EP2143884A1 - Rotor disc for a turbomachine - Google Patents

Rotor disc for a turbomachine Download PDF

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Publication number
EP2143884A1
EP2143884A1 EP08012624A EP08012624A EP2143884A1 EP 2143884 A1 EP2143884 A1 EP 2143884A1 EP 08012624 A EP08012624 A EP 08012624A EP 08012624 A EP08012624 A EP 08012624A EP 2143884 A1 EP2143884 A1 EP 2143884A1
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EP
European Patent Office
Prior art keywords
wheel disc
front side
wheel
barrier coating
thermal barrier
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.)
Withdrawn
Application number
EP08012624A
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German (de)
French (fr)
Inventor
Yevgen Dr. Kostenko
Traugott Paul
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Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP08012624A priority Critical patent/EP2143884A1/en
Publication of EP2143884A1 publication Critical patent/EP2143884A1/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12Blades
    • F01D5/28Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/288Protective coatings for blades
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/007Preventing corrosion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02Blade-carrying members, e.g. rotors
    • F01D5/08Heating, heat-insulating or cooling means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00Manufacture
    • F05D2230/90Coating; Surface treatment
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00Materials; Properties thereof
    • F05D2300/20Oxide or non-oxide ceramics
    • F05D2300/21Oxide ceramics
    • F05D2300/2118Zirconium oxides

Definitions

  • the invention relates to a wheel disc for a turbomachine, wherein the wheel disc is designed for shrinking on a shaft, wherein the wheel disc has a front side and a rear side.
  • a turbomachine is, for example, a steam turbine, in particular a low-pressure steam turbine.
  • a low-pressure steam turbine essentially has a rotor with rotor blades arranged on this rotor and an inner housing arranged around the rotor. The inner housing has vanes that protrude between the blades.
  • rotors for low-pressure steam turbines which are made of a first cylindrical rotor material, wherein wheel disks are shrunk onto this rotor material. These wheel discs have an inner diameter which is slightly smaller than the outer diameter of the first rotor material. In a method step, the wheel disc is heated, so that the inner diameter is slightly larger than the diameter of the first rotor material by the thermal expansion.
  • the wheel disc is pulled onto the first rotor material and then cooled uniformly, so that the wheel disc is shrunk onto the first rotor material.
  • On such a wheel disc several blades are arranged.
  • the surface of the wheel disc and the surface of the inner housing arranged opposite the wheel disc form a flow channel through which a low-pressure steam flows during operation.
  • Low-pressure steam turbines are known, which are designed in such a way that the incoming steam flows in the flow channel and is also located in the spaces between the individual wheel disks and in front of the first wheel disk. Such flow conditions of the steam can cause the steam to be wet before the first wheel disk opposite to the steam, which is located after the wheel disc, which is usually overheated.
  • a known problem with such wheel disks is therefore the significant temperature transition between the superheated and wet areas of the first wheel disk.
  • This comparatively high temperature gradient may, in connection with the shrinking of the wheel disc to a first rotor material to an undesirable stress corrosion cracking in the region of the contact surface between the wheel disc and the first rotor material. This can cause cracks in this area, which leads to a reduction in lifespan.
  • the invention begins, whose task is to further develop the wheel disc such that stress corrosion cracking is reduced.
  • a wheel disc for a turbomachine wherein the wheel disc is designed for shrinking onto a shaft, wherein the wheel disc has a front side and a rear side, wherein a thermal barrier coating is arranged on the front side.
  • the invention thus paves the way to reduce the heat transfer of the steam to the front of the wheel disc, thereby reducing the integral temperature in the wheel disc.
  • the thermal barrier coating which is now used in an unusual manner in a low-pressure steam turbine on a wheel disc, is effectively avoided that the temperature of the steam leads to an undesirable increase in the temperature in the wheel disc.
  • the shrinkage can be withdrawn at the same time, since here too the low temperature is the design criterion for shrinkage design. Due to the lower temperature gradient in the wheel disc thereby the risk of cracking due to stress corrosion cracking is effectively reduced.
  • the front side of the wheel disc has a concave curvature.
  • a concave curvature of the front surface leads to a material savings of the wheel disc at the same time high demands on the strength of the wheel disc, which means that the wheel disc still has sufficient strength to accommodate the turbine blades.
  • the rear side of the wheel disc is also concave.
  • the wheel disc as a whole has less material, which leads to a lower centrifugal force.
  • the thermal barrier coating is constructed of the zirconia material.
  • the thermal barrier coating can be applied to the wheel disc via an adhesive layer.
  • Examples of a thermal barrier coating or an adhesive layer and further layers are in the WO 2006/133980 A1 disclosed. The content of WO 2006/133980 A1 is thus fully included in the disclosure of this application.
  • FIG. 1 shows a sectional view through part of a low-pressure steam turbine 1.
  • a first rotor material 3 is rotatably mounted about a rotation axis 2. Radulationn 4a, 4b, 4c and 4d are applied to the first rotor material 3.
  • the wheel disk 4a is in this case the first wheel disk seen in a flow direction 5.
  • steam flows via a vapor inflow region, not illustrated in the flow direction 5, into a flow channel 6.
  • the flow channel 6 is arranged essentially between the wheel discs 4a, 4b, 4c, 4d and a guide blade carrier 7.
  • the guide blade carrier 7 comprises a plurality of stator blades 8.
  • rotor blades 9 arranged on the wheel disks 4a, 4b, 4c, 4d are arranged in the flow channel 6.
  • the steam flowing in such a low-pressure steam turbine 1 has a temperature of less than 120 ° C and is relatively wet.
  • a thermal barrier coating 13 is applied on the front 10 of the first wheel 4a.
  • the thermal barrier coating 13 may be applied to the front 10 by known methods.
  • zirconia can be used as the material for the thermal barrier coating 13.
  • a non-illustrated adhesive layer can be applied, which provides a good connection between the thermal barrier coating 13 and the front 10 causes.
  • Examples of a thermal barrier coating 13 or an adhesive layer and further layers are known from the WO 2006/133980 A1 disclosed. The content of WO 2006/133980 A1 is thus fully included in the disclosure of this application.
  • the now lower temperature gradient 12 as a result of applying the thermal barrier coating 13 leads to an improved connection between the wheel disc 4a and the first rotor material 3 at the fitting point 14. At the fitting point 14, the risk of stress corrosion cracking is now reduced since the temperature gradient 12 is lower.
  • the wheel disc 4a is, as seen in cross-section, formed such that the front side 10 shows a concave curvature.
  • the rear side 11 is also concave. This leads to a weight reduction of the wheel disc as a whole, which leads to a reduction of the centrifugal forces during operation.
  • the thermal barrier coating 13 is applied to the concave curvature.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The rotor disk (4a) has a front side (10) and a back side (11), where the rotor disk is formed for shrink-coating on a shaft. A heat-insulating layer (13) is arranged on the front side. Grooves are provided for accomodating guide blades (9) of a low pressure steam turbine (1). The front and back sides have concave curvatures, and the heat-insulating layer comprises zirconium oxide. An adhesive layer is attached on the front side before attachment of the insulating layer on the front side, so that a connection between the insulating layer and the front side is produced.

Description

Die Erfindung betrifft eine Radscheibe für eine Strömungsmaschine, wobei die Radscheibe zum Aufschrumpfen auf einer Welle ausgebildet ist, wobei die Radscheibe eine Vorderseite und eine Hinterseite aufweist.The invention relates to a wheel disc for a turbomachine, wherein the wheel disc is designed for shrinking on a shaft, wherein the wheel disc has a front side and a rear side.

Eine Strömungsmaschine ist beispielsweise eine Dampfturbine, insbesondere eine Niederdruck-Dampfturbine. Eine Niederdruck-Dampfturbine weist im Wesentlichen einen Rotor mit auf diesem Rotor angeordneten Laufschaufeln und einem um den Rotor angeordneten Innengehäuse auf. Das Innengehäuse weist Leitschaufeln auf, die zwischen die Laufschaufeln ragen. Es sind Rotoren für Niederdruck-Dampfturbinen bekannt, die aus einem ersten zylindrischen Rotormaterial gefertigt sind, wobei Radscheiben auf dieses Rotormaterial aufgeschrumpft werden. Diese Radscheiben weisen einen Innendurchmesser auf, der geringfügig kleiner ist als der Außendurchmesser des ersten Rotormaterials. In einem Verfahrensschritt wird die Radscheibe erwärmt, so dass durch die thermische Ausdehnung der Innendurchmesser geringfügig größer wird als der Durchmesser des ersten Rotormaterials. In einem weiteren Verfahrensschritt wird die Radscheibe auf das erste Rotormaterial gezogen und anschließend gleichmäßig abgekühlt, so dass die Radscheibe auf das erste Rotormaterial aufgeschrumpft wird. Auf solch eine Radscheibe werden mehrere Laufschaufeln angeordnet. Die Oberfläche der Radscheibe und die Oberfläche des gegenüber der Radscheibe angeordneten Innengehäuses bilden einen Strömungskanal, durch den im Betrieb ein Niederdruckdampf strömt. Es sind Niederdruck-Dampfturbinen bekannt, die derart ausgebildet werden, dass der einströmende Dampf im Strömungskanal strömt, und auch in den Räumen zwischen den einzelnen Radscheiben und vor der ersten Radscheibe sich befindet. Solche Strömungsverhältnisse des Dampfes können dazu führen, dass vor der ersten Radscheibe der Dampf nass ist gegenüber dem Dampf, der nach der Radscheibe sich befindet, der in der Regel überhitzt ist.A turbomachine is, for example, a steam turbine, in particular a low-pressure steam turbine. A low-pressure steam turbine essentially has a rotor with rotor blades arranged on this rotor and an inner housing arranged around the rotor. The inner housing has vanes that protrude between the blades. There are known rotors for low-pressure steam turbines, which are made of a first cylindrical rotor material, wherein wheel disks are shrunk onto this rotor material. These wheel discs have an inner diameter which is slightly smaller than the outer diameter of the first rotor material. In a method step, the wheel disc is heated, so that the inner diameter is slightly larger than the diameter of the first rotor material by the thermal expansion. In a further method step, the wheel disc is pulled onto the first rotor material and then cooled uniformly, so that the wheel disc is shrunk onto the first rotor material. On such a wheel disc several blades are arranged. The surface of the wheel disc and the surface of the inner housing arranged opposite the wheel disc form a flow channel through which a low-pressure steam flows during operation. Low-pressure steam turbines are known, which are designed in such a way that the incoming steam flows in the flow channel and is also located in the spaces between the individual wheel disks and in front of the first wheel disk. Such flow conditions of the steam can cause the steam to be wet before the first wheel disk opposite to the steam, which is located after the wheel disc, which is usually overheated.

Ein bekanntes Problem bei solchen Radscheiben ist daher der signifikante Temperaturübergang zwischen dem überhitzten und dem nassen Bereich der ersten Radscheibe. Dieser vergleichsweise hohe Temperaturgradient kann im Zusammenhang mit dem Aufschrumpfen der Radscheibe auf ein erstes Rotormaterial zu einer unerwünschten Spannungsrisskorrosion im Bereich der Berührungsfläche zwischen der Radscheibe und dem ersten Rotormaterial führen. Dadurch können in diesem Bereich Anrisse entstehen, die zu einer Lebensdauerreduzierung führen.A known problem with such wheel disks is therefore the significant temperature transition between the superheated and wet areas of the first wheel disk. This comparatively high temperature gradient may, in connection with the shrinking of the wheel disc to a first rotor material to an undesirable stress corrosion cracking in the region of the contact surface between the wheel disc and the first rotor material. This can cause cracks in this area, which leads to a reduction in lifespan.

Wünschenswert wäre es hier, die Radscheibe derart weiterzubilden, dass die Gefahr von Anrissen verringert ist.It would be desirable here to further develop the wheel disc so that the risk of cracks is reduced.

An dieser Stelle setzt die Erfindung an, deren Aufgabe es ist, die Radscheibe derart weiterzubilden, dass eine Spannungsrisskorrosion verringert wird.At this point, the invention begins, whose task is to further develop the wheel disc such that stress corrosion cracking is reduced.

Gelöst wird diese Aufgabe durch eine Radscheibe für eine Strömungsmaschine, wobei die Radscheibe zum Aufschrumpfen auf eine Welle ausgebildet ist, wobei die Radscheibe eine Vorderseite und eine Hinterseite aufweist, wobei eine Wärmedämmschicht auf der Vorderseite angeordnet ist.This object is achieved by a wheel disc for a turbomachine, wherein the wheel disc is designed for shrinking onto a shaft, wherein the wheel disc has a front side and a rear side, wherein a thermal barrier coating is arranged on the front side.

Mit der Erfindung wird somit der Weg eingeschlagen, den Wärmeübergang des Dampfes auf die Vorderseite der Radscheibe zu reduzieren, um dadurch die integrale Temperatur in der Radscheibe zu reduzieren. Mit der Wärmedämmschicht, die nunmehr in unüblicher Weise in einer Niederdruckdampfturbine auf einer Radscheibe verwendet wird, wird wirksam vermieden, dass die Temperatur des Dampfes zu einer nicht erwünschten Erhöhung der Temperatur in der Radscheibe führt. Neben der dadurch vermiedenen Erhöhung der Temperatur in der Radscheibe kann gleichzeitig der Schrumpf zurückgenommen werden, da auch hier die niedrige Temperatur das Auslegungskriterium für Schrumpfauslegung ist. Durch den niedrigeren Temperaturgradienten in der Radscheibe ist dadurch die Gefahr der Rissbildung in Folge von Spannungsrisskorrosion wirksam reduziert.The invention thus paves the way to reduce the heat transfer of the steam to the front of the wheel disc, thereby reducing the integral temperature in the wheel disc. With the thermal barrier coating, which is now used in an unusual manner in a low-pressure steam turbine on a wheel disc, is effectively avoided that the temperature of the steam leads to an undesirable increase in the temperature in the wheel disc. In addition to the thereby avoided increase in the temperature in the wheel disc, the shrinkage can be withdrawn at the same time, since here too the low temperature is the design criterion for shrinkage design. Due to the lower temperature gradient in the wheel disc thereby the risk of cracking due to stress corrosion cracking is effectively reduced.

Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.Advantageous developments are specified in the subclaims.

Vorteilhafterweise weist die Vorderseite der Radscheibe eine konkave Wölbung auf. Eine konkave Wölbung der Vorderseite führt zu einer Materialersparnis der Radscheibe bei gleichzeitig hoher Anforderung an die Festigkeit der Radscheibe, was dazu führt, dass die Radscheibe nach wie vor genügend Festigkeit zur Aufnahme der Turbinenlaufschaufeln aufweist.Advantageously, the front side of the wheel disc has a concave curvature. A concave curvature of the front surface leads to a material savings of the wheel disc at the same time high demands on the strength of the wheel disc, which means that the wheel disc still has sufficient strength to accommodate the turbine blades.

In einer weiteren vorteilhaften Weiterbildung ist die Hinterseite der Radscheibe ebenfalls konkav gewölbt. Die Radscheibe weist dadurch insgesamt weniger Material auf, das zu einer geringeren Zentrifugalkraft führt.In a further advantageous embodiment, the rear side of the wheel disc is also concave. As a result, the wheel disc as a whole has less material, which leads to a lower centrifugal force.

Vorteilhafterweise ist die Wärmedämmschicht aus dem Material Zirkondioxid aufgebaut. Die Wärmedämmschicht kann über eine Haftschicht an die Radscheibe aufgebracht werden. Beispiele für eine Wärmedämmschicht bzw. einer Haftschicht und weiteren Schichten sind in der WO 2006/133980 A1 offenbart. Der Inhalt der WO 2006/133980 A1 wird somit vollumfänglich mit in den Offenbarungsgehalt dieser Anmeldung aufgenommen.Advantageously, the thermal barrier coating is constructed of the zirconia material. The thermal barrier coating can be applied to the wheel disc via an adhesive layer. Examples of a thermal barrier coating or an adhesive layer and further layers are in the WO 2006/133980 A1 disclosed. The content of WO 2006/133980 A1 is thus fully included in the disclosure of this application.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung beschrieben. Diese soll das Ausführungsbeispiel nicht maßstäblich darstellen, vielmehr ist die Zeichnung, wozu Erläuterungen dienen, in schematischer und/oder leicht versetzter Form ausgeführt. Im Hinblick auf Ergänzungen der aus der Zeichnung unmittelbar erkennbaren Lehren wird auf den einschlägigen Stand der Technik verwiesen.Embodiments of the invention are described below with reference to the drawing. This is not intended to represent the embodiment to scale, but the drawing, to which explanations serve, executed in a schematic and / or slightly offset form. With regard to additions to the teachings directly recognizable from the drawing reference is made to the relevant prior art.

Es zeigt:

Figur 1
eine Schnittansicht durch einen Teil einer Nieder-druck-Dampfturbine.
It shows:
FIG. 1
a sectional view through part of a low-pressure steam turbine.

Komponenten mit ähnlicher Wirkungsweise weisen dieselben Bezugszeichen auf.Components with similar operation have the same reference numerals.

Die Figur 1 zeigte eine Schnittansicht durch einen Teil einer Niederdruck-Dampfturbine 1. Um eine Rotationsachse 2 ist ein erstes Rotormaterial 3 drehbar gelagert. Um das erste Rotormaterial 3 werden Radscheiben 4a, 4b, 4c und 4d aufgebracht. Die Radscheibe 4a ist hierbei die erste Radscheibe in einer Strömungsrichtung 5 gesehen. Im Betrieb strömt Dampf über einen nicht näher dargestellten Dampfeinströmbereich in Strömungsrichtung 5 in einen Strömungskanal 6. Der Strömungskanal 6 ist im Wesentlichen zwischen den Radscheiben 4a, 4b, 4c, 4d und einem Leitschaufelträger 7 angeordnet. Der Leitschaufelträger 7 umfasst mehrere Leitschaufeln 8. Des Weiteren sind im Strömungskanal 6 auf den Radscheiben 4a, 4b, 4c, 4d angeordnete Laufschaufeln 9.FIG. 1 shows a sectional view through part of a low-pressure steam turbine 1. A first rotor material 3 is rotatably mounted about a rotation axis 2. Radscheiben 4a, 4b, 4c and 4d are applied to the first rotor material 3. The wheel disk 4a is in this case the first wheel disk seen in a flow direction 5. In operation, steam flows via a vapor inflow region, not illustrated in the flow direction 5, into a flow channel 6. The flow channel 6 is arranged essentially between the wheel discs 4a, 4b, 4c, 4d and a guide blade carrier 7. The guide blade carrier 7 comprises a plurality of stator blades 8. Furthermore, rotor blades 9 arranged on the wheel disks 4a, 4b, 4c, 4d are arranged in the flow channel 6.

Der in solch einer Niederdruck-Dampfturbine 1 strömende Dampf weist eine Temperatur von weniger als 120°C auf und ist vergleichsweise nass.The steam flowing in such a low-pressure steam turbine 1 has a temperature of less than 120 ° C and is relatively wet.

Im Betrieb solch einer Niederdruck-Dampfturbine 1 kann es vorkommen, dass der auf einer Vorderseite 10 der Radscheibe 4a, 4b, 4c, 4d befindliche Dampf eine vergleichsweise hohe Nässe aufweist. Wohingegen auf der Hinterseite 11 der ersten Radscheibe 4a der Dampf überhitzt ist. Dies führt zu einem Temperaturgradienten 12 innerhalb der Radscheibe 4a.During operation of such a low-pressure steam turbine 1, it may happen that the steam located on a front side 10 of the wheel disk 4a, 4b, 4c, 4d has a comparatively high degree of wetness. Whereas on the rear side 11 of the first wheel disk 4a the steam is overheated. This leads to a temperature gradient 12 within the wheel disc 4a.

Auf die Vorderseite 10 der ersten Radscheibe 4a wird eine Wärmedämmschicht 13 aufgebracht. Die Wärmedämmschicht 13 kann durch bekannte Verfahren auf die Vorderseite 10 aufgebracht werden. Als Material für die Wärmedämmschicht 13 kann beispielsweise Zirkondioxid verwendet werden. Bevor die Wärmedämmschicht auf die Vorderseite 10 aufgebracht wird, kann eine nicht näher dargestellte Haftschicht aufgebracht werden, die eine gute Verbindung zwischen der Wärmedämmschicht 13 und der Vorderseite 10 hervorruft. Beispiele für eine Wärmedämmschicht 13 bzw. einer Haftschicht und weitere Schichten sind aus der WO 2006/133980 A1 offenbart. Der Inhalt der WO 2006/133980 A1 wird somit vollumfänglich mit in den Offenbarungsgehalt dieser Anmeldung aufgenommen.On the front 10 of the first wheel 4a, a thermal barrier coating 13 is applied. The thermal barrier coating 13 may be applied to the front 10 by known methods. For example, zirconia can be used as the material for the thermal barrier coating 13. Before the thermal barrier coating is applied to the front side 10, a non-illustrated adhesive layer can be applied, which provides a good connection between the thermal barrier coating 13 and the front 10 causes. Examples of a thermal barrier coating 13 or an adhesive layer and further layers are known from the WO 2006/133980 A1 disclosed. The content of WO 2006/133980 A1 is thus fully included in the disclosure of this application.

Der nunmehr geringere Temperaturgradient 12 in Folge des Aufbringens der Wärmedämmschicht 13 führt zu einer verbesserten Verbindung zwischen der Radscheibe 4a und des ersten Rotormaterials 3 an der Passstelle 14. An der Passstelle 14 ist die Gefahr einer Spannungsrisskorrosion nun verringert, da der Temperaturgradient 12 geringer ist.The now lower temperature gradient 12 as a result of applying the thermal barrier coating 13 leads to an improved connection between the wheel disc 4a and the first rotor material 3 at the fitting point 14. At the fitting point 14, the risk of stress corrosion cracking is now reduced since the temperature gradient 12 is lower.

Die Radscheibe 4a ist, im Querschnitt gesehen, derart ausgebildet, dass die Vorderseite 10 eine konkave Wölbung zeigt. Die Hinterseite 11 ist ebenfalls konkav ausgebildet. Dies führt zu einer Gewichtsreduzierung der Radscheibe insgesamt, was zu einer Reduzierung der Fliehkräfte im Betrieb führt. Die Wärmedämmschicht 13 wird hierbei auf die konkave Wölbung aufgebracht.The wheel disc 4a is, as seen in cross-section, formed such that the front side 10 shows a concave curvature. The rear side 11 is also concave. This leads to a weight reduction of the wheel disc as a whole, which leads to a reduction of the centrifugal forces during operation. The thermal barrier coating 13 is applied to the concave curvature.

Claims (8)

Radscheibe (4a, 4b, 4c, 4d) für eine Strömungsmaschine,
wobei die Radscheibe (4a, 4b, 4c, 4d) zum Aufschrumpfen auf eine Welle ausgebildet ist,
wobei die Radscheibe (4a, 4b, 4c, 4d) eine Vorderseite (10) und eine Hinterseite (11) aufweist,
dadurch gekennzeichnet, dass
eine Wärmedämmschicht (13) auf der Vorderseite (10) angeordnet ist.
Wheel disc (4a, 4b, 4c, 4d) for a turbomachine,
wherein the wheel disc (4a, 4b, 4c, 4d) is designed to be shrunk onto a shaft,
the wheel disc (4a, 4b, 4c, 4d) having a front side (10) and a rear side (11),
characterized in that
a thermal barrier coating (13) on the front side (10) is arranged.
Radscheibe (4a, 4b, 4c, 4d) nach Anspruch 1,
wobei die Radscheibe (4a, 4b, 4c, 4d) Nuten zum Aufnehmen von Turbinenschaufeln (9) aufweist.
Wheel disc (4a, 4b, 4c, 4d) according to claim 1,
wherein the wheel disc (4a, 4b, 4c, 4d) has grooves for receiving turbine blades (9).
Radscheibe (4a, 4b, 4c, 4d) nach Anspruch 1 oder 2,
wobei im Betrieb die Vorderseite (10),
in einer Strömungsrichtung (5) gesehen,
vor der Hinterseite (11) angeordnet ist.
Wheel disc (4a, 4b, 4c, 4d) according to claim 1 or 2,
wherein in operation the front side (10),
seen in a flow direction (5),
is arranged in front of the rear side (11).
Radscheibe (4a, 4b, 4c, 4d) nach einem der vorhergehenden Ansprüche,
wobei die Radscheibe (4a, 4b, 4c, 4d) zum Aufnehmen von zumindest zwei Turbinenschaufelreihen ausgebildet ist.
Wheel disc (4a, 4b, 4c, 4d) according to one of the preceding claims,
wherein the wheel disc (4a, 4b, 4c, 4d) is adapted to receive at least two rows of turbine blades.
Radscheibe (4a, 4b, 4c, 4d) nach einem der vorhergehenden Ansprüche,
wobei die Radscheibe (4a, 4b, 4c, 4d) zum Einbau in eine Niederdruck-Teilturbine ausgebildet ist.
Wheel disc (4a, 4b, 4c, 4d) according to one of the preceding claims,
wherein the wheel disc (4a, 4b, 4c, 4d) is designed for installation in a low-pressure turbine part.
Radscheibe (4a, 4b, 4c, 4d) nach einem der vorhergehenden Ansprüche,
wobei die Vorderseite (10) eine konkave Wölbung aufweist.
Wheel disc (4a, 4b, 4c, 4d) according to one of the preceding claims,
wherein the front side (10) has a concave curvature.
Radscheibe (4a, 4b, 4c, 4d) nach einem der vorhergehenden Ansprüche,
wobei die Hinterseite (11) eine konkave Wölbung aufweist.
Wheel disc (4a, 4b, 4c, 4d) according to one of the preceding claims,
wherein the rear side (11) has a concave curvature.
Radscheibe nach einem der vorhergehenden Ansprüche,
wobei die Wärmedämmschicht (13) das Material Zirkondioxid umfasst.
Wheel disc according to one of the preceding claims,
wherein the thermal barrier coating (13) comprises the zirconia material.
EP08012624A 2008-07-11 2008-07-11 Rotor disc for a turbomachine Withdrawn EP2143884A1 (en)

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EP08012624A EP2143884A1 (en) 2008-07-11 2008-07-11 Rotor disc for a turbomachine

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Publication number Priority date Publication date Assignee Title
DE102010012583A1 (en) 2010-03-23 2011-09-29 Alstom Technology Ltd. Method for operating a steam turbine with a pulse rotor and steam turbine for carrying out the method
US20120195758A1 (en) * 2011-01-31 2012-08-02 Narendra Are Methods and Systems For Controlling Thermal Differential In Turbine Systems
CN106523035A (en) * 2015-09-11 2017-03-22 熵零股份有限公司 Hydraulic shaft gas impeller mechanism, hydraulic shaft gas turbine and device comprising hydraulic shaft gas turbine
US10533421B2 (en) 2014-10-29 2020-01-14 General Electric Technology Gmbh Steam turbine rotor

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GB535566A (en) * 1939-06-13 1941-04-11 Oerlikon Maschf Improvements in or relating to a thermal protective device for rotating heat engines
GB1556274A (en) * 1977-04-19 1979-11-21 Rolls Royce Blade carrying disc for a gas turbine engine
US4279575A (en) * 1977-11-19 1981-07-21 Rolls-Royce Limited Turbine rotor
US20050136249A1 (en) * 2003-12-18 2005-06-23 Hideyuki Arikawa Heat resistant article having thermal barrier coatinging
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EP1710398A1 (en) * 2005-03-31 2006-10-11 General Electric Company Turbine component other than airfoil having ceramic corrosion resistant coating and methods for making same
WO2006133980A1 (en) 2005-06-13 2006-12-21 Siemens Aktiengesellschaft Layer system for a component comprising a thermally insulating layer and a metallic anti-erosion layer, method for the production and method for the operation of a steam turbine
EP1808576A1 (en) * 2006-01-11 2007-07-18 Siemens Aktiengesellschaft Turbine shaft for a flow machine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB535566A (en) * 1939-06-13 1941-04-11 Oerlikon Maschf Improvements in or relating to a thermal protective device for rotating heat engines
GB1556274A (en) * 1977-04-19 1979-11-21 Rolls Royce Blade carrying disc for a gas turbine engine
US4279575A (en) * 1977-11-19 1981-07-21 Rolls-Royce Limited Turbine rotor
US20050136249A1 (en) * 2003-12-18 2005-06-23 Hideyuki Arikawa Heat resistant article having thermal barrier coatinging
EP1710398A1 (en) * 2005-03-31 2006-10-11 General Electric Company Turbine component other than airfoil having ceramic corrosion resistant coating and methods for making same
WO2006133980A1 (en) 2005-06-13 2006-12-21 Siemens Aktiengesellschaft Layer system for a component comprising a thermally insulating layer and a metallic anti-erosion layer, method for the production and method for the operation of a steam turbine
DE202005019320U1 (en) * 2005-12-08 2006-02-09 Abb Turbo Systems Ag Exhaust gas turbine for superchargers of internal combustion engines has thermal protection layer covering turbine blades and turbine disk
EP1808576A1 (en) * 2006-01-11 2007-07-18 Siemens Aktiengesellschaft Turbine shaft for a flow machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010012583A1 (en) 2010-03-23 2011-09-29 Alstom Technology Ltd. Method for operating a steam turbine with a pulse rotor and steam turbine for carrying out the method
US20120195758A1 (en) * 2011-01-31 2012-08-02 Narendra Are Methods and Systems For Controlling Thermal Differential In Turbine Systems
US8784061B2 (en) * 2011-01-31 2014-07-22 General Electric Company Methods and systems for controlling thermal differential in turbine systems
US10533421B2 (en) 2014-10-29 2020-01-14 General Electric Technology Gmbh Steam turbine rotor
US11053799B2 (en) 2014-10-29 2021-07-06 General Electric Technology Gmbh Steam turbine rotor
CN106523035A (en) * 2015-09-11 2017-03-22 熵零股份有限公司 Hydraulic shaft gas impeller mechanism, hydraulic shaft gas turbine and device comprising hydraulic shaft gas turbine

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