Transformer cooling structure

Claim 1

A tank for electrical apparatus submerged in a cooling fluid for transferring heat from said apparatus to walls of the tank for dissipation therefrom, comprising wall means forming a fluid-containing casing, at least a portion of the wall means having inlet and outlet means for said fluid, a cooling panel extending outwardly from said wall means for dissipating heat to an ambient atmosphere, the cooling panel comprising a pair of oppositely disposed sides having facing peripheral edge portions and end portions that are secured together in a fluid-tight seal, the sides being sheet-like members formed to include aligned corrugated surfaces forming spaced fluid-conducting headers and fluid conduits, one of the sides of the oppositely disposed sides having a first outturned flange along the panel edge opposite the peripheral edge portion, the other of said sides having a second outturned flange extending in a direction opposite the first flange, the first and second flanges solely comprising said wall means of the tank with the cooling panel being the sole reinforcement of the wall means against internal pressures within the tank, one header extending from the outlet means and the other header extending from the inlet means, the fluid conduits extending between the spaced headers, whereby volume of cooling fluid space is minimized, and each cooling panel having a portion extending above the outlet means so as to accommodate any expansion of cooling fluid where excess heating occurs.