Internal reinforcing structure of wind power blade

Abstract

The utility model relates to the technical field of wind power blades, and discloses an internal reinforcing structure of a wind power blade, which comprises a D-shaped main beam and a triangular reinforcing rib plate, and the D-shaped main beam is arranged in the wind power blade as a main bearing component and is glued with a skin on the inner surface of the wind power blade; the D-shaped main beam comprises two beam caps and two shear webs; the two beam caps are glued on the upper and lower inner side surfaces of the wind power blade; the two shear webs are positioned on the left and right sides of the two beam caps and are connected with the two beam caps; the triangular reinforcing rib plate is arranged on the inner side of the D-shaped main beam and used for improving the structural strength of the D-shaped main beam, and the upper end and the lower end of the triangular reinforcing rib plate are connected with the two beam caps respectively. Due to the design of the D-shaped main beam and the triangular reinforcing rib plates, higher structural strength and rigidity are provided, various complex loads can be effectively borne, and deformation and damage are reduced. And the design of the carbon fiber composite material and the foam sandwich is adopted, so that the strength and rigidity of the structure are kept, the light weight is realized, and the operation energy consumption is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind turbine blades, and particularly relates to an internal strengthening structure of a wind turbine blade. Background Technique

[0002] With the continuous development of wind power generation technology, as a key component of a wind turbine generator set, the performance of a wind turbine blade directly affects the efficiency and reliability of the entire power generation system. During operation, a wind turbine blade needs to withstand extremely large wind loads, including composite loads such as tension, compression, shear, and torsion. In order to improve the structural strength and stiffness of the blade while maintaining its light weight, the design of the internal strengthening structure has become an important research direction.

[0003] Traditional internal strengthening structures of wind turbine blades usually adopt simple support frames or main beam designs made of a single material. These designs have certain limitations in improving the blade performance. The existing internal strengthening structures of blades may not be able to provide sufficient strength and stiffness to cope with complex load conditions, resulting in deformation or damage of the blades during use. Traditional strengthening structures may use metal materials. Although these materials have high strength, they are relatively heavy, increasing the self-weight of the blade and thus increasing the operating energy consumption of the wind turbine generator set. During long-term operation, fatigue damage of the blade is one of the main reasons for failure. The existing strengthening structures may not be able to effectively disperse and transfer loads, resulting in local stress concentration and thus shortening the fatigue life of the blade. Due to the limitations of structural strength and fatigue life, the existing blades may require more frequent inspections and repairs, increasing the maintenance cost.

[0004] Therefore, we propose an internal strengthening structure of a wind turbine blade to solve the above problems. Content of the Utility Model

[0005] The present invention aims to solve the technical problem that in the above-mentioned prior art, the use of a simple support frame or a main beam design made of a single material may not be able to provide sufficient strength and stiffness to cope with complex load conditions.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] An internal strengthening structure of a wind turbine blade, comprising:

[0008] A D-shaped main beam, which is arranged inside the wind turbine blade as a main load-bearing component and is adhesively bonded to the skin on the inner surface of the wind turbine blade; the D-shaped main beam includes two beam caps adhesively bonded to the upper and lower inner sides of the wind turbine blade and two shear webs located on the left and right sides of the two beam caps and connecting the two beam caps.

[0009] The triangular reinforcing rib plate is provided inside the D-shaped main beam and is used to increase the structural strength of the D-shaped main beam. The upper and lower ends of the triangular reinforcing rib plate are respectively connected to two beam caps.

[0010] Preferably, flanges A that are bent inward at the upper and lower ends of the shear web and are bonded to the beam cap by a resin-based structural adhesive are provided.

[0011] Preferably, the shear web includes symmetrically double-laid carbon fiber composite layers A and a foam core A located in the middle of the carbon fiber composite layers A. The thickness of the shear web is 40 mm. The carbon fiber composite layers A provide the characteristics of high strength and light weight, which helps to improve the strength of the shear web while keeping the overall weight of the blade relatively light. The foam core A provides additional support between the two layers of carbon fiber, increasing the structural stiffness and also achieving a weight reduction effect.

[0012] Preferably, the beam cap includes symmetrically double-laid carbon fiber composite layers B and a unidirectionally laid carbon fiber composite layer C located between the carbon fiber composite layers B. The thickness of the beam cap is 20 mm. The symmetrically double-laid carbon fiber composite layers B provide good strength and stiffness, while the unidirectionally laid carbon fiber composite layer C can optimize the material properties according to the stress direction.

[0013] Preferably, the triangular reinforcing rib plate includes an inverted V-shaped plate and three inner and outer flanges B at the three ends of the inverted V-shaped plate. The design of the inverted V-shaped plate can effectively disperse and transfer the loads received by the blade, improving the load-bearing capacity of the triangular reinforcing rib plate. The design of the inner and outer flanges B increases the connection area between the triangular reinforcing rib plate and the beam cap, improving the overall stability of the structure.

[0014] Preferably, the three inner and outer flanges B are bonded to the beam cap by a resin-based structural adhesive.

[0015] Preferably, the triangular reinforcing rib plate includes symmetrically double-laid carbon fiber composite layers D and a foam core B located in the middle of the carbon fiber composite layers D. The thickness of the triangular reinforcing rib plate is 40 mm. Similar to the shear web, this design can provide the characteristics of high strength, stiffness, and light weight, which helps to improve the operating efficiency and lifespan of the blade.

[0016] Compared with the prior art, the technical effects and advantages of the present utility model are:

[0017] The internal strengthening structure of this wind turbine blade. The D-shaped main beam, as the main load-bearing component inside the blade, is adhesively bonded to the skin on the inner surface of the blade through the shear webs on both sides and the beam caps on the upper and lower sides, forming a closed D-shaped structure. The flange A of the shear web is bonded to the beam cap through a resin-based structural adhesive, increasing the bonding area and strength, and improving the overall stability of the structure. The shear web adopts a double-layer carbon fiber composite layer A and a foam core A. This design provides high strength and lightweight characteristics while increasing the stiffness of the structure and ensuring sufficient shear resistance through a thickness of 40 mm. The beam cap also adopts a carbon fiber composite layer B and a unidirectional carbon fiber composite layer C to adapt to different stress directions and maintain a thickness of 20 mm to ensure strength and lightweight.

[0018] The triangular strengthening rib plate is connected to the beam cap of the D-shaped main beam through an inverted V-shaped plate and three inner and outer flanges B, further enhancing the stability and load-bearing capacity of the structure, and ensuring the reliability of the connection through a resin-based structural adhesive.

[0019] The design of the D-shaped main beam can effectively withstand various external loads, reduce the deformation and damage of the blade, and improve the stability and durability of the blade. The addition of the shear web and the triangular strengthening rib plate enables the loads on the blade to be more evenly distributed over the entire structure, reducing local stress concentration, and thus reducing the damage to the blade caused by excessive stress. The setting of the shear web and the triangular strengthening rib plate significantly improves the shear resistance of the blade, preventing the blade from suffering structural failure due to excessive shear force during rotation.

[0020] Due to the improvement of structural strength and the optimization of load distribution, the fatigue life of the blade is extended, the maintenance frequency and cost are reduced, and the efficiency and economy of wind power generation are improved. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the present utility model;

[0022] Figure 2 It is a front view of the present utility model;

[0023] Figure 3 It is a schematic structural diagram of the shear web of the present utility model;

[0024] Figure 4 It is a schematic structural diagram of the beam cap of the present utility model;

[0025] Figure 5 It is a schematic structural diagram of the angle strengthening rib plate of the present utility model.

[0026] In the figure: 1. D-shaped main beam; 2. Wind turbine blade; 3. Beam cap; 4. Shear web; 5. Triangular reinforcing rib; 6. Flange A; 7. Carbon fiber composite material layer A; 8. Foam core A; 9. Carbon fiber composite material layer B; 10. Carbon fiber composite material layer C; 11. Inverted V-shaped plate; 12. Inner and outer flanges B; 13. Carbon fiber composite material layer D; 14. Foam core B. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] The following is combined with Figures 1-5 To further explain this application,

[0029] The embodiment of the present application discloses an internal reinforcement structure of a wind turbine blade, comprising a D-shaped main beam 1 and a triangular reinforcement rib 5. The D-shaped main beam 1 is provided inside the wind turbine blade 2 as the main load-bearing component and is glued to the skin of the inner surface of the wind turbine blade 2; the triangular reinforcement rib 5 is provided on the inner side of the D-shaped main beam 1 and is used to increase the structural strength of the D-shaped main beam 1;

[0030] The D-shaped main beam 1 includes two beam caps 3 glued to the upper and lower inner sides of the wind turbine blade 2 and two shear webs 4 located on the left and right sides of the two beam caps 3 and connected to the two beam caps 3;

[0031] The upper and lower ends of the shear web 4 are each provided with inwardly bent flanges A6, which are bonded to the spar cap 3 via a resin-based structural adhesive. The design of flanges A6 increases the bonding area between the shear web 4 and the spar cap 3, thereby improving the bonding strength and overall structural stability. The inward bending of flanges A6 helps disperse stress on the blade when subjected to shear forces, reducing stress concentration and improving the durability of the structure. Through the bonding of the resin-based structural adhesive, flanges A6 effectively transfer shear forces, avoiding structural failure caused by weak bonding.

[0032] The shear web 4 includes a symmetrically double-layered carbon fiber composite layer A7 and a foam core A8 located in the middle of the carbon fiber composite layer A7. The thickness of the shear web 4 is 40 mm. The carbon fiber composite layer A7 provides the characteristics of high strength and light weight, which helps to improve the strength of the shear web 4 while keeping the overall weight of the blade relatively light. The foam core A8 provides additional support between the two carbon fiber layers, increasing the structural stiffness and also having a weight reduction effect. The design with a thickness of 40 mm can provide sufficient shear resistance while maintaining the rationality of the structure. The thickness of the foam core A8 is greater than that of the symmetrically double-layered carbon fiber composite layer A7.

[0033] The beam cap 3 includes a symmetrically double-layered carbon fiber composite layer B9 and a unidirectionally laid carbon fiber composite layer C10 located between the carbon fiber composite layer B9. The thickness of the beam cap 3 is 20 mm. The symmetrically double-layered carbon fiber composite layer B9 provides good strength and stiffness, while the unidirectionally laid carbon fiber composite layer C10 can optimize the material properties according to the stress direction. This design can effectively withstand various forces on the blade during operation, including tensile, compressive, and shear forces. The thickness of the beam cap 3 being 20 mm can maintain the structural strength while avoiding excessive weight gain. The thickness of the carbon fiber composite layer B9 is the same as that of the carbon fiber composite layer C10.

[0034] The upper and lower ends of the triangular reinforcing rib plate 5 are respectively connected to two beam caps 3. The triangular reinforcing rib plate 5 includes an inverted V-shaped plate 11 and three inner and outer flanges B12 located at the three ends of the inverted V-shaped plate 11. The design of the inverted V-shaped plate 11 can effectively disperse and transfer the loads received by the blade, improving the load-bearing capacity of the triangular reinforcing rib plate 5. The design of the inner and outer flanges B12 increases the connection area between the triangular reinforcing rib plate 5 and the beam cap 3, improving the overall stability of the structure. The three inner and outer flanges B12 are bonded to the beam cap 3 with a resin-based structural adhesive. Using a resin-based structural adhesive for bonding can provide good bonding strength, ensuring a reliable connection between the rib plate and the beam cap 3. This bonding method helps to disperse stress and reduce structural failure caused by stress concentration.

[0035] The triangular reinforcing rib plate 5 includes a symmetrically double-layered carbon fiber composite layer D13 and a foam core B14 located in the middle of the carbon fiber composite layer D13. The thickness of the triangular reinforcing rib plate 5 is 40 mm. Similar to the shear web 4, this design can provide the characteristics of high strength, stiffness, and light weight, which helps to improve the operating efficiency and lifespan of the blade. The design with a thickness of 40 mm can provide sufficient strength and stiffness to withstand various loads on the blade during operation. The thickness of the foam core B14 is greater than that of the symmetrically double-layered carbon fiber composite layer D13.

[0036] The design of the D-shaped main beam 1 in the internal strengthening structure of this wind turbine blade provides good structural stability. Its two beam caps 3 and two shear webs 4 form a closed D-shaped structure, which can effectively withstand various loads from the outside of the blade, including tensile, compressive, and shear forces. The setting of the shear web 4 increases the shear resistance of the main beam, helps to resist the shear force generated during the rotation of the blade, and prevents the blade from suffering structural damage due to excessive shear force. The design of the D-shaped main beam 1 helps to evenly distribute the loads received by the blade onto the entire main beam, reducing the concentration of local stress in the blade, thereby improving the overall durability of the blade. The evenly distributed loads and enhanced structural stability help to reduce the fatigue damage of the blade during long-term operation, thus extending the service life of the blade.

[0037] The triangular stiffening rib plate 5 increases the structural strength of the D-shaped main beam 1, enabling the blade to more effectively withstand pressure when subjected to loads. Due to the good stability of the triangle, this structural design can greatly improve the overall strength of the wind turbine blade 2. The triangular stiffening rib plate 5 connects the two beam caps 3, helping to improve the shear resistance of the D-shaped main beam 1. During the operation of the blade, shear forces from various directions will be received. The triangular stiffening rib plate 5 can effectively resist these shear forces and prevent structural failure. The triangular stiffening rib plate 5 helps to evenly transfer the loads received by the blade to various parts of the D-shaped main beam 1, thereby reducing the concentration of local stress in the blade and reducing the damage caused by excessive stress in the blade. By enhancing the stability of the internal structure of the blade, the triangular stiffening rib plate 5 helps to improve the fatigue life of the blade. During the operation of the blade, fatigue damage is one of the main reasons for blade failure. Therefore, improving the fatigue life of the blade is of great significance for reducing maintenance costs and improving wind power generation efficiency. On the premise of ensuring structural strength, the design of the triangular stiffening rib plate 5 can reduce the weight of the blade, thereby reducing the energy consumption during the operation of the blade and improving wind power generation efficiency.

[0038] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An internal strengthening structure for a wind turbine blade, characterized in that Comprising: A D-shaped main beam (1), the D-shaped main beam (1) is arranged inside the wind turbine blade (2) as the main load-bearing component and is adhesively bonded to the skin on the inner surface of the wind turbine blade (2); the D-shaped main beam (1) includes two beam caps (3) adhesively bonded to the upper and lower inner sides of the wind turbine blade (2) and two shear webs (4) located on the left and right sides of the two beam caps (3) and connecting the two beam caps (3). Triangular stiffening rib plates (5), the triangular stiffening rib plates (5) are arranged inside the D-shaped main beam (1) and are used to increase the structural strength of the D-shaped main beam (1), and the upper and lower ends of the triangular stiffening rib plates (5) are respectively connected to the two beam caps (3).

2. The internal strengthening structure of a wind turbine blade according to claim 1, wherein: Flanges A (6) that are bent inward at the upper and lower ends of the shear web (4) and are adhesively bonded to the beam cap (3) by a resin-based structural adhesive.

3. The internal strengthening structure of a wind turbine blade according to claim 1, characterized in that: The shear web (4) includes a symmetrically double-layered carbon fiber composite layer A (7) and a foam core A (8) located in the middle of the carbon fiber composite layer A (7), and the thickness of the shear web (4) is 40 mm.

4. The internal strengthening structure of a wind turbine blade according to claim 1, characterized in that: The beam cap (3) includes a symmetrically double-layered carbon fiber composite layer B (9) and a unidirectionally laid carbon fiber composite layer C (10) located between the carbon fiber composite layer B (9), and the thickness of the beam cap (3) is 20 mm.

5. The internal strengthening structure of a wind turbine blade according to claim 1, characterized in that: The triangular stiffening rib plate (5) includes an inverted V-shaped plate (11) and three inner and outer flanges B (12) located at the three ends of the inverted V-shaped plate (11).

6. The internal strengthening structure of a wind turbine blade according to claim 5, characterized in that: The three inner and outer flanges B (12) are adhesively bonded to the beam cap (3) by a resin-based structural adhesive.

7. The internal strengthening structure of a wind turbine blade according to claim 5, characterized in that: The triangular stiffening rib plate (5) includes a symmetrically double-layered carbon fiber composite layer D (13) and a foam core B (14) located in the middle of the carbon fiber composite layer D (13), and the thickness of the triangular stiffening rib plate (5) is 40 mm.

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