EP2333472B1 - Internal heat exchanger for a vehicule air conditioning circuit and such circuit - Google Patents

Internal heat exchanger for a vehicule air conditioning circuit and such circuit Download PDF

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Publication number
EP2333472B1
EP2333472B1 EP10194416.3A EP10194416A EP2333472B1 EP 2333472 B1 EP2333472 B1 EP 2333472B1 EP 10194416 A EP10194416 A EP 10194416A EP 2333472 B1 EP2333472 B1 EP 2333472B1
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EP
European Patent Office
Prior art keywords
exchanger
external
tube
internal
passage
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EP10194416.3A
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German (de)
French (fr)
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EP2333472A1 (en
Inventor
Christophe Bernard
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Hutchinson SA
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Hutchinson SA
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Priority to PL10194416T priority Critical patent/PL2333472T3/en
Publication of EP2333472A1 publication Critical patent/EP2333472A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F28F1/20—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means being attachable to the element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
    • F28F1/36—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely the means being helically wound fins or wire spirals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/006—Details for charging or discharging refrigerants; Service stations therefor characterised by charging or discharging valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/14—Fins in the form of movable or loose fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2240/00—Spacing means

Definitions

  • the present invention relates to an internal heat exchanger coaxial tubular type for a motor vehicle air conditioning circuit, and such an air conditioning circuit incorporating this exchanger.
  • a heat exchanger is of metal type and is connected to the corresponding pipes of the air conditioning circuit which comprise in particular hoses, via connectors mounted at each end of the exchanger, which may be for example of plate type , consisting of a stack of flat tubes and carrying out the heat exchange both by convection with the air outside the exchanger and by conduction, or of multitube type which in its simplest version is of the coaxial tubular type against the current, then realizing the heat exchange without the aforementioned convection.
  • At least one metal female connector is generally used for the relevant end of the exchanger, which is welded to or brazed on both the inner and outer tubes of the exchanger so as to define passage ducts for the fluid. communicating in a sealed manner with these internal and external channels.
  • Patent documents WO-A1-2007 / 013439 and EP-A1-1 762 806 have such internal heat exchangers which are respectively equipped with two female connectors and a single female connector, in these two cases via three lines of solder or solder at the corresponding end of the exchanger.
  • a major disadvantage of these known internal coaxial fins exchangers is that we must give up making taps on the outer tube to the right of these fins to connect in particular valves or tubes supporting sensors, or while we must before machining the profiles forming the inner and / or outer tubes at the location of the fins they comprise in the exchanger area (usually end) precisely intended to receive these connections, which increases the cost of manufacture exchangers.
  • An object of the present invention is to provide such a coaxial tubular type internal exchanger comprising two low and high pressure portions traversed by a refrigerant, the exchanger defining inside an inner tube at least one radially internal channel. preferably for the low pressure fluid and a radially channel external preferably for the high pressure fluid formed between the inner tube and an outer tube exchanger that can overcome these disadvantages.
  • an exchanger according to the invention is such that spacing means of thermal conductivity lower than that of the inner and outer tubes are mounted movable at least in translation between these two tubes and extend axially on only a part of the length of the external channel, at least one zone of the latter devoid of these means being intended to be connected to a stitch, such as a valve body or a support tube of a sensor, by a connecting orifice formed in the outer tube to the right of this area.
  • these spacing means which provide a spacer function (ie of spacer) between these tubes thus make it possible, because of their thermal conductivity lower than that of the latter, to avoid a thermal coupling. in the form of thermal bridges between these two inner and outer tubes.
  • these spacing means may be made of a metallic material (typically of thermal conductivity lower than that of aluminum in the case of tubes based on this metal) or plastic (eg based on a polyamide) .
  • these spacing means which are intended to generate turbulence for the fluid flowing in the external channel so as to optimize the heat transfer between the high and low pressure fluids, can extend axially. in a continuous or discontinuous manner on said portion of the outer channel ending with at least one connecting end of the outer tube.
  • these spacing means are formed by a plurality of longitudinal ribs circumferentially connected between their respective bases by a substantially cylindrical wall adapted to fit the inner tube, so that the total radial height of this wall and each rib is substantially equal to that of the outer channel.
  • these spacing means are formed by at least one spiral rib adapted to fit the inner tube extending helically around the latter in a constant or variable pitch.
  • this mounted and sliding mounting spacing means between the inner and outer tubes allows to position precisely in anticipation of the or each tapping to be performed on the outer tube, by sliding axially beforehand out of the or each zone of the stitching to provide one or more free space (s) allowing this (s) quilting (s).
  • connections which are thus facilitated by the adjustable positioning of the spacing means, can for example be used to connect to the body exchanger refrigerant filling valves, tubes supporting pressure or temperature sensors or any other tubing or radial connection piece (ie whose axis is perpendicular to the axial direction of the exchanger).
  • these spacing means can be advantageously mounted in contact with the inner and outer tubes so as to serve as radial spacers between these tubes to ensure their concentricity. Also advantageously, in the case where the exchanger is of the type having at least one bent or curved section, these spacing means are preferably inserted at least at the location of this (s) section (s) and, for even more preferential, over most of the axial length of the external channel.
  • these spacing means thus make it possible to "absorb" the bending and / or curvature radii of the inner and outer tubes of the exchanger along its length, which makes it possible to maintain the passage section for the fluid in the external channel substantially constant and therefore not to hinder the heat exchange in the bent or curved sections.
  • an exchanger according to the invention may incorporate said tapping in line with said zone of the external channel devoid of these spacing means which is located near an end of the outer tube, this tapping being formed of a connecting pipe. the exchanger for conveying the fluid from or to the external channel.
  • the heat exchanger may advantageously be devoid of any high pressure / low pressure female connector for connecting the internal (s) and external (s) channels to the air conditioning circuit.
  • this exchanger is then exclusively made up of the inner tube, the outer tube and said spacing means, which do not oppose a stitch communicating with the external channel and do not have to be machined either. to allow this stitching, as explained above.
  • the inner tube has at at least one of its ends a protruding portion which projects axially beyond the corresponding end of the outer tube being integral with the latter end and which forms alone - in place of the aforementioned female connector - another connecting pipe of the exchanger for conveying the fluid from or towards the or each internal channel.
  • this end of the outer tube can be secured to the inner tube by a simple necking of this end, for example obtained by knurling, followed by a circumferential attachment of this end to this inner tube, for example implemented by welding, brazing, by magnetoforming (preferably in two stages, although only one step is possible) or by gluing.
  • the outer tube is secured in at least one of its ends to the inner tube by crimping with prior fitting between the respective ends of these tubes at one end of a hose connection to the air conditioning circuit, which pipe is optionally mounted in axial abutment against a flange of the inner tube.
  • An air conditioning circuit for a motor vehicle according to the invention is such that it comprises an internal heat exchanger as defined above, which is preferably connected to this circuit without high pressure / low pressure female connector.
  • the air conditioning circuit 1 illustrated in the figure 1 is in known manner a closed circuit or "loop" which comprises, in addition to an internal heat exchanger E, several elements distributed inside the engine compartment of the vehicle, in particular a compressor 2, a cooler or condenser 3 and an evaporator 4, and wherein circulates a refrigerant under pressure, such as R134a or R152, without limitation. All these elements are interconnected by rigid or flexible lines consisting of rigid tubular portions and / or flexible, which have at each of their ends sealed connection means.
  • the exchanger E is of coaxial type against the current, and is intended to cool the fluid from the HP line by conduction in contact with the same fluid from the BP line which is heated in exchange.
  • this exchanger E consists of a radially inner metal tube 10 which defines in its internal space an internal channel 11 for the fluid coming from the line BP and which is inserted axially inside a radially external tube 20 also of metal delimiting with the tube 20 an outer channel 21 of annular cross section for the fluid from the line HP.
  • a spacer insert 30 forming a spacer according to the first example of the invention which is intended to optimize the heat transfer between the HP and LP fluids by the generation of turbulence in the external channel 21, is slidably mounted between the tubes 10 and 20 and in contact therewith, being recessed at an adjustable axial distance from the connecting end 22 of the outer tube 20.
  • a stitching 40 such as a filling valve body or a support tube of a pressure sensor, for example by a connecting orifice 23 formed in the outer tube 20.
  • the insert 30 is formed by a plurality of ribs 31 circumferentially connected at their respective bases by a cylindrical wall 32 conforming to the wall of the inner tube 10, the total radial height of the wall 32 and each rib 31 being substantially equal to that of the external channel (To the mounting clearance near to allow the sliding of the insert 30).
  • a spacing insert 130 according to the second example of the invention is formed by a spiral rib conforming to both the inner tube 10 and the outer tube 20 of the exchanger E by extending helically thereabout (accord to a constant step in this embodiment, it being specified that this step could vary in the axial direction and that the spiral could be discontinuous along the outer channel 21).
  • the insert 30, 130 makes it possible at the same time to improve the heat transfer between HP and BP fluids and to serve as a radial spacer between these tubes to ensure their concentricity, in particular in bent or curved sections of exchanger E.
  • the inner tube 10 has a protruding portion 12 which protrudes axially from the end 22 of the tube 20 by being integral therewith and which constitutes the connecting pipe of the internal channel 11 of the exchanger E to the line BP of air conditioning circuit 1.
  • This end 22 of the tube 20 may be secured to the portion 12 of the tube 10 by a necking which is applied to it by knurling, followed by a circumferential attachment of the end 22 thus narrowed on this portion 12 tube of preferably by welding or soldering (it being specified that other methods such as magnetoforming or even gluing are usable).
  • the tube 120 is secured to the tube 110 by crimping with pre-fitting between the respective ends 112 and 122 of the tubes 110 and 120 of an end of a flexible hose 50 for connection to the circuit 1, this hose 50 being in this example mounted in axial abutment against a flange 113 of the tube 110 (schematically the deformations of the respective ends 112 and 122 of the tubes 110 and 120 due to this crimping in contact with the pipe 50).
  • the two embodiments of the Figures 6 and 7 have the advantage of allowing the connection of the corresponding end of the exchanger E to the rest of the air conditioning circuit 1 without requiring soldering or brazing of one or more female connector (s), whose massive structure and the preliminary machining required are disadvantages known for this connection because of their weight and the overall assembly overhead they represent for the exchanger E.

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

Abstract

The heat exchanger has a spacer unit i.e. spacer insert (30), with thermal conductivity lower than thermal conductivity of metallic radially internal and external tubes (10, 20). The spacer unit is movably mounted in translation between the tubes, and extends over a part of the length of a radially external passage (21). A region of the external passage which is devoid from the spacer unit is intended to be connected to a tapping (40) such as filling valve body or pressure sensor mounting nozzle, by a connecting orifice (23) formed in the external tube at right angle with the region.

Description

La présente invention concerne un échangeur thermique interne de type tubulaire coaxial pour un circuit de climatisation de véhicule automobile, et un tel circuit de climatisation incorporant cet échangeur.The present invention relates to an internal heat exchanger coaxial tubular type for a motor vehicle air conditioning circuit, and such an air conditioning circuit incorporating this exchanger.

Dans certains circuits de climatisation pour véhicules automobiles, il est nécessaire de réaliser un échange ou transfert thermique entre le fluide de la portion haute pression du circuit que l'on cherche à refroidir et le même fluide issu de la portion basse pression de ce circuit qui sert de source froide et qui est réchauffé en échange, pour améliorer le rendement du circuit. On utilise à cet effet un échangeur thermique dit interne, du fait qu'il ne recherche pas d'échange avec l'air extérieur au véhicule ni avec l'air de l'habitacle.In certain air conditioning circuits for motor vehicles, it is necessary to perform an exchange or heat transfer between the fluid of the high pressure portion of the circuit that is to be cooled and the same fluid from the low pressure portion of this circuit which serves as a cold source and is warmed in exchange, to improve the performance of the circuit. To this end, an internal heat exchanger is used, because it does not seek an exchange with the outside air of the vehicle or with the air of the passenger compartment.

De manière connue, un échangeur thermique est de type métallique et est connecté aux conduites correspondantes du circuit de climatisation qui comprennent en particulier des flexibles, via des connecteurs montés à chacune des extrémités de l'échangeur, lequel peut être par exemple de type à plaque, étant constitué d'un empilement de tubes plats et réalisant l'échange thermique tant par convection avec l'air extérieur à l'échangeur que par conduction, ou bien de type à multitubes qui dans sa version la plus simple est de type tubulaire coaxial à contre-courant, réalisant alors l'échange thermique sans la convection précitée.In known manner, a heat exchanger is of metal type and is connected to the corresponding pipes of the air conditioning circuit which comprise in particular hoses, via connectors mounted at each end of the exchanger, which may be for example of plate type , consisting of a stack of flat tubes and carrying out the heat exchange both by convection with the air outside the exchanger and by conduction, or of multitube type which in its simplest version is of the coaxial tubular type against the current, then realizing the heat exchange without the aforementioned convection.

Dans ce dernier cas et notamment avec des fluides tels que le R134a ou le R152, cet échangeur coaxial définit généralement :

  • à l'intérieur d'un tube interne de l'échangeur, au moins un canal radialement interne destiné à véhiculer le fluide issu de la portion basse pression du circuit, et
  • radialement entre ce tube interne et un tube externe formant enveloppe pour l'échangeur, un canal radialement externe usuellement pourvu d'ailettes longitudinales conçues pour optimiser le transfert thermique entre les fluides circulant dans les canaux interne(s) et externe qui sont réparties sur sa circonférence et qui peuvent être solidaires des tubes interne et/ou externe ou encore rapportées entre ces deux tubes, comme illustré par exemple dans le document US-A-6 434 972 .
In the latter case and in particular with fluids such as R134a or R152, this coaxial exchanger generally defines:
  • inside an inner tube of the exchanger, at least one radially internal channel intended to convey the fluid coming from the low pressure portion of the circuit, and
  • radially between this inner tube and an outer tube forming a shell for the exchanger, a radially outer channel usually provided with longitudinal fins designed to optimize the heat transfer between the fluids circulating in the internal (s) and external channels which are distributed over its circumference and which may be integral with the inner and / or outer tubes or reported between these two tubes, as illustrated for example in the document US-A-6,434,972 .

On utilise alors généralement au moins un connecteur femelle métallique pour l'extrémité concernée de l'échangeur que l'on soude ou brase à la fois sur les tubes interne et externe de l'échangeur de sorte à définir des conduits de passage pour le fluide communiquant de manière étanche avec ces canaux interne et externe.In this case, at least one metal female connector is generally used for the relevant end of the exchanger, which is welded to or brazed on both the inner and outer tubes of the exchanger so as to define passage ducts for the fluid. communicating in a sealed manner with these internal and external channels.

Les documents de Brevet WO-A1-2007/013439 et EP-A1-1 762 806 présentent de tels échangeurs thermiques internes qui sont respectivement équipés de deux connecteurs femelles et d'un seul connecteur femelle, dans ces deux cas via trois lignes de soudure ou de brasure à l'extrémité correspondante de l'échangeur.Patent documents WO-A1-2007 / 013439 and EP-A1-1 762 806 have such internal heat exchangers which are respectively equipped with two female connectors and a single female connector, in these two cases via three lines of solder or solder at the corresponding end of the exchanger.

Un inconvénient majeur de ces échangeurs internes coaxiaux connus à ailettes est que l'on doit renoncer à réaliser des piquages sur le tube externe au droit de ces ailettes pour y raccorder notamment des valves ou tubulures supportant des capteurs, ou alors que l'on doit usiner au préalable les profilés formant les tubes interne et/ou externe à l'emplacement des ailettes qu'ils comportent dans la zone de l'échangeur (usuellement d'extrémité) précisément destinée à recevoir ces piquages, ce qui augmente le coût de fabrication des échangeurs.A major disadvantage of these known internal coaxial fins exchangers is that we must give up making taps on the outer tube to the right of these fins to connect in particular valves or tubes supporting sensors, or while we must before machining the profiles forming the inner and / or outer tubes at the location of the fins they comprise in the exchanger area (usually end) precisely intended to receive these connections, which increases the cost of manufacture exchangers.

Un autre inconvénient des échangeurs internes coaxiaux connus équipés de connecteurs réside dans le poids relativement élevé de ces connecteurs qui doivent être en outre usinés précisément puis soudés ou brasés pour leur solidarisation avec les tubes interne et externe des échangeurs, ce qui contribue également à augmenter le coût de fabrication et d'assemblage de ces derniers.Another drawback of known coaxial internal heat exchangers equipped with connectors lies in the relatively high weight of these connectors, which must also be machined precisely and then soldered or brazed to make them integral with the inner and outer tubes of the heat exchangers, which also contributes to increasing the cost of manufacturing and assembly of these.

Un but de la présente invention est de proposer un tel échangeur interne de type tubulaire coaxial comportant deux portions de basse et haute pression parcourues par un fluide frigorigène, l'échangeur définissant à l'intérieur d'un tube interne au moins un canal radialement interne de préférence pour le fluide basse pression et un canal radialement externe de préférence pour le fluide haute pression formé entre ce tube interne et un tube externe, échangeur qui permette de remédier à ces inconvénients.An object of the present invention is to provide such a coaxial tubular type internal exchanger comprising two low and high pressure portions traversed by a refrigerant, the exchanger defining inside an inner tube at least one radially internal channel. preferably for the low pressure fluid and a radially channel external preferably for the high pressure fluid formed between the inner tube and an outer tube exchanger that can overcome these disadvantages.

A cet effet, un échangeur selon l'invention est tel que des moyens d'espacement de conductibilité thermique inférieure à celle des tubes interne et externe sont montés mobiles au moins en translation entre ces deux tubes et s'étendent axialement sur une partie seulement de la longueur du canal externe, au moins une zone de ce dernier dépourvue de ces moyens étant destinée à être raccordée à un piquage, tel qu'un corps de valve ou une tubulure de support d'un capteur, par un orifice de raccordement formé dans le tube externe au droit de cette zone.For this purpose, an exchanger according to the invention is such that spacing means of thermal conductivity lower than that of the inner and outer tubes are mounted movable at least in translation between these two tubes and extend axially on only a part of the length of the external channel, at least one zone of the latter devoid of these means being intended to be connected to a stitch, such as a valve body or a support tube of a sensor, by a connecting orifice formed in the outer tube to the right of this area.

On notera que ces moyens d'espacement selon l'invention qui assurent une fonction d'espaceur (i.e. d'entretoise) entre ces tubes permettent ainsi, du fait de leur conductibilité thermique inférieure à celle de ces derniers, d'éviter un couplage thermique sous forme de ponts thermiques entre ces deux tubes interne et externe. A titre exemplatif, ces moyens d'espacement peuvent être réalisés en un matériau métallique (typiquement de conductibilité thermique inférieure à celle de l'aluminium dans le cas de tubes à base de ce métal) ou plastique (e.g. à base d'un polyamide).It should be noted that these spacing means according to the invention which provide a spacer function (ie of spacer) between these tubes thus make it possible, because of their thermal conductivity lower than that of the latter, to avoid a thermal coupling. in the form of thermal bridges between these two inner and outer tubes. By way of example, these spacing means may be made of a metallic material (typically of thermal conductivity lower than that of aluminum in the case of tubes based on this metal) or plastic (eg based on a polyamide) .

Selon une autre caractéristique de l'invention, ces moyens d'espacement, qui sont destinés à générer des turbulences pour le fluide circulant dans le canal externe de sorte à optimiser le transfert thermique entre les fluides haute et basse pression, peuvent s'étendre axialement de manière continue ou discontinue sur ladite partie du canal externe en se terminant en retrait d'au moins une extrémité de raccordement du tube externe.According to another characteristic of the invention, these spacing means, which are intended to generate turbulence for the fluid flowing in the external channel so as to optimize the heat transfer between the high and low pressure fluids, can extend axially. in a continuous or discontinuous manner on said portion of the outer channel ending with at least one connecting end of the outer tube.

Selon un premier exemple de réalisation de l'invention, ces moyens d'espacement sont formés par plusieurs nervures longitudinales reliées circonférentiellement entre leurs bases respectives par une paroi sensiblement cylindrique apte à épouser le tube interne, de telle sorte que la hauteur radiale totale de cette paroi et de chaque nervure soit sensiblement égale à celle du canal externe.According to a first exemplary embodiment of the invention, these spacing means are formed by a plurality of longitudinal ribs circumferentially connected between their respective bases by a substantially cylindrical wall adapted to fit the inner tube, so that the total radial height of this wall and each rib is substantially equal to that of the outer channel.

Selon un second exemple de réalisation de l'invention, ces moyens d'espacement sont formés par au moins une nervure spiralée apte à épouser le tube interne en s'étendant en hélice autour de ce dernier selon un pas constant ou variable.According to a second embodiment of the invention, these spacing means are formed by at least one spiral rib adapted to fit the inner tube extending helically around the latter in a constant or variable pitch.

On notera que ce montage rapporté et coulissant des moyens d'espacement entre les tubes interne et externe permet de les positionner précisément en prévision du ou de chaque piquage à réaliser sur le tube externe, en les faisant coulisser au préalable axialement hors de la ou de chaque zone du piquage pour ménager un ou des espace(s) libre(s) permettant ce(s) piquage(s). On se dispense ainsi totalement de la nécessité selon l'art antérieur d'utiliser des tubes internes ou externes à ailettes localement usinées dans les zones destinées aux piquages, ce qui permet d'abaisser le coût de fabrication de l'échangeur.It will be noted that this mounted and sliding mounting spacing means between the inner and outer tubes allows to position precisely in anticipation of the or each tapping to be performed on the outer tube, by sliding axially beforehand out of the or each zone of the stitching to provide one or more free space (s) allowing this (s) quilting (s). This completely eliminates the need according to the prior art to use internal or external finned tubes locally machined in the areas intended for taps, which allows to lower the manufacturing cost of the exchanger.

On notera également que ces piquages qui sont ainsi facilités grâce au positionnement réglable des moyens d'espacement peuvent par exemple permettre le raccordement à l'échangeur de corps de valves de remplissage en fluide frigorigène, de tubulures supportant des capteurs de pression ou de température ou toute autre tubulure ou embout de raccordement radial (i.e. dont l'axe est perpendiculaire à la direction axiale de l'échangeur).It will also be noted that these connections, which are thus facilitated by the adjustable positioning of the spacing means, can for example be used to connect to the body exchanger refrigerant filling valves, tubes supporting pressure or temperature sensors or any other tubing or radial connection piece (ie whose axis is perpendicular to the axial direction of the exchanger).

Selon une autre caractéristique de l'invention, ces moyens d'espacement peuvent être avantageusement montés au contact des tubes interne et externe de sorte à servir d'entretoises radiales entre ces tubes pour assurer leur concentricité. Egalement avantageusement, dans le cas où l'échangeur est de type présentant au moins un tronçon coudé ou cintré, ces moyens d'espacement sont de préférence insérés au moins à l'emplacement de ce(s) tronçon(s) et, à titre encore plus préférentiel, sur la majeure partie de la longueur axiale du canal externe.According to another characteristic of the invention, these spacing means can be advantageously mounted in contact with the inner and outer tubes so as to serve as radial spacers between these tubes to ensure their concentricity. Also advantageously, in the case where the exchanger is of the type having at least one bent or curved section, these spacing means are preferably inserted at least at the location of this (s) section (s) and, for even more preferential, over most of the axial length of the external channel.

On notera que ces moyens d'espacement selon l'invention permettent ainsi « d'absorber » les rayons de cintrage et/ou de courbure des tubes interne et externe de l'échangeur sur sa longueur, ce qui permet de maintenir la section de passage pour le fluide dans le canal externe sensiblement constante et donc de ne pas entraver l'échange thermique dans les tronçons coudés ou cintrés.It will be noted that these spacing means according to the invention thus make it possible to "absorb" the bending and / or curvature radii of the inner and outer tubes of the exchanger along its length, which makes it possible to maintain the passage section for the fluid in the external channel substantially constant and therefore not to hinder the heat exchange in the bent or curved sections.

Avantageusement, un échangeur selon l'invention peut incorporer ledit piquage au droit de ladite zone du canal externe dépourvue de ces moyens d'espacement qui est située à proximité d'une extrémité du tube externe, ce piquage étant formé d'une tubulure de raccordement de l'échangeur destinée à véhiculer le fluide provenant de ou en direction du canal externe.Advantageously, an exchanger according to the invention may incorporate said tapping in line with said zone of the external channel devoid of these spacing means which is located near an end of the outer tube, this tapping being formed of a connecting pipe. the exchanger for conveying the fluid from or to the external channel.

Selon une autre caractéristique de l'invention, l'échangeur peut être avantageusement dépourvu de tout connecteur femelle haute pression/ basse pression pour le raccordement des canaux interne(s) et externe(s) au circuit de climatisation. En d'autres termes, cet échangeur est alors exclusivement constitué du tube interne, du tube externe et desdits moyens d'espacement, lesquels ne s'opposent pas à un piquage communiquant avec le canal externe et n'ont pas non plus à être usinés pour permettre ce piquage, comme expliqué ci-dessus.According to another characteristic of the invention, the heat exchanger may advantageously be devoid of any high pressure / low pressure female connector for connecting the internal (s) and external (s) channels to the air conditioning circuit. In other words, this exchanger is then exclusively made up of the inner tube, the outer tube and said spacing means, which do not oppose a stitch communicating with the external channel and do not have to be machined either. to allow this stitching, as explained above.

On notera que cette absence de connecteur femelle (usuellement en aluminium) permet de réduire d'une manière significative la masse de l'échangeur selon l'invention, et en outre son coût global de fabrication et d'assemblage qui par le passé était grevé par les opérations d'usinage du ou de chaque connecteur.It will be noted that this absence of female connector (usually made of aluminum) makes it possible to significantly reduce the mass of the exchanger according to the invention, and in addition its overall manufacturing and assembly cost which in the past was encumbered. by the machining operations of the or each connector.

On notera également que les tubes interne et externe de l'échangeur selon l'invention qui n'ont plus à être usinés au niveau des profilés d'espacement peuvent être ainsi être utilisés directement suite à leur façonnage.It will also be noted that the inner and outer tubes of the exchanger according to the invention which no longer have to be machined at the level of the spacing profiles can thus be used directly after their forming.

Selon un premier mode de réalisation de l'invention qui est facilité par le montage coulissant précité des moyens d'espacement, le tube interne présente en l'une au moins de ses extrémités une portion de dépassement qui dépasse axialement de l'extrémité correspondante du tube externe en étant solidaire de cette dernière extrémité et qui forme à elle seule - en lieu et place du connecteur femelle précité - une autre tubulure de raccordement de l'échangeur destinée à véhiculer le fluide provenant de ou en direction du ou de chaque canal interne. Dans ce cas, cette extrémité du tube externe peut être solidarisée avec le tube interne par un simple rétreint de cette extrémité par exemple obtenu par moletage, suivi d'une fixation circonférentielle de cette extrémité sur ce tube interne par exemple mise en oeuvre par soudage, brasage, par magnétoformage (de préférence en deux étapes, bien qu'une seule étape soit envisageable) ou par collage.According to a first embodiment of the invention which is facilitated by the aforementioned sliding assembly of the spacing means, the inner tube has at at least one of its ends a protruding portion which projects axially beyond the corresponding end of the outer tube being integral with the latter end and which forms alone - in place of the aforementioned female connector - another connecting pipe of the exchanger for conveying the fluid from or towards the or each internal channel. In this case, this end of the outer tube can be secured to the inner tube by a simple necking of this end, for example obtained by knurling, followed by a circumferential attachment of this end to this inner tube, for example implemented by welding, brazing, by magnetoforming (preferably in two stages, although only one step is possible) or by gluing.

Selon un second mode de réalisation de l'invention qui est également facilité par le montage coulissant précité des moyens d'espacement, le tube externe est solidarisé en l'une au moins de ses extrémités avec le tube interne par sertissage avec emmanchement préalable entre les extrémités respectives de ces tubes d'une extrémité d'un tuyau souple de raccordement au circuit de climatisation, lequel tuyau est optionnellement monté en butée axiale contre une collerette du tube interne. On notera que cette seule opération de sertissage permet alors de raccorder les deux tubes interne et externe de l'échangeur au flexible adjacent du circuit de climatisation.According to a second embodiment of the invention which is also facilitated by the abovementioned sliding assembly of the spacing means, the outer tube is secured in at least one of its ends to the inner tube by crimping with prior fitting between the respective ends of these tubes at one end of a hose connection to the air conditioning circuit, which pipe is optionally mounted in axial abutment against a flange of the inner tube. It will be noted that this single crimping operation then makes it possible to connect the two inner and outer tubes of the exchanger to the adjacent hose of the air conditioning circuit.

Un circuit de climatisation pour véhicule automobile selon l'invention est tel qu'il comporte un échangeur thermique interne tel que défini ci-dessus, qui est de préférence raccordé à ce circuit sans connecteur femelle haute pression/ basse pression.An air conditioning circuit for a motor vehicle according to the invention is such that it comprises an internal heat exchanger as defined above, which is preferably connected to this circuit without high pressure / low pressure female connector.

D'autres caractéristiques, avantages et détails de l'invention ressortiront à la lecture de la description suivante de plusieurs exemples de réalisation de l'invention, donnés à titre illustratif et non limitatif, la description étant réalisée en référence avec les dessins joints, parmi lesquels :

  • la figure 1 est une vue schématique d'un circuit de climatisation pour véhicule automobile incorporant un échangeur thermique interne selon l'invention,
  • la figure 2 est une vue en perspective d'un insert d'espacement selon un premier exemple de l'invention à insérer dans l'échangeur thermique interne de la figure 1,
  • la figure 3 est une vue partielle, en coupe longitudinale et en partie en perspective, d'une extrémité de raccordement d'un échangeur selon ce premier exemple de l'invention incorporant l'insert de la figure 2,
  • la figure 4 est une vue en perspective d'un insert d'espacement selon un second exemple de l'invention à insérer dans l'échangeur de la figure 1,
  • la figure 5 est une vue partielle, en coupe longitudinale et en partie en perspective, d'une extrémité de raccordement d'un échangeur selon ce second exemple de l'invention incorporant l'insert de la figure 4,
  • la figure 6 est une vue partielle en perspective d'une extrémité de raccordement d'un échangeur thermique interne selon un premier mode de l'invention, notamment en référence aux exemples des figures 3 et 5, et
  • la figure 7 est une vue schématique partielle en demi-coupe longitudinale d'une extrémité de raccordement d'un échangeur thermique interne selon un second mode de l'invention, notamment en référence aux exemples des figures 3 et 5.
Other features, advantages and details of the invention will emerge on reading the following description of several examples of embodiments of the invention, given by way of illustration and not limitation, the description being made with reference to the accompanying drawings, among which :
  • the figure 1 is a schematic view of an air conditioning circuit for a motor vehicle incorporating an internal heat exchanger according to the invention,
  • the figure 2 is a perspective view of a spacer insert according to a first example of the invention to be inserted into the internal heat exchanger of the figure 1 ,
  • the figure 3 is a partial view, in longitudinal section and partly in perspective, of a connecting end of an exchanger according to this first example of the invention incorporating the insert of the figure 2 ,
  • the figure 4 is a perspective view of a spacer insert according to a second example of the invention to be inserted into the heat exchanger of the figure 1 ,
  • the figure 5 is a partial view, in longitudinal section and partly in perspective, of a connecting end of an exchanger according to this second example of the invention incorporating the insert of the figure 4 ,
  • the figure 6 is a partial perspective view of a connection end of an internal heat exchanger according to a first embodiment of the invention, in particular with reference to the examples of figures 3 and 5 , and
  • the figure 7 is a partial schematic view in longitudinal half-section of a connecting end of an internal heat exchanger according to a second embodiment of the invention, in particular with reference to the examples of figures 3 and 5 .

Le circuit de climatisation 1 illustré à la figure 1 est de manière connue un circuit fermé ou « boucle » qui comprend, outre un échangeur thermique interne E, plusieurs éléments répartis à l'intérieur du compartiment moteur du véhicule, notamment un compresseur 2, un refroidisseur ou condenseur 3 et un évaporateur 4, et dans lequel circule un fluide frigorigène sous pression, tel que du R134a ou du R152, à titre non limitatif. Tous ces éléments sont reliés entre eux par des lignes rigides ou flexibles constitués par des portions tubulaires rigides et/ou souples, qui présentent en chacune de leurs extrémités des moyens de raccordement étanches.The air conditioning circuit 1 illustrated in the figure 1 is in known manner a closed circuit or "loop" which comprises, in addition to an internal heat exchanger E, several elements distributed inside the engine compartment of the vehicle, in particular a compressor 2, a cooler or condenser 3 and an evaporator 4, and wherein circulates a refrigerant under pressure, such as R134a or R152, without limitation. All these elements are interconnected by rigid or flexible lines consisting of rigid tubular portions and / or flexible, which have at each of their ends sealed connection means.

Plus précisément, le circuit 1 comporte :

  • une ligne basse pression BP destinée à véhiculer le fluide frigorigène entre le l'évaporateur 4 et le compresseur 2, à travers l'échangeur E via une entrée eBP de fluide basse pression à réchauffer et une sortie sBP de ce fluide ainsi réchauffé, et
  • une ligne haute pression HP destinée à véhiculer ce même fluide en aval du compresseur 2 et du refroidisseur 3 via une entrée eHP de fluide haute pression à refroidir et une sortie sHP de ce fluide ainsi refroidi, une valve de détente 5 étant agencée en aval de cette sortie sHP et en amont de l'évaporateur 4.
More specifically, the circuit 1 comprises:
  • a low-pressure line BP for conveying the refrigerant between the evaporator 4 and the compressor 2, through the exchanger E via a low pressure fluid inlet e BP to be heated and a BP output of the fluid thus heated, and
  • an HP high pressure line for conveying the same fluid downstream of the compressor 2 and the cooler 3 via an HP input e high pressure fluid to be cooled and an outlet s HP of this fluid thus cooled, an expansion valve 5 being arranged downstream of this outlet s HP and upstream of the evaporator 4.

L'échangeur E est de type coaxial à contre-courant, et il est destiné à refroidir le fluide issu de la ligne HP par conduction au contact du même fluide issu de la ligne BP qui est réchauffé en échange. A cet effet et comme illustré dans l'exemple de la figure 3, cet échangeur E est constitué d'un tube radialement interne métallique 10 qui délimite dans son espace intérieur un canal interne 11 pour le fluide issu de la ligne BP et qui est inséré axialement à l'intérieur d'un tube radialement externe 20 également métallique délimitant avec le tube 20 un canal externe 21 de section transversale annulaire pour le fluide issu de la ligne HP.The exchanger E is of coaxial type against the current, and is intended to cool the fluid from the HP line by conduction in contact with the same fluid from the BP line which is heated in exchange. For this purpose and as illustrated in the example of figure 3 this exchanger E consists of a radially inner metal tube 10 which defines in its internal space an internal channel 11 for the fluid coming from the line BP and which is inserted axially inside a radially external tube 20 also of metal delimiting with the tube 20 an outer channel 21 of annular cross section for the fluid from the line HP.

Comme illustré aux figures 2 et 3, un insert d'espacement 30 formant entretoise selon le premier exemple de l'invention, qui est destiné à optimiser le transfert thermique entre les fluides HP et BP par la génération de turbulences dans le canal externe 21, est monté coulissant entre les tubes 10 et 20 et au contact de ceux-ci, en étant disposé en retrait selon une distance axiale réglable de l'extrémité de raccordement 22 du tube externe 20. De cette manière, la zone d'extrémité du canal externe 21 qui est totalement libre d'accès - du fait qu'elle est dépourvue de l'insert 30 - peut être raccordée aisément à un piquage 40, tel qu'un corps de valve de remplissage ou une tubulure de support d'un capteur de pression, par exemple, par un orifice de raccordement 23 formé dans le tube externe 20.As illustrated in Figures 2 and 3 a spacer insert 30 forming a spacer according to the first example of the invention, which is intended to optimize the heat transfer between the HP and LP fluids by the generation of turbulence in the external channel 21, is slidably mounted between the tubes 10 and 20 and in contact therewith, being recessed at an adjustable axial distance from the connecting end 22 of the outer tube 20. In this way, the end zone of the outer channel 21 which is completely free of access - because it is devoid of the insert 30 - can be easily connected to a stitching 40, such as a filling valve body or a support tube of a pressure sensor, for example by a connecting orifice 23 formed in the outer tube 20.

L'insert 30 est formé par plusieurs nervures 31 reliées circonférentiellement en leurs bases respectives par une paroi cylindrique 32 épousant la paroi du tube interne 10, la hauteur radiale totale de la paroi 32 et de chaque nervure 31 étant sensiblement égale à celle du canal externe (au jeu de montage près pour permettre le coulissement de l'insert 30).The insert 30 is formed by a plurality of ribs 31 circumferentially connected at their respective bases by a cylindrical wall 32 conforming to the wall of the inner tube 10, the total radial height of the wall 32 and each rib 31 being substantially equal to that of the external channel (To the mounting clearance near to allow the sliding of the insert 30).

Comme visible aux figures 4 et 5, un insert d'espacement 130 selon le second exemple de l'invention est formé par une nervure spiralée épousant à la fois le tube interne 10 et le tube externe 20 de l'échangeur E en s'étendant en hélice autour de ce dernier (selon un pas constant dans cet exemple de réalisation, étant précisé que ce pas pourrait varier dans la direction axiale et que la spirale pourrait être discontinue le long du canal externe 21).As visible to Figures 4 and 5 , a spacing insert 130 according to the second example of the invention is formed by a spiral rib conforming to both the inner tube 10 and the outer tube 20 of the exchanger E by extending helically thereabout ( according to a constant step in this embodiment, it being specified that this step could vary in the axial direction and that the spiral could be discontinuous along the outer channel 21).

Comme indiqué précédemment, on notera que l'insert 30, 130 permet à la fois d'améliorer le transfert thermique entre fluides HP et BP et de servir d'entretoise radiale entre ces tubes pour assurer leur concentricité, notamment dans des tronçons coudés ou cintrés de l'échangeur E.As indicated above, it will be noted that the insert 30, 130 makes it possible at the same time to improve the heat transfer between HP and BP fluids and to serve as a radial spacer between these tubes to ensure their concentricity, in particular in bent or curved sections of exchanger E.

Dans le mode de réalisation de la figure 6, qui intègre par exemple l'insert 30, 130 des figures 2 ou 4, le tube interne 10 présente une portion de dépassement 12 qui dépasse axialement de l'extrémité 22 du tube 20 en étant solidaire de celle-ci et qui constitue la tubulure de raccordement du canal interne 11 de l'échangeur E à la ligne BP du circuit de climatisation 1. Cette extrémité 22 du tube 20 peut être solidarisée avec la portion 12 du tube 10 par un rétreint qui lui est appliqué par moletage, suivi d'une fixation circonférentielle de l'extrémité 22 ainsi rétreinte sur cette portion 12 tube de préférence par soudage ou brasage (étant précisé que d'autres méthodes telles que le magnétoformage ou même un collage sont utilisables).In the embodiment of the figure 6 , which integrates for example the insert 30, 130 of figures 2 or 4 , the inner tube 10 has a protruding portion 12 which protrudes axially from the end 22 of the tube 20 by being integral therewith and which constitutes the connecting pipe of the internal channel 11 of the exchanger E to the line BP of air conditioning circuit 1. This end 22 of the tube 20 may be secured to the portion 12 of the tube 10 by a necking which is applied to it by knurling, followed by a circumferential attachment of the end 22 thus narrowed on this portion 12 tube of preferably by welding or soldering (it being specified that other methods such as magnetoforming or even gluing are usable).

Dans le mode de réalisation de la figure 7, qui intègre également par exemple l'insert 30, 130 des figures 2 ou 4, le tube 120 est solidarisé avec le tube 110 par sertissage avec emmanchement préalable entre les extrémités respectives 112 et 122 des tubes 110 et 120 d'une extrémité d'un tuyau souple 50 de raccordement au circuit 1, ce tuyau 50 étant dans cet exemple monté en butée axiale contre une collerette 113 du tube 110 (on a représenté schématiquement les déformations des extrémités respectives 112 et 122 des tubes 110 et 120 due à ce sertissage au contact du tuyau 50).In the embodiment of the figure 7 , which also integrates for example the insert 30, 130 of figures 2 or 4 , the tube 120 is secured to the tube 110 by crimping with pre-fitting between the respective ends 112 and 122 of the tubes 110 and 120 of an end of a flexible hose 50 for connection to the circuit 1, this hose 50 being in this example mounted in axial abutment against a flange 113 of the tube 110 (schematically the deformations of the respective ends 112 and 122 of the tubes 110 and 120 due to this crimping in contact with the pipe 50).

On notera que les deux modes de réalisation des figures 6 et 7 présentent l'avantage de permettre le raccordement de l'extrémité correspondante de l'échangeur E au reste du circuit de climatisation 1 sans requérir un soudage ou brasage d'un ou plusieurs connecteur(s) femelle(s), dont la structure massive et l'usinage préalable requis sont des inconvénients connus pour ce raccordement en raison de leur poids et du surcoût global d'assemblage qu'ils représentent pour l'échangeur E.It will be noted that the two embodiments of the Figures 6 and 7 have the advantage of allowing the connection of the corresponding end of the exchanger E to the rest of the air conditioning circuit 1 without requiring soldering or brazing of one or more female connector (s), whose massive structure and the preliminary machining required are disadvantages known for this connection because of their weight and the overall assembly overhead they represent for the exchanger E.

Claims (12)

  1. Internal heat exchanger (E) of the coaxial tubular type for a motor vehicle air-conditioning circuit (1) comprising two, low-pressure and high-pressure (LP and HP) portions through which a coolant flows, the exchanger defining at least one radially internal passage (11) preferably for the low-pressure fluid inside an internal tube (10, 110), and a radially external passage (21) preferably for the high-pressure fluid formed between this internal tube and an external tube (20, 120), characterized in that spacer means (30, 130) of a thermal conductivity lower than that of the internal and external tubes are movably mounted at least in translation between these two tubes and extend over just a part of the length of the external passage, at least one region of this passage which is devoid of these means being intended to be connected to a tapping (40), such as a valve body or a sensor mounting nozzle, by a connecting orifice (23) formed in the external tube in line with this region.
  2. Exchanger (E) according to claim 1, characterized in that said spacer means (30, 130) are mounted in contact with the internal (10, 110) and external (20, 120) tubes so as to act as radial distance pieces between these tubes to keep them concentric.
  3. Exchanger (E) according to claim 2, of the type having at least one bent or curved section, characterized in that said spacer means (30, 130) are inserted at least at the site of this (these) section(s).
  4. Exchanger (E) according to one of the preceding claims, characterized in that said spacer means (30, 130) extend axially continuously or discontinuously over said part of the external passage (21), ending set back from at least one connecting end (22, 122) of the external tube (20, 120).
  5. Exchanger (E) according to claim 4, characterized in that said spacer means (30) are formed of a plurality of longitudinal ribs (31) connected circumferentially between their respective bases by a substantially cylindrical wall (32) capable of matching the internal tube (10, 110) so that the overall radial height of this wall and of each rib is substantially equal to that of the external passage (21).
  6. Exchanger (E) according to claim 4, characterized in that said spacer means (130) are formed of at least one spiral rib able to match the internal tube (10, 110), extending in a helix around the latter with a pitch that is either constant or variable.
  7. Exchanger (E) according to one of the preceding claims, characterized in that it incorporates said tapping (40) in line with said region of the external passage (21) devoid of said spacer means (30, 130), which region is situated near one end (22, 122) of the external tube (20, 120), this tapping being formed of a connecting nozzle of the exchanger which nozzle is intended to carry the fluid coming from or toward the external passage.
  8. Exchanger (E) according to claim 7, characterized in that the internal tube (10) at at least one of its ends has a protruding portion (12) which protrudes axially beyond the corresponding end (22) of the external tube (20) being secured to the latter end and which alone forms another connecting nozzle of the exchanger intended to carry the fluid from or toward the or each internal passage (11).
  9. Exchanger (E) according to claim 8, characterized in that said end (22) of the external tube (20) is secured to the internal tube (10) by a sinking of this end obtained for example by knurling, followed by circumferential attachment of this end to this internal tube performed for example by welding, brazing, magnetoforming or bonding.
  10. Exchanger (E) according to claim 7, characterized in that at at least one of its ends (122), the external tube (120) is secured to the internal tube (110) by crimping with previous push-fitting of one end of a flexible hose (50) for connecting to the air-conditioning circuit (1) between the respective ends (112 and 122) of these tubes (110 and 120), which hose is optionally mounted so that it butts axially against a ring flange (113) of the internal tube.
  11. Exchanger (E) according to one of claims 7 to 10, characterized in that it is devoid of any high-pressure/low-pressure female connector for connecting the internal passage(s) (11) and external passage(s) (21) to the air-conditioning circuit (1).
  12. Motor vehicle air-conditioning circuit (1), characterized in that it comprises an internal heat exchanger (E) as defined in one of the preceding claims and which is preferably connected to this circuit without any high-pressure/low-pressure female connector.
EP10194416.3A 2009-12-10 2010-12-09 Internal heat exchanger for a vehicule air conditioning circuit and such circuit Active EP2333472B1 (en)

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Applications Claiming Priority (1)

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FR0905970A FR2953917B1 (en) 2009-12-10 2009-12-10 INTERNAL THERMAL EXCHANGER FOR AIR CONDITIONING CIRCUIT OF MOTOR VEHICLE AND SUCH CIRCUIT

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EP2333472A1 EP2333472A1 (en) 2011-06-15
EP2333472B1 true EP2333472B1 (en) 2013-06-05

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EP (1) EP2333472B1 (en)
AR (1) AR079371A1 (en)
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ES (1) ES2426247T3 (en)
FR (1) FR2953917B1 (en)
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BRPI1005089B1 (en) 2020-06-23
BRPI1005089A2 (en) 2013-04-02
ES2426247T3 (en) 2013-10-22
PL2333472T3 (en) 2013-10-31
US20110139416A1 (en) 2011-06-16
FR2953917B1 (en) 2012-01-20
FR2953917A1 (en) 2011-06-17
EP2333472A1 (en) 2011-06-15

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