EP2232184A1 - Heat exchanger for gases, in particular the exhaust gases of an engine - Google Patents

Heat exchanger for gases, in particular the exhaust gases of an engine

Info

Publication number
EP2232184A1
EP2232184A1 EP08860155A EP08860155A EP2232184A1 EP 2232184 A1 EP2232184 A1 EP 2232184A1 EP 08860155 A EP08860155 A EP 08860155A EP 08860155 A EP08860155 A EP 08860155A EP 2232184 A1 EP2232184 A1 EP 2232184A1
Authority
EP
European Patent Office
Prior art keywords
exchanger
metal
circuit
seal
gases
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08860155A
Other languages
German (de)
French (fr)
Inventor
Yolanda Bravo Rodriguez
Marta Ramos Romero
Eva Tomas Herrero
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Termico SA
Original Assignee
Valeo Termico SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Termico SA filed Critical Valeo Termico SA
Publication of EP2232184A1 publication Critical patent/EP2232184A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
    • F28D7/1692—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section with particular pattern of flow of the heat exchange media, e.g. change of flow direction
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2270/00—Thermal insulation; Thermal decoupling

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 the exhaust gas recirculation exchangers of an engine (EGRC).
  • a well-established practice in the automotive field is to use an exhaust gas recirculation system of a diesel engine or an internal combustion engine, known as EGR or "Exhaust Gas Recycling”. , in order to mix these gases with the intake air since the presence of the exhaust gases in the mixture reduces the formation of nitrogen oxides (NOx).
  • EGR exhaust gas recirculation system of a diesel engine or an internal combustion engine
  • 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 comprises a valve (EGR valve) regulating the passage of exhaust gas therethrough.
  • EGR valve regulating the passage of exhaust gas 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 parallel tubes for the passage of gases, the refrigerant circulating in the carcass to the 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 refrigerant circulate between two plates in alternating layers.
  • the carcass is joined to the recirculation line conduits by coupling 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 the assembly of the exchanger takes place.
  • peripheral flange In the case of a connecting peripheral flange or a flange, two different designs are possible.
  • the peripheral flange can be mounted together with a gas tank, the gas tank then constituting an intermediate piece between the carcass and the flange.
  • the rim can also be mounted directly on the carcass. This latter design is often the case where the heat exchanger is attached directly to an EGR valve. In some EGR applications, it is necessary to cool the EGR valve.
  • the most common design incorporates a bypass duct conveying refrigerant fluid, flowing through the EGR exchanger, to or from the EGR valve. If the EGR exchanger is mounted on the EGR circuit by a peripheral rim, it is therefore necessary to manufacture the refrigerant bypass duct incorporating it to said peripheral rim.
  • the bypass duct is external and connects the carcass to the valve.
  • the gas circuit may also be of the linear type, wherein the gas inlet and outlet are disposed at opposite ends; or it may be of the U-shaped type, in which the gas inlet and outlet occupy adjacent positions at a same open end, the opposite end being closed, and defining a go and a return passage.
  • the closed end for the return of gases is generally constituted by a closed gas tank.
  • EGR heat exchangers are commonly made of metal and usually made of stainless steel or aluminum. All components of the ductwork heat exchangers, such as the stacked plate heat exchangers, are metallic, so that the heat exchangers are assembled by mechanical means and then welded in the oven or arc or laser to ensure an adequate level of sealing for this application.
  • EGR heat exchanger One way to reduce the cost of the EGR heat exchanger is to replace the stainless steel casing with another material, provided that it is less expensive and allows other functions such as incorporation to be incorporated. coolant conduits or mounting brackets to a surface of the engine environment which will serve to fix the exchanger.
  • Duct beam heat exchangers comprising a plastic carcass are known.
  • the plastic casings have the advantage of reducing the cost of the final product in that they allow the integration of the refrigerant circuit conduits and the attachment brackets to a surface of the engine environment.
  • This type of interchange includes generally a metal flange attached to the support plate and in direct contact with the plastic casing, the EGR or bypass valve being directly mounted on this flange or indirectly via an intermediate coupling body.
  • the high temperature can thus be transferred from the walls of the valve or the intermediate coupling body to the flange and therefore to the plastic.
  • a seal is placed between the metal flange and the valve or the intermediate coupling body.
  • This seal is generally metallic, for example steel, for EGRC applications.
  • This metal seal also having a high thermal conductivity, it does not cause a reduction in the heat transfer of the material in contact with the gas.
  • the subject of the present invention is a heat exchanger for gases, in particular for the exhaust gases of an engine, designed to overcome the drawbacks of heat exchangers known in the art by offering thermal insulation means making it possible to reduce the level of temperature at at least one end of the circuit to which is fixed the metal support plate, thus ensuring the durability of the exchanger.
  • the gas heat exchanger in particular for the exhaust gases of an engine, which is the subject of the present invention is of the type comprising a metal circuit intended for the circulation of gases with heat exchange with a refrigerant fluid, arranged at the inside a plastic casing, a metal support plate coupled to at least one end of said circuit, a metal flange joined to said metal support plate and coupled in direct contact with the plastic casing, and characterized in that it incorporates means thermal insulation of said at least one end of said circuit to which is fixed the metal support plate.
  • the thermal insulation means of the invention make it possible to reduce the temperature level, thereby guaranteeing the durability of the EGR exchanger, and, more importantly, allow the choice of plastics that can be expanded to be increased. 'be used for the carcass. The manufacturing cost is thus reduced.
  • an EGR or bypass valve is mounted directly on said metal flange or via an intermediate coupling body.
  • the intermediate connector body is an optional component and may have different configurations depending on the motor environment.
  • the thermal insulation means preferably consist of a seal disposed between said metal flange and said valve or said intermediate coupling body.
  • the seal is advantageously made of a heat insulating material, thereby reducing the heat transfer from the valve or the intermediate coupling body to the plastic casing.
  • the seal is preferably made of mica. This material is able to withstand high temperatures.
  • the gasket is advantageously capable of withstanding high temperatures which can to reach 950 fl C approximately, thus allowing a significant reduction of the temperature in contact with the plastic carcass.
  • Figure 1 is an exploded perspective view of a gas heat exchanger of the invention.
  • Figure 2 is an elevational view of the seal of thermal insulating material of the invention.
  • the heat exchanger 1 consists of a plastic casing 2 containing inside a bundle of parallel ducts 3 intended for the passage of the gases to be cooled.
  • a refrigerant circulates from an inlet 4 to an outlet 5.
  • the carcass 2 has a substantially rectangular section and is closed at one end. its ends to allow to accommodate the bundle of ducts 3 which is, in this case, of the type in the form of "U", in other words the inlet 6 and the outlet 7 of said ducts 3 are arranged on the same side at the end open of the carcass 2, defining a go and a return passage of the gases to be cooled.
  • the duct bundle 3 is fixed, by its free end, to a metal support plate 8, which has a plurality of orifices in which the respective ducts 3 are housed and, by its closed end, to a metal gas tank 9.
  • Said support plate 8 is joined to a metal flange 10, which is coupled in direct contact with the open end of the plastic casing 2 by means of hardware and by means of a plastic seal 11 ensuring the tightness of the refrigerant.
  • seal 12 disposed between the metal flange 10 and the valve.
  • Said seal 12 is made of a thermal insulating material, preferably mica, so as to reduce the heat transfer from the valve to the plastic casing 2.
  • Said seal 12 also has a shape matching that of the rim 10, as shown in Figure 2.
  • the seal 12 is able to withstand high temperatures of up to about 950 2 C, thus allowing a substantial reduction of the temperature in contact with the plastic carcass 2 to about 50 2 C.
  • the invention can however also find application in stacked plate heat exchangers.
  • the gas circuit can also be of the U-shaped type (the inlet and the gas outlet being disposed at the same end) or linear type (the inlet and the outlet of the gas being disposed at opposite ends).

Landscapes

  • 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)

Abstract

The heat exchanger of the present invention includes a metal circuit (3) for gas circulation with heat exchange with a coolant and provided inside a plastic frame (2), a metal carrier plate (8) coupled to at least one end of said circuit (3), a metal ledge (10) connected to said metal carrier plate (8) and coupled in direct contact with the plastic frame (2). The heat exchanger is characterised in that it comprises a means for the thermal insulation of said at least one end of the circuit (3), to which the metal carrier plate (8) is attached. It is possible to reduce the temperature level at at least one end of the circuit while thereby guaranteeing the exchanger durability and broadening the selection of plastic materials that can be used for the frame.

Description

BREVET D'INVENTION PATENT
ECHANGEUR DE CHALEUR POUR GAZ, NOTAMMENT POUR LES GAZ D'ÉCHAPPEMENTHEAT EXCHANGER FOR GASES, IN PARTICULAR FOR EXHAUST GASES
D'UN MOTEUR OF AN ENGINE
ÉCHANGEUR DE CHALEUR POUR GAZ, NOTAMMENT POUR LES GAZ D'ÉCHAPPEMENT D'UN MOTEURHEAT EXCHANGER FOR GASES, ESPECIALLY FOR EXHAUST GASES FROM AN ENGINE
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 (EGRC) .The invention is particularly applicable to the exhaust gas recirculation exchangers of an engine (EGRC).
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 ou d'un moteur à combustion interne, 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 an exhaust gas recirculation system of a diesel engine or an internal combustion engine, known as EGR or "Exhaust Gas Recycling". , in order to mix these gases with the intake air since the presence of the exhaust gases 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 gas d'échappement à travers celui-ci.The system loop further comprises a valve (EGR valve) regulating the passage of exhaust gas 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 réfrigérant circulant dans la carcasse à l'extérieur des tubes ; dans un autre mode de 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 réfrigérant circulent entre deux plaques, en couches alternées. 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 bien d'un rebord périphérique ou d'une bride, en fonction de la conception de la ligne de recirculation où s'effectue l'assemblage de l ' échangeur .The heat exchanger itself can have several different configurations: it can, for example, include a tubular carcass inside which are arranged a series of parallel tubes for the passage of gases, the refrigerant circulating in the carcass to the 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 refrigerant circulate between two plates in alternating layers. The carcass is joined to the recirculation line conduits by coupling 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 the assembly of the exchanger takes place.
Dans le cas d'un rebord périphérique de raccord ou d'une bride, deux conceptions différentes sont possibles. Le rebord périphérique peut être monté 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 monté directement sur la carcasse. Cette dernière conception correspond souvent aux cas où l' échangeur est joint directement à une soupape EGR. 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 réfrigérant, circulant à travers l' échangeur EGR, jusqu'à ou à partir de la soupape EGR. Si l' échangeur EGR est monté sur le circuit EGR par un rebord périphérique, il est donc nécessaire de fabriquer le conduit de dérivation du fluide réfrigérant en l'incorporant audit rebord périphérique. Selon un autre mode de réalisation, le conduit de dérivation est externe et raccorde la carcasse à la soupape.In the case of a connecting peripheral flange or a flange, two different designs are possible. The peripheral flange can be mounted together with a gas tank, the gas tank then constituting an intermediate piece between the carcass and the flange. The rim can also be mounted directly on the carcass. This latter design is often the case where the heat exchanger is attached directly to an EGR valve. In some EGR applications, it is necessary to cool the EGR valve. In this case, the most common design incorporates a bypass duct conveying refrigerant fluid, flowing through the EGR exchanger, to or from the EGR valve. If the EGR exchanger is mounted on the EGR circuit by a peripheral rim, it is therefore necessary to manufacture the refrigerant bypass duct incorporating it to said peripheral rim. According to another embodiment, the bypass duct is external and connects the carcass to the valve.
Le circuit des gaz peut également être du type linéaire, dans lequel l'entrée et la sortie des gaz sont disposées à des extrémités opposées ; ou bien il peut être du type en forme de "U", dans lequel l'entrée et la sortie des gaz occupent des positions adjacentes au niveau d'une même extrémité ouverte, l'extrémité opposée étant fermée, et définissant un passage aller et un passage retour. Dans ce dernier cas, l'extrémité fermée pour le retour des gaz est généralement constituée d'un réservoir de gaz fermé. Les échangeurs de chaleur EGR sont couramment métalliques et généralement fabriqués en acier inoxydable ou en aluminium. Tous les composants des échangeurs à faisceau de conduits comme ceux des échangeurs à plaques empilées sont métalliques, de sorte que les échangeurs sont assemblés par des moyens mécaniques puis soudés au four ou à l'arc ou au laser pour assurer un niveau d'étanchéité adéquat pour cette application.The gas circuit may also be of the linear type, wherein the gas inlet and outlet are disposed at opposite ends; or it may be of the U-shaped type, in which the gas inlet and outlet occupy adjacent positions at a same open end, the opposite end being closed, and defining a go and a return passage. In the latter case, the closed end for the return of gases is generally constituted by a closed gas tank. EGR heat exchangers are commonly made of metal and usually made of stainless steel or aluminum. All components of the ductwork heat exchangers, such as the stacked plate heat exchangers, are metallic, so that the heat exchangers are assembled by mechanical means and then welded in the oven or arc or laser to ensure an adequate level of sealing for this application.
Un moyen de réduire le coût de l'échangeur de chaleur EGR consiste à remplacer la carcasse d'acier inoxydable par un autre matériau, à condition que celui-ci soit moins coûteux et permette d'intégrer d'autres fonctions telles que l'incorporation des conduits du fluide réfrigérant ou des supports de fixation à une surface de l ' environnement moteur qui servira à fixer 1 ' échangeur .One way to reduce the cost of the EGR heat exchanger is to replace the stainless steel casing with another material, provided that it is less expensive and allows other functions such as incorporation to be incorporated. coolant conduits or mounting brackets to a surface of the engine environment which will serve to fix the exchanger.
On connaît des échangeurs de chaleur à faisceau de conduits comprenant une carcasse en matière plastique. Les carcasses en plastique offrent l'avantage de réduire le coût du produit final dans la mesure où elles permettent l'intégration des conduits du circuit du fluide réfrigérant et des supports de fixation à une surface de 1 ' environnement moteur .Duct beam heat exchangers comprising a plastic carcass are known. The plastic casings have the advantage of reducing the cost of the final product in that they allow the integration of the refrigerant circuit conduits and the attachment brackets to a surface of the engine environment.
On connaît des brevets ayant pour objet des échangeurs EGR à carcasse en plastique qui décrivent la jonction entre les parties métalliques et en plastique, en assurant l'étanchéité du fluide réfrigérant pour éviter toute fuite.There are known patents for EGR exchangers with plastic carcass that describe the junction between the metal parts and plastic, sealing the refrigerant to prevent leakage.
L'un des principaux aspects de ce développement réside dans la température maximale à laquelle le plastique doit résister. Ce type d' échangeurs comprend généralement un rebord métallique joint à la plaque de support et au contact direct de la carcasse en plastique, la soupape EGR ou de dérivation pouvant être directement montée sur ce rebord ou indirectement par le biais d'un corps de raccord intermédiaire. La température élevée peut ainsi être transférée des parois de la soupape ou du corps de raccord intermédiaire au rebord et donc au plastique. Ceci nécessite d'utiliser pour la carcasse une matière plastique résistant aux hautes températures, ce qui limite le choix des plastiques susceptibles d'être utilisés et occasionne en outre une augmentation sensible du coût.One of the main aspects of this development is the maximum temperature at which the plastic must withstand. This type of interchange includes generally a metal flange attached to the support plate and in direct contact with the plastic casing, the EGR or bypass valve being directly mounted on this flange or indirectly via an intermediate coupling body. The high temperature can thus be transferred from the walls of the valve or the intermediate coupling body to the flange and therefore to the plastic. This requires the use of a plastic material resistant to high temperatures for the carcass, which limits the choice of plastics that can be used and also causes a significant increase in cost.
Dans le but d'assurer l'étanchéité du flux de gaz entre la soupape et l'échangeur, on place un joint d'étanchéité entre le rebord métallique et la soupape ou le corps de raccord intermédiaire. Ce joint est généralement métallique, par exemple en acier, pour les applications EGRC. Ce joint métallique présentant en outre une grande conductivité thermique, il n'occasionne pas de réduction du transfert de chaleur du matériau au contact du gaz.In order to seal the flow of gas between the valve and the exchanger, a seal is placed between the metal flange and the valve or the intermediate coupling body. This seal is generally metallic, for example steel, for EGRC applications. This metal seal also having a high thermal conductivity, it does not cause a reduction in the heat transfer of the material in contact with the gas.
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, conçu pour remédier aux inconvénients des échangeurs connus dans la technique en offrant des moyens d'isolation thermique permettant de réduire le niveau de température à au moins une des extrémités du circuit auquel est fixée la plaque de support métallique, en garantissant ainsi la durabilité de l'échangeur.The subject of the present invention is a heat exchanger for gases, in particular for the exhaust gases of an engine, designed to overcome the drawbacks of heat exchangers known in the art by offering thermal insulation means making it possible to reduce the level of temperature at at least one end of the circuit to which is fixed the metal support plate, thus ensuring the durability of the exchanger.
L'échangeur de chaleur pour gaz, notamment pour les gaz d'échappement d'un moteur, objet de la présente invention est du type comprenant un circuit métallique destiné à la circulation des gaz avec échange de chaleur avec un fluide réfrigérant, disposé à l'intérieur d'une carcasse en plastique, une plaque de support métallique couplée à au moins une des extrémités dudit circuit, un rebord métallique joint à ladite plaque de support métallique et couplé en contact direct avec la carcasse en plastique, et caractérisé en ce qu'il incorpore des moyens d'isolation thermique de ladite au moins une des extrémités dudit circuit à laquelle est fixée la plaque de support métallique.The gas heat exchanger, in particular for the exhaust gases of an engine, which is the subject of the present invention is of the type comprising a metal circuit intended for the circulation of gases with heat exchange with a refrigerant fluid, arranged at the inside a plastic casing, a metal support plate coupled to at least one end of said circuit, a metal flange joined to said metal support plate and coupled in direct contact with the plastic casing, and characterized in that it incorporates means thermal insulation of said at least one end of said circuit to which is fixed the metal support plate.
De cette manière, les moyens d'isolation thermique de l'invention permettent de diminuer le niveau de température, en garantissant ainsi la durabilité de l'échangeur EGR, et, plus important encore, permettent d'élargir le choix de matières plastiques susceptibles d'être utilisées pour la carcasse. Le coût de fabrication s'en voit ainsi réduit.In this way, the thermal insulation means of the invention make it possible to reduce the temperature level, thereby guaranteeing the durability of the EGR exchanger, and, more importantly, allow the choice of plastics that can be expanded to be increased. 'be used for the carcass. The manufacturing cost is thus reduced.
Selon un mode de réalisation de l'invention, une soupape EGR ou de dérivation est montée directement sur ledit rebord métallique ou par le biais d'un corps de raccord intermédiaire . Ledit corps de raccord intermédiaire est un composant facultatif et peut présenter différentes configurations en fonction de l'environnement moteur.According to one embodiment of the invention, an EGR or bypass valve is mounted directly on said metal flange or via an intermediate coupling body. The intermediate connector body is an optional component and may have different configurations depending on the motor environment.
Les moyens d'isolation thermique consistent de préférence en un joint d'étanchéité disposé entre ledit rebord métallique et ladite soupape ou ledit corps de raccord intermédiaire .The thermal insulation means preferably consist of a seal disposed between said metal flange and said valve or said intermediate coupling body.
Le joint d'étanchéité est avantageusement constitué d'un matériau d'isolation thermique, réduisant ainsi le transfert de chaleur de la soupape ou du corps de raccord intermédiaire à la carcasse en plastique.The seal is advantageously made of a heat insulating material, thereby reducing the heat transfer from the valve or the intermediate coupling body to the plastic casing.
Le joint d'étanchéité est de préférence constitué de mica. Ce matériau est capable de résister à de hautes températures .The seal is preferably made of mica. This material is able to withstand high temperatures.
Le joint d'étanchéité est avantageusement susceptible de résister à de hautes températures pouvant atteindre 950 flC environ, en permettant ainsi une réduction sensible de la température au contact de la carcasse en plastique.The gasket is advantageously capable of withstanding high temperatures which can to reach 950 fl C approximately, thus allowing a significant reduction of the temperature in contact with the plastic carcass.
Les avantages associés à l'utilisation de ce type de joints ont été évalués par des essais et des simulations .The advantages associated with the use of this type of joints have been evaluated by tests and simulations.
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 mode de réalisation pratique de l'échangeur de chaleur pour gaz de l'invention. Dans ces dessins :In order to facilitate the description of what has been explained above, drawings are enclosed in which is shown schematically and only by way of non-limiting example, a practical embodiment of the gas heat exchanger. of the invention. In these drawings:
La figure 1 est une vue en perspective et éclatée d'un échangeur de chaleur pour gaz de l'invention ; etFigure 1 is an exploded perspective view of a gas heat exchanger of the invention; and
La figure 2 est une vue en élévation du joint d'étanchéité en matériau isolant thermique de l'invention.Figure 2 is an elevational view of the seal of thermal insulating material of the invention.
DESCRIPTION D'UN MODE DE RÉALISATION PRÉFÉRÉDESCRIPTION OF A PREFERRED EMBODIMENT
En référence aux figures 1 et 2, l'échangeur de chaleur 1 est constitué d'une carcasse en plastique 2 contenant à l'intérieur un faisceau de conduits parallèles 3, destinés au passage des gaz à refroidir. A l'intérieur de la carcasse 2 et à l'extérieur des conduits 3, un fluide réfrigérant circule d'une entrée 4 à une sortie 5. Dans cet exemple, la carcasse 2 présente une section sensiblement rectangulaire et est fermée à l'une de ses extrémités pour permettre d'y loger le faisceau de conduits 3 qui est, dans ce cas, du type en forme de "U", autrement dit l'entrée 6 et la sortie 7 desdits conduits 3 sont disposées d'un même côté au niveau de l'extrémité ouverte de la carcasse 2, en définissant un passage aller et un passage retour des gaz à refroidir.With reference to FIGS. 1 and 2, the heat exchanger 1 consists of a plastic casing 2 containing inside a bundle of parallel ducts 3 intended for the passage of the gases to be cooled. Inside the carcass 2 and outside the conduits 3, a refrigerant circulates from an inlet 4 to an outlet 5. In this example, the carcass 2 has a substantially rectangular section and is closed at one end. its ends to allow to accommodate the bundle of ducts 3 which is, in this case, of the type in the form of "U", in other words the inlet 6 and the outlet 7 of said ducts 3 are arranged on the same side at the end open of the carcass 2, defining a go and a return passage of the gases to be cooled.
Le faisceau de conduits 3 est fixé, par son extrémité libre, à une plaque de support métallique 8, laquelle présente une pluralité d'orifices dans lesquels viennent se loger les conduits 3 respectifs et, par son extrémité fermée, à un réservoir de gaz métallique 9.The duct bundle 3 is fixed, by its free end, to a metal support plate 8, which has a plurality of orifices in which the respective ducts 3 are housed and, by its closed end, to a metal gas tank 9.
Ladite plaque de support 8 est jointe à un rebord métallique 10, lequel est couplé en contact direct avec l'extrémité ouverte de la carcasse en plastique 2 par de la visserie et par le biais d'un joint en plastique 11 assurant l'étanchéité du fluide réfrigérant.Said support plate 8 is joined to a metal flange 10, which is coupled in direct contact with the open end of the plastic casing 2 by means of hardware and by means of a plastic seal 11 ensuring the tightness of the refrigerant.
Il est également prévu de monter une soupape EGR ou de dérivation {non illustrée) sur le rebord métallique 10.It is also intended to mount an EGR or bypass valve (not shown) on the metal flange 10.
Par ailleurs, dans le but de garantir l'étanchéité du flux de gaz entre la soupape et l'échangeur 1, il est prévu un joint d'étanchéité 12 disposé entre le rebord métallique 10 et la soupape. Ledit joint d'étanchéité 12 est constitué d'un matériau isolant thermique, de préférence de mica, de manière à réduire le transfert de chaleur de la soupape à la carcasse en plastique 2. Ledit joint d'étanchéité 12 présente également une forme épousant celle du rebord 10, comme le montre la figure 2.Furthermore, in order to ensure the tightness of the gas flow between the valve and the exchanger 1, there is provided a seal 12 disposed between the metal flange 10 and the valve. Said seal 12 is made of a thermal insulating material, preferably mica, so as to reduce the heat transfer from the valve to the plastic casing 2. Said seal 12 also has a shape matching that of the rim 10, as shown in Figure 2.
Le joint d'étanchéité 12 est susceptible de résister à de hautes températures pouvant atteindre 950 2C environ, en permettant ainsi une réduction sensible de la température au contact de la carcasse en plastique 2 à hauteur d'environ 50 2C.The seal 12 is able to withstand high temperatures of up to about 950 2 C, thus allowing a substantial reduction of the temperature in contact with the plastic carcass 2 to about 50 2 C.
Si cet exemple a décrit un échangeur à faisceau de tubes parallèles, l'invention peut toutefois également trouver une application dans les échangeurs à plaques empilées. Dans les deux cas, le circuit de gaz peut également être du type en forme de "U" (l'entrée et la sortie des gaz étant disposées à une même extrémité) ou du type linéaire (l'entrée et la sortie des gaz étant disposées à des extrémités opposées) . If this example has described a parallel tube bundle exchanger, the invention can however also find application in stacked plate heat exchangers. In both cases, the gas circuit can also be of the U-shaped type (the inlet and the gas outlet being disposed at the same end) or linear type (the inlet and the outlet of the gas being disposed at opposite ends).

Claims

R E V E N D I C A T I O N S
1. Échangeur de chaleur ( 1 ) pour gaz , comprenant un circuit métallique (3) destiné à la circulation des gaz avec échange de chaleur avec un fluide réfrigérant, disposé à l'intérieur d'une carcasse en plastique (2), une plaque de support métallique (8) couplée à au moins une des extrémités dudit circuit {3), un rebord métalliqueHeat exchanger (1) for gas, comprising a metal circuit (3) for the circulation of gases with heat exchange with a refrigerant, arranged inside a plastic carcass (2), a plate metal support (8) coupled to at least one end of said circuit (3), a metal rim
(10) joint à ladite plaque de support métallique (8) et couplé en contact direct avec la carcasse en plastique(10) joined to said metal support plate (8) and coupled in direct contact with the plastic carcass
(2), caractérisé en ce qu'il incorpore des moyens d'isolation thermique (12) de ladite au moins une des extrémités dudit circuit (3) à laquelle est fixée la plaque de support métallique (8) .(2), characterized in that it incorporates thermal insulation means (12) of said at least one end of said circuit (3) to which is fixed the metal support plate (8).
2. Échangeur (1) selon la revendication 1, caractérisé en ce qu'une soupape EGR ou de dérivation est montée directement sur le bord métallique (10) ou par le biais d'un corps de raccord intermédiaire.2. Exchanger (1) according to claim 1, characterized in that an EGR valve or bypass is mounted directly on the metal edge (10) or through an intermediate connecting body.
3. Échangeur (1) selon la revendication 1 ou 2, caractérisé en ce que les moyens d'isolation thermique consistent en un joint d'étanchéité (12) disposé entre ledit rebord métallique (10) et ladite soupape ou ledit corps de raccord intermédiaire.3. Exchanger (1) according to claim 1 or 2, characterized in that the thermal insulation means consist of a seal (12) disposed between said metal rim (10) and said valve or said intermediate connecting body. .
4. Échangeur (1) selon la revendication 3, caractérisé en ce que le joint d'étanchéité (12) est constitué d'un matériau d'isolation thermique, réduisant ainsi le transfert de chaleur de la soupape ou du corps de raccord intermédiaire à la carcasse en plastique (2) .4. Exchanger (1) according to claim 3, characterized in that the seal (12) consists of a thermal insulation material, thereby reducing the heat transfer of the valve or the intermediate coupling body to the plastic carcass (2).
5. Échangeur (1) selon la revendication 4, caractérisé en ce que le joint d'étanchéité (12) est constitué de mica. 5. Exchanger (1) according to claim 4, characterized in that the seal (12) is made of mica.
6. Échangeur (1) selon l'une quelconque des revendications 3 à 5, caractérisé en ce que le joint d'étanchéité (12) est susceptible de résister à de hautes températures pouvant atteindre 950 ' 5C environ, en permettant ainsi une réduction sensible de la température au contact de la carcasse en plastique (2) . 6. Exchanger (1) according to any one of claims 3 to 5, characterized in that the seal (12) is capable of withstanding high temperatures of up to 950 '5 C, thereby allowing a reduction sensitive temperature in contact with the plastic carcass (2).
EP08860155A 2007-12-12 2008-11-26 Heat exchanger for gases, in particular the exhaust gases of an engine Withdrawn EP2232184A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200703278A ES2333191B1 (en) 2007-12-12 2007-12-12 HEAT EXCHANGER FOR GASES, ESPECIALLY OF EXHAUST GASES OF AN ENGINE.
PCT/EP2008/066194 WO2009074452A1 (en) 2007-12-12 2008-11-26 Heat exchanger for gases, in particular the exhaust gases of an engine

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EP2232184A1 true EP2232184A1 (en) 2010-09-29

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ES (1) ES2333191B1 (en)
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3512842A1 (en) * 1985-04-10 1986-10-16 Feodor Burgmann Dichtungswerke Gmbh & Co, 8190 Wolfratshausen POETRY

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20316688U1 (en) * 2003-10-29 2004-03-11 Behr Gmbh & Co. Kg heat exchangers
WO2007048603A2 (en) * 2005-10-26 2007-05-03 Behr Gmbh & Co. Kg Heat exchanger, method for the production of a heat exchanger
US20110056652A1 (en) * 2006-01-23 2011-03-10 Behr Gmbh & Co. Kg Heat exchanger
DE202006011446U1 (en) * 2006-07-26 2006-10-12 Carl Freudenberg Kg High temperature sealing of mica material, useful for sealing pipe connections in exhaust systems of combustion engines, comprises a coiled mica course material lying radially to one other, where the sealing is provided as a sealing ring

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3512842A1 (en) * 1985-04-10 1986-10-16 Feodor Burgmann Dichtungswerke Gmbh & Co, 8190 Wolfratshausen POETRY

Non-Patent Citations (1)

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Title
See also references of WO2009074452A1 *

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ES2333191A1 (en) 2010-02-17
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