US 11,834,957 B2
Strut cover, exhaust casing, and gas turbine
Tomoyuki Hirata, Yokohama (JP); Eiichi Tsutsumi, Yokohama (JP); Kazuki Kitagawa, Yokohama (JP); and Takayoshi Iijima, Yokohama (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/634,052
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Sep. 9, 2020, PCT No. PCT/JP2020/034097
§ 371(c)(1), (2) Date Feb. 9, 2022,
PCT Pub. No. WO2021/049523, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 2019-165806 (JP), filed on Sep. 12, 2019.
Prior Publication US 2022/0325635 A1, Oct. 13, 2022
Int. Cl. F01D 25/26 (2006.01); F01D 25/28 (2006.01); F01D 25/30 (2006.01)
CPC F01D 25/26 (2013.01) [F01D 25/28 (2013.01); F01D 25/30 (2013.01); F05D 2220/32 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A strut cover for a gas turbine, comprising:
a cylindrical sheet metal member having a hollow portion; and
a flare member that is connected to one end of the cylindrical sheet metal member in an axial direction of the cylindrical sheet metal member and includes a curved portion having an outer surface such that a distance from a center axis of the cylindrical sheet metal member to the outer surface increases with increasing a distance from the cylindrical sheet metal member in the axial direction,
wherein the flare member has a thickness larger than a minimum thickness of the cylindrical sheet metal member at least in the curved portion,
wherein an inner surface of the curved portion of the flare member protrudes toward the center axis with respect to an inner surface of the cylindrical sheet metal member,
wherein the flare member includes:
a connection end connected to the cylindrical sheet metal member; and
a flange portion disposed on an opposite side of the curved portion from the connection end, and
wherein, in a cross-section along the center axis, the flare member bulges at a bulge portion on an opposite side of a tangential line from the cylindrical sheet metal member, the tangential line being tangential to an inner surface of the flange portion in an outer peripheral region of the flange portion,
wherein, in the cross-section along the center axis, an inner surface of the bulge portion of the flare member that bulges on the opposite side of the tangential line from the cylindrical sheet metal member curves convexly,
wherein, in the cross-section along the center axis, the curved portion of the flare member includes a thick-walled portion that protrudes toward the center axis of the cylindrical sheet metal member with respect to the inner surface of the cylindrical sheet metal member, and an inner surface of the thick-walled portion curves convexly, and
wherein the inner surface of the bulge portion and the inner surface of the thick-walled portion are connected to form a convexly-curved curve.