US 12,276,203 B2
Steam turbine exhaust chamber and steam turbine
Nao Taniguchi, Tokyo (JP); Ryo Takata, Tokyo (JP); and Soichiro Tabata, Yokohama (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 18/012,015
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Aug. 13, 2021, PCT No. PCT/JP2021/029802
§ 371(c)(1), (2) Date Dec. 21, 2022,
PCT Pub. No. WO2022/039107, PCT Pub. Date Feb. 24, 2022.
Claims priority of application No. 2020-137367 (JP), filed on Aug. 17, 2020.
Prior Publication US 2023/0258104 A1, Aug. 17, 2023
Int. Cl. F01D 25/30 (2006.01); F01D 25/24 (2006.01); F01D 25/32 (2006.01)
CPC F01D 25/30 (2013.01) [F01D 25/24 (2013.01); F01D 25/32 (2013.01); F05D 2220/31 (2013.01); F05D 2240/126 (2013.01); F05D 2260/602 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A steam turbine exhaust chamber for guiding steam after passing through a rotor blade of a final stage of a steam turbine to outside of the steam turbine, the steam turbine exhaust chamber comprising:
a casing;
a bearing cone disposed along a circumferential direction of a rotor of the steam turbine inside the casing; and
a flow guide disposed along the circumferential direction at a radially outer side of the bearing cone inside the casing, the flow guide forming a diffuser flow passage between the flow guide and the bearing cone,
wherein an inner surface of the casing includes an inner circumferential surface extending along an axial direction of the rotor at a radially outer side of the flow guide and a side wall surface connecting the inner circumferential surface and the bearing cone,
wherein a first protruding portion is formed on the side wall surface along the circumferential direction above a horizontal plane including a rotational axis of the rotor, the first protruding portion protruding outward in a radial direction of the rotor,
wherein the first protruding portion is positioned at an outer side, in the radial direction, of a downstream end of an inner circumferential surface of the flow guide in at least a partial range in the circumferential direction,
wherein a root end of the first protruding portion is positioned inward in a radial direction of the rotor than a tip end of the first protruding portion, the root end of the first protruding portion being fixed to the side wall surface,
wherein the tip end of the first protruding portion is with distance from the side wall surface and the inner circumferential surface; and
wherein a tip end portion of the first protruding portion is bended toward the side wall surface in the axial direction.