US 11,898,461 B2
Axial flow turbine
Chongfei Duan, Tokyo (JP); Hideaki Sugishita, Tokyo (JP); Kazuyuki Matsumoto, Tokyo (JP); Hideki Ono, Tokyo (JP); Yoshihiro Kuwamura, Tokyo (JP); Kiyoshi Segawa, Yokohama (JP); and Hisataka Fukushima, Yokohama (JP)
Assigned to MITSUBISH HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/628,401
Filed by Mitsubishi Power, Ltd., Yokohama (JP)
PCT Filed Jul. 30, 2020, PCT No. PCT/JP2020/029279
§ 371(c)(1), (2) Date Jan. 19, 2022,
PCT Pub. No. WO2021/020518, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 2019-141489 (JP), filed on Jul. 31, 2019.
Prior Publication US 2022/0268161 A1, Aug. 25, 2022
Int. Cl. F01D 5/22 (2006.01); F01D 5/20 (2006.01); F01D 11/02 (2006.01); F16J 15/447 (2006.01)
CPC F01D 5/225 (2013.01) [F01D 5/20 (2013.01); F01D 11/02 (2013.01); F16J 15/4472 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An axial flow turbine comprising:
a rotor extending along an axis;
a plurality of rotating blades each having a rotating blade body extending from the rotor outward in a radial direction and a shroud provided at an outside end portion of the rotating blade body in the radial direction, and arranged at intervals in a circumferential direction;
a casing surrounding the rotating blades from an outer side in the radial direction and having a recessed portion formed on an inner peripheral surface to accommodate the shrouds;
a fin protruding from a facing surface of the recessed portion of the casing, which faces the shroud, inward in the radial direction, wherein a clearance is formed between the fin and an outer peripheral surface of the shroud;
a stator blade support portion disposed close to a downstream end of the rotor with respect to the recessed portion on the inner peripheral surface of the casing;
a plurality of stator blades each extending from the stator blade support portion inward in the radial direction and arranged at intervals in the circumferential direction; and
an annular partition plate extending from a recessed portion downstream surface of the recessed portion, which is a surface on close to the downstream end of the rotor, toward an upstream end of the rotor and centered on the axis,
wherein a bypass flow path, is formed in the casing, wherein the bypass flow path has a first end formed in the recessed portion downstream surface and a second end formed in the inner peripheral surface of the casing.