US3680660A - Multi-louvered roughness silencer - Google Patents
Multi-louvered roughness silencer Download PDFInfo
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- US3680660A US3680660A US58393A US3680660DA US3680660A US 3680660 A US3680660 A US 3680660A US 58393 A US58393 A US 58393A US 3680660D A US3680660D A US 3680660DA US 3680660 A US3680660 A US 3680660A
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- Prior art keywords
- flow tube
- tubes
- chambers
- muffler
- tube
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
Definitions
- the invention accomplishes this by means of expansion chambers arranged in parallel with the gas flow tube that are provided with perforated walls to permit gas flow from the tube to the various chambers.
- FIG. 1 is a longitudinal cross section through a muffler embodying the invention.
- FIG. 2 is a cross section along the line 22 of FIG. 1.
- the mufiler 1 has a housing 3 which has the ends swaged or otherwise reduced in diameter to provide an inlet bushing 5 and an outlet bushing 7.
- the bushingsS and 7 are aligned and preferably offset from the axis of the housing 3, the latter being preferably circular as seen in FIG. 2.
- a straight-through gas flow tube 9 is supported in the bushings 5 and 7 and conducts gas from the exhaust pipe 11 straight through the chamber 10 defined by housing 3 to the tailpipe 13, the pipes 11 and 13 being telescoped over opposite ends of the tube 9
- the shells are preferably spot welded or arctacked to the housing 3 along the line of tangency.
- the halves of the tube 9 and the shells 17 and 19 which face away from their line of tangency with the shell are provided along most of the lengths with perforations that are preferably louvers 21 which arranged to direct the gas in a circular pattern as indicated in FIG 2.
- the flow tube 9 and the surrounding shells divide the interior 10 of the casing 3 into sub-chambers 23, 25 and 27.
- the shells l7 and 19 are preferably spaced slightly from the opposite ends of the housing 3 to provide end chambers 29 and 31 which communicate with the previously mentioned chambers.
- gas flowing through the mufller 1 can pass from the exhaust pipe 11 to tailpipe 13 with a minimum of horsepower loss because of the low backpressure created by the straight-through flow path of tube 9.
- Pressure pulses in the gas as it passes through the tube can expand radially or sideways and pass, in series, into .the chambers 23, 25 and 27 after passing through louvers 21.
- the gas can also expand longitudinally into the end chambers 29 and 31. Since the louver patches are radially aligned and extend over substantially less than all the circumferences of the tube 9 and shells 17 and 19, the non-louver subtended portions of chambers 23, 25 and 27 are partially dead (no flow through) and act in a special way to absorb acoustic energy.
- the muffler l is principally effective on high $2 i ififillwnfi fi s ffi 'hi h 'ilfl lower frequency range giving the deep power sound favored by sports car drivers.
- the mufiler 1 in an exhaust system so that the maximum pressure point or anti-node of a troublesome frequency falls centrally within the perforated region of the tube 9, attenuation of such lower frequency can be achieved to a substantial degree.
- a muffler comprising an imperforate outer housing having an inlet at one end and an outlet at the other end, a perforated straight-through gas flow tube in the housing connecting the inlet and outlet and defining a straight-through gas flow path for the mufiler, said shell defining a chamber around said tube, and a plurality of radially separated perforated secondary tubes surrounding said flow tube and subdividing said chamber into radially separated sub-chambers, said sub-chambers being in radial communication by means of the perforations in the tubes with gas flowing through the flow tube, said secondary tubes being spaced from at least one end of the chamber to define an end chamber, and sub-chambers communicating with said end chamber.
- a muffler comprising an imperforate outer housing having an inlet at one end and an outlet at the other end, a perforated straight-through gas flow tube in the housing connecting the inlet and outlet and defining a straight-through gas flow path for the muffler, said shell defining a chamber around said tube, and a plurality of radially separated perforated secondary tubes surrounding said flow tube and subdividing said chamber into radially separated sub-chambers, said sub-chambers being in radial communication by means of the perforations in the tubes with gas flowing through the flow tube, said inlet and outlet and said flow tube being offset from the center line of the housing and the smaller of said secondary tubes being substantially concentric with the flow tube.
- a mufiler comprising an imperforate outer housing having an inlet at one end and an outlet at the outer end, a perforated straight-through gas flow tube in the housing connecting the inlet and outlet and defining a straight-through gas flow path for the muffler, said shell defining a chamber around said tube, and a plurality of radially separated perforated secondary tubes surrounding said flow tube and subdividing said chamber into radially separated sub-chambers, said subchambers being in radial communication by means of the perforations in the tubes with gas flowing through the flow tube, each of said tubes having a perforate area that extends over substantially less than the entire circumference of the tube.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
A muffler has a plurality of perforated tubes telescoped over a perforated gas flow tube to provide a series of expansion chambers connected in parallel with the gas flow path.
Description
United States Patent DuBois I [54] MULTI-LOUVERED ROUGHNESS SILENCER.
[72] Inventor: Bert DuBols, Brooklyn, Mich.
[73] Assignee: Tenneco Inc., Racine, Wis.
[22] Filed: July 27, 1970 [21] App]. No.: 58,393
[52] US. Cl. ..181/48, 181/55, 181/61, l8l/63 [51] Int. Cl. ..F01n l/08, F01n 7/18 [58] Field of Search ..181/48, 53-55,
[56] References Cited UNITED STATES PATENTS 2,038,309 4/1936 Oldberg ..1s1/s4 [15] 3,680,660 [4 1 Aug. 1, 1972 3,485,319 12/1969 Balluff ..181/54 FOREIGN PATENTS OR APPLICATIONS 17,680 1905 Great Britain ..181/55 822,559 9/1937 France ..181/55 803,452 4/1951 Germany ..181/55 582,946 10/1958 Italy ..181/55 Primary Examiner-Robert S. Ward, Jr. Attorney-Harness, Dickey and Pierce [57] ABSTRACT A muffler has a plurality of perforated tubes telescoped over a perforated gas flow tube to provide a series of expansion chambers connected in parallel with the gas flow path.
5 Claim, 2 Drawing Figures 1 MULTI-LOUVERED ROUGHNESS SILENCER BRIEF SUMMARY OF THE INVENTION It is the purpose of this invention to provide a low backpressure muffler containing silencing structure that provides an acoustic efiect similar to a mass of glass fibers or the like, that is, it attenuates high frequencies and roughness and medium frequencies while allowing the power sound of the lower frequencies to remain audible.
The invention accomplishes this by means of expansion chambers arranged in parallel with the gas flow tube that are provided with perforated walls to permit gas flow from the tube to the various chambers.
DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal cross section through a muffler embodying the invention; and
FIG. 2 is a cross section along the line 22 of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION The mufiler 1 has a housing 3 which has the ends swaged or otherwise reduced in diameter to provide an inlet bushing 5 and an outlet bushing 7. The bushingsS and 7 are aligned and preferably offset from the axis of the housing 3, the latter being preferably circular as seen in FIG. 2. A straight-through gas flow tube 9 is supported in the bushings 5 and 7 and conducts gas from the exhaust pipe 11 straight through the chamber 10 defined by housing 3 to the tailpipe 13, the pipes 11 and 13 being telescoped over opposite ends of the tube 9 Surrounding the flow tube 9 and tangential to each other and to the casing 3 along the line 15 are secondary tubes in the form of inner and outer tubular shells 17 and 19. The shells are preferably spot welded or arctacked to the housing 3 along the line of tangency. The halves of the tube 9 and the shells 17 and 19 which face away from their line of tangency with the shell are provided along most of the lengths with perforations that are preferably louvers 21 which arranged to direct the gas in a circular pattern as indicated in FIG 2. The flow tube 9 and the surrounding shells divide the interior 10 of the casing 3 into sub-chambers 23, 25 and 27. The shells l7 and 19 are preferably spaced slightly from the opposite ends of the housing 3 to provide end chambers 29 and 31 which communicate with the previously mentioned chambers.
In operation, gas flowing through the mufller 1 can pass from the exhaust pipe 11 to tailpipe 13 with a minimum of horsepower loss because of the low backpressure created by the straight-through flow path of tube 9. Pressure pulses in the gas as it passes through the tube can expand radially or sideways and pass, in series, into .the chambers 23, 25 and 27 after passing through louvers 21. The gas can also expand longitudinally into the end chambers 29 and 31. Since the louver patches are radially aligned and extend over substantially less than all the circumferences of the tube 9 and shells 17 and 19, the non-louver subtended portions of chambers 23, 25 and 27 are partially dead (no flow through) and act in a special way to absorb acoustic energy.
The muffler l is principally effective on high $2 i ififillwnfi fi s ffi 'hi h 'ilfl lower frequency range giving the deep power sound favored by sports car drivers. However, by placing the mufiler 1 in an exhaust system so that the maximum pressure point or anti-node of a troublesome frequency falls centrally within the perforated region of the tube 9, attenuation of such lower frequency can be achieved to a substantial degree.
Modifications may be made without departing from the spirit and scope of the invention.
I claim:
1. A muffler comprising an imperforate outer housing having an inlet at one end and an outlet at the other end, a perforated straight-through gas flow tube in the housing connecting the inlet and outlet and defining a straight-through gas flow path for the mufiler, said shell defining a chamber around said tube, and a plurality of radially separated perforated secondary tubes surrounding said flow tube and subdividing said chamber into radially separated sub-chambers, said sub-chambers being in radial communication by means of the perforations in the tubes with gas flowing through the flow tube, said secondary tubes being spaced from at least one end of the chamber to define an end chamber, and sub-chambers communicating with said end chamber.
2. A muffler comprising an imperforate outer housing having an inlet at one end and an outlet at the other end, a perforated straight-through gas flow tube in the housing connecting the inlet and outlet and defining a straight-through gas flow path for the muffler, said shell defining a chamber around said tube, and a plurality of radially separated perforated secondary tubes surrounding said flow tube and subdividing said chamber into radially separated sub-chambers, said sub-chambers being in radial communication by means of the perforations in the tubes with gas flowing through the flow tube, said inlet and outlet and said flow tube being offset from the center line of the housing and the smaller of said secondary tubes being substantially concentric with the flow tube.
3. A mufiler as set forth in claim 2 wherein said secondary tubes are substantially tangent to each other and to the housing.
4. A muffler as set forth in claim 3 wherein the perforate areas in the tubes are substantially aligned radially and extend angularly over substantially less than the entire circumferences of the tubes whereby portions of the sub-chambers are dead.
5. A mufiler comprising an imperforate outer housing having an inlet at one end and an outlet at the outer end, a perforated straight-through gas flow tube in the housing connecting the inlet and outlet and defining a straight-through gas flow path for the muffler, said shell defining a chamber around said tube, and a plurality of radially separated perforated secondary tubes surrounding said flow tube and subdividing said chamber into radially separated sub-chambers, said subchambers being in radial communication by means of the perforations in the tubes with gas flowing through the flow tube, each of said tubes having a perforate area that extends over substantially less than the entire circumference of the tube.
Claims (5)
1. A muffler comprising an imperforate outer housing having an inlet at one end and an outlet at the other end, a perforated straight-through gas flow tube in the housing connecting the inlet and outlet and defining a straight-through gas flow path for the muffler, said shell defining a chamber around said tube, and a plurality of radially separated perforated secondary tubes surrounding said flow tube and subdividing said chamber into radially separated sub-chambers, said sub-chambers being in radial communication by means of the perforations in the tubes with gas flowing through the flow tube, said secondary tubes being spaced from at least one end of the chamber to define an end chamber, and sub-chambers communicating with said end chamber.
2. A muffler comprising an imperforate outer housing having an inlet at one end and an outlet at the other end, a perforated straight-through gas flow tube in the housing connecting the inlet and outlet and defining a straight-through gas flow path for the muffler, said shell defining a chamber around said tube, and a plurality of radially separated perforated secondary tubes surrounding said flow tube and subdividing said chamber into radially separated sub-chambers, said sub-chambers being in radial communication by means of the perforations in the tubes with gas flowing through the flow tube, said inlet and outlet and said flow tube being offset from the center line of the housing and the smaller of said secondary tubes being substantially concentric with the flow tube.
3. A muffler as set forth in claim 2 wherein said secondary tubes are substantially tangent to each other and to the housing.
4. A muffler as set forth in claim 3 wherein the perforate areas in the tubes are substantially aligned radially and extend angularly over substantially less than the entire circumferences of the tubes whereby portions of the sub-chambers are dead.
5. A muffler comprising an imperforate outer housing having an inlet at one end and an outlet at the outer end, a perforated straight-through gas flow tube in the housing connecting the inlet and outlet and defining a straight-through gas flow path for the muffler, said shell defining a chamber around said tube, and a plurality of radially separated perforated secondary tubes surrounding said flow tube and subdividing said chamber into radially separated sub-chambers, said sub-chambers being in radial communication by means of the perforations in the tubes with gas flowing through the flow tube, each of said tubes having a perforate area that extends over substantially less than the entire circumference of the tube.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US5839370A | 1970-07-27 | 1970-07-27 |
Publications (1)
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US3680660A true US3680660A (en) | 1972-08-01 |
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US58393A Expired - Lifetime US3680660A (en) | 1970-07-27 | 1970-07-27 | Multi-louvered roughness silencer |
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Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3765506A (en) * | 1972-11-08 | 1973-10-16 | Tenneco Inc | Sound attenuating muffler |
US6695094B2 (en) * | 2001-02-02 | 2004-02-24 | The Boeing Company | Acoustic muffler for turbine engine |
US20060043236A1 (en) * | 2004-09-02 | 2006-03-02 | Campbell Thomas A | Integrated axially varying engine muffler, and associated methods and systems |
US20060071123A1 (en) * | 2004-09-27 | 2006-04-06 | Nguyen Phuong H | Automatic control systems for aircraft auxiliary power units, and associated methods |
US20060102779A1 (en) * | 2004-10-26 | 2006-05-18 | Campbell Thomas A | Dual flow APU inlet and associated systems and methods |
US20060168968A1 (en) * | 2005-02-03 | 2006-08-03 | Edward Zielinski | Systems and methods for starting aircraft engines |
US20070267540A1 (en) * | 2002-10-22 | 2007-11-22 | Atkey Warren A | Electric-based secondary power system architectures for aircraft |
WO2007134865A1 (en) * | 2006-05-24 | 2007-11-29 | Emcon Technologies Germany (Augsburg) Gmbh | Housing for a component of an exhaust system and such a component |
US20070284178A1 (en) * | 2004-12-10 | 2007-12-13 | U.S.A. As Represented By The Secretary Of The Army | Muffler and related systems |
US20080078863A1 (en) * | 2006-09-25 | 2008-04-03 | The Boeing Company | Thermally compliant APU exhaust duct arrangements and associated systems and methods |
US20090014238A1 (en) * | 2007-07-10 | 2009-01-15 | Huff Ronald G | Muffler |
US20100051379A1 (en) * | 2008-09-02 | 2010-03-04 | Charles Graves | Enhanced Exhaust System |
US20100270103A1 (en) * | 2007-07-10 | 2010-10-28 | Tmg Performance Products, Llc | Exhaust muffler |
US8657227B1 (en) | 2009-09-11 | 2014-02-25 | The Boeing Company | Independent power generation in aircraft |
US8738268B2 (en) | 2011-03-10 | 2014-05-27 | The Boeing Company | Vehicle electrical power management and distribution |
US20170167332A1 (en) * | 2015-12-14 | 2017-06-15 | Secor Limited, D/B/A Awe Tuning | Compact muffler having multiple reactive cavities providing multi-spectrum attenuation for enhanced noise suppression |
US10711670B2 (en) * | 2015-06-17 | 2020-07-14 | Orbital Australia Pty Ltd | Muffler |
US11220949B2 (en) * | 2017-11-08 | 2022-01-11 | Toyota Jidosha Kabushiki Kaisha | Exhaust silencer device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB190517680A (en) * | 1905-09-01 | 1906-02-01 | Henry Thomas Hutton | An Improved Silencer for the Exhaust Gases from Internal Combustion Engines. |
US2038309A (en) * | 1934-07-25 | 1936-04-21 | Oldberg Sidney | Silencer |
FR822559A (en) * | 1936-09-08 | 1938-01-04 | Silent improvements | |
DE803452C (en) * | 1949-11-22 | 1951-04-02 | Eberspaecher J | Silencer for pulsating currents with partially or completely perforated exhaust pipe inside the damper |
US3485319A (en) * | 1967-12-21 | 1969-12-23 | Walker Mfg Co | Exhaust gas converter or muffler tube with staggered louvers |
-
1970
- 1970-07-27 US US58393A patent/US3680660A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB190517680A (en) * | 1905-09-01 | 1906-02-01 | Henry Thomas Hutton | An Improved Silencer for the Exhaust Gases from Internal Combustion Engines. |
US2038309A (en) * | 1934-07-25 | 1936-04-21 | Oldberg Sidney | Silencer |
FR822559A (en) * | 1936-09-08 | 1938-01-04 | Silent improvements | |
DE803452C (en) * | 1949-11-22 | 1951-04-02 | Eberspaecher J | Silencer for pulsating currents with partially or completely perforated exhaust pipe inside the damper |
US3485319A (en) * | 1967-12-21 | 1969-12-23 | Walker Mfg Co | Exhaust gas converter or muffler tube with staggered louvers |
Cited By (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3765506A (en) * | 1972-11-08 | 1973-10-16 | Tenneco Inc | Sound attenuating muffler |
US6695094B2 (en) * | 2001-02-02 | 2004-02-24 | The Boeing Company | Acoustic muffler for turbine engine |
US20070267540A1 (en) * | 2002-10-22 | 2007-11-22 | Atkey Warren A | Electric-based secondary power system architectures for aircraft |
US20060043236A1 (en) * | 2004-09-02 | 2006-03-02 | Campbell Thomas A | Integrated axially varying engine muffler, and associated methods and systems |
US7267297B2 (en) | 2004-09-02 | 2007-09-11 | The Boeing Company | Integrated axially varying engine muffler, and associated methods and systems |
US7364116B2 (en) | 2004-09-27 | 2008-04-29 | The Boeing Company | Automatic control systems for aircraft auxiliary power units, and associated methods |
US20060071123A1 (en) * | 2004-09-27 | 2006-04-06 | Nguyen Phuong H | Automatic control systems for aircraft auxiliary power units, and associated methods |
US8061650B2 (en) | 2004-09-27 | 2011-11-22 | The Boeing Company | Automatic control systems for aircraft auxiliary power units, and associated methods |
US20110127372A1 (en) * | 2004-09-27 | 2011-06-02 | The Boeing Company | Automatic control systems for aircraft auxiliary power units, and associated methods |
US7891605B2 (en) | 2004-09-27 | 2011-02-22 | The Boeing Company | Automatic control systems for aircraft auxiliary power units, and associated methods |
US20090037036A1 (en) * | 2004-09-27 | 2009-02-05 | The Boeing Company | Automatic Control Systems for Aircraft Auxiliary Power Units, and Associated Methods |
US7611093B2 (en) | 2004-10-26 | 2009-11-03 | The Boeing Company | Dual flow APU inlet and associated systems and methods |
US7344107B2 (en) | 2004-10-26 | 2008-03-18 | The Boeing Company | Dual flow APU inlet and associated systems and methods |
US20080179466A1 (en) * | 2004-10-26 | 2008-07-31 | The Boeing Company | Dual Flow APU Inlet and Associated Systems and Methods |
US20060102779A1 (en) * | 2004-10-26 | 2006-05-18 | Campbell Thomas A | Dual flow APU inlet and associated systems and methods |
US7854297B2 (en) * | 2004-12-10 | 2010-12-21 | The United States Of America As Represented By The Secretary Of The Army | Muffler and related systems |
US20070284178A1 (en) * | 2004-12-10 | 2007-12-13 | U.S.A. As Represented By The Secretary Of The Army | Muffler and related systems |
US7513119B2 (en) | 2005-02-03 | 2009-04-07 | The Boeing Company | Systems and methods for starting aircraft engines |
US20060168968A1 (en) * | 2005-02-03 | 2006-08-03 | Edward Zielinski | Systems and methods for starting aircraft engines |
US20100012421A1 (en) * | 2006-05-24 | 2010-01-21 | Emcon Technologies Germany (Augsburg) Gmbh | Housing For A Component of An Exhaust System, and Such a Component |
WO2007134865A1 (en) * | 2006-05-24 | 2007-11-29 | Emcon Technologies Germany (Augsburg) Gmbh | Housing for a component of an exhaust system and such a component |
US20080078863A1 (en) * | 2006-09-25 | 2008-04-03 | The Boeing Company | Thermally compliant APU exhaust duct arrangements and associated systems and methods |
US7765784B2 (en) | 2006-09-25 | 2010-08-03 | The Boeing Company | Thermally compliant APU exhaust duct arrangements and associated systems and methods |
US7942239B2 (en) | 2007-07-10 | 2011-05-17 | Tmg Performance Products, Llc | Exhaust muffler |
US20100270103A1 (en) * | 2007-07-10 | 2010-10-28 | Tmg Performance Products, Llc | Exhaust muffler |
US7798286B2 (en) * | 2007-07-10 | 2010-09-21 | Tmg Performance Products, Llc | Exhaust muffler having a horizontally extending sound attenuation chamber |
US20090014237A1 (en) * | 2007-07-10 | 2009-01-15 | Keith Skowronski | Muffler |
US20090014238A1 (en) * | 2007-07-10 | 2009-01-15 | Huff Ronald G | Muffler |
US20100051379A1 (en) * | 2008-09-02 | 2010-03-04 | Charles Graves | Enhanced Exhaust System |
US8657227B1 (en) | 2009-09-11 | 2014-02-25 | The Boeing Company | Independent power generation in aircraft |
US8950703B2 (en) | 2009-09-11 | 2015-02-10 | The Boeing Company | Independent power generation in aircraft |
US8738268B2 (en) | 2011-03-10 | 2014-05-27 | The Boeing Company | Vehicle electrical power management and distribution |
US10711670B2 (en) * | 2015-06-17 | 2020-07-14 | Orbital Australia Pty Ltd | Muffler |
US20170167332A1 (en) * | 2015-12-14 | 2017-06-15 | Secor Limited, D/B/A Awe Tuning | Compact muffler having multiple reactive cavities providing multi-spectrum attenuation for enhanced noise suppression |
US10161275B2 (en) * | 2015-12-14 | 2018-12-25 | Secor Limited | Compact muffler having multiple reactive cavities providing multi-spectrum attenuation for enhanced noise suppression |
US11220949B2 (en) * | 2017-11-08 | 2022-01-11 | Toyota Jidosha Kabushiki Kaisha | Exhaust silencer device |
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