Kabushiki Kaisha Toshiba

Yoshiki Niizeki

Hisashi Matsuda

Naoki Shibukawa

Tsutomu Ooishi

Fumio Ootomo

Hiroshi Kawakami

Masashi Takahashi

Osamu Shindo

Yasunori Iwai

Asako Inomata

Akio Sayano

Yoshitaka Fukuyama

Hiroyuki Kawagishi

Norihisa Saito

Taro Kawabata

A nozzle boxincludes: a lead-in pipe; a bent pipeconnected to the lead-in pipeand formed so as to change a direction of a channel center lineto an axial direction of a turbine rotor; and an annular pipeconnected to the bent pipeand leading steam to a first-stage nozzlewhile spreading the steam in a circumferential direction of the turbine rotor. In the steam channel lead-in part structure, from an inlet of the lead-in pipetoward an outlet of the annular pipe, steam channel widths Sa-to Sn-in a first direction intersecting with the channel center linegradually increases and steam channel widths Sa-to Sn-in a second direction intersecting with the channel center lineand perpendicular to the first direction gradually decreases.

Nozzle box of axial flow turbine and axial flow turbine

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.

Steam turbine and hydrophilic coating material used therefor

A row of moving blades for a steam turbine has moving blades elongated radially which are arranged peripherally around and secured to a turbine rotor. The row also has an intermediate support structure for holding the blades to each other at a radially intermediate position. The support structure has a shape of a streamline cross section. The support structure may include a tie wire secured to the blades, or lugs protruding from the blades and combined to each other. The support structure may include lugs protruding from the blades to each other, and a sleeve combining the lugs. The shape of a streamline cross section may have an obtuse-angle or acute-angle upstream part.

Steam turbine, and intermediate support structure for holding row of long moving blades therein

A steam valve in accordance with the present invention is the steam valve that houses a first valve devicecomposed of a valve seat, a valve body, a valve rod, and a driving device, and a second valve devicecomposed of the valve seat, the valve body, the valve rod, and the driving device, combined with each other in the valve casing, and a closing portionto block a part of a main steam flow flowing from outside to inside of a strainer is formed in the strainerthat is housed in the valve casingand that surrounds the valve bodyof the first valve device. According to the above described configuration, the steam valve that is aimed to further decrease a pressure loss can be provided by effectively controlling the steam flow in the strainer housed in the valve casing.

Steam valve

Growing community of inventors

Tokyo, Japan

Yoshiki Niizeki