Sandwich friction nanometer generator and omni-directional breeze energy power generation device

Abstract

The invention discloses a sandwich friction nanometer generator and an omni-directional breeze energy power generation device. The generator comprises a dielectric film and a metal electrode. The sandwich friction nanometer generator further comprises a hollow elastomer and a sandwich elastic sheet. The sandwich elastic sheet is arranged in the hollow elastic body and is of an arch-sheet-shaped cantilever structure. And metal electrodes are fixed on the side surfaces of the sandwich elastic sheets and the inner side surfaces of the hollow elastomers, which are opposite to each other, so that a friction electrode pair is formed. And one metal electrode of the friction electrode pair is covered with a dielectric film. In the pressing process, microscopic sliding friction occurs between the sandwich layer and the outer layer material, and the surface charge density can be effectively increased; and in the release process, the sandwich layer generates high-frequency vibration, so that the capacitive reactance of the power generation unit can be reduced, and the output power is improved. In addition, due to the co-prime design of the rollers and the friction generator sets in the omni-directional breeze energy power generation device, the friction generator sets generate power in a phase difference mode, and output electric signals are more stable.

Description

Technical Field

[0001] The present invention belongs to the technical field of friction power generation, and in particular relates to a sandwich friction nanogenerator and an omnidirectional micro-wind power generation device. Background Art

[0002] In the era of artificial intelligence and the Internet of Things (IoT), wireless sensor networks have become a crucial means for humans to perceive information from the natural world. Wireless sensor networks (WSNs) are composed of numerous processors, sensors, and radio nodes. Deploying these numerous sensor network nodes requires a massive distributed power supply. Due to the limitations of non-renewable energy, the development of green energy sources such as wind power is imperative. Currently, wind energy is primarily harvested by wind turbines, which are then distributed to distributed power nodes via long-distance power lines. However, wind turbines are bulky, expensive to install, difficult to install, and require high starting wind speeds. These turbines are difficult to effectively and continuously harvest near-ground winds with an average annual speed of approximately 3 m / s, making them inadequate as distributed power sources for WSN nodes. Small wind turbines based on electromagnetic induction, while simple in structure, high in electromechanical coupling, and easy to fabricate, still suffer from suboptimal power generation efficiency at low wind speeds. Therefore, the development of lightweight, easy-to-install, low-cost generators that can efficiently harvest low-quality wind energy is imperative.

[0003] As an emerging energy harvesting technology, triboelectric nanogenerators (TGNs) offer high power generation efficiency at low-frequency excitation, a wide range of materials, and are suitable for efficient power generation in low wind speed environments. However, previous TGN-based wind energy harvesting devices have been limited by high starting wind speeds, low power generation, and low energy collection efficiency. Given these challenges, developing a TGN-based device that can start and generate power efficiently at lower wind speeds is crucial. Summary of the Invention

[0004] The purpose of the present invention is to provide a sandwich friction nanogenerator and an omnidirectional micro-wind power generation device. The omnidirectional micro-wind power generation device converts the rotational kinetic energy of the blades into electrical energy through the contact friction separation of the material, can automatically adapt to the wind direction at low wind speeds, power distributed WSN nodes, and reduce laying costs.

[0005] In a first aspect, the present invention provides a sandwich triboelectric nanogenerator comprising a dielectric film and metal electrodes. The sandwich triboelectric nanogenerator further comprises a hollow elastomer and a sandwich elastic sheet. The sandwich elastic sheet is disposed within the hollow elastomer and has an arched, sheet-like, cantilever structure. Metal electrodes are affixed to opposing sides of the sandwich elastic sheet and the inner side of the hollow elastomer, forming a triboelectric electrode pair. One of the metal electrodes in the triboelectric electrode pair is covered with a dielectric film.

[0006] Preferably, the hollow elastic body is formed by connecting two arched elastic sheets. The concave side surfaces of the two arched elastic sheets face each other. One side edge of the sandwich elastic sheet is connected to the connection between the two arched elastic sheets. The two arched elastic sheets are respectively a first arched elastic sheet and a second arched elastic sheet. The convex side surface of the sandwich elastic sheet and the inner side surface of the second arched elastic sheet are both covered with a first metal electrode. The concave side surface of the sandwich elastic sheet and the inner side surface of the first arched elastic sheet are both covered with a second metal electrode. The outer sides of the two second metal electrodes are both covered with a dielectric film. The first metal electrode and the second metal electrode corresponding to each other form a friction electrode pair.

[0007] Preferably, the first metal electrodes are electrically connected to form a first output terminal, the second metal electrodes are electrically connected to form a second output terminal, and the first output terminal and the second output terminal form an output interface of the sandwich triboelectric nanogenerator.

[0008] In a second aspect, the present invention provides a triboelectric power generation method using the aforementioned sandwich triboelectric nanogenerator. The triboelectric power generation method comprises: pressing and releasing a hollow elastic body.

[0009] During the pressing process, the first and second metal electrodes approach each other, and electrons flow from the first metal electrode to the second metal electrode. The positive charge on the second metal electrode gradually decreases, while the positive charge on the first metal electrode gradually increases. During the release process, the hollow elastic body rebounds and the first metal electrode and the dielectric film begin to separate, and electrons flow from the second metal electrode to the first metal electrode. The positive charge on the second metal electrode gradually increases, while the positive charge on the first metal electrode gradually decreases.

[0010] During the pressing and releasing process, the contacting hollow elastomer and the sandwich elastic sheet continue to deform, and contact deformation and microscopic sliding friction occur between the first metal electrode and the dielectric film on the surface of the hollow elastomer and the sandwich elastic sheet, thereby increasing the microscopic effective contact area of ​​the surface and improving the surface charge density of the friction material.

[0011] In a third aspect, the present invention provides an omnidirectional micro-wind energy power generation device, which includes wind-catching blades and a main power generation mechanism. The main power generation mechanism includes a stator housing, a rotor body and a plurality of friction generator sets. The rotor body includes a rotor frame and one or more rollers. The rotor frame is rotatably connected to the stator housing and is coaxially fixed or transmission-connected to the wind-catching blades. The rotor frame is equipped with a plurality of rollers arranged in sequence along the circumferential direction of the rotor frame's rotation axis. The plurality of friction generator sets are installed in the stator housing and are arranged around the rotor body. The friction generator set includes one or a plurality of stacked power generation units. The power generation unit adopts the aforementioned sandwich friction nanogenerator. During the rotation of the rotor frame, the rollers press each friction generator set one by one.

[0012] Preferably, there are a plurality of rollers, and the number of rollers and the number of friction generator sets are prime numbers to each other.

[0013] Preferably, the power generation units in the same friction generator set are directly connected in parallel. The output interfaces of the friction generator sets are connected in parallel after passing through rectifier elements.

[0014] Preferably, the friction generator set further comprises an arched pressure plate, a flat pressure plate, and a power generation mounting platform. The power generation unit is disposed between the flat pressure plate and the power generation mounting platform. The power generation mounting platform is fixed within the stator housing. One side of the arched pressure plate is rotatably connected to the stator housing. One side of the arched pressure plate abuts against the flat pressure plate.

[0015] Preferably, an elastic element is provided between the arched pressure plate and the stator housing, and the elastic element provides elastic force for the arched pressure plate to move away from the corresponding flat pressure plate.

[0016] Preferably, the omnidirectional micro-wind power generation device further comprises a base, a rotating bracket, and a tail fin. The rotating bracket is rotatably connected to the base. The wind-catching blades are rotatably connected to the rotating bracket. The tail fin is fixed to the stator housing of the main power generation mechanism or to the rotating bracket.

[0017] In a fourth aspect, the present invention provides an omnidirectional micro-wind power generation method, characterized by employing the aforementioned omnidirectional micro-wind power generation device. The omnidirectional micro-wind power generation method includes: the wind-catching blades face the wind direction, the wind driving the wind-catching blades to rotate, the wind-catching blades driving the rotor body to rotate, the rollers pressing and releasing each friction generator set, and each friction generator set outputting electrical energy.

[0018] The beneficial effects of the present invention are as follows: 1. When the sandwich triboelectric nanogenerator provided by the present invention is pressed, microscopic sliding friction occurs between the sandwich layer and the outer layer material, which can effectively increase the surface charge density; when it is released, the sandwich layer generates high-frequency vibration, which can reduce the capacitive reactance of the power generation unit and increase the output power.

[0019] 2. The number of rollers providing pressure in the omnidirectional breeze power generation device provided by this invention is prime to the number of friction generators, enabling each generator to generate power with phase difference. The rectified parallel output signal is more stable, approaching stable direct current (DC), thus simplifying the design of the energy management circuit. This design also effectively reduces torque during startup and operation, lowering the starting wind speed of the generator and improving operational stability.

[0020] 3. The present invention couples the wind-catching blades with the tail fin, so that the device can automatically adjust its orientation according to the actual wind direction, thereby improving the environmental adaptability of the power generation device and increasing the wind energy collection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram of the power generation device provided in Example 1 of the present invention.

[0022] Figure 2 This is an exploded diagram of the power generation device provided in Example 1 of the present invention.

[0023] Figure 3 This is a schematic structural diagram of the main power generation mechanism in Example 1 of the present invention (the rectifier element is not shown in the figure).

[0024] Figure 4 This is a schematic diagram of the installation of the rotor body in Example 1 of the present invention.

[0025] Figure 5 This is a schematic diagram of the installation of the friction generator set in Example 1 of the present invention.

[0026] Figure 6 This is a schematic structural diagram of the power generation unit in Example 1 of the present invention.

[0027] Figure 7 Schematic diagram of the friction power generation process of a single friction generator set in Example 2 of the present invention.

[0028] Figure 8 This is a diagram showing the friction power generation principle of the power generation unit in Example 2 of the present invention.

[0029] Figure 9 This is a schematic diagram of embodiment 2 of the present invention in which the friction generator sets are rectified and connected in parallel to a bus circuit to supply power to electrical devices.

[0030] Figure numerals: 1. wind-catching blade; 2. mounting frame; 3. tail fin; 4. stator housing; 5. roller; 6. rotor frame; 7. flange; 8. arched pressure plate; 9. main shaft; 10. hollow elastic body; 11. flat pressure plate; 12. power generation installation platform; 13. tail cover; 14. rotating shaft; 15. rotating base; 16. cross bearing; 17. base; 18. cap; 19. dielectric film; 20. sandwich elastic sheet; 21. first metal electrode; 22. second metal electrode; 23. power generation unit; 101. first arched elastic sheet; 102. second arched elastic sheet. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] Example 1

[0033] like Figure 1 and Figure 2As shown, an omnidirectional micro-wind power generation device based on a friction nanogenerator includes a wind-catching blade 1, a cap 18, a base 17, a rotating bracket, a tail fin 3 and a main power generation mechanism. The rotating bracket and the base 17 form a rotating pair with a common axis vertically arranged. The two ends of the central axis of the wind-catching blade 1 and the two supporting positions on the top of the rotating bracket form a rotating pair with a common axis horizontally arranged. The stator housing 4 of the main power generation mechanism is fixed on the rotating bracket. The main shaft 9 of the main power generation mechanism is coaxially fixed with the central axis of the wind-catching blade 1. The tail fin 3 is fixed to the top of the stator housing 4 of the main power generation mechanism. The cap 18 is conical and fixed to the end of the central axis of the wind-catching blade 1 away from the main power generation mechanism.

[0034] The rotating bracket includes a mounting frame 2, a rotating base 15, a rotating shaft 14, and a cross bearing 16. The bottom of the rotating base 15 is rotatably connected to the top of the base 17 via the cross bearing 16. The rotating shaft 14 is vertically fixed to the rotating base 15. The bottom of the mounting frame 2 is fixed to the top of the rotating shaft 14.

[0035] like Figure 3 As shown, the main power generation mechanism includes a stator housing 4, a tail cover 13, a flange 7, a main shaft 9, a rotor body, and four friction generator sets. The four friction generator sets are mounted on the inner side wall of the stator housing 4 and are evenly distributed circumferentially along the central axis of the stator housing 4. The main shaft 9 is coaxially connected to the stator housing 4 for rotation. The main shaft 9 is fixed to the central axis of the wind-catching blade 1 via the flange 7. The rotor body is coaxially mounted on the main shaft 9 and is used to periodically press and release the four friction generator sets to achieve continuous power generation. The tail cover 13 is fixed to the end opening of the stator housing 4 facing away from the wind-catching blade 1.

[0036] like Figure 3 and Figure 4 As shown, the rotor body comprises a rotor frame 6 and three rollers 5. The rotor frame 6 is coaxially fixed to the main shaft 9. Three arms extend from the rotor frame 6, evenly spaced circumferentially along its axis. The three rollers 5 are rotatably connected to the outer ends of the three arms. During operation, as the rotor frame 6 rotates, the three rollers 5 periodically press against the four triboelectric generators, generating continuous triboelectric power.

[0037] like Figure 3 and Figure 5As shown, the friction generator set includes an arched pressure plate 8, a flat pressure plate 11, a power generation installation platform 12, and three power generation units 23 stacked and arranged between the flat pressure plate 11 and the power generation installation platform 12. The power generation installation platform 12 is fixed on the inner wall of the stator housing 4. One side edge of the arched pressure plate 8 is rotatably connected to the inner wall of the stator housing 4 through a hinge shaft. The inner concave surface of the arched pressure plate 8 faces the flat pressure plate 11. A torsion spring is sleeved on the hinge shaft. The two ends of the torsion spring are respectively connected to the arched pressure plate 8 and the inner wall of the stator housing 4. The elastic torque of the arched pressure plate 8 away from the flat pressure plate 11 is increased so that the inner concave surface of the arched pressure plate 8 is against the flat pressure plate 11.

[0038] like Figure 6 As shown, the power generation unit 23 includes a hollow elastic body 10, a sandwich elastic sheet 20, a dielectric film 19, a first metal electrode 21, and a second metal electrode 22. The hollow elastic body 10 has a shuttle-shaped structure, formed by two arched elastic sheets. The concave sides of the two arched elastic sheets face each other and are connected at the edges. The two arched elastic sheets are respectively a first arched elastic sheet 101 and a second arched elastic sheet 102.

[0039] The sandwich elastic sheet 20 is disposed within the hollow elastic body 10 and has an arched, cantilevered beam structure. One side edge of the sandwich elastic sheet 20 is connected to the side edge of the inner cavity of the hollow elastic body 10 (i.e., the junction of the two arched elastic sheets), forming a structure similar to a flexible hinge. The other side edge of the sandwich elastic sheet 20 is suspended in the air.

[0040] The convex side surface of the sandwich elastic sheet 20 and the inner side surface of the second arched elastic sheet 102 are both covered with a first metal electrode 21. The concave side surface of the sandwich elastic sheet 20 and the inner side surface of the first arched elastic sheet 101 are both covered with a second metal electrode 22. The outer sides of the two second metal electrodes 22 are both covered with a dielectric film 19. The first metal electrode 21 and the second metal electrode 22 facing each other form an electrode pair for triboelectric power generation, thereby forming an electrode pair on each side of the sandwich elastic sheet 20. The first electrode pair is located between the concave side surface of the sandwich elastic sheet 20 and the second arched elastic sheet 102. The second electrode pair is located between the convex side surface of the sandwich elastic sheet 20 and the first arched elastic sheet 101.

[0041] The first metal electrodes 21 of all generating units in each triboelectric generator set are connected together via wires to form the first output terminal of the output interface. The second metal electrodes 22 of all generating units are also connected together via wires to form the second output terminal of the output interface. The output terminals of all triboelectric generator sets are connected in parallel through a rectifier element to form a triboelectric group, which is then connected to a load. The load is an electrical device or an electrical storage device. The electrical storage device can be a supercapacitor or a rechargeable battery pack.

[0042] In some embodiments, dielectric film 19 is made of polytetrafluoroethylene (PTFE), a polymer with high-temperature resistance and an extremely low friction coefficient, thereby enhancing triboelectric generation. First and second metal electrodes 21 and 22 are made of copper thin films, which are micro-machined using etching or other microfabrication techniques to form surface microstructures. These surface microstructures may be nanowire structures, nanorod structures, or other microstructures that enhance triboelectric generation efficiency.

[0043] In some embodiments, the sandwich elastic sheet 20 is made of polyester resin, which has excellent fatigue resistance, rigidity, friction resistance, and dimensional stability, effectively maintaining the arched shape. The hollow elastic body 10 is made of fluorinated ethylene propylene copolymer, which has properties similar to polytetrafluoroethylene and the good processing properties of thermoplastics, and has good rebound performance.

[0044] In some other embodiments, the number of rollers 5 and the number of friction generators can be different. In some further preferred embodiments, the number of rollers 5 and the number of friction generators are mutually prime. The mutually prime number of arched pressure plates 8 and rollers 5 constitute a torque self-regulating mechanism, ensuring that the degree of compression applied to each friction generator at the same time varies. This helps reduce the maximum resistance experienced by the rotor body, ensures that the resistance experienced by the rotor body varies more uniformly over time, and stabilizes the rotor body's rotational speed, thereby improving the efficiency of wind power generation.

[0045] In some embodiments, the mounting frame 2 is integrally formed, and the rear end claws are used to position and fix the stator housing 4 and the tail cover 13. Through holes are provided on the front end claws and the rear end claws of the mounting frame 2 for horizontally mounting the central axis of the wind-catching blade 1. A countersunk hole is provided at the bottom of the mounting frame 2, which is connected to the rotating shaft 14. A through hole is provided on the outer edge of the stator housing 4 for connecting the mounting frame 2, the tail cover 13 and the tail fin 3. The top of the rotating base 15 is connected to the mounting frame 2 through the rotating shaft 14. The bottom of the rotating base 15 is connected to the outer ring of the cross bearing 16; a plurality of through holes are provided on the base 17, the bottom of which is connected to the ground, and the top is connected to the inner ring of the cross bearing 16.

[0046] In some embodiments, the tail cover 13 , the mounting bracket 2 , the rotating base 15 , and the base 17 are all made of ABS-like photosensitive resin material.

[0047] In some embodiments, the flat plate 11 is made of PLA (polylactic acid) and is glued to the corresponding power generation unit 23 .

[0048] In some embodiments, the inner wall of the stator housing 4 is provided with four grooves, each for mounting four triboelectric generators. The generator mounting platform 12 of each triboelectric generator is provided with protrusions that match the grooves. The protrusions on the generator mounting platform 12 tightly engage with the grooves on the inner wall of the stator housing 4, thereby positioning the triboelectric generators in their proper locations.

[0049] In some embodiments, the wind-catching blade is a spiral blade stretched from an Archimedean spiral, the rotational power generated by it is transmitted through a main shaft, a shaft end cap is installed at the front end, the main shaft passes through the blade and is connected to the cap at the top.

[0050] Example 2

[0051] An omnidirectional breeze power generation method using the omnidirectional breeze power generation device provided in Example 1. The process of the omnidirectional breeze power generation method is as follows: In the initial state, in the friction generator set pressed by the roller 5, the roller 5 presses the arched pressure plate 8 and then presses the power generation unit 23. At this time, the dielectric film 19 and the first metal electrode 21 are in contact and friction, and equal and opposite charges are generated on the surfaces of the two. At this time, there is no separation, and there is no potential difference between the first output end and the second output end.

[0052] Driven by wind, the wind-catching blades 1 drive the main shaft 9 in the main power generation mechanism to rotate, driving the rollers to periodically press and release the friction generator sets.

[0053] like Figure 7 and Figure 8 As shown, in the process of the roller pressing the friction generator set, the power generation unit 23 is excited and loaded. As the dielectric film 19 in the same electrode pair approaches the first metal electrode 21, the potential difference gradually decreases, and electrons flow from the first metal electrode 21 to the second metal electrode 22, generating an instantaneous current. At this time, the positive charge carried by the second metal electrode 22 gradually decreases, and the positive charge carried by the first metal electrode 21 gradually increases; when the dielectric film 19 contacts the first metal electrode 21, the positive charge carried by the second metal electrode 22 is neutralized by the electrons, and the positive charge carried by the first metal electrode 21 reaches the maximum value, which is equal to the negative charge carried by the dielectric film 19.

[0054] During the process of the roller releasing the friction generator set, due to the elastic rebound of the hollow elastomer 10, the first metal electrode 21 begins to separate from the dielectric film 19, and a potential difference is generated between the first output end and the second output end, driving electrons to transfer from the second output end to the first output end, forming an instantaneous reverse current. At this time, the positive charge carried by the second metal electrode 22 gradually increases, and the positive charge carried by the first metal electrode 21 gradually decreases; when the distance between the dielectric film 19 and the first metal electrode 21 reaches the maximum, the charge transfer reaches saturation, and the positive charge carried by the second metal electrode 22 and the negative charge carried by the dielectric film 19 reach charge balance.

[0055] The process of pressing and releasing the triboelectric generator corresponds to one power generation cycle. Furthermore, when the power generation unit 23 is pressed, the arched sandwich elastic sheet 20 is subjected to periodic unilateral push and pull forces, causing microscopic sliding friction between the first metal electrode 21 attached thereto and the dielectric film 19. This increases the microscopic effective contact area on the surface, thereby increasing the surface charge density of the friction material.

[0056] Since the number of rollers 5 and the number of friction generator sets are mutually prime, the power generation of adjacent friction generator sets is not synchronized, and there is a certain time difference, which is manifested as a phase difference of the electrical signal. Figure 9 As shown, multiple phase-shifted triboelectric generators are connected in parallel to a bus circuit after rectification to achieve quasi-DC output. The electricity generated by the triboelectric generators powers electrical devices or is stored in supercapacitors or rechargeable batteries.

[0057] In a wind farm, a high-pressure area forms on the windward side of the tip of wind-catcher blade 1, while a low-pressure area forms on the leeward side. This pressure differential generates a resultant force perpendicular to the surface of wind-catcher blade 1, driving it to rotate about axis 14 until the main axis 9 is aligned with the wind direction, initially achieving wind-direction adaptation. A pressure differential also forms on the windward and leeward sides of tail fin 3, similarly driving the main axis 9 of the generator parallel to the wind direction, thus enhancing wind-direction adaptation capabilities.

[0058] The above describes specific embodiments of the present invention. It should be noted that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. In the absence of conflict, the embodiments of this application and the features in the embodiments may be combined with each other in any manner.

Claims

1. A sandwich triboelectric nanogenerator comprising a dielectric film (19) and a metal electrode; characterized in that: The sandwich triboelectric nanogenerator further comprises a hollow elastic body (10) and a sandwich elastic sheet (20); the sandwich elastic sheet (20) is arranged in the hollow elastic body (10) and presents an arched sheet-like cantilever structure; metal electrodes are fixed on the side surfaces of the sandwich elastic sheet (20) and the inner side surfaces of the hollow elastic body (10) facing each other, forming a triboelectric electrode pair; one of the metal electrodes of the triboelectric electrode pair is covered with a dielectric film (19).

2. The sandwich triboelectric nanogenerator according to claim 1, characterized in that: The hollow elastic body (10) is formed by connecting two arched elastic sheets; the inner concave side surfaces of the two arched elastic sheets face each other; one side edge of the sandwich elastic sheet (20) is connected to the connection between the two arched elastic sheets; the two arched elastic sheets are respectively a first arched elastic sheet (101) and a second arched elastic sheet (102); the outer convex side surface of the sandwich elastic sheet (20) and the inner side surface of the second arched elastic sheet (102) are both covered with a first metal electrode (21); the inner concave side surface of the sandwich elastic sheet (20) and the inner side surface of the first arched elastic sheet (101) are both covered with a second metal electrode (22); the outer sides of the two second metal electrodes (22) are both covered with a dielectric film (19); the first metal electrodes (21) and the second metal electrodes (22) corresponding to each other form a friction electrode pair.

3. A friction power generation method, characterized in that: Using the sandwich triboelectric nanogenerator as claimed in claim 2; the triboelectric power generation method comprises: pressing and releasing the hollow elastic body (10); During the pressing process, the first metal electrode (21) and the second metal electrode (22) approach each other, and electrons flow from the first metal electrode (21) to the second metal electrode (22); the positive charge carried by the second metal electrode gradually decreases, and the positive charge carried by the first metal electrode gradually increases; during the releasing process, the hollow elastic body (10) rebounds and recovers, the first metal electrode (21) and the dielectric film (19) begin to separate, and electrons flow from the second metal electrode (22) to the first metal electrode (21); the positive charge carried by the second metal electrode (22) gradually increases, and the positive charge carried by the first metal electrode (21) gradually decreases; During the pressing and releasing process, contact deformation and microscopic sliding friction occur between the hollow elastic body (10) and the first metal electrode (21) on the surface of the sandwich elastic sheet (20) and the dielectric film (19).

4. An omnidirectional micro-wind power generation device, comprising a wind-catching blade (1) and a main power generation mechanism; characterized in that: The main power generation mechanism includes a stator housing (4), a rotor body and a plurality of friction generator sets; the rotor body includes a rotor frame (6) and one or more rollers (5); the rotor frame (6) is rotatably connected to the stator housing (4) and is coaxially fixed or transmission-connected to the wind-catching blade (1); the rotor frame (6) is provided with a plurality of rollers (5) arranged in sequence along the circumferential direction of the rotation axis of the rotor frame (6); the plurality of friction generator sets are installed in the stator housing (4) and are arranged around the rotor body; the friction generator set includes one or a plurality of stacked power generation units (23); the power generation unit (23) adopts a sandwich friction nanogenerator as described in claim 1; during the rotation of the rotor frame (6), the rollers (5) press each friction generator set one by one.

5. The omnidirectional breeze energy power generation device according to claim 4, characterized in that: There are multiple rollers (5); the number of rollers (5) and the number of friction generator sets are prime numbers to each other.

6. The omnidirectional breeze power generation device according to claim 5, characterized in that: The power generation units (23) in the same friction generator set are directly connected in parallel; the output interfaces of the friction generator sets are connected in parallel after passing through the rectifier elements.

7. The omnidirectional breeze power generation device according to claim 4, characterized in that: The friction generator set further comprises an arched pressure plate (8), a flat pressure plate (11) and a power generation installation platform (12); the power generation unit (23) is arranged between the flat pressure plate (11) and the power generation installation platform (12); the power generation installation platform (12) is fixed in the stator housing (4); one side of the arched pressure plate (8) is rotatably connected to the stator housing (4); and one side of the arched pressure plate (8) abuts against the flat pressure plate (11).

8. The omnidirectional breeze power generation device according to claim 7, characterized in that: An elastic element is provided between the arched pressure plate (8) and the stator housing (4); the elastic element provides an elastic force for the arched pressure plate (8) to deviate from the corresponding flat pressure plate (11).

9. The omnidirectional breeze energy power generation device according to claim 4, characterized in that: It also includes a base (17), a rotating bracket and a tail fin (3); the rotating bracket is rotatably connected to the base (17); the wind-catching blade (1) is rotatably connected to the rotating bracket; and the tail fin (3) is fixed to the stator housing (4) of the main power generation mechanism, or fixed to the rotating bracket.

10. An omnidirectional breeze energy power generation method, characterized by: An omnidirectional micro-wind power generation device as claimed in claim 4 is used; the omnidirectional micro-wind power generation method comprises: the wind-catching blade (1) faces the wind direction, the wind force drives the wind-catching blade (1) to rotate, the wind-catching blade (1) drives the rotor body to rotate, the roller presses and releases each friction generator set, and each friction generator set outputs electrical energy to the outside.

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