Multi-blade flag wind power generation device based on Archimedes spiral structure

Abstract

The invention discloses a multi-blade flag wind power generation device based on an Archimedes spiral structure, and relates to the technical field of wind power generation, the multi-blade flag wind power generation device comprises an Archimedes spiral framework, a flexible fabric TENG flag and a TENG friction air channel, the TENG friction air channel is installed on the Archimedes spiral framework, and the Archimedes spiral framework penetrates through the TENG friction air channel; the flexible fabric TENG flag is installed on the edge of the Archimedes spiral framework, and the outer edge of the flexible fabric TENG flag is in sliding connection with the inner wall of the TENG friction air duct. According to the multi-blade flag wind power generation device based on the Archimedes spiral structure, the spiral geometry continuous curved surface design reduces the starting wind speed threshold value, wind energy can be efficiently converted into rotating motion, the energy conversion efficiency is improved, stable energy output is ensured, the wind capturing capacity of the device is enhanced, the energy capturing density is improved, and the wind power generation efficiency is improved. The flexible design of the flag can adaptively deform along with the wind speed, strong wind damage is avoided, and the durability and the long-term running stability of the device are improved.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and in particular to a multi-bladed flag wind power generation device based on an Archimedes spiral structure. Background Technology

[0002] With global population growth and accelerated industrialization, the consumption of traditional fossil fuels is increasing, exacerbating the energy crisis, causing severe environmental pollution, and highlighting ecological problems such as global climate change. Developing and utilizing new energy sources has become an urgent global task to achieve sustainable development for human society. Wind energy, a form of solar energy conversion, is inexhaustible. As a clean, renewable, and pollution-free form of green energy, wind power generation has attracted widespread attention worldwide. With the rapid development of mobile electronic devices and the Internet of Things, it is necessary to develop new design strategies and technologies to achieve efficient wind energy harvesting.

[0003] Triboelectric nanogenerators (TENGs) offer advantages such as simple fabrication and a wide range of material choices; they are lightweight, highly efficient, and flexible in structural design; and they have significant advantages in fields such as micro-wind harvesting and smart city construction. Therefore, developing simple, efficient, and multifunctional structures is crucial for promoting the practical application of TENGs in wind power generation.

[0004] The Archimedes spiral fan blade structure, designed using biomimicry, features low mechanical resistance, a large wind-receiving area, high rotational speed, and low starting wind speed. When the spiral rotor is enclosed in a duct, it can attract more airflow into the duct, promoting air circulation. The narrow gap between the blades and the duct reduces energy waste and noise emissions. Therefore, it holds promise for applications in triboelectric nanogenerators for micro-wind collection and airflow promotion.

[0005] Current mainstream wind power generation equipment is mainly based on electromagnetic effects and adopts turbine design. Wind energy collectors are large in size, complex in structure, require high operating wind speeds, have high maintenance costs and high noise. They are mainly used for energy supply of large-scale power grids. In urban wind energy applications, they cannot achieve a two-way match between energy output and cost. Moreover, they have high site requirements and can only be installed in remote areas far away from cities and buildings. They are not suitable for powering portable electronic devices and widely distributed sensor networks.

[0006] Triboelectric nanogenerators offer a promising solution for wind energy harvesting, particularly in low-wind-speed, distributed, and small-scale applications. They offer significant advantages in ultra-low wind-speed start-up capability, material structural flexibility, low cost, and environmental adaptability. The rotating triboelectric nanogenerator, in particular, employs a core-shell structure, generating charge transfer through coaxial rotation and utilizing polymers to enhance the charge transfer process, thereby increasing power density. This design enables the rotating triboelectric nanogenerator to effectively harvest mechanical energy from rotational motion, demonstrating its high energy conversion efficiency and practicality.

[0007] Shun Yong et al. proposed a multi-stage automatic switching energy harvesting device (see doi10.1002 / aenm.202101194), a high-efficiency wide-band wind energy harvesting system based on a dual-rotating-axis TENG (D-TENG). This system assembles energy harvesting modules with different structural parameters into a single unit, achieving high-efficiency power output at different wind speeds; however, the structure is more complex. Jianxiong Zhao et al. designed and fabricated a triboelectric-electromagnetic hybrid nanogenerator (TEHG) using a combination of a rotating TENG and an EMG to harvest wind energy generated in the environment. However, this system is complex, and the effect of increasing wind speed is no longer significant after the voltage increases to 171V, resulting in limited output voltage (see doi10.1002 / admt.202001022). RenX et al. designed a coaxial rotating wind turbine generator (TENG) with an independent friction layer mode. The device consists of a cylindrical stator fixed on a support and a hollow rotor connected to the fan blades. However, it has a high start-up wind speed and operates at 2.5 m / s (see doi10.1016 / j.nanoen.2018.06.002).

[0008] How to design a multi-bladed flag wind power generation device based on the Archimedes spiral structure, and develop a simple, efficient energy conversion, high stability, and low starting wind speed structure through biomimetic structural optimization and advanced material technology, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] The purpose of this invention is to provide a multi-bladed flag wind power generation device based on an Archimedes spiral structure, which solves the problems listed in the background art.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0011] The present invention discloses a multi-bladed flag wind power generation device based on an Archimedes spiral structure, comprising an Archimedes spiral frame, a flexible fabric TENG flag, and a TENG friction duct. The TENG friction duct is installed on the Archimedes spiral frame, and the Archimedes spiral frame passes through the TENG friction duct.

[0012] The flexible fabric TENG flag is installed on the edge of the Archimedes spiral skeleton, and the outer edge of the flexible fabric TENG flag is slidably connected to the inner wall of the TENG friction air duct.

[0013] Preferably, the Archimedes spiral skeleton includes two U-shaped fixing frames, a telescopic bracket is installed on the upper surface of the U-shaped fixing frame, and a bearing is installed on the free end of the telescopic bracket;

[0014] A rotating bearing rod is rotatably mounted between the bearings. Limiting rings are installed opposite each other on the outer shaft surfaces of both ends of the rotating bearing rod. A through shaft is fitted on the middle outer shaft surface of the rotating bearing rod. An Archimedes spiral fan blade is installed on the outer circumferential surface of the through shaft.

[0015] An extension platform is installed at the outer edge of the tip of the Archimedes spiral fan blade.

[0016] Preferably, the Archimedes spiral fan blade, the extension platform, and the through shaft are integrally formed.

[0017] Preferably, the Archimedes spiral fan blades, the extension platform, and the through shaft are made of polymer, wood, or fiber products.

[0018] Preferably, the rotating support bar is made of composite material, metal material, ceramic material, wood or polymer material.

[0019] Preferably, a female buckle is fixedly installed on one side of the flexible fabric TENG flag by mechanical fasteners or magnetic attachments, and a male buckle is installed on the outside of the extension platform. The flexible fabric TENG flag and the extension platform are interlocked by the female buckle and the male buckle.

[0020] Preferably, the TENG friction air duct includes an air duct shell, fan ring positive electrode plates are installed at equal intervals on the inner side wall of the air duct shell, and the outer side wall of the air duct shell is mounted on the U-shaped fixing frame.

[0021] Preferably, the installation spacing of the fan ring positive electrode is not greater than the contact width between the flexible fabric TENG flag and the fan ring positive electrode.

[0022] Preferably, it also includes a first wire group and a second wire group, with adjacent sector ring positive electrode plates connected by the first wire group and the second wire group respectively, and the first wire group and the second wire group respectively serving as positive and negative electrodes connected to an electrical testing instrument.

[0023] Preferably, the opening on the side of the duct housing near the tip of the Archimedes fan blade is an air inlet, and the opening on the other side of the duct housing is an air outlet, with the air inlet and the air outlet corresponding to each other.

[0024] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0025] This invention discloses a multi-bladed flag wind power generation device based on the Archimedes spiral structure. Through biomimetic structural optimization and advanced material technology, it develops a structure that is simple in design, has high energy conversion efficiency, high stability, and low starting wind speed. This promotes the development of clean energy towards distributed and inclusive directions, and ultimately provides sustainable energy solutions for emerging fields such as smart cities, power supply in remote areas, and green Internet of Things.

[0026] Improving wind power generation efficiency: Traditional fan-blade wind turbines suffer significant energy losses during wind energy conversion, typically achieving a conversion rate of only 25% to 50%. However, wind power generation devices based on the Archimedes' helix structure, through their unique helical blade design, can more effectively capture and utilize wind energy, thereby increasing the power conversion rate to approximately 80%. This high conversion rate allows the device to generate more electricity under the same wind conditions, improving the overall efficiency of wind power generation.

[0027] Noise Reduction: Traditional wind turbines often generate significant noise during operation, which not only disturbs the surrounding environment but may also affect people's living comfort. However, wind power generation devices based on the Archimedes spiral structure can significantly reduce the noise level during wind power generation due to their unique structure and working principle, thereby reducing the negative impact on the environment.

[0028] The flag's flexible structure allows for the collection of light winds: the fiber structure flag offers a wide range of material choices, flexible manufacturing methods, excellent air and moisture permeability, shape adaptability, and a larger contact area provided by the fiber surface. While traditional fan-type wind turbines start generating electricity at wind speeds between 6 and 9 m / s, this device can output electricity at only 1.4 m / s.

[0029] In summary, this invention lowers the starting wind speed threshold through a continuous curved surface design with spiral geometry, enabling it to operate efficiently even in light wind conditions. The rotating TENG structure and Archimedes' spiral design efficiently convert wind energy into rotational motion, improving energy conversion efficiency and ensuring stable energy output. Furthermore, the multi-leaf flag design increases the contact area with the wind, enhancing the device's wind-catching ability and increasing energy capture density. The flag's flexible design adapts to wind speed, preventing damage from strong winds. The rotating TENG structure also reduces mechanical wear, improving the device's durability and long-term operational stability. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] Figure 1 This is a three-dimensional schematic diagram of a multi-bladed flag wind power generation device based on an Archimedes spiral structure according to the present invention;

[0032] Figure 2 This is a three-dimensional schematic diagram of the Archimedes spiral skeleton of the present invention;

[0033] Figure 3 This is a three-dimensional schematic diagram of the TENG friction air duct of the present invention;

[0034] Figure 4 This is a schematic diagram showing the connection between the extension platform of the present invention and the flexible fabric TENG flag;

[0035] Figure 5 This is a schematic diagram of the working mode of Embodiment 1 of the present invention;

[0036] Figure 6 This is a voltage output performance diagram of the device within 100 seconds at a wind speed of 1.42 m / s, according to Embodiment 1 of the present invention.

[0037] Explanation of reference numerals in the attached drawings: 1. Archimedes spiral frame; 101. Bearing; 102. Telescopic bracket; 103. Through shaft; 104. Extension platform; 105. Archimedes spiral fan blade; 106. Rotating load-bearing bar; 107. Limiting ring; 108. U-shaped fixing frame; 2. Flexible fabric TENG flag; 3. TENG friction air duct; 301. Fan ring positive electrode plate; 302. Air duct shell; 303. First conductor group; 304. Second conductor group; 4. Air inlet; 5. Air outlet. Detailed Implementation

[0038] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] like Figure 1-4 As shown, a multi-bladed flag wind power generation device based on an Archimedes spiral structure includes an Archimedes spiral frame 1, a flexible fabric TENG flag 2, and a TENG friction duct 3. The TENG friction duct 3 is installed on the Archimedes spiral frame 1, and the Archimedes spiral frame 1 passes through the TENG friction duct 3.

[0040] The flexible fabric TENG flag 2 is installed on the edge of the Archimedes spiral skeleton 1, and the outer edge of the flexible fabric TENG flag 2 is slidably connected to the inner wall of the TENG friction air duct 3.

[0041] The Archimedes spiral structure can smoothly convert linear motion (such as wind kinetic energy) into rotational motion while reducing turbulence and energy loss. The continuous curved surface design of the spiral geometry lowers the start-up wind speed threshold, enabling efficient operation even at low wind speeds. The device integrates a TENG module, which uses the rotation of the spiral structure to drive the fabric to periodically contact and separate from the friction layer, converting mechanical energy into electrical energy.

[0042] It combines bionics, triboelectric nanogenerator technology and wind energy capture in an innovative design. Through its unique geometry and material properties, it converts wind energy into rotational motion, achieving efficient and stable energy production. It is especially suitable for low wind speed, multi-wind direction or miniaturized application scenarios, and is crucial for promoting the practical application of wind power generation (TENG).

[0043] Specifically, the Archimedes spiral skeleton 1 includes two U-shaped fixing frames 108. A telescopic bracket 102 is installed on the upper surface of the U-shaped part of the U-shaped fixing frame 108. The telescopic bracket can be adjusted up and down to control the position of the Archimedes spiral skeleton. A bearing 101 is installed on the free end of the telescopic bracket 102 to bear the rotational movement of the entire skeleton.

[0044] A rotating bearing 106 is rotatably mounted between the bearings 101. Limiting rings 107 are installed opposite each other on the outer shaft surfaces at both ends of the rotating bearing 106. The limiting ring is composed of two upper and lower half rings and has screw holes on both sides. By adjusting the depth of the screws, the radius and tightness of the limiting ring are controlled. The limiting ring restricts the position of the through shaft on the rotating bearing.

[0045] A hollow cylindrical through shaft 103 is fastened and fitted onto the outer central shaft surface of the rotating support rod 106. One to ninety-nine Archimedes spiral fan blades 105 are installed on the outer circumferential surface of the through shaft 103 and are wound around each other at equal intervals to form a complete loop, forming a conical spiral multi-stage wind-catching unit. This increases the contact area with the wind, enhances the wind-catching ability of the device, and improves the energy capture density. The flexible design of the flag can adapt to the wind speed and deform accordingly, avoiding damage from strong winds.

[0046] An extension platform 104 is installed at the outer edge of the tip of the Archimedes spiral fan blade 105.

[0047] Specifically, the Archimedes spiral fan blade 105, the extension platform 104, and the through shaft 103 are integrally formed using hot pressing, molding, bending extrusion, and 3D printing technologies.

[0048] Specifically, the Archimedes spiral fan blade 105, the extension platform 104, and the through shaft 103 are made of polymers such as polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, polycarbonate, polyimide, polytetrafluoroethylene, ultra-high molecular weight polyethylene, nylon, polyetheretherketone, and resins; wood such as fiberboard, particleboard, and plywood; and fiber products such as glass fiber reinforced plastics and carbon fiber reinforced plastics.

[0049] Specifically, the rotating support bar 106 is made of composite materials such as carbon fiber reinforced polymer (CFRP) and glass fiber reinforced plastic (GFRP), metal materials such as stainless steel / low carbon steel, titanium, magnesium, cast iron, alloy steel, gold, copper, lead, etc., ceramic materials such as alumina, zirconium oxide, silicon carbide, etc., wood such as oak, pine, etc., and polymer materials such as urea-formaldehyde resin, ABS, polyethylene terephthalate, polymethyl methacrylate, polystyrene, polypropylene, etc.

[0050] Specifically, a female buckle is fixedly installed on one side of the flexible fabric TENG flag 2 by mechanical fasteners or magnetic attachments, and a male buckle is installed on the outer cross-section of the extension platform 104. The flexible fabric TENG flag 2 and the extension platform 104 are interlocked by the female buckle and the male buckle. Furthermore, hook-type cantilever buckles, sleeve-type cantilever buckles, U-shaped buckles, insert buckles, and ball-type buckles can be used to facilitate quick disassembly and replacement of flags with different material structures. At the same time, the flag can be semi-circular, trapezoidal, long strip, triangular, teardrop, etc., with a thickness of 0.01-20mm. It can be made of natural fibers, artificial fibers, and other fiber materials, and is prepared into fabric through two-dimensional or three-dimensional weaving, knitting, warp knitting, non-woven, and other weaving technologies. The fabric structure can be plain weave, twill weave, satin weave, weft plain weave, double rib weave, mesh weave, non-woven, and the yarn is S-shaped sewn together, which makes the materials, sizes and shapes of the flexible fabric TENG flags widely selectable and the preparation methods flexible. The fabric can be composed of different weave structures with different densities and structures, which is flexible in structure, achieves high-efficiency power output, low initial wind speed, and diverse application scenarios. In addition, the rotating TENG structure reduces mechanical wear and improves the durability and long-term operation stability of the device.

[0051] During operation, the flexible fabric TENG flag serves as the negative electrode friction layer. Under the action of air, the Archimedes spiral skeleton converts the streamline momentum of the air into angular momentum, causing the flexible fabric TENG flag to rotate. The fabric is soft and long, and under the action of centrifugal force, it comes into contact with and adheres to the positive electrode plate of the fan ring on the TENG friction air duct, and then separates, generating charge transfer and thus generating current.

[0052] Specifically, the TENG friction air duct 3 includes an air duct shell 302, on which fan ring positive electrode plates 301 are installed at equal intervals on the inner sidewall of the air duct shell 302, and on the outer sidewall of the air duct shell 302 is installed on the U-shaped fixing frame 108; the installation spacing of the fan ring positive electrode plates 301 is not greater than the contact width between the flexible fabric TENG flag 2 and the fan ring positive electrode plates 301, and also includes a first wire group 303 and a second wire group 304, adjacent fan ring positive electrode plates 301 are connected by the first wire group 303 and the second wire group 304 respectively, and fan ring positive electrode plates with a gap are connected to the same set of wires, and the first wire group 303 and the second wire group 304 are respectively connected to the electrical testing instrument as positive and negative electrodes;

[0053] Furthermore, the outer shell of the duct can be made of materials such as polypropylene, polyethylene, polyvinyl chloride, resin, and fiber-reinforced composite materials. The shape can be cylindrical, Venturi tube, conical, etc. Different shapes can change the initial wind speed passing through the Archimedes spiral structure, adapting to wind energy collection and energy conversion under different wind speeds. The two sets of positive electrode plates attached to the inner wall alternately improve energy output efficiency. The length of the positive electrode plate of the fan ring is not greater than the length of the outer shell of the duct, and it can be made of materials such as aluminum, steel, copper, nickel, silver, or alloys.

[0054] Specifically, the opening on the side of the air duct housing 302 near the tip of the Archimedes spiral fan blade 105 is the air inlet 4, and the opening on the other side of the air duct housing 302 is the air outlet 5, with the air inlet 4 and the air outlet 5 corresponding to each other.

[0055] Example 1

[0056] like Figure 5 As shown, the outer shell of the TENG friction air duct is made of polyvinyl chloride, with a diameter of 100mm, a thickness of 1.8mm, and a length of 200mm. The positive electrode of the fan ring consists of 6 identical copper foils, with dimensions of 100×48×0.05mm. The spacing between adjacent positive electrode plates of the fan ring is 4mm, and they are tightly attached to the inner wall of the friction air duct using ultrasonic welding.

[0057] The flexible fabric TENG flag uses three identical strips of warp-knitted PTFE mesh fabric, each measuring 150×6×1mm, and is secured to a female buckle with bolts.

[0058] The Archimedes spiral frame, including the Archimedes spiral blades, extension platform, and through shaft, is integrally molded from epoxy resin. The overall dimensions of the frame are 150×80×76mm. It features three spiral blades, a 100mm long, 6mm diameter, and 2mm thick through shaft, and an approximately triangular extension platform with a maximum width of 6mm. A U-shaped buckle connects the extension platform to the flexible fabric TENG flag. The rotating support rod is a 4mm diameter, 200mm long steel bar. At both ends of the steel bar are vertically extending brackets with rollers and a height of 50mm, used to secure the Archimedes spiral frame in the center of the TENG friction duct.

[0059] like Figure 6 As shown, at a wind speed of 1.42 m / s, the maximum output voltage can reach 190V, the maximum power is 0.35mW, and it maintains stable output performance for nearly 30,000 cycles.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0061] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A multi-bladed flag wind power generation device based on an Archimedes spiral structure, characterized in that: It includes an Archimedes spiral frame (1), a flexible fabric TENG flag (2), and a TENG friction air duct (3), wherein the TENG friction air duct (3) is installed on the Archimedes spiral frame (1), and the Archimedes spiral frame (1) passes through the TENG friction air duct (3); The flexible fabric TENG flag (2) is installed on the edge of the Archimedes spiral skeleton (1), and the outer edge of the flexible fabric TENG flag (2) is slidably connected to the inner wall of the TENG friction air duct (3).

2. The multi-bladed flag wind power generation device based on an Archimedes spiral structure according to claim 1, characterized in that: The Archimedes spiral skeleton (1) includes two U-shaped fixing frames (108), and a telescopic bracket (102) is installed on the upper surface of the U-shaped fixing frame (108). A bearing (101) is installed on the free end of the telescopic bracket (102). A rotating bearing rod (106) is rotatably mounted between the bearings (101). Limiting rings (107) are installed opposite each other on the outer shaft surfaces at both ends of the rotating bearing rod (106). A through shaft (103) is fitted on the outer shaft surface in the middle of the rotating bearing rod (106). An Archimedes spiral fan blade (105) is installed on the outer circumferential surface of the through shaft (103). An extension platform (104) is installed at the outer edge of the tip of the Archimedes spiral fan blade (105).

3. The multi-bladed flag wind power generation device based on an Archimedes spiral structure according to claim 2, characterized in that: The Archimedes spiral fan blade (105), the extension platform (104), and the through shaft (103) are integrally formed.

4. A multi-bladed flag wind power generation device based on an Archimedes spiral structure according to claim 3, characterized in that: The Archimedes spiral fan blade (105), the extension platform (104), and the through shaft (103) are made of polymer, wood, or fiber products.

5. A multi-bladed flag wind power generation device based on an Archimedes spiral structure according to claim 4, characterized in that: The rotating support bar (106) is made of composite material, metal material, ceramic material, wood or polymer material.

6. A multi-bladed flag wind power generation device based on an Archimedes spiral structure according to claim 5, characterized in that: The flexible fabric TENG flag (2) is fixedly installed with a female buckle on one side by mechanical fasteners or magnetic attachments, and a male buckle is installed on the outside of the extension platform (104). The flexible fabric TENG flag (2) and the extension platform (104) are interlocked by the female buckle and the male buckle.

7. A multi-bladed flag wind power generation device based on an Archimedes spiral structure according to claim 2, characterized in that: The TENG friction air duct (3) includes an air duct shell (302), on which fan ring positive electrode plates (301) are installed at equal intervals, and on the outer side wall of the air duct shell (302) is mounted on the U-shaped fixing frame (108).

8. A multi-bladed flag wind power generation device based on an Archimedes spiral structure according to claim 7, characterized in that: The installation spacing of the fan ring positive electrode (301) is not greater than the contact width between the flexible fabric TENG flag (2) and the fan ring positive electrode (301).

9. A multi-bladed flag wind power generation device based on an Archimedes spiral structure according to claim 7, characterized in that: It also includes a first wire group (303) and a second wire group (304), with adjacent sector ring positive electrode plates (301) connected by the first wire group (303) and the second wire group (304) respectively. The first wire group (303) and the second wire group (304) are respectively connected to the electrical testing instrument as positive and negative electrodes.

10. A multi-bladed flag wind power generation device based on an Archimedes spiral structure according to claim 7, characterized in that: The air duct housing (302) has an opening on one side near the tip of the Archimedes spiral fan blade (105) as an air inlet (4) and an opening on the other side as an air outlet (5). The air inlet (4) and the air outlet (5) are opposite to each other.

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