CN103850769A - Automobile muffler for controlling airflow regenerated noise - Google Patents
Automobile muffler for controlling airflow regenerated noise Download PDFInfo
- Publication number
- CN103850769A CN103850769A CN201410089642.3A CN201410089642A CN103850769A CN 103850769 A CN103850769 A CN 103850769A CN 201410089642 A CN201410089642 A CN 201410089642A CN 103850769 A CN103850769 A CN 103850769A
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- outlet pipe
- expansion chamber
- steam outlet
- housing
- suction tude
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Abstract
The invention relates to an automobile muffler for controlling airflow regenerated noise. A first clapboard and a second clapboard axially vertical to a shell divide the interior of the shell into a first expansion cavity, a second expansion cavity and a dissipative muffler chamber; and an air inlet pipe, a transition pipe and an air outlet pipe are axially parallel to the shell and are arranged at intervals mutually. The air inlet pipe penetrates through a front end cover, the first clapboard and the second clapboard so as to be stretched into the second expansion cavity; one end of the air outlet pipe is located in the first expansion cavity; the air outlet pipe penetrates through the first clapboard, the second clapboard and a rear end cover and gets out; and one end of the transition pipe is located in the first expansion cavity, and penetrates through the first clapboard and the second clapboard so as to be stretched into the second expansion cavity. Micropores are formed in pipe walls of the air outlet pipe and the transition pipe in the dissipative muffler chamber; and the air outlet pipe in the second expansion cavity. An outlet end of the air inlet pipe is of an expansion port structure. Acoustic absorption cotton covers the shell, inner walls of the front end cover and the rear end cover, and the last section of the air outlet pipe. Airflow entering into the muffler is compressed and expanded for multiple times through three pipes and three chambers, and is in smooth transition, and the speed is gradually reduced, so that the airflow regenerated noise is obviously reduced.
Description
Technical field
The present invention relates to automotive silencing technology, be specifically related to a kind of automotive muffler of controlling reproduced air-flow noise.
Background technique
Along with the raising to environmental requirement, the restriction increasingly stringent to automobile noise in the environmental legislation of countries in the world.In order to adapt to domestic and international automobile market with keen competition and social sustainable development demand, the design producer who requires automobile, on the basis of the not excessive power character that affects motor, Economy, reduces the noise level of automobile as far as possible.Along with internal-combustion engine develops to speed up, automobile noise problem has become the major issue of the solution of having to.Exhaust sound is topmost noise source in vehicle noise.
Automotive muffler is the air exhaust muffler device that Hyundai Motor extensively adopts, and is the simple and effective means that reduce engine noise.The quality of the actual acoustic attenuation performance of silencing apparatus is directly connected to the car load noise size in when work, concerns the noise level of car load.
Affecting the most important factor of exhaust sound is engine speed and load, and its reason is that rotating speed increase increases airspeed in exhaust duct.High velocity air produces regenerated noise main cause two kinds.One is that inner-walls of duct or other members produce vibration and radiated noise under air-flow percussion, and this kind is construct noise.Another kind is during due to complicated structure by silencing apparatus shell of the exhaust airstream of high engine speeds, can run into the situations such as the abrupt change of cross-section, perforated plate, perforated pipe, elbow, and strong generation turbulent motion is caused noise by high velocity air, and this kind is turbulence noise.Along with the increase of airspeed, also increase at the inner regenerated noise producing of silencing apparatus.
Regenerated noise has an immense impact on to the performance of silencing apparatus, and the actual soundproof effect of silencing apparatus is sharply declined, and loses soundproof effect when regenerated noise can make silencing apparatus greatly to a certain extent, when serious, even can make silencing apparatus become noise amplifier.
Along with power of vehicle increases, internal-combustion engine develops to speed up, the reproduced air-flow noise problem of silencing apparatus becomes the key factor that affects Sound Elimination Performance of Mufflers.Therefore, the high-performing car silencing apparatus of reproduced air-flow noise is controlled in development, pollutes and has great importance for reduction automobile noise, minimizing urban environment noise.
Summary of the invention
The object of the invention is to design a kind of automotive muffler of controlling reproduced air-flow noise, silencing apparatus inner chamber is divided into three chambers, suction tude, steam outlet pipe and transition tube space arrange, discharges after air-flow is slowed down in compand repeatedly, effectively reduces reproduced air-flow noise.
A kind of automotive muffler of controlling reproduced air-flow noise of the present invention's design, comprises housing, suction tude and steam outlet pipe, and described suction tude enters housing, the inlet end that the import of suction tude is this silencing apparatus through housing front cover; The rear end cover of described steam outlet pipe by housing, pass silencing apparatus, the exhaust end that the outlet of steam outlet pipe is this silencing apparatus; In housing, be provided with housing shaft to vertical the first dividing plate and second partition, enclosure interior is isolated into the first expansion chamber, dissipative muffler chamber and three chambers of the second expansion chamber successively; Described suction tude and steam outlet pipe and housing shaft be to be arrangeding in parallel, also have transition tube also parallel with suction tude, steam outlet pipe, and space is arranged in housing.Described suction tude, through after the front cover of housing, through first, second dividing plate, stretches into the second expansion chamber successively, and the outlet end of suction tude is positioned at the second expansion chamber; Described steam outlet pipe one end is positioned at the first expansion chamber, and steam outlet pipe is successively through first and second dividing plate, then through the rear end cover of housing, pass silencing apparatus; One end of transition tube is positioned at the first expansion chamber, stretches into the second expansion chamber successively through after first and second dividing plate, and the other end of transition tube is positioned at the second expansion chamber.The part that described steam outlet pipe and transition tube are positioned at resistance noise reduction chamber is provided with micropore on tube wall; The part that described steam outlet pipe is positioned at the second expansion chamber is provided with micropore on tube wall.
The outlet end of described suction tude is extension mouth structure.Described extension mouth structure is round speaker mouth structure or oval extension mouth structure or rectangle extension mouth structure.And tube wall bending place is that fillet seamlessly transits.
For control structure noise, described suppressor case inwall, front cover and rear end cover inwall are all covered with the acoustical cotton of thick 10mm～30mm; The tube wall that described steam outlet pipe is positioned at the second expansion chamber is covered with the acoustical cotton of thick 10mm～30mm outward.
Described the first expansion chamber, dissipative muffler chamber and the axial length of the second expansion chamber are compared, the axial length of the second expansion chamber is greater than the axial length of the first expansion chamber, also be greater than the axial length of resistance noise reduction chamber, the axial length of the first expansion chamber is greater than the axial length of resistance noise reduction chamber.The ratio of the axial length of described the first expansion chamber, dissipative muffler chamber and the second expansion chamber is (2～4) ︰ (1～3) ︰ (4～6).
Micropore size on the tube wall of described transition tube and steam outlet pipe is 2～5mm.
Described steam outlet pipe and transition tube are positioned at the part of resistance noise reduction chamber, and on tube wall, percent opening is 15～20%; Described steam outlet pipe is positioned at the part of the second expansion chamber, and on tube wall, percent opening is 15～20%.The caliber of described suction tude, transition tube and steam outlet pipe is identical.
When automotive muffler work of the present invention, air-flow enters suction tude and is retracted, and discharges at the second expansion chamber intramedullary expansion from suction tude outlet end, entering transition tube shrinks again, enter the first expansion chamber through transition tube and again expand, enter in steam outlet pipe and be retracted again, discharge this silencing apparatus from steam outlet pipe.Because being positioned on the part tube wall of resistance noise reduction chamber, described transition tube has micropore, enter the compressed air stream in transition tube, can the micropore from its tube wall entering resistance noise reduction chamber expands, air-flow in resistance noise reduction chamber can enter steam outlet pipe through the micropore of steam outlet pipe tube wall, directly discharge or enter the second expansion chamber, air-flow in resistance noise reduction chamber also can return to transition tube through the micropore of transition tube wall, then enters the first expansion chamber or the second expansion chamber.Air-flow in the second expansion chamber, except entering transition tube, also can enter steam outlet pipe through the micropore of steam outlet pipe tube wall, directly discharges, or returns to the first expansion chamber through steam outlet pipe, then or enter resistance noise reduction chamber through the micropore of steam outlet pipe tube wall.The speed of the expansion of this silencing apparatus by repeatedly, contraction, air-flow reduces greatly, simultaneously by the aperture of pipeline and the absorption of the sound-absorbing material of inwall to high frequency radiation noise in silencing apparatus, thereby reproduced air-flow noise is reduced widely.
Compared with prior art, the automotive muffler of control reproduced air-flow noise of the present invention has the following advantages: the air-flow that 1, enters this silencing apparatus repeatedly compresses and expands through suction tude, transition tube and steam outlet pipe and three chambers arranged side by side, air-flow is transition more smoothly, exhaust velocity progressively reduces, and has reduced significantly reproduced air-flow noise; 2, suppressor case inwall, front cover and rear end cover inwall and steam outlet pipe rear-most end part are all covered with certain thickness acoustical cotton, control silencing apparatus Surface Radiation Noise, reduce construct noise; 3, the outlet of suction tude in the second expansion chamber is expansion bell-mouth structure of air, and tube wall takes round-corner transition, and exhaust airstream is more smoothly expanded reduction of speed, reduces reproduced air-flow noise; 4, simple in structure, easy to process, noise reduction is obvious, is applicable to the car combustion engine of various models.
Accompanying drawing explanation
Fig. 1 is the automotive muffler example structure schematic diagram of this control reproduced air-flow noise.
Number in the figure is:
1, the first expansion chamber, 2, suction tude, 21, suction tude outlet end, 3, housing, 4, the second expansion control chamber, 5, rear end cover, 6, steam outlet pipe, 7, transition tube, 8, second partition, 9, resistance noise reduction chamber, 10, micropore, 11, the first dividing plate, acoustical cotton, 13, front cover
In figure, arrow represents air-flow principal direction.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details:
Referring to Fig. 1, in the automotive muffler housing 3 of this control reproduced air-flow noise, be provided with and housing 3 axial vertical the first dividing plate 11 and second partition 8, housing 3 inside are isolated into the first expansion chamber 1, dissipative muffler chamber 9 and 4 three chambers of the second expansion chamber successively; The ratio of the axial length of this example the first expansion chamber 1, dissipative muffler chamber 9 and the second expansion chamber 4 is 3 ︰ 2 ︰ 5.
Described suction tude 2, transition tube 7 and steam outlet pipe 6 are arranged in housing 3 with housing 3 parallel to an axiss space.This routine suction tude 2, transition tube 7 are identical with steam outlet pipe 6 calibers.The import of described suction tude 2 is the inlet end of this silencing apparatus; Described suction tude 2 is through after the front cover 13 of housing 3, through the first dividing plate 11, second partition 8, stretch into the second expansion chamber 4 successively, the outlet end 21 of this routine suction tude 2 is round speaker mouth structure, tube wall bending place is that fillet seamlessly transits, and is positioned at the second expansion chamber 4.The outlet of described steam outlet pipe 6 is the exhaust end of this silencing apparatus; The entrance point of described steam outlet pipe 6 is positioned at the first expansion chamber 1, and steam outlet pipe 6 is successively through the first dividing plate 11 and second partition 8, then through the rear end cover 5 of housing 3, pass silencing apparatus; One end of transition tube 7 is positioned at the first expansion chamber 7, through the first dividing plate 11, second partition 8, stretches into the second expansion chamber 4 successively, and the other end of transition tube 7 is positioned at the second expansion chamber 4.The part that described steam outlet pipe 6 and transition tube 7 are positioned at resistance noise reduction chamber 9 is provided with the micropore 10 that aperture is 3mm on tube wall, and percent opening is 20%; The part that this routine steam outlet pipe 6 is positioned at the second expansion chamber 4 is provided with the micropore 10 that aperture is 3mm on tube wall, and percent opening is 20%.Be covered with the acoustical cotton 12 of thick 20mm at the inwall of suppressor case 3, front cover 13 and rear end cover 5, steam outlet pipe 6 is positioned at the acoustical cotton 12 that is also covered with thick 20mm on the tube wall of part of the second expansion chamber 4.
Contrast test, the car combustion engine of employing equal-wattage, installs the automotive muffler of the present embodiment and common silencing apparatus is installed, noise reduction reaches 1dB(A) more than.Noise reduction obviously improves.
Above-described embodiment, is only the specific case that object of the present invention, technological scheme and beneficial effect are further described, and the present invention is not defined in this.All any modifications of making, be equal to replacement, improvement etc., within being all included in protection scope of the present invention within scope of disclosure of the present invention.
Claims (10)
1. control the automotive muffler of reproduced air-flow noise for one kind, comprise housing (3), suction tude (2) and steam outlet pipe (6), described suction tude (2) through the front cover (13) of housing (3), enter housing (3), the inlet end that the import of suction tude (3) is this silencing apparatus; The rear end cover (5) of described steam outlet pipe (6) by housing (3), pass silencing apparatus, the exhaust end that the outlet of steam outlet pipe (6) is this silencing apparatus; It is characterized in that:
In described housing (3), be provided with and housing (3) axial vertical the first dividing plate (11) and second partition (8), housing (3) inside is isolated into the first expansion chamber (1), dissipative muffler chamber (9) and (4) three chambers of the second expansion chamber successively; Described suction tude (2) and steam outlet pipe (6) and housing (3) parallel to an axis setting, also have transition tube (7) also parallel with suction tude (2), steam outlet pipe (6), and space is arranged in housing (3); Described suction tude (2), through after housing (3) front cover (13), through the first dividing plate (11) and second partition (8), stretches into the second expansion chamber (4) successively, and the outlet end of suction tude (2) is positioned at the second expansion chamber (4); Described steam outlet pipe (6) one end is positioned at the first expansion chamber (1), and steam outlet pipe (6) passes the first dividing plate (11) and second partition (8) successively, then passes the rear end cover (5) of housing (3); One end of transition tube (7) is positioned at the first expansion chamber (1), and through stretching into the second expansion chamber (4) after the first dividing plate (11) and second partition (8), the other end of transition tube (7) is positioned at the second expansion chamber (4) successively; The part that described steam outlet pipe (6) and transition tube (7) are positioned at resistance noise reduction chamber (9) is provided with micropore (10) on tube wall; The part that described steam outlet pipe (6) is positioned at the second expansion chamber (4) is provided with micropore (10) on tube wall.
2. the automotive muffler of control reproduced air-flow noise according to claim 1, is characterized in that:
The outlet end (21) of described suction tude (2) is extension mouth structure.
3. the automotive muffler of control reproduced air-flow noise according to claim 2, is characterized in that:
The extension mouth structure of the outlet end (21) of described suction tude (2) is round speaker mouth structure or oval extension mouth structure or rectangle extension mouth structure.
4. the automotive muffler of control reproduced air-flow noise according to claim 3, is characterized in that:
The outlet end tube wall bending place of described suction tude (2) is that fillet seamlessly transits.
5. according to the automotive muffler of the control reproduced air-flow noise described in any one in claim 1 to 4, it is characterized in that:
Described suppressor case (3), front cover (13) and rear end cover (5) inwall are all covered with the acoustical cotton (12) of thick 10mm～30mm; (6 tube walls that are positioned at the second expansion chamber (4) are covered with the acoustical cotton (12) of thick 10mm～30mm outward to described steam outlet pipe.
6. according to the automotive muffler of the control reproduced air-flow noise described in any one in claim 1 to 4, it is characterized in that:
The axial length of described the second expansion chamber (4) is greater than the axial length of the first expansion chamber (1), is also greater than the axial length of resistance noise reduction chamber (9), and the axial length of the first expansion chamber (1) is greater than the axial length of resistance noise reduction chamber (9).
7. the automotive muffler of control reproduced air-flow noise according to claim 6, is characterized in that:
The ratio of the axial length of described the first expansion chamber (1), dissipative muffler chamber (9) and the second expansion chamber (4) is (2～4) ︰ (1～3) ︰ (4～6).
8. according to the automotive muffler of the control reproduced air-flow noise described in any one in claim 1 to 4, it is characterized in that:
Micropore (10) aperture on the tube wall of described transition tube (7) and steam outlet pipe (6) is 2～5mm.
9. according to the automotive muffler of the control reproduced air-flow noise described in any one in claim 1 to 4, it is characterized in that:
Described steam outlet pipe (6) and transition tube (7) are positioned at the part of resistance noise reduction chamber (9), and on tube wall, percent opening is 15～20%; Described steam outlet pipe (6) is positioned at the part of the second expansion chamber (4), and on tube wall, percent opening is 15～20%.
10. according to the automotive muffler of the control reproduced air-flow noise described in any one in claim 1 to 4, it is characterized in that:
Described suction tude (2), transition tube (7) are identical with the caliber of steam outlet pipe (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410089642.3A CN103850769B (en) | 2014-03-12 | 2014-03-12 | A kind of automotive muffler controlling reproduced air-flow noise |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410089642.3A CN103850769B (en) | 2014-03-12 | 2014-03-12 | A kind of automotive muffler controlling reproduced air-flow noise |
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| Publication Number | Publication Date |
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| CN103850769A true CN103850769A (en) | 2014-06-11 |
| CN103850769B CN103850769B (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410089642.3A Active CN103850769B (en) | 2014-03-12 | 2014-03-12 | A kind of automotive muffler controlling reproduced air-flow noise |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104594977A (en) * | 2015-01-29 | 2015-05-06 | 合肥汇凌汽车零部件有限公司 | Silencer for mini-truck internal combustion engine |
| CN106014713A (en) * | 2016-05-25 | 2016-10-12 | 东南大学 | Special intake-exhaust system for JH600 engine of FSAE racing car |
| CN110030061A (en) * | 2019-05-15 | 2019-07-19 | 湖南农业大学 | A kind of racing car exhaust muffling device |
| CN111812204A (en) * | 2020-09-14 | 2020-10-23 | 恒大新能源汽车投资控股集团有限公司 | Sound insulation performance testing device and method for vehicle sound insulation material and electronic equipment |
| CN112049710A (en) * | 2019-06-06 | 2020-12-08 | 卡特彼勒公司 | Exhaust muffler device |
| CN112879142A (en) * | 2021-03-16 | 2021-06-01 | 桂林电子科技大学 | Intelligent noise reduction control system for automobile |
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| CN202209198U (en) * | 2011-08-30 | 2012-05-02 | 重庆市北碚区枫火机械制造有限公司 | Silencer with built-in air inlet tube |
| CN202544980U (en) * | 2012-04-12 | 2012-11-21 | 山东大学 | Reactive muffler for engineering machine |
| US8636103B1 (en) * | 2012-08-10 | 2014-01-28 | Hyundai Motor Company | Muffler for vehicle |
| CN203730103U (en) * | 2014-03-12 | 2014-07-23 | 东风柳州汽车有限公司 | Automobile muffler capable of controlling flow regenerated noise |
-
2014
- 2014-03-12 CN CN201410089642.3A patent/CN103850769B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202209198U (en) * | 2011-08-30 | 2012-05-02 | 重庆市北碚区枫火机械制造有限公司 | Silencer with built-in air inlet tube |
| CN202544980U (en) * | 2012-04-12 | 2012-11-21 | 山东大学 | Reactive muffler for engineering machine |
| US8636103B1 (en) * | 2012-08-10 | 2014-01-28 | Hyundai Motor Company | Muffler for vehicle |
| CN203730103U (en) * | 2014-03-12 | 2014-07-23 | 东风柳州汽车有限公司 | Automobile muffler capable of controlling flow regenerated noise |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104594977A (en) * | 2015-01-29 | 2015-05-06 | 合肥汇凌汽车零部件有限公司 | Silencer for mini-truck internal combustion engine |
| CN106014713A (en) * | 2016-05-25 | 2016-10-12 | 东南大学 | Special intake-exhaust system for JH600 engine of FSAE racing car |
| CN106014713B (en) * | 2016-05-25 | 2018-10-30 | 东南大学 | A kind of special air inlet system and exhaust system of FSAE racing cars JH600 engines |
| CN110030061A (en) * | 2019-05-15 | 2019-07-19 | 湖南农业大学 | A kind of racing car exhaust muffling device |
| CN112049710A (en) * | 2019-06-06 | 2020-12-08 | 卡特彼勒公司 | Exhaust muffler device |
| CN111812204A (en) * | 2020-09-14 | 2020-10-23 | 恒大新能源汽车投资控股集团有限公司 | Sound insulation performance testing device and method for vehicle sound insulation material and electronic equipment |
| CN112879142A (en) * | 2021-03-16 | 2021-06-01 | 桂林电子科技大学 | Intelligent noise reduction control system for automobile |
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| CN103850769B (en) | 2016-03-02 |
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