CN102034470A - Reactive muffler for processing low-frequency noises - Google Patents
Reactive muffler for processing low-frequency noises Download PDFInfo
- Publication number
- CN102034470A CN102034470A CN2009103076251A CN200910307625A CN102034470A CN 102034470 A CN102034470 A CN 102034470A CN 2009103076251 A CN2009103076251 A CN 2009103076251A CN 200910307625 A CN200910307625 A CN 200910307625A CN 102034470 A CN102034470 A CN 102034470A
- Authority
- CN
- China
- Prior art keywords
- connecting pipe
- expansion chambers
- low
- board
- height
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Exhaust Silencers (AREA)
Abstract
The invention discloses a reactive muffler for processing low-frequency noises, which aims to provide a muffler capable of preventing low-frequency noises from passing through a cylinder and then spreading to the outside, and being favorable to preventing the low frequency noise pollution. The reactive muffler is characterized in that the inner portion of the cylinder is divided into a first expansion chamber and a second expansion chamber by a partition board; an upper connecting tube, a middle connecting tube and a lower connecting tube which are homocentric with the cylinder are arranged in the cylinder; and the cylinder is composed of an inner board, an outer board and an acoustic board filled between the inner board and the outer board, the inner board is provided with a plurality of sound-conducting holes, and the upper connecting tube and the lower connecting tube are respectively connected with an outdoor smoke tube by flanges. The reactive muffler disclosed by the invention has the advantages that the reactive sections of the reactive muffler are manufactured independently aiming at the sound level of a low-frequency sound source to select a rational expansion ratio, therefore, the low-frequency noises can be eliminated completely and the larger expansion ratios can be avoided, so that the reactive muffler can adapt to the field installation conditions; and the cylinder is composed of the inner board, the outer board and the acoustic board filled between the inner board and the outer board, and the acoustic board can prevent the low frequency noises from spreading to the outside through the cylinder, thereby enhancing the noise processing capability of the muffler.
Description
Technical field
The present invention relates to a kind of noise processing apparatus, in particular, relate to a kind of low-frequency noise and handle reactive muffler.
Background technology
At present, the seriousness of noise pollution more and more is familiar with by people, eliminates noise becomes environmental protection to the pollution of environment a big event.The chimney pneumatic noise is low frequency characteristic, low-frequency noise processing reactive muffler is installed can be eliminated the interference of low-frequency noise to environment.
Gong Ying impedance silencer is a combined type in the market, and promptly expansion and resistive part are integrated.Has certain limitation during use.And low-frequency noise is propagated to the external world by cylindrical shell easily, has reduced the ability of handling noise.
Summary of the invention
The present invention is in order to overcome weak point of the prior art, to provide a kind of low-frequency noise that can prevent to pass cylindrical shell and propagate to the external world, helping the low-frequency noise processing reactive muffler that prevents that low-frequency noise from polluting.
The present invention is achieved through the following technical solutions:
A kind of low-frequency noise is handled reactive muffler, it is characterized in that, comprise cylindrical shell, described inner barrel is divided into first order expansion chambers and second level expansion chambers by dividing plate, in cylindrical shell, be provided with cylindrical shell concentric on connecting pipe, middle connecting pipe and following connecting pipe, described cylindrical shell by inner panel, outside plate and be filled in inner panel and outside plate between acoustic board form, described inner panel is provided with a plurality of sound transmission aperture, the described connecting pipe of going up is connected with outdoor chimney by flange respectively with following connecting pipe.
The material of described acoustic board is any in glass wool, slag face, vapor-permeable type polyurethane, the rock cotton board.It is that 50-100mm, density are 60kg/m that described acoustic board adopts thickness
3Rock cotton board.
It is the punched steel plate of 1-1.5mm that described inner panel adopts thickness.
It is the steel plate of 4-6mm that described outside plate adopts thickness.
It is the steel plate of 4-6mm that described upward connecting pipe, middle connecting pipe and following connecting pipe adopt thickness respectively.
The divergence ratio of described cylindrical shell is not less than 5.
The length of first order expansion chambers is at 1/4th of the wavelength of the sound wave place frequency that will eliminate noise.Frequency as the noise sound wave is 125 hertz, and its wavelength is 2.76 meters, and quarter-wave is 0.69 meter about 0.7 meter.Second level expansion chambers generally will be eliminated 2 overtones bands of the frequency of noise at the front, get 250 hertz, 1.38 meters of wavelength, and quarter-wave is 0.35 meter.At different sound sources, need to measure the predominant frequency of sound source with frequency spectrograph.Therefore, can think that the height ratio of first order expansion chambers and second level expansion chambers approximately is 2: 1.The height that described connecting pipe down gos deep in the first order expansion chambers is 1/2nd of a first order expansion chambers height, the height that middle connecting pipe gos deep in the first order expansion chambers is 1/4th of a first order expansion chambers height, the height that last connecting pipe gos deep in the expansion chambers of the second level is 1/2nd of a second level expansion chambers height, and the height that middle connecting pipe gos deep in the expansion chambers of the second level is 1/4th of a second level expansion chambers height.
The present invention has following technique effect:
1, it is independent with the resistance section that low-frequency noise of the present invention is handled reactive muffler, at the sound level of low-frequency sound source, selects for use rational divergence ratio to make, and fully eliminates low-frequency noise, simultaneously, avoids bigger divergence ratio, to adapt to on-the-spot mounting condition.
2, the cylindrical shell that low-frequency noise of the present invention is handled reactive muffler by inner panel, outside plate and be filled in inner panel and outside plate between acoustic board forms, acoustic board can prevent that low-frequency noise from propagating to the external world by cylindrical shell, has strengthened the ability of processing noise.
Description of drawings
Fig. 1 handles the synoptic diagram of reactive muffler for low-frequency noise of the present invention;
Fig. 2 is the A-A cut-open view of Fig. 1.
Embodiment
Below in conjunction with the drawings and specific embodiments to the detailed description of the invention.
The synoptic diagram of low-frequency noise processing reactive muffler of the present invention as depicted in figs. 1 and 2, comprise cylindrical shell 3, cylindrical shell 1 inside is divided into first order expansion chambers 7 and second level expansion chambers 5 by dividing plate 6, in cylindrical shell 3, be provided with cylindrical shell concentric on connecting pipe 1, middle connecting pipe 2 and following connecting pipe 4, described cylindrical shell by inner panel 10, outside plate 8 and be filled in inner panel and outside plate between acoustic board 9 form, inner panel 10 is provided with a plurality of sound transmission aperture, and the described connecting pipe of going up is connected with outdoor chimney by flange respectively with following connecting pipe.The circulation area of cylindrical shell is called divergence ratio with the ratio of circular pipe area, and the divergence ratio of cylindrical shell is not less than 5.
The material of described acoustic board is any in glass wool, slag face, vapor-permeable type polyurethane, the rock cotton board.In order to reduce cost, it is that 50mm, density are 60kg/m that described acoustic board adopts thickness
3Rock cotton board.
It is the punched steel plate of 1-1.5mm that described inner panel 10 adopts thickness.It is the steel plate of 4-6mm that described outside plate 8 adopts thickness.It is the steel plate of 4-6mm that described upward connecting pipe, middle connecting pipe and following connecting pipe adopt thickness respectively.
Wherein, first order expansion chambers 7 is approximately 2: 1 with the height ratio of second level expansion chambers 5.The height of first expansion chambers is determined according to the frequency of the noise that will eliminate.The length of first order expansion chambers is at 1/4th of the wavelength of the sound wave place frequency that will eliminate noise.Frequency as the noise sound wave is 125 hertz, and its wavelength is 2.76 meters, and quarter-wave is 0.69 meter, about 0.7 meter.Second level expansion chambers generally will be eliminated 2 overtones bands of the frequency of noise at the front, get 250 hertz, 1.38 meters of wavelength, and quarter-wave is 0.35 meter.At different sound sources, need to measure the predominant frequency of sound source with frequency spectrograph.The height that described connecting pipe 4 down gos deep in the first order expansion chambers 7 is 1/2nd of a first order expansion chambers height, the height that middle connecting pipe 2 gos deep in the first order expansion chambers 7 are 1/4th of first order expansion chambers height, the height that last connecting pipe 1 gos deep in the second level expansion chambers 5 is 1/2nd of a second level expansion chambers height, and the height that middle connecting pipe 2 gos deep in the second level expansion chambers 5 is 1/4th of a second level expansion chambers height.
The smoke evacuation noise enters first expansion chambers by following connecting pipe, enters second expansion chambers by middle connecting pipe again, and the variation that utilizes sectional area expansion to take place and dwindle stops the transmission of sound wave.Simultaneously, the acoustic absorbant of installing in the cylindrical shell can stop sound wave to see through the propagation of steel plate cylindrical shell, thereby reaches the purpose of eliminating noise.
Although relate to a kind of low-frequency noise and handle reactive muffler and carried out special description disclosed with reference to embodiment, embodiment described above is illustrative and not restrictive, under the situation that does not break away from the spirit and scope of the present invention, all variations and modification are all within the scope of the present invention.
Claims (8)
1. a low-frequency noise is handled reactive muffler, it is characterized in that, comprise cylindrical shell, described inner barrel is divided into first order expansion chambers and second level expansion chambers by dividing plate, in cylindrical shell, be provided with cylindrical shell concentric on connecting pipe, middle connecting pipe and following connecting pipe, described cylindrical shell by inner panel, outside plate and be filled in inner panel and outside plate between acoustic board form, described inner panel is provided with a plurality of sound transmission aperture, the described connecting pipe of going up is connected with outdoor chimney by flange respectively with following connecting pipe.
2. low-frequency noise according to claim 1 is handled reactive muffler, it is characterized in that the material of described acoustic board is any in glass wool, slag face, vapor-permeable type polyurethane, the rock cotton board.
3. low-frequency noise according to claim 1 is handled reactive muffler, it is characterized in that, it is that 50-100mm, density are the rock cotton board of 60kg/m3 that described acoustic board adopts thickness.
4. low-frequency noise according to claim 1 is handled reactive muffler, it is characterized in that, it is the punched steel plate of 1-1.5mm that described inner panel adopts thickness.
5. low-frequency noise according to claim 1 is handled reactive muffler, it is characterized in that, it is the steel plate of 4-6mm that described outside plate adopts thickness.
6. low-frequency noise according to claim 1 is handled reactive muffler, it is characterized in that, it is the steel plate of 4-6mm that described upward connecting pipe, middle connecting pipe and following connecting pipe adopt thickness respectively.
7. low-frequency noise according to claim 1 is handled reactive muffler, it is characterized in that the divergence ratio of described cylindrical shell is not less than 5.
8. low-frequency noise according to claim 1 is handled reactive muffler, it is characterized in that, the height ratio of first order expansion chambers and second level expansion chambers is 2: 1, and the length of first order expansion chambers is at 1/4th of the wavelength of the sound wave place frequency that will eliminate noise; The height that described connecting pipe down gos deep in the first order expansion chambers is 1/2nd of a first order expansion chambers height, the height that middle connecting pipe gos deep in the first order expansion chambers is 1/4th of a first order expansion chambers height, the height that last connecting pipe gos deep in the expansion chambers of the second level is 1/2nd of a second level expansion chambers height, and the height that middle connecting pipe gos deep in the expansion chambers of the second level is 1/4th of a second level expansion chambers height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103076251A CN102034470A (en) | 2009-09-24 | 2009-09-24 | Reactive muffler for processing low-frequency noises |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103076251A CN102034470A (en) | 2009-09-24 | 2009-09-24 | Reactive muffler for processing low-frequency noises |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102034470A true CN102034470A (en) | 2011-04-27 |
Family
ID=43887275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103076251A Pending CN102034470A (en) | 2009-09-24 | 2009-09-24 | Reactive muffler for processing low-frequency noises |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102034470A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278183A (en) * | 2011-07-19 | 2011-12-14 | 南京航空航天大学 | Diesel engine exhaust silencer of composite structure |
| CN104299609A (en) * | 2014-09-28 | 2015-01-21 | 佛山市三水新明珠建陶工业有限公司 | Industrial novel silencer |
-
2009
- 2009-09-24 CN CN2009103076251A patent/CN102034470A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278183A (en) * | 2011-07-19 | 2011-12-14 | 南京航空航天大学 | Diesel engine exhaust silencer of composite structure |
| CN104299609A (en) * | 2014-09-28 | 2015-01-21 | 佛山市三水新明珠建陶工业有限公司 | Industrial novel silencer |
| CN104299609B (en) * | 2014-09-28 | 2017-06-30 | 佛山市三水新明珠建陶工业有限公司 | A kind of industrial Novel muffler |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204155604U (en) | A kind of dissipative muffler | |
| CN201546788U (en) | reactive muffler | |
| CN203743083U (en) | Fan silencer used for dust remover | |
| CN103850987A (en) | Fan muffler for dust remover | |
| CN200976264Y (en) | Impedance composite noise-abatement equipment | |
| CN102034470A (en) | Reactive muffler for processing low-frequency noises | |
| CA2647914C (en) | Silencer for adsorption-based gas separation systems | |
| CN104633372B (en) | Pipeline system flow noise suppression device and method broadening acoustic band gaps | |
| JP2013234808A (en) | Silencer for ventilation duct | |
| CN201984808U (en) | Muffler matched with oxygen concentrator | |
| CN105332953B (en) | A kind of fan inlet muffler | |
| CN202117739U (en) | Resistant/retardant combined type exhaust muffler | |
| CN212389932U (en) | Silencer for diffusing pipe | |
| CN204327348U (en) | A kind of pipeline high frequency silencing apparatus for turbosupercharger | |
| CN212407949U (en) | Blowpipe silencer | |
| CN104329139A (en) | Silencer of motorcycle exhausting system | |
| CN202047891U (en) | Gasoline exhaust muffler | |
| CN209278716U (en) | A kind of natural gas valve blowdown emptying silencing apparatus | |
| CN205845509U (en) | Multistage composite gradual change type environment friendly silencer | |
| CN210921759U (en) | Pipe type silencer | |
| CN201865884U (en) | Double layer noise reduction and explosion proof device | |
| CN204386710U (en) | A kind of silencing apparatus being applicable to inflammable gas discharge | |
| CN211788147U (en) | Novel combined type sound absorption screen muffler | |
| CN205977322U (en) | Novel multifrequency car silencer | |
| CN220821083U (en) | Metamaterial sound-absorbing board with sound wave opposite-impact function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110427 |