FR2924793A1 - Tube for brazed heat exchanger of motor vehicle, has metallic sheet folded at folding lines and comprising ends independently fixed on one of large sides of tube, where sides of one of channels have double wall thickness - Google Patents

Tube for brazed heat exchanger of motor vehicle, has metallic sheet folded at folding lines and comprising ends independently fixed on one of large sides of tube, where sides of one of channels have double wall thickness Download PDF

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Publication number
FR2924793A1
FR2924793A1 FR0708602A FR0708602A FR2924793A1 FR 2924793 A1 FR2924793 A1 FR 2924793A1 FR 0708602 A FR0708602 A FR 0708602A FR 0708602 A FR0708602 A FR 0708602A FR 2924793 A1 FR2924793 A1 FR 2924793A1
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France
Prior art keywords
tube
metal sheet
sides
channels
heat exchanger
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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
FR0708602A
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French (fr)
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FR2924793B1 (en
Inventor
Christian Riondet
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Valeo Systemes Thermiques SAS
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Valeo Systemes Thermiques SAS
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Priority to FR0708602A priority Critical patent/FR2924793B1/en
Publication of FR2924793A1 publication Critical patent/FR2924793A1/en
Application granted granted Critical
Publication of FR2924793B1 publication Critical patent/FR2924793B1/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • 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
    • 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

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

Abstract

The tube (1) has central channels (3, 4), and a metallic sheet comprising ends independently fixed on one of large sides of the tube. An anti-corrosion layer and a brazing layer are placed on internal and external surfaces of the sheet, respectively. The channel (3) has a lower side (12) and a side (13) close to the channel (4), where the sides have double wall thickness. The sheet is folded at folding lines (6-10, 6'-10').

Description

Tubes multicanaux pour un échangeur de chaleur brasé Multi-channel tubes for a brazed heat exchanger

L'invention se rapporte au domaine des échangeurs de chaleur brasés, notamment pour véhicules automobiles. The invention relates to the field of brazed heat exchangers, in particular for motor vehicles.

L'invention concerne plus spécifiquement les tubes obtenus à partir d'une feuille métallique unique, les canaux de ces tubes étant obtenus par pliages successifs de cette feuille métallique. The invention relates more specifically to the tubes obtained from a single metal sheet, the channels of these tubes being obtained by successive bends of this metal sheet.

On connaît à l'heure actuelle ce type de tubes par les documents WO 9602348, EP 0854342, EP 0866301, EP 0880002, EP 1030155, JP 10047881, WO 9902283, WO 9908060. This type of tube is currently known from WO 9602348, EP 0854342, EP 0866301, EP 0880002, EP 1030155, JP 10047881, WO 9902283 and WO 9908060.

15 Dans toutes ces réalisations, les extrémités de la feuille métallique sont fixées entre elles sur l'un des petits côtés latéral du tube par rapprochement contigu de la face interne de la feuille métallique. Or, dans ce type de tubes issus d'une feuille métallique, on ne peut mettre qu'une 20 couche de produit sur chacune des deux faces de la feuille métallique, la face interne du tube étant enduite d'une couche anti-corrosion tandis que la face externe/extérieur du tube est enduite d'une couche de brasage (pour la fixation d'ailettes ou de perturbateurs disposés entre les 25 tubes). Ainsi, dans ce type de réalisation, il est nécessaire de prévoir une couche complémentaire ou subsidiaire aux deux extrémités sur la face interne de la feuille métallique, ce qui rend le processus de fabrication particulièrement coûteux et délicat. 30 Par ailleurs, la fixation latérale des extrémités de la feuille métallique est sans doute pratique mais elle ne permet pas de renforcer mécaniquement le tube. En effet, 10 In all these embodiments, the ends of the metal sheet are fixed together on one of the small lateral sides of the tube by contiguous approximation of the internal face of the metal sheet. However, in this type of tubes from a metal sheet, only one layer of product can be placed on each of the two faces of the metal sheet, the inner face of the tube being coated with an anti-corrosion layer while the outer / outer face of the tube is coated with a brazing layer (for fixing fins or disrupters arranged between the tubes). Thus, in this type of embodiment, it is necessary to provide a complementary or subsidiary layer at both ends on the inner face of the metal sheet, which makes the manufacturing process particularly expensive and delicate. Furthermore, the lateral attachment of the ends of the metal sheet is probably practical but it does not allow to mechanically strengthen the tube. Indeed, 10

2 comme cela est le cas dans l'ensemble des documents cités précédemment, les parois du tube ne sont jamais doublées de sorte que la tenue mécanique est faible et les risques de fuite importants, en particulier lorsque l'on cherche à diminuer les épaisseurs de matière (gain en coût) alors que la pression interne (dans les tubes) est très importante. La présente invention vise à remédier aux inconvénients des tubes obtenus à partir d'une feuille métallique unique de l'art antérieur en proposant une solution pour augmenter significativement la tenue mécanique des tubes, tout en" facilitant leurs réalisations. Ainsi, l'invention consiste en un tube pour échangeur de chaleur brasé, constitué d'une feuille métallique, ledit tube présentant au moins trois canaux, caractérisé en ce que les extrémités de la feuille métallique se fixent indépendamment l'une de l'autre et sur l'un des grands côtés du tube. 2 as is the case in all of the documents mentioned above, the walls of the tube are never doubled so that the mechanical strength is low and the risk of leakage, especially when one seeks to reduce the thicknesses of matter (gain in cost) while the internal pressure (in the tubes) is very important. The present invention aims to remedy the disadvantages of the tubes obtained from a single metal sheet of the prior art by proposing a solution to significantly increase the mechanical strength of the tubes, while "facilitating their achievements. in a tube for brazed heat exchanger, consisting of a metal foil, said tube having at least three channels, characterized in that the ends of the metal foil are fixed independently of one another and on one of the long sides of the tube.

D'autres aspects avantageux de l'invention sont présentés ci-après : - au moins une des deux extrémités de la feuille métallique est enroulée sensiblement en spirale ; les deux extrémités de la feuille métallique sont enroulées sensiblement en spirale ; - tous les canaux du tube sont formés chacun par au moins trois angles de pliage/courbure de la feuille métallique ; - au moins une partie de la face extérieure de la feuille métallique constituant ledit tube comporte une couche de brasage et seule la face extérieure de la feuille métallique constituant ledit tube comporte une couche de brasage ; - selon un aspect particulièrement avantageux de l'invention, le tube présente un axe de symétrie et/ou un centre de symétrie ; au moins un des canaux est formé par quatre angles de 5 pliage/courbure de la feuille métallique ; - au moins une partie des faces intérieures du tube, ou de la face intérieure de la feuille métallique constituant ledit tube, comporte une couche anti-corrosion. Other advantageous aspects of the invention are presented below: at least one of the two ends of the metal sheet is wound substantially in a spiral; both ends of the metal sheet are wound substantially spirally; all the channels of the tube are each formed by at least three angles of folding / curvature of the metal sheet; - At least a portion of the outer face of the metal sheet constituting said tube comprises a solder layer and only the outer face of the metal sheet constituting said tube comprises a solder layer; according to a particularly advantageous aspect of the invention, the tube has an axis of symmetry and / or a center of symmetry; at least one of the channels is formed by four bending / bending angles of the metal foil; - At least a portion of the inner faces of the tube, or the inner face of the metal sheet constituting said tube, comprises an anti-corrosion layer.

10 L'invention concerne un échangeur de chaleur caractérisé en ce qu'il comprend une pluralité de tubes tels que définis ci-dessus. The invention relates to a heat exchanger characterized in that it comprises a plurality of tubes as defined above.

Dans la description qui suit, faite seulement à titre 15 d'exemple, on se réfère aux dessins annexés, sur lesquels : In the following description, which is given by way of example only, reference is made to the accompanying drawings, in which:

- la figure 1 est une vue en coupe d'un tube à quatre canaux plié à partir d'une feuille métallique unique selon l'invention ; - la figure 2 est une vue en coupe d'un second mode d'exécution d'un tube à quatre canaux plié à partir d'une feuille métallique unique. - Figure 1 is a sectional view of a four-channel tube bent from a single metal sheet according to the invention; FIG. 2 is a sectional view of a second embodiment of a four-channel tube bent from a single metal sheet.

25 La figure 1 présente un tube 1 à quatre canaux 2, 3, 4, 5 dans lequel chaque canal 2, 3, 4, 5 présente une section d'ouverture sensiblement identique. Bien entendu, on pourra envisager de réaliser ces quatre canaux 2, 3, 4, 5 avec des sections d'ouverture ou des aires d'ouverture de passage 30 différentes. FIG. 1 shows a four-channel tube 1, 2, 3, 4, 5 in which each channel 2, 3, 4, 5 has a substantially identical opening section. Of course, it will be possible to envisage making these four channels 2, 3, 4, 5 with opening sections or different passage opening areas.

La feuille métallique, non visible dans son état initial sur les figures annexées, destinée à l'obtention d'un tube 20 1 selon l'invention, présente une forme rectangulaire ou carré et est généralement en aluminium ou en alliage d'aluminium. The metal sheet, not visible in its initial state in the accompanying figures, intended to obtain a tube 20 1 according to the invention, has a rectangular or square shape and is generally made of aluminum or aluminum alloy.

Dans l'exemple choisi pour représenter l'invention et représenté sur la figure 1, la feuille métallique est pliée au niveau de dix lignes de pliage différentes 6, 6', 7, 7', 8, 8', 9, 9', 10, 10', deux lignes de pliage 6, 7 et 6', 7' étant présentes respectivement aux deux extrémités latérales du tube 1 tandis que six lignes de pliage 8, 8', 9, 9', 10, 10' sont présentes pour former respectivement chacun des deux canaux 3, 4 situés au milieu du tube. In the example chosen to represent the invention and shown in FIG. 1, the metal sheet is folded at ten different fold lines 6, 6 ', 7, 7', 8, 8 ', 9, 9'. 10, 10 ', two fold lines 6, 7 and 6', 7 'being respectively present at both lateral ends of the tube 1 while six folding lines 8, 8', 9, 9 ', 10, 10' are present to respectively form each of the two channels 3, 4 in the middle of the tube.

Dans le tube 1 représenté sur la figure 2, les lignes de pliage du premier mode d'exécution se retrouvent à l'identique, au même emplacement, et on trouve simplement en plus deux lignes de pliage complémentaires 11, 11' aux deux extrémités de la feuille métallique. In the tube 1 shown in FIG. 2, the fold lines of the first embodiment are found identically, at the same location, and there are simply two additional fold lines 11, 11 'at both ends of the fold. the metal sheet.

Ainsi, on constate que le pliage de la feuille métallique pour obtenir le tube 1 de l'invention s'opère en spirale ou en escargot, c'est-à-dire que la feuille métallique est enroulée sur elle-même. Thus, it is found that the folding of the metal sheet to obtain the tube 1 of the invention operates in a spiral or snail, that is to say that the metal sheet is wound on itself.

Si on devait choisir de réaliser un tube 1 selon l'invention avec plus de quatre canaux 2, 3, 4, 5, par exemple à cinq, six ou sept canaux, la feuille métallique serait toujours pliée suivant des lignes de pliage pour s'enrouler sur elle-même. Grâce à ce type de pliage en enroulement, on double, voire on triple, les épaisseurs de paroi, en particulier au milieu ou au centre du tube 1, là où les sollicitations mécaniques sont les plus importantes. If one had to choose to make a tube 1 according to the invention with more than four channels 2, 3, 4, 5, for example five, six or seven channels, the metal sheet would always be folded along fold lines for s' roll on itself. Thanks to this type of winding folding, the wall thicknesses are doubled or even triple, in particular in the middle or in the center of the tube 1, where the mechanical stresses are the most important.

Ainsi, comme on peut le voir sur les réalisations présentées sur les figures annexées, les deux canaux centraux 3, 4 présentent chacun deux côtés ayant une double épaisseur de paroi, à savoir le côté inférieur 12, 12' et le côté 13, 13' proche de l'autre canal central 4 ou 3. Cette réalisation avec plusieurs épaisseurs de paroi permet d'améliorer très significativement la tenue mécanique du tube 1, ce qui permet en particulier de diminuer l'épaisseur de la feuille métallique, et donc des parois du tube. Dans les réalisations de l'invention présentées sur les deux figures annexées, seule la face externe ou extérieure de la feuille métallique présente une ou plusieurs couche(s) de brasage, ce qui correspond au mode de réalisation classique. Thus, as can be seen from the embodiments presented in the appended figures, the two central channels 3, 4 each have two sides having a double wall thickness, namely the lower side 12, 12 'and the side 13, 13' close to the other central channel 4 or 3. This embodiment with several wall thicknesses can significantly improve the mechanical strength of the tube 1, which allows in particular to reduce the thickness of the metal sheet, and therefore the walls of the tube. In the embodiments of the invention presented in the two appended figures, only the outer or outer face of the metal sheet has one or more brazing layer (s), which corresponds to the conventional embodiment.

Pour accroître la tenue mécanique du tube 1, le second mode de réalisation présente, pour les canaux centraux 3 et 4, un retour 14, 14' des extrémités de la feuille métallique le long du grand côté supérieur 15, 15' afin de réaliser une liaison plus longue entre les parois des canaux centraux 3, 4 et les parois du grand côté supérieur 15, 15'. Bien entendu, on pourra prévoir de prolonger ces retours 14, 14' sur toute la longueur des grands côtés des canaux centraux 15, 15'. To increase the mechanical strength of the tube 1, the second embodiment has, for the central channels 3 and 4, a return 14, 14 'of the ends of the metal sheet along the long upper side 15, 15' to achieve a longer connection between the walls of the central channels 3, 4 and the walls of the large upper side 15, 15 '. Of course, it will be possible to extend these returns 14, 14 'over the entire length of the long sides of the central channels 15, 15'.

Le tube 1 de l'invention comportera avantageusement (pour sa résistance à la pression interne) un axe de symétrie 30 XX', voire même un centre de symétrie X " . The tube 1 of the invention will advantageously comprise (for its resistance to internal pressure) an axis of symmetry XX ', or even a center of symmetry X ".

Claims (9)

Revendicationsclaims 1. Tube (1) pour échangeur de chaleur brasé, constitué d'une feuille métallique, ledit tube (1) présentant au 5 moins trois canaux (2, 3, 4), caractérisé en ce que les extrémités de la feuille métallique se fixent indépendamment l'une de l'autre et sur l'un des grands côtés (15, 15') du tube (1). 10 1. Tube (1) for brazed heat exchanger, consisting of a metal sheet, said tube (1) having at least three channels (2, 3, 4), characterized in that the ends of the metal sheet are fixed independently of one another and on one of the long sides (15, 15 ') of the tube (1). 10 2. Tube (1) selon la revendication 1, caractérisé en ce qu'au moins une des deux extrémités de la feuille métallique est enroulée sensiblement en spirale. 2. Tube (1) according to claim 1, characterized in that at least one of the two ends of the metal sheet is wound substantially spirally. 3. Tube (1) selon la revendication 2, caractérisé en ce que 15 les deux extrémités de la feuille métallique sont enroulées sensiblement en spirale. 3. Tube (1) according to claim 2, characterized in that both ends of the metal foil are wound substantially spirally. 4. Tube (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que tous les canaux (2, 3, 20 4, 4. Tube (1) according to any one of the preceding claims, characterized in that all the channels (2, 3, 20 4, 5) du tube (1) sont formés chacun par au moins trois angles de pliage/courbure (6, 7, 10 et 6', 7', 10'et 8, 9, 10 et 8', 9', 10') de la feuille métallique. 5. Tube (1) selon l'une quelconque des revendications 25 précédentes, caractérisé en ce qu'au moins une partie de la face extérieure de la feuille métallique constituant ledit tube (1) comporte une couche de brasage et en ce que seule la face extérieure de la feuille métallique constituant ledit tube (1) comporte une couche de brasage. 30 5) of the tube (1) are each formed by at least three folding / bending angles (6, 7, 10 and 6 ', 7', 10 'and 8, 9, 10 and 8', 9 ', 10') of the metal sheet. 5. Tube (1) according to any one of the preceding claims, characterized in that at least a portion of the outer face of the metal sheet constituting said tube (1) comprises a solder layer and in that only the outer face of the metal sheet constituting said tube (1) comprises a solder layer. 30 6. Tube (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il présente un axe de symétrie XX' et/ou un centre de symétrie X". 6 6. Tube (1) according to any one of the preceding claims, characterized in that it has an axis of symmetry XX 'and / or a center of symmetry X ". 7. Tube (1) selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'au moins un des canaux (2 ou 5) est formé par quatre angles de pliage/courbure (6, 7, 10 ou 6', 7', 10') de la feuille métallique. 7. Tube (1) according to any one of claims 1 to 3, characterized in that at least one of the channels (2 or 5) is formed by four angles of bending / curvature (6, 7, 10 or 6 '). , 7 ', 10') of the metal sheet. 8. Tube (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins une partie des faces intérieures du tube (1), ou de la face intérieure de la feuille métallique constituant ledit tube (1), comportent comporte une couche anti-corrosion. 8. Tube (1) according to any one of the preceding claims, characterized in that at least a portion of the inner faces of the tube (1), or the inner face of the metal sheet constituting said tube (1), comprise has an anti-corrosion layer. 9. Echangeur de chaleur, caractérisé en ce qu'il comprend une pluralité de tubes (1) selon l'une quelconque des revendications précédentes. 9. Heat exchanger, characterized in that it comprises a plurality of tubes (1) according to any one of the preceding claims.
FR0708602A 2007-12-11 2007-12-11 MULTI-CHANNEL TUBES FOR A HEAT EXCHANGER BRASE Expired - Fee Related FR2924793B1 (en)

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FR0708602A FR2924793B1 (en) 2007-12-11 2007-12-11 MULTI-CHANNEL TUBES FOR A HEAT EXCHANGER BRASE

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FR0708602A FR2924793B1 (en) 2007-12-11 2007-12-11 MULTI-CHANNEL TUBES FOR A HEAT EXCHANGER BRASE

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FR2924793B1 FR2924793B1 (en) 2015-12-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2486788A (en) * 2010-12-22 2012-06-27 Denso Marston Ltd A heat exchanger, a tube for a heat exchanger, a method of making a tube for a heat exchanger and a method of making a heat exchanger
CN104792210A (en) * 2014-01-16 2015-07-22 泰安鼎鑫冷却器有限公司 Three-part combined radiating tube

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1172623A2 (en) * 2000-07-11 2002-01-16 Delphi Technologies, Inc. Heat exchanger and fluid pipe therefor
EP1630512A1 (en) * 2003-05-08 2006-03-01 T.RAD Co,.Ltd Flat tube for aluminium heat exchanger
EP1712862A2 (en) * 2005-04-13 2006-10-18 Delphi Technologies, Inc. Fabricated, brazed metal heat exchanger tube manufacture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1172623A2 (en) * 2000-07-11 2002-01-16 Delphi Technologies, Inc. Heat exchanger and fluid pipe therefor
EP1630512A1 (en) * 2003-05-08 2006-03-01 T.RAD Co,.Ltd Flat tube for aluminium heat exchanger
EP1712862A2 (en) * 2005-04-13 2006-10-18 Delphi Technologies, Inc. Fabricated, brazed metal heat exchanger tube manufacture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2486788A (en) * 2010-12-22 2012-06-27 Denso Marston Ltd A heat exchanger, a tube for a heat exchanger, a method of making a tube for a heat exchanger and a method of making a heat exchanger
GB2486671A (en) * 2010-12-22 2012-06-27 Denso Marston Ltd A Heat Exchanger, a Tube for a Heat Exchanger, a Method of making a tube for a Heat Exchanger and a Method of Making a Heat Exchanger
GB2486788B (en) * 2010-12-22 2016-12-07 Denso Marston Ltd A heat exchanger,a tube for a heat exchanger,a method of making a tube for a heat exchanger and a method of making a heat exchanger
CN104792210A (en) * 2014-01-16 2015-07-22 泰安鼎鑫冷却器有限公司 Three-part combined radiating tube

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