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
  • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
  • F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
  • F28D1/0443—Combination of units extending one beside or one above the other
• • 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
  • F28D2021/0082—Charged air coolers
• • 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
  • F28D2021/0087—Fuel coolers

Definitions

• the invention relates to a heat exchanger of the multifunction, or even multifluid, type, very particularly suitable for motor vehicles.
• It relates more particularly to a heat exchanger comprising a single bundle of tubes and fins, divided into at least two parts suitable for being traversed by different fluids, which are intended to be cooled by a common cooling medium sweeping the bundle, and wherein the ends of the tubes are received in manifolds connected to manifolds.
• This known heat exchanger comprises a single bundle of tubes which is divided into two parts traversed respectively by two different fluids. Each of the parts of the bundle corresponds to an inlet manifold and an outlet manifold for the circulation of the fluid to be cooled.
• the two fluids are constituted respectively by a flow of supply air and by a flow of fuel which must be cooled by the same flow of air which scans the beam.
• This known heat exchanger can only operate in a safe manner in the case where the two fluids to be cooled have similar temperatures.
• This known heat exchanger cannot therefore be used when the two fluids to be cooled have very different temperatures, as is the case when one of the parts of the bundle constitutes a radiator for cooling a heat engine and another part of the bundle constitutes a cooling radiator, also called "cooler", of the engine charge air.
• the supercharging of a heat engine consists in supplying the latter with compressed air and not directly with atmospheric air, so as to increase the mass of oxygen available in the combustion chambers.
• the compression of the air is accompanied by a sharp rise in temperature, which can reach values of 150 ° C, or more.
• the object of the invention is in particular to overcome the aforementioned drawbacks.
• It aims in particular to provide a multifunctional heat exchanger capable of being traversed by different fluids, which can be at very different temperatures, and this without risk of damage to the bundle due to phenomena of differential expansion.
• It aims in particular to provide a heat exchanger of this type which can be used to ensure both the cooling of a motor vehicle engine and the cooling of the charge air of said engine.
• the invention provides a heat exchanger of the type defined in the introduction in which, at each end of the bundle, the ends of the tubes are connected to at least two separate collector plates, separated from each other by a tube. of the bundle, known as an "inactive tube", and in which the two manifold plates are respectively assembled to separate manifold boxes suitable for being traversed respectively by the fluids.
• the heat exchanger of the invention comprises a single bundle of tubes and fins, but this bundle is divided into two parts so that the ends of the tubes belonging respectively to the two parts are received in two separate manifold plates, and not in a single collector plate as in the prior art.
• the bundle is formed by an alternating stack of flat tubes and flakes produced in the form of corrugated spacers.
• the aforementioned flat tubes are advantageously of the multichannel type.
• the collector plates and the collector boxes can be assembled together, either mechanically with the interposition of a seal, or even by brazing.
• the invention applies very particularly to the case where the beam comprises two parts capable of being swept by the same flow of cooling air.
• this beam could comprise more than two parts, always swept by the same flow of cooling air.
• part of the bundle constitutes a radiator for cooling a heat engine
• another part of the bundle constitutes a radiator for cooling the charge air of said engine.
• the heat exchanger shown in the accompanying drawing comprises a single bundle 1 formed by an alternating stack of flat tubes 2 and fins 3 formed by corrugated spacers.
• the tubes 2 are so-called "two-channel" tubes obtained by bending and brazing a metal sheet, in particular based on aluminum.
• Each of the tubes internally defines two parallel channels 4 for the circulation of a fluid.
• the fins 3 are usually formed from the same metallic material and the latter are connected by brazing to the tubes 2.
• the tubes of the bundle are identical to each other and are divided into a first series of tubes 2a intended to be traversed by a first fluid F1 and into a second series of tubes 2b intended to be traversed by a second fluid F2.
• the first fluid F1 consists of the coolant (usually water with added antifreeze) from a heat engine, in particular from a motor vehicle.
• the second fluid F2 consists of supercharging air from said heat engine.
• the fins define between the tubes free spaces for the circulation of a flow of cooling air F3 which is common to all the tubes of the bundle.
• the bundle 10 comprises a particular tube 2i, called “inactive tube”, which separates the tubes 2a from the tubes 2b.
• This inactive tube 2i constitutes a thermal barrier which separates a first part P1 of the bundle consisting of the tubes 2a and the associated fins and a second part P2 of the bundle consisting of the tubes 2b and the associated fins.
• the fluid F1 and the fluid F2 can have very different temperatures, capable of generating stresses in the beam.
• the temperature of the fluid F1 can vary from the ambient value up to approximately 100 ° C.
• the fluid F2 charge air
• the fluid F1 and the fluid F2 can reach temperatures of the order of 150 ° C or more, which leads to differential expansion phenomena between the tubes 2a and the tubes 2b.
• the tubes 2a have ends 5a, also called “tube feet”, received in the openings of a collecting plate 6, also called “manifold”, which is assembled to a collecting box 7.
• the assembly constituted by the collecting plate 6 and the manifold 7 defines a volume serving as an inlet (or outlet) compartment for the fluid F1.
• the collector plate 6 has a peripheral edge 8 delimiting a gutter in which is received a peripheral rim 9 of the collector box 7, with the interposition of a seal 10.
• the edge 8 of the collector plate 6 is crenellated and folded against the rim 9 of the manifold 16 to form folded tabs 11.
• the tubes 2b have respective ends 5b received in openings of another collector plate 12 which is separate from the collector plate 6 and separated from the latter by the inactive tube 2i.
• the collector plate 12 is assembled to another collector box 13.
• the collector plate 12 comprises a peripheral edge 14 delimiting a peripheral gutter in which is received a peripheral rim 15 of the collector box 13 with interposition of a gasket sealing 16.
• the collecting plate 12 and the collecting box 13 jointly define a volume serving as an inlet (or outlet) compartment for the fluid F2.
• the assembly formed by the collecting plate 6 and the collecting box 7, on the one hand, and the assembly formed by the collecting plate 12 and the collecting box 13, on the other hand, are completely separate, although that they are connected to the same bundle of tubes.
• the invention makes it possible to get rid of these differential expansion phenomena while retaining the advantage of using a single bundle made up of all identical tubes. Since the exchanger includes different manifolds, it is possible to form the latter from different materials.
• the manifold 7 can be made of plastic and the manifold 13 of metallic material.
• the figure in the drawing shows only one end of the beam.
• the latter has an opposite end which is equipped with two other similar collecting plates and also with two other similar collecting boxes.
• the heat exchanger of the invention may have more than two parts so as to be traversed by more than two different fluids.
• at least two inactive tubes must be provided, separating at least three different series of tubes from the bundle.
• the invention is not limited to the particular case of a heat exchanger comprising a part forming a radiator for cooling a heat engine and another part forming a cooler for the charge air of this engine.

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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)

Applications Claiming Priority (2)

Publications (2)

Family

ID=9525444

Family Applications (1)

Country Status (3)

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Citations (6)

Family Cites Families (1)

• 1998
  • 1998-04-20 FR FR9804921A patent/FR2777643B1/fr not_active Expired - Fee Related
• 1999
  • 1999-04-19 EP EP19990107729 patent/EP0952418B1/de not_active Expired - Lifetime
  • 1999-04-19 DE DE1999608483 patent/DE69908483T2/de not_active Expired - Lifetime

Patent Citations (6)

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