EP2192266A1 - Rotorvorrichtung für eine Dampfturbine und Dampfturbine - Google Patents

Rotorvorrichtung für eine Dampfturbine und Dampfturbine Download PDF

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Publication number
EP2192266A1
EP2192266A1 EP08020581A EP08020581A EP2192266A1 EP 2192266 A1 EP2192266 A1 EP 2192266A1 EP 08020581 A EP08020581 A EP 08020581A EP 08020581 A EP08020581 A EP 08020581A EP 2192266 A1 EP2192266 A1 EP 2192266A1
Authority
EP
European Patent Office
Prior art keywords
rotor device
steam turbine
peripheral surface
inner casing
balance piston
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Withdrawn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
EP08020581A
Other languages
English (en)
French (fr)
Inventor
Per Hortlund
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP08020581A priority Critical patent/EP2192266A1/de
Publication of EP2192266A1 publication Critical patent/EP2192266A1/de
Withdrawn legal-status Critical Current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
    • F01D3/00—Machines or engines with axial-thrust balancing effected by working-fluid
    • F01D3/04—Machines or engines with axial-thrust balancing effected by working-fluid axial thrust being compensated by thrust-balancing dummy piston or the like
    • 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
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/31—Application in turbines in steam turbines
    • 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
    • F05D2240/00—Components
    • F05D2240/50—Bearings
    • F05D2240/52—Axial thrust bearings
    • 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
    • F05D2260/30—Retaining components in desired mutual position
    • F05D2260/33—Retaining components in desired mutual position with a bayonet coupling

Definitions

  • the present invention relates to a rotor device for a steam turbine, which is rotatably mounted around an axis, comprising a number of blades arranged at the rotor device.
  • the invention relates further to a steam turbine, comprising a rotor device.
  • the axis of turbines has during operation a certain axial push. These axial push has to be balanced by an appropriate bearing of the axis.
  • the management of the axial forces can be done by axial bearings and/or with a small balance piston. But with an increasing size of the blades, in particular of low-pressure blades, the axial forces are very high and therefore cannot be managed by a small balance piston and the use of large bearings is disadvantageous.
  • a small balance piston makes it possible to mount the inner casing in one part over the shaft end of the rotor, whereby the small balance piston is part of the rotor forging. But if more power from the turbine is taken out the axial forces on the rotor will increase.
  • Using a larger balance piston, which is part of the rotor forging, has the disadvantageous that the diameter of the piston will be to large for a one-piece inner casing, so that the inner casing has to be divided into at least two parts.
  • a divided inner casing has disadvantages, because of the slit between the parts.
  • the problem to be solved by the present invention is thus to overcome these drawbacks of the prior art solution.
  • the problem to be solved is to create a rotor device and a steam turbine comprising a rotor device which can manage high axial forces caused by blades, which are arranged at the rotor device, whereby the inner casing, which is fixed over the rotor device, is built in one-piece.
  • a rotor device for a steam turbine which is rotatably mounted around an axis, comprising a number of blades arranged at the rotor device, whereby the rotor device comprising at least one loose balance piston mounted at a first portion of the peripheral surface of the rotor device.
  • the core of the invention is that the balance piston is a loose balance piston which is mounted or mountable at the rotor device or at a first portion of the peripheral surface of the rotor device, respectively.
  • a loose balance piston makes it possible to mount at first a one-piece inner casing over the shaft end of the rotor device and after that to mount the loose balance piston over the shaft end of the rotor device.
  • the loose balance piston is not part of the rotor forging.
  • the loose balance piston allows mounting an inner casing without a split plane. Further the loose balance piston enables to take out a lot of power from the turbine because the loose balance piston can have large outer diameters.
  • a large loose balance piston allows to use small axial bearings, because a large loose balance piston can take out higher axial forces from the turbine blading. That means, by using a large loose balance piston, high axial forces from the turbine blading can be taken out without increasing the load on the axial bearings.
  • the balance piston is arranged at a first portion of the rotor device so that some high pressure steam is introduced on the low pressure side to push the other way. This takes load off of the thrust axial bearing.
  • a loose balance piston that can be mounted after the inner casing makes it possible to choose exactly the diameter and the size of the loose balance piston that is needed to balance the axial force from the blading. It is easy to replace the loose balance piston against a loose balance piston with a smaller or larger outer diameter or with a smaller or larger size.
  • the outer diameter of the loose balance piston can be diversified.
  • the rotor device comprises a second portion being constructed to receive an inner casing having a steam inlet of said steam turbine, whereby the diameter of the second portion of the peripheral surface of the rotor device is larger than the diameter of the first portion of the peripheral surface of the rotor device.
  • the diameter of the second portion of the peripheral surface of the rotor device is equal to the diameter of the inner casing. Therefore the inner casing including a steam inlet can be mounted over the shaft end of the rotor device and over the first portion of the peripheral surface of the rotor device.
  • a rotor device whereby the second portion of the peripheral surface is part of the rotor device or is a circumferential restraint for receiving the inner casing, whereby the restraint is arranged at the peripheral surface of the rotor device.
  • Essential is that the inner diameter of the inner casing is larger than the diameter of the first portion of the peripheral surface of the rotor device, where the loose balance piston can be mounted. That makes it possible that the inner casing can be mounted in one piece over the shaft end and over the first portion of the rotor device.
  • the diameter of the second portion has to be larger than the diameter of the first portion of the peripheral surface of the rotor device. Otherwise the inner casing can't be mounted over the first portion of the peripheral surface of the rotor device. If the second portion of the peripheral surface is a circumferential restraint for receiving the inner casing, whereby the restraint is arranged at the peripheral surface of the rotor device, the diameter of the circumferential restraint has to be larger than the diameter of the first portion of the peripheral surface of the rotor devices.
  • a rotor device whereby the peripheral surface of the loose balance piston is arranged at a portion of the inner casing of said steam turbine.
  • the loose balance piston of the rotor device has preferably a bajonet locking.
  • a steam turbine comprising a rotor device according to the before described first aspect of the invention, an inner casing mounted at the second portion of the peripheral surface of the rotor device or at the circumferential restraint, whereby the inner casing has a steam inlet, an outer casing and axial bearings for bearing the rotor device in the inner and/or outer casing.
  • This steam turbine can manage high axial forces caused by the blades mounted at the rotor device.
  • the steam turbine makes it further possible to use an inner casing which is been built in one piece.
  • the axial bearing can have small or normal sizes, because of the possibility to mount a large loose balance piston.
  • a large loose balance piston takes load off of the axial bearing.
  • a large loose balance piston can manage better the pressure of both sides of the balance piston than a small balance piston.
  • a steam turbine that is characterized in that the inner casing comprising the steam inlet is formed in one piece. Further a steam turbine is preferred, whereby the inner diameter of the loose balance piston is smaller than the inner diameter of the inner casing.
  • the steam turbine is preferably a low-pressure steam turbine.
  • Fig. 1 shows a rotor device 1 comprising a mounted loose balance piston 7 and a mounted one-piece inner casing 5 having a steam inlet 6.
  • the rotor device 1 is rotatably mounted around an axis 2.
  • the rotor device 1 comprises a number of blades or bladings 3 arranged at the rotor device 1.
  • the rotor device 1 comprises a second portion 4 of the peripheral surface of the rotor device 1 being constructed to receive the inner casing 5 of a steam turbine.
  • the loose balance piston 7 is mounted at a first portion 8 of the peripheral surface of the rotor device 1, whereby the diameter of the second portion 4 of the peripheral surface of the rotor device 1 is larger than the diameter of the first portion 8 of the peripheral surface of the rotor device 1.
  • the loose balance piston 7 makes it possible to mount at first a one-piece inner casing 5 over the shaft end of the rotor device 1 and after that to mount the loose balance piston 7 over the shaft end of the rotor device 1. Therefore the loose balance piston 7 is not part of the rotor forging.
  • the loose balance piston 7 allows mounting an inner casing 5 without a split plane. Further the loose balance piston 7 allows using a small axial bearing 10, because the large loose balance piston 7 can take out higher axial forces from the turbine blading 3. The large loose balance piston 7 can take out high axial forces from the turbine blading 3 without increasing the load on the axial bearing 10.
  • the balance piston 7 is arranged on a first portion 8 of the rotor device 1 so that some high pressure steam is introduced on the low pressure side to push the other way. This takes load off of the thrust axial bearing 10.
  • the second portion 4 of the peripheral surface is not part of the rotor device 1, but is a circumferential restraint 9 for receiving the inner casing 5, whereby the circumferential restraint 9 is arranged at the peripheral surface of the rotor device 1.
  • Essential is that the inner diameter of the inner casing 5 and the diameter of the circumferential restraint 9 are larger than the diameter of the first portion 8 of the peripheral surface of the rotor device 1, where the loose balance piston 7 is mounted. That makes it possible that the inner casing 5 can be mounted in one piece over the shaft end of the rotor device 1.
  • the rotor device 1 shows further a coupling flange 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP08020581A 2008-11-26 2008-11-26 Rotorvorrichtung für eine Dampfturbine und Dampfturbine Withdrawn EP2192266A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08020581A EP2192266A1 (de) 2008-11-26 2008-11-26 Rotorvorrichtung für eine Dampfturbine und Dampfturbine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08020581A EP2192266A1 (de) 2008-11-26 2008-11-26 Rotorvorrichtung für eine Dampfturbine und Dampfturbine

Publications (1)

Publication Number Publication Date
EP2192266A1 true EP2192266A1 (de) 2010-06-02

Family

ID=40875140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08020581A Withdrawn EP2192266A1 (de) 2008-11-26 2008-11-26 Rotorvorrichtung für eine Dampfturbine und Dampfturbine

Country Status (1)

Country Link
EP (1) EP2192266A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109184823A (zh) * 2018-11-06 2019-01-11 上海电气电站设备有限公司 一种具有补汽结构的汽轮机及其运行方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1344193A (en) * 1918-09-05 1920-06-22 Allis Chalmers Mfg Co Balancing device
DE406365C (de) * 1923-04-20 1924-11-22 C H Jaeger & Co Pumpen Und Geb Achsschub-Ausgleichvorrichtung fuer Dampfturbinen, Turbinengeblaese und aehnliche Maschinen
EP1035301A1 (de) * 1999-03-08 2000-09-13 Asea Brown Boveri AG Ausgleichskolben für den axialen Schubausgleich einer Welle von einer Turbine
US6213710B1 (en) * 1996-04-11 2001-04-10 Siemens Aktiengesellschaft Method and apparatus for thrust compensation on a turbomachine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1344193A (en) * 1918-09-05 1920-06-22 Allis Chalmers Mfg Co Balancing device
DE406365C (de) * 1923-04-20 1924-11-22 C H Jaeger & Co Pumpen Und Geb Achsschub-Ausgleichvorrichtung fuer Dampfturbinen, Turbinengeblaese und aehnliche Maschinen
US6213710B1 (en) * 1996-04-11 2001-04-10 Siemens Aktiengesellschaft Method and apparatus for thrust compensation on a turbomachine
EP1035301A1 (de) * 1999-03-08 2000-09-13 Asea Brown Boveri AG Ausgleichskolben für den axialen Schubausgleich einer Welle von einer Turbine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109184823A (zh) * 2018-11-06 2019-01-11 上海电气电站设备有限公司 一种具有补汽结构的汽轮机及其运行方法
CN109184823B (zh) * 2018-11-06 2024-03-19 上海电气电站设备有限公司 一种具有补汽结构的汽轮机及其运行方法

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