EP0472009A1 - Exhaust gas purifying device with two exhaust gas treatment bodies one behind the other - Google Patents

Exhaust gas purifying device with two exhaust gas treatment bodies one behind the other Download PDF

Info

Publication number
EP0472009A1
EP0472009A1 EP91112673A EP91112673A EP0472009A1 EP 0472009 A1 EP0472009 A1 EP 0472009A1 EP 91112673 A EP91112673 A EP 91112673A EP 91112673 A EP91112673 A EP 91112673A EP 0472009 A1 EP0472009 A1 EP 0472009A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
gas treatment
wire mesh
housing
bodies
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
EP91112673A
Other languages
German (de)
French (fr)
Other versions
EP0472009B1 (en
Inventor
Georg Dipl.-Ing. Wirth
Siegfried Wörner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberspaecher Climate Control Systems GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
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 J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP0472009A1 publication Critical patent/EP0472009A1/en
Application granted granted Critical
Publication of EP0472009B1 publication Critical patent/EP0472009B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
    • F01N3/2857—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing the mats or gaskets being at least partially made of intumescent material, e.g. unexpanded vermiculite

Definitions

  • the invention relates to a device for cleaning internal combustion engine exhaust gases, in which at least two spaced-apart exhaust gas treatment bodies are held in a longitudinal direction in a housing.
  • Such devices with ceramic monoliths which are provided with a catalytically active coating, are known as exhaust gas treatment bodies.
  • exhaust gas treatment bodies are characterized in particular by the fact that two exhaust gas treatment bodies arranged one behind the other are easier to manufacture and cheaper than a correspondingly longer exhaust gas treatment body and that the cleaning effect is better because behind the first exhaust gas treatment body the partially cleaned exhaust gas is new across the flow cross section mixes before flowing through the second exhaust treatment body.
  • the problem is how to best bridge the distance between the two exhaust gas treatment bodies from the point of view of avoiding at least substantial external flow around the exhaust gas treatment bodies and ensuring reliable, positioning of the exhaust treatment bodies in the housing. So far, it has been considered necessary to provide a spacer ring made of sheet metal or rigid ceramic material in the space between the two exhaust gas treatment bodies. Such solutions are comparatively complex, in particular also because of the need to keep the intermediate rings in the correct position during assembly of the exhaust gas cleaning device (combination of the exhaust treatment bodies and the housing).
  • the invention has for its object to provide an exhaust gas cleaning device of the type mentioned, in which the bridging of the distance between the two exhaust gas treatment bodies is carried out in a cost-effective and assembly-friendly manner.
  • the device is characterized according to the invention by a wire mesh, which is placed in the mutually facing end regions of the two exhaust gas treatment bodies around their peripheral surfaces and bridges their distance.
  • exhaust gas treatment body primarily means ceramic or metallic bodies provided with a catalytically active coating and / or particle filter bodies, which can consist of metallic or ceramic material.
  • Particle filters are also known to consist of several filter elements, which together form the filter in their arrangement; Such arrangements are also included in the term “exhaust gas treatment body”. It is understood that the exhaust gas treatment bodies are designed so that the exhaust gas can flow through them.
  • the wire mesh is wrapped around the peripheral end portions of the two exhaust treatment bodies in a single layer, usually with some overlap at the peripheral end portions. It is pointed out, however, that the scope of the invention also includes designs in which the wire mesh is laid around essentially twice or even more often.
  • the expression “circumferential surfaces” does not mean that the exhaust gas treatment bodies must be circular in cross section. "Circumference” is only intended to denote that part of the surface of the exhaust gas treatment body in question which is not the entry end face and not the exit end face.
  • Preferred cross-sectional shapes of the exhaust gas treatment body are circular, oval, elliptical, rounded with a square, rounded with a triangle. Because of the most extensive rationalization effect, embodiments of the device according to the invention are preferred in which there is no other distance bridging ring between the edge regions of the mutually facing end faces of the two exhaust gas treatment bodies.
  • Wire mesh is naturally not gas-tight. Nevertheless, the wire mesh laid around represents a certain flow barrier for the exhaust gas to prevent it from flowing out of the space between the two exhaust gas treatment bodies. For higher requirements, however, it can be expedient to provide one or more layers of a ceramic fiber fabric or a glass fiber fabric around the wire mesh. It is advantageous if the last-mentioned fabric is at least a little longer in the longitudinal direction than the wire fabric, so that the two end edges of the wire fabric are covered.
  • the two exhaust gas treatment bodies are held in the housing by means of a mounting mat, which also bridges their spacing and overlaps the wire mesh.
  • the arrangement of exhaust gas treatment bodies, the wire bridging wire bridging and the mounting mat lying over it can be combined with the housing in a simple and efficient manner to assemble the device.
  • the mounting mat forms a continuous heat insulation layer between the exhaust gas treatment bodies or the exhaust gas-flowed space of the device and the housing, so that the exhaust gas treatment bodies desirably quickly reach and maintain their operating temperature and that the exterior of the housing does not desirably become excessively hot.
  • the term "superimposed” should not necessarily mean that they lie directly on top of one another, rather one or more intermediate layers may be present between the exhaust gas treatment bodies and the wire mesh on the one hand and the mounting mat on the other hand. It is even particularly preferred if, in particular, a ceramic fiber fabric or a glass fiber fabric is laid around on the inside of the mounting mat.
  • a ceramic fiber fabric or a glass fiber fabric is laid around on the inside of the mounting mat.
  • relative sliding movements between the housing with mounting mat on the one hand and the arrangement of exhaust gas treatment bodies and wire mesh on the other hand are easier; this is of particular importance for the behavior of the device under temperature changes between operating temperature and non-operating temperature.
  • the housing is usually made of sheet metal and therefore expands quite considerably at the comparatively high operating temperature, while the exhaust gas treatment bodies, in particular if they are made of ceramic, practically do not expand as the temperature rises.
  • the state that the wire mesh assumes in the spacing area between the two exhaust gas treatment bodies after the assembly of the device depends primarily on the deformation resistance of the wire mesh and on the pressure that the mounting mat, which is normally compressed between the housing and the exhaust gas treatment bodies, depends on from the outside exerts the wire mesh.
  • a first option high resistance to deformation of the wire mesh, relatively low pressure exerted by the mounting mat
  • the exhaust gas treatment bodies and the wire mesh are held by the "pre-tensioning" of the mounting mat against longitudinal displacement relative to the housing, with the exception of the relative movement described above in the case of thermal expansions and thermal contractions.
  • the wire mesh In a second possibility (pressure exerted by the mounting mat so large that the wire mesh is slightly deformed inward in the spacing area), the wire mesh assumes a position in the assembled state in which it is pressed a little inward in the spacing space, so that this results in a certain amount positive, additional fixation of the distance between the two exhaust gas treatment bodies arises. Incidents are possible, in particular the formation of a small step of the wire mesh at the transition from the peripheral surface of the relevant exhaust gas treatment body to the spacing area.
  • Inflatable mats which are known per se, consist essentially of ceramic fibers with mica embedding. As a result of the mica deposits, the inflatable mat tends to expand as the temperature rises, as a result of which a particularly secure holding of the exhaust gas treatment bodies is achieved even at higher temperatures of the device. It is pointed out that the inflatable mat does not necessarily have to go through the length of the two exhaust gas treatment bodies, including the spacing area, but can be divided into several inflatable mats, in particular one inflatable mat per exhaust gas treatment body. However, it is particularly preferred if the inflatable mat passes in the longitudinal direction, as described above in connection with the mounting mat.
  • the housing in front of the exhaust gas treatment bodies has a first transition area that widens in the flow direction and behind the exhaust gas treatment bodies has a second transition area that narrows in the flow direction; that in the over corridor area, an inner housing part is provided, which ends close in front of the adjacent exhaust gas treatment body; and that an insulating mat is arranged in a circumferential space between the respective housing part and the housing.
  • the insulating mats can each bridge the gap between the inner housing part and the adjacent exhaust gas treatment body, and the respective insulating mat can be protected on the inside in the gap area by a ceramic fiber fabric or by a glass fiber fabric. It is particularly preferred if the ceramic fiber fabric or the glass fiber fabric passes from the first gap area over the first exhaust gas treatment body, the metal fabric for the distance between the exhaust gas treatment bodies and the second exhaust gas treatment body to the second gap area.
  • the longitudinal direction of the device which has been mentioned several times in the preceding description, generally coincides at least essentially with the general direction of gas flow in the device.
  • the wires of the wire mesh are preferably very thin and in most cases lie in a diameter range from 0.04 to 0.6 mm.
  • the larger wire thicknesses are particularly suitable for those wire fabrics which are woven from thicker and thinner wires and are used in such a way that the thicker wires run essentially in the longitudinal direction of the device.
  • the illustrated exhaust gas purification device 2 has a housing 4 made of sheet steel, which is essentially cylindrical in the central region and is substantially frustoconical in FIG. 1 on the right and left thereof. Seen in cross section, the housing 4 consists of two half-shells, each with two outwardly bent longitudinal edges 6, which are welded with a longitudinal seam 8 when the device 2 is assembled.
  • the two essentially frustoconical areas are called the first transition area 10 (left in FIG. 1) and the second transition area 12 (right in FIG. 1).
  • An inner housing part 14 is provided in the transition regions 10 and 12, which is welded to the housing 4 at the inlet end or at the outlet end of the device 2 and ends at the other end close to an adjacent exhaust gas treatment body 16. With the exception of the respective area where the inner housing part 14 is welded to the housing 4, there is a circumferential spacing space between the inner housing part 14 and the housing 4. An insulating mat 18 is arranged in each of these spacing spaces. The insulating mat extends in each case over the gap region 20 between the relevant inner housing part 14 and the relevant exhaust gas treatment body 16 and surrounds a part of the inlet-side or outlet-side peripheral surface of the relevant exhaust gas treatment body 16.
  • the two exhaust gas treatment bodies 16 are held in the housing 4 at a mutual distance 22 by means of a swelling mat 24 which is passed between the two insulating mats 18.
  • the housing 4 has various circumferential beads.
  • the inner housing parts 14 also have a circumferential bead in their end regions closer to the exhaust gas treatment bodies 16.
  • a wire mesh 26 is wrapped in their mutually facing end regions, which bridges the spacing region 22 between the two exhaust gas treatment bodies 16.
  • the exhaust gas treatment bodies are drawn uncut. It can be seen in the more central area of the device how the wire mesh 26 bridges the spacing area of the two exhaust gas treatment bodies 16, and further up or down in FIG. 1 it can be seen how the wire mesh 26 covers a part of the peripheral surface of the exhaust gas treatment body 16 in question.
  • the variant above in FIG. 1 is a wire mesh which is woven from thicker wires running in the longitudinal direction of the device 2 and from thinner wires running in the circumferential direction.
  • a wire mesh is well bendable parallel to the thicker wires, so that it can be easily laid around the exhaust gas treatment body 16.
  • the thicker wires running in the longitudinal direction result in a relatively high resistance to deformation against deformation from the cylindrical surface of the wire mesh lying around bes 26 out particularly inside. Therefore, the upper wire mesh 26 is drawn in such a way that, without being pressed inwards in the spacing area 22, it passes from left-front to right-back in a substantially cylindrical shape.
  • the pressure of the inflatable mat 24 is chosen so large that the wire mesh 26 above in Fig. 1 on the facing end edges of the two exhaust gas treatment body 16 a little bit quasi gradually is pressed inside.
  • the wire mesh 26 shown in FIG. 1 below is a wire mesh in which the wires are woven together in the manner of a linen fabric, with warp and weft having the same wire thickness, but also a slightly different wire thickness.
  • the wires all run at approximately 45 ° to the longitudinal direction or gas flow direction of the device 2.
  • This wire mesh 26 has a lower resistance to deformation, so that in the spacing area 22 there is a slight deformation of the wire mesh 26 towards the inside in longitudinal section. This deformation results in a certain additional positional fixation of the exhaust gas treatment body 16 and to a certain extent keeps the exhaust gas flow flowing through the spacing area 22 away from the edge area of the inlet end face on the left in FIG. 1 of the exhaust gas treatment body 16 on the right in FIG. 1.
  • a ceramic fiber fabric or a glass fiber fabric 28 is also drawn, which is placed around the arrangement of the two exhaust gas treatment bodies 16 and the wire mesh 26 and in Fig. 1 on the left and in Fig. 1 on the right over the gap area 20 to a piece extends on the peripheral surface of the relevant inner housing part 14.
  • the inflatable mat 24 or the respective insulating mat 18 is placed around this fabric 28.
  • Fig. 1 a variant is drawn in which two ceramic fiber fabrics or glass fiber fabrics 28 are laid around in an analogous position, but only to cover the relevant gap area 20 and the joint area between the relevant insulating mat 18 and the inflatable mat 24, and not continuously therebetween. It goes without saying that the wire mesh 26 drawn at the top in FIG. 1 can be combined with the fabrics 28 drawn at the bottom in FIG. 1 and vice versa.
  • the wire mesh has a sufficiently high temperature resistance to withstand the temperatures occurring in internal combustion engine exhaust gases.
  • a particularly preferred material for the wires of the wire mesh 26 is stainless steel.
  • the wire mesh 26, the ceramic fiber mesh or glass fiber mesh 28, the insulating mat 18 and the inflatable mat 24 are each provided essentially in one layer (essentially with a butt joint or with a small circumferential overlap). However, you can also work in multiple layers.
  • the fabric 28 facilitates sliding movements between the exhaust gas treatment bodies 16 and the housing 4 as a result of thermal expansions or thermal contractions. In addition, the fabric 28 prevents attacks of the pulsating, hot gas on the mats 18 and 24.
  • the direction of exhaust gas flow through the device 2 is indicated by the arrow 34.

Landscapes

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

Abstract

Device for purifying the exhaust gases of an internal combustion engine, in which at least two spaced exhaust gas treatment bodies (16) are held in a casing (4) one behind the other in the longitudinal direction (34), characterised by a wire mesh (26) which is laid around the circumferential surfaces of the two exhaust gas treatment bodies (16) in the mutually facing end regions of the latter and bridges the gap (22) between them. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Reinigen von Verbrennungsmotor-Abgasen, bei der in einem Gehäuse in Längsrichtung hintereinander mindestens zwei beabstandete Abgasbehandlungskörper gehaltert sind.The invention relates to a device for cleaning internal combustion engine exhaust gases, in which at least two spaced-apart exhaust gas treatment bodies are held in a longitudinal direction in a housing.

Derartige Vorrichtungen mit keramischen Monolithen, die mit einer katalytisch wirkenden Beschichtung versehen sind, als Abgasbehandlungskörper sind bekannt. Im Vergleich zu Abgasreinigungsvorrichtungen mit nur einem Abgasbehandlungskörper zeichnen sie sich insbesondere dadurch aus, daß zwei hintereinander angeordnete Abgasbehandlungskörper leichter herstellbar und preisgünstiger sind als ein entsprechend längerer Abgasbehandlungskörper und daß die Reinigungswirkung besser ist, weil sich hinter dem ersten Abgasbehandlungskörper das teilgereinigte Abgas über den Strömungsquerschnitt neu mischt, ehe es durch den zweiten Abgasbehandlungskörper strömt.Such devices with ceramic monoliths, which are provided with a catalytically active coating, are known as exhaust gas treatment bodies. Compared to exhaust gas cleaning devices with only one exhaust gas treatment body, they are characterized in particular by the fact that two exhaust gas treatment bodies arranged one behind the other are easier to manufacture and cheaper than a correspondingly longer exhaust gas treatment body and that the cleaning effect is better because behind the first exhaust gas treatment body the partially cleaned exhaust gas is new across the flow cross section mixes before flowing through the second exhaust treatment body.

Bei Abgasreinigungsvorrichtungen mit Tandemanordnung der Abgasbehandlungskörper hat man mit dem Problem zu kämpfen, wie der Abstand zwischen den beiden Abgasbehandlungskörpern am günstigsten zu überbrücken ist unter den Gesichtspunkten der Vermeidung zumindest wesentlicher Außenumströmung der Abgasbehandlungskörper und der Sicherstellung zuverlässiger, positionierender Halterung der Abgasbehandlungskörper in dem Gehäuse. Bisher hat man es für erforderlich gehalten, in dem Abstandsbereich zwischen den beiden Abgasbehandlungskörpern einen Abstandsring aus Blech oder aus starrem Keramikmaterial vorzusehen. Derartige Lösungen sind vergleichsweise aufwendig, insbesondere auch wegen der Notwendigkeit, die Zwischenringe während des Zusammenbaus der Abgasreinigungsvorrichtung (Vereinigung der Abgasbehandlungskörper und des Gehäuses) in der richtigen Position zu halten.In exhaust gas purification devices with a tandem arrangement of the exhaust gas treatment bodies, the problem is how to best bridge the distance between the two exhaust gas treatment bodies from the point of view of avoiding at least substantial external flow around the exhaust gas treatment bodies and ensuring reliable, positioning of the exhaust treatment bodies in the housing. So far, it has been considered necessary to provide a spacer ring made of sheet metal or rigid ceramic material in the space between the two exhaust gas treatment bodies. Such solutions are comparatively complex, in particular also because of the need to keep the intermediate rings in the correct position during assembly of the exhaust gas cleaning device (combination of the exhaust treatment bodies and the housing).

Der Erfindung liegt die Aufgabe zugrunde, eine Abgasreinigungsvorrichtung der eingangs genannten Art verfügbar zu machen, bei der die Überbrükkung des Abstandsbereichs zwischen den beiden Abgasbehandlungskörpern auf eine kostengünstige und zusammenbaufreundliche Art erfolgt.The invention has for its object to provide an exhaust gas cleaning device of the type mentioned, in which the bridging of the distance between the two exhaust gas treatment bodies is carried out in a cost-effective and assembly-friendly manner.

Zur Lösung dieser Aufgabe ist die Vorrichtung erfindungsgemäß gekennzeichnet durch ein Drahtgewebe, das in den einander zugewandten Endbereichen der beiden Abgasbehandlungskörper um deren Umfangsoberflächen herumgelegt ist und deren Abstand überbrückt.To achieve this object, the device is characterized according to the invention by a wire mesh, which is placed in the mutually facing end regions of the two exhaust gas treatment bodies around their peripheral surfaces and bridges their distance.

Da das Drahtgewebe um die Endbereiche der beiden Abgasbehandlungskörper herumgelegt ist, ergibt sich ein völlig komplikationsfreier Zusammenbau der Vorrichtung. Mit der Ausdrucksweise "Reinigen von Verbrennungsmotor-Abgasen" sind in erster Linie die katalytische Umwandlung der Schadstoffgase CO, NOX und von Kohlenwasserstoffen in die unschädlichen Abgasbestandteile C02, H20 und N und/oder das Entfernen von Partikeln, häufig vereinfacht "Rußpartikeln" genannt, aus Dieselmotoren-Abgasen gemeint. Dementsprechend sind mit "Abgasbehandlungskörper" in erster Linie keramische oder metallische, mit einer katalytisch wirksamen Beschichtung versehene Körper und/oder Partikelfilterkörper, die aus metallischem oder keramischem Material bestehen können, gemeint. Bei den Partikelfiltern kennt man auch den Aufbau aus mehreren Filterelementen, die in ihrer Anordnung gemeinsam den Filter bilden; auch derartige Anordnungen werden mit dem Begriff "Abgasbehandlungskörper" umfaßt. Es versteht sich, daß die Abgasbehandlungskörper so ausgebildet sind, daß sie von dem Abgas durchströmt werden können.Since the wire mesh is wrapped around the end regions of the two exhaust gas treatment bodies, the assembly of the device is completely free of complications. With the expression "cleaning of internal combustion engine exhaust gases" are primarily the catalytic conversion of the pollutant gases CO, NO X and hydrocarbons into the harmless exhaust gas components C0 2 , H 2 0 and N and / or the removal of particles, often simplified "soot particles "from diesel engine exhaust gases. Accordingly, “exhaust gas treatment body” primarily means ceramic or metallic bodies provided with a catalytically active coating and / or particle filter bodies, which can consist of metallic or ceramic material. Particle filters are also known to consist of several filter elements, which together form the filter in their arrangement; Such arrangements are also included in the term "exhaust gas treatment body". It is understood that the exhaust gas treatment bodies are designed so that the exhaust gas can flow through them.

In den meisten Fällen ist das Drahtgewebe in einer einzigen Lage, normalerweise mit einer gewissen Überlappung an den Umfangs-Endbereichen, um die Umfangs-Endbereiche der beiden Abgasbehandlungskörper herumgelegt. Es wird jedoch darauf hingewiesen, daß zum Bereich der Erfindung auch Ausführungen gehören, bei denen das Drahtgewebe im wesentlichen zweifach oder sogar noch öfter herumgelegt ist. Die Ausdrucksweise "Umfangsoberflächen" bedeutet nicht, daß die Abgasbehandlungskörper im Querschnitt unbedingt kreisrund sein müssen. "Umfang" soll lediglich denjenigen Teil der Oberfläche des betreffenden Abgasbehandlungskörpers bezeichnen, der nicht die Eintrittsstirnfläche und nicht die Austrittsstirnfläche ist. Bevorzugte Querschnittsformen der Abgasbehandlungskörper sind kreisrund, oval, elliptisch, eckabgerundet viereckig, eckabgerundet dreieckig. Wegen des weitestgehenden Rationalisierungseffekts sind Ausbildungen der erfindungsgemäßen Vorrichtung bevorzugt, bei denen kein sonstiger Abstandsüberbrückungsring zwischen den Randbereichen der einander zugewandten Stirnseiten der beiden Abgasbehandlungskörper sitzt.In most cases, the wire mesh is wrapped around the peripheral end portions of the two exhaust treatment bodies in a single layer, usually with some overlap at the peripheral end portions. It is pointed out, however, that the scope of the invention also includes designs in which the wire mesh is laid around essentially twice or even more often. The expression "circumferential surfaces" does not mean that the exhaust gas treatment bodies must be circular in cross section. "Circumference" is only intended to denote that part of the surface of the exhaust gas treatment body in question which is not the entry end face and not the exit end face. Preferred cross-sectional shapes of the exhaust gas treatment body are circular, oval, elliptical, rounded with a square, rounded with a triangle. Because of the most extensive rationalization effect, embodiments of the device according to the invention are preferred in which there is no other distance bridging ring between the edge regions of the mutually facing end faces of the two exhaust gas treatment bodies.

Unter einer Vielzahl möglicher, einsetzbarer Drahtgewebe sind zwei besonders bevorzugt:

  • 1. Drahtgewebe, bei denen die Kette aus vergleichsweise dickeren Drähten und der Schuß aus vergleichsweise dünneren Drähten besteht. Diese Art von Drahtgeweben wird vorzugsweise so eingebaut, daß die dickeren Drähte im wesentlichen in der Längsrichtung der Abgasbehandlungskörper und die dünneren Drähte im wesentlichen in Umfangsrichtung der Abgasbehandlungskörper verlaufen.
  • 2. Drahtgewebe, bei denen Kette und Schuß, bestehend aus gleichdicken Drähten oder aus unterschiedlich dicken Drähten, nach Art eines Leinengewebes verwebt sind. In diesem Fall wird das Drahtgewebe vorzugsweise so eingesetzt, daß die Drähte der Kette und die Drähte des Schusses schräg zur Langsrichtung des Abgasbehandlungskörpers verlaufen.
Among a large number of possible usable wire meshes, two are particularly preferred:
  • 1. Wire mesh, in which the warp consists of comparatively thicker wires and the weft consists of comparatively thinner wires. This type of wire mesh is preferably installed so that the thicker wires run substantially in the longitudinal direction of the exhaust gas treatment body and the thinner wires substantially in the circumferential direction of the exhaust gas treatment body.
  • 2. Wire mesh in which the warp and weft, consisting of wires of the same thickness or of wires of different thickness, are woven in the manner of a linen fabric. In this case the wire mesh is preferably inserted in this way sets that the wires of the chain and the wires of the weft run obliquely to the longitudinal direction of the exhaust gas treatment body.

Drahtgewebe sind naturgemäß nicht gasdicht. Dennoch stellt das herumgelegte Drahtgewebe eine gewisse Strömungsbarriere für das Abgas gegen Hinausströmen aus dem Abstandsbereich zwischen den beiden Abgasbehandlungskörpern dar. Bei höheren Anforderungen kann es jedoch günstig sein, um das Drahtgewebe herum eine oder mehrere Lagen eines Keramikfasergewebes oder eines Glasfasergewebes vorzusehen. Es ist günstig, wenn das letztgenannte Gewebe in der Längsrichtung mindestens ein Stück länger ist als das Drahtgewebe, damit die beiden Endkanten des Drahtgewebes überdeckt werden.Wire mesh is naturally not gas-tight. Nevertheless, the wire mesh laid around represents a certain flow barrier for the exhaust gas to prevent it from flowing out of the space between the two exhaust gas treatment bodies. For higher requirements, however, it can be expedient to provide one or more layers of a ceramic fiber fabric or a glass fiber fabric around the wire mesh. It is advantageous if the last-mentioned fabric is at least a little longer in the longitudinal direction than the wire fabric, so that the two end edges of the wire fabric are covered.

In Weiterbildung der Erfindung ist bevorzugt, daß die beiden Abgasbehandlungskörper mittels einer Halterungsmatte in dem Gehäuse gehaltert sind, die auch deren Abstand überbrückt und das Drahtgewebe überlagert. Die Anordnung aus Abgasbehandlungskörpern, herumgelegtem abstands- überbrückendem Drahtgewebe und darüber herumgelegter Halterungsmatte ist zum Zusammenbau der Vorrichtung einfach und rationell mit dem Gehäuse vereinigbar. Die Halterungsmatte bildet eine durchgehende Wärmeisolationsschicht zwischen den Abgasbehandlungskörpern bzw. dem abgasdurchströmten Raum der Vorrichtung und dem Gehäuse, so daß die Abgasbehandlungskörper in wünschenswerter Weise rasch ihre Betriebstemperatur erreichen und behalten und daß das Gehäuse auf seiner Außenseite in wünschenswerter Weise nicht übermäßig heiß wird. Der Begriff "überlagert" soll nicht zwingend ein unmittelbares Aufeinanderliegen bedeuten, vielmehr kann zwischen den Abgasbehandlungskörpern und dem Drahtgewebe einerseits sowie der Halterungsmatte andererseits noch eine oder mehrere Zwischenlagen vorhanden sein. Es ist sogar besonders bevorzugt, wenn an der Innenseite der Halterungsmatte insbesondere ein Keramikfasergewebe oder ein Glasfasergewebe herumgelegt ist. Außer dem Vorteil des Schutzes der Halterungsmatte vor stärkerer Abgasbeaufschlagung ergibt sich dabei noch der weitere wesentliche Vorteil, daß Relativgleitbewegungen zwischen dem Gehäuse mit Halterungsmatte einerseits und der Anordnung aus Abgasbehandlungskörpern und Drahtgewebe andererseits leichter möglich sind; dies hat besondere Bedeutung für das Verhalten der Vorrichtung unter Temperaturänderungen zwischen Betriebstemperatur und Außerbetriebstemperatur. Das Gehäuse besteht normalerweise aus Blech und dehnt sich deshalb bei der vergleichsweise hohen Betriebstemperatur recht erheblich, während die Abgasbehandlungskörper, insbesondere wenn sie aus Keramik bestehen, sich bei steigender Temperatur praktisch nicht dehnen.In a further development of the invention, it is preferred that the two exhaust gas treatment bodies are held in the housing by means of a mounting mat, which also bridges their spacing and overlaps the wire mesh. The arrangement of exhaust gas treatment bodies, the wire bridging wire bridging and the mounting mat lying over it can be combined with the housing in a simple and efficient manner to assemble the device. The mounting mat forms a continuous heat insulation layer between the exhaust gas treatment bodies or the exhaust gas-flowed space of the device and the housing, so that the exhaust gas treatment bodies desirably quickly reach and maintain their operating temperature and that the exterior of the housing does not desirably become excessively hot. The term "superimposed" should not necessarily mean that they lie directly on top of one another, rather one or more intermediate layers may be present between the exhaust gas treatment bodies and the wire mesh on the one hand and the mounting mat on the other hand. It is even particularly preferred if, in particular, a ceramic fiber fabric or a glass fiber fabric is laid around on the inside of the mounting mat. In addition to the advantage of protecting the mounting mat from stronger exposure to exhaust gas, there is the further significant advantage that relative sliding movements between the housing with mounting mat on the one hand and the arrangement of exhaust gas treatment bodies and wire mesh on the other hand are easier; this is of particular importance for the behavior of the device under temperature changes between operating temperature and non-operating temperature. The housing is usually made of sheet metal and therefore expands quite considerably at the comparatively high operating temperature, while the exhaust gas treatment bodies, in particular if they are made of ceramic, practically do not expand as the temperature rises.

Der Zustand, den das Drahtgewebe nach dem Zusammenbau der Vorrichtung im Abstandsbereich zwischen den beiden Abgasbehandlungskörpern einnimmt, hängt in erster Linie vom Verformungswiderstand des Drahtgewebes und von dem Druck ab, den die - normalerweise zwischen dem Gehäuse und den Abgasbehandlungskörpern zusammengepreßte - Halterungsmatte von außen her auf das Drahtgewebe ausübt. Bei einer ersten Möglichkeit (hoher Verformungswiderstand des Drahtgewebes, relativ geringer, ausgeübter Druck der Halterungsmatte) ergibt sich praktisch kein Nach-innen-Drükken des Drahtgewebes im Abstandsbereich; die Abgasbehandlungskörper und das Drahtgewebe werden durch die "Vorspannung" der Halterungsmatte gegen Längsverschiebung relativ zu dem Gehäuse gehalten, mit Ausnahme der weiter vorn geschilderten Relativbewegung bei Wärmedehnungen und Wärmekontraktionen. Bei einer zweiten Möglichkeit (ausgeübter Druck der Halterungsmatte so groß, daß das Drahtgewebe im Abstandsbereich etwas nach innen verformt wird) nimmt das Drahtgewebe im zusammengebauten Zustand eine Position ein, in der es im Abstandsraum ein wenig nach innen gedrückt ist, so daß hierdurch eine gewisse formschlüssige, zusätzliche Fixierung des Abstands der beiden Abgasbehandlungskörper entsteht. Zwischenfälle sind möglich, insbesondere die Ausbildung einer kleinen Stufe des Drahtgewebes am Übergang von der Umfangsoberfläche des betreffenden Abgasbehandlungskörpers zu dem Abstandsbereich.The state that the wire mesh assumes in the spacing area between the two exhaust gas treatment bodies after the assembly of the device depends primarily on the deformation resistance of the wire mesh and on the pressure that the mounting mat, which is normally compressed between the housing and the exhaust gas treatment bodies, depends on from the outside exerts the wire mesh. In a first option (high resistance to deformation of the wire mesh, relatively low pressure exerted by the mounting mat), there is practically no inward pushing of the wire mesh in the spacing area; the exhaust gas treatment bodies and the wire mesh are held by the "pre-tensioning" of the mounting mat against longitudinal displacement relative to the housing, with the exception of the relative movement described above in the case of thermal expansions and thermal contractions. In a second possibility (pressure exerted by the mounting mat so large that the wire mesh is slightly deformed inward in the spacing area), the wire mesh assumes a position in the assembled state in which it is pressed a little inward in the spacing space, so that this results in a certain amount positive, additional fixation of the distance between the two exhaust gas treatment bodies arises. Incidents are possible, in particular the formation of a small step of the wire mesh at the transition from the peripheral surface of the relevant exhaust gas treatment body to the spacing area.

Es ist bevorzugt, die beiden Abgasbehandlungskörper mittels einer sogenannten Blähmatte in dem Gehäuse zu haltern. Blähmatten, die an sich bekannt sind, bestehen im wesentlichen aus Keramikfasern mit Glimmereinlagerung. Infolge der Glimmereinlagerungen hat die Blähmatte bei steigenden Temperaturen das Bestreben sich auszudehnen, wodurch eine besonders sichere Halterung der Abgasbehandlungskörper auch bei höheren Temperaturen der Vorrichtung erzielt wird. Es wird darauf hingewiesen, daß die Blähmatte nicht unbedingt über die Länge der beiden Abgasbehandlungskörper einschließlich des Abstandsbereichs durchgehen muß, sondern auf mehrere Blähmatten, insbesondere jeweils eine Blähmatte pro Abgasbehandlungskörper, aufgeteilt sein kann. Besonders bevorzugt ist jedoch, wenn die Blähmatte in Längsrichtung durchgeht, wie vorstehend im Zusammenhang mit der Halterungsmatte beschrieben.It is preferred to hold the two exhaust gas treatment bodies in the housing by means of a so-called inflation mat. Inflatable mats, which are known per se, consist essentially of ceramic fibers with mica embedding. As a result of the mica deposits, the inflatable mat tends to expand as the temperature rises, as a result of which a particularly secure holding of the exhaust gas treatment bodies is achieved even at higher temperatures of the device. It is pointed out that the inflatable mat does not necessarily have to go through the length of the two exhaust gas treatment bodies, including the spacing area, but can be divided into several inflatable mats, in particular one inflatable mat per exhaust gas treatment body. However, it is particularly preferred if the inflatable mat passes in the longitudinal direction, as described above in connection with the mounting mat.

Nach einer bevorzugten Ausgestaltung der Erfindung ist vorgesehen, daß das Gehäuse vor den Abgasbehandlungskörpern einen ersten Übergangsbereich, der sich in Strömungsrichtung erweitert, und hinter den Abgasbehandlungskörpern einen zweiten Übergangsbereich, der sich in Strömungsrichtung verengt, aufweist; daß in den Übergangsbereich jeweils ein Innengehäuseteil vorgesehen ist, das dicht vor dem benachbarten Abgasbehandlungskörper endet; und daß in einem umlaufenden Abstandsraum zwischen dem jeweiligen Gehäuseteil und dem Gehäuse eine Isoliermatte angeordnet ist. Auf diese Weise ist das Gehäuse durchgehend einschließlich der Übergangsbereiche von dem gasdurchströmten Raum isoliert. Die Isoliermatten können jeweils den Spalt zwischen dem Innengehäuseteil und dem benachbarten Abgasbehandlungskörper überbrücken, und die jeweilige Isoliermatte kann im Spaltbereich innen durch ein Keramikfasergewebe oder durch ein Glasfasergewebe geschützt sein. Besonders bevorzugt ist es, wenn das Keramikfasergewebe oder das Glasfasergewebe von dem ersten Spaltbereich über den ersten Abgasbehandlungskörper, das Metallgewebe für den Abstand zwischen den Abgasbehandlungskörpern und den zweiten Abgasbehandlungskörper bis zu dem zweiten Spaltbereich durchgeht.According to a preferred embodiment of the invention, it is provided that the housing in front of the exhaust gas treatment bodies has a first transition area that widens in the flow direction and behind the exhaust gas treatment bodies has a second transition area that narrows in the flow direction; that in the over corridor area, an inner housing part is provided, which ends close in front of the adjacent exhaust gas treatment body; and that an insulating mat is arranged in a circumferential space between the respective housing part and the housing. In this way, the housing is continuously insulated from the gas-flowed space, including the transition areas. The insulating mats can each bridge the gap between the inner housing part and the adjacent exhaust gas treatment body, and the respective insulating mat can be protected on the inside in the gap area by a ceramic fiber fabric or by a glass fiber fabric. It is particularly preferred if the ceramic fiber fabric or the glass fiber fabric passes from the first gap area over the first exhaust gas treatment body, the metal fabric for the distance between the exhaust gas treatment bodies and the second exhaust gas treatment body to the second gap area.

Die in der vorangehenden Beschreibung mehrfach angesprochene Längsrichtung der Vorrichtung fällt in der Regel zumindest im wesentlichen mit der generellen Gasströmungsrichtung in der Vorrichtung zusammen.The longitudinal direction of the device, which has been mentioned several times in the preceding description, generally coincides at least essentially with the general direction of gas flow in the device.

Die Drähte des Drahtgewebes sind - absolut gesehen - vorzugsweise sehr dünn und liegen in den meisten Fällen in einem Durchmesserbereich von 0,04 bis 0,6 mm. Die größeren Drahtdicken kommen insbesondere bei denjenigen Drahtgeweben in Betracht, die aus dickeren und dünneren Drähten gewebt sind und so eingesetzt sind, daß die dickeren Drähte im wesentlichen in Längsrichtung der Vorrichtung verlaufen.In absolute terms, the wires of the wire mesh are preferably very thin and in most cases lie in a diameter range from 0.04 to 0.6 mm. The larger wire thicknesses are particularly suitable for those wire fabrics which are woven from thicker and thinner wires and are used in such a way that the thicker wires run essentially in the longitudinal direction of the device.

Die Erfindung und Ausgestaltungen der Erfindung werden nachfolgend anhand zeichnerisch dargestellter Ausführungsbeispiele noch näher erläutert. Es zeigt:

  • Fig. 1 einen Längsschnitt durch die Längsachse einer Abgasreinigungsvorrichtung, wobei in der oberen Hälfte der Fig. 1 und in der unteren Hälfte der Fig. 1 unterschiedliche Ausführungsvarianten dargestellt sind;
  • Fig. 2 einen Teil-Querschnitt längs 11-11 in Fig. 1, wobei wiederum in der oberen Zeichnungshälfte und in der unteren Zeichnungshälfte unterschiedliche Ausführungsformen dargestellt sind.
The invention and refinements of the invention are explained in more detail below on the basis of exemplary embodiments shown in the drawings. It shows:
  • 1 shows a longitudinal section through the longitudinal axis of an exhaust gas purification device, different embodiment variants being shown in the upper half of FIG. 1 and in the lower half of FIG. 1;
  • Fig. 2 is a partial cross section along 11-11 in Fig. 1, again different embodiments are shown in the upper half of the drawing and in the lower half of the drawing.

Die gezeichnete Abgasreinigungsvorrichtung 2 besitzt ein Gehäuse 4 aus Stahlblech, das im mittleren Bereich im wesentlichen zylindrisch ist und in Fig. 1 rechts und links davon im wesentlichen kegelstumpfförmig ist. Im Querschnitt gesehen, besteht das Gehäuse 4 aus zwei Halbschalen jeweils mit zwei nach außen umgebogenen Längsrändern 6, die beim Zusammenbau der Vorrichtung 2 mit einer Längsnaht 8 verschweißt sind. Die beiden im wesentlichen kegelstumpfförmigen Bereiche werden erster Übergangsbereich 10 (links in Fig. 1) und zweiter Übergangsbereich 12 (rechts in Fig. 1) genannt.The illustrated exhaust gas purification device 2 has a housing 4 made of sheet steel, which is essentially cylindrical in the central region and is substantially frustoconical in FIG. 1 on the right and left thereof. Seen in cross section, the housing 4 consists of two half-shells, each with two outwardly bent longitudinal edges 6, which are welded with a longitudinal seam 8 when the device 2 is assembled. The two essentially frustoconical areas are called the first transition area 10 (left in FIG. 1) and the second transition area 12 (right in FIG. 1).

In den Übergangsbereichen 10 und 12 ist jeweils ein Innengehäuseteil 14 vorgesehen, das am Eintrittsende bzw. am Austrittsende der Vorrichtung 2 mit dem Gehäuse 4 verschweißt ist und am jeweils anderen Ende dicht vor einem benachbarten Abgasbehandlungskörper 16 endet. Mit Ausnahme des jeweiligen Bereichs, wo das Innengehäuseteil 14 mit dem Gehäuse 4 verschweißt ist, besteht ein umlaufender Abstandsraum zwischen dem Innengehäuseteil 14 und dem Gehäuse 4. In diesem Abstandsraum ist jeweils eine Isoliermatte 18 angeordnet. Die Isoliermatte erstreckt sich jeweils über den Spaltbereich 20 zwischen dem betreffenden Innengehäuseteil 14 und dem betreffenden Abgasbehandlungskörper 16 und umgibt ein Stück der eintrittsseitigen bzw. austrittsseitigen Umfangsoberfläche des betreffenden Abgasbehandlungskörpers 16.An inner housing part 14 is provided in the transition regions 10 and 12, which is welded to the housing 4 at the inlet end or at the outlet end of the device 2 and ends at the other end close to an adjacent exhaust gas treatment body 16. With the exception of the respective area where the inner housing part 14 is welded to the housing 4, there is a circumferential spacing space between the inner housing part 14 and the housing 4. An insulating mat 18 is arranged in each of these spacing spaces. The insulating mat extends in each case over the gap region 20 between the relevant inner housing part 14 and the relevant exhaust gas treatment body 16 and surrounds a part of the inlet-side or outlet-side peripheral surface of the relevant exhaust gas treatment body 16.

Die beiden Abgasbehandlungskörper 16 sind mit gegenseitigem Abstand 22 mittels einer zwischen den beiden Isoliermatten 18 durchgehenden, herumgelegten Blähmatte 24 in dem Gehäuse 4 gehaltert. Zur besseren Lagefixierung der beiden Isoliermatten 18 und der Blähmatte 24 weist das Gehäuse 4 diverse umlaufende Sicken auf. Auch die Innengehäuseteile 14 weisen in ihren den Abgasbehandlungskörpern 16 näheren Endbereichen jeweils eine umlaufende Sicke auf.The two exhaust gas treatment bodies 16 are held in the housing 4 at a mutual distance 22 by means of a swelling mat 24 which is passed between the two insulating mats 18. To better fix the position of the two insulating mats 18 and the inflatable mat 24, the housing 4 has various circumferential beads. The inner housing parts 14 also have a circumferential bead in their end regions closer to the exhaust gas treatment bodies 16.

Um die Umfangsoberflächen der beiden Abgasbehandlungskörper 16 ist in deren einander zugewandten Endbereichen ein Drahtgewebe 26 herumgelegt, das den Abstandsbereich 22 zwischen den beiden Abgasbehandlungskörpern 16 überbrückt. Zur deutlicheren Veranschaulichung sind die Abgasbehandlungskörper ungeschnitten gezeichnet. Man erkennt im zentraleren Bereich der Vorrichtung, wie das Drahtgewebe 26 den Abstandsbereich der beiden Abgasbehandlungskörper 16 überbrückt, und man erkennt weiter oben bzw. weiter unten in Fig. 1, wie das Drahtgewebe 26 jeweils ein Stück der Umfangsoberfläche des betreffenden Abgasbehandlungskörpers 16 überdeckt.Around the circumferential surfaces of the two exhaust gas treatment bodies 16, a wire mesh 26 is wrapped in their mutually facing end regions, which bridges the spacing region 22 between the two exhaust gas treatment bodies 16. For a clearer illustration, the exhaust gas treatment bodies are drawn uncut. It can be seen in the more central area of the device how the wire mesh 26 bridges the spacing area of the two exhaust gas treatment bodies 16, and further up or down in FIG. 1 it can be seen how the wire mesh 26 covers a part of the peripheral surface of the exhaust gas treatment body 16 in question.

Bei der Variante oben in Fig. 1 handelt es sich um ein Drahtgewebe, das aus dickeren, in Längsrichtung der Vorrichtung 2 verlaufenden Drähten und aus dünneren in Umfangsrichtung verlaufenden Drähten gewebt ist. Ein derartiges Drahtgewebe ist parallel zu den dickeren Drähten gut biegbar, so daß es gut um die Abgasbehandlungskörper 16 herumlegbar ist. Die in Längsrichtung verlaufenden, dickeren Drähte ergeben einen relativ hohen Verformungswiderstand gegenüber Verformung aus der Zylinderfläche des herumgelegten Drahtgewebes 26 heraus insbesondere nach innen. Deshalb ist das obere Drahtgewebe 26 so gezeichnet, daß es, ohne im Abstandsbereich 22 nach innen gedrückt zu sein, in im wesentlichen zylindrischer Form von links-vorn nach rechts-hinten durchgeht. Abweichend von der in Fig. oben gezeichneten Ausführungsform kann es jedoch so sein, daß der Druck der Blähmatte 24 so groß gewählt wird, daß das Drahtgewebe 26 oben in Fig. 1 an den einander zugewandten Stirnkanten der beiden Abgasbehandlungskörper 16 ein kleines Stück quasi stufenweise nach innen gedrückt wird.The variant above in FIG. 1 is a wire mesh which is woven from thicker wires running in the longitudinal direction of the device 2 and from thinner wires running in the circumferential direction. Such a wire mesh is well bendable parallel to the thicker wires, so that it can be easily laid around the exhaust gas treatment body 16. The thicker wires running in the longitudinal direction result in a relatively high resistance to deformation against deformation from the cylindrical surface of the wire mesh lying around bes 26 out particularly inside. Therefore, the upper wire mesh 26 is drawn in such a way that, without being pressed inwards in the spacing area 22, it passes from left-front to right-back in a substantially cylindrical shape. Deviating from the embodiment shown in Fig. Above, however, it can be such that the pressure of the inflatable mat 24 is chosen so large that the wire mesh 26 above in Fig. 1 on the facing end edges of the two exhaust gas treatment body 16 a little bit quasi gradually is pressed inside.

Das in Fig. 1 unten eingezeichnete Drahtgewebe 26 ist ein Drahtgewebe, bei dem die Drähte nach Art eines Leinengewebes miteinander verwebt sind, wobei Kette und Schuß in gleicher Drahtstärke, aber auch in etwas unterschiedlicher Drahtstärke gewählt sein können. Die Drähte verlaufen alle unter etwa 45° zur Längsrichtung bzw. Gasdurchströmungsrichtung der Vorrichtung 2. Dieses Drahtgewebe 26 hat einen geringeren Verformungswiderstand, so daß im Abstandsbereich 22 eine im Längsschnitt beulenartige, geringe Verformung des Drahtgewebes 26 nach innen stattfindet. Diese Verformung ergibt eine gewisse, zusätzliche Lagefixierung der Abgasbehandlungskörper 16 und hält den durch den Abstandsbereich 22 strömenden Abgasstrom in gewissem Ausmaß von dem Randbereich der in Fig. 1 linken Eintritts-Stirnseite des in Fig. 1 rechten Abgasbehandlungskörpers 16 fern.The wire mesh 26 shown in FIG. 1 below is a wire mesh in which the wires are woven together in the manner of a linen fabric, with warp and weft having the same wire thickness, but also a slightly different wire thickness. The wires all run at approximately 45 ° to the longitudinal direction or gas flow direction of the device 2. This wire mesh 26 has a lower resistance to deformation, so that in the spacing area 22 there is a slight deformation of the wire mesh 26 towards the inside in longitudinal section. This deformation results in a certain additional positional fixation of the exhaust gas treatment body 16 and to a certain extent keeps the exhaust gas flow flowing through the spacing area 22 away from the edge area of the inlet end face on the left in FIG. 1 of the exhaust gas treatment body 16 on the right in FIG. 1.

In Fig. 1 oben ist ferner ein Keramikfasergewebe oder ein Glasfasergewebe 28 eingezeichnet, das um die Anordnung aus den zwei Abgasbehandlungskörpern 16 und dem Drahtgewebe 26 herumgelegt ist und sich in Fig. 1 links sowie in Fig. 1 rechts über den Spaltbereich 20 bis ein Stück auf der Umfangsoberfläche des betreffenden Innengehäuseteils 14 erstreckt. Um dieses Gewebe 28 herumgelegt ist die Blähmatte 24 bzw. die jeweilige Isoliermatte 18.In Fig. 1 above, a ceramic fiber fabric or a glass fiber fabric 28 is also drawn, which is placed around the arrangement of the two exhaust gas treatment bodies 16 and the wire mesh 26 and in Fig. 1 on the left and in Fig. 1 on the right over the gap area 20 to a piece extends on the peripheral surface of the relevant inner housing part 14. The inflatable mat 24 or the respective insulating mat 18 is placed around this fabric 28.

In Fig. 1 unten ist eine Variante eingezeichnet, bei der an analoger Stelle zwei Keramikfasergewebe bzw. Glasfasergewebe 28 herumgelegt sind, allerdings nur zur Überdeckung des betreffenden Spaltbereichs 20 und des Stoßbereichs zwischen der betreffenden Isoliermatte 18 und der Blähmatte 24, und nicht dazwischen durchgehend. Es versteht sich, daß das in Fig. 1 oben gezeichnete Drahtgewebe 26 mit den in Fig. 1 unten gezeichneten Geweben 28 kombiniert sein kann und umgekehrt.In Fig. 1 below, a variant is drawn in which two ceramic fiber fabrics or glass fiber fabrics 28 are laid around in an analogous position, but only to cover the relevant gap area 20 and the joint area between the relevant insulating mat 18 and the inflatable mat 24, and not continuously therebetween. It goes without saying that the wire mesh 26 drawn at the top in FIG. 1 can be combined with the fabrics 28 drawn at the bottom in FIG. 1 and vice versa.

In Fig. 2 erkennt man wiederum den Aufbau der Vorrichtung 2 mit von innen nach außen Abgasbehandlungskörper 16, Drahtgewebe 26, gegebenenfalls Keramikfasergewebe bzw. Glasfasergewebe 28, Blähmatte 24, Gehäuse 4. In Fig. 2 oben erkennt man, daß das obere Drahtgewebe 26 in einer speziellen Webart gewebt ist, bei der die Schußdrähte 30 an einer Seite jeweils an zwei Kettendrähten 32 entlanggehen, ehe sie zur anderen Flachseite des Drahtgewebes 26 hinübergehen. Ein Beispiel dieser speziellen Webart ist die sogenannte Köperbindung.In Fig. 2 you can again see the structure of the device 2 with from the inside to the outside exhaust gas treatment body 16, wire mesh 26, possibly ceramic fiber or glass fiber fabric 28, inflatable mat 24, housing 4. In Fig. 2 above you can see that the upper wire mesh 26 in a special weave is woven, in which the weft wires 30 on one side each run along two chain wires 32 before they go over to the other flat side of the wire mesh 26. An example of this special weave is the so-called twill weave.

Es versteht sich, daß das Drahtgewebe eine ausreichend hohe Temperaturfestigkeit hat, um den bei Verbrennungsmotorabgasen auftretenden Temperaturen standzuhalten. Ein besonders bevorzugtes Material für die Drähte des Drahtgewebes 26 ist rostfreier Stahl. Bei den gezeichneten Ausführungsbeispielen sind das Drahtgewebe 26, das Keramikfasergewebe bzw. Glasfasergewebe 28, die Isoliermatte 18 und die Blähmatte 24 jeweils im wesentlichen einlagig (im wesentlichen mit Stumpfstoß oder mit kleiner Umfangsüberlappung) vorgesehen. Man kann jedoch jeweils auch mehrlagig arbeiten.It goes without saying that the wire mesh has a sufficiently high temperature resistance to withstand the temperatures occurring in internal combustion engine exhaust gases. A particularly preferred material for the wires of the wire mesh 26 is stainless steel. In the illustrated exemplary embodiments, the wire mesh 26, the ceramic fiber mesh or glass fiber mesh 28, the insulating mat 18 and the inflatable mat 24 are each provided essentially in one layer (essentially with a butt joint or with a small circumferential overlap). However, you can also work in multiple layers.

Es wird darauf hingewiesen, daß man statt des Vorsehens von zwei Isoliermatten 18 und einer Blähmatte 24 auch mit einer durchgehenden Halterungsmatte, entweder aus Blähmattenmaterial oder aus Keramikfasermaterial oder aus Glasfasermaterial arbeiten kann. Für die Matten 18 und 24 sind auch andere Materialien, insbesondere Drahtgestrick, möglich. Das Gewebe 28 erleichtert Gleitbewegungen zwischen den Abgasbehandlungskörpern 16 und dem Gehäuse 4 als Folge von Wärmedehnungen oder Wärmekontraktionen. Außerdem verhindert das Gewebe 28 Angriffe des pulsierenden, heißen Gases auf die Matten 18 und 24. Die Abgasdurchströmungsrichtung durch die Vorrichtung 2 ist mit dem Pfeil 34 bezeichnet.It is pointed out that instead of the provision of two insulating mats 18 and an inflatable mat 24, it is also possible to work with a continuous mounting mat, either made of inflatable mat material or of ceramic fiber material or of glass fiber material. Other materials, in particular wire mesh, are also possible for the mats 18 and 24. The fabric 28 facilitates sliding movements between the exhaust gas treatment bodies 16 and the housing 4 as a result of thermal expansions or thermal contractions. In addition, the fabric 28 prevents attacks of the pulsating, hot gas on the mats 18 and 24. The direction of exhaust gas flow through the device 2 is indicated by the arrow 34.

Claims (9)

1. Vorrichtung zum Reinigen von Verbrennungsmotor-Abgasen, bei der in einem Gehäuse (4) in Längsrichtung (34) hintereinander mindestens zwei beabstandete Abgasbehandlungskörper (16) gehaltert sind, gekennzeichnet durch ein Drahtgewebe (26), das in den einander zugewandten Endbereichen der beiden Abgasbehandlungskörper (16) um deren Umfangsoberflächen herumgelegt ist und deren Abstand (22) überbrückt.1. Device for cleaning internal combustion engine exhaust gases, in which in a housing (4) in the longitudinal direction (34) one behind the other at least two spaced exhaust gas treatment bodies (16) are held, characterized by a wire mesh (26) which in the mutually facing end regions of the two Exhaust gas treatment body (16) is wrapped around their peripheral surfaces and bridges their distance (22). 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Drahtgewebe (26) dickere Drähte (30), die im wesentlichen in der Längsrichtung (34) verlaufen, und dünnere Drähte (32), die im wesentlichen in Umfangsrichtung verlaufen, aufweist.2. Device according to claim 1, characterized in that the wire mesh (26) thicker wires (30) which extend substantially in the longitudinal direction (34), and thinner wires (32) which run substantially in the circumferential direction. 3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Drahtgewebe (26) Drähte aufweist, die nach Art eines Leinengewebes verwebt sind, und daß die Drähte schräg zur Längsrichtung (34) verlaufen.3. Apparatus according to claim 1, characterized in that the wire mesh (26) has wires which are woven in the manner of a linen fabric, and that the wires are inclined to Run in the longitudinal direction (34). 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß um das Drahtgewebe (26) ein Keramikfasergewebe (28) oder ein Glasfasergewebe (28) herumgelegt ist, das in der Längsrichtung (34) länger ist als das Drahtgewebe (26).4. Device according to one of claims 1 to 3, characterized in that a ceramic fiber fabric (28) or a glass fiber fabric (28) is placed around the wire mesh (26), which is longer in the longitudinal direction (34) than the wire mesh (26) . 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die beiden Abgasbehandlungskörper (16) mittels einer Halterungsmatte (24), die auch deren Abstand (22) überbrückt und das Drahtgewebe (26) überlagert, in dem Gehäuse (4) gehaltert sind.5. Device according to one of claims 1 to 4, characterized in that the two exhaust gas treatment body (16) by means of a mounting mat (24), which also bridges the distance (22) and overlying the wire mesh (26), in the housing (4) are supported. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das Drahtgewebe (26) im Bereich des Abstands (22) zwischen den beiden Behandlungskörpern (16) durch die Halterungsmatte (26) etwas nach innen gedrückt ist.6. The device according to claim 5, characterized in that the wire mesh (26) in the region of the distance (22) between the two treatment bodies (16) by the mounting mat (26) is pressed somewhat inwards. 7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die beiden Abgasbehandlungskörper (16) mittels einer herumgelegten Blähmatte (24) in dem Gehäuse (4) gehaltert sind.7. Device according to one of claims 1 to 6, characterized in that the two exhaust gas treatment body (16) are held in the housing (4) by means of an expanded mat (24). 8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Gehäuse (4) vor den Abgasbehandlungskörpern (16) einen ersten Übergangsbereich (10), der sich in Strömungsrichtung (34) erweitert, und hinter den Abgasbehandlungskörpern (16) einen zweiten Übergangsbereich (12), der sich in Strömungsrichtung verengt aufweist; daß in den Übergangsbereichen (10, 12) jeweils ein Innengehäuseteil (14) vorgesehen ist, das dicht vor dem benachbarten Abgasbehandlungskörper (16) endet; und daß in einem umlaufenden Abstandsraum zwischen dem jeweiligen Innengehäuseteil (14) und dem Gehäuse (4) eine Isoliermatte (18) angeordnet ist.8. Device according to one of claims 1 to 7, characterized in that the housing (4) in front of the exhaust gas treatment bodies (16) has a first transition region (10) which widens in the direction of flow (34), and behind the exhaust gas treatment bodies (16) second transition region (12) which is narrowed in the flow direction; that an inner housing part (14) is provided in the transition areas (10, 12), which ends close to the adjacent exhaust gas treatment body (16); and that an insulating mat (18) is arranged in a circumferential space between the respective inner housing part (14) and the housing (4). 9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Isoliermatten (18) jeweils den Spalt (20) zwischen dem Innengehäuseteil (14) und dem benachbarten Abgasbehandlungskörper (16) überbrücken und daß im Spaltbereich (20) die jeweilige Isoliermatte (18) innen durch ein Keramikfasergewebe (28) oder ein Glasfasergewebe (28) geschützt ist.9. The device according to claim 8, characterized in that the insulating mats (18) each bridge the gap (20) between the inner housing part (14) and the adjacent exhaust gas treatment body (16) and that in the gap region (20) the respective insulating mat (18) inside is protected by a ceramic fiber fabric (28) or a glass fiber fabric (28).
EP91112673A 1990-08-22 1991-07-27 Exhaust gas purifying device with two exhaust gas treatment bodies one behind the other Expired - Lifetime EP0472009B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4026566A DE4026566C2 (en) 1990-08-22 1990-08-22 Exhaust gas purification device with two exhaust gas treatment bodies in a row
DE4026566 1990-08-22

Publications (2)

Publication Number Publication Date
EP0472009A1 true EP0472009A1 (en) 1992-02-26
EP0472009B1 EP0472009B1 (en) 1994-03-30

Family

ID=6412695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91112673A Expired - Lifetime EP0472009B1 (en) 1990-08-22 1991-07-27 Exhaust gas purifying device with two exhaust gas treatment bodies one behind the other

Country Status (2)

Country Link
EP (1) EP0472009B1 (en)
DE (2) DE4026566C2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2703105A1 (en) * 1993-03-26 1994-09-30 Ecia Equip Composants Ind Auto Device for catalytic purification of the exhaust gases of an engine, especially of a motor vehicle
EP0719912A1 (en) * 1994-12-30 1996-07-03 Firma J. Eberspächer Exhaust gas treatment device of internal combustion engines
EP0724070A1 (en) * 1995-01-26 1996-07-31 Ngk Insulators, Ltd. Honeycomb catalytic converter
WO1999039086A1 (en) 1998-01-28 1999-08-05 J. Eberspächer Gmbh & Co. Method for mounting and insulating ceramic monoliths in an automobile exhaust system and a mounting produced according to this method
US20130035531A1 (en) * 2011-08-02 2013-02-07 Basf Se Reactor for carrying out an autothermal gas-phase dehydrogenation

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4220988C2 (en) * 1992-06-26 1998-02-19 Zeuna Staerker Kg Catalytic emission control device
CN102639227B (en) 2009-12-01 2014-10-01 巴斯夫欧洲公司 Reactor for carrying out autothermal gas phase dehydrogenation
US8802019B2 (en) 2010-12-21 2014-08-12 Basf Se Reactor for carrying out an autothermal gas-phase dehydrogenation
EA024781B1 (en) 2010-12-21 2016-10-31 Басф Се Reactor for carrying out autothermal gas phase dehydration
CN103702753B (en) 2011-08-02 2015-07-08 巴斯夫欧洲公司 Reactor for carrying out autothermal gas-phase dehydrogenation
US9012707B2 (en) 2011-08-02 2015-04-21 Basf Se Continuous process for carrying out autothermal gas-phase dehydrogenations
US9611191B2 (en) 2012-12-12 2017-04-04 Basf Se Reactor for carrying out an autothermal gas-phase dehydrogenation
WO2018024740A1 (en) 2016-08-02 2018-02-08 Basf Se Reactor for carrying out the autothermal gas phase dehydrogenation of a hydrocarbon-containing gas flow

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0256416A1 (en) * 1986-08-07 1988-02-24 Leistritz Aktiengesellschaft Exhaust gas cleaning device
EP0336115A1 (en) * 1988-04-02 1989-10-11 Leistritz Aktiengesellschaft Catalyst for exhaust gas with metallic monolith
DE3835841A1 (en) * 1988-10-21 1990-04-26 Eberspaecher J Exhaust converter for an internal combustion engine
EP0415101A1 (en) * 1989-09-02 1991-03-06 Leistritz Aktiengesellschaft Exhaust system, in particular, device for the purification of exhaust gas

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4239733A (en) * 1979-04-16 1980-12-16 General Motors Corporation Catalytic converter having a monolith with support and seal means therefor
DE3638049A1 (en) * 1986-11-07 1988-05-19 Leistritz Ag Exhaust gas purification apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0256416A1 (en) * 1986-08-07 1988-02-24 Leistritz Aktiengesellschaft Exhaust gas cleaning device
EP0336115A1 (en) * 1988-04-02 1989-10-11 Leistritz Aktiengesellschaft Catalyst for exhaust gas with metallic monolith
DE3835841A1 (en) * 1988-10-21 1990-04-26 Eberspaecher J Exhaust converter for an internal combustion engine
EP0415101A1 (en) * 1989-09-02 1991-03-06 Leistritz Aktiengesellschaft Exhaust system, in particular, device for the purification of exhaust gas

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2703105A1 (en) * 1993-03-26 1994-09-30 Ecia Equip Composants Ind Auto Device for catalytic purification of the exhaust gases of an engine, especially of a motor vehicle
EP0719912A1 (en) * 1994-12-30 1996-07-03 Firma J. Eberspächer Exhaust gas treatment device of internal combustion engines
EP0724070A1 (en) * 1995-01-26 1996-07-31 Ngk Insulators, Ltd. Honeycomb catalytic converter
US5782089A (en) * 1995-01-26 1998-07-21 Ngk Insulators, Ltd. Honeycomb catalytic converter
WO1999039086A1 (en) 1998-01-28 1999-08-05 J. Eberspächer Gmbh & Co. Method for mounting and insulating ceramic monoliths in an automobile exhaust system and a mounting produced according to this method
US20130035531A1 (en) * 2011-08-02 2013-02-07 Basf Se Reactor for carrying out an autothermal gas-phase dehydrogenation
US8852538B2 (en) * 2011-08-02 2014-10-07 Basf Se Reactor for carrying out an autothermal gas-phase dehydrogenation

Also Published As

Publication number Publication date
DE4026566A1 (en) 1992-02-27
DE59101268D1 (en) 1994-05-05
EP0472009B1 (en) 1994-03-30
DE4026566C2 (en) 1993-10-28

Similar Documents

Publication Publication Date Title
EP0275565B1 (en) Catalytic purification device for vehicle exhaust gases
EP0472009B1 (en) Exhaust gas purifying device with two exhaust gas treatment bodies one behind the other
DE3908887A1 (en) DEVICE FOR CATALYTIC DETOXIFICATION OR THE LIKE OF COMBUSTION ENGINE EXHAUST WITH TWO EXHAUST TREATMENT BODIES AND A PROTECTIVE RING BETWEEN
DE9005031U1 (en) Exhaust gas purification device
DE2302746A1 (en) CARRIER MATRIX FOR A CATALYTIC REACTOR FOR EXHAUST GAS CLEANING IN COMBUSTION MACHINES, ESPEC. GASOLINE ENGINES OF MOTOR VEHICLES AND A MANUFACTURING PROCESS
DE3341868A1 (en) MATRIX FOR A CATALYTIC REACTOR
DE3941919A1 (en) Exhaust gas purificn. arrangement - has two honeycombs with catalyst liners, metal housing, and flat corrugated strips
DE3744265C2 (en) Soot filter for exhaust gas cleaning in motor vehicles
DE102006026324A1 (en) Bypass filter with improved filter efficiency
EP0134002B1 (en) Diesel exhaust wire gauze filter and process for its manufacture
DE3835841C2 (en)
EP0285027B1 (en) Arrangement for mounting a catalyst in a casing in the exhaust system of a liquid fuel engine
DE3922667C2 (en) Device for catalytic detoxification for deblocking and / or soundproofing of internal combustion engine exhaust gases with a double-walled housing
EP0493705B1 (en) Apparatus for treating exhaust gases of internal combustion engines with two spaced exhaust treatment bodies
DE2400443A1 (en) Catalytic exhaust gas cleaner - has catalytic material spaced from cylindrical housing by corrugated steel packing
DE3926072A1 (en) Catalyser for purifying IC engine exhausts - has circumferential corrugation impressed into jacket surrounding catalyst support matrix
DE3820981C2 (en)
DE69629196T2 (en) CATALYST ARRANGEMENT
EP0561019B1 (en) Arrangement for positioning an inner shell in the casing of an exhaust device for vehicles
DE3821397A1 (en) Device for the catalytic cleaning of internal combustion engine exhaust gases
EP0177480B1 (en) Catalytic off gas purification device
DE10306462A1 (en) Exhaust gas cleaning unit, for an Internal Combustion motor, has disks within a housing between the inflow and outflow, to act as a soot filter and a catalyst for nitrogen oxide products
DE3817490A1 (en) Carrier body for a catalytic reactor for exhaust emission control
WO2001002705A1 (en) Device for treating exhaust gas
DE10223452A1 (en) Particle filter operating by means of soot combustion and used in diesel engines comprises filtering surface made from sintered metal between crude gas side and pure gas side

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE FR GB IT SE

17P Request for examination filed

Effective date: 19920325

17Q First examination report despatched

Effective date: 19930601

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed
AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR GB IT SE

ET Fr: translation filed
REF Corresponds to:

Ref document number: 59101268

Country of ref document: DE

Date of ref document: 19940505

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940414

EAL Se: european patent in force in sweden

Ref document number: 91112673.8

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20000609

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20000726

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20010618

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010727

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010731

BERE Be: lapsed

Owner name: EBERSPACHER G.M.B.H. & CO.

Effective date: 20010731

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20010727

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020728

REG Reference to a national code

Ref country code: FR

Ref legal event code: CJ

REG Reference to a national code

Ref country code: FR

Ref legal event code: CJ

EUG Se: european patent has lapsed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20040625

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050727

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060331

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20060331

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070731

Year of fee payment: 17

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090203