EP0633435B1 - Verflüssiger für Klimaanlage, insbesondere in Fahrzeugen - Google Patents

Verflüssiger für Klimaanlage, insbesondere in Fahrzeugen Download PDF

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Publication number
EP0633435B1
EP0633435B1 EP19930830293 EP93830293A EP0633435B1 EP 0633435 B1 EP0633435 B1 EP 0633435B1 EP 19930830293 EP19930830293 EP 19930830293 EP 93830293 A EP93830293 A EP 93830293A EP 0633435 B1 EP0633435 B1 EP 0633435B1
Authority
EP
European Patent Office
Prior art keywords
tubes
fins
condenser
tube
oval
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.)
Revoked
Application number
EP19930830293
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English (en)
French (fr)
Other versions
EP0633435A1 (de
Inventor
Maurizio Parrino
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.)
Denso Thermal Systems SpA
Original Assignee
Magneti Marelli Climatizzazione SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8215199&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0633435(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Magneti Marelli Climatizzazione SpA filed Critical Magneti Marelli Climatizzazione SpA
Priority to ES93830293T priority Critical patent/ES2087702T3/es
Priority to EP19930830293 priority patent/EP0633435B1/de
Priority to DE1993602682 priority patent/DE69302682T2/de
Publication of EP0633435A1 publication Critical patent/EP0633435A1/de
Application granted granted Critical
Publication of EP0633435B1 publication Critical patent/EP0633435B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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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
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • 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
    • F28F1/325—Fins with openings
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F28D2021/007—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2225/00—Reinforcing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2225/00—Reinforcing means
    • F28F2225/04—Reinforcing means for 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
    • F28F2275/00—Fastening; Joining
    • F28F2275/12—Fastening; Joining by methods involving deformation of the elements
    • F28F2275/125—Fastening; Joining by methods involving deformation of the elements by bringing elements together and expanding

Definitions

  • the present invention relates to an air conditioning system, in particular for motor vehicles.
  • the invention relates to a condenser of the type defined in the preamble of the Claim.
  • the working conditions of a condenser may be rather harsh, especially in terms of operating temperature and pressure.
  • the internal pressure of the tubes, on the Freon side reaches values of more than 25 bar and temperatures of more than 120°C; when pressures of this type reach values of more than 27 - 28 bar, proposed protective systems provide for the uncoupling of the compressor from the mechanical drive and thus switch off the air conditioning system.
  • the heat exchanger network In expanded or mechanically assembled condensers, the heat exchanger network consists of round tubes, made of copper or aluminium, and of flat fins generally made of aluminium and, more rarely, of copper.
  • the tubes are inserted in the holes in the fins and are successively deformed plastically by means of a suitable expansion tool which increases the diameter of the tubes, such that the initial play between the tubes and the holes in the fin is taken up.
  • a radial interference between the tubes and fins of the order of 0.1 - 0.2 mm is obtained.
  • the final expansion of the tube is considered to be correct when, in addition to the plastic deformation of the tube, elastic deformation of the fins is obtained, such that stable and efficient contact between the two parts is ensured.
  • the characteristic components of this construction process are:
  • Braze-welded condensers are generally formed of flat tubes with internal fins made of extruded aluminium.
  • the internal fins of the tube have a structural function, that is, they prevent the collapse of the tube when subjected to high pressures.
  • the tube is folded in a serpentine configuration and corrugated or ondulated fins are inserted between each pair of adjacent limbs of the tube.
  • a special aluminium alloy which melts at a temperature which is slightly lower than the melting temperature of the aluminium parts to be connected, welds the parts placed in contact without effectively melting them.
  • the process employs a material which enables the film of aluminium oxide, which forms and would otherwise hinder the final welding of the parts, to be destroyed.
  • the temperatures used and the furnace timing, together with the cleanness of the surfaces of the parts to be welded must be controlled. This process is therefore characterised by:
  • the two techniques for producing condensers have very different features and costs; the technique is selected on the basis of the bulk, the performance and the costs of the final product.
  • the main restriction of current mechanically expanded condensers is their performance: their heat exchange performance is limited and they have a high pressure drop on the air side. When these aspects become predominant, it is then necessary to use braze-welded condensers which, even though they may be as much as 50% more expensive, enable the required level of performance to be attained with less bulk.
  • oval and flat tubes assembled with flat fins in accordance with the mechanical expansion or enlarging technique has already been proposed.
  • the use of oval tubes according to the mechanical expansion assembly technique has enabled a technique of this type to be reintroduced with remarkable results in terms of overall performance and costs.
  • this has only occurred with the change from the oval - round shape with a ratio which is less than 2.5 between the largest dimensions and the smallest dimensions of the cross-section of the tube to an oval - flat shape with a ratio which is equal to or greater than 2.5 between the largest dimensions and the smallest dimensions.
  • oval - flat tubes With a ratio of more than 2.5 between the maximum and minimum dimensions of the tube cross-section that the change in generations enabling expanded radiators to compete with braze-welded radiators in all respects was attained.
  • the oval - flat tube permits a greater development of the surface area for the exchange of heat on the tube side, together with the drop in pressure on the air side, bringing it very close to the geometry of braze-welded radiators, in which the tubes are effectively flat.
  • the object of the present invention is to provide a condenser produced according to the technique in which tubes are mechanically expanded, having improved performances and dimensions ultimately comparable to those of a braze-welded condenser.
  • the ends of the tubes 14 projecting from the exterior of the pack of fins 16 are welded to distributors designated 18, 20, 22 and 24.
  • Figure 2 shows the distribution of the flow of refrigerant fluid inside the tubes 14.
  • the fluid in the vapour state enters the distributor 18, passes through a first group of tubes and reaches the second distributor 20 to which the tubes of a second group lead through which a flow of refrigerant fluid passes in the opposite direction to the first.
  • the flow of fluid reaches the third distributor 22 and from there it passes, by means of a third group of tubes, to an outlet distributor 24 from which refrigerant fluid in the liquid state is drawn.
  • the number of tubes in the above-mentioned three groups decreases progressively so as to take account of the reduction in volume of the refrigerant fluid as it passes from the vapour state to the liquid state.
  • the condenser according to the present invention is provided with tubas with cross-sections having an elongate oval shape. There are two possibilities for the securing of the oval tubes to the distributors 18 - 24:
  • a plate which is approximately 1 mm thick, which covers the final fin, and which is inserted before the fin pack / tube-expansion process, can be used to restrict the force on the outermost fins.
  • This plate can also be used to protect the external fins when the tubes are welded directly to the distributors using a flame.
  • the dimensional parameters critical for the dimensioning of the condenser according to the invention are the ratios b/a, b/s and p/t.
  • the parameter b/a expresses the ratio between the axes of the oval tube and provides information with respect to the geometry of the tube as it moves away from the circular shape.
  • the parameter b/s relates the major axis of the tube to its thickness, expressing the rigidity of the tube.
  • the parameter p/t expresses the ratio between the distance between the fins and their thickness. This value stresses the fundamental contribution the fins make to the structure of the condenser for withstanding the considerable pressures coming into play.
  • the tube / fin structure can withstand the extreme pressure and temperature conditions on the fluid side without undergoing permanent deformation.
  • a novel condenser is designed, of the type which is mechanically expanded and has oval tubes which have a flattened profile and are arranged in a single row, and has the following dimensions:
  • the choice of producing the single-now condenser is due to the need to reduce as far as possible the drop in pressure on the air side and thus to the need to reduce the thickness of the condenser on the air side.

Landscapes

  • 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)
  • Other Air-Conditioning Systems (AREA)

Claims (1)

  1. Verflüssiger für Klimaanlagen, besonders für Kraftfahrzeuge, wobei der Verflüssiger eine Gruppe von Rohren (14) enthält, die an einer Packung von im wesentlichen flachen Rippen (16) mit Hilfe einer mechanischen Aufweitung der Rohre (14) befestigt sind, die auf das Einsetzen der Rohre (14) in Öffnungen erfolgt, die in den Rippen (16) ausgerichtet sind, dadurch gekennzeichnet, daß die Rohre (14) einen länglichen Querschnitt ohne irgendwelche flachen Wände besitzen, wobei das Verhältnis zwischen der Maximalabmessung (b) und der Minimalabmessung (a) des Querschnitts zwischen 2,5 und 3,75 liegt, wobei das Verhältnis zwischen der Maximalabmessung (b) des Querschnitts und der Dicke (s) des Rohrs (14) zwischen 15 und 30 liegt, und wobei das Verhältnis zwischen dem Abstand zwischen den Rippen (p) und der Dicke einer jeden Rippe (t) kleiner oder gleich 11 ist.
EP19930830293 1993-07-06 1993-07-06 Verflüssiger für Klimaanlage, insbesondere in Fahrzeugen Revoked EP0633435B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES93830293T ES2087702T3 (es) 1993-07-06 1993-07-06 Condensador de sistemas de acondicionamiento de aire, en particular para vehiculos de motor.
EP19930830293 EP0633435B1 (de) 1993-07-06 1993-07-06 Verflüssiger für Klimaanlage, insbesondere in Fahrzeugen
DE1993602682 DE69302682T2 (de) 1993-07-06 1993-07-06 Verflüssiger für Klimaanlage, insbesondere in Fahrzeugen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19930830293 EP0633435B1 (de) 1993-07-06 1993-07-06 Verflüssiger für Klimaanlage, insbesondere in Fahrzeugen

Publications (2)

Publication Number Publication Date
EP0633435A1 EP0633435A1 (de) 1995-01-11
EP0633435B1 true EP0633435B1 (de) 1996-05-15

Family

ID=8215199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930830293 Revoked EP0633435B1 (de) 1993-07-06 1993-07-06 Verflüssiger für Klimaanlage, insbesondere in Fahrzeugen

Country Status (3)

Country Link
EP (1) EP0633435B1 (de)
DE (1) DE69302682T2 (de)
ES (1) ES2087702T3 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1285264B1 (it) * 1996-02-26 1998-06-03 Magneti Marelli Climat Srl Condensatore per impianti di condizionamento d'aria per veicoli.
IT1284735B1 (it) 1996-08-07 1998-05-21 Magneti Marelli Climat Srl Condensatore per impianti di condizionamento d'aria per veicoli
EP0823610A1 (de) * 1996-08-08 1998-02-11 Norsk Hydro Asa Wärmetauscher
DE69733284T2 (de) 1996-12-25 2005-10-06 Calsonic Kansei Corp. Kondensatoraufbaustruktur
WO1998053265A1 (en) 1997-05-16 1998-11-26 Norsk Hydro Asa Flat oval tube
WO2000022366A1 (en) * 1998-10-09 2000-04-20 S.C. Romradiatoare S.A. High efficiency heat exchanger with oval tubes
DE102010043000A1 (de) * 2010-10-27 2012-05-03 Behr Gmbh & Co. Kg Kraftfahrzeugklimaanlage
WO2015040746A1 (ja) 2013-09-20 2015-03-26 三菱電機株式会社 熱交換器、その熱交換器を用いた空気調和装置、及びその熱交換器の製造方法
JP7092987B2 (ja) * 2018-01-22 2022-06-29 ダイキン工業株式会社 室内熱交換器および空気調和装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2269053B1 (de) * 1974-04-25 1976-12-17 Chausson Usines Sa
FR2402850A1 (fr) * 1977-09-09 1979-04-06 Ferodo Sa Dispositif de tube a ailettes pour echangeur de chaleur, notamment pour radiateur de vehicule automobile, et son procede de fabrication
FR2462215A1 (fr) * 1979-07-26 1981-02-13 Ferodo Sa Procede de conformation d'un tube en particulier pour echangeur de chaleur et echangeur de chaleur muni de tubes ainsi conformes
IT8334024V0 (it) * 1983-05-16 1983-05-16 Zanussi A Spa Industrie Frigorifero provvisto di condensatore perfezionato.
DE3329202A1 (de) * 1983-08-12 1985-02-21 MTU Motoren- und Turbinen-Union München GmbH, 8000 München Profilrohr-waermetauscher
DE3910357A1 (de) * 1989-03-30 1990-10-04 Autokuehler Gmbh & Co Kg Leitblech fuer einen waermetauscher und daraus hergestelltes waermetauschernetz
DE3938842A1 (de) * 1989-06-06 1991-05-29 Thermal Waerme Kaelte Klima Verfluessiger fuer ein kaeltemittel einer fahrzeugklimaanlage

Also Published As

Publication number Publication date
DE69302682D1 (de) 1996-06-20
ES2087702T3 (es) 1996-07-16
DE69302682T2 (de) 1996-09-26
EP0633435A1 (de) 1995-01-11

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