EP1468234A1 - Multi-chamber flat tube - Google Patents

Multi-chamber flat tube

Info

Publication number
EP1468234A1
EP1468234A1 EP03702456A EP03702456A EP1468234A1 EP 1468234 A1 EP1468234 A1 EP 1468234A1 EP 03702456 A EP03702456 A EP 03702456A EP 03702456 A EP03702456 A EP 03702456A EP 1468234 A1 EP1468234 A1 EP 1468234A1
Authority
EP
European Patent Office
Prior art keywords
flat
tube
chamber
flat strip
webs
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
EP03702456A
Other languages
German (de)
French (fr)
Other versions
EP1468234B1 (en
Inventor
Werner Helms
Wolfgang Kramer
Florian Moldovan
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 EP1468234A1 publication Critical patent/EP1468234A1/en
Application granted granted Critical
Publication of EP1468234B1 publication Critical patent/EP1468234B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49391—Tube making or reforming

Definitions

  • the invention relates to a multi-chamber flat tube produced from a flat band and closed by a longitudinal seam.
  • a multi-chamber flat tube of this type was known from EP-A 0 457 470.
  • the known flat tube is produced from a sheet metal strip or flat strip, beads first being embossed into the flat strip, namely over its entire width, ie in both flat strip halves.
  • the beads are then formed into folded webs so that the two legs [of the webs lie closely against one another.
  • the tube is then folded approximately in the middle, so that the two halves of the band come to lie against each other, the webs being offset from one another.
  • the abutting longitudinal edges of the two halves of the band are then welded to one another by means of a longitudinal seam, so that a closed cross section is produced.
  • the tube, the strip material of which is solder-plated is soldered, so that the backs of the webs form a solder connection with the opposite tube wall.
  • so-called corrugated fins are arranged on the outside of the flat tubes and are soldered to the flat tubes.
  • the webs are not offset from one another, but are arranged opposite one another, but they only extend over half the tube thickness and meet in the middle.
  • the disadvantage of this known multi-chamber tube is that manufacturing-related tolerances in the web height can only be compensated for with difficulty, with the result that either there is no continuous solder connection between the web back and the opposite inner tube wall side or the outer dimension of the flat tube exceeds the desired dimension.
  • a longitudinal, resilient and / or deformable system is created in the tube wall on the opposite side of the web back, on which the web back is supported when the tube is calibrated.
  • the height of the expression on the inside of the tube is chosen so that it corresponds to the tolerance in the web height.
  • the embossing on the outside, ie the long side of the flat tube is so slight that the subsequent soldering process with the rib is not impaired, ie there can be a continuous solder connection between the outside of the flat tubes and the corrugated ridges of the corrugated fins.
  • the flat tube can have one or more webs which are folded from one or both long sides.
  • the longitudinal seam can be welded or soldered.
  • the width of the plateau-like shape is approximately twice to three times the tube wall thickness, ie. H. the ribbon; the height of the expression towards the inside of the tube is less than half the tube wall thickness. It is thereby achieved that the web back can be impressed into the plateau-like shape when the tube is calibrated, without there being any bulging on the outside of the long side of the flat tube.
  • the webs are arranged only on one longitudinal side of the flat tube, while only the corresponding features are provided on the other side. This enables simpler production, particularly with regard to the position of the longitudinal weld seam.
  • a method for producing a generic multi-chamber flat tube is proposed which, owing to the initially plateau-like configuration with respect to the web back, enables tolerances in the web back height and the tube wall thickness by deflection of the web back into the
  • FIG. 1 shows a welded multi-chamber tube with a web
  • FIG. 2 shows a section of the multi-chamber tube according to FIG. 1 before calibration
  • FIG. 3 shows the detail according to FIG. 2 after calibration.
  • the flat tube 1 shows a cross section through a multi-chamber flat tube 1, which is produced from a flat strip of sheet metal strip 2 and is welded to a narrow side 3 by means of a longitudinal seam 4.
  • the flat tube 1 has an elongated cross section with two longitudinal sides 5 and 6 and a further rounded narrow side 7.
  • the depth t of the flat tube is approximately 24 mm, and the thickness d is approximately 1.8 mm, so that a ratio of depth to thickness 7 13 results.
  • a web 8 is arranged, which is produced by folding the flat strip 2. It divides the flat tube 1 into two chambers 9 and 10.
  • FIG. 2 shows the detail X from FIG. 1, that is to say an enlarged section with the web 8.
  • the web 8 is produced from the flat strip material, which has a thickness of s ⁇ 0.26 mm, by a folding process.
  • the web 8 has two legs 11, 12 which are connected to one another via a web back 13. Both legs 11, 12 lie close together and the two outer bending radii 14 are chosen to be as small as possible so that the outer surface of the long side 5 remains as smooth as possible.
  • a plateau-like elevation 15 is arranged opposite the web back 13 and is pronounced from the lower longitudinal side 6 of the flat tube 1 to the inside 6 'of the tube.
  • This elevation or shape 15 has a height h toward the inside 9, 10 of the tube 1, which is approximately 0.05 mm, ie approximately 20% of the wall thickness s of the flat strip.
  • the width b of the shape 15 is approximately 1 mm, ie it corresponds approximately to four times the wall thickness s.
  • the illustration in FIG. 2 shows the multi-chamber tube 1 with a thickness d 0 in a state after the web 8 has been folded and the tube has been welded, but before the calibration process with which the exact thickness d of the flat tube 1 is produced. In so far there is a gap 16 between the web back 13 and the plateau-like elevation 15, ie the web back 13 does not rest on the shape 15.
  • Fig. 3 shows the section of the tube 1, d. H. the detail X after the so-called height calibration, d. H. after the tube has been brought to the desired dimension d 'in a roller set, not shown here.
  • the two long sides 5 and 6 - as shown by the arrows - are compressed to the dimension d 'by the roller set mentioned.
  • the ridge 13 was impressed into the plateau-like elevation 15 and formed a "dent" 17 there. This "dent" 17 therefore takes up the tolerance-related inaccuracies after calibration.
  • the multi-chamber flat tubes are then soldered to corrugated fins - as is known per se - to form a heat exchanger.
  • the strip material 2 for the multi-chamber tubes is solder-plated on both sides; insofar as soldering between the web back 13 and the shape 15 as well as between the outer sides 5, 6 and the corrugated ribs, not shown, is ensured.
  • the web 8 thus acts not only as a partition, but also as a tie rod for absorbing internal pressure forces in the tube.
  • the remaining depth e of the impression 15 or the “dent” 17 is so small that it does not impair the soldering between the corrugated fin and the outside of the tube 1, ie the solder gap which is somewhat enlarged in this area can easily filled with solder during the soldering process, so that an uninterrupted material connection between the corrugated fin and the outer wall of the tube is guaranteed.
  • the invention is also applicable to multi-chamber tubes with any number of webs or chambers. It is advantageous if the webs are arranged on one long side and the plateau-like features on the opposite long side of the multi-chamber flat tube.
  • the manufacturing process and the exact position of the longitudinal weld seam can be influenced favorably.
  • the multi-chamber pipe described above is preferably used for air-cooled coolant coolers for internal combustion engines for motor vehicles.

Landscapes

  • 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)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Tubes (AREA)

Abstract

The invention relates to a multi-chamber tube, produced from a flat sheet, welded along the longitudinal surfaces with two planar face surfaces, two curved narrow sides and webs, folded from the flat strip which divide adjacent chambers and which are soldered to the opposing tube inner wall and a method for production thereof. According to the invention, the flat strip comprises inward projections in the region of the soldering of the webs.

Description

Mehrkammerflachrohr Multi-chamber flat tube
Die Erfindung bezieht sich auf ein aus einem Flachband hergestelltes, durch eine Längsnaht geschlossenes Mehrkammerflachrohr nach dem Oberbegriff des Patentanspruches 1. Ein solches Mehrkammerflachrohr wurde durch die EP-A 0 457 470 bekannt.The invention relates to a multi-chamber flat tube produced from a flat band and closed by a longitudinal seam. A multi-chamber flat tube of this type was known from EP-A 0 457 470.
Das bekannte Flachrohr wird aus einem Blechstreifen bzw. Flachband hergestellt, wobei zunächst Sicken in das Flachband eingeprägt werden, und zwar über dessen gesamte Breite, d. h. in beide Flachbandhälften. Die Sicken werden anschließend in gefaltete Stege umgeformt, so daß die beiden Schenke[ der Stege eng aneinander anliegen. Das Rohr wird dann etwa in der Mitte gefaltet, so daß die beiden Bandhälften aneinander zu liegen kommen, wobei die Stege versetzt gegeneinander angeordnet sind. Die aneinanderstoßenden Längsränder der beiden Bandhälften werden dann mittels einer Längsnaht miteinander verschweißt, so daß ein geschlossener Querschnitt entsteht. Schließlich wird das Rohr, dessen Bandmaterial lotplatiert ist, verlötet, so daß die Rücken der Stege mit der gegenüberliegenden Rohrwand eine Lötverbindung bilden. Auf der Außenseite der Flachrohre sind sogenannte Wellrippen angeordnet, die mit den Flachrohren verlötet werden. In einer weiteren Ausführungsform der EP-A 0 457 470 sind die Stege nicht gegeneinander versetzt, sondern einander gegenüberliegend angeordnet, sie erstrecken sich allerdings nur über die Hälfte der Rohrdicke und stoßen in der Mitte aufeinander. Nachteilig bei diesem bekannten Mehrkammerrohr ist es, daß fertigungsbedingte Toleranzen in der Steghöhe nur schwer kompensiert werden können, was zur Folge hat, daß entweder keine durchgehende Lötverbindung zwischen den Stegrücken und der gegenüberliegenden Rohrinnenwandseite erfolgt oder die Außenabmessung des Flachrohres das Sollmaß überschreitet.The known flat tube is produced from a sheet metal strip or flat strip, beads first being embossed into the flat strip, namely over its entire width, ie in both flat strip halves. The beads are then formed into folded webs so that the two legs [of the webs lie closely against one another. The tube is then folded approximately in the middle, so that the two halves of the band come to lie against each other, the webs being offset from one another. The abutting longitudinal edges of the two halves of the band are then welded to one another by means of a longitudinal seam, so that a closed cross section is produced. Finally, the tube, the strip material of which is solder-plated, is soldered, so that the backs of the webs form a solder connection with the opposite tube wall. So-called corrugated fins are arranged on the outside of the flat tubes and are soldered to the flat tubes. In a further embodiment of EP-A 0 457 470, the webs are not offset from one another, but are arranged opposite one another, but they only extend over half the tube thickness and meet in the middle. The disadvantage of this known multi-chamber tube is that manufacturing-related tolerances in the web height can only be compensated for with difficulty, with the result that either there is no continuous solder connection between the web back and the opposite inner tube wall side or the outer dimension of the flat tube exceeds the desired dimension.
Bekannt sind ferner sogenannte Sickenrohre, z.B. durch die DE-A 40 26 988 oder DE-A 195 10 283 der Anmelderin. Diese Sicken weisen zwar beim Kalibrieren des Flachrohres auf Sollstärke eine gewisse Elastizität auf, so daß die fertigungsbedingten Toleranzen kompensiert werden können; aller- dings entsteht durch die Sicke auf der Außenseite des Rohres eine Lücke gegenüber den angelöteten Rippen, was eine Unterbrechung des Wärmeübergangs zur Folge hat.So-called corrugated pipes, e.g. by DE-A 40 26 988 or DE-A 195 10 283 by the applicant. These beads have a certain elasticity when calibrating the flat tube to the desired thickness, so that the manufacturing-related tolerances can be compensated; however, the bead on the outside of the tube creates a gap with the soldered fins, which leads to an interruption in the heat transfer.
Es ist daher Aufgabe der vorliegenden Erfindung, das gattungsgemäße Mehrkammerflachrohr dahingehend zu verbessern, daß die fertigungsbedingten Toleranzen auf einfache Weise ausgeglichen werden können und daß auf der Außenseite des Flachrohres ein kontinuierlicher Wärmeübergang zur angelöteten Rippe gewährleistet ist. Es ist ferner Aufgabe der Erfindung, ein Verfahren zur Herstellung eines gattungsgemäßen Flach- rohres zu schaffen, mit welchem die Fertigungstoleranzen kompensiert und ein maßhaltiges Rohr hergestellt werden kann.It is therefore an object of the present invention to improve the generic multi-chamber flat tube in such a way that the manufacturing-related tolerances can be compensated for in a simple manner and that a continuous heat transfer to the brazed fin is ensured on the outside of the flat tube. It is also an object of the invention to provide a method for producing a generic flat tube, with which the manufacturing tolerances can be compensated and a dimensionally stable tube can be produced.
Die Lösung dieser Aufgabe ergibt sich für das gattungsgemäße Mehrkammerflachrohr aus den kennzeichnenden Merkmalen des Patent- anspruches 1.This object is achieved for the generic multi-chamber flat tube from the characterizing features of patent claim 1.
Durch die Anordnung einer plateauartigen Ausprägung auf der einemBy arranging a plateau-like shape on one
Stegrücken gegenüberliegenden Längsseite des Rohres wird eine federnde und/oder verformbare Anlage in der Rohrwand geschaffen, auf der sich der Stegrücken beim Kalibrieren des Rohres abstützt. Bei einem leichten Über- maß in der Höhe des Stegrückens kann sich die Ausprägung, die vor dem Kalibrieren eben ist, nach außen verformen und so das Übermaß aufnehmen. Die Höhe der Ausprägung zur Rohrinnenseite ist so gewählt, daß sie der Toleranz in der Steghöhe entspricht. Die Einprägung auf der Außen- seite, d. h. der Längsseite des Flachrohres ist so gering, daß der spätere Lötvorgang mit der Rippe nicht beeinträchtigt wird, d. h. es kann eine durchgehende Lötverbindung zwischen der Außenseite der Flachrohre und den Wellenkämmen der Wellrippen stattfinden. Das Flachrohr kann einen oder mehrere Stege aufweisen, die aus einer oder beiden Längsseiten gefaltet sind. Die Längsnaht kann geschweißt oder gelötet sein.A longitudinal, resilient and / or deformable system is created in the tube wall on the opposite side of the web back, on which the web back is supported when the tube is calibrated. With a slight over When measured at the height of the ridge, the shape that is flat before calibration can deform outwards and thus absorb the excess. The height of the expression on the inside of the tube is chosen so that it corresponds to the tolerance in the web height. The embossing on the outside, ie the long side of the flat tube, is so slight that the subsequent soldering process with the rib is not impaired, ie there can be a continuous solder connection between the outside of the flat tubes and the corrugated ridges of the corrugated fins. The flat tube can have one or more webs which are folded from one or both long sides. The longitudinal seam can be welded or soldered.
Nach einer vorteilhaften Weiterbildung der Erfindung beträgt die Breite der plateauartigen Ausprägung etwa das doppelte bis dreifache der Rohrwandstärke, d. h. des Flachbandes; die Höhe der Ausprägung zur Innenseite des Rohres hin beträgt weniger als die Hälfte der Rohrwandstärke. Dadurch wird erreicht, daß sich der Stegrücken beim Kalibrieren des Rohres in die plateauartige Ausprägung einprägen kann, ohne daß es zu einer Auswölbung auf der Außenseite der Längsseite des Flachrohres kommt.According to an advantageous development of the invention, the width of the plateau-like shape is approximately twice to three times the tube wall thickness, ie. H. the ribbon; the height of the expression towards the inside of the tube is less than half the tube wall thickness. It is thereby achieved that the web back can be impressed into the plateau-like shape when the tube is calibrated, without there being any bulging on the outside of the long side of the flat tube.
Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung sind die Stege nur auf einer Längsseite des Flachrohres angeordnet, während auf der anderen Seite nur die korrespondierenden Ausprägungen vorgesehen sind. Dies ermöglicht eine einfachere Herstellung, insbesondere im Hinblick auf die Lage der Läπgsschweißnaht.According to a further advantageous embodiment of the invention, the webs are arranged only on one longitudinal side of the flat tube, while only the corresponding features are provided on the other side. This enables simpler production, particularly with regard to the position of the longitudinal weld seam.
Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung wird ein Verfahren zur Herstellung eines gattungsgemäßen Mehrkammerflachrohres vorgeschlagen, welches auf Grund der zunächst plateauartigen Ausprägung gegenüber dem Stegrücken ermöglicht, daß Toleranzen in der Stegrücken- höhe und der Rohrwandstärke durch ein Einfedern des Stegrückens in dieAccording to a further advantageous embodiment of the invention, a method for producing a generic multi-chamber flat tube is proposed which, owing to the initially plateau-like configuration with respect to the web back, enables tolerances in the web back height and the tube wall thickness by deflection of the web back into the
Ausprägung kompensiert werden können und somit eine dichte und feste Lötverbindung über die gesamte Rohrlänge gewährleistet wird. Dies ist insofern wichtig, weil die Stege die auf die Rohrwandung wirkenden Druckkräfte aufnehmen und als Zugaπker wirken müssen. Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im Folgenden näher beschrieben. Es zeigen:Characteristics can be compensated and thus a tight and firm solder joint is guaranteed over the entire length of the tube. This is important because the webs absorb the compressive forces acting on the pipe wall and have to act as tensioners. An embodiment of the invention is shown in the drawing and is described in more detail below. Show it:
Fig. 1 ein geschweißtes Mehrkammerrohr mit einem Steg, Fig. 2 einen Ausschnitt des Mehrkammerrohres gemäß Fig. 1 vor dem Kalibrieren und1 shows a welded multi-chamber tube with a web, FIG. 2 shows a section of the multi-chamber tube according to FIG. 1 before calibration and
Fig. 3 den Ausschnitt gemäß Fig. 2 nach dem Kalibrieren.3 shows the detail according to FIG. 2 after calibration.
Fig. 1 zeigt einen Querschnitt durch ein Mehrkammerflachrohr 1 , welches aus einem Flachbandblechstreifen 2 hergestellt und an einer Schmalseite 3 mittels einer Längsnaht 4 verschweißt ist. Das Flachrohr 1 weist einen langgestreckten Querschnitt mit zwei Längsseiten 5 und 6 und einer weiteren abgerundeten Schmalseite 7 auf. Die Tiefe t des Flachrohres beträgt etwa 24 mm, und die Dicke d etwa 1 ,8 mm, so daß sich ein Verhältnis von Tiefe zu Dicke 7 « 13 ergibt. Etwa in der Mitte des Flachrohres 1 ist ein Steg 8 angeordnet, der durch Faltung aus dem Flachband 2 hergestellt wird. Er teilt das Flachrohr 1 in zwei Kammern 9 und 10.1 shows a cross section through a multi-chamber flat tube 1, which is produced from a flat strip of sheet metal strip 2 and is welded to a narrow side 3 by means of a longitudinal seam 4. The flat tube 1 has an elongated cross section with two longitudinal sides 5 and 6 and a further rounded narrow side 7. The depth t of the flat tube is approximately 24 mm, and the thickness d is approximately 1.8 mm, so that a ratio of depth to thickness 7 13 results. Approximately in the middle of the flat tube 1, a web 8 is arranged, which is produced by folding the flat strip 2. It divides the flat tube 1 into two chambers 9 and 10.
Fig. 2 zeigt die Einzelheit X aus Fig. 1 , d. h. einen vergrößerten Ausschnitt mit dem Steg 8. Wie bereits erwähnt, wird der Steg 8 durch einen Faltvorgang aus dem Flachbandmaterial, welches eine Dicke von s « 0,26 mm aufweist, hergestellt. Der Steg 8 weist zwei Schenkel 11 , 12 auf, die über einen Stegrücken 13 miteinander verbunden sind. Beide Schenkel 11 , 12 liegen eng aneinander an, und die beiden äußeren Biegeradien 14 sind so klein wie möglich gewählt, damit die Außenfläche der Längsseite 5 möglichst glatt bleibt. Gegenüber dem Stegrücken 13 ist eine plateauartige Erhebung 15 angeordnet, die aus der unteren Längsseite 6 des Flachrohres 1 zur Innenseite 6' des Rohres hin ausgeprägt ist. Diese Erhebung bzw. Ausprägung 15 weist zur Innenseite 9, 10 des Rohres 1 hin eine Höhe h auf, die etwa 0,05 mm beträgt, d. h. etwa 20 % der Wandstärke s des Flachbandes. Die Breite b der Ausprägung 15 beträgt etwa 1 mm, d. h. sie entspricht etwa dem Vierfachen der Wandstärke s. Die Darstellung in Fig. 2 zeigt das Mehrkammerrohr 1 mit einer Dicke d0 in einem Zustand nach dem Falten des Steges 8 und dem Schweißen des Rohres, jedoch vor dem Kalibriervorgang, mit welchem die genaue Dicke d des Flachrohres 1 hergestellt wird. In sofern befindet sich zwischen dem Stegrücken 13 und der plateauartigen Erhebung 15 ein Spalt 16, d. h. der Stegrücken 13 liegt nicht auf der Ausprägung 15 auf. Dies kann sich auf Grund des Herstellungsprozesses ergeben, weil einerseits die Höhe des Steges 8 und andererseits die Rohrwandstärke s Toleranzen unterworfen sind und das Rohr aufgrund seiner Eigenelastizität zurückfedert. Da der Stegrücken jedoch später mit der gegenüberliegenden Seite 6 des Flachrohres, d. h. der Ausprägung 15 verlötet werden soll, muß einerseits eine Anlage zwischen Stegrücken 13 und Plateau 15 geschaffen und andererseits ein bestimmtes Endmaß für die Dicke d des Rohres gewährleistet sein. Dies geschieht durch den sogenannten Kalibrier-Vorgang.FIG. 2 shows the detail X from FIG. 1, that is to say an enlarged section with the web 8. As already mentioned, the web 8 is produced from the flat strip material, which has a thickness of s <0.26 mm, by a folding process. The web 8 has two legs 11, 12 which are connected to one another via a web back 13. Both legs 11, 12 lie close together and the two outer bending radii 14 are chosen to be as small as possible so that the outer surface of the long side 5 remains as smooth as possible. A plateau-like elevation 15 is arranged opposite the web back 13 and is pronounced from the lower longitudinal side 6 of the flat tube 1 to the inside 6 'of the tube. This elevation or shape 15 has a height h toward the inside 9, 10 of the tube 1, which is approximately 0.05 mm, ie approximately 20% of the wall thickness s of the flat strip. The width b of the shape 15 is approximately 1 mm, ie it corresponds approximately to four times the wall thickness s. The illustration in FIG. 2 shows the multi-chamber tube 1 with a thickness d 0 in a state after the web 8 has been folded and the tube has been welded, but before the calibration process with which the exact thickness d of the flat tube 1 is produced. In so far there is a gap 16 between the web back 13 and the plateau-like elevation 15, ie the web back 13 does not rest on the shape 15. This can result from the manufacturing process, because on the one hand the height of the web 8 and on the other hand the tube wall thickness s are subject to tolerances and the tube springs back due to its inherent elasticity. However, since the web back is later to be soldered to the opposite side 6 of the flat tube, ie the shape 15, on the one hand a contact between the web back 13 and the plateau 15 must be created and, on the other hand, a certain final dimension for the thickness d of the tube must be ensured. This is done through the so-called calibration process.
Fig. 3 zeigt den Ausschnitt des Rohres 1 , d. h. die Einzelheit X nach dem sogenannten Höhenkalibrieren, d. h. nachdem das Rohr in einem hier nicht dargestellten Rollensatz auf das Sollmaß d' gebracht worden ist. Bei diesem Höhenkalibrieren werden die beiden Längsseiten 5 und 6 - wie durch die Pfeile dargestellt - durch den erwähnten Rollensatz auf das Maß d' zusammengedrückt. Bei diesem Vorgang hat sich der Stegrücken 13 in die plateauartige Erhebung 15 eingeprägt und dort eine "Delle" 17 gebildet. Diese "Delle" 17 nimmt also nach dem Kalibrieren die toleranzbedingten Ungenauigkeiten,auf.Fig. 3 shows the section of the tube 1, d. H. the detail X after the so-called height calibration, d. H. after the tube has been brought to the desired dimension d 'in a roller set, not shown here. During this height calibration, the two long sides 5 and 6 - as shown by the arrows - are compressed to the dimension d 'by the roller set mentioned. During this process, the ridge 13 was impressed into the plateau-like elevation 15 and formed a "dent" 17 there. This "dent" 17 therefore takes up the tolerance-related inaccuracies after calibration.
Die Mehrkammerflachrohre werden anschließend mit Wellrippen - wie an sich bekannt - zu einem Wärmeübertrager verlötet. Dafür ist das Bandmaterial 2 für die Mehrkammerrohre beidseitig lotplattiert; in sofern ist einerseits eine Verlötung zwischen Stegrücken 13 und Ausprägung 15 als auch zwischen den Außenseiten 5, 6 und den nicht dargestellten Wellrippen gewährleistet. Der Steg 8 fungiert somit nicht nur als Trennwand, sondern auch als Zuganker zur Aufnahme von Innendruckkräften im Rohr. Die verbleibende Tiefe e der Einprägung 15 bzw. der "Delle" 17 ist so gering, daß sie die Verlötung zwischen Wellrippe und Außenseite des Rohres 1 nicht beeinträchtigt, d. h. der in diesem Bereich etwas vergrößerte Lotspalt kann ohne weiteres beim Lötprozeß mit Lot gefüllt werden, so daß eine ununterbrochene stoffschlüssige Verbindung zwischen Wellrippe und Außenwand des Rohres gewährleistet ist.The multi-chamber flat tubes are then soldered to corrugated fins - as is known per se - to form a heat exchanger. For this purpose, the strip material 2 for the multi-chamber tubes is solder-plated on both sides; insofar as soldering between the web back 13 and the shape 15 as well as between the outer sides 5, 6 and the corrugated ribs, not shown, is ensured. The web 8 thus acts not only as a partition, but also as a tie rod for absorbing internal pressure forces in the tube. The remaining depth e of the impression 15 or the “dent” 17 is so small that it does not impair the soldering between the corrugated fin and the outside of the tube 1, ie the solder gap which is somewhat enlarged in this area can easily filled with solder during the soldering process, so that an uninterrupted material connection between the corrugated fin and the outer wall of the tube is guaranteed.
Im oben beschriebenen Ausführungsbeispiel ist lediglich ein Steg, d. h. einIn the embodiment described above, only one web, i. H. on
Zweikammerrohr dargestellt. Die Erfindung ist jedoch auch auf Mehrkammerrohre mit einer beliebigen Anzahl von Stegen bzw. Kammern anwendbar. Dabei ist es von Vorteil, wenn jeweils die Stege auf einer Längsseite und die plateauartigen Ausprägungen auf der gegenüberliegenden Längsseite des Mehrkammerflachrohres angeordnet sind. Der Fertigungsvorgang und die genaue Lage der Längsschweißnaht können dadurch günstig beeinflußt werden.Two chamber tube shown. However, the invention is also applicable to multi-chamber tubes with any number of webs or chambers. It is advantageous if the webs are arranged on one long side and the plateau-like features on the opposite long side of the multi-chamber flat tube. The manufacturing process and the exact position of the longitudinal weld seam can be influenced favorably.
Das oben beschriebene Mehrkammerrohr wird vorzugsweise für luftgekühlte Kühlmittelkühler für Brennkraftmaschinen für Kraftfahrzeuge eingesetzt. The multi-chamber pipe described above is preferably used for air-cooled coolant coolers for internal combustion engines for motor vehicles.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Aus einem Flachband (2) hergestelltes, durch eine Längsnaht (4) geschlossenes Mehrkammerrohr mit zwei flachen Längsseiten (5, 6) und zwei gekrümmten Schmalseiten (3, 7) und mit mindestens einem aus dem Flachband (2) gefalteten Steg (8), der benachbarte Kammern (9, 10) abteilt und mit der gegenüberliegenden Rohrinnen- wand (6) verlötet ist, dadurch gekennzeichnet, daß das Flachband1. Made from a flat band (2), closed by a longitudinal seam (4), multi-chamber tube with two flat long sides (5, 6) and two curved narrow sides (3, 7) and with at least one web (8) folded from the flat band (2) ), which divides adjacent chambers (9, 10) and is soldered to the opposite inner tube wall (6), characterized in that the flat strip
(2) im Bereich der Verlötung des mindestens einen Steges (8) eine zur Rohrinnenseite (61) gerichtete Ausprägung (15) aufweist.(2) in the area of the soldering of the at least one web (8) has an expression (15) directed towards the inside of the tube (6 1 ).
2. Mehrkammerrohr nach Anspruch 1 , dadurch gekennzeichnet, daß die Ausprägung (15) plateauartig ausgebildet ist, und zwar mit einer2. Multi-chamber pipe according to claim 1, characterized in that the expression (15) is plateau-like, with a
Breite b, die mindestens der doppelten Flachbanddicke s entspricht, und mit einer Höhe h, die wesentlich geringer als die Flachbanddicke s ist.Width b, which corresponds to at least twice the flat strip thickness s, and with a height h, which is significantly less than the flat strip thickness s.
3. Mehrkammerrohr nach Anspruch 2, dadurch gekennzeichnet, daß die Breite b größer als das Dreifache der Flachbanddicke s und die Höhe h kleiner als die Hälfte der Flachbanddicke s ist, d. h. b > 3 s und h < 0,5 s .3. Multi-chamber tube according to claim 2, characterized in that the width b is greater than three times the flat strip thickness s and the height h is less than half the flat strip thickness s, d. H. b> 3 s and h <0.5 s.
4. Mehrkammerrohr nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, daß die Flachbanddicke 0,1 < s < 0,5 mm ist.4. Multi-chamber tube according to claim 1, 2 or 3, characterized in that the flat strip thickness is 0.1 <s <0.5 mm.
5. Mehrkammerrohr nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Rohr eine Tiefe t im Bereich von 20 mm < t < 60 mm aufweist. 5. Multi-chamber tube according to one of the preceding claims, characterized in that the tube has a depth t in the range of 20 mm <t <60 mm.
6. Mehrkammerrohr nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Rohr eine Dicke d im Berich von 1 ,5 mm < d < 2,0 mm aufweist.6. Multi-chamber tube according to one of the preceding claims, characterized in that the tube has a thickness d in the range of 1.5 mm <d <2.0 mm.
7. Mehrkammerrohr nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Stege abwechselnd aus der einen Längsseite (5) und aus der gegenüberliegenden Längsseite (6) gefaltet und die Ausprägungen (15) ebenfalls abwechselnd auf der einem Steg (8) gegenüberliegenden Längsseite angeordnet sind.7. Multi-chamber tube according to one of the preceding claims, characterized in that the webs are alternately folded from one longitudinal side (5) and from the opposite longitudinal side (6) and the expressions (15) are also arranged alternately on the one longitudinal side (8) opposite are.
8. Mehrkammerrohr nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Stege (8) nur aus einer Längsseite (5) gefaltet und die Ausprägungen (15) auf der gegenüberliegenden Längsseite (6) angeordnet sind.8. Multi-chamber tube according to one of the preceding claims, characterized in that the webs (8) are folded only from one longitudinal side (5) and the expressions (15) are arranged on the opposite longitudinal side (6).
9. Verfahren zur Herstellung eines Mehrkammerrohres nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet,9. A method for producing a multi-chamber tube according to one of the preceding claims, characterized in that
- daß ein Flachband (2) bereit gestellt wird, - daß auf einer Hälfte des Flachbandes Stege (8) durch Falten und- That a flat band (2) is provided, - that on one half of the flat band webs (8) by folding and
- auf der anderen Hälfte des Flachbandes (2) die Ausprägungen (15) eingeformt werden,- On the other half of the flat strip (2), the stampings (15) are molded in,
- daß das Flachband (2) an einer Schmalseite (7) gebogen und an seiner .anderen Schmalseite (3) zur Anlage gebracht und verschweißt wird,- That the flat strip (2) is bent on one narrow side (7) and brought into contact and welded on its other narrow side (3),
- daß die Stegrücken (13) zur Anlage mit der Ausprägung (15) gebracht und das Flachrohr (1) bezüglich seiner Dicke d, gegebenenfalls unter Verformung der Ausprägung (15) auf ein Sollmaß d' kalibriert wird. - That the web back (13) brought into contact with the expression (15) and the flat tube (1) with respect to its thickness d, optionally with deformation of the expression (15) is calibrated to a desired dimension d '.
EP03702456A 2002-01-17 2003-01-16 Multi-chamber flat tube Expired - Lifetime EP1468234B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10201512A DE10201512A1 (en) 2002-01-17 2002-01-17 Multi-chamber flat tube
DE10201512 2002-01-17
PCT/EP2003/000404 WO2003060410A1 (en) 2002-01-17 2003-01-16 Multi-chamber flat tube

Publications (2)

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EP1468234A1 true EP1468234A1 (en) 2004-10-20
EP1468234B1 EP1468234B1 (en) 2006-06-21

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US (2) US20050090374A1 (en)
EP (1) EP1468234B1 (en)
AT (1) ATE331196T1 (en)
AU (1) AU2003205618A1 (en)
DE (2) DE10201512A1 (en)
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WO (1) WO2003060410A1 (en)

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US20050090374A1 (en) 2005-04-28
WO2003060410A1 (en) 2003-07-24
US20080072426A1 (en) 2008-03-27
ES2266771T3 (en) 2007-03-01
ATE331196T1 (en) 2006-07-15
EP1468234B1 (en) 2006-06-21
AU2003205618A1 (en) 2003-07-30
DE50303940D1 (en) 2006-08-03
DE10201512A1 (en) 2003-07-31

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