EP3244130A1 - Exhaust silencer for an exhaust gas conduit, in particular for an exhaust gas conduit emitted from an oil fired boiler - Google Patents

Exhaust silencer for an exhaust gas conduit, in particular for an exhaust gas conduit emitted from an oil fired boiler Download PDF

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Publication number
EP3244130A1
EP3244130A1 EP17169620.6A EP17169620A EP3244130A1 EP 3244130 A1 EP3244130 A1 EP 3244130A1 EP 17169620 A EP17169620 A EP 17169620A EP 3244130 A1 EP3244130 A1 EP 3244130A1
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EP
European Patent Office
Prior art keywords
exhaust
exhaust gas
sound
gas conduit
schallleitkanal
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Granted
Application number
EP17169620.6A
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German (de)
French (fr)
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EP3244130B1 (en
Inventor
Sebastian Viets
Wilfried Gutzeit
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BDR Thermea Group BV
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BDR Thermea Group BV
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Publication of EP3244130A1 publication Critical patent/EP3244130A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
    • F23M20/005—Noise absorbing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2210/00—Noise abatement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2213/00—Chimneys or flues
    • F23J2213/30—Specific materials
    • F23J2213/302—Specific materials plastic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/13003—Means for reducing the noise in smoke conducing ducts or systems

Definitions

  • the invention relates to an exhaust silencer for an exhaust pipe, in particular for an emerging from an oil-fired boiler exhaust pipe, with a sound-absorbing functional chamber, which is connected to at least one exhaust gas inlet and at least one exhaust gas outlet.
  • Exhaust silencers of this type are known in mutually different versions.
  • absorption silencers and reflection silencers.
  • both operating principles are combined in separate functional chambers within an exhaust silencer in the prior art.
  • absorption silencers in this case have at least one absorption chamber filled with sound-absorbing material, the absorption chamber can be coupled via a perforated wall to the exhaust gas stream. With the help of analytical equations systems are formed, this z.
  • the invention has for its object to provide an exhaust muffler of the type mentioned, despite a simple Structure characterized by a good soundproofing.
  • the simpler structure should lead to a cost reduction and also to a space optimization.
  • This object is achieved in that at least a second sound-absorbing function chamber is provided and both function chambers are connected to each other via at least one Schallleitkanal.
  • a structure of functional chambers is formed, which is tunable to the sound to be damped.
  • the function chambers preferably have no flat surfaces and no rectangular basic shapes.
  • the connection of the function chambers via at least one sound-conducting channel advantageously expands the frequency band in which the muffler operates.
  • a Schallleitkanal for connecting the functional chambers may be associated with the exhaust gas inlet according to a development of the invention.
  • the Schallleitkanal leads to a distribution of the main flow of the exhaust gas to the at least two functional chambers.
  • a sound-conducting channel for connecting the functional chambers can be assigned to the exhaust gas outlet. Even shortly before the exit of the exhaust gas from the muffler there is once again the possibility of sound wave propagation into both chambers.
  • the exhaust duct associated with the sound channel may preferably have a smaller width than the exhaust gas inlet associated Schallleitkanal.
  • the exhaust duct associated with the Schallleitkanal does not serve the distribution of the incoming exhaust gas, therefore it may be smaller in size. Sound waves can dissipate at this smaller sized Schallleitkanal, so that their attenuation occurs.
  • the exhaust muffler is made as a one-piece housing.
  • the exhaust silencer consists of housing walls, these can be in one piece z.
  • B. be made of plastic. The use of sound-absorbing materials is not required, so that overall production is simplified.
  • the plastic may be unreinforced, for example polypropylene is used.
  • the exhaust silencer according to the invention can be arranged so that a drain of condensate is possible. It then form no condensate bubbles.
  • Flow channels can be equipped with cross-sections that allow the flow of large amounts of water, such as rain, without the operation of the burner is disturbed.
  • the exhaust silencer according to the invention has a high attenuation in the frequency range between 50 Hz and 200 Hz.
  • the exhaust silencer invention uses the function of damping by fluid-structure interaction, are included in the natural frequencies of the structure.
  • the basic principles of absorption and reflection are combined in order to cover a large frequency spectrum while being as compact as possible and to achieve a high attenuation performance.
  • the function chambers and sound-damping channels are smooth-walled according to a development of the invention. They can be stiffened with ribs or beads.
  • the exhaust muffler in the figures each has a one-piece housing 1.
  • the housing 1 includes a first functional chamber 2 and a second functional chamber 3.
  • the housing 1 of the exhaust muffler each have an exhaust gas inlet 4 and an exhaust gas outlet 5, which are each formed as openings.
  • both function chambers 2, 3 are placed against each other, between them a wide Schallleitkanal is formed.
  • the path of the exhaust gas along a main flow is in FIG. 1 illustrated by arrows 6. Exhaust gas can flow into both function chambers 2, 3.

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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

Bei einem Abgasschalldämpfer für eine Abgasleitung, insbesondere für eine aus einem ölbefeuerten Kessel austretende Abgasleitung, mit einer schalldämmenden Funktionskammer, die mit wenigstens einem Abgaseintritt und wenigstens einem Abgasaustritt abgasleitend verbunden ist, ist vorgesehen, dass zumindest eine zweite schalldämmende Funktionskammer vorgesehen ist und beide Funktionskammern über wenigstens einen Schallleitkanal miteinander verbunden sind.In an exhaust silencer for an exhaust pipe, in particular for an emerging from an oil-fired boiler exhaust pipe, with a sound-absorbing functional chamber, which is connected to at least one exhaust gas inlet and at least one exhaust gas outlet, it is provided that at least a second sound-absorbing functional chamber is provided and both functional chambers on at least one Schallleitkanal are interconnected.

Description

Die Erfindung betrifft einen Abgasschalldämpfer für eine Abgasleitung, insbesondere für eine aus einem ölbefeuerten Kessel austretende Abgasleitung, mit einer schalldämmenden Funktionskammer, die mit wenigstens einem Abgaseintritt und wenigstens einem Abgasaustritt abgasleitend verbunden ist.The invention relates to an exhaust silencer for an exhaust pipe, in particular for an emerging from an oil-fired boiler exhaust pipe, with a sound-absorbing functional chamber, which is connected to at least one exhaust gas inlet and at least one exhaust gas outlet.

Abgasschalldämpfer dieser Bauart sind in voneinander verschiedenen Ausführungen bekannt. Im Stand der Technik wird zwischen Absorptionsschalldämpfern und Reflexionsschalldämpfern unterschieden. Zum Erreichen einer breitbandigen Dämpfung werden im Stand der Technik beide Funktionsprinzipien in getrennten Funktionskammern innerhalb eines Abgasschalldämpfers vereinigt.Exhaust silencers of this type are known in mutually different versions. In the prior art, a distinction is made between absorption silencers and reflection silencers. In order to achieve a broadband damping, both operating principles are combined in separate functional chambers within an exhaust silencer in the prior art.

Bekannte Absorptionsschalldämpfer weisen dabei mindestens eine mit Schallschluckstoff gefüllte Absorptionskammer auf, die Absorptionskammer kann dabei über eine gelochte Wand an den Abgasstrom angekoppelt sein. Mit Hilfe analytischer Gleichungen werden Systeme ausgebildet, dabei werden z. B. Helmholtz-Resonatoren, Kammerschalldämpfer und Flächenresonatoren eingesetzt.Known absorption silencers in this case have at least one absorption chamber filled with sound-absorbing material, the absorption chamber can be coupled via a perforated wall to the exhaust gas stream. With the help of analytical equations systems are formed, this z. B. Helmholtz resonators, chamber mufflers and surface resonators used.

Die bekannten Abgasschalldämpfer sind somit kompliziert aufgebaut.The known exhaust muffler are thus complicated.

Der Erfindung liegt die Aufgabe zugrunde, einen Abgasschalldämpfer der eingangs genannten Gattung aufzuzeigen, der sich trotz eines einfachen Aufbaus durch eine gute Schalldämpfung auszeichnet. Der einfachere Aufbau soll zu einer Kostenreduzierung und auch zu einer Bauraumoptimierung führen.The invention has for its object to provide an exhaust muffler of the type mentioned, despite a simple Structure characterized by a good soundproofing. The simpler structure should lead to a cost reduction and also to a space optimization.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, dass zumindest eine zweite schalldämpfende Funktionskammer vorgesehen ist und beide Funktionskammern über wenigstens einen Schallleitkanal miteinander verbunden sind.This object is achieved in that at least a second sound-absorbing function chamber is provided and both function chambers are connected to each other via at least one Schallleitkanal.

Durch die erfindungsgemäß vorgesehene weitere Funktionskammer wird ein Gebilde von Funktionskammern ausgebildet, das auf das zu dämpfende Geräusch abstimmbar ist. Die Funktionskammern weisen dabei vorzugsweise keine ebenen Flächen und auch keine rechtwinkligen Grundformen auf. Durch die Verbindung der Funktionskammern über wenigstens einen Schallleitkanal wird vorteilhaft das Frequenzband erweitert, in dem der Schalldämpfer arbeitet.By inventively provided further functional chamber a structure of functional chambers is formed, which is tunable to the sound to be damped. The function chambers preferably have no flat surfaces and no rectangular basic shapes. The connection of the function chambers via at least one sound-conducting channel advantageously expands the frequency band in which the muffler operates.

Ein Schallleitkanal zum Verbinden der Funktionskammern kann nach einer Weiterbildung der Erfindung dem Abgaseintritt zugeordnet sein. Hier führt der Schallleitkanal zu einer Verteilung der Hauptströmung des Abgases auf die zumindest zwei Funktionskammern.A Schallleitkanal for connecting the functional chambers may be associated with the exhaust gas inlet according to a development of the invention. Here the Schallleitkanal leads to a distribution of the main flow of the exhaust gas to the at least two functional chambers.

Weiterhin kann nach einer Weiterbildung der Erfindung ein Schallleitkanal zum Verbinden der Funktionskammern dem Abgasaustritt zugeordnet sein. Auch kurz vor dem Austritt des Abgases aus dem Schalldämpfer besteht dadurch noch einmal die Möglichkeit einer Schallwellenausbreitung in beide Kammern hinein. Der dem Abgasaustritt zugeordnete Schallleitkanal kann dabei vorzugsweise eine geringere Weite als der dem Abgaseintritt zugeordnete Schallleitkanal haben. Der dem Abgasaustritt zugeordnete Schallleitkanal dient nicht der Verteilung des einströmenden Abgases, daher kann er kleiner dimensioniert sein. Schallwellen können sich an diesem kleiner dimensionierten Schallleitkanal abbauen, so dass ihre Dämpfung eintritt. Nach einer nächsten Weiterbildung der Erfindung ist vorgesehen, dass der Abgasschalldämpfer als einstückiges Gehäuse hergestellt ist. Der Abgasschalldämpfer besteht aus Gehäusewandungen, diese können einstückig z. B. aus Kunststoff gefertigt sein. Das Einsetzten von Schallschluckstoffen ist nicht erforderlich, so dass insgesamt die Herstellung vereinfacht ist. Der Kunststoff kann unverstärkt sein, beispielsweise wird Polypropylen verwendet.Furthermore, according to a development of the invention, a sound-conducting channel for connecting the functional chambers can be assigned to the exhaust gas outlet. Even shortly before the exit of the exhaust gas from the muffler there is once again the possibility of sound wave propagation into both chambers. The exhaust duct associated with the sound channel may preferably have a smaller width than the exhaust gas inlet associated Schallleitkanal. The exhaust duct associated with the Schallleitkanal does not serve the distribution of the incoming exhaust gas, therefore it may be smaller in size. Sound waves can dissipate at this smaller sized Schallleitkanal, so that their attenuation occurs. According to a next development of the invention it is provided that the exhaust muffler is made as a one-piece housing. The exhaust silencer consists of housing walls, these can be in one piece z. B. be made of plastic. The use of sound-absorbing materials is not required, so that overall production is simplified. The plastic may be unreinforced, for example polypropylene is used.

Der erfindungsgemäße Abgasschalldämpfer kann so angeordnet werden, dass ein Ablauf von Kondensat ermöglicht ist. Es bilden sich dann keine Kondensatblasen. Strömungskanäle können mit Querschnitten ausgerüstet werden, die den Ablauf großer Mengen Wasser ermöglichen, beispielsweise bei Regen, ohne dass der Betrieb des Brenners gestört ist.The exhaust silencer according to the invention can be arranged so that a drain of condensate is possible. It then form no condensate bubbles. Flow channels can be equipped with cross-sections that allow the flow of large amounts of water, such as rain, without the operation of the burner is disturbed.

Der erfindungsgemäße Abgasschalldämpfer hat ein hohes Dämpfungsmaß im Frequenzbereich zwischen 50 Hz und 200 Hz. Dabei nutzt der erfindungsgemäße Abgasschalldämpfer die Funktion der Dämpfung durch Fluid-Struktur-Interaktion, bei der Eigenfrequenzen der Struktur einbezogen werden. Zugleich werden die Grundprinzipien Absorption und Reflexion kombiniert, um bei möglichst kompakter Bauweise ein großes Frequenzspektrum abzudecken und eine hohe Dämpfungsleistung zu erreichen.The exhaust silencer according to the invention has a high attenuation in the frequency range between 50 Hz and 200 Hz. In this case, the exhaust silencer invention uses the function of damping by fluid-structure interaction, are included in the natural frequencies of the structure. At the same time, the basic principles of absorption and reflection are combined in order to cover a large frequency spectrum while being as compact as possible and to achieve a high attenuation performance.

Die Funktionskammern sowie Schalldämpfungskanäle sind nach einer Weiterbildung der Erfindung glattwandig ausgebildet. Sie können dabei mit Rippen oder Sicken versteift werden.The function chambers and sound-damping channels are smooth-walled according to a development of the invention. They can be stiffened with ribs or beads.

Ausführungsbeispiele der Erfindung, aus denen sich weitere erfinderische Merkmale ergeben, sind in der Zeichnung dargestellt. Es zeigen:

  • Figur 1: eine schematische Ansicht eines ersten Ausführungsbeispiels eines erfindungsgemäßen Abgasschalldämpfers und
  • Figur 2: eine Schnittansicht eines zweiten Ausführungsbeispiels eines erfindungsgemäßen Abgasschalldämpfers.
Embodiments of the invention, from which further inventive features result, are shown in the drawing. Show it:
  • FIG. 1 : A schematic view of a first embodiment of an exhaust silencer according to the invention and
  • FIG. 2 a sectional view of a second embodiment of an exhaust muffler according to the invention.

Der Abgasschalldämpfer in den Figuren weist jeweils ein einstückiges Gehäuse 1 auf. Das Gehäuse 1 schließt eine erste Funktionskammer 2 und eine zweite Funktionskammer 3 ein.The exhaust muffler in the figures each has a one-piece housing 1. The housing 1 includes a first functional chamber 2 and a second functional chamber 3.

In einander gegenüberliegenden Abschnitten weist das Gehäuse 1 des Abgasschalldämpfers jeweils einen Abgaseintritt 4 und einen Abgasaustritt 5 auf, die jeweils als Öffnungen ausgebildet sind. Im Bereich des Abgaseintritts 4 sind beide Funktionskammern 2, 3 aneinander gesetzt, zwischen ihnen ist ein breiter Schallleitkanal ausgebildet. Der Weg des Abgases entlang einer Hauptströmung ist in Figur 1 durch Pfeile 6 verdeutlicht. Abgas kann in beide Funktionskammern 2, 3 einströmen.In opposite sections, the housing 1 of the exhaust muffler each have an exhaust gas inlet 4 and an exhaust gas outlet 5, which are each formed as openings. In the area of the exhaust gas inlet 4, both function chambers 2, 3 are placed against each other, between them a wide Schallleitkanal is formed. The path of the exhaust gas along a main flow is in FIG. 1 illustrated by arrows 6. Exhaust gas can flow into both function chambers 2, 3.

Zwischen beiden Funktionskammern 2, 3 ist im Bereich des Abgasaustritts 5 ein weiterer Schallleitkanal ausgebildet, der durch den Doppelpfeil 7 verdeutlicht ist. Dieser in Figur 1 schmalere Schallleitkanal kann beide Funktionskammern 2, 3 miteinander verbinden, er kann aber auch zwischen einer Funktionskammer 2 und dem Abgasaustritt 5 ausgebildet sein.Between the two functional chambers 2, 3, a further sound conducting channel is formed in the region of the exhaust gas outlet 5, which is illustrated by the double arrow 7. This in FIG. 1 narrower Schallleitkanal can connect both functional chambers 2, 3 with each other, but it can also be formed between a functional chamber 2 and the exhaust gas outlet 5.

Claims (8)

Abgasschalldämpfer für eine Abgasleitung, insbesondere für eine aus einem ölbefeuerten Kessel austretende Abgasleitung, mit einer schalldämmenden Funktionskammer, die mit wenigstens einem Abgaseintritt und wenigstens einem Abgasaustritt abgasleitend verbunden ist,
dadurch gekennzeichnet,
dass zumindest eine zweite schalldämmende Funktionskammer (3) vorgesehen ist und beide Funktionskammern (2, 3) über wenigstens einen Schallleitkanal miteinander verbunden sind.Exhaust silencer for an exhaust pipe, in particular for an exhaust pipe emerging from an oil-fired boiler, with a sound-absorbing functional chamber, which is connected to at least one exhaust gas inlet and at least one exhaust gas outlet,
characterized,
in that at least one second sound-absorbing functional chamber (3) is provided and both functional chambers (2, 3) are connected to one another via at least one sound-conducting channel. Abgasschalldämpfer nach Anspruch 1, dadurch gekennzeichnet, dass ein Schallleitkanal zum Verbinden der Funktionskammern (2, 3) dem Abgaseintritt (4) zugeordnet ist.Exhaust silencer according to claim 1, characterized in that a Schallleitkanal for connecting the functional chambers (2, 3) is associated with the exhaust gas inlet (4). Abgasschalldämpfer nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Schallleitkanal zum Verbinden der Funktionskammern (2, 3) dem Abgasaustritt (5) zugeordnet ist.Exhaust silencer according to claim 1 or 2, characterized in that a Schallleitkanal for connecting the functional chambers (2, 3) is associated with the exhaust gas outlet (5). Abgasschalldämpfer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen zumindest einer Funktionskammer (2) und dem Abgasaustritt (5) ein Schallleitkanal ausgebildet ist.Exhaust silencer according to one of the preceding claims, characterized in that between at least one functional chamber (2) and the exhaust gas outlet (5) a Schallleitkanal is formed. Abgasschalldämpfer nach Anspruch 3, dadurch gekennzeichnet, dass der dem Abgasaustritt (5) zugeordnete Schallleitkanal eine geringere Weite als der dem Abgaseintritt (4) zugeordnete Schallleitkanal hat.Exhaust silencer according to claim 3, characterized in that the exhaust gas outlet (5) associated Schallleitkanal has a smaller width than the exhaust gas inlet (4) associated Schallleitkanal. Abgasschalldämpfer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass er als einstückiges Gehäuse (1) hergestellt ist.Exhaust silencer according to one of the preceding claims, characterized in that it is made as a one-piece housing (1). Abgasschalldämpfer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass er aus Kunststoff gefertigt ist.Exhaust silencer according to one of the preceding claims, characterized in that it is made of plastic. Abgasschalldämpfer nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Funktionskammern (2, 3) sowie Schallleitkanäle jeweils glattwandig ausgebildet sind.Exhaust silencer according to one of the preceding claims, characterized in that the functional chambers (2, 3) and sound guide channels are each formed smooth-walled.
EP17169620.6A 2016-05-13 2017-05-05 Exhaust silencer for an exhaust gas conduit, in particular for an exhaust gas conduit exiting from an oil fired boiler Active EP3244130B1 (en)

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Application Number Priority Date Filing Date Title
DE102016108957.5A DE102016108957A1 (en) 2016-05-13 2016-05-13 Exhaust silencer for an exhaust pipe, in particular for an emerging from an oil-fired boiler exhaust pipe

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EP3244130A1 true EP3244130A1 (en) 2017-11-15
EP3244130B1 EP3244130B1 (en) 2020-12-02

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3526609A1 (en) * 1985-07-25 1987-02-05 Leistritz Maschfabrik Paul Exhaust silencer
DE3729219A1 (en) * 1986-09-05 1988-03-10 Volkswagen Ag Exhaust sound (acoustic) damper
DE19818415A1 (en) * 1998-04-24 1999-01-14 Gerd Raichle Reducer for combustion noise for exhaust gas pipe of boiler-burner units
EP1160424A2 (en) * 2000-05-31 2001-12-05 Eaton Aeroquip Inc. Silencer with internal rain diverter
DE102012019318A1 (en) * 2012-10-02 2014-04-03 Mann + Hummel Gmbh Silencer for gas-carrying pipe in internal combustion engine, has primary acoustic portions and secondary acoustic portions which are connected through common connecting elements connected to gas-conducting pipe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE792300A (en) * 1971-12-06 1973-03-30 Safety Vehicles Dev A B EXHAUST NOISE MITIGATION EQUIPMENT
US5052513A (en) * 1986-11-26 1991-10-01 Showa Denko Kabushiki Kaisha Noise reductive resin muffler for exhaust system in combustion engine
DE202009009777U1 (en) * 2009-07-17 2010-12-02 Robert Bosch Gmbh Silencer for a heater
DE102011108059A1 (en) * 2011-07-21 2013-01-24 Mann + Hummel Gmbh Exhaust gas silencer i.e. end muffler, for internal combustion engine of motor car, has housing made of metal material with small heat conductivity, and functional devices made of plastic material and directly connected with housing
US9273641B2 (en) * 2012-08-14 2016-03-01 Volvo Truck Corporation Gas flow unit, a gas treatment device and a combustion engine provided therewith
DE102015110199A1 (en) * 2015-06-25 2016-12-29 Eberspächer Exhaust Technology GmbH & Co. KG exhaust silencer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3526609A1 (en) * 1985-07-25 1987-02-05 Leistritz Maschfabrik Paul Exhaust silencer
DE3729219A1 (en) * 1986-09-05 1988-03-10 Volkswagen Ag Exhaust sound (acoustic) damper
DE19818415A1 (en) * 1998-04-24 1999-01-14 Gerd Raichle Reducer for combustion noise for exhaust gas pipe of boiler-burner units
EP1160424A2 (en) * 2000-05-31 2001-12-05 Eaton Aeroquip Inc. Silencer with internal rain diverter
DE102012019318A1 (en) * 2012-10-02 2014-04-03 Mann + Hummel Gmbh Silencer for gas-carrying pipe in internal combustion engine, has primary acoustic portions and secondary acoustic portions which are connected through common connecting elements connected to gas-conducting pipe

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EP3244130B1 (en) 2020-12-02
DE102016108957A1 (en) 2017-11-16

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