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EP2851526B1 - Exhaust Silencer - Google Patents

Exhaust Silencer Download PDF

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Publication number
EP2851526B1
EP2851526B1 EP14190957.2A EP14190957A EP2851526B1 EP 2851526 B1 EP2851526 B1 EP 2851526B1 EP 14190957 A EP14190957 A EP 14190957A EP 2851526 B1 EP2851526 B1 EP 2851526B1
Authority
EP
European Patent Office
Prior art keywords
housing
perforated
micro
exhaust silencer
silencer according
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
EP14190957.2A
Other languages
German (de)
French (fr)
Other versions
EP2851526A1 (en
Inventor
Bernhard Bachner
Klaus Spindler
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.)
Faurecia Emissions Control Technologies Germany GmbH
Original Assignee
Faurecia Emissions Control Technologies Germany GmbH
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.)
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Publication date
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Priority claimed from DE2003137111 external-priority patent/DE10337111A1/en
Priority claimed from DE2003137110 external-priority patent/DE10337110A1/en
Application filed by Faurecia Emissions Control Technologies Germany GmbH filed Critical Faurecia Emissions Control Technologies Germany GmbH
Priority claimed from EP08000648A external-priority patent/EP1953354A1/en
Publication of EP2851526A1 publication Critical patent/EP2851526A1/en
Application granted granted Critical
Publication of EP2851526B1 publication Critical patent/EP2851526B1/en
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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
    • 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
    • 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
    • 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
    • F01N1/082—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases passing through porous members
    • 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
    • F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
    • 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
    • F01N2470/02—Tubes being perforated
    • 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
    • F01N2470/02—Tubes being perforated
    • F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures

Definitions

  • the present invention relates to an exhaust silencer for the internal combustion engine of a motor vehicle according to the preamble of claim 1.
  • Such a silencer shows the DE 297 10 491 U1 .
  • Exhaust silencers are well known in different versions. Depending on the principle used for sound attenuation, a differentiation is made here between absorption silencers on the one hand and reflection silencers on the other, frequently combining both functional principles in separate chambers within a single exhaust silencer in order to achieve broadband damping.
  • Conventional absorption silencers in this case comprise at least one absorption chamber filled with a fibrous sound-absorbing material, the absorption chamber generally being coupled to the exhaust gas flow via a perforated wall, in particular a perforated pipe.
  • the present invention is directed to an exhaust muffler of the type specified, which, although it has the advantages of conventional absorption muffler in particular with regard to the damping characteristic, manages without fibrous Schallschluckstoff.
  • the silencer according to the invention is free of any fibrous Schallschluckstoff.
  • the present invention takes advantage of the finding that micro-perforated material is suitable for effective sound attenuation in the case of the use of a suitable material under the conditions prevailing in exhaust systems of internal combustion engines, which are characterized in particular by high flow velocities, high pulsations and high temperatures.
  • a micro-perforated flat material in the context of the present invention such a perforated sheet material is considered, the pore size is a maximum of 2.0 mm 2 .
  • Preferred pore sizes are between 0.15 mm 2 and 1.5 mm 2 .
  • the degree of perforation was found to be from 1 to 3% and the equivalent hole diameter from 0.4 to 1.5 mm.
  • the micro-perforated flat material used in the context of the present invention consists of a metallic material, aluminum in particular, namely AL99.5H24, and heat-resistant stainless steel, namely 1.4301 or 1.4828, being considered.
  • the housing at least one radial, between the inside of the housing and the lateral surface of the tube extending intermediate bottom is arranged. The tube with the at least partially perforated wall through the housing.
  • a microperforated flat material with a wall thickness between 0.4 mm and 0.8 mm is particularly preferably used.
  • the microperforated sheet namely such in the form of a microperforated film, to form a multi-layer microperforated wall rests flat against a stiff, perforated support wall and if necessary firmly connected to this.
  • the exhaust silencer according to the invention has at least one intermediate bottom defining two functional chambers, which comprises microperforated flat material. It is particularly advantageous if the respective intermediate floor, with a total thickness of 10 to 20 mm comprises a corrugated or folded microperforated carrier film and two on both sides applied to them microperforated coating films. In this way, limited individual chambers are defined in the space between the two coating films by the corrugated or folded microperforated carrier film, which are coupled by the micro-perforations of the three films to the two adjacent functional chambers.
  • the tube is a corrugated or folded microperforated carrier film and two on both sides applied to this microperforated coating films.
  • the tube should be microperforated essentially over the entire, passing through the housing track and thus sound-absorbing effect over the entire length. At least 90% of the length of the pipe section in the housing is microperforated.
  • the housing extends in accordance with the preferred embodiment substantially concentric with the tube, which has proven to be particularly advantageous.
  • the ratio of the outer diameter of the housing to the outer diameter of the tube, which passes through the housing, is in the range of 2.5 to 4 including, in this context, preferably pipe wall thicknesses between 0.4 to 1.5 mm are provided.
  • At least one radial intermediate space extending between the inside of the housing and the lateral surface of the tube should be arranged in the housing, the ratio of the distance of the end faces of the housing from the distance of the bottom from the end face of the housing closer to 1.8 to 2.2 or from 2.8 to 3.2.
  • the housing at least two spaced-apart radial, are provided between the inner sides of the housing and the lateral surface of the tube extending shelves.
  • the ratio of the distance of the end faces of the housing to the distance of the first intermediate bottom of the nearer end face is in the range of 1.8 to 2.2, and the ratio of the distance of the end faces of the housing to the distance of the second intermediate bottom of the closer him Front side is in the range of 2.8 to 3.2.
  • the ratio of the perforated surface to the total area of the microperforated section Very important for the sound attenuation is the so-called perforation, the ratio of the perforated surface to the total area of the microperforated section.
  • the tube and possibly also the intermediate bottom should have a degree of perforation of 1 to 3%. This ratio has proved to be advantageous.
  • the preferred wall thickness of the tube or shelves in this context should preferably be in the range of 0.4 to 1.5 mm and the equivalent hole diameter between 0.4 and 1.5 mm.
  • At least one functional chamber of the exhaust muffler is lined at least in regions with microperforated flat material.
  • the microperforated flat material can be arranged in particular with a greater or lesser distance from the gas-tight housing wall.
  • At least one functional chamber has a filling of microperforated flat material.
  • the inventive muffler in the frequency range below about 100 Hz compared to conventional absorption mufflers of the same dimensions improved damping behavior.
  • a particularly favorable damping behavior results when the filling of microperforated flat material comprises a plurality of mutually substantially parallel, spaced-apart layers. The distance between the two individual layers of the filling is on the order of between 12 times and 80 times, ideally between 15 times and 40 times the thickness of the microperforated sheet.
  • such a filling, depending on the installation conditions, of a continuous strip of microperforated sheet wound or folded in this case, particularly low production costs arise.
  • the tubes of microperforated sheet material can in particular surround an inner, exhaust-carrying, perforated tube.
  • the damping behavior of the exhaust muffler according to the invention can also be favorably influenced if the microperforated flat material has pores of different shapes and / or different sizes; this contributes to a particularly broadband damping, which makes the exhaust muffler according to the present invention particularly superior to such absorption mufflers according to the prior art.
  • Suitable pore forms include circles, segments, ovals, trapezoids, slits and the like. With regard to the pore sizes, widths of between 0.05 mm and 0.15 mm and lengths of between 0.5 mm and 1.5 mm have proven to be particularly favorable for non-round pores.
  • the in Fig. 1 illustrated muffler comprises a tube 1 and a cylindrical housing 2, which in turn consists of two end floors 3 and 4 and a jacket 5.
  • the housing 2 concentric tube I comprises a
  • the exhaust gas pipe I is coupled to the functional chamber 10, which surrounds the central portion 8 of the exhaust pipe I and by this, the two end floors 3 and 4 and the jacket 5 of the housing is limited.
  • an insert 11 is arranged in the chamber 10. This consists of two concentric spaced-apart tubes 12 and 13 of a microperforated film.
  • the tube 1 in the area within the housing and the tubes 12, 13 may, for. B. be formed from a wound or folded strip of microperforated sheet.
  • the in Fig. 2 illustrated exhaust muffler comprises a housing 14, an exhaust gas inlet pipe 15 and an exhaust gas outlet pipe 16.
  • the interior of the housing 14 is divided by three intermediate floors 17, 18 and 19 in four chambers 20, 21, 22 and 23.
  • the exhaust gas inlet pipe 15 opens into the chamber 23 designed as a Helmholtz chamber. It is also coupled to the chamber 23 via a perforation 24 or a microperforated section.
  • the exhaust gas outlet pipe 16 opens into the chamber 21; via the perforation 25 or the microperforated section, it is further acoustically coupled to the chamber 22.
  • the intermediate floors 17 and 18 are, as illustrated in the detail view, each assembled from three microperforated films by applying microperforated coating films 27 and 28 on both sides to a zigzag-folded, microperforated carrier film 26.
  • a unit comprising a zigzag-folded or corrugated carrier film and a coating film applied thereto may be otherwise As can be deduced from the above explanations, also for lining the housing and / or for application to pipes, eg. As the tubes 1, 12, 13, 15, 16, and / or use gas-impermeable intermediate floors.
  • FIG. 3 an exhaust muffler in the form of a concentric tube resonator.
  • the tube 1 is microperforated over almost the entire distance in the interior of the housing 2 on the entire outer circumference.
  • the microperforated portion of the tube 1 in the interior of the housing 2 is at least 90% of the distance I of the end faces 31, 32 of the housing 2.
  • Inside the housing 2 are two spaced apart, radially extending and between the inside of the housing 2 and the outside the lateral surface of the tube 1 extending shelves 33, 34 are provided. These shelves 33, 34 are fastened on the one hand to the housing 2 and on the other hand to the tube 1. If necessary, the tube 1 has no microperforations in the region of the connection of the intermediate floors 33, 34.
  • the ratio of the distance I of the two end faces 31, 32 to the distance I 1 of the intermediate bottom 33 from the end face 31 which is close to it should be in the range from 1.8 to 2.2.
  • the distance I of the end faces 31, 32 in relation to the distance I 2 of the intermediate wall 34 to the end face 32 should be in the range of 2.8 to 3.2.
  • the ratio of the outer diameter d a of the housing 2 to the outer diameter d i of the tube 1 in the region inside the housing 2 should be in the range of 2.5 to 4.
  • the wall thicknesses of the pipe and the shelves should be in the range of 0.4 to 1.5 mm, the degree of perforation in the range of 1 to 3%. These conditions are, as I said, particularly advantageous.
  • the equivalent hole diameter is in the range of 0.4 to 1.5 mm.
  • the microperforations usually do not give circular but slit or sickle-shaped holes in the wall. The cross-sectional area of these non-circular holes is converted to an equivalent hole diameter.
  • the intermediate floors 33, 34 may be made of microperforated sheet material, similar to FIG. 2 but you do not have to. Even intermediate floors without throughflow already achieve relatively good sound absorption values.
  • the tube 1 in the area inside the housing consists e.g. made of wound flat material, whereby a multiple winding is possible.
  • the microperforated part of the tube 1 may be welded to a non-perforated tube section which protrudes from the housing 2.
  • the shelves 33, 34 may e.g. be attached by crimping or other plastic deformation of the tube 1 and / or the housing 2.
  • a welding or radial clamping connection is of course conceivable.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Exhaust Silencers (AREA)

Description

Die vorliegende Erfindung betrifft einen Abgasschalldämpfer für den Verbrennungsmotor eines Kraftfahrzeugs nach dem Oberbegriff des Anspruchs 1.The present invention relates to an exhaust silencer for the internal combustion engine of a motor vehicle according to the preamble of claim 1.

Einen derartigen Schalldämpfer zeigt die DE 297 10 491 U1 .Such a silencer shows the DE 297 10 491 U1 ,

Abgasschalldämpfer sind in unterschiedlichen Ausführungen allgemein bekannt. In Abhängigkeit von dem zur Schalldämpfung eingesetzten Prinzip wird dabei zwischen Absorptionsschalldämpfern einerseits und Reflexionsschalldämpfern andererseits unterschieden, wobei häufig zur Erreichung einer breitbandigen Dämpfung beide Funktionsprinzipien in getrennten Kammern innerhalb eines einzigen Abgasschalldämpfers vereinigt sind. Herkömmliche Absorptionsschalldämpfer umfassen dabei mindestens eine mit einem faserförmigen Schallschluckstoff gefüllte Absorptionskammer, wobei die Absorptionskammer im allgemeinen über eine gelochte Wand, insbesondere ein gelochtes Rohr an den Abgasstrom angekoppelt ist.Exhaust silencers are well known in different versions. Depending on the principle used for sound attenuation, a differentiation is made here between absorption silencers on the one hand and reflection silencers on the other, frequently combining both functional principles in separate chambers within a single exhaust silencer in order to achieve broadband damping. Conventional absorption silencers in this case comprise at least one absorption chamber filled with a fibrous sound-absorbing material, the absorption chamber generally being coupled to the exhaust gas flow via a perforated wall, in particular a perforated pipe.

Die vorliegende Erfindung ist gerichtet auf einen Abgasschalldämpfer der eingangs angegebenen Art, der, obwohl er die Vorteile herkömmlicher Absorptionsschalldämpfer insbesondere im Hinblick auf die Dämpfungscharakteristik aufweist, ohne faserförmigen Schallschluckstoff auskommt.The present invention is directed to an exhaust muffler of the type specified, which, although it has the advantages of conventional absorption muffler in particular with regard to the damping characteristic, manages without fibrous Schallschluckstoff.

Gelöst wird diese Aufgabe gemäß der vorliegenden Erfindung bei einem Abgasschalldämpfer nach Anspruch 1. Der erfindungsgemäße Schalldämpfer ist frei von jeglichem faserförmigem Schallschluckstoff. Die vorliegende Erfindung macht sich die Erkenntnis zunutze, daß mikroperforiertes Material im Falle der Verwendung eines geeigneten Werkstoffs unter den in Abgasanlagen von Verbrennungsmotoren herrschenden Bedingungen, die insbesondere gekennzeichnet sind durch hohe Strömungsgeschwindigkeiten, starke Pulsationen und hohe Temperaturen zur wirksamen Schalldämpfung geeignet ist. Als mikroperforiertes Flachmaterial im Sinne der vorliegenden Erfindung wird dabei ein solches perforiertes Flachmaterial angesehen, dessen Porengröße maximal 2,0 mm2 beträgt. Bevorzugte Porengrößen liegen zwischen 0,15 mm2 und 1,5 mm2. Der Perforationsgrad (Verhältnis gelochte Fläche/Gesamtfläche) sollte, wie sich ergeben hat, von 1 bis 3 % und der äquivalente Lochdurchmesser von 0,4 bis 1,5 mm betragen. Damit kann das im Rahmen der vorliegenden Erfindung eingesetzte mikroperforierte Flachmaterial, abgesehen von dem Werkstoff, im wesentlichen den als solches im Zusammenhang mit anderen Anwendungen bekannten mikroperforierten Flachmaterialien, insbesondere sogenannten mikroperforierten Folien, entsprechen. Allerdings besteht das im Rahmen der vorliegenden Erfindung eingesetzte mikroperforierte Flachmaterial aus einem metallischen Werkstoff, wobei insbesondere Aluminium, namentlich AL99.5H24, und hitzebeständiger Edelstahl, namentlich 1.4301 oder 1.4828, in Betracht kommen. Im Gehäuse ist wenigstens ein radialer, sich zwischen der Innenseite des Gehäuses und der Mantelfläche des Rohres erstreckender Zwischenboden angeordnet. Das Rohr mit der wenigstens abschnittsweisen perforierten Wand durch das Gehäuse hindurch.This problem is solved according to the present invention in an exhaust silencer according to claim 1. The silencer according to the invention is free of any fibrous Schallschluckstoff. The present invention takes advantage of the finding that micro-perforated material is suitable for effective sound attenuation in the case of the use of a suitable material under the conditions prevailing in exhaust systems of internal combustion engines, which are characterized in particular by high flow velocities, high pulsations and high temperatures. As a micro-perforated flat material in the context of the present invention, such a perforated sheet material is considered, the pore size is a maximum of 2.0 mm 2 . Preferred pore sizes are between 0.15 mm 2 and 1.5 mm 2 . The degree of perforation (perforated area / total area ratio) was found to be from 1 to 3% and the equivalent hole diameter from 0.4 to 1.5 mm. Thus, in the context of the present invention used micro-perforated flat material, apart from the material in the essentially correspond to the known as such in connection with other applications microperforated sheet materials, in particular so-called micro-perforated films. However, the micro-perforated flat material used in the context of the present invention consists of a metallic material, aluminum in particular, namely AL99.5H24, and heat-resistant stainless steel, namely 1.4301 or 1.4828, being considered. In the housing, at least one radial, between the inside of the housing and the lateral surface of the tube extending intermediate bottom is arranged. The tube with the at least partially perforated wall through the housing.

Besonders bevorzugt kommt im Rahmen der vorliegenden Erfindung als mikroperforiertes Flachmaterial eine mikroperforierte Folie mit einer Wandstärke zwischen 0,4 mm und 0,8 mm zum Einsatz. Je nach der Ausdehnung des mikroperforierten Flachmaterials und den Druckverhältnissen, denen dieses ausgesetzt ist, ist es dabei besonders zweckmäßig, wenn das mikroperforierte Flachmaterial, namentlich solches in Form einer mikroperforierten Folie, zur Bildung einer mehrlagig aufgebauten mikroperforierten Wand flächig an einer steifen, gelochten Stützwand anliegt und ggf. fest mit dieser verbunden ist.Within the scope of the present invention, a microperforated flat material with a wall thickness between 0.4 mm and 0.8 mm is particularly preferably used. Depending on the extent of the microperforated sheet material and the pressure ratios to which it is exposed, it is particularly useful if the microperforated sheet, namely such in the form of a microperforated film, to form a multi-layer microperforated wall rests flat against a stiff, perforated support wall and if necessary firmly connected to this.

Im Hinblick auf die spezifische Anordnung des mikroperforierten Flachmaterials innerhalb des Abgasschalldämpfers haben sich mehrere Möglichkeiten als besonders günstig herausgestellt, die innerhalb eines Abgasschalldämpfers auch miteinander kombiniert werden können. Gemäß einer insoweit besonders bevorzugten ersten Weiterbildung weist der erfindungsgemäße Abgasschalldämpfer mindestens einen zwei Funktionskammern definierenden Zwischenboden auf, welcher mikroperforiertes Flachmaterial umfaßt. Besonders günstig ist dabei, wenn der betreffende Zwischenboden, bei einer gesamten Dicke von 10 bis 20 mm eine gewellte oder gefaltete mikroperforierte Trägerfolie und zwei beiderseits auf diese aufgebrachte mikroperforierte Beschichtungsfolien umfaßt. Auf diese Weise werden in dem Raum zwischen den beiden Beschichtungsfolien durch die gewellte oder gefaltete mikroperforierte Trägerfolie begrenzte einzelne Kammern definiert, welche durch die Mikroperforationen der drei Folien an die beiden benachbarten Funktionskammern angekoppelt sind.With regard to the specific arrangement of the microperforated flat material within the exhaust muffler, several options have proven to be particularly favorable, which can also be combined with each other within an exhaust muffler. According to a particularly preferred first development, the exhaust silencer according to the invention has at least one intermediate bottom defining two functional chambers, which comprises microperforated flat material. It is particularly advantageous if the respective intermediate floor, with a total thickness of 10 to 20 mm comprises a corrugated or folded microperforated carrier film and two on both sides applied to them microperforated coating films. In this way, limited individual chambers are defined in the space between the two coating films by the corrugated or folded microperforated carrier film, which are coupled by the micro-perforations of the three films to the two adjacent functional chambers.

Gemäß einer anderen bevorzugten Weiterbildung kann, was sich wiederum als besonders günstig herausgestellt hat, das Rohr eine gewellte oder gefaltete mikroperforierte Trägerfolie und zwei beiderseits auf diese aufgebrachte mikroperforierte Beschichtungsfolien umfassen.According to another preferred development, which in turn has proven to be particularly favorable, the tube is a corrugated or folded microperforated carrier film and two on both sides applied to this microperforated coating films.

Dabei sollte das Rohr im Wesentlichen über die gesamte, durch das Gehäuse hindurchlaufende Strecke mikroperforiert sein und damit auch über die gesamte Länge schalldämpfend wirken. Zumindest 90% der Länge des sich im Gehäuse befindlichen Rohrabschnitts ist mikroperforiert.In this case, the tube should be microperforated essentially over the entire, passing through the housing track and thus sound-absorbing effect over the entire length. At least 90% of the length of the pipe section in the housing is microperforated.

Das Gehäuse verläuft gemäß der bevorzugten Ausführungsform im wesentlichen konzentrisch zum Rohr, was sich als besonders vorteilhaft erwiesen hat.The housing extends in accordance with the preferred embodiment substantially concentric with the tube, which has proven to be particularly advantageous.

Das Verhältnis des Außendurchmessers des Gehäuses zum Außendurchmesser des Rohres, welches durch das Gehäuse hindurchläuft, liegt im Bereich von 2,5 bis einschließlich 4, wobei in diesem Zusammenhang bevorzugt Rohrwandstärken zwischen 0,4 bis 1,5 mm vorgesehen sind.The ratio of the outer diameter of the housing to the outer diameter of the tube, which passes through the housing, is in the range of 2.5 to 4 including, in this context, preferably pipe wall thicknesses between 0.4 to 1.5 mm are provided.

Im Gehäuse sollte darüber hinaus wenigstens ein radialer, sich zwischen der Innenseite des Gehäuses und der Mantelfläche des Rohres erstreckender Zwischenboden angeordnet sein, wobei das Verhältnis des Abstandes der Stirnseiten des Gehäuses zu dem Abstand des Bodens von der ihm näheren Stirnseite des Gehäuses von 1,8 bis 2,2 oder von 2,8 bis 3,2 beträgt.In addition, at least one radial intermediate space extending between the inside of the housing and the lateral surface of the tube should be arranged in the housing, the ratio of the distance of the end faces of the housing from the distance of the bottom from the end face of the housing closer to 1.8 to 2.2 or from 2.8 to 3.2.

In der bevorzugten Ausführungsform ist jedoch vorgesehen, daß im Gehäuse wenigstens zwei voneinander beabstandete radiale, sich zwischen den Innenseiten des Gehäuses und der Mantelfläche des Rohres erstreckende Zwischenböden vorgesehen sind. Das Verhältnis des Abstandes der Stirnseiten des Gehäuses zu dem Abstand des ersten Zwischenbodens von der ihm näheren Stirnseite liegt im Bereich von 1,8 bis 2,2, und das Verhältnis des Abstandes der Stirnseiten des Gehäuses zu dem Abstand des zweiten Zwischenbodens von der ihm näheren Stirnseite liegt im Bereich von 2,8 bis 3,2. Diese Verhältnisse haben sich bei einem sogenannten konzentrischen Rohrresonator als besonders schalldämpfend und vorteilhaft erwiesen. Die Zwischenböden können mit oder ohne Mikroperforationen versehen sein.In the preferred embodiment, however, it is provided that in the housing at least two spaced-apart radial, are provided between the inner sides of the housing and the lateral surface of the tube extending shelves. The ratio of the distance of the end faces of the housing to the distance of the first intermediate bottom of the nearer end face is in the range of 1.8 to 2.2, and the ratio of the distance of the end faces of the housing to the distance of the second intermediate bottom of the closer him Front side is in the range of 2.8 to 3.2. These conditions have proven to be particularly sound-damping and advantageous in a so-called concentric tube resonator. The shelves can be provided with or without microperforations.

Sehr wichtig für die Schalldämpfung ist der sogenannte Perforationsgrad, das Verhältnis der gelochten Fläche zur Gesamtfläche des mikroperforierten Abschnittes. Das Rohr und gegebenenfalls auch der Zwischenboden sollten einen Perforationsgrad von 1 bis 3 % aufweisen. Auch dieses Verhältnis hat sich als vorteilhaft erwiesen.Very important for the sound attenuation is the so-called perforation, the ratio of the perforated surface to the total area of the microperforated section. The tube and possibly also the intermediate bottom should have a degree of perforation of 1 to 3%. This ratio has proved to be advantageous.

Die bevorzugte Wandstärke des Rohres oder der Zwischenböden sollte in diesem Zusammenhang vorzugsweise im Bereich von 0,4 bis 1,5 mm und der äquivalente Lochdurchmesser zwischen 0,4 und 1,5 mm liegen.The preferred wall thickness of the tube or shelves in this context should preferably be in the range of 0.4 to 1.5 mm and the equivalent hole diameter between 0.4 and 1.5 mm.

Gemäß einer weiteren bevorzugten Weiterbildung der Erfindung ist mindestens eine Funktionskammer des Abgasschalldämpfers zumindest bereichsweise mit mikroperforiertem Flachmaterial ausgekleidet. Das mikroperforierte Flachmaterial kann dabei insbesondere mit einem mehr oder weniger großen Abstand zu der gasdichten Gehäusewand angeordnet sein.According to a further preferred development of the invention, at least one functional chamber of the exhaust muffler is lined at least in regions with microperforated flat material. The microperforated flat material can be arranged in particular with a greater or lesser distance from the gas-tight housing wall.

Gemäß einer wiederum anderen bevorzugten Weiterbildung der Erfindung weist mindestens eine Funktionskammer eine Füllung aus mikroperforiertem Flachmaterial auf. Namentlich in diesem Falle läßt sich mit dem erfindungsgemäßen Schalldämpfer in dem Frequenzbereich unter etwa 100 Hz ein gegenüber herkömmlichen Absorptionsschalldämpfern gleicher Abmessungen verbessertes Dampfungsverhalten erreichen. Ein besonders günstiges Dämpfungsverhalten ergibt sich dabei, wenn die Füllung aus mikroperforiertem Flachmaterial mehrere zueinander im wesentlichen parallele, mit Abstand zueinander angeordnete Schichten umfaßt. Dabei beträgt der Abstand zwischen den beiden einzelnen Schichten der Füllung in der Größenordnung zwischen dem 12fachen und dem 80fachen, idealerweise zwischen dem 15fachen und dem 40fachen Wert der Dicke des mikroperforierten Flachmaterials.According to yet another preferred development of the invention, at least one functional chamber has a filling of microperforated flat material. In particular, in this case can be achieved with the inventive muffler in the frequency range below about 100 Hz compared to conventional absorption mufflers of the same dimensions improved damping behavior. A particularly favorable damping behavior results when the filling of microperforated flat material comprises a plurality of mutually substantially parallel, spaced-apart layers. The distance between the two individual layers of the filling is on the order of between 12 times and 80 times, ideally between 15 times and 40 times the thickness of the microperforated sheet.

Gemäß einem weiteren Aspekt der vorliegenden Erfindung kann eine solche Füllung, je nach den Einbauverhältnissen, aus einem durchgehenden Streifen aus mikroperforiertem Flachmaterial gewickelt oder aber gefaltet sein. In diesem Fall ergeben sich besonders geringe Herstellungskosten. Indessen ist auch denkbar, eine solche mehrere zueinander im wesentlichen parallele Schichten umfassende Füllung aus mehreren im wesentlichen zueinander konzentrischen, einen beliebigen Querschnitt aufweisenden Rohren aus mikroperforiertem Flachmaterial herzustellen, wobei die Rohre aus mikroperforiertem Flachmaterial insbesondere ein inneres, abgasführendes, gelochtes Rohr umgeben können.According to a further aspect of the present invention, such a filling, depending on the installation conditions, of a continuous strip of microperforated sheet wound or folded. In this case, particularly low production costs arise. However, it is also conceivable to produce such a plurality of substantially mutually substantially parallel layers comprising filling a plurality of substantially concentric, any cross-section having tubes of microperforated sheet material, the tubes of microperforated sheet material can in particular surround an inner, exhaust-carrying, perforated tube.

Das Dämpfungsverhalten des erfindungsgemäßen Abgasschalldämpfers läßt sich weiterhin günstig beeinflussen, wenn das mikroperforierte Flachmaterial Poren unterschiedlicher Formen und/oder unterschiedlicher Größen aufweist; dies trägt zu einer besonders breitbandigen Dämpfung bei, die die Abgasschalldämpfer nach der vorliegenden Erfindung gegenüber solchen Absorptionsschalldämpfern nach dem Stand der Technik besonders überlegen macht.The damping behavior of the exhaust muffler according to the invention can also be favorably influenced if the microperforated flat material has pores of different shapes and / or different sizes; this contributes to a particularly broadband damping, which makes the exhaust muffler according to the present invention particularly superior to such absorption mufflers according to the prior art.

Geeignete Porenformen umfassen dabei Kreise, Kreisabschnitte, Ovale, Trapeze, Schlitze und dergleichen. Im Hinblick auf die Porengrößen haben sich bei unrunden Poren Breiten zwischen 0,05 mm und 0,15 mm und Längen zwischen 0,5 mm und 1,5 mm als besonders günstig erwiesen .Suitable pore forms include circles, segments, ovals, trapezoids, slits and the like. With regard to the pore sizes, widths of between 0.05 mm and 0.15 mm and lengths of between 0.5 mm and 1.5 mm have proven to be particularly favorable for non-round pores.

Im folgenden wird die vorliegende Erfindung anhand dreier in der Zeichnung veranschaulichter bevorzugter Ausführungsbeispiele näher erläutert. Dabei zeigt

  • Fig. 1 einen Längsschnitt durch einen Abgasschalldämpfer, der nicht unter die vorliegende Erfindung fällt, aber der Erläuterung dient,
  • Fig. 2 einen Längsschnitt durch einen Vier-Kammer-Abgasschalldämpfer nach der vorliegenden Erfindung und
  • Fig. 3 einen Längsschnitt durch einen erfindungsgemäßen Abgasschalldämpfer in Form eines konzentrischen Rohrresonators.
In the following, the present invention will be explained in more detail with reference to three illustrated in the drawing preferred embodiments. It shows
  • Fig. 1 a longitudinal section through an exhaust muffler, which does not fall under the present invention, but the explanation serves,
  • Fig. 2 a longitudinal section through a four-chamber exhaust muffler according to the present invention and
  • Fig. 3 a longitudinal section through an exhaust muffler according to the invention in the form of a concentric tube resonator.

Der in Fig. 1 veranschaulichte Schalldämpfer umfaßt ein Rohr 1 und ein zylindrisches Gehäuse 2, welches seinerseits aus zwei Endböden 3 und 4 sowie einem Mantel 5 besteht. Das zum Gehäuse 2 konzentrische Rohr I umfaßt einenThe in Fig. 1 illustrated muffler comprises a tube 1 and a cylindrical housing 2, which in turn consists of two end floors 3 and 4 and a jacket 5. The housing 2 concentric tube I comprises a

Abgaseintrittsstutzen 6, einen Abgasaustrittsstutzen 7 sowie, zwischen den beiden Endböden 3 und 4 angeordnet, einen gelochten, vorzugsweise mikroperforierten Mittelabschnitt 8. Über die Lochung 9 ist das abgasführende Rohr I an die Funktionskammer 10 angekoppelt, welche den Mittelabschnitt 8 des abgasführenden Rohres I umgibt und durch dieses, die beiden Endböden 3 und 4 sowie den Mantel 5 des Gehäuses begrenzt wird.Exhaust gas inlet pipe 6, an exhaust gas outlet nozzle 7 and, arranged between the two end floors 3 and 4, a perforated, preferably microperforated middle section 8. About the perforation 9, the exhaust gas pipe I is coupled to the functional chamber 10, which surrounds the central portion 8 of the exhaust pipe I and by this, the two end floors 3 and 4 and the jacket 5 of the housing is limited.

In der Kammer 10 ist ein Einsatz 11 angeordnet. Dieser besteht aus zwei konzentrisch mit Abstand zueinander angeordneten Rohren 12 und 13 aus einer mikroperforierten Folie. Das Rohr 1 im Bereich innerhalb des Gehäuses und die Rohre 12, 13 können z. B. aus einem gewickelten oder gefalteten Streifen aus mikroperforiertem Flachmaterial gebildet sein.In the chamber 10, an insert 11 is arranged. This consists of two concentric spaced-apart tubes 12 and 13 of a microperforated film. The tube 1 in the area within the housing and the tubes 12, 13 may, for. B. be formed from a wound or folded strip of microperforated sheet.

Der in Fig. 2 veranschaulichte Abgasschalldämpfer umfaßt ein Gehäuse 14, ein Abgaseintrittsrohr 15 und ein Abgasaustrittsrohr 16. Das Innere des Gehäuses 14 ist durch drei Zwischenböden 17, 18 und 19 in vier Kammern 20, 21, 22 und 23 unterteilt. Das Abgaseintrittsrohr 15 mündet in die als Helmholtz-Kammer ausgeführte Kammer 23. Es ist über eine Lochung 24 oder einen mikroperforierten Abschnitt des Weiteren an die Kammer 23 angekoppelt. Das Abgasaustrittsrohr 16 mündet in der Kammer 21; über die Lochung 25 oder den mikroperforierten Abschnitt ist es des weiteren an die Kammer 22 akustisch angekoppelt.The in Fig. 2 illustrated exhaust muffler comprises a housing 14, an exhaust gas inlet pipe 15 and an exhaust gas outlet pipe 16. The interior of the housing 14 is divided by three intermediate floors 17, 18 and 19 in four chambers 20, 21, 22 and 23. The exhaust gas inlet pipe 15 opens into the chamber 23 designed as a Helmholtz chamber. It is also coupled to the chamber 23 via a perforation 24 or a microperforated section. The exhaust gas outlet pipe 16 opens into the chamber 21; via the perforation 25 or the microperforated section, it is further acoustically coupled to the chamber 22.

Die Zwischenböden 17 und 18 sind, wie in der Detailansicht veranschaulicht, jeweils aus drei mikroperforierten Folien zusammengefügt, indem beiderseits auf eine zickzackförmig gefaltete, mikroperforierte Trägerfolie 26 mikroperforierte Beschichtungsfolien 27 und 28 aufgebracht sind.The intermediate floors 17 and 18 are, as illustrated in the detail view, each assembled from three microperforated films by applying microperforated coating films 27 and 28 on both sides to a zigzag-folded, microperforated carrier film 26.

Während bei der veranschaulichten Ausführung durch eine gleichmäßige Gestaltung der Trägerfolie 26 übereinstimmend dimensionierte Kammern 29 innerhalb der Zwischenböden 17 und 18 entstehen, ergeben sich bei einer ungleichförmigen Faltung der Trägerfolie 26 Kammern 29 mit unterschiedlichem Volumen, was unter bestimmten Umständen günstig sein kann. Auch kann der in Fig. 2 veranschaulichte Abgasschalldämpfer beispielsweise dergestalt modifiziert werden, daß die Zwischenböden weitere mikroperforierte Folien umfassen, beispielsweise eine weitere gefaltete und eine weitere ebene Trägerfolie.While 26 in the illustrated embodiment by a uniform design of the carrier film consistently dimensioned chambers 29 within the shelves 17 and 18, resulting in a non-uniform folding of the support film 26 chambers 29 with different volumes, which may be beneficial under certain circumstances. Also, the in Fig. 2 illustrated exhaust muffler be modified, for example, such that the intermediate floors comprise further microperforated films, for example, another folded and another flat carrier film.

Eine Einheit umfassend eine zickzackförmig gefaltete oder aber gewellte Trägerfolie und eine hierauf aufgebrachte Beschichtungsfolie läßt sich im übrigen, wie sich aus den vorstehenden Erläuterungen ableiten läßt, auch zur Auskleidung des Gehäuses und/oder zur Aufbringung auf Rohre, z. B. die Rohre 1, 12, 13, 15, 16, und/oder gasundurchlässige Zwischenböden einsetzen.A unit comprising a zigzag-folded or corrugated carrier film and a coating film applied thereto may be otherwise As can be deduced from the above explanations, also for lining the housing and / or for application to pipes, eg. As the tubes 1, 12, 13, 15, 16, and / or use gas-impermeable intermediate floors.

In Figur 3 ist ein Abgasschalldämpfer in Form eines konzentrischen Rohrresonators dargestellt. Durch das zylindrische Gehäuse 2 läuft ein konzentrisch hierzu angeordnetes Rohr 1. Das Rohr 1 ist über fast die gesamte Strecke im Inneren des Gehäuses 2 auf dem gesamten Außenumfang mikroperforiert. Der mikroperforierte Abschnitt des Rohres 1 im Inneren des Gehäuses 2 beträgt wenigstens 90 % des Abstandes I der Stirnseiten 31, 32 des Gehäuses 2. Im Inneren des Gehäuses 2 sind zwei voneinander beabstandete, radial verlaufende und sich zwischen der Innenseite des Gehäuses 2 und der Außenseite der Mantelfläche des Rohres 1 erstreckende Zwischenböden 33, 34 vorgesehen. Diese Zwischenböden 33, 34 sind einerseits am Gehäuse 2 und andererseits am Rohr 1 befestigt. Das Rohr 1 hat gegebenenfalls im Bereich der Anbindung der Zwischenböden 33, 34 keine Mikroperforationen.In FIG. 3 is shown an exhaust muffler in the form of a concentric tube resonator. Through the cylindrical housing 2 runs a concentrically arranged thereto tube 1. The tube 1 is microperforated over almost the entire distance in the interior of the housing 2 on the entire outer circumference. The microperforated portion of the tube 1 in the interior of the housing 2 is at least 90% of the distance I of the end faces 31, 32 of the housing 2. Inside the housing 2 are two spaced apart, radially extending and between the inside of the housing 2 and the outside the lateral surface of the tube 1 extending shelves 33, 34 are provided. These shelves 33, 34 are fastened on the one hand to the housing 2 and on the other hand to the tube 1. If necessary, the tube 1 has no microperforations in the region of the connection of the intermediate floors 33, 34.

Wie sich heraus gestellt hat, gibt es bestimmte Verhältnisse der Abstände der Zwischenböden von den ihnen nahen Stirnseiten 31, 32, die für ein besonders gutes Schalldämpfungsverhalten sorgen. Das Verhältnis des Abstandes I der beiden Stirnseiten 31, 32 zum Abstand I1 des Zwischenbodens 33 von der ihm nahen Stirnseite 31 sollte im Bereich von 1,8 bis 2,2 liegen.As it turns out, there are certain ratios of the distances between the shelves of the near them end faces 31, 32, which provide a particularly good sound attenuation behavior. The ratio of the distance I of the two end faces 31, 32 to the distance I 1 of the intermediate bottom 33 from the end face 31 which is close to it should be in the range from 1.8 to 2.2.

Der Abstand I der Stirnseiten 31, 32 im Verhältnis zum Abstand I2 von der Zwischenwand 34 zur Stirnseite 32 sollte im Bereich von 2,8 bis 3,2 liegen.The distance I of the end faces 31, 32 in relation to the distance I 2 of the intermediate wall 34 to the end face 32 should be in the range of 2.8 to 3.2.

Das Verhältnis des Außendurchmessers da des Gehäuses 2 zum Außendurchmesser di des Rohres 1 im Bereich innerhalb des Gehäuses 2 sollte im Bereich von 2,5 bis 4 liegen.The ratio of the outer diameter d a of the housing 2 to the outer diameter d i of the tube 1 in the region inside the housing 2 should be in the range of 2.5 to 4.

Die Wandstärken des Rohres und der Zwischenböden sollten im Bereich von 0,4 bis 1,5 mm liegen, der Perforationsgrad im Bereich von 1 bis 3 %. Diese Verhältnisse sind, wie gesagt, besonders vorteilhaft.The wall thicknesses of the pipe and the shelves should be in the range of 0.4 to 1.5 mm, the degree of perforation in the range of 1 to 3%. These conditions are, as I said, particularly advantageous.

Der äquivalente Lochdurchmesser liegt im Bereich von 0,4 bis 1,5 mm. Die Mikroperforationen ergeben üblicherweise keine kreisrunden, sondern schlitz- oder sichelförmige Löcher in der Wand. Die Querschnittsfläche dieser vom Kreis abweichenden Löcher wird auf einen äquivalenten Lochdurchmesser umgerechnet.The equivalent hole diameter is in the range of 0.4 to 1.5 mm. The microperforations usually do not give circular but slit or sickle-shaped holes in the wall. The cross-sectional area of these non-circular holes is converted to an equivalent hole diameter.

Die Zwischenböden 33, 34 können aus mikroperforiertem Flachmaterial sein, ähnlich wie in Figur 2 gezeigt, sie müssen es jedoch nicht. Auch Zwischenböden ohne Durchströmöffnungen erreichen schon relativ gute Schallabsorptionswerte.The intermediate floors 33, 34 may be made of microperforated sheet material, similar to FIG FIG. 2 but you do not have to. Even intermediate floors without throughflow already achieve relatively good sound absorption values.

Das Rohr 1 im Bereich innerhalb des Gehäuses besteht z.B. aus gewickeltem Flachmaterial, wobei auch eine Mehrfachwicklung möglich ist. Der mikroperforierte Teil des Rohres 1 kann an einen nichtperforierten Rohrabschnitt, der aus dem Gehäuse 2 herausragt, angeschweißt sein.The tube 1 in the area inside the housing consists e.g. made of wound flat material, whereby a multiple winding is possible. The microperforated part of the tube 1 may be welded to a non-perforated tube section which protrudes from the housing 2.

Die Zwischenböden 33, 34 können z.B. durch Crimpen oder eine andere plastische Umformung am Rohr 1 und/oder dem Gehäuse 2 befestigt sein. Auch eine Schweiß- oder radiale Klemmverbindung ist natürlich denkbar.The shelves 33, 34 may e.g. be attached by crimping or other plastic deformation of the tube 1 and / or the housing 2. A welding or radial clamping connection is of course conceivable.

Claims (13)

  1. An exhaust silencer for the internal combustion engine of a motor vehicle, comprising a gastight housing (2; 14) having an exhaust gas inlet and an exhaust gas outlet, at least one sound absorbing functional chamber (10; 20, 21, 22, 23) through which gas flows, and at least one wall in the interior of the housing (2; 14), the wall having micro-perforations and being exposed to the pulsating exhaust gas flow,
    wherein
    at least one gas-carrying tube extends through the housing (2) and is formed as a micro-perforated wall at least in sections and has a degree of perforation (ratio of perforated surface area to total surface area) in the range of from 1 to 3%,
    characterized in that at least one radial intermediate bottom (33, 34) that extends between the inner side of the housing (2) and the shell surface of the tube (1) is arranged in the housing (2), and
    in that the ratio of the distance (I) of the end faces (31, 32) of the housing (2) to the distance (I1, I2) of the intermediate bottom (33, 34) from the end face (31, 32) close to it is in the range of from 1.8 to 2.2 or in the range of from 2.8 to 3.2.
  2. The exhaust silencer according to claim 1,
    characterized in that
    it includes a micro-perforated wall having a multilayer structure and comprising a stiff perforated support wall and at least one micro-perforated flat material in the form of a micro-perforated foil and in surface contact with the support wall.
  3. The exhaust silencer according to either of the preceding claims,
    characterized in that
    the tube consists, at least in sections, of a corrugated or folded micro-perforated carrier foil and two micro-perforated coating foils applied thereto on both sides.
  4. The exhaust silencer according to any of the preceding claims,
    characterized in that
    the tube (1) is micro-perforated substantially over almost the entire distance passing through the housing (2).
  5. The exhaust silencer according to any of the preceding claims,
    characterized in that
    the housing (2) extends substantially concentrically with the tube (1).
  6. The exhaust silencer according to claim 5,
    characterized in that
    the ratio of the outside diameter (da) of the housing (2) to the outside diameter (di) of the tube (1) passing through the housing (2) is in the range of from 2.5 to 4.
  7. The exhaust silencer according to any of the preceding claims,
    characterized in that
    at least two radial intermediate bottoms (33, 34) that are spaced from each other and extend between the inner side of the housing (2) and the shell surface of the tube (1) are arranged in the housing (2), the ratio of the distance (I) of the end faces (31, 32) of the housing (2) to the distance (I1) of an intermediate bottom (33) from its end face (31) close to it being in the range of from 1.8 to 2.2 and the ratio of the distance (I) of the end faces (31, 32) of the housing (2) to the distance (I2) of the further intermediate bottom (34) from the end face (32) close to it being in the range of from 2.5 to 3.2.
  8. The exhaust silencer according to any of the preceding claims,
    characterized in that
    the intermediate bottom (33, 34) has a degree of perforation (ratio of perforated surface area to total surface area) in the range of from 1 to 3%.
  9. The exhaust silencer according to any of the preceding claims,
    characterized in that
    at least one functional chamber (10) is at least partly lined with a micro-perforated flat material or has a filling (11) of micro-perforated flat material.
  10. The exhaust silencer according to claim 9,
    characterized in that
    the filling (11) of micro-perforated flat material comprises a plurality of layers substantially parallel to each other.
  11. The exhaust silencer according to claim 10,
    characterized in that
    the distance between the individual layers amounts to between 12 times and 80 times, preferably between 15 and 40 times, the thickness of the micro-perforated flat material.
  12. The exhaust silencer according to any of the preceding claims,
    characterized in that
    the wall is formed by a wound or folded strip of micro-perforated flat material.
  13. The exhaust silencer according to any of the preceding claims,
    characterized in that
    a plurality of tubes (12, 13) of micro-perforated flat material are provided which are substantially concentric with each other.
EP14190957.2A 2003-08-11 2004-08-11 Exhaust Silencer Expired - Lifetime EP2851526B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2003137111 DE10337111A1 (en) 2003-08-11 2003-08-11 Internal combustion engine silencer for use on road vehicle has straight-through pipe with perforations surrounded by outer housing with perforated tubes acting as damping chambers
DE2003137110 DE10337110A1 (en) 2003-08-11 2003-08-11 Internal combustion engine silencer for use on road vehicle has straight-through pipe with perforations surrounded by outer housing with perforated tubes acting as damping chambers
EP08000648A EP1953354A1 (en) 2003-08-11 2004-08-11 Exhaust silencer
EP04019054.8A EP1507071B2 (en) 2003-08-11 2004-08-11 Exhaust silencer

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EP04019054.8A Division EP1507071B2 (en) 2003-08-11 2004-08-11 Exhaust silencer
EP04019054.8A Division-Into EP1507071B2 (en) 2003-08-11 2004-08-11 Exhaust silencer
EP08000648A Division EP1953354A1 (en) 2003-08-11 2004-08-11 Exhaust silencer

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EP2851526B1 true EP2851526B1 (en) 2018-05-23

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005054397C5 (en) * 2005-11-15 2010-02-11 Westa-Holding Gmbh & Co. Kg Pipe silencers with micro-openings
DE102006020155A1 (en) * 2005-12-15 2007-06-21 Friedrich Boysen Gmbh & Co. Kg Exhaust system for internal combustion engines
DE102010061994A1 (en) 2010-11-25 2012-05-31 Gardner Denver Deutschland Gmbh Blower assembly
US9970340B2 (en) 2013-02-12 2018-05-15 Faurecia Emissions Control Technologies, Usa, Llc Vehicle exhaust system with resonance damping
BR112017004638A2 (en) * 2014-09-09 2017-12-05 3M Innovative Properties Co acoustic device
CN106368863A (en) * 2015-07-23 2017-02-01 曼胡默尔有限责任公司 Silencer and air inlet system comprising silencer
CN110800041A (en) * 2017-06-28 2020-02-14 3M创新有限公司 Micro-perforated pipeline
CN110847980A (en) * 2019-11-19 2020-02-28 上海钟音环保设备有限公司 Pipeline multilayer micro-perforated plate silencer and processing method thereof
WO2023283007A2 (en) * 2021-06-04 2023-01-12 Berg Daren Firearm noise suppressor

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB841828A (en) 1955-09-06 1960-07-20 Eberspaecher Walter "improvements relating to casings for the pulsating flow of gases"
DE2738600A1 (en) 1976-08-31 1978-03-02 Nihon Radiator Co SILENCER
US4267899A (en) 1979-08-31 1981-05-19 Donaldson Company, Inc. Muffler assembly
WO1994024382A1 (en) 1993-04-20 1994-10-27 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. False ceiling
WO1998014693A1 (en) 1996-09-30 1998-04-09 Silentor Notox A/S Gas flow silencer
DE19730355C1 (en) 1997-07-15 1999-03-18 Fraunhofer Ges Forschung Noise absorber for air duct in building glazing
WO1999024708A1 (en) 1997-11-12 1999-05-20 Stankiewicz Gmbh Cross-flown gas line with a sound absorbent effect
DE19802624A1 (en) 1998-01-24 1999-07-29 Eberspaecher J Gmbh & Co Exhaust silencer for internal combustion engines
WO2002089110A1 (en) 2001-04-27 2002-11-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Silencer
DE20120470U1 (en) 2001-12-18 2003-04-30 Friedrich Boysen GmbH & Co. KG, 72213 Altensteig Muffler means

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1229434A (en) 1916-04-14 1917-06-12 James Flockhart Silencer.
US3113635A (en) 1959-03-31 1963-12-10 Bolt Beranek & Newman Apparatus for silencing vibrational energy
US3734234A (en) 1971-11-08 1973-05-22 Lockheed Aircraft Corp Sound absorption structure
IT7853327V0 (en) 1978-05-17 1978-05-17 Fiat Spa EXHAUST SILENCER FOR AGRICULTURAL TRACTORS
US5477014A (en) 1989-07-28 1995-12-19 Uop Muffler device for internal combustion engines
CN2096010U (en) 1991-08-07 1992-02-12 成都钢铁厂 Micro vacuum silencer for boiler waste
CN2108179U (en) 1991-12-08 1992-06-24 天津市拖拉机配件厂 Exhaust silencer for ic engine
DE9400428U1 (en) 1994-01-14 1994-04-07 Heinrich Gillet Gmbh & Co Kg, 67480 Edenkoben Device for reducing resonance effects in pipes
SE506188C2 (en) 1996-01-25 1997-11-17 Dale Edward Knipstein Sound absorbing element and method for making this element and use of the element
CN2299155Y (en) 1996-10-30 1998-12-02 李戈夫 Shunting impedance step-down silencer
DE29710491U1 (en) * 1997-02-14 1998-03-12 Westa-Holding GmbH & Co. KG, 33334 Gütersloh Silencer
DE10022902A1 (en) * 1999-08-11 2001-03-08 Hp Chem Pelzer Res & Dev Ltd Component with high absorptive effect over a wide frequency range
GB2383091A (en) 2000-08-18 2003-06-18 Jefferson Liu Engine silencer for controlling back pressure and gas leakage
SE523018C2 (en) * 2001-02-09 2004-03-23 Enklaven Ab Muffler and use of said muffler in an exhaust system for an internal combustion engine
DE10303947A1 (en) 2003-01-31 2004-08-19 J. Eberspächer GmbH & Co. KG Muffler for a heater, especially a vehicle heater

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB841828A (en) 1955-09-06 1960-07-20 Eberspaecher Walter "improvements relating to casings for the pulsating flow of gases"
DE2738600A1 (en) 1976-08-31 1978-03-02 Nihon Radiator Co SILENCER
US4267899A (en) 1979-08-31 1981-05-19 Donaldson Company, Inc. Muffler assembly
WO1994024382A1 (en) 1993-04-20 1994-10-27 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. False ceiling
WO1998014693A1 (en) 1996-09-30 1998-04-09 Silentor Notox A/S Gas flow silencer
DE19730355C1 (en) 1997-07-15 1999-03-18 Fraunhofer Ges Forschung Noise absorber for air duct in building glazing
WO1999024708A1 (en) 1997-11-12 1999-05-20 Stankiewicz Gmbh Cross-flown gas line with a sound absorbent effect
DE19802624A1 (en) 1998-01-24 1999-07-29 Eberspaecher J Gmbh & Co Exhaust silencer for internal combustion engines
WO2002089110A1 (en) 2001-04-27 2002-11-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Silencer
DE20120470U1 (en) 2001-12-18 2003-04-30 Friedrich Boysen GmbH & Co. KG, 72213 Altensteig Muffler means

Also Published As

Publication number Publication date
EP1507071A1 (en) 2005-02-16
EP2851526A1 (en) 2015-03-25
EP1507071B1 (en) 2016-07-13
EP1507071B8 (en) 2016-09-21
EP1507071B2 (en) 2019-10-16

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