Double flow reheat diaphragm
AssigneeGeneral Electric Company
InventorJohn M. Hess
Life of this patent
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Abstract
In a double flow section of a steam turbine, the inner web of the diaphragm surrounding the rotor shaft in the region of divergence of the steam flow paths, is fabricated in the form of two cylindrical shells which are held together either in a fixed position or in a relatively fixed position which permits some slight axial motion between the shells. This form of diaphragm eliminates a number of machining and fabrication alignment problems and additionally permits differential axial expansion of the two pieces occurring as a result of internal thermal steam conditions.
Claims15
An inner web of a diaphragm for use in a double flow section of a steam turbine having a rotor shaft with a plurality of bucket wheels affixed thereto, said wheels rotate about the axis of said shaft between a plurality of stationary nozzle rings formed by curved partitions, said web comprising:
- a first cylindrical shell formed in two joinable halves for surrounding a portion of said rotor shaft, said first shell having at least two circular grooves along the inner periphery thereof for holding steam packing material in close proximity to said rotor shaft, said first shell also having a surface around the outer periphery of a first end thereof for attachment of curved partitions;
- a second cylindrical shell formed in two joinable halves for surrounding the second end of said first shell, said second end being displaced along said axis from said first end, and said second shell also having a surface around the outer periphery thereof for attachment of curved partitions;
- and
- means for holding said second shell in a relatively fixed position around said first shell but permitting limited axial movement between said first and said second shell.
An inner web of a diaphragm for use in a double flow section of a steam turbine having a rotor shaft with a plurality of bucket wheels affixed thereto, said wheels rotate about the axis of said shaft between a plurality of stationary nozzle rings formed by curved partitions, said web comprising:
- a first cylindrical shell formed in two joinable halves for surrounding a portion of said rotor shaft, said first shell having at least two circular grooves along the inner periphery thereof for holding steam packing material in close proximity to said rotor shaft, said first shell also having a surface around the outer periphery of a first end thereof for attachment of curved partitions, and including a second end which is displaced along said axis from said first end;
- a second cylindrical shell formed in two joinable halves, said second shell also having a surface around the outer periphery thereof for attachment of curved partitions;
- and
- means for holding said second shell in a fixed position against the second end of said first shell.
An inner web of a diaphragm for use in a double flow section of a steam turbine having a rotor shaft with a plurality of bucket wheels affixed thereto, said wheels rotate about the axis of said shaft between a plurality of stationary nozzle rings formed by curved partitions, said web comprising:
- a first cylindrical shell formed in two joinable halves for surrounding a portion of said rotor shaft, said first shell having at least two circular grooves on the inner periphery thereof for holding steam packing material in close proximity to said rotor shaft, said first shell also having a surface surrounding the outer periphery of a first end thereof for attachment of curved partitions and including a second end which is axially displaced from said first end;
- a second cylindrical shell formed in two joinable halves for surrounding the second end of said first shell, said second shell also having a surface around the outer periphery thereof for attachment of curved partitions;
- and
- means for joining said second shell to said first shell, said joining means permitting limited axial movement between said first and said second shell.
Dependencies are inferred from the claim text.