Turbine

Abstract

To provide a turbine that is capable of deforming (tilting) of a support portion (more specifically, a circular-truncated cone portion). A turbine that is provided with a vertically divided casing that is divided into two portions in a longitudinal direction and a support portion that supports a stator-blade ring disposed in the casing, wherein the support portion is provided with a flange portion that is secured between a joining surface of one portion of the casing and a joining surface of the other portion of the casing, being sandwiched therebetween, and a circular-truncated cone portion that connects the flange portion and a stator-blade holding ring, and wherein a thick plate portion having a greater plate thickness than the plate thickness of the flange portion and the stator-blade holding ring is provided between the flange portion located at a lower-half portion and the stator-blade holding ring.

1 . A turbine comprising:
 a vertically divided casing that is divided into two portions in a longitudinal direction; and a support portion that supports a stator-blade holding ring disposed in the casing,   wherein, the support portion is provided with a flange portion that is secured between a joining surface of one portion of the casing and a joining surface of the other portion of the casing, being sandwiched therebetween, and a circular-truncated cone portion that connects the flange portion and the stator-blade holding ring, and   wherein a thick plate portion having a greater plate thickness than the plate thickness of the flange portion and the stator-blade holding ring is provided between the flange portion located at a lower-half portion and the stator-blade holding ring.   
     
     
         2 . A turbine comprising:
 a vertically divided casing that is divided into two portions in a longitudinal direction; and a support portion that supports a stator-blade holding ring disposed in the casing,   wherein, the support portion is provided with a flange portion that is secured between a joining surface of one portion of the casing and a joining surface of the other portion of the casing, being sandwiched therebetween, and a circular-truncated cone portion that connects the flange portion and the stator-blade holding ring, and   wherein the flange portion is formed so that the plate thickness thereof gradually increases from a radially outer side toward a radially inner side thereof, and so that the joining surfaces of the casing coincide with the joining surfaces of the flange portion.   
     
     
         3 . A turbine comprising:
 a vertically divided casing that is divided into two portions in a longitudinal direction; and a support portion that supports a stator-blade holding ring disposed in the casing,   wherein, the support portion is provided with a flange portion that is secured between a joining surface of one portion of the casing and a joining surface of the other portion of the casing, being sandwiched therebetween, and a circular-truncated cone portion that connects the flange portion and the stator-blade holding ring, and   wherein a ring fabricated using a high thermal expansion material as a constituent is provided between an outer circumferential surface of the circular-truncated cone portion and an inner circumferential surface of the front casing.   
     
     
         4 . A turbine comprising:
 a vertically divided casing that is divided into two portions in a longitudinal direction; and a support portion that supports a stator-blade holding ring disposed in the casing,   wherein, the support portion is provided with a flange portion that is secured between a joining surface of one portion of the casing and a joining surface of the other portion of the casing, being sandwiched therebetween, and a circular-truncated cone portion that connects the flange portion and the stator-blade holding ring, and   wherein the circular-truncated cone portion is formed so as to have a fixed length in a circumferential direction.   
     
     
         5 . A turbine according to  claim 1 , wherein the plate thickness at a lower-half portion of the circular-truncated portion is greater than the plate thickness at an upper-half portion of the circular-truncated portion. 
     
     
         6 . A turbine according to  claim 2 , wherein the plate thickness at a lower-half portion of the circular-truncated portion is greater than the plate thickness at an upper-half portion of the circular-truncated portion. 
     
     
         7 . A turbine according to  claim 3 , wherein the plate thickness at a lower-half portion of the circular-truncated portion is greater than the plate thickness at an upper-half portion of the circular-truncated portion. 
     
     
         8 . A turbine according to  claim 4 , wherein the plate thickness at a lower-half portion of the circular-truncated portion is greater than the plate thickness at an upper-half portion of the circular-truncated portion.