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

Abstract

The invention discloses an acoustic-electric conversion device, a sound absorption device, sound absorption conversion equipment and a server, and relates to the technical field of acoustic noise reduction and energy recovery, and the acoustic-electric conversion device comprises at least two stages of resonators and an acoustic-electric conversion assembly arranged on the last stage of resonator; and resonance of sound waves in the cavity of the last stage of resonator drives the acoustic-electric conversion assembly to generate current. At least two stages of resonators can be set to have different inherent frequencies so as to cover a wider sound wave frequency range and realize absorption of sound with a wider frequency. Besides, through the arrangement of the sound-electricity conversion assembly, sound energy can be converted into electric energy, effective utilization of the sound energy is achieved, the technical problems that when the server runs, the noise reduction effect of the cooling fan is not ideal, and noise resources cannot be effectively utilized are solved, and the technical effects that the noise frequency of the cooling fan is covered, noise is effectively reduced, and the sound energy is converted into the electric energy are achieved.

Description

Technical Field

[0001] This application relates to the technical fields of acoustic noise reduction and energy recovery, and particularly to an acoustic-electric conversion device, an absorption device, a sound absorption and conversion device, and a server. Background Art

[0002] When a server is running, the noise generated by the cooling fan has become a non-negligible environmental pollution source. For a typical 1U server under full-load conditions, the fan noise can reach 45 - 75 dB, and its spectrum shows significant broadband characteristics: the low-frequency band (200 - 500 Hz) is mainly caused by the vibration of the fan motor and the periodic flapping of the blades against the air, while the high-frequency band (1 - 4 kHz) results from air flow turbulence and duct resonance. Such noise not only poses a risk of hearing damage to personnel but also reduces work efficiency.

[0003] To solve the noise problem during the operation of the server, generally, passive sound-absorbing materials are used to absorb noise, active noise reduction systems are used to reduce noise, and duct aerodynamic optimization and other solutions are adopted. However, in the actual implementation process, the absorption coefficient of porous sound-absorbing materials for low-frequency sound waves (<500 Hz) is lower than 0.3, resulting in an actual noise reduction effect of less than 5 dB; active noise reduction relies on reverse sound wave interference, requires additional power supply, and can only suppress narrow-band steady-state noise, and cannot handle broadband random turbulence sound; duct optimization reduces noise by reducing the air flow speed, but due to the limited space of the server, the noise reduction amplitude is usually less than 3 dB. Summary of the Invention

[0004] This application provides an acoustic-electric conversion device. At least two stages of resonators can be set to different natural frequencies to cover a wider sound wave frequency range and achieve the absorption of sound waves with a wider frequency range. In addition, the setting of the acoustic-electric conversion component can convert sound energy into electrical energy, realizing the effective utilization of sound energy, so as to at least solve the problems in the related art that broadband noise reduction cannot be processed and sound energy cannot be effectively utilized.

[0005] This application provides an acoustic-electric conversion device, including:

[0006] At least two stages of resonators and an acoustic-electric conversion component arranged on the last stage of the resonator;

[0007] Each stage of the resonator includes a neck and a chamber communicating with the neck, and a neck communicating with the chamber of the lower-stage resonator is provided on the side wall of the upper-stage chamber of two adjacent stages of resonators; the orthographic projection of the chamber of the upper-stage resonator along the direction perpendicular to any one of its side walls falls within the orthographic projection of the chamber of the lower-stage resonator along the direction perpendicular to this side wall.

[0008] On the one hand, the resonator includes a first-stage resonator and at least two second-stage resonators, and at least two second-stage resonators are arranged around the outer circumference of the first-stage resonator.

[0009] On the other hand, the first - stage resonator includes a prismatic main cavity, and a main cavity neck for allowing sound waves to enter is provided at one axial end of the main cavity;

[0010] A second - stage resonator is correspondingly provided on any side wall of the main cavity. The second - stage resonator includes a secondary cavity and a secondary cavity neck provided on the corresponding side wall of the main cavity;

[0011] The sound waves resonated in the main cavity enter the secondary cavity through the secondary cavity neck and resonate in the secondary cavity.

[0012] On the other hand, the acoustic - electric conversion device has a cuboid or cube 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 correspondingly arranged with the four side walls of the main cavity one by one; the cross - section of the secondary cavity is trapezoidal.

[0014] On the other hand, the cross - section of the main cavity neck is circular, and the cross - section of the secondary cavity neck is square.

[0015] On the other hand, the acoustic - electric conversion component is provided on at least one side wall of the secondary cavity, and the acoustic - electric conversion component is provided on the inner side wall of the secondary cavity;

[0016] The acoustic - electric conversion component is attached to the inner side wall of the secondary cavity in a sheet shape.

[0017] On the other hand, the acoustic - electric conversion component is provided on the inner side wall of the secondary cavity opposite to the secondary cavity neck.

[0018] On the other hand, except for the resonators of the last stage, convex structures are provided on the inner side wall of the cavity of at least one of the remaining resonators and are distributed in an array. The convex structures are used to guide sound waves to the neck of the resonator of the next stage and improve the resonance effect of the cavity where the convex structures are located to amplify the sound pressure.

[0019] On the other hand, the convex structure is a cylindrical protrusion, and the cylindrical protrusion is an elastic structure; the convex structures are distributed in a rectangular array on the inner side wall of the cavity.

[0020] On the other hand, a neck for allowing sound waves to enter the cavity of the resonator of the next stage is provided on the side wall of the cavity where the convex structure is located, and the neck is located at the center position of the inner side wall of the cavity where it is located.

[0021] On the other hand, the acoustic-to-electric conversion component includes a first friction layer, a second friction layer and a third friction layer, the first friction layer is arranged in contact with the inner wall of the chamber where the acoustic-to-electric conversion component is located, and 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, 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 current.

[0023] On the other hand, the positive electrode material layer is made of copper foil, and the negative electrode material layer is made of polydimethylsiloxane.

[0024] On the other hand, a protruding mass block is provided on the side of the side wall of the acoustic-to-electric conversion component that is away from the chamber in which the acoustic-to-electric conversion component is located, and the mass block is located at the center of the surface of the acoustic-to-electric conversion component.

[0025] On the other hand, it also includes a current conversion circuit, which is connected to the acoustic-to-electric conversion component and is used to convert the alternating current output by the acoustic-to-electric conversion component into direct current.

[0026] On the other hand, the current conversion circuit includes a rectifier whose input end is connected to the sound-to-electric conversion component and whose output end is connected to the load, and a resistor and a capacitor connected in parallel with the rectifier, wherein the resistor and the capacitor are connected in series in the same branch.

[0027] On the other hand, it also includes a current monitoring circuit and a controller. The current monitoring circuit is connected to the sound-to-electric conversion component and receives the electrical signal generated by the sound-to-electric conversion component. The current monitoring circuit sends the received electrical signal to the controller, and the controller determines the working status of the sound generating device based on the electrical signal.

[0028] The present 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 connected to the neck; and the side wall of the chamber of the upper stage of the resonator of two adjacent stages is provided with a neck for communicating with the chamber of the resonator of the lower stage;

[0030] The orthographic projection of the cavity of the resonator of the previous stage along a direction perpendicular to any side wall thereof falls within the orthographic projection of the cavity of the resonator of the next stage along a direction perpendicular to the side wall.

[0031] The present application also provides a sound absorption conversion device, comprising a plurality of the above-mentioned sound-to-electric conversion devices and a housing, or the above-mentioned sound absorption conversion device comprises a plurality of the above-mentioned sound absorption devices and a housing;

[0032] The housing is used to mount the acoustic-electric conversion device or the sound absorption device, and the housing is used to connect to a sound generating device.

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

[0034] On the other hand, a connecting flange is arranged at the outer wall edge of one end of the axial direction of the cylindrical housing. The connecting flange has an extension along the radial direction of the cylindrical housing, and the connecting flange is used to connect to a sound generating device.

[0035] On the other hand, the housing is a plate-shaped housing, the acoustic-electric conversion device is arranged on the inner side wall of the plate-shaped housing, and the necks of the first-stage resonators in the acoustic-electric conversion device all face one side of the plate-shaped housing.

[0036] This application also provides a server, including the sound absorption and conversion device described in any one of the above and a sound generating device connected to the sound absorption and conversion device.

[0037] Through this application, since there are at least two stages of resonators, during actual use, sound waves enter the chamber of the first-stage resonator from the neck of the first-stage resonator. The sound waves generate a sound pressure change at the neck of the first-stage resonator and resonate in the chamber of the first-stage resonator. The resonated sound waves enter the chamber of the next-stage resonator through the neck of the next-stage resonator until the sound waves enter the chamber of the last-stage resonator and resonate in the chamber of the last-stage resonator; during this process, the sound waves resonate through at least two stages of resonators. While the sound waves resonate in the chamber of the last-stage resonator, they drive the acoustic-electric conversion component to generate current, realizing the absorption of sound waves and converting sound energy into electrical energy; it can be used for acoustic noise reduction and the recovery of sound energy.

[0038] In this application, the sound waves resonate through at least two stages of resonators, which can effectively amplify the sound pressure and improve the utilization rate of sound energy; in addition, at least two stages of resonators can be set to different natural frequencies so as to cover a wider sound wave frequency range and realize the absorption of sounds with a wider frequency. In addition, the setting of the acoustic-electric conversion component can convert sound energy into electrical energy and realize the effective utilization of sound energy. Therefore, it can solve the technical problem that the noise reduction effect of the cooling fan during the operation of the server is not ideal and the noise resources cannot be effectively utilized, and achieve the technical effect of covering the noise frequency of the cooling fan, effectively reducing noise and converting sound energy into electrical energy.

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

[0040] To more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0041] Figure 1 An exploded schematic diagram of an electroacoustic conversion device provided by an embodiment of the present application;

[0042] Figure 2 An external view schematic diagram of an electroacoustic conversion device provided by an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the structure after separation of the part with the main cavity neck opening and the main body part in an electroacoustic conversion device provided by an embodiment of the present application;

[0044] Figure 4 An internal structure schematic diagram of an electroacoustic conversion device provided by an embodiment of the present application;

[0045] Figure 5 For Figure 4 The cross-sectional schematic diagram of the electroacoustic conversion device in

[0046] Figure 6 For Figure 5 The front view schematic diagram of the electroacoustic conversion device in

[0047] Figure 7 For Figure 4 The side view schematic diagram of the electroacoustic conversion device in

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

[0049] Figure 9 For Figure 8 The structural schematic diagram of the cylindrical shell of the sound absorption conversion device in

[0050] Figure 10 For Figure 8 The structural schematic diagram of the sound absorption conversion device installed in the sound generating device in

[0051] Figure 11 For Figure 10 The structural schematic diagram of the sound generating device in

[0052] Figure 12 Schematic diagram of the working process of the acoustic-electric conversion component provided by the embodiment of the present application;

[0053] Figure 13 Schematic diagram of the structure of the current conversion circuit provided by the embodiment of the present application.

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

[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 - Secondary cavity neck, 22 - Secondary cavity;

[0058] 3 - Acoustic-electric conversion component, 31 - First friction layer, 32 - Second friction layer, 33 - Third friction layer, 34 - Mass block;

[0059] 4 - Current conversion circuit, 41 - Rectifier, 42 - Load, 43 - Resistor, 44 - Capacitor;

[0060] 02 - Sound absorption and conversion device;

[0061] 5 - Cylindrical shell, 51 - Connecting flange, 52 - Installation groove;

[0062] 03 - Sound generating device. Detailed implementation manners

[0063] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a 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 of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

[0064] It should be noted that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. The terms "mounted", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. The terms "parallel", "perpendicular", "equal" include the described situations and situations similar to the described situations, and the range of the similar situations is within the acceptable deviation range, where the acceptable deviation range is determined by those of ordinary skill in the art considering the measurements being discussed and the errors associated with the measurements of specific quantities (i.e., the limitations 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° deviation; "perpendicular" includes absolute perpendicular and approximate perpendicular, and the acceptable deviation range of approximate perpendicular can also be, for example, within 5° deviation. "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 equal ones is less than or equal to 5% of either one of them. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

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

[0066] An embodiment of the present application provides an acoustic-electric conversion device 01. The acoustic-electric conversion device 01 includes at least two stages of resonators and an acoustic-electric conversion component 3 provided in the resonator of the last stage; and the resonance of the sound wave in the cavity of the resonator of the last stage drives the acoustic-electric conversion component 3 to generate current; each stage of resonator includes a neck opening and a cavity communicating with the neck opening. The sound wave enters the cavity communicating with the neck opening from the neck opening and excites resonance in the cavity to amplify the sound pressure; the side wall of the cavity of the upper stage of the adjacent two stages of resonators is provided with a neck opening for communicating with the cavity of the lower stage of the resonator; the orthographic projection of the cavity of the upper stage resonator along the direction perpendicular to any one of its side walls falls within the orthographic projection of the cavity of the lower stage resonator along the direction perpendicular to this side wall.

[0067] It should be noted that the orthographic projection of the chamber of the upper-level resonator along the direction perpendicular to any of its side walls falls within the orthographic projection of the chamber of the lower-level resonator along the direction perpendicular to this side wall. Specifically, it means that the orthographic projection of the chamber of the upper-level resonator along the direction perpendicular to any of its side walls onto this side wall falls within the orthographic projection of the chamber of the lower-level resonator along the direction perpendicular to this side wall onto this 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 extending 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 where it is located, or the extending 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 where it is located, which is specifically determined according to the actual situation and will not be elaborated here.

[0068] It should be noted that the resonator in this specific embodiment can be a Helmholtz resonator or other resonators that meet the requirements, which is specifically determined according to the actual situation; the acoustic-electric conversion component 3 in this specific embodiment can be set as a triboelectric nanogenerator acoustic-electric conversion component or other acoustic-electric conversion components that meet the requirements, which is specifically determined according to the actual situation.

[0069] In at least two levels of resonators in this specific embodiment, the number of resonators in each level can be one or multiple, which is specifically determined according to the actual situation and will not be elaborated here.

[0070] The layout method of at least two levels of resonators can be to surround the lower-level resonator around the outer periphery of the upper-level resonator, or to arrange the lower-level resonator on one side of the upper-level resonator, which is specifically determined according to the actual situation and will not be elaborated here.

[0071] In order to enable at least two levels of resonators to achieve a wider frequency coverage of sound waves and have a noise reduction effect on both low-frequency and high-frequency noises, different resonators in at least two levels of resonators can be set to have different natural frequencies. Of course, some resonators in at least two levels of resonators can also be set to have different natural frequencies, which is specifically determined according to the actual situation and will not be elaborated here.

[0072] During the actual setting process, according to the frequency characteristics of the noise source to be reduced, the number of levels of resonators or the number of resonators in the same level can be adjusted, which is specifically determined according to the actual situation and will not be elaborated here.

[0073] Sound waves enter the chamber of the resonator of the first stage through the neck of the resonator of the first stage. Sound pressure changes occur at the neck of the resonator of the first stage, causing the air in the chamber of the resonator of the first stage to start resonating. When the frequency of the incident external sound waves is equal to the natural frequency of the resonator, the air column in the neck vibrates violently due to resonance. The sound waves enter the chamber of the resonator of the next stage through the neck of the resonator of the next stage from the chamber of the resonator of the first stage. Sound pressure changes occur at the neck of the resonator of the next stage, causing the air in the chamber of the resonator of the next stage to start resonating, until the sound waves enter the chamber of the resonator of the last stage. Sound pressure changes occur at the neck of the resonator of the last stage, causing the air in the chamber of the resonator of the last stage to start resonating. The resonance of the air in the chamber of the resonator of the last stage drives the acoustic-electric conversion component 3 to generate current.

[0074] During actual use, sound waves enter the chamber of the resonator of the first stage through the neck of the first-stage resonator 1. Sound pressure changes occur at the neck of the resonator of the first stage and resonance occurs in the chamber of the resonator of the first stage. The resonated sound waves enter the chamber of the resonator of the next stage through the neck of the resonator of the next stage until the sound waves enter the chamber of the resonator of the last stage and resonance occurs in the chamber of the resonator of the last stage. During this process, the sound waves resonate through at least two stages of resonators. While the sound waves resonate in the chamber of the resonator of the last stage, they drive the acoustic-electric conversion component 3 to generate current, achieving the absorption of sound waves and converting sound energy into electrical energy. It can be used for acoustic noise reduction and the recovery of sound energy.

[0075] In this specific embodiment, the sound waves resonate through at least two stages of resonators, which can effectively amplify the sound pressure and improve the utilization rate of sound energy. In addition, at least two stages of resonators can be set to different natural frequencies to cover a wider range of sound wave frequencies and achieve the absorption of sounds with a wider frequency range. Moreover, the setting of the acoustic-electric conversion component 3 can convert sound energy into electrical energy and achieve the effective utilization of sound energy. Therefore, it can solve the technical problems of unsatisfactory noise reduction effect of the cooling fan during the operation of the server and the ineffective utilization of noise resources, and achieve the technical effects of covering the noise frequency of the cooling fan, effectively reducing noise and converting sound energy into electrical energy.

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

[0077] During actual use, sound waves enter the chamber of the first-stage resonator 1 through the neck of the first-stage resonator 1. Sound pressure changes occur at the neck of the first-stage resonator 1, causing the air in the chamber of the first-stage resonator 1 to start resonating. When the frequency of the incident external sound wave is equal to the natural frequency of the first-stage resonator 1, the air column in the neck vibrates violently due to resonance. The sound waves in the chamber of the first-stage resonator 1 enter the chamber of the second-stage resonator 2 through the neck of the second-stage resonator 2. Sound pressure changes occur at the neck of the second-stage resonator 2, causing the air in the chamber of the second-stage resonator 2 to start resonating. When the frequency of the incident external sound wave is equal to the natural frequency of the second-stage resonator 2, the air column in the neck vibrates violently due to resonance.

[0078] In this specific embodiment, since at least two second-stage resonators 2 are provided, during actual use, the sound waves in the chamber of the first-stage resonator 1 will be guided to the necks of different second-stage resonators 2, and the sound waves will be amplified again and resonate by different second-stage resonators 2. Two-stage resonance for sound waves can be achieved, effectively increasing the sound pressure, and at least two second-stage resonators 2 can be set to different natural frequencies to cope with the absorption of sounds with a wider frequency range. In addition, by setting at least two second-stage resonators 2, an electroacoustic conversion component 3 can be provided in each second-stage resonator 2, which can effectively increase the number of electroacoustic conversion components 3 provided and improve the conversion efficiency of sound energy.

[0079] On the basis of the above embodiment, the resonator can include a first-stage resonator 1, at least two second-stage resonators 2, and at least two third-stage resonators. At least two second-stage resonators 2 are arranged around the outer circumference of the first-stage resonator 1 in the circumferential direction; at least two third-stage resonators are arranged around the outer circumference of the second-stage resonator 2.

[0080] During actual use, sound waves enter the chamber of the first-stage resonator 1 from the neck opening of the first-stage resonator 1. The sound waves generate a sound pressure change at the neck opening of the first-stage resonator 1, causing the air in the chamber of the first-stage resonator 1 to start resonating. When the frequency of the incident external sound waves is equal to the natural frequency of the first-stage resonator 1, the air column in the neck vibrates violently due to resonance. The sound waves in the chamber of the first-stage resonator 1 enter the chamber of the second-stage resonator 2 through the neck opening of the second-stage resonator 2. The sound waves generate a sound pressure change at the neck opening of the second-stage resonator 2, causing the air in the chamber of the second-stage resonator 2 to start resonating. When the frequency of the incident external sound waves is equal to the natural frequency of the second-stage resonator 2, the air column in the neck vibrates violently due to resonance. The sound waves in the chamber of the second-stage resonator 2 enter the chamber of the third-stage resonator through the neck opening of the third-stage resonator. The sound waves generate a sound pressure change at the neck opening of the third-stage resonator, causing the air in the chamber of the third-stage resonator to start resonating. When the frequency of the incident external sound waves is equal to the natural frequency of the third-stage resonator, the air column in the neck vibrates violently due to resonance.

[0081] In this specific embodiment, since there are at least two second-stage resonators 2 and at least two third-stage resonators, during actual use, the sound waves in the chamber of the first-stage resonator 1 will be guided to the neck openings of different second-stage resonators 2, and the sound waves will be amplified again and resonate by different second-stage resonators 2. The sound waves in the chamber of the second-stage resonator 2 will be guided to different neck openings, and the sound waves in different third-stage chambers will be guided to different ones to amplify the sound waves again and generate resonance. Three-stage resonance for sound waves can be achieved, effectively increasing the sound pressure, and at least two second-stage resonators 2 and at least two third-stage resonators can be set to different natural frequencies to cope with the absorption of sounds with a wider frequency range. In addition, by setting at least two third-stage resonators, an electroacoustic conversion component 3 can be provided in each third-stage resonator, which can effectively increase the number of electroacoustic conversion components 3 provided and improve the conversion efficiency of sound energy.

[0082] Of course, the electroacoustic conversion device in this application can also include a four-stage resonator or a five-stage resonator or resonators with other numbers of stages, which are specifically determined according to the actual situation and will not be elaborated here.

[0083] In addition, in this application, the electroacoustic conversion component 3 can be provided only in the resonator of the last stage to ensure the full and effective utilization of sound energy. According to different actual situations, the electroacoustic conversion component 3 can also be provided in the resonators of other stages, which is specifically determined according to the actual situation.

[0084] On the basis of the above embodiments, the first - stage resonator 1 may include a prismatic main cavity 12. At one end of the main cavity 12 along the axial direction, there is a main cavity neck 11 for allowing sound waves to enter; on any side wall of the main cavity 12, a second - stage resonator 2 is correspondingly arranged. The second - stage resonator 2 includes a secondary cavity 22 and a secondary cavity neck 21 arranged on the corresponding side wall of the 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 this specific embodiment can be a quadrangular prism structure, or other prism structures such as a pentagonal prism or a hexagonal prism, which is specifically determined according to the actual situation; when the main cavity 12 is a quadrangular prism structure, four second - stage resonators 2 can be set, and the four second - stage resonators 2 respectively correspond to the four side edges of the quadrangular prism one by one; when the main cavity 12 is a pentagonal prism structure, five second - stage resonators 2 can be set, and the five second - stage resonators 2 respectively correspond to the four side edges of the pentagonal prism one by one.

[0086] In this specific embodiment, by setting the main cavity 12 as a prism, the prismatic main cavity 12 can flexibly change the cavity volume and geometric ratio by adjusting the side length, angle and height of the bottom polygon, so as to more accurately control the resonance frequency; in addition, the edges and flat walls of the polyhedral cavity can guide the sound waves to generate multiple reflections and interferences 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. It significantly optimizes the acoustic performance and engineering applicability of the resonator, especially suitable for scenarios with strict requirements for space, frequency adaptability and energy recovery efficiency.

[0087] Specifically, as Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 shown, the overall structure of the acoustic - electric conversion device 01 can be set as a cuboid or cube structure, 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 arranged corresponding to the four side walls of the main cavity 12 one by one; the cross - section of the secondary cavity 22 is trapezoidal.

[0088] As Figure 2 shown, the overall structure of the acoustic - electric conversion device 01 is in the shape of a cube or cuboid. During the actual installation process, since the acoustic - electric conversion device 01 is a regular cube or cuboid, it is convenient to install the acoustic - electric conversion device 01, and multiple acoustic - electric conversion devices 01 can be arranged in an orderly manner, so that the acoustic - electric conversion device 01 can effectively utilize space during the installation process and avoid space waste.

[0089] As Figure 3 shown, the cross - section of the main cavity neck 11 is circular, asFigure 5 , Figure 6 As shown in Figure 6 , the cross-section of the secondary cavity neck 21 is square.

[0090] In this specific embodiment, the cross-section of the primary cavity neck 11 is set to be circular, which can be applicable to the case where the cross-section of the channel for transmitting sound waves is circular, facilitating processing; the cross-section of the secondary cavity neck 21 is set to be square. Since the secondary cavity neck 21 is disposed on the side wall of the primary cavity 12, and the primary cavity 12 is a quadrangular prism structure, the side wall of the primary cavity 12 is a rectangular or square structure. Setting the cross-section of the secondary cavity neck 21 to be square corresponds to the shape of the side wall of the primary cavity 12 where it is located, facilitating processing.

[0091] In a specific embodiment, the primary cavity 12 of the first-stage resonator 1 can be set to be cylindrical, and the primary cavity neck 11 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. The cross-section of the secondary cavity 22 of the second-stage resonator 2 is fan-shaped, so that the overall structure of the acoustic-electric conversion device 01 is cylindrical.

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

[0093] In this specific embodiment, by setting the overall structure of the acoustic-electric conversion device 01 to be cylindrical, it is convenient to install the acoustic-electric conversion device 01 into a cylindrical space to meet the installation requirements of different spaces. In addition, the cylindrical structure has axial symmetry, which can enable sound waves to propagate along the axis. This directional propagation characteristic makes the cylindrical acoustic-electric conversion device 01 particularly suitable for scenarios requiring directional acoustic output, such as in the fields of audio equipment, acoustic speakers, etc. In addition, the manufacturing process of the cylindrical structure is relatively simple. Due to its axial symmetry, the cylindrical resonator can be efficiently manufactured by processes such as rotational molding and stretch molding, reducing the manufacturing cost.

[0094] In another specific embodiment, the primary cavity 12 of the first-stage resonator 1 can be set to be spherical, and the primary cavity neck 11 is located on 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. The cross-section of the secondary cavity 22 of the second-stage resonator 2 is fan-shaped, so that the overall structure of the acoustic-electric conversion device 01 is a spherical shape with a notch, and the primary cavity neck 11 is provided at the notch.

[0095] In this specific embodiment, the acoustic-electric conversion device 01 is set as a spherical shape with a notch. During actual use, it can be installed into a spherical space to meet the installation requirements of different-shaped spaces. The spherical structure has excellent stability in mechanics. Due to its surface curvature, the spherical structure can evenly 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. Additionally, the main cavity 12 of the spherical shape has symmetry, which can make sound waves evenly distribute inside the main cavity 12. This uniformity can reduce the reflection and interference of sound waves inside the main cavity 12, thereby improving the acoustic performance. Compared with traditional cylindrical or other-shaped resonators, the spherical resonator can more effectively achieve the resonance of sound waves and enhance the acoustic effect. Moreover, the main cavity 12 of the spherical structure has a wider frequency response range. Due to its symmetry and uniform sound field distribution, the spherical resonator can better adapt to the input of sound waves with different frequencies, thus enabling a wider range of acoustic applications.

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

[0097] Specifically, the acoustic-electric conversion component 3 covers at least part of the inner side wall of the secondary cavity 22 where it is located.

[0098] In this specific embodiment, the acoustic-electric conversion component 3 can be provided on all side walls of the secondary cavity 22, or a part of the side walls of the secondary cavity 22 can be selected to be provided with the acoustic-electric conversion component 3, which is specifically determined according to the actual situation and will not be elaborated here.

[0099] During 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, and then drives the friction layer of the acoustic-electric conversion component 3 to undergo contact-separation motion. During the contact-separation process, the charges in the acoustic-electric conversion component 3 are transferred to form an electric current, thereby realizing the process of converting mechanical energy into electrical energy.

[0100] In this specific embodiment, the acoustic-electric conversion component 3 can convert the energy of the acoustic wave vibration in the secondary cavity 22 of the second-stage 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 sources and lowers the operating cost of the system. Additionally, 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, by attaching the acoustic-electric conversion component 3 to the inner sidewall of the secondary cavity 22, the internal space of the second-stage resonator 2 can be fully utilized, avoiding additional occupation of external space. This compact design makes the entire system more lightweight, compact, and convenient for installation and integration. The integrated design of the acoustic-electric conversion component 3 and the second-stage resonator 2 can simplify the structure of the acoustic-electric conversion device 01, reducing the use of connecting components and external lines. This integrated design not only improves the reliability of the acoustic-electric conversion device 01 but also reduces the failure rate. The acoustic-electric conversion component 3 is usually made of flexible materials and has good mechanical durability and anti-fatigue performance. By setting it on the sidewall of the cavity of the second-stage resonator 2, it can be avoided from being directly exposed to the external environment, thereby extending its service life.

[0101] Based on the above embodiment, the acoustic-electric conversion component 3 can be disposed on the inner sidewall of the secondary cavity 22 opposite to its secondary cavity neck 21; and the acoustic-electric conversion component 3 completely covers the inner sidewall of the secondary cavity 22 where it is located.

[0102] During 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 the acoustic wave. The inner sidewall of the secondary cavity 22 opposite to the secondary cavity neck 21 is directly impacted by the acoustic wave, and the amplitude of the pressure fluctuation is the largest, thereby driving the friction layer of the acoustic-electric conversion component 3 located on the inner sidewall of the secondary cavity 22 opposite to the secondary cavity neck 21 to undergo contact-separation motion. During the contact-separation process, the charges in the acoustic-electric conversion component 3 are transferred to form an electric current, thereby realizing the process of converting mechanical energy into electrical energy.

[0103] It should be noted that static charges are generated on the contact surfaces of two different materials in the acoustic-electric conversion component 3 through the triboelectric effect. The larger the area of the friction layer, the more microscopic contact points participating in charge transfer during contact, and the total charge increases accordingly; in order to further improve the energy conversion efficiency of the acoustic-electric conversion component 3, the acoustic-electric conversion component 3 can completely cover the inner sidewall of the secondary cavity 22 where it is located.

[0104] In this specific embodiment, the beneficial effect of arranging the acoustic-electric conversion component 3 on the inner side wall of the secondary cavity 22 opposite to the neck opening 21 of the secondary cavity is as follows: The side wall opposite to the neck opening is the area with the largest amplitude of acoustic pressure fluctuation in the resonator. At this place, standing wave antinodes are formed due to the superposition of incident and reflected sound waves, resulting in a violent alternating change of periodic high and low pressures. The high-pressure fluctuation drives the friction layer and the electrode layer of the acoustic-electric conversion component 3 to produce a larger amplitude of contact-separation movement, and the charge transfer amount increases significantly, which can effectively increase the power generation efficiency. In addition, at the natural frequency of the resonator, the air column at the neck opening vibrates most violently. The acoustic-electric conversion component 3 can directly couple the resonance energy at this position to achieve the peak value of the electromechanical conversion efficiency. By arranging the acoustic-electric conversion component 3 on the inner side wall of the secondary resonator 2 opposite to the neck opening, the optimal balance between the energy conversion efficiency and the acoustic performance is achieved. This design is particularly suitable for scenarios that need to simultaneously meet noise control and energy self-supply. Its core advantage lies in using the resonance effect to directionally capture high-intensity acoustic energy, and at the same time minimizing the interference to 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, multiple convex structures 13 distributed in an array can be arranged on the inner side wall of the cavity of at least one of the resonators except for the last-stage resonator. The convex structures 13 are used to guide the sound waves to the neck opening of the next-stage resonator and improve the resonance effect of the cavity where the convex structures 13 are located, so as to amplify the acoustic pressure.

[0106] It should be noted that the convex structure 13 in this specific embodiment can be a cylindrical protrusion, and the cylindrical protrusion is an elastic structure; the convex structures 13 are distributed in a rectangular array on the inner side wall of the cavity. As Figure 5 、 Figure 6 shown, the cylindrical protrusions are distributed in a 3*6 rectangular array on the inner side wall of the cavity, and the neck opening for allowing the sound waves to enter the cavity of the next-stage resonator is arranged on the side wall of the cavity where the convex structures 13 are located, and the neck opening is located at the center position of the inner side wall of the cavity where it is located.

[0107] It should be noted that the convex structure 13 in this specific embodiment can be made of elastic silicone material, or can be made of other materials that meet the requirements, which is specifically determined according to the actual situation and will not be elaborated here.

[0108] Here, the convex structure 13 is set as an elastic cylindrical protrusion. A single elastic convex structure 13 can be regarded as a micro-resonance unit. When its natural frequency is coupled with the resonance 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 the extreme acoustic pressure impact and avoid the hard collision between the friction layers of the acoustic-electric conversion component 3.

[0109] In this specific embodiment, the neck opening is arranged at the center of the inner wall of the chamber where it is located, which facilitates the convex structure 13 to guide the sound wave to the position of the neck opening. Additionally, during the processing, it is convenient to process the neck opening and, at the same time, to arrange the convex structure 13.

[0110] In this specific embodiment, by arranging the convex structure 13, the sound wave is forced to undergo multiple reflections and diffractions in the cavity, extending the propagation path of the sound wave in the cavity. Moreover, by arranging the convex structure 13 in the required array, the transmission of the sound wave can be guided so that the sound wave can be smoothly transmitted to the neck opening of the next-stage resonator. In addition, the regularly arranged convex array can break the symmetry of the cavity, excite the high-order resonance mode, 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 for the acoustic-electric conversion component 3.

[0111] In a specific embodiment, the acoustic-electric conversion component 3 is a triboelectric nanogenerator acoustic-electric conversion component. The triboelectric nanogenerator acoustic-electric conversion component includes a first friction layer 31, a second friction layer 32, and a third friction layer 33. The first friction layer 31 is attached to the inner wall of the chamber where the acoustic-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. The vibration of the sound wave drives the first friction layer 31 and the second friction layer 32 to periodically contact and separate to generate an electric current.

[0112] Combined Figure 1 、 Figure 12 As shown, during the actual use process, the sound wave resonance in the chamber where the acoustic-electric conversion component 3 is located drives the acoustic-electric conversion component 3 to vibrate periodically. Under the drive of the sound pressure, the positive electrode material layer and the negative electrode material layer vibrate and contact and separate periodically, generating an alternating current. The specific steps are as follows (as Figure 12 shown, where the shaded part is the positive electrode material layer and the white part is the negative electrode material layer):

[0113] Initial contact state: When contacting, due to the different abilities of the materials to bind electrons, electrons will transfer from the material with weak binding ability to the material with strong binding ability. Electron transfer occurs between the positive and negative electrodes, and electrons in the external circuit flow from the positive electrode material layer to the negative electrode material layer, forming an instantaneous 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. Due to electrostatic induction, the positive electrode material layer induces positive charges, and the negative electrode material layer induces negative charges.

[0116] Second 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 acoustic wave energy of a specific frequency through the structural characteristics of its resonant cavity. This amplified acoustic wave energy can directly act on the friction layer of the acoustic-electric conversion component 3, thereby significantly improving the output power of the acoustic-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-electric conversion component 3, the overall device can still remain compact and is convenient to be integrated into various devices. Moreover, the cavity structure of the resonator can provide stable support for the acoustic-electric conversion component 3 and reduce the influence of external vibration on the acoustic-electric conversion component; this structural stability helps to improve the reliability and durability of the entire device.

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

[0120] It should be noted that when different materials in the acoustic-electric conversion component 3 come into contact, due to the different abilities of atoms to bind electrons, electrons will transfer from the material with weak binding to the material with strong binding, causing static charges to be generated on the material surface. For example, when polytetrafluoroethylene contacts aluminum, electrons will transfer from aluminum to the surface of polytetrafluoroethylene, making polytetrafluoroethylene negatively charged and 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 other materials, which are specifically determined according to the actual situation.

[0121] Copper foil is an excellent conductive material with high electrical conductivity and can efficiently collect and transmit charges; in the acoustic-electric conversion component 3, as the positive electrode material, copper foil can quickly export the charges generated by friction and transmit them to the external circuit, thereby improving the output efficiency of electrical energy. Polydimethylsiloxane is a material with high electronegativity and is prone to adsorbing negative charges during the friction process; its surface can form an effective charge separation with copper foil, thereby realizing efficient charge transfer.

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

[0123] Specifically, the mass 34 can be set to a convex cylindrical structure, and the mass 34 is arranged at a position facing the neck opening of the resonator.

[0124] Here, the mass block 34 is arranged at a position facing the neck of the resonator. The neck of the resonator is a key part for sound energy transmission. The setting of the mass block can better guide the sound energy to the effective working area of the acoustic-electric conversion component, reducing the leakage and loss of sound energy during transmission. Additionally, the presence of the mass block can enhance the acoustic field coupling effect between the vibration of the air column in the resonator and the acoustic-electric conversion component. This enhanced coupling can enable the sound energy to be more effectively converted into mechanical energy and then into electrical energy, improving the sound energy utilization efficiency of the entire device.

[0125] In this specific embodiment, the setting of the mass block 34 can increase the vibration mass of the acoustic-electric conversion component 3 at the neck of the resonator. When acoustic waves vibrate at the neck of the resonator, the mass block 34 will move along with the vibration, thereby enhancing the mechanical response of the acoustic-electric conversion component 3. Additionally, the inertial effect of the mass block 34 can enable the acoustic-electric conversion component 3 to generate a larger vibration amplitude under the action of acoustic waves. This larger vibration amplitude can more effectively drive the contact separation or relative movement of the friction layer in the acoustic-electric conversion component 3, thereby improving the power generation efficiency.

[0126] In a specific embodiment, the acoustic-electric conversion device 01 further includes a current conversion circuit 4. The current conversion circuit 4 is connected to the acoustic-electric conversion component 3, and the current conversion circuit 4 is used to export the current generated by the acoustic-electric conversion component 3 and convert the alternating current into direct current.

[0127] The setting of the current conversion circuit 4 can realize the export of the current generated by the acoustic-electric conversion component 3 and convert the alternating current into direct current for powering other devices.

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

[0129] As Figure 13 shown, multiple rectification branches are provided. Each rectification branch is provided with a rectifier 41, and the rectification branches are arranged in one-to-one correspondence with the acoustic-electric conversion component 3. The current conversion circuit 4 can convert the pulsed electric energy output by the acoustic-electric conversion component 3 into stable direct current to power low-power devices.

[0130] In a specific embodiment, the acoustic-electric conversion device 01 further includes a current monitoring circuit and a controller. The current monitoring circuit is connected to the acoustic-electric conversion component 3 and receives the electrical signal generated by the acoustic-electric conversion component 3. The current monitoring circuit sends the received electrical signal to the controller, and the controller determines the working state of the sound generating device 03 based on the electrical signal.

[0131] The sound generating device 03 in this specific embodiment may be a cooling fan. Through an electrical signal, the rotation speed of the cooling fan or the gear position of the cooling fan can be judged to facilitate real-time understanding of the working state of the cooling fan, so as to adjust the rotation speed or gear position of the cooling fan according to the heat dissipation situation.

[0132] Of course, the sound generating device 03 in this specific embodiment may also be other devices, which are specifically determined according to the actual situation and will not be elaborated here.

[0133] It should be noted that a display device may also be set up to display the real-time working state of the sound generating device 03, so as to facilitate the staff to observe the working state of the sound generating device 03 at any time and make adjustments when the working state of the sound generating device 03 does not meet the requirements; relevant warning devices may also be set up in the display device, and when the working state of the sound generating device 03 does not meet the requirements, the controller controls the warning device to send out relevant warning information.

[0134] The specific structure of the current monitoring circuit in this specific embodiment can be set according to the actual function, which is specifically determined according to the actual situation and will not be elaborated here.

[0135] During actual use, the electro-acoustic conversion device 01 in this specific embodiment can be used to monitor the sound of the sound generating device 03, and the current monitoring circuit sends the received electrical signal to the controller. Since the electrical signals generated under different working conditions are different, the controller can judge the working state of the sound generating device 03 according to the electrical signal, so as to intuitively judge the working state of the sound generating device 03.

[0136] This application also provides a sound absorption device. The sound absorption device includes at least two stages of resonators; each stage of resonator includes a neck and a chamber communicating with the neck. The sound wave enters the chamber communicating with the neck from the neck and excites resonance in the chamber to amplify the sound pressure; on the side wall of the chamber of the upper stage of the adjacent two stages of resonators, there is a neck for communicating with the chamber of the lower stage of the resonator; the orthographic projection of the chamber of the upper stage resonator along the direction perpendicular to any side wall thereof falls within the orthographic projection of the chamber of the lower stage resonator along the direction perpendicular to this side wall.

[0137] During actual use, sound waves enter the chamber of the first-stage resonator through the neck of the first-stage resonator. Sound pressure changes occur at the neck of the first-stage resonator, causing the air in the chamber of the first-stage resonator to start resonating. When the frequency of the incident external sound waves is equal to the natural frequency of the resonator, the air column in the neck vibrates violently due to resonance. The sound waves enter the chamber of the next-stage resonator through the neck of the next-stage resonator from the chamber of the first-stage resonator. Sound pressure changes occur at the neck of the next-stage resonator, causing the air in the chamber of the next-stage resonator to start resonating, until the sound waves enter the chamber of the last-stage resonator. Sound pressure changes occur at the neck of the last-stage resonator, causing the air in the chamber of the last-stage resonator to start resonating. The sound wave energy is converted into the mechanical energy of the vibration of air molecules, which can achieve the effect of noise reduction.

[0138] In this specific embodiment, the sound waves resonate through at least two stages of resonators, which can effectively amplify the sound pressure and improve the utilization rate of sound energy. In addition, at least two stages of resonators can be set to different natural frequencies to cover a wider range of sound wave frequencies and achieve the absorption of sounds with a wider range of frequencies.

[0139] In addition to the above-mentioned sound-electricity conversion device 01, the present application also provides a sound absorption and conversion device 02, which includes a plurality of the above-mentioned sound-electricity conversion devices 01 and a housing. Alternatively, the sound absorption and conversion device 02 includes a plurality of the above-mentioned sound absorption devices and a housing. The housing is used to install the sound-electricity conversion device 01 or is used to install the sound absorption device, and the housing is used to be connected to the sound generating device 03.

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

[0141] During actual use, it is necessary to connect the sound absorption and conversion device 02 in this specific embodiment to the sound generating device 03 and install the sound absorption and conversion device 02 on the sound output 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 and conversion device 02. The sound waves are transmitted in the sound-electricity conversion device 01 and resonate in the chamber of the resonator. The kinetic energy generated during the resonance of the sound waves drives the sound-electricity conversion component 3 to generate electric energy. The electric energy generated by the sound-electricity conversion component 3 can be used to supply power to other electrical devices or the electric energy generated by the sound-electricity conversion component 3 can be stored for emergency plans.

[0142] In this specific embodiment, by providing a sound absorption and conversion device 02, noise reduction of the sound generated by the sound generating device 03 can be achieved, and the sound energy is converted into electrical energy by utilizing the sound energy. The sound absorption and conversion device 02 can provide power support for the sensors, wireless communication modules, etc. integrated therein, realizing self-powered operation.

[0143] Based on the above embodiment, the housing can be set as a cylindrical housing 5, and the acoustic-electric conversion device 01 is arranged on the inner side wall of the cylindrical housing 5. The necks of the first-stage resonators 1 in the acoustic-electric conversion device 01 all face away from the inner side wall of the cylindrical housing 5 where the acoustic-electric conversion device 01 is located.

[0144] Furthermore, a connecting flange 51 can be arranged at the outer wall edge of one end in the axial direction of the cylindrical housing 5. The connecting flange 51 has an extension along the radial direction of the cylindrical housing 5, and the connecting flange 51 is used for connecting with the sound generating device 03, enabling effective connection between the sound absorption and conversion device and the sound generating device 03.

[0145] As Figure 10 shown, 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 Figure 8 、 9 shown, the cylindrical housing 5 is an octagonal cylindrical housing 5, which can be applied to the cooling fan of a server, and the modular layout of the octagonal cylinder takes into account both the noise reduction and power generation functions and space adaptation.

[0146] Of course, the cylindrical housing 5 in this specific embodiment can also be set to other shapes that meet the requirements, which are specifically determined according to the actual situation and will not be elaborated here.

[0147] In this specific embodiment, by setting the housing as the cylindrical housing 5, it can be applied to sound generating devices 03 such as cooling fans, and by arranging the acoustic-electric conversion device 01 on the inner side wall of the cylindrical housing 5, full and reasonable utilization of space can be achieved.

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

[0149] It should be noted that the plate-shaped housing can be directly attached to or embedded in planar structures such as walls, equipment casings, and sound insulation barriers without a complex support system, which is suitable for large-scale industrial installation. It can also be designed as a modular unit, and the coverage area can be expanded by splicing to flexibly cope with noise sources of different sizes. In addition, multiple resonator units can be evenly distributed on the surface of the plate-shaped housing to form a broadband sound absorption array, covering a wider noise frequency range.

[0150] In this specific embodiment, the acoustic-electric units are arranged in a planar manner to form a sound-absorbing and power-generating panel, which can be arranged on the inner surface of the server chassis sheet metal or inside the cabinet as a sound-insulating and sound-absorbing device, or can be distributed in the computer room to recover noise energy.

[0151] The sound absorption and conversion device 02 provided in this specific embodiment can also be installed in the sound insulation barrier of highways or viaducts. By utilizing the large-area sound absorption characteristics of the plate-shaped housing, traffic noise can be absorbed, and at the same time, the acoustic-electric conversion component 3 can supply power to street lamps or surveillance cameras; it can also be integrated into the air conditioner outdoor unit cover or the fresh air system housing to reduce the operating noise of the equipment. Specifically, it is determined according to the actual situation and will not be elaborated here.

[0152] It should be noted that the housing for installing the acoustic-electric conversion device 01 provided in this application can be set as a curved surface housing, a spherical housing, a cube housing, a conical housing, a polyhedron housing, etc. in addition to the cylindrical and plate-shaped ones.

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

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

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

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

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

[0158] In a specific embodiment, the above-mentioned sound absorption and conversion device 02 can be installed in the cooling fan of the server. The natural frequencies of at least two stages of resonators are designed according to 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 electrical energy through the acoustic-electric conversion component 3.

[0159] Of course, the above-mentioned sound absorption and conversion device 02 can also be installed in the mechanical hard disk of the server. The hard disk read / write head seeking and the platter rotation generate low-frequency mechanical vibration noise and high-frequency whistling; the natural frequencies of at least two stages of resonators are designed according to the low-frequency mechanical vibration noise and high-frequency whistling 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 electrical energy through the acoustic-electric conversion component 3.

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

[0161] The above has introduced in detail an acoustic-electric conversion device, a sound absorption device, a sound absorption and conversion device, and a server provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An acoustic-electric conversion device, characterized in that: include: At least two stages of resonators and an acoustic-electric conversion component (3) arranged on the last stage of the resonators; Each stage of the resonator comprises a neck and a chamber connected to the neck, and the side wall of the chamber of the upper stage of the resonator in two adjacent stages is provided with a neck connected to the chamber of the lower stage of the resonator; The orthographic projection of the cavity of the resonator of the previous stage along a direction perpendicular to any side wall thereof falls within the orthographic projection of the cavity of the resonator of the next stage along a direction perpendicular to the side wall.

2. The acoustic-to-electric conversion device according to claim 1, characterized in that: 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 outer side of the first-stage resonator (1) in a circumferential direction.

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 arranged 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) arranged 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) through 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-to-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 one-to-one correspondence with the four side walls of the main cavity (12); the cross-section of the secondary cavity (22) is a trapezoid.

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: The acoustic-to-electric conversion component (3) is disposed on at least one side wall of the secondary cavity (22); the acoustic-to-electric conversion component (3) is disposed on the inner side wall of the secondary cavity (22); The acoustic-electric conversion component (3) is in the form of a sheet and is 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-to-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, characterized in that: Except for the resonator of the last stage, the inner side wall of the chamber of at least one of the remaining resonators is provided with a plurality of convex structures (13) distributed in an array, and the convex structure (13) is used to guide the sound waves to the neck of the resonator of the next stage and to enhance the resonance effect of the chamber where the convex structure (13) is located, so as to amplify the sound pressure.

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

10. The acoustic-to-electric conversion device according to claim 9, 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.

11. The acoustic-to-electric conversion device according to any one of claims 1 to 10, 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); 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, the second friction layer (32) is a negative electrode material layer, and the acoustic wave vibration drives the first friction layer (31) and the second friction layer (32) to periodically contact and separate, thereby generating electric current.

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

13. The acoustic-to-electric conversion device according to any one of claims 1 to 10, characterized in that: A protruding mass block (34) is provided on the side of the side wall of the chamber in which the acoustic-to-electric conversion component (3) is located, and the mass block (34) is located at the center of the surface of the acoustic-to-electric conversion component (3).

14. The acoustic-to-electric conversion device according to any one of claims 1 to 10, characterized in that: It also comprises a current conversion circuit (4), which is connected to the acoustic-electric conversion component (3) and is used to convert the alternating current output by the acoustic-electric conversion component (3) into direct current.

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

16. The acoustic-to-electric conversion device according to any one of claims 1 to 10, characterized in that: It also includes a current monitoring circuit and a controller, wherein the current monitoring circuit is connected to the sound-to-electric conversion component (3) and receives the electrical signal generated by the sound-to-electric conversion component (3), and the current monitoring circuit sends the received electrical signal to the controller, and the controller determines the working state of the sound generating device (03) based on the electrical signal.

17. A sound absorbing device, characterized in that: include: at least two stages of resonators; Each stage of the resonator comprises a neck and a chamber connected to the neck; and the side wall of the chamber of the upper stage of the resonator of two adjacent stages is provided with a neck for connecting with the chamber of the resonator of the lower stage; The orthographic projection of the cavity of the resonator of the previous stage along a direction perpendicular to any side wall thereof falls within the orthographic projection of the cavity of the resonator of the next stage along a direction perpendicular to the side wall.

18. A sound absorption conversion device, characterized in that: The device comprises a plurality of sound-to-electric conversion devices (01) and a shell as described in any one of claims 1 to 16, or the sound absorption conversion device comprises a plurality of sound absorption devices and a shell as described in claim 17; 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).

19. The sound absorption conversion device according to claim 18, 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) faces the side of the inner side wall of the cylindrical shell (5) away from the acoustic-to-electric conversion device (01).

20. The sound absorption conversion device according to claim 19, characterized in that: A connecting flange (51) is provided at 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).

21. The sound absorption conversion device according to claim 18, 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.

22. A server, characterized in that: It comprises the sound absorption conversion device (02) as claimed in any one of claims 18 to 21 and a sound generating device (03) connected to the sound absorption conversion device (02).

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