EP2333472B1 - Innerer wärmetauscher für einen kraftfahrzeugklimaanlagekreislauf und entsprechender kreislauf - Google Patents

Innerer wärmetauscher für einen kraftfahrzeugklimaanlagekreislauf und entsprechender kreislauf 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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English (en)
French (fr)
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EP2333472A1 (de
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/pl
Publication of EP2333472A1 publication Critical patent/EP2333472A1/de
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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)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air-Conditioning For Vehicles (AREA)

Claims (12)

  1. Interner Wärmeaustauscher (E) vom koaxialen, röhrenartigen Typ für einen Klimatisierungskreislauf (1) eines Kraftfahrzeugs mit zwei Abschnitten für Nieder- und Hochdruck (BP und HP), welche von einem Kältemittel durchlaufen werden, wobei der Austauscher wenigstens einen radial inneren Kanal (11), vorzugsweise für das Niederdruckfluid, im Inneren eines inneren Rohrs (10, 110) und einen radial äußeren Kanal (21), bevorzugt für das Hochdruckfluid, welcher zwischen diesem inneren Rohr und einem äußeren Rohr (20, 120) ausgebildet ist, definiert, dadurch gekennzeichnet, dass Abstandhaltemittel (30, 130) mit einer geringeren Wärmeleitfähigkeit als diejenige des inneren und äußeren Rohrs wenigstens in Translation beweglich zwischen diesen zwei Rohren angebracht sind und sich über einen Abschnitt mit nur der Länge des äußeren Kanals erstrecken, wobei wenigstens ein Bereich des letzteren ohne diese Mittel dazu bestimmt ist, an einer Abzweigung (40), wie z.B. einem Ventilkörper oder einem Stutzen eines Sensors, angebracht zu werden über eine Anschlussöffnung (23), welche in dem äußeren Rohr direkt unter diesem Bereich ausgebildet ist.
  2. Austauscher (E) nach Anspruch 1, dadurch gekennzeichnet, dass diese Abstandhaltemittel (30, 130) in Kontakt mit dem inneren (10, 110) und äußeren (20, 120) Rohr derart angebracht sind, dass sie als radiale Abstandhalter zwischen diesen Rohren dienen, um ihre Konzentrizität zu gewährleisten.
  3. Austauscher (E) nach Anspruch 2, vom Typ mit wenigstens einem gebogenen oder gewölbten Abschnitt, dadurch gekennzeichnet, dass die Abstandhaltemittel (30, 130) wenigstens am Ort dieses Abschnitts bzw. dieser Abschnitte eingesetzt sind.
  4. Austauscher (E) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Abstandhaltemittel (30, 130) sich axial auf durchgängige oder nicht durchgängige Weise über den Teil des äußeren Kanals (21) erstrecken und hinter dem wenigstens einen Anschlussende (22, 122) des äußeren Rohrs (20, 120) enden.
  5. Austauscher (E) nach Anspruch 4, dadurch gekennzeichnet, dass die Abstandhaltemittel (30) gebildet sind durch mehrere longitudinale Rippen (31), welche in der Umfangsrichtung zwischen ihren jeweiligen Basen durch eine im Wesentlichen zylindrische Wand (32) verbunden sind, welche dazu ausgestaltet ist, das innere Rohr (10, 110) derart zu umgeben, dass die gesamte radiale Höhe dieser Wand und jeder Rippe im Wesentlichen gleich zu derjenigen des äußeren Kanals (21) sind.
  6. Austauscher (E) nach Anspruch 4, dadurch gekennzeichnet, dass die Abstandhaltemittel (130) gebildet sind durch wenigstens eine spiralförmige Rippe, welche dazu ausgestaltet ist, das innere Rohr (10, 110) zu umgeben, wobei sie sich helixartig mit einer konstanten oder variablen Ganghöhe um das letztere erstreckt.
  7. Austauscher (E) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass er die Abzweigung (40) direkt unter dem Bereich des äußeren Kanals (21) ohne die Abstandhaltemittel (30, 130) beinhaltet, welcher sich in der Nähe eines Endes (22, 122) des äußeren Rohrs (20, 120) befindet, wobei diese Abzweigung gebildet ist durch einen Anschlussstutzen des Austauschers, welcher dazu bestimmt ist, das Fluid aus dem oder zu dem äußeren Kanal zu befördern.
  8. Austauscher (E) nach Anspruch 7, dadurch gekennzeichnet, dass das innere Rohr (10) wenigstens an einem seiner Enden einen Überstandabschnitt (12) aufweist, welcher axial das entsprechende Ende (22) des äußeren Rohrs (20) überragt und an diesem letzteren Ende befestigt ist, und welcher an ihm bloß einen weiteren Anschlussstutzen des Austauschers ausbildet, welcher dazu bestimmt ist, das Fluid aus oder zu dem oder jedem inneren Kanal (11) zu befördern.
  9. Austauscher (E) nach Anspruch 8, dadurch gekennzeichnet, dass das Ende (22) des äußeren Rohrs (20) an dem inneren Rohr (10) befestigt ist durch eine Einschnürung dieses Endes beispielsweise erhalten durch Rändeln, gefolgt von einer Umfangsbefestigung dieses Endes an diesem inneren Rohr, beispielsweise unter Verwendung von Schweißen, Löten, Magnetformung oder Kleben.
  10. Austauscher (E) nach Anspruch 7, dadurch gekennzeichnet, dass an wenigstens einem seiner Enden (122) das äußere Rohr (20) an dem inneren Rohr (110) befestigt ist durch Bördeln mit vorab Einpassen zwischen den jeweiligen Enden (112 und 122) dieser Rohre (110 und 120) eines Endes eines flexiblen Schlauchs (50) zum Anschluss an den Klimatisierungskreislauf (1), wobei der Schlauch optional im axialen Anschlag an einem Kragen (113) des inneren Rohrs angebracht ist.
  11. Austauscher (E) nach einem der Ansprüche 7-10, dadurch gekennzeichnet, dass er ohne jeglichen weiblichen Hochdruck-/ Niederdruck-Verbinder für den Anschluss des/der inneren (11) und äußeren (21) Kanals bzw. Kanäle an den Klimatisierungskreislauf (1) ist.
  12. Klimatisierungskreislauf (1) für ein Kraftfahrzeug, dadurch gekennzeichnet, dass er einen internen Wärmeaustauscher (E) wie in einem der vorhergehenden Ansprüche definiert umfasst, welcher bevorzugt an diesem Kreislauf ohne weiblichen Hochdruck-/Niederdruck-Verbinder angeschlossen ist.
EP10194416.3A 2009-12-10 2010-12-09 Innerer wärmetauscher für einen kraftfahrzeugklimaanlagekreislauf und entsprechender kreislauf Active EP2333472B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10194416T PL2333472T3 (pl) 2009-12-10 2010-12-09 Wewnętrzny wymiennik ciepła do obwodu klimatyzacji pojazdu samochodowego oraz taki obwód

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0905970A FR2953917B1 (fr) 2009-12-10 2009-12-10 Echangeur thermique interne pour circuit de climatisation de vehicule automobile et un tel circuit

Publications (2)

Publication Number Publication Date
EP2333472A1 EP2333472A1 (de) 2011-06-15
EP2333472B1 true EP2333472B1 (de) 2013-06-05

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Country Status (7)

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US (1) US20110139416A1 (de)
EP (1) EP2333472B1 (de)
AR (1) AR079371A1 (de)
BR (1) BRPI1005089B1 (de)
ES (1) ES2426247T3 (de)
FR (1) FR2953917B1 (de)
PL (1) PL2333472T3 (de)

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ES2426247T3 (es) 2013-10-22
FR2953917B1 (fr) 2012-01-20
PL2333472T3 (pl) 2013-10-31
EP2333472A1 (de) 2011-06-15
AR079371A1 (es) 2012-01-18
BRPI1005089B1 (pt) 2020-06-23
BRPI1005089A2 (pt) 2013-04-02
US20110139416A1 (en) 2011-06-16
FR2953917A1 (fr) 2011-06-17

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