GB667565A - Improvements in the cooling of rotating bodies - Google Patents

Abstract

667,565. Cooling rotary engines; centrifugal fans. AKTIEBOLAGET LJUNGSTROMS ANGTURBIN. June 2, 1948. [June 11, 1947] .No. 14867/48. Classes 110(i) and 110(ii). [Also in Group XXIX] A rotating body, for example, an hydraulic power transmission device, requiring to be cooled, is provided with plurality of annular external cooling fins and intervening grooves, an outer housing shrouding the grooves and interrupted at circumferentially spaced zones and elements mounted to have relative rotation with respect to the fins and projecting into the grooves at the zones of interruption of the housing so as to cause a controlled flow of air or gaseous medium which enters the grooves at one zone of interruption and is removed therefrom by a projecting element at another zone of interruption. A rotary casing 10 comprises members 40, 44 and 46, the member 40 carrying pump blades 18. Turbine blades 24, 26 are carried by a shaft 20 and reaction blades 30 by a member 32 fixed to a stationary housing 34. The member 44 carries cooling fins 46 separated by annular grooves 48. In order to obtain a high relative velocity between the air contained in the grooves and the fins, vane members 70 carrying vanes 72 which project into the grooves are provided. As shown in Fig. 2, there are six vane members spaced around the coupling so that each groove is divided into six parts. With the coupling rotating in the direction of the arrow 80 the air enters by inlets 73 and leaves by outlets 76 Although six vane members are shown a different number could be used and in some cases there could be only one inlet and one outlet. The internal surface 50 of the member 44 is cylindrical and radially spaced from a similar outer surface 52 on the member 42. Between these surfaces a cylindrical baffle plate or drum 54 is located to provide annular channels 56, 58. A series of bores 62 connect the outer part of the chamber 16 of the torque converter with the channel 56, and the channel 58 communicates with the chamber 16 through bores 64 at a place radially inward of the bores 62. The working liquid thus circulates through the bores and passages 62, 56, 58. 64 in the order named. The invention is applicable to torque converters having any desired number of stages or to couplings. The rotating casing may carry the turbine blades. The cooling circuit 62, 56, 58, 64 can be dispensed with, particularly in the case of couplings. Instead of the fins being as shown an integral part of the member 44, they may be attached to it by welding, or if the member is of steel and the fins of weaker metal of high thermal conductivity such as aluminium, they can be attached by the methods illustrated in Figs. 3c and 3d. The fins may be disposed as shown in Fig. 4. It is stated that the fins could be shrunk on to the member 44.