Ring seal system with reduced cooling requirements
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01D-009/00
출원번호
US-0243146
(2005-10-04)
등록번호
US-7278820
(2007-10-09)
발명자
/ 주소
Keller,Douglas A.
출원인 / 주소
Siemens Power Generation, Inc.
인용정보
피인용 횟수 :
29인용 특허 :
21
초록▼
Aspects of the invention are directed to systems for reducing the cooling requirements of a ring seal in a turbine engine. In one embodiment, the ring seal can be made of a ceramic material, such as a ceramic matrix composite. The ceramic ring seal can be connected to metal isolation rings by a plur
Aspects of the invention are directed to systems for reducing the cooling requirements of a ring seal in a turbine engine. In one embodiment, the ring seal can be made of a ceramic material, such as a ceramic matrix composite. The ceramic ring seal can be connected to metal isolation rings by a plurality of pins. The hot gas face of the ring seal can be coated with a thermal insulating material. In another embodiment, the ring seal can be made of metal, but it can be operatively associated with a ceramic heat shield. The metal ring seal can carry the mechanical loads imposed during engine operation, and the heat shield can carry the thermal loads. By minimizing the amount of ring seal cooling, the ring seal systems according to aspects of the invention can result in improved engine performance and emissions.
대표청구항▼
What is claimed is: 1. A ring seal system comprising: a vane carrier having an inner peripheral surface; a forward isolation ring and an aft isolation ring spaced axially downstream of the forward isolation ring, wherein the isolation rings are attached to the vane carrier such that the isolation r
What is claimed is: 1. A ring seal system comprising: a vane carrier having an inner peripheral surface; a forward isolation ring and an aft isolation ring spaced axially downstream of the forward isolation ring, wherein the isolation rings are attached to the vane carrier such that the isolation rings extend substantially circumferentially about and substantially radially inward from the inner peripheral surface of the vane carrier; and a ceramic ring seal enclosed within the vane carrier, wherein the ring seal is operatively connected to the forward and aft isolation rings by a plurality of elongated fasteners, whereby differential thermal growth between the isolation rings and the ring seal is permitted, wherein the ring seal includes a forward span, an aft span and an axial extension connecting therebewteen, wherein the aft span of the ring seal is adapted to substantially matingly engage the aft isolation ring, wherein at least a portion of the aft span and the aft isolation ring are coated with a wear resistant material. 2. The system of claim 1 wherein the ring seal includes a gas path face, wherein at least a portion of the gas path face is coated with a thermal insulating material. 3. The system of claim 1 wherein the ring seal includes a forward span, an aft span and an axial extension connecting therebewteen. 4. The system of claim 3 wherein the elongated fasteners are pins, wherein a plurality of pins are affixed to the forward isolation ring and extend substantially axially therefrom, wherein the forward span of the ring seal includes a plurality of cutouts, wherein each cutout receives a respective one of the plurality of pins. 5. The system of claim 3 wherein the ring seal is positioned such that the forward span is located axially downstream of at least a portion of the forward isolation ring, and such that the aft span is located axially upstream of the aft isolation ring. 6. The system of claim 5 wherein an angle between the aft span and the axial extension is less than 90 degrees. 7. The system of claim 5 wherein the elongated fasteners are pins, wherein a plurality of pins are removably attached to the aft isolation ring and extend substantially axially therefrom, wherein the aft span of the ring seal includes a plurality of cutouts, wherein each cutout receives a respective one of the plurality of pins. 8. The system of claim 3 wherein the ring seal is positioned such that the forward span is located axially downstream of at least a portion of the forward isolation ring, and such that the aft span is located axially downstream of at least a portion of the aft isolation ring. 9. The system of claim 8 wherein the angle between the aft span and the axial extension is about 90 degrees. 10. The system of claim 8 wherein the elongated fasteners are pins, wherein a plurality of pins are removably attached to the aft isolation ring and extend substantially axially therefrom, wherein the aft span of the ring seal includes a plurality of cutouts, wherein each cutout receives a respective one of the plurality of pins. 11. A ring seal system comprising: a metal ring seal having an axial upstream face and an axial downstream face; and a ceramic heat shield having a forward span and an aft span, wherein the forward span is operatively connected to the axial upstream face of the ring seal by a plurality of fasteners, and wherein the aft span is operatively connected to the axial downstream face of the ring seal by a plurality of fasteners, such that the heat shield is spaced from the ring seal, whereby a space is defined therebetween wherein a plurality of cooling supply holes extend through the ring seal so as to be in fluid communication with the space, wherein the cooling supply holes are located closer to the axial upstream face of the ring seal than the axial downstream face, wherein the aft span of the heat shield includes at least one exit passage extending therethrough and in fluid communication with the space between the ring seal and the heat shield. 12. The system of claim 11 wherein the heat shield is positioned such that the forward span is axially upstream of the axial upstream face of the ring seal and such that the aft span is axially downstream of the axial downstream face. 13. The system of claim 11 wherein the fasteners extend through cutouts provided in the heat shield and into engagement with the ring seal. 14. The system of claim 11 further including a side seal, wherein the ring segment has opposite circumferential ends, wherein the ring seal includes a recess in one of the circumferential ends, and wherein a portion of the side seal is received within the recess. 15. The system of claim 11 further including at least one seal plate, wherein a first gap is defined between the axial upstream face of the ring seal and the forward span of the heat shield, and a second gap is defined between the axial downstream face of the ring seal and the aft span of the heat shield, wherein the seal plate is attached to the ring seal so as to at least partially obstruct fluid communication with the space through the gaps, whereby fluid leakage through the gaps is minimized. 16. The system of claim 11 wherein the ring seal includes a radially inner side, wherein the radially inner side includes a plurality of cooling channels.
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