EP1925899B1 - 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
EP1925899B1
EP1925899B1 EP07120252A EP07120252A EP1925899B1 EP 1925899 B1 EP1925899 B1 EP 1925899B1 EP 07120252 A EP07120252 A EP 07120252A EP 07120252 A EP07120252 A EP 07120252A EP 1925899 B1 EP1925899 B1 EP 1925899B1
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EP
European Patent Office
Prior art keywords
exchanger
egr valve
rim
branch pipe
connecting means
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EP07120252A
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German (de)
French (fr)
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EP1925899A2 (en
EP1925899A3 (en
Inventor
Francisco Lopez Lazaro
Abel Ruiz
Silvia Guillen Lambea
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Valeo Termico SA
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Valeo Termico SA
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases

Definitions

  • the present invention relates to a heat exchanger for gas, in particular for the exhaust gases of an engine.
  • the invention is particularly applicable to exhaust gas recirculation exchangers (Exhaust Gas Recirculation Coolers or EGRC), exhaust gas exchangers for the exhaust line thermal regulation (ETR) , and charge air coolers or intercoolers (Charge Air Coolers or CAC).
  • EGRC exhaust Gas Recirculation Coolers
  • ETR exhaust line thermal regulation
  • CAC Charge Air Coolers
  • a well-established practice in the automotive field is to use a diesel engine exhaust gas recirculation system, known as EGR or "Exhaust Gas Recycling", to mix these gases with the engine. intake air since the presence of the exhaust gas in the mixture reduces the formation of nitrogen oxides (NOx).
  • EGR diesel engine exhaust gas recirculation system
  • NOx nitrogen oxides
  • the exhaust gases Before being mixed with the intake air, the exhaust gases can be cooled in a heat exchanger (EGRC or "Exhaust Gas Recycling Cooler”) installed in the loop of the EGR system, with the aim of improving the efficiency of the system.
  • EGRC Exhaust Gas Recycling Cooler
  • the system loop further includes a valve (EGR valve) regulating the passage of exhaust gases therethrough.
  • EGR valve regulating the passage of exhaust gases therethrough.
  • the heat exchanger itself can have several different configurations: it can, for example, include a tubular carcass inside which are arranged a series of tubes parallel for the passage of gases, the cooling fluid flowing in the carcass outside the tubes; in another embodiment, the exchanger consists of a series of parallel plates constituting the heat exchange surfaces, so that the exhaust gas and the cooling fluid circulate between two plates in alternating layers.
  • the carcass is joined to the lines of the recirculation line by connecting means which may take the form of a V-shaped connection or a peripheral flange or flange, depending on the design of the recirculation line where assembly of the exchanger.
  • peripheral rim may be assembled together with a gas reservoir, the gas reservoir then constituting an intermediate piece between the carcass and the rim.
  • the rim can also be assembled directly on the carcass. This design is often the case where the heat exchanger is attached directly to an EGR valve.
  • the most common design incorporates a bypass conduit carrying coolant fluid, flowing through the EGR exchanger, to the EGR valve. Since the EGR exchanger is assembled to the EGR circuit by a peripheral rim, it is therefore necessary to manufacture the bypass duct of the cooling fluid by incorporating it into said peripheral rim.
  • the peripheral flange integrating the bypass duct of the cooling fluid has a complex configuration whose manufacture generally requires a process of microfusion or sintering.
  • this type of process has the disadvantage of being expensive because of the complexity of the workpiece.
  • the patent DE 10359054 discloses a method of manufacturing a peripheral flange by stamping, the peripheral flange does not integrate any bypass duct.
  • the subject of the present invention is a heat exchanger for gases, in particular for the exhaust gases of an engine, making it possible to overcome the drawbacks of exchangers known in the art, said exchanger benefiting from reduced manufacturing costs and ensuring better integration.
  • bypass duct conveying the cooling fluid of the EGR exchanger to the EGR valve.
  • the gas heat exchanger in particular for the exhaust gases of an engine, object of the present invention, is of the type comprising a plurality of parallel ducts arranged inside a carcass, in which the gases circulate. to cool by exchange thermal with a cooling fluid; connecting means to a conduit of the gas recirculation line; and a bypass duct integrated with said connecting means and for circulating the cooling fluid to an EGR valve regulating the passage of gases through the exchanger; and is characterized in that said connecting means integrated in said bypass duct comprise at least two parts manufactured by stamping.
  • said at least two stamped parts connecting means are joined together by welding.
  • the coupling means integrated in said bypass duct comprise a first peripheral flange connected to the recirculation line and to the EGR valve, and a second rim comprising said stamped bypass duct, the two flanges being joined. between them.
  • the surface of the second flange completely or partially covers the surface of the first flange.
  • the second rim incorporates a tubular section of short length to assemble directly to the carcass.
  • an inlet of the bypass duct is formed in said tubular section and connected to a corresponding hole of the carcass.
  • the two flanges incorporate a cooling fluid inlet orifice from the bypass duct to the EGR valve, and a coolant outlet port from the EGR valve to the cooling circuit.
  • the coupling means also comprise a conduit for guiding the cooling fluid from the EGR valve to the cooling circuit.
  • the heat exchanger 1 is composed of a carcass 2 whose inside contains a bundle of parallel ducts (not shown) for the passage of the gases to be cooled.
  • a cooling fluid circulates in the carcass 2, outside the ducts.
  • the carcass 2 has a substantially rectangular section and is closed to one of its ends to receive the bundle of ducts which, in this case, is of the "U" type, in other words the inlet and the outlet of said ducts are situated on the same side at the free end of the carcass 2.
  • the exchanger 1 also incorporates connection means 3 to a conduit of the gas recirculation line (not shown), and a bypass duct 6 integrated with said connection means 3, for circulating the cooling fluid to an EGR valve (not shown) which regulates the passage of gases through the exchanger 1.
  • said coupling means 3 comprise two peripheral flanges 4,5 produced by stamping.
  • the first peripheral flange 4 is connected to the recirculation line and the EGR valve, and the second peripheral flange 5 comprises said branch duct 6 stamped, the two flanges 4,5 being joined together by welding.
  • the first flange 4 serves to connect the carcass 2 to the recirculation line and the EGR valve, ensuring adequate sealing. Its mechanical strength is ensured by its embossed design having a shape and a size adapted.
  • the second edge 5 makes it possible to create the walls of said bypass duct 6.
  • the surface of said second flange 5 can completely cover the surface of the first flange 4 (see FIG. Figures 1 and 2 ), or, in another embodiment, only a part thereof, so as to save the material (see figure 3 ).
  • the two stamped flanges 4.5 are made of stainless steel, or may be made of any other material that may reduce weight and manufacturing costs.
  • the second rim 5 also incorporates a tubular section 7 of short length to be assembled directly to the carcass 2, for example by welding.
  • the inlet orifice 8 of the bypass duct 6 is formed in said tubular section 7 and connected to a corresponding orifice 9 of the carcass 2.
  • the two flanges 4,5 likewise incorporate a coolant inlet 10 from the bypass duct 6 to the EGR valve, and an outlet 11 of the coolant from the EGR valve to the cooling circuit.
  • the coupling means 3 also comprise a conduit 12 for guiding the cooling fluid, through the outlet orifice 11, from the EGR valve to the cooling circuit (see FIG. figure 3 ).
  • the two peripheral rims 4,5 also incorporate orifices 13 intended to receive hardware elements making it possible to fix them to the duct of the gas recirculation line.
  • the coolant is returned to the cooling circuit through the outlet orifice 11 of the flanges 4,5, being guided by the corresponding conduit 12 of the cooling circuit.

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

Abstract

The exchanger (1) has a set of ducts parallely arranged inside a framework (2), where an exhaust gas to be cooled by heat exchange with a cooling fluid is circulated in the ducts. A connection unit (3) is connected with a duct of an exhaust gas recirculation line. A bypass duct (6) is integrated to the connection unit, and circulates the cooling fluid till an exhaust gas recirculation valve regulates the passage of the gas across the exchanger. The connection unit has two peripheral joint edges (4, 5) formed by stamping using stainless steel.

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 s'applique tout particulièrement aux échangeurs de recirculation des gaz d'échappement d'un moteur (Exhaust Gas Recirculation Coolers ou EGRC), aux échangeurs de gaz d'échappement pour la régulation thermique de la ligne d'échappement (ETR), et aux refroidisseurs de l'air de suralimentation ou intercoolers (Charge Air Coolers ou CAC).The invention is particularly applicable to exhaust gas recirculation exchangers (Exhaust Gas Recirculation Coolers or EGRC), exhaust gas exchangers for the exhaust line thermal regulation (ETR) , and charge air coolers or intercoolers (Charge Air Coolers or CAC).

ARRIÈRE-PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION

Une pratique bien établie dans le domaine de l'automobile consiste à utiliser un système de recirculation des gaz d'échappement d'un moteur diesel, connu sous le nom de EGR ou "Exhaust Gas Recycling", afin de mélanger ces gaz à l'air d'admission dans la mesure où la présence des gaz d'échappement dans le mélange permet de réduire la formation d'oxydes d'azote (NOx).A well-established practice in the automotive field is to use a diesel engine exhaust gas recirculation system, known as EGR or "Exhaust Gas Recycling", to mix these gases with the engine. intake air since the presence of the exhaust gas in the mixture reduces the formation of nitrogen oxides (NOx).

Avant d'être mélangés à l'air d'admission, les gaz d'échappement peuvent être refroidis dans un échangeur de chaleur (EGRC ou "Exhaust Gas Recycling Cooler") installé dans la boucle du système EGR, dans le but d'améliorer l'efficacité du système.Before being mixed with the intake air, the exhaust gases can be cooled in a heat exchanger (EGRC or "Exhaust Gas Recycling Cooler") installed in the loop of the EGR system, with the aim of improving the efficiency of the system.

La boucle du système comprend en outre une soupape (soupape EGR) régulant le passage des gaz d'échappement à travers celui-ci.The system loop further includes a valve (EGR valve) regulating the passage of exhaust gases therethrough.

L'échangeur de chaleur proprement dit peut présenter plusieurs configurations différentes : il peut, par exemple, comprendre une carcasse tubulaire à l'intérieur de laquelle sont disposés une série de tubes parallèles pour le passage des gaz, le fluide de refroidissement circulant dans la carcasse à l'extérieur des tubes ; dans une autre réalisation, l'échangeur se compose d'une série de plaques parallèles constituant les surfaces d'échange de chaleur, de manière à ce que les gaz d'échappement et le fluide de refroidissement circulent entre deux plaques, en couches alternées.The heat exchanger itself can have several different configurations: it can, for example, include a tubular carcass inside which are arranged a series of tubes parallel for the passage of gases, the cooling fluid flowing in the carcass outside the tubes; in another embodiment, the exchanger consists of a series of parallel plates constituting the heat exchange surfaces, so that the exhaust gas and the cooling fluid circulate between two plates in alternating layers.

La carcasse est jointe aux conduits de la ligne de recirculation par des moyens de raccord qui peuvent prendre la forme d'un raccord en V ou d'un rebord périphérique ou bride, en fonction de la conception de la ligne de recirculation où s'effectue l'assemblage de l'échangeur.The carcass is joined to the lines of the recirculation line by connecting means which may take the form of a V-shaped connection or a peripheral flange or flange, depending on the design of the recirculation line where assembly of the exchanger.

Dans le cas d'un rebord périphérique de raccord ou bride, deux conceptions différentes sont possibles. Le rebord périphérique peut être assemblé conjointement avec un réservoir de gaz, le réservoir de gaz constituant alors une pièce intermédiaire entre la carcasse et le rebord. Le rebord peut également être assemblé directement sur la carcasse. Cette conception correspond souvent aux cas où l'échangeur est joint directement à une soupape EGR.In the case of a peripheral flange fitting or flange, two different designs are possible. The peripheral rim may be assembled together with a gas reservoir, the gas reservoir then constituting an intermediate piece between the carcass and the rim. The rim can also be assembled directly on the carcass. This design is often the case where the heat exchanger is attached directly to an EGR valve.

Dans certaines applications de circuits EGR, il est nécessaire de refroidir la soupape EGR. Dans ce cas, la conception la plus courante incorpore un conduit de dérivation acheminant le fluide de refroidissement, circulant à travers l'échangeur EGR, jusqu'à la soupape EGR. Comme l'échangeur EGR est assemblé au circuit EGR par un rebord périphérique, il est donc nécessaire de fabriquer le conduit de dérivation du fluide de refroidissement en l'incorporant audit rebord périphérique.In some EGR applications, it is necessary to cool the EGR valve. In this case, the most common design incorporates a bypass conduit carrying coolant fluid, flowing through the EGR exchanger, to the EGR valve. Since the EGR exchanger is assembled to the EGR circuit by a peripheral rim, it is therefore necessary to manufacture the bypass duct of the cooling fluid by incorporating it into said peripheral rim.

Le rebord périphérique intégrant le conduit de dérivation du fluide de refroidissement présente une configuration complexe dont la fabrication nécessite généralement un processus de microfusion ou de frittage. Or, ce type de processus présente l'inconvénient d'être onéreux du fait de la complexité de la pièce à usiner.The peripheral flange integrating the bypass duct of the cooling fluid has a complex configuration whose manufacture generally requires a process of microfusion or sintering. However, this type of process has the disadvantage of being expensive because of the complexity of the workpiece.

Le brevet DE 10359054 décrit un procédé de fabrication d'un rebord périphérique par estampage, ce rebord périphérique n'intégrant toutefois aucun conduit de dérivation.The patent DE 10359054 discloses a method of manufacturing a peripheral flange by stamping, the peripheral flange does not integrate any bypass duct.

La demande de brevet espagnol nº 200600875 , non encore publiée et de même titulaire que la présente invention, décrit un échangeur de chaleur dont le rebord périphérique est intégré en une seule pièce à une plaque de support des extrémités du faisceau de tubes ou un tronçon tubulaire jouant le rôle de réservoir de gaz, ladite pièce étant fabriquée par estampage à partir d'une tôle mince.Spanish patent application no. 200600875 , not yet published and of the same holder as the present invention, describes a heat exchanger whose peripheral rim is integrated in one piece to a support plate of the ends of the bundle of tubes or a tubular section acting as a gas reservoir said piece being made by stamping from a thin sheet.

La demande de brevet international WO 03/09826 A1 décrit un échangeur thermique comportant un conduit de fluide de refroidissement intégré. La demande de brevet européen EP 1367252 A2 décrit un procédé de fabrication d'un réservoir d'entrée d'un échangeur de chaleur par estampage.International patent application WO 03/09826 A1 discloses a heat exchanger having an integrated cooling fluid conduit. The European patent application EP 1367252 A2 discloses a method of manufacturing an inlet reservoir of a stamped heat exchanger.

On ne connaît toutefois aucun échangeur qui incorpore un rebord périphérique fabriqué par estampage et qui intègre en outre un conduit de dérivation permettant d'acheminer le fluide de refroidissement jusqu'à la soupape EGR.However, there is no known exchanger which incorporates a stamped peripheral flange and which also incorporates a bypass duct for conveying the cooling fluid to the EGR valve.

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, ledit échangeur bénéficiant de coûts de fabrication réduits et assurant une meilleure intégration du conduit de dérivation acheminant le fluide de refroidissement de l'échangeur EGR à la soupape EGR.The subject of the present invention is a heat exchanger for gases, in particular for the exhaust gases of an engine, making it possible to overcome the drawbacks of exchangers known in the art, said exchanger benefiting from reduced manufacturing costs and ensuring better integration. bypass duct conveying the cooling fluid of the EGR exchanger to the EGR valve.

L'échangeur de chaleur pour gaz, notamment pour les gaz d'échappement d'un moteur, objet de la présente invention, est du type comprenant une pluralité de conduits parallèles disposés à l'intérieur d'une carcasse, dans lesquels circulent les gaz à refroidir par échange thermique avec un fluide de refroidissement ; des moyens de raccord à un conduit de la ligne de recirculation des gaz ; et un conduit de dérivation intégré auxdits moyens de raccord et destiné à faire circuler le fluide de refroidissement jusqu'à une soupape EGR régulant le passage des gaz à travers l'échangeur ; et est caractérisé en ce que lesdits moyens de raccord intégrés audit conduit de dérivation comprennent au moins deux pièces fabriquées par estampage.The gas heat exchanger, in particular for the exhaust gases of an engine, object of the present invention, is of the type comprising a plurality of parallel ducts arranged inside a carcass, in which the gases circulate. to cool by exchange thermal with a cooling fluid; connecting means to a conduit of the gas recirculation line; and a bypass duct integrated with said connecting means and for circulating the cooling fluid to an EGR valve regulating the passage of gases through the exchanger; and is characterized in that said connecting means integrated in said bypass duct comprise at least two parts manufactured by stamping.

De cette manière, il est possible de réduire le poids desdits moyens de raccord et d'en diminuer sensiblement les coûts de fabrication par rapport aux moyens de raccord de l'état de la technique fabriqués par microfusion ou frittage.In this way, it is possible to reduce the weight of said connecting means and to substantially reduce the manufacturing costs compared to connection means of the state of the art made by microfusion or sintering.

De préférence, lesdites au moins deux pièces estampées des moyens de raccord sont jointes entre elles par soudure.Preferably, said at least two stamped parts connecting means are joined together by welding.

Selon une réalisation de la présente invention, les moyens de raccord intégrés audit conduit de dérivation comprennent un premier rebord périphérique raccordé à la ligne de recirculation et à la soupape EGR, et un deuxième rebord comprenant ledit conduit de dérivation estampé, les deux rebords étant joints entre eux.According to an embodiment of the present invention, the coupling means integrated in said bypass duct comprise a first peripheral flange connected to the recirculation line and to the EGR valve, and a second rim comprising said stamped bypass duct, the two flanges being joined. between them.

Facultativement, la surface du deuxième rebord recouvre complètement ou partiellement la surface du premier rebord.Optionally, the surface of the second flange completely or partially covers the surface of the first flange.

Avantageusement, le deuxième rebord incorpore un tronçon tubulaire de faible longueur permettant de l'assembler directement à la carcasse.Advantageously, the second rim incorporates a tubular section of short length to assemble directly to the carcass.

De préférence, un orifice d'entrée du conduit de dérivation est ménagé dans ledit tronçon tubulaire et raccordé à un orifice correspondant de la carcasse.Preferably, an inlet of the bypass duct is formed in said tubular section and connected to a corresponding hole of the carcass.

Avantageusement, les deux rebords incorporent un orifice d'entrée de fluide de refroidissement depuis le conduit de dérivation jusqu'à la soupape EGR, et un orifice de sortie du fluide de refroidissement depuis la soupape EGR jusqu'au circuit de refroidissement.Advantageously, the two flanges incorporate a cooling fluid inlet orifice from the bypass duct to the EGR valve, and a coolant outlet port from the EGR valve to the cooling circuit.

De préférence, les moyens de raccord comprennent également un conduit de guidage du fluide de refroidissement depuis la soupape EGR jusqu'au circuit de refroidissement.Preferably, the coupling means also comprise a conduit for guiding the cooling fluid from the EGR valve to the cooling circuit.

BRÈVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

Dans le but de faciliter la description de ce qui a été exposé précédemment, on joint des dessins dans lesquels est représenté, sous forme schématique et uniquement à titre d'exemple non limitatif, un cas pratique de réalisation de l'échangeur de chaleur pour gaz, notamment pour les gaz d'échappement d'un moteur, de l'invention. Dans ces dessins :

  • la figure 1 est une vue en perspective et éclatée des deux rebords périphériques ;
  • la figure 2 est une vue en perspective des deux rebords joints et de la carcasse avant son assemblage à l'ensemble des deux rebords ; et
  • la figure 3 est une vue en perspective des deux rebords et de la carcasse montés, le deuxième rebord présentant un demi-profil selon une autre réalisation.
In order to facilitate the description of what has been explained above, drawings are joined in which is shown, in schematic form and only by way of non-limiting example, a practical case of realization of the heat exchanger for gas , in particular for the exhaust gases of an engine, of the invention. In these drawings:
  • the figure 1 is a perspective and exploded view of the two peripheral edges;
  • the figure 2 is a perspective view of the two joined flanges and the carcass before assembly to all of the two flanges; and
  • the figure 3 is a perspective view of the two flanges and the carcass mounted, the second flange having a half-profile according to another embodiment.

DESCRIPTION D'UNE RÉALISATION PRÉFÉRÉEDESCRIPTION OF A PREFERRED EMBODIMENT

En référence aux figures 1 et 2, l'échangeur de chaleur 1 est composé d'une carcasse 2 dont l'intérieur contient un faisceau de conduits parallèles (non représentés), destinés au passage des gaz à refroidir. Un fluide de refroidissement circule dans la carcasse 2, à l'extérieur des conduits.With reference to Figures 1 and 2 , the heat exchanger 1 is composed of a carcass 2 whose inside contains a bundle of parallel ducts (not shown) for the passage of the gases to be cooled. A cooling fluid circulates in the carcass 2, outside the ducts.

Dans cet exemple, la carcasse 2 possède une section sensiblement rectangulaire et est fermée à une de ses extrémités pour recevoir le faisceau de conduits qui, dans ce cas, est du type en "U", autrement dit l'entrée et la sortie desdits conduits sont situées du même côté à l'extrémité libre de la carcasse 2.In this example, the carcass 2 has a substantially rectangular section and is closed to one of its ends to receive the bundle of ducts which, in this case, is of the "U" type, in other words the inlet and the outlet of said ducts are situated on the same side at the free end of the carcass 2.

L'échangeur 1 incorpore également des moyens de raccord 3 à un conduit de la ligne de recirculation des gaz (non représenté), et un conduit de dérivation 6 intégré auxdits moyens de raccord 3, destiné à faire circuler le fluide de refroidissement jusqu'à une soupape EGR (non représentée) qui régule le passage des gaz à travers l'échangeur 1.The exchanger 1 also incorporates connection means 3 to a conduit of the gas recirculation line (not shown), and a bypass duct 6 integrated with said connection means 3, for circulating the cooling fluid to an EGR valve (not shown) which regulates the passage of gases through the exchanger 1.

Selon une réalisation de l'invention, comme l'illustrent les figures 1 et 2, lesdits moyens de raccord 3 comprennent deux rebords périphériques 4,5 fabriqués par estampage. Le premier rebord périphérique 4 est raccordé à la ligne de recirculation et à la soupape EGR, et le deuxième rebord périphérique 5 comprend ledit conduit de dérivation 6 estampé, les deux rebords 4,5 étant joints entre eux par soudure.According to one embodiment of the invention, as illustrated by Figures 1 and 2 said coupling means 3 comprise two peripheral flanges 4,5 produced by stamping. The first peripheral flange 4 is connected to the recirculation line and the EGR valve, and the second peripheral flange 5 comprises said branch duct 6 stamped, the two flanges 4,5 being joined together by welding.

Le premier rebord 4 a pour fonction de raccorder la carcasse 2 à la ligne de recirculation et à la soupape EGR, en assurant une étanchéité adéquate. Sa résistance mécanique est assurée par sa conception estampée présentant une forme et une grosseur adaptées.The first flange 4 serves to connect the carcass 2 to the recirculation line and the EGR valve, ensuring adequate sealing. Its mechanical strength is ensured by its embossed design having a shape and a size adapted.

Une fois soudé au premier rebord 4, le deuxième rebord 5 permet de créer les parois dudit conduit de dérivation 6. La surface dudit deuxième rebord 5 peut recouvrir complètement la surface du premier rebord 4 (voir figures 1 et 2), ou, selon une autre réalisation, uniquement une partie de celle-ci, de façon à économiser le matériau (voir figure 3).Once welded to the first edge 4, the second edge 5 makes it possible to create the walls of said bypass duct 6. The surface of said second flange 5 can completely cover the surface of the first flange 4 (see FIG. Figures 1 and 2 ), or, in another embodiment, only a part thereof, so as to save the material (see figure 3 ).

Les deux rebords 4,5 estampés sont fabriqués en acier inoxydable, ou peuvent être fabriqués en un autre matériau quelconque susceptible d'en réduire le poids et les coûts de fabrication.The two stamped flanges 4.5 are made of stainless steel, or may be made of any other material that may reduce weight and manufacturing costs.

Le deuxième rebord 5 incorpore par ailleurs un tronçon tubulaire 7 de faible longueur permettant de l'assembler directement à la carcasse 2, par exemple par soudure.The second rim 5 also incorporates a tubular section 7 of short length to be assembled directly to the carcass 2, for example by welding.

L'orifice d'entrée 8 du conduit de dérivation 6 est ménagé dans ledit tronçon tubulaire 7 et raccordé à un orifice correspondant 9 de la carcasse 2.The inlet orifice 8 of the bypass duct 6 is formed in said tubular section 7 and connected to a corresponding orifice 9 of the carcass 2.

Les deux rebords 4,5 incorporent de la même manière un orifice d'entrée 10 de fluide de refroidissement depuis le conduit de dérivation 6 jusqu'à la soupape EGR, et un orifice de sortie 11 du fluide de refroidissement depuis la soupape EGR jusqu'au circuit de refroidissement.The two flanges 4,5 likewise incorporate a coolant inlet 10 from the bypass duct 6 to the EGR valve, and an outlet 11 of the coolant from the EGR valve to the cooling circuit.

Les moyens de raccord 3 comprennent également un conduit 12 de guidage du fluide de refroidissement, à travers l'orifice de sortie 11, depuis la soupape EGR jusqu'au circuit de refroidissement (voir figure 3).The coupling means 3 also comprise a conduit 12 for guiding the cooling fluid, through the outlet orifice 11, from the EGR valve to the cooling circuit (see FIG. figure 3 ).

Les deux rebords périphériques 4,5 incorporent en outre des orifices 13 destinés à recevoir des éléments de visserie permettant de les fixer au conduit de la ligne de recirculation des gaz.The two peripheral rims 4,5 also incorporate orifices 13 intended to receive hardware elements making it possible to fix them to the duct of the gas recirculation line.

La dérivation vers la soupape EGR s'effectue de la manière suivante:

  • En premier lieu, le fluide de refroidissement circulant dans la carcasse 2 de l'échangeur 1 passe à travers l'orifice 9 en pénétrant dans le conduit de dérivation 6 intégré aux deux rebords 4,5 qui le guide jusqu'à la soupape EGR.
The derivation to the EGR valve is as follows:
  • Firstly, the cooling fluid circulating in the carcass 2 of the exchanger 1 passes through the orifice 9 by entering the bypass duct 6 integrated in the two flanges 4,5 which guides it to the EGR valve.

Une fois qu'il a traversé la soupape EGR, le fluide de refroidissement est renvoyé au circuit de refroidissement à travers l'orifice de sortie 11 des rebords 4,5, en étant guidé par le conduit correspondant 12 du circuit de refroidissement.Once it has passed through the EGR valve, the coolant is returned to the cooling circuit through the outlet orifice 11 of the flanges 4,5, being guided by the corresponding conduit 12 of the cooling circuit.

Claims (8)

  1. Heat exchanger (1) for gas, notably for the exhaust gases of an engine, comprising a plurality of parallel pipes arranged inside a carcase (2), and through which the gases to be cooled by exchange of heat with a coolant flow; means (3) of connection to a pipe of the gas recirculation line; and a branch pipe (6) incorporated into said connecting means (3) and intended to cause the coolant to flow to an EGR valve which regulates the passage of gas through the exchanger; characterized in that said connecting means (3) incorporated into said branch pipe (6) comprise at least two components (4, 5) produced by stamping.
  2. Exchanger (1) according to Claim 1, characterized in that said at least two stamped components (4, 5) of the connecting means (3) are joined together by welding.
  3. Exchanger (1) according to Claim 1 or 2, characterized in that the connecting means (3) incorporated into said branch pipe (6) comprise a first peripheral rim (4) connected to the recirculation line and to the EGR valve, and a second rim (5) comprising said stamped branch pipe (6), the two rims (4, 5) being joined together.
  4. Exchanger (1) according to Claim 3, characterized in that the surface of the second rim (5) completely or partially covers the surface of the first rim (4).
  5. Exchanger (1) according to either one of Claims 3 and 4, characterized in that the second rim (5) incorporates a short tubular section (7) that allows it to be assembled directly with the carcase (2).
  6. Exchanger (1) according to Claim 5, characterized in that an inlet orifice (8) of the branch pipe (6) is formed in said tubular section (7) and connected to a corresponding orifice (9) belonging to the carcase (2).
  7. Exchanger (1) according to any one of Claims 3 to 6, characterized in that the two rims (4, 5) incorporate an inlet orifice (10) for admitting coolant from the branch pipe (6) as far as the EGR valve, and an outlet orifice (11) for letting coolant out from the EGR valve as far as the cooling circuit.
  8. Exchanger (1) according to any one of the preceding claims, characterized in that the connecting means (3) also comprise a pipe (12) that guides the coolant from the EGR valve to the cooling circuit.
EP07120252A 2006-11-17 2007-11-08 Heat exchanger for gas, in particular for the exhaust gas of an engine Active EP1925899B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES200602935A ES2304092B1 (en) 2006-11-17 2006-11-17 HEAT EXCHANGER FOR GASES, ESPECIALLY OF EXHAUST GASES OF AN ENGINE.

Publications (3)

Publication Number Publication Date
EP1925899A2 EP1925899A2 (en) 2008-05-28
EP1925899A3 EP1925899A3 (en) 2010-11-17
EP1925899B1 true EP1925899B1 (en) 2011-11-30

Family

ID=39145431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07120252A Active EP1925899B1 (en) 2006-11-17 2007-11-08 Heat exchanger for gas, in particular for the exhaust gas of an engine

Country Status (3)

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EP (1) EP1925899B1 (en)
AT (1) ATE535770T1 (en)
ES (2) ES2304092B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2399036B1 (en) * 2010-06-28 2014-01-28 Valeo Térmico, S.A. HEAT EXCHANGER FOR GASES IN SPECIAL EXHAUST GASES OF A MOTOR.
DE102011080828A1 (en) * 2011-08-11 2013-02-14 Mahle International Gmbh Plate heat exchanger
FR2993968B1 (en) * 2012-07-24 2018-07-27 Valeo Systemes Thermiques COLLECTOR FOR HEAT EXCHANGER AND HEAT EXCHANGER COMPRISING SUCH A MANIFOLD

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU90761B1 (en) * 2001-04-20 2002-10-21 Delphi Tech Inc Device for exhaust gas recirculation
DE10217626A1 (en) * 2002-04-20 2003-10-30 Wahler Gmbh & Co Kg Gustav Device for recycling the exhaust gas of an internal combustion engine
WO2003098026A1 (en) * 2002-05-15 2003-11-27 Behr Gmbh & Co. Kg Switchable waste gas exchanger
ES2199060B1 (en) * 2002-05-30 2004-11-16 Valeo Termico, S.A. HEAT EXCHANGER FOR GASES.
US7013565B1 (en) * 2003-08-20 2006-03-21 Zelinski Joseph R Removable collector for liquid cooled exhaust
US7108054B2 (en) * 2003-09-11 2006-09-19 Honeywell International, Inc. Heat exchanger
DE10359054A1 (en) * 2003-12-17 2005-07-21 Daimlerchrysler Ag Flange for exhaust manifold of motor vehicle, has metal sheet shaped part that is manufactured by reverse stamping technique, and fastening units connected to openings provided on either sides of central opening of metal sheet part
DE10359806A1 (en) * 2003-12-19 2005-07-14 Modine Manufacturing Co., Racine Heat exchanger with flat tubes and flat heat exchanger tube
DE102004019554C5 (en) * 2004-04-22 2014-03-27 Pierburg Gmbh Exhaust gas recirculation system for an internal combustion engine
US7661415B2 (en) * 2004-09-28 2010-02-16 T.Rad Co., Ltd. EGR cooler
ES2296514B1 (en) * 2006-04-05 2009-03-16 Valeo Termico, S.A. HEAT EXCHANGER FOR GASES, ESPECIALLY OF EXHAUST GASES OF AN ENGINE.

Also Published As

Publication number Publication date
ATE535770T1 (en) 2011-12-15
EP1925899A2 (en) 2008-05-28
EP1925899A3 (en) 2010-11-17
ES2304092A1 (en) 2008-09-01
ES2304092B1 (en) 2009-07-03
ES2377950T3 (en) 2012-04-03

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