EP3244130B1 - Exhaust silencer for an exhaust gas conduit, in particular for an exhaust gas conduit exiting from an oil fired boiler - Google Patents

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

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Publication number
EP3244130B1
EP3244130B1 EP17169620.6A EP17169620A EP3244130B1 EP 3244130 B1 EP3244130 B1 EP 3244130B1 EP 17169620 A EP17169620 A EP 17169620A EP 3244130 B1 EP3244130 B1 EP 3244130B1
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EP
European Patent Office
Prior art keywords
exhaust gas
exhaust
sound
silencer
gas conduit
Prior art date
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EP17169620.6A
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German (de)
French (fr)
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EP3244130A1 (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 gas silencer for an exhaust gas line, in particular for an exhaust gas line 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.
  • Exhaust silencers of this type are known in mutually different designs.
  • absorption sound absorbers and reflection sound absorbers.
  • the prior art combines both functional principles in separate functional chambers within an exhaust silencer.
  • absorption silencers have at least one absorption chamber filled with sound-absorbing substance, the absorption chamber can be coupled to the exhaust gas flow via a perforated wall.
  • the absorption chamber can be coupled to the exhaust gas flow via a perforated wall.
  • the known exhaust silencers are thus constructed in a complicated manner. So is in the DE 35 26 609 A1 an exhaust silencer with different function chambers is shown. These are connected to one another via a sound duct.
  • the DE 37 29 219 A1 shows a silencer for a Internal combustion engine.
  • One-piece exhaust silencers are in the DE 22 59 539 shown. This document shows the preamble of claim 1.
  • the invention is based on the object of providing an exhaust silencer of the type mentioned at the beginning which, despite a simple structure, is characterized by good sound absorption.
  • the simpler structure should lead to a cost reduction and also to an optimization of the installation space.
  • At least one second sound-absorbing function chamber is provided and both function chambers are connected to one another via at least one sound-conducting channel
  • at least one second sound-absorbing function chamber being provided and both function chambers being connected to one another via at least one sound-conducting channel
  • the exhaust gas silencer being a one-piece Housing and made of plastic
  • the function chambers and sound guide channels are each smooth-walled and a sound guide channel for connecting the function chambers is assigned to the exhaust gas inlet and a sound guide channel for connecting the function chambers is assigned to the exhaust gas outlet and the sound guide channel assigned to the exhaust gas outlet has a smaller width than that Has exhaust gas inlet assigned sound duct.
  • the further function chamber provided according to the invention forms a structure of function chambers which can be matched to the noise to be damped.
  • the functional chambers preferably have no flat surfaces and also no rectangular basic shapes.
  • a sound duct for connecting the functional chambers is assigned to the exhaust gas inlet.
  • the sound guide channel 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 is assigned to the exhaust gas outlet. Even shortly before the exhaust gas exits the silencer, there is once again the possibility of sound waves propagating into both chambers.
  • the sound guide channel assigned to the exhaust gas outlet has a smaller width than the sound guide channel assigned to the exhaust gas inlet.
  • the sound guide channel assigned to the exhaust gas outlet does not serve to distribute the inflowing exhaust gas, so it can be made smaller. Sound waves can break down on this smaller-sized sound-conducting channel, so that their attenuation occurs.
  • the exhaust silencer is made as a one-piece housing.
  • the exhaust silencer consists of housing walls, these are made in one piece from plastic. It is not necessary to use sound-absorbing substances, so that production is simplified overall.
  • the plastic can be unreinforced, for example polypropylene is used.
  • the functional chambers and sound-damping channels are smooth-walled. They can be stiffened with ribs or beads.
  • the exhaust silencer according to the invention can be arranged in such a way that condensate can drain off. No condensate bubbles will then form.
  • Flow channels can be equipped with cross-sections that allow large amounts of water to drain off, for example when it rains, without disrupting the operation of the burner.
  • the exhaust silencer according to the invention has a high degree of damping in the frequency range between 50 Hz and 200 Hz.
  • the exhaust silencer according to the invention uses the function of damping through fluid-structure interaction, in which the natural frequencies of the structure are included.
  • the basic principles of absorption and reflection are combined in order to cover a large frequency spectrum with the most compact design possible and to achieve a high level of attenuation.
  • the exhaust silencer in the figures each has a one-piece housing 1.
  • the housing 1 encloses a first functional chamber 2 and a second functional chamber 3.
  • the housing 1 of the exhaust silencer has an exhaust gas inlet 4 and an exhaust gas outlet 5, which are each designed as openings.
  • both functional chambers 2, 3 are placed next to one another, and a wide sound-conducting channel is formed between them.
  • the path of the exhaust gas along a main flow is in Figure 1 indicated by arrows 6. Exhaust gas can flow into both functional chambers 2, 3.
  • a further sound conducting channel is formed, which is indicated by the double arrow 7 is made clear.
  • the narrower sound-conducting channel can connect the two functional chambers 2, 3 to one another, but it can also be formed between a functional chamber 2 and the exhaust gas outlet 5.

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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)

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 gas silencer for an exhaust gas line, in particular for an exhaust gas line 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.

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 designs. In the prior art, a distinction is made between absorption sound absorbers and reflection sound absorbers. To achieve broadband damping, the prior art combines both functional principles in separate functional chambers within an exhaust silencer.

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 have at least one absorption chamber filled with sound-absorbing substance, the absorption chamber can be coupled to the exhaust gas flow via a perforated wall. With the help of analytical equations, systems are created. B. Helmholtz resonators, chamber silencers and surface resonators are used.

Die bekannten Abgasschalldämpfer sind somit kompliziert aufgebaut. So ist in der DE 35 26 609 A1 ein Abgasschalldämpfer mit verschiedenen Funktionskammern gezeigt. Diese sind über einen Schallleitkanal miteinander verbunden. Die DE 37 29 219 A1 zeigt dagegen einen Schalldämpfer für eine Brennkraftmaschine. Einstückige Abgasschalldämpfer sind in der DE 22 59 539 gezeigt. Dieses Dokument zeigt den Oberbegriff des Anspruchs 1.The known exhaust silencers are thus constructed in a complicated manner. So is in the DE 35 26 609 A1 an exhaust silencer with different function chambers is shown. These are connected to one another via a sound duct. The DE 37 29 219 A1 shows a silencer for a Internal combustion engine. One-piece exhaust silencers are in the DE 22 59 539 shown. This document shows the preamble of claim 1.

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 is based on the object of providing an exhaust silencer of the type mentioned at the beginning which, despite a simple structure, is characterized by good sound absorption. The simpler structure should lead to a cost reduction and also to an optimization of the installation space.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, dass zumindest eine zweite schalldämpfende Funktionskammer vorgesehen ist und beide Funktionskammern über wenigstens einen Schallleitkanal miteinander verbunden sind, wobei zumindest eine zweite schalldämmende Funktionskammer vorgesehen ist und beide Funktionskammern über wenigstens einen Schallleitkanal miteinander verbunden sind, wobei der Abgasschalldämpfer als einstückiges Gehäuse und aus Kunststoff hergestellt ist, die Funktionskammern sowie Schallleitkanäle jeweils glattwandig ausgebildet sind und wobei ein Schallleitkanal zum Verbinden der Funktionskammem dem Abgaseintritt zugeordnet ist und ein Schallleitkanal zum Verbinden der Funktionskammern dem Abgasaustritt zugeordnet ist und der dem Abgasaustritt zugeordnete Schallleitkanal eine geringere Weite als der dem Abgaseintritt zugeordnete Schallleitkanal hat.This object is achieved according to the invention in that at least one second sound-absorbing function chamber is provided and both function chambers are connected to one another via at least one sound-conducting channel, with at least one second sound-absorbing function chamber being provided and both function chambers being connected to one another via at least one sound-conducting channel, the exhaust gas silencer being a one-piece Housing and made of plastic, the function chambers and sound guide channels are each smooth-walled and a sound guide channel for connecting the function chambers is assigned to the exhaust gas inlet and a sound guide channel for connecting the function chambers is assigned to the exhaust gas outlet and the sound guide channel assigned to the exhaust gas outlet has a smaller width than that Has exhaust gas inlet assigned sound duct.

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.The further function chamber provided according to the invention forms a structure of function chambers which can be matched to the noise to be damped. The functional chambers preferably have no flat surfaces and also no rectangular basic shapes. By connecting the functional chambers via at least one sound conducting channel, the frequency band in which the silencer works is advantageously expanded.

Ein Schallleitkanal zum Verbinden der Funktionskammern ist nach der Erfindung dem Abgaseintritt zugeordnet sein. Hier führt der Schallleitkanal zu einer Verteilung der Hauptströmung des Abgases auf die zumindest zwei Funktionskammern.According to the invention, a sound duct for connecting the functional chambers is assigned to the exhaust gas inlet. Here, the sound guide channel leads to a distribution of the main flow of the exhaust gas to the at least two functional chambers.

Weiterhin ist nach 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.Furthermore, according to the invention, a sound conducting channel for connecting the functional chambers is assigned to the exhaust gas outlet. Even shortly before the exhaust gas exits the silencer, there is once again the possibility of sound waves propagating into both chambers.

Der dem Abgasaustritt zugeordnete Schallleitkanal hat dabei erfindungsgemäß 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.According to the invention, the sound guide channel assigned to the exhaust gas outlet has a smaller width than the sound guide channel assigned to the exhaust gas inlet. The sound guide channel assigned to the exhaust gas outlet does not serve to distribute the inflowing exhaust gas, so it can be made smaller. Sound waves can break down on this smaller-sized sound-conducting channel, so that their attenuation occurs.

Nach der Erfindung ist vorgesehen, dass der Abgasschalldämpfer als einstückiges Gehäuse hergestellt ist. Der Abgasschalldämpfer besteht aus Gehäusewandungen, diese sind einstückig 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. Die Funktionskammern sowie Schalldämpfungskanäle sind nach der Erfindung glattwandig ausgebildet. Sie können dabei mit Rippen oder Sicken versteift werden.According to the invention it is provided that the exhaust silencer is made as a one-piece housing. The exhaust silencer consists of housing walls, these are made in one piece from plastic. It is not necessary to use sound-absorbing substances, so that production is simplified overall. The plastic can be unreinforced, for example polypropylene is used. According to the invention, the functional chambers and sound-damping channels are smooth-walled. They can be stiffened with ribs or beads.

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 in such a way that condensate can drain off. No condensate bubbles will then form. Flow channels can be equipped with cross-sections that allow large amounts of water to drain off, for example when it rains, without disrupting the operation of the burner.

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 degree of damping in the frequency range between 50 Hz and 200 Hz. The exhaust silencer according to the invention uses the function of damping through fluid-structure interaction, in which the natural frequencies of the structure are included. At the same time, the basic principles of absorption and reflection are combined in order to cover a large frequency spectrum with the most compact design possible and to achieve a high level of attenuation.

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 emerge, are shown in the drawing. Show it:
Figure 1:
a schematic view of a first embodiment of an exhaust silencer according to the invention and
Figure 2:
a sectional view of a second embodiment of an exhaust silencer 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 silencer in the figures each has a one-piece housing 1. The housing 1 encloses 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 mutually opposite sections, the housing 1 of the exhaust silencer has an exhaust gas inlet 4 and an exhaust gas outlet 5, which are each designed as openings. In the area of the exhaust gas inlet 4, both functional chambers 2, 3 are placed next to one another, and a wide sound-conducting channel is formed between them. The path of the exhaust gas along a main flow is in Figure 1 indicated by arrows 6. Exhaust gas can flow into both functional 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 function chambers 2, 3, in the area of the exhaust gas outlet 5, a further sound conducting channel is formed, which is indicated by the double arrow 7 is made clear. This in Figure 1 The narrower sound-conducting channel can connect the two functional chambers 2, 3 to one another, but it can also be formed between a functional chamber 2 and the exhaust gas outlet 5.

Claims (1)

  1. An exhaust silencer for an exhaust gas conduit, particularly for an exhaust gas conduit exiting an oil-fired boiler, wherein said exhaust silencer comprises a sound-absorbing functional chamber (2) that is connected to at least one exhaust gas inlet (4) and at least one exhaust gas outlet (5) in an exhaust gas-conducting manner, wherein 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 conduction channel, wherein the exhaust silencer is realized in the form of an integral housing (1) and made of plastic, wherein the functional chambers (2, 3) and the sound conduction channels are respectively realized with smooth walls, and wherein one sound conduction channel for connecting the functional chambers (2, 3) is assigned to the exhaust gas inlet (4) and one sound conduction channel for connecting the functional chambers (2, 3) is assigned to the exhaust gas outlet (5), characterized in that the sound conduction channel assigned to the exhaust gas outlet (5) has a smaller width than the sound conduction channel assigned to the exhaust gas inlet (4).
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)

Applications Claiming Priority (1)

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 EP3244130A1 (en) 2017-11-15
EP3244130B1 true 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
DE2259539A1 (en) * 1971-12-06 1973-06-14 Safety Vehicles Develop SILENCER
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
US20150204280A1 (en) * 2012-08-14 2015-07-23 Volvo Truck Corporation Gas flow unit, a gas treatment device and a combustion engine provided therewith

Family Cites Families (6)

* 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
DE3729219C2 (en) * 1986-09-05 2001-08-23 Volkswagen Ag Exhaust silencer
DE19818415C2 (en) * 1998-04-24 2002-11-28 Gerd Raichle Combustion noise reducer for boiler burner units
US6374944B1 (en) * 2000-05-31 2002-04-23 Eaton Corporation 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
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
DE2259539A1 (en) * 1971-12-06 1973-06-14 Safety Vehicles Develop SILENCER
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
US20150204280A1 (en) * 2012-08-14 2015-07-23 Volvo Truck Corporation Gas flow unit, a gas treatment device and a combustion engine provided therewith

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EP3244130A1 (en) 2017-11-15

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