CN109243419B - Ventilating sound insulation structure based on acoustic metamaterial technology - Google Patents
Ventilating sound insulation structure based on acoustic metamaterial technology Download PDFInfo
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- CN109243419B CN109243419B CN201811265734.7A CN201811265734A CN109243419B CN 109243419 B CN109243419 B CN 109243419B CN 201811265734 A CN201811265734 A CN 201811265734A CN 109243419 B CN109243419 B CN 109243419B
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- 238000009413 insulation Methods 0.000 title claims abstract description 40
- 238000005516 engineering process Methods 0.000 title description 12
- 238000009423 ventilation Methods 0.000 claims abstract description 35
- 239000012792 core layer Substances 0.000 claims abstract description 25
- 238000005452 bending Methods 0.000 claims description 44
- 238000004378 air conditioning Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000001413 cellular effect Effects 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 claims 2
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 230000003628 erosive effect Effects 0.000 abstract 1
- 238000005192 partition Methods 0.000 description 19
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009970 fire resistant effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Building Environments (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The present disclosure proposes a ventilation sound insulation structure, comprising: a cell or a plurality of cells (1) arranged periodically; wherein the cell comprises: a first panel (10) having a first opening (101) at the center thereof; a second panel (20) which is arranged opposite to the first panel, and is provided with a second opening at the center thereof and is opposite to the first opening; and a core layer (30) between the first and second panels having a plurality of acoustic cavity flow channels (301) in communication with the first and second openings. The ventilation and sound insulation structure can inhibit air flow noise in a wide frequency range and has the characteristics of light weight, high temperature resistance, fire resistance, steam erosion resistance and impact corrosion resistance.
Description
Technical Field
The disclosure relates to the technical field of ventilation and sound insulation, in particular to a ventilation and sound insulation structure based on an acoustic metamaterial technology.
Background
With the development of industry and scientific technology, power machinery and electronic equipment are increasingly used. However, mechanical devices are accompanied by noise, and the requirement of mechanical design on ventilation limits the effect of sound insulation measures, and the traditional ventilation structure hardly insulates sound. Cabin noise control is increasingly emphasized, and with the application of new cabin control technology, noise of cabin cooling ventilation equipment and large air return openings becomes one of important sources for influencing cabin noise. Because of the ventilation and heat dissipation requirements, the traditional sound insulation structure/material cannot effectively play a role, so that noise generated in the operation process is almost completely leaked. How to combine sound insulation and ventilation becomes a challenge for ventilation and sound insulation design.
Disclosure of Invention
First, the technical problem to be solved
The disclosure provides a ventilation and sound insulation structure based on an acoustic metamaterial technology, so as to at least partially solve the technical problems.
(II) technical scheme
According to one aspect of the present disclosure, there is provided a ventilation and sound insulation structure including: a single cell or a plurality of cells arranged periodically; wherein the cell comprises:
a first panel with a first opening at the center;
the second panel is arranged opposite to the first panel, and a second opening is arranged at the center of the second panel and opposite to the first opening; a kind of electronic device with high-pressure air-conditioning system
And the core layer is positioned between the first panel and the second panel and is provided with a plurality of acoustic cavity flow passages which are communicated with the first opening and the second opening.
In some embodiments, the core includes a frame, and a plurality of baffle units within the frame, each baffle unit including a plurality of baffles of different lengths, a plurality of curved, different length of the acoustic chamber flow channels being formed between adjacent baffles, and between a baffle and the frame.
In some embodiments, the frame includes four side plates, including a first side plate, a second side plate, a third side plate, and a fourth side plate, which are sequentially connected end to form a rectangular shape;
the core layer comprises a frame and two or four baffle units positioned in the frame, wherein each baffle unit comprises a flat plate and three bent plates.
In some embodiments, the core layer includes two separator units, a first separator unit and a second separator unit, one end of the plurality of separators of the first separator unit is connected to the first side plate, and one end of the plurality of separators of the second separator unit is connected to the third side plate; the other ends of the plurality of separators of the first separator unit are opposite to the other ends of the plurality of separators of the second separator unit.
In some embodiments, each of the curved plates includes a first extension, a second extension, and a connection portion having one end connected to the first extension and the other end connected to the second extension;
the flat plate, the first extending part and the second extending part of the bending plate extend along the direction parallel to the second side plate and the fourth side plate, the connecting part of the bending plate extends along the direction parallel to the first side plate and the third side plate, and each bending plate is connected with the side plate through the first extending part.
In some embodiments, the first extension of each of the curved plates of the first baffle unit is located in a region between the flat plate of the first baffle unit and the second side plate, and the second extension of each of the curved plates of the first baffle unit is located in a region between the flat plate of the first baffle unit and the flat plate of the second baffle unit;
the first extension part of each bent plate of the second baffle unit is positioned in a region between the flat plate of the second baffle unit and the fourth side plate, and the second extension part of each bent plate of the second baffle unit is positioned in a region between the flat plate of the second baffle unit and the flat plate of the first baffle unit;
a space is defined at the center of the cell by the flat plates of the two partition plate units and the other end parts of the bent plates of the two partition plate units, and the acoustic cavity flow channel is communicated with the first opening and the second opening through the space.
In some embodiments, the core layer includes four separator units, a first separator unit, a second separator unit, a third separator unit, and a fourth separator unit, respectively;
one end of a plurality of clapboards of a first baffle unit is connected with the first side plate, one end of a plurality of clapboards of a second baffle unit is connected with the second side plate, one end of a plurality of clapboards of a third baffle unit is connected with the third side plate, and one end of a plurality of clapboards of a fourth baffle unit is connected with the fourth side plate;
the other ends of the plurality of separators of the first separator unit are opposite to the other ends of the plurality of separators of the third separator unit, and the other ends of the plurality of separators of the second separator unit are opposite to the other ends of the plurality of separators of the fourth separator unit;
the four baffle units define a space in the center of the cell, and the acoustic cavity runner is communicated with the first opening and the second opening through the space.
In some embodiments, the bending plate is an L-shaped plate, which comprises an extension part and a connecting part connected with the extension part;
the flat plates of the first baffle unit and the third baffle unit and the extending parts of the L-shaped plates extend along the direction parallel to the second side plate and the fourth side plate, and the connecting parts of the L-shaped plates of the first baffle unit and the third baffle unit extend along the direction parallel to the first side plate and the third side plate;
the extension parts of the flat plate and the L-shaped plate of the second baffle unit and the fourth baffle unit extend along the direction parallel to the first side plate and the third side plate, and the connection parts of the L-shaped plate of the second baffle unit and the fourth baffle unit extend along the direction parallel to the second side plate and the fourth side plate.
In some embodiments, the frame, the acoustic cavity flow channel cross-section, the first opening, and the second opening are circular or polygonal.
In some embodiments, the thickness of the cells is between 6 and 30 mm; the thickness of the first panel and the second panel is between 0.2 and 3mm; the opening area of the first panel and the second panel is 100-1000 mm 2 Between them; the cell size is 1650-10000 mm 2 Between them; the width delta d of the flow channel of the acoustic cavity is between 1 and 5mm; the wall thickness of the flow channel of the acoustic cavity is between 0.5 and 2.5 mm.
(III) beneficial effects
According to the technical scheme, the ventilation and sound insulation structure based on the acoustic metamaterial technology has at least one of the following beneficial effects:
(1) The ventilation and sound insulation structure can give consideration to ventilation and sound insulation effects, and effectively meets the use requirements.
(2) The ventilation and sound insulation structure is based on an acoustic metamaterial technology, fine construction of the plate internal structure is utilized, a metamaterial resonance unit is integrated inside, ventilation performance can be guaranteed, and meanwhile high sound insulation performance is achieved.
(3) According to the ventilation and sound insulation structure, the acoustic cavity flow channel is bent in the thickness direction, so that the lower sound wave frequency can be controlled by smaller thickness. By adopting the design of the bent flow channel of the metamaterial technology and designing the acoustic cavity flow channels with different lengths, the different flow channel lengths are correspondingly controlled to different acoustic frequencies, so that the air flow noise can be restrained within a wide frequency range.
(4) The full-metal structure is adopted, and the novel fire-resistant and fire-resistant composite material has the characteristics of light weight, high temperature resistance, fire resistance, steam corrosion resistance and impact corrosion resistance.
Drawings
Fig. 1 is a schematic view of a ventilation and sound insulation structure of the present disclosure.
Fig. 2 is a schematic cell view of the ventilation and sound insulation structure of the present disclosure.
Fig. 3 is a cellular explosion diagram of the ventilation and sound insulation structure of the present disclosure.
FIG. 4 is a schematic diagram of a cell core structure according to an embodiment of the disclosure.
FIG. 5 is a schematic view of a flexural plate structure in the cell core of FIG. 4.
FIG. 6 is a schematic diagram of a cell core structure according to another embodiment of the present disclosure.
FIG. 7 is a schematic view of a flexural plate structure in the cell core of FIG. 6.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
The broadband ventilation sound insulation structure disclosed by the disclosure is based on an acoustic metamaterial technology, fine construction of the plate internal structure is utilized, the high sound insulation performance can be realized on the premise of keeping the original ventilation performance unchanged by internally integrating the metamaterial resonance unit, the lower sound wave frequency is realized by bending the sound cavity flow channel in the thickness direction, the air flow noise is restrained within a wide frequency range, the average sound insulation quantity is at least improved by 5dB compared with the traditional ventilation structure, and the broadband ventilation sound insulation structure has the advantages of light weight, high temperature resistance, fire resistance, steam corrosion resistance and impact corrosion resistance.
The present disclosure provides a ventilation and sound insulation structure, as shown in fig. 1 to 3, including: a single cell or a plurality of cells 1 arranged periodically; wherein the cell comprises:
the center of the first panel 10 is provided with a first opening 101;
a second panel 20 disposed opposite to the first panel, and having a second opening (not shown) at its center, opposite to the first opening; a kind of electronic device with high-pressure air-conditioning system
A core layer 30, located between the first and second panels, has a plurality of flow channels 301 that communicate with the first and second openings.
The ventilation and sound insulation structure disclosed by the disclosure circulates air through the opening structure, and sound waves are reflected by the acoustic cavity flow channel, so that ventilation and sound insulation are realized.
By means of fine construction of the plate internal structure, high sound insulation performance can be achieved on the premise that original ventilation performance is kept unchanged.
The core layer comprises a frame and a plurality of baffle units positioned in the frame, each baffle unit comprises a plurality of baffles with different lengths, and a plurality of bent acoustic cavity flow passages with different lengths are formed between adjacent baffles and between the baffles and the frame. Therefore, the bending flow channel design of the metamaterial technology is adopted, and through designing the acoustic cavity flow channels with different lengths, the different flow channel lengths are correspondingly controlled to different acoustic frequencies, so that air flow noise can be restrained within a wide frequency range (namely, the broadband sound insulation of the metamaterial technology).
The different lengths of the partition plates correspond to the control of sound waves with different frequencies, the lengths of the partition plates are mainly determined according to the size of cells and the opening ratio (opening ratio) of the panel, and after the size of the cells and the opening ratio of the panel are determined, the lengths of the partition plates can be determined.
Specifically, the ventilation and sound insulation structure may be a sound insulation structure with 5×5 cells arranged, as shown in fig. 1. Of course, the 5×5 cell arrangement shown in fig. 1 is merely illustrative, and those skilled in the art will appreciate that any cell arrangement may be used for the sound insulation structure, and is not limited to the 5×5 cell arrangement.
The ventilation and sound insulation structure adopts an all-metal structure, and the thickness of the cells is between 6 and 30 mm; the thickness of the first panel and the second panel is between 0.2 and 3mm; the opening area of the first panel and the second panel is 100-1000 mm 2 Between them; the cell size is 1650-10000 mm 2 Between them; the width delta d of the flow channel of the acoustic cavity is between 1 and 5mm; the wall thickness of the flow channel of the acoustic cavity is between 0.5 and 2.5 mm.
As shown in fig. 2, the first opening and the second opening may be rectangular holes, the cells may be rectangular, the thickness of the sound insulation structure is H, the thicknesses of the first panel and the second panel are d, the areas of the rectangular holes of the first panel and the second panel are w×e, the areas of the cells are a×b, and the ventilation rate η=we/(ab) of the ventilation sound insulation structure.
In one embodiment, as shown in fig. 4-5, the first opening and the second opening are square holes; the core layer is provided with 8 flow passages connected with the square holes. Specifically, the core layer includes a frame, and the frame includes four side plates, namely a first side plate 302, a second side plate 303, a third side plate 304, and a fourth side plate 305, which are sequentially connected end to form a rectangular frame. The first side plate and the third side plate are arranged oppositely, and the second side plate and the fourth side plate are arranged oppositely.
The core layer further comprises two baffle units, namely a first baffle unit and a second baffle unit. Each partition plate unit comprises a plurality of partition plates which are arranged from inside to outside or from outside to inside, and the lengths of the plurality of partition plates are sequentially increased from inside to outside. In particular to the present embodiment, each diaphragm unit includes a flat plate 306 (i.e., first diaphragm) and three curved plates 307,308,309 (second, third, and fourth diaphragms, respectively). The lengths of the flat plate 306, the bending plate 307, the bending plate 308 and the bending plate 309 are sequentially increased.
One end of each of the two baffle units is connected with the two opposite side plates, the other end faces the middle of the core layer, specifically, one end of each of the plurality of baffles of the first baffle unit is connected with the first side plate, and one end of each of the plurality of baffles of the second baffle unit is connected with the third side plate. The other ends of the plurality of separators of the first separator unit are opposite to and do not contact the other ends of the plurality of separators of the second separator unit.
The flat plate 306 is located near the middle of the core layer with a space between the flat plates of the two separator units. Each of the curved plates 307,308,309 is in the form ofThe plate 306 is located in the area surrounded by the bending plate 306, the bending plate 306 is located in the area surrounded by the bending plate 307, and the bending plate 307 is located in the area surrounded by the bending plate 308. Each bending plate comprises a first extension part 310, a second extension part 311 and a connecting part 312, wherein one end of the connecting part is connected with the first extension part, and the other end of the connecting part is connected with the second extension part. The lengths of the flat plate 306, the first extension portion of the bending plate 307, the first extension portion of the bending plate 308, and the first extension portion of the bending plate 309 sequentially increase; the second extension of the bending plate 307, the second extension of the bending plate 308, and the second extension of the bending plate 309 sequentially increase in length; the length of the connection portion of the bending plate 307, the connection portion of the bending plate 308, and the connection portion of the bending plate 309 increases in order.
The first extending parts of the flat plate and the bending plate extend along the direction parallel to the second side plate and the fourth side plate, the second extending part of the bending plate extends along the direction parallel to the second side plate and the fourth side plate, and the connecting part of the bending plate extends along the direction parallel to the first side plate and the third side plate.
The first extension of each of the curved plates of the first separator unit is located in a region between the flat plate of the first separator unit and the second side plate, and the second extension of each of the curved plates of the first separator unit is located in a region between the flat plate of the first separator unit and the flat plate of the second separator unit. The first extension of each bent plate of the second separator unit is located in a region between the flat plate of the second separator unit and the fourth side plate, and the second extension of each bent plate of the second separator unit is located in a region between the flat plate of the second separator unit and the flat plate of the first separator unit. A plurality of curved flow channels 301 of different lengths are formed between adjacent partitions, and between a side plate and its adjacent partition, such as between a fourth side plate 305 and a curved plate 309, between a first side plate 302 and a curved plate 309, between a curved plate 309 and a curved plate 308, between a curved plate 308 and a curved plate 307, between a curved plate 307 and a flat plate 306, between a curved plate 309 and a flat plate 306, and so forth.
A space 313 is defined in the center of the cell by the flat plates of the two partition units and the other ends of the bent plates of the two partition units. The space is opposite to the positions of the first opening and the second opening, and the areas are the same. The runner is formed in the space of the core layer cell at the core layer removing opening and is connected with the opening.
In this embodiment, the core layer is formed with 8 flow channels, wherein the thickness h=12 mm of the cells; the thickness d=1mm of the upper and lower panels; the opening sizes w=15mm, e=15mm of the upper and lower panels; cell size a=52 mm, b=52 mm; runner width Δd=3 mm; the wall thickness t=1 mm of the flow channel. The lengths of the four clapboards of each clapboard unit are sequentially from small to large: 33.18mm, 48.62mm, 65.75mm, 82.87mm.
In another embodiment, as shown in fig. 6-7, the core layer has 16 flow channels connected to square holes, unlike the previous embodiment. Specifically, the core layer further comprises four baffle units, each baffle unit comprises a plurality of baffles, and the length of each baffle increases from inside to outside. In particular to the present embodiment, each diaphragm unit includes a flat plate 314 and three flexural plates 315,316,317. The lengths of the flat plate 314, the bending plate 315, the bending plate 316 and the bending plate 317 are sequentially increased.
One ends of a plurality of separators of a first separator unit are connected to the first side plate 302, one ends of a plurality of separators of a second separator unit are connected to the second side plate 303, one ends of a plurality of separators of a third separator unit are connected to the third side plate 304, and one ends of a plurality of separators of a fourth separator unit are connected to the fourth side plate 305. The other ends of the plurality of separators of the first separator unit are opposite to the other ends of the plurality of separators of the third separator unit, and the other ends of the plurality of separators of the second separator unit are opposite to the other ends of the plurality of separators of the fourth separator unit.
One end of each flat plate of each partition plate unit is connected with each side plate, and the other end extends to a position close to the center of the core layer and is provided with a space; each bending plate is positioned in the bending plate area defined by two adjacent side plates and two flat plates respectively connected with the two side plates, and the two bending plates are mutually separated.
The bent plate is an L-shaped plate, which includes an extension 318 and a connection 319 connected to the first extension. The extension parts of the flat plate and the L-shaped plate of the first baffle unit and the third baffle unit extend along the direction parallel to the second side plate and the fourth side plate, and the connection parts of the L-shaped plate of the first baffle unit and the third baffle unit extend along the direction parallel to the first side plate and the third side plate. The extension parts of the flat plate and the L-shaped plate of the second baffle unit and the fourth baffle unit extend along the direction parallel to the first side plate and the third side plate, and the connection parts of the L-shaped plate of the second baffle unit and the fourth baffle unit extend along the direction parallel to the second side plate and the fourth side plate. The lengths of the flat plate 314, the first extension of the bending plate 315, the first extension of the bending plate 316, and the first extension of the bending plate 317 sequentially increase; the length of the connecting portion of the bending plate 315, the connecting portion of the bending plate 316, and the connecting portion of the bending plate 317 increases sequentially.
A plurality of curved flow passages with different lengths are formed between the adjacent partition plates and between the side plates and the adjacent partition plates. The four partition plate units define a space in the center of the cell, and the space is opposite to the first opening and the second opening and has the same area. The runner is formed in the space of the core layer cell at the core layer removing opening and is connected with the opening.
In this embodiment, the core layer is formed with 16 flow channels, where the overall thickness h=12 mm of the cells; the thickness d of the upper panel and the lower panel is 1mm, the central square hole dimension w of the upper panel and the lower panel is 15mm, and e is 15mm; cell size a=52 mm, b=52 mm; runner width Δd=3 mm; the wall thickness t=1 mm of the flow channel. The four separators of each separator unit are 17.5mm, 24.9mm, 33.25mm, 41.62mm in length from small to large in order.
While the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and that any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Thus, embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. From the foregoing description, those skilled in the art will readily appreciate the present disclosure.
It should be noted that, in the drawings or the text of the specification, implementations not shown or described are all forms known to those of ordinary skill in the art, and not described in detail. Furthermore, the above definitions of the elements and methods are not limited to the specific structures, shapes or modes mentioned in the embodiments, and may be simply modified or replaced by those of ordinary skill in the art.
Under the space limitation of the cells, the number of the flow channels is not limited to 8 or 16, the design can be carried out according to the width and the length of the flow channels, and the cross sections of the flow channels can be round, triangular, square and the like.
The number of the partition units is not limited to two or four, the number of the partitions of each partition unit is not limited to one flat plate and three bent plates, and the bent plates are not limited toA shape or an L-shape.
The shape of the panel, core, opening is not limited to rectangular, but may be other shapes, such as circular, triangular, hexagonal, etc.
Of course, according to actual needs, the method of the present disclosure further includes other steps, which are not described herein because they are irrelevant to innovations of the present disclosure.
While the foregoing is directed to embodiments of the present disclosure, other and further details of the invention may be had by the present application, it is to be understood that the foregoing description is merely exemplary of the present disclosure and that no limitations are intended to the scope of the disclosure, except insofar as modifications, equivalents, improvements or modifications may be made without departing from the spirit and principles of the present disclosure.
Claims (6)
1. A ventilation and sound insulation structure comprising: a cell or a plurality of cells (1) arranged periodically; wherein, the cellular adopts full metal structure, includes:
a first panel (10) having a first opening (101) at the center thereof;
a second panel (20) which is arranged opposite to the first panel, and is provided with a second opening at the center thereof and is opposite to the first opening; a kind of electronic device with high-pressure air-conditioning system
A core layer (30) between the first and second panels having a plurality of acoustic cavity flow channels (301) in communication with the first and second openings;
the core layer comprises a frame and a plurality of baffle units positioned in the frame, each baffle unit comprises a plurality of baffles with different lengths, and a plurality of bent acoustic cavity flow passages with different lengths are formed between adjacent baffles and between the baffles and the frame;
the frame comprises four side plates, namely a first side plate (302), a second side plate (303), a third side plate (304) and a fourth side plate (305), which are connected end to end in sequence to form a rectangular shape;
said core comprising a said frame and two or four said spacer units within said frame, each spacer unit comprising a flat plate (306; 314) and three curved plates (307, 308,309;315,316, 317);
the core layer comprises two baffle units, namely a first baffle unit and a second baffle unit, wherein one ends of a plurality of baffles of the first baffle unit are connected with the first side plate, and one ends of a plurality of baffles of the second baffle unit are connected with the third side plate; the other ends of the plurality of separators of the first separator unit are opposite to the other ends of the plurality of separators of the second separator unit;
each bending plate (307, 308, 309) comprises a first extension (310), a second extension (311) and a connection (312), one end of which is connected to the first extension and the other end of which is connected to the second extension;
the flat plate (306) and the first and second extending portions of the bending plates (307, 308, 309) extend in a direction parallel to the second and fourth side plates, the connecting portions of the bending plates extend in a direction parallel to the first and third side plates, and each bending plate is connected with the side plate through the first extending portion.
2. The ventilating sound-insulating structure according to claim 1, wherein,
the first extension part of each bent plate of the first baffle unit is positioned in a region between the flat plate of the first baffle unit and the second side plate, and the second extension part of each bent plate of the first baffle unit is positioned in a region between the flat plate of the first baffle unit and the flat plate of the second baffle unit;
the first extension part of each bent plate of the second baffle unit is positioned in a region between the flat plate of the second baffle unit and the fourth side plate, and the second extension part of each bent plate of the second baffle unit is positioned in a region between the flat plate of the second baffle unit and the flat plate of the first baffle unit;
a space (313) is defined in the center of the cell by the flat plates of the two diaphragm units and the other end portions of the bent plates of the two diaphragm units, and the acoustic cavity flow channel is communicated with the first opening and the second opening through the space.
3. The ventilating sound-insulating structure according to claim 1, wherein,
the core layer comprises four baffle units, namely a first baffle unit, a second baffle unit, a third baffle unit and a fourth baffle unit;
one end of a plurality of clapboards of a first baffle unit is connected with the first side plate, one end of a plurality of clapboards of a second baffle unit is connected with the second side plate, one end of a plurality of clapboards of a third baffle unit is connected with the third side plate, and one end of a plurality of clapboards of a fourth baffle unit is connected with the fourth side plate;
the other ends of the plurality of separators of the first separator unit are opposite to the other ends of the plurality of separators of the third separator unit, and the other ends of the plurality of separators of the second separator unit are opposite to the other ends of the plurality of separators of the fourth separator unit;
the four baffle units define a space in the center of the cell, and the acoustic cavity runner is communicated with the first opening and the second opening through the space.
4. A ventilation and sound insulation structure according to claim 3, wherein,
the bending plate (315,316,317) is an L-shaped plate and comprises an extension part (318) and a connecting part (319) connected with the extension part;
the flat plates (314) of the first baffle unit and the third baffle unit and the extending parts of the L-shaped plates extend along the direction parallel to the second side plate and the fourth side plate, and the connecting parts of the L-shaped plates of the first baffle unit and the third baffle unit extend along the direction parallel to the first side plate and the third side plate;
the extension parts of the flat plate and the L-shaped plate of the second baffle unit and the fourth baffle unit extend along the direction parallel to the first side plate and the third side plate, and the connection parts of the L-shaped plate of the second baffle unit and the fourth baffle unit extend along the direction parallel to the second side plate and the fourth side plate.
5. A ventilating sound insulation structure according to claim 1, wherein the frame, the acoustic cavity flow passage section, the first opening and the second opening are circular or polygonal.
6. A ventilating sound insulation structure according to claim 1, wherein the thickness of the cells is between 6 and 30 mm; the thickness of the first panel and the second panel is between 0.2 and 3mm; the opening area of the first panel and the second panel is 100-1000 mm 2 Between them; the cell size is 1650-10000 mm 2 Between them; the width delta d of the flow channel of the acoustic cavity is between 1 and 5mm; the wall thickness of the flow channel of the acoustic cavity is between 0.5 and 2.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811265734.7A CN109243419B (en) | 2018-10-26 | 2018-10-26 | Ventilating sound insulation structure based on acoustic metamaterial technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811265734.7A CN109243419B (en) | 2018-10-26 | 2018-10-26 | Ventilating sound insulation structure based on acoustic metamaterial technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109243419A CN109243419A (en) | 2019-01-18 |
| CN109243419B true CN109243419B (en) | 2023-12-01 |
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| JP7310120B2 (en) * | 2018-11-05 | 2023-07-19 | ヤマハ株式会社 | sound absorbing structure |
| JP7172457B2 (en) | 2018-11-05 | 2022-11-16 | ヤマハ株式会社 | Sound-absorbing units and sound-absorbing structures |
| CN110473510B (en) * | 2019-07-31 | 2024-06-18 | 中国船舶重工集团公司第七一四研究所 | Cell structure based on phonon crystal and return air sound insulation device |
| DE102020116396A1 (en) | 2020-06-22 | 2021-12-23 | Kaiser GmbH | Sound absorber |
| CN115675317B (en) * | 2023-01-03 | 2023-04-07 | 质子汽车科技有限公司 | Vehicle with a steering wheel |
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