Steam turbine and hydrophilic coating material used therefor
AssigneeKabushiki Kaisha Toshiba
InventorsYoshiki Niizeki, Akio Sayano, Naoki Shibukawa, Norihisa Saito, Masashi Takahashi
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Abstract
A steam turbine includes a bucket implanted in a turbine rotor and a nozzle disposed on an upstream side of the bucket and supported by a turbine casing, in which a plurality of stages, each including the bucket and the nozzle, are arranged axially in the turbine so as to define a steam path. A hydrophilic coating portion is disposed in the entire area or an area of at least one portion of a circumferential surface of the turbine rotor, surfaces of the nozzles, surfaces of the buckets, and an inner circumferential surface of the turbine casing.
Claims20
A steam turbine comprising:
- a turbine casing;
- a turbine rotor disposed in the turbine casing;
- a bucket implanted in the turbine rotor;
- and
- a nozzle disposed on an upstream side of the bucket and supported by the turbine casing, in which a plurality of stages, each including the bucket and the nozzle, are arranged axially in the turbine so as to define a steam path;
- wherein a hydrophilic coating portion is disposed in a limited area of a radial outer portion of a concave surface of the nozzle along a trailing edge thereof.
A steam turbine comprising:
- a turbine casing;
- a turbine rotor disposed in the turbine casing;
- a bucket implanted in the turbine rotor;
- and
- a nozzle disposed on an upstream side of the bucket and supported by the turbine casing, in which a plurality of stages, each including the bucket and the nozzle, are arranged axially in the turbine so as to define a steam path;
- wherein the nozzle is provided with a slit which communicates with an inside thereof,
- wherein a hydrophilic coating portion is disposed in a limited area of a radial outer portion of a concave surface of the nozzle along a trailing edge thereof.
Dependencies are inferred from the claim text.