Shaft sealing device and rotary machine

A shaft sealing device comprising:

• a housing which is disposed on an outer side in a radial direction at an interval with respect to a rotor being rotatable around a central axis, extends in a circumferential direction around the central axis, and has an accommodating groove that is recessed to the outer side in the radial direction;
• a sealing body which has a plurality of thin plates laminated in the circumferential direction, in which an outer peripheral end portion on the outer side in the radial direction is accommodated in the accommodating groove, and in which an inner peripheral end portion on an inner side in the radial direction extends from the housing to the inner side in the radial direction to come into slidable contact with an outer peripheral surface of the rotor;
• and
• a convex portion which protrudes in an axial direction in which the central axis extends from any one of the housing and the sealing body toward the other in the accommodating groove,
• wherein the sealing body partitions an annular space between the rotor and the housing into a high-pressure region on a first side in the axial direction and a low-pressure region on a second side in the axial direction,
• the sealing body has a sealing body low-pressure-side side surface facing the second side in the axial direction within the accommodating groove,
• the housing has
• a facing surface which forms a part of the accommodating groove and faces the sealing body low-pressure-side side surface at an interval in the axial direction, and
• a communication portion which allows the low-pressure region and an inside of the accommodating groove to communicate with each other,
• the convex portion is formed on the facing surface or the sealing body low-pressure-side side surface, and partitions a space between the facing surface and the sealing body low-pressure-side side surface into a first space portion on the outer side in the radial direction and a second space portion on the inner side in the radial direction, and
• the communication portion allows the first space portion and the low-pressure region to communicate with each other.