EP0131594B1 - Corps a ailettes avec ailettes creuses, procede et machine pour leur fabrication - Google Patents

Corps a ailettes avec ailettes creuses, procede et machine pour leur fabrication 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
Authority
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)
English (en)
Other versions
EP0131594A1 (fr
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
Original Assignee
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.)
Filing date
Publication date
Application filed by Zschokke Wartmann AG filed Critical Zschokke Wartmann AG
Priority to AT84900383T priority Critical patent/ATE21465T1/de
Publication of EP0131594A1 publication Critical patent/EP0131594A1/fr
Application granted granted Critical
Publication of EP0131594B1 publication Critical patent/EP0131594B1/fr
Expired legal-status Critical Current

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Classifications

    • 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

Un tel corps à ailettes (1) formé d'ailettes creuses (2) et de ponts situés entre celles-ci possède au moins sur les côtés (3) des ailettes creuses (2) des moulures s'étendant perpendiculairement au dos des ailettes (4) et en forme de cavités en conduits (7) ou d'élévations en nervures (8). Les moulures (7) s'étendent perpendiculairement au dos des ailettes (4) des ailettes creuses (2). Le corps à ailettes (1) trouve sa principale utilisation dans les cuves de transformateur et sert à refroidir les éléments actifs situés dans un liquide de refroidissement à l'intérieur de la cuve. Dans les ailettes creuses (2) disposées perpendiculairement se crée un écoulement de liquide de refroidissement parallèle au dos des ailettes (4). Malgré les moulures qui s'étendent transversalement par rapport à l'écoulement, l'action refroidissante des ailettes creuses connues équivaut à celle des moulures parallèles à l'écoulement. L'avantage des moulures s'étendant transversalement par rapport à l'écoulement est le suivant: au contraire des moulures parallèles à l'écoulement, celles-ci peuvent être fabriquées sans installations ou mécanismes de commande supplémentaires avant ou pendant le pliage des ailettes creuses.

Claims (10)

1. Corps à ailettes réalisé dans une tôle d'une seule pièce, destiné notamment à des cuves de transformateurs, dans lequel sont formées des ailettes creuses (2) parallèles et espacées, dont les montants (3) sont fermés sur leur face frontale (6) entre le dos (4) des ailettes et les traverses (5) reliant les montants des ailettes voisines, caractérisé en ce qu'il est prévu des raidisseurs (7, 8) sur au moins une partie des ailettes creuses (2) du corps à ailettes (1) perpendiculaires au dos (4) des ailettes.
2. Corps à ailettes selon la revendication 1, caractérisé en ce que les raidisseurs sont des moulures s'étendant sur au moins une partie de la surface des ailettes creuses (2) du corps à ailettes (1).
3. Corps à ailettes selon la revendication 1 ou 2, caractérisé en ce que les raidisseurs ou les moulures (7, 8) s'étendent sur les montants (3) des ailettes creuses (2).
4. Corps à ailettes selon la revendication 2 ou 3, caractérisé en ce que les moulures forment des cannelures de renfort (7) ou des nervures en saillie (8).
5. Corps à ailettes selon la revendication 4, caractérisé en ce que les cannelures (7) ou les nervures (8) sont trapézoïdales.
6. Corps à ailettes selon la revendication 4, caractérisé en ce que les moulures (7, 8) de l'un des montants (3) d'une ailette creuse (2) sont décalées latéralement par rapport aux moulures de l'autre montant.
7. Procédé de fabrication du corps à ailettes selon l'une des revendications 1 à 6, dans lequel les ailettes creuses (2) sont formées les unes à la suite des autres, caractérisé en ce que des moulures (7, 8) sont embouties sur au moins une partie de la face des ailettes creuses (2) du corps à ailettes (1).
8- Procédé selon la revendication 7, caractérisé en ce que les moulures (7, 8) sont empreintes par roulage avant que les ailettes creuses (2) soient formées.
9. Procédé selon la revendication 7, caractérisé en ce que les moulures (7, 8) sont embouties en même temps que les ailettes creuses (2).
10. Machine pour la fabrication du corps à ailettes (1) selon l'une des revendications 1 à 5, comportant une presse à plier, caractérisée en ce que les parties d'outil destinées au formage des moulures (7, 8) sont disposées sur les presses de pliage des ailettes creuses.
EP84900383A 1983-01-19 1984-01-17 Corps a ailettes avec ailettes creuses, procede et machine pour leur fabrication Expired EP0131594B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84900383T ATE21465T1 (de) 1983-01-19 1984-01-17 Rippenkoerper mit hohlrippen und verfahren sowie maschine zu dessen herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH30683A CH664050A5 (de) 1983-01-19 1983-01-19 Rippenkoerper mit hohlrippen und verfahren zu dessen herstellung sowie maschine zur ausfuehrung des verfahrens.
CH306/83 1983-01-19

Publications (2)

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

Family

ID=4183996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84900383A Expired EP0131594B1 (fr) 1983-01-19 1984-01-17 Corps a ailettes avec ailettes creuses, procede et machine pour leur fabrication

Country Status (5)

Country Link
EP (1) EP0131594B1 (fr)
JP (1) JPS60500354A (fr)
CH (1) CH664050A5 (fr)
DE (1) DE3460436D1 (fr)
WO (1) WO1984003002A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10010737A1 (de) * 2000-03-04 2001-09-20 Alstom Radiator für einen elektrischen Transformator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6050329A (en) * 1999-06-21 2000-04-18 Mcgraw Edison Company Cooling fin with reinforcing ripples
JP2015065375A (ja) * 2013-09-26 2015-04-09 株式会社ダイヘン 静止誘導機器、及び山形部材

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR674619A (fr) * 1928-07-03 1930-01-30 Ferranti Ltd Perfectionnements aux radiateurs ou réfrigérateurs
DE2247514A1 (de) * 1972-09-28 1974-04-04 Wuertt Stahlradiatorenfab Kuehlradiator fuer oeltransformatoren
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
US3902552A (en) * 1973-05-10 1975-09-02 Olin Corp Patterned tubing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR674619A (fr) * 1928-07-03 1930-01-30 Ferranti Ltd Perfectionnements aux radiateurs ou réfrigérateurs
DE2247514A1 (de) * 1972-09-28 1974-04-04 Wuertt Stahlradiatorenfab Kuehlradiator fuer oeltransformatoren
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 (de) * 2000-03-04 2001-09-20 Alstom Radiator für einen elektrischen Transformator
DE10010737C2 (de) * 2000-03-04 2002-01-10 Alstom Paris Radiator für einen elektrischen Transformator

Also Published As

Publication number Publication date
EP0131594A1 (fr) 1985-01-23
JPS60500354A (ja) 1985-03-14
DE3460436D1 (en) 1986-09-18
WO1984003002A1 (fr) 1984-08-02
CH664050A5 (de) 1988-01-29

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