EP1130217B1 - Fixing of blades in a turbomachine - Google Patents
Fixing of blades in a turbomachine Download PDFInfo
- Publication number
- EP1130217B1 EP1130217B1 EP00810175A EP00810175A EP1130217B1 EP 1130217 B1 EP1130217 B1 EP 1130217B1 EP 00810175 A EP00810175 A EP 00810175A EP 00810175 A EP00810175 A EP 00810175A EP 1130217 B1 EP1130217 B1 EP 1130217B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- rotor blades
- recess
- roots
- blade roots
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- 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
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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
- F01D5/3023—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses
- F01D5/303—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses in a circumferential slot
- F01D5/3038—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses in a circumferential slot the slot having inwardly directed abutment faces on both sides
Definitions
- the invention relates to blades with blade roots in the circumferential grooves on Rotor of a turbomachine are attached. It particularly concerns her Mounting and securing against twisting and falling out of the groove.
- blades on a rotor of a Turbomachine to assemble is anchoring using shovel feet in T-shaped Circumferential grooves.
- To assemble the blades in a circumferential groove, in particular to allow the last shovel is a certain assembly game in the circumferential direction required.
- This Problem is solved by a reduction of the mounting game by between the shovel feet intermediate pieces are installed tightly so that the Monday game is completed. After installation of the spacers is remaining game between the shovel feet, however, often too small to free to allow thermal expansion. Due to the strains arise while forces that disturb the smoothness of the rotor and finally vibrations can cause.
- the blade roots which are anchored in circumferential grooves, each have at least one depression or opening which runs in the circumferential direction and in each of which a connecting piece is arranged which connects at least two blade roots to one blade package.
- the thus connected blade roots are thereby prevented from twisting.
- a connector consists of a shaped piece of any cross-section, and is arranged in a recess or opening, whose cross-section is adapted to the fitting.
- the recess or opening and the fitting is dimensioned so that the fitting is located with a small clearance in a recess or opening and a displacement of a blade root and the fitting relative to each other is still possible.
- the inventive compound of blade roots is the Rotational freedom of the blade roots around the blade longitudinal axis insofar reduces that they are secured against twisting and falling out. Intermediate pieces are used to partially fill in the mounting gap installed the blade feet. However, they no longer have the function of Anti-rotation of the blade feet held and now do not need so tight to be installed. As a result, free thermal expansions of Shovel feet ensured.
- the connecting piece consists of a shaped piece of rectangular cross-section, which is inserted in a likewise rectangular recess on the side of the blade root, which faces the rotor and groove bottom.
- the connecting piece consists of a round wire which is inserted in a drilling opening in the blade root. Again, the diameter of the opening and the wire is dimensioned so that a displacement of the blade root along the wire is possible.
- the blade feet each have a recess or opening on, which extends in the circumferential direction.
- the blade roots each two parallel in the circumferential direction extending depressions or openings, in each of which a connector inserted or inserted.
- a single connector is arranged in one embodiment, which extends almost over the entire circumference of a groove and almost all blade feet in this groove interconnects.
- shorter connecting pieces are arranged in the recesses or openings, which each connect two or more adjacent blade feet together to form a blade package.
- a further embodiment with two mutually parallel Recesses or openings are arranged short connectors, the connect two blade feet to a blade root pair.
- Side by side and parallel connectors are one Blade foot offset from each other by a first connector in one first recess or opening is inserted and a first and adjacent, second blade foot connects.
- a second, parallel Connector is in the second, adjacent recess or opening inserted and connects the second and adjacent, third blade root, and immediately.
- the foot of the last shovel is placed in a mounting slit intended for it in the groove screwed in and to prevent rotation by a final connector locked with the adjacent blade feet by a connector in the recess or opening of the last blade root is pulled in.
- Figure 1 illustrates a blade root 1, which is anchored in an inverse T-shaped circumferential groove 2 in a rotor 3 of a turbomachine.
- the blade root 1 has on the side facing the groove bottom, a recess 4 with a rectangular cross-section.
- a connector 5 with a similar rectangular cross-section is inserted with a small clearance in the recess.
- the cross-section of the recess in the blade root and the associated connector is basically arbitrary. Instead of the rectangular cross section for the recess and the connector, for example, elliptical or round shapes are executable.
- a round recess 6 is arranged, in which a pressing spring 7 is inserted, which additionally prevents the blade root from displacements.
- Figure 2 shows a view II of a plurality of adjacent, anchored in the circumferential groove blade roots 1, which are connected by a connecting piece 5. They form a package of blade roots, which can not twist in the circumferential groove thanks to their greater length, even if a mounting gap has arisen due to displacement of the blade roots during operation.
- the connector thus provides an anti-rotation, which makes it impossible for the blades to fall out.
- the blade roots along the entire circumferential groove are connected together in this way to form several such blade root packets. A connection of almost all blade roots, with the exception of the last or last two blades, by a single connector, is also feasible.
- FIG. 3 shows a plurality of blade roots anchored in a peripheral groove with a further arrangement of connecting pieces according to the invention.
- the blade roots 1, 1a, 1b, 1c, 1d each have on their side facing the groove bottom two parallel depressions, which are arranged on both sides of the blade root center.
- short connectors 5a, 5b, 5c are inserted.
- Each connecting piece in each case connects a blade root pair, wherein the connecting pieces arranged parallel next to one another are each offset by one blade root.
- a connecting piece 5a is inserted in the first recess of the two blade feet 1a and 1b, connecting them and securing them against rotation.
- FIGS. 4a to 4e show the assembly of the last blade of the circumferential groove and the locking of its blade root with the adjacent blade roots by means of the connecting pieces according to the invention.
- FIG. 4 a shows blade roots 11 and 12, which are spaced from the blade roots 13 and 14 by a mounting gap in the circumferential groove 2.
- the blade roots 11 and 12 are connected to each other with connecting pieces 5d and 5e. They both extend, for example, over several blade feet.
- FIG. 4b shows the same circumferential groove 2 with the last blade, the blade root 15 of which has been anchored in the mounting gap of the groove 2.
- the depressions 4 of the blade root 15 are still empty here, so the blade root is not yet secured against rotation.
- the locking of this last blade root proceeds as follows according to FIGS. 4c-e: The blade root 12 is first pushed over the remaining gap next to the blade root 15 so that the ends of the connecting pieces 5d and 5e become visible.
- the connecting piece 5d is then pulled in the same direction until its end comes to lie in the recess 4 of the blade root 12.
- the assembly and locking is completed by slightly increasing the gaps between all the blade roots in the circumferential groove, so that the gap left after the last blade has been assembled is distributed over the entire circumferential groove. Intermediate pieces fill these remaining columns. It results that almost all blade feet are secured by means of two parallel connecting pieces against rotation and the remaining blade feet are secured at least by means of a connecting piece. This ensures that none of the blades can twist and fall out of the groove.
- the spacers are a known component and are not shown here. They are dimensioned so that they can reduce the assembly game and during the turbine operation no larger gap can form, which could disturb the smoothness of the rotor. Thanks to the anti-rotation device, however, they no longer need to fill up the assembly play completely so that a sufficiently large free space remains between the blade feet, in which thermal expansions are freely granted.
Description
Die Erfindung betrifft Laufschaufeln mit Schaufelfüssen, die in Umfangsnuten am Rotor einer Turbomaschine befestigt sind. Sie betrifft insbesondere ihre Befestigung und Sicherung gegen Verdrehung und Herausfallen aus der Nut.The invention relates to blades with blade roots in the circumferential grooves on Rotor of a turbomachine are attached. It particularly concerns her Mounting and securing against twisting and falling out of the groove.
Eine bekannte Art und Weise, Laufschaufeln an einem Rotor einer Turbomaschine zu montieren, ist die Verankerung mittels Schaufelfüssen in T-förmigen Umfangsnuten. Um die Montage der Schaufeln in einer Umfangsnut, insbesondere der letzten Schaufel zu ermöglichen, ist ein gewisses Montagespiel in Umfangrichtung erforderlich. Beim Betrieb der Maschine kann es vorkommen, dass die Laufschaufeln sich verschieben und sich ein Spalt bildet, der gross genug ist, dass sich ein Schaufelfuss dreht und aus der Nut herausfällt. Dieses Problem wird durch eine Verkleinerung des Montagespiels gelöst, indem zwischen den Schaufelfüssen Zwischenstücke eng eingebaut werden, sodass das Montagespiel ausgefüllt wird. Nach Einbau der Zwischenstücke ist das verbleibende Spiel zwischen den Schaufelfüssen jedoch oft zu klein, um freie thermische Dehnungen zu ermöglichen. Aufgrund der Dehnungen entstehen dabei Kräfte, welche die Laufruhe des Rotors stören und schliesslich Vibrationen hervorrufen können. A well-known way, blades on a rotor of a Turbomachine to assemble is anchoring using shovel feet in T-shaped Circumferential grooves. To assemble the blades in a circumferential groove, in particular to allow the last shovel is a certain assembly game in the circumferential direction required. When operating the machine, it may happen that the blades shift and a gap forms, the big enough is that a blade root rotates and falls out of the groove. This Problem is solved by a reduction of the mounting game by between the shovel feet intermediate pieces are installed tightly so that the Monday game is completed. After installation of the spacers is remaining game between the shovel feet, however, often too small to free to allow thermal expansion. Due to the strains arise while forces that disturb the smoothness of the rotor and finally vibrations can cause.
DE 333353 offenbart Turbinenschaufeln mit Hammerkopf-förmigen Schaufelfüssen, die in einer Umfangsnut verankert sind. Die Schaufeln sind im Bereich ausserhalb der Nut mittels einem Draht-ähnlichen Verbindungsstück D miteinander verbunden. Die Massnahme in diesem speziellen Bereich ausserhalb der Nut dient dazu, Teile der Zentrifugalkraft des Schaufelblattes B auf die benachbarten Zwischenstücke C, die kein Schaufelblatt tragen müssen, zu übertragen. Die Anordnung ausserhalb der Nut ist vorteilhaft im Vergleich zu einer Anordnung ähnlicher Verbindungsstücke im Bereich der Nut, da dort die gewünschte Wirkung der Kraftübertragung nicht erzielt werden würde und eine Schwächung des Fussteiles resultieren würde. DE 333353 discloses turbine blades with hammerhead-shaped blade roots, which are anchored in a circumferential groove. The blades are in the area outside the Nut interconnected by means of a wire-like connector D. The Measure in this special area outside the groove is used to parts of Centrifugal force of the airfoil B on the adjacent intermediate pieces C, the do not have to carry a blade, transfer. The arrangement outside the groove is advantageous in comparison to an arrangement of similar connectors in the Area of the groove, because there does not achieve the desired effect of power transmission would result in a weakening of the foot part.
Es ist hieraus die Aufgabe der Erfindung, eine Befestigung von Laufschaufeln mit Schaufelfüssen in Umfangsnuten am Rotor einer Turbomaschine zu schaffen, die eine Verdrehung und ein Herausfallen der Schaufelfüsse verhindert und zugleich ein genügend grosses Spiel für freie thermische Dehnungen gewährt.It is therefore the object of the invention to provide a mounting of blades To create blade roots in circumferential grooves on the rotor of a turbomachine, the prevents rotation and falling out of the blade roots and at the same time granted a sufficiently large game for free thermal expansions.
Diese Aufgabe ist durch eine Schaufelbefestigung gemäss dem Anspruch 1
gelöst.
Die Schaufelfüsse, welche in Umfangsnuten verankert sind, weisen
erfindungsgemäss jeweils mindestens eine Vertiefung oder Öffnung auf, die in
Umfangsrichtung verläuft und in denen jeweils ein Verbindungsstück angeordnet
ist, das mindestens zwei Schaufelfüsse miteinander zu einem Schaufelpaket
verbindet.
Die so verbundenen Schaufelfüsse werden dadurch an einer Verdrehung
gehindert. Ein Verbindungsstück besteht aus einem Formstück eines beliebigen
Querschnitts, und ist in einer Vertiefung oder Öffnung angeordnet, dessen
Querschnitt dem Formstück angepasst ist. Dabei ist die Vertiefung oder Öffnung
sowie das Formstück so dimensioniert, dass das Formstück mit kleinem Spiel in
einer Vertiefung oder Öffnung liegt und eine Verschiebung eines Schaufelfusses
und des Formstücks relativ zueinander noch möglich ist.This object is achieved by a blade attachment according to
According to the invention, the blade roots, which are anchored in circumferential grooves, each have at least one depression or opening which runs in the circumferential direction and in each of which a connecting piece is arranged which connects at least two blade roots to one blade package.
The thus connected blade roots are thereby prevented from twisting. A connector consists of a shaped piece of any cross-section, and is arranged in a recess or opening, whose cross-section is adapted to the fitting. In this case, the recess or opening and the fitting is dimensioned so that the fitting is located with a small clearance in a recess or opening and a displacement of a blade root and the fitting relative to each other is still possible.
Durch die erfindungsgemässe Verbindung von Schaufelfüssen ist die Rotationsfreiheit der Schaufelfüsse um die Schaufel-Längsachse insofern reduziert, dass sie vor einer Verdrehung und einem Herausfallen gesichert sind. Zwischenstücke werden zum teilweisen Auffüllen des Montagespalts zwischen den Schaufelfüssen eingebaut. Sie haben jedoch nicht mehr die Funktion der Verdrehsicherung der Schaufelfüsse inne und brauchen nunmehr nicht so eng eingebaut zu werden. Dadurch sind freie thermische Dehnungen der Schaufelfüsse gewährleistet. The inventive compound of blade roots is the Rotational freedom of the blade roots around the blade longitudinal axis insofar reduces that they are secured against twisting and falling out. Intermediate pieces are used to partially fill in the mounting gap installed the blade feet. However, they no longer have the function of Anti-rotation of the blade feet held and now do not need so tight to be installed. As a result, free thermal expansions of Shovel feet ensured.
In einer ersten Ausführung der Erfindung besteht das Verbindungsstück aus
einem Formstück von rechteckigem Querschnitt, das in einer ebenfalls
rechteckigen Vertiefung an der Seite des Schaufelfusses eingelegt ist, die dem
Rotor und Nutboden zugewandt ist.
In einer zweiten Ausführung der Erfindung besteht das Verbindungsstück aus
einem runden Draht, der in einer Bohr-Öffnung im Schaufelfuss eingeschoben ist.
Wiederum ist der Durchmesser der Öffnung und des Drahtes so dimensioniert,
dass eine Verschiebung des Schaufelfusses entlang dem Draht möglich ist.In a first embodiment of the invention, the connecting piece consists of a shaped piece of rectangular cross-section, which is inserted in a likewise rectangular recess on the side of the blade root, which faces the rotor and groove bottom.
In a second embodiment of the invention, the connecting piece consists of a round wire which is inserted in a drilling opening in the blade root. Again, the diameter of the opening and the wire is dimensioned so that a displacement of the blade root along the wire is possible.
In einer Variante weisen die Schaufelfüsse jeweils eine Vertiefung oder Öffnung auf, die sich in Umfangsrichtung erstreckt. In einer weiteren Variante der Erfindung weisen die Schaufelfüsse jeweils zwei in Umfangsrichtung parallel verlaufende Vertiefungen oder Öffnungen auf, in die je ein Verbindungsstück eingelegt bzw. eingeschoben wird.In one variant, the blade feet each have a recess or opening on, which extends in the circumferential direction. In another variant of the Invention, the blade roots each two parallel in the circumferential direction extending depressions or openings, in each of which a connector inserted or inserted.
In Anbetracht der thermischen Dehnungen der Turbinenteile und Montage der
Schaufelfüsse sind verschiedene Längen des Verbindungsstücks ausführbar.
Hierzu ist in einer Ausführung ein einziges Verbindungsstück angeordnet, das sich
fast über den gesamten Umfang einer Nut erstreckt und fast alle Schaufelfüsse in
dieser Nut miteinander verbindet.
In einer weiteren Ausführung sind in den Vertiefungen oder Öffnungen kürzere
Verbindungsstücke angeordnet, die jeweils zwei oder mehrere benachbarte
Schaufelfüsse miteinander zu einem Schaufelpaket verbinden.In view of the thermal expansions of the turbine parts and assembly of the blade roots different lengths of the connector are executable. For this purpose, a single connector is arranged in one embodiment, which extends almost over the entire circumference of a groove and almost all blade feet in this groove interconnects.
In a further embodiment, shorter connecting pieces are arranged in the recesses or openings, which each connect two or more adjacent blade feet together to form a blade package.
In einer weiteren Ausführung mit zwei parallel zueinander verlaufenden Vertiefungen oder Öffnungen sind kurze Verbindungsstücke angeordnet, die jeweils zwei Schaufelfüsse zu einem Schaufelfusspaar miteinander verbinden. Nebeneinander und parallel angeordnete Verbindungsstücke sind dabei um einen Schaufelfuss voneinander versetzt, indem ein erstes Verbindungsstück in eine erste Vertiefung oder Öffnung eingelegt ist und einen ersten und benachbarten, zweiten Schaufelfuss verbindet. Ein zweites, parallel verlaufendes Verbindungsstück ist in die zweite, nebenliegenden Vertiefung oder Öffnung eingelegt und verbindet den zweiten und benachbarten, dritten Schaufelfuss, und so fort.In a further embodiment with two mutually parallel Recesses or openings are arranged short connectors, the connect two blade feet to a blade root pair. Side by side and parallel connectors are one Blade foot offset from each other by a first connector in one first recess or opening is inserted and a first and adjacent, second blade foot connects. A second, parallel Connector is in the second, adjacent recess or opening inserted and connects the second and adjacent, third blade root, and immediately.
Der Fuss der letzten Schaufel wird in einen für ihn vorgesehene Montagespalt in die Nut eingedreht und zur Verdrehsicherung durch ein Schlussverbindungsstück mit den benachbarten Schaufelfüssen verriegelt, indem ein Verbindungsstück in die Vertiefung oder Öffnung des letzten Schaufelfusses hineingezogen wird.The foot of the last shovel is placed in a mounting slit intended for it in the groove screwed in and to prevent rotation by a final connector locked with the adjacent blade feet by a connector in the recess or opening of the last blade root is pulled in.
In einer weiteren Ausführung der erfindungsgemässen Schaufelbefestigung ist an der dem Nutboden zugewandten Seite des Schaufelfusses jeweils in einer Vertiefung eine Anpressfeder angeordnet, welche eine Verschiebung der Schaufel auf dem Rotor weiter reduziert, sodass eine Spaltbildung und daraus resultierende aerodynamische Nachteile vermieden werden.In a further embodiment of the inventive blade attachment is on the groove bottom facing side of the blade root in each case Well a pressure spring arranged, which is a displacement of the blade further reduced on the rotor, allowing a gap formation and resulting aerodynamic disadvantages are avoided.
Für die Realisierung der erfindungsgemässen Befestigung sind nur Arbeiten an den Schaufelfüssen erforderlich, während der Rotor bestehen bleibt. Diese Befestigung ist deshalb insbesondere für Retrofit an bestehenden Maschinen geeignet.For the realization of the inventive attachment are only work on the blades feet required while the rotor remains. These Fastening is therefore particularly suitable for retrofitting existing machines suitable.
Es zeigen:
Figur 1 stellt einen Schaufelfuss 1 dar, der in einer invers-T-förmigen Umfangsnut
2 in einem Rotor 3 einer Turbomaschine verankert ist. Der Schaufelfuss 1 weist
an der Seite, welche dem Nutboden zugewandt ist, eine Vertiefung 4 mit einem
rechteckigen Querschnitt auf. Ein Verbindungsstück 5 mit einem ähnlich
rechteckigen Querschnitt ist mit einem kleinen Spiel in der Vertiefung eingelegt.
Der Querschnitt der Vertiefung im Schaufelfuss und des zugehörigen
Verbindungsstücks ist grundsätzlich beliebig. Anstelle des rechteckigen
Querschnitts für die Vertiefung und das Verbindungsstück sind zum Beispiel auch
elliptische oder runde Formen ausführbar.
In der Mitte der dem Nutboden zugewandten Seite des Schaufelfusses ist eine
runde Vertiefung 6 angeordnet, in der eine Pressfeder 7 eingelegt ist, die den
Schaufelfuss zusätzlich an Verschiebungen hindert.
Figur 2 zeigt eine Ansicht II von mehreren benachbarten, in der Umfangsnut
verankerten Schaufelfüssen 1, die durch ein Verbindungsstück 5 verbunden sind.
Sie bilden ein Paket von Schaufelfüssen, welches sich in der Umfangsnut dank
ihrer grösseren Länge nicht verdrehen kann, auch wenn durch Verschiebung der
Schaufelfüsse während des Betriebs ein Montagespalt entstanden ist. Das
Verbindungsstück gewährt somit eine Verdrehsicherung, die ein Herausfallen der
Schaufeln verunmöglicht.
Die Schaufelfüsse entlang der gesamten Umfangsnut werden auf diese Art zu
mehreren solcher Schaufelfuss-Paketen miteinander verbunden. Eine Verbindung
von fast allen Schaufelfüssen, mit Ausnahme der letzten oder zwei letzten
Schaufeln, durch ein einziges Verbindungsstück, ist ebenfalls ausführbar. Figure 1 illustrates a
In the middle of the groove bottom facing side of the blade root a
Figure 2 shows a view II of a plurality of adjacent, anchored in the circumferential
The blade roots along the entire circumferential groove are connected together in this way to form several such blade root packets. A connection of almost all blade roots, with the exception of the last or last two blades, by a single connector, is also feasible.
Figur 3 zeigt mehrere Schaufelfüsse in einer Umfangsnut verankert mit einer
weiteren erfindungsgemässen Anordnung von Verbindungsstücken. Die
Schaufelfüsse 1, 1a,1b,1c,1d weisen jeweils an ihrer dem Nutboden zugewandten
Seite zwei parallel verlaufende Vertiefungen auf, die beidseits der
Schaufelfussmitte angeordnet sind. In beiden Vertiefungen sind kurze
Verbindungsstücke 5a, 5b, 5c eingelegt. Jedes Verbindungsstück verbindet
jeweils ein Schaufelfusspaar, wobei die parallel nebeneinander angeordneten
Verbindungsstücke jeweils um einen Schaufelfuss versetzt sind. Beispielsweise ist
ein Verbindungsstück 5a in der ersten Vertiefung der zwei Schaufelfüsse 1a und
1b eingelegt, wobei es diese verbindet und gegen eine Verdrehung sichert. Ein
zweites Verbindungsstück 5b ist in der zweiten, parallel verlaufenden Vertiefung
der Schaufelfüsse 1b und 1c eingelegt, wobei es dieses Schaufelfusspaar
verbindet. Das nächste Verbindungsstück 5c ist wiederum in der Vertiefung auf
der ersten Seite der Schaufelfüsse eingelegt und verbindet die Schaufelfüsse 1c
und 1d.
In den Figuren 4a bis 4e ist die Montage der letzten Schaufel der Umfangsnut und
die Verriegelung ihres Schaufelfusses mit den benachbarten Schaufelfüssen
mittels den erfindungsgemässen Verbindungsstücken dargestellt.
Figur 4a zeigt Schaufelfüsse 11 und 12, die von den Schaufelfüssen 13 und 14
durch einen Montagespalt in der Umfangsnut 2 beabstandet sind. Die
Schaufelfüsse 11 und 12 sind mit Verbindungsstücken 5d und 5e miteinander
verbunden. Sie erstrecken sich beide beispielsweise über mehrere Schaufelfüsse.
Die Schaufelfüsse 13 und 14 sind mittels Verbindungsstücken 5f und 5g
miteinander verbunden und gesichert.
Figur 4b zeigt dieselbe Umfangsnut 2 mit der letzten Schaufel, deren Schaufelfuss
15 in dem Montagespalt der Nut 2 verankert worden ist. Die Vertiefungen 4 des
Schaufelfusses 15 sind hier noch leer, der Schaufelfuss also noch nicht gegen
Verdrehung gesichert. Die Verriegelung dieses letzten Schaufelfusses verläuft wie
folgt gemäss den Figuren 4c-e: Der Schaufelfuss 12 wird zunächst über den
verbleibenden Spalt hinweg neben den Schaufelfuss 15 geschoben, sodass die
Enden der Verbindungsstücke 5d und 5e sichtbar werden. Das Verbindungsstück
5d wird sodann in dieselbe Richtung gezogen bis sein Ende in der Vertiefung 4
des Schaufelfusses 12 zu liegen kommt. Die Montage und Verriegelung wird
vervollständigt, indem die Spalten zwischen sämtlichen Schaufelfüssen in der
Umfangsnut leicht vergrössert werden, sodass der Spalt, der nach der Montage
der letzten Schaufel verblieben ist, über die ganze Umfangsnut verteilt wird.
Mittels Zwischenstücken werden diese verbleibenden Spalten aufgefüllt.
Es resultiert, dass fast alle Schaufelfüsse mittels zwei parallel verlaufenden
Verbindungsstücken gegen Verdrehung gesichert sind und die übrigen
Schaufelfüsse zumindest mittels einem Verbindungsstück gesichert sind. Dadurch
ist gewährleistet, dass keine der Schaufeln sich verdrehen und aus der Nut fallen
kann.
Die Zwischenstücke sind ein bekanntes Bauteil und sind hier nicht dargestellt. Sie
sind so dimensioniert, dass sie das Montagespiel verkleinern und sich während
des Turbinenbetriebs kein grösserer Spalt mehr bilden kann, welcher die Laufruhe
des Rotors stören könnte. Dank der Verdrehsicherung brauchen sie das
Montagespiel jedoch nicht mehr restlos aufzufüllen, sodass zwischen den
Schaufelfüssen ein genügend grosser freier Raum verbleibt, in dem thermische
Dehnungen frei gewährt sind. FIG. 3 shows a plurality of blade roots anchored in a peripheral groove with a further arrangement of connecting pieces according to the invention. The
FIGS. 4a to 4e show the assembly of the last blade of the circumferential groove and the locking of its blade root with the adjacent blade roots by means of the connecting pieces according to the invention.
FIG. 4 a
FIG. 4b shows the same
It results that almost all blade feet are secured by means of two parallel connecting pieces against rotation and the remaining blade feet are secured at least by means of a connecting piece. This ensures that none of the blades can twist and fall out of the groove.
The spacers are a known component and are not shown here. They are dimensioned so that they can reduce the assembly game and during the turbine operation no larger gap can form, which could disturb the smoothness of the rotor. Thanks to the anti-rotation device, however, they no longer need to fill up the assembly play completely so that a sufficiently large free space remains between the blade feet, in which thermal expansions are freely granted.
- 1, 1a-1d, 11-151, 1a-1d, 11-15
- Schaufelfussblade root
- 22
- Umfangsnutcircumferential groove
- 33
- Rotorrotor
- 44
- Vertiefungdeepening
- 5, 5a-g5, 5a-g
- Verbindungsstückjoint
- 66
- Vertiefungdeepening
- 77
- Anpressfederpressure spring
Claims (9)
- Rotor blades on a rotor (3) of a turbomachine, the rotor blades each having a blade root in the form of a T or hammerhead (1) which is anchored in a peripheral groove (2) on the rotor (3) of the turbomachine, characterized in that the rotor blades in the region of the hammerhead (1) are secured against twisting in order to prevent them falling out of the peripheral groove, the blade root having a recess (4) or opening running in the longitudinal direction of the peripheral groove in the region of the hammerhead (1) and a connecting piece (5) arranged in the recess (4) or opening, which connecting piece (5) extends over at least two blade roots in the region of the hammerhead (1), wherein installation clearance for accommodating thermal expansions is present between the rotor blades in the peripheral groove (2) and the connecting piece can be displaced relative to the blade roots.
- Rotor blades according to Claim 1, characterized in that the blade roots (1) each have two recesses (4) or openings, in each of which a connecting piece is arranged.
- Rotor blades according to Claim 1 or 2, characterized in that the at least one recess (4) is respectively arranged on the side of the blade root (1) facing towards the bottom of the groove of the peripheral groove (2) and has a rectangular cross section, and in that the connecting piece (5), which is laid in each case into the at least one recess (4), is a shaped piece of the same rectangular cross section.
- Rotor blades according to Claim 1 or 2, characterized in that the opening on the blade root (1) is a bore opening and in that the connecting piece consists of a wire of the same diameter which is pushed into the bore opening.
- Rotor blades according to one of Claims 1 to 4, characterized in that the connecting pieces (5) extend over almost the complete periphery of the groove and connect almost all the blade roots (1) to form one blade pack.
- Rotor blades according to one of Claims 1 to 4, characterized in that the connecting pieces (5) extend over two or more blade roots (1) and connect the latter to form a plurality of blade packs.
- Rotor blades according to Claim 6, characterized in that each of the blade roots (2) has two recesses (4) or openings and the connecting pieces (5) each extend over two blade roots (1) and in that the connecting pieces, which are arranged parallel to one another, are arranged offset by one blade root.
- Rotor blades according to one of Claims 1 to 7, characterized in that each of the blade roots (1) has a round recess (6) in which a contact pressure spring (7) is arranged.
- Rotor blades according to one of Claims 1 to 7, characterized in that the last blade root (1) assembled into the peripheral groove (2) is locked to the adjacent blade roots by displacing one or two connecting pieces (5d, 5e).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP00810175A EP1130217B1 (en) | 2000-03-01 | 2000-03-01 | Fixing of blades in a turbomachine |
| DE50010348T DE50010348D1 (en) | 2000-03-01 | 2000-03-01 | Attachment of blades in a turbomachine |
| US09/794,050 US20010019697A1 (en) | 2000-03-01 | 2001-02-28 | Fastening rotor blades in a turbomachine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP00810175A EP1130217B1 (en) | 2000-03-01 | 2000-03-01 | Fixing of blades in a turbomachine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1130217A1 EP1130217A1 (en) | 2001-09-05 |
| EP1130217B1 true EP1130217B1 (en) | 2005-05-18 |
Family
ID=8174578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00810175A Expired - Lifetime EP1130217B1 (en) | 2000-03-01 | 2000-03-01 | Fixing of blades in a turbomachine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20010019697A1 (en) |
| EP (1) | EP1130217B1 (en) |
| DE (1) | DE50010348D1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005010323A1 (en) * | 2003-07-26 | 2005-02-03 | Alstom Technology Ltd | Device for fixing the blade root on a turbomachine |
| US7474643B2 (en) * | 2003-10-02 | 2009-01-06 | Qualcomm Incorporated | Systems and methods for communicating control data using multiple slot formats |
| EP1707746A1 (en) * | 2005-03-18 | 2006-10-04 | Siemens Aktiengesellschaft | Turbomachine component, turbomachine and method for attaching blades on a component |
| EP2045444B1 (en) * | 2007-10-01 | 2015-11-18 | Alstom Technology Ltd | Rotor blade, method for producing a rotor blade, and compressor with such a rotor blade |
| CH702203A1 (en) * | 2009-11-10 | 2011-05-13 | Alstom Technology Ltd | Rotor for axial flow turbomachine i.e. gas turbine, in combined cycle power plant, has rotating blades inserted into groove, and blade root comprising inverted-T root with hammer head and adapted to base area of groove in radial direction |
| EP2320030B1 (en) * | 2009-11-10 | 2012-12-19 | Alstom Technology Ltd | Rotor and rotor blade for an axial turbomachine |
| DE102010053141B4 (en) * | 2009-12-07 | 2018-10-11 | General Electric Technology Gmbh | Turbine aggregate with possible over-rotation of the foot of a blade to the installation of a last blade |
| EP2562356A1 (en) * | 2011-08-24 | 2013-02-27 | Siemens Aktiengesellschaft | Blade assembly |
| GB201203303D0 (en) | 2012-02-27 | 2012-04-11 | Rolls Royce Plc | Balancing of rotor |
| US11773750B2 (en) * | 2022-01-05 | 2023-10-03 | General Electric Company | Turbomachine component retention |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE459203C (en) * | 1928-04-27 | E H Hans Holzwarth Dr Ing | Device for fastening blades for steam and gas turbines | |
| DE333353C (en) * | 1920-04-16 | 1921-03-18 | Osthoff Fa Walter | Tissue narrowing machine |
| GB614678A (en) * | 1946-07-19 | 1948-12-20 | Parsons C A & Co Ltd | Improvements in or relating to turbine blading or the like |
| US2809801A (en) * | 1952-04-18 | 1957-10-15 | Ingersoll Rand Co | Turbine rotor construction |
| CH494341A (en) * | 1968-07-26 | 1970-07-31 | Sulzer Ag | Rotor for turbo machinery |
| FR2680828A1 (en) * | 1991-08-28 | 1993-03-05 | Sev Motorola | TURBOMACHINE ROTOR WITH IMPROVED ANGULAR POSITIONING OF AUBES. |
| US5509784A (en) * | 1994-07-27 | 1996-04-23 | General Electric Co. | Turbine bucket and wheel assembly with integral bucket shroud |
-
2000
- 2000-03-01 EP EP00810175A patent/EP1130217B1/en not_active Expired - Lifetime
- 2000-03-01 DE DE50010348T patent/DE50010348D1/en not_active Expired - Lifetime
-
2001
- 2001-02-28 US US09/794,050 patent/US20010019697A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20010019697A1 (en) | 2001-09-06 |
| DE50010348D1 (en) | 2005-06-23 |
| EP1130217A1 (en) | 2001-09-05 |
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