GB243093A - Improvements in heat exchangers specially applicable for cooling the circulating air of dynamo electric machines and the like - Google Patents

Abstract

243,093. Lancashire Dynamo & Motor Co., Ltd., and McLeod, R. S. Aug. 29, 1924. Dynamos and motors, cooling.-A heatexchanger for cooling the internal air of enclosed dynamo-electric machines, is formed by bending a sheet A of metal into zig-zag form so as to provide two sets of alternately-disposed parallel ducts a<1>, a<2>, and connecting together the ends a<3> of the walls of these ducts in pairs, or by soldering or brazing, so that the two streams of hot and cold air may be passed separately through these ducts. To enable the ends a<3> to be brought together, the ends of the loops are cut away at a<4> and the openings are closed by strips of metal a<6>, a<9> at right-angles. The heat-exchanger is placed in the bed-plate B, which is provided with cast grooves to receive the end-plates a<9> and packing to make a tight joint between the internal and external air streams, which are directed respectively by fans c<1>, c<2> along the paths indicated by arrows, the internal air stream being deflected by partitions a<10>, a<11>, a<13>. In a modification, the sides of the heat-exchanger are formed by plates a<14>, Fig. 10, and grooves to accommodate these are also cast in the bed-plate. According to the Provisional Specification, the heat-exchanger may be mounted above or at the side of the machine, and it may be used for general heat-exchange purposes.