INNER CASING WITH IMPULSE AND REACTION STAGES FOR A STEAM TURBINE ENGINE

摘要

A steam turbine (10) includes an outer casing (22) and an inner casing (12) disposed within the outer casing. The inner casing is horizontally split in an axial direction (16) into an upper inner casing portion (24) and a lower inner casing portion (26). The steam turbine also includes an impulse stage (40) disposed within the inner casing (12), wherein the inner casing is configured to provide full arc admission of a fluid to the impulse stage (40). The steam turbine further includes at least one reaction stage (42) having multiple blades. The at least one reaction stage is integrated within the inner casing for limiting the pressure exerted on the outer casing.