초록 ▼

Spline seals are formed at the joints between packing casing shells in a steam turbine having high pressure and intermediate pressure turbine sections sealing between the high pressure and intermediate pressure regions on opposite axial sides of the packing casing. The spline seals extend in registe

Spline seals are formed at the joints between packing casing shells in a steam turbine having high pressure and intermediate pressure turbine sections sealing between the high pressure and intermediate pressure regions on opposite axial sides of the packing casing. The spline seals extend in registering grooves from adjacent the seal segments of the rotor radially outwardly to adjacent axial load surfaces cooperable between the outer shell and the packing casing. The spline seals minimize or eliminate steam leakage paths through the horizontal joint of the packing casing shells.

대표청구항 ▼

Spline seals are formed at the joints between packing casing shells in a steam turbine having high pressure and intermediate pressure turbine sections sealing between the high pressure and intermediate pressure regions on opposite axial sides of the packing casing. The spline seals extend in registe

Spline seals are formed at the joints between packing casing shells in a steam turbine having high pressure and intermediate pressure turbine sections sealing between the high pressure and intermediate pressure regions on opposite axial sides of the packing casing. The spline seals extend in registering grooves from adjacent the seal segments of the rotor radially outwardly to adjacent axial load surfaces cooperable between the outer shell and the packing casing. The spline seals minimize or eliminate steam leakage paths through the horizontal joint of the packing casing shells. said grooves for sealing about the rotor, said axially spaced grooves and said packing seal segments having cooperable axial load surfaces, said spline seal and said registering endface grooves of said shells extending from adjacent one of said axial load surfaces and the axial seal face. 5. A turbine according to claim 1 wherein said spline seal and said registering endface grooves extend arcuately in a generally radial direction. 6. A turbine according to claim 1 wherein each said spline seal includes a cloth surrounding said spline seal along opposite sides thereof and about at least a pair of opposite edges thereof. 7. A turbine according to claim 1 wherein each said spline seal comprises a seal body having an enlargement along opposite edges and received in said slots with the enlargements adjacent bases of said slots, respectively. 8. A turbine according to claim 7 wherein said seal body is formed of sheet metal, said enlargements comprising integral bent margins of said sheet metal spline seal having edges facing central portions of said sheet metal spline. 9. A steam turbine comprising: axially spaced high and intermediate pressure turbine sections about a common rotor; an outer shell about the high and intermediate pressure sections and the rotor; a packing casing intermediate said high and intermediate pressure sections separating high and intermediate pressure regions on axially opposite sides of the packing casing, said packing casing having an axial load surface bearing against an axial load surface carried by said shell for precluding axial movement of said packing casing relative to said shell in response to the pressure differential between the high and intermediate pressure regions; said packing casing being formed of a pair of arcuate shells having circumferentially registering endfaces joined to one another forming a pair of joints therebetween and extending between said shell and said rotor substantially adjacent a horizontal midline of the turbine; registering grooves in each of the endfaces of the packing casing at each joint thereof; and spline seals in said registering grooves in each joint sealing between the high and intermediate pressure regions and extending in a generally radial direction from adjacent the rotor to adjacent the axial load surfaces of said packing casing and said shell. 10. A turbine according to claim 9 wherein said packing casing includes a plurality of arcuate axially spaced grooves and arcuate packing seal segments in said grooves for sealing about the rotor, said axially spaced grooves and said packing seal segments having cooperable axial load surfaces, said spline seal and said registering endface grooves of said shells extending from adjacent the cooperable axial load surface of said packing seal segments and said grooves to adjacent the axial load surfaces of said packing casing and said outer shell. 11. A turbine according to claim 9 wherein each said spline seal includes a cloth surrounding said spline seal along opposite sides thereof and about at least a pair of opposite edges thereof. 12. A turbine according to claim 9 wherein each said spline seal comprises a seal body having an enlargement along opposite edges and received in said slots with the enlargements adjacent bases of said slots, respectively. 13. A turbine according to claim 9 wherein said seal body is formed of sheet metal, said enlargements comprising integral bent margins of said sheet metal spline seal having edges facing central portions of said sheet metal spline. 14. In a steam turbine having axially spaced high and intermediate pressure sections about a common rotor, an outer shell about the high and intermediate pressure sections and the rotor, a packing casing intermediate the high and intermediate pressure sections and separating high and intermediate pressure regions on axially opposite sides of the packing casing, said packing casing being formed of a pair of arcuate shells having circ