EP0396131A2 - Heat-exchanger - Google Patents

Heat-exchanger Download PDF

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Publication number
EP0396131A2
EP0396131A2 EP90108360A EP90108360A EP0396131A2 EP 0396131 A2 EP0396131 A2 EP 0396131A2 EP 90108360 A EP90108360 A EP 90108360A EP 90108360 A EP90108360 A EP 90108360A EP 0396131 A2 EP0396131 A2 EP 0396131A2
Authority
EP
European Patent Office
Prior art keywords
sheet metal
heat exchanger
metal shells
exchanger according
complementary
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
EP90108360A
Other languages
German (de)
French (fr)
Other versions
EP0396131A3 (en
EP0396131B1 (en
Inventor
Klaus Dipl.-Ing. Hagemeister
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.)
MTU Aero Engines GmbH
Original Assignee
MTU Motoren und Turbinen Union Muenchen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MTU Motoren und Turbinen Union Muenchen GmbH filed Critical MTU Motoren und Turbinen Union Muenchen GmbH
Publication of EP0396131A2 publication Critical patent/EP0396131A2/en
Publication of EP0396131A3 publication Critical patent/EP0396131A3/en
Application granted granted Critical
Publication of EP0396131B1 publication Critical patent/EP0396131B1/en
Anticipated expiration legal-status Critical
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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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0043—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0062—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements
    • F28D9/0075—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements the plates having openings therein for circulation of the heat-exchange medium from one conduit to another
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2225/00—Reinforcing means
    • F28F2225/04—Reinforcing means for conduits

Definitions

  • the invention relates to a heat exchanger with two parallel manifolds, which are connected to one another via a matrix of several layers of profile tubes, the manifolds and matrix being constructed from a multiplicity of sheet metal shells arranged one above the other.
  • a generic heat exchanger arrangement has become known from DE-PS 32 42 845, in which connecting pieces are formed by the sheet metal shells with the manifolds, inserted into the profile tubes and connected gas-tight therewith.
  • DE-PS 35 43 893 discloses an arrangement in which a layer of profile tubes of a U-shaped matrix is formed in that a number of straight profile tubes are inserted into a deflection section composed of two shells. Both arrangements have the disadvantage that a high manufacturing expenditure arises from the fact that individual profile tubes have to be manufactured and connected to the sheet metal shells. There is also the need to provide spacers along the extent of the profile tubes so that the in Do not touch the small tubes attached to each other during operation or vibrate too much. Spacers of this type, as are known, for example, from DE-OS 37 26 058, require a high outlay on assembly, as a result of which the manufacturing costs for a heat exchanger increase significantly given the large number of profile tubes used.
  • the main advantages of the training according to the invention are the fact that the production of a complete heat exchanger from the sub-elements, i. H. the individual sheet metal trays are very simple and can be manufactured precisely and with high repeatability. Furthermore, the manufacturing process can be automated in a simple manner and thus contributes to a further simplification of the manufacturing process. Further advantages of this arrangement are that the two complementary sheet metal shells of a profile tube layer can be connected to one another in a simple and automatable manner in a fluid-tight manner at the contact points provided, for. B. by welding (diffusion welding) or soldering. The spacers required to maintain the regular assignment of the profile tubes to one another can be molded on from the outset without additional manufacturing effort.
  • Every second profile tube layer is preferably offset in cross-section like a chessboard from the adjacent profile tube layers arranged in such a way that the profile tubes of the adjacent profile tube layers lie in the region of the longitudinal slots of a layer.
  • This arrangement which is known in principle, has the advantage that profiled tubes can be arranged in the greatest possible packing density and the flow around them and the degree of exchange can thus be optimized.
  • a further advantageous embodiment of the invention provides that elements which extend perpendicular to the sheet metal shell plane are attached to the connecting webs to form spacers relative to adjacent tube layers. These elements are preferably attached after the connection of two sheet metal shells forming a profile tube layer and in this way enables simple manufacture of spacers with respect to the adjacent profile tube layers.
  • these vertically extending elements are two side flaps of a connecting web, which are originally arranged parallel to the longitudinal axis of the profile tube and are folded back inwards to form the spacers. This process can be carried out in a simple automated manner for an entire layer or a whole series of spacers.
  • the vertically extending element can also consist of a rivet which is driven by the connecting webs of two complementary sheet metal shells lying one on top of the other.
  • the two rivet heads of this rivet are designed so that they are adapted to the shape of the adjacent tube layers at the point of contact.
  • the adjacent profile tube layers can also have special shape changes, for example depressions, at the points of contact with the rivet heads in order to achieve a better support effect.
  • a further advantageous embodiment of the invention provides that support ribs are attached between complementary sheet metal shells in the area of the longitudinal axis of the profile tube. This prevents deformation of the profile tubes during operation due to the pressure difference between the outer area and the interior of the profile tubes.
  • these support ribs are designed as strips running between the sheet metal shells and connected to them in a zigzag fashion.
  • the bar can either be pre-shaped in a zigzag manner or, as an originally straight bar, can be stretched into its end contour by bulging the profile tubes by means of increased internal pressure.
  • support ribs are designed as support strips extending in the longitudinal direction of the profile tubes, such that the interior of the profile tubes is divided into two parallel cavities. These support strips are connected along their entire extent to the sheet metal shells, which prevents them from expanding during operation due to the excess pressure inside. These support strips can consist of solid material, so that two completely separate cavities are provided within each profile tube, or they can be perforated to save weight.
  • an alternative embodiment for preventing the expansion of the profiled tubes is that the sheet metal shells have regularly spaced, knob-like indentations in the region of the center of the profile tube, on which the complementary sheet metal shells are connected to one another at points.
  • this training is very simple to carry out before or after the two complementary shells have been joined, and thus enables the tube support to be designed in a substantially simplified manner.
  • These indentations are preferably attached in such a way that they are in the region of the connection Dungsstege the adjacent profile tube layers are arranged so that attached to the connecting webs rivet heads can be fitted into the indentations.
  • the arched shape of the profile tube wall and the rib effect of the profile tip give the necessary stiffness and stability against deformation over the span of the distances between adjacent indentations, while the separating forces from the internal pressure are dissipated via the knob connection.
  • the magnitude of the forces at these points corresponds to the length of the respectively assigned pipe section and is therefore proportional to the distance between the indentations described above.
  • the indentations must be arranged in closer succession along the length of the pipe.
  • the sheet metal shells are preferably designed in a frame-like manner, the collecting tubes being formed by punched-outs with bent collars in the middle of two opposite longitudinal sides of the frame, and the longitudinal slots on both sides of the punched-out holes are aligned to form two opposite U-shaped dies.
  • This training enables a particularly effective construction of the heat exchanger, which has already proven itself in conventional production.
  • a further development of this embodiment provides that the longitudinal slots extend to the beginning of the transverse sides of the frame, the latter being designed as a cavity which communicates with all the profiled tubes in order to form common deflecting sections.
  • the cavities can, however, have such a height that the sheet metal shells lying one on top of the other lie directly on top of one another in this area and that the hot gas flowing around the outside of the matrix is optimally guided and lateral escape can be avoided by bypassing the heat exchanger. This advantageously improves the degree of exchange.
  • the cavities inside can be provided with support knobs or support ribs, which prevent expansion during operation.
  • Sheet metal plates of the required external dimensions, wall thickness and quality are provided with the required relief pattern under dies by a drawing / pressing process, the symmetrical interior flow spaces being formed as a half-shell.
  • a one-sided die can also be used for this purpose, the sheet metal being shaped using hydraulic or pneumatic pressure.
  • the heat exchanger should be designed in such a way that these shells are symmetrical even on the envelope, so that the required mirror symmetry of two half-shells, which together form a layer element of the flow interior, can be represented with only one relief pattern.
  • the half-shell-like sheet metal shells are then subjected to a surface treatment in order to activate contact surfaces for the subsequent integral connection.
  • the connection of the two sheet metal shells then takes place at the contact surfaces with the supply of energy, whereby laser welding, electron beam welding, soldering, pressure welding can be considered as a diffusion connection or analog processes.
  • the additional material required can either be applied beforehand to the surfaces to be joined (e.g. galvanically, by vapor deposition, plating, by spraying or printing) or can be interposed as a film.
  • welding or soldering through resistance heating and high-frequency electrical currents is also possible.
  • the complementary sheet metal shells are joined together by means of high-frequency welding, the sheet metal shells which are spread apart being pressed against one another along their contact surfaces by profiled rollers which are shaped and shaped along the sheet metal shells, the ends of which have not yet been joined Tin cups of high frequency electricity is introduced.
  • the two complementary sheet metal shells to be joined are precisely aligned with each other in one device and are inserted on one side into an inlet gap of profiled columns rotating against one another.
  • the profiling of the otherwise cylindrical surfaces of these rolls corresponds to the negative of the relief pattern of the sheet metal shells, so that the latter are pressed onto one another only at the points to be connected when they pass through the rolls.
  • the areas of the sheet metal shells which are not yet in engagement with the rollers are spread apart, so that a gap narrowing up to the point of engagement results between their surfaces which are to be joined and are to be joined.
  • a high-frequency electrical voltage of opposite polarity is supplied to both sheet metal shells via sliding contacts.
  • An electrical current forms on the inner surfaces of the two sheet metal shells, which runs to the point of contact and passes there to the other side. This current transfer may only take place at the points that are to be cohesively connected. Other points of contact can be passivated.
  • additional material in a raised manner to the points to be connected, or to have a mask made of additional material, which has the image of the connection points, run into the joint gap during the joining procedure.
  • An alternative embodiment of the method is that the joining of the sheet metal shells is carried out with laser beams instead of the high-frequency electrical current, the laser beams being focused between the two wedge-shaped plates on their common contact points.
  • a larger number of engagement points are distributed over the width of the rollers, at each of which the continuous profile sheets must be pressed exactly onto one another.
  • the respective roller is preferably broken up into individual disks. These discs have central holes through which a common guide shaft runs with a slight play. The discs can also be positioned in their outer circumference by guide rollers, three each are sufficient. In any case, the required contact pressure is applied to each individual disc via a roller that is diametrically opposite the point of engagement. This role is activated by hydraulic or pneumatic elements or by springs.
  • the individual profile tube layers are stacked on top of one another and likewise connected to one another in the region of the collecting tubes in the manner described above. It is also possible to produce the longitudinal slots and punched holes in the header pipes only after the two complementary sheet metal shells have been joined together, instead of initially carrying out the drawing / pressing process.
  • An alternative production method of the heat exchanger according to the invention consists in that a passivating layer is applied to flat, pretreated surfaces with the required external dimensions at the points that are not joined together. This happens e.g. B. also by printing.
  • the other areas to be connected are coated with additional material for soldering or diffusion welding, e.g. B. by screen printing.
  • the complementary sheets to be joined are then placed on top of one another and joined together by heating. To prevent warping or unacceptably large gaps, the sheets are pressed together.
  • the sheets are mechanically pressed only on their outline, while a hydraulic or pneumatic pressure is applied to the surface during the connection process.
  • the sheet metal shell 1 shown in FIG. 1 is constructed essentially in a frame-like manner and has two round cutouts 2a, b in the center of two opposite longitudinal sides of the frame to form two header tubes. Furthermore, a plurality of parallel longitudinal slots 4, which are regularly interrupted by connecting webs 3, are provided in such a way that continuous longitudinal strips 5 extending from the area of the recesses 2a, b to the transverse sides of the frame are formed to form walls of the profile tube.
  • the sheet metal shell 1 is profiled in the region of the longitudinal strips 5 in a trough-like manner to form profile tubes which are approximately elliptical in cross section.
  • FIG. 2 shows how a layer of profile tubes is formed by two sheet metal shells 1a, b lying one on top of the other.
  • the sheet metal shells 1a, b are correspondingly profiled in the area of the longitudinal strips 5.
  • the longitudinal slots 4 are interrupted by the connecting webs 3.
  • the profile tubes 6 are formed in that the longitudinal strips 5 along their edges 7 z. B. be joined together by welding.
  • Adjacent profile tube layers 8a, b are arranged offset such that the profile tubes 6 of one layer 8a are arranged in the region of the longitudinal slots 4 of the second profile tube layer 8b.
  • Rivets with two rivet heads 9a, b are let into the connecting webs 3 on both sides of the sheet metal shells 1a, b.
  • depressions 10 are provided in the profile tubes 6 of the profile tube layer 8b above and below them, in which the contacting wall sections are welded together. These depressions 10 are preferably provided in the area of the rivet heads 9a, b of the adjacent profile tube layer 8a. However, they can also be arranged in between if this is necessary due to the internal pressure.
  • FIG. 3 shows a cross section through three adjacent profile tube layers 8a, b, c, which shows how the rivet heads 9a, b of a profile tube layer 8b interact with the depressions 10 of the adjacent profile tube layers 8a, c.
  • the two sheet metal shells 1a, b are soldered or welded to one another at the depressions 10 in the region of the contact points 11.
  • 4 is the 3 shown in longitudinal section of the profile tube 6, wherein it can be seen that the depressions 10 are punctiform.
  • FIG. 5 An alternative embodiment of the connecting webs 3 is shown in FIG. 5, in which the spacing between two adjacent profile tube layers 8a, b takes place through bent-back side flaps 13 of the connecting webs 3.
  • FIG. 6 An alternative embodiment of the connecting webs 3 is shown in FIG. 5, in which the spacing between two adjacent profile tube layers 8a, b takes place through bent-back side flaps 13 of the connecting webs 3.
  • FIG. 6 An alternative embodiment of the connecting webs 3 is shown in FIG. 5, in which the spacing between two adjacent profile tube layers 8a, b takes place through bent-back side flaps 13 of the connecting webs 3.
  • VI-VI which is shown in Fig. 6
  • the profiled tube 6a has regularly spaced depressions 10 which are connected to one another along their contact points 11.
  • the version 6b has a longitudinally extending support bar 15b, which is alternately bent in one and in the other direction in order to achieve a sufficient connection surface with the profile tube walls 14a, b. Furthermore, the support bar 15b has regularly distributed recesses 16, which contributes to a reduction in weight.
  • the version 6c has a continuous, cross-sectionally concave support strip 15c, which is connected to the two profile tube walls 14a, b.
  • the profile tube 6d has a straight support bar 15d that is regularly perforated.
  • the embodiment for a profiled tube 6e shows a serpentine strip 18, which is also connected to the two profiled tube walls 14a, b.
  • the embodiment 6f finally shows a zigzag-like strip 18, which can be produced, for example, by stretching from an originally straight strip.
  • the two sheet metal shells 1a, b are bent up and are pressed against one another by two co-operating rollers 19a, b.
  • the sheet metal shells 1a, b are simultaneously drawn into the gap between the rollers 19a, b.
  • the sheet metal shells 1a, b are connected to an AC generator 21 via contacts 20a, b.
  • a high-frequency alternating voltage is passed over the sheet metal shells 1a, b to their connection point 22 in the gap between the rollers 19a, b.
  • the AC generator 21 supplies currents in the range of a few amperes at frequencies of approximately 10 MHz to 1 GHz.
  • the specialist chooses the exact parameters depending on the material, geometry and dimensions.
  • the heat exchanger elements produced in this way and consisting of two complementary sheet metal shells 1a, b are then stacked on top of one another and soldered to one another in another way, for example by means of diffusion welding or by applying solder material in the area around the cutouts 2a, b.

Abstract

Ein Wärmetauscher mit zwei parallelen Sammelrohren (2a, 2b), die über eine Matrix aus mehreren Lagen von Profilröhrchen miteinander verbunden sind, weist zur Bildung der einzelnen Lagen von Profilröhrchen (8a, b, c) eine Vielzahl von übereinander angeordneten Blechschalen (1a, 1b) auf, wobei zwei komplementäre, miteinander verbundene Blechschalen (1a, 1b) eine Vielzahl von parallelen Längsschlitzen (4) aufweist, die über Verbindungsstege (1) unterbrochen sind. Diese Anordnung ermöglicht eine wesentlich vereinfachte Herstellung eines Wärmetauschers.A heat exchanger with two parallel collecting tubes (2a, 2b), which are connected to one another via a matrix of several layers of profile tubes, has a plurality of sheet metal shells (1a, 1b) arranged one above the other in order to form the individual layers of profile tubes (8a, b, c) ), two complementary, interconnected sheet metal shells (1a, 1b) having a plurality of parallel longitudinal slots (4) which are interrupted by connecting webs (1). This arrangement enables a significantly simplified manufacture of a heat exchanger.

Description

Die Erfindung betrifft einen Wärmetauscher mit zwei parallelen Sammel­rohren, die über eine Matrix aus mehreren Lagen von Profilröhrchen miteinander verbunden sind, wobei Sammelrohre und Matrix aus einer Vielzahl von übereinander angeordneten Blechschalen aufgebaut sind.The invention relates to a heat exchanger with two parallel manifolds, which are connected to one another via a matrix of several layers of profile tubes, the manifolds and matrix being constructed from a multiplicity of sheet metal shells arranged one above the other.

Eine gattungsgemäße Wärmetauscheranordnung ist aus der DE-PS 32 42 845 bekannt geworden, bei der durch die Blechschalen mit den Sammelrohren kommunizierende Stutzen gebildet werden, in die Profilröhrchen ge­steckt und gasdicht damit verbunden werden.A generic heat exchanger arrangement has become known from DE-PS 32 42 845, in which connecting pieces are formed by the sheet metal shells with the manifolds, inserted into the profile tubes and connected gas-tight therewith.

Die DE-PS 35 43 893 offenbart eine Anordnung, bei der eine Lage von Profilröhrchen einer U-förmigen Matrix dadurch gebildet wird, daß eine Anzahl gradliniger Profilröhrchen in einen aus zwei Schalen zusammen­gesetzten Umlenkabschnitt eingesteckt sind. Beide Anordnungen haben den Nachteil, daß ein hoher Herstellungsaufwand dadurch entsteht, daß einzelne Profilröhrchen gefertigt und mit den Blechschalen verbunden werden müssen. Ferner besteht die Notwendigkeit, entlang der Erstrek­kung der Profilröhrchen Abstandhalter vorzusehen, damit sich die in geringem Abstand voneinander angebrachten Profilröhrchen nicht im Betrieb berühren oder zu sehr in Schwingungen geraten. Derartige Ab­standhalter, wie sie beispielsweise aus der DE-OS 37 26 058 bekannt geworden sind, erfordern einen hohen Montageaufwand, durch den sich bei der Vielzahl der verwendeten Profilröhrchen die Herstellungskosten für einen Wärmetauscher wesentlich erhöhen.DE-PS 35 43 893 discloses an arrangement in which a layer of profile tubes of a U-shaped matrix is formed in that a number of straight profile tubes are inserted into a deflection section composed of two shells. Both arrangements have the disadvantage that a high manufacturing expenditure arises from the fact that individual profile tubes have to be manufactured and connected to the sheet metal shells. There is also the need to provide spacers along the extent of the profile tubes so that the in Do not touch the small tubes attached to each other during operation or vibrate too much. Spacers of this type, as are known, for example, from DE-OS 37 26 058, require a high outlay on assembly, as a result of which the manufacturing costs for a heat exchanger increase significantly given the large number of profile tubes used.

Hiervon ausgehend ist es Aufgabe der vorliegenden Erfindung, den gat­tungsgemäßen Wärmetauscher derart zu verbessern, daß die Herstellung der Sammelrohre und Matrix gegenüber den vorbekannten Anordnungen wesentlich vereinfacht wird.Proceeding from this, it is an object of the present invention to improve the generic heat exchanger in such a way that the production of the header tubes and matrix is considerably simplified compared to the previously known arrangements.

Erfindungsgemäß wird diese Aufgabe durch die im Kennzeichnungsteil des Patentanspruchs 1 angegebenen Merkmale gelöst.According to the invention, this object is achieved by the features specified in the characterizing part of patent claim 1.

Die wesentlichen Vorteile der erfindungsgemäßen Ausbildung sind darin zu sehen, daß sich die Herstellung eines kompletten Wärmetauschers aus den Teilelementen, d. h. den einzelnen Blechschalen sehr einfach ge­staltet und dieser präzise und mit hoher Wiederholgenauigkeit herzu­stellen ist. Ferner ist das Fertigungsverfahren auf einfache Weise automatisierbar und trägt somit zu einer weiteren Vereinfachung des Herstellungsprozesses bei. Weitere Vorteile dieser Anordnung bestehen darin, daß die zwei komplementären Blechschalen einer Profilröhrchen­lage sich an den dafür vorgesehenen Kontaktstellen auf einfache und automatisierbare Weise aneinander fluiddicht verbinden lassen, z. B. durch Schweißen (Diffusionsschweißen) oder Löten. Die für die Aufrech­terhaltung der regulären Zuordnung der Profilröhrchen zueinander er­forderlichen Abstandshalter, können ohne zusätzlichen Fertigungsauf­wand von vornherein mit angeformt werden.The main advantages of the training according to the invention are the fact that the production of a complete heat exchanger from the sub-elements, i. H. the individual sheet metal trays are very simple and can be manufactured precisely and with high repeatability. Furthermore, the manufacturing process can be automated in a simple manner and thus contributes to a further simplification of the manufacturing process. Further advantages of this arrangement are that the two complementary sheet metal shells of a profile tube layer can be connected to one another in a simple and automatable manner in a fluid-tight manner at the contact points provided, for. B. by welding (diffusion welding) or soldering. The spacers required to maintain the regular assignment of the profile tubes to one another can be molded on from the outset without additional manufacturing effort.

Vorzugsweise ist jede zweite Profilröhrchenlage im Querschnitt schachbrettartig versetzt zu den benachbarten Profilröhrchenlagen angeordnet, derart, daß im Bereich der Längschlitze einer Lage die Profilröhrchen der benachbarten Profilröhrchenlagen liegen. Diese im Prinzip bekannte Anordnung hat den Vorteil, daß Profilröhrchen in einer größtmöglichen Packungsdichte angeordnet sein können und somit die Umströmung und der Austauschgrad optimierbar ist.Every second profile tube layer is preferably offset in cross-section like a chessboard from the adjacent profile tube layers arranged in such a way that the profile tubes of the adjacent profile tube layers lie in the region of the longitudinal slots of a layer. This arrangement, which is known in principle, has the advantage that profiled tubes can be arranged in the greatest possible packing density and the flow around them and the degree of exchange can thus be optimized.

Eine weitere vorteilhafte Ausbildung der Erfindung sieht vor, daß an den Verbindungsstegen zur Bildung von Abstandshalterungen gegenüber benachbarten Profilröhrchenlagen Elemente angebracht sind, die sich senkrecht zur Blechschalenebene hin erstrecken. Die Anbringung dieser Elemente erfolgt vorzugsweise nach dem Verbinden zweier eine Profil­röhrchenlage bildender Blechschalen und ermöglicht auf diese Weise eine einfache Herstellung von Abstandshaltern gegenüber den benach­barten Profilröhrchenlagen.A further advantageous embodiment of the invention provides that elements which extend perpendicular to the sheet metal shell plane are attached to the connecting webs to form spacers relative to adjacent tube layers. These elements are preferably attached after the connection of two sheet metal shells forming a profile tube layer and in this way enables simple manufacture of spacers with respect to the adjacent profile tube layers.

Diese sich senkrecht erstreckenden Elemente sind in einer bevorzugten Weiterbildung der Erfindung zwei Seitenlaschen eines Verbindungs­steges, die ursprünglich parallel zur Profilröhrchenlängsachse ange­ordnet sind und zur Bildung der Abstandshalter nach innen zurückge­faltet sind. Dieses Verfahren ist einfach automatisiert für eine ganze Lage oder eine ganze Reihe von Abstandshaltern durchführbar. Alterna­tiv zu dieser Ausführung kann das senkrecht verlaufende Element auch aus einem Niet bestehen, der durch die aufeinander liegenden Verbin­dungstege zweier komplementärer Blechschalen getrieben ist. Die beiden Nietköpfe dieses Nietes sind dabei so ausgebildet, daß sie an die Form der benachbarten Profilröhrchenlagen im Berührungspunkt angepaßt sind. Vorteilhafterweise können die benachbarten Profilröhrchenlagen auch an den Berührpunkten mit den Nietköpfen besondere Formveränderungen, beispielsweise Einsenkungen aufweisen, um eine bessere Stützwirkung zu erzielen.In a preferred development of the invention, these vertically extending elements are two side flaps of a connecting web, which are originally arranged parallel to the longitudinal axis of the profile tube and are folded back inwards to form the spacers. This process can be carried out in a simple automated manner for an entire layer or a whole series of spacers. As an alternative to this embodiment, the vertically extending element can also consist of a rivet which is driven by the connecting webs of two complementary sheet metal shells lying one on top of the other. The two rivet heads of this rivet are designed so that they are adapted to the shape of the adjacent tube layers at the point of contact. Advantageously, the adjacent profile tube layers can also have special shape changes, for example depressions, at the points of contact with the rivet heads in order to achieve a better support effect.

Eine weitere vorteilhafte Ausbildung der Erfindung sieht vor, daß zwischen komplementären Blechschalen im Bereich der Profilröhrchen-­Längsmittelachsen Stützrippen angebracht sind. Hierdurch wird eine Verformung der Profilröhrchen im Betrieb durch die Druckdifferenz zwischen dem Außenbereich und dem Inneren der Profilröhrchen verhin­dert. In vorteilhafter Weiterbildung der Erfindung sind diese Stütz­rippen als zickzackartig zwischen den Blechschalen verlaufende und mit diesen verbundene Leisten ausgebildet. Die Leiste kann entweder be­reits zickzackartig vorgeformt sein oder als ursprünglich grade Leiste durch Aufwölbung der Profilröhrchen mittels erhöhtem Innendruck in ihre Endkontur gestreckt sein.A further advantageous embodiment of the invention provides that support ribs are attached between complementary sheet metal shells in the area of the longitudinal axis of the profile tube. This prevents deformation of the profile tubes during operation due to the pressure difference between the outer area and the interior of the profile tubes. In an advantageous development of the invention, these support ribs are designed as strips running between the sheet metal shells and connected to them in a zigzag fashion. The bar can either be pre-shaped in a zigzag manner or, as an originally straight bar, can be stretched into its end contour by bulging the profile tubes by means of increased internal pressure.

Eine alternative Ausbildung der Stützrippen besteht darin, daß diese als in Längsrichtung der Profilröhrchen sich erstreckende Stützleisten ausgebildet sind, derart, daß der Innenraum der Profilröhrchen in zwei parallel verlaufende Hohlräume aufgeteilt ist. Diese Stützleisten sind dabei entlang ihrer gesamten Erstreckung mit den Blechschalen ver­bunden, wodurch verhindert wird, daß sich diese im Betrieb durch den innen herrschenden Überdruck aufweiten. Diese Stützleisten können dabei aus Vollmaterial bestehen, so daß zwei vollkommen getrennte Hohlräume innerhalb jedes Profilröhrchens vorgesehen sind, oder sie können zur Gewichtsersparnis perforiert sein.An alternative embodiment of the support ribs is that they are designed as support strips extending in the longitudinal direction of the profile tubes, such that the interior of the profile tubes is divided into two parallel cavities. These support strips are connected along their entire extent to the sheet metal shells, which prevents them from expanding during operation due to the excess pressure inside. These support strips can consist of solid material, so that two completely separate cavities are provided within each profile tube, or they can be perforated to save weight.

Eine alternative Ausbildung zur Verhinderung der Profilröhrchenauf­weitung besteht erfindungsgemäß darin, daß die Blechschalen im Bereich der Profilröhrchenmittelachsen regelmäßig beabstandete noppenartige Einstülpungen aufweisen, an denen die komplementären Blechschalen punktförmig miteinander verbunden sind. Diese Ausbildung ist herstel­lungstechnisch sehr einfach vor oder nach dem Zusammenfügen der beiden komplementären Schalen durchzuführen und ermöglicht somit eine wesent­lich vereinfachte Ausbildung der Röhrchenabstützung. Vorzugsweise sind diese Einstülpungen derart angebracht, daß sie im Bereich der Verbin­ dungsstege der benachbarten Profilröhrchenlagen angeordnet sind, so daß an den Verbindungsstegen angebrachte Nietköpfe in die Einstülpun­gen eingepaßt werden können. Über die Spannweite der Abstände benach­barter Einstülpungen geben die gewölbte Form der Profilröhrchenwandung sowie die Rippenwirkung der Profilspitze die notwendige Steifigkeit und Stabilität gegen Verformung, während die Trennkräfte aus dem In­nendruck über die Noppenverbindung abgetragen werden. Die Größe der Kräfte an diesen Stellen entspricht der Länge des jeweils zugeordneten Rohrabschnittes und ist damit dem oben beschriebenen Abstand der Ein­stülpungen proportional. Bei höheren Innendrücken müssen also die Einstülpungen in engerer Folge längs der Rohrlänge angeordnet sein.According to the invention, an alternative embodiment for preventing the expansion of the profiled tubes is that the sheet metal shells have regularly spaced, knob-like indentations in the region of the center of the profile tube, on which the complementary sheet metal shells are connected to one another at points. In terms of manufacturing technology, this training is very simple to carry out before or after the two complementary shells have been joined, and thus enables the tube support to be designed in a substantially simplified manner. These indentations are preferably attached in such a way that they are in the region of the connection Dungsstege the adjacent profile tube layers are arranged so that attached to the connecting webs rivet heads can be fitted into the indentations. The arched shape of the profile tube wall and the rib effect of the profile tip give the necessary stiffness and stability against deformation over the span of the distances between adjacent indentations, while the separating forces from the internal pressure are dissipated via the knob connection. The magnitude of the forces at these points corresponds to the length of the respectively assigned pipe section and is therefore proportional to the distance between the indentations described above. At higher internal pressures, the indentations must be arranged in closer succession along the length of the pipe.

Vorzugsweise sind die Blechschalen rahmenartig ausgebildet, wobei die Sammelrohre durch Ausstanzungen mit aufgebogenen Kragen in den Mitten zweier gegenüberliegender Rahmenlängsseiten gebildet sind, und die Längsschlitze beidseitig der Ausstanzungen zur Bildung zweier gegen­überliegender U-förmiger Matrizen ausgerichtet sind. Diese Ausbildung ermöglicht einen besonders effektiven Aufbau des Wärmetauschers, der sich in konventioneller Herstellung bereits bewährt hat. Eine Weiter­bildung dieser Ausführungsform sieht vor, daß die Längsschlitze sich bis zum Anfang der Rahmenquerseiten hin erstrecken, wobei die letzte­ren zur Bildung gemeinsamer Umlenkabschnitte als mit allen Pro­filröhrchen kommunizierender Hohlraum ausgebildet ist. Hierdurch ist es möglich, eine Lage von Profilröhrchen in einer daran angebrachten Haltevorrichtung abzustützen, so daß die Profilröhrchen bei Ein­wirkungen von Beschleunigungskräften durch Stöße und Erschütterungen weitgehend lastfrei bleiben. Die Hohlräume können aber eine solche Höhe aufweisen, daß die aufeinander liegenden Blechschalen in diesem Bereich direkt aufeinander liegen und daß das außen die Matrix um­strömende Heißgas optimal geführt wird und ein seitlicher Austritt unter Umgehung des Wärmetauschers vermieden werden kann. Hierdurch wird vorteilhafterweise der Austauschgrad verbessert. Zur Stützung können die Hohlräume im Inneren mit Stütznoppen oder Stützrippen versehen sein, die eine Aufweitung im Betrieb verhindern.The sheet metal shells are preferably designed in a frame-like manner, the collecting tubes being formed by punched-outs with bent collars in the middle of two opposite longitudinal sides of the frame, and the longitudinal slots on both sides of the punched-out holes are aligned to form two opposite U-shaped dies. This training enables a particularly effective construction of the heat exchanger, which has already proven itself in conventional production. A further development of this embodiment provides that the longitudinal slots extend to the beginning of the transverse sides of the frame, the latter being designed as a cavity which communicates with all the profiled tubes in order to form common deflecting sections. This makes it possible to support a position of profile tubes in a holding device attached thereto, so that the profile tubes remain largely load-free when subjected to acceleration forces due to impacts and vibrations. The cavities can, however, have such a height that the sheet metal shells lying one on top of the other lie directly on top of one another in this area and that the hot gas flowing around the outside of the matrix is optimally guided and lateral escape can be avoided by bypassing the heat exchanger. This advantageously improves the degree of exchange. For support the cavities inside can be provided with support knobs or support ribs, which prevent expansion during operation.

Zur Herstellung des erfindungsgemäßen Wärmetauschers werden erfin­dungsgemäß das folgende Verfahren vorgeschlagen:The following methods are proposed for producing the heat exchanger according to the invention:

Blechplatten der erforderlichen Außenmaße, Wandstärke und Qualität werden unter Gesenken durch einen Zieh-/Preßvorgang mit dem erfor­derlichen Reliefmuster versehen, wobei die Ausprägung der symme­trischen Innenströmungsräume als Halbschale entsteht. Dazu ist auch ein einseitiges Gesenk verwendbar, wobei die Ausformung des Bleches durch Anwendung von hydraulischem oder pneumatischem Druck erfolgt. Besonders vorteilhafterweise sollte der Wärmetauscher derart ge­staltet sein, daß diese Schalen auch auf Umschlag symmetrisch sind, dadurch ist die erforderliche Spiegelsymmetrie zweier Halbschalen, die zusammen ein Schichtelement des Strömungsinnenraumes bilden, mit nur einem Reliefmuster darstellbar.Sheet metal plates of the required external dimensions, wall thickness and quality are provided with the required relief pattern under dies by a drawing / pressing process, the symmetrical interior flow spaces being formed as a half-shell. A one-sided die can also be used for this purpose, the sheet metal being shaped using hydraulic or pneumatic pressure. Particularly advantageously, the heat exchanger should be designed in such a way that these shells are symmetrical even on the envelope, so that the required mirror symmetry of two half-shells, which together form a layer element of the flow interior, can be represented with only one relief pattern.

Die halbschalenartigen Blechschalen werden anschließend einer Ober­flächenbehandlung unterzogen, um Berührungsflächen für die folgende stoffschlüssige Verbindung zu aktivieren. Die Verbindung der beiden Blechschalen erfolgt sodann an den Berührungsflächen unter Energiezu­fuhr, wobei Laserschweißen, Elektronenstrahlschweißen, Löten, Preß­schweißen als Diffusionsverbindung oder analoge Verfahren in Frage kommen können. Bei letztgenannten beiden Verfahren kann das erfor­derliche Zusatzmaterial entweder bereits zuvor auf die zu verbindenden Oberflächen aufgebracht werden (z. B. galvanisch, durch Bedampfen, Plattieren, durch Spritzen oder Drucken) oder als Folie zwischengelegt werden. Alternativ ist auch Schweißen oder Löten durch Widerstander­wärmung sowie durch hochfrequente elektrische Ströme möglich.The half-shell-like sheet metal shells are then subjected to a surface treatment in order to activate contact surfaces for the subsequent integral connection. The connection of the two sheet metal shells then takes place at the contact surfaces with the supply of energy, whereby laser welding, electron beam welding, soldering, pressure welding can be considered as a diffusion connection or analog processes. In the latter two methods, the additional material required can either be applied beforehand to the surfaces to be joined (e.g. galvanically, by vapor deposition, plating, by spraying or printing) or can be interposed as a film. Alternatively, welding or soldering through resistance heating and high-frequency electrical currents is also possible.

Eine vorteilhafte Weiterbildung dieses Herstellungsverfahrens besteht darin, daß das Zusammenfügen der komplementären Blechschalen mittels Hochfrequenzschweißen erfolgt, wobei die auseinandergespreizten Blechschalen durch an die Profilröhrchen formangepaßte, profilierte, entlang der Blechschalen bewegte Walzen entlang ihrer Berührflächen gegeneinander gepreßt werden, wobei an den noch nicht gefügten Enden der Blechschalen hochfrequenter Strom eingeleitet wird. Hierzu sind die zwei zusammenzufügenden, komplementären Blechschalen in einer Vorrichtung genau zueinander ausgerichtet und werden auf einer Seite in einen Einlaufspalt von gegeneinander rotierenden, profilierenden Spalten eingeschoben. Die Profilierung der im übrigen zylindrischen Oberflächen dieser Walzen entspricht dem Negativ des Reliefmusters der Blechschalen, so daß letztere beim Durchlaufen der Walzen nur an den zu verbindenden Stellen aufeinander gepreßt werden. Die noch nicht im Eingriff der Walzen befindlichen Bereiche der Blechschalen werden auseinandergespreizt, so daß zwischen ihren einander zugewandten, zu verbindenden Oberflächen ein sich bis zur Eingriffsstelle verengender Spalt ergibt.An advantageous further development of this manufacturing process consists in that the complementary sheet metal shells are joined together by means of high-frequency welding, the sheet metal shells which are spread apart being pressed against one another along their contact surfaces by profiled rollers which are shaped and shaped along the sheet metal shells, the ends of which have not yet been joined Tin cups of high frequency electricity is introduced. For this purpose, the two complementary sheet metal shells to be joined are precisely aligned with each other in one device and are inserted on one side into an inlet gap of profiled columns rotating against one another. The profiling of the otherwise cylindrical surfaces of these rolls corresponds to the negative of the relief pattern of the sheet metal shells, so that the latter are pressed onto one another only at the points to be connected when they pass through the rolls. The areas of the sheet metal shells which are not yet in engagement with the rollers are spread apart, so that a gap narrowing up to the point of engagement results between their surfaces which are to be joined and are to be joined.

Über Schleifkontakte wird beiden Blechschalen eine hochfrequente elektrische Spannung gegensätzlicher Polarität zugeführt. Es bildet sich dabei auf den Innenoberflächen der beiden Blechschalen ein elek­trischer Strom aus, der bis zur Berührungsstelle läuft und dort auf die andere Seite übertritt. Dieser Stromübergang darf nur an den Stel­len stattfinden, die stoffschlüssig miteinander verbunden werden sol­len. Andere Berührungsstellen können passiviert werden. Zu diesem Zweck ist es auch möglich, zuvor auf den zu verbindenden Stellen Zu­satzmaterial erhaben aufzubringen oder bei der Fügeprozedur eine Maske aus Zusatzmaterial, die das Bild der Verbindungsstellen hat, mit in den Fügespalt einlaufen zu lassen.A high-frequency electrical voltage of opposite polarity is supplied to both sheet metal shells via sliding contacts. An electrical current forms on the inner surfaces of the two sheet metal shells, which runs to the point of contact and passes there to the other side. This current transfer may only take place at the points that are to be cohesively connected. Other points of contact can be passivated. For this purpose, it is also possible to apply additional material in a raised manner to the points to be connected, or to have a mask made of additional material, which has the image of the connection points, run into the joint gap during the joining procedure.

Wichtig ist es, durch diese Maßnahme und durch die Hochfrequenz des Stromes den Stromübergang auf die Fügestellen zu konzentrieren. Das bewirkt eine örtliche Erhöhung des Übergangswiderstandes mit starker Erwärmung und hohem elektrischem Spannungsgradienten in den benach­barten Spaltoberflächen kurz vor der Fügestelle. Hierdurch werden die beiden Blechschalen entlang ihrer vorzugsweise linienförmigen Be­rührstellen miteinander verschweißt. Aufgrund des hohen Spannungs­gradienten kann sich außerdem ein Lichtbogen ausbilden, wobei dessen Plasma Verunreinigungen von den zu fügenden Flächen entfernt und die Kontaktoberflächen der Verbindung aktiviert, die unmittelbar folgend durch Einlaufen in die gepreßte Zone zwischen den Walzen geschlossen wird. Dieser Vorgang läuft kontinuierlich beim Passieren der Walzen ab, so daß die beiden Platten danach an den dafür vorgesehenen Stellen miteinander verbunden sind.It is important to use this measure and the high frequency of the current to concentrate the current transfer on the joints. This causes a local increase in the contact resistance with strong heating and a high electrical voltage gradient in the neighboring gap surfaces just before the joint. As a result, the two sheet metal shells are welded to one another along their preferably linear contact points. Due to the high voltage gradient, an arc can also form, the plasma of which removes impurities from the surfaces to be joined and activates the contact surfaces of the connection, which is closed immediately after running into the pressed zone between the rollers. This process takes place continuously as it passes through the rollers, so that the two plates are then connected to one another at the designated locations.

Eine alternative Verfahrensausgestaltung besteht darin, daß anstelle des hochfrequenten elektrischen Stromes die Fügung der Blechschalen mit Laserstrahlen durchgeführt wird, wobei die Laserstrahlen zwischen den zwei keilförmig zusammenlaufenden Platten auf deren gemeinsame Kontaktstellen fokusiert werden.An alternative embodiment of the method is that the joining of the sheet metal shells is carried out with laser beams instead of the high-frequency electrical current, the laser beams being focused between the two wedge-shaped plates on their common contact points.

Über die Breite der Walzen verteilt sich eine größere Anzahl von Ein­griffsstellen, an deren jeder die durchlaufenden Profilbleche exakt aufeinander gepreßt werden müssen. Bei einer einstückigen Walze be­steht nun die Gefahr, daß durch örtlich unterschiedlichen Verschleiß sowie thermische und elastische Verformungen an einzelnen Stellen die Pressung mangelhaft wird, so daß dort keine einwandfreie Verbindung zustande kommt. Um dem abzuhelfen, ist vorzugsweise die jeweilige Walze in einzelne Scheiben aufgelöst. Diese Scheiben haben zentrische Bohrungen, durch die mit einem geringfügigen Spiel eine gemeinsame Führungswelle verläuft. Die Scheiben können aber auch in ihrem Außen­umfang durch Führungsrollen positioniert werden, wobei jeweils drei ausreichend sind. In jedem Fall wird über eine Rolle, die der Ein­griffsstelle diametral gegenüberliegt, jeder einzelnen Scheibe, die erforderliche Anpreßkraft aufgeprägt. Diese Rolle wird ihrerseits durch hydraulische oder pneumatische Elemente oder durch Federn unter Kraft gesetzt.A larger number of engagement points are distributed over the width of the rollers, at each of which the continuous profile sheets must be pressed exactly onto one another. In the case of a one-piece roller, there is now the risk that the pressure will be inadequate due to locally different wear and tear, as well as thermal and elastic deformations, so that there is no perfect connection. To remedy this, the respective roller is preferably broken up into individual disks. These discs have central holes through which a common guide shaft runs with a slight play. The discs can also be positioned in their outer circumference by guide rollers, three each are sufficient. In any case, the required contact pressure is applied to each individual disc via a roller that is diametrically opposite the point of engagement. This role is activated by hydraulic or pneumatic elements or by springs.

Nach dem Verbinden der zwei die Profilröhrchenwandungen einer Pro­filröhrchenlage bildenden Blechschalen werden die einzelnen Pro­filröhrchenlagen aufeinandergeschichtet und ebenfalls auf die oben beschriebene Art im Bereich der Sammelrohre miteinander verbunden. Es ist dabei auch möglich, die Längsschlitze und Ausstanzungen fuhr die Sammelrohre erst nach dem Zusammenfügen der zwei komplementären Blech­schalen zu fertigen, anstatt dies zu Anfang im Rahmen des Zieh-/Preß­vorganges durchzuführen.After connecting the two sheet metal shells forming the profile tube walls of a profile tube layer, the individual profile tube layers are stacked on top of one another and likewise connected to one another in the region of the collecting tubes in the manner described above. It is also possible to produce the longitudinal slots and punched holes in the header pipes only after the two complementary sheet metal shells have been joined together, instead of initially carrying out the drawing / pressing process.

Ein alternatives Herstellungsverfahren des erfindungsgemäßen Wärme­tauschers besteht darin, daß auf ebene, vorbehandelte Flächen mit den erforderlichen Außenmaßen an den Stellen, die nicht zusammengefügt werden, eine passivierende Schicht aufgebracht wird. Dies geschieht z. B. auch durch Aufdrucken. Die anderen, zu verbindenden Gebiete werden zum Löten oder Diffusionsschweißen mit Zusatzmaterial be­schichtet, z. B. durch Siebdruck. Anschließend werden die zu ver­bindenden komplementären Bleche aufeinandergelegt und durch Erhitzen zusammengefügt. Zur Verhinderung von Verzug oder unzulässig großen Spalten werden die Bleche dabei aufeinandergepreßt. Vorzugsweise wer­den dabei die Bleche nur an ihrem Umriß mechanisch festgepreßt, wäh­rend auf die Fläche während des Verbindungsvorganges ein hydraulischer oder pneumatischer Druck aufgebracht wird. Es kann dadurch geschehen, daß zunächst eine Glocke aufgesetzt wird, die am Rand die äußere Kon­tur der Bleche zusammenpreßt und sodann ein Gasdruck in dem ge­schlossenen Hohlraum aufgebracht wird. Die gefügten Platten werden anschließend zwischen Gesenke gelegt und durch pneumatischen oder hydraulischen Innendruck derart verformt, daß die inneren Strömungs­wege der Profilröhrchen aufgeblasen werden.An alternative production method of the heat exchanger according to the invention consists in that a passivating layer is applied to flat, pretreated surfaces with the required external dimensions at the points that are not joined together. This happens e.g. B. also by printing. The other areas to be connected are coated with additional material for soldering or diffusion welding, e.g. B. by screen printing. The complementary sheets to be joined are then placed on top of one another and joined together by heating. To prevent warping or unacceptably large gaps, the sheets are pressed together. Preferably, the sheets are mechanically pressed only on their outline, while a hydraulic or pneumatic pressure is applied to the surface during the connection process. It can be done by first placing a bell, which compresses the outer contour of the sheets at the edge, and then applying a gas pressure in the closed cavity. The joined panels will be then placed between dies and deformed by pneumatic or hydraulic internal pressure such that the inner flow paths of the profile tubes are inflated.

Die Erfindung wird nachfolgend anhand der beigefügten Zeichnungen weiter erläutert. Dabei zeigt:

  • Fig. 1: eine Draufsicht auf eine Blechschale,
  • Fig. 2: eine Schrägansicht von mehreren Profilröhrchen,
  • Fig. 3: einen Querschnitt durch Profilröhrchen im Bereich der Noppen­verbindung,
  • Fig. 4: einen Längsschnitt durch Profilröhrchen,
  • Fig. 5: einen Querschnitt durch eine andere Profilröhrchenausführung,
  • Fig. 6: einen Längsschnitt gemäß der Linie VI-VI von Fig. 5,
  • Fig. 7: mehrere Profilröhrchenquerschnitte,
  • Fig. 8: eine Vorrichtung zur Durchführung des Fügeverfahrens.
The invention is further explained below with reference to the accompanying drawings. It shows:
  • 1: a plan view of a sheet metal shell,
  • 2: an oblique view of several profile tubes,
  • 3 shows a cross section through profile tubes in the area of the knob connection,
  • 4: a longitudinal section through profile tubes,
  • 5 shows a cross section through another profile tube design,
  • 6: a longitudinal section along the line VI-VI of FIG. 5,
  • 7: several profile tube cross sections,
  • 8: a device for carrying out the joining process.

Die in Fig. 1 dargestellte Blechschale 1 ist im wesentlichen rahmen­artig aufgebaut und weist in den Mitten zweier gegenüberliegender Rahmenlängsseiten zwei runde Aussparungen 2a,b zur Bildung von zwei Sammelrohren auf. Ferner ist eine Vielzahl von parallel ausgerich­teten, regelmäßig über Verbindungsstege 3 unterbrochenen Längsschlit­zen 4 vorgesehen, derart, daß vom Bereich der Aussparungen 2a,b bis zu den Rahmenquerseiten hin sich erstreckende, durchgehende Längsstrei­fen 5 zur Bildung von Profilröhrchenwandungen ausgebildet sind. Die Blechschale 1 ist dabei im Bereich der Längsstreifen 5 muldenartig profiliert zur Bildung von im Querschnitt etwa ellipsenartiger Pro­filröhrchen.The sheet metal shell 1 shown in FIG. 1 is constructed essentially in a frame-like manner and has two round cutouts 2a, b in the center of two opposite longitudinal sides of the frame to form two header tubes. Furthermore, a plurality of parallel longitudinal slots 4, which are regularly interrupted by connecting webs 3, are provided in such a way that continuous longitudinal strips 5 extending from the area of the recesses 2a, b to the transverse sides of the frame are formed to form walls of the profile tube. The The sheet metal shell 1 is profiled in the region of the longitudinal strips 5 in a trough-like manner to form profile tubes which are approximately elliptical in cross section.

In der Schrägansicht gemäß Fig. 2 ist zu erkennen, wie durch zwei aufeinanderliegende Blechschalen 1a,b eine Lage von Profilröhrchen gebildet wird. Dabei sind die Blechschalen 1a,b im Bereich der Längsstreifen 5 entsprechend profiliert. Ferner zu erkennen ist, daß die Längsschlitze 4 durch die Verbindungsstege 3 unterbrochen sind. Die Profilröhrchen 6 werden dadurch gebildet, daß die Längsstreifen 5 entlang ihrer Ränder 7 z. B. mittels Schweißen zusammengefügt werden. Benachbart übereinanderliegende Profilröhrchenlagen 8a,b sind dabei derart versetzt angeordnet, daß die Profilröhrchen 6 der einen Lage 8a im Bereich der Längsschlitze 4 der zweiten Profilröhrchenlage 8b angeordnet sind.2 shows how a layer of profile tubes is formed by two sheet metal shells 1a, b lying one on top of the other. The sheet metal shells 1a, b are correspondingly profiled in the area of the longitudinal strips 5. It can also be seen that the longitudinal slots 4 are interrupted by the connecting webs 3. The profile tubes 6 are formed in that the longitudinal strips 5 along their edges 7 z. B. be joined together by welding. Adjacent profile tube layers 8a, b are arranged offset such that the profile tubes 6 of one layer 8a are arranged in the region of the longitudinal slots 4 of the second profile tube layer 8b.

In den Verbindungsstegen 3 sind Niete mit zwei Nietköpfen 9a,b auf beiden Seiten der Blechschalen 1a,b eingelassen. Gleichzeitig sind in den Profilröhrchen 6 der darüber und darunter liegenden Profilröhr­chenlage 8b Einsenkungen 10 vorgesehen, bei denen die sich berührenden Wandabschnitte zusammengeschweißt sind. Diese Einsenkungen 10 sind vorzugsweise im Bereich der Nietköpfe 9a,b der benachbarten Profil­röhrchenlage 8a vorgesehen. Sie können aber auch zusätzlich dazwi­schen angeordnet sein, wenn dies aufgrund des Innendruckes erforder­lich ist.Rivets with two rivet heads 9a, b are let into the connecting webs 3 on both sides of the sheet metal shells 1a, b. At the same time, depressions 10 are provided in the profile tubes 6 of the profile tube layer 8b above and below them, in which the contacting wall sections are welded together. These depressions 10 are preferably provided in the area of the rivet heads 9a, b of the adjacent profile tube layer 8a. However, they can also be arranged in between if this is necessary due to the internal pressure.

In Fig. 3 ist ein Querschnitt durch drei benachbarte Profilröhr­chenlagen 8a,b,c dargestellt, an denen gezeigt ist, wie die Nietköpfe 9a,b einer Profilröhrchenlage 8b mit den Einsenkungen 10 der benach­barten Profilröhrchenlagen 8a,c zusammenwirken. Die beiden Blech­schalen 1a,b sind dabei im Bereich der Berührstellen 11 an den Ein­senkungen 10 miteinander verlötet oder verschweißt. In Fig. 4 ist die Anordnung gemäß Fig. 3 im Längsschnitt der Profilröhrchen 6 darge­stellt, wobei zu erkennen ist, daß die Einsenkungen 10 punktförmig ausgebildet sind.FIG. 3 shows a cross section through three adjacent profile tube layers 8a, b, c, which shows how the rivet heads 9a, b of a profile tube layer 8b interact with the depressions 10 of the adjacent profile tube layers 8a, c. The two sheet metal shells 1a, b are soldered or welded to one another at the depressions 10 in the region of the contact points 11. 4 is the 3 shown in longitudinal section of the profile tube 6, wherein it can be seen that the depressions 10 are punctiform.

Eine alternative Ausgestaltung der Verbindungsstege 3 ist in Fig. 5 dargestellt, bei der der Abstand zweier benachbarter Profilröhrchen­lagen 8a,b durch zurückgebogene Seitenlaschen 13 der Verbindungsstege 3 erfolgt. In dem Schnitt gemäß der Linie VI-VI, der in Fig. 6 darge­stellt ist, ist zu erkennen wie die Seitenlaschen 13 der Verbindungs­stege 3 zur Bildung der Abstandshalter zwischen den Profilröhrchen­lagen 8a,c ausgebildet sind.An alternative embodiment of the connecting webs 3 is shown in FIG. 5, in which the spacing between two adjacent profile tube layers 8a, b takes place through bent-back side flaps 13 of the connecting webs 3. In the section along the line VI-VI, which is shown in Fig. 6, it can be seen how the side flaps 13 of the connecting webs 3 are formed to form the spacers between the tube layers 8a, c.

In Fig. 7 sind verschiedene Formen von Profilröhrchen im Querschnitt sowie im Längsschnitt dargestellt, wobei verschiedene Möglichkeiten zur Abstützung der Profilröhrchenwandungen 14a,b zur Verhinderung der Ausbauchung durch Innendruck dargestellt sind. Das Profilröhrchen 6a weist regelmäßig beabstandet angeordnete Einsenkungen 10 auf, die entlang ihrer Berührstellen 11 miteinander verbunden sind. Die Aus­führung 6b weist eine in Längsrichtung verlaufende Stützleiste 15 b auf, die abwechselnd in die eine und in die andere Richtung ausge­knickt ist, um eine ausreichende Verbindungsfläche mit den Profil­röhrchenwandungen 14a,b zu erreichen. Ferner weist die Stützleiste 15b regelmäßig verteilte Aussparungen 16 auf, was zu einer Gewichtsredu­zierung beiträgt. Die Ausführung 6c weist eine durchgehende, im Quer­schnitt konkavartige Stützleiste 15c auf, die mit beiden Profilröhr­chenwandungen 14a,b verbunden ist. Das Profilröhrchen 6d weist eine gerade Stützleiste 15d auf, die regelmäßig perforiert ist. Diese kann auch entlang der Linie 17 geteilt ausgeführt sein, wobei die beiden Teilleisten entlang dieser Linie 17 miteinander verbunden sind. Die Ausführungsform für ein Profilröhrchen 6e zeigt eine schlangenartig gewundene Leiste 18, die ebenfalls mit den beiden Profilröhrchen­wandungen 14a,b verbunden ist. Die Ausführungsform 6f schließlich zeigt eine zickzackartig verlaufende Leiste 18, die beispielsweise durch Strecken aus einer ursprünglich geradlinigen Leiste hergestellt werden kann.7 shows different shapes of profile tubes in cross-section and in longitudinal section, various possibilities for supporting the profile tube walls 14a, b to prevent bulging due to internal pressure being shown. The profiled tube 6a has regularly spaced depressions 10 which are connected to one another along their contact points 11. The version 6b has a longitudinally extending support bar 15b, which is alternately bent in one and in the other direction in order to achieve a sufficient connection surface with the profile tube walls 14a, b. Furthermore, the support bar 15b has regularly distributed recesses 16, which contributes to a reduction in weight. The version 6c has a continuous, cross-sectionally concave support strip 15c, which is connected to the two profile tube walls 14a, b. The profile tube 6d has a straight support bar 15d that is regularly perforated. This can also be divided along line 17, the two partial strips being connected to one another along this line 17. The embodiment for a profiled tube 6e shows a serpentine strip 18, which is also connected to the two profiled tube walls 14a, b. The embodiment 6f finally shows a zigzag-like strip 18, which can be produced, for example, by stretching from an originally straight strip.

In Fig. 8 ist eine Vorrichtung zur Durchführung des Fügeverfahrens zweier komplementärer Blechschalen 1a,b dargestellt.8 shows a device for carrying out the joining process of two complementary sheet metal shells 1a, b.

Die beiden Blechschalen 1a,b sind aufgebogen, und werden durch zwei zusammenwirkende Walzen 19a,b gegeneinander gedrückt. Durch die Rota­tion der Walzen 19a,b werden die Blechschalen 1a,b dabei gleichzeitig in den Spalt zwischen den Walzen 19a,b gezogen. An ihren walzenfernen Ende sind die die Blechschalen 1a,b über Kontakte 20a,b mit einem Wechselstromgenerator 21 verbunden. Mittels dieses Wechselstromgen­erators 21 wird eine hochfrequente Wechselspannung über die Blech­schalen 1a,b bis an deren Verbindungsstelle 22 im Spalt zwischen den Walzen 19a,b geleitet. Aufgrund der Hochfrequenz bewegt sich der Strom praktisch ausschließlich an der Bauteiloberfläche und erhitzt an der Verbindungsstelle die beiden Blechschalen 1a,b, diese werden durch die Erwärmung und die über die Walzen 19a,b aufgebrachte Druckspannung zusammengefügt werden. Der Wechselstromgenerator 21 liefert dabei Stromstärken im Bereich von einigen Ampere bei Frequenzen von etwa 10 MHz - 1 GHz. Die genauen Parameter wählt der Fachmann abhängig von Werkstoff, Geometrie und Abmessungen.The two sheet metal shells 1a, b are bent up and are pressed against one another by two co-operating rollers 19a, b. As a result of the rotation of the rollers 19a, b, the sheet metal shells 1a, b are simultaneously drawn into the gap between the rollers 19a, b. At their end remote from the roller, the sheet metal shells 1a, b are connected to an AC generator 21 via contacts 20a, b. By means of this alternating current generator 21, a high-frequency alternating voltage is passed over the sheet metal shells 1a, b to their connection point 22 in the gap between the rollers 19a, b. Due to the high frequency, the current moves practically exclusively on the component surface and heats the two sheet metal shells 1a, b at the connection point, these are joined together by the heating and the compressive stress applied via the rollers 19a, b. The AC generator 21 supplies currents in the range of a few amperes at frequencies of approximately 10 MHz to 1 GHz. The specialist chooses the exact parameters depending on the material, geometry and dimensions.

Die auf dieser Weise hergestellten, aus zweikomplementären Blech­schalen 1a,b bestehenden Wärmetauscherelemente werden anschließend übereinandergestapelt und auf andere Weise, beispielsweise mittels Diffusionsschweißen oder durch Aufbringen von Lötmaterial im Bereich um die Aussparungen 2a,b miteinander verlötet.The heat exchanger elements produced in this way and consisting of two complementary sheet metal shells 1a, b are then stacked on top of one another and soldered to one another in another way, for example by means of diffusion welding or by applying solder material in the area around the cutouts 2a, b.

Claims (18)

1. Wärmetauscher mit zwei parallelen Sammelrohren, die über eine Matrix aus mehreren Lagen von Profilröhrchen miteinander verbunden sind, wobei Sammelrohre und Matrix aus einer Vielzahl von überein­ander angeordneten Blechschalen aufgebaut sind, dadurch gekenn­zeichnet, daß je zwei komplementäre, miteinander verbundene Blech­schalen (1a,b) unter Bildung von Längsschlitzen (4) eine Profil­röhrchenlage (8a,bc) und den zugehörigen Abschnitt der Sammelrohre ausformen, wobei zwischen den parallelen Längsschlitzen (4) Ver­bindungsstege (3) vorgesehen sind und die Blechschalen (1a, 1b) zwischen je zwei Längsschlitzen (4) muldenartig profiliert sind.1. Heat exchanger with two parallel manifolds, which are connected to one another via a matrix of several layers of profile tubes, the manifolds and matrix being constructed from a plurality of sheet metal shells arranged one above the other, characterized in that two complementary, interconnected sheet metal shells (1a, b ) forming a profile tube layer (8a, bc) and the associated section of the header tubes, forming longitudinal slots (4), connecting webs (3) being provided between the parallel longitudinal slots (4) and the sheet metal shells (1a, 1b) between two longitudinal slots ( 4) are trough-shaped. 2. Wärmetauscher nach Anspruch 1, dadurch gekennzeichnet, daß jede zweite Profilröhrchenlage (8a,c) im Querschnitt schachbrettartig versetzt zu den benachbarten Profilröhrchenlagen (8b) angeordnet ist, derart, daß im Bereich der Längsschlitze (4) einer Lage (8b) die Profilröhrchen (6) der benachbarten Profilröhrchenlagen (8a,c) liegen.2. Heat exchanger according to claim 1, characterized in that every second profile tube layer (8a, c) is arranged in cross-section in a checkerboard manner to the adjacent profile tube layers (8b), such that in the region of the longitudinal slots (4) of a layer (8b) the profile tubes (6) of the adjacent profile tube layers (8a, c). 3. Wärmetauscher nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Blechschalen (1a,b) zwischen je zwei Längsschlitzen (4) zur Bildung von im Querschnitt lanzettenartigen oder ellipsenartigen Profilröhrchen (6) ausgeformt sind.3. Heat exchanger according to claim 1 or 2, characterized in that the sheet metal shells (1a, b) are formed between two longitudinal slots (4) to form lancet-like or elliptical profile tubes (6) in cross section. 4. Wärmetauscher nach Anspruch 1, dadurch gekennzeichnet, daß die Verbindungsstege (3) regelmäßig beabstandet sind, und an ihnen zur Bildung von Abstandshaltern gegenüber benachbarten Profilröhrchen­lagen (8a,c) Elemente (9a,c) angebracht sind, die sich senkrecht zur Blechschalenebene hin erstrecken.4. Heat exchanger according to claim 1, characterized in that the connecting webs (3) are regularly spaced, and elements (9a, c) are attached to them to form spacers opposite adjacent tube layers (8a, c), which are perpendicular to the sheet metal shell plane extend. 5. Wärmetauscher nach Anspruch 4, dadurch gekennzeichnet, daß jeder Verbindungssteg (3) einer Blechschale (1a,b) zwei zurückgefaltete Seitenlaschen (13) aufweist.5. Heat exchanger according to claim 4, characterized in that each connecting web (3) of a sheet metal shell (1a, b) has two folded-back side flaps (13). 6. Wärmetauscher nach Anspruch 4, dadurch gekennzeichnet, daß durch zwei aufeinanderliegende Verbindungsstege (3) zweier komple­mentärer Blechschalen (1a,b) ein Niet mit zwei Nietköpfen (9a,c) gezogen ist.6. Heat exchanger according to claim 4, characterized in that a rivet with two rivet heads (9a, c) is drawn by two superimposed connecting webs (3) of two complementary sheet metal shells (1a, b). 7. Wärmetauscher nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zwischen komplementären Blechschalen (1a,b) im Bereich der Profilröhrchenlängsmittelachsen Stützmittel (15,18) angebracht sind.7. Heat exchanger according to one of the preceding claims, characterized in that support means (15, 18) are attached between complementary sheet metal shells (1a, b) in the region of the longitudinal axis of the profile tube. 8. Wärmetauscher nach Anspruch 7, dadurch gekennzeichnet, daß die Stützmittel als zickzackartig zwischen den Blechschalen (1a,b) und mit diesen verbundene Leisten (18) ausgebildet sind.8. Heat exchanger according to claim 7, characterized in that the support means are designed as a zigzag between the sheet metal shells (1a, b) and with these strips (18). 9. Wärmetauscher nach Anspruch 7, dadurch gekennzeichnet, daß die Stützmittel als zwischen an den Blechschalen (1a,b) in Pro­filröhrchenlängsrichtung sich erstreckende Stützleisten (15b,c) ausgebildet sind.9. Heat exchanger according to claim 7, characterized in that the support means are designed as support strips (15b, c) extending between the sheet metal shells (1a, b) in the longitudinal direction of the profile tube. 10. Wärmetauscher nach einem der Ansprüche 1 bis 6, dadurch ge­kennzeichnet, daß die Blechschalen regelmäßig beabstandete noppen­artige Einstülpungen (10) aufweisen, an denen die komplementären Blechschalen (1a,b) punktförmig miteinander verbunden sind.10. Heat exchanger according to one of claims 1 to 6, characterized in that the sheet metal shells have regularly spaced knob-like indentations (10) on which the complementary sheet metal shells (1a, b) are connected to one another in a punctiform manner. 11. Wärmetauscher nach Anspruch 6 und 10, dadurch gekennzeichnet, daß die Nietköpfe (9a,c) in den Einstülpungen (10) benachbarter Pro­filröhrchenlagen (8a,c) abgestützt sind.11. Heat exchanger according to claim 6 and 10, characterized in that the rivet heads (9a, c) in the indentations (10) of adjacent tube layers (8a, c) are supported. 12. Wärmetauscher nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Blechschalen (1a,b) rahmenartig ausge­bildet sind, wobei Sammelrohre durch Aussparungen (2a,b) mit auf­gebogenem Kragen in den Mitten zweier gegenüberliegender Rahmen­längsseiten gebildet sind und die Längsschlitze (4) beidseitig der Aussparungen (2a,b) zur Bildung zweier gegenüberliegender U-förmi­ger Matritzen ausgerichtet sind.12. Heat exchanger according to one of the preceding claims, characterized in that the sheet metal shells (1a, b) are frame-like, wherein manifolds are formed by recesses (2a, b) with a bent collar in the middle of two opposite longitudinal sides of the frame and the longitudinal slots (4) are aligned on both sides of the cutouts (2a, b) to form two opposite U-shaped matrices. 13. Wärmetauscher nach Anspruch 12, dadurch gekennzeichnet, daß die Längsschlitze (4) sich bis zum Anfang der Rahmenquerseiten hin erstrecken, wobei die letzteren zur Bildung gemeinsamer Um­lenkabschnitte als mit allen Profilröhrchen (6) kommunizierender Hohlraum ausgebildet sind.13. Heat exchanger according to claim 12, characterized in that the longitudinal slots (4) extend to the beginning of the frame transverse sides, the latter being designed to form common deflecting sections as a cavity communicating with all profiled tubes (6). 14. Wärmetauscher nach Anspruch 13, dadurch gekennzeichnet, daß in­nerhalb der Umlenkabschnitte Stütznoppen oder Stützrippen ange­bracht sind.14. Heat exchanger according to claim 13, characterized in that support knobs or support ribs are attached within the deflection sections. 15. Verfahren zur Herstellung eines Wärmetauschers nach einem oder mehreren der Ansprüche 1 bis 14, gekennzeichnet durch folgende Verfahrensschritte: a) Blechplatten der erforderlichen Außenmaße durch einen Zieh­preßvorgang mit dem erforderlichen Reliefmuster versehen, wobei die Längsschlitze (4) und Aussparungen (2a,b) ausgestanzt wer­den, b) Behandeln der Oberflächen der zu fügenden Berührflächen zweier komplementärer Blechschalen (1a,b) zur Aktivierung für die folgende stoffschlüssige Verbindung, c) Fügen der Berührflächen zweier komplementärer Blechschalen, (1a,b) mittels Schweißen oder Löten, d) Anbringen von Abstandshaltern an den Verbindungsstegen (3), e) Zusammenfügen benachbarter Profilröhrchenlagen (8a,b,c) entlang von Aufwölbungen der Aussparungen (2a,b) zur Bildung von Sam­melrohren. 15. A process for producing a heat exchanger according to one or more of claims 1 to 14, characterized by the following process steps: a) sheet metal plates of the required external dimensions are provided with the required relief pattern by a drawing-pressing process, the longitudinal slots (4) and cutouts (2a, b) being punched out, b) treating the surfaces of the contact surfaces to be joined of two complementary sheet metal shells (1a, b) for activation for the following integral connection, c) joining the contact surfaces of two complementary sheet metal shells, (1a, b) by means of welding or soldering, d) attaching spacers to the connecting webs (3), e) joining together adjacent tube layers (8a, b, c) along bulges of the recesses (2a, b) to form manifolds. 16. Verfahren zur Herstellung eines Wärmetauschers nach einem oder mehreren der Ansprüche 1 bis 14, gekennzeichnet durch folgende Verfahrensschritte: a) Blechplatten der erforderlichen Außenmaße durch einen Zieh­preßvorgang mit dem erforderlichen Reliefmuster versehen, b) Behandeln der Oberflächen der zu fügenden Berührflächen zweier komplementärer Blechschalen (1a,b) zur Aktivierung für die folgende stoffschlüssige Verbindung, c) Fügen der Berührflächen zweier komplementärer Blechschalen, (1a,b) mittels Schweißen oder Löten, d) Längsschlitze (4) und Aussparungen (2a,b) ausstanzen, e) Anbringen von Abstandshaltern an den Verbindungsstegen (3), f) Zusammenfügen benachbarter Profilröhrchenlagen (8a,b,c) entlang von Aufwölbungen der Aussparungen (2a,b) zur Bildung von Sam­melrohren. 16. A process for producing a heat exchanger according to one or more of claims 1 to 14, characterized by the following process steps: a) provide sheet metal plates of the required external dimensions with the required relief pattern by means of a drawing press process, b) treating the surfaces of the contact surfaces to be joined of two complementary sheet metal shells (1a, b) for activation for the following integral connection, c) joining the contact surfaces of two complementary sheet metal shells, (1a, b) by means of welding or soldering, d) punch out longitudinal slots (4) and recesses (2a, b), e) attaching spacers to the connecting webs (3), f) joining adjacent profile tube layers (8a, b, c) along bulges of the cutouts (2a, b) to form manifolds. 17. Verfahren nach Anspruch 15 oder 16, dadurch gekennzeichnet, daß das Zusammenfügen der komplementären Blechschalen (1a,b) mittels Hochfrequenzschweißen erfolgt, wobei die auseinandergespreizten Blechschalen (1a,b) durch an die Profilröhrchenform angepaßte, profilierte, Walzen (19a,b) entlang ihrer Berührflächen gegenein­ander gepreßt werden, wobei an den noch nicht gefügten Enden der Blechschalen (1a,b) hochfrequenter Strom eingeleitet wird.17. The method according to claim 15 or 16, characterized in that the joining of the complementary sheet metal shells (1a, b) is carried out by means of high-frequency welding, the spread-apart sheet metal shells (1a, b) by profiled rollers (19a, b) adapted to the shape of the tube shape. are pressed against one another along their contact surfaces, high-frequency current being introduced at the ends of the sheet metal shells (1a, b) which have not yet been joined. 18. Verfahren zur Herstellung eines Wärmetauschers nach einem oder mehreren der Ansprüche 1 bis 14, gekennzeichnet durch folgende Verfahrensschritte: a) zwei entsprechend ausgestanzte komplementäre Blechplatten wer­den an den nicht zu fügenden einander zugewandten Innenflächen mit einer passivierenden Schicht versehen, während die zu fü­genden Flächen mit Zusatzmaterial beschichtet werden, b) die aufeinandergelegten Blechplatten werden durch Erhitzen zusammengefügt, c) die gefügten Platten werden zwischen Gesenke gelegt und durch Innendruck zur Bildung der Strömungshohlräume aufgeblasen, d) Zusammenfügen benachbarter Profilröhrchenlagen entlang der Ränder der Ausstanzungen (2a,b) zur Bildung der Sammelrohre. 18. A method for producing a heat exchanger according to one or more of claims 1 to 14, characterized by the following method steps: a) two corresponding punched-out complementary sheet metal plates are provided with a passivating layer on the mutually facing inner surfaces which are not to be joined, while the surfaces to be joined are coated with additional material, b) the stacked sheet metal plates are assembled by heating, c) the joined plates are placed between dies and inflated by internal pressure to form the flow cavities, d) Joining adjacent profile tube layers along the edges of the punched-out portions (2a, b) to form the collecting tubes.
EP90108360A 1989-05-05 1990-05-03 Heat-exchanger Expired - Lifetime EP0396131B1 (en)

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DE3914774A DE3914774A1 (en) 1989-05-05 1989-05-05 HEAT EXCHANGER

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US4270602A (en) * 1978-08-30 1981-06-02 The Garrett Corporation Heat exchanger
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Also Published As

Publication number Publication date
EP0396131A3 (en) 1991-07-10
DE59002877D1 (en) 1993-11-04
DE3914774A1 (en) 1990-11-08
DE3914774C2 (en) 1992-12-03
JPH0351695A (en) 1991-03-06
US5086837A (en) 1992-02-11
EP0396131B1 (en) 1993-09-29

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