MODULAR TURBOMACHINE INNER AND OUTER CASINGS WITH MULTI-STAGE STEAM EXTRACTION SITES

摘要

Various embodiments include methods and apparatuses of forming turbomachine casing intermediate structures. In some embodiments apparatuses include a steam turbomachine casing intermediate structure including an inner shell having an external surface and inner shell cavity, and defining an opening for allowing fluid entry to the cavity and an outer shell having an internal surface, these surfaces defining at least one closed, axial-extending chamber, the inner shell and outer shells each having access regions adjacent the closed chamber, each of the access regions including a plurality of locations, selectable to be machined to create an exhaust slot or an exhaust opening in the inner casing or the outer casing, respectively, and wherein a structural integrity of the casing is uniform regardless of which of the axial locations are selected to be machined, where the exhaust opening is fluidly connected with the at least one closed chamber through the outer shell.

主权项

1. A steam turbomachine casing intermediate structure comprising:
an inner shell having an external surface, wherein a material of the inner shell defines an inner shell cavity, and wherein the material of the inner shell defines an opening for allowing fluid from a steam path of the turbomachine to enter the inner shell cavity; and an outer shell having an internal surface, the internal surface of the outer shell and the external surface of the inner shell defining at least one closed chamber extending in an axial direction of the steam turbomachine, the inner shell having a first access region adjacent the at least one closed chamber, the first access region including a plurality of inner shell axial locations, wherein at least one of the plurality of inner shell axial locations is selectable to be machined to create an exhaust slot for allowing fluid to exit the inner shell cavity and enter the at least one closed chamber, and wherein a structural integrity of the casing is uniform regardless of which of the inner shell axial locations is selected to be machined, the outer shell having a second access region adjacent the at least one closed chamber, the second access region including a plurality of outer shell axial locations, wherein at least one of the plurality of outer shell axial location is selectable to be machined to create an exhaust opening fluidly connected with the at least one closed chamber through the outer shell and wherein the structural integrity of the casing is uniform regardless of which of the outer shell axial locations is selected to be machined.