EP0757218A1 - U-flow tube for heat exchanger and method for manufacturing same - Google Patents

U-flow tube for heat exchanger and method for manufacturing same Download PDF

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Publication number
EP0757218A1
EP0757218A1 EP96111920A EP96111920A EP0757218A1 EP 0757218 A1 EP0757218 A1 EP 0757218A1 EP 96111920 A EP96111920 A EP 96111920A EP 96111920 A EP96111920 A EP 96111920A EP 0757218 A1 EP0757218 A1 EP 0757218A1
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EP
European Patent Office
Prior art keywords
blank
sheet
sheet blank
folded
tube
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Withdrawn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
EP96111920A
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German (de)
French (fr)
Inventor
Carlos Martins
Martin Wurmser
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 Climatisation SA
Original Assignee
Valeo Climatisation 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 Climatisation SA filed Critical Valeo Climatisation SA
Publication of EP0757218A1 publication Critical patent/EP0757218A1/en
Withdrawn legal-status Critical Current

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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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0308—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other
    • F28D1/035—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other with U-flow or serpentine-flow inside the conduits
    • 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
    • F28F9/0202—Header boxes having their inner space divided by partitions
    • F28F9/0204—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions
    • F28F9/0214—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions having only longitudinal partitions
    • F28F9/0217—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions having only longitudinal partitions the partitions being separate elements attached to header boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2220/00—Closure means, e.g. end caps on header boxes or plugs on conduits

Definitions

  • the invention relates to a U-shaped circulation tube for a heat exchanger and to a process for its production.
  • It also relates to a heat exchanger provided with a multiplicity of such U-shaped circulation tubes.
  • Heat exchangers are already known, in particular for motor vehicles, which comprise a bundle of U-shaped circulation tubes, also called “U-shaped tubes", and into which the ends of each tube open, in a sealed manner, in a box. fluid.
  • U-shaped circulation tubes also called “U-shaped tubes”
  • these tubes also pass through fins to increase the heat exchange surface between a heat transfer fluid which traverses the tubes of the bundle and an air flow which scans the bundle.
  • the object of the invention is in particular to overcome the aforementioned drawbacks.
  • the invention provides a U-shaped circulation tube for a heat exchanger, which is obtained from a sheet metal blank folded back on itself from a fold line so as to constitute two parts. joined together by brazing on the side of an internal face of the blank, these two parts of the blank being stamped from the internal face to form two hollow imprints in a general U-shape which jointly delimit a U-shaped channel having two mouths s opening on an edge of the folded blank.
  • a U-shaped circulation tube is thus obtained in a simple manner by stamping and folding of a sheet metal blank which then suffices to braze.
  • This brazing operation can be carried out on the tube itself, or preferably at the same time as the connection of all of the tubes with the other components of a heat exchanger, i.e. the box fluid and the fins.
  • each of the U-shaped imprints is formed by two substantially parallel branches joined by an elbow.
  • the respective elbows of the two U-shaped indentations are located symmetrically on either side of the fold line, the sheet blank being considered flat.
  • a blank of aluminum sheet coated with a brazing alloy on its internal face is particularly preferred.
  • the sheet metal blank has a cutout between the two mouths of the U-shaped channel so as to separate these two mouths and provide two feet of tube, which then facilitates connection to a heat exchanger fluid box.
  • the folded sheet blank further comprises an end portion folded substantially at right angles to form a spacer member.
  • This spacer member is advantageously located opposite the mouths of the channel, which allows the tubes of the same heat exchanger to be joined together, in a region opposite to the fluid box.
  • Each of the U-shaped imprints is advantageously formed of two substantially parallel branches joined by an elbow.
  • the respective elbows of the two U-shaped imprints are located symmetrically on either side of the line of symmetry.
  • the sheet blank is advantageously made of aluminum and is coated with a brazing alloy on its internal face.
  • the method of the invention may also comprise an operation consisting in cutting the sheet blank, in the thickness of each of the two parts of the sheet blank, in order to separate the two mouths of the U-shaped duct.
  • the method of the invention may comprise an additional operation consisting in bending, at substantially right angles, an end portion of the sheet blank already folded to form a spacer member.
  • FIG. 1 shows a sheet metal sheet 10 of generally rectangular shape limited by two long sides 12 and two short sides 14.
  • the sheet metal blank 10 has been stamped to form, from an internal face F of the latter, two indentations 16 in the general shape of U arranged symmetrically with respect to a line of symmetry L which divides the blank into two parts 18. This line L extends parallel to the two short sides 14 and halfway between them.
  • Each of the indentations 16 has the general shape of a U and is formed by two branches 20 substantially parallel to one another and to the long sides 12, these two branches being further joined together by an elbow 22. These two elbows are located symmetrically on either side of the line of symmetry L.
  • the two branches 20 of an imprint 16 end in mouths 24 which end at a short side 14 forming a free edge of the sheet metal blank 10.
  • These mouths 24 are intended to form feet of tubes, as will be seen below.
  • the blank 10 comprises, between each pair of mouthpieces 24, a cutout 26 formed from the free edge 14.
  • each of the imprints 16 is surrounded by a peripheral border 28 and by an internal border 30, which borders are in the initial plane of the sheet, before it is stamped.
  • the blank of FIG. 1 is then folded back on itself, on either side of the line of symmetry L (as shown by the arrows F) so as to bring the two parts 18 of the sheet blank together to bring them together in contact on the side of the internal face.
  • the respective edges 18 come into mutual contact, as do the edges 30.
  • the two indentations 16 jointly delimit a U-shaped channel having two mouths opening onto an edge of the folded blank, as seen in FIG. 2.
  • the folded sheet blank comprises an end portion 32 folded substantially at a right angle.
  • This part 32 is obtained by folding around a fold line P which is parallel to the line of symmetry L.
  • This end part is intended to form a spacer, as can be seen in FIG. 3.
  • the sheet blank is advantageously made of aluminum, coated with a brazing alloy on the side of the internal face F.
  • a brazing alloy on the side of the internal face F.
  • This brazing operation can be carried out on the tube itself or, preferably, on a set of tubes forming a heat exchanger.
  • cutouts 26 can be either made on the blank before folding, or on the blank already folded.
  • the U-shaped tube has two feet of tube 34 spaced from one another ( Figure 2).
  • FIGS. 3 and 4 show a heat exchanger 36 comprising a plurality of tubes, each obtained from a blank 10 as described above.
  • the tubes are arranged parallel to each other and the two feet 34 of each tube are introduced into the holes 38 of a collecting plate 40, which has a folded edge 42 (FIG. 4).
  • the collector plate 40 comes to cap a fluid box 44 with U-shaped section comprising a core 46 and two wings 48 which are fitted in the edges 42.
  • a longitudinal partition 50 is disposed between the manifold plate 40 and the fluid box 36 to delimit in the latter two adjacent compartments which communicate, each time, with two separate mouths 24 of the same tube.
  • a heat transfer fluid can enter one of the compartments of the fluid box, circulate in the different tubes and reach the other compartment, as shown by the arrows in FIG. 4.
  • corrugated spacers 52 Between two adjacent tubes are disposed each time corrugated spacers 52 forming cooling fins.
  • two plates 54 are provided respectively at the two ends of the bundle.
  • the sheet metal blank 10 is advantageously formed from a metallic material, generally aluminum, coated solder plating.
  • the folded parts 32 of the tubes form spacer members (FIG. 3) which also contribute to the mechanical strength of the assembly.
  • the folding of the sheet blank could be carried out with respect to a line of symmetry extending parallel to the general direction of the branches of the U-shaped imprints.
  • the invention is particularly intended for heat exchangers for motor vehicles.

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

Abstract

The U-tube is made from a flat metal sheet, pressed and folded about a transverse line (L) to form two sections (18) which have their inner faces joined together by brazing so that their two pressed recesses (16) form a U-shaped channel which has two parallel branches joined by a curve. The flat metal sheet is of aluminium, coated with a brazing alloy on its inner face, and has a cut-away portion (26) in between the two open ends of the tube. The lower end (32) of the U-tube unit is bent over at right angles to act as a spacer when assembled with other units.

Description

L'invention concerne un tube à circulation en U pour échangeur de chaleur ainsi qu'un procédé pour sa fabrication.The invention relates to a U-shaped circulation tube for a heat exchanger and to a process for its production.

Elle concerne également un échangeur de chaleur muni d'une multiplicité de tels tubes à circulation en U.It also relates to a heat exchanger provided with a multiplicity of such U-shaped circulation tubes.

On connaît déjà des échangeurs de chaleur, notamment pour véhicules automobiles, qui comprennent un faisceau de tubes à circulation en U, encore appelés "tubes en U", et dans lesquels les extrémités de chaque tube débouchent, de façon étanche, dans une boîte à fluide. Habituellement, ces tubes traversent également des ailettes pour augmenter la surface d'échange thermique entre un fluide caloporteur qui parcourt les tubes du faisceau et un flux d'air qui balaie le faisceau.Heat exchangers are already known, in particular for motor vehicles, which comprise a bundle of U-shaped circulation tubes, also called "U-shaped tubes", and into which the ends of each tube open, in a sealed manner, in a box. fluid. Usually, these tubes also pass through fins to increase the heat exchange surface between a heat transfer fluid which traverses the tubes of the bundle and an air flow which scans the bundle.

Dans la plupart des échangeurs de chaleur connus, ces tubes en U sont obtenus par extrusion puis par cintrage pour leur donner une forme dite "en épingle à cheveu", les extrémités des tubes étant ensuite reliées à étanchéité à une plaque collectrice d'une boîte à fluide.In most known heat exchangers, these U-shaped tubes are obtained by extrusion and then by bending to give them a so-called "hairpin" shape, the ends of the tubes then being tightly connected to a collector plate of a box. to fluid.

L'un des inconvénients de ces échangeurs de chaleur connus est que leur fabrication nécessite un grand nombre d'opérations.One of the drawbacks of these known heat exchangers is that their manufacture requires a large number of operations.

Il est connu par ailleurs de réaliser des tubes plats à deux branches parallèles, encore appelés "tubes bi-canaux", obtenus par brasage de deux plaques métalliques embouties.It is also known to produce flat tubes with two parallel branches, also called "two-channel tubes", obtained by brazing two stamped metal plates.

L'inconvénient de tels tubes est qu'ils doivent être utilisés dans des échangeurs de chaleur à deux boîtes à fluide opposées, ce qui nécessite, là encore, un grand nombre d'opérations pour la fabrication.The disadvantage of such tubes is that they must be used in heat exchangers with two opposite fluid boxes, which again requires a large number of operations for manufacturing.

L'invention a notamment pour but de surmonter les inconvénients précités.The object of the invention is in particular to overcome the aforementioned drawbacks.

Elle a en particulier pour but de procurer un tube à circulation en U permettant la réalisation d'un échangeur de chaleur en une seule opération de brasage.It aims in particular to provide a U-shaped circulation tube allowing the production of a heat exchanger in a single brazing operation.

L'invention propose à cet effet un tube à circulation en U pour un échangeur de chaleur, lequel est obtenu à partir d'un flan en tôle métallique replié sur lui-même à partir d'une ligne de pliage de manière à constituer deux parties réunies entre elles par brasage du côté d'une face interne du flan, ces deux parties du flan étant embouties à partir de la face interne pour constituer deux empreintes en creux en forme générale de U qui délimitent conjointement un canal en U ayant deux embouchures s'ouvrant sur un bord du flan plié.To this end, the invention provides a U-shaped circulation tube for a heat exchanger, which is obtained from a sheet metal blank folded back on itself from a fold line so as to constitute two parts. joined together by brazing on the side of an internal face of the blank, these two parts of the blank being stamped from the internal face to form two hollow imprints in a general U-shape which jointly delimit a U-shaped channel having two mouths s opening on an edge of the folded blank.

On obtient ainsi de manière simple un tube de circulation en U par emboutissage et pliage d'un flan en tôle qu'il suffit ensuite de braser.A U-shaped circulation tube is thus obtained in a simple manner by stamping and folding of a sheet metal blank which then suffices to braze.

Cette opération de brasage peut être effectuée sur le tube lui-même, ou de préférence en même temps que la liaison de l'ensemble des tubes avec les autres composants d'un échangeur de chaleur, c'est-à-dire la boîte à fluide et les ailettes.This brazing operation can be carried out on the tube itself, or preferably at the same time as the connection of all of the tubes with the other components of a heat exchanger, i.e. the box fluid and the fins.

Dans une forme de réalisation de l'invention, chacune des empreintes en U est formée de deux branches sensiblement parallèles réunies par un coude.In one embodiment of the invention, each of the U-shaped imprints is formed by two substantially parallel branches joined by an elbow.

De façon avantageuse, les coudes respectifs des deux empreintes en U sont situés symétriquement de part et d'autre de la ligne de pliage, le flan de tôle étant considéré à plat.Advantageously, the respective elbows of the two U-shaped indentations are located symmetrically on either side of the fold line, the sheet blank being considered flat.

Pour la mise en oeuvre de l'invention, on préfère tout particulièrement un flan de tôle en aluminium revêtu d'un alliage de brasure sur sa face interne.For the implementation of the invention, a blank of aluminum sheet coated with a brazing alloy on its internal face is particularly preferred.

Ceci facilite ensuite l'opération de brasage.This then facilitates the soldering operation.

De façon avantageuse, le flan de tôle comporte une découpe entre les deux embouchures du canal en U de manière à séparer ces deux embouchures et fournir deux pieds de tube, ce qui facilite ensuite la liaison à une boîte à fluide d'échangeur de chaleur.Advantageously, the sheet metal blank has a cutout between the two mouths of the U-shaped channel so as to separate these two mouths and provide two feet of tube, which then facilitates connection to a heat exchanger fluid box.

Selon une autre caractéristique de l'invention, le flan en tôle pliée comprend en outre une partie d'extrémité pliée sensiblement à angle droit pour former un organe espaceur.According to another characteristic of the invention, the folded sheet blank further comprises an end portion folded substantially at right angles to form a spacer member.

Cet organe espaceur est avantageusement situé à l'opposé des embouchures du canal, ce qui permet de solidariser entre eux les tubes d'un même échangeur de chaleur, dans une région opposée à la boîte à fluide.This spacer member is advantageously located opposite the mouths of the channel, which allows the tubes of the same heat exchanger to be joined together, in a region opposite to the fluid box.

Sous un autre aspect, l'invention concerne un procédé de fabrication d'un tube à circulation en U tel que défini précédemment, ce procédé comprenant les opérations suivantes :

  • préparer un flan de tôle métallique,
  • emboutir le flan de tôle pour former, à partir d'une face interne du flan de tôle, deux empreintes en creux en forme générale de U disposées symétriquement par rapport à une ligne de symétrie partageant le flan en deux parties,
  • replier le flan de tôle sur lui-même de part et d'autre de cette ligne de symétrie et rapprocher mutuellement les deux parties du flan de tôle pour les mettre en contact du côté de la face interne, et
  • braser entre elles les deux parties du flan de tôle, ce qui permet d'obtenir un canal en U délimité conjointement par les deux empreintes en U et présentant deux embouchures s'ouvrant sur un bord du flan plié.
In another aspect, the invention relates to a method of manufacturing a U-shaped circulation tube as defined above, this method comprising the following operations:
  • prepare a sheet of metal sheet,
  • stamping the sheet blank to form, from an internal face of the sheet blank, two hollow indentations in the general shape of U arranged symmetrically with respect to a line of symmetry dividing the blank in two parts,
  • fold the sheet metal blank back onto itself on either side of this line of symmetry and bring the two parts of the sheet metal blank together to bring them into contact on the side of the internal face, and
  • braze together the two parts of the sheet metal blank, which makes it possible to obtain a U-shaped channel delimited jointly by the two U-shaped imprints and having two mouths opening onto an edge of the folded blank.

Chacune des empreintes en U est avantageusement formée de deux branches sensiblement parallèles réunies par un coude.Each of the U-shaped imprints is advantageously formed of two substantially parallel branches joined by an elbow.

Avantageusement, les coudes respectifs des deux empreintes en U sont situés symétriquement de part et d'autre de la ligne de symétrie.Advantageously, the respective elbows of the two U-shaped imprints are located symmetrically on either side of the line of symmetry.

Le flan de tôle est avantageusement en aluminium et est revêtu d'un alliage de brasure sur sa face interne.The sheet blank is advantageously made of aluminum and is coated with a brazing alloy on its internal face.

Le procédé de l'invention peut comprendre en outre une opération consistant à découper le flan de tôle, dans l'épaisseur de chacune des deux parties du flan de tôle, pour séparer les deux embouchures du conduit en U.The method of the invention may also comprise an operation consisting in cutting the sheet blank, in the thickness of each of the two parts of the sheet blank, in order to separate the two mouths of the U-shaped duct.

Egalement, le procédé de l'invention peut comprendre une opération supplémentaire consistant à plier sensiblement à angle droit une partie d'extrémité du flan de tôle déjà pliée pour former un organe espaceur.Also, the method of the invention may comprise an additional operation consisting in bending, at substantially right angles, an end portion of the sheet blank already folded to form a spacer member.

Dans la description qui suit, faite seulement à titre d'exemple, on se réfère au dessin annexé, sur lequel :

  • la figure 1 est une vue de face d'un flan de tôle préalablement embouti et découpé et prêt à être replié sur lui-même;
  • la figure 2 est une vue en perspective d'un tube à circulation en U obtenu à partir du flan de tôle de la figure 1;
  • la figure 3 est une vue partielle de côté d'un échangeur de chaleur comprenant une multiplicité de tubes en U selon la figure 2; et
  • la figure 4 est une vue en coupe selon la ligne IV-IV de la figure 3.
In the description which follows, given solely by way of example, reference is made to the appended drawing, in which:
  • Figure 1 is a front view of a sheet blank previously stamped and cut and ready to be folded on itself;
  • Figure 2 is a perspective view of a U-shaped flow tube obtained from the sheet blank of Figure 1;
  • Figure 3 is a partial side view of a heat exchanger comprising a plurality of U-shaped tubes according to Figure 2; and
  • FIG. 4 is a sectional view along the line IV-IV of FIG. 3.

On se réfère tout d'abord à la figure 1 qui montre un flan 10 en tôle métallique de forme générale rectangulaire limité par deux grands côtés 12 et deux petits côtés 14. Le flan de tôle 10 a été embouti pour former, à partir d'une face interne F de ce dernier, deux empreintes en creux 16 en forme générale de U disposées symétriquement par rapport à une ligne de symétrie L qui partage le flan en deux parties 18. Cette ligne L s'étend parallèlement aux deux petits côtés 14 et à mi-distance de ces derniers.First of all, reference is made to FIG. 1 which shows a sheet metal sheet 10 of generally rectangular shape limited by two long sides 12 and two short sides 14. The sheet metal blank 10 has been stamped to form, from an internal face F of the latter, two indentations 16 in the general shape of U arranged symmetrically with respect to a line of symmetry L which divides the blank into two parts 18. This line L extends parallel to the two short sides 14 and halfway between them.

Chacune des empreintes 16 a la forme générale d'un U et est formée de deux branches 20 sensiblement parallèles entre elles et aux grands côtés 12, ces deux branches étant en outre réunies entre elles par un coude 22. Ces deux coudes sont situés symétriquement de part et d'autre de la ligne de symétrie L.Each of the indentations 16 has the general shape of a U and is formed by two branches 20 substantially parallel to one another and to the long sides 12, these two branches being further joined together by an elbow 22. These two elbows are located symmetrically on either side of the line of symmetry L.

Les deux branches 20 d'une empreinte 16 se terminent par des embouchures 24 qui aboutissent à un petit côté 14 formant bord libre du flan de tôle 10.The two branches 20 of an imprint 16 end in mouths 24 which end at a short side 14 forming a free edge of the sheet metal blank 10.

Ces embouchures 24 sont destinées à former des pieds de tubes, comme on le verra plus loin.These mouths 24 are intended to form feet of tubes, as will be seen below.

Pour faciliter l'emmanchement ultérieur des pieds de tubes, le flan 10 comprend entre chacune des paires d'embouchures 24 une découpe 26 formée à partir du bord libre 14.To facilitate the subsequent fitting of the tube feet, the blank 10 comprises, between each pair of mouthpieces 24, a cutout 26 formed from the free edge 14.

On comprendra que les empreintes 16 sont formées en creux et que, en dehors de ces empreintes, la tôle est coplanaire. Ainsi, chacune des empreintes 16 est entourée par une bordure périphérique 28 et par une bordure intérieure 30, lesquelles bordures sont dans le plan initial de la tôle, avant son emboutissage.It will be understood that the imprints 16 are hollowed out and that, apart from these imprints, the sheet is coplanar. Thus, each of the imprints 16 is surrounded by a peripheral border 28 and by an internal border 30, which borders are in the initial plane of the sheet, before it is stamped.

Le flan de la figure 1 est ensuite replié sur lui-même, de part et d'autre de la ligne de symétrie L (comme montré par les flèches F) de manière à rapprocher mutuellement les deux parties 18 du flan de tôle pour les mettre en contact du côté de la face interne. Il en résulte que les bordures respectives 18 viennent en contact mutuel, de même que les bordures 30. Dans la position ainsi obtenue, les deux empreintes 16 délimitent conjointement un canal en U ayant deux embouchures s'ouvrant sur un bord du flan plié, comme on le voit sur la figure 2.The blank of FIG. 1 is then folded back on itself, on either side of the line of symmetry L (as shown by the arrows F) so as to bring the two parts 18 of the sheet blank together to bring them together in contact on the side of the internal face. As a result, the respective edges 18 come into mutual contact, as do the edges 30. In the position thus obtained, the two indentations 16 jointly delimit a U-shaped channel having two mouths opening onto an edge of the folded blank, as seen in FIG. 2.

En outre, dans le cas particulier de la figure 2, le flan en tôle pliée comprend une partie d'extrémité 32 pliée sensiblement à angle droit. Cette partie 32 est obtenue par pliage autour d'une ligne de pliage P qui est parallèle à la ligne de symétrie L. Cette partie d'extrémité est destinée à former un organe d'espacement, comme on peut le voir sur la figure 3.In addition, in the particular case of FIG. 2, the folded sheet blank comprises an end portion 32 folded substantially at a right angle. This part 32 is obtained by folding around a fold line P which is parallel to the line of symmetry L. This end part is intended to form a spacer, as can be seen in FIG. 3.

Le flan de tôle est avantageusement réalisé en aluminium, revêtu d'un alliage de brasure du côté de la face interne F. Ainsi, après pliage du flan de tôle sur lui-même, il est possible de former un tube en U en le soumettant à une cuisson dans un four approprié.The sheet blank is advantageously made of aluminum, coated with a brazing alloy on the side of the internal face F. Thus, after folding the sheet blank on itself, it is possible to form a U-shaped tube by subjecting it cooking in an appropriate oven.

Cette opération de brasage peut s'effectuer sur le tube lui-même ou, de préférence, sur un ensemble de tubes formant échangeur de chaleur.This brazing operation can be carried out on the tube itself or, preferably, on a set of tubes forming a heat exchanger.

Il est à noter que les découpes 26 peuvent être, soit réalisées sur le flan avant pliage, soit sur le flan déjà replié.It should be noted that the cutouts 26 can be either made on the blank before folding, or on the blank already folded.

Du fait des découpes 26, le tube en U présente deux pieds de tube 34 distants l'un de l'autre (figure 2).Due to the cutouts 26, the U-shaped tube has two feet of tube 34 spaced from one another (Figure 2).

On se réfère maintenant aux figures 3 et 4 qui montrent un échangeur de chaleur 36 comportant une multiplicité de tubes, chacun obtenu à partir d'un flan 10 comme décrit précédemment.Referring now to Figures 3 and 4 which show a heat exchanger 36 comprising a plurality of tubes, each obtained from a blank 10 as described above.

Les tubes sont disposés parallèlement entre eux et les deux pieds 34 de chaque tube sont introduits dans les trous 38 d'une plaque collectrice 40, laquelle comporte un bord replié 42 (figure 4). La plaque collectrice 40 vient coiffer une boîte à fluide 44 à section en U comportant une âme 46 et deux ailes 48 qui sont emmanchées dans les bords 42. Par ailleurs, une cloison longitudinale 50 est disposée entre la plaque collectrice 40 et la boîte à fluide 36 pour délimiter dans cette dernière deux compartiments adjacents qui communiquent, à chaque fois, avec deux embouchures distinctes 24 d'un même tube. Ainsi, un fluide caloporteur peut pénétrer dans l'un des compartiments de la boîte à fluide, circuler dans les différents tubes et gagner l'autre compartiment,-comme montré par les flèches sur la figure 4.The tubes are arranged parallel to each other and the two feet 34 of each tube are introduced into the holes 38 of a collecting plate 40, which has a folded edge 42 (FIG. 4). The collector plate 40 comes to cap a fluid box 44 with U-shaped section comprising a core 46 and two wings 48 which are fitted in the edges 42. Furthermore, a longitudinal partition 50 is disposed between the manifold plate 40 and the fluid box 36 to delimit in the latter two adjacent compartments which communicate, each time, with two separate mouths 24 of the same tube. Thus, a heat transfer fluid can enter one of the compartments of the fluid box, circulate in the different tubes and reach the other compartment, as shown by the arrows in FIG. 4.

Entre deux tubes adjacents sont disposés à chaque fois des intercalaires ondulés 52 formant ailettes de refroidissement. En outre, deux plaques 54, dont une seule est visible sur la figure 3, sont prévues respectivement aux deux extrémités du faisceau.Between two adjacent tubes are disposed each time corrugated spacers 52 forming cooling fins. In addition, two plates 54, only one of which is visible in FIG. 3, are provided respectively at the two ends of the bundle.

Il est à noter que non seulement le flan de tôle 10, mais aussi la plaque collectrice 40, la boîte à fluide 36, la cloison 50 et les ailettes 52, sont avantageusement formées d'une matière métallique, généralement de l'aluminium, revêtue d'un placage de brasure.It should be noted that not only the sheet metal blank 10, but also the collector plate 40, the fluid box 36, the partition 50 and the fins 52, are advantageously formed from a metallic material, generally aluminum, coated solder plating.

Ainsi, après mise en place des différents éléments constitutifs d'un échangeur de chaleur, ces éléments peuvent être placés dans un four de brasage pour réaliser le brasage, et donc la solidarisation des différents éléments, en une seule opération.Thus, after the various constituent elements of a heat exchanger have been put in place, these elements can be placed in a brazing furnace to perform brazing, and therefore the joining of the different elements, in a single operation.

Il est à noter que les parties repliées 32 des tubes forment des organes espaceurs (figure 3) qui contribuent également à la solidité mécanique de l'ensemble.It should be noted that the folded parts 32 of the tubes form spacer members (FIG. 3) which also contribute to the mechanical strength of the assembly.

Bien entendu, l'invention n'est pas limitée à la forme de réalisation décrite précédemment à titre d'exemple et il est possible d'envisager d'autres variantes.Of course, the invention is not limited to the embodiment described above by way of example and it is possible to envisage other variants.

Ainsi, le pliage du flan de tôle pourrait être effectué par rapport à une ligne de symétrie s'étendant parallèlement à la direction générale des branches des empreintes en U.Thus, the folding of the sheet blank could be carried out with respect to a line of symmetry extending parallel to the general direction of the branches of the U-shaped imprints.

L'invention est destinée tout particulièrement aux échangeurs de chaleur pour véhicules automobiles.The invention is particularly intended for heat exchangers for motor vehicles.

Claims (13)

Tube à circulation en U pour échangeur de chaleur, caractérisé en ce qu'il est obtenu à partir d'un flan en tôle métallique (10) replié sur lui-même à partir d'une ligne de pliage (L) de manière à constituer deux parties (18) réunies entre elles par brasage du côté d'une face interne (F) du flan, ces deux parties (18) du flan étant embouties à partir de la face interne (F) pour constituer deux empreintes en creux (16) en forme générale de (U) qui délimitent conjointement un canal en U ayant deux embouchures (24, 34) s'ouvrant sur un bord du flan plié.U-shaped circulation tube for heat exchanger, characterized in that it is obtained from a sheet metal blank (10) folded back on itself from a folding line (L) so as to constitute two parts (18) joined together by brazing on the side of an internal face (F) of the blank, these two parts (18) of the blank being stamped from the internal face (F) to form two indentations (16 ) in the general shape of (U) which jointly delimit a U-shaped channel having two mouths (24, 34) opening on an edge of the folded blank. Tube selon la revendication 1, caractérisé en ce que chacune des empreintes en (U) (16) est formée de deux branches (20) sensiblement parallèles réunies par un coude (22).Tube according to claim 1, characterized in that each of the indentations in (U) (16) is formed by two branches (20) substantially parallel joined by an elbow (22). Tube selon la revendication 2, caractérisé en ce que les coudes respectifs (22) des deux empreintes en (U)(16) sont situés symétriquement de part et d'autre de la ligne de pliage (L), le flan de tôle étant considéré à plat.Tube according to claim 2, characterized in that the respective elbows (22) of the two indentations in (U) (16) are located symmetrically on either side of the fold line (L), the sheet blank being considered flat. Tube selon l'une des revendications 1 à 3, caractérisé en ce que le flan de tôle (10) est en aluminium et est revêtu d'un alliage de brasure sur sa face interne (F).Tube according to one of claims 1 to 3, characterized in that the sheet blank (10) is made of aluminum and is coated with a brazing alloy on its internal face (F). Tube selon l'une des revendications 1 à 4, caractérisé en ce que le flan de tôle comporte une découpe (26) entre les deux embouchures (24) du canal en (U) pour séparer les deux embouchures.Tube according to one of claims 1 to 4, characterized in that the sheet blank has a cutout (26) between the two mouths (24) of the channel in (U) to separate the two mouths. Tube selon l'une des revendications 1 à 5, caractérisé en ce que le flan en tôle pliée (10) comprend en outre une partie d'extrémité (32) pliée sensiblement à angle droit pour former un organe espaceur.Tube according to one of claims 1 to 5, characterized in that the folded sheet blank (10) further comprises an end portion (32) folded substantially at right angles to form a spacer. Procédé de fabrication d'un tube à circulation en (U) pour échangeur de chaleur selon l'une des revendications 1 à 6,
caractérisé en ce qu'il comprend les opérations suivantes : - préparer un flan de tôle métallique (10); - emboutir le flan de tôle (10) pour former, à partir d'une face interne (F) du flan de tôle, deux empreintes en creux (16) en forme générale de (U) disposées symétriquement par rapport à une ligne de symétrie (L) partageant le flan (10) en deux parties (18); - replier le flan (10) sur lui-même de part et d'autre de cette ligne de symétrie (L) et rapprocher mutuellement les deux parties (18) du flan de tôle pour les mettre en contact du côté de la face interne (F); et - braser entre elles les deux parties (18) du flan de tôle (10), ce qui permet d'obtenir un canal en (U) délimité conjointement par les deux empreintes en (U)(16) et présentant deux embouchures (34) s'ouvrant sur un bord (14) du flan plié. Method of manufacturing a circulation tube in (U) for heat exchanger according to one of claims 1 to 6,
characterized in that it comprises the following operations: - prepare a sheet of metal sheet (10); - stamp the sheet blank (10) to form, from an internal face (F) of the sheet blank, two recesses (16) in general shape of (U) arranged symmetrically with respect to a line of symmetry (L) dividing the blank (10) into two parts (18); - fold the blank (10) on itself on either side of this line of symmetry (L) and bring the two parts (18) of the sheet blank together to bring them into contact on the side of the internal face ( F); and - braze together the two parts (18) of the sheet blank (10), which makes it possible to obtain a channel in (U) delimited jointly by the two imprints in (U) (16) and having two mouths (34) opening on an edge (14) of the folded blank. Procédé selon la revendication 7, caractérisé en ce que chacune des empreintes en (U)(16) est formée de deux branches (20) sensiblement parallèles réunies par un coude (22).Method according to claim 7, characterized in that each of the indentations in (U) (16) is formed by two substantially parallel branches (20) joined by an elbow (22). Procédé selon la revendication 8, caractérisé en ce que les coudes respectifs (22) des deux empreintes en (U)(16) sont situés symétriquement de part et d'autre de la ligne de symétrie (L).Method according to claim 8, characterized in that the respective elbows (22) of the two indentations in (U) (16) are located symmetrically on either side of the line of symmetry (L). Procédé selon l'une des revendications 8 et 9, caractérisé en ce que le flan de tôle (10) est en aluminium et est revêtu d'un alliage de brasure sur sa face interne (F).Method according to one of claims 8 and 9, characterized in that the sheet blank (10) is made of aluminum and is coated with a brazing alloy on its internal face (F). Procédé selon l'une des revendications 7 à 10, caractérisé en ce qu'il comprend en outre une opération consistant à découper le flan de tôle (10), dans l'épaisseur de chacune des deux parties (18) du flan de tôle, pour séparer les deux embouchures (24) du conduit en (U).Method according to one of claims 7 to 10, characterized in that it further comprises an operation consisting in cutting the sheet blank (10), in the thickness of each of the two parts (18) of the sheet blank, to separate the two mouths (24) of the conduit in (U). Procédé selon l'une des revendications 6 à 10, caractérisé en ce qu'il comprend en outre une opération supplémentaire consistant à plier sensiblement à angle droit une partie d'extrémité (32) du flan de tôle déjà plié pour former un organe espaceur.Method according to one of claims 6 to 10, characterized in that it further comprises an additional operation consisting in bending substantially at right angles an end portion (32) of the already folded sheet blank to form a spacer member. Echangeur de chaleur comprenant une multiplicité de tubes en (U) selon l'une des revendications 1 à 6 ou tel qu'obtenu par la mise en oeuvre du procédé selon l'une des revendications 7 à 12.Heat exchanger comprising a multiplicity of tubes in (U) according to one of claims 1 to 6 or as obtained by the implementation of the method according to one of claims 7 to 12.
EP96111920A 1995-07-31 1996-07-24 U-flow tube for heat exchanger and method for manufacturing same Withdrawn EP0757218A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9509312 1995-07-31
FR9509312A FR2737557B1 (en) 1995-07-31 1995-07-31 U-CIRCULATING TUBE FOR HEAT EXCHANGER AND MANUFACTURING METHOD THEREOF

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EP0757218A1 true EP0757218A1 (en) 1997-02-05

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CN (1) CN1147623A (en)
FR (1) FR2737557B1 (en)

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FR2770635A1 (en) * 1997-11-06 1999-05-07 Valeo Thermique Moteur Sa Brazed heat exchanger and manufacturing procedure
FR2771483A1 (en) * 1997-11-25 1999-05-28 Behr Gmbh & Co HEAT EXCHANGER FOR MOTOR VEHICLES
FR2789755A1 (en) * 1999-02-11 2000-08-18 Valeo Climatisation Heat exchanger for car has metallic tape stamped to form indentations defining two semi-channels put together to create complete U-shaped channel
FR2802628A1 (en) * 1999-12-17 2001-06-22 Behr Gmbh & Co Heat transmitter, particularly for road vehicle, has flat tubes through which first medium flows, with at least two part channels formed by dividing rib
JP2007232330A (en) * 2006-03-03 2007-09-13 T Rad Co Ltd Stacked heat exchanger
FR2986313A1 (en) * 2012-01-31 2013-08-02 Valeo Systemes Thermiques THERMAL EXCHANGER TUBE, HEAT EXCHANGER AND CORRESPONDING OBTAINING METHOD
EP2757336A3 (en) * 2013-01-18 2015-10-21 Robert Bosch Gmbh Heat exchanger with optimised heat transmission and heating device with such a heat exchanger
US20210381776A1 (en) * 2020-06-05 2021-12-09 Mahle International Gmbh Flat tube and heat exchanger with a flat tube

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JP4591213B2 (en) 2005-06-02 2010-12-01 トヨタ自動車株式会社 Piping with refrigerant inlet
CN103068143A (en) * 2012-12-19 2013-04-24 江苏安德信超导加速器科技有限公司 Continuous wave radio frequency four-level accelerator water cooling system and manufacturing method thereof
CN106595130A (en) * 2015-10-16 2017-04-26 浙江盾安人工环境股份有限公司 Plate header pipe and heat exchanger

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2770635A1 (en) * 1997-11-06 1999-05-07 Valeo Thermique Moteur Sa Brazed heat exchanger and manufacturing procedure
FR2771483A1 (en) * 1997-11-25 1999-05-28 Behr Gmbh & Co HEAT EXCHANGER FOR MOTOR VEHICLES
US6202741B1 (en) 1997-11-25 2001-03-20 Behr Gmbh & Co. Heat transfer device for a motor vehicle and method of making same
FR2789755A1 (en) * 1999-02-11 2000-08-18 Valeo Climatisation Heat exchanger for car has metallic tape stamped to form indentations defining two semi-channels put together to create complete U-shaped channel
FR2802628A1 (en) * 1999-12-17 2001-06-22 Behr Gmbh & Co Heat transmitter, particularly for road vehicle, has flat tubes through which first medium flows, with at least two part channels formed by dividing rib
JP2007232330A (en) * 2006-03-03 2007-09-13 T Rad Co Ltd Stacked heat exchanger
FR2986313A1 (en) * 2012-01-31 2013-08-02 Valeo Systemes Thermiques THERMAL EXCHANGER TUBE, HEAT EXCHANGER AND CORRESPONDING OBTAINING METHOD
WO2013113700A1 (en) * 2012-01-31 2013-08-08 Valeo Systemes Thermiques Heat exchanger tube, heat exchanger and corresponding production method
US9975168B2 (en) 2012-01-31 2018-05-22 Valeo Systemes Thermiques Heat exchanger tube, heat exchanger and corresponding production method
EP2757336A3 (en) * 2013-01-18 2015-10-21 Robert Bosch Gmbh Heat exchanger with optimised heat transmission and heating device with such a heat exchanger
US20210381776A1 (en) * 2020-06-05 2021-12-09 Mahle International Gmbh Flat tube and heat exchanger with a flat tube

Also Published As

Publication number Publication date
FR2737557B1 (en) 1997-09-12
CN1147623A (en) 1997-04-16
FR2737557A1 (en) 1997-02-07

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