CN106782485B - Impedance composite muffler - Google Patents
Impedance composite muffler Download PDFInfo
- Publication number
- CN106782485B CN106782485B CN201611018359.7A CN201611018359A CN106782485B CN 106782485 B CN106782485 B CN 106782485B CN 201611018359 A CN201611018359 A CN 201611018359A CN 106782485 B CN106782485 B CN 106782485B
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- pipeline
- cavity
- shell
- partition plate
- absorption layer
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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
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
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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
-
- 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
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention discloses an impedance composite muffler, which comprises a shell, a partition plate, a first pipeline and a second pipeline, wherein a cavity is arranged in the shell, an air inlet and an air outlet are formed in the shell, the partition plate is arranged in the cavity to divide the cavity into a first cavity and a second cavity, a sound absorption layer is arranged on the inner wall of the second cavity, one end of the first pipeline is communicated with the air inlet, the other end of the first pipeline penetrates through the partition plate and extends into the second cavity, the second pipeline is arranged in the second cavity, one end of the second pipeline is arranged on the shell, the other end of the second pipeline penetrates through the partition plate and extends into the first cavity, a through hole is formed in the pipe wall of the second pipeline, and the air outlet is communicated with the first cavity. The impedance composite muffler provided by the invention can eliminate low, medium and high frequency noises, and has the advantages of simple structure and good muffling effect.
Description
Technical Field
The invention relates to the technical field of silencers, in particular to an impedance composite silencer.
Background
A muffler is a device that prevents sound from propagating while allowing airflow to pass through, and is an important measure for eliminating aerodynamic noise. More sophisticated exhaust mufflers of the prior art may be primarily separate resistive and resistive mufflers. The resistive muffler utilizes a resistive sound absorption material, is attached to the wall of a rigid pipeline for sound wave propagation, and can enable most of high-frequency sound waves to enter the material, so that the sound waves are gradually consumed, and the effect on high-frequency noise is better. The reactive muffler mainly bypasses a resonant cavity on the pipeline or changes the area of the pipeline suddenly, has selectivity for sound waves with different frequencies, enables the sound waves to have reflection, interference and other phenomena in the pipeline, and has a good muffling effect for low and medium frequency noise. The resistive muffler and the reactive muffler are used independently, so that the noises in different frequency bands in the exhaust noise cannot be effectively eliminated, the noise elimination effect of the muffler is greatly reduced, and the expected effect cannot be achieved. At present, although some manufacturers research and develop and improve the impedance composite type eliminator, the structural design is complex, and the silencing effect is still not ideal.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the impedance composite muffler is simple in structure and good in muffling effect.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides an impedance combined type silencer, includes casing, baffle, first pipeline and second pipeline, be equipped with a cavity in the casing, be equipped with air inlet and gas outlet on the casing, the baffle sets up separate the cavity for first cavity and second cavity in the cavity, be equipped with the sound-absorbing layer on the inner wall of second cavity, the one end of first pipeline with the air inlet intercommunication, the other end of first pipeline passes the baffle and stretches into in the second cavity, the second pipeline sets up in the second cavity, the one end setting of second pipeline is in on the casing, the other end of second pipeline passes the baffle and stretches into in the first cavity, is equipped with the through-hole on the pipe wall of second pipeline, gas outlet and first cavity intercommunication set up.
The invention has the beneficial effects that: the gas enters the second cavity from the first pipeline, enters the cavity with larger sectional area from the pipeline with smaller sectional area, the sectional area changes, the sound wave which is transmitted forwards interferes with the sound wave reflected by each wall surface by depending on the length of the first pipeline and the sudden change of the section of the pipeline, so as to weaken low and medium frequency noise, the sound absorption layer is arranged on the inner wall of the second cavity, the gas rubs with the sound absorption layer, the sound energy is converted into heat energy to be radiated, so as to reduce high frequency noise, the gas which enters the second cavity enters the second pipeline through the through hole on the second pipeline, the gas in the second pipeline enters the first cavity, the low, medium and high frequency noise is further eliminated by the length of the second pipeline and the sudden change of the section of the pipeline, so as to achieve the effect of reducing noise, and the gas which enters the first cavity is then discharged from the gas outlet, the impedance composite muffler of the invention, not only simple structure, noise elimination effect is good moreover.
Drawings
Fig. 1 is a sectional view of an impedance composite muffler according to an embodiment of the present invention.
Description of reference numerals:
1. a housing; 11. a left end cap; 12. a side wall; 13. a right end cap; 2. a partition plate; 3. a first conduit; 4. a second conduit; 41. an inner conduit; 42. an outer conduit; 5. a first cavity; 6. a second cavity; 7. a sound absorbing layer; 8. an inner housing; 9. and (4) exhausting the gas.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
The most key concept of the invention is as follows: a plurality of pipelines and a plurality of cavities with different volumes are arranged in the shell, and the purpose of silencing is achieved through the reflection, interference and friction of sound waves in the pipelines and the cavities.
Referring to fig. 1, an impedance composite muffler includes a housing 1, a partition plate 2, a first pipe 3 and a second pipe 4, where the housing 1 is provided with a cavity, the housing 1 is provided with an air inlet and an air outlet, the partition plate 2 is disposed in the cavity to separate the cavity into a first cavity 5 and a second cavity 6, the inner wall of the second cavity 6 is provided with a sound absorbing layer 7, one end of the first pipe 3 is communicated with the air inlet, the other end of the first pipe 3 penetrates through the partition plate 2 and extends into the second cavity 6, the second pipe 4 is disposed in the second cavity 6, one end of the second pipe 4 is disposed on the housing 1, the other end of the second pipe 4 penetrates through the partition plate 2 and extends into the first cavity 5, a through hole is disposed on a pipe wall of the second pipe 4, and the air outlet is communicated with the first cavity 5.
From the above description, the beneficial effects of the present invention are: the gas enters the second cavity from the first pipeline, enters the cavity with larger sectional area from the pipeline with smaller sectional area, the sectional area changes, the sound wave which is transmitted forwards interferes with the sound wave reflected by each wall surface by depending on the length of the first pipeline and the sudden change of the section of the pipeline, so as to weaken low and medium frequency noise, the sound absorption layer is arranged on the inner wall of the second cavity, the gas rubs with the sound absorption layer, the sound energy is converted into heat energy to be radiated, so as to reduce high frequency noise, the gas which enters the second cavity enters the second pipeline through the through hole on the second pipeline, the gas in the second pipeline enters the first cavity, the low, medium and high frequency noise is further eliminated by the length of the second pipeline and the sudden change of the section of the pipeline, so as to achieve the effect of reducing noise, and the gas which enters the first cavity is then discharged from the gas outlet, the impedance composite muffler of the invention, not only simple structure, noise elimination effect is good moreover.
Further, a sound absorption layer 7 is arranged on the inner wall of the second pipeline 4.
As can be seen from the above description, the sound absorption layer is arranged on the inner wall of the second pipeline, so that the noise can be further reduced, and the noise elimination effect is improved.
Further, the second pipe 4 comprises an inner pipe 41 and an outer pipe 42, the outer pipe 42 is sleeved outside the inner pipe 41, and the sound absorption layer 7 is filled between the inner pipe 41 and the outer pipe 42.
As can be seen from the above description, the inner pipeline and the outer pipeline are respectively provided with the through holes, and the air passes through the through holes on the inner pipeline and the outer pipeline to convert the noise into heat energy, thereby playing a role in reducing the noise.
Further, the cross-sectional area of one end of the first pipe 3 communicating with the gas inlet is smaller than that of the other end of the first pipe 3.
As can be seen from the above description, when the gas in the first pipe flows from the end with a small cross-sectional area to the end with a large cross-sectional area, the gas expands, which reduces the gas flow speed and pressure, and makes the gas flow smoothly.
Further, the cross-sectional area of one end of the second pipe 4 extending into the first cavity 5 is smaller than that of the other end of the second pipe 4.
As is clear from the above description, when the gas in the second duct flows from the end having a small cross-sectional area to the end having a large cross-sectional area, the gas merges and squeezes, and the pulsation amplitude of the gas can be reduced.
Further, the sound absorption layer 7 is made of glass fiber.
Further, the housing 1 includes a left end cover 11, a side wall 12 and a right end cover 13, the left end cover 11, the side wall 12 and the right end cover 13 enclose the cavity, the air inlet is disposed on the left end cover 11, and the air outlet is disposed on the side wall 12.
Further, still include interior casing 8, interior casing 8 is for having the open-ended hollow structure, and interior casing 8 sets up in the second cavity 6, it has sound-absorbing layer 7 to fill between casing 1 and the interior casing 8, is equipped with the through-hole on the interior casing 8.
As can be seen from the above description, the through holes are formed in the inner shell, so that the gas in the second cavity enters the sound absorption layer through the through holes and rubs and collides with the sound absorption layer to reduce noise.
Further, still include blast pipe 9, the one end of blast pipe 9 with the gas outlet intercommunication, the other end of blast pipe 9 stretches into in the first cavity 5 and with first cavity 5 intercommunication setting.
Referring to fig. 1, a first embodiment of the present invention is:
the utility model provides an impedance combined type silencer, includes casing 1, baffle 2, first pipeline 3, second pipeline 4 and blast pipe 9, and casing 1 includes left end lid 11, lateral wall 12 and right-hand member lid 13, and left end lid 11, lateral wall 12 and right-hand member lid 13 enclose into a cavity, are equipped with air inlet and gas outlet on casing 1, and the air inlet sets up on left end lid 11, and the gas outlet setting is on lateral wall 12. Baffle 2 sets up in the cavity and separates the cavity for first cavity 5 and second cavity 6, the volume of second cavity 6 is greater than the volume of first cavity 5, be equipped with sound-absorbing layer 7 on the inner wall of second cavity 6, first pipeline 3 sets up in first cavity 5, the one end and the air inlet intercommunication of first pipeline 3, the other end of first pipeline 3 passes baffle 2 and stretches into in second cavity 6, first pipeline 3 sets up with 6 intercommunications of second cavity, first pipeline 3 passes through the flange with the one end of air inlet intercommunication and fixes on left end lid 11. The second pipeline 4 is arranged in the second cavity 6, one end of the second pipeline 4 is welded on the shell 1 and is connected with the shell 1 in a sealing mode, the other end of the second pipeline 4 penetrates through the partition plate 2 and extends into the first cavity 5, and the second pipeline 4 is communicated with the first cavity 5. The first and second conduits 3 and 4 are each straight conduits.
The second pipeline 4 comprises an inner pipeline 41 and an outer pipeline 42, the outer pipeline 42 is sleeved outside the inner pipeline 41, a sound absorption layer 7 is filled between the inner pipeline 41 and the outer pipeline 42, and a plurality of through holes are respectively arranged on the pipe walls of the inner pipeline 41 and the outer pipeline 42. The air outlet is communicated with the first cavity 5. The partition board 2 is of a hollow structure, and a sound absorption layer 7 is arranged in the partition board 2. The sound absorption layer 7 is made of glass fiber.
An inner shell 8 is arranged in the second cavity 6, the inner shell 8 is of a hollow structure with an opening, a sound absorption layer 7 is filled between the shell 1 and the inner shell 8, and a through hole is formed in the inner shell 8. One end of the exhaust pipe 9 is communicated with the air outlet, and the other end of the exhaust pipe 9 extends into the first cavity 5 and is communicated with the first cavity 5.
The second embodiment of the invention is as follows:
referring to the first embodiment, the impedance hybrid muffler of the present embodiment is different from the first embodiment in that:
the sectional area of one end of the first pipeline 3 communicated with the air inlet is smaller than that of the other end of the first pipeline 3. The cross-sectional area of one end of the second pipeline 4 extending into the first cavity 5 is smaller than that of the other end of the second pipeline 4.
In conclusion, the impedance composite muffler provided by the invention can eliminate low, medium and high frequency noises, and has the advantages of simple structure and good muffling effect.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (5)
1. An impedance composite muffler is characterized by comprising a shell, a partition plate, a first pipeline and a second pipeline, wherein a cavity is arranged in the shell, an air inlet and an air outlet are formed in the shell, the partition plate is arranged in the cavity and divides the cavity into a first cavity and a second cavity, a sound absorption layer is arranged on the inner wall of the second cavity, one end of the first pipeline is communicated with the air inlet, the other end of the first pipeline penetrates through the partition plate and extends into the second cavity, the second pipeline is arranged in the second cavity, one end of the second pipeline is arranged on the shell, the other end of the second pipeline penetrates through the partition plate and extends into the first cavity, a through hole is formed in the pipe wall of the second pipeline, and the air outlet is communicated with the first cavity;
the sectional area of one end of the first pipeline communicated with the air inlet is smaller than that of the other end of the first pipeline;
the sectional area of one end of the second pipeline extending into the first cavity is smaller than that of the other end of the second pipeline;
the sound absorption layer is arranged on the inner wall of the second pipeline, the second pipeline comprises an inner pipeline and an outer pipeline, the outer pipeline is sleeved on the outer side of the inner pipeline, and the sound absorption layer is filled between the inner pipeline and the outer pipeline.
2. The impedance composite muffler of claim 1, wherein the sound absorbing layer is made of fiberglass.
3. The impedance hybrid muffler of claim 1, wherein said housing comprises a left end cap, a side wall and a right end cap enclosing said cavity, said air inlet disposed on said left end cap and said air outlet disposed on said side wall.
4. The impedance composite muffler of claim 1, further comprising an inner shell, wherein the inner shell is a hollow structure with an opening, the inner shell is disposed in the second cavity, a sound absorption layer is filled between the inner shell and the shell, and a through hole is formed in the inner shell.
5. The impedance composite muffler of claim 1, further comprising an exhaust pipe, wherein one end of the exhaust pipe is in communication with the air outlet, and the other end of the exhaust pipe extends into the first cavity and is in communication with the first cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611018359.7A CN106782485B (en) | 2016-11-18 | 2016-11-18 | Impedance composite muffler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611018359.7A CN106782485B (en) | 2016-11-18 | 2016-11-18 | Impedance composite muffler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106782485A CN106782485A (en) | 2017-05-31 |
| CN106782485B true CN106782485B (en) | 2021-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611018359.7A Active CN106782485B (en) | 2016-11-18 | 2016-11-18 | Impedance composite muffler |
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| Country | Link |
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| CN (1) | CN106782485B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112102805B (en) * | 2020-08-28 | 2024-05-14 | 武汉理工大学 | Impedance-adjustable composite muffler and noise elimination system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201461037U (en) * | 2009-08-14 | 2010-05-12 | 诸城市海得威机械有限公司 | Impedance composite exhaust muffler for miniature automobile |
| CN101769189A (en) * | 2009-01-07 | 2010-07-07 | 郑忠才 | Smoke-removing muffler for agricultural automobile |
| CN201818347U (en) * | 2010-07-13 | 2011-05-04 | 宁波市江北保隆消声***制造有限公司 | Automotive impedance composite muffler |
| KR20120008392U (en) * | 2011-05-30 | 2012-12-10 | 현대중공업 주식회사 | Noise reduction type air conditioner duct |
| CN104265415A (en) * | 2014-09-30 | 2015-01-07 | 诸城市海得威机械有限公司 | Impedance composite tractor muffler |
| CN104265413A (en) * | 2014-09-22 | 2015-01-07 | 诸城市海得威机械有限公司 | Impedance complex silencer for tractor |
| CN104265408A (en) * | 2014-09-30 | 2015-01-07 | 诸城市海得威机械有限公司 | Impedance compound muffler for power generating equipment |
| CN204663627U (en) * | 2015-04-02 | 2015-09-23 | 刘玺 | Be applicable to combined impedance silencing apparatus that is middle and high, low frequency noise elimination |
| CN105736097A (en) * | 2016-04-08 | 2016-07-06 | 重庆交通大学 | Diesel engine tail gas recovering and purifying and noise reducing composite device |
| CN105927315A (en) * | 2016-06-16 | 2016-09-07 | 沈阳理工大学 | Impedance compound silencer |
-
2016
- 2016-11-18 CN CN201611018359.7A patent/CN106782485B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769189A (en) * | 2009-01-07 | 2010-07-07 | 郑忠才 | Smoke-removing muffler for agricultural automobile |
| CN201461037U (en) * | 2009-08-14 | 2010-05-12 | 诸城市海得威机械有限公司 | Impedance composite exhaust muffler for miniature automobile |
| CN201818347U (en) * | 2010-07-13 | 2011-05-04 | 宁波市江北保隆消声***制造有限公司 | Automotive impedance composite muffler |
| KR20120008392U (en) * | 2011-05-30 | 2012-12-10 | 현대중공업 주식회사 | Noise reduction type air conditioner duct |
| CN104265413A (en) * | 2014-09-22 | 2015-01-07 | 诸城市海得威机械有限公司 | Impedance complex silencer for tractor |
| CN104265415A (en) * | 2014-09-30 | 2015-01-07 | 诸城市海得威机械有限公司 | Impedance composite tractor muffler |
| CN104265408A (en) * | 2014-09-30 | 2015-01-07 | 诸城市海得威机械有限公司 | Impedance compound muffler for power generating equipment |
| CN204663627U (en) * | 2015-04-02 | 2015-09-23 | 刘玺 | Be applicable to combined impedance silencing apparatus that is middle and high, low frequency noise elimination |
| CN105736097A (en) * | 2016-04-08 | 2016-07-06 | 重庆交通大学 | Diesel engine tail gas recovering and purifying and noise reducing composite device |
| CN105927315A (en) * | 2016-06-16 | 2016-09-07 | 沈阳理工大学 | Impedance compound silencer |
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| Publication number | Publication date |
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| CN106782485A (en) | 2017-05-31 |
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