A dual hydrofoil piezoelectric tidal current power generation device

Abstract

The application provides a double hydrofoil piezoelectric tidal current energy generating device, which combines oscillating hydrofoils and piezoelectric effect, does not need to design an intermediate conversion mechanism, and directly generates electricity by using the tidal current energy captured by the hydrofoils.

Description

Technical Field

[0001] This invention belongs to the technical field of tidal current power generation cones, and particularly relates to a dual hydrofoil piezoelectric tidal current power generation device. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Energy is the cornerstone of social development. Currently, energy consumption mainly comes from traditional fossil fuels, primarily oil, coal, and natural gas. The large-scale use of fossil fuels has triggered a series of environmental problems. Therefore, the development of clean and sustainable energy is receiving increasing attention from countries around the world.

[0004] Among various clean energy sources, ocean energy possesses unique advantages and enormous development potential. According to surveys and estimates, my country's ocean energy resources are approximately 4.31 × 10⁻⁶. 8 With a capacity of kW, tidal energy has a very promising development prospect. Compared with other forms of ocean energy, tidal energy has better stability and is easier to capture. Furthermore, it has a higher energy density than solar and wind energy.

[0005] Traditional tidal power generation devices are mainly blade-rotating types, mostly used in deeper waters, and suffer from engineering problems such as large equipment size, high cost, and difficulty in power transmission. Oscillating hydrofoils, on the other hand, can be used in shallow coastal waters, have a relatively simple overall structure, and are easier to install and maintain. Furthermore, because the hydrofoils move at lower speeds, they have less impact on underwater organisms.

[0006] The general working principle of an oscillating hydrofoil generator is as follows: under the action of the incoming flow, the hydrofoil generates oscillating motion, and then the oscillating motion of the hydrofoil is converted into the rotational motion required by the generator by a mechanical mechanism or other device.

[0007] Chinese Patent 201811421489.4 proposes a dual hydrofoil heave-pitch coupled motion oscillation tidal current power generation device, which can realize the continuous oscillation motion of the hydrofoil under the incoming flow.

[0008] Current oscillating hydrofoil power generation devices often require additional mechanical mechanisms or other devices to convert the oscillating motion of the hydrofoil into the energy required by a conventional generator after the hydrofoil captures tidal energy. This increases the complexity of the power generation device. Summary of the Invention

[0009] To overcome the shortcomings of the prior art, the present invention provides a dual hydrofoil piezoelectric tidal energy power generation device, which combines oscillating hydrofoils and piezoelectric effect, eliminating the need for an intermediate conversion mechanism, and directly generating electricity from the tidal energy captured by the hydrofoils. The power generation device is further simplified and has a higher energy utilization rate.

[0010] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solution: a dual hydrofoil piezoelectric tidal energy generation device, comprising: a first linear hydraulic cylinder and a first guide rail arranged in parallel, and a first hydrofoil connected between the first linear hydraulic cylinder and the first guide rail by a first swing hydraulic cylinder; A second linear hydraulic cylinder and a second guide rail are arranged in parallel, and a second hydrofoil is connected between the second linear hydraulic cylinder and the second guide rail by a second swing hydraulic cylinder. Piezoelectric ceramic blocks are provided on both the first and second hydrofoils; A plurality of piezoelectric vibrators are provided on a first guide rail or a second guide rail. Each piezoelectric vibrator is provided with a piezoelectric polymer and a plurality of paddles that can interact with the piezoelectric vibrators under the drive of the up-and-down movement of the first linear hydraulic cylinder or the second linear hydraulic cylinder.

[0011] Furthermore, the initial pitch angles of the first hydrofoil and the second hydrofoil differ by 60-80°.

[0012] Furthermore, the first swing hydraulic cylinder is fixed on the output shaft of the first linear hydraulic cylinder, the pitch axis of the first swing hydraulic cylinder passes through the first hydrofoil and is connected to the first slider, and the first slider is set on the first guide rail and can move up and down along the first guide rail. Alternatively, the second swing hydraulic cylinder is fixed on the output shaft of the second linear hydraulic cylinder, and the pitch axis of the second swing hydraulic cylinder passes through the second hydrofoil and is connected to the second slider. The second slider is set on the second guide rail and can move up and down along the second guide rail.

[0013] Furthermore, the surface of the first slider is provided with a hole that can accommodate the first bearing, the outer ring of the first bearing is connected to the hole wall of the first slider, and the inner ring of the first bearing is connected to the pitch axis of the first swing hydraulic cylinder. Alternatively, the surface of the second slider is provided with a hole that can accommodate the second bearing, the outer ring of the second bearing is connected to the hole wall of the second slider, and the inner ring of the second bearing is connected to the pitch axis of the second swing hydraulic cylinder.

[0014] Furthermore, the first linear hydraulic cylinder is hydraulically connected to the second swing hydraulic cylinder, and the up-and-down movement of the first linear hydraulic cylinder drives the pitching movement of the second swing hydraulic cylinder. The second linear hydraulic cylinder is hydraulically connected to the first swing hydraulic cylinder, and the up-and-down movement of the second linear hydraulic cylinder drives the pitching movement of the first swing hydraulic cylinder.

[0015] Furthermore, the polarization direction of the piezoelectric ceramic block is perpendicular to the surface of the first or second hydrofoil.

[0016] Furthermore, multiple first paddles are equally spaced on the first slider along the direction of movement of the first slider, and the first paddles are arranged alternately with the first piezoelectric vibrators arranged on the first guide rail. Alternatively, multiple second paddles are equally spaced along the movement direction of the second slider on the second slider, and the second paddles are arranged alternately with the second piezoelectric vibrators arranged on the second guide rail.

[0017] Furthermore, a first permanent magnet is provided on the lever, and a second permanent magnet is provided on the piezoelectric vibrator, wherein the magnetic surfaces of the first permanent magnet and the second permanent magnet are opposite to each other and repel each other.

[0018] Furthermore, piezoelectric polymers are disposed on the upper and lower surfaces of the end of the piezoelectric oscillator away from where the second permanent magnet is disposed.

[0019] Furthermore, it also includes an energy storage unit, which is electrically connected to the piezoelectric polymer and the piezoelectric ceramic block, and is used to store the generated charge.

[0020] The above one or more technical solutions have the following beneficial effects: In this invention, under the influence of tidal energy, the first and second hydrofoils oscillate, which can be decomposed into pitch motion around the pitch axis and heave motion perpendicular to the direction of the incoming flow. Due to the pitch motion, the angle of attack of the hydrofoils changes, and the force on the piezoelectric ceramic block on the hydrofoil surface changes accordingly, generating an electric charge according to the piezoelectric effect. Due to the heave motion, the hydrofoils drive the connected slider to move together, and the slider drives the fixedly connected lever to move. The permanent magnet on the lever applies a force to the permanent magnet on the piezoelectric vibrator, thereby deforming the piezoelectric polymer on the piezoelectric vibrator and generating an electric charge according to the piezoelectric effect. The energy storage device stores the charge generated on the hydrofoil surface and the piezoelectric vibrator. In the entire power generation process, after the hydrofoils capture tidal energy, the pitch and heave motion of the hydrofoils is directly utilized without any other motion conversion mechanism, making the overall structure very simple and easy to install and maintain.

[0021] This invention utilizes the pitch and heave motion of the hydrofoil to generate piezoelectric power, resulting in higher energy efficiency.

[0022] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0024] Figure 1 This is a schematic diagram of the overall structure of the tidal power generation device in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram showing the connection between the pitch axis of the hydrofoil, the oscillating hydraulic cylinder, and the slider in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the dual hydrofoil linkage hydraulic system in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram showing the change of pressure on the hydrofoil surface with angle of attack in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the hydrofoil structure in Embodiment 1 of the present invention; Figure 6 This is a diagram showing the relative positions of the paddle and the piezoelectric vibrator in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the structure of the paddle and piezoelectric vibrator in Embodiment 1 of the present invention; Figure 8 This is a flowchart illustrating the working principle of the tidal power generation device in Embodiment 1 of the present invention.

[0025] Explanation of reference numerals in the attached figures 1. First linear hydraulic cylinder; 2. First piston rod; 3. First swing hydraulic cylinder; 4. First hydrofoil; 5. First guide rail; 6. First slider; 7. First paddle shifter; 8. First piezoelectric vibrator; 9. Second linear hydraulic cylinder; 10. Second piston rod; 11. Second swing hydraulic cylinder; 12. Second hydrofoil; 13. Second guide rail; 14. Second slider; 15. Second paddle shifter; 16. Second piezoelectric vibrator; 17. Subsea platform; 18. Bearing; 19. Pitch axis; 20. Piezoelectric ceramic block; 21. First permanent magnet; 22. Second permanent magnet; 23. Piezoelectric polymer. Detailed Implementation It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0027] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0028] Example 1 like Figure 1 As shown, this embodiment discloses a dual hydrofoil piezoelectric tidal energy generation device, which consists of two hydrofoil piezoelectric modules. The two hydrofoil piezoelectric modules have the same overall structure. The first hydrofoil piezoelectric module includes: a first linear hydraulic cylinder 1 and a first guide rail 5 arranged in parallel, and a first hydrofoil 4 connected between the first linear hydraulic cylinder 1 and the first guide rail 5 through a first swing hydraulic cylinder 3. The second hydrofoil piezoelectric module includes: a second linear hydraulic cylinder 9 and a second guide rail 13 arranged in parallel, and a second hydrofoil 12 connected between the second linear hydraulic cylinder 9 and the second guide rail 13 by a second swing hydraulic cylinder 11. The first linear hydraulic cylinder 1 is hydraulically connected to the second swing hydraulic cylinder 11, and the first linear hydraulic cylinder 1 drives the second swing hydraulic cylinder 3 to pitch under the up and down movement of the first linear hydraulic cylinder 1. The second linear hydraulic cylinder 9 is hydraulically connected to the first swing hydraulic cylinder 3, and the up-and-down movement of the second linear hydraulic cylinder 9 drives the pitching movement of the first swing hydraulic cylinder 3. A plurality of piezoelectric vibrators are provided on the first guide rail 5 or the second guide rail 13. The piezoelectric vibrators are provided with piezoelectric polymer 23 and a plurality of paddles that can interact with the piezoelectric vibrators under the drive of the up and down movement of the first linear hydraulic cylinder 1 or the second linear hydraulic cylinder 9.

[0029] In this embodiment, the difference between the first hydrofoil voltage module and the second hydrofoil piezoelectric module is that the initial pitch angles of the first hydrofoil 4 and the second hydrofoil 12 are different, with an angle difference of 60-80°.

[0030] In this implementation, such as Figure 5 As shown, both the upper and lower surfaces of the first hydrofoil 4 and the second hydrofoil 12 have regularly arranged grooves. Piezoelectric ceramic blocks 20 are embedded inside these grooves, and the polarization direction of the piezoelectric ceramic blocks 20 is perpendicular to the surface of the first hydrofoil 4 or the second hydrofoil 12. While ensuring the structural strength of the hydrofoil body, the number of grooves should be as large as possible to embed more piezoelectric ceramic blocks 20, thereby providing power generation.

[0031] In this embodiment, the first linear hydraulic cylinder 1, the second linear hydraulic cylinder 9, the first guide rail 5, and the second guide rail 13 are all fixed on the seabed platform 17, thereby providing support for the entire power generation device.

[0032] It is understandable that the first linear hydraulic cylinder 1, the second linear hydraulic cylinder 9, the first guide rail 5, and the second guide rail 13 are arranged parallel to each other.

[0033] In this embodiment, the first swing hydraulic cylinder 3 is fixed on the output shaft of the first linear hydraulic cylinder 1. The pitch axis 19 of the first swing hydraulic cylinder 3 passes through the first hydrofoil 4 and is connected to the first slider 6. The first slider 6 is set on the first guide rail 5 and can move up and down along the first guide rail 5.

[0034] like Figure 2 As shown, the first piston rod 2 on the first linear hydraulic cylinder 1 is fixedly connected to the first swing hydraulic cylinder 3, the end of the first pitch shaft on the first swing hydraulic cylinder 3 is fixedly connected to the inner ring of the bearing 18, a hole for accommodating the bearing 18 is opened on one side of the first slider 6, the bearing 18 is embedded in the hole opened in the first slider 6, and the outer ring of the bearing 18 is fixedly connected to the hole in the first slider 6.

[0035] The first slider 6 can reciprocate up and down along the first guide rail 5, and the movement direction of the first piston rod 2 is parallel to the movement direction of the first slider 6, so as to form a double support structure for the first hydrofoil 4.

[0036] It is understandable that the first hydrofoil 4 is fixedly connected to the first pitch axis so as to achieve synchronous swinging motion between the first pitch axis and the first hydrofoil.

[0037] In this embodiment, the second swing hydraulic cylinder 11 is fixed on the output shaft of the second linear hydraulic cylinder 9. The pitch axis of the second swing hydraulic cylinder 11 passes through the second hydrofoil 12 and is connected to the second slider 14. The second slider 14 is disposed on the second guide rail 13 and can move up and down along the second guide rail 13.

[0038] Specifically, the second piston rod 10 on the second linear hydraulic cylinder 11 is fixedly connected to the second swing hydraulic cylinder 11, the end of the second pitch shaft on the second swing hydraulic cylinder 11 is fixedly connected to the inner ring of the bearing 18, a hole for accommodating the bearing 18 is opened on one side of the second slider 14, the bearing 18 is embedded in the hole opened in the second slider 14, and the outer ring of the bearing 18 is fixedly connected to the hole in the second slider 14.

[0039] The second slider 14 can reciprocate up and down along the second guide rail 13, and the movement direction of the second piston rod 10 is parallel to the movement direction of the second slider 14, so as to form a double support structure for the second hydrofoil 12.

[0040] It is understandable that the second hydrofoil 12 is fixedly connected to the second pitch axis so as to achieve synchronous swinging motion of the second pitch axis and the second hydrofoil 12.

[0041] In this embodiment, as Figure 7As shown, the first slider 6 has a central hole through which the first guide rail 5 can pass. The first slider 6 can reciprocate up and down along the first guide rail 5. One side of the first slider 6 has a first extension strip, the direction of which is the direction of movement of the first slider 6. First paddles 7 are evenly spaced on the first extension strip. One piezoelectric vibrator 8 is provided on one side of the first guide rail 5, which is located on the same plane as the first extension strip. The first piezoelectric vibrators 8 are evenly spaced along the direction of movement of the first slider 6. The first paddles 7 and the first vibrators 8 are spaced at the same distance.

[0042] like Figures 6-7 As shown, the first lever 7 and the first piezoelectric vibrator 8 are arranged in a one-to-one correspondence and staggered arrangement. The vertical movement distance of the first linear hydraulic cylinder 1 cannot be greater than the arrangement gap of the first piezoelectric vibrator 8.

[0043] Similarly, the second slider 14 has a central hole through which the second guide rail 13 can pass. The second slider 14 can reciprocate up and down along the second guide rail 13. One side of the second slider 14 has a second extension block. The direction of the second extension block is the direction of movement of the second slider 14. Second paddles 15 are equally spaced on the second extension block. A second piezoelectric vibrator 16 is provided on one side of the second guide rail 13, which is located on the same plane as the second extension block. The second piezoelectric vibrators 16 are equally spaced along the direction of movement of the second slider 14. The second paddles 15 and the second piezoelectric vibrators 16 are spaced at the same distance.

[0044] The second lever 15 and the second piezoelectric vibrator 16 are arranged in a one-to-one correspondence and staggered. The vertical movement distance of the second linear hydraulic cylinder 9 cannot be greater than the arrangement gap of the second piezoelectric vibrator 16.

[0045] like Figure 7 As shown, a first permanent magnet 21 is fixed at the free end of the first paddle 7. The piezoelectric vibrator 8 adopts a cantilever beam support structure. A second permanent magnet 22 is fixed at the free end of the first piezoelectric vibrator 8. The magnetic poles of the first permanent magnet 21 and the second permanent magnet 22 are the same, ensuring that the magnetic force between the first permanent magnet 21 and the second permanent magnet 22 is a repulsive force. On the side near the fixed end of the first piezoelectric vibrator 8, piezoelectric polymer 23 is attached to both its upper and lower surfaces.

[0046] Similarly, a first permanent magnet 21 is fixed to the free end of the second paddle 15, and the second piezoelectric vibrator 16 adopts a cantilever beam support structure. A second permanent magnet 22 is fixed to the free end of the second piezoelectric vibrator 16. The magnetic poles of the first permanent magnet 21 and the second permanent magnet 22 are the same, ensuring that the magnetic force between the first permanent magnet 21 and the second permanent magnet 22 is a repulsive force. On the side near the fixed end of the second piezoelectric vibrator 16, piezoelectric polymer 23 is attached to both its upper and lower surfaces.

[0047] When a single hydrofoil generates electricity, it is located at a dead point (the extreme position of pitch or heave motion) under the action of the incoming flow. To generate piezoelectric electricity using hydrofoils, the problem of dead point motion must be solved to ensure that the hydrofoil's oscillating motion continues. Therefore, this invention adopts a dual hydrofoil linkage hydraulic system.

[0048] In this embodiment, a dual hydrofoil linkage hydraulic system is adopted. The oil outlet of the first linear hydraulic cylinder 1 is connected to the oil inlet of the second swing hydraulic cylinder 11, and the oil inlet of the first linear hydraulic cylinder 1 is connected to the oil outlet of the second swing hydraulic cylinder 11. The oil inlet of the second linear hydraulic cylinder 9 is connected to the oil outlet of the first swing hydraulic cylinder 3, and the oil outlet of the second linear hydraulic cylinder 9 is connected to the oil inlet of the first swing hydraulic cylinder 3.

[0049] like Figure 3 As shown in (a), the first hydrofoil 4 is at the extreme point of pitch motion, while the second hydrofoil 12 is at the extreme point of heave motion. Under the influence of the incoming flow, the first hydrofoil 4 moves downward, simultaneously driving the first piston rod 2 downward. Through the hydraulic circuit, the second swing hydraulic cylinder 11 drives the second hydrofoil 12 to move counterclockwise, that is, the pitch angle of the second hydrofoil 12 begins to change. When the pitch angle reaches a certain value, the second hydrofoil 12 begins to move downward, at which point the dead point of the heave motion of the second hydrofoil 12 is overcome. At the same time, it drives the second piston rod 10 downward, and through the hydraulic circuit, the first swing hydraulic cylinder 3 drives the first hydrofoil 4 to rotate clockwise, at which point the dead point of the pitch motion of the first hydrofoil 4 is overcome.

[0050] The power generation locations of the tidal power generation device provided in this embodiment are divided into two categories: the first category is the piezoelectric ceramic block located on the surface of the hydrofoil, and the second category is the piezoelectric polymer located on the piezoelectric vibrator.

[0051] The power generation principle of the tidal current power generation device provided in this embodiment is as follows: When fluid flows through a hydrofoil with a non-zero angle of attack, the rate of change of fluid velocity differs on the upper and lower surfaces of the hydrofoil, creating high-pressure and low-pressure zones. For example... Figure 4 As shown in (a), when the pitch angle of the hydrofoil is negative, its upper surface is a low-pressure area and its lower surface is a high-pressure area. Figure 4 As shown in (b), when the pitch angle of the hydrofoil is positive, its upper surface is a high-pressure area and its lower surface is a low-pressure area. Because of the pitch motion of the hydrofoil, its pitch angle is constantly changing, and the force of seawater acting on the surface of the hydrofoil also changes accordingly. That is, the piezoelectric ceramic block 20 on the surface of the hydrofoil is subjected to a constantly changing force in its polarization direction, and according to the piezoelectric effect, it generates an electric charge.

[0052] While the first hydrofoil 4 is heaving, it drives the first slider 6 to reciprocate linearly along the first guide rail 5. Simultaneously, the first slider 6 drives the first lever 7 to move up and down, causing the distance between the relatively positioned first permanent magnet 21 and second permanent magnet 22 to change accordingly. Consequently, the magnetic repulsive force acting on the free end of the first piezoelectric vibrator 8 also changes. Under the action of the magnetic repulsive force, the first piezoelectric vibrator 8 bends downwards, with its upper surface experiencing tensile stress and its lower surface experiencing compressive stress, which changes with the movement of the first lever 7. That is, the piezoelectric polymer 23 located on the upper surface of the first piezoelectric vibrator 8 experiences changing tensile stress, and the piezoelectric polymer 23 located on the lower surface of the first piezoelectric vibrator 8 experiences changing compressive stress. Therefore, according to the piezoelectric effect, the piezoelectric polymer 23 generates an electric charge.

[0053] like Figure 8 As shown, the charge generated by the piezoelectric ceramic block 20 and the piezoelectric polymer 23 is stored in the energy storage device through the circuit, and then the energy storage device supplies power to the external load.

[0054] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A dual-hydrofoil piezoelectric tidal current power generation device, characterized in that, include: A first linear hydraulic cylinder and a first guide rail are arranged in parallel, and a first hydrofoil is connected between the first linear hydraulic cylinder and the first guide rail by a first swing hydraulic cylinder. A second linear hydraulic cylinder and a second guide rail are arranged in parallel, and a second hydrofoil is connected between the second linear hydraulic cylinder and the second guide rail by a second swing hydraulic cylinder. The first linear hydraulic cylinder is hydraulically connected to the second swing hydraulic cylinder, and the up-and-down movement of the first linear hydraulic cylinder drives the pitching movement of the second swing hydraulic cylinder. The second linear hydraulic cylinder is hydraulically connected to the first swing hydraulic cylinder, and the up-and-down movement of the second linear hydraulic cylinder drives the pitching movement of the first swing hydraulic cylinder. The first swing hydraulic cylinder is fixed on the output shaft of the first linear hydraulic cylinder. The pitch axis of the first swing hydraulic cylinder passes through the first hydrofoil and is connected to the first slider. The first slider is set on the first guide rail and can move up and down along the first guide rail. The second swing hydraulic cylinder is fixed on the output shaft of the second linear hydraulic cylinder. The pitch axis of the second swing hydraulic cylinder passes through the second hydrofoil and is connected to the second slider. The second slider is set on the second guide rail and can move up and down along the second guide rail. Piezoelectric ceramic blocks are provided on both the first and second hydrofoils; The first and second hydrofoils have regularly arranged grooves on their upper and lower surfaces, and piezoelectric ceramic blocks are embedded inside the grooves. The polarization direction of the piezoelectric ceramic blocks is perpendicular to the surface of the first or second hydrofoil. Several piezoelectric vibrators are arranged on the first and second guide rails. The piezoelectric vibrators are equipped with piezoelectric polymers and several paddles that interact with the piezoelectric vibrators under the drive of the up and down movement of the first or second linear hydraulic cylinder. The plurality of paddles are equally spaced on the slider along the direction of slider movement, and the piezoelectric vibrators are equally spaced along the direction of slider movement, with the paddles and vibrators having the same spacing. The paddles correspond one-to-one with the piezoelectric vibrators set on the first and second guide rails, and are arranged in an alternating manner. The vertical movement distance of a linear hydraulic cylinder cannot exceed the spacing between piezoelectric vibrators.

2. The dual hydrofoil piezoelectric tidal current power generation device as described in claim 1, characterized in that, The initial pitch angles of the first hydrofoil and the second hydrofoil differ by 60-80°.

3. The dual hydrofoil piezoelectric tidal current power generation device as described in claim 1, characterized in that, The surface of the first slider is provided with a hole that can accommodate the first bearing. The outer ring of the first bearing is connected to the hole wall of the first slider, and the inner ring of the first bearing is connected to the pitch axis of the first swing hydraulic cylinder. The surface of the second slider is provided with a hole that can accommodate the second bearing. The outer ring of the second bearing is connected to the hole wall of the second slider, and the inner ring of the second bearing is connected to the pitch axis of the second swing hydraulic cylinder.

4. The dual hydrofoil piezoelectric tidal current power generation device as described in claim 1, characterized in that, A first permanent magnet is disposed on the lever, and a second permanent magnet is disposed on the piezoelectric vibrator. The magnetic surfaces of the first permanent magnet and the second permanent magnet are opposite to each other and repel each other.

5. The dual hydrofoil piezoelectric tidal current power generation device as described in claim 1, characterized in that, Piezoelectric polymers are disposed on the upper and lower surfaces of the end of the piezoelectric vibrator away from where the second permanent magnet is located.

6. The dual hydrofoil piezoelectric tidal current power generation device as described in claim 1, characterized in that, It also includes an energy storage unit, which is electrically connected to the piezoelectric polymer and the piezoelectric ceramic block, and is used to store the generated charge.

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