EP0501855B1 - Serpentine heat exchanger - Google Patents

Serpentine heat exchanger Download PDF

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Publication number
EP0501855B1
EP0501855B1 EP92400450A EP92400450A EP0501855B1 EP 0501855 B1 EP0501855 B1 EP 0501855B1 EP 92400450 A EP92400450 A EP 92400450A EP 92400450 A EP92400450 A EP 92400450A EP 0501855 B1 EP0501855 B1 EP 0501855B1
Authority
EP
European Patent Office
Prior art keywords
end plate
heat exchanger
connecting block
flanges
exchanger according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92400450A
Other languages
German (de)
French (fr)
Other versions
EP0501855A1 (en
Inventor
Michel Potier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Thermique Moteur SA
Original Assignee
Valeo Thermique Moteur SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP0501855A1 publication Critical patent/EP0501855A1/en
Application granted granted Critical
Publication of EP0501855B1 publication Critical patent/EP0501855B1/en
Anticipated expiration legal-status Critical
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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
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • 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
    • F28D1/047—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 bent, e.g. in a serpentine or zig-zag
    • F28D1/0475—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 bent, e.g. in a serpentine or zig-zag the conduits having a single U-bend
    • 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
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F28F9/0251—Massive connectors, e.g. blocks; Plate-like connectors
    • 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
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F28F9/0256—Arrangements for coupling connectors with flow lines

Definitions

  • the invention relates to a heat exchanger, of the coil type, suitable for being part of an air conditioning installation of a motor vehicle, with an inlet or outlet pipe forming part of a circulation circuit of a Refrigerant.
  • the coil type heat exchangers usually comprise a bundle of hairpin tubes, also called U-tubes, which are interconnected by crosses and which pass through a multiplicity of parallel fins.
  • the fin assembly is provided with at least one end plate which is also crossed by the hairpin tubes.
  • the end plate is generally constituted by a core which extends parallel to the fins and which comprises two fallen edges directed either on the side of the fins, or on the opposite side.
  • This end plate is essentially used for holding the heat exchanger and / or for attaching accessories, for example for attaching a support leg for the tubing.
  • brackets are brazed by ultrasound or else crimped onto the ends of the pin tubes.
  • Most heat exchangers include two coils, the tubing then being connected to the respective ends of two bundle tubes.
  • the tubing is then composed of three parts previously assembled by brazing, namely a threaded connection, an intermediate tube and two secondary tubes connected respectively to the two tubes of the bundle.
  • the connection of the two secondary tubes to the two tubes of the the heat exchanger bundle is produced either by brazing or by means of special clamping rings.
  • At least one of the pin tubes has one end which protrudes from the end plate and which is suitable for being connected to the circulation pipe of fluid by a connecting member to the fluid circulation pipe and providing a receiving housing for the sealed fitting of the or each end of the tube to be connected.
  • the invention particularly aims to remedy the aforementioned drawbacks.
  • the exchanger comprises a connection block provided with the connecting member as well as fixing means for securing the connection block on the plate end of the heat exchanger.
  • connection device which is much simpler in structure than the prior devices, since it simply comprises a block which is fitted onto the or each end of the tubes to be connected, which is provided with a connecting member to the tubing and which is attached to the end plate of the heat exchanger.
  • connecting member to the tubing can adopt any orientation desired, depending on each particular use.
  • the invention applies very particularly to a heat exchanger defined above, in which the end plate comprises a core extending parallel to the fins and provided with two fallen edges extending perpendicular to the core.
  • the aforementioned fixing means comprise screws, rivets or the like passing through the fallen edges of the end plate.
  • the two fallen edges of the end plate are turned on the side opposite to the fins of the heat exchanger, the two fallen edges form, with the core, a receiving housing for the connection block, this the latter comprising two opposite parallel faces suitable for being maintained between the two fallen edges of the end plate.
  • connection block comprises two spaced apart edges suitable for covering the two fallen edges respectively. the end plate.
  • the invention can also be applied to a heat exchanger in which the end plate is, as taught by French Patent No. 2,509,031, a clamping plate provided with holes suitable for crimping the hooks on the hairpin tubes.
  • the plate then comprises a receiving housing for the connection block.
  • this plate is molded, for example from plastic, and the receiving housing is molded with the plate.
  • This receiving housing is advantageously delimited by a cylindrical wall which depends on the plate and which is provided with an external thread, the means for fixing the connection block comprising a retaining nut suitable for being screwed onto the wall thread and having an orifice for passage of the tubing.
  • connection block comprises a housing for fitting the tubing and the retaining nut comprises an annular shoulder surrounding the passage orifice and suitable for bearing on a bead of the tubing .
  • the retaining nut is used on the one hand for holding the connection block in its housing and, on the other hand, for fitting the tubing onto this connection block.
  • the housing for receiving the connection block comprises at least one recess suitable for receiving the end of a tube to be connected, with the interposition of an annular seal.
  • the invention in another aspect, relates to a coil heat exchanger, provided with at least one connection device as defined above.
  • FIG. 1 shows a heat exchanger 10, of the coil type, comprising a bundle of hairpin tubes 12, also called U-shaped tubes, interconnected by brackets 14 of generally semi shape -circular.
  • Each pin tube 12 is produced in one piece from a tube section of circular section which is appropriately bent to form two rectilinear parts 16, parallel to each other, connected by a semi-circular part 18.
  • Each of the rectilinear parts 16 ends in an end 20 of flared shape.
  • Each of the hooks 14 is fitted and brazed, for example by ultrasound, into the respective ends 20 of two adjacent tubes 12.
  • the straight parts 16 of the tubes 12 pass through a multiplicity of fins 22 which extend parallel to each other and perpendicular to the direction of the straight parts 16.
  • the set of fins 22 is completed, at at least one of its ends, by an end plate 24 comprising a core 26 which extends parallel to the fins 22 and which is crossed by the rectilinear parts 16 of the tubes 12 .
  • the core 26 is extended by two fallen edges 28 which extend perpendicular to the core 26 and which are turned towards the side of the fins 22.
  • the core 24 further comprises two other fallen edges 30, of shorter length than the edges 28, located on the left side of the heat exchanger 10 in FIG. 1.
  • the edges 30 are turned on the side opposite to the fins 22 to serve as receptacle for a connection block 32 (FIGS. 1 to 4) which will be described in detail later.
  • the heat exchanger 10 comprises a first ply of tubes 12 whose rectilinear parts 16 are located in the same plane and connected in pairs by brackets 14, which makes it possible to define a first coil.
  • the heat exchanger 10 further comprises a second ply formed of pinned tubes 12 ′ (FIG. 3) whose rectilinear portions are located in the same plane and linked together in pairs by brackets to form a second coil.
  • the two tubes 12 and 12 ′ situated on the left side of the exchanger 10 have free flared ends, respectively 34 and 34 ′ (FIG. 3), which protrude from the end plate 24, in the region between the two fallen edges 30 located opposite.
  • the two ends 34 and 34 ′ are intended to be connected to a pipe 36 for circulating fluid.
  • the heat exchanger 10 is a condenser intended to form part of an air conditioning installation of a motor vehicle, the pipe 36 serving for the admission or the evacuation of a refrigerant simultaneously in the two coils of the heat exchanger.
  • the block 32 of generally parallelepipedal shape, is limited by a lower face 38 capable of bearing on the core 26 of the plate 24, an opposite upper face 40 two opposite lateral faces 42 capable of coming to bear against the two fallen edges 30, and two other opposite side faces 44 ( Figures 2 to 4).
  • connection block 32 comprises a connecting member 46 which is formed in one piece with the block.
  • the connecting member 46 is constituted by a nozzle provided with an external thread 48 suitable for receiving a retaining nut 50 (FIG. 1) to allow the connection of the tubing 36 with the block 32.
  • a connection with the tubing by clipping means can be envisaged, such as a connection with the tubing by clipping means.
  • the threaded end piece 46 extends along an axis XX which, in the example, is parallel to that of the tubes 12 and 12 ′. However, it is possible to give the axis XX any desired orientation, depending on the installation conditions desired for the heat exchanger 10.
  • the end piece 46 has a axial passage 52 of stepped shape which communicates with two cylindrical housings 54 and 54 ′ of parallel axes which both open into the underside 38 of the connection block 32 and which are adapted to receive respectively the ends 34 and 34 ′ of the tubes 12 and 12 ′ ( Figure 3).
  • the housings 54 and 54 ′ are formed by cylindrical bores opening onto the face 38 by means of a cylindrical part 56, respectively 56 ′, of larger diameter, suitable for receiving an O-ring seal 58, respectively 58 ′, On a recess 60 extending parallel to the face 38 to receive a plate 62.
  • This plate is provided with two orifices for the passage of the tubes 12 and 12 ′ and it is intended to ensure the compression of the O-rings 58 and 58 ′.
  • connection block 32 is fixed to the end plate 24 by two rivets 64 which pass through the two fallen edges 30 as well as the thickness of the connection block 32.
  • the latter can be made of metal, for example aluminum, or also made of plastic, for example polyamide.
  • the end plate 24 could have two fallen edges, both turned on the side opposite the fins.
  • FIGS 5 and 6 show a heat exchanger equipped with a connection device similar to that of Figures 1 to 4.
  • the heat exchanger 10 is provided with a end plate 24 whose two fallen edges 28 are, over their entire length, turned towards the side of the fins 22.
  • the connection block 32 includes two spaced apart flanges 66 located in the extension of the external faces 42 of the block.
  • the flanges 66 extend beyond the underside 38 of the block and these two edges provide between them a space whose width corresponds to that of the end plate 24.
  • the flanges 66 are adapted to come to cap respectively the two fallen edges 28 of the plate 24.
  • the block 32 is provided with a threaded end piece 46 providing an internal passage 52 opening into two cylindrical bores 54 and 54 ′.
  • the latter are suitable for receiving the ends 34 and 34 ′ of the tubes 12 and 12 ′, with the interposition of O-ring seals 58 and 58 ′.
  • the compression of the seals 58 and 58 ′ is carried out directly by the core 26 of the end plate 24.
  • the connection block 32 is held on the heat exchanger by means of two rivets 68 which cross the edges 66 and the fallen edges 28.
  • FIGS. 7 and 9 relate to another variant embodiment of the invention.
  • the ends of the pin tubes 12 are fitted and crimped on the brackets 14, instead of being brazed as in the previous embodiments.
  • the crimping of the ends of the tubes on the hooks is carried out simultaneously by means of a clamping plate 70 which at the same time constitutes an end plate of the heat exchanger as taught by French patent n ° 82 11470 cited above.
  • the plate 70 is produced by molding, for example of a plastic material, and comprises a very thick core 72 which extends parallel to the fins 22. This core comprises a multiplicity of holes arranged in the same geometrical configuration as the ends of the beam tubes.
  • the plate After insertion of the ends of the bundle tubes into the corresponding holes of the plate, and after introduction of the hooks, the plate is moved in a direction parallel to that of the tubes to allow the simultaneous crimping of the ends of the tubes of the bundle into the ends of the corresponding hooks.
  • the plate 70 is modified so as to allow the mounting of a one-piece connection device.
  • the core 72 of the plate 70 is provided, at one of its ends, with a cylindrical wall 74 turned on the side opposite to the fins 22 and provided with an external thread 76 to allow the screwing of a retaining nut 78.
  • the wall 74 delimits internally, in combination with the core 72, a cylindrical housing 80 into which open the ends 34 and 34 ′ of the tubes 12 and 12 ′ to be connected.
  • the cylindrical housing 80 receives a connection block 82 delimited by a cylindrical wall 84 whose diameter is slightly less than the diameter of the cylindrical housing 80.
  • the block 82 is further limited by a lower circular face 86 and an upper circular face 88.
  • the block 82 comprises an axial housing 90 constituted by a stepped cylindrical bore which opens, on the one hand, into the upper face 88 of the block and, on the other hand, into two spaced cylindrical bores 92 and 92 ′ opening into the lower face 86 of the block.
  • the bores 92 and 92 ′ form housings to receive the respective ends 34 and 34 ′ of the tubes 12 and 12 ′ to be connected.
  • the seal between the block 82 and the ends 34 and 34 ′ is ensured by annular seals 58 and 58 ′, as in the case of the preceding embodiments.
  • the connection tube 36 is provided, near its end 94, with an external bead 96. This bead is able to bear against a shoulder 98 of the housing 90, an annular seal 100 being interposed between the end 94 of the tubing 36 and the internal wall of the housing 90.
  • the clamping nut 78 is provided with a passage orifice 102 and further comprises an annular shoulder 104 which surrounds this passage orifice and which is capable of bearing on the bead 92 of the tubing.
  • the invention applies to any type of coil heat exchanger, in particular to condensers, but also to evaporators.

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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)

Description

L'invention concerne un échangeur de chaleur, du type à serpentin, propre à faire partie d'une installation de climatisation d'un véhicule automobile, à une tubulure d'entrée ou de sortie faisant partie d'un circuit de circulation d'un fluide frigorigène.The invention relates to a heat exchanger, of the coil type, suitable for being part of an air conditioning installation of a motor vehicle, with an inlet or outlet pipe forming part of a circulation circuit of a Refrigerant.

Comme cela est décrit dans le document FR-A-2 398 956, les échangeurs de chaleur du type à serpentin comprennent habituellement un faisceau de tubes en épingle, encore appelés tubes en U, qui sont reliés entre eux par des crosses et qui traversent une multiplicité d'ailettes parallèles. L'ensemble d'ailettes est muni d'au moins une plaque d'extrémité qui est également traversée par les tubes en épingle.As described in document FR-A-2 398 956, the coil type heat exchangers usually comprise a bundle of hairpin tubes, also called U-tubes, which are interconnected by crosses and which pass through a multiplicity of parallel fins. The fin assembly is provided with at least one end plate which is also crossed by the hairpin tubes.

La plaque d'extrémité est généralement constituée par une âme qui s'étend parallèlement aux ailettes et qui comprend deux bords tombés dirigés soit du côté des ailettes, soit du côté opposé. Cette plaque d'extrémité sert essentiellement au maintien de l'échangeur de chaleur et/ou à la fixation d'accessoires, par exemple à la fixation d'une patte de support de la tubulure.The end plate is generally constituted by a core which extends parallel to the fins and which comprises two fallen edges directed either on the side of the fins, or on the opposite side. This end plate is essentially used for holding the heat exchanger and / or for attaching accessories, for example for attaching a support leg for the tubing.

Dans les échangeurs de chaleur connus de ce type, les crosses sont brasées par ultrasons ou bien serties sur les extrémités des tubes en épingle.In known heat exchangers of this type, the brackets are brazed by ultrasound or else crimped onto the ends of the pin tubes.

La plupart des échangeurs de chaleur comprennent deux serpentins, la tubulure étant alors reliée aux extrémités respectives de deux tubes du faisceau. La tubulure est alors composée de trois parties préalablement assemblées par brasage, à savoir un raccord fileté, un tube intermédiaire et deux tubes secondaires reliés respectivement aux deux tubes du faisceau. Le raccordement des deux tubes secondaires aux deux tubes du faisceau de l'échangeur est réalisé soit par brasage, soit au moyen de bagues de serrage particulières.Most heat exchangers include two coils, the tubing then being connected to the respective ends of two bundle tubes. The tubing is then composed of three parts previously assembled by brazing, namely a threaded connection, an intermediate tube and two secondary tubes connected respectively to the two tubes of the bundle. The connection of the two secondary tubes to the two tubes of the the heat exchanger bundle is produced either by brazing or by means of special clamping rings.

Dans les échangeurs de chaleur du type décrit dans FR-A-2 398 956, l'un au moins des tubes en épingle comporte une extrémité qui dépasse de la plaque d'extrémité et qui est propre à être raccordée à la tubulure de circulation de fluide par un organe de liaison à la tubulure de circulation de fluide et ménageant un logement de réception pour l'emboîtement étanche de la ou chaque extrémité du tube à raccord.In heat exchangers of the type described in FR-A-2 398 956, at least one of the pin tubes has one end which protrudes from the end plate and which is suitable for being connected to the circulation pipe of fluid by a connecting member to the fluid circulation pipe and providing a receiving housing for the sealed fitting of the or each end of the tube to be connected.

Un tel raccordement est complexe à réaliser, même dans le cas où la tubulure ne se raccorde qu'à un seul tube du faisceau. De plus, le départ de la tubulure ne peut se faire que dans l'axe des tubes du faisceau.Such a connection is complex to carry out, even in the case where the tubing is connected to only one tube of the bundle. In addition, the departure of the tubing can only be done in the axis of the tubes of the bundle.

L'invention a notamment pour bout de remédier aux inconvénients précités.The invention particularly aims to remedy the aforementioned drawbacks.

Elle propose, à cet effet, un échangeur de chaleur à serpentin selon la revendication 1. L'échangeur comprend un bloc de raccordement muni de l'organe de liaison ainsi que des moyens de fixation pour solidariser le bloc de raccordement sur la plaque d'extrémité de l'échangeur de chaleur.It proposes, for this purpose, a coil heat exchanger according to claim 1. The exchanger comprises a connection block provided with the connecting member as well as fixing means for securing the connection block on the plate end of the heat exchanger.

On obtient ainsi un dispositif de raccordement de structure beaucoup plus simple que les dispositifs antérieurs, puisqu'il comprend simplement un bloc qui est emboîté sur la ou chaque extrémité de tubes à raccorder, qui est muni d'un organe de liaison à la tubulure et qui est fixé sur la plaque d'extrémité de l'échangeur de chaleur.A connection device is thus obtained which is much simpler in structure than the prior devices, since it simply comprises a block which is fitted onto the or each end of the tubes to be connected, which is provided with a connecting member to the tubing and which is attached to the end plate of the heat exchanger.

En outre, l'organe de liaison à la tubulure peut adopter toute orientation voulue, en fonction de chaque utilisation particulière.In addition, the connecting member to the tubing can adopt any orientation desired, depending on each particular use.

L'invention s'applique tout particulièrement à un échangeur de chaleur défini précédemment, dans lequel la plaque d'extrémité comprend une âme s'étendant parallèlement aux ailettes et munie de deux bords tombés s'étendant perpendiculairement à l'âme.The invention applies very particularly to a heat exchanger defined above, in which the end plate comprises a core extending parallel to the fins and provided with two fallen edges extending perpendicular to the core.

Selon l'invention, les moyens de fixation précités comportent des vis, rivets ou analogues traversant les bords tombés de la plaque d'extrémité.According to the invention, the aforementioned fixing means comprise screws, rivets or the like passing through the fallen edges of the end plate.

Dans le cas où les deux bords tombés de la plaque d'extrémité sont tournés du côté opposé aux ailettes de l'échangeur de chaleur, les deux bords tombés forment, avec l'âme, un logement de réception pour le bloc de raccordement, ce dernier comportant deux faces parallèles opposées propres à être maintenues entre les deux bords tombés de la plaque d'extrémité.In the case where the two fallen edges of the end plate are turned on the side opposite to the fins of the heat exchanger, the two fallen edges form, with the core, a receiving housing for the connection block, this the latter comprising two opposite parallel faces suitable for being maintained between the two fallen edges of the end plate.

Dans le cas où les deux bords tombés de la plaque d'extrémité sont tournés du côté des ailettes de l'échangeur de chaleur, l'invention prévoit que le bloc de raccordement comprend deux rebords espacés propres à venir coiffer respectivement les deux bords tombés de la plaque d'extrémité.In the case where the two fallen edges of the end plate are turned towards the side of the fins of the heat exchanger, the invention provides that the connection block comprises two spaced apart edges suitable for covering the two fallen edges respectively. the end plate.

L'invention peut s'appliquer également à un échangeur de chaleur dans lequel la plaque d'extrémité est, comme enseigné par le brevet français n° 2 509 031, une plaque de serrage munie de trous propres à assurer le sertissage des crosses sur les tubes en épingle.The invention can also be applied to a heat exchanger in which the end plate is, as taught by French Patent No. 2,509,031, a clamping plate provided with holes suitable for crimping the hooks on the hairpin tubes.

Selon l'invention, la plaque comporte alors un logement de réception pour le bloc de raccordement.According to the invention, the plate then comprises a receiving housing for the connection block.

Avantageusement, cette plaque est moulée, par exemple en matière plastique, et le logement de réception est venu de moulage avec la plaque.Advantageously, this plate is molded, for example from plastic, and the receiving housing is molded with the plate.

Ce logement de réception est avantageusement délimité par une paroi cylindrique qui dépend de la plaque et qui est muni d'un filetage extérieur, les moyens de fixation du bloc de raccordement comprenant un écrou de retenue propre à être vissé sur le filetage de la paroi et comportant un orifice de passage de la tubulure.This receiving housing is advantageously delimited by a cylindrical wall which depends on the plate and which is provided with an external thread, the means for fixing the connection block comprising a retaining nut suitable for being screwed onto the wall thread and having an orifice for passage of the tubing.

Selon une autre caractéristique de l'invention, le bloc de raccordement comporte un logement pour l'emboîtement de la tubulure et l'écrou de retenue comporte un épaulement annulaire entourant l'orifice de passage et propre à prendre appui sur un bourrelet de la tubulure.According to another characteristic of the invention, the connection block comprises a housing for fitting the tubing and the retaining nut comprises an annular shoulder surrounding the passage orifice and suitable for bearing on a bead of the tubing .

L'écrou de retenue sert d'une part au maintien du bloc de raccordement dans son logement et, d'autre part, à l'emboîtement de la tubulure sur ce bloc de raccordement.The retaining nut is used on the one hand for holding the connection block in its housing and, on the other hand, for fitting the tubing onto this connection block.

Avantageusement, le logement de réception du bloc de raccordement comporte au moins un évidement propre à recevoir l'extrémité d'un tube à raccorder, avec interposition d'un joint annulaire d'étanchéité.Advantageously, the housing for receiving the connection block comprises at least one recess suitable for receiving the end of a tube to be connected, with the interposition of an annular seal.

Sous un autre aspect, l'invention concerne un échangeur de chaleur à serpentin, muni d'au moins un dispositif de raccordement tel que défini précédemment.In another aspect, the invention relates to a coil heat exchanger, provided with at least one connection device as defined above.

Dans la description qui suit, donnée seulement à titre d'exemple, on se réfère aux dessins annexés, sur lesquels :

  • la figure 1 est une vue partielle, en élévation, d'un échangeur de chaleur à serpentin muni d'un dispositif de raccordement selon l'invention ;
  • la figure 2 est une vue partielle de dessus de l'échangeur de chaleur de la figure 1, la tubulure de raccordement étant enlevée ;
  • la figure 3 est une vue en coupe suivant la ligne III-III de la figure 2 ;
  • la figure 4 est une vue en coupe suivant la ligne IV-IV de la figure 3 ;
  • la figure 5 est une vue en coupe, analogue à celle de la figure 3, dans une seconde forme de réalisation de l'invention ;
  • la figure 6 est une vue en coupe suivant la ligne VI-VI de la figure 5 ;
  • la figure 7 est une vue de dessus, analogue à celle de la figure 2, dans une troisième forme de réalisation de l'invention ;
  • la figure 8 est une vue en coupe suivant la ligne VIII-VIII de la figure 7 ; et
  • la figure 9 est une vue en coupe suivant la ligne IX-IX de la figure 7.
In the description which follows, given only by way of example, reference is made to the appended drawings, in which:
  • Figure 1 is a partial view, in elevation, of a coil heat exchanger provided with a connection device according to the invention;
  • Figure 2 is a partial top view of the heat exchanger of Figure 1, the connecting pipe being removed;
  • Figure 3 is a sectional view along line III-III of Figure 2;
  • Figure 4 is a sectional view along line IV-IV of Figure 3;
  • Figure 5 is a sectional view, similar to that of Figure 3, in a second embodiment of the invention;
  • Figure 6 is a sectional view along line VI-VI of Figure 5;
  • Figure 7 is a top view, similar to that of Figure 2, in a third embodiment of the invention;
  • Figure 8 is a sectional view along line VIII-VIII of Figure 7; and
  • FIG. 9 is a sectional view along line IX-IX of FIG. 7.

On se réfère tout d'abord à la figure 1 qui montre un échangeur de chaleur 10, du type à serpentin, comportant un faisceau de tubes en épingle 12, encore appelés tubes en U, reliés entre eux par des crosses 14 de forme générale semi-circulaire. Chaque tube en épingle 12 est réalisé d'une seule pièce à partir d'un tronçon de tube de section circulaire qui est cintré, de manière appropriée, pour former deux parties rectilignes 16, parallèles entre elles, reliées par une partie semi-circulaire 18. Chacune des parties rectilignes 16 se termine par une extrémité 20 de forme évasée. Chacune des crosses 14 est emmanchée et brasée, par exemple aux ultrasons, dans les extrémités respectives 20 de deux tubes 12 adjacents.First of all, reference is made to FIG. 1 which shows a heat exchanger 10, of the coil type, comprising a bundle of hairpin tubes 12, also called U-shaped tubes, interconnected by brackets 14 of generally semi shape -circular. Each pin tube 12 is produced in one piece from a tube section of circular section which is appropriately bent to form two rectilinear parts 16, parallel to each other, connected by a semi-circular part 18. Each of the rectilinear parts 16 ends in an end 20 of flared shape. Each of the hooks 14 is fitted and brazed, for example by ultrasound, into the respective ends 20 of two adjacent tubes 12.

Les parties rectilignes 16 des tubes 12 traversent une multiplicité d'ailettes 22 qui s'étendent parallèlement entre elles et perpendiculairement à la direction des parties rectilignes 16.The straight parts 16 of the tubes 12 pass through a multiplicity of fins 22 which extend parallel to each other and perpendicular to the direction of the straight parts 16.

L'ensemble des ailettes 22 est complété, à l'une au moins de ses extrémités, par une plaque d'extrémité 24 comportant une âme 26 qui s'étend parallèlement aux ailettes 22 et qui est traversée par les parties rectilignes 16 des tubes 12.The set of fins 22 is completed, at at least one of its ends, by an end plate 24 comprising a core 26 which extends parallel to the fins 22 and which is crossed by the rectilinear parts 16 of the tubes 12 .

L'âme 26 se prolonge par deux bords tombés 28 qui s'étendent perpendiculairement à l'âme 26 et qui sont tournés du côté des ailettes 22. L'âme 24 comporte en outre deux autres bords tombés 30, de plus faible longueur que les bords 28, situés du côté gauche de l'échangeur de chaleur 10 sur la figure 1. Les bords 30 sont tournés du côté opposé aux ailettes 22 pour servir de réceptacle à un bloc de raccordement 32 (figures 1 à 4) qui sera décrit en détail plus loin.The core 26 is extended by two fallen edges 28 which extend perpendicular to the core 26 and which are turned towards the side of the fins 22. The core 24 further comprises two other fallen edges 30, of shorter length than the edges 28, located on the left side of the heat exchanger 10 in FIG. 1. The edges 30 are turned on the side opposite to the fins 22 to serve as receptacle for a connection block 32 (FIGS. 1 to 4) which will be described in detail later.

Dans l'exemple, l'échangeur de chaleur 10 comprend une première nappe de tubes 12 dont les parties rectilignes 16 sont situées dans un même plan et reliées deux à deux par des crosses 14, ce qui permet de définir un premier serpentin. L'échangeur de chaleur 10 comprend en outre une deuxième nappe formée de tubes en épingle 12′ (figure 3) dont les portions rectilignes sont situées dans un même plan et reliées entre elles deux à deux par des crosses pour former un second serpentin.In the example, the heat exchanger 10 comprises a first ply of tubes 12 whose rectilinear parts 16 are located in the same plane and connected in pairs by brackets 14, which makes it possible to define a first coil. The heat exchanger 10 further comprises a second ply formed of pinned tubes 12 ′ (FIG. 3) whose rectilinear portions are located in the same plane and linked together in pairs by brackets to form a second coil.

Les deux tubes 12 et 12′ situés du côté gauche de l'échangeur 10 (figure 1) possèdent des extrémités libres non évasées, respectivement 34 et 34′ (figure 3), qui dépassent de la plaque d'extrémité 24, dans la région comprise entre les deux bords tombés 30 situés en vis-à-vis. Les deux extrémités 34 et 34′ sont destinées à être raccordées à une tubulure 36 de circulation de fluide.The two tubes 12 and 12 ′ situated on the left side of the exchanger 10 (FIG. 1) have free flared ends, respectively 34 and 34 ′ (FIG. 3), which protrude from the end plate 24, in the region between the two fallen edges 30 located opposite. The two ends 34 and 34 ′ are intended to be connected to a pipe 36 for circulating fluid.

Dans une application préférentielle de l'invention, l'échangeur de chaleur 10 est un condenseur destiné à faire partie d'une installation de climatisation d'un véhicule automobile, la tubulure 36 servant à l'admission ou à l'évacuation d'un fluide frigorigène simultanément dans les deux serpentins de l'échangeur de chaleur.In a preferred application of the invention, the heat exchanger 10 is a condenser intended to form part of an air conditioning installation of a motor vehicle, the pipe 36 serving for the admission or the evacuation of a refrigerant simultaneously in the two coils of the heat exchanger.

Le bloc 32, de forme générale parallèlépipèdique, est limité par une face inférieure 38 propre à prendre appui sur l'âme 26 de la plaque 24, une face supérieure opposée 40 deux faces latérales opposées 42 propres à venir en appui contre les deux bords tombés 30, et deux autres faces latérales opposées 44 (figures 2 à 4).The block 32, of generally parallelepipedal shape, is limited by a lower face 38 capable of bearing on the core 26 of the plate 24, an opposite upper face 40 two opposite lateral faces 42 capable of coming to bear against the two fallen edges 30, and two other opposite side faces 44 (Figures 2 to 4).

Le bloc de raccordement 32 comporte un organe de liaison 46 qui est formé d'une seule pièce avec le bloc. Dans l'exemple, l'organe de liaison 46 est constitué par un embout muni d'un filetage externe 48 propre à recevoir un écrou de retenue 50 (figure 1) pour permettre le raccordement de la tubulure 36 avec le bloc 32. Mais tout autre moyen peut être envisagé, tel qu'un raccordement avec la tubulure par des moyens de clipage.The connection block 32 comprises a connecting member 46 which is formed in one piece with the block. In the example, the connecting member 46 is constituted by a nozzle provided with an external thread 48 suitable for receiving a retaining nut 50 (FIG. 1) to allow the connection of the tubing 36 with the block 32. But all other means can be envisaged, such as a connection with the tubing by clipping means.

L'embout fileté 46 s'étend suivant un axe XX qui, dans l'exemple, est parallèle à celui des tubes 12 et 12′. Toutefois, il est possible de donner à l'axe XX toute orientation voulue, en fonction des conditions d'implantation souhaitées pour l'échangeur de chaleur 10. L'embout 46 comporte un passage axial 52 de forme étagée qui communique avec deux logements cylindriques 54 et 54′ d'axes parallèles qui débouchent tous deux dans la face inférieure 38 du bloc de raccordement 32 et qui sont propres à recevoir respectivement les extrémités 34 et 34′ des tubes 12 et 12′ (figure 3).The threaded end piece 46 extends along an axis XX which, in the example, is parallel to that of the tubes 12 and 12 ′. However, it is possible to give the axis XX any desired orientation, depending on the installation conditions desired for the heat exchanger 10. The end piece 46 has a axial passage 52 of stepped shape which communicates with two cylindrical housings 54 and 54 ′ of parallel axes which both open into the underside 38 of the connection block 32 and which are adapted to receive respectively the ends 34 and 34 ′ of the tubes 12 and 12 ′ (Figure 3).

Les logements 54 et 54′ sont formés par des alésages cylindriques débouchant sur la face 38 par l'intermédiaire d'une partie cylindrique 56, respectivement 56′, de plus grand diamètre, propre à recevoir un joint torique d'étanchéité 58, respectivement 58′, sur un évidement 60 s'étendant parallèlement à la face 38 pour recevoir une plaque 62. Cette plaque est munie de deux orifices pour le passage des tubes 12 et 12′ et elle est destinée à assurer la compression des joints toriques 58 et 58′.The housings 54 and 54 ′ are formed by cylindrical bores opening onto the face 38 by means of a cylindrical part 56, respectively 56 ′, of larger diameter, suitable for receiving an O-ring seal 58, respectively 58 ′, On a recess 60 extending parallel to the face 38 to receive a plate 62. This plate is provided with two orifices for the passage of the tubes 12 and 12 ′ and it is intended to ensure the compression of the O-rings 58 and 58 ′.

Le bloc de raccordement 32 est fixé sur la plaque d'extrémité 24 par deux rivets 64 qui traversent les deux bords tombés 30 ainsi que l'épaisseur du bloc de raccordement 32. Ce dernier peut être réalisé en métal, par exemple en aluminium, ou encore en matière plastique, par exemple en polyamide.The connection block 32 is fixed to the end plate 24 by two rivets 64 which pass through the two fallen edges 30 as well as the thickness of the connection block 32. The latter can be made of metal, for example aluminum, or also made of plastic, for example polyamide.

Dans la forme de réalisation représentée aux figures 1 à 4, la plaque d'extrémité 24 pourrait comporter deux bords tombés tournés tous deux du côté opposé aux ailettes.In the embodiment shown in Figures 1 to 4, the end plate 24 could have two fallen edges, both turned on the side opposite the fins.

On se réfère maintenant aux figures 5 et 6 qui montrent un échangeur de chaleur équipé d'un dispositif de raccordement s'apparentant à celui des figures 1 à 4. Dans cette forme de réalisation, l'échangeur de chaleur 10 est muni d'une plaque d'extrémité 24 dont les deux bords tombés 28 sont, sur toute leur longueur, tournées du côté des ailettes 22.Referring now to Figures 5 and 6 which show a heat exchanger equipped with a connection device similar to that of Figures 1 to 4. In this embodiment, the heat exchanger 10 is provided with a end plate 24 whose two fallen edges 28 are, over their entire length, turned towards the side of the fins 22.

Le bloc de raccordement 32 comprend deux rebords espacés 66 situés dans le prolongement des faces externes 42 du bloc. Les rebords 66 s'étendent au-delà de la face inférieure 38 du bloc et ces deux bords ménagent entre eux un espace dont la largeur correspond à celle de la plaque d'extrémité 24. Les rebords 66 sont propres à venir coiffer respectivement les deux bords tombés 28 de la plaque 24. Comme dans le cas des figures 1 à 4, le bloc 32 est muni d'un embout fileté 46 ménageant un passage interne 52 débouchant dans deux alésages cylindriques 54 et 54′. Ces derniers sont propres à recevoir les extrémités 34 et 34′ des tubes 12 et 12′, avec interposition de joints toriques d'étanchéité 58 et 58′. Toutefois, dans la forme de réalisation des figures 5 et 6, la compression des joints 58 et 58′ est effectuée directement par l'âme 26 de la plaque d'extrémité 24. Le bloc de raccordement 32 est maintenu sur l'échangeur de chaleur par l'intermédiaire de deux rivets 68 qui traversent les rebords 66 et les bords tombés 28.The connection block 32 includes two spaced apart flanges 66 located in the extension of the external faces 42 of the block. The flanges 66 extend beyond the underside 38 of the block and these two edges provide between them a space whose width corresponds to that of the end plate 24. The flanges 66 are adapted to come to cap respectively the two fallen edges 28 of the plate 24. As in the case of FIGS. 1 to 4, the block 32 is provided with a threaded end piece 46 providing an internal passage 52 opening into two cylindrical bores 54 and 54 ′. The latter are suitable for receiving the ends 34 and 34 ′ of the tubes 12 and 12 ′, with the interposition of O-ring seals 58 and 58 ′. However, in the embodiment of FIGS. 5 and 6, the compression of the seals 58 and 58 ′ is carried out directly by the core 26 of the end plate 24. The connection block 32 is held on the heat exchanger by means of two rivets 68 which cross the edges 66 and the fallen edges 28.

On se réfère maintenant aux figures 7 et 9 qui concernent une autre variante de réalisation de l'invention.Reference is now made to FIGS. 7 and 9 which relate to another variant embodiment of the invention.

Dans cette variante, les extrémités des tubes en épingle 12 sont emmanchées et serties sur les crosses 14, au lieu d'être brasées comme dans les formes de réalisation précédentes. Le sertissage des extrémités des tubes sur les crosses est effectué simultanément au moyen d'une plaque de serrage 70 qui constitue en même temps une plaque d'extrémité de l'échangeur de chaleur comme enseigné par le brevet français n° 82 11470 cité précédemment. La plaque 70 est réalisée par moulage, par exemple d'une matière plastique, et comprend une âme 72 de forte épaisseur qui s'étend parallèlement aux ailettes 22. Cette âme comprend une multiplicité de trous disposés suivant la même configuration géométrique que les extrémités des tubes du faisceau. Après introduction des extrémités des tubes du faisceau dans les trous correspondants de la plaque, et après introduction des crosses, la plaque est déplacée dans une direction parallèle à celle des tubes pour permettre le sertissage simultané des extrémités des tubes du faisceau dans les extrémités des crosses correspondantes.In this variant, the ends of the pin tubes 12 are fitted and crimped on the brackets 14, instead of being brazed as in the previous embodiments. The crimping of the ends of the tubes on the hooks is carried out simultaneously by means of a clamping plate 70 which at the same time constitutes an end plate of the heat exchanger as taught by French patent n ° 82 11470 cited above. The plate 70 is produced by molding, for example of a plastic material, and comprises a very thick core 72 which extends parallel to the fins 22. This core comprises a multiplicity of holes arranged in the same geometrical configuration as the ends of the beam tubes. After insertion of the ends of the bundle tubes into the corresponding holes of the plate, and after introduction of the hooks, the plate is moved in a direction parallel to that of the tubes to allow the simultaneous crimping of the ends of the tubes of the bundle into the ends of the corresponding hooks.

Conformément à l'invention, la plaque 70 est modifiée de manière à permettre le montage d'un dispositif de raccordement monobloc. L'âme 72 de la plaque 70 est munie, à l'une de ses extrémités, d'une paroi cylindrique 74 tournée du côté opposé aux ailettes 22 et munie d'un filetage externe 76 pour permettre le vissage d'un écrou de retenue 78.According to the invention, the plate 70 is modified so as to allow the mounting of a one-piece connection device. The core 72 of the plate 70 is provided, at one of its ends, with a cylindrical wall 74 turned on the side opposite to the fins 22 and provided with an external thread 76 to allow the screwing of a retaining nut 78.

La paroi 74 délimite intérieurement, en combinaison avec l'âme 72, un logement cylindrique 80 dans lequel débouchent les extrémités 34 et 34′ des tubes 12 et 12′ à raccorder.The wall 74 delimits internally, in combination with the core 72, a cylindrical housing 80 into which open the ends 34 and 34 ′ of the tubes 12 and 12 ′ to be connected.

Le logement cylindrique 80 reçoit un bloc de raccordement 82 délimité par une paroi cylindrique 84 dont le diamètre est légèrement inférieur au diamètre du logement cylindrique 80. Le bloc 82 est en outre limité par une face circulaire inférieure 86 et une face circulaire supérieure 88.The cylindrical housing 80 receives a connection block 82 delimited by a cylindrical wall 84 whose diameter is slightly less than the diameter of the cylindrical housing 80. The block 82 is further limited by a lower circular face 86 and an upper circular face 88.

Le bloc 82 comporte un logement axial 90 constitué par un alésage cylindrique étagé qui débouche, d'une part, dans la face supérieure 88 du bloc et, d'autre part, dans deux alésages cylindriques espacés 92 et 92′ débouchant dans la face inférieure 86 du bloc. Les alésages 92 et 92′ forment des logements pour recevoir les extrémités respectives 34 et 34′ des tubes 12 et 12′ à raccorder. L'étanchéité entre le bloc 82 et les extrémités 34 et 34′ est assurée par des joints annulaires 58 et 58′, comme dans le cas des réalisations précédentes. La tubulure de raccordement 36 est munie, à proximité de son extrémité 94, d'un bourrelet externe 96. Ce bourrelet est propre à prendre appui contre un épaulement 98 du logement 90, un joint annulaire d'étanchéité 100 étant interposé entre l'extrémité 94 de la tubulure 36 et la paroi interne du logement 90.The block 82 comprises an axial housing 90 constituted by a stepped cylindrical bore which opens, on the one hand, into the upper face 88 of the block and, on the other hand, into two spaced cylindrical bores 92 and 92 ′ opening into the lower face 86 of the block. The bores 92 and 92 ′ form housings to receive the respective ends 34 and 34 ′ of the tubes 12 and 12 ′ to be connected. The seal between the block 82 and the ends 34 and 34 ′ is ensured by annular seals 58 and 58 ′, as in the case of the preceding embodiments. The connection tube 36 is provided, near its end 94, with an external bead 96. This bead is able to bear against a shoulder 98 of the housing 90, an annular seal 100 being interposed between the end 94 of the tubing 36 and the internal wall of the housing 90.

L'écrou de serrage 78 est muni d'un orifice de passage 102 et comporte en outre un épaulement annulaire 104 qui entoure cet orifice de passage et qui est propre à prendre appui sur le bourrelet 92 de la tubulure.The clamping nut 78 is provided with a passage orifice 102 and further comprises an annular shoulder 104 which surrounds this passage orifice and which is capable of bearing on the bead 92 of the tubing.

Lorsque l'écrou 78 est serré sur le filetage 76 de la paroi 74, il assure à la fois la compression du joint 100 et par conséquent l'étanchéité du raccordement de la tubulure 36 et la compression des joints toriques 58 et 58′ assurant ainsi l'étanchéité du raccordement avec les tubes 12 et 12′.When the nut 78 is tightened on the thread 76 of the wall 74, it ensures both the compression of the seal 100 and therefore the tightness of the connection of the tube 36 and the compression of the O-rings 58 and 58 ′ thus ensuring the tightness of the connection with tubes 12 and 12 ′.

L'invention s'applique à tout type d'échangeur de chaleur à serpentin, en particulier à des condenseurs, mais aussi à des évaporateurs.The invention applies to any type of coil heat exchanger, in particular to condensers, but also to evaporators.

Claims (10)

  1. A serpentine heat exchanger comprising a bundle of hairpin tubes (12) joined by junction pieces (14) and extending through a multiplicity of fins (22), together with an end plate (24; 70), at least one of the tubes (12, 12') having an end portion (34, 34') extending beyond the end plate so as to be joined to a fluid flow pipe (36) by means of a connecting element (46; 90, 78) defining a reception socket (54, 54'; 92, 92') for the sealed fitting therein of the or each portion (34, 34') of the tube to be joined thereto, characterised in that it includes a connecting block (32; 82) equipped with connecting element (46; 90; 78) and fastening means (64; 68; 78) for fastening the connecting block (32; 82) on the end plate (24; 70) of the heat exchanger.
  2. An exchanger according to Claim 1, in which the end plate (24) of the heat exchanger includes a strap portion (26), extending parallel to the fins (22) and having two flanges (28; 30) extending at right angles to the strap portion, characterised in that the fastening means comprise screws, rivets or the like (64, 68) extending through the flanges.
  3. An exchanger according to Claim 2, in which the two flanges (30) of the end plate (24) extend away from the fins (22) of the heat exchanger, characterised in that the two flanges define, with the strap portion (26), a reception cavity for receiving the connecting block (32), with the latter having two opposed parallel faces (42) adapted to be held between the two flanges (30) of the end plate.
  4. An exchanger according to Claim 2, in which the two flanges (28) of the end plate (24) extend towards the fins (22) of the heat exchanger, characterised in that the connecting block (32) has two spaced-apart flanges (66) adapted to embrace the two respective flanges (28) of the end plate (24).
  5. An exchanger according to one of Claims 2 to 4, characterised in that the connecting element of the connecting block comprises a threaded mouthpiece (46), for connection to the pipe (36) by means of a nut (50).
  6. An exchanger according to Claim 1, in which the end plate is a clamping plate (70) having holes for gripping the junction pieces (14) on the hairpin tubes (12), characterised in that the plate (70) has a reception recess (80) for receiving the connecting block (82).
  7. An exchanger according to Claim 6, characterised in that the reception recess (80) is delimited by a cylindrical wall (74) which depends from the plate (70), and which is provided with an external thread (76), and in that the fastening means for the connecting block (82) comprise a retaining nut (78), arranged to be screwed onto the thread (76) of the wall (74) and having a through hole (102) for the pipe (36).
  8. An exchanger according to Claim 7, characterised in that the connecting block (82) has a recess (90) for the fitting of the pipe (36) therein, and in that the retaining nut (78) has an annular shoulder (104) surrounding the through hole (102) and adapted to bear on a bead (96) of the pipe.
  9. An exchanger according to one of Claims 1 to 8, characterised in that the reception recess of the connecting block (32; 82) has at least one socket (54, 54'; 92, 92') for receiving the end portion (34, 34') of a tube (12, 12') to be connected, with an annular sealing gasket (58, 58') interposed.
  10. The use of a connecting block for a heat exchanger according to one of Claims 1 to 9.
EP92400450A 1991-02-26 1992-02-20 Serpentine heat exchanger Expired - Lifetime EP0501855B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9102285 1991-02-26
FR9102285A FR2673275B1 (en) 1991-02-26 1991-02-26 DEVICE FOR CONNECTING A HEAT EXCHANGER, OF THE COIL TYPE, TO A FLUID CIRCULATION TUBING.

Publications (2)

Publication Number Publication Date
EP0501855A1 EP0501855A1 (en) 1992-09-02
EP0501855B1 true EP0501855B1 (en) 1995-01-11

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EP92400450A Expired - Lifetime EP0501855B1 (en) 1991-02-26 1992-02-20 Serpentine heat exchanger

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EP (1) EP0501855B1 (en)
DE (1) DE69201143T2 (en)
FR (1) FR2673275B1 (en)

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FR2673275B1 (en) 1994-01-07
EP0501855A1 (en) 1992-09-02
FR2673275A1 (en) 1992-08-28
DE69201143T2 (en) 1995-05-11
US5224537A (en) 1993-07-06
DE69201143D1 (en) 1995-02-23

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