US3881843A - Low-pressure steam turbine casing - Google Patents
Low-pressure steam turbine casing Download PDFInfo
- Publication number
- US3881843A US3881843A US411220A US41122073A US3881843A US 3881843 A US3881843 A US 3881843A US 411220 A US411220 A US 411220A US 41122073 A US41122073 A US 41122073A US 3881843 A US3881843 A US 3881843A
- Authority
- US
- United States
- Prior art keywords
- casing
- inner casing
- foundation
- outer casing
- arm
- 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 - Lifetime
Links
Images
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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/28—Supporting or mounting arrangements, e.g. for turbine casing
Definitions
- a foundation supported turbine structure includes a centrally guided inner casing within which is mounted the rotor and stationary guide blading and an outer casing which is spaced from the inner casing.
- the inner casing is supported by cantilever arms secured to the foundation and which extend laterally inward through openings provided in the outer casing to corresponding support points for the inner casing at opposite sides thereof.
- the outer casing includes support feet which are secured to the foundation and a bellows unit surrounds each cantilever arm at the pass-through opening in the outer casing for providing a fluid-tight connection.
- This invention relates to an improved construction for a turbine casing of double-shell construction with the outer casing separate from the inner casing, the inner casing being supported on the foundation by means of supporting arms and the outer casing being joined to the supporting arms.
- Casings for the low-pressure sections of steam turbines are known in which the inner casing is supported on brackets or feet forming part of the outer casing. With low-pressure sections of large dimensions this gives rise during operation to increased deformation corresponding to the size. In other words, there is no assurance that the inner casing will remain exactly centralized and thus damage to the rotor can easily occur.
- a large-capacity steam turbine comprising welded inner and outer casings
- the inner casing is separate from the outer casing and is supported on the turbine foundation via the lower portion of the inner casing by means of supporting members located on the long side of the casing and in a manner allowing expansion, keys able to move relative to the turbine foundation being provided at the ends of the lower portion of the inner casing to allow it to expand in the axial direction.
- the supporting members holding the inner casing on the foundation and the keys at the ends have to be connected to the outer casing by way of flexible, sealed means of shaft compensation.
- the principal object of the present invention is to provide a low-pressure steam turbine casing whose inner casing is completely independent of the movements and forces exerted by the outer casing, and at the same time avoiding the disadvantages described above.
- This objective is achieved by means of a supporting arm in the form of a cantilever beam on two supports, the cantilevered portion supporting the inner casing, which has a central guideway, in a manner allowing expansion.
- the outer casing is rigidly fixed to the supporting arm. This can be done simply be welding, but also by means of rigid, but detachable connections.
- This version has proved beneficial, especially in the case of smaller turbines, because in this manner space is saved and the casing consists of few parts.
- the supporting arms then also have to take the weight of the outer casing.
- the outer casing can be constructed purely as an enclosing membrane, bringing the advantage of an extremely lightweight structure.
- the outer casing is itself supported on the turbine foundation, in which case the outer casing is connected to the supporting beam by way of a flexible membrane.
- the supporting arm for the inner casing is rigidly joined to the foundation, being either of prestressed and/or reinforced concrete, or comprising a beam integral with the turbine foundation.
- Theis construction has the advantage that no auxiliary supports for the inner or outer casing are required during erection or dismantling, and in addition flexure of the supporting arms can be further reduced by virtue of the direct connection.
- FIG. 1 shows a cross-section through a steam turbine casing
- FIG. 2 is a plan view of a part of the low-pressure steam turbine casing as shown in FIG. 1, and
- FIG. 3 shows a section at the bearing points of the supporting arm.
- FIG. 1 the casing l of the low-pressure section of a steam tubine is shown schematically in cross-section.
- the casing 1 comprises essentially an inner casing 2 and an outer casing 3.
- the two casings 2 and 3 are separated from each other in such a way that the forces of mass and movement of the outer casing 3 cannot act on the inner casing 2, and vice versa.
- a bellows 6 is fixed at one end to the supporting arm 4, and at the other end to the outer casing 3 at frame 16, the joints being rigid and steamtight.
- the supporting arm 4 rests on the turbine foundation by way of two bearings 8 and 9, one which, namely bearing 8 closer to the cantilevered portion 5, is subjected to compressive forces, while the other bearing 9 is loaded in tension.
- This can be achieved simply by means of anchor bolts 18 and 19, not shown in FIG. 1, set in the turbine foundation 7.
- the cantilever portion 5 is provided with a bearing 10 which rests on the inner casing 2 by means of flange 11. As indicated symbolically, bearing 10 is movable. This allows compensation of expansion due to heating of the inner casing 2, a central guideway 14 for the inner casing 2 being provided so that the inner casing 2 remains in a central position.
- the outer casing 3 comprises an upper part 12 and a lower part 13. With a casing constructed according to the invention, these parts are to be considered only as an enclosing membrane and are subjected only to forces of internal vacuum, external atmospheric pres sure and their own weight. Because of this, the parts can be made extremely light in weight.
- FIG. 2 shows a partial view of the low-pressure casing l of a steam turbine, the long side of the inner casing 2 resting on the cantilevered portion of supporting arm 4.
- the feet of the outer casing 3 are anchored to the foundation 7 by means of bolts 17, the feet 15 being fixed to the supporting frame 16 of the outer casing 3.
- the upper part of the outer casing 3 is connected to the lower part [3 by means of the steamtight, bolted flanges and 21.
- a flexible, sealing joint here represented by the bellows 6.
- One end of this is connected to frame 16, and the other end to the cantilever 5 of supporting arm 4, forming a steamtight joint.
- the supporting arm 4 is fixed to the turbine foundation 7 rigidly by means of the bearings 8 and 9 provided with the anchor bolts 18 and 19.
- the supporting am 4 is directly connected to the inner casing 2 solely by way of bearing 10, or bearing points 10.
- the flow of heat from the inner casing 2 to the supporting arm 4 is thus greatly restricted, although the supporting arm 4 is still cooled by the exhaust steai'n. Even in the case of nonuniform temperature distribution, therefore, the support of the inner casing cannot become distorted or twisted.
- the central or almost coaxial position of the rotor relative to the inner casing 2 is thus permanently maintained.
- FIG. 3 shows an assembly of the suuporting arm 4 in cross-section, viewed at the line AA in FIG. 2. For reasons of clarity, a part of the supporting arm 4 fixed to the turbine foundation 7 has been omitted.
- Bearing 8 is provided with a centering device 26 which engages a key 27 mounted on the supporting arm 4.
- Another bolt 18 fixes the supporting arm 4 to turbine foundation 7.
- the outer casing 3, comprising upper part 12 and lower part 13, with supporting frame 16, is fixed to the turbine foundation 7 by means of brackets 15 attached to the frame 16, foundation bolts 17 being used for this purpose.
- Bellows 6, forming a steamtight joint, is fitted between supporting arm 4, or its cantilevered portion 5, and the frame 16 of outer casing 3.
- the upper part 12 and lower part 13 are rigidly joined together at flanges 20 and 21.
- the cantilevered portion 5 of supporting arm 4 has at its end a bearing plate 22. To this is fixed a slide plate 23 on which the plate 24 can slide in any direction.
- the plate 24 has a spherical surface 28 which engages in a matching piece set in flange 11. When the inner casing expands, flange 11 will move radially relative to slide plate 23, whereupon the plate 24, centered and guided by the spherical surface 28, will follow the movement in an ommi-directional manner.
- the bearing 10, comprising the components stated above, will thus move uniformly, the central position of the turbine being determined by the central guide 14 indicated in FIG. 1.
- the invention is not restricted to the casing of the low-pressure section of a steam turbine, and when suitably modified could also be used in a high-pressure or intermediate-pressure section. Furthermore, a casing constructed in accordance with the invention could also be applied to other fluid flow machines without thus forfeiting the advantages described.
- the supporting arm 4 serves at the same time as a steam inlet.
- a crossover pipe or a live steam line 30 can be located in the supporting arm 4, which has the form of a hollow beam.
- the line must then be provided with insulation.
- a foundation supported turbine structure wherein the turbine casing is of the double-shell type comprising an inner casing within which is mounted the rotor and stationary guide blading and an outer casing spaced from said inner casing, central guide means for said inner casing for accommodating thermal expansion thereof, support means for said inner casing comprising cantilever arms carried by the foundation and extending laterally inward therefrom through openings provided in said outer casing to corresponding support points for said inner casing at opposite sides thereof, each said support point for said inner casing on said cantilever arm including a bearing structure mounted for omni-directional sliding movement on said arm in a horizontal plane, and means for supporting said outer casing at least indirectly by said foundation.
- a foundation supported turbine structure as defined in claim 1 wherein the bearing structure located at each said support point for said inner casing on said cantilever arm and which is mounted for omnidirectional sliding movement on said arm is a horizontal plane includes a fixed slide plate at the inner end of said cantilever arm, and a movable plate slidable omnidirectionally on said fixed plate, the upper side of said movable plate including a spherical surface engaged with a complementary spherical surface on a horizontal flanged part of said inner casing.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Support Of The Bearing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1722172A CH552130A (de) | 1972-11-28 | 1972-11-28 | Turbinengehaeuse. |
Publications (1)
Publication Number | Publication Date |
---|---|
US3881843A true US3881843A (en) | 1975-05-06 |
Family
ID=4423707
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US411220A Expired - Lifetime US3881843A (en) | 1972-11-28 | 1973-10-31 | Low-pressure steam turbine casing |
Country Status (9)
Country | Link |
---|---|
US (1) | US3881843A (de) |
JP (1) | JPS4981702A (de) |
CA (1) | CA989629A (de) |
CH (1) | CH552130A (de) |
DE (1) | DE2261718C3 (de) |
FR (1) | FR2208440A5 (de) |
GB (1) | GB1420486A (de) |
IT (1) | IT1002119B (de) |
SE (1) | SE388455B (de) |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3942907A (en) * | 1974-04-02 | 1976-03-09 | Bbc Brown Boveri & Company Limited | Two-shell casing for fluid flow machine |
US3982849A (en) * | 1974-12-16 | 1976-09-28 | Bbc Brown Boveri & Company Limited | Low pressure steam turbine construction |
US4050660A (en) * | 1975-07-02 | 1977-09-27 | Bbc Brown Boveri & Company Limited | Casing support for horizontal-axis casings expanding in operation |
US4413948A (en) * | 1981-07-31 | 1983-11-08 | Kraftwerk Union Aktiengesellschaft | Double shell steam turbine housing assembly |
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 |
US5094588A (en) * | 1989-08-28 | 1992-03-10 | Gec Alsthom Sa | Concrete steam condenser for an axial exhaust turbine and turbine provided with same |
US5106264A (en) * | 1989-04-28 | 1992-04-21 | Gec Alsthom Sa | System for supporting the rotor of an axial exhaust turbine with the exhaust end bearing being integrated in the foundation |
US5108258A (en) * | 1989-04-26 | 1992-04-28 | Gec Alsthom Sa | System for supporting the rotor in an axial exhaust turbine with an exhaust end bearing having isotropic stiffness and directly connected to a foundation |
US5290146A (en) * | 1992-06-20 | 1994-03-01 | Asea Brown Boveri Ag | Outer casing of a low-pressure part of a steam turbine |
ES2052427A2 (es) * | 1991-02-01 | 1994-07-01 | Westinghouse Electric Corp | Disposicion de soporte para optimizar las caracteristicas estructurales del cilindro interior de una turbina de vapor de baja presion. |
US6171053B1 (en) * | 1997-04-28 | 2001-01-09 | Siemens Aktiengesellschaft | Device for thermally insulating a steam turbine casing |
US20110020117A1 (en) * | 2008-03-31 | 2011-01-27 | Makoto Kondo | Casing structure of steam turbine |
US20110142605A1 (en) * | 2009-12-16 | 2011-06-16 | General Electric Company | Low-pressure steam turbine hood and inner casing supported on curb foundation |
US20120163968A1 (en) * | 2010-12-24 | 2012-06-28 | Alstom Technology Ltd | Module for a steam turbine |
US20120195750A1 (en) * | 2011-01-31 | 2012-08-02 | General Electric Company | Turbomachine supports having thermal control system |
DE102012103890A1 (de) | 2011-05-05 | 2012-11-08 | General Electric Company | Abstützungsanordnung für das Niederdruckgehäuse einer Dampfturbine |
CN103362575A (zh) * | 2012-03-27 | 2013-10-23 | 通用电气公司 | 侧支撑涡轮壳 |
CN103628935A (zh) * | 2012-08-24 | 2014-03-12 | 通用电气公司 | 用于减少涡轮转子和壳支撑件的热增长差异的冷却回路 |
US9359913B2 (en) | 2013-02-27 | 2016-06-07 | General Electric Company | Steam turbine inner shell assembly with common grooves |
CN106401672A (zh) * | 2016-11-01 | 2017-02-15 | 东方电气集团东方汽轮机有限公司 | 一种汽轮机低压内缸轴向落地结构 |
US10487692B2 (en) * | 2016-11-24 | 2019-11-26 | Kabushiki Kaisha Toshiba | Steam turbine |
US10494956B2 (en) | 2017-10-16 | 2019-12-03 | General Electric Company | Fastener assembly for securing a turbomachine casing and method for securing the casing |
US10746058B2 (en) * | 2018-03-06 | 2020-08-18 | Kabushiki Kaisha Toshiba | Steam turbine |
US11174758B2 (en) * | 2019-12-11 | 2021-11-16 | Kabushiki Kaisha Toshiba | Steam turbine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3837510C2 (de) * | 1988-11-04 | 1998-01-22 | Asea Brown Boveri | Zweigehäusige Niederdruckdampfturbine |
JP6235502B2 (ja) * | 2015-01-27 | 2017-11-22 | 三菱日立パワーシステムズ株式会社 | 蒸気タービン設備 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1682317A (en) * | 1928-08-28 | Turbine support | ||
US2443054A (en) * | 1946-11-07 | 1948-06-08 | Westinghouse Electric Corp | Gas turbine plant |
US2888240A (en) * | 1956-03-07 | 1959-05-26 | Allis Chalmers Mfg Co | Fluid cooled barrel cylinder for turbines |
-
1972
- 1972-11-28 CH CH1722172A patent/CH552130A/de not_active IP Right Cessation
- 1972-12-16 DE DE2261718A patent/DE2261718C3/de not_active Expired
-
1973
- 1973-10-05 JP JP48112221A patent/JPS4981702A/ja active Pending
- 1973-10-31 US US411220A patent/US3881843A/en not_active Expired - Lifetime
- 1973-11-02 CA CA184,928A patent/CA989629A/en not_active Expired
- 1973-11-20 SE SE7315701A patent/SE388455B/xx unknown
- 1973-11-26 GB GB5471073A patent/GB1420486A/en not_active Expired
- 1973-11-26 FR FR7342000A patent/FR2208440A5/fr not_active Expired
- 1973-11-29 IT IT31925/73A patent/IT1002119B/it active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1682317A (en) * | 1928-08-28 | Turbine support | ||
US2443054A (en) * | 1946-11-07 | 1948-06-08 | Westinghouse Electric Corp | Gas turbine plant |
US2888240A (en) * | 1956-03-07 | 1959-05-26 | Allis Chalmers Mfg Co | Fluid cooled barrel cylinder for turbines |
Cited By (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3942907A (en) * | 1974-04-02 | 1976-03-09 | Bbc Brown Boveri & Company Limited | Two-shell casing for fluid flow machine |
US3982849A (en) * | 1974-12-16 | 1976-09-28 | Bbc Brown Boveri & Company Limited | Low pressure steam turbine construction |
US4050660A (en) * | 1975-07-02 | 1977-09-27 | Bbc Brown Boveri & Company Limited | Casing support for horizontal-axis casings expanding in operation |
US4413948A (en) * | 1981-07-31 | 1983-11-08 | Kraftwerk Union Aktiengesellschaft | Double shell steam turbine housing assembly |
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 |
US5108258A (en) * | 1989-04-26 | 1992-04-28 | Gec Alsthom Sa | System for supporting the rotor in an axial exhaust turbine with an exhaust end bearing having isotropic stiffness and directly connected to a foundation |
US5106264A (en) * | 1989-04-28 | 1992-04-21 | Gec Alsthom Sa | System for supporting the rotor of an axial exhaust turbine with the exhaust end bearing being integrated in the foundation |
US5094588A (en) * | 1989-08-28 | 1992-03-10 | Gec Alsthom Sa | Concrete steam condenser for an axial exhaust turbine and turbine provided with same |
ES2052427A2 (es) * | 1991-02-01 | 1994-07-01 | Westinghouse Electric Corp | Disposicion de soporte para optimizar las caracteristicas estructurales del cilindro interior de una turbina de vapor de baja presion. |
US5290146A (en) * | 1992-06-20 | 1994-03-01 | Asea Brown Boveri Ag | Outer casing of a low-pressure part of a steam turbine |
US6171053B1 (en) * | 1997-04-28 | 2001-01-09 | Siemens Aktiengesellschaft | Device for thermally insulating a steam turbine casing |
US20110020117A1 (en) * | 2008-03-31 | 2011-01-27 | Makoto Kondo | Casing structure of steam turbine |
EP2305962A1 (de) * | 2008-03-31 | 2011-04-06 | Mitsubishi Heavy Industries, Ltd. | Kammerstruktur für dampfturbine |
US8777565B2 (en) | 2008-03-31 | 2014-07-15 | Mitsubishi Heavy Industries, Ltd. | Casing structure of steam turbine |
EP2305962A4 (de) * | 2008-03-31 | 2013-03-27 | Mitsubishi Heavy Ind Ltd | Kammerstruktur für dampfturbine |
US20110142605A1 (en) * | 2009-12-16 | 2011-06-16 | General Electric Company | Low-pressure steam turbine hood and inner casing supported on curb foundation |
US8403628B2 (en) | 2009-12-16 | 2013-03-26 | General Electric Company | Low-pressure steam turbine hood and inner casing supported on curb foundation |
US20120163968A1 (en) * | 2010-12-24 | 2012-06-28 | Alstom Technology Ltd | Module for a steam turbine |
US9091181B2 (en) * | 2010-12-24 | 2015-07-28 | Alstom Technology Ltd. | Module for a steam turbine |
US20120195750A1 (en) * | 2011-01-31 | 2012-08-02 | General Electric Company | Turbomachine supports having thermal control system |
DE102012103890A1 (de) | 2011-05-05 | 2012-11-08 | General Electric Company | Abstützungsanordnung für das Niederdruckgehäuse einer Dampfturbine |
US8821110B2 (en) | 2011-05-05 | 2014-09-02 | General Electric Company | Support arrangement for a steam turbine LP inner casing |
CN103362575A (zh) * | 2012-03-27 | 2013-10-23 | 通用电气公司 | 侧支撑涡轮壳 |
US9157335B2 (en) | 2012-03-27 | 2015-10-13 | General Electric Company | Side supported turbine shell |
CN103362575B (zh) * | 2012-03-27 | 2016-09-14 | 通用电气公司 | 侧支撑涡轮壳 |
CN103628935A (zh) * | 2012-08-24 | 2014-03-12 | 通用电气公司 | 用于减少涡轮转子和壳支撑件的热增长差异的冷却回路 |
US9376934B2 (en) | 2012-08-24 | 2016-06-28 | General Electric Company | Cooling circuit for reducing thermal growth differential of turbine rotor and shell supports |
US9359913B2 (en) | 2013-02-27 | 2016-06-07 | General Electric Company | Steam turbine inner shell assembly with common grooves |
CN106401672A (zh) * | 2016-11-01 | 2017-02-15 | 东方电气集团东方汽轮机有限公司 | 一种汽轮机低压内缸轴向落地结构 |
US10487692B2 (en) * | 2016-11-24 | 2019-11-26 | Kabushiki Kaisha Toshiba | Steam turbine |
US10494956B2 (en) | 2017-10-16 | 2019-12-03 | General Electric Company | Fastener assembly for securing a turbomachine casing and method for securing the casing |
US10746058B2 (en) * | 2018-03-06 | 2020-08-18 | Kabushiki Kaisha Toshiba | Steam turbine |
US11174758B2 (en) * | 2019-12-11 | 2021-11-16 | Kabushiki Kaisha Toshiba | Steam turbine |
Also Published As
Publication number | Publication date |
---|---|
SE388455B (sv) | 1976-10-04 |
JPS4981702A (de) | 1974-08-07 |
DE2261718B2 (de) | 1980-05-14 |
IT1002119B (it) | 1976-05-20 |
CA989629A (en) | 1976-05-25 |
DE2261718C3 (de) | 1981-01-15 |
DE2261718A1 (de) | 1974-05-30 |
CH552130A (de) | 1974-07-31 |
GB1420486A (en) | 1976-01-07 |
FR2208440A5 (de) | 1974-06-21 |
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