Patent ID: 9631514
Date: 2017-04-25
CPC Classifications: F01D,F02C,F05D,Y02E

Claim:
1. An axial-flow turbine comprising: a plurality of nozzle structures supported by a casing; and a plurality of blade structures supported by a turbine rotor which is rotatable against the casing, the nozzle structure and the blade structure alternately arranged in an axial direction of the turbine rotor, wherein at least one nozzle structure among the plurality of nozzle structures includes: an outer ring diaphragm supported by the casing; an inner ring diaphragm provided in an inner circumferential side of the outer ring diaphragm, the outer ring diaphragm and the inner ring diaphragm forming an annular opening portion which extends in a circumferential direction therebetween, a nozzle provided in a portion of a region of the annular opening portion in the circumferential direction, a closing part provided in another portion of the region of the annular opening portion in the circumferential direction, the closing part closing said other portion of the region to prevent a working fluid from flowing into said other portion of the region, and a closing part medium passage provided in the closing part, the closing part medium passage being configured to flow a cooling medium which cools the closing part.