EP1862638B1 - Method for repairing the rotor of a gas turbine and rotor of a gas turbine - Google Patents
Method for repairing the rotor of a gas turbine and rotor of a gas turbine Download PDFInfo
- Publication number
- EP1862638B1 EP1862638B1 EP07107597A EP07107597A EP1862638B1 EP 1862638 B1 EP1862638 B1 EP 1862638B1 EP 07107597 A EP07107597 A EP 07107597A EP 07107597 A EP07107597 A EP 07107597A EP 1862638 B1 EP1862638 B1 EP 1862638B1
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- EP
- European Patent Office
- Prior art keywords
- bridge segments
- rotor
- axis
- heat shield
- groove
- 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.)
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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
- F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
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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
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/08—Heating, heat-insulating or cooling means
- F01D5/081—Cooling fluid being directed on the side of the rotor disc or at the roots of the blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/08—Heating, heat-insulating or cooling means
- F01D5/085—Heating, heat-insulating or cooling means cooling fluid circulating inside the rotor
Definitions
- the present invention relates to the field of gas turbines. It relates to a method for repairing the rotor of a gas turbine according to the preamble of claim 1 and to a rotor according to the preamble of claim 8.
- a plurality of blade receptacles 18 are arranged in succession, next to which heat damper carriers 14 are provided for fastening heat shield segments (not shown).
- heat shield segments not shown
- Thedeluftnut 16 is spanned by a welded bridge construction.
- the heat accumulation segments are installed to protect the rotor 10 from direct hot gas.
- a repair measure makes it possible to remanufacture by removing the damaged area in the groove bottom 16a.
- two repair measures have been developed, a temporary and a long-lasting repair (also referred to in the document mentioned above as "micro” repair and "macro” repair).
- the main difference between the two repair measures is the open bridge construction for the temporary repair and a re-welded bridge construction for the long-lasting repair. In order to ensure access for the tool, it is necessary to sever the heat shield bridges for the execution of the repair measure.
- a disadvantage of the known repair measures that in the temporary repair measure no pressure forces can be transmitted above the groove, and that the rewelding of the heat shield bridge in the process of long-lasting repair measure is time consuming and expensive. Among other things, a heat treatment is required to reduce residual stresses during welding. Furthermore, an on-site implementation in the long-term repair measure is not possible.
- An embodiment of the method according to the invention is characterized in that the new bridge segments are additionally secured against radially outward forces.
- the new bridge segments are additionally secured against radially outward forces.
- the groove-like recesses may each be formed as annular grooves which extend concentrically to an axial axis of rotation, wherein the mounting feet of the new bridge segments have a corresponding ring shape, and in the assembly of the new bridge segments, the new bridge segments with the mounting feet about the axis of rotation be screwed into the annular grooves.
- the groove-like recesses may each be formed as annular grooves, which extend concentrically to a radial axis of rotation, wherein the mounting feet of the bridge segments have a corresponding annular shape, and screwed during assembly of the new bridge segments, the new bridge segments with the mounting feet about the axis of rotation in the annular grooves become.
- the abutting connecting walls of the new bridge segments and the heat spine carrier can be designed as concentric with the axis of rotation oriented cylindrical surfaces.
- An embodiment of the rotor according to the invention is characterized in that the bridge segments are additionally secured against radially outwardly acting forces, that for securing the new bridge segments against radially outward acting forces a positive connection between the heat spine carrier and the new bridge segments is provided, and that for the production the positive connection in the cooling air groove are provided laterally in the axial direction groove-like recesses, in which engage the bridge segments with issued in the axial direction mounting feet.
- the groove-like recesses may each be formed as annular grooves which extend concentrically to an axial axis of rotation, wherein the mounting feet of the bridge segments have a corresponding annular shape.
- the bridge segments and the heat spine carrier are preferably designed as cylindrical surfaces oriented concentrically to the axis of rotation.
- the basic idea of the present invention is to simplify the repair-related installation of heat spine bridges by jamming the bridge segments in the GT rotor.
- bridge segments are used there by clamping, where a welded bridge connection was present before the cooling air groove was removed. This can be done in different ways.
- FIG. 3-5 an embodiment of the inventive method is shown.
- the figures show a perspective view of a section of a rotor 10 of a gas turbine, which has a rotating blade receptacle 18.
- a heat accumulator carrier 14 is arranged next to the rotor blade receptacle 18, which is cut by the circumferential, curveddeluftnut 16 '. Extending in the axial direction are distributed around the circumference of the rotor 10 in the heat accumulation segment carrier 14 heat accumulation receptacles 15, can be inserted into the heat accumulation segments, not shown.
- the radially outwardly projecting portions 28 of the heat accumulator support 14 located between the heat accumulator receivers 15 are cut by the cooling air groove 16 '.
- the cut-through areas are bridged by new bridge segments 20 inserted by clamping, which are adapted to the left-standing sections 28 in the cross-sectional profile.
- the end faces of the bridge segments 20 are oriented flat and perpendicular to the axis 11 of the rotor 10. The same applies to the connection levels of the remaining portions 28 of the heat spine carrier 14.
- the new bridge segments 20 are additionally secured against radially outwardly acting forces.
- Fig. 3-5 are for the production of positive engagement in the curveddeluftnut 16 'laterally opposite groove-like recesses introduced in the axial direction, which are each formed as annular grooves 23, 24 and concentric with a (in the Fig. 2-5 not shown) axial axis of rotation.
- the annular grooves 23, 24 engage the new bridge segments 20 with issued in the axial direction, formed on the end faces mounting feet 21, 22 a.
- the mounting feet 21, 22 of the new bridge segments 20 have a corresponding ring shape, so that during assembly of the new bridge segments 20 they must be screwed with the mounting feet 21, 22 about the axial axis of rotation in the annular grooves 23, 24, as in Fig. 4 for a second bridge segment 20 is shown.
- the groove-like recesses are each formed as annular grooves 23 ', 24', which extend concentrically to a radial axis of rotation 27.
- the mounting feet 21 ', 22' at the end faces of the new bridge segments 20 ' have a corresponding ring shape, so that during assembly of the new bridge segments 20' with the mounting feet 21 ', 22' about the axis of rotation 27 in the annular grooves 23 ', 24 'are screwed in, as in Fig. 6 for a second bridge segment 20 is shown.
- the adjoining connecting walls 25, 26 of the new bridge segments 20 'and of the heat accumulator carrier 14 are designed as cylindrical surfaces oriented concentrically to the axis of rotation 27.
- the invention allows welded gas turbine rotors, in which bridge segments with the aim of improving the rigidity and thus the cyclic life of the rotor, without a welded joint can be installed.
- bridge segments with the aim of improving the rigidity and thus the cyclic life of the rotor, without a welded joint can be installed.
- an optimization of the load distribution in life-time-determined areas on turned grooves and a seal against cooling air leakage is achieved in a simplified manner.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Die vorliegende Erfindung bezieht sich auf das Gebiet der Gasturbinen. Sie betrifft ein Verfahren zum Reparieren des Rotors einer Gasturbine gemäss dem Oberbegriff des Anspruchs 1 sowie einen Rotor gemäss dem Oberbegriff des Anspruchs 8.The present invention relates to the field of gas turbines. It relates to a method for repairing the rotor of a gas turbine according to the preamble of claim 1 and to a rotor according to the preamble of claim 8.
In der Rotorkühlluftgeometrie von GT-Rotoren der Typen 11 D/N, 13B-D der Anmelderin wurden in Felduntersuchungen Rissanzeigen im Nutgrund der GT-Kühlluftnut gefunden, die nachweislich durch zyklischen Betrieb der Maschinen verursacht wurden (siehe dazu
Die Kühlluftnut 16 wird von einer verschweissten Brückenkonstruktion überspannt. In die so entstehende Brückenkonstruktion werden die Wärmestausegmente eingebaut, um den Rotor 10 vor direktem Heissgas zu schützen. Eine Reparaturmassnahme ermöglicht es, durch Entfernern des geschädigten Bereiches im Nutgrund 16a einen Weiterbetrieb zu ermöglichen. Es wurden bisher zwei Reparaturmassnahmen entwickelt, eine temporäre und eine langlebige Reparatur (in der eingangs genannten Druckschrift auch als "Mikro"-Reparatur und "Makro"-Reparatur bezeichnet). Der wesentliche Unterschied der beiden Reparaturmassnahmen besteht in einer offengelassenen Brückenkonstruktion für die temporäre Reparatur und einer wiederverschweissten Brückenkonstruktion für die langlebige Reparatur. Um den Zugang für das Werkzeug sicherzustellen, müssen dabei die Wärmestausegmentbrücken für die Ausführung der Reparaturmassnahme durchtrennt werden.The Kühlluftnut 16 is spanned by a welded bridge construction. In the resulting bridge construction, the heat accumulation segments are installed to protect the
Für die langlebige Reparaturmassnahme erfolgt ein aufwändiges Wiederverschweissen der Brückenkonstruktion nach Eindrehen der optimierten Nutgeometrie. Dies ist notwendig, da neben der Dichtungsfunktion Festigkeitsrechnungen zeigen, dass die Brücken die Steifigkeit erhöhen und entsprechend auch eine höhere zyklische Lebensdauer in der Kühlluftnutgeometrie (Nutgrund 16a) bewirken.For the long-lasting repair measure, a time-consuming rewelding of the bridge construction takes place after the optimized groove geometry has been screwed in. This is necessary because, in addition to the sealing function, strength calculations show that the bridges increase the rigidity and, correspondingly, also bring about a greater cyclic service life in the cooling-air groove geometry (
Nachteilig ist bei den bekannten Reparaturmassnahmen, dass bei der temporären Reparaturmassnahme keine Druckkräfte oberhalb der Nut übertragen werden können, und dass das Wiederverschweissen der Wärmestausegmentbrücken im Prozess der langlebigen Reparaturmassnahme zeitaufwendig und teuer ist. Unter anderem ist eine Wärmebehandlung erforderlich, um beim Schweissen entstehende Eigenspannungen zu verringern. Ferner ist eine On-Site-Durchführung bei der langlebigen Reparaturmassnahme nicht möglich.A disadvantage of the known repair measures that in the temporary repair measure no pressure forces can be transmitted above the groove, and that the rewelding of the heat shield bridge in the process of long-lasting repair measure is time consuming and expensive. Among other things, a heat treatment is required to reduce residual stresses during welding. Furthermore, an on-site implementation in the long-term repair measure is not possible.
Ein weiteres Verfahren zum Reparieren eines Rotors mit den Merkmalen des Oberbegriffs von Anspruch 1 zeigt das Dokument
Es ist daher Aufgabe der Erfindung, ein Reparaturverfahren für einen Rotor der beschriebenen Art zu schaffen, welches einerseits mit reduziertem Aufwand und On-Site anwendbar ist, und andererseits gegenüber der offengelassenen Nut deutlich verbesserte Ergebnisse erzielt, sowie einen entsprechenden Rotor anzugeben.It is therefore an object of the invention to provide a repair method for a rotor of the type described, which is applicable on the one hand with reduced effort and on-site, and on the other hand compared to the open groove achieved significantly improved results, and to provide a corresponding rotor.
Die Aufgabe wird durch die Gesamtheit der Merkmale der Ansprüche 1 und 8 gelöst. Wesentlich für die Erfindung ist, dass nach dem Ausdrehen der Kühlluftnut neue Brückensegmente eingesetzt werden, dass aber die neuen Brückensegmente im Wärmestausegmentträger lediglich verklemmt werden. Durch den Klemmsitz ist es möglich, Druckkräfte über die Brückensegmente zu übertragen. Darüber hinaus haben die eingeklemmten Brückensegmente eine Dichtfunktion gegenüber der Kühlluftnut.The object is solved by the entirety of the features of claims 1 and 8. Essential for the invention is that after the turning of the Kühlluftnut new bridge segments are used, but that the new bridge segments are only jammed in the heat accumulator carrier. Due to the clamping seat, it is possible to transmit compressive forces on the bridge segments. In addition, the jammed bridge segments have a sealing function with respect to the Kühlluftnut.
Eine Ausgestaltung des erfindungsgemässen Verfahrens zeichnet sich dadurch aus, dass die neuen Brückensegmente zusätzlich gegen radial nach aussen wirkende Kräfte gesichert werden. Insbesondere wird zum Absichern der neuen Brückensegmente gegen radial nach aussen wirkende Kräfte ein Formschluss zwischen dem Wärmestausegmentträger und den neuen Brückensegmenten hergestellt.An embodiment of the method according to the invention is characterized in that the new bridge segments are additionally secured against radially outward forces. In particular, to secure the new bridge segments against radially outward acting forces a positive connection between the heat spine carrier and the new bridge segments produced.
Zur Herstellung des Formschlusses werden vorzugsweise in die ausgedrehte Kühlluftnut seitlich in axialer Richtung nutartige Vertiefungen eingebracht, in welche die neuen Brückensegmente mit in axialer Richtung ausgestellten Befestigungsfüssen eingreifen.To produce the positive locking groove-like recesses are preferably introduced into the curved Kühlluftnut laterally in the axial direction, in which engage the new bridge segments with issued in the axial direction mounting feet.
Insbesondere können zur Erleichterung der Montage die nutartigen Vertiefungen jeweils als Ringnuten ausgebildet werden, die konzentrisch zu einer axialen Drehachse verlaufen, wobei die Befestigungsfüsse der neuen Brückensegmente eine entsprechende Ringform aufweisen, und bei der Montage der neuen Brückensegmente die neuen Brückensegmente mit den Befestigungsfüssen um die Drehachse in die Ringnuten eingedreht werden.In particular, to facilitate assembly, the groove-like recesses may each be formed as annular grooves which extend concentrically to an axial axis of rotation, wherein the mounting feet of the new bridge segments have a corresponding ring shape, and in the assembly of the new bridge segments, the new bridge segments with the mounting feet about the axis of rotation be screwed into the annular grooves.
Alternativ dazu können die nutartigen Vertiefungen jeweils als Ringnuten ausgebildet werden, die konzentrisch zu einer radialen Drehachse verlaufen, wobei die Befestigungsfüsse der Brückensegmente eine entsprechende Ringform aufweisen, und bei der Montage der neuen Brückensegmente die neuen Brückensegmente mit den Befestigungsfüssen um die Drehachse in die Ringnuten eingedreht werden.Alternatively, the groove-like recesses may each be formed as annular grooves, which extend concentrically to a radial axis of rotation, wherein the mounting feet of the bridge segments have a corresponding annular shape, and screwed during assembly of the new bridge segments, the new bridge segments with the mounting feet about the axis of rotation in the annular grooves become.
Darüber hinaus können die aneinanderstossenden Anschlusswände der neuen Brückensegmente und des Wärmestausegmentträgers als konzentrisch zur Drehachse orientierte Zylinderflächen ausgebildet sein.In addition, the abutting connecting walls of the new bridge segments and the heat spine carrier can be designed as concentric with the axis of rotation oriented cylindrical surfaces.
Eine Ausgestaltung des erfindungsgemässen Rotors ist dadurch gekennzeichnet, dass die Brückensegmente zusätzlich gegen radial nach aussen wirkende Kräfte gesichert sind, dass zum Absichern der neuen Brückensegmente gegen radial nach aussen wirkende Kräfte ein Formschluss zwischen dem Wärmestausegmentträger und den neuen Brückensegmenten vorgesehen ist, und dass zur Herstellung des Formschlusses in der Kühlluftnut seitlich in axialer Richtung nutartige Vertiefungen vorgesehen sind, in welche die Brückensegmente mit in axialer Richtung ausgestellten Befestigungsfüssen eingreifen.An embodiment of the rotor according to the invention is characterized in that the bridge segments are additionally secured against radially outwardly acting forces, that for securing the new bridge segments against radially outward acting forces a positive connection between the heat spine carrier and the new bridge segments is provided, and that for the production the positive connection in the cooling air groove are provided laterally in the axial direction groove-like recesses, in which engage the bridge segments with issued in the axial direction mounting feet.
Die nutartigen Vertiefungen können jeweils als Ringnuten ausgebildet sein, die konzentrisch zu einer axialen Drehachse verlaufen, wobei die Befestigungsfüsse der Brückensegmente eine entsprechende Ringform aufweisen.The groove-like recesses may each be formed as annular grooves which extend concentrically to an axial axis of rotation, wherein the mounting feet of the bridge segments have a corresponding annular shape.
Sie können aber auch als Ringnuten ausgebildet sein, die konzentrisch zu einer radialen Drehachse verlaufen, wobei die Befestigungsfüsse der Brückensegmente eine entsprechende Ringform aufweisen. In diesem Fall sind die aneinanderstossenden Anschlusswände der Brückensegmente und des Wärmestausegmentträgers vorzugsweise als konzentrisch zur Drehachse orientierte Zylinderflächen ausgebildet.But they can also be designed as annular grooves which extend concentrically to a radial axis of rotation, wherein the mounting feet of the bridge segments have a corresponding annular shape. In this case, the abutting connecting walls of the bridge segments and the heat spine carrier are preferably designed as cylindrical surfaces oriented concentrically to the axis of rotation.
Die Erfindung soll nachfolgend anhand von Ausführungsbeispielen im Zusammenhang mit der Zeichnung näher erläutert werden. Es zeigen
- Fig. 1
- eine Figur aus der eingangs genannten Druckschrift, in welcher die Lage und beispielhafte Form einer noch nicht ausgedrehten Kühlluftnut an einem Gasturbinen-Rotor wiedergegeben ist;
- Fig. 2
- den Längsschnitt durch einen Wärmestausegmentträger gemäss
Fig. 1 mit ausgedrehter und wieder zugeschweisster Kühlluftnut; - Fig. 3
- in einer perspektivischen Darstellung den Ausschnitt aus einem Rotor mit nachgearbeiteter Kühlluftnut und eindreh- und einklemmbarem Brückensegment gemäss einem ersten Ausführungsbeispiel der Erfindung;
- Fig. 4
- in einer zu
Fig. 3 vergleichbaren Darstellung das Eindrehen eines der Brückensegmente um eine axiale Drehachse beim Ausführungsbeispiel gemässFig. 3 ; - Fig. 5
- in einer zu
Fig. 3 und4 vergleichbaren Darstellung das Ausführungsbeispiel ausFig. 3 mit drei bereits eingedrehten und eingeklemmten Brückensegmenten; und - Fig. 6
- in einer perspektivischen Darstellung den Ausschnitt aus einem Rotor mit nachgearbeiteter Kühlluftnut und eindreh- und einklemmbarem Brückensegment gemäss einem zweiten Ausführungsbeispiel der Erfindung mit um eine radiale Drehachse eindreh- und einklemmbaren Brückensegmenten.
- Fig. 1
- a figure from the aforementioned document, in which the position and exemplary shape of a not yet turned Kühlluftnut is reproduced on a gas turbine rotor;
- Fig. 2
- the longitudinal section through a heat spreader carrier according
Fig. 1 with turned and re-sealed Kühlluftnut; - Fig. 3
- in a perspective view of the section of a rotor with reworked Kühlluftnut and einrehemmbaren and einklemmbarem bridge segment according to a first embodiment of the invention;
- Fig. 4
- in one too
Fig. 3 comparable representation of the screwing one of the bridge segments about an axial axis of rotation in the embodiment according toFig. 3 ; - Fig. 5
- in one too
Fig. 3 and4 comparable representation of the embodimentFig. 3 with three already screwed and clamped bridge segments; and - Fig. 6
- in a perspective view of the section of a rotor with reworked Kühlluftnut and einrehemmbaren and einklemmbarem bridge segment according to a second embodiment of the invention with a radial axis of rotation einreh- and clamped bridge segments.
Der Grundgedanke der vorliegenden Erfindung besteht darin, den reparaturbedingten Einbau von Wärmestausegmentbrücken dadurch zu vereinfachen, das die Brückensegmente im GT-Rotor verklemmt werden.The basic idea of the present invention is to simplify the repair-related installation of heat spine bridges by jamming the bridge segments in the GT rotor.
Generell gibt es die folgenden prinzipiellen Möglichkeiten A, B und C zur Nacharbeit der betreffenden Sektion, wobei die Variante A das Verfahren gemäss der Erfindung beschreibt, und die Varianten B und C bereits bekannte, standardisierte Nacharbeiten beschreiben:
- (A) Halboffen: Die Brückensegmente werden eingeklemmt. Sie können Kompressionskräfte (Druck) übertragen, Zugkräfte jedoch nicht; eine Abdichtung des Kühlluftstroms ist gewährleistet.
- (B) Geschlossen: Die Brückensegmente werden eingeschweisst. Sie können Kompressionskräfte und Zugkräfte übertragen; eine Abdichtung des Kühlluftstroms ist gewährleistet (Standard-Schweissreparatur für langlebige Nacharbeit).
- (C) Offen: Die Kühlluftnut bleibt oben offen. Es können weder Kompressionskräfte noch Zugkräfte übertragen werden (Standard-On-Site-Reparatur für kleine Nacharbeit).
- (A) Semi-open: The bridge segments are pinched. You can transfer compressive forces (pressure), but not tensile forces; a seal of the cooling air flow is ensured.
- (B) Closed: The bridge segments are welded in. You can transfer compressive forces and tensile forces; a seal of Cooling air flow is guaranteed (standard welding repair for durable reworking).
- (C) Open: The cooling air groove remains open at the top. Neither compressive forces nor tensile forces can be transmitted (standard on-site repair for minor rework).
Gemäss der Variante A werden Brückensegmente dort klemmend eingesetzt, wo vor dem Ausdrehen der Kühlluftnut eine geschweisste Brückenverbindung vorhanden war. Dies kann auf unterschiedliche Arten und Weisen durchgeführt werden.According to variant A, bridge segments are used there by clamping, where a welded bridge connection was present before the cooling air groove was removed. This can be done in different ways.
In
Neben der klemmenden Halterung der neuen Brückensegmente 20 in den Lücken der Abschnitte 28 werden die neuen Brückensegmente 20 zusätzlich gegen radial nach aussen wirkende Kräfte gesichert. Zum Absichern der neuen Brückensegmente 20 gegen radial nach aussen wirkende Kräfte wird konstruktiv ein Formschluss zwischen dem Wärmestausegmentträger 14 und den neuen Brückensegmenten 20 hergestellt. Im Ausführungsbeispiel der
Es ist aber auch eine andere Art des Formschlusses zwischen Brückensegment und Wärmestausegmentträger möglich, die in
Insgesamt werden mit der Erfindung verschweisste Gasturbinen-Rotoren ermöglicht, bei denen Brückensegmente mit dem Ziel, die Steifigkeit und damit die zyklische Lebensdauer des Rotors zu verbessern, ohne eine Schweissverbindung eingebaut werden können. Hierdurch wird auf vereinfachte Weise eine Optimierung der Lastverteilung in lebensdauerbestimmenden Bereichen an eingedrehten Nuten sowie eine Abdichtung gegen Kühlluftleckagen erreicht.Overall, the invention allows welded gas turbine rotors, in which bridge segments with the aim of improving the rigidity and thus the cyclic life of the rotor, without a welded joint can be installed. As a result, an optimization of the load distribution in life-time-determined areas on turned grooves and a seal against cooling air leakage is achieved in a simplified manner.
Dabei hat sich herausgestellt, dass mit der Variante A der Nacharbeit eine nur leicht niedrigere zyklische Lebensdauer gegenüber der geschweissten Variante B, jedoch eine deutlich verbesserte zyklische Lebensdauer gegenüber der brückenlosen Variante C erreicht werden kann.It has been found that with the variant A reworking only a slightly lower cyclic life compared to the welded variant B, but a significantly improved cyclic life compared to the bridgeless variant C can be achieved.
Die beim Anfahren wirkenden hohen Druckkräfte im Nutgrund werden zum Teil über die (klemmend gehaltene) Brückenstütze umverteilt. Dies wirkt sich entlastend auf den Nutgrund aus.The high pressure forces acting in the groove bottom during start-up are partially redistributed via the (clamped) bridge support. This has a relieving effect on the groove bottom.
Zugkräfte, die beim Entlasten/Stop entstehen, fallen quantitativ wesentlich niedriger aus und haben somit geringere Bedeutung für die Lebensdauer, als Starts.Tensile forces that arise during unloading / stopping are quantitatively much lower and therefore have less importance for the service life than starts.
Als weiterer Punkt sei erwähnt, dass durch die Stützwirkung einer Brückenkonstruktion die Biegesteifigkeit verbessert wird. Das Risiko auf hochzyklische Anregung wird dementsprechend verringert.As a further point, it should be mentioned that the flexural rigidity is improved by the supporting effect of a bridge construction. The risk of highly cyclic excitation is reduced accordingly.
- 1010
- Rotor (Gasturbine)Rotor (gas turbine)
- 1111
- Achseaxis
- 1212
- Verdichterteilcompressor part
- 1313
- Turbinenteilturbine part
- 1414
- WärmestausegmentträgerHeat shield segment carrier
- 1515
- WärmestausegmentaufnahmeHeat shield segment recording
- 16,16'16.16 '
- KühlluftnutKühlluftnut
- 16a16a
- Nutgrundgroove base
- 1717
- Bohrungdrilling
- 1818
- LaufschaufelaufnahmeBlade receptacle
- 1919
- WärmestausegmentbrückeHeat shield segment bridge
- 20,20'20.20 '
- Brückensegmentbridge segment
- 21,2221.22
- Befestigungsfussmounting foot
- 21',22'21 ', 22'
- Befestigungsfussmounting foot
- 23,2423.24
- Ringnutring groove
- 23',24'23 ', 24'
- Ringnutring groove
- 25,2625.26
- Anschlusswandconnecting wall
- 2727
- Drehachseaxis of rotation
- 2828
- Abschnitt (Wärmestausegmentträger)Section (heat spine carrier)
Claims (14)
- Method for repairing the rotor (10) of a gas turbine which has in the axial direction in front of and/or behind the moving blades a heat shield segment carrier (14) which runs peripherally concentrically with respect to the axis (11) of the rotor (10) and below which runs concentrically with respect to the axis (11) an internal closed cooling-air groove (16) which is spanned, between the heat shield segment receptacles (15) arranged so as to be distributed over the circumference and running in the axial direction, in each case by a welded heat shield segment bridge (19), in which method, first, the heat shield segment bridges (19) are separated out, then damaged regions, in particular in the groove bottom (16a) of the cooling-air groove (16), are removed by means of machining of the cooling-air groove (16), and, subsequently, the machined cooling-air groove (16') is closed again between the heat shield segment receptacles (15) in each case by means of the insertion of a new bridge segment (20, 20'), characterized in that the new bridge segments (20, 20') are merely clamped in the heat shield segment carrier (14).
- Method according to Claim 1, characterized in that the new bridge segments (20, 20') are additionally secured against forces acting radially outwards.
- Method according to Claim 2, characterized in that, to safeguard the new bridge segments (20, 20') against forces acting radially outwards, a positive connection is made between the heat shield segment carrier (14) and the new bridge segments (20, 20').
- Method according to Claim 3, characterized in that, to make the positive connection, the machined cooling-air groove (16') has introduced into it laterally in the axial direction groove-like depressions (23, 24; 23', 24') into which the new bridge segments (20, 20') engage by means of fastening feet (21, 22; 21', 22') set out in the axial direction.
- Method according to Claim 4, characterized in that the groove-like depressions are designed in each case as annular grooves (23, 24) which run concentrically with respect to an axial axis of rotation, in that the fastening feet (21, 22) of the new bridge segments (20) have a corresponding annular shape, and in that, when the new bridge segments (20) are being assembled, the new bridge segments (20) are screwed into the annular grooves (23, 24) about the axis of rotation by means of the fastening feet (21, 22).
- Method according to Claim 4, characterized in that the groove-like depressions are designed in each case as annular grooves (23', 24') which run concentrically with respect to a radial axis of rotation (27), in that the fastening feet (21', 22') of the bridge segments (20') have a corresponding annular shape, and in that, when the new bridge segments (20') are being assembled, the new bridge segments (20') are screwed into the annular grooves (23', 24') about the axis of rotation (27) by means of the fastening feet (21', 22').
- Method according to Claim 6, characterized in that the mutually abutting connecting walls (25, 26) of the new bridge segments (20') and of the heat shield segment carrier (14) are designed as cylinder surfaces oriented concentrically with respect to the axis of rotation (27).
- Rotor (10) for a gas turbine, which rotor (10) has in the axial direction in front of and/or behind the moving blades a heat shield segment carrier (14) which runs peripherally concentrically with respect to the axis (11) of the rotor (10) and below which runs concentrically with respect to the axis (11) an internal closed cooling-air groove (16') which is spanned, between the heat shield segment receptacles (15) arranged so as to be distributed over the circumference and running in the axial direction, in each case by a bridge segment (20, 20'), characterized in that the bridge segments (20, 20') are merely clamped in the heat shield segment carrier (14).
- Rotor according to Claim 8, characterized in that the bridge segments (20, 20') are additionally secured against forces acting radially outwards.
- Rotor according to Claim 9, characterized in that, to safeguard the new bridge segments (20, 20') against forces acting radially outwards, a positive connection is provided between the heat shield segment carrier (14) and the new bridge segments (20, 20').
- Rotor according to Claim 10, characterized in that, to make the positive connection, the cooling-air groove (16') has provided in it laterally in the axial direction groove-like depressions (23, 24; 23', 24') into which the bridge segments (20, 20') engage by means of fastening feet (21, 22; 21', 22') set out in the axial direction.
- Rotor according to Claim 11, characterized in that the groove-like depressions are designed in each case as annular grooves (23, 24) which run concentrically with respect to an axial axis of rotation, and in that the fastening feet (21, 22) of the bridge segments (20) have a corresponding annular shape.
- Rotor according to Claim 11, characterized in that the groove-like depressions are designed in each case as annular grooves (23', 24') which run concentrically with respect to a radial axis of rotation (27), and in that the fastening feet (21', 22') of the bridge segments (20') have a corresponding annular shape.
- Rotor according to Claim 13, characterized in that the mutually abutting connecting walls (25, 26) of the bridge segments (20') and of the heat shield segment carrier (14) are designed as cylinder surfaces oriented concentrically with respect to the axis of rotation (27).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH8872006 | 2006-06-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1862638A1 EP1862638A1 (en) | 2007-12-05 |
EP1862638B1 true EP1862638B1 (en) | 2009-07-01 |
Family
ID=36940226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07107597A Not-in-force EP1862638B1 (en) | 2006-06-01 | 2007-05-07 | Method for repairing the rotor of a gas turbine and rotor of a gas turbine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1862638B1 (en) |
AT (1) | ATE435358T1 (en) |
DE (1) | DE502007000968D1 (en) |
DK (1) | DK1862638T3 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH699996A1 (en) | 2008-11-19 | 2010-05-31 | Alstom Technology Ltd | Method for processing of a gas turbine runner. |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1143040A (en) * | 1954-09-10 | 1957-09-25 | Henschel & Sohn Gmbh | Cooled turbine rotor for high gas temperatures |
EP1018594B1 (en) * | 1999-01-06 | 2006-12-27 | General Electric Company | Wheelspace windage cover plate for a turbine |
-
2007
- 2007-05-07 DK DK07107597T patent/DK1862638T3/en active
- 2007-05-07 EP EP07107597A patent/EP1862638B1/en not_active Not-in-force
- 2007-05-07 AT AT07107597T patent/ATE435358T1/en active
- 2007-05-07 DE DE502007000968T patent/DE502007000968D1/en active Active
Also Published As
Publication number | Publication date |
---|---|
DK1862638T3 (en) | 2009-08-24 |
DE502007000968D1 (en) | 2009-08-13 |
EP1862638A1 (en) | 2007-12-05 |
ATE435358T1 (en) | 2009-07-15 |
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