US 11,840,963 B2
Acoustic attenuator, tube assembly, combustor, gas turbine, and method for manufacturing tube assembly
Hirokazu Shiraishi, Yokohama (JP); Tatsuya Nadayoshi, Yokohama (JP); and Kentaro Murakami, Yokohama (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/623,407
Filed by Mitsubishi Power, Ltd., Yokohama (JP)
PCT Filed Jul. 28, 2020, PCT No. PCT/JP2020/028810
§ 371(c)(1), (2) Date Dec. 28, 2021,
PCT Pub. No. WO2021/020372, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 2019-142446 (JP), filed on Aug. 1, 2019.
Prior Publication US 2022/0349346 A1, Nov. 3, 2022
Int. Cl. F02C 7/24 (2006.01); F23R 3/00 (2006.01); F23R 3/16 (2006.01)
CPC F02C 7/24 (2013.01) [F23R 3/002 (2013.01); F23R 3/16 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An acoustic damping device comprising:
a first damping unit including
a first acoustic liner to be attached to an outer surface of an object formed in a tubular shape to form a first liner space communicating with an internal space of the object, and
a first acoustic damper to be provided on an outer surface of the first acoustic liner to form a first damper space communicating with the internal space of the object, the outer surface facing a side opposite the object;
a second damping unit that includes a second acoustic damper disposed away from the first acoustic damper and forming a second damper space and that is to be attached to the outer surface of the object;
a weld portion to be provided at least at a location between the first acoustic damper and the second acoustic damper to fix the second damping unit to the first acoustic liner or to the outer surface of the object; and
a communication portion to be disposed at a position farther from the outer surface of the object than the weld portion, the communication portion being formed in a tubular shape that extends along an axial direction in which a central axis of the object extends, a first end portion of the communication portion being fixed to the first acoustic damper via welding and a second end portion of the communication portion being fixed to the second acoustic damper via welding to thereby allow the first damper space and the second damper space to communicate with each other.