Blade structure and wind driven generator with same

Abstract

The utility model relates to a blade structure of a wind driven generator. The blade structure comprises a blade, a blade tip, a blade root, a flap and more than two driving devices, the blade root and the blade tip are arranged at the two ends of the blade correspondingly, and the blade is gradually widened from the blade root to the blade tip. The more than two driving devices are arranged on the blade and are distributed at equal intervals in the body length direction of the blade, and the output ends of the more than two driving devices penetrate through the rear edge of the blade to be fixedly connected with the flap and are suitable for controlling the flap to be unfolded or folded; a bent wing is arranged at the top end of the blade tip; by arranging the flaps on the blades and controlling the flaps to be unfolded or folded through the driving device, the wind driven generator can keep a high wind energy utilization rate under different wind speed conditions, the energy output efficiency of the whole wind power generation system is improved, the design that the top ends of the blade tips are provided with the bent wings effectively reduces generation of blade tip vortexes, and the wind power generation efficiency is improved. And the air flow becomes relatively stable, so that the noise generated by the unstable air flow is reduced.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a blade structure and a wind turbine having the same. Background Technology

[0002] As the global energy structure shifts towards cleaner and lower-carbon energy, wind power, as an important component of renewable energy, has received widespread attention and rapid development. However, existing blades cannot meet the needs of large-scale turbine upgrades. The blade structure of existing wind turbines is fixed after manufacturing. In actual operation, this fixed blade structure cannot change its width according to wind speed changes under low wind speed conditions due to its design limitations. Consequently, wind energy is not fully converted into mechanical energy, which not only limits the power generation capacity of wind turbines under low wind speed conditions but also reduces the energy output efficiency of the entire wind power system. Summary of the Invention

[0003] In view of this, this application proposes a blade structure for a wind turbine, including: a blade, a blade tip, a blade root, a flap, and two or more drive devices.

[0004] The leaf base and leaf tip are located at both ends of the leaf blade, and the leaf blade gradually widens from the leaf base to the leaf tip.

[0005] Two or more drive devices are installed inside the blade cavity and are equidistantly distributed along the length of the blade. The output ends of the two or more drive devices pass through the trailing edge of the blade and are fixedly connected to the flap, which is suitable for controlling the opening or closing of the flap.

[0006] The tip of the leaf has a bent wing.

[0007] In one possible implementation, the two or more drive devices each include: a bull horn-shaped housing, a motor, a transmission component, and a sliding component;

[0008] The horn-shaped outer shell is fixedly installed inside the cavity of the blade. The motor is arranged adjacent to the horn-shaped outer shell. The sliding member is slidably connected to the horn-shaped outer shell, and one end of the sliding member is fixedly connected to the flap. The other end of the sliding member is connected to the output end of the motor through a transmission member.

[0009] In one possible implementation, the transmission component is a rack; one end of the rack is fixedly connected to a sliding element, and the end of the rack away from the sliding element is engaged with the output end of the motor.

[0010] In one possible implementation, the transmission component is a lead screw; one end of the lead screw is threadedly connected to a sliding component, and the end of the lead screw away from the sliding component is fixedly connected to the output end of the motor.

[0011] In one possible implementation, a fixed support is provided inside the bull horn shell; the fixed support is sleeved on the lead screw and located between the motor and the sliding component.

[0012] In one possible implementation, a preset angle is provided between the length direction of the blade tip and the length direction of the folding wing.

[0013] In one possible implementation, the preset angle ranges from 30° to 50°.

[0014] In one possible implementation, the blade's main body is a curved airfoil structure.

[0015] According to another aspect of this application, a wind turbine is provided, comprising: the blade structure of any of the above, a drive hub, a generator, and a tower; the generator is fixedly mounted on the tower, and the drive hub is drivenly connected to the rotor of the generator; the blade structure has two or more blades, and the two or more blade structures are evenly arranged along the circumference of the drive hub.

[0016] Beneficial effects

[0017] This application incorporates flaps on the blades and controls their deployment and closure via a drive mechanism. At low wind speeds, the drive mechanism deploys the flaps, increasing the blade width and wind-receiving area, thereby increasing the threshold wind speed for the blade structure. This allows the blade structure to achieve sufficient torque and power output even at lower wind speeds, improving wind energy capture and thus enhancing power generation efficiency. Conversely, at high wind speeds, the drive mechanism closes the flaps, ensuring they are flush against the blade's frontal windward surface. This reduces the blade width and wind-receiving area, increasing the threshold wind speed for the blade structure. This allows the blade structure to continue operating at higher wind speeds, preventing damage to the wind turbine due to overload and ensuring stable operation. This dynamic adjustment capability enables the wind turbine to maintain high wind energy utilization under varying wind speeds, improving the overall energy output efficiency of the wind power generation system.

[0018] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0020] Figure 1 This diagram shows the main structural features of the blade in this application.

[0021] Figure 2 A schematic diagram of the main structure of the blade of this application is shown;

[0022] Figure 3 A schematic diagram of the main structure of the blade tip of this application is shown;

[0023] Figure 4 A schematic diagram of the main structure of the flap in this application is shown;

[0024] Figure 5 This diagram shows a schematic of the rack and pinion drive used in the drive device of this application.

[0025] Figure 6 This diagram shows a schematic of the drive device using a lead screw drive in this application.

[0026] Figure 7 This paper shows a schematic diagram of the structure of the slider in this application;

[0027] Figure 8 This diagram shows the structural schematic of the fixed support of this application;

[0028] Figure 9 A cross-sectional view of the blade structure is shown;

[0029] Figure 10 This diagram shows the structure when the flaps are deployed.

[0030] Figure 11 This diagram shows the structure when the flaps are deployed.

[0031] Figure 12 A schematic diagram showing the structure with a noise-reducing part on the blade structure is shown.

[0032] Figure 13 A schematic diagram of the structure of a wind turbine is shown. Detailed Implementation

[0033] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0034] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0037] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0038] This application proposes a blade structure 100 for a wind turbine generator 520, such as... Figures 1 to 12 As shown, it includes: a blade 110, a blade tip 120, a blade root 130, a flap 140, and two or more drive devices 200; the blade root 130 and the blade tip 120 are respectively disposed at both ends of the blade 110, and the blade 110 gradually widens from the blade root 130 to the blade tip 120; the two or more drive devices 200 are all disposed in the cavity of the blade 110 and are equidistantly distributed along the length of the blade 110, and the output ends of the two or more drive devices 200 all penetrate through the trailing edge of the blade 110 and are fixedly connected to the flap 140, which is suitable for controlling the opening or closing of the flap 140; the tip of the blade tip 120 is provided with a bending wing 121.

[0039] It should be noted that the blade 110 generates lift and drag under wind force, thereby converting the captured wind energy into mechanical energy to rotate the generator 520. The design of the blade 110 gradually widening from the root 130 to the tip 120 allows the blade 110 to better adapt to different wind speeds. The wider tip 120 increases the swept area, improving the wind energy capture efficiency and thus enhancing the overall power generation efficiency. The root 130 is used to securely connect the blade 110 to the hub of the wind turbine 520. When the airflow passes over the bent blade 121, the design of the bent blade 121 at the tip 120 effectively reduces the generation of vortices at the tip 120, making the airflow relatively stable and thus reducing noise caused by airflow instability. The flap 140 is used to adjust the width of the blade 110. The main body of the flap 140 is a curved plate structure, and the flap 140 matches the outer contour of the frontal windward surface 101 of the blade 110. (Where, as...) Figure 9As shown, the frontal windward surface 101 of the blade 110, i.e., the surface on which the blade 110 rotates, is generally perpendicular to the prevailing wind direction; the back windward surface 102, i.e., the surface on which the blade 110 cuts the air when it rotates, is the flap 140, which is set along the length of the blade 110. Figure 1 As shown, when the flap 140 is closed, the flap 140 is in close contact with the frontal windward surface 101 of the blade 110. By opening or closing, the overall width of the blade 110 is changed, so that the blade 110 can be adjusted to a suitable size under different wind conditions, thereby better interacting with the airflow. The drive device 200 provides power for the opening and closing of the flap 140. Two or more drive devices 200 operate synchronously and control the opening and closing of the flap 140 at the same time, reducing the mechanical stress and vibration caused by inconsistent flap 140 movements, thereby improving the stability and reliability of the entire blade structure 100.

[0040] This application provides a flap 140 on the blade 110 and controls the opening or closing of the flap 140 via a drive device 200, such as... Figure 10 , Figure 11 As shown, at low wind speeds, the drive unit 200 controls the flaps 140 to deploy, thereby increasing the width and wind-receiving area of ​​the blades 110. This increases the threshold wind speed at which the blade structure 100 cuts in, allowing the blade structure 100 to achieve sufficient torque and power output even at lower wind speeds, improving wind energy capture and thus enhancing power generation efficiency. Figure 1 As shown, when the wind speed is too high, the drive device 200 controls the flap 140 to close so that the flap 140 is in close contact with the front windward surface 101 of the blade 110, reducing the width and wind-receiving area of ​​the blade 110, thereby increasing the cut-out wind speed threshold of the blade structure 100, enabling the blade structure 100 to continue operating at higher wind speeds, avoiding damage to the wind turbine due to overload operation, and ensuring the stable operation of the wind turbine. This dynamic adjustment capability enables the wind turbine to maintain a high wind energy utilization rate under different wind speed conditions, improving the energy output efficiency of the entire wind power generation system.

[0041] Furthermore, the width of the blade structure 100 ranges from 4m to 5m, while the width of existing blade structures is typically set at 3.7 meters. Compared to existing blade structures, the wider design of the blade structure 100 in this application increases the contact area between the blade structure 100 and the airflow, thereby capturing more wind energy and improving wind energy utilization. The wider blade structure 100 also allows the airflow to flow more smoothly, reducing airflow eddies and noise. At the same time, while maintaining the same wind energy conversion rate, the blade structure 100 in this application shortens its length by increasing its width, thus reducing the transportation difficulty and cost of the blade structure 100.

[0042] Furthermore, the main body of the blade 110 has a hollow structure, the drive device 200 is installed in the cavity of the blade 110, and the output end of the drive device 200 passes through the trailing edge of the blade 110 and is fixedly connected to the flap 140.

[0043] Preferably, blade 110 adopts Carbon fiber or other lightweight, high-strength materials with a certain degree of flexibility Made of materials.

[0044] In one possible implementation, the length ratio of blade 110 to flap 140 is approximately 1:0.7; the width ratio of blade 110 to flap 140 is 3:1.

[0045] Furthermore, the width of the flap 140 is less than one-third the width of the blade 110.

[0046] In one possible implementation, the flap 140 is made of stainless steel or other lightweight, high-strength materials or other materials that meet the requirements of the blade.

[0047] In one possible implementation, such as Figure 5 , Figure 6 As shown, each of the two or more drive devices 200 includes: a horn-shaped outer shell 210, a motor 220, a transmission component, and a sliding component 300; the horn-shaped outer shell 210 is installed in the cavity of the blade 110, the motor 220 is arranged adjacent to the horn-shaped outer shell 210, the sliding component 300 is slidably connected to the horn-shaped outer shell, and one end of the sliding component 300 is fixedly connected to the flap 140, and the other end of the sliding component 300 is connected to the output end of the motor 220 through the transmission component.

[0048] It should be noted that the motor 220 is used to provide power for the opening or closing of the flap 140, and the transmission component is used to transmit the power output from the motor 220 to the slider 300. The slider 300 is used to convert the rotational motion transmitted from the motor 220 through the transmission component into linear motion, thereby driving the flap 140 to open and close. Specifically, the horn-shaped outer shell 210 has an opening on the side facing the blade 110, and slide rails are symmetrically arranged on both sides of the opening of the horn-shaped outer shell 210, and the length directions of the two slide rails are parallel to each other. Correspondingly, the slider 300 has sliding grooves 310 on both sides that match the slide rails. The slider 300 and the slide rails cooperate with each other through the sliding grooves 310, thereby realizing the sliding connection between the slider 300 and the horn-shaped outer shell 210.

[0049] Furthermore, motor 220 uses a stepper motor or other matching motors from the prior art.

[0050] In one possible implementation, such as Figure 5As shown, the transmission component is a rack 231; one end of the rack 231 is fixedly connected to the sliding member 300, and the end of the rack 231 away from the sliding member 300 is meshed with the output end of the motor 220.

[0051] It should be noted that the output end of the motor 220 is perpendicular to the length direction of the rack 231. The output end of the motor 220 is fixedly equipped with a gear 221 that matches the rack 231. The rack 231 is meshed with the gear 221. The end of the rack 231 away from the motor 220 is fixedly connected to the slider 300. The motor 220 drives the gear 221 to rotate. The output end of the motor 220 rotates in the forward direction, driving the gear 221 to rotate. The rack 231 and the gear 221 mesh with each other, thereby converting the rotational motion of the gear 221 into the linear motion of the rack 231. The rack 231 moves back and forth along its length direction under the drive of the gear 221. The back and forth movement of the rack 231 drives the slider 300 to move synchronously. The slider 300 slides linearly along the slide rail on the horn-shaped outer shell 210. Since the other end of the slider 300 is fixedly connected to the flap 140, the movement of the slider 300 drives the flap 140 to open or close.

[0052] In one possible implementation, such as Figure 6 As shown, the transmission component is a lead screw 232; one end of the lead screw 232 is threadedly connected to the sliding member 300, and the end of the lead screw 232 away from the sliding member 300 is fixedly connected to the output end of the motor 220. It should be noted that the output end of the motor 220 is coaxially arranged with the lead screw 232, and one end of the lead screw 232 is fixedly connected to the output end of the motor 220. The sliding member 300 has a threaded hole 320 that matches the lead screw 232. The sliding member 300 is sleeved on the outer wall of the lead screw 232 through the threaded hole 320 and threadedly connected to the lead screw 232. The motor 220 drives the lead screw 232 to rotate, thereby causing the sliding block on the lead screw 232 to reciprocate along the length of the lead screw 232. Since the other end of the sliding member 300 is fixedly connected to the flap 140, the movement of the sliding member 300 further drives the flap 140 to open or close.

[0053] In one possible implementation, such as Figure 5 , Figure 6 , Figure 8As shown, a fixed support 410 is provided inside the bull horn-shaped outer shell 210. The fixed support 410 is sleeved on the lead screw 232 and is located between the motor 220 and the sliding member 300. It should be noted that the fixed support 410 is used to provide support for the lead screw 232. The fixed support 410 is installed on the blade 110 and located in the cavity of the bull horn-shaped outer shell 210. The fixed support 410 is provided with ball bearings 420, and the lead screw 232 is located between the fixed support 410 and the ball bearings 420. When the lead screw 232 rotates, the ball bearings 420 roll between the lead screw 232 and the fixed support 410, converting the sliding friction between the lead screw 232 and the fixed support 410 into rolling friction, reducing the frictional force between the lead screw 232 and the fixed support 410, reducing energy loss, improving transmission efficiency, and extending service life.

[0054] In one possible implementation, such as Figure 3 As shown, a preset angle is provided between the length direction of the blade tip 120 and the length direction of the folding blade 121. It should be noted that a suitable preset angle enables the folding blade 121 to generate additional lift under the action of airflow, which is equivalent to increasing the effective aerodynamic area and lift coefficient of the blade 110, which helps to capture more wind energy at the same wind speed and improve the wind energy utilization efficiency of the wind turbine 520.

[0055] In one possible implementation, the preset angle of the bending wing is in the range of 30°–50°.

[0056] In one possible implementation, the width of the blade tip 120 is in the range of 4m to 5m. Compared with the existing blade tip 120, the blade tip 120 of this application can effectively receive wind energy and improve the utilization rate of wind energy by increasing the width.

[0057] In one possible implementation, such as Figure 2 , Figure 9 As shown, the main body of blade 110 has a curved airfoil structure. It should be noted that blade 110 has a preset bending angle, which refers to the degree of bending of blade 110 along its length direction, that is, the angle formed by blade 110 and the plane of rotation from blade root 130 to blade tip 120. By setting the preset bending angle, the curved airfoil structure of blade 110 can reduce airflow separation and eddies, thereby enabling blade 110 to capture wind energy more effectively, improve wind energy utilization efficiency, generate more electricity at the same wind speed, and improve the energy output efficiency of wind turbine 520.

[0058] Preferably, the range of the preset bending angle is 9° to 12°.

[0059] In one possible implementation, such as Figure 12 As shown, a noise-absorbing part 111 is provided on the windward side 102 of the blade 110. The noise-absorbing part 111 matches the outer contour of the windward side 102 of the blade 110. The noise-absorbing part 111 is fixedly attached to the windward side 102 of the blade 110. The high-speed rotation of the blade 110 and the friction with the air will generate noise. By setting the noise-absorbing part 111, the noise generated by the operation of the blade 110 can be effectively absorbed and blocked, reducing environmental interference and noise pollution.

[0060] Furthermore, the sound-absorbing part 111 is made of sound-absorbing material, preferably sound-absorbing cotton.

[0061] Based on the blade structure 100 of any of the above-mentioned wind turbine generators 520, this application also provides a wind turbine generator 520, such as... Figure 13 As shown, it includes: blade structure 100, transmission hub 510, generator 520 and tower 530. The generator 520 is fixedly installed on the tower 530. The transmission hub 510 is connected to the rotor of the generator 520. There are two or more blade structures 100, and the two or more blade structures 100 are evenly arranged along the circumference of the transmission hub 510.

[0062] It should be noted that the tower 530 is suitable for mounting the wind turbine 520 to the installation location. When wind blows over the blades 110, according to aerodynamic principles, a pressure difference is generated between the front and side windward surfaces of the blade structure 100. This pressure difference causes the blade structure 100 to experience a force perpendicular to the airflow direction, thus causing the blade structure 100 to rotate around the drive hub 510. This converts wind energy into rotational mechanical energy of the blade structure 100. The rotation of the blade structure 100 drives the connected drive hub 510 to rotate as well. The drive hub 510 transmits the rotational mechanical energy to the generator 520, which converts the mechanical energy into electrical energy. The generated electrical energy is transmitted to the power grid through transmission lines to achieve power supply. The wind turbine 520 of this application can effectively capture wind energy by increasing the number and width of the blades 110, thereby shortening the length of the blades 110, reducing noise, and improving the power generation efficiency of the wind turbine.

[0063] Preferably, the wind turbine 520 is equipped with a five-blade structure 100, and the five blades 110 are evenly distributed along the circumference of the wind power transmission hub 510.

[0064] In one possible implementation, a control device is also included. The control device is located inside the cavity of the transmission hub 510. The input terminals of the motors 220 of two or more drive devices 200 are electrically connected to the input terminal of the control device. The output terminal of the control device is electrically connected to a host computer. The operator sends control commands to the control device through the host computer. The control device controls two or more drive devices 200 to work synchronously according to the commands sent by the host computer, thereby realizing the deployment or closure of the flaps 140.

[0065] Furthermore, the control device employs a programmable logic controller (PLC) from existing technologies.

[0066] In one possible implementation, a detection device is also included, which is mounted on the tower 530. The output of the detection device is electrically connected to the input of the control device. The detection device is suitable for transmitting the detected wind speed data to the control device. The control device turns the motor 220 on or off based on the received wind speed data, thereby driving the flap 140 to expand or close. Through the coordinated work of the control device and the detection device, intelligent linkage control is achieved.

[0067] Furthermore, the detection device uses an anemometer, which is a technology already in use.

[0068] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A blade structure for a wind turbine generator, characterized in that, include: Blades, blade tips, blade roots, flaps, and two or more drive mechanisms; The leaf root and the leaf tip are respectively located at both ends of the leaf blade, and the leaf blade gradually widens from the leaf root to the leaf tip; Two or more of the aforementioned driving devices are disposed within the cavity of the blade and are equidistantly distributed along the length of the blade. The output ends of the two or more driving devices penetrate the trailing edge of the blade and are fixedly connected to the flap, which is suitable for controlling the opening or closing of the flap. The tip of the blade is provided with a bent wing.

2. The blade structure of the wind turbine generator according to claim 1, characterized in that, Each of the two or more drive devices includes: a bull horn-shaped housing, a motor, a transmission component, and a sliding component; The bull horn shell is fixedly installed in the cavity of the blade. The motor is arranged adjacent to the bull horn shell. The sliding member is slidably connected to the bull horn shell, and one end of the sliding member is fixedly connected to the flap. The other end of the sliding member is connected to the output end of the motor through the transmission member.

3. The blade structure of the wind turbine generator according to claim 2, characterized in that, The transmission component is a rack; One end of the rack is fixedly connected to the slider, and the end of the rack away from the slider is engaged with the output end of the motor.

4. The blade structure of the wind turbine according to claim 2, characterized in that, The transmission component is a lead screw; One end of the lead screw is threadedly connected to the sliding member, and the end of the lead screw away from the sliding member is fixedly connected to the output end of the motor.

5. The blade structure of the wind turbine according to claim 4, characterized in that, The outer shell of the bull horn is equipped with a fixed support; The fixed support is sleeved on the lead screw and located between the motor and the sliding member.

6. The blade structure of the wind turbine according to claim 1, characterized in that, A preset angle is provided between the length direction of the blade tip and the length direction of the bending wing.

7. The blade structure of the wind turbine according to claim 6, characterized in that, The preset angle ranges from 30° to 50°.

8. The blade structure of the wind turbine according to claim 1, characterized in that, The blade has a curved airfoil structure.

9. A wind turbine generator, characterized in that, include: The blade structure, drive hub, generator, and tower as described in any one of claims 1-8; The generator is fixedly mounted on the tower, and the transmission hub is connected to the rotor of the generator. The blade structure has two or more blades, which are evenly arranged along the circumference of the transmission hub.

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