Classifications

• • 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
  • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
  • F28F9/0224—Header boxes formed by sealing end plates into covers
• • 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
  • 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
• • 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
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
  • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
  • F28D2021/0084—Condensers

Definitions

• Slip box for heat exchanger particularly for a motor vehicle, and corresponding heat exchanger
• the invention relates to a manifold of a heat exchanger, in particular for a motor vehicle.
• Heat exchangers used in motor vehicles are already known, for example as condensers in an air conditioning circuit.
• Such a circuit generally comprises a compressor, a condenser or gas cooler, an expander and an evaporator.
• the condenser is arranged to condense and / or cool the first fluid by heat exchange with the second fluid.
• the first fluid used may be a refrigerant, such as a freon-based fluid, and the second fluid by a cooling fluid such as air.
• the heat exchanger comprises a bundle of heat exchange tubes, and a header.
• the manifold is made in one piece, for example by extrusion.
• collector boxes made in two parts, namely comprising a manifold for receiving the ends of the tubes and a cover which is fixed on the manifold to close the manifold ensuring sealing.
• the manifold has a generally round overall shape. This configuration allows good resistance to bursting.
• this configuration has a high height which adds to the size of the exchanger.
• the invention therefore aims to overcome these disadvantages of the prior art by providing an optimized collector for heat exchanger for good resistance to bursting while reducing the overall size of the collector and therefore the heat exchanger.
• the invention relates to a manifold for a heat exchanger, in particular for a motor vehicle, comprising a heat exchange bundle with a plurality of heat exchange tubes, said manifold comprising a flat-bottomed fluid collector for receiving the ends of said tubes, characterized in that said collector comprises two side walls extending from said flat bottom forming respectively a curvature between said side walls and said flat bottom of radius between 1.5 and 4 mm and in that said manifold has a ratio between the burst strength and the height of said manifold upper than 10.
• Said manifold may further comprise one or more of the following features, taken separately or in combination:
• said radius is of the order of 2 to 3 mm
• said collector has a generally "U" -shaped general shape
• said exchanger comprises a cover for closing said collector, of shape complementary to the shape of said collector,
• said collector has a height less than 15 mm
• said height is of the order of 11 mm
• said collector has a thickness of between 1 and 1.2 mm
• said collector has flanges for receiving the ends of said tubes.
• the invention also relates to a heat exchanger, in particular for a motor vehicle, comprising a heat exchange bundle with a plurality of heat exchange tubes, and at least one manifold as defined above.
• said exchanger is a condenser in particular for an air conditioning circuit in a motor vehicle.
• FIG. 1 represents a perspective view of a heat exchanger
• FIG. 2a is a sectional view of a manifold of the exchanger of FIG. 1 comprising a substantially U-shaped flat-bottomed collector,
• FIG. 2b is a sectional view of the manifold of the exchanger of FIG. 1 comprising a substantially U-shaped flat bottom collector receiving the ends of tubes of an exchange bundle of the heat exchanger;
• FIG. 3a is a graph showing schematically the evolution of the bursting behavior as a function of the radius of the flat-bottomed collector
• FIG. 3b is a graph showing schematically the evolution of the height of the flat-bottomed collector as a function of the radius of the flat-bottom collector, and
• FIG. 4 shows the evolution of the ratio between the burst strength and the height of the manifold as a function of the radius of the flat bottom collector.
• FIG. 1 is a simplified representation of a heat exchanger 1, such as a condenser of an air conditioning circuit, comprising a beam formed of a multiplicity of tubes 3, arranged in one or more rows of tubes 3.
• the exchanger 1 comprises in the illustrated example two fluid manifolds 5 so as to allow the admission of a fluid to circulate in the beam, then the evacuation of the fluid.
• Fluid inlet and outlet flanges 7 mounted in the example shown on a manifold 5 are provided for this purpose.
• a manifold 5 has a collector portion 9 flat bottom to receive the ends of the tubes 3; only one end of a tube 3 is visible in Figure 2b.
• the manifold 5 further includes a cover 11 to close the box 5.
• the collector 9 and the cover 11 are made in two distinct parts.
• the collector 9 has a material thickness of between 1 and 1.2 mm, for example of the order of 1.2 mm.
• the collector 9 has for example a width_1 of the order of 15 mm and a height h of the order of 11 mm.
• the manifold 5 thus has in this example a width _1 of the order of 15 mm and a height h of the order of 11 mm.
• Such a collector box 5 with a flat bottom collector 9 has a crushed shape with respect to a collector box with a round collector, and therefore has a height h less than the height of a collector box with round collector, which allows a gain of congestion.
• the collector 9 has as an example a generally "U" -shaped general shape with a central wall 13 and two lateral walls 15 which extend on either side of the central wall 13. The collector 9 delimits thus a cavity 17.
• the collector 9 has a flat bottom, namely according to this example that the central wall 13 of the "U" shape is substantially flat. This central wall 13 forms the flat bottom of the collector 9.
• This central wall 13 has a multiplicity of transverse slots (not visible in the figures) parallel to each other and whose shape is adapted to that of the tube ends 3 which pass through the collector 9.
• transverse slots are flanked by flanges 19 (FIG. 2b) to receive the ends of the tubes 3.
• the side walls 15 extend according to the illustrated example substantially perpendicular to the central wall 13.
• the collector 9 thus has a curvature 14 making the connection between the central wall 13 and the side wall 15.
• the collector 9 has a radius R ( Figure 2a) between 1.5 and 4 mm.
• the bursting strength is of the order of 90 bars
• the resistance to burst is of the order of 133 bars
• the bursting strength is of the order of 147 bars.
• each tube 3 inserted in an associated slot of the collector 9 has, on the one hand, a height of tube h1 between the end of the tube 3 inside the collector 9 and the lateral end of the associated slot, and secondly a tube height h2 inside the collector 9.
• This height h2 corresponds to the height of the tube between the end of the tube 3 inside the collector 9 and the inlet of the tube 3 in the associated slot.
• the reference for the second height h2 is for example substantially the middle of the slot.
• the height h 1 of tube 3 with respect to the lateral end of the slot is smaller than the height h 2 of tube 3 inside the collector 9.
• the first height hl is set to optimize the performance of the exchanger, especially for reasons of mechanical strength, or pressure drop.
• the height h1 with respect to the lateral end of the slot is thus determined and it is the height h2 of tube 3 inside the collector 9 which varies according to the shape of the collector 9.
• this height h2 is even smaller than the collector 9 is flat, that is to say that the radius R is small.
• the higher the lateral end of the slot the higher the tube portion that protrudes inside the collector 9 increases since the height hl of tube relative to this lateral end is fixed.
• the lateral end of the slot is all the higher as the radius R is large.
• the height h2 of the tube inside the collector 9 therefore increases with the radius R.
• the lower the lateral end of the slot the smaller the portion of tube that projects inside the manifold 9 decreases since the height h1 of tube relative to this lateral end is fixed.
• the lateral end of the slot is even lower than the radius R is small.
• the height h2 of the tube inside the collector 9 decreases with the radius R.
• the increase in the height of the manifold with the radius R is schematically represented by a linear line on the graph of FIG. 3b with the radius R in mm on the abscissa and the height h of the manifold 5 in the y-axis. mm.
• the radius R must not be too important not to generate overconsumption of tube material 3 and therefore an increase in the height of the collector 9, therefore the manifold 5 and therefore ⁇ total size of the exchanger 1 .
• the height h2 of the tube inside the collector 9 decreases the collector 9 is flat, and therefore decreases with the radius R.
• the height of the tube 3 for the heat exchange is fixed, the height h2 decreasing with the radius R, the total length of the tube 3 is decreased and we obtain a saving of material.
• This height h less than 15 mm and the radius R between 1.5 and 4 mm make it possible to reduce the overall size of the exchanger 1 compared to the solutions of the state of the art while ensuring a good resistance to wear. bursting.
• the optimized ratios or ratio lie for a radius R between 1.5 and 4 mm, and in particular for a radius R of the order of 2 to 4 mm.
• the ratio between the bursting strength and the height of the header is greater than 10.
• the Applicant has found an optimized solution for a radius R of the order of 2 to 3 mm with a height h of the manifold 5 of the order of 11 mm. Furthermore, with reference again to FIGS. 2a, 2b, the side walls 15 of the collector 9 have at their ends, crimping tabs 21 intended to be folded towards the inside of the cavity 17 so as to be supported on the outer face of the lid 11.
• the latter for example has substantially the same thickness as the collector 9, namely here a thickness of between 1 and 1.2 mm.
• the lid 11 has a shape complementary to the collector 9.
• the cover 11 also has a generally "U" -shaped general shape with a central wall 25 and two side walls
• the central wall 25 may be substantially flat similar to the flat bottom of the collector 9.
• the side walls 27 extend according to the illustrated example substantially perpendicular to the central wall 25.
• the cover may have a curvature 29 making the connection between the central wall 25 and a side wall 27.
• This curvature 29 is of complementary shape to the shape of the crimping tabs 21 of the collector 9 for the immobilization of the cover 29 inside the cavity 17.
• the distance between the outer faces of the side walls 27 of the cover 11 is substantially equal, in lower values, to the distance between the internal faces of the side walls 15 of the collector 9.
• external face is meant a face oriented towards the outside of the cavity 17.
• internal face is meant a face oriented towards the inside of the cavity 17.
• the distance that separates the external faces of the curvatures 29 of the cover 11 is substantially equal, in lower values, to the distance between the internal faces of the crimping lugs 21 of the collector 9.
• a collector with a flat bottom and having a radius R of the order of 1.5 to 4 mm at the curvature connecting the flat bottom of the collector 9 and the side walls 15 makes it possible to obtain a space saving and an optimized ratio between the burst strength and the height h of the manifold 5.

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

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• 2011
  • 2011-03-31 FR FR1152693A patent/FR2973492B1/fr active Active
• 2012
  • 2012-03-30 US US14/008,754 patent/US10222140B2/en active Active
  • 2012-03-30 WO PCT/EP2012/055807 patent/WO2012131046A1/fr active Application Filing
  • 2012-03-30 EP EP12711404.9A patent/EP2691725A1/fr not_active Withdrawn
  • 2012-03-30 CN CN201280025472.1A patent/CN103703337B/zh active Active
  • 2012-03-30 JP JP2014501657A patent/JP6060147B2/ja active Active

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