Diffuser pipe for a gas turbine engine and method for manufacturing same
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16L-009/00
F04D-029/44
F04D-029/66
F01D-009/02
출원번호
US-0138807
(2013-12-23)
등록번호
US-9874223
(2018-01-23)
발명자
/ 주소
Theratil, Ignatius
Abate, Aldo
Balike, Krishna Prasad
출원인 / 주소
PRATT & WHITNEY CANADA CORP.
대리인 / 주소
Norton Rose Fulbright Canada LLP
인용정보
피인용 횟수 :
0인용 특허 :
18
초록▼
A diffuser pipe for a gas turbine engine comprises a hollow pipe body including a first end, a second end fluidly connected to the first end, and at least one flattened area proximate to the second end. A ring is connected to the second end. The ring is an outlet of the diffuser pipe. At least one s
A diffuser pipe for a gas turbine engine comprises a hollow pipe body including a first end, a second end fluidly connected to the first end, and at least one flattened area proximate to the second end. A ring is connected to the second end. The ring is an outlet of the diffuser pipe. At least one stiffener is disposed on the at least one flattened area. The ring and the at least one stiffener reduce vibratory stresses at the second end of the pipe body. A method of manufacturing a diffuser pipe of a gas turbine engine is also presented.
대표청구항▼
1. A diffuser pipe for a gas turbine engine, the diffuser pipe comprising: a hollow pipe body including: a first end connected to a diffuser case, the first end defining an inlet cross-sectional area of the diffuser pipe;a second end fluidly connected to the first end, the second end being a free en
1. A diffuser pipe for a gas turbine engine, the diffuser pipe comprising: a hollow pipe body including: a first end connected to a diffuser case, the first end defining an inlet cross-sectional area of the diffuser pipe;a second end fluidly connected to the first end, the second end being a free end and defining an outlet cross-sectional area of the diffuser pipe, the outlet cross-sectional area being greater than the inlet cross-sectional area; andat least one flattened area proximate to the second end;a ring connected to the second end, the ring being an outlet of the diffuser pipe; andat least one stiffener disposed on the at least one flattened area, the ring and the at least one stiffener reducing vibratory stresses at the second end of the pipe body. 2. The diffuser pipe as defined in claim 1, wherein the at least one stiffener is a raise relative to the at least one flattened area. 3. The diffuser pipe as defined in claim 1, wherein the at least one flattened area includes two flattened areas facing each other and forming a flattened elliptical cross-section at the second end. 4. The diffuser pipe as defined in claim 1, wherein the at least one stiffener is stamped to the at least one flattened area. 5. The diffuser pipe as defined in claim 1, wherein the at least one stiffener includes a straight portion. 6. The diffuser pipe as defined in claim 5, wherein the straight portion is disposed parallel to the ring. 7. The diffuser pipe as defined in claim 5, wherein the straight portion is proximate to the ring. 8. The diffuser pipe as defined in claim 1, wherein the ring is unitary formed. 9. The diffuser pipe as defined in claim 1, wherein the ring is machined. 10. The diffuser pipe as defined in claim 1, wherein the second end is disposed on a first axis; a second axis is perpendicular to the first axis, the first and second axes being generally in plane with the at least flattened area;the pipe body has a first thickness;the ring has a second thickness; anda ratio of the second thickness to the first thickness is comprised between 0.25 and 3. 11. The diffuser pipe as defined in claim 2, the second end is disposed on a first axis; a second axis is perpendicular to the first axis, the first and second axes being generally in plane with the at least flattened area;the pipe body has a first thickness ;the at least one stiffener raises at a second thickness relative to the at least one flattened area in a direction perpendicular to the first and second axes; anda ratio of the second thickness to the first thickness is comprised between 0.25 and 3. 12. The diffuser pipe as defined in claim 3, wherein the second end is disposed on a first axis; a second axis is perpendicular to the first axis, the first and second axes being generally in plane with the at least flattened area;the ring has a width along the second axis;the flattened ellipsoid has a short diameter in a direction perpendicular to the first and second axes; anda ratio of the short diameter to the width of the ring is comprised between 1 and 4. 13. The diffuser pipe as defined in claim 3, wherein the second end is disposed on a first axis; a second axis is perpendicular to the first axis, the first and second axes being generally in plane with the at least flattened area;the at least one stiffener has a span in a direction of the first axis;the flattened ellipsoid has a long diameter along the first axis; anda ratio of the long diameter to the span of the stiffener is comprised between 1.2 and 1.6. 14. The diffuser pipe as defined in claim 3, wherein the second end is disposed on a first axis; a second axis is perpendicular to the first axis, the first and second axes being generally in plane with the at least flattened area;the ring has a width in a direction of the second axis;the at least one stiffener is disposed at a first distance from the ring in the direction of the second axis; anda ratio of the width of the stiffener to the first distance is comprised between 1.2 and 3.5. 15. The diffuser pipe as defined in claim 3, wherein the second end is disposed on a first axis; a second axis is perpendicular to the first axis, the first and second axes being generally in plane with the at least flattened area;the at least one stiffener has a width in a direction of the second axis;the flattened ellipsoid has a short diameter perpendicular to the long diameter; anda ratio of the span of the at least one stiffener to the short diameter is comprised between 1 and 1.25. 16. The diffuser pipe as defined in claim 2, wherein the stiffener includes a straight portion parallel to the ring; the second end is disposed on a first axis;a second axis is perpendicular to the first axis, the first and second axes being generally in plane with the at least flattened area;the straight portion has a first thickness in a direction of the second axis;the at least one stiffener raises at a second thickness relative to the at least one flattened area in a direction perpendicular to the first and second axes; anda ratio of the first thickness to the second thickness is comprised between 4.5and 5. 17. The diffuser pipe as defined in claim 1, wherein the stiffener is any one of D, T, I, X, H, O and Pi shaped. 18. A method of manufacturing a diffuser pipe of a gas turbine engine, the method comprising: forming a hollow diffuser pipe body from at least one sheet metal;a first end connected to a diffuser case, the first end defining an inlet cross-sectional area of the diffuser pipe;a second end fluidly connected to the first end, the second end forming an elliptical cross-section having a major axis, the second end being a free end and defining an outlet cross-sectional area of the diffuser pipe, the outlet cross-sectional area being greater than the inlet cross-sectional area;adding a raised structure on a flat portion of the diffuser pipe body near a free outlet end of the diffuser pipe body; andconnecting a unitary formed ring to the free outlet end of the diffuser pipe body. 19. The method as defined in claim 18, wherein connecting the unitary formed ring to the free outlet end of the diffuser pipe body comprises welding a ring one of machined and cast to the free outlet end of the diffuser pipe body. 20. The method as defined in claim 18, wherein adding the raised structure on a flat portion of the diffuser pipe body includes stamping the flat portion of the diffuser pipe body into the raised portion. 21. A diffuser pipe for a gas turbine engine, the diffuser pipe comprising: a hollow pipe body including: a first end connected to a diffuser case, the first end defining an inlet cross-sectional area of the diffuser pipe;a second end fluidly connected to the first end, the second end forming an elliptical cross-section having a major axis, the second end being a free end and defining an outlet cross-sectional area of the diffuser pipe, the outlet cross-sectional area being greater than the inlet cross-sectional area; andat least one flattened area proximate to the second end;a ring connected to the second end, the ring being an outlet of the diffuser pipe; andat least one stiffener disposed on the at least one flattened area, the stiffener having a span in a direction of the major axis, the span being smaller than a span of the second end along the major axis.
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