EP0239814A2 - Profiled tube having an elliptical or lancet-shaped cross-section, for use in tubular heat exchangers, and method for its manufacture - Google Patents
Profiled tube having an elliptical or lancet-shaped cross-section, for use in tubular heat exchangers, and method for its manufacture Download PDFInfo
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- EP0239814A2 EP0239814A2 EP87102993A EP87102993A EP0239814A2 EP 0239814 A2 EP0239814 A2 EP 0239814A2 EP 87102993 A EP87102993 A EP 87102993A EP 87102993 A EP87102993 A EP 87102993A EP 0239814 A2 EP0239814 A2 EP 0239814A2
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- Prior art keywords
- semi
- leg
- finished products
- profile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/151—Making tubes with multiple passages
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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
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
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- 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
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4935—Heat exchanger or boiler making
- Y10T29/49366—Sheet joined to sheet
Definitions
- the invention relates to a profile tube with an elliptical or lancet-shaped cross section for tube heat exchangers, made from thin-walled sheet metal.
- a tube of this type is known, which is divided into two chambers by a transverse web running centrally in the direction of the small ellipse axis (two-chamber profile).
- a crosspiece serves both to stiffen the tube in order to prevent bulging of the slightly curved tube walls and to increase the degree of heat exchange. It has now been shown that the efficiency of a tube heat exchanger can be increased by using profile tubes with a particularly slim lancet cross section in the matrix.
- the object of the present invention is therefore to create a profile tube of the generic type which is capable of high with a slim contour Withstanding internal pressure, allowing a high degree of heat exchange and thereby causing as little flow loss as possible inside.
- the object is achieved by a generic profile tube which has at least two transverse webs penetrating the interior at a distance from one another in the direction of the small ellipse axis.
- the subdivision of the profile tube into at least three chambers according to the invention brings about a considerable improvement in the flow and heat exchange conditions compared to a two-chamber profile.
- the multi-chamber construction means that the same thin sheet thickness can be used as for small profile tubes in a two-chamber construction without the stiffness against bulging being inadmissibly reduced.
- the invention relates to a process for the production with profile tubes with an elliptical or lancet-shaped cross section for tube heat exchangers with at least two transverse webs penetrating the interior in the direction of the small axis of the ellipse at a distance from one another by bending endless metal strip and subsequently joining the free edges.
- a method is disclosed for a two-chamber profile by the above-mentioned DE-OS 33 27 660.
- the object is achieved in that first two congruent profile semi-finished products are bent, which has approximately the shape of an isosceles triangle with a rounded tip and with a leg extended beyond the base, and these semi-finished products are then placed together so that the free The ends of the extended legs rest against the base edge of the other semi-finished product.
- the requirements can be fully met, and it also ensures a low outlay in terms of device technology, since the construction from two congruent semi-finished products means that only a single, relatively simple profile has to be bent.
- a further development of this method according to the invention is that n intermediate parts with a right-angled Z-contour and frcicn legs are interposed between the two semi-finished products to produce profile tubes with 2 + n crosspieces.
- multi-chamber lancet profiles can be constructed with a maximum of two differently curved semi-finished products, which means that the manufacturing outlay can be kept low.
- the semi-finished products are bent by initially shaping the initially flat metal strip into a right-angled Z contour with two free legs and then the longer of the free legs at about half the length of the leg, it is bent by more than 90 ° so that its end edge lies against the base edge formed by the Z-web and the other free leg.
- This type of bending of the semifinished product is particularly advantageous with regard to subsequent joining, since the edges to be joined lie in the area of flat or slightly convex surfaces and are therefore particularly easily accessible.
- a semifinished product can be shaped in such a way that the initially flat metal strip is first bent to a right-angled profile with a shorter leg and a longer leg that has the length of the crosspiece, and then the longer one Leg is bent by a point that is less than half the length of the leg from the apex of the right angle by more than 90 ° until it rests against the free end of the shorter leg.
- This type of bending of the semi-finished product has the advantage that the flat sheet metal strip is only subjected to bending in one direction.
- the distance of the bending point from the right-angle apex should be about 1/3 of the leg length of the longer leg, which has the consequence that the length of the three chambers of the finished profile tube is approximately the same in each case.
- the method according to the invention can be carried out in such a way that the triangular hollow profiles of the two semi-finished products are first closed by joining and then the semi-finished products are joined to one another or with the interposition of intermediate parts, it is advantageous if the joining of each semi-finished product and the joining the semi-finished products with each other or with the intermediate part in the same operation. This facilitates the production of continuous profile tubes.
- Fig. 1 three profile tubes r of a tube heat exchanger matrix are shown in their staggered arrangement, one of them in cross section, the other two only in outline.
- the elliptical profile tube shown in cross section has two transverse webs q which penetrate the interior at a distance from one another in the direction of the small ellipse axis k. This creates two approximately triangular cavities on both ends of an approximately rectangular cavity.
- the so-called three-chamber profile shown already has the shape of a very slim ellipse, the wall parts of which are correspondingly slightly curved. Accordingly, with a multi-chamber profile, which has 2 + n crossbars, an even slimmer tube contour can be represented.
- the illustration according to FIG. 2 illustrates a first production method according to the invention for a profile tube according to FIG. 1.
- the two congruent profile semifinished products 2, 3 are formed by bending endless metal strips, each of which approximately has the shape of an isosceles triangle with a rounded tip and with has a leg 23 or 33 which is elongated beyond the base 20, 30.
- These semi-finished products 2, 3 are put together so that the free ends 22, 32 of the elongated legs 23, 33 each abut the base edge 25, 35 of the other semi-finished product.
- the joints at the edges 25, 26, 35, 36, which are still shown as an open column in FIG. 2, are closed by welding or soldering.
- the semi-finished products 2, 3 shown in FIG. 2 are bent, as is apparent from FIG. 4, in such a way that the initially flat metal strip is first formed into a right-angle Z contour with the free legs 21, 23 and then the longer of the free legs at about half the length of the legs is bent so far that its end edge 24 abuts the base edge 26.
- the right-angle Z contour is shown in full lines, the bend of the longer leg 21 is indicated by dashed lines.
- a second type of manufacture of an elliptical profile tube according to FIG. 1 results.
- two semi-finished products 2, 3 having a congruent profile are again bent and assembled in such a way that the overall profile of the tube follows Fig. 1 arises.
- a semi-finished product is shaped in such a way that the initially flat metal strip initially has a right-angled profile with a shorter leg 20 and a longer leg 21 that has the length of the transverse web q of the profiled tube is bent.
- the longer leg 21 is then bent by a point less than half the leg length from the right-angle apex 25 until it abuts the free end of the shorter leg 20.
- the migration of the end edge of the longer leg 21 is indicated in Fig. 5 with a dashed line and arrow.
- the point at which the longer leg 21 is bent is preferably approximately 1/3 of the total leg length.
- the middle rectangular chamber in the finished profile tube is approximately the same length as the two outer triangular chambers.
- FIG. 6 shows the production of an elliptical tube with four chambers.
- the total Contour of this profile tube is formed from two above-described congruent semi-finished products 2, 3 and an intermediate part 1, which has a right-angled Z contour with free legs 11, 13.
- the Z-web of the intermediate part 1 is designated 10.
- the remaining reference numerals are chosen as in FIG. 2.
- the finished profile tube is created, as stated above, by welding or soldering the joint gap.
- Profile tubes with an even greater length in the direction of the large ellipse axis g can be produced in that several intermediate parts 1 are inserted in an analogous manner between the two semi-finished products 2, 3.
- the embodiment shown in FIG. 7 of the semi-finished products assembled to form the tube contour differs from the embodiment according to FIG. 6 only in that the free legs of the semi-finished products 2, 3 and the intermediate part 1 to be joined have end edges 27 bent outwards. Such a contour proves to be particularly advantageous for performing the welded connections.
- the figures each contain greatly enlarged representations of the profile tubes to be produced.
- the extent of the elliptical cross-sectional contour is approximately 10 mm in the direction of the large ellipse axis, approximately 3 mm in the direction of the small ellipse axis and the wall thickness of the sheets used is in the range between 0.2 and 0.4 mm.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Profilröhrchen mit elliptischem Querschnitt in Mehrkammerbauweise für Röhrchenwärmetauscher. Verfahren zur Herstellung von elliptischen Mehrkammerprofilröhrchen aus Blechstreifen durch Biegen von zwei kongruentes Profil aufweisenden Halbzeugen und nachfolgendes Fügen.Profile tubes with elliptical cross-section in multi-chamber design for tube heat exchangers. Process for the production of elliptical multi-chamber profile tubes from sheet metal strips by bending two semifinished products having a congruent profile and subsequent joining.
Description
Die Erfindung bezieht sich auf ein Profilröhrchen mit elliptischem oder lanzettförmigem Querschnitt für Röhrchenwärmetauscher, hergestellt aus dünnwandigem Blech.The invention relates to a profile tube with an elliptical or lancet-shaped cross section for tube heat exchangers, made from thin-walled sheet metal.
Aus der DE-OS 33 27 660 ist ein Röhrchen dieser Gattung bekannt, welches durch einen mittig in Richtung der kleinen Ellipsenachse verlaufenden Quersteg in zwei Kammern aufgeteilt ist (Zweikammerprofil). Bei aus dünnwandigem Blech hergestellten Profilröhrchen dient ein solcher Quersteg sowohl zur Versteifung des Röhrchens, um eine Ausbeulung der schwach gewölbten Röhrchenwände zu verhindern als auch einer Erhöhung des Wärmeaustauschgrades. Es hat sich nun gezeigt, daß der Wirkungsgrad eines Röhrchenwärmetauschers dadurch erhöht werden kann, daß in der Matrix Profilröhrchen mit besonders schlankem Lanzettquerschnitt verwendet werden.From DE-OS 33 27 660 a tube of this type is known, which is divided into two chambers by a transverse web running centrally in the direction of the small ellipse axis (two-chamber profile). In the case of profile tubes made of thin-walled sheet metal, such a crosspiece serves both to stiffen the tube in order to prevent bulging of the slightly curved tube walls and to increase the degree of heat exchange. It has now been shown that the efficiency of a tube heat exchanger can be increased by using profile tubes with a particularly slim lancet cross section in the matrix.
Aufgabe der vorliegenden Erfindung ist es deshalb, ein Profilröhrchen der gattungsgemäßen Art zu schaffen, welches bei schlanker Kontur in der Lage ist, hohem Innendruck standzuhalten, einen hohen Wärmeaustauschgrad zuzulassen und dabei auch im Inneren möglichst geringe Strömungsverluste zu verursachen.The object of the present invention is therefore to create a profile tube of the generic type which is capable of high with a slim contour Withstanding internal pressure, allowing a high degree of heat exchange and thereby causing as little flow loss as possible inside.
Erfindungsgemäß wird die gestellte Aufgabe von einer gattungsgemäßen Profilröhrchen gelöst, welches wenigstens zwei in Richtung der kleinen Ellipsenachse den Innenraum mit Abstand voneinander durchsetzende Querstege aufweist.According to the invention, the object is achieved by a generic profile tube which has at least two transverse webs penetrating the interior at a distance from one another in the direction of the small ellipse axis.
Die erfindungsgemäße Unterteilung des Profilröhrchens in mindestens drei Kammern bringt gegenüber einem Zweikammerprofil eine beträchtliche Verbesserung der Strömungs- und Wärmetauschbedingungen. Besonders bei Profilröhrchen größeren Querschnitts für Wärmetauscher großer Abmessungen kann aufgrund der Mehrkammerbauweise gleich geringe Blechstärke verwendet werden wie bei kleinen Profilröhrchen in Zweikammerbauweise ohne daß dadurch die Steifigkeit gegen Ausbeulen unzulässig herabgesetzt würde.The subdivision of the profile tube into at least three chambers according to the invention brings about a considerable improvement in the flow and heat exchange conditions compared to a two-chamber profile. Particularly in the case of profile tubes of larger cross section for heat exchangers of large dimensions, the multi-chamber construction means that the same thin sheet thickness can be used as for small profile tubes in a two-chamber construction without the stiffness against bulging being inadmissibly reduced.
Im weiteren bezieht sich die Erfindung auf ein Verfahren zur Herstellung mit Profilröhrchen mit elliptischem oder lanzettformigem Querschnitt für Röhrchenwärmetauscher mit wenigstens zwei in Richtung der kleinen Ellipsenachse den Innenraum mit Abstand voneinander durchsetzenden Querstegen durch Biegen von endlosem Metallband und nachfolgendes Fügen der freien Kanten. Ein solches Verfahren ist für ein Zweikammerprofil durch die obengenannte DE-OS 33 27 660 offenbart.Furthermore, the invention relates to a process for the production with profile tubes with an elliptical or lancet-shaped cross section for tube heat exchangers with at least two transverse webs penetrating the interior in the direction of the small axis of the ellipse at a distance from one another by bending endless metal strip and subsequently joining the free edges. Such a method is disclosed for a two-chamber profile by the above-mentioned DE-OS 33 27 660.
Ausgehend von dem vorbekannten Herstellungsverfahren ist es Aufgabe der vorliegenden Erfindung ein für Mehrkammerprofile geeignetes Verfahren anzugeben, welches unter Berücksichtigung der zu verarbeitenden sehr ge ringen Wandstärken sowohl hohe Maßgenauigkeit der hergestellten Profilröhrchen garantiert als auch im Hinblick auf die Anzahl der gewünschten Kammern anpassungsfähig ist und darüber hinaus hohe Ausstoßquoten zuläßt.Starting from the previously known manufacturing method, it is the object of the present invention to provide a method which is suitable for multi-chamber profiles and which, taking into account the very ge to be processed wrestle wall thicknesses both guarantee high dimensional accuracy of the manufactured profile tubes and are adaptable with regard to the number of desired chambers and also allow high output rates.
Erfindungsgemäß wird die gestellte Aufgabe dadurch gelöst, daß zunächst zwei kongruentes Profil aufweisende Halbzeuge gebogen werden, das etwa die Form eines gleichschenkligen Dreiecks mit abgerundeter Spitze und mit einem über die Basis hinaus verlängerten Schenkel aufweist und diese Halbzeuge dann so aneinander gesetzt werden, daß die freien Enden der verlängerten Schenkel jeweils an der Basiskante des anderen Halbzeugs anliegen.According to the invention the object is achieved in that first two congruent profile semi-finished products are bent, which has approximately the shape of an isosceles triangle with a rounded tip and with a leg extended beyond the base, and these semi-finished products are then placed together so that the free The ends of the extended legs rest against the base edge of the other semi-finished product.
Mit dem erfindungsgemäßen Verfahren lassen sich die gestellten Anforderungen voll erfüllen, und es gewährleistet darüber hinaus noch geringen vorrichtungstechnischen Aufwand, da durch den Aufbau aus zwei kongruenten Halbzeugen erreicht wird, daß nur ein einziges, relativ einfaches Profil gebogen werden muß.With the method according to the invention, the requirements can be fully met, and it also ensures a low outlay in terms of device technology, since the construction from two congruent semi-finished products means that only a single, relatively simple profile has to be bent.
Eine erfindungsgemäße Weiterbildung dieses Verfahrens besteht darin, daß zur Herstellung von Profilröhrchen mit 2 + n Querstegen zwischen die beiden Halbzeuge n Zwischenteile mit Rechtwinkel-Z-Kontur und frcicn Schenkeln zwischengefügt werden. Auf diese Weise lassen sich Mehrkammerlanzettprofile mit maximal zwei unterschiedlich gebogenen Profilhalbzeugen aufbauen, wodurch der fertigungstechnische Aufwand niedrig gehalten werden kann.A further development of this method according to the invention is that n intermediate parts with a right-angled Z-contour and frcicn legs are interposed between the two semi-finished products to produce profile tubes with 2 + n crosspieces. In this way, multi-chamber lancet profiles can be constructed with a maximum of two differently curved semi-finished products, which means that the manufacturing outlay can be kept low.
Gemäß einer ersten bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens erfolgt das Biegen der Halbzeuge, indem das anfänglich ebene Metallband zunächst in eine Rechtwinkel-Z-Kontur mit zwei freien Schenkeln geformt wird und danach der längere der freien Schenkel bei etwa halber Schenkellänge um mehr als 90° soweit gebogen wird, daß seine Endkante an der vom Z-Steg und dem anderen freien Schenkel gebildeten Basiskante anliegt.According to a first preferred embodiment of the method according to the invention, the semi-finished products are bent by initially shaping the initially flat metal strip into a right-angled Z contour with two free legs and then the longer of the free legs at about half the length of the leg, it is bent by more than 90 ° so that its end edge lies against the base edge formed by the Z-web and the other free leg.
Vorteilhaft ist diese Art der Biegung des Halbzeugs insbesondere im Hinblick auf die nachträgliche Fügung, da die zu fügenden Kanten im Bereich ebener bzw. leicht konvex gewölbter Oberflächen liegen und somit besonders leicht zugänglich sind.This type of bending of the semifinished product is particularly advantageous with regard to subsequent joining, since the edges to be joined lie in the area of flat or slightly convex surfaces and are therefore particularly easily accessible.
Alternativ zum vorstehend aufgezeigten Biegen der Halbzeuge kann nach einer weiteren Ausführungsform der Erfindung ein Halbzeug in der Weise geformt werden, daß das anfänglich ebene Metallband zunächst zu einem Rechtwinkelprofil mit einem die Länge des Querstegs aufweisenden kürzeren Schenkel und einem längeren Schenkel gebogen wird und dann der längere Schenkel um eine Stelle, die weniger als die halbe Schenkellänge vom Rechtwinkelscheitel entfernt liegt um mehr als 90° soweit gebogen wird, bis er an dem freien Ende des kürzeren Schenkels anliegt. Diese Art der Biegung des Halbzeugs hat den Vorteil, daß das ebene Blechband Biegungen nur in einer Richtung unterzogen wird.As an alternative to the bending of the semifinished products shown above, according to a further embodiment of the invention, a semifinished product can be shaped in such a way that the initially flat metal strip is first bent to a right-angled profile with a shorter leg and a longer leg that has the length of the crosspiece, and then the longer one Leg is bent by a point that is less than half the length of the leg from the apex of the right angle by more than 90 ° until it rests against the free end of the shorter leg. This type of bending of the semi-finished product has the advantage that the flat sheet metal strip is only subjected to bending in one direction.
Vorzugsweise soll die Entfernung der Biegestelle vom Rechtwinkelscheitel etwa 1/3 der Schenkellänge des längeren Schenkels betragen, was zur Folge hat, daß die Länge der drei Kammern des fertigen Profilröhrchens jeweils etwa dieselbe ist.Preferably, the distance of the bending point from the right-angle apex should be about 1/3 of the leg length of the longer leg, which has the consequence that the length of the three chambers of the finished profile tube is approximately the same in each case.
Besonders im Hinblick auf eine durch Schweißung erfolgende Fügung der freien Kanten ist es vorteilhaft, wenn die freien Schenkel der Halbzeuge und der Zwischenteile nach außen aufgebogene Endkanten aufweisen.Particularly with a view to joining the free edges by welding, it is advantageous if the free legs of the semi-finished products and the intermediate parts have end edges bent outwards.
Obwohl das erfindungsgemäße Verfahren in der Weise durchgeführt werden kann, daß die dreieckförmigen Hohlprofile der beiden Halbzeuge durch Fügen zuerst verschlossen werden und dann die Halbzeuge miteinander bzw. unter Zwischenfügung von Zwischenteilen gefügt werden, ist es vorteilhaft, wenn die Fügung jedes Halbzeugs als auch die Fügung der Halbzeuge miteinander bzw. mit dem Zwischenteil in demselben Arbeitsgang erfolgt. Dadurch wird die Herstellung von Endlosprofilröhrchen erleichtert.Although the method according to the invention can be carried out in such a way that the triangular hollow profiles of the two semi-finished products are first closed by joining and then the semi-finished products are joined to one another or with the interposition of intermediate parts, it is advantageous if the joining of each semi-finished product and the joining the semi-finished products with each other or with the intermediate part in the same operation. This facilitates the production of continuous profile tubes.
Die erfindungsgemäße Profilform und das erfindungsgemäße Verfahren werden anhand der beigefügten Zeichnungen näher erläutert.The profile shape according to the invention and the method according to the invention are explained in more detail with reference to the accompanying drawings.
In den Zeichnungen zeigt:
- Fig. 1 erfindungsgemäße Profilröhrchen im Matrixverband im Querschnitt,
- Fig. 2 zur Fügung aneinandergesetzte Halbzeuge für ein Profilröhrchen nach Fig. 1 in einer ersten Ausführungsform,
- Fig. 3 zur Fügung aneinandergesetzte Halbzeuge für das Profilröhrchen nach Fig. 1 in einer zweiten Ausführungsform,
- Fig. 4 die Biegung eines dünnwandigen Blechs zum Halbzeug nach Fig. 2,
- Fig. 5 die Biegung eines dünnwandigen Blechs zum Halbzeug nach Fig. 3,
- Fig. 6 die Zusammenstellung von fertig gebogenen Halbzeugen zu einem Profilröhrchen mit drei Querstegen und
- Fig. 7 eine Anordnung entsprechend Fig. 6 in einer weiteren Ausführungsform.
- 1 profile tube according to the invention in matrix cross-section,
- 2 for joining semi-finished products for a profile tube according to FIG. 1 in a first embodiment,
- 3 for joining semi-finished products for the profile tube according to FIG. 1 in a second embodiment,
- 4 shows the bending of a thin-walled sheet to the semi-finished product according to FIG. 2,
- 5 shows the bending of a thin-walled sheet to the semi-finished product according to FIG. 3,
- Fig. 6 shows the assembly of finished semi-finished products to a profile tube with three crosspieces and
- FIG. 7 shows an arrangement corresponding to FIG. 6 in a further embodiment.
In Fig. 1 sind drei Profilröhrchen r einer Röhrchenwärmetauschermatrix in ihrer gestaffelten Anordnung dargestellt, eines davon im Querschnitt, die anderen beiden nur im Umriß. Erfindungsgemäß weist das im Querschnitt dargestellte elliptische Profilröhrchen zwei in Richtung der kleinen Ellipsenachse k den Innenraum mit Abstand voneinander durchsetzende Querstege q auf. Dadurch entstehen zwei etwa dreieckförmige Hohlräume zu beiden Stirnseiten eines etwa rechteckförmigen Hohlraums. Aus Fig. 1 ist erkennbar, daß das dargestellte sogenannte Dreikammerprofil bereits die Form einer sehr schlanken Ellipse aufweist, deren Wandpartien entsprechend geringfügig gewölbt sind. Entsprechend läßt sich mit einem Mehrkammerprofil, welches 2 + n Querstege aufweist, eine noch schlankere Röhrchenkontur darstellen.In Fig. 1, three profile tubes r of a tube heat exchanger matrix are shown in their staggered arrangement, one of them in cross section, the other two only in outline. According to the invention, the elliptical profile tube shown in cross section has two transverse webs q which penetrate the interior at a distance from one another in the direction of the small ellipse axis k. This creates two approximately triangular cavities on both ends of an approximately rectangular cavity. From Fig. 1 it can be seen that the so-called three-chamber profile shown already has the shape of a very slim ellipse, the wall parts of which are correspondingly slightly curved. Accordingly, with a multi-chamber profile, which has 2 + n crossbars, an even slimmer tube contour can be represented.
Die Darstellung nach Fig. 2 veranschaulicht eine erste erfindungsgemäße Herstellungsart eines Profilröhrchens gemäß Fig. 1. Demnach werden durch Biegen von endlosem Metallband die beiden kongruentes Profil aufweisenden Halbzeuge 2, 3 geformt, von denen jedes etwa die Form eines gleichschenkeligen Dreiecks mit abgerundeter Spitze und mit einem über die Basis 20, 30 hinaus verlängerten Schenkel 23 bzw. 33 aufweist. Diese Halbzeuge 2, 3 sind so aneinandergesetzt, daß die freien Enden 22, 32 der verlängerten Schenkel 23, 33 jeweils an der Basiskante 25, 35 des anderen Halbzeugs anliegen. Die in Fig. 2 noch als offene Spalte dargestellten Stoßstellen an den Kanten 25, 26, 35, 36 werden durch Schweißung oder Lötung verschlossen.The illustration according to FIG. 2 illustrates a first production method according to the invention for a profile tube according to FIG. 1. Accordingly, the two congruent profile
Die Biegung der in Fig. 2 dargestellten Halbzeuge 2, 3 erfolgt, wie aus Fig. 4 hervorgeht, in der Weise, daß das anfänglich ebene Metallband zunächst in eine Rechtwinkel-Z-Kontur mit den freien Schenkeln 21, 23 geformt wird und danach der längere der freien Schenkel bei etwa halber Schenkellänge soweit gebogen wird, daß seine Endkante 24 an der Basiskante 26 anliegt. In voll ausgezogenen Linien ist die Rechtwinkel-Z-Kontur dargestellt, die Biegung des längeren Schenkels 21 ist strichliert angedeutet.The
Aus den Fig. 3 und 5 ergibt sich eine zweite Herstellungsart eines elliptischen Profilröhrchens gemäß Fig. 1. Wie bei der ersten Herstellungsart nach Fig. 2 werden wiederum zwei kongruentes Profil aufweisende Halbzeuge 2, 3 gebogen und so zusammengesetzt, daß das Gesamtprofil des Röhrchens nach Fig. 1 entsteht. Anders als bei der Herstellungsart nach Fig. 2 bzw. Fig. 4 wird ein Halbzeug jedoch in der Weise geformt, daß das anfänglich ebene Metallband zunächst zu einem Rechtwinkelprofil mit einem die Länge des Querstegs q des Profilröhrchens aufweisenden kürzeren Schenkel 20 und einem längeren Schenkel 21 gebogen wird. Der längere Schenkel 21 wird dann um eine Stelle, die weniger als die halbe Schenkellänge vom Rechtwinkelscheitel 25 entfernt liegt, soweit gebogen, bis er an dem freien Ende des kürzeren Schenkels 20 anstößt. Die Wanderung der Endkante des längeren Schenkels 21 ist in Fig. 5 mit einer strichlierten Linie und Pfeil angedeutet. Vorzugsweise liegt die Stelle, an der der längere Schenkel 21 abgebogen wird, etwa bei 1/3 der gesamten Schenkellänge. Dadurch wird dann beim fertigen Profilröhrchen die mittlere rechteckige Kammer etwa gleich lang wie die beiden äußeren dreieckigen Kammern.3 and 5, a second type of manufacture of an elliptical profile tube according to FIG. 1 results. As in the first method of manufacture according to FIG. 2, two
In Fig. 6 ist die Herstellung eines elliptischen Profilröhrchens mit vier Kammern dargestellt. Die Gesamt kontur dieses Profilröhrchens wird dabei aus zwei oben beschriebenen kongruenten Halbzeugen 2, 3 und einem Zwischenteil 1 gebildet, welches Rechtwinkel-Z-Kontur mit freien Schenkeln 11, 13 aufweist. Der Z-Steg des Zwischenteils 1 ist mit 10 bezeichnet. Die übrigen Bezugszeichen sind wie in Fig. 2 gewählt. Das fertige Profilröhrchen entsteht, wie oben ausgeführt, durch Schweißen oder Löten der Stoßspalte. Profilröhrchen mit noch größerer Länge in Richtung der großen Ellipsenachse g können dadurch erzeugt werden, daß mehrere Zwischenteile 1 in analoger Weise zwischen die beiden Halbzeuge 2, 3 eingesetzt werden. Die in Fig. 7 gezeigte Ausführungsform der zur Röhrchenkontur zusammengesetzten Halbzeuge unterscheidet sich von der Ausführungsform nach Fig. 6 lediglich dadurch, daß die zu fügenden freien Schenkel der Halbzeuge 2, 3 und des Zwischenteils 1 nach außen aufgebogene Endkanten 27 aufweisen. Eine solche Konturierung erweist sich als besonders vorteilhaft für die Durchführung der Schweißverbindungen.6 shows the production of an elliptical tube with four chambers. The total Contour of this profile tube is formed from two above-described congruent
Abschließend sei darauf hingewiesen, daß die Fig. jeweils stark vergrößerte Darstellungen der herzustellenden Profilröhrchen enthalten. Die Erstreckung der elliptischen Querschnittskontur beträgt in Richtung der großen Ellipsenachse etwa 10 mm, in Richtung der kleinen Ellipsenachse etwa 3 mm und die Wandstärke der verwendeten Bleche liegt im Bereich zwischen 0,2 und 0,4 mm.In conclusion, it should be pointed out that the figures each contain greatly enlarged representations of the profile tubes to be produced. The extent of the elliptical cross-sectional contour is approximately 10 mm in the direction of the large ellipse axis, approximately 3 mm in the direction of the small ellipse axis and the wall thickness of the sheets used is in the range between 0.2 and 0.4 mm.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3610618 | 1986-03-29 | ||
DE19863610618 DE3610618A1 (en) | 1986-03-29 | 1986-03-29 | PROFILE TUBE WITH ELLIPTICAL OR LANZETT-SHAPED SECTION FOR TUBE HEAT EXCHANGER AND METHOD FOR THE PRODUCTION THEREOF |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0239814A2 true EP0239814A2 (en) | 1987-10-07 |
EP0239814A3 EP0239814A3 (en) | 1990-03-21 |
EP0239814B1 EP0239814B1 (en) | 1993-11-03 |
Family
ID=6297515
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87102993A Expired - Lifetime EP0239814B1 (en) | 1986-03-29 | 1987-03-03 | Profiled tube having an elliptical or lancet-shaped cross-section, for use in tubular heat exchangers, and method for its manufacture |
Country Status (5)
Country | Link |
---|---|
US (1) | US4766953A (en) |
EP (1) | EP0239814B1 (en) |
JP (1) | JPH0739915B2 (en) |
DE (2) | DE3610618A1 (en) |
ES (1) | ES2047478T3 (en) |
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US20100006276A1 (en) * | 2008-07-11 | 2010-01-14 | Johnson Controls Technology Company | Multichannel Heat Exchanger |
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CN104567505A (en) * | 2015-01-17 | 2015-04-29 | 武汉英康汇通电气有限公司 | Heat exchange tube, manufacturing method of heat exchange tube, heat exchange module and heat exchanger |
WO2020005162A1 (en) * | 2018-06-29 | 2020-01-02 | National University Of Singapore | Heat exchange unit and method of manufacture thereof |
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- 1987-03-03 DE DE87102993T patent/DE3787984D1/en not_active Expired - Fee Related
- 1987-03-03 ES ES87102993T patent/ES2047478T3/en not_active Expired - Lifetime
- 1987-03-23 JP JP62065898A patent/JPH0739915B2/en not_active Expired - Lifetime
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US6230533B1 (en) | 1998-12-11 | 2001-05-15 | Valeo Thermique Moteur | Folded tube for a heat exchanger and method for shaping it |
Also Published As
Publication number | Publication date |
---|---|
DE3787984D1 (en) | 1993-12-09 |
ES2047478T3 (en) | 1994-03-01 |
EP0239814B1 (en) | 1993-11-03 |
DE3610618A1 (en) | 1987-10-01 |
EP0239814A3 (en) | 1990-03-21 |
US4766953A (en) | 1988-08-30 |
JPS62233690A (en) | 1987-10-14 |
JPH0739915B2 (en) | 1995-05-01 |
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