CN102296716A - Total reflection sound insulation structure - Google Patents
Total reflection sound insulation structure Download PDFInfo
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- CN102296716A CN102296716A CN2011102626533A CN201110262653A CN102296716A CN 102296716 A CN102296716 A CN 102296716A CN 2011102626533 A CN2011102626533 A CN 2011102626533A CN 201110262653 A CN201110262653 A CN 201110262653A CN 102296716 A CN102296716 A CN 102296716A
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Abstract
The invention relates to a sound insulation structure designed by using the total reflection principle of sound wave. Through the total reflection sound insulation structure, after the incident sound wave is totally reflected and transmitted for multiple times, the sound energy is effectively reflected to the original incident side of the sound wave, so that the sound insulation structure has good sound insulation performance. The total reflection sound insulation structure provided by the invention mainly consists of a folded panel, a flat panel and a space between the two panels. The angles formed between the folded faces of the surface of one side of the folded panel close to the flat panel and the flat panel are equal, and the angle formed between two adjacent folded faces in the folded faces of the surface of one side of the folded panel 1 close to the flat panel is equal to a proper angle.
Description
Technical field
The present invention relates to a kind of sound insulating structure, relate in particular to a kind of sound insulating structure that utilizes the design of sound wave total reflection principle.
Background technology
Adopting opacity technique effectively must cut off the noise transmission approach, is the conventional means of noise control.Sound insulating structure commonly used at present has individual layer to spare matter thin plate, the compound sound insulating structure of individual layer, doubling plate sound insulating structure, multiple light-duty sound insulating structure, the heavy partition wall of individual layer, double-deck heavy partition wall and multilayer sound insulating structure.Common partiting sound member such as door and window, body of wall, floor etc., can belong in the above sound insulating structure.These common structures are that the acoustic wave transmission character according to medium designs.The height of sound insulation factor mainly is subjected to the weight and the incident acoustic wave frequency influence of sound insulating structure unit area, and simultaneously, damping in these sound insulating structures and sound absorption material also can exert an influence to sound insulation factor.These sound insulating structures often need very big weight per unit area in order to realize higher sound insulation factor; And even under the very big situation of weight per unit area, the sound insulation factor of these sound insulating structures is also all relatively limited.
Summary of the invention
The present invention be directed to that problem that existing sound insulating structure exists proposes, purpose provides a kind of total reflection sound insulating structure that can realize higher sound insulation factor with less weight per unit area.
The cardinal principle and the structure of total reflection sound insulating structure proposed by the invention are as follows:
Total reflection sound insulating structure proposed by the invention mainly designs in the principle that total reflection phenomenon may take place at the interface of the different velocities of sound according to sound wave.When sound wave is the material of v1 when inciding the velocity of sound and being the material of v2 by the velocity of sound, if v1 less than v2, then when angle of incidence more than or equal to
The time, total reflection will take place, it can the velocity of sound be in the material of v1 that all incident acoustic waves all are launched.
The structural representation of total reflection sound insulating structure proposed by the invention mainly is made of institute's clip space 3 between a folding panel 1, surface plate 2 and the two panels as shown in Figure 1.
The generalized section of total reflection sound insulating structure proposed by the invention as shown in Figure 2.Each folding face on the surface of close surface plate 2 one sides of folding panel 1 all equates with surface plate 2 angulations.Suppose to be full of in the sound insulating structure outer space 4 material that the velocity of sound is c1; In the sound insulating structure, surface plate 2 is that the material of c2 constitutes by the velocity of sound, and folding panel 1 is that the material of c4 constitutes by the velocity of sound, and institute's clip space 3 is full of the material that the velocity of sound is c3 between two panels; And, c1＜c2, c3＜c4, c3＜c2.Thereby, when sound wave incides surface plate 2 by sound insulating structure outer space 4, the angle of total reflection
When sound wave incides folding panel 1 by two panels institute clip space 3, the angle of total reflection
When sound wave incides surface plate 2 by two panels institute clip space 3, the angle of total reflection
When sound wave again sound insulating structure outer space 4 pass surface plate 2 transmissions when entering two panels institute clip space 3, in two panels institute clip space 3, the maximum angle of refraction of sound wave
In total reflection sound insulating structure proposed by the invention, the angle w that keeps in each folding face on surface of close surface plate 2 one sides of folding panel 1 two adjacent folding faces to be become belongs to the interval
At this moment, all incident acoustic waves all are totally reflected in the two panels institute clip space 3, thereby significantly reduce the acoustic energy of transmission, have good sound insulation property by this sound insulating structure.Ideally, the angle w that keeps in each folding face on surface of close surface plate 2 one sides of folding panel 1 two adjacent folding faces to be become in the total reflection sound insulating structure proposed by the invention belongs to the interval
(common factor in two intervals is asked in symbol " ∩ " expression), this moment can the time incident acoustic wave through repeatedly total reflection and transmission, finally be reflected back to a side of original incident, thereby make sound insulation property reach optimum.
Obtain by surface plate 2 one side incident sound insulating structures according to sound wave though more than analyze,, resulting all conclusions are equally applicable to go into the directive sound insulating structure by folding panel 2 one sides.When this total reflection structure of practical application, both can make surface plate one side towards noise source, also can make folding panel one side towards noise source.
In the full emission sound insulating structure that this paper proposed, can be unequal between each folding face on the surface of close surface plate 2 one sides of folding panel 1 and each angle that surface plate 2 is become.In actual applications, even can not guarantee to roll over each folding face on surface of close surface plate 2 one sides of panel 1 all equates with surface plate 2 angulations, as long as become difference between each angle within the certain angle scope, this total reflection sound insulating structure still can play good defening effect; The size of described angular range is subjected to rolling over the influence of three factors of material of being filled in the constituent material, two panels institute clip space 3 of constituent material, the surface plate 2 of panel 1.
Folding panel 1 (seeing shown in Fig. 2) in the total reflection sound insulating structure proposed by the invention mainly has requirement to the folding face shape on the surface of adjacent plane plate one side, and the curve form away from the surface of surface plate one side is not required.Therefore, folding panel shown in Figure 2 can have various deformation.The generalized section of the full emission sound insulating structure that the folding panel after a kind of distortion shown in Figure 3 is constituted.The surface of folding panel 5 adjacent plane plates one side among Fig. 3 after the distortion is the folding face, and the surface of opposite side then is the plane.Folding panel after the distortion shown in Figure 3 is a kind of possible situation, and the folding panel in the total reflection sound insulating structure proposed by the invention can have other multiple possible distortion.
The thickness of folding panel 1, surface plate 2 and two panels institute clip space 3 is not subjected to any restriction in the total reflection sound insulating structure proposed by the invention, can be any suitable numerical value.The size of rolling over each folding face of panel simultaneously is not subjected to any restriction yet, can select suitable dimensions according to actual needs.
Distance in the total reflection sound insulating structure proposed by the invention between folding panel 1 and the surface plate 2 is not subjected to any restriction yet, can select according to actual needs.The folding panel 1 both can be close to surface plate 2, also can with surface plate 2 wide aparts.In the reality, for the sound insulation property that makes this total reflection sound insulating structure reaches best, suggestion should make not contact plane plate 2 of folding panel 1 under the situation that physical condition allows, and it is transaudient to form overhead speaker so that avoid the two panels contact, reduces defening effect.
In total reflection sound insulating structure proposed by the invention, can will seal with plate washer around the two panels institute clip space.Fig. 4 is the generalized section after surface plate 2 and folding panel 1 folded space 3 usefulness plate washers 6 are sealed.During sealing, used plate washer 6 can be any material that can be suitable for, such as gypsum plank, steel plate, glass plate, plank, composite board etc.Plate washer 6 material therefors also can be the materials with sound absorption or acoustic attenuation performance, such as rubber, and glass wool, asbestos, compound sound-absorption structural or noise elimination structure etc.In two panels institute clip space 3, also can fill material, such as the liquid with viscous sound absorbing capabilities, asbestos, glass wool, perforated plate and some other sound absorption or deadener or structure with noise elimination, sound absorbing capabilities.If plate washer 6 has sound absorbing capabilities, perhaps have material or the structure that can eliminate the noise or absorb sound in the two panels institute clip space 3, then the acoustic energy in the two panels institute clip space 3 can be absorbed or subdue, thereby helps to improve the sound insulation property of this sound insulating structure.
In the total reflection sound insulating structure proposed by the invention, used surface plate 2, folding panel 1 and two panels institute clip space 3 can be any operable solid material, fluent material or gas material.When adopting liquid or gas material, only need make them present surface plate 2, folding panel 1 or two panels institute clip space 3 desired outer contoured shape and get final product.Constitute surface plate 2 and comprise multiple material, such as glass, iron and steel, timber, rubber, plastics, gypsum, cement and some other material etc. with folding panel 1 material commonly used.Two panels institute clip space 3 material therefors comprise air, inert gas, water, various oils, various viscosity liquid and some other material etc.In the total reflection sound insulating structure proposed by the invention, surface plate 2, folding panel 1 and two panels institute clip space 3 used constituent materials needn't be identical, even arbitrary parts can have different materials to constitute.Such as, glass is adopted in some zone of surface plate 2, and steel plate etc. can be adopted in the other zone.Doubling panel 1 and two panels institute clip space 3 can adopt different materials to constitute equally.Wherein, for two panels institute clip space 3, any material also can not filled in its inside.
The generalized section of this total reflection sound insulating structure as shown in Figure 2.Each folding face on the surface of close surface plate 2 one sides of folding panel 1 all equates with surface plate 1 angulation.Suppose that surface plate 2 and folding panel 1 all are is that the material of c6 constitutes by the velocity of sound; The two panels institute clip space 3 and the sound insulating structure outside all are full of the material that the velocity of sound is c5; And c5＜c6.Then sound wave is when inciding each interface, if total reflection, the then angle of total reflection can take place
In such cases, the total reflection sound insulating structure proposed by the invention angle w that keeps in each folding face on surface of close surface plate 2 one sides of folding panel 1 two adjacent folding faces to be become belongs to the interval
At this moment, all incident acoustic waves all are totally reflected in the two panels institute clip space 3, thereby significantly reduce the acoustic energy of transmission, have good sound insulation property by this sound insulating structure.In such cases, the angle w that keeps in each folding face on surface of close surface plate 2 one sides of folding panel 1 two adjacent folding faces to be become in the total reflection sound insulating structure proposed by the invention equals 90 and spends and can make the defening effect of this total reflection sound insulating structure reach best, can make incident acoustic wave through repeatedly total reflection and transmission this moment, finally be reflected back to a side of original incident, thereby make sound insulation property reach optimum.
In the total reflection sound insulating structure proposed by the invention, described surface plate 2 and folding panel 1 can adopt same material to constitute; And all be full of material of the same race in two panels institute clip space 3 and the sound insulating structure outer space 4; The angle w that two adjacent folding faces are become in each folding face on surface of close surface plate 2 one sides of folding panel 1 equals 90 and spends; Each folding face on the surface of close surface plate 2 one sides of folding panel 1 and surface plate 2 angulations all equal 45 degree.
The total reflection sound insulating structure that is put forward among multilayer the present invention is carried out compoundly can obtaining compound total reflection sound insulating structure, and the schematic diagram of this compound total reflection sound insulating structure as shown in Figure 5 and Figure 6.
Compound total reflection sound insulating structure shown in Figure 5 can be regarded as by two total reflection sound insulating structures and is composited.This compound total reflection sound insulating structure is made of two plate plane plates 2 and a folding panel 1; Two plate plane plates 2 are parallel to each other; Folding panel 1 is between two plate plane plates 2; Thickness is identical everywhere for folding panel 1, and angulation all equals 45 degree between each little folding face isoplanar plate 2 of folding panel 1; On the folding panel 1 between adjacent two little folding faces angulation w equal 90 degree; Seal with plate washer 6 around folding panel 1 and 2 clip spaces 3 of surface plate.
In the compound full emission sound insulating structure shown in Figure 5, described folding panel 1 and surface plate 2 all are made of glass.
Compound total reflection sound insulating structure shown in Figure 6 can be regarded as by four total reflection sound insulating structures and is composited.This compound total reflection sound insulating structure is made of three layer plane plates 2 and two-layer folding panel 1.Three plate plane plates 2 are parallel to each other.Thickness is identical everywhere for two folding panels 1, and angulation all equals 45 degree between each little folding face isoplanar plate 2 of folding panel 1.On the folding panel 1 between adjacent two little folding faces angulation w equal 90 degree.Folding panel 1 is not necessarily identical to the minimum distance of surface plate 2.Seal with plate washer 6 around this structure.Plate washer 6 can be made by steel plate commonly used, plank, plastic plate etc., also can be made of rubber, glass wool, perforation board resonance sound absorption structure etc.In two spaces 3 that middle two folding panels are become with surface plate, perforated plate 7 is housed near the centre.Be filled with sound absorption material 8 at two perforated plates 7 with apart from them between the nearest folding panel 1.This sound absorption material 8 can be glass wool, asbestos, porous foam, foamed aluminium, metallic fiber, also can be other suitable sound-absorption material.This compound total reflection sound insulating structure is all having well isolated effect to noise in the broadband very much.
The total reflection sound insulating structure that is put forward among multilayer the present invention is carried out compound tense can carry out according to multiple mode.Fig. 5 and compound sound insulating structure shown in Figure 6 are two kinds of special cases wherein.Under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when can be constructed in accordance going out multiple other compound total reflection sound insulating structure, but all these possible compound total reflection sound insulating structures all should belong to the protection domain of the claim under the present invention.
Total reflection sound insulating structure proposed by the invention can make incident acoustic wave through after repeatedly total reflection and the transmission, with an acoustic energy side of the original incident of reflected back sound wave effectively, thereby make this sound insulating structure under the less situation of weight per unit area, just can have very high sound insulation factor.Full emission sound insulating structure proposed by the invention can be widely used in to be had in the various fields of requirement sound insulation.
Description of drawings
Fig. 1 is the structural representation of total reflection sound insulating structure.
Fig. 2 is the cross-sectional view of total reflection sound insulating structure.
Fig. 3 is a kind of cross-sectional view that has the total reflection sound insulating structure of distortion back folding panel.
Fig. 4 is the cross-sectional view after the sealing with plate washer all around of two panels institute clip space.
Fig. 5 is a kind of cross-sectional view of compound total reflection structure
Fig. 6 is a kind of cross-sectional view of the compound total reflection sound insulating structure that multilayer total reflection sound insulating structure is obtained after compound.
Drawing is described as follows (Fig. 1 to Fig. 6):
1-rolls over panel; The 2-surface plate; 3-two panels institute clip space; 4-sound insulating structure outer space;
Folding panel after the 5-distortion; The 6-plate washer; The 7-perforated plate; The 8-sound absorption material.
The specific embodiment
Below by concrete embodiment the present invention is remarked additionally.
Embodiment 1:
With reference to Fig. 2.Surface plate 2 and folding panel 1 are all made by corrosion resistant plate, and the thickness of steel plate can be selected as required, are a certain numerical value between 0.8～5.0 millimeter such as thickness.Angulation w equals 90 degree between two adjacent folding faces of folding panel 1.The width a certain numerical value that equals to correspond to actual needs of each folding face on the folding panel 1 is such as 2 centimetres, 5 centimetres, 10 centimetres etc.Each folding face of the close surface plate 2 of folding panel 1 all equals 45 degree with surface plate 2 angulations.Minimum distance between folding panel 1 and the surface plate 2 equals a certain numerical value, such as 1 centimetre, 2 centimetres, 10 centimetres etc.Space 3 and sound insulating structure outer space 4 between the two panels all are full of air.This structure is installed in the place that needs sound insulation, just can realizes defening effect preferably.
Embodiment 2:
With reference to Fig. 5.This structure is made of two plate plane plates 2 and a folding panel 1.Two plate plane plates 2 are parallel to each other.Thickness is identical everywhere for folding panel 1, and angulation all equals 45 degree between each little folding face isoplanar plate 2 of folding panel 1.On the folding panel 1 between adjacent two little folding faces angulation w equal 90 degree.Surface plate 2 is made of glass, and its thickness equals a certain suitable numerical value, such as 2 millimeters, 5 millimeters, 8 millimeters etc.; Folding panel 1 is made of glass, and its thickness equals a certain suitable numerical value, such as 2 millimeters, 3 millimeters, 5 millimeters etc.The minimum distance of 1 to two surface plate 2 of folding panel is not necessarily identical.Folding panel 1 can equal a certain suitable numerical value to the minimum range of each surface plate, such as 8 millimeters, 12 millimeters, 20 millimeters etc.Seal with plate washer 6 around this structure.Plate washer 6 can constitute by making hollow glass press strip and fluid sealant commonly used, also can be made of rubber, glass wool, perforation board resonance sound absorption structure etc.In surface plate 2 and folding panel 1 formed space 3, be full of inert gas or air.This total reflection sound insulation hollow glass outer space 4 is full of air.This total reflection sound insulating structure can be regarded as a kind of total reflection sound insulation hollow glass, and it can utilize the effective noise insulation of total reflection principle of sound wave, has good sound insulation property.
Embodiment 3:
With reference to Fig. 6.This structure is made of three layer plane plates 2 and two-layer folding panel 1.Surface plate 2 and folding panel 1 can be made by steel plate, and thickness is a certain suitable numerical value, such as a certain thickness between 0.8～5 millimeter.Three plate plane plates 2 are parallel to each other.Thickness is identical everywhere for two folding panels 1, and angulation all equals 45 degree between each little folding face isoplanar plate 2 of folding panel 1.On the folding panel 1 between adjacent two little folding faces angulation w equal 90 degree.Folding panel 1 is not necessarily identical to the minimum distance of surface plate 2.Folding panel 1 can equal a certain suitable numerical value to the minimum range of surface plate, such as 2 centimetres, 5 centimetres, 10 centimetres etc.Seal with plate washer 6 around this structure.Plate washer 6 can be made by steel plate commonly used, plank, plastic plate etc., also can be made of rubber, glass wool, perforation board resonance sound absorption structure etc.In two spaces 3 that middle two folding panels are become with surface plate, perforated plate 7 is housed near the centre.This perforated plate 7 can be common perforated plate, and piercing aperture is greater than 1 millimeter; Also can be microperforated panel, piercing aperture is between 0～1 millimeter.Be filled with sound absorption material 8 at two perforated plates 7 with apart from them between the nearest folding panel 1.This sound absorption material 8 can be glass wool, asbestos, porous foam, foamed aluminium, metallic fiber, also can be other suitable sound-absorption material.The sound insulating structure that this multilayer total reflection sound insulating structure is composited is all having well isolated effect to noise in the broadband very much.
Embodiment 4:
With reference to Fig. 3.This structure is made of folding panel 1 and the surface plate 2 after being out of shape.Folding panel 1 and surface plate 2 can be built into by cement, and each surface of two plates all polishes, and are preferably in each surface and can paint or stick smooth ceramic tile.The thickness of folding panel 1 and surface plate 2 can be selected a suitable numerical value according to actual conditions, such as 10 centimetres, 15 centimetres or 20 centimetres etc.Angulation all equals 45 degree between each little folding face isoplanar plate 2 on the surface of close surface plate 2 one sides of folding panel 1.In each little folding face on surface of close surface plate 2 one sides of folding panel 1 between adjacent two little folding faces angulation w equal 90 and spend.Each little folding face width degree on the surface of close surface plate 2 one sides of folding panel 1 can be selected according to actual conditions, such as equaling 10 centimetres, 20 centimetres etc.What roll over panel 1 is the plane apart from surface plate 2 surfaces far away, and is parallel to surface plate.Minimum range between folding panel 1 and the surface plate 2 can equal a certain suitable numerical value, such as equaling 10 centimetres, 12 centimetres, 15 centimetres etc.Can seal with cement, gypsum plank or some other suitable material around the space 3 between folding panel 1 and the surface plate 2.The common plane double wall that the sound-proof wall that this structure is made is made than same thickness same material has better defening effect.
Certainly; the present invention can also have other multiple examples; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the affiliated claim of the present invention.
Claims (10)
1. a total reflection sound insulating structure is characterized in that: be made of a folding panel (1) and a surface plate (2); Folding panel (1) is a folding face shape near a side surface of surface plate (2), and folding panel (1) can have any shape away from a side surface of surface plate (2); The angle that two adjacent folding faces are become in each folding face on surface of close surface plate (2) one sides of folding panel (1) belongs to the interval
Wherein,
C1 is the velocity of sound of contained material in the sound insulating structure outer space (4), and c2 is the velocity of sound of contained material in the surface plate (2), and c3 is the velocity of sound of contained material in the two plates institute clip space (3), and c4 is the velocity of sound of contained material in the folding panel (1).
2. total reflection sound insulating structure as claimed in claim 1 is characterized in that: the thickness of described folding panel (1) equates everywhere.
3. total reflection sound insulating structure as claimed in claim 1 is characterized in that: each folding face on the surface of close surface plate (2) one sides of described folding panel (1) all equates with surface plate (2) angulation.
4. total reflection sound insulating structure as claimed in claim 1 is characterized in that: the angle that two adjacent folding faces are become in each folding face on the surface of close surface plate (2) one sides of described folding panel (1) belongs to interval
Wherein,
C1 is the velocity of sound of contained material in the sound insulating structure outer space (4), c2 is the velocity of sound of contained material in the surface plate (2), c3 is the velocity of sound of contained material in the two plates institute clip space (3), and c4 asks the common factor in two intervals for the velocity of sound of contained material in the folding panel (1), symbol " ∩ " expression.
5. total reflection sound insulating structure as claimed in claim 1 is characterized in that: the plate washer (6) of using all around in folded space (3) seals between described surface plate (2) and the folding panel (1).
6. total reflection sound insulating structure as claimed in claim 4 is characterized in that: the plate washer (6) of using all around in folded space (3) seals between surface plate (2) and the folding panel (1); Each folding face on the surface of close surface plate (2) one sides of folding panel (1) all equates with surface plate (2) angulation.
7. total reflection sound insulating structure as claimed in claim 6 is characterized in that: folding panel (1) is contact plane plate (2) not.
8. total reflection sound insulating structure as claimed in claim 1 is characterized in that: described surface plate (2) and folding panel (1) adopt same material to constitute; And all be full of material of the same race in two panels institute clip space (3) and the sound insulating structure outer space (4); The angle that two adjacent folding faces are become in each folding face on surface of close surface plate (2) one sides of folding panel (1) equals 90 and spends; Each folding face on the surface of close surface plate (2) one sides of folding panel (1) and surface plate (2) angulation all equal 45 degree.
9. total reflection sound insulating structure as claimed in claim 1 is characterized in that: described total reflection sound insulating structure is compound total reflection sound insulating structure; Constitute by two plate plane plates (2) and a folding panel (1); Two plate plane plates (2) are parallel to each other; Folding panel (1) is positioned between the two plate plane plates (2); Thickness is identical everywhere for folding panel (1), and the angle that is become between each little folding face isoplanar plate (2) of folding panel (1) all equals 45 degree; The angle that is become between last adjacent two the little folding faces of folding panel (1) equals 90 degree; Folding panel (1) and surface plate (2) all are made of glass; Seal with plate washer (6) around folding panel (1) and surface plate (2) the institute's clip space (3).
10. total reflection sound insulating structure as claimed in claim 1 is characterized in that: described total reflection sound insulating structure is compound total reflection sound insulating structure; Constitute by three layer plane plates (2) and two-layer folding panel (1); Three plate plane plates (2) are parallel to each other; Thickness is identical everywhere for two folding panels (1), and the angle that is become between each little folding face isoplanar plate (2) of folding panel (1) all equals 45 degree; The angle that is become between last adjacent two the little folding faces of folding panel (1) equals 90 degree; Seal with plate washer (6) around the described compound total reflection sound insulating structure; In two spaces (3) that middle two folding panels are become with surface plate, perforated plate (7) is housed near the centre; Be filled with sound absorption material (8) at two perforated plates (7) with apart from them between the nearest folding panel (1); Described sound absorption material (8) is glass wool, asbestos, porous foam, foamed aluminium or metallic fiber.
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| CN2011102626533A CN102296716A (en) | 2011-09-06 | 2011-09-06 | Total reflection sound insulation structure |
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| CN2011102626533A CN102296716A (en) | 2011-09-06 | 2011-09-06 | Total reflection sound insulation structure |
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| CN102296716A true CN102296716A (en) | 2011-12-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106223502A (en) * | 2016-07-20 | 2016-12-14 | 无锡派乐科技有限公司 | A kind of environmental protection machine room |
| CN106703232A (en) * | 2016-11-02 | 2017-05-24 | 山西尚风抑风墙科技有限公司 | Sound shielding device and making process thereof |
| CN110924546A (en) * | 2019-12-10 | 2020-03-27 | 哈尔滨工程大学 | Inhale compound core plate structure of pressing from both sides of sound insulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110924546A (en) * | 2019-12-10 | 2020-03-27 | 哈尔滨工程大学 | Inhale compound core plate structure of pressing from both sides of sound insulation |
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Application publication date: 20111228 |