EP2199721A1 - Interner Wärmetauscher für einen Klimaanlagenschaltkreis eines Kraftfahrzeugs, entsprechender Schaltkreis und entsprechendes Anschlussverfahren eines Anschlusses an diesen Wärmetauscher - Google Patents

Interner Wärmetauscher für einen Klimaanlagenschaltkreis eines Kraftfahrzeugs, entsprechender Schaltkreis und entsprechendes Anschlussverfahren eines Anschlusses an diesen Wärmetauscher Download PDF

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Publication number
EP2199721A1
EP2199721A1 EP09179267A EP09179267A EP2199721A1 EP 2199721 A1 EP2199721 A1 EP 2199721A1 EP 09179267 A EP09179267 A EP 09179267A EP 09179267 A EP09179267 A EP 09179267A EP 2199721 A1 EP2199721 A1 EP 2199721A1
Authority
EP
European Patent Office
Prior art keywords
connector
sleeve
exchanger
heat exchanger
envelope
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09179267A
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English (en)
French (fr)
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EP2199721B1 (de
Inventor
Alexandre Auclair
Christophe Bernard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hutchinson SA
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Hutchinson SA
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Filing date
Publication date
Application filed by Hutchinson SA filed Critical Hutchinson SA
Publication of EP2199721A1 publication Critical patent/EP2199721A1/de
Application granted granted Critical
Publication of EP2199721B1 publication Critical patent/EP2199721B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F28F9/0251—Massive connectors, e.g. blocks; Plate-like connectors
    • F28F9/0253—Massive connectors, e.g. blocks; Plate-like connectors with multiple channels, e.g. with combined inflow and outflow channels

Definitions

  • the present invention relates to an internal heat exchanger coaxial tubular type in particular for a motor vehicle air conditioning circuit, such an air conditioning circuit incorporating this exchanger and a method of connecting a female connector high and low pressure to one at the minus the ends of 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.
  • this coaxial exchanger generally defines at least one radially internal channel defined by a sleeve and intended to convey the fluid from the high pressure portion of the circuit, and at least one radially outer channel between the sleeve and the envelope. of the exchanger and intended to convey the fluid from the portion low pressure circuit, this sleeve being usually provided with longitudinal fins distributed over its circumference.
  • a major disadvantage of these coaxial internal exchangers equipped with female connectors resides in the mutual proximity of the generated solder or solder lines which, in particular for successive solders, generate risks of reflow of the anterior solder, and also in the need to achieve these welds or brazing blind with risks of non-sealing at the junction and / or penetration of the solder in the corresponding internal or external channel may thereby cause pressure losses, pollution or plugging of these channels.
  • a major disadvantage of the coaxial internal exchangers presented in these two documents is that their assembly to a female connector requires at least two soldering operations to be performed at the same time and at least one of which relates to the connection to be made between the connector. and the inner sleeve, is necessarily "blind" or in difficult conditions because of its location inside the connector. This results in significant risks of non-compliance of the connectors and thus leakage of the transferred fluid. In addition, these brazing involve a relatively high manufacturing cost and scrap rate for the connection obtained.
  • An object of the present invention is to provide an internal heat exchanger coaxial tubular type in particular for a motor vehicle air conditioning circuit having two portions of high and low pressure respectively traversed by a refrigerant, which overcomes the aforementioned drawbacks, this exchanger defining at least one radially internal channel for the fluid issuing from the low pressure portion and, for that issuing from the high pressure portion, at least one radially outer channel formed between a tubular sleeve surrounding the internal channel (s) (s) ) and a tubular casing surrounding the external channel (s), the sleeve extending axially beyond the end of the casing by an axial length passing zone L, at least one both ends of the exchanger being equipped with a female metal connector which is sealingly assembled on and around the envelope and the sleeve and which form two fluid passageways respectively communicating with the or each internal channel and with the or each external channel.
  • an exchanger is such that the connector is assembled to the casing by a circumferential weld line for example to the arc located outside the connector and the casing, and to the sleeve by at least one annular seal which is mounted on said overflow area coaxially with the weld line and which seals under an inner axial surface of the connector, the seal or that of the gaskets - or proximal seal - which is closest to this weld line by being separated by an axial distance D preferably at least equal to 1 cm, so as not to be altered by welding.
  • annular weld line is meant generally in the present description an annular weld zone of variable axial thickness and which may be continuous or not, for example a “multiline” type zone such as a doubled line.
  • the material that can be used to produce this exchanger may for example be, in the case where the refrigerant used is carbon dioxide, R134a or the like, a metal material made of an aluminum base alloy or steel or well, in the case of the use of another refrigerant, a suitable plastic material.
  • the assembly according to the invention which may advantageously comprise only two lines of high and low pressure sealed connector / heat exchanger respectively formed, on the one hand, from the internal seal to the connector sealingly separating the high and low pressure fluids and, on the other hand, the external welding line separating these fluids from the outside atmosphere, is thus achieved in a single welding operation, which represents an assembly cost and a scrap rate. more reduced than in the prior art where two or even three welding / soldering operations were required.
  • the interior of the connector is devoid of any permanent junction with the sleeve made by heat input, such as welding or brazing, because the only welding performed l 'is outside the connector.
  • the weld line of the assembly according to the invention may advantageously join an outer radial edge of the connector to the axial outer face of the envelope.
  • an arc welding ie carried out by fusion, the heat being produced by at least one electric arc springing between one or more electrodes and the parts to be welded, or between electrodes
  • a MIG for "Metal Inert Gas” in English, made under protection of inert gas with a fuse-wire electrode which contributes to fill the weld
  • TIG for " Tungsten Inert Gas "in English, also in an internal atmosphere but with a tungsten electrode
  • this Arc welding can advantageously be carried out at a relatively reduced temperature (below 650 ° C.) and with a very brief welding cycle (less than 10 seconds), which allows the prior positioning of a seal, such as an elastomeric O-ring, near the location chosen for this welding.
  • said axial distance D between this weld line and the proximal seal may be between 1.5 cm and 5 cm, preferably being greater than the length L of said overflow zone.
  • said or each seal can be housed in a groove of said sleeve by being compressed by said inner axial surface of the connector.
  • a single seal is interposed radially between the inner surface of the connector and this groove, which is formed at said end of the sleeve.
  • the inner surface of the connector may comprise a first axial portion mounted in contact with the casing and a second axial portion mounted in contact with said overflow zone of the sleeve, said conduit of the connector which communicates with the or each external channel opening through preferably obliquely at the end of the envelope while the other conduit can coaxially extend the sleeve.
  • the exchanger according to the invention may be provided on its circumference with longitudinal fins which extend radially inside the envelope and axially behind the end of the latter, so that the space of the external channel axially between these fins and the envelope end forms, in connection with said high pressure conduit, an annular chamber collecting the flow of the fluid.
  • longitudinal fins which extend radially inside the envelope and axially behind the end of the latter, so that the space of the external channel axially between these fins and the envelope end forms, in connection with said high pressure conduit, an annular chamber collecting the flow of the fluid.
  • An air conditioning circuit for a motor vehicle comprises an internal heat exchanger as defined above.
  • the air conditioning circuit according to the invention can operate in the usual ranges of temperature and pressure relative to the refrigerant used, ie for example at pressures ranging from several tens of bars to approximately 150 bars. for carbon dioxide or R134a.
  • this welding is carried out exclusively on the outer periphery of the connector and the exchanger, for example by joining an outer radial edge of the connector to the axial outer face of the envelope.
  • MIG or TIG welding is used in step c), the welding temperature preferably being between 600 and 640 ° C.
  • the arc welding that can be used in the invention allows a shorter welding cycle than other modes of joining by thermal input, such as soldering, and that this external arc welding makes it possible, in addition to to improve the reliability of the connector / exchanger junction, to minimize the propagation of heat in the mass of the connector and therefore towards the or each gasket, in combination with the choice of a connector having a high thermal inertia.
  • the connector is advantageously based on a metal or metal alloy of high heat capacity, such as an aluminum-based material.
  • 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 carbon dioxide or R134a, without limitation. All these elements are interconnected by rigid or flexible lines constituted by rigid and / or flexible tubular portions, which have at each of their ends sealed connection means.
  • the exchanger E, E ' according to the exemplary embodiments of the invention illustrated in FIGS. figures 2 and 3 is of coaxial type against the current, and is intended to cool the fluid from the line HP by conduction in contact with the same fluid from the BP line which is heated in exchange.
  • this exchanger E, E ' is in this example constituted by a radially inner metal sleeve 10, 110 which delimits in its internal space an internal channel 11, 111 for the fluid coming from the line BP and which is inserted axially inside a radially outer envelope 20, 120 also metal delimiting with the sleeve 10, 110 an external channel 21, 121 of annular cross section for the fluid from the line HP.
  • This sleeve 10, 110 extends axially beyond the end of the casing 20, 120 by a protruding zone 13, 113 of axial length L terminating in a circumferential groove 14, 114, into which a liner is inserted.
  • the sleeve 10, 110 is provided on its circumference with a plurality of longitudinal fins 12 (visible at the figure 2 in perspective, and in section only for the lower fin 12) which extend radially inside the casing 20, 120 and terminate axially recessed from the end of the latter, so that the space of the external channel 21, 121 axially between the fins 12 and this end of the 20, 120 envelope forms a collector annular chamber of the flow of the refrigerant.
  • a female connector 30, 130 which defines two passage ducts 31, 131 and 32, 132 for the refrigerant communicating in a sealed manner with the internal channel 11, 111 and the external channel 21, 121, respectively (this duct 32, 132 has an oblique section 32a, 132a opening on the outer channel 21, 121 and extending by an axial section 32b, 132b opening out of the connector 30, 130).
  • the connector 30, 130 is mounted in contact with the radially outer face of the casing 20, 120 by another axial portion 35, 135 of its inner surface which makes a right angle with the outer edge 33, 133 of the connector weld 30, 130.
  • This arc welding is preferably carried out using the MIG technique, it being specified that TIG welding can also be used.
  • This produces a reliable weld 15, 115 (the resulting line can for example extend over an axial width of between 6 mm and 8 mm), while being performed at a sufficiently low temperature (advantageously of the order of 620 ° C.) and for a sufficiently short cycle time (less than 10 seconds) for not deteriorating the elastomeric material of the liner 15, 115.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
EP09179267A 2008-12-17 2009-12-15 Interner Wärmetauscher für einen Klimaanlagenschaltkreis eines Kraftfahrzeugs, entsprechender Schaltkreis und entsprechendes Anschlussverfahren eines Anschlusses an diesen Wärmetauscher Active EP2199721B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0807093A FR2939878B1 (fr) 2008-12-17 2008-12-17 Echangeur thermique interne pour circuit de climatisation de vehicule automobile, un tel circuit et procede de raccordement d'un connecteur a cet echangeur

Publications (2)

Publication Number Publication Date
EP2199721A1 true EP2199721A1 (de) 2010-06-23
EP2199721B1 EP2199721B1 (de) 2011-08-17

Family

ID=40873377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09179267A Active EP2199721B1 (de) 2008-12-17 2009-12-15 Interner Wärmetauscher für einen Klimaanlagenschaltkreis eines Kraftfahrzeugs, entsprechender Schaltkreis und entsprechendes Anschlussverfahren eines Anschlusses an diesen Wärmetauscher

Country Status (6)

Country Link
EP (1) EP2199721B1 (de)
AR (1) AR074769A1 (de)
AT (1) ATE520945T1 (de)
BR (1) BRPI0906281B1 (de)
ES (1) ES2372798T3 (de)
FR (1) FR2939878B1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20110392A1 (it) * 2011-05-03 2012-11-04 Dytech Dynamic Fluid Tech Spa Scambiatore di calore preferibilmente per un circuito di un veicolo
US20130146262A1 (en) * 2011-12-12 2013-06-13 Hs R & A Co., Ltd. Double pipe heat exchanger having multi-directional connector and air conditioner for vehicle including the same
EP2706321A3 (de) * 2012-09-05 2014-08-27 Hs R & A Co., Ltd. Doppelrohr zum Wärmeaustausch
CN106288925A (zh) * 2015-06-06 2017-01-04 刘福贵 同轴心套装圆筒壁端部翻边圆孔的连通方法
JP2020094793A (ja) * 2018-12-05 2020-06-18 株式会社デンソーエアシステムズ 内部熱交換器及び内部熱交換器を備える冷凍サイクル装置
EP3848660A1 (de) 2020-01-09 2021-07-14 Hutchinson Dichter anschluss eines verbindungsstücks an einen koaxialen röhrenwärmetauscher
DE102021212182A1 (de) 2021-10-28 2023-05-04 Contitech Techno-Chemie Gmbh Verfahren zur Herstellung eines Wärmetauschers und Wärmetauscher

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2085574A (en) * 1980-10-10 1982-04-28 Sueddeutsche Kuehler Behr Double pipe cooler
EP1128120A2 (de) * 2000-02-24 2001-08-29 Calsonic Kansei Corporation Verbindung für Doppelwandröhren, Verfahren zum Hartlöten der Verbindung an Doppelwandröhren, und Klimaanlage für Fahrzeuge
DE20022757U1 (de) * 2000-10-25 2002-02-28 Eaton Fluid Power Gmbh Klimaanlage mit innerem Wärmetauscher und Wärmetauscherrohr für einen solchen
DE102007054732A1 (de) * 2006-11-14 2008-07-03 Behr Kirchberg Gmbh Anschlussanordnung, insbesondere für einen Wärmetauscher

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2085574A (en) * 1980-10-10 1982-04-28 Sueddeutsche Kuehler Behr Double pipe cooler
EP1128120A2 (de) * 2000-02-24 2001-08-29 Calsonic Kansei Corporation Verbindung für Doppelwandröhren, Verfahren zum Hartlöten der Verbindung an Doppelwandröhren, und Klimaanlage für Fahrzeuge
DE20022757U1 (de) * 2000-10-25 2002-02-28 Eaton Fluid Power Gmbh Klimaanlage mit innerem Wärmetauscher und Wärmetauscherrohr für einen solchen
DE102007054732A1 (de) * 2006-11-14 2008-07-03 Behr Kirchberg Gmbh Anschlussanordnung, insbesondere für einen Wärmetauscher

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20110392A1 (it) * 2011-05-03 2012-11-04 Dytech Dynamic Fluid Tech Spa Scambiatore di calore preferibilmente per un circuito di un veicolo
EP2520888A1 (de) * 2011-05-03 2012-11-07 DYTECH - Dynamic Fluid Technologies S.p.A. Wärmetauscher
US20130146262A1 (en) * 2011-12-12 2013-06-13 Hs R & A Co., Ltd. Double pipe heat exchanger having multi-directional connector and air conditioner for vehicle including the same
EP2706321A3 (de) * 2012-09-05 2014-08-27 Hs R & A Co., Ltd. Doppelrohr zum Wärmeaustausch
US9513061B2 (en) 2012-09-05 2016-12-06 Hs R & A Co., Ltd. Dual pipe for heat exchange
CN106288925A (zh) * 2015-06-06 2017-01-04 刘福贵 同轴心套装圆筒壁端部翻边圆孔的连通方法
CN106288925B (zh) * 2015-06-06 2018-05-22 刘福贵 同轴心套装圆筒壁端部翻边圆孔的连通方法
JP2020094793A (ja) * 2018-12-05 2020-06-18 株式会社デンソーエアシステムズ 内部熱交換器及び内部熱交換器を備える冷凍サイクル装置
EP3848660A1 (de) 2020-01-09 2021-07-14 Hutchinson Dichter anschluss eines verbindungsstücks an einen koaxialen röhrenwärmetauscher
FR3106201A1 (fr) 2020-01-09 2021-07-16 Hutchinson Raccordement etanche d’un connecteur a un echangeur thermique tubulaire coaxial
US11365939B2 (en) 2020-01-09 2022-06-21 Hutchinson Sealed connection of a connector to a coaxial tubular heat exchanger
DE102021212182A1 (de) 2021-10-28 2023-05-04 Contitech Techno-Chemie Gmbh Verfahren zur Herstellung eines Wärmetauschers und Wärmetauscher

Also Published As

Publication number Publication date
BRPI0906281A2 (pt) 2011-06-21
FR2939878A1 (fr) 2010-06-18
AR074769A1 (es) 2011-02-09
ATE520945T1 (de) 2011-09-15
BRPI0906281B1 (pt) 2019-10-15
EP2199721B1 (de) 2011-08-17
FR2939878B1 (fr) 2011-02-04
ES2372798T3 (es) 2012-01-26

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