SHAFT SEAL DEVICE

PROBLEM TO BE SOLVED: To provide a shaft seal device capable of avoiding contact of a rotation shaft with a labyrinth seal and avoiding labyrinth vibrations and injure of labyrinth seal.SOLUTION: A shaft seal device includes: a rotation shaft of a rotary machine; a stationary blade guide which is annularly arranged on the outer side of rotation shaft and separates a region along the rotation shaft into a high pressure region and a low pressure region; and a seal segment which is supported by the stationary blade guide so as to be moved in a rotation shaft direction in accordance with a differential pressure between the high pressure region and the low pressure region and is annularly arranged around the rotation shaft. Therein, the seal segment approaches the rotation shaft and narrows an interval with the rotation shaft when the differential pressure between the high pressure region and the low pressure region is large, and is separated from the rotation shaft and widens a gap with the rotation shaft when the differential pressure between the high pressure region and the low pressure region is small.SELECTED DRAWING: Figure 1 【課題】回転軸とラビリンスシールとの接触を回避し、ラビンリス振動やラビリンスシールの損傷を回避することができる軸シール装置を提供する。【解決手段】本実施形態に係る軸シール装置は、回転機械の回転軸と、前記回転軸の外側に環状に配置され、前記回転軸に沿った領域を高圧領域と低圧領域に隔てる静翼ガイドと、前記高圧領域と前記低圧領域との差圧によって回転軸方向に移動するように前記静翼ガイドに支持されると共に、前記回転軸周りに環状に配置されるシールセグメントと、を備え、前記シールセグメントは、前記高圧領域と前記低圧領域との差圧が大きいときは、前記回転軸に接近して前記回転軸との間隙を狭め、前記高圧領域と前記低圧領域との差圧が小さいときは、前記回転軸から離隔して前記回転軸との間隙を広げる。【選択図】 図１