Oil slinger with convective cooling of radial surface

• US 10,443,732 B2
• Filed: 03/21/2016
• Issued: 10/15/2019
• Est. Priority Date: 12/13/2013
• Status: Active Grant

• Current Assignee: Rtx Corporation
• Original Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Clark, Thomas E., Mundell, Eric Charles, Grogg, Gary L.
• Primary Examiner(s): Fulton, Kristina R
• Assistant Examiner(s): Koneru, L. Susmitha
• Application Number:
  US15/075,955
• Publication Number:
  US 20160238135A1
• Time in Patent Office: 1,303 Days
• CPC Class Codes: F01D 25/12 Cooling
• CPC Class Codes: F01D 25/18 Lubricating arrangements of machines or engines in general F01M
• CPC Class Codes: F01D 25/183 Sealing means
• 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: F05D 2220/323 for aircraft propulsion, e.g. jet engines
• CPC Class Codes: F05D 2230/60 Assembly methods
• CPC Class Codes: F05D 2240/55 Seals
• CPC Class Codes: F05D 2260/20 Heat transfer, e.g. cooling
• CPC Class Codes: F16J 15/168 which permits material to be continuously conveyed
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

Oil slinger systems include a seal runner comprising an annular radial member having a radius (R) and an outer axially extending member having an axial length (L) such that a ratio (L/R) is between 0.8 and 1.4, the annular radial member disposed at a first angle with respect to the outer axially extending member, a heat shield in mechanical communication with the seal runner, and a volume bounded by an outer face of the annular radial member and an inner face of the heat shield. Methods of radial convective cooling include pumping a cooling liquid through the oil slinger system and convectively cooling the oil slinger.

Claims

1. An oil slinger system comprising:

a seal runner comprising an annular radial member having a radius (R), an inner axially extending member, and an outer axially extending member having an axial length (L) such that a ratio (L/R) of the axial length to the radius is between 0.8 and 1.4, the annular radial member disposed at a first angle with respect to the outer axially extending member and the annular radial member disposed at a second angle with respect to the inner axially extending member;

a heat shield in mechanical communication with the seal runner; and

a volume bounded by an outer face of the annular radial member and an inner face of the heat shield;

wherein the inner axially extending member comprises a radial oil passage positioned at a junction between the inner axially extending member and the annular radial member

wherein the radial oil passage is configured to permit a lubricating oil to pass through the inner axially extending member to an inner face of the annular radial member, opposite the outer face of the annular radial member, such that the lubricating oil is driven by centrifugal force in the radially outward direction along the inner face of the annular radial member from the inner axially extending member to the outer axially extending member.

2. The oil slinger system according to claim 1, wherein the inner axially extending member comprises a lower oil passage configured to receive the lubricating oil, wherein the lubricating oil passes from the lower oil passage and through the inner axially extending member to the inner face of the annular radial member.

3. The oil slinger system according to claim 1, wherein the outer axially extending member of the seal runner defines a radially outward surface configured to interface with a seal assembly, wherein the heat shield terminates radially inward of the radially outward surface of the outer axially extending member of the seal runner.

4. The oil slinger system according to claim 1, wherein the volume is hermetically sealed from adjacent regions.

5. The oil slinger system according to claim 1, wherein the second angle is between about 75 degrees and about 90 degrees.

6. The oil slinger system according to claim 1, wherein the second angle is 90 degrees.

7. The oil slinger system according to claim 1, wherein the ratio (L/R) of the axial length to the radius is 1.

8. The oil slinger system according to claim 1, wherein the length (L) of the outer axially extending member is greater than an axial length (I) of the inner axially extending member.

9. A cooling system comprising:

a cooling liquid; and

the oil slinger system according to claim 1.

10. The oil slinger system according to claim 1, wherein the inner face of the annular radial member comprises at least one of a groove extending in a radial direction and a rib extending in a radial direction.

11. The oil slinger system according to claim 1, wherein the seal runner comprises at least one of steel, titanium, and alloys thereof.

12. The oil slinger system according to claim 1, wherein a distance (D) between the heat shield and the annular radial member of the seal runner is such that a ratio (D/R) of the distance to the radius is between about 0.02 and about 0.20.

13. The oil slinger system according to claim 12, wherein the ratio (D/R) of the distance to the radius is between about 0.05 and 0.08.

14. A method of assembling an oil slinger system comprising:

disposing a heat shield in mechanical communication with a seal runner, wherein the seal runner comprises an annular radial member having a radius (R) and an outer axially extending member having an axial length (L) such that a ratio (L/R) is between 0.8 and 1.4, the annular radial member disposed at a first angle with respect to the outer axially extending member;

pressing the seal runner axially onto a shaft; and

forming a volume bounded by an outer face of the annular radial member and an inner face of the heat shield.

15. The method of claim 14 wherein the seal runner further comprises an inner axially extending member, the inner axially extending member disposed at a second angle with respect to the annular radial member, wherein the inner axially extending member comprises

a lower oil passage configured to receive a lubricating oil;

and

a radial oil passage configured to permit the lubricating oil to pass from the lower oil passage and through the inner axially extending member to an inner face of the annular radial member.

16. The method of claim 14, further comprising disposing the shaft in mechanical communication with a turbine.

17. The method of claim 15, wherein the second angle is between about 75 degrees and about 90 degrees.

18. A method of radial convective cooling comprising:

pumping a cooling liquid through an oil slinger system; and

convectively cooling the oil slinger, wherein the oil slinger comprises

a seal runner comprising an annular radial member having a radius (R) and an outer axially extending member having an axial length (L) such that a ratio (L/R) is between 0.8 and 1.4, the annular radial member disposed at a first angle with respect to the outer axially extending member;

a heat shield in mechanical communication with the seal runner; and

a volume bounded by an outer face of the annular radial member and an inner face of the heat shield.

19. The method of claim 18, wherein the seal runner further comprises an inner axially extending member, the inner axially extending member disposed at a second angle with respect to the annular radial member, wherein the inner axially extending member comprises

a lower oil passage configured to receive a lubricating oil;

and

a radial oil passage configured to permit the lubricating oil to pass from the lower oil passage and through the inner axially extending member to an inner face of the annular radial member.