WO2016177361A1 - Mixing device - Google Patents

Mixing device Download PDF

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Publication number
WO2016177361A1
WO2016177361A1 PCT/DE2016/100194 DE2016100194W WO2016177361A1 WO 2016177361 A1 WO2016177361 A1 WO 2016177361A1 DE 2016100194 W DE2016100194 W DE 2016100194W WO 2016177361 A1 WO2016177361 A1 WO 2016177361A1
Authority
WO
WIPO (PCT)
Prior art keywords
mixing device
flow
exhaust gas
axial end
housing
Prior art date
Application number
PCT/DE2016/100194
Other languages
German (de)
French (fr)
Inventor
Miroslaw Krzywik
David Maizak
Jan Von Hollen
Carolus Grünig
Ajay Sunder Radhakrishnan
Original Assignee
Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr
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 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr filed Critical Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr
Publication of WO2016177361A1 publication Critical patent/WO2016177361A1/en

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Classifications

    • 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
    • B01F25/43161—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 composed of consecutive sections of flat pieces of material
    • 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
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
    • 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
    • B01F25/421—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 by moving the components in a convoluted or labyrinthine path
    • B01F25/423—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 by moving the components in a convoluted or labyrinthine path by means of elements placed in the receptacle for moving or guiding the components
    • B01F25/4233—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 by moving the components in a convoluted or labyrinthine path by means of elements placed in the receptacle for moving or guiding the components using plates with holes, the holes being displaced from one plate to the next one to force the flow to make a bending movement
    • 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
    • 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
    • B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
    • B01F25/431971—Mounted on the wall
    • 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
    • B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
    • B01F25/431973—Mounted on a support member extending transversally through the mixing tube
    • 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
    • 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
    • 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 a mixing device according to the preamble of claim 1.
  • mixing devices are used for mixing of liquid reducing agent, for example, a urea-water solution in the exhaust gas mass flow of internal combustion engines with SCR exhaust aftertreatment systems (SCR Engl.
  • the generation of a characteristic flow field influences the transport and behavior of the liquid and gaseous reducing agent in the flow.
  • the exhaust treatment system includes a canister having an upstream inlet, a partition wall disposed in the canister at a distance downstream of the upstream inlet to thereby define an exhaust gas concentration chamber, an exhaust port disposed in the partition wall, and exhaust gas passing through enters the exhaust gas consolidation chamber, enters a high pressure and high velocity mixing line.
  • the mixing conduit includes a substantially U-shaped conduit configured to direct the fluid / exhaust mixture from a downstream to an upstream direction in the compact mixing space for mixing, and an outlet of the mixing conduit for high pressure and high velocity which is disposed adjacent to a downstream side of the partition wall, and a
  • Low pressure and low velocity exit volume thereby defining the rigid canister downstream of the dividing wall and configured to receive the fluid / exhaust mixture from the high pressure, high velocity mixing line outlet for further mixing of the fluid / exhaust mixture the actual exhaust gas flow distance is realized over a line-of-sight flow distance.
  • the invention has for its object to provide a mixing device, which ensures a high mixing quality with low exhaust back pressure and a compact design.
  • the main flow direction of the exhaust gas mass flow is maintained when flowing in and out.
  • the flow direction is deflected such that the exhaust gas mass flow temporarily flows opposite to the main flow direction.
  • the change of the main flow direction in the mixer is caused by a longitudinal overlap of the inlet and outlet tubes, i. H. in their respective longitudinal extent, one end of the inlet tube and one end of the outlet tube overlap in a range achieved.
  • the area of the overlap has a value greater than "0." This lengthens the mixing section relative to the distance of the main flow direction, achieves a good distribution of the reducing agent with a low exhaust backpressure and the light-off of the downstream.
  • an additional mixing element can be omitted, so that the exhaust back pressure is reduced.
  • the mixing device has an injector.
  • the injector is arranged such that the supplied reducing agent is supplied to the exhaust gas mass flow flowing into the mixing device from the end of the inlet pipe.
  • the term "reducing agent" refers first to the already prepared urea-water solution, ie ammonia, thus injecting a urea-water solution by means of the injector.
  • reducing agent can flow into the mixing device at a defined angle. The angle can depend on the geometric formations of the
  • Mixing device in particular of the outlet pipe, be chosen to the good
  • a flow divider element is arranged in the housing of the mixing device downstream of the inlet tube.
  • the flow dividing element can be arranged such that the exhaust gas mass flow and the reducing agent are divided equally into two equal mass flows.
  • At least one guide element is arranged on the inner circumference of the housing.
  • At least one guide element is arranged on the outer circumference of the outlet tube.
  • the outlet pipe projecting into the housing has a widening from a first cross section through to a second cross section in the main flow direction of the exhaust gas mass flow.
  • the expansion may be, for example, linear, progressive, degressive, continuous or unsteady.
  • the inlet tube is at a distance from the inner circumference of the housing.
  • the distance has the value "0", so that the inlet tube is adjacent to the housing.
  • the inlet tube is located in the region of the overlap by a distance from the end of the outlet tube.
  • the first axial end section has at least one small opening.
  • the small opening is arranged in the first axial end section in such a way that it is opaque.
  • the outlet pipe has at least one small opening. By means of the small opening, the mixing can be improved.
  • Fig. 1 a schematic representation of a first embodiment of a
  • Fig. 2 is a perspective view of a second embodiment partially in section; 3 shows a perspective view of a third embodiment.
  • Fig. 1 shows a part of an exhaust line 1 of an internal combustion engine, not shown.
  • An exhaust gas mass flow may flow out of a first exhaust aftertreatment device 2, for example a diesel oxidation catalyst, in a main flow direction (arrow P1).
  • a first exhaust aftertreatment device 2 for example a diesel oxidation catalyst
  • a mixing device 3 Downstream of the first exhaust gas aftertreatment device 2, a mixing device 3 is arranged in the exhaust gas line 1.
  • the mixing device 3 has a cylindrical housing 4 with a first axial
  • the first axial end portion 5 is inclined relative to the axis of the housing 4.
  • the angle of inclination may advantageously be in the range between 45 ° and 90 °. This offers the advantage of a pressure loss reduction by the flow guidance in the inlet area.
  • one end 8 of a cylindrical inlet pipe 9 projects into the mixing device 3.
  • the eccentricity refers to the axis of the housing. 4
  • the exhaust gas mass flow can in the main flow direction (arrow P1) through the
  • Inlet pipe 9 to flow into the housing 4 of the mixing device 3.
  • An end 11 of a partially funnel-shaped outlet tube 12 projects into the mixing device 3 by means of an opening 10 in the second axial end section 6.
  • the exhaust gas mass flow can flow out of the mixing device 3 out of the outlet pipe 12 in the main flow direction (arrow P1).
  • Exhaust after-treatment device 13 for example, a SCR or SDPF unit arranged.
  • the inlet pipe 9 is removed from the inner wall of the housing 4 by a radial distance 15 and from the end 11 of the outlet pipe 12 by a radial distance 16.
  • an injector 17 Downstream of the inlet pipe 9, an injector 17 is arranged on the housing 4, by means of which reducing agent (for example a urea-water solution) of the exhaust gas mass flow flowing out of the end 8 of the inlet pipe 9 can be supplied.
  • the injector 17 is inclined at an angle ⁇ relative to the housing 4.
  • the injector 17 may be arranged such that the outflowing reducing agent impinges on the outer surface of the projecting into the housing 4 outlet pipe 12 and is very well distributed.
  • a flow dividing element 18 is arranged in the housing 4 of the mixing device 3 such that both the exhaust gas mass flow flowing out of the inlet pipe 9 and the reducing agent are divided into two partial flows in the direction of the arrows P2 and P3 (shown in FIG. 3).
  • Partial flow element 18 partially into the end 8 of the inlet tube 9 inside.
  • the defined flow distribution can be improved.
  • the exhaust gas mass flow offset with reducing agent is deflected in such a way that it flows counter to the main flow direction (arrow P4).
  • a further deflection in the direction of the main flow direction (arrow P4) takes place at the first axial end section 5.
  • the outlet pipe 12 projecting into the housing 4 of the mixing device 3 has different cross sections. At the end 11, the outlet pipe 12 has a
  • the outlet pipe 12 has a cross-section Q2, which is larger in comparison to the cross-section Q1.
  • the first axial end portion 5 has in comparison to the opening 7 small openings 20 through which the exhaust gas mass flow can flow into the mixing device 3.
  • the small openings are arranged in a region 21 below the end 11 of the outlet tube 12, so that a opacity against the inlet of the outlet tube 12 is given.
  • the outlet pipe 12 has small openings 22 through which the exhaust gas mass flow can flow out of the mixing device 3. As a result, the mixing can be improved.
  • FIG. 3 shows a third embodiment of the mixing device 3.
  • the inlet pipe 9 is located both on the housing 4 (ie, the distance 15 is "0") and on the outlet pipe 12 (ie, the distance 16 is the value "0" on).
  • the mixing device 3 can be produced for example by deep drawing.
  • the axes of the inlet pipe 9 and the outlet pipe 12 are parallel to the axis of the housing 4.
  • the axis of the inlet pipe 9 and / or the axis of the outlet pipe 12 with respect to the axis of the housing 4 to tilt.

Landscapes

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

Abstract

The invention relates to a mixing device (3) comprising a housing (4) having a first axial end section (5) and a second axial end section (6) which is opposite the first axial end section (5). The first axial end section (5) has an eccentric opening (7), through which an end (8) of an inlet pipe (9) projects into the mixing device (3), wherein an exhaust gas mass stream can flow into the mixing device (3) through the eccentric opening (7). The second axial and section (6) has an opening (10) from which the exhaust gas mass stream can flow out of the mixing device (3). According to the invention, an end (11) of an outlet pipe (12) projects into the mixing device (3) through the opening (10) of the second axial end section (6), wherein the end (8) of the inlet pipe (9) and the end (11) of the outlet pipe (12) overlap longitudinally in one area (14). The exhaust gas mass stream can flow into the mixing device (3) and out of the mixing device (3) in a main flow direction (P1).

Description

Mischeinrichtung Technisches Gebiet  Mixing device Technical field
Die Erfindung betrifft eine Mischeinrichtung gemäß dem Oberbegriff des Anspruchs 1.  The invention relates to a mixing device according to the preamble of claim 1.
In Abgasanlagen angeordnete Mischeinrichtungen dienen zur Vermischung von flüssigem Reduktionsmittel, beispielsweise eine Harnstoff-Wasser-Lösung, im Abgasmassenstrom von Verbrennungskraftmaschinen mit SCR-Abgasnachbehandlungssystemen (SCR engl. In mixing systems arranged mixing devices are used for mixing of liquid reducing agent, for example, a urea-water solution in the exhaust gas mass flow of internal combustion engines with SCR exhaust aftertreatment systems (SCR Engl.
Abkürzung für selective catalytic reduction). Diese haben die Aufgabe, das über einen Injektor zugeführte flüssige Reduktionsmittel möglichst homogen in dem Abgasmassenstrom zu verteilen. Abbreviation for selective catalytic reduction). These have the task of distributing the supplied via an injector liquid reducing agent as homogeneously as possible in the exhaust gas mass flow.
Durch die Erzeugung eines charakteristischen Strömungsfeldes werden der Transport und das Verhalten des flüssigen und gasförmigen Reduktionsmittels in der Strömung beeinflusst.  The generation of a characteristic flow field influences the transport and behavior of the liquid and gaseous reducing agent in the flow.
Stand der Technik State of the art
Aus der DE 10 2013 205 297 A1 ist ein Abgasbehandlungssystem mit einem kompakten Mischraum, der derart konfiguriert ist, ein Abgas/Fluid-Gemisch aufzunehmen, bekannt. Das Abgasbehandlungssystem umfasst einen Kanister mit einem stromaufwärtigen Einlass, eine Trennwand, die in dem Kanister unter einer Distanz stromabwärts des stromaufwärtigen Einlasses angeordnet ist, um dadurch eine Abgaskonsolidierungskammer zu definieren, eine Abgasöffnung, die in der Trennwand angeordnet ist und durch die Abgas, das durch die Abgaskonsolidierungskammer gelangt, in eine Mischleitung für hohen Druck und hohe Geschwindigkeit eintritt. Die Mischleitung umfasst eine im Wesentlichen u-förmige Leitung, die derart konfiguriert ist, das Fluid/Abgas-Gemisch von einer stromabwärtigen zu einer stromaufwärtigen Richtung in dem kompakten Mischraum für eine Durchmischung zu lenken, und einen Austritt der Mischleitung für hohen Druck und hohe Geschwindigkeit, der benachbart einer stromabwärtigen Seite der Trennwand angeordnet ist, und ein  From DE 10 2013 205 297 A1 an exhaust treatment system with a compact mixing space configured to receive an exhaust gas / fluid mixture is known. The exhaust treatment system includes a canister having an upstream inlet, a partition wall disposed in the canister at a distance downstream of the upstream inlet to thereby define an exhaust gas concentration chamber, an exhaust port disposed in the partition wall, and exhaust gas passing through enters the exhaust gas consolidation chamber, enters a high pressure and high velocity mixing line. The mixing conduit includes a substantially U-shaped conduit configured to direct the fluid / exhaust mixture from a downstream to an upstream direction in the compact mixing space for mixing, and an outlet of the mixing conduit for high pressure and high velocity which is disposed adjacent to a downstream side of the partition wall, and a
Austrittsvolumen für geringen Druck und geringe Geschwindigkeit, dadurch den starren Kanister stromabwärts der Trennwand definiert und derart konfiguriert ist, das Fluid/Abgas- Gemisch von dem Austritt der Mischleitung für hohen Druck und hohe Geschwindigkeit zur weiteren Mischung des Fluid/Abgas-Gemisches aufzunehmen, wobei die tatsächliche Abgasströmungsdistanz über eine Sichtlinienströmungsdistanz verwirklicht wird. Low pressure and low velocity exit volume, thereby defining the rigid canister downstream of the dividing wall and configured to receive the fluid / exhaust mixture from the high pressure, high velocity mixing line outlet for further mixing of the fluid / exhaust mixture the actual exhaust gas flow distance is realized over a line-of-sight flow distance.
Mischeinrichtungen, die zur Verdunstung und Vermischung von flüssigem Reduktionsmittel eingesetzt werden, verursachen teilweise einen hohen Abgasgegendruck bei einer schlechten Mischqualität, die vom Betriebspunkt abhängig ist. Der Zielkonflikt zwischen hoher Mischqualität und geringem Abgasgegendruck ist oftmals nicht im gesamten Some of the mixing equipment used to evaporate and mix liquid reductant cause high exhaust backpressure with poor mixing quality depending on the operating point. The conflict of goals between high mixing quality and low exhaust gas back pressure is often not in the whole
Motorkennfeld gelöst. Engine map solved.
Aufgabe der Erfindung Object of the invention
Der Erfindung liegt die Aufgabe zugrunde, eine Mischeinrichtung bereitzustellen, welche eine hohe Mischqualität bei gleichzeitig geringem Abgasgegendruck sowie eine kompakte Bauform gewährleistet.  The invention has for its object to provide a mixing device, which ensures a high mixing quality with low exhaust back pressure and a compact design.
Lösung der Aufgabe Solution of the task
Die Erfindung wird durch eine Mischeinrichtung gemäß Anspruch 1 gelöst. Vorteile der Erfindung  The invention is solved by a mixing device according to claim 1. Advantages of the invention
Mittels der erfindungsgemäßen Mischeinrichtung wird die Hauptströmungsrichtung des Abgasmassenstroms beim Hinein- und Herausströmen beibehalten.  By means of the mixing device according to the invention, the main flow direction of the exhaust gas mass flow is maintained when flowing in and out.
Weiterhin wird in der Mischeinrichtung die Strömungsrichtung derart umgelenkt, dass der Abgasmassenstrom zeitweilig entgegensetzt zu der Hauptströmungsrichtung strömt. Furthermore, in the mixing device, the flow direction is deflected such that the exhaust gas mass flow temporarily flows opposite to the main flow direction.
Die Änderung der Hauptströmungsrichtung in der Mischeinrichtung wird durch eine longitudinale Überlappung des Einlass- und des Auslassrohres, d. h. in ihrer jeweiligen Längserstreckung überlappen ein Ende des Einlassrohres und ein Ende des Auslassrohres in einem Bereich, erzielt. Der Bereich der Überlappung weist einen Wert größer„0" auf. Hierdurch wird bezogen auf die Distanz der Hauptströmungsrichtung die Mischstrecke verlängert, eine gute Verteilung des Reduktionsmittels bei einem geringen Abgasgegendruck erzielt, sowie das zeitlich schnelle Anspringverhalten (engl, light-off) der stromabwärts angeordneten Abgasnachbehandlungseinrichtung verbessert. Zusätzlich weist die The change of the main flow direction in the mixer is caused by a longitudinal overlap of the inlet and outlet tubes, i. H. in their respective longitudinal extent, one end of the inlet tube and one end of the outlet tube overlap in a range achieved. The area of the overlap has a value greater than "0." This lengthens the mixing section relative to the distance of the main flow direction, achieves a good distribution of the reducing agent with a low exhaust backpressure and the light-off of the downstream In addition, the
Mischeinrichtung einen kompakten Aufbau auf. In der erfindungsgemäßen Mischeinrichtung kann ein zusätzliches Mischelement entfallen, so dass der Abgasgegendruck reduziert wird. Mixer on a compact construction. In the mixing device according to the invention, an additional mixing element can be omitted, so that the exhaust back pressure is reduced.
In einer vorteilhaften Ausführungsform weist die Mischeinrichtung einen Injektor auf. Der Injektor ist derart angeordnet, dass das zugeführte Reduktionsmittel dem aus dem Ende des Einlassrohres in die Mischeinrichtung hineinströmenden Abgasmassenstrom zugeführt wird. Mit dem Begriff„Reduktionsmittel" wird im engeren Sinne erst die bereits aufbereitete Harnstoff-Wasser-Lösung, d. h. Ammoniak, bezeichnet. Mittels des Injektors wird somit eine Harnstoff-Wasser-Lösung eingedüst. In an advantageous embodiment, the mixing device has an injector. The injector is arranged such that the supplied reducing agent is supplied to the exhaust gas mass flow flowing into the mixing device from the end of the inlet pipe. In the narrower sense, the term "reducing agent" refers first to the already prepared urea-water solution, ie ammonia, thus injecting a urea-water solution by means of the injector.
Weiterhin gibt es Anwendungen, bei denen Ammoniak direkt gasförmig dem  Furthermore, there are applications in which ammonia directly to the gas
Abgasmassenstrom zugeführt wird. Diese Variante wird im Sinne der Erfindung dem Begriff „Reduktionsmittel" subsumiert. Weiterhin kann das Reduktionsmittel in einem definierten Winkel in die Mischeinrichtung einströmen. Der Winkel kann abhängig von den geometrischen Ausbildungen der Exhaust gas mass flow is supplied. This variant is subsumed within the meaning of the invention the term "reducing agent". Furthermore, the reducing agent can flow into the mixing device at a defined angle. The angle can depend on the geometric formations of the
Mischeinrichtung, insbesondere des Auslassrohres, gewählt werden, um die gute Mixing device, in particular of the outlet pipe, be chosen to the good
Vermischung zu erzielen. To achieve mixing.
In einer weiteren vorteilhaften Ausführungsform ist in dem Gehäuse der Mischeinrichtung stromabwärts von dem Einlassrohr ein Strömungsaufteilungselement angeordnet. Das Strömungsaufteilungselement kann derart angeordnet sein, dass der Abgasmassenstrom und das Reduktionsmittel gleichmäßig in zwei gleichgroße Massenströme aufgeteilt werden. In a further advantageous embodiment, a flow divider element is arranged in the housing of the mixing device downstream of the inlet tube. The flow dividing element can be arranged such that the exhaust gas mass flow and the reducing agent are divided equally into two equal mass flows.
In einer weiteren vorteilhaften Ausführungsform ist an dem Innenumfang des Gehäuses mindestens ein Leitelement angeordnet. Mittels des Leitelements können die Strömung und die Vermischung beeinflusst werden. In a further advantageous embodiment, at least one guide element is arranged on the inner circumference of the housing. By means of the guide element, the flow and the mixing can be influenced.
In einer weiteren vorteilhaften Ausführungsform ist an dem Außenumfang des Auslassrohres mindestens ein Leitelement angeordnet. Mittels des Leitelements können die Strömung und die Vermischung beeinflusst werden. In a further advantageous embodiment, at least one guide element is arranged on the outer circumference of the outlet tube. By means of the guide element, the flow and the mixing can be influenced.
In einer weiteren vorteilhaften Ausführungsform weist das in das Gehäuse hineinragende Auslassrohr in der Hauptströmungsrichtung des Abgasmassenstromes eine Aufweitung von einem ersten Querschnitt hin zu einem zweiten Querschnitt auf. Die Aufweitung kann beispielsweise linear, progressiv, degressiv, stetig oder unstetig sein. Mittels der Aufweitung wird einerseits die Strömungsgeschwindigkeit des durch das Auslassrohr herausströmenden Abgasmassenstromes und der Abgasgegendruck reduziert, und andererseits das auf die Außenseite der Aufweitung treffende Reduktionsmittel in kleinere Bestandteile aufgeteilt und in unterschiedliche Richtungen verteilt. In a further advantageous embodiment, the outlet pipe projecting into the housing has a widening from a first cross section through to a second cross section in the main flow direction of the exhaust gas mass flow. The expansion may be, for example, linear, progressive, degressive, continuous or unsteady. By means of the expansion, on the one hand, the flow velocity of the exhaust gas mass flow flowing out through the outlet pipe and the exhaust backpressure are reduced, and on the other hand, the reducing agent striking the outside of the expansion is divided into smaller components and distributed in different directions.
In einer weiteren vorteilhaften Ausführungsform ist das Einlassrohr um einen Abstand von dem Innenumfang des Gehäuses entfernt. In a further advantageous embodiment, the inlet tube is at a distance from the inner circumference of the housing.
Weiterhin besteht die Möglichkeit, dass der Abstand den Wert„0" aufweist, so dass das Einlassrohr an das Gehäuse angrenzt.  Furthermore, there is the possibility that the distance has the value "0", so that the inlet tube is adjacent to the housing.
In einer weiteren vorteilhaften Ausführungsform ist das Einlassrohr in dem Bereich der Überlappung um einen Abstand von dem Ende des Auslassrohres entfernt. In a further advantageous embodiment, the inlet tube is located in the region of the overlap by a distance from the end of the outlet tube.
Weiterhin besteht die Möglichkeit, dass in dem Bereich der Überlappung der Abstand den Wert„0" aufweist, so dass das Einlassrohr an das Auslassrohr angrenzt bzw. anliegt. In einer weiteren vorteilhaften Ausführungsform weist der erste axiale Endabschnitt mindestens eine kleine Öffnung auf. Die kleine Öffnung ist derart in dem ersten axialen Endabschnitt angeordnet, dass eine Blickdichtigkeit vorliegt. Mittels der kleinen Öffnung kann die Durchmischung verbessert werden. Furthermore, there is the possibility that in the region of the overlap the distance has the value "0", so that the inlet tube adjoins the outlet tube. In a further advantageous embodiment, the first axial end section has at least one small opening. The small opening is arranged in the first axial end section in such a way that it is opaque. By means of the small opening, the mixing can be improved.
In einer weiteren vorteilhaften Ausführungsform weist das Auslassrohr mindestens eine kleine Öffnung auf. Mittels der kleinen Öffnung kann die Durchmischung verbessert werden. In a further advantageous embodiment, the outlet pipe has at least one small opening. By means of the small opening, the mixing can be improved.
Zeichnungen drawings
Es zeigen:  Show it:
Fig. 1 : eine schematische Darstellung einer ersten Ausführungsform einer Fig. 1: a schematic representation of a first embodiment of a
erfindungsgemäßen Mischeinrichtung im Schnitt;  inventive mixing device in section;
Fig. 2: eine perspektivische Ansicht auf eine zweite Ausführungsform teilweise im Schnitt; Fig. 3: eine perspektivische Ansicht auf eine dritte Ausführungsform. Fig. 2 is a perspective view of a second embodiment partially in section; 3 shows a perspective view of a third embodiment.
Fig. 1 zeigt ein Teil eines Abgasstrangs 1 eines nicht dargestellten Verbrennungsmotors. Ein Abgasmassenstrom kann in einer Hauptströmungsrichtung (Pfeil P1) aus einer ersten Abgasnachbehandlungseinrichtung 2, beispielsweise ein Dieseloxidationskatalysator, herausströmen. Fig. 1 shows a part of an exhaust line 1 of an internal combustion engine, not shown. An exhaust gas mass flow may flow out of a first exhaust aftertreatment device 2, for example a diesel oxidation catalyst, in a main flow direction (arrow P1).
Stromabwärts von der ersten Abgasnachbehandlungseinrichtung 2 ist eine Mischeinrichtung 3 in dem Abgasstrang 1 angeordnet.  Downstream of the first exhaust gas aftertreatment device 2, a mixing device 3 is arranged in the exhaust gas line 1.
Die Mischeinrichtung 3 weist ein zylindrisches Gehäuse 4 mit einem ersten axialen  The mixing device 3 has a cylindrical housing 4 with a first axial
Endabschnitt 5 und einem dem ersten axialen Endabschnitt 5 gegenüberliegenden zweiten axialen Endabschnitt 6 auf. End portion 5 and a first axial end portion 5 opposite the second axial end portion 6.
Der erste axiale Endabschnitt 5 ist gegenüber der Achse des Gehäuses 4 geneigt. Der Neigungswinkel kann vorteilhafterweise im Bereich zwischen 45° und 90° liegen. Dies bietet den Vorteil einer Druckverlustreduzierung durch die Strömungsführung im Einlassbereich.  The first axial end portion 5 is inclined relative to the axis of the housing 4. The angle of inclination may advantageously be in the range between 45 ° and 90 °. This offers the advantage of a pressure loss reduction by the flow guidance in the inlet area.
Mittels einer exzentrischen Öffnung 7 in dem ersten axialen Endabschnitt 5 ragt ein Ende 8 eines zylindrischen Einlassrohres 9 in die Mischeinrichtung 3 hinein. Die Exzentrizität bezieht sich auf die Achse des Gehäuses 4. By means of an eccentric opening 7 in the first axial end section 5, one end 8 of a cylindrical inlet pipe 9 projects into the mixing device 3. The eccentricity refers to the axis of the housing. 4
Der Abgasmassenstrom kann in der Hauptströmungsrichtung (Pfeil P1) durch das  The exhaust gas mass flow can in the main flow direction (arrow P1) through the
Einlassrohr 9 in das Gehäuse 4 der Mischeinrichtung 3 hineinströmen. Inlet pipe 9 to flow into the housing 4 of the mixing device 3.
Mittels einer Öffnung 10 in dem zweiten axialen Endabschnitt 6 ragt ein Ende 11 eines teilweise trichterförmigen Auslassrohres 12 in die Mischeinrichtung 3 hinein. Der Abgasmassenstrom kann in der Hauptströmungsrichtung (Pfeil P1) aus dem Auslassrohr 12 aus der Mischeinrichtung 3 herausströmen. An end 11 of a partially funnel-shaped outlet tube 12 projects into the mixing device 3 by means of an opening 10 in the second axial end section 6. The exhaust gas mass flow can flow out of the mixing device 3 out of the outlet pipe 12 in the main flow direction (arrow P1).
Stromabwärts von der Mischeinrichtung 3 ist in dem Abgasstrang 1 eine zweite  Downstream of the mixing device 3 is in the exhaust line 1, a second
Abgasnachbehandlungseinrichtung 13, beispielsweise eine SCR- oder SDPF-Einheit, angeordnet. Exhaust after-treatment device 13, for example, a SCR or SDPF unit arranged.
In einem Bereich 14 überlappen longitudinal das Ende 8 des Einlassrohres 9 und das Ende 1 1 des Auslassrohres 12. In a region 14 longitudinally overlap the end 8 of the inlet tube 9 and the end 1 1 of the outlet tube 12th
Um in der Hauptströmungsrichtung (Pfeil P1) sowohl in die Mischeinrichtung 3  In order in the main flow direction (arrow P1) both in the mixing device 3rd
hineinzuströmen als auch aus der Mischeinrichtung 3 herauszuströmen, erfolgt in der Mischeinrichtung 3 eine Umlenkung des Abgasmassenstromes um insgesamt 360°. to flow in as well as to flow out of the mixing device 3, takes place in the mixing device 3, a deflection of the exhaust gas mass flow by a total of 360 °.
Hierdurch wird eine lange Mischstrecke in einer kompakten Anordnung erzielt. As a result, a long mixing distance is achieved in a compact arrangement.
Das Einlassrohr 9 ist von der Innenwand des Gehäuses 4 um einen radialen Abstand 15 und von dem Ende 11 des Auslassrohres 12 um einen radialen Abstand 16 entfernt. The inlet pipe 9 is removed from the inner wall of the housing 4 by a radial distance 15 and from the end 11 of the outlet pipe 12 by a radial distance 16.
Stromabwärts des Einlassrohres 9 ist an dem Gehäuse 4 ein Injektor 17 angeordnet, mittels welchem Reduktionsmittel (beispielsweise eine Harnstoff-Wasser-Lösung) des aus dem Ende 8 des Einlassrohres 9 herausströmenden Abgasmassenstromes zugeführt werden kann. Der Injektor 17 ist um einen Winkel α gegenüber dem Gehäuse 4 geneigt. Downstream of the inlet pipe 9, an injector 17 is arranged on the housing 4, by means of which reducing agent (for example a urea-water solution) of the exhaust gas mass flow flowing out of the end 8 of the inlet pipe 9 can be supplied. The injector 17 is inclined at an angle α relative to the housing 4.
Der Injektor 17 kann derart angeordnet sein, dass das herausströmende Reduktionsmittel auf die Außenfläche des in das Gehäuse 4 hineinragenden Auslassrohres 12 auftrifft und sehr gut verteilt wird. The injector 17 may be arranged such that the outflowing reducing agent impinges on the outer surface of the projecting into the housing 4 outlet pipe 12 and is very well distributed.
Mittels der Überlappung und der geometrischen Anordnung des Injektors 17 wird eine Blickdichtigkeit oder„Überdeckung erzielt, so dass das Reduktionsmittel nicht ungehindert durch das Ende 11 des Auslassrohres 12 aus der Mischeinrichtung 3 herausströmen kann.  By means of the overlap and the geometrical arrangement of the injector 17, a opacity or "covering is achieved, so that the reducing agent can not flow out of the mixing device 3 unhindered through the end 11 of the outlet tube 12.
Ein Strömungsaufteilungselement 18 ist derart in dem Gehäuse 4 der Mischeinrichtung 3 angeordnet, dass sowohl der aus dem Einlassrohr 9 herausströmende Abgasmassenstrom als auch das Reduktionsmittel in zwei Teilströme in Richtung der Pfeile P2 und P3 (in Fig. 3 dargestellt) aufgeteilt wird. A flow dividing element 18 is arranged in the housing 4 of the mixing device 3 such that both the exhaust gas mass flow flowing out of the inlet pipe 9 and the reducing agent are divided into two partial flows in the direction of the arrows P2 and P3 (shown in FIG. 3).
In dem in Fig. 1 und 2 dargestellten Ausführungsbeispiel ragt das  In the embodiment shown in Fig. 1 and 2, the projecting
Strömungsaufteilungselement 18 teilweise in das Ende 8 des Einlassrohres 9 hinein. Partial flow element 18 partially into the end 8 of the inlet tube 9 inside.
Hierdurch kann die definierte Strömungsaufteilung verbessert werden. An dem zweiten axialen Endabschnitt 6 wird der mit Reduktionsmittel versetzte Abgasmassenstrom derart umgelenkt, dass er entgegen der Hauptströmungsrichtung (Pfeil P4) strömt. As a result, the defined flow distribution can be improved. At the second axial end section 6, the exhaust gas mass flow offset with reducing agent is deflected in such a way that it flows counter to the main flow direction (arrow P4).
Eine weitere Umlenkung in Richtung der Hauptströmungsrichtung (Pfeil P4) erfolgt an dem ersten axialen Endabschnitt 5.  A further deflection in the direction of the main flow direction (arrow P4) takes place at the first axial end section 5.
Das in das Gehäuse 4 der Mischeinrichtung 3 hineinragende Auslassrohr 12 weist unterschiedliche Querschnitte auf. An dem Ende 11 weist das Auslassrohr 12 einen The outlet pipe 12 projecting into the housing 4 of the mixing device 3 has different cross sections. At the end 11, the outlet pipe 12 has a
Querschnitt Q1 auf. An der Öffnung 10 weist das Auslassrohr 12 einen Querschnitt Q2 auf, der größer im Vergleich zu Querschnitt Q1 ist. Mittels der Aufweitung (von dem Querschnitt Q1 zu dem Querschnitt Q2) wird die Strömungsverteilung des aus der Mischeinrichtung 3 herausströmenden und auf die zweite Abgasnachbehandlungseinrichtung 13 treffenden Abgasmassenstromes unterstützt. Weiterhin dient die Außenseite der Aufweitung als Prallfläche für das Reduktionsmittel. Cross section Q1 on. At the opening 10, the outlet pipe 12 has a cross-section Q2, which is larger in comparison to the cross-section Q1. By means of the expansion (from the cross section Q1 to the cross section Q2), the flow distribution of the exhaust gas mass flow flowing out of the mixing device 3 and striking the second exhaust gas aftertreatment device 13 is assisted. Furthermore, the outside of the expansion serves as a baffle for the reducing agent.
Sowohl an der Innenseite des Gehäuses 4 als auch an der Außenseite des Auslassrohres 12 sind Leitelemente 19a und 19b angeordnet, wobei zur Übersichtlichkeit nur zwei Both on the inside of the housing 4 and on the outside of the outlet tube 12 guide elements 19a and 19b are arranged, for clarity, only two
Leitelemente 19a und 19b dargestellt sind. Hierdurch sind eine definierte Strömungslenkung sowie eine Verbesserung der Vermischung möglich. Guide elements 19a and 19b are shown. As a result, a defined flow control and an improvement of the mixing are possible.
Der erste axiale Endabschnitt 5 weist im Vergleich zu der Öffnung 7 kleine Öffnungen 20 auf, durch die der Abgasmassenstrom in die Mischeinrichtung 3 hineinströmen kann. The first axial end portion 5 has in comparison to the opening 7 small openings 20 through which the exhaust gas mass flow can flow into the mixing device 3.
Die kleinen Öffnungen sind in einem Bereich 21 unterhalb des Endes 11 des Auslassrohres 12 angeordnet, so dass eine Blickdichtigkeit gegenüber dem Eintritt des Auslassrohres 12 gegeben ist. The small openings are arranged in a region 21 below the end 11 of the outlet tube 12, so that a opacity against the inlet of the outlet tube 12 is given.
Mittels der kleinen Öffnungen 20 kann in diesem Bereich 21 auf der Innenseite des  By means of the small openings 20 can 21 in this area on the inside of the
Gehäuses 4 die Gefahr von der Bildung von Ablagerungen verringert werden. Housing 4 the risk of the formation of deposits can be reduced.
Das Auslassrohr 12 weist im Bereich 21 am Auslassrohr 12 kleine Öffnungen 22 auf, durch die der Abgasmassenstrom aus der Mischeinrichtung 3 herausströmen kann. Hierdurch kann die Durchmischung verbessert werden. In the region 21 on the outlet pipe 12, the outlet pipe 12 has small openings 22 through which the exhaust gas mass flow can flow out of the mixing device 3. As a result, the mixing can be improved.
In Fig. 2 ist eine zweite Ausführungsform der Mischeinrichtung 3 dargestellt. Diese 2, a second embodiment of the mixing device 3 is shown. These
Mischeinrichtung 3 weist im Vergleich zu der in Fig. 1 dargestellten Mischeinrichtung 3 keine Leitelemente 19a, b sowie keine kleinen Öffnungen 20, 22 auf. In Fig. 3 ist eine dritte Ausführungsform der Mischeinrichtung 3 dargestellt. Im Vergleich zu den in Fig. 1 und Fig. 2 dargestellten Mischeinrichtungen 3 liegt das Einlassrohr 9 sowohl an dem Gehäuse 4 (d. h. Abstand 15 weist den Wert„0" auf) als auch an dem Auslassrohr 12 (d. h. der Abstand 16 weist den Wert„0" auf) an. Mixing device 3, in comparison to the mixing device 3 shown in FIG. 1, no guide elements 19 a, b and no small openings 20, 22 on. FIG. 3 shows a third embodiment of the mixing device 3. Compared to the mixing devices 3 shown in FIGS. 1 and 2, the inlet pipe 9 is located both on the housing 4 (ie, the distance 15 is "0") and on the outlet pipe 12 (ie, the distance 16 is the value "0" on).
Die Mischeinrichtung 3 kann beispielsweise mittels Tiefziehen hergestellt werden. The mixing device 3 can be produced for example by deep drawing.
In den gezeigten Ausführungsbeispielen sind die Achsen des Einlassrohres 9 und des Auslassrohres 12 parallel zur Achse des Gehäuses 4. In the illustrated embodiments, the axes of the inlet pipe 9 and the outlet pipe 12 are parallel to the axis of the housing 4.
Es besteht im Sinne der Erfindung auch die Möglichkeit, die Achse des Einlassrohres 9 und/oder die Achse des Auslassrohres 12 gegenüber der Achse des Gehäuses 4 zu neigen.  It is within the meaning of the invention also possible, the axis of the inlet pipe 9 and / or the axis of the outlet pipe 12 with respect to the axis of the housing 4 to tilt.
Weiterhin können das Einlassrohr 9, das Gehäuse 4 und das Auslassrohr 12 Furthermore, the inlet pipe 9, the housing 4 and the outlet pipe 12
unterschiedliche Querschnittsformen aufweisen. have different cross-sectional shapes.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Abgasstrang 1 exhaust system
2 erste Abgasbehandlungseinrichtung 2 first exhaust treatment device
3 Mischeinrichtung 3 mixing device
4 Gehäuse  4 housing
5 erster axialer Endabschnitt  5 first axial end portion
6 zweiter axialer Endabschnitt 6 second axial end portion
7 Öffnung 7 opening
8 Ende  8 end
9 Einlassrohr  9 inlet pipe
10 Öffnung  10 opening
1 1 Ende  1 1 end
12 Auslassrohr  12 outlet pipe
13 zweite Abgasbehandlungseinrichtung 13 second exhaust treatment device
14 Bereich 14 area
15 Abstand  15 distance
16 Abstand  16 distance
17 Injektor  17 injector
18 Strömungsaufteilungselement 18 flow splitting element
19a Leitelement 19a guiding element
19b Leitelement  19b guide element
20 kleine Öffnung  20 small opening
21 Bereich  21 area
22 kleine Öffnung  22 small opening
P1 Pfeil P1 arrow
P2 Pfeil  P2 arrow
P3 Pfeil  P3 arrow
P4 Pfeil  P4 arrow
Q1 Querschnitt Q1 cross section
Q2 Querschnitt  Q2 cross section
α Winkel α angle

Claims

Ansprüche claims
1. Mischeinrichtung (3) umfassend ein Gehäuse (4) mit einem ersten axialen Endabschnitt (5) sowie einem zweiten axialen Endabschnitt (6), der dem ersten axialen Endabschnitt (5) gegenüberliegt, wobei der erste axiale Endabschnitt (5) eine exzentrische Öffnung (7) aufweist, durch die ein Ende (8) eines Einlassrohres (9) in die Mischeinrichtung (3) hineinragt, wobei durch die exzentrische Öffnung (7) ein Abgasmassenstrom in die Mischeinrichtung (3) hineinströmen kann, wobei der zweite axiale Endabschnitt (6) eine Öffnung (10) aufweist, aus der der Abgasmassenstrom aus der Mischeinrichtung (3) herausströmen kann, dadurch gekennzeichnet, dass durch die Öffnung (10) des zweiten axialen Endabschnitts (6) ein Ende (1 1) eines Auslassrohres (12) in die A mixing device (3) comprising a housing (4) having a first axial end portion (5) and a second axial end portion (6) facing the first axial end portion (5), the first axial end portion (5) having an eccentric aperture (7) through which one end (8) of an inlet pipe (9) projects into the mixing device (3), wherein an exhaust gas mass flow can flow into the mixing device (3) through the eccentric opening (7), wherein the second axial end section (FIG. 6) has an opening (10) from which the exhaust gas mass flow can flow out of the mixing device (3), characterized in that through the opening (10) of the second axial end section (6) has an end (1 1) of an outlet pipe (12) in the
Mischeinrichtung (3) hineinragt, wobei sich das Ende (8) des Einlassrohres (9) und das Ende (1 1) des Auslassrohres (12) longitudinal in einem Bereich (14) überlappen, und wobei der Abgasmassenstrom in einer Hauptströmungsrichtung (P1) sowohl in die Mischeinrichtung (3) hineinströmen als auch aus der Mischeinrichtung (3) herausströmen kann.  Mixture (3) protrudes, wherein the end (8) of the inlet pipe (9) and the end (1 1) of the outlet pipe (12) overlap longitudinally in a region (14), and wherein the exhaust gas mass flow in a main flow direction (P1) both can flow into the mixing device (3) as well as from the mixing device (3) can flow out.
2. Mischeinrichtung (3) nach Anspruch 1 , dadurch gekennzeichnet, dass die 2. mixing device (3) according to claim 1, characterized in that the
Mischeinrichtung (3) einen Injektor (17) aufweist.  Mixing device (3) has an injector (17).
3. Mischeinrichtung (3) nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in dem Gehäuse (4) stromabwärts des Einlassrohres (9) ein Strömungsaufteilungselement (18) angeordnet ist. 3. mixing device (3) according to at least one of the preceding claims, characterized in that in the housing (4) downstream of the inlet tube (9) a flow divider element (18) is arranged.
4. Mischeinrichtung (3) nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass an dem Innenumfang des Gehäuses (4) mindestens ein 4. mixing device (3) according to at least one of the preceding claims, characterized in that on the inner circumference of the housing (4) at least one
Leitelement (19a) angeordnet ist.  Guide element (19a) is arranged.
5. Mischeinrichtung (3) nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass an dem Außenumfang des Auslassrohres (12) mindestens ein Leitelement (19b) angeordnet ist. 5. mixing device (3) according to at least one of the preceding claims, characterized in that on the outer circumference of the outlet tube (12) at least one guide element (19b) is arranged.
6. Mischeinrichtung (3) nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das in das Gehäuse (4) hineinragende Auslassrohr (12) in der Hauptströmungsrichtung (P1) eine Aufweitung von einem ersten Querschnitt (Q1) hin zu einem zweiten Querschnitt (Q2) aufweist. 6. mixing device (3) according to at least one of the preceding claims, characterized in that in the housing (4) projecting outlet pipe (12) in the main flow direction (P1) an expansion from a first cross section (Q1) towards a second cross section ( Q2).
7. Mischeinrichtung (3) nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Einlassrohr (9) um einen Abstand (15) von der Innenwand des Gehäuses (4) entfernt ist. 7. mixing device (3) according to at least one of the preceding claims, characterized in that the inlet pipe (9) by a distance (15) from the inner wall of the housing (4) is removed.
8. Mischeinrichtung (3) nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Einlassrohr (9) in dem Bereich (14) um einen Abstand (16) von dem Ende (11) des Auslassrohres (12) entfernt ist. 8. mixing device (3) according to at least one of the preceding claims, characterized in that the inlet tube (9) in the region (14) by a distance (16) from the end (11) of the outlet tube (12) is removed.
9. Mischeinrichtung (3) nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der erste axiale Endabschnitt (5) mindestens eine kleine Öffnung (20) aufweist. 9. mixing device (3) according to at least one of the preceding claims, characterized in that the first axial end portion (5) has at least one small opening (20).
10. Mischeinrichtung (3) nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Auslassrohr (12) mindestens eine kleine Öffnung (22) aufweist. 10. mixing device (3) according to at least one of the preceding claims, characterized in that the outlet pipe (12) has at least one small opening (22).
PCT/DE2016/100194 2015-05-06 2016-04-26 Mixing device WO2016177361A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102016213409A1 (en) * 2016-07-22 2018-02-08 Robert Bosch Gmbh Mixer device for an exhaust aftertreatment system of a motor vehicle, exhaust aftertreatment system and motor vehicle
DE102019101678A1 (en) * 2019-01-24 2020-07-30 Eberspächer Exhaust Technology GmbH & Co. KG mixer
DE102021109777A1 (en) 2021-04-19 2022-10-20 Purem GmbH Exhaust/Reactant Mixing Assembly

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EP1262644A2 (en) * 2001-06-01 2002-12-04 Nelson Burgess Limited Catalytic converter
EP1716918A1 (en) * 2005-04-28 2006-11-02 Hitachi, Ltd. Fluid mixing apparatus
EP2687697A2 (en) * 2012-07-20 2014-01-22 MAN Truck & Bus AG Mixing device for the aftertreatment of exhaust gases
DE102013205297A1 (en) 2012-03-26 2014-07-03 GM Global Technology Operations, LLC (n.d. Ges. d. Staates Delaware) Exhaust after-treatment system for an internal combustion engine
DE202014102872U1 (en) * 2014-06-10 2014-07-09 Tenneco Gmbh exhaust mixer

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Publication number Priority date Publication date Assignee Title
EP1262644A2 (en) * 2001-06-01 2002-12-04 Nelson Burgess Limited Catalytic converter
EP1716918A1 (en) * 2005-04-28 2006-11-02 Hitachi, Ltd. Fluid mixing apparatus
DE102013205297A1 (en) 2012-03-26 2014-07-03 GM Global Technology Operations, LLC (n.d. Ges. d. Staates Delaware) Exhaust after-treatment system for an internal combustion engine
EP2687697A2 (en) * 2012-07-20 2014-01-22 MAN Truck & Bus AG Mixing device for the aftertreatment of exhaust gases
DE202014102872U1 (en) * 2014-06-10 2014-07-09 Tenneco Gmbh exhaust mixer

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