WO2012048314A4 - Sound attenuation device and method for a combustion engine - Google Patents

Sound attenuation device and method for a combustion engine Download PDF

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Publication number
WO2012048314A4
WO2012048314A4 PCT/US2011/055505 US2011055505W WO2012048314A4 WO 2012048314 A4 WO2012048314 A4 WO 2012048314A4 US 2011055505 W US2011055505 W US 2011055505W WO 2012048314 A4 WO2012048314 A4 WO 2012048314A4
Authority
WO
WIPO (PCT)
Prior art keywords
passages
exhaust gases
cross sectional
tubular conduit
area
Prior art date
Application number
PCT/US2011/055505
Other languages
French (fr)
Other versions
WO2012048314A1 (en
Inventor
James M. Cleeves
Daniel L. Flowers
Michael Hawkes
Original Assignee
Pinnacle Engines, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pinnacle Engines, Inc. filed Critical Pinnacle Engines, Inc.
Priority to CN201180059311.XA priority Critical patent/CN103403308B/en
Priority to US13/271,096 priority patent/US20120090298A1/en
Publication of WO2012048314A1 publication Critical patent/WO2012048314A1/en
Publication of WO2012048314A4 publication Critical patent/WO2012048314A4/en

Links

Classifications

    • 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
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • 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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • 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
    • F01N2230/00—Combination of silencers and other devices
    • F01N2230/04—Catalytic converters
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/14—Plurality of outlet tubes, e.g. in parallel or with different length

Abstract

System comprising a tubular conduit (402) for conducting exhaust gas from an exhaust gas source. A plurality of passages (404) are positioned within a section of said tubular conduit (402), each of the plurality of passages (404) having different passage lengths and a passage cross sectional flow areas such that an approximately equal flow rate is created. Downstream of the plurality of passages (404) follows a collector chamber (414) having a sufficiently large volume to allow for approximately equal pressure across an exit face of the plurality of passages (404). This way equal amounts of sound energy from each side of passages (404) arrive at the collector (414) and interference effects can take place with equal amplitudes which creates efficient sound attenuation. A corresponding method is also disclosed.

Claims

AMENDED CLAIMS received by the International Bureau on 02 APR 2012 (02.04.2012) CLAIMS What is claimed is:
1. A system comprising:
a tubular conduit for conducting exhaust gases from an exhaust gas source, the tubular conduit comprising a conduit cross sectional flow area approximately perpendicular to a direction of exhaust gas flow within the tubular conduit;
a plurality of passages positioned within a section of the tubular conduit, each of the plurality of passages having a passage length and a passage cross sectional flow area and at least some of the plurality of passages having different passage lengths and different passage cross-sectional flow areas, the passage length and passage cross sectional area of each of the plurality of passages being paired to create an approximately equal flow rate for exhaust gases flowing through each of the plurality of passages; and
a collector chamber positioned downstream of the plurality of passages to receive the exhaust gases exiting the plurality of passages, the collector chamber having a sufficiently large collector chamber volume such that the exhaust gases within the collector volume present an approximately equivalent pressure across an exit face of each of the plurality of passages.
2. A system comprising
a tubular conduit for conducting exhaust gases from an exhaust gas source, the tubular conduit comprising a conduit cross sectional flow area approximately perpendicular to a direction of exhaust gas flow within the tubular conduit;
a plurality of passages positioned within a section of the tubular conduit, each of the plurality of passages having a passage length and a passage cross sectional flow area, the passage length and passage cross sectional area of each of the plurality of passages being paired to create an approximately equal flow rate across the tubular conduit for exhaust gases flowing through each of the plurality of passages;
a collector chamber positioned downstream of the plurality of passages to receive the exhaust gases exiting the plurality of passages, the collector chamber having a sufficiently large collector chamber volume such that the exhaust gases within the collector volume present an approximately equivalent pressure across an exit face of each of the plurality of passages; and
a plurality of second passages positioned within a second section of the tubular conduit downstream of the collector chamber, each of the plurality of second passages having a second passage length and a second passage cross sectional flow area, the second passage length and second passage cross sectional area of each of the plurality of second passages being paired to create a second approximately equal flow rate across the tubular conduit for exhaust gases flowing through each the second plurality of passages.
3. A system as in any of claims 1 to 2, wherein at least part of an interior surface area of one or more of the plurality of passages comprises a coating comprising a catalyst material.
4. A system comprising:
a tubular conduit for conducting exhaust gases from an exhaust gas source, the tubular conduit comprising a conduit cross sectional flow area approximately perpendicular to a direction of exhaust gas flow within the tubular conduit;
a plurality of passages positioned within a section of the tubular conduit, each of the plurality of passages having a passage length and a passage cross sectional flow area, the passage length and passage cross sectional area of each of the plurality of passages being paired to create an approximately equal flow rate across the tubular conduit for exhaust gases flowing through each of the plurality of passages, at least part of an interior surface area of one or more of the plurality of passages comprising a coating comprising a catalyst material; a collector chamber positioned downstream of the plurality of passages to receive the exhaust gases exiting the plurality of passages, the collector chamber having a sufficiently large collector chamber volume such that the exhaust gases within the collector volume present an approximately equivalent pressure across an exit face of each of the plurality of passages.
5. A system as in any of claims 3 to 4, wherein the catalyst coating catalyzes at least one reaction that converts at least one combustion by-product present in the exhaust gases to at least one target compound.
6. A system as in any of claims 1 to 5, wherein the at least part of an interior surface area of one or more of the plurality of passages comprises a surface roughening treatment that provides increased surface area relative to an untreated surface.
7. A system as in any of claims 1 to 6, wherein the plurality of passages comprise a piece of sheet metal rolled to fit within the conduit cross sectional flow area, the piece of sheet metal comprising a plurality of corrugations of differing lengths that form the plurality of passages when the piece of sheet metal is rolled to fit within the conduit cross sectional flow area.
8. A system as in claim 7, wherein the piece of sheet metal has an approximately triangular shape that comprises a first edge, a second edge, and a third edge, wherein an axis of each the plurality of corrugations is aligned approximately parallel to the first edge, and wherein the piece of sheet metal is rolled along a rolling axis that is at least approximately perpendicular to the first edge.
9. A method comprising:
conducting exhaust gases from an exhaust gas source through a tubular conduit comprising a conduit cross sectional flow area approximately perpendicular to a direction of exhaust gas flow within the tubular conduit;
causing the exhaust gases to flow through a plurality of passages positioned within a section of the tubular conduit, each of the plurality of passages having a passage length and a passage cross sectional flow area and at least some of the plurality of passages having different passage lengths and different passage cross-sectional flow areas, the passage length and passage cross sectional area of each of the plurality of passages being paired to create an approximately equal flow rate for exhaust gases flowing through each of the plurality of passages; and
receiving the exhaust gases in a collector chamber positioned downstream of the plurality of passages, the collector chamber having a sufficiently large collector chamber volume such that the exhaust gases within the collector volume present an approximately equivalent pressure across an exit face of each of the plurality of passages.
10. A method comprising:
conducting exhaust gases from an exhaust gas source through a tubular conduit comprising a conduit cross sectional flow area approximately perpendicular to a direction of exhaust gas flow within the tubular conduit;
causing the exhaust gases to flow through a plurality of passages positioned within a section of the tubular conduit, each of the plurality of passages having a passage length and a passage cross sectional flow area, the passage length and passage cross sectional area of each of the plurality of passages being paired to create an approximately equal flow per unit cross section area for the exhaust gases flowing through each of the plurality of passages; and receiving the exhaust gases in a collector chamber positioned downstream of the plurality of passages, the collector chamber having a sufficiently large collector chamber volume such that the exhaust gases within the collector volume present an approximately equivalent pressure across an exit face of each of the plurality of passages; and
causing the exhaust gases to flow through a plurality of second passages positioned within a second section of the tubular conduit downstream of the collector chamber, each of the plurality of second passages having a second passage length and a second passage cross sectional flow area, the second passage length and second passage cross sectional area of each of the plurality of second passages being paired to create a second approximately equal flow rate across the exit of the plurality of passages for exhaust gases flowing through the tubular conduit.
1 1. A method as in any of claims 9 to 10, further comprising catalyzing a reaction that converts at least one combustion by-product present in the exhaust gases to at least one target compound, the catalyzing comprising contacting the exhaust gases with a catalyst material at least partly coating an interior surface area of one or more of the plurality of passages.
12. A method comprising:
conducting exhaust gases from an exhaust gas source through a tubular conduit comprising a conduit cross sectional flow area approximately perpendicular to a direction of exhaust gas flow within the tubular conduit;
causing the exhaust gases to flow through a plurality of passages positioned within a section of the tubular conduit, each of the plurality of passages having a passage length and a passage cross sectional flow area, the passage length and passage cross sectional area of each of the plurality of passages being paired to create an approximately equal flow per unit cross section area for the exhaust gases flowing through each of the plurality of passages;
comprising catalyzing a reaction that converts at least one combustion by-product present in the exhaust gases to at least one target compound, the catalyzing comprising contacting the exhaust gases with a catalyst material at least partly coating an interior surface area of one or more of the plurality of passages; and
receiving the exhaust gases in a collector chamber positioned downstream of the plurality of passages, the collector chamber having a sufficiently large collector chamber volume such that the exhaust gases within the collector volume present an approximately equivalent pressure across an exit face of each of the plurality of passages.
13. A method as in any of claims 1 1 to 12, wherein the at least part of an interior surface area of one or more of the plurality of passages comprises a surface roughening treatment that provides increased surface area relative to an untreated surface.
14. A method as in any of claims 9 to 13, wherein the plurality of passages comprise a piece of sheet metal rolled to fit within the conduit cross sectional flow area, the piece of sheet metal comprising a plurality of corrugations of differing lengths that form the plurality of passages when the piece of sheet metal is rolled to fit within the conduit cross sectional flow area.
15. A method as in claim 14, wherein the piece of sheet metal has an approximately triangular shape that comprises a first edge, a second edge, and a third edge, wherein an axis of each the plurality of corrugations is aligned approximately parallel to the first edge, and wherein the piece of sheet metal is rolled along a rolling axis that is at least approximately perpendicular to the first edge.
16. A method comprising: forming an array of passages comprising a plurality of passages having a distribution of passage cross sectional flow areas and passage lengths, the passage length and passage cross sectional area of each of the plurality of passages being paired to create an
approximately equal flow rate per unit area for exhaust gases flowing through each of the plurality of passages;
positioning the array of passages such that the array of passages at least partially fills a conduit cross sectional flow area of a tubular conduit for conducting exhaust gases from an exhaust gas source; and
connecting a collector chamber positioned downstream of the array of passages to receive exhaust gases exiting the plurality of passages, the collector chamber having a sufficiently large collector chamber volume such that the exhaust gases within the collector volume present an approximately equivalent pressure across an exit face of each of the plurality of passages.
17. A method as in claim 16, further comprising forming a plurality of second passages positioned within a second section of the tubular conduit downstream of the collector chamber, each of the plurality of second passages having a second passage length and a second passage cross sectional flow area, the second passage length and second passage cross sectional area of each of the plurality of second passages being paired to create a second approximately equal flow rate across the tubular conduit for exhaust gases flowing through the second plurality of passages.
18. A method as in any of claims 16 to 17, further comprising coating at least part of an interior surface area of one or more of the plurality of passages with a coating comprising a catalyst material.
19. A method as in claim 18, wherein the catalyst material catalyzes at least one reaction that converts at least one combustion by-product present in the exhaust gases to at least one target compound.
20. A method as in any of claims 16 to 19, further comprising roughening at least part of an interior surface area of one or more of the plurality of passages, the roughening increasing a roughness of the at least part of the interior surface area relative to an untreated surface of the passage.
21. A method as in claim 20, wherein the roughening comprises applying a surface roughening treatment to the at least part of the interior surface area.
22. A method as in any of claims 16 to 21 , wherein the forming of the plurality of passages comprises creating a plurality of corrugations on an approximately triangular piece of sheet metal comprising a first edge, a second edge, and a third edge, the plurality of corrugations being spaced at a distance that is proportional to a distance between the second and third edges and having differing lengths that form the plurality of passages when the piece of sheet metal is rolled along a rolling axis that is at least approximately perpendicular to the first edge to fit within the conduit cross sectional flow area.
PCT/US2011/055505 2010-10-08 2011-10-08 Sound attenuation device and method for a combustion engine WO2012048314A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201180059311.XA CN103403308B (en) 2010-10-08 2011-10-08 The muffling device of combustion engine and method
US13/271,096 US20120090298A1 (en) 2010-10-08 2011-10-11 Engine combustion condition and emission controls

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39153010P 2010-10-08 2010-10-08
US61/391,530 2010-10-08

Publications (2)

Publication Number Publication Date
WO2012048314A1 WO2012048314A1 (en) 2012-04-12
WO2012048314A4 true WO2012048314A4 (en) 2012-05-31

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2011/055505 WO2012048314A1 (en) 2010-10-08 2011-10-08 Sound attenuation device and method for a combustion engine

Country Status (3)

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CN (1) CN103403308B (en)
TW (1) TW201233887A (en)
WO (1) WO2012048314A1 (en)

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US20150318815A1 (en) * 2012-12-05 2015-11-05 Triangle Resource Holding (Switzerland) Ag Combustion, heat-exchange and emitter device
JP6568214B2 (en) * 2014-11-10 2019-08-28 トゥラ テクノロジー インコーポレイテッドＴｕｌａ Ｔｅｃｈｎｏｌｏｇｙ，Ｉｎｃ． Multistage skip fire
KR20170097153A (en) * 2014-12-19 2017-08-25 제네럴 일렉트릭 컴퍼니 Active noise control system
TWI585291B (en) * 2016-03-17 2017-06-01 Kwang Yang Motor Co Locomotive engine exhaust
LU93152B1 (en) * 2016-07-18 2018-03-05 Brevex S A Sound neutralizing device for firearms
WO2018022559A1 (en) * 2016-07-25 2018-02-01 Borla David Akiba Timbre scaled exhaust system
CN107213999B (en) * 2017-06-26 2019-04-23 苏州市海新机电工业设备有限公司 A kind of rotation silencing means

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US1903803A (en) * 1926-06-04 1933-04-18 Maurice E Barker Catalyst for oxidizing carbon monoxide in exhaust gases
US3105570A (en) * 1962-04-17 1963-10-01 Bezemes Nicholas Internal combustion engine exhaust muffler
GB1419781A (en) * 1972-10-28 1975-12-31 Norton Villiers Ltd Exhaust silencers
JP3697782B2 (en) * 1996-07-08 2005-09-21 株式会社豊田自動織機 Compressor muffler structure
CN2343349Y (en) * 1998-10-28 1999-10-13 李戈夫 Straight-type multi-porous silencing chamber
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CN2937493Y (en) * 2006-06-09 2007-08-22 东莞市康菱机电设备工程有限公司 Two-stage silencer for diesel generator

Also Published As

Publication number Publication date
CN103403308B (en) 2016-11-16
WO2012048314A1 (en) 2012-04-12
TW201233887A (en) 2012-08-16
CN103403308A (en) 2013-11-20

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