Integrated Wind Turbine Blade Device for Bidirectional Rotation and High-Efficiency Wind Energy Capture

Abstract

The present invention discloses an integrated wind turbine blade device for bidirectional rotation and efficient wind energy capture. This device can be adapted to existing mainstream three-blade wind turbines or used to replace traditional wind turbine blade kits, aiming to significantly improve the wind energy utilization efficiency and enhance the operating stability of the blades. The device adopts an innovative triangular integrated blade structure and is designed with a diversion air duct on the side of the blade for efficiently guiding and capturing the lateral wind energy between the blades. The core of the device includes a forward rotation mechanism and a reverse rotation mechanism. Among them, the forward rotation mechanism rotates under the drive of natural wind force, and at the same time, the cyclone is guided through the diversion air duct to drive the reverse rotation mechanism, thus realizing the efficient bidirectional conversion of wind energy. The present invention also adopts support structures such as cables, arches, and rings, greatly improving the wind resistance and operating stability of the blades; by optimizing the design of the blade air guide plate and blade wing, the air flow distribution is made more uniform, further improving the wind energy utilization efficiency.

Description

Technical Field

[0001] The present invention relates to the fields of fan blades and wind energy resource development and utilization. Specifically, it is an integrated wind turbine blade device for bidirectional rotation and efficient wind energy capture. Background Art

[0002] With the continuous growth of global energy demand and the increasingly severe environmental problems, wind energy, as a clean and renewable energy form, has been playing an increasingly important role in the energy structure. As the core equipment for wind energy utilization, the performance of wind turbines directly affects the wind energy conversion efficiency and economy. Traditional wind turbines usually adopt a three-blade structure. The blades rotate under the drive of wind, driving the generator to generate electricity. However, in the prior art, the traditional blade design mainly relies on the forward wind energy drive. During the rotation process, most of the wind energy will be lost at the angles between the blades, resulting in that most of the wind energy is not fully captured and converted. This is also one of the main reasons for the low power generation efficiency of traditional wind turbines. In addition, under strong wind or turbulent conditions, traditional blades are prone to problems such as vibration and deformation, which will also affect the power generation efficiency and increase the equipment maintenance cost. The existing blade designs mostly adopt a split structure, and the installation and maintenance processes are cumbersome, and the requirements for materials and processes are relatively high, resulting in a high overall cost. Summary of the Invention

[0003] In view of the above technical defects, the present invention provides an integrated wind turbine blade device for bidirectional rotation and efficient wind energy capture. By boldly innovating on the basis of the traditional three-blade form, the device adds a diversion air duct and a reverse rotation mechanism that can utilize the lateral wind energy, and realizes the coordinated operation of forward and reverse rotations under the action of natural wind. By optimizing the wind-receiving structure of the blades, the wind energy capture efficiency is improved, and through the reasonable configuration of the reverse rotation mechanism, the wind energy loss between the blades is effectively reduced, the safety of the blades is improved, and their service life is extended. This innovative design is expected to provide new ideas for the development of wind power generation technology and improve the economic benefits and operation stability of wind farms.

[0004] To achieve the above invention object, the present invention adopts the following technical solutions:

[0005] The integrated wind turbine blade device for bidirectional rotation and efficient wind energy capture is a three-blade horizontal-axis wind turbine blade;

[0006] The front view structure of the device is a triangular integrated blade with three blade tips facing outward. In the side view structure, the side of each single blade is a three-dimensional open-type air intake frame. A wind guide plate is arranged between the windward side of the air intake frame and the central part of the device. Wind energy converges through the air intake frame and flows into the diversion air duct through the wind guide plate.

[0007] The externally visible contour and / or structure of the device is a forward rotation mechanism, and a reverse rotation mechanism is provided inside the contour and / or structure;

[0008] The forward rotation mechanism rotates forward under the direct blowing of natural wind, and under the action of the cyclone, the diversion air duct of the side view structure converges the cyclone formed by the blade angles to drive the reverse rotation mechanism arranged inside to operate cyclically;

[0009] Both the forward rotation mechanism and the reverse rotation mechanism belong to rotating parts or rotating accessories;

[0010] The forward rotation mechanism is adapted to be fixedly connected to the rotor of the wind turbine nacelle, and the reverse rotation mechanism is adapted to be rotatably connected to the rotor of the additional motor inside the wind turbine nacelle.

[0011] Preferably, the forward rotation mechanism includes a frame body; the frame body is triangular and is composed of cable ropes, arch frames, ring frames, main frames, support frames, outer wheel frames, air guide plates and skins;

[0012] The skin wraps the frame body, and there are three cable ropes, which are respectively flexibly connected to the three blade tips of the frame body;

[0013] The arch frame is arranged above the reverse rotation mechanism, and the ring frame is arranged around the reverse rotation mechanism;

[0014] The main frame is connected to the arch frame and the ring frame, and the support frame is connected to the main frame and the outer wheel frame;

[0015] The air guide plate is an arc-shaped panel and is composed of a large arc panel and a small arc panel.

[0016] Preferably, the forward rotation mechanism further includes a cylinder frame, the cylinder frame is a tube structure, a flange cover plate is arranged at the upper end of the cylinder frame, a solid shaft rod is arranged at the upper end of the flange cover plate, and the solid shaft rod penetrates through the flange cover plate and is fixedly connected to the head at the bottom of the cylinder frame.

[0017] Preferably, the forward rotation mechanism further includes three blade wings, the blade wings are triangular, one of which is a long arc angle, the blade wings are arranged at the side position close to the blade tip, and the installation direction of the long arc angle is inward.

[0018] Preferably, the reverse rotation mechanism is composed of an impeller and a shaft gear;

[0019] The shaft gear includes two parts, an outer gear at the lower part and a sleeve at the upper part, and the sleeve is arranged at the bottom of the flange cover plate and is rotatably connected to the cylinder frame;

[0020] The impeller is fixedly arranged around the outer diameter of the sleeve, and the shaft gear is rotatably connected to the cylinder frame.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The one-piece wind turbine blade device for bidirectional rotation and efficient wind energy capture of the present invention is adapted to most existing mainstream three-blade wind turbines or to replace traditional wind turbine blade kits. It adopts an integrated blade structure and introduces lateral wind energy, a cyclone diversion air duct and a reverse rotation mechanism to improve the wind energy utilization rate, enhance the structural stability of the blade and extend its service life. Its structure includes a forward rotation mechanism and a reverse rotation mechanism. Among them, the blade of the forward rotation mechanism adopts a triangular integrated design and forms a diversion air duct with a wind guiding function in the side view structure. This air duct can converge the cyclones generated in the blade angle area, make them act on the internal reverse rotation mechanism, and then drive the impeller and shaft gear to operate, realizing the efficient capture and conversion of wind energy.

[0023] Compared with the prior art, the blade of the present invention can not only utilize the forward wind energy, but also reduce the loss of lateral wind energy through a reasonable air flow guiding structure, improving the overall wind energy conversion efficiency. The internal structure of the blade adopts high-strength materials and combines support components such as cables, arches and ring frames. The structure is simple and easy to install, and the stress is balanced in high wind speed environments, reducing the impact of wind pressure shock on the blade. In addition, the optimized design of the wind guiding plate and the blade wing makes the air flow entering the air duct more uniform, reducing the turbulent flow loss and further enhancing the wind energy capture ability.

[0024] During operation, the forward rotation mechanism of the present invention rotates under the action of natural wind, and guides the lateral wind energy into the reverse rotation mechanism through the diversion air duct, forming a stable auxiliary power system. This bidirectional rotation mode not only improves the wind energy utilization efficiency, but also reduces the uneven local stress of the blade through reasonable air flow distribution, enhancing the stability of the wind turbine operation. Especially in strong wind or bad weather conditions, this structure can effectively disperse the wind pressure, reduce the structural fatigue of the blade, avoid damage caused by extreme wind loads, and extend its service life.

[0025] Generally speaking, the present invention has achieved a breakthrough in structural innovation and wind energy utilization mechanism. Through the combination of an integrated blade structure, a lateral wind energy capture mechanism and a bidirectional rotation mechanism, the wind energy utilization efficiency has been significantly improved, the operation stability of the wind turbine has been optimized, and the economy and sustainability of the wind turbine blade have been improved, providing a new solution for the further development of wind energy power generation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the drawings and embodiments.

[0027] Figure 1 is the overall front view effect diagram of the present invention;

[0028] Figure 2 Schematic diagram showing the side view structure of the present invention;

[0029] Figure 3 Schematic diagram showing the operating path of the forward and reverse rotation mechanism of the present invention;

[0030] Figure 4 Schematic diagram showing the internal structure of the present invention in the front view state;

[0031] Figure 5 Schematic diagram showing the wind wheel structure of the present invention;

[0032] Figure 6 Schematic diagram showing a partial view of the blade wing and the air guide plate of the present invention.

[0033] Explanation of reference numerals:

[0034] Frame 11

[0035] Cylinder frame 12

[0036] Cable 111

[0037] Arch frame 112

[0038] Ring frame 113

[0039] Main frame 114

[0040] Support frame 115

[0041] Outer wheel frame 116

[0042] Air guide plate 117

[0043] Skin 118

[0044] Solid shaft rod 121

[0045] Flange cover plate 122

[0046] Impeller 21

[0047] Shaft gear 22

[0048] Operating path 31 of the forward rotation mechanism

[0049] Operating path 32 of the reverse rotation mechanism Detailed implementation manners

[0050] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The relative positional or coordinate directions mentioned in the text are only used for the explanation of the present invention. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are only examples of devices or methods consistent with some aspects of the present application detailed in the appended claims.

[0051] The one-piece wind turbine blade device for bidirectional rotation and efficient wind energy capture of the present invention belongs to the category of the mainstream three-blade in the current wind turbine blade market and belongs to the horizontal-axis wind power generation blade.

[0052] The one-piece wind turbine blade device for bidirectional rotation and efficient wind energy capture has a front view structure of three triangular one-piece blades with the blade tips facing outward, and a side view structure of a diversion air duct with a certain three-dimensional framework and having a wind guiding function; the external visible contour and / or structure of the device is a forward rotation mechanism, and a reverse rotation mechanism is arranged inside its contour and / or structure; the forward rotation mechanism rotates forward under the direct blowing of natural wind, and the diversion air duct of the side view structure converges the cyclone formed by the blade angles under the action of the cyclone to drive the reverse rotation mechanism arranged inside to operate cyclically; the forward rotation mechanism and the reverse rotation mechanism, that is, the device, both belong to rotating components or rotating accessories; the forward rotation mechanism is adapted to be fixedly connected to the rotor of the wind turbine nacelle, and the reverse rotation mechanism is adapted to be rotationally connected to the rotor of an additional motor inside the wind turbine nacelle.

[0053] Specifically, the one-piece wind turbine blade device for bidirectional rotation and efficient wind energy capture provided by the present invention is applicable to the existing rotor of the wind turbine nacelle or used to replace the blades of the traditional three-blade fan to improve the wind energy utilization rate and operation stability. By Figure 1 、 Figure 2 It can be seen that its overall structure adopts an integrated triangular blade design and adds a diversion air duct structure for lateral wind energy to realize the synergistic effect of forward wind energy and lateral wind energy, thereby improving the power generation efficiency, enhancing the safety of the blade structure, and extending its service life.

[0054] Furthermore, the device mainly includes two parts, a forward rotation mechanism and a reverse rotation mechanism, and its operation path is Figure 3Schematic diagram of the rotation paths 31 of the forward rotation mechanism and 32 of the reverse rotation mechanism shown. The forward rotation mechanism and the reverse rotation mechanism, i.e., this device, both belong to rotating components or rotating accessories. The forward rotation mechanism is adapted to be fixedly connected to the rotor of the wind turbine nacelle, and the reverse rotation mechanism is adapted to be rotationally connected to the rotor of an additional motor inside the wind turbine nacelle. The forward rotation mechanism and the reverse rotation mechanism are both two separately operating components and an integral system device.

[0055] Among them, the outer shape of the forward rotation mechanism is approximately an equilateral triangle, with three leaf tips facing outwards. The outer contour of the triangle has a certain concave arc, and the value of its concave arc can be specifically determined according to the regional wind energy resources. Please refer to Figure 2 、 Figure 4 for understanding. The forward rotation mechanism consists of parts such as a frame body 11, a cylinder frame 12, leaf wings 13, and a wind guiding plate 117, etc. It can be seen from Figure 6 that one end of the side of the blade of the frame body 11 is in a thick and wide air intake open state, and the part where the other end of the side is transitionally connected to the leaf wing 13 is in a narrow and small constricted opening closed state, thus forming an internal air duct structure. The frame body 11 serves as the skeleton of the entire device, and its structural stability plays a decisive role in the operation of the device. Preferably, high-strength aluminum alloy material is used, and it can also be alternatively made of thick-walled stainless steel or lightweight steel pipes, and its stress structure is optimized through finite element analysis so that it can withstand the dynamic loads in a strong wind environment.

[0056] Furthermore, a plurality of components such as cable stays 111, arch frames 112, ring frames 113, main frames 114, support frames 115, and outer wheel frames 116 are arranged inside the frame body 11. The components are connected by high-strength rivets and welding methods to ensure the stability and durability of the overall structure.

[0057] Even further, there are three cable stays 111. Preferably, high-strength carbon fiber materials or high-strength steel cables are used to improve the tensile strength, ensure that the blades can maintain a stable shape during rotation, and prevent breakage caused by excessive dynamic deformation or vibration due to wind load effects. As shown in Figure 2 , one end of the cable stays 111 is commonly connected to the top of the center of the frame body 11, and the other ends are respectively connected to the three leaf tips of the frame body 11. The connection method is a flexible connection, and auxiliary measures such as turnbuckles, wire pullers, and thimbles can be used. After tying, it shows a triangular posture.

[0058] The arch frame 112 is arc-shaped with the radian facing inwards. Its material form is a circular pipe and there are no less than 3 of them. The ring frame 113 is a circular pipe frame, arranged in the middle of the frame body 11 parallel to the thickness of the frame body 11, and around the outer ring of the reverse rotation mechanism. The arch frame 112 is fixedly connected to the ring frame 113, and the connection part adopts a reinforcement plate structure to enhance the torsional resistance. And its curvature is optimized through finite element simulation, so that when the air flow passes through this area, the eddy current loss can be effectively reduced and the wind energy capture ability can be improved. The main frame 114 is composed of three circular straight pipes, arranged in the middle of the three blades. One end of the main frame 114 is fixedly connected to the ring frame 113, and the other ends are respectively fixedly connected to the tips of the three blades of the frame body 11. The support frame 115 includes two types. The first type of support frame is fixedly arranged on one side of the main frame 114 and their lengths are different. Their number is determined according to the blade size and they are arranged in an orderly manner. The second type of support frame is arranged on the side of the frame body 11. The first type of support frame and the second type of support frame are arranged correspondingly but their numbers are different. The outer wheel frame 116 is the triangular outer frame structure of the frame body 11. This structure is a three-dimensional structure composed of two side frames and many supports and has a certain inward concave radian on the side. The second type of support frame is fixedly connected to the supports of the outer wheel frame 116.

[0059] Furthermore, as Figure 1 shown, the skin 118 is used as the outer covering material of the blade and the frame body 11, mainly arranged on the tips of the three blades, the three blade wings 13, the front and back surfaces of the frame body 11, and the tip parts on the side of the frame body 11. Its main function is to optimize the aerodynamic characteristics and at the same time provide a certain degree of protection to prevent the internal structure from being eroded by environmental factors. The skin 118 is made of carbon fiber composite material or light metal material, and combined with the vacuum infusion molding process and painting process to make its surface smooth and have excellent weather resistance. The skin 118 is measured and customized according to the specific shape of the actual structure, manufactured and assembled by multiple molds, and fixedly connected to the frame body 11 through high-strength adhesives. At the same time, the connection is strengthened by rivets or hemming and rolling in the edge area to ensure that it will not fall off or be damaged due to vibration or centrifugal force in the high-speed rotation environment.

[0060] Preferably, the cylinder frame 12 is an important support structure of the forward rotation mechanism. Its design needs to ensure the adaptability to most wind turbine nacelles, so a standard flange structure is adopted to accurately dock with the wind turbine rotor flange; Please refer to Figure 5As shown, the cylinder frame 12 is made of high-strength thick-walled steel. There is a thickened flange cover plate 122 at its upper end. There is an external thread screw tube at the bottom of the flange cover plate 122, and a central reserved hole. At the central position of the upper end of the flange cover plate 122, a solid shaft rod 121 is installed. The shaft rod 121 is made of high-strength alloy steel and its wear resistance and anti-fatigue ability are improved through heat treatment process to ensure that it is not easily worn or broken during long-term operation; the solid shaft rod 121 penetrates through the flange cover plate 122 and is fixedly connected to the head at the bottom of the cylinder frame 12. The head is manufactured by an integrated casting process to ensure no defects inside it, so as to improve the overall bearing capacity.

[0061] Preferably, the structural design of the blade wing 13 is crucial for wind energy guiding and improving wind energy utilization rate. It adopts an approximate arc-edge triangular three-dimensional structure; there are three blade wings 13 in total in this device, which are respectively installed on the side of each blade and near the blade tip, and are fixed on the frame body 11 by bolts and connecting plates and kept flush with the front of the frame body 11. The connecting plates are made of high-strength aluminum alloy material and are anodized to improve corrosion resistance and mechanical strength; there is a reinforcing rib structure at the connection between the blade wing 13 and the frame body 11. The function of this structure is to disperse the load, improve the stability of the blade wing 13 under high-speed rotation, and prevent damage caused by stress concentration; one of the angles of the blade wing 13 is a long arc angle, and the installation direction of this long arc angle points inward to optimize the air flow guidance, make the wind energy entering the air duct more uniform, and reduce the turbulent flow loss; the blade wing 13 is made of carbon fiber reinforced composite material to reduce the overall mass and improve the anti-fatigue performance at the same time.

[0062] Preferably, according to Figure 4 、 Figure 6 it can be known that the air deflector 117 is arranged inside the frame body 11, and its function is to optimize the air flow path and improve the wind energy utilization rate; the air deflector 117 is composed of a large arc panel and a small arc panel. The large arc panel is installed in the middle of the blade near the main frame 114, and its arc faces the main frame 114. One end of the small arc panel is installed at one angle of the blade wing 13, and the other end is installed at a position near the ring frame 113, and its arc faces the opposite direction of the large arc panel; the large arc panel is responsible for guiding the wind energy into the diversion air duct, while the small arc panel is used for further rectification to form an air flow diversion air duct, so that the air flow enters the reverse rotation mechanism more smoothly and concentratedly; the air deflector 117 is made of glass fiber reinforced plastic material, and its curvature accuracy is ensured through numerical control forming process, so as to optimize the aerodynamic characteristics; the installation method of the air deflector 117 is fixed by riveting and gluing to ensure its stability in high wind speed environment and reduce the risk of structural loosening caused by vibration at the same time.

[0063] Specifically, the reverse rotation mechanism can be referred to Figure 5 as shown, which includes an impeller 21 and a shaft gear 22. The shaft gear 22 consists of two parts, specifically, it is integrally formed by the external gear of the lower part and the sleeve of the upper part. It is made of high-strength alloy steel and undergoes carburizing and quenching treatment to improve its wear resistance and impact resistance. The inner diameter of the shaft gear 22 is rotationally connected to the outer diameter of the barrel frame 12. Therefore, high-precision machining technology is adopted, and wear-resistant bearings are added at the connection part to reduce friction loss and improve transmission efficiency. The impeller 21 is made of lightweight wear-resistant material and is fixedly installed around the outer diameter of the sleeve of the upper part. The design of the impeller 21 needs to ensure efficient operation under the action of the cyclone. Therefore, the blade angle is optimized, and computational fluid dynamics (CFD) simulation is used to analyze its force characteristics to reduce energy loss and improve cyclone driving efficiency. The shape and the number of blades are not limited in the present invention. The outer diameter dimension of the impeller 21 < the inner diameter dimension of the ring frame 113, and the height of the impeller 21 < the thickness of the frame body 11.

[0064] It can be understood that the working principle of this device is mainly based on the synergistic effect of the forward rotation mechanism and the reverse rotation mechanism. Under the action of natural wind force, the forward rotation mechanism rotates, driving the operation of the wind turbine rotor. At the same time, due to the air flow characteristics between the blades, a cyclone will form in the blade angle area. After this cyclone enters the diversion air duct, it acts on the reverse rotation mechanism, causing the impeller 21 and the shaft gear 22 to rotate, thereby further improving the wind energy utilization rate; as Figure 3 shown, the rotation path 31 of the forward rotation mechanism interacts with the rotation path 32 of the reverse rotation mechanism to form a sustainable air flow circulation mode, enabling the wind energy to be fully captured and converted into mechanical energy through a reasonable transmission structure, ultimately improving the overall power generation efficiency.

[0065] The specific embodiments of the present invention have been described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to this invention are also within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. The integrated wind turbine blade device with bidirectional rotation and high efficiency wind energy capture is a three-blade horizontal axis wind turbine blade, characterized by: The front view of the device comprises three triangular integrated blades with the blade tips facing outwards. In the side view, the side of each single blade is a three-dimensional open air inlet frame. A wind deflector is provided between the windward side of the air inlet frame and the center of the device. Wind energy is collected through the air inlet frame and flows into the air deflector through the air deflector to form a guide air duct. The externally visible profile and / or structure of the device is a forward rotation mechanism, and a reverse rotation mechanism is provided inside its profile and / or structure; The forward rotating mechanism rotates forward under the direct blowing of natural wind, and the guide air duct of the side view structure, under the action of the cyclone, converges the cyclone formed by the blade angle and drives the reverse rotating mechanism arranged inside to circulate; The forward rotation mechanism and the reverse rotation mechanism are both rotating components or rotating accessories; The forward rotation mechanism is adapted to be fixedly connected to the rotor of the wind turbine nacelle, and the reverse rotation mechanism is adapted to be rotationally connected to the rotor of the additional motor inside the nacelle of the wind turbine.

2. The bidirectional rotating, high-efficiency wind energy capture integrated wind turbine blade device according to claim 1, characterized in that: The forward rotation mechanism includes a frame (11); the frame (11) is triangular in shape and consists of a cable (111), an arch frame (112), a ring frame (113), a main frame (114), a support frame (115), an outer wheel frame (116), a wind deflector (117) and a skin (118); The skin (118) wraps the frame (11), and there are three cables (111) flexibly connected to three blade tips of the frame (11) respectively; The arch frame (112) is arranged on the upper part of the reverse rotation mechanism, and the ring frame (113) is arranged around the reverse rotation mechanism; The main frame (114) is connected to the arch frame (112) and the ring frame (113), and the support frame (115) is connected to the main frame (114) and the outer wheel frame (116); The air guide plate (117) is an arc-shaped panel, consisting of a large arc panel and a small arc panel.

3. The bidirectional rotating, high-efficiency wind energy capture integrated wind turbine blade device according to claim 1, characterized in that: The forward rotation mechanism further comprises a drum rack (12), the drum rack (12) being a tube structure, a flange cover plate (122) being provided at the upper end of the drum rack (12), a solid shaft rod (121) being provided at the upper end of the flange cover plate (122), the solid shaft rod (121) passing through the flange cover plate (122) and being fixedly connected to a head at the bottom of the drum rack (12).

4. The bidirectional rotating, high-efficiency wind energy capture integrated wind turbine blade device according to claim 1, characterized in that: The forward rotation mechanism further comprises three blade wings (13), the blade wings (13) being triangular in shape, one of which is a long arc angle, the blade wings (13) being arranged at a side position close to the blade tip, and the installation direction of the long arc angle is inward.

5. The bidirectional rotating, high-efficiency wind energy capturing integrated wind turbine blade device according to claim 3, characterized in that: The reverse rotation mechanism is composed of an impeller (21) and a shaft gear (22); The shaft gear (22) comprises two parts: a lower external gear and an upper sleeve; the sleeve is arranged at the bottom of the flange cover (122) and is rotatably connected to the cartridge frame (12); The impeller (21) is fixedly arranged around the outer diameter of the casing, and the shaft gear (22) is rotationally connected to the cylinder frame (12).

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