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EP1922471A1 - Systeme de retenue axiale de d'aubes mobiles dans un rotor et utilisation dudit systeme - Google Patents

Systeme de retenue axiale de d'aubes mobiles dans un rotor et utilisation dudit systeme

Info

Publication number
EP1922471A1
EP1922471A1 EP06778300A EP06778300A EP1922471A1 EP 1922471 A1 EP1922471 A1 EP 1922471A1 EP 06778300 A EP06778300 A EP 06778300A EP 06778300 A EP06778300 A EP 06778300A EP 1922471 A1 EP1922471 A1 EP 1922471A1
Authority
EP
European Patent Office
Prior art keywords
securing
arrangement
metal strip
sealing element
rotor
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Withdrawn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
EP06778300A
Other languages
German (de)
English (en)
Inventor
Dieter Brillert
Harald Hoell
Armin Hülfenhaus
Claus VÖGELIN
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
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of EP1922471A1 publication Critical patent/EP1922471A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
    • F01D5/3015—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type with side plates
    • 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
    • F05D2250/70—Shape
    • 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 relates to an arrangement for axial securing of rotor blades in a rotor, with a shaft collar, extending on the outer circumference in the axial direction of the rotor
  • Blade holding grooves are provided, in each of which blades are arranged with the blade holding groove corresponding blade feet, with a arranged on a front side surface of the shaft collar, in the region of the retaining projection in which a radially outwardly open circumferential groove is provided, wherein for axial securing the Laufschaufein respectively in the circumferential groove engaging sheet-like sealing elements are provided, which form a frontal sealing ring in the circumferential direction, wherein for securing the sealing elements against displacement in the circumferential direction of at least one of the sealing elements comprises a sheet metal strip attached thereto. Furthermore, the invention relates to the use of such an arrangement and a sealing element with a metal strip attached thereto.
  • Each sealing plate 16 is provided at its radially inner end 18 in a groove 20 provided on the front side of a rotor disk 19 inserted and at its radially outer end 22 in a securing groove 24 which is provided on the underside 26 of a platform 28 of the rotor blade 14.
  • a rectilinear sheet metal strip 30 is fixed to each, which extends substantially in the radial direction of the rotor 23.
  • Each sheet metal strip 30 terminates at its radially outer end 32 in a uniform converging point 34.
  • chamfered edges 36 are present, with two opposing
  • Edges 36 of immediately adjacent blades 14 form a tapered recess 38 into which the tip 34 of the sheet metal strip 30 can protrude to secure the sealing plate 16 against displacement in the circumferential direction U and can rest.
  • the sealing plates 16 also provide for a separation of two areas 37, 39, in which on the one hand cooling air and on the other hand, an undesirable hot gas flow can occur.
  • two parallel slots 40 are provided in the latter, through which the already U-shaped pre-bent sheet metal strip 30 is used.
  • the tip 34 opposite end 41 of the sheet metal strip 30 is bent before the assembly of the sealing plate 16 on the rotor disk 19 in the position shown in FIG 2 for fixing the sheet metal strip 30.
  • the sealing plates 16 are successively threaded with the pre-assembled metal strip 30 in the endless circumferential, arranged on the rotor disk 19 groove 20 and arranged in the bottom 26 of the platform 28 securing groove 24.
  • the sealing sheets 16 are positioned along the circumference of the groove 20 so that each sheet metal strip 30 faces a recess 38. Subsequently, the tips 34 of the sheet metal stiffeners 30 are bent into the recesses 38 to to exclude a displacement of the sealing plates 16 in the circumferential direction U.
  • the invention proposes that the metal strip is formed along its extension substantially L-shaped, with its first extending in the circumferential direction leg is attached to the sealing element and its second radially inwardly extending legs engages in a security pocket, which security pocket in the frontal Area of the shaft collar is provided.
  • the invention thus turns away from the previous solution, in which a displacement of the sealing elements in the circumferential direction by the abutment of the sheet metal strips on the blades, i. is prevented in the region of the radially outer end of the sealing element.
  • the invention proposes that the sheet-metal strip engages in a securing pocket, which is now radially inward with respect to the sealing element and is provided on the side surface or end face of the shaft collar.
  • the invention is based on the finding that, if only the security pocket would have been displaced from radially outward to radially inward, while retaining a rectilinear sheet-metal strip, the sheet-metal strip would become inoperative due to the centrifugal force acting on it
  • the metal strip will not more as previously formed rectilinear, but it has in a plane substantially parallel to the sheet-like sealing element level a cranked shape in the manner of an L with two legs.
  • a first, in the circumferential direction extending leg of the metal strip is attached to the sealing element, for example in a known manner and its second, in the radial direction inwardly extending leg engages in the mounted position in the provided on the side surface of the shaft collar fuse pocket. Due to the bent portion of the metal strip between the two rectilinear legs a centrifugal force-induced bending of the metal strip during operation of the gas turbine is effectively and reliably prevented.
  • the sealing elements are to be moved in the circumferential direction and to bend the metal strip accordingly during assembly in the security pocket or during disassembly from the security pocket.
  • each cranked sheet metal strip sits, compared with the known from the prior art metal strip, at a less critical for the sealing elements body and thus improve the buckling behavior of the sealing element.
  • the temperature occurring during operation of the gas turbine at the sealing element also decreases with decreasing radius, which is mainly due to the lower hot gas inlet at this point. Since the metal strips are now provided on the inner radius, and not as previously on the outer radius of the sealing element, they are in an advantageous Manner also subjected to a lower temperature. This leads to an increased and improved rigidity of the metal strip and to an increased life.
  • the construction allows the reuse of the sealing elements after use and then disassembly, in which case only the metal strips are to be renewed.
  • a further advantage of the article according to the invention is that each blade can only be secured by a sealing element assigned to it, so that when replacing a single blade of the blade ring, only one sealing element now has to be removed and not two sealing sheets, as in the closest prior art. This reduces the duration of maintenance and service life of the gas turbine equipped therewith.
  • each sealing element has a metal strip with identical sheet metal strip for protection against its displacement in the circumferential direction.
  • the sealing ring formed by all sealing elements is secured at a plurality of circumferentially distributed positions against displacement in the circumferential direction.
  • the side regions of the second leg of each sheet metal strip abut against the respective radially extending side walls of the security pocket, which represents an effective measure against displacement of the sealing elements in the circumferential direction.
  • the groove running around the end face, in which the sealing elements are held radially inward is arranged radially further in relation to the blade retaining grooves.
  • the security pocket which is provided on the side surface of the shaft collar, formed by two frontally arranged, radially outwardly extending and spaced teeth.
  • the sealing element is securely fixed and positioned at two radially spaced points.
  • the shaft collar is formed by a rotor disk.
  • the frontally circumferential groove is arranged radially in height of the blade holding grooves. Radially further inside another further outwardly open groove is provided, wherein the sealing element engages in both grooves and also bears against the end of the blade frontally.
  • Displacement of the blade in the axial direction occurring force can be reliably compensated by the sealing element.
  • the object directed to the sealing element is achieved by the features of claim 9.
  • the resulting advantages for the sealing element correspond to the advantages of the arrangement.
  • the described arrangement is used in an axially permeable, stationary gas turbine whose rotor blades are each secured by sealing elements against an axial displacement.
  • Blades in a rotor according to the prior
  • FIG 2 shows the cross-sectional view of FIG 1 along the section line II-II
  • FIG. 4 shows, in an alternative embodiment, a further sealing element according to the invention
  • FIG. 3 shows a section of the frontal plan view of the shaft collar 21 formed by a rotor disk 21 of a rotor 23 of a gas turbine.
  • the rotatable about the axis of rotation 50 rotor 23 has distributed on its outer circumference 52 over the circumference U, extending in the axial direction blade holding grooves 12, in each of which a blade 14 with the blade holding groove 12 corresponds executed blade root 54 can be inserted.
  • Blade holding groove 12 is already a blade 14 is inserted.
  • an axially extending projection 58 or widening with a circumferential groove 20 open radially outwards is arranged on an end face of the rotor disk 19 or on a front side surface 56 of the shaft collar 21.
  • the groove 20 is, for example, arranged radially further inwardly than the blade retaining grooves 12.
  • the rotor blade 14 has a platform arranged between the blade root 54 and profiled blade 28, on the underside of which an open groove 20 is provided for the locking groove 24, while being opposite this.
  • a sealing element 42 is inserted into the endless circumferential groove 20 and into the securing groove 24 which secures the blade 14 against displacement along the blade retaining groove.
  • each sealing element 42 completely covers the end opening of one of the blade retaining grooves 12 and thus secures the relevant blade 14 against displacement along the blade retaining groove 12.
  • sealing elements 42 can also be distributed over the circumference, as in the prior art, such that each sealing element 42 secures one of the rotor blades 14 with one half.
  • a fully assembled ring of sealing elements 42 forms a sealing ring which separates a region 37 through which a coolant can flow from a further region 39 into which a hot gas may possibly occur.
  • this includes one Sheet metal strip 60.
  • the sheet metal strip 60 is preferably provided at the inner end 61 of the sealing element 42 and fastened to the sealing element 42 in the same manner as in the prior art. In departure from the prior art, however, extend the necessary, provided in the sealing element 42 slots 40 in the radial direction.
  • the guided through these slots 40 and thus entangled with the sealing element 42 sheet metal strip 60 is cranked and formed substantially L-shaped, provided that the sheet metal strip 60 is considered in a plane substantially parallel to the sheet-like sealing element 42 level.
  • it has a first, in the circumferential direction U of the rotor 23 extending leg 62, with which the metal strip 60 is attached to the sealing element 42.
  • Sheet metal strip 60 engages in a security pocket 66, which securing pocket 66 is provided on the side surface 56 of the shaft collar 21. Due to the cranked shape of the metal strip 60 and its relatively short second leg 64 may be a bending of the
  • the fuse pocket 66 is formed by two spaced apart teeth 68 which project radially outwardly at the outer edge of the projection 58.
  • the security bag could also be formed by a recess 69, with a corresponding length of the second leg 64th
  • the sealing element 42 according to the invention is reliably secured against displacement in the circumferential direction U.
  • every second sealing element or even each sealing element of the sealing ring with a metal strip 60 against displacement along the groove 20th be assured.
  • FIG. 4 shows in an alternative embodiment, the frontally circumferential groove 20 radially in height of the blade retaining grooves 12.
  • Radially further inside a further outwardly open groove 70 is provided in a region adjacent to the shaft collar 21, for example in an adjacent rotor disc 72.
  • the sealing element 42 is inserted into the inner groove 70 and has on its side facing the shaft collar a hook 71 which engages in the outer groove 20. It lies with its outer end 75 at the foot 73 and / or at the neck of the blade 14 at the front.
  • the distance between the groove 20 and the system of the sealing element 42 at the foot 73 is substantially smaller than the distance of the groove 20 to the further groove 70.
  • the of the displacement of the rotor blade 14 in the axial direction The force acting on the sealing element 42 thus acts over a short distance or lever to the "pivot point" in the region of the groove 20.
  • the long distance or lever is provided, which is also locally thickened for stiffening in section 74.
  • the sealing element 42 is secured in a manner analogous to the embodiment shown in Figure 3 against displacement in the circumferential direction, wherein the
  • Teeth for reinforcing the end region of the shaft collar 21 are provided on the adjacent rotor disc 72.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Gasket Seals (AREA)

Abstract

Système (10) de retenue axiale d'aubes mobiles (14) dans un rotor, pourvu d'un collet d'arbre (21) sur la périphérie externe (52) duquel sont ménagées des rainures de retenue (12) des aubes mobiles dans le sens axial du rotor. Une partie saillante dans laquelle est ménagée une rainure périphérique (20) ouverte radialement vers l'extérieur est située sur une surface latérale (56) du collet d'arbre (21), dans la zone des rainures de retenue. Ledit système comporte en outre des rainures de retenue (24) ménagées dans chaque aube mobile (14). Des éléments d'étanchéité (42) en tôle emboîtés dans la rainure périphérique (20) et dans la rainure de retenue (24) servent à la retenue axiale des aubes mobiles (14) et forment dans le sens périphérique (U) une bague d'étanchéité avant. Pour retenir les éléments d'étanchéité (42) contre un déplacement dans le sens périphérique (U), au moins un des éléments d'étanchéité (42) comporte une pâte en tôle (60) fixée à cet élément d'étanchéité. Selon la présente invention, les pâtes en tôle (60) fixées sur l'extrémité radiale interne de l'élément d'étanchéité (42) possèdent une forme de L et reposent sur le disque de rotor (19).
EP06778300A 2005-09-07 2006-08-21 Systeme de retenue axiale de d'aubes mobiles dans un rotor et utilisation dudit systeme Withdrawn EP1922471A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005042597 2005-09-07
PCT/EP2006/065512 WO2007028703A1 (fr) 2005-09-07 2006-08-21 Systeme de retenue axiale de d'aubes mobiles dans un rotor et utilisation dudit systeme

Publications (1)

Publication Number Publication Date
EP1922471A1 true EP1922471A1 (fr) 2008-05-21

Family

ID=37309039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06778300A Withdrawn EP1922471A1 (fr) 2005-09-07 2006-08-21 Systeme de retenue axiale de d'aubes mobiles dans un rotor et utilisation dudit systeme

Country Status (6)

Country Link
US (1) US8105041B2 (fr)
EP (1) EP1922471A1 (fr)
JP (1) JP4646159B2 (fr)
CN (1) CN101258305B (fr)
RU (1) RU2413073C2 (fr)
WO (1) WO2007028703A1 (fr)

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Also Published As

Publication number Publication date
US20090116965A1 (en) 2009-05-07
CN101258305B (zh) 2011-06-15
RU2413073C2 (ru) 2011-02-27
JP4646159B2 (ja) 2011-03-09
US8105041B2 (en) 2012-01-31
RU2008113196A (ru) 2009-10-20
JP2009507176A (ja) 2009-02-19
WO2007028703A1 (fr) 2007-03-15
CN101258305A (zh) 2008-09-03

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