EP1992892B1 - Accumulator for an air-conditioning circuit of the type with an internal heat exchanger and circuit including same - Google Patents

Accumulator for an air-conditioning circuit of the type with an internal heat exchanger and circuit including same Download PDF

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Publication number
EP1992892B1
EP1992892B1 EP08290444.2A EP08290444A EP1992892B1 EP 1992892 B1 EP1992892 B1 EP 1992892B1 EP 08290444 A EP08290444 A EP 08290444A EP 1992892 B1 EP1992892 B1 EP 1992892B1
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EP
European Patent Office
Prior art keywords
accumulator
high pressure
pressure duct
low pressure
fins
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EP08290444.2A
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German (de)
French (fr)
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EP1992892A1 (en
Inventor
Benoît Prian
Anthony Garcia
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Hutchinson SA
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Hutchinson SA
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Classifications

    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006—Accumulators
    • 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
    • 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
    • F28D7/0008—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 for one medium being in heat conductive contact with the conduits for the other medium
    • F28D7/0016—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 for one medium being in heat conductive contact with the conduits for the other medium the conduits for one medium or the conduits for both media being bent
    • 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
    • F28F1/24—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 transversely
    • F28F1/32—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 transversely the means having portions engaging further tubular elements
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/05—Compression system with heat exchange between particular parts of the system
    • F25B2400/051—Compression system with heat exchange between particular parts of the system between the accumulator and another part of the cycle
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/18—Optimization, e.g. high integration of refrigeration components
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/003—Filters

Definitions

  • the present invention relates to an accumulator for an air conditioning circuit comprising an internal heat exchanger, and such a circuit incorporating this accumulator, in particular for a motor vehicle.
  • the invention applies in particular but not exclusively to an air conditioning circuit using carbon dioxide as a refrigerant.
  • such an air conditioning circuit with an internal heat exchanger also comprises in particular a compressor, a cooler or condenser from which the high pressure portion to be cooled, an evaporator from which the low pressure portion is heated in the exchanger and a accumulator which is mounted between the evaporator and the compressor and which is essentially designed to separate the liquid and gaseous phase of the refrigerant by preventing the return of the latter in the liquid state to the compressor, via a deflector that includes the accumulator in its upper part.
  • This accumulator is usually provided with a desiccant system in its lower part, to protect the various components of the air conditioning system from moisture.
  • This desiccant system generally consists of a relatively bulky bag or cartridge which contains a desiccant salt and which is manually raised to bottom of the accumulator via a fastening means, such as a clamp, able to keep the desiccant system in place in use.
  • a major disadvantage of the accumulators described in these two documents resides in particular in the length and large size of the coil used for the high pressure pipe, as well as in the constraint inherent in the manual fixing of the aforementioned desiccant system in a small space located at the bottom. of the accumulator.
  • An object of the present invention is to provide an accumulator for an air conditioning circuit intended to be mounted between an evaporator and a compressor of said circuit, this accumulator incorporating a deflector, a desiccant system and an internal heat exchanger which comprises two pipes respectively of high and low pressure intended to be traversed by a refrigerant of said circuit and arranged around a longitudinal axis of symmetry of the accumulator, which allows to overcome the aforementioned drawbacks.
  • an accumulator is such that said exchanger further comprises a stack of fins for cooling the fluid flowing in said high pressure pipe via the low-pressure fluid contained in the accumulator, these fins being stacked on the along the accumulator substantially perpendicular to said axis and supporting, on the one hand, said desiccant system and, secondly, at least said high pressure pipe around said axis (which is thus mounted in contact with the fins).
  • this stack of fins also makes it possible to improve the exchange surface in this exchanger, so as to optimize the cooling of the fluid flowing in the high-pressure pipe.
  • These fins are made of a material of high thermal conductivity, preferably a metallic material such as aluminum, without limitation.
  • said stack may have an axial channel substantially centered on said axis, advantageously obtained via a piercing of orifices opposite in the fins, in which channel is mounted a drying container containing a desiccant (this container may be formed of a conduit in which is housed a bag or a cartridge containing the desiccant, or may be simply formed of such a bag, for example), this container having a side wall in fluid communication with the internal space of the accumulator, for example via perforations formed in this wall.
  • the stack of fins thus supports the desiccant system substantially centered on said axis.
  • this desiccation container thus equipped, which delimits the desiccant system according to the invention, can thus be indifferently a bag or a duct of cylindrical geometry (advantageously of circular section) or prismatic (for example of square section).
  • said desiccation container is formed of a duct mounted integral with said deflector, which may in this case advantageously be formed in one piece with the latter.
  • the "desiccant" deflector thus obtained makes it possible to group together in one and the same component the two main functions of an accumulator, thereby eliminating an article reference and further simplifying the assembly of the desiccant system inside the accumulator. which reduces the overall cost of manufacturing the accumulator.
  • the desiccant system of an accumulator according to the present invention could also be dissociated (i.e. separately mounted) from the deflector equipping it in its upper part.
  • said stack may have at least two axial channels which are formed through said fins and about said axis being two by two interconnected by a bend, and in which is mounted the high pressure line in contact with these fins.
  • this high-pressure pipe may have a lower bend which is adjacent to a bottom wall of the accumulator and which is located immediately above a lower bend of the low-pressure pipe, so that part of the high-pressure pipe is located at the bottom of the accumulator and is thus able to bathe in the low-pressure liquid fluid accumulated at the bottom of the accumulator, in order to optimize the aforementioned cooling of the fluid in the high-pressure pipe.
  • said low pressure pipe can be accommodated along an external lateral face of said stack, for example in two axial housings symmetrical to each other with respect to said axis and formed in this external face.
  • this configuration of the internal heat exchanger according to the invention advantageously has a small footprint inside the accumulator, in particular due to the relatively short length of the high pressure line (unlike the coils of the prior art mentioned above) and that the independence between the two high and low pressure lines makes it possible to dispense with any soldering or soldering connection unit, for example.
  • said high-pressure pipe may have substantially a U-tube shape, the low-pressure pipe being advantageously bent substantially in the form of a "J" pipe and then extending in a plane substantially perpendicular to that containing the high pressure pipeline.
  • the high-pressure pipe may substantially have a first U-shaped tubular section extending non-coplanarly by a second inverted U-shaped tubular section, which is again extended in a non-coplanar manner by a third U-shaped tubular section whose base is for example overlapped by that of the first section, the low pressure pipe can then also be bent substantially J-shaped extending for example in a plane substantially parallel to that containing portions; inlet and outlet of the high pressure pipeline.
  • said fins of said stack may have, in whole or in part, an embossed surface, microreliefs and / or axially offset or facing orifices forming ventilation flaps, so as to improve the natural convection of said fluid. at low pressure through the stack and thus to further optimize the heat exchange for cooling the fluid of the high pressure line.
  • An air conditioning circuit is in particular intended to equip a motor vehicle and comprises an accumulator which is mounted between an evaporator and a compressor of said circuit and which incorporates an internal heat exchanger.
  • this circuit is characterized in that this accumulator is as defined above.
  • the accumulator 1 according to the first example of the figure 1 is intended to be mounted between an evaporator and a compressor of an air conditioning circuit using in particular carbon dioxide as a refrigerant.
  • This accumulator 1 essentially comprises a reservoir 2 which is delimited in this example by a cylindrical side wall ending in a concave bottom, for example substantially in the form of a hemispherical cap (this bottom may nevertheless have any other geometry, such as a conical shape or same flat, non-limiting) and which is closed in its upper part by a closure cap 3 provided with orifices 4 connecting an internal heat exchanger 10 which is integrated with the accumulator 1. It will be noted that no It would not be outside the scope of the invention to provide a second closure plug at the lower end of the accumulator 1.
  • a low pressure line 17 of the exchanger 10 formed of a substantially "J" bent tube, which is mounted in a plane substantially perpendicular to that containing the high pressure line 12 and whose lower elbow 17a overlaps the bottom one; of Line 12 (are visible at figure 1 the upper outlet portion of the low pressure fluid, identified by the arrow C, and the lower elbow 17a).
  • Maintaining the deflector 5 in the accumulator 1 can be ensured by a wedging made to choose against one of the pipes 12 and 17 through the cap 3, against the inner face of the wall of the tank 2, against the stack of fins 11 or even against this plug 3.
  • the deflector assembly 5 - desiccant system 13 which is illustrated preferentially only at figure 2 is characterized in that the drying duct 13a is formed integrally with the deflector 5, being fixed to the latter in a centered manner (the deflector 5 is conventionally flattened dome or cup returned). It will be noted that this monoblock structure advantageously makes it possible to avoid the manual fixing (eg by clamping) of the desiccant system to the bottom of the accumulator 1 and thus to reduce the overall manufacturing cost of the latter.
  • FIGS 3 to 5 illustrate various embodiments of the fins 11, 11 ', 11 "used to form the stack supporting the desiccant system 13 and the high pressure line 12, in which we can see the central channel 14 for the desiccation line 13a and the two lateral channels 15 and 16 for the high-pressure pipe 12, as well as variable shapes for these fins 11, 11 ', 11 "which can be for example substantially rectangular ( Figures 3 and 4 ) or substantially oval with two semicircular portions respectively surrounding the lateral channels 15 and 16 which are interconnected by a median constriction around the central channel 14 ( figure 5 ).
  • the accumulator 101 according to the second example of the invention which is illustrated in FIGS. Figures 6 and 7 and whose internal heat exchanger 110 (housed inside a reservoir 102 closed by the plug 103) is visible in various aspects to Figures 8 to 11 , is essentially different from that of the figure 1 in that the high pressure line 112 of this exchanger 110 does not have a U-shaped tube geometry but, as is notably visible in FIGS.
  • FIG. 8 and 11 has, from its inlet (arrow D) at its fluid outlet (arrow E), a first U-shaped tubular section 112a extending non-coplanarly by a second inverted U-shaped tubular section 112b, which again extends in a non-coplanar manner by a third tubular section 112c U whose base 112d is overlapped downwardly by the elbow 112e of the first section 112a.
  • These sections 112a, 112b, 112c may be provided with assembly sleeves, such as the sleeve 112f illustrated in a non-limiting manner to the figure 6 .
  • these sections 112a, 112b, 112c are received in the stack of fins 111 via axial alignments of perforations formed through these fins 111 (four alignments in the example of Figures 6 to 11 , instead of the two alignments 15 and 16 of the figure 1 ). Note that one could provide a geometry and a different number of such perforation alignments in the fins 111 without departing from the scope of the invention.
  • the low pressure pipe 117 As for the low pressure pipe 117, it is formed of a bent tube in "J" (as in the figure 1 ) and extends according to this example in a plane substantially parallel to that containing the inlet and outlet portions of the high pressure pipe 112, overlapping from below the pipe 112 via its lower elbow 117a. It will be noted, however, that the low pressure pipe 117 could be arranged differently with respect to the pipe 112.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

La présente invention concerne un accumulateur pour circuit de climatisation comportant un échangeur thermique interne, et un tel circuit incorporant cet accumulateur, en particulier pour un véhicule automobile. L'invention s'applique notamment mais pas exclusivement à un circuit de climatisation utilisant du dioxyde de carbone à titre de fluide frigorigène.The present invention relates to an accumulator for an air conditioning circuit comprising an internal heat exchanger, and such a circuit incorporating this accumulator, in particular for a motor vehicle. The invention applies in particular but not exclusively to an air conditioning circuit using carbon dioxide as a refrigerant.

Dans certains circuits de climatisation pour véhicules automobiles, notamment ceux utilisant le dioxyde de carbone comme fluide frigorigène, 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, especially those using carbon dioxide as a refrigerant, 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 which is heated in exchange, to improve the efficiency 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 tel circuit de climatisation à échangeur thermique interne comporte en outre notamment un compresseur, un refroidisseur ou condenseur dont est issue la portion haute pression à refroidir, un évaporateur dont est issu la portion basse pression réchauffée dans l'échangeur et un accumulateur qui est monté entre l'évaporateur et le compresseur et qui est essentiellement conçu pour séparer les phases liquide et gazeuse du fluide frigorigène en empêchant le retour de ce dernier à l'état liquide vers le compresseur, via un déflecteur que comporte l'accumulateur dans sa partie supérieure.In known manner, such an air conditioning circuit with an internal heat exchanger also comprises in particular a compressor, a cooler or condenser from which the high pressure portion to be cooled, an evaporator from which the low pressure portion is heated in the exchanger and a accumulator which is mounted between the evaporator and the compressor and which is essentially designed to separate the liquid and gaseous phase of the refrigerant by preventing the return of the latter in the liquid state to the compressor, via a deflector that includes the accumulator in its upper part.

Cet accumulateur est usuellement pourvu d'un système dessicatif dans sa partie inférieure, afin de protéger de l'humidité les différents composants constituant le circuit de climatisation. Ce système dessicatif est en général constitué d'un sac ou d'une cartouche relativement encombrants qui contiennent un sel dessicatif et que l'on vient monter manuellement au fond de l'accumulateur via un moyen de fixation, tel qu'un collier de serrage, apte à le maintenir le système dessicatif en place en utilisation.This accumulator is usually provided with a desiccant system in its lower part, to protect the various components of the air conditioning system from moisture. This desiccant system generally consists of a relatively bulky bag or cartridge which contains a desiccant salt and which is manually raised to bottom of the accumulator via a fastening means, such as a clamp, able to keep the desiccant system in place in use.

Il est connu, par les documents US-B-6 463 757 et US-B-6 523 365 , d'intégrer à un tel accumulateur un échangeur thermique interne dans lequel la canalisation haute pression pour le fluide frigorigène est formée d'un serpentin qui est disposé en hélice autour de la face interne de la paroi latérale de l'accumulateur et qui n'est pas en contact avec le fluide accumulé à l'état liquide au fond de cet accumulateur. Ce serpentin permet notamment d'augmenter le temps de séjour du fluide dans l'échangeur et donc l'efficacité de ce dernier.He is known, by the documents US-B-6,463,757 and US-B-6,523,365 , to integrate in such an accumulator an internal heat exchanger in which the high pressure line for the refrigerant is formed of a coil which is arranged helically around the inner face of the side wall of the accumulator and which n ' is not in contact with the fluid accumulated in the liquid state at the bottom of this accumulator. This coil makes it possible in particular to increase the residence time of the fluid in the exchanger and therefore the efficiency of the latter.

Un inconvénient majeur des accumulateurs décrits dans ces deux documents réside notamment dans la longueur et l'encombrement importants du serpentin utilisé pour la canalisation haute pression, ainsi que dans la contrainte inhérente à la fixation manuelle du système dessicatif précité dans un espace réduit localisé au fond de l'accumulateur.A major disadvantage of the accumulators described in these two documents resides in particular in the length and large size of the coil used for the high pressure pipe, as well as in the constraint inherent in the manual fixing of the aforementioned desiccant system in a small space located at the bottom. of the accumulator.

Le document US-B-6 681 597 enseigne également d'intégrer un échangeur thermique interne dans un accumulateur pour circuit de climatisation, avec une canalisation haute pression en « U » qui est logée de manière coplanaire à l'intérieur d'une canalisation basse pression en « J » et qui est pourvue d'un empilement d'ailettes entre les deux ailes du « U », de sorte à améliorer l'efficacité de l'échange thermique en augmentant la surface d'échange, sans augmenter le temps de séjour du fluide dans l'échangeur. On notera que ce dernier document ne mentionne nullement le montage d'un système dessicatif dans cet accumulateur, et que la hauteur réduite entre la canalisation haute pression en « U » et le fond de l'accumulateur complique grandement un tel montage.The document US-B-6,681,597 also teaches the integration of an internal heat exchanger into an accumulator for an air conditioning circuit, with a high-pressure "U" pipe which is coplanarly housed inside a low-pressure "J" pipe and which is provided with a stack of fins between the two wings of the "U", so as to improve the efficiency of the heat exchange by increasing the exchange surface, without increasing the residence time of the fluid in the exchanger. Note that the latter document does not mention the mounting of a desiccant system in the accumulator, and that the reduced height between the high pressure pipe "U" and the bottom of the accumulator greatly complicates such a mounting.

Il est par ailleurs connu du document WO-A-2006/065185 de prévoir un accumulateur selon le préambule de la revendication 1 ci-jointe.It is also known from the document WO-2006/065185 to provide an accumulator according to the preamble of claim 1 attached.

Un but de la présente invention est de proposer un accumulateur pour circuit de climatisation destiné à être monté entre un évaporateur et un compresseur dudit circuit, cet accumulateur incorporant un déflecteur, un système dessicatif et un échangeur thermique interne qui comporte deux canalisations respectivement de haute et basse pression destinées à être parcourues par un fluide frigorigène dudit circuit et disposées autour d'un axe longitudinal de symétrie de l'accumulateur, qui permette de remédier aux inconvénients précités.An object of the present invention is to provide an accumulator for an air conditioning circuit intended to be mounted between an evaporator and a compressor of said circuit, this accumulator incorporating a deflector, a desiccant system and an internal heat exchanger which comprises two pipes respectively of high and low pressure intended to be traversed by a refrigerant of said circuit and arranged around a longitudinal axis of symmetry of the accumulator, which allows to overcome the aforementioned drawbacks.

A cet effet, un accumulateur selon l'invention est tel que ledit échangeur comporte en outre un empilement d'ailettes de refroidissement du fluide circulant dans ladite canalisation haute pression via le fluide à basse pression contenu dans l'accumulateur, ces ailettes étant empilées le long de l'accumulateur sensiblement perpendiculairement audit axe et supportant, d'une part, ledit système dessicatif et, d'autre part, au moins ladite canalisation haute pression autour dudit axe (laquelle est ainsi montée au contact des ailettes).For this purpose, an accumulator according to the invention is such that said exchanger further comprises a stack of fins for cooling the fluid flowing in said high pressure pipe via the low-pressure fluid contained in the accumulator, these fins being stacked on the along the accumulator substantially perpendicular to said axis and supporting, on the one hand, said desiccant system and, secondly, at least said high pressure pipe around said axis (which is thus mounted in contact with the fins).

On notera que cette incorporation du système dessicatif à l'échangeur thermique interne permet de se passer de moyen de fixation de ce système au fond de l'accumulateur et de monter ledit système de manière simple et éventuellement automatisée en le maintenant en position à l'intérieur de l'accumulateur, à la différence du montage manuel requis dans les accumulateurs connus.It will be noted that this incorporation of the desiccant system into the internal heat exchanger makes it possible to dispense with the means for fastening this system to the bottom of the accumulator and to mount said system in a simple and possibly automated manner by keeping it in position at the same time. inside the accumulator, unlike the manual mounting required in known accumulators.

On notera également que cet empilement d'ailettes permet également d'améliorer la surface d'échange dans cet échangeur, de sorte à optimiser le refroidissement du fluide circulant dans la canalisation haute pression. Ces ailettes sont réalisées en un matériau de conductibilité thermique élevée, de préférence un matériau métallique tel que de l'aluminium, à titre non limitatif.It will also be noted that this stack of fins also makes it possible to improve the exchange surface in this exchanger, so as to optimize the cooling of the fluid flowing in the high-pressure pipe. These fins are made of a material of high thermal conductivity, preferably a metallic material such as aluminum, without limitation.

Selon une autre caractéristique de l'invention, ledit empilement peut présenter un canal axial sensiblement centré sur ledit axe, avantageusement obtenu via un percement d'orifices en regard dans les ailettes, dans lequel canal est monté un conteneur de dessication contenant un agent dessicatif (ce conteneur pouvant être formé d'un conduit dans lequel est logé un sac ou une cartouche contenant l'agent dessicatif, ou bien pouvant être simplement formé d'un tel sac, par exemple), ce conteneur présentant une paroi latérale en communication fluidique avec l'espace interne de l'accumulateur, par exemple via des perforations formées dans cette paroi. Dans ce cas, l'empilement d'ailettes supporte ainsi le système dessicatif de manière sensiblement centrée sur ledit axe.According to another characteristic of the invention, said stack may have an axial channel substantially centered on said axis, advantageously obtained via a piercing of orifices opposite in the fins, in which channel is mounted a drying container containing a desiccant ( this container may be formed of a conduit in which is housed a bag or a cartridge containing the desiccant, or may be simply formed of such a bag, for example), this container having a side wall in fluid communication with the internal space of the accumulator, for example via perforations formed in this wall. In this case, the stack of fins thus supports the desiccant system substantially centered on said axis.

On notera que ce conteneur de dessication ainsi équipé, qui délimite le système dessicatif selon l'invention, peut être ainsi indifféremment un sac ou bien un conduit de géométrie cylindrique (avantageusement de section circulaire) ou prismatique (par exemple de section carrée).It will be noted that this desiccation container thus equipped, which delimits the desiccant system according to the invention, can thus be indifferently a bag or a duct of cylindrical geometry (advantageously of circular section) or prismatic (for example of square section).

Selon un mode préférentiel de réalisation de l'invention, ledit conteneur de dessication est formé d'un conduit monté solidaire dudit déflecteur, pouvant être dans ce cas avantageusement formé d'un seul tenant avec ce dernier.According to a preferred embodiment of the invention, said desiccation container is formed of a duct mounted integral with said deflector, which may in this case advantageously be formed in one piece with the latter.

Le déflecteur « dessicatif » ainsi obtenu permet ainsi de regrouper en un même composant les deux fonctions principales d'un accumulateur, en supprimant ainsi une référence d'article et en simplifiant encore le montage du système dessicatif à l'intérieur de l'accumulateur, ce qui permet de réduire le coût global de fabrication de l'accumulateur.The "desiccant" deflector thus obtained makes it possible to group together in one and the same component the two main functions of an accumulator, thereby eliminating an article reference and further simplifying the assembly of the desiccant system inside the accumulator. which reduces the overall cost of manufacturing the accumulator.

On notera toutefois que le système dessicatif d'un accumulateur selon la présente invention pourrait être également dissocié (i.e. monté séparément) du déflecteur l'équipant dans sa partie supérieure.It should be noted, however, that the desiccant system of an accumulator according to the present invention could also be dissociated (i.e. separately mounted) from the deflector equipping it in its upper part.

Selon une autre caractéristique de l'invention, ledit empilement peut présenter au moins deux canaux axiaux qui sont formés à travers lesdites ailettes et autour dudit axe en étant deux à deux reliés entre eux par un coude, et dans lesquels est montée la canalisation haute pression en contact avec ces ailettes.According to another characteristic of the invention, said stack may have at least two axial channels which are formed through said fins and about said axis being two by two interconnected by a bend, and in which is mounted the high pressure line in contact with these fins.

Avantageusement, cette canalisation haute pression peut présenter un coude inférieur qui est adjacent à une paroi de fond de l'accumulateur et qui est situé immédiatement au-dessus d'un coude inférieur de la canalisation basse pression, de telle sorte qu'une partie de la canalisation haute pression soit localisée au plus bas de l'accumulateur et soit ainsi apte à baigner dans le fluide liquide basse pression accumulé au fond de l'accumulateur, en vue d'optimiser le refroidissement précité du fluide dans la canalisation haute pression.Advantageously, this high-pressure pipe may have a lower bend which is adjacent to a bottom wall of the accumulator and which is located immediately above a lower bend of the low-pressure pipe, so that part of the high-pressure pipe is located at the bottom of the accumulator and is thus able to bathe in the low-pressure liquid fluid accumulated at the bottom of the accumulator, in order to optimize the aforementioned cooling of the fluid in the high-pressure pipe.

Egalement avantageusement, ladite canalisation basse pression peut être logée le long d'une face latérale externe dudit empilement, par exemple dans deux logements axiaux symétriques l'un de l'autre par rapport audit axe et formés dans cette face externe.Also advantageously, said low pressure pipe can be accommodated along an external lateral face of said stack, for example in two axial housings symmetrical to each other with respect to said axis and formed in this external face.

On notera que cette configuration de l'échangeur thermique interne selon l'invention présente avantageusement un encombrement réduit à l'intérieur de l'accumulateur, notamment grâce à la longueur relativement réduite de la canalisation haute pression (contrairement aux serpentins de l'art antérieur précité) et que l'indépendance entre les deux canalisations haute et basse pression permet de se passer de toute unité de raccordement à braser ou à souder, par exemple.Note that this configuration of the internal heat exchanger according to the invention advantageously has a small footprint inside the accumulator, in particular due to the relatively short length of the high pressure line (unlike the coils of the prior art mentioned above) and that the independence between the two high and low pressure lines makes it possible to dispense with any soldering or soldering connection unit, for example.

Selon un premier exemple de réalisation de l'invention, ladite canalisation haute pression peut présenter sensiblement une forme de tube en U, la canalisation basse pression étant avantageusement coudée sensiblement en forme de tube en « J » et s'étendant alors dans un plan sensiblement perpendiculaire à celui contenant la canalisation haute pression.According to a first exemplary embodiment of the invention, said high-pressure pipe may have substantially a U-tube shape, the low-pressure pipe being advantageously bent substantially in the form of a "J" pipe and then extending in a plane substantially perpendicular to that containing the high pressure pipeline.

Selon un second exemple de réalisation de l'invention, la canalisation haute pression peut présenter sensiblement un premier tronçon tubulaire en U se prolongeant de manière non coplanaire par un second tronçon tubulaire en U inversé, lequel se prolonge à nouveau de manière non coplanaire par un troisième tronçon tubulaire en U dont la base est par exemple chevauchée par celle du premier tronçon, la canalisation basse pression pouvant alors également être coudée sensiblement en forme de « J » en s'étendant par exemple dans un plan sensiblement parallèle à celui contenant des portions d'entrée et de sortie de la canalisation haute pression.According to a second exemplary embodiment of the invention, the high-pressure pipe may substantially have a first U-shaped tubular section extending non-coplanarly by a second inverted U-shaped tubular section, which is again extended in a non-coplanar manner by a third U-shaped tubular section whose base is for example overlapped by that of the first section, the low pressure pipe can then also be bent substantially J-shaped extending for example in a plane substantially parallel to that containing portions; inlet and outlet of the high pressure pipeline.

Par ailleurs, cette canalisation basse pression sensiblement en forme de « J » peut comporter en outre de manière connue un ou plusieurs trous, de sorte que l'huile contenue dans l'accumulateur puisse retourner vers le compresseur et circuler ainsi dans le circuit de climatisation.Furthermore, this low pressure pipe substantially shaped "J" may further comprise in a known manner one or more holes, so that the oil contained in the accumulator can return to the compressor and thus circulate in the air conditioning circuit .

On notera toutefois que la canalisation haute pression intégrée à l'accumulateur selon l'invention pourrait présenter une géométrie autre que celles en un ou plusieurs tronçons tubulaires en U précitées, pouvant par exemple être constituée d'un tube droit ou en zigzag, à titre non limitatif.It will be noted, however, that the high-pressure line integrated in the accumulator according to the invention could have a geometry other than those in one or more U-shaped tubular sections mentioned above, may for example be constituted by a straight tube or zigzag, non-limiting.

Avantageusement, lesdites ailettes de l'empilement précité peuvent présenter, en totalité ou en partie, une surface gaufrée, des microreliefs et/ou des orifices axialement décalés ou en regard formant des volets d'aération, de sorte à améliorer la convection naturelle dudit fluide à basse pression à travers l'empilement et donc à optimiser encore l'échange thermique permettant de refroidir le fluide de la canalisation haute pression.Advantageously, said fins of said stack may have, in whole or in part, an embossed surface, microreliefs and / or axially offset or facing orifices forming ventilation flaps, so as to improve the natural convection of said fluid. at low pressure through the stack and thus to further optimize the heat exchange for cooling the fluid of the high pressure line.

Un circuit de climatisation selon l'invention est en particulier destiné à équiper un véhicule automobile et comporte un accumulateur qui est monté entre un évaporateur et un compresseur dudit circuit et qui incorpore un échangeur thermique interne. Selon l'invention, ce circuit est caractérisé en ce que cet accumulateur est tel que défini ci-dessus.An air conditioning circuit according to the invention is in particular intended to equip a motor vehicle and comprises an accumulator which is mounted between an evaporator and a compressor of said circuit and which incorporates an internal heat exchanger. According to the invention, this circuit is characterized in that this accumulator is as defined above.

D'autres caractéristiques, avantages et détails de la présente invention ressortiront à la lecture de la description suivante d'un exemple de réalisation de l'invention, donné à titre illustratif et non limitatif, ladite description étant réalisée en référence avec les dessins joints, parmi lesquels :

  • la figure 1 est une vue schématique en coupe, dans un plan longitudinal médian, d'un accumulateur selon un premier exemple de l'invention intégrant un déflecteur, un échangeur thermique interne à ailettes partiellement illustré et un logement pour un système dessicatif,
  • la figure 2 est une vue schématique en coupe dans un plan longitudinal médian d'un ensemble déflecteur - système dessicatif selon un exemple préférentiel de l'invention pour l'accumulateur de la figure 1,
  • la figure 3 est une vue de dessus des ailettes de l'échangeur selon la figure 1 selon un mode de réalisation de l'invention,
  • la figure 4 est une vue de dessus des ailettes de l'échangeur selon la figure 1 selon une variante de la figure 3,
  • la figure 5 est une vue de dessus des ailettes de l'échangeur selon la figure 1 selon une autre variante de la figure 3,
  • la figure 6 est une vue en coupe selon le plan VI-VI de la figure 7 d'un accumulateur selon un second exemple de l'invention intégrant également un déflecteur, un échangeur thermique interne à ailettes et un système dessicatif,
  • la figure 7 est une vue en coupe selon le plan VII-VII de la figure 6 du même accumulateur selon ce second exemple de l'invention,
  • la figure 8 est une vue en perspective de l'accumulateur selon les figures 6 et 7,
  • les figures 9 et 10 sont des vues en coupe correspondant respectivement aux figures 6 et 7 et illustrant uniquement le montage de la canalisation haute pression de l'échangeur dans les ailettes de ce dernier, et
  • la figure 11 est une vue en perspective illustrant le montage de cette canalisation haute pression dans ces ailettes, conformément aux figures 9 et 10.
Other characteristics, advantages and details of the present invention will emerge on reading the following description of an exemplary embodiment of the invention, given by way of nonlimiting illustration, said description being made with reference to the accompanying drawings, among which :
  • the figure 1 is a diagrammatic sectional view, in a median longitudinal plane, of an accumulator according to a first example of the invention incorporating a deflector, an internally illustrated fin heat exchanger and a housing for a desiccant system,
  • the figure 2 is a schematic sectional view in a median longitudinal plane of a deflector assembly - desiccant system according to a preferred example of the invention for the accumulator of the figure 1 ,
  • the figure 3 is a top view of the fins of the exchanger according to the figure 1 according to one embodiment of the invention,
  • the figure 4 is a top view of the fins of the exchanger according to the figure 1 according to a variant of the figure 3 ,
  • the figure 5 is a top view of the fins of the exchanger according to the figure 1 according to another variant of the figure 3 ,
  • the figure 6 is a sectional view according to plane VI-VI of the figure 7 an accumulator according to a second example of the invention also incorporating a deflector, an internal heat exchanger with fins and a desiccant system,
  • the figure 7 is a sectional view along plane VII-VII of the figure 6 of the same accumulator according to this second example of the invention,
  • the figure 8 is a perspective view of the accumulator according to Figures 6 and 7 ,
  • the Figures 9 and 10 are cross-sectional views respectively corresponding to Figures 6 and 7 and illustrating only the assembly of the high pressure line of the exchanger in the fins of the latter, and
  • the figure 11 is a perspective view illustrating the mounting of this high pressure pipe in these fins, in accordance with Figures 9 and 10 .

L'accumulateur 1 selon le premier exemple de la figure 1 est destiné à être monté entre un évaporateur et un compresseur d'un circuit de climatisation utilisant notamment le dioxyde de carbone à titre de fluide frigorigène. Cet accumulateur 1 comprend essentiellement un réservoir 2 qui est délimité dans cet exemple par une paroi latérale cylindrique se terminant par un fond concave par exemple sensiblement en forme de calotte hémisphérique (ce fond pouvant néanmoins présenter toute autre géométrie, telle qu'une forme conique ou même plate, à titre non limitatif) et qui est fermé dans sa partie supérieure par un bouchon de fermeture 3 pourvu d'orifices 4 de raccordement d'un échangeur thermique interne 10 qui est intégré à cet accumulateur 1. On notera qu'on ne sortirait pas du cadre de l'invention en prévoyant un second bouchon de fermeture à l'extrémité inférieure de l'accumulateur 1.The accumulator 1 according to the first example of the figure 1 is intended to be mounted between an evaporator and a compressor of an air conditioning circuit using in particular carbon dioxide as a refrigerant. This accumulator 1 essentially comprises a reservoir 2 which is delimited in this example by a cylindrical side wall ending in a concave bottom, for example substantially in the form of a hemispherical cap (this bottom may nevertheless have any other geometry, such as a conical shape or same flat, non-limiting) and which is closed in its upper part by a closure cap 3 provided with orifices 4 connecting an internal heat exchanger 10 which is integrated with the accumulator 1. It will be noted that no It would not be outside the scope of the invention to provide a second closure plug at the lower end of the accumulator 1.

Plus précisément, l'accumulateur 1 de la figure 1 comporte de manière connue un déflecteur 5 dans sa partie supérieure qui est situé en dessous du bouchon 3 de manière adjacente à ce dernier, et qui est conçu pour séparer les phases liquide et gazeuse du fluide frigorigène du circuit de climatisation en empêchant le retour de ce fluide à l'état liquide vers le compresseur.More precisely, the accumulator 1 of the figure 1 comprises in known manner a deflector 5 in its upper part which is located below the plug 3 adjacent to the latter, and which is designed to separate the liquid and gaseous phase of the refrigerant from the refrigerant circuit. air conditioning by preventing the return of this fluid in the liquid state to the compressor.

L'échangeur thermique interne 10 comporte des ailettes 11 empilées le long du réservoir 2 perpendiculairement à son axe longitudinal de symétrie 6 et destinées à refroidir le fluide frigorigène circulant dans une canalisation haute pression 12 de l'échangeur 10 via le fluide à basse pression contenu dans l'accumulateur 1 et, selon l'invention, ces ailettes 11 supportent à la fois :

  • un système dessicatif 13 monté centré sur l'axe 6, via un canal central 14 qui est obtenu par des perforations en regard formées dans les ailettes 11 et dans lequel est monté un conduit de dessication 13a perforé contenant un agent dessicatif (non illustré, e.g. logé dans un sac ou une cartouche, ce conduit 13a étant visible à la figure 2) et communiquant avec l'espace interne de l'accumulateur 1, et
  • la canalisation haute pression 12 de l'échangeur 10 formée d'un tube en U dans l'exemple de la figure 1, dont les ailes 12a et 12b définissant des portions d'entrée et de sortie du fluide haute pression (voir flèches A et B pour l'entrée et la sortie de fluide) sont respectivement logées dans deux canaux latéraux 15 et 16 axiaux formés à travers les ailettes 11 et symétriques l'un de l'autre par rapport à l'axe 6 (et donc au canal central 14 recevant le conduit 13a) et dont le coude inférieur 12c est agencé à proximité immédiate du fond du réservoir 2, de telle sorte qu'une partie inférieure de la canalisation haute pression 12 baigne dans le fluide liquide basse pression accumulé au fond de l'accumulateur 1.
The internal heat exchanger 10 comprises fins 11 stacked along the tank 2 perpendicular to its longitudinal axis of symmetry 6 and intended to cool the refrigerant circulating in a high pressure pipe 12 of the exchanger 10 via the low pressure fluid contained in the accumulator 1 and, according to the invention, these fins 11 support at the same time:
  • a desiccant system 13 mounted centered on the axis 6, via a central channel 14 which is obtained by facing perforations formed in the fins 11 and in which is mounted a perforated drying duct 13a containing a desiccant (not shown, eg housed in a bag or a cartridge, this conduit 13a being visible at the figure 2 ) and communicating with the internal space of the accumulator 1, and
  • the high pressure line 12 of the exchanger 10 formed of a U-shaped tube in the example of the figure 1 , whose wings 12a and 12b defining inlet and outlet portions of the high pressure fluid (see arrows A and B for the inlet and the fluid outlet) are respectively housed in two axial lateral channels 15 and 16 formed through the fins 11 and symmetrical to each other with respect to the axis 6 (and therefore to the central channel 14 receiving the conduit 13a) and whose lower bend 12c is arranged in the immediate vicinity of the bottom of the tank 2, such so that a lower portion of the high pressure line 12 is immersed in the low pressure liquid fluid accumulated at the bottom of the accumulator 1.

Est en outre partiellement illustrée à la figure 1 une canalisation basse pression 17 de l'échangeur 10 formée d'un tube coudé sensiblement en « J », qui est monté dans un plan sensiblement perpendiculaire à celui contenant la canalisation haute pression 12 et dont le coude inférieur 17a vient chevaucher par le bas celui de la canalisation 12 (sont visible à la figure 1 la portion supérieure de sortie du fluide basse pression, identifiée par la flèche C, et ce coude inférieur 17a).Is also partially illustrated at the figure 1 a low pressure line 17 of the exchanger 10 formed of a substantially "J" bent tube, which is mounted in a plane substantially perpendicular to that containing the high pressure line 12 and whose lower elbow 17a overlaps the bottom one; of Line 12 (are visible at figure 1 the upper outlet portion of the low pressure fluid, identified by the arrow C, and the lower elbow 17a).

Le maintien du déflecteur 5 dans l'accumulateur 1 peut être assuré par un coincement réalisé au choix contre l'une des canalisations 12 et 17 traversant le bouchon 3, contre la face interne de la paroi du réservoir 2, contre l'empilement d'ailettes 11 ou même contre ce bouchon 3.Maintaining the deflector 5 in the accumulator 1 can be ensured by a wedging made to choose against one of the pipes 12 and 17 through the cap 3, against the inner face of the wall of the tank 2, against the stack of fins 11 or even against this plug 3.

L'ensemble déflecteur 5 - système dessicatif 13 qui est illustré à titre préférentiel seulement à la figure 2 est caractérisé par le fait que le conduit de dessication 13a est formé d'un seul tenant avec le déflecteur 5, étant solidaire de ce dernier de manière centrée (le déflecteur 5 est classiquement en forme de dôme aplati ou de coupelle retournée). On notera que cette structure monobloc permet avantageusement d'éviter la fixation manuelle (e.g. par collier de serrage) du système dessicatif au fond de l'accumulateur 1 et donc de réduire le coût global de fabrication de ce dernier.The deflector assembly 5 - desiccant system 13 which is illustrated preferentially only at figure 2 is characterized in that the drying duct 13a is formed integrally with the deflector 5, being fixed to the latter in a centered manner (the deflector 5 is conventionally flattened dome or cup returned). It will be noted that this monoblock structure advantageously makes it possible to avoid the manual fixing (eg by clamping) of the desiccant system to the bottom of the accumulator 1 and thus to reduce the overall manufacturing cost of the latter.

Les figures 3 à 5 illustrent divers modes de réalisation des ailettes 11, 11', 11" utilisées pour former l'empilement supportant le système dessicatif 13 et la canalisation haute pression 12, dans lesquelles on peut voir le canal central 14 pour le conduit de dessication 13a et les deux canaux latéraux 15 et 16 pour la canalisation haute pression 12, ainsi que des formes variables pour ces ailettes 11, 11', 11" pouvant être par exemple sensiblement rectangulaires (figures 3 et 4) ou sensiblement ovales avec deux portions hémicirculaires entourant respectivement les canaux latéraux 15 et 16 qui sont reliées entre elles par un rétrécissement médian autour du canal central 14 (figure 5).The Figures 3 to 5 illustrate various embodiments of the fins 11, 11 ', 11 "used to form the stack supporting the desiccant system 13 and the high pressure line 12, in which we can see the central channel 14 for the desiccation line 13a and the two lateral channels 15 and 16 for the high-pressure pipe 12, as well as variable shapes for these fins 11, 11 ', 11 "which can be for example substantially rectangular ( Figures 3 and 4 ) or substantially oval with two semicircular portions respectively surrounding the lateral channels 15 and 16 which are interconnected by a median constriction around the central channel 14 ( figure 5 ).

L'accumulateur 101 selon le second exemple de l'invention, qui est illustré aux figures 6 et 7 et dont l'échangeur thermique interne 110 (logé à intérieur d'un réservoir 102 fermé par le bouchon 103) est visible sous divers aspects aux figures 8 à 11, se différencie essentiellement de celui de la figure 1 en ce que la canalisation haute pression 112 de cet échangeur 110 ne présente pas une géométrie de tube en U mais, comme cela est notamment visible aux figures 8 et 11, présente de son entrée (flèche D) à sa sortie de fluide (flèche E) un premier tronçon tubulaire 112a en U se prolongeant de manière non coplanaire par un second tronçon tubulaire 112b en U inversé, lequel se prolonge à nouveau de manière non coplanaire par un troisième tronçon tubulaire 112c en U dont la base 112d est chevauchée vers le bas par le coude 112e du premier tronçon 112a. Ces tronçons 112a, 112b, 112c peuvent être munis de manchons d'assemblage, tels que le manchon 112f illustré à titre non limitatif à la figure 6.The accumulator 101 according to the second example of the invention, which is illustrated in FIGS. Figures 6 and 7 and whose internal heat exchanger 110 (housed inside a reservoir 102 closed by the plug 103) is visible in various aspects to Figures 8 to 11 , is essentially different from that of the figure 1 in that the high pressure line 112 of this exchanger 110 does not have a U-shaped tube geometry but, as is notably visible in FIGS. figures 8 and 11 has, from its inlet (arrow D) at its fluid outlet (arrow E), a first U-shaped tubular section 112a extending non-coplanarly by a second inverted U-shaped tubular section 112b, which again extends in a non-coplanar manner by a third tubular section 112c U whose base 112d is overlapped downwardly by the elbow 112e of the first section 112a. These sections 112a, 112b, 112c may be provided with assembly sleeves, such as the sleeve 112f illustrated in a non-limiting manner to the figure 6 .

A l'instar de la figure 1, ces tronçons 112a, 112b, 112c sont reçus dans l'empilement d'ailettes 111 via des alignements axiaux de perforations formés à travers ces ailettes 111 (quatre alignements dans l'exemple des figures 6 à 11, au lieu des deux alignements 15 et 16 de la figure 1). On notera que l'on pourrait prévoir une géométrie et un nombre différent de tels alignements de perforation dans les ailettes 111 sans sortir du cadre de l'invention.Like the figure 1 these sections 112a, 112b, 112c are received in the stack of fins 111 via axial alignments of perforations formed through these fins 111 (four alignments in the example of Figures 6 to 11 , instead of the two alignments 15 and 16 of the figure 1 ). Note that one could provide a geometry and a different number of such perforation alignments in the fins 111 without departing from the scope of the invention.

Quant à la canalisation basse pression 117, elle est formée d'un tube coudé en « J » (comme à la figure 1) et s'étend selon cet exemple dans un plan sensiblement parallèle à celui contenant les portions d'entrée et de sortie de la canalisation haute pression 112, en chevauchant par en dessous la canalisation 112 via son coude inférieur 117a. On notera toutefois que la canalisation basse pression 117 pourrait être agencée différemment à par rapport à la canalisation 112.As for the low pressure pipe 117, it is formed of a bent tube in "J" (as in the figure 1 ) and extends according to this example in a plane substantially parallel to that containing the inlet and outlet portions of the high pressure pipe 112, overlapping from below the pipe 112 via its lower elbow 117a. It will be noted, however, that the low pressure pipe 117 could be arranged differently with respect to the pipe 112.

Comme illustré aux figures 8 et 11, la canalisation basse pression 117 selon ce second exemple de l'invention est logée le long d'une face latérale externe 111 a de l'empilement d'ailettes 111, avantageusement au moyen de deux logements axiaux 115 et 116 symétriques l'un de l'autre par rapport à l'axe longitudinal de symétrie 106 de l'accumulateur 101 et formés dans cette face externe 111a via une paire d'encoches 111b en demi-cercle diamétralement opposées qui sont formées dans chaque ailette 111 (laquelle présente dans cet exemple un contour sensiblement circulaire), pour recevoir la canalisation basse pression 117 au sein de l'accumulateur 101.As illustrated in figures 8 and 11 , the low pressure line 117 according to this second example of the invention is housed along an external lateral face 111a of the stack of fins 111, advantageously by means of two axial housings 115 and 116 symmetrical one of the other relative to the longitudinal axis of symmetry 106 of the accumulator 101 and formed in this outer face 111a via a pair of diametrically opposed half-circle notches 111b which are formed in each fin 111 (which is present in this a substantially circular contour), to receive the low pressure line 117 within the accumulator 101.

Comme pour le premier exemple de l'invention illustré à la figure 1, on notera que cet accumulateur 101 selon l'invention intègre avantageusement avec une compacité réduite, grâce à l'empilement d'ailettes perforées 111 qu'il contient, à la fois les fonctions d'accumulateur (via le déflecteur 105 dans sa partie supérieure), de capture d'humidité (via le système dessicatif 113 à conduit perforé 113a supporté axialement au centre de cet empilement via un canal central 114 de celui-ci) et d'échangeur interne de chaleur (via notamment la canalisation haute pression 112 également supportée par cet empilement de part et d'autre du système dessicatif 113 et agencée pour plonger suffisamment dans le fluide liquide basse pression accumulé au fond de l'accumulateur 101).As for the first example of the invention illustrated in figure 1 it will be noted that this accumulator 101 according to the invention advantageously integrates with reduced compactness, thanks to the stack of perforated fins 111 that it contains, both the functions of accumulator (via the deflector 105 in its upper part ), moisture capture (via the perforated duct drying system 113a 113a supported axially in the center of this stack via a central channel 114 thereof) and internal heat exchanger (via in particular the high pressure pipe 112 also supported by this stack on both sides of the desiccant system 113 and arranged to dive sufficiently into the low pressure liquid fluid accumulated at the bottom of the accumulator 101).

Claims (12)

  1. An accumulator (1, 101) for an air-conditioning circuit intended to be mounted between an evaporator and a compressor of said circuit, this accumulator incorporating a baffle (5, 105), a dessicant system (13, 113) and an internal heat exchanger (10, 110) which includes two high and low pressure ducts (12, 112, and 17, 117) respectively intended to be covered by a refrigerant fluid of said circuit and positioned around a longitudinal axis of symmetry (6, 106) of the accumulator, characterized in that said exchanger further includes a stack of fins (11, 11', 11", 111) for cooling the fluid flowing in said high pressure duct via the low pressure fluid contained in the accumulator, these fins being stacked along the accumulator substantially perpendicularly to said axis and supporting said dessicant system on the one hand and at least said high pressure duct around said axis.
  2. The accumulator (1, 101) according to claim 1, characterized in that said stack (11, 11', 11", 111) has an axial channel (14, 114) substantially centered on said axis (6, 106) in which is mounted a drying container (13a, 113a) containing a dessicant, for example of the type housed in a bag or cartridge, said container having a side wall fluidically communicating with the internal volume of the accumulator, for example via perforations formed in this wall.
  3. The accumulator (1) according to claim 2, characterized in that said drying container (13a) is formed with a securely mounted conduit of said baffle (5).
  4. The accumulator (1, 101) according to one of the preceding claims, characterized in that said stack (11, 11', 11", 111) has at least two axial channels (15 and 16) which are formed through said fins and around said axis (6, 106) by being connected together two by two by a bend, and wherein said high pressure duct (12, 112) is mounted.
  5. The accumulator (1, 101) according to claim 4, characterized in that said high pressure duct (12, 112) has a lower bend (12c, 112e) which is adjacent to a bottom wall of the accumulator and which is immediately located above a lower bend (17a, 117a) of the low pressure duct so that a portion of said high pressure duct is immersed in the low pressure liquid fluid accumulated at the bottom of the accumulator.
  6. The accumulator (1) according to claim 5, characterized in that said high pressure duct (112) substantially is a U-shaped tube.
  7. The accumulator (101) according to claim 5, characterized in that said high pressure duct (112) substantially has a first tubular U-shaped segment (112a) extending in a non-coplanar way with a second tubular reverse U-shaped segment (112b), which again extends in a non-coplanar way with a third tubular U-shaped segment (112c), the base (112d) of which is for example overlapped by that of the first segment.
  8. The accumulator (101) according to one of the preceding claims, characterized in that said low pressure duct (117) is housed along an external side face (111a) of said stack (11, 11', 11", 111), for example in two axial housings (115 and 116) symmetrical with each other with respect to said axis (106) and formed in this external face.
  9. The accumulator (1) according to claims 6 and 8, characterized in that said low pressure duct (17) is substantially bent as a J-shaped tube and extends in a plane substantially perpendicular to the one containing said high pressure duct (12).
  10. The accumulator (101) according to claims 7 and 8, characterized in that said low pressure duct (117) is substantially bent as a J-shaped tube and extends in a plane substantially parallel to the one containing inlet and outlet portions of said high pressure duct (112).
  11. The accumulator (1, 101) according to one of the preceding claims, characterized in that said fins (11, 11', 11", 111) completely or partly have an embossed surface, microreliefs, and/or axially shifted or facing orifices forming ventilation flaps, so as to improve natural convection of said low pressure fluid through said stack.
  12. An air-conditioning circuit in particular for an automobile vehicle including an accumulator (1, 101) which is mounted between an evaporator and a compressor of said circuit and which incorporates an internal heat exchanger (10, 110), characterized in that said accumulator is such as defined according to one of the preceding claims.
EP08290444.2A 2007-05-16 2008-05-13 Accumulator for an air-conditioning circuit of the type with an internal heat exchanger and circuit including same Active EP1992892B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0703529A FR2916263B1 (en) 2007-05-16 2007-05-16 ACCUMULATOR FOR INTERNAL THERMAL EXCHANGER TYPE AIR CONDITIONING CIRCUIT AND INCORPORATING CIRCUIT

Publications (2)

Publication Number Publication Date
EP1992892A1 EP1992892A1 (en) 2008-11-19
EP1992892B1 true EP1992892B1 (en) 2016-11-02

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Application Number Title Priority Date Filing Date
EP08290444.2A Active EP1992892B1 (en) 2007-05-16 2008-05-13 Accumulator for an air-conditioning circuit of the type with an internal heat exchanger and circuit including same

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EP (1) EP1992892B1 (en)
FR (1) FR2916263B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017205410A1 (en) * 2017-03-30 2018-10-04 Robert Bosch Gmbh battery system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505393A (en) * 1945-12-28 1950-04-25 William H Garner Combined filter, drier, heat exchanger, and surge resistor for electrical refrigerators
US4313315A (en) * 1980-02-19 1982-02-02 U.S. Philips Corporation Compressor refrigeration circuits
FR2554220B1 (en) * 1983-10-28 1986-04-04 Carterot Ets APPARATUS FOR REFRIGERATION OR THERMODYNAMIC INSTALLATION
DE9303177U1 (en) * 1993-03-04 1993-04-29 Pan, Chi Chuan, Taipeh/T'ai-pei Separator for a vehicle air conditioning system
US6523365B2 (en) * 2000-12-29 2003-02-25 Visteon Global Technologies, Inc. Accumulator with internal heat exchanger
US6463757B1 (en) * 2001-05-24 2002-10-15 Halla Climate Controls Canada, Inc. Internal heat exchanger accumulator
US6681597B1 (en) * 2002-11-04 2004-01-27 Modine Manufacturing Company Integrated suction line heat exchanger and accumulator
US6904770B2 (en) * 2003-09-03 2005-06-14 Delphi Technologies, Inc. Multi-function condenser
WO2006065185A1 (en) * 2004-12-16 2006-06-22 Volvo Lastvagnar Ab Arrangement and method relating to cooling systems

Also Published As

Publication number Publication date
EP1992892A1 (en) 2008-11-19
FR2916263B1 (en) 2009-07-31
FR2916263A1 (en) 2008-11-21

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