Rotary machine and seal member

1. A rotary machine comprising:

a casing having a hollow shape;

a rotor that is rotatably supported in the casing;

a stator blade fixed to an inner peripheral portion of the casing;

a rotor blade that is shifted with respect to the stator blade in an axial direction of the rotor to be fixed to an outer peripheral portion of the rotor; and

a seal device disposed between the inner peripheral portion of the casing and a tip portion of the rotor blade,

wherein an attachment recessed portion is provided in the inner peripheral portion of the casing, and a caulking recessed portion is provided adjacent to the attachment recessed portion,

a base end portion of the stator blade is mounted in the attachment recessed portion, and a caulking member is locked to the caulking recessed portion and the base end portion of the stator blade, so that the stator blade is fixed to the inner peripheral portion of the casing, and

the seal device includes a seal member mounted in the inner peripheral portion of the casing, and the seal member covers at least a part of the caulking recessed portion.

2. The rotary machine according to claim 1 ,

wherein the caulking recessed portion is provided upstream of the attachment recessed portion in a flow direction of a fluid, and an end portion of the seal member, the end portion being located on a downstream side in the flow direction of the fluid, covers the caulking recessed portion.

3. The rotary machine according to claim 1 ,

wherein a predetermined gap is provided between an end portion of the seal member, the end portion being located in a flow direction of a fluid, and the stator blade.

4. The rotary machine according to claim 3 ,

wherein a flat surface along the axial direction of the rotor is provided by the seal member between a plurality of stages of the stator blades.

5. The rotary machine according to claim 4 ,

wherein the flat surface of the seal member is continuous with an inner peripheral surface of the casing without a step between the flat surface and the inner peripheral surface.

6. A seal member that is disposed between an inner peripheral portion of a casing and a tip portion of a rotor blade, the member comprising:

an attachment portion mounted in the inner peripheral portion of the casing;

a seal portion provided inside the attachment portion in a radial direction; and

a plurality of fins that are provided at predetermined intervals in a flow direction of a fluid so as to protrude inward from the seal portion in the radial direction,

wherein when a distance between an upstreammost fin and a downstreammost fin of the plurality of fins is D 1 , and a distance between the downstreammost fin and a downstream end of the seal portion is D 2 ,

D 1 and D 2 are set to satisfy D 1 ×0.5<D 2 .

7. The seal member according to claim 6 ,

wherein when a distance between an upstream end of the seal portion and the upstreammost fin is D 3 ,

D 3 is set to satisfy D 3 <D 2 .

8. The seal member according to claim 6 ,

wherein the seal portion includes a protrusion portion that extends further downstream than a downstream end of the rotor blade in an assembly state where the seal portion is assembled to the inner peripheral portion of the casing.

9. The seal member according to claim 8 ,

wherein a cavity is provided outside the protrusion portion in the radial direction in the assembly state.

10. The seal member according to claim 8 ,

wherein the plurality of fins are provided only upstream of the protrusion portion in the seal portion.