US 12,084,989 B2
Curvature adjustment method for stator blade segment, method for manufacturing stationary body of axial-flow rotary machine, and curvature adjustment jig for stator blade segment
Shin Kato, Tokyo (JP); Shingo Yamasue, Tokyo (JP); Yoshio Tominaga, Tokyo (JP); Ryota Chaki, Tokyo (JP); and Hirokazu Azuma, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 18/282,603
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Feb. 16, 2022, PCT No. PCT/JP2022/006222
§ 371(c)(1), (2) Date Sep. 18, 2023,
PCT Pub. No. WO2022/201988, PCT Pub. Date Sep. 29, 2022.
Claims priority of application No. 2021-053628 (JP), filed on Mar. 26, 2021.
Prior Publication US 2024/0167388 A1, May 23, 2024
Int. Cl. F01D 9/04 (2006.01)
CPC F01D 9/041 (2013.01) [F05D 2230/644 (2013.01); F05D 2240/12 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A curvature adjustment method for a stator vane segment that has an arc-like shape with a plurality of stator vanes attached to an outer peripheral side of an inner connecting member having an arc-like shape such that the stator vanes are arranged in a circumferential direction, the method comprising:
executing a jig preparation step of preparing a curvature adjustment jig that includes a first end, a second end, and a distance adjustment mechanism able to change a distance between the first end and the second end;
executing a jig attachment step of fixing the first end of the curvature adjustment jig to a first position of the inner connecting member and fixing the second end of the curvature adjustment jig to a second position of the inner connecting member that is separated from the first position of the inner connecting member in the circumferential direction in a state where the distance adjustment mechanism of the curvature adjustment jig is disposed on an inner peripheral side of the inner connecting member of the stator vane segment; and
executing a curvature adjustment step of operating the distance adjustment mechanism after the jig attachment step to change the distance between the first end and the second end of the curvature adjustment jig such that a curvature of an outer peripheral edge of the stator vane segment having the arc-like shape is made equal to a target curvature,
wherein an outer peripheral portion of the stator vane segment is configured to fit to an annular groove that is recessed from an inner circumferential surface of the stator vane holding ring, which has an arc-like shape, and
in the curvature adjustment step,
a linear distance between a position where a groove bottom surface of the annular groove comes into contact with a first end of the stator vane segment in the circumferential direction and a position where the groove bottom surface of the annular groove comes into contact with a second end of the stator vane segment in the circumferential direction is measured and the linear distance is set as a target distance, and
adjusting the curvature by changing the distance between the first end and the second end of the curvature adjustment jig such that a linear distance between a first end of the outer peripheral edge of the stator vane segment in the circumferential direction and a second end of the outer peripheral edge of the stator vane segment in the circumferential direction is made equal to the target distance.