US 12,215,789 B2
Labyrinth seal and gas turbine
Takahiro Ando, Kobe (JP); Shoichi Shimomura, Kobe (JP); Naoya Tanabashi, Kobe (JP); Shinya Makino, Kobe (JP); and Masahiro Yamamoto, Kobe (JP)
Assigned to KAWASAKI JUKOGYO KABUSHIKI KAISHA, Kobe (JP)
Appl. No. 17/909,820
Filed by KAWASAKI JUKOGYO KABUSHIKI KAISHA, Kobe (JP)
PCT Filed Mar. 10, 2021, PCT No. PCT/JP2021/009564
§ 371(c)(1), (2) Date Sep. 7, 2022,
PCT Pub. No. WO2021/199992, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-064024 (JP), filed on Mar. 31, 2020.
Prior Publication US 2024/0200663 A1, Jun. 20, 2024
Int. Cl. F16J 15/447 (2006.01); F01D 11/02 (2006.01)
CPC F16J 15/4472 (2013.01) [F01D 11/02 (2013.01); F16J 15/447 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A labyrinth seal comprising:
a first structure including at least three seal fins located at intervals in an axial direction; and
a second structure opposed to the first structure and including at least three step surfaces whose radial positions are different from each other, a radial gap being between each seal fin and a corresponding closest step surface, wherein:
the second structure is such that when any one of the seal fins is regarded as a reference seal fin, a portion of the second structure which is located downstream of the reference seal fin does not overlap the reference seal fin when viewed in the axial direction;
the second structure includes an inlet wall located upstream of a most upstream one of the seal fins, a radial gap being between the inlet wall and the first structure; and
an axial position of each seal fin coincides with a downstream end portion of the corresponding closest step surface.