EP1923650B1 - Flat pipe, especially for a heat exchanger - Google Patents

Flat pipe, especially for a heat exchanger Download PDF

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Publication number
EP1923650B1
EP1923650B1 EP20070022257 EP07022257A EP1923650B1 EP 1923650 B1 EP1923650 B1 EP 1923650B1 EP 20070022257 EP20070022257 EP 20070022257 EP 07022257 A EP07022257 A EP 07022257A EP 1923650 B1 EP1923650 B1 EP 1923650B1
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EP
European Patent Office
Prior art keywords
flat pipe
metal strip
chambers
previous
solder
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.)
Not-in-force
Application number
EP20070022257
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German (de)
French (fr)
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EP1923650A1 (en
Inventor
Christopher Dipl.-Ing. Walter
Michael Dipl.-Ing. Kohl
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
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Behr GmbH and Co KG
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Publication of EP1923650A1 publication Critical patent/EP1923650A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/151—Making tubes with multiple passages
    • 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

Definitions

  • the invention relates to a flat tube, in particular for a heat exchanger, according to the preamble of claim 1.
  • heat exchangers From the construction of heat exchangers, it is known to use, in particular made of aluminum flat tubes with multiple chambers, which can be produced in various ways. Are known extrusion methods and methods in which a metal strip or sheet metal strip is folded into a flat tube.
  • US 4,633,056 A describes a flat tube for a heat exchanger in which a z-shaped fold of a sheet metal strip forms a partition between two adjacent separate chambers of the exchanger tube.
  • the ends of the z-shaped folded sheet metal strip are turned over and abut to the enclosure of the chambers again in the region of the z-shaped fold. In this abutment area, the end areas are soldered or welded by electron beam. This means a considerable effort in the production of flat tubes.
  • an outer surface of the flat tube is largely plated with the solder material, the outer surface can be easily soldered with fin plates or similar elements, or even in its end regions with a bottom plate of the heat exchanger.
  • the sheet metal strip has a coating with a corrosion-inhibiting material that is different from the solder material.
  • a corrosion-inhibiting material may, for. B. be a coating based on zinc.
  • such a corrosion-inhibiting coating can also be applied to the solder plating, which however often means a reduction in the effectiveness of the protective coating. Therefore, the protective coating is particularly advantageously applied in areas in which there is no solder plating, in particular in the region of the inner surfaces of the chambers of the flat tube.
  • a width of the flat tube is determined essentially by the z-shaped fold and between about 0.5 mm and about 10 mm, particularly preferably between about 0.8 mm and about 4 mm, is.
  • the thickness of the sheet metal strip is preferably between about 0.1 mm and about 2 mm, and more preferably between about 0.15 mm and about 0.6 mm.
  • a depth of the flat tube in the depth direction is advantageously between about 6 mm and about 100 mm, more preferably between about 10 mm and about 50 mm.
  • a diameter of one of the chambers in the depth direction is advantageously between about 3 mm and about 50 mm, and more preferably between about 5 mm and about 25 mm.
  • Such dimensions are common in particular in the construction of heat exchangers of motor vehicles.
  • Fig. 1 shows a first embodiment of an unclaimed flat tube, which is made of a sheet-metal strip 1 based on an aluminum alloy.
  • the sheet metal strip 1 has a substantially rectangular cross section. A longitudinal direction of the sheet metal strip or of the flat tube runs perpendicular to the plane of the drawing Fig. 1 ,
  • the metal strip 1 is completely coated on each of its opposite sides with a Lotplatttechnik 2, 3.
  • a z-shaped fold 4 is first made in the middle region of the sheet metal strip 1.
  • the height of the fold 4 essentially determines the width of the finished flat tube.
  • left-side and right-side end portions 5, 6 of the sheet metal strip 1 are folded by 90 °, wherein the lengths of the end portions 5, 6 are not greater than the height of the z-shaped fold 4.
  • the areas of the sheet metal strip left and right of the fold 4 to Training two closed chambers 7, 8 of the flat tube turned over by 180 °.
  • the angled end portions 5, 6 with their outer surfaces touch the partition wall 4 on its opposite sides.
  • the prefolded flat tube (see lower illustration in Fig. 1 ) is subsequently placed in a soldering furnace, wherein by melting the Lotplattierungen the end portions 5, 6 are each soldered to the partition 4 fixed. As a result, the chambers 7, 8 sealed tight and pressure-resistant.
  • the height of the bent end region 5, 6 is in each case approximately smaller than the height of the dividing wall 4.
  • the width of the flat tube is not determined by the end regions, which is advantageous in the light of the dimensional tolerances of the width of the metal strip.
  • the inner surfaces of the chambers 7, 8 are not provided with Lotplatt réelle, but solder plating is only in the narrow area of the connection of the end portions 5, 6 with the partition wall 4 before.
  • solder plating 2 is applied only on one side of the sheet metal strip 1.
  • the solder plating 2 extends only from one lateral end to slightly above the middle of the sheet metal strip 1 (see top illustration in FIG Fig. 2 ).
  • the z-shaped fold 4 is still provided with solder plating on one side and also has one of the two ends 6 on one side Lotplatt réelle.
  • the other bent end 5 of the sheet-metal strip 1 has no Lotplatt réelle and is soldered in the finished bent state with the one-sided Lotplatt réelle the fold 4.
  • a flat tube with two chambers 7, 8 are folded, in which the inside of the chambers 7, 8 is no Lotplatt réelle present and outside a Lotplatt réelle only on a chamber 8 is present.
  • a corrosion protection layer is not explicitly shown in any of the illustrated or claimed embodiments. It may be particularly expedient depending on the requirements of the places where the sheet metal strip 1 is not occupied by Lotplatttechnik.
  • solder plating be present on the entire outer surface of the flat tube, for example for better connection with fin plates or other components of the heat exchanger
  • the solder plating as in the not claimed embodiment according to Fig. 3 be applied on both opposite sides of the metal strip 1, wherein the respective Lotplatt ist extends on one side only to about the middle of the metal strip 1.
  • the metal strip is plated with solder only on one side at each point, the opposite side not being plated with solder at this point (see the upper illustration in FIG Fig. 3 ).
  • the in Fig. 3 According to the in Fig.
  • the sheet metal strip is provided a flat tube having Lotplatt réelle on its entire outer surface and wherein the entire inner surface of the chambers 7, 8 is free of Lotplatt réelle.
  • a flat tube according to the invention is in Fig. 4 shown.
  • To get an excess of solder plating in the area the connection of the end portions 5, 6 to avoid the partition 4 is provided in the central region of the sheet metal strip 1 on either side of a Lotplatt réelle. This occupied on both sides not with Lotplatt réelle area 1 a of the metal strip 1 corresponds in its width about the z-shaped fold 4 (see middle illustration in Fig. 4 ).
  • the solder plating which serves to solder the end regions 5, 6 to the central fold region 4 is present in each case on the end regions 5, 6.
  • a "double" Lotplatt réelle in the investment area as in the not claimed embodiment according to Fig. 3 is thus avoided.
  • Fig. 5 shows a schematic sectional view of a heat exchanger with flat tubes according to one of the embodiments described above.
  • the flat tubes each have two in the depth direction of the heat exchanger arranged one behind the other chambers 7, 8 and between two adjacent flat tubes respectively rib members 9 are provided.
  • the rib element 9 serves to increase the contact surface with the fluid flowing past in the depth direction on the flat tubes, which absorbs heat from the fluid guided in the flat tubes or emits into this.
  • the rib elements 9 are suitably soldered to the surface of the flat tubes 7.
  • the solder plating provided on the outer surfaces of the flat tubes is used in a preferred manner.
  • Fig. 6 shows an example of a non-claimed flat tube, in which four separate chambers are arranged in the depth direction one behind the other.
  • the sheet metal strip 1 according to the illustration Fig. 6 is shown without Lotplatt ist, provided with a total of three Z-shaped folds 4a, 4b, 4c, which alternate in their folding direction.
  • the lateral end portions 5, 6 of the sheet metal strip 1 are angled and on each side of a sufficiently long projection of the sheet metal strip is folded. In each case, the end regions 5, 6 abut the outer folds 4a, 4c and are soldered to them.
  • two chambers 7a, 8a of the four chambers of the flat tube have a double wall.
  • the entire metal strip 1 may have a corresponding Lotplatt réelle or even a selectively provided only in the areas in question Lotplatt réelle.
  • Fig. 7 shows a schematic representation of an unclaimed heat exchanger with the four-chamber flat tubes according to Fig. 6 .
  • such flat tubes preferably have an even number of chambers, whereby the folding of the metal strip is simplified and in particular can be dispensed with bead-like folds for the production of partitions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

Die Erfindung betrifft ein Flachrohr, insbesondere für einen Wärmetauscher, nach dem Oberbegriff des Anspruchs 1.The invention relates to a flat tube, in particular for a heat exchanger, according to the preamble of claim 1.

Aus dem Bau von Wärmetauschern ist es bekannt, insbesondere aus Aluminium bestehende Flachrohre mit mehreren Kammern zu verwenden, die auf verschiedene Weise herstellbar sind. Bekannt sind Extrusionsverfahren und Verfahren, bei denen ein Blechstreifen oder Blechband zu einem Flachrohr gefaltet wird.From the construction of heat exchangers, it is known to use, in particular made of aluminum flat tubes with multiple chambers, which can be produced in various ways. Are known extrusion methods and methods in which a metal strip or sheet metal strip is folded into a flat tube.

US 4,633,056 A beschreibt ein Flachrohr für einen Wärmetauscher, bei dem eine z-förmige Faltung eines Blechstreifens eine Trennwand zwischen zwei benachbarten getrennten Kammern des Tauscherrohres ausbildet. Die Enden des z-förmig gefalteten Blechstreifens werden umgeschlagen und stoßen zur Umschließung der Kammern wieder im Bereich der z-förmigen Faltung an. In diesem Anstoßbereich werden die Endbereiche verlötet oder mittels Elektronenstrahl verschweißt. Dies bedeutet einen erheblichen Aufwand bei der Herstellung der Flachrohre. US 4,633,056 A describes a flat tube for a heat exchanger in which a z-shaped fold of a sheet metal strip forms a partition between two adjacent separate chambers of the exchanger tube. The ends of the z-shaped folded sheet metal strip are turned over and abut to the enclosure of the chambers again in the region of the z-shaped fold. In this abutment area, the end areas are soldered or welded by electron beam. This means a considerable effort in the production of flat tubes.

DE 195,48,495 A beschreibt ein Flachrohr gemäß dem Oberbegriff des Anspruchs 1. DE 195,48,495 A describes a flat tube according to the preamble of claim 1.

Es ist die Aufgabe der Erfindung, ein Flachrohr für einen Wärmetauscher anzugeben, das mechanisch stabil ist und zugleich einfach und kostengünstig herstellbar.It is the object of the invention to provide a flat tube for a heat exchanger, which is mechanically stable and at the same time simple and inexpensive to produce.

Diese Aufgabe wird für ein eingangs genanntes Flachrohr erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Durch die Plattierung des Blechstreifens mit einem Lotmaterial ist die Verlötung der anstoßenden Enden zu den geschlossenen Kammern des Flachrohres erheblich vereinfacht. Der Blechstreifen muss lediglich zum Flachrohr gebogen werden und kann dann als ganzes, ggf. sogar vormontiert zu einem Wärmetauscher, in einem Lötofen verlötet werden, da die Lötplattierung sich bereits auf dem Wandungsmaterial des Flachrohrs befindet.This object is achieved according to the invention for an initially mentioned flat tube with the characterizing features of claim 1. By plating the sheet metal strip with a solder material, the soldering of the abutting ends to the closed chambers of the flat tube is considerably simplified. The sheet metal strip only has to be bent to form a flat tube and can then be soldered as a whole, possibly even preassembled, to a heat exchanger in a soldering furnace, since the solder cladding is already on the wall material of the flat tube.

Insgesamt kann hierdurch sichergestellt werden, dass zum einen nur wenig Lotplattierung verwendet wird und zum anderen die Innenwände der Kammern weitgehend von Lotplattierung freigehalten werden.Overall, this can ensure that, on the one hand, only little solder plating is used and, on the other hand, the inner walls of the chambers are kept largely free from solder plating.

Da die innere Oberfläche der Kammern weitgehend keine Lotplattierung aufweist, wird vermieden, daß eine solche Lotplattierung je nach in den Rohren geführtem Fluid eine Kontamination des Fluids bewirt oder ungünstige Eigenschaften auf die Korrosionsfestigkeit des Flachrohrs hat. Dies gilt insbesondere bei sehr dünnen Flachrohrwänden, wie sie zum Zweck der Einsparung von Material und Gewicht insbesondere bei Wärmetauschern für Kraftfahrzeuge Verwendung finden.Since the inner surface of the chambers has substantially no Lotplattierung, it is avoided that such Lotplattierung depending on the guided in the pipes fluid contamination of the fluid or has adverse properties on the corrosion resistance of the flat tube. This is especially true for very thin flat tube walls, as they are used for the purpose of saving material and weight especially in heat exchangers for motor vehicles.

Da eine äußere Oberfläche des Flachrohrs weitgehend mit dem Lotmaterial plattiert ist kann die äußere Oberfläche auf einfache Weise mit Rippenblechen oder ähnlichen Elementen verlötet werden oder auch in seinen Endbereichen mit einem Bodenblech des Wärmetauschers.Since an outer surface of the flat tube is largely plated with the solder material, the outer surface can be easily soldered with fin plates or similar elements, or even in its end regions with a bottom plate of the heat exchanger.

Zur Verbesserung der Lebensdauer des Flachrohres kann vorteilhaft vorgesehen sein, dass der Blechstreifen eine Beschichtung mit einem von dem Lotmaterial verschiedenen, korrosionshemmenden Material aufweist. Ein solches korrosionshemmendes Material kann z. B. eine Beschichtung auf Basis von Zink sein. Grundsätzlich kann eine solche korrosionshemmende Beschichtung auch auf der Lotplattierung aufgebracht sein, was jedoch häufig eine Verringerung der Wirksamkeit der Schutzbeschichtung bedeutet. Besonders vorteilhaft ist daher die Schutzbeschichtung in Bereichen aufgebracht, in denen keine Lotplattierung vorliegt, insbesondere im Bereich der inneren Oberflächen der Kammern des Flachrohrs.In order to improve the service life of the flat tube, it can be advantageously provided that the sheet metal strip has a coating with a corrosion-inhibiting material that is different from the solder material. Such a corrosion-inhibiting material may, for. B. be a coating based on zinc. In principle, such a corrosion-inhibiting coating can also be applied to the solder plating, which however often means a reduction in the effectiveness of the protective coating. Therefore, the protective coating is particularly advantageously applied in areas in which there is no solder plating, in particular in the region of the inner surfaces of the chambers of the flat tube.

Hinsichtlich der Bemaßungen eines bevorzugten Ausführungsbeispiels eines erfindungsgemäßen Flachrohrs ist vorgesehen, dass eine Breite des Flachrohrs im wesentlichen durch die z-förmige Faltung bestimmt ist und zwischen etwa 0,5 mm und etwa 10 mm, besonders bevorzugt zwischen etwa 0,8 mm und etwa 4 mm, beträgt. Die Dicke des Blechstreifens beträgt dabei bevorzugt zwischen etwa 0,1 mm und etwa 2 mm und besonders bevorzugt zwischen etwa 0,15 mm und etwa 0,6 mm. Eine Tiefe des Flachrohrs in der Tiefenrichtung beträgt vorteilhaft zwischen etwa 6 mm und etwa 100 mm, besonders bevorzugt zwischen etwa 10 mm und etwa 50 mm. Ein Durchmesser einer der Kammern in der Tiefenrichtung beträgt vorteilhaft zwischen etwa 3 mm und etwa 50 mm und besonders bevorzugt zwischen etwa 5 mm und etwa 25 mm. Solche Maße sind insbesondere im Bau von Wärmetauschern von Kraftfahrzeugen üblich.With regard to the dimensions of a preferred embodiment of a flat tube according to the invention, it is provided that a width of the flat tube is determined essentially by the z-shaped fold and between about 0.5 mm and about 10 mm, particularly preferably between about 0.8 mm and about 4 mm, is. The thickness of the sheet metal strip is preferably between about 0.1 mm and about 2 mm, and more preferably between about 0.15 mm and about 0.6 mm. A depth of the flat tube in the depth direction is advantageously between about 6 mm and about 100 mm, more preferably between about 10 mm and about 50 mm. A diameter of one of the chambers in the depth direction is advantageously between about 3 mm and about 50 mm, and more preferably between about 5 mm and about 25 mm. Such dimensions are common in particular in the construction of heat exchangers of motor vehicles.

Mit einer Anzahl der Kammern dabei genau zwei lässt sich eine besonders einfache und effektive Verfaltung des Blechstreifens unter Verwendung von z-förmigen Faltungen zur Bereitstellung von Trennwänden zwischenWith a number of chambers doing exactly two can be a particularly simple and effective Verfaltung the metal strip using z-shaped folds to provide partitions between

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den nachfolgend beschriebenen Ausführungsbeispielen sowie aus den abhängigen Ansprüchen.Further features and advantages of the invention will become apparent from the embodiments described below and from the dependent claims.

Nachfolgend werden mehrere bevorzugte Ausführungsbeispiele eines erfindungsgemäßen Flachrohrs beschrieben und anhand der anliegenden Zeichnungen näher erläutert.

Fig. 1
zeigt eine schematische Darstellung eines nicht beanspruchten Flachrohrs, wobei drei Schritte einer Herstellung gezeigt sind.
Fig. 2
zeigt ein zweites Ausführungsbeispiel eines nicht beanspruchten Flachrohrs.
Fig. 3
zeigt ein drittes Ausführungsbeispiel eines nicht beanspruchten Flachrohrs.
Fig. 4
zeigt ein Flachrohr gemäß der Erfindung.
Fig. 5
zeigt eine schematische Schnittdarstellung eines Wärmetauschers mit erfindungsgemäßen Flachrohren.
Fig. 6
zeigt ein weiteres Ausführungsbeispiel eines nicht beanspruchten Flachrohrs mit vier Kammern.
Fig. 7
zeigt eine schematische Schnittansicht eines Wärmetauschers mit Flachrohren gemäß dem nicht beanspruchten Ausführungsbeispiel aus Fig. 6.
Hereinafter, several preferred embodiments of a flat tube according to the invention will be described and explained in more detail with reference to the accompanying drawings.
Fig. 1
shows a schematic representation of an unclaimed flat tube, wherein three steps of a production are shown.
Fig. 2
shows a second embodiment of an unclaimed flat tube.
Fig. 3
shows a third embodiment of an unclaimed flat tube.
Fig. 4
shows a flat tube according to the invention.
Fig. 5
shows a schematic sectional view of a heat exchanger with flat tubes according to the invention.
Fig. 6
shows a further embodiment of an unclaimed flat tube with four chambers.
Fig. 7
shows a schematic sectional view of a heat exchanger with flat tubes according to the embodiment not claimed Fig. 6 ,

Fig. 1 zeigt ein erstes Ausführungsbeispiel eines nicht beanspruchten Flachrohrs, das aus einem Blechstreifen 1 auf Basis einer Aluminiumlegierung hergestellt ist. Der Blechstreifen 1 hat einen im Wesentlichen rechteckigen Querschnitt. Eine Längsrichtung des Blechstreifens bzw. des Flachrohrs verläuft senkrecht zur Zeichnungsebene nach Fig. 1. Fig. 1 shows a first embodiment of an unclaimed flat tube, which is made of a sheet-metal strip 1 based on an aluminum alloy. The sheet metal strip 1 has a substantially rectangular cross section. A longitudinal direction of the sheet metal strip or of the flat tube runs perpendicular to the plane of the drawing Fig. 1 ,

Der Blechstreifen 1 ist auf jeder seiner gegenüberliegenden Seiten vollständig mit einer Lotplattierung 2, 3 beschichtet. Zur Herstellung des Flachrohrs aus dem Blechstreifen 1 wird zunächst eine z-förmige Faltung 4 im mittleren Bereich des Blechstreifens 1 vorgenommen. Die Höhe der Faltung 4 bestimmt dabei im Wesentlichen die Breite des fertigen Flachrohrs. Nachfolgend werden linksseitige und rechtsseitige Endbereiche 5, 6 des Blechstreifens 1 um 90° gefaltet, wobei die Längen der Endbereiche 5, 6 nicht größer sind als die Höhe der z-förmigen Faltung 4. Die Bereiche des Blechstreifens links und rechts der Faltung 4 werden zur Ausbildung zweier geschlossener Kammern 7, 8 des Flachrohrs um 180° umgeschlagen. Dabei berühren die abgewinkelten Endbereiche 5, 6 mit ihren Außenflächen jeweils die Trennwand 4 an deren gegenüberliegenden Seiten. Das so vorgefaltete Flachrohr (siehe untere Darstellung in Fig. 1) wird nachfolgend in einen Lötofen verbracht, wobei durch Schmelzen der Lotplattierungen die Endbereiche 5, 6 jeweils mit der Trennwand 4 fest verlötet werden. Hierdurch werden die Kammern 7, 8 dicht und druckfest verschlossen.The metal strip 1 is completely coated on each of its opposite sides with a Lotplattierung 2, 3. To produce the flat tube from the sheet metal strip 1, a z-shaped fold 4 is first made in the middle region of the sheet metal strip 1. The height of the fold 4 essentially determines the width of the finished flat tube. Subsequently, left-side and right-side end portions 5, 6 of the sheet metal strip 1 are folded by 90 °, wherein the lengths of the end portions 5, 6 are not greater than the height of the z-shaped fold 4. The areas of the sheet metal strip left and right of the fold 4 to Training two closed chambers 7, 8 of the flat tube turned over by 180 °. In this case, the angled end portions 5, 6 with their outer surfaces in each case touch the partition wall 4 on its opposite sides. The prefolded flat tube (see lower illustration in Fig. 1 ) is subsequently placed in a soldering furnace, wherein by melting the Lotplattierungen the end portions 5, 6 are each soldered to the partition 4 fixed. As a result, the chambers 7, 8 sealed tight and pressure-resistant.

Die Höhe der umgebogenen Endbereich 5, 6 ist jeweils etwa kleiner als die Höhe der Trennwand 4. Hierdurch wird die Breite des Flachrohrs nicht durch die Endbereiche bestimmt, was im Licht der Maßtoleranzen der Breite des Blechstreifens vorteilhaft ist.The height of the bent end region 5, 6 is in each case approximately smaller than the height of the dividing wall 4. As a result, the width of the flat tube is not determined by the end regions, which is advantageous in the light of the dimensional tolerances of the width of the metal strip.

Bei der nicht beanspruchten Ausführung nach Fig. 1 sind gemäß der beidseitig und vollständig vorliegenden Lotplattierung die Innenflächen der Kammern mit Lotplattierung beschichtet. Dies kann je nach Anwendungen Nachteile mit sich bringen und bedingt neben höheren Kosten ggf. eine verringerte Korrosionsresistenz. Erfahrungen haben gezeigt, dass übliche Lotplattierungen von Aluminium-Flachrohren trotz des Zink-Gehalts der Plattierungen einen Lochfraß oder auch eine Korrosion im Ansatzbereich eines Bodenteils nicht verhindern. Die Aufbringung einer zusätzlichen Korrosionsschutzschicht auf eine bestehende Lotplattierung ist dabei oft unzureichend. Im Interesse eines optimalen Korrosionsschutzes sollten daher kritische Bereiche des Blechs unmittelbar mit der Schutzschicht belegbar sein.In the unclaimed version after Fig. 1 According to the double-sided and complete solder plating, the inner surfaces of the chambers are coated with solder plating. Depending on the application, this can lead to disadvantages and, in addition to higher costs, may also result in reduced corrosion resistance. Experience has shown that conventional solder cladding of flat aluminum tubes, despite the zinc content of the cladding not prevent pitting or corrosion in the neck region of a bottom part. The application of an additional corrosion protection layer on an existing Lotplattierung is often insufficient. In the interests of optimum corrosion protection, critical areas of the sheet should therefore be assignable directly to the protective layer.

Bei einer verbesserten nicht beanspruchten Ausführungsform gemäß Fig. 2 sind daher die Innenflächen der Kammern 7, 8 nicht mit Lotplattierung versehen, sondern Lotplattierung liegt lediglich in dem eng begrenzten Bereich der Verbindung der Endbereiche 5, 6 mit der Trennwand 4 vor. Dies wird dadurch erreicht, dass die Lotplattierung 2 nur auf einer Seite des Blechstreifens 1 aufgebracht ist. Auf dieser einen Seite reicht die Lotplattierung 2 nur von einem seitlichen Ende bis etwas über die Mitte des Blechstreifens 1 (siehe obere Darstellung in Fig. 2). Hierdurch wird die z-förmige Faltung 4 auf einer Seite noch mit Lotplattierung versehen und zudem hat eines der beiden Enden 6 auf einer Seite Lotplattierung. Das andere umgebogene Ende 5 des Blechstreifens 1 weist keinerlei Lotplattierung auf und wird im fertig gebogenen Zustand mit der einseitigen Lotplattierung der Faltung 4 verlötet. Insgesamt kann somit ein Flachrohr mit zwei Kammern 7, 8 gefaltet werden, bei dem innenseitig der Kammern 7, 8 keine Lotplattierung vorliegt und außenseitig eine Lotplattierung nur auf einer Kammer 8 vorliegt.In an improved unclaimed embodiment according to Fig. 2 Therefore, the inner surfaces of the chambers 7, 8 are not provided with Lotplattierung, but solder plating is only in the narrow area of the connection of the end portions 5, 6 with the partition wall 4 before. This is achieved in that the solder plating 2 is applied only on one side of the sheet metal strip 1. On this one side, the solder plating 2 extends only from one lateral end to slightly above the middle of the sheet metal strip 1 (see top illustration in FIG Fig. 2 ). As a result, the z-shaped fold 4 is still provided with solder plating on one side and also has one of the two ends 6 on one side Lotplattierung. The other bent end 5 of the sheet-metal strip 1 has no Lotplattierung and is soldered in the finished bent state with the one-sided Lotplattierung the fold 4. Overall, thus, a flat tube with two chambers 7, 8 are folded, in which the inside of the chambers 7, 8 is no Lotplattierung present and outside a Lotplattierung only on a chamber 8 is present.

Eine Korrosionsschutzschicht ist in keinem der gezeigten oder beanspruchten Ausführungsbeispiele explizit dargestellt. Besonders zweckmäßig kann sie je nach Anforderungen an den Stellen vorgesehen werden, an denen der Blechstreifen 1 nicht mit Lotplattierung belegt ist.A corrosion protection layer is not explicitly shown in any of the illustrated or claimed embodiments. It may be particularly expedient depending on the requirements of the places where the sheet metal strip 1 is not occupied by Lotplattierung.

Falls es gewünscht ist, dass Lotplattierung auf der gesamten Außenfläche des Flachrohrs vorliegt, beispielsweise zur besseren Verbindung mit Rippenblechen oder anderen Bauteilen des Wärmetauschers, so kann die Lotplattierung wie im nicht beanspruchten Ausführungsbeispiel gemäß Fig. 3 auf beiden gegenüberliegenden Seiten des Blechstreifens 1 aufgebracht werden, wobei die jeweilige Lotplattierung auf einer Seite nur bis etwa zur Mitte des Blechstreifens 1 reicht. Hierdurch ist der Blechstreifen an jeder Stelle nur auf einer Seite mit Lot plattiert, wobei an dieser Stelle die gegenüberliegende Seite nicht mit Lot plattiert ist (siehe obere Darstellung in Fig. 3). Gemäß der in Fig. 3 dargestellten und zuvor beschriebenen Verfaltung des Blechstreifens wird ein Flachrohr bereitgestellt, das auf seiner gesamten Außenfläche Lotplattierung aufweist und wobei die gesamte Innenfläche der Kammern 7, 8 frei von Lotplattierung ist.
Ein Flachrohr gemäß der Erfindung ist in Fig. 4 dargestellt. Um einen Überschuss an Lotplattierung im Bereich der Anbindung der Endbereiche 5, 6 an die Trennwand 4 zu vermeiden wird im mittleren Bereich des Blechstreifens 1 auf keiner der beiden Seiten eine Lotplattierung vorgesehen. Dieser beidseitig nicht mit Lotplattierung belegte Bereich 1 a des Blechstreifens 1 entspricht in seiner Breite etwa der z-förmigen Faltung 4 (siehe mittlere Darstellung in Fig. 4). Die Lotplattierung die einem Verlöten der Endbereiche 5, 6 mit dem zentralen Faltungsbereich 4 dient, liegt jeweils auf den Endbereichen 5, 6 vor. Eine "doppelte" Lotplattierung im Anlagebereich wie im nicht beanspruchten Ausführungsbeispiel gemäß Fig. 3 ist somit vermieden.If it is desired that solder plating be present on the entire outer surface of the flat tube, for example for better connection with fin plates or other components of the heat exchanger, the solder plating as in the not claimed embodiment according to Fig. 3 be applied on both opposite sides of the metal strip 1, wherein the respective Lotplattierung extends on one side only to about the middle of the metal strip 1. As a result, the metal strip is plated with solder only on one side at each point, the opposite side not being plated with solder at this point (see the upper illustration in FIG Fig. 3 ). According to the in Fig. 3 illustrated and described above the sheet metal strip is provided a flat tube having Lotplattierung on its entire outer surface and wherein the entire inner surface of the chambers 7, 8 is free of Lotplattierung.
A flat tube according to the invention is in Fig. 4 shown. To get an excess of solder plating in the area the connection of the end portions 5, 6 to avoid the partition 4 is provided in the central region of the sheet metal strip 1 on either side of a Lotplattierung. This occupied on both sides not with Lotplattierung area 1 a of the metal strip 1 corresponds in its width about the z-shaped fold 4 (see middle illustration in Fig. 4 ). The solder plating which serves to solder the end regions 5, 6 to the central fold region 4 is present in each case on the end regions 5, 6. A "double" Lotplattierung in the investment area as in the not claimed embodiment according to Fig. 3 is thus avoided.

Fig. 5 zeigt eine schematische Schnittansicht eines Wärmetauschers mit Flachrohren nach einem der zuvor beschriebenen Ausführungsbeispiele. Die Flachrohre haben jeweils zwei in Tiefenrichtung des Wärmetauschers hintereinander angeordnete Kammern 7, 8 und zwischen zwei benachbarten Flachrohren sind jeweils Rippenelemente 9 vorgesehen. Das Rippenelement 9 dient einer Vergrößerung der Kontaktfläche mit dem in Tiefenrichtung an den Flachrohren vorbeiströmenden Fluid, das Wärme von dem in den Flachrohren geführten Fluid aufnimmt oder in dieses abgibt. Zur Verbesserung der Wärmeleitung zwischen den Flachrohren 7 und den Rippenelementen 9 sind die Rippenelemente 9 zweckmäßig mit der Oberfläche der Flachrohre 7 verlötet. Hierzu dient auf bevorzugter Weise die an den Außenflächen der Flachrohre vorgesehene Lotplattierung. Fig. 5 shows a schematic sectional view of a heat exchanger with flat tubes according to one of the embodiments described above. The flat tubes each have two in the depth direction of the heat exchanger arranged one behind the other chambers 7, 8 and between two adjacent flat tubes respectively rib members 9 are provided. The rib element 9 serves to increase the contact surface with the fluid flowing past in the depth direction on the flat tubes, which absorbs heat from the fluid guided in the flat tubes or emits into this. To improve the heat conduction between the flat tubes 7 and the rib elements 9, the rib elements 9 are suitably soldered to the surface of the flat tubes 7. For this purpose, the solder plating provided on the outer surfaces of the flat tubes is used in a preferred manner.

Fig. 6 zeigt ein Beispiel eines nicht beanspruchten Flachrohrs, bei dem vier separate Kammern in Tiefenrichtung hintereinander angeordnet sind. Hierzu wird der Blechstreifen 1, der in der Darstellung nach Fig. 6 ohne Lotplattierung gezeigt ist, mit insgesamt drei z-förmigen Faltungen 4a, 4b, 4c versehen, die in ihrer Faltungsrichtung alternieren. Wie in den zuvor beschriebenen Beispielen werden die seitlichen Endbereiche 5, 6 des Blechstreifens 1 abgewinkelt und auf jeder Seite wird ein ausreichend langer Überstand des Blechstreifens umgelegt. Die Endbereiche 5, 6 stoßen dabei jeweils an die äußeren der Faltungen 4a, 4c an und werden mit diesen verlötet. Konstruktiv bedingt haben zwei Kammern 7a, 8a der insgesamt vier Kammern des Flachrohrs eine doppelte Wandung. Um Druckfestigkeit und die Abdichtung der Kammern untereinander zu gewährleisten, sind diese Wandungen im Bereich ihrer gegenseitigen Anlage zweckmäßig miteinander verlötet. Hierzu kann der gesamte Blechstreifen 1 eine entsprechende Lotplattierung aufweisen oder auch eine nur selektiv in den betreffenden Bereichen vorgesehene Lotplattierung. Fig. 6 shows an example of a non-claimed flat tube, in which four separate chambers are arranged in the depth direction one behind the other. For this purpose, the sheet metal strip 1, according to the illustration Fig. 6 is shown without Lotplattierung, provided with a total of three Z-shaped folds 4a, 4b, 4c, which alternate in their folding direction. As in the examples described above, the lateral end portions 5, 6 of the sheet metal strip 1 are angled and on each side of a sufficiently long projection of the sheet metal strip is folded. In each case, the end regions 5, 6 abut the outer folds 4a, 4c and are soldered to them. Structurally, two chambers 7a, 8a of the four chambers of the flat tube have a double wall. To ensure compressive strength and the sealing of the chambers with each other, these are Walls in the area of their mutual investment appropriately soldered together. For this purpose, the entire metal strip 1 may have a corresponding Lotplattierung or even a selectively provided only in the areas in question Lotplattierung.

Fig. 7 zeigt eine schematische Darstellung eines nicht beanspruchten Wärmetauschers mit den Vierkammer-Flachrohren gemäß Fig. 6. Wie ein Vergleich der konstruktiven Schemata der Zweikammer-Flachrohre (Fig. 1) und der Vierkammer-Flachrohre nach Fig. 6 zeigt, haben solche Flachrohre bevorzugt eine gerade Anzahl von Kammern, wodurch die Faltung des Blechstreifens vereinfacht ist und insbesondere auf sickenartige Faltungen zur Herstellung von Trennwänden verzichtet werden kann. Fig. 7 shows a schematic representation of an unclaimed heat exchanger with the four-chamber flat tubes according to Fig. 6 , As a comparison of the constructive schemes of the two-chamber flat tubes ( Fig. 1 ) and the four-chamber flat tubes after Fig. 6 shows, such flat tubes preferably have an even number of chambers, whereby the folding of the metal strip is simplified and in particular can be dispensed with bead-like folds for the production of partitions.

Claims (8)

  1. A flat pipe, in particular for a heat exchanger, comprising a metal strip (1) extending in a longitudinal direction of the flat pipe, wherein the flat pipe is formed about the longitudinal direction by means of blending the metal strip (1), wherein the flat pipe has at least two chambers (7, 8) being disposed behind each other in a depth direction, wherein at least one partition (4) is embodied by an essentially z-shaped bend of the metal strip between the chambers (7, 8), and wherein both angled end areas (5, 6) of the metal strip (1) adjoin the partition (4), wherein the metal strip (1) has an at least partial plating (2, 3) of a solder material, characterized in that the plating (2, 3) is disposed in a striped partial area in a longitudinal direction on both sides of the metal strip (1) such that each location, with the exception of the center area (1a), is plated with solder only on one side, wherein at this location the opposite side is not plated with solder such that an interval surface of the chambers (7, 8) largely has no solder plating, and an eternal surface of the flat pipe, and that an area of the connection of the end areas (5, 6) to the partition (4) is largely plated with the solder material.
  2. The flat pipe according to clam 1, characterized in that the center area (1a) corresponds it its width approximately the z-shaped fold (4).
  3. The flat pipe according to one of the previous claims, characterized in that the metal strip (1) has a coating of a corrosion-inhibiting maternal that is different from the solder material.
  4. The flat pipe according to one of the previous claims, characterized in that a with of the flat pipe is essentially determined by the z-shaped fold (4), and is between about 0.5 mm and about 10 mm, in particular between about 0.8 mm and about 4 mm.
  5. The flat pipe according to one of the previous claims, characterized, in that a thickness of the metal strip (1) is between about 0.1 mm and about 2 mm, in particular between about 0.15 mm and about 0.6 mm.
  6. The flat pipe according to one of the previous claims, characterized in that a depth of the flat pipe in the depth direction is between about 6 mm and about 100 mm, in particular between about 10 mm and about 50 mm.
  7. The flat pipe according to one of the previous claims, characterized in that a diameter of a chamber (7, 8) in the depth direction is between about 3 mm and about 50 mm, in particular between about 5 mm and about 25 mm.
  8. The flat pipe according to one of the previous claims, characterized in that the number of chambers (7, 8) is exactly two.
EP20070022257 2006-11-16 2007-11-16 Flat pipe, especially for a heat exchanger Not-in-force EP1923650B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610054036 DE102006054036A1 (en) 2006-11-16 2006-11-16 Flat tube, in particular for a heat exchanger

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Publication Number Publication Date
EP1923650A1 EP1923650A1 (en) 2008-05-21
EP1923650B1 true EP1923650B1 (en) 2013-03-13

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DE (1) DE102006054036A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009041618A1 (en) * 2009-09-17 2011-03-24 Behr Gmbh & Co. Kg Flat tube for a heat exchanger
CN105525980A (en) * 2014-09-30 2016-04-27 泰安鼎鑫冷却器有限公司 Corrosion-resistant high-strength radiating pipe

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3327660A1 (en) * 1983-06-20 1984-12-20 Motoren Turbinen Union Method for the production of small shaped tubes for tubular heat exchangers
FR2547649A1 (en) 1983-06-14 1984-12-21 Mtu Muenchen Gmbh METHOD FOR MANUFACTURING SMALL PROFILE TUBES FOR HEAT EXCHANGERS WITH SMALL TUBES AND SMALL TUBES AS PRODUCED
DE19548244B4 (en) * 1995-12-22 2006-03-02 Behr Gmbh & Co. Kg Process for producing brazed aluminum heat exchangers
DE19548495C2 (en) * 1995-12-22 2000-04-20 Valeo Klimatech Gmbh & Co Kg Heat exchanger block for heat exchangers for motor vehicles and method for the production thereof
FR2749648B1 (en) * 1996-06-05 1998-09-04 Valeo Thermique Moteur Sa FLAT TUBE WITH MEDIUM SPACER FOR HEAT EXCHANGER
FR2770634B1 (en) * 1997-11-06 2000-01-28 Valeo Thermique Moteur Sa BENDED TUBE WITH TWO CIRCULATION CHANNELS FOR HEAT EXCHANGER
JP3901349B2 (en) * 1998-06-12 2007-04-04 カルソニックカンセイ株式会社 Flat heat transfer tube for heat exchanger
DE10053653A1 (en) * 2000-10-28 2002-05-08 Modine Mfg Co Flat tube for heat exchanger has sheet strip coated on both sides with solder
FR2832788B1 (en) * 2001-11-26 2004-06-04 Valeo Climatisation TUBE PROFILES FOR HEAT EXCHANGER

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EP1923650A1 (en) 2008-05-21

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