Claims
- 1. A steam turbine comprising:a turbine casing; a turbine rotor accommodated in the turbine casing so as to extend along a direction of flow of steam; and a plurality of turbine pressure sections to be mounted to the turbine rotor including, in combination, at least two or more of a turbine high pressure portion, a turbine intermediate pressure portion and a turbine low pressure portion, said two or more turbine pressure portions being provided with pressure stages each including a turbine nozzle and a movable blade in combination, wherein a partial arc admission is formed to each of said pressure stages on an upstream side of a steam flow in the turbine casing.
- 2. A steam turbine according to claim 1, wherein when coordinate axes are placed on a center of said turbine rotor and said turbine rotor is divided into first, second third and fourth quadrants in the counterclockwise direction, said partial arc admission is formed in an angular region connecting said first and fourth quadrants.
- 3. A steam turbine according to claim 1, wherein a height of each of said turbine nozzle and said movable blade in said pressure stage in which the partial arc admission is formed is set to 25 mm or more.
- 4. A steam turbine comprising:a turbine casing; a turbine rotor accommodated in the turbine casing so as to extend along a direction of flow of steam; a plurality of turbine pressure sections to be mounted to the turbine rotor including, in combination, at least two or more of a turbine high pressure portion, a turbine intermediate pressure portion, and a turbine low pressure portion, the two or more turbine pressure portions being provided with pressure stages each including a turbine nozzle and a movable blade; and wherein a partial arc admission is formed within each of the pressure stages on an upstream side of a steam flow in the turbine casing such that when coordinate axes are placed on a center of the turbine rotor and the turbine rotor is divided into first, second, third, and fourth quadrants relative to a counterclockwise direction, the partial arc admission is formed in an angular region connecting the first and fourth quadrants.
Priority Claims (1)
Number |
Date |
Country |
Kind |
10-111166 |
Apr 1998 |
JP |
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Parent Case Info
This application is a division of Ser. No. 09/294,897 filled Apr. 20, 1999.
US Referenced Citations (13)
Foreign Referenced Citations (2)
Number |
Date |
Country |
3-130502 |
Jun 1991 |
JP |
5-159009 |
Jun 1994 |
JP |
Non-Patent Literature Citations (1)
Entry |
Technical Report of “Development and Design Features of Single Cylinder Reheat Turbine Plant”, vol. 17, No. 2, published Mar. 1980 from Mitsubishi Juko Kabushiki Kaisha, by T. Fujita et al. |