EP0383173A1 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
EP0383173A1
EP0383173A1 EP90102376A EP90102376A EP0383173A1 EP 0383173 A1 EP0383173 A1 EP 0383173A1 EP 90102376 A EP90102376 A EP 90102376A EP 90102376 A EP90102376 A EP 90102376A EP 0383173 A1 EP0383173 A1 EP 0383173A1
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EP
European Patent Office
Prior art keywords
profile
profile tube
points
curve sections
arrangement according
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
EP90102376A
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German (de)
French (fr)
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EP0383173B1 (en
Inventor
Klaus 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
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MTU Motoren und Turbinen Union Muenchen GmbH
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Publication of EP0383173A1 publication Critical patent/EP0383173A1/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
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/355—Heat exchange having separate flow passage for two distinct fluids
    • Y10S165/40—Shell enclosed conduit assembly
    • Y10S165/401—Shell enclosed conduit assembly including tube support or shell-side flow director
    • Y10S165/416—Extending transverse of shell, e.g. fin, baffle
    • Y10S165/423—Bar

Definitions

  • the invention relates to a profile tube arrangement for a heat exchanger according to the preamble of patent claim 1.
  • Such a profile tube arrangement has become known from DE-PS 35 43 893, in which a number of S-shaped profile tubes are attached between a collecting tube and a matrix deflection section.
  • the curvature of the individual profile tubes gives rise to a number of advantages over straight profile tubes.
  • this solution has the disadvantage that the individual expansion compensation of a profile tube only results in a transverse deflection with respect to the surrounding collective of profile tubes at those points where the spacers of the maximum deflection points are arranged. This prevents the expansion compensation if it exceeds the play in the spacer.
  • the stringing together of curve sections according to the invention results in a complete wave train over the entire length of a profile tube, which enables a controlled buckling of an entire tube or an entire tube collective of a layer in the event of relative expansions due to thermal expansions or due to impact-related expansions or compressions in relation to their external restraint.
  • the profile tubes can thus be controlled in spite of fixations fixed on both sides and a firm connection at the points of the spacers and can only expand and contract in length with slight internal stresses under the effect of temperature differences and gradients without the flow cross sections between adjacent profile tubes being changed significantly. It must be emphasized that the profile tubes are made from one piece, and the individual curve sections only represent curved sections of a profile tube.
  • the significant advantage of the new shape of the profile tubes is that the spacers at their maximum Deflection points and the intermediate points can be fixed without play, whereby the collective of the profile tubes can be firmly supported against vibrations and impact forces at these points.
  • the expansion compensation is then carried out by compressing or stretching the profile tubes to the length of two abutting curve sections, ie between two fixing points, which occur at least twice along an entire tube section. For the same relative expansion there are transverse deflections which are about a factor 3 less than those of known designs.
  • the curve sections have constant radii of curvature, as a result of which the curve sections can be easily manufactured. It is advantageous if all curve sections have the same radius of curvature, which is approximately in the range of 1 to 2 times the length of the curve sections.
  • the distances between the profile tubes which are important for the flow can be kept sufficiently large in this way, even with large temperature differences.
  • the points of minimum distance between two profile tubes occur at the turning points, i.e. at the joints of two oppositely curved curve sections.
  • the curve sections have sinusoidal curves.
  • Two alternative embodiments of a sinusoidal curve are possible.
  • two curve sections together form a complete sine wave, the imaginary angular axis representing the straight-line connection of two fixing points.
  • the fixing points correspond to the angle 0 or 2 ⁇
  • the turning points at which two oppositely curved curve sections meet each other correspond to the angle ⁇ 2nd corresponds.
  • two curve sections together form a half cosine train. I.e. the imaginary angular axis is equally spaced parallel to the profile tube tangent at the two fixing points.
  • the two fixing points thus correspond to the angles 0 and ⁇ .
  • a further advantageous embodiment of the invention provides that the profile tubes have an approximately elliptical cross section, the individual curve sections being bent around the semi-axis with the lower bending resistance moment.
  • Such an elliptical cross-section enables an aerodynamically more favorable flow around the individual profile tubes.
  • a profile tube 1 is shown, which is attached by means of two collecting container fastening points 2a, 2b to two only partially drawn collecting containers 3a and 3b.
  • One of the two collecting containers (3a, 3b) can also be a deflecting section of a U-shaped profile tube matrix, for example.
  • Parallel to the profile tube 4 a plurality of similar, regularly spaced profile tubes 4 are provided which, together with the profile tube 1 shown, form a complete matrix through which a flow medium flows, for example from the collecting container 3a to the collecting container 3b is directed.
  • the fluid flow flowing inside the profile tubes 1, 4 is caused to heat exchange by a fluid flow flowing past in a cross flow, the flow direction of which is designated by 12.
  • the fluid flow moving within the profile tubes 1, 4 is usually heated up in the process.
  • the profiled tube 1 shown consists essentially of eight curve sections 5 of equal length, which adjoin one another at the turning points 6.
  • the curve sections 5 are only differently curved areas of the integrally produced profile tube 1, d. H. no large number of curve sections 5 are joined together, but rather a profile tube 1 is bent into the curve section accordingly.
  • the curve sections 5 are alternately curved (to the left or to the right) to form a serpentine contour which is superimposed on an essentially S-shaped course.
  • the profile tube 1 has two maximum deflection points 7a and 7b, between which an intermediate point 8 is provided which is equally distant from both points 7a, 7b.
  • two curve sections 5 are arranged in such a way that the centers of curvature lie on alternately opposite sides of the profiled tube 1, so that there is an alternating left and right curvature.
  • a total of four curve sections 5 lie between the maximum deflection points 7a and 7b.
  • the tangents 11 to the profile tube course in the maximum deflection points 7a, 7b and in the intermediate point 8 are parallel. Furthermore, spacers 9 are provided at the points 7a, 7b and 8, by means of which the distances to adjacent profile tubes 4 - which are not shown for reasons of clarity - are maintained (fixing points).
  • the tangents 11 at the collecting container attachment points 2a, 2b are also parallel to the above-mentioned tangents.
  • the curve sections 5 can have constant radii of curvature so that they can be regarded as circular sections, or they can have a sinusoidal shape.
  • the heat exchanger will be exposed to thermal expansions, with the collection containers 3a, 3b and the spacers 9 being able to be fixed in place at the same time.
  • the radius of curvature of the curve sections 5 or the amplitude of the sinusoidal curve section 5 must be dimensioned such that the minimum distances are still so large at maximum temperature-induced expansion that the the minimum permissible flow cross-sections between adjacent profile tubes 1.4 must not be undercut.
  • the radius of curvature should be selected in the range of 3-4 cm with a length of the curve sections of 2.5 cm.
  • the profile tubes are 1.4 wider than in the side view according to FIG. 1, which is due to the fact that the Profile tubes have approximately elliptical cross-section.
  • the inflow expediently takes place in the direction denoted by 12 and thus in the direction of the large semiaxis of the elliptical profile tubes 1, 4.
  • the spacers 9 are attached along regularly spaced locations, which keep both the profile tubes spaced apart in the direction of the large ellipse half-axis and the profile tubes spaced apart in the direction of the small semi-axis (FIG. 1) at a defined distance.

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

Abstract

A profiled tube assembly for a heat exchanger has profiled tubes which consist of a number of abutting curved sections (5), as a result of which it is possible to achieve an approximately snakily curved profiled tube contour. Consequently, thermal expansions can be compensated by balancing movements of the curved sections (5) without the overall position of the heat exchanger being altered or sizeable stresses arising. <IMAGE>

Description

Die Erfindung betrifft eine Profilrohranordnung für einen Wärme­tauscher gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a profile tube arrangement for a heat exchanger according to the preamble of patent claim 1.

Aus der DE-PS 35 43 893 ist eine derartige Profilrohranordnung bekannt geworden, bei der eine Anzahl S-förmig gekrümmter Profilröhrchen zwischen einem Sammelrohr und einem Matrixumlenkabschnitt angebracht sind. Durch die Krümmung der einzelnen Profilröhrchen ergeben sich eine Reihe von Vorteilen gegenüber gradlinig verlaufenden Pro­filröhrchen. Diese Lösung hat jedoch den Nachteil, daß der in­dividuelle Dehnungsausgleich eines Profilröhrchen einen Querausschlag in Bezug auf das es umgebende Kollektiv von Profilröhrchen nur an denjenigen Stellen zur Folge hat, an denen die Abstandshalter der maximalen Auslenkungspunkte angeordnet sind. Dadurch wird der Deh­nungsausgleich behindert, sofern er das in der Abstandshalterung vor­handene Spiel überschreitet.Such a profile tube arrangement has become known from DE-PS 35 43 893, in which a number of S-shaped profile tubes are attached between a collecting tube and a matrix deflection section. The curvature of the individual profile tubes gives rise to a number of advantages over straight profile tubes. However, this solution has the disadvantage that the individual expansion compensation of a profile tube only results in a transverse deflection with respect to the surrounding collective of profile tubes at those points where the spacers of the maximum deflection points are arranged. This prevents the expansion compensation if it exceeds the play in the spacer.

Hiervon ausgehend ist es Aufgabe der Erfindung, eine gattungsgemäße Anordnung derart zu verbessern, daß unter allen Betriebsbedingungen ein ungehinderter Dehnungsausgleich stattfinden kann, ohne daß sich die Wärmetauscheranordnung ungezielt verformt.Proceeding from this, it is an object of the invention to improve a generic arrangement in such a way that an unimpeded expansion compensation can take place under all operating conditions without the heat exchanger arrangement deforming in a targeted manner.

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

Die erfindungsgemäße Aneinanderreihung von Kurvenabschnitten ergibt über die gesamte Länge eines Profilröhrchens einen vollständigen Wel­lenzug, der ein kontrolliertes Ausknicken eines gesamten Röhrchens bzw. eines gesamten Röhrchenkollektivs einer Schicht bei Relativdeh­nungen durch Wärmedehnungen oder durch stoßbedingte Dehnungen bzw. Stauchungen im Verhältnis zu deren äußeren Einspannung ermöglicht. Die Profilröhrchen können sich somit trotz beidseitig fixierter Einspan­nungen und fester Verbindung an den Stellen der Abstandshalter kon­trolliert und nur mit geringen inneren Spannungen unter der Wirkung von Temperaturdifferenzen und -gradienten in der Länge ausdehnen und kontrahieren, ohne daß die Strömungsquerschnitte zwischen benachbarten Profilröhrchen wesentlich verändert werden. Es muß dabei betont wer­den, daß die Profilröhrchen aus einem Stück gefertigt sind, und die einzelnen Kurvenabschnitte lediglich gebogene Teilabschnitte eines Profilröhrchens darstellen.The stringing together of curve sections according to the invention results in a complete wave train over the entire length of a profile tube, which enables a controlled buckling of an entire tube or an entire tube collective of a layer in the event of relative expansions due to thermal expansions or due to impact-related expansions or compressions in relation to their external restraint. The profile tubes can thus be controlled in spite of fixations fixed on both sides and a firm connection at the points of the spacers and can only expand and contract in length with slight internal stresses under the effect of temperature differences and gradients without the flow cross sections between adjacent profile tubes being changed significantly. It must be emphasized that the profile tubes are made from one piece, and the individual curve sections only represent curved sections of a profile tube.

In Folge der S-förmigen Krümmung der Profilröhrchen erfolgt der Aus­gleich von Verbiegungen in der Ebene einer Profilröhrchenschicht durch Torsion der Kurvenabschnitte zwischen Abstandshaltern, wodurch ein geringerer Widerstand gegen Verbiegungen und somit geringere Spannun­gen gegenüber ungekrümmten Profilröhrchen erzielbar sind.As a result of the S-shaped curvature of the profiled tubes, bending in the plane of a profiled tube layer is compensated for by torsion of the curve sections between spacers, as a result of which less resistance to bending and thus lower stresses compared to non-curved profiled tubes can be achieved.

Der erhebliche Vorteil der neuen Formgestaltung der Profilröhrchen liegt darin, daß die Abstandshalter an den Stellen ihrer maximalen Auslenkungspunkte und den Zwischenpunkten spielfrei fixiert werden können, wodurch das Kollektiv der Profilröhrchen an diesen Stellen gegen Schwingungen und Stoßkräfte fest abgestützt werden kann. Der Dehnungsausgleich erfolgt dann durch Stauchen oder Strecken der Pro­filröhrchen auf jeweils der Länge zweier aneinander stoßender Kurven­abschnitte, d.h. zwischen je zwei Fixierpunkten, die entlang einer gesamten Rohrstrecke zumindest zweimal auftreten. Für die gleiche Relativdehnung ergeben sich dabei Querauslenkungen, die etwa um den Faktor 3 geringer sind als diejenigen von bekannten Ausführungen.The significant advantage of the new shape of the profile tubes is that the spacers at their maximum Deflection points and the intermediate points can be fixed without play, whereby the collective of the profile tubes can be firmly supported against vibrations and impact forces at these points. The expansion compensation is then carried out by compressing or stretching the profile tubes to the length of two abutting curve sections, ie between two fixing points, which occur at least twice along an entire tube section. For the same relative expansion there are transverse deflections which are about a factor 3 less than those of known designs.

In bevorzugter Weiterbildung der Erfindung weisen die Kurvenabschnitte konstante Krümmungsradien auf, wodurch eine einfache Herstellbarkeit der Kurvenabschnitte erreichbar ist. Dabei ist es von Vorteil, wenn alle Kurvenabschnitte den gleichen Krümmungsradius aufweisen, der etwa im Bereich von 1 bis 2fachen Länge der Kurvenabschnitte beträgt. Bei einem beispielsweise aus acht Kurvenabschnitten zusammengesetzten Profilröhrchen lassen sich auf diese Weise die für die Durchströmung wichtigen Abstände zwischen den Profilröhrchen auch bei großen Tempe­raturdifferenzen ausreichend groß halten. Die Stellen minimalen Ab­standes zwischen zwei Profilröhrchen treten an den Wendepunkten auf, d.h., an Stoßstellen zweier entgegengesetzt gekrümmter Kurvenab­schnitte.In a preferred development of the invention, the curve sections have constant radii of curvature, as a result of which the curve sections can be easily manufactured. It is advantageous if all curve sections have the same radius of curvature, which is approximately in the range of 1 to 2 times the length of the curve sections. In the case of a profile tube composed, for example, of eight curve sections, the distances between the profile tubes which are important for the flow can be kept sufficiently large in this way, even with large temperature differences. The points of minimum distance between two profile tubes occur at the turning points, i.e. at the joints of two oppositely curved curve sections.

In alternativer Ausbildung der Erfindung weisen die Kurvenabschnitte sinusförmigen Kurvenverlauf auf. Dabei sind zwei alternative Aus­führungsformen eines sinusförmigen Kurvenverlaufes möglich. Gemäß einer bevorzugten Alternative bilden zwei Kurvenabschnitte zusammen einen vollständigen Sinuszug, wobei die gedachte Winkelachse die grad­linige Verbindung zweier Fixierpunkte darstellt. Somit entsprechen die Fixierpunkte dem Winkel 0 bzw. 2π während die Wendestellen, an denen zwei entgegengesetzt gekrümmte Kurvenabschnitte auf einander treffen dem Winkel π 2

Figure imgb0001
entspricht.In an alternative embodiment of the invention, the curve sections have sinusoidal curves. Two alternative embodiments of a sinusoidal curve are possible. According to a preferred alternative, two curve sections together form a complete sine wave, the imaginary angular axis representing the straight-line connection of two fixing points. Thus, the fixing points correspond to the angle 0 or 2π, while the turning points at which two oppositely curved curve sections meet each other correspond to the angle π 2nd
Figure imgb0001
 corresponds.

Gemäß einer alternativen Ausführungsform bilden zwei Kuvenabschnitte zusammen einen halben Kosinuszug. D. h. die gedachte Winkelachse ist parallel gleich beabstandet zu den Profilröhrchentangenten an den beiden Fixierstellen. Die beiden Fixierstellen entsprechen somit den Winkeln 0 und π.According to an alternative embodiment, two curve sections together form a half cosine train. I.e. the imaginary angular axis is equally spaced parallel to the profile tube tangent at the two fixing points. The two fixing points thus correspond to the angles 0 and π.

Eine weitere vorteilhafte Ausbildung der Erfindung sieht vor, daß die Profilröhrchen etwa ellipsenartigen Querschnitt aufweisen, wobei die einzelnen Kurvenabschnitte um die Halbachse mit dem geringeren Biege­widerstandmoment gebogen sind. Ein derartig ellipsenartiger Quer­schnitt ermöglicht eine aerodynamisch günstigere Umströmung der ein­zelnen Profilröhrchen. Alternativ wäre es doch auch denkbar die Pro­filröhrchen mit Kreisquerschnitt zu fertigen, um eine vereinfachte Herstellung zu erzielen.A further advantageous embodiment of the invention provides that the profile tubes have an approximately elliptical cross section, the individual curve sections being bent around the semi-axis with the lower bending resistance moment. Such an elliptical cross-section enables an aerodynamically more favorable flow around the individual profile tubes. Alternatively, it would also be conceivable to manufacture the profile tubes with a circular cross section in order to achieve simplified production.

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

  • Fig. 1 eine schematische Seitenansicht eines Profilröhrchens,
  • Fig. 2 eine Draufsicht auf eine Profilröhrchenreihe.
The invention is explained below with reference to the accompanying drawings. It shows:
  • 1 is a schematic side view of a profile tube,
  • Fig. 2 is a plan view of a row of profile tubes.

In Fig. 1 ist ein Profilröhrchen 1 dargestellt, daß mittels zweier Sammelbehälterbefestigungspunkte 2a, 2b an zwei nur teilweise ge­zeichneten Sammelbehältern 3a und 3b angebracht ist. Dabei kann einer der beiden Sammelbehälter (3a, 3b) auch ein Umlenkabschnitt einer beispielsweise U-förmigen Profilrohrmatrix sein. Parallel zum Pro­filröhrchen 4 sind eine Vielzahl gleichartiger, regelmäßig beab­standeter Profilröhrchen 4 vorgesehen, die zusammen mit dem gezeigten Profilröhrchen 1 eine vollständige Matrix bilden, durch die ein Strö­mungsmedium beispielsweise vom Sammelbehälter 3a zum Sammelbehälter 3b geleitet wird. Dabei wird der innerhalb der Profilröhrchen 1,4 flie­ßende Fluidstrom von einem außen im Kreuzstrom vorbeifließenden Fluid­strom, dessen Strömungsrichtung mit 12 bezeichnet ist, zum Wärmetausch veranlaßt. Üblicherweise wird der innerhalb der Profilröhrchen 1,4 bewegende Fluidstrom dabei aufheizt.In Fig. 1, a profile tube 1 is shown, which is attached by means of two collecting container fastening points 2a, 2b to two only partially drawn collecting containers 3a and 3b. One of the two collecting containers (3a, 3b) can also be a deflecting section of a U-shaped profile tube matrix, for example. Parallel to the profile tube 4, a plurality of similar, regularly spaced profile tubes 4 are provided which, together with the profile tube 1 shown, form a complete matrix through which a flow medium flows, for example from the collecting container 3a to the collecting container 3b is directed. The fluid flow flowing inside the profile tubes 1, 4 is caused to heat exchange by a fluid flow flowing past in a cross flow, the flow direction of which is designated by 12. The fluid flow moving within the profile tubes 1, 4 is usually heated up in the process.

Das dargestellte Profilröhrchen 1 besteht im wesentlichen aus acht gleichlangen Kurvenabschnitten 5, die an den Wendestellen 6 aneinander anschließen. Dabei sind die Kurvenabschnitte 5 nur verschieden ge­krümmte Bereiche des integral hergestellten Profilröhrchens 1, d. h. es werden keine Vielzahl von Kurvenabschnitten 5 zusammengefügt, son­dern ein Profilröhrchen 1 wird entsprechend in die Kurvenabschnitt gebogen. Ferner sind die Kurvenabschnitte 5 abwechselnd entgegenge­setzt (nach links bzw. nach rechts) gekrümmt zur Bildung einer schlan­genlinienartigen Kontur, die einem im wesentlichen S-förmigen Verlauf überlagert ist.The profiled tube 1 shown consists essentially of eight curve sections 5 of equal length, which adjoin one another at the turning points 6. The curve sections 5 are only differently curved areas of the integrally produced profile tube 1, d. H. no large number of curve sections 5 are joined together, but rather a profile tube 1 is bent into the curve section accordingly. Furthermore, the curve sections 5 are alternately curved (to the left or to the right) to form a serpentine contour which is superimposed on an essentially S-shaped course.

Das Profilröhrchen 1 weist zwei Maximalauslenkungspunkte 7a und 7b auf, zwischen denen ein von beiden Punkten 7a, 7b gleichweit ent­fernter Zwischenpunkt 8 vorgesehen ist. Im Bereich zwischen den Maxi­malauslenkungspunkten 7a und 7b sind je zwei Kurvenabschnitte 5 so angeordnet, daß die Krümmungsmittelpunkte auf abwechselnd entgegenge­setzten Seiten des Profilröhrchens 1 liegen, so daß alternierend eine Links- und Rechtskrümmung vorhanden ist. Insgesamt liegen vier Kurven­abschnitte 5 zwischen den Maximalauslenkungspunkten 7a und 7b.The profile tube 1 has two maximum deflection points 7a and 7b, between which an intermediate point 8 is provided which is equally distant from both points 7a, 7b. In the area between the maximum deflection points 7a and 7b, two curve sections 5 are arranged in such a way that the centers of curvature lie on alternately opposite sides of the profiled tube 1, so that there is an alternating left and right curvature. A total of four curve sections 5 lie between the maximum deflection points 7a and 7b.

Die Tangenten 11 an den Profilröhrchensverlauf in den Maximalauslen­kungspunkten 7a, 7b und im Zwischenpunkt 8 sind parallel. Ferner sind an den Punten 7a, 7b und 8 Abstandshalter 9 vorgesehen, mittels deren die Abstände zu benachbarten Profilröhrchen 4 - die aus Übersichts­gründen nicht eingezeichnet sind - eingehalten werden (Fixierpunkte). Die Tangenten 11 an den Sammelbehälterbefestigungspunkten 2a, 2b sind ebenfalls parallel zu den obengenannten Tangenten.The tangents 11 to the profile tube course in the maximum deflection points 7a, 7b and in the intermediate point 8 are parallel. Furthermore, spacers 9 are provided at the points 7a, 7b and 8, by means of which the distances to adjacent profile tubes 4 - which are not shown for reasons of clarity - are maintained (fixing points). The tangents 11 at the collecting container attachment points 2a, 2b are also parallel to the above-mentioned tangents.

Die Kurvenabschnitte 5 können konstante Krümmungsradien aufweisen, so daß sie als Kreisabschnitte anzusehen sind, oder sie können sinusför­migen Verlauf haben.The curve sections 5 can have constant radii of curvature so that they can be regarded as circular sections, or they can have a sinusoidal shape.

Im Betrieb wird der Wärmetauscher thermischen Dehnungen ausgesetzt sein, wobei gleichzeitig die Sammelbehälter 3a, 3b und die Abstands­halter 9 ortsfest fixiert sein können..Dadurch ergibt sich der mit 10 bezeichnete, gestrichelt eingezeichnete Verlauf des Profilröhrchens 1, der also eine Thermodehnung des Profilröhrchens zuläßt ohne daß eine Gesamtformänderung des Wärmetauschers eintritt. Bei einer derartigen thermisch bedingten Verformung der Kurvenabschnitte 5 des Profil­röhrchens 1 tritt an denjenigen Wendestellen 6, die nicht gleich­zeitig Fixierpunkte 7a, 7b, 8 sind die größtmögliche Annäherung be­nachbarter Profilröhrchen auf, während aufgrund der Abstandshalter 9 an den letztgenannten Punkten keinerlei Veränderung des Abstandes zwischen einzelnen Profilröhrchen zu beobachten ist. Um unter allen Betriebsbedingungen eine für den Durchfluß notwendigen Mindestabstand benachbarter Profilröhrchen 1, 4 zu erhalten, ist der Krümmungradius der Kurvenabschnitte 5 bzw. die Amplitude des sinusförmigen Kurvenab­schnittes 5 derart zu bemessen, daß bei maximaler temperaturindu­zierter Dehnung die Minimalabstände noch so groß sind, daß die minimal zulässigen Strömungsquerschnitte zwischen benachbarten Profilröhrchen 1,4 nicht unterschritten werden. Beispielsweise bei einer Dicke der Profilröhrchen 1,4 von 1,6 mm und einer Temperaturdifferenz zwischen warmem und kaltem Zustand von 100 K ist der Krümmungsradius bei einer Länge der Kurvenabschnitte von 2,5 cm etwa im Bereich von 3 - 4 cm zu wählen.In operation, the heat exchanger will be exposed to thermal expansions, with the collection containers 3a, 3b and the spacers 9 being able to be fixed in place at the same time. This results in the profile tube 1, designated by dashed lines 10, which allows thermal expansion of the profile tube without that an overall change in shape of the heat exchanger occurs. With such a thermally induced deformation of the curve sections 5 of the profile tube 1 occurs at those turning points 6, which are not at the same time fixing points 7a, 7b, 8, the greatest possible approximation of adjacent profile tubes, while due to the spacers 9 at the latter points, no change in the distance between individuals Profile tube can be observed. In order to obtain a minimum distance between adjacent profile tubes 1, 4 that is necessary for the flow under all operating conditions, the radius of curvature of the curve sections 5 or the amplitude of the sinusoidal curve section 5 must be dimensioned such that the minimum distances are still so large at maximum temperature-induced expansion that the the minimum permissible flow cross-sections between adjacent profile tubes 1.4 must not be undercut. For example, with a thickness of the profile tubes 1.4 of 1.6 mm and a temperature difference between the warm and cold state of 100 K, the radius of curvature should be selected in the range of 3-4 cm with a length of the curve sections of 2.5 cm.

Bei der in Fig. 2 dargestellten Draufsicht auf eine Profilröhrchen­reihe ist zu sehen, daß die Profilröhrchen 1,4 breiter sind als in der Seitenansicht gemäß Fig. 1, was darauf zurückzuführen ist, daß die Profilröhrchen etwa ellipsenförmigen Querschnitt aufweisen. Zweck­mäßigerweise erfolgt die Anströmung in der mit 12 bezeichneten Rich­tung und somit in Richtung der großen Halbachse der ellipsenfömigen Profilröhrchen 1,4. Entlang regelmäßig beabstandeter Stellen sind die Abstandshalter 9 angebracht, die sowohl in Richtung der großen Ellip­senhalbachse beabstandeten Profilröhrchen als auch die in Richtung der kleinen Halbachse beabstandeten Profilröhrchen (Fig. 1) in einem definierten Abstand halten.In the plan view of a row of profile tubes shown in FIG. 2 it can be seen that the profile tubes are 1.4 wider than in the side view according to FIG. 1, which is due to the fact that the Profile tubes have approximately elliptical cross-section. The inflow expediently takes place in the direction denoted by 12 and thus in the direction of the large semiaxis of the elliptical profile tubes 1, 4. The spacers 9 are attached along regularly spaced locations, which keep both the profile tubes spaced apart in the direction of the large ellipse half-axis and the profile tubes spaced apart in the direction of the small semi-axis (FIG. 1) at a defined distance.

Claims (9)

1. Profilrohranordnung für einen Wärmetauscher, bei dem zwei Sammel­behälter über eine Vielzahl von gleichmäßig beabstandeten Pro­filröhrchen miteinander verbunden sind, wobei die Profilröhrchen S-förmig gekrümmt sind und an ihren Maximalauslenkungspunkten und an von diesen gleich weit entfernten Zwischenpunkten (Fixier­punkten) Abstandshalter aufweisen, mittels der die Abstände zu benachbarten Profilröhrchen festgelegt sind, dadurch gekennzeich­net, daß die Profilröhrchen (1,4) eine Anzahl aneinanderstoßender Kurvenabschnitte (5) aufweist, wobei zwischen benachbarten Fi­xierpunkten (7a, 7b, 8) zwei entgegengesetzt gekrümmte Kurvenab­schnitte (5) liegen und die Profilröhrchentangenten (11) in den Maximalauslenkungspunkten (7a, 7b) und den Zwischenpunkten (8) etwa parallel sind.1. Profile tube arrangement for a heat exchanger in which two collecting containers are connected to one another via a plurality of equally spaced profile tubes, the profile tubes being S-shaped and having spacers at their maximum deflection points and at intermediate points (fixing points) that are equally distant from them, by means of the the distances to adjacent profile tubes are defined, characterized in that the profile tube (1,4) has a number of abutting curve sections (5), two opposing curved curve sections (5) lying between adjacent fixing points (7a, 7b, 8) and the profile tube tangents (11) are approximately parallel in the maximum deflection points (7a, 7b) and the intermediate points (8). 2. Profilrohranordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Kurvenabschnitte (5) konstante Krümmungsradien aufweisen.2. Profile tube arrangement according to claim 1, characterized in that the curve sections (5) have constant radii of curvature. 3. Profilrohranordnung nach Anspruch 2, dadurch gekennzeichnet, daß jedes Profilröhrchen (1) 8 Kurvenabschnitte aufweist, derart, daß zwischen den Maximalauslenkungspunkten (7a, 7b) und den Sammmelbe­hälterbefestigungspunkten (2a, 2b) einerseits sowie dem Zwischen­punkt 8 andererseits je zwei Kurvenabschnitte (5) vorgesehen sind, und die Profilröhrchentangenten (11) in den Sammelbehälterbefesti­gungspunkten (2a, 2b) mit den Profilröhrchentangenten (11) in den Zwischenpunkten (8) fluchten.3. Profile tube arrangement according to claim 2, characterized in that each profile tube (1) has 8 curve sections, such that between the maximum deflection points (7a, 7b) and the collecting container attachment points (2a, 2b) on the one hand and the intermediate point 8 on the other hand, two curve sections (5 ) are provided, and the profile tube tangents (11) in the collecting container attachment points (2a, 2b) are aligned with the profile tube tangents (11) in the intermediate points (8). 4. Profilrohranordnung nach Anspruch 2 oder 3, dadurch gekenn­zeichnet, daß der Krümmungsradius das 1 - 2fache, vorzugsweise das 1,6fache der Länge der Kurvenabschnitte beträgt.4. Profile tube arrangement according to claim 2 or 3, characterized in that the radius of curvature is 1-2 times, preferably 1.6 times the length of the curve sections. 5. Profilrohranordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Kurvenabschnitte (5) sinusförmigen Kurvenverlauf aufweisen.5. Profile tube arrangement according to claim 1, characterized in that the curve sections (5) have sinusoidal curve shape. 6. Profilrohranordnung nach Anspruch 5 dadurch gekennzeichnet, daß zwei Kurvenabschnitte (5) zusammen einen vollständigen Sinuszug (0...π) ergeben.6. Profile tube arrangement according to claim 5, characterized in that two curve sections (5) together give a complete sine wave (0 ... π). 7. Profilrohranordnung nach Anspruch 5 dadurch gekennzeichnet, daß zwei Kurvenabschnitte (5) zusammen einen halben Cosinuszug (0...π) ergeben.7. Profile tube arrangement according to claim 5, characterized in that two curve sections (5) together give half a cosine train (0 ... π). 8. Profilrohranordnung nach einem der vorhergehenden Ansprüche da­durch gekennzeichnet, daß die Profilröhrchen (1) Kreis­querschnitt ausweisen.8. Profile tube arrangement according to one of the preceding claims, characterized in that the profile tubes (1) have a circular cross section. 9. Profilrohranordnung nach einem der Ansprüche 1 bis 7 dadurch ge­kennzeichnet daß die Profilröhrchen (1) etwa elliptischen Quer­schnitt aufweisen, wobei die Krümmung um die Halbachse mit dem geringeren Biegewiderstandsmoment erfolgt.9. Profile tube arrangement according to one of claims 1 to 7, characterized in that the profile tubes (1) have an approximately elliptical cross-section, the curvature around the semiaxis taking place with the lower bending moment.
EP90102376A 1989-02-11 1990-02-07 Heat exchanger Expired - Lifetime EP0383173B1 (en)

Applications Claiming Priority (2)

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DE3904140A DE3904140C1 (en) 1989-02-11 1989-02-11
DE3904140 1989-02-11

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JP (1) JPH02233991A (en)
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JPH0842982A (en) * 1994-05-17 1996-02-16 Hde Metallwerk Gmbh High efficiency type capillary type heat exchanger
US20040069470A1 (en) * 2002-09-10 2004-04-15 Jacob Gorbulsky Bent-tube heat exchanger
CN103307813B (en) * 2013-07-05 2016-08-17 丹佛斯微通道换热器（嘉兴）有限公司 Heat exchanger and manufacturing process thereof
EP4306786A3 (en) * 2022-07-15 2024-04-03 RTX Corporation Aircraft heat exchanger

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EP0228581A1 (en) * 1985-12-12 1987-07-15 Mtu Motoren- Und Turbinen-Union MàœNchen Gmbh Heat-exchanger

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ES2040520T3 (en) 1993-10-16
US5058663A (en) 1991-10-22
JPH02233991A (en) 1990-09-17
DE3904140C1 (en) 1990-04-05
EP0383173B1 (en) 1993-04-28

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