Axial turbine
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first embodiment
[0024]FIGS. 1 and 2 each show a stage structure of a steam turbine according to a first embodiment of the invention. A turbine-stage of the steam turbine according to the present embodiment is provided with a rotatably supported rotor 3, a bucket 5 fixed to the rotor 3, a shroud 6 provided at the tip of the bucket 5, a diaphragm outer ring 1 opposed to the shroud 6 with a gap provided therebetween, a radial seal fin 7 provided in such a way as to protrude from the diaphragm outer ring 1 in the radial direction of the rotor 3 in a gap between the shroud 6 and the diaphragm outer ring 1, an axial seal fin 8 provided in such away as to protrude from the diaphragm outer ring 1 in the direction of a rotation axis of the rotor 3 in a gap between the shroud 6 and the diaphragm outer ring 1, a plurality of ribs 9 provided in such a way as to be sandwiched between the diaphragm outer ring 1 and the axial seal fin 8 and to be extended from the diaphragm outer ring 1 towards the shroud 6 in th...
second embodiment
[0042]FIGS. 10, and 11 each show a stage structure of a steam turbine according to a second embodiment of the invention. Further, FIG. 12 is a plan view of a guide plate 10 shown in FIG. 11. A turbine stage of the steam turbine according to the present embodiment is provided with a rotatably supported rotor 3, a bucket 5 fixed to the rotor 3, a shroud 6 provided at the tip of the bucket 5, a diaphragm outer ring 1 opposed to the shroud 6 with a gap provided therebetween, a radial seal fin 7 provided in such a way as to protrude from the diaphragm outer ring 1 in the radial direction of the rotor 3 in a gap between the shroud 6 and the diaphragm outer ring 1, an axial seal fin 8 provided in such a way as to protrude from the diaphragm outer ring 1 in the direction of the rotation axis of the rotor 3 in the gap between the shroud 6 and the diaphragm outer ring 1, a plurality of ribs 9 provided in such a way as to be sandwiched between the diaphragm outer ring 1 and the axial seal fin ...
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