Fuel manifold heat shield for a gas turbine engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02C-007/22
F23K-005/06
F23K-005/14
F23R-003/28
출원번호
US-0429789
(2012-03-26)
등록번호
US-8978383
(2015-03-17)
발명자
/ 주소
Patel, Bhawan B.
Morenko, Oleg
출원인 / 주소
Pratt & Whitney Canada Corp.
대리인 / 주소
Norton Rose Fulbright Canada LLP
인용정보
피인용 횟수 :
1인용 특허 :
8
초록▼
A fuel manifold assembly for a gas turbine engine is described and includes an annular manifold body and an annular heat shield assembly mounted to and surrounding the manifold body. The heat shield assembly has an inner surface facing the manifold body and spaced apart therefrom by an inner air gap
A fuel manifold assembly for a gas turbine engine is described and includes an annular manifold body and an annular heat shield assembly mounted to and surrounding the manifold body. The heat shield assembly has an inner surface facing the manifold body and spaced apart therefrom by an inner air gap, which substantially surrounds the manifold body, defined therebetween. The heat shield assembly has an outer surface facing away from the manifold body and spaced apart from the inner surface by an outer air gap substantially surrounding the inner air gap. At least the outer air gap is formed by a double wall configuration of the heat shield assembly.
대표청구항▼
1. A fuel manifold assembly for a gas turbine engine comprising: an annular manifold body defined around an axis, with at least one fuel inlet, a plurality of fuel nozzle outlets, and at least one internal fuel passages connecting the at least one inlet to the plurality of fuel nozzle outlets;an ann
1. A fuel manifold assembly for a gas turbine engine comprising: an annular manifold body defined around an axis, with at least one fuel inlet, a plurality of fuel nozzle outlets, and at least one internal fuel passages connecting the at least one inlet to the plurality of fuel nozzle outlets;an annular heat shield assembly mounted to and surrounding the manifold body, the heat shield assembly having an inner surface facing the manifold body and being spaced apart therefrom by an inner air gap defined therebetween, the inner air gap substantially surrounding the manifold body, and the heat shield assembly having an outer surface facing away from the manifold body and spaced apart from the inner surface by an outer air gap substantially surrounding the inner air gap, at least the outer air gap being formed by a double wall configuration of the heat shield assembly. 2. The fuel manifold assembly of claim 1, wherein the heat shield assembly includes a front half having an axially-oriented U-shape cross-section, and a rear half having an axially-oriented U-shape cross section and being matingly shaped to snugly engage the front half with the annular manifold body therebetween. 3. The fuel manifold assembly of claim 2, wherein both the front half and the rear half have said double wall configuration formed by an outer sheet metal member secured to an internal sheet metal member with at least a portion of the outer air gap spacing therebetween. 4. The fuel manifold assembly of claim 2, wherein in a first one of the front half and the rear half, the inner sheet metal member has straight ends and the outer sheet metal member has bent ends secured to the inner sheet metal member, and in the other one of the front half and the rear half, the outer sheet metal member has straight ends and the inner sheet metal member has bent ends secured to the outer sheet metal member; wherein the bent ends of at least one of the front half and the rear half are formed with an annular groove receiving a rope seal trapped therein. 5. The fuel manifold assembly of claim 1, wherein the heat shield assembly has a plurality of nozzle apertures, and further comprising a plurality of nozzles having a neck extending through corresponding ones of the nozzle apertures and into corresponding ones of the nozzle outlets. 6. The fuel manifold assembly of claim 1, wherein the annular heat shield assembly has at least one inlet aperture corresponding to the at least one inlet, and at least one corresponding inlet conduit extending through the at least one inlet aperture. 7. The fuel manifold assembly of claim 1, further comprising at least one pressure equalization hole extending across the annular heat shield assembly for pressure equalization between the internal air gap, the outer air gap, and the region around the fuel manifold assembly. 8. The fuel manifold assembly of claim 1, further comprising at least three circumferentially interspaced fastener arrangements mounting the annular heat shield assembly to the annular manifold body, said fastener arrangements comprising a bolt having a head received on an outer surface of the annular heat shield assembly, a shaft extending across the annular heat shield assembly and through a bore defined in the manifold body with a tip protruding from the annular heat shield assembly and fastened opposite the head, the bore being wider than the shaft and an air space being formed therebetween, and two bushings snugly receiving corresponding portions of the shaft and snugly received in the bore on opposite sides of the manifold body. 9. The fuel manifold assembly of claim 1, wherein at least one of an outer-facing surface of the annular heat shield assembly and an outer-facing surface of the annular manifold body is coated with a reflective coating. 10. A heat shield assembly for a gas turbine engine fuel manifold having an annular body around an axis, with at least one fuel conduit formed therein and extending along an arc-shaped path in the annular body between a fuel inlet and at least one fuel outlet, the heat shield assembly comprising: a front shield member having a recess shaped to axially receive at least a portion of the annular body of the fuel manifold therein, a double wall portion with a dead air gap therein, and two free edges forming an opening to the recess; anda rear shield member having a recess shaped to axially receive at least a portion of the annular body of the fuel manifold therein, a double wall portion with a dead air gap therein, and two free edges forming an opening to the recess, the rear shield member being snugly engaged with the front shield member for the recesses to unite with the annular body therein and an inner air gap being formed between the annular body and an internal face of the engaged shield members and an outer air gap including the dead air gaps being formed between the internal face of the engaged shield members and an external face of the engaged shield members;wherein the combined inner air gap and outer air gap form a thermal insulation system for the fuel conduit. 11. The heat shield assembly of claim 10, wherein the front shield member and the rear shield member each include an inner sheet metal pressing and an outer sheet metal pressing and forming corresponding walls of the double wall portion. 12. The heat shield assembly of claim 11, wherein in a first one of the front shield member and the rear shield member, the inner sheet metal pressing has straight ends leading to the free edges and the outer sheet metal member has inwardly bent ends secured to the inner sheet metal pressing, and in the second one of the front shield member and the rear shield member, the outer sheet metal pressing has straight ends leading to the free edges and the inner sheet metal pressing has bent ends secured to the outer sheet metal member. 13. The heat shield assembly of claim 12, wherein the free edges of the inner sheet metal pressing of the first shield member abut against the inner surface of the second shield member upon said engagement, past the bent ends, and the outer air gap further includes a spacing between overlapping portions of the engaged shield members. 14. The heat shield assembly of claim 12, wherein the bent ends of at least one of the front shield member and the rear shield member are formed with an annular rope-seal-receiving groove and the bent ends of the other one of the front shield member and the rear shield member are formed to maintain the rope seal trapped within the corresponding grooves upon said engagement. 15. The fuel manifold assembly of claim 10, further comprising an outer seal between the front half and the rear half, positioned axially-outward relative the manifold body and an inner seal between the front shield member and the rear shield member, positioned axially-inward relative the manifold body, upon said engagement. 16. The fuel manifold assembly of claim 10, wherein the heat shield assembly has a plurality of nozzle apertures each formed through a corresponding portion of both the front shield member and the rear shield member. 17. The fuel manifold assembly of claim 10, wherein the heat shield assembly has at least one inlet aperture formed through a corresponding portion of both the front shield member and the rear shield member. 18. The fuel manifold assembly of claim 10, further comprising at least one pressure equalization hole extending across the double wall portions of both the front shield member and the rear shield member. 19. The fuel manifold assembly of claim 10, wherein both the front shield member and the rear shield member are annular and span around the entire annular body upon said engagement.
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이 특허에 인용된 특허 (8)
Shafique, Harris; Prociw, Lev Alexander, Dual conduit fuel manifold for gas turbine engine.
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