Nested composite friction nanometer generator

Abstract

According to the nested composite friction nano-generator provided by the invention, a plurality of friction discs are embedded in the outer side of a liquid-solid friction nano-power generation tube core, and the friction discs are put into a box body as a whole, so that on one hand, for a liquid-solid friction part, through a multi-tube nested structure, a liquid motion path is optimized, and an effective friction area is increased; therefore, the energy conversion efficiency is improved; on the other hand, the 3D printing box body and disc supporting design is adopted as a whole, a dual-friction power generation mechanism is introduced, a power generation tube core drives a disc to do reciprocating motion under wave driving, and therefore efficient and stable energy collection in all directions is achieved through solid-solid friction power generation on the outer edge; the device can effectively improve the power generation efficiency, is suitable for low-power-consumption application scenes such as buoys, offshore monitoring equipment and ocean micro equipment, conforms to the green energy development direction, and has wide application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of wave energy power generation, and more particularly to a nested composite friction nanogenerator. Background Art

[0002] The development of efficient, clean, and renewable energy technologies has become a global research priority. Ocean wave energy, as a vast and widespread renewable energy source, plays a crucial role in the future energy mix because it is unaffected by day and night, seasons, and weather. However, traditional wave energy harvesting technologies rely primarily on electromagnetic induction, hydraulic mechanical devices, or float-based power generation systems. These technologies suffer from complex structures, high maintenance costs, and low energy conversion efficiency, limiting their widespread adoption in large-scale ocean energy applications.

[0003] In recent years, triboelectric nanogenerators (TENGs) have become a research hotspot in ocean wave energy harvesting technology due to their high power density, lightweight, low cost, and environmentally friendly characteristics. The basic principle of TENG is based on the triboelectric effect and electrostatic induction, achieving efficient conversion of mechanical energy into electrical energy through periodic contact and separation or relative sliding. Liquid-solid triboelectric nanogenerators (LS TENGs) are an important type of TENG. They use the dynamic contact and separation of liquid and solid surfaces to drive charge transfer between electrodes, thereby achieving energy harvesting. Compared with traditional solid-solid triboelectric TENGs, liquid-solid TENGs have stronger corrosion resistance, more stable output performance, and longer operating life in marine environments.

[0004] Currently, there has been some research on liquid-solid TENGs for wave energy harvesting, primarily using single-tube structures or contact-separation modes for power generation. For example, some researchers exploit the reciprocating flow of liquid in a tube to harvest energy through the triboelectric effect of the tube wall, or utilize the periodic contact and separation of wave-driven solid surfaces to generate charge. However, these approaches suffer from the following issues: 1) Limited energy conversion efficiency of single-tube structures: Due to the limited contact area of a single tube, the amount of charge generated is small, limiting the energy collection capacity per unit volume. 2) Poor stability of the contact-separation mode: Conventional contact-separation TENGs are susceptible to external interference in ocean wave environments, such as wind and wave fluctuations and sediment accumulation, resulting in unstable charge accumulation and large fluctuations in output power. 3) Lack of structural optimization and inadequate utilization of the tube space: Existing designs typically employ a single layer or simple contact scheme, failing to utilize multi-layer nested tube structures to improve power generation efficiency and charge storage capacity. 4) Limited energy capture direction: Conventional tube structures can only capture axial wave energy and struggle to capture radial energy, resulting in low energy utilization. Summary of the Invention

[0005] In order to overcome the defects of low power generation efficiency and low space utilization in the above-mentioned prior art, the present invention provides a nested composite friction nanogenerator, which combines the liquid-solid friction mode and the solid-solid friction mode to realize dual friction power generation under wave drive, thereby improving the power generation efficiency. The present invention has broad application prospects in the fields of wave energy collection, self-powered ocean sensors, smart buoys, etc.

[0006] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0007] A nested composite friction nanogenerator, comprising: a box, a liquid-solid friction nanogenerator core, and a plurality of friction discs;

[0008] The box body includes an upper box body and a lower box body with symmetrical structures, and a plurality of protrusions are provided inside the upper box body and the lower box body; protrusion sensing electrodes are respectively provided on two side surfaces of each protrusion, and the protrusion sensing electrodes are covered with a first polymer material;

[0009] The liquid-solid friction nano-power generation tube core is transversely arranged on the raised portion of the lower box body and can roll back and forth within the box body;

[0010] Each of the friction discs is nested outside the liquid-solid friction nanogenerator core and embedded in a groove formed by adjacent protrusions; two symmetrical and non-contact disc sensing electrodes are respectively provided on two sides of each friction disc, and the disc sensing electrodes are covered with a second polymer material;

[0011] The first polymer material and the second polymer material have opposite polarities;

[0012] Under the action of wave energy, when the box body reciprocates laterally, the liquid-solid friction nano-power generation tube core performs liquid-solid friction power generation; when the box body reciprocates longitudinally, the liquid-solid friction nano-power generation tube core rolls back and forth in the box body, while driving the friction disc to roll back and forth in the groove, and causing the second polymer material and the first polymer material to generate solid-solid friction electricity; when the box body reciprocates vertically, the liquid-solid friction nano-power generation tube core and the friction disc move up and down, and causing the second polymer material and the first polymer material to generate solid-solid friction electricity.

[0013] Preferably, the liquid-solid friction nano-power generation tube core comprises: an outer tube, a first inner tube, a second inner tube, a friction liquid, an outer sensing electrode, a first inner sensing electrode and a second inner sensing electrode;

[0014] The outer tube, the first inner tube and the second inner tube are nested in sequence from the outside to the inside;

[0015] The friction liquid is arranged in the gap between the outer tube and the first inner tube, and in the interior of the second inner tube;

[0016] The external sensing electrode is arranged on the outer wall of the outer tube, the first internal sensing electrode is arranged on the inner wall of the first inner tube, and the second internal sensing electrode is arranged on the outer wall of the second inner tube;

[0017] When the box body moves back and forth laterally, the friction liquid rubs against the inner wall of the outer tube, the outer wall of the first inner tube, and the inner wall of the second inner tube to generate charge transfer, and induces induced charges on the external induction electrode, the first internal induction electrode, and the second internal induction electrode respectively. The induced charges are led out through external wires to generate alternating current, thereby realizing liquid-solid friction power generation.

[0018] Preferably, the outer tube, the first inner tube and the second inner tube are all made of insulating materials, and the insulating material includes any one of PTFE, PE, PP, PET, PDMS and PVC.

[0019] Preferably, the protruding sensing electrode, the disc sensing electrode, the external sensing electrode, the first internal sensing electrode and the second internal sensing electrode are all made of conductive materials, and the conductive material includes any one of copper foil, aluminum foil and conductive coating.

[0020] Preferably, the friction liquid is deionized water, magnetic fluid or aqueous solution.

[0021] Preferably, the volume of the friction liquid in the gap is less than or equal to half of the volume of the gap between the outer tube and the first inner tube;

[0022] The volume of the friction liquid inside the second inner tube is less than or equal to half of the internal volume of the second inner tube.

[0023] Preferably, the first polymer material is nylon; and the second polymer material is any one of PTFE, FEP and PI.

[0024] Preferably, the material of the friction disc is any one of acrylic, polyvinyl chloride and polyphenylene ether.

[0025] Preferably, the upper box body, the lower box body and the raised portion are manufactured based on 3D printing technology.

[0026] Preferably, the longitudinal length of the box body is the same as the circumference of the friction disc, and the vertical height is greater than the diameter of the friction disc.

[0027] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0028] The present invention provides a nested composite friction nanogenerator. On the one hand, for the liquid-solid friction part, a multi-tube nested structure is used to optimize the liquid movement path and increase the effective friction area, thereby improving the energy conversion efficiency. On the other hand, the present invention adopts a 3D printed box + disc support design as a whole, introducing a dual friction generator system. Under the drive of waves, the power generation tube core drives the disc to produce reciprocating motion, thereby utilizing solid-solid friction power generation at the outer edge to achieve efficient and stable energy collection in all directions. The present invention can effectively improve power generation efficiency and is suitable for low-power application scenarios such as buoys, offshore monitoring equipment, and ocean micro-equipment. It is in line with the development direction of green energy and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a front view of a nested composite friction nanogenerator provided in Example 1.

[0030] Figure 2 This is a left view of a nested composite friction nanogenerator provided in Example 1.

[0031] Figure 3 This is a front view of the box body 1 provided in Example 1.

[0032] Figure 4 This is a front view of the friction disc 3 provided in Example 1.

[0033] Figure 5 This is a three-dimensional cross-sectional view of the liquid-solid friction nano-power generation tube core 2 provided in Example 2.

[0034] Figure 6 This is a front view of the liquid-solid friction nano-power generation core 2 provided in Example 2.

[0035] Figure 7 This is a left side view of the liquid-solid friction nano-power generation core 2 provided in Example 2.

[0036] Figure 8 This is an overall view of eight friction disks 3 embedded on the outer side of the liquid-solid friction nano-power generation core 2 provided in Example 2.

[0037] Figure 9 This is a graph showing the output voltage and current performance of the liquid-solid friction nano-power generation core 2 provided in Example 2.

[0038] Figure 10 This is a performance diagram of output voltage and current of solid-solid friction between the box body 1 and the friction disc 3 provided in Example 2.

[0039] 1-box body; 11-upper box body; 12-lower box body; 13-raised portion; 14-raised portion sensing electrode; 15-first polymer material; 2-liquid-solid friction nanogenerator core; 21-outer tube; 22-first inner tube; 23-second inner tube; 24-friction liquid; 25-outer sensing electrode; 26-first inner sensing electrode; 27-second inner sensing electrode; 3-friction disk; 31-disc sensing electrode; 32-second polymer material. DETAILED DESCRIPTION

[0040] The accompanying drawings are for illustrative purposes only and are not to be construed as limiting the present application;

[0041] In order to better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size;

[0042] It is understandable to those skilled in the art that some well-known structures and descriptions thereof may be omitted in the drawings.

[0043] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0044] Example 1

[0045] like Figure 1 As shown, this embodiment provides a nested composite friction nanogenerator, comprising: a box body 1, a liquid-solid friction nanogenerator core 2 and a plurality of friction discs 3;

[0046] The box body 1 includes an upper box body 11 and a lower box body 12 with symmetrical structures. A plurality of protrusions 13 are provided inside the upper box body 11 and the lower box body 12. Each protrusion 13 has protrusion sensing electrodes 14 provided on both sides thereof. The protrusion sensing electrodes 14 are covered with a first polymer material 15.

[0047] The liquid-solid friction nano-power generation tube core 2 is transversely arranged on the protrusion 13 of the lower box body 12 and can roll back and forth in the box body 1;

[0048] Each friction disc 3 is nested outside the liquid-solid friction nanogenerator core 2 and embedded in a groove formed by adjacent protrusions 13. Two symmetrical and non-contact disc sensing electrodes 31 are respectively provided on the two sides of each friction disc 3. The disc sensing electrodes 31 are covered with a second polymer material 32.

[0049] The first polymer material 15 and the second polymer material 32 have opposite polarities;

[0050] Under the action of wave energy, when the box body 1 reciprocates laterally, the liquid-solid friction nano-power generation tube core 2 performs liquid-solid friction power generation; when the box body 1 reciprocates longitudinally, the liquid-solid friction nano-power generation tube core 2 rolls back and forth in the box body 1, while driving the friction disc 3 to roll back and forth in the groove, and causing the second polymer material 32 and the first polymer material 15 to generate solid-solid friction power; when the box body 1 reciprocates vertically, the liquid-solid friction nano-power generation tube core 2 and the friction disc 3 move up and down, and causing the second polymer material 32 and the first polymer material 15 to generate solid-solid friction power.

[0051] In the specific implementation process, Figure 2 , which is a left view of the nested composite triboelectric nanogenerator provided in this embodiment;

[0052] like Figure 3 As shown, the box body 1 includes an upper box body 11 and a lower box body 12 with symmetrical structures. A plurality of protrusions 13 are provided inside the upper box body 11 and the lower box body 12. The protrusions 13 are used to support the liquid-solid friction nano-power generation tube core 2 on the one hand, and to form grooves to accommodate the friction disk 3 on the other hand. In this embodiment, the spacing between two adjacent protrusions 13 can be flexibly adjusted as needed. In addition, protrusion sensing electrodes 14 are provided on both sides of each protrusion 13, and the protrusion sensing electrodes 14 are covered with a first polymer material 15.

[0053] like Figure 4 As shown, each friction disc 3 has a circular hole in its center for being nested outside the liquid-solid friction nanogenerator core 2. At the same time, each friction disc 3 is embedded in a groove formed by adjacent protrusions 13. Two symmetrical and non-contact disc sensing electrodes 31 are respectively provided on the two sides of each friction disc 3. The disc sensing electrodes 31 are covered with a second polymer material 32.

[0054] In this embodiment, the first polymer material 15 and the second polymer material 32 are materials with opposite polarities. They can generate charge transfer by friction with each other, and the charge is extracted by the corresponding induction motor to realize solid-solid triboelectric power generation. At the same time, the liquid-solid triboelectric nano-generator core 2 can generate liquid-solid triboelectric power by swinging left and right.

[0055] The generator in this embodiment can achieve dual friction power generation and can collect wave energy in all directions, including up and down, left and right, and front and back. The specific power generation process is as follows:

[0056] Under the action of wave energy, when the box body 1 moves back and forth horizontally (left and right), the liquid-solid friction nano-power generation tube core 2 swings left and right, and liquid-solid friction power generation is performed at this time;

[0057] When the box body 1 reciprocates longitudinally (forward and backward), the liquid-solid friction nano-power generation tube core 2 rolls back and forth inside the box body 1, and at the same time drives the friction disc 3 to roll back and forth in the groove, causing the second polymer material 32 and the first polymer material 15 to rub against each other. The generated charge is discharged through the protruding sensing electrode 14 and the disc sensing electrode 31, realizing solid-solid friction power generation;

[0058] When the box body 1 reciprocates vertically (up and down), the liquid-solid friction nano-power generation tube core 2 and the friction disk 3 move up and down, causing the second polymer material 32 to rub against the first polymer material 15. The generated charge is discharged through the protruding portion sensing electrode 14 and the disk sensing electrode 31, realizing solid-solid friction power generation;

[0059] The generator provided in this embodiment is designed with a multi-grooved shell, which helps to improve contact and separation stability and enhance power generation efficiency. At the same time, a liquid-solid friction TENG is embedded in the central axis of the solid-solid TENG, and the wave-driven swinging effect is used to further improve the energy collection capability in different directions, thereby realizing a dual friction power generation mode.

[0060] Example 2

[0061] This embodiment provides a nested composite friction nanogenerator, comprising: a box body 1, a liquid-solid friction nanogenerator core 2, and a plurality of friction discs 3;

[0062] The box body 1 includes an upper box body 11 and a lower box body 12 with symmetrical structures. A plurality of protrusions 13 are provided inside the upper box body 11 and the lower box body 12. Each protrusion 13 has protrusion sensing electrodes 14 provided on both sides thereof. The protrusion sensing electrodes 14 are covered with a first polymer material 15.

[0063] The liquid-solid friction nano-power generation tube core 2 is transversely arranged on the protrusion 13 of the lower box body 12 and can roll back and forth in the box body 1;

[0064] Each friction disc 3 is nested outside the liquid-solid friction nanogenerator core 2 and embedded in a groove formed by adjacent protrusions 13. Two symmetrical and non-contact disc sensing electrodes 31 are respectively provided on the two sides of each friction disc 3. The disc sensing electrodes 31 are covered with a second polymer material 32.

[0065] The first polymer material 15 and the second polymer material 32 have opposite polarities;

[0066] Under the action of wave energy, when the box body 1 reciprocates laterally, the liquid-solid friction nano-generator core 2 performs liquid-solid friction power generation; when the box body 1 reciprocates longitudinally, the liquid-solid friction nano-generator core 2 rolls back and forth in the box body 1, and at the same time drives the friction disc 3 to roll back and forth in the groove, and causes the second polymer material 32 and the first polymer material 15 to perform solid-solid friction power generation; when the box body 1 reciprocates vertically, the liquid-solid friction nano-generator core 2 and the friction disc 3 move up and down, and causes the second polymer material 32 and the first polymer material 15 to perform solid-solid friction power generation;

[0067] The liquid-solid friction nano-power generation tube core 2 includes: an outer tube 21, a first inner tube 22, a second inner tube 23, a friction liquid 24, an outer sensing electrode 25, a first inner sensing electrode 26 and a second inner sensing electrode 27;

[0068] The outer tube 21, the first inner tube 22 and the second inner tube 23 are sequentially nested from the outside to the inside;

[0069] The friction liquid 24 is disposed in the gap between the outer tube 21 and the first inner tube 22 , and inside the second inner tube 23 ;

[0070] The external sensing electrode 25 is disposed on the outer wall of the outer tube 21 , the first internal sensing electrode 26 is disposed on the inner wall of the first inner tube 22 , and the second internal sensing electrode 27 is disposed on the outer wall of the second inner tube 23 ;

[0071] When the box body 1 moves back and forth laterally, the friction liquid 24 rubs against the inner wall of the outer tube 21, the outer wall of the first inner tube 22, and the inner wall of the second inner tube 23 to generate charge transfer, and induces induced charges on the external induction electrode 25, the first internal induction electrode 26, and the second internal induction electrode 27 respectively. The induced charges are led out through external wires to generate alternating current, thereby realizing liquid-solid friction power generation;

[0072] The outer tube 21, the first inner tube 22 and the second inner tube 23 are all made of insulating material, and the insulating material includes any one of PTFE, PE, PP, PET, PDMS and PVC. In this embodiment, PTFE is used;

[0073] The protruding sensing electrode 14, the disc sensing electrode 31, the external sensing electrode 25, the first internal sensing electrode 26 and the second internal sensing electrode 27 are all made of conductive materials, including any one of copper foil, aluminum foil and conductive coating. In this embodiment, copper foil is used.

[0074] The friction liquid 24 is specifically deionized water, magnetic fluid or aqueous solution, and in this embodiment, it is deionized water;

[0075] The volume of the friction liquid 24 in the gap is less than or equal to half of the volume of the gap between the outer tube 21 and the first inner tube 22;

[0076] The volume of the friction liquid 24 inside the second inner tube 23 is less than or equal to half of the internal volume of the second inner tube 23;

[0077] The first polymer material 15 is specifically nylon; the second polymer material 32 is specifically any one of PTFE, FEP and PI, and in this embodiment is PTFE;

[0078] The material of the friction disc 3 is specifically any one of acrylic, polyvinyl chloride and polyphenylene ether, and in this embodiment, acrylic;

[0079] The upper box body 11, the lower box body 12 and the raised portion 13 are manufactured based on 3D printing technology;

[0080] The longitudinal length of the box body 1 is the same as the circumference of the friction disc 3 , and the vertical height is greater than the diameter of the friction disc 3 .

[0081] In the specific implementation process, in this embodiment, the box body 1 is made by 3D printing, and its dimensions are 28.27 cm long (the diameter of the friction disc 3 is 9 cm, and the circumference is the same as the length of the box body 1) and 10 cm high;

[0082] The box body 1 is made up of two half-boxes, each 5 cm high at both ends. Inside, there are multiple 1 cm wide grooves, with 1 cm wide protrusions 13 between adjacent grooves. The grooves are 3 cm high. The protrusions 13 are used to secure the liquid-solid triboelectric nanogenerator die 2, while the grooves accommodate the friction disc 3. In this embodiment, one half-box has stretchable corners, while the other has female holes, forming a letter interface for fixed connection. After the two boxes are spliced together, a structure 10 cm high is formed. Finally, a layer of copper foil (i.e., the protrusion sensing electrode 14) is first attached to both sides of each protrusion 13, followed by a nylon film (i.e., the first polymer material 15) to ensure the stability of the friction area.

[0083] In this embodiment, Figures 5-7 As shown, they are a three-dimensional cross-sectional view, a front view, and a left view of the liquid-solid friction nano-power generation tube core 2, and its structure includes: an outer tube 21, a first inner tube 22, a second inner tube 23, a friction liquid 24, an outer sensing electrode 25, a first inner sensing electrode 26, and a second inner sensing electrode 27;

[0084] The outer tube 21, the first inner tube 22, and the second inner tube 23 are nested and arranged in sequence from the outside to the inside; the friction liquid 24 is disposed in the gap between the outer tube 21 and the first inner tube 22, and inside the second inner tube 23; the external sensing electrode 25 is disposed on the outer wall of the outer tube 21, the first internal sensing electrode 26 is disposed on the inner wall of the first inner tube 22, and the second internal sensing electrode 27 is disposed on the outer wall of the second inner tube 23;

[0085] To ensure optimal power generation performance, the wall thicknesses of the outer tube 21, the first inner tube 22, and the second inner tube 23 in this embodiment are substantially the same. Furthermore, the volume of the cavity between the outer tube 21 and the first inner tube 22 is the same as the volume of the cavity inside the second inner tube 23. The power generation principle includes the following three parts:

[0086] 1) The positive and negative electrodes of the external sensing electrodes 25 are non-contactly mounted on the outer wall of the outer tube 21. When the liquid-solid triboelectric nanogenerator core 2 reciprocates along the axial direction of the outer tube 21, the friction liquid 24 between the outer tube 21 and the first inner tube 22 rubs against the inner wall of the outer tube 21, generating charge transfer and inducing opposite charges on the external sensing electrodes 25. The charges are then led out through external wires.

[0087] 2) The positive and negative electrodes of the first internal sensing electrode 26 are non-contactly mounted on the inner wall of the first inner tube 22. When the liquid-solid friction nanogenerator core 2 reciprocates along the axial direction of the outer tube 21, the friction liquid 24 between the outer tube 21 and the first inner tube 22 rubs against the outer wall of the first inner tube 22, generating charge transfer and inducing opposite charges on the first internal sensing electrode 26. The charges are then led out through external wires.

[0088] 3) The positive and negative electrodes of the second internal sensing electrode 27 are non-contactingly disposed on the outer wall of the second inner tube 23. When the liquid-solid friction nanogenerator core 2 reciprocates along the axial direction of the outer tube 21, the friction liquid 24 inside the second inner tube 23 rubs against the inner wall of the second inner tube 23, generating charge transfer and inducing opposite charges on the second internal sensing electrode 27, which are finally led out through external wires.

[0089] The liquid-solid friction nanogenerator core 2 in this embodiment is provided with three sets of liquid-solid friction contact surfaces. Friction generates charge transfer, which in turn induces opposite charges on the corresponding electrodes. These charges are respectively led out by wires connected to the three sets of electrodes, ultimately outputting alternating current.

[0090] The friction disc 3 in this embodiment is a 9cm diameter circular plate with a 30mm circular hole in the center (for mounting the coaxial liquid-solid triboelectric nanogenerator core 2). After the liquid-solid triboelectric nanogenerator core 2 is fixed in the circular hole, it is caused to swing under the propulsion of waves, realizing liquid-solid interface triboelectric power generation. Copper foil electrodes are attached to the outer edge of the friction disc 3 to collect charge, and then a layer of PTFE membrane is attached. Under the vertical rise and fall and back and forth motion of waves, it is used for solid-solid triboelectric power generation.

[0091] like Figure 8 As shown, in this embodiment, eight friction discs 3 are embedded on the outside of the liquid-solid friction nanogenerator core 2, which is placed as a whole in a 3D-printed box body 1. When the box body 1 swings back and forth with the waves, it can push the friction discs 3 to roll back and forth, performing solid-solid friction power generation. When the box body 1 swings left and right, it can push the liquid-solid friction nanogenerator core 2 to perform liquid-solid friction power generation. When the box body 1 swings up and down, it can drive the friction discs 3 to move up and down in the groove, performing solid-solid friction power generation.

[0092] During solid-solid friction, the nylon film easily gains electrons and becomes positively charged, while the PTFE easily loses electrons and becomes negatively charged. This heterogeneous combination of materials further improves the output voltage and power density, achieving efficient charge transfer.

[0093] In this embodiment, the design length of the box body 1 matches the circumference of the friction discs 3, ensuring that when pushed by waves, multiple friction discs 3 can periodically contact the box body 1, achieving multi-point solid-solid triboelectric power generation. At the same time, the liquid-solid triboelectric nanogenerator core 2 moves along the central axis, forming a continuous charge transfer during the swing. The power generation tank design inside the box body 1 can be 3D printed in different models according to needs.

[0094] In this embodiment, the power generation test of the two modules was carried out respectively by simulating 0.5Hz wave conditions on a six-degree-of-freedom vibration table. Figure 9 The maximum output open circuit voltage of the liquid-solid friction nano-power generation core 2 in the center is 173.79V, and the short circuit current is 433.3nA; Figure 10 As shown, the output open-circuit voltage of the solid-solid friction nano-power generation of the 3D printed box 1 and the friction disc 3 is 288.43V, and the short-circuit current is 2991.23nA. It can be seen that the composite generator provided in this embodiment can effectively improve the power generation efficiency, is suitable for low-power application scenarios such as buoys and offshore monitoring equipment, is suitable for powering ocean micro-devices, and is in line with the development direction of green energy.

[0095] The same or similar reference numerals correspond to the same or similar components;

[0096] The terms used in the drawings to describe positional relationships are for illustrative purposes only and are not to be construed as limiting the present application.

[0097] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A nested composite triboelectric nanogenerator, characterized in that: include: A box body (1), a liquid-solid friction nano-power generation tube core (2), and a plurality of friction discs (3); The box body (1) comprises an upper box body (11) and a lower box body (12) of symmetrical structure, wherein a plurality of protrusions (13) are provided inside the upper box body (11) and the lower box body (12); protrusion sensing electrodes (14) are provided on two side surfaces of each protrusion (13), and the protrusion sensing electrodes (14) are covered with a first polymer material (15); The liquid-solid friction nano-power generation tube core (2) is transversely arranged on the raised portion (13) of the lower box body (12) and can roll back and forth in the box body (1); Each friction disc (3) is nested outside the liquid-solid friction nano-power generation tube core (2) and is embedded in a groove formed by adjacent protrusions (13); two symmetrical and non-contact disc sensing electrodes (31) are respectively provided on two side surfaces of each friction disc (3), and the disc sensing electrodes (31) are covered with a second polymer material (32); The first polymer material (15) and the second polymer material (32) have opposite polarities; Under the action of wave energy, when the box body (1) reciprocates horizontally, the liquid-solid friction nano-generator core (2) performs liquid-solid friction power generation; when the box body (1) reciprocates longitudinally, the liquid-solid friction nano-generator core (2) rolls back and forth in the box body (1), and at the same time drives the friction disc (3) to roll back and forth in the groove, and causes the second polymer material (32) and the first polymer material (15) to generate solid-solid friction power; when the box body (1) reciprocates vertically, the liquid-solid friction nano-generator core (2) and the friction disc (3) move up and down, and causes the second polymer material (32) and the first polymer material (15) to generate solid-solid friction power.

2. The nested composite triboelectric nanogenerator according to claim 1, characterized in that: The liquid-solid friction nano-power generation tube core (2) comprises: an outer tube (21), a first inner tube (22), a second inner tube (23), a friction liquid (24), an outer induction electrode (25), a first inner induction electrode (26), and a second inner induction electrode (27); The outer tube (21), the first inner tube (22) and the second inner tube (23) are sequentially spaced and nested from the outside to the inside; The friction liquid (24) is arranged in the gap between the outer tube (21) and the first inner tube (22), and inside the second inner tube (23); The external sensing electrode (25) is arranged on the outer wall of the outer tube (21), the first internal sensing electrode (26) is arranged on the inner wall of the first inner tube (22), and the second internal sensing electrode (27) is arranged on the outer wall of the second inner tube (23); When the box body (1) moves back and forth laterally, the friction liquid (24) rubs against the inner wall of the outer tube (21), the outer wall of the first inner tube (22), and the inner wall of the second inner tube (23), generating charge transfer, and inducing charges on the external induction electrode (25), the first internal induction electrode (26), and the second internal induction electrode (27), respectively. The induced charges are led out through external wires to generate alternating current, thereby realizing liquid-solid friction power generation.

3. The nested composite triboelectric nanogenerator according to claim 2, characterized in that: The outer tube (21), the first inner tube (22) and the second inner tube (23) are all made of insulating materials, and the insulating material includes any one of PTFE, PE, PP, PET, PDMS and PVC.

4. The nested composite triboelectric nanogenerator according to claim 2, characterized in that: The raised portion sensing electrode (14), the disk sensing electrode (31), the external sensing electrode (25), the first internal sensing electrode (26), and the second internal sensing electrode (27) are all made of conductive materials, and the conductive material includes any one of copper foil, aluminum foil, and a conductive coating.

5. The nested composite triboelectric nanogenerator according to claim 2, characterized in that: The friction liquid (24) is specifically deionized water, magnetic fluid or aqueous solution.

6. The nested composite triboelectric nanogenerator according to claim 2, characterized in that: The volume of the friction liquid (24) in the gap is less than or equal to half of the volume of the gap between the outer tube (21) and the first inner tube (22); The volume of the friction liquid (24) inside the second inner tube (23) is less than or equal to half of the internal volume of the second inner tube (23).

7. The nested composite triboelectric nanogenerator according to claim 1, characterized in that: The first polymer material (15) is specifically nylon; the second polymer material (32) is specifically any one of PTFE, FEP and PI.

8. The nested composite triboelectric nanogenerator according to claim 1, characterized in that: The material of the friction disc (3) is specifically any one of acrylic, polyvinyl chloride and polyphenylene ether.

9. The nested composite triboelectric nanogenerator according to claim 1, characterized in that: The upper box body (11), the lower box body (12) and the raised portion (13) are manufactured based on 3D printing technology.

10. The nested composite triboelectric nanogenerator according to claim 1, characterized in that: The longitudinal length of the box body (1) is the same as the circumference of the friction disc (3), and the vertical height is greater than the diameter of the friction disc (3).

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