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US 10,844,748 B2Granted
Inner casing for steam turbine engine
AssigneeNuovo Pignone S.p.A.
InventorsEnzo Imparato, Marco Grilli, Enrico Giusti
Life of this patent
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Abstract
A system includes a steam turbine. The steam turbine includes an outer casing and an inner casing disposed within the outer casing. The inner casing is horizontally split in an axial direction into an upper inner casing portion and a lower inner casing portion. The steam turbine also includes an impulse stage disposed within the inner casing, wherein the inner casing is configured to provide full arc admission of a fluid to the impulse stage. The steam turbine further includes at least one reaction stage having multiple blades. The at least one reaction stage is integrated within the inner casing.
Claims19
A steam turbine, comprising:
- an outer casing;
- an inner casing disposed within the outer casing, wherein the inner casing is horizontally split in an axial direction into an upper inner casing portion and a lower inner casing portion, wherein the inner casing includes a retainer that interfaces with a portion of the outer casing to block movement of the inner casing relative to the outer casing in response to an axial force generated during operation of the steam turbine, and wherein the inner casing includes a flange comprising an upper flange portion and a lower flange portion;
- and
- at least one steam duct comprising an upper stream duct portion disposed in the upper inner casing portion and a lower steam duct portion disposed in the lower inner casing portion, the at least one steam duct configured to form a sealed interface between the upper and lower flange portions to block leakage of fluid through the sealed interface, the sealed interface comprising an annular seal ring and an anti-rotation mechanism including a first end disposed within a first recess of the annular seal ring and a second end disposed within a second recess of the lower inner casing portion, wherein the first recess and the second recess are aligned with respect to one another, the anti-rotation mechanism configured to block rotation of the annular seal ring relative to the upper and lower steam duct portions, wherein the anti-rotation mechanism extends radially away from the annular seal ring toward an upstream portion of the lower inner casing portion.
1 more element
A steam turbine, comprising:
- an inner casing disposed within an outer casing, wherein the inner casing is horizontally split in an axial direction into an upper inner casing portion including an upper flange portion and a lower inner casing portion including a lower flange portion, the inner casing including a plurality of steam ducts that define a fluid flow path through the upper and lower inner casing portions, at least one of the plurality of steam ducts including an upper steam duct portion disposed in the upper inner casing portion and a lower steam duct portion disposed in the lower inner casing portion;
- wherein the upper steam duct portion and the lower steam duct portion form a sealed interface between the upper and lower flange portions to block leakage of fluid through the sealed interface, the sealed interface comprising an annular seal disposed between the upper and lower steam duct portions and an anti-rotation mechanism including a first end disposed within a first recess of the annular seal and a second end disposed within a second recess of the lower inner casing portion, wherein the first recess and the second recess are aligned with respect to one another, the anti-rotation mechanism configured to block rotation of the annular seal relative to the upper and lower steam duct portions, wherein the anti-rotation mechanism extends radially away from the annular seal ring toward an upstream portion of the lower inner casing portion.
A steam turbine, comprising:
- an inner casing disposed within an outer casing, wherein the inner casing is horizontally split in an axial direction into an upper inner casing portion having an upper flange portion and a lower inner casing portion having a lower flange portion;
- and
- a plurality of steam ducts disposed within the inner casing, at least one of the plurality of steam ducts forming a sealed interface, the sealed interface comprising an annular seal disposed between the upper and lower steam duct portions, and the sealed interface comprising an anti-rotation mechanism including a first end disposed within a first recess of the annular seal and a second end disposed in a second recess of the lower inner casing portion, wherein the first recess and the second recess are aligned with respect to one another, the anti-rotation mechanism configured to block rotation of the annular seal relative to the upper and lower steam duct portions, wherein the anti-rotation mechanism extends radially away from the annular seal ring toward an upstream portion of the lower inner casing portion.
Dependencies are inferred from the claim text.