Rotor structure

1. A rotor structure, comprising:

a rotation shaft body in which a blade groove is formed at an outer circumference part rotating around an axis line, and extends in a circumferential direction of the axis line, and a width dimension of a groove opening side of the blade groove is set to be smaller than a width dimension of a groove bottom side of the blade groove; and

a plurality of blade bodies which are arrayed in the circumferential direction at the outer circumference part of the rotation shaft body and have blade basements of which is fitted into the blade groove respectively;

wherein a blade fixing piece is installed so as to be a positioned between at least one set of adjacent two blade bodies in the circumferential direction inside the blade groove,

one of an opening wall part of the groove opening side of the blade groove and the blade fixing piece is provided with a projected part, and the other of them is provided with a recessed part which is fitted into the projected part,

the blade fixing piece is provided with a screw member as the projected part which projects in the radial direction of the axis line at least one side in the width direction of the blade groove, and

the opening wall part of the blade groove is provided with a notch as the recessed part which extends in the radial direction at least one side in the width direction of the blade groove.

2. The rotor structure according to claim 1 ,

wherein the blade fixing piece is allowed to slide in the circumferential direction on the blade groove in a state of fitting of the projected part into the recessed part is cancelled.

3. The rotor structure according to claim 1 ,

wherein the projected part projects in a radial direction of the axis line, and the recessed part extends in the radial direction.

4. The rotor structure according to claim 1 ,

wherein the blade fixing piece includes a piece main body on which the projected part or the recessed part is formed, and a displacement mechanism which causes the piece main body to advance and retract with respect to the groove bottom of the blade groove in the radial direction of the axis line to allow the projected part and to removably fit to the recessed part.

5. The rotor structure according to claim 4 ,

wherein the displacement mechanism comprises:

a through hole which penetrates in the radial direction through the piece main body and has at least partially an internal thread part; and

an advance-retract axle which has at least partially an external thread part screwed into the internal thread part and which can be screwed into the groove bottom of the blade groove.

6. The rotor structure according to claim 1 ,

wherein the blade fixing piece includes a contact part which is in contact with the opening wall part of the blade groove from the groove bottom of the blade groove.

7. The rotor structure according to claim 1 ,

wherein the blade fixing piece is provided with a projection wall as the projected part which projects in the radial direction of the axis line at least one side in the width direction of the blade groove, and

the opening wall part of the blade groove is provided with a notch as the recessed part which extends in the radial direction at least one side in the width direction of the blade groove.

8. The rotor structure according to claim 5 ,

wherein an end face of the advance-retract axle that faces the groove bottom of the blade groove swells out to the groove bottom of the blade groove.