Flexible heat shields and method

• US 20060054233A1
• Filed: 09/15/2004
• Published: 03/16/2006
• Est. Priority Date: 09/15/2004
• Status: Active Grant

• Current Assignee: Pratt & Whitney Canada Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Pratt & Whitney Canada Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Prociw, Lev Alexander, Shafique, Harris, Kojovic, Alexsandar
• Granted Patent: US 7,481,248 B2
• Time in Patent Office: Days
• US Class Current: 138/149
• CPC Class Codes: F02C 7/222 Fuel flow conduits, e.g. manifolds
• CPC Class Codes: F05D 2260/941 particularly aimed at mechanical or thermal stress reduction
• CPC Class Codes: F16L 59/026 Mattresses, mats, blankets or the like
• CPC Class Codes: F16L 59/029 layered
• CPC Class Codes: F16L 59/143 Pre-insulated pipes

Abstract

A heat shield comprises a flexible inner jacket configured and disposed to be fitted around at least a portion of a component, and a flexible outer jacket configured and disposed to be fitted around the inner jacket.

Claims

1. A heat shield for a component, the heat shield comprising:

a flexible inner jacket configured and disposed to be fitted around at least a portion of the component, the inner jacket comprising at least one layer of meshed thermal insulation material; and

a flexible outer jacket configured and disposed to be fitted around the inner jacket, the outer jacket comprising at least one layer of meshed wires intersected by braze wires.

2. The heat shield as defined in claim 1, wherein the thermal insulation material comprises ceramic fibres.

3. The heat shield as defined in claim 1, wherein the inner and outer jackets are substantially cylindrical.

4. The heat shield as defined in claim 1, wherein component is a stem part of a fuel nozzle.

5. The heat shield as defined in claim 1, wherein the inner and outer jackets have a non-linear shape.

6. A heat shield for a component, the component having at least one portion to be covered by the heat shield, the heat shield comprising:

a flexible thermal insulation inner jacket covering the at least one portion of the component; and

an outer jacket covering the inner jacket between two opposite ends of the heat shield, the outer jacket comprising meshed wires wherein at least some junctions between wires of the meshed wires are attached by attachment points made from braze wires.

7. The heat shield as defined in claim 6, wherein at each end of the heat shield, the outer jacket is secured to the component.

8. The heat shield as defined in claim 7, wherein the outer jacket comprises opposite end portions where the attachment points are provided at a higher density than that of an intermediary portion between the end portions.

9. The heat shield as defined in clam 6, wherein the inner and outer jackets have a non-linear shape.

10. A method of installing a heat shield on a component, the method comprising:

providing a flexible inner thermal-insulation jacket and a flexible outer jacket between two ends of the component the outer jacket being made of meshed wires and further comprising a plurality of braze wires intersecting the meshed wires;

securing ends of the outer jacket over the ends of the component;

heating the braze wires to melt it and form attachment points; and

then

cooling the attachment points until they solidify.

11. The method as defined in claim 10, wherein the inner jacket and outer jacket are provided simultaneously on the component.

12. The method as defined in claim 10, wherein the inner jacket is provided on the component before the outer jacket.

13. The method as defined in claim 10, wherein securing the ends of the outer jacket over the ends of the component comprises:

spot welding together some of the meshed wires before the braze wires are melted.