EP0302232B1 - Flat tube for a heat exchanger - Google Patents

Flat tube for a heat exchanger Download PDF

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Publication number
EP0302232B1
EP0302232B1 EP88110537A EP88110537A EP0302232B1 EP 0302232 B1 EP0302232 B1 EP 0302232B1 EP 88110537 A EP88110537 A EP 88110537A EP 88110537 A EP88110537 A EP 88110537A EP 0302232 B1 EP0302232 B1 EP 0302232B1
Authority
EP
European Patent Office
Prior art keywords
tube
flat
metal strip
flat tube
bracing
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.)
Expired - Lifetime
Application number
EP88110537A
Other languages
German (de)
French (fr)
Other versions
EP0302232A1 (en
Inventor
Dieter Bauer
Werner Helms
Josef Kern
Gebhard Schwarz
Dietmar Zdora
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.)
Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
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
Application filed by Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP0302232A1 publication Critical patent/EP0302232A1/en
Application granted granted Critical
Publication of EP0302232B1 publication Critical patent/EP0302232B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • F28F3/046—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being linear, e.g. corrugations
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more 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
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • 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
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular 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
    • 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

Definitions

  • the invention relates to a flat tube for a heat exchanger of the type specified in the preamble of claim 1.
  • Such a flat tube is known for example from DE-C-32 16 140.
  • the flat tubes according to the prior art are soldered to the tube seam after the metal strip has been bent.
  • an integrally formed support web is provided in the known flat tube, which is supported on the opposite side of the flat tube. This support web is arranged in a lateral area of the pipe cross section.
  • a major advantage of the flat tube according to the invention is that the support web simultaneously serves as a tie rod without any additional effort, as a result of which the flat tube can also withstand high internal pressures.
  • This configuration results in two separate chambers in the flat tube, each of which is sealed off by corresponding soldering surfaces. To the outside of the tube there is a common soldering surface on the tube seam, so that each chamber of the flat tube is sealed against the outside by means of two soldering surfaces.
  • the support web acting as a tie rod has twice the thickness of the normal tube wall thickness, so that a high force load is guaranteed.
  • additional support webs extending in the longitudinal direction of the tube are provided, which are formed by inwardly directed folds of the metal strip.
  • This measure means that the flat sides of the flat tube are mutually opposed at several points in the cross section supported and the support webs soldered to the inner tube wall, so that this embodiment is suitable for extremely high loads both from the inside and from the outside.
  • the metal strip 1 shows a flat tube 2 bent from a metal strip, the cross section of which is determined by two flat sides 3 and 4 and in the lateral end regions by arches 5 and 6.
  • the two edges of the metal strip 1 are brought together on the flat side 4 and angled twice towards the flat side 3 in the same direction, so that each edge of the metal strip 1 has a support web 7, 8 and a contact surface 9, 10 on the inside of the Flat side 3 forms.
  • the two support webs 7 and 8 lie against one another and thereby form an overlapping region 14.
  • the metal strip 1 is a material that is solder-plated on one side, the solder plating being arranged on the side. which forms the outside of the flat tube 2.
  • this is an extremely flat tube which, for example, consists of a 0.4 mm thick sheet metal strip and has an outer tube dimension of 40 mm ⁇ 2 mm.
  • this information is only to be understood as an example; other material thicknesses and other cross-sectional dimensions could also be selected.
  • the flat tube it is of course possible for the flat tube to be passed through an HF welding device after the bending process, as a result of which the tube seam is tacked but not sealed. This measure can be taken in order to give the tube seam an additional strength in addition to the soldering connection which takes place later, which should however only be necessary in exceptional cases.
  • FIG. 2 shows an enlarged representation of the detail X in FIG. 1. This representation clearly shows three solder seams 11, 12, 13 which are present between the support webs 7 and 8 and between the contact surfaces 9 and 10 and the flat side 3 .
  • FIG. 3 shows a cross section through a flat tube which is configured similarly to the flat tube 2 described for FIG. 1.
  • the same reference numerals as in FIG. 1 are therefore used for matching parts.
  • the metal strip 1 is folded at two points in such a way that additional support webs 18 extend in the longitudinal direction of the tube and bear against the inside of the opposite flat side 4. If the metal strip 1 is a double-sided solder-plated material, the contact surfaces of the additional support webs 18 are also soldered to the inside of the flat tube.

Description

Flachrohr für einen WärmetauscherFlat tube for a heat exchanger

Die Erfindung bezieht sich auf ein Flachrohr für einen Wärmetauscher der im Oberbegriff des Anspruchs 1 angegebenen Gattung.The invention relates to a flat tube for a heat exchanger of the type specified in the preamble of claim 1.

Ein solches Flachrohr ist beispielsweise aus der DE-C-32 16 140 bekannt. Die Flachrohre nach dem Stand der Technik werden nach dem Biegen des Metallstreifens an der Rohrnaht zugelötet. Um das Material beim Lötvorgang in guter gegenseitiger Anlage zu halten, ist bei dem bekannten Flachrohr ein angeformter Stützsteg vorgesehen, der sich an der gegenüberliegenden Seite des Flachrohres abstützt. Dieser Stützsteg ist in einem seitlichen Bereich des Rohrquerschnittes angeordnet.Such a flat tube is known for example from DE-C-32 16 140. The flat tubes according to the prior art are soldered to the tube seam after the metal strip has been bent. In order to keep the material in good mutual contact during the soldering process, an integrally formed support web is provided in the known flat tube, which is supported on the opposite side of the flat tube. This support web is arranged in a lateral area of the pipe cross section.

Bei extrem flachen Rohren kann es jedoch vorkommen, daß aufgrund des Fluiddrucks im Rohr das sogenannte Aufbauchen _ das ist die Vergrößerung des Abstandes der Flachseiten zueinander _ auftritt. Dies kann zu Undichtheiten infolge von Rissen im Rohr führen. Zur Beseitigung dieser nachteiligen Erscheinung ist in der US-PS 2,488,615 bereits vorgeschlagen worden, das Flachrohr mit einem Einsatz auszustatten, der an beiden Flachseiten des Rohres angelötet ist. Nachteilig bei der bekannten Anordnung ist jedoch, daß zur Erhöhung der Stabilität des Flachrohres im Hinblick auf hohe Innendrücke ein zusätzliches Bauteil eingeführt und in einem zusätzlichen Arbeitsgang befestigt werden muß.In the case of extremely flat pipes, however, it can happen that due to the fluid pressure in the pipe the so-called bulging _ that is the increase in the distance between the flat sides to one another _ occurs. This can lead to leaks due to cracks in the pipe. To eliminate this disadvantageous phenomenon, it has already been proposed in US Pat. No. 2,488,615 to provide the flat tube with an insert which is soldered to both flat sides of the tube. A disadvantage of the known arrangement, however, is that an additional component is introduced to increase the stability of the flat tube with regard to high internal pressures and must be attached in an additional step.

Es ist daher die Aufgabe der vorliegenden Erfindung, ein Flachrohr gemäß dem Oberbegriff des Anspruchs 1 zu schaffen, das unabhängig von der Rohrtiefe des Flachrohres hohen Innendrücken und einer großen Druckwechselbeanspruchung standhält und bei dem keine zusätzlichen Teile und Arbeitsgänge erforderlich sind.It is therefore the object of the present invention to provide a flat tube according to the preamble of claim 1 which can withstand high internal pressures and a large pressure change stress regardless of the tube depth of the flat tube and in which no additional parts and operations are required.

Diese Aufgabe wird bei einem Flachrohr der genannten Art erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention in a flat tube of the type mentioned by the characterizing features of claim 1.

Ein wesentlicher Vorteil des erfindungsgemäßen Flachrohrs besteht darin, daß der Stützsteg ohne jeglichen Mehraufwand gleichzeitig als Zuganker dient, wodurch das Flachrohr auch hohen Innendrücken standhält. Durch diese Ausgestaltung ergeben sich in dem Flachrohr zwei separate Kammern, die jede für sich durch entsprechende Lötflächen abgedichtet sind. Zur Außenseite des Rohres ergibt sich eine gemeinsame Lötfläche an der Rohrnaht, so daß jede Kammer des Flachrohres gegen die Außenseite mittels zweier Lötflächen abgedichtet ist. Außerdem hat der als Zuganker wirkende Stützsteg die doppelte Stärke der normalen Rohrwanddicke, so daß eine hohe Kraftbeanspruchung gewährleistet ist.A major advantage of the flat tube according to the invention is that the support web simultaneously serves as a tie rod without any additional effort, as a result of which the flat tube can also withstand high internal pressures. This configuration results in two separate chambers in the flat tube, each of which is sealed off by corresponding soldering surfaces. To the outside of the tube there is a common soldering surface on the tube seam, so that each chamber of the flat tube is sealed against the outside by means of two soldering surfaces. In addition, the support web acting as a tie rod has twice the thickness of the normal tube wall thickness, so that a high force load is guaranteed.

Zur weiteren Stabilitätserhöhung des Flachrohres ist es von Vorteil, daß in Längsrichtung des Rohres verlaufende zusätzliche Stützstege vorgesehen sind, die durch nach innen gerichtete Falzungen des Metallstreifens gebildet sind. Durch diese Maßnahme werden die Flachseiten des Flachrohres an mehreren Stellen des Querschnitts gegeneinander abgestützt und die Stützstege an der Rohrinnenwand verlötet, so daß diese Ausführungsform für extrem hohe Beanspruchung sowohl von innen als auch von außen geeignet ist.To further increase the stability of the flat tube, it is advantageous that additional support webs extending in the longitudinal direction of the tube are provided, which are formed by inwardly directed folds of the metal strip. This measure means that the flat sides of the flat tube are mutually opposed at several points in the cross section supported and the support webs soldered to the inner tube wall, so that this embodiment is suitable for extremely high loads both from the inside and from the outside.

Einige Ausführungsbeispiele des erfindungsgemäßen Flachrohres sind nachstehend anhand der Zeichnung näher erläutert.Some embodiments of the flat tube according to the invention are explained in more detail below with reference to the drawing.

In der Zeichnung zeigt:

  • Fig. 1 Einen Schnitt quer zur Längsachse eines Flachrohres,
  • Fig. 2 eine vergrößerte Darstellung der Einzel-Einzelheit X in Fig. 1,
  • Fig. 3 eine Ausführungsvariante zu Fig. 1 mit zusätzlichen Stützstegen.
The drawing shows:
  • 1 shows a section transverse to the longitudinal axis of a flat tube,
  • 2 is an enlarged view of the detail X in Fig. 1,
  • Fig. 3 shows a variant of Fig. 1 with additional support webs.

In Fig. 1 ist ein aus einem Metallstreifen gebogenes Flachrohr 2 dargestellt, dessen Querschnitt durch zwei flache Seiten 3 und 4 und in den seitlichen Endbereichen durch Bögen 5 und 6 bestimmt ist. Die beiden Ränder des Metallstreifens 1 sind auf der Flachseite 4 zusammengeführt und in Richtung auf die Flachseite 3 jweils doppelt in dieselbe Richtung abgewinkelt, so daß jeder Rand des Metallstreifens 1 einen Stützsteg 7, 8 und eine Anlagefläche 9, 10 an der Innenseite der Flachseite 3 bildet. Die beiden Stützstege 7 und 8 liegen aneinander und bilden dadurch einen überlappenden Bereich 14. Bei dem Metallstreifen 1 handelt es sich um ein einseitig lotplattiertes Material, wobei die Lotplattierung auf der Seite angeordnet ist. die die Außenseite des Flachrohres 2 bildet.1 shows a flat tube 2 bent from a metal strip, the cross section of which is determined by two flat sides 3 and 4 and in the lateral end regions by arches 5 and 6. The two edges of the metal strip 1 are brought together on the flat side 4 and angled twice towards the flat side 3 in the same direction, so that each edge of the metal strip 1 has a support web 7, 8 and a contact surface 9, 10 on the inside of the Flat side 3 forms. The two support webs 7 and 8 lie against one another and thereby form an overlapping region 14. The metal strip 1 is a material that is solder-plated on one side, the solder plating being arranged on the side. which forms the outside of the flat tube 2.

Beim Löten des Wärmetauschers werden somit die Flächen der aneinanderliegenden Stützstege 7 und 8 sowie die Anlageflächen 9 und 10 an der Flachseite 3 des Flachrohres 2 verlötet.When the heat exchanger is soldered, the surfaces of the abutting support webs 7 and 8 and the contact surfaces 9 and 10 on the flat side 3 of the flat tube 2 are thus soldered.

Wie aus dieser Darstellung zu sehen ist, handelt es sich dabei um ein extrem flaches Rohr, das beispielsweise aus einem 0,4 mm dicken Blechstreifen besteht und ein Rohraußenmaß von 40 mm × 2 mm besitzt. Selbstverständlich ist diese Angabe nur als Beispiel zu verstehen, es könnten auch andere Materialstärken und andere Querschnittsdimensionen gewählt werden. Es ist selbstverständlich möglich, daß das Flachrohr nach dem Biegevorgang durch ein HF-Schweißgerät geführt wird, wodurch die Rohrnaht geheftet, jedoch nicht dichtend verschlossen wird. Diese Maßnahme kann getroffen werden, um der Rohrnaht außer der später erfolgenden Lötverbindung eine zusätzliche Festigkeit zu verleihen, was jedoch nur in Ausnahmefällen erforderlich sein dürfte.As can be seen from this illustration, this is an extremely flat tube which, for example, consists of a 0.4 mm thick sheet metal strip and has an outer tube dimension of 40 mm × 2 mm. Of course, this information is only to be understood as an example; other material thicknesses and other cross-sectional dimensions could also be selected. It is of course possible for the flat tube to be passed through an HF welding device after the bending process, as a result of which the tube seam is tacked but not sealed. This measure can be taken in order to give the tube seam an additional strength in addition to the soldering connection which takes place later, which should however only be necessary in exceptional cases.

Fig. 2 zeigt eine vergrößerte Darstellung der Einzelheit X in Fig. 1. Aus dieser Darstellung sind deutlich drei Lötnähte 11, 12, 13 ersichtlich, die zwischen den Stützstegen 7 und 8 sowie jeweils zwischen den Anlageflächen 9 und 10 und der Flachseite 3 vorhanden sind.FIG. 2 shows an enlarged representation of the detail X in FIG. 1. This representation clearly shows three solder seams 11, 12, 13 which are present between the support webs 7 and 8 and between the contact surfaces 9 and 10 and the flat side 3 .

Fig. 3 zeigt einen Querschnitt durch ein Flachrohr, das ähnlich dem zur Fig. 1 beschriebenen Flachrohr 2 ausgestaltet ist. Für übereinstimmende Teile sind daher die gleichen Bezugszeichen wie in Fig. 1 eingesetzt. Auf der Flachseite 3 des Flachrohres 2 ist das Metallband 1 an zwei Stellen derart gefalzt, daß sich in Längsrichtung des Rohres verlaufende zusätzliche Stützstege 18 ergeben, die an der Innenseite der gegenüberliegenden Flachseite 4 anliegen. Sofern es sich bei dem Metallstreifen 1 um ein doppelseitig lotplattiertes Material handelt, werden auch die Anlageflächen der zusätzlichen Stützstege 18 mit der Innenseite des Flachrohres verlötet.FIG. 3 shows a cross section through a flat tube which is configured similarly to the flat tube 2 described for FIG. 1. The same reference numerals as in FIG. 1 are therefore used for matching parts. On the flat side 3 of the flat tube 2, the metal strip 1 is folded at two points in such a way that additional support webs 18 extend in the longitudinal direction of the tube and bear against the inside of the opposite flat side 4. If the metal strip 1 is a double-sided solder-plated material, the contact surfaces of the additional support webs 18 are also soldered to the inside of the flat tube.

Claims (2)

1. A flat tube for a heat exchanger and which is formed from a metal strip (1) consisting of a bent material which is solder-plated on one side and which at least at a location which forms the tube seam has an overlapping zone (14) while in the interior of the tube, between the flat sides (3, 4) of the tube, there is extending in the longitudinal direction of the tube and formed by a correspondingly bent over part of the metal strip a bracing web (7, 8), at least one bearing surface (9, 10) of the bracing web being provided with the other side (3, 4) of the flat tube (2), characterised in that the overlapping zone (14) is formed by two parallel extending adjacently disposed bracing webs (7, 8) while as bearing surfaces (9, 10) on the adjacent tube flat side (3) each of the bracing webs (7, 8) has a rim bent over at a right-angle, the bracing webs (7, 8) and the bearing surface (9, 10) being formed by at least two edges of the metal strip (1) which are bent over twice in the same direction and which are disposed approximately in the middle of the flat sides (3, 4) and in that the metal strip (1) is solder-plated on the side forming the outside of the tube and in that one side of the bearing surface is formed by the solder-plated surface of the metal strip (1) while the flat tube (2) is soldered both in the overlapping zone (14) and also on the bearing surface (9, 10, 16).
2. A flat tube according to Claim 1, characterised in that there are extending in the longitudinal direction of the tube (2) additional bracing webs (18) which are formed by inwardly pointing folds of the metal strip (1).
EP88110537A 1987-08-01 1988-07-01 Flat tube for a heat exchanger Expired - Lifetime EP0302232B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3725602 1987-08-01
DE3725602A DE3725602A1 (en) 1987-08-01 1987-08-01 FLAT TUBE FOR A HEAT EXCHANGER

Publications (2)

Publication Number Publication Date
EP0302232A1 EP0302232A1 (en) 1989-02-08
EP0302232B1 true EP0302232B1 (en) 1991-04-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88110537A Expired - Lifetime EP0302232B1 (en) 1987-08-01 1988-07-01 Flat tube for a heat exchanger

Country Status (3)

Country Link
EP (1) EP0302232B1 (en)
DE (2) DE3725602A1 (en)
ES (1) ES2021414B3 (en)

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US6343645B1 (en) 1999-05-03 2002-02-05 Behr Gmbh & Co. Multi-chamber tube and heat exchanger arrangement for a motor vehicle
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US6513582B2 (en) 2000-07-11 2003-02-04 Delphi Technologies, Inc. Heat exchanger and fluid pipe therefor
US6530514B2 (en) 2001-06-28 2003-03-11 Outokumpu Oyj Method of manufacturing heat transfer tubes
US6615488B2 (en) 2002-02-04 2003-09-09 Delphi Technologies, Inc. Method of forming heat exchanger tube
DE102008007597A1 (en) * 2008-02-04 2009-08-06 Behr Gmbh & Co. Kg Multi-chamber flat pipe manufacturing method for heat exchanger e.g. exhaust gas heat exchanger, involves attaching bar to edge area of strip through shaping, and forming strip for forming flat pipe, such that profile is closed
CN105121988A (en) * 2013-04-10 2015-12-02 开利公司 Folded tube multiple bank heat exchange unit
US10222145B2 (en) 2010-07-16 2019-03-05 Mahle International Gmbh Solderable fluid channel for a heat exchanger of aluminum

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DE19510283A1 (en) * 1995-03-22 1996-09-26 Behr Gmbh & Co Flat tube for a soldered heat exchanger and process for its manufacture
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FR2751403B1 (en) * 1996-07-22 1998-10-09 Valeo Thermique Moteur Sa FLAT TUBE WITH COUNTER-CURRENT CIRCULATION FOR HEAT EXCHANGER
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FR2757258B1 (en) * 1996-12-12 1999-03-05 Valeo Equip Electr Moteur MULTI-CHANNEL FLAT TUBE FOR HEAT EXCHANGER
FR2765817B1 (en) * 1997-07-11 1999-09-10 Valeo Thermique Moteur Sa FOLDED TUBE FOR A HEAT EXCHANGER, ESPECIALLY A MOTOR VEHICLE
FR2769359B1 (en) 1997-10-02 1999-12-24 Valeo Thermique Moteur Sa FOLDED TUBE PROVIDED WITH INTERNAL FOLDINGS FORMING PARTITIONS FOR A HEAT EXCHANGER, ESPECIALLY A MOTOR VEHICLE
FR2771480B1 (en) * 1997-11-24 2000-02-11 Valeo Thermique Moteur Sa DUAL-CHANNEL FLAT TUBE HEAT EXCHANGER
DE19820937A1 (en) * 1998-05-09 1999-11-11 Behr Gmbh & Co Flat tube for heat exchanger in vehicle cooling system
US6591900B1 (en) * 1999-09-08 2003-07-15 Zexel Valeo Climate Control Corporation Heat exchanger, tube for heat exchanger, and method of manufacturing the heat exchanger and the tube
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DE3725602A1 (en) 1989-02-09
DE3862350D1 (en) 1991-05-16
ES2021414B3 (en) 1991-11-01
EP0302232A1 (en) 1989-02-08

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