EP0277477B1 - Metallic catalyst support having a short tubular casing - Google Patents

Metallic catalyst support having a short tubular casing Download PDF

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Publication number
EP0277477B1
EP0277477B1 EP88100077A EP88100077A EP0277477B1 EP 0277477 B1 EP0277477 B1 EP 0277477B1 EP 88100077 A EP88100077 A EP 88100077A EP 88100077 A EP88100077 A EP 88100077A EP 0277477 B1 EP0277477 B1 EP 0277477B1
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EP
European Patent Office
Prior art keywords
catalyst carrier
carrier body
casing tube
end surfaces
brazed
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
EP88100077A
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German (de)
French (fr)
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EP0277477A1 (en
Inventor
Wolfgang Dipl.-Ing. Maus
Theodor Dipl.-Ing. Cyron
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.)
Vitesco Technologies Lohmar Verwaltungs GmbH
Original Assignee
Emitec Gesellschaft fuer Emissionstechnologie mbH
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Priority to AT88100077T priority Critical patent/ATE52836T1/en
Publication of EP0277477A1 publication Critical patent/EP0277477A1/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
    • 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
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807—Metal other than sintered metal
    • F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/08—Exhaust treating devices having provisions not otherwise provided for for preventing heat loss or temperature drop, using other means than layers of heat-insulating material
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/10—Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
    • F01N2330/04—Methods of manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49345—Catalytic device making

Definitions

  • the present invention relates to a metallic catalyst carrier body according to the preamble of claim 1.
  • Such catalyst carrier bodies which are preferably used for exhaust gas purification of motor vehicles, are known, for example, from DE-A 2 924 592, DE-A 3 037 796 and DE-A 3 529 654 known. They are made, for example, of spirally superimposed, alternating corrugated and smooth or similarly structured metal sheets and are generally provided with a jacket tube.
  • a catalyst carrier body which has a tubular casing which is shorter on one side than the actual catalyst carrier body.
  • This embodiment is provided in particular as a so-called starting catalytic converter, which is installed close to the motor and is therefore exposed to high thermal loads.
  • the entire length of the jacket tube is soldered to the outermost layer of the catalyst carrier body and completely encloses at least one likewise soldered end face.
  • Such a catalyst carrier body is hampered in its axial and radial expansion or in a so-called growth occurring in these directions by the jacket tube, which can lead to premature destruction.
  • DE-A 2 746 475 also describes the mounting of a catalyst carrier body, which enables free expansion, with a tensioning strap.
  • this type of attachment is not very stable in terms of vibrations in the exhaust gas flow and mechanical shocks.
  • the fastening of the tension band on the casing tube causes manufacturing difficulties.
  • the casing tube can practically only be limited to the area of the soldered peripheral zone. It then surrounds the much longer catalyst carrier body in a ring shape.
  • This version is of course only suitable for later installation conditions, in which a protective cladding tube is attached anyway, which e.g. is generally the case with starting catalysts.
  • the usual pipes of the exhaust system of an internal combustion engine can be easily welded onto a jacket pipe shortened to a narrow ring, so that a closed system is created overall. When the exhaust system is finished, the soldered end faces of the catalyst carrier body then project freely into the subsequent pipelines or are supported by them.
  • the jacket tube has a slightly gaping longitudinal slot, which is preferably bridged by welding only in one area and is thereby fixed.
  • a longitudinally slotted jacket tube enables the production of an exact, precisely defined soldered peripheral zone between the jacket tube and the outermost layer of the catalyst carrier body in a particularly simple manner. While according to the prior art, solder was always distributed in an undefined manner when the jacket tube was pushed on, this can be avoided with a slotted jacket tube.
  • the desired circumferential zone to be soldered is provided with solder, for example in the form of powder, paste or foil, and then at its longitudinal slot spread on casing tube pushed on without smearing the solder.
  • solder for example in the form of powder, paste or foil
  • this manufacturing process prevents the outer layers from being crumpled or deformed, which would have a particularly negative effect in the case of a shortened jacket tube, since the crumpled layers would survive indefinitely on both sides.
  • the jacket tube can be brought to the desired diameter exactly in a suitable calibration device and fixed, for example, by a welding point. The remaining manufacturing steps are not affected by this measure.
  • the end faces can be soldered before or after these steps.
  • the actual catalyst carrier body 1 consists of alternating layers of spirally wound smooth 2 and corrugated 3 sheets. Metal sheets with a different structure, which form channels which are permeable to gas, are also suitable for the present invention.
  • the catalyst carrier body 1 is soldered on the face side to a depth t 1 or t 2 , the entire end faces not necessarily, but possibly only certain areas thereof having to be soldered.
  • the catalyst carrier body 1 is surrounded by a shortened jacket tube 4, which ends on both sides with a distance a 1 or a 2 in front of the end faces. The two distances a i , a 2 do not necessarily have to be the same size.
  • the casing tube 4 is completely or preferably only soldered to the outermost layer of the catalyst carrier body 1 in a narrow peripheral region 5.
  • the casing tube 4 can have a longitudinal slot 6 (which does not necessarily have to run exactly in the longitudinal direction), which is preferably fixed at one point by a welded connection 7.
  • the design according to the invention does not impede the thermal radial alternating expansion of the soldered ends, which increases the service life.
  • the slotted jacket tube enables the precise fixing and production of a narrow soldered peripheral area, which means that changes in the length of the catalyst carrier body are not hindered, which also has a favorable effect on the service life.
  • the slotted casing tube prevents the outer layers from being crumpled or shifted when being pushed open, without the need for complex other measures.
  • a catalyst carrier body according to the invention with a shortened jacket tube is particularly suitable for use as a starting catalyst in the area near the engine under high thermal alternating loads.

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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)

Abstract

1. Metal catalyst carrier body (1) with a honey-comb structure formed from textured metal sheets (2, 3) and through which gas can flow, said honey-comb structure being surrounded by a casing tube (4) which is shorter than the catalyst carrier body (1), characterised by the following features : a) the end surfaces of the catalyst carrier body (1) are brazed at least over a portion of said end surfaces as far as a given depth (t1 , t2 ), preferably a few millimeters ; b) the casing tube (4) ends before the two end surfaces at a given distance (a1 , a2 ) away, this being greater than the brazing depth (t1 , t2 ), preferably a distance of 5 to 40 mm ; c) the casing tube (4) is only brazed to the outermost layer of the catalyst carrier body (1) over a narrow circumferential zone (5) and extends annularly over approximately only this circumferential zone (5).

Description

Die vorliegende Erfindung betrifft einen metallischen Katalysator-Trägerkörper gemäß dem Oberbegriff des Anspruchs 1. Solche Katalysator-Trägerkörper, welche vorzugsweise zur Abgasreinigung von Kraftfahrzeugen eingesetzt werden, sind beispielsweise aus der DE-A 2 924 592, der DE-A 3 037 796 und der DE-A 3 529 654 bekannt. Sie werden beispielsweise aus spiralig übereinandergewickeiten, abwechselnden gewellten und glatten oder ähnlich strukturierten Blechen hergestellt und im allgemeinen mit einem Mantelrohr versehen.The present invention relates to a metallic catalyst carrier body according to the preamble of claim 1. Such catalyst carrier bodies, which are preferably used for exhaust gas purification of motor vehicles, are known, for example, from DE-A 2 924 592, DE-A 3 037 796 and DE-A 3 529 654 known. They are made, for example, of spirally superimposed, alternating corrugated and smooth or similarly structured metal sheets and are generally provided with a jacket tube.

Aus der DE-A 3 603 882 ist auch schon ein Katalysator-Trägerkörper bekannt, welcher ein Mantelrohr aufweist, welches einseitig kürzer als der eigentliche Katalysator-Trägerkörper ist. Diese Ausführungsform ist insbesondere als sogenannter Startkatalysator vorgesehen, welcher motomah eingebaut wird und daher hohen thermischen Belastungen ausgesetzt ist. Nach dem Stand der Technik ist jedoch das Mantelrohr auf seiner gesamten Länge mit der äußersten Lage des Katalysator-Trägerkörpers verlötet und umschließt zumindest eine ebenfalls verlötete Stirnseite vollständig. Ein solcher Katalysator-Trägerkörper ist in seiner axialen und radialen Dehnung bzw. einem in diesen Richtungen auftretenden sogenannten Wachstum durch das Mantelrohr behindert, wehalb es zu vorzeitigen Zerstörungen kommen kann.From DE-A 3 603 882 a catalyst carrier body is already known which has a tubular casing which is shorter on one side than the actual catalyst carrier body. This embodiment is provided in particular as a so-called starting catalytic converter, which is installed close to the motor and is therefore exposed to high thermal loads. According to the prior art, however, the entire length of the jacket tube is soldered to the outermost layer of the catalyst carrier body and completely encloses at least one likewise soldered end face. Such a catalyst carrier body is hampered in its axial and radial expansion or in a so-called growth occurring in these directions by the jacket tube, which can lead to premature destruction.

In der DE-A 2 746 475 wird auch die freie Dehnungen ermöglichende Halterung eines Katalysator-Trägerkörpers mit einem Spannband beschrieben. Diese Art der Befestigung ist jedoch nicht sehr stabil in Bezug auf Schwingungen in der Abgasströmung und mechanische Stöße. Außerdem bereitet die Befestigung des Spannbandes am Mantelrohr fertigungstechnische Schwierigkeiten.DE-A 2 746 475 also describes the mounting of a catalyst carrier body, which enables free expansion, with a tensioning strap. However, this type of attachment is not very stable in terms of vibrations in the exhaust gas flow and mechanical shocks. In addition, the fastening of the tension band on the casing tube causes manufacturing difficulties.

Aufgabe der vorliegenden Erfindung ist es daher, durch geeignete Ausführung und Befestigung des Mantelrohres die Lebensdauer eines metallischen Katalysator-Trägerkörpers zu verlängern, insbesondere beim Einsatz als Startkatalysator, wobei gleichzeitig günstige Bedingungen für den Einbau in ein Abgassystem geschaffen werden sollen.It is therefore an object of the present invention to extend the life of a metallic catalyst carrier body by suitable design and attachment of the jacket tube, in particular when used as a starting catalyst, while at the same time creating favorable conditions for installation in an exhaust system.

Außerdem soll ein entsprechendes Herstellungsverfahren angegeben werden. Die Lösung dieser Aufgabe erfolge gemäß dem Anspruch 1A corresponding manufacturing process should also be specified. This object is achieved according to claim 1

Merkmale:

  • a) der Katalysator-Trägerkörper ist stimseitig zumindest über einen Teil der Stimflächen bis zu einer vorgebbaren Tiefe, vorzugsweise einige Millimeter tief, verlötet;
  • b) das Mantelrohr endet in einem vorgebbaren Abstand, der größer als die Löttiefe ist, vor beiden Stirnseiten, vorzugsweise in einem Abstand von 5 bis 40 mm;
  • c) das Mantelrohr ist nur auf einer schmalen Umfangszone mit der äußersten Lage des Katalysator-Trägerkörpers verlötet und erstreckt sich ringfömig nur etwa über diese Umfangszone.
Characteristics:
  • a) the catalyst support body is soldered on the end face at least over a portion of the end faces to a predeterminable depth, preferably a few millimeters deep;
  • b) the jacket tube ends at a predeterminable distance, which is greater than the soldering depth, in front of both faces, preferably at a distance of 5 to 40 mm;
  • c) the jacket tube is only soldered to the outermost layer of the catalyst carrier body on a narrow circumferential zone and extends annularly only approximately over this circumferential zone.

Diese Maßnahme ermöglicht zunächst einmal eine stirnseitige Verlötung, welche nicht gleichzeitig auch zu einer Verbindung mit dem Mantelrohr im Bereich der Stirnseiten führt. Das Ergebnis ist, daß bei thermischen Wechselbelastungen die verlöteten Strinseiten nicht durch eine feste Verbindung zum Mantelrohr in ihrer radialen und axialen Dehnung behindert werden, so daß insbesondere keine Zugbelastungen in diesem Bereich beim Abkühlen auftreten können. Dabei sollte der Abstand des Mantelrohres von den Stirnseiten vorzugsweise erheblich größer als die Tiefe der Lötung sein, damit bei thermischen Wechselbelastungen nur eine schwache Biegebelastung der äußeren Lagen auftritt soll das Mantelrohr nur auf einer schmalen Umfangszone mit der äußersten Lage des Katalysator-Trägerkörpers verlötet sein. Dies führt nicht nur zu einer Verringerung der thermischen Wechselbelastungen der Strinseiten, sondern ermöglicht auch eine kaum behinderte Längendehnung bzw. ein ungehindertes Wachstum des Katalysator-Trägerkörpers, welches sich bei längerem Betrieb einstellen kann. Bei einem nicht verkürzten Mantelrohr ist eine solche Lötung aus fertigungstechnischen Gründen kaum zu erreichen, da bei stirnseitigen Verlötungen im allgemeinen auch Lot zwischen die äußerste Lage des Katalysator-Trägerkörpers und das Mantelrohr gelangen und so dort unerwünschte Lötverbindungen bewirken wird.This measure enables soldering on the end face, which does not also lead to a connection to the jacket tube in the region of the end faces. The result is that in the case of alternating thermal loads, the soldered strins are not hampered in their radial and axial expansion by a fixed connection to the tubular casing, so that in particular no tensile loads can occur in this area during cooling. The distance of the jacket tube from the end faces should preferably be considerably greater than the depth of the soldering, so that in the case of alternating thermal loads only a slight bending load of the outer layers occurs, the jacket tube should only be soldered to the outermost layer of the catalyst carrier body on a narrow circumferential zone. This not only leads to a reduction in the thermal alternating loads on the sides of the string, but also enables the lengthening of the catalyst, which is hardly impeded, or unhindered growth of the catalyst carrier body, which can occur during prolonged operation. In the case of a non-shortened jacket tube, such soldering can hardly be achieved for manufacturing reasons, since in the case of face-side soldering, solder generally also gets between the outermost layer of the catalyst carrier body and the jacket tube and will thus cause undesired solder connections.

Erfindungsgemäß kann das Mantelrohr praktisch nur auf den Bereich der verlöteten Umfangszone beschränkt sein. Es umschließt dann den sehr viel längeren Katalysator-Trägerkörper etwa ringförmig. Diese Ausführung eignet sich natürlich nur für spätere Einbauverhältnisse, bei denen ohnehin noch ein schützendes Hüllrohr angebracht wird, was z.B. bei Startkatalysatoren allgemein der Fall ist. An ein bis zu einem schmallen Ring verkürztes Mantelrohr können die üblichen Rohre des Auslaßsystems eines Verbrennungsmotores problemlos angeschweißt werden, so daß insgesamt ein geschlossenes System entsteht. Die verlöteten Stirnseiten des Katalysator-Trägerkörpers ragen bei fertiggestelltem Abgassystem dann freitragend in die anschließenden Rohrleitungen oder werden durch diese mit gestützt.According to the invention, the casing tube can practically only be limited to the area of the soldered peripheral zone. It then surrounds the much longer catalyst carrier body in a ring shape. This version is of course only suitable for later installation conditions, in which a protective cladding tube is attached anyway, which e.g. is generally the case with starting catalysts. The usual pipes of the exhaust system of an internal combustion engine can be easily welded onto a jacket pipe shortened to a narrow ring, so that a closed system is created overall. When the exhaust system is finished, the soldered end faces of the catalyst carrier body then project freely into the subsequent pipelines or are supported by them.

Ein weiteres besonders wichtiges Merkmal, welches sich prinzipiell auch ohne die Merkmale der vorhergehenden Ansprüche verwirklichen läßt, ist im Anspruch 2 angegeben. Danach weist das Mantelrohr einen geringfügig klaffenden Längsschlitz auf, der vorzugsweise nur in einem Bereich durch eine Schweißung überbrückt und dadurch fixiert ist. Wie im Anspruch 3 angegeben, ermöglicht ein solches längsgeschlitztes Mantelrohr auf besonders einfache Weise die Herstellung einer exakten, genau definierten verlöteten Umfangszone zwischen Mantelrohr und äußerster Lage des Katalysator-Trägerkörpers. Während nach dem Stand der Technik Lot beim Aufschieben des Mantelrohres immer irgenwie undefiniert verteilt wurde, läßt sich dies bei einem geschlitzten Mantelrohr vermeiden. Die gewünschte zu verlötende Umfangszone wird mit Lot, z.B. in Form von Pulver, Paste oder Folie, versehen und anschließend das an seinem Längsschlitz aufgespreitzte Mantelrohr ohne Verschmieren des Lotes aufgeschoben. Außerdem wird bei diesem Herstellungsverfahren ein Verknautschen oder Verformen der äußeren Lagen vermieden, welches sich insbesondere bei einem verkürzten Mantelrohr sehr negativ bemerkbar machen würde, da die verknautschten Lagen beidseitig undefiniert überstehen würden. Nach Aufheben der Aufspreitzung kann das Mantelrohr in einer geeigneten Kalibriervorrichtung exakt auf den gewünschten Durchmesser gebracht und beispielsweise durch einen Schweißpunkt fixiert werden. Die übrigen Fertigungsschritte werden von dieser Maßnahme nicht beeinträchtigt. Insbesondere können die Stirnseiten vorher oder nach diesen Schritten belotet werden. Eine anschließende vollständig Verschweißung des Längsschlitzes ist in vielen Fällen unnötig, da die Rohre des Abgassystems von beiden Seiten über das geschlitzte Mantelrohr bis zum Schweißpunkt geschoben werden können. In einem solchen Falle begünstigt der Längsschlitz sogar den Ausgleich von Fertigungstoleranzen, da er in gewissen Grenzen zusammengedrückt werden kann.Another particularly important feature, which in principle can also be realized without the features of the preceding claims, is specified in claim 2. Thereafter, the jacket tube has a slightly gaping longitudinal slot, which is preferably bridged by welding only in one area and is thereby fixed. As stated in claim 3, such a longitudinally slotted jacket tube enables the production of an exact, precisely defined soldered peripheral zone between the jacket tube and the outermost layer of the catalyst carrier body in a particularly simple manner. While according to the prior art, solder was always distributed in an undefined manner when the jacket tube was pushed on, this can be avoided with a slotted jacket tube. The desired circumferential zone to be soldered is provided with solder, for example in the form of powder, paste or foil, and then at its longitudinal slot spread on casing tube pushed on without smearing the solder. In addition, this manufacturing process prevents the outer layers from being crumpled or deformed, which would have a particularly negative effect in the case of a shortened jacket tube, since the crumpled layers would survive indefinitely on both sides. After the spreading has been removed, the jacket tube can be brought to the desired diameter exactly in a suitable calibration device and fixed, for example, by a welding point. The remaining manufacturing steps are not affected by this measure. In particular, the end faces can be soldered before or after these steps. A subsequent complete welding of the longitudinal slot is unnecessary in many cases, since the pipes of the exhaust system can be pushed from both sides over the slotted jacket pipe to the welding point. In such a case, the longitudinal slot even favors the compensation of manufacturing tolerances, since it can be compressed within certain limits.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt.An embodiment of the invention is shown in the drawing.

Der eigentliche Katalysator-Trägerkörper 1 besteht aus abwechselnden Lagen spiralig aufgewickelter glatter 2 und gewellter 3 Bleche. Auch anders strukturierte Bleche, die für Gas durchlässige Kanäle bilden, kommen für die vorliegende Erfindung in Betracht. Der Katalysator-Trägerkörper 1 ist stimseitig bis zu einer Tiefe t1 bzw. t2 verlötet, wobei nicht unbedingt die gesamten Stirnflächen, sondern ggf. nur bestimmte Bereiche davon verlötet sein müssen. Umgeben wird der Katalysator-Trägerkörper 1 von einem verkürzten Mantelrohr 4, welches beidseitig mit einem Abstand a1 bzw. a2 vor den Stirnseiten endet. Die beiden Abstände ai, a2 müssen nicht notwendigerweise gleich groß sein. Das Mantelrohr 4 ist ganz oder vorzugsweise nur in einem schmalen Umfangsbereich 5 mit der äußersten Lage des Katalysator-Trägerkörpers 1 verlötet.The actual catalyst carrier body 1 consists of alternating layers of spirally wound smooth 2 and corrugated 3 sheets. Metal sheets with a different structure, which form channels which are permeable to gas, are also suitable for the present invention. The catalyst carrier body 1 is soldered on the face side to a depth t 1 or t 2 , the entire end faces not necessarily, but possibly only certain areas thereof having to be soldered. The catalyst carrier body 1 is surrounded by a shortened jacket tube 4, which ends on both sides with a distance a 1 or a 2 in front of the end faces. The two distances a i , a 2 do not necessarily have to be the same size. The casing tube 4 is completely or preferably only soldered to the outermost layer of the catalyst carrier body 1 in a narrow peripheral region 5.

Dabei kann das Mantelrohr 4 einen Längsschlitz 6 (der nicht unbedingt exakt in Längsrichtung verlaufen muß) aufweisen, welcher vorzugsweise an einer Stelle durch eine Schweißverbindung 7 fixiert ist.The casing tube 4 can have a longitudinal slot 6 (which does not necessarily have to run exactly in the longitudinal direction), which is preferably fixed at one point by a welded connection 7.

Durch die erfindungsgemäße Ausführung werden die verlöteten Strimseiten nicht in ihrer thermische radialen Wechseldehnung behindert, wodurch sich die Lebensdauer erhöht. Das geschlitzte Mantelrohr ermöglicht die präzise Festlegung und Herstellung eines schmalen verlöteten Umfangsbereiches, welcher dazu führt, daß auch Änderungen der Länge des Katalysator-Trägerkörpers nicht behindert werden, was sich ebenfalls günstig auf die Lebensdauer auswirkt. Zusätzlich verhindert das geschlitzte Mantelrohr ein Verknautschen oder Verschieben der äußersten Lagen beim Aufschieben, ohne daß es aufwendiger anderer Maßnahmen bedarf. Ein erfindungsgemäßer Katalysator-Trägerkörper mit verkürztem Mantelrohr eignet sich insbesondere für den Einsatz als Startkatalysator im motornahen Bereich unter hohen thermischen Wechselbelastungen.The design according to the invention does not impede the thermal radial alternating expansion of the soldered ends, which increases the service life. The slotted jacket tube enables the precise fixing and production of a narrow soldered peripheral area, which means that changes in the length of the catalyst carrier body are not hindered, which also has a favorable effect on the service life. In addition, the slotted casing tube prevents the outer layers from being crumpled or shifted when being pushed open, without the need for complex other measures. A catalyst carrier body according to the invention with a shortened jacket tube is particularly suitable for use as a starting catalyst in the area near the engine under high thermal alternating loads.

Claims (3)

1. Metal catalyst carrier body (1) with a honeycomb structure formed from textured metal sheets (2, 3) and through which gas can flow, said honeycomb structure being surrounded by a casing tube (4) which is shorter than the catalyst carrier body (1), characterised by the following features:
a) the end surfaces of the catalyst carrier body (1) are brazed at least over a portion of said end surfaces as far as a given depth (ti, t2), preferably a few millimeters;
b) the casing tube (4) ends before the two end surfaces at a given distance (a1, a2) away, this being greater than the brazing depth (ti, t2), preferably a distance of 5 to 40 mm;
c) the casing tube (4) is only brazed to the outermost layer of the catalyst carrier body (1) over a narrow circumferential zone (5) and extends annularly over approximately only this circumferential zone (5).
2. Catalyst carrier body according to claim 1, characterised in that the casing tube (4) has a longitudinal slit (6) which stands slightly open and which is spanned and fixed by a weld (or welds) (7) preferably only in one or in several small regions.
3. Method for producing a catalyst carrier body according to claim 2, characterised by the following features:
a) the outermost layer of the pre-wound catalyst carrier body (1) and/or the inside of the casing tube (4) is provided with brazing material in the circumferential zone (5) which is to be brazed, if required with the aid of adhesives, glues or binders;
b) with the longitudinal slit (6) spread open, the casing tube (4) bearing the longitudinal slit (6) is slipped over the catalyst carrier body (1) into the intended position and the expanded tube is then released and the slit is welded at least at one point (7);
c) before or after steps a) and b) the end surfaces are provided fully or partially with brazing material in a manner known per se;
d) the catalyst carrier body (1) is brazed together with the casing tube (4).
EP88100077A 1987-01-15 1988-01-05 Metallic catalyst support having a short tubular casing Expired - Lifetime EP0277477B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88100077T ATE52836T1 (en) 1987-01-15 1988-01-05 METALLIC CATALYST CARRIER WITH SHORTENED JACKET.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3701052 1987-01-15
DE3701052 1987-01-15

Publications (2)

Publication Number Publication Date
EP0277477A1 EP0277477A1 (en) 1988-08-10
EP0277477B1 true EP0277477B1 (en) 1990-05-16

Family

ID=6318898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100077A Expired - Lifetime EP0277477B1 (en) 1987-01-15 1988-01-05 Metallic catalyst support having a short tubular casing

Country Status (8)

Country Link
US (1) US4948353A (en)
EP (1) EP0277477B1 (en)
JP (1) JPS63176613A (en)
KR (1) KR960000483B1 (en)
AT (1) ATE52836T1 (en)
DE (1) DE3860155D1 (en)
ES (1) ES2014333B3 (en)
MX (1) MX170296B (en)

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Publication number Priority date Publication date Assignee Title
US5403558A (en) * 1988-10-04 1995-04-04 Nippon Steel Corporation Heat and fatigue resistant metallic carrier for automobile exhaust gas-purifying catalyst
JPH02124215U (en) * 1989-03-24 1990-10-12
FR2656376B1 (en) * 1989-12-22 1994-04-29 Rosi Ets EXHAUST, ESPECIALLY CATALYTIC, FOR BURNED GASES FROM INTERNAL COMBUSTION ENGINES.
JPH0424611U (en) * 1990-06-19 1992-02-27
JPH0815559B2 (en) * 1990-11-13 1996-02-21 新日本製鐵株式会社 Race track type metal carrier for automobile exhaust gas catalyst with excellent thermal stress and thermal fatigue resistance
DE19704144A1 (en) * 1997-02-04 1998-08-06 Emitec Emissionstechnologie Extruded honeycomb body, in particular catalyst carrier body, with reinforced wall structure
DE10018640A1 (en) * 2000-04-14 2001-10-31 Emitec Emissionstechnologie Catalytic converter carrier body with sleeve and shortened jacket tube
DE10027807A1 (en) * 2000-06-05 2002-01-31 Emitec Emissionstechnologie Sheet with a barrier for a honeycomb body
DE10045540A1 (en) * 2000-09-13 2002-03-21 Emitec Emissionstechnologie Honeycomb body with shortened, slotted inner jacket tube
JP2003200060A (en) * 2002-01-10 2003-07-15 Calsonic Kansei Corp Metal-made catalyst carrier and manufacturing method therefor
DE102004015814A1 (en) * 2004-03-31 2005-10-20 Volkswagen Ag Exhaust gas purifying device for an internal combustion engine has an exhaust gas treatment unit (EGTU) and a tubular jacket made from a sheet metal plate for mounting the EGTU inside the jacket
JP2008045414A (en) * 2006-08-10 2008-02-28 Yamaha Marine Co Ltd Catalyst support structure
KR100901227B1 (en) * 2007-05-03 2009-06-08 오철주 Brazing method of diesel particulate filter
KR100901226B1 (en) * 2007-05-03 2009-06-08 오철주 Brazing method of diesel particulate filter
USD976571S1 (en) * 2019-11-15 2023-01-31 Make Great Sales Limited Straw carrying tube

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DE2746475A1 (en) * 1977-10-15 1979-04-19 Volkswagenwerk Ag Holder for catalytic exhaust gas purifier housing - has clamping band providing secure support even at high temperatures
DE2856030C2 (en) * 1978-12-23 1987-02-12 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart Method for producing a carrier matrix wound from metal foils for an exhaust gas cartridge
DE2924592C2 (en) * 1979-06-19 1983-05-26 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart Method for producing a carrier matrix for a catalytic reactor for exhaust gas purification in internal combustion engines of motor vehicles
DE3037796C2 (en) * 1980-10-07 1983-06-30 Interatom Internationale Atomreaktorbau Gmbh, 5060 Bergisch Gladbach Method of soldering and its use
DE3603882A1 (en) * 1985-02-14 1986-08-14 Volkswagen AG, 3180 Wolfsburg Method of producing a metal supporting body for a converter for exhaust-gas purifying, and metal supporting body produced according to this method
EP0212243B1 (en) * 1985-07-25 1989-07-12 INTERATOM Gesellschaft mit beschränkter Haftung Mounting device for a metallic flue gas catalyst support body, and method of manufacturing it
DE3529654A1 (en) * 1985-08-19 1987-02-19 Interatom METHOD FOR SELECTIVE SOLDERING OF A METAL CATALYST SUPPORT BODY AND APPROPRIATELY PRODUCED CATALYST SUPPORT BODY
DE8605649U1 (en) * 1986-03-01 1986-04-17 Degussa Ag, 6000 Frankfurt Device for holding monolith catalysts
ES2010201B3 (en) * 1986-05-12 1989-11-01 Interatom Ges Mit Beschrankter Haftung ALVEOLATED BODY, ESPECIALLY CATALYST CARRYING BODY, WITH INTERLOCKED METAL SHEET LAYERS IN OPPOSITE SENSES AND PROCEDURE FOR ITS MANUFACTURE.
ATE45410T1 (en) * 1986-05-12 1989-08-15 Interatom METALLIC HONEYCOMB BODY, IN PARTICULAR CATALYST CARRIER BODY, WITH SUPPORTING WALL AND PROCESS FOR ITS MANUFACTURE.
DE3786756D1 (en) * 1986-11-20 1993-09-02 Emitec Emissionstechnologie METAL CATALYST SUPPORT BODY AND METHOD FOR PRODUCING THE SAME.

Also Published As

Publication number Publication date
KR880008831A (en) 1988-09-13
US4948353A (en) 1990-08-14
EP0277477A1 (en) 1988-08-10
MX170296B (en) 1993-08-16
ES2014333B3 (en) 1990-07-01
KR960000483B1 (en) 1996-01-08
DE3860155D1 (en) 1990-06-21
JPH0583728B2 (en) 1993-11-29
JPS63176613A (en) 1988-07-20
ATE52836T1 (en) 1990-06-15

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