Kabushiki Kaisha Toshiba

Toshiba Energy Systems & Solutions Corporation

Hideyuki Kawajiri

Koichi Kubo

Yoshihiro Ishikawa

Hajime Koyama

Toshifumi Kurokawa

Naritoshi Nakagawa

Norio Ohtake

Nobuaki Noda

Madoka Narikawa

Yukito Yada

In a guide vane according to an embodiment of the invention, where in a section perpendicular to a guide vane rotation axis, a curvature of a contour line forming a runner side vane surface of the guide vane is referred to as a positive curvature when the contour line is formed to be convex, while the curvature of the contour line is referred to as a negative curvature when the contour line is formed to be concave, a negative curvature portion where the curvature of the contour line becomes negative is provided on the runner side vane surface. The negative curvature portion is formed from an upper end portion to a lower end portion of the runner side vane surface.

Guide vane and fluid machine

A vane body of a guide vane includes a leading edge, and a trailing edge which is located closer to a runner than the leading edge, when located radially outside the runner. A projection extending in a direction from the trailing edge toward the leading edge is provided on an internal-diameter side blade face of the vane body, at least in any one of one side area of the internal-diameter side blade face and the other side area thereof in an axial direction of a guide vane rotation shaft, the internal-diameter side blade face being disposed on a side of the runner. The projection has a projection rear end of an arcuate shape, which projection rear end is formed to extend along a rotation trajectory which is drawn by the trailing edge when the vane body is rotated about the guide vane rotation shaft.

Guide vane of hydraulic machinery and hydraulic machine

A fluid machine of an embodiment includes a sealing portion formed of an annular minute gap between a runner band of a runner configuring a rotating portion and a sealing liner which is a stationary portion and arranged in opposition to the runner band. A groove having a quadrangular cross-sectional shape is formed circumferentially on a surface of the sealing liner configuring the sealing portion. In a cross section perpendicular to a groove forming direction of the groove, an angle &#x3b8;, formed between a side WU of the groove on the most upstream side with respect to the flowing direction of the leakage flow and a side Wof the groove which is on an extended line of the surface of the sealing liner, is determined to be 15&#xb0; or more and 40&#xb0; or less.

Fluid machine

Growing community of inventors

Yokohama, Japan

Hideyuki Kawajiri