CN220355675U - Silencing air duct and system with same - Google Patents
Silencing air duct and system with same Download PDFInfo
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- CN220355675U CN220355675U CN202320865509.7U CN202320865509U CN220355675U CN 220355675 U CN220355675 U CN 220355675U CN 202320865509 U CN202320865509 U CN 202320865509U CN 220355675 U CN220355675 U CN 220355675U
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
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Abstract
The application provides a noise elimination wind channel and have system in noise elimination wind channel. The silencing air duct comprises a first end and a second end which are opposite to each other, and an air cavity penetrating through the first end and the second end; the sound-absorbing air duct is provided with a plurality of resonant cavities, at least one communication part is arranged on one side of the sound-absorbing air duct facing the air cavity, and each resonant cavity is communicated with the air cavity through the at least one communication part so as to absorb the energy of sound waves in the air cavity through resonance; the silencing air duct is provided with a plurality of silencing modules in the extending direction of the air cavity, and at least one resonant cavity is arranged in at least one silencing module. The silencing air duct has the effects of broadband sound wave absorption effect, space occupation reduction, expansion ratio reduction, modularization of the silencing air duct and preparation difficulty reduction.
Description
Technical Field
The utility model relates to the technical field of pipeline noise elimination, in particular to a noise elimination air duct and a system with the noise elimination air duct.
Background
With the improvement of life quality demands, central air conditioners gradually enter more and more home users. However, the air disturbance phenomenon in the air duct of the domestic central air conditioner is obvious, aerodynamic noise is easily generated, and the air duct noise radiates from the tail end, so that the life quality of each family is seriously affected.
Disclosure of Invention
Based on this, the present utility model aims to provide an improved muffling air duct to reduce duct noise.
In a first aspect, the present application provides a sound-damping duct comprising opposite first and second ends, and a wind chamber passing through the first and second ends;
the sound-absorbing air duct is characterized in that a plurality of resonant cavities are arranged in the sound-absorbing air duct, at least one communication part is arranged on one side, facing the air cavity, of the sound-absorbing air duct, and each resonant cavity is communicated with the air cavity through the at least one communication part so as to absorb the energy of sound waves in the air cavity through resonance;
the wind cavity is characterized in that the silencing wind channel is provided with a plurality of silencing modules in the extending direction of the wind cavity, and at least one resonant cavity is arranged in at least one silencing module.
Above-mentioned noise elimination wind channel possesses following beneficial effect at least:
1. the resonant cavity is arranged in the silencing air duct, when the frequency of sound waves in the air cavity is basically consistent with the natural frequency of the resonant cavity, the air in the resonant cavity can be subjected to severe vibration so as to generate heat by friction with the side wall of the resonant cavity, the conversion from sound energy to mechanical energy and then to internal energy are realized, and finally the energy absorption of the sound waves in the air cavity is realized;
2. the plurality of resonant cavities are arranged, and a plurality of coupling resonant frequencies can be generated by utilizing the near-field coupling effect among the resonant cavities, so that the range of sound absorption frequency of sound waves is widened, and the silencing performance of a silencing air duct is improved;
3. the plurality of silencing modules are arranged in the extending direction of the wind cavity, so that each silencing part extends inwards, the transverse space occupation of the silencing wind channel can be effectively reduced, the expansion ratio of the silencing wind channel is reduced, and the silencing wind channel is modularized without integrally preparing a wind channel with a larger length, thereby being beneficial to reducing the preparation difficulty of the silencing wind channel and further reducing the preparation cost;
4. it is worth mentioning that, because the above-mentioned noise elimination wind channel itself has the noise elimination effect to under the same noise elimination demand, can effectively reduce the use of extra porous sound absorbing material, thereby be favorable to further reducing space occupation, reduce expansion ratio, and further reduce manufacturing cost.
In one embodiment, each of the silencing modules has an air inlet end, an air outlet end and a cavity penetrating through the air inlet end and the air outlet end, and the cavities are sequentially communicated to form the air cavity; wherein, every the silence module is provided with at least one intercommunication portion towards one side of its cavity, and every the silence module's inside has at least one the resonant cavity, every the resonant cavity passes through at least one the intercommunication portion with the wind chamber intercommunication.
In one embodiment, at least one of the muffler modules includes a plurality of super-structured muffler substrates disposed along a circumferential direction thereof; at least one communication part is arranged on one side, facing the wind cavity, of at least one super-structure silencing substrate, at least one resonant cavity is arranged in the super-structure silencing substrate, and each resonant cavity is communicated with the wind cavity through at least one communication part.
In one embodiment, at least one of the super-structure muffling substrates comprises a plurality of helmholtz resonators including: the housing is provided with a first side and a second side which are oppositely arranged, the first side faces the wind cavity and is provided with at least one through hole; and at least one cannula, each cannula is connected with each through hole in a one-to-one correspondence manner and extends towards the second side; at least one of the silencing modules comprises: the value range of the perforation rate of the through hole comprises 5% -40%; and/or the value range of the diameter of the through hole comprises 0.5 mm-20 mm; and/or the value range of the length of the cannula comprises 2 mm-20 mm.
In one embodiment, the silencing air duct further comprises at least one silencing plugboard arranged in the air cavity; at least one communication part is respectively arranged on two sides of at least one silencing inserting plate, at least two resonant cavities are arranged in the at least one silencing inserting plate, and each resonant cavity is communicated with the wind cavity through at least one communication part.
In one embodiment, the at least one sound attenuation plugboard comprises a plurality of super-structure sound attenuation base plates which are arranged back to back, at least one communication part is arranged on one side of each super-structure sound attenuation base plate, which is exposed to the wind cavity, at least one resonant cavity is arranged inside each super-structure sound attenuation base plate, and each resonant cavity is communicated with the wind cavity through at least one communication part.
In one embodiment, at least one of the sound damping insert plates is provided with a flow guiding portion, which is directed towards the first end and/or the second end; and/or the number of at least one of the sound attenuation plugboards is smaller than or equal to a preset value.
In one embodiment, the wind turbine further comprises a porous sound absorbing material arranged at the side of the wind cavity.
In a second aspect, the present application provides a sound-damping duct comprising opposite first and second ends, and a wind chamber passing through the first and second ends; the wind cavity is characterized in that the silencing wind channel is provided with a plurality of silencing modules in the extending direction of the wind cavity, at least one resonant cavity is arranged in each silencing module, and each resonant cavity absorbs the energy of sound waves in the wind cavity through resonance.
The silencing air duct has the effects of reducing space occupation, reducing expansion ratio and reducing preparation difficulty by modularization based on the local resonance effect of each resonant cavity, can contain more types of resonant cavities, and is favorable for further meeting the customized design requirement of the silencing air duct.
In a third aspect, the present application provides a system with a muffling air duct, where the muffling air duct is a muffling air duct as described above, and the system further includes a power generating device, where the muffling air duct is disposed at an air inlet and/or an air outlet of the power generating device.
The system uses the silencing air duct as a communicating pipe for connecting the air inlet and/or the air outlet of the power generation device, so that noise generated by gas disturbance in the system can be effectively reduced.
In one embodiment, the power generation device may include a compressor, oil press, engine, fan, etc.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present description, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic view of a muffler duct according to an embodiment of the present disclosure;
FIG. 2 is a schematic top view of a sound attenuation duct according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a muffler module according to an embodiment of the present disclosure;
FIG. 4 is a schematic front view of the muffler module of FIG. 3;
FIG. 5 is a schematic cross-sectional view of the face A-A of the muffler module shown in FIG. 4;
FIG. 6 shows a transmission loss curve of the muffler module of FIG. 3;
FIG. 7 is a schematic front view of an ultra-structured sound damping substrate according to an embodiment of the present disclosure;
FIG. 8 is a schematic cross-sectional view of the B-B side of the super-structure muffling substrate of FIG. 7;
FIG. 9 shows the sound absorption coefficient versus frequency for the super-structure muffling substrate of FIG. 7;
FIG. 10 is a schematic view of a structure of a sound damping insert plate according to an embodiment of the present disclosure;
FIG. 11 is a schematic top view of a sound attenuation duct according to another embodiment of the present application;
FIG. 12 is a schematic top view of a sound attenuation duct according to yet another embodiment of the present application;
FIG. 13 is a schematic cross-sectional view of the face C-C of the muffling air duct of FIG. 12;
FIG. 14 shows a transfer loss curve for the muffling air duct of FIG. 12;
fig. 15 is a schematic structural diagram of a system according to an embodiment of the present application.
Description of element numbers:
1. a system;
10. the device comprises a silencing air duct, 11, a first end, 12, a second end, 13, an air cavity, 14 and a communication part;
40. a power generation device 41 and a second diversion part;
110. the device comprises a silencing module, 111, an air inlet end, 112, an air outlet end, 113, a cavity, 114, a communication part, 115 and a resonant cavity;
120. a sound attenuation insert plate 121, a first side of the insert plate 122, a second side of the insert plate 123, and a first flow guiding part;
1110. the super-structure sound-absorbing substrate, 1111, a housing, 1111A, a first side of the housing, 1111B, a second side of the housing, 1112, a through hole, 1113, a cannula, 1114, and a Helmholtz resonator;
20. the sound-absorbing air duct, 23, an air cavity, 220, a sound-absorbing plugboard, 230, a porous sound-absorbing material, 2110 and a super-structure sound-absorbing substrate;
30. the sound-absorbing base plate comprises a sound-absorbing air duct, 33, an air cavity, 320, a sound-absorbing insert plate, 330, a porous sound-absorbing material, 3110 and an ultra-structure sound-absorbing base plate.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The distance that sound propagates in the pipeline is longer, and the wavelength of medium-low frequency noise is longer, and diffraction ability is strong, and energy dissipation is slow, hardly fades away. Noise radiates from the tail end of the pipeline, and the noise harm is very large caused to the ventilating pipeline of the central air conditioner, the automobile exhaust pipe, the aeroengine, the hydraulic system and the like, and meanwhile, the living environment of people is also influenced.
Based on the above-mentioned problem, this application provides a noise elimination wind channel, compares in traditional equipment wind channel, can widen the noise elimination frequency in wind channel under the circumstances of less expansion ratio, lower cost to reduce the space occupation in wind channel, reduce the influence of wind channel noise to equipment and people's life quality. Therefore, the silencing air duct has higher industrial value and wide application prospect.
Specifically, the muffling air duct of the present application designs an acoustic super-structure material constituting the muffling air duct based on a local resonance effect to absorb energy of sound waves in the air duct through local resonance. The acoustic super-structure material takes an artificial resonance structure as a functional element, and realizes the artificial regulation and control of equivalent acoustic parameters by carrying out spatial sequence on the functional element, thereby realizing the performance regulation and control of the small-size sub-wavelength element on the propagation, refraction, reflection and absorption of the large long-wave sound wave. Compared with the traditional acoustic material, the acoustic super-structure material can break through the physical size limitation of the traditional material, and utilizes the sub-wavelength local resonance principle to convert the energy of sound waves into heat energy through the resonance action of the artificial resonance structure. From the electrodynamic physics principle, on the premise of meeting causality, the microstructure of the acoustic super-structure material has an optimal solution, so that the acoustic super-structure material can realize high-efficiency sound absorption within a wider frequency band range in a smaller volume (thickness).
In one embodiment of the present application, as shown in fig. 1 and 2, the muffling air duct 10 includes opposite first and second ends 11 and 12, and an air chamber 13 penetrating the first and second ends 11 and 12; the inside of the muffling air duct 10 has a plurality of resonance chambers (not shown in fig. 1 and 2), and the muffling air duct 10 is provided with at least one communication portion 14 on a side facing the wind chamber 13, each of the resonance chambers communicating with the wind chamber 13 through the at least one communication portion 14 to absorb energy of sound waves in the wind chamber through resonance. The silencing air duct 10 is provided with a plurality of silencing modules 110 in the extending direction of the air cavity 13, and at least one resonant cavity is arranged in at least one silencing module 110.
In some implementations of the present embodiment, the resonant cavity may be a Fabry-Perot resonant cavity, a helmholtz resonant cavity, a back cavity of a microperforated panel, etc., and may be specifically adapted according to the desired sound absorption performance requirements. When the resonant cavity is a Fabry-Perot resonant cavity or a Helmholtz resonant cavity, broadband sound absorption can be realized by impedance matching regulation and control of a plurality of resonant cavities with different structures on the basis of accurately describing the loss of sound waves in different resonant cavities. When the resonant cavity is the back cavity of the microperforated panel, the impedance matching modulation can be realized by utilizing the series coupling between the multistage microperforated panel and the back cavity based on the microperforated sound absorption principle, so that the broadband sound absorption is realized.
In some implementations of the present embodiment, the communicating portion 14 may be one or more of a through hole (or referred to as a micropore), a groove, a notch, and a cannula, which may specifically be selected according to an actual application scenario and a noise reduction requirement, which is not limited in this application.
In some implementations of the present embodiment, the configuration relationship between the muffler module 110 and the resonant cavity in the muffler air duct 10 may be one or more of the following configuration relationships: one muffler module 110 has a plurality of resonators, and the other muffler module 110 has at least one resonator; one muffler module 110 has multiple resonant cavities, while other muffler modules 110 have no resonant cavities (muffling by other muffler structures); at least two of the muffler modules 110 each have at least one resonant cavity. The specific configuration relation can be selected according to the actual application scene and the noise elimination requirement, and the application is not limited to this.
In some implementations of the present embodiment, as shown in fig. 3 to 5, each muffler module has an air inlet end 111 and an air outlet end 112 opposite to each other, and a cavity 113 penetrating the air inlet end 111 and the air outlet end 112, and the cavities 113 are sequentially communicated to form an air chamber 13; wherein, each muffler module 110 is provided with at least one communication part 114 toward one side of the cavity 113 thereof, and each muffler module 110 has at least one resonant cavity 115 inside, and each resonant cavity 115 communicates with the wind chamber 13 through at least one communication part 114. Where arrow D represents the direction of propagation of the sound wave (or wind). Alternatively, the cavity 115 may be one or more of the Fabry-Perot cavity, the Helmholtz cavity, the back cavity of the microperforated panel, as previously described. Through the arrangement, each silencing module 110 is provided with the resonant cavity 115, so that the silencing frequency range of the silencing air duct can be further widened, and the silencing effect of the silencing air duct 10 can be improved.
Fig. 6 shows a transmission loss curve of the muffler module 110 of the present embodiment, in which the transmission loss represents the difference between the incident sound power level at the air intake end 111 and the transmitted sound power level at the air outlet end 112, and the larger the transmission loss, the better the muffling effect of the muffler module 110. As can be seen from FIG. 6, when the incident sound frequency is in the range of 400 Hz-1750 Hz, the muffler module 110 has a transmission loss of more than 10dB, and the muffler module 110 has a better muffler effect.
In summary, the sound-damping air duct 10 of the present embodiment is internally provided with a resonant cavity (such as resonant cavity 115), when the frequency of sound waves in the air cavity 13 is substantially consistent with the natural frequency of the resonant cavity, the air in the resonant cavity can be severely vibrated to generate heat by friction with the side wall of the resonant cavity, so as to convert sound energy into mechanical energy and then into internal energy, and finally realize energy absorption of sound waves in the air cavity 13; in addition, the number of the resonant cavities is multiple, and a plurality of coupling resonant frequencies can be generated by utilizing the near-field coupling effect among the resonant cavities, so that the sound absorption frequency range of sound waves is widened, and the sound elimination performance of the sound elimination air duct 10 is improved; in addition, by arranging the plurality of silencing modules 110 in the extending direction of the air cavity 13, each silencing part extends inwards, so that the occupation of the transverse space of the silencing air duct 10 can be effectively reduced, the expansion ratio of the silencing air duct 10 is reduced, the expansion ratio can be exemplarily made to approach to 1, and the silencing air duct 10 can be modularized without integrally preparing an air duct with a larger length, thereby being beneficial to reducing the preparation difficulty of the silencing air duct 10 and further reducing the preparation cost; finally, it should be noted that, since the noise elimination air duct 10 itself has the noise elimination function, the use of additional porous sound absorption materials can be effectively reduced under the same noise elimination requirement, thereby being beneficial to further reducing the space occupation, reducing the expansion ratio and further reducing the preparation cost.
In this embodiment, the muffler modules 110 and other structures of the muffler duct 10 may be detachably connected, for example, may be fastened, screwed, etc., so that the muffler modules 110 are conveniently increased or decreased at any time, which is beneficial to coping with complex scenes (or scene changes), and in an exemplary embodiment, the amount of sound attenuation can be increased by 3dB to 5dB every time one muffler module 110 is added; and meanwhile, the subsequent maintenance is convenient (only the failed silencing module 110 can be detached and convenient to repair and replace), so that the preparation cost and the maintenance cost of the silencing air duct 10 are reduced.
For example, in this embodiment, the muffler modules 110 and the muffler modules 110 and other structures of the muffler duct 10 may be fixedly connected, for example, welded, riveted, etc., so as to facilitate the improvement of the mechanical strength of the muffler duct 10.
Illustratively, the material of at least part of the noise-reducing air duct 10 in this embodiment includes a metal material and a non-metal material, and may include one or more of steel, iron, aluminum alloy, organic glass, polylactic acid material, plastic, rubber, wood, stone, and carbon fiber composite material. The preparation of the noise elimination air duct 10 by adopting the materials is beneficial to improving the mechanical strength of the noise elimination air duct 10 and is also beneficial to selecting and matching based on the requirements of environmental protection, processing, fire prevention, heat dissipation and the like.
Illustratively, the processing technology of the noise elimination air duct 10 in the present embodiment includes, but is not limited to, 3D printing, plastic integral molding, stamping technology, and the like.
In other implementations of the present embodiment, as shown in fig. 3 to 5, at least one muffler module 110 includes a plurality of super-structured muffler substrates 1110 disposed along a circumferential direction thereof; at least one communication part 114 is arranged on one side of the at least one super-structure silencing substrate 1110 facing the wind cavity 13, and at least one resonant cavity 115 is arranged in the at least one super-structure silencing substrate 1110, and each resonant cavity 115 is communicated with the wind cavity 13 through at least one communication part 114. Optionally, the super structure silencing substrate 1110 and the super structure silencing substrate 1110, and the super structure silencing substrate 1110 and other structures of the silencing module 110 may be fixedly connected or detachably connected, and when the super structure silencing substrate 1110 is detachably connected, only the failed super structure silencing substrate 1110 may be detached for convenient maintenance and replacement, thereby being beneficial to further conveniently reducing the maintenance cost of the silencing air duct 10. Optionally, the disposition of the super-structure muffling base plate 1110 along the circumferential direction of the muffling module 110 includes at least that the super-structure muffling base plate 1110 is disposed at least one of the front side, the rear side, the left side, the right side, the upper side, and the lower side of the muffling module 110. At least part of the silencing module 110 is formed by adopting the super-structure silencing base plate 1110, namely, the silencing module 110 is further modularized, flexible regulation and control of silencing frequency are facilitated, and the customized design requirement of the silencing air duct 10 is conveniently met.
In other implementations of the present example, as shown in fig. 7 and 8, at least one super-structure muffling base 1110 includes a plurality of helmholtz resonators including: a casing 1111 having a first side 1111A and a second side 1111B disposed opposite to each other, the first side 1111A facing the wind chamber 13 and having at least one through hole 1112; and at least one insertion tube 1113, each insertion tube 1113 being connected to each through-hole 1112 in a one-to-one correspondence and extending toward the second side 1111B. Alternatively, a single Helmholtz resonator may also be provided with a plurality of through holes 1112, which facilitates the sound absorption frequency range control of the super-structure muffling base 1110.
In this embodiment, the super-structure muffling base 1110 builds an acoustic metamaterial model using an array of Helmholtz resonators, where the acoustic impedance of the individual Helmholtz resonators can be expressed as follows:
wherein A represents the area of the entire first side 1111A, S a Represents the opening area of the through hole 1112, l a Representing the length of cannula 1113, V represents the volume of cavity 1114, ρ cc 、c cc K cc Respectively representing the density, sound velocity and wave number, k, of air in the resonator 1114 ca 、Ψ va Psi (t) ha Respectively representing the wavenumber, viscosity and thermal terms of the cannula 1113 under narrow acoustic conditions, gamma representing the specific heat capacity of air, delta i Representing the acoustic mass end correction coefficient, τ Ω Represents a correction factor, ω represents an angular frequency, η represents a viscosity coefficient of air, ρ 0 Represents the density of air under natural conditions, c 0 Representing the propagation velocity of sound in the ambient air.
The acoustic impedance includes a real part and an imaginary part, wherein the real part is acoustic impedance, acts on the amplitude of the reflected sound wave, and the imaginary part is acoustic impedance, and represents the phase of the delayed reflected sound wave.
Thus, the overall acoustic impedance Z of the super-structure muffling substrate 1110 satisfies:
wherein n is the number of helmholtz resonance chambers. And further obtaining the sound absorption coefficient of the integral structure:
wherein Z is r And Z i The real and imaginary parts of Z, respectively.
It will be appreciated that the greater the acoustic absorption coefficient, the more the acoustic impedance of the super-structure muffling base plate 1110 is matched with that of air, that is, when the frequency of the incident sound wave is near the natural frequency of the super-structure muffling base plate 1110, the acoustic impedance of the super-structure muffling base plate 1110 is matched with that of air to the highest degree, and the acoustic absorption coefficient may be the greatest, so that the super-structure muffling base plate 1110 may achieve effective sound absorption by local resonance.
Optionally, in the at least one muffler module 110: the perforation rate of the through holes 1112 is 5% -40%; and/or the diameter of the through hole 1112 is in the range of 0.5mm to 20mm; and/or the length of cannula 1113 may range from 2mm to 20mm. Fig. 9 shows the sound absorption coefficient versus frequency for the super-structure muffling base 1110. As can be seen from fig. 9, in the above range, when the incident sound frequency is in the range of 400Hz to 1750Hz, the sound absorption coefficient of the super-structure noise attenuation substrate 1110 is all above 0.6, and it is seen that the super-structure noise attenuation substrate 1110 has a better sound absorption coefficient. In addition to the sound absorbing effect of the super-structure sound absorbing substrate 1110 shown in fig. 9, the sound absorbing module 110 provided with the super-structure sound absorbing substrate 1110 can obtain the sound absorbing effect shown in fig. 6 by reasonable adjustment.
In other implementations of the present embodiment, as shown in fig. 1 and 10, the muffling air duct 10 further includes at least one muffling insert 120 provided in the air chamber 13; wherein, at least one communication portion 124 is provided at both sides 121 and 122 of at least one silencing insert plate 120, respectively, and at least two resonance cavities (not shown in fig. 1 and 10) are provided inside at least one silencing insert plate 120, and each resonance cavity is communicated with the wind cavity 13 through at least one communication portion 124. By arranging the silencing insert plates 120 with sound absorption structures on two sides in the wind cavity 13, the silencing effect of the silencing wind channel 10 can be effectively improved, and the expansion ratio of the silencing wind channel 10 can be further reduced.
Optionally, the at least one sound attenuation insert 120 includes a plurality of super-structure sound attenuation substrates (for example, the super-structure sound attenuation substrates 1110 may be provided as described above) disposed back-to-back, where at least one communication portion 124 is provided on a side of each super-structure sound attenuation substrate exposed to the wind cavity 13, and at least one resonant cavity (for example, the resonant cavity 1114 of the super-structure sound attenuation substrate 1110 may be provided in an interior of each super-structure sound attenuation substrate) and each resonant cavity communicates with the wind cavity 13 through at least one communication portion 124. The above arrangement is beneficial to flexible application of the super-structure silencing substrate, so that the silencing air duct 10 can be prepared by uniformly adopting the super-structure silencing substrate, and the preparation difficulty and cost are reduced.
Optionally, as shown in fig. 10, at least one of the sound damping insert plates 120 is provided with a first flow guiding portion 123, the first flow guiding portion 123 being directed towards the first end 11 and/or the second end 12. Alternatively, the first guiding part 123 may be a guiding cone or guiding column structure. By providing the first flow guiding portion 123, the resistance of the silencing insert plate 120 to wind is reduced and the ventilation of air in the wind cavity 13 is ensured under the condition that the silencing effect is ensured.
Optionally, the number of at least one sound damping insert 120 is less than or equal to a predetermined value. If the number of the silencing insert plates 120 is excessive, resistance of the silencing insert plates 120 to wind is increased, thereby being disadvantageous to air circulation in the wind chamber 13. Alternatively, the predetermined value may be determined based on actual muffling requirements and ventilation performance requirements. For example, when the sound damping requirement is high, the predetermined value may be appropriately larger; when the ventilation performance requirement is higher, the predetermined value may be suitably smaller. Alternatively, the predetermined value may be one of 1, 2, 3, 4.
In another embodiment of the present application, as shown in fig. 11, the noise-reducing air duct 20 may be formed by combining a plurality of super-structure noise-reducing substrates 2110 at upper, lower, left and right sides, and the noise-reducing air duct 20 has two noise-reducing insert plates 220, and a porous sound-absorbing material 230 is further disposed at the side of the air chamber 23 to further enhance the noise-reducing effect of the noise-reducing air duct 20. Alternatively, porous sound absorbing material 230 may be disposed between the sound attenuating insert 220 and the side walls of the sound attenuating air duct 20.
In still another embodiment of the present application, as shown in fig. 12 and 13, the noise-reducing air duct 30 may be formed by combining a plurality of super-structure noise-reducing substrates 3110 on the upper side, the lower side, the left side and the right side, and the super-structure noise-reducing substrates 3110 are also provided on the front side and the rear side to further enhance the noise-reducing effect of the noise-reducing air duct 30. In this embodiment, the silencing air duct 30 has two silencing insert plates 320 symmetrically arranged, and a porous sound absorbing material 330 is further arranged at the side of the air cavity 33, so as to further improve the silencing effect of the silencing air duct 20. Optionally, the porous sound absorbing material 330 may be disposed between the sound absorbing insert 320 and the side wall of the sound absorbing duct 30, and between the front and rear super-structure sound absorbing substrates 3110, so as to form a better limit for the porous sound absorbing material 330, and avoid the displacement of the porous sound absorbing material 330 to affect the air circulation in the air cavity 33.
Fig. 14 shows a transmission loss curve of the muffling air duct 30. As can be seen from fig. 14, when the sound absorbing cotton with the thickness of 50mm and 100mm is filled in the sound absorbing air duct 30, the transmission loss is greater than 6dB in the sound wave frequency range of 400Hz to 1850Hz, so that the sound absorbing air duct has better sound absorbing effect. The corresponding noise elimination wind channel 30 has the following structural parameters: the length of the pipeline is 180mm, the width of the pipeline is 900mm, the number of the silencing inserting plates is 1, and the thickness of the filled cotton is 50mm and 100mm.
The application also provides a silencing air duct, which comprises a first end, a second end and an air cavity penetrating through the first end and the second end, wherein the first end and the second end are opposite; the silencing air duct is provided with a plurality of silencing modules in the extending direction of the air cavity, at least one resonant cavity is arranged in each silencing module, and each resonant cavity absorbs the energy of sound waves in the air cavity through resonance.
Optionally, the resonant cavity can be a Fabry-Perot resonant cavity, a helmholtz resonant cavity and a back cavity of the microperforated panel, and can also be a cavity between the elastic mode structure and the side wall of the silencing air duct, so that impedance matching modulation is realized through an acoustic-vibration coupling mechanism between the film structure and the cavity, and efficient sound absorption near the resonant frequency is realized.
The silencing air duct has the effects of reducing space occupation, reducing expansion ratio and reducing preparation difficulty by modularization based on the local resonance effect of each resonant cavity, can contain more types of resonant cavities, and is favorable for further meeting the customized design requirement of the silencing air duct.
The application also provides a system with the silencing air duct, and noise generated by gas disturbance in the system can be effectively reduced by using the silencing air duct in any embodiment.
In an embodiment of the present application, as shown in fig. 15 (with the upper part of the structure of the silencing air duct omitted), the system 1 includes the power generating device 40 and the silencing air ducts 10 as described above disposed at the air inlet and/or the air outlet of the power generating device 40, and each silencing air duct 10 is provided with a silencing insert 120 to further enhance the silencing effect. Where arrow D represents the direction of propagation of the sound wave (or wind). Optionally, second diversion portions 41 are further disposed on both sides of the inlet and outlet air of the power generating device 40 to reduce the regeneration noise of the air flow.
Alternatively, the power generation device 40 may include a compressor, oil press, engine, fan, or the like. Alternatively, the system may include an air conditioning system, a drive system, and the like.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A sound attenuation duct comprising a first end and a second end opposite to each other, and a wind cavity penetrating the first end and the second end;
it is characterized in that the method comprises the steps of,
the inside of the silencing air duct is provided with a plurality of resonant cavities, one side of the silencing air duct, facing the wind cavity, is provided with at least one communication part, and each resonant cavity is communicated with the wind cavity through the at least one communication part so as to absorb the energy of sound waves in the wind cavity through resonance;
wherein,
the silencing air duct is provided with a plurality of silencing modules in the extending direction of the air cavity, and at least one resonant cavity is arranged in at least one silencing module.
2. The muffling air duct of claim 1, wherein,
each silencing module is provided with an air inlet end, an air outlet end and a cavity penetrating through the air inlet end and the air outlet end, and the cavities are sequentially communicated to form the air cavity;
wherein,
each silencing module is provided with at least one communication part towards one side of the cavity of the silencing module, at least one resonant cavity is arranged in each silencing module, and each resonant cavity is communicated with the wind cavity through at least one communication part.
3. The muffling air duct of claim 1, wherein,
at least one of the silencing modules comprises a plurality of super-structure silencing substrates arranged along the circumferential direction of the silencing module;
wherein,
at least one super-structure noise elimination base plate is provided with at least one communication part towards one side of the wind cavity, and at least one super-structure noise elimination base plate is internally provided with at least one resonant cavity, and each resonant cavity is communicated with the wind cavity through at least one communication part.
4. The muffling air duct of claim 3, wherein,
at least one of the super-structure muffling substrates includes a plurality of helmholtz resonators including: the housing is provided with a first side and a second side which are oppositely arranged, the first side faces the wind cavity and is provided with at least one through hole; and at least one cannula, each cannula is connected with each through hole in a one-to-one correspondence manner and extends towards the second side;
at least one of the silencing modules comprises: the value range of the perforation rate of the through hole comprises 5% -40%; and/or the value range of the diameter of the through hole comprises 0.5 mm-20 mm; and/or the value range of the length of the cannula comprises 2 mm-20 mm.
5. The muffling air duct of claim 1, further comprising at least one muffling insert plate disposed in the air chamber;
wherein,
at least one communication part is respectively arranged on two sides of at least one silencing inserting plate, at least two resonant cavities are arranged in the at least one silencing inserting plate, and each resonant cavity is communicated with the wind cavity through at least one communication part.
6. The muffling air duct of claim 5, wherein at least one of the muffling insert plates comprises a plurality of super-structure muffling substrates arranged back-to-back, at least one communication portion is provided on one side of each super-structure muffling substrate exposed to the wind cavity, at least one resonant cavity is provided inside each super-structure muffling substrate, and each resonant cavity is communicated with the wind cavity through at least one communication portion.
7. The muffling air duct of claim 5, wherein,
at least one of the silencing inserting plates is provided with a flow guiding part, and the flow guiding part faces the first end and/or the second end; and/or the number of the groups of groups,
the number of at least one of the sound attenuation plugboards is smaller than or equal to a preset value.
8. The muffling air duct of claim 1, further comprising a porous sound absorbing material disposed laterally of the air chamber.
9. A sound attenuation duct comprising a first end and a second end opposite to each other, and a wind cavity penetrating the first end and the second end;
it is characterized in that the method comprises the steps of,
the silencing air duct is provided with a plurality of silencing modules in the extending direction of the air cavity, at least one resonant cavity is arranged in each silencing module, and each resonant cavity absorbs the energy of sound waves in the air cavity through resonance.
10. A system with a muffling air duct, wherein the muffling air duct is a muffling air duct according to any one of claims 1 to 9, the system further comprising a power generating device, the muffling air duct being provided at an air inlet and/or an air outlet of the power generating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320865509.7U CN220355675U (en) | 2023-04-18 | 2023-04-18 | Silencing air duct and system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320865509.7U CN220355675U (en) | 2023-04-18 | 2023-04-18 | Silencing air duct and system with same |
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| Publication Number | Publication Date |
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| CN220355675U true CN220355675U (en) | 2024-01-16 |
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|---|---|---|---|
| CN202320865509.7U Active CN220355675U (en) | 2023-04-18 | 2023-04-18 | Silencing air duct and system with same |
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| CN (1) | CN220355675U (en) |
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