Method of manufacturing a heat shield for a fuel manifold

• US 7,559,142 B2
• Filed: 10/24/2006
• Issued: 07/14/2009
• Est. Priority Date: 09/26/2006
• Status: Active Grant

• Current Assignee: Pratt & Whitney Canada Corporation (Rtx Corporation)
• Original Assignee: Pratt & Whitney Canada Corporation (Rtx Corporation)
• Inventors: Rudrapatna, Nagaraja, Morenko, Oleg, Patel, Bhawan B.
• Primary Examiner(s): Bryant; David P
• Assistant Examiner(s): Afzali; Sarang
• Application Number:
  US11/552,240
• Publication Number:
  US 20080078080A1
• Time in Patent Office: 994 Days
• Field of Search: 298/892, 295/250.1, 295/251.1, 294/211, 294/16, 607/34, 607/39
• US Class Current: 29/889.2
• CPC Class Codes: F02C 3/145 the combustion chamber being in the reverse flow-type
• CPC Class Codes: F02C 7/222 Fuel flow conduits, e.g. manifolds
• CPC Class Codes: Y10T 29/4932 Turbomachine making
• CPC Class Codes: Y10T 29/49391 Tube making or reforming
• CPC Class Codes: Y10T 29/49796 Coacting pieces
• CPC Class Codes: Y10T 29/49805 Shaping by direct application of fluent pressure
• CPC Class Codes: Y10T 29/49947 by applying separate fastener

Abstract

A method of manufacturing a heat shield for a manifold ring of a gas turbine engine, comprising forming a tubular portion of heat shield material with an arcuate longitudinal axis, deforming the tubular portion such that a cross-section thereof defines a profile corresponding to at least two complementary heat shield portions configured to cooperate to significantly surround at least a circumferential portion of the manifold ring, and cutting the tubular portion to divide the tubular portion into each of the heat shield portions.

Claims

1. A method for producing a manifold ring having a heat shield for a gas turbine engine, the method comprising:

providing a tubular portion of heat shield material, the tubular portion having an arcuate longitudinal axis and an annular cross-section;

hydroforming the tubular portion to change its shape such that a cross-section thereof defines a profile corresponding to at least two complementary heat shield portions, the heat shield portions being configured to cooperate to significantly surround at least a circumferential portion of the manifold ring;

cutting the tubular portion to divide the tubular portion into each of the heat shield portions, and then positioning the divided heat shield portions around the circumferential portion of the manifold ring, such that the manifold ring is substantially enclosed by the heat shield portions.

2. The method as defined in claim 1, further comprising a step of assembling the divided heat shield portions with a plurality of removable fasteners.

3. The method as defined in claim 2, wherein assembling the detached heat shield portions includes inserting each of the removable fasteners through a bore defined in the manifold ring to interconnect at least two of the heat shield portions.

4. The method as defined in claim 1, wherein deforming the tubular portion is such that the profile corresponds to the at least two complementary heat shield portions and at least one connection portion extending between successive ones of the heat shield portions, and cutting the tubular portion includes removing the at least one connection portion from the tubular portion.

5. The method as defined in claim 1, further including performing a stress relieving operation on the tubular portion after deforming the tubular portion.

6. The method as defined in claim 1, wherein providing the tubular portion includes extruding the heat shield material to define a straight tube and curving the tube to obtain the tubular portion.

7. The method as defined in claim 1, wherein providing the tubular portion includes rolling a sheet of the heat shield material, attaching opposed longitudinal edges of the rolled sheet together to define a straight tube and curving the tube to obtain the tubular portion.

8. The method as defined in claim 1, further including selecting the heat shield material as one of a heat resistant stainless steel and a heat resistant alloy of nickel, chromium and iron before forming the tubular portion.