WO2018154227A1 - Brazed heat exchanger and associated manufacturing method - Google Patents

Brazed heat exchanger and associated manufacturing method Download PDF

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Publication number
WO2018154227A1
WO2018154227A1 PCT/FR2018/050398 FR2018050398W WO2018154227A1 WO 2018154227 A1 WO2018154227 A1 WO 2018154227A1 FR 2018050398 W FR2018050398 W FR 2018050398W WO 2018154227 A1 WO2018154227 A1 WO 2018154227A1
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WO
WIPO (PCT)
Prior art keywords
tubes
heat exchanger
stampings
stamping
long sides
Prior art date
Application number
PCT/FR2018/050398
Other languages
French (fr)
Inventor
Jean-Yves BESNARD
Original Assignee
Valeo Systemes Thermiques
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Publication date
Application filed by Valeo Systemes Thermiques filed Critical Valeo Systemes Thermiques
Publication of WO2018154227A1 publication Critical patent/WO2018154227A1/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
    • F28D1/04—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 tubular conduits
    • F28D1/053—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 tubular conduits the conduits being straight
    • F28D1/0535—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 tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • 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
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/26—Safety or protection arrangements; Arrangements for preventing malfunction for allowing differential expansion between elements

Definitions

  • the invention relates to a brazed heat exchanger, in particular for a motor vehicle, and its method of manufacture.
  • the tubes are generally tubes of oval or oblong section, defined by a major axis and a minor axis, and having ends inserted into holes of a header plate.
  • a brazed heat exchanger when the connection between the tubes and the collector plate is made by soldering. This connection is rigid and can not compensate for the expansion and shrinkage phenomena related to temperature variations during the use of the heat exchanger. Over time, due to these thermal expansions and retractions, the metal in which the tubes and the collector plate are formed can become fatigued and this can lead to the formation of cracks in the connection between the tubes and the collector plate and thus potentially lead to leaks or breaks.
  • a known solution is to have one or more flat reinforcing plates between the collector plate and the spacers. These flat reinforcing plates are generally brazed with the collector plate and the tubes in order to increase the resistance of the assembly to the efforts related to thermal expansion and retraction.
  • the addition of such flat reinforcing plates adds elements and mass to the heat exchanger and increases the production costs.
  • An object of the present invention is therefore to at least partially overcome the disadvantages of the prior art and to provide an improved heat exchanger and its manufacturing process.
  • the present invention therefore relates to a brazed heat exchanger comprising:
  • a tube bundle having a plurality of tubes arranged parallel to each other, said tube bundle having spacers arranged between the tubes, the tubes having two long sides and two short sides connecting the edges of said long sides,
  • each header comprising a header plate, said header plate comprising openings within which the pipe ends are introduced,
  • the surface of the long sides of the tubes having stampings extending from the edges of the long sides and extending towards the center of said long sides, said stampings being made at the ends of the tubes, between the ends of the spacers and the collector plate.
  • stampings makes it possible to increase the flexibility of the ends of the tubes and thus enables the latter to better withstand temperature variations and therefore the phenomena of expansion and retraction.
  • the tubes as well as the connection with the collector plate can thus have a better wear resistance and the heat exchanger can therefore have an extended life cycle.
  • the ends of the tubes comprise at least one set of stampings comprising:
  • the ends of the tubes comprise two sets of parallel stampings.
  • the stampings have a depth greater than 5% of the thickness of the tubes and less than 25% of the thickness of the tubes.
  • the upper edge of the stampings is at a distance from the header plate greater than 0 mm and less than half the distance between the header plate and the spacers.
  • the stampings have a height greater than the thickness of the wall of said tubes and less than 90% of the distance between the header plate and the spacers.
  • the stampings have a length greater than 20% of the width of the tubes and less than 50% of the width of the tubes.
  • the stampings have a flat bottom and parallel to the long sides of the tubes.
  • the tubes comprise a reinforcing leg disposed within said tubes and connecting their long sides and in that said reinforcing leg is folded against the inside of a large side at the ends of said tubes.
  • the reinforcing leg is bent from the end of the tubes to a depth greater than 0 mm and less than half the distance between the collector plate and the spacers.
  • the present invention also relates to a method of manufacturing a heat exchanger as described above and comprising a step of stamping the ends of the tubes made immediately after the step of brazing the tubes and the collector plates.
  • the tubes comprise a reinforcing leg disposed within said tubes and said method comprises a step of folding said reinforcing leg.
  • FIG. 1 shows a schematic representation of a heat exchanger
  • FIG. 2 shows a diagrammatic representation in section along the sectional plane AA of a collector of a heat exchanger of FIG. 1 according to a first embodiment
  • FIG. 3 shows a schematic representation in perspective of a tube end
  • FIG. 4 shows a schematic representation of a collector of the heat exchanger of FIGS. 1 and 2,
  • FIG. 5 shows a schematic representation in plan view of a tube end
  • FIG. 6 shows a schematic representation in perspective of a collector of a heat exchanger according to a second embodiment
  • FIG. 7 shows a schematic representation in perspective of the inside of a tube
  • FIGS. 8a to 8c show a schematic representation of the steps of the method of folding a retaining leg.
  • FIG. 1 shows a heat exchanger 1, generally of parallelepipedal shape, comprising a beam formed of a multitude of tubes 2 within which a first heat transfer fluid can circulate.
  • the tubes 2 are of oblong section, defined by a major axis and a minor axis and are arranged parallel to each other.
  • the tubes 2 are flat tubes, that is to say they have two large sides 21a, 21b (visible in Figure 3) of flat surface and parallel to the major axis and two small sides 22a, 22b (visible in Figure 2) of curved surface forming the edge of the tubes 2 and connecting the edges of the long sides 21a , 21b.
  • interleaves 6 are arranged against the long sides 21a, 21b which act as a disrupter and increase the heat exchange surface with a second heat transfer fluid passing between the tubes 2 through the spacers 6.
  • the tubes 2 and the spacers 6 are made of metal.
  • the tubes 2 and the spacers 6 forming the bundle are fixed together by brazing.
  • the spacers 6 are for example corrugated or crenellated strips, placed between the tubes 2 and fixed to said tubes 2 by soldering. This is called a brazed beam.
  • the heat exchanger 1 also comprises two manifolds 3 or water boxes, a manifold 3 being disposed at each end of the tubes 2. These manifolds 3 each comprise a header plate 4 and a cover 8 coming to cover the header plate 4 and close the 3. These collectors 3 allow the collection and / or distribution of the first heat transfer fluid so that it circulates in the tubes 2.
  • the header plate 4 is sealingly connected between the collector 3 and the bundle of tubes 2.
  • the header plate 4 may be of generally rectangular shape.
  • the collector plate 4 also comprises a multitude of orifices having a shape corresponding to the shape of the section of the tubes 2 and able to receive the ends of the tubes 2.
  • the tubes 2 are fixed to the collector plate 4 in a sealed manner by brazing.
  • the tubes 2, the spacers 6 and the collector plates 4 being brazed, the latter are made of a metal material including aluminum or aluminum alloy. This is called a heat exchanger 1 brazed.
  • the header plate 4 has on its entire periphery a flange 41 upward towards the lid 8 so as to form a groove 42 in which is inserted the cover 8.
  • a seal (not shown) is inserted into the groove 44 to seal between the cover 8 and the header plate 4.
  • the cover 8 is held against the collector plate 4 by crimping tabs 43 disposed on the flange 41 and folded over a shoulder 80 of the cover 8.
  • the surface of the long sides 21a, 21b of the tubes 2 comprises stampings 25 extending from the edges of the long sides 21a, 21b and extending towards the center of said long sides 21a, 21b.
  • edges of the long sides 21a, 21b is meant here the edges making the connection with the short sides 22a, 22b.
  • These stampings 25 are made at the ends of the tubes 2, between the ends of the spacers 6 and the collector plate 4.
  • These stampings 25 are local thinning of the thickness E of the tubes (visible in particular in Figure 5) between the two long sides 21a and 21b.
  • stampings 25 increases the flexibility of the ends of the tubes 2 and thus allows the latter to better withstand temperature variations and therefore the phenomena of expansion and retraction.
  • the tubes 2 and the connection with the collector plate 4 can thus have a better wear resistance and the heat exchanger 1 can therefore have an extended life cycle.
  • the stampings 25 may have a flat bottom and parallel to the long sides 21a, 21b of the tubes 2.
  • the stampings 25 may in particular have a rectangular profile, as shown in Figures 2 and 3. More specifically, the ends of the tubes 2 may comprise at least 25.
  • An embossing assembly 25 comprises four stampings 25 arranged in the following manner: 0 a first stamping 25 carried out at a first edge of a first major side 21a,
  • said third stamping 25 being aligned with the first stamping 25, and
  • Figure 4 shows more precisely how the stampings are positioned in the space between the header plate 4 and the end of the spacers 6 (not shown in Figure 4).
  • the upper edge of the stampings 25 is preferably at a distance D 1 from the collecting plate 4 greater than 0 mm and less than half the distance D 2 between the collecting plate 4 and the spacers 6, so that the The stamping 25 remains as close as possible to the manifold plate 4 to allow an increase in the flexibility of the tubes 2 at this level and to absorb the phenomena of expansion and retraction.
  • the upper edge of the stampings 25 is meant the edge of the stampings 25 closest to the header plate 4.
  • the stampings 25 have a height H greater than the thickness of the wall of said tubes 2 so that the stampings 25 provide sufficient flexibility. This height H can go up to 90% of the distance D2 between the collector plate (4) and the spacers 6.
  • the stampings 25 may have a length L1 greater than 20% of the width L2 of the tubes 2 and less than 50% of the width L2 of the tubes 2. Such a length L1 allows a compromise between the increase of the flexibility and the increase loss of charges. Indeed, the more stampings 25 have a length Ll high, plus the pressure losses will be high because the ends of the tubes 2 have a significant throttling.
  • such a length L1 is particularly useful when the tubes 2 comprise a reinforcing leg 27 (visible in Figures 2 to 5) in their center.
  • This reinforcing leg 27 interconnects the long sides 21a, 21b of the tubes 2.
  • the stampings 25 thus do not overlap this reinforcing leg 27.
  • Such a reinforcing leg 27 may in particular be present in tubes 2 formed by a folded plate on itself and brazed so as to form the tube 2.
  • the stampings 25 may also have a depth P 1 greater than 5% of the thickness E of the tubes 2 and less than 25% of the thickness E of the tubes 2, as illustrated. in FIG. 5. This PI depth allows a compromise between the increase of the flexibility and the increase of the losses of loads.
  • the ends of the tubes 2 may comprise a single stamping assembly 25. Such an embodiment may allow an extension of the life cycle of the heat exchanger 1 of the order of 43 %.
  • the ends of the tubes 2 may comprise two sets of parallel stampings. Such an embodiment may allow an extension of the life cycle of the heat exchanger 1 of the order of 84%.
  • the tubes 2 comprise a reinforcing leg 27 disposed within them
  • said reinforcing leg 27 can be folded against the inside of a large side 21a, 21b at the ends of said tubes 2 as illustrated in FIGS. 4 and 7 to 8c.
  • this reinforcing leg 27 provides rigidity to the tube 2 and therefore the fact that the reinforcing leg 27 is folded at the ends of the tubes 2 gives greater flexibility to the ends of the tubes 2 to absorb the phenomena of dilation and retraction.
  • the reinforcing leg 27 can in particular be folded against the inside of a large side 21a, 21b from the end of the tubes 2 to a depth P2 (visible in FIG.
  • the depth P2 is such that the folding of the reinforcing leg 27 goes beyond the header plate 4 in order to be able to encompass the brazed connection zone between the tubes 2 and the header plate 4.
  • the present invention also relates to a method of manufacturing a brazed heat exchanger 1 as described above.
  • the tubes 2 are fixed in the orifices of the header plate 4 during a soldering step.
  • the manufacturing method according to the invention comprises a step of stamping the ends of the tubes 2 in the space between the collector plate 4 and the end of the spacers 6.
  • This stamping step is preferably carried out immediately after the brazing step of the tubes 2 and the collector plates 4 in order to take advantage of the fact that the tubes 2 are still malleable and that the impact of such stamping can be absorbed without altering the connection between the tubes 2 and the collector plate 4.
  • the manufacturing method may also include a step of folding said reinforcing leg 27.
  • FIG. 8a shows a tube end 2 after its formation and exhibiting a retaining leg 27 connecting its long sides 21a, 21b.
  • FIG. 8b shows the folding step which can in particular be carried out by means of a beveled tool k inserted into the tube 2 as illustrated in FIGS. 8a to 8c.
  • Figure 8c shows the end of the tube 2 once the retaining leg 27 folded.

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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)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)

Abstract

The present invention relates to a brazed heat exchanger (1) comprising: a bundle of tubes (2) comprising a multitude of tubes (2) arranged parallel to one another, said bundle of tubes (2) comprising inserts (6) placed between the tubes (2), the tubes (2) comprising two long sides (21a, 21b) and two short sides (22a, 22b) connecting the edges of said long sides (21a, 21b), two headers (3), one header (3) being arranged on each side of the bundle of tubes (2), each header (3) comprising a header plate (4), said header plate (4) comprising orifices inside which the ends of the tubes (2) are fitted, the surface of the long sides (21a, 21b) of the tubes (2) comprising stampings (25) extending from the edges of the long sides (21a, 21b) and extending towards the centre of said long sides (21a, 21b), said stampings (25) being produced at the ends of the tubes (2) between the ends of the inserts (6) and the header plate (4).

Description

Échangeur de chaleur brasé et procédé de fabrication associé.  Brazed heat exchanger and method of manufacturing the same
L'invention concerne un échangeur de chaleur brasé, en particulier pour véhicule automobile, et son procédé de fabrication. The invention relates to a brazed heat exchanger, in particular for a motor vehicle, and its method of manufacture.
Elle concerne plus particulièrement un échangeur de chaleur du type comprenant une multitude de tubes entre lesquels sont insérées des intercalaires. Les tubes sont généralement des tubes de section ovale ou oblongue, définie par un grand axe et un petit axe, et ayant des extrémités introduites dans des orifices d'une plaque collectrice. On parle d'un échangeur de chaleur brasé lorsque la liaison entre les tubes et la plaque collectrice est réalisée par brasage. Cette liaison est donc rigide et ne peut pas compenser les phénomènes de dilatation et de rétractation liés aux variations de température lors de l'utilisation de l'échangeur de chaleur. Au fil du temps du fait de ces dilatations et rétractations thermiques, le métal dans lequel sont formés les tubes et la plaque collectrice peut se fatiguer et cela peut entraîner la formation de fissures au niveau de la liaison entre les tubes et la plaque collectrice et ainsi potentiellement engendrer des fuites ou des ruptures. It relates more particularly to a heat exchanger of the type comprising a multitude of tubes between which are inserted tabs. The tubes are generally tubes of oval or oblong section, defined by a major axis and a minor axis, and having ends inserted into holes of a header plate. We speak of a brazed heat exchanger when the connection between the tubes and the collector plate is made by soldering. This connection is rigid and can not compensate for the expansion and shrinkage phenomena related to temperature variations during the use of the heat exchanger. Over time, due to these thermal expansions and retractions, the metal in which the tubes and the collector plate are formed can become fatigued and this can lead to the formation of cracks in the connection between the tubes and the collector plate and thus potentially lead to leaks or breaks.
Une solution connue est de disposer une ou plusieurs plaques de renfort planes entre la plaque collectrice et les intercalaires. Ces plaques de renfort planes sont généralement brasées avec la plaque collectrice et les tubes afin d'augmenter la résistance de l'ensemble aux efforts liés à la dilatation et la rétractation thermique. Cependant, l'ajout de telles plaques de renfort planes rajoute des éléments et de la masse à l'échangeur de chaleur et augmente de fait les coûts de production.  A known solution is to have one or more flat reinforcing plates between the collector plate and the spacers. These flat reinforcing plates are generally brazed with the collector plate and the tubes in order to increase the resistance of the assembly to the efforts related to thermal expansion and retraction. However, the addition of such flat reinforcing plates adds elements and mass to the heat exchanger and increases the production costs.
Un des buts de la présente invention est donc de remédier au moins partiellement aux inconvénients de l'art antérieur et de proposer un échangeur de chaleur amélioré ainsi que son procédé de fabrication. La présente invention concerne donc un échangeur de chaleur brasé comprenant : An object of the present invention is therefore to at least partially overcome the disadvantages of the prior art and to provide an improved heat exchanger and its manufacturing process. The present invention therefore relates to a brazed heat exchanger comprising:
0 un faisceau de tubes comportant une multitude de tubes disposés parallèlement les uns aux autres, ledit faisceau de tubes comportant des intercalaires disposés entre les tubes, les tubes comportant deux grands côtés et deux petits côtés reliant les bords desdits grands côtés, 0 a tube bundle having a plurality of tubes arranged parallel to each other, said tube bundle having spacers arranged between the tubes, the tubes having two long sides and two short sides connecting the edges of said long sides,
0 deux collecteurs, un collecteur étant disposé de chaque côté du faisceau de tubes, chaque collecteur comportant une plaque collectrice, ladite plaque collectrice comprenant des orifices à l'intérieur desquels sont introduits les extrémités des tubes, 0 two collectors, a collector being arranged on each side of the tube bundle, each header comprising a header plate, said header plate comprising openings within which the pipe ends are introduced,
la surface des grands côtés des tubes comportant des estampages s 'étendant depuis les bords des grands côtés et se prolongeant en direction du centre desdits grands côtés, lesdits estampages étant réalisés aux extrémités des tubes, entre les extrémités des intercalaires et la plaque collectrice.  the surface of the long sides of the tubes having stampings extending from the edges of the long sides and extending towards the center of said long sides, said stampings being made at the ends of the tubes, between the ends of the spacers and the collector plate.
La présence de ces estampages permet d'augmenter la flexibilité des extrémités des tubes et ainsi permet à ces derniers de mieux résister aux variations de température et donc aux phénomènes de dilatation et de rétractation. Les tubes ainsi que la liaison avec la plaque collectrice peuvent ainsi avoir une meilleure résistance à l'usure et l'échangeur de chaleur peut donc avoir un cycle de vie prolongée.  The presence of these stampings makes it possible to increase the flexibility of the ends of the tubes and thus enables the latter to better withstand temperature variations and therefore the phenomena of expansion and retraction. The tubes as well as the connection with the collector plate can thus have a better wear resistance and the heat exchanger can therefore have an extended life cycle.
Selon un aspect de l'invention, les extrémités des tubes comportent au moins un ensemble d'estampages comprenant : According to one aspect of the invention, the ends of the tubes comprise at least one set of stampings comprising:
0 un premier estampage réalisé à un premier bord d'un premier grand côté, 0 a first embossing performed at a first edge of a first long side,
0 un deuxième estampage réalisé à un premier bord d'un deuxième grand côté, en regard du premier estampage, 0 a second stamping carried out at a first edge of a second long side, opposite the first stamping,
0 un troisième estampage réalisé à un deuxième bord du premier grand côté, ledit troisième estampage étant aligné avec le premier estampage, 0 un quatrième estampage réalisé à un deuxième bord du deuxième grand côté, en regard du troisième estampage. 0 a third stamping carried out at a second edge of the first long side, said third stamping being aligned with the first stamping, 0 a fourth stamping made at a second edge of the second large side, next to the third stamping.
Selon un autre aspect de l'invention, les extrémités des tubes comportent deux ensembles d'estampages parallèles. According to another aspect of the invention, the ends of the tubes comprise two sets of parallel stampings.
Selon un autre aspect de l'invention, les estampages ont une profondeur supérieure à 5 % de l'épaisseur des tubes et inférieure à 25 % de l'épaisseur des tubes. Selon un autre aspect de l'invention, le bord supérieur des estampages est à une distance de la plaque collectrice supérieure à 0mm et inférieure à la moitié de la distance entre la plaque collectrice t les intercalaires. According to another aspect of the invention, the stampings have a depth greater than 5% of the thickness of the tubes and less than 25% of the thickness of the tubes. According to another aspect of the invention, the upper edge of the stampings is at a distance from the header plate greater than 0 mm and less than half the distance between the header plate and the spacers.
Selon un autre aspect de l'invention, les estampages ont une hauteur supérieure à l'épaisseur de la paroi desdits tubes et inférieure à 90 % de la distance entre la plaque collectrice et les intercalaires. According to another aspect of the invention, the stampings have a height greater than the thickness of the wall of said tubes and less than 90% of the distance between the header plate and the spacers.
Selon un autre aspect de l'invention, les estampages ont une longueur supérieure à 20 % de la largeur des tubes et inférieure à 50 % de la largeur des tubes. According to another aspect of the invention, the stampings have a length greater than 20% of the width of the tubes and less than 50% of the width of the tubes.
Selon un autre aspect de l'invention, les estampages présentent un fond plat et parallèle aux grands cotés des tubes. According to another aspect of the invention, the stampings have a flat bottom and parallel to the long sides of the tubes.
Selon un autre aspect de l'invention, les tubes comportent une jambe de renfort disposée au sein desdits tubes et reliant leurs grands côtés et en ce que ladite jambe de renfort est repliée contre l'intérieur d'un grand côté aux extrémités desdits tubes. Selon un autre aspect de l'invention, la jambe de renfort est repliée depuis l'extrémité des tubes jusqu'à une profondeur supérieure à 0mm et inférieure à la moitié de la distance entre la plaque collectrice et les intercalaires. La présente invention concerne également un procédé de fabrication d'un échangeur de chaleur tel que décrit précédemment et comportant une étape d'estampage des extrémité des tubes réalisée immédiatement après l'étape de brasage des tubes et des plaques collectrices. According to another aspect of the invention, the tubes comprise a reinforcing leg disposed within said tubes and connecting their long sides and in that said reinforcing leg is folded against the inside of a large side at the ends of said tubes. According to another aspect of the invention, the reinforcing leg is bent from the end of the tubes to a depth greater than 0 mm and less than half the distance between the collector plate and the spacers. The present invention also relates to a method of manufacturing a heat exchanger as described above and comprising a step of stamping the ends of the tubes made immediately after the step of brazing the tubes and the collector plates.
Selon un aspect du procédé selon l'invention, les tubes comportent une jambe de renfort disposée au sein desdits tubes et ledit procédé comporte une étape de repliage de ladite jambe de renfort. According to one aspect of the method according to the invention, the tubes comprise a reinforcing leg disposed within said tubes and said method comprises a step of folding said reinforcing leg.
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 : 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 montre une représentation schématique d'un échangeur de chaleur, FIG. 1 shows a schematic representation of a heat exchanger,
• la figure 2 montre une représentation schématique en coupe selon le plan de coupe AA d'un collecteur d'un échangeur de chaleur de la figure 1 selon un premier mode de réalisation, FIG. 2 shows a diagrammatic representation in section along the sectional plane AA of a collector of a heat exchanger of FIG. 1 according to a first embodiment,
• la figure 3 montre une représentation schématique en perspective d'une extrémité de tube,  FIG. 3 shows a schematic representation in perspective of a tube end,
• la figure 4 montre une représentation schématique d'un collecteur de l'échangeur de chaleur des figures 1 et 2,  FIG. 4 shows a schematic representation of a collector of the heat exchanger of FIGS. 1 and 2,
· la figure 5 montre une représentation schématique en vue de dessus d'une extrémité de tube,  FIG. 5 shows a schematic representation in plan view of a tube end,
• la figure 6 montre une représentation schématique en perspective d'un collecteur d'un échangeur de chaleur selon un deuxième mode de réalisation, • la figure 7 montre une représentation schématique en perspective de l'intérieur d'un tube, FIG. 6 shows a schematic representation in perspective of a collector of a heat exchanger according to a second embodiment, FIG. 7 shows a schematic representation in perspective of the inside of a tube,
• les figures 8a à 8c montrent une représentation schématique des étapes du procédé de pliage d'une jambe de retenue.  FIGS. 8a to 8c show a schematic representation of the steps of the method of folding a retaining leg.
Les éléments identiques sur les différentes figures, portent les mêmes références. The identical elements in the different figures bear the same references.
Les réalisations suivantes sont des exemples. Bien que la description se réfère à un ou plusieurs modes de réalisation, ceci ne signifie pas nécessairement que chaque référence concerne le même mode de réalisation, ou que les caractéristiques s'appliquent seulement à un seul mode de réalisation. De simples caractéristiques de différents modes de réalisation peuvent également être combinées ou interchangées pour fournir d'autres réalisations. Dans la présente description, on peut indexer certains éléments ou paramètres, comme par exemple premier élément ou deuxième élément ainsi que premier paramètre et deuxième paramètre ou encore premier critère et deuxième critère etc. Dans ce cas, il s'agit d'un simple indexage pour différencier et dénommer des éléments ou paramètres ou critères proches mais non identiques. Cette indexation n'implique pas une priorité d'un élément, paramètre ou critère par rapport à un autre et on peut aisément interchanger de telles dénominations sans sortir du cadre de la présente description. Cette indexation n'implique pas non plus un ordre dans le temps par exemple pour apprécier tels ou tels critères. La figure 1 montre un échangeur de chaleur 1, généralement de forme parallélépipédique, comprenant un faisceau formé d'une multitude de tubes 2 à l'intérieur desquels peut circuler un premier fluide caloporteur. Les tubes 2 sont de section oblongue, définie par un grand axe et un petit axe et sont disposés parallèlement entre eux. Les tubes 2 sont des tubes plats, c'est-à-dire qu'ils présentent deux grands côtés 21a, 21b (visibles sur la figure 3) de surface plane et parallèles au grand axe et deux petits côtés 22a, 22b (visibles sur la figure 2) de surface courbe formant la tranche des tubes 2 et reliant les bords des grands côtés 21a, 21b. Entre les tubes 2, sont disposés des intercalaires 6 contre les grands côtés 21a, 21b qui agissent comme perturbateur et augmentent la surface d'échange thermique avec un deuxième fluide caloporteur passant entre les tubes 2 au travers des intercalaires 6. The following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments may also be combined or interchanged to provide other embodiments. In the present description, it is possible to index certain elements or parameters, such as for example first element or second element as well as first parameter and second parameter or else first criterion and second criterion, etc. In this case, it is a simple indexing to differentiate and name elements or parameters or criteria close but not identical. This indexing does not imply a priority of one element, parameter or criterion with respect to another, and it is easy to interchange such denominations without departing from the scope of the present description. This indexing does not imply either an order in time for example to appreciate such or such criteria. FIG. 1 shows a heat exchanger 1, generally of parallelepipedal shape, comprising a beam formed of a multitude of tubes 2 within which a first heat transfer fluid can circulate. The tubes 2 are of oblong section, defined by a major axis and a minor axis and are arranged parallel to each other. The tubes 2 are flat tubes, that is to say they have two large sides 21a, 21b (visible in Figure 3) of flat surface and parallel to the major axis and two small sides 22a, 22b (visible in Figure 2) of curved surface forming the edge of the tubes 2 and connecting the edges of the long sides 21a , 21b. Between the tubes 2, interleaves 6 are arranged against the long sides 21a, 21b which act as a disrupter and increase the heat exchange surface with a second heat transfer fluid passing between the tubes 2 through the spacers 6.
Les tubes 2 et les intercalaires 6 sont réalisés en métal. Les tubes 2 et les intercalaires 6 formant le faisceau sont fixés entre eux par brasage. Les intercalaires 6 sont par exemple des bandes ondulées ou crénelées, placées entre les tubes 2 et fixées auxdits tubes 2 par brasage. On parle alors de faisceau brasé.  The tubes 2 and the spacers 6 are made of metal. The tubes 2 and the spacers 6 forming the bundle are fixed together by brazing. The spacers 6 are for example corrugated or crenellated strips, placed between the tubes 2 and fixed to said tubes 2 by soldering. This is called a brazed beam.
L'échangeur de chaleur 1 comporte également deux collecteurs 3 ou boites à eau, un collecteur 3 étant disposé à chaque extrémité des tubes 2. Ces collecteurs 3 comportent chacun une plaque collectrice 4 et un couvercle 8 venant recouvrir la plaque collectrice 4 et refermer le collecteur 3. Ces collecteurs 3 permettent la collecte et/ou la distribution du premier fluide caloporteur afin qu'il circule dans les tubes 2. The heat exchanger 1 also comprises two manifolds 3 or water boxes, a manifold 3 being disposed at each end of the tubes 2. These manifolds 3 each comprise a header plate 4 and a cover 8 coming to cover the header plate 4 and close the 3. These collectors 3 allow the collection and / or distribution of the first heat transfer fluid so that it circulates in the tubes 2.
La plaque collectrice 4 fait la liaison de façon étanche entre le collecteur 3 et le faisceau de tubes 2. De plus, la plaque collectrice 4 peut être de forme générale rectangulaire. La plaque collectrice 4 comporte également une multitude d'orifices ayant une forme correspondant à la forme de la section des tubes 2 et aptes à recevoir les extrémités des tubes 2. Les tubes 2 sont fixés à la plaque collectrice 4 de façon étanche par brasage.  The header plate 4 is sealingly connected between the collector 3 and the bundle of tubes 2. In addition, the header plate 4 may be of generally rectangular shape. The collector plate 4 also comprises a multitude of orifices having a shape corresponding to the shape of the section of the tubes 2 and able to receive the ends of the tubes 2. The tubes 2 are fixed to the collector plate 4 in a sealed manner by brazing.
Les tubes 2, les intercalaires 6 ainsi que les plaques collectrices 4 étant brasés, ces derniers sont réalisés dans un matériau métallique notamment en aluminium ou alliage d'aluminium. On parle alors d'échangeur de chaleur 1 brasé.  The tubes 2, the spacers 6 and the collector plates 4 being brazed, the latter are made of a metal material including aluminum or aluminum alloy. This is called a heat exchanger 1 brazed.
Comme illustré à la figure 2 qui est une représentation schématique d'une coupe transversale d'un collecteur 3 selon le plan de coupe AA de la figure 1, la plaque collectrice 4 comporte sur toute sa périphérie un rebord 41 remontant vers le couvercle 8 de sorte à former une gorge 42 dans laquelle vient s'insérer le couvercle 8. Un joint (non représenté) est inséré dans cette gorge 44 afin d'assurer l'étanchéité entre le couvercle 8 et la plaque collectrice 4. Le couvercle 8 est maintenu contre la plaque collectrice 4 par des pattes de sertissage 43 disposées sur le rebord 41 et repliées sur un épaulement 80 du couvercle 8. As illustrated in Figure 2 which is a schematic representation of a cross section of a manifold 3 according to the cutting plane AA of Figure 1, the header plate 4 has on its entire periphery a flange 41 upward towards the lid 8 so as to form a groove 42 in which is inserted the cover 8. A seal (not shown) is inserted into the groove 44 to seal between the cover 8 and the header plate 4. The cover 8 is held against the collector plate 4 by crimping tabs 43 disposed on the flange 41 and folded over a shoulder 80 of the cover 8.
Comme illustré sur les figures 2 à 6, la surface des grands côtés 21a, 21b des tubes 2 comporte des estampages 25 s 'étendant depuis les bords des grands côtés 21a, 21b et se prolongeant en direction du centre desdits grands côtés 21a, 21b. Par bords des grands côtés 21a, 21b, on entend ici les bords faisant la liaison avec les petits côtés 22a, 22b. Ces estampages 25 sont réalisés aux extrémités des tubes 2, entre les extrémités des intercalaires 6 et la plaque collectrice 4. Ces estampages 25 sont des amincissement locaux de l'épaisseur E des tubes (visible notamment sur la figure 5) entre les deux grands côtés 21a et 21b. As illustrated in Figures 2 to 6, the surface of the long sides 21a, 21b of the tubes 2 comprises stampings 25 extending from the edges of the long sides 21a, 21b and extending towards the center of said long sides 21a, 21b. By edges of the long sides 21a, 21b is meant here the edges making the connection with the short sides 22a, 22b. These stampings 25 are made at the ends of the tubes 2, between the ends of the spacers 6 and the collector plate 4. These stampings 25 are local thinning of the thickness E of the tubes (visible in particular in Figure 5) between the two long sides 21a and 21b.
La présence de ces estampages 25 permet d'augmenter la flexibilité des extrémités des tubes 2 et ainsi permet à ces derniers de mieux résister aux variations de température et donc aux phénomènes de dilatation et de rétractation. Les tubes 2 ainsi que la liaison avec la plaque collectrice 4 peuvent ainsi avoir une meilleure résistance à l'usure et l'échangeur de chaleur 1 peut donc avoir un cycle de vie prolongée.  The presence of these stampings 25 increases the flexibility of the ends of the tubes 2 and thus allows the latter to better withstand temperature variations and therefore the phenomena of expansion and retraction. The tubes 2 and the connection with the collector plate 4 can thus have a better wear resistance and the heat exchanger 1 can therefore have an extended life cycle.
Les estampages 25 peuvent présenter un fond plat et parallèle aux grands cotés 21a, 21b des tubes 2. Les estampages 25 peuvent notamment avoir un profil rectangulaire, comme illustré aux figures 2 et 3. Plus précisément, les extrémités des tubes 2 peuvent comporter au moins un ensemble d'estampages 25. Un ensemble d'estampage 25 comprend quatre estampages 25 disposés de la façon suivante : 0 un premier estampage 25 réalisé à un premier bord d'un premier grand côté 21a, The stampings 25 may have a flat bottom and parallel to the long sides 21a, 21b of the tubes 2. The stampings 25 may in particular have a rectangular profile, as shown in Figures 2 and 3. More specifically, the ends of the tubes 2 may comprise at least 25. An embossing assembly 25 comprises four stampings 25 arranged in the following manner: 0 a first stamping 25 carried out at a first edge of a first major side 21a,
0 un deuxième estampage 25 réalisé à un premier bord d'un deuxième grand côté 21b, en regard du premier estampage 25, 0 a second stamping 25 carried out at a first edge of a second main side 21b, opposite the first stamping 25,
0 un troisième estampage 25 réalisé à un deuxième bord du premier grand côté A third embossing 25 made at a second edge of the first large side
21a, ledit troisième estampage 25 étant aligné avec le premier estampage 25, et 21a, said third stamping 25 being aligned with the first stamping 25, and
0 un quatrième estampage 25 réalisé à un deuxième bord du deuxième grand côté 21b, en regard du troisième estampage 25. 0 a fourth stamping 25 carried out at a second edge of the second main side 21b, opposite the third 25 embossing.
La figure 4 montre plus précisément comment sont positionnés les estampages 25 dans l'espace entre la plaque collectrice 4 et l'extrémité des intercalairess 6 (non représentées sur la figure 4). Figure 4 shows more precisely how the stampings are positioned in the space between the header plate 4 and the end of the spacers 6 (not shown in Figure 4).
Comme la figure 4 le montre, le bord supérieur des estampages 25 est de préférence à une distance Dl de la plaque collectrice 4 supérieure à 0mm et inférieure à la moitié de la distance D2 entre la plaque collectrice 4 et les intercalaires 6, afin que l'estampage 25 reste au plus proche de la plaque collectrice 4 pour permettre une augmentation de la flexibilité des tubes 2 à ce niveau et absorber les phénomènes de dilatation et de rétractation. Par bord supérieur des estampages 25, on entend le bord des estampages 25 le plus proche de la plaque collectrice 4.  As shown in FIG. 4, the upper edge of the stampings 25 is preferably at a distance D 1 from the collecting plate 4 greater than 0 mm and less than half the distance D 2 between the collecting plate 4 and the spacers 6, so that the The stamping 25 remains as close as possible to the manifold plate 4 to allow an increase in the flexibility of the tubes 2 at this level and to absorb the phenomena of expansion and retraction. By the upper edge of the stampings 25 is meant the edge of the stampings 25 closest to the header plate 4.
Les estampages 25 ont une hauteur H supérieure à l'épaisseur de la paroi desdits tubes 2 afin que les estampages 25 apportent suffisamment de flexibilité. Cette hauteur H peut aller jusqu'à 90 % de la distance D2 entre la plaque collectrice (4) et les intercalaires 6.  The stampings 25 have a height H greater than the thickness of the wall of said tubes 2 so that the stampings 25 provide sufficient flexibility. This height H can go up to 90% of the distance D2 between the collector plate (4) and the spacers 6.
Les estampages 25 peuvent avoir une longueur Ll supérieure à 20 % de la largeur L2 des tubes 2 et inférieure à 50 % de la largeur L2 des tubes 2. Une telle longueur Ll permet un compromis entre l'augmentation de la flexibilité et l'augmentation des pertes de charges. En effet, plus les estampages 25 ont une longueur Ll élevée, plus les pertes de charges seront élevées du fait que les extrémités des tubes 2 présentent un étranglement important. The stampings 25 may have a length L1 greater than 20% of the width L2 of the tubes 2 and less than 50% of the width L2 of the tubes 2. Such a length L1 allows a compromise between the increase of the flexibility and the increase loss of charges. Indeed, the more stampings 25 have a length Ll high, plus the pressure losses will be high because the ends of the tubes 2 have a significant throttling.
De plus, une telle longueur Ll est particulièrement utile lorsque les tubes 2 comportent une jambe de renfort 27 (visible sur les figures 2 à 5) en leur centre. Cette jambe de renfort 27 relie entre eux les grands côtés 21a, 21b des tubes 2. Les estampages 25 ne chevauchent ainsi pas cette jambe de renfort 27. Une telle jambe de renfort 27 peut notamment être présente dans des tubes 2 formés par une plaque repliée sur elle même et brasée de sorte à former le tube 2. Les estampages 25 peuvent également avoir une profondeur PI supérieure à 5 % de l'épaisseur E des tubes 2 et inférieure à 25 % de l'épaisseur E des tubes 2, comme illustré sur la figure 5. Cette profondeur PI permet un compromis entre l'augmentation de la flexibilité et l'augmentation des pertes de charges. Comme illustré sur les figures 2 à 4, les extrémités des tubes 2 peuvent comporter un seul ensemble d'estampage 25. Un tel mode de réalisation peut permettre une prolongation du cycle de vie de l'échangeur de chaleur 1 de l'ordre de 43 %.  In addition, such a length L1 is particularly useful when the tubes 2 comprise a reinforcing leg 27 (visible in Figures 2 to 5) in their center. This reinforcing leg 27 interconnects the long sides 21a, 21b of the tubes 2. The stampings 25 thus do not overlap this reinforcing leg 27. Such a reinforcing leg 27 may in particular be present in tubes 2 formed by a folded plate on itself and brazed so as to form the tube 2. The stampings 25 may also have a depth P 1 greater than 5% of the thickness E of the tubes 2 and less than 25% of the thickness E of the tubes 2, as illustrated. in FIG. 5. This PI depth allows a compromise between the increase of the flexibility and the increase of the losses of loads. As illustrated in Figures 2 to 4, the ends of the tubes 2 may comprise a single stamping assembly 25. Such an embodiment may allow an extension of the life cycle of the heat exchanger 1 of the order of 43 %.
Comme illustré sur la figure 6, les extrémités des tubes 2 peuvent comporter deux ensembles d'estampages 25 parallèles. Un tel mode de réalisation peut permettre une prolongation du cycle de vie de l'échangeur de chaleur 1 de l'ordre de 84 %. As illustrated in FIG. 6, the ends of the tubes 2 may comprise two sets of parallel stampings. Such an embodiment may allow an extension of the life cycle of the heat exchanger 1 of the order of 84%.
Dans le cas où les tubes 2 comportent une jambe de renfort 27 disposée en leur sein, ladite jambe de renfort 27 peut être repliée contre l'intérieur d'un grand côté 21a, 21b aux extrémités desdits tubes 2 comme illustré sur les figures 3 et 4 ainsi que 7 à 8c. En effet, cette jambe de renfort 27 apporte de la rigidité au tube 2 et donc le fait que la jambe de renfort 27 soit repliée au niveau des extrémités des tubes 2 donne une meilleur flexibilité aux extrémités des tubes 2 afin d'absorber les phénomènes de dilatation et de rétractation. La jambe de renfort 27 peut notamment être repliée contre l'intérieur d'un grand côté 21a, 21b depuis l'extrémité des tubes 2 jusqu'à une profondeur P2 (visible sur la figure 4) supérieure à 0mm et inférieure à la moitié de la distance D2 entre la plaque collectrice (4) et les intercalaires 6. Le repliement de la jambe de renfort 27 et la distance Dl et la longueur Ll des estampages 25 sont adaptées afin que les estampages 25 et la jambe de renfort 27 repliée ne rentrent pas en contact et ne se gênent pas l'un l'autre. De préférence, la profondeur P2 est telle que le repliement de la jambe de renfort 27 va au-delà de la plaque collectrice 4 afin de pouvoir englober la zone de liaison brasée entre les tubes 2 et la plaque collectrice 4. In the case where the tubes 2 comprise a reinforcing leg 27 disposed within them, said reinforcing leg 27 can be folded against the inside of a large side 21a, 21b at the ends of said tubes 2 as illustrated in FIGS. 4 and 7 to 8c. Indeed, this reinforcing leg 27 provides rigidity to the tube 2 and therefore the fact that the reinforcing leg 27 is folded at the ends of the tubes 2 gives greater flexibility to the ends of the tubes 2 to absorb the phenomena of dilation and retraction. The reinforcing leg 27 can in particular be folded against the inside of a large side 21a, 21b from the end of the tubes 2 to a depth P2 (visible in FIG. 4) greater than 0mm and less than half of the distance D2 between the collector plate (4) and the inserts 6. The folding of the reinforcing leg 27 and the distance D1 and the length L1 of the stampings 25 are adapted so that the stampings 25 and the folded reinforcement leg 27 do not fit. not in contact and do not interfere with each other. Preferably, the depth P2 is such that the folding of the reinforcing leg 27 goes beyond the header plate 4 in order to be able to encompass the brazed connection zone between the tubes 2 and the header plate 4.
La présente invention concerne également un procédé de fabrication d'un échangeur de chaleur 1 brasé tel que décrit précédemment. Dans un procédé de fabrication classique, les tubes 2 sont fixés dans les orifices de la plaque collectrice 4 lors d'une étape de brasage. Le procédé de fabrication selon l'invention comporte une étape d'estampage des extrémités des tubes 2 dans l'espace entre la plaque collectrice 4 et l'extrémité des intercalaires 6. The present invention also relates to a method of manufacturing a brazed heat exchanger 1 as described above. In a conventional manufacturing process, the tubes 2 are fixed in the orifices of the header plate 4 during a soldering step. The manufacturing method according to the invention comprises a step of stamping the ends of the tubes 2 in the space between the collector plate 4 and the end of the spacers 6.
Cette étape d'estampage est préférentiellement réalisée immédiatement après l'étape de brasage des tubes 2 et des plaques collectrices 4 afin de profiter du fait que les tubes 2 soient encore malléables et que l'impact d'un tel estampage puisse être absorbé sans altérer la liaison entre les tubes 2 et la plaque collectrice 4.  This stamping step is preferably carried out immediately after the brazing step of the tubes 2 and the collector plates 4 in order to take advantage of the fact that the tubes 2 are still malleable and that the impact of such stamping can be absorbed without altering the connection between the tubes 2 and the collector plate 4.
Dans le cas où les tubes 2 comportent une jambe de renfort 27 disposée en leur sein, le procédé de fabrication peut également comporter une étape de pliage de ladite jambe de renfort 27. La figure 8a montre une extrémité de tube 2 après sa formation et présentant une jambe de retenue 27 reliant ses grands côtés 21a, 21b. La figure 8b montre l'étape de pliage qui peut notamment être réalisée au moyen d'un outil biseauté k s'insérant dans le tube 2 comme illustré aux figures 8a à 8c. La figure 8c montre l'extrémité du tube 2 une fois la jambe de retenue 27 repliée. Ainsi, on voit bien que l'échangeur de chaleur 1 brasé selon l'invention, du fait de la présence des estampages 25, a des tubes 2 dont les extrémités sont plus flexibles et plus aptes à absorber les phénomènes de dilatation et de rétractation et donc d'avoir un cycle de vie prolongé. In the case where the tubes 2 comprise a reinforcing leg 27 disposed within them, the manufacturing method may also include a step of folding said reinforcing leg 27. FIG. 8a shows a tube end 2 after its formation and exhibiting a retaining leg 27 connecting its long sides 21a, 21b. FIG. 8b shows the folding step which can in particular be carried out by means of a beveled tool k inserted into the tube 2 as illustrated in FIGS. 8a to 8c. Figure 8c shows the end of the tube 2 once the retaining leg 27 folded. Thus, it can clearly be seen that the brazed heat exchanger 1 according to the invention, because of the presence of the stampings 25, has tubes 2 whose ends are more flexible and more able to absorb the phenomena of expansion and retraction and therefore to have an extended life cycle.

Claims

REVENDICATIONS
Échangeur de chaleur (1) brasé comprenant : Brazed heat exchanger (1) comprising:
0 un faisceau de tubes (2) comportant une multitude de tubes (2) disposés parallèlement les uns aux autres, ledit faisceau de tubes (2) comportant des intercalaires (6) disposés entre les tubes (2), les tubes (2) comportant deux grands côtés (21a, 21b) et deux petits côtés (22a, 22b) reliant les bords desdits grands côtés (21a, 21b), 0 a bundle of tubes (2) having a plurality of tubes (2) arranged parallel to each other, said tube bundle (2) comprising interlayers (6) disposed between the tubes (2), the tubes (2) having two long sides (21a, 21b) and two short sides (22a, 22b) connecting the edges of said long sides (21a, 21b),
0 deux collecteurs (3), un collecteur (3) étant disposé de chaque côté du faisceau de tubes (2), chaque collecteur (3) comportant une plaque collectrice (4), ladite plaque collectrice (4) comprenant des orifices à l'intérieur desquels sont introduits les extrémités des tubes (2), 0 two collectors (3), a collector (3) being disposed on each side of the tube bundle (2), each collector (3) having a collector plate (4), said collector plate (4) comprising orifices to the inside which are introduced the ends of the tubes (2),
caractérisé en ce que la surface des grands côtés (21a, 21b) des tubes (2) comporte des estampages (25) s'étendant depuis les bords des grands côtés (21a, 21b) et se prolongeant en direction du centre desdits grands côtés (21a, 21b), lesdits estampages (25) étant réalisés aux extrémités des tubes (2), entre les extrémités des intercalaires (6) et la plaque collectrice (4). characterized in that the surface of the long sides (21a, 21b) of the tubes (2) comprise stampings (25) extending from the edges of the long sides (21a, 21b) and extending towards the center of said long sides ( 21a, 21b), said stampings (25) being made at the ends of the tubes (2), between the ends of the spacers (6) and the collector plate (4).
Échangeur de chaleur (1) brasé selon la revendication précédente, caractérisé en ce que les extrémités des tubes Brazed heat exchanger (1) according to the preceding claim, characterized in that the ends of the tubes
(2) comportent au moins un ensemble d'estampages (25) comprenant : (2) comprise at least one set of stampings (25) comprising:
0 un premier estampage (25) réalisé à un premier bord d'un premier grand côté (21a), 0 a first stamping (25) directed to a first edge of a first side (21a),
0 un deuxième estampage (25) réalisé à un premier bord d'un deuxième grand côté (21b), en regard du premier estampage (25), 0 un troisième estampage (25) réalisé à un deuxième bord du premier grand côté (21a), ledit troisième estampage (25) étant aligné avec le premier estampage (25), 0 a second stamping (25) directed to a first edge of a second side (21b) facing the first stamping (25) 0 a third stamping (25) directed to a second edge of the first longitudinal side (21a), said third stamping (25) being aligned with the first stamping (25)
0 un quatrième estampage (25) réalisé à un deuxième bord du deuxième grand côté (21b), en regard du troisième estampage (25). 0 a fourth stamping (25) directed to a second edge of the second side (21b) facing the third stamping (25).
3. Échangeur de chaleur (1) brasé selon l'une des revendications précédentes, caractérisé en ce que les estampages (25) ont une profondeur (PI) supérieure à 5 % de l'épaisseur (E) des tubes (2) et inférieure à 25 % de l'épaisseur (E) des tubes (2). Brazed heat exchanger (1) according to one of the preceding claims, characterized in that the stampings (25) have a depth (PI) greater than 5% of the thickness (E) of the tubes (2) and lower at 25% of the thickness (E) of the tubes (2).
4. Échangeur de chaleur (1) brasé selon l'une des revendications précédentes, caractérisé en ce que le bord supérieur des estampages (25) est à une distance (Dl) de la plaque collectrice (4) supérieure à 0mm et inférieure à la moitié de la distance (D2) entre la plaque collectrice (4) et les intercalaires (6). Brazed heat exchanger (1) according to one of the preceding claims, characterized in that the upper edge of the stampings (25) is at a distance (D1) from the collecting plate (4) greater than 0 mm and less than half of the distance (D2) between the collector plate (4) and the spacers (6).
5. Échangeur de chaleur (1) brasé selon l'une des revendications précédentes, caractérisé en ce que les estampages (25) ont une hauteur (H) supérieure à l'épaisseur de la paroi desdits tubes (2) et inférieure à 90 % de la distance (D2) entre la plaque collectrice (4) et les intercalaires (6). Brazed heat exchanger (1) according to one of the preceding claims, characterized in that the stampings (25) have a height (H) greater than the wall thickness of said tubes (2) and less than 90%. the distance (D2) between the header plate (4) and the spacers (6).
6. Échangeur de chaleur (1) brasé selon l'une des revendications précédentes, caractérisé en ce que les estampages (25) ont une longueur (Ll) supérieure à 20 % de la largeur (L2) des tubes (2) et inférieure à 50 % de la largeur (L2) des tubes (2). Brazed heat exchanger (1) according to one of the preceding claims, characterized in that the stampings (25) have a length (L1) greater than 20% of the width (L2) of the tubes (2) and less than 50% of the width (L2) of the tubes (2).
Échangeur de chaleur (1) brasé selon l'une des revendications précédentes, caractérisé en ce que les tubes (2) comportent une jambe de renfort (27) disposée au sein desdits tubes (2) et reliant leurs grands côtés (21a, 21b) et en ce que ladite jambe de renfort (27) est repliée contre l'intérieur d'un grand côté (21a, 21b) aux extrémités desdits tubes (2). Brazed heat exchanger (1) according to one of the preceding claims, characterized in that the tubes (2) comprise a reinforcing leg (27) disposed within said tubes (2) and connecting their long sides (21a, 21b). and in that said reinforcing leg (27) is folded against the inside of a long side (21a, 21b) at the ends of said tubes (2).
Échangeur de chaleur (1) brasé selon la revendication précédente, caractérisé en ce que la jambe de renfort (27) est repliée depuis l'extrémité des tubes (2) jusqu'à une profondeur (P2) supérieure à 0mm et inférieure à la moitié de la distance (D2) entre la plaque collectrice (4) et les intercalaires (6). Brazed heat exchanger (1) according to the preceding claim, characterized in that the reinforcing leg (27) is folded from the end of the tubes (2) to a depth (P2) greater than 0mm and less than half the distance (D2) between the header plate (4) and the spacers (6).
Procédé de fabrication d'un échangeur de chaleur selon l'une des revendications 1 à 8 caractérisé en ce qu'il comporte une étape d'estampage des extrémité des tubes (2) réalisée immédiatement après l'étape de brasage des tubes (2) et des plaques collectrices (4). A method of manufacturing a heat exchanger according to one of claims 1 to 8 characterized in that it comprises a step of stamping the ends of the tubes (2) made immediately after the step of brazing the tubes (2) and collector plates (4).
10. Procédé de fabrication d'un échangeur de chaleur selon la revendication précédente caractérisé en ce que les tubes (2) comportent une jambe de renfort (27) disposée au sein desdits tubes (2) et que ledit procédé comporte une étape de repliage de ladite jambe de renfort (27). 10. A method of manufacturing a heat exchanger according to the preceding claim characterized in that the tubes (2) comprise a reinforcing leg (27) disposed within said tubes (2) and said method comprises a folding step of said reinforcing leg (27).
PCT/FR2018/050398 2017-02-23 2018-02-20 Brazed heat exchanger and associated manufacturing method WO2018154227A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1751458 2017-02-23
FR1751458A FR3063026B1 (en) 2017-02-23 2017-02-23 BRASE HEAT EXCHANGER AND ASSOCIATED MANUFACTURING METHOD.

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070287334A1 (en) * 2006-06-13 2007-12-13 Calsonic Kansei Corporation Flat tube adapted for heat exchanger
US20130075070A1 (en) * 2011-09-23 2013-03-28 William Home Heat exchanger tube
US20140060504A1 (en) * 2012-09-06 2014-03-06 Senior Ip Gmbh Exhaust Gas Recirculation Apparatus and Method for Forming Same
DE102012217333A1 (en) * 2012-09-25 2014-03-27 Behr Gmbh & Co. Kg flat tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070287334A1 (en) * 2006-06-13 2007-12-13 Calsonic Kansei Corporation Flat tube adapted for heat exchanger
US20130075070A1 (en) * 2011-09-23 2013-03-28 William Home Heat exchanger tube
US20140060504A1 (en) * 2012-09-06 2014-03-06 Senior Ip Gmbh Exhaust Gas Recirculation Apparatus and Method for Forming Same
DE102012217333A1 (en) * 2012-09-25 2014-03-27 Behr Gmbh & Co. Kg flat tube

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FR3063026A1 (en) 2018-08-24
FR3063026B1 (en) 2019-05-10

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