GB865544A - Turbines - Google Patents

Abstract

865,544. Turbine stator blade assemblies. NAPIER & SON Ltd., D. April 8, 1959 [April 14, 1958], No. 11873/58. Class 110 (3). A turbine stator assembly comprises inner and outer support rings and a series of hollow stator blades mounted between the two rings, the inner and outer support rings being each formed with a series of circumferentially spaced slots through which the respective ends of the blades project, tangentially extending apertures being formed in the projecting ends of the blades and locking- wires being threaded through the apertures. Means are also provided for delivering cooling air to an annular cooling chamber surrounding the outer support ring, the cooling air then passing radially inwardly through the hollow blades and issuing into an annular space formed within the inner support ring. The invention is shown applied to gas turbine inlet nozzle structure which comprises a series of hollow sheet-metal guide-blades 14 mounted between outer and inner rings 11, 12, the outer ring 11 being of substantially channel section and the inner ring 12 of T-section. The outer ends 18 of the blades 14 project through openings in the base of the ring 11 and a locking wire 20 is threaded through holes in the projecting ends. Similarly, the inner ends 19 project through openings in the flange of the inner ring 12 and a locking wire 21 is threaded through holes in the projecting ends. A cover-plate 32 is secured to the outer support ring 11 so as to form a cooling air manifold 31 to which air is supplied through duct 30 and from which it passes through the hollow guide blades 14 to discharge radially inwardly of the inner support ring 12. The plate 32 lies over the flange 33 of the outer support ring and under the flange 35, the flange 35 being formed with spaced projections 36 to which the plate 32 is secured by welding, the portions 37 between the projections not being welded. The flange 33 is formed with notches 34 which form openings for the inflow of cooling air from the duct 30. The parts 37 between the welded joints are sealed by applying thereto a coating of stainless steel applied in molten form from a hot metal spray gun. The coating would also in practice be applied over the welded joints at the projections 36. The parts of the blades which project through the slots in the outer and inner support rings are also sealed to the support rings by a sprayed metal coating. Specification 865,545 is referred to.