Steam turbine jointed stationary blade

摘要

Two stage jointed stationary blade of high pressure or intermediate pressure steam turbine is made by bolt joint in place of weld joint so as to make detachment and disassembling possible thereby to facilitate maintenance and inspection work and to reduce assembling man-hour. Stationary blade (front stage)(2), outer ring front portion (1) and inner ring front portion (3) are welded into integral structure. Stationary blade (rear stage) 22, outer ring rear portion (21) and inner ring rear portion (23) are welded into integral structure. The outer ring front portion 1, outer ring center portion 10 and the outer ring rear portion 21 are mutually engaged via engaging portions (4, 11) and (12, 24) with precise positioning and then jointed together integrally by bolt (30). Two stage jointed stationary blade so made is engaged with moving blades (33, 35), labyrinth seals (32, 34) are fitted to seal fitting portions (6, 26) and seal fins (31, 34) are fitted in seal fin grooves (13, 27). <IMAGE>