EP0758048A1 - Device for catalytically purifying resp. decomposing hot exhaust gases - Google Patents
Device for catalytically purifying resp. decomposing hot exhaust gases Download PDFInfo
- Publication number
- EP0758048A1 EP0758048A1 EP96108231A EP96108231A EP0758048A1 EP 0758048 A1 EP0758048 A1 EP 0758048A1 EP 96108231 A EP96108231 A EP 96108231A EP 96108231 A EP96108231 A EP 96108231A EP 0758048 A1 EP0758048 A1 EP 0758048A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- housing part
- parts
- spacer element
- 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.)
- Granted
Links
- 239000007789 gas Substances 0.000 title claims description 23
- 239000011810 insulating material Substances 0.000 claims abstract description 5
- 239000003054 catalyst Substances 0.000 claims description 39
- 125000006850 spacer group Chemical group 0.000 claims description 28
- 230000003197 catalytic effect Effects 0.000 claims description 9
- 238000000354 decomposition reaction Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 5
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 101100495270 Caenorhabditis elegans cdc-26 gene Proteins 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2853—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 the catalytic purification or decomposition of hot exhaust gases, in particular an internal combustion engine, with a tubular housing arranged or attachable in the exhaust gas flow and at least two catalyst bodies arranged axially one after the other in the housing and spaced apart by a spacer element.
- Such devices are known for example from DE-A-40 24 015 and are used in practice in particular for cleaning the exhaust gases from motor vehicles.
- the catalyst bodies which are encased on their outer circumference with a flexible covering such as an inflatable mat, and the spacer ring are inserted axially into the housing, a stamp-like tool serving as a stop at one end of the housing and the ones to be inserted into the housing Parts are pushed in and out one after the other from the other end of the housing by means of a further stamp.
- a ceramic ring is used as the spacer element, which can be encased on its outer circumference by an expansion mat and is supported radially on the inner wall of the housing.
- the end face of the ceramic ring lies tightly against the mutually facing end faces of the catalyst bodies, so that the expansion mats encasing the core ring and the catalyst bodies are shielded from the pulsations of the exhaust gases.
- thermal insulation of the housing from the hot exhaust gases is achieved in this known arrangement, because the ceramic ring, in particular with it encasing inflatable mat offers a relatively good thermal shielding.
- the arrangement of the ceramic ring or its production is comparatively expensive. This applies in particular if the housing is to have a cross-section deviating from the circular shape, for example an elliptical shape or the like.
- the object of the invention is to provide a device for the catalytic cleaning or decomposition of hot exhaust gases of the type mentioned at the outset, which is of simple construction and in particular has a small number of individual components in the interior of the housing through which the exhaust gas flows.
- the device should advantageously be designed so that it enables good thermal insulation in the region of the spacer element.
- the housing has a first housing part for receiving the first catalyst body and a second housing part for receiving the second catalyst body and that the housing parts engage in a form-fitting manner on their mutually facing end faces and the end of the inner housing part as that Spacer element spacing the catalyst body is formed.
- the inventive design of the spacer ring on the housing allows the number of individual components which are present in the space of the housing through which the hot exhaust gas flows, and thus simplify the construction of the device for catalytic cleaning.
- the device according to the invention is installed in a simple manner by pushing the first catalyst body into the first housing part, then pushing the second housing part into the first housing part until the spacer element comes into contact with the first catalyst body and finally the second catalyst body into the second Housing part is inserted.
- the housing is divided into two axially successive housing parts and each housing part receives a catalyst body, the way that the catalyst body must be inserted into the housing when assembling the device and thus the time required for the insertion process is low.
- the spacer element can be integrally formed on the housing part by an additional shaping process in the manufacture of the corresponding housing part.
- the housing and the spacer element are preferably designed in such a way that the spacer element can be molded onto the housing part during the operation in which the housing part is given its essentially freely selectable outer shape.
- the molding of the spacer on a housing part does not require much effort and is inexpensive compared to the use of a ceramic ring.
- the formation of the spacer on a sheet metal housing part has the further advantage that Spacer element can be made relatively elastic compared to spacer elements made of ceramic material, so that the spacer ring can easily nestle against the facing end faces of the catalyst body and also the different thermal expansions of the housing and the catalyst body can be compensated.
- the spacer element is designed such that it forms a substantially closed annular space with the inner wall of the outer housing part, so that an air gap is formed between the flow space for the exhaust gas and the housing.
- good thermal insulation of the housing can be achieved, especially since insulating material can also be arranged in the closed annular space.
- the outer housing part is widened in its end region positively overlapping the inner housing part and the annular step of the outer housing part forming the transition to the widened end region is flat, i.e. formed with a slight inclination to the axial direction of the housing. This ensures that the insertion process of the inner housing part into the outer housing part in the area of the ring step is braked by bending the widened end region and thus the spacer element does not abut and damage the first catalyst body inserted into the outer housing part.
- the device shown for the catalytic cleaning or decomposition of exhaust gases from an internal combustion engine has a housing 1 with a non-circular cross-section, which is connected at the end to an inlet funnel 2 and an outlet funnel 3, the inlet funnel 2 being connected to an engine, the inlet funnel 2 having a Exhaust line on the engine side and the outlet funnel 3 can be connected to an exhaust line leading to the atmosphere.
- two catalyst bodies 5, 6, each encased by an inflatable mat 4 are arranged axially one after the other, which are spaced apart by a spacer 7, so that a space 8 is created between the catalyst bodies 5, 6, in which the by Inlet funnel 2 entering and passing through the first catalyst body 5 exhaust gases can mix before entering 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 on their facing one another The end faces are interlocking and are welded together.
- the first housing part 9 has an end region 11 which is widened to such an extent that the second housing part 10 can be pushed into the first housing part 9 in a positive manner.
- the end of the second housing part 10 which engages in the first housing part 9 is designed as the spacer element 7 spacing the catalyst bodies 5, 6 and bears against the end faces of the catalyst bodies 5, 6.
- the spacer element 7 is designed as an annular element and molded onto the second housing part 10 and forms with the inner wall of the first housing part 9 an air-filled annular space 12 between the area through which the hot exhaust gases flow and the housing wall, as a result of which there is good thermal insulation of the housing 1 the hot exhaust gases is guaranteed.
- the annular space 12 can additionally be filled with a heat-insulating material in order to increase the insulation effect.
- the inner diameter of the spacer element 7 is only slightly smaller than the outer diameter of the catalyst bodies 5, 6, so that their facing end faces are only slightly overlapped by the spacer element 7 and the entire cross section of the catalyst bodies 5, 6 is largely available for the exhaust gases flowing through.
- the inlet and outlet funnels 2, 3 are each double-walled with outer parts 2 ', 3' and inner parts 2 '', 3 '', between which an air gap is free for thermal insulation remains, which may be filled with a heat insulating material.
- the outer part 2 'of the inlet funnel 2 is welded to the outer surface of the first housing part 9, and the inner part 2' 'is plugged onto the inlet-side end 14 of the housing part 9, which has a reduced diameter and forms a sliding seat with it.
- the outlet funnel 3 is fastened to the second housing part 10. Since the second housing part 10 has no reduced diameter at its end on the outlet funnel side, the outer part 3 'of the outlet funnel 3 is shaped such that it overlaps the inner part 3' 'which forms a sliding seat with the second housing part 10.
- ring elements 13 made of knitted steel wire. These ring elements 13 also protect the edges of the catalyst bodies 5, 6 against damage.
- the device according to the invention for the catalytic cleaning or decomposition of hot exhaust gases is assembled as follows:
- the two catalyst bodies 5, 6 are pushed axially into the first housing part 9 with the associated expansion mats 4 with stamp-like tools, the shoulder 15 leading to the end 14 of reduced diameter of the first housing part 9 and the spacer 7 provided on the end face of the second housing part 10 as stops.
- the inflatable mats 4 should be shielded from pulsations of the exhaust gases, since these pulsations would destroy the inflatable mats 4 in the long term. For this reason, the catalyst bodies 5, 6 and the second housing part 10 are pushed against one another with sufficient axial pressure, in such a way that the spacer element 7 lies sealingly against the mutually facing end faces of the catalyst bodies 5, 6.
- the catalyst bodies 5, 6 are only fixed in the housing parts 9, 10 during operation by the expansion mats 4 swelling under the action of heat from the exhaust gases.
- the second housing part 10 is pushed into the first housing part 9 until it abuts the first catalyst body 5 or the ring element 9 provided thereon, the flat ring step of the first housing part 9 forming the transition to the widened end region 11 slowing down the insertion process, so that the spacer 7 can not abut the first catalyst body 5 and damage it.
- the outlet funnel 3 is then pushed onto the second housing part 10 until the inner part 3 ′′ of the outlet funnel 3 comes into contact with the catalyst body 6, and is then welded to the housing part 10.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Catalysts (AREA)
- Incineration Of Waste (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur katalytischen Reinigung bzw. Zerlegung von heißen Abgasen insbesondere eines Verbrennungsmotors, mit einem im Abgasstrom angeordneten bzw. anbringbaren rohrartigen Gehäuse und wenigstens zwei in dem Gehäuse axial aufeinanderfolgend angeordneten und durch ein Distanzelement voneinander beabstandeten Katalysatorkörpern.The invention relates to a device for the catalytic purification or decomposition of hot exhaust gases, in particular an internal combustion engine, with a tubular housing arranged or attachable in the exhaust gas flow and at least two catalyst bodies arranged axially one after the other in the housing and spaced apart by a spacer element.
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 known for example from DE-A-40 24 015 and are used in practice in particular for cleaning the exhaust gases from motor vehicles. In the manufacture of these devices, the catalyst bodies, which are encased on their outer circumference with a flexible covering such as an inflatable mat, and the spacer ring are inserted axially into the housing, a stamp-like tool serving as a stop at one end of the housing and the ones to be inserted into the housing Parts are pushed in and out one after the other from the other end of the housing by means of a further stamp.
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 the spacer element, which can be encased on its outer circumference by an expansion mat and is supported radially on the inner wall of the housing. The end face of the ceramic ring lies tightly against the mutually facing end faces of the catalyst bodies, so that the expansion mats encasing the core ring and the catalyst bodies are shielded from the pulsations of the exhaust gases. In addition, thermal insulation of the housing from the hot exhaust gases is achieved in this known arrangement, because the ceramic ring, in particular with it encasing inflatable mat offers a relatively good thermal shielding.
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 applies in particular if the housing is to have a cross-section deviating from the circular shape, for example an elliptical shape or the like.
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 felt to be disadvantageous that the number of individual parts arranged in the housing is high in the known device for the catalytic cleaning or decomposition of hot exhaust gases.
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 to provide a device for the catalytic cleaning or decomposition of hot exhaust gases of the type mentioned at the outset, which is of simple construction and in particular has a small number of individual components in the interior of the housing through which the exhaust gas flows. The device should advantageously be designed so that it enables good thermal insulation in the region of the spacer element.
Diese Aufgabe wird erfindungsgemäß im wesentlichen dadurch gelöst, daß das Gehäuse ein erstes Gehäuseteil zur Aufnahme des ersten Katalysatorkörpers und ein zweites Gehäuseteil zur Aufnahme des zweiten Katalysatorkörpers aufweist und daß die Gehäuseteile an ihren einander zugewandten Stirnseiten formschlüssig ineinander greifen und das Ende des innenliegenden Gehäuseteils als die Katalysatorkörper beabstandendes Distanzelement ausgebildet ist.This object is achieved essentially in that the housing has a first housing part for receiving the first catalyst body and a second housing part for receiving the second catalyst body and that the housing parts engage in a form-fitting manner on their mutually facing end faces and the end of the inner housing part as that Spacer element spacing the catalyst body is formed.
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.The inventive design of the spacer ring on the housing allows the number of individual components which are present in the space of the housing through which the hot exhaust gas flows, and thus simplify the construction of 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 das erste Gehäuseteil 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 installed in a simple manner by pushing the first catalyst body into the first housing part, then pushing the second housing part into the first housing part until the spacer element comes into contact with the first catalyst body and finally the second catalyst body into the 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.Characterized in that the housing is divided into two axially successive housing parts and each housing part receives a catalyst body, the way that the catalyst body must be inserted into the housing when assembling the device and thus the time required for the insertion process is low.
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 integrally formed on the housing part by an additional shaping process in the manufacture of the corresponding housing part. However, the housing and the spacer element are preferably designed in such a way that the spacer element can be molded onto the housing part during the operation in which the housing part is given its essentially freely selectable outer shape.
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 molding of the spacer on a housing part does not require much effort and is inexpensive compared to the use of 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 formation of the spacer on a sheet metal housing part has the further advantage that Spacer element can be made relatively elastic compared to spacer elements made of ceramic material, so that the spacer ring can easily nestle against the facing end faces of the catalyst body and also the different thermal expansions 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.Advantageously, the spacer element is designed such that it forms a substantially closed annular space with the inner wall of the outer housing part, so that an air gap is formed between the flow space for the exhaust gas and the housing. As a result, good thermal insulation of the housing can be achieved, especially since insulating material can also be arranged in the closed annular space.
Vorzugsweise ist das außenliegende Gehäuseteil in seinem das innenliegende Gehäuseteil formschlüssig übergreifenden Endbereich 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.Preferably, the outer housing part is widened in its end region positively overlapping the inner housing part and the annular step of the outer housing part forming the transition to the widened end region is flat, i.e. formed with a slight inclination to the axial direction of the housing. This ensures that the insertion process of the inner housing part into the outer housing part in the area of the ring step is braked by bending the widened end region and thus the spacer element does not abut and damage the first catalyst body inserted into the outer housing part.
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.
- Figure 1
- a schematic axial section of a device according to the invention for the 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 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 the catalytic cleaning or decomposition of exhaust gases from an internal combustion engine has a
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-
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
Zur Herstellung der formschlüssigen Verbindung weist das erste Gehäuseteil 9 einen Endbereich 11 auf, der so weit aufgeweitet ist, daß das zweite Gehäuseteil 10 formschlüssig in das erste Gehäuseteil 9 eingeschoben werden kann.To produce the positive connection, the
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
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 element 7 is designed as an annular element and molded onto the
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 element 7 is only slightly smaller than the outer diameter of the
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
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
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
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.On the end faces of the
Die erfindungsgemäße Vorrichtung zur katalytischen Reinigung bzw. Zerlegung von heißen Abgasen wird wie folgt zusammengebaut:The device according to the invention for the catalytic cleaning or decomposition 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 diesen.The two
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
Eine Fixierung der Katalysatorkörper 5, 6 in den Gehäuseteilen 9, 10 erfolgt erst im Betrieb durch die unter Hitzeeinwirkung der Abgase aufquellenden Blähmatten 4.The
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 Ubergang 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.Subsequently, the
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.The
Claims (7)
dadurch gekennzeichnet,
daß das Gehäuse (1) ein erstes Gehäuseteil (9) zur Aufnahme des ersten Katalysatorkörpers (5) und ein zweites Gehäuseteil (10) zur Aufnahme des zweiten Katalysatorkörpers (6) aufweist und daß die Gehäuseteile (9, 10) an ihren einander zugewandeten Stirnseiten formschlüssig ineinander greifen und das Ende des innenliegenden Gehäuseteils (10) als die Katalysatorkörper (5, 6) beabstandendes Distanzelement (7) ausgebildet ist.Device for the catalytic purification or decomposition of hot exhaust gases, in particular of an internal combustion engine, with a tubular housing (1) which is arranged or attachable in the exhaust gas flow and at least two catalyst bodies arranged axially in succession in the housing (1) and spaced apart by a spacer element (7) ( 5, 6),
characterized by
that the housing (1) has a first housing part (9) for receiving the first catalyst body (5) and a second housing part (10) for receiving the second catalyst body (6) and that the housing parts (9, 10) on their mutually facing end faces interlock positively and the end of the inner housing part (10) is designed as a spacer element (7) spacing the catalyst bodies (5, 6).
dadurch gekennzeichnet,
daß das Distanzelement (7) mit der Innenwand des außenliegenden Gehäuseteils (9) einen im wesentlichen geschlossenen Ringraum (12) bildet.Device according to claim 1,
characterized by
that the spacer element (7) forms an essentially closed annular space (12) with the inner wall of the outer housing part (9).
dadurch gekennzeichnet,
daß der Ringraum (12) mit einem wärmedämmenden Material gefüllt ist.Device according to claim 2,
characterized by
that the annular space (12) is filled with a heat-insulating material.
dadurch gekennzeichnet,
daß das außenliegende Gehäuseteil (9) an seinem das innenliegende Gehäuseteil (10) formschlüssig übergreifenden Endbereich (11) aufgeweitet ist.Device according to one of claims 1 to 3,
characterized by
that the outer housing part (9) is widened at its end region (11) which positively engages over the inner housing part (10).
dadurch gekennzeichnet,
daß der ringstufenförmige Übergangsbereich des außenliegenden Gehäuseteils (9) zu dem aufgeweiteten Endbereich (11) eine geringe Neigung gegenüber der Axialrichtung (A) des Gehäuses (1) aufweist.Device according to claim 4,
characterized by
that the annular step-shaped transition region of the outer housing part (9) to the widened end region (11) has a slight inclination with respect to the axial direction (A) of the housing (1).
dadurch gekennzeichnet,
daß die Gehäuseteile (9, 10) Rohrteile oder Ziehteile mit insbesondere unrundem Querschnitt sind.Device according to one of claims 1 to 5,
characterized by
that the housing parts (9, 10) are tubular parts or drawn parts with a particularly non-circular cross-section.
dadurch gekennzeichnet,
daß die Gehäuseteile (9, 10) miteinander verschweißt sind.Device according to one of claims 1 to 6,
characterized by
that the housing parts (9, 10) are welded together.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19528947A DE19528947A1 (en) | 1995-08-07 | 1995-08-07 | Device for the catalytic cleaning or decomposition of hot exhaust gases |
| DE19528947 | 1995-08-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0758048A1 true EP0758048A1 (en) | 1997-02-12 |
| EP0758048B1 EP0758048B1 (en) | 1999-04-28 |
Family
ID=7768870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96108231A Expired - Lifetime EP0758048B1 (en) | 1995-08-07 | 1996-05-23 | Device for catalytically purifying resp. decomposing hot exhaust gases |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0758048B1 (en) |
| AT (1) | ATE179490T1 (en) |
| DE (2) | DE19528947A1 (en) |
| ES (1) | ES2130716T3 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001079668A1 (en) * | 2000-04-15 | 2001-10-25 | Volkswagen Aktiengesellschaft | Device and method for producing a catalyst with a monolith having a polygonal cross-section |
| EP1361347A1 (en) * | 2002-04-22 | 2003-11-12 | J. Eberspächer GmbH & Co. KG | Catalytic Converter for an Internal Combustion Engine |
| WO2006061526A1 (en) * | 2004-12-10 | 2006-06-15 | Faurecia Systemes D'echappement | Device for depolluting a heat engine exhaust gases |
| FR2925578A1 (en) * | 2007-12-21 | 2009-06-26 | Faurecia Sys Echappement | Exhaust gas depolluting device for heat engine of motor vehicle, has purification unit housed in cylindrical part of longitudinal section of external envelope, where cylindrical and tapered parts of section are formed as single piece |
| US20110256032A1 (en) * | 2010-04-15 | 2011-10-20 | J. Eberspaecher Gmbh & Co. Kg | Exhaust Gas Treatment Device |
| US8535611B2 (en) | 2008-08-08 | 2013-09-17 | Komatsu Ltd. | Exhaust gas purifying device |
| EP3098410A1 (en) * | 2015-05-28 | 2016-11-30 | Renault S.A.S. | Compact pollution-control system of a vehicle |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| DE10358504B4 (en) * | 2003-12-13 | 2006-02-23 | Daimlerchrysler Ag | Process for the preparation of a catalyst housing |
Citations (5)
| 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 | Emitec Gesellschaft für Emissionstechnologie mbH, 53797 Lohmar | Carrier body for a catalytic reactor for exhaust gas purification |
| DE8812762U1 (en) * | 1988-10-11 | 1989-06-29 | Emitec Gesellschaft für Emissionstechnologie mbH, 5204 Lohmar | Catalyst with double jacket system |
| DE4024015A1 (en) * | 1990-07-28 | 1992-02-06 | Boysen Friedrich Gmbh Co Kg | DEVICE FOR CATALYTIC CLEANING OR DISASSEMBLY OF HOT EXHAUST GAS |
| EP0693616A1 (en) * | 1994-07-22 | 1996-01-24 | Friedrich Boysen GmbH & Co. KG | Device for catalytic purification or decomposition of hot exhaust gases |
-
1995
- 1995-08-07 DE DE19528947A patent/DE19528947A1/en not_active Withdrawn
-
1996
- 1996-05-23 ES ES96108231T patent/ES2130716T3/en not_active Expired - Lifetime
- 1996-05-23 EP EP96108231A patent/EP0758048B1/en not_active Expired - Lifetime
- 1996-05-23 DE DE59601755T patent/DE59601755D1/en not_active Expired - Lifetime
- 1996-05-23 AT AT96108231T patent/ATE179490T1/en not_active IP Right Cessation
Patent Citations (5)
| 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 | Emitec Gesellschaft für Emissionstechnologie mbH, 53797 Lohmar | Carrier body for a catalytic reactor for exhaust gas purification |
| DE8812762U1 (en) * | 1988-10-11 | 1989-06-29 | Emitec Gesellschaft für Emissionstechnologie mbH, 5204 Lohmar | Catalyst with double jacket system |
| DE4024015A1 (en) * | 1990-07-28 | 1992-02-06 | Boysen Friedrich Gmbh Co Kg | DEVICE FOR CATALYTIC CLEANING OR DISASSEMBLY OF HOT EXHAUST GAS |
| EP0693616A1 (en) * | 1994-07-22 | 1996-01-24 | Friedrich Boysen GmbH & Co. KG | Device for catalytic purification or decomposition of hot exhaust gases |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001079668A1 (en) * | 2000-04-15 | 2001-10-25 | Volkswagen Aktiengesellschaft | Device and method for producing a catalyst with a monolith having a polygonal cross-section |
| EP1361347A1 (en) * | 2002-04-22 | 2003-11-12 | J. Eberspächer GmbH & Co. KG | Catalytic Converter for an Internal Combustion Engine |
| US7384613B2 (en) | 2002-04-22 | 2008-06-10 | J. Eberspacher Gmbh & Co. Kg | Catalyst for an internal combustion engine |
| WO2006061526A1 (en) * | 2004-12-10 | 2006-06-15 | Faurecia Systemes D'echappement | Device for depolluting a heat engine exhaust gases |
| FR2879240A1 (en) * | 2004-12-10 | 2006-06-16 | Faurecia Sys Echappement | DEVICE FOR DEPOLLUTING THE EXHAUST GAS OF A THERMAL ENGINE |
| FR2925578A1 (en) * | 2007-12-21 | 2009-06-26 | Faurecia Sys Echappement | Exhaust gas depolluting device for heat engine of motor vehicle, has purification unit housed in cylindrical part of longitudinal section of external envelope, where cylindrical and tapered parts of section are formed as single piece |
| US8535611B2 (en) | 2008-08-08 | 2013-09-17 | Komatsu Ltd. | Exhaust gas purifying device |
| US20110256032A1 (en) * | 2010-04-15 | 2011-10-20 | J. Eberspaecher Gmbh & Co. Kg | Exhaust Gas Treatment Device |
| EP3098410A1 (en) * | 2015-05-28 | 2016-11-30 | Renault S.A.S. | Compact pollution-control system of a vehicle |
| FR3036733A1 (en) * | 2015-05-28 | 2016-12-02 | Renault Sa | COMPACT DEPOLLUTION SYSTEM OF A VEHICLE |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59601755D1 (en) | 1999-06-02 |
| EP0758048B1 (en) | 1999-04-28 |
| ATE179490T1 (en) | 1999-05-15 |
| DE19528947A1 (en) | 1997-02-13 |
| ES2130716T3 (en) | 1999-07-01 |
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