Geteilte Duesenplatte fuer Turbinen

1,109,457. Turbine stator blades. WORTHINGTON CORPORATION. Sept. 7, 1965 [Nov.17, 1964], No.38115/65. Heading F1T. In a diaphragm assembly for turbines, a number of nozzle blade segments 30, Fig.1, each comprising at least one blade are attached to an outer segmented ring 14, 16 and located by an inner segmented ring 18, 20 for relative movement therewith for expansion purposes. Preferably, the rings 14, 16 and 18, 20 are forged , and the segments 30 are cast from stainless steel. Radial projections 38, Fig. 2, of the segments 30 are clamped in a circumferential groove 40 in ring 14, 16 by a segmented member 44 containing a seal 48 for the rotor blade tips. Axially extending pins (49), Fig. 3 (not shown), in bores through the junction between the outer surfaces of the projections 38 and the bottom of the groove 40 prevent circumferential movement of the segments 30. Expansion clearances 57 are provided. The ring 18, 20 comprising two segments located together by pins 60, 62, has a peripheral projection 64 extending into channels 66 in the segments 30 with expansion-permitting clearances 68. Moreover, the ring 18, 20 has guide keys 72 which engage grooves in the segments 30 with radial clearances 76. Circumferential clearances 33 are provided between the inner parts 32 of segments 30. The ring 18, 20 carries a labyrinth seal 59 for the rotor. The diaphragm assembly is positioned within the turbine casing by a locating surface 52, and by pins 80 which are located in holes 78 with radial clearances 82.