EP0811820A1 - Flat tube with median spacer for heat exchanger - Google Patents

Flat tube with median spacer for heat exchanger Download PDF

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Publication number
EP0811820A1
EP0811820A1 EP97108742A EP97108742A EP0811820A1 EP 0811820 A1 EP0811820 A1 EP 0811820A1 EP 97108742 A EP97108742 A EP 97108742A EP 97108742 A EP97108742 A EP 97108742A EP 0811820 A1 EP0811820 A1 EP 0811820A1
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EP
European Patent Office
Prior art keywords
tube
strip
fold
region
regions
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.)
Granted
Application number
EP97108742A
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German (de)
French (fr)
Other versions
EP0811820B1 (en
Inventor
Carlos Martins
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 Thermique Moteur SA
Original Assignee
Valeo Thermique Moteur SA
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Publication date
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Publication of EP0811820A1 publication Critical patent/EP0811820A1/en
Application granted granted Critical
Publication of EP0811820B1 publication Critical patent/EP0811820B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2225/00—Reinforcing means
    • F28F2225/04—Reinforcing means for conduits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49391—Tube making or reforming

Definitions

  • the invention relates to a flat tube for the circulation of a fluid in a heat exchanger, in particular a radiator for cooling the drive motor of a motor vehicle, formed by folding, in its longitudinal direction, a strip of sheet of which a first face, defining the outer surface of the tube, is coated with a brazing material, this tube comprising first and second opposite main walls, substantially planar and parallel, connected together by two complementary walls so as to form a closed profile, the first main wall being formed from a median region of the width of the strip and the second main wall from two intermediate regions located on either side of the median region, which are substantially juxtaposed in the same plane, and two marginal regions of the strip, respectively adjacent to said intermediate regions, being folded back t these towards the inside of the tube and joined by brazing to the internal face of the middle region.
  • Such tubes are arranged in one or more rows, the tubes of the same row being mutually aligned parallel to their thickness, that is to say perpendicular to their main walls.
  • Each tube connects two fluid boxes together so as to allow the circulation of the fluid in one or more passes between the fluid boxes, the fluid thus exchanging heat with an air flow passing through the bundle of tubes and sweeping the surface outside of each tube.
  • the marginal regions of the strip have a width corresponding to the internal thickness of the tube and are bent at right angles to the intermediate regions to rest by their free edge on the internal face of the first main wall. These marginal regions, whose coatings of brazing material are then turned towards each other, are joined by brazing, to each other and to the first main wall, forming a spacer for reinforcing the tube and dividing the interior of the latter into two separate parallel conduits.
  • Figure 3 partially shows a tube in which one 114 of the marginal regions, bent at right angles to the adjacent region 112 of the strip, normally rests on the inner face of the first main wall 107, while the other, shorter, marginal region 113 remains at a distance from the wall 107.
  • the region 113 therefore does not participate in the strengthening of the tube.
  • it is difficult to ensure the coplanarity of the adjacent region 111 with the region 112 to form the second main wall of the tube.
  • the region 113 has the desired length, but the region 114 is too long and is positioned obliquely with respect to the main walls 107 and 111, 112.
  • the regions 113 and 114 are therefore not mutually contiguous and do not provide not the desired reinforcement of the tube. Leakage can also occur.
  • the object of the invention is to remedy these drawbacks, and to allow the production of a tube of determined size from a strip whose width can vary to a certain extent, and correspondingly to produce tubes of some size. little different from the same bandwidth.
  • the invention relates in particular to a tube of the kind defined in the introduction, and provides that the first main wall is formed by two zones of the median region located laterally on either side of a fold turned towards the inside of the tube, on which are supported by said marginal regions which are folded substantially at 180 °.
  • Figure 1 shows in cross section a flat tube 1 produced by bending the sheet metal strip 2 shown in Figure 5.
  • the face of the strip 2 facing down in Figure 5 carries a coating 3 of a material of soldering, which covers the entire periphery of the cross section of the tube 1.
  • Halfway down the strip 2 is formed a fold 4 which penetrates inside the tube. In cross section, this fold has a U-shape whose branches 5 and 6 are mutually joined and are folded at right angles to the adjacent regions 7 and 8 of the strip.
  • the regions 7 and 8 extend in the same plane to form a first main wall of the tube. They are connected respectively by regions 9 and 10, curved in half-cylinders, to other flat regions 11 and 12 which form the second main wall of the tube, parallel to the wall 7, 8.
  • the periphery of the tube is formed by the two main faces 7, 8 and 11, 12, flat and parallel, and by two curved complementary walls 9 and 10.
  • the marginal regions 13 and 14 of the strip are bent 180 ° relative to these inside the tube, thus forming, with these latter regions, respective U-shaped profiles, the bottoms 15 and 16 are in mutual contact by the covering 3 and each in contact with the bottom 17 of the U formed by the fold 4.
  • a cavity 18 of curvilinear triangular cross section which will be filled with material of soldering during the fusion of this one.
  • the melting of the brazing material covering the faces of the arms 5 and 6 facing one another will stiffen the fold 4. This gives excellent resistance to the spacer formed by the fold 4 and by the marginal regions 13 and 14, and perfect sealing of the tube at the connection between the three bottoms.
  • the fact that the sealing zone is adjacent to the outside of the tube also facilitates the brazing preparation operations (degreasing, fluxing, steaming), as well as the appearance control before brazing.
  • the tube of FIG. 1 is rigorously symmetrical with respect to the plane P passing on the one hand between the branches 5 and 6, on the other hand between the bottoms 15 and 16.
  • This symmetry is broken, in the case of the tube of FIG. 2, by the fact that the marginal region 14 is wider than the marginal region 13, the starting strip itself being a little wider than that shown in FIG. 5. It can be seen that this increase in width in no way affects the external dimensions of the finished tube, nor the relative shape and position of the three funds of U 15, 16 and 17 and therefore the quality of their connection.
  • the fold 4 is first formed by triple longitudinal folding of the strip.
  • the marginal regions 13 and 14 are then folded 180 ° relative to the adjacent regions 11 and 12, according to the arrows F1 in FIG. 5.
  • the regions 11 and 12 are raised by rotating them 180 ° relative to the regions 7 and 8 respectively, according to the arrows F2 of FIG. 5, by rolling regions 9 and 10 in half-cylinders.
  • the folding of the marginal regions 13 and 14 is carried out in such a way that the bottoms 15 and 16 are formed at a distance predetermined plane P defined by the branches 5 and 6, whereby any excess or defect in the width of the strip 2 affects the width of the marginal regions 13 and 14 and not on the outer dimensions of the tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

The tube (1) is formed by folding longitudinally a sheet steel strip whose face forming the tube external surface is coated with a brazing material (3). The tube has first (7,8) and second (11,12) opposite main walls connected by two complementary walls (9,10). The first main wall is formed from two zones of the median region of the strip width either side a fold (4) turned towards the tube interior. The second main wall is formed from two intermediate regions and two end regions (13,14) of the strip. The fold has a transverse U section whose side by side branches (5,6) extend perpendicularly to the main walls and form a reinforcing strut. The end regions support the bottom of the U. Each end region is folded into a U relative to the adjacent intermediate region and is supported by the bottom (15,16) of its U on the fold.

Description

L'invention concerne un tube plat pour la circulation d'un fluide dans un échangeur de chaleur, notamment un radiateur de refroidissement du moteur d'entraînement d'un véhicule automobile, formé par pliage, selon sa direction longitudinale, d'une bande de tôle dont une première face, définissant la surface extérieure du tube, est revêtue d'un matériau de brasage, ce tube comprenant des première et seconde parois principales opposées, sensiblement planes et parallèles, raccordées entre elles par deux parois complémentaires de façon à former un profil fermé, la première paroi principale étant formée à partir d'une région médiane de la largeur de la bande et la seconde paroi principale à partir de deux régions intermédiaires situées de part et d'autre de la région médiane, qui viennent se juxtaposer sensiblement dans un même plan, et deux régions marginales de la bande, respectivement adjacentes auxdites régions intermédiaires, étant repliées par rapport à celles-ci vers l'intérieur du tube et solidarisées par brasage à la face intérieure de la région médiane.The invention relates to a flat tube for the circulation of a fluid in a heat exchanger, in particular a radiator for cooling the drive motor of a motor vehicle, formed by folding, in its longitudinal direction, a strip of sheet of which a first face, defining the outer surface of the tube, is coated with a brazing material, this tube comprising first and second opposite main walls, substantially planar and parallel, connected together by two complementary walls so as to form a closed profile, the first main wall being formed from a median region of the width of the strip and the second main wall from two intermediate regions located on either side of the median region, which are substantially juxtaposed in the same plane, and two marginal regions of the strip, respectively adjacent to said intermediate regions, being folded back t these towards the inside of the tube and joined by brazing to the internal face of the middle region.

De tels tubes sont disposés en une ou plusieurs rangées, les tubes d'une même rangées étant mutuellement alignés parallèlement à leur épaisseur, c'est-à-dire perpendiculairement à leurs parois principales. Chaque tube relie entre elles deux boîtes à fluide de façon à permettre la circulation du fluide en une ou plusieurs passes entre les boîtes à fluide, le fluide échangeant ainsi de la chaleur avec un flux d'air traversant le faisceau de tubes et balayant la surface extérieure de chaque tube.Such tubes are arranged in one or more rows, the tubes of the same row being mutually aligned parallel to their thickness, that is to say perpendicular to their main walls. Each tube connects two fluid boxes together so as to allow the circulation of the fluid in one or more passes between the fluid boxes, the fluid thus exchanging heat with an air flow passing through the bundle of tubes and sweeping the surface outside of each tube.

Dans un tube connu de ce genre, les régions marginales de la bande ont une largeur correspondant à l'épaisseur intérieure du tube et sont pliées à angle droit par rapport aux régions intermédiaires pour s'appuyer par leur tranche libre sur la face intérieure de la première paroi principale. Ces régions marginales, dont les revêtements de matériau de brasage sont alors tournés l'un vers l'autre, sont solidarisées par brasage, entre elles et à la première paroi principale, formant une entretoise de renforcement du tube et divisant l'intérieur de celui-ci en deux conduits séparés parallèles.In a known tube of this kind, the marginal regions of the strip have a width corresponding to the internal thickness of the tube and are bent at right angles to the intermediate regions to rest by their free edge on the internal face of the first main wall. These marginal regions, whose coatings of brazing material are then turned towards each other, are joined by brazing, to each other and to the first main wall, forming a spacer for reinforcing the tube and dividing the interior of the latter into two separate parallel conduits.

Il est clair que, pour un tube ayant la structure qui vient d'être décrite, la forme et les dimensions de la section transversale du tube imposent la largeur de la bande de départ. Il n'est donc pas possible à partir d'une même bande, à moins de la recouper, d'obtenir des tubes de tailles différentes. De plus, la largeur voulue de la bande doit être respectée avec précision, ce qui augmente son coût de réalisation ou entraîne des rebuts.It is clear that, for a tube having the structure which has just been described, the shape and the dimensions of the cross section of the tube dictate the width of the starting strip. It is therefore not possible from the same strip, unless it is cut, to obtain tubes of different sizes. In addition, the desired width of the strip must be respected with precision, which increases its cost of production or causes scrap.

La figure 3 montre partiellement un tube dans lequel l'une 114 des régions marginales, pliée à angle droit par rapport à la région adjacente 112 de la bande, s'appuie normalement sur la face intérieure de la première paroi principale 107, tandis que l'autre région marginale 113, plus courte, reste à distance de la paroi 107. La région 113 ne participe donc pas au renforcement du tube. De plus, il est difficile d'assurer la coplanarité de la région adjacente 111 avec la région 112 pour former la seconde paroi principale du tube.Figure 3 partially shows a tube in which one 114 of the marginal regions, bent at right angles to the adjacent region 112 of the strip, normally rests on the inner face of the first main wall 107, while the the other, shorter, marginal region 113 remains at a distance from the wall 107. The region 113 therefore does not participate in the strengthening of the tube. In addition, it is difficult to ensure the coplanarity of the adjacent region 111 with the region 112 to form the second main wall of the tube.

A la figure 4, la région 113 possède la longueur voulue, mais la région 114 est trop longue et se positionne obliquement par rapport aux parois principales 107 et 111, 112. Les régions 113 et 114 ne sont donc pas mutuellement accolées et n'assurent pas le renforcement voulu du tube. Un défaut d'étanchéité peut également se produire.In FIG. 4, the region 113 has the desired length, but the region 114 is too long and is positioned obliquely with respect to the main walls 107 and 111, 112. The regions 113 and 114 are therefore not mutually contiguous and do not provide not the desired reinforcement of the tube. Leakage can also occur.

Le but de l'invention est de remédier à ces inconvénients, et de permettre la réalisation d'un tube de taille déterminée à partir d'une bande dont la largeur peut varier dans une certaine mesure, et corrélativement de réaliser des tubes de tailles quelque peu différentes à partie d'une même largeur de bande.The object of the invention is to remedy these drawbacks, and to allow the production of a tube of determined size from a strip whose width can vary to a certain extent, and correspondingly to produce tubes of some size. little different from the same bandwidth.

L'invention vise notamment un tube du genre défini en introduction, et prévoit que la première paroi principale est formée par deux zones de la région médiane situées latéralement de part et d'autre d'un repli tourné vers l'intérieur du tube, sur lequel s'appuient lesdites régions marginales qui sont repliées sensiblement à 180°.The invention relates in particular to a tube of the kind defined in the introduction, and provides that the first main wall is formed by two zones of the median region located laterally on either side of a fold turned towards the inside of the tube, on which are supported by said marginal regions which are folded substantially at 180 °.

Des caractéristiques optionnelles de l'invention, complémentaires ou alternatives, sont énoncées ci-après:

  • Ledit repli est placé à mi-largeur de la première paroi principale du tube.
  • Ledit repli présente une section transversale en U dont les branches sont mutuellement accolées et s'étendent perpendiculairement auxdites parois principales, lesdites régions marginales s'appuyant sur le fond du U.
  • Chaque région marginale est repliée en U par rapport à la région intermédiaire adjacente et s'appuie par le fond de son U sur ledit repli.
  • Le fond du U de chaque région marginale est en contact avec celui de l'autre région marginale et avec ledit repli, ces trois éléments définissant entre eux une cavité propre à se remplir de matériau de brasage lors de la fusion du revêtement présent sur les régions marginales.
  • Chaque région marginale est repliée à plat sur la région intermédiaire adjacente, la région marginale et la région intermédiaire étant en contact mutuel par la seconde face de la bande.
  • Les parois complémentaires ont un profil courbe convexe.
  • Les parois complémentaires ont un profil sensiblement semi-circulaire.
Optional, complementary or alternative features of the invention are set out below:
  • Said fold is placed at half the width of the first main wall of the tube.
  • Said fold has a U-shaped cross section whose branches are mutually contiguous and extend perpendicular to said main walls, said marginal regions resting on the bottom of the U.
  • Each marginal region is folded in a U with respect to the adjacent intermediate region and is supported by the bottom of its U on said fold.
  • The bottom of the U of each marginal region is in contact with that of the other marginal region and with said fold, these three elements defining between them a cavity suitable for filling with brazing material during the melting of the coating present on the regions marginal.
  • Each marginal region is folded flat on the adjacent intermediate region, the marginal region and the intermediate region being in mutual contact by the second face of the strip.
  • The complementary walls have a convex curved profile.
  • The complementary walls have a substantially semi-circular profile.

L'invention a également pour objet un procédé pour la réalisation d'un tube tel que défini ci-dessus, comportant des étapes successives au cours desquelles:

  • a) on plie ladite bande longitudinalement pour former ledit repli, le reste de la bande s'étendant sensiblement selon un plan de part et d'autre du repli;
  • b) on replie les régions marginales de la bande, du côté dudit plan où se trouve le repli, à une distance prédéterminée de celui-ci dans la direction de la largeur de la bande; et
  • c) on recourbe la bande, à une distance prédéterminée de chaque côté du repli, pour définir les parois complémentaires du tube, lesdites régions intermédiaires pivotant sensiblement de 180° pour amener les régions marginales de la bande en contact avec le repli.
The invention also relates to a method for producing a tube as defined above, comprising successive steps during which:
  • a) folding said strip longitudinally to form said fold, the rest of the strip extending substantially in a plane on either side of the fold;
  • b) the marginal regions of the strip are folded back, on the side of said plane where the fold is located, at a predetermined distance from the latter in the direction of the width of the strip; and
  • c) the strip is bent, at a predetermined distance on each side of the fold, to define the complementary walls of the tube, said intermediate regions pivoting substantially 180 ° to bring the marginal regions of the strip into contact with the fold.

Les caractéristiques et avantages de l'invention seront exposés plus en détail dans la description ci-après, en se référant aux dessins annexés, sur lesquels:

  • la figure 1 est une vue partielle en coupe transversale d'un tube selon l'invention, avant brasage;
  • la figure 2 représente la partie médiane de la coupe transversale d'un tube semblable à celui de la figure 1, réalisé à partir d'une bande un peu plus large;
  • les figures 3 et 4 sont des vues analogues à la figure 2, relatives à des tubes selon l'état de la technique; et
  • la figure 5 est une vue partielle en coupe transversale de la bande utilisée pour réaliser le tube de la figure 1, en cours de pliage.
The characteristics and advantages of the invention will be explained in more detail in the description below, with reference to the accompanying drawings, in which:
  • Figure 1 is a partial cross-sectional view of a tube according to the invention, before brazing;
  • 2 shows the middle part of the cross section of a tube similar to that of Figure 1, made from a slightly wider strip;
  • Figures 3 and 4 are views similar to Figure 2, relating to tubes according to the prior art; and
  • Figure 5 is a partial cross-sectional view of the strip used to make the tube of Figure 1, during folding.

La figure 1 représente en coupe transversale un tube plat 1 réalisé par pliage de la bande de tôle métallique 2 représentée à la figure 5. La face de la bande 2 tournée vers le bas à la figure 5 porte un revêtement 3 d'un matériau de brasage, qui recouvre toute la périphérie de la section transversale du tube 1. A mi-largeur de la bande 2 est formé un repli 4 qui pénètre à l'intérieur du tube. En section transversale, ce repli présente une forme en U dont les branches 5 et 6 sont mutuellement accolées et sont pliées à angle droit par rapport aux régions adjacentes 7 et 8 de la bande. Sur la figure 1, les régions 7 et 8 s'étendent dans un même plan pour former une première paroi principale du tube. Elles se raccordent respectivement par des régions 9 et 10, incurvées en demi-cylindres, à d'autres régions planes 11 et 12 qui forment la seconde paroi principale du tube, parallèle à la paroi 7, 8. Ainsi, la périphérie du tube est formée par les deux faces principales 7, 8 et 11, 12, planes et parallèles, et par deux parois complémentaires incurvées 9 et 10.Figure 1 shows in cross section a flat tube 1 produced by bending the sheet metal strip 2 shown in Figure 5. The face of the strip 2 facing down in Figure 5 carries a coating 3 of a material of soldering, which covers the entire periphery of the cross section of the tube 1. Halfway down the strip 2 is formed a fold 4 which penetrates inside the tube. In cross section, this fold has a U-shape whose branches 5 and 6 are mutually joined and are folded at right angles to the adjacent regions 7 and 8 of the strip. In FIG. 1, the regions 7 and 8 extend in the same plane to form a first main wall of the tube. They are connected respectively by regions 9 and 10, curved in half-cylinders, to other flat regions 11 and 12 which form the second main wall of the tube, parallel to the wall 7, 8. Thus, the periphery of the tube is formed by the two main faces 7, 8 and 11, 12, flat and parallel, and by two curved complementary walls 9 and 10.

Les régions marginales 13 et 14 de la bande, adjacentes respectivement aux régions 11 et 12, sont pliées à 180° par rapport à celles-ci à l'intérieur du tube, formant ainsi, avec ces dernières régions, des profils en U respectifs dont les fonds 15 et 16 sont en contact mutuel par le revêtement 3 et chacun en contact avec le fond 17 du U formé par le repli 4. Il subsiste entre ces trois fonds une cavité 18 de section transversale triangulaire curviligne, qui se remplira de matériau de brasage lors de la fusion de celui-ci. En même temps, la fusion du matériau de brasage recouvrant les faces des branches 5 et 6 tournées l'une vers l'autre assurera la rigidification du repli 4. On obtient ainsi une excellent tenue de l'entretoise formée par le repli 4 et par les régions marginales 13 et 14, et une étanchéité parfaite du tube au niveau de la liaison entre les trois fonds. Le fait que la zone d'étanchéité est adjacente à l'extérieur du tube facilite en outre les opérations de préparation au brasage (dégraissage, fluxage, étuvage), ainsi que le contrôle d'aspect avant brasage.The marginal regions 13 and 14 of the strip, adjacent respectively to regions 11 and 12, are bent 180 ° relative to these inside the tube, thus forming, with these latter regions, respective U-shaped profiles, the bottoms 15 and 16 are in mutual contact by the covering 3 and each in contact with the bottom 17 of the U formed by the fold 4. There remains between these three bottoms a cavity 18 of curvilinear triangular cross section, which will be filled with material of soldering during the fusion of this one. At the same time, the melting of the brazing material covering the faces of the arms 5 and 6 facing one another will stiffen the fold 4. This gives excellent resistance to the spacer formed by the fold 4 and by the marginal regions 13 and 14, and perfect sealing of the tube at the connection between the three bottoms. The fact that the sealing zone is adjacent to the outside of the tube also facilitates the brazing preparation operations (degreasing, fluxing, steaming), as well as the appearance control before brazing.

Le tube de la figure 1 est rigoureusement symétrique par rapport au plan P passant d'une part entre les branches 5 et 6, d'autre part entre les fonds 15 et 16. Cette symétrie est rompue, dans le cas du tube de la figure 2, par le fait que la région marginale 14 est plus large que la région marginale 13, la bande de départ étant elle-même un peu plus large que celle représentée à la figure 5. On voit que cette augmentation de largeur n'affecte en rien les dimensions extérieures du tube terminé, ni la forme et la position relatives des trois fonds de U 15, 16 et 17 et par conséquent la qualité de leur liaison.The tube of FIG. 1 is rigorously symmetrical with respect to the plane P passing on the one hand between the branches 5 and 6, on the other hand between the bottoms 15 and 16. This symmetry is broken, in the case of the tube of FIG. 2, by the fact that the marginal region 14 is wider than the marginal region 13, the starting strip itself being a little wider than that shown in FIG. 5. It can be seen that this increase in width in no way affects the external dimensions of the finished tube, nor the relative shape and position of the three funds of U 15, 16 and 17 and therefore the quality of their connection.

Avantageusement, pour réaliser le tube selon l'invention, on forme tout d'abord le repli 4 par un triple pliage longitudinal de la bande. On plie ensuite les régions marginales 13 et 14 à 180° par rapport aux régions adjacentes 11 et 12, selon les flèches F1 de la figure 5. Puis, on relève les régions 11 et 12 en les faisant pivoter de 180° par rapport aux régions 7 et 8 respectivement, selon les flèches F2 de la figure 5, en roulant en demi-cylindres les régions 9 et 10. Le pliage des régions marginales 13 et 14 est effectué de telle façon que les fonds 15 et 16 soient formés à une distance prédéterminée du plan P défini par les branches 5 et 6, grâce à quoi tout excès ou tout défaut dans la largeur de la bande 2 se répercute sur la largeur des régions marginales 13 et 14 et non sur les dimensions extérieures du tube.Advantageously, to produce the tube according to the invention, the fold 4 is first formed by triple longitudinal folding of the strip. The marginal regions 13 and 14 are then folded 180 ° relative to the adjacent regions 11 and 12, according to the arrows F1 in FIG. 5. Then, the regions 11 and 12 are raised by rotating them 180 ° relative to the regions 7 and 8 respectively, according to the arrows F2 of FIG. 5, by rolling regions 9 and 10 in half-cylinders. The folding of the marginal regions 13 and 14 is carried out in such a way that the bottoms 15 and 16 are formed at a distance predetermined plane P defined by the branches 5 and 6, whereby any excess or defect in the width of the strip 2 affects the width of the marginal regions 13 and 14 and not on the outer dimensions of the tube.

Claims (9)

Tube plat (1) pour la circulation d'un fluide dans un échangeur de chaleur, notamment un radiateur de refroidissement du moteur d'entraînement d'un véhicule automobile, formé par pliage, selon sa direction longitudinale, d'une bande de tôle (2) dont une première face, définissant la surface extérieure du tube, est revêtue d'un matériau de brasage (3), ce tube comprenant des première (7, 8) et seconde (11, 12) parois principales opposées, sensiblement planes et parallèles, raccordées entre elles par deux parois complémentaires (9, 10) de façon à former un profil fermé, la première paroi principale étant formée à partir d'une région médiane (7, 4, 8) de la largeur de la bande et la seconde paroi principale à partir de deux régions intermédiaires (11, 12) situées de part et d'autre de la région médiane, qui viennent se juxtaposer sensiblement dans un même plan, et deux régions marginales (13, 14) de la bande, respectivement adjacentes auxdites régions intermédiaires, étant repliées par rapport à celles-ci vers l'intérieur du tube et solidarisées par brasage à la face intérieure de la région médiane, caractérisé en ce que la première paroi principale est formée par deux zones (7, 8) de la région médiane situées latéralement de part et d'autre d'un repli (4) tourné vers l'intérieur du tube, sur lequel s'appuient lesdites régions marginales qui sont repliées sensiblement à 180°.Flat tube (1) for the circulation of a fluid in a heat exchanger, in particular a radiator for cooling the drive motor of a motor vehicle, formed by folding, in its longitudinal direction, a strip of sheet metal ( 2) of which a first face, defining the outer surface of the tube, is coated with a brazing material (3), this tube comprising first (7, 8) and second (11, 12) opposite main walls, substantially planar and parallel, connected together by two complementary walls (9, 10) so as to form a closed profile, the first main wall being formed from a central region (7, 4, 8) of the width of the strip and the second main wall from two intermediate regions (11, 12) located on either side of the middle region, which come to juxtapose substantially in the same plane, and two marginal regions (13, 14) of the strip, respectively adjacent to said inte regions intermediate, being folded relative to them towards the inside of the tube and joined by brazing to the internal face of the median region, characterized in that the first main wall is formed by two zones (7, 8) of the region median located laterally on either side of a fold (4) facing the inside of the tube, on which said marginal regions are supported which are folded substantially at 180 °. Tube selon la revendication 1, caractérisé en ce que ledit repli est placé à mi-largeur de la première paroi principale du tube.Tube according to claim 1, characterized in that the said fold is placed at half the width of the first main wall of the tube. Tube selon l'une des revendications 1 et 2, caractérisé en ce que ledit repli présente une section transversale en U dont les branches (5, 6) sont mutuellement accolées et s'étendent perpendiculairement auxdites parois principales, lesdites régions marginales s'appuyant sur le fond du U.Tube according to either of Claims 1 and 2, characterized in that the said fold has a U-shaped cross section, the branches (5, 6) of which are mutually contiguous and extend perpendicular to the said main walls, the said marginal regions resting on the bottom of the U. Tube selon l'une des revendications précédentes, caractérisé en ce que chaque région marginale (13, 14) est repliée en U par rapport à la région intermédiaire adjacente et s'appuie par le fond (15, 16) de son U sur ledit repli.Tube according to one of the preceding claims, characterized in that each marginal region (13, 14) is folded in a U with respect to the adjacent intermediate region and is supported by the bottom (15, 16) of its U on said fold. Tube selon la revendication 4, caractérisé en ce que le fond (15, 16) du U de chaque région marginale est en contact avec celui de l'autre région marginale et avec ledit repli (4), ces trois éléments définissant entre eux une cavité (18) propre à se remplir de matériau de brasage lors de la fusion du revêtement présent sur les régions marginales.Tube according to claim 4, characterized in that the bottom (15, 16) of the U of each marginal region is in contact with that of the other marginal region and with said fold (4), these three elements defining between them a cavity (18) suitable for filling with brazing material during the melting of the coating present on the marginal regions. Tube selon l'une des revendications 4 et 5, caractérisé en ce que chaque région marginale est repliée à plat sur la région intermédiaire adjacente, la région marginale et la région intermédiaire étant en contact mutuel par la seconde face de la bande.Tube according to one of claims 4 and 5, characterized in that each marginal region is folded flat on the adjacent intermediate region, the marginal region and the intermediate region being in mutual contact by the second face of the strip. Tube selon l'une des revendications précédentes, caractérisé en ce que les parois complémentaires (9, 10) ont un profil courbe convexe.Tube according to one of the preceding claims, characterized in that the complementary walls (9, 10) have a convex curved profile. Tube selon la revendication 7, caractérisé en ce que les parois complémentaires ont un profil sensiblement semi-circulaire.Tube according to claim 7, characterized in that the complementary walls have a substantially semi-circular profile. Procédé pour la réalisation d'un tube selon l'une des revendications précédentes, comportant des étapes successives au cours desquelles: a) on plie ladite bande (2) longitudinalement pour former ledit repli (4), le reste de la bande s'étendant sensiblement selon un plan de part et d'autre du repli; b) on replie les régions marginales de la bande (13, 14), du côté dudit plan où se trouve le repli, à une distance prédéterminée de celui-ci dans la direction de la largeur de la bande; et c) on recourbe la bande, à une distance prédéterminée de chaque côté du repli, pour définir les parois complémentaires (9, 10) du tube, lesdites régions intermédiaires pivotant sensiblement de 180° pour amener les régions marginales de la bande en contact avec le repli. Method for producing a tube according to one of the preceding claims, comprising successive stages during which: a) folding said strip (2) longitudinally to form said fold (4), the rest of the strip extending substantially in a plane on either side of the fold; b) the marginal regions of the strip (13, 14) are folded back, on the side of said plane where the fold is located, at a predetermined distance from the latter in the direction of the width of the strip; and c) the strip is bent, at a predetermined distance on each side of the fold, to define the complementary walls (9, 10) of the tube, said intermediate regions pivoting substantially 180 ° to bring the marginal regions of the strip into contact with the withdrawal.
EP97108742A 1996-06-05 1997-06-02 Flat tube with median spacer for heat exchanger Expired - Lifetime EP0811820B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9606932A FR2749648B1 (en) 1996-06-05 1996-06-05 FLAT TUBE WITH MEDIUM SPACER FOR HEAT EXCHANGER
FR9606932 1996-06-05

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EP0811820A1 true EP0811820A1 (en) 1997-12-10
EP0811820B1 EP0811820B1 (en) 2000-12-06

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US (1) US5765634A (en)
EP (1) EP0811820B1 (en)
KR (1) KR980000694A (en)
CN (1) CN1176376A (en)
AR (1) AR007390A1 (en)
BR (1) BR9703474A (en)
DE (1) DE69703638T2 (en)
FR (1) FR2749648B1 (en)

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FR2786559A1 (en) * 1998-11-30 2000-06-02 Valeo Thermique Moteur Sa Heat exchanger for motor vehicle has parallel tubes each formed of folded and brazed metal sheets forming flanges for contact between tubes
FR2810729A1 (en) * 2000-06-22 2001-12-28 Valeo Thermique Moteur Sa Heat exchanger tube for car radiator comprises metal strip which has external layer of brazing and is bent inwards to form tube with side walls whose ends rest against inner surface of sheet and have brazed coating
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Also Published As

Publication number Publication date
DE69703638T2 (en) 2001-05-10
BR9703474A (en) 1998-09-01
CN1176376A (en) 1998-03-18
AR007390A1 (en) 1999-10-27
US5765634A (en) 1998-06-16
EP0811820B1 (en) 2000-12-06
FR2749648A1 (en) 1997-12-12
KR980000694A (en) 1998-03-30
MX9704142A (en) 1998-06-28
DE69703638D1 (en) 2001-01-11
FR2749648B1 (en) 1998-09-04

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