EP2474720A1 - Vibration decoupling element for an exhaust line with an integrated mixer and manufacturing procedure of said element - Google Patents

Vibration decoupling element for an exhaust line with an integrated mixer and manufacturing procedure of said element Download PDF

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Publication number
EP2474720A1
EP2474720A1 EP11194056A EP11194056A EP2474720A1 EP 2474720 A1 EP2474720 A1 EP 2474720A1 EP 11194056 A EP11194056 A EP 11194056A EP 11194056 A EP11194056 A EP 11194056A EP 2474720 A1 EP2474720 A1 EP 2474720A1
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EP
European Patent Office
Prior art keywords
mixer
element according
central portion
cylinder
blades
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.)
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Application number
EP11194056A
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German (de)
French (fr)
Inventor
Gautier Dekerle
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PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP2474720A1 publication Critical patent/EP2474720A1/en
Withdrawn legal-status Critical Current

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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
    • B01F25/4315—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed 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
    • F01N3/24—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
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
    • F01N13/1816—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled

Definitions

  • the present invention relates to a vibratory decoupling element intended to be placed in the line of the exhaust gases of a heat engine, when this line is equipped with a catalyst for treating NOx nitrogen oxides and a urea injector. .
  • a catalyst of the selective catalytic reduction type known by the name SCR (for "Selective Catalytical Reducer”). It is known to inject an aqueous urea-based solution upstream of the catalyst, the urea being converted into ammonia NH 3 and carbon dioxide under the action of the heat of the exhaust gas. Ammonia reacts with nitrogen oxides NOx to form N2 nitrogen and water. The reaction is as follows: 4 NO + 4 NH 3 + O 2 ⁇ 4 N 2 + 6H 2 O
  • the aqueous ammonia solution is marketed for example under the trademark AdBlue.
  • the injection of urea into the muffler is generally carried out using an injector disposed in the exhaust line upstream of the catalyst.
  • This injector sprays the urea solution in the form of droplets, with a diameter of around 100 ⁇ m.
  • a mixer consisting mainly of immobile blades.
  • the mixer is an independent element that must be inserted and put in place in the exhaust line. This mixer adds weight to the vehicle and time to build the exhaust system.
  • Another problem is that for certain types of exhaust systems, the The mixer must be integrated in a straight part of the line, approximately at least 20 to 30 mm, which can pose problems of integration.
  • the exhaust line is cluttered by these different elements that must all fit the length of the line.
  • the present invention provides a decoupling element that overcomes these disadvantages, including reducing the size, weight and installation time of the exhaust line.
  • the present invention proposes a vibratory decoupling element intended to be placed in the line of the exhaust gases of a heat engine, said line comprising a urea injector for spraying urea and means for catalysis for the treatment of NOx nitrogen oxides.
  • a vibratory decoupling element intended to be placed in the line of the exhaust gases of a heat engine, said line comprising a urea injector for spraying urea and means for catalysis for the treatment of NOx nitrogen oxides.
  • one of the two ends of said element (preferably the inlet through which the exhaust gas enters) comprises a mixer for mixing the urea sprayed with the exhaust gas, said mixer being integrated at said end.
  • said element comprises a watertight piece comprising a central portion of undulated shape and two ends one of which forms said input of said element, said mixer being made in said input.
  • the thickness of said sealing part consists of two different materials, the thickness of each material being between 0.15 and 0.3 mm.
  • said element comprises an outer envelope surrounding at least said central part of said part, said envelope allowing to damp, at least in part, the vibration modes of said part.
  • Said envelope may be made of a braided material which may be metallic.
  • Said vibratory decoupling element may comprise thermal insulation means making it possible to avoid, at least in part, a loss of heat of the exhaust gases.
  • These means may comprise a flexible metal conduit surrounded by at least said central portion of said sealed piece.
  • Said duct may be made of a stapled material.
  • the exhaust gas line 10 of a motor 11 comprises a first portion 12 secured to the motor 11 and a second portion 13 integral with the vehicle frame.
  • a hose 14 is interposed between said first and second parts 12 and 14 so as to avoid the transmission of engine vibrations to the second portion 13.
  • the latter comprises catalytic means 15 for treating NOx nitrogen oxides.
  • These means may consist of a catalyst of the selective catalytic reduction type, known by the name SCR (for "Selective Catalytical Reducer").
  • This catalyst is generally composed of one (or more) ceramic cylinder (s) comprising a multitude of parallel channels whose walls are coated with the catalytic substance.
  • An injector 16 placed upstream of the catalyst 15 injects an aqueous solution based on urea into the exhaust line.
  • Urea is sprayed as droplets, which are broken up and mixed with Exhaust gas passing through a mixer 17.
  • this mixer is an integral part of one of the two ends 18 and 19 of the hose 14, preferably the inlet 18 of the hose closest to the 'injector.
  • the flexible assembly 14+ integrated mixer 17 forming a vibrating decoupling element 20 according to the present invention.
  • the inlet 18 or the outlet 19 is the end of the vibratory decoupling element through which the exhaust gas enters or exits respectively.
  • the embodiment of the vibrating decoupling element 20, one end of which is shown in section on the figures 3 and 4 comprises a sealed and advantageously flexible piece 21, thermal insulation means 22, an outer casing 23 and a ring 24.
  • the sealing piece 21, the insulating means 22, the casing 23 and the ring 24 are arranged coaxially around the longitudinal axis 25 ( figure 4 ) of the vibration decoupling element 20.
  • the thermal insulation means 22 are not mandatory but they can advantageously be present to prevent heat loss of the exhaust gas. These means, unsealed, may be constituted by a "stapled", that is to say a flexible metal conduit similar to a shower hose. The staple 22 is placed inside the sealed part 21 and coaxially with this part. Staple 22 is also shown on the figure 8 .
  • the outer casing 23 may be formed by a metal braid which damps the vibratory modes of the sealing part 21. It can also protect the vibratory decoupling element against projections of gravel. This metallic braid is also represented on the figure 7 .
  • the thermal insulation means 22, the watertight piece 21 and the outer shell 23 are held at their ends by a ring 24 or 29 (also represented on the figure 9 ).
  • the sealed piece 21 has a central portion 26 ( figure 2 ) which has the shape of a bellows or "wavy" and two ends 27 and 28 of cylindrical shape.
  • a mixer 17 is integrated at one of the ends 27 and 28, preferably at the end closest to the injector 16 and therefore at the input of the vibratory decoupling element and this mixer is formed from and in this end.
  • the Figures 5 and 6 represent, respectively in section and in three dimensions, the end 18 of the vibratory decoupling element comprising the mixer 17.
  • This end 18 is composed of the end of the central part 26 of the sealing part 21, of the cylindrical part 28 of the sealing member 21, the ring 29 and the mixer 17.
  • the latter comprises blades 30 which allow to burst and mix the droplets of urea with the exhaust gas.
  • the mixer therefore consists of an outer ring 31 and concentric blades 30 non-moving.
  • the latter may have different inclinations to promote the transformation of urea into ammonia.
  • the present invention allows a saving in mass thanks to the reduced thickness of the mixer 17, as well as a saving in space and time of assembly compared to the usual architecture where the mixer is a separate element of the hose.

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

Abstract

The element has an inlet (18) with which a mixer (17) is integrated, and a flexible sealing part (21) whose thickness comprises two different materials, where the mixer mixes sprayed urea with exhaust gas. The sealing part has a corrugated central portion that is enclosed by an outer envelope, where the envelope is made of metallic braid material. The envelope partially dampens vibration modes of the sealing part. A thermal insulation unit comprises a metallic flexible pipe that is enclosed by the central portion and is made of fastened material. An independent claim is also included for a method for fabricating a vibration decoupling element.

Description

La présente invention concerne un élément de découplage vibratoire destiné à être placé dans la ligne des gaz d'échappement d'un moteur thermique, lorsque cette ligne est équipée d'un catalyseur pour traiter les oxydes d'azote NOx et un injecteur d'urée.The present invention relates to a vibratory decoupling element intended to be placed in the line of the exhaust gases of a heat engine, when this line is equipped with a catalyst for treating NOx nitrogen oxides and a urea injector. .

Afin de diminuer les émissions polluantes des moteurs thermiques, et notamment les émissions d'oxydes d'azotes, on peut utiliser un catalyseur du type réduction catalytique sélective, connu sous de nom SCR (pour "Selective Catalytical Reducer"). II est connu d'injecter une solution aqueuse à base d'urée en amont du catalyseur, l'urée se transformant en ammoniac NH3 et en gaz carbonique sous l'action de la chaleur des gaz d'échappement. L'ammoniac réagit avec les oxydes d'azote NOx pour former de l'azote N2 et de l'eau. La réaction est la suivante:

         4 NO + 4 NH3 + O2 → 4 N2+ 6H2O

In order to reduce the pollutant emissions of heat engines, and in particular the emissions of nitrogen oxides, it is possible to use a catalyst of the selective catalytic reduction type, known by the name SCR (for "Selective Catalytical Reducer"). It is known to inject an aqueous urea-based solution upstream of the catalyst, the urea being converted into ammonia NH 3 and carbon dioxide under the action of the heat of the exhaust gas. Ammonia reacts with nitrogen oxides NOx to form N2 nitrogen and water. The reaction is as follows:

4 NO + 4 NH 3 + O 2 → 4 N 2 + 6H 2 O

La solution aqueuse à base d'ammoniac est commercialisée par exemple sous la marque AdBlue.The aqueous ammonia solution is marketed for example under the trademark AdBlue.

L'injection d'urée dans le pot d'échappement est généralement effectuée à l'aide d'un injecteur disposé dans la ligne d'échappement en amont du catalyseur. Cet injecteur pulvérise la solution d'urée sous forme de gouttelettes, de diamètre voisin de 100 µm. Afin de fragmenter ces gouttelettes et de bien les mélanger avec les gaz d'échappement, on dispose en aval de l'injecteur un mixeur principalement constitué par des pales immobiles. Le mixeur est un élément indépendant que l'on doit insérer et mettre en place dans la ligne d'échappement. Ce mixeur ajoute du poids au véhicule et du temps pour fabriquer la ligne d'échappement. Un autre problème vient du fait que, pour certains type de ligne d'échappement, le mixeur doit être intégré dans une partie droite de la ligne, d'environ au moins 20 à 30 mm, ce qui peut poser des problèmes d'intégration.The injection of urea into the muffler is generally carried out using an injector disposed in the exhaust line upstream of the catalyst. This injector sprays the urea solution in the form of droplets, with a diameter of around 100 μm. In order to fragment these droplets and to mix them well with the exhaust gases, downstream of the injector is a mixer consisting mainly of immobile blades. The mixer is an independent element that must be inserted and put in place in the exhaust line. This mixer adds weight to the vehicle and time to build the exhaust system. Another problem is that for certain types of exhaust systems, the The mixer must be integrated in a straight part of the line, approximately at least 20 to 30 mm, which can pose problems of integration.

D'autre part, il est connu de relier à l'aide d'un flexible la partie de la ligne d'échappement fixée au moteur avec la partie fixée au véhicule. Le flexible a pour but de découpler ou filtrer les vibrations de la partie fixée au moteur afin qu'elles ne se propagent pas dans la partie de la ligne d'échappement fixée au véhicule.On the other hand, it is known to connect with a flexible part of the exhaust line attached to the engine with the part attached to the vehicle. The purpose of the hose is to decouple or filter the vibrations of the part attached to the engine so that they do not propagate in the part of the exhaust line attached to the vehicle.

La ligne d'échappement est donc encombrée par ces différents éléments qui doivent tous tenir sur la longueur de la ligne.The exhaust line is cluttered by these different elements that must all fit the length of the line.

La présente invention propose un élément de découplage qui permet de pallier ces inconvénients, notamment en réduisant l'encombrement, le poids et le temps de montage de la ligne d'échappement.The present invention provides a decoupling element that overcomes these disadvantages, including reducing the size, weight and installation time of the exhaust line.

A titre d'exemples d'architecture de ligne d'échappement avec catalyseur SCR, on peut citer le brevet EP 0 558 452 B2 et le brevet CN 201179429Y . Cependant ces architectures n'utilisent pas un élément de découplage semblable à celui décrit et revendiqué ci-après et ne proposent pas de s'affranchir desdits inconvénients.As examples of exhaust system architecture with SCR catalyst, mention may be made of the patent EP 0 558 452 B2 and the patent CN 201179429Y . However, these architectures do not use a decoupling element similar to that described and claimed hereinafter and do not offer to overcome these disadvantages.

De façon plus précise, la présente invention propose un élément de découplage vibratoire destiné à être placé dans la ligne des gaz d'échappement d'un moteur thermique, ladite ligne comportant un injecteur d'urée permettant de pulvériser l'urée et des moyens de catalyse pour le traitement des oxydes d'azote NOx. Selon l'invention, l'une des deux extrémités dudit élément (de préférence l'entrée par laquelle pénètrent les gaz d'échappement) comporte un mixeur pour le mélange de l'urée pulvérisée avec les gaz d'échappement, ledit mixeur étant intégré à ladite extrémité.More specifically, the present invention proposes a vibratory decoupling element intended to be placed in the line of the exhaust gases of a heat engine, said line comprising a urea injector for spraying urea and means for catalysis for the treatment of NOx nitrogen oxides. According to the invention, one of the two ends of said element (preferably the inlet through which the exhaust gas enters) comprises a mixer for mixing the urea sprayed with the exhaust gas, said mixer being integrated at said end.

Selon un mode de réalisation, ledit élément comporte une pièce étanche comprenant une partie centrale de forme ondulée et deux extrémités dont l'une forme ladite entrée dudit élément, ledit mixeur étant réalisé dans ladite entrée.According to one embodiment, said element comprises a watertight piece comprising a central portion of undulated shape and two ends one of which forms said input of said element, said mixer being made in said input.

De préférence, l'épaisseur de ladite pièce étanche est constituée de deux matériaux différents, l'épaisseur de chaque matériau pouvant être comprise entre 0,15 et 0,3 mm.Preferably, the thickness of said sealing part consists of two different materials, the thickness of each material being between 0.15 and 0.3 mm.

Avantageusement, ledit élément comporte une enveloppe extérieure entourant au moins ladite partie centrale de ladite pièce, ladite enveloppe permettant d'amortir, au moins en partie, les modes de vibration de ladite pièce. Ladite enveloppe peut être réalisée en un matériau tressé qui peut être métallique.Advantageously, said element comprises an outer envelope surrounding at least said central part of said part, said envelope allowing to damp, at least in part, the vibration modes of said part. Said envelope may be made of a braided material which may be metallic.

Ledit élément de découplage vibratoire peut comporter des moyens d'isolation thermique permettant d'éviter, au moins en partie, une déperdition de chaleur des gaz d'échappement. Ces moyens peuvent comprendre un conduit flexible métallique entouré par au moins ladite partie centrale de ladite pièce étanche. Ledit conduit peut être réalisé en un matériau agrafé.Said vibratory decoupling element may comprise thermal insulation means making it possible to avoid, at least in part, a loss of heat of the exhaust gases. These means may comprise a flexible metal conduit surrounded by at least said central portion of said sealed piece. Said duct may be made of a stapled material.

L'invention concerne également un procédé de fabrication de l'élément de découplage défini précédemment. Selon ledit procédé :

  • ladite pièce étanche est réalisée à partir d'un cylindre métallique;
  • la partie centrale dudit cylindre est plissée pour former un onduleux, et
  • l'une des deux extrémités dudit cylindre est emboutie pour réaliser des pales qui forment ledit mixeur.
Ladite extrémité emboutie du cylindre peut être découpée pour réaliser lesdites pales avec une forme souhaitée. Lesdites pales peuvent être rigidifiées en les soudant entre elles à l'aide d'une bague.
Ladite partie centrale du cylindre peut avantageusement être plissée par hydroformage.The invention also relates to a method of manufacturing the decoupling element defined above. According to said method:
  • said sealing member is made from a metal cylinder;
  • the central portion of said cylinder is folded to form a wavy, and
  • one of the two ends of said cylinder is stamped to make blades that form said mixer.
Said stamped end of the cylinder can be cut to achieve said blades with a desired shape. Said blades can be stiffened by welding them together with a ring.
Said central portion of the cylinder may advantageously be folded by hydroforming.

D'autres avantages et caractéristiques de l'invention apparaîtront au cours de la description qui suit d'un mode de réalisation de l'invention, donné à titre d'exemple non limitatif, en référence aux dessins annexés et sur lesquels :

  • la figure 1 montre l'architecture d'une ligne d'échappement munie de l'élément de découplage vibratoire selon l'invention,
  • les figures 2, 7, 8 et 9 représentent divers composants de l'élément de découplage vibratoire,
  • les figures 3 et 4 représentent en coupe longitudinale une extrémité dudit élément non munie du mixeur, et
  • les figures 5 et 6 montrent l'entrée de l'élément vibratoire qui, selon l'invention, comporte un mixeur intégré.
Other advantages and features of the invention will become apparent from the following description of an embodiment of the invention, given by way of non-limiting example, with reference to the accompanying drawings and in which:
  • the figure 1 shows the architecture of an exhaust line provided with the vibratory decoupling element according to the invention,
  • the figures 2 , 7, 8 and 9 represent various components of the vibratory decoupling element,
  • the figures 3 and 4 represent in longitudinal section an end of said element not provided with the mixer, and
  • the Figures 5 and 6 show the input of the vibratory element which, according to the invention, comprises an integrated mixer.

Les dessins annexés pourront non seulement servir à compléter l'invention, mais aussi contribuer à sa définition, le cas échéant.The attached drawings may not only serve to complete the invention, but also contribute to its definition, if any.

Sur la figure 1, la ligne 10 d'échappement des gaz brûlés d'un moteur 11 comporte une première partie 12 solidaire du moteur 11 et une deuxième partie 13 solidaire du châssis du véhicule. Un flexible 14 est intercalé entre lesdites première et deuxième parties 12 et 14 de façon à éviter la transmission des vibrations du moteur à la deuxième partie 13. Cette dernière comporte des moyens de catalyse 15 permettant de traiter les oxydes d'azote NOx. Ces moyens peuvent être constitués d'un catalyseur du type réduction catalytique sélective, connu sous de nom SCR (pour "Selective Catalytical Reducer"). Ce catalyseur est généralement composé d'un (ou plusieurs) cylindre(s) de céramique comportant une multitude de canaux parallèles dont les parois sont revêtues de la substance catalytique. Un injecteur 16 placé en amont du catalyseur 15 injecte une solution aqueuse à base d'urée dans la ligne d'échappement. L'urée est pulvérisée sous forme de gouttelettes, lesquelles sont fragmentées et mélangées aux gaz d'échappement en passant à travers un mixeur 17. Selon l'invention, ce mixeur est une partie intégrante de l'une des deux extrémités 18 et 19 du flexible 14, de préférence de l'entrée 18 du flexible plus proche de l'injecteur. L'ensemble flexible 14+ mixeur intégré 17 formant un élément de découplage vibratoire 20 conforme à la présente invention. L'entrée 18 ou la sortie19 est l'extrémité de l'élément de découplage vibratoire par laquelle respectivement pénètrent ou sortent les gaz d'échappement.On the figure 1 , the exhaust gas line 10 of a motor 11 comprises a first portion 12 secured to the motor 11 and a second portion 13 integral with the vehicle frame. A hose 14 is interposed between said first and second parts 12 and 14 so as to avoid the transmission of engine vibrations to the second portion 13. The latter comprises catalytic means 15 for treating NOx nitrogen oxides. These means may consist of a catalyst of the selective catalytic reduction type, known by the name SCR (for "Selective Catalytical Reducer"). This catalyst is generally composed of one (or more) ceramic cylinder (s) comprising a multitude of parallel channels whose walls are coated with the catalytic substance. An injector 16 placed upstream of the catalyst 15 injects an aqueous solution based on urea into the exhaust line. Urea is sprayed as droplets, which are broken up and mixed with Exhaust gas passing through a mixer 17. According to the invention, this mixer is an integral part of one of the two ends 18 and 19 of the hose 14, preferably the inlet 18 of the hose closest to the 'injector. The flexible assembly 14+ integrated mixer 17 forming a vibrating decoupling element 20 according to the present invention. The inlet 18 or the outlet 19 is the end of the vibratory decoupling element through which the exhaust gas enters or exits respectively.

Le mode de réalisation de l'élément de découplage vibratoire 20, dont une extrémité est représentée en coupe sur les figures 3 et 4, comporte une pièce étanche et avantageusement souple 21, des moyens d'isolation thermique 22, une enveloppe extérieure 23 et une bague 24. La pièce étanche 21, les moyens d'isolation 22, l'enveloppe 23 et la bague 24 sont disposés coaxialement autour de l'axe longitudinal 25 (figure 4) de l'élément de découplage vibratoire 20.The embodiment of the vibrating decoupling element 20, one end of which is shown in section on the figures 3 and 4 , comprises a sealed and advantageously flexible piece 21, thermal insulation means 22, an outer casing 23 and a ring 24. The sealing piece 21, the insulating means 22, the casing 23 and the ring 24 are arranged coaxially around the longitudinal axis 25 ( figure 4 ) of the vibration decoupling element 20.

Les moyens d'isolation thermique 22 ne sont pas obligatoires mais ils peuvent avantageusement être présents afin d'éviter une déperdition de chaleur des gaz d'échappement. Ces moyens, non étanches, peuvent être constitués par un "agrafé", c'est-à-dire d'un conduit flexible métallique semblable à un tuyau flexible de douche. L'agrafé 22 est placé à l'intérieur de la pièce étanche 21 et coaxialement à cette pièce. L'agrafé 22 est également représenté sur la figure 8.The thermal insulation means 22 are not mandatory but they can advantageously be present to prevent heat loss of the exhaust gas. These means, unsealed, may be constituted by a "stapled", that is to say a flexible metal conduit similar to a shower hose. The staple 22 is placed inside the sealed part 21 and coaxially with this part. Staple 22 is also shown on the figure 8 .

L'enveloppe extérieure 23 peut être formée par une tresse métallique qui amortie les modes vibratoires de la pièce étanche 21. Elle peut aussi protéger l'élément de découplage vibratoire contre les projections de graviers. Cette tresse métallique est également représentée sur la figure 7.The outer casing 23 may be formed by a metal braid which damps the vibratory modes of the sealing part 21. It can also protect the vibratory decoupling element against projections of gravel. This metallic braid is also represented on the figure 7 .

Comme illustré sur les figures 3 et 4, les moyens d'isolation thermique 22, la pièce étanche 21 et l'enveloppe extérieure 23 sont maintenus à leurs extrémités par une bague 24 ou 29 (également représentées sur la figure 9).As illustrated on figures 3 and 4 , the thermal insulation means 22, the watertight piece 21 and the outer shell 23 are held at their ends by a ring 24 or 29 (also represented on the figure 9 ).

La pièce étanche 21 comporte une partie centrale 26 (figure 2) qui a la forme d'un soufflet ou "onduleux" et deux extrémités 27 et 28 de forme cylindrique. Selon l'invention, un mixeur 17 est intégré à l'une des extrémités 27 et 28, de préférence à l'extrémité la plus proche de l'injecteur 16 et donc à l'entrée de l'élément de découplage vibratoire et ce mixeur est formé à partir de et dans cette extrémité.The sealed piece 21 has a central portion 26 ( figure 2 ) which has the shape of a bellows or "wavy" and two ends 27 and 28 of cylindrical shape. According to the invention, a mixer 17 is integrated at one of the ends 27 and 28, preferably at the end closest to the injector 16 and therefore at the input of the vibratory decoupling element and this mixer is formed from and in this end.

Les figures 5 et 6 représentent, respectivement en coupe et en trois dimensions, l'extrémité 18 de l'élément de découplage vibratoire comportant le mixeur 17. Cette extrémité 18 se compose de l'extrémité de la partie centrale 26 de la pièce étanche 21, de la partie cylindrique 28 de la pièce étanche 21, de la bague 29 et du mixeur 17. Ce dernier comporte des pales 30 qui permettent d'éclater et de mélanger les gouttelettes d'urée avec les gaz d'échappement.The Figures 5 and 6 represent, respectively in section and in three dimensions, the end 18 of the vibratory decoupling element comprising the mixer 17. This end 18 is composed of the end of the central part 26 of the sealing part 21, of the cylindrical part 28 of the sealing member 21, the ring 29 and the mixer 17. The latter comprises blades 30 which allow to burst and mix the droplets of urea with the exhaust gas.

Les pales sont intégrées directement dans l'extrémité de l'onduleux. Elles sont fabriquées à partir de l'extrémité cylindrique de l'onduleux. Les étapes de fabrication sont les suivantes:

  • l'onduleux est tout d'abord obtenu par hydroformage d'un tube cylindrique composé de préférence de deux épaisseurs de matériaux différents, chaque épaisseur étant comprise entre 0,15 et 0,3 mm, de préférence égale à 0,2 mm, soit une épaisseur totale comprise entre 0,3 et 0,6 mm et de préférence égale à 0,4 mm. La forme ondulée ne concerne que la partie centrale 26, les extrémités 27 et 28 restant droites et cylindriques. L'hydroformage de l'onduleux est effectué tout en laissant suffisamment de longueur droite à une extrémité afin de permettre le formage des pales.
  • les pales sont ensuite formées par emboutissage et découpage de la longueur droite à l'extrémité de l'onduleux. Pour ce faire, un mandrin femelle muni de mâchoires enserre l'extrémité cylindrique extérieure de l'onduleux et, en tournant, vient appuyer contre un mandrin male de forme et de découpe situé au centre de l'onduleux. L'extrémité cylindrique doit être suffisamment longue pour la formation des pales. La découpe permet de donner aux pales la forme souhaitée.
  • Afin de rendre les pales solidaires et rigides, elles ont soudées entre elles par le biais d'une bague 31 (figure 6). Rigidifier les pales est nécessaire étant donné la faible épaisseur (par exemple 2x0,2 mm) du matériau formant l'onduleux, afin d'éviter leur déformation par le passage des gaz d'échappement.
  • Finalement, les deux bagues 24 et 29, le conduit flexible 22, l'onduleux 21 et l'enveloppe extérieure sont assemblés pour former l'élément de découplage vibratoire 20.
The blades are integrated directly into the end of the wavy. They are made from the cylindrical end of the wavy. The manufacturing steps are as follows:
  • the wavy is first obtained by hydroforming a cylindrical tube preferably composed of two thicknesses of different materials, each thickness being between 0.15 and 0.3 mm, preferably equal to 0.2 mm, or a total thickness of between 0.3 and 0.6 mm and preferably equal to 0.4 mm. The corrugated shape only concerns the central portion 26, the ends 27 and 28 remaining straight and cylindrical. Hydroforming of the wavy is done while leaving enough straight length at one end to allow blade forming.
  • the blades are then formed by stamping and cutting the straight length at the end of the wavy. To do this, a mandrel female provided with jaws encloses the outer cylindrical end of the wavy and, turning, comes to rest against a male mandrel shaped and cut in the center of the wavy. The cylindrical end should be long enough for blade formation. Cutting gives the blades the desired shape.
  • In order to make the blades integral and rigid, they have welded together by means of a ring 31 ( figure 6 ). Rigidifying the blades is necessary because of the small thickness (for example 2x0.2 mm) of the material forming the corrugated, to prevent their deformation by the passage of the exhaust gas.
  • Finally, the two rings 24 and 29, the flexible duct 22, the corrugated 21 and the outer casing are assembled to form the vibratory decoupling element 20.

Le mixeur est donc constitué d'une bague extérieure 31 et de pales concentriques 30 non mobiles. Ces dernières peuvent avoir des inclinaisons différentes afin de favoriser la transformation de l'urée en ammoniac.The mixer therefore consists of an outer ring 31 and concentric blades 30 non-moving. The latter may have different inclinations to promote the transformation of urea into ammonia.

La présente invention permet un gain de masse grâce à l'épaisseur réduite du mixeur 17, ainsi qu'un gain en encombrement et en temps de montage par rapport à l'architecture habituelle où le mixeur est un élément séparé du flexible.The present invention allows a saving in mass thanks to the reduced thickness of the mixer 17, as well as a saving in space and time of assembly compared to the usual architecture where the mixer is a separate element of the hose.

D'autres modes de réalisation que celui décrit et représenté peut être conçu par l'homme du métier sans sortir du cadre de la présente invention.Embodiments other than that described and shown may be devised by those skilled in the art without departing from the scope of the present invention.

Claims (15)

Elément de découplage vibratoire (20) destiné à être placé dans la ligne (10) des gaz d'échappement d'un moteur thermique (11), ladite ligne comportant un injecteur d'urée (16) permettant de pulvériser l'urée et des moyens de catalyse (15) pour le traitement des oxydes d'azote NOx, ledit élément étant caractérisé en ce qu'il comporte un mixeur (17) pour le mélange de l'urée pulvérisée avec les gaz d'échappement, ledit mixeur étant intégré à l'une (18) des deux extrémités dudit élément (20).Vibration decoupling element (20) for placing in the line (10) of the exhaust gas of a heat engine (11), said line comprising a urea injector (16) for spraying urea and catalyzing means (15) for the treatment of nitrogen oxides NOx, said element being characterized in that it comprises a mixer (17) for mixing the pulverized urea with the exhaust gases, said mixer being integrated at one (18) of the two ends of said element (20). Elément selon la revendication 1 caractérisé en ce que ledit mixeur est intégré à l'entrée (18) dudit élément.Element according to claim 1 characterized in that said mixer is integrated in the input (18) of said element. Elément selon la revendication 1 ou la revendication 2, caractérisé en ce qu'il comporte une pièce étanche (21) comprenant une partie centrale de forme ondulée (26) et deux extrémités (27, 28) dont l'une forme ladite entrée dudit élément, ledit mixeur étant réalisé dans ladite entrée.Element according to claim 1 or claim 2, characterized in that it comprises a sealing member (21) comprising a corrugated central portion (26) and two ends (27, 28), one of which forms said input of said element said mixer being made in said input. Elément selon la revendication 3, caractérisé en ce que l'épaisseur de ladite pièce étanche (21) est constituée de deux matériaux différents.Element according to claim 3, characterized in that the thickness of said sealing part (21) consists of two different materials. Elément selon la revendication 4, caractérisé en ce que l'épaisseur de chacun desdits matériaux est comprise entre 0,15 et 0,3 mm.Element according to claim 4, characterized in that the thickness of each of said materials is between 0.15 and 0.3 mm. Elément selon l'une des revendications 3 à 5, caractérisé en ce qu'il comporte une enveloppe extérieure (23) entourant au moins ladite partie centrale (26) de ladite pièce, ladite enveloppe permettant d'amortir, au moins en partie, les modes de vibration de ladite pièce.Element according to one of claims 3 to 5, characterized in that it comprises an outer casing (23) surrounding at least said central portion (26) of said part, said casing allowing to damp, at least in part, the modes of vibration of said piece. Elément selon la revendication 6, caractérisé en ce que ladite enveloppe extérieure (23) est réalisée en un matériau tressé.Element according to claim 6, characterized in that said outer casing (23) is made of a braided material. Elément selon la revendication 7, caractérisé en ce que ledit matériau tressé est métallique.Element according to claim 7, characterized in that said braided material is metallic. Elément selon l'une des revendications précédentes caractérisé en ce qu'il comporte des moyens d'isolation thermique (22) permettant d'éviter, au moins en partie, une déperdition de chaleur des gaz d'échappement.Element according to one of the preceding claims characterized in that it comprises thermal insulation means (22) to avoid, at least in part, a loss of heat of the exhaust gas. Elément selon la revendication 9 et l'une des revendications 3 à 8, caractérisé en ce que lesdits moyens (22) comportent un conduit flexible métallique entouré par au moins ladite partie centrale de ladite pièce étanche.Element according to claim 9 and one of claims 3 to 8, characterized in that said means (22) comprise a flexible metal conduit surrounded by at least said central portion of said sealing member. Elément selon la revendication 10, caractérisé en ce que ledit conduit (22) est réalisé en un matériau agrafé.Element according to claim 10, characterized in that said conduit (22) is made of a stapled material. Procédé de fabrication de l'élément défini par l'une des revendications précédentes 2 à 11 caractérisé en ce que: • ladite pièce étanche (21) est réalisée à partir d'un cylindre métallique; • la partie centrale (26) dudit cylindre est plissée pour former un onduleux, et • l'une des deux extrémités (27, 28) dudit cylindre est emboutie pour réaliser des pales (30) qui forment ledit mixeur (17). Method of manufacturing the element defined by one of the preceding claims 2 to 11 characterized in that : Said sealed piece (21) is made from a metal cylinder; The central portion (26) of said cylinder is folded to form a wavy, and • one of the two ends (27, 28) of said cylinder is stamped to make blades (30) which form said mixer (17). Procédé selon la revendication 12, caractérisé en ce que ladite extrémité du cylindre emboutie est découpée pour réaliser lesdites pales (30) avec une forme souhaitée.The method of claim 12, characterized in that said end of the stamped cylinder is cut to realize said blades (30) with a desired shape. Procédé selon la revendication 12 ou la revendication 13, caractérisé en ce que lesdites pales sont soudées entre elles à l'aide d'une bague (31).A method according to claim 12 or claim 13, characterized in that said blades are welded together by means of a ring (31). Procédé selon l'une des revendications 12 à 14, caractérisé en ce que ladite partie centrale (26) du cylindre est plissée par hydroformage.Method according to one of claims 12 to 14, characterized in that said central portion (26) of the cylinder is folded by hydroforming.
EP11194056A 2011-01-07 2011-12-16 Vibration decoupling element for an exhaust line with an integrated mixer and manufacturing procedure of said element Withdrawn EP2474720A1 (en)

Applications Claiming Priority (1)

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FR1150139A FR2970296B1 (en) 2011-01-07 2011-01-07 VIBRATION DECOUPLING ELEMENT FOR EXHAUST LINE WITH INTEGRATED MIXER AND METHOD FOR MANUFACTURING THE SAME

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013213484A1 (en) * 2013-07-10 2015-01-15 Witzenmann Gmbh Flexible conduit element
US8999276B1 (en) 2013-09-19 2015-04-07 Caterpillar Inc. System and method for mixing of fluids
DE102016111549A1 (en) * 2016-06-23 2017-12-28 Witzenmann Gmbh Conduit element for an exhaust pipe

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Publication number Priority date Publication date Assignee Title
EP0558452B1 (en) 1992-02-24 1995-05-03 Hans Thomas Hug Purification of combustion gases
CN201179429Y (en) 2008-02-01 2009-01-14 曾永健 Alkaline air, air mixer
US20090084094A1 (en) * 2007-10-02 2009-04-02 Goss James R Exhaust Aftertreatment System with Compliantly Coupled Sections

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0558452B1 (en) 1992-02-24 1995-05-03 Hans Thomas Hug Purification of combustion gases
US20090084094A1 (en) * 2007-10-02 2009-04-02 Goss James R Exhaust Aftertreatment System with Compliantly Coupled Sections
CN201179429Y (en) 2008-02-01 2009-01-14 曾永健 Alkaline air, air mixer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013213484A1 (en) * 2013-07-10 2015-01-15 Witzenmann Gmbh Flexible conduit element
US8999276B1 (en) 2013-09-19 2015-04-07 Caterpillar Inc. System and method for mixing of fluids
CN104514600A (en) * 2013-09-19 2015-04-15 卡特彼勒公司 System and method for mixing of fluids
CN104514600B (en) * 2013-09-19 2018-09-18 卡特彼勒公司 After-treatment system shell and method for fluid-mixing
DE102016111549A1 (en) * 2016-06-23 2017-12-28 Witzenmann Gmbh Conduit element for an exhaust pipe

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