EP0719912A1 - Dispositif de traitement de gaz d'échappement d'un moteur à combustion interne - Google Patents

Dispositif de traitement de gaz d'échappement d'un moteur à combustion interne Download PDF

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Publication number
EP0719912A1
EP0719912A1 EP95118909A EP95118909A EP0719912A1 EP 0719912 A1 EP0719912 A1 EP 0719912A1 EP 95118909 A EP95118909 A EP 95118909A EP 95118909 A EP95118909 A EP 95118909A EP 0719912 A1 EP0719912 A1 EP 0719912A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
gas treatment
mat
wire
treatment device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95118909A
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German (de)
English (en)
Other versions
EP0719912B1 (fr
Inventor
Georg Wirth
Siegfried Wörner
Peter Dr. Zacke
Klaus Hoffmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberspaecher Climate Control Systems GmbH and Co KG
Original Assignee
J Eberspaecher GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19511503A external-priority patent/DE19511503A1/de
Application filed by J Eberspaecher GmbH and Co KG filed Critical J Eberspaecher GmbH and Co KG
Publication of EP0719912A1 publication Critical patent/EP0719912A1/fr
Application granted granted Critical
Publication of EP0719912B1 publication Critical patent/EP0719912B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N3/2857—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
    • 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
    • F01N3/2864—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 comprising two or more insulation layers
    • 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
    • F01N13/14—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 thermal insulation
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/02—Fitting monolithic blocks into the housing

Definitions

  • the wire mat protects the annular space between itself and the housing, which is normally occupied by the storage mat or an insulating mat, against the direct effect of the hot and pulsating exhaust gas.
  • the wire mat can fulfill this protective function, even though it is gas-permeable by itself. According to the invention, however, it was found that the provision of a wire mat at this point brings with it a number of advantages compared to the previously customary sheet metal rings or ceramic rings, in particular with regard to more rational production and easier assembly of the exhaust gas treatment device. The following description will contain even more detailed explanations.
  • exhaust gas treatment body is intended to be treatment body for the catalytic detoxification of exhaust gases (extensive removal of unburned hydrocarbons, carbon monoxide and nitrogen oxides) and treatment bodies for filtering out particles from diesel engine exhaust gas, possibly also with a catalytically favored conversion of the filtered out particles.
  • the most common types of the first-mentioned exhaust gas treatment bodies are ceramic monoliths and treatment bodies wound from sheet metal sheets, both types having a large number of longitudinal flow channels and the channel walls being coated with a substance containing a catalyst.
  • ceramic filters, sintered metal filters and wound filters made of temperature-resistant threads are particularly suitable.
  • storage mats made of sufficiently temperature-resistant fibers or so-called swelling mats are preferred, in which mica particles are embedded in a basic structure made of fibers; if a swelling mat is brought to a higher temperature during operation of the exhaust gas treatment device, the volume of the mica particles increases greatly, the storage mat generates a prestress between the storage area of the housing and the exhaust gas treatment body (s) of the desired size.
  • inflow funnel and "outflow funnel” refer to components of the housing that make a transition from the smaller cross-section of an exhaust pipe, into which the exhaust gas treatment device is or is to be installed, and the larger cross-section of the storage area of the housing.
  • the cross section widens in the direction of flow, while in the case of the outflow funnel the flow cross section narrows in the direction of flow.
  • the inflow funnel and the outflow funnel do not have to have an exact or approximate conical shape.
  • a large number of different geometric shapes are known, in particular also asymmetrical shapes in cross section or in longitudinal section. All that matters is the function of the transition of the flow cross-section. -
  • double-walled inflow funnels and outflow funnels are preferred within the scope of the invention, as will be shown further below in the exemplary embodiments.
  • the wire mat mentioned is preferably a flat structure with a fairly small thickness compared to its dimensions in the surface. Wire mats with a thickness of less than 1 mm, apart from the impressions to be mentioned further below, are preferred.
  • the wire mat is preferably strip-shaped, i.e. in the circumferential direction of the exhaust gas treatment body so long that it can be placed around the clearance space at least once, but measured in the longitudinal direction of the exhaust gas treatment device only so wide that it bridges the clearance space and covers a little bit each of the two final exhaust gas treatment bodies.
  • the exhaust gas treatment device has at least one storage mat. This can be provided, for example, for the two or more exhaust gas treatment bodies at the same time. On the other hand, a separate or even several storage mats can be provided for each exhaust gas treatment body.
  • the exhaust gas treatment device has at least two exhaust gas treatment bodies in the longitudinal direction or in the flow direction one behind the other. It is pointed out that more than two exhaust gas treatment bodies can also be provided one behind the other, three exhaust gas treatment bodies one behind the other being quite common. If there are more than two exhaust gas treatment bodies in a row, there is naturally more than one space between adjacent exhaust gas treatment bodies.
  • the measures specified in the patent claims are preferably implemented in an analogous manner on the further spacing space or the further spacing spaces. However, it is also possible to work with other measures there.
  • the wire mat consists of austenitic steel wire with a wire thickness of at least 0.1 mm, particularly preferred wire thicknesses being in the range from 0.15 to 0.25 mm.
  • Wire mats made of Inconel wires with wire thicknesses of less than 1 mm are known. It has surprisingly been found that the invention preferred steel wires are less prone to embrittlement and scaling during short-term temperature peaks. The higher stiffness of the wire mat associated with the relatively high wire thickness is desirable at least in some of the construction and assembly situations.
  • a wire mat designed as a wire mesh is preferably provided.
  • Wire mesh can be produced relatively "tightly" and then offer a tangible flow resistance in the desired manner.
  • the wire fabrics are preferably used in such a way that their wire threads run obliquely to the longitudinal direction of the housing, in particular in such a way that both thread directions of the fabric run at approximately 45 ° to the longitudinal direction of the exhaust gas treatment device. With such. The course of the wire threads is best counteracted by the formation of dents in the wire mesh when the length of the wires is increased as a result of the increased temperature.
  • Wire mesh made of wire mesh.
  • Wire mesh is more adaptable and flexible than wire mesh and is less prone to bulging at elevated temperatures. If the greater stiffness of the wire mesh is not desired, in particular with certain types of assembly of the exhaust gas treatment device, wire mesh can therefore be used advantageously.
  • Wire mesh with omega-shaped meshes is particularly preferred.
  • the wire mesh is preferably used in such a way that the thread running direction lies in the longitudinal direction of the exhaust gas treatment device (which gives the greatest rigidity in the longitudinal direction) and the stitch direction lies in the circumferential direction (which results in a certain compressibility in this direction). You can use the wire mesh with the direction of the thread and the direction of the stitching in exactly the opposite way, e.g. pulled as a wire mesh hose over the end regions of the two adjacent exhaust gas treatment bodies.
  • the wire mesh strip When using a wire mesh strip with the described oblique course of the wire threads, the wire mesh strip is preferably cut obliquely at its circumferential ends in accordance with the course of the wire threads. In this way you avoid fraying on the Circumferential ends, which would make it difficult to attach the wire mesh strip.
  • a first preferred possibility is to provide the wire mat in one layer, one of the possible types, namely as a tubular wire mat, having already been mentioned.
  • the single-layer wire mat usually has an overlap in the circumferential direction. Spot welding can be provided at the overlap, but this is unnecessary in many cases.
  • the wire mat in multiple layers, in particular by repeatedly wrapping it around the arrangement of two adjacent exhaust gas treatment bodies, folding it up before wrapping it around, or wrapping around a tube which is pressed flat to form two layers.
  • the wire mat has impressions directed outwards or inwards, preferably arranged in an arrangement pattern.
  • the embossing provides directions or bending lines for any deformation of the wire mat when the temperature rises.
  • the impressions can be more linear, in particular in the longitudinal direction of the exhaust gas treatment device, or more punctiform, e.g. hemispherical or rounded-conical.
  • an arrangement pattern with a course at an angle to the longitudinal direction of the exhaust gas treatment device is favorable.
  • the wire mat has at the transition between its area bridging the space and their area lying on the circumference of an exhaust gas treatment body has a shoulder to create a longitudinally effective contact surface.
  • the swelling mat is impregnated with a binder at least in one of those areas where high-temperature stress can occur, creating adhesion at fiber crossing points and avoiding extensive void filling. Because of this impregnation, the fibers of the ceramic fiber framework are held together in such a way that they are not carried away by the pulsating exhaust gas. Furthermore, the mica particles are bound and prevented from moving between the fibers. The stabilizing effect due to the impregnation is still present even if the swelling mat has been locally heated to over 850 ° C and the mica particles in the overheated area have at least partially lost their expansion properties.
  • the impregnation according to the invention deliberately avoids extensive void filling between the fibers of the swelling mat, but rather aims at bonding the fibers only at the fiber crossing points; a layer closing the surface of the swelling mat should not be formed.
  • considerable residual elasticity is retained in the impregnated area of the swelling mat in order to ensure that the exhaust gas treatment body is held even under changing temperatures, even if the mica particles in the impregnated area have already overheated.
  • the insulation effect is largely retained by the gas-filled cavities between the fibers.
  • Areas of the swelling mat that are particularly predestined for impregnation due to the temperature and pulsation stress are the axial end areas, especially at the inflow end, and the area bridging the space between the two exhaust gas treatment bodies. In practice, so much binder is applied that it penetrates a few mm at the swell mat face and penetrates from the inside for part of the thickness of the swell mat at the area bridging the spacing space.
  • binders based on an organometallic compound in particular silane, of potassium methyl siliconate, of sodium methyl siliconate, or of aluminum phosphate, in particular monoaluminum phosphate or aluminum chromium phosphate.
  • the binder can preferably be introduced as an aqueous solution or in an organic solution.
  • the impregnation dries in the air very soon after application.
  • the consistency and amount of the impregnating agent can be conveniently adjusted so that it penetrates into the swelling mat as described above; a wetting agent can also be used as an additive.
  • the impregnation according to the invention also has the effect of the mica particles rising at a correspondingly elevated temperature, ie. H. to hinder or reduce the thermal activity of the swelling mat locally.
  • the wire mat is at least in the area of the exhaust gas treatment body distance surrounded by a glass fiber insulating mat, which consists of glass fibers drawn through nozzles, essentially without fine dust content and essentially without coarse particles.
  • a glass fiber insulating mat which consists of glass fibers drawn through nozzles, essentially without fine dust content and essentially without coarse particles.
  • the storage mat designed as a swelling mat continuously for the two exhaust gas treatment bodies, so that it also bridges the space.
  • the glass fibers of the insulating mat are preferably brought to a higher percentage SiO 2 content by leaching and thus to higher temperature resistance.
  • This treatment of glass fibers is called leachen; normal glass becomes more quartz glass.
  • a glass fiber material containing 30 to 40% SiO 2 is converted into a kind of quartz glass with about 60% SiO 2 by the leaching, the rest mainly CaO.
  • the higher the SiO 2 content of the glass fiber material the higher its softening temperature.
  • the softening temperature of the glass fibers can be adjusted to the desired temperatures in the range of approximately 500 to 950 ° C. by leaching out different raw glasses.
  • the insulating mat is preferably designed as a glass fiber fleece, preferably needled to form a glass fiber felt.
  • the needling mechanically binds the filament strands perpendicular to their direction of travel so that a firm, elastic felt is obtained even without a binder.
  • the described film formation by sintering glass fibers together at the crossing points can also be generated by preheating the exhaust gas treatment device before installation in a motor vehicle with the aid of hot gas.
  • the insulating mat can be made of knitted fiber or woven fabric, also in multiple layers, ceramic fibers and glass fibers being particularly preferred.
  • the construction of the insulating mat from textured (fluffed) single thread is cheap in order to improve the insulation properties by installing the smallest voids.
  • An intermediate layer of particularly resistant, densely woven or knitted fiber material can be provided between the insulating mat and the wire mat.
  • the special glass fiber insulating material described on the last pages can be provided not only as the wire mat in the area of the surrounding insulating strips, but also at other points in the exhaust gas treatment device. So you can use this glass fiber insulation mat in particular as a mounting mat for exhaust gas treatment body or for the insulation layer in double-walled inflow funnels or outflow funnels.
  • the invention further relates to methods for assembling an exhaust gas treatment device of the type disclosed in the present application.
  • a first method according to the invention is characterized in that the storage mat and the wire mat are combined to form a preassembled unit and are assembled as a preassembled unit with the two exhaust gas treatment bodies and the storage area of the housing.
  • the pre-assembled unit is placed around the two exhaust treatment bodies in a first step; then the exhaust gas treatment body / wire mat / storage mat assembly is assembled with the storage area of the housing.
  • a second method according to the invention is characterized in that the two exhaust gas treatment bodies and the wire mat are combined to form a preassembled unit and are assembled as a preassembled unit with the at least one storage mat and the storage area of the housing. In most cases, laying the storage mat around takes place in a first step and assembly with the housing in a second step.
  • a third method according to the invention is characterized in that the two exhaust gas treatment bodies, the wire mat and the at least one storage mat are combined to form a preassembled unit and are assembled as a pre-assembled unit with the storage area of the housing.
  • wire mat and / or the storage mat are preferred for the union of the wire mat with the storage mat.
  • adhesive bonding and / or hooking by means of bent wire ends of the storage mat are preferred.
  • the wire mat and / or the storage mat be combined with the two exhaust gas treatment bodies to form a preassembled unit, it is preferred that the wire mat and / or the storage mat be glued to the two exhaust gas treatment bodies or the relevant exhaust gas treatment body.
  • the wire mat projecting over the storage mat at one circumferential end is pushed under with the protrusion under the other circumferential end of the wire mat for unification or assembly with the exhaust gas treatment bodies. This results in a complete shielding of the positioning mat or the insulating mat provided there.
  • the wire mat and the storage mat When creating an arrangement of the two exhaust gas treatment bodies, the wire mat and the storage mat, one can proceed in such a way that - for example, by means of stops for the facing ends of the two exhaust gas treatment bodies facing away from one another in an assembly device - the manufacturing tolerance of the exhaust gas treatment body in the longitudinal direction by a lengthening in the longitudinal direction or shorter adjusting distance between the two exhaust gas treatment bodies is added, so that this arrangement can be assembled with the desired length with the storage area of the housing.
  • the end faces of the exhaust gas treatment bodies are relatively sensitive to impact on their outer edge
  • a very narrow gap there in particular with respect to the inner wall of a double-walled inflow funnel or outflow funnel, is of great advantage in order to allow the storage mat to be exposed to the hot and pulsating exhaust gas through the gap as possible to keep low.
  • a preferred possibility of how, when assembling the two exhaust gas treatment bodies, in particular as a preassembled arrangement with the wire mat and the storage mat, with the storage area of the housing it is possible to shift the exhaust gas treatment body relative to the storage area of the housing for the purpose of achieving the desired relative position described is the previously mentioned gluing with the wire mat and / or the storage mat, and preferably with a tough elastic adhesive that still allows the necessary smaller displacements.
  • the two exhaust gas treatment bodies are assembled as an exhaust gas treatment body arrangement with at least one spacer element between the two exhaust gas treatment bodies with the storage area of the housing, the at least one spacer element being designed such that it is volatile from the assembled exhaust treatment device is removable.
  • Working with spacer elements greatly simplifies the assembly of the exhaust gas treatment device because the exhaust gas treatment bodies have a quasi-defined relative position to one another that can only be changed in a targeted manner.
  • Very particularly favorable conditions result if at least one flexible spacing element is used which allows the two exhaust gas treatment bodies to be pushed together with a pushing force at a smaller distance. This measure enables a combination of the described procedures of tolerance acceptance with the advantages of the spacing elements.
  • the spacer elements are preferably either combustible without residue or evaporable.
  • Particularly preferred materials are polyethylene or cardboard or CO 2 in the solid state.
  • Polyethylene or cardboard can easily be provided in such a consistency or design that they are flexible in the longitudinal direction with the application of force, for example as polyethylene foam or as deliberately flexible cardboard blocks designed in the longitudinal direction.
  • the last-mentioned assembly method is particularly preferred.
  • the advantages of the wire mat bordering the spacing space and / or the at least one spacing element for carrying out the assembly are particularly evident here.
  • the storage mat in the area with which it bridges the space between the two exhaust gas treatment bodies is impregnated with a binder to create a bond at fiber crossing points and avoid extensive filling of the void before it is coated with the wire mat, the two exhaust gas treatment bodies and the storage area of the housing is assembled.
  • the storage mat is preferably a swelling mat.
  • the impregnation is preferably carried out from that side of the bedding mat which faces inwards after assembly, and preferably the impregnation does not go all the way to the outside.
  • the bearing mat is preferably impregnated in one or both axial end regions with a binding agent to create adhesion at fiber crossing points and to avoid extensive void filling after it has been assembled with the two exhaust gas treatment bodies and the bearing region of the housing.
  • the instillation of binder from the face of the exhaust gas treatment body in question has proven to be a particularly favorable method of introduction. It is also from a number of Favorable reasons if the axial ends of the storage mat are set back a little in comparison to the end faces of the exhaust gas treatment body there.
  • the storage mat is preferably a swelling mat.
  • the exhaust gas treatment device 2 shown in FIG. 1 has a housing 4, which - progressing in the flow direction from left to right in FIG. 1 - consists of an inflow funnel 6, a storage area 8 and an outflow funnel 10.
  • the inflow funnel 6 is welded to the exhaust pipe (not shown) at its left end and the outflow funnel 10 at its right end.
  • the inflow funnel 6 and the outflow funnel 10 are double-walled, an insulating mat 16 made of fiberglass felt, leached, being present between the outer wall 12 and the inner wall 14.
  • the funnels 6, 10 and the storage area 8 of the housing 4 can be most easily imagined with a circular cross-section, although other cross-sectional shapes are also possible, in which case the funnels 6, 10 have to produce a cross-sectional transition to the exhaust pipe.
  • a storage mat 18 which is designed as a swelling mat
  • two exhaust gas treatment bodies 20 are held one behind the other in the storage area 8 in the longitudinal direction of the exhaust gas treatment device 2 or in the flow direction of the exhaust gas.
  • the storage mat 18 extends almost over the entire length of the storage area 8 and thus bridges the space 22. However, it ends in each case a short distance of a few millimeters in front of the mutually facing end faces 24 of the two exhaust gas treatment bodies 20.
  • FIG. 2 shows the storage mat 18 in the state in which it is spread out on the drawing plane, the later inside of the storage mat 18 facing the reader.
  • the positioning mat 18 has a projection 28 which is rectangular in the viewing direction of FIG. 2 and with which a corresponding recess 30 at the other circumferential end 32 of the positioning mat 18 corresponds.
  • the protrusion 28 engages in the recess 30 so that there is no circumferential joint of the storage mat 18 which is linearly continuous in the axial direction.
  • an impregnation zone 34 is shown by dotting.
  • the impregnation zone 34 is strip-shaped and runs in the (later) circumferential direction of the storage mat 18.
  • the impregnation zone 34 measured in the longitudinal direction of the device 2, is considerably wider than the spacing space 22, for example twice as wide.
  • the Impregnation zone 34 is formed by trickling or spraying a binder, for example a silane, onto the flat side of the support mat 18 facing the reader in FIG. 2, the binder having been applied in such an amount that it does not penetrate the entire thickness of the support mat 18 .
  • a strip-shaped wire mat 36 designed as wire mesh in the illustrated embodiment, is placed on the strip-shaped impregnation zone 34.
  • the wire mesh strip measured in the longitudinal direction of the device 2, is less wide than the impregnation zone 34, but still significantly wider than the spacing space 22.
  • the wire mesh strip consists of mutually parallel, first wire threads 38 and parallel, second wire threads 40, the second wire threads 40 are woven with the first wire threads 38 and are perpendicular to them.
  • the wire threads are made of austenitic steel, preferably steel 1.4401 (AISI 316), 1.4541 (AISI 321), 1.4828 (AISI 309) or 1.4841 (AISI 314 SS) with a wire thickness of 0.2 mm.
  • the wire mesh strip is cut parallel to the direction of the first wire threads 38, ie at 45 ° to the shape of the axial ends 44 of the wire mesh strip 36.
  • the wires 38, 40 are bent toward the support mat 18. By pressing in these bent wire ends, the wire mesh strip 36 has got caught in the storage mat 18.
  • the wire mesh strip 36 extends beyond the circumferential end 32 of the storage mat 18 to such an extent that this overhang 46 - after the preassembled unit comprising the storage mat 18 and wire mesh strip 36 has been placed around the exhaust gas treatment body 20 - under the other end 48 of the wire mesh strip 36 can be pushed under.
  • Fig. 1 shows the fully assembled state.
  • the preassembled unit made of storage mat and wire mesh strip 36 combined therewith has been placed around the two exhaust gas treatment bodies 20 in such a way that the wire mat 36 has the space 22 on its circumference bounded and on both sides an axial piece rests on the circumference of the exhaust gas treatment body 20.
  • the storage mat 18 has preferably been glued to the peripheries of the exhaust gas treatment body 20 by means of a tough elastic adhesive.
  • This arrangement has then preferably been inserted in the axial direction into the tubular bearing area 8, in such a way that the end faces 24 of the exhaust gas treatment body 20 facing away from one another were at a somewhat greater distance from one another than the design target distance in the fully assembled device 2.
  • binder for example a silane
  • binder for example a silane
  • the two funnels 6 and 10 are then moved in an assembly device in the axial direction until they strike the axially facing sheet metal edges of the storage area 8.
  • Either the two exhaust gas treatment bodies 20 have been pushed together beforehand to the desired position (depending on the actual length of the storage area 8) by means of movable punches, or one does this by pushing the funnels 6, 10 forward.
  • the funnels 6, 10 with the storage area 8 are also included the triple seam drawn, which covers the sheet metal of the storage area 8, the outer wall 12 of the funnel 6 and 10 in question and the radially outward-pointing edge of the inner wall 14 of the funnel 6 and 10 concerned, welded.
  • the set relative position of the end faces 24 of the exhaust gas treatment body 20 relative to the inner walls 14 of the two funnels 6, 10 in the manner described is in any case such that there is practically no or only a very narrow gap between the outer edge of the relevant end face 24 and one Region of the inner wall 14 of the funnel 6 or 10 in question, where this inner wall extends essentially in the radial direction.
  • the bedding mat 18 has been pressed together to about 2/3 of its initial thickness, so that the exhaust gas treatment body 20 even before the first heating of the bedding mat 18 with a certain preload in the Housing 4 are supported.
  • the adhesive between the storage mat 18 and the peripheries of the exhaust treatment body 20 is such that it allows the described movement of the exhaust treatment body 20 relative to the storage mat 18 during assembly.
  • the exhaust gas treatment bodies 20 are also shifted by small distances relative to the wire mat 36.
  • the described manner of applying binder in the central, strip-shaped impregnation zone 34 and in the two axial end regions 50 of the bearing mat 18 has the advantage that the tool with which the arrangement of the two exhaust gas treatment bodies 20, the wire mat 36 and the bearing mat 18 in the storage area 8 of the housing 4 is inserted, is not contaminated with the binder.
  • a strip-shaped wire mat 36 is illustrated, which is deformed with two (in the attached state) circumferential shoulders 52, whereby contact surfaces of low radial height are formed for the end faces of the two exhaust gas treatment bodies 20 facing the space 22.
  • the positioning mat 18 designed as a swelling mat does not pass longitudinally over the two exhaust gas treatment bodies 20, but is divided into two positioning mats 18.
  • an insulating mat 54 in the form of a ring strip is installed in the area of the wire mat 36, but measured somewhat less in the longitudinal direction of the device 2. This consists of a glass fiber felt, taught to such a softening temperature of the glass fiber material that a tough elastic protective film is formed during sintering together of the glass filaments at the crossing points on the inside of the insulating mat 54.
  • ring-shaped insulating mat applies only to the overall configuration.
  • the entire circumference of the mat can be divided into several parts, here three parts, which abut each other in the circumferential direction. If the glass fiber felt material shrinks somewhat under temperature stress, the gaps at the joints will still be small enough. You can also see that each of the three mat parts is folded - two layers, with the peripheral joint on the cold mat side.
  • the insulating mat 54 measured in the longitudinal direction of the device 2, is less wide than the wire mat 36, so that the wire mat 36 is pressed in its two axial end regions by a bearing mat 18 against the circumference of an exhaust gas treatment body 20.
  • the spacing elements 58 are flexible in the longitudinal direction of the device 2 when axial force is applied and are e.g. provided as a polyethylene foam cushion or as a flexible cardboard block.
  • impressions 60 in the wire mat 36 illustrate impressions 60 in the wire mat 36.
  • more punctiform impressions 60 arranged in rows according to the direction of the wire run, are provided, while in the exemplary embodiment of FIG. 7, more linearly-axially oriented impressions 60 are provided sees.
  • bending lines or bulges are specified for the wire mat 36; working of the wire mat 36 in the event of temperature stress takes place more in a concertina-shaped structure.
  • the impressions 60 are only provided where the wire mat 36 delimits the space 22 and does not rest on the circumference of the exhaust gas treatment body 20.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (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)
EP95118909A 1994-12-30 1995-12-01 Dispositif de traitement de gaz d'échappement d'un moteur à combustion interne Expired - Lifetime EP0719912B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4447278 1994-12-30
DE4447278 1994-12-30
DE19511503A DE19511503A1 (de) 1994-12-30 1995-03-29 Abgasbehandlungsvorrichtung für Verbrennungsmotorenabgase
DE19511503 1995-03-29

Publications (2)

Publication Number Publication Date
EP0719912A1 true EP0719912A1 (fr) 1996-07-03
EP0719912B1 EP0719912B1 (fr) 2000-02-02

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EP95118909A Expired - Lifetime EP0719912B1 (fr) 1994-12-30 1995-12-01 Dispositif de traitement de gaz d'échappement d'un moteur à combustion interne

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EP (1) EP0719912B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002053511A1 (fr) * 2000-12-28 2002-07-11 3M Innovative Properties Company Materiau d'isolation thermique et dispositif de controle de la pollution utilisant celui-ci
US6967006B1 (en) * 1998-01-28 2005-11-22 J. Eberspächer GmbH & Co. KG Method for mounting and insulating ceramic monoliths in an automobile exhaust system and a mounting produced according to this method
WO2006008114A1 (fr) * 2004-07-16 2006-01-26 Faurecia Abgastechnik Gmbh Dispositif d'epuration des gaz d'echappement pour vehicules a moteur
US7524546B2 (en) 2000-12-28 2009-04-28 3M Innovative Properties Company Thermal insulating material and pollution control device using the same
FR3085427A1 (fr) * 2018-08-29 2020-03-06 Psa Automobiles Sa Procede de controle d’un moteur thermique pour la combustion d’une entretoise de dispositif de depollution d’une ligne d’echappement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3835841A1 (de) * 1988-10-21 1990-04-26 Eberspaecher J Abgaskonverter fuer eine brennkraftmaschine
EP0415101A1 (fr) * 1989-09-02 1991-03-06 Leistritz Aktiengesellschaft Système d'échappement, en particulier dispositif de purification de gaz d'échappement
EP0472009A1 (fr) * 1990-08-22 1992-02-26 Firma J. Eberspächer Dispositif de purification de gaz d'échappement avec deux corps de traitement de gaz l'un après l'autre
DE4201426A1 (de) * 1992-01-21 1993-07-22 Leistritz Abgastech Abgasreinigungsvorrichtung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3623786A1 (de) * 1985-11-13 1987-05-14 Man Technologie Gmbh Verfahren zur herstellung von russfiltern

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3835841A1 (de) * 1988-10-21 1990-04-26 Eberspaecher J Abgaskonverter fuer eine brennkraftmaschine
EP0415101A1 (fr) * 1989-09-02 1991-03-06 Leistritz Aktiengesellschaft Système d'échappement, en particulier dispositif de purification de gaz d'échappement
EP0472009A1 (fr) * 1990-08-22 1992-02-26 Firma J. Eberspächer Dispositif de purification de gaz d'échappement avec deux corps de traitement de gaz l'un après l'autre
DE4201426A1 (de) * 1992-01-21 1993-07-22 Leistritz Abgastech Abgasreinigungsvorrichtung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6967006B1 (en) * 1998-01-28 2005-11-22 J. Eberspächer GmbH & Co. KG Method for mounting and insulating ceramic monoliths in an automobile exhaust system and a mounting produced according to this method
WO2002053511A1 (fr) * 2000-12-28 2002-07-11 3M Innovative Properties Company Materiau d'isolation thermique et dispositif de controle de la pollution utilisant celui-ci
US7524546B2 (en) 2000-12-28 2009-04-28 3M Innovative Properties Company Thermal insulating material and pollution control device using the same
WO2006008114A1 (fr) * 2004-07-16 2006-01-26 Faurecia Abgastechnik Gmbh Dispositif d'epuration des gaz d'echappement pour vehicules a moteur
FR3085427A1 (fr) * 2018-08-29 2020-03-06 Psa Automobiles Sa Procede de controle d’un moteur thermique pour la combustion d’une entretoise de dispositif de depollution d’une ligne d’echappement

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