US3630635A - Turbine casing with raised horizontal joint - Google Patents

Turbine casing with raised horizontal joint Download PDF

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Publication number
US3630635A
US3630635A US71158A US3630635DA US3630635A US 3630635 A US3630635 A US 3630635A US 71158 A US71158 A US 71158A US 3630635D A US3630635D A US 3630635DA US 3630635 A US3630635 A US 3630635A
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United States
Prior art keywords
inner casing
horizontal
casing
centerline
joint
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Expired - Lifetime
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US71158A
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English (en)
Inventor
Arthur F Fatum
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General Electric Co
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General Electric Co
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Publication date
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Publication of US3630635A publication Critical patent/US3630635A/en
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    • 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

  • the inner casing of a low-pressure steam turbine has top and bottom sections which are connected along a horizontal joint disposed substantially higher than the horizontal centerline of the machine.
  • the connectors at the joint can thus be located outside the inner casing because of the smaller sealing surface area at the raised joint.
  • This invention relates to elastic fluid turbines and particularly to an improvement in the inner casing construction of a low-pressure steam turbine.
  • the low-pressure units of large steam turbines are often arranged so that the lowest pressure turbine sections are disposed in an inner casing which is located in an outer casing or exhaust hood leading to the condenser.
  • the space between the inner and outer casings is at a vacuum corresponding roughly to exhaust or condenser pressure, while the steam pressure inside the inner casing varies as it is expanded from one stage of buckets and nozzle diaphragms to the next.
  • Low-pressure turbines are also generally constructed to provide for extraction of steam at various points along the low-pressure turbine sections in order to supply various feedwater heaters.
  • passages within the inner casing must. be provided to lead the extracted steam from selected turbine stages and to remove it through pipes leading from the outer casing or exhaust hood.
  • These extraction passages are generally formed between longitudinally spaced radial walls and the wrapper walls of the inner casing.
  • the inner casing must be split into two or more sections to allow for removal of the stationary nozzle diaphragms separating the turbine stages, and also for removal of the rotor itself.
  • the inner casing upper and lower sections have been divided along a horizontal joint which is located roughly at the horizontal centerline of the machine, and the upper and lower halves of the nozzle diaphragms have also been supported substantially at the horizontal centerline. Because of the fact that the space between the outer casing and inner casing is at a vacuum, a tight seal must be maintained at this horizontal joint between the upper and lower inner casing halves.
  • one object of the present invention is to provide an improved inner casing construction for a low-pressure steam turbine, wherein the connecting means for sealing the upper and lower inner casing halves may all be disposed on the outside of the inner casing.
  • Another object of the invention is to provide an improved inner casing construction for a low-pressure steam turbine, wherein the connecting means for joining the casing halves is arranged to minimize obstructions in the steam flow paths.
  • the invention is practiced by locating the horizontal joint of the inner casing substantially above the turbine horizontal centerline and at a location of smaller sealing area around the extraction passages, and locating the connecting members on the outside of the inner casing.
  • FIG. la is a transverse cross section through one-half of a low-pressure steam turbine illustrating the prior art
  • FIG. lb is a similar cross section through the other half and illustrating the present invention.
  • FIG. 2 is a horizontal cross section taken along lines Il-lI of FIG. la illustrating the prior art
  • FIG. 3 is a horizontal cross section taken along lines IllIlI of FIG. lb, illustrating the invention.
  • an outer casing l which in this case is the exhaust hood, is arranged in upper and lower halves connected at a horizontal joint 2 and supported on a foundation 3. At its lower end, the outer casing l communicates with the condenser (not shown). Disposed inside the outer casing is an inner casing 4 comprising an upper section 40 and a lower section 4b. Sections 40 and 4b are connected along a horizontal joint 5 disposed substantially along the horizontal centerline 6 of the turbine rotor (not shown). Joint 5 is sealed by external connecting bolts 7 and internal connecting bolts 8. Access to internal bolts 8 is provided by a removable cover 9.
  • Extraction passages 16 are formed inside the inner casing 4 by an outer wrapper wall 17 and a number of spaced dial dividing walls 18. The wrapper and radial walls are arranged so that the cross-sectional flow area of extraction passages 16 increase gradually from the top of the inner casing around the unit until they finally empty into an extraction steam removal pipe 19 toward the lower part of the inner casing.
  • FIG. 2 of the drawing which also illustrates the prior art, shows a horizontal cross section of a portion of the turbine, looking downward just above the horizontal joint.
  • the configuration of the wall sections of the inner casing 4 is rather complex in order to provide the various extraction passages such as 16, as well as to accommodate the varying sizes of the outer diaphragm rings such as I2, 12a and 12b along the steam flow path.
  • additional radial wall portions 18a, 18b are longitudinally spaced along the unit, these being joined to additional circumferential well portions 17a, 17b which in turn cooperate with the outer diaphragm rings. These members together seal off regions of fluid pressure leading into extraction conduit 16.
  • FIGS. lb and 3 relate to the improved construction of the present invention.
  • the outer casing l is arranged as before, as are the members 10, I1 and 12 making up the diaphragm.
  • the improvement of the present invention relates to the inner casing shown as 21, constructed with a top section 21a and a bottom section 21b.
  • a wrapper wall 22 and a group of radial wall portions 23, together with the diaphragm outer rings 12 define, as before, extraction passages 24. Passages 24 gradually increase in cross-sectional area from the top toward the lower part of casing 21 and are led from the casing through extraction pipes 25.
  • the upper and lower casing sections are connected at a horizontaljoint 26.
  • Joint 26 is disposed substantially higher than the centerline 6 of the unit, perhaps on the order of 2 feet in a large lowpressure turbine. Since the radius of the inner casing will vary from 4 feet to 8 feet or more, the joint is thus raised on the order of onequarter to one-half of the inner casing radius.
  • Mounting pads 27 arranged on selected radial walls 23 support the diaphragm lugs 13 substantially at the horizontal centerline as before, and removable square-headed pins 28 hold the lugs 13 in position.
  • Means for connecting the upper and lower sections at horizontal joint 26 include bolts 28. These bolts are all located and accessible from the outside of inner casing 21.
  • FIG. 3 shows the inner casing to include additional diaphragm rings 12, 12b and additional radial wall portions 23a, 23b as before, together defining extraction passages such as 24. Passages 24 become smaller in cross-sectional area as the top of the inner casing is approached. Hence the total area for sealing the raised horizontal joint is substantially smaller than in FIG. 2 for a comparable unit and the lengths of the radial walls are also shorter. This enables a sufficient seal at the joint to be obtained by the use of bolts 28 which are all external to the inner casing. Sealing keys 29 at the horizontal joint may be employed if desired to give additional sealing capability.
  • an elastic fluid turbine having a rotor with a plurality of bucket wheels and a plurality of stationary nozzle diaphragms separating said wheels and having outer ring portions dividing regions of gradually decreasing fluid pressure, the improvement comprising:
  • an inner casing disposed thin said outer casing and having a wrapper wall and a plurality of spaced radial wall portions, said wall portions and said outer diaphragm ring portions cooperating to define extraction conduits from said diaphragm pressure regions, said conduits gradually increasing in cross-sectional area from the top of the inner casing to the horizontal centerline of the rotor,
  • said inner casing being divided into upper and lower sections along a horizontal joint disposed substantially higher than said centerline, whereby the sealing surface at the joint is smaller than it would be if located at the centerline, and

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US71158A 1970-09-10 1970-09-10 Turbine casing with raised horizontal joint Expired - Lifetime US3630635A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7115870A 1970-09-10 1970-09-10

Publications (1)

Publication Number Publication Date
US3630635A true US3630635A (en) 1971-12-28

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Application Number Title Priority Date Filing Date
US71158A Expired - Lifetime US3630635A (en) 1970-09-10 1970-09-10 Turbine casing with raised horizontal joint

Country Status (7)

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US (1) US3630635A (de)
JP (1) JPS5420602B1 (de)
CH (1) CH528667A (de)
DE (1) DE2142845C3 (de)
FR (1) FR2107400A5 (de)
GB (1) GB1336384A (de)
SE (1) SE360426B (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752427A (en) * 1971-03-11 1973-08-14 Bbc Brown Boveri & Cie Support arrangement for a turbomachine
US4397608A (en) * 1980-05-01 1983-08-09 Automation Industries, Inc. Energy-absorbing turbine missile shield
US4699566A (en) * 1984-03-23 1987-10-13 Westinghouse Electric Corp. Blade ring for a steam turbine
US4744726A (en) * 1985-06-27 1988-05-17 Kraftwerk Union Aktiengesellschaft Turboset with at least one low-pressure turbine stage having an outer housing and an inner housing coaxial thereto, and with high-pressure and/or medium-pressure turbine stage
US6267556B1 (en) * 1998-04-21 2001-07-31 Kabushiki Kaisha Toshiba Steam turbine
US6419448B1 (en) * 2000-03-20 2002-07-16 Jerzy A. Owczarek Flow by-pass system for use in steam turbine exhaust hoods
US20050063821A1 (en) * 2003-09-22 2005-03-24 Luniewski Alexander Kenneth Low pressure steam turbine exhaust hood
US20080286099A1 (en) * 2007-05-17 2008-11-20 General Electric Company Steam turbine exhaust hood and method of fabricating the same
US20100202879A1 (en) * 2009-02-10 2010-08-12 General Electric Company Extraction unit for turbine and related method
US20100303620A1 (en) * 2009-05-28 2010-12-02 General Electric Company Corrugated hood for low pressure steam turbine
US20100303619A1 (en) * 2009-05-28 2010-12-02 General Electric Company Shaped and stiffened lower exhaust hood sidewalls
US20120121391A1 (en) * 2010-11-16 2012-05-17 General Electric Company Adjustment and measurement system for steam turbine nozzle assembly
US20120183397A1 (en) * 2011-01-14 2012-07-19 Hitachi, Ltd. Exhaust System for Steam Turbine
CN103362576A (zh) * 2013-07-30 2013-10-23 东方电气集团东方汽轮机有限公司 一种汽缸中分面密封方法
US20130315721A1 (en) * 2012-05-22 2013-11-28 Laquinnia Lawson, Jr. Exhaust Plenum for Gas Turbine
US20140119886A1 (en) * 2012-10-31 2014-05-01 General Electric Company Turbine cowling system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2551473A1 (de) * 2011-07-27 2013-01-30 Alstom Technology Ltd Vorrichtung zur gegenseitigen Fixierung von zwei Gehäusebauteilen einer Gasturbine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2199595A (en) * 1939-05-11 1940-05-07 Murray Iron Works Company Turbine
DE707153C (de) * 1938-09-02 1941-06-14 Aeg Einrichtung zur Wasserabscheidung aus teilweise entspanntem Arbeitsdampf von Dampfturinen
US2282894A (en) * 1940-04-02 1942-05-12 Gen Electric Elastic fluid turbine
US2683017A (en) * 1949-04-27 1954-07-06 Westinghouse Electric Corp Turbine cylinder joint
US2975600A (en) * 1958-03-17 1961-03-21 Allis Chalmers Mfg Co Steam turbine installation
FR1301686A (fr) * 1960-09-28 1962-08-17 Licentia Gmbh Turbine à gaz ou à vapeur du type axial à plusieurs étages
US3058720A (en) * 1960-11-10 1962-10-16 Westinghouse Electric Corp Moisture removing apparatus for steam turbine or the like
US3520634A (en) * 1966-12-02 1970-07-14 Bbc Brown Boveri & Cie Exhaust steam housing for low pressure steam turbines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE707153C (de) * 1938-09-02 1941-06-14 Aeg Einrichtung zur Wasserabscheidung aus teilweise entspanntem Arbeitsdampf von Dampfturinen
US2199595A (en) * 1939-05-11 1940-05-07 Murray Iron Works Company Turbine
US2282894A (en) * 1940-04-02 1942-05-12 Gen Electric Elastic fluid turbine
US2683017A (en) * 1949-04-27 1954-07-06 Westinghouse Electric Corp Turbine cylinder joint
US2975600A (en) * 1958-03-17 1961-03-21 Allis Chalmers Mfg Co Steam turbine installation
FR1301686A (fr) * 1960-09-28 1962-08-17 Licentia Gmbh Turbine à gaz ou à vapeur du type axial à plusieurs étages
US3058720A (en) * 1960-11-10 1962-10-16 Westinghouse Electric Corp Moisture removing apparatus for steam turbine or the like
US3520634A (en) * 1966-12-02 1970-07-14 Bbc Brown Boveri & Cie Exhaust steam housing for low pressure steam turbines

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752427A (en) * 1971-03-11 1973-08-14 Bbc Brown Boveri & Cie Support arrangement for a turbomachine
US4397608A (en) * 1980-05-01 1983-08-09 Automation Industries, Inc. Energy-absorbing turbine missile shield
US4699566A (en) * 1984-03-23 1987-10-13 Westinghouse Electric Corp. Blade ring for a steam turbine
US4744726A (en) * 1985-06-27 1988-05-17 Kraftwerk Union Aktiengesellschaft Turboset with at least one low-pressure turbine stage having an outer housing and an inner housing coaxial thereto, and with high-pressure and/or medium-pressure turbine stage
US6443695B2 (en) 1998-04-21 2002-09-03 Kabushiki Kaisha Toshiba Steam turbine
US6267556B1 (en) * 1998-04-21 2001-07-31 Kabushiki Kaisha Toshiba Steam turbine
US6702551B2 (en) 1998-04-21 2004-03-09 Kabushiki Kaisha Toshiba Steam turbine
US6419448B1 (en) * 2000-03-20 2002-07-16 Jerzy A. Owczarek Flow by-pass system for use in steam turbine exhaust hoods
US20050063821A1 (en) * 2003-09-22 2005-03-24 Luniewski Alexander Kenneth Low pressure steam turbine exhaust hood
US6971842B2 (en) * 2003-09-22 2005-12-06 General Electric Company Low pressure steam turbine exhaust hood
US20080286099A1 (en) * 2007-05-17 2008-11-20 General Electric Company Steam turbine exhaust hood and method of fabricating the same
US7785068B2 (en) 2007-05-17 2010-08-31 General Electric Company Steam turbine exhaust hood and method of fabricating the same
US20100202879A1 (en) * 2009-02-10 2010-08-12 General Electric Company Extraction unit for turbine and related method
US8398367B2 (en) * 2009-02-10 2013-03-19 General Electric Company Extraction unit for turbine and related method
US20100303619A1 (en) * 2009-05-28 2010-12-02 General Electric Company Shaped and stiffened lower exhaust hood sidewalls
US8221053B2 (en) * 2009-05-28 2012-07-17 General Electric Company Shaped and stiffened lower exhaust hood sidewalls
US8221054B2 (en) * 2009-05-28 2012-07-17 General Electric Company Corrugated hood for low pressure steam turbine
US20100303620A1 (en) * 2009-05-28 2010-12-02 General Electric Company Corrugated hood for low pressure steam turbine
DE102011055378B4 (de) 2010-11-16 2024-08-08 General Electric Technology Gmbh Einstell- und Messsystem für Dampfturbinendüsenanordnung
US20120121391A1 (en) * 2010-11-16 2012-05-17 General Electric Company Adjustment and measurement system for steam turbine nozzle assembly
US8690533B2 (en) * 2010-11-16 2014-04-08 General Electric Company Adjustment and measurement system for steam turbine nozzle assembly
RU2601779C2 (ru) * 2010-11-16 2016-11-10 Дженерал Электрик Компани Сегмент кожуха паровой турбины, паротурбинное устройство и паротурбинная установка
US9033656B2 (en) * 2011-01-14 2015-05-19 Mitsubishi Hitachi Power Systems, Ltd. Exhaust system for steam turbine
US20120183397A1 (en) * 2011-01-14 2012-07-19 Hitachi, Ltd. Exhaust System for Steam Turbine
US20130315721A1 (en) * 2012-05-22 2013-11-28 Laquinnia Lawson, Jr. Exhaust Plenum for Gas Turbine
US8961116B2 (en) * 2012-05-22 2015-02-24 Braden Manufacturing, Llc Exhaust plenum for gas turbine
US20140119886A1 (en) * 2012-10-31 2014-05-01 General Electric Company Turbine cowling system
CN103362576A (zh) * 2013-07-30 2013-10-23 东方电气集团东方汽轮机有限公司 一种汽缸中分面密封方法

Also Published As

Publication number Publication date
DE2142845A1 (de) 1972-03-16
GB1336384A (en) 1973-11-07
CH528667A (de) 1972-09-30
FR2107400A5 (de) 1972-05-05
JPS5420602B1 (de) 1979-07-24
DE2142845B2 (de) 1977-01-27
SE360426B (de) 1973-09-24
DE2142845C3 (de) 1980-01-03

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