EP0274659B1 - Absorptions-/Reflexions-Abgasschalldämpfer - Google Patents

Absorptions-/Reflexions-Abgasschalldämpfer Download PDF

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Publication number
EP0274659B1
EP0274659B1 EP87118057A EP87118057A EP0274659B1 EP 0274659 B1 EP0274659 B1 EP 0274659B1 EP 87118057 A EP87118057 A EP 87118057A EP 87118057 A EP87118057 A EP 87118057A EP 0274659 B1 EP0274659 B1 EP 0274659B1
Authority
EP
European Patent Office
Prior art keywords
resonator
silencer
resonator tube
section
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.)
Expired - Lifetime
Application number
EP87118057A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0274659A1 (de
Inventor
Hermann Dipl.-Ing. Ermer
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.)
Leistritz AG
Original Assignee
Leistritz AG
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 Leistritz AG filed Critical Leistritz AG
Priority to AT87118057T priority Critical patent/ATE63973T1/de
Publication of EP0274659A1 publication Critical patent/EP0274659A1/de
Application granted granted Critical
Publication of EP0274659B1 publication Critical patent/EP0274659B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • 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
    • F01N1/24—Silencing apparatus characterised by method of silencing by using 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
    • F01N2210/00—Combination of methods of silencing
    • F01N2210/04—Throttling-expansion and resonance
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction

Definitions

  • the invention relates to an absorption / reflection exhaust gas muffler, in particular in a multi-stage exhaust gas muffler system with a main muffler connected upstream of a rear muffler, with a resonator tube tuned to low frequencies, with a resonator tube arranged in the exhaust gas flow counter to the direction of flow of the main gas stream.
  • the invention is therefore based on the object of designing an absorption / reflection exhaust gas silencer of the type mentioned at the outset in such a way that it ensures, with simple expenditure, a high level of decoupling of the sound component to be damped in the reflector and in particular in this way the so-called start-up hum can be eliminated.
  • the resonator tube projects into the exhaust gas stream, the ratio of the cross section to the cross section of the exhaust gas duct surrounding it being approximately 1: 3 in the mouth region of the resonator tube.
  • the direct protrusion of the resonator tube into the exhaust gas flow - which is in contrast to the construction of an exhaust gas silencer as described in DE-PS 28 39 756 - also has a number of consequences with regard to sound attenuation, which do not occur in the arrangement according to this patent specification can.
  • the direct protrusion of the resonator tube 7 into the sound-guiding channel 6 results in a cross-sectional constriction, which results in a reflection attenuation according to the formula leads.
  • a very important special feature of this direct protrusion of the resonator tube which is not present in DE-PS 28 39 756, also results from the special objective of the present invention, namely the damping of low frequencies. If you assume, for example, a frequency of 60 Hz, the wavelength at an exhaust gas temperature of 400 ° C (calculated from the formula therefore approx.8.7 m. A wave of this wavelength can only be coupled into a resonator via a resonator tube if the sound wave runs directly into the resonator tube. If, for example, a cross tube were connected to the side, which runs transversely to the sound-conducting channel, a sound wave with such a large wavelength cannot be coupled in at all.
  • the perforated exhaust pipe passing through the absorber part should be designed as curved as possible, it has also proven to be advantageous if the exhaust pipe has a counter-cone downstream of the mouth of the resonator pipe.
  • absorption exhaust muffler with an additional built-in special resonator can also be used on its own, it has proven to be particularly effective to use it as part of a multi-stage exhaust muffler system, and because of its very favorable damping properties it is sufficient to have a rear muffler connected downstream to be designed as a simple Helmholtz resonator, whereas in the case of previous multi-stage exhaust silencers it was usually necessary to design the rear silencer in a very complex manner in order to achieve the desired damping values. It is up to the particular engine conditions whether a front silencer is used or not, the structure of the front silencer being relatively uncritical with regard to the damping properties of the main silencer.
  • the muffler shown in FIGS. 1 and 2 particularly suitable as a center muffler in multi-stage exhaust gas muffler systems, comprises a preferably made of drawn Half-shell muffler housing 1, in which a first absorber-muffler chamber 2 is arranged, which is penetrated by a curved exhaust pipe 3 provided with gas outlet bores 4, which are only indicated in the illustration. From the inlet pipe 5, which can be coupled, for example, to the outlet of a pre-silencer, the exhaust pipe initially widens to a nominal exhaust duct inlet cross section D.
  • the arrangement is chosen such that the central section 9 of the U-shaped resonator tube runs essentially closely adjacent to one of the narrow sides of the flat muffler housing 1, so that it lies between this narrow side and a corresponding indentation 10 between the absorber section 2 and the Resonator space 8 arranged lid 11 can be inserted.
  • a counter cone 12 is provided downstream of the mouth of the resonator tube 7, the distance of which from the point 6, at which the nominal exhaust gas duct cross section D is reached, should correspond approximately to this diameter D.
  • the frequency F at which the start-up hum occurs is determined by the basic motor frequency at the corresponding speed n and results in (Number of cylinders), which means a frequency of about 50 Hz for a 4-cylinder engine and a frequency of 75 Hz for a 6-cylinder engine.
  • the frequency of the resonator formed by the resonator tube 7 and the resonance chamber 8 is placed on this corresponding frequency value, this frequency resulting where V is the resonator volume, A is the cross-sectional area of the resonator tube and 1 is its length. This is also indicated in the exemplary embodiment according to FIGS.
  • a simple Helmholtz resonator is shown as it can be used in connection with a silencer according to Figures 1 and 2 as a rear silencer. Due to the particularly advantageous damping properties of the resonator according to FIGS. 1 and 2, no complicated rear silencer is required, but a simple rear silencer such as that shown in FIG. 3 is sufficient for practically all applications.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Pipe Accessories (AREA)
EP87118057A 1986-12-09 1987-12-07 Absorptions-/Reflexions-Abgasschalldämpfer Expired - Lifetime EP0274659B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87118057T ATE63973T1 (de) 1986-12-09 1987-12-07 Absorptions-/reflexions-abgasschalldaempfer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3641942 1986-12-09
DE19863641942 DE3641942A1 (de) 1986-12-09 1986-12-09 Absorptions-abgasschalldaempfer

Publications (2)

Publication Number Publication Date
EP0274659A1 EP0274659A1 (de) 1988-07-20
EP0274659B1 true EP0274659B1 (de) 1991-05-29

Family

ID=6315740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118057A Expired - Lifetime EP0274659B1 (de) 1986-12-09 1987-12-07 Absorptions-/Reflexions-Abgasschalldämpfer

Country Status (4)

Country Link
EP (1) EP0274659B1 (enrdf_load_stackoverflow)
AT (1) ATE63973T1 (enrdf_load_stackoverflow)
DE (1) DE3641942A1 (enrdf_load_stackoverflow)
ES (1) ES2022280B3 (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4330129C2 (de) * 1993-09-06 2002-08-29 Bayerische Motoren Werke Ag Abgasanlage einer Brennkraftmaschine
DE29607010U1 (de) * 1996-04-18 1997-08-14 Heinrich Gillet Gmbh & Co Kg, 67480 Edenkoben Schalldämpfer
US6520286B1 (en) 1996-09-30 2003-02-18 Silentor Holding A/S Silencer and a method of operating a vehicle
EP1403476B1 (en) * 1996-09-30 2010-06-16 Silentor Holding A/S Gas flow silencer
US6799657B2 (en) 2002-10-02 2004-10-05 Carrier Corporation Absorptive/reactive muffler for variable speed compressors
JP4072854B2 (ja) 2003-06-17 2008-04-09 本田技研工業株式会社 能動型振動騒音制御装置
JP3919701B2 (ja) 2003-06-17 2007-05-30 本田技研工業株式会社 能動型振動騒音制御装置
RU2333370C1 (ru) * 2006-12-06 2008-09-10 Ярослав Владимирович Шевченко Глушитель шума
DE102008046870A1 (de) 2008-09-11 2009-11-26 Bombardier Transportation Gmbh Schalldämpfung im Abgasweg eines Schienenfahrzeug-Verbrennungsmotors
US9394812B2 (en) * 2014-07-09 2016-07-19 Aai Corporation Attenuating engine noise using a reverse resonator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3035332A1 (de) * 1980-09-19 1982-05-06 Fa. J. Eberspächer, 7300 Esslingen Kombinierter abgasschalldaempfer
DE2839756C2 (de) * 1978-09-13 1984-08-30 Friedrich Boysen Gmbh & Co Kg, 7272 Altensteig Abgas-Schalldämpfer für Brennkraftmaschinen mit gesonderten Abgasleitungen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE727758C (de) * 1940-12-10 1942-11-11 Eberspaecher J Schalldaempferanordnung, bei der die zwischen Motor und Schalldaempfer vorhandene Leitung etwa bei einem Viertel der Wellenlaenge mit der Grundschwingung in Resonanz ist
DE1712462U (de) * 1954-06-02 1955-12-08 Auto Union Gmbh Auspuffanlage fuer zweitakt-brennkraftmaschinen.
FR1158585A (fr) * 1956-09-18 1958-06-17 Perfectionnement aux silencieux devant être montés sur un tube d'échappement court de moteur à explosions
US3209858A (en) * 1963-06-25 1965-10-05 Walker Mfg Co Muffler having depressed channel forming tuning passages
DE2115240B2 (de) * 1971-03-30 1973-03-01 Zeuna-Stärker KG, 8900 Augsburg Schalldaempfer
DE2206875A1 (de) * 1972-02-14 1973-08-16 Motor Condensator Walker Manuf Schalldaempfer
DE2706957C2 (de) * 1977-02-18 1983-04-07 Friedrich Boysen Gmbh & Co Kg, 7272 Altensteig Abgasschalldämpfer
DE2856889A1 (de) * 1978-12-30 1980-11-20 Zeuna Staerker Kg Schalldaempfer in der abgasleitung eines verbrennungsmotors, insbesondere an einem kraftfahrzeug
FR2489881A1 (fr) * 1980-09-08 1982-03-12 Peugeot Silencieux d'echappement a resonateur incorpore, pour moteur a combustion
FR2502693A1 (fr) * 1981-03-26 1982-10-01 Wissembourg Sa Const Metallurg Silencieux pour moteurs de vehicules automobiles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2839756C2 (de) * 1978-09-13 1984-08-30 Friedrich Boysen Gmbh & Co Kg, 7272 Altensteig Abgas-Schalldämpfer für Brennkraftmaschinen mit gesonderten Abgasleitungen
DE3035332A1 (de) * 1980-09-19 1982-05-06 Fa. J. Eberspächer, 7300 Esslingen Kombinierter abgasschalldaempfer

Also Published As

Publication number Publication date
ATE63973T1 (de) 1991-06-15
ES2022280B3 (es) 1991-12-01
DE3641942C2 (enrdf_load_stackoverflow) 1992-10-22
EP0274659A1 (de) 1988-07-20
DE3641942A1 (de) 1988-06-23

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