Dual-drive ultra-low-speed ocean current energy harvesting device

Abstract

The invention belongs to the technical field of micro electro mechanical system manufacturing and ocean current energy collection, and particularly relates to a dual-drive ultra-low-speed ocean current energy harvesting device which solves the problems that an existing ocean current energy collecting device is large in overall size, more depends on other forms of ocean energy such as wave energy, cannot collect low-frequency and low-speed ocean current energy in a compatible mode, and is poor in energy efficiency. The energy harvesting device comprises an internal energy harvesting structure, an external energy harvesting structure, a barrel-shaped shell and a top cover, the internal energy harvesting structure comprises a bevel gear wheel, a left bevel pinion, a right bevel pinion, a conductive slip ring, a left copper ring, a right copper ring and a semiconductor wafer; the external energy harvesting structure comprises a left turbine blade, a right turbine blade and a bottom turbine blade. Direct current is generated through friction between the conductive copper ring and the semiconductor, resistance in the friction process can be remarkably reduced, the output power density is improved, and high reliability and long endurance are achieved. The two turbine blades are adopted to adapt to different flow velocity changes, and the flexibility of energy collection is improved.

Description

Technical Field

[0001] The invention relates to the technical fields of micro-electromechanical system manufacturing technology and ocean current energy collection, and in particular to a dual-drive ultra-low-speed ocean current energy harvesting device. Background Art

[0002] Energy issues have always been a key bottleneck restricting the sustainable development of human society. As a clean energy with huge potential, ocean energy has a broad application space and mature development technology, making it an ideal choice to replace non-renewable energy.

[0003] Among them, ocean current energy, as an important form of ocean energy, has become a focus of ocean energy development with its advantages of high energy density, strong predictability and low environmental impact. The friction nanogenerator (TENG) is based on triboelectricity and electrostatic induction effects and is very sensitive to tiny changes in mechanical energy. This enables it to effectively capture tiny kinetic energy in ocean currents and improve energy conversion efficiency. Compared with traditional ocean current energy generators, friction nanogenerators have the advantages of small size, simple structure and low cost, which are conducive to modular design and integration, convenient for large-scale deployment in the marine environment, and more suitable for the development and utilization of ocean energy. At present, people have manufactured a variety of friction nanogenerators for collecting ocean blue energy. For example, patent application CN118399567A proposes a device for collecting ocean current energy for manta ray-like submersibles; patent application CN118532287A proposes a box-type ocean energy collection device; patent application CN118457838A proposes an offshore photovoltaic wave current power generation platform.

[0004] Through the summary and analysis of the above-mentioned ocean current energy collection devices, it is found that most of the existing ocean current energy collection devices use polymer materials such as polytetrafluoroethylene (PTFE), polyethylene (PE), and polypropylene (PP) as friction layer materials. Their high internal resistance makes the device output power low, and it is impossible to output AC power continuously at the same time. This requires the power generation device to integrate a rectifier module and an energy storage module, and the entire device is large in size. In addition, most of the current ocean current energy collection devices are composite collection devices, which rely more on other forms of ocean energy such as wave energy and are not compatible with the collection of low-frequency and low-speed ocean current energy. And due to the choice of friction layer materials, it is impossible to work at high intensity for a long time, and therefore cannot meet the demand for high reliability and long-endurance ocean energy. Therefore, it is extremely important to invent an ocean in-situ power generation technology that can simultaneously have low-speed start-up, reliability, and long endurance to solve energy problems. Summary of the invention

[0005] In order to overcome the technical defects of existing ocean current energy collection devices, such as large overall size, greater reliance on other forms of ocean energy such as wave energy, incompatibility with the collection of low-frequency and low-speed ocean current energy, and inability to work at high intensity for a long time, the present invention provides a dual-drive ultra-low-speed ocean current energy capture device; the device has a low starting speed, good ocean current adaptability and high output performance.

[0006] The present invention provides a dual-drive ultra-low-speed ocean current energy capture device, comprising an internal energy capture structure, an external energy capture structure, a barrel-shaped shell and a top cover; the internal energy capture structure comprises a large bevel gear, a left small bevel gear, a right small bevel gear, a conductive slip ring, a left copper ring, a right copper ring and a semiconductor wafer, the axis of the large bevel gear is located in a vertical direction, the semiconductor wafer is attached to the top surface of the large bevel gear, the conductive slip ring is supported above the semiconductor wafer by a slip ring bracket, the conductive slip ring is connected to the electrode of the semiconductor wafer, the left copper ring and the right copper ring are connected by a copper rod, the copper rod is placed on the conductive slip ring, the left copper ring and the right copper ring are symmetrically arranged about the conductive slip ring, the left small bevel gear and the right small bevel gear are respectively located at the left and right ends of the copper rod, and the left small bevel gear and the right small bevel gear are both meshed with the large bevel gear; the internal energy capture structure is installed inside the barrel-shaped shell, and the slip ring bracket is connected to the barrel-shaped external The inner wall of the shell is fixedly connected, and the top cover is fixedly connected to the top of the barrel-shaped shell; the external energy-capturing structure includes a left turbine blade, a right turbine blade and a bottom turbine blade, the left turbine blade is penetrated and fixed with a left hexagonal shaft, the right turbine blade is penetrated and fixed with a right hexagonal shaft, and the bottom turbine blade is penetrated and fixed with a vertical hexagonal shaft, and corresponding positions of the barrel-shaped shell are provided with avoidance holes for avoiding the left hexagonal shaft, the right hexagonal shaft and the vertical hexagonal shaft, the left hexagonal shaft passes through the avoidance hole and then penetrates into the left small bevel gear and the two are fixed, and the left hexagonal shaft is connected to the left small bevel gear through a flange bearing; the right hexagonal shaft passes through the avoidance hole and then penetrates into the right small bevel gear and the two are fixed, and the right hexagonal shaft is connected to the right small bevel gear through a flange bearing; the vertical hexagonal shaft passes through the avoidance hole and then penetrates into the large bevel gear and the two are fixed, and the vertical hexagonal shaft is connected to the large bevel gear through a flange bearing.

[0007] The external energy capture structure is designed to optimize the efficiency of capturing ocean current energy; in the internal energy capture structure, the bevel gear design adopts a structure in which large and small bevel gears are nested with each other, ensuring that under low-speed conditions, the small bevel gears on the left and right can effectively drive the large bevel gear, thereby increasing the output torque and improving the ultra-low-speed starting capability. Under medium and high-speed ocean current conditions, the bottom turbine blade uses its high energy conversion efficiency to enable the large bevel gear to drive the small bevel gears on the left and right, thereby enhancing the overall output performance of the ocean current energy harvester. To avoid wire entanglement, a conductive slip ring is fixed above the semiconductor wafer through a support frame, and the conductive slip ring is connected to the electrode on the semiconductor wafer. The wire uses a copper rod to connect the two copper rings, which not only plays a supporting role, but also has the function of a wire, further avoiding the problem of wire entanglement. The left turbine blade has a hexagonal through hole that matches the left hexagonal shaft, and the two ends of the left hexagonal shaft are respectively connected with screws for fixing the left turbine blade and the left small bevel gear. The right turbine blade has a hexagonal through hole that matches the right hexagonal shaft, and the two ends of the right hexagonal shaft are respectively connected with screws for fixing the right turbine blade and the right small bevel gear. The vertical turbine blade has a hexagonal through hole that matches the vertical hexagonal shaft, and the two ends of the vertical hexagonal shaft are respectively connected with screws for fixing the vertical turbine blade and the large bevel gear.

[0008] Preferably, the left turbine blade and the right turbine blade are both Savonius turbine blades, and the bottom turbine blade is a Kaplan turbine blade. Savonius turbine blades have good low-speed capture capabilities, while Kaplan turbine blades perform well under medium and high-speed flow conditions. The coupling of the two can adapt to different flow rate changes and improve the flexibility of energy collection.

[0009] Preferably, the slip ring bracket includes a support tube for mounting the conductive slip ring and two horizontal support arms, the two horizontal support arms are symmetrically connected to the two sides of the support tube and are integrally formed with the support tube, the conductive slip ring is located in the support tube, and the outer ends of the horizontal support arms are fixedly connected to the inside of the barrel-shaped shell by bolts. Such a setting structure is reasonable.

[0010] Compared with the prior art, the technical solution provided by the present invention has the following technical effects: the present invention proposes a dual-drive ultra-low-speed ocean current energy harvesting device based on the friction voltaic effect, which generates direct current through friction between a conductive copper ring and a semiconductor, which can significantly reduce the resistance during the friction process, improve the output power density, and achieve high reliability and long endurance. This device achieves efficient collection of low-frequency and low-speed ocean current energy through structural design and process optimization; and the internal resistance of the entire energy harvester is significantly reduced, and the response effect to ultra-low-speed ocean currents is good; Savonius-type turbine blades and Kaplan-type turbine blades are used, and the coupling of the two can adapt to different flow rate changes and improve the flexibility of energy harvesting. In addition, through the MEMS process and the molten deposition rapid prototyping 3D printing process, the energy harvesting device can form a distributed ocean current energy collection array, combined with the back-end energy management circuit and energy scheduling algorithm, it is expected to achieve large-scale application of renewable ocean energy on a global scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 It is a schematic diagram of the overall structure of a dual-drive ultra-low-speed ocean current energy harvesting device described in a certain embodiment of the present invention; Figure 2 It is a schematic structural diagram of a dual-drive ultra-low-speed ocean current energy harvesting device described in a certain embodiment of the present invention after removing the barrel-shaped outer shell and the top cover; Figure 3 It is a schematic diagram of the explosion structure of a dual-drive ultra-low-speed ocean current energy harvesting device described in a certain embodiment of the present invention; Figure 4 A schematic diagram of the structure of a Savonius turbine blade in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a Kaplan-type turbine blade in an embodiment of the present invention; Figure 6 It is a schematic diagram of the structure of the barrel-shaped shell in an embodiment of the present invention.

[0014] In the figure: 1. barrel-shaped shell; 2. top cover; 3. large bevel gear; 4. small bevel gear on the left; 5. small bevel gear on the right; 6. conductive slip ring; 7. left copper ring; 8. right copper ring; 9. semiconductor wafer; 10. slip ring bracket; 11. copper rod; 12. left turbine blade; 13. right turbine blade; 14. bottom turbine blade; 15. left hexagonal shaft; 16. right hexagonal shaft; 17. vertical hexagonal shaft; 18. avoidance hole; 19. flange bearing. DETAILED DESCRIPTION

[0015] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0016] In the description, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0018] The following is combined with Figures 1 to 6 The specific embodiments of the present invention are described in detail.

[0019] In one embodiment, Figure 1As shown, a dual-drive ultra-low-speed ocean current energy capture device includes an internal energy capture structure, an external energy capture structure, a barrel-shaped shell 1 and a top cover 2; the internal energy capture structure includes a large bevel gear 3, a left small bevel gear 4, a right small bevel gear 5, a conductive slip ring 6, a left copper ring 7, a right copper ring 8 and a semiconductor wafer 9, the axis of the large bevel gear 3 is located in the vertical direction, the semiconductor wafer 9 is attached to the top surface of the large bevel gear 3, the conductive slip ring 6 is supported above the semiconductor wafer 9 by a slip ring bracket 10, and the conductive slip ring 6 is connected to the electrode of the semiconductor wafer 9, the left copper ring 7 and the right copper ring 8 are connected by a copper rod 11, the copper rod 11 is placed on the conductive slip ring 6, the left copper ring 7 and the right copper ring 8 are symmetrically arranged about the conductive slip ring 6, the left small bevel gear 4 and the right small bevel gear 5 are respectively located at the left and right ends of the copper rod 11, and the left small bevel gear 4 and the right small bevel gear 5 are both meshed with the large bevel gear 3; the internal energy capture structure is installed inside the barrel-shaped shell 1, and the slip ring bracket 10 is fixedly connected to the inner wall of the barrel-shaped shell 1, and the top cover 2 is connected to the inner wall of the barrel-shaped shell 1. The outer energy-capturing structure comprises a left turbine blade 12, a right turbine blade 13 and a bottom turbine blade 14. The left turbine blade 12 is penetrated and fixed with a left hexagonal shaft 15, the right turbine blade 13 is penetrated and fixed with a right hexagonal shaft 16, the bottom turbine blade 14 is penetrated and fixed with a vertical hexagonal shaft 17, and a corresponding position of the barrel-shaped shell 1 is provided with an avoidance hole 18 for avoiding the left hexagonal shaft 15, the right hexagonal shaft 16 and the vertical hexagonal shaft 17. The shaft 15 passes through the avoidance hole 18 and then penetrates into the left small bevel gear 4 and the two are fixed. The left hexagonal shaft 15 is connected to the left small bevel gear 4 through a flange bearing 19; the right hexagonal shaft 16 passes through the avoidance hole 18 and then penetrates into the right small bevel gear 5 and the two are fixed. The right hexagonal shaft 16 is connected to the right small bevel gear 5 through a flange bearing 19; the vertical hexagonal shaft 17 passes through the avoidance hole 18 and then penetrates into the large bevel gear 3 and the two are fixed. The vertical hexagonal shaft 17 is connected to the large bevel gear 3 through a flange bearing 19.

[0020] The external energy capture structure is designed to optimize the efficiency of capturing ocean current energy; in the internal energy capture structure, the bevel gear design adopts a structure in which large and small bevel gears are nested with each other, ensuring that under low-speed conditions, the left small bevel gear 4 and the right small bevel gear 5 can effectively drive the large bevel gear 3, thereby increasing the output torque and improving the ultra-low-speed starting capability. Under medium and high-speed ocean current conditions, the bottom turbine blade uses its high energy conversion efficiency to enable the large bevel gear 3 to drive the left small bevel gear 4 and the right small bevel gear 5, thereby enhancing the overall output performance of the ocean current energy harvester. To avoid wire winding, a conductive slip ring 6 is fixed above the semiconductor wafer 9 through a support frame, and the conductive slip ring 6 is connected to the electrode on the semiconductor wafer 9. The wire uses a copper rod 11 to connect the two copper rings, which not only plays a supporting role, but also has the function of a wire, further avoiding the problem of wire winding. The left turbine blade 12 has a hexagonal through hole adapted to the left hexagonal shaft 15, and the two ends of the left hexagonal shaft 15 are respectively connected with screws for fixing the left turbine blade 12 and the left small bevel gear 4. The right turbine blade 13 has a hexagonal through hole adapted to the right hexagonal shaft 16, and the two ends of the right hexagonal shaft 16 are respectively connected with screws for fixing the right turbine blade 13 and the right small bevel gear 5, and the vertical turbine blade has a hexagonal through hole adapted to the vertical hexagonal shaft 17, and the two ends of the vertical hexagonal shaft 17 are respectively connected with screws for fixing the vertical turbine blade and the large bevel gear 3. Specifically, the structure can be designed by 3D modeling software, and then processed and prepared by 3D printing FDM technology to ensure its surface smoothness and geometric accuracy.

[0021] On the basis of the above embodiment, in a preferred embodiment, the left turbine blade 12 and the right turbine blade 13 are both Savonius turbine blades, and the bottom turbine blade 14 is a Kaplan turbine blade. The Savonius turbine blade has good low-speed capture capability, while the Kaplan turbine blade performs well under medium and high-speed flow conditions. The coupling of the two can adapt to different flow rate changes and improve the flexibility of energy collection.

[0022] On the basis of the above embodiments, in a preferred embodiment, the slip ring bracket 10 includes a support tube for mounting the conductive slip ring 6 and two horizontal support arms, the two horizontal support arms are symmetrically connected to both sides of the support tube and are integrally formed with the support tube, the conductive slip ring 6 is located in the support tube, and the outer ends of the horizontal support arms are fixedly connected to the inside of the barrel-shaped housing 1 by bolts. Such a setting structure is reasonable.

[0023] The above is only a specific implementation of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions are given with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A dual-drive ultra-low-speed ocean current energy capture device, characterized in that: It comprises an internal energy-capturing structure, an external energy-capturing structure, a barrel-shaped shell (1) and a top cover (2); The internal energy capture structure comprises a large bevel gear (3), a left small bevel gear (4), a right small bevel gear (5), a conductive slip ring (6), a left copper ring (7), a right copper ring (8) and a semiconductor wafer (9), wherein the axis of the large bevel gear (3) is located in a vertical direction, the semiconductor wafer (9) is attached to the top surface of the large bevel gear (3), the conductive slip ring (6) is supported above the semiconductor wafer (9) by a slip ring bracket (10), and the conductive slip ring (6) is connected to an electrode of the semiconductor wafer (9); the left copper ring (7) and the right copper ring (8) are connected by a copper rod (11), the copper rod (11) is placed on the conductive slip ring (6), the left copper ring (7) and the right copper ring (8) are symmetrically arranged with respect to the conductive slip ring (6), the left small bevel gear (4) and the right small bevel gear (5) are respectively located at the left and right ends of the copper rod (11), and the left small bevel gear (4) and the right small bevel gear (5) are both meshed with the large bevel gear (3); The internal energy capture structure is installed inside the barrel-shaped outer shell (1), the slip ring bracket (10) is fixedly connected to the inner wall of the barrel-shaped outer shell (1), and the top cover (2) is fixedly connected to the top of the barrel-shaped outer shell (1); The external energy capture structure comprises a left turbine blade (12), a right turbine blade (13) and a bottom turbine blade (14); a left hexagonal shaft (15) is inserted and fixedly disposed on the left turbine blade (12); a right hexagonal shaft (16) is inserted and fixedly disposed on the right turbine blade (13); a vertical hexagonal shaft (17) is inserted and fixedly disposed on the bottom turbine blade (14); and a corresponding position of the barrel-shaped housing (1) is provided with an avoidance hole (18) for avoiding the left hexagonal shaft (15), the right hexagonal shaft (16) and the vertical hexagonal shaft (17). The left hexagonal shaft (15) passes through the avoidance hole (18). ) and then penetrates into the left small bevel gear (4) and the two are fixed, and the left hexagonal shaft (15) is connected to the left small bevel gear (4) through a flange bearing (19); the right hexagonal shaft (16) penetrates into the right small bevel gear (5) through the avoidance hole (18) and the two are fixed, and the right hexagonal shaft (16) is connected to the right small bevel gear (5) through a flange bearing (19); the vertical hexagonal shaft (17) penetrates into the large bevel gear (3) through the avoidance hole (18) and the two are fixed, and the vertical hexagonal shaft (17) is connected to the large bevel gear (3) through a flange bearing (19).

2. A dual-drive ultra-low-speed ocean current energy harvesting device according to claim 1, characterized in that: The left turbine blade (12) and the right turbine blade (13) are both Savonius type turbine blades, and the bottom turbine blade (14) is a Kaplan type turbine blade.

3. A dual-drive ultra-low-speed ocean current energy harvesting device according to claim 2, characterized in that: The slip ring bracket (10) comprises a support tube for mounting a conductive slip ring (6) and two horizontal support arms, the two horizontal support arms being symmetrically connected to two sides of the support tube and being integrally formed with the support tube, the conductive slip ring (6) being located in the support tube, and the outer ends of the horizontal support arms being fixedly connected to the interior of the barrel-shaped outer shell (1) by bolts.

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