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EP0131594B1 - Blade body with hollow blades, method and machine for the production thereof - Google Patents

Blade body with hollow blades, method and machine for the production thereof Download PDF

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Publication number
EP0131594B1
EP0131594B1 EP84900383A EP84900383A EP0131594B1 EP 0131594 B1 EP0131594 B1 EP 0131594B1 EP 84900383 A EP84900383 A EP 84900383A EP 84900383 A EP84900383 A EP 84900383A EP 0131594 B1 EP0131594 B1 EP 0131594B1
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EP
European Patent Office
Prior art keywords
rib
hollow
mouldings
flow
corrugations
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.)
Expired
Application number
EP84900383A
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German (de)
French (fr)
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EP0131594A1 (en
Inventor
Hermann Wild
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.)
Zschokke Wartmann AG
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Zschokke Wartmann AG
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.)
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Priority to AT84900383T priority Critical patent/ATE21465T1/en
Publication of EP0131594A1 publication Critical patent/EP0131594A1/en
Application granted granted Critical
Publication of EP0131594B1 publication Critical patent/EP0131594B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/025—Constructional details relating to cooling

Definitions

  • the invention relates to a rib body made of a one-piece sheet metal, in particular for a transformer tank, in which spaced, parallel hollow ribs are formed, the legs of which are closed on the end faces between the rib back and the webs connecting the legs of adjacent ribs, a method and a machine for the production of this rib body.
  • Rib bodies with hollow ribs are required to a considerable extent, in particular for the manufacture of transformer tanks.
  • a cooling liquid usually a mineral oil.
  • the arrangement of cooling fins in the fin bodies serves to dissipate the heat generated by the transformer to a sufficient extent to the ambient air.
  • hollow ribs of great height are formed in the rib bodies.
  • the ribbed bodies In order to be able to withstand the mechanical stresses that occur during operation, the ribbed bodies must have sufficient strength and stability.
  • the walls of the hollow ribs are stiffened by inserting metal rods between the walls of each hollow rib and welding them to the walls.
  • This solution is relatively complex since, in addition to the press for folding the ribs, an insertion device for the metal rods and a welding device are required.
  • the walls of the hollow ribs are reinforced by beads which are embossed in the rib body made of a metal strip before the ribs are folded.
  • an additional device with a corresponding space requirement is required for embossing the beads, it is also necessary to control this device in such a way that the beads are embossed in the correct place, for which a correspondingly high outlay is required.
  • the walls of hollow ribs are also stiffened by beads. These beads are also intended to achieve better guidance of the cooling liquid and thus better cooling. But even in this embodiment, the effort to manufacture the beads is expensive because the beads must be stamped in at certain points, which requires appropriate control of the device for stamping the beads.
  • the stiffeners in so far as they are elongated beads or stiffening parts, are arranged parallel to the rib back and thus parallel to the flow in order to thereby offer the smallest possible obstacle to the flow.
  • the rib body 1 shown in FIG. 1 is made, for example, from a strip plate and has any number of hollow ribs of relatively great height.
  • the hollow ribs 2 have two legs 3, which on the one hand form a rib back 4 at one end and, on the other hand, are connected at the other end by webs 5 to the legs 3 of the adjacent hollow rib 2.
  • the legs 3 of the hollow ribs 2 are together, e.g. welded together and form a tight seal.
  • beads are formed in the form of trough-shaped depressions 7 which extend at least over part of the rib height.
  • the beads 7 extend directly from the web area to the rib back area, i.e. over the entire height of the leg 3.
  • the beads 7 extend perpendicular to the rib back 4. Since, in the case of transformer tanks, which represent a preferred area of application of the fin bodies 1, the flow takes place parallel to the fin back 4, this means that the beads 7 run transversely to the direction of flow. It has now Surprisingly, it has been shown that these beads which run transversely to the coolant flow do not in any way impede the circulation of the coolant, but also improve the heat transfer to the outside air. This phenomenon can possibly be explained by the boundary layer of the cooling medium on the wall, within which both the flow rate and the temperature show their greatest change. If the surface of the legs 3 is smooth, the boundary layer remains undisturbed over the entire surface, so that the cooling liquid with the highest temperature flows inside the hollow fin. The beads 7 running transversely to the flow form an obstacle behind which turbulence arises, which ensures better transport of the warmer coolant in the interior of the hollow fin against the wall surface.
  • Adequate dimensional stability of the hollow ribs 2 is also achieved with the beads 7. It is expedient here that the beads 7 are not too narrow.
  • a suitable solution is, for example, the trapezoidal configuration of the beads 7. However, another, e.g. rectangular or semicircular cross-section can be selected for the beads 7.
  • FIG. 3 It is also possible, see FIG. 3, to use rib-shaped elevations 8 as beads.
  • the beads 8 lie here at the same locations as in FIG. 1 the depressions 7.
  • the beads 7 and 8 can extend not only over the legs 3, but also over the rib back 4 and over the webs 5, as shown in the first rib on the left edge of the picture.
  • the beads 7 and 8 can be molded in a relatively simple manner in the manufacture of the folds from the band plate. If the beads 7 or 8 are to extend over the entire surface of the rib body 1, the beads can be produced by rolling before the folds are formed. If, on the other hand, the beads 7 or 8 are only to be formed on the legs 3, the pressing tools can be designed accordingly, e.g. by attaching ribs to the press punches and recesses in the folding sword. The production in the latter case is particularly cheap, since no additional space and no additional surgery is required.
  • the beads 7 and 8 of a hollow rib 2 When pressing the beads, it is also possible without difficulty to arrange the beads 7 and 8 of a hollow rib 2 not opposite, but offset, which may be desirable to achieve increased strength of the hollow rib 2. In both cases, however, no additional space and no control means are required for forming the beads 7 or 8.
  • the molding of beads is a particularly simple and cost-saving solution.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

A blade body (1) comprised of hollow blades (2) and bridges provided therebetween has at least on the sides (3) of the hollow blades (2) mouldings extended perpendicularly to the blade back (4) and shaped as conduit cavities (7) or rib elevations (8). The mouldings (7) are extended perpendicularly to the blade back (4) of the hollow blades (2). The blade body (1) is mainly used in transformer tanks and is also used to cool active elements situated in a cooling liquid inside the tank. In the hollow blades (2) arranged perpendicularly, a cooling liquid flow is generated in parallel to the blade back (4). Despite the mouldings which are extended transversely with respect to the flow, the cooling action of known hollow blades is similar to that of the mouldings parallel to the flow. The advantage of the mouldings extended transversely with respect to the flow is the following: contrary to the mouldings parallel to the flow, the mouldings transversal to the flow may be produced without additional control mechanisms or installations before or during the bending of the hollow blades.

Description

Die Erfindung betrifft einen Rippenkörper aus einem einstückigen Blech, insbesondere für Transformatorkessel, in welchem mit Abstand angeordnete, parallel verlaufende Hohlrippen geformt sind, deren Schenkel an den Stirnseiten zwischen dem Rippenrücken und den die Schenkel benachbarter Rippen verbindenden Stegen geschlossen sind, ein Verfahren und eine Maschine zur Herstellung dieses Rippenkörpers.The invention relates to a rib body made of a one-piece sheet metal, in particular for a transformer tank, in which spaced, parallel hollow ribs are formed, the legs of which are closed on the end faces between the rib back and the webs connecting the legs of adjacent ribs, a method and a machine for the production of this rib body.

Rippenkörper mit Hohlrippen werden in erheblichem Umfang, insbesondere für die Herstellung von Transformatorkesseln, benötigt. Zur Kühlung der im Innern eines solchen Transformatorkessels angeordneten aktiven Bauteile wird der Kessel mit einer Kühlflüssigkeit, meistens einem Mineralöl, gefüllt. Die Anordnung von Kühlrippen in den Rippenkörpern dient dazu, die vom Transformator erzeugte Wärme in ausreichendem Masse an die Umgebungsluft abzuführen. Um die hierfür notwendige grosse Oberfläche zu erreichen, werden in den Rippenkörpern Hohlrippen grosser Höhe geformt.Rib bodies with hollow ribs are required to a considerable extent, in particular for the manufacture of transformer tanks. To cool the active components arranged inside such a transformer tank, the tank is filled with a cooling liquid, usually a mineral oil. The arrangement of cooling fins in the fin bodies serves to dissipate the heat generated by the transformer to a sufficient extent to the ambient air. In order to achieve the large surface area required for this, hollow ribs of great height are formed in the rib bodies.

Die Rippenkörper müssen, um im Betrieb den auftretenden mechanischen Beanspruchungen standhalten zu können, eine ausreichende Festigkeit und Stabilität aufweisen.In order to be able to withstand the mechanical stresses that occur during operation, the ribbed bodies must have sufficient strength and stability.

Man ist aber bestrebt, den Materialaufwand durch Verwendung eines möglichst dünnen Bleches kleinzuhalten. Dies hat zur Folge, dass die Hohlrippen, insbesondere bei grossen Rippentiefen, zur Begrenzung der Durchbiegung der Rippenschenkel unter einem Innendruck bzw. zur Erhöhung ihrer Biegesteifigkeit, z.B. durch das Anbringen von Versteifungen, verstärkt werden müssen.However, efforts are being made to keep the cost of materials low by using the thinnest possible sheet. This has the consequence that the hollow ribs, in particular in the case of large rib depths, to limit the deflection of the rib legs under an internal pressure or to increase their bending stiffness, e.g. by attaching stiffeners.

Bei einer bekannten Ausführungsform (DE-Patentschrift 1 256 785) werden die Wände der Hohlrippen dadurch versteift, dass zwischen den Wänden jeder Hohlrippe Metallstäbe eingelegt und mit den Wänden verschweisst werden. Diese Lösung ist verhältnismässig aufwendig, da neben der presse zum Falten der Rippen eine Einführvorrichtung für die Metallstäbe und eine Schweissvorrichtung benötigt wird.In a known embodiment (DE patent 1 256 785), the walls of the hollow ribs are stiffened by inserting metal rods between the walls of each hollow rib and welding them to the walls. This solution is relatively complex since, in addition to the press for folding the ribs, an insertion device for the metal rods and a welding device are required.

Bei einer weiteren bekannten Ausführungsform (DE-Auslegeschrift 2 244 447) werden die Wände der Hohlrippen durch Sicken, die vor dem Falten der Rippen in den aus einem Metallband hergestellten Rippenkörper eingeprägt werden, verstärkt. Abgesehen davon, dass für das Einprägen der sicken eine zusätzliche Vorrichtung mit entsprechendem Platzbedarf erforderlich ist, ist es auch notwendig, diese Vorrichtung so zu steuern, dass die Sicken an der richtigen Stelle eingeprägt werden, wozu ein entsprechend hoher Aufwand erforderlich ist.In a further known embodiment (DE-Ausletschrift 2 244 447) the walls of the hollow ribs are reinforced by beads which are embossed in the rib body made of a metal strip before the ribs are folded. In addition to the fact that an additional device with a corresponding space requirement is required for embossing the beads, it is also necessary to control this device in such a way that the beads are embossed in the correct place, for which a correspondingly high outlay is required.

Bei einer dritten bekannten Ausführungsform (DE-Offenlegungsschrift 2 749 508) werden ebenfalls die Wände von Hohlrippen-durch Sicken versteift. Durch diese Sicken soll zuden eine bessere Führung der Kühlflüssigkeit und dadurch eine bessere Kühlung erreicht werden. Aber auch bei dieser Ausführungsform ist der Aufwand zur Herstellung der Sicken deshalb aufwendig, weil das Einprägen der Sicken an bestimmten Stellen erfolgen muss, was eine entsprechende Steuerung der Vorrichtung für das Prägen der Sicken erforderlich macht.In a third known embodiment (DE-Offenlegungsschrift 2 749 508) the walls of hollow ribs are also stiffened by beads. These beads are also intended to achieve better guidance of the cooling liquid and thus better cooling. But even in this embodiment, the effort to manufacture the beads is expensive because the beads must be stamped in at certain points, which requires appropriate control of the device for stamping the beads.

In den Hohlrippen der Rippenkörper erfolgt die Strömung der Kühlflüssigkeit parallel zum Rücken der Hohlrippen. Aus diesem Grunde werden bei den bekannten Ausführungen die Versteifungen, soweit es sich um längliche Sicken oder Versteifungsteile handelt, parallel zum Rippenrücken und damit parallel zur Strömung angeordnet, um dadurch der Strömung ein möglichst kleines Hindernis zu bieten.In the hollow fins of the fin bodies, the flow of the cooling liquid takes place parallel to the back of the hollow fins. For this reason, the stiffeners, in so far as they are elongated beads or stiffening parts, are arranged parallel to the rib back and thus parallel to the flow in order to thereby offer the smallest possible obstacle to the flow.

Hier setzt die Erfindung ein, der die Aufgabe zugrundeliegt, einen Rippenkörper der eingangs beschriebenen Art so auszugestalten, dass der Aufwand für die Herstellung der Versteifungen an den Hohlrippen des Rippenkörpers wesentlich herabgesetzt und hierbei trotzdem mindestens derselbe Wärmeübergang an die Aussenluft wie bei den bekannten Ausführungen erreicht wird.This is where the invention comes in, which is based on the object of designing a rib body of the type described at the outset in such a way that the outlay for producing the stiffeners on the hollow ribs of the rib body is substantially reduced and nevertheless at least the same heat transfer to the outside air as in the known designs is achieved becomes.

Diese Aufgabe wird gemäss der Erfindung dadurch qelöst, dass mindestens an einem Teil der Hohlrippen des Rippenkörpers Versteifungen vorgesehen sind, die senkrecht zu dem Rippenrücken verlaufen.This object is achieved according to the invention in that at least part of the hollow ribs of the rib body are provided with stiffeners which run perpendicular to the rib back.

Die Erfindung ist in der Zeichnung in einem Ausführungsbeispiel dargestellt und nachfolgend beschrieben. Es zeigen:

  • Fig. 1 einen Rippenkörper mit Hohlrippen in schematischer, räumlicher Darstellung,
  • Fig. 2 einen Schnitt einer teilweise dargestellten Hohlrippe des Rippenkörpers nach Fig. 1 längs der Linie 11 - II mit einer Versteifung und
  • Fig. 3 einen Schnitt einer teilweise dargestellten Hohlrippe des Rippenkörpers nach Fig. 1 längs der Linie 111 - 111 in Fig. 1 mit einer weiteren Versteifung.
The invention is shown in the drawing in one embodiment and described below. Show it:
  • 1 shows a rib body with hollow ribs in a schematic, spatial representation,
  • Fig. 2 shows a section of a partially shown hollow rib of the rib body according to Fig. 1 along the line 11 - II with a stiffener and
  • 3 shows a section of a partially illustrated hollow rib of the rib body according to FIG. 1 along the line 111-111 in FIG. 1 with a further stiffening.

Der in Fig. 1 dargestellte Rippenkörper 1 ist beispielsweise aus einem Bandblech hergestellt und weist eine beliebige Anzahl von Hohlrippen verhältnismässig grosser Höhe auf. Die Hohlrippen 2 weisen zwei Schenkel 3 auf, die einerseits an einem Ende einen Rippenrücken 4 bilden und andererseits am andern Ende durch Stege 5 mit den Schenkeln 3 der benachbarten Hohlrippe 2 verbunden sind. An den Stirnseiten 6 sind die Schenkel 3 der Hohlrippen 2 miteinander, z.B. durch eine Schweissung, verbunden und bilden einen dichten Abschluss.The rib body 1 shown in FIG. 1 is made, for example, from a strip plate and has any number of hollow ribs of relatively great height. The hollow ribs 2 have two legs 3, which on the one hand form a rib back 4 at one end and, on the other hand, are connected at the other end by webs 5 to the legs 3 of the adjacent hollow rib 2. On the end faces 6, the legs 3 of the hollow ribs 2 are together, e.g. welded together and form a tight seal.

In den Schenkeln 3 der Hohlrippen 2 sind Sicken in Form rinnenförmiger Vertiefungen 7 angeformt, die sich mindestens über einen Teil der Rippenhöhe erstrecken. In Fig. 1 erstrecken sich die Sicken 7 unmittelbar vom Stegbereich bis zum Rippenrückenbereich, d.h. über die gesamte Höhe des Schenkels 3.In the legs 3 of the hollow ribs 2 beads are formed in the form of trough-shaped depressions 7 which extend at least over part of the rib height. In Fig. 1 the beads 7 extend directly from the web area to the rib back area, i.e. over the entire height of the leg 3.

Wesentlich ist hierbei, dass sich die Sicken 7 senkrecht zum Rippenrücken 4 erstrecken. Da bei Transformatorkesseln, die ein bevorzugtes Anwendungsgebiet der Rippenkörper 1 darstellen, die Strömung parallel zum Rippenrücken 4 erfolgt, bedeutet dies, dass die Sicken 7 quer zur Strömungsrichtung verlaufen. Es hat sich nun überraschend gezeigt, dass diese quer zur Kühlflüssigkeitströmung verlaufenden Sicken keineswegs die Zirkulation der Kühlflüssigkeit behindern, sondern zudem eine Verbesserung des Wärmeübergangs an die Aussenluft bewirken. Diese Erscheinung kann möglicherweise durch die Grenzschicht des Kühlmediums an der Wand erklärt werden, innerhalb welcher sowohl die Strömungsgeschwindigkeit, als auch die Temperatur ihre grösste Veränderung aufweisen. Bei glatter Ausbildung der Oberfläche der Schenkel 3 bleibt die Grenzschicht über die ganze Fläche ungestört erhalten, so dass die Kühlflüssigkeit mit der höchsten Temperatur im Innern der Hohlrippe fliesst. Die quer zur Strömung verlaufenden Sicken 7 bilden ein Hindernis, hinter dem eine Turbulenz entsteht, die für einen besseren Transport der wärmeren Kühlflüssigkeit im Innern der Hohlrippe gegen die Wandfläche sorgt.It is essential here that the beads 7 extend perpendicular to the rib back 4. Since, in the case of transformer tanks, which represent a preferred area of application of the fin bodies 1, the flow takes place parallel to the fin back 4, this means that the beads 7 run transversely to the direction of flow. It has now Surprisingly, it has been shown that these beads which run transversely to the coolant flow do not in any way impede the circulation of the coolant, but also improve the heat transfer to the outside air. This phenomenon can possibly be explained by the boundary layer of the cooling medium on the wall, within which both the flow rate and the temperature show their greatest change. If the surface of the legs 3 is smooth, the boundary layer remains undisturbed over the entire surface, so that the cooling liquid with the highest temperature flows inside the hollow fin. The beads 7 running transversely to the flow form an obstacle behind which turbulence arises, which ensures better transport of the warmer coolant in the interior of the hollow fin against the wall surface.

Mit den Sicken 7 wird auch eine ausreichende Formfestigkeit der Hohlrippen 2 erreicht. Hierbei ist es zweckmässig, dass die Sicken 7 nicht zu schmal ausgebildet sind. Eine geeignete Lösung stellt beispielweise die trapezförmige Ausbildung der Sicken 7 dar. Es kann jedoch auch ein anderer, z.B. rechteckförmiger oder halbrunder Querschnitt für die Sicken 7 gewählt werden.Adequate dimensional stability of the hollow ribs 2 is also achieved with the beads 7. It is expedient here that the beads 7 are not too narrow. A suitable solution is, for example, the trapezoidal configuration of the beads 7. However, another, e.g. rectangular or semicircular cross-section can be selected for the beads 7.

Weiter ist es möglich, siehe Fig. 3, rippenförmige Erhebungen 8 als Sicken anzuwenden. Die Sicken 8 liegen hierbei an denselben Stellen wie in Fig. 1 die Vertiefungen 7.It is also possible, see FIG. 3, to use rib-shaped elevations 8 as beads. The beads 8 lie here at the same locations as in FIG. 1 the depressions 7.

In Fig. 1 ist weiter dargestellt, dass die Sicken 7 bzw. 8 sich nicht nur über die Schenkel 3, sondern auch über die Rippenrücken 4 und über die Stege 5 erstrecken können, wie dies bei der ersten Rippe an linken Bildrand dargestellt ist. Die Sicken 7 bzw. 8 können in verhältnismässig einfacher Weise bei der Herstellung der Falten aus dem Bandblech mitgeformt werden. Sollen sich die Sicken 7 bzw. 8 über die gesamte Fläche des Rippenkörpers 1 erstrecken, können die Sicken vor der Bildung der Falten durch Rollen erzeugt werden. Sollen dagegen die Sicken 7 bzw. 8 nur an den Schenkeln 3 geformt werden, können hierzu die Presswerkzeuge entsprechend ausgebildet werden, z.B. durch Anbringen von Rippen an den Press-stempeln und von Vertiefungen im Faltschwert. Die Herstellung im letzteren Fall ist besonders günstig, da kein zusätzlicher Platz und keine zusätzliche Operation erforderlich ist. Beim Pressen der Sicken ist es zudem ohne Schwierigkeit möglich, die Sicken 7 bzw. 8 einer Hohlrippe 2 nicht gegenüberliegend, sondern versetzt anzuordnen, was zum Erreichen einer erhöhten Festigkeit der Hohlrippe 2 erwünscht sein kann. In beiden Fällen sind jedoch für das Anformen der Sicken 7 bzw. 8 kein zusätzlicher Platz und keine Steuermittel erforderlich.In Fig. 1 it is also shown that the beads 7 and 8 can extend not only over the legs 3, but also over the rib back 4 and over the webs 5, as shown in the first rib on the left edge of the picture. The beads 7 and 8 can be molded in a relatively simple manner in the manufacture of the folds from the band plate. If the beads 7 or 8 are to extend over the entire surface of the rib body 1, the beads can be produced by rolling before the folds are formed. If, on the other hand, the beads 7 or 8 are only to be formed on the legs 3, the pressing tools can be designed accordingly, e.g. by attaching ribs to the press punches and recesses in the folding sword. The production in the latter case is particularly cheap, since no additional space and no additional surgery is required. When pressing the beads, it is also possible without difficulty to arrange the beads 7 and 8 of a hollow rib 2 not opposite, but offset, which may be desirable to achieve increased strength of the hollow rib 2. In both cases, however, no additional space and no control means are required for forming the beads 7 or 8.

Für die Anordnung von Versteifungen der Hohlrippen 2, die sich quer zum Rippenrücken 4 bzw. zur Strömung erstrecken, ist das Anformen von Sicken eine besonders einfache und kostensparende Lösung.For the arrangement of stiffeners of the hollow ribs 2, which extend transversely to the rib back 4 or to the flow, the molding of beads is a particularly simple and cost-saving solution.

Claims (10)

1. Ribbed body of a one-piece sheet metal, in particular for transformer tanks, in which spaced, parallel hollow ribs (2) are formed, the limbs (3) of which being closed on the interface (6) between the rip ridge (4) and the webs (5) connecting the limbs of adjacent ribs, characterized in that reinforcements (7, 8) are provided on at least a part of the rib (2), which reinforcements (7, 8) are running perpendicular to the rib ridge (4).
2. Body according to claim 1, characterized in that the reinforcements are corrugations (7, 8) extending at least over a portion of the surface of the hollow ribs (2) of the ribbed body (1).
3. Body according to claim 1 or 2, characterized in that the reinforcements are corrugations (7, 8) extend ove, the limbs (3) of the hollow ribs (2).
4. Body according to claim 2 or 3, characterized in that the corrugations (7, 8) form groove-shaped repressions (7) or groove-shaped elevations (8).
5. Body according to claim 4, characterized in that the repressions (7) or elevations (8) are trapezoid-shaped.
6. Body according to claim 4, characterized in that the corrugations (7, 8) of one of the limbs (3) of a hollow rib (2) is displaced sidewise with regard to the other limb.
7. Method for the production of the rib body defined in one of the claims 1 to 6, in which the hollow ribs (2) are formed one after the other, characterized in that corrugations (7, 8) are impressed on at least a portion of the surface of the hollow ribs (2) of the rib body (1).
8. Method according to claim 7, characterized in that the corrugations (7, 8) are impressed by means of rollers, and that the hollow ribs (2) are formed thereafter.
9. Method according to claim 7, characterized in that the corrugations (7, 8) are pressed together with the hollow ribs (2).
10. Machine for the production of the rib body (1) according to one of the claims 1 to 5, with a folding press, characterized in that the tools for forming the corrugations (7, 8) are placed in the press positions for the folding of the hollow ribs.
EP84900383A 1983-01-19 1984-01-17 Blade body with hollow blades, method and machine for the production thereof Expired EP0131594B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84900383T ATE21465T1 (en) 1983-01-19 1984-01-17 RIBBED BODY WITH HOLLOW RIBS AND METHOD AND MACHINE FOR PRODUCTION THEREOF.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH30683A CH664050A5 (en) 1983-01-19 1983-01-19 Rippenkoerper hollow ribs and method for producing the same and machine for execution of the proceeding.
CH306/83 1983-01-19

Publications (2)

Publication Number Publication Date
EP0131594A1 EP0131594A1 (en) 1985-01-23
EP0131594B1 true EP0131594B1 (en) 1986-08-13

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EP84900383A Expired EP0131594B1 (en) 1983-01-19 1984-01-17 Blade body with hollow blades, method and machine for the production thereof

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EP (1) EP0131594B1 (en)
JP (1) JPS60500354A (en)
CH (1) CH664050A5 (en)
DE (1) DE3460436D1 (en)
WO (1) WO1984003002A1 (en)

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DE10010737A1 (en) * 2000-03-04 2001-09-20 Alstom Radiator for transformer, comprises two sheet metal plates coupled in every second groove, so that volume of cavities can be increased by number of bulges

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US6050329A (en) * 1999-06-21 2000-04-18 Mcgraw Edison Company Cooling fin with reinforcing ripples
JP2015065375A (en) * 2013-09-26 2015-04-09 株式会社ダイヘン Stationary induction apparatus and mountain-shaped member

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CH565358A5 (en) * 1975-03-03 1975-08-15 Paveg Anstalt Aluminium alloy radr for central heating - has steel cladding on inside of waterways for corrosion resistance
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FR674619A (en) * 1928-07-03 1930-01-30 Ferranti Ltd Improvements to radiators or refrigerators
DE2247514A1 (en) * 1972-09-28 1974-04-04 Wuertt Stahlradiatorenfab COOLING RADIATOR FOR OIL TRANSFORMERS
US3902552A (en) * 1973-05-10 1975-09-02 Olin Corp Patterned tubing
CH565358A5 (en) * 1975-03-03 1975-08-15 Paveg Anstalt Aluminium alloy radr for central heating - has steel cladding on inside of waterways for corrosion resistance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10010737A1 (en) * 2000-03-04 2001-09-20 Alstom Radiator for transformer, comprises two sheet metal plates coupled in every second groove, so that volume of cavities can be increased by number of bulges
DE10010737C2 (en) * 2000-03-04 2002-01-10 Alstom Paris Radiator for an electrical transformer

Also Published As

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CH664050A5 (en) 1988-01-29
DE3460436D1 (en) 1986-09-18
WO1984003002A1 (en) 1984-08-02
EP0131594A1 (en) 1985-01-23
JPS60500354A (en) 1985-03-14

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