EP0699824A1 - Device for locking rotor blades and eliminating rotor imbalance in compressors or turbines of gas turbine engines - Google Patents

Device for locking rotor blades and eliminating rotor imbalance in compressors or turbines of gas turbine engines Download PDF

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Publication number
EP0699824A1
EP0699824A1 EP95112351A EP95112351A EP0699824A1 EP 0699824 A1 EP0699824 A1 EP 0699824A1 EP 95112351 A EP95112351 A EP 95112351A EP 95112351 A EP95112351 A EP 95112351A EP 0699824 A1 EP0699824 A1 EP 0699824A1
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EP
European Patent Office
Prior art keywords
securing element
axial
wedge
gap
shaped
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.)
Granted
Application number
EP95112351A
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German (de)
French (fr)
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EP0699824B1 (en
Inventor
Günther Schmidt
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.)
MTU Aero Engines GmbH
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MTU Motoren und Turbinen Union Muenchen GmbH
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Publication of EP0699824A1 publication Critical patent/EP0699824A1/en
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    • 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
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/027—Arrangements for balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/662—Balancing of rotors

Definitions

  • the invention relates to a device for fixing the rotor blades and eliminating rotor imbalances in axially flow-through compressors or turbines of gas turbine engines according to the preamble of claim 1.
  • a device for fixing the rotor blades and eliminating rotor imbalances in axially flow-through compressors or turbines of gas turbine engines according to the preamble of claim 1.
  • Such a device is known from DE-PS 4,300,773.
  • the known case deals with the simultaneous axial securing of the rotor blades and filler pieces via a locking plate, the full pieces being axially fixed radially below the locking plate in the axial gap between the foot end and groove base.
  • a filler piece is required for each axial groove, and if necessary one or more filler pieces can be exchanged for a filler piece with a specifically balanced balancing mass.
  • the known case presupposes a certain amount of installation play between the mutual contact surfaces of the foot-groove toothings, which in particular in combination with a radially outer cover band tensioning and support of the rotor blades causes problems in the elimination resulting from rotor imbalance; these problems on the mounted impeller result from the circumferential seating positions of the blades.
  • the disc imbalance resulting from the locally different or not precisely definable blade seat positions cannot be mastered even by multiple and often time-consuming balancing processes.
  • Rivet safeguards already proposed for the rotor blades on the impeller also have the aforementioned problems. They also have the disadvantage of high assembly and disassembly costs. There is also a risk of local damage to the blade feet and the wheel disc, especially when the rivet is loosened. Such rivets are often linked to structural changes, in particular on the wheel disk or on the axial grooves, which in turn can lead to problems with regard to the component strength of the wheel disk, which is extremely highly stressed on the radially outer circumference.
  • the invention has for its object to provide a device according to the above-mentioned and known type, which provides a practically backlash-free seat of the blades on the wheel disc with a simple and easy-to-assemble design when the blade safety device is mounted and which at the same time simplifies the removal of possible disc or. Rotor unbalance enabled.
  • each rotor blade is pressed with its foot-side contact or support surfaces against corresponding support surfaces of the axial groove in the wheel rim of the wheel disk in question. All blades are practically in a uniform static support and installation state, so that any unbalance or residual unbalance that may still be present on the disk can be clearly defined and compensated for. If there is a disc imbalance is present, the specific weight-balanced balancing mass in question can be fixed in an operationally reliable manner with respect to the securing element in the relevant recess on the blade root. With comparatively simple assembly and disassembly options, the blades and the securing element are secured to the wheel disk in the axial direction.
  • the radial gap height can be dimensioned so large, at least in the direction of a wheel rim or disc end face, that the balancing mass can initially be inserted into the recess on the blade root via the larger lateral gap opening and the securing element is wedged thereon.
  • the wedge-like jamming can also be carried out at least in the sense of the features according to claim 2 or 3.
  • An intensive and uniform surface pressure along the blade root which is as large and uniform as possible can be achieved in particular according to claim 4, according to which the axial gap and the securing element are designed to be essentially wedge-shaped in relation to one another with regard to the axially changing gap height profile.
  • the wedge-shaped course can be obtained from one-sided foot bevel relative to the axially parallel end surface of the groove base.
  • the securing element can be made comparatively light weight.
  • a rotor blade 1 is anchored with its multi-toothed blade root 2 to a correspondingly shaped axial groove E on the wheel rim 4, a wheel disc 5.
  • an axial gap S is left which, with regard to the installation height - as seen from left to right in FIG. 1 - is increasingly uniformly widening approximately in a wedge shape.
  • the wedge-shaped course of the axial gap S is e.g. characterized by the angle of inclination ⁇ , namely between the groove base G parallel to the disk and the tapered, radially inner end E of the blade root 2.
  • the tapered end E of the blade root 2 can e.g. be provided by a bevel cut.
  • the securing element 6 bridges, with a radially outer wall section, a recess 7, which is contained in the blade root 2 and is open on one side and is designed to accommodate a specifically balanced mass 8.
  • the securing element 6 is made from a sheet metal strip which is deformed at least in sections in a wedge shape.
  • This securing element can be manufactured, for example, by stamping or embossing processes. The latter applies in particular to the production of a sheet metal bead 9, which essentially provides the required wedge shape, so that the axial gap S and the securing element 6 are designed to be essentially wedge-shaped with respect to the gap height profile that changes axially on one side.
  • the securing element 6 sits on the groove base G with laterally straight-walled sections. Starting from the straight-walled sections, the securing element 6 is deformed into the sheet metal bead 9, so that - according to FIG. 2 - an approximately trapezoidal cross-section, which is partially open on one side with respect to the groove base G, is formed, which crosses the local end contour of the axial groove 3 at the axial gap S is designed to match.
  • the securing element 6 can have support sections St on both end regions of the axial gap S.
  • the support sections St between which the sheet metal bead 9 extends, can be provided by sheet metal sections bent at an angle to the straight-walled sections.
  • the securing element 6 contains axially open separating gaps or gaps at the ends, so that end parts E1, E2 projecting axially laterally axially from the support sections St can be bent radially in a flap-like manner around the securing element 6 and the relevant moving blade 1 axially on the wheel disk 5 via the blade root 2 to secure.
  • the invention can also be carried out without the mentioned support sections St, namely in combination of the wedge-shaped bead 9 with the end parts E1, E2 which can be bent over in the manner of a tab.
  • the securing element 6 ' has a contour which is rounded off to the radially inner axial groove contour.
  • the self-contained hollow profile contour of the securing element 6 ′′ is, for example, seen from top to bottom, tapered in a wedge shape to match the radially inner axial groove contour at the gap S.
  • solid profiles can be used for the securing elements at least to provide the respective wedge shape at the axial gap S, which, for example, are produced by rolling, forging or pressing processes.

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

Abstract

The equipment uses blades with tooth-like contours on their roots (2), which are anchored in corresponding axial grooves (3) in the rotor. A securing element (6) is arranged in an axial gap (S) between the end of the blade root and the base (G) of the axial groove. Each securing element has ends (E1,E2), which project out of gap between the blade and the disc, and which wedge it in the gap. It spans a recess (7), which is designed to accept a weight for balancing the rotor.

Description

Die Erfindung bezieht sich auf eine Einrichtung zur Laufschaufelfixierung und zur Beseitigung von Rotorunwuchten bei axial durchströmten Verdichtern oder Turbinen von Gasturbinentriebwerken gemäß Oberbegriff des Patentanspruchs 1. Eine derartige Einrichtung ist aus der DE-PS 4,300,773 bekannt. Der bekannte Fall behandelt die jeweils gleichzeitige axiale Sicherung der Laufschaufeln und von Füllstücken über ein Sicherungsblech, wobei die Fullstücke jeweils radial unterhalb des Sicherungsbleches im Axialspalt zwischen Fußende und Nutgrund axial festgelegt sind. Für jede Axialnut wird ein Füllstück erforderlich, wobei gegebenenfalls ein oder mehrere Füllstucke bedarfsweise in ein Füllstück mit einer spezifisch abgestimmten Wuchtmasse einwechselbar sind.The invention relates to a device for fixing the rotor blades and eliminating rotor imbalances in axially flow-through compressors or turbines of gas turbine engines according to the preamble of claim 1. Such a device is known from DE-PS 4,300,773. The known case deals with the simultaneous axial securing of the rotor blades and filler pieces via a locking plate, the full pieces being axially fixed radially below the locking plate in the axial gap between the foot end and groove base. A filler piece is required for each axial groove, and if necessary one or more filler pieces can be exchanged for a filler piece with a specifically balanced balancing mass.

Der bekannte Fall setzt ein gewisses Einbau-Spiel zwischen gegenseitigen Auflageflächen der Fuß-Nut-Verzahnungen voraus, wodurch sich insbesondere in Kombination mit einer radial äußeren Deckbandverspannung und-Abstützung der Laufschaufeln Probleme bei der Beseitigung von Rotorunwuchten ergeben; diese Probleme am montierten Laufrad resultieren aus am Umfang unterschiedlichen Sitzpositionen der Laufschaufeln. Die aus den örtlich unterschiedlichen bzw. nicht genau definierbaren Schaufelsitzpositionen resultierenden Scheibenunwuchten können selbst durch mehrfache und oft zeitraubende Wuchtvorgänge nicht beherrscht werden.The known case presupposes a certain amount of installation play between the mutual contact surfaces of the foot-groove toothings, which in particular in combination with a radially outer cover band tensioning and support of the rotor blades causes problems in the elimination resulting from rotor imbalance; these problems on the mounted impeller result from the circumferential seating positions of the blades. The disc imbalance resulting from the locally different or not precisely definable blade seat positions cannot be mastered even by multiple and often time-consuming balancing processes.

Schon vorgeschlagene Nietsicherungen für die Laufschaufeln am Laufrad sind ebenfalls mit der zuvor genannten Problematik behaftet. Sie haben ferner den Nachteil eines hohen Montage- und Demontageaufwands. Zudem besteht die Gefahr der örtlichen Beschädigung der Schaufelfüße und der Radscheibe, insbesondere beim Lösen der Vernietung. Auch sind derartige Vernietungen oftmals mit baulichen Veränderungen insbesondere an der Radscheibe bzw. an den Axialnuten verknüpft, woraus wiederum Probleme bezüglich der Bauteilfestigkeit der Radscheibe entstehen können, die am radial äußeren Umfang extrem hoch belastet ist.Rivet safeguards already proposed for the rotor blades on the impeller also have the aforementioned problems. They also have the disadvantage of high assembly and disassembly costs. There is also a risk of local damage to the blade feet and the wheel disc, especially when the rivet is loosened. Such rivets are often linked to structural changes, in particular on the wheel disk or on the axial grooves, which in turn can lead to problems with regard to the component strength of the wheel disk, which is extremely highly stressed on the radially outer circumference.

Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung nach der eingangs genannten und bekannten Art anzugeben, die bei montierter Schaufelsicherung einen praktisch spielfreien Sitz der Laufschaufeln an der Radscheibe bei einfacher und montagefreundlichen Bauweise bereitstellt und die zugleich einfachst die Beseitigung möglicher Scheiben-bzw. Rotorunwuchten ermöglicht.The invention has for its object to provide a device according to the above-mentioned and known type, which provides a practically backlash-free seat of the blades on the wheel disc with a simple and easy-to-assemble design when the blade safety device is mounted and which at the same time simplifies the removal of possible disc or. Rotor unbalance enabled.

Die gestellte Aufgabe ist mit den Merkmalen des Kennzeichnungsteils des Patentanspruchs 1 erfindungsgemäß gelöst.The stated object is achieved according to the invention with the features of the characterizing part of patent claim 1.

Bei der angegebenen Lösung wird jede Laufschaufel spielfrei mit ihren fußseitigen An- bzw. Auflageflächen gegen korrespondierende Auflageflächen der Axialnut im betreffenden Radkranz der Radscheibe gedrückt. Sämtliche Laufschaufeln befinden sich praktisch in einem jeweils gleichförmigen statischen Auflage- und Einbauzustand, so daß eine gegebenenfalls noch an der Scheibe vorhandene Unwucht- bzw. Restunwucht eindeutig definierbar und kompensierbar ist. Sofern eine Scheibenunwucht vorliegt, kann die betreffende spezifisch gewichtlich abgestimmte Wuchtmasse betriebssicher gegenüber dem Sicherungselement in der betreffenden Ausnehmung am Schaufelfuß festgelegt werden. Bei vergleichsweise einfacher Montage- und Demontagemöglichkeit sind die Laufschaufeln und das Sicherungselement in axialer Richtung an der Radscheibe gesichert.In the solution given, each rotor blade is pressed with its foot-side contact or support surfaces against corresponding support surfaces of the axial groove in the wheel rim of the wheel disk in question. All blades are practically in a uniform static support and installation state, so that any unbalance or residual unbalance that may still be present on the disk can be clearly defined and compensated for. If there is a disc imbalance is present, the specific weight-balanced balancing mass in question can be fixed in an operationally reliable manner with respect to the securing element in the relevant recess on the blade root. With comparatively simple assembly and disassembly options, the blades and the securing element are secured to the wheel disk in the axial direction.

Die radiale Spalthöhe kann zumindest in Richtung auf eine Radkranz- bzw. Scheibenstirnseite so groß bemessen sein, daß die Wuchtmasse zunächst über die eine größere seitliche Spaltöffnung in die Ausnehmung am Schaufelfuß einsetzbar ist und hierauf das Sicherungselement verkeilt wird.The radial gap height can be dimensioned so large, at least in the direction of a wheel rim or disc end face, that the balancing mass can initially be inserted into the recess on the blade root via the larger lateral gap opening and the securing element is wedged thereon.

Grundsätzlich kann ferner die keilartige Verklemmung zumindest im Sinne der Merkmale nach Anspruch 2 oder 3 durchgeführt werden. Eine intensive und längs des Schaufelfußes möglichst große und gleichförmige Flächenpressung ist insbesondere gemäß Anspruch 4 erzielbar, wonach der Axialspalt und das Sicherungselement hinsichtlich des sich axial ändernden Spalthöhenverlaufs im wesentlichen keilförmig aufeinander abgestimmt gestaltet sind.In principle, the wedge-like jamming can also be carried out at least in the sense of the features according to claim 2 or 3. An intensive and uniform surface pressure along the blade root which is as large and uniform as possible can be achieved in particular according to claim 4, according to which the axial gap and the securing element are designed to be essentially wedge-shaped in relation to one another with regard to the axially changing gap height profile.

Gemäß Anspruch 5 kann der keilförmige Verlauf aus jeweils einseitiger Fußabschrägung relativ zur achsparallelen Endfläche des Nutgrundes gewonnen werden. Die Axialnut, und damit die Radscheibe brauchen somit nicht hinsichtlich der Durchführung der Erfindung baulich verändert zu werden.According to claim 5, the wedge-shaped course can be obtained from one-sided foot bevel relative to the axially parallel end surface of the groove base. The axial groove, and thus the wheel disc, therefore do not need to be structurally changed with regard to the implementation of the invention.

Mit Anspruch 2 und/oder 6 kann das Sicherungselement vergleichsweise gewichtlich leicht gefertigt werden.With claim 2 and / or 6, the securing element can be made comparatively light weight.

Insbesondere über die Blechsicke (Anspruch 7) ergbit sich bei spezifisch geringem Eigengewicht des Sicherungselements eine vergleichsweise einfache Herstellbarkeit und - soweit erforderlich - zugleich ein formsteifer Aufbau.In particular, via the sheet metal bead (claim 7), with a specifically low weight of the securing element, there is a comparatively simple manufacture and, if necessary, a dimensionally stable construction.

Gute Stütz- und Halteeigenschaften ergeben sich mit dem Sicherungselement nach Anspruch 7 und 8. Den Stützabschnitten kann eine gewisse elastische Deformation zugeschrieben werden, um eine möglichst axial gleichförmig am Schaufelfuß herrschende Flächenpressung im Hinblick auf Formtoleranzen zu gewährleisten.Good support and holding properties result with the securing element according to claim 7 and 8. A certain elastic deformation can be attributed to the support sections in order to ensure a surface pressure which is as axially uniform as possible on the blade root with regard to shape tolerances.

Grundsätzlich besteht die Möglichkeit, vorgegebene Bauteiltoleranzen zwischen jeweiligem Fußende und Grund einer Axialnut durch eine vorgegebene Formauswahl an vorrätigen Sicherungselementen auszugleichen.Basically, there is the possibility of compensating for predetermined component tolerances between the respective foot end and the base of an axial groove by means of a predetermined selection of shapes of available security elements.

Anhand der Zeichnungen ist die Erfindung beispielhaft weiter erläutert; es zeigen:

Fig. 1
einen gemäß Teilausschnitt im Sinne der Schnittlinie II-II der Fig. 2 versetzten Axialschnitt eines radial innen und schaufelseitig außen abgebrochenen Radscheibenabschnitts unter Verdeutlichung einer seitlichen Ansicht des Sicherungselements in axial und radial fester Anordnung im beteffenden axialen Spalt zwichen örtlichem Fußende und Grund einer Axialnut der Radscheibe,
Fig. 2
einen quermittigen Teilausschnitt der Radscheibe nach Fig. 1 unter örtlich quer und mittig geschnittener Zuordnung des an einer Axialnut verankerten Schaufelfußes, des betreffenden Sicherungselements und eines Wuchtgewichts in der örtlichen Fußausnehmung der Laufschaufel, wobei der axiale Spalt mit örtlich größerer Bauhöhe als in Fig. 1 dargestellt ist,
Fig. 3
eine im Sinne der Fig. 2 quer und mittig geschnitten dargestellte erste Abwandlung des Sicherungselements und
Fig. 4
eine im Sinne der Fig. 2 quer und mittig geschnitten dargestellte zweite Abwandlung des Sicherungselements.
The invention is further explained by way of example with reference to the drawings; show it:
Fig. 1
an offset according to the section line II-II of FIG. 2 offset axial section of a radially inner and blade side broken off wheel disc section, showing a lateral view of the securing element in an axially and radially fixed arrangement in the axial gap between the local foot end and the bottom of an axial groove of the wheel disc ,
Fig. 2
1 with a locally transverse and central cut assignment of the blade root anchored to an axial groove, the relevant securing element and a balancing weight in the local foot recess of the rotor blade, the axial gap being shown with a locally greater overall height than in FIG. 1 is
Fig. 3
a transversely and centrally sectioned first modification of the securing element shown in FIG. 2 and
Fig. 4
a second modification of the securing element shown in cross-section and centered in the sense of FIG. 2.

Gemäß Fig. 1 und 2 ist jeweils eine Laufschaufel 1 mit ihrem mehrzahnigen Schaufelfuß 2 an einer entsprechend ausgeformten Axialnut E am Radkranz 4 eine Radscheibe 5 verankert. Zwischen dem Fußende 3, radial innen, und dem Nutgrund G der Axialnut 3 ist ein axialer Spalt S belassen, der hinsichtlich der Einbauhöhe - gemäß Fig. 1 von links nach rechts gesehen- zunehmend gleichförmig etwa keilförmig sich erweiternd ausgebildet ist. Der keilförmig sich erweiternde Verlauf des axialen Spalts S ist im vorliegende Fall z.B. durch den Neigungswinkel α charakterisiert, und zwar zwischen dem scheibenachsparallelen Nutgrund G und dem hierzu abgeschrägten, radial innen liegenden Ende E des Schaufelfußes 2. Das abgeschrägte Ende E des Schaufelfußes 2 kann z.B. durch einen Schrägschliff bereitgestellt werden.1 and 2, a rotor blade 1 is anchored with its multi-toothed blade root 2 to a correspondingly shaped axial groove E on the wheel rim 4, a wheel disc 5. Between the foot end 3, radially inward, and the groove base G of the axial groove 3, an axial gap S is left which, with regard to the installation height - as seen from left to right in FIG. 1 - is increasingly uniformly widening approximately in a wedge shape. The wedge-shaped course of the axial gap S is e.g. characterized by the angle of inclination α, namely between the groove base G parallel to the disk and the tapered, radially inner end E of the blade root 2. The tapered end E of the blade root 2 can e.g. be provided by a bevel cut.

Innerhalb des axialen Spaltes S ist ein über die rechte offene Spaltseite der Axialnut 3 eingeführtes Sicherungselement 6 keilartig verklemmt. Auf diese Weise wird die Laufschaufel 1 spiellos an der Axialnut 3 festgelegt, wobei entlang gegenseitiger Auflagestellen A (Fig.2), zwischen den Fuß- und Nut-Zahnprofilen, ein fester Stützkontakt ausgebildet ist.Within the axial gap S, a securing element 6, which is inserted over the right open gap side of the axial groove 3, is clamped like a wedge. In this way, the blade 1 is fixed without play on the axial groove 3, a fixed support contact being formed along mutual support points A (FIG. 2), between the root and groove tooth profiles.

Das Sicherungselement 6 überbrückt mit einem radial äußeren Wandabschnitt eine im Schaufelfuß 2 enthaltene, einseitig offen Ausnehmung 7, die zur Aufnahme einer spezifisch gewichtlich abgestimmten Wuchtmasse 8 ausgebildet ist.The securing element 6 bridges, with a radially outer wall section, a recess 7, which is contained in the blade root 2 and is open on one side and is designed to accommodate a specifically balanced mass 8.

Gemäß Fig. 1 und 2 ist das Sicherungselement 6 aus einem zumindest abschnittsweise keilförmig verfomrten Blechstreifen gefertigt. Dieses Sicherungselement kann z.B. durch Stanz- oder Prägeverfahren hergestellt werden. Letzteres gilt insbesondere für die Anfertigung einer Blechsicke 9, die im wesentlichen die benötigte Keilform bereitstellt, so daß der Axialspalt S und das Sicherungselement 6 hinsichtlich des sich einseitig axial ändernden Spalthöheverlaufs im wesentlichen keilförmig aufeinander abgestimmt gestaltet sind.1 and 2, the securing element 6 is made from a sheet metal strip which is deformed at least in sections in a wedge shape. This securing element can be manufactured, for example, by stamping or embossing processes. The latter applies in particular to the production of a sheet metal bead 9, which essentially provides the required wedge shape, so that the axial gap S and the securing element 6 are designed to be essentially wedge-shaped with respect to the gap height profile that changes axially on one side.

Im Beispiel der Fig. 1 und 2 sitzt das Sicherungselement 6 mit seitlich geradwandigen Abschnitten am Nutgrund G auf. Von den geradwandigen Abschnitten ausgehend, ist das Sicherungselement 6 zur Blechsicke 9 verformt, so daß - gemäß Fig. 2 - ein gegenüber dem Nutgrund G teilweise einseitig offener, etwa trapezförmiger Querschnitt ausgebildet ist, der auf die örtlich vorhandene Endkontur der Axialnut 3 am axialen Spalt S abgestimmt gestaltet ist.In the example of FIGS. 1 and 2, the securing element 6 sits on the groove base G with laterally straight-walled sections. Starting from the straight-walled sections, the securing element 6 is deformed into the sheet metal bead 9, so that - according to FIG. 2 - an approximately trapezoidal cross-section, which is partially open on one side with respect to the groove base G, is formed, which crosses the local end contour of the axial groove 3 at the axial gap S is designed to match.

Gemäß Fig. 1 kann das Sicherungselement 6 an beidseitigen Endbereichen des axialen Spalts S Stützabschnitte St aufweisen. Die Stützabschnitte St, zwischen denen sich die Blechsicke 9 erstreckt, können von gegenüber den geradwandigen Abschnitten abgewinkelt umgebogenen Blechabschnitten bereitgestellt werden. Ferner enthält das Sicherungselement 6 endseitig axial offene Trennfugen oder -spalte, so daß seitlich außen axial von den Stützabschnitten St vorstehende Endteile E1,E2 laschenartig radial umbiegbar sind, um das Sicherungselement 6 und die betreffende Laufschaufel 1 über den Schaufelfuß 2 axial an der Radscheibe 5 zu sichern.1, the securing element 6 can have support sections St on both end regions of the axial gap S. The support sections St, between which the sheet metal bead 9 extends, can be provided by sheet metal sections bent at an angle to the straight-walled sections. Furthermore, the securing element 6 contains axially open separating gaps or gaps at the ends, so that end parts E1, E2 projecting axially laterally axially from the support sections St can be bent radially in a flap-like manner around the securing element 6 and the relevant moving blade 1 axially on the wheel disk 5 via the blade root 2 to secure.

Auch ohne die genannten Stützabschnitte St ist die Erfindung durchführbar, nämlich in Kombination der keilförmigen Sicke 9 mit den laschenartig umbiegbaren Endteilen E1,E2.The invention can also be carried out without the mentioned support sections St, namely in combination of the wedge-shaped bead 9 with the end parts E1, E2 which can be bent over in the manner of a tab.

Fig. 3 und 4 verkörpern in Relation zur jeweiligen Axialnut-Konturvorgabe am axialen Spalt S abgewandelte, hier z.B. über dem Umfang in sich geschlossene Hohlprofilarten für Sicherungselemente 6' bzw. 6''. Gemäß Fig. 3 weist das Sicherungselement 6' eine auf die radial innere Axialnutkontur abgerundet abgestimmte Kontur auf.3 and 4 embody modified in relation to the respective axial groove contour specification at the axial gap S, here e.g. Self-contained hollow profile types for securing elements 6 'or 6' 'over the circumference. According to FIG. 3, the securing element 6 'has a contour which is rounded off to the radially inner axial groove contour.

In Fig. 4 ist die in sich geschlossene Hohlprofilkontur des Sicherungselements 6'' z.B., von oben nach unten gesehen, sich keilförmig verjüngend auf die radial innere Axialnutkontur am Spalt S abgestimmt gestaltet.4, the self-contained hollow profile contour of the securing element 6 ″ is, for example, seen from top to bottom, tapered in a wedge shape to match the radially inner axial groove contour at the gap S.

In Abwandlung der Fig. 1 bis 4 können gemäß der Erfindung bei den Sicherungselementen zumindest zur Bereitstellung der jeweiligen Keilform am axialen Spalt S, Vollprofile verwendet werden, die z.B. durch Walz-, Schmiede- oder Pressverfahren hergestellt sind.1 to 4, according to the invention, solid profiles can be used for the securing elements at least to provide the respective wedge shape at the axial gap S, which, for example, are produced by rolling, forging or pressing processes.

Claims (9)

Einrichtung zur Laufschaufelfixierung und zur Beseitigung von Rotorunwuchten bei axial durchströmten Verdichtern oder Turbinen von Gasturbinentriebwerken, bei der die Laufschaufeln (1) mit zahnartig profilierten Schaufelfüßen (2) an korrespondierend ausgeformten Axialnuten (3) einer Radscheibe (5) verankert sind, wobei jeweils zwischen einem Schaufelfußende und dem Grund einer Axialnut (3) ein axialer Spalt (S) belassen in dem ein Sicherungselement (6) angeordnet ist, das an beiden aus dem Spalt herausragenden Enden (E1,E2) einander entgegengerichtet gegen Stirnflächen der Radscheibe (5) und eines Schaufelfußes (2) umgebogen ist, dadurch gekennzeichnet, daß jedes Sicherungselment (6) in einem Axialspalt (S) zwischen dem Nutgrund (G) und dem Schaufelfuß keilartig verklemmt ist und dabei eine Ausnehmung (7) überbrückt, die im Schaufelfuß (2) zur Aufnahme einer Wuchtmasse (8) ausgebildet ist.Device for fixing the rotor blades and eliminating rotor imbalances in compressors or turbines of gas turbine engines with axial flow, in which the rotor blades (1) are anchored with tooth-shaped blade roots (2) on correspondingly shaped axial grooves (3) of a wheel disc (5), each between one Blade root end and the base of an axial groove (3) leave an axial gap (S) in which a securing element (6) is arranged, which on both ends protruding from the gap (E1, E2) opposed to each other against end faces of the wheel disc (5) and one Blade base (2) is bent, characterized in that each securing element (6) is wedge-like clamped in an axial gap (S) between the groove base (G) and the blade base and thereby bridges a recess (7) in the blade base (2) Inclusion of a balance mass (8) is formed. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Sicherungselement (6) abschnittsweise mit in einer axialen Richtung sich fortlaufend vergrößerndem Bauteilquerschnitt keilförmig gestaltet ist.Device according to claim 1, characterized in that the securing element (6) is designed in sections with a wedge-shaped component cross-section which increases continuously in an axial direction. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Axialspalt (S) mit sich in der einen axialen Richtung fortlaufend vergrößernder Bauhöhe von relativ zueinander geneigten Endflächen eines Schaufelfußes (2) und des Nutgrundes (G) keilförmig ausgebildet ist.Device according to claim 1 or 2, characterized in that the axial gap (S) is continuous with it in one axial direction increasing overall height of relatively inclined end faces of a blade root (2) and the groove base (G) is wedge-shaped. Einrichtung nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Axialspalt (S) und das Sicherungselement (6) hinsichtlich des sich einseitig axial ändernden Spalthöhenverlaufs im wesentlichen keilförmig aufeinander abgestimmt gestaltet sind.Device according to one or more of claims 1 to 3, characterized in that the axial gap (S) and the securing element (6) are designed to be substantially wedge-shaped in relation to one another with respect to the gap height profile which changes axially on one side. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der keilförmige Verlauf des Axialspaltes (S) jeweils zwischen einer achsparallelen Endfläche am Nutgrund (G) und der relativ dazu abgeschrägten Endfläche (E) eines Schaufelfußes (2) ausgebildet ist.Device according to claim 3, characterized in that the wedge-shaped course of the axial gap (S) is formed in each case between an axially parallel end face on the groove base (G) and the end face (E) of a blade root (2) which is bevelled relative thereto. Einrichtung nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Sicherungselement (6) aus einem abschnittsweise keilförmig verformten Blechstreifen gefertigt ist.Device according to one or more of claims 1 to 5, characterized in that the securing element (6) is made from a sheet metal strip which is wedge-shaped in sections. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, daß das Sicherungselement (6) im wesentlichen durch eine Blechsicke (9) keilförmig gestaltet ist, die, von geradwandigen Abschnitten ausgehend, in Richtung auf ein Schaufelfußende (E) keilförmig ausgeformt ist, wobei das Sicherungselement (6) mit den geradwandigen Abschnitten am Nutgrunde aufsitzt.Device according to claim 6, characterized in that the securing element (6) is essentially wedge-shaped by a sheet metal bead (9) which, starting from straight-walled sections, is wedge-shaped in the direction of a blade root end (E), the securing element (6 ) with the straight-walled sections on the base of the groove. Einrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß das Sicherungselement (6) an beidseitigen Endbereichen des Axialspalts (S) in Abstimmung auf die örtlich unterschiedliche Einbauhöhe abgewinkelt umgebogene Stützabschnitte (St) für den Schaufelfuß (2) aufweist, an die sich die über Trennspalte laschenartig umbiegbaren Enden (E1,E2) des Sicherungselements (6) anschließen.Device according to claim 6 or 7, characterized in that the securing element (6) has bent-over support sections (St) for the blade root (2) at both ends of the axial gap (S) in coordination with the locally different installation height, to which the blade root (2) is attached Connect the separating gap (E1, E2) of the securing element (6), which can be bent over like a tab. Einrichtung nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Sicherungselement (6,6',6'') hinsichtlich des jeweils größeren Teils der Längen-Erstreckung im axialen Spalt (S) als Hohl- oder Vollprofil auf die örtlich vorgegebene Kontur der Axialnut (3) am axialen Spalt (S) abgestimmt gestaltet ist.Device according to one or more of claims 1 to 6, characterized characterized in that the securing element (6, 6 ', 6'') with respect to the respective greater part of the length extension in the axial gap (S) as a hollow or solid profile on the locally specified contour of the axial groove (3) on the axial gap (S ) is designed to be coordinated.
EP95112351A 1994-08-29 1995-08-05 Device for locking rotor blades and eliminating rotor imbalance in compressors or turbines of gas turbine engines Expired - Lifetime EP0699824B1 (en)

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DE4430636A DE4430636C2 (en) 1994-08-29 1994-08-29 Device for fixing the rotor blades and eliminating rotor imbalances in compressors or turbines of gas turbine engines with axial flow
DE4430636 1994-08-29

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EP0699824A1 true EP0699824A1 (en) 1996-03-06
EP0699824B1 EP0699824B1 (en) 1998-01-21

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EP (1) EP0699824B1 (en)
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EP2009245A1 (en) * 2007-06-26 2008-12-31 Snecma Fan rotor
CN102817640A (en) * 2011-06-09 2012-12-12 通用电气公司 Turbomachine blade locking system
CN102943695A (en) * 2012-08-30 2013-02-27 哈尔滨汽轮机厂有限责任公司 Balancing method for bacterial type looped blade roots and blades
EP2455588B1 (en) * 2010-11-15 2017-03-01 MTU Aero Engines GmbH Securing module for axial securing of a root of a turbo engine blade
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EP1643082A1 (en) * 2004-09-30 2006-04-05 Siemens Aktiengesellschaft Turbine blade retention system
KR200445274Y1 (en) 2007-07-30 2009-07-14 두산중공업(주) A finger type bucket fixing apparatus of a turbine
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DE102010053123A1 (en) 2010-12-01 2012-06-06 Mtu Aero Engines Gmbh Method for manufacturing balancing weight for rotary base structure of turbomachine e.g. gas turbine used in aircraft engine, involves forming open profile for base structure of metal sheet by reshaping base structure of metal sheet
IT1403416B1 (en) * 2010-12-21 2013-10-17 Avio Spa BORED ROTOR OF A GAS TURBINE FOR AERONAUTICAL ENGINES AND METHOD FOR COOLING OF THE BORED ROTOR
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EP2009245A1 (en) * 2007-06-26 2008-12-31 Snecma Fan rotor
FR2918129A1 (en) * 2007-06-26 2009-01-02 Snecma Sa IMPROVEMENT TO AN INTERCALE BETWEEN A FOOT OF DAWN AND THE BACKGROUND OF THE ALVEOLE OF THE DISK IN WHICH IT IS MOUNTED
US8529209B2 (en) 2007-06-26 2013-09-10 Snecma Spacer interposed between a blade root and the bottom of a slot in the disk in which the blade is mounted
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EP2455588B1 (en) * 2010-11-15 2017-03-01 MTU Aero Engines GmbH Securing module for axial securing of a root of a turbo engine blade
CN102817640A (en) * 2011-06-09 2012-12-12 通用电气公司 Turbomachine blade locking system
CN102817640B (en) * 2011-06-09 2016-02-24 通用电气公司 Turbine bucket locking system
CN102943695A (en) * 2012-08-30 2013-02-27 哈尔滨汽轮机厂有限责任公司 Balancing method for bacterial type looped blade roots and blades
CN102943695B (en) * 2012-08-30 2014-11-26 哈尔滨汽轮机厂有限责任公司 Balancing method for bacterial type looped blade roots and blades
EP3244005A1 (en) * 2016-04-01 2017-11-15 General Electric Company Method and apparatus for balancing a rotor
US10436224B2 (en) 2016-04-01 2019-10-08 General Electric Company Method and apparatus for balancing a rotor

Also Published As

Publication number Publication date
US5584659A (en) 1996-12-17
EP0699824B1 (en) 1998-01-21
DE59501325D1 (en) 1998-02-26
DE4430636A1 (en) 1996-03-14
DE4430636C2 (en) 1997-01-23

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