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US 11,692,449 B2Granted
Carbon seal assembly
AssigneeRaytheon Technologies Corporation
InventorsPantcho P. Stoyanov, Jonathan F. Zimmitti, Nasr A. Shuaib
Life of this patent
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Abstract
A seal assembly includes a carbon seal that has a sealing surface. A seal seat has a sealing surface and is positioned for rotation relative to the carbon seal. A diamond-like carbon coating at least partially forms the sealing surface on the seal seat.
Claims20
A seal assembly comprising:
- a carbon seal having a sealing surface facing a first axial direction;
- a seal seat having a sealing surface facing a second axial direction opposite the first axial direction, the seal seat is positioned for rotation relative to the carbon seal and the seal seat includes a recess extending in a circumferential direction forming a complete ring and defining an opening facing in the second axial direction with a radially inner portion of the sealing surface located radially inward of the recess and a radially outer portion of the sealing surface located radially outward from the recess;
- an insert located in the recess;
- and
- a diamond-like carbon coating at least partially forming the sealing surface on the insert, wherein the diamond-like carbon coating includes a sp2 content that is greater than a sp3 content.
2 more elements
A seal assembly comprising:
- a carbon seal having a sealing surface;
- a shaft having a sealing surface and positioned for rotation relative to the carbon seal, wherein a radially outer surface of the shaft includes a recess that forms a complete circumferential recess around the shaft;
- an insert located in the recess;
- and
- a diamond-like carbon coating at least partially forming the sealing surface on the insert, wherein the diamond-like carbon coating includes a sp2 content that is greater than a sp3 content.
2 more elements
A seal assembly comprising:
- a carbon seal;
- a shaft having a shaft sealing surface and positioned for rotation relative to the carbon seal, wherein a radially outer surface of the shaft includes a shaft recess that forms a complete circumferential recess around the shaft;
- a shaft insert located in the shaft recess;
- a shaft diamond-like carbon coating at least partially forming the shaft sealing surface on the shaft insert, wherein the shaft diamond-like carbon coating includes a sp2 content that is greater than a sp3 content;
- a static structure including a static structure recess facing radially inward towards the shaft;
- a static insert located in the static structure recess;
- and
- a static diamond-like carbon coating at least partially forming a carbon seal sealing surface on the static insert and in contact with the carbon seal, wherein the static diamond-like carbon coating includes a sp2 content that is greater than a sp3 content;
- wherein the carbon seal includes an attachment surface located adjacent the static insert.
6 more elements
Dependencies are inferred from the claim text.