CN108800518B - Diffusion noise elimination device and ventilation channel noise elimination system - Google Patents
Diffusion noise elimination device and ventilation channel noise elimination system Download PDFInfo
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- CN108800518B CN108800518B CN201810998332.1A CN201810998332A CN108800518B CN 108800518 B CN108800518 B CN 108800518B CN 201810998332 A CN201810998332 A CN 201810998332A CN 108800518 B CN108800518 B CN 108800518B
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 102
- 238000009423 ventilation Methods 0.000 title claims abstract description 83
- 230000008030 elimination Effects 0.000 title claims abstract description 72
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 72
- 238000013016 damping Methods 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 21
- 230000030279 gene silencing Effects 0.000 claims description 19
- 239000007787 solid Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000011211 glass fiber reinforced concrete Substances 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 230000002238 attenuated effect Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
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- 238000010586 diagram Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The embodiment of the application provides a diffusion noise elimination device and a ventilation channel noise elimination system. The diffusion muffler device includes: the plurality of diffusion noise elimination units are arranged along the ventilation extending direction of the ventilation channel, the plurality of diffusion noise elimination units are arranged in parallel along the direction forming a preset angle with the ventilation extending direction of the ventilation channel, and a noise elimination channel is formed between two adjacent diffusion noise elimination units. Each diffusion sound damping unit comprises at least one diffusion body, and each diffusion body comprises a plurality of convex parts, so that sound waves are subjected to sound damping after being reflected in the sound damping channel for a plurality of times through the plurality of convex parts when entering the sound damping channel. The application does not need to use fiberization materials, is healthier and environment-friendly, effectively reduces the production cost, simultaneously, the diffuser is arranged to diffuse and reflect sound waves, and the sound is attenuated in the long and narrow channel through the repeated reflection of the sound waves, so that the low-frequency noise elimination performance in the ventilation channel is improved, and the ventilation noise elimination effect is further effectively realized.
Description
Technical Field
The application relates to the field of ventilation and noise elimination, in particular to a diffusion noise elimination device and a ventilation channel noise elimination system.
Background
At present, in the field of ventilation, noise elimination and noise reduction, the installation of a muffler is the most common and effective treatment measure. Generally, a muffler is a device that allows a smooth flow of air therethrough while effectively attenuating acoustic energy. The ventilation muffler is broadly classified into a resistive muffler, a resistive composite muffler, and a ventilation pressure relief muffler according to the difference of the noise elimination principle and structure thereof. The resistive muffler is the most widely used muffler in a ventilation and noise elimination system, and achieves the purpose of noise elimination by utilizing the mechanism that sound waves are dissipated by converting sound energy into heat energy through friction when the sound waves propagate in a sound absorption material or structure.
The installation of resistive mufflers is very common in practical engineering application, and the common mufflers include a sheet muffler, a matrix muffler, a folded plate muffler and various derivative products, and the noise elimination principle of the resistive muffler is to achieve the purpose of noise elimination by utilizing the sound absorption performance of fiber porous sound absorption materials. The inventors found in the study that such a muffler has typical sound damping characteristics of good mid-frequency sound damping performance, but has poor sound damping performance for low frequency bands due to the limitation of the fibrous porous sound absorbing material. For the high frequency band, the high frequency failure phenomenon of the resistive muffler also obviously reduces the noise reduction amount at the high frequency, for example, the inventor finds that the high frequency band also has a descending trend through testing, but the noise reduction amount of the high frequency basically meets the engineering requirement in the actual engineering due to the fact that the sound is fast attenuated at the high frequency along with the distance, but the noise reduction amount is smaller in the middle and low frequency bands, particularly the low frequency band. How to improve the low-frequency noise elimination performance in the ventilation channel and effectively realize the effects of ventilation, noise elimination and noise reduction is a technical problem to be solved urgently by the technicians in the field.
Content of the application
In order to overcome the above-mentioned shortcomings in the prior art, an object of the present application is to provide a diffusion muffler device and a ventilation channel muffler system, which solve or improve the above-mentioned problems.
In order to achieve the above object, the technical scheme adopted by the embodiment of the application is as follows:
In a first aspect, an embodiment of the present application provides a diffusion muffler device applied to a ventilation channel, the diffusion muffler device including:
The device comprises a ventilation channel, a plurality of diffusion silencing units and a plurality of sound attenuation units, wherein the diffusion silencing units are arranged along the ventilation extending direction of the ventilation channel and are arranged in parallel along the direction forming a preset angle with the ventilation extending direction of the ventilation channel, a silencing channel is formed between two adjacent diffusion silencing units, each diffusion silencing unit comprises at least one diffusion body, each diffusion body comprises a plurality of convex parts, and sound waves are attenuated after being reflected in the silencing channel for multiple times through the convex parts when entering the silencing channel.
Optionally, the predetermined angle is 90 degrees.
Optionally, the diffuser is made of a hard surface material, wherein the hard surface material comprises one or more of glass fiber reinforced gypsum, glass fiber reinforced concrete, wood material, and particle board material.
Optionally, two adjacent diffusers are fixedly connected through metal gasket bolts.
Optionally, the edge area between two adjacent diffusers is fixed with a metal card.
Optionally, the protrusion height of each protrusion of the diffuser ranges from 25mm to 250mm.
Optionally, the distance between two adjacent diffusion noise abatement units is in the range of 50mm-500mm.
Optionally, each convex part of the diffuser adopts one of a semi-cylinder with a cavity, a solid semi-cylinder, a rectangular body with a cavity, a solid rectangular body, a conical body with a cavity and a solid conical body.
Optionally, the diffusion noise elimination device further includes a fixing structure for fixing the diffusion noise elimination units arranged in parallel with the ventilation channel, the fixing structure includes a fixing rectangular tube, angle steel arranged on the fixing rectangular tube and used for fixing each diffusion noise elimination unit on the fixing rectangular tube, and expansion bolts arranged at two ends of the fixing rectangular tube and used for fixing two sides of the ventilation channel.
In a second aspect, an embodiment of the present application further provides a ventilation channel noise elimination system, where the ventilation channel noise elimination system includes the diffusion noise elimination device, and the diffusion noise elimination device is installed in a ventilation channel and is used for performing noise elimination treatment on sound waves entering the ventilation channel
Compared with the prior art, the application has the following beneficial effects:
The diffusion noise elimination device and the ventilation channel noise elimination system provided by the embodiment of the application comprise a plurality of diffusion noise elimination units which are arranged along the ventilation extending direction of the ventilation channel, wherein the diffusion noise elimination units are arranged in parallel along the direction forming a preset angle with the ventilation extending direction of the ventilation channel, and a noise elimination channel is formed between two adjacent diffusion noise elimination units. Each diffusion sound damping unit comprises at least one diffusion body, and each diffusion body comprises a plurality of convex parts, so that sound waves are subjected to sound damping after being reflected in the sound damping channel for a plurality of times through the plurality of convex parts when entering the sound damping channel. The design avoids using fiberization materials, is healthier and environment-friendly, and effectively reduces the production cost. Meanwhile, the diffusion body is arranged to diffuse and reflect sound waves, so that the sound waves are reflected for multiple times in a channel similar to the resistive muffler, and sound can be attenuated in the long and narrow channel through multiple reflection of the sound waves, so that the low-frequency noise elimination performance in the ventilation channel is improved, and the ventilation noise elimination and noise reduction effects are effectively achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a diffusion muffler device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a diffuser according to an embodiment of the present application;
FIG. 3 is a second schematic diagram of a diffuser according to an embodiment of the present application;
FIG. 4 is a third schematic diagram of a diffuser according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a diffuser according to an embodiment of the present application;
FIG. 6 is a fifth schematic diagram of a diffuser according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a diffuser according to an embodiment of the present application;
FIG. 8 is a schematic view of an installation structure of a diffusion muffler device according to an embodiment of the present application;
FIG. 9 is a second schematic view of an installation structure of a diffusion muffler according to an embodiment of the present application;
Fig. 10 is a schematic structural view of the fixing structure shown in fig. 8.
Icon: 100-diffusion muffler device; 110-a diffusion noise elimination unit; 120-diffuser; 130-a protrusion; 140-a fixed structure; 142-fixing the rectangular tube; 144-angle steel; 146-expansion bolts; 150-metal gasket bolts; 160-metal card; 200-ventilation channels.
Detailed Description
At present, in the field of ventilation, noise elimination and noise reduction, the installation of a muffler is the most common and effective treatment measure. Generally, a muffler is a device that allows a smooth flow of air therethrough while effectively attenuating acoustic energy. The ventilation muffler is broadly classified into a resistive muffler, a resistive composite muffler, and a ventilation pressure relief muffler according to the difference of the noise elimination principle and structure thereof. The resistive muffler is the most widely used muffler in a ventilation and noise elimination system, and achieves the purpose of noise elimination by utilizing the mechanism that sound waves are dissipated by converting sound energy into heat energy through friction when the sound waves propagate in a sound absorption material or structure.
The installation of resistive mufflers is very common in practical engineering application, and the common mufflers include a sheet muffler, a matrix muffler, a folded plate muffler and various derivative products, and the noise elimination principle of the resistive muffler is to achieve the purpose of noise elimination by utilizing the sound absorption performance of fiber porous sound absorption materials. The inventors found in the study that such a muffler has typical sound damping characteristics of good mid-frequency sound damping performance, but has poor sound damping performance for low frequency bands due to the limitation of the fibrous porous sound absorbing material. For the high frequency band, the high frequency failure phenomenon of the resistive muffler also obviously reduces the noise reduction amount at the high frequency, for example, the inventor finds that the high frequency band also has a descending trend through testing, but the noise reduction amount of the high frequency basically meets the engineering requirement in the actual engineering due to the fact that the sound is fast attenuated at the high frequency along with the distance, but the noise reduction amount is smaller in the middle and low frequency bands, particularly the low frequency band. How to improve the low-frequency noise elimination performance in the ventilation channel and effectively realize the effects of ventilation, noise elimination and noise reduction is a technical problem to be solved urgently by the technicians in the field.
In the process of realizing the technical scheme, the inventor discovers that the sound attenuation of the middle and low frequency bands can be increased by increasing the length of the muffler so as to meet the noise reduction requirement, but the production cost is increased. In addition, the fiber materials adopted at present can be transmitted to the air in the processing and using processes, so that the harm to surrounding personnel and the environment is generated, and the environment protection requirement is not met.
Based on the findings of the above technical problems, the present inventors have proposed the following examples to solve the above problems, and it should be noted that the above prior art solutions have all the drawbacks that the inventors have obtained after having been put into practice and studied carefully, and therefore, the finding process of the above problems and the solution proposed by the following examples of the present application to the above problems should be all contributions of the inventors to the present application in the process of the present application.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that some terms indicating an orientation or a positional relationship are based on the orientation or the positional relationship shown in the drawings or the orientation or the positional relationship conventionally put in use of the product of the application, only for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element to be 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 application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, a schematic structural diagram of a diffusion muffler device 100 according to an embodiment of the application is shown. In this embodiment, the diffusion muffler device 100 can be used in the field of ventilation and noise reduction, for example, can be installed in a ventilation channel to realize noise reduction in the ventilation channel, and it will be understood that those skilled in the art can apply the diffusion muffler device 100 to any other enclosed space around according to practical requirements.
As shown in fig. 1, the diffusion noise abatement device 100 may include a plurality of diffusion noise abatement units 110 (only four are shown in fig. 1) disposed along a ventilation extension direction of a ventilation passage, the plurality of diffusion noise abatement units 110 being arranged side by side in a direction at a predetermined angle to the ventilation extension direction of the ventilation passage, and a noise abatement passage being formed between two adjacent diffusion noise abatement units 110. Each diffusion sound damping unit 110 includes at least one diffuser 120 (only two are shown in fig. 1), and each diffuser 120 includes a plurality of lobes 130 (only 3 are shown in fig. 1) such that sound waves enter the sound damping channel and are acoustically damped after multiple reflections within the sound damping channel via the plurality of lobes 130.
It is understood that the specific number of the diffusion noise elimination units 110, the diffusers 120, and the protrusions 130 may be flexibly set according to actual requirements, which is not particularly limited in the present embodiment.
Based on the design, the diffuser structure is adopted, so that the use of fiberized materials is avoided, the environment is protected, and the production cost is effectively reduced. Meanwhile, the diffusion body is arranged to diffuse and reflect sound waves, so that the sound waves are reflected for multiple times in a channel similar to the resistive muffler, and sound can be attenuated in the long and narrow channel through multiple reflection of the sound waves, so that the low-frequency noise elimination performance in the ventilation channel is improved, and the ventilation noise elimination noise reduction effect is effectively achieved.
In this embodiment, the diffusion body 120 is distributed in such a manner that there is an influence on the diffusion of sound, and thus the diffusion noise elimination units 110 are arranged in such a direction that sound is sequentially propagated through the convex portions 130 of the diffusion body 120, for example, alternatively, in this embodiment, the predetermined angle may be 90 degrees, that is, a plurality of diffusion noise elimination units 110 may be arranged in parallel in a direction perpendicular to the ventilation extending direction of the ventilation passage. By this arrangement, the plurality of diffusion noise elimination units 110 can be made to diffuse sound waves more easily, and the arrangement space can be saved.
Alternatively, the diffuser 120 can be made from a hard surface material, wherein the hard surface material comprises one or more combinations of glass fiber reinforced gypsum, glass fiber reinforced concrete, wood material, and particleboard material. Of course, it is understood that in other embodiments, it is not excluded that the diffuser 120 may also be made of other hard surface materials, which are not particularly limited in this embodiment.
Alternatively, the shape of each protrusion 130 of the diffuser 120 may be set according to the scene requirement of the actual ventilation channel, for example, as shown in fig. 2, a semicylindrical body with a cavity may be used. For another example, referring to FIG. 3, a solid semi-cylinder may be used. For another example, referring to fig. 4, a rectangular body with a cavity may be used. For another example, referring to fig. 5, a solid rectangular body may be used. For another example, referring to FIG. 6, a tapered body with a cavity may be used. For another example, referring to FIG. 7, a solid cone may be used. It is understood that each of the convex portions 130 is not limited to the above-described several shapes in practical design.
The inventors found during the research that, in order to achieve effective sound diffusion, the size of the diffuser 120 should be comparable to the wavelength of the incident sound wave, and the shape and size of the surface of the diffuser 120 determine the diffusion frequency of the diffusion muffler device 100, for example, the inventors design the size of the diffuser 120 by summing up the following empirical formula through a large amount of test data:
2πf/c a≥4，b/a≥0.15
In the above formula, a is the width of the diffuser 120; b is the protrusion height of the diffuser 120; c is the sound velocity in air; f is the frequency of the sound wave. For example, the inventors found through testing that when a=0.17 m, b=0.04 m, the length of the diffusion muffler device 100 is 3m. When the diffuser 120 is made of a particle board, the test result of the diffusion muffler device 100 is:
The sound-absorbing capacity is 0-10dB, 800-2500 Hz, 10-20dB, 2500-6300 Hz, more than 20dB, and 6300-10000 Hz, 10-20dB. Experiments show that sound waves with frequencies between f/7 and f also have a certain diffusion effect, and as an embodiment, the sound waves can be used as the design basis of the diffuser 120.
As an embodiment, before the ventilation duct is actually installed, a single piece of diffuser 120 is first manufactured, and the surface shape of the diffuser 120 is determined according to the characteristics of the actual sound source and the noise reduction requirement, so as to manufacture a plurality of diffusers 120. Then, the plurality of diffusers 120 may be sequentially arranged into a row to form the diffusion noise reduction units 110, the longer the length direction is, the larger the attenuation is, the smaller the distance between the diffusion noise reduction units 110 is, and the larger the attenuation is. Finally, the upper and lower ends of the arranged diffusion noise elimination units 110 are closed, and noise elimination channels like a resistive muffler as shown in fig. 1 are formed between the different diffusion noise elimination units 110. In actual installation, a certain gap is left between the top of the diffusion muffler device 100 and the top of the ventilation duct.
Alternatively, in this embodiment, the protrusion height of each protrusion 130 of the diffuser 120 may range from 25mm to 250mm. As an embodiment, when the lower limit of the diffusion frequency is 200Hz, the protrusion height of each protrusion 130 of the diffuser 120 should be greater than 30mm.
Alternatively, in the present embodiment, when the ventilation rate is 50%, the distance between the adjacent two diffusion noise elimination units 110 may be in the range of 50mm to 500mm.
Optionally, with further reference to fig. 8, in this embodiment, two adjacent diffusers 120 may be fixedly connected by a metal spacer bolt 150.
Alternatively, still referring to FIG. 8, the edge regions between two adjacent diffusers 120 can be secured with metal clips 160.
Alternatively, referring to fig. 8 to 10 in combination, the diffusion noise abatement device 100 may further include a fixing structure 140 for fixing the plurality of diffusion noise abatement units 110 arranged side by side with the ventilation passage 200, and the fixing structure 140 may include a fixing rectangular pipe 142, angle steel 144 disposed on the fixing rectangular pipe 142 for fixing each diffusion noise abatement unit 110 on the fixing rectangular pipe 142, and expansion bolts 146 disposed at both ends of the fixing rectangular pipe 142 for fixing with both sides of the ventilation passage 200. With this arrangement, each diffusion noise elimination unit 110 can be fixed to the ventilation passage 200, thereby avoiding the diffusion noise elimination device 100 from changing its arrangement position under the action of wind, and thereby affecting the noise elimination and reduction effect.
Further, the embodiment of the application also provides a ventilation channel silencing system, which comprises the diffusion silencing device 100, wherein the diffusion silencing device 100 is arranged in the ventilation channel 200 and is used for silencing sound waves entering the ventilation channel 200.
In summary, the diffusion noise elimination device and the ventilation channel noise elimination system provided by the embodiments of the application include a plurality of diffusion noise elimination units disposed along the ventilation extension direction of the ventilation channel, the plurality of diffusion noise elimination units are arranged in parallel along the direction forming a predetermined angle with the ventilation extension direction of the ventilation channel, and a noise elimination channel is formed between two adjacent diffusion noise elimination units. Each diffusion sound damping unit comprises at least one diffusion body, and each diffusion body comprises a plurality of convex parts, so that sound waves are subjected to sound damping after being reflected in the sound damping channel for a plurality of times through the plurality of convex parts when entering the sound damping channel. The design avoids using fiberization materials, is healthier and environment-friendly, and effectively reduces the production cost. Meanwhile, the diffusion body is arranged to diffuse and reflect sound waves, so that the sound waves are reflected for multiple times in a channel similar to the resistive muffler, and sound can be attenuated in the long and narrow channel through multiple reflection of the sound waves, so that the low-frequency noise elimination performance in the ventilation channel is improved, and the ventilation noise elimination and noise reduction effects are effectively achieved.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. A diffusion muffler device for use in a ventilation passage, the diffusion muffler device comprising:
The device comprises a plurality of diffusion silencing units arranged along the ventilation extending direction of the ventilation channel, wherein the diffusion silencing units are arranged in parallel along the direction forming a preset angle with the ventilation extending direction of the ventilation channel, a silencing channel is formed between two adjacent diffusion silencing units, each diffusion silencing unit comprises at least one diffusion body, each diffusion body comprises a plurality of convex parts, so that sound waves are subjected to sound attenuation after being reflected in the silencing channel for multiple times through the convex parts when entering the silencing channel, and the low-frequency silencing performance in the ventilation channel is improved;
The dimensions of the diffuser satisfy:
2πf/c* a≥4，b/a≥0.15
Wherein a is the diffuser width; b is the protrusion height of the diffuser; c is the sound velocity in air; f is the frequency of the sound wave;
The diffuser is made of a hard surface material, wherein the hard surface material comprises one or a combination of more of glass fiber reinforced gypsum, glass fiber reinforced concrete, wood materials and particle board materials;
The diffusion noise elimination device further comprises a fixing structure for fixing the diffusion noise elimination units which are arranged in parallel with the ventilation channel, wherein the fixing structure comprises a fixing rectangular tube, angle steel used for fixing each diffusion noise elimination unit on the fixing rectangular tube and expansion bolts used for fixing two sides of the ventilation channel, and the angle steel is arranged on the fixing rectangular tube.
2. The diffusion muffler device of claim 1, wherein the predetermined angle is 90 degrees.
3. The diffusion muffler device of claim 1, wherein two adjacent diffusers are fixedly connected by a metal gasket bolt.
4. The diffusion muffler device of claim 1, wherein the edge area between two adjacent diffusers is secured with metal clips.
5. The diffusion muffler device of claim 1, wherein the protrusion height of each protrusion of the diffuser ranges from 25mm to 250mm.
6. The diffusion muffler device of claim 1, wherein the distance between two adjacent diffusion muffler units is in the range of 50mm to 500mm.
7. The diffusion muffler of claim 1, wherein each protrusion of the diffuser is shaped as one of a semi-cylinder with a cavity, a solid semi-cylinder, a rectangular body with a cavity, a solid rectangular body, a conical body with a cavity, and a solid conical body.
8. A ventilation channel sound damping system, characterized in that it comprises a diffusion sound damping device according to any one of claims 1-7, which is installed in a ventilation channel for damping sound waves entering the ventilation channel.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810998332.1A CN108800518B (en) | 2018-08-29 | 2018-08-29 | Diffusion noise elimination device and ventilation channel noise elimination system |
| PCT/CN2019/082956 WO2020042628A1 (en) | 2018-08-29 | 2019-04-17 | Diffusion muffler, diffusion resonance muffler, full-spectrum diffusion muffler, muffling system of ventilation channel, and muffling method thereof |
| US16/621,554 US11536487B2 (en) | 2018-08-29 | 2019-04-17 | Diffusion muffling device, diffusion resonance muffling device, full-frequency diffusion muffling device, muffling system for ventilation channel, and muffling method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810998332.1A CN108800518B (en) | 2018-08-29 | 2018-08-29 | Diffusion noise elimination device and ventilation channel noise elimination system |
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| CN108800518A CN108800518A (en) | 2018-11-13 |
| CN108800518B true CN108800518B (en) | 2024-05-17 |
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| US11536487B2 (en) | 2018-08-29 | 2022-12-27 | Zheng Sheng Environmental Technology Co., Ltd. | Diffusion muffling device, diffusion resonance muffling device, full-frequency diffusion muffling device, muffling system for ventilation channel, and muffling method using the same |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2759556A (en) * | 1952-08-04 | 1956-08-21 | Bolt Beranek & Newman | Acoustic method and system |
| US3949827A (en) * | 1975-04-24 | 1976-04-13 | Owens-Corning Fiberglas Corporation | Acoustical panel assembly |
| US5696361A (en) * | 1995-11-13 | 1997-12-09 | Chen; Chia-Hsien | Multi-ducts sound eliminator for air pipe |
| EP2022678A2 (en) * | 2007-08-06 | 2009-02-11 | Mazda Motor Corporation | Sound-absorbing material, production method for sound-absorbing material, and sound-absorbing structure |
| CN203518178U (en) * | 2013-09-11 | 2014-04-02 | 珠海格力电器股份有限公司 | Silencer and ducted air conditioning unit with same |
| CN104949313A (en) * | 2015-06-30 | 2015-09-30 | 成都普创通信技术股份有限公司 | Noise eliminating column structure for noise eliminator |
| CN106328113A (en) * | 2016-10-24 | 2017-01-11 | 株洲壹星智能风源科技有限公司 | Open type silencer and silencing method |
| CN108458467A (en) * | 2017-02-17 | 2018-08-28 | S.I.Pan公司 | Separator and silencer including the separator |
| CN208936496U (en) * | 2018-08-29 | 2019-06-04 | 正升环境科技股份有限公司 | Spread silencing apparatus and vent passages sound-attenuating system |
-
2018
- 2018-08-29 CN CN201810998332.1A patent/CN108800518B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2759556A (en) * | 1952-08-04 | 1956-08-21 | Bolt Beranek & Newman | Acoustic method and system |
| US3949827A (en) * | 1975-04-24 | 1976-04-13 | Owens-Corning Fiberglas Corporation | Acoustical panel assembly |
| US5696361A (en) * | 1995-11-13 | 1997-12-09 | Chen; Chia-Hsien | Multi-ducts sound eliminator for air pipe |
| EP2022678A2 (en) * | 2007-08-06 | 2009-02-11 | Mazda Motor Corporation | Sound-absorbing material, production method for sound-absorbing material, and sound-absorbing structure |
| CN203518178U (en) * | 2013-09-11 | 2014-04-02 | 珠海格力电器股份有限公司 | Silencer and ducted air conditioning unit with same |
| CN104949313A (en) * | 2015-06-30 | 2015-09-30 | 成都普创通信技术股份有限公司 | Noise eliminating column structure for noise eliminator |
| CN106328113A (en) * | 2016-10-24 | 2017-01-11 | 株洲壹星智能风源科技有限公司 | Open type silencer and silencing method |
| CN108458467A (en) * | 2017-02-17 | 2018-08-28 | S.I.Pan公司 | Separator and silencer including the separator |
| CN208936496U (en) * | 2018-08-29 | 2019-06-04 | 正升环境科技股份有限公司 | Spread silencing apparatus and vent passages sound-attenuating system |
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| CN108800518A (en) | 2018-11-13 |
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