Bearing-supported seal
A seal according to the present disclosure includes a plate, and a floating shoe supported with respect to the plate in a first direction. The floating shoe has a sealing feature extending in a second direction perpendicular to the first direction. At least one bearing is between the plate and the floating shoe. The bearing is configured to facilitate movement of the floating shoe with respect to the plate in the second direction. A gas turbine engine including the seal and a method of sealing a rotating component with respect to a stationary component are also disclosed.
1. A seal, comprising:
a plate;
a floating shoe supported with respect to the plate in a first direction, the floating shoe having a sealing feature extending in a second direction perpendicular to the first direction; and
at least one bearing between the plate and the floating shoe, the bearing configured to facilitate movement of the floating shoe with respect to the plate in the second direction, wherein the at least one bearing is in at least one of a pocket of the plate and a pocket of the floating shoe.
2. The seal of claim 1 , further comprising at least one beam, the at least one beam configured to maintain movement of the floating shoe substantially in the second direction.
3. The seal of claim 2 , wherein the at least one beam comprises two beams.
4. The seal of claim 1 , wherein the at least one bearing is a roller bearing.
5. The seal of claim 1 , wherein the sealing feature includes one or more sealing teeth.
6. A gas turbine engine, comprising:
a first structure;
a second structure; and
a seal arranged between the first and second structures, the seal including a plate, a floating shoe supported with respect to the plate, the floating shoe having a sealing feature extending towards one of the first structure and the second structure; and at least one bearing between the plate and the shoe, the bearing configured to facilitate movement of the floating shoe with respect to the plate, wherein the at least one bearing is in at least one pocket in one of the plate and the floating shoe, and the at least one pocket is configured to maintain an axial position of the at least one bearing with respect to an engine axis.
7. The gas turbine engine of claim 6 , wherein the plate is on a low-pressure side of the seal.
8. The gas turbine engine of claim 6 , wherein the shoe floats in a radial direction with respect to an engine axis.
9. The gas turbine engine of claim 8 , further comprising at least one beam, the at least one beam configured to maintain movement of the floating shoe substantially in the radial direction.
10. The gas turbine engine of claim 6 , wherein the at least one bearing is a roller bearing.
11. The gas turbine engine of claim 6 , wherein fluid passing between the first structure and the second structure has a higher pressure on a first side of the seal than on a second side of the seal.
12. The gas turbine engine of claim 11 , wherein a pressure gradient of the fluid causes the shoe to move radially with respect to an engine axis to an equilibrium position.
13. The gas turbine engine of claim 6 , wherein the first structure is a stationary structure and the second structure is a rotating structure, and wherein the sealing feature extends towards the rotating structure.
14. The gas turbine engine of claim 6 , wherein the first and second structures are in one of a turbine and a compressor of the gas turbine engine.
15. A method of sealing a stationary structure with respect to a rotating structure, comprising:
supporting a floating shoe against a plate in a first direction, the floating shoe movable with respect to the plate in a second direction perpendicular to the first direction via a bearing between the floating shoe and the plate, wherein the at least one bearing is in at least one pocket in one of the plate and the floating shoe.
16. The method of claim 15 , wherein the floating shoe is movable in response to a pressure gradient of a fluid in the seal.
17. The method of claim 15 , further comprising maintaining a position of the floating shoe with respect to the plate in the first direction via at least one beam.