EP0660064A2 - Joint for connecting a tube to an end plate in a heat exchanger - Google Patents

Joint for connecting a tube to an end plate in a heat exchanger Download PDF

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Publication number
EP0660064A2
EP0660064A2 EP94118838A EP94118838A EP0660064A2 EP 0660064 A2 EP0660064 A2 EP 0660064A2 EP 94118838 A EP94118838 A EP 94118838A EP 94118838 A EP94118838 A EP 94118838A EP 0660064 A2 EP0660064 A2 EP 0660064A2
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EP
European Patent Office
Prior art keywords
tube
pipe
connection according
tube sheet
weld seam
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Granted
Application number
EP94118838A
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German (de)
French (fr)
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EP0660064A3 (en
EP0660064B1 (en
Inventor
Herbert Dr. Damsohn
Albert Schmitz
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Mahle Behr GmbH and Co KG
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Behr GmbH and Co KG
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Application filed by Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Publication of EP0660064A2 publication Critical patent/EP0660064A2/en
Publication of EP0660064A3 publication Critical patent/EP0660064A3/en
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Publication of EP0660064B1 publication Critical patent/EP0660064B1/en
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    • 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
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding

Definitions

  • the invention relates to a tube-bottom connection for a heat exchanger with a tube block through which a heat exchange medium flows and with aluminum tubes running parallel to one another, which are held at least at one end in an aluminum tube plate adjacent to a collecting space and are connected tightly thereto, in particular a cooler for automotive engines.
  • the invention is therefore based on the object of designing a pipe-floor connection of the type mentioned at the outset in such a way that the requirements for mechanical stability and tightness are met.
  • the invention is based on a tube-bottom connection of the type mentioned in that the tube ends inserted into the tube sheet are welded to the tube sheet by a laser weld seam running over their entire circumference, the inner contour of which is flush with the inner tube wall and into the interior of the collecting space facing side of the tube sheet merges.
  • the openings in the tube sheet are initially designed such that the pipe ends are held largely without gaps in the openings, so that the pipe ends are then pushed into their assigned openings, that they run flush to the sides of the tube plate adjacent to the collecting space, and that the laser welding is then carried out by a laser beam guided along the circumference of the tube ends.
  • This laser beam works one pipe after the other and is guided for this purpose according to the dimensions of the tube sheet and the pipes from pipe to pipe and then along the circumference of the pipe.
  • the laser welding can also be carried out under protective gas, using a pulsed ND / YAG laser.
  • the pipe-floor connection according to the invention for the heat exchanger serving as a cooler for motor vehicle engines consists of a plurality of flat pipes (1) which are arranged in a manner known per se and in a manner not shown and provided with a network of cooling fins
  • the tubes are aligned with their axis (4) perpendicular to the tube diode (2). They have a wall thickness (s) which, in the exemplary embodiment, is substantially less than the thickness (b) of the tube sheet (2).
  • the thickness (b) is approximately three times the wall thickness (s) of the pipes (1).
  • the tubes (1) are connected to this tube sheet (2) via a weld seam (3) running along their entire circumference with the tube sheet (2), which, as shown in FIG. 3, has an approximately oval cross section with pointed ends, the Longitudinal axis (5) runs at approximately 45 ° to the tube sheet (2) and to the tube axes (4).
  • the weld seam (3) which was generated by a laser beam, extends from the side (2a) of the tube sheet (2) facing a collecting space (not shown) for the heat exchange medium to below the underside (2b) thereof. It has a rounded inner contour (6) facing the pipe mouth, each tangent into the Side wall (2a) of the tube sheet (2) or in the inner wall (1a) of the tubes (1) merges.
  • the weld seam therefore forms a kind of inlet funnel at the mouth of the pipes. At no point does it project beyond the inner wall (2a).
  • the laser beam therefore processes all tubes (1) one after the other on the side that is flush with the tube sheet (2).
  • the weld seam is then given the shape shown in FIG. 3.
  • point (8) measured at an angle of 45 °, which the bisector between the underside (2b) of the tube sheet (2) and the outer wall of the tube sheet (1) occupies, it is greater than the wall thickness (s) of the tube (1); (a) is therefore larger than (s).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Laser Beam Processing (AREA)

Abstract

2.1 In tube/tube plate joints, in particular made from aluminium, problems arise with reference to the required tightness. As a rule, the tubes are soldered in passages in the plate and subsequently sealed with silicon. 2.2 It is proposed that the tube ends pushed into the tube plate be welded to the tube plate by means of a laser welded seam which extends over their entire circumference and whose inner contour merges in a flush fashion into the inner tube wall and into the side of the tube plate pointing into the interior of the collecting chamber. It is possible thereby to achieve the necessary mechanical retention and the required tightness. 2.3 Use for the radiators of motor vehicle engines. <IMAGE>

Description

Die Erfindung betrifft eine Rohr-Bodenverbindung für einen Wärmetauscher mit einem von einem Wärmetauschmedium durchströmten Rohrblock mit parallel zueinander verlaufenden Rohren aus Aluminium, die mindestens mit einem Ende in einem an einen Sammelraum angrenzenden Rohrboden aus Aluminium gehalten und mit diesem dicht verbunden sind, insbesondere einen Kühler für Kraftfahrzeugmotoren.The invention relates to a tube-bottom connection for a heat exchanger with a tube block through which a heat exchange medium flows and with aluminum tubes running parallel to one another, which are held at least at one end in an aluminum tube plate adjacent to a collecting space and are connected tightly thereto, in particular a cooler for automotive engines.

Die Rohr-Bodenverbindungen für Wärmetauscher, insbesondere für die Kühler von Kraftfahrzeugmotoren, aber auch für Kondensatoren, Verdampfer oder Ladeluftkühler, sind immer mit gewissen Problemen behaftet, weil die in die Rohrböden eingefügten Rohrenden zum einen mechanisch festsitzen müssen und zum anderen aber auch die notwendige Dichtheit erzielt werden muß, um Verluste des Wärmetauschmediums zu vermeiden. Für Wärmetaucher mit Aluminiumrohren und Aluminiumboden ist es bekannt, die Rohre in sogenannte Durchzüge des Bodens einzufügen und zu verlöten. In der Regel muß anschließend aber noch ein gesonderter Abdichtvorgang unter Verwendung von Silikon durchgeführt werden. Dies setzt zum einen verhältnismäßig aufwendige Arbeitsvorgänge für das Verlöten voraus und, weil gelötete Wärmetauscher nicht die notwendige Dichtheit erzielen, einen anschließenden Reinigungsvorgang mit umweltunverträglichen Mitteln, sowie danach den Vorgang der Silikonisierung.The pipe-floor connections for heat exchangers, especially for the coolers of motor vehicle engines, but also for condensers, evaporators or charge air coolers, are always fraught with certain problems because the pipe ends inserted into the pipe bottoms have to be mechanically tight on the one hand and the necessary tightness on the other hand must be achieved in order to avoid losses of the heat exchange medium. For heat divers with aluminum tubes and aluminum base, it is known to insert and solder the tubes into so-called passages in the base. As a rule, however, a separate sealing process must then be carried out using silicone. On the one hand, this requires relatively complex work processes for soldering and because soldered heat exchangers are not achieve the necessary tightness, a subsequent cleaning process with environmentally incompatible agents, and then the process of siliconization.

Bekannt ist es auch, die in Durchzügen des Rohrbodens eingefügten Rohrenden mechanisch aufzuweiten und eine Gummidichtung vorzusehen. Hier treten Probleme durch das Einreißen der aufzuweitenden Rohrenden und durch verschobene Dichtungen auf, insbesondere wenn keine runden Rohrquerschnitte vorliegen. Hier gestaltet sich die Abdichtung besonders schwer.It is also known to mechanically widen the pipe ends inserted in passages of the tube sheet and to provide a rubber seal. Problems arise due to tearing of the pipe ends to be widened and due to displaced seals, especially if there are no round pipe cross sections. The sealing is particularly difficult here.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Rohr-Bodenverbindung der eingangs genannten Art so auszubilden, daß die Forderungen nach mechanischem Halt und Dichtheit erfüllt sind.The invention is therefore based on the object of designing a pipe-floor connection of the type mentioned at the outset in such a way that the requirements for mechanical stability and tightness are met.

Die Erfindung besteht ausgehend von einer Rohr-Bodenverbindung der eingangs genannten Art darin, daß die in den Rohrboden eingeschobenen Rohrenden durch eine über ihren gesamten Umfang verlaufende Laserschweißnaht mit dem Rohrboden verschweißt sind, deren Innenkontur bündig in die Rohrinnenwandung und in die in das Innere des Sammelraumes weisende Seite des Rohrbodens übergeht.The invention is based on a tube-bottom connection of the type mentioned in that the tube ends inserted into the tube sheet are welded to the tube sheet by a laser weld seam running over their entire circumference, the inner contour of which is flush with the inner tube wall and into the interior of the collecting space facing side of the tube sheet merges.

Durch diese Ausgestaltung wird es möglich, nur durch einen Arbeitsgang sowohl den notwendigen mechanischen Halt als auch die erforderliche Dichtheit zu erreichen. Zusätzliche Arbeitsvorgänge für ein Silikonisieren oder zusätzliches Einlegen von Dichtungen werden überflüssig. Es hat sich auch gezeigt, daß es durch die Erfindung in einfacher Weise möglich wird, auch Rohre mit komplizierten Querschnitten, insbesondere Flachrohre mit ovalem oder elliptischem Querschnitt oder Mehrkammerprofile, ausreichend fest und dicht mit dem Rohrboden zu verschweißen. Der Rohrboden selbst braucht keine Durchzüge mehr aufzuweisen. Es ist lediglich notwendig, die Öffnungen im Rohrboden entsprechend genau an den Rohrquerschnitt anzupassen. Schließlich stellt die erfindungsgemäß hergestellte Schweißnaht auch keinen Widerstand für die Strömung im Wärmetauscher dar, weil kein Rohrüberstand wie beim Stand der Technik mehr vorliegt. Dadurch kann auch Rohrmaterial eingespart werden.This configuration makes it possible to achieve both the necessary mechanical hold and the required tightness in just one work step. Additional operations for siliconizing or inserting seals are no longer necessary. It has also been shown that the invention makes it possible in a simple manner to weld tubes with complicated cross sections, in particular flat tubes with oval or elliptical cross section or multi-chamber profiles, sufficiently firmly and tightly to the tube sheet. The tube sheet itself no longer has to have passages. It is only necessary to adapt the openings in the tube sheet to the tube cross-section. After all the weld seam produced according to the invention also does not represent any resistance to the flow in the heat exchanger because there is no longer a pipe protrusion as in the prior art. This also saves pipe material.

Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet. Hervorzuheben ist auch noch, daß es durch die Erfindung in sehr einfacher Weise möglich wird, Rohrböden mit wesentlich größerer Stärke mit den Rohren zu verbinden.Developments of the invention are characterized in the subclaims. It should also be emphasized that the invention makes it possible, in a very simple manner, to connect tube sheets with much greater strength to the tubes.

Zur Herstellung einer Rohr-Bodenverbindung nach der Erfindung hat es sich als besonders vorteilhaft erwiesen, wenn die Öffnungen im Rohrboden zunächst so ausgelegt werden, daß die Rohrenden weitgehend spaltfrei in den Öffnungen gehalten sind, daß die Rohrenden dann in ihre zugeordneten Öffnungen so eingeschoben werden, daß sie bündig zu der an den Sammelraum angrenzenden Seiten des Rohrbodens verlaufen, und daß dann die Laserschweißung durch einen entlang des Umfanges der Rohrenden geführten Laserstrahl erfolgt. Dieser Laserstrahl arbeitet dabei ein Rohr nach dem anderen ab und wird zu diesem Zweck entsprechend den Abmessungen des Rohrbodens und der Rohre von Rohr zu Rohr und dann entsprechend am Umfang des Rohres entlanggeführt.For the production of a pipe-bottom connection according to the invention, it has proven to be particularly advantageous if the openings in the tube sheet are initially designed such that the pipe ends are held largely without gaps in the openings, so that the pipe ends are then pushed into their assigned openings, that they run flush to the sides of the tube plate adjacent to the collecting space, and that the laser welding is then carried out by a laser beam guided along the circumference of the tube ends. This laser beam works one pipe after the other and is guided for this purpose according to the dimensions of the tube sheet and the pipes from pipe to pipe and then along the circumference of the pipe.

Für die Herstellung ist es auch sehr vorteilhaft, wenn der Fügespalt zwischen den Rohrenden und den zugeordneten Öffnungen des Rohrbodens ringsum kleiner als 0,1 mm ist. Die Laserschweißung kann ferner unter Schutzgas erfolgen, und zwar mit einem gepulsten ND/YAG-Laser.It is also very advantageous for the production if the joint gap between the pipe ends and the associated openings of the pipe base is smaller than 0.1 mm all around. The laser welding can also be carried out under protective gas, using a pulsed ND / YAG laser.

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

Fig. 1
Den Ausschnitt einer Draufsicht auf einen Rohrboden eines Kühlers für einen Kraftfahrzeugmotor mit eingeschweißten Rohren mit Ovalquerschnitt,
Fig. 2
in vergrößerter Darstellung den Schnitt durch eine Rohrbodenverbindung längs der Schnittlinie III-III in Fig. 1, jedoch noch vor dem Schweißvorgang, und
Fig. 3
die weitervergrößerte Darstellung des Schnittes III-III der Fig. 1 mit dem eingeschweißten Rohr.
The invention is illustrated in the drawing using an exemplary embodiment and is explained below. Show it:
Fig. 1
The section of a plan view of a tube sheet of a radiator for a motor vehicle engine with welded tubes with an oval cross section,
Fig. 2
in an enlarged view the section through a tube sheet connection along the section line III-III in Fig. 1, but before the welding process, and
Fig. 3
the further enlarged view of section III-III of FIG. 1 with the welded tube.

Aus den Fig. 1 und 3 ist erkennbar, daß die erfindungsgemäße Rohr-Bodenverbindung für den als Kühler für Kraftfahrzeugmotoren dienenden Wärmetauscher zwischen mehreren, in an sich bekannter Weise angeordneten und in nicht dargestellter Weise noch mit einem Netz von Kühlrippen versehenen Flachrohren (1) aus Aluminium und einem Rohrboden (2), ebenfalls aus Aluminium vorgenommen worden ist. Die Rohre sind dabei mit ihrer Achse (4) jeweils senkrecht zu dem Rohrdoden (2) ausgerichtet. Sie besitzen eine Wanddicke (s), die beim Ausführungsbeispiel wesentlich geringer ist als die Dicke (b) des Rohrbodens (2). Die Dicke (b) beträgt etwa das dreifache der Wandstärke (s) der Rohre (1).1 and 3 it can be seen that the pipe-floor connection according to the invention for the heat exchanger serving as a cooler for motor vehicle engines consists of a plurality of flat pipes (1) which are arranged in a manner known per se and in a manner not shown and provided with a network of cooling fins Aluminum and a tube sheet (2), also made of aluminum. The tubes are aligned with their axis (4) perpendicular to the tube diode (2). They have a wall thickness (s) which, in the exemplary embodiment, is substantially less than the thickness (b) of the tube sheet (2). The thickness (b) is approximately three times the wall thickness (s) of the pipes (1).

Die Rohre (1) sind mit diesem Rohrboden (2) über eine längs ihres gesamten Umfanges verlaufende Schweißnaht (3) mit dem Rohrboden (2) verbunden, die, wie Fig. 3 zeigt, einen etwa ovalen Querschnitt mit spitz auslaufenden Enden besitzt, dessen Längsachse (5) etwa unter 45° zum Rohrboden (2) und zu den Rohrachsen (4) verläuft. Die Schweißnaht (3), die durch einen Laserstrahl erzeugt wurde, erstreckt sich dabei von der einem nicht gezeigten Sammelraum für das Wärmetauschmedium zugewandten Seite (2a) des Rohrbodens (2) bis unterhalb von dessen Unterseite (2b). Sie weist eine abgerundete, der Rohrmündung zugewandte Innenkontur (6) auf, die jeweils tangential in die Seitenwand (2a) des Rohrbodens (2) bzw. in die Innenwand (1a) der Rohre (1) übergeht. Die Schweißnaht bildet daher eine Art Einlauftrichter an der Mündungsstelle der Rohre. Sie steht an keiner Stelle über die Innenwand (2a) vor.The tubes (1) are connected to this tube sheet (2) via a weld seam (3) running along their entire circumference with the tube sheet (2), which, as shown in FIG. 3, has an approximately oval cross section with pointed ends, the Longitudinal axis (5) runs at approximately 45 ° to the tube sheet (2) and to the tube axes (4). The weld seam (3), which was generated by a laser beam, extends from the side (2a) of the tube sheet (2) facing a collecting space (not shown) for the heat exchange medium to below the underside (2b) thereof. It has a rounded inner contour (6) facing the pipe mouth, each tangent into the Side wall (2a) of the tube sheet (2) or in the inner wall (1a) of the tubes (1) merges. The weld seam therefore forms a kind of inlet funnel at the mouth of the pipes. At no point does it project beyond the inner wall (2a).

Um diese Form der Schweißnaht zu erreichen, die strömungstechnisch außerordentlich günstig ist, weil kein Rohrüberstand mehr vorliegt, werden alle Rohre (1) zunächst wie in Fig. 2 gezeigt, mit ihren Rohrenden so in zugeordnete Öffnungen (7) des Rohrbodens (2) eingeschoben, daß ihre Enden bündig zu der Seite (2a) verlaufen. Dabei muß der zwischen den Öffnungen (7) und dem Außenumfang der Rohre (1) bestehende Fügespalt (f) so gewählt sein, daß er ringsum kleiner als 0,1 mm ist. Sind die Rohre in dieser Weise ausgerichtet und angeordnet, wird die Schweißnaht (3) mit Hilfe eines gepulsten Nd-YAG-Laserstrahls erzeugt, der von Rohr zu Rohr und dort jeweils längs des gesamten Umfanges des Endes des Rohres (1) von der Seite des Sammenraumes her geführt ist. Der Laserstrahl arbeitet daher nacheinander alle Rohre (1) an der bündig im Rohrboden (2) steckenden Seite ab. Die Schweißnaht erhält dann die in Fig. 3 gezeigte Form. Sie ist an der Stelle (8), gemessen unter einem Winkel von 45°, den die Winkelhalbierene zwischen der Unterseite (2b) des Rohrbodens (2) und der Außenwand des Rohrbodens (1) einnimmt, größer als die Wandstärke (s) des Rohres (1); (a) ist daher größer als (s).In order to achieve this form of the weld seam, which is extremely favorable in terms of flow technology, because there is no longer any pipe protrusion, all pipes (1) are first inserted with their pipe ends into assigned openings (7) in the pipe base (2), as shown in FIG. 2 that their ends are flush with the side (2a). The gap (f) existing between the openings (7) and the outer circumference of the tubes (1) must be selected so that it is less than 0.1 mm all around. If the pipes are aligned and arranged in this way, the weld seam (3) is generated with the aid of a pulsed Nd-YAG laser beam, which runs from pipe to pipe and there along the entire circumference of the end of the pipe (1) from the side of the pipe Entire room is led here. The laser beam therefore processes all tubes (1) one after the other on the side that is flush with the tube sheet (2). The weld seam is then given the shape shown in FIG. 3. At point (8), measured at an angle of 45 °, which the bisector between the underside (2b) of the tube sheet (2) and the outer wall of the tube sheet (1) occupies, it is greater than the wall thickness (s) of the tube (1); (a) is therefore larger than (s).

Diese Form der Schweißnaht, die sich durch die besondere Laser-Schweißung ergibt, gibt der Rohr-Bodenverbindung eine außerordentlich gute Festigkeit. Es wäre auch möglich, mehrere Rohre gleichzeitig durch mehrere Laser, oder - weil das Lochbild im Rohrboden ein regelmäßiges Muster darstellt - durch Strahlteilung mit dem Rohrboden zu verschweißen.This form of the weld seam, which results from the special laser welding, gives the pipe-floor connection an extraordinarily good strength. It would also be possible to weld several tubes simultaneously using several lasers or - because the hole pattern in the tube sheet represents a regular pattern - by beam splitting with the tube sheet.

Claims (13)

Rohr-Bodenverbindung für einen Wärmetauscher mit einem von einem Wärmetauschmedium durchströmten Rohrblock mit parallel zueinander verlaufenden Rohren (1) aus Aluminium, die mindestens mit einem Ende in einem an einen Sammelraum angrenzenden Rohrboden (2) aus Aluminium gehalten und mit diesen dicht verbunden sind, insbesondere Kühler für Kraftfahrzeugmotoren, dadurch gekennzeichnet, daß die in den Rohrboden (2) eingeschobenen Rohrenden durch eine längs ihres gesamten Umfangs verlaufende Laserschweißnaht (3) mit dem Rohrboden verschweißt sind, deren Innenkontur (6) bündig in die Rohrinnenwandung (1a) und die in das Innere des Sammelraumes weisende Seite (2a) des Rohrbodens (2) übergeht.Pipe-bottom connection for a heat exchanger with a tube block through which a heat exchange medium flows and with aluminum tubes (1) running parallel to one another, which at least one end is held in an aluminum tube plate (2) adjacent to a collecting space and is tightly connected to the latter, in particular Radiator for motor vehicle engines, characterized in that the tube ends inserted into the tube sheet (2) are welded to the tube sheet by a laser weld seam (3) running along their entire circumference, the inner contour (6) of which is flush with the inner tube wall (1a) and the one into the The interior of the collecting space facing side (2a) of the tube sheet (2) merges. Rohr-Bodenverbindung nach Anspruch 1, dadurch gekennzeichnet, daß die Rohrachsen (4) jedes Rohres (1) senkrecht zum Rohrboden (2) stehen und die Schweißnaht (3) einen Querschnitt in Form eines Ovals aufweist, dessen Längsachse (5) etwa unter 45° zu der Rohrachse (4) verläuft.Pipe-floor connection according to claim 1, characterized in that the pipe axes (4) of each pipe (1) are perpendicular to the pipe base (2) and the weld seam (3) has a cross-section in the form of an oval, the longitudinal axis (5) of which is below 45 ° to the pipe axis (4). Rohr-Bodenverbindung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Stärke (b) des Rohrbodens (2) deutlich größer als die Dicke (s) der Rohrwandung ist.Pipe-bottom connection according to claims 1 and 2, characterized in that the thickness (b) of the tube sheet (2) is significantly greater than the thickness (s) of the tube wall. Rohr-Bodenverbindung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Schweißnaht (3) bis in einen Bereich des Rohres (1) reicht, der im Abstand zu der vom Sammelraum abgewandten Seite (2b) des Rohrbodens (2) liegt.Pipe-bottom connection according to one of claims 1 to 3, characterized in that the weld seam (3) extends into a region of the tube (1) which is at a distance from the side (2b) of the tube bottom (2) facing away from the collecting space. Rohr-Bodenverbindung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Schweißnaht (3) gemessen unter einem Winkel von 45° am Schnittpunkt zwischen der Rohraußenwandung und der Rohrbodenunterseite (2b) eine Dicke (a) aufweist, die größer ist als die Stärke (s) der Rohrwandung.Pipe-bottom connection according to one of Claims 1 to 4, characterized in that the weld seam (3), measured at an angle of 45 ° at the intersection between the outer tube wall and the underside of the tube sheet (2b), has a thickness (a) which is greater than that Thickness (s) of the pipe wall. Rohr-Bodenverbindung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Innenkontur (6) der Schweißnaht (3) abgerundet ist, so daß eine Art Einlauftrichter an der Rohrmündung entsteht.Pipe-floor connection according to one of claims 1 to 5, characterized in that the inner contour (6) of the weld seam (3) is rounded off, so that a kind of inlet funnel is formed at the pipe mouth. Rohr-Bodenverbindung nach Anspruch 1, dadurch gekennzeichnet, daß die Rohre (1) als Flachrohre ausgebildet sind.Pipe-floor connection according to claim 1, characterized in that the pipes (1) are designed as flat pipes. Rohr-Bodenverbindung nach Anspruch 7, dadurch gekennzeichnet, daß die Rohre (1) einen ovalen bzw. elliptischen Querschnitt besitzen.Pipe-floor connection according to claim 7, characterized in that the pipes (1) have an oval or elliptical cross-section. Rohr-Bodenverbindung nach Anspruch 1, dadurch gekennzeichnet, daß die Rohre (1) als Mehrkammerprofile mit flachem Querschnitt ausgebildet sind.Pipe-floor connection according to claim 1, characterized in that the pipes (1) are designed as multi-chamber profiles with a flat cross-section. Verfahren zur Herstellung einer Rohr-Bodenverbindung nach Anspruch 1 oder einem der anderen Ansprüche 2 bis 9, gekennzeichnet dadurch, daß die Öffnungen (7) im Rohrboden (2) so ausgelegt werden, daß die Rohrenden weitgehend spaltfrei in den Öffnungen gehalten sind, daß die Rohrenden in ihre zugeordneten Öffnungen (7) so eingeschoben werden, daß sie bündig zu der an den Sammelraum angrenzenden Seite (2a) des Rohrbodens (2) verlaufen, und daß dann die Laserschweißung durch einen entlang des Umfanges der Rohrenden geführten Laserstrahl erfolgt.A process for producing a tube-bottom connection according to claim 1 or one of the other claims 2 to 9, characterized in that the openings (7) in the tube plate (2) are designed so that the tube ends are held in the openings largely without gaps that the Tube ends are pushed into their associated openings (7) so that they run flush to the side (2a) of the tube sheet (2) adjoining the collecting space, and then the laser welding is carried out by a laser beam guided along the circumference of the tube ends. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß der Fügespalt (f) zwischen den Rohrenden und den zugeordneten Öffnungen (7) des Rohrbodens (2) ringsum kleiner als 0,1 mm ist.Method according to claim 10, characterized in that the joining gap (f) between the pipe ends and the associated openings (7) of the tube sheet (2) is smaller than 0.1 mm all around. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß die Schweißung unter Schutzgas erfolgt.A method according to claim 10, characterized in that the welding is carried out under a protective gas. Verfahren nach Anspruch 10, dadurch gekennzeichnet, daß die Schweißung mit einem gepulsten ND-YAG-Laser erfolgt.A method according to claim 10, characterized in that the welding is carried out with a pulsed ND-YAG laser.
EP94118838A 1993-12-22 1994-11-30 Heat exchanger Expired - Lifetime EP0660064B1 (en)

Applications Claiming Priority (2)

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DE4343825A DE4343825A1 (en) 1993-12-22 1993-12-22 Pipe-floor connection for a heat exchanger
DE4343825 1993-12-22

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EP0660064A2 true EP0660064A2 (en) 1995-06-28
EP0660064A3 EP0660064A3 (en) 1995-11-29
EP0660064B1 EP0660064B1 (en) 1998-05-27

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DE (2) DE4343825A1 (en)
ES (1) ES2116515T3 (en)

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Also Published As

Publication number Publication date
DE4343825A1 (en) 1995-06-29
ES2116515T3 (en) 1998-07-16
DE59406079D1 (en) 1998-07-02
EP0660064A3 (en) 1995-11-29
EP0660064B1 (en) 1998-05-27
US5749414A (en) 1998-05-12

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