US 12,378,900 B1
Exhaust system and gas turbine equipped with same
Tetsuya Shimmyo, Tokyo (JP); Shinya Hashimoto, Tokyo (JP); Norihiko Nagai, Tokyo (JP); and Shingo Yamasue, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed on Mar. 13, 2025, as Appl. No. 19/078,918.
Claims priority of application No. 2024-042420 (JP), filed on Mar. 18, 2024.
Int. Cl. F01D 25/30 (2006.01); F01D 25/24 (2006.01)
CPC F01D 25/30 (2013.01) [F01D 25/243 (2013.01); F05D 2240/55 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An exhaust system comprising:
a first outer diffuser having a cylindrical shape centered on an axis and defining an edge on a radial outer side of an upstream portion of an exhaust flow path through which an exhaust gas which has rotated a turbine rotor passes;
a second outer diffuser disposed on an axial downstream side, between an axial upstream side and the axial downstream side, of the first outer diffuser with a gap therebetween in an axial direction in which the axis extends, having a cylindrical shape centered on the axis, and defining an edge on the radial outer side of a downstream portion of the exhaust flow path through which the exhaust gas having passed through the inside of the first outer diffuser passes;
an exhaust casing having a cylindrical shape centered on the axis and covering an outer circumferential side of the first outer diffuser;
an exhaust chamber having a cylindrical shape centered on the axis and covering an outer side of the second outer diffuser;
a first annular seal device having an annular shape centered on the axis;
a second annular seal device having an annular shape centered on the axis; and
a third annular seal device having an annular shape centered on the axis, wherein
the exhaust casing includes:
an exhaust casing main body having a cylindrical shape centered on the axis; and
an exhaust casing flange extending from an end of the exhaust casing main body on the axial downstream side to the radial outer side with respect to the axis,
the exhaust chamber includes:
an exhaust chamber main body having a cylindrical shape centered on the axis; and
an exhaust chamber flange extending from an end of the exhaust chamber main body on the axial upstream side to the radial outer side to be connected to the exhaust casing flange,
the first annular seal device is provided in the first outer diffuser to suppress an inflow of the exhaust gas into a first outer space between the first outer diffuser and the exhaust casing main body,
the second annular seal device is provided in the second outer diffuser to suppress an inflow of the exhaust gas into a second outer space between the second outer diffuser and the exhaust chamber main body,
the third annular seal device is disposed between the first annular seal device and the second annular seal device in the axial direction, and
the third annular seal device is provided at an end of the first outer diffuser on the axial downstream side to suppress a flow of the exhaust gas to a side of the first annular seal device, or is provided at an end of the second outer diffuser on the axial upstream side to suppress a flow of the exhaust gas to a side of the second annular seal device.