US 12,123,323 B2
Fixing structure for turbine rotor blade
Tsutomu Yoshihara, Yokohama Kanagawa (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION, Kawasaki (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION, Kawasaki (JP)
Filed on May 24, 2023, as Appl. No. 18/322,771.
Claims priority of application No. 2022-190026 (JP), filed on Nov. 29, 2022.
Prior Publication US 2024/0175366 A1, May 30, 2024
Int. Cl. F01D 5/30 (2006.01); F01D 5/32 (2006.01)
CPC F01D 5/3007 (2013.01) [F01D 5/326 (2013.01); F05D 2240/80 (2013.01); F05D 2250/75 (2013.01); F05D 2260/36 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A fixing structure for a turbine rotor blade for fixing a blade implantation portion of the turbine rotor blade in axial insertion-type implantation form in a blade groove formed in a rotor wheel of a turbine rotor, the fixing structure comprising:
a fixing groove penetrating the blade implantation portion and the rotor wheel in a circumferential direction of the turbine rotor;
a locking blade, of the turbine rotor blade, lastly fitted into the blade groove; and
a fixing member inserted from an axial direction of the turbine rotor into the fixing groove formed in the blade implantation portion of the locking blade and the rotor wheel forming the blade groove into which the blade implantation portion of the locking blade is fitted,
the fixing member comprising:
an inner peripheral fixing member disposed on a radially inner side of the fixing groove;
an outer peripheral fixing member disposed on a radially outer side of the fixing groove;
a center fixing member fitted between the inner peripheral fixing member and the outer peripheral fixing member, and
a bent portion provided at an end portion on a downstream side in the axial direction in the inner peripheral fixing member or the outer peripheral fixing member, the bent portion being bent to the center fixing member side to fix the blade implantation portion of the locking blade in the blade groove,
wherein the fixing groove includes an axial groove portion and a radial groove portion, the axial groove portion has an opening at one end, the opening is open to the downstream side in the axial direction, the radial groove portion extends radially outward and radially inward from an other end side of the axial groove portion, the fixing groove is constituted by a groove in a T-shaped cross-sectional shape,
in a case where the bent portion is provided at the inner peripheral fixing member,
in being disposed in the fixing groove, the inner peripheral fixing member includes a first axially extending portion extending in the axial direction and having the bent portion projecting from the opening to the downstream side at one end and a first fitting portion extending radially inward from an other end side of the first axially extending portion to be fitted into the radial groove portion, the inner peripheral fixing member is constituted by a member in an L-shaped cross-sectional shape, and
in being disposed in the fixing groove, the outer peripheral fixing member includes a second axially extending portion extending in the axial direction and a second fitting portion extending radially outward from an upstream end side of the second axially extending portion to be fitted into the radial groove portion, the outer peripheral fixing member is constituted by a member in an L-shaped cross-sectional shape.