EP2076656B1 - Blade fastening means of a turbine - Google Patents

Blade fastening means of a turbine Download PDF

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Publication number
EP2076656B1
EP2076656B1 EP07802464A EP07802464A EP2076656B1 EP 2076656 B1 EP2076656 B1 EP 2076656B1 EP 07802464 A EP07802464 A EP 07802464A EP 07802464 A EP07802464 A EP 07802464A EP 2076656 B1 EP2076656 B1 EP 2076656B1
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EP
European Patent Office
Prior art keywords
turbine blade
wedge
locking device
blade
turbine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07802464A
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German (de)
French (fr)
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EP2076656A1 (en
Inventor
Thomas Helmis
Michael Kleinhaus
Christoph Richter
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Siemens AG
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Siemens AG
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Priority to EP07802464A priority Critical patent/EP2076656B1/en
Publication of EP2076656A1 publication Critical patent/EP2076656A1/en
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Publication of EP2076656B1 publication Critical patent/EP2076656B1/en
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Classifications

    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/321—Rotors specially for elastic fluids for axial flow pumps for axial flow compressors
    • F04D29/322—Blade mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
    • F01D5/3015—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type with side plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/326—Locking of axial insertion type blades by other means

Definitions

  • the invention relates to a turbine blade securing device for a turbomachine.
  • DE 834 408 shows a turbine blade fuse according to the preamble of claim 1.
  • Blade fasteners of the above type are typically used for mounting blades on a rotor of a turbomachine, such as a steam turbine, which rotate at high speed during rotation of the rotor. Due to the fast rotation of the rotor, the associated blades are subjected to high centrifugal force. The blade root of the blades is therefore exposed to high forces and is strongly forced radially outward in a groove on the blade holder. In addition, the blades are exposed to strong vibration loads, so that it can come to the groove to mechanical damage, material fatigue, corrosion and migration of the blade root within the groove.
  • the object of the invention is to provide a turbine blade securing device in which a precise and low-vibration mounting of turbine blades in associated blade holders is ensured over a long period of operation.
  • the invention is based on the idea that the turbine blade to be secured, which is held in a blade holder, must be secured by a radially acting force.
  • the traction device takes on the task of moving the wedge in the axial direction. The movement of the wedge creates a radial force that acts on the turbine blade in a radial direction. By a minimal movement of the turbine blade in the radial direction of the blade root is pressed into the blade holder. The turbine blade is thereby secured so that a tilting movement is almost avoided.
  • the wedge is applied to a corresponding rotor surface contact surface. This would be an alternative way to form the turbine blade fuse. Instead of the sloping wedge surface To put on the turbine blade root, it is proposed in this advantageous development to apply the wedge to a corresponding oblique wedge surface in the blade holder. This has the advantage that the blade root does not have to be processed. In addition, this has a favorable effect on the power flow in the foot.
  • a milled part which has the rotor surface contact surface. This has the advantage that the blade holder only has to be executed with a groove and that milled part can be inserted into the groove. The milled part can be prefabricated in large quantities. The blade holder can thereby be easily manufactured, since only one groove is needed.
  • the traction means has a thread which engages in a complementary mating thread in the wedge.
  • the traction means is developed with simple means such that it is easy to produce. The wedge moves by turning the traction mechanism. Depending on which pitch the thread has, the transmittable force on the turbine blade root is different.
  • a securing segment is provided, which is designed such that an unintentional release of the traction means is prevented by the wedge. This makes it possible to safely and securely place the wedge, with a release by the securing segment should be excluded.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Connection Of Plates (AREA)
  • Installation Of Indoor Wiring (AREA)

Abstract

A wedge (7) can be pulled in an axial direction (5) by means of a traction device (8). As a result, a force is produced in the axial direction. This force causes a turbine blade to be pressed against a turbine blade holder (4) so as to produce an effective means of making a turbine blade secure and safe.

Description

Die Erfindung betrifft eine Turbinenschaufelsicherung für eine Strömungsmaschine. DE 834 408 zeigt eine Turbinenschaufelsicherung nach dem Oberbegriff vom Anspruch 1.The invention relates to a turbine blade securing device for a turbomachine. DE 834 408 shows a turbine blade fuse according to the preamble of claim 1.

Schaufelbefestigungen der oben genannten Art werden in der Regel zum Befestigen von Laufschaufeln an einem Rotor einer Strömungsmaschine, wie beispielsweise einer Dampfturbine, verwendet, die bei Rotation des Rotors mit hoher Geschwindigkeit umlaufen. Durch die schnelle Rotation des Rotors werden die zugehörigen Laufschaufeln einer hohen Fliehkraft unterworfen. Der Schaufelfuß der Schaufeln ist daher hohen Kräften ausgesetzt und wird in einer Nut am Schaufelhalter stark radial nach außen gedrängt. Darüber hinaus sind die Schaufeln starken Schwingungsbelastungen ausgesetzt, so dass es an der Nut zu mechanischen Beschädigungen, Materialermüdungen, Korrosion und einer Wanderbewegung des Schaufelfußes innerhalb der Nut kommen kann.Blade fasteners of the above type are typically used for mounting blades on a rotor of a turbomachine, such as a steam turbine, which rotate at high speed during rotation of the rotor. Due to the fast rotation of the rotor, the associated blades are subjected to high centrifugal force. The blade root of the blades is therefore exposed to high forces and is strongly forced radially outward in a groove on the blade holder. In addition, the blades are exposed to strong vibration loads, so that it can come to the groove to mechanical damage, material fatigue, corrosion and migration of the blade root within the groove.

Zum Festlegen des Schaufelfußes innerhalb der Nut sind verschiedene Lösungen, wie beispielsweise Metallkeile, Federringe oder Abdichtungsstücke bekannt. Metallkeile stellen zwar sowohl axial als auch radial eine Arretierung des zugehörigen Schaufelfußes innerhalb einer Nut her, bei großen Schaufeln ist es mit solchen Metallkeilen aber schwierig, dass während der Rotation der Schaufel ausreichend Haltekräfte in radialer Richtung erzeugt werden. Tellerfedern erzeugen lediglich radiale Haltekräfte und erfordern zusätzlichen Aufwand für eine Arretierung in Längsrichtung der zugehörigen Nut. Ferner sind für Tellerfedern während der Montage aufwendige Messungen erforderlich. Als Abdichtungsstücke müssen immer zwei Teile vorgesehen sein, deren Montage darüber hinaus teilweise der Bearbeitung der Teile von Hand bedarf. Der Erfindung liegt die Aufgabe zu Grunde eine Turbinenschaufelsicherung bereitzustellen, bei der über einen langen Betriebszeitraum hinweg eine präzise und schwingungsarme Halterung von Turbinenschaufeln in zugehörigen Schaufelhaltern sichergestellt ist.For fixing the blade root within the groove, various solutions, such as metal wedges, spring washers or sealing pieces are known. Although metal wedges produce locking of the associated blade root within a groove both axially and radially, with large blades it is difficult with such metal wedges that sufficient holding forces are generated in the radial direction during the rotation of the blade. Disc springs only generate radial holding forces and require additional effort for a locking in the longitudinal direction of the associated groove. Furthermore, complex measurements are required for disc springs during assembly. As a seal pieces must always be provided two parts, the assembly also requires part of the processing of the parts by hand. The object of the invention is to provide a turbine blade securing device in which a precise and low-vibration mounting of turbine blades in associated blade holders is ensured over a long period of operation.

Die Aufgabe wird gelöst durch eine Turbinenschaufelsicherung nach Anspruch 1.The object is achieved by a turbine blade safety device according to claim 1.

Die Erfindung geht von dem Gedanken aus, dass die zu sichernde Turbinenschaufel, die in einem Schaufelhalter gehalten ist, durch eine radial wirkende Kraft gesichert werden muss. Das Zugmittel übernimmt hierbei die Aufgabe, den Keil in axialer Richtung zu bewegen. Durch die Bewegung des Keils entsteht eine radiale Kraft, die wirkt auf die Turbinenschaufel in einer radialen Richtung. Durch eine minimale Bewegung der Turbinenschaufel in radialer Richtung wird der Schaufelfuß in den Schaufelhalter gedrückt. Die Turbinenschaufel wird dadurch derart gesichert, dass eine Kippbewegung nahezu vermieden wird.The invention is based on the idea that the turbine blade to be secured, which is held in a blade holder, must be secured by a radially acting force. The traction device takes on the task of moving the wedge in the axial direction. The movement of the wedge creates a radial force that acts on the turbine blade in a radial direction. By a minimal movement of the turbine blade in the radial direction of the blade root is pressed into the blade holder. The turbine blade is thereby secured so that a tilting movement is almost avoided.

Vorteilhafte Weiterbildungen werden in den Unteransprüchen beschrieben. So ist es von Vorteil, wenn der Keil an einer entsprechenden Turbinenschaufelfußanlagefläche in der zu sichernden Turbinenschaufel anliegt. Dadurch ist eine Möglichkeit angegeben, den Keil und/oder die Turbinenschaufel einfach und kostengünstig herzustellen, um eine möglichst gute Kraftübertragung zu erhalten.Advantageous developments are described in the subclaims. Thus, it is advantageous if the wedge rests against a corresponding turbine blade root contact surface in the turbine blade to be secured. As a result, a possibility is specified, the wedge and / or the turbine blade simple and inexpensive to produce in order to obtain the best possible power transmission.

In einer weiteren vorteilhaften Weiterbildung wird der Keil an einer entsprechenden Rotoroberflächen-Anlegefläche angelegt. Dies wäre eine alternative Möglichkeit die Turbinenschaufelsicherung auszubilden. Statt die schräge Keilfläche an den Turbinenschaufelfuß anzulegen, wird in dieser vorteilhaften Weiterbildung vorgeschlagen, den Keil an einer entsprechenden schrägen Keilfläche im Schaufelhalter anzulegen. Dies hat den Vorteil, dass der Schaufelfuß nicht bearbeitet werden muss. Außerdem wirkt sich dies günstig auf den Kraftfluss im Fuß aus.In a further advantageous development, the wedge is applied to a corresponding rotor surface contact surface. This would be an alternative way to form the turbine blade fuse. Instead of the sloping wedge surface To put on the turbine blade root, it is proposed in this advantageous development to apply the wedge to a corresponding oblique wedge surface in the blade holder. This has the advantage that the blade root does not have to be processed. In addition, this has a favorable effect on the power flow in the foot.

In einer vorteilhaften Weiterbildung ist ein Frästeil vorgesehen, dass die Rotoroberflächen-Anlagefläche aufweist. Dies hat den Vorteil, dass der Schaufelhalter lediglich mit einer Nut ausgeführt werden muss und dass Frästeil in die Nut eingesetzt werden kann. Das Frästeil kann in großen Mengen vorgefertigt werden. Der Schaufelhalter kann dadurch einfach hergestellt werden, da lediglich eine Nut benötigt wird.In an advantageous development, a milled part is provided which has the rotor surface contact surface. This has the advantage that the blade holder only has to be executed with a groove and that milled part can be inserted into the groove. The milled part can be prefabricated in large quantities. The blade holder can thereby be easily manufactured, since only one groove is needed.

In einer weiteren vorteilhaften Weiterbildung weist das Zugmittel ein Gewinde auf, das in ein komplementäres Gegengewinde im Keil eingreift. Dadurch wird mit einfachen Mitteln das Zugmittel derart weitergebildet, dass es leicht herstellbar ist. Der Keil bewegt sich, indem das Zugmittel gedreht wird. Je nach dem welche Steigung das Gewinde hat, ist die übertragbare Kraft auf den Turbinenschaufelfuß unterschiedlich.In a further advantageous development, the traction means has a thread which engages in a complementary mating thread in the wedge. As a result, the traction means is developed with simple means such that it is easy to produce. The wedge moves by turning the traction mechanism. Depending on which pitch the thread has, the transmittable force on the turbine blade root is different.

In einer weiteren vorteilhaften Weiterbildung ist ein Sicherungssegment vorgesehen, dass derart ausgebildet, dass ein ungewolltes Lösen des Zugmittels von dem Keil verhindert ist. Dadurch wird es möglich, den Keil sicher und fest zu platzieren, wobei ein Lösen durch das Sicherungssegment ausgeschlossen werden soll.In a further advantageous embodiment, a securing segment is provided, which is designed such that an unintentional release of the traction means is prevented by the wedge. This makes it possible to safely and securely place the wedge, with a release by the securing segment should be excluded.

Vorteilhafter Weise wird das Sicherungssegment als Blech ausgeführt und die Sicherung des Zugmittels durch Umbiegen oder Umbördeln des Blechs an dem Zugmittel erfolgen. Dadurch ist es sehr einfach das Zugmittel, das selbstverständlich einen Schraubenkopf oder ähnliches aufweist, mit dem Sicherungssegment zu sichern. Ein einfaches Umbiegen des Bleches genügt um das Zugmittel zu sichern.Advantageously, the securing segment is designed as a sheet and securing the traction means by bending or crimping of the sheet done on the traction means. This makes it very easy to secure the traction means, which of course has a screw head or the like, with the securing segment. A simple bending of the sheet is sufficient to secure the traction means.

In einer weiteren vorteilhaften Weiterbildung ist ein Sicherungsmittel zum Ausüben einer Federkraft in radialer Richtung vorgesehen. Das Sicherungsmittel kompensiert für kleine Drehzahlbereiche eine Nutaufweitung.In a further advantageous embodiment, a securing means for exerting a spring force in the radial direction is provided. The locking device compensates for a groove widening for small speed ranges.

In vorteilhafter Weise wird das Sicherungsmittel als Tellerfeder ausgebildet.Advantageously, the securing means is designed as a plate spring.

Nachfolgend wird ein Ausführungsbeispiel einer erfindungsgemäßen Schaufelbefestigung anhand der beigefügten schematischen Zeichnungen näher erläutert. Es zeigen:

Figur 1
eine perspektivische Darstellung der Turbinen- schaufelsicherung im eingebauten Zustand,
Figur 2
eine Schnittansicht durch die Turbinenschaufel- sicherung,
Figur 3
eine vergrößerte Darstellung eines Teilaus- schnitts aus Figur 2,
Figur 4
eine perspektivische Darstellung des Schaufelhalters ohne Turbinenschaufel,
Figur 5
eine perspektivische Darstellung einer alternativen Ausführungsform der Turbinenschau- felsicherung ohne eingebauter Turbinenschaufel,
Figur 6
eine Querschnittsansicht einer alternativen Ausführungsform der Turbinenschaufelsicherung,
Figur 7
eine vergrößerte Darstellung eines Ausschnitts aus Figur 6,
Figur 8
eine perspektivische Darstellung der Turbinen- schaufelssicherung ohne Keil und ohne Turbinen- schaufel.
An exemplary embodiment of a blade attachment according to the invention will be explained in more detail below with reference to the attached schematic drawings. Show it:
FIG. 1
a perspective view of the turbine blade guard in the installed state,
FIG. 2
a sectional view through the turbine blade fuse,
FIG. 3
an enlarged view of a partial section from FIG. 2 .
FIG. 4
a perspective view of the blade holder without turbine blade,
FIG. 5
3 is a perspective view of an alternative embodiment of the turbine blade fuse without installed turbine blade,
FIG. 6
a cross-sectional view of an alternative embodiment of the turbine blade fuse,
FIG. 7
an enlarged view of a section from FIG. 6 .
FIG. 8
a perspective view of the turbine blade securing without wedge and without turbine blade.

In der Figur 1 ist eine perspektivische Darstellung einer Turbinenschaufelsicherung 1 zu sehen. Eine Turbinenschaufel 2 umfasst einen Schaufelfuß 3. Der Schaufelfuß 3 ist in bekannter Weise als Tannenbaumfuß ausgeführt. Der Schaufelfuß 3 ist in einem Schaufelhalter 4 angeordnet. Der Schaufelhalter 4 weist entsprechend ein dem Schaufelfuß 3 komplementär ausgebildete Tannenbaumform auf. Die Turbinenschaufel 2 muss sowohl in axialer Richtung 5 als auch in radialer Richtung 6 gesichert werden. Der Schaufelhalter 4 kann beispielsweise ein Rotor sein.In the FIG. 1 is a perspective view of a turbine blade fuse 1 can be seen. A turbine blade 2 comprises a blade root 3. The blade root 3 is designed in a known manner as Tannenbaumfuß. The blade root 3 is arranged in a blade holder 4. The blade holder 4 has a correspondingly the blade root 3 complementary formed Christmas tree shape. The turbine blade 2 must be secured both in the axial direction 5 and in the radial direction 6. The blade holder 4 may be, for example, a rotor.

In der Figur 2 ist eine Turbinenschaufelsicherung 1 in einer Schnittdarstellung zu sehen. Die Turbinenschaufelsicherung 1 umfasst einen in der axialen Richtung 5 bewegbaren Keil 7, wobei ein Zugmittel 8 derart mit dem Keil 7 zusammenwirkt, dass der Keil 7 durch das Zugmittel 8 in axialer Richtung 5 bewegbar ist. Der Keil 7 liegt an einer Turbinenschaufelfuß-Anlagefläche 9 an. Durch die Bewegung des Keils 7 gegen die Turbinenschaufelfuß-Anlagefläche 9 entsteht eine Kraft in der radialen Richtung 6.In the FIG. 2 is a turbine blade fuse 1 in a sectional view to see. The turbine blade safety device 1 comprises a wedge 7 which can be moved in the axial direction 5, wherein a traction means 8 interacts with the wedge 7 such that the wedge 7 can be moved in the axial direction 5 by the traction means 8. The wedge 7 abuts against a turbine blade root abutment surface 9. The movement of the wedge 7 against the turbine blade root abutment surface 9 creates a force in the radial direction 6.

Das Zugmittel 8 umfasst ein Gewinde 10. Der Keil 7 weist dementsprechend eine Bohrung 11 mit einem entsprechenden Gegengewinde 12 auf. Ein Drehen des Zugmittels 8 bewirkt eine Bewegung des Keils 7 in axialer Richtung 5. Das Zugmittel 8 weist hierbei einen üblichen Schraubenkopf 13 auf. Der Schraubenkopf 13 kann als Sechskant 14 ausgebildet sein und mit einem handelsüblichen Gabelschlüssel bewegt werden. Es kann hierbei ein vorbestimmtes Drehmoment eingestellt werden.The pulling means 8 comprises a thread 10. The wedge 7 accordingly has a bore 11 with a corresponding mating thread 12. A rotation of the traction means 8 causes a movement of the wedge 7 in the axial direction 5. The traction means 8 in this case has a conventional screw head 13. The screw head 13 may be formed as a hexagon 14 and moved with a standard open-end wrench. It can be set here a predetermined torque.

Die Turbinenschaufelsicherung 1 ist mit einem Sicherungssegment 15 ausgebildet. Das Sicherungssegment 15 verhindert ein ungewolltes Lösen des Zugmittels 8 von dem Keil 7. Dazu wird das Sicherungssegment 15 als Blech ausgeführt. Die Sicherung des Zugmittels 8 erfolgt durch Umbiegen oder Umbördeln des Blechs um das Zugmittel 8. Das Blech kann an dem Schraubenkopf 13 selbstverständlich umgebogen werden, um dadurch ein Drehen des Zugmittels 8 zu vermeiden.The turbine blade guard 1 is formed with a securing segment 15. The securing segment 15 prevents unintentional release of the pulling means 8 from the wedge 7. For this purpose, the securing segment 15 is designed as a sheet. The securing of the traction means 8 takes place by bending or crimping of the sheet around the traction means 8. The sheet can be attached to the screw head 13 are of course bent to thereby avoid turning the traction means 8.

Die Turbinenschaufelsicherung 1 weist darüber hinaus noch ein Sicherungsmittel 16 auf, das zum Ausüben einer Federkraft in der radialen Richtung 6 ausgebildet. Das Sicherungsmittel 16 ist dafür als Tellerfeder ausgebildet und in einer Sicherungsnut 17 angeordnet.The turbine blade safety device 1 also has a securing means 16, which is designed to exert a spring force in the radial direction 6. The securing means 16 is designed as a plate spring and arranged in a securing groove 17.

In der Figur 4 ist eine perspektivische Darstellung des Schaufelhalters zu sehen, wobei die Turbinenschaufel 2 nicht dargestellt ist. Der Keil 7 ist länglich ausgebildet und in einer passenden Nut 18 angeordnet.In the FIG. 4 is a perspective view of the blade holder to see, with the turbine blade 2 is not shown. The wedge 7 is elongated and arranged in a matching groove 18.

In der Figur 5 ist eine alternative Ausführungsform der Turbinenschaufelsicherung 1 dargestellt. Allerdings wurde in der Figur 5 die Turbinenschaufel 2 weggelassen, so dass lediglich der Schaufelhalter 4 zu sehen ist. Der Schaufelhalter 4 ist hierbei mit einer entsprechenden Nut 19 ausgebildet. In die Nut 19 ist ein Frästeil 20 angeordnet. Das Frästeil 20 weist eine Rotoroberflächen-Anlagefläche 21 auf. Die Rotoroberflächen-Anlagefläche 21 hat im Wesentlichen dieselbe Funktion wie die Turbinenschaufelfuß-Anlagefläche 9, nämlich eine Kraft des Keiles 7 in radialer Richtung 6 zu übertragen.In the FIG. 5 an alternative embodiment of the turbine blade guard 1 is shown. However, in the FIG. 5 the turbine blade 2 is omitted, so that only the blade holder 4 can be seen. The blade holder 4 is in this case formed with a corresponding groove 19. In the groove 19, a milled part 20 is arranged. The milled part 20 has a rotor surface contact surface 21. The rotor surface abutment surface 21 has substantially the same function as the turbine blade root abutment surface 9, namely to transmit a force of the wedge 7 in the radial direction 6.

Das Sicherungsmittel 16 ist hierbei zwischen dem Keil 7 und der Turbinenschaufel 2 angeordnet. Das Sicherungsmittel 16 übernimmt hierbei die gleichen Aufgaben wie zur Figur 2 und 3 beschrieben.The securing means 16 is in this case arranged between the wedge 7 and the turbine blade 2. The securing means 16 takes over the same tasks as for FIGS. 2 and 3 described.

In der Figur 5 ist der Keil 7 und das Sicherungsmittels 16 im eingebauten Zustand dargestellt.In the FIG. 5 the wedge 7 and the securing means 16 is shown in the installed state.

In der Figur 6 ist eine Schnittdarstellung durch die Turbinenschaufelsicherung 1 zu sehen. Selbstverständlich ist es vorteilhaft, wenn die erfindungsgemäße Anordnung aus Zugmittel und Keil an den Enden 21, 22 angeordnet wird.In the FIG. 6 is a sectional view through the turbine blade fuse 1 to see. Of course, it is advantageous if the inventive arrangement of traction means and wedge at the ends 21, 22 is arranged.

In der Figur 7 ist eine vergrößerte Darstellung der Turbinenschaufelsicherung 1 aus Figur 6 zu sehen.In the FIG. 7 is an enlarged view of the turbine blade 1 from FIG. 6 to see.

In der Figur 8 ist eine perspektivische Darstellung des Schaufelhalters 4 zu sehen, wobei das Zugmittel 8 und der Keil 7 sowie das Sicherungsmittel 16 nicht dargestellt sind. Die Figur 8 zeigt eindrucksvoll, dass das Frästeil 20 einfach herzustellen ist und leicht in den Schaufelhalter 4 montiert werden kann.In the FIG. 8 is a perspective view of the blade holder 4 to see, with the traction means 8 and the wedge 7 and the securing means 16 are not shown. The FIG. 8 shows impressively that the milled part 20 is easy to manufacture and can be easily mounted in the blade holder 4.

Das Frästeil 20 kann an seinen Enden kreisförmig ausgebildet sein. Dies hat den Vorteil, dass dadurch Kerbspannungen minimiert werden können.The milled part 20 may be circular at its ends. This has the advantage that it can be minimized notch stresses.

Claims (10)

  1. Turbine blade locking device (1),
    comprising a wedge (7) which is movable in an axial direction (5),
    wherein a tensioning means (8) interacts with the wedge (7) in such a way
    that the wedge (7) is movable by means of the tensioning means (8) in the axial direction (5),
    wherein the wedge (7) is formed in such a way
    that the movement of the wedge (7) in the axial direction leads to a force upon a turbine blade (2), which is to be locked, in the radial direction (6),
    characterized in that
    the tensioning means (8) has a thread (10) which engages in a complementary mating thread (12) in the wedge (7).
  2. Turbine blade locking device (1) as claimed in Claim 1, wherein the wedge (7) abuts against a corresponding abutment face (21) in the turbine blade (2) which is to be locked.
  3. Turbine blade locking device (1) as claimed in Claim 1, wherein the wedge (7) abuts against a corresponding rotor-surface abutment face (21).
  4. Turbine blade locking device (1) as claimed in Claim 3, wherein a milled piece (20) is provided, which has the rotor-surface abutment face (21).
  5. Turbine blade locking device (1) as claimed in Claim 4,
    wherein the milled piece (20) is arranged in a corresponding slot (19) of a blade holder (4).
  6. Turbine blade locking device (1) as claimed in one of the preceding claims,
    wherein a locking segment (15) is provided, which is formed in such a way that an unwanted detachment of the tensioning means (8) from the wedge (7) is prevented.
  7. Turbine blade locking device (1) as claimed in Claim 6,
    wherein the locking segment (15) is constructed as a plate, and the locking of the tensioning means (8) is carried out by bending over or flanging of the plate on the tensioning means (8).
  8. Turbine blade locking device (1) as claimed in one of the preceding claims,
    wherein a locking means (16) is provided for exerting a spring force in the radial direction (6).
  9. Turbine blade locking device (1) as claimed in Claim 3,
    wherein the locking means (16) is formed as a disk spring.
  10. Turbine blade locking device (1) as claimed in either of Claims 8 or 9,
    wherein the locking means (16) is arranged in a locking slot.
EP07802464A 2006-08-25 2007-08-02 Blade fastening means of a turbine Not-in-force EP2076656B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07802464A EP2076656B1 (en) 2006-08-25 2007-08-02 Blade fastening means of a turbine

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06017818A EP1892380A1 (en) 2006-08-25 2006-08-25 Turbine blade retention system
PCT/EP2007/058001 WO2008022890A1 (en) 2006-08-25 2007-08-02 Blade fastening means of a turbine
EP07802464A EP2076656B1 (en) 2006-08-25 2007-08-02 Blade fastening means of a turbine

Publications (2)

Publication Number Publication Date
EP2076656A1 EP2076656A1 (en) 2009-07-08
EP2076656B1 true EP2076656B1 (en) 2010-03-03

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EP06017818A Withdrawn EP1892380A1 (en) 2006-08-25 2006-08-25 Turbine blade retention system
EP07802464A Not-in-force EP2076656B1 (en) 2006-08-25 2007-08-02 Blade fastening means of a turbine

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EP06017818A Withdrawn EP1892380A1 (en) 2006-08-25 2006-08-25 Turbine blade retention system

Country Status (7)

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US (1) US8192167B2 (en)
EP (2) EP1892380A1 (en)
JP (1) JP2010501765A (en)
CN (1) CN101506475B (en)
AT (1) ATE459786T1 (en)
DE (1) DE502007003039D1 (en)
WO (1) WO2008022890A1 (en)

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IT202000003895A1 (en) * 2020-02-25 2021-08-25 Nuovo Pignone Tecnologie Srl Method for providing protective interference to axial entry blades in a rotary machine and rotary machine.
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Also Published As

Publication number Publication date
JP2010501765A (en) 2010-01-21
US20090324414A1 (en) 2009-12-31
WO2008022890A1 (en) 2008-02-28
US8192167B2 (en) 2012-06-05
DE502007003039D1 (en) 2010-04-15
CN101506475A (en) 2009-08-12
CN101506475B (en) 2013-01-23
EP1892380A1 (en) 2008-02-27
ATE459786T1 (en) 2010-03-15
EP2076656A1 (en) 2009-07-08

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