Wave energy collecting device

Abstract

The utility model discloses a wave energy collecting device, and relates to the technical field of wave energy utilization, a first friction area is fixed in a shell, a second friction area is movably arranged in the shell, the second friction area faces the first friction area, the first friction area is located on the motion trail of the second friction area, and the first friction area and the second friction area can generate electricity through friction. The first friction area and / or the second friction area are / is connected with an energy storage part; the closed circuit is connected with the energy storage part, and magnetic flux penetrating through the closed circuit can change under the action of waves; the second friction area can move in multiple directions under the action of waves, so that the wave energy collecting device can almost achieve 360-degree all-directional wave energy collection, and the wave energy capturing capacity of the wave energy collecting device is improved. A friction-electromagnetic composite power generation mechanism is achieved through the first collection mechanism and the second collection mechanism, and the electric energy collection power of the wave energy collection device is improved.

Description

Technical Field

[0001] This utility model relates to the field of wave energy utilization technology, and in particular to a wave energy harvesting device. Background Technology

[0002] In the existing technology, wave energy harvesters can only harvest wave energy in a specific direction. This makes it difficult for existing wave energy harvesters to achieve a high degree of wave energy harvesting when facing complex and ever-changing marine environments. Furthermore, the output power of existing wave energy harvesters is relatively low.

[0003] Therefore, how to improve the wave energy harvesting capability of wave energy harvesting devices and increase the output power of wave energy harvesting devices has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a wave energy harvesting device that can capture wave energy from almost 360° all directions, effectively improving the wave energy harvesting device's ability to capture wave energy. At the same time, by harvesting and utilizing wave energy through the first and second harvesting mechanisms, a combined generator mechanism of triboelectric power generation and electromagnetic power generation is realized, thereby increasing the output power of the wave energy harvesting device.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a wave energy collection device, which includes a housing and a first collection mechanism and a second collection mechanism inside the housing.

[0007] The first collection mechanism includes a first friction zone and a second friction zone. The first friction zone is fixed inside the housing, and the second friction zone is movably disposed inside the housing. The second friction zone is positioned facing the first friction zone. The second friction zone can move in multiple directions under the action of waves. The first friction zone is located on the movement trajectory of the second friction zone. The first friction zone and the second friction zone can generate electricity through friction. The first friction zone and / or the second friction zone is connected to an energy storage device.

[0008] The second acquisition mechanism includes a closed circuit and a magnetic component. The closed circuit is connected to the energy storage component, and the magnetic flux passing through the closed circuit can change under the action of waves.

[0009] Preferably, the first friction zone includes a polytetrafluoroethylene layer, and the second friction zone includes a fleece layer; and / or, the first friction zone is connected to an electrode, which is connected to the energy storage device; and / or, a drag-reducing layer for reducing frictional resistance is provided between the first friction zone and the second friction zone.

[0010] Preferably, the magnetic component and the closed circuit are arranged sequentially from the inside out, and the closed circuit can generate relative displacement with respect to the magnetic component under the action of waves; or, the closed circuit and the magnetic component are arranged sequentially from the inside out, and the closed circuit can move to cut the magnetic flux generated by the magnetic component under the action of waves.

[0011] Preferably, the wave energy harvesting device includes a rocking component, a first end of which is connected to the second friction zone, a second end of which is universally connected to the inner wall of the housing, and the magnetic component or the closed circuit is disposed on the rocking component.

[0012] Preferably, the closed circuit includes a plurality of coils arranged circumferentially along the housing, and the magnetic component includes a plurality of permanent magnets arranged circumferentially along the rocking component.

[0013] Preferably, the wave energy harvesting device includes an elastic element sleeved on the rocking member, the elastic element applying a first force to the second friction area, the first force causing the second friction area to move relative to the first friction area.

[0014] Preferably, the wave energy harvesting device includes a mass block disposed on the rocking member, and the magnetic element or the closed circuit is arranged along the circumference of the mass block or the circumference of the rocking member.

[0015] Preferably, the lower part of the shell is arc-shaped; and / or, the upper part of the shell is provided with a hydrophobic layer, and the lower part of the shell is provided with a hydrophilic layer.

[0016] Preferably, the wave energy harvesting device further includes a first adjustment component for adjusting the distance between the first friction zone and the second friction zone; and a second adjustment component for adjusting the distance between the closed circuit and the magnetic component.

[0017] The present invention achieves the following technical advantages over the prior art:

[0018] In this invention, the first collection mechanism includes a first friction zone and a second friction zone. The first friction zone is fixed inside the housing, and the second friction zone is movably disposed inside the housing. The first friction zone is located on the movement trajectory of the second friction zone. Both the first and second friction zones are capable of generating static electricity through friction. An energy storage device is connected to the first and / or second friction zones. Based on this structure, when the housing moves under the action of waves, the housing transmits the force of the waves to the second friction zone. The second friction zone moves under the action of the waves and rubs against the first friction zone. The charge generated by the friction is collected through the energy storage device, i.e., in this invention... The first collection mechanism can convert wave energy into friction between the first and second friction zones, and then collect the charge generated by the friction between the first and second friction zones. Furthermore, the second friction zone can move in multiple directions under the action of the waves. Thus, when waves from multiple directions act on the wave energy collection device of this invention, the invention can collect wave energy through the frictional charging between the first and second friction zones. This enables the invention to almost achieve 360° all-round wave energy collection in low-frequency environments, improving the wave energy collection capability of the wave energy collection device in this invention.

[0019] Meanwhile, this invention includes a second acquisition mechanism inside the housing. The second acquisition mechanism includes a closed circuit and a magnetic component. The closed circuit is connected to the energy storage component. The magnetic flux passing through the closed circuit changes under the action of waves, thereby generating induced charges in the closed circuit and collecting them by the energy storage component. In other words, the second acquisition mechanism converts wave energy into changes in the magnetic flux of the closed circuit, and then converts the wave energy into electrical energy. Furthermore, this invention can capture wave energy in a wider frequency range through the second acquisition mechanism, realizing the full-frequency utilization of wave energy and improving the power of the wave energy acquisition device in collecting wave energy and outputting electrical energy. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the wave energy harvesting device.

[0022] Figure 2 This is a schematic diagram of the longitudinal section of the wave energy harvesting device;

[0023] Figure 3 This is a top view of the electrodes;

[0024] Among them, 1. Upper part of the shell; 2. Electrode; 3. First friction area; 4. Second friction area; 5. Magnetic component; 6. Coil; 7. Elastic component; 8. Swing component; 9. Ball joint base; 10. Lower part of the shell; 11. Second bolt; 12. First electrode; 13. Second electrode. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1-3 As shown, the first collection mechanism of this utility model includes a first friction zone 3 and a second friction zone 4. The first friction zone 3 is fixed inside the housing, and the second friction zone 4 is movably disposed inside the housing. The first friction zone 3 is located on the movement trajectory of the second friction zone 4. The first friction zone 3 and the second friction zone 4 can generate electricity through friction. The first friction zone 3 and / or the second friction zone 4 are connected to an energy storage device. Based on the above structure, when the housing moves under the action of waves, the housing transmits the force of the waves to the second friction zone 4. The second friction zone 4 moves under the action of waves and rubs against the first friction zone 3. The charge generated by the friction is collected through the energy storage device. That is, the first collection mechanism of this utility model can convert wave energy into energy between the first friction zone 3 and the second friction zone 4. Friction is used to collect the charge generated by the friction between the first friction zone 3 and the second friction zone 4. Furthermore, the second friction zone 4 can move in multiple directions under the influence of waves. Thus, when waves from multiple directions act on the wave energy harvesting device of this invention, the device can collect wave energy through the frictional electrification between the first friction zone 3 and the second friction zone 4. This enables the invention to collect wave energy almost 360° omnidirectionally in low-frequency environments, improving the wave energy harvesting capability of the device. The first harvesting mechanism can convert wave energy into the mechanical energy of the movement of the second friction zone 4, and convert the mechanical energy of the movement of the second friction zone 4 into electrical energy generated by the frictional electrification between the first friction zone 3 and the second friction zone 4.

[0028] Meanwhile, this invention includes a second acquisition mechanism inside the housing. The second acquisition mechanism includes a closed circuit and a magnetic component 5. The closed circuit is connected to the energy storage component. The magnetic flux passing through the closed circuit changes under the action of waves, thereby generating induced charges in the closed circuit and collecting them by the energy storage component. In other words, the second acquisition mechanism converts wave energy into changes in the magnetic flux of the closed circuit, and then converts wave energy into electrical energy. Furthermore, this invention can capture wave energy in a wider frequency range through the second acquisition mechanism, realizing the full-frequency utilization of wave energy and improving the power of the wave energy acquisition device in collecting wave energy and outputting electrical energy.

[0029] The second friction zone 4 is movably disposed within the shell, meaning that when waves act on the shell, the second friction zone 4 can move within the shell, allowing the first friction zone 3 and the second friction zone 4 to generate static electricity through friction. The first friction zone 3 being located on the trajectory of the second friction zone 4 means that when waves act on the shell, the second friction zone 4 will move relative to the first friction zone 3 under the influence of the waves and come into contact with it, thereby generating static electricity. The first friction zone 3 and the second friction zone 4 include the following concentrated states: ① the first friction zone 3 and the second friction zone 4 are in contact before the shell is subjected to waves, and ② the first friction zone 3 and the second friction zone 4 are not in contact before the shell is subjected to waves, but come into contact after the shell is subjected to waves.

[0030] When the friction between the first friction zone 3 and the second friction zone 4 is solid-to-solid friction, the first friction zone 3 and the second friction zone 4 can be made of the same material or different materials, as long as the first friction zone 3 and the second friction zone 4 can achieve the effect of triboelectric charging under the action of waves. Furthermore, the first friction zone 3 and the second friction zone 4 can be made of various different materials. Specifically, the first friction zone 3 and the second friction zone 4 can be made of materials such as polytetrafluoroethylene (PTFE) or felt. When the first friction zone 3 or the second friction zone 4 is made of felt, it not only has excellent triboelectric charging performance, but also helps to reduce the frictional resistance between the first friction zone 3 and the second friction zone 4, extending the service life of the wave energy harvesting device in this invention. Power density has a quadratic relationship with surface charge density. Using soft contact materials for the first friction zone 3 and the second friction zone 4 can effectively utilize the friction surface. Surface modification methods can also be used to increase the surface charge density, thereby increasing the output power (output electrical energy) of the wave energy harvesting device.

[0031] It should be noted that the first friction zone 3 and the second friction zone 4 are not limited to the description above. Other configurations that allow the first friction zone 3 and the second friction zone 4 to generate electrical charge under the action of wave energy are also applicable to the configuration of the first friction zone 3 and the second friction zone 4 in this invention. The first friction zone 3 and / or the second friction zone 4 are connected to an external component capable of storing electrical energy (such as a capacitor or battery) to store the electrical energy generated by the wave energy harvesting device in this invention.

[0032] Furthermore, this invention provides a resistance-reducing layer between the first friction zone 3 and the second friction zone 4 to reduce frictional resistance. Specifically, the resistance-reducing layer can refer to the first friction zone 3 and / or the second friction zone 4 having resistance-reducing capabilities. In this case, the resistance-reducing layer can specifically be a structure such as fluff disposed on the first friction zone 3 and / or the second friction zone 4; or the resistance-reducing layer can also be a structure located between the first friction zone 3 and the second friction zone 4. However, regardless of the above-mentioned arrangement of the resistance-reducing layer, it must meet the following conditions: on the one hand, the resistance-reducing layer must be able to reduce the frictional resistance between the first friction zone 3 and the second friction zone 4, and minimize the performance degradation and damage of the first friction zone 3 and the second friction zone 4 due to friction; on the other hand, the resistance-reducing layer must not eliminate the friction between the first friction zone 3 and the second friction zone 4, thereby ensuring that the triboelectric charging function between the first friction zone 3 and the second friction zone 4 can be successfully realized.

[0033] like Figures 1-3 As shown, the first friction zone 3 is connected to an electrode 2, which is connected to the energy storage device. The electrode 2 is used to transfer the charge generated by the friction between the first friction zone 3 and the second friction zone 4 to the energy storage device. The electrode 2 can be an interdigitated electrode, a copper electrode, or an iron electrode, or any other electrode that can conduct electricity. When the electrode 2 is an interdigitated electrode, the electrode 2 includes a first electrode 12 and a second electrode 12 spaced apart along the circumference of the shell. A plurality of first electrodes 12 are connected to each other, and a plurality of second electrodes 13 are connected to each other. Both the first electrode 12 and the second electrode 13 can be copper foil.

[0034] The magnetic flux passing through the closed circuit changes under the influence of waves, thereby storing the electrical energy generated by the closed circuit in an energy storage device. This process is based on Faraday's law of electromagnetic induction. The closed circuit and magnetic component 5 can be arranged in two ways: ① the magnetic component 5 and the closed circuit are arranged sequentially from the inside out, and the closed circuit can undergo relative displacement with respect to the magnetic component 5 under the influence of waves; or ② the closed circuit and the magnetic component 5 are arranged sequentially from the inside out, and the closed circuit can move by cutting the magnetic flux generated by the magnetic component 5 under the influence of waves. The magnetic component 5 can be a common non-permanent magnet or a permanent magnet, etc.; the closed circuit can be a coil 6 or other structure capable of forming a closed circuit.

[0035] like Figure 1 , Figure 2As shown, the wave energy harvesting device of this invention also includes a swinging component 8. The first end of the swinging component 8 is connected to the second friction zone 4, and the second end of the swinging component 8 is universally connected to the inner wall of the shell. A magnetic component 5 or a closed circuit is disposed on the swinging component 8. At this time, when a wave acts on the shell, the swinging component 8 moves under the action of the wave, and synchronously drives the second friction zone 4 to move, and also drives the magnetic component 5 or the closed circuit disposed on the swinging component 8 to move, thereby realizing triboelectric charging and electromagnetic charging.

[0036] The second end of the rocker component 8 can be directly and universally connected to the bottom of the housing, or the ball joint base 9 can be placed into the placement groove at the bottom of the housing first, and then the second end of the rocker component 8 and the ball joint base 9 can be universally connected (universal connection can be understood as the rocker component 8 being able to rotate relative to the housing in multiple directions). Furthermore, the ball joint base 9 and the placement groove can also be replaced with a universal joint or other structure that allows the second end of the rocker component 8 to rotate relative to the housing in multiple directions.

[0037] Furthermore, such as Figure 1 , Figure 2 As shown, the wave energy harvesting device also includes an elastic element 7 sleeved on the swinging member 8. The elastic element 7 can apply a first force to the second friction zone 4, causing the second friction zone 4 to move relative to the first friction zone 3. The use of the elastic element 7 and the ball joint base 9 not only makes the wave energy harvesting device easier to install and fix, but also increases the swing angle of the wave energy harvesting device, enabling more effective harvesting of wave energy. The elastic element 7, the swinging member 8, and the ball joint base 9 form an inverted pendulum structure. The setting of the elastic element 7 allows the inverted pendulum structure to swing flexibly under the impact of waves, driving the second friction zone 4 to move relative to the first friction zone 3, realizing triboelectric generation. It can also drive the magnetic element 5 or closed circuit located on the swinging member 8 to move relative to the closed circuit or magnetic element 5 fixed on the shell, realizing a change in the magnetic flux through the closed circuit, achieving electromagnetic electrostatic generation. In other words, after the inverted pendulum structure is triggered by waves, the inverted pendulum structure enables the first and second harvesting mechanisms to achieve almost 360-degree omnidirectional wave energy harvesting in the low-frequency wave environment, increasing the operating frequency of the first and second harvesting mechanisms (operating frequency refers to the frequency at which wave energy is converted into electrical energy). Furthermore, the elastic element 7 can convert instantaneous impact energy into elastic potential energy, which can be stored and released during the swing of the swinging element 8, extending the swing time of the swinging element 8. This allows the first and second acquisition mechanisms to convert wave energy into electrical energy for a longer period, improving the conversion efficiency of wave energy into electrical energy. At the same time, the inverted pendulum structure also enables the wave energy acquisition device in this invention to adapt to waves of different amplitudes, increasing the robustness of the wave energy acquisition device.

[0038] Furthermore, the wave energy harvesting device of this utility model integrates the advantages of the first harvesting mechanism and the second harvesting mechanism. By coupling the elastic element 7 and setting the first friction area 3 and / or the second friction area 4 as a soft contact mode brought about by the fluff, the efficiency of the wave energy harvesting device in capturing and converting low-frequency wave energy is significantly improved. Specifically, the first harvesting mechanism can effectively generate electricity through friction in the low-frequency motion of waves (converting wave energy into electrical energy through friction), and the second harvesting mechanism can capture wave energy in a wider frequency range through electromagnetic induction, realizing the full-frequency utilization of wave energy.

[0039] The wave energy harvesting device of this invention also includes a first adjusting component for adjusting the distance between the first friction zone 3 and the second friction zone 4; and a second adjusting component for adjusting the distance between the closed circuit and the magnetic component 5. Figure 1 , Figure 2 As shown, the first adjustment assembly includes a first bolt for fixing the first friction layer to the upper part 1 of the housing, and a second bolt 11 for connecting the ball joint base 9 and the placement groove of the lower part 10 of the housing. By adjusting the position of the second bolt 11 on the side of the placement groove, the length of the ball joint base 9 extending into the placement groove can be adjusted, thereby changing the distance between the first friction area 3 and the second friction area 4. Alternatively, the first bolt and the second bolt 11 can be replaced by a first adhesive layer and a second adhesive layer. By changing the thickness of the first adhesive layer and the second adhesive layer, the distance between the first friction area 3 and the second friction area 4 can be adjusted. By adjusting the distance between the first friction area 3 and the second friction area 4, the output electrical energy of the first acquisition mechanism can be adjusted. Similarly, the second adjustment assembly can also be a bolt or an adhesive layer for fixing the closed circuit or magnetic component 5 into the housing. It should be noted that the first adjustment assembly and the second adjustment assembly are not limited to the above structures. Other structures that can adjust the distance between the first friction area 3 and the second friction area 4, and adjust the distance between the closed circuit and the magnetic component 5, can also be used as the first adjustment assembly or the second adjustment assembly.

[0040] In this invention, the lower part of the shell is arc-shaped, which increases the contact area between the shell and the liquid surface, allowing the shell to withstand greater buoyancy and making it less prone to capsizing. Furthermore, / or, the upper part of the shell is provided with a hydrophobic layer, and the lower part with a hydrophilic layer. This prevents excessive liquid accumulation near the upper part of the wave energy harvesting device, causing the liquid to tend to accumulate near the lower part. This lowers the center of gravity of the wave energy harvesting device, improving its anti-capsulation capability and enabling it to maintain stable power output even in extreme sea conditions and weather conditions. In other words, the hydrophobic and hydrophilic layers allow the inverted pendulum structure to effectively absorb and transfer wave energy while maintaining stability, reducing energy loss.

[0041] like Figure 1 , Figure 2 As shown, a mass block is also provided on the rocking member 8. At this time, the magnetic element 5 or the closed circuit can be arranged along the circumference of the mass block or along the circumference of the rocking member 8. Under the action of violent water waves, the gravity of the mass block and the magnetic element 5 or the closed circuit provided on the rocking member 8 can induce the elastic element 7 to swing at high frequency. With the swing of the elastic element 7, the second friction zone 4 and the first friction zone 3 come into contact and separate, and then generate electricity through friction, effectively converting the water wave energy from almost any direction into electrical energy.

[0042] In this invention, the shell can be a closed shell. When the shell is a closed shell, ① the shell can prevent external water, salt, dirt and other external impurities from entering, reducing the direct impact of external environment such as wind, waves, temperature and humidity on the internal structure of the shell, minimizing the corrosion and damage to the internal components of the shell, and extending the service life of the wave energy collection device; ② the shell reduces the wave energy loss caused by interference from external factors such as water flow and wind, ensuring the effective collection and conversion of wave energy; ③ the shell increases the overall buoyancy of the wave energy collection device, maintaining the stability of the wave energy collection device on the water surface, and to a certain extent avoiding the problem of the wave energy collection device overturning due to wave impact and other factors.

[0043] The second data acquisition mechanism converts wave energy into electrical energy through electromagnetic induction. Based on Faraday's law of electromagnetic induction, when the oscillating component 8 swings, it drives the magnetic component 5 or closed circuit on the oscillating component 8 to move, causing the magnetic flux through the closed circuit to change under the influence of the waves. As the shell moves with the waves, the magnetic component 5 or closed circuit on the oscillating component 8 swings accordingly. When the magnetic component 5 moves away from the closed circuit, the magnetic flux through the closed circuit decreases; when the magnetic component 5 moves closer to the closed circuit, the magnetic flux through the closed circuit increases. This cycle repeats, changing the magnetic flux through the closed circuit, thereby generating an electric current.

[0044] Furthermore, the wave energy harvesting device of this invention also includes a power management module. The addition of this module ensures a stable current output under various marine environments, avoiding energy waste and improving the wave energy capture and conversion efficiency of the device. Through structural optimization and material selection, this invention achieves superior performance in durability, stability, and efficiency. The power management module reduces component losses and improves the stability of the circuitry within the wave energy harvesting device.

[0045] The design process of the power management module in this utility model is as follows: First, the characteristics of ocean waves are investigated. Based on the working mode and principle of triboelectric nanogenerators and electromagnetic generators, the device structure and friction materials are designed to fabricate a triboelectric-electromagnetic composite wave energy harvester and study its working principle. The potential distribution is simulated using COMSOL software, and the magnetic field distribution is simulated using MAXWELL software. An experimental testing system is built to conduct motor drive experiments, water tank simulated wave experiments, and environmental tests to experimentally test the output characteristics of the harvester, including voltage, current, and power. The influence of structural parameters, friction materials, and excitation conditions on its output performance is studied, and the harvester is optimized and improved. Finally, a power management circuit is designed to drive the sensor, demonstrating its application performance and conducting durability tests.

[0046] The power management module is a hardware design. It includes a rectifier circuit and a DC-DC regulator circuit. The power management module can convert and store the electrical energy generated by the first and second acquisition mechanisms (AC / DC conversion), and can supply power at a specific operating voltage. The DC-DC converter can specifically use the LT1302 chip.

[0047] The "and / or" mentioned in this article refers to the fact that, within the same sentence, the text preceding "and / or" and the text following "and / or" can either exist simultaneously or exist independently. For example, "A and / or B" includes three cases: either A or B exists alone, or A and B exist simultaneously. "And / or" has the same meaning as "and / or" and will not be elaborated upon here.

[0048] This utility model discloses multiple technical solutions, but does not provide any contrary technical teachings.

[0049] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A wave energy harvesting device, characterized in that, The wave energy harvesting device includes a housing, and a first harvesting mechanism and a second harvesting mechanism are provided inside the housing. The first collection mechanism includes a first friction zone and a second friction zone. The first friction zone is fixed inside the housing, and the second friction zone is movably disposed inside the housing. The second friction zone is positioned facing the first friction zone. The second friction zone can move in multiple directions under the action of waves. The first friction zone is located on the movement trajectory of the second friction zone. The first friction zone and the second friction zone can generate electricity through friction. The first friction zone and / or the second friction zone is connected to an energy storage device. The second acquisition mechanism includes a closed circuit and a magnetic component. The closed circuit is connected to the energy storage component, and the magnetic flux passing through the closed circuit can change under the action of waves.

2. The wave energy harvesting device according to claim 1, characterized in that, The first friction zone includes a polytetrafluoroethylene layer, and the second friction zone includes a fluff layer; and / or, the first friction zone is connected to an electrode, which is connected to the energy storage device; and / or, a drag-reducing layer is provided between the first friction zone and the second friction zone to reduce frictional resistance.

3. The wave energy harvesting device according to claim 1, characterized in that, The magnetic component and the closed circuit are arranged sequentially from the inside out. The closed circuit can generate a relative displacement with respect to the magnetic component under the action of waves; or, the closed circuit and the magnetic component are arranged sequentially from the inside out. The closed circuit can move to cut the magnetic flux generated by the magnetic component under the action of waves.

4. The wave energy harvesting device according to claim 1, characterized in that, The wave energy harvesting device includes a rocking component, the first end of which is connected to the second friction zone, and the second end of which is universally connected to the inner wall of the housing. The magnetic component or the closed circuit is disposed on the rocking component.

5. The wave energy harvesting device according to claim 4, characterized in that, The closed circuit includes a plurality of coils arranged circumferentially along the housing, and the magnetic component includes a plurality of permanent magnets arranged circumferentially along the rocking component.

6. The wave energy harvesting device according to claim 4 or 5, characterized in that, The wave energy harvesting device includes an elastic element sleeved on the rocking member. The elastic element applies a first force to the second friction zone, and the first force causes the second friction zone to move relative to the first friction zone.

7. The wave energy harvesting device according to claim 4, characterized in that, The wave energy harvesting device includes a mass block disposed on the rocking member, and the magnetic element or the closed circuit is arranged along the circumference of the mass block or the circumference of the rocking member.

8. The wave energy harvesting device according to claim 1, characterized in that, The lower part of the shell is arc-shaped; and / or, the upper part of the shell is provided with a hydrophobic layer, and the lower part of the shell is provided with a hydrophilic layer.

9. The wave energy harvesting device according to claim 1, characterized in that, The wave energy harvesting device further includes a first adjustment component for adjusting the distance between the first friction zone and the second friction zone; and a second adjustment component for adjusting the distance between the closed circuit and the magnetic component.

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