A portable mechanical energy collection device based on friction nanogeneration technology

Abstract

The application provides a portable mechanical energy collection device based on friction nanogenerator technology, which comprises a transmission unit and a power generation unit connected in sequence, the transmission unit comprises a compound pendulum, a one-way clutch and a speed increasing gear set connected in sequence, the power generation unit comprises a rotor part provided with a friction layer and a stator part provided with an electrode layer, the compound pendulum drives the one-way clutch and the speed increasing gear set to rotate under the action of external force, and the rotor part rotates synchronously with the speed increasing gear set. The application is applied to collecting low-frequency and random mechanical energy in the environment, and converts the mechanical energy into electric energy to supply power for micro devices, thereby avoiding the use of external power supply; the unique transmission mechanism can convert external low-frequency mechanical movement into one-way high-speed rotation of the rotor, generates super high frequency output, and greatly improves the energy collection efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of nano-power generation, specifically a portable mechanical energy harvesting device based on triboelectric nano-power generation technology. Background Technology

[0002] With the rapid development of microelectronics and wireless communication technologies, the power consumption of microelectronic devices has been significantly reduced. At the same time, various micro energy harvesters have emerged and are gradually being integrated with low-power electronic devices to achieve self-powered and self-driven systems. Furthermore, mechanical energy in nature is widely distributed and exists in enormous quantities, making it promising to be collected and converted into electrical energy for use by microelectronic devices through energy harvesting technology.

[0003] In recent years, triboelectric nanogenerators (TENGs), as an emerging energy harvesting technology, have been able to capture various forms of mechanical energy wasted in daily life, including human motion, object vibration, mechanical triggering, and tire rotation. Compared to traditional linear resonant triboelectric nanogenerators, pendulum-based triboelectric nanogenerators have advantages such as a wider operating frequency range, lower damping, and more degrees of freedom, making them particularly suitable for capturing low-frequency, random-amplitude mechanical motion.

[0004] As disclosed in Chinese Invention Patent Application Publication No. CN110011562 A, a swing-type triboelectric nanogenerator comprises: a mass block, an inner cylinder, an inner cylinder cover plate, a bearing, an arched flexible thin film array, a central shaft, an outer cylinder, an electrode array, and an outer cylinder cover plate. The power generation part of this invention is an independent layered triboelectric nanogenerator composed of the arched flexible thin film array and the electrode array; other parts ensure sufficient contact and relative movement between the arched flexible thin film array and the electrode array. Because the arched structure of the flexible thin film facilitates the relative movement between the film and the electrodes, it can convert various swing or vibration energies into electrical energy.

[0005] However, the aforementioned existing technologies have the following problems: 1. The energy harvesting efficiency of the transmission system is directly proportional to the rotor speed. Simple oscillating friction results in a low rotor speed, leading to low power generation efficiency. 2. Bidirectional motion makes it difficult to keep the rotor rotating continuously.

[0006] Therefore, how to design new energy conversion mechanisms to efficiently collect low-frequency mechanical energy and improve power generation efficiency is an urgent technical problem to be solved. Summary of the Invention

[0007] To address the shortcomings in the aforementioned background technology, this invention proposes a portable mechanical energy harvesting device based on triboelectric nanogenerator technology, which solves the technical problem of low power generation efficiency.

[0008] The technical solution of this application is as follows: A portable mechanical energy harvesting device based on triboelectric nanogenerator technology includes a connected transmission unit and a power generation unit. The transmission unit includes a compound pendulum, a one-way clutch, and a speed-increasing gear set connected in sequence. The power generation unit includes a rotor with a friction layer and a stator with an electrode layer. Under external force, the compound pendulum drives the one-way clutch and the speed-increasing gear set to rotate, and the rotor rotates synchronously with the speed-increasing gear set. This invention is applied to harvesting low-frequency, random mechanical energy in the environment and converting it into electrical energy to power micro-devices, avoiding the use of an external power source. The unique transmission mechanism can convert external low-frequency mechanical motion into unidirectional high-speed rotation of the rotor, generating ultra-high frequency output and significantly improving energy harvesting efficiency. This device can harvest energy from angular rotational motion in the direction of the rotation axis, has a wide operating frequency band and low mechanical damping, greatly improving energy harvesting capability and versatility. The coaxial transmission mechanism ensures the compactness between the components, resulting in a small size, high space utilization, and can be worn by the human body or moving objects to harvest mechanical energy generated by motion, possessing excellent portability.

[0009] Furthermore, the compound pendulum includes a pendulum rod connected to an arc-shaped pendulum hammer. The upper end of the pendulum rod is provided with a bearing through which the shaft rod passes. The pendulum rod is connected to the one-way clutch, and the transmission unit drives the power generation unit to rotate and generate electricity.

[0010] Furthermore, the one-way clutch is connected to the rocker arm via an inner wheel, and an outer ring is fitted around the outer circumference of the inner wheel. Rollers are arranged between the outer ring and the inner wheel, and the inner wheel swings along the inner wall of the outer ring with the rocker arm.

[0011] Furthermore, the inner wheel is provided with a groove for placing the roller. The size of one end of the groove is larger than the diameter of the roller, and the size of the other end of the groove is smaller than the diameter of the roller. When the inner wheel rotates in the forward direction, there is a gap between the roller and the inner wheel and the outer ring, and the outer ring does not rotate with the inner wheel. When the inner wheel rotates in the reverse direction, the roller is engaged between the inner wheel and the outer ring, and the outer ring rotates with the inner wheel.

[0012] Furthermore, the inner wheel is provided with a plurality of slots.

[0013] Furthermore, the speed-increasing gear set includes an internal gear ring connected to the outer ring, the internal gear ring meshing with the main gear, and the main gear connected to the rotor.

[0014] Furthermore, the speed-increasing gear set includes an internal gear ring connected to the outer ring, a main gear coaxially connected to the internal gear ring, and a transition gear meshing between the main gear and the internal gear ring to achieve the effect of increasing the rotational speed. The main gear is connected to the rotor section.

[0015] Furthermore, the friction layer includes a radially arranged array of PTFE films disposed on the outer side of the rotor portion, and the electrode layer includes two electrodes arranged alternately at equal intervals in the circumferential direction on the inner side of the stator portion, with the outer side and the inner side being attached together.

[0016] Furthermore, both the transmission unit and the power generation unit are housed within the housing, and the housing has a second hole through which the shaft passes. The outer side of the stator is connected to the inner side of the housing.

[0017] Furthermore, the rotor and stator are each provided with a hole three for the shaft to pass through. The bearing one, the bearing two located at the center of the inner wheel, the hole one located at the center of the main gear, the hole two, and the hole three are all located on the same straight line, and all components swing around the shaft.

[0018] The specific beneficial effects of this invention include: 1. This invention is applied to collecting low-frequency, random mechanical energy in the environment and converting it into electrical energy to power micro devices, thus avoiding the use of an external power source; 2. The unique transmission mechanism can convert the external low-frequency mechanical motion into unidirectional high-speed rotation of the rotor, generating ultra-high frequency output and greatly improving energy harvesting efficiency; 3. This device can collect the energy of angular rotational motion in the direction of the rotating shaft, and has a wide operating frequency band and low mechanical damping, which greatly improves the energy harvesting capability and versatility. 4. The coaxial transmission mechanism ensures the compactness of each component, resulting in a small size and high space utilization. It can be worn by the human body or moving objects to collect the mechanical energy generated by movement, and has good portability. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is an exploded view of the present invention; Figure 2 This is a schematic diagram of the shaft in this invention; Figure 3 This is a schematic diagram of the compound pendulum in this invention. Figure 1 ; Figure 4 This is a schematic diagram of the compound pendulum in this invention. Figure 2 ; Figure 5 This is a schematic diagram of the one-way clutch in this invention; Figure 6 This is a cross-sectional view of the one-way clutch in this invention; Figure 7 This is a schematic diagram of the speed-increasing gear set in this invention; Figure 8 This is a schematic diagram of the main gear in this invention; Figure 9 This is a schematic diagram of the inner side of the rotor section in this invention; Figure 10 This is a schematic diagram of the outer side of the rotor section in this invention; Figure 11 This is a schematic diagram of the inner surface of the stator section in this invention; Figure 12 This is a schematic diagram of the outer surface of the stator section in this invention; Figure 13 This is a schematic diagram of the housing in this invention.

[0021] Explanation of icon numbers: 1. Transmission unit; 2. Power generation unit; 3. Rotor section; 4. Stator section; 5. Axle; 6. Compound pendulum; 7. One-way clutch; 8. Speed-increasing gear set; 9. Pendulum rod; 10. Circular arc pendulum; 11. Bearing 1; 12. Boss 1; 13. Bearing 2; 14. Inner wheel; 15. Ring; 16. Roller; 17. Groove; 18. Beam arm; 19. Internal gear ring; 20. Clamping block; 21. Main gear; 22. Transition gear; 23. Boss 2; 24. Fixing rod; 25. Housing; 26. PTFE thin film array; 27. Electrode 1; 28. Electrode 2; 29. Buckle; 30. Center hole. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: A portable mechanical energy harvesting device based on triboelectric nanogenerator technology, such as... Figure 1 As shown, the device includes a connected transmission unit 1 and a power generation unit 2. The transmission unit 1 includes a compound pendulum 6, a one-way clutch 7, and a speed-increasing gear set 8 connected in sequence. The power generation unit 2 includes a rotor part 3 with a friction layer and a stator part 4 with an electrode layer. Under the action of external force, the compound pendulum 6 drives the one-way clutch 7 and the speed-increasing gear set 8 to rotate, and the rotor part 3 rotates synchronously with the speed-increasing gear set 8. This invention is applied to collecting low-frequency, random mechanical energy in the environment and converting it into electrical energy to power micro-devices, avoiding the use of an external power source. The unique transmission mechanism can convert external low-frequency mechanical motion into unidirectional high-speed rotation of the rotor, generating ultra-high frequency output and significantly improving energy collection efficiency. This device can collect the energy of angular rotational motion in the direction of the rotating shaft, has a wide operating frequency band and low mechanical damping, greatly improving energy collection capability and versatility. The coaxial transmission mechanism ensures the compactness between the components, small size, high space utilization, and can be worn by the human body or moving objects to collect mechanical energy generated by motion, possessing good portability.

[0024] Based on the above implementation methods, such as Figure 3 , Figure 4 As shown, the compound pendulum 6 includes a pendulum rod 9, the lower end of which is connected to an arc-shaped pendulum hammer 10. The upper end of the pendulum rod 9 is provided with a bearing 11 through which the shaft rod 5 passes. The pendulum rod 9 is connected to the one-way clutch 7. The upper end of the pendulum rod 9 is provided with a bearing 11 through which the shaft rod 5 passes, and the outer periphery of the bearing 11 is provided with a boss 12 that connects to the one-way clutch 7.

[0025] Preferably, the circular pendulum 10 is designed as a fan-shaped ring to maximize the rotational inertia by positioning the center as far outward as possible, thereby enhancing the oscillation effect. The boss 12 is annularly protruding around the bearing 11 and is connected to the one-way clutch 7, while maintaining a gap between the compound pendulum 6 and the one-way clutch 7 to prevent collision.

[0026] Based on the above implementation methods, such as Figure 5 As shown, the one-way clutch 7 is connected to the rocker arm 9 via the inner wheel 14. The outer ring 15 is sleeved on the outer periphery of the inner wheel 14. A roller 16 is provided between the outer ring 15 and the inner wheel 14. The inner wheel 14 swings along the inner wall of the outer ring 15 with the rocker arm 9.

[0027] Specifically, such as Figure 6 As shown, a protrusion is provided along the centerline of the inner wall of the outer ring 15, and a groove is provided on the outer circumferential surface of the inner wheel 14 to engage with the protrusion. The inner wheel 14 rotates along the inner wall of the outer ring 15.

[0028] Based on the above embodiment, the inner wheel 14 is provided with a groove 17 for placing the roller 16. The size of one end 4 of the groove 17 is larger than the diameter of the roller 16, and the size of the other end of the groove 17 is smaller than the diameter of the roller 16. When the inner wheel 14 rotates in the forward direction, there is a gap between the roller 16 and the inner wheel 14 and the outer ring 15. The outer ring 15 does not rotate with the inner wheel 14. When the inner wheel 14 rotates in the reverse direction, the roller 16 is engaged between the inner wheel 14 and the outer ring 15. The outer ring 15 rotates with the inner wheel 14, converting the external oscillation into unidirectional continuous rotation.

[0029] Specifically, a second protrusion is provided on the bottom surface of the groove 17, and a second groove is provided on the side circumferentially of the roller 16 to cooperate with the second protrusion. The roller 16 is disposed between the first protrusion and the second protrusion and rolls.

[0030] Based on the above implementation method, the inner wheel 14 is provided with a plurality of slots 17.

[0031] Preferably, three slots 17 are provided, which are evenly distributed around the inner wheel 14.

[0032] Based on the above embodiment, the speed-increasing gear set 8 includes an internal gear ring 19 connected to the outer ring 15. The internal gear ring 19 meshes with the main gear 21, and the main gear 21 is connected to the rotor part 3. The main gear 21 is provided with a hole for the shaft 5 to pass through, and a boss 23 is provided on the side of the main gear 21 adjacent to the power generation unit 2. Figure 8 As shown, the second boss 23 is connected to the rotor part 3.

[0033] Specifically, a beam arm 18 for driving the speed-increasing gear set 8 to rotate is provided along the outer surface of the outer ring 15. The speed-increasing gear set 8 includes a locking block 20 provided along the side of the inner gear ring 19, such as... Figure 7 As shown, the locking block 20 overlaps with the beam arm 18.

[0034] Preferably, the outer surface of the outer ring 15 is provided with four beam arms 18, and the side of the inner toothed ring 19 is provided with four locking blocks 20. The rotation of the beam arms 18 drives the locking blocks 20 to rotate synchronously, and at the same time drives the inner toothed ring 19 to rotate synchronously.

[0035] Specifically, the boss 23 on the outer side of the main gear 21 is designed to leave a gap between the rotor and the internal gear ring 19 when connecting the rotor part 3, so as to prevent collision.

[0036] Based on the above implementation methods, such as Figures 9-12As shown, the friction layer includes a radially arranged array of PTFE films 26 disposed on the outer side of the rotor portion 3, and the electrode layer includes electrodes 27 and 28 disposed on the inner side of the stator portion 4 with equal circumferential spacing, and the outer side is attached to the inner side.

[0037] Specifically, the base of the rotor section 3 is an acrylic plate with a hole in the middle for the shaft 5 to pass through. A radially arranged PTFE film is attached to the outer surface of the rotor as a friction layer. The base of the stator section 4 is an acrylic plate with a hole in the middle for the shaft 5 to pass through. Electrodes 1 27 and 28 are both copper foil electrodes. Multiple electrodes 1 27 are electrically connected to each other, and multiple electrodes 28 are electrically connected to each other. Every two adjacent electrodes 1 27 and 28 form an electrode pair and are connected by an external circuit.

[0038] Preferably, both the rotor section 3 and the stator section 4 are circular.

[0039] Based on the above implementation methods, such as Figure 13 As shown, the transmission unit 1 and the power generation unit 2 are both housed inside the housing 25. The housing 25 has a hole for the shaft 5 to pass through. The outer side of the stator part 4 is connected to the inner side of the housing 25. The stator part 4 is fixed on the inner wall of the housing 25. When the rotor part 3 rotates, it generates electricity by friction with the stator part 4.

[0040] Specifically, the housing 25 is circular and includes a body and a cover. The transmission unit 1 and the power generation unit 2 are both encapsulated in the body. The shaft 5 passes through all the components and provides support, allowing the device to rotate and generate electricity.

[0041] Based on the above embodiments, as a preferred embodiment, the rotor part 3 and the stator part 4 are both provided with a hole 3 for the shaft 5 to pass through. The bearing 11, the bearing 23 provided at the center of the inner wheel 14, the hole 1, the hole 2, and the hole 3 provided at the center of the main gear 21 are all located on the same straight line, and all components swing around the shaft 5.

[0042] This invention is applied to collecting low-frequency, random mechanical energy in the environment and converting it into electrical energy to power micro-devices, avoiding the use of an external power source. The unique transmission mechanism can convert external low-frequency mechanical motion into unidirectional high-speed rotation of the rotor, generating ultra-high frequency output and significantly improving energy harvesting efficiency. The device can collect energy from angular rotational motion in the direction of the rotating shaft, has a wide operating frequency band and low mechanical damping, greatly improving energy harvesting capability and versatility. The coaxial transmission mechanism ensures the compactness between the components, small size, high space utilization, and can be worn by the human body or moving objects to collect mechanical energy generated by motion, possessing good portability.

[0043] Example 2, a preferred embodiment of a portable mechanical energy harvesting device based on triboelectric nanogenerator technology, differs from Example 1 in that it includes a connected transmission unit 1 and a power generation unit 2. The transmission unit 1 includes a compound pendulum 6, a one-way clutch 7, and a speed-increasing gear set 8 connected in sequence. The power generation unit 2 includes a rotor 3 with a friction layer and a stator 4 with an electrode layer. Under external force, the compound pendulum 6 drives the one-way clutch 7 and the speed-increasing gear set 8 to rotate, and the rotor 3 rotates synchronously with the speed-increasing gear set 8. This invention is applied to harvesting low-frequency, random mechanical energy in the environment and converting it into electrical energy to power micro-devices, avoiding the use of an external power source. The unique transmission mechanism can convert external low-frequency mechanical motion into unidirectional high-speed rotation of the rotor, generating ultra-high frequency output and significantly improving energy harvesting efficiency. This device can harvest the energy of angular rotational motion in the direction of the rotating shaft, has a wide operating frequency band and low mechanical damping, greatly improving energy harvesting capability and versatility. The coaxial transmission mechanism ensures the compactness between the components, small size, high space utilization, and can be worn by the human body or moving objects to harvest mechanical energy generated by motion, possessing good portability.

[0044] Based on the above implementation methods, such as Figure 3 , Figure 4 As shown, the compound pendulum 6 includes a pendulum rod 9, the lower end of which is connected to an arc-shaped pendulum hammer 10. The upper end of the pendulum rod 9 is provided with a bearing 11 through which the shaft rod 5 passes. The pendulum rod 9 is connected to the one-way clutch 7. The upper end of the pendulum rod 9 is provided with a bearing 11 through which the shaft rod 5 passes, and the outer periphery of the bearing 11 is provided with a boss 12 that connects to the one-way clutch 7.

[0045] Preferably, the circular pendulum 10 is designed as a fan-shaped ring to maximize the rotational inertia by positioning the center as far outward as possible, thereby enhancing the oscillation effect. The boss 12 is annularly protruding around the bearing 11 and is connected to the one-way clutch 7, while maintaining a gap between the compound pendulum 6 and the one-way clutch 7 to prevent collision.

[0046] Based on the above implementation methods, such as Figure 5 As shown, the one-way clutch 7 is connected to the rocker arm 9 via the inner wheel 14. The outer ring 15 is sleeved on the outer periphery of the inner wheel 14. A roller 16 is provided between the outer ring 15 and the inner wheel 14. The inner wheel 14 swings along the inner wall of the outer ring 15 with the rocker arm 9.

[0047] Specifically, such as Figure 6 As shown, a protrusion is provided along the centerline of the inner wall of the outer ring 15, and a groove is provided on the outer circumferential surface of the inner wheel 14 to engage with the protrusion. The inner wheel 14 rotates along the inner wall of the outer ring 15.

[0048] Based on the above embodiment, the inner wheel 14 is provided with a groove 17 for placing the roller 16. The size of one end of the groove 17 is larger than the diameter of the roller 16, and the size of the other end of the groove 17 is smaller than the diameter of the roller 16. When the inner wheel 14 rotates in the forward direction, there is a gap between the roller 16 and the inner wheel 14 and the outer ring 15. The outer ring 15 does not rotate with the inner wheel 14. When the inner wheel 14 rotates in the reverse direction, the roller 16 is engaged between the inner wheel 14 and the outer ring 15. The outer ring 15 rotates with the inner wheel 14, converting the external oscillation into unidirectional continuous rotation.

[0049] Specifically, a second protrusion is provided on the bottom surface of the groove 17, and a second groove is provided on the side circumferentially of the roller 16 to cooperate with the second protrusion. The roller 16 is disposed between the first protrusion and the second protrusion and rolls.

[0050] Based on the above implementation method, the inner wheel 14 is provided with a plurality of slots 17.

[0051] Preferably, three slots 17 are provided, which are evenly distributed around the inner wheel 14.

[0052] Based on the above embodiments, the speed-increasing gear set 8 includes an internal gear ring 19 connected to the outer ring 15, a main gear 21 coaxially connected to the internal gear ring 19, and a transition gear 22 meshing between the main gear 21 and the internal gear ring 19, such as... Figure 7 As shown, the main gear 21 is connected to the rotor 3. The main gear 21 has a hole through which the shaft 5 passes, and a boss 23 is provided on the side of the main gear 21 adjacent to the power generation unit 2. Figure 8 As shown, the second boss 23 is connected to the rotor part 3.

[0053] Specifically, a fixing rod 24 is sleeved on the shaft 5, such as... Figure 2As shown, the buckle 29 at the lower end of the fixed rod 24 is connected to the center hole 30 of the transition gear 22. The number of teeth of the internal gear ring 19 is n1, the number of teeth of the main gear 21 is n2, and the transmission ratio is n2 / n1, thereby increasing the rotational speed.

[0054] Specifically, a beam arm 18 for driving the speed-increasing gear set 8 to rotate is provided along the outer surface of the outer ring 15. The speed-increasing gear set 8 includes a locking block 20 provided along the side of the inner gear ring 19, such as... Figure 7 As shown, the locking block 20 overlaps with the beam arm 18, and the internal gear ring 19 is internally meshed with a main gear 21. The main gear 21 has a hole for the shaft 5 to pass through, and a boss 23 is provided on the side of the main gear 21 adjacent to the power generation unit 2. Figure 8 As shown, the second boss 23 is connected to the rotor part 3.

[0055] Preferably, the outer surface of the outer ring 15 is provided with four beam arms 18, and the side of the inner toothed ring 19 is provided with four locking blocks 20. The rotation of the beam arms 18 drives the locking blocks 20 to rotate synchronously, and at the same time drives the inner toothed ring 19 to rotate synchronously.

[0056] Specifically, the boss 23 on the outer side of the main gear 21 is designed to leave a gap between the rotor and the internal gear ring 19 when connecting the rotor part 3, so as to prevent collision.

[0057] Based on the above implementation methods, such as Figures 9-12 As shown, the friction layer includes a radially arranged array of PTFE films 26 disposed on the outer side of the rotor portion 3, and the electrode layer includes electrodes 27 and 28 disposed on the inner side of the stator portion 4 with equal circumferential spacing, and the outer side is attached to the inner side.

[0058] Specifically, the base of the rotor section 3 is an acrylic plate with a hole in the middle for the shaft 5 to pass through. A radially arranged PTFE film is attached to the outer surface of the rotor as a friction layer. The base of the stator section 4 is an acrylic plate with a hole in the middle for the shaft 5 to pass through. Electrodes 1 27 and 28 are both copper foil electrodes. Multiple electrodes 1 27 are electrically connected to each other, and multiple electrodes 28 are electrically connected to each other. Every two adjacent electrodes 1 27 and 28 form an electrode pair and are connected by an external circuit.

[0059] Preferably, both the rotor section 3 and the stator section 4 are circular.

[0060] Based on the above implementation methods, such as Figure 13As shown, the transmission unit 1 and the power generation unit 2 are both housed inside the housing 25. The housing 25 has a hole for the shaft 5 to pass through. The outer side of the stator part 4 is connected to the inner side of the housing 25. The stator part 4 is fixed on the inner wall of the housing 25. When the rotor part 3 rotates, it generates electricity by friction with the stator part 4.

[0061] Specifically, the housing 25 is circular and includes a body and a cover. The transmission unit 1 and the power generation unit 2 are both encapsulated in the body. The shaft 5 passes through all the components and provides support, allowing the device to rotate and generate electricity.

[0062] Based on the above embodiments, as a preferred embodiment, the rotor part 3 and the stator part 4 are both provided with a hole 3 for the shaft 5 to pass through. The bearing 11, the bearing 23 provided at the center of the inner wheel 14, the hole 1, the hole 2, and the hole 3 provided at the center of the main gear 21 are all located on the same straight line, and all components swing around the shaft 5.

[0063] This invention is applied to collecting low-frequency, random mechanical energy in the environment and converting it into electrical energy to power micro-devices, avoiding the use of an external power source. The unique transmission mechanism can convert external low-frequency mechanical motion into unidirectional high-speed rotation of the rotor, generating ultra-high frequency output and significantly improving energy harvesting efficiency. The device can collect energy from angular rotational motion in the direction of the rotating shaft, has a wide operating frequency band and low mechanical damping, greatly improving energy harvesting capability and versatility. The coaxial transmission mechanism ensures the compactness between the components, small size, high space utilization, and can be worn by the human body or moving objects to collect mechanical energy generated by motion, possessing good portability.

[0064] All aspects not detailed in this invention are conventional technical means known to those skilled in the art.

[0065] The above content shows and describes the basic principles, main features, and beneficial effects of the present invention. The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A portable mechanical energy harvesting device based on triboelectric nanogenerator technology, characterized in that: The device includes a transmission unit (1) and a power generation unit (2) connected together. The transmission unit (1) includes a compound pendulum (6), a one-way clutch (7), and a speed-increasing gear set (8) connected in sequence. The power generation unit (2) includes a rotor part (3) with a friction layer and a stator part (4) with an electrode layer. The compound pendulum (6) drives the one-way clutch (7) and the speed-increasing gear set (8) to rotate under the action of external force. The rotor part (3) rotates synchronously with the speed-increasing gear set (8). The compound pendulum (6) includes a pendulum rod (9) connected to an arc. The pendulum (10) has a bearing (11) at the upper end of the pendulum rod (9) through which the shaft rod (5) passes. The pendulum rod (9) is connected to a one-way clutch (7). The one-way clutch (7) is connected to the pendulum rod (9) via an inner wheel (14). An outer ring (15) is fitted around the outer circumference of the inner wheel (14). A roller (16) is placed between the outer ring (15) and the inner wheel (14). The inner wheel (14) swings along the inner wall of the outer ring (15) with the pendulum rod (9). A groove for placing the roller (16) is provided on the inner wheel (14). 17), the size of one end of the groove (17) is larger than the diameter of the roller (16), and the size of the other end of the groove (17) is smaller than the diameter of the roller (16). When the inner wheel (14) rotates in the forward direction, there is a gap between the roller (16), the inner wheel (14), and the outer ring (15). The outer ring (15) does not rotate with the inner wheel (14). When the inner wheel (14) rotates in the reverse direction, the roller (16) is engaged between the inner wheel (14) and the outer ring (15), and the outer ring (15) rotates with the inner wheel (14). The inner wheel (14) has a gap between the inner wheel (14) and the outer ring (15). The gear set (8) is provided with several slots (17); the speed-increasing gear set (8) includes an internal gear ring (19) connected to the outer ring (15), the internal gear ring (19) meshes with the main gear (21), and the main gear (21) is connected to the rotor (3); the speed-increasing gear set (8) includes an internal gear ring (19) connected to the outer ring (15), the internal gear ring (19) is coaxially connected to the main gear (21), the main gear (21) and the internal gear ring (19) mesh with a transition gear (22), and the main gear (21) is connected to the rotor (3).

2. The portable mechanical energy harvesting device based on triboelectric nanogenerator technology according to claim 1, characterized in that: The friction layer includes a radially arranged array of PTFE films (26) disposed on the outer side of the rotor (3), and the electrode layer includes a first electrode (27) and a second electrode (28) disposed on the inner side of the stator (4) with equal circumferential spacing, and the outer side and the inner side are attached together.

3. The portable mechanical energy harvesting device based on triboelectric nanogenerator technology according to claim 2, characterized in that: The transmission unit (1) and the power generation unit (2) are both located inside the housing (25). The housing (25) has a hole for the shaft rod (5) to pass through. The outer side of the stator part (4) is connected to the inner side of the housing (25).

4. The portable mechanical energy harvesting device based on triboelectric nanogenerator technology according to claim 3, characterized in that: The rotor (3) and stator (4) are each provided with a hole three for the shaft (5) to pass through. The bearing one (11), the bearing two (13) provided at the center of the inner wheel (14), and the holes one, two and three provided at the center of the main gear (21) are all located on the same straight line.

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