Wind turbine blades

Abstract

This invention relates to a wind turbine blade, comprising: a mounting head; a blade body connected to the mounting head; a folding mechanism connected to the blade body, including a drive motor, a first gear, a second gear, and a coupling, wherein the drive motor is fixedly connected to the blade body; the first gear is connected to the output end of the drive motor; the second gear meshes with the first gear; the coupling connects the first gear and the second gear; a blade tip connected to the folding mechanism; and a control component disposed on the blade body, including a sensor and a controller, wherein the sensor is disposed on the surface of the blade body; the controller is connected to the sensor and also to the drive motor. This wind turbine blade is equipped with a folding mechanism, and the controller is connected to the sensor and the drive motor. Therefore, the controller can automatically fold up the blade tip according to changes in pressure, thereby improving the energy capture efficiency below the rated wind speed, stabilizing the wind turbine output power, and when the wind speed is too high and shutdown is required, the blade tip folds downwards, which can reduce the rotor speed and assist in shutdown.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, and in particular to wind turbine blades. Background Technology

[0002] With the increasing development of clean energy, wind power, as a typical green and pollution-free clean energy source, has received increasing attention. Wind turbines are crucial equipment in wind power generation, integrating wind energy capture and energy conversion.

[0003] Generally, a wind turbine works by rotating a rotor under the influence of wind, converting the kinetic energy of the wind into the mechanical energy of the rotor shaft. This mechanical energy is then connected to a generator, which drives the generator rotor to rotate, thus converting the mechanical energy into electrical energy. Traditional wind turbine blades are mostly formed by laying out multiple consecutive airfoil sections. Furthermore, researchers have proposed various improvement methods, such as adding vortex generators to the blade body surface to increase output power, and adding flaps to the trailing edge of the blade body to optimize aerodynamic performance and reduce aerodynamic noise. However, the blade lengths of these wind turbines are fixed, making it impossible to automatically adjust the blade body length to change the windward area of ​​the rotor based on the incoming wind speed, nor can it automatically adjust the blade tip structure according to the incoming wind speed. Therefore, it is impossible to stably maintain the output power of the wind turbine.

[0004] In summary, the fixed blade length of traditional wind turbines makes it impossible to stably maintain the output power of wind turbines. Summary of the Invention

[0005] Therefore, it is necessary to provide a wind turbine blade that addresses the problem of traditional wind turbine blades having fixed lengths and being unable to stably maintain the output power of the wind turbine.

[0006] A wind turbine blade, comprising:

[0007] Install head;

[0008] The blade body is connected to the mounting head;

[0009] A folding mechanism, connected to the blade body, includes a drive motor, a first gear, a second gear, and a coupling. The drive motor is fixedly connected to the blade body; the first gear is connected to the output end of the drive motor; the second gear meshes with the first gear; and the coupling connects the first gear and the second gear.

[0010] The leaf tip is connected to the folding mechanism;

[0011] A control component, which is disposed on the blade body, includes a sensor and a controller. The sensor is disposed on the surface of the blade body; the controller is connected to the sensor and to the drive motor.

[0012] In one embodiment, the side of the blade tip connected to the folding mechanism is provided with a blade tip gear groove, and the side of the blade body connected to the folding mechanism is provided with a blade body gear groove.

[0013] In one embodiment, the folding mechanism further includes at least four hollow clamps, at least four bolts, and at least four bolt washers. The hollow clamps are respectively placed on the sides of the blade body and the blade tip near the folding mechanism. Each hollow clamp is fixedly connected to the blade body or the blade tip it contacts by one bolt and one bolt washer.

[0014] In one embodiment, the sensor includes a suction surface pressure sensor and a pressure surface pressure sensor, the suction surface pressure sensor and the pressure surface pressure sensor being positioned on the side close to the folding mechanism.

[0015] In one embodiment, the blade body is provided with a wire groove that extends to the drive motor, the controller, the suction surface pressure sensor, and the pressure surface pressure sensor.

[0016] In one embodiment, blade tip stops are provided on the side where the blade tip connects to the folding mechanism and on both sides of the second gear; blade stops are provided on the side where the blade body connects to the folding mechanism and on both sides of the first gear.

[0017] In one embodiment, a drive groove is provided in one of the blade blocks on the blade body, and a drive motor is installed in the drive groove.

[0018] In one embodiment, the controller is mounted on the hollow clamp on the blade body.

[0019] In one embodiment, the gear flipping mechanism further includes a rubber sealing strip, which is disposed on the edge of the surface of the blade body and the blade tip that contacts the flipping mechanism.

[0020] In one embodiment, the wind turbine blade further includes a retractable rubber cover, which is placed outside the folding mechanism and connects the blade tip to the blade body via the rubber sealing strip.

[0021] The aforementioned wind turbine blades are equipped with a folding mechanism. The controller is connected to the sensor and the drive motor. Therefore, the controller can autonomously control the motor to rotate forward and backward, thereby automatically folding the blade tip according to the change in the pressure difference at the leading edge of the blade body. This improves the energy capture efficiency of the blade body at wind speeds below the rated speed, stabilizes the output power of the wind turbine, and quickly reduces the speed of the wind turbine, assisting in the shutdown of the unit. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a diagram showing the overall structure of a wind turbine blade.

[0024] Figure 2 This is a schematic diagram of the tip structure of a wind turbine blade.

[0025] Figure 3 This is a schematic diagram of the main structure of a wind turbine blade.

[0026] Figure 4 for Figure 3 A magnified view of a portion of the blade body shown;

[0027] Figure 5 A schematic diagram of wind turbine blade installation;

[0028] Figure 6 for Figure 5 A partially enlarged view of the installation diagram shown;

[0029] Figure 7 This is a schematic diagram of a retractable rubber cover for a wind turbine blade.

[0030] Figure label:

[0031] 100. Wind turbine blade; 110. Blade body; 111. Wire guide groove; 112. Blade body gear groove; 120. Blade tip; 121. Blade tip gear groove; 130. Folding mechanism; 131. Hollow clamp; 132. Bolt; 133. Bolt washer; 134. Drive motor; 135. Drive motor shaft; 136. First gear; 137. Second gear; 138. Coupling; 139. Rubber sealing strip; 140. Mounting head; 150. Control assembly; 151. Suction surface pressure sensor; 152. Pressure surface pressure sensor; 153. Controller; 160. Retractable rubber cover. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0034] 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 at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0037] The following is combined with Figures 1-7 The wind turbine blade 100 of the present invention is described.

[0038] like Figure 1 As shown, in one embodiment, a wind turbine blade 100 includes: a mounting head 140; a blade body 110 connected to the mounting head 140; a folding mechanism 130 connected to the blade body 110, including a drive motor 134, a first gear 136, a second gear 137, and a coupling 138; the drive motor 134 is fixedly connected to the blade body 110; the first gear 136 is connected to the output end of the drive motor 134; the second gear 137 meshes with the first gear 136; the coupling 138 is used to connect the first gear 136 and the second gear 137; a blade tip 120 connected to the folding mechanism 130; and a control component 150 disposed on the blade body 110, including a sensor and a controller 153; the sensor is disposed on the surface of the blade body 110; the controller 153 is connected to the sensor and to the drive motor 134. The blade tip 120 is provided with a blade tip gear groove 121 on the side connected to the folding mechanism 130, and the blade body 110 is provided with a blade body gear groove 112 on the side connected to the folding mechanism 130.

[0039] The wind turbine blade 100 includes a blade tip 120 and a blade body 110, which are connected by a folding mechanism 130. One end of the blade body 110 is provided with an mounting head 140 and is connected to the wind turbine through the mounting head 140. The end of the blade body 110 away from the mounting head 140 is connected to the folding mechanism 130, and the other side of the folding mechanism 130 is connected to the blade tip 120.

[0040] like Figure 2 and Figure 5 As shown, the thickness of the blade tip 120 is smaller than its surface size. The thickness of the blade tip 120 gradually decreases from the side where it connects to the folding mechanism 130 towards the side away from the folding mechanism 130. The surface of the blade tip 120 is... Figure 2 The thickness of the blade tip 120 in the plane shown is Figure 5 The distance between the two surfaces of the blade tip 120 is shown. The farthest point of the blade tip 120, i.e. Figure 2 The top horizontal line shown represents the 120mm width of the leaf tip. Figure 2 As shown in the horizontal dimension, the width of the farthest end of the blade tip 120 is smaller than the width of the section connecting the blade tip 120 and the folding mechanism 130. Simultaneously, the blade tip 120 is provided with a blade tip gear groove 121 for accommodating the second gear 137. The blade tip gear groove 121 should be located on the side of the blade tip 120 connected to the folding mechanism 130. Furthermore, to better utilize the folding mechanism 130, as... Figure 2 As shown, the blade tip gear groove 121 is preferably located in the middle area of ​​the side of the blade tip 120.

[0041] like Figure 1and Figure 3 As shown, the thickness of the blade body 110 is Figure 1 The vertical dimensions shown indicate that the thickness of the blade body 110 is much smaller than the dimensions on its surface. One end of the blade body 110 is connected to a mounting head 140, which mounts the blade body 110 onto the wind turbine. This mounting head 140 can be a wind turbine hub mounting head or another structure connected to the wind turbine, but functionally it connects the blade body 110 to the wind turbine. The end of the blade body 110 furthest from the mounting head 140 is connected to a folding mechanism 130, such as... Figure 1 The leftmost end of the blade body 110 and the rightmost end of the blade tip 120 are connected to the folding mechanism 130, respectively.

[0042] The folding mechanism 130 is located between the blade tip 120 and the blade body 110. The blade tip 120 can rotate around the folding mechanism 130 with the folding mechanism 130 as its center line. Figure 1 As shown, the blade tip 120 is currently rotating upwards. Alternatively, the blade tip 120 can be flush with the blade body 110 without rotating. Furthermore, the blade tip 120 can also rotate downwards. The direction of rotation of the blade tip 120 depends on the direction in which the gear driven by the drive motor 134 rotates.

[0043] The folding mechanism 130 includes a drive motor 134, which is installed on the side of the blade body 110 connected to the folding mechanism 130. The drive motor 134 can be directly connected to the side of the blade body 110 or indirectly connected to it.

[0044] The first gear 136 meshes with the second gear 137, and the first gear 136 and the second gear 137 are connected by a coupling 138. Figure 4 As shown, the center of the first gear 136 and the center of the second gear 137 are connected on the same side of the first gear 136 and the second gear 137 via a first coupling 138, and on the other side of the first gear 136 and the second gear 137 via a second coupling 138. The first gear 136 is fixed in position via a drive motor shaft 135, and the drive motor shaft 135 is fixed in position via a drive motor 134. The second gear 137 is fixed in position via the first gear 136. Through the above connection method, the folding mechanism 130 is connected to the blade body 110.

[0045] The first gear 136 is radially perpendicular to the side where the blade body 110 connects to the folding mechanism 130. Therefore, a blade body gear groove 122 is formed on the side where the blade body 110 connects to the folding mechanism 130. A portion of the first gear 136 can be placed in the blade body gear groove 122 to prevent the first gear 136 from colliding with the blade body 110. Similarly, the second gear 137 is radially perpendicular to the side where the blade tip 120 connects to the folding mechanism 130. Therefore, a blade tip gear groove 121 is formed on the side where the blade tip 120 connects to the folding mechanism 130. A portion of the second gear 137 can be placed in the blade tip gear groove 121 to prevent the second gear 137 from colliding with the blade tip 120.

[0046] Control component 150 includes a sensor and a controller 153. The sensor is positioned on the blade body 110, on a surface that does not contact the folding mechanism 130 and the mounting head 140. In this embodiment, for example... Figure 4 As shown, the sensor is mounted on one side of the blade body 110, which connects the folding mechanism 130 and the mounting head 140, and is not the surface of the blade body 110. The surface of the blade body 110 is... Figure 3 The surface with the largest area shown is also Figure 1 The surface represented by the lines above the blade body 110 shown.

[0047] The controller 153 connects the sensor and the drive motor 134. The controller 153 receives the signal sent by the sensor, compares it with the preset data, sends a rotation command to the drive motor 134, controls the drive motor 134 to start or stop rotating, and controls the rotation direction of the drive motor 134.

[0048] When operating below the rated incoming wind speed, the sensor on the blade body 110 senses the change in blade pressure difference and transmits it to the controller 153 via an electrical signal. The controller 153 controls the motor to drive counterclockwise, causing the first gear 136 to rotate. The first gear 136 then drives the second gear 137 to rotate in the opposite direction, thereby causing the blade tip 120 to bend upward at a certain angle. When operating at the rated wind speed, if the sensor on the blade body 110 senses a pressure difference within the rated range, the controller 153 and the drive motor 134 maintain the blade tip 120 and the blade body 110 at 180 degrees in the spanwise direction. When operating above the cutoff wind speed, the blade body... The sensor on body 110 senses the pressure difference change and transmits it to controller 153 via electrical signal. Controller 153 controls the motor to drive clockwise, which drives the first gear 136 to rotate. The first gear 136 drives the second gear 137 to rotate in the opposite direction, thereby causing the blade tip 120 to fold downward at a certain angle. Controller 153 can autonomously control the motor to rotate forward and backward, so as to automatically fold the blade tip 120 according to the change of pressure difference at the leading edge of the wind turbine blade 100. This improves the energy capture efficiency of the blade at wind speeds below the rated speed, stabilizes the output power, and quickly reduces the speed of the wind turbine blade 100, assisting in the shutdown of the wind turbine.

[0049] Compared with the traditional fixed length of wind turbine blades 100, the wind turbine blades 100 in this embodiment can automatically adjust the direction of the blade tip 120 according to the incoming wind speed, and at the same time change the length of the wind turbine blades 100, which is beneficial to stabilizing the output power of the wind turbine under different incoming wind speeds.

[0050] like Figure 2 and Figure 4 As shown, in one embodiment, blade tip 120 stops are provided on the side where the blade tip 120 connects to the folding mechanism 130, and on both sides of the second gear 137; blade stops are provided on the side where the blade body 110 connects to the folding mechanism 130, and on both sides of the first gear 136. One of the blade stops on the blade body 110 has a drive groove, and a drive motor 134 is installed in the drive groove.

[0051] Since the wind turbine blade 100 is directly affected by the wind, in order to protect the folding mechanism 130 from being affected and improve its service life, baffles can be set at both ends of the blade tip 120 and the side of the blade body 110 connected to the folding mechanism 130.

[0052] like Figure 2The blade tip 120 structure shown has blade tip 120 stops on both the bottom left and right sides. The left side of the left blade tip 120 stop is smoothly connected to the left side of the blade tip 120. In other words, the left side of the left blade tip 120 stop neither extends beyond the left side of the blade tip 120, nor is it to the right of the left side of the blade tip 120; that is, the left side of the left blade tip 120 stop does not reach the plane containing the left side of the blade tip 120. Similarly, the right side of the right blade tip 120 stop is smoothly connected to the right side of the blade tip 120.

[0053] like Figure 4 The blade body 110 structure shown has blade stops at both ends on the side where it connects to the folding mechanism 130. The left side of the left blade stop is smoothly connected to the left side of the blade. In other words, the left side of the left blade stop neither extends beyond the left side of the blade, nor is it to the right of the left side of the blade; that is, the left side of the left blade stop does not reach the plane containing the left side of the blade. Similarly, the right side of the right blade stop is smoothly connected to the right side of the blade.

[0054] like Figure 4 As shown, a drive groove is provided in one of the side blocks, with the opening of the drive groove facing inward, and a drive motor 134 is installed in the drive groove. In this embodiment, the drive groove is set as follows: Figure 4 The left-end blade stop is shown, with the opening facing the left-end blade stop, that is, facing the first gear 136. The drive motor 134 needs to be connected to the blade body 110, either directly or indirectly. In this embodiment, the drive motor 134 is indirectly connected to the blade body 110. The left-end blade stop is fixedly connected to the blade body 110, and a drive groove is provided in the left-end blade stop. The drive motor 134 is fixedly installed in the drive groove, and the drive motor 134 and the blade body 110 are fixedly connected through the left-end blade stop.

[0055] Installing the drive motor 134 inside the blade stop block serves two purposes: first, it fulfills the connection requirement between the drive motor 134 and the blade body 110; second, placing the drive motor 134 within a cavity such as a drive slot, which has an opening on only one side to communicate with the outside, while the other sides are sealed, effectively prevents the drive motor 134 from directly facing high-speed winds, being impacted by flying objects, or falling in with dust and rainwater, thus effectively protecting the drive motor 134 and extending its service life.

[0056] The output end of the drive motor 134 in the drive slot is connected to the first gear 136. This connection can be direct or indirect. However, in this embodiment, due to the large width of the blade tip 120 and the large distance between the output end of the drive motor 134 and the first gear 136, a drive motor shaft 135 is used. One end of the drive motor shaft 135 is connected to the output end of the drive motor 134, and the other end is connected to the center of the first gear 136. The drive motor 134 and the first gear 136 are connected via the drive motor shaft 135. The drive motor 134 controls the rotation of the first gear 136 through the drive motor shaft 135.

[0057] Furthermore, to accurately measure the incoming airflow velocity at the connection between the blade tip 120 and the blade body 110, and to reduce the difficulty of connecting the sensor and the controller 153, the sensor can be placed on the outer side of a block on the blade body 110 that does not have a drive groove; the outer side is the side furthest from the other block. Figure 4 As shown, the sensor is set on the right side of the right end blade block. The sensor can accurately measure the incoming wind speed at the connection between the blade tip 120 and the blade body 110. Because it is close to the controller 153, it is easy for the two to be connected by circuit. At the same time, the main components of the wind turbine blade 100, except for the mounting head 140, are concentrated in one area, which facilitates the subsequent maintenance and inspection of the wind turbine blade 100 and saves operating costs.

[0058] like Figure 2 and Figure 4 As shown, in one embodiment, the folding mechanism 130 further includes at least four hollow clamping plates 131, at least four bolts 132 and at least four bolt washers 133. The hollow clamping plates 131 are respectively placed on the sides of the blade body 110 and the blade tip 120 near the folding mechanism 130. Each hollow clamping plate 131 is fixedly connected to the contacting blade body 110 or blade tip 120 by a bolt 132 and a bolt washer 133.

[0059] The folding mechanism 130 also includes at least four hollow clamping plates 131. In this embodiment, the folding mechanism 130 is provided with four hollow clamping plates 131, such as... Figure 2 As shown, on the side where the blade tip 120 connects to the folding mechanism 130, a hollow clamping plate 131 is provided on both sides of the blade tip gear groove 121, with the left side being the first clamping plate and the right side being the second clamping plate. Figure 4 As shown, on the side where the blade body 110 is connected to the folding mechanism 130, a hollow clamping plate 131 is provided on both sides of the blade body gear groove 112. The third clamping plate is closer to the drive motor 134, and the fourth clamping plate is closer to the sensor, for a total of four hollow clamping plates 131.

[0060] The first and second clamping plates are on the same plane. The first clamping plate is opposite to the fourth clamping plate, and the second clamping plate is opposite to the third clamping plate. When the blade tip 120 is at a 180-degree angle to the blade body 110, the first and fourth clamping plates are parallel, and the second and third clamping plates are parallel. The blade tip gear groove 121 between the first and second clamping plates is opposite to the blade body gear groove 112 between the third and fourth clamping plates. When the blade tip 120 is at a 180-degree angle to the blade body 110, the blade body gear groove 112 is parallel to the blade tip gear groove 121.

[0061] Any clamp is fixedly connected to the wind turbine blade 100 by at least one bolt and at least one bolt washer 133. In this embodiment, as... Figure 4 As shown, a bolt is connected to the center of any clamping plate, and a bolt washer 133 is sandwiched between a bolt and a hollow clamping plate 131. In this embodiment, the wind turbine blade 100 uses a total of 4 bolts and 4 bolt washers 133 on the folding mechanism 130. The hollow clamping plate 131 can effectively shield the sides of the blade body 110 and blade tip 120 that are connected to the folding mechanism 130, preventing direct impact from foreign objects, further protecting the safety of the blade body 110 and blade tip 120, and increasing service life.

[0062] like Figure 4 and Figure 5 As shown, in one embodiment, the sensors in the control assembly 150 include a suction surface pressure sensor 151 and a pressure surface pressure sensor 152, which are positioned near the folding mechanism 130. A wire groove 111 is provided on the blade body 110, extending to the drive motor 134, controller 153, suction surface pressure sensor 151, and pressure surface pressure sensor 152. The controller 153 is mounted on a hollow clamping plate 131 on the blade body 110.

[0063] The suction surface pressure sensor 151 and the pressure surface pressure sensor 152 in the control component 150 measure different pressure data respectively and transmit the pressure data to the controller 153. The controller 153 receives the suction surface and pressure surface data, calculates the difference between the suction surface and the pressure surface, and compares the pressure difference with the preset value according to the preset program. Based on the comparison between the real-time pressure difference obtained by the controller 153 and the preset value, the controller 153 issues corresponding counterclockwise, clockwise, or no-rotation commands to the drive motor 134. The drive motor 134 rotates counterclockwise, clockwise, or no-rotation, which drives the first gear 136 to rotate through the drive motor shaft 135. Due to the meshing relationship between the first gear 136 and the second gear 137, the second gear 137 is driven to rotate. Since the second gear 137 is connected to the blade tip 120, the blade tip 120 is driven to rotate upward, downward, or no-rotation accordingly.

[0064] In this embodiment, as Figure 4 As shown, the suction surface pressure sensor 151 and the pressure surface pressure sensor 152 are both located on the right side of the right end blade stop, distributed vertically along the thickness direction of the blade. The controller 153 is mounted on the hollow clamping plate 131 on the blade body 110. In this embodiment, it is mounted on the fourth clamping plate between the first gear 136 and the right end blade stop. The blade body 110 is provided with a wire groove 111. In this embodiment, a portion of the exposed area of ​​the wire groove 111 is located on the side of the blade body 110 connected to the folding mechanism 130. The wire groove 111 is located above the third clamping plate, the fourth clamping plate, and the blade body gear groove 112, but does not exceed the upper surface of the blade body 110 and the upper surface of the blade stop. The wire groove 111 connects the drive motor 134, the controller 153, the suction surface pressure sensor 151, and the pressure surface pressure sensor 152.

[0065] The controller 153 is connected to the suction surface pressure sensor 151, the pressure surface pressure sensor 152 and the drive motor 134 respectively. The suction surface pressure sensor 151 and the pressure surface pressure sensor 152 transmit signals to the controller 153. The controller 153 processes the received signals according to a preset program. After processing, the controller 153 sends corresponding instructions to the controller 153 according to the processing results.

[0066] The suction surface pressure sensor 151 and the pressure surface pressure sensor 152 are installed to measure the pressure difference, obtain the incoming airflow speed more accurately, and thus control the folding state of the blade tip 120 more precisely. The lead wire groove can be set up to make the connection wires between the control component 150 and the driver clear, which facilitates subsequent maintenance and testing. The control component 150 is placed in the adjacent area and close to the drive motor 134, which simplifies the internal connection of the control component 150 and the connection between the control component 150 and the drive motor 134. This not only reduces the cost of the wind turbine blade 100 autonomously controlling the folding of the blade tip 120, but also reduces the maintenance work caused by the damage of the long connection wires.

[0067] like Figure 4 , Figure 6 and Figure 7 As shown, in one embodiment, the gear folding mechanism 130 further includes a rubber sealing strip 139, which is disposed on the edge of the surface of the blade body 110 and the blade tip 120 that contacts the folding mechanism 130. The wind turbine blade 100 also includes a retractable rubber cover 160, which is placed outside the folding mechanism 130 and connects the blade tip 120 and the blade body 110 through the rubber sealing strip 139.

[0068] like Figure 4 As shown, a rubber sealing strip 139 is provided on the upper edge line and the lower edge line of the side where the blade body 110 is connected to the folding mechanism 130. A part of the rubber sealing strip 139 on the upper edge line is placed on the upper surface of the blade body 110 and is located on one side of the upper surface, which is the upper edge line. Similarly, a part of the rubber sealing strip 139 on the lower edge line is placed on the lower surface of the blade body 110 and is located on one side of the lower surface, which is the lower edge line.

[0069] The rubber sealing strip 139 on the blade tip 120 is similarly configured to the rubber sealing strip 139 on the blade body 110. For example... Figure 6 As shown, a rubber sealing strip 139 is provided on the upper edge and lower edge of the side where the blade tip 120 connects to the folding mechanism 130.

[0070] like Figure 7 As shown, an upper retractable rubber cover 160 is provided between the rubber sealing strip 139 on the upper edge of the blade tip 120 and the rubber sealing strip 139 on the upper edge of the blade body 110; a lower retractable rubber cover 160 is provided between the rubber sealing strip 139 on the lower edge of the blade tip 120 and the rubber sealing strip 139 on the lower edge of the blade body 110.

[0071] When the blade tip 120 folds upwards or downwards, the elasticity of the retractable rubber cover 160 ensures that the blade tip 120 is tightly connected to the blade body 110, while preventing rainwater, mud, and other contaminants from entering the blade. When the blade tip 120 is not folded, i.e., the blade tip 120 is at a 180-degree angle to the blade body 110, the retractable rubber cover 160 can cover the folding mechanism 130, and also prevent rainwater, dust, and flying insects from entering the blade. This effectively protects the folding mechanism 130 and the structure of the blade tip 120 and the blade body 110, while also assisting in the connection between the blade tip 120 and the blade body 110.

[0072] When the wind turbine operates below the rated incoming wind speed, the suction surface pressure sensor 151 and the pressure surface pressure sensor 152 at the leading edge of the blade body 110 sense the change in pressure difference between the suction surface and the pressure surface of the blade body 110. This is transmitted to the controller 153 via an electrical signal. The controller 153 drives the motor 134 counterclockwise, which in turn drives the first gear 136 to rotate. The first gear 136 then drives the second gear 137 to rotate in the opposite direction, causing the blade tip 120 to fold upward at a certain angle. Under the elastic action of the retractable rubber cover 160, the blade tip 120 is tightly connected to the blade body 110. By presetting the upward folding angle in the controller 153, the blade tip 120 folds upward to this set value, thereby increasing the output power of the wind turbine.

[0073] When the wind turbine is operating at the rated wind speed, when the suction surface pressure sensor 151 and the pressure surface pressure sensor 152 at the leading edge of the blade body 110 sense that the pressure difference of the blade body 110 is within the rated range, the controller 153 and the drive motor 134 keep the blade tip 120 and the blade body 110 at 180 degrees in the spanwise direction.

[0074] When the wind turbine operates above the cutoff wind speed, the suction surface pressure sensor 151 and the pressure surface pressure sensor 152 on the leading edge of the blade body 110 sense the change in pressure difference between the suction and pressure surfaces of the blade body 110. This is transmitted to the controller 153 via an electrical signal. The controller 153 drives the motor 134 clockwise, which in turn drives the first gear 136 to rotate. The first gear 136 then drives the second gear 137 to rotate in the opposite direction, causing the blade tip 120 to fold downwards at a certain angle. By pre-setting the downward folding angle within the controller 153, the blade tip 120 folds downwards to this set value. Folding the blade tip downwards reduces the rotor speed and assists in shutting down the unit.

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A wind turbine blade, comprising: Install head; The blade body is connected to the mounting head; A folding mechanism, connected to the blade body, includes a drive motor, a first gear, a second gear, and a coupling. The drive motor is fixedly connected to the blade body; the first gear is connected to the output end of the drive motor; the second gear meshes with the first gear; and the coupling connects the first gear and the second gear. The leaf tip is connected to the folding mechanism; A control component, mounted on the blade body, includes sensors and a controller. The controller calculates the real-time pressure difference between the suction surface and the pressure surface based on the sensor signals. The sensors are mounted on the surface of the blade body. The sensors include a suction surface pressure sensor and a pressure surface pressure sensor, which are positioned near the folding mechanism. The controller is connected to the sensors and the drive motor. According to a preset program, the controller compares the pressure difference with a preset value. Based on the comparison between the real-time pressure difference obtained by the controller and the preset value, the controller issues corresponding commands to the drive motor to rotate counterclockwise, clockwise, or not rotate. The retractable rubber cover, the folding mechanism further includes a rubber sealing strip, the rubber sealing strip is disposed on the edge of the surface of the blade body and the blade tip that contacts the folding mechanism, the retractable rubber cover is placed outside the folding mechanism, and the blade tip and the blade body are connected by the rubber sealing strip; The blade tip is provided with a blade tip gear groove on the side connected to the folding mechanism, and the blade body is provided with a blade body gear groove on the side connected to the folding mechanism. The folding mechanism also includes at least four hollow clamps, at least four bolts, and at least four bolt washers. The hollow clamps are respectively placed on the sides of the blade body and the blade tip near the folding mechanism. Each hollow clamp is fixedly connected to the blade body or blade tip it contacts by one bolt and one bolt washer.

2. The wind turbine blade according to claim 1, characterized in that, The blade body is provided with a wire groove, which extends to the drive motor, the controller, the suction surface pressure sensor and the pressure surface pressure sensor.

3. The wind turbine blade according to claim 1, characterized in that, On the side where the blade tip connects to the folding mechanism, and on both sides of the second gear, blade tip blocks are provided respectively; on the side where the blade body connects to the folding mechanism, and on both sides of the first gear, blade blocks are provided respectively.

4. The wind turbine blade according to claim 3, characterized in that, One of the blade blocks on the blade body is provided with a drive groove, and a drive motor is installed in the drive groove.

5. The wind turbine blade according to claim 1, characterized in that, The controller is mounted on the hollow clamp on the blade body.

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