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EP3085916A1 - Device for purifying exhaust gases and exhaust line comprising said device - Google Patents

Device for purifying exhaust gases and exhaust line comprising said device Download PDF

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Publication number
EP3085916A1
EP3085916A1 EP15305614.8A EP15305614A EP3085916A1 EP 3085916 A1 EP3085916 A1 EP 3085916A1 EP 15305614 A EP15305614 A EP 15305614A EP 3085916 A1 EP3085916 A1 EP 3085916A1
Authority
EP
European Patent Office
Prior art keywords
purification device
purification
substrate
exhaust gas
sections
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
EP15305614.8A
Other languages
German (de)
French (fr)
Other versions
EP3085916B1 (en
Inventor
Jean-Paul Brunel
Marc Leroux
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.)
Faurecia Systemes dEchappement SAS
Original Assignee
Faurecia Systemes dEchappement SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Faurecia Systemes dEchappement SAS filed Critical Faurecia Systemes dEchappement SAS
Priority to EP15305614.8A priority Critical patent/EP3085916B1/en
Priority to KR1020160048054A priority patent/KR20160125900A/en
Publication of EP3085916A1 publication Critical patent/EP3085916A1/en
Priority to KR1020180096936A priority patent/KR101982979B1/en
Application granted granted Critical
Publication of EP3085916B1 publication Critical patent/EP3085916B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F01N13/011—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 purifying devices arranged in parallel
    • F01N13/017—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 purifying devices arranged in parallel 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
    • F01N13/001—Gas flow channels or gas chambers being at least partly formed in the structural parts of the engine or machine
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/06—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet in opposite directions

Definitions

  • the invention generally relates to exhaust gas purification devices.
  • Such purification devices with a U-shaped architecture are frequently used in vehicles with rear-exit engines. They are placed in the engine compartment.
  • the Figures 1 and 2 represent a U-shaped purification device according to the state of the art.
  • the first and second substrates 2 and 4 are cylindrical blocks having, perpendicular to the first and second directions, circular sections.
  • the outlet of the first purification member is connected to the inlet of the second purification member by a volume 6, formed of a bezel 8 and a cover 10.
  • the bezel 8 is a plate having two orifices 12, 14 of sections circular, to which the first and second purification members are attached.
  • the orifices 12 and 14 are delimited by collars, visible on the figure 1 .
  • the inlet of the first purification member is defined by an inlet cover 15, visible on the figure 1 .
  • the invention aims to provide a purification device which is more compact.
  • the invention relates to a purification device of the aforementioned type, characterized in that the volume is delimited by a cup-shaped lid attached directly to the first and second outer shells.
  • the lid is not attached to a bezel-shaped piece such as the piece 8 shown on the figure 1 , this being in turn attached to the first and second envelopes 28, 34. Due to the absence of a spectacle-shaped part, it becomes possible to bring the first and second purification members 20, 24 one of them closer together. on the other and thus make the purification device much more compact.
  • the lid is in turn smaller. The disappearance of the bezel, and the fact that the lid is smaller, to lighten the purification device and reduce the thermal inertia of this device. In addition, the number of connections is reduced, which makes it possible to reduce the number of weld seams.
  • the dimensions of the spectacle-shaped part in particular the separation between the inlet and the outlet, are constrained, in the state of the art of the Figures 1 and 2 by providing enough material to form the necks surrounding the inlet and the outlet.
  • the invention relates to an exhaust line comprising a purification device having the above characteristics.
  • the device 1 represented on the figure 3 is intended for the purification of the exhaust gases of a vehicle, typically of a motor vehicle equipped with an engine thermal such as a car or a truck.
  • the purification device 1 is intended to be integrated in an exhaust line. It is connected upstream to a collector sensing the exhaust gas leaving the combustion chambers of the engine, and downstream to a cannula for releasing purified exhaust gas into the atmosphere.
  • the collector and the cannula are not represented.
  • Other equipment is generally interposed between the purification device and the collector, for example a turbo compressor. Still other equipment, such as silencers, are interposed between the purification device and the cannula.
  • the purification device 1 comprises an exhaust gas inlet 16, fluidly communicating with the upstream part of the exhaust line, and an exhaust gas outlet 18, fluidly communicating with the downstream part of the exhaust line. .
  • Upstream and downstream are meant here relative to the direction of normal exhaust gas flow.
  • the first and second directions D1, D2 are parallel and opposite to each other. Alternatively, they are slightly inclined relative to each other.
  • the longitudinal direction will be called a direction parallel to, or substantially parallel to, the first and second directions.
  • the first purification member 20 further comprises a first outer casing 28 delimiting a first exhaust gas inlet 30 in the first purification unit, and a first exhaust gas outlet 32 out of the first purification unit.
  • the second purification member 24 comprises a second outer envelope 34 delimiting a second exhaust gas inlet 36 inside the second purification member, and a second exhaust outlet 38 out of the second purification.
  • the first and second substrates 22, 26 are housed inside the first and second envelopes 28, 34 respectively.
  • the purification device 1 further comprises a volume 40, fluidly connecting the first outlet 32 to the second inlet 36.
  • first and second purification members 20, 24 are arranged side by side and substantially parallel to each other.
  • first and second purification members have respective central axes parallel to one another, these central axes being typically longitudinal, that is to say parallel to the first and second directions.
  • the central axis of the first purification member is defined as the axis passing through the centers of all the straight sections of the first purification member, these straight sections being taken perpendicularly to the first direction.
  • the central axis of the second purification member corresponds to the axis passing through the centers of all the straight sections of the second purification member, these straight sections being taken perpendicularly to the second direction.
  • the first and second purification members are arranged side by side, in the sense that first and second respective surfaces 42, 44 of the first and second substrates 22, 26 are placed facing each other, c that is to say one face to the other.
  • the first substrate 22 has, perpendicular to the first direction, a first section having a first perimeter, the first surface 42 having, perpendicular to the first direction, a first width of between 7% and 50% the first perimeter.
  • the second substrate 26 has perpendicularly to the second direction a second section having a second perimeter, the second surface 44 having, perpendicular to the second direction, a second width of between 7% and 50% of the second perimeter.
  • the first perimeter corresponds to the perimeter of said section.
  • the second substrate typically has a constant cross-section along the second direction.
  • the second perimeter corresponds to the perimeter of this cross-section.
  • the second substrate has straight sections that vary slightly along the second direction.
  • the second perimeter is the average of the perimeters of all the straight sections of the second substrate.
  • the first width corresponds to the width of the first surface 42 taken perpendicular to the first direction.
  • the first width is taken along the perimeter of the first substrate 22.
  • the second width corresponds to the width of the second surface 44 taken perpendicular to the second direction, following the perimeter of the second substrate 26.
  • the first width is greater than 7% of the first perimeter, preferably greater than 10% of the first perimeter, and even more preferably greater than 15% of the first perimeter. It is less than 50% of the first perimeter, which means that the first substrate 22 is not entirely housed in the second substrate 26, but is placed next to it.
  • the second width is greater than 7% of the second perimeter, preferably greater than 10% of the second perimeter and more preferably greater than 15% of the second perimeter. It is less than 50% of the second perimeter, which means that the second substrate 26 is not entirely housed in the first substrate 22.
  • the first surface 42 has for example a constant width when following said surface 42 in the first direction.
  • the first width then corresponds to said width.
  • the first surface has a variable width when following the first surface parallel to the first direction.
  • the width of the first surface considered in section perpendicular to the first direction is then chosen as the first width.
  • the second surface 44 may have a constant width when it follows in the second direction, said width then corresponding to the second width.
  • the second surface has variable widths when followed in the second direction. The second width is then considered as the average of the widths of the second surface considered in section perpendicular to the second direction.
  • the first and second surfaces 42, 44 have respective shapes co-adapted such that at least one of the first and second surfaces 42, 44 is separated at all points from the other of the first and second surfaces 42, 44 by a distance less than 30 mm, preferably less than 25 mm, a distance between the envelopes 28 and 34 less than 10 mm, preferably less than 5 mm.
  • the first and second surfaces 42, 44 extend longitudinally substantially the entire length respectively of the first and second substrates 22, 26.
  • each point of the first surface 42 is placed opposite a point of the second surface 44, but the opposite is not true, because the first substrate 22 is shorter than the second substrate 26.
  • the second substrate 26 is shorter than the first substrate 22, each point of the second surface thus being placed opposite a point of the first surface.
  • the first and second substrates are of the same length, each point of the first surface thus being placed opposite a point of the second surface.
  • the distance from one point of the first surface 42 to the second surface is taken by considering a direction perpendicular to the first surface and passing through said point.
  • the first and second surfaces 42, 44 taken perpendicular respectively to the first and second directions, have in all respects a radius of curvature typically greater than 25% of the first perimeter.
  • the first and second surfaces 42, 44 each have a curvature sufficiently small that they can be placed close to each other at all points.
  • the first surface 42 is preferably bulged towards the second surface 44, and conversely the second surface 44 is preferably curved towards the first surface 42.
  • the first surface 42 is concave towards the second surface. 44, and vice versa.
  • At least one of the first and second surfaces 42, 44 is flat, and preferably the first and second surfaces 42, 44 are both flat.
  • one of the first and second surfaces 42, 44, taken perpendicular respectively to the first and second directions, has a radius of curvature between 0.5 x (P1 / 2 ⁇ ) and 2 x (P1 / 2 ⁇ ) where P1 is the first perimeter, preferably between 0.75 x (P1 / 2 ⁇ ) and 1.25 x (P1 / 2 ⁇ ).
  • At least one of the first and second surfaces 42, 44 has a pronounced curvature.
  • first and second surfaces 42, 44 both have pronounced radii of curvature close to or substantially equal to each other.
  • one of the two surfaces 42, 44 is concave.
  • the other of the two surfaces is convex, and is engaged in the concave surface.
  • the concave surface and the convex surface are substantially complementary to one another.
  • the first envelope 28 comprises a first peripheral wall 46 which, considered perpendicular to the first direction, completely surrounds the first substrate 22.
  • the second envelope 34 comprises a second peripheral wall 48 which, considered perpendicular to the second direction completely surrounds the second substrate 26.
  • the first and second peripheral walls are distinct from each other. They did not come together with each other. They are tubular.
  • the first peripheral wall 46 comprises a first central section 50 in which the first substrate 22 is housed, and a first downstream end 52 defining the first exhaust gas outlet 32.
  • the first downstream end 52 is integral with the first downstream section 50, and extends the latter in the first direction, towards the volume 40.
  • the second peripheral wall 48 comprises a second central section 54 in which the second substrate 26 is housed, and a second upstream end 56 defining the second inlet 36 of exhaust gas.
  • first and second peripheral walls 46, 48 are entirely separated from each other by at least 75% of the longitudinal length of the first or second peripheral wall.
  • the first peripheral wall is longitudinally shorter than the second peripheral wall, the first and second peripheral walls 46, 48 thus being entirely separated over at least 80% of the longitudinal length of the first peripheral wall.
  • first downstream end 52 of the first peripheral wall is in contact with the second upstream end 56 of the second peripheral wall, but the first and second central sections 50, 54 are entirely separated from each other. They are never in direct contact with each other
  • the gap 58 between the two central sections 50, 54 allows the peripheral walls to expand freely at high temperature.
  • the purification device comprises spacers 60, interposed between the first and second peripheral walls, so as to maintain a spacing between the first and second central sections 50, 54.
  • the spacers 60 may have any suitable shape: metal tab, rod extending parallel to the first and second directions etc.
  • the first central section 50 has, in section perpendicular to the first direction, a shape substantially corresponding to that of the section of the first purification member 22.
  • a gap 62 of substantially constant thickness separates the first substrate 22 of the first central section 50.
  • a mat of a fibrous material 64 is interposed between the first substrate 22 and the first central section 50.
  • This mattress makes it possible to maintain the first substrate 22 radially and axially in position with respect to the first envelope.
  • the second central section 54 has, considered in section perpendicular to the second direction, a shape substantially corresponding to that of the second substrate 26.
  • a mattress 66 is interposed between the second substrate 26 and the second central section 54.
  • the first and second central sections 50, 54 also have respective surfaces 68, 70 facing each other, and separated from each other by the gap 58.
  • one of the surfaces 68, 70 is separated at any point from the other by a distance of less than 10 mm, preferably less than 5 mm.
  • the purification device 1 comprises a single peripheral wall 72 with a closed contour which, considered perpendicular to the first direction, completely surrounds the first and second substrates 22, 26.
  • the single peripheral wall 72 includes a first zone 74 partially surrounding the first substrate 22, and a second zone 76 partially surrounding the second substrate 26.
  • the first and second zones constitute the first and second peripheral walls 46, 48 of the first and second outer envelopes 28, 34.
  • the first purification member 20 comprises a first ply 78 of fibrous material interposed between the first substrate 22 and the single peripheral wall 72.
  • the first ply 78 considered perpendicular to the first direction, completely surrounds the first substrate 22.
  • a zone 80 of this web is interposed between the first substrate 22 and the second substrate 26.
  • the web 78 is provided to retain the first substrate 22 in position relative to the single peripheral wall 72.
  • the second purification member 24 comprises a second ply 82 of fibrous material, interposed between the second substrate 26 and the single peripheral wall 72.
  • the second ply 82 considered perpendicular to the second direction, completely surrounds the second substrate 26.
  • An area 84 of the second web is interposed between the first and second substrates.
  • At least one seal 86 is preferably disposed in contact with both the first fibrous web 78, the second fibrous web 82 and the single peripheral wall 72.
  • two seals 86 are arranged, on both sides of the two substrates, in the same plane as the zones 80 and 84. These seals prevent leakage of exhaust gas between the fibrous material plies and the peripheral wall. They also make it possible to press the first and second plies 78, 82 against the first and second substrates 22, 26, along the edges of these substrates.
  • the seals 86 are typically longitudinal rods made of a fibrous material.
  • the purification device comprises a peripheral layer 88 of fibrous material interposed between the first and second substrates 22, 26 on the one hand and the single peripheral wall 72 on the other hand.
  • the peripheral layer 88 considered perpendicular to the longitudinal direction, completely surrounds the first and second substrates 22, 26.
  • the purification device 1 further comprises an intermediate sheet 90 of fibrous material, interposed between the first and second substrates 22, 26. More specifically, the intermediate sheet 90 is interposed between the first and second surfaces 42, 44. extends over the entire width of the surfaces 42 and 44.
  • the intermediate web 90 divides the volume delimited internally by the peripheral layer 88 in two parts sealed against each other for the exhaust gas.
  • the first substrate 22 is housed in one of the two parts, the second substrate 26 in the other part.
  • the volume 40 is delimited by a lid 92 in the form of a cup, attached directly to the first and second outer shells 28, 34.
  • the cover 92 has a bottom 94 and a peripheral edge 96 with a closed contour projecting from the bottom 94, the peripheral edge 96 being directly attached to the first and second outer shells 28, 34.
  • the lid is not attached to a bezel-shaped piece such as the piece 8 shown on the figure 1 , this being in turn attached to the first and second envelopes 28, 34. Due to the absence of a spectacle-shaped part, it becomes possible to bring the first and second purification members 20, 24 one of them closer together. on the other and thus make the purification device much more compact.
  • the lid is in turn smaller. The disappearance of the bezel, and the fact that the lid is smaller, to lighten the purification device and reduce the thermal inertia of this device. In addition, the number of connections is reduced, which makes it possible to reduce the number of weld seams.
  • the dimensions of the spectacle-shaped part in particular the separation between the inlet and the outlet, are constrained, in the state of the art of the Figures 1 and 2 by providing enough material to form the necks surrounding the inlet and the outlet.
  • the bottom 94 of the lid is flat.
  • the peripheral edge 96 has a tubular shape.
  • the bottom 94 has a more complex shape, for example when an ammonia injection device or an ammonia precursor is mounted on the lid.
  • first and second purification members 20, 24 together define, at a end facing the volume 40, a continuous outer end surface 98, with a closed contour, the peripheral edge 96 of the lid being also continuous, closed contour.
  • the peripheral edge 96 is directly attached to the outer end surface 98.
  • the outer end surface 98 is tubular.
  • the outer end surface 98 is defined by the first downstream end 52 of the first envelope and the second upstream end 56 of the second envelope, without possibly the areas where they are pressed against each other.
  • first downstream end 52 and the second upstream end 56 are part of two walls distinct from each other, the first downstream end 52 and the second upstream end 56 being contiguous to one another so as to define a closed contour continuous surface.
  • the outer end surface 98 corresponds to the end of the single peripheral wall 72 facing the volume 40.
  • the peripheral edge 96 ends, opposite the bottom 94, by a free edge 100 continuous, closed contour, of conjugate shape of that of the outer end surface 98.
  • the free edge 100 is pressed against the outer end surface 98 and rigidly attached thereto, for example welded thereto.
  • the outer end surface 98 is engaged within the free edge 100.
  • the peripheral edge 96 and more precisely its free edge 100, internally delimits an opening 101 having, perpendicular to the first direction, a given surface.
  • the first outlet 32 has a first surface perpendicular to the first direction.
  • the second inlet 36 has a second surface perpendicular to the second direction.
  • the sum of the first and second surfaces is substantially equal to the given area.
  • the free edge 100 has a shape obtained by circulating a generatrix of determined shape, along a closed contour guide curve extending in a plane substantially perpendicular to the longitudinal direction.
  • the generator has for example the shape of a line segment of longitudinal orientation. Alternatively, it has the shape of a line segment slightly inclined with respect to the longitudinal direction.
  • the closed contour guideline can have any kind of shape. It is for example oval with or without bending in the central part, elliptical or any other shape.
  • first downstream end 52 and the second upstream end 56 advantageously have first and second respective sections 102 and 104 pressed against each other. other, as visible on the Figures 5 and 6 .
  • the first and second sections 102, 104 are advantageously straight, that is to say rectilinear. They typically extend parallel to the first and second surfaces 42, 44. If the first perimeter length is referred to as the perimeter length of the first downstream end, and the second perimeter length is the length of the perimeter of the second upstream end, then the first and second sections 102, 104 respectively extend over at least 15% of the first perimeter length and at least 10% of the second perimeter length, respectively.
  • first and second sections 102, 104 respectively extend over at least 20% of the first perimeter length and at least 15% of the second perimeter length respectively.
  • the first and second sections 102, 104 extend longitudinally over less than 25% of the longitudinal length of the first and / or second peripheral walls 46, 48.
  • first downstream end 52 and the second upstream end 56 have, perpendicular to the first and second directions, first and second sections greater than those of the first and second central sections 50, 54.
  • first downstream end 52 projects slightly outwardly of the first purification member relative to the first central section 50, and this over all or substantially all of its periphery.
  • second upstream section 56 projects outwardly from the second purification member relative to the second central section 54, and this over all or substantially all of its periphery.
  • the first downstream section is separated from the first central section by an outgoing shoulder 106.
  • the second upstream end 56 is separated from the second central section 54 by an outgoing shoulder 108.
  • This arrangement makes it possible to create the gap 58 between the central sections 50 and 54.
  • first downstream end 52 and the second upstream end 56 do not participate in the blocking in position of the first and second substrates through the fibrous webs 64 and 66. This maintenance is carried out exclusively at level of the central sections 50 and 54.
  • first and second sections 102, 104 are created at the first downstream end 52 and the second upstream end 56 regardless of the shape of the first and second substrates 22, 26.
  • the first and second substrates 22, 26 are of circular sections, considered perpendicular respectively to the first and second directions.
  • the first and / or second substrate has an oval shape or a race-track type shape, with two substantially flat sides or large radius of curvature, substantially parallel to one another, connected by arcs of smaller radius of curvature.
  • the first central section 50 has a cylindrical shape with circular sections.
  • the first downstream end 52 comprises a portion 110 in an arc of a circle, extending over at least 60% of the periphery of the first downstream end, in addition to the straight section 102.
  • the straight section 102 extends in a substantially tangent plane to the first substrate 22. It is connected to the portion 110 by flanks 112 connecting to the straight section 102 in a direction between the perpendicular to the straight section 102 and the tangent to the portion 110.
  • Straight section 102 is typically formed only at the ends of the canning.
  • the second central section 54 has a cylindrical shape, of circular section adapted to receive the second substrate 26.
  • the second upstream end 56 has an arcuate portion 114, extending over at least 60% of the periphery of the the second upstream end, in addition to the right section 104.
  • the straight section 104 extends in a plane tangential to the second substrate 26.
  • the straight section 104 is connected to the portion 114 by flanks 116 connecting to the straight section 104 in a manner direction between the perpendicular to the section 104 and the tangent to the portion 114.
  • the purification device 1 comprises an outer cover 118 and an inner cone 120 housed in the outer cover 118.
  • the first and second peripheral walls 46, 48 respectively have an upstream first end 122 delimiting the first exhaust gas inlet 30, and a second downstream end 124 delimiting the second exhaust gas outlet 38.
  • the outer cover 118 is of size and shape chosen so as to cover both the first inlet 30 and the second outlet 38. This means that the first upstream end 122 and the second downstream end 124 are fully housed in the outer cover 118. In a variant not shown, the outer cover 118 is housed in the first upstream end 122 and in the second downstream end 124.
  • the inlet 16 and the outlet 18 of exhaust gas are formed in the outer cover 118.
  • the inner cone 120 has an outlet end 126 covering only the first inlet 30, and an inlet end 128 sealingly connected to the inlet 16.
  • the outlet end 126 is housed in the first upstream end 122 or conversely the first upstream end 122 is housed in the outlet end 126.
  • the outer cover 118 has a generally cup-like shape, with a bottom 130 in which the inlet 16 and the outlet 18 are formed, and a side wall 132 extending around the bottom 130, and projecting from one side of the The side wall 132 is of closed contour, and protrudes longitudinally towards the first and second peripheral walls 46, 48.
  • first and second peripheral walls 46, 48 have substantially the same length longitudinally.
  • the first upstream end 122 and the second downstream end 124 thus together define another continuous external surface 134, closed contour, to which the side wall 132 is directly fixed.
  • the inlet 16 and the outlet 18 are delimited by necks 136 and 138 projecting outwardly from the purification device.
  • the necks 136 and 138 protrude from the bottom 130 longitudinally on a side opposite to the side wall 132.
  • the inlet 16 is mechanically connected directly to the upstream equipment 140 ( figure 13 ).
  • the upstream equipment 140 has an exhaust gas outlet 142, possibly extended by an exhaust gas circulation duct.
  • the inlet 16 is mechanically connected either directly to the exhaust gas outlet 142, or directly to the duct.
  • the neck 136 is rigidly fixed to the upstream equipment 140. For example, it is welded to a bicone 143 of the type shown in FIG. figure 16 it is itself connected to the upstream equipment 140, typically by a V-shaped collar.
  • the neck 136 is directly connected to a cone-flange of the upstream equipment 140, typically by a V-shaped collar. represented on the figure 13 the inlet 16 is fixed to the upstream equipment 140 by means of a flange 144.
  • At least the outer cover 118 is mechanically connected directly to the upstream equipment 140.
  • the internal cone 120 is mechanically connected to the upstream equipment 140 only via the outer cover 118, typically by its inlet end 128. This situation is represented on the Figures 12 to 15 .
  • the stresses and stresses transmitted between the purification device and the upstream equipment 140 are transmitted mainly through the outer cover 118. These efforts pass especially, or even exclusively, through the connection between the outer cover 118 and the upstream equipment 140.
  • the outer cover 118 is made of a relatively thicker material, for example of thickness between 1 mm and 2 mm.
  • the cover 118 is for example made of stainless steel, for example in 1.4509, 1.4510, 1.4512 or 1.4301.
  • the internal cone 120 because it does not take up effort, is made of a relatively less thick material than the outer cover 118, for example of thickness between 0.5 mm and 1 mm.
  • the inner cone 120 is made of stainless steel, for example 1.4509, 1.4510 or 1.4301.
  • the inner cone 120 is connected to the upstream equipment 140 with the outer cover 118.
  • a single link 145 doubles, secures the inner cone 120 and the outer cover 118 to the upstream equipment 140.
  • This single link 145 is for example a weld. In the example shown, it secures the inner cone 120 and the outer cover to the bicone 143, the latter being connected to the upstream equipment 140.
  • the outer cover 118 is made of a relatively thicker material, most of the effort will be transmitted between the purification device and the upstream equipment 140 via the outer cover 118. It is thus possible to realize the inner cone 120 in a relatively less thick material.
  • the materials and the thicknesses of the outer cover 118 and the inner cone 120 are typically those described by the first embodiment.
  • the inner cone 120 has a section widening from the inlet end 128 to the outlet end 126.
  • the outlet end 126 is rigidly attached, in a sealed manner, to the first end upstream 122. It has for example an inner section complementary to the outer section of the first upstream end 122, the first upstream end 122 being engaged in the outlet end 126 of the inner cone.
  • the inlet end 128 of the inner cone is engaged in the neck 136. It is rigidly fixed to the neck 136 by any suitable means. Typically, the inlet end 128 has an outer section of complementary shape to the inner section of the neck 136. It is fixed for example by a weld line (not shown) to the inner surface of the neck 136. Alternatively, it is fitted without play, which contributes to the absence of force transmission through the internal cone.
  • the inner cone 120 and the outer cover 118 delimit between them a space 146 extending over the entire periphery of the inner cone 120 and fluidly communicating with the outlet 18.
  • the exhaust gases leaving the second purification member 24 by the second outlet 38 will circulate around the internal cone 120, in the space 146, before being discharged through the outlet 18.
  • the arrangement described above has many advantages.
  • Making the inner cone 120 of a thin material reduces the weight and thermal inertia of the purification device.
  • space 146 allows the circulation of exhaust gas leaving the second purification member around the inner cone 120, allows a rapid temperature rise of the inner cone 120, since this cone is exposed to the exhaust gas both by its inner surface and by its outer surface.
  • this temperature is reached faster.
  • the first and second substrates may be of any type suitable for the purification of the exhaust gases.
  • the first substrate is a three-way catalyst and the second substrate is another three-way catalyst, or a particulate filter.
  • the first substrate is for example an oxidation catalyst, and the second substrate is for example a particulate filter.
  • the first substrate is a PNA (Passive NOx Absorber, or passive NOx absorber) or a NOx trap (LNT Lean Nox Trap)
  • the second substrate is a particulate filter, or is a SCR type catalyst (Selective Catalytic reduction or selective catalytic reduction) or a catalytic filter SCRF type (Selective Catalytic Reduction Filter or selective catalytic reduction filter), or a SCRF type catalyst filter followed by a catalyst SCR type.
  • a mixing device is provided in the volume 40, preferably.
  • the purification device comprises a device for injecting a nitrogen oxide reducing product such as ammonia or an ammonia precursor, arranged to perform the injection upstream of the mixing device.
  • a nitrogen oxide reducing product such as ammonia or an ammonia precursor
  • the injection is typically carried out in volume 40.
  • the injected product is for example the product sold under the trade name Adblue, or an aqueous solution of urea, or else ammonia gas (ASDS technology).
  • first and second substrates 22, 26 do not necessarily occupy all the volume delimited internally by the first and second envelopes. As illustrated on the figure 15 one and / or the other of the substrates may occupy only a part of the longitudinal length of the first and / or the second envelope.
  • the free volume is then likely to be used for the implantation of a device for injecting a nitrogen oxide reducing product, or a mixer, or any other suitable device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Le dispositif de purification (1) comprend : - un premier organe de purification (20) comprenant une première enveloppe externe (28) ; - un second organe de purification (24) comprenant une seconde enveloppe externe (34), les premier et second organes de purification (20, 24) étant disposés côte-à-côte et sensiblement parallèlement l'un à l'autre ; - un volume (40) raccordant fluidiquement la première sortie (32) à la seconde entrée (36). Le volume (40) est délimité par un couvercle (92) en forme de coupelle rapporté directement sur les première et seconde enveloppes externes (28, 34).The purification device (1) comprises: - a first purification member (20) comprising a first outer casing (28); a second purification member (24) comprising a second outer envelope (34), the first and second purification members (20, 24) being arranged side by side and substantially parallel to each other; a volume (40) fluidly connecting the first output (32) to the second input (36). The volume (40) is delimited by a cup-shaped lid (92) attached directly to the first and second outer shells (28, 34).

Description

L'invention concerne en générale les dispositifs de purification des gaz d'échappement.The invention generally relates to exhaust gas purification devices.

Plus précisément, l'invention concerne un dispositif de purification des gaz d'échappement d'un véhicule, le dispositif de purification comprenant :

  • un premier organe de purification comprenant une première enveloppe externe délimitant une première entrée de gaz d'échappement et une première sortie de gaz d'échappement, et un premier substrat de purification des gaz d'échappement logé dans la première enveloppe, les gaz d'échappement circulant suivant une première direction dans le premier substrat ;
  • un second organe de purification comprenant une seconde enveloppe externe délimitant une seconde entrée de gaz d'échappement et une seconde sortie de gaz d'échappement, et un second substrat de purification des gaz d'échappement logé dans la seconde enveloppe, les gaz d'échappement circulant dans le second substrat suivant une seconde direction opposée à la première direction, les premier et second organes de purification étant disposés côte-à-côte et sensiblement parallèlement l'un à l'autre ; et
  • un volume raccordant fluidiquement la première sortie à la seconde entrée.
More specifically, the invention relates to a device for purifying the exhaust gas of a vehicle, the purification device comprising:
  • a first purification member comprising a first outer envelope delimiting a first exhaust gas inlet and a first exhaust gas outlet, and a first exhaust gas purification substrate housed in the first shell, the gases of exhaust flowing in a first direction in the first substrate;
  • a second purification member comprising a second outer envelope delimiting a second exhaust gas inlet and a second exhaust gas outlet, and a second exhaust gas purification substrate housed in the second shell, the gases of exhaust flowing in the second substrate in a second direction opposite to the first direction, the first and second purification members being disposed side-by-side and substantially parallel to each other; and
  • a volume fluidly connecting the first output to the second input.

De tels dispositifs de purification avec une architecture en U sont fréquemment utilisés à bord de véhicules équipés de moteurs à sortie vers l'arrière. Ils sont placés dans le compartiment moteur.Such purification devices with a U-shaped architecture are frequently used in vehicles with rear-exit engines. They are placed in the engine compartment.

Les figures 1 et 2 représentent un dispositif de purification en U conforme à l'état de la technique. Les premier et second substrats 2 et 4 sont des blocs cylindriques ayant, perpendiculairement aux première et seconde directions, des sections circulaires. La sortie du premier organe de purification est raccordée à l'entrée du second organe de purification par un volume 6, formé d'une lunette 8 et d'un couvercle 10. La lunette 8 est une plaque comportant deux orifices 12, 14 de sections circulaires, auxquels sont fixés les premier et second organes de purification. Les orifices 12 et 14 sont délimités par des cols, visible sur la figure 1.The Figures 1 and 2 represent a U-shaped purification device according to the state of the art. The first and second substrates 2 and 4 are cylindrical blocks having, perpendicular to the first and second directions, circular sections. The outlet of the first purification member is connected to the inlet of the second purification member by a volume 6, formed of a bezel 8 and a cover 10. The bezel 8 is a plate having two orifices 12, 14 of sections circular, to which the first and second purification members are attached. The orifices 12 and 14 are delimited by collars, visible on the figure 1 .

L'entrée du premier organe de purification est définie par un couvercle d'entrée 15, visible sur la figure 1.The inlet of the first purification member is defined by an inlet cover 15, visible on the figure 1 .

Les contraintes sur l'encombrement des éléments placés à proximité du bloc moteur sont de plus en plus sévères. Dans ce contexte, l'invention vise à proposer un dispositif de purification qui soit plus compact.The constraints on the size of the elements placed near the engine block are becoming more severe. In this context, the invention aims to provide a purification device which is more compact.

A cette fin, l'invention porte sur un dispositif de purification du type précité, caractérisé en ce que le volume est délimité par un couvercle en forme de coupelle rapporté directement sur les première et seconde enveloppes externes.To this end, the invention relates to a purification device of the aforementioned type, characterized in that the volume is delimited by a cup-shaped lid attached directly to the first and second outer shells.

On entend ici par directement fixé ou rapporté le fait que le couvercle ne soit pas fixé à une pièce en forme de lunette telle que la pièce 8 représentée sur la figure 1, celle-ci étant à son tour fixée aux première et seconde enveloppes 28, 34. Du fait de l'absence de pièce en forme de lunette, il devient possible de rapprocher considérablement les premier et second organes de purification 20, 24 l'un de l'autre et ainsi de rendre le dispositif de purification beaucoup plus compact. Le couvercle est à son tour plus petit. La disparition de la lunette, et le fait que le couvercle soit plus petit, permettant d'alléger le dispositif de purification et de diminuer l'inertie thermique de ce dispositif. Par ailleurs, le nombre de liaisons est réduit, ce qui permet de diminuer le nombre de cordons de soudure.Here is meant by directly attached or reported the fact that the lid is not attached to a bezel-shaped piece such as the piece 8 shown on the figure 1 , this being in turn attached to the first and second envelopes 28, 34. Due to the absence of a spectacle-shaped part, it becomes possible to bring the first and second purification members 20, 24 one of them closer together. on the other and thus make the purification device much more compact. The lid is in turn smaller. The disappearance of the bezel, and the fact that the lid is smaller, to lighten the purification device and reduce the thermal inertia of this device. In addition, the number of connections is reduced, which makes it possible to reduce the number of weld seams.

Les dimensions de la pièce en forme de lunette, notamment l'écartement entre l'entrée et la sortie, sont contraintes, dans l'état de la technique des figures 1 et 2, par le fait qu'il faut prévoir suffisamment de matière pour former les cols entourant l'entrée et la sortie.The dimensions of the spectacle-shaped part, in particular the separation between the inlet and the outlet, are constrained, in the state of the art of the Figures 1 and 2 by providing enough material to form the necks surrounding the inlet and the outlet.

Le dispositif de purification peut également présenter une ou plusieurs des caractéristiques ci-dessous, considéré(es) individuellement ou selon toutes les combinaisons techniquement possibles :

  • le couvercle comporte un fond et un bord périphérique à contour fermé en saillie par rapport au fond, le bord périphérique ayant un bord libre directement fixé aux première et seconde enveloppes externes ;
  • le bord libre présente une forme obtenue en faisant circuler une génératrice le long d'une courbe directrice à contour fermé, la génératrice étant sensiblement parallèle aux première et seconde directions, la courbe directrice s'étendant dans un plan perpendiculaire aux première et seconde directions ;
  • le bord libre délimite intérieurement une ouverture ayant perpendiculairement à la première direction une surface donnée, la première sortie ayant perpendiculairement à la première direction une première surface, la seconde entrée ayant perpendiculairement à la seconde direction une seconde surface, la somme des première et seconde surfaces étant sensiblement égale à la surface donnée ;
  • les premier et second organes de purification définissent ensemble vers le volume une surface d'extrémité externe continue à contour fermé, le bord libre étant de forme conjuguée de celle de la surface externe ;
  • la surface d'extrémité externe est de forme tubulaire ;
  • la première enveloppe comprend une première paroi périphérique ayant un premier tronçon central qui entoure le premier substrat et une première extrémité aval prolongeant le premier tronçon central vers le volume ;
  • la seconde enveloppe comprend une seconde paroi périphérique ayant un second tronçon central qui entoure le second substrat et une seconde extrémité amont prolongeant le second tronçon central vers le volume ;
  • la première extrémité aval et la seconde extrémité amont définissant ensemble la surface d'extrémité ;
  • le couvercle est venu de matière ;
  • la première enveloppe comprend une première paroi périphérique qui, considérée perpendiculairement à la première direction, entoure entièrement le premier substrat ;
  • la seconde enveloppe comprend une seconde paroi périphérique qui, considérée perpendiculairement à la seconde direction, entoure entièrement le second substrat ;
  • les première et seconde parois périphériques étant distinctes l'une de l'autre et ayant respectivement une première extrémité aval et une seconde extrémité amont délimitant la première sortie et la seconde entrée ;
  • la première extrémité aval et la seconde extrémité amont ayant des premier et second tronçons respectifs plaqués l'un contre l'autre ;
  • les premier et second tronçons sont droits ;
  • la première extrémité aval et la seconde extrémité amont ont des première et seconde longueurs périmétriques respectives, les premier et second tronçons s'étendant respectivement sur au moins 15% de la première longueur périmétrique et sur au moins 10% de la seconde longueur périmétrique ;
  • les première et seconde parois périphériques ont des premier et second tronçons centraux respectifs situés à distance de la première extrémité aval et de la seconde extrémité amont suivant les première et seconde directions, la première extrémité aval et la seconde extrémité amont ayant perpendiculairement aux première et seconde directions des première et seconde sections respectivement supérieures à celles des premier et second tronçons centraux ;
  • le dispositif de purification comporte une paroi périphérique unique à contour fermé qui, considérée perpendiculairement à la première direction, entoure entièrement les premier et second substrats ; et
  • la paroi périphérique unique présente une extrémité délimitant à la fois la première sortie et la seconde entrée, le couvercle étant directement fixé à ladite extrémité.
The purification device may also have one or more of the following characteristics considered individually or in any technically possible combination:
  • the cover has a bottom and a peripheral edge with a closed contour projecting from the bottom, the peripheral edge having a free edge directly fixed to the first and second outer shells;
  • the free edge has a shape obtained by circulating a generator along a closed contour guide curve, the generatrix being substantially parallel to the first and second directions, the guide curve extending in a plane perpendicular to the first and second directions;
  • the free edge internally delimits an opening having a given surface perpendicular to the first direction, the first outlet having a first surface perpendicular to the first direction, the second input having a second surface perpendicular to the second direction, the sum of the first and second surfaces; being substantially equal to the given surface;
  • the first and second purification members together define a closed-edge continuous outer end surface towards the volume, the free edge being of conjugate shape with that of the outer surface;
  • the outer end surface is of tubular form;
  • the first envelope comprises a first peripheral wall having a first central portion surrounding the first substrate and a first downstream end extending the first central portion to the volume;
  • the second envelope comprises a second peripheral wall having a second central section surrounding the second substrate and a second upstream end extending the second central section towards the volume;
  • the first downstream end and the second upstream end defining together the end surface;
  • the lid came from matter;
  • the first envelope comprises a first peripheral wall which, considered perpendicular to the first direction, completely surrounds the first substrate;
  • the second envelope comprises a second peripheral wall which, considered perpendicular to the second direction, completely surrounds the second substrate;
  • the first and second peripheral walls being separate from one another and having respectively a first downstream end and a second upstream end delimiting the first output and the second input;
  • the first downstream end and the second upstream end having first and second respective sections pressed against each other;
  • the first and second sections are straight;
  • the first downstream end and the second upstream end have respective first and second perimeter lengths, the first and second sections respectively extending over at least 15% of the first perimeter length and at least 10% of the second perimeter length;
  • the first and second peripheral walls have respective first and second central sections located at a distance from the first downstream end and the second upstream end along the first and second directions, the first downstream end and the second upstream end having perpendicular to the first and second ends; directions of the first and second sections respectively greater than those of the first and second central sections;
  • the purification device comprises a single peripheral wall with a closed contour which, considered perpendicular to the first direction, completely surrounds the first and second substrates; and
  • the single peripheral wall has an end delimiting both the first output and the second input, the cover being directly attached to said end.

Selon un autre aspect, l'invention porte sur une ligne d'échappement comportant un dispositif de purification ayant les caractéristiques ci-dessus.According to another aspect, the invention relates to an exhaust line comprising a purification device having the above characteristics.

D'autres caractéristiques et avantages de l'invention ressortiront de la description détaillée qui en est donnée ci-dessous, à titre indicatif et nullement limitatif, en référence aux figures annexées, parmi lesquelles :

  • la figure 1 est une représentation schématique en coupe, d'un dispositif de purification conforme à l'état de la technique ;
  • la figure 2 est une vue de face du dispositif de purification de la figure 1, le couvercle n'étant pas représenté pour laisser apparaitre la lunette ;
  • la figure 3 est une vue en perspective d'un dispositif conforme à un premier mode de réalisation de l'invention ;
  • la figure 4 est une vue partielle en coupe du dispositif de la figure 3 ;
  • la figure 5 est une vue partielle, en perspective, du dispositif de la figure 3, le couvercle n'étant pas représenté ;
  • la figure 6 est une vue de face, par l'arrière, du dispositif de la figure 3, les couvercles définissant l'entrée et la sortie du dispositif n'étant pas représentés ;
  • la figure 7 est une vue de face, similaire à celle de la figure 6, d'un dispositif de purification conforme à un second mode de réalisation de l'invention ;
  • la figure 8 est une vue agrandie d'une zone d'un dispositif de purification conforme à une variante du second mode de réalisation ;
  • la figure 9 est une vue similaire à celle de la figure 8 pour une autre variante de réalisation du second mode de réalisation de l'invention ;
  • la figure 10 et la figure 11 sont des vues de face illustrant un autre aspect de l'invention ;
  • la figure 12 est une vue en perspective d'un dispositif de purification illustrant encore un autre aspect de l'invention ;
  • la figure 13 est une vue en coupe, partielle, du dispositif de purification de la figure 12,
  • la figure 14 est une vue en perspective, similaire à la figure 12, le couvercle externe n'étant pas représenté pour laisser apparaitre le cône interne ;
  • la figure 15 est une vue de côté du dispositif de purification de la figure 12 avec une coupe partielle ; et
  • la figure 16 est une vue agrandie d'un détail de la figure 13, illustrant une variante de réalisation de l'invention.
Other features and advantages of the invention will become apparent from the detailed description given below, for information only and in no way limitative, with reference to the appended figures, among which:
  • the figure 1 is a schematic sectional representation of a purification device according to the state of the art;
  • the figure 2 is a front view of the purification device of the figure 1 the lid is not shown to reveal the bezel;
  • the figure 3 is a perspective view of a device according to a first embodiment of the invention;
  • the figure 4 is a partial sectional view of the device of the figure 3 ;
  • the figure 5 is a partial view, in perspective, of the device of the figure 3 the lid is not shown;
  • the figure 6 is a front view, from the back, of the device of the figure 3 , the covers defining the input and the output of the device not being represented;
  • the figure 7 is a front view, similar to that of the figure 6 , a purification device according to a second embodiment of the invention;
  • the figure 8 is an enlarged view of an area of a purification device according to a variant of the second embodiment;
  • the figure 9 is a view similar to that of the figure 8 for another variant embodiment of the second embodiment of the invention;
  • the figure 10 and the figure 11 are front views illustrating another aspect of the invention;
  • the figure 12 is a perspective view of a purification device illustrating yet another aspect of the invention;
  • the figure 13 is a partial sectional view of the purification device of the figure 12 ,
  • the figure 14 is a perspective view, similar to the figure 12 the outer cover is not shown to reveal the inner cone;
  • the figure 15 is a side view of the purification device of the figure 12 with partial cut; and
  • the figure 16 is an enlarged view of a detail of the figure 13 , illustrating an alternative embodiment of the invention.

Le dispositif 1 représenté sur la figure 3 est destiné à la purification des gaz d'échappement d'un véhicule, typiquement d'un véhicule automobile équipé d'un moteur thermique tel qu'une voiture ou un camion. Le dispositif de purification 1 est destiné à être intégré dans une ligne d'échappement. Il est raccordé vers l'amont à un collecteur captant les gaz d'échappement sortant des chambres de combustion du moteur thermique, et vers l'aval à une canule permettant de relarguer les gaz d'échappement purifié dans l'atmosphère. Le collecteur et la canule ne sont pas représentés. D'autres équipements sont généralement interposés entre le dispositif de purification et le collecteur, par exemple un turbo compresseur. Encore d'autres équipements, tels que des silencieux, sont interposés entre le dispositif de purification et la canule.The device 1 represented on the figure 3 is intended for the purification of the exhaust gases of a vehicle, typically of a motor vehicle equipped with an engine thermal such as a car or a truck. The purification device 1 is intended to be integrated in an exhaust line. It is connected upstream to a collector sensing the exhaust gas leaving the combustion chambers of the engine, and downstream to a cannula for releasing purified exhaust gas into the atmosphere. The collector and the cannula are not represented. Other equipment is generally interposed between the purification device and the collector, for example a turbo compressor. Still other equipment, such as silencers, are interposed between the purification device and the cannula.

Le dispositif de purification 1 comporte une entrée de gaz d'échappement 16, communiquant fluidiquement avec la partie amont de la ligne d'échappement, et une sortie de gaz d'échappement 18, communiquant fluidiquement avec la partie aval de la ligne d'échappement.The purification device 1 comprises an exhaust gas inlet 16, fluidly communicating with the upstream part of the exhaust line, and an exhaust gas outlet 18, fluidly communicating with the downstream part of the exhaust line. .

L'amont et l'aval sont entendus ici relativement au sens de circulation normal des gaz d'échappement.Upstream and downstream are meant here relative to the direction of normal exhaust gas flow.

Le dispositif de purification comprend :

  • un premier organe de purification 20, comportant un premier substrat de purification des gaz d'échappement 22 (figure 4), les gaz d'échappement circulant dans le premier substrat 22 selon une première direction D1 représentée sur la figure 4 ;
  • un second organe de purification 24, comportant un second substrat 26 de purification des gaz d'échappement, les gaz d'échappement circulant dans le second substrat selon une seconde direction D2 (figure 4) sensiblement opposée à la première direction.
The purification device comprises:
  • a first purification unit 20, comprising a first exhaust purification substrate 22 ( figure 4 ), the exhaust gas flowing in the first substrate 22 in a first direction D1 shown in FIG. figure 4 ;
  • a second purification unit 24, comprising a second exhaust gas purification substrate 26, the exhaust gases flowing in the second substrate in a second direction D2 ( figure 4 ) substantially opposite the first direction.

Les première et seconde directions D1, D2 sont parallèles et opposées l'une à l'autre. En variante, elles sont légèrement inclinées l'une par rapport à l'autre.The first and second directions D1, D2 are parallel and opposite to each other. Alternatively, they are slightly inclined relative to each other.

Dans la description qui va suivre, on appellera direction longitudinale une direction parallèle, ou sensiblement parallèle, aux première et seconde directions.In the following description, the longitudinal direction will be called a direction parallel to, or substantially parallel to, the first and second directions.

Le premier organe de purification 20 comporte encore une première enveloppe externe 28 délimitant une première entrée 30 de gaz d'échappement dans le premier organe de purification, et une première sortie 32 de gaz d'échappement hors du premier organe de purification.The first purification member 20 further comprises a first outer casing 28 delimiting a first exhaust gas inlet 30 in the first purification unit, and a first exhaust gas outlet 32 out of the first purification unit.

De même, le second organe de purification 24 comprend une seconde enveloppe externe 34 délimitant une seconde entrée de gaz d'échappement 36 à l'intérieur du second organe de purification, et une seconde sortie 38 de gaz d'échappement hors du second organe de purification.Similarly, the second purification member 24 comprises a second outer envelope 34 delimiting a second exhaust gas inlet 36 inside the second purification member, and a second exhaust outlet 38 out of the second purification.

Les premier et second substrats 22, 26 sont logés à l'intérieur des première et seconde enveloppes 28, 34 respectivement.The first and second substrates 22, 26 are housed inside the first and second envelopes 28, 34 respectively.

Le dispositif de purification 1 comporte encore un volume 40, raccordant fluidiquement la première sortie 32 à la seconde entrée 36.The purification device 1 further comprises a volume 40, fluidly connecting the first outlet 32 to the second inlet 36.

Comme visible sur les figures, les premier et second organes de purification 20, 24 sont disposés côte à côte et sensiblement parallèlement l'un à l'autre. On entend par là que les premier et second organes de purification présentent des axes centraux respectifs parallèles l'un à l'autre, ces axes centraux étant typiquement longitudinaux, c'est-à-dire parallèles aux première et seconde directions.As shown in the figures, the first and second purification members 20, 24 are arranged side by side and substantially parallel to each other. By this is meant that the first and second purification members have respective central axes parallel to one another, these central axes being typically longitudinal, that is to say parallel to the first and second directions.

L'axe central du premier organe de purification est défini comme l'axe passant par les centres de toutes les sections droites du premier organe de purification, ces sections droites étant en prises perpendiculairement à la première direction. De même, l'axe central du second organe de purification correspond à l'axe passant par les centres de toutes les sections droites du second organe de purification, ces sections droites étant prises perpendiculairement à la seconde direction.The central axis of the first purification member is defined as the axis passing through the centers of all the straight sections of the first purification member, these straight sections being taken perpendicularly to the first direction. Similarly, the central axis of the second purification member corresponds to the axis passing through the centers of all the straight sections of the second purification member, these straight sections being taken perpendicularly to the second direction.

Les premier et second organes de purification sont disposés côte à côte, au sens où des première et seconde surfaces respectives 42, 44 des premier et second substrats 22, 26 sont placés en vis-à-vis l'une de l'autre, c'est-à-dire l'une face à l'autre.The first and second purification members are arranged side by side, in the sense that first and second respective surfaces 42, 44 of the first and second substrates 22, 26 are placed facing each other, c that is to say one face to the other.

Selon un aspect de l'invention, le premier substrat 22 présente, perpendiculairement à la première direction, une première section ayant un premier périmètre, la première surface 42 présentant, perpendiculairement à la première direction, une première largeur comprise entre 7% et 50 % du premier périmètre.According to one aspect of the invention, the first substrate 22 has, perpendicular to the first direction, a first section having a first perimeter, the first surface 42 having, perpendicular to the first direction, a first width of between 7% and 50% the first perimeter.

Par ailleurs, le second substrat 26 présente perpendiculairement à la seconde direction une seconde section ayant un second périmètre, la seconde surface 44 présentant, perpendiculairement à la seconde direction, une seconde largeur comprise entre 7% et 50 % du second périmètre.On the other hand, the second substrate 26 has perpendicularly to the second direction a second section having a second perimeter, the second surface 44 having, perpendicular to the second direction, a second width of between 7% and 50% of the second perimeter.

Quand le premier substrat 22 a une section droite constante perpendiculairement à la première direction, le premier périmètre correspond au périmètre de ladite section.When the first substrate 22 has a constant cross section perpendicular to the first direction, the first perimeter corresponds to the perimeter of said section.

De même, le second substrat présente typiquement une section droite constante le long de la seconde direction. Dans ce cas, le second périmètre correspond au périmètre de cette section droite.Likewise, the second substrate typically has a constant cross-section along the second direction. In this case, the second perimeter corresponds to the perimeter of this cross-section.

Il est possible également que le second substrat présente des sections droites qui varient légèrement le long de la seconde direction. Dans ce cas, on considère comme second périmètre la moyenne des périmètres de toutes les sections droites du second substrat.It is also possible that the second substrate has straight sections that vary slightly along the second direction. In this case, the second perimeter is the average of the perimeters of all the straight sections of the second substrate.

La première largeur correspond à la largeur de la première surface 42 prise perpendiculairement à la première direction.The first width corresponds to the width of the first surface 42 taken perpendicular to the first direction.

La première largeur est prise en suivant le périmètre du premier substrat 22.The first width is taken along the perimeter of the first substrate 22.

De même, la seconde largeur correspond à la largeur de la seconde surface 44 prise perpendiculairement à la seconde direction, en suivant le périmètre du second substrat 26.Similarly, the second width corresponds to the width of the second surface 44 taken perpendicular to the second direction, following the perimeter of the second substrate 26.

La première largeur est supérieure à 7% du premier périmètre, de préférence supérieure à 10% du premier périmètre, et encore de préférence supérieure à 15% du premier périmètre. Elle est inférieure à 50 % du premier périmètre ce qui veut dire que le premier substrat 22 n'est pas logé entièrement dans le second substrat 26, mais est placé à côté de celui-ci.The first width is greater than 7% of the first perimeter, preferably greater than 10% of the first perimeter, and even more preferably greater than 15% of the first perimeter. It is less than 50% of the first perimeter, which means that the first substrate 22 is not entirely housed in the second substrate 26, but is placed next to it.

De même, la seconde largeur est supérieure à 7% du second périmètre, de préférence supérieure à 10% du second périmètre et encore de préférence supérieure à 15% du second périmètre. Elle est inférieure à 50 % du second périmètre, ce qui veut dire que le second substrat 26 n'est pas logé entièrement dans le premier substrat 22.Similarly, the second width is greater than 7% of the second perimeter, preferably greater than 10% of the second perimeter and more preferably greater than 15% of the second perimeter. It is less than 50% of the second perimeter, which means that the second substrate 26 is not entirely housed in the first substrate 22.

La première surface 42 présente par exemple une largeur constante quand on suit ladite surface 42 selon la première direction. La première largeur correspond alors à ladite largeur. En variante, la première surface présente une largeur variable quand on suite la première surface parallèlement à la première direction. On choisit alors comme première largeur la moyenne des largeurs de la première surface considérée en section perpendiculaire à la première direction.The first surface 42 has for example a constant width when following said surface 42 in the first direction. The first width then corresponds to said width. Alternatively, the first surface has a variable width when following the first surface parallel to the first direction. The width of the first surface considered in section perpendicular to the first direction is then chosen as the first width.

De même, la seconde surface 44 peut présenter une largeur constante quand on la suit selon la seconde direction, ladite largeur correspondant alors à la seconde largeur. En variante, la seconde surface présente des largeurs variables quand on la suit selon la seconde direction. On considère alors comme seconde largeur la moyenne des largeurs de la seconde surface considérée en section perpendiculairement à la seconde direction.Similarly, the second surface 44 may have a constant width when it follows in the second direction, said width then corresponding to the second width. Alternatively, the second surface has variable widths when followed in the second direction. The second width is then considered as the average of the widths of the second surface considered in section perpendicular to the second direction.

Les première et seconde surfaces 42, 44 ont des formes respectives co-adaptées de telle sorte qu'au moins l'une des première et seconde surfaces 42, 44 est séparée en tout point de l'autre des première et seconde surfaces 42, 44 par une distance inférieure à 30 mm, de préférence inférieure à 25 mm, soit une distance entre les enveloppes 28 et 34 inférieure à 10mm, de préférence inférieure à 5mm.The first and second surfaces 42, 44 have respective shapes co-adapted such that at least one of the first and second surfaces 42, 44 is separated at all points from the other of the first and second surfaces 42, 44 by a distance less than 30 mm, preferably less than 25 mm, a distance between the envelopes 28 and 34 less than 10 mm, preferably less than 5 mm.

Les première et seconde surfaces 42, 44 s'étendent longitudinalement sensiblement sur toute la longueur respectivement des premier et second substrats 22, 26.The first and second surfaces 42, 44 extend longitudinally substantially the entire length respectively of the first and second substrates 22, 26.

Ainsi, dans l'exemple représenté sur les figures 3 et 4, chaque point de la première surface 42 est placé en vis-à-vis d'un point de la seconde surface 44, mais l'inverse n'est pas vrai, du fait que le premier substrat 22 est plus court que le second substrat 26.Thus, in the example shown on the figures 3 and 4 each point of the first surface 42 is placed opposite a point of the second surface 44, but the opposite is not true, because the first substrate 22 is shorter than the second substrate 26.

En variante, le second substrat 26 est plus court que le premier substrat 22, chaque point de la seconde surface étant ainsi placé en vis-à-vis d'un point de la première surface.Alternatively, the second substrate 26 is shorter than the first substrate 22, each point of the second surface thus being placed opposite a point of the first surface.

Selon encore un autre exemple de réalisation, les premier et second substrats sont de mêmes longueurs, chaque point de la première surface étant ainsi placé en vis-à-vis d'un point de la seconde surface.According to yet another embodiment, the first and second substrates are of the same length, each point of the first surface thus being placed opposite a point of the second surface.

La distance d'un point de la première surface 42 à la seconde surface est prise en considérant une direction perpendiculaire à la première surface et passant par ledit point.The distance from one point of the first surface 42 to the second surface is taken by considering a direction perpendicular to the first surface and passing through said point.

Dans un exemple de réalisation représenté sur les figures 3 à 8, les première et seconde surfaces 42, 44 prises perpendiculairement respectivement aux première et seconde directions, ont en tout point un rayon de courbure supérieur typiquement à 25% du premier périmètre. En d'autres termes, les première et seconde surfaces 42, 44 présentent chacune une courbure suffisamment faible pour qu'elles puissent être placées à proximité l'une de l'autre en tout point.In an exemplary embodiment shown on the Figures 3 to 8 , the first and second surfaces 42, 44 taken perpendicular respectively to the first and second directions, have in all respects a radius of curvature typically greater than 25% of the first perimeter. In other words, the first and second surfaces 42, 44 each have a curvature sufficiently small that they can be placed close to each other at all points.

Dans ce cas, la première surface 42 est de préférence bombée vers la seconde surface 44, et inversement la seconde surface 44 est de préférence bombée vers la première surface 42. Toutefois, il est envisageable que la première surface 42 soit concave vers la seconde surface 44, et inversement.In this case, the first surface 42 is preferably bulged towards the second surface 44, and conversely the second surface 44 is preferably curved towards the first surface 42. However, it is conceivable that the first surface 42 is concave towards the second surface. 44, and vice versa.

Selon une autre variante non représentée, au moins l'une des première et seconde surfaces 42, 44 est plane, et de préférence les première et seconde surfaces 42, 44 sont planes toutes deux.According to another variant not shown, at least one of the first and second surfaces 42, 44 is flat, and preferably the first and second surfaces 42, 44 are both flat.

Selon une variante de réalisation représentée sur la figure 9, l'une des première et seconde surfaces 42, 44, prise perpendiculairement respectivement aux première et seconde directions, présente un rayon de courbure compris entre 0,5 x (P1/2π) et 2 x (P1/2π) où P1 est le premier périmètre, de préférence compris entre 0,75 x (P1/2π) et 1,25 x (P1/2π).According to an alternative embodiment represented on the figure 9 one of the first and second surfaces 42, 44, taken perpendicular respectively to the first and second directions, has a radius of curvature between 0.5 x (P1 / 2π) and 2 x (P1 / 2π) where P1 is the first perimeter, preferably between 0.75 x (P1 / 2π) and 1.25 x (P1 / 2π).

En d'autres termes, au moins l'une des première et seconde surfaces 42, 44 présente une courbure prononcée.In other words, at least one of the first and second surfaces 42, 44 has a pronounced curvature.

Typiquement, et comme illustré sur la figure 9, les première et seconde surfaces 42, 44 présentent toutes les deux des rayons de courbure prononcés, proches ou sensiblement égaux l'un à l'autre.Typically, and as illustrated on the figure 9 the first and second surfaces 42, 44 both have pronounced radii of curvature close to or substantially equal to each other.

Dans ce cas, et comme illustré sur la figure 9, l'une des deux surfaces 42, 44 est concave. L'autre des deux surfaces est convexe, et est engagée dans la surface concave. La surface concave et la surface convexe sont sensiblement complémentaires l'une de l'autre.In this case, and as shown on the figure 9 one of the two surfaces 42, 44 is concave. The other of the two surfaces is convex, and is engaged in the concave surface. The concave surface and the convex surface are substantially complementary to one another.

Dans l'exemple de réalisation illustré sur la figure 5, la première enveloppe 28 comprend une première paroi périphérique 46 qui, considérée perpendiculairement à la première direction, entoure entièrement le premier substrat 22. De même, la seconde enveloppe 34 comprend une seconde paroi périphérique 48 qui, considérée perpendiculairement à la seconde direction entoure entièrement le second substrat 26. Les première et seconde parois périphériques sont distinctes l'une de l'autre. Elles ne sont pas venues de matière l'une avec l'autre. Elles sont tubulaires.In the exemplary embodiment illustrated on the figure 5 , the first envelope 28 comprises a first peripheral wall 46 which, considered perpendicular to the first direction, completely surrounds the first substrate 22. Similarly, the second envelope 34 comprises a second peripheral wall 48 which, considered perpendicular to the second direction completely surrounds the second substrate 26. The first and second peripheral walls are distinct from each other. They did not come together with each other. They are tubular.

Plus précisément, la première paroi périphérique 46 comporte un premier tronçon central 50 dans lequel est logé le premier substrat 22, et une première extrémité aval 52 définissant la première sortie 32 de gaz d'échappement. La première extrémité aval 52 est venue de matière avec le premier tronçon aval 50, et prolonge celui-ci suivant la première direction, vers le volume 40.More specifically, the first peripheral wall 46 comprises a first central section 50 in which the first substrate 22 is housed, and a first downstream end 52 defining the first exhaust gas outlet 32. The first downstream end 52 is integral with the first downstream section 50, and extends the latter in the first direction, towards the volume 40.

De même, la seconde paroi périphérique 48 comprend un second tronçon central 54 dans lequel est logé le second substrat 26, et une seconde extrémité amont 56 définissant la seconde entrée 36 de gaz d'échappement.Similarly, the second peripheral wall 48 comprises a second central section 54 in which the second substrate 26 is housed, and a second upstream end 56 defining the second inlet 36 of exhaust gas.

Comme visible notamment sur les figures 3 et 4, les première et seconde parois périphériques 46, 48 sont entièrement séparées l'une de l'autre sur au moins 75% de la longueur longitudinale de la première ou de la seconde paroi périphérique.As visible especially on figures 3 and 4 the first and second peripheral walls 46, 48 are entirely separated from each other by at least 75% of the longitudinal length of the first or second peripheral wall.

Dans l'exemple représenté, la première paroi périphérique est longitudinalement plus courte que la seconde paroi périphérique, les première et seconde parois périphériques 46, 48 étant ainsi entièrement séparées sur au moins 80% de la longueur longitudinale de la première paroi périphérique.In the example shown, the first peripheral wall is longitudinally shorter than the second peripheral wall, the first and second peripheral walls 46, 48 thus being entirely separated over at least 80% of the longitudinal length of the first peripheral wall.

Plus précisément, la première extrémité aval 52 de la première paroi périphérique est en contact avec la seconde extrémité amont 56 de la seconde paroi périphérique, mais les premier et second tronçons centraux 50, 54 sont entièrement séparés l'un de l'autre. Ils ne sont jamais directement en contact l'un avec l'autreMore specifically, the first downstream end 52 of the first peripheral wall is in contact with the second upstream end 56 of the second peripheral wall, but the first and second central sections 50, 54 are entirely separated from each other. They are never in direct contact with each other

L'interstice 58 entre les deux tronçons centraux 50, 54 permet aux parois périphériques de s'expanser librement à haute température.The gap 58 between the two central sections 50, 54 allows the peripheral walls to expand freely at high temperature.

Dans une variante de réalisation représentée sur la figure 3, le dispositif de purification comprend des entretoises 60, interposées entre les première et seconde parois périphériques, de manière à maintenir un écartement entre les premier et second tronçons centraux 50, 54.In an alternative embodiment shown on the figure 3 , the purification device comprises spacers 60, interposed between the first and second peripheral walls, so as to maintain a spacing between the first and second central sections 50, 54.

Les entretoises 60 peuvent avoir toute forme adaptée : patte métallique, baguette s'étendant parallèlement aux première et seconde directions etc.The spacers 60 may have any suitable shape: metal tab, rod extending parallel to the first and second directions etc.

La variante de réalisation des figures 3 à 6, avec deux parois périphériques 46, 48 distinctes et indépendantes l'une de l'autre, est particulièrement adaptées au cas où les première et seconde surfaces 42, 44 en vis-à-vis présentent des rayons de courbure élevés.The variant embodiment of the Figures 3 to 6 , with two peripheral walls 46, 48 that are distinct and independent of each other, are particularly suitable in the case where the first and second surfaces 42, 44 vis-à-vis have high radii of curvature.

Comme illustré sur les figures, le premier tronçon central 50 présente, en section perpendiculairement à la première direction, une forme correspondant sensiblement à celle de la section du premier organe de purification 22. Un interstice 62 d'épaisseur sensiblement constant sépare le premier substrat 22 du premier tronçon central 50. Un matelas en une matière fibreuse 64 est interposé entre le premier substrat 22 et le premier tronçon central 50. Ce matelas permet de maintenir le premier substrat 22 radialement et axialement en position par rapport à la première enveloppe. De même, le second tronçon central 54 présente, considéré en section perpendiculairement à la seconde direction, une forme correspondant sensiblement à celle du second substrat 26. Un matelas 66 est interposé entre le second substrat 26 et le second tronçons central 54.As illustrated in the figures, the first central section 50 has, in section perpendicular to the first direction, a shape substantially corresponding to that of the section of the first purification member 22. A gap 62 of substantially constant thickness separates the first substrate 22 of the first central section 50. A mat of a fibrous material 64 is interposed between the first substrate 22 and the first central section 50. This mattress makes it possible to maintain the first substrate 22 radially and axially in position with respect to the first envelope. Similarly, the second central section 54 has, considered in section perpendicular to the second direction, a shape substantially corresponding to that of the second substrate 26. A mattress 66 is interposed between the second substrate 26 and the second central section 54.

Ainsi, comme visible sur la figure 6, les premier et second tronçons centraux 50, 54 présentent eux aussi des surfaces respectives 68, 70 en vis-à-vis l'une de l'autre, et séparées l'une de l'autre par l'interstice 58. L'une des surfaces 68, 70 est séparée en tout point de l'autre par une distance inférieure à 10 mm, de préférence inférieure à 5 mm.So, as visible on the figure 6 the first and second central sections 50, 54 also have respective surfaces 68, 70 facing each other, and separated from each other by the gap 58. one of the surfaces 68, 70 is separated at any point from the other by a distance of less than 10 mm, preferably less than 5 mm.

Selon un second mode de réalisation représenté sur les figures 7 à 9, le dispositif de purification 1 comprend une paroi périphérique unique 72 à contour fermé qui, considérée perpendiculairement à la première direction, entoure complétement les premier et second substrats 22, 26.According to a second embodiment shown on the Figures 7 to 9 , the purification device 1 comprises a single peripheral wall 72 with a closed contour which, considered perpendicular to the first direction, completely surrounds the first and second substrates 22, 26.

La paroi périphérique unique 72 comporte une première zone 74 entourant partiellement le premier substrat 22, et une seconde zone 76 entourant partiellement le second substrat 26. Les première et seconde zones constituent les première et seconde parois périphériques 46, 48 des première et seconde enveloppes externes 28, 34.The single peripheral wall 72 includes a first zone 74 partially surrounding the first substrate 22, and a second zone 76 partially surrounding the second substrate 26. The first and second zones constitute the first and second peripheral walls 46, 48 of the first and second outer envelopes 28, 34.

Dans la variante de réalisation de la figure 8, le premier organe de purification 20 comprend une première nappe 78 en matière fibreuse, interposée entre le premier substrat 22 et la paroi périphérique unique 72. La première nappe 78, considérée perpendiculairement à la première direction, entoure entièrement le premier substrat 22. Une zone 80 de cette nappe est interposée entre le premier substrat 22 et le second substrat 26. La nappe 78 est prévue pour retenir le premier substrat 22 en position par rapport à la paroi périphérique unique 72.In the variant embodiment of the figure 8 the first purification member 20 comprises a first ply 78 of fibrous material interposed between the first substrate 22 and the single peripheral wall 72. The first ply 78, considered perpendicular to the first direction, completely surrounds the first substrate 22. A zone 80 of this web is interposed between the first substrate 22 and the second substrate 26. The web 78 is provided to retain the first substrate 22 in position relative to the single peripheral wall 72.

Par ailleurs, le second organe de purification 24 comprend une seconde nappe 82 en matière fibreuse, interposée entre le second substrat 26 et la paroi périphérique unique 72. La seconde nappe 82, considéré perpendiculairement à la seconde direction, entoure entièrement le second substrat 26. Une zone 84 de la seconde nappe est interposée entre les premier et second substrats. Ainsi, les premier et second substrats sont séparés l'un de l'autre par la zone 80 de la première nappe et par la zone 84 de la seconde nappe, les deux zones étant empilées l'une sur l'autre. La seconde nappe 82 est prévue pour maintenir en position le second substrat 26 par rapport à la paroi périphérique unique 72.Furthermore, the second purification member 24 comprises a second ply 82 of fibrous material, interposed between the second substrate 26 and the single peripheral wall 72. The second ply 82, considered perpendicular to the second direction, completely surrounds the second substrate 26. An area 84 of the second web is interposed between the first and second substrates. Thus, the first and second substrates are separated from each other by the zone 80 of the first web and by the zone 84 of the second web, the two zones being stacked one on the other. The second ply 82 is provided to hold the second substrate 26 in position relative to the single peripheral wall 72.

Au moins un joint d'étanchéité 86 est de préférence disposé en contact à la fois avec la première nappe de matière fibreuse 78, la seconde nappe de matière fibreuse 82 et avec la paroi périphérique unique 72. Typiquement, deux joints d'étanchéité 86 sont disposés, de part et d'autre des deux substrats, dans le même plan que les zones 80 et 84. Ces joints permettent d'éviter les fuites de gaz d'échappement entre les nappes de matières fibreuses et la paroi périphérique. Ils permettent également de plaquer les première et seconde nappes 78, 82 contre les premier et second substrats 22, 26, le long des arrêtes de ces substrats.At least one seal 86 is preferably disposed in contact with both the first fibrous web 78, the second fibrous web 82 and the single peripheral wall 72. Typically, two seals 86 are arranged, on both sides of the two substrates, in the same plane as the zones 80 and 84. These seals prevent leakage of exhaust gas between the fibrous material plies and the peripheral wall. They also make it possible to press the first and second plies 78, 82 against the first and second substrates 22, 26, along the edges of these substrates.

Les joints 86 sont typiquement des baguettes longitudinales réalisées en une matière fibreuse.The seals 86 are typically longitudinal rods made of a fibrous material.

Alternativement, et comme représenté sur la figure 7, le dispositif de purification comprend une nappe périphérique 88 en matière fibreuse interposée entre les premier et second substrats 22, 26 d'une part et la paroi périphérique unique 72 d'autre part. La nappe périphérique 88, considérée perpendiculairement à la direction longitudinale, entoure entièrement les premier et second substrats 22, 26.Alternatively, and as shown on the figure 7 , the purification device comprises a peripheral layer 88 of fibrous material interposed between the first and second substrates 22, 26 on the one hand and the single peripheral wall 72 on the other hand. The peripheral layer 88, considered perpendicular to the longitudinal direction, completely surrounds the first and second substrates 22, 26.

Par ailleurs, le dispositif de purification 1 comprend encore une nappe intermédiaire 90 en matière fibreuse, interposée entre les premier et second substrats 22, 26. Plus précisément, la nappe intermédiaire 90 est interposée entre les première et seconde surfaces 42, 44. Elle s'étend sur toute la largeur des surfaces 42 et 44. La nappe intermédiaire 90 divise le volume délimité intérieurement par la nappe périphérique 88 en deux parties étanches l'une vis à vis de l'autre pour les gaz d'échappement.Furthermore, the purification device 1 further comprises an intermediate sheet 90 of fibrous material, interposed between the first and second substrates 22, 26. More specifically, the intermediate sheet 90 is interposed between the first and second surfaces 42, 44. extends over the entire width of the surfaces 42 and 44. The intermediate web 90 divides the volume delimited internally by the peripheral layer 88 in two parts sealed against each other for the exhaust gas.

Le premier substrat 22 est logé dans l'une des deux parties, le second substrat 26 dans l'autre partie.The first substrate 22 is housed in one of the two parts, the second substrate 26 in the other part.

Le mode de réalisation des figures 7 à 9, avec une paroi périphérique unique 72, est particulièrement bien adaptée au mode de réalisation de l'invention où les première et seconde surfaces 42, 44 présentent des courbures importantes, comme illustré sur la figure 9.The embodiment of the Figures 7 to 9 , with a single peripheral wall 72, is particularly well suited to the embodiment of the invention where the first and second surfaces 42, 44 have significant curvatures, as illustrated in FIG. figure 9 .

Selon un autre aspect de l'invention, indépendant du premier, le volume 40 est délimité par un couvercle 92 en forme de coupelle, rapporté directement sur les première et seconde enveloppes externes 28, 34.According to another aspect of the invention, independent of the first, the volume 40 is delimited by a lid 92 in the form of a cup, attached directly to the first and second outer shells 28, 34.

Plus précisément, le couvercle 92 comporte un fond 94 et un bord périphérique 96 à contour fermé en saillie par rapport au fond 94, le bord périphérique 96 étant directement fixé aux première et seconde enveloppes externes 28, 34.Specifically, the cover 92 has a bottom 94 and a peripheral edge 96 with a closed contour projecting from the bottom 94, the peripheral edge 96 being directly attached to the first and second outer shells 28, 34.

On entend ici par directement fixé ou rapporté le fait que le couvercle ne soit pas fixé à une pièce en forme de lunette telle que la pièce 8 représentée sur la figure 1, celle-ci étant à son tour fixée aux première et seconde enveloppes 28, 34. Du fait de l'absence de pièce en forme de lunette, il devient possible de rapprocher considérablement les premier et second organes de purification 20, 24 l'un de l'autre et ainsi de rendre le dispositif de purification beaucoup plus compact. Le couvercle est à son tour plus petit. La disparition de la lunette, et le fait que le couvercle soit plus petit, permettant d'alléger le dispositif de purification et de diminuer l'inertie thermique de ce dispositif. Par ailleurs, le nombre de liaisons est réduit, ce qui permet de diminuer le nombre de cordons de soudure.Here is meant by directly attached or reported the fact that the lid is not attached to a bezel-shaped piece such as the piece 8 shown on the figure 1 , this being in turn attached to the first and second envelopes 28, 34. Due to the absence of a spectacle-shaped part, it becomes possible to bring the first and second purification members 20, 24 one of them closer together. on the other and thus make the purification device much more compact. The lid is in turn smaller. The disappearance of the bezel, and the fact that the lid is smaller, to lighten the purification device and reduce the thermal inertia of this device. In addition, the number of connections is reduced, which makes it possible to reduce the number of weld seams.

Les dimensions de la pièce en forme de lunette, notamment l'écartement entre l'entrée et la sortie, sont contraintes, dans l'état de la technique des figures 1 et 2, par le fait qu'il faut prévoir suffisamment de matière pour former les cols entourant l'entrée et la sortie.The dimensions of the spectacle-shaped part, in particular the separation between the inlet and the outlet, are constrained, in the state of the art of the Figures 1 and 2 by providing enough material to form the necks surrounding the inlet and the outlet.

Typiquement, le fond 94 du couvercle est plat. Le bord périphérique 96 a une forme tubulaire. En variante, le fond 94 a une forme plus complexe, par exemple quand un dispositif d'injection d'ammoniac ou d'un précurseur de l'ammoniac est monté sur le couvercle.Typically, the bottom 94 of the lid is flat. The peripheral edge 96 has a tubular shape. Alternatively, the bottom 94 has a more complex shape, for example when an ammonia injection device or an ammonia precursor is mounted on the lid.

Plus précisément, les premier et second organes de purification 20, 24 définissent ensemble, à une extrémité tournée vers le volume 40, une surface d'extrémité externe 98 continue, à contour fermé, le bord périphérique 96 du couvercle étant lui aussi continu, à contour fermé. Le bord périphérique 96 est directement fixé à la surface d'extrémité externe 98.More specifically, the first and second purification members 20, 24 together define, at a end facing the volume 40, a continuous outer end surface 98, with a closed contour, the peripheral edge 96 of the lid being also continuous, closed contour. The peripheral edge 96 is directly attached to the outer end surface 98.

La surface d'extrémité externe 98 est tubulaire. La surface d'extrémité externe 98 est définie par la première extrémité aval 52 de la première enveloppe et par la seconde extrémité amont 56 de la seconde enveloppe, sans éventuellement les zones où elles sont plaquées l'une contre l'autre.The outer end surface 98 is tubular. The outer end surface 98 is defined by the first downstream end 52 of the first envelope and the second upstream end 56 of the second envelope, without possibly the areas where they are pressed against each other.

Ainsi, dans l'exemple de réalisation des figures 3 à 6, la première extrémité aval 52 et la seconde extrémité amont 56 font partie de deux parois distinctes l'une de l'autre, la première extrémité aval 52 et la seconde extrémité amont 56 étant accolées l'une à l'autre de manière à définir une surface continue à contour fermé.Thus, in the exemplary embodiment of Figures 3 to 6 , the first downstream end 52 and the second upstream end 56 are part of two walls distinct from each other, the first downstream end 52 and the second upstream end 56 being contiguous to one another so as to define a closed contour continuous surface.

Dans le mode de réalisation des figures 7 à 9, la surface d'extrémité externe 98 correspond à l'extrémité de la paroi périphérique unique 72 tournée vers le volume 40.In the embodiment of Figures 7 to 9 the outer end surface 98 corresponds to the end of the single peripheral wall 72 facing the volume 40.

Le bord périphérique 96 se termine, à l'opposé du fond 94, par un bord libre 100 continu, à contour fermé, de forme conjuguée de celle de la surface d'extrémité externe 98. Le bord libre 100 est plaqué contre la surface d'extrémité externe 98 et rigidement fixé à celle-ci, par exemple soudé à celle-ci.The peripheral edge 96 ends, opposite the bottom 94, by a free edge 100 continuous, closed contour, of conjugate shape of that of the outer end surface 98. The free edge 100 is pressed against the outer end surface 98 and rigidly attached thereto, for example welded thereto.

La surface d'extrémité externe 98 est engagée à l'intérieur du bord libre 100.The outer end surface 98 is engaged within the free edge 100.

Ainsi, le bord périphérique 96, et plus précisément son bord libre 100, délimite intérieurement une ouverture 101 ayant, perpendiculairement à la première direction, une surface donnée. La première sortie 32 présente perpendiculairement à la première direction une première surface. La seconde entrée 36 présente perpendiculairement à la seconde direction une seconde surface.Thus, the peripheral edge 96, and more precisely its free edge 100, internally delimits an opening 101 having, perpendicular to the first direction, a given surface. The first outlet 32 has a first surface perpendicular to the first direction. The second inlet 36 has a second surface perpendicular to the second direction.

La somme des première et seconde surfaces est sensiblement égale à la surface donnée.The sum of the first and second surfaces is substantially equal to the given area.

Typiquement, le bord libre 100 présente une forme obtenue en faisant circuler une génératrice de forme déterminée, le long d'une courbe directrice à contour fermé s'étendant dans un plan sensiblement perpendiculaire à la direction longitudinale. La génératrice a par exemple la forme d'un segment de droite d'orientation longitudinale. En variante, elle a la forme d'un segment de droite légèrement incliné par rapport à la direction longitudinale.Typically, the free edge 100 has a shape obtained by circulating a generatrix of determined shape, along a closed contour guide curve extending in a plane substantially perpendicular to the longitudinal direction. The generator has for example the shape of a line segment of longitudinal orientation. Alternatively, it has the shape of a line segment slightly inclined with respect to the longitudinal direction.

La courbe directrice à contour fermé peut avoir toute sorte de forme. Elle est par exemple ovale avec ou sans cintrage en partie centrale, en forme d'ellipse ou de toute autre forme.The closed contour guideline can have any kind of shape. It is for example oval with or without bending in the central part, elliptical or any other shape.

Dans le mode de réalisation des figures 3 à 6, dans lequel les première et seconde parois périphériques 46, 48 sont distinctes l'une de l'autre, la première extrémité aval 52 et la seconde extrémité amont 56 présentent avantageusement des premier et second tronçons respectifs 102 et 104 plaqués l'un contre l'autre, comme visible sur les figures 5 et 6.In the embodiment of Figures 3 to 6 , wherein the first and second peripheral walls 46, 48 are distinct from one another, the first downstream end 52 and the second upstream end 56 advantageously have first and second respective sections 102 and 104 pressed against each other. other, as visible on the Figures 5 and 6 .

Les premier et second tronçons 102, 104 sont avantageusement droits, c'est-à-dire rectilignes. Ils s'étendent typiquement parallèlement aux première et seconde surfaces 42, 44. Si on appelle première longueur périmétrique la longueur du périmètre de la première extrémité aval, et seconde longueur périmétrique la longueur du périmètre de la seconde extrémité amont, alors les premier et second tronçons 102, 104 s'étendent respectivement sur au moins 15% de la première longueur périmétrique et sur au moins 10% de la seconde longueur périmétrique, respectivement.The first and second sections 102, 104 are advantageously straight, that is to say rectilinear. They typically extend parallel to the first and second surfaces 42, 44. If the first perimeter length is referred to as the perimeter length of the first downstream end, and the second perimeter length is the length of the perimeter of the second upstream end, then the first and second sections 102, 104 respectively extend over at least 15% of the first perimeter length and at least 10% of the second perimeter length, respectively.

De préférence, des premier et second tronçons 102, 104 s'étendent respectivement sur au moins 20% de la première longueur périmétrique et sur au moins 15% de la seconde longueur périmétrique respectivement.Preferably, first and second sections 102, 104 respectively extend over at least 20% of the first perimeter length and at least 15% of the second perimeter length respectively.

Les premier et second tronçons 102, 104 s'étendent longitudinalement sur moins de 25% de la longueur longitudinale des première et/ou seconde parois périphériques 46, 48.The first and second sections 102, 104 extend longitudinally over less than 25% of the longitudinal length of the first and / or second peripheral walls 46, 48.

Comme visible sur les figures 3 et 4, la première extrémité aval 52 et la seconde extrémité amont 56 présentent, perpendiculairement aux première et seconde directions, des première et seconde sections supérieures à celles des premier et second tronçons centraux 50, 54.As visible on figures 3 and 4 , the first downstream end 52 and the second upstream end 56 have, perpendicular to the first and second directions, first and second sections greater than those of the first and second central sections 50, 54.

En d'autres termes, la première extrémité aval 52 fait saillie légèrement vers l'extérieur du premier organe de purification par rapport au premier tronçon central 50, et ce sur toute ou pratiquement toute sa périphérie. De même, le second tronçon amont 56 fait saillie vers l'extérieur du second organe de purification par rapport au second tronçon central 54, et ce sur toute ou pratiquement toute sa périphérie.In other words, the first downstream end 52 projects slightly outwardly of the first purification member relative to the first central section 50, and this over all or substantially all of its periphery. Similarly, the second upstream section 56 projects outwardly from the second purification member relative to the second central section 54, and this over all or substantially all of its periphery.

Le premier tronçon aval est séparé du premier tronçon central par un épaulement sortant 106. La seconde extrémité amont 56 est séparée du second tronçon central 54 par un épaulement sortant 108.The first downstream section is separated from the first central section by an outgoing shoulder 106. The second upstream end 56 is separated from the second central section 54 by an outgoing shoulder 108.

Cet agencement permet de créer l'interstice 58 entre les tronçons centraux 50 et 54.This arrangement makes it possible to create the gap 58 between the central sections 50 and 54.

Du fait de cet élargissement de sections, la première extrémité aval 52 et la seconde extrémité amont 56 ne participent pas au blocage en position des premier et second substrats par l'intermédiaire des nappes de matière fibreuse 64 et 66. Ce maintien est réalisé exclusivement au niveau des tronçons centraux 50 et 54.Due to this widening of sections, the first downstream end 52 and the second upstream end 56 do not participate in the blocking in position of the first and second substrates through the fibrous webs 64 and 66. This maintenance is carried out exclusively at level of the central sections 50 and 54.

Comme visible sur les figures 10 et 11, il est possible de créer les premier et second tronçons 102, 104 au niveau de la première extrémité aval 52 et de la seconde extrémité amont 56 quelle que soit la forme des premier et second substrats 22, 26.As visible on Figures 10 and 11 , it is possible to create the first and second sections 102, 104 at the first downstream end 52 and the second upstream end 56 regardless of the shape of the first and second substrates 22, 26.

Dans l'exemple de réalisation des figures 10 et 11, les premier et second substrats 22, 26 sont de sections circulaires, considérés perpendiculairement respectivement aux première et seconde directions. En variante, le premier et/ou le second substrat a une forme ovale ou encore une forme de type « race-track », avec deux côtés sensiblement plats ou à grand rayon de courbure, sensiblement parallèles l'un à l'autre, raccordés par des arcs de cercle de rayon de courbure plus faible.In the exemplary embodiment of Figures 10 and 11 , the first and second substrates 22, 26 are of circular sections, considered perpendicular respectively to the first and second directions. Alternatively, the first and / or second substrate has an oval shape or a race-track type shape, with two substantially flat sides or large radius of curvature, substantially parallel to one another, connected by arcs of smaller radius of curvature.

Le premier tronçon central 50 présente une forme cylindrique, de sections circulaires. La première extrémité aval 52 comporte une portion 110 en arc de cercle, s'étendant sur au moins 60% de la périphérie de la première extrémité aval, en plus du tronçon droit 102. Le tronçon droit 102 s'étend dans un plan sensiblement tangent au premier substrat 22. Il est raccordé à la portion 110 par des flancs 112 se raccordant au tronçon droit 102 selon une direction comprise entre la perpendiculaire au tronçon droit 102 et la tangente à la portion 110.The first central section 50 has a cylindrical shape with circular sections. The first downstream end 52 comprises a portion 110 in an arc of a circle, extending over at least 60% of the periphery of the first downstream end, in addition to the straight section 102. The straight section 102 extends in a substantially tangent plane to the first substrate 22. It is connected to the portion 110 by flanks 112 connecting to the straight section 102 in a direction between the perpendicular to the straight section 102 and the tangent to the portion 110.

Le tronçon droit 102 est typiquement formé seulement au niveau des extrémités du canning.Straight section 102 is typically formed only at the ends of the canning.

De même, le second tronçon central 54 présente une forme cylindrique, de section circulaire adaptée pour recevoir le second substrat 26. La seconde extrémité amont 56 présente une portion en arc de cercle 114, s'étendant sur au moins 60% de la périphérie de la seconde extrémité amont, en plus du tronçon droit 104. Le tronçon droit 104 s'étend dans un plan tangent au second substrat 26. Le tronçon droit 104 est raccordé à la portion 114 par des flancs 116 se raccordant au tronçon droit 104 selon une direction comprise entre la perpendiculaire au tronçon 104 et la tangente à la portion 114.Similarly, the second central section 54 has a cylindrical shape, of circular section adapted to receive the second substrate 26. The second upstream end 56 has an arcuate portion 114, extending over at least 60% of the periphery of the the second upstream end, in addition to the right section 104. The straight section 104 extends in a plane tangential to the second substrate 26. The straight section 104 is connected to the portion 114 by flanks 116 connecting to the straight section 104 in a manner direction between the perpendicular to the section 104 and the tangent to the portion 114.

Selon encore un autre aspect, illustré sur les figures 12 à 16, le dispositif de purification 1 comporte un couvercle externe 118 et un cône interne 120 logé dans le couvercle externe 118.According to yet another aspect, illustrated on the Figures 12 to 16 , the purification device 1 comprises an outer cover 118 and an inner cone 120 housed in the outer cover 118.

Les première et seconde parois périphériques 46, 48 présentent respectivement une première extrémité amont 122 délimitant la première entrée de gaz d'échappement 30, et une seconde extrémité aval 124, délimitant la seconde sortie de gaz d'échappement 38. Le couvercle externe 118 est de taille et de forme choisie de manière à couvrir à la fois la première entrée 30 et la seconde sortie 38. On entend par là que la première extrémité amont 122 et la seconde extrémité aval 124 sont entièrement logées dans le couvercle externe 118. Dans une variante non représentée, le couvercle externe 118 est logé dans la première extrémité amont 122 et dans la seconde extrémité aval 124.The first and second peripheral walls 46, 48 respectively have an upstream first end 122 delimiting the first exhaust gas inlet 30, and a second downstream end 124 delimiting the second exhaust gas outlet 38. The outer cover 118 is of size and shape chosen so as to cover both the first inlet 30 and the second outlet 38. This means that the first upstream end 122 and the second downstream end 124 are fully housed in the outer cover 118. In a variant not shown, the outer cover 118 is housed in the first upstream end 122 and in the second downstream end 124.

L'entrée 16 et la sortie 18 de gaz d'échappement sont ménagées dans le couvercle externe 118.The inlet 16 and the outlet 18 of exhaust gas are formed in the outer cover 118.

Le cône interne 120 présente une extrémité de sortie 126 couvrant seulement la première entrée 30, et une extrémité d'entrée 128 raccordée de manière étanche à l'entrée 16.The inner cone 120 has an outlet end 126 covering only the first inlet 30, and an inlet end 128 sealingly connected to the inlet 16.

Plus précisément, l'extrémité de sortie 126 est logée dans la première extrémité amont 122 ou inversement la première extrémité amont 122 est logée dans l'extrémité de sortie 126.More specifically, the outlet end 126 is housed in the first upstream end 122 or conversely the first upstream end 122 is housed in the outlet end 126.

Le couvercle externe 118 présente une forme générale de coupelle, avec un fond 130 dans lequel sont ménagées l'entrée 16 et la sortie 18, et une paroi latérale 132 s'étendant tout autour du fond 130, et faisant saillie d'un côté du fond 130. La paroi latérale 132 est à contour fermé, et fait saillie longitudinalement vers les première et seconde parois périphériques 46, 48.The outer cover 118 has a generally cup-like shape, with a bottom 130 in which the inlet 16 and the outlet 18 are formed, and a side wall 132 extending around the bottom 130, and projecting from one side of the The side wall 132 is of closed contour, and protrudes longitudinally towards the first and second peripheral walls 46, 48.

Comme visible sur les figures, les première et seconde parois périphériques 46, 48 présentent longitudinalement sensiblement la même longueur. La première extrémité amont 122 et la seconde extrémité aval 124 définissent donc ensemble une autre surface externe continue 134, à contour fermé, à laquelle la paroi latérale 132 est directement fixée.As shown in the figures, the first and second peripheral walls 46, 48 have substantially the same length longitudinally. The first upstream end 122 and the second downstream end 124 thus together define another continuous external surface 134, closed contour, to which the side wall 132 is directly fixed.

L'entrée 16 et la sortie 18 sont délimitées par des cols 136 et 138, faisant saillies vers l'extérieur du dispositif de purification. Les cols 136 et 138 font saillis, par rapport au fond 130, longitudinalement d'un côté opposé à la paroi latérale 132.The inlet 16 and the outlet 18 are delimited by necks 136 and 138 projecting outwardly from the purification device. The necks 136 and 138 protrude from the bottom 130 longitudinally on a side opposite to the side wall 132.

L'entrée 16 est raccordée mécaniquement directement à l'équipement amont 140 (figure 13).The inlet 16 is mechanically connected directly to the upstream equipment 140 ( figure 13 ).

Plus précisément, l'équipement amont 140 présente une sortie de gaz d'échappement 142, éventuellement prolongée par un conduit de circulation de gaz d'échappement. L'entrée 16 est raccordée mécaniquement soit directement à la sortie de gaz d'échappement 142, soit directement au conduit. Le col 136 est rigidement fixé à l'équipement amont 140. Par exemple, il est soudé à un bicône 143 du type représenté sur la figure 16, lui-même raccordé à l'équipement amont 140, typiquement par un collier en V. En variante, le col 136 est directement raccordé à un cône-bride de l'équipement amont 140, typiquement par un collier en V. Dans la variante représentée sur la figure 13, l'entrée 16 est fixée à l'équipement amont 140 par le biais d'une bride 144.More specifically, the upstream equipment 140 has an exhaust gas outlet 142, possibly extended by an exhaust gas circulation duct. The inlet 16 is mechanically connected either directly to the exhaust gas outlet 142, or directly to the duct. The neck 136 is rigidly fixed to the upstream equipment 140. For example, it is welded to a bicone 143 of the type shown in FIG. figure 16 it is itself connected to the upstream equipment 140, typically by a V-shaped collar. In a variant, the neck 136 is directly connected to a cone-flange of the upstream equipment 140, typically by a V-shaped collar. represented on the figure 13 the inlet 16 is fixed to the upstream equipment 140 by means of a flange 144.

Ainsi, au moins le couvercle externe 118 est mécaniquement raccordé directement à l'équipement amont 140.Thus, at least the outer cover 118 is mechanically connected directly to the upstream equipment 140.

Selon une première variante de réalisation, le cône interne 120 est mécaniquement raccordé à l'équipement amont 140 seulement par l'intermédiaire du couvercle externe 118, typiquement par son extrémité d'entrée 128. Cette situation est représentée sur les figures 12 à 15.According to a first variant embodiment, the internal cone 120 is mechanically connected to the upstream equipment 140 only via the outer cover 118, typically by its inlet end 128. This situation is represented on the Figures 12 to 15 .

En d'autres termes, les efforts et les contraintes transmises entre le dispositif de purification et l'équipement amont 140 sont transmis principalement à travers le couvercle externe 118. Ces efforts passent notamment, voire exclusivement, par la liaison entre le couvercle externe 118 et l'équipement amont 140.In other words, the stresses and stresses transmitted between the purification device and the upstream equipment 140 are transmitted mainly through the outer cover 118. These efforts pass especially, or even exclusively, through the connection between the outer cover 118 and the upstream equipment 140.

En conséquence, le couvercle externe 118 est réalisé en un matériau relativement plus épais, par exemple d'épaisseur comprise entre 1 mm et 2 mm. Le couvercle 118 est par exemple réalisé en acier inoxydable, par exemple en 1.4509, 1.4510, 1.4512 ou encore en 1.4301.As a result, the outer cover 118 is made of a relatively thicker material, for example of thickness between 1 mm and 2 mm. The cover 118 is for example made of stainless steel, for example in 1.4509, 1.4510, 1.4512 or 1.4301.

Le cône interne 120, du fait qu'il ne reprend pas d'effort, est réalisé en un matériau relativement moins épais que le couvercle externe 118, par exemple d'épaisseur comprise entre 0.5 mm et 1 mm. Par exemple, le cône interne 120 est réalisé en acier inoxydable, par exemple en 1.4509, 1.4510 ou en 1.4301.The internal cone 120, because it does not take up effort, is made of a relatively less thick material than the outer cover 118, for example of thickness between 0.5 mm and 1 mm. For example, the inner cone 120 is made of stainless steel, for example 1.4509, 1.4510 or 1.4301.

Dans une seconde variante de réalisation, illustrée sur la figure 16, le cône interne 120 est raccordé à l'équipement amont 140 avec le couvercle externe 118. En d'autres termes, une liaison unique 145 double, solidarise le cône interne 120 et le couvercle externe 118 à l'équipement amont 140.In a second variant embodiment, illustrated on the figure 16 , the inner cone 120 is connected to the upstream equipment 140 with the outer cover 118. In other words, a single link 145 doubles, secures the inner cone 120 and the outer cover 118 to the upstream equipment 140.

Cette unique liaison 145 est par exemple une soudure. Dans l'exemple représenté, elle solidarise le cône interne 120 et le couvercle externe au bicône 143, celui-ci étant raccordé à l'équipement amont 140.This single link 145 is for example a weld. In the example shown, it secures the inner cone 120 and the outer cover to the bicone 143, the latter being connected to the upstream equipment 140.

Comme décrit précédemment, du fait que le couvercle externe 118 est réalisé en un matériau relativement plus épais, l'essentiel des efforts sera transmis entre le dispositif de purification et l'équipement amont 140 via le couvercle externe 118. Il est ainsi possible de réaliser le cône interne 120 en un matériau relativement moins épais. Les matériaux et les épaisseurs du couvercle externe 118 et du cône interne 120 sont typiquement ceux décrits par la première variante de réalisation.As described above, because the outer cover 118 is made of a relatively thicker material, most of the effort will be transmitted between the purification device and the upstream equipment 140 via the outer cover 118. It is thus possible to realize the inner cone 120 in a relatively less thick material. The materials and the thicknesses of the outer cover 118 and the inner cone 120 are typically those described by the first embodiment.

Comme visible notamment sur la figure 13, le cône interne 120 présente une section qui va en s'élargissant à partir de l'extrémité d'entrée 128 jusqu'à l'extrémité de sortie 126. L'extrémité de sortie 126 est rigidement fixée, de manière étanche, à la première extrémité amont 122. Elle présente par exemple une section interne complémentaire de la section externe de la première extrémité amont 122, cette première extrémité amont 122 étant engagée dans l'extrémité de sortie 126 du cône interne.As visible especially on the figure 13 , the inner cone 120 has a section widening from the inlet end 128 to the outlet end 126. The outlet end 126 is rigidly attached, in a sealed manner, to the first end upstream 122. It has for example an inner section complementary to the outer section of the first upstream end 122, the first upstream end 122 being engaged in the outlet end 126 of the inner cone.

L'extrémité d'entrée 128 du cône interne est engagée dans le col 136. Elle est rigidement fixé au col 136, par tout moyen adapté. Typiquement, l'extrémité d'entrée 128 présente une section externe de forme complémentaire à la section interne du col 136. Elle est fixée par exemple par une ligne de soudure (non représentée) à la surface interne du col 136. En variante, elle est emmanchée sans jeu, ce qui contribue à l'absence de transmission d'effort à travers le cône interne.The inlet end 128 of the inner cone is engaged in the neck 136. It is rigidly fixed to the neck 136 by any suitable means. Typically, the inlet end 128 has an outer section of complementary shape to the inner section of the neck 136. It is fixed for example by a weld line (not shown) to the inner surface of the neck 136. Alternatively, it is fitted without play, which contributes to the absence of force transmission through the internal cone.

Par ailleurs, comme visible sur la figure 13, le cône interne 120 et le couvercle externe 118 délimitent entre eux un espace 146 s'étendant sur toute la périphérie du cône interne 120 et communiquant fluidiquement avec la sortie 18. Ainsi, les gaz d'échappement sortant du second organe de purification 24 par la seconde sortie 38 vont circuler autour du cône interne 120, dans l'espace 146, avant d'être évacué par la sortie 18.Moreover, as visible on the figure 13 , the inner cone 120 and the outer cover 118 delimit between them a space 146 extending over the entire periphery of the inner cone 120 and fluidly communicating with the outlet 18. Thus, the exhaust gases leaving the second purification member 24 by the second outlet 38 will circulate around the internal cone 120, in the space 146, before being discharged through the outlet 18.

L'agencement décrit ci-dessus présente de multiples avantages. Le fait de réaliser le cône interne 120 en un matériau mince permet de réduire le poids et l'inertie thermique du dispositif de purification. Par ailleurs, le fait que l'espace 146 permette la circulation de gaz d'échappement sortant du second organe de purification autour du cône interne 120, permet une montée en température rapide du cône interne 120, puisque ce cône est exposé au gaz d'échappement à la fois par sa surface interne et par sa surface externe. Ainsi, dans le cas où le premier et/ou le second substrat doit atteindre une température minimum pour que la dépollution des gaz d'échappement soit efficace, cette température est atteinte plus vite.The arrangement described above has many advantages. Making the inner cone 120 of a thin material reduces the weight and thermal inertia of the purification device. Moreover, the fact that space 146 allows the circulation of exhaust gas leaving the second purification member around the inner cone 120, allows a rapid temperature rise of the inner cone 120, since this cone is exposed to the exhaust gas both by its inner surface and by its outer surface. Thus, in the case where the first and / or second substrate must reach a minimum temperature for the exhaust gas depollution is effective, this temperature is reached faster.

Les premier et second substrats peuvent être de tout type adapté pour la purification des gaz d'échappement. Par exemple, pour les moteurs à essence, le premier substrat est un catalyseur trois-voies et le second substrat est un autre catalyseur trois-voies, ou un filtre à particules. Pour les moteurs diesels, le premier substrat est par exemple un catalyseur d'oxydation, et le second substrat est par exemple un filtre à particules. Alternativement, le premier substrat est un PNA (Passive NOx Absorber, ou absorbeur de NOx passif) ou un piège à NOx (LNT Lean Nox Trap), et le second substrat est un filtre à particules, ou est un catalyseur de type SCR (Selective Catalytic Réduction ou réduction catalytique sélective) ou encore un filtre catalyseur de type SCRF (Selective Catalytic Réduction Filter ou filtre à réduction catalytique sélective), ou encore un filtre catalyseur de type SCRF suivi par un catalyseur de type SCR. Dans le cas où le second substrat comprend un catalyseur de type SCR ou un SCRF, un dispositif de mélange est prévu dans le volume 40, de préférence. Dans ce cas, le dispositif de purification comprend un dispositif d'injection d'un produit réducteur d'oxydes d'azote tel que l'ammoniac ou un précurseur d'ammoniac, agencé pour réaliser l'injection en amont du dispositif de mélange. L'injection est typiquement réalisée dans le volume 40. Le produit injecté est par exemple le produit vendu sous le nom commercial Adblue, ou une solution aqueuse d'urée, ou encore de l'ammoniac gazeux (technologie ASDS).The first and second substrates may be of any type suitable for the purification of the exhaust gases. For example, for gasoline engines, the first substrate is a three-way catalyst and the second substrate is another three-way catalyst, or a particulate filter. For diesel engines, the first substrate is for example an oxidation catalyst, and the second substrate is for example a particulate filter. Alternatively, the first substrate is a PNA (Passive NOx Absorber, or passive NOx absorber) or a NOx trap (LNT Lean Nox Trap), and the second substrate is a particulate filter, or is a SCR type catalyst (Selective Catalytic reduction or selective catalytic reduction) or a catalytic filter SCRF type (Selective Catalytic Reduction Filter or selective catalytic reduction filter), or a SCRF type catalyst filter followed by a catalyst SCR type. In the case where the second substrate comprises an SCR type catalyst or an SCRF, a mixing device is provided in the volume 40, preferably. In this case, the purification device comprises a device for injecting a nitrogen oxide reducing product such as ammonia or an ammonia precursor, arranged to perform the injection upstream of the mixing device. The injection is typically carried out in volume 40. The injected product is for example the product sold under the trade name Adblue, or an aqueous solution of urea, or else ammonia gas (ASDS technology).

Il est à noter que les premier et second substrats 22, 26 n'occupent pas nécessairement tout le volume délimité intérieurement par les première et seconde enveloppes. Comme illustré sur la figure 15, l'un et/ou l'autre des substrats peut n'occuper qu'une partie de la longueur longitudinale de la première et/ou de la seconde enveloppe. Le volume libre est alors susceptible d'être utilisé pour l'implantation d'un dispositif d'injection d'un produit réducteur d'oxydes d'azote, ou d'un mélangeur, ou de tout autre dispositif adapté.It should be noted that the first and second substrates 22, 26 do not necessarily occupy all the volume delimited internally by the first and second envelopes. As illustrated on the figure 15 one and / or the other of the substrates may occupy only a part of the longitudinal length of the first and / or the second envelope. The free volume is then likely to be used for the implantation of a device for injecting a nitrogen oxide reducing product, or a mixer, or any other suitable device.

Claims (15)

Dispositif de purification des gaz d'échappement, le dispositif de purification (1) comprenant : - un premier organe de purification (20) comprenant une première enveloppe externe (28) délimitant une première entrée (30) de gaz d'échappement et une première sortie (32) de gaz d'échappement, et un premier substrat (22) de purification des gaz d'échappement logé dans la première enveloppe (28), les gaz d'échappement circulant suivant une première direction (D1) dans le premier substrat (22); - un second organe de purification (24) comprenant une seconde enveloppe externe (34) délimitant une seconde entrée (36) de gaz d'échappement et une seconde sortie (38) de gaz d'échappement, et un second substrat (26) de purification des gaz d'échappement logé dans la seconde enveloppe (34), les gaz d'échappement circulant dans le second substrat (26) suivant une seconde direction (D2) opposée à la première direction (D1), les premier et second organes de purification (20, 24) étant disposés côte-à-côte et sensiblement parallèlement l'un à l'autre ; - un volume (40) raccordant fluidiquement la première sortie (32) à la seconde entrée (36) ; caractérisé en ce que le volume (40) est délimité par un couvercle (92) en forme de coupelle rapporté directement sur les première et seconde enveloppes externes (28, 34).Exhaust purification device, the purification device (1) comprising: a first purification device (20) comprising a first external envelope (28) delimiting a first exhaust gas inlet (30) and a first exhaust gas outlet (32), and a first substrate (22) for exhaust gas; purifying exhaust gas housed in the first shell (28), the exhaust gas flowing in a first direction (D1) in the first substrate (22); a second purification member (24) comprising a second outer envelope (34) delimiting a second exhaust gas inlet (36) and a second exhaust gas outlet (38), and a second exhaust gas (26) substrate; purification of the exhaust gases housed in the second envelope (34), the exhaust gases flowing in the second substrate (26) in a second direction (D2) opposite the first direction (D1), the first and second members of purification (20, 24) being arranged side by side and substantially parallel to each other; a volume (40) fluidly connecting the first output (32) to the second input (36); characterized in that the volume (40) is delimited by a cup-shaped lid (92) attached directly to the first and second outer shells (28, 34). Dispositif de purification selon la revendication 1, caractérisé en ce que le couvercle (92) comporte un fond (94) et un bord périphérique (96) à contour fermé en saillie par rapport au fond (94), le bord périphérique (96) ayant un bord libre (100) directement fixé aux première et seconde enveloppes externes (28, 34).Purification device according to claim 1, characterized in that the cover (92) has a bottom (94) and a peripheral edge (96) with a closed contour projecting from the bottom (94), the peripheral edge (96) having a free edge (100) directly attached to the first and second outer shells (28, 34). Dispositif de purification selon la revendication 2, caractérisé en ce que le bord libre (100) présente une forme obtenue en faisant circuler une génératrice le long d'une courbe directrice à contour fermé, la génératrice étant sensiblement parallèle aux première et seconde directions (D1, D2), la courbe directrice s'étendant dans un plan perpendiculaire aux première et seconde directions (D1, D2).Purification device according to claim 2, characterized in that the free edge (100) has a shape obtained by circulating a generator along a closed contour direction curve, the generator being substantially parallel to the first and second directions (D1 , D2), the guide curve extending in a plane perpendicular to the first and second directions (D1, D2). Dispositif de purification selon la revendication 2 ou 3, caractérisé en ce que le bord libre (100) délimite intérieurement une ouverture ayant perpendiculairement à la première direction (D1) une surface donnée, la première sortie (32) ayant perpendiculairement à la première direction (D1) une première surface, la seconde entrée (36) ayant perpendiculairement à la seconde direction (D2) une seconde surface, la somme des première et seconde surfaces étant sensiblement égale à la surface donnée.Purification device according to claim 2 or 3, characterized in that the free edge (100) delimits internally an opening having a given surface perpendicular to the first direction (D1), the first outlet (32) having perpendicular to the first direction ( D1) a first surface, the second inlet (36) having a second surface perpendicular to the second direction (D2), the sum of the first and second surfaces being substantially equal to the given surface. Dispositif de purification selon l'une quelconque des revendications 2 à 4, caractérisé en ce que les premier et second organes de purification (20, 24) définissent ensemble vers le volume (40) une surface d'extrémité externe (98) continue à contour fermé, le bord libre (100) étant de forme conjuguée de celle de la surface externe (98).Purification device according to one of Claims 2 to 4, characterized in that the first and second purification members (20, 24) together define a continuous outer end surface (98) with a contour (40) towards the volume (40). closed, the free edge (100) being of conjugate shape with that of the outer surface (98). Dispositif de purification selon la revendication 5, caractérisé en ce que la surface d'extrémité externe (98) est de forme tubulaire.Purification device according to claim 5, characterized in that the outer end surface (98) is tubular in shape. Dispositif de purification selon la revendication 5 ou 6, caractérisé en ce que : - la première enveloppe (28) comprend une première paroi périphérique (46) ayant un premier tronçon central (50) qui entoure le premier substrat (22) et une première extrémité aval (52) prolongeant le premier tronçon central (50) vers le volume (40); - la seconde enveloppe (34) comprend une seconde paroi périphérique (48) ayant un second tronçon central (54) qui entoure le second substrat (26) et une seconde extrémité amont (56) prolongeant le second tronçon central (54) vers le volume (40); - la première extrémité aval (52) et la seconde extrémité amont (56) définissant ensemble la surface d'extrémité (98). Purification device according to claim 5 or 6, characterized in that : the first envelope (28) comprises a first peripheral wall (46) having a first central section (50) surrounding the first substrate (22) and a first downstream end (52) extending the first central section (50) towards the volume (40); the second envelope (34) comprises a second peripheral wall (48) having a second central section (54) surrounding the second substrate (26) and a second upstream end (56) extending the second central section (54) towards the volume (40); the first downstream end (52) and the second upstream end (56) together defining the end surface (98). Dispositif de purification selon l'une quelconque des revendications précédentes, caractérisé en ce que le couvercle (92) est venu de matière.Purification device according to any one of the preceding claims, characterized in that the cover (92) is integral. Dispositif de purification selon l'une quelconque des revendications précédentes, caractérisé en ce que : - la première enveloppe (28) comprend une première paroi périphérique (46) qui, considérée perpendiculairement à la première direction (D1), entoure entièrement le premier substrat (22); - la seconde enveloppe (34) comprend une seconde paroi périphérique (48) qui, considérée perpendiculairement à la seconde direction (D2), entoure entièrement le second substrat (26); - les première et seconde parois périphériques (46, 48) étant distinctes l'une de l'autre et ayant respectivement une première extrémité aval (52) et une seconde extrémité amont (56) délimitant la première sortie (32) et la seconde entrée (36); - la première extrémité aval (52) et la seconde extrémité amont (56) ayant des premier et second tronçons (102, 104) respectifs plaqués l'un contre l'autre. Purification device according to one of the preceding claims, characterized in that : the first envelope (28) comprises a first peripheral wall (46) which, considered perpendicular to the first direction (D1), completely surrounds the first substrate (22); the second envelope (34) comprises a second peripheral wall (48) which, considered perpendicular to the second direction (D2), completely surrounds the second substrate (26); the first and second peripheral walls (46, 48) being distinct from each other and having respectively a first downstream end (52) and a second upstream end (56) delimiting the first outlet (32) and the second inlet (36); the first downstream end (52) and the second upstream end (56) having respective first and second sections (102, 104) pressed against each other. Dispositif de purification selon la revendication 9, caractérisé en ce que les premier et second tronçons (102, 104) sont droits.Purification device according to claim 9, characterized in that the first and second sections (102, 104) are straight. Dispositif de purification selon la revendication 9 ou 10, caractérisé en ce que la première extrémité aval (52) et la seconde extrémité amont (56) ont des première et seconde longueurs périmétriques respectives, les premier et second tronçons (102, 104) s'étendant respectivement sur au moins 15% de la première longueur périmétrique et sur au moins 10% de la seconde longueur périmétrique.Purification device according to claim 9 or 10, characterized in that the first downstream end (52) and the second upstream end (56) have respective first and second perimeter lengths, the first and second sections (102, 104). extending over at least 15% of the first perimeter length and at least 10% of the second perimeter length respectively. Dispositif de purification selon l'une quelconque des revendications 9 à 11, caractérisé en ce que les première et seconde parois périphériques (46, 48) ont des premier et second tronçons centraux (50, 54) respectifs situés à distance de la première extrémité aval (52) et de la seconde extrémité amont (56) suivant les première et seconde directions (D1, D2), la première extrémité aval (52) et la seconde extrémité amont (56) ayant perpendiculairement aux première et seconde directions (D1, D2) des première et seconde sections respectivement supérieures à celles des premier et second tronçons centraux (50, 54).Purification device according to one of Claims 9 to 11, characterized in that the first and second peripheral walls (46, 48) have respective first and second central sections (50, 54) at a distance from the first downstream end (52) and the second upstream end (56) along the first and second directions (D1, D2), the first downstream end (52) and the second upstream end (56) having perpendicular to the first and second directions (D1, D2 ) first and second sections respectively greater than those of the first and second central sections (50, 54). Dispositif de purification selon l'une quelconque des revendications 1 à 8, caractérisé en ce que le dispositif de purification (1) comporte une paroi périphérique unique (72) à contour fermé qui, considérée perpendiculairement à la première direction, entoure entièrement les premier et second substrats (22, 26).Purification device according to any one of claims 1 to 8, characterized in that the purification device (1) has a single peripheral wall (72) with a closed contour which, considered perpendicular to the first direction, completely surrounds the first and second substrates (22, 26). Dispositif de purification selon la revendication 13, caractérisé en ce que la paroi périphérique unique (72) présente une extrémité délimitant à la fois la première sortie (32) et la seconde entrée (36), le couvercle (92) étant directement fixé à ladite extrémité.Purification device according to claim 13, characterized in that the single peripheral wall (72) has an end delimiting at the same time the first outlet (32) and the second inlet (36), the cover (92) being directly attached to said end. Ligne d'échappement comprenant un dispositif de purification (1) selon l'une quelconque des revendications précédentes.Exhaust line comprising a purification device (1) according to any one of the preceding claims.
EP15305614.8A 2015-04-22 2015-04-22 Device for purifying exhaust gases and exhaust line comprising said device Not-in-force EP3085916B1 (en)

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EP15305614.8A EP3085916B1 (en) 2015-04-22 2015-04-22 Device for purifying exhaust gases and exhaust line comprising said device
KR1020160048054A KR20160125900A (en) 2015-04-22 2016-04-20 Exhaust gas purification device, exhaust line comprising such device
KR1020180096936A KR101982979B1 (en) 2015-04-22 2018-08-20 Exhaust gas purification device, exhaust line comprising such device

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KR101982979B1 (en) 2019-05-27

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