EP2149677B1 - Attachment device for attaching a rotor blade to a rotor of a turbomachine - Google Patents

Attachment device for attaching a rotor blade to a rotor of a turbomachine Download PDF

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Publication number
EP2149677B1
EP2149677B1 EP08013704A EP08013704A EP2149677B1 EP 2149677 B1 EP2149677 B1 EP 2149677B1 EP 08013704 A EP08013704 A EP 08013704A EP 08013704 A EP08013704 A EP 08013704A EP 2149677 B1 EP2149677 B1 EP 2149677B1
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EP
European Patent Office
Prior art keywords
abutment
rotor
blade
blade root
retaining groove
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EP08013704A
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German (de)
French (fr)
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EP2149677A1 (en
Inventor
François Dr. Benkler
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Siemens AG
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Siemens AG
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Publication date
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Priority to AT08013704T priority Critical patent/ATE523659T1/en
Priority to EP08013704A priority patent/EP2149677B1/en
Publication of EP2149677A1 publication Critical patent/EP2149677A1/en
Application granted granted Critical
Publication of EP2149677B1 publication Critical patent/EP2149677B1/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
    • F01D5/12—Blades
    • F01D5/26—Antivibration means not restricted to blade form or construction or to blade-to-blade connections or to the use of particular materials
    • 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

Definitions

  • the invention relates to a fastening arrangement for attachment of a blade to a rotor of a turbomachine, having a holding portion arranged in a mounting portion, which has two opposite openings for insertion of the blade and in which a blade root of the blade is inserted, wherein between a groove bottom of the retaining groove and a lower side of the blade root a tensioning device is provided.
  • Stationary gas turbines have as a component a compressor through which the air needed for combustion of a fuel can be compressed to a high pressure.
  • a compressor of a stationary gas turbine is designed as an axial flow compressor.
  • the compressed air within its flow path thus flows in the axial direction of the rotor mounted therein, wherein the rotor blades arranged on the rotor blades and the casings attached to the housing form pairs of compressor stages, which are arranged in cascade.
  • axial compressors having fourteen or twenty compressor stages are known. Their front compressor stages, ie the inflow-side compressor stages, have comparatively large airfoils, whereas their rear, outflow-side compressor stages have comparatively short airfoils.
  • the front blades of the compressor usually have a dovetail-shaped blade root for attachment, which is inserted into corresponding retaining grooves.
  • the retaining grooves arranged in the rotor are distributed along the circumference of a rotor disk and extend in each case in the axial direction or slightly inclined thereto.
  • the blades are seated safely and without play in the retaining grooves, since due to the centrifugal forces acting on them at nominal rotational speed, they strongly strive outwards and thus bear rigidly against the supporting flanks of the retaining groove.
  • the rotor At the start of the gas turbine and / or at the engraving subsequent to the gas turbine operation rotary operation, in which the rotor is driven at a low speed, for example, 120 U / min, it may cause wear due to the game-afflicted seat. Because of the low speed and then for a play-free seat to low centrifugal forces tilt the blades in the groove with each revolution of the rotor back and forth, so that the blade foot rattles while hammering against the side walls of the retaining. The larger and heavier the guide rails are and the greater the play, the stronger are the signs of wear on the blade root and / or on the retaining material limiting material of the rotor disk, which then further increases the clearance between the blade and the retaining groove.
  • the blade root is designed with slight excess to the retaining groove.
  • this has the disadvantage that the blades can be difficult to be inserted into the retaining groove during assembly.
  • the object of the invention is therefore to provide a fastening arrangement of the type mentioned in the always a biased seat of the blade is reliably ensured in the holding for each operating condition.
  • the tensioning device comprises a tension rod which extends parallel to the extension of the retaining groove and has a thread at its first end, a first abutment screwed onto the thread and a second abutment at its second end opposite the first end comprises, wherein between the two abutments, a dowel is provided, which is compressible by rotating the tie rod by the then abutting each other to abutment.
  • the invention thus comes off the idea that the biasing force required in the radial direction already has to be generated with the insertion of the blade into the retaining groove.
  • the invention proposes, however, to provide a slight clearance between the blade root and retaining groove, so that the blade can be relatively easily inserted during assembly or during maintenance in the holding or taken out of this.
  • a tensioning device is inserted between the underside of the blade root and the groove base of the retaining groove only after insertion of the blade, by means of which a bias for the heat-expansion-tolerant attachment of the blade to the latter can be applied.
  • the novel clamping device for rattle avoidance or to prevent relative movement of the blades within the retaining groove comprises a dowel arranged between the underside of the blade root and the groove base of the retaining groove, which can be compressed axially. By compressing the dowel this deviates laterally, so that a force is generated, which presses the blade root in the radial direction. However, since the blade root is held positively in the radial direction by the retaining groove, can be generated by the evasive dowel a bias on the blade root, which presses it reliably into the retaining groove. This allows a backlash-free seat of the blade within the retaining groove, regardless of the speed of the rotor.
  • the bias is chosen so that even heat-related strains in the material of the mounting assembly, ie in the material surrounding the retaining groove, does not lead to a playful seat of the blade in the retaining groove, even if the rotor only at a reduced speed - ie Starting the gas turbine or during rotary operation - is driven and the centrifugal load on the blade is only comparatively low.
  • the tensioning device comprises a tension rod, a first abutment which can be screwed to the tension rod, a second abutment and the dowel arranged therebetween.
  • the first abutment which is secured against turning, is moved in the direction of the second abutment, during which the dowel arranged between the abutments is compressed and thereby evades in a direction transverse to the direction of displacement of the first abutment.
  • the dowel is pressed on the one hand against the groove bottom of the retaining groove and on the other hand against the underside of the blade root, whereby a bias voltage in the radial direction of the rotor can be built up and further increased with continued tensioning, so that even in (rotary) operation still existing thermal expansion a sufficient bias is maintained, which ensures a play-free seat of the blade within the retaining groove.
  • the invention thus enables the introduction of biasing forces acting in the radial direction of the rotor after the actual assembly of the compressor blades into the retaining groove.
  • the effort when inserting the blade can be minimized in the holding.
  • the dowel is designed in the manner of a spring shaft made of a resilient material. During the tensioning process, this can dodge in the direction of the underside of the blade root and in the direction of the groove bottom of the retaining groove.
  • the first abutment for preventing rotation on a contour which corresponds at least partially to the contour of the underside of the blade root and / or the contour of the retaining groove.
  • the contour of the abutment serves as its rotation.
  • the second abutment is preferably designed as a locking disk, on the one hand, i. radially outward, with the blade root and on the other hand, i. radially inward with the rotor disk is respectively engaged.
  • a further locking disc may be provided, which on the one hand with the blade root and on the other hand with the retaining groove is engaged. This also makes it possible to prevent a displacement of the blade root along the retaining groove, which ensures a secure axial seating of the blade on the rotor.
  • a rotor for a turbomachine has at least one shaft collar, which has a plurality of fastening arrangements according to the invention as a fastening section on its circumference.
  • the rotor is modular, so that the shaft collar can be formed by a rotor disk.
  • the retaining grooves may extend along the axial direction of the rotor or slightly inclined thereto, so that the two opposing openings of the retaining groove are each arranged on the front side on the shaft collar or on the rotor disk.
  • a fastening arrangement 10 for fastening a rotor blade 12 to a rotor 14 of a turbomachine, preferably an axial compressor, is disclosed in US Pat FIG. 1 shown schematically in a longitudinal section.
  • the rotor 14 has a machine axis 16 about which the rotor 14 is rotatably mounted in the turbomachine.
  • a shaft collar in the form of a rotor disk is provided, which may be one of a plurality of rotor disks of the rotor 14.
  • the Rotor disks 18 are axially adjacent to each other - stacked - and connected to each other by a centrally extending through them by tie rods in a known manner.
  • the retaining groove 20 has two opposing openings 22, 24, through which the blade 12 can be inserted into the retaining groove 20.
  • the blade 12 comprises an airfoil 26 and a blade root 28 arranged thereon.
  • the blade root 28 is viewed in cross section (FIG. FIG. 2 ) formed dovetail-shaped, wherein the retaining groove 20 is at least partially formed corresponding to the dovetail shape of the blade root 28.
  • the dovetail-shaped blade root 28 has two flanks 29 extending in axial directions, which bear against corresponding flanks 31 of the retaining groove 28. By the dovetail shape, the blade 12 is held in the radial direction R in the retaining groove 20.
  • the blade root 28 has an underside 30, which is opposite to a groove bottom 32 of the retaining groove 20 at a distance.
  • a clamping device 34 according to the invention is arranged, which comprises a between the two openings 22, 24 extending tie rod 36 which is provided with a thread.
  • the tensioning device 34 comprises an in FIG. 1 further left illustrated first abutment 38 at a first end 40 of the tie rod 36 and at a first end 40 opposite the second end 42 plugged second abutment 44. Between the two abutments 38, 44 is a tubular wavy dowel 46 is provided in longitudinal section.
  • the second end 42 of the tie rod 36 extends through the second abutment 44 therethrough and has a bent end piece, through which the tension rod 36 can be rotated.
  • the tension rod 36 By the rotation of the tension rod 36, the first abutment 38 is moved in the direction of the second abutment 44, whereby the between them arranged on both sides open dowel 46 is compressed and compressed. Due to the compression of the dowel 46 tries this laterally to escape the direction of displacement of the first abutment 38.
  • the dowel 46 is thus pressed on the one hand in the direction of the bottom 30 of the blade root 28 and on the other hand in the direction of the groove bottom 32 of the retaining groove 20. In this way, a biasing force acting in the radial direction R can be generated by which the flanks 29 of the blade root 28 are pressed against the corresponding flanks 31 of the retaining groove 20.
  • the first abutment 38 has an outer contour which corresponds at least partially to the contour of the underside 30 of the blade root 28 and / or the contour of the groove bottom 32 of the retaining groove 20.
  • the abutment 38 moves along the axial direction to the second abutment 44 back.
  • a locking disc 48 is provided at that opening 22, on which the first abutment 38 is provided.
  • the locking disc 48 has a centrally located opening 50, at which the first end 40 of the tension rod 36 extends into and thus can be securely held in position.
  • Both the locking disc 48 and the second abutment 44 may be formed in the retaining groove 20 for axial securing of the blade 12.
  • securing grooves 52 are provided in the region of the underside 30 in the area of the openings 22, 24 arranged in the blade root 28 . These locking grooves 52 are opposite in the groove bottom 32 of the retaining groove 20 corresponding locking grooves 54 are arranged. Both the lock washer 48 and the second abutment 44 are engaged with the lock grooves 52, 54 so that the blade 12 is secured against displacement within the retainer groove 20 in the axial direction, that is, along the machine axis 16.
  • FIG. 1 and the in FIG. 2 shown mounting arrangement for each provided on the circumference of the rotor disk 18 blade 12 is provided.
  • the blade 12 is inserted with its blade root 28 into the retaining groove 20.
  • a partially preassembled clamping device 34 consisting of pull rod 36, first abutment 38 and the dowel 46 open on both sides in the space between the bottom 30 of the blade root 28 and groove bottom 32 of the retaining groove 20 through one of the two openings 22, 24 is inserted.
  • the second abutment 44 is inserted into the securing grooves 52, 54, after which the second end 42 of the tension rod 36 is bent.
  • a completely pre-assembled clamping device can be used.
  • the locking disc 48 can be inserted into the opening 22, on which the first abutment 38 is arranged.
  • the second abutment 38 can be moved in the direction of the first abutment 44, whereby the dowel 46 arranged therebetween is compressed.
  • the dowel 46 may be made for example of a temperature-resistant plastic, but also of metal.
  • the dowel 46 is made of a resilient metal.
  • the invention thus relates to a total of a mounting assembly 10 for attachment of a blade 12 to a rotor 14 of a turbomachine, wherein in axial holding grooves 20 between the bottom 30 of the blade root 28 and the groove bottom 32 of the retaining groove 20, a novel clamping device 34 is provided.
  • the clamping device 34 according to the invention comprises a parallel to the extension of the retaining groove 20 extending tie rod 36 with a thread.
  • a rotationally secured first abutment 38 is screwed and at its second end 40, a second abutment 44.
  • a dowel 46 is provided, which escapes by the Auffactzube admire the abutment 38, 44 in the radial direction of the rotor 14 and In this case, the blade 12 with the aid of a bias backlash and stretch tolerant fixed in the retaining groove 20, even for a provided after the operation of the gas turbine rotary operation.

Abstract

The arrangement (10) has a retaining screw (20) in which a blade base (28) of a rotor blade (12) is inserted. A clamping device (34) is provided between a screw base (32) and a lower side (30) of the blade base. The clamping device has a tension rod (36) that includes a thread, where the rod extends parallel to an extension of the screw. An anti-twist thrust bearing (38) is provided at an end (40) of the rod and screwed on the thread. Another inserted thrust bearing (44) is provided at another end (42) of the rod. A shaft-shaped dowel (46) is provided between the thrust bearings.

Description

Die Erfindung betrifft eine Befestigungsanordnung zur Befestigung von einer Laufschaufel an einem Rotor einer Turbomaschine, mit einer in einem Befestigungsabschnitt angeordneten Haltenut, welche zwei einander gegenüberliegende Öffnungen zum Einschieben der Laufschaufel aufweist und in die ein Schaufelfuß der Laufschaufel eingesetzt ist, wobei zwischen einem Nutgrund der Haltenut und einer Unterseite des Schaufelfußes eine Spannvorrichtung vorgesehen ist.The invention relates to a fastening arrangement for attachment of a blade to a rotor of a turbomachine, having a holding portion arranged in a mounting portion, which has two opposite openings for insertion of the blade and in which a blade root of the blade is inserted, wherein between a groove bottom of the retaining groove and a lower side of the blade root a tensioning device is provided.

Stationäre Gasturbinen weisen als eine Komponente einen Verdichter auf, durch den die zur Verbrennung eines Brennstoffs benötigte Luft auf einen hohen Druck verdichtet werden kann. Üblicherweise ist ein solcher Verdichter einer stationären Gasturbine als axial durchströmter Verdichter ausgebildet. Die innerhalb seines Strömungspfades verdichtete Luft strömt folglich in Axialrichtung des in ihm gelagerten Rotors, wobei die am Rotor angeordneten Laufschaufelkränze und die am Gehäuse befestigten Leitschaufelkränze paarweise Verdichterstufen bilden, die kaskadierend angeordnet sind. Beispielsweise sind im Stand der Technik Axialverdichter mit vierzehn oder zwanzig Verdichterstufen bekannt. Deren vorderen Verdichterstufen, d.h. die einströmseitigen Verdichterstufen, weisen vergleichsweise große Schaufelblätter auf, wogegen deren hinteren, ausströmseitigen Verdichterstufen vergleichsweise kurze Schaufelblätter aufweisen. Die vorderen Laufschaufeln des Verdichters haben zur Befestigung zumeist einen schwalbenschwanzförmig ausgebildeten Schaufelfuß, der in korrespondierende Haltenuten eingeschoben ist. Die im Rotor angeordneten Haltenuten sind dabei entlang des Umfangs einer Rotorscheibe verteilt und erstrecken sich jeweils in Axialrichtung oder geringfügig geneigt dazu. Um eine einfache Montage der Laufschaufeln in der Haltenut zu gewährleisten, können beim Stand der Technik diese mit geringem Spiel in die Haltenut einschiebbar sein. Während des Gasturbineribetriebs sitzen die Laufschaufeln sicher und spielfrei in den Haltenuten, da aufgrund der bei Nenndrehzahl auf sie einwirkenden Fliehkräfte diese stark nach außen streben und so starr an den Tragflanken der Haltenut anliegen.Stationary gas turbines have as a component a compressor through which the air needed for combustion of a fuel can be compressed to a high pressure. Usually, such a compressor of a stationary gas turbine is designed as an axial flow compressor. The compressed air within its flow path thus flows in the axial direction of the rotor mounted therein, wherein the rotor blades arranged on the rotor blades and the casings attached to the housing form pairs of compressor stages, which are arranged in cascade. For example, in the prior art, axial compressors having fourteen or twenty compressor stages are known. Their front compressor stages, ie the inflow-side compressor stages, have comparatively large airfoils, whereas their rear, outflow-side compressor stages have comparatively short airfoils. The front blades of the compressor usually have a dovetail-shaped blade root for attachment, which is inserted into corresponding retaining grooves. The retaining grooves arranged in the rotor are distributed along the circumference of a rotor disk and extend in each case in the axial direction or slightly inclined thereto. In order to ensure easy mounting of the blades in the retaining groove, can State of the art with a small clearance in the retaining groove be inserted. During the gas turbine operation, the blades are seated safely and without play in the retaining grooves, since due to the centrifugal forces acting on them at nominal rotational speed, they strongly strive outwards and thus bear rigidly against the supporting flanks of the retaining groove.

Beim Start der Gasturbine und/oder bei dem stich an den Gasturbinenbetrieb anschließenden Drehbetrieb, bei welchem der Rotor mit einer geringen Drehzahl, beispielsweise 120 U/min, angetrieben wird, kann es aufgrund des spielbehafteten Sitzes zu Verschleißerscheinungen kommen. Wegen der geringen Drehzahl und der dann für einen spielfreien Sitz zu geringen Fliehkräfte kippen die Laufschaufeln in der Nut mit jeder Umdrehung des Rotors hin und her, so dass der Laufschaufelfuß klappert und dabei gegen die Seitenwände der Haltenut hämmert. Je größer und schwerer dabei die Laufschauteln sind und je größer das Spiel ist, um stärker sind die Verschleißerscheinungen am Laufschaufelfuß und/oder an dem die Haltenut begrenzenden Material der Rotorscheibe, was wiederum das Spiel zwischen Laufschaufel und Haltenut dann weiter vergrößert.At the start of the gas turbine and / or at the engraving subsequent to the gas turbine operation rotary operation, in which the rotor is driven at a low speed, for example, 120 U / min, it may cause wear due to the game-afflicted seat. Because of the low speed and then for a play-free seat to low centrifugal forces tilt the blades in the groove with each revolution of the rotor back and forth, so that the blade foot rattles while hammering against the side walls of the retaining. The larger and heavier the guide rails are and the greater the play, the stronger are the signs of wear on the blade root and / or on the retaining material limiting material of the rotor disk, which then further increases the clearance between the blade and the retaining groove.

Aus diesem Grunde ist es auch bekannt, die Laufschaufelfüße mit Vorspannung in der betreffenden Nut zu befestigen. Hierzu ist der Schaufelfuß mit geringfügigem Übermaß zur Haltenut ausgelegt. Hieran ist jedoch nachteilig, dass die Laufschaufeln bei der Montage nur schwerlich in die Haltenut eingeschoben werden können.For this reason, it is also known to secure the blade feet with bias in the relevant groove. For this purpose, the blade root is designed with slight excess to the retaining groove. However, this has the disadvantage that the blades can be difficult to be inserted into the retaining groove during assembly.

Darüber hinaus ist auch bekannt, auch sogenannte Axial-Sicherungsbleche zwischen die Unterseite des Schaufelfußes und dem Nutgrund der Haltenut einzulegen und deren Überstand aus der Haltenut an die Stirnseite der Rotorscheibe zu biegen, um die Schaufel gegen eine axiale Verschiebung zu sichern.In addition, it is also known to insert so-called axial locking plates between the underside of the blade root and the groove bottom of the retaining and bending their supernatant from the retaining groove to the front side of the rotor disc to secure the blade against axial displacement.

Alternativ dazu ist es aus der US 5, 123, 613 auch bekannt, nichtmetallische Fan-Schaufeln von Flugzeug-Gasturbinen in axialen Haltenuten vorgespannt zu befestigen. Dazu ist zwischen Nutgrund und schaufelfußunterseite ein federndes Material eingesetzt, welches mit Hilfe zweier Platten zusammengedrückt werden kann, wodurch das federnde Material in Radialrichtung ausweicht und dabei die gewünschte Vorspannung erzeugt. Eine Axialsicherung der Schaufel ist jedoch darüber nicht möglich.Alternatively, it is from the US 5, 123, 613 also known non-metallic fan blades of aircraft gas turbines in biased to secure axial retaining grooves. For this purpose, a resilient material is inserted between the bottom of the groove and blade root, which can be compressed by means of two plates, whereby the resilient material evades in the radial direction and thereby generates the desired bias. An axial securing of the blade, however, is not possible.

Anstelle des federnden Materials und der Platten kann gemäß US 4, 836, 749 auch ein hohler Zapfen eingesetzt werden, der mit Hilfe eines elektrischen Heizelements sich thermisch bedingt ausdehnt und dabei die Vorspannung erzeugt. Diese Anordnung ist jedoch vergleichsweise aufwändig und erfordert die Bereitstellung elektrischer Energie.Instead of the resilient material and the plates can according to US 4,836,749 Also, a hollow pin can be used, which expands with the help of an electric heating element thermally induced and thereby generates the bias. However, this arrangement is relatively complicated and requires the provision of electrical energy.

Eine weitere vorrichtung zur Erzeugung einer radialen Vorspannung ist aus der EP 1 905 957 A1 bekannt. Die Anordnung eines Dämpfers zwischen Nutgrund und Schaufelfußunterseite zeigt US 4, 453, 891 .Another device for generating a radial bias is out of EP 1 905 957 A1 known. The arrangement of a damper between groove bottom and blade bottom shows US 4, 453, 891 ,

Aufgabe der Erfindung ist daher die Bereitstellung einer Befestigungsanordnung der eingangs genannten Art, bei der stets ein vorgespannter Sitz der Laufschaufel in der Haltenut für jeden Betriebszustand zuverlässig gewährleistet ist.The object of the invention is therefore to provide a fastening arrangement of the type mentioned in the always a biased seat of the blade is reliably ensured in the holding for each operating condition.

Die der Erfindung zugrunde liegende Aufgabe wird mit einer Befestigungsanordnung gemäß den Merkmalen des Anspruchs 1 gelöst.The object underlying the invention is achieved with a fastening arrangement according to the features of claim 1.

Gemäß der Erfindung ist vorgesehen, dass die Spannvorrichtung einen sich parallel zur Erstreckung der Haltenut erstreckenden Zugstab mit einem Gewinde umfasst, der an seinem ersten Ende ein auf das Gewinde aufgeschraubtes, verdrehgesichertes erstes Widerlager und an seinem dem ersten Ende gegenüberliegenden zweiten Ende ein aufgestecktes zweites Widerlager umfasst, wobei zwischen den beiden Widerlagern ein Dübel vorgesehen ist, welcher durch Drehen des Zugstabes durch die dann sich aufeinander zu bewegenden Widerlager zusammenpressbar ist.According to the invention, it is provided that the tensioning device comprises a tension rod which extends parallel to the extension of the retaining groove and has a thread at its first end, a first abutment screwed onto the thread and a second abutment at its second end opposite the first end comprises, wherein between the two abutments, a dowel is provided, which is compressible by rotating the tie rod by the then abutting each other to abutment.

Die Erfindung löst sich somit von dem Gedanken, dass die in Radialrichtung benötigte Vorspannkraft bereits mit dem Einschieben der Laufschaufel in die Haltenut erzeugt werden muss. Die Erfindung schlägt dagegen vor, zwischen Schaufelfuß und Haltenut ein geringfügiges Spiel vorzusehen, so dass die Laufschaufel vergleichsweise einfach während der Montage oder auch während Wartungsarbeiten in die Haltenut eingesetzt oder aus dieser Herausgenommen werden kann. Bei der Montage wird erst nach dem Einsetzen der Laufschaufel eine Spannvorrichtung zwischen die Unterseite des Schaufelfußes und dem Nutgrund der Haltenut eingesetzt, mittels der eine Vorspannung zur wärmedehnungstoleranten Befestigung der Laufschaufel auf letztgenannte aufgebracht werden kann. Die neuartige Spannvorrichtung zur Klappervermeidung oder zur Vermeidung einer relativen Bewegung der Laufschaufeln innerhalb der Haltenut umfasst einen zwischen der Unterseite des Schaufelfußes und dem Nutgrund der Haltenut angeordneten Dübel, welcher axial zusammenpressbar ist. Durch das Zusammenpressen des Dübels weicht dieser seitlich aus, so dass eine Kraft erzeugt wird, welche den Schaufelfuß in Radialrichtung drückt. Da jedoch der Schaufelfuß in Radialrichtung formschlüssig von der Haltenut gehalten wird, kann durch den ausweichenden Dübel eine Vorspannung auf den Schaufelfuß erzeugt werden, die diesen zuverlässig in die Haltenut einpresst. Dies ermöglicht einen spielfreien Sitz der Laufschaufel innerhalb der Haltenut, unabhängig von der Drehzahl des Rotors. Die Vorspannung ist so gewählt, dass selbst wärmebedingte Dehnungen im Material der Befestigungsanordnung, also in dem Material, welches die Haltenut umgibt, nicht zu einem spielbehafteten Sitz der Laufschaufel in der Haltenut führt, selbst dann, wenn der Rotor nur mit verminderter Drehzahl - also beim Starten der Gasturbine oder beim Drehbetrieb - angetrieben wird und die Fliehkraftbelastung auf die Schaufel nur vergleichsweise gering ist.The invention thus comes off the idea that the biasing force required in the radial direction already has to be generated with the insertion of the blade into the retaining groove. The invention proposes, however, to provide a slight clearance between the blade root and retaining groove, so that the blade can be relatively easily inserted during assembly or during maintenance in the holding or taken out of this. During assembly, a tensioning device is inserted between the underside of the blade root and the groove base of the retaining groove only after insertion of the blade, by means of which a bias for the heat-expansion-tolerant attachment of the blade to the latter can be applied. The novel clamping device for rattle avoidance or to prevent relative movement of the blades within the retaining groove comprises a dowel arranged between the underside of the blade root and the groove base of the retaining groove, which can be compressed axially. By compressing the dowel this deviates laterally, so that a force is generated, which presses the blade root in the radial direction. However, since the blade root is held positively in the radial direction by the retaining groove, can be generated by the evasive dowel a bias on the blade root, which presses it reliably into the retaining groove. This allows a backlash-free seat of the blade within the retaining groove, regardless of the speed of the rotor. The bias is chosen so that even heat-related strains in the material of the mounting assembly, ie in the material surrounding the retaining groove, does not lead to a playful seat of the blade in the retaining groove, even if the rotor only at a reduced speed - ie Starting the gas turbine or during rotary operation - is driven and the centrifugal load on the blade is only comparatively low.

Im Detail umfasst die Spannvorrichtung einen Zugstab, ein erstes mit dem Zugstab verschraubbares Widerlager, ein zweites Widerlager und den dazwischen angeordneten Dübel.In detail, the tensioning device comprises a tension rod, a first abutment which can be screwed to the tension rod, a second abutment and the dowel arranged therebetween.

Durch das Drehen des Zugstabes wird das erste Widerlager, welches gegen ein Mitdrehen gesichert ist, in Richtung des zweiten Widerlagers bewegt, wobei währenddessen der zwischen den Widerlagern angeordnete Dübel zusammengepresst wird und dabei in eine Richtung quer zur Verschieberichtung des ersten Widerlagers ausweicht. Hierdurch drückt sich der Dübel einerseits gegen den Nutgrund der Haltenut und andererseits gegen die Unterseite des Schaufelfußes, wodurch bei fortgesetztem Spannvorgang eine Vorspannung in Radialrichtung des Rotors aufgebaut und weiter vergrößert werden kann, so dass selbst bei im (Dreh-)Betrieb noch vorhandenen wärmebedingten Dehnungen eine ausreichende Vorspannung erhalten bleibt, die einen spielfreien Sitz der Laufschaufel innerhalb der Haltenut gewährleistet.By turning the tie rod, the first abutment, which is secured against turning, is moved in the direction of the second abutment, during which the dowel arranged between the abutments is compressed and thereby evades in a direction transverse to the direction of displacement of the first abutment. As a result, the dowel is pressed on the one hand against the groove bottom of the retaining groove and on the other hand against the underside of the blade root, whereby a bias voltage in the radial direction of the rotor can be built up and further increased with continued tensioning, so that even in (rotary) operation still existing thermal expansion a sufficient bias is maintained, which ensures a play-free seat of the blade within the retaining groove.

Die Erfindung ermöglicht folglich das Einbringen von in Radialrichtung des Rotors wirkenden Vorspannkräften nach der eigentlichen Montage der Verdichterlaufschaufeln in die Haltenut. Somit kann der Kraftaufwand beim Einschieben der Laufschaufel in die Haltenut minimiert werden.The invention thus enables the introduction of biasing forces acting in the radial direction of the rotor after the actual assembly of the compressor blades into the retaining groove. Thus, the effort when inserting the blade can be minimized in the holding.

Der Dübel ist dabei nach Art einer Federwelle aus einem federelastischem Material ausgebildet. Während des Spannvorgangs kann dieser in Richtung der Unterseite des Schaufelfußes und in Richtung Nutgrund der Haltenut ausweichen.The dowel is designed in the manner of a spring shaft made of a resilient material. During the tensioning process, this can dodge in the direction of the underside of the blade root and in the direction of the groove bottom of the retaining groove.

Vorteilhafte Ausgestaltungen sind in den unteransprüchen angegeben.Advantageous embodiments are specified in the dependent claims.

Bevorzugtermaßen weist das erste Widerlager zur Verdrehsicherung eine Kontur auf, welche zumindest teilweise der Kontur der Unterseite des Schaufelfußes und/oder der Kontur der Haltenut entspricht. Durch diese geeignete Kontur ist es möglich, dass das erste Widerlager entlang der Unterseite des Schaufelfußes und dem Nutgrund der Haltenut geführt werden kann, ohne dass sich dieses beim Drehen des Zugstabes mit dreht. Somit dient die Kontur des Widerlagers als dessen Verdrehsicherung.Preferably, the first abutment for preventing rotation on a contour which corresponds at least partially to the contour of the underside of the blade root and / or the contour of the retaining groove. By this suitable contour, it is possible that the first abutment along the underside of the blade root and the groove bottom of the retaining groove can be performed without this rotates when turning the tension rod with. Thus, the contour of the abutment serves as its rotation.

Um eine Verschiebung des Schaufelfußes entlang der Haltenut, zu verhindern, ist das zweite widerlager vorzugsweise als Arretierscheibe ausgebildet, die einerseits, d.h. radial außen, mit dem Schaufelfuß und andererseits, d.h. radial innen mit der Rotorscheibe jeweils in Eingriff ist.In order to prevent a displacement of the blade root along the retaining groove, the second abutment is preferably designed as a locking disk, on the one hand, i. radially outward, with the blade root and on the other hand, i. radially inward with the rotor disk is respectively engaged.

Alternativ oder zusätzlich kann auch an derjenigen öffnung, an der das erste widerlager angeordnet ist, eine weitere Arretierscheibe vorgesehen sein, die einerseits mit dem Schaufelfuß und andererseits mit der Haltenut in Eingriff ist. Auch hierdurch kann eine Verschiebung des Schaufelfußes entlang der Haltenut verhindert werden, was einen sicheren axialen Sitz der Laufschaufel am Rotor gewährleistet.Alternatively or additionally, at the opening at which the first abutment is arranged, a further locking disc may be provided, which on the one hand with the blade root and on the other hand with the retaining groove is engaged. This also makes it possible to prevent a displacement of the blade root along the retaining groove, which ensures a secure axial seating of the blade on the rotor.

Um den zugstab stets parallel zur Erstreckung der Haltenut zu führen und zu positionieren, weist die weitere ArretierScheibe eine Öffnung auf, in die der zugstab zumindest teilweise hineinragt.To guide the tension rod always parallel to the extension of the retaining and position, has the further ArretierScheibe an opening into which the tension rod protrudes at least partially.

Gemäß einer weiteren vorteilhaften Weiterbildung weist ein Rotor für eine Turbomaschine zumindest einen Wellenbund auf, der als Befestigungsabschnitt an seinem Umfang eine Vielzahl von erfindungsgemäßen Befestigungsanordnungen aufweist. Zweckmäßigerweise ist der Rotor modular ausgebildet, so dass der wellenbund von einer Rotorscheibe gebildet sein kann.According to a further advantageous development, a rotor for a turbomachine has at least one shaft collar, which has a plurality of fastening arrangements according to the invention as a fastening section on its circumference. Conveniently, the rotor is modular, so that the shaft collar can be formed by a rotor disk.

Die Haltenuten können sich entlang der Axialrichtung des Rotors oder geringfügig dazu geneigt erstrecken, so dass die beiden einander gegenüberliegenden Öffnungen der Haltenut jeweils stirnseitig am Wellenbund oder an der Rotorscheibe angeordnet sind.The retaining grooves may extend along the axial direction of the rotor or slightly inclined thereto, so that the two opposing openings of the retaining groove are each arranged on the front side on the shaft collar or on the rotor disk.

Die Erfindung wird anhand einer Zeichnung erläutert. In den darin enthaltenen Figuren sind weitere Merkmale gezeigt, die in der nachfolgende Figurenbeschreibung eingehend näher erläutert werden und deren vorteile darin genannt sind.The invention will be explained with reference to a drawing. In the figures contained therein further features are shown, which are explained in more detail in the following description of the figures and whose advantages are mentioned therein.

Es zeigen:

FIG 1
den Längsschnitt durch einen als Rotorscheibe gebilde- ten Wellenbund mit einer erfindungsgemäßen Befesti- gungsanordnung und
FIG 2
die Seitenansicht auf eine Befestigungsanordnung gemäß FIG 1.
Show it:
FIG. 1
the longitudinal section through a formed as a rotor disk shaft collar with a fastening arrangement according to the invention and
FIG. 2
the side view of a mounting arrangement according to FIG. 1 ,

Eine erfindungsgemäße Befestigungsanordnung 10 zur Befestigung von einer Laufschaufel 12 an einem Rotor 14 einer Turbomaschine, vorzugsweise Axialverdichter, ist in FIG 1 in einem Längsschnitt schematisch dargestellt. Der Rotor 14 weist eine Maschinenachse 16 auf, um welche der Rotor 14 drehbar gelagert in der Turbomaschine angeordnet ist. Am Rotor 14 ist ein Wellenbund in Form einer Rotorscheibe is vorgesehen, die eine von mehreren Rotorscheiben des Rotors 14 sein kann. Die Rotorscheiben 18 sind axial zueinander benachbart - gestapelt - und durch einen sich zentrisch durch sie durch erstreckenden Zuganker in bekannter Art und Weise miteinander verbunden.A fastening arrangement 10 according to the invention for fastening a rotor blade 12 to a rotor 14 of a turbomachine, preferably an axial compressor, is disclosed in US Pat FIG. 1 shown schematically in a longitudinal section. The rotor 14 has a machine axis 16 about which the rotor 14 is rotatably mounted in the turbomachine. On the rotor 14, a shaft collar in the form of a rotor disk is provided, which may be one of a plurality of rotor disks of the rotor 14. The Rotor disks 18 are axially adjacent to each other - stacked - and connected to each other by a centrally extending through them by tie rods in a known manner.

Am Außenumfang der Rotorscheibe 18 ist zumindest eine sich in Axialrichtung erstreckende Haltenut 20 (FIG 2) vorgesehen. Die Haltenut 20 weist zwei einander gegenüberliegende Öffnungen 22, 24 auf, durch die die Laufschaufel 12 in die Haltenut 20 eingeschoben werden kann. Die Laufschaufel 12 umfasst ein Schaufelblatt 26 sowie einen daran angeordneten Schaufelfuß 28. Der Schaufelfuß 28 ist in Querschnitt betrachtet (FIG 2) schwalbenschwanzförmig ausgebildet, wobei die Haltenut 20 zumindest teilweise korrespondierend zur Schwalbenschwanzform des Schaufelfußes 28 geformt ist. Der schwalbenschwanzförmige Schaufelfuß 28 weist zwei sich in Axialrichtungen erstreckende Flanken 29 auf, welche sich an korrespondierende Flanken 31 der Haltenut 28 anlegen. Durch die Schwalbenschwanzform wird die Laufschaufel 12 in Radialrichtung R in der Haltenut 20 gehalten.On the outer circumference of the rotor disk 18 is at least one axially extending retaining groove 20 (FIG. FIG. 2 ) intended. The retaining groove 20 has two opposing openings 22, 24, through which the blade 12 can be inserted into the retaining groove 20. The blade 12 comprises an airfoil 26 and a blade root 28 arranged thereon. The blade root 28 is viewed in cross section (FIG. FIG. 2 ) formed dovetail-shaped, wherein the retaining groove 20 is at least partially formed corresponding to the dovetail shape of the blade root 28. The dovetail-shaped blade root 28 has two flanks 29 extending in axial directions, which bear against corresponding flanks 31 of the retaining groove 28. By the dovetail shape, the blade 12 is held in the radial direction R in the retaining groove 20.

Zudem weist der Schaufelfuß 28 eine Unterseite 30 auf, welcher einem Nutgrund 32 der Haltenut 20 unter Abstand gegenüberliegt. Zwischen Nutgrund 32 und Unterseite 30 ist eine erfindungsgemäße Spannvorrichtung 34 angeordnet, die einen sich zwischen den beiden Öffnungen 22, 24 erstreckenden Zugstab 36, welcher mit einem Gewinde versehen ist, umfasst. Ferner umfasst die Spannvorrichtung 34 ein in FIG 1 weiter links dargestelltes erstes Widerlager 38 an einem ersten Ende 40 des Zugstabes 36 sowie an einem dem ersten Ende 40 gegenüberliegenden zweiten Ende 42 aufgestecktes zweites Widerlager 44. Zwischen den beiden Widerlagern 38, 44 ist ein rohrförmiger, im Längschnitt wellenförmiger Dübel 46 vorgesehen. Das zweite Ende 42 des Zugstabes 36 erstreckt sich durch das zweite Widerlager 44 hindurch und weist ein umgebogenes Endstück auf, durch welches der Zugstab 36 gedreht werden kann. Durch die Drehung des Zugstabes 36 wird das erste Widerlager 38 in Richtung des zweiten Widerlagers 44 bewegt, wodurch der dazwischen angeordnete beidseitig offene Dübel 46 zusammengepresst und gestaucht wird. Durch die Stauchung des Dübels 46 versucht dieser seitlich zur Verschieberichtung des ersten Widerlagers 38 auszuweichen. Der Dübel 46 wird somit einerseits in Richtung der Unterseite 30 des Schaufelfußes 28 und andererseits in Richtung des Nutgrundes 32 der Haltenut 20 gepresst. Hierdurch kann eine in Radialrichtung R wirkende Vorspannkraft erzeugt werden, durch die die Flanken 29 des Schaufelfußes 28 an die korrespondierenden Flanken 31 der Haltenut 20 gepresst werden.In addition, the blade root 28 has an underside 30, which is opposite to a groove bottom 32 of the retaining groove 20 at a distance. Between groove bottom 32 and bottom 30 a clamping device 34 according to the invention is arranged, which comprises a between the two openings 22, 24 extending tie rod 36 which is provided with a thread. Furthermore, the tensioning device 34 comprises an in FIG. 1 further left illustrated first abutment 38 at a first end 40 of the tie rod 36 and at a first end 40 opposite the second end 42 plugged second abutment 44. Between the two abutments 38, 44 is a tubular wavy dowel 46 is provided in longitudinal section. The second end 42 of the tie rod 36 extends through the second abutment 44 therethrough and has a bent end piece, through which the tension rod 36 can be rotated. By the rotation of the tension rod 36, the first abutment 38 is moved in the direction of the second abutment 44, whereby the between them arranged on both sides open dowel 46 is compressed and compressed. Due to the compression of the dowel 46 tries this laterally to escape the direction of displacement of the first abutment 38. The dowel 46 is thus pressed on the one hand in the direction of the bottom 30 of the blade root 28 and on the other hand in the direction of the groove bottom 32 of the retaining groove 20. In this way, a biasing force acting in the radial direction R can be generated by which the flanks 29 of the blade root 28 are pressed against the corresponding flanks 31 of the retaining groove 20.

Um ein Mitdrehen des zweiten Widerlagers 38 beim Drehen des Zugstabes 36 zu vermeiden, weist das erste Widerlager 38 eine äußere Kontur auf, welche zumindest teilweise der Kontur der Unterseite 30 des Schaufelfußes 28 und/oder der Kontur des Nutgrundes 32 der Haltenut 20 entspricht. Während des Verdrehens des Zugstabes 36 bewegt sich das Widerlager 38 entlang der Axialrichtung zum zweiten Widerlager 44 hin. Um währenddessen eine sichere Lage des Zugstabes 36 zu gewährleisten, ist an derjenigen Öffnung 22, an der das erste Widerlager 38 vorgesehen ist, eine Arretierscheibe 48 vorgesehen. Die Arretierscheibe 48 weist eine zentral angeordnete Öffnung 50 auf, an der das erste Ende 40 des Zugstabes 36 sich hineinerstreckt und dadurch an seiner Position sicher gehalten werden kann.To avoid co-rotation of the second abutment 38 when turning the tension rod 36, the first abutment 38 has an outer contour which corresponds at least partially to the contour of the underside 30 of the blade root 28 and / or the contour of the groove bottom 32 of the retaining groove 20. During the rotation of the tension rod 36, the abutment 38 moves along the axial direction to the second abutment 44 back. In order to ensure a secure position of the tension rod 36 during this time, a locking disc 48 is provided at that opening 22, on which the first abutment 38 is provided. The locking disc 48 has a centrally located opening 50, at which the first end 40 of the tension rod 36 extends into and thus can be securely held in position.

Sowohl die Arretierscheibe 48 als auch das zweite Widerlager 44 können dabei zur Axialsicherung der Laufschaufel 12 in der Haltenut 20 ausgebildet sein. Hierzu sind im Bereich der Unterseite 30 im Bereich der Öffnungen 22, 24 im Schaufelfuß 28 angeordnete Sicherungsnuten 52 vorgesehen. Diesen Sicherungsnuten 52 gegenüberliegend sind im Nutgrund 32 der Haltenut 20 korrespondierende Sicherungsnuten 54 angeordnet. Sowohl die Arretierscheibe 48 als auch das zweite Widerlager 44 sind mit den Sicherungsnuten 52, 54 in Eingriff, so dass die Laufschaufel 12 gegen eine Verschiebung innerhalb der Haltenut 20 in Axialrichtung, das heißt entlang der Maschinenachse 16, gesichert ist.Both the locking disc 48 and the second abutment 44 may be formed in the retaining groove 20 for axial securing of the blade 12. For this purpose, in the region of the underside 30 in the area of the openings 22, 24 arranged in the blade root 28 securing grooves 52 are provided. These locking grooves 52 are opposite in the groove bottom 32 of the retaining groove 20 corresponding locking grooves 54 are arranged. Both the lock washer 48 and the second abutment 44 are engaged with the lock grooves 52, 54 so that the blade 12 is secured against displacement within the retainer groove 20 in the axial direction, that is, along the machine axis 16.

Bekanntermaßen ist die in FIG 1 und die in FIG 2 dargestellte Befestigungsanordnung für jede am Umfang der Rotorscheibe 18 vorgesehene Laufschaufel 12 vorgesehen.As is known, the in FIG. 1 and the in FIG. 2 shown mounting arrangement for each provided on the circumference of the rotor disk 18 blade 12 is provided.

Zum Herstellen der Befestigungsanordnung 10 wird die Laufschaufel 12 mit ihrem Schaufelfuß 28 in die Haltenut 20 eingeschoben. Anschließend wird eine teilweise vormontierte Spannvorrichtung 34 bestehend aus Zugstab 36, ersten Widerlager 38 und den beidseitig offenen Dübel 46 in den Raum zwischen Unterseite 30 des Schaufelfußes 28 und Nutgrund 32 der Haltenut 20 durch eine der beiden Öffnungen 22, 24 eingeschoben. Nach dem Einsetzen wird das zweite Widerlager 44 in die Sicherungsnuten 52, 54 eingesetzt, wonach das zweite Ende 42 des Zugstabes 36 umgebogen wird. Alternativ dazu kann ggf. auch eine vollständig vormontierte Spannvorrichtung eingesetzt werden. Anschließend kann die Arretierscheibe 48 in die Öffnung 22 eingesetzt werden, an der das erste Widerlager 38 angeordnet ist. Sodann kann durch Drehen des ersten Endes 42 des Zugstabes 36 das zweite Widerlager 38 in Richtung des ersten Widerlagers 44 bewegt werden, wodurch der dazwischen angeordnete Dübel 46 gestaucht wird.For producing the fastening arrangement 10, the blade 12 is inserted with its blade root 28 into the retaining groove 20. Subsequently, a partially preassembled clamping device 34 consisting of pull rod 36, first abutment 38 and the dowel 46 open on both sides in the space between the bottom 30 of the blade root 28 and groove bottom 32 of the retaining groove 20 through one of the two openings 22, 24 is inserted. After insertion, the second abutment 44 is inserted into the securing grooves 52, 54, after which the second end 42 of the tension rod 36 is bent. Alternatively, if necessary, a completely pre-assembled clamping device can be used. Subsequently, the locking disc 48 can be inserted into the opening 22, on which the first abutment 38 is arranged. Then, by turning the first end 42 of the tension rod 36, the second abutment 38 can be moved in the direction of the first abutment 44, whereby the dowel 46 arranged therebetween is compressed.

Der Dübel 46 kann beispielsweise aus einem temperaturfesten Kunststoff, aber auch aus Metall gefertigt sein. Vorzugsweise ist der Dübel 46 aus einem federelastischen Metall gefertigt.The dowel 46 may be made for example of a temperature-resistant plastic, but also of metal. Preferably, the dowel 46 is made of a resilient metal.

Die Erfindung betrifft somit insgesamt eine Befestigungsanordnung 10 zur Befestigung von einer Laufschaufel 12 an einem Rotor 14 einer Turbomaschine, wobei in axialen Haltenuten 20 zwischen der Unterseite 30 des Schaufelfußes 28 und dem Nutgrund 32 der Haltenut 20 eine neuartige Spannvorrichtung 34 vorgesehen ist. Um eine besonders einfache Montage der Laufschaufel in der Haltenut 20 zu ermöglichen, wobei gleichzeitig ein dehnungstoleranter, jedoch stets spielfreier Sitz der Laufschaufel 12 in der Haltenut 20 erreicht werden soll, umfasst die erfindungsgemäße Spannvorrichtung 34 einen sich parallel zur Erstreckung der Haltenut 20 verlaufenden Zugstab 36 mit einem Gewinde. Am ersten Ende des Zugstabs 36 ist ein verdrehgesichertes erstes Widerlager 38 aufgeschraubt und an seinem zweiten Ende 40 ein zweites Widerlager 44. Zwischen den beiden Widerlagern ist ein Dübel 46 vorgesehen, der durch das Aufeinanderzubewegen der Widerlager 38, 44 in Radialrichtung des Rotors 14 ausweicht und dabei die Laufschaufel 12 mit Hilfe einer Vorspannung spielfrei und dehnungstolerant in der Haltenut 20 befestigt, selbst für einen im Anschluss an den Betrieb der Gasturbine vorgesehenen Drehbetrieb.The invention thus relates to a total of a mounting assembly 10 for attachment of a blade 12 to a rotor 14 of a turbomachine, wherein in axial holding grooves 20 between the bottom 30 of the blade root 28 and the groove bottom 32 of the retaining groove 20, a novel clamping device 34 is provided. In order to enable a particularly simple assembly of the blade in the retaining groove 20, wherein at the same time a strain-tolerant, but always backlash-free seat of the blade 12 is to be achieved in the retaining groove 20, the clamping device 34 according to the invention comprises a parallel to the extension of the retaining groove 20 extending tie rod 36 with a thread. At the first end of the pull rod 36, a rotationally secured first abutment 38 is screwed and at its second end 40, a second abutment 44. Between the two abutments, a dowel 46 is provided, which escapes by the Aufeinanderzubewegen the abutment 38, 44 in the radial direction of the rotor 14 and In this case, the blade 12 with the aid of a bias backlash and stretch tolerant fixed in the retaining groove 20, even for a provided after the operation of the gas turbine rotary operation.

Claims (8)

  1. Fastening arrangement (10) for fastening a moving blade (12) to a rotor (14) of a turbomachine, with a holding groove (20) which is arranged in a fastening portion and has two mutually opposite orifices (22, 24) for pushing in the moving blade (12) and into which a blade root (28) of the moving blade (12) is inserted, a tension device (34) being provided between a groove bottom (32) of the holding groove (20) and an underside (30) of the blade root (28), the tension device (34) comprising a tie rod (36) which extends parallel to the extent of the holding groove (20) and has a thread and which comprises at its first end (40) a twist-proof first abutment (38) screwed onto the thread and at its second end (42) lying opposite the first end (40) a plugged-on second abutment (44), a dowel (46) being provided between the two abutments (38, 40), characterized in that the dowel (46) is designed in the manner of a corrugated spring manufactured from a spring-elastic metal.
  2. Fastening arrangement (10) according to Claim 1, in which, for the twist-proofing of the first abutment (38), the latter has a contour which corresponds at least partially to the contour of the underside (30) of the blade root (28) and/or to the contour of the holding groove (20).
  3. Fastening arrangement (10) according to Claim 1 or 2, in which the second abutment (44) is designed in such a way that displacement of the blade root (28) along the holding groove (20) is prevented.
  4. Fastening arrangement (10) according to Claim 3, in which the second abutment (44) is designed as a locking disc which is in engagement, on the one hand, with the blade root (28) and, on the other hand, with the holding groove (20).
  5. Fastening arrangement (10) according to one of the preceding claims, in which a locking disc is provided at the orifice (22) at which the first abutment (38) is arranged, the said locking disc being in engagement, on the one hand, with the blade root (28) and, on the other hand, with the holding groove (20).
  6. Fastening arrangement (10) according to Claim 5, in which the locking disc (48) has an orifice (50) for guiding the tie rod (36).
  7. Rotor (14) for a turbomachine, with at least one shaft collar which has, as a fastening portion, on its circumference, a multiplicity of fastening arrangements (10) according to one of the preceding claims.
  8. Rotor (14) according to Claim 7, in which the shaft collar is designed as a rotor disc (18).
EP08013704A 2008-07-30 2008-07-30 Attachment device for attaching a rotor blade to a rotor of a turbomachine Not-in-force EP2149677B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT08013704T ATE523659T1 (en) 2008-07-30 2008-07-30 FASTENING ARRANGEMENT FOR FASTENING A BLADE TO A ROTOR OF A TURBO MACHINE
EP08013704A EP2149677B1 (en) 2008-07-30 2008-07-30 Attachment device for attaching a rotor blade to a rotor of a turbomachine

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EP08013704A EP2149677B1 (en) 2008-07-30 2008-07-30 Attachment device for attaching a rotor blade to a rotor of a turbomachine

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EP2149677B1 true EP2149677B1 (en) 2011-09-07

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DE102010015404B4 (en) * 2010-04-19 2012-02-16 Mtu Aero Engines Gmbh Method for repairing a rotor assembly of a turbomachine, ring element for a rotor assembly of a turbomachine and rotor assembly for a turbomachine
US9739160B2 (en) * 2013-10-18 2017-08-22 Siemens Aktiengesellschaft Adjustable blade root spring for turbine blade fixation in turbomachinery
DE102019210647A1 (en) * 2019-07-18 2021-01-21 Siemens Energy Global GmbH & Co. KG Blade ring for an axial turbo machine
CN112943685B (en) * 2021-03-10 2022-09-13 哈电发电设备国家工程研究中心有限公司 Pull rod type blade root connecting structure
CN113931701A (en) * 2021-09-30 2022-01-14 中国长江动力集团有限公司 Last blade fixing method and fixing structure

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EP1905957A1 (en) 2006-09-27 2008-04-02 Siemens Aktiengesellschaft Locking device of a turbine blade

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EP2149677A1 (en) 2010-02-03

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