Positioning arrangement having adjustable alignment constraint for low pressure stream turbine inner casing
AssigneeSiemens Energy, Inc.
InventorsRobert F. Wasileski, III, Ira J. Campbell, Johnny R. Dickson
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Abstract
A positioning arrangement (142), including: an outer casing having a frame member (78); a low pressure steam turbine inner casing (140) having an appendage (60) and a threaded hole through the appendage; and an alignment constraint (10) configured to be positioned in the threaded hole and define a positional relationship between the inner casing and the frame member. The alignment constraint includes a main body (14) and a discrete piggyback body (16), both configured to rotate in the threaded hole as a unitary body when in a joined, end-to-end configuration.
Claims18
A positioning arrangement, comprising:
- an outer casing comprising a frame member;
- a low pressure steam turbine inner casing comprising an appendage and a threaded hole through the appendage;
- and
- an alignment constraint configured to be positioned in the threaded hole and to define a positional relationship between the inner casing and the frame member, wherein the alignment constraint comprises a main body, a discrete piggyback body, and an interlocking arrangement configured to permit relative axial movement between the bodies and prevent relative rotational movement between the bodies when the bodies are in an end to end configuration, wherein both bodies are configured to rotate in the threaded hole as a unitary body when in the joined, end-to-end configuration.
An alignment constraint configured to define a positional relationship between a low pressure steam turbine inner casing of a steam turbine and a frame member of an outer casing during operation of the steam turbine, the alignment constraint comprising an externally threaded body, a rotably adjustable foot disposed at a foot end of the threaded body, and a head at a head end of the threaded body, the improvement comprising:
- a main body and a discrete piggyback body that when positioned end-to-end cooperate through an interlocking arrangement to form the externally threaded body, wherein when interlocked, the interlocking arrangement prevents relative rotational movement between the main body and the threaded body, but permits relative axial movement.
A positioning arrangement, comprising:
- an outer casing comprising a frame member;
- a low pressure steam turbine inner casing comprising an appendage comprising a first prong and an opposing prong;
- an alignment constraint configured to be disposed in a threaded hole in the first prong;
- and
- an opposing alignment constraint configured to be disposed in a threaded hole in the opposing prong;
- wherein at least one of the alignment constraints comprises a main body and a discrete piggyback body configured to rotate together as a unitary body when in a joined, end-to-end configuration, wherein each alignment constraint comprises a foot that contacts the frame member, and wherein the feet sandwich the frame member.
Dependencies are inferred from the claim text.