EP0121175A1 - Helically wound conical shape metal strip catalyst supporting matrix for internal-combustion engines - Google Patents
Helically wound conical shape metal strip catalyst supporting matrix for internal-combustion engines Download PDFInfo
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- EP0121175A1 EP0121175A1 EP84103016A EP84103016A EP0121175A1 EP 0121175 A1 EP0121175 A1 EP 0121175A1 EP 84103016 A EP84103016 A EP 84103016A EP 84103016 A EP84103016 A EP 84103016A EP 0121175 A1 EP0121175 A1 EP 0121175A1
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- Prior art keywords
- matrix
- metal strips
- supporting matrix
- width
- combustion engines
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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
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
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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
- F01N13/009—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 two or more separate purifying devices arranged in series
- F01N13/0097—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 two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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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
-
- 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
- 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
- F01N3/2821—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates the support being provided with means to enhance the mixing process inside the converter, e.g. sheets, plates or foils with protrusions or projections to create turbulence
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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
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
Definitions
- the present invention relates to a metallic carrier body for coatings of catalytically active substances for cleaning exhaust gases, in particular for internal combustion engines.
- These metallic catalyst carrier bodies consist of a carrier matrix with spirally wound, very thin-walled, smooth and / or corrugated metal strips, which are joined together in a circular-cylindrical or oval-cylindrical jacket tube by welding, soldering or adhesive bonding.
- German laid-open specification 29 05 241 describes a catalyst carrier body made of a conical winding, which is intended to improve the known cylindrical windings with regard to the flow, the heat load, the light-off behavior and the ability to be installed.
- This document relates to winding bodies in the normal and widely used dimensions and at no point attaches the necessary evaluation to the solution of the pending, however not considered thermal expansion problems in the radial direction to the diameter-length ratio. Accordingly, with the solution proposed there, as in the following set out in detail, the aforementioned alternating load breakage risk has not been eliminated.
- the object of the present invention is a catalyst carrier body made of smooth and / or corrugated, spirally wound and joined in a casing tube sheet metal strips, which avoids the disadvantages mentioned above.
- a catalyst body according to the first claim is proposed.
- the ratio of the width of the sheet metal strips to the pitch or the outer radius of the helical winding should be chosen such that no cross section through the winding cuts all layers of sheet metal strips, i.e. the axial_ dimension of the hollow-cone-like carrier matrix is greater than twice the width of the sheet metal strips.
- a catalyst carrier body designed in this way has the advantage that each cross section perpendicular to the longitudinal axis has only relatively narrow ring zones made of carrier matrix cells, which in the radial direction are not hampered by neighboring cells in the radial direction both outwards and inwards, and are therefore not subject to any plastic alternating deformations as in the case of the previous carrier bodies.
- the carrier matrix should have a truncated cone shape. If the height of the hollow truncated cone is still greater than twice the width of the winding tape, the advantages described so far are retained, so that the inner part can expand without being obstructed by the casing tube.
- the catalyst carrier body is W-shaped in longitudinal section. This shape results when the slope changes its sign at one point during the winding of the helical winding. If, in this case as well, the total axial extent of the helical winding exceeds twice the width of the winding tapes, the advantages described are retained. With this arrangement, which is particularly suitable for catalyst bodies of larger diameter, the installation dimensions are considerably reduced compared to the normal-conical shape, without restricting the flexibility of the matrix with regard to the freedom from expansion.
- the Shapes of the carrier matrix described so far can be produced by initially winding them and then pressing them into the desired shape.
- the carrier body should consist of a plurality of matrix sections arranged axially one behind the other with a clearance. Because of the narrower width of the winding tapes in accordance with the present invention, it may be that several matrix sections are necessary for adequate catalysis. The division of the total length of the catalytic converter into several narrow sections with free spaces in between leads to a further advantage in another respect. Calculations and tests have shown that with the usual dimensions and gas velocities in the parallel channels of the previous catalytic converters, the flow changes to the laminar state after about 20-30 mm, which is due to the lack of surface contacting for the chemical processes taking place in a catalytic converter of the exhaust gas is less favorable than a turbulent flow.
- each partial catalyst portion Due to the division into a plurality of partial catalyst bodies arranged one behind the other in the flow direction, each partial catalyst portion is only flowed through in the turbulent state / which considerably improves the catalytic efficiency.
- the exhaust gas exits the previous catalyst section into the intermediate space to the next section, the exhaust gas is mixed very well, which also contributes to improving the catalytic efficiency in terms of heat distribution, light-off behavior and conversion rate.
- the cone-like shape of the catalyst body proposed in the first claim flow direction of the hot exhaust gas is opposite.
- the hot exhaust gases are diverted from the center a little more than before to the peripheral areas of the catalyst body, so that the hot gases are distributed more uniformly than previously over the cross section of the catalyst body will.
- the conical catalyst carrier body 1 are attached in triplicate in the cylindrical jacket tube 2, which is connected via conical transition pieces 3 and 5 to the cylindrical pipe socket 4 and 6.
- the arrow on the pipe socket 4 shows the direction of flow of the incoming exhaust gas. It can be seen that the flow is distributed over the entire cross section of the catalyst body due to the conical shape and due to the resistance in the catalyst body.
- the catalyst bodies are wound in a manner known per se from a smooth 8 and a corrugated 7 sheet metal strip, the outer layer of a corrugated sheet metal strip, for example, abutting the inner surface of the casing tube 2.
- the sheet metal strips are wound comparatively narrow and helically.
- the width b of the metal strips and the pitch s of the helical winding, and the overall axial extent h of the helical windings are shown in FIG. 1. It can be seen that a cut perpendicular to the longitudinal axis of the catalyst carrier body can only cut all winding layers if the axial dimension h is more than twice as large as the width of the winding tapes b.
- FIG. 3 and 4 show further embodiments for the exhaust gas catalyst carrier body.
- 3 shows a frustoconical support matrix 9 and
- FIG. 4 shows a W-shaped shape 10. Viewed axially, these designs look as shown in FIG. 2.
Abstract
Description
Die vorliegende Erfindung betrifft einen metallischen Trägerkörper für Beschichtungen von katalytisch wirkenden Stoffen zur Reinigung von Abgasen, insbesondere für Verbrennungskraftmaschinen. Diese metallischen Katalysator-Trägerkörper bestehen aus einer Trägermatrix mit spiralig aufgewickelten, sehr dünnwandigen, glatten und/ oder gewellten Blechbändern, die in einem kreiszylindrischen oder auch ovalzylindrischen Mantelrohr fügetechnisch durch Schweißen, Löten oder Kleben miteinander verbunden sind.The present invention relates to a metallic carrier body for coatings of catalytically active substances for cleaning exhaust gases, in particular for internal combustion engines. These metallic catalyst carrier bodies consist of a carrier matrix with spirally wound, very thin-walled, smooth and / or corrugated metal strips, which are joined together in a circular-cylindrical or oval-cylindrical jacket tube by welding, soldering or adhesive bonding.
In,der deutschen Offenlegungsschrift 29 24 592.9 sind zahlreiche Lötverfahren zur Herstellung solcher Katalysator-Trägerkörper angedeutet und in Fig. 7 der entsprechenden Beschreibung ist auch ein Katalysator-Trägerkörper dargestellt, der eine besonders feste Lötverbindung zwischen seiner äußeren Lage und dem Mantelrohr bildet. Diese Katalysator-Trägerkörper werden beim Betrieb von Verbrennungskraftmaschinen, insbesondere Kraftfahrzeugmotoren, erheblichen und wechselnden thermischen und mechanischen Beanspruchungen ausgesetzt. Die dünnwandigen Bleche der Trägermatrix werden bei hoher Motorleistung in kürzester Zeit durch die katalytische Umsetzung des Abgases von ca:.500° C Betriebstemperatur örtlich. über mehr oder minder große Bereiche auf Temperaturen über 900° C erhitzt, während das sie umgebende dickwandige Mantelrohr seine durch äußere Luftkühlung relativ niedrige Betriebs- .temperatur von ca. 300° C noch längere Zeit beibehält und somit die Trägermatrix an einer spannungsfreien thermischen Ausdehnung ihres Volumens hindert. Die hierdurch bei hoher Temperatur entstehenden plastischen Druckverformungen der Trägermatrixzellen bewirken in der Abkühlungsphase durch trägheitsbedingte Temperaturgradienten zwischen Matrix und Mantelrohr hohe Zugbelastungen auf die Zellenwände und ihre Verbindungsstellen, die infolge der plastischen Wechselverformungen schon nach kurzer Betriebszeit reißen und in den Zonen hoher Wechselbeanspruchung zur Ablösung von ganzen Teilstücken des Trägermatrixkörpers führen können.In the German published patent application 29 24 592.9 numerous soldering methods for the production of such catalyst carrier bodies are indicated and in FIG. 7 of the corresponding description a catalyst carrier body is also shown which forms a particularly firm soldered connection between its outer layer and the jacket tube. These catalyst carrier bodies are exposed to considerable and changing thermal and mechanical loads during the operation of internal combustion engines, in particular motor vehicle engines. The thin-walled sheets of the carrier matrix are localized at high engine power in the shortest possible time by the catalytic conversion of the exhaust gas of approx.: 500 ° C operating temperature. heated over more or less large areas to temperatures above 900 ° C, while the surrounding thick-walled jacket pipe maintains its operating temperature of approx. 300 ° C, which is relatively low due to external air cooling, and thus preventing the carrier matrix from stress-free thermal expansion of its volume. The resulting plastic pressure deformations of the carrier matrix cells at high temperature cause high tensile loads on the cell walls and their connection points in the cooling phase due to inertia-related temperature gradients between the matrix and the casing tube Can lead sections of the carrier matrix body.
In Erprobungsversuchen mit Hochleistungs-Katalysatoren wurde eindeutig ermittelt, daß in Bezug auf die Stabilität und eine funktionsgerechte Lebensdauer von metallischen Katalysator-Trägerkörpern nicht nur die durch Gasdruck, Pulsation und Schwingungen erzeugten axialen und radialen Kräfte beachtet werden müssen, sondern die durch eine Dehnungsbehinderung bei der Erwärmung und Abkühlung der Trägermatrix hervorgerufenen radialen Wechselbelastungen von weitaus größerer Bedeutung sind.In trials with high-performance catalysts, it was clearly determined that not only the axial and radial forces generated by gas pressure, pulsation and vibrations have to be taken into account with regard to the stability and a functional lifetime of metallic catalyst carrier bodies, but also those caused by a strain hindrance in the Heating and cooling the radial alternating loads caused by the carrier matrix are of far greater importance.
In der deutschen Offenlegungsschrift 29 05 241 wird ein Katalysator-Trägerkörper aus einer konischen Wicklung beschrieben, der die bekannten zylindrischen Wicklungen bezüglich der Durchströmung, der Wärmebelastung, des Anspringverhaltens und der Einbaufähigkeit verbessern soll. Diese Schrift bezieht sich auf Wickelkörper in den normal üblichen und vielfach verwandten Abmessungen und mißt an keiner Stelle der Lösung der anstehenden, dort jedoch nicht angedachten thermischen Dehnungsprobleme in radialer Richtungdem Durchmesser-Längenverhältnis die erforderliche Wertung bei. Dementsprechend wird mit der dort vorgeschlagenen Lösung, wie im weiteren noch ausführlich dargelegt, die zuvor genannte Wechselbelastungs-Bruchgefahr nicht beseitigt.German laid-open specification 29 05 241 describes a catalyst carrier body made of a conical winding, which is intended to improve the known cylindrical windings with regard to the flow, the heat load, the light-off behavior and the ability to be installed. This document relates to winding bodies in the normal and widely used dimensions and at no point attaches the necessary evaluation to the solution of the pending, however not considered thermal expansion problems in the radial direction to the diameter-length ratio. Accordingly, with the solution proposed there, as in the following set out in detail, the aforementioned alternating load breakage risk has not been eliminated.
Aufgabe der vorliegenden Erfindung ist ein Katalysator-Trägerkörper aus glatten und/oder.gewellten, spiralig aufgewickelten und in einem Mantelrohr fügetechnisch befestigten Blechbändern, der die oben erwähnten Nachteile vermeidet.The object of the present invention is a catalyst carrier body made of smooth and / or corrugated, spirally wound and joined in a casing tube sheet metal strips, which avoids the disadvantages mentioned above.
Zur Lösung dieser Aufgabe wird ein Katalysatorkörper nach dem ersten Anspruch vorgeschlagen. Danach soll das Verhältnis von Breite der Blechbänder zu der Steigung bzw. dem äußeren Radius der wendelförmigen Wicklung so gewählt sein, daß kein Querschnitt durch die Wicklung alle Lagen von Blechbändern schneidet, d.h. die axiale_Abmessung der hohlkegelartigen Trägermatrix ist größer als die zweifache Breite der Blechbänder . Ein so gestalteter Katalysator-Trägerkörper hat den Vorteil, daß jeder Querschnitt senkrecht zur Längsachse nur relativ schmale Ringzonenaus Trägermatrixzellen aufweist, die in radialer Richtung sowohl nach außen wie nach innen nicht von Nachbarzellen in ihrer Dehnungsfreiheit behindert werden und somit keinen plastischen Wechselverformungen unterworfen sind wie bei den bisherigen Trägerkörpern. Da die Dehnungsspannungen der Matrixzellen in Bezug auf die über die Anströmfläche unterschiedlich verteilten Temperaturgradienten mit zunehmender Ringzonenbreite überproportional steigen,sind Trägerkörperstücke.mit geringer Blechbandbreite besonders vorteilhaft. Andererseits entfällt der erfindungsgemäße Vorteil einer ungehinderten radialen Dehnungsfreiheit der Matrixzellen bei Katalysator-Trägerkörpern deren Wickelbandbreite größer als die halbe axiale Ausdehnung der wendelförmigen Wicklung ist. Entsprechendes gilt auch für die Wickelbandbreite im Verhältnis zum äußeren Radius der Wicklung, weil das hohe Widerstandsmoment des gewellten Bandes quer zur Wellungsrichtung wegen der erforderlichen schraubenlinienförmigen Krümmung der Wellenlängsachse nur in geringem Maße eine konische Formung des Wickelkörpers in seiner Längsachse zuläßt. Bei zu großer.Wickelbandbreite verbleibt ein großer Teil der Länge des Trägerkörpers über die Gesamtfläche des Querschnitts senkrecht zur Längsachse vollkommen mit Zellstrukturen gefüllt, so daß in diesem Teil der Matrix die vorgenannten Probleme unverändert auftreten. Dies trifft auch für den oben genannten Katalysatorkörper entsprechend der DE-OS 29 05 241 zu.To achieve this object, a catalyst body according to the first claim is proposed. According to this, the ratio of the width of the sheet metal strips to the pitch or the outer radius of the helical winding should be chosen such that no cross section through the winding cuts all layers of sheet metal strips, i.e. the axial_ dimension of the hollow-cone-like carrier matrix is greater than twice the width of the sheet metal strips. A catalyst carrier body designed in this way has the advantage that each cross section perpendicular to the longitudinal axis has only relatively narrow ring zones made of carrier matrix cells, which in the radial direction are not hampered by neighboring cells in the radial direction both outwards and inwards, and are therefore not subject to any plastic alternating deformations as in the case of the previous carrier bodies. Since the expansion stresses of the matrix cells increase disproportionately with increasing ring zone width in relation to the temperature gradients distributed differently over the inflow surface, carrier body pieces with a small sheet metal strip width are particularly advantageous. On the other hand, the advantage according to the invention of unimpeded radial freedom from expansion of the matrix cells in the case of catalyst carrier bodies whose winding bandwidth is greater than half the axial extent of the helical winding is eliminated. The same applies to the winding tape width in the Ver Ratio to the outer radius of the winding, because the high section modulus of the corrugated tape transversely to the direction of corrugation allows only a slight conical shape of the winding body in its longitudinal axis due to the required helical curvature of the shaft longitudinal axis. If the winding bandwidth is too large, a large part of the length of the carrier body remains completely filled with cell structures over the entire area of the cross section perpendicular to the longitudinal axis, so that the aforementioned problems occur unchanged in this part of the matrix. This also applies to the above-mentioned catalyst body in accordance with DE-OS 29 05 241.
In weiterer Ausgestaltung der Erfindung wird vorgeschlagen, daß die Trägermatrix eine Hohlkegelstumpfform haben soll. Sofern die Höhe des Hohlkegelstumpfes dabei immer noch größer als die zweifache Breite des Wickelbandes ist, bleiben die bisher beschriebenen Vorteile erhalten,so daß sich der innere Teil ohne Behinderung durch das Mantelrohr ausdehnen kann.In a further embodiment of the invention it is proposed that the carrier matrix should have a truncated cone shape. If the height of the hollow truncated cone is still greater than twice the width of the winding tape, the advantages described so far are retained, so that the inner part can expand without being obstructed by the casing tube.
In weiterer Ausgestaltung der Erfindung wird im Anspruch 3 vorgeschlagen, daß der Katalysator-Trägerkörper im Längsschnitt W-förmig gestaltet ist. Diese Form ergibt sich, wenn die Steigung beim Wickeln der wendelförmigen Wicklung an-einer Stelle ihr Vorzeichen wechselt. Sofern auch in diesem Falle die gesamte axiale Ausdehnung der wendelförmigen Wicklung die zweifache Breite der Wickelbänder überschreitet, bleiben die beschriebenen Vorteile erhalten. Bei dieser Anordnung, die insbesondere für Katalysatorkörper von größerem Durchmesser geeignet ist, werden die Einbaumaße gegenüber der normalkegeligen Form erheblich reduziert, ohne die Flexibilität der Matrix hinsichtlich der Dehnungsfreiheit einzuschränken. Die bisher beschriebenen Formen der Trägermatrix lassen sich durch eine zunächst spiralige Wicklung und anschließendes Drücken in die gewünschte Form herstellen.In a further embodiment of the invention it is proposed in claim 3 that the catalyst carrier body is W-shaped in longitudinal section. This shape results when the slope changes its sign at one point during the winding of the helical winding. If, in this case as well, the total axial extent of the helical winding exceeds twice the width of the winding tapes, the advantages described are retained. With this arrangement, which is particularly suitable for catalyst bodies of larger diameter, the installation dimensions are considerably reduced compared to the normal-conical shape, without restricting the flexibility of the matrix with regard to the freedom from expansion. The Shapes of the carrier matrix described so far can be produced by initially winding them and then pressing them into the desired shape.
Im Anspruch 4 wird vorgeschlagen, daß der Trägerkörper aus mehreren mit Freiraumabstand axial hintereinander angeordneten Matrix-Teilstücken bestehen soll. Wegen der entsprechend dem vorliegenden Erfindungsgedanken geringeren Breite der Wickelbänder kann es sein, daß für eine ausreichende Katalyse mehrere Matrix-Teilstücke nötig sind. Die Aufteilung der Katalysator-Gesamtlänge in mehrere schmale Teilstücke mit dazwischenliegenden Freiräumen führt noch zu einem weiteren Vorteil in anderer Hinsicht. Berechnungen und Versuche haben gezeigt, daß bei den üblichen Abmessungen und den Gasgeschwindigkeiten in den parallelen.. Kanälen der bisherigen Abgaskatalysatoren die Strömung nach etwa 20 - 30 mm in den laminaren Zustand übergeht, der für die in einem Katalysator ablaufenden chemischen Vorgänge wegen der mangelnden Oberflächenkontaktierung des Abgases weniger günstig ist als eine turbulente Strömung. Durch die Aufteilung in mehrere in Strömungsrichtung hintereinander angeordnete Katalysator-Teilkörper wird jedes Katalysator-Teilstück nur im turbulenten Zustand angeströmt/wodurch die katalytische Wirksamkeit erheblich verbessert wird. Beim.Austritt des Abgases aus dem vorhergehenden Katalysator-Teilstück in den Zwischenfreiraum zum nächsten Teilstück entsteht eine sehr gute Durchmischung des Abgases,die in Bezug auf die Wärmeverteilung, das Anspringverhalten und die Umsatzrate ebenfalls zur Verbesserung des-katalytischen Wirkungsgrades beiträgt.In claim 4 it is proposed that the carrier body should consist of a plurality of matrix sections arranged axially one behind the other with a clearance. Because of the narrower width of the winding tapes in accordance with the present invention, it may be that several matrix sections are necessary for adequate catalysis. The division of the total length of the catalytic converter into several narrow sections with free spaces in between leads to a further advantage in another respect. Calculations and tests have shown that with the usual dimensions and gas velocities in the parallel channels of the previous catalytic converters, the flow changes to the laminar state after about 20-30 mm, which is due to the lack of surface contacting for the chemical processes taking place in a catalytic converter of the exhaust gas is less favorable than a turbulent flow. Due to the division into a plurality of partial catalyst bodies arranged one behind the other in the flow direction, each partial catalyst portion is only flowed through in the turbulent state / which considerably improves the catalytic efficiency. When the exhaust gas exits the previous catalyst section into the intermediate space to the next section, the exhaust gas is mixed very well, which also contributes to improving the catalytic efficiency in terms of heat distribution, light-off behavior and conversion rate.
Es erscheint zweckmäßig, daß die im ersten Anspruch vorgeschlagene kegelartige Form des Katalysatorkörpers der Anströmrichtung des heißen Abgases entgegengerichtet ist. Bei dieser Anordnung, die auch noch durch eine entsprechende konische Form des Gehäuses verbessert werden kann, werden die heißen Abgase von der Mitte etwas mehr als bisher zu den Randbezirken des Katalysatorkörpers umgeleitet, so daß die heißen Gase gleichmäßiger als bisher über den Querschnitt des Katalysatorkörpers verteilt werden.It seems appropriate that the cone-like shape of the catalyst body proposed in the first claim flow direction of the hot exhaust gas is opposite. In this arrangement, which can also be improved by a corresponding conical shape of the housing, the hot exhaust gases are diverted from the center a little more than before to the peripheral areas of the catalyst body, so that the hot gases are distributed more uniformly than previously over the cross section of the catalyst body will.
Die Figuren zeigen Ausführungsbeispiele der Erfindung.
- Fig. 1 zeigt einen Längsschnitt durch einen rotationssymmetrischen Abgaskatalysator, bestehend aus drei Katalysator-Teilkörpern von hohlkegeliger Form in einem zylindrischen Mantelrohr.
- Fig. 2 zeigt einen Querschnitt A-A durch Fig. 1.
- Fig. 3 zeigt die Schnittkontur eines einzelnen Katalysatorkörpers von kegelstumpfartiger Form.
- Fig. 4 zeigt ebenfalls die Schnittkontur eines einzelnen Katalysatorkörpers mit einem W-förmigen Längsschnitt.
- Fig. 1 shows a longitudinal section through a rotationally symmetrical catalytic converter, consisting of three catalytic converter bodies of hollow-conical shape in a cylindrical jacket tube.
- FIG. 2 shows a cross section AA through FIG. 1.
- Fig. 3 shows the sectional contour of a single catalyst body of the shape of a truncated cone.
- Fig. 4 also shows the sectional contour of a single catalyst body with a W-shaped longitudinal section.
In Fig. 1 sind die kegelförmigen Katalysator-Trägerkörper 1 in dreifacher Stückzahl in dem zylindrischen Mantelrohr 2 befestigt, das über konische Übergangsstücke 3 und 5 mit den zylindrischen Rohrstutzen 4 und 6 verbunden ist. Der Pfeil am Rohrstutzen 4 zeigt die Strömungsrichtung des eintretenden Abgases an. Es ist erkannbar, daß die Strömung aufgrund der konischen Form und aufgrund des Widerstandes im Katalysatorkörper auf den gesamten Querschnitt des Katalysatorkörpers verteilt wird. Die Katalysatorkörper sind, wie aus Fig. 2 ersichtlich ist, in an sich bekannter Weise aus jeweils einem glatten 8 und einem gewellten 7 Blechband aufgewickelt, wobei.z.B. die äußere Lage aus einem gewellten Blechband annder Innenfläche des Mantelrohres 2 anliegt. Entsprechend der vorliegenden Erfindung sind die Blechbänder vergleichsweise schmal und wendelförmig aufgewickelt. Die Breite b der Blechbänder und die Steigung s der wendelförmigen Wicklung, sowie die axiale Gesamtausdehnung h der wendelförmigen Wicklungen sind in Fig. 1 eingezeichnet. Es ist zu erkennen, daß ein Schnitt senkrecht zur Längsachse des Katalysator-Trägerkörpers nur dann niemals alle Wicklungslagen schneiden kann, wenn die axiale Ausdehnung h mehr als doppelt so groß ist wie die Breite der Wickelbänder b.In Fig. 1, the conical catalyst carrier body 1 are attached in triplicate in the cylindrical jacket tube 2, which is connected via
In Figl 3 und 4 werden weitere Ausgestaltungsformen für die Abgaskatalysator-Trägerkörper dargestellt. Dabei -zeigt Fig. 3 eine hohlkegelstumpfförmige Trägermatrix 9 und Fig. 4 eine W-förmige Form 10. Axial betrachtet sehen diese Ausführungen aus, wie in Fig. 2 dargestellt.3 and 4 show further embodiments for the exhaust gas catalyst carrier body. 3 shows a frustoconical support matrix 9 and FIG. 4 shows a W-
Claims (4)
dadurch gekennzeichnet , daß das Verhältnis von Breite (b) der Blechbänder (7,8) zu der Steigung (s) der Wendel bzw. dem Durchmesser der Trägermatrix so gewählt ist, daß kein Querschnitt durch die Wicklung alle Lagen von Blechbändern schneidet, d.h. die axiale Ausdehnung (h) der hohlkegelartigen Trägermatrix größer als die zweifache Breite (b) der Blechbänder (7, 8) ist.1. Catalyst carrier body for internal combustion engines made of a carrier matrix with smooth (8) and / or corrugated (7) metal strips, which are wound in a helical and / or spiral fashion and fastened in a casing tube (2) by joining technology,
characterized in that the ratio of the width (b) of the sheet metal strips (7, 8) to the pitch (s) of the helix or the diameter of the support matrix is selected such that no cross section through the winding cuts all layers of sheet metal strips, ie the axial extent (h) of the hollow-cone-like carrier matrix is greater than twice the width (b) of the metal strips (7, 8).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84103016T ATE25128T1 (en) | 1983-03-30 | 1984-03-19 | CATALYST CARRIER FOR INTERNAL COMBUSTION ENGINES MADE OF CONICALLY HELICALLY WRAPPED SHEET METAL STRIPS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833311724 DE3311724A1 (en) | 1983-03-30 | 1983-03-30 | CATALYST CARRIER BODY FOR INTERNAL COMBUSTION ENGINES MADE OF CONICALLY WINDED STRIPS |
DE3311724 | 1983-03-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0121175A1 true EP0121175A1 (en) | 1984-10-10 |
EP0121175B1 EP0121175B1 (en) | 1987-01-21 |
Family
ID=6195175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84103016A Expired EP0121175B1 (en) | 1983-03-30 | 1984-03-19 | Helically wound conical shape metal strip catalyst supporting matrix for internal-combustion engines |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0121175B1 (en) |
AT (1) | ATE25128T1 (en) |
DE (2) | DE3311724A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3638082A1 (en) * | 1986-11-07 | 1988-05-11 | Interatom | Exhaust pipe with hollow conical catalyst carrier bodies |
US5328774A (en) * | 1990-08-06 | 1994-07-12 | Emitec Gesellschaft Fur Emissionstechnologie Mbh | Monolithic metal honeycomb body with varying number of channels |
EP1215374A1 (en) * | 2000-12-14 | 2002-06-19 | Detroit Diesel Corporation | Emission control catalyst assembly for an engine of a motor vehicle |
CN1098410C (en) * | 1997-11-07 | 2003-01-08 | 发射技术有限公司 | Catalytic converter supported body with open heat radiating areas |
EP2221098B2 (en) † | 2009-02-16 | 2015-03-18 | NGK Insulators, Ltd. | Honeycomb structure |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3444472C1 (en) * | 1984-12-06 | 1986-02-13 | Daimler-Benz Ag, 7000 Stuttgart | Exhaust filter for diesel engines |
DE3543011A1 (en) * | 1985-12-05 | 1987-06-11 | Sueddeutsche Kuehler Behr | Matrix for a catalyst |
EP0245738B1 (en) * | 1986-05-12 | 1989-08-09 | INTERATOM Gesellschaft mit beschränkter Haftung | Metallic honeycomb body, particularly a catalyst carrier, provided with a supporting wall, and its manufacturing process |
DE8816514U1 (en) * | 1988-04-25 | 1989-10-26 | Emitec Emissionstechnologie | |
EP0478644B1 (en) * | 1989-06-20 | 1995-05-03 | Emitec Gesellschaft für Emissionstechnologie mbH | Process and device for generating heat through the flameless burning of a fuel in a gas current |
DE19650647A1 (en) * | 1996-12-06 | 1997-04-24 | Audi Ag | Energy-absorbing deformation element for vehicles |
US6109386A (en) * | 1998-02-03 | 2000-08-29 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Honeycomb body with a flattened cross-sectional region and a method for producing the honeycomb body |
DE102011081490A1 (en) * | 2011-08-24 | 2013-02-28 | Bayerische Motoren Werke Aktiengesellschaft | New catalyst with a support arranged in a cladding tube, where the catalyst support is from a honeycomb body having many flow direction of the exhaust gas extending channels, useful to purify exhaust gases from a combustion engine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2552615A (en) * | 1948-05-29 | 1951-05-15 | Lawrence F Baltzer | Muffler with spiral conical insert |
US2995200A (en) * | 1959-10-23 | 1961-08-08 | Seifert Vernon | Exhaust muffler for engines |
DE2905241A1 (en) * | 1979-02-12 | 1980-08-14 | Bremshey Ag | Catalyst carrier for engine exhaust purifier - has flat and corrugated catalyst-coated metal strips wound into conical honeycomb insert |
-
1983
- 1983-03-30 DE DE19833311724 patent/DE3311724A1/en not_active Withdrawn
-
1984
- 1984-03-19 EP EP84103016A patent/EP0121175B1/en not_active Expired
- 1984-03-19 AT AT84103016T patent/ATE25128T1/en not_active IP Right Cessation
- 1984-03-19 DE DE8484103016T patent/DE3462171D1/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2552615A (en) * | 1948-05-29 | 1951-05-15 | Lawrence F Baltzer | Muffler with spiral conical insert |
US2995200A (en) * | 1959-10-23 | 1961-08-08 | Seifert Vernon | Exhaust muffler for engines |
DE2905241A1 (en) * | 1979-02-12 | 1980-08-14 | Bremshey Ag | Catalyst carrier for engine exhaust purifier - has flat and corrugated catalyst-coated metal strips wound into conical honeycomb insert |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3638082A1 (en) * | 1986-11-07 | 1988-05-11 | Interatom | Exhaust pipe with hollow conical catalyst carrier bodies |
US5328774A (en) * | 1990-08-06 | 1994-07-12 | Emitec Gesellschaft Fur Emissionstechnologie Mbh | Monolithic metal honeycomb body with varying number of channels |
CN1098410C (en) * | 1997-11-07 | 2003-01-08 | 发射技术有限公司 | Catalytic converter supported body with open heat radiating areas |
EP1215374A1 (en) * | 2000-12-14 | 2002-06-19 | Detroit Diesel Corporation | Emission control catalyst assembly for an engine of a motor vehicle |
EP2221098B2 (en) † | 2009-02-16 | 2015-03-18 | NGK Insulators, Ltd. | Honeycomb structure |
Also Published As
Publication number | Publication date |
---|---|
DE3311724A1 (en) | 1984-10-04 |
EP0121175B1 (en) | 1987-01-21 |
DE3462171D1 (en) | 1987-02-26 |
ATE25128T1 (en) | 1987-02-15 |
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