US20060245923A1 - Arcuate nozzle segment and related method of manufacture - Google Patents

Arcuate nozzle segment and related method of manufacture Download PDF

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Publication number
US20060245923A1
US20060245923A1 US11/115,371 US11537105A US2006245923A1 US 20060245923 A1 US20060245923 A1 US 20060245923A1 US 11537105 A US11537105 A US 11537105A US 2006245923 A1 US2006245923 A1 US 2006245923A1
Authority
US
United States
Prior art keywords
nozzle
stainless steel
segment
segments
reaction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/115,371
Other languages
English (en)
Inventor
David Fitts
Robert BRACKEN
Sterling Hathaway
Ronald Korzun
Larry Duclos
William Adis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US11/115,371 priority Critical patent/US20060245923A1/en
Assigned to GENERAL ELECTRIC COMPANY reassignment GENERAL ELECTRIC COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ADIS, WILLIAM EDWARD, DUCLOS, LARRY, HATHAWAY, STERLING R., KORZUN, RONALD W., BRACKEN, ROBERT JAMES, FITTS, DAVID ORUS
Priority to EP06252184A priority patent/EP1722070A3/en
Priority to RU2006114341/06A priority patent/RU2006114341A/ru
Priority to CN2006100771495A priority patent/CN1880731B/zh
Publication of US20060245923A1 publication Critical patent/US20060245923A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector

Definitions

  • This invention relates to a method of producing steam turbine components and, specifically, dovetailed reaction nozzle segments.
  • a plurality of nozzles are manufactured by machining from a single piece of flat plate stock.
  • a single solid donut-shaped ring is cut from flat plate stock and then cut into two 180° segments.
  • the cut ends of the segments may then be configured for temporary attachment to a machining jig or the like, or the segments may be temporarily joined together (by, e.g., bolts) on a jig and subsequently machined to include integral shroud covers, airfoils and dovetails.
  • the two 180° segments are loaded into the nozzle carrier or casing dovetail in the usual manner.
  • four 90° segments may be cut from the solid ring and subsequently machined to each include 25% of the required nozzles.
  • arcuately shorter segments may be machined to include as few as two integral nozzle airfoils, thus still reducing the nozzle components by half.
  • the invention relates to a method of manufacturing reaction nozzles for a turbine comprising (a) providing a piece of flat plate stock of predetermined size and thickness; and (b) machining the piece of flat plate stock to form a unitary, arcuate reaction nozzle segment including at least two adjacent nozzle airfoils.
  • the invention in another aspect, relates to a method of manufacturing reaction nozzles for a turbine comprising (a) providing a single piece of flat plate stock of predetermined size and thickness; and (b) cutting the flat plate stock to form a 360° ring; (c) cutting the 360° ring into two or more arcuate segments; and (d) machining each of the segments to include a plurality of nozzle airfoils.
  • the invention relates to a reaction nozzle component for a steam turbine comprising a unitary arcuate segment formed to include a plurality of adjacent nozzle airfoils.
  • FIG. 1 is a perspective view of a known steam turbine reaction nozzle
  • FIG. 2 is a perspective view of a unitary arcuate reaction nozzle segment in accordance with an exemplary embodiment of this invention
  • FIG. 3 is a plan view of a piece of flat plate stock marked for cutting a 360° ring from the stock;
  • FIG. 4 is a plan view of the ring removed from the plate stock of FIG. 3 and cut to form two 180° arcuate segments;
  • FIG. 5 is an exploded view of the two 180° arcuate segments of FIG. 4 modified for temporary attachment to a jig or to each other for machining;
  • FIG. 6 is a plan view of a solid ring cut into four 90° segments for subsequent machining in accordance with another embodiment of the invention.
  • a conventional steam turbine reaction nozzle 10 includes an airfoil 12 and an integral radially inner tip shroud or cover 14 .
  • the radially outer end of the nozzle is formed with a base 16 having a dovetail configuration.
  • the base or dovetail 16 is provided with a pair of flanges 18 and 20 projecting in both axially upstream and downstream directions, defining recesses 22 therebetween.
  • the nozzle casing or carrier (not shown) is provided with generally correspondingly shaped dovetail grooves which allow the nozzles 10 to be individually loaded into the carrier or casing at a conventional notched cut-out.
  • each nozzle can be loaded into the dovetail slot in the carrier until the entire row of nozzles has been assembled.
  • the dovetail arrangement may be reversed, with the dovetail groove component formed in the nozzle and the dovetail hook component formed on the carrier or casing.
  • FIG. 2 illustrates a unitary arcuate dovetail reaction nozzle component or segment manufactured in accordance with an exemplary embodiment of the invention.
  • the segment 24 is machined from a single piece of flat metal plate stock and includes a plurality of adjacent airfoil portions (or simply “airfoils”) 26 with an integral, common tip shroud or cover 28 at the radially inner ends of the airfoils, and an integral, common dovetail hook 30 at the radially inner ends of the airfoils.
  • the arcuate length of the segments may be varied as desired to include as few as two airfoils or as many as 50% of the airfoils required for a full 360° reaction nozzle ring.
  • the common dovetail comprises a centerline support mechanism for a 180° segment.
  • a donut-shaped ring 36 is initially cut from a single piece of flat plate stock 38 , using any conventional cutting technique, for example, wire electrical discharge machining (EDM).
  • EDM wire electrical discharge machining
  • the ring 36 is cut into two 180° segments 40 and 42 , again using conventional cutting processes.
  • the separated segments 40 and 42 may be provided with any suitable end flanges as shown at 44 , 46 that permit the segments to be bolted to a machining jig in alignment with each other, similar to their alignment when assembled in upper and lower carrier or casing components.
  • the segments 38 , 40 may be temporarily bolted together and otherwise secured to the jig for machining.
  • the segments 38 and 40 are then machined to include the airfoils 26 , integral tip shrouds or tip covers 28 , and dovetail hooks 30 as shown in FIG. 2 , but noting that FIG. 2 illustrates an arcuately shorter segment. After machining, the segments 38 and 40 are disassembled or removed from the jig and are ready for insertion into the carrier or casing dovetail groove.
  • a solid ring 48 may be cut from the flat plate stock into four individual 90° segments 50 , 52 , 54 and 56 and machined to each include 25% of the required airfoils.
  • the arcuate length of the airfoil segments may be altered as desired with each segment including at least two airfoils.
  • the flat plate stock 38 may be high grade 400 Series stainless steel with 12% chromium, or other suitable material.
  • shims of appropriate thickness may be placed between the segments at the dovetail.
  • the segments may be held in place in the dovetail via conventional radial end or axial shims which eliminate the radial end or axial gap between the segment dovetail and the dovetail groove in the casing or carrier.
  • machined segment concept in accordance with this invention also improves the ability to service/repair rows relative to current practice; creates a known/repeatable/unvarying boundary condition; reduces the number of parts per stage; and insures that segments are assembled in the correct location/direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US11/115,371 2005-04-27 2005-04-27 Arcuate nozzle segment and related method of manufacture Abandoned US20060245923A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US11/115,371 US20060245923A1 (en) 2005-04-27 2005-04-27 Arcuate nozzle segment and related method of manufacture
EP06252184A EP1722070A3 (en) 2005-04-27 2006-04-22 Method of manufacturing segmented stators for a steam turbine
RU2006114341/06A RU2006114341A (ru) 2005-04-27 2006-04-26 Способ изготовления реактивной направляющей лопатки для турбины (варианты)
CN2006100771495A CN1880731B (zh) 2005-04-27 2006-04-27 弧形喷嘴部分和相关的制造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/115,371 US20060245923A1 (en) 2005-04-27 2005-04-27 Arcuate nozzle segment and related method of manufacture

Publications (1)

Publication Number Publication Date
US20060245923A1 true US20060245923A1 (en) 2006-11-02

Family

ID=36994715

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/115,371 Abandoned US20060245923A1 (en) 2005-04-27 2005-04-27 Arcuate nozzle segment and related method of manufacture

Country Status (4)

Country Link
US (1) US20060245923A1 (zh)
EP (1) EP1722070A3 (zh)
CN (1) CN1880731B (zh)
RU (1) RU2006114341A (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070071605A1 (en) * 2005-09-23 2007-03-29 General Electric Company Integrated nozzle and bucket wheels for reaction steam turbine stationary components and related method
US20140147262A1 (en) * 2012-11-27 2014-05-29 Techspace Aero S.A. Axial Turbomachine Stator with Segmented Inner Shell
EP3967846A1 (en) 2020-09-10 2022-03-16 General Electric Company Nozzle segment, steam turbine with diaphragm of multiple nozzle segments and method for assembly thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070053773A1 (en) * 2005-09-07 2007-03-08 General Electric Company Integrated nozzle wheel for reaction steam turbine stationary components and related method

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056583A (en) * 1960-11-10 1962-10-02 Gen Electric Retaining means for turbine shrouds and nozzle diaphragms of turbine engines
US3091383A (en) * 1957-02-14 1963-05-28 Stalker Corp Bladed rotor for fluid machines
US3302926A (en) * 1965-12-06 1967-02-07 Gen Electric Segmented nozzle diaphragm for high temperature turbine
US5082623A (en) * 1989-06-01 1992-01-21 Abb Stal Ab Method of manufacturing a split circular ring
US5573374A (en) * 1993-11-17 1996-11-12 Giberson; Melbourne F. Monolithic shrouded impeller
US6183192B1 (en) * 1999-03-22 2001-02-06 General Electric Company Durable turbine nozzle
US6425738B1 (en) * 2000-05-11 2002-07-30 General Electric Company Accordion nozzle
US6676344B1 (en) * 1999-09-21 2004-01-13 Rolls Royce Plc Methods and apparatus for machining workpieces
US20040064945A1 (en) * 2001-12-27 2004-04-08 Todd Howley Method of forming turbine blade root
US6722848B1 (en) * 2002-10-31 2004-04-20 General Electric Company Turbine nozzle retention apparatus at the carrier horizontal joint face
US20060026832A1 (en) * 2004-08-03 2006-02-09 Snecma Method for manufacturing constituents of a hollow blade by rolling
US20070071605A1 (en) * 2005-09-23 2007-03-29 General Electric Company Integrated nozzle and bucket wheels for reaction steam turbine stationary components and related method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174715A (en) * 1990-12-13 1992-12-29 General Electric Company Turbine nozzle
JP4040922B2 (ja) * 2001-07-19 2008-01-30 株式会社東芝 組立式ノズルダイアフラムおよびその組立方法
US20070053773A1 (en) * 2005-09-07 2007-03-08 General Electric Company Integrated nozzle wheel for reaction steam turbine stationary components and related method
US7497658B2 (en) * 2005-11-11 2009-03-03 General Electric Company Stacked reaction steam turbine stator assembly

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091383A (en) * 1957-02-14 1963-05-28 Stalker Corp Bladed rotor for fluid machines
US3056583A (en) * 1960-11-10 1962-10-02 Gen Electric Retaining means for turbine shrouds and nozzle diaphragms of turbine engines
US3302926A (en) * 1965-12-06 1967-02-07 Gen Electric Segmented nozzle diaphragm for high temperature turbine
US5082623A (en) * 1989-06-01 1992-01-21 Abb Stal Ab Method of manufacturing a split circular ring
US5573374A (en) * 1993-11-17 1996-11-12 Giberson; Melbourne F. Monolithic shrouded impeller
US6183192B1 (en) * 1999-03-22 2001-02-06 General Electric Company Durable turbine nozzle
US6676344B1 (en) * 1999-09-21 2004-01-13 Rolls Royce Plc Methods and apparatus for machining workpieces
US6425738B1 (en) * 2000-05-11 2002-07-30 General Electric Company Accordion nozzle
US20040064945A1 (en) * 2001-12-27 2004-04-08 Todd Howley Method of forming turbine blade root
US6722848B1 (en) * 2002-10-31 2004-04-20 General Electric Company Turbine nozzle retention apparatus at the carrier horizontal joint face
US20060026832A1 (en) * 2004-08-03 2006-02-09 Snecma Method for manufacturing constituents of a hollow blade by rolling
US20070071605A1 (en) * 2005-09-23 2007-03-29 General Electric Company Integrated nozzle and bucket wheels for reaction steam turbine stationary components and related method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070071605A1 (en) * 2005-09-23 2007-03-29 General Electric Company Integrated nozzle and bucket wheels for reaction steam turbine stationary components and related method
US20140147262A1 (en) * 2012-11-27 2014-05-29 Techspace Aero S.A. Axial Turbomachine Stator with Segmented Inner Shell
EP3967846A1 (en) 2020-09-10 2022-03-16 General Electric Company Nozzle segment, steam turbine with diaphragm of multiple nozzle segments and method for assembly thereof

Also Published As

Publication number Publication date
EP1722070A3 (en) 2011-10-12
CN1880731B (zh) 2010-05-12
EP1722070A2 (en) 2006-11-15
RU2006114341A (ru) 2007-11-10
CN1880731A (zh) 2006-12-20

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AS Assignment

Owner name: GENERAL ELECTRIC COMPANY, NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FITTS, DAVID ORUS;BRACKEN, ROBERT JAMES;HATHAWAY, STERLING R.;AND OTHERS;REEL/FRAME:016511/0844;SIGNING DATES FROM 20050407 TO 20050422

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION