GB893579A - Improvements relating to stator units for use in rotary power plants utilizing compressors or turbines - Google Patents

Abstract

893,579. Turbine or compressor stator blade mountings. UNITED AIRCRAFT CORPORATION. Aug. 21, 1958 [Aug. 22, 1957], No. 26924/58. Class 110 (3). In a stator unit for rotary power plants including a compressor or turbine in which each of a number of equally-spaced radially-extending vanes may be removed independently from one side only of the unit, the vanes are each provided at their outer ends with an axiallyextending platform and at their inner ends with two radially-extending flanges of different heights. The vanes are supported at their outer ends by an outer support-ring having radially-directed pins or lugs, one of which projects loosely through the platform of each vane, and are supported at their inner ends by an inner support comprising two radially-extending circular flanges of different outer diameter, of which the flange of smaller outer diameter is connected to axially-extending lugs one of which projects through one of the flanges on each vane. In Fig. 1, the stator unit 18 comprises a plurality of stator vanes 20 which are individually supported at their inner end by inner supports 22 and at their outer end by outer support 24. The outer support 24 comprises an annular axially-directed ring 26 which is supported by a one-piece outer turbine casing 28, and has a plurality of radial holes 36 spaced equally circumferentially to receive outer vane supportpins 38, which loosely engage the outer vane platform 54. The ring 26 further comprises a flange 40 against which an anti-erosion and thrust strip 42 bears, the strip being cooled by air passing through a bore 48. The inner support 22 comprises a conical casing 60 from which annular flanges 62, 64 project. The flange 62 has a plurality of holes 70 which each receive an inner vane support-pin 72. The inner end 74 of vane 20 comprises flanges 78, 80 joined by a member 82 and in the assembled position (Fig. 1) these flanges abut flanges 62, 64 respectively, each pin 72 passing through a corresponding hole in the flange 78 which is retained by locking-wires 92. The plain pins 72 may be replaced by threaded bolts. To assemble a vane 20, the inner vane end 74 is tilted axially forward or upstream of the outer vane end 76 such that connection may be made between the pin 38 and the platform 54, whereupon the vane 20 may be pivoted about pin 38 into position as shown in Fig. 1 and held therein by the pins 72 and the locking-wires 92.