Process for producing a tank, particularly for transformers

Details Process for producing a tank, particularly for transformers Process for producing a tank, particularly for transformers

1983-12-20

1986-05-20

Godici, Nicholas P.

Metal fusion bonding

Process

Plural joints

2281736, 228138, B23K 3102

Patent

active

045895872

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process for producing a tank, particularly for transformers, which has a parallelepipedic or prismatic shape with casing walls formed from cooling rib elements and a bottom tub, and to a tank produced by this process.
It is known to use oil as a coolant for cooling electrical machines, particularly power transformers. Thus, a tank is provided around the electrical machine and its casing has at least four walls with cooling rib elements and a bottom tub. The upper end is defined by a frame to which is fixed, e.g. screwed a cover for completing the tank. The tank receives the electrical machine and an oil filling and the latter, in the simplest constructional embodiment of the tank, conducts the heat produced by the electrical machine to the outer wall of the tank, where it is convectively transferred to the outer air. In the manufacture of such a tank, the casing walls provided with the ribs and the bottom tub are welded together manually or with the aid of simple equipment. This process makes handling, particularly of the cooling rib elements forming the casing walls much more difficult, as a result of their lack of rigidity. The spread in the dimensions resulting from the lack of rigidity means that more rational manufacture, e.g. by mechanizing the welding of the joins cannot be achieved at an acceptable cost. In another known manufacturing process (German Pat. No. 2,413,617), several side walls are formed from a one-piece, corrugated sheet metal blank forming surface tension, which is chamfered in accordance with the number of faces. This admittedly makes it possible to reduce the welding costs. However, the difficulties due to the high flexibility of the corrugated wall, which more particularly occur in complicated matching and adaptation work when assembling the side walls with the bottom tub are not removed by this process.
The problem of the present invention is therefore to so develop a process of the aforementioned type, that it is not only possible to weld together the individual parts, e.g. the cooling rib elements to the bottom tub, but also to weld together the complete tank in a much simpler manner, so that mechanized or automated welding of the Joints can be achieved with relatively low expenditure. The process according to the invention also makes it possible to improve the quality of the welds.
According to the invention, this problem is solved in that the tank is assembled from individual wall parts, which also have been individually manufactured beforehand. At least one casing wall and one tub side wall are joined together to form a wall part, then, the latter, joined with the other wall parts, are combined to give a tank casng. Appropriately, the individual wall parts are formed from a casing wall, a tub side wall and a frame part, it being possible to reinforce the connection points between the individual parts.
The tank produced by the process according to the invention is characterized in that the wall parts have a flange shaped onto the free end of the tub side wall and frame part.
The invention is described hereinafter relative to an embodiment and the attached drawings, wherein show:
FIG. 1 a cooling rib element formed from a folded over steel plate in a three-dimensional view.
FIG. 2 the cooling rib element according to FIG. 1 with the fitted reinforcements.
FIG. 3 a wall part assembled from a cooling rib element according to FIG. 2, a tub side wall and a frame part, in a three-dimensional view.
FIG. 4 the assembly of two wall parts and their positioning on an assembly surface.
FIG. 5 the construction and positioning of four wall parts on an assembly surface in a three-dimensional view.
FIG. 6 the welded together wall parts according to FIG. 5 with the welded-on tub bottom.
FIGS. 1 to 3 show the manufacture of a wall part, as is used e.g. in the manufacture of a transformer tank. Firstly, a cooling rib element 1 is manufactured. For this purpose, a sheet steel strip having the width of the cooling rib element 1 is unwound from a strip reel and is provid

REFERENCES:
patent: 1515692 (1924-11-01), Mattice
patent: 1743109 (1930-01-01), Borgman
patent: 3168778 (1965-02-01), Ridder
patent: 4298771 (1981-11-01), Olashaw
patent: 4469269 (1984-09-01), Ito et al.

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