GB514651A - Improvements in air-cooled thermionic valves - Google Patents

Abstract

514,651. Thermionic valves. M-0 VALVE CO., Ltd., BOYLAND, D. A., and LE ROSSIGNOL, R. May 12, 1938, No. 14188. [Class 39 (i)] A thermionic valve of the type in which the anode forms a a part of the envelope and is adapted to be cooled by a forced air stream has as integral parts a plurality of apertures (A) suited to multiple connection and sup. plying air to one or more apertures (B) the passages connect ing the two sets of apertures being such that the strean entering each aperture (A) cools a part only of the anode and that all these streams together cool the whole anode but are not geometrically parallel streams. In the form shown in Fig. 2, the anode 1 has annular fins 2 and is cooled by air entering channels 3 from nozzles 4, which are the abovenamed apertures (A), and passing to spaces between the fins 2 and the sides of the channels as shown by the dotted arrows. These spaces correspond to the apertures (B). In another form, Fig. 1 (not shown), the annular fins on the anode are replaced by linear longitudinal fins surrounded at intervals along the valve axis by annular channels open on the inside to all the inter-fin spaces and each receiving air from a nozzle corresponding to an aperture (A). In either form, each channel may be replaced by a set of nozzles (A) in multiple directing air into the space (B) between a pair of adjacent fins. In place of being introduced under pressure, the air may be drawn out of the nozzles by suction. Specification 473,797 is referred to.