A directionally adaptive triboelectric nanogenerator based on vortex-induced vibration

Abstract

The present invention discloses a direction-adaptive friction nanogenerator based on vortex-induced vibration, which relates to the technical field of friction nanogenerators and includes a cylindrical flow-by-flow module, an adaptive steering module, a rotary friction power generation module, and a solid-liquid friction power generation module; the rotary friction power generation module and the solid-liquid friction power generation module are both arranged in the cylindrical flow-by-flow module; and the cylindrical flow-by-flow module is connected to the adaptive steering module. By introducing friction nanogenerator into vortex-induced vibration, low-frequency vortex-induced vibration energy can be converted into electrical energy. A rotary friction nanogenerator and a solid-liquid friction nanogenerator are simultaneously used. In addition, the solid-liquid friction nanogenerator uses multiple friction nanogenerator units in parallel to effectively improve power generation efficiency. The guide disc can adjust the deflection direction of the friction plate, and the optimal deflection angle of the friction plate can be explored to further improve power generation efficiency. The designed L-shaped direction-adaptive cantilever beam can enable the entire device to automatically adjust its direction according to the continuous changes in the direction of the water flow.

Description

Technical Field

[0001] The present invention relates to the technical field of triboelectric nanogenerators, and in particular to a directionally adaptive triboelectric nanogenerator based on vortex-induced vibration. Background Art

[0002] Throughout history, humanity has engaged in a never-ending battle of wits and courage with the ocean. The depths of oceans and rivers hold countless secrets, and these underwater ruins present a formidable challenge for archaeologists. From discovery to location, exploration and detection, excavation, and subsequent conservation, these processes all place extremely high demands on technology. Continuously monitoring these underwater ruins presents significant challenges for sensors and power supply methods. In recent years, the rapid advancement of integrated circuit and MEMS technology has diversified the functionality of some electronic devices while miniaturizing their size and significantly reducing power consumption. However, traditional chemical battery power still cannot meet the requirements of underwater archaeology. Therefore, a more viable solution is to harvest a steady stream of energy from the surrounding environment. Oceans and rivers contain a vast reservoir of blue energy, including ocean current energy, a highly promising form of marine energy.

[0003] The capture of ocean current energy is the process of converting the kinetic energy of water into electrical energy. At low flow rates, vortex-induced vibration (VIV) is a common method for capturing water kinetic energy. This is a typical fluid-structure interaction phenomenon. When a fluid flows through any non-streamlined blunt body, it generates vortices that detach from the surface on both sides of the structure. These vortices, in turn, generate periodic lift and drag forces on the structure, which in turn cause the structure to vibrate periodically. This vibration can cause severe damage to the structure, but from the perspective of energy collection, it provides the conditions for energy collection. VIV converts flow energy into vibration energy, which is then converted into electrical energy.

[0004] There are three main methods for converting vibration energy: piezoelectric, electromagnetic, and triboelectric nanogenerators. Since vortex-induced vibration (VIV) is a low-frequency vibration, piezoelectric and electromagnetic methods are limited due to their limitations. However, triboelectric nanogenerators offer better output performance at low frequencies. Triboelectric nanogenerators, a popular energy harvesting technology in recent years, utilize friction and electrostatic effects to convert mechanical energy into electrical energy, achieving good output performance at low frequencies. Therefore, triboelectric nanogenerators can effectively convert VIV into electrical energy. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a direction-adaptive friction nanogenerator based on vortex-induced vibration, which can effectively solve the problem of collecting ocean current energy under low-speed fluids and provide a solution for long-term monitoring of underwater archaeology.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a direction-adaptive vortex-induced vibration-based friction nanogenerator, which includes a cylindrical flow-by-flow module, an adaptive steering module, a rotational friction power generation module and a solid-liquid friction power generation module; the rotational friction power generation module and the solid-liquid friction power generation module are both arranged in the cylindrical flow-by-flow module, and the rotational friction power generation module is located above the solid-liquid friction power generation module; the bottom of the cylindrical flow-by-flow module is connected to the adaptive steering module.

[0008] Optionally, the adaptive steering module includes a base, a waterproof bearing, a base shaft and a cantilever beam, the waterproof bearing is provided on the base, the inner ring of the waterproof bearing is connected to the base shaft, and the bottom of the cantilever beam is connected to the top of the base shaft.

[0009] Optionally, the cantilever beam is an L-shaped structure; the top of the vertical portion of the cantilever beam is connected to the bottom of the cylindrical flow module, and the bottom of the vertical portion of the cantilever beam is connected to the base shaft.

[0010] Optionally, the cylindrical flow module includes a first shell, a second shell and a cover plate; the first shell is a cylindrical tube without a bottom and a cover, and the second shell is a cylindrical tube with a bottom and no cover; the top of the second shell is connected to the bottom of the first shell, and the cover plate is arranged on the top of the first shell.

[0011] Optionally, the upper end surface of the second shell is provided with a plurality of grooves, and the plurality of grooves are used to fix the solid-liquid friction power generation module.

[0012] Optionally, a through hole is provided in the middle of the cover plate for fixing the rotary friction power generation module.

[0013] Optionally, the rotary friction power generation module includes a hollow tube, a bearing, a counterweight, a rotor substrate, an aluminum sheet, a polyimide film, a stator copper sheet and a stator substrate; the upper part of the hollow tube is connected to the cylindrical flow module; the bottom of the hollow tube is connected to the stator substrate, the top surface of the stator substrate is provided with the stator copper sheet, and the top surface of the stator copper sheet is provided with the polyimide film; the rotor substrate is rotatably mounted on the hollow tube through the bearing, and the bottom surface of the rotor substrate is provided with the aluminum sheet; the rotor substrate and the stator substrate each include at least two blades; the stator copper sheet has the same shape as the stator substrate, and the aluminum sheet has the same shape as the rotor substrate; the counterweight is provided on one of the blades of the rotor substrate.

[0014] Optionally, the stator substrate and the rotor substrate are both made of acrylic.

[0015] Optionally, the solid-liquid friction power generation module includes a guide disc, a carrier plate and a friction plate; the guide disc is provided with a plurality of through-going long holes and a plurality of carrier grooves, the top of the carrier plate is arranged in the carrier groove, and the friction plate is arranged on the carrier plate; at least two bosses are provided around the bottom surface of the guide disc, and the bosses are used to connect with the cylindrical flow module.

[0016] Optionally, the friction plate includes an FEP film and a copper plate; the copper plate is sealed in the FEP film.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] 1. Introducing friction nano-power generation into vortex-induced vibration can convert low-frequency vortex-induced vibration energy into electrical energy. At the same time, a rotary friction nano-generator and a solid-liquid friction nano-generator are used. In addition, the solid-liquid friction nano-generator uses multiple friction nano-power generation units in parallel to effectively improve the power generation efficiency.

[0019] 2. The guide disc can adjust the deflection direction of the friction plate, and the optimal deflection angle of the friction plate can be explored to further improve the power generation efficiency.

[0020] 3. The designed L-shaped direction-adaptive cantilever beam allows the entire device to adjust its direction according to the changing direction of the water flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 The structural diagram of a flow-around cylinder of a directionally adaptive vortex-induced vibration-based triboelectric nanogenerator;

[0023] Figure 2 The structure diagram of a direction-adaptive rotational triboelectric power generation module based on vortex-induced vibration triboelectric nanogenerator;

[0024] Figure 3 The structure diagram of a direction-adaptive solid-liquid friction power generation module based on vortex-induced vibration friction nanogenerator;

[0025] Figure 4 The structure diagram of a direction-adaptive solid-liquid triboelectric generator based on vortex-induced vibration;

[0026] Figure 5The structure diagram of a direction-adaptive module of a vortex-induced vibration-based tribo-nanogenerator.

[0027] Figure 6 A three-dimensional structural diagram of a directionally adaptive vortex-induced vibration-based friction nanogenerator.

[0028] Description of reference numerals: 100, cover plate; 101, first housing; 102, second housing; 103, through hole; 104, groove;

[0029] 201. Hollow tube; 202. Bearing; 203. Counterweight; 204. Rotor base plate; 205. Aluminum sheet; 206. Polyimide film; 207. Stator copper sheet; 208. Stator base plate;

[0030] 301, guide disc; 302, carrier plate; 303, friction plate; 304, boss; 305, long through hole;

[0031] 401, FEP film; 402, copper sheet;

[0032] 501, cantilever beam; 502, base shaft; 503, waterproof bearing;

[0033] 2. Rotating friction power generation module; 5. Deionized water; 10. Base. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] like Figures 1 to 6 As shown, this embodiment provides a direction-adaptive vortex-induced vibration-based friction nanogenerator, including a cylindrical flow-by-flow module, an adaptive steering module, a rotational friction power generation module 2 and a solid-liquid friction power generation module; the rotational friction power generation module 2 and the solid-liquid friction power generation module are both arranged in the cylindrical flow-by-flow module, and the rotational friction power generation module 2 is located above the solid-liquid friction power generation module; the bottom of the cylindrical flow-by-flow module is connected to the adaptive steering module.

[0036] When the fluid flows through this device, the adaptive steering module rotates to a direction parallel to the flow direction under the push of the fluid. At this time, the vibration parallel to the flow direction is negligible. This device can collect the energy of vibration perpendicular to the flow direction through the vibration of the adaptive steering module, and use the rotating friction power generation module 2 and the solid-liquid friction power generation module to generate electricity.

[0037] In this embodiment, the adaptive steering module includes a base 10, on which is mounted a waterproof bearing 503. The inner ring of the waterproof bearing 503 is connected to a base shaft 502. The bottom of a cantilever beam 501 is connected to the top of the base shaft 502. The cantilever beam 501 is L-shaped; the top of the vertical portion of the cantilever beam 501 is connected to the bottom of the cylindrical flow module, and the bottom of the vertical portion of the cantilever beam 501 is connected to the base shaft 502.

[0038] In a more specific embodiment, the top and bottom of the cantilever beam 501 are connected to the cylindrical flow module and the base shaft 502 through angle brackets.

[0039] When the fluid flows through the cantilever beam 501 , since the cantilever beam 501 is an L-shaped plate-like component, the horizontal portion of the cantilever beam 501 will be parallel to the flow direction of the fluid.

[0040] The cylindrical flow module includes a first shell 101, a second shell 102 and a cover plate 100; the first shell 101 is a cylindrical tube without a bottom and a cover, and the second shell 102 is a cylindrical tube with a bottom and no cover; the top of the second shell 102 is connected to the bottom of the first shell 101 by threads, and the cover plate 100 is connected to the top of the first shell 101 by threads.

[0041] The upper end surface of the second shell 102 is provided with a plurality of grooves 104 , and the plurality of grooves 104 are used to fix the solid-liquid friction power generation module.

[0042] A through hole 103 is provided in the middle of the cover plate 100 for fixing the rotating friction power generation module 2 .

[0043] The rotary friction power generation module 2 includes a hollow tube 201, a bearing 202, a counterweight 203, a rotor base plate 204, an aluminum sheet 205, a polyimide film 206, a stator copper sheet 207 and a stator base plate 208; the upper part of the hollow tube 201 passes through the through hole 103 in the middle of the cover plate 100 in the cylindrical flow module, and the hollow tube 201 and the through hole 103 are fixed by an interference fit; the bottom of the hollow tube 201 is connected to the stator base plate 208, and the top surface of the stator base plate 208 is provided with The stator copper sheet 207 has a polyimide film 206 on its top surface. The rotor base plate 204 is rotatably mounted on the hollow tube 201 via a bearing 202. The bottom surface of the rotor base plate 204 has an aluminum sheet 205. Both the rotor base plate 204 and the stator base plate 208 have four blades. The stator copper sheet 207 and the stator base plate 208 have the same shape, and the aluminum sheet 205 has the same shape as the rotor base plate 204. A counterweight 203 is mounted on one blade of the rotor base plate 204. Both the stator base plate 208 and the rotor base plate 204 are made of acrylic. More specifically, the stator copper sheet 207 is attached to the second substrate using double-sided tape, and the polyimide film 206 is attached to the stator copper sheet 207 using conductive double-sided tape. The rotor base plate 204 is also bonded to the aluminum sheet 205 using double-sided tape, and the aluminum sheet 205 needs to be in contact with the polyimide film 206.

[0044] The solid-liquid friction power generation module includes a guide disc 301, a carrier plate 302, and a friction plate 303. The guide disc 301 is provided with multiple long through-holes 305 and five carrier grooves 104. The top of the carrier plate 302 is positioned within the carrier grooves 104, and the friction plate 303 is mounted on the carrier plate 302 and secured with bolts. Two bosses 304 are positioned around the bottom surface of the guide disc 301. These bosses 304 are secured by an interference fit with the grooves 104 at the top of the second housing 102. By matching the bosses 304 with different grooves 104, different deflection angles of the friction plate 303 can be achieved. Through research, the optimal deflection angle can be found to improve power generation efficiency. The friction plate 303 comprises an FEP film 401 and a copper sheet 402; the copper sheet 402 is sealed within the FEP film 401.

[0045] When fluid flows through the entire device, vortex-induced vibration causes the cylindrical flow module to produce periodic vibrations. This vibration includes vibrations perpendicular to the flow direction and vibrations parallel to the flow direction. Due to the action of the direction-adaptive cantilever beam 501, when the fluid flows through the L-shaped cantilever beam 501, it will generate thrust on the horizontal portion below the L-shaped cantilever beam 501. When this thrust overcomes the friction of the waterproof bearing 503 below, the cantilever beam 501 will rotate. The friction of the waterproof bearing 503 is relatively small, so the device can achieve direction adaptation. Due to the action of the cantilever beam 501, the vibration parallel to the flow direction is negligible, and the device only collects energy from vibrations perpendicular to the flow direction.

[0046] Deionized water 5 is contained in the second shell 102. When the cylindrical flow module vibrates, the deionized water 5 will shake with the second shell 102, and the friction plate 303 will be immersed in the deionized water 5. When the deionized water 5 shakes, the deionized water 5 will continuously come into contact and separate from the friction plate 303. Due to the principle of the solid-liquid friction generator, this contact and separation process will generate an electrical signal, and the generated electrical energy will be transmitted to the outside through the wire to power the sensor.

[0047] When the cylindrical flow module vibrates left and right, the rotor plane inside the first shell 101 will tilt. When the horizontal plane tilts, the counterweight 203 on the rotor surface will slide under the action of gravitational potential energy, and the sliding will be converted into rotation under the action of the bearing 202. At the same time, the stator remains stationary, which will cause relative movement between the polyimide film 206 and the surface of the aluminum sheet 205. This relative rotational movement will cause periodic charge separation in the plane, thereby converting the vibration energy into electrical energy.

[0048] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0049] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A direction-adaptive vortex-induced vibration-based triboelectric nanogenerator, characterized in that: It includes a cylindrical flow-by-flow module, an adaptive steering module, a rotary friction power generation module and a solid-liquid friction power generation module; the rotary friction power generation module and the solid-liquid friction power generation module are both arranged in the cylindrical flow-by-flow module, and the rotary friction power generation module is located above the solid-liquid friction power generation module; the bottom of the cylindrical flow-by-flow module is connected to the adaptive steering module; under the push of the fluid, the adaptive steering module rotates to a direction parallel to the flow direction; the energy of vibration perpendicular to the flow direction is collected through the vibration of the adaptive steering module, and the rotary friction power generation module and the solid-liquid friction power generation module are used to generate electricity.

2. The direction-adaptive vortex-induced vibration-based triboelectric nanogenerator according to claim 1, characterized in that: The adaptive steering module includes a base, a waterproof bearing, a base shaft and a cantilever beam. The waterproof bearing is provided on the base, the inner ring of the waterproof bearing is connected to the base shaft, and the bottom of the cantilever beam is connected to the top of the base shaft.

3. The direction-adaptive vortex-induced vibration-based triboelectric nanogenerator according to claim 2, characterized in that: The cantilever beam is an L-shaped structure; the top of the vertical portion of the cantilever beam is connected to the bottom of the cylindrical flow-around module, and the bottom of the vertical portion of the cantilever beam is connected to the base shaft.

4. The direction-adaptive vortex-induced vibration-based triboelectric nanogenerator according to claim 1, characterized in that: The cylindrical flow-around module includes a first shell, a second shell and a cover plate; the first shell is a cylindrical tube without a bottom and a cover, and the second shell is a cylindrical tube with a bottom and no cover; the top of the second shell is connected to the bottom of the first shell, and the cover plate is arranged on the top of the first shell.

5. The direction-adaptive vortex-induced vibration-based triboelectric nanogenerator according to claim 4, characterized in that: The upper end surface of the second shell is provided with a plurality of grooves, and the plurality of grooves are used to fix the solid-liquid friction power generation module.

6. The direction-adaptive vortex-induced vibration-based triboelectric nanogenerator according to claim 4, characterized in that: A through hole is provided in the middle of the cover plate for fixing the rotary friction power generation module.

7. The direction-adaptive vortex-induced vibration-based triboelectric nanogenerator according to claim 1, characterized in that: The rotary friction power generation module includes a hollow tube, a bearing, a counterweight, a rotor substrate, an aluminum sheet, a polyimide film, a stator copper sheet and a stator substrate; the upper part of the hollow tube is connected to the cylindrical flow module; the bottom of the hollow tube is connected to the stator substrate, the top surface of the stator substrate is provided with the stator copper sheet, and the top surface of the stator copper sheet is provided with the polyimide film; the rotor substrate is rotatably sleeved on the hollow tube through the bearing, and the bottom surface of the rotor substrate is provided with the aluminum sheet; the rotor substrate and the stator substrate each include at least two blades; the stator copper sheet has the same shape as the stator substrate, and the aluminum sheet has the same shape as the rotor substrate; the counterweight is provided on one of the blades of the rotor substrate.

8. The direction-adaptive vortex-induced vibration-based triboelectric nanogenerator according to claim 7, characterized in that: The stator substrate and the rotor substrate are both made of acrylic.

9. The direction-adaptive vortex-induced vibration-based triboelectric nanogenerator according to claim 1, characterized in that: The solid-liquid friction power generation module includes a guide disc, a carrier plate and a friction plate; the guide disc is provided with a plurality of through-going long through holes and a plurality of carrier grooves, the top of the carrier plate is arranged in the carrier groove, and the friction plate is arranged on the carrier plate; at least two bosses are arranged around the bottom surface of the guide disc, and the bosses are used to connect with the cylindrical flow module.

10. The direction-adaptive vortex-induced vibration-based triboelectric nanogenerator according to claim 9, characterized in that: The friction plate includes an FEP film and a copper plate; the copper plate is sealed in the FEP film.

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