CN116436333A - Composite nano generator for collecting low-frequency water wave energy - Google Patents

Abstract

The invention provides a composite nano generator for collecting low-frequency water wave energy, which comprises a shell, wherein a driving assembly is movably arranged on the shell, a friction power generation assembly and an electromagnetic power generation assembly are arranged in the shell, and 2n first permanent magnets are fixedly arranged on the driving assembly in the shell; 2n second permanent magnets are movably arranged in the shell, and the magnetism of the second permanent magnets is matched with that of the first permanent magnets; the friction power generation assembly and the electromagnetic power generation assembly are both arranged near the second permanent magnet and are both coupled with the second permanent magnet and the first permanent magnet. According to the invention, electromagnetic power generation and friction power generation are well coupled, and the motion of the permanent magnet not only enables the friction power generation to generate alternating current output, but also generates a lower sinusoidal signal in the electromagnetic power generation, and the motion of the movable plate in the friction power generation generates a higher spike wave in the electromagnetic power generation, so that the overall energy collection efficiency is improved, and the application range is greatly widened.

Description

Composite nano generator for collecting low-frequency water wave energy

Technical Field

The invention relates to the technical field of nano generators, in particular to a composite nano generator for collecting low-frequency water wave energy.

Background

With the rapid development of modern society, higher and higher requirements are put on energy. The great consumption of fossil fuels such as coal, petroleum and natural gas, and natural harmful greenhouse gases such as carbon dioxide discharged from the combustion of these fossil fuels have led to an increasing attention to energy and environment in recent decades. Renewable energy sources such as solar energy, wind energy and water energy are widely available and have little natural hazard and are used as substitutes for conventional fuels. The ocean energy is an ideal energy source because of rich reserves, renewable, clean and wide distribution. However, the large-scale ocean energy collection by using the traditional electromagnetic induction generator has many challenges due to low water wave frequency, large distribution area, random wave peaks and high cost. The friction nano generator is combined with the electromagnetic generator, so that the advantages of the friction nano generator and the electromagnetic generator are complemented, and the energy conversion efficiency is improved. And a better solution is provided for the collection of water wave energy. The magnets in the existing composite generators are only used for generating induced electromotive force, and the advantages of the magnets are not fully utilized. Therefore, there is an urgent need for a structural design that can sufficiently couple an electromagnetic generator and a friction generator and sufficiently utilize the characteristics of magnets. Therefore, the invention designs a composite nano generator for collecting low-frequency water wave energy.

The invention patent application with the application number of 202111296190.2 discloses a friction-electromagnetic composite power generation device, which comprises a rotor part, a stator part and a central shaft, wherein the rotor part and the stator part are sleeved on the central shaft, and two sides of the rotor part in the axial direction are sleeved with one stator part; the rotor part is provided with a rotor plate, a magnet array and a blade array, the magnet array is fixed on the rotor plate, two axial ends of the rotor plate are fixedly connected with one blade array, and the blade array is provided with a first dielectric film; the stator part is provided with a stator plate, a coil array, an electrode array and a friction layer, the coil array is fixed on the stator plate, the electrode array is fixedly connected with the inner axial surface of the stator plate, and the friction layer formed by the second dielectric film covers the electrode array; the rubbing layer is in contact with a first dielectric film on the blade array, and the first dielectric film and the second dielectric film have electrode sequence differences. The device improves the energy conversion efficiency of power generation. However, the invention is complex, and the electromagnetic generator and the friction generator are not coupled and work independently of each other.

Disclosure of Invention

Aiming at the technical problems that the existing composite generator is complex in structure, friction power generation and electromagnetic power generation work independently and different in functional requirement, the invention provides the composite nano generator for collecting low-frequency water wave energy, which effectively combines the friction power generation and the electromagnetic power generation together, gives full play to respective advantages, realizes mutual promotion of the friction power generation and the electromagnetic power generation, improves the overall output efficiency and realizes the frequency doubling effect.

In order to achieve the above purpose, the technical scheme of the invention is realized as follows: the composite nano generator for collecting low-frequency water wave energy comprises a shell, wherein a driving assembly is movably arranged on the shell, a friction power generation assembly and an electromagnetic power generation assembly are arranged in the shell, and 2n first permanent magnets are fixedly arranged on the driving assembly in the shell; 2n second permanent magnets are movably arranged in the shell, and the magnetism of the second permanent magnets is matched with that of the first permanent magnets; the friction power generation assembly and the electromagnetic power generation assembly are both arranged near the second permanent magnet and are both coupled with the second permanent magnet and the first permanent magnet; wherein n is a positive integer.

Preferably, the driving assembly is a hydraulic driving assembly, the driving assembly comprises a fan blade and a rotating shaft, the fan blade is arranged on the outer side of the shell, the rotating shaft is movably connected with the shell, the fan blade is fixed at one end of the rotating shaft, the other end of the rotating shaft stretches into the shell, and a first permanent magnet is fixed at the other end of the rotating shaft.

Preferably, the friction power generation assembly comprises 2n friction units, and the friction units are connected with the second permanent magnet; the friction unit comprises an FEP film and two electrodes, wherein the FEP film and one electrode are fixed on the second permanent magnet, and the other electrode is arranged on one side of the second permanent magnet; the FEP film and the electrode are contacted or separated from each other under the driving of the second permanent magnet.

Preferably, the electromagnetic generating assembly comprises 2n generating coils, and the generating coils are fixedly arranged between the second permanent magnet and the first permanent magnet.

Preferably, the number of the second permanent magnets and the number of the first permanent magnets are 4, and the shell is a hollow cylinder; the 4 first permanent magnets are fixed at the other end of the rotating shaft at equal intervals at 90 degrees in sequence in opposite magnetic directions, and the 4 second permanent magnets and the first permanent magnets are arranged in a homopolar movable mode.

Preferably, the second permanent magnet is fixed on the movable plate, and the FEP film is fixed on both sides of the movable plate; the movable plate is arranged on the support column in a sliding manner, both ends of the support column are provided with fixed plates, and one side of the fixed plates, which is close to the movable plate, is fixed with an electrode; the power generation coil is fixed on the fixed plate between the movable plate and the first permanent magnet; the fixed plate is fixed on the inner wall of the shell.

Preferably, the FEP film is fixed on a fixed electrode, the fixed electrode is fixed on two sides of the movable plate, and the power generation coil, the fixed electrode and the electrode are led out of the shell through leads.

Preferably, the first permanent magnet is fixed on the rotating rods, and the four rotating rods are uniformly fixed on the outer circumference of the other end of the rotating shaft.

Preferably, the first permanent magnet rotates along with the rotation of the rotating shaft, and the first permanent magnet and the second permanent magnet generate periodical attraction and repulsion, so that the movable plate is driven to move between the two fixed plates, and the FEP film of the friction layer is periodically contacted with and separated from the electrode; every 90 degrees of rotation of the rotating shaft, the FEP film and the electrode are in contact separation for 4 times, and every 16 times of contact separation are realized when the rotating shaft rotates for one circle, so that 16 times of frequency multiplication is realized;

the rotation of the first permanent magnet generates a small uniform sine wave in the power generation coil, the second permanent magnet generates a large spike wave in the power generation coil along with the movement of the movable plate, and the power generation coil cuts the magnetic induction line in the relative movement to generate induced electromotive force.

Preferably, in a certain stable state, the four electrodes and the fixed electrode which are contacted are divided into a group of generating units, the four separated electrodes and the fixed electrode are divided into a group of generating units, certain phase difference exists between the two groups of generating units, the fixed electrode and the contact separation electrode are respectively led out of the wires, and the two led out wires are connected to form a generating loop.

Compared with the prior art, the invention has the beneficial effects that: the micro-energy collector based on the coupling effect of contact electrification and electrostatic induction is low in cost, strong in portability, long in service life and free of pollution, and the low-frequency water wave energy is efficiently collected by combining the frequency doubling characteristic of the micro-energy collector. According to the invention, electromagnetic power generation and friction power generation are well coupled, and the motion of the permanent magnet not only enables the friction power generation to generate alternating current output, but also generates a lower sinusoidal signal in the electromagnetic power generation, and the motion of the movable plate in the friction power generation generates a higher spike wave in the electromagnetic power generation, so that the overall energy collection efficiency is improved, and the application range is greatly widened.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a block diagram of the power generation assembly of the present invention.

Fig. 3 is a schematic diagram of the operation of the present invention for generating electricity.

Fig. 4 is a graph of simulation during operation of the present invention, where (a) is an open circuit voltage of the friction generating element under different external mechanical energy excitation, (b) is a short circuit current under different external mechanical energy excitation, (c) is an EMG short circuit current of the electromagnetic generating element under the condition that the movable plate is not involved, (d) is an EMG open circuit voltage of the electromagnetic generating element under the condition that the movable plate is not involved, (e) is an EMG short circuit current of the electromagnetic generating element under the condition that the movable plate is involved, (f) is an EMG open circuit voltage of the electromagnetic generating element under the condition that the movable plate is involved, (g) is a root mean square of EMG open circuit voltage of the electromagnetic generating element under the condition that the movable plate is not involved, (h) is a root mean square of EMG open circuit voltage of the electromagnetic generating element under the condition that the movable plate is involved, and (i) and (j) are increasing curves of current and power, respectively, if the movable plate is involved.

In the figure, 1 is a shell, 2 is a friction power generation assembly, 21 is an FEP film, 22 is an electrode, 23 is a movable plate, 24 is a support column, 25 is a fixed plate, 26 is a fixed electrode, 3 is an electromagnetic power generation assembly, and 31 is a power generation coil. 4 is a driving component, 41 is a rotating shaft, 42 is a fan blade, 5 is a first permanent magnet, 6 is a second permanent magnet, and 7 is a rotating rod.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1, a composite nano generator for collecting low-frequency water wave energy comprises a shell 1, wherein a driving component 4 is movably arranged on the shell 1, and the driving component 4 can rotate relative to the shell 1. The friction power generation assembly 2 and the electromagnetic power generation assembly 3 are arranged in the shell 1, the friction power generation assembly 2 generates power through friction of a friction layer, and the electromagnetic power generation assembly 3 generates power through cutting magnetic induction lines in a magnetic field through a power generation coil. 2n first permanent magnets 5 are fixedly arranged on the driving component 4 in the shell 1, and the first permanent magnets 5 rotate in the shell 1 under the driving of the driving component 4 to cause the change of a magnetic field. 2n second permanent magnets 6 are movably arranged in the shell 1, the magnetism of the second permanent magnets 6 is matched with that of the first permanent magnets 5, and the first permanent magnets 5 cause movement of the second permanent magnets 6 in rotation, so that contact and separation of a magnetic field and a friction layer of the friction power generation assembly 2 are caused, and power generation of the friction power generation assembly 2 and power generation of the electromagnetic power generation assembly 3 are realized. The friction power generation assembly 2 and the electromagnetic power generation assembly 3 are arranged near the second permanent magnet 6, and the friction power generation assembly 2 and the electromagnetic power generation assembly 3 are coupled with the second permanent magnet 6 and the first permanent magnet 5; wherein n is a positive integer. That is, the generating coils in the electromagnetic generating assembly 3 are respectively matched with the second permanent magnet 6 and the first permanent magnet 5, and can generate electricity in a magnetic field. The friction power generation assembly 2 is driven by the second permanent magnet 6 to perform friction electrification. The second permanent magnet 6 and the first permanent magnet 5 are shared by the friction power generation assembly 2 and the electromagnetic power generation assembly 3, the driving assembly 4 is driven to rotate by external force, the first permanent magnet is driven to rotate, periodic adsorption and repulsion of the magnets of the second permanent magnet 6 and the first permanent magnet 5 are realized, and friction power generation and electromagnetic power generation are carried out simultaneously. The permanent magnet is not only used for providing a stable magnetic field, but also can provide power for friction power generation.

As shown in fig. 1, the driving assembly 4 is a hydraulic driving assembly, the driving assembly 4 includes a fan blade 42 and a rotating shaft 41, the fan blade 42 is disposed on the outer side of the housing 1, the fan blade 42 is an L-shaped plate, a horizontal section of the L-shaped plate is parallel to the housing 1, and two ends of a vertical section of the L-shaped plate are fixedly connected with the horizontal section and the rotating shaft respectively. The rotating shaft 41 is movably connected with the shell 1 through a bearing, the fan blades 42 are fixed at one end of the rotating shaft 41, the other end of the rotating shaft 41 stretches into the shell 1, and the other end of the rotating shaft 41 is fixed with the first permanent magnet 5. When external water force acts on the fan blades, the fan blades rotate to drive the rotating shafts to generate rotary motion, so that the first permanent magnet 5 rotates in the shell 1, the magnetic field in the shell periodically changes, the magnetic field and the second permanent magnet periodically attract and repel each other, the movable plate and the fixed plate periodically contact and separate, and the friction power generation assembly and the electromagnetic power generation assembly work simultaneously, and electric energy is output to an external circuit. The casing 1 is hollow cylinder, and the both ends of cylinder are equipped with two bottom plates, and casing 1 plays sealed and the effect of supporting, provides stable operational environment for inside. The friction power generation assembly 2, one end of the rotating shaft, the electromagnetic power generation assembly 3, the second permanent magnet 6 and the first permanent magnet 5 are all arranged in the shell 1. 3D printing of a cylinder in the middle of the shell 1 by using a polylactide material; the upper bottom plate and the lower bottom plate are cut by an acrylic plate through a laser engraving machine, so that the processing is convenient, and the materials are easy to obtain.

Further, the friction power generation assembly 2 comprises 2n friction units, and the friction units are connected with the second permanent magnets 6; the friction unit comprises an FEP film 21 and two electrodes 22, wherein the FEP film 21 and the electrodes 22 are fixed on the second permanent magnet 6, and the other electrode 22 is arranged on one side of a fixed plate 25 of the second permanent magnet 6; the FEP film 21 and the electrode 22 are contacted with or separated from each other under the driving of the second permanent magnet 6. That is, the electrode 22 may be provided on the second permanent magnet 6 so as to move in accordance with the movement of the second permanent magnet 6, the FEP film 21 may be fixed to the inner wall of the case, and the electrode 22 may be brought into contact with or separated from the FEP film 21. The electromagnetic generating assembly 3 comprises 2n generating coils 31, a second permanent magnet 6 and a first permanent magnet 5, wherein the generating coils 31 are fixedly arranged between the second permanent magnet 6 and the first permanent magnet 5. The generating coil 31 cuts lines of magnetic induction in the varying magnetic field generated by the second permanent magnet 6 and the first permanent magnet 5 to generate electromotive force.

As shown in fig. 2 and fig. 3, the number of the second permanent magnets 6 and the first permanent magnets 5 is 4, the 4 first permanent magnets 5 are fixed at the other end of the rotating shaft 41 at equal intervals of 90 ° in opposite order, and the 4 second permanent magnets 6 and the first permanent magnets 5 are movably arranged with opposite polarities. The first permanent magnet 5 rotates to cause the magnetic field to change, so as to drive the second permanent magnet 6 to move, thereby realizing friction electrification and electromagnetic power generation. As shown in fig. 3, the N poles of the 4 second permanent magnets 6 are close to the rotating shaft 41,4, adjacent magnetism is opposite, and opposite magnetism is the same in the first permanent magnets 5, namely, the N poles of two opposite first permanent magnets 5 are close to the rotating shaft 41, and the S poles of the other two opposite first permanent magnets 5 are close to the rotating shaft 41, so that periodic attraction and repulsion to the second permanent magnets 6 are realized in the rotation of the first permanent magnets 5, and the power generation coil cutting magnetic induction line power generation and friction layer friction electrification are realized.

Further, in order to ensure stable movement of the second permanent magnet 6 and frictional electrification of the friction unit, the second permanent magnet 6 is fixed on the movable plate 23, and FEP films 21 are fixed on both sides of the movable plate 23; the movable plate 23 is slidably arranged on the supporting column 24, and the supporting column 24 limits the movable plate 23. Both ends of the support column 24 are provided with a fixed plate 25, and one side of the fixed plate 25, which is close to the movable plate 23, is fixed with an electrode 22; the electrodes are copper electrodes, matching the FEP film 21. The power generation coil 31 is embedded and fixed on the fixed plate 25 between the movable plate 23 and the first permanent magnet 5, and the power generation coil 31 is led out through the lead penetrating out of the shell 1; the fixing plate 25 is fixed to the inner wall of the housing 1. Therefore, the 4 friction power generation units are arranged in a quadrilateral mode around the rotating shaft, and the inner space of the cylinder is fully utilized. The friction layer of each friction power generation unit is selected from copper electrodes and FEP films, the copper electrodes are attached to one side of the fixed plate opposite to the movable plate and two sides of the movable plate, and the FEP films are attached to the surface of the copper electrodes of the movable plate. The copper electrodes are led out respectively through a lead penetrating out of the supporting plate.

The FEP film 21 is fixed on both sides of the movable plate 23, the fixed electrode 26 is fixed on the inner side of the fixed plate 25, and the generator coil 31, the fixed electrode 26 and the electrode 22 are led out of the housing 1 through wires. In a certain stable state, the four electrodes and the fixed electrodes which are contacted are divided into a group of power generation units, the four separated fixed electrodes and electrodes are divided into a group of power generation units, the two groups of power generation units have a certain phase difference, the fixed electrodes and the contact separation electrodes are respectively led out of the wires, and the two led out wires are connected to form a power generation loop.

The first permanent magnet 5 is fixed on the rotating rods 7, and the four rotating rods 7 are uniformly fixed on the outer circumference of the other end of the rotating shaft 41. The rotating rod 7 realizes the fixation of the first permanent magnet 5 and simultaneously ensures the stability of two opposite permanent magnets.

Each friction power generation unit comprises 2 four corners of a fixed plate 25, wherein the four corners of the fixed plate are fixed through 4 support columns, a power generation coil is placed in the middle of one fixed plate, one layer of foam rubber is stuck on one side of the fixed plate, a layer of copper electrode is attached to the foam rubber, a movable plate is placed in the middle of the two fixed plates, a permanent magnet is embedded in the center of the movable plate, a layer of foam rubber is respectively attached to two sides of the movable plate, and a layer of FEP film is attached to the foam rubber; the 4 friction power generation units are oppositely arranged. The inside pivot that includes of casing, 4 permanent magnets of the pivot other end are installed relatively, and adjacent two magnet magnetism is opposite, and pivot one end is arranged in the outside for drive assembly and is used for driving friction power generation unit work.

When in use, the first permanent magnet 5 rotates along with the rotation of the rotating shaft 41, and the first permanent magnet 5 and the second permanent magnet 6 generate periodical attraction and repulsion, so that the movable plate 23 is driven to move between the two fixed plates 25, and the FEP film 21 of the friction layer and the electrode 22 are periodically contacted and separated; when the rotating shaft 41 rotates by 90 degrees, the movable plate is contacted with one fixed plate at two sides under the action of repulsion or attraction of the magnet, and when the rotor continues to rotate by 90 degrees, the movable plate moves in the opposite direction to be contacted with the fixed plate at the other side. The FEP film 21 and the electrode 22 are contacted and separated for 4 times, and the contact and separation are carried out for 16 times when the rotating shaft 41 rotates for each circle, so that 16 times of frequency multiplication is realized, and the frequency multiplication effect of the composite nano generator is realized.

The rotation of the first permanent magnet 5 generates a small uniform sine wave in the power generation coil 31, the movement of the second permanent magnet 6 along with the movable plate 23 generates a large spike wave in the power generation coil 31, and the power generation coil cuts the magnetic induction line in the relative movement to generate induced electromotive force.

The composite nano generators of the invention mutually promote, and the two friction generators of the friction power generation assembly 2 have different phases, so that the connection mode of the friction generators is shown in figure 3, the ports are simplified, and the management is convenient. When the rotor rotates, as the permanent magnets are attached to the rotor, not only a lower alternating signal is generated in the generating coil, but also the movable plate provided with the permanent magnets is periodically attracted and repelled, so that the movable plate is periodically contacted and separated from the fixed plate, and an alternating signal is generated; in the moving process of the movable plate, the friction power generation unit works to generate alternating signals, and the electromagnetic power generation unit works to generate larger spike waves, so that the mutual coupling of friction power generation and electromagnetic power generation is realized.

Fig. 4 shows the promotion effect of the open-circuit voltage and the short-circuit current of the electromagnetic power generation assembly when the movable plate works and the promotion effect of the friction power generation assembly on the electromagnetic power generator when the friction power generation assembly works. When the movable plate moves, the friction power generation assembly TENG starts to work due to the contact and separation of the movable plate and the fixed plate, corresponding open-circuit voltage and short-circuit current are generated by the friction power generation assembly under different external stimuli as shown in (a) and (b) of fig. 4, frequencies in the graph represent different external mechanical energy stimuli, the voltage is relatively stable as can be seen by (a) and (b) of fig. 4, the current is increased firstly and then reduced, and the maximum is reached under the frequency of 1.4 Hz. The second permanent magnet embedded in the movable plate generates higher peak voltage and peak current in the power generation coil, and the EMG short circuit current and open circuit voltage under the condition that the movable plate does not participate are respectively shown in (e) and (f) of fig. 4, which illustrate that the movable plate generates peak current and peak voltage under the condition that the movable plate participates. When the movable plate does not work, the rotating shaft rotates, and only the electromagnetic generating component works at the moment, and the output voltage and the output current are shown in (c) and (d) of fig. 4, which shows that peak current and voltage cannot be generated under the condition that the movable plate does not participate. In order to determine the gain of the movable plate, the voltage and the current generated by the electromagnetic generating component are subjected to Fast Fourier Transform (FFT), and the result, that is, the root mean square of the EMG open circuit voltage of the movable plate under the condition of not participating and participating is shown in fig. 4 (g) and (h), respectively, shows that the friction generating unit reduces the working frequency of the rotating shaft through the root mean square of the voltage, but increases the output of electromagnetic generation. The current and power increase of the movable plate in the case of participation are shown in (i) and (j) of fig. 4, namely, the effect graph of the increase of the friction power generation on the electromagnetic power generation in the working process, and the comparison can show that the movement of the movable plate can indeed increase the performance output.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. The composite nano generator for collecting low-frequency water wave energy comprises a shell (1), and is characterized in that a driving assembly (4) is movably arranged on the shell (1), a friction power generation assembly (2) and an electromagnetic power generation assembly (3) are arranged in the shell (1), and 2n first permanent magnets (5) are fixedly arranged on the driving assembly (4) in the shell (1); 2n second permanent magnets (6) are movably arranged in the shell (1), and the magnetism of the second permanent magnets (6) is matched with that of the first permanent magnets (5); the friction power generation assembly (2) and the electromagnetic power generation assembly (3) are arranged near the second permanent magnet (6), and the friction power generation assembly (2) and the electromagnetic power generation assembly (3) are coupled with the second permanent magnet (6) and the first permanent magnet (5); wherein n is a positive integer.

2. The composite nano generator for collecting low-frequency water wave energy according to claim 1, wherein the driving component (4) is a hydraulic driving component, the driving component (4) comprises fan blades (42) and a rotating shaft (41), the fan blades (42) are arranged on the outer side of the shell (1), the rotating shaft (41) is movably connected with the shell (1), the fan blades (42) are fixed at one end of the rotating shaft (41), the other end of the rotating shaft (41) stretches into the shell (1), and a first permanent magnet (5) is fixed at the other end of the rotating shaft (41).

3. Composite nano-generator for collecting low frequency water wave energy according to claim 1 or 2, characterized in that the friction generating assembly (2) comprises 2n friction units connected with the second permanent magnet (6); the friction unit comprises an FEP (fluorinated ethylene propylene) film (21) and two electrodes (22), wherein the FEP film (21) and one electrode (22) are fixed on the second permanent magnet (6), and the other electrode (22) is arranged on one side of the second permanent magnet (6); the FEP film (21) and the electrode (22) are contacted with or separated from each other under the driving of the second permanent magnet (6).

4. A composite nano-generator for collecting low frequency water wave energy according to claim 3, wherein the electromagnetic generating assembly (3) comprises 2n generating coils (31), the generating coils (31) being fixedly arranged between the second permanent magnet (6) and the first permanent magnet (5).

5. The composite nano generator for collecting low-frequency water wave energy according to claim 4, wherein the number of the second permanent magnets (6) and the first permanent magnets (5) is 4, and the shell (1) is a hollow cylinder; the 4 first permanent magnets (5) are fixed at the other end of the rotating shaft (41) at equal intervals in sequence at 90 degrees in opposite magnetic mode, and the 4 second permanent magnets (6) and the first permanent magnets (5) are arranged in a homopolar opposite movable mode.

6. The composite nano generator for collecting low-frequency water wave energy according to claim 5, wherein the second permanent magnet (6) is fixed on a movable plate (23), and FEP films (21) are fixed on both sides of the movable plate (23); the movable plate (23) is arranged on the supporting column (24) in a sliding manner, both ends of the supporting column (24) are provided with fixed plates (25), and one side, close to the movable plate (23), of the fixed plates (25) is fixed with an electrode (22); the power generation coil (31) is fixed on the fixed plate (25) between the movable plate (23) and the first permanent magnet (5); the fixing plate (25) is fixed on the inner wall of the shell (1).

7. The composite nano-generator for collecting low-frequency water wave energy according to claim 6, wherein the FEP film (21) is fixed on the fixed electrode (26), the fixed electrode (26) is fixed on two sides of the movable plate (23), and the generating coil (31), the fixed electrode (26) and the electrode (22) are led out of the housing (1) through wires.

8. Composite nano generator for collecting low frequency water wave energy according to any of the claims 4-7, characterized in that the first permanent magnet (5) is fixed on the rotating rods (7), the four rotating rods (7) are uniformly fixed on the outer circumference of the other end of the rotating shaft (41).

9. The composite nano generator for collecting low-frequency water wave energy according to any one of claims 5 to 7, wherein the first permanent magnet (5) rotates along with the rotation of the rotating shaft (41), and the first permanent magnet (5) and the second permanent magnet (6) generate periodic attraction and repulsion, so as to drive the movable plate (23) to move between the two fixed plates (25), and the FEP film (21) of the friction layer and the electrode (22) are periodically contacted and separated; every 90 degrees of rotation of the rotating shaft (41), the FEP film (21) and the electrode (22) are in contact separation for 4 times, and every 16 times of contact separation are realized when the rotating shaft (41) rotates for one circle, so that 16 times of frequency multiplication is realized;

the rotation of the first permanent magnet (5) generates a small uniform sine wave in the power generation coil (31), the movement of the second permanent magnet (6) along with the movable plate (23) generates a large spike wave in the power generation coil (31), and the power generation coil cuts a magnetic induction line in the relative movement to generate induced electromotive force.

10. The composite nano generator for collecting low-frequency water wave energy according to claim 7, wherein in a certain stable state, the four electrodes and the fixed electrode which are contacted are divided into a group of generating units, the other four electrodes and the fixed electrode which are separated are divided into a group of generating units, the two groups of generating units have a certain phase difference, leads are respectively led out on the fixed electrode and the contact-separation electrode, and the two led-out leads are connected, so that a generating loop is formed.

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