EP1875052A1 - Connection element arranged between a housing and an exhaust pipe - Google Patents

Connection element arranged between a housing and an exhaust pipe

Info

Publication number
EP1875052A1
EP1875052A1 EP06701047A EP06701047A EP1875052A1 EP 1875052 A1 EP1875052 A1 EP 1875052A1 EP 06701047 A EP06701047 A EP 06701047A EP 06701047 A EP06701047 A EP 06701047A EP 1875052 A1 EP1875052 A1 EP 1875052A1
Authority
EP
European Patent Office
Prior art keywords
connecting element
housing
guide surface
exhaust gas
exhaust pipe
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.)
Withdrawn
Application number
EP06701047A
Other languages
German (de)
French (fr)
Inventor
Marco Ranalli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Faurecia Emissions Control Technologies Germany GmbH
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
Publication of EP1875052A1 publication Critical patent/EP1875052A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • 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
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • 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
    • B01F2025/91—Direction of flow or arrangement of feed and discharge openings
    • B01F2025/913—Vortex flow, i.e. flow spiraling in a tangential direction and moving in an axial direction
    • 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • 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
    • F01N3/18—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]
    • 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

Definitions

  • the invention relates to a connecting element between a housing and an exhaust pipe, in particular a cone.
  • such a connecting element serves to bring about the transition from a large flow cross section, such as is present in the interior of a housing, to a smaller flow cross section, as is present in an exhaust gas pipe.
  • the connecting element acts like a funnel.
  • the housing can be, for example, a silencer, a housing for a catalytic converter or a housing for a filter.
  • baffles can be attached in the exhaust pipe directly in front of or behind the point at which the medium is introduced, which ensure that the exhaust gas is swirled and accordingly ensures a good distribution of the introduced medium.
  • Guide surfaces in the interior of the exhaust pipe are problematic both in terms of the effort involved in the installation and in terms of strength.
  • the object of the invention is to ensure a good distribution of an introduced medium in the exhaust gas flow with little effort and high reliability.
  • the connecting element is provided on its inside with at least one guide surface which can give the exhaust gas flow an angular momentum.
  • the invention is based on the basic idea of imparting a swirl to the exhaust gas flow as soon as it leaves a housing, which is arranged upstream of the point at which the medium is introduced, which leads to good swirling and thus to a good distribution of the medium in the exhaust gas flow leads.
  • the connecting element between the housing and the exhaust pipe is particularly suitable for this, since it has comparatively large dimensions, so that it is much easier than in a narrow exhaust pipe to take the appropriate precautions with which a swirl can be forced on the exhaust gas flow.
  • the guide surface with which an angular momentum can be given to the exhaust gas flow can either be provided on at least one guide plate which is attached to the connecting element, or preferably be formed by plastically deformed wall sections of the connecting element.
  • This embodiment is particularly advantageous since no additional components have to be attached. The manufacturing effort is thus reduced. There is also no risk that components can come loose from the connecting element and damage other components of the exhaust system.
  • the guide surfaces are preferably formed by at least one screw track which is pressed into the wall of the connecting element.
  • the corresponding plastic deformation of the wall of the guide element can be achieved with little effort.
  • a housing 10 can be seen, in the interior of which a substrate 12 is arranged.
  • the function of the substrate is not necessary for understanding the invention. Instead of the substrate, the housing 10 could also surround a silencer.
  • connection element 14 connects downstream of the housing 10, the main function of which is to reduce the cross section of the flow path for the exhaust gas from the cross section of the housing 10 to the cross section of an exhaust pipe 16, which connects downstream of the connection element 14 .
  • an injection device 18 is arranged downstream of the connecting element 14, by means of which a medium such as fuel or urea can be introduced into the interior of the exhaust pipe 16 and thus into the exhaust gas flow.
  • the connecting element 14 is designed with two shells and has an outer shell 20 which is connected to the exhaust pipe 16 or the housing 10 via two flanges 22, 24.
  • An inner shell 26 is arranged inside the outer shell 20 and is deformed such that a circumferential screw path 28 is formed.
  • the screw path 28 has a helical guide surface 30 which is oriented approximately radially with respect to the main flow direction of the exhaust gas. Since the guide surface 30 is oriented obliquely to the main flow direction of the exhaust gas, it gives the exhaust gas flow an angular momentum which leads to a particularly good mixing of the medium introduced by the injection device 18 with the exhaust gas flow.
  • the guide surface 30 can be produced in a simple manner by plastically deforming the inner shell, in particular by deep drawing. It is apparent that the flow conditions can be adjusted by appropriately selecting the pitch of the helical path 28.
  • a multi-start screw path can also be used, which presents itself in the form of a plurality of separate guide surfaces 30 with a correspondingly large pitch, which extend over a circumferential range of less than 360 ° extend.
  • the connecting element can also have a single-shell design.
  • the wall of the connecting element is stable enough despite the pressed-in guide surfaces.
  • the guide surfaces visible from the outside in the case of a single-shell connecting element do not impair the function.

Landscapes

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

Abstract

The invention relates to a connection element (14) which is arranged between a housing (10) and an exhaust pipe (16), in particular a cone, which is characterised in that at least one guiding surface (30) is provided on the inner-side of the connection element (14), said guiding surface enabling a rotative impulsion of the waste gas flow.

Description

Verbindungselement zwischen einem Gehäuse und einem Abgasrohr Connecting element between a housing and an exhaust pipe
Die Erfindung betrifft ein Verbindungselement zwischen einem Gehäuse und einem Abgasrohr, insbesondere einen Konus.The invention relates to a connecting element between a housing and an exhaust pipe, in particular a cone.
Bei Abgasanlagen insbesondere für Kraftfahrzeuge dient ein solches Verbindungselement dazu, den Übergang von einem großen Strömungsquerschnitt, wie er im Inneren eines Gehäuses vorliegt, auf einen kleineren Strömungsquerschnitt, wie er in einem Abgasrohr vorliegt, zu bewerkstelligen. Allgemein ausgedrückt wirkt das Verbindungselement ähnlich wie ein Trichter. Bei dem Gehäuse kann es sich beispielsweise um einen Schalldämpfer, ein Gehäuse für einen Katalysator oder ein Gehäuse für einen Filter handeln.In exhaust gas systems, in particular for motor vehicles, such a connecting element serves to bring about the transition from a large flow cross section, such as is present in the interior of a housing, to a smaller flow cross section, as is present in an exhaust gas pipe. Generally speaking, the connecting element acts like a funnel. The housing can be, for example, a silencer, a housing for a catalytic converter or a housing for a filter.
Bei modernen Abgassystemen ist es erforderlich, in den Abgasstrom ein Medium einzubringen, um bestimmte Reaktionen hervorzurufen. Beispielsweise kann stromaufwärts eines Dieselpartikelfilters Kraftstoff eingespritzt werden, damit die im Filter zurückgehaltenen Partikel kontrolliert verbrennen. Auch kann bei einem SCR-System Harnstoff eingespritzt werden, um Ammoniak als Reduktionsmittel für die im Abgas vorhandenen Stickoxide einzubringen. 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 necessary to introduce a medium into the exhaust gas flow in order to cause certain reactions. For example, fuel can be injected upstream of a diesel particle filter so that the particles retained in the filter burn in a controlled manner. In an SCR system, urea can also be injected in order to introduce ammonia as a reducing agent for the nitrogen oxides present in the exhaust gas. The general rule here 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.
Es gibt verschiedene Versuche, das eingebrachte Medium möglichst gleichmäßig im Abgas zu verteilen. Beispielsweise können im Abgasrohr unmittelbar vor oder hinter der Stelle, an der das Medium eingebracht wird, Leitflächen angebracht werden, die für eine Verwirbelung des Abgases und dementsprechend für eine gute Verteilung des eingebrachten Mediums sorgen. Leitflächen im Inneren des Abgasrohres sind jedoch sowohl hinsichtlich des Aufwandes bei der Anbringung als auch hinsichtlich der Festigkeit problematisch. Die Aufgabe der Erfindung besteht darin, mit geringem Aufwand und hoher Zuverlässigkeit für eine gute Verteilung eines eingebrachten Mediums im Abgasstrom zu sorgen.There are various attempts to distribute the introduced medium as evenly as possible in the exhaust gas. For example, baffles can be attached in the exhaust pipe directly in front of or behind the point at which the medium is introduced, which ensure that the exhaust gas is swirled and accordingly ensures a good distribution of the introduced medium. Guide surfaces in the interior of the exhaust pipe, however, are problematic both in terms of the effort involved in the installation and in terms of strength. The object of the invention is to ensure a good distribution of an introduced medium in the exhaust gas flow with little effort and high reliability.
Zu diesem Zweck ist erfindungsgemäß vorgesehen, daß das Verbindungselement auf seiner Innenseite mit mindestens einer Führungsfläche versehen ist, die dem Abgasstrom einen Drehimpuls erteilen kann. Die Erfindung beruht auf dem Grundgedanken, dem Abgasstrom bereits beim Verlassen eines Gehäuses, das stromaufwärts von der Stelle angeordnet ist, an der das Medium eingebracht wird, einen Drall zu erteilen, der zu einer guten Verwirbelung und dadurch zu einer guten Verteilung des Mediums im Abgasstrom führt. Das Verbindungselement zwischen dem Gehäuse und dem Abgasrohr ist hierfür besonders geeignet, da es vergleichsweise große Abmessungen hat, so daß es sehr viel leichter als in einem engen Abgasrohr ist, die entsprechenden Vorkehrungen zu treffen, mit denen dem Abgasstrom ein Drall aufgezwungen werden kann.For this purpose, it is provided according to the invention that the connecting element is provided on its inside with at least one guide surface which can give the exhaust gas flow an angular momentum. The invention is based on the basic idea of imparting a swirl to the exhaust gas flow as soon as it leaves a housing, which is arranged upstream of the point at which the medium is introduced, which leads to good swirling and thus to a good distribution of the medium in the exhaust gas flow leads. The connecting element between the housing and the exhaust pipe is particularly suitable for this, since it has comparatively large dimensions, so that it is much easier than in a narrow exhaust pipe to take the appropriate precautions with which a swirl can be forced on the exhaust gas flow.
Die Führungsfläche, mit welcher dem Abgasstrom ein Drehimpuls erteilt werden kann, kann entweder an mindestens einem Leitblech vorgesehen sein, das am Verbindungselement angebracht wird, oder vorzugsweise durch plastisch verformte Wandabschnitte des Verbindungselements gebildet sein. Diese Ausführungsform ist besonders vorteilhaft, da keine zusätzlichen Bauteile angebracht werden müssen. Somit verringert sich der Herstellungsaufwand. Auch besteht keinerlei Gefahr, daß sich Bauteile vom Verbindungselement lösen können und andere Bauteile des Abgassystems beschädigen.The guide surface with which an angular momentum can be given to the exhaust gas flow can either be provided on at least one guide plate which is attached to the connecting element, or preferably be formed by plastically deformed wall sections of the connecting element. This embodiment is particularly advantageous since no additional components have to be attached. The manufacturing effort is thus reduced. There is also no risk that components can come loose from the connecting element and damage other components of the exhaust system.
Vorzugsweise sind die Führungsflächen durch mindestens eine Schraubenbahn gebildet, die in die Wandung des Verbindungselements eingepreßt ist. Die entsprechende plastische Verformung der Wandung des Führungselementes kann mit geringem Aufwand erzielt werden.The guide surfaces are preferably formed by at least one screw track which is pressed into the wall of the connecting element. The corresponding plastic deformation of the wall of the guide element can be achieved with little effort.
Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen. Die Erfindung wird nachfolgend anhand einer bevorzugten Austuhrungsform beschrieben, die in der beigefügten einzigen Zeichnung dargestellt ist. In dieser ist schematisch ein Schnitt durch ein Gehäuse, ein Verbindungselement und ein sich daran anschließendes Abgasrohr gezeigt.Advantageous embodiments of the invention result from the subclaims. The invention is described below with reference to a preferred embodiment, which is shown in the accompanying single drawing. This schematically shows a section through a housing, a connecting element and an adjoining exhaust pipe.
In der einzigen Figur ist ein Gehäuse 10 zu sehen, in dessen Innenraum ein Substrat 12 angeordnet ist. Die Funktion des Substrates ist für das Verständnis der Erfindung nicht erforderlich. Anstelle des Substrates könnte das Gehäuse 10 auch einen Schalldämpfer umgeben.In the single figure, a housing 10 can be seen, in the interior of which a substrate 12 is arranged. The function of the substrate is not necessary for understanding the invention. Instead of the substrate, the housing 10 could also surround a silencer.
Das Gehäuse 10 wird in der Richtung des Pfeils P von Abgas durchströmt. In der Strömungsrichtung betrachtet schließt sich stromabwärts an das Gehäuse 10 ein Verbindungselement 14 an, dessen Hauptfunktion darin besteht, den Querschnitt des Strömungsweges für das Abgas vom Querschnitt des Gehäuses 10 auf den Querschnitt eines Abgasrohres 16 zu verringern, das sich stromabwärts an das Verbindungselement 14 anschließt.Exhaust gas flows through the housing 10 in the direction of the arrow P. Viewed in the flow direction, a connection element 14 connects downstream of the housing 10, the main function of which is to reduce the cross section of the flow path for the exhaust gas from the cross section of the housing 10 to the cross section of an exhaust pipe 16, which connects downstream of the connection element 14 .
Im Abgasrohr 16 ist stromabwärts des Verbindungselementes 14 eine Einspritzvorrichtung 18 angeordnet, mittels der ein Medium wie Kraftstoff oder Harnstoff in das Innere des Abgasrohres 16 und damit in den Abgasstrom eingebracht werden kann.In the exhaust pipe 16, an injection device 18 is arranged downstream of the connecting element 14, by means of which a medium such as fuel or urea can be introduced into the interior of the exhaust pipe 16 and thus into the exhaust gas flow.
Das Verbindungselement 14 ist bei der gezeigten Ausführungsform zweischalig ausgeführt und weist eine Außenschale 20 auf, die über zwei Flansche 22, 24 mit dem Abgasrohr 16 bzw. dem Gehäuse 10 verbunden ist. Innerhalb der Außenschale 20 ist eine Innenschale 26 angeordnet, die so verformt ist, daß eine umlaufende Schraubenbahn 28 gebildet ist. Die Schraubenbahn 28 weist eine schraubenförmige Führungsfläche 30 auf, die bezogen auf die Hauptströmungsrichtung des Abgases etwa radial ausgerichtet ist. Da die Führungsfläche 30 schräg zur Hauptströmungsrichtung des Abgases ausgerichtet ist, erteilt sie dem Abgasstrom einen Drehimpuls, der zu einer besonders guten Vermischung des durch die Einspritzvorrichtung 18 eingebrachten Mediums mit dem Abgasstrom führt. Da mindestens die Innenschale 26 des Verbindungselementes 14 aus Blech besteht, kann die Führungsfläche 30 in einfacher Weise durch plastisches Verformen der Innenschale hergestellt werden, insbesondere durch Tiefziehen. Es ist offensichtlich, daß die Strömungsverhältnisse durch die geeignete Auswahl der Steigung der Schraubenbahn 28 eingestellt werden können. So kann anstelle einer einzigen umlaufenden, also eingängigen Schraubenbahn, wie sie in der Zeichnung dargestellt ist, auch einen mehrgängige Schraubenbahn verwendet werden, die bei entsprechend großer Steigung sich in der Form mehrerer separater Führungsflächen 30 präsentieren, die sich über einen Umfangsbereich von weniger als 360° erstrecken.In the embodiment shown, the connecting element 14 is designed with two shells and has an outer shell 20 which is connected to the exhaust pipe 16 or the housing 10 via two flanges 22, 24. An inner shell 26 is arranged inside the outer shell 20 and is deformed such that a circumferential screw path 28 is formed. The screw path 28 has a helical guide surface 30 which is oriented approximately radially with respect to the main flow direction of the exhaust gas. Since the guide surface 30 is oriented obliquely to the main flow direction of the exhaust gas, it gives the exhaust gas flow an angular momentum which leads to a particularly good mixing of the medium introduced by the injection device 18 with the exhaust gas flow. Since at least the inner shell 26 of the connecting element 14 consists of sheet metal, the guide surface 30 can be produced in a simple manner by plastically deforming the inner shell, in particular by deep drawing. It is apparent that the flow conditions can be adjusted by appropriately selecting the pitch of the helical path 28. Instead of a single revolving, i.e. single-start screw path, as shown in the drawing, a multi-start screw path can also be used, which presents itself in the form of a plurality of separate guide surfaces 30 with a correspondingly large pitch, which extend over a circumferential range of less than 360 ° extend.
Abweichend von der gezeigten Ausführungsform kann das Verbindungselement auch einschalig ausgeführt sein. Die Wandung des Verbindungselementes ist trotz der eingepreßten Führungsflächen stabil genug. Die bei einem einschaligen Verbindungselement von außen sichtbaren Führungsflächen beeinträchtigen die Funktion nicht. In a departure from the embodiment shown, the connecting element can also have a single-shell design. The wall of the connecting element is stable enough despite the pressed-in guide surfaces. The guide surfaces visible from the outside in the case of a single-shell connecting element do not impair the function.
B ezugszeichenliste :LIST OF REFERENCES:
10: Gehäuse10: housing
12: Substrat12: substrate
14: Verbindungsabschnitt14: connecting section
16: Abgasrohr16: exhaust pipe
18: Einspritzvorrichtung18: Injector
20: Außenschale20: outer shell
22: Flansch22: flange
24: Flansch24: flange
26: Innenschale26: inner shell
28: Schraubenbahn28: screw path
30: Führungsfläche 30: guide surface

Claims

Patentansprüche Claims
1. Verbindungselement (14) zwischen einem Gehäuse (10) und einem Abgasrohr (16), insbesondere Konus, dadurch gekennzeichnet, daß auf der Innenseite des Verbindungselements (14) mindestens eine Führungsfiäche (30) vorgesehen ist, die dem Abgasstrom einen Drehimpuls erteilen kann.1. Connecting element (14) between a housing (10) and an exhaust pipe (16), in particular cone, characterized in that on the inside of the connecting element (14) at least one guide surface (30) is provided which can give the exhaust gas flow an angular momentum .
2. Verbindungselement nach Anspruch 1, dadurch gekennzeichnet, daß die Führungsfläche (30), in der Strömungsrichtung des Abgasstroms betrachtet, schräg verläuft.2. Connecting element according to claim 1, characterized in that the guide surface (30), viewed in the flow direction of the exhaust gas stream, runs obliquely.
3. Verbindungselement nach Anspruch 2, dadurch gekennzeichnet, daß die Führungsfläche (30) schraubenförmig verläuft.3. Connecting element according to claim 2, characterized in that the guide surface (30) extends helically.
4. Verbindungselement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Führungsfiäche (30) durch mindestens ein Leitblech gebildet ist, das an der Innenseite des Verbindungselements angebracht ist.4. Connecting element according to one of the preceding claims, characterized in that the guide surface (30) is formed by at least one guide plate which is attached to the inside of the connecting element.
5. Verbindungselement nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Führungsfläche (30) durch plastisch verformte Wandabschnitte des Verbindungselements (14) gebildet ist.5. Connecting element according to one of claims 1 to 3, characterized in that the guide surface (30) is formed by plastically deformed wall sections of the connecting element (14).
6. Verbindungselement nach Anspruch 5, dadurch gekennzeichnet, daß die Führungsfläche (30) durch mindestens eine Schraubenbahn (28) gebildet ist.6. Connecting element according to claim 5, characterized in that the guide surface (30) is formed by at least one screw track (28).
7. Verbindungselement nach Anspruch 6, dadurch gekennzeichnet, daß die Führungsfläche (30) radial ausgerichtet ist.7. Connecting element according to claim 6, characterized in that the guide surface (30) is aligned radially.
8. Verbindungselement nach einem der vorhergehenden Ansprüche, dadurch ^kennzeichnet, daß es mehrwandig ausgeführt ist. 8. Connecting element according to one of the preceding claims, characterized in ^ that it is multi-walled.
EP06701047A 2005-04-29 2006-01-26 Connection element arranged between a housing and an exhaust pipe Withdrawn EP1875052A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005020045A DE102005020045A1 (en) 2005-04-29 2005-04-29 Connection unit e.g. chuck, for use in exhaust system of motor vehicle, is arranged between housing and exhaust pipe, and guide surface is arranged transverse to main stream direction of exhaust gas to give angular momentum to gas stream
PCT/EP2006/000688 WO2006117028A1 (en) 2005-04-29 2006-01-26 Connection element arranged between a housing and an exhaust pipe

Publications (1)

Publication Number Publication Date
EP1875052A1 true EP1875052A1 (en) 2008-01-09

Family

ID=36084347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06701047A Withdrawn EP1875052A1 (en) 2005-04-29 2006-01-26 Connection element arranged between a housing and an exhaust pipe

Country Status (6)

Country Link
US (1) US20080196386A1 (en)
EP (1) EP1875052A1 (en)
KR (1) KR20070119743A (en)
CN (1) CN101166893A (en)
DE (1) DE102005020045A1 (en)
WO (1) WO2006117028A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2966197B1 (en) 2010-10-18 2014-08-15 Faurecia Sys Echappement EXHAUST LINE FOR MOTOR VEHICLE.
DE102014100472A1 (en) * 2014-01-16 2015-07-16 Eberspächer Exhaust Technology GmbH & Co. KG COMPONENTS OF DIFFERENT MATERIALS MADE OF ASSEMBLY OF EXHAUST SYSTEM WITH IMPROVED DURABILITY

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2528674A (en) * 1948-09-07 1950-11-07 Joseph J Thomas Muffler with inner flexible corrugated conduit
FR1554785A (en) * 1967-11-21 1969-01-24
US4714279A (en) * 1986-11-03 1987-12-22 Lincoln Custeau Exhaust pipe coupler
DE3733402A1 (en) * 1987-10-02 1989-04-13 Emitec Emissionstechnologie CATALYST ARRANGEMENT WITH FLOW GUIDE
DE19630222C1 (en) * 1996-07-26 1998-02-19 Daimler Benz Ag Device for decoupling torsional vibrations
US5916134A (en) * 1997-09-10 1999-06-29 Industrial Technology Research Institute Catalytic converter provided with vortex generator
DE19839754B4 (en) * 1998-09-01 2007-05-24 Gaiser, Gerd, Dr.-Ing. Cleaning device for exhaust gases
KR100308952B1 (en) * 1999-05-10 2001-09-26 이계안 Oblique close coupled catalyst exit c0nnector
DE10060808B4 (en) * 2000-12-07 2004-12-02 Robert Bosch Gmbh emission control system
US6415603B1 (en) * 2001-10-04 2002-07-09 Ford Global Technologies, Inc. Flexible connector assembly
US6715799B2 (en) * 2002-04-16 2004-04-06 David J. Hardy Corrugated pipe coupling having six degrees of freedom
US7462332B2 (en) * 2003-06-18 2008-12-09 Delphi Technologies, Inc. Apparatus and method for manufacturing a catalytic converter
KR100735940B1 (en) * 2005-06-15 2007-07-06 주식회사 에스제이엠 Flexible Tube for Exhaust Pipe of automobile
US7506667B1 (en) * 2008-02-27 2009-03-24 Paccar Inc Flex stack

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006117028A1 *

Also Published As

Publication number Publication date
KR20070119743A (en) 2007-12-20
DE102005020045A1 (en) 2006-11-02
US20080196386A1 (en) 2008-08-21
WO2006117028A1 (en) 2006-11-09
CN101166893A (en) 2008-04-23

Similar Documents

Publication Publication Date Title
DE102011051875B4 (en) DOSING MODULE FOR A VEHICLE EXHAUST TREATMENT SYSTEM
EP2813679B1 (en) Exhaust gas unit for a combustion engine
EP1206630B1 (en) Device for introducing an aggregate into an exhaust gas
EP2090761B1 (en) Exhaust gas treatment system for an internal combustion engine
EP2985434B1 (en) Exhaust gas purifying apparatus for a vehicle, in particular for a commercial vehicle
WO2007115748A1 (en) Assembly for mixing a medium with the exhaust-gas flow of a motor-vehicle exhaust-gas system
EP3443209B1 (en) Exhaust-gas aftertreatment device with catalytic converter and mixing device
DE112009001055T5 (en) Exhaust element comprising a static means for admixing an additive to exhaust gases
DE102012014334A1 (en) Mixing device for aftertreatment of exhaust gases
DE112017007996T5 (en) Injector cone like a Venturi nozzle
DE102010021040A1 (en) Mixer and exhaust system
EP3500739B1 (en) Exhaust gas aftertreatment device for an internal combustion engine of a motor vehicle
EP2726718A1 (en) Device and method for introducing a reducing agent into an exhaust train
WO2007134735A1 (en) Turbulizer for exhaust gas system
DE102008029809A1 (en) Static mixing element for exhaust system arrangement of internal combustion engine for mixing nitrogen oxides exhaust gas stream with aqueous carbamide solution, has deviation elements extending from lattice-like component to center
EP4086439B1 (en) Exhaust gas treatment module
DE102008053669A1 (en) Exhaust system for a vehicle
EP1875052A1 (en) Connection element arranged between a housing and an exhaust pipe
EP3018315B1 (en) Catalyst device for a stationary combustion engine
DE112019003201T5 (en) LARGE ENGINE MIXER FOR EXHAUST SYSTEM
DE102013223296A1 (en) Injection module and exhaust system with injection module
WO2008077636A1 (en) Assembly for mixing a medium with the exhaust gas of an exhaust system of an internal combustion engine
EP3808949B1 (en) Mixer arrangement
DE102015225076A1 (en) SCR system for a vehicle and reductant supply device
DE102015209165B4 (en) Exhaust gas treatment device for an internal combustion engine

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20071108

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR

RBV Designated contracting states (corrected)

Designated state(s): DE ES FR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20081002

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20090213