WO2013113698A1 - Heat exchanger tube, heat exchanger and corresponding production method - Google Patents

Heat exchanger tube, heat exchanger and corresponding production method Download PDF

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Publication number
WO2013113698A1
WO2013113698A1 PCT/EP2013/051689 EP2013051689W WO2013113698A1 WO 2013113698 A1 WO2013113698 A1 WO 2013113698A1 EP 2013051689 W EP2013051689 W EP 2013051689W WO 2013113698 A1 WO2013113698 A1 WO 2013113698A1
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WO
WIPO (PCT)
Prior art keywords
tube
heat exchanger
metal strip
thickness
inner spacer
Prior art date
Application number
PCT/EP2013/051689
Other languages
French (fr)
Inventor
Christian Riondet
Jean-Marc Lesueur
Kevin Gahon
Romain DEHAINE
Damien Burgaud
Yann Pichenot
Original Assignee
Valeo Systemes Thermiques
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 Systemes Thermiques filed Critical Valeo Systemes Thermiques
Publication of WO2013113698A1 publication Critical patent/WO2013113698A1/en

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/151—Making tubes with multiple passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/22—Making finned or ribbed tubes by fixing strip or like material to tubes
    • B21C37/225—Making finned or ribbed tubes by fixing strip or like material to tubes longitudinally-ribbed tubes
    • 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/08—Bending by altering the thickness of part of the cross-section of the work
    • B21D11/085—Bending by altering the thickness of part of the cross-section of the work by locally stretching or upsetting
    • 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
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements

Definitions

  • the invention relates to a method for obtaining a heat exchanger tube, in particular for motor vehicles, a heat exchanger tube and a heat exchanger comprising a bundle of such heat exchanger tubes.
  • the heat exchangers comprise a bundle of parallel heat exchanger tubes and two manifolds having orifices in which are connected the corresponding ends of the heat exchanger tubes, by brazing.
  • the collectors are respectively provided with an inlet and an outlet for a fluid, for example a cooling fluid, passing through the heat exchanger. The fluid therefore enters the heat exchanger tubes via the collectors.
  • heat exchanger tubes are obtained from a metal foil coil which, as a result of its unwinding, is progressively shaped to the desired cross section by specific folding tools. After folding, the longitudinal edges of the sheet are joined to create one or more housings in the heat exchanger tube. The heat exchanger tube can then be cut to the desired length, in sections corresponding to the final heat exchanger tubes.
  • a parameter to take into account when sizing the heat exchanger tubes is the mechanical stress in service. Indeed, the heat exchanger tubes are subjected in particular to the pressure of the circuit of which they are part.
  • an inner interlayer inside the tubes.
  • This inner interlayer for example of undulating shape, disrupts the flow of fluid in the tubes by increasing the exchange surface.
  • This inner spacer is also used to modify the internal pressure of the tubes.
  • To arrange the inner spacer in the heat exchanger tube without losing the mechanical strength provided by the internal partition it is possible, for example, to insert two internal spacers, that is to say an inner spacer per fluid circulation channel. .
  • the constructor may wish to use only one internal interlayer traversing the two channels. In this case, one solution is to reduce the height of the internal partition, a height corresponding to the thickness of the inner spacer.
  • the internal spacers can have different thicknesses according to the needs of the car manufacturer, resulting in as many changes in the height of the internal partition.
  • the subject of the invention is a process for obtaining a tube heat exchanger, said tube having two circulation channels and an inner interlayer arranged in the two circulation channels, said channels being separated by an internal partition formed by joining opposite edges of a metal strip, said opposite edges respectively having a end, said spacer being interposed between the ends and the inner wall of the facing tube at a junction zone, said method comprising the following steps:
  • the metal strip and / or the internal interlayer are thinned at the junction zone,
  • the metal strip is folded to form said tube with two circulation channels by joining the opposite edges at the junction zone.
  • the metal strip is thinned with a thickness less than or equal to the thickness of the inner spacer.
  • the inner interlayer is thinned up to 75% of its original thickness.
  • the tube can be compressed after the folding step in a further step.
  • the ends, the inner spacer and the inner wall of the metal strip facing each other are brazed together.
  • the invention also relates to a heat exchanger tube having two circulation channels and an inner spacer arranged in the two circulation channels, said channels being separated by an internal partition formed by joining the opposite edges of a metal strip, said opposite edges respectively having an end, and said inner spacer being interposed between the ends and the inner wall of the facing tube at a junction zone, the inner wall and / or the inner interlayer having a thinning at the level of the junction area.
  • the thinning of the metal strip and / or the inner spacer is less than or equal to the thickness of the inner spacer.
  • the thickness of the unthinned wall is between 0.15 mm and 0.35 mm, preferably between 0.20 mm and 0.27 mm.
  • the unthinned thickness of the inner spacer is between 30 ⁇ and 200 ⁇ , preferably between 50 ⁇ to 70 ⁇ .
  • the subject of the invention is also a heat exchanger, in particular for a motor vehicle, comprising a bundle of heat exchanger tubes according to any one of the preceding claims.
  • the main advantage of the invention is that it makes it possible to adapt the shape of a heat exchanger tube to insert an internal spacer without having to modify the height of its internal partition.
  • the method described is simple and inexpensive and allows the tube to maintain good mechanical strength.
  • FIG. 1 partially and schematically represents a heat exchanger
  • FIG. 2 represents a flowchart illustrating the steps of the method of manufacturing the heat exchanger tube
  • FIG. 3a schematically illustrates a metal strip serving for the formation of the heat exchanger tube, FIG. 3a not being representative of the dimensions of the strip for the formation of the heat exchanger tube,
  • FIG. 3b schematically illustrates the metal strip of FIG. 3a thinned
  • FIG. 3c schematically illustrates the metal strip of FIG. 3b folded
  • FIG. 4a represents a perspective view of the heat exchanger tube obtained by the process described in FIG.
  • FIG. 4b shows a partial view of a cross-section of the heat exchanger tube obtained according to a variant of the method described in FIG. 2,
  • FIG. 4c represents a partial view of a cross section of the heat exchanger tube obtained according to a variant of the method described in FIG. 2.
  • a heat exchanger 3 conventionally comprises a bundle of heat exchanger tubes 1 (FIG. 1) in which a first fluid circulates, via collectors 5 having orifices 2 for receiving the ends of these tubes 1.
  • the heat exchanger 3 is of substantially parallelepipedal shape, an L (longitudinal) axis is defined along the length of the heat exchanger 3, and a T (transverse) axis is defined according to the width of the heat exchanger 3.
  • Internal spacers 7 to the tubes 1 of heat exchanger may be arranged inside the heat exchanger tubes 1 so as to disturb the flow of the first fluid in the tubes 1 by increasing the exchange surface.
  • the tubes 1 of the heat exchanger can be separated from each other by external spacers 9, for example corrugated in the direction of the axis L. These external spacers 9 are traversed by a second fluid for a heat exchange with the first fluid .
  • FIG. 2 illustrating the steps of carrying out a heat exchanger tube
  • Figures 3a, 3b, 3c, 4a, 4b, and 4c illustrating some of these steps.
  • One of the objectives of the method is to obtain a tube 1 of heat exchanger (Figure 4a) of height h t , length L t and width l t , these dimensions are defined in Figure 4a.
  • the dimensions of the tube 1 shown in Figure 4a are not to scale.
  • the tube 1 has a cross section substantially in "B” with two large parallel flat faces joined together by two small curved faces.
  • the tube 1 also has an internal partition 19 forming a spacer between the two large flat faces and located substantially in the middle thereof. Said internal partition 19 forms the central bar of the "B” and divides the tube 1 into two fluid circulation channels 17a, 17b which form the two loops of the "B".
  • the internal partition 19 has a height h c .
  • the tube 1 comprises an inner spacer 7 of thickness e 3 (FIGS. 4b, 4c). Said inner spacer 7 travels the width l t of the tube 1 and extends for example over its length L t .
  • the method may comprise a preliminary step 100 in which the tube 1 is dimensioned.
  • This tube 1 is made from a metal strip 11 (FIG. 3a).
  • the band 11 is shown schematically and illustratively in Figure 3a. For ease of understanding, the figures are not to scale.
  • the strip 11 is for example of generally rectangular shape and comprises a first wall said outer wall 13 and a second so-called inner wall wall 15 parallel to the outer wall 13 and opposite thereto.
  • the terms “internal” and “external” are defined with respect to the inside and outside of the folded tube 1.
  • the outer wall 13 of the strip 11 forms the outer wall 13 of the heat exchanger tube 1 thus formed
  • the inner wall 15 of the strip 11 forms the inner wall 15 of the tube 1 of the heat exchanger thus formed (see Figure 4a).
  • the band 11 has a length 1 1; a width 1 2 and a thickness e.
  • the thickness e is for example between 0.15 mm and 0.35 mm, preferably between 0.20 mm and 0.30 mm, preferably between 0.20 and 0.27 mm.
  • the strip 11 (FIG. 3a) has opposite longitudinal edges 11a, 11b.
  • the borders 11a, 11b each have an end 12a and 12b, respectively.
  • the width 1 2 of the strip 11 is chosen so that when folded, the edges 11a, 11b are placed against each other to jointly form the internal partition 19 and the ends 12a, 12b rest on the wall internal wall 15 of the tube 1.
  • the height h c of the internal partition 19 is defined so that the ends 12a, 12b rest on the inner wall 15 of the tube 1.
  • the metal strip 11 is preferably made of aluminum or alloy of aluminum.
  • first portions 31a, 31b and a second portion 32 are delimited.
  • first portions 31a, 31b and second portions 32 are defined according to the cross section that we want to give the tube 1. In our example, we want to obtain a cross section in the form of "B".
  • the second portion 32 is located at a junction zone 22 between the ends 12a, 12b, the inner spacer 7 (not shown in this figure) and the inner wall 15 of the tube 1.
  • a junction zone 22 substantially in the center of the width 1 2 of the strip 11, and the first two portions 31a, 31b are on either side of the junction zone 22.
  • step 101 the metal strip 11 is deformed so as to create a space h e (shown in FIG. 3c) between the ends 12a, 12b and the opposite inner wall 15 of the tube 1.
  • the second portion 32 of the strip 11afin is thinned to give it a thickness e 2 .
  • Thinning is carried out for example by stamping.
  • a wheel is engaged on the band 11 in order to apply a pressure on the length i of the inner wall 15.
  • Thinning corresponds to a thickness equal to or less than the thickness e 3 of the internal spacer 7.
  • the original thickness e 3 of the inner spacer 7 is between 30 ⁇ and 200 ⁇ , preferably between 50 ⁇ and ⁇ , preferably between 50 ⁇ and 70 ⁇ .
  • the first portions 31a, 31b retain their thickness, this thickness corresponds to the thickness e of the metal strip.
  • a wheel is engaged in order to apply pressure on the inner spacer 7 and to thin it on a portion 71 at the junction zone 22 (FIG. 4b).
  • the thinned thickness e 4 of the portion 71 of the inner spacer 7 is between 0 to 75%, preferably 30% to 50% of its original thickness e.
  • a first wheel thins the band 11 and a second wheel thins the inner spacer 7.
  • the deformation is carried by the metal strip 11 and by the inner spacer 7, and the respective impact of the deformation on these two elements (strip 11 and inner spacer 7) is reduced.
  • the total thinning on the one hand of the strip 11 and on the other hand of the inner spacer 7 is equal to or less than the original thickness e of the inner spacer 7.
  • the metal strip 11 is folded to form the two circulation channels 17a, 17b (FIG. 3c) by joining the opposite edges 11a, 11b at the junction zone 22.
  • the opposite edges 11a, 11b substantially at 90 ° and to bend two portions of the strip 11 which will form the two small curved faces of the tube 1.
  • the inner spacer 7 can then be inserted into the partially folded strip 11.
  • the ends 12a, 12b are facing the inner wall 15 of the tube at the junction zone 22, but separated therefrom by a space h e .
  • the height h c of the partition has not been affected.
  • the folded band has the height h t , the width l t , and the length ⁇ .
  • the bent heat exchanger tube 1 is compressed in the direction of the height h t . Indeed, particularly in the case where only the inner spacer 7 has been thinned, it can be seen that the height h t of the heat exchanger tube 1 is increased at the junction zone 22. Indeed, the thickness of the inner spacer 7 being non-zero, its value is added to the height h t of the tube 1 heat exchanger. It is possible that this variation in height hinders the insertion of the ends of the heat exchanger tube 1 into the orifices of the collectors 5 of the heat exchanger 3. The compression of the heat exchanger tube 1 thus makes it possible to find a height h t uniform throughout the tube 1 heat exchanger.
  • the metal strip 11 of length is cut to the desired length L t of tube 1 before any insertion of the inner spacer 7 can be done.
  • the ends 12a, 12b can be secured. the inner spacer 7 and the inner wall 15 of the tube 1 by brazing together. It is also possible to braze the internal spacers 7 to the heat exchanger tube 1 at the vertices 7a of their corrugations and for example at their ends 7b (FIG. 4a).
  • Figures 4a, 4b and 4c which respectively show a sectional view of a heat exchanger tube 1 obtained by such a method.
  • the heat exchanger tube 1 formed has a substantially "B" cross section.
  • the cross-section at "B" of the tube 1 illustrated has two channels 17a and 17b of parallel fluid circulation, juxtaposed and separated by a partition 19 forming a spacer.
  • the metal strip 11 is folded so as to form the envelope of the two fluid circulation channels 17a and 17b which are parallel and juxtaposed. More specifically, the metal strip 11 is folded so that its inner wall 15 delimits the two channels 17a, 17b.
  • the partition 19 is for example made by the opposite edges 11a, 11b of the metal strip 11 bent substantially at 90 °. These opposite edges 11a, 11b folded back against each other to jointly form the partition 19 at the zone 22 junction.
  • the outer walls 13 of the opposite edges 11a, 11b are in contact.
  • the ends 12a, 12b of the borders are facing the inner wall 15 of the heat exchanger tube 1 at the junction zone 22.
  • the tube 1 of heat exchanger also comprises an inner spacer 7 of thickness e 3 arranged in the two channels 17a, 17b of fluid circulation being interposed between the ends 12a, 12b and the inner wall 15 of the tube 1 of exchanger thermal.
  • the original thickness e 3 of the inner spacer 7 is between 30 ⁇ and 200 ⁇ , preferably between 50 ⁇ and ⁇ , preferably between 50 ⁇ and 70 ⁇ .
  • FIG. 4a illustrates an embodiment of the heat exchanger tube 1 having a thinning of the internal wall 15 at the junction zone 22.
  • the heat exchanger tube 1 has two thicknesses: a first thickness e 1; and a second thickness e 2j the second thickness e 2 being less than the first thickness & i.
  • the tube 1 has the second thickness e 2 at the junction zone 22, the remainder of the tube 1 has the first thickness e.
  • the first thickness & ⁇ is between 0.15mm and 0.35mm, preferably between 0.20mm and 0.30mm, preferably between 0.20 and 0.27mm.
  • the second thickness e 2 is reduced by a value less than or equal to the thickness e 3 of the inner spacer 7 with respect to the first thickness
  • FIG. 4b illustrates a variant of the heat exchanger tube 1 comprising an inner spacer 7 thinned on a portion 71 at the zone 22 of junction.
  • the thinned thickness e 4 of the thinned portion 71 of the disruptor is between 0 to 75%, preferably from 30% to 50% of its original thickness.
  • Figure 4c illustrates a variant of the heat exchanger tube 1, the inner wall 15 and the inner spacer 7 have been thinned at the junction zone 22.
  • the respective thinning of these two elements is lower than if the thinning was carried by a single element. Thus we limit the impact of this thinning on each of the elements.
  • the total thinning provided by the two elements is less than or equal to the original thickness e of the inner spacer 7.

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

Abstract

The invention relates to a method for producing a heat exchanger tube (1) by bending a metal strip (11), said tube (1) having an internal partition (19) formed by joining the ends of opposing edges (11a, 11b). The tube also comprises an internal spacer (7) disposed between the partition (19) and the internal wall (15) of the tube facing one another at a joining zone (22). The method comprises the following steps: thinning down the metal strip (11) and/or the internal spacer (7) at the joining zone (22); and bending the metal strip (11) in order to form the tube (1), joining the ends of the opposing edges (11a, 11b) at the joining zone (22). The invention also relates to such a tube (1) and to a heat exchanger (3) comprising a bundle of said tubes (1).

Description

Tube d'échangeur thermique, échangeur thermique et procédé d'obtention correspondant  Heat exchanger tube, heat exchanger and corresponding production method
L'invention concerne un procédé d'obtention d'un tube d'échangeur thermique, notamment pour véhicules automobiles, un tube d'échangeur thermique et un échangeur thermique comprenant un faisceau de tels tubes d'échangeur thermique. The invention relates to a method for obtaining a heat exchanger tube, in particular for motor vehicles, a heat exchanger tube and a heat exchanger comprising a bundle of such heat exchanger tubes.
Généralement, les échangeurs thermiques comportent un faisceau de tubes d'échangeur thermique parallèles et deux collecteurs présentant des orifices dans lesquels sont raccordés les extrémités correspondantes des tubes d'échangeur thermique, par brasage. Les collecteurs sont munis respectivement d'une entrée et d'une sortie pour un fluide, par exemple un fluide de refroidissement, parcourant l'échangeur thermique. Le fluide pénètre donc dans les tubes d'échangeur thermique par l'intermédiaire des collecteurs.  Generally, the heat exchangers comprise a bundle of parallel heat exchanger tubes and two manifolds having orifices in which are connected the corresponding ends of the heat exchanger tubes, by brazing. The collectors are respectively provided with an inlet and an outlet for a fluid, for example a cooling fluid, passing through the heat exchanger. The fluid therefore enters the heat exchanger tubes via the collectors.
Plusieurs technologies sont utilisées pour fabriquer ces tubes, nous considérons ici les tubes d'échangeur thermique réalisés à partir de la technologie par pliage.  Several technologies are used to manufacture these tubes, here we consider the heat exchanger tubes made from the folding technology.
Généralement, de tels tubes d'échangeur thermique sont obtenus à partir d'une bobine de feuille métallique qui, par suite de son déroulement en bande, est progressivement mise en forme à la section transversale souhaitée par des outillages spécifiques de pliage. Au terme du pliage, les bordures longitudinales de la feuille sont jointes afin de créer un ou plusieurs logements dans le tube d'échangeur thermique. Le tube d'échangeur thermique peut ensuite être découpé à la longueur voulue, en tronçons correspondant aux tubes d'échangeur thermique finaux.  Generally, such heat exchanger tubes are obtained from a metal foil coil which, as a result of its unwinding, is progressively shaped to the desired cross section by specific folding tools. After folding, the longitudinal edges of the sheet are joined to create one or more housings in the heat exchanger tube. The heat exchanger tube can then be cut to the desired length, in sections corresponding to the final heat exchanger tubes.
Un paramètre à prendre en compte lors du dimensionnement des tubes d'échangeur thermique est la sollicitation mécanique en service. En effet, les tubes d'échangeur thermique sont soumis notamment à la pression du circuit dont ils font partie.  A parameter to take into account when sizing the heat exchanger tubes is the mechanical stress in service. Indeed, the heat exchanger tubes are subjected in particular to the pressure of the circuit of which they are part.
Une solution pour augmenter la résistance mécanique du tube d'échangeur thermique est de replier la bande métallique sur elle-même afin de former une entretoise qui sépare le tube en deux canaux de circulation de fluide. Un autre paramètre à prendre en compte lors du dimensionnement des tubes est l'efficacité de l'échange thermique souhaité. One solution for increasing the mechanical strength of the heat exchanger tube is to fold the metal strip back on itself to form a spacer which separates the tube into two fluid circulation channels. Another parameter to take into account when sizing tubes is the efficiency of heat exchange wish.
Pour améliorer l'efficacité de l'échange thermique, on peut par exemple agencer un intercalaire interne à l'intérieur des tubes. Cet intercalaire interne, par exemple de forme ondulée, perturbe l'écoulement du fluide dans les tubes en augmentant la surface d'échange. Cet intercalaire interne est aussi utilisé pour modifier la pression interne des tubes. Pour agencer l'intercalaire interne dans le tube d'échangeur thermique sans perdre la résistance mécanique apportée par la cloison interne, on peut par exemple, insérer deux intercalaires internes, c'est-à-dire un intercalaire interne par canal de circulation de fluide. Cependant le constructeur peut souhaiter n'utiliser qu'un seul intercalaire interne parcourant les deux canaux. Dans ce cas, une solution consiste à réduire la hauteur de la cloison interne, d'une hauteur correspondant à l'épaisseur de l'intercalaire interne.  To improve the efficiency of the heat exchange, one can for example arrange an inner interlayer inside the tubes. This inner interlayer, for example of undulating shape, disrupts the flow of fluid in the tubes by increasing the exchange surface. This inner spacer is also used to modify the internal pressure of the tubes. To arrange the inner spacer in the heat exchanger tube without losing the mechanical strength provided by the internal partition, it is possible, for example, to insert two internal spacers, that is to say an inner spacer per fluid circulation channel. . However, the constructor may wish to use only one internal interlayer traversing the two channels. In this case, one solution is to reduce the height of the internal partition, a height corresponding to the thickness of the inner spacer.
Cependant, cette solution nécessite de changer les paramètres de pliage de la bande métallique afin que la cloison interne du tube soit en contact avec l'intercalaire interne, ainsi la résistance mécanique est préservée. Or, il est difficile d'obtenir la bonne hauteur de cloison pour que la cloison interne soit en contact avec l'intercalaire interne. Si l'espace qui sépare la cloison interne de l'intercalaire est trop grand pour être facilement brasé, il est nécessaire d'augmenter la hauteur de la cloison grâce à de l'outillage spécifique. Cette opération est longue.  However, this solution requires changing the bending parameters of the metal strip so that the inner wall of the tube is in contact with the inner spacer, and the mechanical strength is preserved. However, it is difficult to obtain the correct height of the partition so that the internal partition is in contact with the inner spacer. If the space between the internal partition and the spacer is too large to be easily brazed, it is necessary to increase the height of the partition with specific tooling. This operation is long.
De plus, les intercalaires internes peuvent avoir différentes épaisseurs selon les besoins du constructeur automobile, ce qui entraîne autant de modifications possibles dans la hauteur de la cloison interne.  In addition, the internal spacers can have different thicknesses according to the needs of the car manufacturer, resulting in as many changes in the height of the internal partition.
Le procédé présenté par la suite remédie au moins partiellement à ces inconvénients en mettant en place une solution simple et peu coûteuse permettant de fabriquer des tubes d'échangeur thermique dans lesquels peuvent être logés des intercalaires internes, sans avoir à adapter la hauteur de la cloison interne à l'épaisseur des intercalaires. De plus, les tubes d'échangeurs thermiques ainsi fabriqués présentent une grande résistance mécanique. A cet effet, l'invention a pour objet un procédé d'obtention d'un tube d'échangeur thermique, ledit tube présentant deux canaux de circulation et un intercalaire interne agencé dans les deux canaux de circulation, lesdits canaux étant séparés par une cloison interne formée par jonction des bordures opposées d'une bande métallique, lesdites bordures opposées présentant respectivement une extrémité, ledit intercalaire étant interposé entre les extrémités et la paroi interne du tube en regard au niveau d'une zone de jonction, ledit procédé comprenant les étapes suivantes : The method presented here at least partially overcomes these disadvantages by implementing a simple and inexpensive solution to manufacture heat exchanger tubes in which can be housed internal dividers, without having to adjust the height of the partition internal to the thickness of the inserts. In addition, the heat exchanger tubes thus manufactured have a high mechanical strength. For this purpose, the subject of the invention is a process for obtaining a tube heat exchanger, said tube having two circulation channels and an inner interlayer arranged in the two circulation channels, said channels being separated by an internal partition formed by joining opposite edges of a metal strip, said opposite edges respectively having a end, said spacer being interposed between the ends and the inner wall of the facing tube at a junction zone, said method comprising the following steps:
• on amincit la bande métallique et/ou l'intercalaire interne au niveau de la zone de jonction, The metal strip and / or the internal interlayer are thinned at the junction zone,
• on plie la bande métallique pour former ledit tube avec deux canaux de circulation en joignant les bordures opposées au niveau de la zone de jonction. The metal strip is folded to form said tube with two circulation channels by joining the opposite edges at the junction zone.
Selon un autre aspect du procédé, on amincit par emboutissage. According to another aspect of the process, it is thinned by stamping.
Selon un autre aspect du procédé on amincit la bande métallique d'une épaisseur inférieure ou égale à l'épaisseur de l'intercalaire interne. According to another aspect of the method the metal strip is thinned with a thickness less than or equal to the thickness of the inner spacer.
Selon un autre aspect du procédé on amincit l'intercalaire interne jusqu'à 75% de son épaisseur d'origine. According to another aspect of the process, the inner interlayer is thinned up to 75% of its original thickness.
Selon un autre aspect du procédé, on peut compresser le tube après l'étape de pliage lors d'une étape supplémentaire. According to another aspect of the process, the tube can be compressed after the folding step in a further step.
Selon un autre aspect du procédé on brase ensemble les extrémités, l'intercalaire interne et la paroi interne de la bande métallique en regard. L'invention a aussi pour objet un tube d'échangeur thermique présentant deux canaux de circulation et un intercalaire interne agencé dans les deux canaux de circulation, lesdits canaux étant séparés par une cloison interne formée par jonction des bordures opposées d'une bande métallique, lesdites bordures opposées présentant respectivement une extrémité, et ledit intercalaire interne étant interposé entre les extrémités et la paroi interne du tube en regard au niveau d'une zone de jonction, la paroi interne et/ou l'intercalaire interne présentant un amincissement au niveau de la zone de jonction. According to another aspect of the method, the ends, the inner spacer and the inner wall of the metal strip facing each other are brazed together. The invention also relates to a heat exchanger tube having two circulation channels and an inner spacer arranged in the two circulation channels, said channels being separated by an internal partition formed by joining the opposite edges of a metal strip, said opposite edges respectively having an end, and said inner spacer being interposed between the ends and the inner wall of the facing tube at a junction zone, the inner wall and / or the inner interlayer having a thinning at the level of the junction area.
Selon un autre aspect du tube, l'amincissement de la bande métallique et/ou de l'intercalaire interne est inférieur ou égal à l'épaisseur de l'intercalaire interne. According to another aspect of the tube, the thinning of the metal strip and / or the inner spacer is less than or equal to the thickness of the inner spacer.
Selon un autre aspect du tube, l'épaisseur de la paroi non amincie est comprise entre 0,15mm et 0,35mm, de préférence entre 0,20mm et 0,27mm. According to another aspect of the tube, the thickness of the unthinned wall is between 0.15 mm and 0.35 mm, preferably between 0.20 mm and 0.27 mm.
Selon un autre aspect du tube, l'épaisseur non amincie de l'intercalaire interne est comprise entre 30μιη et 200μιη, de préférence entre 50μιη à 70μιη. According to another aspect of the tube, the unthinned thickness of the inner spacer is between 30μιη and 200μιη, preferably between 50μιη to 70μιη.
L'invention a aussi pour objet un échangeur thermique, notamment pour véhicule automobile, comprenant un faisceau de tubes d' échangeur thermique selon l'une quelconque des revendications précédentes. The subject of the invention is also a heat exchanger, in particular for a motor vehicle, comprising a bundle of heat exchanger tubes according to any one of the preceding claims.
L'invention a pour principal avantage qu'elle permet d'adapter la forme d'un tube d'échangeur thermique pour y insérer un intercalaire interne sans avoir à modifier la hauteur de sa cloison interne. Le procédé décrit est simple et peu coûteux et permet au tube de garder une bonne résistance mécanique. 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, et des dessins annexés parmi lesquels : The main advantage of the invention is that it makes it possible to adapt the shape of a heat exchanger tube to insert an internal spacer without having to modify the height of its internal partition. The method described is simple and inexpensive and allows the tube to maintain good mechanical strength. Other features and advantages of the invention will emerge more clearly on reading the following description, given by way of illustrative and nonlimiting example, and the appended drawings among which:
- la figure 1 représente de façon partielle et schématique un échangeur thermique, FIG. 1 partially and schematically represents a heat exchanger,
- la figure 2 représente un organigramme illustrant les étapes du procédé de fabrication du tube d'échangeur thermique, FIG. 2 represents a flowchart illustrating the steps of the method of manufacturing the heat exchanger tube,
- la figure 3a illustre de façon schématique une bande métallique servant pour la formation du tube d'échangeur thermique, la figure 3a n'étant pas représentative des dimensions de la bande pour la formation du tube d'échangeur thermique,  FIG. 3a schematically illustrates a metal strip serving for the formation of the heat exchanger tube, FIG. 3a not being representative of the dimensions of the strip for the formation of the heat exchanger tube,
- la figure 3b illustre de façon schématique la bande métallique de la figure 3a amincie,  FIG. 3b schematically illustrates the metal strip of FIG. 3a thinned,
- la figure 3c illustre de façon schématique la bande métallique de la figure 3b pliée, FIG. 3c schematically illustrates the metal strip of FIG. 3b folded,
- la figure 4a représente une vue en perspective du tube d'échangeur thermique obtenu grâce au procédé décrit par la figure 2, FIG. 4a represents a perspective view of the heat exchanger tube obtained by the process described in FIG.
- la figure 4b représente une vue partielle d'une coupe transversale du tube d'échangeur thermique obtenu selon une variante du procédé décrit par la figure 2, FIG. 4b shows a partial view of a cross-section of the heat exchanger tube obtained according to a variant of the method described in FIG. 2,
- la figure 4c représente une vue partielle d'une coupe transversale du tube d'échangeur thermique obtenu selon une variante du procédé décrit par la figure 2.FIG. 4c represents a partial view of a cross section of the heat exchanger tube obtained according to a variant of the method described in FIG. 2.
Dans ces figures, les éléments sensiblement identiques portent les mêmes références. In these figures, the substantially identical elements bear the same references.
Comme cela est partiellement illustré sur la figure 1, un échangeur thermique 3 comprend classiquement un faisceau de tubes 1 d'échangeur thermique (figure 1) dans lesquels circule un premier fluide, par l'intermédiaire de collecteurs 5 présentant des orifices 2 pour recevoir les extrémités de ces tubes 1. As partially illustrated in FIG. 1, a heat exchanger 3 conventionally comprises a bundle of heat exchanger tubes 1 (FIG. 1) in which a first fluid circulates, via collectors 5 having orifices 2 for receiving the ends of these tubes 1.
L' échangeur thermique 3 est de forme sensiblement parallélépipédique, un axe L (longitudinal) est défini selon la longueur de l'échangeur thermique 3, et un axe T (transversal) est défini selon la largeur de l'échangeur thermique 3.  The heat exchanger 3 is of substantially parallelepipedal shape, an L (longitudinal) axis is defined along the length of the heat exchanger 3, and a T (transverse) axis is defined according to the width of the heat exchanger 3.
Des intercalaires internes 7 aux tubes 1 d'échangeur thermique, par exemple de forme sensiblement ondulée dans la direction de l'axe T, peuvent être disposés à l'intérieur des tubes 1 d'échangeur thermique de façon à perturber l'écoulement du premier fluide dans les tubes 1 en augmentant la surface d'échange.  Internal spacers 7 to the tubes 1 of heat exchanger, for example of substantially corrugated shape in the direction of the axis T, may be arranged inside the heat exchanger tubes 1 so as to disturb the flow of the first fluid in the tubes 1 by increasing the exchange surface.
Les tubes 1 d'échangeur thermique peuvent être séparés les uns des autres par des intercalaires externes 9, par exemple ondulés dans la direction de l'axe L. Ces intercalaires externes 9 sont traversés par un deuxième fluide pour un échange thermique avec le premier fluide.  The tubes 1 of the heat exchanger can be separated from each other by external spacers 9, for example corrugated in the direction of the axis L. These external spacers 9 are traversed by a second fluid for a heat exchange with the first fluid .
La perturbation générée par la présence de ces intercalaires internes 7 et intercalaires externes 9, permet de faciliter les échanges thermiques entre les deux fluides.  The disturbance generated by the presence of these internal spacers 7 and external spacers 9, facilitates the heat exchange between the two fluids.
Ces intercalaires internes 7 et externes 9 sont bien connus de l'homme du métier et ne sont pas décrits plus en détail. On se réfère maintenant à la figure 2 illustrant les étapes de la réalisation d'un tube d'échangeur thermique, ainsi qu'aux figures 3a, 3b, 3c, 4a, 4b, et 4c illustrant certaines de ces étapes. These internal spacers 7 and outer 9 are well known to those skilled in the art and are not described in more detail. Referring now to FIG. 2, illustrating the steps of carrying out a heat exchanger tube, and Figures 3a, 3b, 3c, 4a, 4b, and 4c illustrating some of these steps.
Un des objectifs du procédé est d'obtenir un tube 1 d'échangeur thermique (figure 4a) de hauteur ht, de longueur Lt et de largeur lt, ces dimensions sont définies sur la figure 4a. Les dimensions du tube 1 représenté sur la figure 4a ne sont pas à l'échelle. One of the objectives of the method is to obtain a tube 1 of heat exchanger (Figure 4a) of height h t , length L t and width l t , these dimensions are defined in Figure 4a. The dimensions of the tube 1 shown in Figure 4a are not to scale.
Le tube 1 présente une section transversale sensiblement en « B » avec deux grandes faces planes parallèles, réunies entres elles par deux petites faces incurvées. Le tube 1 présente aussi une cloison interne 19 formant entretoise entre les deux grandes faces planes et située sensiblement au milieu de celles-ci. Ladite cloison interne 19 forme la barre centrale du « B » et divise le tube 1 en deux canaux 17a, 17b de circulation de fluide qui forment les deux boucles du « B ». La cloison interne 19 présente une hauteur hc. The tube 1 has a cross section substantially in "B" with two large parallel flat faces joined together by two small curved faces. The tube 1 also has an internal partition 19 forming a spacer between the two large flat faces and located substantially in the middle thereof. Said internal partition 19 forms the central bar of the "B" and divides the tube 1 into two fluid circulation channels 17a, 17b which form the two loops of the "B". The internal partition 19 has a height h c .
Le tube 1 comprend un intercalaire interne 7 d'épaisseur e3 (figures 4b, 4c). Ledit intercalaire interne 7 parcourt la largeur lt du tube 1 et s'étend par exemple sur sa longueur Lt. The tube 1 comprises an inner spacer 7 of thickness e 3 (FIGS. 4b, 4c). Said inner spacer 7 travels the width l t of the tube 1 and extends for example over its length L t .
Le procédé peut comprendre une étape 100 préliminaire lors de laquelle on dimensionne le tube 1. The method may comprise a preliminary step 100 in which the tube 1 is dimensioned.
On réalise ledit tube 1 à partir d'une bande 11 métallique (figure 3a). La bande 11 est représentée de façon schématique et illustrative sur la figure 3a. Pour faciliter la compréhension, les figures ne sont pas à l'échelle.  This tube 1 is made from a metal strip 11 (FIG. 3a). The band 11 is shown schematically and illustratively in Figure 3a. For ease of understanding, the figures are not to scale.
La bande 11 est par exemple de forme générale rectangulaire et comprend une première paroi dite paroi externe 13 et une deuxième paroi dite paroi interne 15 parallèle à la paroi externe 13 et opposée à celle-ci. Les termes « interne » et « externe » sont définis par rapport à l'intérieur et à l'extérieur du tube 1 plié. Ainsi, une fois la bande 11 pliée, la paroi externe 13 de la bande 11 forme la paroi externe 13 du tube 1 d'échangeur thermique ainsi formé, et la paroi interne 15 de la bande 11 forme la paroi interne 15 du tube 1 d'échangeur thermique ainsi formé (voir figure 4a). La bande 11 présente une longueur 11; une largeur 12 et une épaisseur e . L'épaisseur e est par exemple comprise entre 0,15mm et 0,35mm, de préférence entre 0,20mm et 0,30mm, de préférence entre 0,20 et 0,27mm. The strip 11 is for example of generally rectangular shape and comprises a first wall said outer wall 13 and a second so-called inner wall wall 15 parallel to the outer wall 13 and opposite thereto. The terms "internal" and "external" are defined with respect to the inside and outside of the folded tube 1. Thus, once the band 11 is folded, the outer wall 13 of the strip 11 forms the outer wall 13 of the heat exchanger tube 1 thus formed, and the inner wall 15 of the strip 11 forms the inner wall 15 of the tube 1 of the heat exchanger thus formed (see Figure 4a). The band 11 has a length 1 1; a width 1 2 and a thickness e. The thickness e is for example between 0.15 mm and 0.35 mm, preferably between 0.20 mm and 0.30 mm, preferably between 0.20 and 0.27 mm.
La bande 11 (figure 3a) présente des bordures lia, 11b longitudinales opposées. Les bordures lia, 11b présentent chacune une extrémité 12a et 12b, respectivement.  The strip 11 (FIG. 3a) has opposite longitudinal edges 11a, 11b. The borders 11a, 11b each have an end 12a and 12b, respectively.
La largeur 12 de la bande 11 est choisie de telle sorte qu'une fois pliée, les bordures lia, 11b sont adossées l'une contre l'autre pour former conjointement la cloison interne 19 et les extrémités 12a, 12b reposent sur la paroi interne 15 du tube 1. La hauteur hc de la cloison interne 19 est définie de telle sorte que les extrémités 12a, 12b reposent sur la paroi interne 15 du tube l.La bande 11 métallique est de préférence en aluminium ou en alliage d'aluminium. The width 1 2 of the strip 11 is chosen so that when folded, the edges 11a, 11b are placed against each other to jointly form the internal partition 19 and the ends 12a, 12b rest on the wall internal wall 15 of the tube 1. The height h c of the internal partition 19 is defined so that the ends 12a, 12b rest on the inner wall 15 of the tube 1. The metal strip 11 is preferably made of aluminum or alloy of aluminum.
Selon l'exemple illustré sur la figure 3b, on délimite des premières portions 31a, 31b et une seconde portion 32.  According to the example illustrated in FIG. 3b, first portions 31a, 31b and a second portion 32 are delimited.
Ces premières portions 31a, 31b et secondes portions 32 sont définies en fonction de la section transversale que l'on veut donner au tube 1. Dans notre exemple, on veut obtenir une section transversale en forme de « B ».  These first portions 31a, 31b and second portions 32 are defined according to the cross section that we want to give the tube 1. In our example, we want to obtain a cross section in the form of "B".
En effet, la seconde portion 32 est située au niveau d'une zone 22 de jonction entre les extrémités 12a, 12b, l'intercalaire interne 7 (non représenté sur cette figure) et la paroi interne 15 du tube 1. Selon l'exemple illustré on définit une zone 22 de jonction sensiblement au centre de la largeur 12 de la bande 11, et les deux premières portions 31a, 31b se trouvent de part et d'autre de la zone 22 de jonction. Indeed, the second portion 32 is located at a junction zone 22 between the ends 12a, 12b, the inner spacer 7 (not shown in this figure) and the inner wall 15 of the tube 1. According to the example illustrated there is defined a junction zone 22 substantially in the center of the width 1 2 of the strip 11, and the first two portions 31a, 31b are on either side of the junction zone 22.
Lors de l'étape 101 (figure 2), on déforme la bande 11 métallique de manière à créer un espace he (représenté sur la figure 3c) entre les extrémités 12a, 12b et la paroi interne 15 opposée du tube 1. In step 101 (FIG. 2), the metal strip 11 is deformed so as to create a space h e (shown in FIG. 3c) between the ends 12a, 12b and the opposite inner wall 15 of the tube 1.
Dans un premier mode de réalisation (figure 3b) de l'invention on amincit la seconde portion 32 de la bande llafin de lui donner une épaisseur e2. In a first embodiment (FIG. 3b) of the invention, the second portion 32 of the strip 11afin is thinned to give it a thickness e 2 .
Cet amincissement est réalisé par exemple, par emboutissage. Une molette est enclenchée sur la bande 11 afin d'appliquer une pression sur la longueur \i de la paroi interne 15. L'amincissement correspond à une épaisseur égale ou inférieure à l'épaisseur e3 de l'intercalaire interne 7. A titre d'exemple, l'épaisseur d'origine e3 de l'intercalaire interne 7 est comprise entre 30μιη et 200μιη, de préférence entre 50μιη et ΙΟΟμιη, de préférence entre 50μιη et 70μιη. This thinning is carried out for example by stamping. A wheel is engaged on the band 11 in order to apply a pressure on the length i of the inner wall 15. Thinning corresponds to a thickness equal to or less than the thickness e 3 of the internal spacer 7. For example, the original thickness e 3 of the inner spacer 7 is between 30μιη and 200μιη, preferably between 50μιη and ΙΟΟμιη, preferably between 50μιη and 70μιη.
Les premières portions 31a, 31b conservent leur épaisseur, cette épaisseur correspond à l'épaisseur e de la bande métallique.  The first portions 31a, 31b retain their thickness, this thickness corresponds to the thickness e of the metal strip.
Selon un autre mode de réalisation du tube 1 d'échangeur thermique, une molette est enclenchée afin d'appliquer une pression sur l'intercalaire interne 7 et pour amincir celui-ci sur une portion 71 au niveau de la zone 22 de jonction (figure 4b). L'épaisseur amincie e4 de la portion 71 de l'intercalaire interne 7 est comprise entre 0 à 75%, de préférence de 30% à 50% de son épaisseur d'origine e . According to another embodiment of the heat exchanger tube 1, a wheel is engaged in order to apply pressure on the inner spacer 7 and to thin it on a portion 71 at the junction zone 22 (FIG. 4b). The thinned thickness e 4 of the portion 71 of the inner spacer 7 is between 0 to 75%, preferably 30% to 50% of its original thickness e.
Selon un autre mode de réalisation du tube 1 d'échangeur thermique, une première molette amincit la bande 11 et une seconde molette amincit l'intercalaire interne 7. De cette façon la déformation est portée par la bande métallique 11 et par l'intercalaire interne 7, et l'impact respectif de la déformation sur ces deux éléments (bande 11 et intercalaire interne 7) est réduit. Dans ce cas, l'amincissement total d'une part de la bande 11 et d'autre part de l'intercalaire interne 7 est égal ou inférieur à l'épaisseur d'origine e de l'intercalaire interne 7. According to another embodiment of the heat exchanger tube 1, a first wheel thins the band 11 and a second wheel thins the inner spacer 7. In this way the deformation is carried by the metal strip 11 and by the inner spacer 7, and the respective impact of the deformation on these two elements (strip 11 and inner spacer 7) is reduced. In this case, the total thinning on the one hand of the strip 11 and on the other hand of the inner spacer 7 is equal to or less than the original thickness e of the inner spacer 7.
Lors d'une étape 102, on plie la bande métallique 11 pour former les deux canaux de circulation 17a, 17b (figure 3c) en joignant les bordures opposées lia, 11b au niveau de la zone 22 de jonction. On peut par exemple, plier les bordures opposées lia, 11b sensiblement à 90° et courber deux portions de la bande 11 qui formeront les deux petites faces incurvées du tube 1. In a step 102, the metal strip 11 is folded to form the two circulation channels 17a, 17b (FIG. 3c) by joining the opposite edges 11a, 11b at the junction zone 22. For example, it is possible to fold the opposite edges 11a, 11b substantially at 90 ° and to bend two portions of the strip 11 which will form the two small curved faces of the tube 1.
On peut ensuite insérer l'intercalaire interne 7 dans la bande 11 partiellement pliée.  The inner spacer 7 can then be inserted into the partially folded strip 11.
Enfin, on rabat les bordures opposées lia, 11b de façon à les adosser l'une contre l'autre. On ferme ainsi le tube 1 et on forme la cloison interne 19 du tube 1 d'échangeur thermique. L' éventuel intercalaire interne 7 peut donc être insérer en cours de pliage, avant le rabat complet de la bande 11. Finally, it folds the opposite edges 11a, 11b so as to back against each other. The tube 1 is thus closed and the internal partition 19 of the heat exchanger tube 1 is formed. The possible internal spacer 7 can thus be inserted during folding, before the complete flap of the strip 11.
De cette façon, les extrémités 12a, 12b sont en regard de la paroi interne 15 du tube au niveau de la zone 22 de jonction, mais séparée de celle-ci par un espace he. La hauteur hc de la cloison n'a pas été affectée. La bande pliée présente la hauteur ht, la largeur lt, et la longueur \ . In this way, the ends 12a, 12b are facing the inner wall 15 of the tube at the junction zone 22, but separated therefrom by a space h e . The height h c of the partition has not been affected. The folded band has the height h t , the width l t , and the length \.
Si nécessaire, on peut, lors d'une étape 103, compresser le tube 1 d'échangeur thermique plié dans le sens de la hauteur ht. En effet, particulièrement dans le cas où seul l'intercalaire interne 7 a été aminci, on peut constater que la hauteur ht du tube 1 d'échangeur thermique est augmentée au niveau de la zone 22 de jonction. En effet, l'épaisseur de l'intercalaire interne 7 étant non nulle, sa valeur s'ajoute à la hauteur ht du tube 1 d'échangeur thermique. Il est possible que cette variation de hauteur gêne l'insertion des extrémités du tube 1 d'échangeur thermique dans les orifices des collecteurs 5 de l'échangeur thermique 3. La compression du tube 1 d'échangeur thermique permet donc de retrouver une hauteur ht uniforme sur tout le tube 1 d'échangeur thermique. If necessary, it is possible, during a step 103, to compress the bent heat exchanger tube 1 in the direction of the height h t . Indeed, particularly in the case where only the inner spacer 7 has been thinned, it can be seen that the height h t of the heat exchanger tube 1 is increased at the junction zone 22. Indeed, the thickness of the inner spacer 7 being non-zero, its value is added to the height h t of the tube 1 heat exchanger. It is possible that this variation in height hinders the insertion of the ends of the heat exchanger tube 1 into the orifices of the collectors 5 of the heat exchanger 3. The compression of the heat exchanger tube 1 thus makes it possible to find a height h t uniform throughout the tube 1 heat exchanger.
Une fois le pliage achevé, on peut lors d'une étape 104, couper la bande 11 de longueur \i dans laquelle l'intercalaire interne 7 est agencé, en tubes 1 d'échangeur thermique de longueur Lt. Once the folding is completed, it is possible during a step 104 to cut the strip 11 of length in which the inner spacer 7 is arranged, in tubes 1 of heat exchanger of length L t .
Selon une variante, la bande métallique 11 de longueur est coupée à la longueur Lt de tube 1 souhaitée avant l'insertion éventuelle de l'intercalaire interne 7. Enfin, lors d'une étape 105 on peut solidariser les extrémités 12a, 12b, l'intercalaire interne 7 et la paroi interne 15 du tube 1 en les brasant ensemble. On peut aussi braser les intercalaires internes 7 au tube 1 d'échangeur thermique au niveau des sommets 7a de leurs ondulations et par exemple au niveau de leurs extrémités 7b (figure 4a). On se réfère maintenant aux figures 4a, 4b et 4c qui montrent respectivement, une vue en coupe d'un tube 1 d'échangeur thermique obtenu selon un tel procédé. According to one variant, the metal strip 11 of length is cut to the desired length L t of tube 1 before any insertion of the inner spacer 7 can be done. Finally, during a step 105 the ends 12a, 12b can be secured. the inner spacer 7 and the inner wall 15 of the tube 1 by brazing together. It is also possible to braze the internal spacers 7 to the heat exchanger tube 1 at the vertices 7a of their corrugations and for example at their ends 7b (FIG. 4a). Referring now to Figures 4a, 4b and 4c which respectively show a sectional view of a heat exchanger tube 1 obtained by such a method.
Selon l'exemple illustré sur les figures 4a, 4b et 4c le tube 1 d'échangeur thermique formé présente une section transversale sensiblement en « B ». According to the example illustrated in FIGS. 4a, 4b and 4c, the heat exchanger tube 1 formed has a substantially "B" cross section.
La section transversale en « B » du tube 1 illustré, présente deux canaux 17a et 17b de circulation de fluide parallèles, juxtaposés et séparés par une cloison 19 formant entretoise.  The cross-section at "B" of the tube 1 illustrated, has two channels 17a and 17b of parallel fluid circulation, juxtaposed and separated by a partition 19 forming a spacer.
À cet effet, la bande métallique 11 est repliée de façon à former l'enveloppe des deux canaux 17a et 17b de circulation de fluide qui sont parallèles et juxtaposés. Plus précisément, la bande métallique 11 est pliée de sorte que sa paroi interne 15 délimite les deux canaux 17a, 17b.  For this purpose, the metal strip 11 is folded so as to form the envelope of the two fluid circulation channels 17a and 17b which are parallel and juxtaposed. More specifically, the metal strip 11 is folded so that its inner wall 15 delimits the two channels 17a, 17b.
La cloison 19 est par exemple réalisée par les bordures opposées l ia, 11b de la bande métallique 11 repliées sensiblement à 90°. Ces bordures opposées l ia, 11b repliées sont adossées l'une contre l'autre pour former conjointement la cloison 19 au niveau de la zone 22 de jonction. Les parois externes 13 des bordures opposées l ia, 11b sont en contact. Les extrémités 12a, 12b des bordures sont en regard de la paroi interne 15 du tube 1 d'échangeur thermique au niveau de la zone 22 de jonction.  The partition 19 is for example made by the opposite edges 11a, 11b of the metal strip 11 bent substantially at 90 °. These opposite edges 11a, 11b folded back against each other to jointly form the partition 19 at the zone 22 junction. The outer walls 13 of the opposite edges 11a, 11b are in contact. The ends 12a, 12b of the borders are facing the inner wall 15 of the heat exchanger tube 1 at the junction zone 22.
Le tube 1 d'échangeur thermique comprend aussi un intercalaire interne 7 d'épaisseur e3 agencé dans les deux canaux 17a, 17b de circulation de fluide en étant interposé entre les extrémités 12a, 12b et la paroi interne 15 du tube 1 d'échangeur thermique. L'épaisseur d'origine e3 de l'intercalaire interne 7 est comprise entre 30μιη et 200μιη, de préférence entre 50μιη et ΙΟΟμιη, de préférence entre 50μιη et 70μιη. La figure 4a illustre un mode de réalisation du tube 1 d'échangeur thermique présentant un amincissement de la paroi interne 15 au niveau de la zone 22 de jonction. The tube 1 of heat exchanger also comprises an inner spacer 7 of thickness e 3 arranged in the two channels 17a, 17b of fluid circulation being interposed between the ends 12a, 12b and the inner wall 15 of the tube 1 of exchanger thermal. The original thickness e 3 of the inner spacer 7 is between 30μιη and 200μιη, preferably between 50μιη and ΙΟΟμιη, preferably between 50μιη and 70μιη. FIG. 4a illustrates an embodiment of the heat exchanger tube 1 having a thinning of the internal wall 15 at the junction zone 22.
Le tube 1 d'échangeur thermique présente deux épaisseurs: une épaisseur première e1 ; et une seconde épaisseur e2j la seconde épaisseur e2 étant inférieure à la première épaisseur &i. Le tube 1 présente la seconde épaisseur e2 au niveau de la zone 22 de jonction, le reste du tube 1 présente la première épaisseur e . La première épaisseur &ι est comprise entre 0,15mm et 0,35mm, de préférence entre 0,20mm et 0,30mm, de préférence entre 0,20 et 0,27mm. La seconde épaisseur e2 est réduite d'une valeur inférieure où égale à l'épaisseur e3 de l'intercalaire interne 7 par rapport à la première épaisseur The heat exchanger tube 1 has two thicknesses: a first thickness e 1; and a second thickness e 2j the second thickness e 2 being less than the first thickness & i. The tube 1 has the second thickness e 2 at the junction zone 22, the remainder of the tube 1 has the first thickness e. The first thickness & ι is between 0.15mm and 0.35mm, preferably between 0.20mm and 0.30mm, preferably between 0.20 and 0.27mm. The second thickness e 2 is reduced by a value less than or equal to the thickness e 3 of the inner spacer 7 with respect to the first thickness
La figure 4b illustre une variante du tube 1 d'échangeur thermique comprenant un intercalaire interne 7 aminci sur une portion 71 au niveau de la zone 22 de jonction. L'épaisseur amincie e4 de la portion 71 amincie du perturbateur est comprise entre 0 à 75%, de préférence de 30% à 50% de son épaisseur d'origine. FIG. 4b illustrates a variant of the heat exchanger tube 1 comprising an inner spacer 7 thinned on a portion 71 at the zone 22 of junction. The thinned thickness e 4 of the thinned portion 71 of the disruptor is between 0 to 75%, preferably from 30% to 50% of its original thickness.
La figure 4c illustre une variante du tube 1 d'échangeur thermique dont la paroi interne 15 et l'intercalaire interne 7 ont été amincis au niveau de la zone 22 de jonction. L'amincissement respectif de ces deux éléments (paroi interne 15 et intercalaire interne 7) est plus faible que si l'amincissement était porté par un seul élément. Ainsi on limite l'impact de cet amincissement sur chacun des éléments. L'amincissement total apporté par les deux éléments est inférieur ou égal à l'épaisseur d'origine e de l'intercalaire interne 7. Figure 4c illustrates a variant of the heat exchanger tube 1, the inner wall 15 and the inner spacer 7 have been thinned at the junction zone 22. The respective thinning of these two elements (inner wall 15 and inner spacer 7) is lower than if the thinning was carried by a single element. Thus we limit the impact of this thinning on each of the elements. The total thinning provided by the two elements is less than or equal to the original thickness e of the inner spacer 7.
On comprend donc qu'avec un tel procédé d'obtention de tube 1 d'échangeur thermique, il est simple d'obtenir un tube 1 possédant une bonne résistance mécanique sans avoir à changer la hauteur de la cloison interne 19. It is thus understood that with such a method of obtaining tube 1 heat exchanger, it is simple to obtain a tube 1 having good mechanical strength without having to change the height of the internal partition 19.

Claims

REVENDICATIONS
1. Procédé d'obtention d'un tube (1) d'échangeur thermique, ledit tube (1) présentant deux canaux (17a, 17b) de circulation et un intercalaire interne (7) agencé dans les deux canaux (17a, 17b) de circulation, lesdits canaux (17a, 17b) étant séparés par une cloison interne (19) formée par jonction des bordures opposées (lia, 11b) d'une bande métallique (11), lesdites bordures opposées (lia, 11b) présentant respectivement une extrémité (12a, 12b), ledit intercalaire étant interposé entre les extrémités (12a, 12b) et la paroi interne (15) du tube en regard au niveau d'une zone (22) de jonction, ledit procédé comprenant les étapes suivantes : Process for obtaining a heat exchanger tube (1), said tube (1) having two circulation channels (17a, 17b) and an inner spacer (7) arranged in the two channels (17a, 17b) the said channels (17a, 17b) being separated by an internal partition (19) formed by joining the opposite edges (11a, 11b) of a metal strip (11), the said opposite edges (11a, 11b) respectively having a end (12a, 12b), said spacer being interposed between the ends (12a, 12b) and the inner wall (15) of the facing tube at a junction zone (22), said method comprising the following steps:
• on amincit la bande métallique (11) et/ou l'intercalaire interne (7) au niveau de la zone (22) de jonction, The metal strip (11) and / or the inner spacer (7) are thinned at the junction zone (22),
• on plie la bande métallique (11) pour former ledit tube (1) avec deux canaux (17a, 17b) de circulation en joignant les bordures opposées (lia, 11b) au niveau de la zone (22) de jonction. The metal strip (11) is folded to form said tube (1) with two circulation channels (17a, 17b) by joining the opposite edges (11a, 11b) at the junction zone (22).
2. Procédé d'obtention d'un tube (1) d'échangeur thermique selon la revendication 1, caractérisé en ce que l'amincissement est réalisé par emboutissage. 2. Process for obtaining a tube (1) heat exchanger according to claim 1, characterized in that the thinning is carried out by stamping.
3. Procédé d'obtention d'un tube (1) d'échangeur thermique selon l'une des revendications précédentes, caractérisé en ce qu'on amincit la bande métallique (11) d'une épaisseur inférieure ou égale à l'épaisseur de l'intercalaire interne (7). 3. Process for obtaining a tube (1) heat exchanger according to one of the preceding claims, characterized in that thins the metal strip (11) with a thickness less than or equal to the thickness of the inner spacer (7).
4. Procédé d'obtention d'un tube (1) d'échangeur thermique selon l'une des revendications précédentes, caractérisé en ce qu'on amincit l'intercalaire interne (7) jusqu'à 75% de son épaisseur d'origine. 4. Process for obtaining a tube (1) heat exchanger according to one of the preceding claims, characterized in that thins the inner spacer (7) up to 75% of its original thickness .
5. Procédé d'obtention d'un tube (1) d'échangeur thermique selon l'une des revendications précédentes, caractérisé en ce qu'il comprend une étape supplémentaire de compression du tube (1) après l'étape de pliage. 5. Process for obtaining a tube (1) heat exchanger according to one of the preceding claims, characterized in that it comprises an additional step of compression of the tube (1) after the folding step.
6. Procédé d'obtention d'un tube (1) d'échangeur thermique selon l'une des revendications précédentes, caractérisé en ce qu'on brase ensemble les extrémités (12a, 12b), l'intercalaire interne (7) et la paroi interne (15) de la bande métallique (11) en regard. 6. Process for obtaining a heat exchanger tube (1) according to one of the preceding claims, characterized in that it brakes together the ends (12a, 12b), the inner spacer (7) and the inner wall (15) of the metal strip (11) facing.
7. Tube (1) d'échangeur thermique présentant deux canaux (17a, 17b) de circulation et un intercalaire interne (7) agencé dans les deux canaux (17a, 17b) de circulation, lesdits canaux (17a, 17b) étant séparés par une cloison interne (19) formée par jonction des bordures opposées (lia, 11b) d'une bande métallique (11), lesdites bordures opposées (lia, 11b) présentant respectivement une extrémité (12a, 12b), et ledit intercalaire interne (7) étant interposé entre les extrémités (12a, 12b) et la paroi interne (15) du tube en regard au niveau d'une zone (22) de jonction, caractérisé en ce que la paroi interne (15) et/ou l'intercalaire interne (7) présente un amincissement au niveau d'une zone (22) de jonction. 7. Heat exchanger tube (1) having two circulation channels (17a, 17b) and an inner spacer (7) arranged in the two circulation channels (17a, 17b), said channels (17a, 17b) being separated by an inner partition (19) formed by joining the opposite edges (11a, 11b) of a metal strip (11), said opposite edges (11a, 11b) respectively having an end (12a, 12b), and said inner spacer (7); ) being interposed between the ends (12a, 12b) and the inner wall (15) of the facing tube at a junction area (22), characterized in that the inner wall (15) and / or the interlayer internal (7) has a thinning at a junction area (22).
8. Tube (1) selon la revendication 7, caractérisé en ce que l'amincissement de la bande métallique (11) et/ou de l'intercalaire interne (7) est inférieur ou égal à l'épaisseur de l'intercalaire interne (7) non aminci. 8. Tube (1) according to claim 7, characterized in that the thinning of the metal strip (11) and / or the inner spacer (7) is less than or equal to the thickness of the inner spacer ( 7) not thinned.
9. Tube (1) selon la revendication 7 ou 8, caractérisé en ce que l'épaisseur (e de la paroi non amincie est comprise entre 0,15mm et 0,35mm, de préférence entre 0,20mm et 0,27mm. 9. Tube (1) according to claim 7 or 8, characterized in that the thickness (e of the unthinned wall is between 0.15mm and 0.35mm, preferably between 0.20mm and 0.27mm.
10. Tube (1) selon la revendication 7 ou 8, caractérisée en ce que l'épaisseur (e3) non amincie de l'intercalaire interne (7) est comprise entre 30μιη et 200μιη, de préférence entre 50μιη à 70μιη. 10. Tube (1) according to claim 7 or 8, characterized in that the thickness (e 3 ) unthinned of the inner spacer (7) is between 30μιη and 200μιη, preferably between 50μιη to 70μιη.
11. Échangeur thermique (3), notamment pour véhicule automobile, caractérisé en ce qu'il comprend un faisceau de tubes (1) d'échangeur thermique selon l'une quelconque des revendications précédentes. 11. Heat exchanger (3), especially for a motor vehicle, characterized in that it comprises a bundle of tubes (1) heat exchanger according to any one of the preceding claims.
PCT/EP2013/051689 2012-01-31 2013-01-29 Heat exchanger tube, heat exchanger and corresponding production method WO2013113698A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1250901A FR2986314A1 (en) 2012-01-31 2012-01-31 THERMAL EXCHANGER TUBE, HEAT EXCHANGER AND CORRESPONDING OBTAINING METHOD
FR1250901 2012-01-31

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1213555A1 (en) * 1999-09-08 2002-06-12 Zexel Valeo Climate Control Corporation Heat exchanger, tube for heat exchanger, and method of manufacturing the heat exchanger and the tube
WO2002086408A1 (en) * 2001-04-20 2002-10-31 Valeo Thermique Moteur Folded tube for a heat exchanger and method for the production thereof
FR2869678A1 (en) * 2004-04-29 2005-11-04 Valeo Systemes Thermiques Soc Tube for heat exchanger e.g. evaporator, has casing part formed from metallic strip presenting reduced thickness by forming longitudinal grooves on inner surface of casing part which delimits inner space in which partition part is disposed
FR2867845A1 (en) * 2004-03-16 2005-11-15 Valeo Climatisation HEAT EXCHANGER TUBES PROMOTING CONDENSATE DRAINAGE
DE102008013018A1 (en) * 2008-03-07 2009-09-10 Modine Manufacturing Co., Racine Flat tube for heat exchanger, has corrugated rib that is arranged in tube such that wave crest and/or wave trough cooperates with groove, where groove is arranged in tube wall and contact rib
WO2012000779A2 (en) * 2010-06-30 2012-01-05 Valeo Systemes Thermiques Heat exchanger tube, heat exchanger comprising such tubes and method for producing one such tube
FR2962203A1 (en) * 2010-06-30 2012-01-06 Valeo Systemes Thermiques Fluid circulation tube for heat exchanger of motor vehicle, has central part whose width is equal to sum of thicknesses of legs from safety distance to include dispersions of slope, where central part is perpendicular to base part

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1213555A1 (en) * 1999-09-08 2002-06-12 Zexel Valeo Climate Control Corporation Heat exchanger, tube for heat exchanger, and method of manufacturing the heat exchanger and the tube
WO2002086408A1 (en) * 2001-04-20 2002-10-31 Valeo Thermique Moteur Folded tube for a heat exchanger and method for the production thereof
FR2867845A1 (en) * 2004-03-16 2005-11-15 Valeo Climatisation HEAT EXCHANGER TUBES PROMOTING CONDENSATE DRAINAGE
FR2869678A1 (en) * 2004-04-29 2005-11-04 Valeo Systemes Thermiques Soc Tube for heat exchanger e.g. evaporator, has casing part formed from metallic strip presenting reduced thickness by forming longitudinal grooves on inner surface of casing part which delimits inner space in which partition part is disposed
DE102008013018A1 (en) * 2008-03-07 2009-09-10 Modine Manufacturing Co., Racine Flat tube for heat exchanger, has corrugated rib that is arranged in tube such that wave crest and/or wave trough cooperates with groove, where groove is arranged in tube wall and contact rib
WO2012000779A2 (en) * 2010-06-30 2012-01-05 Valeo Systemes Thermiques Heat exchanger tube, heat exchanger comprising such tubes and method for producing one such tube
FR2962203A1 (en) * 2010-06-30 2012-01-06 Valeo Systemes Thermiques Fluid circulation tube for heat exchanger of motor vehicle, has central part whose width is equal to sum of thicknesses of legs from safety distance to include dispersions of slope, where central part is perpendicular to base part

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