EP2691608B1 - Device and method for securing cover bands to stator blades - Google Patents

Device and method for securing cover bands to stator blades Download PDF

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Publication number
EP2691608B1
EP2691608B1 EP11793493.5A EP11793493A EP2691608B1 EP 2691608 B1 EP2691608 B1 EP 2691608B1 EP 11793493 A EP11793493 A EP 11793493A EP 2691608 B1 EP2691608 B1 EP 2691608B1
Authority
EP
European Patent Office
Prior art keywords
blade
cover
ring
segments
solid surface
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.)
Not-in-force
Application number
EP11793493.5A
Other languages
German (de)
French (fr)
Other versions
EP2691608A1 (en
Inventor
Vlastimil Sedlacek
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PL11793493T priority Critical patent/PL2691608T3/en
Publication of EP2691608A1 publication Critical patent/EP2691608A1/en
Application granted granted Critical
Publication of EP2691608B1 publication Critical patent/EP2691608B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • F01D9/042—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators
    • F01D9/044—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators permanently, e.g. by welding, brazing, casting or the like
    • 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
    • F01D25/285—Temporary support structures, e.g. for testing, assembling, installing, repairing; Assembly methods using such structures
    • 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
    • F01D5/225—Blade-to-blade connections, e.g. for damping vibrations by shrouding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/90—Mounting on supporting structures or systems
    • F05B2240/91—Mounting on supporting structures or systems on a stationary structure
    • F05B2240/916—Mounting on supporting structures or systems on a stationary structure with provision for hoisting onto the structure
    • 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
    • F05D2230/50—Building or constructing in particular ways
    • 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
    • F05D2230/68—Assembly methods using auxiliary equipment for lifting or holding
    • 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
    • F05D2250/00—Geometry
    • F05D2250/30—Arrangement of components
    • F05D2250/31—Arrangement of components according to the direction of their main axis or their axis of rotation
    • F05D2250/313—Arrangement of components according to the direction of their main axis or their axis of rotation the axes being perpendicular to each other
    • 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
    • F05D2250/00—Geometry
    • F05D2250/30—Arrangement of components
    • F05D2250/35—Arrangement of components rotated
    • 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

Definitions

  • the invention involves a method for securing stator blade fixing covers and devices used for implementing the method.
  • stator ring blades are fixed with a cover along their internal diameter.
  • the cover is not attached to the blades during the manufacturing process as it is only fixed to the blades after inserting and fixing the stator ring in the turbine support where the stator rings are fixed firmly.
  • Protruding rivets on stator blades must be manually protracted onto the individual small cover parts according to actual condition of blades fitting so that drilling of the openings for placing the cover parts on the specified number of rivets is carried out according to it.
  • Such drilled openings are used for inserting the rivets located at the end of stator blades.
  • the opening and rivet tolerances are so small that some of the rivets have to be forced into the openings using a brute force while both the fixing rivet and the actual stator blades are damaged.
  • a device for implementing the method for securing the stator blade fixing covers is not known and the method is still being implemented using a combination of a number of procedures and devices, especially the hand held riveting hammer.
  • the disadvantages are prevented by the method for securing stator blade fixing covers while its principle lies in inserting blades in a blade ring freely without any fixing.
  • the outer ends of blades are inserted in the inner face of a blade ring.
  • the blade ring is located on rotating segments and side-secured by top segments. Rotating segments ensure support from the bottom of the ring and at the same time rotation of the ring.
  • Top segments are located in upper half of the blade ring.
  • Blade rivets are inserted in the cover one after another. Blade rivets are part of blades. Blade is made from one part of the material, rivet is on the top of the blade and it is part of the whole.
  • the entire blade ring is rotated using rotating segments to secure the next rivet, i.e. the entire ring is rotated so that next blade is in a position perpendicular to the solid surface again.
  • the procedure is applied until all blade rivets in a cover are secured.
  • the greatest advantage of the method for securing the stator blade fixing covers and implementing the method is the fact that it is a controlled riveting process where the power is applied accurately and the rivets are not overloaded. Riveting is always performed in the rivet axis. It achieves high accuracy allowing avoidance of the stator blade deformation when placing the actual cover on the rivets. Thanks to using the device for implementing the method, the worker is not exposed to strong vibrations during manual riveting and their health is not being damaged.
  • a device according to claim 2 for implementing the method for securing the stator blade fixing covers is also disclosed and consists of:
  • fig. 1 shows the device for implementation of securing the stator blade fixing covers seen from the front.
  • the method for securing stator blade fixing covers is carried out by blades 5 being freely inserted in a blade ring 4 without any fixing.
  • the actual blade ring 4 is located at the sides on rotating segments 6 and side-secured by top segments 7 , at the same time, its bottom side stands on a solid surface 2.
  • Rivets 8 of the blades 5 are inserted into a cover 3 , while the blade 5 is inserted in the blade ring 4 , so that it stands on the solid surface 2 .
  • the blade is secured in the cover 3 by securing the rivet 8 using a rivet head 1 .
  • the entire blade ring 4 is rotated using rotating segments 6 to secure the next rivet 8 . This method is applied until all the blades 5 are fixed in the cover 3 .
  • the device for implementing the method for securing the stator blade fixing covers is composed of a frame with rotating segments 6 and top segments 7 placed on it for fixing the blade ring 4 that always stands with the bottom perpendicularly inserted blade 5 on a solid surface 2.
  • the riveting head 1 is located in the internal circular cover 3 area.
  • the blade ring 4 is placed on rotating segments 6 and solid surface 2 . It is secured from side movement by top segments 7. Blades 5 are inserted into the blade ring in such a way that the rivets 8 are positioned towards the ring centre. Blade 5 rivets 8 prepared in such way are placed into the cover 3 openings prepared in advance. A riveting head 1 located in the internal area of the blade ring 4 and as a matter of fact in the internal area of the cover 3 , secures the rivet 8 causing its deformation hence fixing the cover to the blade 5 .
  • the blade 5 under such application is located on the solid surface 2 and, together with the blade ring 4 , it sits directly on it. Thus, the least dissipating energy transfer is used.
  • the entire blade ring is rotated using rotating segments 6 in such a way that the next blade can be secured. This is applied until all the blades are secured.
  • the blade ring 4 is removed and blades 5 are secured in the actual blade ring 4 .
  • the invention can be applied in the current spacing ring manufacturing allowing the production of ready-made spacing rings with fixed blades, including their covers.
  • the method developed is more effective, faster, as well as less costly financial-wise.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Manufacture Of Motors, Generators (AREA)

Description

    Technical Fields
  • The invention involves a method for securing stator blade fixing covers and devices used for implementing the method.
    • Background Arts
  • The stator ring blades are fixed with a cover along their internal diameter. The cover is not attached to the blades during the manufacturing process as it is only fixed to the blades after inserting and fixing the stator ring in the turbine support where the stator rings are fixed firmly. Protruding rivets on stator blades must be manually protracted onto the individual small cover parts according to actual condition of blades fitting so that drilling of the openings for placing the cover parts on the specified number of rivets is carried out according to it. Such drilled openings are used for inserting the rivets located at the end of stator blades. However, the opening and rivet tolerances are so small that some of the rivets have to be forced into the openings using a brute force while both the fixing rivet and the actual stator blades are damaged. When all the cover parts are fitted at the ends of stator blades with protruding rivets, a human factor and labour are needed with the following consequences: uncontrolled manual work characteristic for its high labour consumption, strong vibrations that negatively influence human organism, and primarily the inability to apply proper power on the rivets causing their overload and different heights of rivet heads that need to be lathed down to the same height.
  • A device for implementing the method for securing the stator blade fixing covers is not known and the method is still being implemented using a combination of a number of procedures and devices, especially the hand held riveting hammer.
  • As the general state of the prior art which is closest to the subject-matter of presented solution can be considered following documents: US 4137620 A , EP 0393567 A1 , US 4437213 A , US 2007/074554 A1 .
    • Disclosure of Invention
  • The disadvantages are prevented by the method for securing stator blade fixing covers while its principle lies in inserting blades in a blade ring freely without any fixing. The outer ends of blades are inserted in the inner face of a blade ring. The blade ring is located on rotating segments and side-secured by top segments. Rotating segments ensure support from the bottom of the ring and at the same time rotation of the ring. Top segments are located in upper half of the blade ring. Blade rivets are inserted in the cover one after another. Blade rivets are part of blades. Blade is made from one part of the material, rivet is on the top of the blade and it is part of the whole. The blade with its bottom part inserted in the blade ring, together with the blade ring, stands on a firm surface and is secured in a cover by clenching the rivet with a riveting head. When the securing is complete, the entire blade ring is rotated using rotating segments to secure the next rivet, i.e. the entire ring is rotated so that next blade is in a position perpendicular to the solid surface again. The procedure is applied until all blade rivets in a cover are secured.
  • The greatest advantage of the method for securing the stator blade fixing covers and implementing the method is the fact that it is a controlled riveting process where the power is applied accurately and the rivets are not overloaded. Riveting is always performed in the rivet axis. It achieves high accuracy allowing avoidance of the stator blade deformation when placing the actual cover on the rivets. Thanks to using the device for implementing the method, the worker is not exposed to strong vibrations during manual riveting and their health is not being damaged.
  • Disclosed herein is a method according to claim 1 for securing a stator blade fixing cover and consisting of these steps:
    1. 1. inserting stator blades into the blade ring without fixing in such a way that blade rivets are positioned towards the wheel center
    2. 2. placing the blade ring on rotating segments and on solid surface, and securing the blade ring from side movements by top segments
    3. 3. placing the blade rivets into cover openings prepared in advance
    4. 4. fixing the cover to the blade sitting directly on the solid surface together with the blade ring by securing the rivets using a riveting head located in the internal area of the cover
    5. 5. rotating the entire blade ring using rotating segments in such a way that next blade can be secured
    6. 6. applying such procedure until all blades are secured
    7. 7. removing the blade ring.
  • A device according to claim 2 for implementing the method for securing the stator blade fixing covers is also disclosed and consists of:
    • a frame
    • rotating segments whereon blade ring is placed
    • top segments to side-secure blade ring
    • a solid surface
    • a riveting head located in the internal circular are of the cover for fixing the cover to the blade sitting directly on the solid surface
    Brief Description of Drawings
  • The technical design will be further clarified by the drawing, where fig. 1 shows the device for implementation of securing the stator blade fixing covers seen from the front.
    • Mode for carrying out the invention Example 1
  • The method for securing stator blade fixing covers is carried out by blades 5 being freely inserted in a blade ring 4 without any fixing. The actual blade ring 4 is located at the sides on rotating segments 6 and side-secured by top segments 7, at the same time, its bottom side stands on a solid surface 2. Rivets 8 of the blades 5 are inserted into a cover 3, while the blade 5 is inserted in the blade ring 4, so that it stands on the solid surface 2. The blade is secured in the cover 3 by securing the rivet 8 using a rivet head 1. When the task is completed, the entire blade ring 4 is rotated using rotating segments 6 to secure the next rivet 8. This method is applied until all the blades 5 are fixed in the cover 3.
    • Example 2
  • The device for implementing the method for securing the stator blade fixing covers is composed of a frame with rotating segments 6 and top segments 7 placed on it for fixing the blade ring 4 that always stands with the bottom perpendicularly inserted blade 5 on a solid surface 2. The riveting head 1 is located in the internal circular cover 3 area.
    • Example 3
  • The blade ring 4 is placed on rotating segments 6 and solid surface 2. It is secured from side movement by top segments 7. Blades 5 are inserted into the blade ring in such a way that the rivets 8 are positioned towards the ring centre. Blade 5 rivets 8 prepared in such way are placed into the cover 3 openings prepared in advance. A riveting head 1 located in the internal area of the blade ring 4 and as a matter of fact in the internal area of the cover 3, secures the rivet 8 causing its deformation hence fixing the cover to the blade 5. The blade 5 under such application is located on the solid surface 2 and, together with the blade ring 4, it sits directly on it. Thus, the least dissipating energy transfer is used. Further, the entire blade ring is rotated using rotating segments 6 in such a way that the next blade can be secured. This is applied until all the blades are secured. When this process is complete, the blade ring 4 is removed and blades 5 are secured in the actual blade ring 4.
    • Industrial Application of the Invention
  • The invention can be applied in the current spacing ring manufacturing allowing the production of ready-made spacing rings with fixed blades, including their covers. Up until recently, the cover used to be fixed only after fitting the distance ring in the turbine while, from the prospective of handling during the tasks performance, this was grossly non-ergonomic and, in extreme cases, it could also lead to damaging the turbine being assembled. Thus, in comparison to the existing procedures, the method developed is more effective, faster, as well as less costly financial-wise.

Claims (2)

  1. Method for securing a stator blade fixing cover (3) characterized in that blades (5) are inserted in a blade ring (4) freely without fixing, after that the blade ring (4) is placed standing on rotating segments (6) and side-secured by top segments (7), its bottom side standing on a solid surface (2), then for the bottom blade (5) inserted in the blade ring (4) and standing on the solid surface (2), blade rivets (8) are inserted into a cover (3) and the blade (5) is secured in the cover (3) by securing rivets (8) using a riveting head (1), after that the rotating segments (6) perform a rotation of the entire blade ring to secure the next rivet (8), and such procedure is applied until all the blades (5) are fixed in the cover (3).
  2. Device for implementing the method for securing the stator blade fixing covers of claim 1, characterized in that it comprises a solid surface (2) and a frame with rotating segments (6) and top segments (7), configured so that, in use, a blade ring (4) can be placed standing on the rotating segments (6) and side-secured by the top segments (7) and the blade ring (4) always stands with the bottom perpendicularly inserted blade (5) standing on the solid surface (2), and a riveting head (1) located in the internal circular area of the cover (3) when in use for fixing the cover (3) to the blade (5) sitting directly on the solid surface (2).
EP11793493.5A 2011-03-31 2011-11-18 Device and method for securing cover bands to stator blades Not-in-force EP2691608B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11793493T PL2691608T3 (en) 2011-03-31 2011-11-18 Device and method for securing cover bands to stator blades

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ2011-181A CZ305366B6 (en) 2011-03-31 2011-03-31 Assembly method of turbine stator vanes, their locking by means of shroud and apparatus for making the same
PCT/IB2011/055191 WO2012131449A1 (en) 2011-03-31 2011-11-18 Device and method for securing cover bands to stator blades

Publications (2)

Publication Number Publication Date
EP2691608A1 EP2691608A1 (en) 2014-02-05
EP2691608B1 true EP2691608B1 (en) 2019-07-17

Family

ID=44351970

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11793493.5A Not-in-force EP2691608B1 (en) 2011-03-31 2011-11-18 Device and method for securing cover bands to stator blades

Country Status (6)

Country Link
EP (1) EP2691608B1 (en)
CN (1) CN102933796B (en)
BR (1) BR112012016716B1 (en)
CZ (1) CZ305366B6 (en)
PL (1) PL2691608T3 (en)
WO (1) WO2012131449A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6082285B2 (en) * 2013-03-14 2017-02-15 三菱日立パワーシステムズ株式会社 Method for removing / attaching stator blade ring, and auxiliary support device for stator blade segment used in this method
CN109372599B (en) * 2018-11-26 2021-03-16 东方电气集团东方汽轮机有限公司 Six-direction adjusting and supporting device for assembling stator component of steam turbine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH598882A5 (en) * 1976-10-14 1978-05-12 Bbc Brown Boveri & Cie
US4437213A (en) * 1982-08-19 1984-03-20 Transamerica Delaval Inc. Means for tenon-forming a shroud to a turbine rotor
DE3831692A1 (en) * 1988-09-17 1989-03-02 Bbc Brown Boveri & Cie Method for connecting the cover plate and/or foot piece on the one hand to the blade on the other by means of a brazing or jointing process
FR2646114B1 (en) * 1989-04-21 1994-04-08 Gec Alsthom Sa METHOD AND DEVICE FOR RIVETING A BANDAGE WITH FINS MOUNTS ON A ROTOR
US7034262B2 (en) * 2004-03-23 2006-04-25 General Electric Company Apparatus and methods for repairing tenons on turbine buckets
EP1724443A1 (en) * 2005-05-20 2006-11-22 ABB Turbo Systems AG Nozzle ring
US7389662B2 (en) * 2005-09-30 2008-06-24 General Electric Company Method and apparatus for self indexing portable automated tenon peening
US7771164B2 (en) * 2006-12-18 2010-08-10 General Electric Company Method and system for assembling a turbine engine
US20090220331A1 (en) * 2008-02-29 2009-09-03 General Electric Company Turbine nozzle with integral impingement blanket
US20100186415A1 (en) * 2009-01-23 2010-07-29 General Electric Company Turbulated aft-end liner assembly and related cooling method
CN201669367U (en) * 2010-05-07 2010-12-15 中国长江动力公司(集团) Disc type impeller riveting device

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
PL2691608T3 (en) 2020-02-28
BR112012016716A2 (en) 2018-06-05
CN102933796A (en) 2013-02-13
EP2691608A1 (en) 2014-02-05
BR112012016716B1 (en) 2020-11-10
CZ2011181A3 (en) 2011-08-10
WO2012131449A1 (en) 2012-10-04
CN102933796B (en) 2015-11-25
CZ305366B6 (en) 2015-08-19

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