Composite quarter-wavelength resonator acoustic wave rubbing nanogenerator

Abstract

The application discloses a composite quarter-wave resonator acoustic wave friction nanogenerator, which comprises a quarter-wave resonator tube, a conical concentrator and an acoustic wave friction nanogenerator; the conical concentrator is fixed at the front end of the quarter-wave resonator tube, and the acoustic wave friction nanogenerator is fixed at the tail end of the quarter-wave resonator tube. The application utilizes the composite structure to collect acoustic wave energy by using the acoustic wave friction nanogenerator as a power generation unit, and has the effect of collecting acoustic energy in a wide frequency band and high efficiency in a low frequency range of 20Hz-250Hz. Meanwhile, the output voltage reaches 348V, the short-circuit current reaches 77.3muA, and the transferred charge reaches 188nC when the sound pressure level is 95dB and the frequency is 90Hz. When the output impedance of the composite acoustic wave friction nanogenerator is matched, the output power can reach 13.5mW. Therefore, the application has better output performance in the capturing and enhancing effect of acoustic energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of acoustic-electric conversion, in particular to a composite quarter wavelength resonator acoustic wave rubbing nanogenerator. BACKGROUND

[0002] Acoustic waves are ubiquitous in life, and in industrial environments, many noises are produced along with production operations, which not only affect human hearing, but also are not conducive to production and manufacturing. According to the World Health Organization (WHO), 360 million people worldwide suffer from disabling hearing loss, which is more than 5% of the world's population. Therefore, it is particularly important to collect and utilize the noise in the environment.

[0003] In the existing acoustic energy collection methods, most of them are divided into electromagnetic, piezoelectric and electrostatic types, which can collect acoustic waves and convert them into electric energy to power electronic devices, but the power generation efficiency is generally low, and the acoustic energy cannot be efficiently concentrated, collected and utilized. For piezoelectric devices, high piezoelectric coefficient ceramics are usually used, which are usually suitable for higher frequency acoustic energy collection, but their relatively large Young's modulus will lead to mismatch of acoustic impedance and airflow. In addition, solid ceramic materials will reflect most of the incident acoustic energy and reduce the output performance. As for the electromagnetic method, it usually needs bulky components such as coils and magnets, which is not conducive to the light weight and small size of the energy collector, and the acoustic wave density is small, and it is difficult to cut the magnetic induction line. The triboelectric nanogenerator (TENG) can convert different forms of mechanical energy into electrical energy, and has the characteristics of low cost and simple production, and has significant advantages in micro-nano power generation, self-driven sensing and device performance control.

[0004] The main problem of the existing acoustic wave rubbing nanogenerator using quarter wavelength resonator is that the acoustic energy generation efficiency is not high enough. When the output impedance is matched, the maximum power of the acoustic wave rubbing nanogenerator is only 4.33mW, and the maximum power density per unit acoustic pressure is 0.43WPa -1 m -2 , which needs to be further improved. SUMMARY

[0005] In order to solve the above problems existing in the prior art, the present application designs a composite quarter wavelength resonator acoustic wave rubbing nanogenerator which can improve the power generation efficiency.

[0006] In order to achieve the above purpose, the technical scheme of the present application is as follows: a composite quarter wavelength resonator acoustic wave rubbing nanogenerator, comprising a quarter resonator tube, a conical energy concentrator and an acoustic wave rubbing nanogenerator.

[0007] The conical concentrator is fixed at the front end of the quarter wavelength resonant tube, and the acoustic wave friction nanogenerator is fixed at the tail end of the quarter wavelength resonant tube.

[0008] The acoustic wave friction nanogenerator comprises an aluminum film, an electrode, an FEP film and a fixed circular ring; the FEP film is a fluorinated ethylene propylene copolymer film; the aluminum film is pasted on the opening periphery of the quarter wavelength resonant tube, and a plurality of acoustic holes are arranged on the aluminum film; the FEP film is covered on the aluminum film, and the periphery of the FEP film is pasted and fixed with the periphery of the aluminum film; the fixed circular ring is fixed at the periphery of the end of the quarter wavelength resonant tube and is used for fixing the aluminum film and the FEP film; and the electrode is a conductive carbon nanotube printed electrode and is printed on the upper surface of the FEP film.

[0009] Further, the inlet end diameter of the conical concentrator is 2-3 times of the outlet end diameter; the outlet end diameter of the conical concentrator is the same as the diameter of the quarter wavelength resonant tube; the length of the conical concentrator is 1 / 10-1 / 12 of the length of the quarter wavelength resonant tube; and the conical angle θ of the conical concentrator is in the range of 5°<θ<45°.

[0010] Further, the inner cavity of the quarter wavelength resonant tube constitutes a quarter wavelength resonant cavity, and the conical concentrator and the quarter wavelength resonant tube are both 3D printed devices.

[0011] Further, the outlet end surface of the conical concentrator is the same in shape and size as the end surface of the quarter wavelength resonant tube.

[0012] Further, the conical concentrator and the quarter wavelength resonant tube are fixed by hot melt adhesive.

[0013] Further, the acoustic wave friction nanogenerator is fixed at the tail end of the quarter wavelength resonant tube by a circular ring clamping groove, and the circular ring clamping groove is a 3D printed device.

[0014] Further, the aluminum film surface is uniformly distributed with circular through holes with a diameter of 1mm and a vertical and horizontal spacing of 1mm.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. The present application uses a composite structure to collect acoustic energy by using an acoustic wave friction nanogenerator as a power generation unit, which has the effect of realizing wideband and efficient collection of low-frequency acoustic energy within 20Hz-250Hz. At the same time, the structure has good performance output results, and can output a voltage of 348V, a short-circuit current of 77.3μA and a transferred charge of 197nC at a sound pressure level of 100dB and a frequency of 90Hz.

[0017] 2、The composite acoustic wave friction nanogenerator of the application can reach 13.5 mW of output power when the optimal output impedance is matched, and the power density per unit sound pressure can reach 2.27 WPa at most when the sound pressure level is 100 dB -1 m -2 Therefore, compared with the traditional sound-electricity conversion device, the application has better output performance in sound energy capture and enhancement effect.

[0018] 3、The application has simple structure, easy manufacturing, low total cost of device, and great application potential in wireless sensor network sensing and energy supply in fault detection and voiceprint recognition. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic overall structure diagram of the composite quarter-wavelength resonator acoustic wave friction nanogenerator.

[0020] Figure 2 is a schematic exploded structure diagram of the composite quarter-wavelength resonator acoustic wave friction nanogenerator.

[0021] Figure 3 is a structure schematic diagram of the conical energy concentrator.

[0022] Figure 4 is an absolute value of amplified sound pressure level difference and voltage output diagram of the composite quarter-wavelength resonator acoustic wave friction nanogenerator in the frequency range of 30-220 Hz at 80 dB.

[0023] Figure 5 is a comparison diagram of open-circuit voltage output performance of the quarter-wavelength acoustic wave friction nanogenerator with and without the conical energy concentrator.

[0024] Figure 6 is a comparison diagram of short-circuit current of the quarter-wavelength acoustic wave friction nanogenerator with and without the conical energy concentrator.

[0025] Figure 7 is a comparison diagram of transferred charge amount of the quarter-wavelength acoustic wave friction nanogenerator with and without the conical energy concentrator.

[0026] Figure 8 is a comparison diagram of output voltage by changing the diameter of the opening end of the conical energy concentrator.

[0027] Figure 9 is a comparison diagram of output voltage by changing the length of the conical energy concentrator.

[0028] Figure 10 is an experimental diagram of output power and short-circuit current of the composite quarter-wavelength acoustic wave friction nanogenerator.

[0029] Figure 11 This is a schematic diagram of a composite quarter-wavelength acoustic triboelectric nanogenerator charging capacitors of different capacities.

[0030] In the diagram: 1. Conical energy concentrator, 2. Quarter-wavelength resonant tube, 3. Aluminum film, 4. FEP film, 5. Fixed ring. Detailed Implementation

[0031] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0032] like Figures 1-3 As shown, a composite quarter-wavelength resonator acoustic triboelectric nanogenerator includes a quarter-wavelength resonator tube, a conical energy concentrator 1, and an acoustic triboelectric nanogenerator.

[0033] The conical energy concentrator 1 is fixed at the front end of the quarter-wavelength resonant tube 2, and the acoustic triboelectric nanogenerator is fixed at the end of the quarter-wavelength resonant tube 2.

[0034] The acoustic triboelectric nanogenerator includes an aluminum film 3, electrodes, an FEP film 4, and a fixing ring 5; the FEP film 4 is a fluorinated ethylene propylene copolymer film; the aluminum film 3 is adhered to the periphery of the opening of the quarter-wavelength resonant tube 2, and multiple acoustic holes are provided on the aluminum film 3; the FEP film 4 covers the aluminum film 3, and the periphery of the FEP film 4 is adhered and fixed to the periphery of the aluminum film 3; the fixing ring 5 is fixed to the periphery of the end of the quarter-wavelength resonant tube 2 for fixing the aluminum film 3 and the FEP film 4; the electrodes are conductive carbon nanotube printed electrodes, printed on the upper surface of the FEP film 4.

[0035] Furthermore, the inlet diameter of the conical energy concentrator 1 is 2-3 times the outlet diameter; the outlet diameter of the conical energy concentrator 1 is the same as the diameter of the quarter-wavelength resonant tube 2; the length of the conical energy concentrator 1 is 1 / 10-1 / 12 of the length of the quarter-wavelength resonant tube 2; and the cone angle θ of the conical energy concentrator 1 ranges from 5° to θ to 45°.

[0036] Furthermore, the inner cavity of the quarter-wavelength resonant tube 2 constitutes a quarter-wavelength resonant cavity, and both the conical energy concentrator 1 and the quarter-wavelength resonant tube 2 are 3D printed devices.

[0037] Furthermore, the outlet end surface of the conical energy concentrator 1 has the same shape and size as the end face of the quarter-wavelength resonant tube 2.

[0038] Furthermore, the conical energy concentrator 1 and the quarter-wavelength resonant tube 2 are fixed with hot melt adhesive.

[0039] Furthermore, the acoustic triboelectric nanogenerator is fixed to the end of the quarter-wavelength resonant tube 2 by a circular ring slot, which is a 3D printed device.

[0040] Further, the surface of the aluminum film 3 is uniformly distributed with circular through holes with a diameter of 1 mm and a longitudinal and lateral spacing of 1 mm.

[0041] The working principle of the present application is as follows:

[0042] The sound wave enters from the opening end of the conical concentrator 1, and the incident sound wave propagates in the conical concentrator 1. Since the conical concentrator 1 is tapered, as the sound wave propagates, the amplitude of the sound wave at the outlet end of the conical concentrator 1 increases, and then the sound wave enters the quarter-wave resonant cavity for further propagation. In the resonant cavity, a standing wave with nodes and antinodes is generated. When the amplified sound wave vibrates in the resonant cavity, the sound wave continuously contacts and separates between the perforated aluminum film 3 and the FEP film 4 of the nanogenerator due to the excitation of the sound wave, thereby realizing sound-electricity conversion.

[0043] The sound wave friction nanogenerator, as a power generation unit, is composed of a FEP film 4, conductive carbon nanotubes, and an aluminum film 3, and is fixed at the outlet end of the quarter-wave resonant tube 2 by a circular ring. The FEP film 4 has conductive ink carbon nanotubes printed on its upper surface as an electrode, the conductive carbon nanotubes have good conductivity, and the aluminum film 3 serves as an aluminum electrode. When the sound wave friction nanogenerator is working, the FEP film 4 and the aluminum film 3 are initially in a separated state, and the electrons in the aluminum are free electrons. The FEP film 4 is forced to vibrate under the driving of the gradually increasing sound pressure in the quarter-wave resonator. When the FEP film 4 contacts the aluminum film 3, equal and opposite static charges are generated on the inner surfaces of the FEP film 4 and the aluminum film 3. With the change of the tension and sound pressure of the FEP film 4, the FEP film 4 tends to move away from the aluminum film 3, and the interface contact and separation of the positive and negative charges result in a potential difference between the two electrodes. This potential difference can drive the free electrons on the conductive carbon nanotube electrode to flow to the aluminum electrode. In this process, the potential of the friction nanogenerator tends to balance, and a positive charge is generated. The contact and separation behavior between the aluminum film 3 and the FEP film 4 further generates a potential difference between the surfaces of the two films, and an alternating current is generated by electrostatic induction, converting the mechanical strain energy transmitted into electrical energy, realizing mechanical-electrical energy conversion.

[0044] The embodiments of the present application are as follows:

[0045] In this embodiment, as shown in Figures 1-2 , it is a three-dimensional structure schematic diagram of the sound wave friction nanogenerator of the composite sound wave quarter-wave resonator. This composite sound wave friction nanogenerator mainly consists of two parts, one part is a conical concentrator 1 with an amplification sound amplitude effect. Figure 3 As shown in the conical tube,

[0046]

[0047] A(x) = 1 / (r(x)) = 1 / ([lr(l)-x(r(l)-r(0))]) (2)

[0048] Where r(x) is the taper of the tapered tube, which varies with the length x of the tapered tube, r(0) is the diameter of the inlet end of the tapered tube, r(l) is the diameter of the outlet end of the tapered tube, A(x) is the numerical simulation of the amplitude of the sound wave in the ideal state without reflected wave, i.e. the solution of the ordinary differential equation of the sound wave equation, which can be obtained by integration A(x) = 1 / (r(x)), and it can be further known that as long as the change rule of the radius r of the cross section of the tapered tube with x is known, A(x) can be obtained, and thus the solution of the equation is obtained.

[0049] For the tapered cavity, as the length x of the tapered tube increases, the taper r(x) decreases, and according to the above formula, A(x) gradually increases as the taper r(x) decreases, i.e. the amplitude increases. As known from the literature, the sound pressure of the sound wave is proportional to the square of the sound frequency and the amplitude, so the amplitude increases, the sound pressure and the sound intensity in the resonant cavity increase, thereby having the ability to converge sound energy and strengthen sound vibration, thereby improving the output of the sound wave friction nanometer generator. Further, within a certain θ range, if the diameter r(0) of the opening end of the tapered energy concentrator increases, it is beneficial to the output of the sound wave friction nanometer generator, because a larger inlet diameter of the tapered concentrator can reduce the reflection of the sound wave at the inlet, thereby reducing the energy loss. In addition, a larger inlet diameter can also reduce the energy dissipation of the sound wave during propagation, thereby helping to maintain a higher sound pressure amplification effect. In the present application, the diameter of the opening end of the conical energy concentrator 1 is 24.2 cm, the diameter of the outlet end is 9.5 cm, and the height is 7 cm.

[0050] The second part of the present application mainly consists of a sound wave friction nanometer generator of a quarter wavelength resonant tube 2. The quarter wavelength resonant cavity is composed of a quarter wavelength resonant tube 2 with one end open and the other end closed, as shown in Figure 2 The exploded view of the quarter wavelength resonant tube 2. The simplest standing wave in the quarter wavelength resonant cavity also corresponds to the longest standing wave, which covers a distance of 90 degrees of the sine wave from the maximum displacement amplitude (antinode) of the opening end to the zero displacement amplitude (node) of the other closed end, corresponding to one quarter of the wavelength of the sine wave, and there is basically no damping at the resonant frequency. Among them, the resonant fundamental frequency of the quarter wavelength resonant cavity is:

[0051]

[0052] Among them, the sound speed c is usually 340 m / s, and the resonant frequency depends on the length L of the quarter wavelength resonant tube 2.

[0053] When the incident sound wave passes through the cone-shaped energy concentrator 1 and the amplitude is preliminarily amplified, the sound wave enters the quarter wavelength resonant tube 2, and in the resonant cavity of the quarter wavelength resonant tube 2, the air in the first third of the cavity length at the open end acts as a mass, and the air in the subsequent two-thirds of the cavity length acts as a spring. Due to the reciprocating movement of the sound wave in the cavity, the outlet end of the friction nanometer generator is constantly in contact and separation, thereby converting sound energy into electrical energy. The diameter of the quarter wavelength resonant tube 2 in the application is 9.5 cm, and the length is 60 cm. The friction nanometer generator mainly consists of an aluminum film 3 with uniform aperture and a FEP film 4 brushed with conductive carbon nanotubes. The conductive carbon nanotubes are prepared by mixing multi-walled carbon nanotubes, resin and water in a ratio of 9:1:5, and screen printing on one side of a 50 μm thick FEP film 4. At the same time, the FEP film 4 still maintains good flexibility. The other side of the FEP film 4 is polished with 10000 mesh sandpaper, and the electronegativity is further enhanced after polishing. The effective area of the square is 55mm*55mm. Aluminum has good electrical conductivity and low cost, and has the advantage of being able to be used as an electrode. The aluminum film 3 in the power generation unit of the application serves as another electrode, and the effective working area is a square of 55mm*55mm, and the thickness is 1mm. The aluminum film 3 is distributed with small round holes of uniform density, which is conducive to balancing the contact area and airflow, so that the sound wave friction nanometer generator can achieve better contact and separation.

[0054] Figure 4 The figure shows that under the acoustic conditions of sound pressure level of 81.6dB, the frequency in the frequency domain range of 30-220Hz, the resonant frequency and sound pressure difference of the application are measured. It can be seen that in this frequency band, two resonance peaks appear in the cavity of the composite quarter wavelength sound wave friction nanometer generator, that is, the natural frequency is about 70Hz and 130Hz. When the sound wave friction nanometer generator reaches the first resonance state, the output voltage of the application is 144V, and when it reaches the second resonance frequency, the output voltage is only 117.7V. It can be seen that the output of the sound wave friction nanometer generator at the first resonance is higher than that at the second resonance frequency, that is, the composite sound wave friction nanometer generator obtains a larger amplification factor at the first mode, and attenuates at a higher mode. Obviously, the composite sound wave friction nanometer generator significantly widens the working frequency band of the resonator when working at low frequency, which is conducive to the collection of wide-band noise.

[0055] Figure 5The output voltage comparison test under the presence or absence of the tapered concentrator 1 is shown. As can be seen from the figure, when the sound pressure level is 95 dB and the frequency is 90 Hz, the output voltage of the quarter wavelength sound wave friction nanogenerator without the tapered concentrator 1 is 242 V, and the output voltage of the quarter wavelength sound wave friction nanogenerator with the tapered concentrator 1 is 348 V under the same excitation condition. Compared with the open circuit voltage output of the quarter wavelength sound wave friction nanogenerator without the tapered concentrator 1, the output voltage of the quarter wavelength sound wave friction nanogenerator with the tapered concentrator 1 is increased by about 43%. This is because the sound wave friction nanogenerator with the tapered concentrator 1 has a strong sound energy convergence effect. When the sound wave frequency is fixed, the displacement and deformation of the FEP film will be larger with the increase of the sound pressure and sound intensity, and therefore, a higher output performance can be obtained.

[0056] Figure 6 The output performance comparison test under the presence or absence of the tapered concentrator 1 is shown. As can be seen from the figure, when the sound pressure level is 95 dB and the frequency is 90 Hz, the short circuit current of the quarter wavelength sound wave friction nanogenerator without the tapered concentrator 1 is 58.1 μA, and the short circuit current of the quarter wavelength sound wave friction nanogenerator with the tapered concentrator 1 is 77.3 μA under the same excitation condition. Compared with the short circuit current of the quarter wavelength sound wave friction nanogenerator without the tapered concentrator 1, the short circuit current of the quarter wavelength sound wave friction nanogenerator with the tapered concentrator 1 is increased by 33%. At the same time, it is verified that the increase of the sound wave amplitude has the ability to further strengthen the sound vibration, thereby improving the output of the sound wave friction nanogenerator.

[0057] Figure 7 The output performance comparison test under the presence or absence of the tapered concentrator 1 is shown. As can be seen from the figure, when the sound pressure level is 95 dB and the frequency is 90 Hz, the transferred charge of the quarter wavelength sound wave friction nanogenerator without the tapered concentrator 1 is 135 nC, and the transferred charge of the quarter wavelength sound wave friction nanogenerator with the tapered concentrator 1 is 188 nC under the same excitation condition. Compared with the transferred charge of the quarter wavelength sound wave friction nanogenerator without the tapered concentrator 1, the transferred charge of the quarter wavelength sound wave friction nanogenerator with the tapered concentrator 1 is increased by 38%. It further shows that the quarter wavelength sound wave friction nanogenerator with the tapered concentrator 1 has the ability to efficiently convert sound energy.

[0058] Figure 8The influence of different structural parameters of the cone concentrator 1 on the collection of acoustic energy is shown in the case of the acoustic wave friction nanogenerator with the cone concentrator 1. The influence of three different lengths of the cone concentrator on the quarter wavelength acoustic wave friction nanogenerator is tested. The lengths of the cone concentrator 1 are 5 cm, 6 cm and 7 cm, and the open circuit voltages of the composite quarter wavelength acoustic wave friction nanogenerator are 294 V, 325 V and 347 V respectively. The experimental results show that the longer the length of the cone concentrator 1, the better the acoustic wave concentration effect.

[0059] Figure 9 The influence of different structural parameters of the cone concentrator 1 on the collection of acoustic energy is shown in the case of the acoustic wave friction nanogenerator with the cone concentrator 1. The influence of three different lengths of the cone concentrator 1 on the quarter wavelength acoustic wave friction nanogenerator is tested. The lengths of the cone concentrator 1 are 5 cm, 6 cm and 7 cm, and the open circuit voltages of the composite quarter wavelength acoustic wave friction nanogenerator are 294 V, 325 V and 347 V respectively. The experimental results show that the longer the length of the cone concentrator 1, the better the acoustic wave concentration effect.

[0060] Figure 10 The power experiment of the acoustic wave friction nanogenerator of the composite quarter wavelength resonator is shown. The internal resistance is 3 MΩ, the maximum output power is about 13.5 mW when the sound pressure level is 100 dB and the frequency is 90 Hz, and the acoustic wave friction nanogenerator has high energy conversion efficiency and can continuously power small power sensors.

[0061] Figure 11 The schematic diagram of charging different capacity capacitors for the acoustic wave friction nanogenerator of the composite quarter wavelength resonator is shown. When the sound pressure level is 100 dB and the excitation frequency is 110 Hz, the experimental results show that it takes only 5.6 s to charge a 47 mu F capacitor to 2.5 V, it takes 40 s to charge a 470 mu F capacitor to 2.5 V, and it takes only 108 s to charge a 1k mu F capacitor to 2.5 V. It can be seen that the acoustic wave friction nanogenerator not only has a simple structure and low cost, but also can vibrate smoothly and generate electricity in the low frequency acoustic wave band, so it is more suitable for efficient acoustic energy collection and is conducive to the further utilization of environmental resources.

[0062] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can make equivalent replacements or changes to the technical solution and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A composite quarter-wavelength resonator acoustic wave frictional nanogenerator, characterized in that: It comprises a quarter resonant tube, a conical concentrator (1) and a sound wave friction nanogenerator; The conical concentrator (1) is fixed at the front end of the quarter wavelength resonant tube (2), and the sound wave friction nanogenerator is fixed at the end of the quarter wavelength resonant tube (2). The sound wave friction nanogenerator comprises an aluminum film (3), an electrode, an FEP film (4) and a fixed ring (5); the FEP film (4) is a fluorinated ethylene propylene copolymer film; the aluminum film (3) is pasted on the opening periphery of the quarter wavelength resonant tube (2), and a plurality of sound holes are arranged on the aluminum film (3); the FEP film (4) is covered on the aluminum film (3), and the periphery of the FEP film (4) is pasted and fixed with the periphery of the aluminum film (3); the fixed ring (5) is fixed on the periphery of the end of the quarter wavelength resonant tube (2) and is used for fixing the aluminum film (3) and the FEP film (4); the electrode is a conductive carbon nanotube printed electrode printed on the upper surface of the FEP film (4); The inlet end diameter of the conical concentrator (1) is 2-3 times of the outlet end diameter; the outlet end diameter of the conical concentrator (1) is the same as the diameter of the quarter wavelength resonant tube (2); the length of the conical concentrator (1) is 1 / 10-1 / 12 of the length of the quarter wavelength resonant tube (2); the value range of the taper angle θ of the conical concentrator (1) is 5°<θ<45°.

2. The composite quarter-wavelength resonator type acoustic rubbing nanogenerator according to claim 1, wherein: The inner cavity of the quarter wavelength resonant tube (2) constitutes a quarter wavelength resonant cavity, and the conical concentrator (1) and the quarter wavelength resonant tube (2) are both 3D printed devices.

3. The composite quarter-wavelength resonator type acoustic rubbing nanogenerator according to claim 1, wherein: The outlet end surface of the conical concentrator (1) is the same in shape and size as the end surface of the quarter wavelength resonant tube (2).

4. The composite quarter-wavelength resonator type acoustic rubbing nanogenerator according to claim 1, wherein: The conical concentrator (1) and the quarter wavelength resonant tube (2) are fixed by hot melt adhesive.

5. The composite quarter-wavelength resonator type acoustic rubbing nanogenerator according to claim 1, wherein: The sound wave friction nanogenerator is fixed at the end of the quarter wavelength resonant tube (2) by a circular ring clamping groove, and the circular ring clamping groove is a 3D printed device.

6. The composite quarter-wavelength resonator type acoustic rubbing nanogenerator according to claim 1, wherein: The aluminum film (3) surface is uniformly distributed with circular through holes with a diameter of 1mm and a vertical and horizontal spacing of 1mm; The anchor point of the ship, the horizontal coordinate is , and the vertical coordinate is .

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