EP0156619B1 - Blade ring for a steam turbine - Google Patents

Blade ring for a steam turbine Download PDF

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Publication number
EP0156619B1
EP0156619B1 EP85301915A EP85301915A EP0156619B1 EP 0156619 B1 EP0156619 B1 EP 0156619B1 EP 85301915 A EP85301915 A EP 85301915A EP 85301915 A EP85301915 A EP 85301915A EP 0156619 B1 EP0156619 B1 EP 0156619B1
Authority
EP
European Patent Office
Prior art keywords
casing
blade ring
disposed
inner casing
steam
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.)
Expired
Application number
EP85301915A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0156619A1 (en
Inventor
Lewis J. Miller
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of EP0156619A1 publication Critical patent/EP0156619A1/en
Application granted granted Critical
Publication of EP0156619B1 publication Critical patent/EP0156619B1/en
Expired 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
    • F01D5/12—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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/246—Fastening of diaphragms or stator-rings
    • 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/26—Double casings; Measures against temperature strain in casings

Definitions

  • This invention relates to steam turbines and in particularto steam turbines with inner casings and blade rings.
  • High pressure steam turbines are built with an outer casing, an inner casing disposed within the outer casing and supported from the outer casing, and blade rings supported within the inner casing.
  • An inner casing is provided to better accommodate the high pressures and temperature of the inlet steam which are especially high near the inlet axial end of the steam expansion path.
  • Such intermediate inner casing greatly reduces the stresses to which the turbine casing is exposed, it does require a substantial amount of space necessitating a larger-diameter outer casing and therefore is relatively expensive.
  • the blade ring structure is generally diverging in steam flow direction to provide an increasing steam flow passage as the steam is expanding during its flow through the turbine.
  • the expansion stages and in accordance therewith the blade ring structures are relatively long and therefore of substantial outer diameter at their downstream ends and as a result the inner casings in which the blade ring structures are generally supported and also, of course the outer casings in which the inner casings are supported need to be of relatively large diameters.
  • the present invention resides in a steam turbine comprising an outer horizontally split cylindrical casing, an inner cylindrical casing disposed within the outer casing and supported from the outer casing and a blade ring partly disposed within the inner casing and surrounding a turbine rotor, said blade ring having a lower pressure end portion projecting axially from said inner casing and a higher pressure and portion disposed within said inner casing, said axially projecting lower pressure blade ring portion being provided with integral support arms which extend radially outward to, and are directly supported on the outer casing, characterized in that said inner cylindrical casing is horizontally split and said blade ring is a divergent one and only the higher pressure end portion of said blade ring which is of a relatively small diameter is disposed in said inner casing.
  • Figures 1 and 2 are indicated as prior art and show a steam turbine 103 which is designed for the same operating temperature, pressure and steam throughput as the turbine 3 shown in Figures 3 and 4 and made in accordance with this invention.
  • Reference numerals with a 100 prefix in the prior art, Figs. 1 and 2 indicate parts similar to those indicated by the reference numeral without the prefix in Figs. 3 and 4.
  • the turbine 3 comprises a horizontally split cylindrical outer housing or casing 5 held together by bolts 7, a horizontally split cylindrical inner housing or casing 9 held together by bolting 11 and disposed within the outer casing 5 and supported from the outer casing 5 by supports 13. Disposed partially within the inner casing 9 and partially within the outer casing 5 is a longitudinally split blade ring 15 which is also held together by bolting 17. The blade ring 15 is supported on an arm 19 which extends outwardly to and is supported by the outer casing 5.
  • the blade ring 15 has a plurality of circumferential grooves 21 which receive annular arrays of stationary blades forming rows of stationary blades 23.
  • a rotor 25 having a plurality of annular arrays of rotating blades forming rows of rotating blades 27 is disposed within the blade ring 15 and the rows of rotating blades 27 interdigitate with the rows of stationary blades 23.
  • a nozzle block 29 and nozzle chamber 31 are disposed on one end of the blade ring 15 and within the inner casing 9for admitting steam to the blade path. Also disposed within the inner casing 9 is a dummy ring 33 which cooperates with an integral balance disc 35 on the rotor to balance the thrust produced by the steam acting on the rotating blades and rotor.
  • Supporting the blade ring 15 from the outer casing 5 rather than from the inner casing advantageously increases the resisting momentum acting on the blade ring thus reducing the stresses, support is moved to a lower temperature region lowering the material requirements and raising the allowable stresses; reduces inner and outer casing overall diameter, wall thickness and bolting requirements; and reduces inner casing support size as loading from the blade ring is transmitted directly to the outer casing, thus producing savings in material, manufacturing and handling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP85301915A 1984-03-23 1985-03-19 Blade ring for a steam turbine Expired EP0156619B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US59298384A 1984-03-23 1984-03-23
US592983 1984-03-23

Publications (2)

Publication Number Publication Date
EP0156619A1 EP0156619A1 (en) 1985-10-02
EP0156619B1 true EP0156619B1 (en) 1988-09-28

Family

ID=24372871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85301915A Expired EP0156619B1 (en) 1984-03-23 1985-03-19 Blade ring for a steam turbine

Country Status (6)

Country Link
EP (1) EP0156619B1 (es)
JP (1) JPS60212604A (es)
KR (1) KR930008675B1 (es)
DE (1) DE3565299D1 (es)
ES (1) ES8607476A1 (es)
IN (1) IN162366B (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4661043A (en) * 1985-10-23 1987-04-28 Westinghouse Electric Corp. Steam turbine high pressure vent and seal system
US7497658B2 (en) * 2005-11-11 2009-03-03 General Electric Company Stacked reaction steam turbine stator assembly
US7722314B2 (en) * 2006-06-22 2010-05-25 General Electric Company Methods and systems for assembling a turbine
CN204984506U (zh) * 2015-09-08 2016-01-20 阿尔斯通技术有限公司 具有模块化插入件的蒸汽涡轮
CN114458615B (zh) * 2021-12-14 2023-11-21 泸州懋威科技有限公司 一种紧凑式涡轮发动机压气机承力结构

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE724321C (de) * 1936-03-01 1942-08-24 Karl Roeder Dr Ing In mindestens einer Achsebene unterteilter, mehrere Kraenze enthaltender Leitschaufeltraeger, insbesondere fuer UEberdruck-Dampfturbinen
DE858251C (de) * 1938-03-03 1952-12-04 Karl Dr-Ing Roeder Leitschaufel- oder Dichtungstraeger, bei dem der mindestens in einer Achsebene geteilte Traeger durch Haltekoerper zusammengehalten ist
US2304994A (en) * 1941-06-20 1942-12-15 Westinghouse Electric & Mfg Co Turbine cylinder cooling
GB662371A (en) * 1948-07-17 1951-12-05 Westinghouse Electric Int Co Improvements in or relating to steam turbine apparatus
FR1157588A (fr) * 1955-09-22 1958-05-30 Bbc Brown Boveri & Cie Turbine à gaz ou à vapeur pour pressions et températures élevées
GB1024844A (en) * 1962-02-12 1966-04-06 Pametrada Improvements in or relating to steam turbines
CH426882A (de) * 1963-07-15 1966-12-31 Licentia Gmbh Axiale Zwischenüberhitzungs-Dampfturbine
AT242716B (de) * 1963-11-18 1965-10-11 Elin Union Ag Dampfturbine mit gesteuerter Dampfentnahme
DE1426826A1 (de) * 1964-02-17 1969-01-23 Licentia Gmbh Frischdampfzufuehrung bei mehrflutiger hochbeanspruchter Doppelgehaeuse-Turbine

Also Published As

Publication number Publication date
ES8607476A1 (es) 1986-05-16
IN162366B (es) 1988-05-14
ES541438A0 (es) 1986-05-16
KR850007838A (ko) 1985-12-09
JPH0373721B2 (es) 1991-11-22
DE3565299D1 (en) 1988-11-03
KR930008675B1 (ko) 1993-09-11
EP0156619A1 (en) 1985-10-02
JPS60212604A (ja) 1985-10-24

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