CN218181825U - Low-frequency broadband sound absorption device - Google Patents
Low-frequency broadband sound absorption device Download PDFInfo
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- CN218181825U CN218181825U CN202222373781.1U CN202222373781U CN218181825U CN 218181825 U CN218181825 U CN 218181825U CN 202222373781 U CN202222373781 U CN 202222373781U CN 218181825 U CN218181825 U CN 218181825U
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Abstract
The utility model provides a low frequency broadband sound absorbing device, include two at least sound absorption modules that set up along the first direction. The at least two sound absorption modules comprise a first sound absorption module and a second sound absorption module, wherein the first sound absorption module comprises at least one first sound absorption unit, the second sound absorption module comprises at least one second sound absorption unit, the first sound absorption unit comprises a first resonance cavity member, a first resonance cavity is arranged in the first resonance cavity member, the outer side surface of the first resonance cavity member along the first direction is a sound absorption surface, and the sound absorption surface is provided with a first sound absorption hole. The second sound absorption unit comprises a second resonant cavity member, the second resonant cavity member is connected to the first resonant cavity member along the first direction and located on the other side opposite to the sound absorption surface, a second resonant cavity is arranged in the second resonant cavity member, the second resonant cavity is isolated from the first resonant cavity, the second resonant cavity member is provided with a second sound absorption hole, and the second sound absorption hole is communicated with the second resonant cavity and the outer side of the sound absorption surface.
Description
Technical Field
The utility model relates to a technical field of equipment of making an uproar falls in the sound absorption, more specifically relates to a low frequency broadband sound absorbing device.
Background
In a noise control engineering project, in order to overcome the problem that a porous sound absorbing material is poor in low-frequency sound absorbing performance, helmholtz resonators, film sound absorbing structures, micro-perforated plate sound absorbing structures, and the like are often used as low-frequency sound absorbing structures. However, the sound absorption structures all have the inherent defect of narrow sound absorption frequency band in a low frequency range, and cannot meet the noise reduction requirement of low-frequency broadband sound absorption.
In the related art, a plurality of Helmholtz resonator type sound absorption units or other forms of resonance sound absorption units are simply connected in parallel to form a sound absorption structure, so that the sound absorption frequency band of the sound absorption structure can be properly widened. However, this design can achieve better effects in the medium and high frequency range, but not in the low frequency range. The increase of the number of the sound absorption units causes the occupied area proportion of each sound absorption unit in the whole sound absorption structure to be reduced, so that the sound absorption frequency band corresponding to the corresponding sound absorption unit is narrowed, and the effect of widening the sound absorption frequency band generated by the increase of the number of the sound absorption units is counteracted.
Accordingly, there is a need to provide a low frequency broadband sound absorbing device to at least partially address the above-mentioned problems.
SUMMERY OF THE UTILITY MODEL
A series of concepts in a simplified form are introduced in the summary section, which will be described in further detail in the detailed description section. The inventive content of the present application does not imply any attempt to define the essential features and characteristics of the claimed solution, nor does it imply any attempt to determine the scope of the claimed solution.
For at least partly solving the above-mentioned problem, the utility model provides a low frequency broadband sound absorbing device, low frequency broadband sound absorbing device includes:
the sound absorption module comprises at least two sound absorption modules arranged along a first direction, wherein the at least two sound absorption modules comprise a first sound absorption module and a second sound absorption module;
the first sound absorption module comprises at least one first sound absorption unit, the first sound absorption unit comprises a first resonant cavity member, a first resonant cavity is arranged in the first resonant cavity member, the outer side surface of the first resonant cavity member along the first direction is a sound absorption surface, and the sound absorption surface is provided with a first sound absorption hole;
the second sound absorption module comprises at least one second sound absorption unit comprising a second resonance chamber member connected to the first resonance chamber member in the first direction and located on the other side opposite to the sound absorption surface, the second resonance chamber member having a second resonance chamber therein, the second resonance chamber being isolated from the first resonance chamber, the second resonance chamber member being provided with a second sound absorption hole communicating the second resonance chamber and the outside of the sound absorption surface.
Optionally, the first sound absorption module comprises two or more first sound absorption units arranged in parallel.
Optionally, the second sound absorption module comprises two or more of the second sound absorption units arranged in parallel.
Optionally, the first sound absorbing unit comprises a first insertion tube disposed to the first sound absorbing hole and flush with the sound absorbing surface;
the first cannula extends at least partially into the first resonant cavity and communicates the first resonant cavity with the exterior side of the sound absorbing surface.
Optionally, a through hole communicated with the first resonance cavity is formed in the surface of the first cannula extending into the first resonance cavity; and/or
The first cannula is a straight tube, an L-shaped tube or a U-shaped tube.
Optionally, the second sound absorbing unit comprises a second cannula provided to the second sound absorbing hole and extending at least partially into the second resonance chamber and communicating the second resonance chamber with the outside of the sound absorbing surface,
the second cannula is connected to and flush with the sound absorbing surface.
Optionally, a through hole communicated with the second resonant cavity is arranged on the surface of the second cannula extending into the second resonant cavity; and/or
The second inserting pipe is a straight pipe, an L-shaped pipe or a U-shaped pipe.
Optionally, the low frequency broadband sound absorbing device further comprises a third sound absorbing module comprising a third resonant cavity member connected to the second resonant cavity member along the first direction and having a third resonant cavity therein, the third resonant cavity member being provided with a third sound absorbing hole, and a third cannula provided to the third sound absorbing hole and communicating the third resonant cavity with the outer side of the sound absorbing surface,
the third cannula is connected to and flush with the sound absorbing surface.
Optionally, the first resonant cavity is a prism or a cylinder, and the second resonant cavity is a prism or a cylinder; and/or
The cross-sectional area of the first sound absorbing module and the cross-sectional area of the second sound absorbing module are equal along the first direction.
Optionally, the number of the first sound absorbing units and the number of the second sound absorbing units are equal or different.
According to the utility model discloses a low frequency broadband sound absorbing device, include two at least sound absorption modules that set up along the first direction. The at least two sound absorption modules comprise a first sound absorption module and a second sound absorption module, wherein the first sound absorption module comprises at least one first sound absorption unit, the second sound absorption module comprises at least one second sound absorption unit, the first sound absorption unit comprises a first resonance cavity member, a first resonance cavity is arranged in the first resonance cavity member, the outer side surface of the first resonance cavity member along the first direction is a sound absorption surface, and the sound absorption surface is provided with a first sound absorption hole. The second sound absorption unit comprises a second resonant cavity member, the second resonant cavity member is connected to the first resonant cavity member along the first direction and located on the other side opposite to the sound absorption surface, a second resonant cavity is arranged in the second resonant cavity member, the second resonant cavity is isolated from the first resonant cavity, the second resonant cavity member is provided with a second sound absorption hole, and the second sound absorption hole is communicated with the second resonant cavity and the outer side of the sound absorption surface. The utility model discloses with two at least sound absorption modules along first direction layering to with first resonant cavity and second resonant cavity all with the outside intercommunication on sound absorption surface, widen whole sound absorbing device sound absorption bandwidth.
Drawings
The following drawings of the embodiments of the present invention are provided as a part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions thereof, which are used to explain the principles of the invention. In the drawings, there is shown in the drawings,
fig. 1 is a schematic perspective view of a low frequency broadband sound absorber according to a preferred embodiment of the present invention;
fig. 2 is a schematic perspective view of a low-frequency broadband sound absorber according to a second preferred embodiment of the present invention;
fig. 3 is a schematic perspective view illustrating a low frequency broadband sound absorbing device according to a third preferred embodiment of the present invention;
fig. 4 is a schematic perspective view of a low-frequency broadband sound absorbing device according to a fourth preferred embodiment of the present invention; and
fig. 5 is a perspective view illustrating a sound absorption unit according to a preferred embodiment of the present invention.
Description of reference numerals:
10: the sound absorption unit 11: resonant cavity component
12: inserting the tube 13: sound absorbing surface
14: the pipe section with through holes 15: sound absorption hole
100: the sound absorbing device 110: first sound absorption unit
111: first resonant cavity member 112: a first cannula
113: sound absorbing surface 114: first sound absorption hole
115: connecting hole 120: second sound absorption unit
121: second resonant cavity member 122: second cannula
123: second sound-absorbing hole 200: sound absorption device
210: first sound absorbing unit 211: first resonant cavity member
212: the first cannula 213: sound absorbing surface
214: first sound-absorbing hole 215: first connecting hole
216: second connection hole 220: second sound absorption unit
221: second resonant cavity means 222: second cannula
223: second sound-absorbing hole 230: third sound absorption unit
231: third resonance chamber member 232: third cannula
233: third sound-absorbing hole 300: sound absorption device
310: first sound absorbing unit 311: first resonant cavity member
312: first cannula 313: sound absorbing surface
314: first sound-absorbing hole 315: connecting hole
320: second sound absorbing unit 321: second resonant cavity member
322: the second cannula 323: second sound absorption hole
400: the sound absorbing device 410: first sound absorption unit
411: first resonant cavity member 412: a first cannula
413: sound absorbing surface 414: first sound absorption hole
415: connection hole 420: second sound absorption unit
421: the second resonant cavity member 422: second cannula
423: second sound-absorbing hole D1: a first direction
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring embodiments of the present invention.
In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The present invention is described in detail below with reference to preferred embodiments thereof, however, the present invention can have other embodiments in addition to the detailed description, and should not be construed as being limited to the embodiments set forth herein.
It is to be understood that the terms "a," "an," and "the" as used herein are intended to describe specific embodiments only and are not to be taken as limiting the invention, which is intended to include the plural forms as well, unless the context clearly indicates otherwise. When the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like as used herein are for illustrative purposes only and are not limiting.
Ordinal words such as "first" and "second" are referred to in this application as labels only, and do not have any other meanings, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".
Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the present invention and do not limit the present invention.
According to the utility model discloses a low frequency broadband sound absorbing device, include two at least sound absorption modules that set up along the first direction, two at least sound absorption modules include first sound absorption module and second sound absorption module.
Wherein the first sound absorption module comprises at least one first sound absorption unit. The first sound absorption unit comprises a first resonant cavity member, a first resonant cavity is arranged in the first resonant cavity member, and the outer side surface of the first resonant cavity member along the first direction is a sound absorption surface. The sound absorption surface is provided with a first sound absorption hole;
the second sound absorbing module includes at least one second sound absorbing unit. The second sound absorbing unit includes a second resonant cavity member connected to the first resonant cavity member in the first direction and located on the other side opposite to the sound absorbing surface. The second resonant cavity member has a second resonant cavity therein, the second resonant cavity being isolated from the first resonant cavity. The second resonant cavity member is provided with a second sound-absorbing hole which communicates the second resonant cavity and the outside of the sound-absorbing surface.
In other words, the utility model discloses a follow first direction layering with at least two sound absorption modules and set up to communicate the resonant cavity of each sound absorption unit respectively to the outside of sound absorbing surface through respective sound absorption hole. The sound wave is transmitted into the resonant cavity through the sound absorption hole.
Taking the embodiment shown in fig. 1 as an example, the sound absorbing device 100 includes a first sound absorbing module and a second sound absorbing module disposed in a first direction D1. Wherein the first sound absorption module includes a first sound absorption unit 110, and the second sound absorption module includes a second sound absorption unit 120.
Specifically, the first sound-absorbing unit 110 includes a first resonance chamber member 111 and a first insertion tube 112. Referring to fig. 1, the first resonant cavity member 111 is configured as a quadrangular prism, which is convenient to install, transport, and replace. The first cannula 112 is a straight tube. An outer side surface of the first sound absorbing unit 110 in the first direction D1 is a sound absorbing surface 113 (i.e., a top surface in fig. 1). The sound absorption surface 113 is opened with a first sound absorption hole 114, the first insertion tube 112 is connected to the first sound absorption hole 114, and the first insertion tube 112 at least partially extends into the first resonance cavity to communicate the first resonance cavity and the outside of the first resonance cavity member 111. It is understood that the first cannula 112 is disposed to the first sound-absorbing hole 114 to construct a transmission channel of the sound wave. Varying the size of the first sound-absorbing hole 114 and the length of the first insertion tube 112 may vary the sound-absorbing effect of the first sound-absorbing unit.
Preferably, the first cannula 112 is disposed along a central axis of the first resonant cavity or the first cannula 112 is disposed proximate to a central axis of the first resonant cavity. It is understood that, in order to secure the sound absorption effect, the first cannula 112 is spaced from the rim of the first resonant cavity member 111 by not less than 1/4 of the length of the corresponding rim.
The second sound-absorbing unit 120 is located at a lower layer of the first sound-absorbing unit 110 facing away from the sound-absorbing surface 113 in the first direction D1. Likewise, the second sound absorbing unit 120 includes a second resonant cavity member 121 and a second cannula 122. The second resonant cavity member 121 defines a second sound-absorbing hole 123 along the first direction D1. The second cannula 122 is a straight tube, and the length of the second cannula 122 is greater than the length of the first cannula 112. The second cannula 122 is connected to the second sound-absorbing aperture 123, and one end of the second cannula 122 extends at least partially into and communicates with the second resonant cavity, and the other end of the second cannula 122 passes through the first resonant cavity and is connected to the sound-absorbing surface 113. The outside of the first resonant cavity member 111.
The second resonant cavity member 121 is constructed as a quadrangular prism, which is convenient to install, transport and replace. The cross-sectional area of the second resonant cavity is equal to the cross-sectional area of the first resonant cavity along the first direction D1.
Preferably, the second cannula 122 is disposed along or near a central axis of the second resonant cavity. It will be appreciated that, in order to ensure sound absorption, the second cannula 122 is spaced from the rim of the second cavity member 121 by a distance not less than 1/4 of the length of the corresponding rim.
The second cannula 122 is no less than 1/4 of the length of the corresponding rim from the rim of the second resonant cavity member 121.
As shown in fig. 1, the first cannula 112 is flush with the sound absorbing surface 113. The second cannula 122 is spaced apart from the first cannula 112 and the second cannula 122 is flush with the sound absorbing surface 113. The opening of the first cannula 112 and the opening of the second cannula 122 are both facing in the first direction D1. The second resonant cavity is separated from the first resonant cavity by a partition plate, the partition plate is provided with a second sound absorption hole 123, one end of the second insertion tube 122 is connected to the second sound absorption hole 123, the other end of the second insertion tube 122 penetrates through the first resonant cavity and is connected to the sound absorption surface 113, and the sound absorption surface 113 is provided with a connecting hole 115 for accommodating the second insertion tube 122.
The utility model discloses an among the sound absorbing device, along first direction, the intubate length that every layer of sound absorbing unit corresponds is longer and longer, also is the transmission path of sound wave longer and longer. According to the acoustic principle, from the first sound absorption module above to the lower part, the peak frequency of the sound absorption coefficient of each layer of sound absorption units gradually expands towards low frequency, so that the broadband sound absorption effect is obtained. Through the design of connecting the sound absorption modules in series up and down, the sound absorption modules are connected in parallel acoustically. The adjustment range of the sound absorption frequency is enlarged, and the sound absorption bandwidth of the whole sound absorption device is widened.
The utility model discloses in, first sound absorption unit and second sound absorption unit all are helmholtz resonator type sound absorption unit. The openings of the insertion pipes of all the sound absorption units are on the same surface (sound absorption surface) acoustically, so that the sound absorption devices which are connected in series and in parallel acoustically with the sound absorption units in different layers are formed. The utility model discloses a this kind of sound absorbing device increases the sound absorption module and does not change the cross-sectional area ratio of original every sound absorption unit in whole sound absorbing device, so whole sound absorbing device sound absorption frequency band can be widened to the newly-increased sound absorption module.
In fig. 1, the first cannula 112 is a straight, constant diameter tube, and the second cannula 122 is a straight, constant diameter tube. The straight pipe is convenient for production, manufacture and installation. In other embodiments of the present invention, the first and second insertion tubes may also be L-shaped tubes or U-shaped tubes.
Optionally, both ends of the first cannula (or the second cannula) are open, and the areas of both ends of the first cannula (or the second cannula) may be the same or different. And the cross section of the first cannula (or the second cannula) can adopt a round, square or other shape structure. The pipe diameter of the first intubation (or the second intubation) can be a pipe with equal pipe diameter or a pipe with variable pipe diameter. The person skilled in the art can design the cannula flexibly according to the actual situation.
In fig. 1, the first resonant cavity and the second resonant cavity are cubes of equal size. In other embodiments of the present invention, the first resonant cavity and the second resonant cavity may be prism or cylinder. And the size of the first resonant cavity and the size of the second resonant cavity may also be set to be different.
In the embodiment shown in fig. 2, the sound absorption apparatus 200 includes three sound absorption modules, a first sound absorption module including a first sound absorption unit 210, a second sound absorption module including a second sound absorption unit 220, and a third sound absorption module including a third sound absorption unit 230.
The first sound-absorbing unit 210 includes a first resonance chamber member 211 and a first insertion tube 212. An outer side surface of the first sound absorbing unit 210 in the first direction D1 is a sound absorbing surface 213. The second sound absorbing unit 220 and the third sound absorbing unit 230 are sequentially disposed in a direction away from the sound absorbing surface 213. The second sound absorbing unit 220 comprises a second resonant cavity member 221 and a second cannula 222.
The third sound absorbing unit 230 includes a third resonant cavity member 231 and a third cannula 232. The third resonant cavity 231 is a quadrangular prism, and the third resonant cavity 231 is opened with a third sound-absorbing hole 233. Along the first direction D1, the cross-sectional area of the third resonant cavity, the cross-sectional area of the second resonant cavity, and the cross-sectional area of the first resonant cavity are equal.
The first cannula 212, the second cannula 222 and the third cannula 232 are spaced apart. The sound absorbing surface 213 defines a first sound absorbing aperture 214, and the first sound absorbing aperture 214 is configured to receive the first cannula 212.
The second resonant cavity member 221 is formed with a second sound-absorbing hole 223, the second tube 222 is a straight tube, the second tube 222 is disposed to the second sound-absorbing hole 223, and one end of the second tube at least partially extends into the second resonant cavity. The other end of the second insertion tube 222 passes through the first resonant cavity and is connected to the sound absorption surface 213, and the sound absorption surface 213 is provided with a first connection hole 215 for accommodating the second insertion tube 222.
The third cannula 232 is disposed to the third sound-absorbing hole 233 and communicates with the third resonance chamber. Referring to fig. 2, the third cannula 232 is a straight tube, and the length of the third cannula 232 is greater than the length of the second cannula 222. One end of the third insertion tube 232 at least partially protrudes into the third resonance chamber, and the other end of the third insertion tube 232 passes through the second resonance chamber and the first resonance chamber in sequence and then is connected to the second connection hole 216. The third cannula 232 is flush with the sound absorbing surface 213.
Preferably, the third cannula 232 is disposed along a central axis of the third resonant cavity or the third cannula 232 is disposed proximate to the central axis of the third resonant cavity. It is understood that, in order to secure the sound absorption effect, the distance of the third cannula 232 from the rim of the third resonant cavity member 231 is not less than 1/4 of the length of the corresponding rim.
In the embodiment shown in fig. 1, the sound absorption device 100 is provided with two sound absorption modules, and in the embodiment shown in fig. 2, the sound absorption device 200 is provided with three sound absorption modules, and a person skilled in the art can also arrange a plurality of sound absorption modules along the first direction D1 according to actual conditions, so as to widen the sound absorption bandwidth of the sound absorption device.
Optionally, the first sound absorption module comprises a plurality of first sound absorption units arranged side by side. The adjacent first sound absorption units are connected with each other. The number of the second sound absorption units is the same as the number of the first sound absorption units. Each of the sound absorption modules in the embodiments shown in fig. 1 and 2 includes one sound absorption unit, and those skilled in the art may arrange two or more sound absorption units in each sound absorption module to widen a sound absorption frequency band of the sound absorption apparatus.
In the embodiment shown in fig. 3, the sound absorbing apparatus 300 includes two sound absorbing modules, a first sound absorbing module having a plurality of first sound absorbing units 310 and a second sound absorbing module having a plurality of second sound absorbing units 320. The number of the first sound absorbing units 310 is the same as that of the second sound absorbing units 320, and the sizes of the first resonant cavity and the second resonant cavity are also the same. The cross-sectional area of the second sound absorption module is equal to the cross-sectional area of the first sound absorption module in the first direction D1.
Referring to fig. 3, the first sound absorbing module includes four first sound absorbing units 310 arranged in an array, and each of the first sound absorbing units 310 includes a first resonant cavity member 311 and a first insertion tube 312. The sound-absorbing surfaces of the respective four first sound-absorbing units 310 are connected to constitute the sound-absorbing surface 313 of the entire sound-absorbing device 300. The sound absorbing surface 313 is provided with four first sound absorbing holes 314, and four first inserting tubes 312 are respectively provided to the four first sound absorbing holes 314.
The second sound absorption module is located below the first sound absorption module, and the second sound absorption module comprises four second sound absorption units 320 distributed in an array. Each second sound absorbing unit 320 includes a second resonant cavity member 321 and a second insertion tube 322, and each second resonant cavity member 321 is opened with a second sound absorbing hole 323. In fig. 4, four second insertion tubes 322 are provided to the four second sound-absorbing holes 323, respectively. Four attachment holes 315 are also provided in the sound absorbing surface 313, the attachment holes 315 being adapted to receive the second insertion tube 322.
Optionally, the first sound absorption module comprises a plurality of first sound absorption units arranged side by side. The adjacent first sound absorption units are connected with each other. The number of the second sound absorbing units is different from the number of the first sound absorbing units.
In the embodiment shown in fig. 4, the sound absorption apparatus 400 includes two sound absorption modules, a first sound absorption module having a plurality of first sound absorption units 410 and a second sound absorption module having one second sound absorption unit 420. The number of the first sound absorbing units 410 and the number of the second sound absorbing units 420 are different. The first resonant cavity and the second resonant cavity are different in size.
The cross-sectional area of the second sound absorption module is equal to the cross-sectional area of the first sound absorption module along the first direction D1.
Referring to fig. 4, the first sound-absorbing module includes four first sound-absorbing units 410 distributed in an array, and each of the first sound-absorbing units 410 includes a first resonant cavity member 411 and a first insertion tube 412. The sound absorbing surfaces of the respective four first sound absorbing units 410 are connected to constitute the sound absorbing surface 413 of the whole sound absorbing device 400. Four first sound absorbing holes 414 are provided in the sound absorbing surface 413, four first insertion tubes 412 are provided to the four first sound absorbing holes 414, respectively, and the first insertion tubes 412 are provided along the central axis of the first resonance chamber.
The second sound absorption module is located below the first sound absorption module, the second sound absorption module includes a second sound absorption unit 420, and the second sound absorption unit 420 includes a second resonance chamber member 421 and a second insertion tube 422. The second resonance chamber member 421 is opened with a second sound absorbing hole 423. In fig. 4, the second cannula 422 is a straight tube, the second cannula 422 is disposed to the second sound-absorbing hole 423, and the second cannula 422 is disposed along the central axis of the second resonant cavity. Sound absorbing surface 413 is also provided with a connection hole 415, which connection hole 415 is adapted to receive a second cannula 422.
In the embodiment shown in fig. 3 and 4, only two sound absorption modules are taken as an example for illustration, and a person skilled in the art can flexibly set the number of the sound absorption modules and the number of the sound absorption units included in each sound absorption module according to actual conditions.
Referring to fig. 5, a sound absorption unit 10 used in a sound absorption device according to the present invention includes a resonance chamber member 11 and an insertion tube 12. Wherein the resonant cavity member 11 is rectangular parallelepiped, and the sound absorption surface 13 of the resonant cavity member 11 is provided with sound absorption holes 15. The insertion tube 12 is a straight tube, one end of the insertion tube 12 is connected to the sound-absorbing hole 15, and the other end of the insertion tube 12 extends into the resonant cavity and is connected to the inner wall of the resonant cavity member 11. The cannula 12 extending into the resonant cavity includes a perforated tubular section 14. The sound waves enter the resonant cavity through the perforated tube section 14 on the cannula 12. The mode can improve the sound energy loss of the sound absorption unit and is beneficial to enabling the sound absorption coefficient curve to be more smooth.
The specific structure of the low-frequency broadband sound absorption device can be designed by those skilled in the art according to the frequency and the size of the sound absorption coefficient and the requirement of the installation space provided on site.
For example, when the sound absorption frequency range is not required to be particularly wide, two or three sound absorption modules may be provided. If the thickness of the field installation space is small, parameters such as the thickness, the cross-sectional area, the diameter of the insertion pipe, the length of the insertion pipe and the like of the sound absorption unit in each sound absorption module can be flexibly adjusted to meet the sound absorption coefficient index.
When the sound absorption frequency range is required to be wide, a plurality of sound absorption units can be arranged in each sound absorption module in parallel, and then a plurality of sound absorption modules are designed in series. Therefore, the number of the sound absorption units is increased through series connection, the sound absorption frequency width is widened, the proportion of the cross section area of each sound absorption unit in the total cross section area of the whole sound absorption device is not reduced, and the aims of increasing the sound absorption bandwidth and keeping the sound absorption coefficient at a high level are well fulfilled.
Through many physics simulation software COMSOL Multiphysics 6.0 acoustics finite element module right according to the utility model discloses a sound absorbing device's sound absorption coefficient carries out discovery after the emulation calculation, utilizes the simulation software to calculate the sound absorbing device's sound absorption coefficient curve and utilizes analytic method to calculate the sound absorbing device's sound absorption coefficient curve good. Simulation software is utilized to carry out simulation calculation on three sound absorption devices containing different numbers of sound absorption modules, and the results are found: along with the increase of the serial number of the sound absorption modules, the frequency bandwidth of the sound absorption coefficient of the sound absorption device is gradually expanded to low frequency, and meanwhile, the size of the sound absorption coefficient of the sound absorption device is basically kept unchanged.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, appearing herein, may mean either that one element is directly attached to another element, or that one element is attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.
The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. It will be appreciated by those skilled in the art that many more modifications and variations are possible in light of the above teaching and are intended to be included within the scope of the invention.
Claims (10)
1. A low frequency broadband sound absorbing device, wherein the low frequency broadband sound absorbing device comprises:
the sound absorption module comprises at least two sound absorption modules arranged along a first direction, wherein the at least two sound absorption modules comprise a first sound absorption module and a second sound absorption module;
the first sound absorption module comprises at least one first sound absorption unit, the first sound absorption unit comprises a first resonant cavity member, a first resonant cavity is arranged in the first resonant cavity member, the outer side surface of the first resonant cavity member along the first direction is a sound absorption surface, and the sound absorption surface is provided with a first sound absorption hole;
the second sound absorption module comprises at least one second sound absorption unit comprising a second resonance chamber member connected to the first resonance chamber member in the first direction and located on the other side opposite to the sound absorption surface, the second resonance chamber member having a second resonance chamber therein, the second resonance chamber being isolated from the first resonance chamber, the second resonance chamber member being provided with a second sound absorption hole communicating the second resonance chamber and the outside of the sound absorption surface.
2. The low frequency broadband sound absorbing device according to claim 1, wherein the first sound absorbing module comprises two or more of the first sound absorbing units arranged in parallel.
3. The low frequency broadband sound absorbing device of claim 1, wherein the second sound absorbing module comprises two or more of the second sound absorbing units arranged in parallel.
4. The low frequency broadband sound absorbing device according to any one of claims 1 to 3, wherein the first sound absorbing unit comprises a first insertion pipe provided to the first sound absorbing hole and flush with the sound absorbing surface;
the first cannula extends at least partially into the first resonant cavity and communicates the first resonant cavity with the exterior side of the sound absorbing surface.
5. The low frequency broadband sound absorbing device of claim 4,
a through hole communicated with the first resonance cavity is formed in the surface of the first cannula extending into the first resonance cavity; and/or
The first inserting pipe is a straight pipe, an L-shaped pipe or a U-shaped pipe.
6. The low frequency broadband sound absorbing device according to claim 4, wherein the second sound absorbing unit includes a second insertion tube provided to the second sound absorbing hole and extending at least partially into the second resonance chamber and communicating the second resonance chamber with the outside of the sound absorbing surface,
the second cannula is connected to and flush with the sound absorbing surface.
7. The low frequency broadband sound absorbing device according to claim 6, wherein a surface of the second cannula extending into the second resonant cavity is provided with a through hole communicating with the second resonant cavity; and/or
The second inserting pipe is a straight pipe, an L-shaped pipe or a U-shaped pipe.
8. The low frequency broadband sound absorbing device according to claim 4, further comprising a third sound absorbing module comprising a third resonant cavity member connected to the second resonant cavity member in the first direction and having a third resonant cavity therein, the third resonant cavity member being provided with a third sound absorbing hole, and a third cannula provided to the third sound absorbing hole and communicating the third resonant cavity and the outside of the sound absorbing surface,
the third cannula is connected to and flush with the sound absorbing surface.
9. The low frequency broadband sound absorbing device according to claim 1, wherein the first resonant cavity is a prism or a cylinder and the second resonant cavity is a prism or a cylinder; and/or
A cross-sectional area of the first sound absorbing module and a cross-sectional area of the second sound absorbing module are equal along the first direction.
10. The low frequency broadband sound absorbing device according to claim 9, wherein the number of the first sound absorbing units and the number of the second sound absorbing units are equal or different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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