Turbine and method for manufacturing turbine

1. A turbine comprising:

a shaft body supported rotatably;

a plurality of turbine blade members that is provided on an outer periphery of the shaft body and constitutes a turbine blade row in a circumferential direction of the shaft body;

a casing covering the shaft body and the turbine blade row;

an outer ring that is provided on an inner periphery of the casing and includes an inner peripheral portion in which a cross-section having an uneven shape is continuous in a circumferential direction;

a plurality of turbine vane members that each has a shroud fitted into the inner peripheral portion of the outer ring and a turbine vane main body extending from the shroud to a radially inward side and that is provided in the circumferential direction and constitutes a turbine vane row in which the shrouds adjacent to each other are aligned in the circumferential direction; and

a plate member that connects at least some of the plurality of turbine vane members and covers one side of the shrouds in an axial direction, thereby sealing a shroud gap formed between the shrouds adjacent to each other in the circumferential direction,

wherein the inner peripheral portion of the outer ring is formed as a groove extending in the circumferential direction, and

the plate member seals at least a portion of each of the shrouds that protrude from the inner peripheral portion of the outer ring to the radially inward side of the shroud gap.

2. The turbine according to claim 1 , wherein a plurality of plate members is provided continuously in the circumferential direction.

3. The turbine according to claim 1 , wherein the plate member is provided over the circumference of the entirety of the plurality of shrouds.

4. The turbine according to claim 1 , wherein the plate member seals the entire shroud gap.

5. The turbine according to claim 2 , wherein the plate member is provided over the circumference of the entirety of the plurality of shrouds.

6. The turbine according to claim 2 , wherein the plate member seals the entire shroud gap.

7. A method for manufacturing a turbine that includes

a shaft body supported rotatably;

a plurality of turbine blade members that is provided on an outer periphery of the shaft body and constitutes a turbine blade row in a circumferential direction of the shaft body;

a casing covering the shaft body and the turbine blade row;

an outer ring that is provided on an inner periphery of the casing and includes an inner peripheral portion in which a cross-section having an uneven shape is continuous in a circumferential direction; and

a plurality of turbine vane members that each has a shroud fitted into the inner peripheral portion of the outer ring and a turbine vane main body extending from the shroud to a radially inward side and that is provided in the circumferential direction and constitutes a turbine vane row in which the shrouds adjacent to each other are aligned in the circumferential direction,

the method comprising:

a preparing process of preparing a plurality of turbine vane members, a plate member, and a plurality of outer ring members constituting the outer ring in which the inner peripheral portion of the outer ring is formed as a groove extending in the circumferential direction, in advance;

a coupling process of coupling and integrating the shrouds of the plurality of turbine vane members belonging to one of a plurality of turbine vane member groups made by grouping the plurality of turbine vane members, by the plate member;

an intermediate unit manufacturing process of manufacturing an intermediate unit by fitting the shrouds of the plurality of turbine vane members coupled and integrated by the plate member into an inner peripheral portion of the outer ring member so that the plate member seals at least a portion of each of the shrouds that protrude from the inner peripheral portion of the outer ring to the radially inward side of a shroud gap formed between the shrouds adjacent to each other in the circumferential direction; and

a connection process of connecting the intermediate unit to a unit in which the plurality of turbine vane members belonging to the other turbine vane member group is fitted into the outer ring member.

8. The method for manufacturing a turbine according to claim 7 , wherein the unit is constituted as the intermediate unit.

9. A turbine comprising:

a shaft body supported rotatably;

a plurality of turbine blade members that is provided on an outer periphery of the shaft body and constitutes a turbine blade row in a circumferential direction of the shaft body;

a casing covering the shaft body and the turbine blade row;

an outer ring that is provided on an inner periphery of the casing and includes an inner peripheral portion in which a cross-section having an uneven shape is continuous in a circumferential direction;

a plurality of turbine vane members that each has a shroud fitted into the inner peripheral portion of the outer ring and a turbine vane main body extending from the shroud to a radially inward side and that is provided in the circumferential direction and constitutes a turbine vane row in which the shrouds adjacent to each other are aligned in the circumferential direction; and

a plate member that connects at least some of the plurality of turbine vane members and covers one side of the shrouds in an axial direction, thereby sealing a shroud gap formed between the shrouds adjacent to each other in the circumferential direction,

wherein the inner peripheral portion of the inner ring is formed as a groove extending in the circumferential direction, and

the plate member seals a portion of the shroud gap inside the outer ring and at least a portion of each of the shrouds that protrude from the inner peripheral portion of the outer ring to the radially inward side of the shroud gap.

10. The turbine according to claim 9 , wherein the plate member is provided over the circumference of the entirety of the plurality of shrouds.

11. The turbine according to claim 9 , wherein the plate member seals the entire shroud gap.