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WO2007115748A1 - Assembly for mixing a medium with the exhaust-gas flow of a motor-vehicle exhaust-gas system - Google Patents

Assembly for mixing a medium with the exhaust-gas flow of a motor-vehicle exhaust-gas system Download PDF

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Publication number
WO2007115748A1
WO2007115748A1 PCT/EP2007/003004 EP2007003004W WO2007115748A1 WO 2007115748 A1 WO2007115748 A1 WO 2007115748A1 EP 2007003004 W EP2007003004 W EP 2007003004W WO 2007115748 A1 WO2007115748 A1 WO 2007115748A1
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WO
WIPO (PCT)
Prior art keywords
exhaust
connecting element
exhaust pipe
medium
gas flow
Prior art date
Application number
PCT/EP2007/003004
Other languages
German (de)
French (fr)
Inventor
Rolf Kaiser
Klaus Rusch
Original Assignee
Emcon Technologies Germany (Augsburg) Gmbh
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 Emcon Technologies Germany (Augsburg) Gmbh filed Critical Emcon Technologies Germany (Augsburg) Gmbh
Priority to US12/295,949 priority Critical patent/US20090049829A1/en
Publication of WO2007115748A1 publication Critical patent/WO2007115748A1/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
    • F01N3/18—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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • 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
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to an assembly for mixing a medium with the exhaust gas stream of a motor vehicle exhaust system.
  • urea may be injected in dissolved form upstream of an SCR catalyst to provide ammonia as a reductant for the nitrogen oxides present in the exhaust gas.
  • a particulate filter reducing agent such as e.g. Fuel to be supplied in order to burn off the particles retained in the filter controlled.
  • reducing agent such as e.g. Fuel to be supplied in order to burn off the particles retained in the filter controlled.
  • the object of the invention is thus to achieve a uniform distribution of an introduced medium in the exhaust gas flow with little effort and high reliability, in particular in the exhaust gas flow of a twin-flow exhaust system.
  • an assembly of the aforementioned type is provided for this purpose, with a first exhaust pipe, which has a device for introducing the medium and axially opens into a widened compared to the exhaust pipe connecting element, and a second exhaust pipe, which opens laterally into the connecting element, wherein the connecting element is designed such that it can give the exhaust gas flow an angular momentum.
  • the medium becomes Thus, first supplied to the exhaust gas flow in the first exhaust pipe and passes with this in the connecting element, in which there is a mixing with the exhaust gas stream from the second exhaust pipe. In this case, the entire exhaust gas flow in the interior of the connecting element is given a twist, which leads to a good turbulence and thus to a good distribution of the medium.
  • the embodiment according to the invention is particularly suitable for a double-flow exhaust system, wherein only a single device for introducing the medium is necessary, but can be used in any exhaust system, the exhaust stream is at least partially divided into two tubes.
  • the first exhaust pipe extends beyond the mouth region of the second exhaust pipe into the interior of the connecting element.
  • the exhaust gas flow from the second exhaust pipe thus initially strikes the wall of the first exhaust pipe and thereby becomes a circular movement about the
  • the connecting element has the shape of a cone, in whose larger end face the first exhaust pipe opens. Due to the tapered side walls of the connecting element, a particularly 'good turbulence is obtained of the exhaust stream.
  • the second exhaust pipe opens tangentially into the connecting element.
  • the exhaust gas flow from the second exhaust pipe is forced in a simple manner onto a helical path along the inner wall of the connecting element.
  • the connecting element may have on its inside a guide surface for the exhaust gas flow.
  • the device may be arranged downstream of a guide element in the first exhaust pipe.
  • the second exhaust pipe is formed integrally with the connecting element.
  • the device may be a urea injection device. However, it could also be a device for introducing reducing agent, such as e.g. Fuel for the regeneration of about a particulate filter act.
  • reducing agent such as e.g. Fuel for the regeneration of about a particulate filter act.
  • FIG. 1 shows a longitudinal section through an assembly according to the invention.
  • FIG. 2 shows a cross section through the assembly along the line H-II.
  • FIG. 1 shows an assembly 10, which is arranged in an exhaust system of a motor vehicle, not shown, and has a first exhaust pipe 12 and a second exhaust pipe 14, which are respectively flowed through in the direction of the arrows Pi of exhaust gas.
  • the exhaust gas flows from the two exhaust pipes 12, 14 are brought together in a connecting element 16, wherein the second exhaust pipe 14 laterally, in particular tangentially (see Figure 2), opens into the connecting element 16 and is designed in one piece with the connecting element 16 in the example shown.
  • the first exhaust pipe 12 opens axially into the connecting element 16 and has a device 18 for introducing a medium, here a urea injection device, which is arranged downstream of a guide element 20.
  • the connecting element 16 has the shape of a cone and is widened with respect to the first exhaust pipe 12, which extends beyond the mouth region of the second exhaust pipe 14 into the interior of the connecting element 16.
  • a turbulence of the combined exhaust gas stream is achieved which effects particularly thorough mixing with the introduced medium (here dissolved urea).
  • the turbulence is indicated in the figures by the helically extending arrow P 2 .
  • the connecting element 16 may have on its inside a guide surface for the exhaust gas flow, which is formed for example by a baffle or plastically deformed wall portions of the connecting element.

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

Abstract

An assembly for mixing a medium with the exhaust-gas flow of a motor-vehicle exhaust-gas system has a first exhaust-gas pipe (12) which has an apparatus (18) for introducing the medium and opens axially into a connecting element (16) which is widened opposite the exhaust-gas pipe (12), and a second exhaust-gas pipe (14) which opens laterally into the connecting element (16). The connecting element (16) is configured in such a way that it can impart a rotational pulse to the exhaust-gas flow.

Description

Baugruppe zur Vermischung eines Mediums mit dem Abgasstrom einer Assembly for mixing a medium with the exhaust stream of a
Kfz-AbgasanlageAutomotive exhaust system
Die Erfindung betrifft eine Baugruppe zur Vermischung eines Mediums mit dem Abgasstrom einer Kfz-Abgasanlage.The invention relates to an assembly for mixing a medium with the exhaust gas stream of a motor vehicle exhaust system.
Bei modernen Abgassystemen ist es manchmal erforderlich, in den Abgasstrom ein Medium einzubringen, um bestimmte Reaktionen hervorzurufen. Beispielsweise kann stromaufwärts eines SCR-Katalysators Harnstoff in gelöster Form eingespritzt werden, um Ammoniak als Reduktionsmittel für die im Abgas vorhandenen Stickoxide bereitzustellen. Auch kann stromaufwärts eines Partikelfilters Reduktionsmittel wie z.B. Kraftstoff zugeführt werden, um die im Filter zurückgehaltenen Partikel kontrolliert abzubrennen. Allgemein gilt dabei, daß das einzubringende Medium möglichst homogen im Abgasstrom verteilt werden soll, damit eine gleichmäßige Wirkung eintritt.In modern exhaust systems, it is sometimes necessary to introduce a medium into the exhaust stream to cause certain reactions. For example, urea may be injected in dissolved form upstream of an SCR catalyst to provide ammonia as a reductant for the nitrogen oxides present in the exhaust gas. Also, upstream of a particulate filter, reducing agent such as e.g. Fuel to be supplied in order to burn off the particles retained in the filter controlled. The general rule is that the medium to be introduced should be distributed as homogeneously as possible in the exhaust gas stream, so that a uniform effect occurs.
Dies gilt insbesondere auch für zweiflutige Abgasanlagen (z.B. bei einem 6- oder 8-Zylinder Motor), bei denen aus Kostengründen oftmals nur eine einzige Harnstoffeinspritzvorrichtung (für SCR-Anwendungen) vorgesehen ist. Diese wird dann üblicherweise stromabwärts eines Verbindungselements angeordnet, welches die Abgasströme aus den beiden Abgasrohren zusammenführt. Auch hier stellt sich das Problem, eine intensive Vermischung des Abgases mit dem eingebrachten Medium zu erreichen.This also applies in particular to double-flow exhaust systems (for example in the case of a 6- or 8-cylinder engine), for which, for cost reasons, often only a single urea injection device (for SCR applications) is provided. This is then usually arranged downstream of a connecting element which brings together the exhaust gas streams from the two exhaust pipes. Again, there is the problem of achieving an intensive mixing of the exhaust gas with the introduced medium.
Die Aufgabe der Erfindung besteht somit darin, mit geringem Aufwand und hoher Zuverlässigkeit eine gleichmäßige Verteilung eines eingebrachten Mediums im Abgasstrom zu erreichen, insbesondere im Abgasstrom einer zweiflutigen Abgasanlage.The object of the invention is thus to achieve a uniform distribution of an introduced medium in the exhaust gas flow with little effort and high reliability, in particular in the exhaust gas flow of a twin-flow exhaust system.
Erfindungsgemäß ist hierzu eine Baugruppe der eingangs genannten Art vorgesehen, mit einem ersten Abgasrohr, das eine Vorrichtung zur Einbringung des Mediums aufweist und axial in ein gegenüber dem Abgasrohr verbreitertes Verbindungselement mündet, und einem zweiten Abgasrohr, das seitlich in das Verbindungselement mündet, wobei das Verbindungselement derart ausgebildet ist, daß es dem Abgasstrom einen Drehimpuls erteilen kann. Das Medium wird also zunächst dem Abgasstrom im ersten Abgasrohr zugeführt und gelangt mit diesem in das Verbindungselement, in dem es zu einer Vermischung mit dem Abgasstrom aus dem zweiten Abgasrohr kommt. Dabei wird dem gesamten Abgasstrom im Inneren des Verbindungselements ein Drall erteilt, der zu einer guten Verwirbelung und somit zu einer guten Verteilung des Mediums führt. Zudem wird eine Verunreinigung der Rohrwände durch das eingebrachte Medium, etwa durch ein Festsetzen des Mediums an den Rohrwänden, vermieden. Die erfindungsgemäße Ausgestaltung eignet sich insbesondere für eine zweiflutige Abgasanlage, wobei nur eine einzige Vorrichtung zur Ein- bringung des Mediums nötig ist, kann jedoch in jeder Abgasanlage eingesetzt werden, deren Abgasstrom zumindest abschnittsweise auf zwei Rohre aufgeteilt wird.According to the invention an assembly of the aforementioned type is provided for this purpose, with a first exhaust pipe, which has a device for introducing the medium and axially opens into a widened compared to the exhaust pipe connecting element, and a second exhaust pipe, which opens laterally into the connecting element, wherein the connecting element is designed such that it can give the exhaust gas flow an angular momentum. The medium becomes Thus, first supplied to the exhaust gas flow in the first exhaust pipe and passes with this in the connecting element, in which there is a mixing with the exhaust gas stream from the second exhaust pipe. In this case, the entire exhaust gas flow in the interior of the connecting element is given a twist, which leads to a good turbulence and thus to a good distribution of the medium. In addition, contamination of the pipe walls by the introduced medium, such as by setting the medium to the tube walls, avoided. The embodiment according to the invention is particularly suitable for a double-flow exhaust system, wherein only a single device for introducing the medium is necessary, but can be used in any exhaust system, the exhaust stream is at least partially divided into two tubes.
Vorzugsweise erstreckt sich das erste Abgasrohr über den Mündungsbereich des zweiten Abgasrohrs hinaus in das Innere des Verbindungselements. Der Abgasstrom aus dem zweiten Abgasrohr trifft also zunächst auf die Wandung des ersten Abgasrohrs und wird dadurch zu einer kreisenden Bewegung um dasPreferably, the first exhaust pipe extends beyond the mouth region of the second exhaust pipe into the interior of the connecting element. The exhaust gas flow from the second exhaust pipe thus initially strikes the wall of the first exhaust pipe and thereby becomes a circular movement about the
Ende des ersten Abgasrohrs gezwungen.Forced end of the first exhaust pipe.
Insbesondere hat das Verbindungselement die Form eines Konus, in dessen größere Stirnfläche das erste Abgasrohr mündet. Durch die schräg zulaufenden Seitenwände des Verbindungselements wird eine besonders' gute Verwirbelung des Abgasstroms erreicht.In particular, the connecting element has the shape of a cone, in whose larger end face the first exhaust pipe opens. Due to the tapered side walls of the connecting element, a particularly 'good turbulence is obtained of the exhaust stream.
Vorteilhaft mündet das zweite Abgasrohr tangential in das Verbindungselement. Somit wird der Abgasstrom aus dem zweiten Abgasrohr in einfacher Weise auf eine Schraubenbahn längs der Innenwand des Verbindungselements gezwungen.Advantageously, the second exhaust pipe opens tangentially into the connecting element. Thus, the exhaust gas flow from the second exhaust pipe is forced in a simple manner onto a helical path along the inner wall of the connecting element.
Zur Unterstützung der Verwirbelung des Abgasstroms kann das Verbindungselement auf seiner Innenseite eine Führungsfläche für den Abgasstrom aufweisen.To support the turbulence of the exhaust gas flow, the connecting element may have on its inside a guide surface for the exhaust gas flow.
Um die Vermischung des eingebrachten Mediums mit dem Abgasstrom im ersten Abgasrohr zu erleichtern, kann die Vorrichtung stromabwärts eines Leitelements im ersten Abgasrohr angeordnet sein. Gemäß einer besonders bevorzugten Ausführungsform ist das zweite Abgas- rohr einstückig mit dem Verbindungselement ausgeführt.In order to facilitate the mixing of the introduced medium with the exhaust gas flow in the first exhaust pipe, the device may be arranged downstream of a guide element in the first exhaust pipe. According to a particularly preferred embodiment, the second exhaust pipe is formed integrally with the connecting element.
Wie bereits eingangs erwähnt, kann die Vorrichtung eine Harnstoffeinspritzvorrichtung sein. Ebenso könnte es sich jedoch auch um eine Vorrichtung zur Einbringung von Reduktionsmittel wie z.B. Kraftstoff zur Regeneration etwa eines Partikelfilters handeln.As already mentioned, the device may be a urea injection device. However, it could also be a device for introducing reducing agent, such as e.g. Fuel for the regeneration of about a particulate filter act.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung einer bevorzugten Ausführungsform anhand der beigefügten Zeichnungen. In diesen zeigen:Further features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the accompanying drawings. In these show:
- Figur 1 einen Längsschnitt durch eine erfindungsgemäße Baugruppe; und- Figure 1 shows a longitudinal section through an assembly according to the invention; and
- Figur 2 einen Querschnitt durch die Baugruppe längs der Linie H-Il.- Figure 2 shows a cross section through the assembly along the line H-II.
Figur 1 zeigt eine Baugruppe 10, die in einer Abgasanlage eines nicht gezeigten Kraftfahrzeugs angeordnet ist und ein erstes Abgasrohr 12 sowie ein zweites Abgasrohr 14 aufweist, die jeweils in Richtung der Pfeile Pi von Abgas durch- strömt werden. Die Abgasströme aus beiden Abgasrohren 12, 14 werden in einem Verbindungselement 16 zusammengeführt, wobei das zweite Abgasrohr 14 seitlich, insbesondere tangential (siehe Figur 2), in das Verbindungselement 16 mündet und im gezeigten Beispiel einstückig mit dem Verbindungselement 16 ausgeführt ist.1 shows an assembly 10, which is arranged in an exhaust system of a motor vehicle, not shown, and has a first exhaust pipe 12 and a second exhaust pipe 14, which are respectively flowed through in the direction of the arrows Pi of exhaust gas. The exhaust gas flows from the two exhaust pipes 12, 14 are brought together in a connecting element 16, wherein the second exhaust pipe 14 laterally, in particular tangentially (see Figure 2), opens into the connecting element 16 and is designed in one piece with the connecting element 16 in the example shown.
Das erste Abgasrohr 12 mündet axial in das Verbindungselement 16 und weist eine Vorrichtung 18 zur Einbringung eines Mediums, hier eine Harnstoffeinspritzvorrichtung, auf, die stromabwärts eines Leitelements 20 angeordnet ist. Das Verbindungselement 16 hat die Form eines Konus und ist gegenüber dem ersten Abgasrohr 12 verbreitert, das sich über den Mündungsbereich des zweiten Abgasrohrs 14 hinaus in das Innere des Verbindungselements 16 erstreckt.The first exhaust pipe 12 opens axially into the connecting element 16 and has a device 18 for introducing a medium, here a urea injection device, which is arranged downstream of a guide element 20. The connecting element 16 has the shape of a cone and is widened with respect to the first exhaust pipe 12, which extends beyond the mouth region of the second exhaust pipe 14 into the interior of the connecting element 16.
Durch die tangentiale Einbringung des Abgasstroms aus dem zweiten Abgasrohr 14 in das konusförmige Verbindungselement 16 wird eine auch als Vortex bezeichnete Verwirbelung des vereinigten Abgasstroms erreicht, die eine besonders gute Durchmischung mit dem eingebrachten Medium (hier gelöster Harnstoff) bewirkt. Die Verwirbelung ist in den Figuren durch den schraubenförmig verlaufenden Pfeil P2 angedeutet. Abweichend von der dargestellten Ausführungsform kann das Verbindungselement 16 auf seiner Innenseite eine Führungsfläche für den Abgasstrom aufweisen, die z.B. durch ein Leitblech oder plastisch verformte Wandabschnitte des Verbindungselements gebildet ist. Due to the tangential introduction of the exhaust gas flow from the second exhaust pipe 14 into the cone-shaped connecting element 16, a turbulence of the combined exhaust gas stream, also referred to as vortex, is achieved which effects particularly thorough mixing with the introduced medium (here dissolved urea). The turbulence is indicated in the figures by the helically extending arrow P 2 . Notwithstanding the illustrated embodiment, the connecting element 16 may have on its inside a guide surface for the exhaust gas flow, which is formed for example by a baffle or plastically deformed wall portions of the connecting element.

Claims

Patentansprüche claims
1. Baugruppe zur Vermischung eines Mediums mit dem Abgasstrom einer Kfz-Abgasanlage, mit einem ersten Abgasrohr (12), das eine Vorrichtung (18) zur Einbringung des1. assembly for mixing a medium with the exhaust gas stream of a vehicle exhaust system, with a first exhaust pipe (12) having a device (18) for introducing the
Mediums aufweist und axial in ein gegenüber dem Abgasrohr (12) verbreitertes Verbindungselement (16) mündet, und einem zweiten Abgasrohr (14), das seitlich in das Verbindungselement (16) mündet, wobei das Verbindungselement (16) derart ausgebildet ist, daß es demMedium and axially into a relative to the exhaust pipe (12) widened connecting element (16) opens, and a second exhaust pipe (14) laterally into the connecting element (16) opens, wherein the connecting element (16) is formed such that it
Abgasstrom einen Drehimpuls erteilen kann.Exhaust gas flow can impart an angular momentum.
2. Baugruppe nach Anspruch 1 , dadurch gekennzeichnet, daß sich das erste Abgasrohr (12) über den Mündungsbereich des zweiten Abgasrohrs (14) hinaus in das Innere des Verbindungselements (16) erstreckt.2. Assembly according to claim 1, characterized in that extending the first exhaust pipe (12) beyond the mouth region of the second exhaust pipe (14) also into the interior of the connecting element (16).
3. Baugruppe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das3. Assembly according to claim 1 or 2, characterized in that the
Verbindungselement (16) die Form eines Konus hat.Connecting element (16) has the shape of a cone.
4. Baugruppe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das zweite Abgasrohr (14) tangential in das Verbindungselement (16) mündet.4. Assembly according to one of the preceding claims, characterized in that the second exhaust pipe (14) opens tangentially into the connecting element (16).
5. Baugruppe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Verbindungselement (16) auf seiner Innenseite eine Führungsfläche für den Abgasstrom aufweist.5. Assembly according to one of the preceding claims, characterized in that the connecting element (16) has on its inside a guide surface for the exhaust gas flow.
6. Baugruppe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Vorrichtung (18) stromabwärts eines Leitelements (20) im ersten Abgasrohr (12) angeordnet ist.6. Assembly according to one of the preceding claims, characterized in that the device (18) downstream of a guide element (20) in the first exhaust pipe (12) is arranged.
7. Baugruppe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das zweite Abgasrohr (14) einstückig mit dem Verbindungselement (16) ausgeführt ist. 7. An assembly according to any one of the preceding claims, characterized in that the second exhaust pipe (14) is integral with the connecting element (16).
8. Baugruppe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Vorrichtung (18) eine Harnstoffeinspritzvorrichtung ist. 8. Assembly according to one of the preceding claims, characterized in that the device (18) is a urea injection device.
PCT/EP2007/003004 2006-04-05 2007-04-03 Assembly for mixing a medium with the exhaust-gas flow of a motor-vehicle exhaust-gas system WO2007115748A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/295,949 US20090049829A1 (en) 2006-04-05 2007-04-03 Assembly for Mixing a Medium with the Exhaust Gas Flow of a Motor Vehicle Exhaust System

Applications Claiming Priority (2)

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