CN224177105U - Novel ultra-thin broadband sound-absorbing composite structure - Google Patents
Novel ultra-thin broadband sound-absorbing composite structureInfo
- Publication number
- CN224177105U CN224177105U CN202520444879.2U CN202520444879U CN224177105U CN 224177105 U CN224177105 U CN 224177105U CN 202520444879 U CN202520444879 U CN 202520444879U CN 224177105 U CN224177105 U CN 224177105U
- Authority
- CN
- China
- Prior art keywords
- sound
- shell
- composite structure
- plate
- tubular structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Building Environments (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The utility model provides a novel ultrathin broadband sound absorption composite structure which comprises a plurality of silencing units, wherein the silencing units comprise a shell, the silencing units are arranged in a mutual contact mode on the same plane to form a three-dimensional ultrathin broadband sound absorption composite structure, the top plate of the shell is a micro-pore plate, a partition plate and a tubular structure are further arranged in the shell, a cavity is reserved between the partition plate and the bottom plate of the shell, and the tubular structure is connected with the micro-pore plate and the partition plate. The sound wave firstly enters the interior of the silencing unit through the micro-pore plate and the tubular structure on the silencing unit, the sound wave entering the interior of the silencing unit is firstly reduced due to the resonance effect of the micro-pore plate and the viscous effect of the tubular structure, the sound wave entering the interior of the shell encounters the first layer of cavity between the baffle plate and the micro-pore plate and the second layer of cavity between the baffle plate and the bottom plate, and resonates with the two cavities, so that the second sound energy loss is realized, and the sound absorption effect at low, medium and high frequencies is better.
Description
Technical Field
The utility model belongs to the field of noise treatment, and particularly relates to a novel ultrathin broadband sound absorption composite structure.
Background
Noise control technology of the product is an important factor affecting consumer selection and satisfaction. Generally, noise in a small space, such as various electrical appliances like air conditioners, dust collectors, refrigerators, nuclear magnetic medical instruments and the like, and small functional spaces like small transformers and musical instrument rooms, have high requirements on the acoustic performance and appearance structure of noise reduction materials due to small space and compact structure, for example, the noise reduction effect of the noise reduction materials is optimal on the premise of controlling the area and volume, so that the technical problem that the cost of the sound absorption body with small size, low price and good noise reduction effect needs to be solved in the industry is designed.
In the traditional sound absorption and noise reduction materials and structures, the sound absorption materials are most commonly used as sound absorption and noise reduction materials such as glass wool, rock wool and the like, the material has poor molding performance and is easy to collapse, not only the environment is polluted, but also the sound absorption effect is easy to lose, and noise reduction structures such as Helmholtz dampers are taken as typical representatives of the sound absorption and noise reduction structures, researchers develop extensive researches on the acoustic characteristics of the sound absorption and noise reduction structures, the technology of resistant silencers such as Helmholtz dampers and expansion pipe silencers is mature, and when the sound wave is excited by sound waves with a certain specific frequency, energy can be consumed through vibration of a resonant cavity, so that the technology can only control noise with a single specific frequency. It is particularly important to design a novel ultrathin Helmholtz damper structure capable of simultaneously meeting low-frequency and broadband control.
The related art has been filed before this company and has patent number 202411387810.7, but the sound absorption effect of this structure in the low frequency region is relatively weak, so that the sound absorption coefficient of the whole frequency band is affected.
Disclosure of utility model
The utility model aims to solve the technical problem of providing a novel ultrathin broadband sound absorption composite structure which has the advantages of small volume, thin thickness, simpler unit structure, wider sound absorption and noise reduction frequency band and good effect.
The utility model adopts the technical proposal for solving the technical problems that:
The utility model provides a novel ultra-thin broadband sound absorption composite construction, its includes several noise elimination unit, noise elimination unit includes a casing, the novel ultra-thin broadband sound absorption composite construction of the mutual contact arrangement of several noise elimination unit pair by pair on the coplanar, the roof of casing is the microplates, still be provided with a baffle and tubular structure in the casing, the baffle with leave the cavity between the bottom plate of casing, tubular structure connects the microplates with the baffle.
The upper ends of the tubular structures pass through the microplates, and the lower ends of the tubular structures pass through the separator plates.
The distance between the partition plate and the microporous plate is H, the distance between the lower end of the tubular structure and the partition plate is L, the H is 5 mm-35 mm, and the L is 5 mm-17 mm.
The radius of the tubular structure is 2.5 mm-5 mm.
The shell is internally provided with a film, the film is positioned between the partition board and the bottom board of the shell, and a gap is reserved between the film and the bottom board of the shell.
The cross section of the shell is square, round, oval, triangular or polygonal.
The cross section of the novel three-dimensional ultrathin broadband sound absorption composite structure is triangular, square or other polygonal structures.
The cross section of the shell is square, the ultrathin broadband sound absorption composite structure comprises 9 silencing units, and the silencing units are arranged in three rows and three columns.
The radius and length of the tubular structures in adjacent ones of the sound attenuating units are different.
The radius of the tubular structure within the 9 sound attenuating units, the H and the L are (unit mm): (5,30,5); (4,10,15); (2,15,7); (2,20,10); (3.5,35,1); (4.5,25,7); (4.5,20,12); (3.5,20,12); (2.5,5,17) in the order from left to right, respectively.
The sound-damping structure provided by the utility model has the beneficial effects that the miniature sound-damping unit is adopted, sound waves firstly enter the interior of the sound-damping unit through the micro-pore plate and the tubular structure on the sound-damping unit, the sound waves entering the interior of the sound-damping unit are firstly damped due to the resonance action of the micro-pore plate and the viscous action of the tubular structure, the sound waves entering the shell body encounter the first layer cavity between the partition plate and the micro-pore plate and the second layer cavity between the partition plate and the bottom plate, and resonate with the two cavities, so that the second sound energy loss is realized, the noise is further weakened, and the good sound-absorbing effect at low, medium and high frequencies is realized.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present utility model;
FIG. 2 is a schematic view of one of the longitudinal cross-sectional structures of FIG. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a schematic view of the overall structure of the housing;
FIG. 5 is a schematic view of the internal structure of the housing;
Fig. 6 is a schematic view of the sound absorption effect of the preferred embodiment.
Detailed Description
Embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 5, the embodiment of the utility model provides a novel ultra-thin broadband sound absorption composite structure, which comprises a plurality of sound absorption units, wherein the sound absorption units are arranged in a mutual contact mode on the same plane to form a three-dimensional ultra-thin broadband sound absorption composite structure, the sound absorption units can be positioned on the same plane or not, namely, adjacent sound absorption units are staggered up and down, and can be properly adjusted according to practical application scenes, the sound absorption units comprise a shell 1, the shell 1 is made of metal materials or nonmetal materials, the shape of the shell 1 can be hexahedron, cylinder, round table, cylinder-like, triangular column or polygonal column, the cross section of the shell can be square, round, oval, triangle or polygonal correspondingly, and the cross section of the novel three-dimensional ultra-thin broadband sound absorption composite structure formed by arranging a plurality of shells 1 can be triangle, square or other polygonal structures according to the different shapes of the shell.
The height of the shell 1 is selected to be 30-50 mm, preferably 25-45 mm and most preferably 40mm, the top plate of the shell is a micro-pore plate 2, the thickness of the micro-pore plate 2 is selected to be 0.8-1.2 mm, usually 1.0mm, the penetration rate of the micro-pore plate 2 is 2.0-4%, preferably 2.5-3.5%, usually 3.0-3.5%, and the micro-pore diameter is 0.2mm. The shell 1 is internally provided with a partition board 4 and a tubular structure 3, a cavity is reserved between the partition board 4 and the microporous board 2 of the shell, the tubular structure 3 is simultaneously connected with the microporous board 2 and the partition board 4, the upper end and the lower end of the tubular structure 3 simultaneously penetrate through the microporous board 2 and the partition board 4, the tail end of the tubular structure 3 does not expose the microporous board after penetrating through the microporous board 2, the tail end of the tubular structure 3 exposes out of the partition board 4 after penetrating through the partition board 4, in particular, one surface of the microporous board of each shell is placed upwards, the distance between the partition board 4 and the microporous board 2 is H, the distance between the tail end of the lower part of the tubular structure 3 and the partition board 2 is L, the distance between the H and the microporous board 2 is 5 mm-35 mm, the L is 5-17 mm, and the radius of the tubular structure 3 is 2.5 mm-5 mm. In order to further improve the sound absorption coefficient, a film is further arranged in the shell, the film is positioned between the partition board 4 and the bottom plate of the shell 1, a gap is reserved between the film and the bottom plate of the shell, and the structure utilizes micropore resonance noise elimination, slit resonance sound absorption, cavity resonance sound absorption and film resonance sound absorption quadruple sound absorption resonance, so that the sound absorption coefficient is further improved.
Noise sound wave encounters each sound elimination unit in the propagation process, part of sound wave is weakened through resonance of the micro-pore plate 2 on the sound elimination unit, then enters the inside of the shell 1, and the other part of noise sound wave enters the inside of the shell 1 through the tubular structure 3, because the tubular structure 3 has a certain length, the sound wave collides with the pipe wall to generate friction and reflection when passing through the tubular structure 3, the intensity of the sound wave is weakened, the weakened sound wave enters the inside of the shell 1, because a certain cavity is formed between the baffle plate 4 and the bottom plate of the shell 1, resonance is generated together with the vibration of the sound wave due to the vibration of the micro-cavities, so that the effect of weakening noise is achieved, and similarly, if a film is additionally arranged below the baffle plate 4, the vibration is generated together with the vibration of the film encountering the sound wave, so that the resonance is generated together with the vibration of the sound wave, and the noise is weakened. The conversion of acoustic energy is in accordance with the law of conservation of energy, the energy lost is equal to the sum of the total energy minus the energy of reflected and transmitted acoustic energy, and because the silencing unit of the utility model belongs to a single port end resonator, the acoustic wave cannot transmit, so that the transmitted energy is 0, the reflected acoustic wave is consumed again by the micro-porous plate 2 and the tubular structure 3, and finally approaches zero.
As a specific option, as shown in fig. 1, 2 and 4, each novel ultra-thin broadband sound absorption composite structure comprises 9 sound absorption units, the cross section of the shell of each sound absorption unit is in a square structure, the shell is in a square column structure, the 9 sound absorption units are arranged in three rows and three columns on the same plane, the square side length is 10mm, the height of the shell is selected to be 40mm, the height of the three-dimensional ultra-thin broadband sound absorption composite structure is the height of the shell, namely 40mm, the length and the width of the three-dimensional ultra-thin broadband sound absorption composite structure are the sum of the length and the width of the three sound absorption unit shells respectively, the length and the radius of the tubular structure 3 in each sound absorption unit are different, the parameters of each shell are shown in table 1 (H is the distance between the partition plate 4 and the microporous plate 2; R is the radius of the tubular structure 3, L is the distance between the lower end of the tubular structure and the partition plate, and the unit mm), and the structural parameters of the 9 shells are respectively (5,30,5); (2,15,7); (5642); (4.5,25,7); (24); (6224); (62); (83); data are shown in table (5262 mm).
As shown in figure 6, the sound absorption curve of the ultra-thin broadband sound absorption composite structure has sound absorption coefficient of more than 0.85 in the frequency range of 200-2500, and particularly has sound absorption and noise reduction effects far superior to those of other microporous sound absorption structures in the low-frequency region. The ultra-thin broadband sound absorption composite structure is arranged into a whole sound attenuation surface, the sound attenuation surface is light in weight, the thickness of the sound attenuation surface is relatively thin, the ultra-thin broadband sound absorption composite structure can be used for noise reduction in indoor and small spaces, such as small spaces of an audio-visual room, an elevator room, equipment room and the like, does not occupy space, is high in sound absorption coefficient, and has wide application prospect.
The above embodiment is only one of the preferred embodiments of the present utility model, and the ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model should be included in the scope of the present utility model.
TABLE 1 parameters of various sound damping units in novel ultra-thin broadband sound absorption composite structure
| R1 | R2 | R3 | R4 | R5 | R6 | R7 | R8 | R9 |
| 5 | 4 | 2 | 2 | 3.5 | 4.5 | 4.5 | 3.5 | 2.5 |
| H1 | H2 | H3 | H4 | H5 | H6 | H7 | H8 | H9 |
| 30 | 10 | 15 | 20 | 35 | 25 | 20 | 20 | 5 |
| L1 | L2 | L3 | L4 | L5 | L6 | L7 | L8 | L9 |
| 5 | 15 | 7 | 10 | 1 | 7 | 12 | 12 | 17 |
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202520444879.2U CN224177105U (en) | 2025-03-14 | 2025-03-14 | Novel ultra-thin broadband sound-absorbing composite structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202520444879.2U CN224177105U (en) | 2025-03-14 | 2025-03-14 | Novel ultra-thin broadband sound-absorbing composite structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN224177105U true CN224177105U (en) | 2026-04-28 |
Family
ID=99535461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202520444879.2U Active CN224177105U (en) | 2025-03-14 | 2025-03-14 | Novel ultra-thin broadband sound-absorbing composite structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN224177105U (en) |
-
2025
- 2025-03-14 CN CN202520444879.2U patent/CN224177105U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102087852B (en) | Acoustic resonator and sound chamber | |
| CN115083376B (en) | A low-frequency, broadband, thin-layer sound-absorbing device and noise reduction method | |
| CN207993473U (en) | A kind of micropunch complex muffler | |
| CN111926933B (en) | Frequency-adjustable sound absorption plate based on Helmholtz resonator | |
| CN209875570U (en) | Noise reduction device and gas water heater | |
| CN112927669A (en) | Multi-frequency sound absorption type acoustic superstructure | |
| CN113096626A (en) | Silent box | |
| CN113654232B (en) | A sound-absorbing structure suitable for air outlets of heating and ventilation systems | |
| CN116733787B (en) | A three-dimensional composite metamorphic muffler module and muffler | |
| CN111503410A (en) | Helmholtz type silencer | |
| CN208184916U (en) | A kind of piston compressor | |
| WO2022001831A1 (en) | Silencing unit, and honeycomb muffler | |
| CN109346050A (en) | A wide and low frequency acoustic absorber with folded space | |
| CN207989401U (en) | External impedance composite muffler in one kind | |
| CN213733770U (en) | Sound absorption and insulation integrated honeycomb plate with built-in expansion chamber | |
| CN102384571A (en) | Silencing structure of air-conditioning compressor | |
| CN211451171U (en) | Integral air conditioner | |
| CN223462005U (en) | Ultra-thin broadband sound absorption composite structure | |
| CN115711440B (en) | A bellows noise reduction device for fresh air cabinet and its use method | |
| CN115717567B (en) | Silencing device for gas turbine intake system | |
| CN215949958U (en) | Crescent array type silencer | |
| CN121811837A (en) | Built-in micro-pore plate sound absorption cavity structure | |
| CN116825063A (en) | Acoustic metamaterial large-area short-channel broadband ventilation sound insulator and barrier | |
| CN210947260U (en) | A light wood structure exterior wall with low frequency noise reduction and sound absorption | |
| CN121811835A (en) | Ultra-thin broadband sound absorption composite structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |