CN218351120U

CN218351120U - Sound absorbing device

Info

Publication number: CN218351120U
Application number: CN202222392480.3U
Authority: CN
Inventors: 刘敬华; 李芬芬
Original assignee: Guangdong Liyin Acoustics Technology Co ltd
Current assignee: Guangdong Liyin Acoustics Technology Co ltd
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2023-01-20
Anticipated expiration: 2032-09-06

Abstract

The utility model discloses a sound absorbing device, which comprises a shell, a sound absorbing main body and a sound transmitting piece; the shell is provided with an accommodating groove with an opening at one end, the sound absorption main body is arranged at one end of the shell close to the opening, and the shell and the sound absorption main body are matched to form a resonant cavity; a first sound transmission hole is formed at one side of the sound absorption main body, which is close to the resonant cavity; the resonant cavity is internally provided with a sound transmission piece connected with the sound absorption main body, the sound transmission piece is of a cylindrical structure and is provided with a first sound hole and a second sound hole, the first sound hole is communicated with the first sound hole of the sound absorption main body, the second sound hole is communicated with the resonant cavity, and the wall of the sound transmission piece is obliquely arranged relative to the central line of the first sound hole. This technical scheme who inhales the sound device and provide all forms good inhaling the sound to well high frequency sound and low frequency sound, reaches the effect of wide band sound absorption, and can form module mounting structure, easy dismounting, occupation space is little.

Description

Sound absorbing device

Technical Field

The utility model belongs to the technical field of building material, concretely relates to sound absorbing device and application method thereof.

Background

In various acoustic places such as recording rooms, control rooms, audio-visual rooms, home theaters and the like with high requirements on sound insulation, the sound-absorbing body is used as a good sound-absorbing decorative material and is generally suitable for wallboards, ceiling boards and the like in the acoustic places. The existing sound absorption body has the advantages of single structure, large volume, low sound absorption coefficient and narrow sound absorption frequency, for example, most sound absorption body materials on the market adopt polyester fiber sound absorption plates, the polyester fiber sound absorption plates are decorative materials which are made of polyester fibers through hot press molding and have the sound absorption function, and the polyester fiber sound absorption plates are widely applied to indoor sound absorption design due to the characteristics of changeable colors and changeable shapes. However, although the conventional polyester fiber sound-absorbing board has good processing effect on middle and high frequency sounds, the sound-absorbing effect on low frequency sounds is poor, and particularly, the low frequency sounds below 200Hz are difficult to be absorbed, and the effect of broadband sound absorption is difficult to be achieved. In addition, other sound-absorbing boards on the market generally can only absorb high-frequency, medium-frequency or low-frequency noise singly, cannot absorb noise of various frequencies simultaneously, and are difficult to achieve the effect of broadband sound absorption.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a sound absorbing device all has good sound absorbing effect to well high frequency sound and low frequency sound, can reach the effect of wide band sound absorption.

The technical scheme for achieving the purpose comprises the following steps.

A sound absorbing device includes a casing, a sound absorbing main body, and a sound transmitting member;

the shell is provided with an accommodating groove with an opening at one end, the sound-absorbing main body is arranged at one end of the shell close to the opening, and the shell and the sound-absorbing main body are matched to form a resonant cavity; a first sound transmission hole is formed at one side of the sound absorption main body, which is close to the resonant cavity;

the resonant cavity is internally provided with a sound-absorbing body connected with the sound-transmitting piece, the sound-transmitting piece is of a cylindrical structure and is provided with a first sound hole and a second sound hole, the first sound hole is communicated with the first sound hole of the sound-absorbing body, the second sound hole is communicated with the resonant cavity, and the cylindrical wall of the sound-transmitting piece is opposite to the central line of the first sound hole in an inclined mode.

In some of these embodiments, the sound-transmitting member includes first sound-transmitting portion and second sound-transmitting portion, first sound-transmitting portion is the tubular structure that vertically runs through, the top of first sound-transmitting portion has first sound hole, first sound-transmitting portion with inhale the sound main part and be connected, second sound-transmitting portion is toper tubular structure, just the awl point portion of second sound-transmitting portion peg graft in the bottom of first sound-transmitting portion, the one end that second sound-transmitting portion kept away from the awl point portion with the inner wall of casing offsets, first sound-transmitting portion with the respective lateral wall of second sound-transmitting portion all has a plurality ofly the second sound hole.

In some of these embodiments, the first sound-transmitting portion has an inverted truncated cone-shaped configuration.

In some of these embodiments, the second sound-transmitting portion has a second sound-transmitting hole with an aperture larger than that of the second sound-transmitting portion; the aperture range of the second sound hole of the first sound transmission part is 1 mm-4 mm, and the aperture range of the second sound hole of the second sound transmission part is 0.5 mm-2 mm.

In some embodiments, the first sound transmissive portion sidewall has an aperture ratio greater than an aperture ratio of the second sound transmissive portion sidewall, the first sound transmissive portion sidewall has an aperture ratio in a range of 30% to 50%, and the second sound transmissive portion sidewall has an aperture ratio in a range of 0.5% to 5%.

In some embodiments, a plurality of the sound-transmitting members are provided, and each sound-transmitting member is arranged in an array structure in the resonant cavity.

In some of these embodiments, inhale the sound main part including the face apron that sets gradually, inhale the sound paper, inhale the sound cotton, the resonance is inhaled the sound body and is resonated the rete, resonance has seted up on the rete the first sound hole of passing through, pass through the sound spare with resonance is connected, a plurality of and the second sound hole of passing through that inhale the sound paper intercommunication is seted up on the face apron.

In some embodiments, the resonance sound absorbing body is provided with a plurality of resonance holes, each resonance hole is arranged in an array to form a honeycomb hole structure, and the resonance holes are regular hexagonal hole structures.

In some embodiments, the casing is provided with a plurality of third sound-transmitting holes along a circumferential direction thereof, corresponding to the side wall of the resonant cavity, and the third sound-transmitting holes are covered with covering sound-absorbing bodies.

In some embodiments, the casing includes a bottom plate, four side plates, and a clamping plate, the four side plates are vertically disposed on the bottom plate, the side plates and the bottom plate cooperate to enclose the accommodating groove with an open top, the clamping plate is disposed on inner walls of the side plates and cooperates with the side plates to form a step, and the sound-absorbing body is disposed on the step to separate the accommodating groove into the resonant cavity.

The utility model provides a technical scheme has following advantage and effect:

this inhale sound device sets up in the casing and is close to open-ended one end through inhaling the sound main part, inhale the sound main part on the one hand and can absorb most sound, make the sound energy carry out preliminary decay, on the other hand casing forms the resonant cavity with inhaling the cooperation of sound main part, through be provided with in the resonant cavity with inhale the sound penetrating piece that the sound main part is connected, sound through preliminary decay gets into the sound penetrating piece through the first sound penetrating hole of this sound main part, because the central line slope setting of the relative first sound penetrating hole of lateral wall of sound penetrating piece, the sound that can make to get into the sound penetrating piece is in the sound penetrating piece scattered reflection and is carried out the decay of secondary sound energy, sound after the decay of secondary sound energy gets into the resonance intracavity through the second sound hole of sound penetrating piece and carries out resonance sound absorption, turn into the kinetic energy of resonance membrane with the sound energy, absorb the sound surplus absorption with the low frequency, consequently, this inhale sound device and all form good inhaling the sound of well high frequency sound, reach the effect of wide band sound absorption, and can form module mounting structure, and convenient dismounting, and small occupied space.

Drawings

Fig. 1 is a schematic front view of a sound absorbing device according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view of a part of the sound-absorbing device of FIG. 1;

FIG. 3 is a schematic longitudinal sectional view of the sound absorbing device of FIG. 1;

FIG. 4 is a schematic structural view of the acoustically transparent member of FIG. 2;

fig. 5 is a schematic structural view of the resonance sound absorber of fig. 2.

Description of reference numerals:

100. a sound absorbing device;

1. a housing; 11. a resonant cavity; 12. a third sound-transmitting aperture; 13. a base plate; 14. a side plate; 15. clamping a plate; 2. a sound-absorbing main body; 21. a first sound-transmitting aperture; 22. a face cover plate; 23. sound absorbing paper; 24. sound-absorbing cotton; 25. a resonance sound absorbing body; 251. a resonant hole; 26. a resonant film layer; 3. an acoustically transparent member; 31. a first sound hole; 32. A second sound hole; 33. a first sound transmitting portion; 34. a second sound-transmitting portion.

Detailed Description

In order to facilitate an understanding of the invention, specific embodiments thereof will be described in more detail below with reference to the accompanying drawings.

As used herein, unless otherwise specified or defined, "first, second …" are used merely to distinguish between names, and do not denote a particular quantity or order.

As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, unless specified or otherwise defined.

It should be noted that "fixed" and "connected" in this document may be directly fixed or connected to one element or may be indirectly fixed or connected to one element.

The utility model provides an inhale sound device 100, specifically, should inhale sound device 100 can install on the installation carrier like big theater, concert hall, movie theater, recording studio, monitor room, conference room, gymnasium, exhibition hall, dance hall, KTV package room, family movie & TV hall mill, silence room, court, report room, the wall in acoustics places such as inquest room, ceiling etc. position.

As shown in fig. 1 to 5, the sound absorbing device 100 includes a casing 1, a sound absorbing body 2, and a sound transmitting member 3. The shell 1 is provided with an accommodating groove with an opening at one end, the sound absorption main body 2 is arranged at one end of the shell 1 close to the opening, and the shell 1 and the sound absorption main body 2 are matched to form a resonant cavity 11; the sound-absorbing body 2 is formed with a first sound-transmitting hole 21 on a side thereof adjacent to the resonance chamber 11. Wherein the sound-absorbing body 2 is capable of absorbing most of the medium and high frequency sound, the low frequency sound entering the sound-transmitting member 3 within the resonance chamber 11 through the first sound-transmitting opening 21. Specifically, the sound-transmitting member 3 connected to the sound-absorbing main body 2 is disposed in the resonant cavity 11, the sound-transmitting member 3 is in a cylindrical structure, the sound-transmitting member 3 has a first sound hole 31 and a second sound hole 32, the first sound hole 31 is communicated with the first sound hole 21 of the sound-absorbing main body 2, the second sound hole 32 is communicated with the resonant cavity 11, and a side wall of the sound-transmitting member 3 is disposed in an inclined manner with respect to a center line of the first sound hole 21.

When this inhale sound device 100 and install in the installation carrier, specifically can hang the dress on the installation carrier through casing 1, outer hanging module installation structure, easy dismounting need not to inhale the sound body like the tradition and need reserve a large amount of back spatial structure, can save a large amount of spaces for the installation. Casing 1 is kept away from and is inhaled one end of sound main part 2 and installation carrier laminating setting, inhale sound main part 2 and face indoor promptly, sound is inhaled at first through inhaling sound main part 2 to the sound of propagation coming, inhale sound main part 2 and can absorb most sound in order to carry out preliminary decay to the acoustic energy, sound after preliminary decay includes the well high frequency sound of subtotal most low frequency sound, sound after preliminary decay passes through this first sound-transmitting hole 21 and gets into sound-transmitting member 3, because the central line slope setting of the relative first sound-transmitting hole 21 of section of thick bamboo wall of sound-transmitting member 3, can make the sound that gets into sound-transmitting member 3 carry out the secondary acoustic energy decay at sound-transmitting member 3 internal scattered reflection, sound after the decay again gets into resonant cavity 11 through sound-transmitting member 3's second sound hole 32 and carries out resonance sound absorption and turns into the kinetic energy of sound energy resonance membrane, absorb the sound energy surplus, thereby reach the effect of low frequency sound absorption.

In summary, the sound-absorbing device 100 is disposed at one end of the casing 1 close to the opening through the sound-absorbing main body 2, on one hand, the sound-absorbing main body 2 can absorb most of sound, so that sound energy is primarily attenuated, on the other hand, the casing 1 and the sound-absorbing main body 2 cooperate to form the resonant cavity 11, through the sound-transmitting member 3 connected to the sound-absorbing main body 2 disposed in the resonant cavity 11, sound after primary attenuation enters the sound-transmitting member 3 through the first sound-transmitting hole 21 of the sound-absorbing main body 2, because the sidewall of the sound-transmitting member 3 is disposed obliquely relative to the center line of the first sound-transmitting hole 21, sound entering the sound-transmitting member 3 is scattered and reflected in the sound-transmitting member 3 to perform secondary sound energy attenuation, sound after secondary sound energy attenuation enters the resonant cavity 11 through the second sound-transmitting hole 32 of the sound-transmitting member 3 to perform resonance sound absorption, sound energy is converted into kinetic energy of a resonance film, so as to absorb residual sound energy, thereby achieving a low-frequency sound-absorbing effect, therefore, the sound-absorbing device 100 can achieve a good sound-absorbing effect for both medium-high-frequency sound and low-frequency sound, and form a module installation structure, and is convenient to assemble and occupies a small space.

In some embodiments, as shown in fig. 3 and 4, the sound-transmitting member 3 includes a first sound-transmitting portion 33 and a second sound-transmitting portion 34, the first sound-transmitting portion 33 is a vertically penetrating cylindrical structure, a top end of the first sound-transmitting portion 33 has a first sound hole 31, the first sound-transmitting portion 33 is connected to the sound-absorbing main body 2, the second sound-transmitting portion 34 is a tapered cylindrical structure, a tapered end portion of the second sound-transmitting portion 34 is inserted into a bottom end of the first sound-transmitting portion 33, an end of the second sound-transmitting portion 34 away from the tapered end portion abuts against an inner wall of the casing 1, and respective side walls of the first sound-transmitting portion 33 and the second sound-transmitting portion 34 each have a plurality of second sound holes 32. Understandably, through the cooperation of the first sound transmission part 33 and the second sound transmission part 34, the contact area can be increased when sound enters the sound transmission member 3, and a plurality of channels with gradually reduced space are formed in the first sound transmission part 33, and the second sound transmission part 34 is also a channel with an inclined peripheral surface, so that the diffuse reflection effect on sound is realized after the sound enters, and sound energy can further and effectively attenuate and then enter the resonant cavity 11 for resonance silencing.

In some embodiments, as shown in fig. 4, the first sound-transmitting portion 33 has an inverted truncated-cone-shaped structure, and the first sound-transmitting portion 33 having the inverted truncated-cone-shaped structure enables the peripheral wall of the first sound-transmitting portion 33 to be disposed in an inclined manner and gradually form a tightened spatial structure, so that the inclined peripheral surface of the first sound-transmitting portion 33 can achieve a diffuse reflection effect on sound, so that the sound can be scattered and reflected after entering the first sound-transmitting portion 33, and a good sound energy attenuation effect can be achieved.

In some embodiments, the second sound hole 32 of the first sound-transmitting portion 33 has an aperture larger than that of the second sound hole 32 of the second sound-transmitting portion 34. And/or the side wall of the first sound-transmitting portion 33 has a larger opening ratio than the side wall of the second sound-transmitting portion 34. Through the cooperation of the different apertures of first portion 33 and second portion 34 that passes through to and the cooperation of different aperture ratios, can make first portion 33 and the second portion 34 that passes through to form different acoustic resistances, further increase the acoustic energy loss, in order to reach the better effect of sound absorption.

Preferably, the thickness of the first sound-transmitting portion 33 is 0.3 to 1.0mm, and the aperture of the second sound hole 32 of the first sound-transmitting portion 33 is in the range of 1mm to 4mm, and may be, for example, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, or the like; the center-to-center distance between two adjacent second sound holes 32 of the first sound transmitting portion 33 is 2mm to 8mm, and specifically, the center-to-center distance is a distance between a center of one second sound hole 32 and a center of the other second sound hole 32 of the two adjacent second sound holes 32. The aperture ratio of the side wall of the first sound-transmitting portion 33 may be in the range of 30% to 50%, for example, 30%, 35%, 40%, 45%, 50%, or the like. The thickness of the second sound-transmitting portion 34 is 0.3 to 1.0mm; the second sound holes 32 of the second sound-transmitting portion 34 may have an aperture diameter in a range of 0.5mm to 2mm, for example, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, etc., the center-to-center distance between two adjacent second sound holes 32 of the second sound-transmitting portion 34 may be in a range of 5mm to 15mm, and the side wall of the second sound-transmitting portion 34 may have an aperture ratio in a range of 0.5% to 5%, for example, 0.5%, 1%, 2%, 3%, 4%, 5%, etc. Through a large number of tests, the sound-absorbing member is manufactured according to the sound hole data, so that the sound-absorbing performance of the sound-transmitting member 3 is more excellent.

In some embodiments, as shown in fig. 3 and 4, the acoustically transparent members 3 are provided in a plurality, and the acoustically transparent members 3 are arranged in an array structure within the resonant cavity 11. A plurality of sound-transmitting members 3 cooperate to be able to introduce the sound that is preliminarily attenuated from the sound-absorbing main body 2 into the sound-transmitting member 3 to perform secondary sound energy attenuation and then enter the resonant cavity 11 to perform resonance sound absorption, thereby further improving the sound-absorbing effect.

In some embodiments, the depth of the resonant cavity 11 occupies 1/2 to 3/4 of the height of the housing 1, and the resonant cavity 11 in this range has sufficient depth and space for resonance sound absorption to convert the sound energy into the kinetic energy of the resonance membrane, so as to maximize the absorption of the sound energy margin, thereby achieving excellent low-frequency sound absorption effect.

In some embodiments, as shown in fig. 2 and 4, the sound-absorbing main body 2 includes a surface cover plate 22, sound-absorbing paper 23, sound-absorbing cotton 24, resonance sound-absorbing body 25, and resonance film layer 26, which are sequentially disposed, the resonance film layer 26 is opened with a first sound-transmitting hole 21, the sound-transmitting member 3 is connected to the resonance film layer 26, and the surface cover plate 22 is opened with a plurality of second sound-transmitting holes communicating with the sound-absorbing paper 23.

As described above, specifically, the second sound-transmitting holes are formed in the surface cover plate 22, so that sound can enter the sound-absorbing body to be absorbed, wherein the surface cover plate 22 is an aluminum hole plate, the thickness range is 0.5mm to 5mm, the aperture ratio range is 15% to 30%, the surface cover plate 22 can effectively penetrate sound, and has good bending resistance and pressure resistance, and is lighter. More specifically, this face apron 22 closes board and side bounding wall including the lid, and the side bounding wall is vertical to be set up in the cover body's bottom and to form the cover body structure of bottom open-ended, and this face apron 22 covers and establishes casing 1 in order to form packaging structure with casing 1 cooperation, protects other sound absorbing structure inside. The sound absorbing paper 23 is SoundTEX sound absorbing paper which can absorb medium and high frequency sounds as low as about 1000Hz when sound passes through the SoundTEX sound absorbing paper, the sound absorbing cotton 24 has a thickness ranging from 20mm to 40mm and a density ranging from 50K to 80K, and can absorb sounds as low as about 500Hz when sound passes through the sound absorbing cotton 24. Therefore, the composite structure formed by the combination of the cover sheet 22, the sound absorbing paper 23, and the sound absorbing cotton 24 can absorb middle and high frequency sounds well. The resonance sound-absorbing body 25 and the resonance film layer 26 are matched to form a composite structure, so that medium and low frequency sound can be absorbed, and sound as low as about 250Hz can be absorbed. The sound as low as 125Hz can be absorbed by the sound-transmitting member 3 and the resonant cavity 11, so that the sound-absorbing device 100 can absorb sound of wide frequency of 125Hz to 4000Hz, and achieve broadband sound absorption effect by providing different sound-transmitting materials in the housing 1 to form a composite sound-absorbing structure to absorb sound of various frequencies.

In some embodiments, as shown in fig. 4 and 5, the resonance sound absorption body 25 is provided with a plurality of resonance holes 251, the resonance holes 251 are arranged in an array to form a honeycomb structure, and the resonance holes 251 are regular hexagonal hole structures. The hexagonal resonance holes 251 of the resonance sound-absorbing body 25 can generate a good viscous effect on the incident sound in the resonance of the cavity in the hole, thereby effectively absorbing the middle and low frequency sound. In other embodiments, the shape of the resonant hole 251 is not limited to a regular hexagonal structure, and other suitable shapes of holes may be applied. The thickness of the resonance sound-absorbing body 25 is 20 mm-30 mm, the wall thickness between two adjacent resonance holes 251 is 0.2 mm-0.8 mm, the aperture of the resonance hole 251 is 15 mm-20 mm, and the resonance sound-absorbing body 25 in the numerical range can generate better viscous effect on incident sound in the resonance of the inner cavity of the hole, so that the sound-absorbing effect is further improved.

In some embodiments, as shown in fig. 2, the casing 1 is opened with a plurality of third sound-transmitting holes 12 communicating with the resonant cavity 11 along the circumferential direction thereof corresponding to the side wall of the resonant cavity 11, and each of the third sound-transmitting holes 12 is covered with a covering sound-absorbing body, wherein the covering sound-absorbing body may be SoundTEX sound-absorbing paper. Can communicate each other through this third sound-transmitting hole 12 when a plurality of sound device 100 combinations of inhaling are assembled, increase the propagation path of low frequency sound, can improve sound absorption effect, wherein this third sound-transmitting hole 12 is the circular port, aligns the setting when being convenient for the combination is assembled. Further, this casing 1 is the regular cuboid structure, specifically is the cuboid structure in this embodiment, and casing 1's top surface is the square to make things convenient for a plurality of combinations of inhaling sound device 100 to assemble, effectively avoid the condition that the concatenation department has the gap.

In some embodiments, the housing 1 is an aluminum shell with a thickness of 1mm to 3mm, which enables the sound-absorbing device 100 to be more resistant to bending and compression and lighter, and the sound-absorbing device 100 can maintain good flatness over a larger area.

In some embodiments, as shown in fig. 3, the casing 1 includes a bottom plate 13, a clamping plate 15 and four side plates 14, the four side plates 14 are vertically disposed on the bottom plate 13, the side plates 14 and the bottom plate 13 cooperate to form an accommodating groove with an open top, the clamping plate 15 is disposed on an inner wall of the side plates 14 and cooperates with the side plates 14 to form a step, and the sound-absorbing body 2 is disposed on the step to separate the accommodating groove from the resonant cavity 11. Enclose sound main part 2 through casing 1 and establish, can make the erection joint of inhaling each layer body structure of sound main part 2 more stable, avoid shifting. In addition, the bottom plate 13 and the side plates 14 cooperate to form a box-type structure, which is assembled in a manner that facilitates production, installation, maintenance and replacement, the sound-absorbing material can be widely used for sound-building treatment in large areas or small spaces, can be installed in an external hanging mode, does not need a thick back space structure, and can play a good sound-absorbing effect. And form the step through cardboard 15 and curb plate 14 cooperation, will inhale sound main part 2 and place on the step and can make the installation inslot separate and form out resonant cavity 11, simple structure, simple to operate.

In some embodiments, as shown in fig. 3, the clamping plate 15 is an L-shaped plate structure, and the clamping plate 15 includes a horizontal plate and a vertical plate connected to the horizontal plate, the vertical plate is connected to the side plates 14, and a step is formed between the horizontal plate and the side plates 14 for bearing the sound-absorbing main body 2.

The above examples are not intended to be exhaustive list of the present invention, and there may be many other embodiments not listed. Any replacement and improvement made on the basis of not violating the conception of the utility model belong to the protection scope of the utility model.

Claims

1. The sound absorbing device is characterized by comprising a shell, a sound absorbing main body and a sound transmitting piece;

2. The sound-absorbing device as claimed in claim 1, wherein the sound-transmitting member includes a first sound-transmitting portion and a second sound-transmitting portion, the first sound-transmitting portion has a vertically penetrating tubular structure, the first sound hole is formed at a top end of the first sound-transmitting portion, the first sound-transmitting portion is connected to the sound-absorbing main body, the second sound-transmitting portion has a tapered tubular structure, a tapered portion of the second sound-transmitting portion is inserted into a bottom end of the first sound-transmitting portion, an end of the second sound-transmitting portion, which is away from the tapered portion, abuts against an inner wall of the housing, and a plurality of second sound holes are formed in respective side walls of the first sound-transmitting portion and the second sound-transmitting portion.

3. The sound absorbing device of claim 2, wherein the first sound transmitting portion has an inverted truncated cone-shaped configuration.

4. The sound absorbing device according to claim 2, wherein the second sound hole of the first sound transmitting portion has a larger aperture than the second sound hole of the second sound transmitting portion; the aperture range of the second sound hole of the first sound transmission part is 1 mm-4 mm, and the aperture range of the second sound hole of the second sound transmission part is 0.5 mm-2 mm.

5. The sound absorbing device of claim 2, wherein the first sound transmitting member side wall has an aperture ratio greater than the aperture ratio of the second sound transmitting member side wall, the aperture ratio of the first sound transmitting member side wall is in the range of 30% to 50%, and the aperture ratio of the second sound transmitting member side wall is in the range of 0.5% to 5%.

6. The sound absorbing unit of claim 1, wherein there are a plurality of the acoustically transparent members, and each of the acoustically transparent members is arranged in an array configuration within the resonant cavity.

7. The sound-absorbing device as claimed in any one of claims 1 to 6, wherein the sound-absorbing body includes a surface cover plate, sound-absorbing paper, sound-absorbing cotton, a resonance sound-absorbing body, and a resonance film layer, the resonance film layer being provided with the first sound-transmitting holes, the sound-transmitting member being connected to the resonance film layer, and the surface cover plate being provided with a plurality of second sound-transmitting holes communicating with the sound-absorbing paper.

8. The sound absorbing device as claimed in claim 7, wherein the resonance sound absorbing body is formed with a plurality of resonance holes, each of the resonance holes is arranged in a honeycomb structure, and the resonance holes are regular hexagonal hole structures.

9. The sound absorbing device as claimed in any one of claims 1 to 6, wherein the housing is provided with a plurality of third sound-transmitting holes corresponding to the side wall of the resonant cavity along the circumferential direction thereof, and each of the third sound-transmitting holes is covered with a covering sound-absorbing body.

10. The sound-absorbing device of any one of claims 1 to 6, wherein the housing includes a bottom plate, four side plates and a catch plate, the four side plates are vertically disposed on the bottom plate, the side plates and the bottom plate cooperate to enclose the receiving groove with an open top, the catch plate is disposed on an inner wall of the side plates and cooperates with the side plates to form a step, and the sound-absorbing body is disposed on the step to separate the receiving groove into the resonance cavities.