EP0174919B1 - Catalytic off gas purification device - Google Patents

Catalytic off gas purification device Download PDF

Info

Publication number
EP0174919B1
EP0174919B1 EP85890185A EP85890185A EP0174919B1 EP 0174919 B1 EP0174919 B1 EP 0174919B1 EP 85890185 A EP85890185 A EP 85890185A EP 85890185 A EP85890185 A EP 85890185A EP 0174919 B1 EP0174919 B1 EP 0174919B1
Authority
EP
European Patent Office
Prior art keywords
housing
funnel
inflow
sheet metal
outflow
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
Application number
EP85890185A
Other languages
German (de)
French (fr)
Other versions
EP0174919A2 (en
EP0174919A3 (en
Inventor
Werner Lampel
Burghard Wurzer
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.)
Cessione vastag Automobiltechnik GmbH
Original Assignee
Roth Technik Austria 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.)
Filing date
Publication date
Application filed by Roth Technik Austria GmbH filed Critical Roth Technik Austria GmbH
Priority to AT85890185T priority Critical patent/ATE30618T1/en
Publication of EP0174919A2 publication Critical patent/EP0174919A2/en
Publication of EP0174919A3 publication Critical patent/EP0174919A3/en
Application granted granted Critical
Publication of EP0174919B1 publication Critical patent/EP0174919B1/en
Expired legal-status Critical Current

Links

Images

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
    • 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
    • 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
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/08—Repairing the housing or pipe-joints

Definitions

  • the invention relates to a catalytic exhaust gas purification device for internal combustion engines with a carrier matrix for the catalytic converter arranged in a housing made of sheet metal, with an inflow funnel and an outflow funnel made of sheet metal connected to the ends thereof.
  • the housing is welded gas-tight to the inflow funnel and the outflow funnel. The welding is a complex job.
  • the carrier matrix is also inserted directly into the housing, optionally with the interposition of a heat-insulating layer. Rigid formation of the carrier matrix is therefore necessary.
  • Such a rigid design has the prerequisite that the support matrix must be rigid, which in turn reduces the surfaces which are coated with the catalyst.
  • a catalyst in a housing has become known, in which the inflow funnel or the outflow funnel is welded to associated guide plates and is connected to a housing.
  • a carrier matrix for the catalytic converter which is accommodated in a cladding tube, is arranged inside this housing, this cladding tube resiliently abutting the inner circumference of the housing.
  • the invention now aims to provide a simple design of a catalytic exhaust gas cleaning device with large effective surfaces, in which the risk of non-cleaned media flowing past the catalyst material is avoided.
  • the invention consists essentially in that the inflow funnel and outflow funnel are connected to the housing by folding over the entire circumference thereof, that the support matrix is surrounded over its entire length by a tubular metallic jacket, that the tubular jacket at both ends protrudes beyond the support matrix and that the protruding ends of the tubular jacket are clamped in the fold connection between the housing and the inflow funnel or the outflow funnel.
  • the support matrix is surrounded over its entire length by a tubular metallic jacket, the support matrix is protected and stiffened by this jacket, so that the effective surface thereof can be made relatively large.
  • the carrier matrix is preferably of metallic construction and because it is stiffened by the tubular jacket, it can consist of thin metal foils which leave flow cross sections between them, the effective surface, which is coated with the catalyst material, due to the thin formation of the sheets or foils , is enlarged.
  • Such a metallic carrier matrix can consist, for example, of corrugated and flat metal foils stacked on top of one another, which are rolled up and inserted into the tubular jacket.
  • the clamping point has the effect of a labyrinth seal, which prevents the exhaust gases from flowing around the tubular jacket and ensures that all of the exhaust gases to be cleaned flow through the carrier matrix. Clamping the jacket in the fold connection also has the advantage that slight different thermal expansions of the housing and tubular jacket can be absorbed at the clamping point.
  • the arrangement is such that the inflow funnel and outflow funnel have on their periphery an outwardly bent cylindrical board which is coaxial with the tubular jacket, and on the outer edge of which a sheet metal part which is bent twice in a C-shape in cross section is connected that the housing has cylindrical end parts in the region of its front ends, to which sheet metal parts bent in a C-shaped cross-section connect radially outwards and to the center of the housing, that the bent sheet metal part of the housing is encompassed by the bent metal part of the inflow and outflow funnel and is connected to this by crimping and that the projecting ends of the tubular cylindrical shell are clamped between the cylindrical rims of the inflow and outflow funnel and the cylindrical end parts of the housing.
  • the projecting ends of the tubular jacket lie between cylindrical parts of the housing and the inflow funnel and the outflow funnel.
  • a good seal is achieved between the cylindrical jacket and the inflow and outflow funnel and, above all, due to the cylindrical design of the contact surfaces, a relatively large expansion path is available for uneven axial thermal expansion of the tubular jacket and the housing.
  • the tubular jacket is expediently of circular cylindrical design, but it is also possible to use a cylinder with an oval cross section.
  • the arrangement is expediently such that the C-shaped sheet metal part of the housing is bent back by 180 'to the center of the housing.
  • the end parts of the housing are expediently offset radially inwards to a smaller diameter, a heat-insulating intermediate layer, preferably a fiber mat made of ceramic fibers, being arranged between the housing and the tubular jacket.
  • the tubular jacket has the same cross-section over its entire length and the end parts of the housing connect to the tubular jacket. Characterized in that these end parts are offset inwards on a smaller diameter, a space is created between the housing and the tubular jacket and this space makes it possible to provide the heat-insulating intermediate layer.
  • the full effectiveness of the catalyst only begins above a certain temperature and this heat-insulating intermediate layer enables the support matrix to be kept warm. In addition, excessive heating of the housing, which, for example, poses a fire risk when driving on a dry grass surface, is avoided.
  • the carrier matrix and the tubular jacket are preferably made of stainless steel.
  • the invention is illustrated using an exemplary embodiment which shows a catalytic exhaust gas cleaning device for internal combustion engines, in particular vehicle engines.
  • Fig. 1 shows an axial section through a catalytic exhaust gas purification device.
  • Fig. 2 shows the fold connection on a larger scale.
  • 1 is the housing, 2 the inflow funnel and 3 the outflow funnel.
  • a perforated conical distributor plate 4 for the inflowing exhaust gases is arranged in the inflow funnel.
  • 5 is the metallic support matrix, which consists for example of wound sheet metal foils, between which there are longitudinal flow channels, the walls of which are coated with the catalyst material.
  • the carrier matrix 6 is a tubular circular cylindrical jacket which surrounds the carrier matrix 5 and forms a good holder for the carrier matrix, so that the carrier matrix can consist of thin metal foils.
  • the housing 1 is connected to the inflow funnel 2 and the outflow funnel 3 by folds 7.
  • the ends of the housing have a bend 8 by 180 ′ to the center of the housing 1.
  • This bend 8 is encompassed by a double-C-shaped bend 9, 10 of the inflow funnel 2 and the outflow funnel 3.
  • the inflow funnel and the outflow funnel have a cylindrical bend 11 which merges into the bent parts 9 and 10.
  • the housing 1 has cylindrical end parts 12. Between the cylindrical bend 11 and the cylindrical end parts 12 of the housing lie the end parts 14 of the tubular jacket 10 projecting over the end face 13 of the carrier matrix 5. These end parts 14 are between the cylindrical end parts 12 of the housing and the cylindrical parts 11 of the inflow funnel and the outflow funnel clamped.
  • the cylindrical part 11 of the inflow funnel and the outflow funnel projects so far beyond the inflow funnel 2 and the outflow funnel 3 that the attachment of a folding tool is easily possible and therefore the clamping of the end parts 14 of the tubular jacket 6 can be carried out well.
  • the tubular jacket 6 has the same cross section over its entire length.
  • the cylindrical end parts of the housing 1 are stepped inwards to a smaller diameter, so that an annular space 15 remains between the tubular jacket 6 and the housing 1 and is filled with a heat-insulating material.

Abstract

1. Catalytic exhaust purification device for internal combustion engines with a support matrix (5) for the catalyst, which is arranged in a housing (1) made of sheet metal and at the face ends of which an inflow funnel (2) and an outflow funnel (3) of sheet metal adjoin, characterized in that inflow funnel (2) and outflow funnel (3) are connected over the entire periphery of the housing (1) to the latter by lock-seaming, in that the support matrix (5) is surrounded over its entire length by a tubular metal shell (6), in that the tubular shell (6) protrudes at both ends beyond the support matrix (5) and in that the protruding ends of the tubular shell (6) are clamped in the lock-seam connection between the housing (1) and the inflow funnel (2) and the outflow funnel (3), respectively.

Description

Die Erfindung bezieht sich auf eine katalytische Abgasreinigungseinrichtung für Brennkraftmaschinen mit einer in einem aus Blech bestehenden Gehäuse angeordneten Trägermatrix für den Katalysator, an dessen Stirnenden ein Einströmtrichter und ein abströmtrichter aus Blech anschließen. Bei den üblichen Einrichtungen dieser Art ist das Gehäuse mit dem Einströmtrichter und dem Abströmtrichter gasdicht verschweißt. Die Verschweißung ist hiebei eine aufwendige Arbeit. Bei den bekannten Einrichtungen dieser Art ist weiters die Trägermatrix unmittelbar, gegebenenfalls unter Zwischenschaltung einer wärmedämmenden Schicht, in das Gehäuse eingesetzt. Es ist daher eine starre Ausbildung der Trägermatrix erforderlich. Eine solche starre Ausbildung hat zur Voraussetzung, daß die Trägermatrix starr ausgebildet sein muß, wodurch wieder die Oberflächen, welche mit dem Katalysator beschichtet werden, kleiner werden.The invention relates to a catalytic exhaust gas purification device for internal combustion engines with a carrier matrix for the catalytic converter arranged in a housing made of sheet metal, with an inflow funnel and an outflow funnel made of sheet metal connected to the ends thereof. In the usual devices of this type, the housing is welded gas-tight to the inflow funnel and the outflow funnel. The welding is a complex job. In the known devices of this type, the carrier matrix is also inserted directly into the housing, optionally with the interposition of a heat-insulating layer. Rigid formation of the carrier matrix is therefore necessary. Such a rigid design has the prerequisite that the support matrix must be rigid, which in turn reduces the surfaces which are coated with the catalyst.

Aus dem DE-U-74 01 002 ist ein Katalysator in einem Gehäuse bekanntgeworden, bei welchem der Einströmtrichter bzw. der Abströmtrichter mit zugehörigen Leitblechen verschweißt ist und mit einem Gehäuse verbunden ist. Im Inneren dieses Gehäuses ist eine in einem Hüllrohr aufgenommene Trägermatrix für den Katalysator angeordnet, wobei dieses Hüllrohr federnd am inneren Umfang des Gehäuses anliegt. Bei einer derartigen Ausbildung besteht die Gefahr, daß Abgase außerhalb des Hüllrohres an den wirksamen Oberflächen der katalytischen Abgasreinigungsvorrichtung vorbeiströmen und daher zusammen mit Schadstoffen austreten können.From DE-U-74 01 002 a catalyst in a housing has become known, in which the inflow funnel or the outflow funnel is welded to associated guide plates and is connected to a housing. A carrier matrix for the catalytic converter, which is accommodated in a cladding tube, is arranged inside this housing, this cladding tube resiliently abutting the inner circumference of the housing. With such a design, there is a risk that exhaust gases outside the cladding tube flow past the effective surfaces of the catalytic exhaust gas cleaning device and can therefore escape together with pollutants.

Die Erfindung zielt nun darauf ab, eine einfache Ausbildung einer katalytischen Abgasreinigungsvorrichtung mit großen wirksamen Oberflächen zu schaffen, bei welcher die Gefahr eines Vorbeiströmens von nicht gereinigten Medien an dem Katalysatormaterial vermieden wird. Zur Lösung dieser Aufgabe besteht die Erfindung im wesentlichen darin, daß Einströmtrichter und Abströmtrichter über den gesamten Umfang des Gehäuses mit diesem durch Falzung verbunden sind, daß die Trägermatrix über ihre gesamte Länge von einem rohrförmigen metallischen Mantel umgeben ist, daß der rohrförmige Mantel an beiden Enden über die Trägermatrix vorragt und daß die vorragenden Enden des rohrförmigen Mantels in der Falzverbindung zwischen das Gehäuse und den Einströmtrichter bzw. den Abströmtrichter geklemmt sind. Dadurch, daß die Trägermatrix über ihre gesamte Länge von einem rohrförmigen metallischen Mantel umgeben ist, wird die Trägermatrix durch diesen Mantel geschützt und versteift, so daß die wirksame Oberfläche derselben verhältnismäßig groß ausgebildet sein kann. Die Trägermatrix ist vorzugsweise metallisch ausgebildet und dadurch, daß sie durch den rohrförmigen Mantel versteift ist, kann sie aus dünnen Metallfolien bestehen, welche zwischen sich Durchströmquerschnitte freilassen, wobei infolge der dünnen Ausbildung der Bleche oder Folien die wirksame Oberfläche, welche mit dem Katalysatormaterial beschichtet wird, vergrößert wird. Eine solche metallische Trägermatrix kann beispielsweise aus übereinandergeschichteten gewellten und ebenen Metallfolien bestehen, welche eingerollt und in den rohrförmigen Mantel eingesetzt werden. Dadurch, daß die über die Trägermatrix vorragenden Enden des rohrförmigen Mantels in der Falzverbindung zwischen Gehäuse und den Einström- bzw. Abströmtrichter geklemmt sind, wird ein einfacher Anschluß des rohrförmigen Mantels an den Einström- und Abströmtrichter ermöglicht. Die Klemmstelle hat die Wirkung einer Labyrinthdichtung, welche ein Umströmen der Abgase um den rohrförmigen Mantel verhindert und gewährleistet, daß die gesamten zu reinigenden Abgase die Trägermatrix durchströmen. Die Klemmung des Mantels in der Falzverbindung hat überdies auch den Vorteil, daß geringfügige verschiedene Wärmedehnungen von Gehäuse und rohrförmigem Mantel an der Klemmstelle aufgenommen werden können.The invention now aims to provide a simple design of a catalytic exhaust gas cleaning device with large effective surfaces, in which the risk of non-cleaned media flowing past the catalyst material is avoided. To achieve this object, the invention consists essentially in that the inflow funnel and outflow funnel are connected to the housing by folding over the entire circumference thereof, that the support matrix is surrounded over its entire length by a tubular metallic jacket, that the tubular jacket at both ends protrudes beyond the support matrix and that the protruding ends of the tubular jacket are clamped in the fold connection between the housing and the inflow funnel or the outflow funnel. Characterized in that the support matrix is surrounded over its entire length by a tubular metallic jacket, the support matrix is protected and stiffened by this jacket, so that the effective surface thereof can be made relatively large. The carrier matrix is preferably of metallic construction and because it is stiffened by the tubular jacket, it can consist of thin metal foils which leave flow cross sections between them, the effective surface, which is coated with the catalyst material, due to the thin formation of the sheets or foils , is enlarged. Such a metallic carrier matrix can consist, for example, of corrugated and flat metal foils stacked on top of one another, which are rolled up and inserted into the tubular jacket. The fact that the ends of the tubular jacket projecting over the support matrix are clamped in the rebated connection between the housing and the inflow or outflow funnel, enables a simple connection of the tubular jacket to the inflow and outflow funnel. The clamping point has the effect of a labyrinth seal, which prevents the exhaust gases from flowing around the tubular jacket and ensures that all of the exhaust gases to be cleaned flow through the carrier matrix. Clamping the jacket in the fold connection also has the advantage that slight different thermal expansions of the housing and tubular jacket can be absorbed at the clamping point.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist die Anordnung so getroffen, daß Einströmtrichter und Abströmtrichter an ihrem Umfang einen nach außen abgebogenen, mit dem rohrförmigen Mantel gleichachsigen zylindrischen Bord aufweisen, an dessen äußerem Rand ein radial nach außen im Querschnitt doppelt C-förmig abgebogener Blechteil anschließt, daß das Gehäuse im Bereich seiner Stirnenden zylindrische Endteile aufweist, an welche radial nach außen und zur Mitte des Gehäuses im Querschnitt C-förmig abgebogene Blechteile anschließen, daß der nach außen abgebogene Blechteil des Gehäuses vom abgebogenen Blechteil des Einström- und Abströmtrichters umgriffen ist und mit diesem durch Falzung verbunden ist und daß die vorragenden Enden des rohrförmigen zylindrischen Mantels zwischen den zylindrischen Borden des Einström- und Abströmtrichters und den zylindrischen Endteilen des Gehäuses geklemmt sind. Auf diese Weise liegen die vorragenden Enden des rohrförmigen Mantels zwischen zylindrischen Teilen des Gehäuses und des Einströmtrichters und des Abströmtrichters. Es wird dadurch eine gute Dichtung zwischen dem zylindrischen Mantel und dem Einström- und Abströmtrichter erreicht und vor allem steht auch infolge der zylindrischen Ausbildung der Anlageflächen ein verhältnismäßig großer Dehnungsweg für eine ungleiche axiale Wärmedehnung des rohrförmigen Mantels und des Gehäuses zur Verfügung. Der rohrförmige Mantel ist hiebei zweckmäßig kreiszylindrisch ausgebildet, jedoch ist auch die Ausbildung nach einem Zylinder mit ovalem Querschnitt möglich. Da die vorstehenden Enden des rohrförmigen Mantels infolge der zylindrischen Ausbildung der Klemmflächen von Gehäuse und Einströmtrichter und Abströmtrichter verhältnismäßig tief eingreifen können, ist auch eine gute Labyrinthdichtwirkung zwischen Einström- und Abströmtrichter einerseits und rohrförmigem Mantel anderseits gewährleistet.According to a preferred embodiment of the invention, the arrangement is such that the inflow funnel and outflow funnel have on their periphery an outwardly bent cylindrical board which is coaxial with the tubular jacket, and on the outer edge of which a sheet metal part which is bent twice in a C-shape in cross section is connected that the housing has cylindrical end parts in the region of its front ends, to which sheet metal parts bent in a C-shaped cross-section connect radially outwards and to the center of the housing, that the bent sheet metal part of the housing is encompassed by the bent metal part of the inflow and outflow funnel and is connected to this by crimping and that the projecting ends of the tubular cylindrical shell are clamped between the cylindrical rims of the inflow and outflow funnel and the cylindrical end parts of the housing. In this way, the projecting ends of the tubular jacket lie between cylindrical parts of the housing and the inflow funnel and the outflow funnel. As a result, a good seal is achieved between the cylindrical jacket and the inflow and outflow funnel and, above all, due to the cylindrical design of the contact surfaces, a relatively large expansion path is available for uneven axial thermal expansion of the tubular jacket and the housing. The tubular jacket is expediently of circular cylindrical design, but it is also possible to use a cylinder with an oval cross section. Because the protruding ends of the tubular Due to the cylindrical design of the clamping surfaces of the housing and the inflow funnel and outflow funnel, they can engage relatively deeply, and a good labyrinth sealing effect between the inflow and outflow funnel on the one hand and the tubular casing on the other hand is ensured.

Gemäß der Erfindung ist zweckmäßig die Anordnung so getroffen, daß der C-förmig abgebogene Blechteil des Gehäuses um 180' zur Mitte des Gehäuses zurückgebogen ist. Dadurch wird eine gute Verbindung des Einströmtrichters und des Abströmtrichters mit dem Gehäuse erreicht und vor allem bildet auf diese Weise die Falzverbindung selbst eine Labyrinthdichtung zwischen Einström- und Abströmtrichter und dem Gehäuse.According to the invention, the arrangement is expediently such that the C-shaped sheet metal part of the housing is bent back by 180 'to the center of the housing. As a result, a good connection between the inflow funnel and the outflow funnel is achieved with the housing and, above all, the folded connection itself forms a labyrinth seal between the inflow and outflow funnel and the housing.

Gemäß der Erfindung sind zweckmäßig die Endteile des Gehäuses radial nach innen auf kleinerem Durchmesser abgesetzt, wobei zwischen dem Gehäuse und dem rohrförmigen Mantel eine wärmedämmende Zwischenschicht, vorzugsweise eine Fasermatte aus keramischen Fasern, angeordnet ist. Der rohrförmige Mantel ist über seine gesamte Länge mit gleichem Querschnitt ausgebildet und die Endteile des Gehäuses schließen an den rohrförmigen Mantel an. Dadurch, daß diese Endteile nach innen auf kleinerem Durchmesser abgesetzt sind, entsteht zwischen dem Gehäuse und dem rohrförmigen Mantel ein Zwischenraum und durch diesen Zwischenraum wird ermöglicht, die wärmedämmende Zwischenschicht vorzusehen. Die volle Wirksamkeit des Katalysators setzt erst oberhalb einer gewissen Temperatur ein und diese wärmedämmende Zwischenschicht ermöglicht die Warmhaltung der Trägermatrix. Überdies wird auch eine übermäßige Erwärmung des Gehäuses, welche beispielsweise beim Befahren einer dürren Grasfläche eine Brandgefahr mit sich bringt, vermieden.According to the invention, the end parts of the housing are expediently offset radially inwards to a smaller diameter, a heat-insulating intermediate layer, preferably a fiber mat made of ceramic fibers, being arranged between the housing and the tubular jacket. The tubular jacket has the same cross-section over its entire length and the end parts of the housing connect to the tubular jacket. Characterized in that these end parts are offset inwards on a smaller diameter, a space is created between the housing and the tubular jacket and this space makes it possible to provide the heat-insulating intermediate layer. The full effectiveness of the catalyst only begins above a certain temperature and this heat-insulating intermediate layer enables the support matrix to be kept warm. In addition, excessive heating of the housing, which, for example, poses a fire risk when driving on a dry grass surface, is avoided.

Gemäß der Erfindung bestehen vorzugsweise die Trägermatrix und der rohrförmige Mantel aus Edelstahl.According to the invention, the carrier matrix and the tubular jacket are preferably made of stainless steel.

In der Zeichnung ist die Erfindung an Hand eines Ausführungsbeispieles, welches eine katalytische Abgasreinigungsvorrichtung für Brennkraftmaschinen, insbesondere von Fahrzeugmotoren, zeigt, veranschaulicht.In the drawing, the invention is illustrated using an exemplary embodiment which shows a catalytic exhaust gas cleaning device for internal combustion engines, in particular vehicle engines.

Fig. 1 zeigt einen Axialschnitt durch eine katalytische Abgasreinigungseinrichtung. Fig. 2 zeigt im größeren Maßstab die Falzverbindung.Fig. 1 shows an axial section through a catalytic exhaust gas purification device. Fig. 2 shows the fold connection on a larger scale.

1 ist das Gehäuse, 2 der Einströmtrichter und 3 der Abströmtrichter. In den Einströmtrichter ist ein gelochtes kegelförmiges Verteilerblech 4 für die einströmenden Abgase angeordnet. 5 ist die metallische Trägermatrix, welche beispielsweise aus gewickelten Blechfolien besteht, zwischen welchen längsverlaufende Durchströmkanäle bestehen, deren Wände mit dem Katalysatormaterial beschichtet sind.1 is the housing, 2 the inflow funnel and 3 the outflow funnel. A perforated conical distributor plate 4 for the inflowing exhaust gases is arranged in the inflow funnel. 5 is the metallic support matrix, which consists for example of wound sheet metal foils, between which there are longitudinal flow channels, the walls of which are coated with the catalyst material.

6 ist ein rohrförmiger kreiszylindrischer Mantel, welcher die Trägermatrix 5 umgibt und eine gute Halterung für die Trägermatrix bildet, so daß die Trägermatrix aus dünnen Metallfolien bestehen kann.6 is a tubular circular cylindrical jacket which surrounds the carrier matrix 5 and forms a good holder for the carrier matrix, so that the carrier matrix can consist of thin metal foils.

Das Gehäuse 1 ist mit dem Einströmtrichter 2 und dem Abströmtrichter 3 durch Falzungen 7 verbunden. Die Enden des Gehäuses weisen im Querschnitt eine Abbiegung 8 um 180` zur Mitte des Gehäuses 1 auf. Diese Abbiegung 8 wird durch eine doppel-C-förmige Abbiegung 9, 10 des Einströmtrichters 2 und des Abströmtrichters 3 umgriffen. Der Einströmtrichter und der Abströmtrichter weisen eine zylindrische Abbiegung 11 auf, welche in die abgebogenen Teile 9 und 10 übergeht. Das Gehäuse 1 weist zylindrische Endteile 12 auf. Zwischen der zylindrischen Abbiegung 11 und den zylindrischen Endteilen 12 des Gehäuses liegen die über die Stirnseite 13 der Trägermatrix 5 vorragenden Endteile 14 des rohrförmigen Mantels 10. Diese Endteile 14 sind zwischen die zylindrischen Endteile 12 des Gehäuses und die zylindrischen Teile 11 des Einströmtrichters und des Abströmtrichters geklemmt. Der zylindrische Teil 11 des Einströmtrichters und des Abströmtrichters steht über den Einströmtrichter 2 und den Abströmtrichter 3 so weit vor, daß der Ansatz eines Falzwerkzeuges leicht möglich ist und daher die Klemmung der Endteile 14 des rohrförmigen Mantels 6 gut durchgeführt werden kann.The housing 1 is connected to the inflow funnel 2 and the outflow funnel 3 by folds 7. In cross section, the ends of the housing have a bend 8 by 180 ′ to the center of the housing 1. This bend 8 is encompassed by a double-C-shaped bend 9, 10 of the inflow funnel 2 and the outflow funnel 3. The inflow funnel and the outflow funnel have a cylindrical bend 11 which merges into the bent parts 9 and 10. The housing 1 has cylindrical end parts 12. Between the cylindrical bend 11 and the cylindrical end parts 12 of the housing lie the end parts 14 of the tubular jacket 10 projecting over the end face 13 of the carrier matrix 5. These end parts 14 are between the cylindrical end parts 12 of the housing and the cylindrical parts 11 of the inflow funnel and the outflow funnel clamped. The cylindrical part 11 of the inflow funnel and the outflow funnel projects so far beyond the inflow funnel 2 and the outflow funnel 3 that the attachment of a folding tool is easily possible and therefore the clamping of the end parts 14 of the tubular jacket 6 can be carried out well.

Der rohrförmige Mantel 6 weist über seine gesamte Länge gleichen Querschnitt auf. Die zylindrischen Endteile des Gehäuses 1 sind nach innen auf kleineren Durchmesser abgesetzt, so daß zwischen dem rohrförmiggn Mantel 6 und dem Gehäuse 1 ein ringförmiger Zwischenraum 15 verbleibt, der mit einem wärmedämmenden Material ausgefüllt ist.The tubular jacket 6 has the same cross section over its entire length. The cylindrical end parts of the housing 1 are stepped inwards to a smaller diameter, so that an annular space 15 remains between the tubular jacket 6 and the housing 1 and is filled with a heat-insulating material.

Claims (6)

1. Catalytic exhaust purification device for internal combustion engines with a support matrix (5) for the catalyst, which is arranged in a housing (1) made of sheet metal and at the face ends of which an inflow funnel (2) and an outflow funnel (3) of sheet metal adjoin, characterized in that inflow funnel (2) and outflow funnel (3) are connected over the entire periphery of the housing (1) to the latter by lock-seaming, in that the support matrix (5) is surrounded over its entire length by a tubular metal shell (6), in that the tubular shell (6) protrudes at both ends beyond the support matrix (5) and in that the protruding ends of the tubular shell (6) are clamped in the lock-seam connection between the housing (1) and the inflow funnel (2) and the outflow funnel (3), respectively.
2. Catalytic exhaust purification device according to Claim 1, characterized in that inflow funnel (2) and outflow funnel (3) have at their periphery an outwardly bent-off cylindrical rim (11), which is coaxial with the tubular shell (6) and to the outer border of which there adjoins a sheet metal part (9, 10, 11) bent-off radially outward in double C-shaped cross-section, in that the housing (1) has in the region of its face ends cylindrical end parts (12), to which there adjoin sheet metal parts (8) bent-off radially outward and toward the centre of the housing (1) in C-shaped cross-section, in that the outwardly bent-off sheet metal part (8) of the housing (1) is embraced by the bent-off sheet metal part (9, 10, 11) of the inflow and outflow funnels (2, 3) and is connected to the latter by lock-seaming, and in that the protruding ends of the tubular cylindrical shell (6) are clamped between the cylindrical rims of the inflow and outflow funnels (2, 3) and the cylindrical end parts of the housing (1).
3. Catalytic exhaust purification device according to Claim 2, characterized in that the C-shaped bent-off sheet metal part (8) of the housing (1) is bent back by 180° toward the centre of the housing (1).
4. Catalytic exhaust purification device according to Claim 1, 2 or 3, characterized in that the cylindrical end parts (12) of the housing (1) are offset radially inward at a smaller diameter, and in that between the housing (1) and the tubular shell (6) is arranged a heat-insulating intermediate layer, preferably a fibre mat of ceramic fibres.
5. Catalytic exhaust purification device according to one of Claims 1 to 4, characterized in that the support matrix (5) is of metal design.
6. Catalytic exhaust purification device according to one of Claims 1 to 5, characterized in that the support matrix (5) and the tubular shell (6) are made of high-grade steel.
EP85890185A 1984-08-17 1985-08-16 Catalytic off gas purification device Expired EP0174919B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85890185T ATE30618T1 (en) 1984-08-17 1985-08-16 CATALYTIC EXHAUST CONTROL DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3430400A DE3430400C2 (en) 1984-08-17 1984-08-17 Catalytic exhaust gas cleaning device
DE3430400 1984-08-17

Publications (3)

Publication Number Publication Date
EP0174919A2 EP0174919A2 (en) 1986-03-19
EP0174919A3 EP0174919A3 (en) 1986-04-02
EP0174919B1 true EP0174919B1 (en) 1987-11-04

Family

ID=6243334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85890185A Expired EP0174919B1 (en) 1984-08-17 1985-08-16 Catalytic off gas purification device

Country Status (3)

Country Link
EP (1) EP0174919B1 (en)
AT (1) ATE30618T1 (en)
DE (1) DE3430400C2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3733402A1 (en) * 1987-10-02 1989-04-13 Emitec Emissionstechnologie CATALYST ARRANGEMENT WITH FLOW GUIDE
DE3803917C2 (en) * 1988-02-09 1999-02-25 Siemens Ag Arrangement of a honeycomb body in a housing
DE4244315C2 (en) * 1992-08-31 1998-02-26 Zeuna Staerker Kg Catalytic emission control device
GB201303496D0 (en) 2013-02-27 2013-04-10 Norgren Ltd C A Filter with optimized fluid flows
CN109000079A (en) * 2018-09-25 2018-12-14 浙江得亿制氧科技有限公司 A kind of low noise oxygenerator exhaust structure
WO2022268799A1 (en) * 2021-06-23 2022-12-29 Vitesco Technologies GmbH Exhaust gas aftertreatment device having small cavities

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7401002U (en) * 1973-01-13 1974-04-11 T I Silencer Services Ltd Container for catalytic converter for controlling and monitoring exhaust emissions in internal combustion engines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2300704A1 (en) * 1973-01-08 1974-07-11 Eberspaecher J Catalytic exhaust gas purifier - has ceramics element with fired molybdenum coating supported by corrugated tube
DE2301646A1 (en) * 1973-01-13 1974-08-01 Pforzheim Metallschlauch Catalyst vessel with catalyst support system - eliminating free play between catalyst and vessel independently of operating temp. for use in exhaust gas purificn. system
US4160010A (en) * 1976-05-28 1979-07-03 J. Eberspacher Device for purifying exhaust gases
US4237099A (en) * 1979-04-25 1980-12-02 General Motors Corporation Catalytic converter with dual catalyst pellet beds and plenum therebetween

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7401002U (en) * 1973-01-13 1974-04-11 T I Silencer Services Ltd Container for catalytic converter for controlling and monitoring exhaust emissions in internal combustion engines

Also Published As

Publication number Publication date
ATE30618T1 (en) 1987-11-15
DE3430400A1 (en) 1986-02-20
DE3430400C2 (en) 1986-06-26
EP0174919A2 (en) 1986-03-19
EP0174919A3 (en) 1986-04-02

Similar Documents

Publication Publication Date Title
DE2314465C3 (en) Device for catalytic exhaust gas cleaning
EP1715155B1 (en) Exhaust system and corresponding exhaust gas treating apparatus
DE2238255A1 (en) EXHAUST COLLECTORS
DE7541252U (en) DEVICE FOR CLEANING COMBUSTION ENGINE EXHAUST GASES
EP0537603B1 (en) Double-walled air-insulated pipe for exhaust installations in vehicles
DE2238257C3 (en) Exhaust collector for an internal combustion engine
DE2412863C2 (en)
EP0174919B1 (en) Catalytic off gas purification device
EP0177479B1 (en) Catalytic off gas purification device and process for its production
EP0256416B1 (en) Exhaust gas cleaning device
DE3922667C2 (en) Device for catalytic detoxification for deblocking and / or soundproofing of internal combustion engine exhaust gases with a double-walled housing
DE4202079C2 (en) Exhaust system for internal combustion engines
DE2300704A1 (en) Catalytic exhaust gas purifier - has ceramics element with fired molybdenum coating supported by corrugated tube
EP0177480B1 (en) Catalytic off gas purification device
DE2655750A1 (en) DEVICE FOR ACCOMODATION OF CORNIC CATALYSTS
DE4026521C2 (en) Catalyst arrangement, in particular for a motor vehicle internal combustion engine
DE3830352C1 (en) Exhaust emission control device for motor vehicles
DE2458994A1 (en) Exhaust purifier with ceramic catalyst carrier - has overlapping foils between carrier and ceramic fibre jacket in housing
DE2746475A1 (en) Holder for catalytic exhaust gas purifier housing - has clamping band providing secure support even at high temperatures
DE4425995A1 (en) Device for the catalytic cleaning or decomposition of hot exhaust gases
DE4316870A1 (en) Device for purifying exhaust gases from an internal combustion engine and a method for its manufacture
DE3514475A1 (en) Exhaust silencer for an internal combustion engine
DE3504839A1 (en) Catalytic exhaust gas detoxification device
DE2330133C3 (en) Device for cleaning the exhaust gases emitted from an internal combustion engine
DE2419126C3 (en) Post-combustion device for the exhaust gases of a multi-cylinder motor vehicle engine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT CH FR GB IT LI SE

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT CH FR GB IT LI SE

17P Request for examination filed

Effective date: 19860514

17Q First examination report despatched

Effective date: 19860922

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH FR GB IT LI SE

REF Corresponds to:

Ref document number: 30618

Country of ref document: AT

Date of ref document: 19871115

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO MILANO S.P.A.

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PUE

Owner name: VASTAG AUTOMOBILTECHNIK GESELLSCHAFT M.B.H.

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19890714

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19890717

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19890718

Year of fee payment: 5

ITPR It: changes in ownership of a european patent

Owner name: CESSIONE;VOEST - ALPINE AKTIENGESELLSCHAFT

ITPR It: changes in ownership of a european patent

Owner name: CESSIONE;VASTAG AUTOMOBILTECHNIK GESELLSCHAFT MBH

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19890721

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19890731

Year of fee payment: 5

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19900816

Ref country code: AT

Effective date: 19900816

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19900817

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19900831

Ref country code: CH

Effective date: 19900831

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19910430

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 85890185.3

Effective date: 19910410