CN211957114U - Wedge resonance sound absorption device - Google Patents
Wedge resonance sound absorption device Download PDFInfo
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- CN211957114U CN211957114U CN202020406654.5U CN202020406654U CN211957114U CN 211957114 U CN211957114 U CN 211957114U CN 202020406654 U CN202020406654 U CN 202020406654U CN 211957114 U CN211957114 U CN 211957114U
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Abstract
The utility model discloses a wedge resonance sound absorption device, include: the wedge body comprises a base body formed by stretching a triangular section, a sound absorption material wrapping the base body and a protective surface fixed on the periphery of the sound absorption material, wherein the tip of the base body faces the tip of the wedge body and extends along the tip of the wedge body, and a first resonant cavity is arranged inside the base body; the base is fixed on the bottom surface of the wedge body, a second resonant cavity is arranged in the base, and the resonant frequency of the second resonant cavity is different from that of the first resonant cavity. Through the utility model discloses the scheme is filled the resonant frequency of second resonant cavity and is caved in with wedge sound absorption coefficient between the cut-off frequency by first resonant cavity, and the low frequency sound wave walks around the base member very easily moreover and diffracts the rear, makes the striking of surplus sound wave behind the second resonant cavity, forms the resonance sound absorption of corresponding low frequency, realizes holistic sound absorption effect more than the low frequency cut-off frequency.
Description
Technical Field
The utility model relates to an interior acoustics fitment technical field especially relates to a wedge resonance sound absorbing device.
Background
The sound absorption wedge is mainly applied to the construction of an anechoic chamber, and can realize gradual transition of acoustic impedance between air and sound absorption materials, so that good impedance matching and sound absorption effects are obtained. The application of the acoustic wedge to the anechoic chamber thus enables the sound waves incident thereon to be absorbed in their entirety almost without reflection. Conventional acoustic wedges are designed according to the 1/4 wavelength theory for acoustic structures. For example, a wedge absorber of 85cm length can meet the sound absorption requirement of the anechoic chamber with the cut-off frequency of 100 Hz; the sound absorption wedge of 135cm can meet the sound absorption requirement of the cut-off frequency of 63Hz of the sound absorption chamber. However, for these wedges to cut frequencies below 100Hz, it is difficult for the average laboratory to provide sufficient building space, especially in the height direction.
At present, the processing method in the industry is to increase the sound absorption coefficient of 100Hz or less by adding a resonant sound absorption structure, so as to meet the requirements of the laboratory on the cut-off frequency of low frequency as much as possible, for example, adding a resonant cavity on the bottom surface of a wedge. However, due to the fact that the frequency bandwidth of the resonant cavity is insufficient, the sound absorption coefficient between the resonant frequency and the wedge cut-off frequency is concave, and part of the intermediate frequency cannot meet the requirement of the sound absorption coefficient, for example, the wedge cut-off frequency is 100Hz, and the resonant frequency of the resonant cavity is 63Hz, so that the sound absorption effect of the structure on the intermediate 80Hz frequency is poor.
In order to solve the above problems, a patent with publication number CN102682759 proposes a multi-layer sound-absorbing wedge with a resonance sound-absorbing structure, in which a wedge body is composed of a plurality of layers of sound-absorbing structures with characteristic impedance and sectional area gradually changing from small to large. However, when the number of stacked layers of sound-absorbing materials is large, sound energy hardly enters the bottom layer, so that the effect of the bottom layer resonant cavity is hardly exerted to the maximum.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a wedge resonance sound absorption device for among the solution prior art, the relatively poor problem of holistic sound absorption effect above the low frequency cut-off frequency.
In order to solve the above problem, the utility model adopts the following technical scheme:
there is provided a wedge resonance sound absorption apparatus, including:
the wedge body comprises a base body formed by stretching a triangular section, a sound absorption material wrapping the base body and a protective surface fixed on the periphery of the sound absorption material, wherein the tip of the base body faces the tip of the wedge body and extends along the tip of the wedge body, and a first resonant cavity is arranged inside the base body;
the base is fixed on the bottom surface of the wedge body, a second resonant cavity is arranged in the base, and the resonant frequency of the second resonant cavity is different from that of the first resonant cavity.
Optionally, the resonant frequency of the first resonant cavity is 63 Hz.
Optionally, the substrate is surrounded by a steel plate.
Optionally, the resonance frequency of the second resonant cavity is 80 Hz.
Optionally, the base is surrounded by steel plates, and the thickness of each steel plate of the base is 1-2 mm.
Optionally, the thickness of the sound absorption material on the bottom surface of the base body is 5-10 cm.
Optionally, the thickness of the sound-absorbing material on the side of the base is not less than 10cm, and the thickness of the sound-absorbing material on the tip of the base is not less than 30 cm.
Optionally, a plurality of damping pads are arranged between the base and the wedge body, and each damping pad is respectively arranged at a corner position of the base.
Optionally, the sound absorption material is at least one of glass wool, rock wool, polyester fiber wool and melamine wool.
Optionally, the sum of the length of the wedge body and the thickness of the base is 85 cm.
The utility model discloses a technical scheme can reach following beneficial effect:
in the wedge resonance sound absorption device, two resonant cavities, namely a first resonant cavity and a second resonant cavity, are arranged, so that the wedge resonance sound absorption device can have two different resonant frequencies, when the resonant frequency of the second resonant cavity is set to be 63Hz, for example, the resonant frequency of the first resonant cavity can be set to be 80Hz, and thus, a sound absorption coefficient recess between the resonant frequency of the second resonant cavity and the cut-off frequency of the wedge can be filled by the first resonant cavity; and the substrate is of a triangular structure, and does not form strong reflection on the sound incident perpendicular to the wedge body, so that low-frequency sound waves easily bypass the substrate and are diffracted to the rear, and the residual sound waves collide with the second resonant cavity to form corresponding low-frequency resonance sound absorption, so that the second resonant cavity can exert the maximum resonance effect as far as possible.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof of the present invention explain the present invention and do not form an improper limitation to the present invention. In the drawings:
fig. 1 is a schematic perspective view of a wedge resonance sound absorption device disclosed in an embodiment of the present invention;
fig. 2 is a schematic side view of a wedge resonance sound absorption device disclosed in an embodiment of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
fig. 4 is a schematic structural view of the base with the damping pad according to the embodiment of the present invention.
Wherein the following reference numerals are specifically included in figures 1-4:
a wedge body-1; a base-2; a damping pad-3; a substrate-11; sound-absorbing material-12; face guard-13; a first resonant cavity-111; a second resonant cavity-21.
Detailed Description
To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1 to 3 (wherein the arrow in fig. 1 indicates the incident direction of the sound energy), the wedge resonance sound absorption device of the present invention includes a wedge body 1 and a base 2. Wedge body 1 includes base 11, sound absorbing material 12 of parcel base 11 and fixes visor 13 at sound absorbing material 12 periphery. The base body 11 is formed by stretching a triangular section, the tip of the base body 11 faces the tip of the wedge body 1 and the tip of the base body 11 extends along the tip of the wedge body 1, and a first resonant cavity 111 is arranged inside the base body 11. The base 2 is fixed on the bottom surface of the wedge body 1, and a second resonant cavity 21 is arranged in the base 2, and the resonant frequency of the second resonant cavity 21 is different from the resonant frequency of the first resonant cavity 111.
In the wedge resonance sound absorption device, two resonant cavities are provided, so that the wedge resonance sound absorption device can have two different resonant frequencies, for example, when the resonant frequency of the second resonant cavity 21 is set to 63Hz, the resonant frequency of the first resonant cavity 111 can be set to 80Hz, so that the sound absorption coefficient depression between the resonant frequency of the second resonant cavity 21 and the wedge cut-off frequency can be filled by the first resonant cavity 111, and the wedge resonance sound absorption device with the length of 85cm (the size from the tip to the bottom surface of the wedge body 1) can realize the use effect of the 63Hz cut-off frequency, and is convenient to install in a sound absorption chamber; and the substrate 11 is in a triangular structure, and does not form strong reflection to the sound incident perpendicular to the wedge body 1, so that the low-frequency sound waves easily bypass the substrate 11 and diffract to the rear, and the rest sound waves collide with the second resonant cavity 21 to form corresponding low-frequency resonance sound absorption, so that the second resonant cavity 21 can exert the maximum resonance effect as much as possible, and the whole sound absorption effect above the low-frequency cut-off frequency is realized.
The substrate 11 may be formed by a steel plate, that is, the steel plate encloses the first resonant cavity 111, the steel plate has a high density and a heavy unit mass, so that the space can be saved, and the possibility of providing the first resonant cavity 111 in the wedge body 1 is provided. The thickness of the steel plate and the volume of the chamber can be calculated from the resonance frequency of the first resonance chamber 111 (for example, the resonance frequency is set to 80 Hz).
The sound absorption material 12 can be at least one of glass wool, rock wool, polyester fiber cotton, melamine cotton and the like, and the sound absorption materials 12 have good sound absorption effect and low cost. The thickness of the sound-absorbing material 12 located on the bottom surface of the base 11 (i.e., between the base 11 and the base 2) may be 5-10 cm. The thickness of the sound absorbing material 12 on the side of the base 11 is not less than 10 cm. The thickness of the sound-absorbing material 12 at the tip of the base 11 is not less than 30 cm. So set up, can guarantee wedge body 1's basic sound absorption characteristic under the prerequisite of the length (the size of wedge body 1 pointed end to the bottom surface promptly) that effectively reduces wedge body 1.
The facing 13 may be a perforated steel plate, a cloth, or a polyester fiber plate, etc., to achieve the shaping of the sound absorbing material 12.
The assembling mode of the wedge body 1 is that the protective surface 13 is firstly processed into a required structure, then the tip of the protective surface 13 is filled with the sound-absorbing material 12, then the matrix 11 is placed in the protective surface 13, the sound-absorbing material 12 is filled around the matrix 11, and finally the protective surface 13 on the bottom surface of the wedge body 1 is fixed with the protective surface 13 on the side surface, so that the assembling of the wedge body 1 is completed.
The base 2 is the rectangle, is enclosed by the steel sheet, and each face steel sheet thickness of base 2 is 1~2mm to reduce the thickness of base 2 as far as possible (along the size of sharp-pointed end to the bottom surface of wedge body 1 promptly). As shown in fig. 4, a plurality of damping pads 3 can be arranged between the base 2 and the wedge body 1, each damping pad 3 is located at each corner position of the base 2, the base 2 and the wedge body 1 are separated by the damping pad 3, and the influence of the base 2 on the degree of freedom of the wedge body 1 in the direction from the tip to the bottom surface due to the large-area contact of the base 2 and the wedge body 1 is avoided. The damping pad 3 may be a rubber pad or a polyester fiber board.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.
Claims (10)
1. A wedge resonance sound absorption device, comprising:
the wedge body comprises a base body formed by stretching a triangular section, a sound absorption material wrapping the base body and a protective surface fixed on the periphery of the sound absorption material, wherein the tip of the base body faces the tip of the wedge body and extends along the tip of the wedge body, and a first resonant cavity is arranged inside the base body;
the base is fixed on the bottom surface of the wedge body, a second resonant cavity is arranged in the base, and the resonant frequency of the second resonant cavity is different from that of the first resonant cavity.
2. The wedge resonance sound absorbing device according to claim 1, wherein the resonance frequency of the first resonance chamber is 63 Hz.
3. The wedge resonance sound absorbing device as set forth in claim 1, wherein said matrix is surrounded by a steel plate.
4. The wedge resonance sound absorbing device according to claim 1, wherein the resonance frequency of the second resonance cavity is 80 Hz.
5. The wedge resonance sound absorption device according to claim 4, wherein the base is formed by surrounding steel plates, and the thickness of each steel plate of the base is 1-2 mm.
6. The wedge resonance sound absorption apparatus as set forth in any one of claims 1 to 5, wherein the thickness of the sound absorption material on the bottom surface of the base is 5 to 10 cm.
7. The wedge resonance sound absorbing device according to any one of claims 1 to 5, wherein the thickness of the sound absorbing material located at the side of the base is not less than 10cm, and the thickness of the sound absorbing material located at the tip of the base is not less than 30 cm.
8. The wedge resonance sound absorption device according to any one of claims 1 to 5, wherein a plurality of damping pads are disposed between the base and the wedge body, and each damping pad is disposed at a corner position of the base.
9. The wedge resonator sound absorption device according to any one of claims 1 to 5, wherein the sound absorption material is at least one of glass wool, rock wool, polyester fiber wool, and melamine wool.
10. The wedge resonance sound absorbing device according to any one of claims 1 to 5, wherein the sum of the length of the wedge body and the thickness of the base is 85 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020406654.5U CN211957114U (en) | 2020-03-26 | 2020-03-26 | Wedge resonance sound absorption device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020406654.5U CN211957114U (en) | 2020-03-26 | 2020-03-26 | Wedge resonance sound absorption device |
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| Publication Number | Publication Date |
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| CN211957114U true CN211957114U (en) | 2020-11-17 |
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| CN202020406654.5U Active CN211957114U (en) | 2020-03-26 | 2020-03-26 | Wedge resonance sound absorption device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117329173A (en) * | 2023-12-01 | 2024-01-02 | 南京磁谷科技股份有限公司 | Air inlet noise reduction device of high-speed centrifugal compressor |
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2020
- 2020-03-26 CN CN202020406654.5U patent/CN211957114U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117329173A (en) * | 2023-12-01 | 2024-01-02 | 南京磁谷科技股份有限公司 | Air inlet noise reduction device of high-speed centrifugal compressor |
| CN117329173B (en) * | 2023-12-01 | 2024-04-12 | 南京磁谷科技股份有限公司 | Air inlet noise reduction device of high-speed centrifugal compressor |
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