EP2439376A1 - Shrouded rotor blade for a steam turbine - Google Patents
Shrouded rotor blade for a steam turbine Download PDFInfo
- Publication number
- EP2439376A1 EP2439376A1 EP10186573A EP10186573A EP2439376A1 EP 2439376 A1 EP2439376 A1 EP 2439376A1 EP 10186573 A EP10186573 A EP 10186573A EP 10186573 A EP10186573 A EP 10186573A EP 2439376 A1 EP2439376 A1 EP 2439376A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- shield plate
- steam turbine
- leading edge
- plate
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
- F01D5/225—Blade-to-blade connections, e.g. for damping vibrations by shrouding
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/141—Shape, i.e. outer, aerodynamic form
- F01D5/142—Shape, i.e. outer, aerodynamic form of the blades of successive rotor or stator blade-rows
- F01D5/143—Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
- F01D5/288—Protective coatings for blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
Definitions
- the invention relates to a blade with a cover plate for a steam turbine.
- the blades of a low-pressure turbine final stage are formed in their radial extension and thus must withstand the stresses of high circumferential velocity at the blade tips of the blades and increased heating due to increased fan effects in the final stage.
- the material titanium can be used, which is characterized in addition to a high corrosion resistance by a high strength and a low specific weight.
- a cover band is provided for last run rows.
- the invention has for its object to provide a blade for a steam turbine, in which the above problems are largely overcome and the blade is protected against droplet erosion.
- the rotor blade according to the invention for a steam turbine has an airfoil, which has a blade leading edge and a blade tip, and a cover plate.
- the top plate has a base plate attached to the blade tip of the airfoil and substantially parallel to the engine axis of the steam turbine in the installed state, and a shield plate formed upstream of and protruding radially inward from the blade leading edge to the base plate, so that the Blade tip lies with its portion of the blade leading edge in the lee of the shield plate, when the blade has flowed from a main steam flow of the steam turbine.
- the arranged in the lee of the shield plate region of the blade is thus protected from a caused by the main steam flow drop impact erosion.
- a particularly loaded transition region from the blade tip to the base plate is protected against the drop impact erosion, whereby costly structural measures to reinforce this transitional area need not be made.
- the shield plate is preferably arranged at an axial distance from the vane leading edge of the same, whereby the axial extent of the base plate and thus the axial sealing width of the cover plate are large. A steam leakage occurring during operation of the associated steam turbine on the blade is thereby minimized, whereby the efficiency of the steam turbine is improved.
- the shield plate is preferably formed in its radial extent such that a dead water area forming empty side in the slipstream of the shield plate during operation of the steam turbine extends axially along the entire base plate.
- the dead water area is designed in particular recirculating and the main steam flow has no direct contact with the base plate along the dead water area, so that results in a fluidically effective pitch angle of the cover plate by the radial position of the inner edge of the shield plate.
- the top plate bottom since the top plate bottom does not directly guide the main steam flow, the top plate bottom need not be contacted by the main steam flow accordingly.
- the shield plate is preferably constructed in such a way that the dead water region is continuously maintained during a flow around the rotor blade and it is not possible for a transient vortex shedding to take place from the shield plate. This ensures that the transitional area from the blade tip to the base plate is protected from drop impact erosion during the entire operation of the steam turbine. Further, an occurrence prevented by vortex shedding caused vibrations.
- the blade tip is preferably covered with an erosion-resistant protective material between the shield plate and the base plate, so that the blade tip is protected in the region of the blade leading edge from drop impact erosion.
- the protective material is to glove over the blade areas that it should protect, for example, over areas of the blade tip and / or the base plate and / or the shield plate.
- the protective material can also be replaced during maintenance or inspection work. As a result, it follows that the protective material needs to be formed in its durability only as specified by the scheduled maintenance or inspection intervals. Furthermore, with the shaping of the protective material, the flow around the cover plate can be favorably influenced.
- the blade tip between the shield plate and the base plate is preferably covered with the erosion-resistant protective material in such a way that the shield plate at the radial inner edge can be bypassed free of the main vapor flow. It is further preferred that the blade leading edge is covered with the erosion-resistant protective material, whereby the blade leading edge is protected from drop impact erosion.
- a blade 1 for a steam turbine is shown.
- the rotor blade 1 comprises an airfoil 2, which has a blade leading edge 3 and a blade tip 4, and a cover plate 5.
- the cover plate 5 comprises a shield plate 6 and a base plate 7, with which the cover plate 5 is attached to the blade tip 4.
- the base plate 7 is aligned in the installed state substantially parallel to a machine axis 8 of the steam turbine.
- the shield plate 6 is formed radially inwardly projecting, which is also arranged from the blade leading edge 3 at a distance.
- the cover plate 5 also has a plurality of sealing tips 9 for sealing a gap between the base plate 7 and a steam turbine housing 10.
- blade 1 is subjected to a main steam flow, represented by the arrows 11, which flows around the blade 2 and the cover plate 5.
- Die Schaufelblatt 2 und die Deckplatte 5 Sind über die sowand 5 °.
- a dead water region 13 is formed, which extends axially along the base plate 7.
- the dead water region 13 is arranged at a transition region 14 between the blade tip 4 and the base plate 7.
- the dead water area 13 is formed by a vortex 15, from which the main steam flow is guided.
- the vortex 15 defines the fluidically effective pitch angle 16 of the cover plate 5, which is predetermined by the construction of the shield plate 6. Since the pitch angle 16 depends on the position of the radially inner edge of the shield plate 6 and not on the blade side contour of the base plate 7, the base plate 7 is plate-like and thus lightweight.
- the base plate 7 can therefore be made long in its axial extension without the Blade 1 unacceptably high mechanical load. Due to the large axial extension of the base plate 7 additional sealing tips 9 can be provided on the base plate 7, whereby the sealing efficiency of the cover plate 5 is increased and thus the thermodynamic efficiency of the associated steam turbine is increased.
- Fig. 2 shows the blade 1 according to the invention, which is provided with an erosion-resistant protective material 17.
- the protective material 17 is mounted in the region of the blade tip 4 between the shield plate 6 and the base plate 7 and protects the drop zone erosion particularly vulnerable transition region 14 and parts of the blade leading edge 3.
- the protective material 17 is also formed such that it in the course of maintenance and Inspection work can be easily changed.
- the protective material 17 is attached to the blade leading edge 3, whereby this area is protected against drop impact erosion.
- Fig. 4 shows a further embodiment of the blade 1 with the attached protective material 17. Due to the shape of the protective material 17, the flow around the blade 1 is favorably influenced, whereby the transition region 14 is protected. Furthermore, the protective material 17 is protected from tearing impact by the shield plate 6 at the particularly stressed areas, whereby the intervals for changing the protective material 17 are long.
- Fig. 5 shows a blade 101 for a steam turbine according to the prior art.
- a main steam flow represented by the arrows 102, is guided in the region of a blade tip 103 of the rotor blade 101 by means of a shroud 104.
- the shroud 104 must be contoured accordingly, in order to be able to guide the main steam flow on its blade-side contour 105 and on its side facing the steam turbine housing (not shown) to close the gap by means of sealing tips 106.
- the mass of the shroud 104 is due to this construction so large compared to the mass of the Cover plate 5 according to the invention that the axial extent of the shroud 104 must be kept short. As a result, only a few sealing tips 106 can be provided on the shroud 104. This affects the sealing efficiency of the shroud 104 and thus the thermodynamic efficiency of the steam turbine.
Abstract
Description
Die Erfindung betrifft eine Laufschaufel mit einer Deckplatte für eine Dampfturbine.The invention relates to a blade with a cover plate for a steam turbine.
Moderne Dampfturbinen müssen hohen Ansprüchen bezüglich ihres Wirkungsgrads und ihrer Verfügbarkeit genügen. Um diesen Anforderungen gerecht zu werden, ist es bekannt beispielsweise die Laufschaufeln mit einer Deckplatte bzw. einem Deckband zu versehen, wodurch Spaltverluste in der Dampfturbine verringert werden sollen. An dem Deckband sind mehrere Dichtspitzen ausgebildet, wodurch die Spaltweite zwischen dem Deckband und dem Dampfturbinengehäuse verringert ist. Eine durch den Spalt tretende Spaltströmung kann dadurch minimiert und somit der thermodynamische Wirkungsgrad der Dampfturbine gesteigert werden.Modern steam turbines must meet high standards regarding their efficiency and their availability. To meet these requirements, it is known, for example, to provide the rotor blades with a cover plate or a shroud, whereby gap losses in the steam turbine to be reduced. On the shroud a plurality of sealing tips are formed, whereby the gap width between the shroud and the steam turbine housing is reduced. A gap flow passing through the gap can thereby be minimized and thus the thermodynamic efficiency of the steam turbine can be increased.
Insbesondere sind die Laufschaufeln einer Endstufe einer Niederdruckturbine lang in ihrer radialen Erstreckung gebildet und müssen somit den Belastungen einer hohen Umfangsgeschwindigkeit an den Schaufelspitzen der Laufschaufeln und einer erhöhten Erwärmung aufgrund von in der Endstufe vermehrt auftretenden Ventilationseffekten standhalten. Für die Endstufe kann auch der Werkstoff Titan eingesetzt werden, der sich neben einer hohen Korrosionsbeständigkeit durch eine hohe Festigkeit und ein geringes spezifisches Gewicht auszeichnet. Herkömmlich wird für letzte Laufreihen ein Deckband vorgesehen. Um die mechanische Belastung der Laufschaufel aufgrund der Fliehkraft hervorgerufen durch das Deckband so gering wie möglich zu halten, ist es notwendig das Deckband möglichst leichtgewichtig zu gestalten. Die abdichtende Breite der Deckbänder sind daher in ihrer axialen Erstreckung kürzer als in ihrer der zugehörigen Laufschaufel zugeordneten Breite. Dies reduziert die Dichteffizienz des Deckbands und senkt somit den Wirkungsgrad der Dampfturbine.In particular, the blades of a low-pressure turbine final stage are formed in their radial extension and thus must withstand the stresses of high circumferential velocity at the blade tips of the blades and increased heating due to increased fan effects in the final stage. For the final stage, the material titanium can be used, which is characterized in addition to a high corrosion resistance by a high strength and a low specific weight. Conventionally, a cover band is provided for last run rows. In order to keep the mechanical load of the blade due to the centrifugal force caused by the shroud as low as possible, it is necessary to make the shroud as lightweight as possible. The sealing width of the shrouds are therefore shorter in their axial extent than in their associated blade associated width. This reduces the sealing efficiency of the shroud and thus reduces the efficiency of the steam turbine.
Des Weiteren ist ein aufgrund von Kerbwirkung ohnehin stark belasteter Übergangsbereich zwischen der Schaufelspitze der Laufschaufel und dem Deckband einem Tropfenschlag unmittelbar ausgesetzt. Der Tropfenschlag führt zu einer kontinuierlichen Schlagbelastung der Laufschaufel, wodurch die Laufschaufel unter Umständen einem erheblichen Oberflächenabtrag ausgesetzt ist, was mit einer deutlich verkürzten Lebensdauer der Laufschaufel einhergeht.Furthermore, a due to notch effect anyway heavily loaded transition region between the blade tip of the blade and the shroud a drop impact is directly exposed. The dribble results in a continuous impact load on the blade, which may expose the blade to significant surface abrasion, resulting in a significantly reduced blade life.
Der Erfindung liegt die Aufgabe zugrunde eine Laufschaufel für eine Dampfturbine zu schaffen, bei der die oben genannten Probleme weitestgehend überwunden sind und die Laufschaufel vor Tropfenschlagerosion geschützt ist.The invention has for its object to provide a blade for a steam turbine, in which the above problems are largely overcome and the blade is protected against droplet erosion.
Die Aufgabe ist erfindungsgemäß mit einer Laufschaufel für eine Dampfturbine gemäß Anspruch 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen beschrieben.The object is achieved according to the invention with a blade for a steam turbine according to claim 1. Advantageous developments of the invention are described in the dependent claims.
Die erfindungsgemäße Laufschaufel für eine Dampfturbine weist ein Schaufelblatt, das eine Schaufelvorderkante und eine Schaufelspitze aufweist, und eine Deckplatte auf. Die Deckplatte weist eine Grundplatte, die an der Schaufelspitze des Schaufelblatts angebracht und im Wesentlichen parallel zur Maschinenachse der Dampfturbine im Einbauzustand ist, und eine Schildplatte auf, die stromauf der Schaufelvorderkante an der Grundplatte und von dieser radial nach innen vorstehend ausgebildet ist, so dass die Schaufelspitze mit ihrem Bereich der Schaufelvorderkante im Windschatten der Schildplatte liegt, wenn die Laufschaufel von einer Hauptdampfströmung der Dampfturbine angeströmt ist. Der im Windschatten der Schildplatte angeordnete Bereich der Laufschaufel ist somit vor einer durch die Hauptdampfströmung verursachten Tropfenschlagerosion geschützt. Zudem ist bei der erfindungsgemäß ausgebildeten Laufschaufel ein besonders belasteter Übergangsbereich von der Schaufelspitze zur Grundplatte vor der Tropfenschlagerosion geschützt, wodurch kostspielige bauliche Maßnahmen zur Verstärkung dieses Übergangsbereichs nicht vorgenommen werden müssen.The rotor blade according to the invention for a steam turbine has an airfoil, which has a blade leading edge and a blade tip, and a cover plate. The top plate has a base plate attached to the blade tip of the airfoil and substantially parallel to the engine axis of the steam turbine in the installed state, and a shield plate formed upstream of and protruding radially inward from the blade leading edge to the base plate, so that the Blade tip lies with its portion of the blade leading edge in the lee of the shield plate, when the blade has flowed from a main steam flow of the steam turbine. The arranged in the lee of the shield plate region of the blade is thus protected from a caused by the main steam flow drop impact erosion. In addition, in the case of the rotor blade designed according to the invention, a particularly loaded transition region from the blade tip to the base plate is protected against the drop impact erosion, whereby costly structural measures to reinforce this transitional area need not be made.
Die Schildplatte ist bevorzugt in einem Axialabstand zur Schaufelvorderkante luvseitig derselben angeordnet, wodurch die axiale Erstreckung der Grundplatte und somit die axiale Dichtungsbreite der Deckplatte groß ist. Eine im Betrieb der zugehörigen Dampfturbine an der Laufschaufel sich einstellende Dampfleckage ist dadurch minimiert, wodurch der Wirkungsgrad der Dampfturbine verbessert ist.The shield plate is preferably arranged at an axial distance from the vane leading edge of the same, whereby the axial extent of the base plate and thus the axial sealing width of the cover plate are large. A steam leakage occurring during operation of the associated steam turbine on the blade is thereby minimized, whereby the efficiency of the steam turbine is improved.
Die Schildplatte ist bevorzugt in ihrer radialen Erstreckung derart ausgebildet, dass ein sich im Betrieb der Dampfturbine leerseitig im Windschatten der Schildplatte ausbildender Totwasserbereich axial entlang der gesamten Grundplatte sich erstreckt. Der Totwasserbereich ist insbesondere rezirkulierend ausgebildet und die Hauptdampfströmung hat keinen direkten Kontakt mit der Grundplatte entlang des Totwasserbereichs, so dass sich durch die Radiallage der Innenkante der Schildplatte ein strömungsmechanisch effektiver Steigungswinkel der Deckplatte ergibt. Da also die Deckplattenunterseite die Hauptdampfströmung nicht direkt führt, braucht die Deckplattenunterseite von der Hauptdampfströmung nicht entsprechend kontaktiert zu sein. Dadurch braucht bei der Konstruktion der Deckplatte lediglich auf Festigkeitsanforderungen Rücksicht genommen werden, wodurch die Deckplatte leichter verglichen mit einer herkömmlichen Konstruktion ausgeführt ist und somit an der Schaufelspitze eine geringere Fliehkraftbelastung auftritt. Ferner ist bevorzugt die Schildplatte derart konstruiert, dass der Totwasserbereich während einer Umströmung der Laufschaufel kontinuierlich erhalten bleibt und nicht etwa eine instationäre Wirbelablösung von der Schildplatte stattfinden kann. Somit ist sichergestellt, dass der Übergangsbereich von der Schaufelspitze zur Grundplatte während des gesamten Betriebs der Dampfturbine vor der Tropfenschlagerosion geschützt ist. Ferner ist ein Auftreten von durch Wirbelablösung verursachten Schwingungen verhindert.The shield plate is preferably formed in its radial extent such that a dead water area forming empty side in the slipstream of the shield plate during operation of the steam turbine extends axially along the entire base plate. The dead water area is designed in particular recirculating and the main steam flow has no direct contact with the base plate along the dead water area, so that results in a fluidically effective pitch angle of the cover plate by the radial position of the inner edge of the shield plate. Thus, since the top plate bottom does not directly guide the main steam flow, the top plate bottom need not be contacted by the main steam flow accordingly. As a result, consideration must be given only to strength requirements in the construction of the cover plate, whereby the cover plate is made easier compared with a conventional construction and thus at the blade tip a lower centrifugal load occurs. Furthermore, the shield plate is preferably constructed in such a way that the dead water region is continuously maintained during a flow around the rotor blade and it is not possible for a transient vortex shedding to take place from the shield plate. This ensures that the transitional area from the blade tip to the base plate is protected from drop impact erosion during the entire operation of the steam turbine. Further, an occurrence prevented by vortex shedding caused vibrations.
Die Schaufelspitze ist bevorzugt zwischen der Schildplatte und der Grundplatte mit einem erosionsresistenten Schutzmaterial bedeckt, so dass die Schaufelspitze im Bereich der Schaufelvorderkante vor einer Tropfenschlagerosion geschützt ist. Das Schutzmaterial ist dazu handschuhartig über die Laufschaufelbereiche gezogen, die es schützen soll, beispielsweise über Bereiche der Schaufelspitze und/oder der Grundplatte und/oder der Schildplatte. Das Schutzmaterial kann zudem im Zuge von Wartung- bzw. Inspektionsarbeiten ausgetauscht werden. Als Folge daraus ergibt sich, dass das Schutzmaterial in seiner Haltbarkeit nur so gebildet zu sein braucht, wie es durch die vorgesehenen Wartungs- bzw. Inspektionsintervalle vorgegeben ist. Ferner kann mit der Formgebung des Schutzmaterials die Umströmung der Deckplatte günstig beeinflusst werden. So ist bevorzugtermaßen die Schaufelspitze zwischen der Schildplatte und der Grundplatte derart mit dem erosionsresistenten Schutzmaterial bedeckt, dass die Schildplatte an der Radialinnenkante von der Hauptdampfströmung ablösefrei umströmbar ist. Bevorzugt ist es ferner, dass die Schaufelvorderkante mit dem erosionsresistenten Schutzmaterial bedeckt ist, wodurch die Schaufelvorderkante vor einer Tropfenschlagerosion geschützt ist.The blade tip is preferably covered with an erosion-resistant protective material between the shield plate and the base plate, so that the blade tip is protected in the region of the blade leading edge from drop impact erosion. The protective material is to glove over the blade areas that it should protect, for example, over areas of the blade tip and / or the base plate and / or the shield plate. The protective material can also be replaced during maintenance or inspection work. As a result, it follows that the protective material needs to be formed in its durability only as specified by the scheduled maintenance or inspection intervals. Furthermore, with the shaping of the protective material, the flow around the cover plate can be favorably influenced. Thus, the blade tip between the shield plate and the base plate is preferably covered with the erosion-resistant protective material in such a way that the shield plate at the radial inner edge can be bypassed free of the main vapor flow. It is further preferred that the blade leading edge is covered with the erosion-resistant protective material, whereby the blade leading edge is protected from drop impact erosion.
Im Folgenden werden bevorzugte Ausführungsformen einer erfindungsgemäßen Laufschaufel anhand der beigefügten schematischen Zeichnungen erläutert. Es zeigen:
-
Fig. 1 eine erste Ausführungsform der erfindungsgemäßen Laufschaufel mit einer Deckplatte, die eine Schildplatte und eine Grundplatte aufweist, -
Fig. 2 bis 4 weitere Ausführungsformen der erfindungsgemäßen Laufschaufel, bei der die Schaufelspitze mit einem erosionsfesten Schutzmaterial bedeckt ist, und -
Fig. 5 eine herkömmliche Laufschaufel mit einem Deckband.
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Fig. 1 a first embodiment of the blade according to the invention with a cover plate having a shield plate and a base plate, -
Fig. 2 to 4 Further embodiments of the blade according to the invention, in which the blade tip is covered with a erosion-resistant protective material, and -
Fig. 5 a conventional blade with a shroud.
In den
Die in
Der Totwasserbereich 13 wird von einem Wirbel 15 gebildet, von dem die Hauptdampfströmung geführt wird. Der Wirbel 15 definiert den strömungsmechanisch effektiven Steigungswinkel 16 der Deckplatte 5, der durch die Konstruktion der Schildplatte 6 vorherbestimmt ist. Da der Steigungswinkel 16 von der Lage der radial innenliegenden Kante der Schildplatte 6 und nicht von der laufschaufelseitigen Kontur der Grundplatte 7 abhängt, ist die Grundplatte 7 plattenartig und dadurch leichtgewichtig gebaut. Die Grundplatte 7 kann daher in ihrer Axialerstreckung lang ausgebildet sein ohne die Laufschaufel 1 unzulässig hoch mechanisch zu belasten. Aufgrund der großen Axialerstreckung der Grundplatte 7 können zusätzliche Dichtspitzen 9 an der Grundplatte 7 vorgesehen werden, wodurch die Dichteffizienz der Deckplatte 5 erhöht und somit der thermodynamische Wirkungsgrad der zugehörigen Dampfturbine gesteigert ist.The
Inspektionsarbeiten einfach gewechselt werden kann. In
Inspection work can be easily changed. In
Claims (6)
wobei die Schildplatte (6) in einem Axialabstand zur Schaufelvorderkante (3) luvseitig derselben angeordnet ist.Blade according to claim 1,
wherein the shield plate (6) is arranged at an axial distance to the blade leading edge (3) windward thereof.
wobei die Schildplatte (6) in ihrer radialen Erstreckung derart ausgebildet ist, dass ein sich im Betrieb der Dampfturbine leeseitig im Windschatten der Schildplatte (6) ausbildender Totwasserbereich (13) axial entlang der gesamten Grundplatte (7) sich erstreckt.Blade according to claim 1 or 2,
wherein the shield plate (6) is formed in its radial extent such that a leeward during operation of the steam turbine in the lee of the shield plate (6) forming dead water region (13) axially along the entire base plate (7) extends.
wobei die Schaufelspitze (4) zwischen der Schildplatte (6) und der Grundplatte (7) mit einem erosionsresistenten Schutzmaterial (17) bedeckt ist, so dass die Schaufelspitze (4) im Bereich der Schaufelvorderkante (3) vor einer Tropfenschlagerosion geschützt ist.Blade according to claim 1 or 2,
wherein the blade tip (4) between the shield plate (6) and the base plate (7) with an erosion resistant protective material (17) is covered, so that the blade tip (4) in the region of the blade leading edge (3) is protected against a drop impact erosion.
wobei die Schaufelspitze (4) zwischen der Schildplatte (6) und der Grundplatte (7) derart mit dem erosionsresistenten Schutzmaterial (17) bedeckt ist, dass die Schildplatte (6) an der Radialinnenkante (12) von der Hauptdampfströmung ablösefrei umströmbar ist.Blade according to claim 4,
wherein the blade tip (4) between the shield plate (6) and the base plate (7) with the erosion resistant protective material (17) is covered, that the shield plate (6) at the radial inner edge (12) from the main steam flow is free to flow around.
wobei die Schaufelvorderkante (3) derart mit dem erosionsresistenten Schutzmaterial (17) bedeckt ist, dass die gesamte Schaufelvorderkante (3) vor einer Tropfenschlagerosion geschützt ist.Blade according to claim 4 or 5,
wherein the blade leading edge (3) is covered with the erosion resistant protective material (17) such that the entire blade leading edge (3) is protected from drop impact erosion.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10186573A EP2439376A1 (en) | 2010-10-05 | 2010-10-05 | Shrouded rotor blade for a steam turbine |
CN201180048491.1A CN103154436B (en) | 2010-10-05 | 2011-10-05 | For the rotor blade with cover plate of steam turbine |
PCT/EP2011/067366 WO2012045765A1 (en) | 2010-10-05 | 2011-10-05 | Rotor blade having a cover plate for a steam turbine |
EP11766987.9A EP2609292A1 (en) | 2010-10-05 | 2011-10-05 | Rotor blade having a cover plate for a steam turbine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10186573A EP2439376A1 (en) | 2010-10-05 | 2010-10-05 | Shrouded rotor blade for a steam turbine |
Publications (1)
Publication Number | Publication Date |
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EP2439376A1 true EP2439376A1 (en) | 2012-04-11 |
Family
ID=43754769
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10186573A Withdrawn EP2439376A1 (en) | 2010-10-05 | 2010-10-05 | Shrouded rotor blade for a steam turbine |
EP11766987.9A Withdrawn EP2609292A1 (en) | 2010-10-05 | 2011-10-05 | Rotor blade having a cover plate for a steam turbine |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11766987.9A Withdrawn EP2609292A1 (en) | 2010-10-05 | 2011-10-05 | Rotor blade having a cover plate for a steam turbine |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP2439376A1 (en) |
CN (1) | CN103154436B (en) |
WO (1) | WO2012045765A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014020307A (en) * | 2012-07-19 | 2014-02-03 | Mitsubishi Heavy Ind Ltd | Gas turbine |
WO2020021192A1 (en) * | 2018-07-24 | 2020-01-30 | Safran Aircraft Engines | Turbine blade |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB214985A (en) * | 1923-12-22 | 1925-02-19 | Erste Bruenner Maschinen Fab | Improvements in and relating to steam or gas turbines |
EP1780379A2 (en) * | 2005-10-31 | 2007-05-02 | Kabushiki Kaisha Toshiba | Steam turbine and hydrophilic coating material used therefor |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998044240A1 (en) * | 1997-04-01 | 1998-10-08 | Siemens Aktiengesellschaft | Surface structure for the wall of a flow channel or a turbine blade |
US7422415B2 (en) * | 2006-05-23 | 2008-09-09 | General Electric Company | Airfoil and method for moisture removal and steam injection |
EP2072757A1 (en) * | 2007-12-20 | 2009-06-24 | Siemens Aktiengesellschaft | Erosion protection shield for a rotating blade |
-
2010
- 2010-10-05 EP EP10186573A patent/EP2439376A1/en not_active Withdrawn
-
2011
- 2011-10-05 WO PCT/EP2011/067366 patent/WO2012045765A1/en active Application Filing
- 2011-10-05 CN CN201180048491.1A patent/CN103154436B/en not_active Expired - Fee Related
- 2011-10-05 EP EP11766987.9A patent/EP2609292A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB214985A (en) * | 1923-12-22 | 1925-02-19 | Erste Bruenner Maschinen Fab | Improvements in and relating to steam or gas turbines |
EP1780379A2 (en) * | 2005-10-31 | 2007-05-02 | Kabushiki Kaisha Toshiba | Steam turbine and hydrophilic coating material used therefor |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014020307A (en) * | 2012-07-19 | 2014-02-03 | Mitsubishi Heavy Ind Ltd | Gas turbine |
US9360216B2 (en) | 2012-07-19 | 2016-06-07 | Mitsubishi Heavy Industries Aero Engines, Ltd. | Gas turbine |
WO2020021192A1 (en) * | 2018-07-24 | 2020-01-30 | Safran Aircraft Engines | Turbine blade |
FR3084398A1 (en) * | 2018-07-24 | 2020-01-31 | Safran Aircraft Engines | TURBINE DAWN |
US11428109B2 (en) | 2018-07-24 | 2022-08-30 | Safran Aircraft Engines | Turbine blade |
Also Published As
Publication number | Publication date |
---|---|
CN103154436B (en) | 2015-08-19 |
CN103154436A (en) | 2013-06-12 |
WO2012045765A1 (en) | 2012-04-12 |
EP2609292A1 (en) | 2013-07-03 |
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