Kabushiki Kaisha Toshiba

Yoriharu Murata

Kenichi Imai

Masayuki Yamada

Toshio Suzuki

Yoshifumi Iwasaki

Daisuke Nomura

Akihiro Onoda

Toshio Hirano

Kenichi Okuno

Itaru Murakami

Naoki Shibukawa

Shinichiro Ohashi

Reki Takaku

Osamu Furuya

Tomohiro Tejima

Haruki Ohnishi

Manabu Komiyama

According to an embodiment, a rotor blade cover section is integrated with the rotor blades at leading ends thereof. A plurality of sealing fins is disposed at the rotor blade cover section, the sealing fins forming a predetermined clearance relative to an inner peripheral portion of the nozzle outer ring. An annular solid particle trapping space is disposed at the inner peripheral portion of the nozzle outer ring, the solid particle trapping space communicating with an inlet of a steam leak and trapping solid particles that flow in with steam. In the sealing structure, the nozzle outer ring has a through hole through which the solid particles are to be discharged from the solid particle trapping space toward a downstream stage of the steam turbine.

Sealing structure in steam turbine

A precipitation hardening type martensitic stainless steel of an embodiment contains: Cr: 8.5 to 12.5%; Mo: 1 to 2%; Ni: 8.5 to 11.5%; Ti: 0.6 to 1.4%; C: 0.0005 to 0.05%; Al: 0.0005 to 0.25%; Cu: 0.005 to 0.75%; Nb: 0.0005 to 0.3%; Si: 0.005 to 0.75%; Mn: 0.005 to 1%; and N: 0.0001 to 0.03% by mass, and the balance of Fe and unavoidable impurities.

Precipitation hardening type martensitic stainless steel, rotor blade of steam turbine and steam turbine

A turbine rotor assemblycomprises a turbine rotor and a plurality of moving bladesimplanted in a circumferential direction of the rotor. A flow passage is formed between each of the moving bladesand a circumferentially adjacent moving blade. Each of the moving bladescomprises a suction side connecting memberprotruded on a blade suction surfaceand a pressure side connecting memberprotruded on a blade pressure surface, wherein the suction side connecting memberof each of the moving bladesis configured to be connected with the pressure side connecting memberof the circumferentially adjacent moving bladeto form an intermediate connecting memberbetween the moving bladeand the circumferentially adjacent moving bladeduring a rotation of the turbine rotor. A downstream side end edgeof the intermediate connecting memberis positioned at an upstream side of a throat S of the flow passage.

Turbine rotor assembly and steam turbine

A movable blade of a turbine, which has a plurality of stages each provided with movable and stationary blades mounted to a turbine rotor, comprises a movable blade body having a leading edge portion, with respect to a turbine steam flow, and an erosion protective piece which is formed to be continuously integrally with the leading edge portion of the movable blade body so as to be protruded therefrom. The leading edge portion and the erosion protective piece are subjected to a surface hardening treatment such as flame hardening treatment.

Turbine movable blade

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Yokohama, Japan

Yoriharu Murata