CN106782479A - A kind of simple Foamed-aluminum silencer - Google Patents
A kind of simple Foamed-aluminum silencer Download PDFInfo
- Publication number
- CN106782479A CN106782479A CN201611216053.2A CN201611216053A CN106782479A CN 106782479 A CN106782479 A CN 106782479A CN 201611216053 A CN201611216053 A CN 201611216053A CN 106782479 A CN106782479 A CN 106782479A
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- Prior art keywords
- foamed aluminium
- foamed
- silencer
- cylindrical shell
- perforated pipe
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Exhaust Silencers (AREA)
Abstract
The present invention provides a kind of simple Foamed-aluminum silencer, including hollow cylindrical shell, one end of cylindrical shell is provided with silencer entrance, the other end is provided with muffler outlet, perforated pipe and two foamed aluminium boards are provided with cylindrical shell, foamed aluminium board is the foamed aluminium board of perforate, two foamed aluminium boards with the axis perpendicular of cylindrical shell, and fixation is closed between the inwall of two foamed aluminium boards and cylindrical shell, perforated pipe is coaxially disposed with cylindrical shell, and the two ends of perforated pipe are each passed through two foamed aluminium boards, sound attenuation hole is offered on perforated pipe between two foamed aluminium boards.Environmental pollution easily caused to solve existing silencer material, be detrimental to health, and the easily moisture absorption, weathering, service life is short, the problems such as effect difference.The invention belongs to silencer technical field.
Description
Technical field
Used cooperatively as internal noise elimination structure using Open-cell Aluminum Foam hollow circular plate and perforated pipe the present invention relates to a kind of
Silencer, belongs to silencer technical field.
Background technology
Conventional muffler is frequently with solid and perforation steel plate is as noise elimination structure or uses the porous resistances such as mineral wool, rock wool
Property deadener eliminate noise, but solid and perforation plate quality is big, be unfavorable for the light-weight design of product, and itself
Do not absorb sound, mainly by the viscosity of sound wave roundtrip and gas come sound wave of decaying.Resistance noise reduction material is easily made
Into environmental pollution, be detrimental to health and bring the moisture absorption, easy weathering, short life the problems such as, use anaphase effect increasingly
Difference, the noise pollution to environment can also be aggravated.
The content of the invention
It is an object of the invention to：A kind of simple Foamed-aluminum silencer is provided, is easily caused with solving existing silencer material
Environmental pollution, it is detrimental to health, and the easily moisture absorption, weathering, service life is short, the problems such as effect difference.
To solve the above problems, intend using the simple Foamed-aluminum silencer of such a, including hollow cylindrical shell, cylinder
One end of shell is provided with silencer entrance, and the other end is provided with muffler outlet, and perforated pipe and two are provided with cylindrical shell
Individual foamed aluminium board, foamed aluminium board is the foamed aluminium board of perforate, two foamed aluminium boards with the axis perpendicular of cylindrical shell, and two
Closed between the inwall of individual foamed aluminium board and cylindrical shell and fixed, perforated pipe is coaxially disposed with cylindrical shell, and perforated pipe two ends
Two foamed aluminium boards are each passed through, sound attenuation hole is offered on the perforated pipe between two foamed aluminium boards.
In foregoing foams aluminium silencer, foamed aluminium board middle part offers through hole, and perforated pipe is arranged on through hole；
In foregoing foams aluminium silencer, cylindrical shell is steel shell, and silencer entrance and muffler outlet are and circle
The coaxial borehole structure of post shell；
In order to make full use of the noise elimination feature of perforated tube silencer, because the airflow velocity ratio for having just enter into silencer is very fast,
Reduce flow velocity with one section of cavity more long, strengthen acoustical absorptivity, the distance between two foamed aluminium boards are more than silencer entrance
To the minimum range of foamed aluminium board, the minimum range of silencer entrance to foamed aluminium board arrives foamed aluminium board more than muffler outlet
Minimum range, for coordinating the noise elimination of final stage, sets different cavity lengths and for avoiding reactive muffler
The shortcoming of acoustic attenuation performance difference in some frequency ranges；
In foregoing foams aluminium silencer, perforated pipe passes through the length near the foamed aluminium board of silencer entrance to be more than perforated pipe
Through the length of the foamed aluminium board near muffler outlet；
In foregoing foams aluminium silencer, the porosity on perforated pipe between two foamed aluminium boards is 4%~16%, can root
Be adjusted according to different demands, the principle of adjustment is bigger porosity, its function closer to expansion chamber silencer characteristic, hole
Gap rate is smaller closer to the characteristic for leading directly to not perforated pipe；
In foregoing foams aluminium silencer, foamed aluminium board oozes method and prepares using pressure, or is steeped by closed pore prepared by foam melt method
Foam aluminum makes, and closed-cell aluminum foam carries out punching treatment, to form the duct of connection in foamed aluminium disk.
The foamed aluminium of perforate due to its structure in itself the characteristics of, there are superior sound absorbing capabilities in medium-high frequency domain, fit through
Hole pipe is used, and can obtain good comprehensive acoustical absorptivity.Acoustical absorptivity is most strong when the porosity of foamed aluminium is 0.75 or so, because
This also has the advantage of light weight.Meanwhile, the harmful defect of the sound-absorbing materials such as mineral wool is which overcomed, with higher strong
Degree, voltage endurance capability and switching performance.Research shows that foamed aluminium can realize excellent acoustical behavior by rational textural association,
Foamed aluminium can have good application in silencer.The present invention is a kind of using Open-cell Aluminum Foam plectane and perforated pipe as interior
, with the use of the silencer for raising acoustic attenuation performance, with simple structure, quality is relatively light for portion's sound absorption structure, frequency of eliminating the noise
Field width, the features such as comprehensive acoustic attenuation performance is good.
Compared with prior art, the present invention uses the foamed aluminium material with through hole as noise elimination structure, has both played porous
Material acoustical absorptivity in itself, absorbs sound further through resonant structure, and change by gas channel area has reactive muffling concurrently
Some characteristics, low frequency soundproof effect is good, anechoic frequency bandwidth；By three sections of muffler cavities come sound wave of decaying, and utilize foamed aluminium
The acoustic characteristicses of plate and perforated pipe, play its noise elimination advantage；Present invention, avoiding the porous resistance noise reduction material such as mineral wool, rock wool
Environmental pollution is easily caused, is detrimental to health and the problems such as the moisture absorption, easy weathering, short life, also solve general resistance noise elimination
The problem that device complex structure, volume are big, quality is big, frequency is narrow, cost is high.Foamed aluminium material sheet is used as metal material
In it is pollution-free, be difficult the moisture absorption and weathering, last a long time.
Brief description of the drawings
Fig. 1 is Foamed-aluminum silencer structural representation of the present invention；
Fig. 2 is foamed aluminium board front elevation；
Fig. 3 moves towards schematic diagram for Foamed-aluminum silencer air-flow of the present invention；
Fig. 4 is that Foamed-aluminum silencer sound wave of the present invention reflects schematic diagram.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, further will be made to invention by accompanying drawing below
Ground is described in detail.
Embodiment：
Referring to figs. 1 to Fig. 4, the present embodiment provides a kind of simple Foamed-aluminum silencer, including hollow cylindrical shell 1, circle
One end of post shell 1 is provided with silencer entrance 11, and the other end is provided with muffler outlet 12, and cylindrical shell 1 is steel shell,
Silencer entrance 11 and muffler outlet 12 are in the borehole structure coaxial with cylindrical shell 1, cylindrical shell 1 and are provided with perforation
Pipe 2 and two foamed aluminium boards 3, foamed aluminium board 3 are the foamed aluminium board of perforate, and oozing method using pressure prepares, or by flux foaming legal system
Standby closed-cell aluminum foam makes, and closed-cell aluminum foam carries out punching treatment, to form the hole of connection in foamed aluminium disk
Road, two foamed aluminium boards 3 are between the axis perpendicular of cylindrical shell 1, and the inwall of two foamed aluminium boards 3 and cylindrical shell 1
Closing is fixed, and perforated pipe 2 is coaxially disposed with cylindrical shell 1, offers through hole 31 in the middle part of foamed aluminium board 3, and perforated pipe 2 two ends
Two foamed aluminium boards 3 are passed through by through hole 31 respectively, sound attenuation hole 21 is offered on the perforated pipe 2 between two foamed aluminium boards 3.
More than the minimum range of silencer entrance 11 to foamed aluminium board 3, silencer enters the distance between two foamed aluminium boards 3
Mouth 11 arrives the minimum range of foamed aluminium board 3 to the minimum ranges of foamed aluminium board 3 more than muffler outlet 12, and perforated pipe 2 is passed through and leaned on
The length of the foamed aluminium board 3 of nearly silencer entrance 11 passes through the foamed aluminium board 3 near muffler outlet 12 slightly larger than perforated pipe 2
Length, the porosity on perforated pipe 2 between two foamed aluminium boards 3 is 4%~20%.
When noise gas passes through silencer entrance 11, sound wave mainly experiences three attenuation processes：
First, sound wave enters silencer entrance 11 and the cavity between the foamed aluminium board 3 of silencer entrance 11, according to
The noise-cancelling theory of expansion chamber, sound wave causes border impedance mismatching through the unit of cross-sectional area mutation, and sound wave reflects, noise
Obtain part decay；
Afterwards, a part of sound wave passes through the foamed aluminium board 3 of perforate, due to foamed aluminium good acoustical absorptivity in itself, sound wave
Further decayed；Another part sound wave enters middle perforated pipe 2, forms a reactive muffler, and sound wave is obtained into one
Step decay；Sound wave in some perforated pipe 2 enters perforated pipe 2 and cylindrical shell 1 and two foams by sound attenuation hole 21
Cavity between aluminium sheet 3, according to perforated pipe noise-cancelling theory, sound wave is also further decayed；
Finally, a part of sound wave pass through near muffler outlet 12 foamed aluminium board 3, into muffler outlet 12 be close to
Cavity between the foamed aluminium board 3 of muffler outlet 12, sound wave is decayed again.
The main SATT mechanism that the present invention is present has 2 kinds：1. airflow passes cross-sectional area chamber jumpy or
The impedance mismatching that cavity causes, has reached the effect of decay sound wave；2. foamed aluminium is a kind of good sound-absorbing material, and air-flow is from bubble
When through hole on foam aluminium ellipse and perforated pipe flows through, due to skeleton vibration, the viscosity of air, friction, heat exchange etc. because
Element, noise can substantially be decayed.
Claims (7)
1. a kind of simple Foamed-aluminum silencer, including hollow cylindrical shell (1), it is characterised in that：One end of cylindrical shell (1)
Silencer entrance (11) is provided with, the other end is provided with muffler outlet (12), cylindrical shell (1) and is provided with perforated pipe (2)
With two foamed aluminium boards (3), foamed aluminium board (3) is the foamed aluminium board of perforate, two foamed aluminium boards (3) with cylindrical shell (1)
Axis perpendicular, and closed between the inwall of two foamed aluminium boards (3) and cylindrical shell (1) and fixed, outside perforated pipe (2) and cylinder
Shell (1) is coaxially disposed, and the two ends of perforated pipe (2) are each passed through two foamed aluminium boards (3), between two foamed aluminium boards (3)
Sound attenuation hole (21) is offered on perforated pipe (2).
2. a kind of simple Foamed-aluminum silencer according to claim 1, it is characterised in that：Foamed aluminium board (3) middle part offers
Through hole (31), perforated pipe (2) is arranged on through hole (31).
3. a kind of simple Foamed-aluminum silencer according to claim 1, it is characterised in that：Cylindrical shell (1) is steel shell,
Silencer entrance (11) and muffler outlet (12) are the borehole structure coaxial with cylindrical shell (1).
4. a kind of simple Foamed-aluminum silencer according to claim 1, it is characterised in that：Between two foamed aluminium boards (3)
Distance more than silencer entrance (11) to foamed aluminium board (3) minimum range, silencer entrance (11) to foamed aluminium board (3) most
Minimum range of the small distance more than muffler outlet (12) to foamed aluminium board (3).
5. a kind of simple Foamed-aluminum silencer according to claim 1, it is characterised in that：Perforated pipe 2 is passed through near silencer
The length of the foamed aluminium board (3) of entrance (11) is more than perforated pipe (2) through the foamed aluminium board (3) near muffler outlet (12)
Length.
6. a kind of simple Foamed-aluminum silencer according to claim 1, it is characterised in that：Between two foamed aluminium boards (3)
Porosity on perforated pipe (2) is 4%~16%.
7. a kind of simple Foamed-aluminum silencer according to claim 1, it is characterised in that：Foamed aluminium board (3) oozes method by pressure
Prepare, or made by closed-cell aluminum foam prepared by foam melt method, closed-cell aluminum foam carries out punching treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611216053.2A CN106782479B (en) | 2016-12-26 | 2016-12-26 | Simple foam aluminum muffler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611216053.2A CN106782479B (en) | 2016-12-26 | 2016-12-26 | Simple foam aluminum muffler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106782479A true CN106782479A (en) | 2017-05-31 |
| CN106782479B CN106782479B (en) | 2023-05-05 |
Family
ID=58925743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611216053.2A Active CN106782479B (en) | 2016-12-26 | 2016-12-26 | Simple foam aluminum muffler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106782479B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106782480A (en) * | 2016-12-26 | 2017-05-31 | 贵州大学 | A kind of binary channels Foamed-aluminum silencer |
| CN107550332A (en) * | 2017-10-31 | 2018-01-09 | 辽宁融达新材料科技有限公司 | A kind of cooking machine motor noise-reducing device |
| CN107785008A (en) * | 2017-10-31 | 2018-03-09 | 辽宁融达新材料科技有限公司 | Foamed aluminium sound-absorbing piece and chip muffler assembly |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002065447A2 (en) * | 2001-02-09 | 2002-08-22 | Dow Global Technologies Inc. | Sound absorbing foam |
| CN201723278U (en) * | 2010-05-28 | 2011-01-26 | 东北大学 | Foamed-aluminum silencer |
| CN201984807U (en) * | 2010-12-16 | 2011-09-21 | 上海众维新型材料有限公司 | Assembled silencer |
| CN106782480A (en) * | 2016-12-26 | 2017-05-31 | 贵州大学 | A kind of binary channels Foamed-aluminum silencer |
| CN206558210U (en) * | 2016-12-26 | 2017-10-13 | 贵州大学 | A kind of simple Foamed-aluminum silencer |
-
2016
- 2016-12-26 CN CN201611216053.2A patent/CN106782479B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002065447A2 (en) * | 2001-02-09 | 2002-08-22 | Dow Global Technologies Inc. | Sound absorbing foam |
| CN201723278U (en) * | 2010-05-28 | 2011-01-26 | 东北大学 | Foamed-aluminum silencer |
| CN201984807U (en) * | 2010-12-16 | 2011-09-21 | 上海众维新型材料有限公司 | Assembled silencer |
| CN106782480A (en) * | 2016-12-26 | 2017-05-31 | 贵州大学 | A kind of binary channels Foamed-aluminum silencer |
| CN206558210U (en) * | 2016-12-26 | 2017-10-13 | 贵州大学 | A kind of simple Foamed-aluminum silencer |
Non-Patent Citations (3)
| Title |
|---|
| H.R.ZAREI: "optimization of the foam filled alumnium tubes for crush box application", 《THIN- WALLED STRUCTURES》 * |
| 牛燕飞: "通孔式消声器吸声材料及其消声特性的研究", 《中国优秀硕士学位论文全文数据库（工程科技Ⅱ辑）》 * |
| 陈文清: "多孔材料参数反演及其在消声器仿真中的应用", 《中国优秀硕士学位论文全文数据库（工程科技Ⅰ辑）》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106782480A (en) * | 2016-12-26 | 2017-05-31 | 贵州大学 | A kind of binary channels Foamed-aluminum silencer |
| CN106782480B (en) * | 2016-12-26 | 2023-06-16 | 贵州大学 | Binary channels foam aluminium silencer |
| CN107550332A (en) * | 2017-10-31 | 2018-01-09 | 辽宁融达新材料科技有限公司 | A kind of cooking machine motor noise-reducing device |
| CN107785008A (en) * | 2017-10-31 | 2018-03-09 | 辽宁融达新材料科技有限公司 | Foamed aluminium sound-absorbing piece and chip muffler assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106782479B (en) | 2023-05-05 |
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