CN212587216U - A multi-layer micro-perforated plate sound-absorbing structure - Google Patents
A multi-layer micro-perforated plate sound-absorbing structure Download PDFInfo
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- CN212587216U CN212587216U CN202020392182.2U CN202020392182U CN212587216U CN 212587216 U CN212587216 U CN 212587216U CN 202020392182 U CN202020392182 U CN 202020392182U CN 212587216 U CN212587216 U CN 212587216U
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Abstract
The utility model discloses a multilayer microperforated panel sound-absorbing structure, including framework and the microperforated panel that sets up at the interval in proper order to and enclose the sound absorption cavity that closes and form by framework and microperforated panel. The frame is a hollow right-angle hexahedron, and the microperforated panel is a right-angle hexahedron sheet. The total thickness of the frame body is 30-100 mm. The surface of the micro-perforated plate is uniformly distributed with through holes. The cross section of the through hole is circular or quadrilateral, and the size of the through hole is 0.1-1.0 mm. The perforation rate of the microperforated plate is 1.0-15.0%. The thickness of the micro-perforated plate is 0.1-1.0 mm. The number of the micro-perforated plates is 2-6. The depth of the sound absorption cavity is 5-60 mm. One side of the frame body is provided with a groove, and the other side of the frame body is provided with a bulge. The groove is matched with the adjacent bulge and used for determining the position of the micro-perforated plate in the frame body and fixing the micro-perforated plate. The utility model discloses the quality is light, and surface density is little, and full frequency channel sound absorption coefficient is high, and especially low frequency sound absorption performance is better.
Description
Technical Field
The utility model relates to a sound-absorbing structure field specifically is a multilayer microperforated panel sound-absorbing structure.
Background
The perforated plate has wide application in daily life, can be used as a decorative plate and also can be used as a panel of porous sound-absorbing material to enhance the low-frequency sound-absorbing performance. The sound absorption coefficient of a conventional perforated plate is about 0.16, and the sound absorption bandwidth of the structure is narrow, generally only a few tens of hertz to a few hundred hertz, because the sound resistance of the perforated plate is small. Compared with the traditional perforated plate, the plate thickness of the sound absorption structure of the micro-perforated plate is generally less than 2mm, the perforation diameters are all less than 1mm, and the perforation rate is less than 15%. Due to the structural characteristics of the micro-perforated plate, good sound absorption performance can be obtained under the condition that a porous sound absorption material is not added, and the sound absorption frequency is mainly concentrated in a middle-high frequency range. Meanwhile, the sound absorption structure of the micro-perforated plate has the characteristics of simple structure, light weight, severe working condition resistance, washability and the like, and is widely applied to the fields of buildings and industry.
At present, the existing micropunch plate is generally used for silencing a pipeline and a silencer, the sound absorption frequency is generally 2-4 kHz, and the average sound absorption coefficient in a frequency band is about 0.7. For example, chinese patent application No. 201880042825.6 discloses a microperforated pipe comprising a first segment and a second segment; the first section is tubular and substantially non-perforated, and the second section is partially microperforated and connected in series with the first section. The outer wall of the pipeline is wrapped with one or more sound insulation materials of a fiber material layer, a foam layer and a particle layer. But the structure is mainly used for isolating noise, and the overall sound absorption performance is general. The Chinese patent with the application number of 201820991506.7 discloses a local perforated plate silencing unit, a combined perforated plate silencing unit, a composite silencing sheet, a composite silencing device and a pipeline system, wherein the local perforated plate silencing unit comprises a bottom plate, a side plate and a local perforated plate. The local perforated plate and the bottom plate are symmetrically arranged, the side plates surround between the local perforated plate and the bottom plate to form a silencing cavity together, and sound absorbing materials are filled in the cavity. However, the local perforated plate noise elimination unit is generally used for controlling low-frequency noise (0.1-1 kHz), and the sound absorption frequency band is narrow; if broadband noise control is to be achieved, a local perforated plate silencing unit array is needed, and a porous sound absorption material is additionally arranged, so that the traditional sound absorption material is short in service life and poor in environmental resistance. Chinese patent application No. 201910909756.0 discloses a novel microperforated panel muffler with barbed triangular microperforations, which comprises a housing and an inner microperforated panel. The number of the micro-perforated plates is two, and the micro-perforated plates are symmetrically arranged by taking the central line of the shell in the vertical direction as a symmetry axis. The distance between the two micro-perforated plates and the adjacent side of the shell is regulated and controlled simultaneously to achieve silencing of different volumes and audio noises. However, the structure is complex, and the noise-absorbing structure only has a relatively high noise-absorbing effect on noise within a certain range, so that the full-band sound-absorbing structure is general in sound-absorbing performance. In view of this, it is very important to develop a high-efficiency broadband sound absorption and insulation structure for noise control and noise pollution control.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects existing in the prior art, the utility model aims to provide a multilayer micro-perforated plate sound absorption structure for sound absorption and sound insulation.
The technical scheme is as follows: a multilayer microperforated panel sound-absorbing structure, including framework and the microperforated panel that sets up at the interval in proper order to and enclose the sound absorption cavity that closes and form by framework and microperforated panel.
One side of the frame body is provided with a groove, and the other side of the frame body is provided with a bulge. The groove is matched with the adjacent bulge and used for determining the position of the micro-perforated plate in the frame body and fixing the micro-perforated plate. The frame body is a hollow rectangular hexahedron, the total thickness of the frame body is 30-100 mm, and the frame body is divided into the following four specifications: 30mm, 50mm, 80mm, 100 mm. The main functions of the frame body are as follows: determining the position of the micro-perforated plate in the frame; the micro-perforated plate is supported and fixed; forming a desired sound absorbing cavity; when the multiple layers of micro-perforated plates are connected in series, the splicing and fixing functions are realized.
The number of the micro-perforated plates is 2-6. The thickness of the micro-perforated plate is 0.1-1.0 mm. The surface of the micro-perforated plate is uniformly distributed with through holes. The cross section of the through hole is circular or quadrilateral, the diameter of the circular through hole is 0.1-1.0 mm, and the side length of the quadrilateral through hole is 0.1-1.0 mm. The perforation rate of the microperforated plate is 1.0-15.0%. The depth of the sound absorption cavity is 5-60 mm.
The working principle is as follows: when sound waves enter the interface, due to the combined action of the frame body and the micro-perforated plate, a part of the sound waves are reflected, so that transmitted sound energy is weakened, and the sound insulation performance of the sound absorption structure of the multi-layer micro-perforated plate is improved. A part of sound waves enter the micro-perforated plate along the incident direction, resonance is generated when the incident wavelength is matched with the acoustic impedance of the micro-perforated plate, the sound waves oscillate in the micro-holes and the cavity, and the sound energy is consumed (absorbed) by overcoming the frictional resistance, so that the sound absorption effect is achieved; meanwhile, when sound waves enter the sound absorption cavity from the micropores, a part of sound energy is consumed (absorbed) due to friction and hot adhesion effects between the sound waves and the hole wall, so that the sound absorption performance of the whole structure is improved. Generally, a single-layer micro-perforated plate corresponds to one eigenfrequency, periodic resonance sound absorption peaks are generated, and the fluctuation of a sound absorption curve is large. But due to the coupling effect among the multiple layers of micro perforated plates, a plurality of coupling resonance sound absorption peaks are generated, the sound absorption frequency range is widened, and the sound absorption curve is relatively flat. In addition, the sound insulation performance of the whole sound absorption structure of the multilayer micro-perforated plate can be improved by increasing the low-frequency sound absorption coefficient of the structure.
The sound absorption performance of the sound absorption structure of the multilayer micro-perforated plate is related to the thickness, the perforation size, the perforation rate and the cavity depth of the micro-perforated plate, and the sound absorption coefficient and the frequency range of the sound absorption structure of the multilayer micro-perforated plate are adjusted by changing the structural parameters. The sound insulation performance (especially the low-frequency sound insulation performance) of the sound absorption structure of the multilayer micro-perforated plate is related to the sound absorption coefficient of the sound absorption structure, and the sound insulation performance of the whole sound absorption structure of the multilayer micro-perforated plate is improved by increasing the sound absorption coefficient of the structure.
Has the advantages that: compared with the prior art, the utility model, have following saliency characteristics:
1. the hollow rectangular hexahedron sandwich structure has light weight and small surface density;
2. sound absorption materials are not needed, the sound absorption coefficient in a frequency band is high, the integral sound absorption performance is good, and particularly, the low-frequency sound absorption performance is good;
3. the sound absorption coefficient of the structure is increased to improve the overall sound insulation performance of the structure, and the low-frequency sound insulation performance of the multilayer micro-perforated plate sound absorption structure is good.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is an exploded view of the present invention;
fig. 3 is a schematic structural view of the frame body 1 of the present invention;
fig. 4 is a partial enlarged view of the utility model at a;
fig. 5 is a schematic structural view of the microperforated panel 2 of the present invention;
fig. 6 is a partial enlarged view of the utility model at the position B;
fig. 7 is a sound absorption characteristic curve of the present invention;
fig. 8 is a transmission loss spectrum curve of the present invention.
Detailed Description
The directions of the drawings in the specification are up, down, left and right.
As shown in fig. 1, the sound absorption structure of the multi-layer micro-perforated plate comprises five frame bodies 1 and four micro-perforated plates 2 which are sequentially arranged in series at intervals, and four sound absorption cavities 3 enclosed by the frame bodies.
As shown in FIG. 2, the first frame 1 has an outer dimension of 4mm (W) x 200mm (D) x 300mm (H) and an inner dimension of 4mm (W ') x 192mm (D ') x 292mm (H ') from left to right, and is connected to the second frame 1 to fix the first microperforated plate 2. The second frame 1 has an outer dimension of 23.5mm (W) x 200mm (D) x 300mm (H) and an inner dimension of 23.5mm (W ') x 192mm (D ') x 292mm (H '), one end of which is connected to the first frame 1, supports the first microperforated plate 2, determines its position in the second frame 1, andforming a desired sound-absorbing cavity 3(Dc ═ 21 mm); the other end is connected with a third frame body 1 and plays a role in fixing a second micro-perforated plate 2. The third frame 1 has an outer dimension of 27.5mm (W) × 200mm (D) × 300mm (H) and an inner dimension of 27.5mm (W ') × 0192mm (D ') × 1292mm (H '), and one end is connected to the second frame 1, and supports the second microperforated plate 2, determines its position in the third frame 1, and forms the desired sound-absorbing cavity 3(Dc 25 mm); the other end is connected with the fourth frame body 1 and plays a fixed role in the third micro-perforated plate 2. The outer dimension of the fourth frame 1 is 11.5mm (W) x 200mm (D) x 300mm (H), the inner dimension is 11.5mm (W ') x192 mm (D ') x292 mm (H '), one end is connected with the third frame 1, and the third microperforated plate 2 is supported, the position of the microperforated plate in the fourth frame 1 is determined, and a required sound absorption cavity 3 is formed (Dc ═ 9 mm); the other end is connected with the fifth frame body 1 and plays a role in fixing the fourth micro-perforated plate 2. The fifth frame body 1 had an outer dimension of 29.5mm (W) X200 mm (D) X300 mm (H) and an inner dimension of 27.5mm (W ') X192 mm (D ') X292 mm (H '). One side of the fifth frame 1 is connected to the fourth frame 1, and supports the fourth microperforated panel 2, determines its position in the fifth frame 1, and forms a desired sound-absorbing chamber 3 (D)c＝25mm)；
From left to right, the outer dimension of the first microperforated plate 2 was 0.32mm (t) × 196mm (d) × 296mm (h), fine circular through holes were uniformly distributed on the surface, the diameter d of each through hole was 0.1mm, and the perforation rate δ was 8.7%. The second microperforated plate 2 had an outer dimension of 0.32mm (t) x 196mm (d) x 296mm (h), and fine circular through-holes were uniformly distributed on the surface, and had a through-hole diameter d of 0.1mm and a perforation rate δ of 4.9%. The third microperforated plate 2 had an outer dimension of 0.32mm (t) × 196mm (d) × 296mm (h), and fine circular through-holes were uniformly distributed on the surface, and had a through-hole diameter d of 0.8mm and a perforation rate δ of 2.7%. The fourth microperforated plate 2 had an outer dimension of 0.32mm (t) x 196mm (d) x 296mm (h), and fine circular through-holes were uniformly distributed on the surface, and had a through-hole diameter d of 0.1mm and a perforation rate δ of 2.2%.
As shown in fig. 3 to 4, the frame 1 is a rectangular hexahedral frame. One side of the frame body 1 is provided with a groove 4, the other side of the frame body is provided with a protrusion 5, and the groove 4 is matched with the protrusion 5 in structural size and used for determining the position of the micro-perforated plate 2 in the frame body 1 and fixing the micro-perforated plate.
As shown in fig. 5 to 6, the micro-perforated plate 2 is formed by etching a copper plate, is a rectangular hexahedron sheet in shape, is uniformly distributed with micro-circular through holes on the surface, and is combined with the board rear sound absorption cavity 3 to form the sound absorption structure of the micro-perforated plate.
Referring to fig. 7 to 8, the sound absorption characteristic and transmission loss finite element simulation analysis is performed on the sound absorption structure of the multilayer micro-perforated plate. As can be seen from the figure, the sound absorption performance of the whole sound absorption structure of the multilayer micro-perforated plate is good, and the average sound absorption coefficient of the structure in the frequency band of 0.1-5 kHz is about 0.92; meanwhile, the sound insulation performance of the sound absorption structure of the multilayer micro-perforated plate is good, and the average sound insulation quantity of the structure in a frequency band of 0.1-5 kHz is about 80 dB.
Be used for hotel guest room noise control with the multilayer micro perforated plate sound absorbing structure of this embodiment, replace current sound absorbing layer with multilayer micro perforated plate sound absorbing structure, multilayer micro perforated plate 2's full frequency channel sound absorption coefficient is higher, holistic sound absorption performance, especially low frequency sound absorption performance is better. On the basis of not increasing the whole thickness, reach the purpose that improves wall body low frequency sound insulation performance through the sound absorption performance that improves microperforated panel 2, can give better experience of living in of customer.
Claims (9)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111276116A (en) * | 2020-03-24 | 2020-06-12 | 南京大学 | A multi-layer micro-perforated plate sound-absorbing structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111276116A (en) * | 2020-03-24 | 2020-06-12 | 南京大学 | A multi-layer micro-perforated plate sound-absorbing structure |
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Effective date of registration: 20250625 Address after: Room 101, Building 23 (Building 1, Smart Park), Nanda Science Park, No. 8, Yuanhua Road, Xianlin Street, Qixia District, Nanjing, 210000, Jiangsu Province Patentee after: Nanjing Huaqin Photoacoustic Technology Co.,Ltd. Country or region after: China Address before: 210000 Nanjing, Gulou District, Jiangsu, No. 22 Hankou Road Patentee before: NANJING University Country or region before: China Patentee before: NANJING GUANGSHENG SUPERSTRUCTURE MATERIALS RESEARCH INSTITUTE Co.,Ltd. |