EP0415101A1 - Exhaust system, in particular, device for the purification of exhaust gas - Google Patents

Exhaust system, in particular, device for the purification of exhaust gas Download PDF

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Publication number
EP0415101A1
EP0415101A1 EP90114642A EP90114642A EP0415101A1 EP 0415101 A1 EP0415101 A1 EP 0415101A1 EP 90114642 A EP90114642 A EP 90114642A EP 90114642 A EP90114642 A EP 90114642A EP 0415101 A1 EP0415101 A1 EP 0415101A1
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EP
European Patent Office
Prior art keywords
mat
shielding
exhaust gas
rings
shell
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Granted
Application number
EP90114642A
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German (de)
French (fr)
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EP0415101B1 (en
Inventor
Walter Dr. Stoepler
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Leistritz AG
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Leistritz AG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F01N13/102—Other arrangements or adaptations of exhaust conduits of exhaust manifolds having thermal insulation
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
    • F01N3/2857—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing the mats or gaskets being at least partially made of intumescent material, e.g. unexpanded vermiculite
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
    • 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
    • F01N2350/00—Arrangements for fitting catalyst support or particle filter element in the housing
    • F01N2350/02—Fitting ceramic monoliths in a metallic housing
    • 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
    • F01N2470/10—Tubes having non-circular cross section

Definitions

  • the invention relates to an exhaust device with a double-shell housing, the inner shell being mounted at least in sections via an elastic bearing mat, in particular mineral fiber mat in the outer shell, in particular an exhaust gas cleaning device with an outer housing consisting of two half-shells, in which via an elastic bearing mat, in particular a so-called swelling mat, at least one honeycomb-structured carrier body and inner and outer shielding funnels and, if necessary, shielding rings are mounted between successive carrier bodies.
  • the invention is therefore based on the object of designing an exhaust gas device of the type mentioned in such a way that the problems with axial and radial expansion differences are solved with a simple structure, and moreover with a favorable transition to any ceramic parts, without the occurrence of stress peaks and the risk of wrinkles can be.
  • the shielding funnels and rings are formed from a close-meshed, sliding elastic wire mesh mat and are held fixed on both ends.
  • the configuration according to the invention can solve a number of special problems in one.
  • a wire mesh mat - mesh fabrics with a mesh width of ⁇ 0.5 mm are particularly suitable - can be processed very easily in press or deep-drawing molds, so that even very complicated shell structures can be produced.
  • shielding parts made of a wire mesh mat, both in the longitudinal direction and radially and in the transverse direction are very large Provide elasticity so that the expansion differences mentioned at the beginning can be easily absorbed in the wire mesh in both the axial direction and in the radial direction.
  • the special properties of a wire mesh mat also evidently prevent any risk of creasing at different expansions, for example of the shielding funnel produced from such a wire mesh mat and of the ceramic support body which is subsequently clamped around.
  • the porosity of a shielding funnel made of a wire mesh mat does not interfere in any way with the dense design of a shielding funnel drawn from sheet metal, since with a sufficiently small mesh size, sufficient elasticity of the inner shielding component produced therefrom is still guaranteed on the one hand and on the other hand due to the occurring mesh opening neither damage to the mineral fiber mat can take place, which in practice is anyway more heat-resistant than metal, but on the other hand also blowing out or otherwise falling out of parts from the mineral fiber mat can be reliably prevented.
  • the shielding funnel 7 which consists of a wire mesh mat, is resiliently stretched onto the end of the carrier body 4, an additional holding effect also being provided by the pressure of the surrounding mineral fiber mat 5.
  • the inner shielding cylinder can not only be placed very easily around complicated inner structures, as must be the case with the complex-shaped carrier body 4 (FIG. 2), but there can be neither thermally induced stress peaks nor warping or wrinkling Shielding funnels or shielding rings, neither in the radial nor in the axial direction.
  • 3 and 4 is shown using an insulated double shell manifold with a metallic outer housing 1 'and an inner housing 9, as the inventive design of the inner housing from a wire mesh mat in a very simple and effective form can also be used in other types of exhaust devices, to avoid the otherwise usual complicated sliding seats in the area of the inner housing and / or outer housing.
  • a mineral fiber mat 5 'between the outer housing 1' and the wire mesh mat-shaped inner housing 9 provided, because of the complicated structure, the mineral fiber mat 5 'is preferably composed of divided blanks, which preferably abut against one another with their abutting edges.
  • the invention is not restricted to the exemplary embodiments shown.
  • This design can namely be provided in the area of the shielding funnels or rings that the elastic bearing mat is completely eliminated over large sections, which in turn has the advantage that no high compressive forces of this elastic fiber mat have to be absorbed by the wire mesh shielding funnels and shielding rings .
  • the production from the wire mesh mat instead of the usual metal sheets has the advantage that, for example, damage to the monolith is eliminated by the encompassing edge of the shielding funnel or shielding ring. Due to the thermally insulating intermediate layer, excessive thermal heating of the outer shell is avoided even without pulling the bearing mat over the area of the rings and shielding funnels, and on the other hand - in particular if the thermally insulating intermediate layer as paper, film or the like. is made of thermally resistant material - prevents hot exhaust gases from getting into the space between the inner shell and the outer shell, so that they are neither there heating or blowing out the elastic mineral fiber mat present in the area of the monolith at the latest.

Abstract

The invention relates to an exhaust system having a twin-shell casing (1), the inner shell being mounted in the outer shell at least sectionally above an elastic bearing mat (5), in particular a mineral fibre mat, especially to an exhaust gas purification device having an outer casing (1) which consists of two half-shells (1a, 1b) and in which at least one carrier body (4) of honeycomb structure and inner screening funnels (7) on the inlet and outlet sides and, if appropriate, screening rings (10) are mounted between successive carrier bodies (4, 4') above an elastic bearing mat (5), especially a so-called swelling mat, the inner casing, especially the screening funnels (7) and screening rings (10) being formed from a close-mesh wire netting mat displacement-elastic in itself and being held fixed at both ends. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Abgasvorrichtung mit einem zweischaligen Gehäuse, wobei die Innenschale zumindest abschnittsweise über eine elastische Lagermatte, insb. Mineralfasermatte in der Außenschale gelagert ist, insbesondere eine Abgasreinigungsvorrichtung mit einem aus zwei Halbschalen bestehenden Außengehäuse, in welchem über eine elastische Lagermatte, insbes. eine sogenannte Quellmatte, wenigstens ein wabenförmig strukturierter Trägerkörper sowie ein- und ausgangsseitige innere Abschirmtrichter sowie ggfs. Abschirmringe zwischen aufeinanderfolgenden Trägerkörpern gelagert sind.The invention relates to an exhaust device with a double-shell housing, the inner shell being mounted at least in sections via an elastic bearing mat, in particular mineral fiber mat in the outer shell, in particular an exhaust gas cleaning device with an outer housing consisting of two half-shells, in which via an elastic bearing mat, in particular a so-called swelling mat, at least one honeycomb-structured carrier body and inner and outer shielding funnels and, if necessary, shielding rings are mounted between successive carrier bodies.

Bei derartigen Abgasvorrichtungen mit zweischaligem Gehäuse besteht grundsätzlich das Problem eines Ausgleichs der thermischen Ausdehnungsunterschiede zwischen der inneren Schale und der äußeren Schale, die wegen der thermischen Abschirmung durch die Mineralfasermatte im Betrieb be­trächtliche Temperaturunterschiede aufweist. Üblicherweise geht man zum Abfangen der thermischen Ausdehnungsunter­schiede davon aus, daß man zu wenigstens auf irgend einer Seite einen Schiebesitz einbaut. Dabei ergibt sich die miß­liche Situation, daß man zwei unterschiedliche thermische Ausdehnungsunterschiede berücksichtigen muß, und zwar ein­mal radiale Dehnungsunterschiede zwischen Innenschale und Außenschale und zum anderen axiale Dehnungsunterschiede zwischen dem inneren Auskleidungstrichter und beispiels­weise dem daran anstoßenden meist keramischen Trägerkörper. Selbst wenn man durch eine Segmentaufteilung auch diese ra­dialen Dehnungsunterschiede aufzufangen versucht, so hat es sich in der Praxis gezeigt, daß die überlappenden Bereiche, in denen die Dehnungsverschiebung stattfinden sollte, bei den hohen Betriebstemperaturen häufig so stark aneinander haften, daß in Wirklichkeit ein funktionierender Schiebes­itz gar nicht zustande kommt und somit Auskleidungstrichter und sonstige Abstandsringe richtiggehende Falten werfen, was zu erheblichen Spannungen und einer großen Bruchgefahr der Keramikmonolithe führt. Aber auch bei Abgasvorrichtungen ohne eingebaute mineralische Trägerkörper, wie beispielsweise bei isolierten Dop­pelschalenkrümmern, ist das Problem des Abfangens der Deh­nungsunterschiede der gasführenden inneren Krümmerschalen gegenüber den tragenden äußeren Krümmerschalen in gleicher Weise relvant.In such exhaust gas devices with a two-shell housing, there is basically the problem of compensating for the thermal expansion differences between the inner shell and the outer shell, which has considerable temperature differences during operation because of the thermal shielding by the mineral fiber mat. To compensate for the thermal expansion differences, it is usually assumed that a sliding seat is installed on at least one side. This results in the unfortunate situation that two different thermal expansion differences have to be taken into account, namely radial expansion differences between the inner shell and the outer shell and secondly axial expansion differences between the inner lining funnel and, for example, the mostly ceramic carrier body which is in contact with it. Even if one tries to compensate for these radial expansion differences by dividing the segments, it has been shown in practice that the overlapping areas in which the expansion shift should take place often so strongly at the high operating temperatures are liable for the fact that a functioning sliding seat does not come into being at all and thus lining funnels and other spacer rings throw correct folds, which leads to considerable tension and a great risk of breakage of the ceramic monoliths. But even in exhaust gas devices without built-in mineral carrier bodies, such as, for example, in insulated double-shell manifolds, the problem of absorbing the expansion differences of the gas-carrying inner manifold shells compared to the load-bearing outer manifold shells is relevant in the same way.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Abgas­vorrichtung der eingangs genannten Art so auszugestalten, daß mit einfachem Aufbau die Probleme mit axialen und ra­dialen Dehnungsunterschieden, noch dazu bei günstigem Übergang zu etwaigen keramischen Teilen, ohne das Auftreten von Spannungsspitzen und die Gefahr eines Faltenbildens gelöst werden können.The invention is therefore based on the object of designing an exhaust gas device of the type mentioned in such a way that the problems with axial and radial expansion differences are solved with a simple structure, and moreover with a favorable transition to any ceramic parts, without the occurrence of stress peaks and the risk of wrinkles can be.

Zur Lösung dieser Aufgabe ist erfindungsgemäß vorgesehen, daß die Abschirmtrichter und -ringe aus einer engmaschigen schiebeelastischen Drahtgewebematte gebildet und beidends fixiert gehaltert sind.To solve this problem it is provided according to the invention that the shielding funnels and rings are formed from a close-meshed, sliding elastic wire mesh mat and are held fixed on both ends.

Durch die erfindungsgemäße Ausgestaltung lassen sich in ei­nem gleich eine Reihe von besonderen Problemen lösen. Zum einen läßt sich eine solche Drahtgewebematte - geeignet sind dabei bevorzugt Maschengewebe mit einer Maschenweite < 0,5 mm - sehr einfach in Preß- oder Tiefziehformen verar­beiten, so daß auch sehr komplizierte Schalengebilde gefer­tigt werden können. Zum anderen sind derartige Abschirm­teile aus einer Drahtgewebematte, sowohl in Längsrichtung als auch radial und in Querrichtung, mit einer sehr großen Elastizität versehen, so daß die eingangs angesprochenen Dehnungsunterschiede sowohl in axialer Richtung als auch in radialer Richtung bequem im Drahtgewebe abgefangen werden können.The configuration according to the invention can solve a number of special problems in one. On the one hand, such a wire mesh mat - mesh fabrics with a mesh width of <0.5 mm are particularly suitable - can be processed very easily in press or deep-drawing molds, so that even very complicated shell structures can be produced. On the other hand, such shielding parts made of a wire mesh mat, both in the longitudinal direction and radially and in the transverse direction, are very large Provide elasticity so that the expansion differences mentioned at the beginning can be easily absorbed in the wire mesh in both the axial direction and in the radial direction.

Bei einer bevorzugten Ausbildung einer erfindungsgemäßen Abgasreinigungsvorrichtung derart, daß der im Anschlußstut­zen verklemmte oder verschweißte Abschirmtrichter das stirnseitige Ende des Trägerkörpers klemmend umgreift, wo­bei etwaige Abschirmringe in entsprechender Weise die be­nachbarten Trägerkörperenden klemmend umgreifen sollen, er­gibt sich mit dem Ausgleich der Dehnungstoleranz auch eine absolute Sicherheit dagegen, daß durch etwaige unterschied­liche Dehnungen allzu starke Spannungsspitzen auftreten, die zu einer Zerstörung der dünnwandigen Keramik führen könnten.In a preferred embodiment of an exhaust gas purification device according to the invention in such a way that the shielding funnel, which is clamped or welded in the connecting piece, clamps around the front end of the carrier body, with any shielding rings correspondingly encompassing the adjacent ends of the carrier body, there is also absolute security against this with the compensation of the expansion tolerance that due to possible different strains, too strong stress peaks occur, which could lead to the destruction of the thin-walled ceramic.

Die besondere Eigenschaften einer Drahtgewebematte verhin­dern ersichtlich auch jegliche Gefahr eines Faltenwerfens bei unterschiedlichen Dehnungen beispielsweise des aus ei­ner solchen Drahtgewebematte hergestellten Abschirmtrichtrs und des anschließend klemmend umgriffenen keramischen Trä­gerkörpers. Wie dabei umfangreiche Versuche gezeigt haben, stört die Porosität eines Abschirmtrichters aus einer Drahtgewebematte gegenüber der dichten Ausbildung eines aus Blech tiefgezogenen Abschirmtrichters in keiner Weise, da bei genügend kleiner Maschengröße einerseits immer noch eine ausreichende Elastizität des daraus hergestellten in­neren Abschirmbauteils gewährleistet ist und andererseits durch die auftretende Maschenöffnung weder eine Beschädi­gung der Mineralfasermatte stattfinden kann, die ja in der Praxis sowieso hitzebeständiger ist als Metall, anderer­seits aber auch ein Ausblasen oder sonstiges Herausfallen von Teilen aus der Mineralfasermatte zuverlässig verhindert werden kann.The special properties of a wire mesh mat also evidently prevent any risk of creasing at different expansions, for example of the shielding funnel produced from such a wire mesh mat and of the ceramic support body which is subsequently clamped around. As extensive tests have shown, the porosity of a shielding funnel made of a wire mesh mat does not interfere in any way with the dense design of a shielding funnel drawn from sheet metal, since with a sufficiently small mesh size, sufficient elasticity of the inner shielding component produced therefrom is still guaranteed on the one hand and on the other hand due to the occurring mesh opening neither damage to the mineral fiber mat can take place, which in practice is anyway more heat-resistant than metal, but on the other hand also blowing out or otherwise falling out of parts from the mineral fiber mat can be reliably prevented.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Aus­führungsbeispiels sowie anhand der Zeichnung. Dabei zeigen:

  • Fig. 1 einen Längsschnitt durch eine erfindungsgemäß ausge­bildete Abgasreinigungsvorrichtung,
  • Fig. 2 einen Schnitt längs der Linie II - II in Fig. 1,
  • Fig. 3 einen Längsschnitt durch einen isolierten Doppel­schalenkrümmer mit aus einer Drahtgewebematte ge­bildetem Innengehäuse und
  • Fig. 4 einen Querschnitt längs der Linie IV - IV in Fig. 3.
Further advantages, features and details of the invention result from the following description of an exemplary embodiment and from the drawing. Show:
  • 1 shows a longitudinal section through an exhaust gas cleaning device designed according to the invention,
  • 2 shows a section along the line II-II in FIG. 1,
  • Fig. 3 shows a longitudinal section through an insulated double shell manifold with an inner housing formed from a wire mesh mat and
  • 4 shows a cross section along the line IV-IV in FIG. 3.

Die in den Fig. 1 und 2 dargestellte Abgasreinigungsvor­richtung umfaßt in an sich bekannter Weise ein zweischali­ges Außengehäuse 1, dessen beide Halbschalen 1a und 1b an ihrem in der Trennebene verlaufenden Flanschen 2 und 3 mit­einander verschweißt sind. Im Außengehäuse 1 sind im ge­zeigten Ausführungsbeispiel zwei wabenförmig strukturierte keramische Trägerkörper 4 u. 4′ mit Hilfe einer über die gesamte Länge der Abgasreinigungsvorrichtung durchgehenden Mineralfasermatte 5 gelagert, die in der Mitte voneinander beabstandet sind. Der den Eingangskonus 6 und den nicht ge­zeigten Ausgangskonus überdeckende an sich bekannte innere Abschirmtrichter 7 besteht erfindungsgemäß aus einer Draht­gewebematte, die sowohl auf der Eingangsseite im An­schlußstutzen befestigt ist - was im vorliegenden Fall durch eine Verklemmung erreicht ist - als auch auf der ge­genüberliegenden Seite fixiert gehaltert ist. Zu diesem Zweck ist im gezeigten Ausführungsbeispiel der aus einer Drahtgewebematte bestehende Abschirmtrichter 7 federnd ela­stisch auf das Ende des Trägerkörpers 4 aufgespannt, wobei eine zusätzliche Halterungswirkung auch durch den Preßdruck der umgebenden Mineralfasermatte 5 vorhanden ist. In glei­cher Weise ist auch der Abschirmring 10 für den Spalt 11 zwischen den benachbarten Trägerkörpern 4 u. 4′ aus einer Drahtgewebematte hergestellt und auf die Trägerkörperenden aufgespannt. Durch diese Ausbildung läßt sich der innere Abschirmzylinder nicht nur sehr einfach auch um kompli­zierte Innenstrukturen herumlegen, wie es bei dem komplex geformten Trägerkörper 4 (Fig. 2) der Fall sein muß, son­dern es können weder thermisch bedingte Spannungsspitzen auftreten noch ein Verwerfen oder Faltenwerfen der Ab­schirmtrichter bzw. Abschirmringe, weder in radialer noch in axialer Richtung. Dabei versteht es sich von selbst, daß vor dem Aufbringen der Außenschalen 1a u. 1b der um den Trägerkörper 4 gelegte Abschirmtrichter 7 sich in die obere Mulde 8 zunächst nicht völlig hineinlegt, jedenfalls dann nicht, wenn er mit Vorspannung auf den Trägerkörper 4 aufgespannt wird. Mit dem Zusammendrücken der beiden Schalenhälften 1a u. 1b des Außengehäuses wird aber ein etwaiges Abheben an dieser Stelle wieder korrigiert.1 and 2 comprises, in a manner known per se, a two-shell outer housing 1, the two half-shells 1a and 1b of which are welded together on their flanges 2 and 3 running in the parting plane. In the exemplary embodiment shown, two honeycomb-shaped ceramic carrier bodies 4 u. 4 'with the help of a continuous over the entire length of the exhaust gas cleaning device mineral fiber mat 5 which are spaced apart in the middle. The inner shielding funnel 7, which covers the inlet cone 6 and the outlet cone (not shown), consists of a wire mesh mat which is fastened in the connecting piece on the inlet side - which is achieved in the present case by jamming - and also fixed on the opposite side is. To this In the exemplary embodiment shown, the shielding funnel 7, which consists of a wire mesh mat, is resiliently stretched onto the end of the carrier body 4, an additional holding effect also being provided by the pressure of the surrounding mineral fiber mat 5. In the same way, the shielding ring 10 for the gap 11 between the adjacent carrier bodies 4 u. 4 'made of a wire mesh mat and stretched over the ends of the carrier body. With this design, the inner shielding cylinder can not only be placed very easily around complicated inner structures, as must be the case with the complex-shaped carrier body 4 (FIG. 2), but there can be neither thermally induced stress peaks nor warping or wrinkling Shielding funnels or shielding rings, neither in the radial nor in the axial direction. It goes without saying that before applying the outer shells 1a and. 1b the shielding funnel 7 placed around the carrier body 4 does not initially lie completely into the upper trough 8, at least not when it is clamped onto the carrier body 4 with pretension. With the compression of the two shell halves 1a u. 1b of the outer housing, however, any lifting off at this point is corrected again.

In den Fig. 3 und 4 ist anhand eines isolierten Doppelscha­lenkrümmers mit einem metallischen Außengehäuse 1′ und ei­nem Innengehäuse 9 dargestellt, wie die erfindungsgemäße Ausbildung des Innengehäuses aus einer Drahtgewebematte in sehr einfacher und wirksamer Form auch bei anderen Arten von Abgasvorrichtungen dazu verwendet werden kann, die sonst bislang üblichen komplizierten Schiebesitze im Be­reich des Innengehäuses und/oder Außengehäuses zu vermei­den. Auch dort ist, wie üblich, eine Minerealfasermatte 5′ zwischen dem Außengehäuse 1′ und dem aus der Drahtgewebe­ matte geformten Innengehäuse 9 vorgesehen, wobei wegen der komplizierten Struktur die Mineralfasermatte 5′ bevorzugt aus geteilten Zuschnitten zusammengesetzt ist, die mit ih­ren Stoßkanten vorzugsweise dichtend aneinander stoßen.3 and 4 is shown using an insulated double shell manifold with a metallic outer housing 1 'and an inner housing 9, as the inventive design of the inner housing from a wire mesh mat in a very simple and effective form can also be used in other types of exhaust devices, to avoid the otherwise usual complicated sliding seats in the area of the inner housing and / or outer housing. There is, as usual, a mineral fiber mat 5 'between the outer housing 1' and the wire mesh mat-shaped inner housing 9 provided, because of the complicated structure, the mineral fiber mat 5 'is preferably composed of divided blanks, which preferably abut against one another with their abutting edges.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt. So wäre es insbesondere auch möglich, die Abschirmtrichter und -ringe aus zwei durch eine thermisch isolierende Zwischenschicht getrennten Lagen von Drahtgewebematten zu bilden, was bevorzugt in der Weise geschehen kann, daß die Zwischenschicht aus Keramikfasermaterial in Form eines Gewebes, Papiers, Blankets oder Vlieses besteht.The invention is not restricted to the exemplary embodiments shown. In particular, it would also be possible to form the shielding funnels and rings from two layers of wire mesh mats separated by a thermally insulating intermediate layer, which can preferably be done in such a way that the intermediate layer consists of ceramic fiber material in the form of a fabric, paper, blankets or fleece .

Durch diese Ausbildung kann nämlich im Bereich der Abschirmtrichter oder -ringe auch vorgesehen sein, daß die elastische Lagermatte über weite Abschnitte völlig entfällt, was wiederum den Vorteil hat, daß auch keine hohen Druckkräfte dieser elastischen Fasermatte von den Drahtgewebe-Abschirmtrichtern und Abschirmringen aufgefangen werden müssen. Die Fertigung aus der Drahtgewebematte anstelle der üblichen Metallbleche hat den Vorteil, daß beispielsweise eine Beschädigung des Monolithen durch den umgreifenden Rand des Abschirmtrichters oder Abschirmrings ausgeschaltet ist. Durch die thermisch isolierende Zwischenschicht wird aber auch ohne das Durchziehen der Lagermatte auch über den Bereich der Ringe und Abschirmtrichter eine zu starke thermische Aufheizung der Außenschale vermieden und auf der anderen Seite - insbesondere wenn die thermisch isolierende Zwischenschicht als Papier, Folie 0d.dgl. aus thermisch widerstandsfähigem Material gebildet ist - verhindert, daß heiße Abgase in den Zwischenraum zwischen der Innenschale und der Außenschale gelangen können, so daß sie dort weder eine Aufheizung, noch ein Ausblasen der spätestens im Bereich des Monolithen vorhandenen elastischen Mineralfasermatte bewirken können.This design can namely be provided in the area of the shielding funnels or rings that the elastic bearing mat is completely eliminated over large sections, which in turn has the advantage that no high compressive forces of this elastic fiber mat have to be absorbed by the wire mesh shielding funnels and shielding rings . The production from the wire mesh mat instead of the usual metal sheets has the advantage that, for example, damage to the monolith is eliminated by the encompassing edge of the shielding funnel or shielding ring. Due to the thermally insulating intermediate layer, excessive thermal heating of the outer shell is avoided even without pulling the bearing mat over the area of the rings and shielding funnels, and on the other hand - in particular if the thermally insulating intermediate layer as paper, film or the like. is made of thermally resistant material - prevents hot exhaust gases from getting into the space between the inner shell and the outer shell, so that they are neither there heating or blowing out the elastic mineral fiber mat present in the area of the monolith at the latest.

In diesem Zusammenhang sei schließlich noch darauf hingewiesen, daß infolge der meist gegebenen Unsymmetrie von Drahtgewebematten hinsichtlich ihrer Schiebeelastizität in unterschiedlichen Richtungen man selbstverständlich die Orientierung der Matten beim Einbau als Abschirmtrichter oder Abschirmring so wählen wird, daß in der zu erwartenden größten Dehnungsrichtung auch die größte Schiebeelastizität besteht.In this context, it should finally be pointed out that due to the mostly existing asymmetry of wire mesh mats with regard to their sliding elasticity in different directions, the orientation of the mats when installing as a shielding funnel or shielding ring will of course be chosen such that the greatest sliding elasticity is also expected in the greatest direction of expansion to be expected consists.

Claims (5)

1. Abgasvorrichtung mit einem zweischaligen Gehäuse, wobei die Innenschale zumindest abschnittsweise über eine elastische Lagermatte, insb. Mineralfasermatte, in der Außenschale gelagert ist, insbesondere Abgasreinigungsvorrichtung mit einem aus zwei Halbschalen bestehenden Außengehäuse, in welchem über eine elastische Lagermatte, insbesondere eine sogenannte Quellmatte, wenigstens ein wabenförmig strukturierter Trägerkörper sowie ein- und ausgangsseitige innere Abschirmtrichter sowie ggf. Abschirmringe zwischen aufreinanderfolgenden Trägerkörpern gelagert sind, dadurch gekennzeichnet, daß das Innengehäuse (9), insbesondere die Abschirmtrichter (7) und -ringe (10), aus einer engmaschigen und in sich schiebeelastischen Drahtgewebematte gebildet und beidends fixiert gehaltert sind.1.Exhaust device with a double-shell housing, the inner shell being mounted at least in sections via an elastic bearing mat, in particular mineral fiber mat, in the outer shell, in particular exhaust-gas cleaning device with an outer housing consisting of two half-shells, in which an elastic bearing mat, in particular a so-called swelling mat, At least one honeycomb-shaped support body and input and output-side inner shielding funnels and, if necessary, shielding rings are mounted between successive support bodies, characterized in that the inner housing (9), in particular the shielding funnels (7) and rings (10), consist of a closely-knit and in elastic wire mesh mat are formed and are fixed on both sides. 2. Abgasreinigungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der im Anschlußstutzen verklemmte oder verschweißte Abschirmtrichter (7) das stirnsei­tige Ende des Trägerkörpers (4,4′) klemmend umgreift.2. Exhaust gas purification device according to claim 1, characterized in that the shielded funnel (7) clamped or welded in the connecting piece engages around the end face of the carrier body (4, 4 ') by clamping. 3. Abgasreinigungsvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Abschirmringe (10) die benachbarten Trägerkörperenden klemmend umgrei­fen.3. Exhaust gas purification device according to claim 1 or 2, characterized in that the shielding rings (10) clamp around the adjacent carrier body ends. 4. Abgasreinigungsvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Abschirmtrichter und -ringe aus zwei durch eine thermisch isolierende Zwischenschicht getrennten Lagen von Drahtgewerbematten gebildet sind.4. Exhaust gas purification device according to one of claims 1 to 3, characterized in that the shielding funnels and rings from two by one thermally insulating intermediate layer separate layers of wire mesh are formed. 5. Abgasreinigungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Zwischenschicht aus Keramikfasermaterial in Form eines Gewebes, Papiers, Blankets oder Vlieses besteht.5. Exhaust gas purification device according to claim 4, characterized in that the intermediate layer consists of ceramic fiber material in the form of a fabric, paper, blankets or fleece.
EP90114642A 1989-09-02 1990-07-31 Exhaust system, in particular, device for the purification of exhaust gas Expired - Lifetime EP0415101B1 (en)

Applications Claiming Priority (2)

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DE3929205A DE3929205A1 (en) 1989-09-02 1989-09-02 EXHAUST APPARATUS, IN PARTICULAR. EXHAUST GAS PURIFICATION DEVICE
DE3929205 1989-09-02

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EP0415101B1 EP0415101B1 (en) 1993-09-22

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EP0472009A1 (en) * 1990-08-22 1992-02-26 Firma J. Eberspächer Exhaust gas purifying device with two exhaust gas treatment bodies one behind the other
EP0603754A1 (en) * 1992-12-22 1994-06-29 LEISTRITZ AG &amp; CO. Abgastechnik Device for reducing exhaust emissions, especially for motor vehicles
EP0719912A1 (en) * 1994-12-30 1996-07-03 Firma J. Eberspächer Exhaust gas treatment device of internal combustion engines
FR2751376A1 (en) * 1996-07-17 1998-01-23 Daimler Benz Ag ELBOW EXHAUST TUBING FOR GUIDING THE EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE
EP1308607A2 (en) * 2001-11-02 2003-05-07 Delphi Technologies, Inc. End cones for exhaust emission control devices and methods of making
FR3084109A1 (en) * 2018-07-23 2020-01-24 Renault S.A.S. THERMAL INSULATION DEVICE ON THE EXHAUST OF A HEAT ENGINE
DE102019104940A1 (en) * 2019-02-27 2020-08-27 Eberspächer Exhaust Technology GmbH & Co. KG Exhaust converter housing structure
CN115585037A (en) * 2022-09-27 2023-01-10 九江学院 Tail gas trapping structure

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DE10018805A1 (en) 2000-04-15 2001-11-29 Volkswagen Ag Method and device for producing a catalyst with a monolith having a polygonal cross section
DE102009037520A1 (en) * 2009-08-17 2011-04-21 Poroson Gmbh Exhaust manifold for mounting at cylinder head of internal-combustion engine, has gas channel including metal fabric provided with chaining threads, weft threads and pores that are formed between chaining threads and weft threads
US9790836B2 (en) 2012-11-20 2017-10-17 Tenneco Automotive Operating Company, Inc. Loose-fill insulation exhaust gas treatment device and methods of manufacturing

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Publication number Priority date Publication date Assignee Title
EP0472009A1 (en) * 1990-08-22 1992-02-26 Firma J. Eberspächer Exhaust gas purifying device with two exhaust gas treatment bodies one behind the other
EP0603754A1 (en) * 1992-12-22 1994-06-29 LEISTRITZ AG &amp; CO. Abgastechnik Device for reducing exhaust emissions, especially for motor vehicles
EP0719912A1 (en) * 1994-12-30 1996-07-03 Firma J. Eberspächer Exhaust gas treatment device of internal combustion engines
FR2751376A1 (en) * 1996-07-17 1998-01-23 Daimler Benz Ag ELBOW EXHAUST TUBING FOR GUIDING THE EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE
EP1308607A2 (en) * 2001-11-02 2003-05-07 Delphi Technologies, Inc. End cones for exhaust emission control devices and methods of making
EP1308607A3 (en) * 2001-11-02 2004-06-09 Delphi Technologies, Inc. End cones for exhaust emission control devices and methods of making
FR3084109A1 (en) * 2018-07-23 2020-01-24 Renault S.A.S. THERMAL INSULATION DEVICE ON THE EXHAUST OF A HEAT ENGINE
WO2020020828A1 (en) * 2018-07-23 2020-01-30 Renault S.A.S Thermal insulation device for the exhaust of a heat engine
CN112469892A (en) * 2018-07-23 2021-03-09 雷诺股份公司 Thermal insulation device for exhaust gases of a heat engine
DE102019104940A1 (en) * 2019-02-27 2020-08-27 Eberspächer Exhaust Technology GmbH & Co. KG Exhaust converter housing structure
CN115585037A (en) * 2022-09-27 2023-01-10 九江学院 Tail gas trapping structure

Also Published As

Publication number Publication date
ES2044341T3 (en) 1994-01-01
EP0415101B1 (en) 1993-09-22
DE3929205A1 (en) 1991-03-21
DE3929205C2 (en) 1992-01-23
DE59002823D1 (en) 1993-10-28

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