GB197873A - Improvements relating to elastic fluid turbines - Google Patents

Abstract

197,873. Metropolitan - Vickers Electrical Co., Ltd., (Westinghouse Electric & Manufacturing Co.). July 18, 1922. Blades. -The wide low-pressure reaction blading described in Specifications 182,775 and 183,429 which receives elastic fluid axially and discharges it peripherally, or peripherally and laterally at a small angle, is formed with curved ribs or other deflector surfaces which extend from blade to blade. When the wide blading comprises a series of sections suitably assembled the deflectors are secured to the sections before being assembled. In Fig. 6, deflector plates 30, made as single pieces or in sections are shaped to fit grooved supports 31 on the blade sections 28. The plates 30 may be bowed so that when forced into the supports 31 they will brace the blades and permit of differential expansion. Fig. 2 shows a single guide member 32 for each blade section 22, the members 32 being arranged successively lower from the inlet edge of the first blade section to the rear edge of the last section. To reduce vibration, the wide blades 22, Fig. 12, are secured to reinforcing members 35 which consist of flat annular strips fitting slots in the blade tips and arranged radially of the blades. Fig. 14 shows a method of connecting the blades 22 to the rotor 18. The 'blade 22 has a dovetail root 26 fitting a slot in the rotor. A groove 37 at the base of the slot receives wedges 38, 39 which force together the inclined surfaces of the blade root and of the slot. An end plate 42 contacts with the last wedge 38 of each series and holds the wedges in position.