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DE19855708A1 - Acoustic tubular damper has outer casing, inner pipe with transverse lot and rectangular cavity, knitted fabric damping and volume cavities - Google Patents

Acoustic tubular damper has outer casing, inner pipe with transverse lot and rectangular cavity, knitted fabric damping and volume cavities

Info

Publication number
DE19855708A1
DE19855708A1 DE1998155708 DE19855708A DE19855708A1 DE 19855708 A1 DE19855708 A1 DE 19855708A1 DE 1998155708 DE1998155708 DE 1998155708 DE 19855708 A DE19855708 A DE 19855708A DE 19855708 A1 DE19855708 A1 DE 19855708A1
Authority
DE
Germany
Prior art keywords
knitted fabric
outer casing
damping
inner pipe
rectangular cavity
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.)
Granted
Application number
DE1998155708
Other languages
German (de)
Other versions
DE19855708B4 (en
Inventor
Dietrich Denker
Marcus Tuerk
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.)
DENKER, DIETRICH, PROF. DR.-ING., DE
Tuerk Marcus Dipl-Wirtsch-Ing De
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE1998155708 priority Critical patent/DE19855708B4/en
Priority to DE29825193U priority patent/DE29825193U1/en
Publication of DE19855708A1 publication Critical patent/DE19855708A1/en
Application granted granted Critical
Publication of DE19855708B4 publication Critical patent/DE19855708B4/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • F16L55/0336—Noise absorbers by means of 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
    • F01N1/003—Silencing apparatus characterised by method of silencing by using dead chambers communicating with gas flow passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/24—Heat or noise insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/78—Other construction of jet pipes
    • F02K1/82—Jet pipe walls, e.g. liners
    • F02K1/827—Sound absorbing structures or liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1255—Intake silencers ; Sound modulation, transmission or amplification using resonance
    • F02M35/1266—Intake silencers ; Sound modulation, transmission or amplification using resonance comprising multiple chambers or compartments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1272—Intake silencers ; Sound modulation, transmission or amplification using absorbing, damping, insulating or reflecting materials, e.g. porous foams, fibres, rubbers, fabrics, coatings or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • F16L55/0335—Noise absorbers by means of external rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/40—Application in turbochargers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/10—Two-dimensional
    • F05D2250/12—Two-dimensional rectangular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/96—Preventing, counteracting or reducing vibration or noise

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)

Abstract

The acoustic damper consists of a pipe with outer casing (1) produced such as by compression deformation from one piece. The outer casing contains an inner pipe (2) which alternately has a narrow transverse slit (6) and a large, rectangular cavity (5) or the same two in the reverse order. Knitted fabric damping (9) is applied between the volume cavities (3) formed by the outer pipe.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur beitbandigen Absenkung von Strömungsgeräuschen bei gleichzeitiger Anwesenheit hoher Temperaturen und Drücke sowie geringen Bauräumen.The present invention relates to a device for the two-band lowering Flow noise in the presence of high temperatures and pressures as well small installation space.

Derartige Geräusche kommen z. B. bei Abgasturboladern vor, die infolge hoher Drehzahlen nicht beherrschbare Unwuchten sowie Störungen durch fertigungsbedingte Verzüge (z. B. Schaufeln) aufweisen.Such noises come e.g. B. in exhaust gas turbochargers before, due to high speeds Uncontrollable imbalances and malfunctions due to production-related delays (e.g. Blades).

Diese lästigen Geräusche werden sowohl über Luft- als auch Körperschall abgestrahlt, so daß hinsichtlich beider Komponenten Lösungen erforderlich sind.These annoying noises are emitted both via airborne and structure-borne noise, so that solutions for both components are required.

Deshalb wird eine geeignete Anordnung von Volumenkombinationen kleiner Abmessungen zur bereitbandigen Absenkung von Strömungsgeräuschen vorgeschlagen, die darüber hinaus hohe Temperaturen und Drücke beherrscht. Denn die mit dieser Anwendung verbundenen Randbedingungen lassen metallische Werkstoffe deutlich geeigneter erscheinen als z. B. heute übliche Kunststoffe für periphere Einsätze an Motoren.Therefore, a suitable arrangement of volume combinations of small dimensions for the ready-band reduction of flow noise, which is also proposed masters high temperatures and pressures. Because those associated with this application Boundary conditions make metallic materials appear much more suitable than e.g. B. Today's common plastics for peripheral applications on engines.

Diese Vorgabe metallischer Werkstoffe erfordert neben der Dämmfunktion geeignete, kostengünstige Fertigungsverfahren, was aus einer speziellen Kombination von Außenmantel (1) und Innenrohr (2) realisiert ist. (Bild 1).In addition to the insulation function, this specification of metallic materials requires suitable, cost-effective manufacturing processes, which is realized from a special combination of outer jacket ( 1 ) and inner tube ( 2 ). ( Photo 1).

Der Außenmantel ist dabei derart geformt, daß Volumenkammern (3) z. B. als Doppelkammer (4) entstehen. Dabei erfolgt ein Abschluß der Volumenkammern (3) durch einerseits den Außenmantel (1) sowie andererseits durch das Innenrohr (2), das abgestimmte Öffnungen (5/6) aufweist. Diese Öffnungen (5/6) im Innenrohr (2) können je nach Anforderung unterschiedliche Formen, wie Schlitze, Bohrungen, rechteckförmige Aussparungen etc. aufweisen. Besonders breitbandige Absenkungen ergeben sich bereits aus einer Anordnung von zwei Kammern: die erste Kammer erhält eine große Aussparung (5) und die zweite einen Querschlitz (6), die zudem noch optimal in Längsrichtung plaziert werden.The outer jacket is shaped such that volume chambers ( 3 ) z. B. arise as a double chamber ( 4 ). Here, a conclusion of the volume chambers (3) takes place by on the one hand the outer shell (1) and on the other hand through the inner tube (2), the tuned openings (5/6). These openings (5/6) in the inner tube (2) may have different shapes depending on the requirements, etc., such as slots, holes, rectangular notches. Particularly broadband subsidence results from an arrangement of two chambers: the first chamber has a large recess ( 5 ) and the second a transverse slot ( 6 ), which are also optimally placed in the longitudinal direction.

Die besondere Gestaltung des Außenmantels (1) läßt z. B. eine kostengünstige Fertigung über geeignete Druckbeaufschlagung von Halbzeugrohren realisieren, so daß ein wellenförmiger Außenmantel gebildet wird, in den das Innenrohr (2) eingeschoben und verschweißt wird. Die Innenrohr-Enden (7) lassen sich dann noch zur Aufnahme von Anschlüssen (8) nach Vorgaben entsprechend gestalten.The special design of the outer jacket ( 1 ) z. B. realize an inexpensive production by suitable pressurization of semi-finished tubes, so that a wavy outer jacket is formed, into which the inner tube ( 2 ) is inserted and welded. The inner tube ends ( 7 ) can then be designed accordingly to accommodate connections ( 8 ).

Gerade hochfrequente Störungen bei Strömungsvorgängen erfordern jedoch zusätzlich Maßnahmen zur Minderung des Körperschalls, der über die Rohverbindungen weitergeleitet wird. Deshalb erfolgt bedarfsweise eine Bedämpfung der Anordnung über metallische Gestricke (9) derart, daß z. B. eine Applikation raumsparend zwischen den Volumenkammern (3) vorgenommen wird. Andere Möglichkeiten der Rohrkammerbedämpfung sind durch Gestricküberzug über die gesamte Vorrichtung als Gestrickmantel oder durch gezielte Applikationen an den Rohrenden möglich.However, high-frequency disturbances in flow processes require additional measures to reduce structure-borne noise, which is passed on via the raw connections. Therefore, if necessary, the arrangement is damped using metallic knitted fabrics ( 9 ) such that, for. B. an application is made space-saving between the volume chambers ( 3 ). Other options for damping the tube chamber are possible by covering the entire device as a knitted jacket or by targeted applications at the tube ends.

Diese besonders kleine Vorrichtung läßt sich vorteilhaft auch in Doppelausführung hintereinanderschalten, wobei eine noch wesentlich höhere Dämmwirkung erzielt werden kann.This particularly small device can also be advantageously carried out in a double version Connect in series, whereby an even higher insulation effect can be achieved can.

Claims (9)

1. Vorrichtung zur Luft- und Körperschallabsenkung von sowohl Strömungsgeräuschen als auch Körperschallanregungen von z. B. Turboladern an Verbrennungsmotoren1. Device for reducing airborne and structure-borne noise from both flow noise and also structure-borne noise excitation from z. B. turbochargers on internal combustion engines 2. Vorrichtung nach Anspruch 1, die aus einem verformten Rohr einen Außenmantel besitzt.2. Device according to claim 1, which has an outer jacket from a deformed tube. 3. Vorrichtung nach Anspruch 1 bis 2, dessen Außenmantel durch z. B. Druckverformung aus einem Teil gefertigt werden kann.3. Device according to claim 1 to 2, the outer jacket by z. B. Compression deformation a part can be manufactured. 4. Vorrichtung nach Anspruch 1 bis 3, dessen Außenmantel mit einem Innenrohr nach innen versehen wird.4. Apparatus according to claim 1 to 3, the outer jacket with an inner tube to the inside is provided. 5. Vorrichtung nach Anspruch 1 bis 4, dessen Innenrohr abwechselnd einen schmalen Querschlitz und im Folgevolumen eine große, rechteckförmige Aussparung besitzt oder in umgekehrter Reihenfolge angeordnet.5. Apparatus according to claim 1 to 4, the inner tube alternately a narrow Cross slot and in the subsequent volume has a large, rectangular recess or in arranged in reverse order. 6. Vorrichtung nach Anspruch 1 bis 5, die mit zusätzlicher Gestrickdämpfung zur Körperschallminderung ausgestattet wird6. The device according to claim 1 to 5, which with additional knitted fabric damping Structure-borne noise reduction is equipped 7. Vorrichtung nach Anspruch 1 bis 6, bei der die Gestrickdämpfung zwischen die durch das Außenrohr gebildeten Volumenfreiräume appliziert wird.7. The device according to claim 1 to 6, wherein the knitted fabric damping between the Outer tube formed volume clearances is applied. 8. Vorrichtung nach Anspruch 1 bis 7, bei der das Außenrohr mit einem Formschlauch aus Metallgestrick zur Bedämpfung umschlossen wird.8. The device according to claim 1 to 7, wherein the outer tube with a molded tube Metal mesh is enclosed for damping. 9. Vorrichtung nach Anspruch 1 bis 8, die zu Erzielung noch höherer Dämmwerte hintereinandergeschaltet werden kann.9. The device according to claim 1 to 8, to achieve even higher insulation values can be connected in series.
DE1998155708 1998-12-03 1998-12-03 Pipe chamber damper Expired - Lifetime DE19855708B4 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1998155708 DE19855708B4 (en) 1998-12-03 1998-12-03 Pipe chamber damper
DE29825193U DE29825193U1 (en) 1998-12-03 1998-12-03 Acoustic tubular damper has outer casing, inner pipe with transverse lot and rectangular cavity, knitted fabric damping and volume cavities

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1998155708 DE19855708B4 (en) 1998-12-03 1998-12-03 Pipe chamber damper

Publications (2)

Publication Number Publication Date
DE19855708A1 true DE19855708A1 (en) 2000-06-08
DE19855708B4 DE19855708B4 (en) 2009-04-30

Family

ID=7889790

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1998155708 Expired - Lifetime DE19855708B4 (en) 1998-12-03 1998-12-03 Pipe chamber damper

Country Status (1)

Country Link
DE (1) DE19855708B4 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1176355A3 (en) * 2000-07-28 2003-05-28 Trelleborg Ab Noise attenuation arrangements for pressurised-gas conduits
EP1260697A3 (en) * 2001-05-23 2003-11-12 Volkswagen Aktiengesellschaft Turbocharged internal combustion engine
FR2849114A1 (en) * 2002-12-23 2004-06-25 Renault Sa Noise attenuation device for supercharged i.c. engine air inlet circuit comprises pipe section fitted with external circumferential chambers and additional chamber in series communicating with pipe through openings
EP1510666A2 (en) * 2003-08-27 2005-03-02 J. Eberspächer GmbH & Co. KG Resonator
FR2864168A1 (en) * 2003-12-17 2005-06-24 Trelleborg Fluid Systems Geie Noise reducing device for air inlet circuit of vehicle, has pipe section formed by two semi-shells partitioned with partition walls contacting at their free edges that have notches constituting opening in assembled state of semi-shells
DE19956172B4 (en) * 1999-11-23 2006-05-18 Umfotec Gmbh Double chamber damper
EP1857682A1 (en) * 2006-05-18 2007-11-21 Aerzener Maschinenfabrik GmbH Rotary piston machine silencer
WO2013060489A1 (en) * 2011-10-28 2013-05-02 Umfotec Gmbh Damper for air lines of an internal combustion engine having a turbocharger and method for producing said damper
AT13947U1 (en) * 2013-01-16 2015-01-15 Henn Gmbh & Co Kg Silencer and process for its production
EP3159528A1 (en) * 2015-10-23 2017-04-26 Dura Operating, LLC Resonator assembly and manufacturing process for producing the same
US10364928B2 (en) 2013-09-03 2019-07-30 Umfotec Gmbh Resonator
CN114738151A (en) * 2022-05-09 2022-07-12 一汽解放汽车有限公司 Air inlet pipe silencing device and engine
US11521588B2 (en) 2020-03-05 2022-12-06 Umfotec Gmbh Sound attenuator for a fluid flow line and method of manufacturing the same
WO2023175302A1 (en) * 2022-03-14 2023-09-21 Dyson Technology Limited Noise attenuator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012052548A2 (en) 2010-10-22 2012-04-26 Umfotec Umformtechnik Gmbh Wide-band damper for charge air lines of an internal combustion engine with turbocharger
US20130263823A1 (en) 2010-10-25 2013-10-10 Umfotec Umformtechnik Gmbh Disc damper for charge air lines of an internal combustion engine having a turbocharger

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE580923C (en) * 1930-11-05 1933-07-19 Gabriel Becker Muffler for internal combustion engines through acoustic filters
US2367753A (en) * 1940-04-29 1945-01-23 Hayes Ind Inc Method of making mufflers and the like
DE9015414U1 (en) * 1990-11-09 1991-01-24 Alcan Deutschland GmbH, 3400 Göttingen Sound-insulating air or gas guide element
DE4210786C2 (en) * 1992-04-01 1994-11-10 Bayer Ag Sound absorbing resonator for pipes

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19956172C5 (en) * 1999-11-23 2010-09-23 Umfotec Gmbh Double chamber damper
DE19956172B4 (en) * 1999-11-23 2006-05-18 Umfotec Gmbh Double chamber damper
EP1176355A3 (en) * 2000-07-28 2003-05-28 Trelleborg Ab Noise attenuation arrangements for pressurised-gas conduits
EP1260697A3 (en) * 2001-05-23 2003-11-12 Volkswagen Aktiengesellschaft Turbocharged internal combustion engine
FR2849114A1 (en) * 2002-12-23 2004-06-25 Renault Sa Noise attenuation device for supercharged i.c. engine air inlet circuit comprises pipe section fitted with external circumferential chambers and additional chamber in series communicating with pipe through openings
EP1433948A2 (en) * 2002-12-23 2004-06-30 Trelleborg Fluid Systems Geie Air intake silencing device
EP1433948A3 (en) * 2002-12-23 2005-05-04 Trelleborg Fluid Systems Geie Air intake silencing device
EP1510666A2 (en) * 2003-08-27 2005-03-02 J. Eberspächer GmbH & Co. KG Resonator
EP1510666A3 (en) * 2003-08-27 2005-12-07 J. Eberspächer GmbH & Co. KG Resonator
FR2864168A1 (en) * 2003-12-17 2005-06-24 Trelleborg Fluid Systems Geie Noise reducing device for air inlet circuit of vehicle, has pipe section formed by two semi-shells partitioned with partition walls contacting at their free edges that have notches constituting opening in assembled state of semi-shells
EP1553284A1 (en) * 2003-12-17 2005-07-13 Trelleborg Fluid Systems Geie Air intake silencing device especially for turbocharged engines or air conditioner and intake circuit with such a device
EP1857682A1 (en) * 2006-05-18 2007-11-21 Aerzener Maschinenfabrik GmbH Rotary piston machine silencer
WO2013060489A1 (en) * 2011-10-28 2013-05-02 Umfotec Gmbh Damper for air lines of an internal combustion engine having a turbocharger and method for producing said damper
US9784399B2 (en) 2011-10-28 2017-10-10 Umfotec Gmbh Damper for air lines of an internal combustion engine having a turbocharger and method for producing said damper
AT13947U1 (en) * 2013-01-16 2015-01-15 Henn Gmbh & Co Kg Silencer and process for its production
US10364928B2 (en) 2013-09-03 2019-07-30 Umfotec Gmbh Resonator
EP3159528A1 (en) * 2015-10-23 2017-04-26 Dura Operating, LLC Resonator assembly and manufacturing process for producing the same
US11521588B2 (en) 2020-03-05 2022-12-06 Umfotec Gmbh Sound attenuator for a fluid flow line and method of manufacturing the same
WO2023175302A1 (en) * 2022-03-14 2023-09-21 Dyson Technology Limited Noise attenuator
CN114738151A (en) * 2022-05-09 2022-07-12 一汽解放汽车有限公司 Air inlet pipe silencing device and engine

Also Published As

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DE19855708B4 (en) 2009-04-30

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