초록 ▼

The second-stage nozzles include a plurality of stator vanes 10 having first, second, third, fourth and fifth passages 40, 42, 44, 46 and 48, respectively, for cooling the vanes. The first and fourth passages have a steam inlet along an outer sidewall 14 and a junction box 70 along the inner sidewal

The second-stage nozzles include a plurality of stator vanes 10 having first, second, third, fourth and fifth passages 40, 42, 44, 46 and 48, respectively, for cooling the vanes. The first and fourth passages have a steam inlet along an outer sidewall 14 and a junction box 70 along the inner sidewall 12 for returning steam to the second passage 42. The third passage 44 has a contour corresponding to the contour of the leading edge and impingement steam is directed through openings in a partition 52, cooling the leading edge. Steam flows from the third passage 44 directly into the return passage 42 and also into a channel 64 for cooling the inner sidewall 12. Cooling air flows through fifth passage 48 radially inwardly through the inner sidewall 12 into a cavity 72 in the diaphragm 32 for flow axially outwardly into wheel cavities 86 and 88.

대표청구항 ▼

1. In a turbine having multiple turbine stages, a nozzle stage comprising: a plurality of stator vanes having circumferentially extending inner and outer sidewalls, with said vanes extending radially therebetween and circumferentially spaced one from the other to define a plurality of nozzles; s

1. In a turbine having multiple turbine stages, a nozzle stage comprising: a plurality of stator vanes having circumferentially extending inner and outer sidewalls, with said vanes extending radially therebetween and circumferentially spaced one from the other to define a plurality of nozzles; said vanes having leading and trailing edges and at least one of said vanes having a plurality of generally radially extending interior passages spaced form one another between its leading and trailing edges; first and second passages of said plurality thereof establishing generally radially inwardly and outwardly directed first and second steam paths, respectively; means providing an inlet for flowing steam radially inwardly through said first passage; a third passage of said plurality of passages within said one vane adjacent the leading edge thereof and extending substantially the full radial extent of said one vane defining a leading edge cooling steam path; means establishing communication between said first passage and said third passage including a plurality of radially spaced openings between said first passage and said third passage for directing steam from said first passage into said third passage for impingement cooling of the leading edge of said one vane; means carried by said inner sidewall and in communication with said third passage and said second passage defining a path for flowing steam from said third passage cavity to said second passage; said steam inlet means comprising a chamber in said outer sidewall having a steam inlet to said chamber and a steam outlet from said chamber in communication with said first passage, and an impingement plate in said chamber between said steam inlet and said steam outlet and having a plurality of apertures therethrough for impingement steam cooling of the outer sidewall; and means defining a fourth passage extending radially through said one vane and located between said third passage and said trailing edge, and means for flowing cooling steam radially inwardly along said fourth passage for convectively cooling the walls of said one vane, means carried by said inner sidewall and in communication with said fourth passage defining a steam path for flowing steam from said fourth passage to said second passage, and a collar extending through said outer sidewall for receiving return steam from said second passage for flow through said outer sidewall, and a collar extending through said outer sidewall for flowing extraction air through said outer sidewall into said fifth passage. 2. In a turbine having multiple turbine stages, a nozzle stage comprising: a plurality of stator vanes having circumferentially extending inner and outer sidewalls, with said vanes extending radially therebetween and circumferentially spaced one from the other to define a plurality of nozzles; said vanes having leading and trailing edges and at least one of said vanes having a plurality of generally radially extending interior passages spaced from one another between its leading and trailing edges; first and second passages of said plurality thereof establishing generally radially inwardly and outwardly directed first and second steam paths, respectively; means providing an inlet for flowing steam radially inwardly through said first passage; a third passage of said plurality of passages within said one vane adjacent the leading edge thereof and extending substantially the full radial extent of said one vane defining a leading edge cooling steam path; means establishing communication between said first passage and said third passage including a plurality of radially spaced openings between said first passage and said third passage for directing steam from said first passage into said third passage for impingement cooling of the leading edge of said one vane; means carried by said inner sidewall and in communication with said third passage and said second passage defining a path for flowing steam form said third passage cavity to said second passage; and means defining a fourth passage extending radially through said one vane and located between said third passage and said trailing edge, and means for flowing cooling steam radially inwardly along said fourth passage for convectively cooling the walls of said one vane, and means carried by said inner sidewall and in communication with said fourth passage defining a steam path for flowing steam form said fourth passage to said second passage. 3. A nozzle stage according to claim 2 wherein said means carried by said inner sidewall define a junction box located radially inwardly of said inner sidewall, means defining a fifth passage extending radially through said one vane at a location between said fourth passage and said trailing edge, means for flowing cooling air radially inwardly along said fifth passage for cooling the walls of said vane, said turbine including first and second-stage turbine wheels on opposite sides of said stator stage, a diaphragm between said turbine wheels defining a cavity radially inwardly of said inner sidewall, said fifth passage lying in communication with said diaphragm cavity, said diaphragm cavity lying in heat-exchange relation with said junction box whereby air from said fifth passage cools the steam in said junction box. 4. A nozzle stage according to claim 2 wherein said turbine includes first and second-stage turbine wheels on opposite sides of said stator stage, a diaphragm between said turbine wheels and defining with said turbine wheels wheel cavities on opposite sides of said diaphragm, means defining a fifth passage extending radially through said one vane at a location between said fourth passage and said trailing edge, and means for supplying air from said fifth passage into said wheel cavities. 5. A nozzle stage according to claim 2 including means defining a fifth passage extending radially through said one vane at a location between said fourth passage and said trailing edge, a plurality of pins extending across said fifth passage at radially spaced locations therealong for promoting heat exchange between the walls of said vanes and the air flowing through said fifth passage. 6. In a turbine having multiple turbine stages, a nozzle stage comprising: a plurality of stator vanes having circumferentially extending inner and outer sidewalls, with said vanes extending radially therebetween and circumferentially spaced one from the other to define a plurality of nozzles; said vanes having leading and trailing edges and at least one of said vanes having a plurality of generally radially extending interior passages spaced from one another between its leading and trailing edges; first and second passages of said plurality thereof establishing generally radially inwardly and outwardly directed first and second steam paths, respectively; means providing an inlet for flowing steam radially inwardly through said first passage; a third passage of said plurality of passages within said one vane adjacent the leading edge thereof and extending substantially the full radial extent of said one vane defining a leading edge cooling steam path; means establishing communication between said first passage and said third passage including a plurality of radially spaced openings between said first passage and said third passage for directing steam from said first passage into said third passage for impingement cooling of the leading edge of said one vane; means carried by said inner sidewall and in communication with said third passage and said second passage defining a path for flowing steam form said third passage cavity to said second passage; and means defining a fourth passage extending radially through said one vane and disposed between said third passage and said trailing edge, and said inlet means enabling flow of cooling steam radially inwardly along said fourth passage for convectively cooling the walls of said one vane; and means defining a fifth passage extending radially through said one vane at a location between said fourth passage and said trailing edge, and means for flowing cooling air radially inwardly along said fifth passage for cooling the walls of said vane. 7. In a turbine having multiple turbine stages, a nozzle stage comprising: a plurality of stator vanes having circumferentially extending inner and outer sidewalls, with said vanes extending radially therebetween and circumferentially spaced one from the other to define a plurality of nozzles; said vanes having leading and trailing edges and at least one of said vanes having a plurality of generally radially extending interior passages spaced from one another between its leading and trailing edges; first and second passages of said plurality thereof establishing generally radially inwardly and outwardly directed first and second steam paths, respectively; means providing an inlet for flowing steam radially inwardly through said first passage; a third passage of said plurality of passages within said one vane adjacent the leading edge thereof and extending substantially the full radial extent of said one vane defining a leading edge cooling steam path; means establishing communication between said first passage and said third passage including a plurality of radially spaced openings between said first passage and said third passage for directing steam from said first passage into said third passage for impingement cooling of the leading edge of said one vane; means carried by said inner sidewall and in communication with said third passage and said second passage defining a path for flowing steam form said third passage cavity to said second passage, said path defining means including means establishing communication at radially spaced locations along said vane between said third passage and said second passage for directing cooling steam from said third passage along interior wall surfaces of said one vane into said second passage in a direction generally normal to the radially direction of said passages for convective cooling of the interior wall surfaces of the vane. 8. A nozzle stage according to claim 7 wherein said third passage is defined in part by a radially extending outer wall surface and a radially extending partition, said radially extending outer wall surface generally conforming to the outer surface contour of said leading edge of said one vane and forming substantially a reverse image of said outer surface contour, said openings being located in said partition to direct cooling steam form said first passage against said outer wall surface for impingement cooling the leading edge of said one vane. 9. A nozzle stage according to claim 7 wherein said openings are located to direct cooling steam from said first passage against said outer wall surface for impingement cooling opposite sidewalls of said one vane adjacent said leading edge, said directing means including a plurality of radially spaced openings along both sides of said vane affording communication between said third passage and said second passage. 10. A nozzle stage according to claim 7 including means defining a fourth passage extending radially through said one vane and disposed between said third passage and said trailing edge, and said inlet means enabling flow of cooling steam radially inwardly along said fourth passage for convectively cooling the walls of said one vane. 11. A nozzle stage according to claim 10 including ribs formed along interior wall surfaces forming part of said fourth passage for increasing the surface area contact with cooling steam for promoting cooling of the vane. 12. A nozzle stage according to claim 7 wherein said steam inlet means comprises a chamber in said outer sidewall having a steam inlet to said chamber and a steam outlet from said chamber in communication with said first passage, and an impingement plate in said chamber between said steam inlet and said steam outlet and having a plurality of apertures therethrough for impingement steam cooling of the outer sidewall. 13. In a turbine having multiple turbine stages, a nozzle stage comprising: a plurality of stator vanes having circumferentially extending inner and outer sidewalls, with said vanes extending radially therebetween and circumferentially spaced one from the other to define a plurality of nozzles; said vanes having leading and trailing edges and at least one of said vanes having a plurality of generally radially extending interior passages spaced from one another between said leading and trailing edges; a passage of said plurality thereof for supplying cooling steam generally radially inwardly therealong; means providing an inlet for flowing steam radially inwardly along said supply passage; one of said plurality of passages including a cooling steam passage within said one vane adjacent the leading edge thereof and extending substantially the full radial extent of said one vane; means establishing communication between said steam supply passage and said leading edge cooling steam passage including a plurality of spaced openings therebetween for directing steam from said steam supply passage into said leading edge cooling steam passage for impingement cooling of the leading edge of said one vane; another of said plurality of passages located between said steam supply passage and the trailing edge of said vane defining an air cooling passage, and means for flowing cooling air radially inwardly along said air passage for cooling the walls of said vane; said steam inlet means comprising a chamber in said outer sidewall including a steam inlet to said chamber, a steam outlet from said chamber in communication with said steam supply passage and an impingement plate in said chamber between said steam inlet and said steam outlet and having a plurality of apertures therethrough for impingement steam cooling of the outer sidewall. 14. A nozzle stage according to claim 13 wherein another of said plurality of passages includes a steam return passage for flowing steam radially outwardly of said one vane, an means in communication with said steam supply passage and said return passage for flowing steam from said supply passage to said return passage. 15. A nozzle stage according to claim 13 wherein said leading edge cooling steam passage is defined in part by a radially extending outer wall surface and a radially extending partition, said radially extending outer wall surface generally conforming to the contour of said leading edge of said one vane and forming its reverse side, said openings being located in said partition to direct cooling steam from said steam supply passage against said outer wall surface for impingement cooling the leading edge of said one vane. 16. A nozzle stage according to claim 14 including means establishing communication at radially spaced locations between said leading edge cooling steam passage and said return steam passage for directing cooling steam from said leading edge cooling steam passage along interior wall surfaces of said one vane into said return steam passage. 17. A nozzle according to claim 13 wherein said turbine includes first and second-stage turbine wheels on opposite sides of said stator stage, a diaphragm between said turbine wheels defining a cavity radially inwardly of said inner sidewall and having apertures for communication with wheel cavities on opposite sides of said diaphragm, said air cooling passage lying in communication with said diaphragm cavity and with said wheel cavities through said apertures for heat-exchange relation in said wheel cavities. 18. A nozzle stage according to claim 13 wherein said turbine includes first and second-stage turbine wheels on opposite sides of said stator stage, a diaphragm between said turbine wheels and defining with said turbine wheels wheel cavities on opposite sides of said diaphragm, and means for supplying air from said air cooling passage into said wheel cavities.