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
  • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
  • F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D53/00—Making other particular articles
  • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K1/00—Soldering, e.g. brazing, or unsoldering
  • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
  • B23K1/0012—Brazing heat exchangers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
  • F28F9/02—Header boxes; End plates
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
  • F28F9/02—Header boxes; End plates
  • F28F9/0202—Header boxes having their inner space divided by partitions
  • F28F9/0204—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions
  • F28F9/0209—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions having only transversal partitions
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
  • F28F9/02—Header boxes; End plates
  • F28F9/04—Arrangements for sealing elements into header boxes or end plates
  • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
  • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
  • B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
  • F28F9/02—Header boxes; End plates
  • F28F2009/0285—Other particular headers or end plates

Definitions

• Slip box for heat exchanger in particular for a motor vehicle, heat exchanger and corresponding manufacturing method
• the field of the invention is that of heat exchangers, and more particularly that of collector boxes for heat exchanger.
• the invention applies in particular, but not exclusively, to heat exchangers mounted in the cooling circuit of the batteries of vehicles with electric or hybrid motorization.
• a heat exchanger for the automobile comprises, in the usual way, a bundle of heat exchange tubes which are rectilinear and of the same length. These tubes 3 are placed parallel to each other and aligned so as to form a single row in which a coolant, such as brine, is intended to circulate, to allow heat exchange with the surrounding air flow passing between the tubes.
• a coolant such as brine
• the tubes are usually joined to each other at each of their ends by a common plate called “collector plate” or “plate with holes” provided with openings receiving the tubes.
• the tubes are then secured to the plate in a sealed manner, by mechanical forming or by brazing.
• Such a technique therefore has the first disadvantage of not being adaptable to dimensional variations of the tubes.
• the perforated plates can in fact be implemented, taking into account the pre-dimensioning of their openings, with tubes of a given section.
• the header plate is capped by a "fluid box” also called “water box” or “lid”, secured in a sealed manner to the plate.
• the fluid boxes are also connected to the inlet and outlet pipes of the coolant.
• the whole forms a collecting box ensuring the collection and the distribution of the heat transfer fluid in the different tubes according to a predetermined circulation diagram.
• the collector plate has raised edges, a peripheral portion is crimped around the fluid box to close the assembly.
• the header plate and the fluid box may be brazed in a region around the periphery thereof bearing the crimping teeth.
• the seal with the outside is then exclusively provided by a seal disposed in a groove of the header plate, this seal being compressed by crimping the plate on the fluid box.
• the respect of crimping dimensions conditions the compression ratio of the seal, and thus the final seal of the assembly.
• the crimping operation involves, at the level of the peripheral edge portion of the header plate, the application of a very large force that can cause the deformation of the fluid box and thus prevent subsequent proper soldering .
• the present invention aims to solve the aforementioned drawbacks.
• the invention proposes a manifold for a heat exchanger, in particular for a motor vehicle, defining at least one heat transfer fluid circulation cavity and comprising at least one opening for sealingly receiving an end of a heat transfer fluid.
• heat exchange tube or heat transfer fluid communicating with said at least one cavity.
• the collecting box consists of at least one strip of material folded on itself about its longitudinal axis, said at least one cavity being closed by the connection of two facing beads formed on the two longitudinal edges of the strip and said at least one opening being formed by two notches vis-à-vis formed symmetrically with respect to said longitudinal axis on the two longitudinal edges of the strip.
• the invention thus relies on a novel and inventive concept of providing a heat sink of a heat exchanger of simple design (requiring less operations than the known solutions in this case), having excellent sealing and adaptable to different thicknesses heat exchange tubes.
• the manifold is formed by folding a strip of material (aluminum, for example) whose longitudinal edges each have a bead which are in sealing contact with each other on certain portions. Of the band.
• edges of the strip have, moreover, at predetermined intervals and symmetrically with respect to the longitudinal axis of the strip, notches which once the folded strip define radial openings in which one end of the tubes can be inserted in a sealed manner.
• the beads are assembled by brazing.
• each of the beads is formed by a fold flat to a longitudinal edge of the strip, extending inwardly of the cavity.
• each of the beads (B) is formed by a first flat fold of a longitudinal edge of the strip, extending towards the interior of the cavity, and at least one second fold to flat extending outwardly of the cavity and being superimposed on the first fold.
• the longitudinal edges of the strip are thus folded at least once to each form a bead.
• the number of plies applied to the free edges of the strip is chosen (the thickness of the heat exchanger tubes corresponds to the height of the cavity of the collecting box).
• the greater the thickness of the tubes the greater the number of folds forming the beads is important.
• the flat-to-flat juncture of the folded edges of the band optimizes the brazed connection and the seal of the manifold on the zones without tube.
• said notches each comprise a lug extending in the corresponding notch along the longitudinal axis and forming an abutment for introducing a heat exchange tube.
• the introduction openings of the tubes of the manifold have pins forming a stop so that it is possible to control the degree of penetration of the tubes in the cavity of the manifold.
• the lugs are formed in said slots at the first and second free longitudinal edges. According to a particular aspect of the invention, the lugs are formed midway between the bottom of said notches and the first and second free longitudinal edges respectively.
• said at least one opening has a longitudinal slot shape.
• the internal section of said at least one opening is substantially identical to the outer section of a heat exchange tube.
• the invention also relates to a method for manufacturing a heat exchanger collector box, in particular for a motor vehicle, defining at least one circulation cavity for a heat-transfer fluid and comprising at least one opening for receiving an end of a heat exchanger. a heat exchange tube communicating with said at least one cavity, said method comprising:
• the manufacturing method further comprises:
• the step of forming a bead comprises a step of folding the longitudinal edges of the strip flat.
• the beads are thinned, preferably by rolling, before they are brought into contact with each other.
• the invention also relates to a heat exchanger, particularly for a motor vehicle, comprising at least one header box as described above and at least one heat exchange tube, or obtainable by the method as described above.
• Figure 2 Partial schematic view of a strip, before shaping, intended to form a manifold according to a first embodiment
• Figure 3 Schematic view of the successive steps of shaping a manifold according to the invention.
• FIG. 4A schematic view of a first cross section of a manifold according to a first embodiment, after shaping
• Figure 4B schematic view of a second cross section of a manifold according to the first embodiment, after shaping
• FIG. 5 schematic sectional view, along the axis A-A of Figure 4B, the assembly formed by a header box according to a first embodiment and the end of a heat exchange tube;
• Figure 6A schematic view of a first cross section of a manifold according to a second embodiment, after shaping
• Figure 6C Partial schematic view of a strip, before shaping, for forming the manifold according to the second embodiment.
• the general principle of the invention lies in the provision of a collector box obtained from a folded strip and whose free longitudinal edges are foldable around each of the tubes of a heat exchange bundle.
• a collector box obtained from a folded strip and whose free longitudinal edges are foldable around each of the tubes of a heat exchange bundle.
• Figure 1 shows a heat exchanger 1 for equipping a hybrid or electric motor vehicle for cooling one or more batteries forming a power source for driving the motor vehicle.
• the heat exchanger 1 comprises a bundle 2 of tubes, or heat exchange conduits 3, which are rectilinear and of the same length. These tubes 3 are placed parallel to each other and aligned so as to form a single row in which a cooling liquid, such as brine, is intended to circulate.
• a cooling liquid such as brine
• the tubes 3 have a cross section of substantially oblong shape.
• these heat exchange tubes have a cylindrical shape or any other form known from the state of the art.
• These tubes 3 have, in this example, a plurality of channels (not visible) juxtaposed liquid circulation.
• the bundle 2 of tubes 3 comprises a first end and a second end.
• the first end of the bundle 2 of tubes 3 is intended to be assembled with a first manifold 41 and the second end of bundle 2 of tubes 3 is intended to be assembled with a second manifold 42.
• the manifolds 41, 42 define a volume in which the tubes 3 of the bundle 2 open.
• Each manifold 41, 42 is thus in fluid communication with the tubes 3.
• the fluid inlet and the fluid outlet are arranged at the same manifold.
• This manifold is connected to inlet and outlet pipes (not shown) of a heat transfer fluid.
• the manifolds 41, 42 thus ensure the distribution and collection of the coolant in the various tubes 3 of the bundle 2, according to a predetermined circulation scheme.
• the heat transfer fluid can thus absorb heat emitted by the battery to cool it.
• the heat transfer fluid can also, if necessary, bring heat to warm the battery.
• the tubes 3 are intended to be in mechanical contact or not with at least one battery of the vehicle, and are advantageously made of a thermally conductive material, such as a metallic material, for example aluminum or aluminum alloy.
• the heat exchanger 1 is thus positioned directly in contact with the battery or batteries at the bottom of the protective housing and traversed by a heat transfer fluid, or indirectly in contact with the battery or batteries in the case of a heat exchanger placed at the outside of the battery protection box.
• Figure 2 illustrates a portion of a metal strip for forming a header box 4 according to a first embodiment.
• the metal strip 5, made of aluminum for example, is of rectangular overall shape and extends along a longitudinal axis X.
• the strip 5 is composed of a plastic material or any other known material having the mechanical and thermal properties necessary for its shaping and its use for the distribution of heat transfer fluid.
• This band 5 is divided on either side of the longitudinal axis X into a first part 6a and a second part 6b which each extend transversely to a free edge 7a, 7b respectively.
• These free edges 7a, 7b comprise several notches, or notches, 8a, 8b which are spaced, regularly, parallel to the longitudinal axis X, and arranged symmetrically with respect to this axis.
• the free edge 7a of the first portion 6a comprises a notch 8a whose periphery is defined by two lateral portions 8a 'which extend transversely to a longitudinal bottom portion 8a ".
• the lateral portions 8a define the depth of the notch 8a and its bottom portion 8a "defines the width.
• notch 8a Opposite the notch 8a is disposed a notch 8b formed in the free edge 7b of the second portion 6b and of identical dimensions.
• notches 8a, 8b, once the strip 5 shaped so as to form a manifold 4, are intended to form openings, or recess, O introduction and passage of heat exchange tubes 3 (Figure 4C ), these openings O having a contour corresponding to that of a cross section of the tubes 3.
• the openings O take the form of a slot extending along the longitudinal axis of the manifold 4.
• the notch 8a is of rectangular shape, the lateral portions 8a 'being perpendicular to the bottom portion 8a ".
• the bottom portion 8a "additionally has a length equal to or slightly greater than the width of the corresponding tube 3, which is flat type in this example.
• the inner section of the opening (O) is substantially identical to the outer section of a heat exchange tube (3).
• the distance separating two consecutive notches 8a, 8b of the same edge 7a, 7b is equal to the distance separating two consecutive tubes 3 of the bundle 2.
• each of the lateral portions 8a 'of a notch 8a comprises, at the free edge 7a, a stop lug 9 projecting into the notch 8a in the longitudinal direction X.
• the notches 8b have identical lugs 9. The lugs 9 of the same notch are therefore face.
• the first and second parts 6a, 6b have, before shaping of the band 5, an axial symmetry with respect to the axis longitudinal X of the strip 5, and after forming the strip 5, a planar symmetry with respect to a longitudinal median plane P of the manifold 4.
• the free edge 7a, 7b located on each side of a notch 8a, 8b is intended to be folded one or more times flat, so as to form a bead B.
• each free edge 7a, 7b are intended to come into contact with each other once the band 5 shaped, then to be joined by brazing.
• a manifold 4 according to the first embodiment is first shaped by successive bends of the strip 5, before it can be assembled with the flat tubes 3 of the heat exchange bundle 2.
• the rectangular strip 5 is thus pre-cut so as to form notches 8a, 8b.
• the shaping method of the header box 4 comprises a step S1 of flat folding of the free edges 7a, 7b of the strip 5, followed by a folding step S2 of the strip 5 around its longitudinal axis X.
• the free edges 7a, 7b extending on either side of the notches 8a, 8b, are folded flat to form respectively a bead B whose thickness is a function of the number of folds done.
• the thickness of the beads B determines the height of the manifold 4.
• the free edges 7a, 7b of the strip 5 are thus folded flat once towards the center of the strip 5, that is to say towards the longitudinal axis X.
• the beads B of each free edge 7a, 7b may be thinned, preferably by rolling, so that the thickness of the beads B is less than twice the thickness of the strip. This makes it possible to have flexibility of adaptation to the height of the heat exchange tubes.
• the band 5 is then folded (step S2) around its longitudinal axis X so that the beads B are arranged vis-a-vis and brought into contact with each other, as illustrated in FIG. cross-sectional view of Figure 4B.
• the folded strip 4 defines a longitudinal cavity 10 in which a heat transfer fluid is circulated, and to be distributed in the beam 2 of tubes emerging in the cavity 10. It is noted that this cavity can be divided into several collection chambers and heat transfer fluid.
• the open end of the tubes 3 is intended to be force-fitted into the radial openings O of the manifold 4 (step S3) which are formed by the notches 8a, 8b arranged facing each other, once the strip 4 has been folded (FIG. 4A and 4C).
• the collector box 4 thus has, on a lateral edge and in the longitudinal direction, zones with openings O for the passage of a tube 3 and zones without tubes which close the cavity 10 by bringing into contact the beads arranged in to face.
• step S4 the sealing of the beads B between them and the tubes 3 on the manifold 4 is performed by brazing. Fixing beads B between them and tubes 3 on the manifold 4 can be performed in two separate steps.
• the distance separating two consecutive notches 8a, 8b is equal to the distance separating two consecutive tubes 3 from the beam 2.
• the shape of the notches 8a, 8b is complementary to the section of the tubes 3 so as to ensure a good sealing the tube assembly 3 and manifolds 41, 42.
• this thickness "e" of tube 3 is variable from one beam 2 to another.
• the lugs 9 formed in the notches 8a, 8b of the strip 5 extend into the cavity 10 at a distance from the O opening passage tube 3.
• the end of a tube 3 inserted into the opening O abuts against the lugs 9. It is thus possible to control the degree of penetration of the tube 3 in the cavity 10.
• Alternative embodiment of a collector box
• the free edges 7a, 7b of each portion 6a, 6b of the strip 5 are folded flat (step SI) twice, symmetrically with respect to the longitudinal axis X of the strip.
• the first fold is oriented towards the inside of the cavity 10, and the second fold towards the outside of the cavity 10.
• step S2 After folding in two steps of the band 5 (step S2), and as shown in FIG. 6B, the free edges 7a, 7b are thus oriented towards the outside of the cavity 10.
• the manifold 4 according to the second embodiment is adapted to be coupled to tubes 3 of greater thickness "e".
• each of the lateral portions of the notches comprises halfway between its bottom portion and the longitudinal edge of the groove. the band, a stop lug 9 protruding longitudinally.
• these lugs 9 extend into the cavity 10 at a distance from the opening O of passage of the tube 3.
• the end of a tube 3 inserted in the opening O abuts against the pins 9. It is thus possible to control the degree of penetration of the tube 3 in the cavity 10.
• heat exchange tubes are, for example, extruded and comprise a plurality of fluid circulation channels.
• manifold according to the invention may have one or more cavities, or chambers, coolant circulation.
• the strip of material to be folded can be obtained by assembling several plates.
• the beads can be reported on the tape.
• the heat exchanger may have one or two manifolds in accordance with the invention.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=58054372

Family Applications (1)

Country Status (4)

Family Cites Families (7)

• 2017
  • 2017-01-06 FR FR1750138A patent/FR3061767B1/fr not_active Expired - Fee Related
  • 2017-12-18 CN CN201780087760.2A patent/CN110366668B/zh not_active Expired - Fee Related
  • 2017-12-18 EP EP17829239.7A patent/EP3566015A1/fr not_active Withdrawn
  • 2017-12-18 WO PCT/FR2017/053656 patent/WO2018127642A1/fr unknown

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