Acoustic-electric conversion device, absorption device, sound absorption conversion apparatus, and server

Abstract

The application discloses an acoustic-electric conversion device, a sound absorption device, a sound absorption conversion equipment and a server, relates to the technical field of acoustic noise reduction and energy recovery, and comprises at least two stages of resonators and an acoustic-electric conversion assembly arranged in the resonator of the last stage; and the resonance of sound waves in the chamber of the resonator of the last stage drives the acoustic-electric conversion assembly to generate electric current. The at least two stages of resonators can be arranged to have different natural frequencies, so as to cover a wider frequency range of sound waves and realize the absorption of sound with a wider frequency. In addition, the arrangement of the acoustic-electric conversion assembly can convert acoustic energy into electric energy, realize the effective utilization of acoustic energy, solve the technical problems that the noise reduction effect of a server running cooling fan is not ideal and noise resources cannot be effectively utilized, and achieve the technical effects of covering the noise frequency of the cooling fan, effectively reducing noise and converting acoustic energy into electric energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of acoustic noise reduction and energy recovery, and in particular to an acoustic-electric conversion device, an absorption device, a sound absorption conversion equipment and a server. BACKGROUND

[0002] When the server is running, the noise generated by the cooling fan has become an environmental pollution source that cannot be ignored. The fan noise of a typical 1U server under full load working condition can reach 45-75dB, and its frequency spectrum presents a significant broadband characteristic: the low frequency band (200-500Hz) is mainly caused by fan motor vibration and blade periodic beating air, and the high frequency band (1-4kHz) is caused by air flow turbulence and air duct resonance. Such noise not only causes the risk of hearing loss of personnel, but also reduces work efficiency.

[0003] In order to solve the noise problem in the working process of the server, passive sound absorption materials are generally used to absorb noise, active noise reduction systems are used to reduce noise, and air duct aerodynamic optimization is used, but in the actual implementation process, the absorption coefficient of the porous sound absorption material to the low frequency sound wave (<500Hz) is less than 0.3, resulting in an actual noise reduction effect of less than 5dB; active noise reduction relies on interference of reverse sound waves, requires additional power supply and can only suppress narrow frequency stable noise, and cannot handle broadband random turbulence sound; air duct optimization reduces noise by reducing air flow speed, but is limited by the compact space of the server, and the noise reduction amplitude is usually less than 3dB. SUMMARY

[0004] The present application provides an acoustic-electric conversion device, at least two stages of resonators can be set to different natural frequencies in order to cover a wider range of sound wave frequencies, and to achieve absorption of sound waves of a wider frequency. In addition, the setting of the acoustic-electric conversion assembly can convert acoustic energy into electric energy, achieving effective utilization of acoustic energy, so as to at least solve the problem in the related art that wide frequency noise reduction cannot be handled and acoustic energy cannot be effectively utilized.

[0005] The present application provides an acoustic-electric conversion device, comprising:

[0006] at least two stages of resonators and an acoustic-electric conversion assembly arranged at the last stage of resonators;

[0007] Each stage of resonators comprises a neck and a cavity in communication with the neck, and the cavity side wall of the upper stage resonator in the adjacent two stages of resonators is provided with a neck in communication with the cavity of the lower stage resonator; the cavity of the upper stage resonator falls within the projection of the cavity of the lower stage resonator along the vertical direction of the side wall.

[0008] In one aspect, the resonator comprises a first stage resonator and at least two second stage resonators, and the at least two second stage resonators are arranged outside the circumference of the first stage resonator.

[0009] In another aspect, the first-stage resonator comprises a prismatic main cavity, and the main cavity is provided with a main cavity neck at one axial end for the sound wave to enter;

[0010] Any side wall of the main cavity is provided with a second-stage resonator, and the second-stage resonator comprises a secondary cavity and a secondary cavity neck provided at the corresponding side wall of the main cavity;

[0011] The sound wave resonated in the main cavity enters the secondary cavity through the secondary cavity neck and resonates in the secondary cavity.

[0012] In another aspect, the sound-electricity conversion device is a cuboid or a square structure, and the main cavity is a cuboid;

[0013] The number of the second-stage resonators is four, and the four second-stage resonators are provided one by one at the four side walls of the main cavity; and the cross section of the secondary cavity is trapezoidal.

[0014] In another aspect, the cross section of the main cavity neck is circular, and the cross section of the secondary cavity neck is square.

[0015] In another aspect, at least one side wall of the secondary cavity is provided with the sound-electricity conversion assembly, and the sound-electricity conversion assembly is provided at the inner side wall of the secondary cavity.

[0016] The sound-electricity conversion assembly is in the form of a sheet and is attached to the inner side wall of the secondary cavity.

[0017] In another aspect, the inner side wall of the secondary cavity opposite to the secondary cavity neck is provided with the sound-electricity conversion assembly.

[0018] In another aspect, the inner side wall of the cavity of at least one of the resonators other than the last-stage resonator is provided with a plurality of arrayed convex structures, and the convex structures are used for guiding the sound wave to the neck of the next-stage resonator and improving the resonance effect of the cavity where the convex structures are located, so as to amplify the sound pressure.

[0019] In another aspect, the convex structure is a cylindrical convex structure, and the cylindrical convex structure is an elastic structure; and the convex structures are arranged in a rectangular array on the inner side wall of the cavity.

[0020] In another aspect, the cavity side wall where the convex structure is located is provided with a neck for the sound wave to enter the cavity of the next-stage resonator, and the neck is located at the center of the inner side wall of the cavity where the neck is located.

[0021] In another aspect, the acoustic-electric conversion assembly comprises a first friction layer, a second friction layer and a third friction layer, the first friction layer is arranged in close contact with the inner side wall of the chamber where the acoustic-electric conversion assembly is located, the second friction layer is arranged between the first friction layer and the third friction layer;

[0022] The first friction layer and the third friction layer are positive electrode material layers, and the second friction layer is a negative electrode material layer, and the acoustic wave vibration drives the first friction layer and the second friction layer to periodically contact and separate to generate an electric current.

[0023] In another aspect, the positive electrode material layer is a copper foil material, and the negative electrode material layer is a polydimethylsiloxane material.

[0024] In another aspect, the acoustic-electric conversion assembly is provided with a protruding mass on the side away from the side wall of the chamber where the acoustic-electric conversion assembly is located, and the mass is located at the center of the surface of the acoustic-electric conversion assembly.

[0025] In another aspect, it further comprises a current conversion circuit connected with the acoustic-electric conversion assembly for converting alternating current output by the acoustic-electric conversion assembly into direct current.

[0026] In another aspect, the current conversion circuit comprises a rectifier connected with the acoustic-electric conversion assembly at the input end and connected with a load at the output end, and a resistor and a capacitor connected in parallel with the rectifier, and the resistor and the capacitor are connected in series in the same branch.

[0027] In another aspect, it further comprises a current monitoring circuit connected with the acoustic-electric conversion assembly and receiving the electric signal generated by the acoustic-electric conversion assembly, and the current monitoring circuit sends the received electric signal to the controller, and the controller judges the working state of the sound generating device according to the electric signal.

[0028] The application also provides a sound absorbing device comprising at least two stages of resonators;

[0029] Each stage of the resonator comprises a neck and a chamber in communication with the neck; and the side wall of the chamber of the upper stage of the resonator of the adjacent two stages is provided with a neck for communication with the chamber of the lower stage of the resonator;

[0030] The chamber of the upper stage of the resonator falls within the vertical projection of the chamber of the lower stage of the resonator along the direction perpendicular to the side wall.

[0031] The application also provides a sound absorbing conversion device comprising a plurality of the acoustic-electric conversion devices and a shell, or the sound absorbing conversion device comprises a plurality of the sound absorbing devices and a shell;

[0032] The shell is used for mounting the acoustic-electric conversion device or the sound absorption device, and the shell is used for connecting with a sound generating device.

[0033] In one aspect, the shell is a cylindrical shell, the acoustic-electric conversion device is arranged on the inner side wall of the cylindrical shell, and the necks of the first-stage resonators in the acoustic-electric conversion device all face away from the side of the inner side wall of the cylindrical shell where the acoustic-electric conversion device is located.

[0034] In another aspect, the outer wall edge of one end of the cylindrical shell in the axial direction is provided with a connecting flange, the connecting flange has an extension in the radial direction of the cylindrical shell, and the connecting flange is used for connecting with a sound generating device.

[0035] In another aspect, the shell is a plate-shaped shell, the acoustic-electric conversion device is arranged on the inner side wall of the plate-shaped shell, and the necks of the first-stage resonators in the acoustic-electric conversion device all face the side of the plate-shaped shell.

[0036] The application also provides a server comprising the sound absorption conversion device of any one of the above and a sound generating device connected with the sound absorption conversion device.

[0037] According to the application, because at least two stages of resonators are arranged, in actual use, sound waves enter the cavities of the first-stage resonators through the necks of the first-stage resonators, sound pressure changes are generated at the necks of the first-stage resonators, and resonance is generated in the cavities of the first-stage resonators, the resonated sound waves enter the cavities of the next-stage resonators through the necks of the next-stage resonators, and finally enter the cavity of the last-stage resonator and generate resonance in the cavity of the last-stage resonator; in this process, the sound waves are resonated by the at least two stages of resonators, and the resonance of the sound waves in the cavity of the last-stage resonator drives the acoustic-electric conversion assembly to generate electric current, thereby realizing the absorption of sound waves and the conversion of sound energy into electric energy; and the application can be used for acoustic noise reduction and the recycling of sound energy.

[0038] In the application, the resonance of sound waves by the at least two stages of resonators can effectively amplify sound pressure and improve the utilization rate of sound energy; in addition, the at least two stages of resonators can be arranged to have different natural frequencies, so as to cover a wider range of sound wave frequencies and realize the absorption of sound of a wider frequency range. Furthermore, the arrangement of the acoustic-electric conversion assembly can convert sound energy into electric energy, thereby realizing the effective utilization of sound energy. Therefore, the technical problem that the noise reduction effect of a server running cooling fan is not ideal and noise resources cannot be effectively utilized can be solved, and the technical effects of covering the noise frequency of the cooling fan, effectively reducing noise, and converting sound energy into electric energy can be achieved.

[0039] In addition, the present application also provides a sound absorption device, a sound absorption conversion device including the above-mentioned sound-to-electric conversion device or the sound absorption device, and a server including the above-mentioned sound absorption conversion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] Figure 1 An exploded diagram of an acoustic-to-electrical conversion device provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the appearance of an acoustic-to-electrical conversion device provided in an embodiment of the present application;

[0043] Figure 3 This is a schematic structural diagram of a sound-to-electricity conversion device provided in an embodiment of the present application after the portion provided with the main cavity neck opening is separated from the main body portion;

[0044] Figure 4 A schematic diagram of the internal structure of an acoustic-to-electrical conversion device provided in an embodiment of the present application;

[0045] Figure 5 for Figure 4 A schematic cross-sectional view of the acoustic-to-electrical conversion device;

[0046] Figure 6 for Figure 5 A schematic front view of the acoustic-to-electrical conversion device;

[0047] Figure 7 for Figure 4 A schematic side view of the acoustic-to-electrical conversion device;

[0048] Figure 8 A schematic structural diagram of a sound absorption and conversion device provided in an embodiment of the present application;

[0049] Figure 9 for Figure 8 A schematic structural diagram of a cylindrical shell of a sound absorption and conversion device;

[0050] Figure 10 for Figure 8 Schematic diagram of the structure in which the sound absorption and conversion device is installed on the sound generating device;

[0051] Figure 11 for Figure 10 A schematic structural diagram of the sound generating device;

[0052] Figure 12 The working flow diagram of the acoustic-electric conversion assembly provided by the embodiment of the present application is shown in the figure.

[0053] Figure 13 The structural diagram of the current conversion circuit provided by the embodiment of the present application is shown in the figure.

[0054] Among them, the above-mentioned drawings include the following reference signs:

[0055] 01-acoustic-electric conversion device;

[0056] 1-first stage resonator, 11-main cavity neck, 12-main cavity, 13-convex structure;

[0057] 2-second stage resonator, 21-sub cavity neck, 22-sub cavity;

[0058] 3-acoustic-electric conversion assembly, 31-first friction layer, 32-second friction layer, 33-third friction layer, 34-mass;

[0059] 4-current conversion circuit, 41-rectifier, 42-load, 43-resistor, 44-capacitor;

[0060] 02-sound absorption conversion equipment;

[0061] 5-cylindrical shell, 51-connection flange, 52-mounting groove;

[0062] 03-sound generating device. DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0064] It should be noted that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. The terms "parallel", "perpendicular", "equal" include the described case and the approximate case similar to the described case, and the approximate case is within the acceptable deviation range, which is determined by the ordinary skilled person considering the measurement being discussed and the error related to the measurement of a particular quantity (i.e. the limitation of the measurement system). For example, "parallel" includes absolute parallel and approximate parallel, and the acceptable deviation range of approximate parallel can be, for example, within 5°; "perpendicular" includes absolute perpendicular and approximate perpendicular, and the acceptable deviation range of approximate perpendicular can also be, for example, within 5°. "Equal" includes absolute equality and approximate equality, and the acceptable deviation range of approximate equality can be, for example, that the difference between the two equalities is less than or equal to 5% of either. The specific meaning of the above terms in the present application can be understood in specific cases by the ordinary skilled person in the art.

[0065] In order for those skilled in the art to better understand the scheme of the present application, the present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0066] The embodiment of the present application provides an acoustic-electric conversion device 01, which comprises at least two stages of resonators and an acoustic-electric conversion component 3 arranged in the last stage of resonators; and the resonance of the sound wave in the chamber of the last stage of resonators drives the acoustic-electric conversion component 3 to generate an electric current; each stage of resonators comprises a neck and a chamber in communication with the neck, and the sound wave enters the chamber in communication with the neck from the neck and excites the chamber to produce resonance to amplify the sound pressure; the side wall of the chamber of the upper stage of resonators in the two adjacent stages of resonators is provided with a neck for communicating with the chamber of the lower stage of resonators; the orthogonal projection of the chamber of the upper stage of resonators along the direction perpendicular to any side wall falls within the orthogonal projection of the chamber of the lower stage of resonators along the direction perpendicular to the side wall.

[0067] It needs to be explained that the chamber of the upper-level resonator in the embodiment mentioned in the embodiment falls within the orthographic projection of the chamber of the lower-level resonator along the direction perpendicular to the side wall, specifically, the orthographic projection of the chamber of the upper-level resonator along the direction perpendicular to any side wall of the upper-level resonator falls within the orthographic projection of the chamber of the lower-level resonator along the direction perpendicular to the side wall; the chamber of the lower-level resonator is arranged outside the side wall of the chamber of the upper-level resonator, and the chamber of the lower-level resonator arranged on the corresponding side wall of the chamber of the upper-level resonator can completely cover the side wall of the chamber of the upper-level resonator, or the chamber of the lower-level resonator arranged on the corresponding side wall of the chamber of the upper-level resonator can partially cover the side wall of the chamber of the upper-level resonator; the extension direction of the chamber of the lower-level resonator from the side connected to the side wall of the chamber of the upper-level resonator to the outside can be along the direction perpendicular to the side wall of the chamber of the upper-level resonator, or the extension direction of the chamber of the lower-level resonator from the side connected to the side wall of the chamber of the upper-level resonator to the outside has an extension along the direction perpendicular to the side wall of the chamber of the upper-level resonator, which is specifically determined according to actual conditions and will not be described here.

[0068] It needs to be explained that the resonator in the embodiment can be a Helmholtz resonator, or other resonators that meet the requirements, which is specifically determined according to actual conditions; the acoustic-electric conversion assembly 3 in the embodiment can be a friction nanometer acoustic-electric conversion assembly, or other acoustic-electric conversion assemblies that meet the requirements, which is specifically determined according to actual conditions.

[0069] The number of each resonator in the at least two levels of resonators in the embodiment can be one or multiple, which is specifically determined according to actual conditions and will not be described here.

[0070] The arrangement mode of the at least two levels of resonators can be to arrange the resonator of the lower level around the outer periphery of the resonator of the upper level, or to arrange the resonator of the lower level on one side of the resonator of the upper level, which is specifically determined according to actual conditions and will not be described here.

[0071] In order to enable the at least two levels of resonators to cover a wider frequency of sound waves, and to have a noise reduction effect on noise of a low frequency band and a high frequency band, different resonators in the at least two levels of resonators can be arranged to be for different natural frequencies, of course, part of the resonators in the at least two levels of resonators can also be arranged to be for different natural frequencies, which is specifically determined according to actual conditions and will not be described here.

[0072] In the actual arrangement process, the number of levels of resonators or the number of resonators of the same level can be adjusted according to the frequency characteristics of the noise source that needs to be reduced, which is specifically determined according to actual conditions and will not be described here.

[0073] The sound wave enters the cavity of the first-stage resonator from the neck of the first-stage resonator, the sound wave produces a sound pressure change at the neck of the first-stage resonator, causing the air in the cavity of the first-stage resonator to start resonating, and when the frequency of the external incident sound wave is equal to the natural frequency of the resonator, the air column in the neck resonates violently. The sound wave enters the cavity of the next-stage resonator from the neck of the next-stage resonator, the sound wave produces a sound pressure change at the neck of the next-stage resonator, causing the air in the cavity of the next-stage resonator to start resonating, until the sound wave enters the cavity of the last-stage resonator, the sound wave produces a sound pressure change at the neck of the last-stage resonator, causing the air in the cavity of the last-stage resonator to start resonating, and the resonance of the air in the cavity of the last-stage resonator drives the sound-electricity conversion component 3 to generate an electric current.

[0074] In actual use, the sound wave enters the cavity of the first-stage resonator from the neck of the first-stage resonator 1, the sound wave produces a sound pressure change at the neck of the first-stage resonator, and resonates in the cavity of the first-stage resonator, the resonated sound wave enters the cavity of the next-stage resonator from the neck of the next-stage resonator, until the sound wave enters the cavity of the last-stage resonator and resonates in the cavity of the last-stage resonator; in this process, the sound wave resonates through at least two stages of resonators, and the resonance of the sound wave in the cavity of the last-stage resonator drives the sound-electricity conversion component 3 to generate an electric current, realizing the absorption of sound waves and the conversion of sound energy into electric energy; which can be used for acoustic noise reduction and sound energy recovery.

[0075] In the specific embodiment, the sound wave resonates through at least two stages of resonators, which can effectively amplify the sound pressure and improve the utilization rate of sound energy; in addition, the at least two stages of resonators can be set to different natural frequencies in order to cover a wider range of sound wave frequencies, realizing the absorption of sound of a wider frequency. In addition, the sound-electricity conversion component 3 is provided, which can convert sound energy into electric energy, realizing the effective utilization of sound energy. Therefore, the technical problems of the server running noise fan noise reduction effect is not ideal and noise resources cannot be effectively utilized can be solved, achieving the technical effects of covering the noise frequency of the noise fan, effectively reducing noise and converting sound energy into electric energy.

[0076] In a specific embodiment, the resonator comprises a first-stage resonator 1 and at least two second-stage resonators 2, and the at least two second-stage resonators 2 are arranged outside the circumference of the first-stage resonator 1.

[0077] In actual use, the sound wave enters the cavity of the first resonator 1 from the neck of the first resonator 1, and the sound wave produces a sound pressure change at the neck of the first resonator 1, causing the air in the cavity of the first resonator 1 to start resonating. When the frequency of the external incident sound wave is equal to the natural frequency of the first resonator 1, the air column in the neck vibrates violently due to resonance. The sound wave in the cavity of the first resonator 1 enters the cavity of the second resonator 2 from the neck of the second resonator 2, and the sound wave produces a sound pressure change at the neck of the second resonator 2, causing the air in the cavity of the second resonator 2 to start resonating. When the frequency of the external incident sound wave is equal to the natural frequency of the second resonator 2, the air column in the neck vibrates violently due to resonance.

[0078] In the embodiment, at least two second resonators 2 are provided, so that in actual use, the sound wave in the cavity of the first resonator 1 is guided to the necks of different second resonators 2, and the sound wave is amplified and resonated again by different second resonators 2. Two-stage resonance can be achieved for the sound wave, the sound pressure is effectively increased, and at least two second resonators 2 can be provided with different natural frequencies to cope with the absorption of sound waves with a wider frequency. In addition, at least two second resonators 2 are provided, and an acoustic-electric conversion assembly 3 can be provided in each second resonator 2, which can effectively increase the number of acoustic-electric conversion assemblies 3 and improve the conversion efficiency of sound energy.

[0079] On the basis of the above embodiment, the resonator can include a first resonator 1, at least two second resonators 2, and at least two third resonators, the at least two second resonators 2 are arranged outside the circumference of the first resonator 1, and the at least two third resonators are arranged outside the circumference of the second resonator 2.

[0080] In actual use, the sound wave enters the cavity of the first resonator 1 from the neck of the first resonator 1, the sound wave produces a sound pressure change at the neck of the first resonator 1, causing the air in the cavity of the first resonator 1 to start resonating, when the frequency of the external incident sound wave is equal to the natural frequency of the first resonator 1, the air column in the neck vibrates violently due to resonance. The sound wave in the cavity of the first resonator 1 enters the cavity of the second resonator 2 through the neck of the second resonator 2, the sound wave produces a sound pressure change at the neck of the second resonator 2, causing the air in the cavity of the second resonator 2 to start resonating, when the frequency of the external incident sound wave is equal to the natural frequency of the second resonator 2, the air column in the neck vibrates violently due to resonance. The sound wave in the cavity of the second resonator 2 enters the cavity of the third resonator through the neck of the third resonator, the sound wave produces a sound pressure change at the neck of the third resonator, causing the air in the cavity of the third resonator to start resonating, when the frequency of the external incident sound wave is equal to the natural frequency of the third resonator, the air column in the neck vibrates violently due to resonance.

[0081] In the specific embodiment, due to the provision of at least two second resonators 2 and at least two third resonators, in actual use, the sound wave in the cavity of the first resonator 1 is guided to the necks of different second resonators 2, and the sound wave is amplified again and resonated by different second resonators 2. The sound wave in the cavity of the second resonator 2 is guided to the necks of different third resonators, and the sound wave is amplified again and resonated by different third resonators. Three-stage resonance for sound waves can be achieved, the sound pressure is effectively increased, and at least two second resonators 2 and at least two third resonators can be provided with different natural frequencies to cope with the absorption of a wider frequency of sound. In addition, at least two third resonators are provided, and an acoustic-electric conversion assembly 3 can be provided in each third resonator, which can effectively increase the number of acoustic-electric conversion assemblies 3 and improve the conversion efficiency of acoustic energy.

[0082] Of course, the acoustic-electric conversion device in the present application can also include four-stage resonators or five-stage resonators or other stage resonators, which are determined according to actual conditions, and will not be described here.

[0083] In addition, in the present application, the acoustic-electric conversion assembly 3 can be provided only in the last-stage resonator to ensure the full and effective use of acoustic energy, and according to different actual conditions, the acoustic-electric conversion assembly 3 can also be provided in other-stage resonators, which is determined according to actual conditions.

[0084] On the basis of the above-mentioned embodiments, the first-stage resonator 1 can include a prismatic main cavity 12, the main cavity 12 is provided with a main cavity neck 11 for entering sound waves at one end in the axial direction; any side wall of the main cavity 12 is correspondingly provided with a second-stage resonator 2, the second-stage resonator 2 includes a secondary cavity 22 and a secondary cavity neck 21 provided on the side wall of the corresponding main cavity 12; the sound waves resonated in the main cavity 12 enter the secondary cavity 22 through the secondary cavity neck 21 and resonate in the secondary cavity 22.

[0085] It should be noted that the main cavity 12 in the specific embodiment can be a quadrangular prism structure, or a pentagonal prism or a hexagonal prism structure, etc., which is determined according to actual conditions; when the main cavity 12 is a quadrangular prism structure, four second-stage resonators 2 can be provided, and the four second-stage resonators 2 are one-to-one corresponding to the four sides of the quadrangular prism; when the main cavity 12 is a pentagonal prism structure, five second-stage resonators 2 can be provided, and the five second-stage resonators 2 are one-to-one corresponding to the four sides of the pentagonal prism.

[0086] In the specific embodiment, the main cavity 12 is set to be prismatic, and the prismatic main cavity 12 can flexibly change the cavity volume and geometric proportion by adjusting the side length, angle and height of the bottom polygon, so as to more accurately control the resonant frequency; in addition, the edges and flat wall structure of the polyhedral chamber can guide the sound waves to produce multiple reflections and interference in the cavity, enhance the sound energy dissipation efficiency, reduce the local energy accumulation formed by standing waves, and thus improve the sound absorption bandwidth and stability. The acoustic performance and engineering applicability of the resonator are significantly optimized, which is especially suitable for scenes with strict requirements on space, frequency adaptability and energy recovery efficiency.

[0087] Specifically, as shown in Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the overall structure of the acoustoelectric conversion device 01 can be set to a cuboid or a square structure, and the main cavity 12 is a cuboid; the number of the second-stage resonators 2 is four, and the four second-stage resonators 2 are one-to-one corresponding to the four side walls of the main cavity 12; the cross section of the secondary cavity 22 is trapezoidal.

[0088] As shown in Figure 2 , the overall structure of the acoustoelectric conversion device 01 is a cuboid or a cuboid structure, and in the actual installation process, since the acoustoelectric conversion device 01 is a regular cuboid or a cuboid, it is convenient to install the acoustoelectric conversion device 01, and a plurality of acoustoelectric conversion devices 01 can be arranged in order, so that the acoustoelectric conversion device 01 can effectively utilize the space in the installation process and avoid wasting space.

[0089] As shown in Figure 3 , the cross section of the main cavity neck 11 is circular, and the cross section of the secondary cavity neck 21 is trapezoidal.Figure 5 、 Figure 6 As shown in FIG. 1, the cross section of the neck 11 of the primary cavity 12 is circular.

[0090] In the embodiment, the cross section of the neck 11 of the primary cavity 12 is circular, which is suitable for the case that the cross section of the channel for transmitting sound waves is circular, and facilitates processing. The cross section of the neck 21 of the secondary cavity 22 is square, which corresponds to the shape of the side wall of the primary cavity 12, and facilitates processing.

[0091] In an embodiment, the primary cavity 12 of the first-stage resonator 1 can be cylindrical, the neck 11 of the primary cavity 12 is located at the end face of one end of the axial direction of the cylindrical primary cavity 12, the number of the second-stage resonators 2 is multiple, and the multiple second-stage resonators 2 are arranged around the outer periphery of the primary cavity 12, and the cross section of the secondary cavity 22 of the second-stage resonator 2 is fan-shaped, so that the overall structure of the sound-electricity conversion device 01 is cylindrical.

[0092] It should be noted that the sum of the fan-shaped angles of the cross sections of the secondary cavities 22 of the multiple second-stage resonators 2 can be 360° or close to 360°, so that the multiple second-stage resonators 2 are combined to form a closed cylindrical structure around the periphery of the first-stage resonator 1.

[0093] In the embodiment, the overall structure of the sound-electricity conversion device 01 is cylindrical, which facilitates the installation of the sound-electricity conversion device 01 in a cylindrical space, and meets the installation requirements of different spaces. In addition, the cylindrical structure has axial symmetry, which enables the sound waves to propagate along the axial direction. This directional propagation characteristic makes the cylindrical sound-electricity conversion device 01 particularly suitable for scenarios requiring directional acoustic output, such as in the fields of audio equipment, acoustic speakers, etc. Moreover, the manufacturing process of the cylindrical structure is relatively simple. Due to its axial symmetry, the cylindrical resonator can be efficiently manufactured through processes such as rotational molding and stretch molding, thereby reducing manufacturing costs.

[0094] In another embodiment, the primary cavity 12 of the first-stage resonator 1 can be spherical, the neck 11 of the primary cavity 12 is located at the side wall of the multi-faceted spherical primary cavity 12, the number of the second-stage resonators 2 is multiple, and the multiple second-stage resonators 2 are arranged around the outer periphery of the primary cavity 12, and the cross section of the secondary cavity 22 of the second-stage resonator 2 is fan-shaped, so that the overall structure of the sound-electricity conversion device 01 is a spherical shape with a notch, and the notch is provided with the neck 11 of the primary cavity 12.

[0095] In this embodiment, the acoustic-electric conversion device 01 is set as a spherical ball with a notch, which can be installed in a spherical space during actual use, adapting to the installation needs of different shaped spaces. The spherical structure has excellent stability in mechanics, and due to its surface curvature, the spherical structure can uniformly distribute stress and reduce local stress concentration. This uniform stress distribution can improve the mechanical strength and durability of the resonator, enabling it to withstand greater pressure and vibration. In addition, the spherical main cavity 12 has symmetry, which can make the sound waves uniformly distributed inside the main cavity 12. This uniformity can reduce the reflection and interference of sound waves in the main cavity 12, thereby improving the acoustic performance. Compared with traditional cylindrical or other shaped resonators, the spherical resonator can more effectively realize the resonance of sound waves and enhance the acoustic effect. In addition, the spherical structure of the main cavity 12 has a wider frequency response range, and due to its symmetry and uniform sound field distribution, the spherical resonator can better adapt to sound wave input of different frequencies, thereby realizing more extensive acoustic applications.

[0096] On the basis of the above embodiment, the acoustic-electric conversion assembly 3 can be arranged on at least one side wall of the secondary cavity 22, and the acoustic-electric conversion assembly 3 is arranged on the inner side wall of the secondary cavity 22. The acoustic-electric conversion assembly 3 is in a sheet shape and attached to the inner side wall of the secondary cavity 22.

[0097] Specifically, the acoustic-electric conversion assembly 3 covers at least part of the inner side wall of the secondary cavity 22.

[0098] In this embodiment, the acoustic-electric conversion assembly 3 can be arranged on all side walls of the secondary cavity 22, or the acoustic-electric conversion assembly 3 can be arranged on part of the side walls of the secondary cavity 22. The specific arrangement is determined according to the actual situation, which will not be described here.

[0099] In actual use, when the acoustic-electric conversion device 01 is in a working state, the air in the secondary cavity 22 of the second-stage resonator 2 vibrates under the action of sound waves, thereby driving the friction layer of the acoustic-electric conversion assembly 3 to move in a contact-separation manner. In the contact-separation process, the electric charge in the acoustic-electric conversion assembly 3 is transferred to form an electric current, thereby realizing the process of converting mechanical energy into electrical energy.

[0100] In this embodiment, the acoustoelectric conversion assembly 3 can convert the energy of the sound wave vibration in the secondary cavity 22 of the second-order resonator 2 into electrical energy, thereby providing power for some low-power electronic devices (such as sensors, wireless communication modules, etc.). This self-powered feature reduces the dependence on external power supply and reduces the operating cost of the system. In addition, this energy recovery method not only improves the overall energy utilization efficiency of the system, but also provides additional power support for other devices. Moreover, the acoustoelectric conversion assembly 3 is attached to the inner side wall of the secondary cavity 22, which makes full use of the internal space of the second-order resonator 2 and avoids occupying additional external space. This compact design makes the entire system more portable, compact, and easy to install and integrate. The integrated design of the acoustoelectric conversion assembly 3 and the second-order resonator 2 can simplify the structure of the acoustoelectric conversion device 01 and reduce the use of connecting components and external lines. This integrated design not only improves the reliability of the acoustoelectric conversion device 01, but also reduces the failure rate. The acoustoelectric conversion assembly 3 is usually made of flexible material and has good mechanical durability and fatigue resistance. By placing it on the side wall of the chamber of the second-order resonator 2, it can be protected from direct exposure to the external environment, thereby prolonging its service life.

[0101] On the basis of the above embodiment, the acoustoelectric conversion assembly 3 can be arranged on the inner side wall of the secondary cavity 22 opposite to the secondary cavity neck 21; and the acoustoelectric conversion assembly 3 completely covers the inner side wall of the secondary cavity 22 where it is located.

[0102] In actual use, when the acoustoelectric conversion device 01 is in working state, the air in the secondary cavity 22 of the second-order resonator 2 vibrates under the action of the sound wave. The inner side wall of the secondary cavity 22 opposite to the secondary cavity neck 21 is directly impacted by the sound wave, and the pressure fluctuation amplitude is the largest, thereby driving the friction layer of the acoustoelectric conversion assembly 3 located on the inner side wall of the secondary cavity 22 opposite to the secondary cavity neck 21 to move in contact and separation. In the process of contact and separation, the electric charge in the acoustoelectric conversion assembly 3 is transferred to form an electric current, thereby realizing the process of converting mechanical energy into electrical energy.

[0103] It should be noted that the acoustoelectric conversion assembly 3 generates static electricity on the contact surface of two different materials through triboelectric effect. The larger the area of the friction layer, the more the number of micro contact points participating in charge transfer during contact, and the total charge increases. In order to further improve the energy conversion efficiency of the acoustoelectric conversion assembly 3, the acoustoelectric conversion assembly 3 can completely cover the inner side wall of the secondary cavity 22 where it is located.

[0104] The beneficial effect of arranging the acoustic-electric conversion component 3 in the inner side wall of the secondary cavity 22 opposite to the secondary cavity neck 21 in the specific embodiment is that the side wall opposite to the neck is the area with the largest amplitude of sound pressure fluctuation in the resonator. A standing wave node is formed at this position due to the superposition of sound wave incidence and reflection, resulting in a dramatic alternation of high and low pressure. The high pressure fluctuation drives the contact-separation movement between the friction layer and the electrode layer of the acoustic-electric conversion component 3 to a greater extent, and the amount of charge transfer is significantly increased, which can effectively increase the power generation efficiency. In addition, at the natural frequency of the resonator, the air column at the neck vibrates most violently. The acoustic-electric conversion component 3 can directly couple the resonant energy at this position to achieve the peak of electromechanical conversion efficiency. By arranging the acoustic-electric conversion component 3 on the inner side wall of the second-stage resonator 2 opposite to the neck, the optimal balance between energy conversion efficiency and acoustic performance is achieved. This design is particularly suitable for scenarios that require both noise control and energy self-supply, and its core advantage lies in the use of resonance effect to capture high-intensity sound energy in a targeted manner, while minimizing the interference with the original system function through material and structural innovation.

[0105] In a specific embodiment, in order to guide the transmission of sound waves in the resonator and improve the resonance effect, a plurality of arrayed convex structures 13 can be arranged on the inner side wall of the chamber of at least one of the resonators except the last-stage resonator. The convex structures 13 are used to guide the sound waves to the neck of the next-stage resonator and improve the resonance effect of the chamber where the convex structures 13 are located, so as to amplify the sound pressure.

[0106] It should be noted that the convex structures 13 in the specific embodiment can be cylindrical protrusions, and the cylindrical protrusions are elastic structures. The convex structures 13 are arranged in a rectangular array on the inner side wall of the chamber. Figure 5 、 Figure 6 As shown in FIGS. 5 and 6, the cylindrical protrusions are arranged in a 3*6 rectangular array on the inner side wall of the chamber, and the chamber side wall where the convex structures 13 are located is provided with a neck for the sound waves to enter the chamber of the next-stage resonator, and the neck is located at the center position of the inner side wall of the chamber.

[0107] It should be noted that the convex structures 13 in the specific embodiment can be made of silicone material with elasticity, or other materials that meet the requirements, which are determined according to actual conditions and will not be described here.

[0108] Here, the convex structures 13 are arranged as elastic cylindrical protrusions. A single elastic convex structure 13 can be regarded as a micro resonant unit. When the natural frequency of the micro resonant unit is coupled with the resonant frequency of the main cavity 12, the energy capture in a specific frequency band can be significantly enhanced. In addition, the buffering effect of the elastic convex structure 13 can absorb extreme sound pressure impact and avoid hard collision between the friction layers of the acoustic-electric conversion component 3.

[0109] In the embodiment, the neck is arranged at the center of the inner side wall of the cavity, which facilitates the convex structure 13 to guide the sound wave to the position of the neck. In addition, the neck is convenient to process in the process of processing, and the convex structure 13 is convenient to arrange.

[0110] In the embodiment, the convex structure 13 is arranged to force the sound wave to reflect and diffract in the cavity multiple times, prolong the propagation path of the sound wave in the cavity, and the sound wave can be guided to the neck of the next resonator by arranging the convex structure 13 in the required array. In addition, the regularly arranged convex array can break the symmetry of the cavity, excite high-order resonant modes, effectively improve the resonance effect, and then amplify the sound pressure. The greater the sound pressure, the higher the input sound energy, and the higher the conversion energy provided by the acoustic-electric conversion assembly 3.

[0111] In an embodiment, the acoustic-electric conversion assembly 3 is a friction nano acoustic-electric conversion assembly, which includes a first friction layer 31, a second friction layer 32 and a third friction layer 33. The first friction layer 31 is arranged in close contact with the inner side wall of the cavity where the acoustic-electric conversion assembly 3 is located, and the second friction layer 32 is arranged between the first friction layer 31 and the third friction layer 33. The first friction layer 31 and the third friction layer 33 are positive electrode material layers, and the second friction layer 32 is a negative electrode material layer. The sound wave vibration drives the first friction layer 31 and the second friction layer 32 to periodically contact and separate to generate electric current.

[0112] In combination with FIGS. 1-3, Figure 1 , Figure 12 In actual use, the acoustic-electric conversion assembly 3 resonates in the cavity to drive the acoustic-electric conversion assembly 3 to periodically vibrate. Under the drive of the sound pressure, the positive electrode material layer and the negative electrode material layer vibrate and periodically contact and separate to generate alternating current. The specific steps are as follows (as shown in FIG. 4, where the shaded part is the positive electrode material layer, and the white part is the negative electrode material layer): Figure 12

[0113] Initial contact state: When the two materials contact, the electrons will transfer from the material with weak electron binding ability to the material with strong electron binding ability, and the electron transfer occurs between the positive electrode and the negative electrode. The electrons in the external circuit flow from the positive electrode material layer to the negative electrode material layer, forming a transient current.

[0114] Initial separation state: The two materials gradually separate, and the charge distribution reaches equilibrium, and there is no current in the external circuit.

[0115] Re-contact state: The two materials re-contact, and due to electrostatic induction, the positive electrode material layer induces positive charge, and the negative electrode material layer induces negative charge.

[0116] ​Re-separation state: The two materials gradually separate, the charge distribution reaches equilibrium, and there is no current in the external circuit.

[0117] It should be noted that the two materials in this process mainly refer to the third friction layer 33 and the second friction layer 32 .

[0118] In this specific embodiment, the resonator can concentrate and amplify the sound wave energy of a specific frequency through the structural characteristics of its resonant cavity. This amplified sound wave energy can directly act on the friction layer of the acoustic-to-electric conversion component 3, thereby significantly improving the output power of the acoustic-to-electric conversion component 3. In addition, the structure of the resonator is relatively simple, usually consisting of a cavity and a neck. After being combined with the acoustic-to-electric conversion component 3, the overall device can still remain compact and easy to integrate into various devices. In addition, the cavity structure of the resonator can provide stable support for the acoustic-to-electric conversion component 3, reducing the impact of external vibrations on the acoustic-to-electric conversion component; this structural stability helps to improve the reliability and durability of the entire device.

[0119] Specifically, the positive electrode material layer may be made of copper foil, and the negative electrode material layer may be made of PDMS (Polydimethylsiloxane).

[0120] It should be noted that when different materials in the acoustic-to-electric conversion component 3 come into contact, due to the different abilities of atoms to bind electrons, electrons will transfer from the material with weaker binding to the material with stronger binding, causing electrostatic charge to be generated on the surface of the material. For example, when polytetrafluoroethylene comes into contact with aluminum, electrons will transfer from aluminum to the surface of polytetrafluoroethylene, making the polytetrafluoroethylene negatively charged and the aluminum positively charged. The amount of charge is related to factors such as the contact area; therefore, the positive electrode material layer and the negative electrode material layer can also be made of other materials, which is determined according to actual conditions.

[0121] Copper foil is an excellent conductive material with high conductivity, enabling efficient charge collection and transfer. In the acoustic-to-electric conversion assembly 3, copper foil acts as the positive electrode, rapidly conducting friction-generated charge and transferring it to the external circuit, thereby improving electrical energy output efficiency. Polydimethylsiloxane is a highly electronegative material that readily absorbs negative charges during friction. Its surface effectively separates charge from the copper foil, enabling efficient charge transfer.

[0122] like Figure 1 As shown, a protruding mass block 34 is provided on the side of the third friction layer 33 facing away from the second friction layer 32 , and the mass block 34 is located at the center of the third friction layer 33 .

[0123] Specifically, the mass block 34 may be configured as a protruding cylindrical structure, and the mass block 34 is disposed at a position facing the neck of the resonator.

[0124] The mass 34 is arranged opposite the neck of the resonator, which is a key part of sound energy transmission. The arrangement of the mass can better guide the transmission of sound energy to the effective working area of the acoustic-electric conversion assembly, reducing the leakage and loss of sound energy during transmission. In addition, the presence of the mass can enhance the sound field coupling effect between the air column vibration in the resonator and the acoustic-electric conversion assembly. This enhanced coupling can make the sound energy more effectively converted into mechanical energy, and then into electrical energy, improving the sound energy utilization efficiency of the entire device.

[0125] The arrangement of the mass 34 in the specific embodiment can increase the vibration mass of the acoustic-electric conversion assembly 3 at the neck of the resonator. When sound wave vibration occurs at the neck of the resonator, the mass 34 will move with the vibration, thereby enhancing the mechanical response of the acoustic-electric conversion assembly 3. In addition, the inertia of the mass 34 can cause the acoustic-electric conversion assembly 3 to produce a larger vibration amplitude under the action of sound waves. This larger vibration amplitude can more effectively drive the contact separation or relative motion of the friction layer in the acoustic-electric conversion assembly 3, thereby improving the efficiency of electrical energy generation.

[0126] In a specific embodiment, the acoustic-electric conversion device 01 further comprises a current conversion circuit 4, which is connected with the acoustic-electric conversion assembly 3, and the current conversion circuit 4 is used to lead out the current generated by the acoustic-electric conversion assembly 3 and convert alternating current into direct current.

[0127] The arrangement of the current conversion circuit 4 can lead out the current generated by the acoustic-electric conversion assembly 3 and convert alternating current into direct current, so as to power other devices.

[0128] Specifically, the current conversion circuit 4 can include a rectifier 41 connected with the acoustic-electric conversion assembly 3 at the input end and connected with a load 42 at the output end, and a resistor 43 and a capacitor 44 connected in parallel with the rectifier 41, with the resistor 43 and the capacitor 44 connected in series in the same branch.

[0129] As shown in Figure 13 , a plurality of rectification branches are arranged, each rectification branch is provided with a rectifier 41, and the rectification branches are arranged one by one corresponding to the acoustic-electric conversion assembly 3. The current conversion circuit 4 can convert the pulse electrical energy output by the acoustic-electric conversion assembly 3 into stable direct current to power low-power devices.

[0130] In a specific embodiment, the acoustic-electric conversion device 01 further comprises a current monitoring circuit and a controller, the current monitoring circuit is connected with the acoustic-electric conversion assembly 3 and receives the electrical signal generated by the acoustic-electric conversion assembly 3, the current monitoring circuit sends the received electrical signal to the controller, and the controller judges the working state of the sound generating device 03 according to the electrical signal.

[0131] The sound generating device 03 in the embodiment can be a cooling fan, and the rotation speed of the cooling fan or the gear of the cooling fan can be determined through the electric signal, so that the working state of the cooling fan can be known in real time, and the rotation speed or the gear of the cooling fan can be adjusted according to the cooling condition.

[0132] Of course, the sound generating device 03 in the embodiment can also be other devices, which are determined according to actual conditions, and details are not described herein.

[0133] It should be noted that a display device can also be arranged to display the real-time working state of the sound generating device 03, so that the working state of the sound generating device 03 can be observed by the staff at any time, and the sound generating device 03 can be adjusted when the working state of the sound generating device 03 does not meet the requirements; or a related warning device can be arranged on the actual device, and the controller can control the warning device to send related warning information when the working state of the sound generating device 03 does not meet the requirements.

[0134] The specific structure of the current monitoring circuit in the embodiment can be set according to actual functions, which are determined according to actual conditions, and details are not described herein.

[0135] In actual use, the sound-electricity conversion device 01 in the embodiment can be used to monitor the sound of the sound generating device 03, and the current monitoring circuit can send the received electric signal to the controller. Since the electric signals generated under different working conditions are different, the controller can determine the working state of the sound generating device 03 according to the electric signal, so as to directly determine the working state of the sound generating device 03.

[0136] The application also provides a sound absorption device, which comprises at least two stages of resonators; each resonator comprises a neck and a cavity in communication with the neck, and a sound wave enters the cavity in communication with the neck from the neck and excites resonance in the cavity to amplify sound pressure; the side wall of the cavity of the upper resonator of adjacent two stages of resonators is provided with a neck for communication with the cavity of the lower resonator; the orthographic projection of the cavity of the upper resonator along the direction perpendicular to any side wall thereof falls within the orthographic projection of the cavity of the lower resonator along the direction perpendicular to the side wall.

[0137] In actual use, the sound wave enters the cavity of the first resonator from the neck of the first resonator, and the sound wave produces a sound pressure change at the neck of the first resonator, causing the air in the cavity of the first resonator to start resonating. When the frequency of the incident sound wave and the natural frequency of the resonator are equal, the air column in the neck resonates violently. The sound wave enters the cavity of the next resonator from the neck of the next resonator, and the sound wave produces a sound pressure change at the neck of the next resonator, causing the air in the cavity of the next resonator to start resonating. Until the sound wave enters the cavity of the last resonator from the neck of the last resonator, and the sound wave produces a sound pressure change at the neck of the last resonator, causing the air in the cavity of the last resonator to start resonating. The sound wave energy is converted into mechanical energy of air molecule vibration, which can achieve the effect of noise reduction.

[0138] The sound wave in the embodiment resonates through at least two resonators, which can effectively amplify the sound pressure and improve the utilization rate of sound energy. In addition, the at least two resonators can be set to different natural frequencies to cover a wider range of sound wave frequencies and achieve the absorption of a wider frequency sound.

[0139] In addition to the above-mentioned sound-electricity conversion device 01, the application also provides a sound absorption conversion equipment 02, which comprises a plurality of the above-mentioned sound-electricity conversion device 01 and a shell, or the sound absorption conversion equipment 02 comprises a plurality of the above-mentioned sound absorption device and a shell; the shell is used for installing the sound-electricity conversion device 01 or for installing the sound absorption device; and the shell is used for connecting with the sound generating device 03.

[0140] The specific shape of the shell of the sound absorption conversion equipment 02 in the embodiment can be improved according to the type and outer diameter of the sound generating device 03, and the number and arrangement of the sound-electricity conversion device 01 installed in the shell can also be changed according to actual needs, which is determined according to actual conditions.

[0141] In actual use, the sound absorption conversion equipment 02 in the embodiment is connected with the sound generating device 03, and the sound absorption conversion equipment 02 is installed on the sound transmission side of the sound generating device 03. The sound generated by the sound generating device 03 enters the sound-electricity conversion device 01 of the sound absorption conversion equipment 02; the sound wave is transmitted in the sound-electricity conversion device 01 and resonates in the cavity of the resonator; the kinetic energy generated in the sound wave resonance process drives the sound-electricity conversion assembly 3 to generate electric energy, which can be used to power other electrical equipment or store the electric energy generated by the sound-electricity conversion assembly 3 for emergency solutions.

[0142] In the embodiment, the sound absorption and conversion device 02 is arranged to realize noise reduction of the sound generated by the sound generating device 03, and to convert the sound energy into electric energy. The sound absorption and conversion device 02 can provide power support for the integrated sensors, wireless communication modules and the like, and realize self-powered operation.

[0143] On the basis of the above embodiment, the shell can be a cylindrical shell 5, and the acoustoelectric conversion device 01 is arranged on the inner side wall of the cylindrical shell 5. The necks of the first-stage resonators 1 in the acoustoelectric conversion device 01 all face away from the inner side wall of the cylindrical shell 5 where the acoustoelectric conversion device 01 is located.

[0144] Further, a connecting flange 51 can be arranged on the outer wall edge of one end of the cylindrical shell 5 in the axial direction. The connecting flange 51 extends in the radial direction of the cylindrical shell 5, and is used to connect with the sound generating device 03, so as to realize effective connection between the sound absorption and conversion device and the sound generating device 03.

[0145] As shown in Figure 10 , the sound generating device 03 is a cooling fan, and the sound absorption and conversion device 02 is connected to the sound generating device 03 through the connecting flange 51. As shown in Figure 8 , 9 , the cylindrical shell 5 is an octagonal cylindrical shell 5, which can be applied to the cooling fan of a server, and the octagonal cylindrical shell 5 has the functions of noise reduction and power generation and is suitable for space adaptation.

[0146] Of course, the cylindrical shell 5 in the embodiment can also be arranged in other shapes meeting the requirements, which is determined according to the actual situation and will not be described here.

[0147] In the embodiment, the shell is arranged as a cylindrical shell 5, which can be applied to the sound generating device 03 such as a cooling fan. The acoustoelectric conversion device 01 is arranged on the inner side wall of the cylindrical shell 5, so as to realize full and reasonable use of space.

[0148] In another embodiment, the shell can be a plate-shaped shell, and the acoustoelectric conversion device 01 is arranged on the inner side wall of the plate-shaped shell. The necks of the first-stage resonators 1 in the acoustoelectric conversion device 01 all face one side of the plate-shaped shell.

[0149] It should be noted that the plate-shaped shell can be directly attached to or embedded in a plane structure such as a wall surface, a device shell or a soundproof barrier, without the need for a complex support system. The plate-shaped shell is suitable for large-scale industrialized installation, and can also be designed as a modular unit to expand the coverage area by splicing, so as to flexibly cope with noise sources of different sizes. In addition, the surface of the plate-shaped shell can uniformly distribute a plurality of resonator units to form a wideband sound absorption array, covering a wider range of noise frequencies.

[0150] In this embodiment, the sound absorption and conversion device 02 can be installed in the soundproof barrier of the highway or viaduct, and the large-area sound absorption characteristics of the plate-shaped shell can be used to absorb traffic noise, and the sound-electricity conversion assembly 3 can be used to power the street lamps or monitoring cameras; the sound absorption and conversion device 02 can also be integrated into the outer cover of the air conditioner or the shell of the fresh air system to reduce the noise generated by the device, and the specific implementation is determined according to the actual situation, which will not be described here.

[0151] In this embodiment, the sound absorption and conversion device 02 can be installed in the soundproof barrier of the highway or viaduct, and the large-area sound absorption characteristics of the plate-shaped shell can be used to absorb traffic noise, and the sound-electricity conversion assembly 3 can be used to power the street lamps or monitoring cameras; the sound absorption and conversion device 02 can also be integrated into the outer cover of the air conditioner or the shell of the fresh air system to reduce the noise generated by the device, and the specific implementation is determined according to the actual situation, which will not be described here.

[0152] It should be noted that, in addition to the cylindrical and plate-shaped shells, the shell for installing the sound-electricity conversion device 01 can also be provided as a curved shell, a spherical shell, a cubic shell, a conical shell, a polyhedral shell, etc.

[0153] When the shell for installing the sound-electricity conversion device 01 is a spherical shell, the spherical shell has uniform stress distribution and good acoustic performance, and can receive sound wave energy from all directions; the sound-electricity conversion device 01 of the spherical shell can be installed in farmland to collect natural sound energy such as wind and rain sounds, and convert them into electrical energy to provide power for soil moisture sensors, irrigation systems, etc.; the sound-electricity conversion device of the spherical shell can be installed on a buoy to use the sound wave energy generated by sea waves and wind to power marine monitoring equipment.

[0154] When the shell for installing the sound-electricity conversion device 01 is a cubic shell, the cubic shell has a regular geometric shape, which is convenient for installation and integration, and multiple resonance cavities can be designed to improve energy collection efficiency; the sound-electricity conversion device 01 of the cubic shell can be embedded in walls or furniture to collect indoor sound and convert it into electrical energy to provide auxiliary power for smart home devices; in a factory workshop, the sound-electricity conversion device 01 of the cubic shell can be installed near the equipment to collect sound wave energy generated during the operation of the machines to power the sensor network.

[0155] When the shell for installing the sound-electricity conversion device 01 is a conical shell, the conical shell can guide the sound waves to concentrate at the neck position of the resonator, enhancing the focusing effect of sound energy. The sound-electricity conversion device 01 of the conical shell can be installed on the tower of a wind turbine to collect wind sound energy and convert it into electrical energy to provide auxiliary power for the control system of the wind turbine; on the side of a city road, the sound-electricity conversion device of the conical shell can be installed on a street lamp pole to collect traffic noise and convert it into electrical energy to provide part of the power for the street lamp.

[0156] When the shell for installing the acoustic-electric conversion device 01 is a polyhedral shell, the polyhedral shell can be designed as a complex geometric shape with multiple faces and edges, capable of receiving acoustic wave energy from multiple directions. The acoustic-electric conversion device 01 of the polyhedral shell can be installed on the facade or roof of a building to collect wind, rain and environmental noise to provide power for intelligent devices inside the building; the acoustic-electric conversion device 01 of the polyhedral shell installed on an outdoor billboard can collect acoustic wave energy from the surrounding environment to provide auxiliary power for the lighting and display system of the billboard.

[0157] In addition to the above-mentioned sound absorption conversion device 02, the application also provides a server comprising the above-mentioned sound absorption conversion device 02 and a sound generating device 03 connected with the sound absorption conversion device 02.

[0158] In a specific embodiment, the above-mentioned sound absorption conversion device 02 can be installed in the server's cooling fan, and the natural frequency of at least two stages of resonators is designed for the frequency of the noise generated by the cooling fan to absorb and reduce the noise generated by the cooling fan, and the acoustic energy is converted into electric energy through the acoustic-electric conversion assembly 3.

[0159] Of course, the above-mentioned sound absorption conversion device 02 can also be installed in the mechanical hard disk in the server, and the hard disk read-write head seeks and the disk rotates to generate low-frequency mechanical vibration noise and high-frequency screeching; the natural frequency of at least two stages of resonators is designed for the low-frequency mechanical vibration noise and high-frequency screeching generated by the mechanical hard disk to absorb and reduce the noise generated by the mechanical hard disk, and the acoustic energy is converted into electric energy through the acoustic-electric conversion assembly 3.

[0160] In the specific embodiment, by setting the sound absorption conversion device 02 in the server, the noise level of the internal noise source of the server can be effectively reduced, and the environmental noise pollution of the data center or computer room is reduced, and the comfort and work efficiency of the operation and maintenance personnel are improved; in addition, the self-powered system reduces the demand for traditional power wiring, simplifies the equipment architecture, and is especially suitable for edge computing nodes or distributed server clusters; the self-powered sensor network reduces the frequency of manual inspection, and the intelligent early warning system reduces the cost of fault repair.

[0161] The above describes in detail the acoustic-electric conversion device, sound absorption device, sound absorption conversion device and server provided by the application. In this paper, specific examples are applied to explain the principles and implementation modes of the application. The above examples are only used to help understand the method and core idea of the application. It should be noted that for ordinary skilled persons in the technical field, without departing from the principles of the application, some improvements and modifications can be made to the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. An acoustic-to-electric conversion device, characterized in that: include: At least two stages of resonators and an acoustic-to-electric conversion component (3) arranged on the last stage of the resonator; Each stage of the resonator includes a neck and a cavity connected to the neck, and the side wall of the cavity of the upper stage of the resonator in two adjacent stages is provided with a neck connected to the cavity of the lower stage of the resonator; The orthographic projection of the cavity of the resonator of the upper level in a direction perpendicular to any side wall thereof falls within the orthographic projection of the cavity of the resonator of the lower level in a direction perpendicular to the side wall thereof; Except for the resonator of the last stage, the inner side wall of the cavity of at least one of the remaining resonators is provided with a plurality of array-distributed convex structures (13), and the convex structures (13) are used to guide the sound waves to the neck of the resonator of the next stage and improve the resonance effect of the cavity where the convex structures (13) are located, so as to amplify the sound pressure.

2. The acoustic-to-electric conversion device according to claim 1, wherein The resonator comprises a first-stage resonator (1) and at least two second-stage resonators (2), wherein the at least two second-stage resonators (2) are arranged on the circumferential outside of the first-stage resonator (1).

3. The acoustic-to-electric conversion device according to claim 2, characterized in that: The first-stage resonator (1) comprises a prismatic main cavity (12), wherein one end of the main cavity (12) along the axial direction is provided with a main cavity neck (11) for allowing sound waves to enter; A second-stage resonator (2) is correspondingly provided on any side wall of the main cavity (12), and the second-stage resonator (2) comprises a secondary cavity (22) and a secondary cavity neck (21) provided on the corresponding side wall of the main cavity (12); The sound waves after resonance in the main cavity (12) enter the secondary cavity (22) from the secondary cavity neck (21) and generate resonance in the secondary cavity (22).

4. The acoustic-to-electric conversion device according to claim 3, characterized in that: The acoustic-electric conversion device (01) is a rectangular parallelepiped or cube structure, and the main cavity (12) is a rectangular parallelepiped; The number of the second-stage resonators (2) is four, and the four second-stage resonators (2) are arranged in a one-to-one correspondence with the four side walls of the main cavity (12); the cross section of the secondary cavity (22) is trapezoidal.

5. The acoustic-to-electric conversion device according to claim 4, characterized in that: The cross section of the main cavity neck opening (11) is circular, and the cross section of the secondary cavity neck opening (21) is square.

6. The acoustic-to-electric conversion device according to claim 4, characterized in that: At least one side wall of the secondary cavity (22) is provided with the acoustic-to-electric conversion component (3), and the acoustic-to-electric conversion component (3) is provided on the inner side wall of the secondary cavity (22); The acoustic-electric conversion component (3) is in sheet form and attached to the inner wall of the secondary cavity (22).

7. The acoustic-to-electric conversion device according to claim 6, characterized in that: The acoustic-electric conversion component (3) is provided on the inner side wall of the secondary cavity (22) opposite to the secondary cavity neck opening (21).

8. The acoustic-to-electric conversion device according to claim 1, wherein: The convex structure (13) is a cylindrical protrusion, and the cylindrical protrusion is an elastic structure; the convex structure (13) is distributed in a rectangular array on the inner side wall of the chamber.

9. The acoustic-to-electric conversion device according to claim 8, characterized in that: The side wall of the chamber where the convex structure (13) is located is provided with a neck for allowing sound waves to enter the chamber of the resonator of the next stage, and the neck is located at the center of the inner wall of the chamber where the convex structure (13) is located.

10. The sound-to-electricity conversion device according to any one of claims 1 to 9, characterized in that: The acoustic-to-electric conversion component (3) comprises a first friction layer (31), a second friction layer (32) and a third friction layer (33), wherein the first friction layer (31) is arranged in contact with the inner wall of the chamber where the acoustic-to-electric conversion component (3) is located, and the second friction layer (32) is arranged between the first friction layer (31) and the third friction layer (33); The first friction layer (31) and the third friction layer (33) are positive electrode material layers, and the second friction layer (32) is a negative electrode material layer. Acoustic vibration drives the first friction layer (31) and the second friction layer (32) to periodically contact and separate to generate current.

11. The acoustic-to-electric conversion device according to claim 10, characterized in that: The positive electrode material layer is made of copper foil, and the negative electrode material layer is made of polydimethylsiloxane.

12. The sound-to-electricity conversion device according to any one of claims 1 to 9, characterized in that: A raised mass block (34) is provided on the side of the side wall of the acoustic-to-electric conversion component (3) facing away from the cavity in which the component is located. The mass block (34) is located at the center of the surface of the acoustic-to-electric conversion component (3).

13. The sound-to-electricity conversion device according to any one of claims 1 to 9, characterized in that: It also includes a current conversion circuit (4), which is connected to the acoustic-to-electric conversion component (3) and is used to convert the alternating current output by the acoustic-to-electric conversion component (3) into direct current.

14. The acoustic-to-electric conversion device according to claim 13, characterized in that: The current conversion circuit (4) includes a rectifier (41) whose input end is connected to the acoustic-to-electrical conversion component (3) and whose output end is connected to a load (42), and a resistor (43) and a capacitor (44) connected in parallel with the rectifier (41), wherein the resistor (43) and the capacitor (44) are connected in series in the same branch.

15. The sound-to-electricity conversion device according to any one of claims 1 to 9, characterized in that: It also includes a current monitoring circuit and a controller, wherein the current monitoring circuit is connected to the sound-to-electricity conversion component (3) and receives the electric signal generated by the sound-to-electricity conversion component (3), and the current monitoring circuit sends the received electric signal to the controller, and the controller determines the working state of the sound generating device (03) based on the electric signal.

16. A sound absorbing device, characterized in that: include: at least two stages of resonators; Each stage of the resonator includes a neck and a cavity communicating with the neck; and the side wall of the cavity of the upper stage of the resonator of two adjacent stages is provided with a neck for communicating with the cavity of the resonator of the lower stage; The orthographic projection of the cavity of the resonator of the upper level in a direction perpendicular to any side wall thereof falls within the orthographic projection of the cavity of the resonator of the lower level in a direction perpendicular to the side wall thereof; Except for the resonator of the last stage, the inner side wall of the cavity of at least one of the remaining resonators is provided with a plurality of array-distributed convex structures (13), and the convex structures (13) are used to guide the sound waves to the neck of the resonator of the next stage and improve the resonance effect of the cavity where the convex structures (13) are located, so as to amplify the sound pressure.

17. A sound absorption and conversion device, characterized in that: The device comprises the sound-to-electric conversion device (01) and a shell according to any one of claims 1 to 15, or the sound absorption conversion device comprises the sound absorption device and a shell according to claim 16; The shell is used to install a plurality of the sound-to-electricity conversion devices (01) or the sound absorption devices, and the shell is used to be connected to a sound generating device (03).

18. The sound absorption conversion device according to claim 17, characterized in that: The shell is a cylindrical shell (5), the acoustic-to-electric conversion device (01) is arranged on the inner side wall of the cylindrical shell (5), and the neck of the first-stage resonator (1) in the acoustic-to-electric conversion device (01) is oriented toward the side of the inner side wall of the cylindrical shell (5) away from the acoustic-to-electric conversion device (01).

19. The sound absorption conversion device according to claim 18, characterized in that A connecting flange (51) is provided on the outer wall edge of one axial end of the cylindrical shell (5), the connecting flange (51) extending in the radial direction of the cylindrical shell (5), and the connecting flange (51) is used to connect to the sound generating device (03).

20. The sound absorption conversion device according to claim 17, characterized in that The shell is a plate-shaped shell, the acoustic-to-electric conversion device (01) is arranged on the inner side wall of the plate-shaped shell, and the neck of the first-stage resonator (1) in the acoustic-to-electric conversion device (01) faces one side of the plate-shaped shell.

21. A server, characterized in that: The invention comprises the sound absorption conversion device (02) as claimed in any one of claims 17 to 20 and a sound generating device (03) connected to the sound absorption conversion device (02).

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