EP0285027B1 - Arrangement for mounting a catalyst in a casing in the exhaust system of a liquid fuel engine - Google Patents

Arrangement for mounting a catalyst in a casing in the exhaust system of a liquid fuel engine Download PDF

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Publication number
EP0285027B1
EP0285027B1 EP88104839A EP88104839A EP0285027B1 EP 0285027 B1 EP0285027 B1 EP 0285027B1 EP 88104839 A EP88104839 A EP 88104839A EP 88104839 A EP88104839 A EP 88104839A EP 0285027 B1 EP0285027 B1 EP 0285027B1
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EP
European Patent Office
Prior art keywords
sealing strip
arrangement according
catalyst body
supporting member
supporting arrangement
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
EP88104839A
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German (de)
French (fr)
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EP0285027A3 (en
EP0285027A2 (en
Inventor
Georg Wirth
Siegfried Wörner
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.)
Eberspaecher Climate Control Systems GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
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Publication date
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Publication of EP0285027A2 publication Critical patent/EP0285027A2/en
Publication of EP0285027A3 publication Critical patent/EP0285027A3/en
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Publication of EP0285027B1 publication Critical patent/EP0285027B1/en
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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
    • 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
    • F01N3/2839—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
    • F01N3/2867—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 placed at the front or end face of catalyst body
    • 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
    • F01N2350/04—Fitting ceramic monoliths in a metallic housing with means compensating thermal expansion
    • 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
    • F01N2350/06—Fitting ceramic monoliths in a metallic housing with means preventing gas flow by-pass or leakage

Definitions

  • the holding element is continuously a metal knitted fabric, that is also in the section where the sealing strip is arranged.
  • An analog bracket arrangement is also known from document DE-A-35 19 965.
  • the invention has for its object to provide a mounting arrangement of the type mentioned, which is simple to manufacture and assemble, since it is a mass article, and in which the tightness against flowing exhaust gas with simple means in a against destruction of the sealing strip secured way.
  • the sealing strip does not lie on a rough knitted surface, and this prevents the sealing strip from rubbing against the knitting, which could lead to a gradual destruction of the sealing strip and the loss of the sealing effect.
  • the sealing strip in that section of the holding element into which the sealing strip is introduced, viewed in the longitudinal section of the arrangement, there can be smooth, preferably parallel, metallic threads which connect the adjacent knitted parts, these threads being those from which the Knitted fabric is formed.
  • This section runs in the longitudinal direction of the holding element, the width of the holding element roughly corresponding to the length of the catalyst body around which the holding element is wound, specifically in one or more layers.
  • the sealing strip lies transversely to the flow direction of the exhaust gas around the catalyst body.
  • the holding element can be a hose knitted from metallic threads, which is not formed as a knitted fabric on the section for receiving the sealing strip, but instead has straight threads, and which is then pressed together to form a flat, two-layer holding element, the knitting-free sections then with their straight threads lie on top of each other and thus form the section for receiving the sealing element.
  • the holding element can also be designed as a correspondingly long, single-layer element, e.g. with a length equal to or greater than twice the circumference of the catalyst body. In this case, the catalyst body is surrounded by the holding element in such a way that a two-layer coating is produced.
  • a further development of the invention is characterized in that at least one sealing strip is introduced above or below or between the undeformed metallic threads of the knitted fabric.
  • the sealing strip is inserted into the section provided for receiving the sealing strip before the catalyst body is wrapped around, and it can be placed on or under the straight threads.
  • the sealing strip can already be inserted into the section provided for this purpose when the hose is pressed together, so that it lies between the straight threads.
  • a further sealing strip can be placed in the section with the straight threads on the sealing strips already introduced before the catalyst body is wrapped around it, so that a double sealing strip is inserted after the catalyst body has been wrapped.
  • the thickness of the sealing strip can be equal to or less than the height of the corrugation of the knitted fabric at the sections adjacent to the receiving of the sealing strip.
  • an embodiment of the mounting arrangement according to the invention is shown in simplified and schematic form, using the example of mounting a catalytically coated monolith in the exhaust pipe of a vehicle.
  • a body 1 which is a catalytically coated monolith with a large number of very fine longitudinal channels, is to be arranged and held in a pipeline 11, in the present case the exhaust pipe of a vehicle. It should also flow around the body pers 1 with exhaust gas can be prevented as far as possible and the bracket must be sufficient in all operating conditions. Despite the different coefficients of expansion of the housing (steel) and body 1 (ceramic), the holder should be effective at the different temperatures, that is to say in a range from approximately 800 to 900 ° C.
  • the exhaust pipe 11 has an inlet funnel 3a in the direction of flow, to which the cylindrical housing adjoins, in which the body 1 is held.
  • the housing 2 can be connected to the inlet funnel 3a with a larger diameter, so that a contact edge is formed.
  • the outlet funnel 3b connects to the housing 2 with the following pipeline.
  • the housing 2 is either welded to the two funnels 3a, 3b or connected via flanges.
  • the cylindrical housing 2 has circumferential impressions 12 which either run parallel to one another or are stamped in a spiral. This indentation 12 causes the pressing of the holding element 4, which surrounds the body 1.
  • the holding element 4 consists of a 2-ply tubular knitted fabric made of wire with a diameter of 0.23 mm and made of Inconel 601 or Nicrofer 6023 and having a knitted width of 95 mm and 60 stitches, which is compressed into a flat element.
  • the holding element 4 has an arrow-shaped indentation 5 on both sides. This creates a corrugation with a pitch of 10.5 mm and a height of the knitted fabric of 6.5 mm (corrugation h), the arrow path on both sides is 72 to the edge.
  • the holding element 4 is provided in a longitudinal axis 8 with a section 9, in which a sealing strip 10 with the thickness d is inserted.
  • this longitudinal axis 8 runs at right angles to the flow direction of the catalyst to be held.
  • the threads 13 of the knitted fabric 14 run in a straight, undeformed manner, so that they form support webs for the sealing strip (s) 10 or 10a, 10b and contribute to the holding of the sealing strip 10, since in operation these "webs" 13 are in the surface of the sealing strip 10.
  • the sealing strip 10 can also be interwoven with the straight threads 13 of the knitted fabric 14, so that one thread 13 lies above and the next thread 13 lies below the sealing strip 10. This provides a particularly good position fixation of the sealing strip 10 in the holding element 4. A similar effect is obtained with a hose-like holding element 4, which is then compressed into a flat element, if the sealing strip 10 is inserted into the section 9 provided for the sealing strip 10 before it is pressed together. In this case, there is a layer of the threads 13 and a layer under the sealing strip 10.
  • the section 9 does not need to be arranged in the center, as shown in the figures, but can also run eccentrically in the longitudinal direction of the holding element 4, namely parallel to the longitudinal direction or obliquely thereto.
  • the holding element 4 is wider than the length of the body 1, so that it protrudes on these two end faces when enveloping the body 1. After assembly, these projecting sections lie over the respective front edge of the body 1 and form both an edge protector and a first seal against flow around the body 1 by the exhaust gas.
  • the arrow-shaped impressions 5 result in a better mounting of the body 1 and in particular prevents an oblique displacement of the body 1. Furthermore, this measure interrupts the flow path for the exhaust gas and thus also provides a sealing effect.
  • the threads 13 of the knitted fabric 14 in section 9 can alternatively be deformed in the development plane of FIG. 2, but they are not bent out of this plane and are therefore not deformed there into the corrugated knitted shape.
  • the threads 13 of the knitted fabric 14 can be provided in the section 9, in contrast to that shown in FIG. Then a sealing ring 10a is sufficient radially outside of section 9. Another alternative is to provide the threads 13 lying radially on the outside of the housing 2, so that a radially inner sealing ring 10b is sufficient.
  • the sealing strip 10 can either be attached together with the attachment of the holding element 4 or after the attachment of the holding element 4.
  • the possibility of retrofitting also exists if the holding element 4 is attached to the catalyst body 1 by simply or repeatedly wrapping it around, in particular in the sequence of operations that the holding element 4 is first wrapped around the catalyst body 1 approximately twice and only after that a sealing strip 10 from is inserted from the outside in section 9.
  • the procedure can be such that the threads 13 are pressed inwards against the catalyst body 1 by inserting the sealing strip 10. This inward pressing of the threads 13 can also take place in the case shown in FIG. 1, in which the threads 13 per se radially approximately in the middle between the catalyst body 1 and the Ge house 2 lie.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Catalysts (AREA)

Description

Die Erfindung bezieht sich auf eine Halterungsanordnung eines Katalysatorkörpers in einem Gehäuse für das Abgassystem eines Flüssigbrennstoff-Verbrennungsmotors, aufweisend:

  • (a) ein den Katalysatorkörper in seiner Einbaulage in dem Gehäuse haltendes, durch Einprägungen gewelltes Halteelement aus verstrickten Metallfäden, das mindestens einlagig um den Katalysatorkörper gelegt ist; und
  • (b) mindestens einen um den Katalysatorkörper herumführenden Dichtstreifen, der in einem ungewellten Abschnitt des Halteelements aufgenommen ist, um den Katalysatorkörper gegenüber umströmendem Abgas abzudichten.
The invention relates to a mounting arrangement of a catalyst body in a housing for the exhaust system of a liquid fuel internal combustion engine, comprising:
  • (a) a holding element made of knitted metal threads which holds the catalyst body in its installed position in the housing and is corrugated by embossments and which is laid at least in one layer around the catalyst body; and
  • (b) at least one sealing strip which extends around the catalyst body and is received in an non-corrugated section of the holding element in order to seal the catalyst body against exhaust gas flowing around.

Bei einer bekannten Halterungsanordnung dieser Art (US-A-4 500 099) ist das Halteelement durchgehend ein Metallgestrick, also auch in demjenigen Abschnitt, wo der Dichtstreifen angeordnet ist. Eine analoge Halterungsanordnung ist auch aus dem Dokument DE-A-35 19 965 bekannt.In a known holder arrangement of this type (US-A-4 500 099), the holding element is continuously a metal knitted fabric, that is also in the section where the sealing strip is arranged. An analog bracket arrangement is also known from document DE-A-35 19 965.

Der Erfindung liegt die Aufgabe zugrunde, eine Halterungsanordnung der eingangs genannten Art verfügbar zu machen, welche in Herstellung und Montage einfach ist, da es sich um einen Massenartikel handelt, und bei welcher die Dichtheit gegen umströmendes Abgas mit einfachen Mitteln in einer gegen Zerstörung des Dichtstreifens gesicherten Weise erfolgt.The invention has for its object to provide a mounting arrangement of the type mentioned, which is simple to manufacture and assemble, since it is a mass article, and in which the tightness against flowing exhaust gas with simple means in a against destruction of the sealing strip secured way.

Der Dichtstreifen liegt nicht auf einer rauhen Gestrickfläche auf, und damit ist ein Reiben des Dichtstreifens an dem Gestrick, was zu einer allmählichen Zerstörung des Dichtstreifens und dem Verlust der Dichtwirkung führen könnte, vermieden.The sealing strip does not lie on a rough knitted surface, and this prevents the sealing strip from rubbing against the knitting, which could lead to a gradual destruction of the sealing strip and the loss of the sealing effect.

Bei der Erfindung können in demjenigen Abschnitt des Halteelements, in den der Dichtstreifen eingebracht wird, - im Längsschnitt der Anordnung betrachtet - glatte und vorzugsweise parallel zueinander liegende, metallische Fäden liegen, welche die benachbarten Gestrickteile verbinden, wobei diese Fäden solche sind, aus denen das Gestrick gebildet ist. Dieser Abschnitt verläuft in Längrichtung des Halteelements, wobei die Breite des Halteelements in etwa der Länge des Katalysatorkörpers entspricht, um den das Halteelement gewikkelt ist, und zwar einlagig oder mehrlagig. Dadurch liegt der Dichtstreifen quer zur Umströmrichtung des Abgases um den Katalysatorkörper.In the invention, in that section of the holding element into which the sealing strip is introduced, viewed in the longitudinal section of the arrangement, there can be smooth, preferably parallel, metallic threads which connect the adjacent knitted parts, these threads being those from which the Knitted fabric is formed. This section runs in the longitudinal direction of the holding element, the width of the holding element roughly corresponding to the length of the catalyst body around which the holding element is wound, specifically in one or more layers. As a result, the sealing strip lies transversely to the flow direction of the exhaust gas around the catalyst body.

Das Halteelement kann in bekannter Weise ein aus metallischen Fäden gestrickter Schlauch sein, der an dem Abschnitt zur Aufnahme des Dichtstreifens nicht als Gestrick ausgebildet ist, sondern gerade Fäden aufweist, und der dann zu einem ebenen, zweilagigen Halteelement zusammengepreßt ist, wobei die gestrickfreien Abschnitte dann mit ihren geraden Fäden aufeinanderliegen und so den Abschnitt für die Aufnahme des Dichtelements bilden. Das Halteelement kann aber auch als entsprechend langes, einlagiges Element ausgebildet sein, z.B. mit einer Länge, die gleich oder größer dem doppelten Umfang des Katalysatorkörpers ist. In diesem Fall wird der Katalysatorkörper so von dem Halteelement umgeben, daß eine zweilagige Umhüllung entsteht.In a known manner, the holding element can be a hose knitted from metallic threads, which is not formed as a knitted fabric on the section for receiving the sealing strip, but instead has straight threads, and which is then pressed together to form a flat, two-layer holding element, the knitting-free sections then with their straight threads lie on top of each other and thus form the section for receiving the sealing element. The holding element can also be designed as a correspondingly long, single-layer element, e.g. with a length equal to or greater than twice the circumference of the catalyst body. In this case, the catalyst body is surrounded by the holding element in such a way that a two-layer coating is produced.

Um zu einer besonders wirksamen Abdichtung zu gelangen, ist eine Weiterbildung der Erfindung dadurch gekennzeichnet, daß mindestens je ein Dichtstreifen über bzw. unter oder zwischen den nicht verformten metallischen Fäden des Gestricks eingebracht ist. Bei einem ebenen einlagigen Halteelement, das einlagig oder mehrlagig um den Katalysatorkörper gewickelt wird, wird der Dichtstreifen vor dem Umwickeln des Katalysatorkörpers in den für die Aufnahme des Dichtstreifens vorgesehenen Abschnitt eingelegt, wobei er auf die geraden Fäden oder unter diese gelegt werden kann. Bei einem aus einem zusammengepreßten Schlauch gebildeten Halteelement kann der Dichtstreifen bei dem Zusammenpressen des Schlauchs bereits in den hierfür vorgesehenen Abschnitt eingelegt werden, so daß er zwischen den geraden Fäden liegt. Bei Bedarf kann ein weiterer Dichtstreifen vor dem Umwickeln des Katalysatorkörpers in dem Abschnitt mit den geraden Fäden auf den bereits eingebrachten Dichtstreifen aufgelegt werden, so daß nach der Umhüllung des Katalysatorkörpers ein doppelter Dichtstreifen einliegt. Die Dicke des Dichtstreifens kann gleich oder kleiner der Höhe der Wellung des Gestricks an den der Aufnahme des Dichtstreifens benachbarten Abschnitten sein.In order to achieve a particularly effective seal, a further development of the invention is characterized in that at least one sealing strip is introduced above or below or between the undeformed metallic threads of the knitted fabric. In the case of a flat, single-layer holding element which is wound around the catalyst body in one or more layers, the sealing strip is inserted into the section provided for receiving the sealing strip before the catalyst body is wrapped around, and it can be placed on or under the straight threads. In the case of a holding element formed from a compressed hose, the sealing strip can already be inserted into the section provided for this purpose when the hose is pressed together, so that it lies between the straight threads. If required, a further sealing strip can be placed in the section with the straight threads on the sealing strips already introduced before the catalyst body is wrapped around it, so that a double sealing strip is inserted after the catalyst body has been wrapped. The thickness of the sealing strip can be equal to or less than the height of the corrugation of the knitted fabric at the sections adjacent to the receiving of the sealing strip.

Mit der Erfindung wird mit einfachen Mitteln eine zuverlässige Halterung des Katalylsatorkörpers trotz unterschiedlicher Ausdehnung von Katalysatorkörper und Gehäuse sowie eine beständige Dichtung gegen den Katalysatorkörper umströmendes Abgas erreicht, wobei der Dichtstreifen gegen Abrieb und damit Zerstörung in einfacher Weise geschützt ist.With the invention, a reliable mounting of the catalyst body is achieved with simple means in spite of different expansion of the catalyst body and housing and a permanent seal against exhaust gas flowing around the catalyst body, the sealing strip being protected against abrasion and thus destruction in a simple manner.

In den Fig. 1, 2 und 3 ist ein Ausführungsbeispiel der erfindungsgemäßen Halterungsanordnung vereinfacht und schematisch dargestellt, und zwar am Beispiel der Halterung eines katalytisch beschichteten Monolithen in der Abgasleitung eines Fahrzeugs.1, 2 and 3, an embodiment of the mounting arrangement according to the invention is shown in simplified and schematic form, using the example of mounting a catalytically coated monolith in the exhaust pipe of a vehicle.

Es zeigt Fig. 1 schematisch einen Längsschnitt der Halterungsanordnung

  • Fig. 2 die Abwicklung des Halteelements und
  • Fig. 3 einen Querschnitt des Halteelements.
1 schematically shows a longitudinal section of the mounting arrangement
  • Fig. 2, the handling of the holding element and
  • Fig. 3 shows a cross section of the holding element.

Bei dem Ausführungsbeispiel soll ein Körper 1, der ein katalytisch beschichteter Monolith mit einer Vielzahl sehr feiner Längskanäle ist, in einer Rohrleitung 11, im vorliegenden Fall der Abgasleitung eines Fahrzeuges, angeordnet sein und gehalten werden. Es soll ferner die Umströmung des Körpers 1 mit Abgas weitestgehend verhindert werden und die Halterung bei allen Betriebszuständen ausreichend sein. Die Halterung soll trotz der unterschiedlichen Ausdehnungskoeffizienten von Gehäuse (Stahl) und Körper 1 (Keramik) bei den unterschiedlich auftretenden Temperaturen, also bis in einem Bereich von etwa 800 bis 900 ° C, wirksam sein.In the exemplary embodiment, a body 1, which is a catalytically coated monolith with a large number of very fine longitudinal channels, is to be arranged and held in a pipeline 11, in the present case the exhaust pipe of a vehicle. It should also flow around the body pers 1 with exhaust gas can be prevented as far as possible and the bracket must be sufficient in all operating conditions. Despite the different coefficients of expansion of the housing (steel) and body 1 (ceramic), the holder should be effective at the different temperatures, that is to say in a range from approximately 800 to 900 ° C.

Die Abgasleitung 11 weist in Strömungsrichtung einen Einlauftrichter 3a auf, an dem sich das zylindrische Gehäuse anschließt, in welchem der Körper 1 gehalten ist. Das Gehäuse 2 kann an den Einlauftrichter 3a mit größerem Durchmesser angeschlossen sein, so daß sich eine Anlegekante ausbildet. An das Gehäuse 2 schließt sich entsprechend der Auslauftrichter 3b mit der folgenden Rohrleitung an. Das Gehäuse 2 ist mit den beiden Trichtern 3a, 3b entweder verschweißt oder über Flansche verbunden. Das zylindrische Gehäuse 2 hat auf dem Umfang umlaufende Einprägungen 12, die entweder parallel zueinander verlaufen oder spiralförmig eingeprägt sind. Diese Einprägung 12 bewirkt die Verpressung des Halteelementes 4, das den Körper 1 umgibt. Das Halteelement 4 besteht aus einem zu einem ebenen Element zusammengepreßten 2-fädrigen Schlauchgestrick aus Draht von 0,23 mm Durchmesser aus dem Werkstoff Inconel 601 oder Nicrofer 6023 mit einer Gestrickbreite von 95 mm bei 60 Maschen. Das Halteelement 4 hat beiderseits eine pfeilförmige Einprägung 5. Dabei entsteht eine Wellung mit einer Teilung von 10,5 mm bei einer Höhe des Gestrikkes von 6,5 mm (Wellung h), der Pfeilverlauf beträgt beiderseitig 72 zur Kante. An beiden Randbereichen 6a, 6b erfolgt ein Randumschlag an den Längsaußenkanten 7a, 7b von 18 mm, so daß in diesen beiden Bereichen die doppelte Lagenzahl besteht. Ferner ist das Halteelement 4 in einer Längsachse 8 mit einem Abschnitt 9 versehen, in welchem ein Dichtstreifen 10 mit der Dicke d eingelegt ist. Im eingebauten Zustand verläuft diese Längsachse 8 rechtwinklig zur Durchströmrichtung des zu haltenden Katalysators. In dem Abschnitt 9 verlaufen die Fäden 13 des Gestrickes 14 unverformt geradlinig, so daß sie Auflagestege für den oder die Dichtstreifen 10 bzw. 10a, 10b bilden und zur Halterung des Dichtstreifens 10 beitragen, da im Betrieb diese "Stege" 13 sich in die Oberfläche des Dichtstreifens 10 einpressen.The exhaust pipe 11 has an inlet funnel 3a in the direction of flow, to which the cylindrical housing adjoins, in which the body 1 is held. The housing 2 can be connected to the inlet funnel 3a with a larger diameter, so that a contact edge is formed. The outlet funnel 3b connects to the housing 2 with the following pipeline. The housing 2 is either welded to the two funnels 3a, 3b or connected via flanges. The cylindrical housing 2 has circumferential impressions 12 which either run parallel to one another or are stamped in a spiral. This indentation 12 causes the pressing of the holding element 4, which surrounds the body 1. The holding element 4 consists of a 2-ply tubular knitted fabric made of wire with a diameter of 0.23 mm and made of Inconel 601 or Nicrofer 6023 and having a knitted width of 95 mm and 60 stitches, which is compressed into a flat element. The holding element 4 has an arrow-shaped indentation 5 on both sides. This creates a corrugation with a pitch of 10.5 mm and a height of the knitted fabric of 6.5 mm (corrugation h), the arrow path on both sides is 72 to the edge. At both edge areas 6a, 6b there is an edge change of 18 mm on the longitudinal outer edges 7a, 7b, so that there is double the number of layers in these two areas. Furthermore, the holding element 4 is provided in a longitudinal axis 8 with a section 9, in which a sealing strip 10 with the thickness d is inserted. In the installed state, this longitudinal axis 8 runs at right angles to the flow direction of the catalyst to be held. In section 9, the threads 13 of the knitted fabric 14 run in a straight, undeformed manner, so that they form support webs for the sealing strip (s) 10 or 10a, 10b and contribute to the holding of the sealing strip 10, since in operation these "webs" 13 are in the surface of the sealing strip 10.

In Fällen besonderer Belastung kann der Dichtstreifen 10 auch mit den geraden Fäden 13 des Gestrickes 14 verwoben werden, so daß jeweils ein Faden 13 oberhalb und der nächstfolgende Faden 13 unterhalb des Dichtstreifens 10 liegt. Damit ist eine besonders gute Lagefixierung des Dichtstreifens 10 in dem Halteelement 4 gegeben. Ein ähnlicher Effekt ergibt sich bei einem schlauchartigen und dann zu einem ebenen Element zusammengepreßten Halteelement 4, wenn der Dichtstreifen 10 vor dem Zusammenpressen in den für den Dichtstreifen 10 vorgesehenen Abschnitt 9 eingelegt wird. In diesem Fall liegt eine Lage der Fäden 13 auf und eine Lage unter dem Dichtstreifen 10.In cases of particular stress, the sealing strip 10 can also be interwoven with the straight threads 13 of the knitted fabric 14, so that one thread 13 lies above and the next thread 13 lies below the sealing strip 10. This provides a particularly good position fixation of the sealing strip 10 in the holding element 4. A similar effect is obtained with a hose-like holding element 4, which is then compressed into a flat element, if the sealing strip 10 is inserted into the section 9 provided for the sealing strip 10 before it is pressed together. In this case, there is a layer of the threads 13 and a layer under the sealing strip 10.

Der Abschnitt 9 braucht nicht wie in den Figuren dargestellt mittig angeordnet sein, sondern kann auch außermittig in Längsrichtung des Halteelementes 4 verlaufen und zwar parallel zur Längsrichtung oder schräg hierzu.The section 9 does not need to be arranged in the center, as shown in the figures, but can also run eccentrically in the longitudinal direction of the holding element 4, namely parallel to the longitudinal direction or obliquely thereto.

Das Halteelement 4 ist breiter als die Länge des Körpers 1, so daß es beim Umhüllen des Körpers 1 an diesen beiden Stirnseiten überragt. Nach dem Zusammenbau legen sich diese überragenden Abschnitte über die jeweilige stirnseitige Kante des Körpers 1 und bilden sowohl einen Kantenschutz als auch eine erste Abdichtung gegen Umströmung des Körpers 1 durch das Abgas. Durch die pfeilförmigen Einprägungen 5 ergibt sich eine bessere Halterung des Körpers 1 und sie verhindert insbesondere eine Schrägverschiebung des Körpers 1. Ferner ist durch diese Maßnahme eine Unterbrechung des Strömungsweges für das Abgas und damit ebenfalls eine Dichtwirkung gegeben.The holding element 4 is wider than the length of the body 1, so that it protrudes on these two end faces when enveloping the body 1. After assembly, these projecting sections lie over the respective front edge of the body 1 and form both an edge protector and a first seal against flow around the body 1 by the exhaust gas. The arrow-shaped impressions 5 result in a better mounting of the body 1 and in particular prevents an oblique displacement of the body 1. Furthermore, this measure interrupts the flow path for the exhaust gas and thus also provides a sealing effect.

Die Fäden 13 des Gestrickes 14 im Abschnitt 9 können alternativ in der Abwicklungsebene der Fig. 2 verformt sein, wobei sie aber nicht aus dieser Ebene herausgebogen sind und daher dort nicht in die Wellgestrickform verformt sind.The threads 13 of the knitted fabric 14 in section 9 can alternatively be deformed in the development plane of FIG. 2, but they are not bent out of this plane and are therefore not deformed there into the corrugated knitted shape.

Die Fäden 13 des Gestrickes 14 können in dem Abschnitt 9, anders als in Fig. 1 dargestellt, in einer Fläche unmittelbar anliegend an dem Katalysatorkörper 1 vorgesehen sein. Dann reicht ein Dichtring 10a radial außerhalb des Abschnitts 9 aus. Eine weitere Alternative besteht darin, die Fäden 13 radial außen anliegend an dem Gehäuse 2 vorzusehen, so daß ein radial innerer Dichtring 10b ausreicht.The threads 13 of the knitted fabric 14 can be provided in the section 9, in contrast to that shown in FIG. Then a sealing ring 10a is sufficient radially outside of section 9. Another alternative is to provide the threads 13 lying radially on the outside of the housing 2, so that a radially inner sealing ring 10b is sufficient.

Der Dichtstreifen 10 kann entweder zusammen mit der Anbringung des Halteelements 4 oder nachträglich nach Anbringung des Halteelements 4 angebracht werden. Die Möglichkeit des nachträglichen Anbringens besteht auch, wenn das Halteelement 4 durch einfaches oder mehrfaches Herumwickeln um den Katalysatorkörper 1 angebracht wird, insbesondere in der Arbeitsabfolge, daß das Halteelement 4 zunächst etwa zweifach um den Katalysatorkörper 1 herumgewickelt wird und daß erst danach ein Dichtstreifen 10 von außen her in den Abschnitt 9 eingelegt wird. Dabei kann so vorgegangen werden, daß die Fäden 13 durch das Einlegen des Dichtstreifens 10 nach innen an den Katalysatorkörper 1 herangedrückt werden. Dieses Nach-innen-Drücken der Fäden 13 kann auch in dem in Fig. 1 dargestellten Fall stattfinden, bei dem die Fäden 13 an sich radial etwa in der Mitte zwischen dem Katalysatorkörper 1 und dem Gehäuse 2 liegen.The sealing strip 10 can either be attached together with the attachment of the holding element 4 or after the attachment of the holding element 4. The possibility of retrofitting also exists if the holding element 4 is attached to the catalyst body 1 by simply or repeatedly wrapping it around, in particular in the sequence of operations that the holding element 4 is first wrapped around the catalyst body 1 approximately twice and only after that a sealing strip 10 from is inserted from the outside in section 9. The procedure can be such that the threads 13 are pressed inwards against the catalyst body 1 by inserting the sealing strip 10. This inward pressing of the threads 13 can also take place in the case shown in FIG. 1, in which the threads 13 per se radially approximately in the middle between the catalyst body 1 and the Ge house 2 lie.

Zur Erreichung der doppelten Lagenzahl des Gestrickes 14 an dessen beiden Rändern besteht ferner die Möglichkeit, daß Schlauchgestrick vor dem Flachdrücken an beiden Rändern nach innen einzustülpen und erst dann das Flachdrücken vorzunehmen. Auf diese Weise hat man nicht einen Randumschlag, der radial außen oder radial innen auf dem Halteelement 4 liegt, sondern eine zusammengedrückte Randeinstülpung, bei der das Gestrick 14 am Axialende des Halteelements 4 zunächst um 180" zurückgefaltet ist und in Richtung zur axialen Mitte des Halteelements 4 verläuft, dann wiederum um 180" nach vorn gefaltet ist und zum axialen Rand des Halteelements 4 verläuft, und dann schließlich wiederum um 180" zurückgefaltet ist und so zum anderen Axialende des Halteelements 4 verläuft.In order to achieve double the number of layers of the knitted fabric 14 on its two edges, there is also the possibility of inserting the tubular knitted fabric inwards on both edges before the flattening and only then performing the flattening. In this way, one does not have an edge fold that lies radially outside or radially inside on the holding element 4, but a compressed edge indentation in which the knitted fabric 14 at the axial end of the holding element 4 is first folded back by 180 "and in the direction of the axial center of the holding element 4 runs, then again is folded forward by 180 "and runs to the axial edge of the holding element 4, and then is finally folded back again by 180" and thus runs to the other axial end of the holding element 4.

Claims (12)

1. A supporting arrangement of a catalyst body (1) in a casing (2) for the exhaust system of a liquid fuel combustion engine, comprising:
(a) a supporting member (4) of knitted metal threads, holding the catalyst body (1) in its position of installation in the casing (2) and being corrugated by indentations, with said supporting member (4) being placed around the catalyst body (1) in at least one layer; and
(b) at least one sealing strip (10) extending around the catalyst body (1) and received in a non-corrugated section (9) of the supporting member (4) for sealing the catalyst body (1) with respect to exhaust gas flowing therearound,

characterized in that the supporting member section (9) in which the sealing strip (10) is disposed consists of metal threads (13) which are unknitted in said section (9).
2. A supporting arrangement according to claim 1,
characterized in that the metal threads (13) in said section (9) extend rectilinear and parallel to each other in the longitudinal direction of the catalyst body (1).
3. A supporting arrangement according to claim 1 or 2,
characterized in that the sealing strip (10) is applied on the outside of the unknitted metal threads (13) or on the inside of the unknitted metal threads (13) or is woven into the unknitted metal threads (13).
4. A supporting arrangement according to any one of claims 1 to 3,
characterized in that the unknitted metal threads (13) are located only on the inside or only on the outside of the sealing strip (10).
5. A supporting arrangement according to claim 1 or 2,
characterized in that a first sealing strip (10a) is applied on the outside of the unknitted metal threads (13) and a second sealing strip (10b) is appliedd on the inside of the unknitted metal threads (13).
6. A supporting arrangement according to any one of claims 1 to 5,
characterized in that the sealing strip (10) is applied from the outside subsequently, after the supporting member (4) has been placed around the catalyst body (1).
7. A supporting arrangement according to any one of claims 1 to 6,
characterized in that the sealing strip (10) is applied simultaneously with the placement of the supporting member (4) around the catalyst body (1).
8. A supporting arrangement according to any one of claims 1 to 7,
characterized in that the thickness (d) of the sealing strip (10) is equal to or smaller than the corrugation height (h) of the supporting member (4).
9. A supporting arrangement according to any one of claims 1 to 8,
characterized in that the corrugation indentations (5) of the supporting member (4) extend at an angle with respect to the longitudinal direction of the catalyst body (1).
10. A supporting arrangement according to any one of claims 1 to 9,
characterized in that the two edge portions (6a, 6b) of the supporting member (4) are formed with an inverted edge of the knit (14).
11. A supporting arrangement according to any one of claims 1 to 10,
characterized in that the supporting member (4) consists of an originally tubular knit (14) which is then compressed to form a sheet-like shape.
12. A supporting arrangement according to claim 11,
characterized in that the originally tubular knit (14) has been turned inwardly in the two edge portions (6a, 6b), so that four-layered portions are formed there after compression.
EP88104839A 1987-03-28 1988-03-25 Arrangement for mounting a catalyst in a casing in the exhaust system of a liquid fuel engine Expired - Lifetime EP0285027B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3710299 1987-03-28
DE19873710299 DE3710299A1 (en) 1987-03-28 1987-03-28 ARRANGEMENT FOR HOLDING A CATALYST IN A HOUSING IN THE EXHAUST SYSTEM OF A ENGINE USED WITH LIQUID FUEL

Publications (3)

Publication Number Publication Date
EP0285027A2 EP0285027A2 (en) 1988-10-05
EP0285027A3 EP0285027A3 (en) 1989-05-10
EP0285027B1 true EP0285027B1 (en) 1992-07-15

Family

ID=6324236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104839A Expired - Lifetime EP0285027B1 (en) 1987-03-28 1988-03-25 Arrangement for mounting a catalyst in a casing in the exhaust system of a liquid fuel engine

Country Status (5)

Country Link
US (1) US4958491A (en)
EP (1) EP0285027B1 (en)
CZ (1) CZ278210B6 (en)
DE (3) DE3710299A1 (en)
ES (1) ES2033968T3 (en)

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DE3929205A1 (en) * 1989-09-02 1991-03-21 Leistritz Ag EXHAUST APPARATUS, IN PARTICULAR. EXHAUST GAS PURIFICATION DEVICE
DE4218198C2 (en) * 1992-06-03 1994-08-18 Manfred Sagitzki Catalytic converter housing
DE4305198C1 (en) * 1993-02-19 1994-05-11 Zeuna Staerker Kg Catalytic exhaust gas cleaning device - has expansible laminate with inner layer gap at interspace between adjacent catalyst bodies
SE9301653D0 (en) * 1993-05-14 1993-05-14 Filterprodukter Ab CATALYST CARRIER AND APPLICATION OF THIS
JP3216545B2 (en) * 1996-01-26 2001-10-09 トヨタ自動車株式会社 Exhaust purification catalyst device for internal combustion engine
US6017498A (en) 1998-01-14 2000-01-25 Metex Mfg. Corporation Catalytic converter support device
EP1236872B1 (en) * 2001-02-20 2003-12-17 Zeuna-Stärker Gmbh & Co Kg Exhaust gas cleaning device
FR2825117A1 (en) * 2001-05-28 2002-11-29 Faurecia Sys Echappement Exhaust part for exhaust line comprises casing with porous substrate in main section and retaining layer surrounding substrate, internal transverse stops axially support substrate ends
US7378060B2 (en) * 2005-02-04 2008-05-27 Ford Global Technologies, Llc Support seal for positive retention of catalytic converter substrate and method therefor
AU2017244041B2 (en) 2016-03-30 2022-12-01 Marine Canada Acquisition Inc. Vehicle heater and controls therefor
US10480387B2 (en) * 2017-02-08 2019-11-19 Caterpillar Inc. Housing for aftertreatment systems

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Also Published As

Publication number Publication date
EP0285027A3 (en) 1989-05-10
DE3710299A1 (en) 1988-10-13
DE8717839U1 (en) 1990-05-31
US4958491A (en) 1990-09-25
ES2033968T3 (en) 1993-04-01
DE3710299C2 (en) 1990-11-22
CZ278210B6 (en) 1993-10-13
CZ204788A3 (en) 1993-05-12
DE3872743D1 (en) 1992-08-20
EP0285027A2 (en) 1988-10-05

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