EP1287237A1 - Jacket tube with thermally insulating beading - Google Patents

Jacket tube with thermally insulating beading

Info

Publication number
EP1287237A1
EP1287237A1 EP01949350A EP01949350A EP1287237A1 EP 1287237 A1 EP1287237 A1 EP 1287237A1 EP 01949350 A EP01949350 A EP 01949350A EP 01949350 A EP01949350 A EP 01949350A EP 1287237 A1 EP1287237 A1 EP 1287237A1
Authority
EP
European Patent Office
Prior art keywords
zone
jacket tube
inner diameter
tube
honeycomb body
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.)
Granted
Application number
EP01949350A
Other languages
German (de)
French (fr)
Other versions
EP1287237B1 (en
Inventor
Rolf BRÜCK
Peter Hirth
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
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 Emitec Gesellschaft fuer Emissionstechnologie mbH filed Critical Emitec Gesellschaft fuer Emissionstechnologie mbH
Publication of EP1287237A1 publication Critical patent/EP1287237A1/en
Application granted granted Critical
Publication of EP1287237B1 publication Critical patent/EP1287237B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation

Definitions

  • the present invention relates to a tubular casing, in particular for a honeycomb body for exhaust gas treatment, according to the preamble of claim 1.
  • the present invention also relates to a catalytic converter with a tubular casing according to the preamble of claim 8.
  • Such catalytic converters are preferably used in one Exhaust system of a nerbrennkraftkraftmaschine used.
  • Catalytic converters are used to purify the exhaust gas.
  • the catalytic converters have a catalytically active surface, which from a certain temperature (approx. 250 ° C) causes a chemical conversion of the pollutants in the exhaust gas (e.g. carbon monoxide, hydrocarbon, nitrogen oxide). It is important to minimize the time until this light-off temperature of the catalytic converter is reached.
  • US Pat. No. 4,282,186 discloses a catalytic converter for cleaning exhaust gases from a motor vehicle's nerbrma engine with a carrier matrix made of bonded metal foils and a jacket tube.
  • the jacket tube has a smaller inner diameter near its end faces than in a central area.
  • the carrier matrix is fixed by the end regions of the casing tube with a smaller inner diameter, an additional welded or soldered connection being proposed to secure this press connection.
  • Due to the larger inner diameter in the central area of the casing tube, the catalytic converter has a circumferential free space in the central area. This free space serves as an insulation damper, which prevents heat transfer from the carrier matrix to the jacket pipe in this area.
  • the known catalytic converter is flowed through by the hot exhaust gas from the ner internal combustion engine, a temperature gradient from the gas inlet side to the gas outlet side forming in particular in the cold start phase.
  • the carrier matrix first reaches the required light-off temperature of approx. 250 ° C. near the gas inlet side.
  • the catalytic reaction is exothermic, that is, with the release of thermal energy, as a result of which regions of the support matrix lying downstream are additionally heated. This heating behavior was not taken into account in the symmetrical design of the known catalytic converter.
  • the object of the present invention is to provide a jacket tube for a catalytic converter which improves the cold start behavior of the catalytic converter and enables a permanent connection between the jacket tube and the catalyst carrier body.
  • the casing pipe according to the invention has a first zone near a first end face and a third zone near a second end face, the casing pipe in the first and third zones having a first inner diameter. Furthermore, the jacket tube has a second zone which is arranged between the first and the third zone, the second zone having a second inner diameter which is larger than the first inner diameter.
  • the jacket pipe according to the invention is characterized in that the first zone has an axial length of less than 5 mm.
  • the first zone is preferably designed with an axial length of less than 3 mm.
  • the first and third zones with the smaller first inner diameter enable, for example, a joining of the casing tube to a support body if the latter is designed so that it has contact with the casing tube in these zones.
  • the technical connection can be produced, for example, by a known soldering process.
  • the first zone is made relatively narrow. The result of this is that the contact between the casing tube and the support matrix near the first end face is limited to a few millimeters, heat dissipation from the support body to the casing tube being reduced.
  • the first zone of the casing tube has a length of at least 1.5 mm.
  • Such jacket pipes are used in particular in catalytic converters in an exhaust system of an internal combustion engine.
  • the casing tube and the catalyst carrier body are subject to high dynamic and thermal stress. So that the first zone ensures permanent fixation of the support body in the tubular casing, a length of at least 1.5 mm is required to design a joining connection.
  • the second zone has an extension of 10 to 40 mm.
  • An embodiment is preferred in which the second zone has an extension of 10 to 20 mm.
  • the extension of the second zone of the jacket tube defines the region in which the contact of the catalyst carrier body with the jacket tube is prevented and heat flow is thus prevented. Since the support body heats up quickly due to the exothermic reactions during a catalytic reaction, it is sufficient to interrupt the contact between the support body and the jacket tube only at the point near which the light-off temperature has already been reached after a short period of time.
  • the second inside diameter is at least 0.4 mm, preferably 2 mm, larger than the first inside diameter.
  • the distance between the jacket tube and a catalyst carrier body is defined in the second zone.
  • the catalyst carrier body expands in the second zone during the cold start phase due to the increasing temperature.
  • at least a radial distance of 0.2 mm is required.
  • the axial extent of the second zone is at least five times, preferably at least ten times, as large as the difference between the first and the second inner diameter. This means, for example, that with a second inner diameter that is 2 mm larger than the first inner diameter, the axial extent of the second zone is at least 10, preferably at least 20 mm.
  • the third zone has an axial extent, the axial extent being greater than the length of the first zone and / or the extent of the second zone.
  • the third zone is therefore relatively wide, which ensures a permanent connection in the third zone with a catalyst carrier body. It is particularly advantageous if the third zone has an axial extension of 10 to 50 mm.
  • the jacket tube has a thickness of 0.1 to 1.5 mm. This small thickness has the advantage that the jacket tube represents a lower thermal mass.
  • a catalytic converter with the casing tube according to the invention is proposed, which is particularly suitable for use in a Exhaust system of an internal combustion engine is suitable.
  • the catalytic converter has a honeycomb body made of sheet metal layers, the honeycomb body being at least partially structured in such a way that an exhaust gas can flow through it in one direction of flow.
  • the first zone of the casing tube is arranged near an inlet face and the third zone near an outlet face of the catalytic converter.
  • the honeycomb body is connected to the casing tube in the first and third zones by joining technology.
  • the catalytic converter Due to the direction of flow of the exhaust gas, the catalytic converter has a hotter inlet side in the cold start phase.
  • the jacket tube is accordingly aligned so that the first zone is arranged near the inlet side of the catalytic converter.
  • the honeycomb body absorbs heat through the exhaust gas flowing through it and heats up. Due to the flow behavior of the exhaust gas, only a relatively small amount of the exhaust gas flows through radially outer regions of the honeycomb body, as a result of which the heating of these regions takes place more slowly.
  • the first zone of the jacket tube is made relatively narrow, as a result of which the contact of the jacket tube with the honeycomb body is reduced.
  • This narrow contact area is also ensured in the case of a jacket tube which projects beyond the entry face of the honeycomb body. In this embodiment, it extends from the entry face of the honeycomb body to the second zone of the tubular casing. This ensures faster heating of the honeycomb body near the entry face.
  • a cavity with air is arranged in the second zone between the casing tube and the honeycomb body.
  • the cavity with air serves as an insulator, which prevents heat transfer from the heating honeycomb body to the still cool jacket tube.
  • Fig. 1 is a perspective view of an inventive
  • Fig. 2 shows a longitudinal section through an embodiment of the casing tube according to the invention with a honeycomb body.
  • FIG. 1 shows a perspective view of the casing tube 1 according to the invention with a first zone 2 near a first end face 10 and a third zone 4 near a second end face 11.
  • the casing tube 1 has a first inner diameter 8 in the first zone 2 and the third zone 4 Furthermore, the
  • the second inner diameter 9 of the second zone 3 is larger than the first inner diameter 8.
  • the first zone 2 has an axial 19
  • Length 5 less than 5 mm, preferably less than 3 mm.
  • the first zone 2 is followed by the second zone 3 with an axial extension 6, the
  • Extent 6 is between 10 and 40 mm.
  • the third zone 4 has an axial
  • FIG. 2 shows a longitudinal section through an embodiment of a catalytic converter with a casing tube 1 and a honeycomb body 12. Exhaust gas can flow through the honeycomb body 12 in a flow direction 13. Accordingly, the catalytic converter has an entry end face 16 and an exit end face 17.
  • the casing tube 1 is like this arranged that the first zone 2 is arranged near the entry end face 16.
  • a joining connection 14 with the honeycomb body 12 is formed in the region of the first zone 2.
  • the honeycomb body 12 shown has sheet metal layers 18 which are at least partially structured such that an exhaust gas can flow through the honeycomb body 12. For this reason, it is particularly advantageous to carry out the joining connection 14 using a soldering process.
  • the second zone 3 connects with a cavity 15 between the honeycomb body 12 and the casing tube 1.
  • This cavity is preferably filled with air, whereby heat transfer from the honeycomb body 12 to the casing tube 1 is prevented in the region of the second zone 3.
  • the distance 21 between the honeycomb body 12 and the casing tube 3 is selected so that contact with the casing tube 1 in the second zone 3 is prevented even when the honeycomb body 12 is thermally expanded.
  • the third zone 4 extends from the second zone 3 to the outlet end face 17.
  • a connection 14 of the casing tube 1 with the honeycomb body 12 does not extend over the entire axial extent 7 of the third zone 4.
  • the jacket tube is made with a thickness 20 of 0.01 to 1.5 mm, whereby the heat capacity of the jacket tube 1 is reduced.
  • the jacket tube 1 consequently has a lower thermal mass and ensures rapid heating in the cold start phase of a catalytic converter.

Abstract

The invention relates to a jacket tube, especially for a honeycomb element (12) used for exhaust gas treatment. The inventive jacket tube is provided with a first area (2) which is located close to a first front face (10) and a third area (4) which is located close to a second front face (11). The jacket tube (1) has a first inner diameter in the first (2) and third area (4) and is provided with a second area (3) which is disposed between the first (2) and third area (4). The second area (3) has a second inner diameter (9) which is larger than the first inner diameter (8). The invention is characterized in that the axial (19) length (5) of the first area (2) is less than 5 mm, preferably less than 3 mm. The relatively narrow first area (2) enables the honeycomb to be permanently fixed and ensures that only a small amount of heat is transmitted to the jacket tube (1). As a result, a significant improvement is achieved in the cold start performance of a catalytic converter.

Description

Mantelrohr mit thermisch isolierenden Sicken Jacket tube with thermally insulating beads
Die vorliegende Erfindung bezieht sich auf ein Mantelrohr, insbesondere für einen Wabenkörper zur Abgasbehandlung, gemäß dem Oberbegriff des Anspruchs 1. Die vorliegende Erfindung bezieht sich ebenfalls auf einen katalytischen Konverter mit einem Mantelrohr gemäß dem Oberbegriff des Anspruchs 8. Derartige katalytische Konverter werden bevorzugt in einem Abgassystem einer Nerbren- nungskraftmaschine eingesetzt.The present invention relates to a tubular casing, in particular for a honeycomb body for exhaust gas treatment, according to the preamble of claim 1. The present invention also relates to a catalytic converter with a tubular casing according to the preamble of claim 8. Such catalytic converters are preferably used in one Exhaust system of a nerbrennkraftkraftmaschine used.
Zur Erfüllung der weltweit schärfer werdenden Abgasgrenzwerte werden derzeit unterschiedliche Konzepte zur Emissionsbegrenzung verfolgt. Dabei steht insbesondere das Emissionsverhalten des Abgassystems nach dem Kaltstart der Ner- brennungskraftmaschine im Nordergrund. Zur Reinigung des Abgases werden katalytische Konverter eingesetzt. Die katalytischen Konverter weisen eine kata- lyrisch aktive Oberfläche auf, die ab einer bestimmten Temperatur (ca. 250 °C) eine chemische Umsetzung der Schadstoffe im Abgas (z. B. Kohlenmonoxid, Kohlenwasserstoff, Stickoxid) bewirkt. Es gilt dabei, den Zeitraum bis zum Erreichen dieser Anspringtemperatur des katalytischen Konverters zu minimieren.Various emission limitation concepts are currently being pursued to meet the increasingly stringent exhaust gas limits worldwide. The emission behavior of the exhaust system after the cold start of the internal combustion engine is particularly important in the Nordergrund. Catalytic converters are used to purify the exhaust gas. The catalytic converters have a catalytically active surface, which from a certain temperature (approx. 250 ° C) causes a chemical conversion of the pollutants in the exhaust gas (e.g. carbon monoxide, hydrocarbon, nitrogen oxide). It is important to minimize the time until this light-off temperature of the catalytic converter is reached.
Aus der US 4,282,186 ist ein katalytischer Konverter zur Reinigung von Abgasen einer Nerbrermungskraftmaschine eines Kraftfahrzeuges mit einer Trägermatrix aus gebundenen Metallfolien und einem Mantelrohr bekannt. Das Mantelrohr weist nahe seinen Stirnflächen einen geringeren Innendurchmesser auf, als in einem mittleren Bereich. Die Trägermatrix wird durch die stirnseitigen Bereiche des Mantelrohres mit geringerem Innendurchmesser fixiert, wobei zur Sicherung dieser Preßverbindung eine zusätzliche Schweiß- oder Lötverbindung vorgeschlagen wird. Aufgrund des größeren Innendurchmessers im mittleren Bereich des Mantelrohres weist der katalytische Konverter einen umlaufenden Freiraum im mittleren Bereich auf. Dieser Freiraum dient als Isolationsdämpfer, der einen Wärmetransport von der Trägermatrix zum Mantelrohr in diesem Bereich verhindert. Der bekannte katalytische Konverter wird von dem heißen Abgas der Nerbrennungskraftmaschine durchströmt, wobei sich insbesondere in der Kaltstartphase ein Temperaturgefalle von der Gaseintrittsseite zur Gasaustrittsseite hin bildet. Demzufolge erreicht die Trägermatrix zuerst nahe der Gaseintrittsseite die erforderliche Anspringtemperatur von ca. 250°C. Die katalytische Reaktion läuft exotherm ab, also unter Abgabe von thermischer Energie, wodurch stromabwärts liegende Bereiche der Trägermatrix zusätzlich erwärmt werden. Dieses Aufheizverhalten wurde bei der symmetrischen Gestaltung des bekannten katalytischen Konverters nicht berücksichtigt.US Pat. No. 4,282,186 discloses a catalytic converter for cleaning exhaust gases from a motor vehicle's nerbrma engine with a carrier matrix made of bonded metal foils and a jacket tube. The jacket tube has a smaller inner diameter near its end faces than in a central area. The carrier matrix is fixed by the end regions of the casing tube with a smaller inner diameter, an additional welded or soldered connection being proposed to secure this press connection. Due to the larger inner diameter in the central area of the casing tube, the catalytic converter has a circumferential free space in the central area. This free space serves as an insulation damper, which prevents heat transfer from the carrier matrix to the jacket pipe in this area. The known catalytic converter is flowed through by the hot exhaust gas from the ner internal combustion engine, a temperature gradient from the gas inlet side to the gas outlet side forming in particular in the cold start phase. As a result, the carrier matrix first reaches the required light-off temperature of approx. 250 ° C. near the gas inlet side. The catalytic reaction is exothermic, that is, with the release of thermal energy, as a result of which regions of the support matrix lying downstream are additionally heated. This heating behavior was not taken into account in the symmetrical design of the known catalytic converter.
Aufgabe der vorliegenden Erfindung ist es, ein Mantelrohr für einen katalytischen Konverter anzugeben, welches das Kaltstartverhalten des katalytischen Konverters verbessert und eine dauerhafte Verbindung von Mantelrohr und Katalysator-Trägerkörper ermöglicht.The object of the present invention is to provide a jacket tube for a catalytic converter which improves the cold start behavior of the catalytic converter and enables a permanent connection between the jacket tube and the catalyst carrier body.
Diese Aufgäbe wird erfindungsgemäß durch ein Mantelrohr, insbesondere für einen Wabenkörper zur Abgasbehandlung, gemäß den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen sind in den abhängigen Ansprüchen angegeben.This task is solved according to the invention by a tubular casing, in particular for a honeycomb body for exhaust gas treatment, according to the features of claim 1. Advantageous further developments are specified in the dependent claims.
Das erfindungsgemäße Mantelrohr weist eine erste Zone nahe einer ersten Stirnfläche und eine dritte Zone nahe einer zweiten Stirnfläche auf, wobei das Mantelrohr in der ersten und dritten Zone einen ersten Innendurchmesser hat. Weiterhin weist das Mantelrohr eine zweite Zone auf, die zwischen der ersten und der dritten Zone angeordnet ist, wobei die zweite Zone einen zweiten Innendurchmesser hat, der größer als der erste Innendurchmesser ist. Das erfindungsgemäße Mantelrohr zeichnet sich dadurch aus, daß die erste Zone eine axiale Länge kleiner 5 mm aufweist. Bevorzugt ist die erste Zone mit einer axialen Länge kleiner 3 mm ausgeführt. Die erste und die dritte Zone mit dem kleineren ersten Innendurchmesser ermöglichen beispielsweise eine fügetechnische Verbindung des Mantelrohres mit einem Trägerkörper, wenn dieser so gestaltet ist, daß er in diesen Zonen mit dem Mantelrohr Kontakt hat. Die fügetechnische Verbindung kann beispielsweise durch ein bekanntes Lötverfahren erzeugt werden.The casing pipe according to the invention has a first zone near a first end face and a third zone near a second end face, the casing pipe in the first and third zones having a first inner diameter. Furthermore, the jacket tube has a second zone which is arranged between the first and the third zone, the second zone having a second inner diameter which is larger than the first inner diameter. The jacket pipe according to the invention is characterized in that the first zone has an axial length of less than 5 mm. The first zone is preferably designed with an axial length of less than 3 mm. The first and third zones with the smaller first inner diameter enable, for example, a joining of the casing tube to a support body if the latter is designed so that it has contact with the casing tube in these zones. The technical connection can be produced, for example, by a known soldering process.
Aufgrund des Temperaturverlaufes beim Erhitzen eines katalytischen Konverters in einem Abgassystem ist die erste Zone relativ schmal ausgeführt. Das hat zur Folge, daß der Kontakt von Mantelrohr und Trägermatrix nahe der ersten Stirnfläche auf wenige Millimeter begrenzt ist, wobei eine Wärmeabfuhr von dem Trägerkörper zum Mantelrohr hin reduziert wird.Because of the temperature profile when heating a catalytic converter in an exhaust system, the first zone is made relatively narrow. The result of this is that the contact between the casing tube and the support matrix near the first end face is limited to a few millimeters, heat dissipation from the support body to the casing tube being reduced.
Gemäß einer weiteren Ausführungsform weist die erste Zone des Mantelrohres eine Länge von mindestens 1,5 mm auf. Derartige Mantelrohre werden insbesondere bei katalytischen Konvertern in einem Abgassystem einer Verbrer ungskraftmaschine eingesetzt. Dabei unterliegt das Mantelrohr sowie der Katalysator-Trägerkörper einer hohen dynamischen und thermischen Beanspruchung. Damit die erste Zone eine dauerhafte Fixierung des Trägerkörpers im Mantelrohr sicherstellt, ist mindestens eine Länge von 1,5 mm zur Ausgestaltung einer fügetechnischen Verbindung erforderlich.According to a further embodiment, the first zone of the casing tube has a length of at least 1.5 mm. Such jacket pipes are used in particular in catalytic converters in an exhaust system of an internal combustion engine. The casing tube and the catalyst carrier body are subject to high dynamic and thermal stress. So that the first zone ensures permanent fixation of the support body in the tubular casing, a length of at least 1.5 mm is required to design a joining connection.
Gemäß einer weiteren Ausgestaltung hat die zweite Zone eine Erstreckung von 10 bis 40 mm. Bevorzugt ist eine Ausführungsform, bei der die zweite Zone eine Erstreckung von 10 bis 20 mm hat. Bei einem katalytischen Konverter wird durch die Erstreckung der zweiten Zone des Mantelrohrs der Bereich definiert, in dem der Kontakt des Katalysator-Trägerkörpers mit dem Mantelrohr unterbunden und somit auch ein Wärmeabfluß verhindert ist. Da sich der Trägerkörper aufgrund der exothermen Reaktionen bei einer katalytischen Umsetzung schnell erwärmt, ist es ausreichend, den Kontakt von Trägerkörper und Mantelrohr nur an der Stelle zu unterbrechen, nahe der die Anspringtemperatur bereits nach einem kurzen Zeitraum erreicht ist. Gemäß noch einer weiteren Ausfuhrungsform ist der zweite Innendurchmesser mindestens 0,4 mm, vorzugsweise 2 mm, größer als der erste Innendurchmesser. Auf diese Weise wird der Abstand zwischen dem Mantelrohr und einem Katalysator-Trägerkörper in der zweiten Zone definiert. Der Katalysator- Trägerkörper dehnt sich in der zweiten Zone während der Kaltstartphase aufgrund der zunehmenden Temperatur aus. Damit ein Kontakt von Trägerkörper mit dem Mantelrohr verhindert wird, ist mindestens ein radialer Abstand von 0,2 mm erforderlich.According to a further embodiment, the second zone has an extension of 10 to 40 mm. An embodiment is preferred in which the second zone has an extension of 10 to 20 mm. In the case of a catalytic converter, the extension of the second zone of the jacket tube defines the region in which the contact of the catalyst carrier body with the jacket tube is prevented and heat flow is thus prevented. Since the support body heats up quickly due to the exothermic reactions during a catalytic reaction, it is sufficient to interrupt the contact between the support body and the jacket tube only at the point near which the light-off temperature has already been reached after a short period of time. According to yet another embodiment, the second inside diameter is at least 0.4 mm, preferably 2 mm, larger than the first inside diameter. In this way, the distance between the jacket tube and a catalyst carrier body is defined in the second zone. The catalyst carrier body expands in the second zone during the cold start phase due to the increasing temperature. In order to prevent contact of the carrier body with the casing tube, at least a radial distance of 0.2 mm is required.
Gemäß noch einer weiteren Ausführungsform ist die axiale Erstreckung der zweiten Zone mindestens fünffach, vorzugsweise mindestens zehnfach, so groß wie der Unterschied zwischen dem ersten und dem zweiten Innendurchmesser. Das bedeutet beispielsweise, daß bei einem zweiten Innendurchmesser, der 2 mm größer ist als der erste Innendurchmesser, die axiale Erstreckung der zweiten Zone mindestens 10, vorzugsweise mindestens 20 mm, beträgt.According to yet another embodiment, the axial extent of the second zone is at least five times, preferably at least ten times, as large as the difference between the first and the second inner diameter. This means, for example, that with a second inner diameter that is 2 mm larger than the first inner diameter, the axial extent of the second zone is at least 10, preferably at least 20 mm.
Gemäß einer weiteren Ausgestaltung des Mantelrohres weist die dritte Zone eine axiale Ausdehnung auf, wobei die axiale Ausdehnung größer ist als die Länge der erste Zone und/oder die Erstreckung der zweiten Zone. Die dritte Zone ist demzufolge relativ breit ausgeführt, wodurch eine dauerhafte fügetechnische Verbindung in der dritten Zone mit einem Katalysator-Trägerkörper gewährleistet ist. Besonders vorteilhaft ist es, wenn die dritte Zone eine axiale Ausdehnung von 10 bis 50 mm aufweist.According to a further embodiment of the casing tube, the third zone has an axial extent, the axial extent being greater than the length of the first zone and / or the extent of the second zone. The third zone is therefore relatively wide, which ensures a permanent connection in the third zone with a catalyst carrier body. It is particularly advantageous if the third zone has an axial extension of 10 to 50 mm.
Gemäß noch einer weiteren Ausfuhrungsform weist das Mantelrohr eine Dicke von 0,1 bis 1,5 mm auf. Diese geringe Dicke hat den Vorteil, daß das Mantelrohr eine geringere thermische Masse darstellt.According to yet another embodiment, the jacket tube has a thickness of 0.1 to 1.5 mm. This small thickness has the advantage that the jacket tube represents a lower thermal mass.
Weiterhin wird ein katalytischer Konverter mit dem erfϊndungsgemäßen Mantelrohr vorgeschlagen, der insbesondere für den Einsatz in einem Abgassystem einer Verbrer ungskraftmaschine geeignet ist. Der katalytische Konverter weist einen Wabenkörper aus Blechlagen auf, wobei der Wabenkörper zumindest teilweise so strukturiert ist, daß dieser für ein Abgas in einer Strömungsrichtung durchströmbar ist. Die erste Zone des Mantelrohres ist dabei nahe einer Eintrittsstirnseite und die dritte Zone nahe einer Austrittsstirnseite des katalytischen Konverters angeordnet. Der Wabenkörper ist in der ersten und der dritten Zone mit dem Mantelrohr fügetechnisch verbunden.Furthermore, a catalytic converter with the casing tube according to the invention is proposed, which is particularly suitable for use in a Exhaust system of an internal combustion engine is suitable. The catalytic converter has a honeycomb body made of sheet metal layers, the honeycomb body being at least partially structured in such a way that an exhaust gas can flow through it in one direction of flow. The first zone of the casing tube is arranged near an inlet face and the third zone near an outlet face of the catalytic converter. The honeycomb body is connected to the casing tube in the first and third zones by joining technology.
Aufgrund der Strömungsrichtung des Abgases weist der katalytische Konverter in der Kaltstartphase eine heißere Eintrittsseite auf. Das Mantelrohr ist demzufolge so ausgerichtet, daß die erste Zone nahe der Eintrittsseite des katalytischen Konverters angeordnet ist. Der Wabenkörper nimmt durch das ihn durchströmende Abgas Wärme auf und heizt sich auf. Aufgrund des Strömungsverhaltens des Abgases werden radial außenliegende Bereiche des Wabenkörpers nur von einer relativ geringen Menge des Abgases durchströmt, wodurch die Aufheizung dieser Bereiche verlangsamt abläuft. Um eine Abfuhr von thermischer Energie nahe der Eintrittsstirnseite zu reduzieren, ist die erste Zone des Mantelrohres relativ schmal ausgeführt, wodurch der Kontakt des Mantelrohres mit dem Wabenkörper reduziert wird. Dieser schmale Kontaktbereich ist auch bei einem Mantelrohr sichergestellt, welches über die Eintrittsstirnseite des Wabenkörpers hinausragt. Er erstreckt sich bei dieser Ausgestaltung von der Eintrittsstirnseite des Wabenkörpers bis zur zweiten Zone des Mantelrohres. Eine schnellere Aufheizung des Wabenkörpers nahe der Eintrittsstirnseite ist damit gewährleistet.Due to the direction of flow of the exhaust gas, the catalytic converter has a hotter inlet side in the cold start phase. The jacket tube is accordingly aligned so that the first zone is arranged near the inlet side of the catalytic converter. The honeycomb body absorbs heat through the exhaust gas flowing through it and heats up. Due to the flow behavior of the exhaust gas, only a relatively small amount of the exhaust gas flows through radially outer regions of the honeycomb body, as a result of which the heating of these regions takes place more slowly. In order to reduce the dissipation of thermal energy near the entry face, the first zone of the jacket tube is made relatively narrow, as a result of which the contact of the jacket tube with the honeycomb body is reduced. This narrow contact area is also ensured in the case of a jacket tube which projects beyond the entry face of the honeycomb body. In this embodiment, it extends from the entry face of the honeycomb body to the second zone of the tubular casing. This ensures faster heating of the honeycomb body near the entry face.
Gemäß einer weiteren Ausführungsform ist in der zweiten Zone zwischen dem Mantelrohr und dem Wabenkörper ein Hohlraum mit Luft angeordnet. Der Hohlraum mit Luft dient dabei als Isolator, der einen Wärmeübergang vom sich aufheizenden Wabenkörper zum noch kühlen Mantelrohr verhindert. Nachfolgend werden Weiterbildungen und besonders bevorzugte Ausführungsformen des erfindungsgemäßen Mantelrohres anhand der Zeichnungen näher erläutert.According to a further embodiment, a cavity with air is arranged in the second zone between the casing tube and the honeycomb body. The cavity with air serves as an insulator, which prevents heat transfer from the heating honeycomb body to the still cool jacket tube. Further developments and particularly preferred embodiments of the casing tube according to the invention are explained in more detail with reference to the drawings.
Es zeigen:Show it:
Fig. 1 eine perspektivische Ansicht eines erfindungsgemäßenFig. 1 is a perspective view of an inventive
Mantelrohres undCasing tube and
Fig. 2 einen Längsschnitt durch eine Ausführungsform des erfindungsgemäßen Mantelrohres mit Wabenkörper.Fig. 2 shows a longitudinal section through an embodiment of the casing tube according to the invention with a honeycomb body.
Fig. 1 zeigt eine perspektivische Ansicht des erfindungsgemäßen Mantelrohres 1 mit einer ersten Zone 2 nahe einer ersten Stirnfläche 10 und einer dritten Zone 4 nahe einer zweiten Stirnfläche 11. Das Mantelrohr 1 hat in der ersten Zone 2 und der dritten Zone 4 einen ersten Innendurchmesser 8. Weiterhin weist das1 shows a perspective view of the casing tube 1 according to the invention with a first zone 2 near a first end face 10 and a third zone 4 near a second end face 11. The casing tube 1 has a first inner diameter 8 in the first zone 2 and the third zone 4 Furthermore, the
Mantelrohr 1 eine zweite Zone 3 auf, die zwischen der ersten Zone 2 und der dritten Zone 4 angeordnet ist. Der zweite Innendurchmesser 9 der zweiten Zone 3 ist größer als der erste Innendurchmesser 8. Die erste Zone 2 hat eine axiale 19Jacket tube 1 on a second zone 3, which is arranged between the first zone 2 and the third zone 4. The second inner diameter 9 of the second zone 3 is larger than the first inner diameter 8. The first zone 2 has an axial 19
Länge 5 kleiner 5 mm, vorzugsweise kleiner 3 mm. Der ersten Zone 2 schließt sich die zweite Zone 3 mit einer axialen 19 Erstreckung 6 an, wobei dieLength 5 less than 5 mm, preferably less than 3 mm. The first zone 2 is followed by the second zone 3 with an axial extension 6, the
Erstreckung 6 zwischen 10 und 40 mm beträgt. Die dritte Zone 4 hat eine axialeExtent 6 is between 10 and 40 mm. The third zone 4 has an axial
19 Ausdehnung 7, die größer als die Länge 5 der ersten Zone 2 und/oder die Erstreckung 6 der zweiten Zone 3 ist.19 extension 7, which is greater than the length 5 of the first zone 2 and / or the extent 6 of the second zone 3.
Fig. 2 zeigt einen Längsschnitt durch eine Ausführungsform eines katalytischen Konverters mit einem Mantelrohr 1 und einem Wabenkörper 12. Der Wäbenkörper 12 ist in einer Strömungsrichtung 13 von einem Abgas durchströmbar. Dementsprechend weist der katalytische Konverter eine Eintrittsstirnseite 16 und eine Austrittsstirnseite 17 auf. Das Mantelrohr 1 ist so angeordnet, daß die erste Zone 2 nahe der Eintrittsstirnseite 16 angeordnet ist. Im Bereich der ersten Zone 2 ist eine fügetechnische Verbindung 14 mit dem Wabenkörper 12 ausgebildet. Der dargestellte Wabenkörper 12 weist Blechlagen 18 auf, die zumindest teilweise so strukturiert sind, daß der Wabenkörper 12 für ein Abgas durchströmbar ist. Aus diesem Grund ist es besonders vorteilhaft, die fügetechnische Verbindung 14 mit einem Belotungsverfahren durchzuführen.FIG. 2 shows a longitudinal section through an embodiment of a catalytic converter with a casing tube 1 and a honeycomb body 12. Exhaust gas can flow through the honeycomb body 12 in a flow direction 13. Accordingly, the catalytic converter has an entry end face 16 and an exit end face 17. The casing tube 1 is like this arranged that the first zone 2 is arranged near the entry end face 16. A joining connection 14 with the honeycomb body 12 is formed in the region of the first zone 2. The honeycomb body 12 shown has sheet metal layers 18 which are at least partially structured such that an exhaust gas can flow through the honeycomb body 12. For this reason, it is particularly advantageous to carry out the joining connection 14 using a soldering process.
Stromabwärts 13 der ersten Zone 2 schließt sich die zweite Zone 3 mit einem Hohlraum 15 zwischen Wabenkörper 12 und Mantelrohr 1 an. Dieser Hohlraum ist bevorzugt mit Luft gefüllt, wodurch im Bereich der zweiten Zone 3 ein Wärmeübergang von dem Wabenkörper 12 hin zum Mantelrohr 1 verhindert wird. Der Abstand 21 zwischen Wabenkörper 12 und Mantelrohr 3 ist dabei so gewählt, daß auch bei einer thermischen Ausdehnung des Wabenkörpers 12 ein Kontakt mit dem Mantelrohr 1 in der zweiten Zone 3 verhindert wird.Downstream 13 of the first zone 2, the second zone 3 connects with a cavity 15 between the honeycomb body 12 and the casing tube 1. This cavity is preferably filled with air, whereby heat transfer from the honeycomb body 12 to the casing tube 1 is prevented in the region of the second zone 3. The distance 21 between the honeycomb body 12 and the casing tube 3 is selected so that contact with the casing tube 1 in the second zone 3 is prevented even when the honeycomb body 12 is thermally expanded.
Die dritte Zone 4 erstreckt sich von der zweiten Zone 3 bis zur Austrittsstirnseite 17. Eine fügetechnische Verbindung 14 des Mantelrohres 1 mit dem Wabenkörper 12 erstreckt sich dabei nicht über die gesamte axiale 19 Ausdehnung 7 der dritten Zone 4.The third zone 4 extends from the second zone 3 to the outlet end face 17. A connection 14 of the casing tube 1 with the honeycomb body 12 does not extend over the entire axial extent 7 of the third zone 4.
Das Mantelrohr ist mit einer Dicke 20 von 0,01 bis 1,5 mm ausgeführt, wodurch die Wärmekapazität des Mantelrohres 1 reduziert wird. Das Mantelrohr 1 hat folglich eine geringere thermische Masse und gewährleistet ein schnelles Aufheizen in der Kaltstartphase eines katalytischen Konverters. The jacket tube is made with a thickness 20 of 0.01 to 1.5 mm, whereby the heat capacity of the jacket tube 1 is reduced. The jacket tube 1 consequently has a lower thermal mass and ensures rapid heating in the cold start phase of a catalytic converter.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
Mantelrohr erste Zone zweite Zone dritte ZoneJacket tube first zone second zone third zone
Längelength
Erstreckungextension
Ausdehnung erster Innendurchmesser zweiter Innendurchmesser erste Stirnfläche zweite StirnflächeExpansion of first inner diameter, second inner diameter, first end face, second end face
Wabenkörperhoneycombs
Strömungsrichtungflow direction
Verbindungconnection
Hohlraumcavity
EintrittsstirnseiteInlet end side
AustrittsstirnseiteOutlet end side
Blechlagesheet metal layer
Achseaxis
Dickethickness
Abstand distance

Claims

Patentansprüche claims
1. Mantelrohr, insbesondere für einen Wäbenkörper (12) zur Abgasbehandlung, mit einer ersten Zone (2) nahe einer ersten Stirnfläche (10) und einer dritten Zone (4) nahe einer zweiten1. jacket tube, in particular for a honeycomb body (12) for exhaust gas treatment, with a first zone (2) near a first end face (10) and a third zone (4) near a second
Stirnfläche (11), wobei das Mantelrohr (1) in der ersten (2) und dritten Zone (4) einen ersten Innendurchmesser (8) hat und weiterhin eine zweite Zone (3) aufweist, die zwischen der ersten (2) und dritten Zone (4) angeordnet ist, wobei die zweite Zone (3) einen zweiten Innendurchmesser (9) hat, der größer als der erste Innendurchmesser (8) ist, dadurch gekennzeichnet, daß die erste Zone (2) eine axiale (19) Länge (5) kleiner 5 mm, vorzugsweise kleiner 3 mm, aufweist.End face (11), wherein the casing tube (1) in the first (2) and third zone (4) has a first inner diameter (8) and also has a second zone (3), which is between the first (2) and third zone (4) is arranged, the second zone (3) having a second inside diameter (9) which is larger than the first inside diameter (8), characterized in that the first zone (2) has an axial (19) length (5th ) less than 5 mm, preferably less than 3 mm.
2. Mantelrohr nach Anspruch 1, dadurch gekennzeichnet, daß die erste Zone (2) des Mantelrohres (1) eine axiale (19) Länge (5) von mindestens2. Jacket tube according to claim 1, characterized in that the first zone (2) of the jacket tube (1) has an axial (19) length (5) of at least
1,5 mm aufweist.1.5 mm.
3. Mantelrohr nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die zweite Zone (3) eine axiale (19) Erstreckung (6) von 10 bis 40 mm, vorzugsweise von 10 bis 20 mm, hat.3. Jacket pipe according to claim 1 or 2, characterized in that the second zone (3) has an axial (19) extension (6) of 10 to 40 mm, preferably from 10 to 20 mm.
4. Mantelrohr nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der zweite Innendurchmesser (9) mindestens 0,4 mm , vorzugsweise 2 mm, größer ist als der erste Innendurchmesser (8).4. Jacket tube according to one of claims 1 to 3, characterized in that the second inner diameter (9) is at least 0.4 mm, preferably 2 mm, larger than the first inner diameter (8).
5. Mantelrohr nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die axiale (19) Erstreckung (5) der zweiten Zone (3) mindestens fünffach, vorzugsweise mindestens zehnfach, so groß ist wie der Unterschied zwischen dem ersten (8) und dem zweiten Innendurchmesser (9). 5. Jacket pipe according to one of claims 1 to 4, characterized in that the axial (19) extension (5) of the second zone (3) is at least five times, preferably at least ten times, as large as the difference between the first (8) and the second inner diameter (9).
6. Mantelrohr nach einem der Ansprüche 1 bis 5, wobei die dritte Zone (4) eine axiale (19) Ausdehnung (7) hat, dadurch gekennzeichnet, daß die Ausdehnung (7) größer ist als die Länge (5) der ersten Zone (2) und/oder die Erstreckung (6) der zweiten Zone (3).6. Jacket tube according to one of claims 1 to 5, wherein the third zone (4) has an axial (19) extension (7), characterized in that the extension (7) is greater than the length (5) of the first zone ( 2) and / or the extension (6) of the second zone (3).
7. Mantelrohr nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die dritte Zone (4) eine axiale (19) Ausdehnung (7) von 10 bis 50 mm aufweist.7. casing pipe according to one of claims 1 to 6, characterized in that the third zone (4) has an axial (19) dimension (7) of 10 to 50 mm.
8. Mantelrohr nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Mantelrohr (1) eine Dicke (20) von 0,1 bis 1,5 mm hat.8. Jacket tube according to one of claims 1 to 7, characterized in that the jacket tube (1) has a thickness (20) of 0.1 to 1.5 mm.
9. Katalytischer Konverter mit einem Mantelrohr (1) nach einem der Ansprüche 1 bis 8, insbesondere für ein Abgassystem einer Verbrennungskraftmaschine, dadurch gekennzeichnet, daß der katalytische9. Catalytic converter with a jacket tube (1) according to one of claims 1 to 8, in particular for an exhaust system of an internal combustion engine, characterized in that the catalytic
Konverter einen Wabenkörper (12) aus Blechlagen (18) aufweist, wobei der Wabenkörper (12) zumindest teilweise so strukturiert ist, daß dieser für ein Abgas in einer Strömungsrichtung (13) durchströmbar ist, wobei die erste Zone (2) des Mantelrohres (1) nahe einer Eintrittsstirnseite (16) und die dritte Zone (4) nahe einer Austrittsstirnseite (17) angeordnet ist und derConverter has a honeycomb body (12) made of sheet metal layers (18), the honeycomb body (12) being at least partially structured in such a way that an exhaust gas can flow through it in a flow direction (13), the first zone (2) of the casing tube (1 ) is arranged near an entry end face (16) and the third zone (4) near an exit end face (17) and the
Wabenkörper (12) in der ersten (2) und dritten Zone (4) mit dem Mantelrohr (1) fügetechnisch verbunden (14) ist.Honeycomb body (12) in the first (2) and third zone (4) is connected (14) to the casing tube (1) by joining technology.
10. Katalytischer Konverter nach Anspruch 9, dadurch gekennzeichnet, daß in der zweiten Zone (3) zwischen Mantelrohr (1) und Wabenkörper (12) ein10. Catalytic converter according to claim 9, characterized in that in the second zone (3) between the casing tube (1) and honeycomb body (12)
Hohlraum (15) mit Luft angeordnet ist. Cavity (15) is arranged with air.
EP01949350A 2000-06-02 2001-05-18 Jacket tube with thermally insulating beading Expired - Lifetime EP1287237B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10027404 2000-06-02
DE10027404A DE10027404A1 (en) 2000-06-02 2000-06-02 Jacket tube with thermally insulating beads
PCT/EP2001/005688 WO2001092691A1 (en) 2000-06-02 2001-05-18 Jacket tube with thermally insulating beading

Publications (2)

Publication Number Publication Date
EP1287237A1 true EP1287237A1 (en) 2003-03-05
EP1287237B1 EP1287237B1 (en) 2006-07-12

Family

ID=7644478

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EP01949350A Expired - Lifetime EP1287237B1 (en) 2000-06-02 2001-05-18 Jacket tube with thermally insulating beading

Country Status (8)

Country Link
US (1) US7670570B2 (en)
EP (1) EP1287237B1 (en)
JP (1) JP4618975B2 (en)
AU (1) AU2001270530A1 (en)
DE (2) DE10027404A1 (en)
ES (1) ES2267790T3 (en)
RU (1) RU2259490C2 (en)
WO (1) WO2001092691A1 (en)

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DE50305367D1 (en) * 2003-09-11 2006-11-23 Pankl Emission Control Systems Device for removing soot particles from an exhaust gas stream of internal combustion engines

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DE50110457D1 (en) 2006-08-24
AU2001270530A1 (en) 2001-12-11
JP4618975B2 (en) 2011-01-26
US7670570B2 (en) 2010-03-02
WO2001092691A1 (en) 2001-12-06
ES2267790T3 (en) 2007-03-16
EP1287237B1 (en) 2006-07-12
JP2004501309A (en) 2004-01-15
DE10027404A1 (en) 2001-12-06
US20030086836A1 (en) 2003-05-08
RU2259490C2 (en) 2005-08-27

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