Shaft sealing device and rotating machine provided therewith

shaft sealing device that divides an annular space between a rotating shaft and a stator covering an outer circumferential side of the rotating shaft into a low pressure region and a high pressure region in an axial direction in which the rotating shaft extends, the device comprising:

• a housing in which an annular recessed portion is formed to extend in a circumferential direction with respect to the rotating shaft as a center, and which is fixed to the stator;
• a sealing body which is disposed at an outer circumference of the rotating shaft, and a portion of which is accommodated by the annular recessed portion of the housing and is positioned on the radially outside of the rotating shaft;
• and
• a high pressure-side sealing plate that is disposed along the sealing body in the high pressure region inside the annular recessed portion of the housing while a thickness direction of the high pressure-side sealing plate is aligned with the axial direction,
• wherein a non-normal operation flow path is formed in members including the sealing body selected among the sealing body, the housing, and the high pressure-side sealing plate such that a flow which lifts the sealing body from the rotating shaft is formed in the non-normal operation flow path during a process in which a fluid flows from the low pressure region to the high pressure region during a non-normal operation in which pressure in the low pressure region is higher than pressure in the high pressure region.