of the blade body 10 is the X direction shown in the figure. Figures 1 to 5

[0044] ​Specifically, the first laying section 210 is arranged near the root 110 of the blade body 10, and the second laying section 220 is arranged near the tip 120 of the blade body 10, that is, the second laying section 220 is arranged near the side of the tip 120 of the blade body 10. The extension direction of the first laying section 210 is the same as the extension direction of the blade body 10, and the extension direction of the second laying section 220 is arranged at an angle relative to the extension direction of the first laying section 210.

[0045] The present application adjusts the fiber direction angle by adjusting the layup structure 20 at the tail of the blade body 10 which mainly affects the overall load, so as to adjust the bending and stiffness of the blade body 10 to achieve the effect of reducing the load.

[0046] In actual work process, the tip 120 area of the blade body 10 is the area mainly needed to reduce the load, so the fiber direction angle can be optimized by adjusting the angle of the layup of the tip 120 area in a segmented manner, so as to optimize the bending and stiffness of the tip 120 area and enhance the effect of reducing the load.

[0047] In one of the specific embodiments of the present embodiment, the second laying section 220 extends towards the side away from the root 110 of the blade body 10 and towards the top side of the blade body 10.

[0048] In another of the specific embodiments of the present embodiment, the second laying section 220 extends towards the side away from the root 110 of the blade body 10 and towards the bottom side of the blade body 10.

[0049] In the present embodiment, the second laying section 220 is adaptively arranged according to the load borne by the tip 120 in the environment of the blade body 10, the rotation direction of the blade body 10, and the like, for example, the angle of the second laying section 220 is different between the clockwise rotating blade body 10 and the counterclockwise rotating blade body 10.

[0050] In the embodiment, the extension length of the first laying section 210 of the first laying section 210 accounts for 50%-80% of the length of the blade body 10. Among them, the setting of such a proportion makes the blade body 10 have higher strength and rigidity from the root 110 to the middle region, which can effectively resist the bending and torsion caused by wind force, and is suitable for the stable operation of the wind turbine under high wind speed conditions, such as the use of offshore wind farms. By setting the extension direction of the first laying section 210 to be 50%-80% of the length of the blade body 10, not only the strength and rigidity of the blade body 10 from the root 110 to the middle region are improved, but also the dynamic response of the blade under high wind speed conditions can be effectively reduced, the bending and torsion caused by wind force are reduced, and the stable operation of the blade in high wind speed environments such as offshore wind farms is ensured. This design can also reduce the noise of the blade during operation, improve the overall operation efficiency and environmental friendliness of the wind turbine.

[0051] Embodiment two

[0052] Different from embodiment one, in the embodiment, the number of laying sections is greater than two.

[0053] Specifically, the number of laying sections can be 3, 4, 5, etc.

[0054] In the embodiment, as shown in Figure 5 , the laying structure 20 includes a root laying section 230, a middle laying section 240 and an end laying section 250 arranged in sequence along the length direction of the blade body 10, the laying angles of the root laying section 230, the middle laying section 240 and the end laying section 250 are all different, and the extension directions of the root laying section 230 and the end laying section 250 are both arranged at an angle with the length direction of the blade body 10.

[0055] Among them, the middle laying section 240 is provided with one or more, when the middle laying section 240 is provided with one, the total number of corresponding laying sections is 3, when the laying section is provided with n, n is an integer greater than 1, and the total number of laying sections is n+2.

[0056] Specifically, such segmented laying mode can be optimized and designed according to the stress characteristics of different parts of the fan blade, improve the overall structural stability and aerodynamic efficiency, and is suitable for the design of fan blades of various wind turbines, especially in wind power projects that need to consider the overall performance and service life of the blade.

[0057] In the embodiment, the root laying section 230 can enhance the connection strength of the blade and the hub, the middle laying section 240 can optimize the wind resistance performance of the blade, and the end laying section 250 can improve the aerodynamic efficiency of the blade, so that the blade can exhibit better performance in various wind turbines. This design can significantly prolong the service life of the blade, reduce downtime caused by blade damage, and improve the power generation efficiency and economic benefits of the wind farm.

[0058] In the application, one of the root laying section 230 and the end laying section 250 extends towards the side away from the root 110 of the blade body 10 and towards the top side of the blade body 10, and the other of the root laying section 230 and the end laying section 250 extends towards the side away from the root 110 of the blade body 10 and towards the bottom side of the blade body 10, so as to adaptively set and improve the use efficiency of the fan blade and the power generation efficiency of the fan.

[0059] Specifically, the root laying section 230 is +30° along the length direction of the blade body 10, the middle laying section 240 is 0°, and the end laying section 250 is -20°. The positive and negative angles are set in different directions relative to the included angle of the length direction of the blade body 10, and the absolute value of the angle is less than or equal to 45°.

[0060] In the embodiment, when the middle laying section 240 is provided, the extension direction of the middle laying section 240 is the same as the extension direction of the blade body 10. By ensuring that the extension direction of the middle laying section 240 is the same as the extension direction of the blade body 10, the tensile strength of the middle part of the blade can be significantly enhanced under high wind speed conditions, effectively avoiding excessive stretching of the middle part of the blade due to wind force, and reducing the risk of blade damage. This design is particularly suitable for offshore wind power projects and wind farms that need to maintain the stability of the blade in high wind speed environment, and can significantly improve the overall wind resistance performance and operation safety of the wind turbine.

[0061] In the embodiment, when the middle laying section 240 is provided, the extension direction of the middle laying section 240 is the same as the extension direction of the blade body 10. By adopting multiple middle laying sections 240 in the middle region, not only the overall wind resistance performance of the blade can be enhanced, but also the aerodynamic efficiency can be further optimized, and the noise generated during wind power generation can be reduced. This fine design is particularly suitable for wind farms that pursue high efficiency and low noise, such as wind power projects near cities, which can significantly reduce noise.

[0062] In the embodiment, the extension direction of the root laying section 230 accounts for 50%-60% of the length of the blade body 10, and the extension direction of the middle laying section 240 accounts for 10%-20% of the length of the blade body 10. By controlling the extension proportions of the root laying section 230 and the middle laying section 240, the aerodynamic performance of the middle part can be optimized while ensuring the connection strength of the root 110 of the fan blade body 10, so that the overall structure of the fan blade can more effectively convert wind energy when facing wind load, and energy loss is reduced. The optimization of such proportions is particularly suitable for wind power projects that need to balance the strength and aerodynamic performance of the blade, which can improve power generation efficiency while ensuring the structural safety of the blade, prolonging its service life and reducing the operating cost of the wind farm.

[0063] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0064] The fan blade of the present application adopts a segmented laying structure 20, which adjusts the laying angles of different laying sections to adapt to the load of different areas on the blade body 10, improve the overall strength and rigidity of the blade, reduce vibration and noise during operation, prolong the service life of the blade, and also optimize the aerodynamic performance of the blade to improve the wind energy conversion efficiency.

[0065] The segmented laying structure 20 adopted by the present application enables the fan blade to operate more stably when facing different wind speeds and directions, reduces structural fatigue caused by vibration of the fan blade, thereby prolonging the service life of the fan blade and the stability of the fan operation, and further improving the power generation efficiency.

[0066] Obviously, the above-described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0067] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0068] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0069] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A fan blade, characterized in that: include: Blade body (10); A ply structure (20), the ply structure (20) being arranged on the surface of the blade body (10), the ply structure (20) comprising a plurality of ply sections arranged along the length direction of the blade body (10), the ply angles of two adjacent ply sections being different, and each ply section comprising a plurality of plies extending in the same direction; The ply structure (20) comprises a root ply section (230), a middle ply section (240), and an end ply section (250) sequentially arranged along the length direction of the blade body (10); the root ply section (230), the middle ply section (240), and the end ply section (250) have different ply angles; and the extension directions of the root ply section (230) and the end ply section (250) are both arranged at an angle to the length direction of the blade body (10); One of the root paving section (230) and the end paving section (250) extends toward a side away from the root (110) of the blade body (10) and toward a top side of the blade body (10); the other of the root paving section (230) and the end paving section (250) extends toward a side away from the root (110) of the blade body (10) and toward a bottom side of the blade body (10); the extension direction of the root paving section (230) accounts for 50%-60% of the length of the blade body (10); The extension direction of the middle paving section (240) is the same as the extension direction of the blade body (10); the extension direction of the middle paving section (240) accounts for 10%-20% of the length of the blade body (10).

2. The fan blade according to claim 1, characterized in that: One or more middle laying sections (240) are provided. When a plurality of middle laying sections (240) are provided, the extension direction of at least one of the plurality of middle laying sections (240) is the same as the extension direction of the blade body (10).

3. A fan, characterized in that: Including the wind turbine blade according to claim 1 or 2.

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