EP1860280A1 - Dispositif de verrouillage d'une aube de turbine comprenant un élément de verrouillage - Google Patents

Dispositif de verrouillage d'une aube de turbine comprenant un élément de verrouillage Download PDF

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Publication number
EP1860280A1
EP1860280A1 EP06007453A EP06007453A EP1860280A1 EP 1860280 A1 EP1860280 A1 EP 1860280A1 EP 06007453 A EP06007453 A EP 06007453A EP 06007453 A EP06007453 A EP 06007453A EP 1860280 A1 EP1860280 A1 EP 1860280A1
Authority
EP
European Patent Office
Prior art keywords
rotor
blade root
locking
blocking
axial direction
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Withdrawn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
EP06007453A
Other languages
German (de)
English (en)
Inventor
Christoph Dr. Richter
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 EP06007453A priority Critical patent/EP1860280A1/fr
Publication of EP1860280A1 publication Critical patent/EP1860280A1/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Withdrawn legal-status Critical Current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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/323—Locking of axial insertion type blades by means of a key or the like parallel to the axis of the rotor
    • 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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/326—Locking of axial insertion type blades by other means
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/60—Assembly methods
    • F05D2230/64—Assembly methods using positioning or alignment devices for aligning or centring, e.g. pins

Definitions

  • the invention relates to a turbine for a thermal power plant comprising a rotor, at least one blade having a blade root engaging with the rotor via a groove / land connection, and a blocking element for blocking a relative movement between the blade root and the rotor in the axial direction of the rotor.
  • the turbine blades of turbines known in the art are often mounted axially on the turbine rotor.
  • the blade roots are to be secured radially and axially in their rotor grooves in order to hold the blade in the rotor groove and to prevent a shaking movement of the same during turning operation of the turbine.
  • Such a shaking movement leads to surface damage in the support flanks of the blade roots and their Nutzahntragflanken. This in turn leads to a shortened fatigue life of the affected components.
  • blade roots are e.g. secured by locking plates at the inlet and / or outlet of the blade roots axially in the corresponding rotor grooves. It is also known to use tangentially arranged, partially flattened and secured by the neighboring blade pins for axial locking. Furthermore, in previously known turbines and bent elements are used for axial securing, which absorb the transmitted axial force by bending. However, large axial forces between the turbine blade and the rotor can not be absorbed by such bending elements.
  • An object of the invention is to provide a turbine of the type mentioned, in which the securing of the blade in the axial direction relative to the turbine rotor is designed for receiving large axial forces.
  • This object is achieved according to the invention with a generic turbine, wherein in the blade root and the rotor is provided in each case a locking recess for receiving the blocking element such that the blocking element blocks a relative movement between the blade root and the rotor in the axial direction of the rotor under shear stress.
  • the locking recesses in the blade root and the rotor are thus designed to receive the blocking element in the axial direction of the rotor such that an axial relative movement between the blade root and the rotor would cause a shear stress of the blocking element.
  • shear a force directed parallel to an upper surface of a body acts on an upper portion of the body. If its base can not move, the upper surface of the same is moved relative to the base.
  • a shear stress means that one of the blocking recesses of the blade root and the rotor exerts a force parallel to this upper surface on the blocking element in an upper region of the blocking element, while the other blocking recess holds the base surface or a lower region of the blocking element ,
  • the shearing stress of the blocking element according to the invention makes it possible to absorb large axial forces between the blade root and the turbine rotor with a relatively small element. Furthermore, the axial securing can be realized with minimal parts expenditure and furthermore low demands on the precision of the required components and the recesses or grooves to be introduced into the rotor and the blade. Since the solution according to the invention is not a closing bucket solution, ie the same for all buckets of the series, it is possible to specifically remove and install individual buckets during service measures. Furthermore, no risk of cracking grooves must be provided in the inventive solution. Rather, the locking recess can be kept relatively flat in the rotor. In the prior art partially required deep cutouts in the rotor can be avoided. In addition, the inventive allows Solution a very cost-effective axial securing a blade root on the rotor.
  • the locking recesses in the blade root and the rotor are designed to receive the blocking element in a form-fitting manner at least in the axial direction of the rotor.
  • the blocking element is inserted in the axial direction in both the locking recess of the blade root and the locking recess of the rotor accurately, so that the locking element is held both by the locking recess of the blade root and the locking recess of the rotor in the axial direction.
  • the respective locking recess in the blade root and / or the rotor is designed as a radial depression with a profile, in particular having a circular segment.
  • the profile of the recess is adapted to receive a circular locking element in a locking position for blocking an axial relative movement between the blade root and the rotor.
  • the blocking element in the respective locking recess in the blade root and / or the rotor from a blade mounting position for mounting or dismounting of the blade root in a blocking position for blocking a in the axial direction the rotor takes place relative movement between the blade root and the rotor is displaceable.
  • the locking recesses are each designed with respect to the rotor as radial depressions, which have an elongated shape in a direction perpendicular to the radial extent.
  • the respective longitudinal extension of the locking recesses is directed transversely to the axial direction of the rotor.
  • the respective direction of the longitudinal extent concludes the SperrausEnglishept with the axial direction of extension of the rotor an angle of about 70 °.
  • the locking recesses at the ends of their longitudinal extent each have semicircular profiles for receiving a circular locking element in the two extreme positions, wherein the longitudinal sides of the locking recesses are designed to be rectilinear.
  • the respective blocking recess in the blade root and / or the rotor prefferably have a contact surface extending transversely to the axial direction of the rotor.
  • the blade root and / or the rotor has a locking recess extending in the axial direction of the rotor, in particular a locking groove, and a locking member guided in the locking recess.
  • the locking member is adapted for displacing the locking element into a locking position in the locking recesses of the blade root and the rotor, wherein the blocking element in the blocking position blocks a relative movement between the blade root and the rotor in the axial direction of the rotor.
  • the locking member is adapted to move the locking member from a blade mounting position for mounting or dismounting the blade root on the rotor in the locking position.
  • the blocking element is displaced in particular in the tangential direction with respect to the rotor.
  • the blade root can easily be mounted and dismounted on the rotor and thereupon the axial locking can be produced or released without difficulty by means of the blocking element.
  • the locking member is further configured to hold the locking member in the locked position.
  • the locking member is designed as a wedge piece.
  • the locking member during insertion of the same in the locking recess continuously moves the locking element in the direction of the locking position. If the locking element designed as a wedge piece is then inserted sufficiently far into the locking recess, the locking element is in the intended locking position.
  • the locking element is moved by means of a dedicated tool, such as a mandrel, in the locked position.
  • the locking member is rod-shaped, in particular designed as a wave wedge.
  • the wave wedge has along its longitudinal extent wave-shaped deviations in the radial direction with respect to the turbine rotor, in particular in such a way that a chain of leaf springs results (1 to n leaf springs).
  • the waves are pressed flat elastic.
  • the elastically flattened waves counteract slipping out of the wave wedge.
  • the locking member is designed as a curved wedge bar with waves, wherein the bending of the locking member is adapted to a possibly provided curved shape of the groove / web connection between the rotor and the blade root.
  • the locking member is bendable at its ends for securing against axial displacement of itself.
  • the locking member after insertion into the locking recess can be bent at its ends, preferably with respect to the turbine rotor radially inwardly and is thereby secured against axial displacement.
  • provided on the end faces of the rotor, in particular radially with respect to the rotor extending grooves for receiving the bent ends of the locking member. This reduces the erosion susceptibility of the bent ends. Since the axial securing of the blade according to the invention achieved over the shear piece is, must be secured by the bending of the locking member ends only the locking member against axial displacement.
  • the ends of the locking member are relatively thin, since the required securing force is small.
  • the bending of the relatively thin ends can be carried out without problems in terms of assembly. All recesses in the blade root are in low-stress areas.
  • the thickness of the locking member can be selected as low as possible and the blocking element can be arranged as close as possible to the outlet of the locking member from the rotor shaft.
  • the blade root and / or the rotor shaft has an unlocking recess, in particular a bore and / or a groove, which is designed to receive an unlocking tool, in particular a pin punch for pushing out the blocking element from a blocking position in the locking recesses of the blade root and the rotor ,
  • the blocking element blocks a relative movement between the blade root and the rotor in the axial direction of the rotor.
  • the blocking element can be moved by means of the unlocking tool from the blocking position into a blade mounting position for mounting or demounting the blade root. In this position of the locking element, the blade root can be removed from the rotor by a substantially axial displacement.
  • the Entriegelungsaussparung runs in a low-stress region of the blade root.
  • the ends of the locking member are first bent back and removed the same by expulsion.
  • About the Entriegelungsaussparung in low-stressed area of the blade root is then pushed with a flattened pin punch the locking element in the blade mounting position.
  • the shovel can be like slide over the locking element during installation and remove it along the groove / web connection.
  • FIG. 1 shows a portion of a turbine rotor 10 according to the invention in the region of a blade attachment groove 12.
  • the blade attachment groove 12 has fir tree profile, which is designed to receive a turbine blade with a fir-tree-shaped foot.
  • FIG. 2a shows a portion of such a blade root 18 inserted into the blade attachment groove 12.
  • the rotor and blade root may also have a dovetail-shaped profile.
  • the blade root 18 is inserted into the blade attachment groove 12 axially with respect to the rotor for mounting the turbine blade.
  • the blade root 18 along a straight or slightly curved path in a relation to the rotor axis pivoted by a small angle orientation in the Schaufelbefest Trentsnut 12th introduced.
  • FIGS. 1 and 2a there is a blocking element 16 arranged on a bottom region 14 of the blade attachment groove 12 in the assembly position shown in FIGS. 1 and 2a.
  • a radially outwardly facing shear piece 16a of the locking element 16 in the central region of the bottom portion 14 of the Schaufelbefest Trentsnut 12.
  • the locking member 16 has, in addition to the shear piece 16a on a perpendicularly extending bottom piece 16b.
  • the bottom piece 16b extends in the tangential direction with respect to the rotor 10 and is arranged in a locking groove 26b of the rotor 10 arranged in the bottom area 14 of the rotor 10.
  • the locking element 16 is arranged in the center position 10 of the Schaufelbefest onlysnut 12 shown in FIGS. 1 and 2a, with respect to the bottom portion 10 of the Schaufelbefest onlysnut 12, so that the shear piece 16a in one at the bottom of the blade root 18 centrally provided locking groove 26a of the blade root can be performed.
  • This position of the blocking element 16 is also referred to as a mounting position. If the blade root 18 is fully inserted into the Schaufelbefest Trent 12, the locking member 16 is moved by means of a dedicated tool, such as a mandrel according to FIGS.
  • a locking member 28 is inserted into a locking recess 26 composed of a locking groove 26a of the blade root and a locking groove 26b of the rotor 10.
  • the locking member 28 is designed as a wave wedge, as shown in FIG. 3.
  • the blocking element 16 according to FIGS. 2a and 2b is held on the right in the blocking recesses 20 and 22 of the rotor 10 and of the blade root 18.
  • the locking recess 20 of the rotor is designed as a radial recess with a semicircular side wall 24.
  • the semicircular side wall 24 has portions that are transverse to the axial direction of the rotor oriented abutment surfaces 24a and 24b for the shear piece 16a of the locking element 16 serve.
  • the corresponding locking recess 22 of the blade root 18 has an analogous profile to the profile of the locking recess 20, so that the locking element 16 is positively received by the locking recesses 20 and 22 when arranged in the locking position. In this position, the locking element 16 secures the blade root 18 against axial displacement relative to the rotor 10 by shear stress of the locking element 16.
  • the waves thereof Upon introduction of the formed as a wave wedge locking member 28, the waves thereof are pressed flat. Thereafter, wedge ends 28a and 28b of the locking member 28 are preferably bent radially inwardly to secure the locking member 28 itself against axial displacement.
  • the blade root 18 are removed again from the Schaufelbefest Trentsnut 12, first the wedge ends 28a and 28b of the locking member 28 are bent back and the locking member 28 removed by expulsion. With a pin punch, the blocking element 16 is then pushed back into the blade mounting position according to FIG. 2a via an unlocking recess 30 provided as a bore or groove in the low-stressed region of the blade root 18. The Entriegelungsaussparung 30 can be seen in Fig. 3. When the blade root 18 is removed, it again slides over the blocking element 16 as during installation and can then be removed from the blade fastening groove 12.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP06007453A 2006-04-07 2006-04-07 Dispositif de verrouillage d'une aube de turbine comprenant un élément de verrouillage Withdrawn EP1860280A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06007453A EP1860280A1 (fr) 2006-04-07 2006-04-07 Dispositif de verrouillage d'une aube de turbine comprenant un élément de verrouillage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06007453A EP1860280A1 (fr) 2006-04-07 2006-04-07 Dispositif de verrouillage d'une aube de turbine comprenant un élément de verrouillage

Publications (1)

Publication Number Publication Date
EP1860280A1 true EP1860280A1 (fr) 2007-11-28

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EP06007453A Withdrawn EP1860280A1 (fr) 2006-04-07 2006-04-07 Dispositif de verrouillage d'une aube de turbine comprenant un élément de verrouillage

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EP (1) EP1860280A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2386721A1 (fr) * 2010-05-14 2011-11-16 Siemens Aktiengesellschaft Dispositif de fixation pour pales de turbomachines pouvant s'écouler axialement et son procédé de fabrication
CN105525950A (zh) * 2011-06-09 2016-04-27 通用电气公司 涡轮机叶片锁定系统
EP3650652A1 (fr) * 2018-11-08 2020-05-13 Doosan Skoda Power S.r.o. Fixation d'aube de turbine avec pied en forme d'arbre au rotor de turbine avec cale déformable et élément de fixation

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953348A (en) * 1952-12-30 1960-09-20 Gen Motors Corp Blade fastenings
US2963271A (en) * 1956-07-19 1960-12-06 Gen Motors Corp Turbine blade locking
US3039740A (en) * 1959-11-27 1962-06-19 Gen Motors Corp Blade retainer
US3158353A (en) * 1962-07-16 1964-11-24 United Aircraft Canada Blade locking device for conical broached discs
US3295826A (en) * 1966-04-08 1967-01-03 Gen Motors Corp Blade lock
DE1811007A1 (de) * 1968-11-26 1970-06-04 Bbc Brown Boveri & Cie Vorrichtung zur Sicherung von in axialen Nuten einer Welle ?rmschluessig gehaltenen Laufschaufeln von Stroemungsmaschinen,insbesondere fuer Turbinen
US3986779A (en) * 1974-05-27 1976-10-19 Brown Boveri-Sulzer Turbomaschinen Aktiengesellschaft Locking device for releasably fastening parts to rotors of fluid flow machines
US4527952A (en) * 1981-06-12 1985-07-09 S.N.E.C.M.A. Device for locking a turbine rotor blade
EP0597586A1 (fr) * 1992-11-11 1994-05-18 ROLLS-ROYCE plc Montage d'aube pour turbomoteur à ventilateur caréné
EP0712995A1 (fr) * 1994-11-19 1996-05-22 ABB Management AG Rotor portant des aubes
US20050226729A1 (en) * 2004-04-07 2005-10-13 Joana Negulescu Locking device for turbine blades
EP1643082A1 (fr) * 2004-09-30 2006-04-05 Siemens Aktiengesellschaft Fixation d'aubes de turbine

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953348A (en) * 1952-12-30 1960-09-20 Gen Motors Corp Blade fastenings
US2963271A (en) * 1956-07-19 1960-12-06 Gen Motors Corp Turbine blade locking
US3039740A (en) * 1959-11-27 1962-06-19 Gen Motors Corp Blade retainer
US3158353A (en) * 1962-07-16 1964-11-24 United Aircraft Canada Blade locking device for conical broached discs
US3295826A (en) * 1966-04-08 1967-01-03 Gen Motors Corp Blade lock
DE1811007A1 (de) * 1968-11-26 1970-06-04 Bbc Brown Boveri & Cie Vorrichtung zur Sicherung von in axialen Nuten einer Welle ?rmschluessig gehaltenen Laufschaufeln von Stroemungsmaschinen,insbesondere fuer Turbinen
US3986779A (en) * 1974-05-27 1976-10-19 Brown Boveri-Sulzer Turbomaschinen Aktiengesellschaft Locking device for releasably fastening parts to rotors of fluid flow machines
US4527952A (en) * 1981-06-12 1985-07-09 S.N.E.C.M.A. Device for locking a turbine rotor blade
EP0597586A1 (fr) * 1992-11-11 1994-05-18 ROLLS-ROYCE plc Montage d'aube pour turbomoteur à ventilateur caréné
EP0712995A1 (fr) * 1994-11-19 1996-05-22 ABB Management AG Rotor portant des aubes
US20050226729A1 (en) * 2004-04-07 2005-10-13 Joana Negulescu Locking device for turbine blades
EP1643082A1 (fr) * 2004-09-30 2006-04-05 Siemens Aktiengesellschaft Fixation d'aubes de turbine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2386721A1 (fr) * 2010-05-14 2011-11-16 Siemens Aktiengesellschaft Dispositif de fixation pour pales de turbomachines pouvant s'écouler axialement et son procédé de fabrication
WO2011141514A1 (fr) * 2010-05-14 2011-11-17 Siemens Aktiengesellschaft Agencement de fixation pour aubes de turbomachines à circulation axiale et procédé de fabrication d'un tel agencement
CN105525950A (zh) * 2011-06-09 2016-04-27 通用电气公司 涡轮机叶片锁定系统
CN105525950B (zh) * 2011-06-09 2017-08-29 通用电气公司 涡轮机叶片锁定系统
EP3650652A1 (fr) * 2018-11-08 2020-05-13 Doosan Skoda Power S.r.o. Fixation d'aube de turbine avec pied en forme d'arbre au rotor de turbine avec cale déformable et élément de fixation

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