EP2573327A1 - Fil amortisseur, étage rotorique aubagé, turbine à vapeur et procédé de manufacture associés - Google Patents

Fil amortisseur, étage rotorique aubagé, turbine à vapeur et procédé de manufacture associés Download PDF

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Publication number
EP2573327A1
EP2573327A1 EP11182015A EP11182015A EP2573327A1 EP 2573327 A1 EP2573327 A1 EP 2573327A1 EP 11182015 A EP11182015 A EP 11182015A EP 11182015 A EP11182015 A EP 11182015A EP 2573327 A1 EP2573327 A1 EP 2573327A1
Authority
EP
European Patent Office
Prior art keywords
wire
damping
rotor blade
shroud
sleeve
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Withdrawn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
EP11182015A
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German (de)
English (en)
Inventor
Milan Korista
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 EP11182015A priority Critical patent/EP2573327A1/fr
Publication of EP2573327A1 publication Critical patent/EP2573327A1/fr
Withdrawn legal-status Critical Current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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
    • F01D5/24—Blade-to-blade connections, e.g. for damping vibrations using wire or the like

Definitions

  • the invention relates to a damping wire for vibration damping rotor blades of turbo machines, to a rotor blade stage, in particular a control stage of a turbo machine, to a steam turbine and to a method for producing a rotor blade stage.
  • the rotor blades of turbo machines are subject to very high mechanical loads. Owing to high rotational speeds enormous tensile stresses occur in the blade profile due to the centrifugal forces, and these lead to deformations, and in particular to a lengthening of the blades. Pressure differences on the rotor blades, in particular in the case of reaction stages, also generate a force that acts in the axial direction. These loads overlap with dynamic loads which result, by way of example, from a vibrational excitation.
  • the vibrational excitation can be produced, by way of example in the case of long low-pressure blades, from the periodic passing of adjacent components, such as by running past guide vanes.
  • a damping wire that extends in the circumferential direction by way of example is provided which is routinely constructed with a round cross-section and is inserted in a recess located in the circumferential direction of a closed shroud band.
  • the damping wire driven by the centrifugal force, does not remove itself from this recess it is customary to deform the shroud plates of the shroud group by means of a rolling process to the extent that the radially outer openings of the recess at least partially close and the damping wire is positively secured in the shroud band.
  • a damping wire assembly of this kind can be seen in Fig. 4 .
  • the damping wire rests on the components of the shroud band that close the recess and makes a movement of each individual rotor blade relative to the group of the blades difficult as a consequence of the frictional forces that occur between the damping wire and the inner wall of the recess that performs the closing.
  • the rolling process of the shroud band which closes the recess is extremely complex, however, and requires extensive knowledge of the plastic deformation behavior.
  • the damping wire is often damaged during the rolling process, such that it may break during subsequent operation. If the damping wire is broken somewhere, progressive destruction of the damping wire conventionally occurs and as a result it can no longer realize its damping property, whereby the entire rotor blade stage can subsequently be destroyed. This has fatal effects on the entire turbo machine.
  • the object is achieved by the features of independent claim 1.
  • the invention is achieved by the features of independent claim 5 and with respect to the turbine by the features of independent claim 6.
  • the invention is achieved by the features of independent claim 7.
  • damping wire for vibration damping rotor blade stages of turbo machines is characterized in that damping wire is constructed as a coaxial wire with an inner wire and at least one sleeve at least partially surrounding the inner wire.
  • the sleeve surrounding the inner wire can plastically deform during the rolling process, in which a positive connection is created between the shroud band and the damping wire, without the inner wire being damaged in the process.
  • the coaxial wire can be produced by different manufacturing methods, by way of example by cold forming, shrinking or by extrusion. There should be no welding (micro welding) of the inner wire or surrounding sleeve during production, so there can be a relative movement of the inner wire with respect to the sleeve surrounding it when shear stresses occur.
  • One embodiment of the invention provides that the sleeve surrounding the inner wire is slotted.
  • the slotted design of the surrounding sleeve makes production of the coaxial damping wire particularly simple and only low forces have to be applied to create a positive connection between the inner wire and the surrounding sleeve.
  • One embodiment of the invention provides that the slot in the surrounding sleeve runs parallel or spirally with respect to the damping wire axis. This ensures that the outer sleeve is evenly pressed onto the inner wire.
  • the steam turbine according to the invention is characterized in that the steam turbine comprises at least one rotor blade stage with a coaxial damping wire. Breakage of the damping wire is effectively prevented by the coaxial wire whereby the operational reliability of steam turbine is significantly increased.
  • the coaxial wire can be produced and positively connected to the shroud band in one step. This results in particularly simple, fast and cost-effective production of a rotor blade stage.
  • Fig. 1a shows a rotor blade stage 4 comprising a rotor 12 and a plurality of rotor blades 7 radially arranged over the circumference of the rotor 12 (of which only one is shown in the radial section).
  • the rotor blades 7 are positively connected by way of fork root connectors 13 to the rotor 12.
  • Each rotor blade 7 comprises at its outer end 8 a shroud band 9.
  • a recess 10 with a rolled collar 11 is arranged in the respective shroud band 9 in the circumferential direction.
  • the recesses 10 in the respective shroud bands 9 are constructed in such a way that in the assembled state all shroud bands 9 are located on a circular circumferential line.
  • a damping wire 1 is inserted in the recesses 10 and is positively connected by rolling of the rolled collar 11 to the respective shroud band 9. This ensures that the damping wire 1 cannot slide out of the recess 10 as a result of centrifugal forces. Owing to the centrifugal forces that occur during operation of the turbo machine the damping wire 1 rests on the components of the shroud band 9 that close the recess 10 and thereby makes a relative movement of the individual rotor blades 7 as a consequence of the frictional forces that occur between the damping wire 1 and the inner wall of the recess 10 that performs the closing difficult. This leads to vibration damping of the rotor blade stage 4.
  • Fig. 1b shows a detailed view of the damping wire 1.
  • the damping wire 1 is constructed as a coaxial wire and comprises an inner wire 2 and at least one sleeve 3 at least partially surrounding inner wire 2.
  • the damping wire 1 is designed in such a way that in the event of a shear force the inner wire 2 can carry out a relative movement with respect to the surrounding sleeve 3.
  • the surrounding sleeve 3 is used to be able to absorb the plastic deformation due to the rolling forces during rolling of the damping wire 1.
  • the inner wire 2 experiences no or only insignificant plastic deformation during rolling.
  • the damping wire 1 becomes damaged this does not immediately lead to destruction of the entire damping wire 1, instead the inner wire 2 can continue to assume a damping function.
  • the coaxial wire may be produced by way of example by extrusion, shrinking or other cold forming methods. No cold welding (micro welding) should occur in the process, so a relative movement of the inner wire 2 with respect to the surrounding sleeve 3 is ensured in any case.
  • Fig. 2a shows a second exemplary embodiment of a rotor blade stage 4.
  • the rotor blade stage 4 is substantially identical to exemplary embodiment 1, so reference is made to the description for Fig. 1 for the basic construction of rotor blade stage 4.
  • Exemplary embodiment 2 differs only in the construction of the damping wire 1.
  • the surrounding sleeve 3 is not completely closed but consists of a slotted sleeve 3, with the slot running parallel along the damping axis 6.
  • the coaxial wire can be produced more easily due to the slotted design of the surrounding sleeve 3 because such high forces are not required for connecting the inner wire 2 and outer sleeve 3.
  • the slot 5 is preferably arranged in such a way that it points radially outwards. This ensures that the surrounding sleeve 3 protects the inner wire 2 during the rolling process from plastic deformation or other external effects.
  • Fig. 2b shows a detailed view of the damping wire 1 with the slotted sleeve 3 surrounding it, wherein the slot 5 running parallel to the damping axis 6 can clearly be seen.
  • Fig. 3a shows a third exemplary embodiment of a rotor blade stage 4.
  • the basic construction and the mode of operation are again identical to the preceding exemplary embodiments, so reference is made to the description thereof.
  • Exemplary embodiment 3 differs only in the construction of the damping wire 1.
  • the surrounding sleeve 3 is again of slotted design, with the slot running spirally along the damping wire axis 6.
  • the slotted embodiment of the surrounding sleeve 3 again allows simple production of the coaxial damping wire 1.
  • the spiral design of the slot 5 can be seen in the detailed view in Fig. 3B .
  • a method for producing a rotor blade stage 4 with damping wire 1 shall be described hereinafter using Fig. 4a to 4c .
  • the method described below is a particularly simple production method for such a rotor blade stage 4.
  • the rotor blades 7 comprise at their respective outer end 8 shroud bands 9 with recesses 10 arranged in the circumferential direction.
  • the recesses 10 include a rolled collar 11 which is firstly constructed in such a way that recess 10 is wide open and the insertion of a blank 14 for the surrounding sleeve 3 can be inserted ( Fig. 4a ).
  • the blank 14 has an open U-shaped profile ( Fig. 4b ).
  • the inner wire 2 of the coaxial wire is inserted in the surrounding sleeve 3 constructed as a blank 14 and the rolled collar 11 and the blank 14 are subsequently simultaneously rolled, so the blank 14 positively surrounds the inner wire and the rolled collar 11 in turn positively surrounds the coaxial wire ( Fig. 4c ).
  • the described method therefore allows simultaneous production of a coaxial wires and the positive connection of the coaxial wires to the respective shroud band of the rotor blade. Combining the two method steps results in a particularly efficient and inexpensive production method. Basically it is also possible to firstly produce the coaxial wire separately, then insert it in the recesses of the shroud bands and in a subsequent step positively connect the coaxial wire to the recess in a rolling method.
  • the damping wire according to the invention which is to be constructed as a coaxial wire with an inner wire and at least one sleeve at least partially surrounding the inner wire, effectively prevents damage, which occurs during rolling of the damping wire into the shroud band or damage which occurs during operation of the turbo machine, leading to destruction of the damping wire and therewith to failure of the damping effect.
  • the outer sleeve is used to absorb the plastic deformation that results during the rolling process. Furthermore it is used to keep the external effects due to distortions or other dynamic loads that occur away from the inner wire, so this substantially assumes only the damping property of the damping wire.
  • the damping wire according to the invention therefore contributes to significantly increased operational reliability. By using a damping wire of this kind a rotor blade stage with high operational reliability results which can be used in particular in control stages of turbo machines where increased requirements are made of the damping mechanisms.
  • the method according to the invention for producing a rotor blade stage with such a shroud band is characterized in that the coaxial damping wire is produced and can simultaneously be rolled into the shroud band in one production step.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP11182015A 2011-09-20 2011-09-20 Fil amortisseur, étage rotorique aubagé, turbine à vapeur et procédé de manufacture associés Withdrawn EP2573327A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11182015A EP2573327A1 (fr) 2011-09-20 2011-09-20 Fil amortisseur, étage rotorique aubagé, turbine à vapeur et procédé de manufacture associés

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11182015A EP2573327A1 (fr) 2011-09-20 2011-09-20 Fil amortisseur, étage rotorique aubagé, turbine à vapeur et procédé de manufacture associés

Publications (1)

Publication Number Publication Date
EP2573327A1 true EP2573327A1 (fr) 2013-03-27

Family

ID=44872179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11182015A Withdrawn EP2573327A1 (fr) 2011-09-20 2011-09-20 Fil amortisseur, étage rotorique aubagé, turbine à vapeur et procédé de manufacture associés

Country Status (1)

Country Link
EP (1) EP2573327A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103758579A (zh) * 2014-01-26 2014-04-30 中国船舶重工集团公司第七�三研究所 船用汽轮机自带冠叶片外包拉筋减振结构及其装配方法
CN106499446A (zh) * 2015-09-03 2017-03-15 通用电气公司 用于使相邻涡轮叶片减振的阻尼器销

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US856630A (en) * 1907-01-02 1907-06-11 Westinghouse Machine Co Turbine blade and vane.
US1856820A (en) * 1931-05-28 1932-05-03 Gen Electric Elastic fluid turbine
DE966503C (de) * 1953-12-12 1957-08-14 Siemens Ag Schaufelbindung fuer Dampf- oder Gasturbinen
GB898175A (en) * 1960-03-28 1962-06-06 Parsons & Marine Eng Turbine Improvements in and relating to the blading of turbines or like fluid flow machines
US3881844A (en) * 1974-05-28 1975-05-06 Gen Electric Blade platform vibration dampers
CH578679A5 (en) * 1974-05-31 1976-08-13 Bbc Sulzer Turbomaschinen Damping wire for turbine rotor blades - is held in blade wedging holes for making contact on rotation
DE2606891A1 (de) * 1975-03-12 1976-09-23 Stal Laval Turbin Ab Laufrad fuer eine axialturbine
JPS5554607A (en) * 1978-10-16 1980-04-22 Hitachi Ltd Blade connecting apparatus
US4268223A (en) * 1977-09-14 1981-05-19 Bbc Brown, Boveri & Co., Ltd. Vibration supression for turbine blades
JPS59108804A (ja) * 1982-12-15 1984-06-23 Toshiba Corp ル−ズタイワイヤ付タ−ビン羽根
JPS61291701A (ja) * 1985-06-17 1986-12-22 Toshiba Corp 動翼連結装置
US4699569A (en) * 1985-07-05 1987-10-13 Bbc Brown, Boveri & Company, Limited Rotor blade ring of an axial flow turbomachine
DE10219290A1 (de) * 2002-04-25 2003-11-06 Vattenfall Europe Generation Schwingungsdämpfung an freistehenden Schaufeln rotierender Strömungsmaschinen

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US856630A (en) * 1907-01-02 1907-06-11 Westinghouse Machine Co Turbine blade and vane.
US1856820A (en) * 1931-05-28 1932-05-03 Gen Electric Elastic fluid turbine
DE966503C (de) * 1953-12-12 1957-08-14 Siemens Ag Schaufelbindung fuer Dampf- oder Gasturbinen
GB898175A (en) * 1960-03-28 1962-06-06 Parsons & Marine Eng Turbine Improvements in and relating to the blading of turbines or like fluid flow machines
US3881844A (en) * 1974-05-28 1975-05-06 Gen Electric Blade platform vibration dampers
CH578679A5 (en) * 1974-05-31 1976-08-13 Bbc Sulzer Turbomaschinen Damping wire for turbine rotor blades - is held in blade wedging holes for making contact on rotation
DE2606891A1 (de) * 1975-03-12 1976-09-23 Stal Laval Turbin Ab Laufrad fuer eine axialturbine
US4268223A (en) * 1977-09-14 1981-05-19 Bbc Brown, Boveri & Co., Ltd. Vibration supression for turbine blades
JPS5554607A (en) * 1978-10-16 1980-04-22 Hitachi Ltd Blade connecting apparatus
JPS59108804A (ja) * 1982-12-15 1984-06-23 Toshiba Corp ル−ズタイワイヤ付タ−ビン羽根
JPS61291701A (ja) * 1985-06-17 1986-12-22 Toshiba Corp 動翼連結装置
US4699569A (en) * 1985-07-05 1987-10-13 Bbc Brown, Boveri & Company, Limited Rotor blade ring of an axial flow turbomachine
DE10219290A1 (de) * 2002-04-25 2003-11-06 Vattenfall Europe Generation Schwingungsdämpfung an freistehenden Schaufeln rotierender Strömungsmaschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103758579A (zh) * 2014-01-26 2014-04-30 中国船舶重工集团公司第七�三研究所 船用汽轮机自带冠叶片外包拉筋减振结构及其装配方法
CN103758579B (zh) * 2014-01-26 2015-12-02 中国船舶重工集团公司第七�三研究所 船用汽轮机自带冠叶片外包拉筋减振结构的装配方法
CN106499446A (zh) * 2015-09-03 2017-03-15 通用电气公司 用于使相邻涡轮叶片减振的阻尼器销

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