EP2400140B1 - Heat exchanger for gas, in particular for the exhaust gas of an engine - Google Patents

Heat exchanger for gas, in particular for the exhaust gas of an engine Download PDF

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Publication number
EP2400140B1
EP2400140B1 EP11170763.4A EP11170763A EP2400140B1 EP 2400140 B1 EP2400140 B1 EP 2400140B1 EP 11170763 A EP11170763 A EP 11170763A EP 2400140 B1 EP2400140 B1 EP 2400140B1
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EP
European Patent Office
Prior art keywords
exchanger
gas reservoir
gas
housing
component forming
Prior art date
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EP11170763.4A
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German (de)
French (fr)
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EP2400140A2 (en
EP2400140A3 (en
Inventor
Eva Tomas Herrero
José Antonio De La Fuente Romero
Jorge Ibarz Castello
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Valeo Termico SA
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Valeo Termico SA
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32Liquid-cooled heat exchangers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/11Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/36Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for adding fluids other than exhaust gas to the recirculation passage; with reformers

Definitions

  • the present invention relates to a heat exchanger for gas, in particular for the exhaust gases of an engine.
  • the invention finds particular application in exhaust gas recirculation exchangers (EGRC) of an engine (hereinafter still referred to as EGR exchanger).
  • EGRC exhaust gas recirculation exchangers
  • the current configuration of the EGR exchangers on the market corresponds to that of a metal heat exchanger generally made of stainless steel or aluminum, see for example, the DE 10028131 C1 .
  • a metal heat exchanger generally made of stainless steel or aluminum, see for example, the DE 10028131 C1 .
  • EGR exchangers The majority of the components of both types of EGR exchangers are metallic, so the exchangers are assembled by mechanical means and then oven-welded or arc or laser-welded to provide an adequate level of sealing for the application. considered.
  • the EGR exchanger can also include components made of plastic that can perform one or more functions as a single piece.
  • the heat exchanger integrates different components giving it these functions. This means that an EGR exchanger must have at least two connections to the cooling fluid, at least two gas connections and at least one element or bracket to the engine environment.
  • the subject of the present invention is a gas heat exchanger, in particular for the exhaust gases of an engine, making it possible to overcome the drawbacks of heat exchangers known in the art, capable of integrating various functions in the form of a single piece of gas. coupling coupled to the heat exchanger housing.
  • the gas heat exchanger in particular for the exhaust gas of an engine, which is the subject of the present invention, comprises a housing intended for the circulation of gases with heat exchange with a cooling fluid, means for connecting to the circuit of the cooling fluid and at least one piece forming a gas reservoir coupled to one end of the housing, said part integrating at least one fixing lug to the engine block and connecting means to the gas circuit, and is characterized in that said connecting means to the coolant circuit are also integrated with said gas reservoir part.
  • the gas reservoir part is manufactured in several parts if the demolding process is not feasible or if it proves to be too complex, said parts being welded together and to the housing of the exchanger to ensure the sealing of coolant and gases.
  • the gas reservoir piece may be made of stainless steel or aluminum.
  • Aluminum fabrication has the advantage of reducing the cost of the part and slightly improving the efficiency of the EGR exchanger due to the better conductivity of aluminum compared to that of stainless steel.
  • the gas reservoir part may have orifices enabling it to be fastened to the heat exchanger box by means of bolting elements.
  • the path of the cooling fluid passes through the bracket and a bridge integrated in said gas reservoir part and connected to the housing of the exchanger.
  • the gas reservoir member has a flange or flange connectable to a gas circuit interface.
  • the gas reservoir part comprises threaded orifices for setting up a thermostat for the cooling fluid.
  • the gas reservoir part comprises an orifice for evacuation of the exchanger of the trapped gases in the cooling fluid circuit.
  • the heat exchanger 1 for gas in particular for the exhaust gas of an engine, comprises a housing 2 intended for the circulation of gases with heat exchange with a cooling fluid.
  • Said gas reservoir part 7 can be entirely manufactured by means of a process of microfusion and welding to the housing 2 of the exchanger 1; or be made in several parts if the demolding process is not feasible or if it proves too complex, said parts then being welded together and to the housing 2 of the exchanger 1 to ensure the fluid tightness cooling and gases.
  • Said gas reservoir piece 7 can be fixed to the casing 2 of the exchanger 1 by means of a method of welding in the oven or welding arc or laser; or be attached to the housing 2 by means of bolts.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Description

La présente invention concerne un échangeur de chaleur pour gaz, notamment pour les gaz d'échappement d'un moteur.The present invention relates to a heat exchanger for gas, in particular for the exhaust gases of an engine.

L'invention trouve une application particulière dans les échangeurs de recirculation de gaz d'échappement (EGRC) d'un moteur (ci-après encore dénommés échangeur EGR) .The invention finds particular application in exhaust gas recirculation exchangers (EGRC) of an engine (hereinafter still referred to as EGR exchanger).

ARRIÈRE-PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION

La configuration actuelle des échangeurs EGR sur le marché correspond à celle d'un échangeur de chaleur métallique généralement fabriqué en acier inoxydable ou en aluminium, voir par example, le DE 10028131 C1 . Il existe essentiellement deux types d'échangeurs de chaleur EGR : un premier type consiste en un boîtier à l'intérieur de laquelle est placé un faisceau de tubes pour le passage des gaz, le fluide de refroidissement circulant par le boitier à l'extérieur des tubes ; et le second type compte une série de plaques parallèles constituant les surfaces d'échange de chaleur, les gaz d'échappement et le fluide de refroidissement circulant entre deux plaques, en couches alternées, et des ailettes pouvant être prévues pour améliorer l'échange de chaleur.The current configuration of the EGR exchangers on the market corresponds to that of a metal heat exchanger generally made of stainless steel or aluminum, see for example, the DE 10028131 C1 . There are essentially two types of EGR heat exchanger: a first type consists of a housing inside which is placed a bundle of tubes for the passage of gases, the cooling fluid flowing through the housing outside the tubes; and the second type comprises a series of parallel plates constituting the heat exchange surfaces, the exhaust gases and the cooling fluid circulating between two plates, in alternating layers, and fins that can be provided to improve the exchange of heat. heat.

La majorité des composants des deux types d'échangeurs EGR sont métalliques, si bien que les échangeurs sont assemblés par des moyens mécaniques puis soudés au four ou soudées à l'arc ou au laser pour assurer un niveau d'étanchéité adéquat pour l'application envisagée.The majority of the components of both types of EGR exchangers are metallic, so the exchangers are assembled by mechanical means and then oven-welded or arc or laser-welded to provide an adequate level of sealing for the application. considered.

Dans certains cas, l'échangeur EGR peut également comporter des composants fabriqués en plastique, lesquels peuvent remplir une ou plusieurs fonctions sous forme d'une pièce unique.In some cases, the EGR exchanger can also include components made of plastic that can perform one or more functions as a single piece.

Les échangeurs EGR ont pour fonction principale l'échange de chaleur entre les gaz d'échappement et le fluide de refroidissement dans le but de refroidir les gaz. Les échangeurs EGR doivent également remplir d'autres fonctions secondaires, notamment l'assemblage au bloc moteur, le raccord au fluide de refroidissement ou le raccord au circuit d'échappement des gaz.EGR exchangers have the main function of exchanging heat between the exhaust gas and the cooling fluid in order to cool the gases. EGR exchangers must also perform other secondary functions, such as engine block assembly, coolant connection, or exhaust gas connection.

Afin de remplir ces fonctions secondaires, l'échangeur de chaleur intègre différents composants lui conférant ces fonctions. Cela signifie qu'un échangeur EGR doit disposer d'au moins deux raccords au fluide de refroidissement, d'au moins deux raccords aux gaz et d'au moins un élément ou patte de fixation à l'environnement moteur.In order to fulfill these secondary functions, the heat exchanger integrates different components giving it these functions. This means that an EGR exchanger must have at least two connections to the cooling fluid, at least two gas connections and at least one element or bracket to the engine environment.

Actuellement, les différents composants sont généralement joints par soudure au four ou par soudure à l'arc ou au laser. Dans d'autres cas, un composant peut intégrer plus d'une fonction, par exemple une patte de support de l'échangeur EGR sur le bloc moteur et un réservoir de gaz assurant le raccord aux gaz.Currently, the various components are usually joined by welding in the oven or by arc welding or laser welding. In other cases, a component can integrate more than one function, for example a support lug of the EGR exchanger on the engine block and a gas tank connecting the gases.

Du fait de la tendance sur le marché à une réduction des dimensions des moteurs, et à la mise en oeuvre des échangeurs de chaleur EGR non seulement dans les applications dites à haute pression (HP) mais aussi dans les applications dite à basse pression (LP), l'espace disponible pour l'échangeur et ses composants ne cesse de diminuer. Les environnements dans lesquels l'échangeur EGR doit être intégré sont de plus en plus complexes.Due to the trend on the market to a reduction of the dimensions of the engines, and to the implementation of the heat exchangers EGR not only in the so-called high-pressure (HP) applications but also in the so-called low-pressure applications (LP ), the space available for the heat exchanger and its components continues to decrease. The environments in which the EGR exchanger must be integrated are becoming more complex.

Il est donc important de mettre au point des échangeurs EGR compacts dotés de fonctions intégrées susceptibles d'être montés dans l'espace disponibleIt is therefore important to develop compact EGR exchangers with integrated functions that can be mounted in the available space

Il existe sur le marché différentes solutions, tant en plastique qu'en aluminium, qui intègrent différentes fonctions sous forme d'une pièce unique. Il n'est toutefois pas toujours possible de recourir à ces technologies du fait de problèmes de température ou de restrictions imposées par l'environnement dans la mesure où ces solutions présentent des dimensions supérieures à celles d'une solution classique à boitier métallique.There are different solutions on the market, both in plastic and in aluminum, which integrate different functions in the form of a single piece. However, it is not always possible to use these technologies because of temperature problems or restrictions imposed by the environment to the extent that these solutions have dimensions greater than those of a conventional metal case solution.

DESCRIPTION DE L'INVENTIONDESCRIPTION OF THE INVENTION

La présente invention a pour objet un échangeur de chaleur pour gaz, notamment pour les gaz d'échappement d'un moteur, permettant de remédier aux inconvénients des échangeurs connus dans la technique, apte à intégrer diverses fonctions sous forme d'une même pièce de raccord accouplée au boîtier de l'échangeur.The subject of the present invention is a gas heat exchanger, in particular for the exhaust gases of an engine, making it possible to overcome the drawbacks of heat exchangers known in the art, capable of integrating various functions in the form of a single piece of gas. coupling coupled to the heat exchanger housing.

L'échangeur de chaleur pour gaz, notamment pour les gaz d'échappement d'un moteur, objet de la présente invention, comprend un boîtier destiné à la circulation des gaz avec échange de chaleur avec un fluide de refroidissement, des moyens de raccord au circuit du fluide de refroidissement et au moins une pièce formant réservoir de gaz accouplée à l'une des extrémités du boîtier, ladite pièce intégrant au moins une patte de fixation au bloc moteur et des moyens de raccord au circuit des gaz, et est caractérisé en ce que lesdits moyens de raccord au circuit du fluide de refroidissement sont également intégrés à ladite pièce formant réservoir de gaz.The gas heat exchanger, in particular for the exhaust gas of an engine, which is the subject of the present invention, comprises a housing intended for the circulation of gases with heat exchange with a cooling fluid, means for connecting to the circuit of the cooling fluid and at least one piece forming a gas reservoir coupled to one end of the housing, said part integrating at least one fixing lug to the engine block and connecting means to the gas circuit, and is characterized in that said connecting means to the coolant circuit are also integrated with said gas reservoir part.

La pièce formant réservoir de gaz ainsi obtenue intègre plus de deux fonctions. Dans ce cas, ladite pièce non seulement peut intégrer le raccord du circuit de gaz et la patte de fixation au bloc moteur, comme cela est connu dans l'état de la technique, mais sert également de raccord au circuit du fluide de refroidissement.The gas reservoir part thus obtained incorporates more than two functions. In this case, said part not only can integrate the connection of the gas circuit and the fixing lug to the engine block, as known in the state of the art, but also serves as a connection to the cooling fluid circuit.

Parmi les principaux avantages de l'invention, citons les suivants :

  • La pièce formant réservoir de gaz intègre plusieurs composants, et peut donc doter l'échangeur EGR de plusieurs fonctions.
  • Le nombre réduit d'opérations d'assemblage nécessaires permet d'améliorer les tolérances finales de la pièce formant réservoir de gaz et de répondre ainsi aux exigences des constructeurs de véhicules.
  • La pièce formant réservoir de gaz peut être plus robuste qu'un assemblage de différentes parties plus sensible aux vibrations et à la manipulation.
  • La conception de la pièce formant réservoir de gaz peut être plus compacte que l'ensemble de pièces requises pour remplir toutes les fonctions, dans la mesure où il n'est pas nécessaire de tenir compte des exigences minimales de conception et d'assemblage d'un grand nombre de composants ni des tolérances d'accouplement, si bien qu'il est inutile de prévoir un espace libre minimal autour de la pièce ni de caractéristiques particulières ou de surfaces planes permettant l'assemblage (mécanique et/ou soudé), ni une zone libre autour de la pièce permettant l'accès des outils d'assemblage. Ladite pièce selon l'invention répond donc aux exigences des constructeurs liées à l'intégration de l'échangeur EGR au véhicule.
Among the main advantages of the invention, we can mention the following:
  • The gas reservoir part incorporates several components, and can therefore provide the EGR exchanger with several functions.
  • The reduced number of assembly operations required makes it possible to improve the final tolerances of the gas tank part and thus meet the requirements of the vehicle manufacturers.
  • The gas reservoir piece may be stronger than an assembly of different parts more sensitive to vibration and handling.
  • The design of the gas tank part may be more compact than the set of parts required to perform all functions, since it is not necessary to take into account the minimum design and assembly requirements of a large number of components and coupling tolerances, so that there is no need for a minimum free space around the workpiece or special features or flat surfaces for assembly (mechanical and / or welded), or a free zone around the part allowing the access of the assembly tools. Said part according to the invention thus meets the requirements of the manufacturers related to the integration of the EGR exchanger to the vehicle.

De préférence, la pièce formant réservoir de gaz est entièrement fabriquée au moyen d'un procédé de microfusion et de soudure au boîtier de l'échangeur. Il convient à cet égard de respecter certains critères au moment de la conception, cette pièce devant en effet être démoulable.Preferably, the gas reservoir piece is entirely made by means of a process of microfusion and welding to the heat exchanger housing. In this respect, it is necessary to respect certain criteria moment of the design, this piece must indeed be demoldable.

Éventuellement, la pièce formant réservoir de gaz est fabriquée en plusieurs parties si le procédé de démoulage n'est pas réalisable ou s'il s'avère trop complexe, lesdites parties étant soudées entre elles et au boitier de l'échangeur pour assurer l'étanchéité du fluide de refroidissement et des gaz.Optionally, the gas reservoir part is manufactured in several parts if the demolding process is not feasible or if it proves to be too complex, said parts being welded together and to the housing of the exchanger to ensure the sealing of coolant and gases.

Avantageusement, la pièce formant réservoir de gaz peut être fabriquée en acier inoxydable ou en aluminium. La fabrication en aluminium a l'avantage de réduire le coût de la pièce et d'améliorer légèrement le rendement de l'échangeur EGR du fait de la meilleure conductivité de l'aluminium par rapport à celle de l'acier inoxydable.Advantageously, the gas reservoir piece may be made of stainless steel or aluminum. Aluminum fabrication has the advantage of reducing the cost of the part and slightly improving the efficiency of the EGR exchanger due to the better conductivity of aluminum compared to that of stainless steel.

De préférence, la pièce formant réservoir de gaz est fixée au boîtier de l'échangeur au moyen d'un procédé de soudure au four ou de soudure à l'arc ou au laser. Ce type de fixation peut être envisagé même si leurs matériaux constitutifs sont différents, pourvu que ce type de fixation soit réalisable.Preferably, the gas reservoir member is attached to the heat exchanger housing by means of a method of welding in the oven or arc welding or laser welding. This type of attachment can be considered even if their constituent materials are different, provided that this type of attachment is feasible.

En variante, la pièce formant réservoir de gaz peut comporter des orifices permettant de la fixer au boitier de l'échangeur au moyen d'éléments de boulonnerie.In a variant, the gas reservoir part may have orifices enabling it to be fastened to the heat exchanger box by means of bolting elements.

Selon un mode de réalisation de l'invention, la trajectoire du fluide de refroidissement passe par la patte de fixation et par un pont intégré à ladite pièce formant réservoir de gaz et raccordé au boîtier de l'échangeur.According to one embodiment of the invention, the path of the cooling fluid passes through the bracket and a bridge integrated in said gas reservoir part and connected to the housing of the exchanger.

Selon un autre mode de réalisation de l'invention, la trajectoire du fluide de refroidissement passe par un conduit intégré à ladite pièce formant réservoir de gaz et raccordé au boîtier de l'échangeur. Dans ce cas, le raccord du fluide de refroidissement ne s'effectue pas par la patte de fixation mais par un conduit ou tube également porté par la pièce formant réservoir de gaz, réalisé directement par microfusion ou sous forme de pièce supplémentaire fixée par divers procédés tels qu'une soudure, un collage ou un assemblage mécanique.According to another embodiment of the invention, the path of the cooling fluid passes through an integrated duct to said gas reservoir part and connected to the heat exchanger housing. In this case, the connection of the cooling fluid is not effected by the fixing lug but by a pipe or tube also carried by the component forming a reservoir. gas, made directly by microfusion or in the form of additional part fixed by various processes such as welding, bonding or mechanical assembly.

Éventuellement, la pièce formant réservoir de gaz comporte un rebord ou une bride raccordable à une interface du circuit des gaz.Optionally, the gas reservoir member has a flange or flange connectable to a gas circuit interface.

De préférence, la pièce formant réservoir de gaz comporte des orifices taraudés permettant la mise en place d'un thermostat pour le fluide de refroidissement.Preferably, the gas reservoir part comprises threaded orifices for setting up a thermostat for the cooling fluid.

Avantageusement, la pièce formant réservoir de gaz comporte un orifice permettant l'évacuation de l'échangeur des gaz piégés dans le circuit du fluide de refroidissement.Advantageously, the gas reservoir part comprises an orifice for evacuation of the exchanger of the trapped gases in the cooling fluid circuit.

BRÈVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

Dans le but de faciliter la description de ce qui vient d'être exposé, on joint des dessins dans lesquels sont représentés, sous forme schématique et uniquement à titre d'exemple non limitatif, deux cas pratiques de modes de réalisation de l'échangeur de chaleur pour gaz selon l'invention. Dans ces dessins :

  • la figure 1 est une vue en perspective de l'échangeur de chaleur montrant la pièce formant réservoir de gaz selon un premier mode de réalisation de l'invention ;
  • les figures 2 et 3 sont différentes vues en perspective de la pièce formant réservoir de gaz illustrée à la figure 1 ;
  • la figure 4 est une vue en perspective de l'échangeur de chaleur montrant la pièce formant réservoir de gaz selon un deuxième mode de réalisation de l'invention ; et
  • la figure 5 est une vue en perspective différente de la pièce formant réservoir de gaz illustrée à la figure 4.
In order to facilitate the description of what has just been exposed, drawings are enclosed in which are shown in schematic form and by way of non-limiting example only two practical examples of embodiments of the heat exchanger. heat for gas according to the invention. In these drawings:
  • the figure 1 is a perspective view of the heat exchanger showing the gas reservoir part according to a first embodiment of the invention;
  • the Figures 2 and 3 are different perspective views of the gas reservoir part illustrated in FIG. figure 1 ;
  • the figure 4 is a perspective view of the heat exchanger showing the gas reservoir part according to a second embodiment of the invention; and
  • the figure 5 is a different perspective view of the gas reservoir part shown in FIG. the figure 4 .

DESCRIPTION DE MODES DE RÉALISATION PRÉFÉRÉSDESCRIPTION OF PREFERRED EMBODIMENTS

En référence aux figures 1 à 3, l'échangeur de chaleur 1 pour gaz, notamment pour les gaz d'échappement d'un moteur, comprend un boîtier 2 destiné à la circulation des gaz avec échange de chaleur avec un fluide de refroidissement.With reference to Figures 1 to 3 , the heat exchanger 1 for gas, in particular for the exhaust gas of an engine, comprises a housing 2 intended for the circulation of gases with heat exchange with a cooling fluid.

L'échangeur 1 comporte une entrée 3 et une sortie 4 des gaz à refroidir disposées à des extrémités opposées du boîtier 2, ainsi qu'une entrée 5 et une sortie 6 du fluide de refroidissement, les sens de circulation indiqués pouvant être inversés. Le boîtier 2 comporte à l'une des ses extrémités une pièce formant réservoir de gaz 7 et à son autre extrémité une bride 8 permettant le raccord au circuit des gaz de recirculation. L'échangeur 1 comporte également une bride à fonction de patte de fixation 9 permettant son montage sur le bloc moteur.The exchanger 1 comprises an inlet 3 and an outlet 4 of the gases to be cooled disposed at opposite ends of the housing 2, and an inlet 5 and an outlet 6 of the cooling fluid, the indicated flow directions being reversible. The housing 2 comprises at one of its ends a gas-tank-forming part 7 and at its other end a flange 8 allowing the connection of the recirculation gases to the circuit. The exchanger 1 also comprises a flange function of fixing lug 9 for mounting on the engine block.

Ledit réservoir de gaz 7 est apte à intégrer sous forme d'une pièce unique le raccord 4 au circuit des gaz, le raccord 6 au circuit du fluide de refroidissement, la patte de fixation 9 au bloc moteur, et de prendre en charge d'autres fonctions.Said gas tank 7 is adapted to integrate as a single piece the connection 4 to the gas circuit, the connection 6 to the circuit of the cooling fluid, the fixing lug 9 to the engine block, and to take charge of other functions.

Ladite pièce formant réservoir de gaz 7 peut être entièrement fabriquée au moyen d'un procédé de microfusion et de soudure au boîtier 2 de l'échangeur 1 ; ou bien être fabriquée en plusieurs parties si le procédé de démoulage n'est pas réalisable ou s'il s'avère trop complexe, lesdites parties étant ensuite soudées entre elles et au boîtier 2 de l'échangeur 1 pour assurer l'étanchéité du fluide de refroidissement et des gaz.Said gas reservoir part 7 can be entirely manufactured by means of a process of microfusion and welding to the housing 2 of the exchanger 1; or be made in several parts if the demolding process is not feasible or if it proves too complex, said parts then being welded together and to the housing 2 of the exchanger 1 to ensure the fluid tightness cooling and gases.

Ladite pièce formant réservoir de gaz 7 peut être fabriquée en acier inoxydable ou en aluminium. La fabrication en aluminium a l'avantage de réduire le coût de la pièce et d'améliorer légèrement le rendement de l'échangeur 1 du fait de la meilleure conductivité de l'aluminium par rapport à celle de l'acier inoxydable.Said gas reservoir piece 7 may be made of stainless steel or aluminum. Aluminum manufacturing has the advantage of reducing the cost of the part and slightly improve the efficiency of the exchanger 1 because of the better conductivity of aluminum compared to that of stainless steel.

Ladite pièce formant réservoir de gaz 7 peut être fixée au boîtier 2 de l'échangeur 1 au moyen d'un procédé de soudure au four ou de soudure à l'arc ou au laser ; ou bien être fixée au boîtier 2 au moyen d'éléments de boulonnerie.Said gas reservoir piece 7 can be fixed to the casing 2 of the exchanger 1 by means of a method of welding in the oven or welding arc or laser; or be attached to the housing 2 by means of bolts.

La pièce formant réservoir de gaz 7 peut également comporter des orifices taraudés permettant la mise en place d'un thermostat pour le fluide de refroidissement, ainsi qu'orifice permettant l'évacuation de l'échangeur des gaz piégés dans le circuit du fluide de refroidissement.The gas reservoir part 7 may also comprise threaded orifices allowing the establishment of a thermostat for the cooling fluid, as well as an orifice allowing the evacuation of the exchanger of the gases trapped in the circuit of the cooling fluid. .

Selon un premier mode de réalisation de l'invention représenté aux figures 1 à 3, la trajectoire du fluide de refroidissement passe par un orifice prévu au niveau de la patte de fixation 9 et par un pont 10 intégré à ladite pièce formant réservoir de gaz 7 et raccordé au boîtier 2 de l'échangeur 1. Autrement dit, la patte de fixation 9 et le pont 10 sont en communication fluidique.According to a first embodiment of the invention shown in Figures 1 to 3 , the path of the cooling fluid passes through an orifice provided at the fastening lug 9 and a bridge 10 integrated in said gas reservoir part 7 and connected to the casing 2 of the exchanger 1. In other words, the flap 9 and the bridge 10 are in fluid communication.

Selon un autre mode de réalisation de l'invention représenté aux figures 4 et 5, la trajectoire du fluide de refroidissement passe par un conduit ou tube 11 intégré à ladite pièce formant réservoir de gaz 7' et raccordé au boîtier 2 de l'échangeur 1.According to another embodiment of the invention shown in Figures 4 and 5 the path of the cooling fluid passes through a duct or tube 11 integrated in said gas reservoir piece 7 'and connected to the casing 2 of the exchanger 1.

Dans ce cas, le raccord du fluide de refroidissement ne s'effectue pas par la patte de fixation 9 mais par un conduit ou tube 11 également porté par la pièce formant réservoir de gaz 7', réalisé directement par microfusion ou sous forme de pièce supplémentaire fixée par divers procédés tels qu'une soudure, un collage ou un assemblage mécanique. Par ailleurs, la pièce formant réservoir de gaz 7' comporte également un rebord ou une bride 12 raccordable à une interface du circuit des gaz.In this case, the connection of the cooling fluid is not effected by the fixing lug 9 but by a pipe or tube 11 also carried by the gas-reservoir part 7 ', produced directly by microfusion or in the form of an additional part fixed by various methods such as welding, gluing or mechanical assembly. Furthermore, the gas-reservoir part 7 'also comprises a flange or flange 12 connectable to an interface of the gas circuit.

Claims (10)

  1. Heat exchanger (1) for gas, notably for the exhaust gases of an engine, comprising a housing (2) intended for the circulation of the gases with exchange of heat with a fluid coolant, means (6, 11) of coupling to the coolant circuit and at least one component forming a gas reservoir (7, 7') coupled to one of the ends of the housing (2), the said component (7, 7') incorporating at least one fixing lug (9) for fixing to the engine block and means (4) of coupling to the gas circuit, characterized in that the said means (6, 11) of coupling to the coolant circuit are also incorporated into the said component that forms a gas reservoir (7, 7'), the path of the coolant passing through the fixing lug (9) and along a bridge (10) incorporated into the said component that forms a gas reservoir (7) and coupled to the housing (2) of the exchanger (1).
  2. Exchanger (1) according to Claim 1, the said component forming a gas reservoir (7, 7') being manufactured entirely by means of a microfusion investment casting method and welding to the housing (2) of the exchanger (1).
  3. Exchanger (1) according to Claim 1, the component forming a gas reservoir (7, 7') being manufactured in several parts if the demoulding method cannot be achieved or proves too complex, the said parts then being welded to one another and to the housing (2) of the exchanger (1) in order to provide sealing against the coolant and the gases.
  4. Exchanger (1) according to any one of Claims 1 to 3, the component forming a gas reservoir (7, 7') being made of stainless steel.
  5. Exchanger (1) according to any one of Claims 1 to 3, the component forming a gas reservoir (7, 7') being made of aluminium.
  6. Exchanger (1) according to any one of Claims 1 to 5, the component forming a gas reservoir (7, 7') being fixed to the housing (2) of the exchanger (1) by means of a furnace welding or arc or laser welding method.
  7. Exchanger (1) according to any one of Claims 1 to 5, the component forming a gas reservoir (7, 7') comprising orifices allowing it to be attached to the housing (2) of the exchanger (1) using ironmongery fittings.
  8. Exchanger (1) according to any one of the preceding claims, the component forming a gas reservoir (7') comprising a rim or flange (12) that can be coupled to an interface of the gas circuit.
  9. Exchanger (1) according to any one of the preceding claims, the component forming a gas reservoir (7, 7') comprising tapped orifices allowing the installation of a thermostat for the coolant.
  10. Exchanger (1) according to any one of the preceding claims, the component forming a gas reservoir (7, 7') comprising an orifice allowing gases trapped in the coolant circuit to be vented from the exchanger (1) .
EP11170763.4A 2010-06-28 2011-06-21 Heat exchanger for gas, in particular for the exhaust gas of an engine Active EP2400140B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201031002A ES2399036B1 (en) 2010-06-28 2010-06-28 HEAT EXCHANGER FOR GASES IN SPECIAL EXHAUST GASES OF A MOTOR.

Publications (3)

Publication Number Publication Date
EP2400140A2 EP2400140A2 (en) 2011-12-28
EP2400140A3 EP2400140A3 (en) 2016-10-05
EP2400140B1 true EP2400140B1 (en) 2018-09-12

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EP11170763.4A Active EP2400140B1 (en) 2010-06-28 2011-06-21 Heat exchanger for gas, in particular for the exhaust gas of an engine

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6606375B2 (en) * 2015-02-09 2019-11-13 現代自動車株式会社 Integrated EGR cooler and integrated EGR cooling system including the same

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Publication number Priority date Publication date Assignee Title
US5732688A (en) * 1996-12-11 1998-03-31 Cummins Engine Company, Inc. System for controlling recirculated exhaust gas temperature in an internal combustion engine
DE19750588B4 (en) * 1997-11-17 2016-10-13 MAHLE Behr GmbH & Co. KG Device for exhaust gas recirculation for an internal combustion engine
DE19906401C1 (en) * 1999-02-16 2000-08-31 Ranco Inc Of Delaware Wilmingt Exhaust gas recirculation system
DE19960929A1 (en) * 1999-12-17 2001-06-28 Bosch Gmbh Robert Switchable heat exchanger
DE10028131C1 (en) * 2000-06-07 2001-12-13 Daimler Chrysler Ag Exhaust gas feedback system for internal combustion engine has flange component provided with exhaust gas feedback channels leading to exhaust gas feedback line and flow control valve
DE10321638A1 (en) * 2002-05-15 2004-01-08 Behr Gmbh & Co. Kg Switchable waste gas exchanger for e.g. exhaust gas recirculation lines in vehicle engines, switching valve operation is controlled according to coolant fluid temperature
US6997143B2 (en) * 2003-12-12 2006-02-14 Visteon Global Technologies, Inc. Integrated heat exchange and fluid control device
ES2304092B1 (en) * 2006-11-17 2009-07-03 Valeo Termico S.A. HEAT EXCHANGER FOR GASES, ESPECIALLY OF EXHAUST GASES OF AN ENGINE.
DE102006054723A1 (en) * 2006-11-21 2008-05-29 Behr Gmbh & Co. Kg Heat exchanger, in particular exhaust gas heat exchanger
US8443593B2 (en) * 2008-12-12 2013-05-21 Westcast Industries, Inc. Liquid-cooled exhaust valve assembly

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Also Published As

Publication number Publication date
ES2700735T3 (en) 2019-02-19
ES2399036A1 (en) 2013-03-25
EP2400140A2 (en) 2011-12-28
ES2399036B1 (en) 2014-01-28
EP2400140A3 (en) 2016-10-05

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