| 摘要 |
<p>Gland portion of low pressure steam turbine is improved so that wet steam is prevented from entering the gland portion and vibration caused by mutual contact of rotor and stationary portion due to deformation of the gland portion may be prevented. Gland casing (3) is provided surrounding gland portion periphery (2) of rotor (1). Sealing steam (22) led therein to maintain predetermined pressure flows out of seal portion (4, 5) for sealing the gland portion periphery (2). Steam (20) flows into turbine from central portion to pass through final stage stationary blade (8) and moving blade (9) to rotate the rotor (1) and then to flow out into exhaust chamber (7). Wet steam (21a) as portion thereof flows into cavity (10) through gap (11). The rotor (1) is provided with ridge (15) on and around entire periphery thereof, thereby the wet steam (21a), being prevented from flowing toward the gland portion periphery (2), flows swirling and water in the wet steam (21a) scatters therearound so that the gland casing (3) and the seal portion (4, 5) are prevented from being cooled partially, their contact with the rotor (1) is avoided and vibration caused thereby is prevented. <IMAGE></p> |
