Improvements in gas turbines

Abstract

Abstract 516,781. Elastic - fluid turbines. TALALMANYKIFEJLESZTO ES ERTEKESITO K.F.T. July 7, 1938, No. 20127. Convention date, July 7, 1937. [Class 110 (iii)] A gas turbine of the kind in which the mean diameter of a stationary or rotating blade ring is approximately equal to the average of the mean diameters of the blade rings adjacent to it. and in which there are no intervening walls between the blades of successive rings, has continuous boundary walls for the gas stream, which are spaced away from the supporting rotor or stator by means of webs or stays, formed by collars or flanges extending from the blade rings .which abut either against the collars or flanges of adjacent blade rings or against intermediate spacing rings. In the turbine shown, Fig. 1, the boundary walls are formed by the collars or flanges of the blades 7, 11 and the spacing rings 8, 12. The webs or stays 27, 29 are made of as small a cross-section and as long as possible to limit the amount of heat conducted to the rotor or stator. The webs 29 of the spacing rings are made to fit closely in a peripheral direction so as to limit the leakage of working fluid between stages. The rotor is cooled by gas or liquid supplied through the duct 15 and in order to separate the cooling from the working medium the joint between the flanges 30 of the rotor discs 5 is made gas tight. The stator may be provided with cooling passages 23. The cooling medium may be the compressed air which.is afterwards used in the turbine. In a modification, in which the rotor is of the drum type, the spacing rings are omitted, and the blades are attached to the drum by a dovetail joint. The webs or stays 27, 29 are preferably made of austenitic steel or any other material with a low co-efficient of heat conduction.

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