CN204229829U - Broadband compound sound-absorption structural - Google Patents
Broadband compound sound-absorption structural Download PDFInfo
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- CN204229829U CN204229829U CN201420758965.2U CN201420758965U CN204229829U CN 204229829 U CN204229829 U CN 204229829U CN 201420758965 U CN201420758965 U CN 201420758965U CN 204229829 U CN204229829 U CN 204229829U
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Abstract
The utility model relates to acoustic board technical field, discloses a kind of broadband compound sound-absorption structural, comprising: cover plate, base plate, sidewall and demarcation strip; Described cover plate and base plate relative spacing are arranged; Described sidewall connects described cover plate and sidewall, forms a back of the body chamber; Described cover plate is provided with multiple first perforation; Described demarcation strip is arranged in back of the body chamber, and fits tightly with the inwall of described cover plate, base plate and/or sidewall, and described back of the body chamber is separated into multiple absorption chamber; Each described absorption chamber is all bored a hole with described first and is communicated with.The utility model adopts cover plate, sidewall and base plate to form back of the body chamber, and uses demarcation strip that back of the body chamber is separated into multiple absorption chamber, and multiple absorption chamber forms resonance sound-absorbing system, the sound wave bandwidth that can absorb, and improves absorptive character, and structure is simple, is easy to processing.
Description
Technical field
The utility model relates to acoustic board technical field, particularly relates to a kind of broadband compound sound-absorption structural.
Background technology
Traditional perforated plate resonance absorption structure, its perforated plate has enclosed cavity behind each hole, is equivalent to " Helmholtz " resonator of many parallel connections, when incident wave frequency is consistent with the resonant frequency of system, namely produces resonance.Now, the vibration of the reciprocal air at perforated plate hole place, its amplitude reaches maximal value, and friction and damping also maximum, acoustic energy changes heat energy into because of viscous loss, and namely acoustic energy dissipation reaches maximum.This is the advantage of perforated plate resonance absorption structure.But this structure also has its intrinsic shortcoming, and its major defect is: the selectivity of frequency is strong, that is to say that its sound sucting band is narrow, only just can have good sound absorbing capabilities near resonant frequency, and off-resonance frequence, its acoustically effective is obviously deteriorated.Widen effective wide band sound absorption of individual layer porous plate acoustic adsorption device, a kind of method is the microperforated panel soundabsorbing construction adopting MULTILAYER COMPOSITE.But multi-layer compound structure significantly increases the complexity of structure, too increase material and cost simultaneously, in practical engineering application, be also subject to the restriction of space length.Another kind method places acoustic absorbant at the microperforated panel back side, but the acoustic absorbant increased can bring the secondary pollution of structure.Having is exactly reduce penetration hole diameter further again, according to the theory of Mr. Ma Dayou, when the penetration hole diameter of microperforated panel is less than 0.1 millimeter, is expected to the band limit reaching porous plate acoustic adsorption device.But Conventional machining methods cannot realize the processing of ultramicropore aperture microperforated panel, other job operations are as laser boring, and because of the increase of punch density, production cost also can increase greatly, are not suitable for batch production.
Utility model content
(1) technical matters that will solve
The purpose of this utility model is to provide a kind of broadband compound sound-absorption structural with wider acoustically effective, and structure is simple, is easy to processing.
(2) technical scheme
In order to solve the problems of the technologies described above, the utility model provides a kind of broadband compound sound-absorption structural, comprising: cover plate, base plate, sidewall and demarcation strip; Described cover plate and base plate relative spacing are arranged; Described sidewall connects described cover plate and sidewall, forms a back of the body chamber; Described cover plate is provided with multiple first perforation; Described demarcation strip is arranged in back of the body chamber, and fits tightly with the inwall of described cover plate, base plate and/or sidewall, and described back of the body chamber is separated into multiple absorption chamber; Each described absorption chamber is all bored a hole with described first and is communicated with.
Wherein, described absorption chamber is rectangular parallelepiped, right cylinder, centrum or irregular body.
Wherein, described cover plate is made up of porosint, membraneous material, sound absorption paper or textile material.
Wherein, described membraneous material is tygon or polypropylene.
Wherein, described porosint is metal foaming material or non-metal foam material.
Wherein, the shape of described cover plate is circular, square or sexangle.
Wherein, described first perforation is circular port, square opening, diamond hole, hex hole, fish scale shape hole, slotted eye, Shan slot apertures or profile hole.
Wherein, described sidewall is made up of metal material or nonmetallic materials.
Wherein, described base plate is made up of metal material or nonmetallic materials.
Wherein, the described demarcation strip of part is provided with multiple second perforation.
(3) beneficial effect
The broadband compound sound-absorption structural that the utility model provides, cover plate, sidewall and base plate is adopted to form back of the body chamber, and use demarcation strip that back of the body chamber is separated into multiple absorption chamber, multiple absorption chamber forms resonance sound-absorbing system, the sound wave bandwidth that can absorb, improve absorptive character, and structure is simple, is easy to processing.
Accompanying drawing explanation
Fig. 1 is the three-dimensional structure diagram (removing a sidewall) of the utility model embodiment;
Fig. 2 is the cut-open view along A-A direction in Fig. 1;
Fig. 3 is the Experimental Comparison figure of the broadband compound sound-absorption structural of the utility model embodiment and the compound sound-absorption structural of prior art.
In figure, 1: cover plate; 2: sidewall; 3: base plate; 4: demarcation strip; 5: absorption chamber; 10: back of the body chamber; 11: the first perforation; 41: the second perforation.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following instance for illustration of the utility model, but is not used for limiting scope of the present utility model.
With reference to shown in Fig. 1 and 2, broadband of the present utility model compound sound-absorption structural, comprising: cover plate 1, sidewall 2, base plate 3 and demarcation strip 4.Cover plate 1 is provided with multiple first perforation 11, and in the present embodiment, with reference to shown in Fig. 1, cover plate 1 adopts microperforated panel, and the first perforation 11 is micro-circular port.Cover plate 1 and base plate 3 relative spacing are arranged, and with reference to shown in Fig. 2, cover plate 1 and base plate 3 parallel setting.The xsect of sidewall is enclosed construction, and be preferably " O ", " mouth " or sphere of movements for the elephants shape structure, sidewall 2 connects cover plate 1 and sidewall 3, forms a back of the body chamber 10.The quantity of demarcation strip 4 is multiple, and the shape of demarcation strip 4 can be varied.Demarcation strip 4 is arranged in back of the body chamber 10, and fit tightly with the inwall of cover plate 1, base plate 3 and/or sidewall 2, back of the body chamber 10 is separated into multiple absorption chamber 5 by demarcation strip 4, the degree of depth of multiple absorption chamber 5 is incomplete same, and the degree of depth of absorption chamber 5 refers to medial surface and the innermost vertical height of absorption chamber of cover plate 1.With reference to shown in Fig. 2, back of the body chamber 10 is separated to form the absorption chamber 5 of the different depths such as two-chamber, three chambeies or multi-cavity.Absorption chamber 5 is rectangular parallelepiped, right cylinder, centrum or irregular body etc.Each absorption chamber 5 is all bored a hole with first and 11 to be communicated with, and sound wave flow into absorption chamber 5 from the first perforation 11, is absorbed by absorption chamber 5.
Preferably, cover plate 1 is made up of porosint, membraneous material, sound absorption paper or textile material.Wherein, membraneous material is tygon or polypropylene.Porosint is metal foaming material or non-metal foam material.
Preferably, the diameter of the first perforation 11 is 0.1 ~ 3mm, is preferably 0.1mm, 0.5mm, 0.8mm, 1mm, 3mm.The thickness of slab of cover plate 1 is 0.5 ~ 10mm, preferably adopts 0.5mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 10mm.The degree of depth in sound absorption back of the body chamber is 5 ~ 80mm, preferred 5mm, 10mm, 15mm, 20mm, 50mm, 80mm.
It should be noted that, base plate 3 and sidewall 2 can be served as by the solid metope of buildings, can form a closed back of the body chamber 10 together with cover plate 1.
Preferably, the depth of absorption chamber 5 distributes in order.With reference to shown in Fig. 1, the absorption chamber 5 li that the absorption chamber 5 that three degree of depth are different is set with successively or degree of depth is large accommodates the little absorption chamber of multiple degree of depth 5.
Preferably, the shape of cover plate 1 is circular, square, sexangle, ellipse or other shapes.
Preferably, sidewall 2, base plate 3 and demarcation strip 4 are made by metal material or nonmetallic materials.
Preferably, demarcation strip 4 also can be made up of porosint, membraneous material, sound absorption paper or textile material, and partial division plate 4 is provided with multiple second perforation 41.With reference to shown in Fig. 1, the more shallow absorption chamber 5 of the degree of depth completely by wave absorption, can not send sound wave to the darker absorption chamber of trial 5 by the second perforation 41, is absorbed completely by sound wave by darker absorption chamber 5.
It should be noted that, the first perforation 11 and the second perforation 41 can circular ports as described in above-described embodiment.Can also be square opening, diamond hole, hex hole, fish scale shape hole, slotted eye, Shan slot apertures or profile hole.
With reference to shown in Fig. 3, Fig. 3 shows the acoustical absorptivity comparison diagram of the sound absorption structure of broadband of the present utility model composite sound absorbing plate structure and prior art, and in experimentation, the trial of both back of the body chambers is 50mm.Wherein, B curve represents the acoustical absorptivity of prior art, and C curve represents the acoustical absorptivity of broadband of the present utility model composite sound absorbing plate structure, can find out that composite sound absorbing plate structure of the present utility model has wider acoustical absorptivity from Fig. 3 significantly.
The utility model adopts demarcation strip that back of the body chamber is separated to form multiple sound absorption chamber, and multiple sound absorption chamber forms resonator system, widens the wide band sound absorption of sound absorption structure.The utility model adds demarcation strip and back of the body chamber is separated into multiple absorption chamber, the degree of depth of multiple absorption chamber is incomplete same, be easy to processing, easy for installation, acoustically effective is good, eliminates the technique of on the cover board boring micropore, has saved processing cost, and the structure of absorption chamber does not have strict form restriction, has good dirigibility.Further, partial division plate has the second perforation, contributes to forming sound absorption structure that is double-deck or multilayer, can expand the wide band sound absorption of sound absorption structure further.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a broadband compound sound-absorption structural, is characterized in that, comprising: cover plate, base plate, sidewall and demarcation strip; Described cover plate and base plate relative spacing are arranged; Described sidewall connects described cover plate and sidewall, forms a back of the body chamber; Described cover plate is provided with multiple first perforation; Described demarcation strip is arranged in back of the body chamber, and fits tightly with the inwall of described cover plate, base plate and/or sidewall, and described back of the body chamber is separated into multiple absorption chamber; Each described absorption chamber is all bored a hole with described first and is communicated with.
2. broadband as claimed in claim 1 compound sound-absorption structural, it is characterized in that, described absorption chamber is rectangular parallelepiped, right cylinder, centrum or irregular body.
3. broadband as claimed in claim 1 compound sound-absorption structural, it is characterized in that, described cover plate is made up of porosint, membraneous material, sound absorption paper or textile material.
4. broadband as claimed in claim 3 compound sound-absorption structural, it is characterized in that, described membraneous material is tygon or polypropylene.
5. broadband as claimed in claim 3 compound sound-absorption structural, it is characterized in that, described porosint is metal foaming material or non-metal foam material.
6. broadband as claimed in claim 1 compound sound-absorption structural, it is characterized in that, the shape of described cover plate is circular, square or sexangle.
7. broadband as claimed in claim 1 compound sound-absorption structural, is characterized in that, described first perforation is circular port, square opening, diamond hole, hex hole, fish scale shape hole, slotted eye, Shan slot apertures or profile hole.
8. broadband as claimed in claim 1 compound sound-absorption structural, it is characterized in that, described sidewall is made up of metal material or nonmetallic materials.
9. broadband as claimed in claim 1 compound sound-absorption structural, it is characterized in that, described base plate is made up of metal material or nonmetallic materials.
10. broadband as claimed in claim 1 compound sound-absorption structural, is characterized in that, the described demarcation strip of part is provided with multiple second perforation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420758965.2U CN204229829U (en) | 2014-12-04 | 2014-12-04 | Broadband compound sound-absorption structural |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420758965.2U CN204229829U (en) | 2014-12-04 | 2014-12-04 | Broadband compound sound-absorption structural |
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| CN204229829U true CN204229829U (en) | 2015-03-25 |
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| CN201420758965.2U Active CN204229829U (en) | 2014-12-04 | 2014-12-04 | Broadband compound sound-absorption structural |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107816595A (en) * | 2017-12-13 | 2018-03-20 | 武汉理工大学 | A kind of not even depth back of the body chamber micropunch muffler pipe in parallel |
| CN109192190A (en) * | 2018-09-19 | 2019-01-11 | 中国人民解放军国防科技大学 | Thin-layer metamaterial sound absorption structure |
| CN109707596A (en) * | 2018-11-16 | 2019-05-03 | 青岛海尔股份有限公司 | Silencing means and refrigerator with it |
| CN111391581A (en) * | 2020-04-02 | 2020-07-10 | 合肥工业大学 | Cavity noise reduction structure made of light flexible material and application thereof |
| CN113846764A (en) * | 2021-11-29 | 2021-12-28 | 北京市科学技术研究院城市安全与环境科学研究所 | Separate perforation type square tube space sound absorber |
-
2014
- 2014-12-04 CN CN201420758965.2U patent/CN204229829U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107816595A (en) * | 2017-12-13 | 2018-03-20 | 武汉理工大学 | A kind of not even depth back of the body chamber micropunch muffler pipe in parallel |
| CN107816595B (en) * | 2017-12-13 | 2024-04-09 | 武汉理工大学 | Parallel unequal-depth sub-back cavity micro-perforated pipe muffler |
| CN109192190A (en) * | 2018-09-19 | 2019-01-11 | 中国人民解放军国防科技大学 | Thin-layer metamaterial sound absorption structure |
| CN109192190B (en) * | 2018-09-19 | 2020-05-08 | 中国人民解放军国防科技大学 | Thin-layer metamaterial sound absorption structure |
| CN109707596A (en) * | 2018-11-16 | 2019-05-03 | 青岛海尔股份有限公司 | Silencing means and refrigerator with it |
| CN111391581A (en) * | 2020-04-02 | 2020-07-10 | 合肥工业大学 | Cavity noise reduction structure made of light flexible material and application thereof |
| CN113846764A (en) * | 2021-11-29 | 2021-12-28 | 北京市科学技术研究院城市安全与环境科学研究所 | Separate perforation type square tube space sound absorber |
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