GB969599A - Cooling of high-power thermionic valves - Google Patents

Abstract

969,599. Cooling electric discharge tubes. SIEMENS & HALSKE A.G. June 29, 1962 [June 30, 1961], No. 25002/62. Heading H1D. A high-power thermionic valve includes a tubular anode electrode 1, the wall of which bounds at least part of an evacuated enclosure of the valve and has a plurality of axial bores 2 extending therethrough forming passages for cooling liquid capable of evaporation during operation of the valve, wherein to prevent distortion of the anode electrode by mechanical stresses that may arise in the wall as a result of temperature differences occurring between the inner and outer surfaces of the wall and/or between adjacent ones of the cooling bores, a plurality spaced circumferentially, Fig. 1, and/or axially, Fig. 5, extending radial slots 5 are formed in the wall and each open at its outer surface, and wherein any such circumferential slots are continuous whilst any such axial slots extend the axial length of the wall. The slot may open into the bores, the width of the slots with respect to the surface area dimensions of the bores being such that the slots are too narrow to reduce substantially the evaporative cooling effect that would occur in the absence of the slots. Alternatively, the slots may be disposed between each adjacent bore, Fig. 3 (not shown).