Heat shield, systems and methods

• US 10,443,440 B2
• Filed: 04/09/2015
• Issued: 10/15/2019
• Est. Priority Date: 04/09/2015
• Status: Active Grant

• Current Assignee: Rtx Corporation
• Original Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Socha, Pawel, Reuben, Jonathan C, Cutler, Bret B
• Primary Examiner(s): Schneider, Craig M
• Assistant Examiner(s): Deal, David R
• Application Number:
  US14/682,767
• Publication Number:
  US 20160326910A1
• Time in Patent Office: 1,650 Days
• Field of Search: 138110
• CPC Class Codes: F01D 25/162 Bearing supports
• CPC Class Codes: F01D 25/18 Lubricating arrangements of machines or engines in general F01M
• CPC Class Codes: F01D 25/28 Supporting or mounting arrangements, e.g. for turbine casing
• CPC Class Codes: F01D 9/02 Nozzles; Nozzle boxes; Stator blades; Guide conduits , e.g. individual nozzles nozzle boxes F01D9/047
• CPC Class Codes: F01D 9/065 Fluid supply or removal conduits traversing the working fluid flow, e.g. for lubrication-, cooling-, or sealing fluids see also F01D25/16, F01D25/24 and F01D25/26
• CPC Class Codes: F01M 11/02 Arrangements of lubricant conduits
• CPC Class Codes: F05D 2230/00 Manufacture
• CPC Class Codes: F05D 2230/54 by sheet metal manufacturing
• CPC Class Codes: F05D 2240/12 Fluid guiding means, e.g. vanes
• CPC Class Codes: F05D 2240/15 Heat shield
• CPC Class Codes: F05D 2240/50 Bearings
• CPC Class Codes: F05D 2250/11 triangular
• CPC Class Codes: F05D 2260/231 Preventing heat transfer
• CPC Class Codes: F05D 2260/98 Lubrication
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A heat shield comprising a base portion, a top portion, and a tapered portion extending between the top portion and the bottom portion is described herein, in accordance with various embodiments. The base portion may comprise a sheet metal bounding a triangular void. The top portion may comprise a sheet metal bounding an ovular void.

Claims

1. A lubricating assembly comprising:

an oil tube,

a fitting attached to the oil tube, wherein the fitting is configured to receive a fluid from the oil tube; and

a heat shield attached to the oil tube, wherein the heat shield comprises;

a base portion, wherein the base portion bounds a first void;

a top portion, wherein the top portion bounds a second void; and

a tapered portion extending between the base portion and the top portion;

wherein the top portion is attached directly to the oil tube, and

the base portion surrounds the fitting.

2. The lubricating assembly of claim 1, wherein the oil tube is a dual wall oil tube comprising an inner wall and an outer wall.

3. The lubricating assembly of claim 2, wherein the heat shield is manufactured via a hydro-forming process.

4. The lubricating assembly of claim 2, wherein the heat shield comprises at least one of a nickel-chromium based alloy and a stainless steel.

5. The lubricating assembly of claim 2, wherein the outer wall is coupled to the fitting and the inner wall is coupled to the fitting.

6. The lubricating assembly of claim 1, wherein the heat shield is configured to at least partially encase the fitting.

7. The lubricating assembly of claim 6, wherein the heat shield is configured to prevent heat transfer between the fitting and surrounding air.

8. The lubricating assembly of claim 6, wherein the heat shield and the fitting are separated by a gap.

9. The lubricating assembly of claim 1, wherein the top portion comprises a smaller cross-sectional area than the base portion.

10. The lubricating assembly of claim 9, wherein the base portion bounds a triangular void.

11. The lubricating assembly of claim 9, wherein the top portion bounds an ovular void.

12. The lubricating assembly of claim 1, wherein the fitting is attached to a proximal end of the oil tube.

13. The lubricating assembly of claim 1, wherein a geometry of the top portion is complementary to a geometry of the oil tube and a geometry of the base portion is complementary to a geometry of the fitting.

14. The lubricating assembly of claim 1, wherein the top portion is attached to the oil tube via at least one of a weld, a solder, or a braze.

15. The lubricating assembly of claim 1, wherein the oil tube is attached to the fitting via at least one of a weld, a solder, or a braze.

16. The lubricating assembly of claim 1, further comprising:

a mid-turbine frame (MTF) arrangement comprising;

an outer engine case;

an inner engine case disposed radially inward from the outer engine case, the oil tube extending between the outer engine case and the inner engine case; and

a bearing compartment disposed radially inward from the inner engine case;

wherein the fitting is coupled to the bearing compartment and is configured to direct the fluid from the oil tube to the bearing compartment.

17. A method of cooling an oil tube fitting comprising:

coupling a heat shield to an outer surface of an oil tube; and

coupling the oil tube to the oil tube fitting, wherein the oil tube fitting is configured to receive a fluid from the oil tube, the heat shield at least partially encases the oil tube fitting, and the heat shield comprises;

a base portion, wherein the base portion bounds a first void;

a top portion, wherein the top portion bounds a second void; and

a tapered portion extending between the base portion and the top portion, wherein the top portion is attached directly to the oil tube and the base portion surrounds the oil tube fitting.

18. The method of cooling an oil tube fitting of claim 17, further comprising reflecting, by the heat shield, a heat wave away from the oil tube fitting.

19. The method of cooling an oil tube fitting of claim 17, wherein the heat shield is configured to be separated from the oil tube fitting by a gap.

20. The method of cooling an oil tube fitting of claim 17, further comprising hydro-forming the heat shield.