Shaft sealing device and rotating machine comprising same

摘要

A shaft sealing device is provided in an annular space between a rotor and a stator surrounding an outer periphery of the rotor, and divides the annular space in the direction of an axis of the rotor into a high-pressure region and a low-pressure region. The shaft sealing device includes a seal body obtained by stacking a plurality of thin plate sealing pieces in a circumferential direction of the rotor; and a high-pressure side plate that extends from the stator toward the radial inner side so as to run along the high-pressure side of the seal body, and is segmented into a plurality of portions in the circumferential direction, and includes a rigidity imparting member configured to impart rigidity in the direction of the axis to a portion of the surface of the high-pressure side plate that faces the high-pressure region.

主权项

1. A shaft sealing device provided in an annular space between a rotor and a stator surrounding an outer periphery of the rotor to divide the annular space into a high-pressure region and a low-pressure region in a direction of an axis of the rotor, the shaft sealing device comprising:
a seal body having a plurality of thin plate sealing pieces that extend from the stator toward a radial inner side of the rotor and are stacked in a circumferential direction of the rotor; a high-pressure side plate that extends from the stator toward a radial inner side so as to run along a high-pressure side of the seal body, and is segmented into a plurality of portions in the circumferential direction; and a rigidity imparting member configured to impart rigidity in the direction of the axis of the rotor to a portion of a surface of the high-pressure side plate that faces the high-pressure region, wherein the rigidity imparting member is a supporting plate portion comprising a first plate piece and a second plate piece, wherein the first plate piece is stacked on the surface of the high-pressure side plate that faces the high-pressure region, and extends from the stator toward the radial inner side, wherein a longitudinal length of the first plate piece is shorter than the high-pressure side plate, and wherein the second plate piece is stacked on the surface of the first plate piece that faces the high-pressure region, and extends from the stator toward the radial inner side, wherein a longitudinal length of the second plate piece is shorter than the first plate piece.