EP2936038B1 - Flat tube for a charge air cooler and corresponding charge air cooler - Google Patents

Flat tube for a charge air cooler and corresponding charge air cooler Download PDF

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Publication number
EP2936038B1
EP2936038B1 EP13811212.3A EP13811212A EP2936038B1 EP 2936038 B1 EP2936038 B1 EP 2936038B1 EP 13811212 A EP13811212 A EP 13811212A EP 2936038 B1 EP2936038 B1 EP 2936038B1
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EP
European Patent Office
Prior art keywords
flat tube
fluid
charge air
insert
air cooler
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EP13811212.3A
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German (de)
French (fr)
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EP2936038A1 (en
Inventor
Nicolas Vallee
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Valeo Systemes Thermiques SAS
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Valeo Systemes Thermiques SAS
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Priority to PL13811212T priority Critical patent/PL2936038T3/en
Publication of EP2936038A1 publication Critical patent/EP2936038A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/045—Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly
    • F02B29/0462—Liquid cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/004—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using protective electric currents, voltages, cathodes, anodes, electric short-circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/08—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes pressed; stamped; deep-drawn

Definitions

  • the invention relates to the field of heat exchangers and charge air heat exchangers in the field of automobiles, in particular a flat tube of charge air heat exchanger according to the preamble of claim 1. .
  • WO 2009/156365 describes such a tube.
  • Each flat tube is generally formed of two plates of metal sheet stamped to form a bowl in a predefined pattern and arranged in such a way that their concavities are turned towards each other.
  • the two plates are then connected in a sealed manner, thus forming a flat tube in which the first fluid can flow from a fluid inlet to a fluid outlet, each located at one end of the flat tube and more generally each located on opposite sides. of the plate.
  • the flat tubes are stacked on each other, the fluid inlets of each flat tube being connected together to form an inlet column. Similarly, the fluid outlets of each flat tube are interconnected to form an output column. Between each flat tube is left a space for the passage of a second fluid. The exchange of heat between the two fluids thus occurring during the passage of the first fluid in the flat tubes and the second fluid between said flat tubes.
  • Such heat exchangers are commonly used as an evaporator in a refrigerant circuit for the air conditioning of the passenger compartment of a motor vehicle, this refrigerant constituting the first fluid and the second fluid being atmospheric air, or as a radiator. heating in a fluid circuit coolant for heating the passenger compartment of a motor vehicle, the heat transfer fluid constituting the first fluid and the second fluid being atmospheric air.
  • the use of a liquid as the first fluid has the disadvantage of reducing the resistance of the exchanger over time, because it is more likely to be damaged by corrosion.
  • one of the aims of the invention is to at least partially overcome the disadvantages of the prior art and to provide an improved supercharging air heat exchanger.
  • the present invention therefore relates to a flat tube of charge air heat exchanger made from at least one pressed metal sheet so as to form an exchange plate, said stamping allowing the connection between a fluid inlet and a fluid outlet by a circuit in which a coolant circulates, said circuit comprising at least one metal insert placed therein and made of a material creating a potential difference greater than or equal to 30mV with the material of the flat tube.
  • the flat tube is formed by the assembly of two exchange plates made from a stamped metal sheet and assembled to one another, the stamped sides of each plate of exchange facing each other.
  • the insert is made of metal alloy comprising 0.7 to 1.5% of zinc.
  • the at least one exchange plate is made of 3000 series aluminum alloy and the insert is made of aluminum alloy 6815 or 6807.
  • the invention also relates to a charge air heat exchanger comprising at least one flat tube as described above.
  • the exchange plate 1 for flat tube 100 of heat exchanger, shown in FIG. figure 1 can be made from a stamped metal sheet. It comprises a fluid inlet 3a and a fluid outlet 3b.
  • the stamping of the exchange plate 1 forms a cavity with ribs 7 defining a fluid flow circuit between the fluid inlet 3a and the fluid outlet 3b.
  • the ribs 7 give the flow path a flow path of a first heat transfer fluid between the fluid inlet 3a and the fluid outlet 3b.
  • This circulation path comprises at least two straight passes 5 connected by a curved portion 9.
  • This circulation path allows an increase in the length of the flow circuit and therefore increases the time during which the first heat transfer fluid flows within it. , thereby increasing the time when there can be heat transfer with a second fluid flowing on the opposite side of the exchange plate 1.
  • the ribs 7 may have rounded ends 11 .
  • the exchange plate 1 has four passes 5 parallel to each other and three curved portions 9 making the connection between said passes 5.
  • the at least one curved portion 9 may comprise projections 91.
  • These protrusions 91 may be made of material with the at least one exchange plate 1, for example by being made by stamping, or even be attached elements and fixed to within the at least one curved portion 9 by any means known to those skilled in the art.
  • the flat tubes 100 are generally constituted by the assembly of two exchange plates 1 between them, the passes 5 and curves 9 of the circuits and the ribs 7 of each of the two exchange plates 1 facing each other, forming the path of circulation of said flat tube 100.
  • the assembly of the exchange plates 1 is made to be sealed, for example by soldering, in order to prevent any leakage of the coolant passing through the flat tube 100.
  • Such flat tubes 100 are relatively thin for example their circulation path can have a height of 1mm to 3mm.
  • a flat tube 100 may be the assembly of an exchange plate 1 with a flat plate resting on the periphery of the exchange plate 1 and on the ribs 7, covering the circuit of FIG. flow.
  • the circuit comprises at least one insert 51 intended to disturb the circulation of the first heat transfer fluid and creating turbulence, as well as increasing the contact surface with the first heat transfer fluid and therefore increase exchanges between said first fluid and the flat tube 100.
  • the at least one insert 51 is made of a metallic material creating a potential difference greater than or equal to 30mV with the material of the flat tube 100. This potential difference allows said insert to be a sacrificial anode which is corroded preferentially instead. of the material of the flat tube 100, the latter in fact acquiring better resistance to corrosion over time.
  • said insert 51 is an effective sacrificial anode
  • said insert can be made of a metal alloy comprising 0.7 to 1.5% of zinc.
  • the insert 51 may have a corrugated conformation perpendicular to the direction of flow of the first heat transfer fluid, the ends of each corrugation being in contact with the walls of the flat tube 100.
  • the insert 51 may also have, parallel to the flow direction of the fluid coolant in the flat tube 100, series of corrugated sections, offset relative to each other perpendicular to the direction of circulation of the coolant.
  • the first heat transfer fluid then passes between the corrugations of each section, increasing the contact and exchange surface between the fluid and the walls of the flat tube 100, and during the passage from one corrugated section to another, the first heat transfer fluid undergoes a disturbance allowing homogenization of the temperature and therefore a better heat exchange efficiency with the flat tube 100.
  • said insert 51 may also have other conformations allowing an increase in the contact surface as well as a homogenization of the fluid such as for example crenels, zigzags or slats.
  • a flat-tube heat exchanger 100 comprises a stack of flat tubes 100 interconnected at their fluid inlet and outlet 3a, 3b, and each flat tube 100 being spaced to allow passage of a second fluid between said flat tubes 100.
  • the flat tubes 100 are interconnected at the fluid inlet and outlet 3a, 3b in order to form a fluid inlet column comprising all the fluid inlets of all the flat tubes 100 and an outlet column. of fluid comprising all the fluid outlets of all the flat tubes 100.
  • the use of inserts 51 as inserts 51 in the passes 5 of the flat tubes 100 allows the latter to have a smooth wall and thus facilitates the fixing, for example by brazing, disrupters 102 in space between two flat tubes 100.
  • the flat tube 100 due to the presence of a metal insert 51 made of a material creating a potential difference greater than or equal to 30mV with the material of the flat tube 100 and acting as a sacrificial anode , has a better resistance to corrosion, especially from the first fluid and therefore has a longer life.

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

Description

DescriptionDescription

L'invention concerne le domaine des échangeurs de chaleur et les échangeurs de chaleur d'air de suralimentation dans le domaine de l'automobile, en particulier un tube plat d'échangeur de chaleur d'air de suralimentation selon le préambule de la revendication 1. WO 2009/156365 décrit un tel tube.The invention relates to the field of heat exchangers and charge air heat exchangers in the field of automobiles, in particular a flat tube of charge air heat exchanger according to the preamble of claim 1. . WO 2009/156365 describes such a tube.

Il est connu dans le domaine de l'automobile d'utiliser des échangeurs de chaleur comprenant un empilement de tubes plats identiques dans lesquels circule un premier fluide. Chaque tube plat est généralement formé de deux plaques de tôle de métal embouties afin de former une cuvette selon un motif prédéfini et agencées de telle façon que leurs concavités sont tournées l'une vers l'autre. Les deux plaques sont alors reliées de façon étanche, formant ainsi un tube plat dans lequel peut circuler le premier fluide depuis une entrée de fluide vers une sortie de fluide, chacune située à une extrémité du tube plat et plus généralement chacune située sur des cotés opposés de la plaque.It is known in the field of the automobile to use heat exchangers comprising a stack of identical flat tubes in which a first fluid circulates. Each flat tube is generally formed of two plates of metal sheet stamped to form a bowl in a predefined pattern and arranged in such a way that their concavities are turned towards each other. The two plates are then connected in a sealed manner, thus forming a flat tube in which the first fluid can flow from a fluid inlet to a fluid outlet, each located at one end of the flat tube and more generally each located on opposite sides. of the plate.

Les tubes plats sont empilés les uns sur les autres, les entrées de fluides de chaque tube plat étant reliées entre elles pour former une colonne d'entrée. De même, les sorties de fluides de chaque tube plat sont reliées entre elles pour former une colonne de sortie. Entre chaque tube plat est laissé un espace pour le passage d'un second fluide. L'échange de chaleur entre les deux fluides se faisant ainsi lors du passage du premier fluide dans les tubes plats et du second fluide entre lesdits tubes plats.The flat tubes are stacked on each other, the fluid inlets of each flat tube being connected together to form an inlet column. Similarly, the fluid outlets of each flat tube are interconnected to form an output column. Between each flat tube is left a space for the passage of a second fluid. The exchange of heat between the two fluids thus occurring during the passage of the first fluid in the flat tubes and the second fluid between said flat tubes.

De tels échangeurs de chaleur sont couramment utilisés comme évaporateur dans un circuit de fluide réfrigérant pour la climatisation de l'habitacle d'un véhicule automobile, ce fluide réfrigérant constituant le premier fluide et le second fluide étant de l'air atmosphérique, ou comme radiateur de chauffage dans un circuit de fluide caloporteur pour le chauffage de l'habitacle d'un véhicule automobile, ce fluide caloporteur constituant le premier fluide et le second fluide étant de l'air atmosphérique.Such heat exchangers are commonly used as an evaporator in a refrigerant circuit for the air conditioning of the passenger compartment of a motor vehicle, this refrigerant constituting the first fluid and the second fluid being atmospheric air, or as a radiator. heating in a fluid circuit coolant for heating the passenger compartment of a motor vehicle, the heat transfer fluid constituting the first fluid and the second fluid being atmospheric air.

Néanmoins, de tels échangeurs peuvent ne pas être adaptés pour une utilisation dans un circuit d'admission d'air de suralimentation où les paramètres thermiques sont particuliers. En effet, avant d'entrer dans les cylindres de combustion, l'air d'admission comprimée et chauffée, doit être refroidie suffisamment au moyen d'un échangeur de chaleur afin de diminuer les risques d'auto-allumage, ce qu'un échangeur de chaleur classique peut ne pas être en mesure de réaliser efficacement. Généralement pour plus d'efficacité ce type d'échangeur pour air de suralimentation utilise comme premier fluide un liquide comme par exemple de l'eau afin de refroidir le second fluide qu'est l'air de suralimentation.Nevertheless, such exchangers may not be suitable for use in a charge air intake circuit where the thermal parameters are particular. In fact, before entering the combustion cylinders, the compressed and heated intake air must be cooled sufficiently by means of a heat exchanger in order to reduce the risks of self-ignition, which a conventional heat exchanger may not be able to achieve effectively. Generally for greater efficiency this type of intercooler for charge air uses as a first fluid a liquid such as water to cool the second fluid that is the supercharging air.

L'utilisation d'un liquide comme premier fluide à comme inconvénient de diminuer la tenue dans le temps de l'échangeur, en effet est plus susceptible d'être détérioré par la corrosion.The use of a liquid as the first fluid has the disadvantage of reducing the resistance of the exchanger over time, because it is more likely to be damaged by corrosion.

Ainsi, un des buts de l'invention est de remédier au moins partiellement aux inconvénients de l'art antérieur et de proposer un échangeur de chaleur d'air de suralimentation amélioré.Thus, one of the aims of the invention is to at least partially overcome the disadvantages of the prior art and to provide an improved supercharging air heat exchanger.

La présente invention concerne donc un tube plat d'échangeur de chaleur d'air de suralimentation réalisé à partir d'au moins une tôle de métal emboutie de sorte à former une plaque d'échange, ledit emboutissage permettant la liaison entre une entrée de fluide et une sortie de fluide par un circuit dans lequel circule un fluide caloporteur, ledit circuit comportant au moins un insert métallique placé en son sein et réalisé dans une matière créant une différence de potentiel supérieure ou égale à 30mV avec la matière du tube plat.The present invention therefore relates to a flat tube of charge air heat exchanger made from at least one pressed metal sheet so as to form an exchange plate, said stamping allowing the connection between a fluid inlet and a fluid outlet by a circuit in which a coolant circulates, said circuit comprising at least one metal insert placed therein and made of a material creating a potential difference greater than or equal to 30mV with the material of the flat tube.

Selon un aspect de l'invention, le tube plat est formé par l'assemblage de deux plaques d'échange réalisées à partir d'une tôle de métal emboutie et assemblées l'une à l'autre, les cotés emboutis de chaque plaque d'échange se faisant face.According to one aspect of the invention, the flat tube is formed by the assembly of two exchange plates made from a stamped metal sheet and assembled to one another, the stamped sides of each plate of exchange facing each other.

Selon un autre aspect de l'invention, l'insert est réalisé en alliage métallique comportant en proportion 0.7 à 1.5% de zinc.According to another aspect of the invention, the insert is made of metal alloy comprising 0.7 to 1.5% of zinc.

Selon un autre aspect de l'invention, la au moins une plaque d'échange est réalisée en alliage d'aluminium de série 3000 et que l'insert est réalisé en alliage d'aluminium 6815 ou 6807.According to another aspect of the invention, the at least one exchange plate is made of 3000 series aluminum alloy and the insert is made of aluminum alloy 6815 or 6807.

L'invention concerne également un échangeur de chaleur d'air de suralimentation comprenant au moins un tube plat comme décrit précédemment.The invention also relates to a charge air heat exchanger comprising at least one flat tube as described above.

D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description suivante, donnée à titre d'exemple illustratif et non limitatif, parmi lesquelles :

  • la figure 1 montre une représentation schématique d'une plaque d'échange,
  • la figure 2 montre une représentation schématique en coupe d'un tube plat selon l'invention.
Other features and advantages of the invention will appear more clearly on reading the following description, given by way of illustrative and non-limiting example, among which:
  • the figure 1 shows a schematic representation of an exchange plate,
  • the figure 2 shows a schematic representation in section of a flat tube according to the invention.

Les éléments identiques portent des références similaires sur les différentes figures.The identical elements bear similar references in the different figures.

La plaque d'échange 1 pour tube plat 100 d'échangeur de chaleur, représenté sur la figure 1, peut être réalisée à partir d'une tôle de métal emboutie. Elle comporte une entrée de fluide 3a et une sortie de fluide 3b. L'emboutissage de la plaque d'échange 1 forme une cavité avec des nervures 7 définissant un circuit d'écoulement de fluide entre l'entrée de fluide 3a et la sortie de fluide 3b.The exchange plate 1 for flat tube 100 of heat exchanger, shown in FIG. figure 1 can be made from a stamped metal sheet. It comprises a fluid inlet 3a and a fluid outlet 3b. The stamping of the exchange plate 1 forms a cavity with ribs 7 defining a fluid flow circuit between the fluid inlet 3a and the fluid outlet 3b.

Les nervures 7 donnent au circuit d'écoulement un chemin de circulation d'un premier fluide caloporteur entre l'entrée de fluide 3a et la sortie de fluide 3b. Ce chemin de circulation comporte au moins deux passes 5 rectilignes reliées par une portion courbe 9. Ce chemin de circulation permet une augmentation de la longueur du circuit d'écoulement et donc augmente le temps durant lequel le premier fluide caloporteur s'écoule en son sein, augmentant de fait le temps où il peut y avoir transfert de chaleur avec un second fluide circulant sur la face opposée de la plaque d'échange 1. Afin de faciliter cet écoulement du premier fluide caloporteur, les nervures 7 peuvent avoir des extrémités 11 arrondies.The ribs 7 give the flow path a flow path of a first heat transfer fluid between the fluid inlet 3a and the fluid outlet 3b. This circulation path comprises at least two straight passes 5 connected by a curved portion 9. This circulation path allows an increase in the length of the flow circuit and therefore increases the time during which the first heat transfer fluid flows within it. , thereby increasing the time when there can be heat transfer with a second fluid flowing on the opposite side of the exchange plate 1. In order to facilitate this flow of the first heat transfer fluid, the ribs 7 may have rounded ends 11 .

Dans l'exemple présenté à la figure 1, la plaque d'échange 1 comporte quatre passes 5 parallèles entre elles et trois portions courbes 9 faisant la liaison entre lesdites passes 5.In the example presented at figure 1 , the exchange plate 1 has four passes 5 parallel to each other and three curved portions 9 making the connection between said passes 5.

Comme le montre la figure 1, la au moins une portion courbe 9 peut comporter des saillies 91. Ces saillies 91 peuvent venir de matière avec la au moins une plaque d'échange 1, par exemple en étant réalisées par emboutissage, ou bien même être des éléments rapportées et fixés à l'intérieur de la au moins une portion courbe 9 par un moyen quelconque connu de l'homme du métier.As shown in figure 1 the at least one curved portion 9 may comprise projections 91. These protrusions 91 may be made of material with the at least one exchange plate 1, for example by being made by stamping, or even be attached elements and fixed to within the at least one curved portion 9 by any means known to those skilled in the art.

Les tubes plats 100 sont généralement constitués par l'assemblage de deux plaques d'échange 1 entre elles, les passes 5 et courbes 9 des circuits et les nervures 7 de chacune des deux plaques d'échange 1 se faisant face, formant le chemin de circulation dudit tube plat 100. L'assemblage des plaques d'échange 1 est réalisé de façon à être étanche, par exemple par brasage, afin d'éviter toutes fuites du fluide caloporteur passant dans le tube plat 100. De tels tubes plats 100 sont relativement fins par exemple leur chemin de circulation peut avoir une hauteur de 1mm à 3mm.The flat tubes 100 are generally constituted by the assembly of two exchange plates 1 between them, the passes 5 and curves 9 of the circuits and the ribs 7 of each of the two exchange plates 1 facing each other, forming the path of circulation of said flat tube 100. The assembly of the exchange plates 1 is made to be sealed, for example by soldering, in order to prevent any leakage of the coolant passing through the flat tube 100. Such flat tubes 100 are relatively thin for example their circulation path can have a height of 1mm to 3mm.

Un autre mode de réalisation d'un tube plat 100 peut être l'assemblage d'une plaque d'échange 1 avec une plaque plane reposant sur la périphérie de la plaque d'échange 1 et sur les nervures 7, recouvrant le circuit d'écoulement.Another embodiment of a flat tube 100 may be the assembly of an exchange plate 1 with a flat plate resting on the periphery of the exchange plate 1 and on the ribs 7, covering the circuit of FIG. flow.

Comme le montre la figure 2, à l'intérieur du tube plat 100, le circuit comporte au moins un insert 51 destiné à perturber la circulation du premier fluide caloporteur et créant des turbulences, ainsi qu'augmenter la surface de contact avec le premier fluide caloporteur et donc d'augmenter les échanges entre ledit premier fluide et le tube plat 100.As shown in figure 2 inside the flat tube 100, the circuit comprises at least one insert 51 intended to disturb the circulation of the first heat transfer fluid and creating turbulence, as well as increasing the contact surface with the first heat transfer fluid and therefore increase exchanges between said first fluid and the flat tube 100.

Le au moins un insert 51 est réalisé dans une matière métallique créant une différence de potentiel supérieure ou égale à 30mV avec la matière du tube plat 100. Cette différence de potentiel permet audit insert d'être une anode sacrificielle qui est corrodé préférentiellement à la place de la matière du tube plat 100, ce dernier acquérant de fait une meilleure tenue à la corrosion dans le temps.The at least one insert 51 is made of a metallic material creating a potential difference greater than or equal to 30mV with the material of the flat tube 100. This potential difference allows said insert to be a sacrificial anode which is corroded preferentially instead. of the material of the flat tube 100, the latter in fact acquiring better resistance to corrosion over time.

Afin que l'insert 51 soit une anode sacrificielle efficace, ledit insert peut être réalisé en alliage métallique comportant en proportion 0.7 à 1.5% de zinc.So that the insert 51 is an effective sacrificial anode, said insert can be made of a metal alloy comprising 0.7 to 1.5% of zinc.

On peut ainsi imaginer un tube plat 100 réalisé à partir de plaques d'échange 1 en alliage d'aluminium de série 3000, par exemple en alliage d'aluminium 3003 ou 3916, et comportant un insert réalisé en alliage d'aluminium 6815 ou 6807 qui comportent du zinc dans les proportions optimales.It is thus possible to imagine a flat tube 100 made from exchange plates 1 made of aluminum alloy 3000 series, for example aluminum alloy 3003 or 3916, and comprising an insert made of aluminum alloy 6815 or 6807 which contain zinc in optimal proportions.

L'insert 51 peut avoir une conformation ondulée perpendiculairement au sens de circulation du premier fluide caloporteur, les extrémités de chaque ondulation étant en contact avec les parois du tube plat 100. L'insert 51 peut également présenter, parallèlement au sens de circulation du fluide caloporteur dans le tube plat 100, des séries de sections ondulées, décalées les unes par rapport aux autres perpendiculairement au sens de circulation du fluide caloporteur. Le premier fluide caloporteur passe alors entre les ondulations de chaque section, augmentant la surface de contact et d'échange entre le fluide et les parois du tube plat 100, et lors du passage d'une section ondulée à une autre, le premier fluide caloporteur subit une perturbation permettant une homogénéisation de la température et donc un meilleur rendement d'échange de chaleur avec le tube plat 100.The insert 51 may have a corrugated conformation perpendicular to the direction of flow of the first heat transfer fluid, the ends of each corrugation being in contact with the walls of the flat tube 100. The insert 51 may also have, parallel to the flow direction of the fluid coolant in the flat tube 100, series of corrugated sections, offset relative to each other perpendicular to the direction of circulation of the coolant. The first heat transfer fluid then passes between the corrugations of each section, increasing the contact and exchange surface between the fluid and the walls of the flat tube 100, and during the passage from one corrugated section to another, the first heat transfer fluid undergoes a disturbance allowing homogenization of the temperature and therefore a better heat exchange efficiency with the flat tube 100.

Bien entendue, ledit insert 51 peut également avoir d'autres conformations permettant une augmentation de la surface de contact ainsi qu'une homogénéisation du fluide comme par exemple des créneaux, des zigzags ou encore des lamelles.Of course, said insert 51 may also have other conformations allowing an increase in the contact surface as well as a homogenization of the fluid such as for example crenels, zigzags or slats.

Un échangeur de chaleur à tube plat 100 comporte un empilement de tubes plats 100 reliés entre eux au niveau de leur entrée et sortie de fluide 3a, 3b, et chaque tube plat 100 étant espacé afin de permettre le passage d'un second fluide entre lesdits tubes plats 100. Les tubes plats 100 sont reliés entre eux au niveau des entrée et sortie de fluide 3a, 3b afin de former une colonne d'entrée de fluide regroupant toutes les entrées de fluide de tout les tubes plats 100 et une colonne de sortie de fluide regroupant toutes les sorties de fluide de tout les tubes plats 100. Afin de faciliter l'échange de chaleur entre le premier fluide caloporteur circulant dans les tubes plats 100 et le second fluide passant entre lesdits tubes plats 100, il est également possible d'ajouter de part et d'autre du tube plat 100, des perturbateurs 102 comme des ailettes dans l'espace entre deux tubes plats 100.
L'utilisation de pièces rapportées en guise d'inserts 51 dans les passes 5 des tubes plats 100, permet à ce dernier d'avoir une paroi lisse et donc qui facilite la fixation, par exemple par brasage, des perturbateurs 102 dans l'espace entre deux tubes plats 100.A flat-tube heat exchanger 100 comprises a stack of flat tubes 100 interconnected at their fluid inlet and outlet 3a, 3b, and each flat tube 100 being spaced to allow passage of a second fluid between said flat tubes 100. The flat tubes 100 are interconnected at the fluid inlet and outlet 3a, 3b in order to form a fluid inlet column comprising all the fluid inlets of all the flat tubes 100 and an outlet column. of fluid comprising all the fluid outlets of all the flat tubes 100. In order to facilitate the exchange of heat between the first heat transfer fluid circulating in the flat tubes 100 and the second fluid passing between said flat tubes 100, it is also possible to adding on both sides of the flat tube 100, disrupters 102 as fins in the space between two flat tubes 100.
The use of inserts 51 as inserts 51 in the passes 5 of the flat tubes 100, allows the latter to have a smooth wall and thus facilitates the fixing, for example by brazing, disrupters 102 in space between two flat tubes 100.

Ainsi, on voit bien que le tube plat 100 du fait de la présence d'un insert 51 métallique réalisé dans une matière créant une différence de potentiel supérieure ou égale à 30mV avec la matière du tube plat 100 et jouant le rôle d'anode sacrificielle, a une meilleur tenue à la corrosion, notamment issue du premier fluide et donc a une durée de vie plus importante.Thus, it is clear that the flat tube 100 due to the presence of a metal insert 51 made of a material creating a potential difference greater than or equal to 30mV with the material of the flat tube 100 and acting as a sacrificial anode , has a better resistance to corrosion, especially from the first fluid and therefore has a longer life.

Claims (5)

  1. Flat tube (100) of a charge air heat exchanger, produced from at least one metal sheet that has been pressed to form at least one exchange plate (1), said pressing allowing a fluid inlet (3a) and a fluid outlet (3b) to be connected by a circuit through which a heat-transfer fluid circulates, said circuit comprising at least two rectilinear passes (5) connected by a curved portion (9), characterized in that said circuit comprises at least one metal insert (51) placed within it and made from a material that creates a potential difference of 30 mV or more with the material of the flat tube (100).
  2. Flat tube (100) according to the preceding claim, characterized in that said flat tube (100) is formed by the assembly of two exchange plates (1) which have been produced from a pressed metal sheet and assembled with one another, the pressed sides of each exchange plate (1) facing each other.
  3. Flat tube (100) according to one of the preceding claims, characterized in that the insert (51) is made of a metal alloy containing proportionately 0.7 to 1.5% zinc.
  4. Flat tube (100) according to the preceding claim, characterized in that the at least one exchange plate (1) is made of a 3000-series aluminium alloy and that the insert (51) is made of a 6815 or 6807 aluminium alloy.
  5. Charge air heat exchanger comprising at least one flat tube (100) according to one of Claims 1 to 4.
EP13811212.3A 2012-12-18 2013-12-18 Flat tube for a charge air cooler and corresponding charge air cooler Active EP2936038B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13811212T PL2936038T3 (en) 2012-12-18 2013-12-18 Flat tube for a charge air cooler and corresponding charge air cooler

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1262265A FR2999696B1 (en) 2012-12-18 2012-12-18 FLAT TUBE FOR EXHAUST AIR HEAT EXCHANGER AND HEAT EXCHANGER OF CORRESPONDING SUPERVISION AIR HEAT.
PCT/EP2013/077244 WO2014096105A1 (en) 2012-12-18 2013-12-18 Flat tube for a charge air cooler and corresponding charge air cooler

Publications (2)

Publication Number Publication Date
EP2936038A1 EP2936038A1 (en) 2015-10-28
EP2936038B1 true EP2936038B1 (en) 2019-07-31

Family

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Application Number Title Priority Date Filing Date
EP13811212.3A Active EP2936038B1 (en) 2012-12-18 2013-12-18 Flat tube for a charge air cooler and corresponding charge air cooler

Country Status (9)

Country Link
US (1) US11098639B2 (en)
EP (1) EP2936038B1 (en)
JP (1) JP6400596B2 (en)
KR (1) KR101679344B1 (en)
CN (2) CN112228210A (en)
ES (1) ES2753204T3 (en)
FR (1) FR2999696B1 (en)
PL (1) PL2936038T3 (en)
WO (1) WO2014096105A1 (en)

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WO2017072177A1 (en) * 2015-10-29 2017-05-04 Danfoss A/S Cathodic protection of a heat exchanger

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Also Published As

Publication number Publication date
FR2999696A1 (en) 2014-06-20
US11098639B2 (en) 2021-08-24
US20150322846A1 (en) 2015-11-12
ES2753204T3 (en) 2020-04-07
PL2936038T3 (en) 2020-05-18
CN104995479A (en) 2015-10-21
KR101679344B1 (en) 2016-11-24
FR2999696B1 (en) 2018-09-14
JP2016500436A (en) 2016-01-12
CN112228210A (en) 2021-01-15
EP2936038A1 (en) 2015-10-28
KR20150093241A (en) 2015-08-17
JP6400596B2 (en) 2018-10-03
WO2014096105A1 (en) 2014-06-26

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