Shaft seal mechanism and turbine

摘要

The present invention reduces the amount of gas which leaks and flows from a high pressure side to a low pressure side of the axis and maintains good sealing performance even at high differential pressures. The invention discloses an axis sealing mechanism (25) comprising casings (26) which are supported inside of the stable portion, a plurality of planar plates (28), which are mutually spaced around the axis, each of which is fixed to the casings (26), positioned so that an inner end of each planar plate (28) makes an acute angle with a peripheral surface (23a) of the axis (23) and contacts the peripheral surface (23a) of the axis (23) over a predetermined length in an axial direction, a high pressure side plate (29) which is arranged at a high pressure side and a low pressure side plate (30) which is arranged at a low pressure side so as to hold the planar plates (28) therebetween and a flexible plate (31) which is arranged between the planar plates (28) and the high pressure side plate (29), and is flexible in an axial direction. The invention also discloses a turbine which provides the above sealing mechanism. <IMAGE>