Wave energy power generation device

Abstract

The invention relates to a wave energy power generation device in the field of wave energy collection. The technical defects of an existing single power generation type wave energy collection device in the aspects of low-frequency adaptability, energy conversion efficiency and output stability are overcome, a combined type wave energy collection scheme with double innovation of'mechanism-principle 'is provided, and through the integrated design of an oscillation floater cantilever mechanism and a triboelectricity-electromagnetism combined power generation module. On one hand, the friction power generation efficiency is improved through reverse friction of the inner rotor and the outer rotor, and on the other hand, the electromagnetic induction effect is enhanced through reverse movement of the coil and the permanent magnet, so that the defect of insufficient output power of single friction power generation is overcome, and the defect of poor low-frequency efficiency of single electromagnetic power generation is overcome; and the overall energy conversion efficiency and output stability of the device are obviously improved. Huge impact force generated by wave fluctuation is directly captured to serve as power input, the average output power is greatly improved, and the ocean wave energy collecting capacity of the device is enhanced.

Description

Technical Field

[0001] This invention relates to wave energy generation devices, and more particularly to a wave energy generation device. Background Technology

[0002] With the increasing prominence of the global energy crisis and environmental problems, ocean wave energy, as a blue energy source with huge reserves and clean and renewable energy, has become a research hotspot in the field of new energy.

[0003] Existing wave energy generation devices have the following drawbacks: First, they rely solely on electromagnetic induction power generation as their core technology. Traditional electromagnetic power generation mechanisms generate electricity by having coils rotate with the rotor and fixed by external permanent magnets, allowing the coils to cut magnetic field lines. Since existing wave energy is difficult to collect continuously and stably, the efficiency of existing single-direction rotating electromagnetic power generation is relatively low. Second, their energy conversion efficiency is highly dependent on the motion frequency. Under the low-frequency oscillation conditions unique to ocean waves, the energy capture efficiency of the reciprocating pendulum drive structure is significantly reduced, and the reciprocating drive method is difficult to achieve stable output, further reducing power generation efficiency and making it difficult to adapt to the complex and ever-changing ocean wave environment. Summary of the Invention

[0004] (1) Technical problems to be solved To address the technical problems of existing wave energy power generation devices being highly dependent on motion frequency for energy conversion efficiency, and the significant decrease in energy capture efficiency of reciprocating pendulum drive structures under the unique low-frequency oscillation conditions of ocean waves, as well as the difficulty in achieving stable output due to the reciprocating drive method, further reducing power generation efficiency and making it difficult to adapt to the complex and ever-changing ocean wave environment, this invention provides a wave energy power generation device.

[0005] Technical solution This invention provides a wave energy generation device, comprising: Float; The support plate is fixedly connected to the upper end of the float; The front cover has a central shaft that is rotatably connected at its center. The bidirectional to unidirectional mechanism includes a fixed seat fixed to the front cover, one end of the central shaft extending into the fixed seat, and the ends of the central shaft being connected to the central shaft via a unidirectional bearing to a second bevel gear and a third bevel gear, and also includes a transmission shaft rotatably disposed on both sides of the fixed seat, the inner end of the transmission shaft on one side extending into the fixed seat and fixed to a first bevel gear meshing with the second bevel gear and the third bevel gear. The lower end of the cantilever is rotatably connected to the upper two ends of the support plate, and the upper end is fixedly connected to the corresponding drive shafts. The reversing mechanism includes a sun gear fixedly connected to the central shaft, and an external gear ring rotatably connected to the front end cover via a limit bearing. The sun gear drives the external gear ring to rotate in the opposite direction via an idler gear assembly. EMG power generation components include coils and permanent magnets respectively mounted on the sun gear and the outer gear ring; The TENG power generation module includes an inner rotor fixed to a central shaft, an outer rotor connected to an outer gear ring, friction materials for frictional contact are provided on the outer side of the inner rotor and the inner side of the outer rotor, and several copper electrodes are provided on the inner side of the outer rotor.

[0006] A further embodiment of the present invention includes a housing, which is fixedly connected to the front end cover, and a rear end cover is fixedly connected to the housing, with the rear end of the central shaft rotatably connected to the rear end cover.

[0007] In a further embodiment of the present invention, the idler gear assembly includes a planetary carrier fixed to the front end cover, on which a plurality of planetary gears are rotatably disposed, and the plurality of planetary gears are respectively meshed with and connected to the sun gear and the external gear ring.

[0008] In a further embodiment of the present invention, the EMG power generation component further includes a first mounting ring and a second mounting ring that are fixedly connected to the sun gear and the external gear ring respectively and rotate in the opposite direction therewith, as well as a plurality of first fixing rings and second fixing rings; A plurality of first fixing rings are circumferentially fixed to the side of the second mounting ring facing away from the front end cover, and each first fixing ring is embedded with the permanent magnet. A plurality of second fixing rings are circumferentially fixed to the side of the first mounting ring facing the front end cover, and each second fixing ring is embedded with the coil.

[0009] In a further embodiment of the present invention, connecting seats are fixedly connected to both sides of the upper surface of the support plate, a rotating shaft is rotatably connected between the connecting seats, the lower end of the cantilever is fixedly connected to the rotating shaft, and an L-shaped connecting plate that restricts the rotation angle is fixedly connected to the bottom end of the cantilever.

[0010] In a further embodiment of the present invention, four grooves are evenly distributed around the inner surface of the outer rotor, and the friction material includes a plurality of polymer films disposed on the outer surface of the inner rotor, and flexible hair strips disposed inside the grooves.

[0011] In a further embodiment of the present invention, the copper electrode includes a first electrode and a second electrode, which are alternately disposed on the inner surface of the outer rotor.

[0012] A further embodiment of the present invention includes a conductive ring, which is fixedly connected to one end of the central input shaft near the rear end cover, and the conductive ring is electrically connected to the coil and the copper electrode.

[0013] In a further embodiment of the present invention, a plurality of first connecting blocks are fixedly connected to the outer side wall of the outer gear ring in a circumferential manner, and a plurality of second connecting blocks are fixedly connected to the outer side wall of the outer rotor in a circumferential manner, and the first connecting blocks and the second connecting blocks are fixedly connected by connecting rods.

[0014] In a further embodiment of the present invention, a radial non-contact gap is provided between the inner rotor and the outer rotor.

[0015] (3) Beneficial effects This invention utilizes an oscillating float cantilever mechanism consisting of a float and a cantilever. The float directly contacts the waves and generates a reciprocating up-and-down motion, while the cantilever transmits displacement and velocity, converting dispersed wave kinetic energy into a concentrated and stable mechanical driving force. This solves the problem of insufficient energy capture in traditional drive mechanisms. Furthermore, through a bidirectional-to-unidirectional mechanism, the circular reciprocating oscillation of the drive shaft can be converted into a continuous unidirectional rotation of the central shaft, directly capturing the impact force generated by wave undulations as power input. The forward rotation power of the central shaft is separated into forward and reverse directions through an idler gear assembly and a sun gear. The sun gear, directly connected to the central shaft, rotates forward with the shaft and drives the outer gear ring to rotate in reverse through meshing planetary gears, causing the two sets of power generation components to move in opposite directions. This significantly increases the average output power and enhances the device's ability to collect ocean wave energy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the complete external structure of the wave energy power generation device in this invention; Figure 2 This is a schematic diagram of the bidirectional-to-unidirectional mechanism structure in this invention; Figure 3 This is a schematic diagram of the installation structure of the limiting bearing and conductive ring in this invention; Figure 4 This is a schematic diagram of the planetary gear and sun gear mounting structure in this invention; Figure 5 This is a schematic diagram of the first mounting ring structure in this invention; Figure 6 This is a schematic diagram of the second mounting ring structure in this invention; Figure 7 This is a schematic diagram of the permanent magnet mounting structure in this invention; Figure 8 This is a schematic diagram of the coil mounting structure in this invention; Figure 9 This is a schematic diagram of the inner rotor structure in this invention; Figure 10 This is a schematic diagram of the outer rotor structure in this invention; Figure 11 This is a schematic diagram of the TENG power generation principle in this invention; Figure 12 This is a schematic diagram of the EMG power generation principle in this invention.

[0017] The attached figures are labeled as follows: 1. Float; 2. Support plate; 201. Connecting frame; 202. Rotating shaft; 3. Cantilever; 301. L-shaped connecting plate; 4. Fixing seat; 5. Bidirectional to unidirectional mechanism; 6. Drive shaft; 7. Front end cover; 8. Outer shell; 9. Rear end cover; 10. First bevel gear; 11. Second bevel gear; 12. Third bevel gear; 13. Central shaft; 14. Planetary carrier; 15. Sun gear; 16. Planetary gear; 17. Limit bearing; 18. External gear ring; 19. Connecting rod; 20. First connecting block; 21. External rotor; 22. Second connecting block; 23. Internal rotor; 24. Conductive ring; 25. First mounting ring; 26. Second mounting ring; 27. First fixing ring; 28. Permanent magnet; 29. ​​Second fixing ring; 30. Coil; 31. Fixing frame; 32. Polymer film; 33. First electrode; 34. Second electrode; 35. Groove; 36. Flexible strip. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0020] Unless otherwise defined, 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. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Example 1 like Figure 1 As shown, a wave energy generation device aims to overcome the technical deficiencies of existing single-generation wave energy harvesting devices in terms of low-frequency adaptability, energy conversion efficiency, and output stability. Through the integrated design of an oscillating float cantilever mechanism and a triboelectric-electromagnetic composite power generation module, it achieves efficient capture and stable conversion of ocean wave energy. Its overall structure includes a float 1, a support plate 2, a cantilever 3, a composite power generation mechanism, and a bidirectional-to-unidirectional mechanism 5.

[0022] A float 1 is placed in seawater to capture wave energy, and its upper end is fixedly connected to a support plate 2, which is preferably made of carbon fiber. Connecting frames 201 are fixed to both sides of the upper surface of the support plate 2, and a rotating shaft 202 is rotatably connected between the two connecting frames 201. The lower end of a cantilever 3 is fixed to the rotating shaft 202 and swings through the shaft; its bottom end is also fixed with an L-shaped connecting plate 301 to limit the swing angle of the cantilever 3 to between 90° and 180°, preventing excessive rotation of the cantilever 3 and collision with the float 1. The upper end of the cantilever 3 is connected to a bidirectional-to-unidirectional mechanism 5, which is in turn connected to the central shaft 13 of the composite power generation mechanism. Under the action of waves, the float 1 drives the support plate 2 to rise and fall, thereby driving the cantilever 3 to reciprocate; the bidirectional-to-unidirectional mechanism 5 converts the bidirectional reciprocating swing of the cantilever 3 into a unidirectional continuous rotation of the central shaft 13, thereby driving the composite power generation mechanism to generate electricity.

[0023] like Figures 2 to 4 As shown, the composite power generation mechanism includes a housing 8, a front cover 7, a rear cover 9, a central shaft 13, a reversing mechanism, an inner rotor 23, an outer rotor 21, an electromagnetic power generation component (EMG), and a triboelectric nanogenerator (TENG). The front cover 7 and the rear cover 9 are respectively fixed to the axial ends of the housing 8. The housing 8 is fixedly connected to the power generation platform support on the sea surface. The central shaft 13 passes through and is rotatably supported between the two covers. The reversing mechanism is located inside the housing 8 and includes an idler gear assembly, a sun gear 15, and an external gear ring 18. The idler gear assembly includes a planet carrier 14 fixed to the front cover 7 and three planet gears 16 rotatably mounted on the planet carrier 14; a sun gear 15 fixed to the central shaft 13 and meshing with the planet gears 16; and an external gear ring 18 meshing with the planet gears 16. The external gear ring 18 is rotatably connected to the front cover 7 through a limit bearing 17. The sun gear 15, planet gears 16, and external gear ring 18 have the same module and pressure angle, and their rotation centers coincide, satisfying that the number of teeth on the external gear ring 18 is equal to the number of teeth on the sun gear 15 plus twice the number of teeth on the planet gears 16 (example number of teeth: 18 teeth on the sun gear, 27 teeth on the planet gears, and 72 teeth on the external gear ring, with a transmission ratio of 4:1). The three planet gears 16 are evenly distributed circumferentially (with an included angle of 120°). Several first connecting blocks 20 are fixed circumferentially on the outer side of the external gear ring 18, and several second connecting blocks 22 are correspondingly fixed on the outer side of the external rotor 21. The two are fixedly connected by a connecting rod 19, so that the external rotor 21 rotates synchronously with the external gear ring 18. The inner rotor 23 is fixed to the central shaft 13 by a fixing bracket 31 and rotates in the same direction as the central shaft 13 and the sun gear 15. A radial non-contact gap (about 1 mm) is provided between the outer surface of the inner rotor 23 and the inner surface of the outer rotor 21 to avoid mechanical friction.

[0024] like Figures 5 to 8 and Figure 12As shown, the EMG power generation assembly includes a first mounting ring 25 fixed to the back of the sun gear 15 and a second mounting ring 26 fixed to the back of the external gear ring 18. Multiple second fixing rings 29 are circumferentially fixed to the side of the first mounting ring 25 facing the second mounting ring 26, each ring containing a coil 30. Multiple first fixing rings 27 are circumferentially fixed to the side of the second mounting ring 26 facing the first mounting ring 25, each ring containing a permanent magnet 28. When the sun gear 15 and the external gear ring 18 rotate in opposite directions under planetary gear transmission, the first mounting ring 25 and the second mounting ring 26 also rotate in opposite directions, causing a doubled relative velocity between the coil 30 and the permanent magnet 28, increasing the rate of change of magnetic flux, thereby inducing a stronger alternating current in the coil 30.

[0025] like Figures 9 to 11 As shown, the TENG power generation component includes several polymer films 32 disposed on the outer surface of the inner rotor 23, and alternating first electrodes 33 and second electrodes 34 disposed on the inner surface of the outer rotor 21. The polymer films 32 are preferably made of fluorine-containing materials with good electronegativity, such as FEP, PVDF, or PTFE, with a thickness ranging from 25 to 200 μm, preferably 30 μm. The electrode materials are copper or aluminum, and can be copper foil or aluminum foil, with a thickness ranging from 50 nm to 1 mm, preferably 0.1 mm. Four grooves 35 are uniformly formed circumferentially on the inner surface of the outer rotor 21. Each groove 35 contains a flexible strip 36 made of flexible fur or nylon fibers, used to rub against the polymer films 32 during rotation and replenish surface charge. The first electrodes 33 are connected in series by wires, and the second electrodes 34 are connected in series by wires. When the inner rotor 23 and the outer rotor 21 rotate in opposite directions, a periodic induced potential difference is generated between the polymer films 32 and the alternating electrodes, driving electrons to form an AC output through an external circuit.

[0026] like Figure 3 As shown, a conductive ring 24 is fixed at one end of the central shaft 13 near the rear end cover 9, which is connected to the coil 30, the first electrode 33, and the second electrode 34 respectively through built-in wires. A brush is correspondingly provided inside the outer casing 8. The brush is pressed against the track of the conductive ring 24 by an elastic element to achieve sliding electrical contact, and the electrical energy is led out to the external load through the wires.

[0027] like Figures 1 to 4As shown, the bidirectional-to-unidirectional mechanism 5 includes a fixed base 4 fixed to the front end cover 7, with drive shafts 6 rotatably mounted on both sides perpendicular to the central shaft 13. The outer end of each drive shaft 6 is fixed to the upper end of the corresponding cantilever 3. A second bevel gear 11 and a third bevel gear 12 are sequentially fitted onto one end of the central shaft 13 that extends into the fixed base 4. The two bevel gears are connected to the central shaft 13 via one-way bearings, and the locking directions of the two one-way bearings are opposite. The inner end of any one-way drive shaft 6 extends into the fixed base 4 and fixes a first bevel gear 10, which simultaneously meshes with the second bevel gear 11 and the third bevel gear 12. When the drive shaft 6 drives the first bevel gear 10 to rotate counterclockwise, the power is transmitted to the central shaft 13 through the second bevel gear 11. At this time, the one-way bearing on the side of the third bevel gear 12 slips. When the first bevel gear 10 rotates clockwise, the power is transmitted to the central shaft 13 through the third bevel gear 12. The one-way bearing on the side of the second bevel gear 11 slips, thereby realizing the continuous one-way rotation of the central shaft 13 under the bidirectional swing of the cantilever 3.

[0028] Example 2 This embodiment serves as a supplement and extension to Embodiment 1, illustrating the variability of the technical solution of the present invention.

[0029] The inner rotor 23 and outer rotor 21 in the TENG power generation module are not limited to cylindrical shapes. Under the premise of ensuring opposite relative motion, they can be equivalently replaced by structures such as relatively rotating disks.

[0030] The primary mechanism for converting wave motion into rotational motion is not limited to the cantilever 3-float 1 system in this embodiment. It can also be a gear-rack, slider-crank, or other mechanism that can convert reciprocating linear motion into rotational motion. Depending on the different output power requirements, the number or arrangement density of permanent magnets 28, coils 30, first electrodes 33, second electrodes 34 and polymer films 32 in each power generation unit can be increased, provided space permits.

[0031] The shape of the outer shell of the composite power generation mechanism is not limited to a cylindrical shape. It can be designed as a spherical or cuboid shape according to the needs of the installation environment. The material can be acrylic or other engineering plastics.

[0032] General working principle: Through the coordinated action of float 1, support plate 2, and cantilever 3, the wave undulation motion is transformed into circular reciprocating oscillation. Then, through the bidirectional to unidirectional mechanism 5, the circular reciprocating oscillation is transformed into the continuous unidirectional rotation motion of the central shaft 13, thereby driving the composite power generation mechanism to generate electricity. When the drive shaft 6 drives the first bevel gear 10 to rotate counterclockwise, the power is transmitted to the central shaft 13 through the second bevel gear 11, and the one-way bearing inside the third bevel gear 12 slips. When the drive shaft 6 drives the first bevel gear 10 to rotate clockwise, the power is transmitted to the central shaft 13 through the third bevel gear 12, and the one-way bearing inside the second bevel gear 11 slips, thus achieving continuous unidirectional rotation. The planetary carrier 14 is fixed, and the central shaft 13 drives the sun gear 15 to rotate in one direction. The sun gear 15 meshes with the planet gear 16 and drives it to rotate clockwise. The planet gear 16 meshes with the outer gear ring 18 and drives it to rotate counterclockwise. The permanent magnets 28 are distributed on the first mounting ring 25 on the back of the sun gear 15, and the coils 30 are distributed on the second mounting ring 26 on the back of the outer gear ring 18. The outer gear ring 18 drives the outer rotor 21 to rotate counterclockwise through four connecting rods 19. The inner rotor 23 rotates clockwise with the sun gear 15, realizing the opposite movement of the outer rotor 21 and the inner rotor 23. Based on the coupling mechanism of triboelectric effect and electrostatic induction, the inner rotor 23 rotates counterclockwise and the outer rotor 21 rotates clockwise. Interdigitated copper electrodes (first electrode 33 and second electrode 34) are alternately arranged on the inner surface of the outer rotor 21, forming a one-to-one configuration with the polymer film 32 on the outer surface of the inner rotor 23. Flexible hair strips 36 are placed every 90° along the entire circumference of the outer rotor 21, serving a charging function. In the initial state, the polymer film 32 and the copper electrodes carry equal amounts of opposite charges. When subjected to external excitation, the inner rotor 23 and the outer rotor 21 rotate in opposite directions, causing an inductive mismatch between the polymer film 32 and the copper electrodes. This mismatch induces a potential difference between the copper electrodes, driving free electrons from right to left through the external load, thus generating a current flowing from left to right. As the reverse rotation continues, driven by the high surface potential of the polymer film 32, a reverse current is generated in the circuit. Because the inner rotor 23 and the outer rotor 21 move periodically under external excitation, they can continuously generate AC signals. Based on the law of electromagnetic induction, when the permanent magnet 28 rotates and sweeps across the coil 30, the magnetic flux passing through the coil 30 undergoes a periodic "rise-fall" change. According to Lenz's law, the induced current generated in the coil 30 forms a reverse magnetic field that opposes the change in magnetic flux, causing the current direction to reverse. Through the ring-shaped periodic arrangement of the permanent magnet 28, the induced current is continuously generated, and finally, a continuous alternating current is output.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A wave energy power plant, characterized in that The utility model relates to a kind of EMG and TENG hybrid generator, including: Float; Supporting plate, fixedly connected in the upper end of float; Front end cover, central position rotationally connected with central shaft; Two-way into single mechanism, including fixed seat fixedly connected on front end cover, central shaft one end extends into the inside of fixed seat, and its end part is connected with second bevel gear and third bevel gear respectively through one-way bearing and central shaft, further including transmission shaft rotationally arranged in the both sides of fixed seat, the inner end of transmission shaft located in one side extends into fixed seat and is fixedly connected with the first bevel gear meshing with second bevel gear and third bevel gear; Cantilever, lower end is rotationally connected with the upper side of both ends of supporting plate, upper end is fixedly connected with corresponding transmission shaft respectively; Reversing mechanism, including sun gear fixedly connected on central shaft, outer gear ring rotationally connected on front end cover through limit bearing, sun gear drives outer gear ring reverse rotation through idler assembly; EMG power generation assembly, including coil and permanent magnet respectively arranged on sun gear and outer gear ring; TENG power generation assembly, including inner rotor fixedly connected on central shaft, outer rotor connected with outer gear ring, inner rotor outer side and outer rotor inner side are provided with friction material of friction contact, and outer rotor inner side is provided with several copper electrodes.

2. A wave power plant according to claim 1, characterised in that Further including shell, shell is fixedly connected behind front end cover, the shell is fixedly connected with rear end cover, and the rear end of central shaft is rotationally connected with rear end cover.

3. A wave power plant according to claim 1, characterised in that The idler assembly includes a planet carrier fixed to the front end cover, and a plurality of planet gears rotationally arranged on the planet carrier, wherein the plurality of planet gears are meshingly connected with the sun gear and the outer gear ring.

4. A wave power plant according to claim 1, characterised in that The EMG power generation assembly further includes a first mounting ring and a second mounting ring fixedly connected with the sun gear and the outer gear ring respectively and reversely rotated with the sun gear and the outer gear ring, and a plurality of first fixed rings and second fixed rings. A plurality of the first fixed rings are fixedly arranged on the second mounting ring away from the front end cover, and each first fixed ring is embedded with the permanent magnet.

5. A wave power plant according to claim 1, characterised in that The upper surface of the supporting plate is fixedly connected with a connecting seat on both sides, a rotating shaft is rotationally connected between the connecting seats, the lower end of the cantilever is fixedly connected with the rotating shaft, and an L-shaped connecting plate is fixedly connected to the bottom end of the cantilever to limit the rotation angle.

6. A wave power plant according to claim 1, characterised in that The inner surface of the outer rotor is uniformly distributed with four grooves, and the friction material includes a plurality of polymer films arranged on the outer surface of the inner rotor and flexible wool arranged in the grooves.

7. A wave power plant according to claim 1, characterised in that The copper electrodes include first electrodes and second electrodes, which are alternately arranged on the inner surface of the outer rotor.

8. A wave power plant according to claim 1, characterised in that Further including a conductive ring, the conductive ring is fixedly connected to one end of the central input shaft close to the rear end cover, and the conductive ring is electrically connected with the coil and the copper electrode.

9. A wave power plant according to claim 1, characterised in that The outer side wall of the outer gear ring is fixedly connected with a plurality of first connecting blocks in the circumferential direction, and the outer side wall of the outer rotor is fixedly connected with a plurality of second connecting blocks in the circumferential direction.

10. A wave power plant according to claim 1, characterised in that The inner rotor and the outer rotor are provided with a radial non-contact gap.

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