EP1287237B1 - Jacket tube with thermally insulating beading - Google Patents
Jacket tube with thermally insulating beading Download PDFInfo
- Publication number
- EP1287237B1 EP1287237B1 EP01949350A EP01949350A EP1287237B1 EP 1287237 B1 EP1287237 B1 EP 1287237B1 EP 01949350 A EP01949350 A EP 01949350A EP 01949350 A EP01949350 A EP 01949350A EP 1287237 B1 EP1287237 B1 EP 1287237B1
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- EP
- European Patent Office
- Prior art keywords
- zone
- jacket tube
- casing tube
- honeycomb body
- face
- 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
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Classifications
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- 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
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- 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
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- 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 jacket tube, 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 jacket tube according to the preamble of claim 8.
- Such catalytic converters are preferably in a Used exhaust system of an internal combustion engine.
- the emission behavior of the exhaust system after the cold start of the internal combustion engine is in the foreground.
- catalytic converters are used for the purification of the exhaust gas.
- the catalytic converters have a catalytically active surface which causes a chemical conversion of the pollutants in the exhaust gas (for example carbon monoxide, hydrocarbon, nitrogen oxide) above a certain temperature (about 250 ° C.). It is important to minimize the time to reach this light-off temperature of the catalytic converter.
- a catalytic converter for purifying exhaust gases of an internal combustion engine of a motor vehicle with a carrier matrix of bonded metal foils and a jacket tube is known.
- the jacket tube has near its end faces a smaller inner diameter, as in a central region.
- the carrier matrix is fixed by the frontal areas of the jacket tube with a smaller inner diameter, wherein an additional welding or soldering connection is proposed for securing this press connection.
- the catalytic converter Due to the larger inner diameter in the central region of the jacket tube, the catalytic converter has a circumferential free space in the central region. This space serves as an insulation damper, which prevents heat transfer from the carrier matrix to the jacket tube in this area.
- the known catalytic converter is flowed through by the hot exhaust gas of the internal combustion engine, wherein, in particular in the cold start phase, a temperature gradient forms from the gas inlet side to the gas outlet side.
- the carrier matrix first reaches the required starting temperature of about 250 ° C. near the gas inlet side.
- the catalytic reaction is exothermic, that is, with the release of thermal energy, which additionally heats downstream regions of the support matrix. This heating behavior was not taken into account in the symmetrical design of the known catalytic converter.
- 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 allows a permanent connection of jacket tube and catalyst carrier body.
- the jacket tube according to the invention for a honeycomb body for exhaust gas treatment has a first zone near a first end face and a third zone near a second end face, wherein the jacket tube has a first inner diameter in the first and third zones. Furthermore, the jacket tube has a second zone, which is arranged between the first and the third zone, wherein the second zone has a second inner diameter, which is greater than the first inner diameter.
- the jacket tube according to the invention is characterized in that the first zone has an axial length less than 5 mm. Preferably, the first zone is designed with an axial length less than 3 mm.
- the first and the third zone with the smaller first inner diameter allow, for example, a technical joining of the jacket tube with a support body, if this is designed so that it has contact with the jacket tube in these zones.
- the technical joining connection can be produced, for example, by a known soldering method.
- the first zone Due to the temperature profile when heating a catalytic converter in an exhaust system, the first zone is made relatively narrow. This has the consequence that the contact of jacket tube and carrier matrix near the first end face is limited to a few millimeters, wherein a heat dissipation is reduced from the carrier body to the jacket tube.
- the first zone of the jacket 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 jacket tube and the catalyst carrier body is subject to high dynamic and thermal stress. So that the first zone ensures a permanent fixation of the support body in the jacket tube, at least a length of 1.5 mm is required for the design of a technical joining connection.
- the second zone has an extension of 10 to 40 mm.
- the second zone has an extension of 10 to 20 mm.
- the extent 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 thus also a heat discharge is prevented. Since the carrier body heats up rapidly due to the exothermic reactions in a catalytic reaction, it is sufficient to interrupt the contact of the carrier body and jacket tube only at the point near which the light-off temperature is reached after a short period of time.
- the second inner diameter is at least 0.4 mm, preferably 2 mm, larger than the first inner diameter.
- the distance between the jacket tube and a catalyst carrier body in the second zone is defined.
- 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 great as the difference between the first and the second inner diameter. This means, for example, that at a second inner diameter, which 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, wherein the axial extent is greater than the length of the first zone and / or the extent of the second zone.
- the third zone is therefore made relatively wide, whereby a permanent joining connection in the third zone is ensured with a catalyst carrier body. It is particularly advantageous if the third zone has an axial extent 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 is a lower thermal mass.
- a catalytic converter is proposed with the jacket tube according to the invention, in particular for use in a Exhaust system of an internal combustion engine is suitable.
- the catalytic converter has a honeycomb body of sheet metal layers, wherein the honeycomb body is at least partially structured so that it can be flowed through by an exhaust gas in a flow direction.
- the first zone of the jacket tube is arranged near an inlet end face and the third zone near an outlet end face of the catalytic converter.
- the honeycomb body is joined by joining technology in the first and the third zone with the jacket tube.
- the catalytic converter Due to the flow direction of the exhaust gas, the catalytic converter has a hotter inlet side in the cold start phase.
- the jacket tube is thus aligned so that the first zone is arranged close to 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, radially outermost regions of the honeycomb body are only flowed through by a relatively small amount of the exhaust gas, as a result of which the heating of these regions is slowed down.
- the first zone of the jacket tube is made relatively narrow, whereby the contact of the jacket tube is reduced with the honeycomb body.
- This narrow contact area is ensured even with a jacket tube, which projects beyond the inlet end face of the honeycomb body. It extends in this embodiment of the entrance end face of the honeycomb body to the second zone of the jacket tube. A faster heating of the honeycomb body near the entrance end face is guaranteed.
- a cavity with air is arranged in the second zone between the jacket 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.
- the jacket tube 1 shows a perspective view of the jacket 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 jacket tube 1 has a first inner diameter 8 in the first zone 2 and the third zone 4
- the jacket tube 1 has 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 greater than the first inner diameter 8.
- the first zone 2 has an axial length 19 of less than 5 mm, preferably less than 3 mm.
- the first zone 2 is followed by the second zone 3 with an axial extension 19, wherein the extension 6 is between 10 and 40 mm.
- the third zone 4 has an axial extension 7 which is greater than the length 5 of the first zone 2 and / or the extension 6 of the second zone 3.
- FIG. 2 shows a longitudinal section through an embodiment of a catalytic converter with a jacket tube 1 and a honeycomb body 12.
- the honeycomb body 12 can be traversed by an exhaust gas in a flow direction 13.
- the catalytic converter has an entrance end face 16 and an exit end face 17.
- the jacket tube 1 is so arranged that the first zone 2 is arranged near the entrance end face 16.
- a joining connection 14 with the honeycomb body 12 is formed.
- the illustrated honeycomb body 12 has sheet metal layers 18, which are at least partially structured so that the honeycomb body 12 can be flowed through for an exhaust gas. For this reason, it is particularly advantageous to perform the joining connection 14 with a Belotungsmaschinen.
- the second zone 3 connects with a cavity 15 between the honeycomb body 12 and jacket tube 1 at.
- This cavity is preferably filled with air, which prevents heat transfer from the honeycomb body 12 to the jacket tube 1 in the region of the second zone 3.
- the distance 21 between the honeycomb body 12 and jacket tube 3 is chosen so that even with a thermal expansion of the honeycomb body 12, contact with the jacket tube 1 in the second zone 3 is prevented.
- the third zone 4 extends from the second zone 3 to the exit end face 17.
- a joining connection 14 of the jacket tube 1 with the honeycomb body 12 does not extend over the entire axial 19 extent 7 of the third zone. 4
- the jacket tube is designed 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 thus has a lower thermal mass and ensures rapid heating in the cold start phase of a catalytic converter.
Description
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 Verbrennungskraftmaschine eingesetzt.The present invention relates to a jacket tube, 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 jacket tube according to the preamble of
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 Verbrennungskraftmaschine im Vordergrund. Zur Reinigung des Abgases werden katalytische Konverter eingesetzt. Die katalytischen Konverter weisen eine katalytisch 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.In order to meet the increasingly stringent emission limits worldwide, different emission control concepts are currently being pursued. In particular, the emission behavior of the exhaust system after the cold start of the internal combustion engine is in the foreground. For the purification of the exhaust gas catalytic converters are used. The catalytic converters have a catalytically active surface which causes a chemical conversion of the pollutants in the exhaust gas (for example carbon monoxide, hydrocarbon, nitrogen oxide) above a certain temperature (about 250 ° C.). It is important to minimize the time to reach this light-off temperature of the catalytic converter.
Aus der US 4,282,186 ist ein katalytischer Konverter zur Reinigung von Abgasen einer Verbrennungskraftmaschine 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.From US 4,282,186 a catalytic converter for purifying exhaust gases of an internal combustion engine of a motor vehicle with a carrier matrix of bonded metal foils and a jacket tube is known. The jacket tube has near its end faces a smaller inner diameter, as in a central region. The carrier matrix is fixed by the frontal areas of the jacket tube with a smaller inner diameter, wherein an additional welding or soldering connection is proposed for securing this press connection. Due to the larger inner diameter in the central region of the jacket tube, the catalytic converter has a circumferential free space in the central region. This space serves as an insulation damper, which prevents heat transfer from the carrier matrix to the jacket tube in this area.
Der bekannte katalytische Konverter wird von dem heißen Abgas der Verbrennungskraftmaschine durchströmt, wobei sich insbesondere in der Kaltstartphase ein Temperaturgefälle von der Gaseintrittsseite zur Gasaustrittsseite hin bildet. Demzufolge erreicht die Trägermatrix zuerst nahe der Gaseintrittsseite die erforderliche Apspringtemperatur 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.The known catalytic converter is flowed through by the hot exhaust gas of the internal combustion engine, wherein, in particular in the cold start phase, a temperature gradient forms from the gas inlet side to the gas outlet side. As a result, the carrier matrix first reaches the required starting temperature of about 250 ° C. near the gas inlet side. The catalytic reaction is exothermic, that is, with the release of thermal energy, which additionally heats downstream regions of the support matrix. 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.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 allows a permanent connection of jacket tube and catalyst carrier body.
Diese Aufgabe wird erfindungsgemäß durch ein Mantelrohr für einen Wabenkörper zur Abgasbehandlung, gemäß den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen sind in den abhängigen Ansprüchen angegeben.This object is achieved by a jacket tube for a honeycomb body for exhaust gas treatment, according to the features of claim 1. Advantageous developments are specified in the dependent claims.
Das erfindungsgemäße Mantelrohr für einen Wabenkörper zur Abgasbehandlung 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.The jacket tube according to the invention for a honeycomb body for exhaust gas treatment has a first zone near a first end face and a third zone near a second end face, wherein the jacket tube has a first inner diameter in the first and third zones. Furthermore, the jacket tube has a second zone, which is arranged between the first and the third zone, wherein the second zone has a second inner diameter, which is greater than the first inner diameter. The jacket tube according to the invention is characterized in that the first zone has an axial length less than 5 mm. Preferably, the first zone is designed with an axial length less than 3 mm.
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 first and the third zone with the smaller first inner diameter allow, for example, a technical joining of the jacket tube with a support body, if this is designed so that it has contact with the jacket tube in these zones. The technical joining connection can be produced, for example, by a known soldering method.
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.Due to the temperature profile when heating a catalytic converter in an exhaust system, the first zone is made relatively narrow. This has the consequence that the contact of jacket tube and carrier matrix near the first end face is limited to a few millimeters, wherein a heat dissipation is reduced from the carrier body to the jacket tube.
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 Verbrennungskraftmaschine 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 jacket 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. In this case, the jacket tube and the catalyst carrier body is subject to high dynamic and thermal stress. So that the first zone ensures a permanent fixation of the support body in the jacket tube, at least a length of 1.5 mm is required for the design of a technical 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.According to a further embodiment, the second zone has an extension of 10 to 40 mm. Preferred is an embodiment in which the second zone has an extension of 10 to 20 mm. In the case of a catalytic converter, the extent 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 thus also a heat discharge is prevented. Since the carrier body heats up rapidly due to the exothermic reactions in a catalytic reaction, it is sufficient to interrupt the contact of the carrier body and jacket tube only at the point near which the light-off temperature is reached after a short period of time.
Gemäß noch einer weiteren Ausführungsform 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 yet another embodiment, the second inner diameter is at least 0.4 mm, preferably 2 mm, larger than the first inner diameter. In this way, the distance between the jacket tube and a catalyst carrier body in the second zone is defined. The catalyst carrier body expands in the second zone during the cold start phase due to the increasing temperature. In order to prevent contact between the carrier body and the jacket 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 great as the difference between the first and the second inner diameter. This means, for example, that at a second inner diameter, which 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 jacket tube, the third zone has an axial extent, wherein the axial extent is greater than the length of the first zone and / or the extent of the second zone. The third zone is therefore made relatively wide, whereby a permanent joining connection in the third zone is ensured with a catalyst carrier body. It is particularly advantageous if the third zone has an axial extent of 10 to 50 mm.
Gemäß noch einer weiteren Ausführungsform 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 is a lower thermal mass.
Weiterhin wird ein katalytischer Konverter mit dem erfindungsgemäßen Mantelrohr vorgeschlagen, der insbesondere für den Einsatz in einem Abgassystem einer Verbrennungskraftmaschine 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 is proposed with the jacket tube according to the invention, in particular for use in a Exhaust system of an internal combustion engine is suitable. The catalytic converter has a honeycomb body of sheet metal layers, wherein the honeycomb body is at least partially structured so that it can be flowed through by an exhaust gas in a flow direction. The first zone of the jacket tube is arranged near an inlet end face and the third zone near an outlet end face of the catalytic converter. The honeycomb body is joined by joining technology in the first and the third zone with the jacket tube.
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 flow direction of the exhaust gas, the catalytic converter has a hotter inlet side in the cold start phase. The jacket tube is thus aligned so that the first zone is arranged close to 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, radially outermost regions of the honeycomb body are only flowed through by a relatively small amount of the exhaust gas, as a result of which the heating of these regions is slowed down. In order to reduce a dissipation of thermal energy near the inlet end face, the first zone of the jacket tube is made relatively narrow, whereby the contact of the jacket tube is reduced with the honeycomb body. This narrow contact area is ensured even with a jacket tube, which projects beyond the inlet end face of the honeycomb body. It extends in this embodiment of the entrance end face of the honeycomb body to the second zone of the jacket tube. A faster heating of the honeycomb body near the entrance end face is guaranteed.
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.According to a further embodiment, a cavity with air is arranged in the second zone between the jacket 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.
Nachfolgend werden Weiterbildungen und besonders bevorzugte Ausführungsformen des erfindungsgemäßen Mantelrohres anhand der Zeichnungen näher erläutert.In the following developments and particularly preferred embodiments of the jacket tube according to the invention will be explained in more detail with reference to the drawings.
Es zeigen:
- Fig. 1
- eine perspektivische Ansicht eines erfindungsgemäßen Mantelrohres und
- Fig. 2
- einen Längsschnitt durch eine Ausführungsform des erfindungsgemäßen Mantelrohres mit Wabenkörper.
- Fig. 1
- a perspective view of a jacket tube according to the invention and
- Fig. 2
- a longitudinal section through an embodiment of the jacket tube according to the invention with 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 das 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 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 die Erstreckung 6 zwischen 10 und 40 mm beträgt. Die dritte Zone 4 hat eine axiale 19 Ausdehnung 7, die größer als die Länge 5 der ersten Zone 2 und/oder die Erstreckung 6 der zweiten Zone 3 ist.1 shows a perspective view of the jacket tube 1 according to the invention with a
Fig. 2 zeigt einen Längsschnitt durch eine Ausführungsform eines katalytischen Konverters mit einem Mantelrohr 1 und einem Wabenkörper 12. Der Wabenkörper 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.2 shows a longitudinal section through an embodiment of a catalytic converter with a jacket tube 1 and a
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.
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
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 designed with a
- 11
- Mantelrohrcasing pipe
- 22
- erste Zonefirst zone
- 33
- zweite Zonesecond zone
- 44
- dritte Zonethird zone
- 55
- Längelength
- 66
- Erstreckungextension
- 77
- Ausdehnungexpansion
- 88th
- erster Innendurchmesserfirst inner diameter
- 99
- zweiter Innendurchmessersecond inner diameter
- 1010
- erste Stirnflächefirst end face
- 1111
- zweite Stirnflächesecond end face
- 1212
- Wabenkörperhoneycombs
- 1313
- Strömungsrichtungflow direction
- 1414
- Verbindungconnection
- 1515
- Hohlraumcavity
- 1616
- EintrittsstirnseiteInlet end side
- 1717
- AustrittsstirnseiteOutlet end side
- 1818
- Blechlagesheet metal layer
- 1919
- Achseaxis
- 2020
- Dickethickness
- 2121
- Abstanddistance
Claims (10)
- A casing tube for a honeycomb body (12) for treating exhaust gas, comprising a first zone (2) in the vicinity of a first end face (10) and a third zone (4) in the vicinity of a second end face (11), wherein said casing tube (1) has a first internal diameter (8) in the first (2) and third zone (4) and further has a second zone (3), which is disposed between said first (2) and said third zone (4), the second zone (3) having a second internal diameter (9) being greater than said first internal diameter (8), characterized in that said first zone (2) has an axial (19) length (5) of less than 5 mm, preferably less than 3 mm.
- Casing tube according to claim 1, characterized in that the first zone (2) of the casing tube (1) has an axial (19) length (5) of at least 1.5 mm.
- Casing tube according to claim 1 or 2, characterized in that the second zone (3) has an axial (19) elongation (6) of 10 to 40 mm, preferably of 10 to 20 mm.
- Casing tube according to anyone of claims 1 to 3, characterized in that the second internal diameter (9) is at least 0.4 mm, preferably 2 mm greater than the first internal diameter (8).
- Casing tube according to anyone of claims 1 to 4, characterized in that the axial (19) elongation (5) of the second zone (3) is at least 5 times, preferably at least 10 times as great as the difference between the first (8) and the second internal diameter (9).
- Casing tube according to one of claims 1 to 5, wherein said third zone (4) has an axial (19) extent (7), characterized in that the extent (7) is greater than the length (5) of the first zone (2) and/or the elongation (6) of said second zone (3).
- Casing tube according to one of claims 1 to 6, characterized in that said third zone (4) has an axial (19) extent (7) of 10 to 50 mm.
- Casing tube according to one of claims 1 to 7, characterized in that the casing tube (1) has a thickness (20) of 0.1 to 1.5 mm.
- A catalytic converter, comprising a casing tube (1) according to one of claims 1 to 8, particularly for an exhaust gas system of an internal combustion engine, wherein the catalytic converter has a honeycomb body (12) of sheet metal layers (18), the honeycomb body (12) being at least partially structured such that an exhaust gas can flow through said honeycomb body in a direction of flow (13), characterized in that said first zone (2) of said casing tube (1) is disposed close to an inlet end face (16) and said third zone (4) is disposed close to an outlet end face (17) and said honeycomb body (12) is connected to said casing tube (1) in said first (2) and third zone (4) by joining techniques.
- Catalytic converter according to claim 9, characterized in that a cavity (15) with air is disposed in said second zone (3) between the casing tube (1) and the honeycomb body (12).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10027404A DE10027404A1 (en) | 2000-06-02 | 2000-06-02 | Jacket tube with thermally insulating beads |
| DE10027404 | 2000-06-02 | ||
| PCT/EP2001/005688 WO2001092691A1 (en) | 2000-06-02 | 2001-05-18 | Jacket tube with thermally insulating beading |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1287237A1 EP1287237A1 (en) | 2003-03-05 |
| EP1287237B1 true EP1287237B1 (en) | 2006-07-12 |
Family
ID=7644478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10032023B4 (en) * | 2000-07-01 | 2009-04-16 | Volkswagen Ag | Catalytic converter with a thermal insulation |
| EP1734234A3 (en) * | 2003-09-11 | 2007-01-03 | Pankl Emission Control Systems GmbH | Device for elimination of carbon black particulates from an exhaust gas stream of an internal combustion engine |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53141166A (en) * | 1977-05-16 | 1978-12-08 | Chuo Hatsujo Kk | Honey comb catalytic converter and assembly method therefor |
| DE2856030A1 (en) * | 1978-12-23 | 1980-06-26 | Sueddeutsche Kuehler Behr | CARTRIDGE FOR EXHAUST GAS PURIFICATION |
| DE3338899C2 (en) * | 1983-03-22 | 1986-04-03 | Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim | Sealing ring |
| DE3518756A1 (en) * | 1985-05-24 | 1986-11-27 | Audi AG, 8070 Ingolstadt | EXHAUST PIPE FROM AN INTERNAL COMBUSTION ENGINE |
| DE3664361D1 (en) * | 1985-07-25 | 1989-08-17 | Interatom | Mounting device for a metallic flue gas catalyst support body, and method of manufacturing it |
| DE3701555C1 (en) * | 1987-01-21 | 1988-07-07 | Mannesmann Ag | Pipe connection for thin-walled, small-caliber metal pipes |
| JPH0721855Y2 (en) * | 1987-07-10 | 1995-05-17 | 日産自動車株式会社 | Catalytic converter device |
| US5104627A (en) * | 1988-12-19 | 1992-04-14 | Usui Kokusai Sangyo Kabushiki Kaisha | Exhaust gas cleaning apparatus |
| JPH0610132Y2 (en) * | 1988-12-19 | 1994-03-16 | 臼井国際産業株式社社 | Exhaust gas purification device |
| DE8905415U1 (en) * | 1989-04-28 | 1990-08-30 | Emitec Emissionstechnologie | |
| DE4109626A1 (en) * | 1991-03-23 | 1992-09-24 | Eberspaecher J | MOUNTING A CARRIER BODY IN VEHICLE EXHAUST SYSTEMS |
| JP2649461B2 (en) * | 1991-12-25 | 1997-09-03 | トヨタ自動車株式会社 | Carrier structure for exhaust gas purification catalyst |
| JP2620471B2 (en) * | 1992-09-29 | 1997-06-11 | 新日本製鐵株式会社 | Manufacturing method of diffusion bonded metal carrier |
| DE9317050U1 (en) * | 1993-11-08 | 1995-03-09 | Emitec Emissionstechnologie | Mechanically stabilized heating catalyst arrangement |
| US5916530A (en) * | 1994-08-29 | 1999-06-29 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Catalytic reactor |
| JPH08196917A (en) * | 1995-01-27 | 1996-08-06 | Usui Internatl Ind Co Ltd | Metal carrier and its manufacture |
| DE19521583B4 (en) * | 1995-06-14 | 2004-10-07 | Kaimer Gmbh & Co. Holding Kg | socket connection |
| DE19627289A1 (en) * | 1996-06-16 | 1997-12-18 | Andreas Dipl Ing Gifhorn | Catalyst assembly for e.g. exhaust gas purification |
| DE10032023B4 (en) * | 2000-07-01 | 2009-04-16 | Volkswagen Ag | Catalytic converter with a thermal insulation |
-
2000
- 2000-06-02 DE DE10027404A patent/DE10027404A1/en not_active Withdrawn
-
2001
- 2001-05-18 WO PCT/EP2001/005688 patent/WO2001092691A1/en active IP Right Grant
- 2001-05-18 EP EP01949350A patent/EP1287237B1/en not_active Expired - Lifetime
- 2001-05-18 DE DE50110457T patent/DE50110457D1/en not_active Expired - Lifetime
- 2001-05-18 JP JP2002500076A patent/JP4618975B2/en not_active Expired - Fee Related
- 2001-05-18 ES ES01949350T patent/ES2267790T3/en not_active Expired - Lifetime
- 2001-05-18 AU AU2001270530A patent/AU2001270530A1/en not_active Abandoned
- 2001-05-18 RU RU2002134910/06A patent/RU2259490C2/en not_active IP Right Cessation
-
2002
- 2002-12-02 US US10/308,078 patent/US7670570B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| RU2259490C2 (en) | 2005-08-27 |
| US20030086836A1 (en) | 2003-05-08 |
| EP1287237A1 (en) | 2003-03-05 |
| WO2001092691A1 (en) | 2001-12-06 |
| JP2004501309A (en) | 2004-01-15 |
| DE50110457D1 (en) | 2006-08-24 |
| ES2267790T3 (en) | 2007-03-16 |
| JP4618975B2 (en) | 2011-01-26 |
| AU2001270530A1 (en) | 2001-12-11 |
| DE10027404A1 (en) | 2001-12-06 |
| US7670570B2 (en) | 2010-03-02 |
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