Welded nozzle assembly for a steam turbine and methods of assembly
AssigneeGeneral Electric Company
InventorsSteven Burdgick, Thomas Crall, Thomas Russo
Life of this patent
Estimating the term…
Abstract
A steam turbine nozzle singlet having a blade or airfoil between inner and outer sidewalls is provided. The sidewalls include steps or flanges which are received in complementary recesses in the rings enabling axially short low heat input welds e.g., e-beam welds. These complementary steps and recesses mechanically interlock the singlet between the rings preventing displacement of the singlet in the event of weld failure. The low heat input welds minimize or eliminate distortion of the nozzle flow path. Additional features on the singlets, provide a datum for milling machines to form singlets of different sizes.
Claims18
A nozzle assembly for a turbine comprising:
- at least one nozzle blade having inner and outer sidewalls and, in part, defining a flowpath upon assembly into the turbine;
- an outer ring and an inner ring;
- said outer ring having one of a (i) male projection straddled by a pair of radially outwardly extending female recesses or (ii) a female recess straddled by a pair of radially inwardly extending male projections;
- said outer sidewall having another of a (i) female recess straddled by a pair of radially outwardly extending male projections or (ii) a male projection straddled by a pair of radially inwardly extending female recesses enabling interlocking engagement between said outer ring and said outer sidewall and against relative axial displacement;
- said outer ring and said outer sidewall being welded to one another and said inner ring and said inner sidewall being welded to one another.
A nozzle assembly for a turbine, comprising:
- at least one nozzle blade having inner and outer sidewalls and, in part, defining a flow path upon assembly into the turbine;
- an outer ring and an inner ring;
- said inner ring having one of a (i) male projection straddled by a pair of radially inwardly extending female recesses or (ii) a female recess straddled by a pair of radially outwardly extending male projections;
- said inner sidewall having another of a (i) female recess straddled by a pair of radially inwardly extending male projections or (ii) a male projection straddled by a pair of radially outwardly extending female recesses enabling interlocking engagement between said inner ring and said inner sidewall and against relative axial displacement;
- said outer ring and said outer sidewall being welded to one another and said inner ring and said inner sidewall being welded to one another.
A nozzle assembly for a turbine, comprising:
- at least one nozzle blade having inner and outer sidewalls and, in part, defining a flowpath upon assembly into the turbine;
- said outer sidewall having one of a (i) female recess straddled by a pair of radially outwardly extending male projections or (ii) a male projection straddle by a pair of radially inwardly extending female recesses enabling interlocking engagement with an outer ring of the turbine;
- said inner sidewall having one of a (i) female recess straddled by a pair of radially inwardly extending male projections and (ii) a male projection straddled by a pair of radially outwardly extending female recesses enabling interlocking engagement with an inner ring of the turbine;
- and
- a fixturing element carried by one of said inner and outer sidewalls to facilitate fixturing the nozzle for machining processes.
Dependencies are inferred from the claim text.