EP0380394A1 - Abgasschalldämpfer und Auspuffvorrichtung mit diesem Schalldämpfer - Google Patents

Abgasschalldämpfer und Auspuffvorrichtung mit diesem Schalldämpfer Download PDF

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Publication number
EP0380394A1
EP0380394A1 EP90400167A EP90400167A EP0380394A1 EP 0380394 A1 EP0380394 A1 EP 0380394A1 EP 90400167 A EP90400167 A EP 90400167A EP 90400167 A EP90400167 A EP 90400167A EP 0380394 A1 EP0380394 A1 EP 0380394A1
Authority
EP
European Patent Office
Prior art keywords
silencer
exhaust
tube
gases
inner tube
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP90400167A
Other languages
English (en)
French (fr)
Inventor
Henri Lescher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Glaenzer Spicer SA
Original Assignee
Glaenzer Spicer SA
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 Glaenzer Spicer SA filed Critical Glaenzer Spicer SA
Publication of EP0380394A1 publication Critical patent/EP0380394A1/de
Withdrawn legal-status Critical Current

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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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • 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
    • F01N1/12—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels
    • F01N1/125—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using spirally or helically shaped channels in combination with sound-absorbing materials
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/022—Exhaust treating devices having provisions not otherwise provided for for cooling the device using air
    • 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
    • F01N2470/12—Tubes being corrugated

Definitions

  • the present invention relates to a silencer for exhaust gases of an internal combustion engine of the type comprising an outer cylindrical casing and an inner coaxial cylindrical tube which delimit between them an annular cylindrical chamber in which are admitted the exhaust gases which penetrate in the silent.
  • the invention also relates to an exhaust line part incorporating such a silencer.
  • the high temperature of the exhaust gases generally has the drawback of making the materials, and in particular the metals, that make up the silencers work, often beyond the permissible conditions that are bearable in the long term.
  • vibrations at low frequencies created by the succession of explosions at certain speeds and by the mechanical excitation of certain organs such as the engine-muffler connection tubes as well as the transverse partitions of the muffler that are struck by the exhaust gases. , cause significant discomfort and cause a thud in the passenger compartment of the vehicle.
  • the aim of the present invention is to propose a silencer which makes it possible to reduce and distribute the temperature spikes to which the materials constituting the silencer are subjected and to simultaneously transform most of the low frequencies into medium and high frequencies which are more easy to cushion and absorb.
  • the invention must also make it possible to suppress the impact of the gas shock wave against walls or bottoms perpendicular to the direction of propagation of the gases and to distribute the gas jet over a larger surface.
  • the invention provides a silencer characterized in that the inner tube is a perforated tube, a first open end of which constitutes the single inlet for the gases into the silencer and the opposite opposite end of which is closed, and that the inner wall of the outer envelope is coated with a layer of absorbent material which extends axially substantially over the entire length of the inner tube.
  • the other closed end of the inner tube is shaped to cause the reflection of the gases.
  • the invention also provides an exhaust line part for the flow of exhaust gases from an internal combustion engine, of the type comprising a continuous external envelope of substantially constant cross section enclosing at least one acoustic attenuation block positioned longitudinally in the envelope so as to delimit at least one transfer section of the fluid of determined length so that the latter participates in the acoustic attenuation function of the part of exhaust line, characterized in that at least one section of the exhaust line portion is produced so as to constitute a silencer according to the invention, said continuous outer casing of substantially constant section forming the outer cylindrical casing of the silencer .
  • the section forming a silencer may for example be the inlet section of the exhaust line, and the exhaust line comprises a connection portion which connects the internal wall of the external envelope to the open end of the inner tube.
  • the partial section view of the figure represents a silencer 10, the cylindrical outer casing 12 of which is connected to a cylindrical inner tube 14 for admitting the gases by a conical connection portion 16.
  • the inner cylindrical tube 14 has a first open end 17 through which all of the exhaust gases circulating in a part of the exhaust line (not shown) are admitted thanks to the connection portion 16 which guides all of the gases to this open end.
  • the second end 18 of the inner tube 14 is one end closed by a flattened solid portion, that is to say non-perforated, against which come to reflect at least a part B of the gases A which penetrate into the inner tube 14. Any form from the end 18, for example of revolution, having no wall perpendicular to the flow and causing the reflection of the gases may be suitable for closing the tube.
  • the wall of the inner tube is perforated so as to allow the admission of the gases C into the annular cylindrical internal chamber 22 delimited radially by the outer wall of the tube interior 14 and through the internal wall of the exterior envelope 12.
  • the inner wall of the outer casing 12 is lined by an annular sleeve made of absorbent material 24.
  • the absorbent material may for example be a layer of steel wool maintained pressed radially outwards by a helical spring 26.
  • the coefficient of heat transferability of the material, for example aluminum, constituting the outer envelope 12 is chosen to be significantly greater than the coefficient of the absorbent material 24 so as to create a large temperature gradient, the thermal shock being absorbed by the absorbent material 24.
  • the length of the perforated inner tube 14 is large enough to allow a distribution of the heat flux to be absorbed over a large cylindrical surface and not punctual.
  • the inner tube 14 is also long enough not to create a back pressure which is harmful to the general flow of gases in the exhaust line.
  • shock wave does not at any time meet a wall perpendicular to the general direction of its propagation.
  • the low frequencies are transformed into medium and high frequencies by a phenomenon called "whistle".
  • the absorbent material 24 also participates in the acoustic attenuation function by absorbing a large part of these medium and high frequencies.
  • the reflected gases which emerge from the absorbent material have given up part of their calories, the latter gradually evacuating towards the outside to reach the envelope 12 which constitutes the medium for exchange with the outside air.
  • the final exchange surface can be increased by providing a corrugated zone 30 which projects radially outwards.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP90400167A 1989-01-27 1990-01-22 Abgasschalldämpfer und Auspuffvorrichtung mit diesem Schalldämpfer Withdrawn EP0380394A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8901064A FR2642470A1 (fr) 1989-01-27 1989-01-27 Silencieux pour gaz d'echappement et partie de ligne d'echappement comportant un tel silencieux
FR8901064 1989-01-27

Publications (1)

Publication Number Publication Date
EP0380394A1 true EP0380394A1 (de) 1990-08-01

Family

ID=9378204

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90400167A Withdrawn EP0380394A1 (de) 1989-01-27 1990-01-22 Abgasschalldämpfer und Auspuffvorrichtung mit diesem Schalldämpfer

Country Status (3)

Country Link
US (1) US5109950A (de)
EP (1) EP0380394A1 (de)
FR (1) FR2642470A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0420266A2 (de) * 1989-09-29 1991-04-03 Tanabe Seiyaku Co., Ltd. Chromen- oder Thiochromenderivate, Verfahren zu deren Herstellung, Zwischenprodukte dafür, pharmazeutische Zusammensetzungen, die diese Derivate enthalten, und die Verwendung dieser Derivate

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT407772B (de) * 1994-11-08 2001-06-25 Habsburg Lothringen Leopold In Kombinierte resonator- und schalldämpferanlage
US5831223A (en) 1997-09-24 1998-11-03 Kesselring; Stephen H. Self-tuning exhaust muffler
US6138791A (en) * 1998-03-10 2000-10-31 Bay Industries, Inc. Muffler sleeve, and method and apparatus for manufacturing same
FR2785360A1 (fr) * 1998-11-03 2000-05-05 Decibel France Sa Dispositif permettant de reduire la production sonore liee a l'ecoulement d'un fluide par fractionnement du flux a l'aide de diffuseurs a perforations multiples
FR2834312B1 (fr) * 2001-12-27 2006-11-24 Acoustique Ind Sarl Soc D Diffuseur silencieux pour la detente de gaz
CA2498409C (en) * 2004-03-03 2011-05-17 Sylvain Lalonde Compact silencer
DE102004057110B9 (de) * 2004-11-26 2008-04-30 Andreas Stihl Ag & Co. Kg Abgasanlage eines durch einen Verbrennungsmotor angetriebenen Arbeitsgerätes
JP2008082312A (ja) * 2006-09-29 2008-04-10 Denso Corp 吸気装置
US7631725B2 (en) * 2006-10-06 2009-12-15 Ingersoll Rand Company Exhaust system
KR100755722B1 (ko) * 2007-03-08 2007-09-05 한국뉴매틱(주) 공압장치용 사일렌서
US8408359B2 (en) * 2009-02-27 2013-04-02 Institute Of Acoustics, Chinese Academy Of Sciences Acoustic attenuation method based on acoustic ray deflection theory and a muffler
US9404365B2 (en) * 2013-02-13 2016-08-02 Taylor's Industrial Coatings, Inc. Steam diffusing apparatus and related methods
JP2014233796A (ja) * 2013-06-03 2014-12-15 株式会社ディスコ 加工装置
CN103671281A (zh) * 2013-11-06 2014-03-26 曹莹莹 一种鼓风机出口管道式消声器
CA2947849A1 (en) * 2014-04-07 2015-10-15 Exhaust Technologies, Inc. Muffler for pneumatic power tool and pneumatic power tool incorporating the same
RU2553591C1 (ru) * 2014-07-22 2015-06-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Казанский национальный исследовательский технический университет им. А.Н. Туполева-КАИ" (КНИТУ-КАИ) Устройство очистки отработанных газов
US9534525B2 (en) 2015-05-27 2017-01-03 Tenneco Automotive Operating Company Inc. Mixer assembly for exhaust aftertreatment system
US9938872B2 (en) 2015-06-09 2018-04-10 Bay Fabrication, Inc. Muffler insert, and systems, methods and apparatus for making

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523260A (en) * 1946-03-28 1950-09-26 John M Campbell Baffle type muffler with refractory lining
FR1129207A (fr) * 1955-07-23 1957-01-17 Perfectionnements apportés aux silencieux ou pots d'échappement
US2913870A (en) * 1955-01-19 1959-11-24 George E Lashley Exhaust system
US3710891A (en) * 1971-08-25 1973-01-16 R Flugger Automotive muffler
US3732948A (en) * 1971-09-20 1973-05-15 Nat Southwire Aluminum Muffler for aluminum cell tapping crucible
US3901350A (en) * 1972-06-30 1975-08-26 Eberspaecher J Muffler for a rotor vehicle internal combustion engine
FR2282533A1 (fr) * 1974-08-20 1976-03-19 Burgess Ind Silencieux
FR2589195A1 (fr) * 1985-10-25 1987-04-30 Vibrasonic Cheminee insonorisee pour gaz chauds ejectes d'un tube d'echappement

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GB319626A (en) * 1928-06-18 1929-09-18 Samuel Newbigin Kent Improvements in or relating to guide plates or retarders for the tubes or coils of heat exchangers, exhaust silencers or the like
US1909394A (en) * 1930-05-31 1933-05-16 Bendix Aviat Corp Muffler
US2646854A (en) * 1948-09-22 1953-07-28 Walker George Bromhead Baffle type muffler having a plurality of helical passages
US2613758A (en) * 1948-10-14 1952-10-14 Cullum Douglas Jack Wayth Baffle type muffler with sound absorbing material
US2640557A (en) * 1950-12-13 1953-06-02 Fuller Co Retroverted passage type muffler with outer conduit formed of sound absorbing material
US2911055A (en) * 1957-12-13 1959-11-03 Mcdonald William Engine exhaust silencer
US2990906A (en) * 1958-10-08 1961-07-04 Koppers Co Inc Acoustic absorber
FR1226438A (fr) * 1958-10-09 1960-07-11 Silencieux pour l'écoulement des fluides
US3119459A (en) * 1961-02-13 1964-01-28 Arvin Ind Inc Sound attenuating gas conduit
FR1301056A (fr) * 1961-08-02 1962-08-10 Arvin Ind Inc Conduit à gaz réalisant l'atténuation des sons
US3147097A (en) * 1962-04-09 1964-09-01 Aguas Cayetano Engine exhaust cleaner and muffler
US3292731A (en) * 1965-04-12 1966-12-20 James L Ballard Exhaust muffler pipe assembly
DE1954319A1 (de) * 1969-10-29 1971-05-06 Rudolf Heberlein Auspufftopf fuer Brennkraftmaschinen
US3580357A (en) * 1970-05-22 1971-05-25 Gen Motors Corp Wave interference silencing system
US3746126A (en) * 1971-07-09 1973-07-17 Cardenas I De Sound-muffling device
US4263982A (en) * 1979-08-06 1981-04-28 Feuling James J Muffler for internal combustion engines and method of manufacturing same
US4530418A (en) * 1982-06-01 1985-07-23 Currie Neil L Automotive exhaust system
US4685534A (en) * 1983-08-16 1987-08-11 Burstein A Lincoln Method and apparatus for control of fluids
US4667770A (en) * 1986-10-02 1987-05-26 Devane Harry M Sound attenuator
US4712643A (en) * 1987-02-17 1987-12-15 Nelson Industries, Inc. Particulate trap exhaust muffler

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523260A (en) * 1946-03-28 1950-09-26 John M Campbell Baffle type muffler with refractory lining
US2913870A (en) * 1955-01-19 1959-11-24 George E Lashley Exhaust system
FR1129207A (fr) * 1955-07-23 1957-01-17 Perfectionnements apportés aux silencieux ou pots d'échappement
US3710891A (en) * 1971-08-25 1973-01-16 R Flugger Automotive muffler
US3732948A (en) * 1971-09-20 1973-05-15 Nat Southwire Aluminum Muffler for aluminum cell tapping crucible
US3901350A (en) * 1972-06-30 1975-08-26 Eberspaecher J Muffler for a rotor vehicle internal combustion engine
FR2282533A1 (fr) * 1974-08-20 1976-03-19 Burgess Ind Silencieux
FR2589195A1 (fr) * 1985-10-25 1987-04-30 Vibrasonic Cheminee insonorisee pour gaz chauds ejectes d'un tube d'echappement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0420266A2 (de) * 1989-09-29 1991-04-03 Tanabe Seiyaku Co., Ltd. Chromen- oder Thiochromenderivate, Verfahren zu deren Herstellung, Zwischenprodukte dafür, pharmazeutische Zusammensetzungen, die diese Derivate enthalten, und die Verwendung dieser Derivate
EP0420266A3 (en) * 1989-09-29 1991-09-11 Tanabe Seiyaku Co., Ltd. Chromene or thiochromene derivatives, process for preparing the same, intermediate therefor, pharmaceutical compositions containing said derivatives and the use of said derivatives

Also Published As

Publication number Publication date
US5109950A (en) 1992-05-05
FR2642470A1 (fr) 1990-08-03

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