First Stage Stationary Blade Segment, Stationary Unit, First Stage Stationary Blade Segment Unit, And Steam Turbine

Abstract: This first-stage stationary blade segment comprises an outer ring extending in a circumferential direction, and a plurality of first-stage stationary blades attached on the radially inner side of the outer ring so as to be aligned in the circumferential direction. The first-stage stationary blades each have a blade body extending in the radial direction, and an outer shroud formed on the radially outer side of the blade body with respect to the axis. The outer shroud has a shroud main body, and an embedded part connected to the radially outer side of the shroud main body. The embedded part has an embedded front end surface facing the side upstream along the axis, and an embedded rear end surface facing the side downstream along the axis. The outer ring has outer ring grooves into which the outer shrouds of each of the plurality of first-stage stationary blades is inserted. The embedded front end surface is positioned upstream along the axis from the front edge of the blade body. The embedded rear end surface is positioned upstream along the axis from the rear edge of the blade body.

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