EP0758048B1 - Device for catalytically purifying resp. decomposing hot exhaust gases - Google Patents

Device for catalytically purifying resp. decomposing hot exhaust gases Download PDF

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Publication number
EP0758048B1
EP0758048B1 EP96108231A EP96108231A EP0758048B1 EP 0758048 B1 EP0758048 B1 EP 0758048B1 EP 96108231 A EP96108231 A EP 96108231A EP 96108231 A EP96108231 A EP 96108231A EP 0758048 B1 EP0758048 B1 EP 0758048B1
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EP
European Patent Office
Prior art keywords
housing
housing part
parts
accordance
exhaust gases
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP96108231A
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German (de)
French (fr)
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EP0758048A1 (en
Inventor
Rainer Diez
Volkmar Dipl.-Ing. Knipps
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Friedrich Boysen GmbH and Co KG
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Friedrich Boysen GmbH and Co KG
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Publication of EP0758048A1 publication Critical patent/EP0758048A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N3/2867—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 placed at the front or end face of catalyst body
    • 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
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • F01N13/1894—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells the parts being assembled in longitudinal direction
    • 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 catalytic Cleaning or decomposition of hot exhaust gases in particular of an internal combustion engine.
  • Such devices are for example from the DE-A-40 24 015 and are known in practice in particular used for cleaning the exhaust gases from motor vehicles.
  • the catalyst bodies, the one on its outer circumference with a flexible covering are encased like an inflatable mat, as well as the spacer ring axially inserted into the housing, a stamp-like Tool at one end of the housing as a stop serves and the parts to be inserted into the housing from the other End of the housing by means of another stamp be pushed in and out one after the other.
  • a ceramic ring is used as a spacer element its outer circumference can be covered by an inflatable mat and is supported radially on the housing inner wall.
  • the ceramic ring lies with its front edges close to each other facing end faces of the catalyst body, so that the the core ring as well as the inflatable mats encasing the catalyst body shielded from the pulsations of the exhaust gases are.
  • Thermal insulation of the housing from the hot exhaust gases achieved because the ceramic ring in particular with him encasing inflatable mat a relatively good thermal shielding offers.
  • the arrangement of the ceramic ring or its production is comparatively expensive. This is especially true if that Housing has a cross-section deviating from the circular shape, for example, have an ellipse shape or the like should.
  • the object of the invention is a device for catalytic Cleaning or decomposition of hot exhaust gases at the beginning specified type, which is simple and in particular a small number of individual components in the interior of the housing through which the exhaust gas flows.
  • the device is said to advantageously be designed so that they have good thermal insulation in the area of the spacer.
  • the number of individual components can be those in the room through which the hot exhaust gas flows of the housing are present, minimize and thus the structure simplify the device for catalytic cleaning.
  • the device according to the invention is assembled in simply by placing the first catalyst body in the first housing part is inserted, then the second Housing part is inserted into the end region of the first housing part until the spacer element on the first catalyst body in contact comes and finally the second catalyst body into that second housing part is inserted.
  • the spacer element can be attached to the housing part by an additional Forming process in the manufacture of the corresponding Housing part are formed on the housing part.
  • the housing and the spacer element are preferred designed so that the spacer during the operation, in which the housing part its essentially freely selectable Receives external shape on which the housing part can be molded.
  • the spacer must be molded on a housing part does not take much effort and is in comparison inexpensive to use a ceramic ring.
  • the molding of the spacer on an existing sheet metal Housing part also has the advantage that Spacer compared to ceramic spacers can be relatively elastic, so that the spacer ring easily on the facing end faces the catalyst body can nestle and the different thermal expansion of the housing and the Catalyst body can be compensated.
  • the spacer element is designed such that it is with the inner wall of the outer housing part forms an essentially closed annulus, so that between the flow space for the exhaust gas and the housing an air gap is formed. This allows one achieve good thermal insulation of the housing, especially in the closed Annular space can also be arranged insulating material can.
  • the end region of the outer housing part is preferably expanded and is the transition to the expanded End area forming ring step of the outer housing part flat, i.e. with a slight inclination to the axial direction of the housing. This ensures that the insertion process of the inner housing part in the outer housing part in the area of the ring step braked by bending the widened end area and so the spacer is not firmly against the first inserted into the outer housing part Catalytic converter body bumps and damaged.
  • the device shown for catalytic cleaning or decomposition of exhaust gases from an internal combustion engine a housing 1 with a non-circular cross-section, the end connected to an inlet funnel 2 and an outlet funnel 3 is, the inlet funnel 2 with an engine side Exhaust pipe and the outlet funnel 3 with one to the atmosphere leading exhaust pipe is connectable.
  • the single-walled housing 1 are axially consecutive two catalyst bodies each encased by an inflation mat 4 5, 6 arranged by a spacer 7 from each other are spaced so that between the catalyst bodies 5, 6 a space 8 is created in which those entering through the inlet funnel 2 and the first Exhaust gases penetrating catalyst body 5 before entering can mix the second catalyst body 6.
  • the housing 1 is formed in two parts and comprises a first Housing part 9, in which the first catalyst body 5 is arranged, and a second housing part 10, in which the second catalyst body 6 is arranged.
  • the two Housing parts 9, 10 engage their mutually facing The end faces are interlocking and are with one another welded.
  • the first has to produce the positive connection Housing part 9 has an end region 11 which expands so far is that the end region of the second housing part 10 in a form-fitting manner that of the first housing part 9 can be inserted.
  • the end of the second engaging in the first housing part 9 Housing part 10 is the one that space the catalyst bodies 5, 6 Spacer 7 is formed and is due to the End faces of the catalyst body 5, 6.
  • the spacer 7 is designed as a ring element and on the second housing part 10 is formed and forms with the inner wall of the first housing part 9 an air space filled with air 12 between the flow of hot exhaust gases Area and the housing wall, creating a good thermal Insulation of the housing 1 from the hot exhaust gases guaranteed becomes.
  • the annular space 12 can additionally with a thermal insulation material to be filled to the insulation effect to increase.
  • the inner diameter of the spacer 7 is only slight smaller than the outer diameter of the catalyst body 5, 6, so that their mutually facing end faces from the spacer 7 are only slightly overlapped and largely the entire cross section of the catalyst body 5, 6 for the flowing exhaust gases is available.
  • the inlet and outlet funnels 2, 3 are each double-walled formed with outer parts 2 ', 3' and inner parts 2 '', 3 '', an air gap between them for thermal insulation remains, if necessary with a heat-insulating material can be filled.
  • the outlet funnel 3 is on attached to the second housing part 10. Because the second housing part 10 at its outlet funnel end has reduced diameter, the outer part 3 'of Outlet funnel 3 shaped so that it the inner part 3 ", which with the second housing part 10 a sliding seat forms, overlaps.
  • the annular gaps are on the end faces of the catalyst bodies 5, 6 between the inner wall of the housing 1 and the outer surface the catalyst body 5, 6 by ring elements 13 Steel wire mesh sealed. These ring elements 13 form also protect the edges of the catalyst bodies 5, 6 against damage.
  • the device for catalytic cleaning according to the invention or dismantling of hot exhaust gases is assembled as follows:
  • the two catalyst bodies 5, 6 are associated with the Inflatable mats 4 with stamp-like tools axially in it first housing part 9 inserted, the paragraph 15 to the End 14 of reduced diameter of the first housing part 9 and that provided on the end face of the second housing part 10 Spacer 7 serve as stops.
  • the inflatable mats 4 are intended to counter pulsations in the exhaust gases be shielded as these pulsations cause the inflatable mats 4 would destroy in the long run. For this reason, the Catalyst body 5, 6 and the second housing part 10 with pushed against each other with sufficient axial pressure, such that the spacer 7 facing each other End faces of the catalyst bodies 5, 6 each sealing is present.
  • a fixation of the catalyst body 5, 6 in the Housing parts 9, 10 takes place only in operation by the under Influence of swelling mats on the exhaust gases that swell 4.
  • the second housing part 10 is in the first housing part 9 inserted until it is on the first catalyst body 5 or the ring element 9 provided thereon, being the transition to the flared end area 11 forming flat ring step of the first housing part 9 brakes the insertion process so that the spacer 7th cannot hit hard against the first catalyst body 5 and damaged it.

Abstract

The housing (1) has a first part (9) for accommodating the first catalyser body (5) and a second housing part (10) for accommodating the second catalyser body (6). The housing parts interengage at their facing face sides. The end of the inwardly located housing part (10) is formed as the spacing distance component (7). The distance component forms with the inner wall of the outer housing part a closed ring space (12), which is filled with a heat-insulating material. The housing parts are tube parts or drawn parts partic. with a non-round cross-section and are welded to one another.

Description

Die Erfindung betrifft eine Vorrichtung zur katalytischen Reinigung bzw. Zerlegung von heißen Abgasen insbesondere eines Verbrennungsmotors.The invention relates to a device for catalytic Cleaning or decomposition of hot exhaust gases in particular of an internal combustion engine.

Derartige Vorrichtungen sind beispielsweise aus der DE-A-40 24 015 bekannt und werden in der Praxis insbesondere zur Reinigung der Abgase von Kraftfahrzeugen eingesetzt. Bei der Herstellung dieser Vorrichtungen werden die Katalysatorkörper, die auf ihrem Außenumfang mit einer nachgiebigen Umhüllung wie einer Blähmatte ummantelt sind, sowie der Distanzring axial in das Gehäuse eingeschoben, wobei ein stempelartiges Werkzeug am einen Ende des Gehäuses als Anschlag dient und die in das Gehäuse einzuschiebenden Teile vom anderen Ende des Gehäuses aus mittels eines weiteren Stempels nacheinander ein- und vorgeschoben werden.Such devices are for example from the DE-A-40 24 015 and are known in practice in particular used for cleaning the exhaust gases from motor vehicles. At in the manufacture of these devices, the catalyst bodies, the one on its outer circumference with a flexible covering are encased like an inflatable mat, as well as the spacer ring axially inserted into the housing, a stamp-like Tool at one end of the housing as a stop serves and the parts to be inserted into the housing from the other End of the housing by means of another stamp be pushed in and out one after the other.

Als Distanzelement wird ein Keramikring verwendet, der auf seinem Außenumfang von einer Blähmatte ummantelt sein kann und sich radial an der Gehäuseinnenwand abstützt. Der Keramikring liegt mit seinen Stirnrändern dicht an den einander zugewandten Stirnseiten der Katalysatorkörper an, so daß die den Kernring sowie die Katalysatorkörper ummantelnden Blähmatten gegenüber den Pulsationen der Abgase abgeschirmt sind. Darüberhinaus wird bei dieser bekannten Anordnung eine thermische Isolierung des Gehäuses gegenüber den heißen Abgasen erreicht, weil der Keramikring insbesondere mit der ihn ummantelnden Blähmatte eine relativ gute thermische Abschirmung bietet.A ceramic ring is used as a spacer element its outer circumference can be covered by an inflatable mat and is supported radially on the housing inner wall. The ceramic ring lies with its front edges close to each other facing end faces of the catalyst body, so that the the core ring as well as the inflatable mats encasing the catalyst body shielded from the pulsations of the exhaust gases are. In addition, in this known arrangement Thermal insulation of the housing from the hot exhaust gases achieved because the ceramic ring in particular with him encasing inflatable mat a relatively good thermal shielding offers.

Die Anordnung des Keramikrings bzw. dessen Herstellung ist vergleichsweise teuer. Dies gilt insbesondere dann, wenn das Gehäuse einen von der Kreisform abweichenden Querschnitt, beispielsweise eine Ellipsenform oder dergleichen, haben soll.The arrangement of the ceramic ring or its production is comparatively expensive. This is especially true if that Housing has a cross-section deviating from the circular shape, for example, have an ellipse shape or the like should.

Außerdem wird es häufig als nachteilig empfunden, daß die Anzahl von in dem Gehäuse angeordneten Einzelteilen bei der bekannten Vorrichtung zur katalytischen Reinigung bzw. Zerlegung von heißen Abgasen hoch ist.In addition, it is often considered disadvantageous that the Number of individual parts arranged in the housing at the known device for catalytic cleaning or Disassembly of hot exhaust gases is high.

Aufgabe der Erfindung ist es, eine Vorrichtung zur katalytischen Reinigung bzw. Zerlegung von heißen Abgasen der eingangs genannten Art anzugeben, welche einfach aufgebaut ist und insbesondere eine geringe Anzahl von einzelnen Bauteilen in dem vom Abgas durchströmten Innenraum des Gehäuses aufweist. Dabei soll die Vorrichtung in vorteilhafter Weise so ausgestaltet sein, daß sie eine gute thermische Isolierung im Bereich des Distanzelementes ermöglicht.The object of the invention is a device for catalytic Cleaning or decomposition of hot exhaust gases at the beginning specified type, which is simple and in particular a small number of individual components in the interior of the housing through which the exhaust gas flows. The device is said to advantageously be designed so that they have good thermal insulation in the area of the spacer.

Diese Aufgabe wird durch die Vorrichtung gemäß Anspruch 1 gelöst.This object is achieved by the device according to claim 1.

Durch die erfindungsgemäße vorgenommene Ausbildung des Distanzrings an dem Gehäuse läßt sich die Anzahl von Einzelbauteilen, die in dem vom heißen Abgas durchströmten Raum des Gehäuses vorhanden sind, minimieren und somit der Aufbau der Vorrichtung zur katalytischen Reinigung vereinfachen.Due to the inventive design of the spacer ring the number of individual components can be those in the room through which the hot exhaust gas flows of the housing are present, minimize and thus the structure simplify the device for catalytic cleaning.

Die Montage der erfindungsgemäßen Vorrichtung erfolgt in einfacher Weise, indem der erste Katalysatorkörper in das erste Gehäuseteil eingeschoben wird, anschließend das zweite Gehäuseteil in den Endbereich des ersten Gehäuseteils eingeschoben wird, bis das Distanzelement an dem ersten Katalysatorkörper in Anlage kommt und schließlich der zweite Katalysatorkörper in das zweite Gehäuseteil eingeschoben wird.The device according to the invention is assembled in simply by placing the first catalyst body in the first housing part is inserted, then the second Housing part is inserted into the end region of the first housing part until the spacer element on the first catalyst body in contact comes and finally the second catalyst body into that second housing part is inserted.

Dadurch, daß das Gehäuse in zwei axial aufeinanderfolgende Gehäuseteile unterteilt ist und jedes Gehäuseteil einen Katalysatorkörper aufnimmt, ist der Weg, den die Katalysatorkörper beim Zusammenbau der Vorrichtung jeweils in das Gehäuse eingeschoben werden müssen und damit die für den Einschiebevorgang erforderliche Zeit gering.The fact that the housing in two axially consecutive Housing parts is divided and each housing part is a catalyst body picks up is the way the catalyst body when assembling the device in the housing must be inserted and thus the for the insertion process time required is short.

Das Distanzelement kann an dem Gehäuseteil durch einen zusätzlichen Umformvorgang bei der Herstellung des entsprechenden Gehäuseteils an dem Gehäuseteil angeformt werden. Vorzugsweise sind das Gehäuse und das Distanzelement jedoch so ausgebildet, daß das Distanzelement bei dem Arbeitsgang, bei dem das Gehäuseteil seine im wesentlichen frei wählbare Außenform erhält, an dem Gehäuseteil angeformt werden kann.The spacer element can be attached to the housing part by an additional Forming process in the manufacture of the corresponding Housing part are formed on the housing part. However, the housing and the spacer element are preferred designed so that the spacer during the operation, in which the housing part its essentially freely selectable Receives external shape on which the housing part can be molded.

In jedem Fall erfordert die Anformung des Distanzelements an einem Gehäuseteil nicht viel Aufwand und ist im Vergleich zur Verwendung eines Keramikrings preisgünstig.In any case, the spacer must be molded on a housing part does not take much effort and is in comparison inexpensive to use a ceramic ring.

Die Anformung des Distanzelements an einem aus Blech bestehenden Gehäuseteil hat weiterhin den Vorteil, daß das Distanzelement im Vergleich zu Distanzelementen aus Keramikmaterial relativ elastisch ausgebildet sein kann, so daß sich der Distanzring leicht an die zugewandten Stirnseiten der Katalysatorkörper anschmiegen kann und auch die unterschiedlichen thermischen Ausdehnungen des Gehäuses und der Katalysatorkörper ausgeglichen werden können.The molding of the spacer on an existing sheet metal Housing part also has the advantage that Spacer compared to ceramic spacers can be relatively elastic, so that the spacer ring easily on the facing end faces the catalyst body can nestle and the different thermal expansion of the housing and the Catalyst body can be compensated.

In vorteilhafter Weise ist dabei das Distanzelement so ausgebildet, daß es mit der Innenwand des außenliegenden Gehäuseteils einen im wesentlichen geschlossenen Ringraum bildet, so daß zwischen dem Strömungsraum für das Abgas und dem Gehäuse ein Luftspalt gebildet wird. Dadurch läßt sich eine gute Wärmedämmung des Gehäuses erzielen, zumal in dem geschlossenen Ringraum auch noch Dämmaterial angeordnet sein kann.In an advantageous manner, the spacer element is designed such that it is with the inner wall of the outer housing part forms an essentially closed annulus, so that between the flow space for the exhaust gas and the housing an air gap is formed. This allows one achieve good thermal insulation of the housing, especially in the closed Annular space can also be arranged insulating material can.

Vorzugsweise ist der Endbereich des außenliegenden Gehäuseteils aufgeweitet und ist die den Übergang zu dem aufgeweiteten Endbereich bildendende Ringstufe des äußeren Gehäuseteils flach, d.h. mit geringer Neigung gegenüber der Axialrichtung des Gehäuses, ausgebildet. Hierdurch wird gewährleistet, daß der Einschiebevorgang des innenliegenden Gehäuseteils in das außenliegende Gehäuseteil im Bereich der Ringstufe unter Aufbiegung des aufgeweiteten Endbereichs abgebremst wird und damit das Distanzelement nicht fest gegen den in das außenliegende Gehäuseteil eingeschobenen ersten Katalysatorkörper stößt und beschädigt.The end region of the outer housing part is preferably expanded and is the transition to the expanded End area forming ring step of the outer housing part flat, i.e. with a slight inclination to the axial direction of the housing. This ensures that the insertion process of the inner housing part in the outer housing part in the area of the ring step braked by bending the widened end area and so the spacer is not firmly against the first inserted into the outer housing part Catalytic converter body bumps and damaged.

Hinsichtlich weiterer vorteilhafter Ausgestaltungen der Erfindung wird auf die Unteransprüche sowie auf die nachfolgende Erläuterung eines Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung zur katalytischen Reinigung bzw. Zerlegung von heißen Abgasen unter Bezugnahme auf die Zeichnung verwiesen. In der Zeichnung zeigt

Figur 1
einen schematisierten Axialschnitt einer erfindungsgemäßen Vorrichtung zur katalytischen Reinigung bzw. Zerlegung von heißen Abgasen und
Figur 2
die Vorrichtung von Figur 1 im Querschnitt.
With regard to further advantageous refinements of the invention, reference is made to the subclaims and to the following explanation of an exemplary embodiment of a device according to the invention for the catalytic cleaning or decomposition of hot exhaust gases with reference to the drawing. In the drawing shows
Figure 1
a schematic axial section of a device according to the invention for catalytic cleaning or decomposition of hot exhaust gases and
Figure 2
the device of Figure 1 in cross section.

Die dargestellte Vorrichtung zur katalytischen Reinigung bzw. Zerlegung von Abgasen eines Verbrennungsmotors besitzt ein Gehäuse 1 mit einem unrunden Querschnitt, das endseitig mit einem Einlaßtrichter 2 und einem Auslaßtrichter 3 verbunden ist, wobei der Einlaßtrichter 2 mit einer motorseitigen Abgasleitung und der Auslaßtrichter 3 mit einer zur Atmosphäre führenden Abgasleitung verbindbar ist.The device shown for catalytic cleaning or decomposition of exhaust gases from an internal combustion engine a housing 1 with a non-circular cross-section, the end connected to an inlet funnel 2 and an outlet funnel 3 is, the inlet funnel 2 with an engine side Exhaust pipe and the outlet funnel 3 with one to the atmosphere leading exhaust pipe is connectable.

In dem einwandigen Gehäuse 1 sind axial aufeinanderfolgend zwei jeweils durch eine Blähmatte 4 ummantelte Katalysatorkörper 5, 6 angeordnet, die durch ein Distanzelement 7 voneinander beabstandet sind, so daß zwischen den Katalysatorkörpern 5, 6 ein Abstandsraum 8 geschaffen wird, in dem sich die durch den Einlaßtrichter 2 eintretenden und den ersten Katalysatorkörper 5 durchsetzenden Abgase vor Eintritt in den zweiten Katalysatorkörper 6 durchmischen können.In the single-walled housing 1 are axially consecutive two catalyst bodies each encased by an inflation mat 4 5, 6 arranged by a spacer 7 from each other are spaced so that between the catalyst bodies 5, 6 a space 8 is created in which those entering through the inlet funnel 2 and the first Exhaust gases penetrating catalyst body 5 before entering can mix the second catalyst body 6.

Das Gehäuse 1 ist zweiteilig ausgebildet und umfaßt ein erstes Gehäuseteil 9, in welchem der erste Katalysatorkörper 5 angeordnet ist, und ein zweites Gehäuseteil 10, in welchem der zweite Katalysatorkörper 6 angeordnet ist. Die beiden Gehäuseteile 9, 10 greifen an ihren einander zugewandten Stirnseiten formschlüssig ineinander und sind miteinander verschweißt.The housing 1 is formed in two parts and comprises a first Housing part 9, in which the first catalyst body 5 is arranged, and a second housing part 10, in which the second catalyst body 6 is arranged. The two Housing parts 9, 10 engage their mutually facing The end faces are interlocking and are with one another welded.

Zur Herstellung der formschlüssigen Verbindung weist das erste Gehäuseteil 9 einen Endbereich 11 auf, der so weit aufgeweitet ist, daß der Endbereich des zweiten Gehäuseteils 10 formschlüssig in den des ersten Gehäuseteils 9 eingeschoben werden kann.The first has to produce the positive connection Housing part 9 has an end region 11 which expands so far is that the end region of the second housing part 10 in a form-fitting manner that of the first housing part 9 can be inserted.

Das in das erste Gehäuseteil 9 eingreifende Ende des zweiten Gehäuseteils 10 ist als das die Katalysatorkörper 5, 6 beabstandende Distanzelement 7 ausgebildet und liegt an den Stirnseiten der Katalysatorkörper 5, 6 an.The end of the second engaging in the first housing part 9 Housing part 10 is the one that space the catalyst bodies 5, 6 Spacer 7 is formed and is due to the End faces of the catalyst body 5, 6.

Das Distanzelement 7 ist als Ringelement ausgebildet und an das zweite Gehäuseteil 10 angeformt und bildet mit der Innenwand des ersten Gehäuseteils 9 einen mit Luft gefüllten Ringraum 12 zwischen dem von den heißen Abgasen durchströmten Bereich und der Gehäusewandung, wodurch eine gute thermische Isolierung des Gehäuses 1 gegenüber den heißen Abgasen gewährleistet wird. Der Ringraum 12 kann zusätzlich mit einem wärmedämmenden Material gefüllt sein, um den Isolierungseffekt zu erhöhen.The spacer 7 is designed as a ring element and on the second housing part 10 is formed and forms with the inner wall of the first housing part 9 an air space filled with air 12 between the flow of hot exhaust gases Area and the housing wall, creating a good thermal Insulation of the housing 1 from the hot exhaust gases guaranteed becomes. The annular space 12 can additionally with a thermal insulation material to be filled to the insulation effect to increase.

Der Innendurchmesser des Distanzelements 7 ist nur geringfügig kleiner als der Außendurchmesser der Katalysatorkörper 5, 6, so daß deren einander zugewandte Stirnseiten vom Distanzelement 7 nur wenig überlappt werden und weitestgehend der gesamte Querschnitt der Katalysatorkörper 5, 6 für die durchströmenden Abgase zur Verfügung steht.The inner diameter of the spacer 7 is only slight smaller than the outer diameter of the catalyst body 5, 6, so that their mutually facing end faces from the spacer 7 are only slightly overlapped and largely the entire cross section of the catalyst body 5, 6 for the flowing exhaust gases is available.

Die Einlaß- und Auslaßtrichter 2, 3 sind jeweils doppelwandig mit Außenteilen 2', 3' und Innenteilen 2'', 3'' ausgebildet, zwischen denen zur Wärmeisolierung ein Luftspalt frei bleibt, der gegebenenfalls mit einem wärmedämmenden Material gefüllt sein kann.The inlet and outlet funnels 2, 3 are each double-walled formed with outer parts 2 ', 3' and inner parts 2 '', 3 '', an air gap between them for thermal insulation remains, if necessary with a heat-insulating material can be filled.

Zur Verbindung des Einlaßtrichters 2 mit dem ersten Gehäuseteil 9 ist das Außenteil 2' des Einlaßtrichters 2 mit der Außenfläche des ersten Gehäuseteils 9 verschweißt, und das Innenteil 2'' ist auf das einlaßseitige Ende 14 des Gehäuseteils 9, welches einen verringerten Durchmesser aufweist, aufgesteckt und bildet mit diesem einen Schiebesitz.To connect the inlet funnel 2 with the first housing part 9 is the outer part 2 'of the inlet funnel 2 with the Welded outer surface of the first housing part 9, and that Inner part 2 '' is on the inlet end 14 of the housing part 9, which has a reduced diameter, attached and forms a sliding seat.

In grundsätzlich gleicher Weise ist der Auslaßtrichter 3 an dem zweiten Gehäuseteil 10 befestigt. Da das zweite Gehäuseteil 10 an seinem auslaßtrichterseitigen Ende keinen verringerten Durchmesser aufweist, ist das Außenteil 3' des Auslaßtrichters 3 so geformt, daß es das Innenteil 3", welches mit dem zweiten Gehäuseteil 10 einen Schiebesitz bildet, übergreift.In basically the same way, the outlet funnel 3 is on attached to the second housing part 10. Because the second housing part 10 at its outlet funnel end has reduced diameter, the outer part 3 'of Outlet funnel 3 shaped so that it the inner part 3 ", which with the second housing part 10 a sliding seat forms, overlaps.

An den Stirnseiten der Katalysatorkörper 5, 6 sind die Ringspalte zwischen der Innenwand des Gehäuses 1 und der Außenfläche der Katalysatorkörper 5, 6 durch Ringelemente 13 aus Stahldrahtgestrick abgedichtet. Diese Ringelemente 13 bilden auch einen Schutz der Kanten der Katalysatorkörper 5, 6 gegen Beschädigungen.The annular gaps are on the end faces of the catalyst bodies 5, 6 between the inner wall of the housing 1 and the outer surface the catalyst body 5, 6 by ring elements 13 Steel wire mesh sealed. These ring elements 13 form also protect the edges of the catalyst bodies 5, 6 against damage.

Die erfindungsgemäße Vorrichtung zur katalytischen Reinigung bzw. Zerlegung von heißen Abgasen wird wie folgt zusammengebaut:The device for catalytic cleaning according to the invention or dismantling of hot exhaust gases is assembled as follows:

Die beiden Katalysatorkörper 5, 6 werden mit den zugehörigen Blähmatten 4 mit stempelartigen Werkzeugen axial in das erste Gehäuseteil 9 eingeschoben, wobei der Absatz 15 zu dem Ende 14 verringerten Durchmessers des ersten Gehäuseteils 9 und das stirnseitig an dem zweiten Gehäuseteil 10 vorgesehene Distanzelement 7 als Anschläge dienen.The two catalyst bodies 5, 6 are associated with the Inflatable mats 4 with stamp-like tools axially in it first housing part 9 inserted, the paragraph 15 to the End 14 of reduced diameter of the first housing part 9 and that provided on the end face of the second housing part 10 Spacer 7 serve as stops.

Die Blähmatten 4 sollen gegenüber Pulsationen der Abgase abgeschirmt sein, da diese Pulsationen die Blähmatten 4 langfristig zerstören würden. Aus diesem Grund werden die Katalysatorkörper 5, 6 und das zweite Gehäuseteil 10 mit einem hinreichenden axialen Druck gegeneinander geschoben, derart, daß das Distanzelement 7 an den einander zugewandetn Stirnseiten der Katalysatorkörper 5, 6 jeweils dichtend anliegt.The inflatable mats 4 are intended to counter pulsations in the exhaust gases be shielded as these pulsations cause the inflatable mats 4 would destroy in the long run. For this reason, the Catalyst body 5, 6 and the second housing part 10 with pushed against each other with sufficient axial pressure, such that the spacer 7 facing each other End faces of the catalyst bodies 5, 6 each sealing is present.

Eine Fixierung der Katalysatorkörper 5, 6 in den Gehäuseteilen 9, 10 erfolgt erst im Betrieb durch die unter Hitzeeinwirkung der Abgase aufquellenden Blähmatten 4.A fixation of the catalyst body 5, 6 in the Housing parts 9, 10 takes place only in operation by the under Influence of swelling mats on the exhaust gases that swell 4.

Anschließend wird das zweite Gehäuseteil 10 in das erste Gehäuseteil 9 eingeschoben, bis es an dem ersten Katalysatorkörper 5 bzw. dem an diesem vorgesehenen Ringelement 9 anliegt, wobei die den Übergang zu dem aufgeweiteten Endbereich 11 bildende flache Ringstufe des ersten Gehäuseteils 9 den Einschiebevorgang abbremst, so daß das Distanzelement 7 nicht fest gegen den ersten Katalysatorkörper 5 stoßen kann und diesen beschädigt.Then the second housing part 10 is in the first housing part 9 inserted until it is on the first catalyst body 5 or the ring element 9 provided thereon, being the transition to the flared end area 11 forming flat ring step of the first housing part 9 brakes the insertion process so that the spacer 7th cannot hit hard against the first catalyst body 5 and damaged it.

Anschließend wird der Auslaßtrichter 3 auf das zweite Gehäuseteil 10 aufgeschoben, bis das Innenteil 3'' des Auslaßtrichters 3 in Anlage an dem Katalysatorkörper 6 kommt, und dann mit dem Gehäuseteil 10 verschweißt.Then the outlet funnel 3 on the second housing part 10 pushed on until the inner part 3 '' of the outlet funnel 3 comes into contact with the catalyst body 6, and then welded to the housing part 10.

Claims (7)

  1. Apparatus for the catalytic cleaning or decomposition of hot exhaust gases, in particular of a combustion engine, comprising a tube-like housing (1) which can be arranged or mounted in the exhaust gas flow and at least two catalyst bodies (5, 6) arranged axially following one another in the housing (1) and spaced apart from one another by a spacer element (7), the housing (1) having a first housing part (9) for the reception of the first catalyst body (5) and a second housing part (10) for the reception of the second catalyst body (6) and wherein the end regions of the housing parts (9, 10) engage over one another in a form-fitted manner at their mutually confronting ends and wherein a part of the inwardly disposed end region is formed as the spacer element (7) spacing the catalyst bodies (5, 6) apart.
  2. Apparatus in accordance with claim 1, characterized in that the spacer element (7) together with the inner wall of the outwardly disposed end region of the housing part (9) form a substantially closed Ring space.
  3. Apparatus in accordance with claim 2, characterized in that the ring space (12) is filled with a heat insulating material.
  4. Apparatus in accordance with one of the claims 1 to 3, characterized in that the outwardly disposed end region (11) of the housing part (9) is broadened out.
  5. Apparatus in accordance with claim 4, characterized in that the ring step like transition region of the end region of the housing part (9) has a small inclination relative to the axial direction of the housing (1) towards the end region.
  6. Apparatus in accordance with one of the claims 1 to 5, characterized in that the housing parts (9, 10) are tube parts or drawn parts, in particular with a non-round cross-section.
  7. Apparatus in accordance with one of the claims 1 to 6, characterized in that the end regions of the housing parts (9, 10) are welded to one another.
EP96108231A 1995-08-07 1996-05-23 Device for catalytically purifying resp. decomposing hot exhaust gases Expired - Lifetime EP0758048B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19528947 1995-08-07
DE19528947A DE19528947A1 (en) 1995-08-07 1995-08-07 Device for the catalytic cleaning or decomposition of hot exhaust gases

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EP0758048A1 EP0758048A1 (en) 1997-02-12
EP0758048B1 true EP0758048B1 (en) 1999-04-28

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AT (1) ATE179490T1 (en)
DE (2) DE19528947A1 (en)
ES (1) ES2130716T3 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10018805A1 (en) * 2000-04-15 2001-11-29 Volkswagen Ag Method and device for producing a catalyst with a monolith having a polygonal cross section
DE10133960A1 (en) * 2001-07-18 2003-03-06 Eberspaecher J Gmbh & Co Connection of a pipe to an exhaust gas housing part of a motor vehicle
DE10217925B4 (en) * 2002-04-22 2005-07-28 J. Eberspächer GmbH & Co. KG Catalyst for an internal combustion engine
DE10358504B4 (en) * 2003-12-13 2006-02-23 Daimlerchrysler Ag Process for the preparation of a catalyst housing
FR2879240B1 (en) * 2004-12-10 2010-12-17 Faurecia Sys Echappement DEVICE FOR DEPOLLUTING THE EXHAUST GAS OF A THERMAL ENGINE
FR2925578B1 (en) * 2007-12-21 2011-05-13 Faurecia Sys Echappement EXHAUST GAS DEPOLLUTION DEVICE OF A MOTOR VEHICLE WITH A THERMAL MOTOR
JP5079630B2 (en) 2008-08-08 2012-11-21 株式会社小松製作所 Exhaust gas purification device
DE102010015273A1 (en) * 2010-04-15 2011-10-20 J. Eberspächer GmbH & Co. KG Exhaust gas treatment device
FR3036733B1 (en) * 2015-05-28 2018-10-12 Renault S.A.S. COMPACT DEPOLLUTION SYSTEM OF A VEHICLE

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263893A1 (en) * 1986-10-16 1988-04-20 W.R. Grace & Co. Housing for catalytic converter elements and catalytic converter
DE8811086U1 (en) * 1988-09-01 1988-10-20 Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co Kg, 7000 Stuttgart, De
DE8812762U1 (en) * 1988-10-11 1989-06-29 Emitec Emissionstechnologie
DE4024015A1 (en) * 1990-07-28 1992-02-06 Boysen Friedrich Gmbh Co Kg DEVICE FOR CATALYTIC CLEANING OR DISASSEMBLY OF HOT EXHAUST GAS
DE4425995C2 (en) * 1994-07-22 1996-10-24 Boysen Friedrich Gmbh Co Kg Device for the catalytic cleaning or decomposition of hot exhaust gases

Also Published As

Publication number Publication date
EP0758048A1 (en) 1997-02-12
DE19528947A1 (en) 1997-02-13
ATE179490T1 (en) 1999-05-15
DE59601755D1 (en) 1999-06-02
ES2130716T3 (en) 1999-07-01

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