| 摘要 |
PURPOSE:To obtain constant proper cooling of shaft sealing steam by forming a shaft sealing main pipe, into which high temperature high pressure steam is introduced, by means of both a main passage and a vertical passage that extends from its middle part downward together with arranging a water- spraying nozzle in the vicinity of the connecting part between both passages. CONSTITUTION:In a condensing turbine 1, in which shaft sealing of the turbine shaft 2 is performed by high and low pressure part glands 3 and 4 consisting of labyrinth packings, a shaft sealing main pipe 10 is formed by both the main passage 10a and a vertical passage 10b. In the vicinity of the connecting part between both passages 10a and 10b is arranged a water spray nozzle 11, while the bottom part of the vertical passage 10b is connected to a drain passage 14. The main passage 10a is interposed into a shaft sealing passage 16, which connects the gland 3 to the gland 4, and the part of the passage 16, which is located between the high pressure part gland 3 and the main passage 10a, is connected to a condenser 9 via a branch passage 19, in which an exhaust control equipment 20 is interposed. The vertical passage 10b is connected to a steam supply passage 5 via a supply passage 17, in which steam supply control equipment 18 is interposed. |
