EP3851646B1 - Gas/gas mixer for introducing gas into the waste gas flow of a combustion engine - Google Patents

Gas/gas mixer for introducing gas into the waste gas flow of a combustion engine Download PDF

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Publication number
EP3851646B1
EP3851646B1 EP21150148.1A EP21150148A EP3851646B1 EP 3851646 B1 EP3851646 B1 EP 3851646B1 EP 21150148 A EP21150148 A EP 21150148A EP 3851646 B1 EP3851646 B1 EP 3851646B1
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EP
European Patent Office
Prior art keywords
gas
flow
mixer body
exhaust gas
body part
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.)
Active
Application number
EP21150148.1A
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German (de)
French (fr)
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EP3851646A1 (en
Inventor
Enver Kurpejovic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberspaecher Exhaust Technology GmbH and Co KG
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Purem GmbH
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Publication of EP3851646A1 publication Critical patent/EP3851646A1/en
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Publication of EP3851646B1 publication Critical patent/EP3851646B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus

Definitions

  • the present invention relates to a gas/gas mixer according to the preamble of claim 1, with which gas can be introduced into the exhaust gas flow of an internal combustion engine.
  • a gas/gas mixer in which a mixer body with a droplet-like cross section protrudes into an exhaust gas flow channel formed in a tubular exhaust gas guiding element.
  • the mixer body can be flowed around by exhaust gas flowing in the exhaust gas duct in the manner of an aerofoil and has a plurality of gas discharge openings, via which gas flowing through a gas supply volume inside the mixer body is discharged into the exhaust gas stream flowing around the mixer body.
  • a gas / gas mixer according to the preamble of claim 1 is from DE 10 2013 221 428 A1 known.
  • This gas/gas mixer comprises a first mixer body part arranged in an upstream direction and a second mixer body part arranged in a downstream direction.
  • a volume is formed between these two mixer body parts, into which a liquid or gas can be introduced by means of an injector and can be mixed with an exhaust gas flow passing through this volume.
  • a plurality of through-flow holes are provided in the second mixer body part, through which exhaust gas that may be mixed with a gas or a liquid can leave the volume formed between the two mixer body parts.
  • Flow openings are also formed in the first mixer body part, through which exhaust gas flowing in an exhaust gas flow channel onto this can flow into the volume formed between the two mixer body parts.
  • a gas/gas mixer for introducing gas, for example air or burner exhaust gas, into the exhaust gas stream of an internal combustion engine according to claim 1, comprising an exhaust gas flow channel in an exhaust gas routing element through which exhaust gas can flow, a mixer body arranged in the exhaust gas routing element and having a plurality of of exhaust gas flowing through the exhaust gas flow channel through which exhaust gas flow openings can flow, wherein a gas supply volume through which gas to be introduced into the exhaust gas flow can flow is formed in the mixer body, and wherein the gas supply volume is open to the exhaust gas flow channel via a plurality of gas discharge openings.
  • the gas/gas mixer not only has the gas discharge openings through which the exhaust gas to be introduced into the exhaust gas flow is discharged, but also has exhaust gas flow openings through which the or at least a substantial part of the exhaust gas flowing in the exhaust gas flow channel flows through.
  • the mixer body is plate-like and is arranged in the exhaust gas guide element transversely to a main exhaust gas flow direction of the exhaust gas flowing through the exhaust gas flow channel.
  • the gas supply volume is provided in the mixer body in that the mixer body has a first mixer body part oriented in the exhaust gas guide element in the upstream direction and one in the Exhaust gas routing element in the direction downstream oriented arranged second mixer body part comprises, wherein the gas supply volume is formed substantially between the first mixer body part and the second mixer body part.
  • the first mixer body part can be designed essentially plate-like and the second mixer body part can be designed essentially plate-like.
  • plate-like refers to a structure of the mixer body or the mixer body parts in which they have a significantly smaller thickness than their extent transverse to the thickness direction.
  • a fastening area fixed to the exhaust gas routing element be provided on one of the mixer body parts, preferably the second mixer body part, and that a fastening area fixed to the one mixer body part be provided on the other mixer body part, preferably the first mixer body part second attachment area is provided.
  • the first fastening area can comprise a, preferably essentially cylindrical, fastening edge fixed on an inner peripheral surface of the exhaust gas routing element in an outer peripheral area of one mixer body part
  • the second fastening area can have a, preferably essentially cylindrical, fastening edge fixed on a mixer body part in an outer peripheral area of the other mixer body part.
  • a plurality of throughflow holes are provided in the second mixer body part, and in the first mixer body part one is then assigned to each throughflow hole of the second mixer body part towards the second mixer body part extending and exhaust gas in the direction of the associated flow hole, providing a flow channel of the first mixer body part providing, preferably tubular or funnel-like, flow formation is provided.
  • Efficient mixing of exhaust gas and the gas to be introduced into it can be further supported by forming a gas discharge opening between a through-flow edge area of the second mixer body part surrounding the through-flow hole in the second mixer body part and the through-flow molding of the first mixer body part in at least one, preferably every exhaust gas through-flow opening .
  • the gas discharge openings thus have a ring-like structure and, with this ring-like structure, each bypass a region in which exhaust gas flowing through a respective exhaust gas through-flow opening is guided.
  • At least one gas discharge opening can be provided in the second mixer body part between the through-flow holes provided in the second mixer body part. At least one can continue Gas discharge opening may be provided in the first mixer body part, preferably in the area of at least one flow-through formation.
  • the through-flow formation can rest against a through-flow hole edge area of the second mixer body part surrounding the through-flow hole in the second mixer body part, preferably in such a way that the gas supply volume in the Area of this exhaust gas flow opening is closed against the escape of gas substantially.
  • the first mixer body part is a formed sheet metal part and/or that the second mixer body part is a formed sheet metal part.
  • a gas supply channel guided through a wall of the exhaust gas guiding element can be open to the gas supply volume on an outer peripheral region of the mixer body.
  • Efficient mixing of gas and exhaust gas can further be ensured by arranging the mixer body in the exhaust gas guide element in such a way that exhaust gas in the exhaust gas flow channel in the area of the mixer body essentially only flows through the exhaust gas flow openings. This ensures that essentially all of the exhaust gas flowing in the exhaust gas flow channel flows through the exhaust gas flow openings provided in the mixer body and is thus conducted into an area in which the gas to be introduced into the exhaust gas exits the mixer body.
  • the invention also relates to an exhaust system for an internal combustion engine of a vehicle, comprising a gas/gas mixer with a structure according to the invention.
  • the 1 shows a gas/gas mixer 12 arranged in an exhaust system 10 of an internal combustion engine.
  • the gas/gas mixer 12 comprises a tubular, for example essentially cylindrical, exhaust gas routing element 14 which delimits an exhaust gas flow channel 18 with a tubular wall 16 .
  • exhaust gas A flows essentially in a main exhaust gas flow direction H along the exhaust gas routing element 14.
  • the exhaust gas main flow direction H can essentially also correspond to the longitudinal extension direction or a longitudinal center axis L of the tubular exhaust gas routing element 14 .
  • the mixer body 20 comprises two mixer body parts 22, 24.
  • the first mixer body part 22 is basically arranged in the exhaust gas flow duct 18 in such a way that it is oriented in the upstream direction, so that the exhaust gas A flowing towards the mixer body 20 in the main exhaust gas flow direction H first flows onto the first mixer body part 22 impinges.
  • the second mixer body part 24 is oriented in the exhaust flow passage 18 toward the downstream direction and is thus positioned substantially on the downstream side of the first mixer body part 22 .
  • the two mixer body parts 22, 24 are also plate-like and are provided, for example, as sheet metal parts.
  • the outer peripheral contour of the second mixer body part 24 is adapted to the inner peripheral contour of the wall 16 of the tubular exhaust gas routing element 14 . If the exhaust gas routing element 14 has, for example, a circular inner peripheral contour in the area in which the mixer body 20 is positioned, the outer peripheral contour of the second mixer body part is then advantageously equally circular.
  • the second mixer body part 20 For attachment to the wall 16 of the exhaust gas routing element 14, the second mixer body part 20 has in an outer peripheral region 26 thereof a fastening edge 28 which is bent in the exhaust gas main flow direction H and preferably runs all the way around in the peripheral direction.
  • the fastening edge 18 is fixed by welding 30 to the inner surface of the wall 16 of the exhaust gas routing element 14, so that when the fastening edge 28 is completely circumferential in the circumferential direction, it is not possible for exhaust gas to pass between the wall 16 of the exhaust gas routing element 14 and the second mixer body part 24 is.
  • the first mixer body part 22 is fixed to the upstream side of the plate-like second mixer body part 24 .
  • the first mixer body part 22 has an outer peripheral contour which approximately corresponds to the outer peripheral contour of the second mixer body part 24 or the inner peripheral contour of the exhaust gas routing element, but is dimensioned smaller than the second mixer body part 24.
  • the first mixer body part 24 In its outer peripheral region 32, the first mixer body part 24 has a Main flow direction H bent, in the circumferential direction preferably completely circumferential fastening edge 34. This is fixed by welding 36 on the side of the second mixer body part 24 oriented in the upstream direction.
  • the two mixer body parts 22, 24 could also be designed in such a way that the first mixer body part 22 is dimensioned somewhat larger than the second mixer body part 24 and has a fastening edge 34 that extends to a greater extent in the main exhaust gas flow direction H. This can then encompass the fastening edge 28 of the second mixer body part 24 on its outside, so that the second mixer body part 24 can be inserted into the first mixer body part 22 .
  • the fastening edge 34 of the first mixer body part 22 is fixed by welding to the wall 16 of the exhaust gas routing element 14, and the fastening edge 28 of the second mixer body part 24 is fixed by welding to the fastening edge 34 of the first mixer body part 22 and/or to the wall 16 of the exhaust gas routing element 14.
  • the two fastening edge regions 34, 28 can be dimensioned such that they end approximately in the same region in the exhaust gas main flow direction H and are connected to the wall 16 of the exhaust gas routing element 14 by a joint weld.
  • a gas supply volume 38 is formed between the two mixer body parts 22 , 24 .
  • a gas supply line 40 through the wall 16 of the exhaust gas routing element 14 and the fastening edge 34 of the first mixer body part 22 and thus, for example, in each case firmly and gas-tightly connected by welding.
  • the exhaust gas supply line 40 there is a gas supply channel 42 which opens into the gas supply volume 38 and through which gas G to be introduced into the exhaust gas A is conducted into the gas supply volume 38 .
  • a through-flow formation 50 is provided on the first mixer body part 22 in association with each through-flow hole 48 in the second mixer body part 24 .
  • This can be provided, for example, as a duct and, with its tubular or funnel-like structure, provides a flow channel 52 for the exhaust gas A. Due to the constriction of the flow cross section occurring in the area of the exhaust gas flow openings 44, the exhaust gas A flowing through the exhaust gas flow openings 44 is accelerated as it passes through the exhaust gas flow openings A, so that the flow velocity increases.
  • the first mixer body part 22 is dimensioned or shaped in the area of its flow-through formations 50 such that an annular intermediate space providing a gas discharge opening 56 is formed between the downstream end regions 54 of the flow-through formations 50 and the associated through-flow hole edge regions 46 .
  • the gas G introduced into the gas supply volume 38 exits the gas supply volume via these ring-shaped gas discharge openings 56 38 and thus enters the stream of exhaust gas A flowing through the through-flow formations 50 or in the through-flow channels 52. Due to the fact that the exhaust gas A is accelerated in the area of the exhaust gas through-flow openings 44 and when passing through the through-flow holes 48 or downstream of which a turbulence arises, the gas G introduced into the exhaust gas flow in these areas is efficiently mixed with the exhaust gas A.
  • the through-flow formations 50 are dimensioned or matched to the through-flow holes 48 in such a way that they have smaller dimensions than the through-flow holes 48, particularly in the region of their downstream ends 54, it is ensured that the exhaust gas A flowing through the through-flow channels 52 flows through the through-flow holes 48 is passed through so that no exhaust gas A can get into the gas supply volume 38 via the gas discharge openings 56, even if, as in 1 shown, the through-flow cutouts 50 in the exhaust gas main flow direction H end in front of the second mixer body part 24 and thus already in front of the through-flow holes 48 .
  • the 2 shows a modified embodiment of the exhaust gas mixer 12.
  • the structure corresponds to the structure described above.
  • the two mixer body parts 22, 24 are designed, for example, as plate-like sheet metal parts.
  • the second mixer body part 24 is fixed with its fastening edge 28 to the wall 16 of the exhaust gas routing element 14 by welding 30, and the first mixer body part 22 is fixed with its fastening edge 34 to the second mixer body part 24 by welding 36, so that between the two mixer body parts 22, 24 the Gas supply volume 38 is formed.
  • the flow-through formations 50 are shaped or matched to the flow-through holes 48 assigned to them in such a way that the downstream end regions 54 of the flow-through formations 50 rest against the through-flow edge areas 46 of the respectively assigned flow-through holes 48 .
  • the flow-through formations 50 adjoin the associated flow-through hole edge regions 46 essentially no intermediate space is formed, so that an escape of gas G from the gas supply volume 38 directly in the area of the exhaust gas through-flow openings 44 is essentially not provided is.
  • the flow-through formations 50 can be pressed with their downstream end regions 54 against the assigned through-flow hole edge regions 46 , so that a substantially gas-tight seal is created.
  • gas leaks in these areas caused by manufacturing tolerances are basically harmless, since on the one hand the gas/gas mixer 12 is intended anyway to introduce the gas G into the exhaust gas A, and on the other hand a significant gas leak will not occur in these areas.
  • a material connection of the two mixer body parts 22, 24 in the area of the downstream end areas 54 of the through-flow formations 50 with the through-flow hole edge areas 46 of the second mixer body part 24 can in principle be provided, but is not required.
  • the shape of the two mixer body parts 22, 24 can also have a significant influence on the dimensioning of the mixer body 20.
  • the size of the gas supply volume 38 can be influenced by the length of the flow-through formations 50 or the fastening edge 34 of the first mixer body part 22 .
  • the gas supply volume 38 in the exhaust gas main flow direction H has a greater extent, the mixer body 22 in the embodiment of FIG 2 made flatter by a corresponding shaping of the first mixer body part 22 .
  • Gas discharge openings 56 can thus be connected both to the in 1 illustrated ring-like structure in the area of the exhaust gas flow openings 44, as well as with the 2 shown hole-like structure in the area between the exhaust gas flow openings 44 may be provided.
  • some of the exhaust gas through-flow openings 44 can be designed as shown in FIG 1 shown, i.e. with a gas discharge opening 56 provided in association therewith, while other exhaust gas through-flow openings 44 can be designed as in FIG 2 shown, ie without an associated gas discharge opening.
  • the second mixer body part 24 is shaped in such a way that the through-flow hole edge region 46 surrounding the through-flow hole 48 counter to the exhaust gas main flow direction H is bent, for example, is provided as a passage.
  • the through-flow hole edge region 46 is shaped or dimensioned in such a way that it provides a larger opening cross section than the through-flow molding 50 on the first mixer body part 22.
  • the dimensioning is such that the through-flow molding 50 in the area of the through-flow hole 48 extends into that of the through-flow hole edge area 46 surrounded volume extends and overlaps with the flow hole edge region 46 in the exhaust gas main flow direction A.
  • the ring-like intermediate space formed between the through-flow hole edge region 46, which is bent counter to the exhaust gas main flow direction H, and the through-flow formation 50 provides a gas discharge opening 56 which, as in the embodiment example in FIG 1 , basically has a ring-like shape and via which the gas G supplied via the gas supply volume 38 is introduced into the exhaust gas A flowing through the exhaust gas flow channel 52 in the first mixer body part 22 .
  • a gas discharge opening 56 which, as in the embodiment example in FIG 1 , basically has a ring-like shape and via which the gas G supplied via the gas supply volume 38 is introduced into the exhaust gas A flowing through the exhaust gas flow channel 52 in the first mixer body part 22 .
  • the gas/gas mixer 12 illustrated in the figures may be modified in various aspects without departing from the principles of the present invention.
  • the flow-through formations 50 can also be dimensioned such that they extend into or through the flow-through holes 48 .
  • one or more gas discharge openings 56 can be provided alternatively or additionally in the area of the flow-through formations 50, as is shown in 2 is indicated.
  • the exhaust gas through-flow openings 44 can have a circular opening cross section, for example, but can also be elliptical, oval or provided with a different cross-sectional geometry. The same applies to the Gas discharge openings 56.
  • the two mixer body parts 22, 24 can act as integral components of a component provided by forming a sheet metal blank, which can be folded over itself and then secured to one another in areas, for example by welding.
  • the mixer according to the invention it is possible to introduce gas G into the exhaust gas flow over the entire cross section of the exhaust gas flow channel 18 and to mix it efficiently with the exhaust gas flowing in the exhaust gas flow channel 18 .
  • the gas G to be added to the exhaust gas A can be, for example, the exhaust gas provided by a burner, which can ensure faster heating in a starting phase of the combustion operation of an internal combustion engine when the catalyst arrangement is still cold downstream of the gas/gas mixer.
  • any other type of gas for example air, could also be added to the exhaust gas flow in order to obtain improved operating characteristics in the system areas downstream of the gas/gas mixer 12 .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Description

Die vorliegende Erfindung betrifft einen Gas/Gas-Mischer gemäß dem Oberbegriff des Anspruchs 1, mit welchem Gas in den Abgasstrom einer Brennkraftmaschine eingeleitet werden kann.The present invention relates to a gas/gas mixer according to the preamble of claim 1, with which gas can be introduced into the exhaust gas flow of an internal combustion engine.

Aus der DE 10 2018 108 592 A1 ist ein Gas/Gas-Mischer bekannt, bei welchem ein im Querschnitt tropfenartiger Mischerkörper in einen in einem rohrartigen Abgasführungselement gebildeten Abgasströmungskanal hineinragt. Der Mischerkörper ist nach Art einer Tragfläche von im Abgaskanal strömendem Abgas umströmbar und weist eine Mehrzahl von Gasabgabeöffnungen auf, über welche ein Gaszuführvolumen im Inneren des Mischerkörpers durchströmendes Gas in den den Mischerkörper umströmenden Abgasstrom abgegeben wird.From the DE 10 2018 108 592 A1 a gas/gas mixer is known in which a mixer body with a droplet-like cross section protrudes into an exhaust gas flow channel formed in a tubular exhaust gas guiding element. The mixer body can be flowed around by exhaust gas flowing in the exhaust gas duct in the manner of an aerofoil and has a plurality of gas discharge openings, via which gas flowing through a gas supply volume inside the mixer body is discharged into the exhaust gas stream flowing around the mixer body.

Ein Gas/Gas-Mischer gemäß dem Oberbegriff des Anspruchs 1 ist aus der DE 10 2013 221 428 A1 bekannt. Dieser Gas/Gas-Mischer umfasst ein in Richtung stromaufwärts orientiert angeordnetes erstes Mischerkörperteil und ein in Richtung stromabwärts orientiert angeordnetes zweites Mischerkörperteil. Zwischen diesen beiden Mischerkörperteilen ist ein Volumen gebildet, in welches vermittels eines Injektors eine Flüssigkeit oder Gas eingeleitet werden kann und mit einem dieses Volumen durchsetzenden Abgasstrom vermischt werden kann. In dem zweiten Mischerkörperteil ist eine Mehrzahl von Durchströmlöchern vorgesehen, durch welche hindurch gegebenenfalls mit einem Gas oder einer Flüssigkeit durchmischtes Abgas das zwischen den beiden Mischerkörperteilen gebildete Volumen verlassen kann. Auch in dem ersten Mischerkörperteil sind Durchströmöffnungen ausgebildet, durch welche in einem Abgasströmungskanal auf dieses zu strömendes Abgas in das zwischen den beiden Mischerkörperteilen gebildete Volumen einströmen kann.A gas / gas mixer according to the preamble of claim 1 is from DE 10 2013 221 428 A1 known. This gas/gas mixer comprises a first mixer body part arranged in an upstream direction and a second mixer body part arranged in a downstream direction. A volume is formed between these two mixer body parts, into which a liquid or gas can be introduced by means of an injector and can be mixed with an exhaust gas flow passing through this volume. A plurality of through-flow holes are provided in the second mixer body part, through which exhaust gas that may be mixed with a gas or a liquid can leave the volume formed between the two mixer body parts. Flow openings are also formed in the first mixer body part, through which exhaust gas flowing in an exhaust gas flow channel onto this can flow into the volume formed between the two mixer body parts.

Es ist die Aufgabe der vorliegenden Erfindung, einen Gas/Gas-Mischer zum Einleiten von Gas in den Abgasstrom einer Brennkraftmaschine vorzusehen, mit welchem eine verbesserte Durchmischung von Abgas mit in den Abgasstrom einzuleitendem Gas erreicht werden kann.It is the object of the present invention to provide a gas / gas mixer for introducing gas into the exhaust gas flow of an internal combustion engine, with which a improved mixing of exhaust gas with gas to be introduced into the exhaust gas flow can be achieved.

Erfindungsgemäß wird diese Aufgabe gelöst durch einen Gas/Gas-Mischer zum Einleiten von Gas, beispielsweise Luft oder Brennerabgas, in den Abgasstrom einer Brennkraftmaschine gemäß Anspruch 1, umfassend einen Abgasströmungskanal in einem von Abgas durchströmbaren Abgasführungselement, einen in dem Abgasführungselement angeordneten Mischerkörper mit einer Mehrzahl von im Abgasströmungskanal strömendem Abgas durchströmbaren Abgas-Durchströmöffnungen, wobei in dem Mischerkörper ein von in den Abgasstrom einzuleitendem Gas durchströmbares Gaszuführvolumen gebildet ist, und wobei das Gaszuführvolumen über eine Mehrzahl von Gasabgabeöffnungen zu dem Abgasströmungskanal offen ist.According to the invention, this object is achieved by a gas/gas mixer for introducing gas, for example air or burner exhaust gas, into the exhaust gas stream of an internal combustion engine according to claim 1, comprising an exhaust gas flow channel in an exhaust gas routing element through which exhaust gas can flow, a mixer body arranged in the exhaust gas routing element and having a plurality of of exhaust gas flowing through the exhaust gas flow channel through which exhaust gas flow openings can flow, wherein a gas supply volume through which gas to be introduced into the exhaust gas flow can flow is formed in the mixer body, and wherein the gas supply volume is open to the exhaust gas flow channel via a plurality of gas discharge openings.

Bei dem erfindungsgemäßen Aufbau weist der Gas/Gas-Mischer nicht nur die Gasabgabeöffnungen auf, durch welche hindurch das in den Abgasstrom einzuleitende Abgas abgegeben wird, sondern weist auch Abgas-Durchströmöffnungen auf, durch welche das oder zumindest ein wesentlicher Teil des im Abgasströmungskanal strömenden Abgases hindurchströmt. Dadurch wird beim Hindurchströmen des Abgases durch die Abgas-Durchströmöffnungen an der stromabwärtigen Seite des Mischerkörpers eine Verwirbelung erzeugt, welche eine effiziente Durchmischung des aus den Gasabgabeöffnungen des Mischerkörpers abgegebenen und von dem Abgasstrom mitgetragenen Gases bewirkt.In the construction according to the invention, the gas/gas mixer not only has the gas discharge openings through which the exhaust gas to be introduced into the exhaust gas flow is discharged, but also has exhaust gas flow openings through which the or at least a substantial part of the exhaust gas flowing in the exhaust gas flow channel flows through. As a result, when the exhaust gas flows through the exhaust gas flow openings on the downstream side of the mixer body, turbulence is generated, which causes efficient mixing of the gas discharged from the gas discharge openings of the mixer body and carried by the exhaust gas flow.

Für einen einfach zu realisierenden und eine effiziente Durchströmung des Mischerkörpers mit Abgas herbeiführenden Aufbau wird vorgeschlagen, dass der Mischerkörper plattenartig ausgebildet ist und im Abgasführungselement quer zu einer Abgashauptströmungsrichtung des den Abgasströmungskanal durchströmenden Abgases angeordnet ist.For a structure that is easy to implement and brings about an efficient flow of exhaust gas through the mixer body, it is proposed that the mixer body is plate-like and is arranged in the exhaust gas guide element transversely to a main exhaust gas flow direction of the exhaust gas flowing through the exhaust gas flow channel.

Das Gaszuführvolumen ist in dem Mischerkörper dadurch bereitgestellt, dass der Mischerkörper ein in dem Abgasführungselement in Richtung stromaufwärts orientiert angeordnetes erstes Mischerkörperteil und ein in dem Abgasführungselement in Richtung stromabwärts orientiert angeordnetes zweites Mischerkörperteil umfasst, wobei das Gaszuführvolumen im Wesentlichen zwischen dem ersten Mischerkörperteil und dem zweiten Mischerkörperteil gebildet ist.The gas supply volume is provided in the mixer body in that the mixer body has a first mixer body part oriented in the exhaust gas guide element in the upstream direction and one in the Exhaust gas routing element in the direction downstream oriented arranged second mixer body part comprises, wherein the gas supply volume is formed substantially between the first mixer body part and the second mixer body part.

Dabei können zum Erhalt der plattenartigen Gestalt des Mischerkörpers das erste Mischerkörperteil im Wesentlichen plattenartig ausgebildet sein und das zweite Mischerkörperteil im Wesentlichen plattenartig ausgebildet sein.In order to maintain the plate-like shape of the mixer body, the first mixer body part can be designed essentially plate-like and the second mixer body part can be designed essentially plate-like.

Es ist in diesem Zusammenhang darauf hinzuweisen, dass im Sinne der vorliegenden Erfindung mit dem Ausdruck "plattenartig" eine Struktur des Mischerkörpers bzw. der Mischerkörperteile angesprochen ist, bei welcher diese eine deutlich geringere Dicke aufweisen, als ihre Ausdehnung quer zur Dickenrichtung.It should be pointed out in this context that the expression "plate-like" refers to a structure of the mixer body or the mixer body parts in which they have a significantly smaller thickness than their extent transverse to the thickness direction.

Zur einfach zu realisierenden Festlegung des Mischerkörpers am Abgasführungselement wird vorgeschlagen, dass an einem der Mischerkörperteile, vorzugsweise dem zweiten Mischerkörperteil, ein an dem Abgasführungselement festgelegter Befestigungsbereich vorgesehen ist, und dass an dem anderen Mischerkörperteil, vorzugsweise dem ersten Mischerkörperteil, ein an dem einen Mischerkörperteil festgelegter zweiter Befestigungsbereich vorgesehen ist.In order to fix the mixer body to the exhaust gas routing element in a simple manner, it is proposed that a fastening area fixed to the exhaust gas routing element be provided on one of the mixer body parts, preferably the second mixer body part, and that a fastening area fixed to the one mixer body part be provided on the other mixer body part, preferably the first mixer body part second attachment area is provided.

Dabei kann beispielsweise der erste Befestigungsbereich einen, vorzugsweise im Wesentlichen zylindrischen, an einer Innenumfangsfläche des Abgasführungselements festgelegten Befestigungsrand in einem Außenumfangsbereich des einen Mischerkörperteils umfassen, oder/und der zweite Befestigungsbereich kann einen, vorzugsweise im Wesentlichen zylindrischen, am einen Mischerkörperteil festgelegten Befestigungsrand in einem Außenumfangsbereich des anderen Mischerkörperteils umfassen.In this case, for example, the first fastening area can comprise a, preferably essentially cylindrical, fastening edge fixed on an inner peripheral surface of the exhaust gas routing element in an outer peripheral area of one mixer body part, and/or the second fastening area can have a, preferably essentially cylindrical, fastening edge fixed on a mixer body part in an outer peripheral area of the other mixer body part.

Zum Bereitstellen der Abgas-Durchströmöffnungen ist in dem zweiten Mischerkörperteil eine Mehrzahl von Durchströmlöchern vorgesehen, und in dem ersten Mischerkörperteil ist dann in Zuordnung zu jedem Durchströmloch des zweiten Mischerkörperteils eine auf das zweite Mischerkörperteil sich zu erstreckende und Abgas in Richtung zu dem zugeordneten Durchströmloch leitende, einen Durchströmkanal des ersten Mischerkörperteils bereitstellende, vorzugsweise rohrartige oder trichterartige, Durchströmausformung vorgesehen.To provide the exhaust gas throughflow openings, a plurality of throughflow holes are provided in the second mixer body part, and in the first mixer body part one is then assigned to each throughflow hole of the second mixer body part towards the second mixer body part extending and exhaust gas in the direction of the associated flow hole, providing a flow channel of the first mixer body part providing, preferably tubular or funnel-like, flow formation is provided.

Eine effiziente Durchmischung von Abgas und in dieses einzuleitenden Gas kann weiter dadurch unterstützt werden, dass bei wenigstens einer, vorzugsweise jeder Abgas-Durchströmöffnung eine Gasabgabeöffnung zwischen einem das Durchströmloch im zweiten Mischerkörperteil umgebenden Durchströmloch-Randbereich des zweiten Mischerkörperteils und der Durchströmausformung des ersten Mischerkörperteils gebildet ist. Die Gasabgabeöffnungen weisen damit eine ringartige Struktur auf und umgehen mit dieser ringartigen Struktur jeweils einen Bereich, in welchem eine jeweilige Abgas-Durchströmöffnung durchströmendes Abgas geführt ist.Efficient mixing of exhaust gas and the gas to be introduced into it can be further supported by forming a gas discharge opening between a through-flow edge area of the second mixer body part surrounding the through-flow hole in the second mixer body part and the through-flow molding of the first mixer body part in at least one, preferably every exhaust gas through-flow opening . The gas discharge openings thus have a ring-like structure and, with this ring-like structure, each bypass a region in which exhaust gas flowing through a respective exhaust gas through-flow opening is guided.

Alternativ oder zusätzlich kann wenigstens eine Gasabgabeöffnung in dem zweiten Mischerkörperteil zwischen den im zweiten Mischerkörperteil vorgesehenen Durchströmlöchern vorgesehen sein. Weiter kann wenigstens eine Gasabgabeöffnung in dem ersten Mischerkörperteil, vorzugsweise im Bereich wenigstens einer Durchströmausformung, vorgesehen sein.Alternatively or additionally, at least one gas discharge opening can be provided in the second mixer body part between the through-flow holes provided in the second mixer body part. At least one can continue Gas discharge opening may be provided in the first mixer body part, preferably in the area of at least one flow-through formation.

Dabei kann für eine definierte Einleitung des Gases in den Abgasstrom zwischen den Abgas-Durchströmöffnungen bei wenigstens einer, vorzugsweise jeder Abgas-Durchströmöffnung die Durchströmausformung an einem das Durchströmloch im zweiten Mischerkörperteil umgebenden Durchströmloch-Randbereich des zweiten Mischerkörperteils anliegen, vorzugsweise derart, dass das Gaszuführvolumen im Bereich dieser Abgas-Durchströmöffnung gegen den Austritt von Gas im Wesentlichen abgeschlossen ist.For a defined introduction of the gas into the exhaust gas flow between the exhaust gas through-openings, the through-flow formation can rest against a through-flow hole edge area of the second mixer body part surrounding the through-flow hole in the second mixer body part, preferably in such a way that the gas supply volume in the Area of this exhaust gas flow opening is closed against the escape of gas substantially.

Für einen thermisch stabilen, einfach und kostengünstig zu realisierenden Aufbau wird vorgeschlagen, dass das erste Mischerkörperteil ein Blechumformteil ist, oder/und dass das zweite Mischerkörperteil ein Blechumformteil ist.For a thermally stable structure that is simple and inexpensive to implement, it is proposed that the first mixer body part is a formed sheet metal part and/or that the second mixer body part is a formed sheet metal part.

Zum Zuführen des in den Abgasstrom einzuleitenden Gases kann an einem Außenumfangsbereich des Mischerkörpers ein durch eine Wandung des Abgasführungselements hindurchgeführter Gaszuführkanal zu dem Gaszuführvolumen offen sein.In order to supply the gas to be introduced into the exhaust gas flow, a gas supply channel guided through a wall of the exhaust gas guiding element can be open to the gas supply volume on an outer peripheral region of the mixer body.

Eine effiziente Durchmischung von Gas und Abgas kann weiter dadurch gewährleistet werden, dass der Mischerkörper im Abgasführungselement derart angeordnet ist, dass Abgas im Abgasströmungskanal im Bereich des Mischerkörpers im Wesentlichen nur durch die Abgas-Durchströmöffnungen hindurchdurchströmt. Somit wird gewährleistet, dass im Wesentlichen das gesamte im Abgasströmungskanal strömende Abgas die im Mischerkörper vorgesehenen Abgas-Durchströmöffnungen durchströmt und somit in einen Bereich geleitet wird, in welchem das in das Abgas einzuleitende Gas aus dem Mischerkörper austritt.Efficient mixing of gas and exhaust gas can further be ensured by arranging the mixer body in the exhaust gas guide element in such a way that exhaust gas in the exhaust gas flow channel in the area of the mixer body essentially only flows through the exhaust gas flow openings. This ensures that essentially all of the exhaust gas flowing in the exhaust gas flow channel flows through the exhaust gas flow openings provided in the mixer body and is thus conducted into an area in which the gas to be introduced into the exhaust gas exits the mixer body.

Die Erfindung betrifft ferner eine Abgasanlage für eine Brennkraftmaschine eines Fahrzeugs, umfassend einen Gas/Gas-Mischer mit erfindungsgemäßem Aufbau.The invention also relates to an exhaust system for an internal combustion engine of a vehicle, comprising a gas/gas mixer with a structure according to the invention.

Die vorliegende Erfindung wird nachfolgend mit Bezug auf die beiliegenden Figuren detailliert beschrieben. Es zeigt:

Fig. 1
eine Teil-Längsschnittansicht eines Gas/Gas-Mischers in einer Abgasanlage einer Brennkraftmaschine;
Fig. 2
eine der Fig. 1 entsprechende Darstellung einer alternativen Ausgestaltungsart des Gas/Gas-Mischers;
Fig. 3
eine Darstellung einer alternativen Ausgestaltungsart eines Gas/Gas-Mischers im Bereich einer Abgas-Durchströmöffnung.
The present invention is described in detail below with reference to the attached figures. It shows:
1
a partial longitudinal sectional view of a gas / gas mixer in an exhaust system of an internal combustion engine;
2
one of the 1 Corresponding representation of an alternative embodiment of the gas/gas mixer;
3
a representation of an alternative embodiment of a gas/gas mixer in the area of an exhaust gas flow opening.

Die Fig. 1 zeigt einen in einer Abgasanlage 10 einer Brennkraftmaschine angeordneten Gas/Gas-Mischer 12. Der Gas/Gas-Mischer 12 umfasst ein rohrartiges, beispielsweise im Wesentlichen zylindrisches Abgasführungselement 14, das mit einer rohrartigen Wandung 16 einen Abgasströmungskanal 18 umgrenzt. Im Abgasströmungskanal 18 strömt Abgas A im Wesentlichen in einer Abgas-Hauptströmungsrichtung H entlang des Abgasführungselements 14. Es ist darauf hinzuweisen, dass lokal von der Abgas-Hauptströmungsrichtung H abweichende Strömungsrichtungen vorhanden sein können. Grundsätzlich kann die Abgas-Hauptströmungsrichtung H im Wesentlichen auch der Längserstreckungsrichtung bzw. einer Längsmittenachse L des rohrartigen Abgasführungselements 14 entsprechen.The 1 shows a gas/gas mixer 12 arranged in an exhaust system 10 of an internal combustion engine. The gas/gas mixer 12 comprises a tubular, for example essentially cylindrical, exhaust gas routing element 14 which delimits an exhaust gas flow channel 18 with a tubular wall 16 . In the exhaust gas flow channel 18, exhaust gas A flows essentially in a main exhaust gas flow direction H along the exhaust gas routing element 14. It should be noted that flow directions that deviate locally from the main exhaust gas flow direction H can be present. In principle, the exhaust gas main flow direction H can essentially also correspond to the longitudinal extension direction or a longitudinal center axis L of the tubular exhaust gas routing element 14 .

Der Gas/Gas-Mischer 12 umfasst in dem Abgasführungselement 14 einen Mischerkörper 20. Der Mischerkörper 20 ist grundsätzlich im Wesentlichen plattenartig ausgebildet, was bedeutet, dass seine Ausdehnung beispielsweise quer zur Abgas-Hauptströmungsrichtung H bzw. zur Längsmittenachse L deutlich größer ist, als seine Ausdehnung in der Abgas-Hauptströmungsrichtung H. Der Mischerkörper 20 ist im Abgasführungselement 14 bzw. im Abgasströmungskanal 18 im Wesentlichen quer bzw. orthogonal zur Abgas-Hauptströmungsrichtung H angeordnet, was bedeutet, dass der Mischerkörper 20 mit seiner Dickenrichtung bzw. Dickenausdehnung im Wesentlichen in der Abgas-Hauptströmungsrichtung H bzw. in Richtung der Längsmittenachse L orientiert ist.The gas/gas mixer 12 comprises a mixer body 20 in the exhaust gas routing element 14. The mixer body 20 is basically designed essentially like a plate, which means that its extent, for example transverse to the exhaust gas main flow direction H or to the longitudinal central axis L, is significantly greater than its Expansion in the exhaust gas main flow direction H. The mixer body 20 is arranged in the exhaust gas guide element 14 or in the exhaust gas flow channel 18 substantially transversely or orthogonally to the exhaust gas main flow direction H, which means that the mixer body 20 with its thickness direction or thickness extension is oriented essentially in the exhaust gas main flow direction H or in the direction of the longitudinal central axis L.

Der Mischerkörper 20 umfasst zwei Mischerkörperteile 22, 24. Das erste Mischerkörperteil 22 ist im Abgasströmungskanal 18 grundsätzlich so angeordnet, dass es in Richtung stromaufwärts orientiert ist, so dass das in der Abgas-Hauptströmungsrichtung H auf den Mischerkörper 20 zu strömende Abgas A zunächst auf das erste Mischerkörperteil 22 auftrifft. Das zweite Mischerkörperteil 24 ist im Abgasströmungskanal 18 in Richtung stromabwärts orientiert und ist somit im Wesentlichen an der stromabwärtigen Seite des ersten Mischerkörperteils 22 positioniert. Auch die beiden Mischerkörperteile 22, 24 sind plattenartig ausgebildet und sind beispielsweise als Blechumformteile bereitgestellt.The mixer body 20 comprises two mixer body parts 22, 24. The first mixer body part 22 is basically arranged in the exhaust gas flow duct 18 in such a way that it is oriented in the upstream direction, so that the exhaust gas A flowing towards the mixer body 20 in the main exhaust gas flow direction H first flows onto the first mixer body part 22 impinges. The second mixer body part 24 is oriented in the exhaust flow passage 18 toward the downstream direction and is thus positioned substantially on the downstream side of the first mixer body part 22 . The two mixer body parts 22, 24 are also plate-like and are provided, for example, as sheet metal parts.

Das zweite Mischerkörperteil 24 ist in seiner Außenumfangskontur an die Innenumfangskontur der Wandung 16 des rohrartigen Abgasführungselements 14 angepasst. Weist das Abgasführungselement 14 in dem Bereich, in welchem der Mischerkörper 20 positioniert ist, beispielsweise eine kreisrunde Innenumfangskontur auf, ist dann vorteilhafterweise die Außenumfangskontur des zweiten Mischerkörperteils gleichermaßen kreisförmig.The outer peripheral contour of the second mixer body part 24 is adapted to the inner peripheral contour of the wall 16 of the tubular exhaust gas routing element 14 . If the exhaust gas routing element 14 has, for example, a circular inner peripheral contour in the area in which the mixer body 20 is positioned, the outer peripheral contour of the second mixer body part is then advantageously equally circular.

Zur Festlegung an der Wandung 16 des Abgasführungselements 14 weist das zweite Mischerkörperteil 20 in einem Außenumfangsbereich 26 desselben einen in der Abgas-Hauptströmungsrichtung H abgebogenen, in Umfangsrichtung vorzugsweise vollständig umlaufenden Befestigungsrand 28 auf. In einem Endbereich ist der Befestigungsrand 18 durch Verschweißung 30 an der Innenoberfläche der Wandung 16 des Abgasführungselements 14 festgelegt, so dass bei in Umfangsrichtung vollständig umlaufender Ausgestaltung des Befestigungsrands 28 ein Durchtritt von Abgas zwischen der Wandung 16 des Abgasführungselements 14 und dem zweiten Mischerkörperteil 24 nicht möglich ist.For attachment to the wall 16 of the exhaust gas routing element 14, the second mixer body part 20 has in an outer peripheral region 26 thereof a fastening edge 28 which is bent in the exhaust gas main flow direction H and preferably runs all the way around in the peripheral direction. In one end region, the fastening edge 18 is fixed by welding 30 to the inner surface of the wall 16 of the exhaust gas routing element 14, so that when the fastening edge 28 is completely circumferential in the circumferential direction, it is not possible for exhaust gas to pass between the wall 16 of the exhaust gas routing element 14 and the second mixer body part 24 is.

Es ist darauf hinzuweisen, dass grundsätzlich der Befestigungsrand 28 auch mit mehreren in der Abgas-Hauptströmungsrichtung H abgebogenen und mit Abstand zueinander vorgesehenen und beispielsweise jeweils durch Verschweißung am Abgasführungselement 14 festgelegten Befestigungsrandlaschen ausgebildet sein könnte.It should be pointed out that, in principle, the fastening edge 28 can also be provided with a plurality of bends in the exhaust gas main flow direction H and spaced from one another and, for example, in each case by welding Exhaust gas guide element 14 fixed fastening edge tabs could be formed.

Das erste Mischerkörperteil 22 ist an der in Richtung stromaufwärts orientierten Seite des plattenartigen zweiten Mischerkörperteils 24 festgelegt. Das erste Mischerkörperteil 22 weist eine Außenumfangskontur auf, welche näherungsweise der Außenumfangskontur des zweiten Mischerkörperteils 24 bzw. der Innenumfangskontur des Abgasführungselements entspricht, ist jedoch kleiner dimensioniert, als das zweite Mischerkörperteil 24. In seinem Außenumfangsbereich 32 weist das erste Mischerkörperteil 24 einen in der Abgas-Hauptströmungsrichtung H abgebogenen, im Umfangsrichtung vorzugsweise vollständig umlaufenden Befestigungsrand 34 auf. Dieser ist durch Verschweißung 36 an der in Richtung stromaufwärts orientierten Seite des zweiten Mischerkörperteils 24 festgelegt.The first mixer body part 22 is fixed to the upstream side of the plate-like second mixer body part 24 . The first mixer body part 22 has an outer peripheral contour which approximately corresponds to the outer peripheral contour of the second mixer body part 24 or the inner peripheral contour of the exhaust gas routing element, but is dimensioned smaller than the second mixer body part 24. In its outer peripheral region 32, the first mixer body part 24 has a Main flow direction H bent, in the circumferential direction preferably completely circumferential fastening edge 34. This is fixed by welding 36 on the side of the second mixer body part 24 oriented in the upstream direction.

Es ist darauf hinzuweisen, dass die beiden Mischerkörperteile 22, 24 auch so gestaltet sein könnten, dass das erste Mischerkörperteil 22 etwas größer dimensioniert ist, als das zweite Mischerkörperteil 24 und einen in der Abgas-Hauptströmungsrichtung H in größerem Ausmaß sich erstreckenden Befestigungsrand 34 aufweist. Dieser kann dann den Befestigungsrand 28 des zweiten Mischerkörperteils 24 an seiner Außenseite umgreifen, so dass das zweite Mischerkörperteil 24 in das erste Mischerkörperteil 22 eingesetzt werden kann. Der Befestigungsrand 34 des ersten Mischerkörperteils 22 wird durch Verschweißung an der Wandung 16 des Abgasführungselements 14 festgelegt, und der Befestigungsrand 28 des zweiten Mischerkörperteils 24 wird durch Verschweißung an dem Befestigungsrand 34 des ersten Mischerkörperteils 22 oder/und an der Wandung 16 des Abgasführungselements 14 festgelegt. Beispielsweise können die beiden Befestigungsrandbereiche 34, 28 so dimensioniert sein, dass sie in der Abgas-Hauptströmungsrichtung H näherungsweise im gleichen Bereich enden und durch eine gemeinsame Verschweißung an die Wandung 16 des Abgasführungselements 14 angebunden sind.It should be pointed out that the two mixer body parts 22, 24 could also be designed in such a way that the first mixer body part 22 is dimensioned somewhat larger than the second mixer body part 24 and has a fastening edge 34 that extends to a greater extent in the main exhaust gas flow direction H. This can then encompass the fastening edge 28 of the second mixer body part 24 on its outside, so that the second mixer body part 24 can be inserted into the first mixer body part 22 . The fastening edge 34 of the first mixer body part 22 is fixed by welding to the wall 16 of the exhaust gas routing element 14, and the fastening edge 28 of the second mixer body part 24 is fixed by welding to the fastening edge 34 of the first mixer body part 22 and/or to the wall 16 of the exhaust gas routing element 14. For example, the two fastening edge regions 34, 28 can be dimensioned such that they end approximately in the same region in the exhaust gas main flow direction H and are connected to the wall 16 of the exhaust gas routing element 14 by a joint weld.

Zwischen den beiden Mischerkörperteilen 22, 24 ist ein Gaszuführvolumen 38 gebildet. In einem Umfangsbereich ist eine Gaszuführleitung 40 durch die Wandung 16 des Abgasführungselements 14 und den Befestigungsrand 34 des ersten Mischerkörperteils 22 hindurchgeführt und damit beispielsweise jeweils durch Verschweißung fest und gasdicht verbunden. In der Abgaszuführleitung 40 ist ein in das Gaszuführvolumen 38 einmündender Gaszuführkanal 42 bereitgestellt, durch welchen hindurch in das Abgas A einzuleitendes Gas G in das Gaszuführvolumen 38 geleitet wird.A gas supply volume 38 is formed between the two mixer body parts 22 , 24 . In a peripheral area is a gas supply line 40 through the wall 16 of the exhaust gas routing element 14 and the fastening edge 34 of the first mixer body part 22 and thus, for example, in each case firmly and gas-tightly connected by welding. In the exhaust gas supply line 40 there is a gas supply channel 42 which opens into the gas supply volume 38 and through which gas G to be introduced into the exhaust gas A is conducted into the gas supply volume 38 .

Der Mischerkörper 20 weist eine Mehrzahl von Abgas-Durchströmöffnungen 44 auf, durch welche hindurch das in der Abgas-Hauptströmungsrichtung H auf den Mischerkörper 20 bzw. das erste Mischerkörperteil 22 zu strömende Abgas A durch den Mischerkörper 20 hindurchströmen kann. Zum Bereitstellen der Abgas-Durchströmöffnungen 44, die am Mischerkörper 20 beispielsweise in einem regelmäßigen Muster verteilt angeordnet sein können, weist das zweite Mischerkörperteil 24 eine Mehrzahl von von einem Durchströmloch-Randbereich 46 umgebenen Durchströmlöchern 48 auf. Beispielsweise können die Durchströmlöcher 48 eine kreisartige Kontur aufweisen.The mixer body 20 has a plurality of exhaust gas flow openings 44 through which the exhaust gas A flowing in the exhaust gas main flow direction H onto the mixer body 20 or the first mixer body part 22 can flow through the mixer body 20 . The second mixer body part 24 has a plurality of through-flow holes 48 surrounded by a through-flow hole edge area 46 to provide the exhaust gas through-flow openings 44 , which can be distributed in a regular pattern on the mixer body 20 , for example. For example, the flow holes 48 can have a circular contour.

In Zuordnung zu jedem Durchströmloch 48 im zweiten Mischerkörperteil 24 ist am ersten Mischerkörperteil 22 eine Durchströmausformung 50 vorgesehen. Diese kann beispielsweise als Durchzug bereitgestellt werden und stellt mit ihrer rohrartigen bzw. trichterartigen Struktur einen Durchströmkanal 52 für das Abgas A bereit. Aufgrund der im Bereich der Abgas-Durchströmungsöffnungen 44 auftretenden Einschnürung des Strömungsquerschnitts wird das durch die Abgas-Durchströmöffnungen 44 hindurch strömende Abgas A beim Hindurchtritt durch die Abgas-Durchströmöffnungen A beschleunigt, so dass die Strömungsgeschwindigkeit zunimmt.A through-flow formation 50 is provided on the first mixer body part 22 in association with each through-flow hole 48 in the second mixer body part 24 . This can be provided, for example, as a duct and, with its tubular or funnel-like structure, provides a flow channel 52 for the exhaust gas A. Due to the constriction of the flow cross section occurring in the area of the exhaust gas flow openings 44, the exhaust gas A flowing through the exhaust gas flow openings 44 is accelerated as it passes through the exhaust gas flow openings A, so that the flow velocity increases.

Das erste Mischerkörperteil 22 ist im Bereich seiner Durchströmausformungen 50 so dimensioniert bzw. geformt, dass zwischen den stromabwärtigen Endbereichen 54 der Durchströmausformungen 50 und den zugehörigen Durchströmloch-Randbereichen 46 jeweils ein eine Gasabgabeöffnung 56 bereitstellender ringartiger Zwischenraum gebildet ist. Über diese ringartig gestalteten Gasabgabeöffnungen 56 tritt das in das Gaszuführvolumen 38 eingeleitete Gas G aus dem Gaszuführvolumen 38 aus und gelangt somit in den Strom des durch die Durchströmausformungen 50 bzw. in den Durchströmkanälen 52 strömenden Abgases A. Aufgrund des Umstandes, dass das Abgas A im Bereich der Abgas-Durchströmöffnungen 44 beschleunigt wird und beim Hindurchtritt durch die Durchströmlöcher 48 bzw. stromabwärts davon eine Verwirbelung entsteht, wird das in diesen Bereichen in den Abgasstrom eingeleitete Gas G effizient mit dem Abgas A durchmischt. Da die Durchströmausformungen 50 so dimensioniert bzw. auf die Durchströmlöcher 48 abgestimmt sind, dass diese insbesondere im Bereich ihrer stromabwärtigen Enden 54 eine kleinere Abmessung aufweisen, als die Durchströmlöcher 48, ist gewährleistet, dass das durch die Durchströmkanäle 52 hindurchströmende Abgas A so durch die Durchströmlöcher 48 hindurchgeleitet wird, dass kein Abgas A über die Gasabgabeöffnungen 56 in das Gaszuführvolumen 38 gelangen kann, auch wenn, wie in Fig. 1 dargestellt, die Durchströmaussparungen 50 in der Abgas-Hauptströmungsrichtung H vor dem zweiten Mischerkörperteil 24 und somit bereits vor den Durchströmlöchern 48 enden. Vielmehr wird aufgrund der vergleichsweise hohen Strömungsgeschwindigkeit des Abgases A im Bereich der Durchströmkanäle 52 ein Saugpumpeneffekt generiert, welcher das in dem Abgaszuführvolumen 38 vorhandene Gas G unabhängig von einem möglicherweise vorhandenen Gasüberdruck in den Strom des die Durchströmkanäle 52 durchströmenden Abgases A saugt.The first mixer body part 22 is dimensioned or shaped in the area of its flow-through formations 50 such that an annular intermediate space providing a gas discharge opening 56 is formed between the downstream end regions 54 of the flow-through formations 50 and the associated through-flow hole edge regions 46 . The gas G introduced into the gas supply volume 38 exits the gas supply volume via these ring-shaped gas discharge openings 56 38 and thus enters the stream of exhaust gas A flowing through the through-flow formations 50 or in the through-flow channels 52. Due to the fact that the exhaust gas A is accelerated in the area of the exhaust gas through-flow openings 44 and when passing through the through-flow holes 48 or downstream of which a turbulence arises, the gas G introduced into the exhaust gas flow in these areas is efficiently mixed with the exhaust gas A. Since the through-flow formations 50 are dimensioned or matched to the through-flow holes 48 in such a way that they have smaller dimensions than the through-flow holes 48, particularly in the region of their downstream ends 54, it is ensured that the exhaust gas A flowing through the through-flow channels 52 flows through the through-flow holes 48 is passed through so that no exhaust gas A can get into the gas supply volume 38 via the gas discharge openings 56, even if, as in 1 shown, the through-flow cutouts 50 in the exhaust gas main flow direction H end in front of the second mixer body part 24 and thus already in front of the through-flow holes 48 . Rather, due to the comparatively high flow velocity of the exhaust gas A in the area of the through-flow channels 52, a suction pump effect is generated, which sucks the gas G present in the exhaust-gas supply volume 38 into the flow of the exhaust gas A flowing through the through-flow channels 52, regardless of any excess gas pressure that may be present.

Die Fig. 2 zeigt eine abgewandelte Ausgestaltungsart des Abgasmischers 12. Hinsichtlich des grundsätzlichen Aufbaus des Mischerkörpers 20 mit seinen beiden Mischerkörperteilen 22, 24 entspricht der Aufbau dem vorangehend beschriebenen Aufbau. Auch bei dieser Ausgestaltung sind die beiden Mischerkörperteile 22, 24 beispielsweise als Blechumformteile plattenartig ausgebildet. Das zweite Mischerkörperteil 24 ist mit seinem Befestigungsrand 28 durch Verschweißung 30 an der Wandung 16 des Abgasführungselements 14 festgelegt, und das erste Mischerkörperteil 22 ist mit seinem Befestigungsrand 34 durch Verschweißung 36 am zweiten Mischerkörperteil 24 festgelegt, so dass zwischen den beiden Mischerkörperteilen 22, 24 das Gaszuführvolumen 38 gebildet ist.The 2 shows a modified embodiment of the exhaust gas mixer 12. With regard to the basic structure of the mixer body 20 with its two mixer body parts 22, 24, the structure corresponds to the structure described above. In this embodiment, too, the two mixer body parts 22, 24 are designed, for example, as plate-like sheet metal parts. The second mixer body part 24 is fixed with its fastening edge 28 to the wall 16 of the exhaust gas routing element 14 by welding 30, and the first mixer body part 22 is fixed with its fastening edge 34 to the second mixer body part 24 by welding 36, so that between the two mixer body parts 22, 24 the Gas supply volume 38 is formed.

Bei der in Fig. 2 dargestellten Ausgestaltungsform sind die Durchströmausformungen 50 so geformt bzw. auf die diesen jeweils zugeordneten Durchströmlöcher 48 abgestimmt, dass die stromabwärtigen Endbereiche 54 der Durchströmausformungen 50 an den Durchströmloch-Randbereichen 46 der jeweils zugeordneten Durchströmlöcher 48 anliegen. Es ist somit in dem Bereich, in welchem die Durchströmausformungen 50 an die zugeordneten Durchströmloch-Randbereiche 46 angrenzen, im Wesentlichen kein Zwischenraum gebildet, so dass ein Austritt von Gas G aus dem Gaszuführvolumen 38 unmittelbar im Bereich der Abgas-Durchströmöffnungen 44 im Wesentlichen nicht vorgesehen ist. Beispielsweise können die Durchströmausformungen 50 beim Verbinden des ersten Mischerkörperteils 22 mit dem zweiten Mischerkörperteil 24 mit ihren stromabwärtigen Endbereichen 54 gegen die zugeordneten Durchströmloch-Randbereiche 46 gepresst werden, so dass ein im Wesentlichen gasdichter Abschluss entsteht. Durch Fertigungstoleranzen bedingte Gasleckagen in diesen Bereichen sind jedoch grundsätzlich unschädlich, da einerseits der Gas/Gas-Mischer 12 ohnehin dafür vorgesehen ist, das Gas G in das Abgas A einzuleiten, und da andererseits eine wesentliche Gasleckage in diesen Bereichen nicht auftreten wird. Eine materialschlüssige Verbindung der beiden Mischerkörperteile 22, 24 im Bereich der stromabwärtigen Endbereiche 54 der Durchströmausformungen 50 mit den Durchströmloch-Randbereichen 46 des zweiten Mischerkörperteils 24 kann grundsätzlich zwar vorgesehen sein, ist jedoch nicht erforderlich.At the in 2 In the embodiment shown, the flow-through formations 50 are shaped or matched to the flow-through holes 48 assigned to them in such a way that the downstream end regions 54 of the flow-through formations 50 rest against the through-flow edge areas 46 of the respectively assigned flow-through holes 48 . In the area in which the flow-through formations 50 adjoin the associated flow-through hole edge regions 46, essentially no intermediate space is formed, so that an escape of gas G from the gas supply volume 38 directly in the area of the exhaust gas through-flow openings 44 is essentially not provided is. For example, when the first mixer body part 22 is connected to the second mixer body part 24 , the flow-through formations 50 can be pressed with their downstream end regions 54 against the assigned through-flow hole edge regions 46 , so that a substantially gas-tight seal is created. However, gas leaks in these areas caused by manufacturing tolerances are basically harmless, since on the one hand the gas/gas mixer 12 is intended anyway to introduce the gas G into the exhaust gas A, and on the other hand a significant gas leak will not occur in these areas. A material connection of the two mixer body parts 22, 24 in the area of the downstream end areas 54 of the through-flow formations 50 with the through-flow hole edge areas 46 of the second mixer body part 24 can in principle be provided, but is not required.

In dem zweiten Mischerkörperteil 24 sind in Bereichen zwischen den Durchströmlöchern 48 die hier gleichermaßen lochartig ausgebildeten Gasbabgabeöffnungen 56 vorgesehen. Diese können, ebenso wie die Durchströmlöcher 48, in einem regelmäßigen Muster vorgesehen sein, um eine über den gesamten Querschnitt näherungsweise gleichmäßige Einleitung des Gases G in das Abgas A zu erreichen. Unter Berücksichtigung des Umstandes, dass die Strömungsgeschwindigkeit und damit der Durchsatz nahe der Wandung 16 kleiner sein wird, als im zentralen Bereich des Abgasströmungskanals 18, kann bei allen erfindungsgemäßen Ausgestaltungen vorgesehen sein, dass die Dichte der Abgas-Durchströmöffnungen 44 bzw. die durch die Abgas-Durchströmöffnungen 44 bereitgestellte Gesamt-Durchtrittsquerschnittsfläche im zentralen Bereich des Abgasströmungskanals 18 größer ist, als in einem der Wandung 16 nahen Bereich bzw. von der Wandung 16 zum zentralen Bereich hin zunimmt. Dies kann auch bei den Gasabgabeöffnungen 56 vorgesehen sein, so dass dort, wo ein besonders großer Anteil des Abgases A strömt, auch ein großer Anteil des Gases G in das Abgas A eingeleitet wird.In the second mixer body part 24 , the gas discharge openings 56 , which are designed here in the same way as holes, are provided in regions between the through-flow holes 48 . Like the flow holes 48, these can be provided in a regular pattern in order to achieve an approximately uniform introduction of the gas G into the exhaust gas A over the entire cross section. Taking into account the fact that the flow velocity and thus the throughput will be lower near the wall 16 than in the central area of the exhaust gas flow channel 18, it can be provided in all configurations according to the invention that the density of the exhaust gas flow openings 44 or through the exhaust gas -Throughflow openings 44 provided total passage cross-sectional area in the central area of the Exhaust gas flow channel 18 is larger than increases in an area close to the wall 16 or from the wall 16 to the central area. This can also be provided for the gas discharge openings 56, so that a large proportion of the gas G is also introduced into the exhaust gas A where a particularly large proportion of the exhaust gas A flows.

Es ist darauf hinzuweisen, dass, was ein Vergleich der Fig. 1 und 2 deutlich zeigt, durch die Formgebung der beiden Mischerkörperteile 22, 24 auch ein wesentlicher Einfluss auf die Dimensionierung des Mischerkörpers 20 genommen werden kann. So kann die Größe des Gaszuführvolumens 38 beispielsweise durch die Länge der Durchströmausformungen 50 bzw. des Befestigungsrands 34 des ersten Mischerkörperteils 22 beeinflusst werden. Während bei dem in Fig. 1 dargestellten Ausgestaltungsbeispiel das Gaszuführvolumen 38 in der Abgas-Hauptströmungsrichtung H eine größere Ausdehnung aufweist, ist der Mischerkörper 22 in der Ausgestaltungsform der Fig. 2 durch eine entsprechende Formgebung des ersten Mischerkörperteils 22 flacher gestaltet.It should be noted that what a comparison of Figures 1 and 2 clearly shows that the shape of the two mixer body parts 22, 24 can also have a significant influence on the dimensioning of the mixer body 20. For example, the size of the gas supply volume 38 can be influenced by the length of the flow-through formations 50 or the fastening edge 34 of the first mixer body part 22 . While at the in 1 illustrated embodiment, the gas supply volume 38 in the exhaust gas main flow direction H has a greater extent, the mixer body 22 in the embodiment of FIG 2 made flatter by a corresponding shaping of the first mixer body part 22 .

Weiter ist darauf hinzuweisen, dass selbstverständlich die in den Fig. 1 und 2 dargestellten Ausgestaltungsformen miteinander kombiniert sein können. So können Gasabgabeöffnungen 56 sowohl mit der in Fig. 1 dargestellten ringartigen Struktur im Bereich der Abgas-Durchströmöffnungen 44, als auch mit der in Fig. 2 dargestellten lochartigen Struktur im Bereich zwischen den Abgas-Durchströmöffnungen 44 vorgesehen sein. Bei dieser Ausgestaltung können beispielsweise einige der Abgas-Durchströmöffnungen 44 so ausgebildet sein, wie in Fig. 1 dargestellt, also mit in Zuordnung dazu vorgesehener Gasabgabeöffnung 56, während andere Abgas-Durchströmöffnungen 44 so ausgebildet sein können, wie in Fig. 2 dargestellt, also ohne zugeordneter Gasabgabeöffnung.It should also be pointed out that, of course, the Figures 1 and 2 illustrated embodiments can be combined with each other. Gas discharge openings 56 can thus be connected both to the in 1 illustrated ring-like structure in the area of the exhaust gas flow openings 44, as well as with the 2 shown hole-like structure in the area between the exhaust gas flow openings 44 may be provided. In this configuration, for example, some of the exhaust gas through-flow openings 44 can be designed as shown in FIG 1 shown, i.e. with a gas discharge opening 56 provided in association therewith, while other exhaust gas through-flow openings 44 can be designed as in FIG 2 shown, ie without an associated gas discharge opening.

Eine Abwandlung des Gas/Gas-Mischers insbesondere hinsichtlich der Ausgestaltung im Bereich der Abgas-Durchströmöffnungen 44 ist in Fig. 3 dargestellt. Im Bereich der in Fig. 3 zu erkennenden Abgas-Durchströmöffnung 44 ist das zweite Mischerkörperteil 24 so geformt, dass der das Durchströmloch 48 umgebende Durchströmloch-Randbereich 46 entgegen der Abgas-Hauptströmungsrichtung H abgebogen ist, beispielsweise als Durchzug bereitgestellt ist. Der Durchströmloch-Randbereich 46 ist so geformt bzw. dimensioniert, dass er einen größeren Öffnungsquerschnitt bereitstellt, als die Durchströmausformung 50 am ersten Mischerkörperteil 22. Insbesondere ist die Dimensionierung derart, dass die Durchströmausformung 50 sich im Bereich des Durchströmlochs 48 in das vom Durchströmloch-Randbereich 46 umgebene Volumen hineinerstreckt und sich mit dem Durchströmloch-Randbereich 46 in der Abgas-Hauptströmungsrichtung A überlappt.A modification of the gas/gas mixer, in particular with regard to the design in the area of the exhaust gas flow openings 44, is in 3 shown. In the area of the in 3 The exhaust gas through-flow opening 44 to be seen, the second mixer body part 24 is shaped in such a way that the through-flow hole edge region 46 surrounding the through-flow hole 48 counter to the exhaust gas main flow direction H is bent, for example, is provided as a passage. The through-flow hole edge region 46 is shaped or dimensioned in such a way that it provides a larger opening cross section than the through-flow molding 50 on the first mixer body part 22. In particular, the dimensioning is such that the through-flow molding 50 in the area of the through-flow hole 48 extends into that of the through-flow hole edge area 46 surrounded volume extends and overlaps with the flow hole edge region 46 in the exhaust gas main flow direction A.

Der zwischen dem entgegen zur Abgas-Hauptströmungsrichtung H abgebogenen Durchströmloch-Randbereich 46 und der Durchströmausformung 50 gebildete ringartige Zwischenraum stellt eine Gasabgabeöffnung 56 bereit, welche, so wie im Ausgestaltungsbeispiel der Fig. 1, grundsätzlich eine ringartige Gestalt aufweist und über welche das über das Gaszuführvolumen 38 zugeführte Gas G in das den Abgasströmungskanal 52 im ersten Mischerkörperteil 22 durchströmende Abgas A eingeleitet wird. Auch bei dieser Ausgestaltung ist aufgrund des Umstandes, dass die in der Abgas-Hauptströmungsrichtung H sich erstreckende Durchströmausformung 50 in den entgegengesetzt zur Abgas-Hauptströmungsrichtung H sich erstreckenden Durchströmloch-Randbereich 46 bzw. das von diesem umgebene Volumen eingreift, ein Eintritt von Abgas A in das Gaszuführvolumen 38 ausgeschlossen.The ring-like intermediate space formed between the through-flow hole edge region 46, which is bent counter to the exhaust gas main flow direction H, and the through-flow formation 50 provides a gas discharge opening 56 which, as in the embodiment example in FIG 1 , basically has a ring-like shape and via which the gas G supplied via the gas supply volume 38 is introduced into the exhaust gas A flowing through the exhaust gas flow channel 52 in the first mixer body part 22 . In this configuration, too, due to the fact that the through-flow formation 50 extending in the main exhaust gas flow direction H engages in the through-flow hole edge area 46 extending opposite to the main exhaust gas flow direction H or in the volume surrounded by this, exhaust gas A is prevented from entering the gas supply volume 38 excluded.

Es ist darauf hinzuweisen, dass der in den Figuren dargestellte Gas/Gas-Mischer 12 in verschiedensten Aspekten abgewandelt werden kann, ohne von den Prinzipien der vorliegenden Erfindung abzuweichen. So können beispielsweise bei der in Fig. 1 dargestellten Ausgestaltung die Durchströmausformungen 50 auch so dimensioniert sein, dass sie sich in die Durchströmlöcher 48 hinein bzw. durch diese hindurch erstrecken. Bei allen Ausgestaltungsformen können alternativ oder zusätzlich auch im Bereich der Durchströmausformungen 50 jeweils eine oder mehrere Gasabgabeöffnungen 56 vorgesehen sein, so wie dies in Fig. 2 angedeutet ist.It should be understood that the gas/gas mixer 12 illustrated in the figures may be modified in various aspects without departing from the principles of the present invention. For example, at the in 1 illustrated embodiment, the flow-through formations 50 can also be dimensioned such that they extend into or through the flow-through holes 48 . In all of the configurations, one or more gas discharge openings 56 can be provided alternatively or additionally in the area of the flow-through formations 50, as is shown in 2 is indicated.

Die Abgas-Durchströmöffnungen 44 können beispielsweise einen kreisrunden Öffnungsquerschnitt aufweisen, können aber auch elliptisch, oval oder mit anderer Querschnittsgeometrie bereitgestellt sein. Entsprechendes gilt auch für die Gasabgabeöffnungen 56. Weiter können die beiden Mischerkörperteile 22, 24 als integrale Bestandteile eines durch Umformen eines Blechrohlings bereitgestellten Bauteils vorgehen sein, die über sich gefaltet und dann bereichsweise z.B. durch Verschweißung aneinander festgelegt sein können.The exhaust gas through-flow openings 44 can have a circular opening cross section, for example, but can also be elliptical, oval or provided with a different cross-sectional geometry. The same applies to the Gas discharge openings 56. Furthermore, the two mixer body parts 22, 24 can act as integral components of a component provided by forming a sheet metal blank, which can be folded over itself and then secured to one another in areas, for example by welding.

Mit dem erfindungsgemäßen Mischer wird es möglich, über den gesamten Querschnitt des Abgasströmungskanals 18 Gas G in den Abgasstrom einzuleiten und effizient mit dem im Abgasströmungskanal 18 strömenden Abgas zu vermischen. Dabei kann das dem Abgas A beizumengende Gas G beispielsweise das von einem Brenner bereitgestellte Abgas sein, welches in einer Startphase des Verbrennungsbetriebs einer Brennkraftmaschine bei einer stromabwärts des Gas/Gas-Mischers positionierten noch kalten Katalysatoranordnung für eine schnellere Erwärmung sorgen kann. Grundsätzlich könnte auch jede andere Art von Gas, beispielsweise Luft, dem Abgasstrom beigemengt werden, um in stromabwärts des Gas/Gas-Mischers 12 folgenden Systembereichen eine verbesserte Betriebscharakteristik zu erhalten.With the mixer according to the invention, it is possible to introduce gas G into the exhaust gas flow over the entire cross section of the exhaust gas flow channel 18 and to mix it efficiently with the exhaust gas flowing in the exhaust gas flow channel 18 . The gas G to be added to the exhaust gas A can be, for example, the exhaust gas provided by a burner, which can ensure faster heating in a starting phase of the combustion operation of an internal combustion engine when the catalyst arrangement is still cold downstream of the gas/gas mixer. In principle, any other type of gas, for example air, could also be added to the exhaust gas flow in order to obtain improved operating characteristics in the system areas downstream of the gas/gas mixer 12 .

Claims (14)

  1. Gas/gas mixer for introducing gas into the exhaust gas stream of an internal combustion engine, comprising an exhaust gas flow duct (18) in an exhaust gas carrying element (14), through which exhaust gas (A) can flow, a mixer body (20) arranged in the exhaust gas carrying element (14) with a plurality of exhaust gas flow openings (44), through which exhaust gas (A) flowing in the exhaust gas flow duct (18) can flow, wherein a gas feed volume (38), through which gas (G) to be introduced into the exhaust gas stream (A) can flow, is formed in the mixer body (20), and wherein the gas feed volume (38) is open towards the exhaust gas flow duct (18) via a plurality of gas release openings (56), wherein the mixer body (20) comprises a first mixer body part (22) that is arranged oriented in the upstream direction in the exhaust gas carrying element (14) and a second mixer body part (24) that is arranged in the downstream direction in the exhaust gas carrying element (14), wherein the gas feed volume (38) is formed essentially between the first mixer body part (22) and the second mixer body part (24), wherein a plurality of flow-through holes (48) are provided for providing the exhaust gas flow openings (44) in the second mixer body part (24), characterized in that a flow-through bulge (50) extending to the second mixer body part (24), carrying exhaust gas (A) in the direction of the associated flow-through hole (48) and providing a flow duct (52) of the first mixer body part (22), is provided in the first mixer body part (22) in association with each flow-through hole (48) of the second mixer body part (24).
  2. Gas/gas mixer in accordance with claim 1, characterized in that the mixer body (20) has a plate-shaped configuration and is arranged in the exhaust gas carrying element (14) obliquely to an exhaust gas main flow direction (H) of the exhaust gas (A) flowing through the exhaust gas flow duct (18).
  3. Gas/gas mixer in accordance with claim 2, characterized in that the first mixer body part (22) has an essentially plate-shaped configuration, and that the second mixer body part (24) has an essentially plate-shaped configuration.
  4. Gas/gas mixer in accordance with one of claims 1-3, characterized in that a fastening area fixed to the exhaust gas carrying element (14) is provided at one of the mixer body parts, preferably at the second mixer body part (24), and that a second fastening area fixed to the one mixer body part is provided at the other mixer body part, preferably at the first mixer body part (22).
  5. Gas/gas mixer in accordance with claim 4, characterized in that the first fastening area comprises a preferably essentially cylindrical fastening edge (28), which is fixed to an inner circumferential surface of the exhaust gas carrying element (14), in an outer circumferential area (26) of the one mixer body part.
  6. Gas/gas mixer in accordance with claim 4 or 5, characterized in that the second fastening area comprises a preferably essentially cylindrical fastening edge (34), which is fixed to the one mixer body part, in an outer circumferential area (32) of the other mixer body part.
  7. Gas/gas mixer in accordance with one of claims 1-6, characterized in that the flow-through bulges (50) provided in the first mixer body part (22) in association with the flow-through holes (48) of the second mixer body part (24) are tubular or funnel-shaped.
  8. Gas/gas mixer in accordance with one of claims 1-7, characterized in that in at least one, preferably in each exhaust gas flow opening (44), a gas release opening (56) is formed between a flow-through hole edge area (46) of the second mixer body part (24), which flow-through hole edge area encloses a flow-through hole (48) in the second mixer body part (24), and the flow-through bulge (50) of the first mixer body part (22).
  9. Gas/gas mixer in accordance with one of claims 1-8, characterized in that at least one gas release opening (56) is provided in the second mixer body part (24) between the flow-through holes (48) provided in the second mixer body part (24), or/and that at least one gas release opening (56) is provided in the first mixer body part (22), preferably in the area of at least one flow-through bulge (50).
  10. Gas/gas mixer in accordance with claim 9, characterized in that in at least one, preferably in each exhaust gas flow opening (44), the flow-through bulge (50) is in contact with a flow-through hole edge area (46) of the second mixer body part (24), which flow-through hole edge area encloses the flow-through hole (48) in the second mixer body part (22) preferably such that the gas feed volume (38) is essentially closed against the discharge of gas (G) in the area of this exhaust gas flow opening (44).
  11. Gas/gas mixer in accordance with one of claims 1-10, characterized in that the first mixer body part (22) is a shaped sheet metal part, or/and that the second mixer body part (24) is a shaped sheet metal part.
  12. Gas/gas mixer in accordance with one of the preceding claims, characterized in that at an outer circumferential area of the mixer body (20), a gas feed duct (42), which is passed through a wall (16) of the exhaust gas carrying element (14), is open towards the gas feed volume (38).
  13. Gas/gas mixer in accordance with one of the preceding claims, characterized in that the mixer body (20) is arranged in the exhaust gas carrying element (12) such that exhaust gas (A) essentially only flows through the exhaust gas flow openings (44) in the exhaust gas flow duct (18) in the area of the mixer body (20).
  14. Exhaust system for an internal combustion engine of a vehicle, comprising a gas/gas mixer (12) in accordance with one of the preceding claims.
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CN113137299B (en) 2023-02-17
US20210222605A1 (en) 2021-07-22
US11384671B2 (en) 2022-07-12
EP3851646A1 (en) 2021-07-21
DE102020101134A1 (en) 2021-07-22
CN113137299A (en) 2021-07-20

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