EP0193072B1 - Dispositif d'épuration catalytique des gaz d'échappement - Google Patents

Dispositif d'épuration catalytique des gaz d'échappement Download PDF

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Publication number
EP0193072B1
EP0193072B1 EP86102020A EP86102020A EP0193072B1 EP 0193072 B1 EP0193072 B1 EP 0193072B1 EP 86102020 A EP86102020 A EP 86102020A EP 86102020 A EP86102020 A EP 86102020A EP 0193072 B1 EP0193072 B1 EP 0193072B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
ceramic body
catalytically
toxifying
outer housing
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
Application number
EP86102020A
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German (de)
English (en)
Other versions
EP0193072A1 (fr
Inventor
Alfons Zachmann
Günter Strüber
Walter Dr. Stoepler
Jürgen Brich
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.)
Leistritz AG
Original Assignee
Leistritz AG
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
Priority claimed from DE19853506219 external-priority patent/DE3506219A1/de
Priority claimed from DE19853509790 external-priority patent/DE3509790A1/de
Application filed by Leistritz AG filed Critical Leistritz AG
Publication of EP0193072A1 publication Critical patent/EP0193072A1/fr
Application granted granted Critical
Publication of EP0193072B1 publication Critical patent/EP0193072B1/fr
Expired legal-status Critical Current

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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
    • 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
    • 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
    • F01N2350/00—Arrangements for fitting catalyst support or particle filter element in the housing
    • F01N2350/02—Fitting ceramic monoliths in a metallic 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
    • F01N2350/00—Arrangements for fitting catalyst support or particle filter element in the housing
    • F01N2350/02—Fitting ceramic monoliths in a metallic housing
    • F01N2350/06—Fitting ceramic monoliths in a metallic housing with means preventing gas flow by-pass or leakage

Definitions

  • the invention relates to a catalytic exhaust gas detoxification device with at least one honeycomb-like structured monolithic ceramic body with a catalytically active surface coating arranged in a metallic outer housing consisting of two shells with front exhaust gas inlet and outlet connections, with a spring mat interposed between the outer housing and the ceramic body and the areas of the outer housing in front of and behind the ceramic bodies are covered by shields.
  • the housing must be made of a very temperature-resistant material, and in practice the high temperature resistance of the steel sheets that can be used for this purpose can only be achieved with materials that have particularly high thermal expansion coefficients. Fulfilling one of the necessary requirements for the metal housing means that another essential property is not present.
  • the invention is therefore based on the object of designing a catalytic exhaust gas detoxification device of the type mentioned in such a way that safe storage of the ceramic body is always guaranteed, even taking into account the large expansion differences, and that the entire device can be formed with the lowest possible molding costs and with simple construction and simple assembly can be made.
  • the shells of the outer housing including the exhaust gas inlet and outlet connections are integral components and that a housing-like holding device which is made of temperature-resistant metal and is optionally provided with recesses or interruptions in the jacket region of the ceramic body is arranged in the supporting outer housing , which runs at least outside the bearing sections for the ceramic body at a distance from the outer housing and (to compensate for different thermal expansions) is held axially freely displaceable at least at one end.
  • an inner housing enables the construction of a converter, in which the risk of blow-out of the spring mats is completely avoided, in particular if it runs at a distance from the outer housing over the entire length of the housing and is therefore pressed tightly against the outer jacket of the ceramic body is because the gap outside the ceramic body, in which these spring mats are arranged, cannot be reached by the exhaust gas flow at all.
  • This blowout prevention is not the sole and the main goal of the continuous inner housing according to the invention.
  • This inner housing enables a structure in which the outer housing consists of a cheaper, less temperature-resistant, yet load-bearing metal sheet which, as has already been mentioned at the beginning, has a considerably smaller coefficient of thermal expansion. This reduces the problems of an absolutely wobble-free fit of the ceramic bodies.
  • the lack or lower temperature resistance of the outer sheet is made possible by the fact that it is shielded very strongly from the high temperature values by the inner casing, and this applies both when an air jacket between the inner and outer casing, as well as in cases where everywhere, in particular, an insulating mat, primarily based on aluminum-silicate fiber or a so-called swelling mat, is also arranged in the inlet and outlet ports.
  • an insulating mat primarily based on aluminum-silicate fiber or a so-called swelling mat
  • Another major advantage of the arrangement according to the invention is the cost-effective production, since the one-piece production of the housing shells is considerably easier both in terms of tool costs and the assembly costs than if the housing is constructed from a plurality of cylindrical intermediate pieces and connecting cone sections to be fastened thereon.
  • the inner housing is constructed in such a way that the inner housing runs continuously at a distance from the outer housing, it has proven to be particularly expedient if the inner housing is provided with recesses spaced from the end faces of the ceramic body, through which the spring mat supported on the outer housing is in direct contact with the outer surface of the ceramic body is.
  • the ring sections of the inner housing comprising the ends of the ceramic bodies are provided with axial slots which form resilient contact tongues and which end from the end faces.
  • both the ceramic body and the inner and outer housing in each case Spring tongues are pressed firmly against the outer jacket of the ceramic body, thus ensuring an absolutely wobble-free fit.
  • a sliding fit of the end of the inner housing to the outer housing should be provided at the end of the inlet and / or outlet funnel.
  • the inlet and / or outlet funnel of the outer housing can both be welded to a connecting flange in order to be able to easily insert such a converter into an exhaust system by screwing it to the counter flange of the other pipelines.
  • a pre-pipe which prevents the risk of scaling should be provided in order to rule out the risk that scale particles settle in front of the input surface of the ceramic body and thus block its continuous channels.
  • the sliding seat can be formed by tapering the front end of this front tube, which with its subsequent enlarged section fits snugly into the end of the outer housing and, if necessary, can also be additionally welded there.
  • the exhaust gases are the spring mats used for storage, with so-called swelling mats being used with particular preference, i.e. Mineral fiber-based mats, which inflate strongly when the temperature rises, cannot reach them, so that the danger of blowing out these mineral fiber mats is completely avoided.
  • swelling mats i.e. Mineral fiber-based mats, which inflate strongly when the temperature rises, cannot reach them, so that the danger of blowing out these mineral fiber mats is completely avoided.
  • this encirclement of the ceramic body there is always a certain stress load and ultimately a certain risk of breakage due to the inner housing.
  • the inner housing only covers the inner surfaces of the exhaust gas inlet and outlet connections and, if necessary, the space between the outer housing between two ceramic bodies lying one behind the other and that the conical or cylindrical shielding plate at least in the area of the gas entry face of a ceramic body includes this at a distance without contact and the gap to the ceramic body is covered by a thin, flexible temperature-resistant film, in particular a metal film, which is pressed by the elastic mounting on the shielding plate and the ceramic body.
  • a simplification of the housing structure in particular in the sense that relatively cheap steel sheets can be used for the actual housing, which are not so temperature-resistant for this purpose, has already been proposed in an earlier application that for shielding in the surface areas of the outer housing not covered by the ceramic body at a distance from these extending shielding plates are provided.
  • the shielding plates do not have to have a supporting function, so that they can consist of relatively thin plates, which can then consist of high-temperature-resistant, expensive materials without too great cost disadvantages and with the advantage of being easy to process. In this case too, however, difficulties still arise either with the blow-out protection of the spring cushion bearing or with the complete use of space in the inner volume of the ceramic body for exhaust gas purification.
  • the invention is therefore based on the object of designing an exhaust gas purification device of the type described in such a way that, with a simple structure and without impairment and narrowing of the inlet end face of the ceramic body, a bearing which is safe and solid and excludes any risk of breakage, even taking into account the large differences in thermal expansion of the components involved of the ceramic body is ensured, so that in particular blowing out of the spring cushion by the pulsating exhaust gases is reliably prevented.
  • the conical or cylindrical shielding plate at least in the area of the gas inlet end face of a ceramic body surrounds it at a distance, and the gap to the ceramic body is covered by a thin, flexible, temperature-resistant film, in particular a metal film, which is covered by the elastic mounting is pressed against the shielding plate and the ceramic body.
  • the optimal sealing of the bearing gap against the exhaust gas flows is achieved in that, as it were, a metal shielding wall is drawn directly to the outer surface of the ceramic body, but the design of the transition section as a flexible metal foil nevertheless ensures that thermal expansion differences do not differ can precipitate in the form of corresponding strong tension, which could lead to the ceramic body shattering.
  • the metal foil can be glued to the elastic mounting or the shielding plate, the gluing to the underside of the spring cushion being particularly advantageous.
  • Such an adhesive bond to the underside of the spring cushion as a result of which the film is simply pressed onto the edge section of the shielding plate, has the great advantage that precisely when such an exhaust gas cleaning device is started up for the first time, i.e. when heating up for the first time, the shielding plate can expand unhindered and thereby slide off on the film, which practically does not shift at the other end due to the pressure on the surface of the ceramic body.
  • the film is pushed together by a fraction of a millimeter, so that a kind of fold is formed, which in the later heating and cooling cycles can easily accommodate the thermal expansion differences regardless of the sliding of the shielding plate can catch on the film itself.
  • the spring cushion is preferably designed and inserted in such a way that strips are inserted into the half-shells of the housing, each covering half of the ceramic body on its circumference.
  • the film should preferably be overlapping in the area of the parting lines.
  • the film can be made of stainless steel with particular advantage, it having been found that film thicknesses of 0.01 to 0.1 mm, preferably approximately between 0.02 mm and 0.05 mm, are particularly favorable in this case.
  • the converter shown in Figure 1 that is, the core of an exhaust gas detoxification device according to the invention, comprising the catalytically coated ceramic body and the funnel-shaped inlet and outlet connections, comprises an outer housing 1 made of a metal sheet which has only a low coefficient of thermal expansion, even if it is not particularly temperature-resistant, and an inner housing 2 made of temperature-resistant, relatively thin sheet metal or metal foil.
  • Both housings each consist of two half-shells welded to one another or connected by nesting, which in turn have been manufactured continuously in a molding tool, so that assembly from individual funnel-shaped sections and connecting cylinder sections, as has hitherto usually been provided in such converters, is avoided.
  • the effort for the production of a correspondingly larger shape is considerably lower than in the case of such a customary single-part production, both in terms of the pure amount of shape, and in particular also in terms of assembly effort.
  • the inner housing 2 runs continuously over the entire length - with the exception of at most the end sections - at a distance from the outer housing 1.
  • the gap in between can be completely filled with an insulating mat, for example made of aluminum silicate fiber be.
  • an air gap is arranged between the two housings in the area of the inlet funnel 3 and the outlet funnel 4, which in most cases also ensures adequate thermal decoupling.
  • the outer housing On the input side, the outer housing is welded into a mounting flange 5, the inner housing supported by a sealing ring 6 having a sliding seat guaranteed by the retracted pipe section 7, so that the strong thermal expansion differences between the different materials of the inner and outer housing by unimpeded displacement of the Tail pipe section 8 of the inner housing in the surrounding pipe section 9 of the outer housing can be compensated.
  • the inner housing In the bearing section of the two honeycomb-structured monolithic ceramic bodies 10 and 11, the inner housing is provided with a recess 12 and 12 ', respectively, the recess 12 in the region of the first ceramic body 10 comprising two sections which, viewed in the circumferential direction, extend over an angle of less than 180 ° extend so that the inner housing is still continuously connected in the area of the side strips 14.
  • the recess is formed all round, so that the inner housing is interrupted at this point by a cylindrical section.
  • These cutouts 12 and 12 servee to ensure that the spring mat 13 supported on the outer housing is in direct contact with the outer surface of the ceramic bodies 10, 11 in the area of the cutouts 12 and 12'. So there is an immediate resilient mounting of the ceramic body in the outer housing.
  • the ring sections 15 and 15 'comprising the ceramic bodies 10 and 11, the latter being arranged at a distance from one another, are provided with axial slots 16 which form resilient contact tongues 17.
  • the slots 16 are of course kept in their dimensions so that they end in front of the respective ends 18, 19, 20 and 21 of the ceramic bodies 10, 11.
  • the resilient contact tongues 17 are pressed against the outer surface of the ceramic body 10, 11 by the spring mat 13 extending over them and thus absorb both the tolerance differences and the thermal expansion differences. This design results in a sealing of the gap between the two housings, so that the spring mat 13 cannot be blown out by exhaust gases.
  • the completely all-round design of the recess 12 ' that is to say the cutting out of an intermediate piece from the inner housing, has the advantage that the ring portions 15 'are arranged in a sliding seat on the ceramic body, so that the sliding seat does not have to be formed on the input side between the inner and outer housing, but instead - as shown in the area of the output connection flange 22 - the inside - And outer housing can also be welded to one another, since the thermal longitudinal expansion differences can be compensated for by the sliding fit of the ring sections 15 '.
  • the design of a converter shown in FIG. 1 with an inner housing 2, which is continuously at a distance from the outer housing, has the considerable advantage that the entire cross section of the ceramic bodies 10, 11 is available for exhaust gas detoxification, since the edges of the end faces 18 to 21 drawn additional sealing rings, which are intended to prevent the spring mat 13 from blowing out, are not required.
  • a scaling-free front pipe 23 is provided instead of a fastening flange 5, which is provided with retracted ring sections 24 and 25 in such a way that the ring section 24 press-fits into the end section 9 of the outer housing (possibly there can also be welded), while the spaced end portion 25 serves to form the sliding fit of the inner housing 2, ie the function of the pipe section 7 in Figure 1 takes over.
  • the shells of the inner housing 2 and the outer housing 1 including the inlet funnel 3 and the outlet funnel 4 are made as one-piece parts and that the inner housing 2 is preferably made of temperature-resistant material, while the Outer housing 1 is formed from a possibly less temperature-resistant material, which, however, has a lower coefficient of expansion, so that the surface pressure on the monolith does not decrease so much even with the strong temperature differences.
  • the particularly advantageous embodiment variant according to FIG. 1 has the advantage that the spring mat 13, which generally consists of individual strips placed axially against one another, can be applied to the fit of the strips much more easily and without problems. Because of the risk of the exhaust gases blowing through in the gap filled by the spring mat, it has hitherto been necessary for the individual spring mat strips to be connected to one another exactly and as gap-free as possible when folded over the ceramic body. For this purpose it is often even provided that an end recess is provided in one, in which a corresponding tongue of the opposite engages. Under no circumstances should these parts overlap. Due to the complete sealing of the gap between the inner housing according to the invention and an outer housing, as is achieved in FIG. 1, there is no need for such an additional sealing at all, so that the spring mat may also be placed around the ceramic body with the acceptance of an axial gap can, since such a gap of a few millimeters does not impair the storage of the ceramic body in the housing.
  • FIGS. 4 to 6 An embodiment is shown on the basis of FIGS. 4 to 6, in which the inner housing only covers the inner surfaces of the exhaust gas inlet and outlet connections, as well as the intermediate space of the outer housing between two ceramic bodies lying one behind the other.
  • Monolithic, honeycomb-like structured ceramic bodies 103 are held in the essentially cylindrical outer housing 101, which is followed by conically tapering exhaust gas inlet and outlet connections 102, the surface of which is optionally provided with a catalytically active surface coating.
  • So-called swelling mats 104 are provided for holding these ceramic bodies, i.e. Fireproof fiber mats, which expand with increasing temperature, ensure a centered mounting in the outer housing, also taking into account the greatly different expansion during operation of the exhaust gas purification device.
  • the inner surfaces of the exhaust gas supply and discharge ports 102 are covered with thermally insulating mats 105, which in turn are covered by a high-temperature-resistant shielding sheet 106 are covered.
  • a corresponding shielding plate 106a is provided in the transition area between the two ceramic bodies 103 lying one behind the other in order to isolate the outer housing from the hot exhaust gas flow in this area as well.
  • the shielding plates 106 are in welded its outer edge zone 114 to the outer housing 101 and a mounting flange 115, which is used to install the converter in the exhaust pipe.
  • the shielding plates 106 which form an essentially frustoconical structure, are provided with an outwardly concave ring section 116, which surrounds the start of the ceramic body 103 at a distance. The same applies correspondingly to the two ends 116a of the shielding plate 106a between the ceramic bodies 103.
  • metal foils 118 made of stainless steel with a thickness of between about 0.02 and 0.05 mm are provided, which are both attached to the swelling mat 104 the ring portion 116 or 116a and the outer surface of the ceramic body 103 are pressed. These thin metal foils form an absolutely gas-tight seal in the gap space in which the swelling mat 104 is arranged, but - especially if they are glued to the swelling mat 104 but not to the ring section 116 - hinder the thermal expansion of this ring section compared to the practically its diameter maintaining ceramic body 103.
  • the film 118 slides against the section 116 'of the ring section 116 which is inclined to the surface 119 of the ceramic body 103, which can be reflected in the form of a fold 120 indicated by the dashed line in FIG. 5, all of which Subsequent temperature changes regardless of a sliding of the film 118 on the ring section 116 intercepts the expansion differences between the ring section 116 and the ceramic body 103.
  • the foil should be up to max. extend to the apex 121 of the ring portion 116.
  • FIG. 6 shows an enlarged partial cross section along the line VI-VI in FIG. 4, from which the structure of the housing 101 from two half-shells can be seen. Accordingly, the individual strips of the swelling mat 104 are butted at this interface 122. In order to nevertheless achieve the desired seal along this edge, the metal foil is designed to overlap in this area.
  • the variant of the invention according to FIGS. 4 to 6 is not limited to the exemplary embodiment shown.
  • the exhaust gas flow also the outermost edge zones, i.e. can penetrate the outermost honeycombs of the ceramic body 103 - it would also be possible to also cover the gaps in the area of the gas outlet end faces 123 of the ceramic bodies 103 between the shielding plate ring sections 116a and 116 surrounding them with the aid of a film 118, although the problem can be seen there a blow-out risk is considerably smaller than in each case on the gas inlet end face 117.
  • the film 118 need not necessarily be made of metal, although, in the current state of the art, high-temperature-resistant gas-tight films can primarily be produced from metal for the purposes mentioned.

Claims (14)

1. Dispositif d'épuration catalytique des gaz d'échappement comportant au moins un corps céramique monolithique (10,11 ; 103) possédant une structure en nid d'abeilles, disposé dans un boîtier métallique extérieur (1) formé de deux coques et comportant des tubulures frontales d'amenée et d'évacuation des gaz d'échappement, et possédant un revêtement superficiel ayant une action catalytique, et dans lequel un mat élastique (13; 13'; 104) est intercalé entre le boîtier extérieur (1) et le corps céramique (10,11 ; 103), et les zones du boîtier extérieur situées en avant et en arrière des corps céramiques sont recouvertes par des capots de blindage, caractérisé en ce que les coques du boîtier extérieur (1) ainsi que les tubulures d'amenée et d'évacuation des gaz d'échappement sont des composants continus réalisés d'un seul tenant et en ce que dans le boîtier extérieur (1) ayant un rôle de support se trouve disposé un dispositif de retenue en forme de boîtier (boîtier intérieur) (2), qui est constitué en un matériau réfractaire, comportant éventuellement des évidements ou des interruptions dans la zone formant enveloppe des corps céramiques, est situé à distance du boîtier extérieur (1), au moins en dehors des sections de support des corps céramiques (10, 11) et (pour la compensation de dilatations thermiques différentes) est maintenu, au moins sur son extrémité frontale (18, 19, 20, 21), de manière à pouvoir avoir un déplacement axial libre.
2. Dispositif d'épuration catalytique des gaz d'échappement selon la revendication 1, caractérisé en ce que la fente entre le boîtier intérieur et le boîtier extérieur (2,1) est remplie, au moins par sections, par un mat isolant (13) notamment à base de fibres de silicate d'aluminuim ou ce qu'on appelle un mat gonflant.
3. Dispositif d'épuration catalytique des gaz d'échappement selon la revendication 1 ou 2, caractérisé en ce que le boîtier intérieur (2) s'applique, au niveau de la section de support des corps céramiques (10, 11), contre la surface intérieure du boîtier extérieur (1).
4. Dispositif d'épuration catalytique des gaz d'échappement selon la revendication 1 ou 2, caractérisé en ce que le boîtier intérieur (2) s'étend d'une manière continue à distance du boîtier extérieur (1) et comporte des évidements (12, 12'), qui sont situés à distance des faces frontales (18, 19, 20, 21) des corps céramiques (10, 11) et à l'aide desquels le mat élastique (13), qui prend appui contre le boîtier extérieur (1), est en contact direct avec la surface enveloppe des corps céramique (10, 11).
5. Dispositif d'épuration catalytique des gaz d'échappement selon la revendication 4, caractérisé en ce que les sections annulaires (15, 15') du bei- tier intérieur (2), qui entourent les extrémités frontales des corps céramiques (10, 11), comportent des fentes axiales (16) formant des languettes élastiques d'application (17) se terminant devant les surfaces frontales (18, 19, 20, 21).
6. Dispositif d'épuration catalytique des gaz d'échappement selon la revendication 5, caractérisé en ce que le mat élastique (13) s'engage au moins par-dessus les sections fendues du boîtier intérieur (29), sous l'action de la compression élastique des languettes d'application (17) contre la surface enveloppe du corps céramique (10, 11).
7. Dispositif d'épuration catalytique des gaz d'échappement selon l'une des revendications 4 à 6, caractérisé en ce que l'évidement (12, 12') du boî- tiei intérieur (2) est formé selon une disposition périphérique circulaire, réalisant un ajustement glissant pour les extrémités frontales formées.
8. Dispositif d'épuration catalytique des gaz d'échappement suivant la revendication 1 ou 2, caractérisé par le fait que le boîtier intérieur recouvre uniquement les surfaces intérieures des tubulures d'amenée et d'évacuation des gaz d'échappement ainsi que, éventuellement, l'espace intercalaire du boîtier extérieur, situé entre deux corps céramiques disposés l'un derrière l'autre, et en ce que la tôle conique ou cylindrique de blindage (106, 106a) entoure un corps céramique (103) sans aucun contact, à une certaine distance, au moins dans la zone de la face frontale (117) d'entrée des gaz de ce corps céramique, et que la fente formée par rapport au corps céramique (103) est recouverte par une feuille flexible mince (118) résistant à la température, notamment une feuille métallique, qui est repoussée par le support élastique (104) contre la tôle de blindage (106, 106') et contre le corps céramique (103).
9. Dispositif d'épuration catalytique des gaz d'échappement selon la revendication 8, caractérisé en ce que la feuille (118) est collée au support élastique (104) ou à la tôle de blindage (1 06a).
10. Dispositif d'épuration catalytique des gaz d'échappement selon la revendication 8 ou 9, caractérisé en ce que l'extrémité, qui entoure le corps céramique (103), de la tôle de blindage (106) est réalisée sous la forme d'une section annulaire (116, 116') cintrée avec une forme concave tournée vers l'extérieur.
11. Dispositif catalytique d'épuration des gaz d'échappement selon la revendication 10, caractérisé en ce que la feuille (118) s'étend au maximum jusqu'à la partie sommitale (121) de la section annulaire (116,116').
12. Dispositif d'épuration catalytique des gaz d'échappement selon l'une des revendications 8 à 11, caractérisé en ce que la feuille (118) est disposée de manière à être en recouvrement sur elle-même dans la zone des joints de séparation du support élastique (104) disposé autour du corps céramique (103).
13. Dispositif d'épuration catalytique des gaz d'échappement selon l'une des revendications 8 à 12, caractérisé en ce que la feuille (118) est réalisée en un acier spécial.
14. Dispositif d'épuration catalytique des gaz d'échappement selon la revendication 13, caractérisé en ce que la feuille en acier spécial possède une épaisseur comprise entre 0,01 mm et 0,1 mm et de préférence entre 0,02 mm et 0,05 mm.
EP86102020A 1985-02-22 1986-02-18 Dispositif d'épuration catalytique des gaz d'échappement Expired EP0193072B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3506219 1985-02-22
DE19853506219 DE3506219A1 (de) 1985-02-22 1985-02-22 Katalytische abgasentgiftungseinrichtung
DE3509790 1985-03-19
DE19853509790 DE3509790A1 (de) 1985-03-19 1985-03-19 Abgasreinigungsvorrichtung fuer kraftfahrzeuge

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EP0193072A1 EP0193072A1 (fr) 1986-09-03
EP0193072B1 true EP0193072B1 (fr) 1989-04-12

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Publication number Priority date Publication date Assignee Title
DE3700070A1 (de) * 1987-01-02 1988-07-14 Eberspaecher J Vorrichtung fuer die katalytische reinigung von fahrzeugmotor-abgasen
DE3811224A1 (de) * 1988-04-02 1989-10-12 Leistritz Ag Abgaskatalysator mit metallmonolith
DE3835841A1 (de) * 1988-10-21 1990-04-26 Eberspaecher J Abgaskonverter fuer eine brennkraftmaschine
DE3908887A1 (de) * 1989-03-17 1990-09-20 Eberspaecher J Vorrichtung zur katalytischen entgiftung oder dgl. von verbrennungsmotor-abgasen mit zwei abgas-behandlungskoerpern und einem schutzring dazwischen
DE3929205A1 (de) * 1989-09-02 1991-03-21 Leistritz Ag Abgasvorrichtung, insbes. abgasreinigungsvorrichtung
IT220490Z2 (it) * 1990-04-13 1993-09-24 Gilardini Spa Convertitore catalitico per veicoli, in particolare autoveicoli
DE4109626A1 (de) * 1991-03-23 1992-09-24 Eberspaecher J Halterung eines traegerkoerpers in abgasanlagen von fahrzeugen
US5980837A (en) * 1997-12-03 1999-11-09 Ford Global Technologies, Inc. Exhaust treatment device for automotive vehicle having one-piece housing with integral inlet and outlet gas shield diffusers
DE19910020A1 (de) * 1999-03-08 2000-09-14 Delphi Tech Inc Endstück für einen Katalysator
JP4325565B2 (ja) * 2005-02-10 2009-09-02 日産自動車株式会社 内燃機関の排気浄化装置および排気浄化方法
GB2568900B (en) * 2017-11-29 2020-09-02 Perkins Engines Co Ltd Exhaust gas treatment assembly comprising a gas permeable block and a housing, and method of assembly
FR3082235B1 (fr) * 2018-06-06 2020-05-15 Faurecia Systemes D'echappement Organe optimise de purification des gaz d'echappement

Citations (1)

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EP0176722A1 (fr) * 1984-09-01 1986-04-09 Leistritz Aktiengesellschaft Dispositif de désintoxication catalytique des gaz d'échappement

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DE2301646A1 (de) * 1973-01-13 1974-08-01 Pforzheim Metallschlauch Katalysatortopf fuer abgasleitungen
DE2458994A1 (de) * 1974-12-13 1976-06-16 Eberspaecher J Anordnung zur katalytischen reinigung von abgasen
DE2627596C3 (de) * 1976-06-19 1981-04-09 Zeuna Stärker GmbH & Co KG, 8900 Augsburg Vorrichtung zur katalytischen Reinigung der Abgase an Brennkraftmaschinen
DE2723532C3 (de) * 1977-05-25 1980-04-03 Zeuna-Staerker Kg, 8900 Augsburg Vorrichtung zum Entgiften der Abgase von Brennkraftmaschinen in Kraftfahrzeugen
FR2473623A1 (fr) * 1980-01-14 1981-07-17 Maremont Corp Ensemble de purification catalytique des gaz d'echappement de moteurs a combustion interne d'automobiles et procede de fabrication de cet ensemble
DE3433938A1 (de) * 1984-09-15 1985-10-24 Bayerische Motoren Werke AG, 8000 München Abgaskonverter fuer brennkraftmaschinen

Patent Citations (1)

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EP0176722A1 (fr) * 1984-09-01 1986-04-09 Leistritz Aktiengesellschaft Dispositif de désintoxication catalytique des gaz d'échappement

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