GAS TURBINE ENGINE SEAL ASSEMBLIES

• US 20200131935A1
• Filed: 10/24/2018
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• Status: Active Grant

• Current Assignee: Rtx Corporation
• Original Assignee: United Technologies Corporation (Rtx Corporation)
• Inventors: Glahn, Jorn Axel, James, Denman H., Demitraszek, Anthony Sr.
• Granted Patent: US 10,774,684 B2
• Time in Patent Office: Days
• CPC Class Codes: F01D 25/125 of bearings
• CPC Class Codes: F01D 25/16 Arrangement of bearings; Supporting or mounting bearings in casings bearings per se F16C
• CPC Class Codes: F01D 25/183 Sealing means
• CPC Class Codes: F01D 5/18 Hollow blades, i.e. blades with cooling or heating channels or cavities structure of hollow blades in general F01D5/147; Heating, heat-insulating or cooling means on blades
• CPC Class Codes: F01D 5/186 Film cooling F01D5/187 takes precedence
• CPC Class Codes: F02C 7/06 Arrangements of bearings bearings F16C; Lubricating of turbo machines F01D25/18; of machines or engines in general F01M
• CPC Class Codes: F02C 7/28 Arrangement of seals
• CPC Class Codes: F05D 2240/54 Radial bearings
• CPC Class Codes: F05D 2240/55 Seals
• CPC Class Codes: F05D 2260/98 Lubrication
• CPC Class Codes: F16J 15/30 with sealing rings made of carbon
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A gas turbine engine according to an example of the present disclosure includes a shaft rotatable about an axis, a bearing disposed about the shaft and within a bearing compartment, and a seal assembly positioned to seal the bearing compartment. The seal assembly includes a fixed seal and a seal runner rotatable with the shaft. The first axial face and a second axial face axially opposite the first axial face with respect to the axis. The first axial face includes a first surface rotatable against the seal, and the second axial face includes a trough portion. A second surface is angled relative to a radial baseline plane defined perpendicular to the axis, and a dam between the trough portion and the second surface. An oil source is positioned to provide oil into the trough portion.

Claims

1. A gas turbine engine comprising:

a shaft rotatable about an axis;

a bearing disposed about the shaft and within a bearing compartment;

a seal assembly positioned to seal the bearing compartment, the seal assembly comprising;

a fixed seal, and

a seal runner rotatable with the shaft and having a first axial face and a second axial face axially opposite the first axial face with respect to the axis, wherein the first axial face includes a first surface rotatable against the seal, and the second axial face includes a trough portion, a second surface angled relative to a radial baseline plane defined perpendicular to the axis, and a dam between the trough portion and the second surface; and

an oil source positioned to provide oil into the trough portion.

2. The gas turbine engine as recited in claim 1, wherein the fixed seal is a carbon face seal, and the seal runner is metallic.

3. The gas turbine engine as recited in claim 1, wherein the second surface is angled between 0 and 45 degrees from the radial baseline.

4. The gas turbine engine as recited in claim 3, wherein the second surface extends axially away from the trough portion as it extends radially outward.

5. The gas turbine engine as recited in claim 1, wherein the dam is formed by a convex surface including a radially innermost point that is radially inward of a radially outer surface of the trough portion.

6. The gas turbine engine as recited in claim 1, wherein the trough portion is radially inward of at least a portion of the angled surface.

7. The gas turbine engine as recited in claim 1, comprising a nozzle assembly disposed in the bearing compartment in communication with the oil source, wherein the nozzle assembly is positioned to direct oil into the trough portion.

8. The gas turbine engine as recited in claim 7, comprising a second nozzle assembly disposed in the bearing compartment, wherein the second nozzle assembly is positioned to direct oil toward the bearing.

9. The gas turbine engine as recited in claim 1, wherein the seal runner includes a base portion fixed to the shaft, and the trough portion, angled surface, and dam are radially outward of the base portion.

10. The gas turbine engine as recited in claim 1, wherein the seal runner includes a metallic annular body having a base portion, a radially outer portion, and a middle portion connecting the base portion and the radially outer portion, and the first surface and the second surface are provided by the radially outer portion.

11. A gas turbine engine comprising:

a low pressure compressor;

a high pressure compressor;

a combustor in fluid communication with the lox pressure compressor and high pressure compressor;

a low pressure turbine that drives the low pressure compressor;

a high pressure turbine that drives the high pressure compressor through a shaft rotatable about an axis;

a fan driven by the low pressure turbine;

a bearing disposed about the shaft and within a bearing compartment between the high pressure compressor and the low pressure compressor, wherein the high pressure compressor includes an upstream-most stage of airfoils, and the bearing is disposed axially forward of the upstream-most stage relative to the flow of working fluid through the engine;

a seal assembly positioned to seal the bearing compartment, the seal assembly comprising;

a fixed seal, and

a seal runner rotatable with the shaft and having a first axial face and a second axial face axially opposite the first axial face with respect to the axis, wherein the first axial face includes a first surface rotatable against the seal, and the second axial face includes a trough portion, a second surface angled relative to a radial baseline plane defined perpendicular to the axis, and a dam between the trough portion and the second surface; and

an oil source positioned to provide oil into the trough portion.

12. The gas turbine engine as recited in claim 11, wherein the fixed seal is a face seal.

13. The gas turbine engine as recited in claim 11, wherein the seal assembly is axially forward of the bearing.

14. The gas turbine engine as recited in claim 13, wherein the seal is axially forward of the seal runner.

15. The gas turbine engine as recited in claim 14, wherein the bearing is a thrust bearing.

16. The gas turbine engine as recited in claim 15, wherein the fixed seal is a carbon face seal, and the seal runner is metallic.

17. The gas turbine engine as recited in claim 13, comprising

a plurality of nozzle assemblies disposed axially between the seal assembly and the bearing.

18. The gas turbine engine as recited in claim 11, wherein the dam is formed by a convex surface, and the convex surface includes a radially innermost point that is radially inward of a radially outer surface of the trough portion.

19. The gas turbine engine as recited in claim 18, wherein the second surface is angled between 0 and 45 degrees from the radial baseline.

20. The gas turbine engine as recited in claim 19, wherein the fixed seal is a carbon face seal, and the seal runner is metallic.