A wind turbine blade

Abstract

The present invention discloses a wind turbine blade, belonging to the technical field of wind power generation accessories. The wind turbine blade includes a center seat and a blade connected to the center seat. The blade includes a blade tip and an end sleeve. A main body is provided between the end sleeve and the blade tip. The main body has a symmetrically arranged blade leading edge and blade trailing edge. The present invention optimizes the relay component and installs the relay component at the root of the blade, so that the blade can tilt and swing. The two extreme positions of the swing can respectively correspond to the rotational drive and positioning lock of the blade, ensuring the position stability of the blade during use and protecting the rotational drive structure. The directional swing of the blade can prevent the blade from being excessively bent by the wind and contacting the wind turbine tower, ensuring the structural stability of the wind turbine equipment in harsh environments.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation accessories, and in particular relates to a wind power blade. Background Art

[0002] Wind turbine blades are the core components of wind turbines. Their design simulates the shape of bird wings to maximize the efficiency of capturing wind energy. They are usually made of glass fiber, carbon fiber or other composite materials, and are lightweight, high-strength and corrosion-resistant. The length of the blades can range from a few meters to tens of meters to accommodate wind turbines of different power levels. They convert the kinetic energy of wind into mechanical energy through rotation, and then convert it into electrical energy through generators. The design, materials and manufacturing process of wind turbine blades play a decisive role in the performance and reliability of wind turbines.

[0003] When designing and manufacturing existing wind turbine blades, high-strength materials such as carbon fiber or glass fiber and matrix materials such as epoxy resin are selected. Prepregs are laid by hand or automated equipment, and then vacuum infusion is performed in a closed mold to allow the resin to fully penetrate and solidify to form a strong blade structure. Surface treatment and painting are then performed to protect the blades from environmental erosion. In order to adapt to a service life of more than ten years, the blades are designed to be flexible structures to resist vibration and stress fatigue caused by long-term work. They can bend without breaking under strong wind conditions. However, because the blades need to be arranged facing the wind, the wind turbine tower is in a On the leeward side of the blade, the tip of the blade will bend toward the wind tower due to the wind, and the blade needs to be coaxially connected to the generator on the top of the wind tower, and the wind tower needs to bear the weight of the blade. Therefore, the distance between the blade and the wind tower cannot be significantly increased, which will cause the transmission structure to be too long. The distance between the center of the blade and the wind tower is too large, forming a force lever and causing the connection position to be subjected to excessive torsional force. However, in order to increase the swept area, the blade will gradually be designed to be longer. At this time, the bending span of the blade is larger, and the safe distance from the wind tower is insufficient in harsh environments, and even accidents caused by direct contact of the blade with the wind tower may occur. In view of this, a wind turbine blade is provided. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a wind turbine blade.

[0005] The technical solutions adopted to solve the above technical problems are:

[0006] A wind turbine blade, comprising a mid-seat and:

[0007] A fin connected to the center seat, the fin comprising a blade tip and an end sleeve, a main body being provided between the end sleeve and the blade tip, the main body having a symmetrically arranged fin leading edge and a fin trailing edge;

[0008] A relay member for connecting the middle seat and the end sleeve, the relay member includes a centering rotating member and a limiting frame, the centering rotating member passes through the mounting hole fixedly installed at the corresponding fin of the middle seat, the limiting frame can swing radially within the centering rotating member while the rotation center remains fixed, the end sleeve is coaxially connected to the limiting frame for rotation, and the swing of the limiting frame can cause the vertical fin to tilt away from the wind tower;

[0009] An attitude adjustment structure located inside the fin, which can bend and tilt the blade tip toward the leading edge of the fin;

[0010] A linear drive structure and a rotary drive structure are located inside the center seat. The linear drive structure can drive the limit frame to swing radially within the centering rotating member. The rotary drive structure can drive the fin to rotate in the limit frame through the end sleeve when the fin tilts away from the wind turbine tower.

[0011] The locking structure is located inside the middle seat and is installed opposite to the end sleeve. The locking structure is separated from the end sleeve when the fin is tilted, and is locked with the end sleeve when the fin is vertical.

[0012] Through the above technical solution, multiple fins are arranged in a circular array on a vertical plane, and the extension lines of the center lines of all the fins have a common intersection. The middle seat serves as a base and is installed at the intersection of the extension lines of multiple fins, and the rotation center of the middle seat passes through the intersection of the extension lines of the center lines of the fins. During installation, the middle seat is arranged horizontally front and back, and the rear end is connected to the rotating shaft of the wind tower, so that when the fins are blown by the wind, the wind turbine can be driven by the middle seat to rotate and generate electricity. When the angle of the fins needs to be adjusted, the fins are tilted forward in the direction away from the wind tower and contacted with the rotation drive structure for angle adjustment. After the fins are adjusted, the fins are reset to the vertical state and locked by a separately provided locking structure. At this time, the rotation drive The structure and the fins are separated from each other, and the instantaneous rotation of the fins when the locking structure fails will not damage the rotating drive structure. The forward tilt of the fins prevents the fins from being excessively bent and contacting the wind tower due to external force during the angle adjustment of the fins. In a strong wind environment, the fins change their angles and reduce the rotation speed. The attitude adjustment structure is used to bend the tips of the fins away from the wind tower to ensure the safety of the fins rotating in strong winds. In harsh environments, the leading edge of the fins is facing the wind to minimize the windward area and reduce the fin rotation speed. The attitude adjustment structure is used to further bend the tips of the fins away from the wind tower to counteract the bending tendency of the tips of the fins toward the wind tower in strong winds, which can improve the ability of wind turbine fins to withstand harsh environments.

[0013] Furthermore, the limiting frame includes a ring sleeve, the ring sleeve has a spherical outer edge, the centering rotating member has a spherical inner edge, and the spherical outer edge is in sliding contact with the spherical inner edge.

[0014] Through the above technical scheme, in order to ensure that the limit frame rotates radially in the centering rotating part and ensures that the rotation center is fixed, a specific configuration of the limit frame and the centering rotating part is provided, the ring sleeve is a circular ring arranged vertically on the axis, and the circular ring is formed by cutting a hollow solid with a spherical outer surface and a cylindrical inner part, so that the circumferential outer wall of the ring sleeve is a spherical outer edge with equal radius. At the same time, the centering rotating part is also a circular ring arranged vertically on the axis, and the circular ring is formed by cutting a hollow solid with a cylindrical outer surface and a spherical inner part, and the inner diameter of the spherical inner edge of the centering rotating part is the same as the outer diameter of the spherical outer edge of the ring sleeve. In this way, when the centering rotating part is arranged on the outside of the ring sleeve, the sliding contact between the spherical outer edge and the spherical inner edge can ensure that the ring sleeve is limited by the centering rotating part when it swings radially, thereby realizing the centering swing of the ring sleeve.

[0015] Furthermore, the limit frame also includes a sub-frame, the inner wall of the ring sleeve and the outer wall of the end sleeve are rotatably connected through a bearing, an inner shaft is rotatably installed in the sub-frame, a lining plate and a sub-plate are installed on the circumferential side wall of the inner shaft, and the inner wall of the end sleeve is provided with a sliding groove that cooperates with the lining plate and the sub-plate.

[0016] Through the above technical solution, in order to optimize the structural strength of the root of the fin, the structure of the limit frame is improved, a sub-frame is installed at the end of the ring sleeve located on the inner side of the middle seat, and an inner shaft is installed at the coaxial position of the sub-frame and the fin. The ring sleeve is rotationally limited from the outside of the end sleeve, and the inner shaft is rotationally limited from the inside of the end sleeve. The inside and outside clamps ensure balanced force and prevent the hollow end sleeve from deformation. In addition, the liner and the sub-plate are arranged up and down to increase the position range of the end sleeve where the rotation is limited, disperse the contact positions, and ensure the structural strength of the rotation limit at the root of the fin.

[0017] Furthermore, the middle seat includes a coupling section and an equipment section, and the end sleeve is located on the circumferential outer wall inside the equipment section and is provided with a tooth groove. The rotary drive structure has a gear that cooperates with the tooth groove, and the axis of the gear extends in the height direction and the bottom end is inclined away from the fin, and the lining plate is arranged at the same height as the tooth groove.

[0018] Through the above technical solution, the specific structure of the middle seat and the specific engagement and disengagement actions of the rotary drive structure are disclosed. The coupling section is cylindrical and penetrates from front to back. Structures such as couplings can be installed inside for connection to the rotating shaft of the wind turbine. The equipment section is a cone-shaped section that is narrow in front and wide in the back to reduce wind resistance and wind noise. The equipment section is a hollow structure, which provides an installation position for the internal rotary drive structure and provides space for the swing of the end sleeve. When the tip of the fin swings away from the wind tower, the end of the end sleeve located inside the equipment section swings toward the wind tower. When the end sleeve swings to the extreme position, the rotary drive structure will engage with the tooth grooves on the outer wall of the circumference of the end sleeve through the gear, providing sufficient angle adjustment space for the fin. Similarly, when the end sleeve is reset to the vertical state of the fin, the fin is in a fixed state and rotates to generate electricity. The rotary drive structure will disengage from the end sleeve to protect the rotary drive structure.

[0019] Furthermore, the fin also includes a web, which is equidistantly arranged in the cavity formed by the main body. The attitude adjustment structure includes a hollow through-beam and two carbon fiber strips 2 installed in the through-beam. The through-beam is fixedly connected to all the webs. The through-beam is located at one end outside the fin and passes through the inner shaft. The two carbon fiber strips 2 are fixedly connected to the two ends of the blade tip respectively.

[0020] Through the above technical solution, the internal reinforcement structure of the fin is disclosed. In order to withstand high-intensity scenarios such as strong winds, a reinforcement skeleton is constructed in the hollow main body, including a through beam running through the entire fin and a plurality of webs arranged in the length direction of the through beam. The profile of the web is consistent with the cross-sectional profile of the main body at that location, the connection is tight, and the structural strength is high. In order to control the shape of the fin, two carbon fiber strips 2 are installed through the hollow position of the through beam, one of which is connected to the end of the blade tip located at the leading edge of the fin, and the other is connected to the end of the blade tip located at the trailing edge of the fin. In this way, in extreme cases, the leading edge of the fin faces the direction of the incoming wind, minimizing the windward surface as much as possible and reducing the fin speed. The carbon fiber strip 2 connected to the end of the blade tip located at the leading edge of the fin is tightened, and the carbon fiber strip 2 connected to the end of the blade tip located at the trailing edge of the fin is relaxed. The fin will tilt toward the leading edge of the fin, that is, away from the wind tower, to offset the degree of bending of the fin toward the wind tower due to wind force, and avoid the fin from contacting the wind tower.

[0021] Furthermore, the posture adjustment structure also includes two carbon fiber strips 1, and the carbon fiber strip 1 and the carbon fiber strip 2 are separately installed in the through beam. The two carbon fiber strips 1 are respectively fixedly connected to the two ends of the web located at one-third of the main body, and the carbon fiber strip 1 and the carbon fiber strip 2 are connected to a power source.

[0022] Through the above technical solution, the structure of the posture adjustment structure is optimized. Under severe conditions, in order to reduce the vibration and bending of the fins in strong winds and to maximize the rotation and power generation, the two carbon fiber strips one and the two carbon fiber strips two can be tightened at the same time, and the fins close to the tip and the middle section of the fins are pulled and contracted. Compared with the fins in a completely relaxed state, this pre-tightened state of the fins can reduce the bending angle of the fin tip towards the wind tower caused by the wind, thereby improving the strength and bending resistance of the fins in strong winds, reducing deformation towards the wind tower, ensuring the wind sweeping area of ​​the fins, and performing stable power generation.

[0023] Furthermore, a compensation frame is hingedly mounted on one end of the inner shaft located outside the end sleeve, and the compensation frame is connected to the linear drive structure, and the linear drive structure drives all the inner shafts to translate simultaneously through the compensation frame.

[0024] Through the above technical solution, the compensation frame has support ears, the number of which is consistent with the number of fins, and through the hinge with the inner shaft, the inner shaft can be driven to swing back and forth through the front and rear arranged linear drive structures. When moving backward, the tip of the fin can be kept away from the wind tower, and when the inner shaft swings forward, it can cooperate with the external force of the wind to restore the fin to a vertical state. Only one linear drive structure is set, which can perform synchronous drive, simplify the drive structure, and improve the stability of use.

[0025] Furthermore, the locking structure includes two quarter-circular ring-shaped tooth plates, which are installed at the end of the limit frame. The inner arc position of the tooth plate is provided with a tooth key that cooperates with the tooth groove. The two tooth plates are arranged opposite each other on the diameter extension line of the end sleeve, and the tooth plate can be translated close to the end sleeve to engage with the tooth groove.

[0026] Through the above technical solution, a specific locking structure is disclosed, in which two tooth plates of the locking structure are installed at the end of the limit frame through a driving member, and the driving member drives the tooth plate one to engage with the tooth groove close to the end sleeve to lock the fin, thereby preventing the fin from rotating during work and ensuring the balance of the fin rotation process. When the windward angle of the fin needs to be changed, the driving member drives the tooth plate one to disengage from the tooth groove close to the end sleeve to release the fin, and the two tooth plates are clamped on the left and right, automatically retracted and extended, and the clamping is stable.

[0027] Furthermore, the locking structure includes an arc-shaped tooth plate 2, which is fixedly mounted on the end of the centering rotating member. The tooth plate 2 and the rotary drive structure are arranged opposite each other on the diameter extension line of the end sleeve. When the end sleeve swings radially along the centering rotating member and approaches the rotary drive structure, it disengages from the tooth plate 2.

[0028] Through the above technical solution, another locking structure is disclosed, in which tooth plate 2 is installed directly opposite to the rotary drive structure. Because the rotary drive structure is installed at the extreme position where the end sleeve swings toward the wind tower, that is, when the end sleeve swings close to the rotary drive structure, it will disengage from tooth plate 2, and when the end sleeve swings away from the rotary drive structure, it will engage with tooth plate 2. Moreover, when blown by the wind, the end sleeve tends to swing toward tooth plate 2, so it will be pressed against tooth plate 2. Increasing the contact force can increase the locking firmness.

[0029] Furthermore, the end sleeve is provided with a screw at one end outside the middle seat, and the main body is installed with a hub at one end close to the end sleeve. The hub is provided with a socket corresponding to the screw, and the hub and the screw are fixedly connected by a nut.

[0030] Through the above technical solution, because the end sleeve is a concentrated force structure and is easily damaged, the main body of the fin and the end sleeve are designed separately and connected with exposed bolts, which facilitates the separate replacement of the end sleeve.

[0031] The beneficial effects of the present invention are as follows:

[0032] (1) The present invention optimizes the relay component and installs the relay component at the root of the fin, so that the fin can tilt and swing. The two extreme positions of the swing can correspond to the rotation drive and positioning lock of the fin respectively, ensuring the position stability of the fin during use and protecting the rotation drive structure. The directional swing of the fin can prevent the fin from being excessively bent by the wind and contacting the wind tower, thereby ensuring the structural stability of the wind power equipment in harsh environments.

[0033] (2) The present invention improves the posture adjustment structure and fins. The posture adjustment structure can tighten the flexible fins, reduce the bending angle of the fins during the rotational power generation process, ensure a larger wind sweeping area, and improve the power generation efficiency. In harsh environments, the posture adjustment structure can make the fins bend in a directional manner, and cooperate with the fins' own inclination to keep the fins in a reasonable wind-resistant shape, further improving the environmental adaptability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a first perspective structural diagram of the present invention;

[0035] Figure 2 It is a schematic diagram of the positions of the present invention in different states;

[0036] Figure 3 It is a schematic structural diagram of the interior of the middle shell of the present invention;

[0037] Figure 4 It is a disassembled schematic diagram of the wheel hub, end sleeve, limit frame and inner shaft of the present invention;

[0038] Figure 5 This is a schematic structural diagram of the middle shell and the fins of the present invention in a first state;

[0039] Figure 6 is a schematic structural diagram of the middle shell and the fins of the present invention in the second state;

[0040] Figure 7 It is a schematic diagram of the position of another locking structure of the present invention;

[0041] Figure 8 It is a schematic diagram of the state between another locking structure and the end sleeve of the present invention;

[0042] Figure 9 Schematic cross-sections of the fins of the present invention in different states;

[0043] Figure 10 It is a schematic diagram of the position between the central axis and the posture adjustment structure of the present invention.

[0044] Figure markings: 1. middle seat; 11. coupling section; 12. equipment section; 13. mounting hole; 2. fin; 21. end sleeve; 211. slide groove; 212. tooth groove; 22. hub; 23. leading edge of blade; 24. trailing edge of blade; 25. web; 26. main body; 27. blade tip; 28. screw; 3. linear drive structure; 4. locking structure; 5. centering rotating part; 51. spherical inner edge; 6. rotary drive structure; 7. inner shaft; 71. lining plate; 72. auxiliary plate; 8. limit frame; 81. ring sleeve; 82. spherical outer edge; 83. auxiliary frame; 9. attitude adjustment structure; 91. carbon fiber strip one; 92. carbon fiber strip two; 93. through beam. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] like Figure 1 - Figure 10 As shown, this embodiment provides a wind turbine blade, including a center seat 1, which provides a mounting carrier for fins 2;

[0047] Regarding fin 2, fin 2 is connected to the middle seat 1, refer to Figure 1 、 Figure 2 and Figure 9The fin 2 includes a blade tip 27 and an end sleeve 21. The blade tip 27 adopts a smooth noise reduction shape to reduce the wind noise when the fin 2 rotates to generate electricity. The end sleeve 21 is the root of the fin 2 and is made of metal. It can adapt to the high-intensity use scenario of the root of the fin 2. A main body 26 is provided between the end sleeve 21 and the blade tip 27. The main body 26 adopts a flat strip structure and has two surfaces with different contours to improve lift. The main body 26 has a symmetrically arranged blade leading edge 23 and a blade trailing edge 24. The blade leading edge 23 is used to face the wind first, and the cross section needs to be designed into a teardrop shape to reduce wind noise. The blade trailing edge 24 belongs to the leeward position. The wind noise and vibration are reduced by designing it to be thinner, and the blade leading edge 23 and the blade trailing edge 24 need to be locally strengthened in structure. After the blade leading edge 23 is strengthened, it can resist the impact of flying objects, and the blade trailing edge 24 can resist the vibration impact caused by the flow velocity difference of the airflow.

[0048] Regarding the relay, the relay is used to connect the middle seat 1 and the end sleeve 21. The relay enables the fin 2 to achieve radial swing while rotating. For details, refer to Figure 3 and Figure 4 The relay comprises a centering rotating member 5 and a limiting frame 8, wherein the centering rotating member 5 passes through the mounting hole 13 fixedly installed at the middle seat 1 corresponding to the fin 2, and the centering rotating member 5 is fixed on the middle seat 1, and the limiting frame 8 can swing radially in the centering rotating member 5 and the rotation center remains fixed, and the end sleeve 21 is coaxially rotatably connected with the limiting frame 8. In this way, the end sleeve 21 can rotate under the limit of the limiting frame 8, and can also swing radially under the limit of the centering rotating member 5. In order to make the blade tip 27 of the fin 2 swing away from the wind tower to prevent the fin 2 from bending toward the wind tower when affected by the wind, a linear drive structure 3 is required to limit the swing direction of the limiting frame 8, and the linear drive structure 3 is installed at the axial position of the middle seat 1, that is, the swing of the limiting frame 8 can make the vertical fin 2 tilt in the direction away from the wind tower, and the rotation of the relay can ensure that the fin 2 tilts away from the wind tower;

[0049] Regarding the posture adjustment structure 9, refer to Figure 9 The posture adjustment structure 9 is located inside the fin 2. The posture adjustment structure 9 can be twitched. When it moves, it can change the shape of the fin 2. Specifically, when in extreme conditions, the leading edge 23 of the fin 2 faces the incoming wind direction. At this time, the wind tower is located at the trailing edge 24 of the fin 2. Through the movement of the posture adjustment structure 9, the posture adjustment structure 9 can make the blade tip 27 bend and tilt toward the leading edge 23 of the blade, thereby preventing the fin 2 from bending and contacting the wind tower, thereby improving the stability of the fin 2.

[0050] Regarding the linear drive structure 3 and the rotary drive structure 6, the linear drive structure 3 can drive the limit frame 8 to swing radially in the centering rotating member 5, and the swing is limited to forward and backward swinging, and the limit frame 8 will not rotate horizontally in the centering rotating member 5, ensuring that the angle of the fin 2 can be fixed at a specific angle after adjustment. In addition, the rotary drive structure 6 can drive the fin 2 to rotate in the limit frame 8 through the end sleeve 21 when the fin 2 tilts away from the wind turbine tower, thereby realizing the self-rotation of the fin 2, adjusting the windward angle of the fin 2, and then controlling the rotation speed of the wind turbine fin 2;

[0051] Regarding the locking structure 4, the locking structure 4 is located inside the middle seat 1, refer to Figure 3 and Figure 8 The locking structure 4 is installed opposite to the end sleeve 21. The locking structure 4 is separated from the end sleeve 21 when the fin 2 is tilted, so that the fin 2 can be smoothly rotated to adjust the tilt angle. The locking structure 4 is locked with the end sleeve 21 when the fin 2 is vertical, ensuring the stability of the adjusted position of the fin 2, preventing multiple fins 2 from being forced to rotate due to wind force, thereby avoiding rotation imbalance caused by different tilt angles of the fin 2, and reducing insufficient rotation speed or even structural damage caused by the imbalance of the fin 2's own rotation.

[0052] In a further embodiment, in order to ensure that the limit frame 8 rotates radially in the centering rotating member 5 and the rotation center is fixed, a specific configuration of the limit frame 8 and the centering rotating member 5 is provided, referring to Figure 4 and Figure 5 The limiting frame 8 includes a ring sleeve 81, which is a circular ring arranged vertically along the axis. The ring is cut from a hollow entity with a spherical outer surface and a cylindrical inner surface, so that the circumferential outer wall of the ring sleeve 81 is a spherical outer edge 82 with equal radius. At the same time, the centering rotating member 5 is also a ring arranged vertically along the axis. The ring is cut from a hollow entity with a cylindrical outer surface and a spherical inner surface, so that the centering rotating member 5 has a spherical inner edge 51. When installed, the centering rotating member 5 is sleeved on the outside of the ring sleeve 81, and the spherical outer edge 82 is in sliding contact with the spherical inner edge 51. Moreover, the inner diameter of the spherical inner edge 51 of the centering rotating member 5 is the same as the outer diameter of the spherical outer edge 82 of the ring sleeve 81. In this way, the sliding contact between the spherical outer edge 82 and the spherical inner edge 51 can ensure that the ring sleeve 81 is limited by the centering rotating member 5 when it swings radially, thereby realizing the centering swing of the ring sleeve 81.

[0053] In a further embodiment, in order to optimize the structural strength of the root of the fin 2, the structure of the limit frame 8 is improved, referring to Figure 4 and Figure 10, a sub-frame 83 is installed at one end of the ring sleeve 81 located on the inner side of the middle seat 1, and the inner wall of the ring sleeve 81 is rotatably connected to the outer wall of the end sleeve 21 through a bearing, and the rotation is limited from the outside of the end sleeve 21. An inner shaft 7 is installed at the coaxial position of the sub-frame 83 and the fin 2, and the sub-frame 83 is rotatably connected to the inner shaft 7. A liner 71 and a sub-plate 72 are installed on the circumferential side wall of the inner shaft 7. A slide groove 211 is provided on the inner wall of the end sleeve 21 to cooperate with the liner 71 and the sub-plate 72. The inner shaft 7 is rotationally limited from the inside of the end sleeve 21, and the inside and outside clamping ensures balanced force to prevent the hollow end sleeve 21 from being deformed by only the inside and outside forces. And, refer to Figure 10 The liner 71 and the sub-plate 72 are arranged up and down to increase the position range of the end sleeve 21 where the end sleeve 21 is rotationally limited, that is, the contact position of the rotation limit is dispersed along the axial direction of the end sleeve 21, with at least three annular concentrated force intervals to ensure the structural strength of the rotation limit at the root of the fin 2. It should be emphasized that ball bearings can be installed at the ends of the liner 71 and the sub-plate 72 to make rolling contact with the inside of the end sleeve 21 to reduce friction loss. Anti-wear structures can also be provided at the ends of the liner 71, the sub-plate 72 and the inner wall of the end sleeve 21, such as copper graphite self-lubricating bushings, or other high-hardness wear-resistant layers, which are simpler than ball bearing structures and have longer subsequent maintenance cycles.

[0054] In a further embodiment, the specific structure of the middle seat 1 and the specific engagement and separation actions of the rotary drive structure 6 are disclosed, referring to Figure 3 The middle seat 1 includes a coupling section 11 and a device section 12. The coupling section 11 is cylindrical and runs through the front and back. A coupling and other structures can be installed inside to connect with the shaft of the wind turbine. The device section 12 is a cone-shaped structure that is narrow in front and wide in the back to reduce wind resistance and wind noise. The device section 12 is a hollow structure that provides a mounting position for the internal rotary drive structure 6 and provides space for the swing of the end sleeve 21. Figure 3 and Figure 4The end sleeve 21 is located on the outer circumferential wall of the equipment section 12 and is provided with a tooth groove 212. The rotary drive structure 6 has a gear that cooperates with the tooth groove 212. The axis of the gear extends in the height direction and the bottom end is inclined away from the fin 2. When the blade tip 27 of the fin 2 swings in the direction away from the wind tower, the end of the end sleeve 21 located inside the equipment section 12 swings toward the wind tower. When the end sleeve 21 swings to the extreme position, the rotary drive structure 6 will engage with the tooth groove 212 on the outer circumferential wall of the end sleeve 21 through the gear, providing sufficient angle adjustment space for the fin 2. The lining plate 71 is arranged at the same height as the tooth groove 212. When the fin 2 is adjusted in angle, the lining plate 71 can support the meshing position of the tooth groove 212 and the rotary drive structure 6 for supplementary support. The support prevents the end sleeve 21 from deforming and causing the tooth groove 212 to be unable to engage smoothly with the rotation drive structure 6. Similarly, when the end sleeve 21 is reset to the vertical state of the fin 2, the fin 2 is in a fixed state and rotates to generate electricity, and the rotation drive structure 6 will be disengaged from the end sleeve 21 to protect the rotation drive structure 6. Because the rotation drive structure 6 uses a reduction motor as a power source, when generating electricity in a strong wind, if the tilted fin 2 fails to lock due to the torsional force, it will instantly rotate rapidly until the fin 2 is parallel to the direction of the wind. This sudden rotation, if the reduction motor is always engaged with the fin 2, the high-speed flipping of the reduction motor may cause damage to the internal reduction gearbox or the motor as a whole, resulting in unnecessary secondary losses.

[0055] In a further embodiment, the internal reinforcement structure of the fin 2 is disclosed. In order to resist high-intensity scenes such as strong winds, a reinforcement skeleton is constructed in the hollow main body 26 of the fin 2. The attitude adjustment structure 9 includes a hollow through-beam 93 and two carbon fiber strips 92 installed in the through-beam 93. The webs 25 are equidistantly arranged in the cavity formed by the main body 26. The through-beam 93 is fixedly connected to all the webs 25 to form a fishbone-shaped reinforcement skeleton. Moreover, the profile of the web 25 is consistent with the cross-sectional profile of the main body 26 at that location, the connection is tight, and the structural strength is high. At the same time, the two carbon fiber strips 92 are installed through the hollow position of the through-beam 93 and can be flexibly pulled. One of the carbon fiber strips 92 is connected to the blade tip 27 at one end of the leading edge 23 of the blade, and the other carbon fiber strip 92 is connected to the blade tip 27 at the trailing edge of the blade. 24 is connected, and a through beam 93 is located at one end of the outer side of the fin 2 and passes through the inner shaft 7 to guide the carbon fiber strip 2 92 and prevent the carbon fiber strip 2 92 from wearing the inner shaft 7. The free end of the carbon fiber strip 2 92 can also be extended to the outside of the fin 2 to connect to a power source to pull the carbon fiber strip 2 92. In this way, in extreme cases, the fin 2 rotates linearly so that the leading edge 23 of the blade faces the incoming wind direction, reducing the windward surface as much as possible, reducing the rotation speed of the fin 2, and the carbon fiber strip 2 92 connected to the tip 27 at one end of the leading edge 23 of the blade is tightened, and the carbon fiber strip 2 92 connected to the tip 27 at one end of the trailing edge 24 of the blade is relaxed. The fin 2 will tilt toward the leading edge 23 of the blade, that is, away from the wind tower, to offset the degree of bending of the fin 2 toward the wind tower due to the wind force, and avoid the fin 2 from contacting the wind tower.

[0056] In a further embodiment, the structure of the posture adjustment structure 9 is optimized, referring to Figure 9In severe conditions, in order to reduce the vibration and bending of the fin 2 in strong winds and to maximize the rotation and power generation, the fin 2 needs to be converged to reduce the degree of freedom of the fin 2. The attitude adjustment structure 9 also includes two carbon fiber strips 91. The carbon fiber strip 91 and the carbon fiber strip 2 92 are separately installed in the through beam 93. The two carbon fiber strips 91 are respectively fixedly connected to the two ends of the web 25 located at one-third of the main body 26. The two carbon fiber strips 91 and the two carbon fiber strips 92 can be tightened at the same time to pull and contract the fin 2 near the tip 27 and the middle section of the fin 2. This pre-tightened state of the fin 2 is compared to the completely relaxed state. The lower fin 2 can reduce the bending angle of the blade tip 27 of the fin 2 toward the wind tower caused by the wind, improve the strength and bending resistance of the fin 2 under strong wind conditions, reduce deformation toward the wind tower, ensure the wind sweeping area of ​​the fin 2, and perform stable power generation. Specifically, the carbon fiber strip 1 91 and the carbon fiber strip 2 92 are connected to a power source, which can be an electric winder. The free ends of the carbon fiber strip 1 91 and the carbon fiber strip 2 92 are wound on the rotating shaft of the electric winder, and the carbon fiber strip 1 91 and the carbon fiber strip 2 92 can be tightened and loosened by forward and reverse rotation. Other electric equipment can also be used instead of the electric winder. The specific selection can be based on demand.

[0057] In a further embodiment, in order to ensure the synchronous control of all fins 2, refer to Figure 3 and Figure 6 The inner shaft 7 is located at one end of the outer side of the end sleeve 21 and is hingedly installed with a compensation frame. The compensation frame is arranged vertically, and there are ears at the edge of the compensation frame. The number of ears is consistent with the number of fins 2. The compensation frame is connected to the linear drive structure 3 and is driven to move back and forth. The linear drive structure 3 drives all the inner shafts 7 to move simultaneously through the compensation frame. Specifically, through the hinge connection with the inner shaft 7, the linear drive structure 3 arranged front and back can drive the inner shaft 7 to swing back and forth. When moving backward, the blade tip 27 of the fin 2 can be kept away from the wind tower. When the inner shaft 7 swings forward, it can cooperate with the external force of the wind to restore the fin 2 to a vertical state. Only one linear drive structure 3 is set. , can be driven synchronously, the driving structure is simplified, and the stability of use is improved. It should be noted that because the compensation frame moves horizontally back and forth, and the inner shaft 7 swings around the axis, there will be a change in position in height, so the connection position between the compensation frame and the inner shaft 7 needs to be optimized, such as setting a flexible structure such as a rubber sleeve to compensate for the height change of the inner shaft 7 to avoid the equipment from failing to operate. At the same time, the rubber sleeve can also be replaced by a vertical rectangular groove on the support ear of the compensation frame to connect with the inner shaft 7, so that the inner shaft 7 can slide vertically relative to the compensation frame, which can also ensure the normal operation of the equipment. The specific structure can be selected according to the process and processing environment.

[0058] In a further embodiment, a specific locking structure 4 is disclosed, referring to Figure 3 、 Figure 5 and Figure 6 The locking structure 4 includes two quarter-circular ring-shaped tooth plates 1, which are installed at the end of the limit frame 8. The two tooth plates 1 of the locking structure 4 are coaxially arranged with the limit frame 8 and swing synchronously with the limit frame 8 to ensure that the tooth plate 1 is always facing the end sleeve 21. At the same time, the inner arc position of the tooth plate 1 is provided with a tooth key that cooperates with the tooth groove 212. The two tooth plates 1 are arranged opposite to each other on the diameter extension line of the end sleeve 21. When in use, the driving member drives the tooth plate 1 to approach the end sleeve 21 and engage with the tooth groove 212 to lock the fin 2, preventing the fin 2 from rotating during work and ensuring the balance of the fin 2 during rotation. When the windward angle of the fin 2 needs to be changed, the driving member drives the tooth plate 1 to approach the end sleeve 21 and disengage from the tooth groove 212 to release the fin 2. The two tooth plates 1 are clamped left and right, automatically retracted and extended, and the clamping is stable. The driving member can use a hydraulic cylinder or other linear driving member to be selected according to the specific usage scenario.

[0059] In a further embodiment, another locking structure 4 is disclosed, referring to Figure 7 and Figure 8 The locking structure 4 includes an arc-shaped tooth plate 2, the center of the tooth plate 2 is coaxial with the center of the centering rotating member 5, and the tooth plate 2 is fixedly mounted on the end of the centering rotating member 5. The fixed installation method does not require a separate drive member to be designed for the locking structure 4. The structure is simple and not easily damaged in subsequent use, which reduces the difficulty of maintenance. The tooth plate 2 and the rotary drive structure 6 are arranged opposite to each other on the diameter extension line of the end sleeve 21. The tooth plate 2 is installed opposite the rotary drive structure 6 because the rotary drive structure 6 is installed at the extreme position where the end sleeve 21 swings toward the wind tower. That is, when the end sleeve 21 swings close to the rotary drive structure 6, it will disengage from the tooth plate 2, and when the end sleeve 21 swings away from the rotary drive structure 6, it will engage with the tooth plate 2. Moreover, when blown by the wind, the end sleeve 21 tends to swing toward the tooth plate 2, so it will be pressed against the tooth plate 2. Increasing the contact force can increase the degree of locking firmness. The lining plate 71 is at the same height as the tooth groove 212, and the lining plate 71 is opposite to the position of the tooth plate 2, which can support the end sleeve 21 from the inside to prevent deformation caused by concentrated pressure in a smaller range of the end sleeve 21.

[0060] In a further embodiment, a specific configuration of the root of the fin 2 is provided, referring to Figure 4 and Figure 10Because the end sleeve 21 is a concentrated force structure and is easily damaged, the main body 26 of the fin 2 is designed to be separated from the end sleeve 21. The end sleeve 21 is located on the outside of the middle seat 1 and is provided with a screw 28. The screw 28 is arranged in a circular array on the circumference of the end sleeve 21. A hub 22 is installed at one end of the main body 26 close to the end sleeve 21. The hub 22 is provided with a socket corresponding to the screw 28. When assembled, the screw 28 is inserted into the socket, and then the hub 22 and the screw 28 are fixedly connected by a nut, and the nut is exposed to the air. Compared with the existing connection method in which the root bolts of the fin 2 are located inside the middle seat 1, workers can use a hanging basket to directly approach the bolt connection position for disassembly and assembly operations, which is more convenient for assembly and maintenance, and it is also more convenient to replace the end sleeve 21 separately.

[0061] The working principle of this embodiment is as follows:

[0062] During installation, multiple fins 2 are arranged in a circular array on a vertical plane, and the extended midlines of all fins 2 have a common intersection. The middle seat 1 serves as a base and is installed at the intersection of the extended midlines of the multiple fins 2. The rotation center of the middle seat 1 passes through the intersection of the extended midlines of the fins 2. The middle seat 1 is arranged horizontally front and back, and the rear end is connected to the rotating shaft of the wind tower, so that when the fins 2 are blown by the wind, the wind turbine can be driven to rotate by the middle seat 1 to generate electricity. Since the root of the fin 2 is subjected to concentrated force, the main body 26 of the fin 2 and the end sleeve 21 are designed separately and connected with exposed bolts, which facilitates the separate replacement of the end sleeve 21.

[0063] When used under normal air volume, the angle of fin 2 can be adjusted. Figure 2 , to increase the swept wind area and power generation of the fin 2 as much as possible, before adjusting the angle, tilt the fin 2 forward in the direction away from the wind tower and contact with the rotary drive structure 6. The rotary drive structure 6 adopts a combination of a reduction motor and a gear, which can drive the fin 2 to rotate by engaging with the end sleeve 21, and the adjustment method of the fin 2 tilting away from the wind tower leaves sufficient space for the rotation adjustment angle of the fin 2. After adjusting the angle, the fin 2 is reset to a vertical state. At this time, the rotary drive structure 6 and the fin 2 are disengaged from each other and locked by a separately provided locking structure 4 to prevent damage to the reduction motor of the rotary drive structure 6 when the locking structure 4 fails and the fin 2 rotates instantly;

[0064] When used in strong winds, refer to Figure 9Because the main body 26 of the fin 2 is made of flexible material, it will tilt toward the wind tower when blown by strong winds. In order to take into account both rotational power generation and equipment protection, the two carbon fiber strips 1 91 and the two carbon fiber strips 2 92 of the attitude adjustment structure 9 can be tightened at the same time, so that the fin 2 close to the blade tip 27 and the middle section of the fin 2 are pulled and tightened. This pre-tightened state of the fin 2 can reduce the vibration of the fin 2 in strong winds. Compared with the fin 2 in a completely relaxed state, it can also reduce the bending angle of the blade tip 27 of the fin 2 toward the wind tower when blown by the wind, thereby improving the strength and bending resistance of the fin 2 in strong winds and ensuring the swept area of ​​the fin 2.

[0065] In extreme cases, refer to Figure 9 The fin 2 is tilted and the angle is adjusted so that the leading edge 23 of the fin 2 faces the wind, the frontal area is minimized, and the rotation speed of the fin 2 is reduced. The attitude adjustment structure 9 starts working at the same time, and the carbon fiber strip 2 92 connected to the tip 27 at one end of the blade leading edge 23 is tightened, and the carbon fiber strip 2 92 connected to the tip 27 at one end of the blade trailing edge 24 is relaxed. The fin 2 will tilt toward the leading edge 23 of the blade, that is, in the direction away from the wind tower, further offsetting the bending deformation of the fin 2 toward the wind tower due to the wind force, and resisting the bending trend of the tip 27 of the fin 2 toward the wind tower in strong winds, which can improve the ability of the wind turbine blade to resist harsh environments.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A wind turbine blade, comprising a center seat (1), characterized in that: Also includes: a fin (2) connected to the center seat (1), the fin (2) comprising a blade tip (27) and an end sleeve (21), a main body (26) being provided between the end sleeve (21) and the blade tip (27), the main body (26) having a blade leading edge (23) and a blade trailing edge (24) symmetrically arranged; A relay member for connecting the middle seat (1) and the end sleeve (21), the relay member comprising a centering rotating member (5) and a limiting frame (8), the centering rotating member (5) passing through a mounting hole (13) fixedly mounted at the middle seat (1) corresponding to the fin (2), the limiting frame (8) comprising an annular sleeve (81), the annular sleeve (81) having a spherical outer edge (82), the centering rotating member (5) having a spherical inner edge (51), the spherical outer edge (82) being in sliding contact with the spherical inner edge (51), the limiting frame (8) being able to swing radially in the centering rotating member (5) with the rotation center being kept fixed, the end sleeve (21) being coaxially rotatably connected to the limiting frame (8), and the swinging of the limiting frame (8) being able to tilt the vertical fin (2) in a direction away from the wind tower; An attitude adjustment structure (9) is located inside the fin (2), the attitude adjustment structure (9) comprising a hollow through-beam (93), two carbon fiber strips (91), and two carbon fiber strips (92) installed in the through-beam (93), the two carbon fiber strips (92) being fixedly connected to the two ends of the blade tip (27), and the two carbon fiber strips (91) being fixedly connected to the two ends of the web (25) located at one-third of the main body (26), respectively. The attitude adjustment structure (9) can cause the blade tip (27) to bend and tilt toward the leading edge (23) of the blade; A linear drive structure (3) and a rotary drive structure (6) are located inside the center seat (1), wherein the linear drive structure (3) can drive the limit frame (8) to swing radially inside the centering rotating member (5), and the rotary drive structure (6) can drive the fin (2) to rotate in the limit frame (8) through the end sleeve (21) when the fin (2) tilts in a direction away from the wind turbine tower; A locking structure (4) is located inside the middle seat (1), the locking structure (4) is installed opposite the end sleeve (21), the locking structure (4) is separated from the end sleeve (21) when the fin (2) is tilted, and the locking structure (4) is locked with the end sleeve (21) when the fin (2) is vertical; The limit frame (8) further includes a sub-frame (83), the inner wall of the annular sleeve (81) and the outer wall of the end sleeve (21) are rotatably connected via a bearing, an inner shaft (7) is rotatably mounted through the sub-frame (83), a liner (71) and a sub-plate (72) are mounted on the circumferential side wall of the inner shaft (7), and a slide groove (211) is provided on the inner wall of the end sleeve (21) to cooperate with the liner (71) and the sub-plate (72); The middle seat (1) includes a coupling section (11) and an equipment section (12); the end sleeve (21) is located on a circumferential outer wall inside the equipment section (12) and is provided with a tooth groove (212); the rotary drive structure (6) is provided with a gear that cooperates with the tooth groove (212); the axis of the gear extends in the height direction and the bottom end is inclined in a direction away from the fin (2); the lining plate (71) is arranged at the same height as the tooth groove (212) and is directly opposite to it.

2. The wind turbine blade according to claim 1, characterized in that: The fin (2) further comprises webs (25), the webs (25) being equidistantly arranged in the cavity formed by the main body (26), the through beam (93) being fixedly connected to all the webs (25), and the through beam (93) being located at one end outside the fin (2) and passing through the inner shaft (7).

3. The wind turbine blade according to claim 2, characterized in that: The carbon fiber strip one (91) and the carbon fiber strip two (92) are individually installed through the through beam (93), and the carbon fiber strip one (91) and the carbon fiber strip two (92) are connected to a power source.

4. The wind turbine blade according to claim 1, characterized in that: The inner shaft (7) is located on one end outside the end sleeve (21) and is hingedly mounted with a compensation frame, the compensation frame is connected to the linear drive structure (3), and the linear drive structure (3) drives all the inner shafts (7) to translate simultaneously through the compensation frame.

5. The wind turbine blade according to claim 1, characterized in that: The locking structure (4) comprises two quarter-circular ring-shaped tooth plates, the tooth plates being mounted on the end of the limit frame (8), the tooth keys being provided at the inner arc position of the tooth plates for cooperating with the tooth grooves (212), the two tooth plates being arranged opposite each other on the diameter extension line of the end sleeve (21), and the tooth plates being able to translate close to the end sleeve (21) and engage with the tooth grooves (212).

6. The wind turbine blade according to claim 1, characterized in that: The locking structure (4) includes an arc-shaped tooth plate 2, which is fixedly mounted on the end of the centering rotating member (5). The tooth plate 2 and the rotary drive structure (6) are arranged opposite each other on the diameter extension line of the end sleeve (21). When the end sleeve (21) swings radially along the centering rotating member (5) and approaches the rotary drive structure (6), it disengages from the tooth plate 2.

7. The wind turbine blade according to claim 1, characterized in that: The end sleeve (21) is located at one end outside the middle seat (1) and is provided with a screw (28). The main body (26) is provided with a hub (22) at one end close to the end sleeve (21). The hub (22) is provided with a socket corresponding to the screw (28). The hub (22) and the screw (28) are fixedly connected by a nut.

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