Title:
A moisture removal device of a steam turbine, and a formation method of a slit hole
Document Type and Number:
Japanese Patent JP6227653
Kind Code:
B2
Abstract:
To improve the removal efficiency of water film flow formed on a pressure surface of a stator blade and to suppress leakage loss of the steam flow by simple processing of the stator blade, a hollow portion 12a is formed inside a stator blade 12, and a slit, extending in a height direction b of the stator blade 12, opens to a surface of the stator bade and is in communication with the hollow portion 12a. The slit 22 is carved on the surface of the stator blade and includes a recess portion 24 being flat and having a long side extending in the height direction b of the stator blade, and at least one through hole 26 which opens to the bottom surface 24a of the recess portion 24 and to the hollow portion 12a. In a projection plane to which a cross section of the slit 22 is projected in the height direction of the stator blade, an area of the inlet opening c of the through hole 26 opening to the bottom surface 24a occupies a part of a projection width of the recess portion 24.
Inventors:
High Ryo Tada
Application Number:
JP2015529413A
Publication Date:
November 08, 2017
Filing Date:
May 12, 2014
Export Citation:
Assignee:
Mitsubishi Hitachi Power Systems Co., Ltd.
International Classes:
F01D9/02; F01D25/32
Domestic Patent References:
| JP63117104A | ||||
| JP499522B1 | ||||
| JP11210404A | ||||
| JP2011117451A | ||||
| JP201425443A | ||||
| JP2007309235A |
Attorney, Agent or Firm:
Seishin ip patent business corporation