EP2672067A1 - Turbine rotor and blade assembly with blind holes and corresponding steam turbine - Google Patents

Turbine rotor and blade assembly with blind holes and corresponding steam turbine Download PDF

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Publication number
EP2672067A1
EP2672067A1 EP13170089.0A EP13170089A EP2672067A1 EP 2672067 A1 EP2672067 A1 EP 2672067A1 EP 13170089 A EP13170089 A EP 13170089A EP 2672067 A1 EP2672067 A1 EP 2672067A1
Authority
EP
European Patent Office
Prior art keywords
blade
rotor
locking
turbine rotor
turbine
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.)
Withdrawn
Application number
EP13170089.0A
Other languages
German (de)
English (en)
French (fr)
Inventor
Thomas Joseph Farineau
Nicholas Andrew Tisenchek
Mehmet Dede
James Royce Howes
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
Publication of EP2672067A1 publication Critical patent/EP2672067A1/en
Withdrawn legal-status Critical Current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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3023—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses
    • F01D5/303—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses in a circumferential slot
    • F01D5/3038—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses in a circumferential slot the slot having inwardly directed abutment faces on both sides
    • 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/326—Locking of axial insertion type blades by other means
    • 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3023—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses
    • 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3023—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses
    • F01D5/303—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses in a circumferential slot
    • 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/94—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF]
    • F05D2260/941—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF] particularly aimed at mechanical or thermal stress reduction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/01—Purpose of the control system
    • F05D2270/11—Purpose of the control system to prolong engine life
    • F05D2270/114—Purpose of the control system to prolong engine life by limiting mechanical stresses

Definitions

  • the present application and the resultant patent relate generally to turbo-machinery and more particularly relate to a turbine rotor and blade assembly for use with a steam turbine having redundant locking blade retention screw holes for reduced tangential stress.
  • Steam turbine airfoils or buckets generally are positioned about a rotor at regular intervals in a bucket assembly.
  • the bucket assembly may be created by inserting the buckets one at a time tangentially into an opening on the rotor and then sliding the buckets circumferentially about the rotor.
  • the buckets may be attached to the rotor by complementary male and female dovetails and other configurations. In order to close the bucket assembly, however, the last bucket must be restrained by a feature other than a dovetail.
  • This last bucket generally called the locking blade or the closure bucket, may be affixed to the rotor via one or more blade retention screws and the like tapped or screwed into the rotor. Other types of connection means and other types of bucket assemblies also may be used.
  • centrifugal loads may be placed on the buckets and the rotor during operation.
  • Such centrifugal loads and coincident thermally induced loads associated with loading transients may induce stresses in the dovetails and adjacent areas that attach the buckets to the rotor. These stresses may be of sufficient magnitude to impact adversely rotor cycle fatigue life.
  • rotor stress concentrations associated with blade retention screws may be tapped or otherwise inserted directly into the rotor.
  • an improved turbine rotor and blade assembly for a steam turbine and the like.
  • an improved turbine rotor and blade assembly may reduce tangential thermal stresses therein for an improved overall rotor fatigue life.
  • the present application and the resultant patent thus provide a turbine rotor and blade assembly for a steam turbine.
  • the turbine rotor and blade assembly may include a rotor, a number of buckets positioned about the rotor, a locking blade positioned about the rotor, and a blind hole positioned about the rotor adjacent to the locking blade.
  • the present application and the resultant patent further provide a turbine rotor and blade assembly for a steam turbine.
  • the turbine rotor and blade assembly described herein may include a rotor, a number of buckets positioned about the rotor, a locking blade positioned about the rotor, a locking blade retention screw securing the locking blade to the rotor, and a blind hole positioned about the rotor adjacent to the locking blade.
  • the present application and the resultant patent further provide a steam turbine.
  • the steam turbine described herein may include a rotor, a number of buckets positioned about the rotor, a locking blade positioned about the rotor, a locking blade retention hole positioned about the locking blade, a locking blade retention screw positioned in the locking blade retention hole so as to secure the locking blade to the rotor, and one or more blind holes positioned about the rotor adjacent to the locking blade.
  • Fig. 1 is a schematic diagram of an example of a steam turbine 10 as may be used herein.
  • the steam turbine 10 may include a first section 15 and a second section 20.
  • the sections 15, 20 may be high pressure sections, intermediate pressure sections, and/or low pressure sections. Each of the sections 15, 20 may have a number of stages therein.
  • An outer shell or casing 25 may be divided axially into upper and lower half sections 30, 35, respectively.
  • a rotor shaft 40 may extend through the casing 25 and may be supported by a number of journal bearings 45.
  • a number of seals 50 also may surround the rotor shaft 40 about the ends and elsewhere.
  • a central section 55 may include one or more steam inlets 60.
  • a flow splitter 65 may extend between the sections 15, 20.
  • a flow of steam 70 passes through the steam inlets 60 and into the sections 15, 20 such that mechanical work may be extracted from the steam by the stages therein so as to rotate the rotor shaft 40.
  • the flow of steam 70 then may exit the sections 15, 20 for further processing and the like.
  • the steam turbine 10 described herein is for the purpose of example only. Steam turbines and/or other types of turbo-machinery in many other configurations and with many other or different components also may be used herein.
  • Fig. 2 shows a portion of a steam turbine 100 as may be described herein.
  • the steam turbine 100 may include a turbine rotor and blade assembly 110.
  • the turbine rotor and blade assembly 110 includes a turbine rotor 120.
  • the turbine rotor 120 includes a dovetail slot 130 formed therein.
  • a number of buckets 140 may be mounted on the rotor 120 via tangential entry and the like.
  • Each of the buckets 140 may include a blade 150 and a dovetail 160.
  • the dovetail 160 may be configured to mate with the conforming dovetail slot 130 (or vice versa) of the rotor 120.
  • the rotor 120 and the buckets 140 may have any size, shape, or configuration. Other components and other configurations may be used herein.
  • the turbine rotor and blade assembly 110 also may include a locking blade 170.
  • the locking blade 170 lacks the dovetail 160. Rather, a base 180 of the locking blade 170 may be retained within the rotor 120 via a number of blade retention screws 190 and the like.
  • the blade retention screws 190 may be grub screws or other types of set screws and the like with or without a head on one end. Each blade retention screw 190 may be positioned in a blade retention hole 200.
  • the blade retention hole 200 may extend into the rotor 120 adjacent to the locking blade 170 as well as into the base 180 of the locking blade 170 so as to retain the locking blade 170 therein. Any number of the blade retention screws 190 may be used.
  • the respective components described herein may have any size, shape, or configuration. Other components and other configurations also may be used herein.
  • the turbine rotor and blade assembly 110 therefore may have a number of blind holes 210 formed therein.
  • the blind holes 210 may be positioned in the rotor 120 on either or both sides of the blade retention hole 200.
  • the blind holes 210 may be placed about the locking blade 170 on both axial and radial sides thereof.
  • the blind holes 210 may have a similar size, shape, and configuration as compared to the blade retention holes 200.
  • the blind holes 210 also may have any size, shape, or configuration.
  • Blind holes 210 of differing sizes, shapes, or configurations also may be used herein together. Any number of the blind holes 210 may be used herein.
  • the blind holes 210 thus may improve the fatigue life of the turbine rotor and blade assembly 110 by "shielding" the blade retention holes 200 from local stress fields and the like.
  • the blind holes 210 may straddle the blade retention holes 200 tangentially so as to protect the blade retention holes 200 from potentially damaging tangential stresses.
  • the blind holes 200 thus may improve the fatigue life of the rotor 120 and related components for an extended component lifetime.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP13170089.0A 2012-06-06 2013-05-31 Turbine rotor and blade assembly with blind holes and corresponding steam turbine Withdrawn EP2672067A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/489,495 US20130330198A1 (en) 2012-06-06 2012-06-06 Turbine Rotor and Blade Assembly with Blind Holes

Publications (1)

Publication Number Publication Date
EP2672067A1 true EP2672067A1 (en) 2013-12-11

Family

ID=48539004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13170089.0A Withdrawn EP2672067A1 (en) 2012-06-06 2013-05-31 Turbine rotor and blade assembly with blind holes and corresponding steam turbine

Country Status (5)

Country Link
US (1) US20130330198A1 (ru)
EP (1) EP2672067A1 (ru)
JP (1) JP2013253597A (ru)
CN (1) CN103470307A (ru)
RU (1) RU2013125740A (ru)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9366146B2 (en) * 2013-06-11 2016-06-14 General Electric Company Closure bucket for turbo-machine
US9988918B2 (en) 2015-05-01 2018-06-05 General Electric Company Compressor system and airfoil assembly
US10465537B2 (en) 2016-05-27 2019-11-05 General Electric Company Margin bucket dovetail radial support feature for axial entry buckets
US11555407B2 (en) 2020-05-19 2023-01-17 General Electric Company Turbomachine rotor assembly
KR102360823B1 (ko) * 2020-09-01 2022-02-08 재단법인대구경북과학기술원 직렬 탄성 액추에이터

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB122455A (en) * 1918-01-21 1919-01-21 Charles Algernon Parsons Turbine Blade Attachments.
US1829881A (en) * 1930-04-05 1931-11-03 Allis Chalmers Mfg Co Turbine blade mounting
DE1197095B (de) * 1959-07-10 1965-07-22 Siemens Ag Schaufelschloss
WO2013102591A1 (de) * 2012-01-03 2013-07-11 Siemens Aktiengesellschaft Befestigung einer schlossschaufel an einer rotoreinheit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL64087C (ru) * 1946-05-04 1900-01-01
GB854548A (en) * 1958-07-25 1960-11-23 Westinghouse Electric Corp Improvements in or relating to bladed rotors, for example of turbines
US7270512B2 (en) * 2005-08-24 2007-09-18 General Electric Company Stacked steampath and grooved bucket wheels for steam turbines
US7901187B2 (en) * 2006-06-23 2011-03-08 Siemens Energy, Inc. Turbine rotor blade groove entry slot lock structure
GB2442968B (en) * 2006-10-20 2009-08-19 Rolls Royce Plc A turbomachine rotor blade and a turbomachine rotor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB122455A (en) * 1918-01-21 1919-01-21 Charles Algernon Parsons Turbine Blade Attachments.
US1829881A (en) * 1930-04-05 1931-11-03 Allis Chalmers Mfg Co Turbine blade mounting
DE1197095B (de) * 1959-07-10 1965-07-22 Siemens Ag Schaufelschloss
WO2013102591A1 (de) * 2012-01-03 2013-07-11 Siemens Aktiengesellschaft Befestigung einer schlossschaufel an einer rotoreinheit

Also Published As

Publication number Publication date
RU2013125740A (ru) 2014-12-10
US20130330198A1 (en) 2013-12-12
JP2013253597A (ja) 2013-12-19
CN103470307A (zh) 2013-12-25

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