EP0671748B1 - Wärmetauscher für Gefäss eines eingetauchten elektrischen Transformator - Google Patents
Wärmetauscher für Gefäss eines eingetauchten elektrischen Transformator Download PDFInfo
- Publication number
- EP0671748B1 EP0671748B1 EP95470009A EP95470009A EP0671748B1 EP 0671748 B1 EP0671748 B1 EP 0671748B1 EP 95470009 A EP95470009 A EP 95470009A EP 95470009 A EP95470009 A EP 95470009A EP 0671748 B1 EP0671748 B1 EP 0671748B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- corrugations
- heat exchanger
- tank
- waves
- daughter
- 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 - Lifetime
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Images
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
- H01F27/02—Casings
- H01F27/025—Constructional details relating to cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2215/00—Fins
- F28F2215/06—Hollow fins; fins with internal circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2215/00—Fins
- F28F2215/10—Secondary fins, e.g. projections or recesses on main fins
Definitions
- the present invention relates to the tanks of immersed electrical transformers.
- the invention relates to the manufacture of heat exchangers constituting the wall of these tanks or attached to them, and intended to ensure the cooling of the dielectric liquid in which the electrical part of the transformer is immersed within the tank.
- an "immersed” transformer is a transformer whose electrical part (primary and secondary windings, as well as the magnetic circuit) is cooled by immersion in a liquid, with high dielectric properties, generally a mineral oil, contained in a tank watertight whose side walls, provided with hollow fins, serve as a heat exchanger with the external environment.
- the walls are now usually formed by wavy panels, each panel forming one side of the tank.
- radiators In the case of high power transformers, additional heat exchangers, called radiators, and often formed themselves by corrugated panels, are brought to a distance on the tank. Connection pipes are then provided to allow the circulation of the dielectric liquid between the tank and these external radiators.
- the corrugated panels constituting immersed transformer exchangers are made in one piece and according to a single operation, from a metal strip (generally steel) which is deformed at regular intervals to form parallel, deep folds. The sides of these folds are joined by their edges, which are then closed by sealed welding to form a wave.
- a metal strip generally steel
- a corrugated panel is therefore a component of the manufacture of submerged transformers essentially constituted by a series of parallel waves, distributed along a common base and which, once mounted on the tank, become hollow fins placed in direct communication with the interior volume of the tank containing the dielectric liquid.
- radiators mounted end to end at right angles thus form the side wall of a transformer tank.
- it is a single corrugated panel which, folded in four, can form the complete perimeter of the tank.
- An external radiator is conventionally made up of two identical wavy panels attached to one another along a plane, which is the plane of symmetry of the assembly, and assembled in a sealed manner. The radiator, once finished, is mounted remotely on the tank opposite one side thereof. In general, the two long sides of the tank, or even the four sides, are thus provided with radiators.
- Each end of a corrugated panel whatever its destination (radiator or wall exchanger) is, as we understand it, constituted by a wave - or fin - one side of which faces outwards, the other side being look at the penultimate wave.
- a problem encountered in the manufacture of transformers of the aforementioned type comes from galvanization.
- the galvanizing operation desirable before painting to protect the tank and the radiators, is more and more often required by customers. It consists in immersing the tank and any radiators in a bath of zinc, or zinc alloy, brought to a temperature of 450 ° C and more, then after having extracted them, to let them cool in the open air .
- This standard unit element is produced by shallow stamping with a steel sheet press, which is then paired so that these stampings define two by two of the internal cavities of the element thus produced, in which the fluid can circulate.
- the corresponding redons on the external surface then probably play a role of stiffening ribs sufficient to prevent the appearance of permanent deformation after galvanization.
- JP-A-63 246 808 describes a heat exchanger, constituted by a corrugated panel, having secondary waves provided on the main waves. To avoid distortion of the end waves, they are isolated from the cooling system.
- the invention relates to a method of manufacturing a heat exchanger intended to be gal vanized (or more generally coated by immersion in a bath of molten material at high temperature), constituting exchanger of the wall side of a submerged electric transformer tank, or of an external radiator attached to said wall, and constituted by a corrugated hollow wave panel, characterized in that it consists in replacing the last wave situated at each end of the corrugated panel by a constitutive structure itself of a corrugated panel on a reduced scale which has a main plane wave parallel to the other waves and provided with daughter waves at least on its outer face, spaced one from the next by 3 to 6 cm approximately and having a width of between 3 and 6 cm approximately.
- daughter waves are present on both sides of the main wave.
- the subject of the invention is also a corrugated panel thus produced, according to the characteristics of claim 3, as is any associated transformer or external radiator tank which is made of it.
- these waves-girls fulfill two functions:
- stiffeners which reduce the range of the faces of the wave which carries them and thus prevent its later warping after cooling at the outlet of the galvanizing tank.
- a traditional submerged transformer tank has on its side wall 1 longitudinal cooling fins 3, the mechanical retention of which is ensured by transverse connecting rods 2.
- these fins have the essential role of ensuring the thermal equilibrium of the transformer in operation at a given temperature level.
- these fins are hollow and their internal volume 4 is in direct communication with the enclosure 5 of the tank so as to receive the dielectric liquid with which the latter is filled after the active part has been put in place - not shown- of the transformer (electrical windings and magnetic circuit).
- such a panel is made from a steel strip 12, the width of which defines the height of the waves (fins), and that it is folded at close intervals - conventionally every 4 to 8 cm approximately. -to form parallel and deep folds. After sealing their edges 6 tightly by welding, these folds form the waves which will become the desired hollow cooling fins, once the corrugated panel is mounted on the tank.
- the invention relates specifically to a new design of the terminal waves of such panels intended to become the end fins 7 on the sides of the side wall 1 of the tank and therefore exposed to the outside much more than the central fins 3.
- the invention consists, as clearly shown in FIG. 2, of endowing the external face at least with end waves, referenced 9 in this figure, daughter waves 10.
- daughter waves 11 are also provided on the internal face turned opposite the central waves 3.
- daughter waves 10 are arranged longitudinally on their mother wave 9 and spaced one from the next by 3 to 6 cm approximately, without this being critical for the conservation of flatness.
- Their width is also not a critical meter parameter. It can be chosen between 3 and 6 cm approximately.
- the extent of the external daughter waves 10 must possibly respect the initial size of the tank, while the internal daughter waves 11 must if necessary take into account the proximity of the neighboring 3 waves.
- FIGS. 3 and 4 taken successively in this order:
- Figure 3 shows only the terminal portion of this panel, seen in profile, in a very schematic representation showing the shapes of the elements only.
- the end wave is not formed like the other waves 3, but is replaced by several folds less deep than the folds of waves 3, but made in the same way. and on the same tool.
- these folds are organized in two successive series 13 and 14, the first comprising three folds which will form the internal daughter waves 11, the second having the four folds constituting the external daughter waves 10 of the wave mother 9.
- the corrugated panel After sealing by free sealing of the free edges of the folds formed in the strip 12, the corrugated panel is then ready to be mounted on the tank frame to form one of the sides of the side wall, the aesthetics of which will then be preserved after its immersion in a galvanizing bath.
- the daughter waves on the internal side can have a height of 3 to 5 cm approximately.
- the device for folding the steel strip constituting the corrugated panel will therefore have, if necessary, a space sized accordingly to perform the bending at right angles to the end wave provided with its daughter waves without being hampered by the 'previous wave.
- daughter waves 11 also on the internal face is useful, otherwise it would be this face which, subjected to maximum deformation stresses, would risk undergoing a strong deformation, although, in this case, the appearance aesthetic would suffer only moderately since this face is not very visible, in any case much less than the opposite face.
- the spacing between the daughter waves may be the same on each side.
- the external face 8 'of the end fin 9 will be provided with 4 or 5 daughter waves on a transformer tank of 500 to 1000 KVA of power, for example.
- the waveguide 9 can be formed, no longer by folding around the line B, but from two half waves 16 and 17 assembled by sealed welding 18 of their periphery.
- the end of the half-waves can advantageously be bent at 90 ° to facilitate the positioning of the parts before welding.
- the internal half-wave 17 carries the internal daughter waves 11 coming from the folds 13, while the external half-wave 16 is provided with the external daughter waves 10 coming from the folds 14.
- the invention applies to any fin heat exchanger intended to form one side of the side wall of a tank for transformer, or to form a radiator attached to this tank and which will be coated with a protective material, such as a zinc film, by immersion in a bath of this molten material at high temperature.
- a protective material such as a zinc film
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Transformer Cooling (AREA)
- Coating With Molten Metal (AREA)
Claims (6)
- Verfahren zur Herstellung eines Wärmetauschers, der durch Eintauchen in ein Bad aus geschmolzenem Beschichtungsmaterial hoher Temperatur, z.B. ein Galvanisierbad, beschichtbar ist, für ein Gefäß oder einen Abstrahler eines Tauchtransformators, bestehend aus einer Rippenplatte mit Hohlrippen, dadurch gekennzeichnet, dass es daraus besteht, dass die an jedem Ende der Rippenplatte angeordnete letzte Rippe durch eine Struktur ersetzt wird, die eine Rippenplatte im verkleinerten Maßstab ist und die eine ebene Hauptrippe (9) aufweist, die parallel zu den anderen Rippen (13) verläuft und die wenigstens auf ihrer Außenfläche (16) mit Tochterrippen (10) versehen ist, welche voneinander ungefähr 3 bis 6 cm beabstandet sind und eine Breite von ungefähr 3 bis 6 cm aufweisen.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass auch auf der Innenfläche der Hauptrippe (9) Tochterrippen (11) angeordnet werden.
- Wärmetauscher für ein Gefäß eines elektrischen Tauchtransformators der ausgehend von einer Rippenplatte mit Hohlrippen gebildet ist, dadurch gekennzeichnet, dass die Rippenplatte eine Endrippe (9) aufweist, welche eine Rippenplatte im verkleinerten Maßstab ist wobei sämtliche Innenräume der Tochterrippen (10, 11) mit demjenigen der End-Mutterrippe (9) in Verbindung stehen, an der sie angeordnet sind und wobei sie voneinander ungefähr 3 bis 6 cm beabstandet sind und eine Breite von ungefähr 3 bis 6 cm aufweisen.
- Wärmetauscher nach Anspruch 3, dadurch gekennzeichnet, dass die Endrippe (9) auf beiden Flächen mit Tochterrippen (10, 11) versehen ist.
- Wärmetauscher nach Anspruch 3, dadurch gekennzeichnet, dass die Endrippe (9) aus zwei Halbrippen (16, 17) besteht, die in dichter Weise (18) entlang ihres Umfangs miteinander verbunden sind.
- Wärmetauscher nach Anspruch 5, dadurch gekennezeichnet, dass er die Seitenwand (1) eines Transformatorgefäßes bildet, bei dem wenigstens eine Ecke aus einem Teil (20) besteht, welches aus zwei Halbrippen (17, 17') zusammengesetzt ist, die unter einem rechten Winkel nebeneinander angeordnet sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9402909 | 1994-03-10 | ||
FR9402909A FR2717299B1 (fr) | 1994-03-10 | 1994-03-10 | Echangeur thermique de cuve de transformateur électrique immergé. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0671748A1 EP0671748A1 (de) | 1995-09-13 |
EP0671748B1 true EP0671748B1 (de) | 1997-09-24 |
Family
ID=9460981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95470009A Expired - Lifetime EP0671748B1 (de) | 1994-03-10 | 1995-03-08 | Wärmetauscher für Gefäss eines eingetauchten elektrischen Transformator |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0671748B1 (de) |
AT (1) | ATE158670T1 (de) |
DE (1) | DE69500745T2 (de) |
ES (1) | ES2108547T3 (de) |
FR (1) | FR2717299B1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108766717A (zh) * | 2018-04-16 | 2018-11-06 | 淮北达驰电气科技有限公司 | 一种变压器散热壳体 |
CN108766720A (zh) * | 2018-05-17 | 2018-11-06 | 淮北智淮科技有限公司 | 一种具有防火功能的变压器散热装置 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004040949B4 (de) * | 2004-08-24 | 2007-05-31 | Gessner, Hans-Jürgen | Radiator mit verbesserter Wärmeübertragung |
DE102019216469A1 (de) * | 2019-10-25 | 2021-04-29 | Siemens Energy Global GmbH & Co. KG | Radiator zur Kühlung eines Transformators oder einer Drosselspule |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR649613A (fr) * | 1928-02-23 | 1928-12-26 | Perfectionnement apporté dans l'établissement des échangeurs thermiques | |
JPS63246808A (ja) * | 1987-04-02 | 1988-10-13 | Toshiba Corp | 油入機器のタンク |
FR2697667B1 (fr) * | 1992-11-03 | 1995-01-27 | France Transfo Sa | Panneau ondé de cuve de transformateur électrique immergé, son procédé de réalisation, et son application au montage d'une cuve. |
-
1994
- 1994-03-10 FR FR9402909A patent/FR2717299B1/fr not_active Expired - Fee Related
-
1995
- 1995-03-08 DE DE69500745T patent/DE69500745T2/de not_active Expired - Fee Related
- 1995-03-08 ES ES95470009T patent/ES2108547T3/es not_active Expired - Lifetime
- 1995-03-08 AT AT95470009T patent/ATE158670T1/de not_active IP Right Cessation
- 1995-03-08 EP EP95470009A patent/EP0671748B1/de not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108766717A (zh) * | 2018-04-16 | 2018-11-06 | 淮北达驰电气科技有限公司 | 一种变压器散热壳体 |
CN108766717B (zh) * | 2018-04-16 | 2019-07-09 | 淮北达驰电气科技有限公司 | 一种变压器散热壳体 |
CN108766720A (zh) * | 2018-05-17 | 2018-11-06 | 淮北智淮科技有限公司 | 一种具有防火功能的变压器散热装置 |
CN108766720B (zh) * | 2018-05-17 | 2019-07-09 | 淮北智淮科技有限公司 | 一种具有防火功能的变压器散热装置 |
Also Published As
Publication number | Publication date |
---|---|
ATE158670T1 (de) | 1997-10-15 |
EP0671748A1 (de) | 1995-09-13 |
DE69500745D1 (de) | 1997-10-30 |
DE69500745T2 (de) | 1998-03-05 |
ES2108547T3 (es) | 1997-12-16 |
FR2717299B1 (fr) | 1996-05-10 |
FR2717299A1 (fr) | 1995-09-15 |
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