US20120177494A1 - Steam turbine rotor with mechanically coupled high and low temperature sections using different materials - Google Patents
Steam turbine rotor with mechanically coupled high and low temperature sections using different materials Download PDFInfo
- Publication number
- US20120177494A1 US20120177494A1 US12/985,508 US98550811A US2012177494A1 US 20120177494 A1 US20120177494 A1 US 20120177494A1 US 98550811 A US98550811 A US 98550811A US 2012177494 A1 US2012177494 A1 US 2012177494A1
- Authority
- US
- United States
- Prior art keywords
- turbine rotor
- rotor
- section
- temperature
- stage
- 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
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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
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/026—Shaft to shaft connections
-
- 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
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/06—Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections
- F01D5/066—Connecting means for joining rotor-discs or rotor-elements together, e.g. by a central bolt, by clamps
-
- 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
- F05D2300/00—Materials; Properties thereof
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/502—Thermal properties
-
- 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
- F05D2300/00—Materials; Properties thereof
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/502—Thermal properties
- F05D2300/5021—Expansivity
- F05D2300/50212—Expansivity dissimilar
Definitions
- This invention relates to rotors for turbomachines and, more specifically, to the construction of rotors in axial sections of different materials.
- this invention relates to a turbine rotor comprising an elongated shaft including at least an HP region, the HP region having a first axial section supporting a stage 1 rotor wheel and a second axial section supporting a stage 2 rotor wheel, the first axial section formed of a relatively higher-temperature-capability material and the second axial section formed of a relatively lower-temperature-capability material; and means for mechanically coupling the first axial section and the second axial section.
- the invention in another aspect, relates to the turbine rotor comprising an elongated shaft including at least HP and IP regions, a combined HP/IP region having at least a first section supporting a stage 1 rotor wheel and a second section supporting a stage 2 rotor wheel, the first section formed of a relatively higher-temperature-capability material and the second section formed of a relatively lower-temperature-capability material; and wherein said first and second sections are joined by a mechanical coupling
- FIG. 1 is a schematic diagram of a turbine rotor region with mechanically-coupled sections in accordance with a first exemplary but nonlimiting embodiment
- FIG. 2 is a schematic diagram similar to FIG. 1 but with an alternative mechanical coupling between the turbine sections in accordance with an exemplary but nonlimiting embodiment
- FIG. 3 is a schematic diagram similar to FIG. 2 but with an alternative mechanical coupling between the turbine sections in accordance with an exemplary but nonlimiting embodiment
- FIG. 4 is a schematic diagram similar to FIG. 3 but with an alternative mechanical coupling between the turbine sections in accordance with an exemplary but nonlimiting embodiment
- FIG. 5 is a schematic diagram similar to FIG. 4 but with an alternative mechanical coupling between the turbine sections in accordance with an exemplary but nonlimiting embodiment
- FIG. 6 is a schematic diagram similar to FIG. 5 but with an alternative mechanical coupling between the turbine sections in accordance with an exemplary but nonlimiting embodiment.
- a steam turbine rotor 10 is shown in schematic from and includes at least a high pressure (HP) region (or combined HP and intermediate pressure (IP) region) 12 that is formed to include at least first and second stage rotor wheels 14 , 16 , each of which supports a row of buckets 18 , 20 , respectively.
- HP high pressure
- IP intermediate pressure
- the rotor 10 is formed in two axially-oriented and aligned sections 22 , 24 .
- Section 22 includes the first stage rotor wheel 14 while section 24 includes the second stage rotor wheel 16 .
- Section 22 is in a high temperature region, exposed to steam at temperatures of about and above 1050° F.
- Section 24 is in a lower temperature region, exposed to steam at a temperature of about and less than 1050° F.
- the inventors have recognized that significant cost savings can be realized by using different materials for the rotor sections 22 , 24 within the HP or combined HP/IP region 12 .
- a more expensive 12% Cr material e.g., ASTM A982, Grade B
- a less expensive, lower % Cr material such as a Cr-MO-V material (e.g. ASTM A470, Grade D, Class 8) is suitable.
- the rotor sections 22 and 24 are preferably joined together by any of several suitable mechanical coupling arrangements.
- the rotor sections 22 and 24 are provided with (or formed with) facing radial flanges 26 , 28 , respectively, located between the first and second stage rotor wheels 14 , 16 and joined by a circumferential array of axially-extending fasteners such as bolts 30 passing through the flanges and secured by nuts 32 .
- FIG. 2 illustrates an alternative coupling arrangement where the radial flange 28 is eliminated and flange 26 is bolted directly to a hub portion 15 of the rotor wheel 16 using similar fasteners 30 , 32 .
- FIG. 3 illustrates another mechanical coupling arrangement between the rotor sections 22 , 24 .
- a reduced diameter end portion 34 of the section 24 is received within a blind bore 36 formed in section 22 axially between the rotor wheels 14 , 16 .
- the coupled sections are secured by two or three fasteners (e.g. bolts) 38 oriented radially with respect to the longitudinal axis of the rotor.
- FIG. 4 illustrates another example embodiment wherein a partially-threaded stud 40 extends between the rotor sections 22 , 24 .
- a threaded, blind bore 42 is formed in the end of rotor section 24 , aligned with a smooth through-bore 44 formed in rotor section 22 .
- the stud 40 is inserted through the smooth through-bore 44 and the threaded end 46 of the stud is threaded into the blind bore 42 .
- a threaded opposite end 48 of the stud 40 projects from the rotor section 22 and a nut 50 is applied there to lock the stud 40 in place, with sections 22 , 24 joined together axially between the rotor wheels 14 , 16 .
- the smooth portion of the stud 40 could terminate short of the flange 51 and a separate bolt could be threaded into the end of the bore 44 to lock the stud in place.
- FIG. 5 illustrates yet another exemplary mechanical coupling utilizing a spline arrangement.
- a reduced-diameter male spline 52 is formed at one end of the rotor section 24 .
- a female spline 54 is formed in the rotor section 22 , with elongated slots (i.e., complimentary spline slots) 56 aligned to receive the elongated ribs 58 of the male spline 52 .
- the coupling occurs between the rotor wheels 14 , 16 .
- FIG. 6 illustrates a variation of the spline coupling of FIG. 5 .
- the male spline 60 of the rotor section is in a cross-shape, with four equally-spaced ribs 62 .
- the female spline 64 in rotor section 22 is formed with four aligned slots 66 that receive the ribs 62 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
A turbine rotor including an elongated shaft having at least an HP region, the HP region having a first section supporting a stage 1 rotor wheel and a second section supporting a stage 2 rotor wheel, the first section formed of a relatively higher-temperature-capability material and the second section formed of a relatively lower-temperature-capability material. Various mechanical couplings and described for securing the first and second sections.
Description
- This invention relates to rotors for turbomachines and, more specifically, to the construction of rotors in axial sections of different materials.
- In a recent steam turbine rotor, and following a tendency to high temperatures for steam, a 12% chromium steel is used, as it is excellent in high temperature strength and toughness. In such a rotor, both for a high temperature portion exposed to a high temperature steam and a low temperature portion exposed to a low temperature steam, the same 12% chromium steel is used. But as rotors have become larger in recent years, it is becoming difficult and expensive to manufacture the rotor so as to satisfy characteristics both of the high temperature portion and the low temperature portion with one material.
- While the expensive 12% chromium steel satisfies the required heat resistance, creep characteristics, etc. of the portion exposed to the high temperature steam, it is not necessary to use such an expensive material for the low temperature portion, so long as the requisite toughness is retained. In order to meet these problems it has attempted to join rotor portions of different materials together by welding to make a single rotor.
- In a first exemplary but non-limiting embodiment, this invention relates to a turbine rotor comprising an elongated shaft including at least an HP region, the HP region having a first axial section supporting a stage 1 rotor wheel and a second axial section supporting a stage 2 rotor wheel, the first axial section formed of a relatively higher-temperature-capability material and the second axial section formed of a relatively lower-temperature-capability material; and means for mechanically coupling the first axial section and the second axial section.
- In another aspect, the invention relates to the turbine rotor comprising an elongated shaft including at least HP and IP regions, a combined HP/IP region having at least a first section supporting a stage 1 rotor wheel and a second section supporting a stage 2 rotor wheel, the first section formed of a relatively higher-temperature-capability material and the second section formed of a relatively lower-temperature-capability material; and wherein said first and second sections are joined by a mechanical coupling
- The invention will now be described in connection with the drawings identified below.
-
FIG. 1 is a schematic diagram of a turbine rotor region with mechanically-coupled sections in accordance with a first exemplary but nonlimiting embodiment; -
FIG. 2 is a schematic diagram similar toFIG. 1 but with an alternative mechanical coupling between the turbine sections in accordance with an exemplary but nonlimiting embodiment; -
FIG. 3 is a schematic diagram similar toFIG. 2 but with an alternative mechanical coupling between the turbine sections in accordance with an exemplary but nonlimiting embodiment; -
FIG. 4 is a schematic diagram similar toFIG. 3 but with an alternative mechanical coupling between the turbine sections in accordance with an exemplary but nonlimiting embodiment; -
FIG. 5 is a schematic diagram similar toFIG. 4 but with an alternative mechanical coupling between the turbine sections in accordance with an exemplary but nonlimiting embodiment; and -
FIG. 6 is a schematic diagram similar toFIG. 5 but with an alternative mechanical coupling between the turbine sections in accordance with an exemplary but nonlimiting embodiment. - With reference initially to
FIG. 1 , asteam turbine rotor 10 is shown in schematic from and includes at least a high pressure (HP) region (or combined HP and intermediate pressure (IP) region) 12 that is formed to include at least first and secondstage rotor wheels buckets IP region 12, therotor 10 is formed in two axially-oriented and alignedsections Section 22 includes the firststage rotor wheel 14 whilesection 24 includes the secondstage rotor wheel 16. It will be appreciated thatsection 22 is in a high temperature region, exposed to steam at temperatures of about and above 1050°F. Section 24, on the other hand, is in a lower temperature region, exposed to steam at a temperature of about and less than 1050° F. - The inventors have recognized that significant cost savings can be realized by using different materials for the
rotor sections IP region 12. - For the
rotor section 22, a more expensive 12% Cr material (e.g., ASTM A982, Grade B) is suitable while forsection 24, a less expensive, lower % Cr material such as a Cr-MO-V material (e.g. ASTM A470, Grade D, Class 8) is suitable. - The
rotor sections FIG. 1 , for example, therotor sections radial flanges stage rotor wheels bolts 30 passing through the flanges and secured bynuts 32. -
FIG. 2 illustrates an alternative coupling arrangement where theradial flange 28 is eliminated andflange 26 is bolted directly to ahub portion 15 of therotor wheel 16 usingsimilar fasteners -
FIG. 3 illustrates another mechanical coupling arrangement between therotor sections diameter end portion 34 of thesection 24 is received within ablind bore 36 formed insection 22 axially between therotor wheels -
FIG. 4 illustrates another example embodiment wherein a partially-threadedstud 40 extends between therotor sections blind bore 42 is formed in the end ofrotor section 24, aligned with a smooth through-bore 44 formed inrotor section 22. Thestud 40 is inserted through the smooth through-bore 44 and the threadedend 46 of the stud is threaded into theblind bore 42. A threadedopposite end 48 of thestud 40 projects from therotor section 22 and anut 50 is applied there to lock thestud 40 in place, withsections rotor wheels stud 40 could terminate short of theflange 51 and a separate bolt could be threaded into the end of thebore 44 to lock the stud in place. -
FIG. 5 illustrates yet another exemplary mechanical coupling utilizing a spline arrangement. Specifically, a reduced-diametermale spline 52 is formed at one end of therotor section 24. Afemale spline 54 is formed in therotor section 22, with elongated slots (i.e., complimentary spline slots) 56 aligned to receive theelongated ribs 58 of themale spline 52. As in the previously described embodiments, the coupling occurs between therotor wheels -
FIG. 6 illustrates a variation of the spline coupling ofFIG. 5 . Here, themale spline 60 of the rotor section is in a cross-shape, with four equally-spaced ribs 62. Similarly, thefemale spline 64 inrotor section 22 is formed with four alignedslots 66 that receive theribs 62. - For the embodiments illustrated in
FIGS. 5 and 6 , it will be appreciated that the spline arrangements may be reversed, with the male spline inrotor section 22 and the female spline onrotor section 24. - Other mechanical coupling arrangements are within the scope of the invention. In all cases, secure axial coupling that prevents relative rotation of the rotor sections is required.
- While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (17)
1. A turbine rotor comprising:
an elongated shaft including at least an HP region, the HP region having a first axial section supporting a stage 1 rotor wheel and a second axial section supporting a stage 2 rotor wheel, said first axial section formed of a relatively higher-temperature-capability material and said second axial section formed of a relatively lower-temperature-capability material; and
means for mechanically coupling said first axial section and said second axial section.
2. The turbine rotor of claim 1 wherein said relatively higher-temperature-capability material comprises a 12% Cr material.
3. The turbine rotor of claim 1 wherein said relatively lower-temperature-capability material comprises a CrMoV material.
4. The turbine rotor of claim 2 wherein said relatively lower-temperature-capability material comprises a CrMoV material.
5. The turbine rotor of claim 1 wherein said first axial section and said second axial section are coupled between said stage 1 and stage 2 rotor wheels.
6. A turbine rotor comprising: an elongated shaft including at least HP and IP regions, a combined HP region having a first section supporting a stage 1 rotor wheel and a second section supporting a stage 2 rotor wheel, said first section formed of a relatively higher-temperature-capability material and said second section formed of a relatively lower-temperature-capability material; and
wherein said first and second sections are joined by a mechanical coupling.
7. The turbine rotor of claim 7 wherein said mechanical coupling comprises abutting flanges on said first and second sections and plural bolts passing through said abutting flanges.
8. The turbine rotor of claim 7 wherein said mechanical coupling comprises a flange on said first section engaged with a hub of said stage 2 rotor wheel, and plural bolts passing through said flange and said hub.
9. The turbine rotor of claim 7 wherein said mechanical coupling comprises a reduced diameter end of one of said first and second sections received in a blind bore in the other of said first and second sections.
10. The turbine rotor of claim 7 wherein said mechanical coupling comprises a first bore through said first section and a second blind bore on said second section, with a stud extending between said first bore and said second blind bore.
11. The turbine rotor of claim 10 wherein said stud is threaded into said blind bore.
12. The turbine rotor of claim 6 wherein said mechanical coupling comprises a male spline extending from said second section and received in a female spline in said first section.
13. The turbine rotor of claim 12 wherein said male spline is formed with at least six radially projecting teeth that extend axially along said male spline.
14. The turbine rotor of claim 12 wherein said mail spline is formed with four radially projecting teeth, spaced substantially 90° apart about an axis of rotation of said turbine rotor.
15. The turbine rotor of claim 7 wherein said relatively higher temperature capability material comprises a 12% Cr material.
16. The turbine rotor of claim 7 wherein said relatively lower temperature capability material comprises a CrMoV material.
17. The turbine rotor of claim 15 wherein said relatively lower temperature capability material comprises a CrMoV material.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/985,508 US20120177494A1 (en) | 2011-01-06 | 2011-01-06 | Steam turbine rotor with mechanically coupled high and low temperature sections using different materials |
EP11195293A EP2479377A2 (en) | 2011-01-06 | 2011-12-22 | Steam turbine rotor with mechanically coupled high and low temperature sections using different materials |
JP2011287521A JP2012145104A (en) | 2011-01-06 | 2011-12-28 | Steam turbine rotor with mechanically coupled high and low temperature sections using different material |
RU2011154008/06A RU2011154008A (en) | 2011-01-06 | 2011-12-29 | TURBINE ROTOR (OPTIONS) |
CN2012100141301A CN102587996A (en) | 2011-01-06 | 2012-01-06 | Steam turbine rotor with mechanically coupled high and low temperature sections using different materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/985,508 US20120177494A1 (en) | 2011-01-06 | 2011-01-06 | Steam turbine rotor with mechanically coupled high and low temperature sections using different materials |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120177494A1 true US20120177494A1 (en) | 2012-07-12 |
Family
ID=45442969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/985,508 Abandoned US20120177494A1 (en) | 2011-01-06 | 2011-01-06 | Steam turbine rotor with mechanically coupled high and low temperature sections using different materials |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120177494A1 (en) |
EP (1) | EP2479377A2 (en) |
JP (1) | JP2012145104A (en) |
CN (1) | CN102587996A (en) |
RU (1) | RU2011154008A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105317465A (en) * | 2015-11-26 | 2016-02-10 | 北京全三维能源科技股份有限公司 | Steam turbine and bolt combination rotor thereof and assembly method of combination rotor |
US11021960B2 (en) | 2016-07-05 | 2021-06-01 | Exergy International S.R.L. | Set of turbines and a turbine train comprising at least one such set |
US20220251957A1 (en) * | 2021-02-11 | 2022-08-11 | Pratt & Whitney Canada Corp. | Gas turbine engine rotor assembly and method of using same |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103470309A (en) * | 2013-08-21 | 2013-12-25 | 东方电气集团东方汽轮机有限公司 | Segmented combined type rotor |
CN105351011B (en) * | 2015-11-26 | 2017-03-29 | 北京全三维能源科技股份有限公司 | Steam turbine and its pin combined rotor, the assemble method of combined rotor |
CN107856056B (en) * | 2017-12-18 | 2024-02-20 | 浙江钱江机器人有限公司 | Wrist part of robot |
CN112678148B (en) * | 2020-12-22 | 2022-05-20 | 大连理工大学 | Independent high-low temperature connecting structure with arch-shaped support |
Citations (9)
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US4123199A (en) * | 1976-03-31 | 1978-10-31 | Tokyo Shibaura Electric Co., Ltd. | Rotor-shaft assembly |
JPS5793605A (en) * | 1980-12-01 | 1982-06-10 | Hitachi Ltd | Steam turbine rotor assembly |
US4683714A (en) * | 1986-06-17 | 1987-08-04 | General Motors Corporation | Oil scavenge system |
US6909213B2 (en) * | 2001-12-12 | 2005-06-21 | Valeo Motoren Und Aktuatoren Gmbh | Actuating device, particularly for actuating locking differentials on vehicles |
US7771166B2 (en) * | 2004-03-17 | 2010-08-10 | Siemens Aktiengesellschaft | Welded turbine shaft and method for producing said shaft |
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US20110070069A1 (en) * | 2009-09-23 | 2011-03-24 | General Electric Company | Steam turbine having rotor with cavities |
US8465259B2 (en) * | 2010-04-29 | 2013-06-18 | Siemens Energy, Inc. | Gas turbine spindle bolt structure with reduced fretting motion |
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CH83747A (en) * | 1919-04-12 | 1920-06-01 | Der Maschinenfabriken Escher & | Rotating part for multi-stage, high-speed machines, especially steam turbines |
US6352385B1 (en) * | 2000-07-31 | 2002-03-05 | General Electric Company | Mechanical coupling for cooperating rotatable members |
US6994519B2 (en) * | 2003-05-20 | 2006-02-07 | General Electric Company | Apparatus and methods for coupling axially aligned turbine rotors |
JP4805728B2 (en) * | 2006-05-31 | 2011-11-02 | 株式会社東芝 | Steam turbine rotor and steam turbine |
-
2011
- 2011-01-06 US US12/985,508 patent/US20120177494A1/en not_active Abandoned
- 2011-12-22 EP EP11195293A patent/EP2479377A2/en not_active Withdrawn
- 2011-12-28 JP JP2011287521A patent/JP2012145104A/en active Pending
- 2011-12-29 RU RU2011154008/06A patent/RU2011154008A/en not_active Application Discontinuation
-
2012
- 2012-01-06 CN CN2012100141301A patent/CN102587996A/en active Pending
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US4123199A (en) * | 1976-03-31 | 1978-10-31 | Tokyo Shibaura Electric Co., Ltd. | Rotor-shaft assembly |
JPS5793605A (en) * | 1980-12-01 | 1982-06-10 | Hitachi Ltd | Steam turbine rotor assembly |
US4683714A (en) * | 1986-06-17 | 1987-08-04 | General Motors Corporation | Oil scavenge system |
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US7771166B2 (en) * | 2004-03-17 | 2010-08-10 | Siemens Aktiengesellschaft | Welded turbine shaft and method for producing said shaft |
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US8465259B2 (en) * | 2010-04-29 | 2013-06-18 | Siemens Energy, Inc. | Gas turbine spindle bolt structure with reduced fretting motion |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105317465A (en) * | 2015-11-26 | 2016-02-10 | 北京全三维能源科技股份有限公司 | Steam turbine and bolt combination rotor thereof and assembly method of combination rotor |
US11021960B2 (en) | 2016-07-05 | 2021-06-01 | Exergy International S.R.L. | Set of turbines and a turbine train comprising at least one such set |
US20220251957A1 (en) * | 2021-02-11 | 2022-08-11 | Pratt & Whitney Canada Corp. | Gas turbine engine rotor assembly and method of using same |
US11674394B2 (en) * | 2021-02-11 | 2023-06-13 | Pratt & Whitney Canada Corp. | Gas turbine engine rotor assembly and method of using same |
Also Published As
Publication number | Publication date |
---|---|
JP2012145104A (en) | 2012-08-02 |
RU2011154008A (en) | 2013-07-10 |
CN102587996A (en) | 2012-07-18 |
EP2479377A2 (en) | 2012-07-25 |
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Legal Events
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AS | Assignment |
Owner name: GENERAL ELECTRIC COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PARASHAR, DUTTATREY;KUMAR, SANDEEP;REEL/FRAME:025593/0625 Effective date: 20101202 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |