Patent Number: 8,500,397

Title: Seals in steam turbine

Abstract: A seal structure for a steam turbine is provided, which is capable of suppressing transfer of heat generated by a friction between a rotating portion and a fixed portion to the rotating portion and of suppressing an increase in the temperature of the rotating portion. A labyrinth seal device serves to suppress the amount of steam leaking from a clearance present between each stator blade (fixed portion) of the steam turbine and a rotor (rotating portion). The seal structure for the steam turbine is formed to ensure that permeable spacers made of a permeable metal are provided on the rotor and a seal stationary body and face respective seal fins provided in the labyrinth seal device.

Inventors: Narita; Kenjiro (Hitachinaka, JP), Yamazaki; Haruyuki (Tokai, JP), Doi; Hiroyuki (Tokai, JP), Kobayashi; Kei (Kitaibaraki, JP), Toriya; Hajime (Hitachi, JP)

Assignee: Hitachi, Ltd.

International Classification: F01D 5/20 (20060101); F04D 29/08 (20060101); F04D 29/18 (20060101); F01D 11/08 (20060101)

Expiration Date: 2021-08-06 0:00:00