EP0732560A2 - Tube-in-tube heat exchanger and process for producing same - Google Patents

Tube-in-tube heat exchanger and process for producing same Download PDF

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Publication number
EP0732560A2
EP0732560A2 EP96103446A EP96103446A EP0732560A2 EP 0732560 A2 EP0732560 A2 EP 0732560A2 EP 96103446 A EP96103446 A EP 96103446A EP 96103446 A EP96103446 A EP 96103446A EP 0732560 A2 EP0732560 A2 EP 0732560A2
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EP
European Patent Office
Prior art keywords
heat exchanger
tube heat
tube
exchanger according
tubes
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
EP96103446A
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German (de)
French (fr)
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EP0732560A3 (en
EP0732560B1 (en
Inventor
Karl-Heinz Dipl-Ing. Staffa
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Mahle Behr GmbH and Co KG
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Behr GmbH and Co KG
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Publication of EP0732560A3 publication Critical patent/EP0732560A3/en
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Publication of EP0732560B1 publication Critical patent/EP0732560B1/en
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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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0234—Header boxes; End plates having a second heat exchanger disposed there within, e.g. oil cooler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/916—Oil cooler

Definitions

  • the invention relates to a double-tube heat exchanger, consisting of two coaxially nested tubes, in particular made of aluminum, which are tightly connected at their ends to form a flow channel between them, a turbulence insert possibly being inserted into the flow channel, and a method for its production
  • Double tube heat exchangers of this type are known.
  • DE-OS 30 21 240 shows a stainless steel double tube heat exchanger in which the two steel tubes are connected at their ends by means of a fusion welding process.
  • the inner tube is widened there in its end region, to the extent that the widened part of the inner tube runs parallel to the outer tube over a certain length.
  • the welding is carried out in this area.
  • a turbulence insert sits between the two pipes.
  • this double tube heat exchanger In the manufacture of this double tube heat exchanger, the procedure is such that after attaching to fittings on the outer tube with the aid of a projection welding method, the two tubes are pushed into one another with the aid of a device, after which the ends of the inner tube are then so applied by applying pressure be widely expanded that they rest on the outer tube for the purpose of welding.
  • Such a type of production is relatively complex.
  • the invention has for its object to propose a double tube heat exchanger of the type mentioned and a method for its production, which are particularly suitable for the use of aluminum as a starting material, make a complex assembly process unnecessary and also avoid the risk of corrosion.
  • a double-tube heat exchanger of the type mentioned in which at least one of at least two ends of the tubes one of the tubes protruding circumferential beaded collar is provided, the height of which corresponds to the difference between the radii of the inner wall of the outer and the outer wall of the inner tube and in which the collars are soldered tightly to the tube wall against which they rest.
  • the bundles also serve for tight soldering, the so-called Nocolok soldering method expediently using the method provided according to the invention and explained later (see SAE Technical Paper Series, Claydon and Sugihara, Brazing Aluminum Automotive Heat Exchanger Assemblies Using a Non-Corrosive Flux Process, International Congress & Exposition Detroit USA, February 28 to March 4, 1983), which uses a flux which is non-corrosive after soldering and whose residues therefore do not need to be removed. It is necessary that at least one of the pipes to be joined together later consists of a suitable solder-plated material and is provided with Nocolok flux at the points to be soldered. Either both pipes or only one can be plated accordingly. It is also possible to plate the turbulence insert.
  • each bead-like collar can be pressed out of the material of the tube in the manner of a circumferential bead just before its end. It is possible for each tube to be provided with a bead at only one end, the beads then being opposite one another when the tubes are inserted into one another and enclosing the flow channel between them. However, it is also possible to provide only one tube with two beads and to leave the other tube smooth. Rolling to form the beads is also possible.
  • a method has proven to be particularly advantageous in which at least one of the tubes is first pressed out in the region of the ends of the tube-like beads, then at least one of the tubes before or after the beads are pressed out or, if necessary, the turbulence insert is charged with a Nocolok flux, then the two tubes are pushed over one another and kept at a distance by the beads, after which the tubes held together are heated for the purpose of soldering.
  • the new double tube heat exchanger is particularly suitable as an oil cooler for installation in a water tank of a cooler for a motor vehicle engine.
  • a double-tube heat exchanger designed as a double-tube oil cooler, which consists of an outer tube (1) and an inner tube (2) each made of solder-plated aluminum.
  • the tubes are made from a flat material bent after plating and joined with a longitudinal weld.
  • Two connecting pieces (3 and 4) are placed on the outer tube in a manner known per se, through which oil, for example hot engine or gear oil, in the direction of the arrows (5) into an annular flow channel (6) between the outer tube and the inner tube (1 or 2) can be performed, which is to be cooled by a second heat exchange medium, in the exemplary embodiment water, which is guided through the inner tube (2) and enters it in the direction of the arrow (7).
  • the oil flows through the inlet connection (3) and through an inlet opening (not shown) in the pipe (1) and leaves this flow channel through the outlet connection (4) and through one also not shown opening in the outer tube (1).
  • the flow channel (6) is provided with a turbulence insert (8) which is designed in a known manner.
  • the flow channel (6) is delimited on the outside by a circumferential bead-like collar (9) which is pressed out in the form of a circumferential bead (see also FIG. 2) from the inner tube (2) in the region of the left end (2a) thereof.
  • the height (h) (Fig.
  • the procedure is such that the inner tube (2) is first provided with the beads (9 or 10) pressed out in the region of its two ends.
  • the inner tube (2) or the outer tube (1) are then provided with flux and after the turbulence insert (8) has been arranged between the collars (9 and 10), the outer tube (1) is pushed open axially.
  • An expansion of the inner tube (2) will then generally be provided in order to bring the turbulence plate (8) in the annular flow channel (6) into a solderable system on the tube walls.
  • the arrangement thus produced is heated to the necessary temperature in the soldering furnace, so that dense solder joints are formed in the region of the bundles (9 and 10) and, of course, also in the region of the attached connecting pieces (3 and 4). After cooling, the double tube heat exchanger is ready.
  • Fig. 3 shows a modification insofar as here the outer tube (1 ') is provided in the region of its right end with a circumferential collar (10') pressed inwards like a bead, while the inner tube (2) is only provided at its left end with the outward collar (9) is provided.
  • Both bundles (9 and 10 ') are dimensioned as the collar (9) and as previously described, so that during manufacture, the turbulence insert (8) in tube form can be pushed onto the inner tube (2) until it comes into contact with the collar (9).
  • the outer tube (1 ') can then be pushed axially from right to left, ie in the direction of arrow (7) onto the inner tube (2) and onto the turbulence insert (8). until the pipe ends are aligned.
  • the soldering process is then carried out in the same manner as previously explained.
  • This embodiment has the advantage that the turbulence insert can also be pushed on axially, so that a relatively simple assembly is possible.
  • Fig. 4 shows a variant in that here a smooth outer tube (1) (as in Fig. 1) is provided, but that the inner tube (2 ') has at its left end an outwardly rolled collar (11), the Dimensions correspond to those of the federal government (9).
  • This rolled collar (11) also allows the outer tube (1) to be placed and guided during assembly. At the same time, this collar (11) serves as a sealing point after the soldering process.
  • the inner tube (2 ') can be provided with an outwardly rolled collar (11) at both ends. It is also possible to arrange only the left rolled collar (11) shown, while the outer tube (1) has an inwardly rolled collar on the right side, so that assembly as in FIG. 3 is possible.
  • the outer tube (2) has bundles rolled inwards, as is also possible in principle in the technical reversal in the embodiment according to FIG. 1, in which the bundles (9 and 10) are not directed outwards from the inner tube, but inwards from the outer tube (1).
  • All of the embodiments ensure simple installation and are particularly suitable for the production of the double tube heat exchanger made of aluminum and for the soldering using the Nocolok process.
  • an advantageous embodiment of the new double-tube heat exchanger is shown in that the double-tube heat exchanger is installed there directly as an oil cooler in one of the cooler sumps for the engine coolant.
  • a double-tube cooler (12) is installed directly in a collecting tank (13) of a coolant cooler for a motor vehicle engine, which is not shown in detail because it is known.
  • the collecting box (13) is closed from its lower end (13a) by a tube sheet (not shown) and therefore there is a flow against the outer tube (14) of the tubes opening into the tube sheet but also not shown ( 1) of the double tube oil cooler (12) instead.
  • the flow of the coolant also passes through the interior of the inner tube (2) if the double-tube cooler is suitably arranged for supply or return connection of the collecting tank (13).
  • the outer tube (1) has been provided with an opening (15) at at least two points and the edge of this hole has then been pulled out in a collar-like manner by conventional means and in the form of the flanged edge (16) around an opening in the collecting box (13) crimped around.
  • a connection piece (3 ') is then placed on the opening (15) in the outer tube (2) and in the collecting box (13), which, like the flanged edge (16), is tightly soldered to the collecting box (13).
  • the collecting box (13) in the exemplary embodiment also consists of a solder-plated aluminum, so that it is sufficient for the production to apply the suitable flux in the region of the edge (16) and in the region of the seated jaws of the connection (3 ') in order to with the Nocolok process, a complete tight soldering of the double tube cooler (12) (as is also explained in the previous figures) and the connection between this double tube cooler and the header box (13) and its connection piece (3 ').
  • the outer tube (1) is of course also assigned a further opening, not shown in FIG. 5, which is fastened in the same way to the collecting box (13) and with it is soldered so that, as in the examples of FIGS. 1 to 4, the oil to be cooled is fed into the space between the outer tube (1) and inner tube (2) through the connecting piece (3 ') and again through the connecting piece (not shown) can be dissipated.
  • the advantage of the embodiment shown in FIG. 5 is that a cooler made exclusively of aluminum can be provided with a double-tube oil cooler, on which no other materials are used, so that simple recycling is possible.
  • Fig. 6 shows an embodiment largely similar to that of Fig. 5. The only difference is that here the neck (17) of the double-tube cooler (12 ') drawn outwards from the opening (15) does not extend around the edge of a corresponding opening in the Collection box (13 ') flanged around, but is pressed into a corresponding recess (18) of the connecting piece (3' '). This neck (17) can also be pressed into the groove (19) within the connecting piece (3 '').
  • This embodiment also enables perfect recycling since the entire cooler, including the double tube cooler, is made of aluminum.
  • the collecting box (13) can either - as shown in FIGS. 5 and 6 - be half-shell-shaped and soldered to an additional metal base, or it can be made in one piece from a solder-plated tube or from two half-shells soldered to one another.

Abstract

A turbulence device (8) can be inserted in the flow-channel. At least one all-round bulge-type union (9,10) is provided at both ends of the tubes (1,2) extending from at least one of the tubes. The height of the union corresponds to the difference of the radii of the inner wall of the outer and the outer wall of the inner tube. The union can be soldered to the tube wall with the turbulence device. Each union is pressed out of the material of the tube. One tube is smooth and the other at its two ends is formed with a bulge. The union can be produced by rolling in the end of the tube.

Description

Die Erfindung betrifft einen Doppelrohrwärmetauscher, bestehend aus zwei koaxial ineinandergesetzten Rohren, insbesondere aus Aluminium, die an ihren Enden miteinander zur Bildung eines zwischen ihnen liegenden Strömungskanales dicht verbunden sind, wobei in den Strömungskanal gegebenenfalls eine Turbulenzeinlage eingesetzt ist, sowie ein Verfahren zu seiner HerstellungThe invention relates to a double-tube heat exchanger, consisting of two coaxially nested tubes, in particular made of aluminum, which are tightly connected at their ends to form a flow channel between them, a turbulence insert possibly being inserted into the flow channel, and a method for its production

Doppelrohrwärmetauscher dieser Art sind bekannt. So zeigt beispielsweise die DE-OS 30 21 240 einen aus nichtrostendem Stahl bestehenden Doppelrohrwärmetauscher, bei dem die beiden Stahlrohre an ihren Enden mit Hilfe eines Schmelzschweißverfahrens miteinander verbunden sind. Zu diesem Zweck ist dort das innere Rohr in seinem Endbereich aufgeweitet, und zwar so weit, daß der aufgeweitete Teil des Innenrohres über eine bestimmte Länge parallel zum Außenrohr verläuft. In diesem Bereich ist die Schweißung vorgenommen. Zwischen beiden Rohren sitzt eine Turbulenzeinlage. Bei der Herstellung dieses Doppelrohrwärmetauschers wird dabei so vorgegangen, daß nach dem Anbringen an Anschlußstücken am Außenrohr mit Hilfe eines Buckelschweißverfahrens die beiden Rohre mit Hilfe einer Vorrichtung auf Abstand ineinandergeschoben werden, wonach dann die Enden des inneren Rohres durch Anwendung von Druck so weit aufgeweitet werden, daß sie am Außenrohr zum Zweck der Verschweißung anliegen. Eine solche Herstellungsart ist verhältnismäßig aufwendig.Double tube heat exchangers of this type are known. For example, DE-OS 30 21 240 shows a stainless steel double tube heat exchanger in which the two steel tubes are connected at their ends by means of a fusion welding process. For this purpose, the inner tube is widened there in its end region, to the extent that the widened part of the inner tube runs parallel to the outer tube over a certain length. The welding is carried out in this area. A turbulence insert sits between the two pipes. In the manufacture of this double tube heat exchanger, the procedure is such that after attaching to fittings on the outer tube with the aid of a projection welding method, the two tubes are pushed into one another with the aid of a device, after which the ends of the inner tube are then so applied by applying pressure be widely expanded that they rest on the outer tube for the purpose of welding. Such a type of production is relatively complex.

Aus der DE-OS 26 12 416 ist ein ähnlich aufgebauter Doppelrohrwärmetauscher bekannt, bei der ebenfalls die Enden des Innenrohres zum Zweck der Verschweißung nach außen aufgebogen werden, bis sie am Außenrohr anliegen.From DE-OS 26 12 416 a similarly constructed double tube heat exchanger is known, in which the ends of the inner tube are also bent outwards for the purpose of welding until they abut the outer tube.

Bei einer anderen Bauart nach der DE 39 12 534 A1 werden die Enden des Außenrohres so weit eingezogen, daß sie am Innenrohr durch ein Schutzgasschweißverfahren befestigt werden können. Auch bei dieser Bauart ist aber zunächst eine koaxiale Ausrichtung der beiden Rohre erforderlich. Vor allen Dingen besteht die Gefahr einer Korrosion der Schweißnähte, wenn nicht ein relativ aufwendiges, korrosionsbeständiges Ausgangsmaterial vorgesehen wird.In another design according to DE 39 12 534 A1, the ends of the outer tube are drawn in so far that they can be attached to the inner tube by an inert gas welding process. With this type of construction, however, a coaxial alignment of the two pipes is first necessary. Above all, there is a risk of corrosion of the weld seams unless a relatively complex, corrosion-resistant starting material is provided.

Aus der DE 31 33 756 C2 schließlich ist eine Bauart eines Doppelrohrwärmetauschers mit zwei koaxialen Rohren und einer dazwischen angeordneten Turbulenzeinlage bekannt, bei der die beiden Rohre durch ein stirnseitig aufsteckbares Anschlußstück sowohl auf Abstand gehalten, als auch gegeneinander abgedichtet sind. Diese Bauart macht einen Schweißvorgang nicht notwendig, jedoch die Herstellung und die Montage eines verhältnismäßig aufwendigen Aufsteckendstückes.From DE 31 33 756 C2, finally, a type of double-tube heat exchanger with two coaxial tubes and a turbulence insert arranged between them is known, in which the two tubes are both kept at a distance by a plug-in end piece and are sealed off from one another. This design does not make a welding process necessary, but the manufacture and assembly of a relatively complex push-on end piece.

Der Erfindung liegt die Aufgabe zugrunde, einen Doppelrohrwärmetauscher der eingangs genannten Art und ein Verfahren zu seiner Herstellung vorzuschlagen, die insbesondere für die Verwendung von Aluminium als Ausgangsmaterial geeignet sind, einen aufwendigen Montagevorgang überflüssig machen und auch die Gefahr einer Korrosion vermeiden.The invention has for its object to propose a double tube heat exchanger of the type mentioned and a method for its production, which are particularly suitable for the use of aluminum as a starting material, make a complex assembly process unnecessary and also avoid the risk of corrosion.

Zur Lösung eines Teiles dieser Aufgabe wird ein Doppelrohrwärmetauscher der eingangs genannten Art vorgeschlagen, bei dem an beiden Enden der Rohre mindestens ein von mindestens einem der Rohre abragender umlaufender wulstartiger Bund vorgesehen ist, dessen Höhe der Differenz der Radien der Innenwand des äußeren und der Außenwand des inneren Rohres entspricht und bei dem die Bunde dicht mit der Rohrwand verlötet sind, an der sie anliegen. Durch diese Ausgestaltung brauchen die beiden Rohre nur axial übereinandergeschoben werden, wobei sich bei diesem Vorgang bereits der notwendige Ringraum zwischen den Rohren bildet. Eine gesonderte Ausrichtung ist nicht notwendig, da die Bunde diese Ausrichtung übernehmen. Die Bunde dienen gleichzeitig zur dichten Verlötung, wobei nach dem erfindungsgemäß vorgesehenen und später noch erläuterten Verfahren zweckmäßig das sogenannte Nocolok-Lötverfahren (siehe SAE Technical Paper Series, Claydon und Sugihara, Brazing Aluminium Automotive Heat Exchanger Assemblies Using a Non-Corrosive Flux Process, International Congress & Exposition Detroit USA, 28. Februar bis 04. März 1983) verwendet wird, bei dem ein Flußmittel verwendet wird, das nach dem Löten nicht korrodierend ist und dessen Rückstände daher auch nicht entfernt zu werden brauchen. Es ist notwendig, daß zumindest eines der später ineinanderzufügenden Rohre aus geeignetem lotplattiertem Material besteht und an den zu verlötenden Stellen mit Nocolok-Flußmittel versehen wird. Es können entweder beide Rohre oder nur eines entsprechend plattiert werden. Möglich ist es auch, die Turbulenzeinlage zu plattieren.To solve part of this problem, a double-tube heat exchanger of the type mentioned is proposed, in which at least one of at least two ends of the tubes one of the tubes protruding circumferential beaded collar is provided, the height of which corresponds to the difference between the radii of the inner wall of the outer and the outer wall of the inner tube and in which the collars are soldered tightly to the tube wall against which they rest. With this configuration, the two pipes only need to be pushed axially one above the other, the necessary annular space between the pipes already being formed in this process. A separate alignment is not necessary because the bundles take over this alignment. The bundles also serve for tight soldering, the so-called Nocolok soldering method expediently using the method provided according to the invention and explained later (see SAE Technical Paper Series, Claydon and Sugihara, Brazing Aluminum Automotive Heat Exchanger Assemblies Using a Non-Corrosive Flux Process, International Congress & Exposition Detroit USA, February 28 to March 4, 1983), which uses a flux which is non-corrosive after soldering and whose residues therefore do not need to be removed. It is necessary that at least one of the pipes to be joined together later consists of a suitable solder-plated material and is provided with Nocolok flux at the points to be soldered. Either both pipes or only one can be plated accordingly. It is also possible to plate the turbulence insert.

In Weiterbildung der Erfindung kann jeder wulstartige Bund aus dem Material des Rohres kurz vor dessen Ende in der Art einer umlaufenden Sicke herausgedrückt sein. Möglich ist es dabei, daß jedes Rohr nur an einem Ende mit einem Wulst versehen wird, wobei die Wülste dann beim Ineinanderstecken der Rohre einander gegenüberliegen und zwischen sich den Strömungskanal einschließen. Möglich ist es aber auch, nur ein Rohr mit zwei Wulsten zu versehen und das andere Rohr glatt zu lassen. Auch ein Rollieren zur Bildung der Wülste ist möglich.In a development of the invention, each bead-like collar can be pressed out of the material of the tube in the manner of a circumferential bead just before its end. It is possible for each tube to be provided with a bead at only one end, the beads then being opposite one another when the tubes are inserted into one another and enclosing the flow channel between them. However, it is also possible to provide only one tube with two beads and to leave the other tube smooth. Rolling to form the beads is also possible.

Bei der Herstellung eines Doppelrohrwärmetauschers der vorher genannten Art hat sich ein Verfahren als besonders vorteilhaft erwiesen, bei dem an mindestens einem der Rohre zunächst im Bereich der Enden aus dem Rohrmaterial bundartige Wülste herausgedrückt werden, dann mindestens eines der Rohre vor oder nach dem Herausdrücken der Wülste oder gegebenenfalls auch die Turbulenzeinlage mit einem Nocolok-Flußmittel beaufschlagt wird, dann die beiden Rohre übereinandergeschoben und durch die Wülste auf Abstand gehalten werden, wonach dann die so aneinandergehaltenen Rohre zum Zweck des Verlötens erhitzt werden.In the manufacture of a double-tube heat exchanger of the aforementioned type, a method has proven to be particularly advantageous in which at least one of the tubes is first pressed out in the region of the ends of the tube-like beads, then at least one of the tubes before or after the beads are pressed out or, if necessary, the turbulence insert is charged with a Nocolok flux, then the two tubes are pushed over one another and kept at a distance by the beads, after which the tubes held together are heated for the purpose of soldering.

Der neue Doppelrohrwärmetauscher eignet sich besonders als Ölkühler zum Einbau in einen Wasserkasten eines Kühlers für einen Kraftfahrzeugmotor.The new double tube heat exchanger is particularly suitable as an oil cooler for installation in a water tank of a cooler for a motor vehicle engine.

Die Erfindung ist anhand von Ausführungsbeispielen in der Zeichnung dargestellt und wird im folgenden erläutert. Es zeigen:

Fig. 1
einen Doppelrohrwärmetauscher nach der Erfindung in einer ersten Ausführungsform,
Fig. 2
eine vergrößerte Darstellung des linken Endes des Wärmetauschers der Fig. 1,
Fig. 3
einen Doppelrohrwärmetauscher nach der Erfindung in einer zweiten Ausführungsform,
Fig. 4
eine Detaildarstellung des linken Endes eines Doppelrohrwärmetauscher in einer dritten Variante,
Fig. 5
einen in den Sammelkasten eines Kühlers eines Kraftfahrzeugmotors integrierten Doppelrohrkühler nach der Erfindung und
Fig. 6
eine Variante eines in einen Sammelkasten nach Fig. 5 eingebauten Doppelrohrkühlers.
The invention is illustrated in the drawing using exemplary embodiments and is explained below. Show it:
Fig. 1
a double tube heat exchanger according to the invention in a first embodiment,
Fig. 2
2 shows an enlarged illustration of the left end of the heat exchanger of FIG. 1,
Fig. 3
a double tube heat exchanger according to the invention in a second embodiment,
Fig. 4
a detailed representation of the left end of a double tube heat exchanger in a third variant,
Fig. 5
a double tube cooler integrated into the header of a radiator of a motor vehicle engine according to the invention and
Fig. 6
a variant of a double tube cooler installed in a collecting tank according to FIG. 5.

In der Fig. 1 ist ein als Doppelrohrölkühler ausgebildeter Doppelrohrwärmetauscher gezeigt, der aus einem Außenrohr (1) und einem Innenrohr (2) jeweils aus lotplattiertem Aluminium besteht. Die Rohre sind dabei aus einem nach dem Plattieren zur Rohrform gebogenen und mit einer Längs-Schweißnaht zusammengefügten Flachmaterial hergestellt. Auf das Außenrohr sind dabei in an sich bekannter Weise zwei Anschlußstutzen (3 und 4) aufgesetzt, durch die im Sinn der Pfeile (5) Öl, beispielsweise heißes Motor- oder Getriebeöl, in einen ringförmigen Strömungskanal (6) zwischen Außenrohr und Innenrohr (1 bzw. 2) geführt werden kann, das durch ein zweites Wärmetauschmedium, im Ausführungsbeispiel Wasser, gekühlt werden soll, das durch das Innenrohr (2) geführt wird und im Sinn des Pfeiles (7) in jenes eintritt. In dem ringförmigen Strömungskanal (6) zwischen den Rohren (1 und 2) strömt das Öl durch den Einlaßstutzen (3) und durch eine nicht näher gezeigte Eintrittsöffnung im Rohr (1) ein und verläßt diesen Strömungskanal durch den Auslaßstutzen (4) und durch eine ebenfalls nicht näher gezeigte Öffnung im Außenrohr (1). Der Strömungskanal (6) ist mit einer Turbulenzeinlage (8) versehen, die in bekannter Weise ausgebildet ist. Der Strömungskanal (6) wird nach außen durch einen umlaufenden wulstartigen Bund (9) begrenzt, der in der Form einer umlaufenden Sicke (siehe auch Fig. 2) aus dem Innenrohr (2) im Bereich des linken Endes (2a) desselben herausgedrückt ist. Die Höhe (h) (Fig. 2) dieses Bundes (9) entspricht dabei der Differenz der Radien (r1) der inneren Wand des Außenrohres (1) und dem Radius (r2) der Außenwand des Innenrohres (2), wobei ein Spiel in der Größenordnung von 1/10 - 2/10 mm verbleibt, um bei der Montage das Ineinanderschieben der Rohre leicht zu ermöglichen und ein Abschaben der Flußmittel- bzw. Lötschicht bei diesem Vorgang zu vermeiden.1 shows a double-tube heat exchanger designed as a double-tube oil cooler, which consists of an outer tube (1) and an inner tube (2) each made of solder-plated aluminum. The tubes are made from a flat material bent after plating and joined with a longitudinal weld. Two connecting pieces (3 and 4) are placed on the outer tube in a manner known per se, through which oil, for example hot engine or gear oil, in the direction of the arrows (5) into an annular flow channel (6) between the outer tube and the inner tube (1 or 2) can be performed, which is to be cooled by a second heat exchange medium, in the exemplary embodiment water, which is guided through the inner tube (2) and enters it in the direction of the arrow (7). In the annular flow channel (6) between the pipes (1 and 2), the oil flows through the inlet connection (3) and through an inlet opening (not shown) in the pipe (1) and leaves this flow channel through the outlet connection (4) and through one also not shown opening in the outer tube (1). The flow channel (6) is provided with a turbulence insert (8) which is designed in a known manner. The flow channel (6) is delimited on the outside by a circumferential bead-like collar (9) which is pressed out in the form of a circumferential bead (see also FIG. 2) from the inner tube (2) in the region of the left end (2a) thereof. The height (h) (Fig. 2) of this collar (9) corresponds to the difference between the radii (r 1 ) of the inner wall of the outer tube (1) and the radius (r 2 ) of the outer wall of the inner tube (2), a Clearance of the order of 1/10 - 2/10 mm remains in order to easily allow the pipes to be pushed into one another during assembly and to avoid scraping off the flux or solder layer during this process.

Bei der Herstellung des Doppelrohrölkühlers der Fig. 1 wird so vorgegangen, daß zunächst das Innenrohr (2) im Bereich seiner beiden Enden mit den sickenförmig herausgedrückten Bunden (9 bzw. 10) versehen wird. Das Innenrohr (2) oder das Außenrohr (1) werden dann mit Flußmittel versehen und nach dem Anordnen der Turbulenzeinlage (8) zwischen den Bunden (9 und 10) wird das Außenrohr (1) axial aufgeschoben. Es wird dann in der Regel noch ein Aufweiten des Innenrohres (2) vorgesehen werden, um das Turbulenzblech (8) in dem ringförmigen Strömungskanal (6) in eine verlötbare Anlage an den Rohrwandungen zu bringen. Danach wird die so hergestellte Anordnung im Lötofen auf die notwendige Temperatur erhitzt, so daß dichte Lötstellen im Bereich der Bunde (9 und 10) und natürlich auch im Bereich der aufgesetzten Anschlußstutzen (3 und 4) entstehen. Nach dem Abkühlen ist der Doppelrohrwärmetauscher fertig.In the manufacture of the double-tube oil cooler of FIG. 1, the procedure is such that the inner tube (2) is first provided with the beads (9 or 10) pressed out in the region of its two ends. The inner tube (2) or the outer tube (1) are then provided with flux and after the turbulence insert (8) has been arranged between the collars (9 and 10), the outer tube (1) is pushed open axially. An expansion of the inner tube (2) will then generally be provided in order to bring the turbulence plate (8) in the annular flow channel (6) into a solderable system on the tube walls. Thereafter, the arrangement thus produced is heated to the necessary temperature in the soldering furnace, so that dense solder joints are formed in the region of the bundles (9 and 10) and, of course, also in the region of the attached connecting pieces (3 and 4). After cooling, the double tube heat exchanger is ready.

Es ist auch möglich, eine beidseitig lotplattierte Turbulenzeinlage (8) im Bereich des Strömungskanals ausschließlich mit Flußmittel zu beaufschlagen. In diesem Fall werden dann nur noch die äußeren Ringspalte der Rohre mit Flußmittel bepinselt. Das zum Erreichen eines dichten Doppelrohrkühlers notwendige Lot kommt dabei (größtenteils) von dem entsprechenden lotplattierten Rohr.It is also possible to apply a flux coating to a turbulence insert (8) soldered on both sides in the region of the flow channel. In this case, only the outer annular gaps of the pipes are then brushed with flux. The solder required to achieve a sealed double-pipe cooler comes (for the most part) from the corresponding solder-plated pipe.

Die Fig. 3 zeigt eine Abwandlung insofern, als hier das Außenrohr (1') im Bereich seines rechten Endes mit einem sickenartig nach innen gedrückten umlaufenden Bund (10') versehen ist, während das Innenrohr (2) ausschließlich an seinem linken Ende mit dem nach außen gerichteten Bund (9) versehen ist. Beide Bunde (9 und 10') sind dabei so, wie der Bund (9) und wie vorher beschrieben, dimensioniert, so daß sich bei der Herstellung, die Turbulenzeinlage (8) in Rohrform auf das Innenrohr (2) aufschieben läßt, bis sie am Bund (9) zur Anlage kommt. Danach kann das Außenrohr (1') axial von rechts nach links, d.h. in Richtung des Pfeiles (7) auf das Innenrohr (2) und auf die Turbulenzeinlage (8) aufgeschoben werden, bis die Rohrenden fluchten. Der Lötvorgang wird dann in der gleichen Weise durchgeführt, wie vorher erläutert. Diese Ausführungsform weist den Vorteil auf, daß sich auch die Turbulenzeinlage axial aufschieben läßt, so daß eine verhältnismäßig einfache Montage möglich wird.Fig. 3 shows a modification insofar as here the outer tube (1 ') is provided in the region of its right end with a circumferential collar (10') pressed inwards like a bead, while the inner tube (2) is only provided at its left end with the outward collar (9) is provided. Both bundles (9 and 10 ') are dimensioned as the collar (9) and as previously described, so that during manufacture, the turbulence insert (8) in tube form can be pushed onto the inner tube (2) until it comes into contact with the collar (9). The outer tube (1 ') can then be pushed axially from right to left, ie in the direction of arrow (7) onto the inner tube (2) and onto the turbulence insert (8). until the pipe ends are aligned. The soldering process is then carried out in the same manner as previously explained. This embodiment has the advantage that the turbulence insert can also be pushed on axially, so that a relatively simple assembly is possible.

Die Fig. 4 zeigt eine Variante insofern, als hier ein glattes Außenrohr (1) (wie in Fig. 1) vorgesehen ist, daß jedoch das Innenrohr (2') an seinem linken Ende einen nach außen rollierten Bund (11) aufweist, dessen Abmessungen jenen des Bundes (9) entsprechen. Auch durch diesen rollierten Bund (11) wird eine Anlage und Führung des Außenrohres (1) bei der Montage erreicht. Gleichzeitig dient dieser Bund (11) als Abdichtstelle nach dem Lötvorgang. Auch bei dieser Ausführungsform kann das Innenrohr (2') an beiden Enden mit einem nach außen rollierten Bund (11) versehen werden. Möglich ist auch die Anordnung nur des gezeigten linken rollierten Bundes (11), während das Außenrohr (1) einen nach innen rollierten Bund an der rechten Seite aufweist, so daß eine Montage wie in Fig. 3 möglich ist. Schließlich ist natürlich auch noch die Variante denkbar, daß das Außenrohr (2) nach innen rollierte Bunde aufweist, wie das im Prinzip aber auch bei der Ausführungsform nach Fig. 1 in der technischen Umkehrung möglich ist, bei der die Bunde (9 und 10) nicht vom Innenrohr nach außen, sondern vom Außenrohr (1) nach innen gerichtet sind.Fig. 4 shows a variant in that here a smooth outer tube (1) (as in Fig. 1) is provided, but that the inner tube (2 ') has at its left end an outwardly rolled collar (11), the Dimensions correspond to those of the federal government (9). This rolled collar (11) also allows the outer tube (1) to be placed and guided during assembly. At the same time, this collar (11) serves as a sealing point after the soldering process. In this embodiment, too, the inner tube (2 ') can be provided with an outwardly rolled collar (11) at both ends. It is also possible to arrange only the left rolled collar (11) shown, while the outer tube (1) has an inwardly rolled collar on the right side, so that assembly as in FIG. 3 is possible. Finally, of course, the variant is also conceivable that the outer tube (2) has bundles rolled inwards, as is also possible in principle in the technical reversal in the embodiment according to FIG. 1, in which the bundles (9 and 10) are not directed outwards from the inner tube, but inwards from the outer tube (1).

Alle Ausführungsformen sichern eine einfache Montage zu und eignen sich besonders für die Herstellung des Doppelrohrwärmetauschers aus Aluminium und für die Verlötung durch das Nocolok-Verfahren.All of the embodiments ensure simple installation and are particularly suitable for the production of the double tube heat exchanger made of aluminum and for the soldering using the Nocolok process.

In den Fig. 5 und 6 ist eine vorteilhafte Ausgestaltung der neuen Doppelrohrwärmetauscher insofern gezeigt, als die Doppelrohrwärmetauscher dort als Ölkühler unmittelbar in einen der Sammelkästen des Kühlers für die Motorkühlflüssigkeit eingebaut sind.5 and 6, an advantageous embodiment of the new double-tube heat exchanger is shown in that the double-tube heat exchanger is installed there directly as an oil cooler in one of the cooler sumps for the engine coolant.

In der Fig. 5 ist zu diesem Zweck ein Doppelrohrkühler (12) nach der Erfindung unmittelbar in einen Sammelkasten (13) eines nicht näher gezeigten - weil bekannten - Kühlmittelkühlers für einen Kraftfahrzeugmotor eingebaut. Dabei wird in bekannter Weise der Sammelkasten (13) von seinem unteren Ende (13a) von einem nicht gezeigten Rohrboden abgeschlossen und es findet daher längs der Achsen (14) der in den Rohrboden mündenden, aber ebenfalls nicht gezeigten Rohre, eine Anströmung des Außenrohres (1) des Doppelrohrölkühlers (12) statt. Die Strömung des Kühlmittels durchsetzt auch - bei geeigneter Anordnung des Doppelrohrkühlers zum Zu- oder Rücklaufstutzen des Sammelkastens (13 - den Innenraum des Innenrohres (2).5, for this purpose, a double-tube cooler (12) according to the invention is installed directly in a collecting tank (13) of a coolant cooler for a motor vehicle engine, which is not shown in detail because it is known. In a known manner, the collecting box (13) is closed from its lower end (13a) by a tube sheet (not shown) and therefore there is a flow against the outer tube (14) of the tubes opening into the tube sheet but also not shown ( 1) of the double tube oil cooler (12) instead. The flow of the coolant also passes through the interior of the inner tube (2) if the double-tube cooler is suitably arranged for supply or return connection of the collecting tank (13).

Bei dem gezeigten Ausführungsbeispiel ist das Außenrohr (1) an mindestens zwei Stellen mit einer Öffnung (15) versehen worden und man hat dann den Rand dieser Bohrung mit üblichen Mitteln kragenartig nach außen gezogen und in Form des Bördelrandes (16) um eine Öffnung im Sammelkasten (13) herumgebördelt. Auf die Öffnung (15) im Außenrohr (2) und im Sammelkasten (13) ist dann ein Anschlußstutzen (3') aufgesetzt worden, der ebenso wie der umgebördelte Rand (16) mit dem Sammelkasten (13) dicht verlötet ist.In the exemplary embodiment shown, the outer tube (1) has been provided with an opening (15) at at least two points and the edge of this hole has then been pulled out in a collar-like manner by conventional means and in the form of the flanged edge (16) around an opening in the collecting box (13) crimped around. A connection piece (3 ') is then placed on the opening (15) in the outer tube (2) and in the collecting box (13), which, like the flanged edge (16), is tightly soldered to the collecting box (13).

Zu diesem Zweck besteht beim Ausführungsbeispiel der Sammelkasten (13) ebenfalls aus einem lotplattierten Aluminium, so daß es für die Herstellung genügt, das geeignete Flußmittel im Bereich des Randes (16) und im Bereich der aufsitzenden Backen des Anschlusses (3') aufzubringen, um mit dem Nocolok-Verfahren eine vollständige dichte Verlötung des Doppelrohrkühlers (12) (wie er auch in den vorhergehenden Figuren erläutert ist) und der Verbindung zwischen diesem Doppelrohrkühler und dem Sammelkasten (13) und dessen Anschlußstutzen (3') herzustellen. Dem Außenrohr (1) wird natürlich außer der Öffnung (15) mit dem Anschlußstutzen (3') auch noch eine weitere, in Fig. 5 nicht gezeigte Öffnung zugeordnet, die in gleicher Weise am Sammelkasten (13) befestigt und mit diesem verlötet wird, so daß, wie auch bei den Beispielen der Fig. 1 bis 4, durch den Anschlußstutzen (3') das zu kühlende Öl in den Zwischenraum zwischen Außenrohr (1) und Innenrohr (2) zugeführt und durch den nicht gezeigten Anschlußstutzen wieder abgeführt werden kann.For this purpose, the collecting box (13) in the exemplary embodiment also consists of a solder-plated aluminum, so that it is sufficient for the production to apply the suitable flux in the region of the edge (16) and in the region of the seated jaws of the connection (3 ') in order to with the Nocolok process, a complete tight soldering of the double tube cooler (12) (as is also explained in the previous figures) and the connection between this double tube cooler and the header box (13) and its connection piece (3 '). In addition to the opening (15) with the connecting piece (3 '), the outer tube (1) is of course also assigned a further opening, not shown in FIG. 5, which is fastened in the same way to the collecting box (13) and with it is soldered so that, as in the examples of FIGS. 1 to 4, the oil to be cooled is fed into the space between the outer tube (1) and inner tube (2) through the connecting piece (3 ') and again through the connecting piece (not shown) can be dissipated.

Der Vorteil der in der Fig. 5 gezeigten Ausführungsform ist, daß ein ausschließlich aus Aluminium hergestellter Kühler mit einem Doppelrohrölkühler zur Verfügung gestellt werden kann, an dem keine anderen Materialien verwendet werden, so daß ein einfaches Recycling möglich ist.The advantage of the embodiment shown in FIG. 5 is that a cooler made exclusively of aluminum can be provided with a double-tube oil cooler, on which no other materials are used, so that simple recycling is possible.

Die Fig. 6 zeigt eine Ausführungsform weitgehend ähnlich jener der Fig. 5. Unterschiedlich ist nur, daß hier der von der Öffnung (15) aus nach außen gezogene Hals (17) des Doppelrohrkühlers (12') nicht um den Rand einer entsprechenden Öffnung im Sammelkasten (13') herumgebördelt, sondern in eine entsprechende Aussparung (18) des Anschlußstutzens (3'') hereingedrückt ist. Dieser Hals (17) kann auch noch in die Nut (19) innerhalb des Anschlußstutzens (3'') hereingedrückt werden. Auch diese Ausführungsform ermöglicht, da der gesamte Kühler einschließlich Doppelrohrkühler aus Aluminium besteht, ein einwandfreies Recycling.Fig. 6 shows an embodiment largely similar to that of Fig. 5. The only difference is that here the neck (17) of the double-tube cooler (12 ') drawn outwards from the opening (15) does not extend around the edge of a corresponding opening in the Collection box (13 ') flanged around, but is pressed into a corresponding recess (18) of the connecting piece (3' '). This neck (17) can also be pressed into the groove (19) within the connecting piece (3 ''). This embodiment also enables perfect recycling since the entire cooler, including the double tube cooler, is made of aluminum.

Der Sammelkasten (13) kann entweder - wie in Fig. 5 und 6 dargestellt - halbschalenförmig ausgebildet und mit einem zusätzlichen Metallboden verlötet sein oder auch einstückig aus einem lotplattierten Rohr oder aus zwei miteinander verlöteten Halbschalen hergestellt sein.The collecting box (13) can either - as shown in FIGS. 5 and 6 - be half-shell-shaped and soldered to an additional metal base, or it can be made in one piece from a solder-plated tube or from two half-shells soldered to one another.

Claims (14)

Doppelrohrwärmetauscher, bestehend aus zwei koaxial ineinandergesetzten Rohren (1, 2) bzw. (1', 2'), insbesondere aus lotplattiertem Aluminium, die an ihren Enden miteinander zur Bildung eines zwischen ihnen liegenden Strömungskanales (6) dicht verbunden sind, wobei in den Strömungskanal gegebenenfalls eine Turbulenzeinlage (8) eingesetzt ist, dadurch gekennzeichnet, daß an beiden Enden der Rohre (1, 2 bzw. 1', 2') mindestens ein von mindestens einem der Rohre abragender umlaufender wulstartiger Bund (9, 10 bzw. 10', 11) vorgesehen ist, dessen Höhe der Differenz der Radien (r1, r2) der Innenwand des äußeren und der Außenwand des inneren Rohres entspricht und daß die Bunde gegebenenfalls mit der Turbulenzeinlage (8) dicht mit der Rohrwand verlötet sind, an der sie anliegen.Double tube heat exchanger, consisting of two coaxially nested tubes (1, 2) or (1 ', 2'), in particular made of solder-plated aluminum, which are tightly connected at their ends to form a flow channel (6) between them, in which Flow channel, if necessary, a turbulence insert (8) is used, characterized in that at both ends of the tubes (1, 2 or 1 ', 2') at least one circumferential, bulging collar (9, 10 or 10 ') projecting from at least one of the tubes , 11) is provided, the height of which corresponds to the difference between the radii (r 1 , r 2 ) of the inner wall of the outer and the outer wall of the inner tube and that the collars are optionally soldered to the tube wall with the turbulence insert (8) on which they concern. Doppelrohrwärmetauscher nach Anspruch 1, dadurch gekennzeichnet, daß jeder wulstartige Bund (9, 10, 10', 11) aus dem Material des Rohres herausgedrückt ist.Double tube heat exchanger according to claim 1, characterized in that each bead-like collar (9, 10, 10 ', 11) is pressed out of the material of the tube. Doppelrohrwärmetauscher nach Anspruch 2, dadurch gekennzeichnet, daß jeder Bund (9, 10, 10') kurz vor dem Ende des Rohres in der Art einer umlaufenden Sicke herausgedrückt ist.Double tube heat exchanger according to claim 2, characterized in that each collar (9, 10, 10 ') is pressed out in the manner of a circumferential bead just before the end of the tube. Doppelrohrwärmetauscher nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß jedes Rohr (1 bzw. 2) nur mit einem Wulst (9 bzw. 10') versehen ist.Double tube heat exchanger according to one of claims 1 to 3, characterized in that each tube (1 or 2) is provided with only one bead (9 or 10 '). Doppelrohrwärmetauscher nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß ein Rohr (1) glatt, das andere jedoch an seinen beiden Enden mit je einem Wulst (9, 10) ausgebildet ist.Double tube heat exchanger according to one of claims 1 to 3, characterized in that one tube (1) is smooth, but the other is formed at its two ends with a bead (9, 10). Doppelrohrwärmetauscher nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Bund (11) durch Einrollen des Endes des Rohres (2') hergestellt ist.Double tube heat exchanger according to claim 1 or 2, characterized in that the collar (11) is produced by rolling the end of the tube (2 '). Verfahren zur Herstellung eines Doppelrohrwärmetauschers nach Anspruch 1, dadurch gekennzeichnet, daß mindestens eines der Rohre aus einem lotplattiertem Material besteht, daß an mindestens einem der Rohre im Bereich der Enden aus dem Rohrmaterial herausgedrückte bundartige Wülste gebildet werden, deren Höhe der Differenz der Radien der Innenwand des äußeren und der Außenwand des inneren Rohres entspricht, daß mindestens eines der Rohre vor oder nach dem Herausdrücken der Wülste oder gegebenenfalls die ebenfalls lotplattierte Turbulenzeinlage (8) mit einem Hartlöt-Flußmittel versehen wird, dann die beiden Rohre übereinandergeschoben und durch die Wülste auf Abstand gehalten werden und daß die so aneinandergehaltenen Rohre zum Zweck des Verlötens erhitzt werden.A process for producing a double-tube heat exchanger according to claim 1, characterized in that at least one of the tubes is made of a solder-plated material, that at least one of the tubes in the region of the ends is formed with collar-like beads, the height of which is the difference between the radii of the inner wall of the outer and the outer wall of the inner tube corresponds to the fact that at least one of the tubes is provided with a brazing flux before or after the beads are pressed out or the turbulence insert (8), which is also solder-plated, is then pushed over one another and spaced apart by the beads are held and that the tubes held together are heated for the purpose of soldering. Doppelrohrwärmetauscher nach Anspruch 7, dadurch gekennzeichnet, daß als Ausgangsmaterial für die Rohre Aluminium-Bleche mit ein- oder beidseitig aufplattierten Zusatzwerkstoffen mit einem Siliziumgehalt zwischen 7,5% bis 12,5% vorgesehen sind, die zu einer Rohrform verschweißt werden.Double tube heat exchanger according to claim 7, characterized in that aluminum sheets with additional materials plated on one or both sides with a silicon content between 7.5% and 12.5% are provided as the starting material for the tubes, which are welded into a tube shape. Doppelrohrwärmetauscher nach Anspruch 7, dadurch gekennzeichnet, daß als Flußmittel ein handelsübliches Nocolok-Flußmittel verwendet wird.Double tube heat exchanger according to claim 7, characterized in that a commercially available Nocolok flux is used as the flux. Doppelrohrwärmetauscher nach einem der Ansprüche 1 bis 6, gekennzeichnet durch mindestens eine Zu- oder Abflußöffnung (15), mit einem um diese herum aus dem Material nach außen gedrückten Hals (16, 17), der in eine Öffnung eines Sammelkasten (13) eines Motorkühlers eingeschoben und mit diesem dicht verlötet ist.Double tube heat exchanger according to one of claims 1 to 6, characterized by at least one inflow or outflow opening (15), with a neck (16, 17) pressed outward from the material around it, which into an opening of a collecting box (13) of an engine cooler inserted and soldered tightly to it. Doppelrohrwärmetauscher nach Anspruch 10, dadurch gekennzeichnet, daß der Hals (16) um den Rand der Öffnung im Sammelkasten (13) umgebördelt ist und von einem Anschlußstutzen (3') umgeben ist.Double tube heat exchanger according to claim 10, characterized in that the neck (16) is flanged around the edge of the opening in the collecting box (13) and is surrounded by a connecting piece (3 '). Doppelrohrwärmetauscher nach Anspruch 10, dadurch gekennzeichnet, daß der Hals (17) in eine entsprechende Ausnehmung (18, 19) eines Anschlußstutzens (3'') hereingedrückt und darin verlötet ist.Double tube heat exchanger according to claim 10, characterized in that the neck (17) is pressed into a corresponding recess (18, 19) of a connecting piece (3 '') and is soldered therein. Doppelrohrwärmetauscher nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, daß als Material für die Herstellung des Sammelkastens lotplattiertes Aluminium verwendet ist.Double tube heat exchanger according to one of claims 10 to 12, characterized in that solder-clad aluminum is used as the material for the production of the header tank. Doppelrohrwärmetauscher nach Anspruch 10, dadurch gekennzeichnet, daß der Anschlußstutzen (3', 3'') aus Aluminium besteht und in einem Arbeitsgang im Nocolok-Verfahren mit dem Sammelkasten und dem Doppelrohrwärmetauscher verlötet ist.Double tube heat exchanger according to claim 10, characterized in that the connecting piece (3 ', 3' ') consists of aluminum and is soldered to the header box and the double tube heat exchanger in one operation using the Nocolok method.
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DE59606931D1 (en) 2001-06-28
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DE19509788A1 (en) 1996-09-19
EP0732560B1 (en) 2001-05-23

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