Patent ID: 9677669
Date: 2017-06-13
CPC Classifications: F01D,F05D,F16J

Claim:
1. A shaft seal device that partitions a space between a rotor and a stator into a high-pressure side and a low-pressure side, the shaft seal device comprising: a seal body that includes a plurality of thin-plate seal pieces extending toward the rotor from the stator and laminated in a circumferential direction of the rotor; and a housing that is fixed to the stator and holds the seal body so as to surround the seal body from the outside in a radial direction, and includes a first facing surface facing a high-pressure-side edge of the seal body and a second facing surface facing a low-pressure-side edge of the seal body, wherein the housing has a stepped portion at a tip side of a low-pressure-side side wall of the housing and at a radially inner end portion of the low-pressure-side side wall, the stepped portion being spaced apart from the seal body in a direction of an axis of the rotor, a high-pressure-side clearance between the seal body and the first facing surface is set to be smaller than a low-pressure-side clearance between the seal body and the second facing surface, a slope part, which gradually slopes to the high-pressure side toward a tip close to the rotor, is formed at the low-pressure-side edge of each thin-plate seal piece of the seal body, and the tip side of the stepped portion slopes along the slope part of a thin-plate seal piece, and is formed so that a gap between the stepped portion and the slope part of the thin-plate seal piece is constant.