US20080196386A1 - Connection Element Arranged Between a Housing and an Exhaust Pipe - Google Patents

Connection Element Arranged Between a Housing and an Exhaust Pipe Download PDF

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Publication number
US20080196386A1
US20080196386A1 US11/912,611 US91261106A US2008196386A1 US 20080196386 A1 US20080196386 A1 US 20080196386A1 US 91261106 A US91261106 A US 91261106A US 2008196386 A1 US2008196386 A1 US 2008196386A1
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US
United States
Prior art keywords
connecting element
housing
exhaust gas
exhaust pipe
guide surface
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.)
Abandoned
Application number
US11/912,611
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
Individual
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 Individual filed Critical Individual
Assigned to EMCON TECHNOLOGIES GERMANY (AUGSBURG) GMBH reassignment EMCON TECHNOLOGIES GERMANY (AUGSBURG) GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RANALLI, MARCO
Publication of US20080196386A1 publication Critical patent/US20080196386A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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, particularly a cone.
  • one such connecting element serves to adapt a large flow cross section, such as in the interior of a housing, to a smaller flow cross section such as in an exhaust pipe.
  • the connecting element acts like a funnel.
  • the housing concerned may be, for instance, a silencer, a housing for a catalyst or a housing for a filter.
  • deflectors may be sited directly upstream or downstream of the location in the exhaust pipe at which the medium is injected so that the exhaust gas is swirled to ensure a good distribution of the injected medium.
  • engineering deflectors in the interior of the exhaust pipe is a problem both as regards the complications in siting them and as regards strength considerations.
  • the object of the invention is to achieve a good distribution of the injected medium in the exhaust gas flow with minimum complication and high reliability.
  • the connecting element is provided at its interior with at least one guide surface capable of pulsing the exhaust gas flow into rotation.
  • the gist of the invention is to swirl the exhaust gas flow as soon as it leaves a housing sited upstream from the location at which the medium is injected, resulting in good swirling and thus a good distribution of the medium in the exhaust gas flow.
  • the connecting element between the housing and the exhaust pipe is particularly suitable for this purpose since it is relatively expansive so that it is now much easier, than in a narrow exhaust pipe, to correspondingly engineer swirling the exhaust gas flow.
  • the guide surface with which the exhaust gas flow is pulsed into rotation may be provided at least one deflector attached to the connecting element or, preferably, by plastic deformation of the wall sections of the connecting element.
  • the guide surface is formed by at least one helicoidal path impressed in the wall of the connecting element. Plastic deformation of the wall of the swirler surface area in this way is achievable with few complications.
  • a housing 10 in the interior of which a substrate 12 is arranged, the function of which is immaterial to understanding the invention.
  • the housing 10 could also enclose a silencer.
  • the housing 10 has a through flow of exhaust gas in the direction of the arrow P. Viewed in the direction of flow the housing 10 is connected downstream by a connecting element 14 having the main function of reducing the flow cross section for the exhaust gas from that of the housing 10 to that of a exhaust pipe 16 attached downstream to the connecting element 14 .
  • an injector 18 In the exhaust pipe 16 downstream of the connecting element 14 is an injector 18 by means of which a medium such as fuel or urea can be injected into the interior of the exhaust pipe 16 and thus into the exhaust gas flow.
  • the connecting element 14 in the embodiment as shown is configured two-shelled, i.e. it comprising an outer shell 20 connected via two flanges 22 , 24 to the exhaust pipe 16 and housing 10 respectively.
  • an inner shell 26 Located within the outer shell 20 is an inner shell 26 shaped so that a helical pathway 28 is formed circumferentially.
  • the helical pathway 28 comprises a helicoidal guide or swirler surface 30 which is oriented more or less radial to the main direction of flow of the exhaust gas. Since the swirler surface 30 is oriented at an angle to the main direction of flow of the exhaust gas it pulses the exhaust gas flow into rotation, resulting in a particularly good admixture of the medium injected by the injector 18 and the exhaust gas flow.
  • the swirler surface 30 can be simply shaped by plastic deformation of the inner shell 26 , particularly by deep drawing. It will readily be appreciated that the flow response is set by suitably selecting the pitch of the helical pathway 28 . Thus, instead of a single helical pathway a multiple helical pathway may be employed which with a correspondingly larger pitch presents itself in the form of a plurality of separate swirler surfaces 30 covering a circumferential range of less than 360°.
  • the connecting element may also be configured as a single-shell element, the wall of the connecting element being sufficiently rugged despite the impressed swirler surface areas.
  • the fact that the swirler surface is visible to the outside in a single-shell connecting element is of no detriment to the wanted 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

A connecting element between a housing and an exhaust pipe, particularly a cone, is characterized in that the connecting element is provided at its interior with at least one guide surface capable of pulsing the exhaust gas flow into rotation.

Description

  • The invention relates to a connecting element between a housing and an exhaust pipe, particularly a cone.
  • In exhaust systems, particularly for motor vehicles, one such connecting element serves to adapt a large flow cross section, such as in the interior of a housing, to a smaller flow cross section such as in an exhaust pipe. Generally expressed, the connecting element acts like a funnel. The housing concerned may be, for instance, a silencer, a housing for a catalyst or a housing for a filter.
  • In modern exhaust systems it is necessary to inject a medium into the exhaust gas flow to produce certain reactions. For example, upstream of a Diesel particle filter, fuel may be injected so that the particles retained in the filter are subjected to controlled combustion. In an SCR system it may also be provided for that urea is injected to infuse ammonia as a means for reducing the nitrous oxides in the exhaust gas, it being generally a requirement that the injected medium is evenly distributed in the exhaust gas flow for a uniform effect.
  • Various attempts have been made to distribute the injected medium uniformly in the exhaust gas. For example, deflectors may be sited directly upstream or downstream of the location in the exhaust pipe at which the medium is injected so that the exhaust gas is swirled to ensure a good distribution of the injected medium. However, engineering deflectors in the interior of the exhaust pipe is a problem both as regards the complications in siting them and as regards strength considerations.
  • The object of the invention is to achieve a good distribution of the injected medium in the exhaust gas flow with minimum complication and high reliability.
  • For this purpose it is provided for in accordance with the invention that the connecting element is provided at its interior with at least one guide surface capable of pulsing the exhaust gas flow into rotation. The gist of the invention is to swirl the exhaust gas flow as soon as it leaves a housing sited upstream from the location at which the medium is injected, resulting in good swirling and thus a good distribution of the medium in the exhaust gas flow. The connecting element between the housing and the exhaust pipe is particularly suitable for this purpose since it is relatively expansive so that it is now much easier, than in a narrow exhaust pipe, to correspondingly engineer swirling the exhaust gas flow.
  • The guide surface with which the exhaust gas flow is pulsed into rotation may be provided at least one deflector attached to the connecting element or, preferably, by plastic deformation of the wall sections of the connecting element. This aspect is particularly of advantage since no additional components need to be attached in thus simplifying production, whilst eliminating the risk of components becoming detached from the connecting element and damaging other components of the exhaust system.
  • Preferably the guide surface is formed by at least one helicoidal path impressed in the wall of the connecting element. Plastic deformation of the wall of the swirler surface area in this way is achievable with few complications.
  • Advantageous aspects of the invention read from the sub-claims.
  • The invention will now be described by way of a preferred embodiment as shown in the attached sole drawing depicting diagrammatically a section through a housing, a connecting element and an attached exhaust pipe.
  • Shown in the sole FIGURE is a housing 10, in the interior of which a substrate 12 is arranged, the function of which is immaterial to understanding the invention. Instead of the substrate 12 the housing 10 could also enclose a silencer.
  • The housing 10 has a through flow of exhaust gas in the direction of the arrow P. Viewed in the direction of flow the housing 10 is connected downstream by a connecting element 14 having the main function of reducing the flow cross section for the exhaust gas from that of the housing 10 to that of a exhaust pipe 16 attached downstream to the connecting element 14.
  • In the exhaust pipe 16 downstream of the connecting element 14 is an injector 18 by means of which a medium such as fuel or urea can be injected into the interior of the exhaust pipe 16 and thus into the exhaust gas flow.
  • The connecting element 14 in the embodiment as shown is configured two-shelled, i.e. it comprising an outer shell 20 connected via two flanges 22, 24 to the exhaust pipe 16 and housing 10 respectively. Located within the outer shell 20 is an inner shell 26 shaped so that a helical pathway 28 is formed circumferentially. The helical pathway 28 comprises a helicoidal guide or swirler surface 30 which is oriented more or less radial to the main direction of flow of the exhaust gas. Since the swirler surface 30 is oriented at an angle to the main direction of flow of the exhaust gas it pulses the exhaust gas flow into rotation, resulting in a particularly good admixture of the medium injected by the injector 18 and the exhaust gas flow.
  • Since at least the inner shell 26 of the connecting element 14 is made of sheet metal, the swirler surface 30 can be simply shaped by plastic deformation of the inner shell 26, particularly by deep drawing. It will readily be appreciated that the flow response is set by suitably selecting the pitch of the helical pathway 28. Thus, instead of a single helical pathway a multiple helical pathway may be employed which with a correspondingly larger pitch presents itself in the form of a plurality of separate swirler surfaces 30 covering a circumferential range of less than 360°.
  • In an aspect different to that as shown, the connecting element may also be configured as a single-shell element, the wall of the connecting element being sufficiently rugged despite the impressed swirler surface areas. The fact that the swirler surface is visible to the outside in a single-shell connecting element is of no detriment to the wanted function.
    • LIST OF REFERENCE NUMERALS
      • 10 housing
      • 12 substrate
      • 14 connecting section
      • 16 exhaust pipe
      • 18 injector
      • 20 outer shell
      • 22 flange
      • 24 flange
      • 26 inner shell
      • 28 helical pathway
      • 30 swirler surface area

Claims (8)

1.-8. (canceled)
9. A connecting element between a housing and an exhaust pipe, the connecting element having at its interior at least one guide surface formed by plastic deformed wall sections of the connecting element capable of pulsing the exhaust gas flow into rotation.
10. The connecting element of claim 9, wherein the guide surface, as viewed in the direction of exhaust gas flow, is oriented at an angle.
11. The connecting element of claim 10, wherein the guide surface is formed helicoidal.
12. The connecting element of claim 9, wherein the guide surface is formed by at least one helical pathway.
13. The connecting element of claim 12, wherein the guide surface is oriented radially.
14. The connecting element of claim 9, wherein the connecting element is configured multi-walled.
15. The connecting element of claim 9, wherein the connecting element is configured as a cone.
US11/912,611 2005-04-29 2006-01-26 Connection Element Arranged Between a Housing and an Exhaust Pipe Abandoned US20080196386A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005020045.1 2005-04-29
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
US20080196386A1 true US20080196386A1 (en) 2008-08-21

Family

ID=36084347

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/912,611 Abandoned US20080196386A1 (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

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KR20070119743A (en) 2007-12-20

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