US 12,291,970 B2
Carbon seal assembly
Pantcho P. Stoyanov, West Hartford, CT (US); Jonathan F. Zimmitti, Glastonbury, CT (US); and Nasr A. Shuaib, Watertown, MA (US)
Assigned to RTX Corporation, Farmington, CT (US)
Filed by RTX Corporation, Farmington, CT (US)
Filed on Jun. 15, 2023, as Appl. No. 18/335,462.
Application 18/335,462 is a division of application No. 16/791,324, filed on Feb. 14, 2020, granted, now 11,692,449.
Prior Publication US 2023/0323782 A1, Oct. 12, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F16J 15/16 (2006.01); F01D 11/00 (2006.01); F01D 25/00 (2006.01); F01D 25/18 (2006.01); F16J 15/30 (2006.01)
CPC F01D 11/003 (2013.01) [F01D 25/005 (2013.01); F01D 25/186 (2013.01); F16J 15/162 (2013.01); F16J 15/30 (2013.01); F05D 2240/55 (2013.01); F05D 2300/224 (2013.01); F05D 2300/611 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A gas turbine comprising:
a compressor section including at least one compressor rotor, and a turbine section including at least one turbine rotor, with a shaft connecting said at least one turbine rotor to said at least one compressor rotor and there being a bearing compartment including at least one bearing for supporting said at least one shaft;
a seal assembly for sealing an axially upstream end of said bearing compartment and an axially downstream end of said bearing compartment, each of said upstream end sealed by an upstream seal having a carbon seal with a sealing surface and a seal seat having a seal surface fixed to said at least one shaft for rotation relative to the carbon seal, and a diamond-like carbon coating at least partially forming the sealing surface on the seal seat; and
wherein the diamond-like carbon coating includes a sp2 content that is greater than a sp3 content.