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EP2220342A1 - Erosion protection shield for rotor blades - Google Patents

Erosion protection shield for rotor blades

Info

Publication number
EP2220342A1
EP2220342A1 EP08864232A EP08864232A EP2220342A1 EP 2220342 A1 EP2220342 A1 EP 2220342A1 EP 08864232 A EP08864232 A EP 08864232A EP 08864232 A EP08864232 A EP 08864232A EP 2220342 A1 EP2220342 A1 EP 2220342A1
Authority
EP
European Patent Office
Prior art keywords
protection shield
erosion protection
rotor
blade
erosion
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.)
Granted
Application number
EP08864232A
Other languages
German (de)
French (fr)
Other versions
EP2220342B1 (en
Inventor
Norbert Sürken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP08864232A priority Critical patent/EP2220342B1/en
Priority to PL08864232T priority patent/PL2220342T3/en
Publication of EP2220342A1 publication Critical patent/EP2220342A1/en
Application granted granted Critical
Publication of EP2220342B1 publication Critical patent/EP2220342B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • 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
    • F01D5/146—Shape, i.e. outer, aerodynamic form of blades with tandem configuration, split blades or slotted 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
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow 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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
    • 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
    • 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
    • F05D2250/00—Geometry
    • F05D2250/30—Arrangement of components
    • F05D2250/34—Arrangement of components translated
    • 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
    • F05D2260/00—Function
    • F05D2260/95—Preventing corrosion

Definitions

  • the invention relates to a blade comprising an airfoil and a blade root, wherein the airfoil has a suction and pressure side and an inflow and outflow edge.
  • turbomachines among other things, runners and vanes are used. Hydraulic turbines, steam and gas turbines, wind turbines, centrifugal pumps and centrifugal compressors as well as propellers are summarized under the collective term turbomachinery. All these machines have in common that they serve the purpose of extracting energy from one fluid in order to drive another machine or, conversely, to supply energy to a fluid in order to increase its pressure.
  • steam is used as the fluid.
  • This fluid is also referred to as flow medium. It is usual that the steam initially flows into a high pressure turbine, said steam has a temperature of up to 620 0 C and a pressure of up to 320bar. After the flow through the
  • High-pressure turbine section flows through the flow medium through a medium-pressure turbine section and finally through a low-pressure turbine section.
  • the pressure and the temperature of the vapor decreases here.
  • the expansion of the steam in the low-pressure turbine part it can happen that spontaneously
  • mist droplets which are also called primary droplets and are very small.
  • Such primary droplets grow to a diameter of about 0.2 ⁇ m.
  • These primary droplets accumulate on the vanes and blades and form a larger one as a result of a water film
  • the invention whose object is to provide a simple way to avoid damage to a blade, which is loaded by water droplets, which in partial load operations a locally negative axial velocity in the region of the blade trailing edge and thereby hit the running blade trailing edge.
  • a blade comprising an airfoil and a blade root, wherein the airfoil has a suction and pressure side and an inflow and outflow edge, wherein an erosion protection shield for preventing drop impact erosion is arranged in front of the trailing edge.
  • This further component is an erosion protection shield which is arranged in front of the trailing edge in such a way that the drops of water which occur in the partial load operation do not strike the blade outlet edge but the erosion protection shield. Accordingly, the drops of water can no longer cause any damage to the trailing edge of the blade since they are prevented in the first place from hitting the blade since they hit the erosion shield and are thereby slowed down or dissolved.
  • These measures according to the invention eliminate the measures known in the prior art for avoiding damage by water droplets.
  • the invention has the advantage that virtually no changes need to be made to the existing blade.
  • the only change to the rotor blade is to allow the inclusion or arrangement of erosion protection shield.
  • the erosion protection shield is in this case arranged such that drops of water which occur in partial load operation and have a locally negative axial velocity in the region of the blade trailing edge can not impinge on the blade trailing edge. Damage is thus avoided from the outset.
  • the erosion protection shield arranged spaced from the trailing edge of the blade root.
  • the distance of the erosion protection shield to the trailing edge should be such It can be chosen that the flow of the steam does not suffer losses in the relaxation in a turbine stage.
  • the erosion protection shield is aligned along the longitudinal orientation of the airfoil.
  • the damage mainly occurs in the vicinity of the blade root and propagates in the longitudinal direction of the blade. An alignment of the erosion protection shield along the longitudinal alignment therefore leads to a prevention of further damage.
  • the blade has a length L, wherein the length of erosion protection shield is selected such that the length 1% - 100% of the length L of the rotor blade has.
  • the blade has a chord length S, wherein the erosion shield is formed such that the width of the erosion shield is about 5% to 75% of the chord length S.
  • the blade has a pressure side and a suction side, wherein the erosion protection shield is arranged in front of the suction side. It has been shown that most damages occur on the suction side of the blade. Appropriately, it is therefore proposed to arrange the erosion protection shield in front of this suction side.
  • the erosion protection shield is frictionally connected to the blade root.
  • Equally expedient is to connect the erosion protection shield cohesively or positively with the blade root.
  • a frictional connection is created by the application of force, which is generated by suitable bias.
  • the cohesion of the non-positive connection can be ensured purely by static friction.
  • Formative connections are the result of the interaction of at least two partners.
  • the positive connection is caused by forces caused by operating conditions.
  • Cohesive compounds are characterized by bonding partners that are held together by atomic or molecular forces.
  • the erosion protection shield and the blade are formed as a single integral component.
  • the erosion protection shield can be connected to the turbine blade with a comparatively high binding force or holding force.
  • the erosion protection shield has a trailing edge and a leading edge, the trailing edge projecting beyond the trailing edge of the blade.
  • the erosion protection shield covers, as it were, a larger area, preventing the droplets from bouncing on subsequently arranged moving blades. This makes it possible to reduce the erosion protection signs over the entire blade ring.
  • the erosion protection shield has a turbine profiling with suction and pressure side.
  • the erosion shield is able, as well as the blade, to convert the thermal energy of the vapor into kinetic energy.
  • the erosion shield is formed of an erosion resistant material, such as Stellite, Ultimet, ⁇ - or ß-titanium or hardened steel.
  • the erosion protection shield has a dovetail foot, wherein the blade root is designed for receiving the dovetail foot. As a result, a fairly simple and cost-effective way is shown to attach the erosion protection shield to the turbine blade root.
  • the Erosi- onstikschild is bent around the longitudinal axis. Depending on the present flow conditions of the flow medium, this can lead to an improvement in the efficiency.
  • Figure 1 is a perspective view of a part of a
  • Figure 2 is another perspective view of a
  • Figure 3 is a side view of a blade with
  • Figure 4 is a perspective view of a part of a
  • Figure 5 is a side view of the erosion protection shield.
  • FIG. 1 shows a perspective view of a part of a turbine stage 1.
  • the turbine stage 1 comprises a plurality of rotor blades 2, which are arranged around a common rotational axis not shown in detail in FIG. 1 in a rotor 3.
  • the blades 2 rotate at a speed of up to 3600 revolutions per minute.
  • the rotor blade 2 has an airfoil 4 and a blade root 5.
  • the blade 4 is profiled and has a suction side and not in Figure 1 visible pressure side 7.
  • the blade 2 has a leading edge 8 not visible in FIG. 1 and a trailing edge 9.
  • the blade root 5 is held on the rotor 3 via a lavall, rider, plug, hammer, sawtooth or pine tree foot.
  • a Christmas tree foot is exemplified.
  • an erosion protection shield 10 is arranged on the blade root 5.
  • the erosion protection shield 10 is made of an erosion resistant material, such as e.g. stellite,
  • the erosion protection shield 10 is arranged to prevent drop impact erosion in front of the trailing edge 9.
  • the blade 2 is formed along a longitudinal orientation 11, wherein also the erosion protection shield 10 is aligned along this longitudinal direction 11.
  • the longitudinal alignment 11 is substantially identical to the radial direction, which is perpendicular to the rotation axis, not shown.
  • the erosion protection shield 10 is spaced at a distance d from the outflow edge 9.
  • the distance d is in this case selected such that it leads to low flow losses in the turbine stage 1.
  • the blade 2 has a length L.
  • the erosion protection shield 10 in this case has a length of 1% to 100% of the length L.
  • the airfoil 4 has a chord length S, wherein the erosion protection shield 10 has a width B of 5% to 75% of the chord length S.
  • the erosion protection shield 10 is frictionally with the
  • Blade foot 5 connected.
  • the blade root 5 a dovetail foot-like recess 12, in which the Erosion protection shield 10, which has a dovetail foot 13, can be inserted.
  • the erosion protection shield 10 is connected to the blade root 5 in a cohesive or form-fitting manner.
  • the erosion protection shield 10 is arranged in front of the suction side 6 of the airfoil 4.
  • the dovetail 13 is straight.
  • the dovetail 13 may be executed bent, which is not shown in Figure 4.
  • the recess 12 is formed straight for the dovetail 13 and is directed substantially parallel to the suction side 6 at the trailing edge 9 substantially.
  • the erosion protection shield 10 and the blade 2 can be formed in a alternative embodiment of a single integral component. This can be done by precision finish forging, investment casting, envelope forging with subsequent milling, milling, eroding or other known methods.
  • FIG. 2 shows a perspective view of a part of a turbine stage 1.
  • the erosion protection shield 10 is shown in the installed state.
  • FIG. 3 shows a side view of the turbine stage 1.
  • the erosion protection shield 10 has a front edge 14 and a trailing edge 15.
  • the erosion protection shield 10 is in this case arranged on the blade root 5 such that the trailing edge 15 protrudes beyond the trailing edge 9.
  • FIG. 5 shows a side view of the erosion protection shield 10.
  • the erosion protection shield 10 is formed in longitudinal direction 11 with a rectangular or triangular profile when viewed in cross-section.
  • the erosion protection shield 10 a turbine profiling with suction and pressure side, which is not shown in Figure 5.
  • the erosion protection shield 10 can be designed bent around the longitudinal alignment 11, which leads to a bent dovetail foot 13, which are arranged in a curved recess 12.
  • the trailing edge 15 of the erosion protection shield 10 protrudes beyond the trailing edge 9 by a distance 1.
  • the erosion protection shield 10 can be arranged directly on the rotor 3 in an alternative embodiment, which is not shown in the figures 1 to 5.
  • the erosion protection shield 10 may be provided with support wings in an alternative embodiment.
  • the support wings are designed such that they bear against the blade profile. This increases the range of application of erosion protection shield 10.
  • the support wings are not shown in more detail in the figures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The invention relates to a rotor blade (2) for a turbomachine, particularly a steam turbine, comprising a turbine blade (4) and a blade base (5), wherein the turbine blade (4) has a suction side (6) and a pressure side (7), as well as an inflow edge (8) and an outflow edge (9), wherein an erosion protection shield (10) is disposed at a distance in front of the outflow edge (9) in order to avoid liquid impingement erosion.

Description

Beschreibungdescription

Erosionsschutzschild für LaufschaufelnErosion protection shield for blades

Die Erfindung betrifft eine Laufschaufel umfassend ein Schaufelblatt und einen Schaufelfuß, wobei das Schaufelblatt eine Saug- und Druckseite sowie eine Anström- und Abströmkante aufweist .The invention relates to a blade comprising an airfoil and a blade root, wherein the airfoil has a suction and pressure side and an inflow and outflow edge.

In Strömungsmaschinen werden unter anderem Lauf- und Leitschaufeln eingesetzt. Unter der Sammelbezeichnung Strömungsmaschinen werden Wasserturbinen, Dampf- und Gasturbinen, Windräder, Kreiselpumpen und Kreiselverdichter sowie Propel- ler zusammengefasst . Allen diesen Maschinen ist gemeinsam, dass sie dem Zweck dienen, einem Fluid Energie zu entziehen, um damit eine andere Maschine anzutreiben oder umgekehrt einem Fluid Energie zuzuführen, um dessen Druck zu erhöhen.In turbomachines, among other things, runners and vanes are used. Hydraulic turbines, steam and gas turbines, wind turbines, centrifugal pumps and centrifugal compressors as well as propellers are summarized under the collective term turbomachinery. All these machines have in common that they serve the purpose of extracting energy from one fluid in order to drive another machine or, conversely, to supply energy to a fluid in order to increase its pressure.

In einer Dampfturbine als Ausführungsform einer Strömungsmaschine wird Dampf als Fluid verwendet. Dieses Fluid wird auch als Strömungsmedium bezeichnet. Es ist üblich, dass der Dampf zunächst in eine Hochdruckteilturbine einströmt, wobei dieser Dampf eine Temperatur von bis zu 6200C und einen Druck von bis zu 320bar aufweist. Nach der Durchströmung durch dieIn a steam turbine as an embodiment of a turbomachine, steam is used as the fluid. This fluid is also referred to as flow medium. It is usual that the steam initially flows into a high pressure turbine, said steam has a temperature of up to 620 0 C and a pressure of up to 320bar. After the flow through the

Hochdruck-Teilturbine strömt das Strömungsmedium durch eine Mitteldruck-Teilturbine und schließlich durch eine Niederdruck-Teilturbine. Der Druck und die Temperatur des Dampfes nimmt hierbei ab. Bei der Entspannung des Dampfes in der Nie- derdruck-Teilturbine kann es vorkommen, dass durch spontaneHigh-pressure turbine section flows through the flow medium through a medium-pressure turbine section and finally through a low-pressure turbine section. The pressure and the temperature of the vapor decreases here. During the expansion of the steam in the low-pressure turbine part, it can happen that spontaneously

Kondensation sich Nebeltröpfchen bilden, die auch als Primärtröpfchen bezeichnet werden und sehr klein sind. Solche Primärtröpfchen wachsen auf Durchmesser von etwa 0,2μm an. Diese Primärtröpfchen sammeln sich auf den Leit- und Laufschaufeln an und bilden in Folge eines Wasserfilms einen größerenCondensation form mist droplets, which are also called primary droplets and are very small. Such primary droplets grow to a diameter of about 0.2 μm. These primary droplets accumulate on the vanes and blades and form a larger one as a result of a water film

Sekundärtropfen mit einem Durchmesser bis etwa 400μm. Noch größere Wassertröpfchen sind in der Dampfturbinenströmung nicht stabil, da sie wieder zerstäubt werden. Diese Tropfen verursachen die sogenannte Tropfenschlagerosion, bei der beim Aufprall eines Tropfens auf die Laufschaufel es zu einem Materialabtrag kommen kann.Secondary drops with a diameter up to about 400μm. Even larger water droplets are not stable in the steam turbine flow since they are atomized again. These drops cause the so-called drop impact erosion, which can lead to a material removal on the impact of a drop on the blade.

Es kann zu dem vorkommen, dass für verschiedene Betriebspunkte der Niederdruck-Teilturbine, beispielsweise im Teillastbetrieb, es zu örtlich negativen Axialgeschwindigkeiten im Bereich der LaufSchaufelhinterkante kommen kann. Diese Be- wegung des Dampfes führt dazu, dass im Dampf enthaltene Wassertröpfchen zurück in die Beschaufelung strömen. Die Wassertröpfchen haben hierbei eine solch geringe Umfangskomponente, dass sie mit hoher Relativgeschwindigkeit auf die Hinterkante des Laufschaufelprofils auf der Saugseite treffen und somit zu deutlichen Erosionsschädigungen führen. Dies führt zu einer erheblichen Schädigung der Beschaufelung.It may happen that for different operating points of the low-pressure turbine part, for example, in partial load operation, it may come to locally negative axial velocities in the region of the blade trailing edge. This movement of the steam causes water droplets contained in the steam to flow back into the blading. The water droplets in this case have such a small peripheral component that they strike the trailing edge of the blade profile on the suction side at high relative speed and thus lead to significant erosion damage. This leads to considerable damage to the blading.

Um solche Schädigungen zu vermeiden ist es zum einen bekannt, die im Dampf vorhandenen Wassertropfen durch entsprechende Betriebsbereiche zu minimieren. Des Weiteren kann eine Verdickung der Schaufelhinterkanten berücksichtigt werden. Ebenso ist es bekannt, bei größeren Erosionsschädigungen im Hinterkantenbereich Schleifmaßnahmen durchzuführen. Des Weiteren ist bekannt, die Hinterkante zu härten, um die Widerstands- fähigkeit der Schaufel zu erhöhen. Schließlich ist es auch bekannt die Bildung der Sekundärtropfen mittels Absaugeinrichtungen und gezieltem Axialspaltdesign zu vermeiden.In order to avoid such damage, it is known on the one hand to minimize the water droplets present in the steam by means of appropriate operating ranges. Furthermore, a thickening of the blade trailing edges can be taken into account. It is also known to carry out at larger erosion damage in the trailing edge area grinding measures. Furthermore, it is known to harden the trailing edge to increase the resistance of the blade. Finally, it is also known to avoid the formation of secondary drops by means of suction and targeted Axialspaltdesign.

Wünschenswert wäre es eine einfache Möglichkeit zu haben, um die Beschädigung der Laufschaufeln durch die im Teillastbetrieb auftretenden Wassertröpfchen, die örtlich negative Axialgeschwindigkeiten aufweisen, zu vermeiden.It would be desirable to have an easy way to avoid the damage of the blades by the water droplets occurring in part-load operation, which have locally negative axial velocities.

An dieser Stelle setzt die Erfindung an, dessen Aufgabe es ist, eine einfache Möglichkeit anzugeben, um eine Schädigung einer Laufschaufel zu vermeiden, die durch Wassertropfen belastet wird, die in Teillastbetrieben eine örtlich negative Axialgeschwindigkeit im Bereich der LaufSchaufelhinterkante aufweisen und dadurch auf die LaufSchaufelhinterkante treffen .At this point, the invention, whose object is to provide a simple way to avoid damage to a blade, which is loaded by water droplets, which in partial load operations a locally negative axial velocity in the region of the blade trailing edge and thereby hit the running blade trailing edge.

Diese Aufgabe wird gelöst durch eine Laufschaufel umfassend ein Schaufelblatt und einen Schaufelfuß, wobei das Schaufelblatt eine Saug- und Druckseite sowie eine Anström- und Abströmkante aufweist, wobei ein Erosionsschutzschild zum Verhindern von Tropfenschlagerosion vor der Abströmkante angeordnet ist.This object is achieved by a blade comprising an airfoil and a blade root, wherein the airfoil has a suction and pressure side and an inflow and outflow edge, wherein an erosion protection shield for preventing drop impact erosion is arranged in front of the trailing edge.

Mit der Erfindung wird vorgeschlagen ein weiteres Bauteil neben dem Rotor und den Laufschaufeln einzusetzen. Dieses weitere Bauteil ist ein Erosionsschutzschild, das derart vor die Abströmkante angeordnet wird, dass die im Teillastbetrieb auftretenden Wassertropfen nicht auf die Laufschaufelabström- kante treffen, sondern auf das Erosionsschutzschild. Die Wassertropfen können demnach keine Schädigung mehr an der Abströmkante der Laufschaufel hervorrufen, da sie von vornherein gehindert werden, auf die Laufschaufel zu treffen, da sie auf das Erosionsschutzschild treffen und dadurch abgebremst bzw. aufgelöst werden. Durch diese erfindungsgemäßen Maßnahmen entfallen die im Stand der Technik bekannten Maßnahmen zur Vermeidung der Schädigung durch Wassertropfen. Insbesondere weist die Erfindung den Vorteil auf, dass an der beste- henden Laufschaufel so gut wie keine Änderungen vorgenommen werden müssen. Die einzige Änderung an der Laufschaufei besteht darin, die Aufnahme bzw. Anordnung des Erosionsschutzschildes zu ermöglichen. Das Erosionsschutzschild ist hierbei derart angeordnet, dass Wassertropfen, die im Teillastbetrieb auftreten und eine örtlich negative Axialgeschwindigkeit im Bereich der Laufschaufelhinterkante aufweisen, nicht auf die Laufschaufelhinterkante auftreffen können. Eine Schädigung ist somit von vornherein vermieden.With the invention it is proposed to use a further component in addition to the rotor and the rotor blades. This further component is an erosion protection shield which is arranged in front of the trailing edge in such a way that the drops of water which occur in the partial load operation do not strike the blade outlet edge but the erosion protection shield. Accordingly, the drops of water can no longer cause any damage to the trailing edge of the blade since they are prevented in the first place from hitting the blade since they hit the erosion shield and are thereby slowed down or dissolved. These measures according to the invention eliminate the measures known in the prior art for avoiding damage by water droplets. In particular, the invention has the advantage that virtually no changes need to be made to the existing blade. The only change to the rotor blade is to allow the inclusion or arrangement of erosion protection shield. The erosion protection shield is in this case arranged such that drops of water which occur in partial load operation and have a locally negative axial velocity in the region of the blade trailing edge can not impinge on the blade trailing edge. Damage is thus avoided from the outset.

Das Erosionsschutzschild zur Abströmkante des Schaufelfußes beabstandet angeordnet. Der Abstand des Erosionsschutzschildes zur Abströmkante sollte hierbei derart gewählt werden, dass die Strömung des Dampfes keine Verluste bei der Entspannung in einer Turbinenstufe erleidet.The erosion protection shield arranged spaced from the trailing edge of the blade root. The distance of the erosion protection shield to the trailing edge should be such It can be chosen that the flow of the steam does not suffer losses in the relaxation in a turbine stage.

In einer vorteilhaften Weiterbildung der Erfindung ist das Erosionsschutzschild entlang der Längsausrichtung des Schaufelblattes ausgerichtet. Die Schädigungen tauchen vorwiegend in der Nähe des Schaufelfußes auf und breiten sich in der Längsrichtung der Schaufel aus. Eine Ausrichtung des Erosionsschutzschildes entlang der Längsausrichtung führt daher zu einer Verhinderung einer weiteren Beschädigung.In an advantageous development of the invention, the erosion protection shield is aligned along the longitudinal orientation of the airfoil. The damage mainly occurs in the vicinity of the blade root and propagates in the longitudinal direction of the blade. An alignment of the erosion protection shield along the longitudinal alignment therefore leads to a prevention of further damage.

In einer vorteilhaften Weiterbildung weist die Laufschaufel eine Länge L auf, wobei die Länge des Erosionsschutzschildes derart gewählt ist, dass die Länge 1% - 100% der Länge L der Laufschaufei aufweist.In an advantageous development, the blade has a length L, wherein the length of erosion protection shield is selected such that the length 1% - 100% of the length L of the rotor blade has.

In einer vorteilhaften Weiterbildung weist das Schaufelblatt eine Sehnenlänge S auf, wobei das Erosionsschutzschild derart ausgebildet ist, dass die Breite des Erosionsschutzschildes ungefähr 5% bis 75% der Sehnenlänge S beträgt. Durch die gezielte Auswahl der Größe des Erosionsschutzschildes ist eine genaue Anpassung an die Betriebsbedingungen der Strömungsmaschine möglich.In an advantageous development, the blade has a chord length S, wherein the erosion shield is formed such that the width of the erosion shield is about 5% to 75% of the chord length S. Through the targeted selection of the size of the erosion protection shield, an exact adaptation to the operating conditions of the turbomachine is possible.

In einer vorteilhaften Weiterbildung weist das Schaufelblatt eine Druckseite und eine Saugseite auf, wobei das Erosionsschutzschild vor der Saugseite angeordnet ist. Es hat sich gezeigt, dass die meisten Beschädigungen an der Saugseite des Schaufelblattes auftreten. Zweckmäßigerweise wird daher vor- geschlagen, das Erosionsschutzschild vor dieser Saugseite anzuordnen .In an advantageous development, the blade has a pressure side and a suction side, wherein the erosion protection shield is arranged in front of the suction side. It has been shown that most damages occur on the suction side of the blade. Appropriately, it is therefore proposed to arrange the erosion protection shield in front of this suction side.

In einer vorteilhaften Weiterbildung ist das Erosionsschutzschild kraftschlüssig mit dem Schaufelfuß verbunden. Ebenso zweckmäßig ist es, das Erosionsschutzschild stoffschlüssig oder formschlüssig mit dem Schaufelfuß zu verbinden. Eine kraftschlüssige Verbindung entsteht durch die Anwendung von Kraft, welche durch geeignete Vorspannung erzeugt wird. Beispielsweise kann der Zusammenhalt der kraftschlüssigen Verbindung rein durch Haftreibung gewährleistet sein. Form- schlüssige Verbindungen hingegen entstehen durch das Ineinandergreifen von mindestens zwei Verbindungspartnern. Der Form- schluss wird dabei durch Kräfte verursacht, die durch Betriebsbedingungen entstehen. Stoffschlüssige Verbindungen sind durch Verbindungspartner gekennzeichnet, die durch ato- mare oder molekulare Kräfte zusammengehalten werden.In an advantageous development, the erosion protection shield is frictionally connected to the blade root. Equally expedient is to connect the erosion protection shield cohesively or positively with the blade root. A frictional connection is created by the application of force, which is generated by suitable bias. For example, the cohesion of the non-positive connection can be ensured purely by static friction. Formative connections, on the other hand, are the result of the interaction of at least two partners. The positive connection is caused by forces caused by operating conditions. Cohesive compounds are characterized by bonding partners that are held together by atomic or molecular forces.

In einer vorteilhaften Weiterbildung wird das Erosionsschutzschild und die Laufschaufel als ein einziges integrales Bauteil ausgebildet. Durch diese Maßnahme kann das Erosions- schutzschild mit einer vergleichsweise großen Bindekraft bzw. Haltekraft an die Turbinenschaufel verbunden sein.In an advantageous development, the erosion protection shield and the blade are formed as a single integral component. As a result of this measure, the erosion protection shield can be connected to the turbine blade with a comparatively high binding force or holding force.

In einer weiteren vorteilhaften Weiterbildung weist das Erosionsschutzschild eine Hinterkante und eine Vorderkante auf, wobei die Hinterkante über die Abströmkante der Laufschaufel ragt. Dies führt dazu, dass das Erosionsschutzschild sozusagen einen größeren Bereich abdeckt, wodurch die Tröpfchen daran gehindert werden, auf nachfolgend angeordnete Laufschaufeln zu prallen. Dadurch ist eine Reduzierung der Erosi- onsschutzschilder über den gesamten Schaufelkranz möglich.In a further advantageous development, the erosion protection shield has a trailing edge and a leading edge, the trailing edge projecting beyond the trailing edge of the blade. As a result, the erosion protection shield covers, as it were, a larger area, preventing the droplets from bouncing on subsequently arranged moving blades. This makes it possible to reduce the erosion protection signs over the entire blade ring.

Somit wäre es möglich, die Anzahl der Erosionsschutzschilder zu vermindern, um dadurch kostengünstiger eine Strömungsmaschine zu fertigen.Thus, it would be possible to reduce the number of anti-erosion signs to thereby more cost-effectively manufacture a turbomachine.

In einer vorteilhaften Weiterbildung weist das Erosionsschutzschild eine Turbinenprofilierung mit Saug- und Druckseite auf. Dadurch ist das Erosionsschutzschild in der Lage, ebenso wie die Laufschaufel die thermische Energie des Dampfes in kinetische Energie umzuwandeln.In an advantageous development, the erosion protection shield has a turbine profiling with suction and pressure side. As a result, the erosion shield is able, as well as the blade, to convert the thermal energy of the vapor into kinetic energy.

Vorzugsweise ist das Erosionsschutzschild aus einem erosionsbeständigen Material ausgebildet, wie z.B. Stellite, Ultimet, α- oder ß-Titan oder gehärtetem Stahl. Vorteilhafter Weise weist das Erosionsschutzschild einen Schwalbenschwanzfuß auf, wobei der Schaufelfuß zum Aufnehmen des Schwalbenschwanzfußes ausgebildet ist. Dadurch ist eine recht einfache und kostengünstige Möglichkeit dargestellt, um das Erosionsschutzschild an den Turbinenschaufelfuß zu befestigen .Preferably, the erosion shield is formed of an erosion resistant material, such as Stellite, Ultimet, α- or ß-titanium or hardened steel. Advantageously, the erosion protection shield has a dovetail foot, wherein the blade root is designed for receiving the dovetail foot. As a result, a fairly simple and cost-effective way is shown to attach the erosion protection shield to the turbine blade root.

In einer weiteren vorteilhaften Weiterbildung ist das Erosi- onsschutzschild um die Längsachse gebogen. Je nach vorliegenden Strömungsverhältnissen des Strömungsmediums kann dies zu einer Verbesserung des Wirkungsgrades führen.In a further advantageous embodiment, the Erosi- onsschutzschild is bent around the longitudinal axis. Depending on the present flow conditions of the flow medium, this can lead to an improvement in the efficiency.

Die Erfindung wird beispielhaft anhand der Zeichnungen näher erläutert. Gleiche Bezugszeichen haben in den verschiedenen Figuren die gleiche Bedeutung. Es zeigen, teilweise schematisch und nicht maßstäblich:The invention will be explained in more detail by way of example with reference to the drawings. Like reference numerals have the same meaning in the various figures. They show, partly schematic and not to scale:

Figur 1 eine perspektivische Ansicht eines Teils einerFigure 1 is a perspective view of a part of a

Turbinenstufe,Turbine stage,

Figur 2 eine weitere perspektivische Ansicht einesFigure 2 is another perspective view of a

Teils einer Turbinenstufe,Part of a turbine stage,

Figur 3 eine Seitenansicht einer Laufschaufel mitFigure 3 is a side view of a blade with

Erosionsschützschild,Erosion Protective Shield,

Figur 4 eine perspektivische Ansicht eines Teils einerFigure 4 is a perspective view of a part of a

Laufschaufel mit Schaufelfuß,Blade with blade root,

Figur 5 eine Seitenansicht des Erosionsschutzschildes.Figure 5 is a side view of the erosion protection shield.

In der Figur 1 ist eine perspektivische Ansicht eines Teils einer Turbinenstufe 1 zu sehen. Die Turbinenstufe 1 umfasst mehrere Laufschaufeln 2, die um eine gemeinsame in Figur 1 nicht näher dargestellte Rotationsachse in einem Rotor 3 angeordnet sind. Im Betrieb rotieren die Laufschaufeln 2 mit einer Umdrehungsgeschwindigkeit von bis zu 3600 Umdrehungen pro Minute. Die Laufschaufei 2 weist ein Schaufelblatt 4 sowie einen Schaufelfuß 5 auf. Das Schaufelblatt 4 ist profiliert und weist eine Saugseite und eine in Figur 1 nicht sichtbare Druckseite 7 auf. Des Weiteren weist die Laufschaufel 2 eine in der Figur 1 nicht sichtbare Anströmkante 8 und eine Abströmkante 9 auf. Der Schaufelfuß 5 wird über eine Lavall-, Reiter-, Steck-, Hammer-, Sägezahn- bzw. Tannenbaum- fuß an den Rotor 3 gehalten. In der Figur 1 und 2 ist ein Tannenbaumfuß beispielhaft dargestellt.FIG. 1 shows a perspective view of a part of a turbine stage 1. The turbine stage 1 comprises a plurality of rotor blades 2, which are arranged around a common rotational axis not shown in detail in FIG. 1 in a rotor 3. In operation, the blades 2 rotate at a speed of up to 3600 revolutions per minute. The rotor blade 2 has an airfoil 4 and a blade root 5. The blade 4 is profiled and has a suction side and not in Figure 1 visible pressure side 7. Furthermore, the blade 2 has a leading edge 8 not visible in FIG. 1 and a trailing edge 9. The blade root 5 is held on the rotor 3 via a lavall, rider, plug, hammer, sawtooth or pine tree foot. In Figures 1 and 2, a Christmas tree foot is exemplified.

An der Laufschaufel 2 ist am Schaufelfuß 5 ein Erosionsschutzschild 10 angeordnet. Das Erosionsschutzschild 10 ist aus einem erosionsbeständigen Material wie z.B. Stellit,On the blade 2, an erosion protection shield 10 is arranged on the blade root 5. The erosion protection shield 10 is made of an erosion resistant material, such as e.g. stellite,

Ultimet, α- oder ß-Titan oder gehärtetem Stahl ausgebildet, wobei das Erosionsschutzschild 10 zum Verhindern von Tropfenschlagerosion vor der Abströmkante 9 angeordnet ist.Ultimet, α- or ß-titanium or hardened steel formed, the erosion protection shield 10 is arranged to prevent drop impact erosion in front of the trailing edge 9.

Die Laufschaufel 2 ist entlang einer Längsausrichtung 11 ausgebildet, wobei ebenso das Erosionsschutzschild 10 entlang dieser Längsausrichtung 11 ausgerichtet ist. Die Längsausrichtung 11 ist im Wesentlichen identisch zur radialen Richtung, die senkrecht zur nicht näher dargestellten Rotations- achse ist.The blade 2 is formed along a longitudinal orientation 11, wherein also the erosion protection shield 10 is aligned along this longitudinal direction 11. The longitudinal alignment 11 is substantially identical to the radial direction, which is perpendicular to the rotation axis, not shown.

Das Erosionsschutzschild 10 ist mit einem Abstand d zur Abströmkante 9 beabstandet. Der Abstand d ist hierbei derart gewählt, dass es zu geringen Strömungsverlusten in der Turbi- nenstufe 1 führt.The erosion protection shield 10 is spaced at a distance d from the outflow edge 9. The distance d is in this case selected such that it leads to low flow losses in the turbine stage 1.

Die Laufschaufel 2 weist eine Länge L auf. Das Erosionsschutzschild 10 weist hierbei eine Länge von 1% bis 100% der Länge L auf.The blade 2 has a length L. The erosion protection shield 10 in this case has a length of 1% to 100% of the length L.

Das Schaufelblatt 4 weist eine Sehnenlänge S auf, wobei das Erosionsschutzschild 10 eine Breite B von 5% bis 75% der Sehnenlänge S aufweist.The airfoil 4 has a chord length S, wherein the erosion protection shield 10 has a width B of 5% to 75% of the chord length S.

Das Erosionsschutzschild 10 wird kraftschlüssig mit demThe erosion protection shield 10 is frictionally with the

Schaufelfuß 5 verbunden. Dazu weist der Schaufelfuß 5 eine schwalbenschwanzfußähnliche Ausnehmung 12 auf, in die das Erosionsschutzschild 10, das einen Schwalbenschwanzfuß 13 aufweist, eingefügt werden kann.Blade foot 5 connected. For this purpose, the blade root 5 a dovetail foot-like recess 12, in which the Erosion protection shield 10, which has a dovetail foot 13, can be inserted.

In alternativen Ausführungsformen ist das Erosionsschutz- schild 10 Stoffschlüssig oder formschlüssig mit dem Schaufelfuß 5 verbunden.In alternative embodiments, the erosion protection shield 10 is connected to the blade root 5 in a cohesive or form-fitting manner.

Wie in den Figuren 1, 2 und 4 zu sehen ist, ist das Erosionsschutzschild 10 vor der Saugseite 6 des Schaufelblattes 4 an- geordnet. Der Schwalbenschwanzfuß 13 ist gerade ausgebildet. In alternativen Ausführungsformen kann der Schwalbenschwanzfuß 13 gebogen ausgeführt sein, was in Figur 4 nicht dargestellt ist. In Figur 4 ist die Ausnehmung 12 für den Schwalbenschwanzfuß 13 gerade ausgebildet und ist im Wesentlichen nahezu parallel zur Saugseite 6 an der Abströmkante 9 gerichtet.As can be seen in FIGS. 1, 2 and 4, the erosion protection shield 10 is arranged in front of the suction side 6 of the airfoil 4. The dovetail 13 is straight. In alternative embodiments, the dovetail 13 may be executed bent, which is not shown in Figure 4. In Figure 4, the recess 12 is formed straight for the dovetail 13 and is directed substantially parallel to the suction side 6 at the trailing edge 9 substantially.

Das Erosionsschutzschild 10 und die Laufschaufel 2 können in einer alternativen Ausführungsform aus einem einzigen integ- ralen Bauteil ausgebildet werden. Dies kann durch Präzisions- Fertigschmieden, Feingießen, Envelope-Schmieden mit nachfolgender Fräsbearbeitung, Fräsen, Erodieren oder anderen bekannten Verfahren durchgeführt werden.The erosion protection shield 10 and the blade 2 can be formed in a alternative embodiment of a single integral component. This can be done by precision finish forging, investment casting, envelope forging with subsequent milling, milling, eroding or other known methods.

In der Figur 2 ist eine perspektivische Ansicht eines Teils einer Turbinenstufe 1 zu sehen. Das Erosionsschutzschild 10 ist im eingebauten Zustand dargestellt.FIG. 2 shows a perspective view of a part of a turbine stage 1. The erosion protection shield 10 is shown in the installed state.

In der Figur 3 ist eine Seitenansicht der Turbinenstufe 1 zu sehen. Das Erosionsschutzschild 10 weist eine Vorderkante 14 und eine Hinterkante 15 auf. Das Erosionsschutzschild 10 ist hierbei derart auf dem Schaufelfuß 5 angeordnet, dass die Hinterkante 15 über die Abströmkante 9 ragt.FIG. 3 shows a side view of the turbine stage 1. The erosion protection shield 10 has a front edge 14 and a trailing edge 15. The erosion protection shield 10 is in this case arranged on the blade root 5 such that the trailing edge 15 protrudes beyond the trailing edge 9.

Die Figur 5 zeigt eine Seitenansicht des Erosionsschutzschildes 10. Das Erosionsschutzschild 10 ist im Querschnitt gesehen in Längsausrichtung 11 mit einem rechtwinkligen oder einem dreieckigen Profil ausgebildet. In einer alternativen Ausführungsform weist das Erosionsschutzschild 10 eine Turbi- nenprofilierung mit Saug- und Druckseite auf, was in der Figur 5 nicht dargestellt ist. Das Erosionsschutzschild 10 kann um die Längsausrichtung 11 gebogen ausgeführt sein, was zu einem gebogenen Schwalbenschwanzfuß 13 führt, der in einer gebogenen Ausnehmung 12 angeordnet sind.FIG. 5 shows a side view of the erosion protection shield 10. The erosion protection shield 10 is formed in longitudinal direction 11 with a rectangular or triangular profile when viewed in cross-section. In an alternative Embodiment, the erosion protection shield 10 a turbine profiling with suction and pressure side, which is not shown in Figure 5. The erosion protection shield 10 can be designed bent around the longitudinal alignment 11, which leads to a bent dovetail foot 13, which are arranged in a curved recess 12.

Die Hinterkante 15 des Erosionsschutzschildes 10 ragt um einen Abstand 1 über die Abströmkante 9 hinaus.The trailing edge 15 of the erosion protection shield 10 protrudes beyond the trailing edge 9 by a distance 1.

Das Erosionsschutzschild 10 kann in einer alternativen Ausführungsform direkt am Rotor 3 angeordnet werden, was in den Figuren 1 bis 5 nicht dargestellt ist.The erosion protection shield 10 can be arranged directly on the rotor 3 in an alternative embodiment, which is not shown in the figures 1 to 5.

Das Erosionsschutzschild 10 kann in einer alternativen Ausführungsform mit Stützflügeln ausgestattet sein. Die Stützflügel sind derart ausgebildet, dass sie sich am Schaufelprofil abstützen. Dadurch erhöht sich der Einsatzbereich des Erosionsschutzschildes 10. Die Stützflügel sind in den Figu- ren nicht näher dargestellt. The erosion protection shield 10 may be provided with support wings in an alternative embodiment. The support wings are designed such that they bear against the blade profile. This increases the range of application of erosion protection shield 10. The support wings are not shown in more detail in the figures.

Claims

Patentansprüche claims 1. Laufschaufei (2) umfassend ein Schaufelblatt (4) und einen Schaufelfuß (5), wobei das Schaufelblatt (4) eine Saugseite (6) und eine Druckseite (7) sowie eine Anström- (8) und Abströmkante (9] aufweist, wobei ein Erosionsschutzschild (10) zum Verhindern von Tropfenschlagerosion vor der Abströmkante (9) angeordnet ist, dadurch gekennzeichnet, dass das Erosionsschutzschild (10) zur Abströmkante (9) beabstandet ist.A rotor (2) comprising an airfoil (4) and a blade root (5), the airfoil (4) having a suction side (6) and a pressure side (7) and an inflow (8) and trailing edge (9), wherein an erosion protection shield (10) for preventing drop impact erosion is arranged in front of the trailing edge (9), characterized in that the erosion protection shield (10) is spaced from the trailing edge (9). 2. Laufschaufei (2) nach Anspruch 1, wobei das Erosionsschutzschild (10) entlang der Längsausrichtung (11) des Schaufelblattes (4) ausgerichtet ist.2. rotor (2) according to claim 1, wherein the erosion protection shield (10) along the longitudinal direction (11) of the airfoil (4) is aligned. 3. Laufschaufei (2) nach einem der vorherigen Ansprüche, wobei die Laufschaufel (2) eine Länge (L) aufweist und das Erosionsschutzschild (10) eine Länge von 1% bis 100% der Länge (L) aufweist.3. rotor (2) according to any one of the preceding claims, wherein the blade (2) has a length (L) and the erosion protection shield (10) has a length of 1% to 100% of the length (L). 4. Laufschaufei (2) nach einem der vorherigen Ansprüche, wobei das Schaufelblatt (4) eine Sehnenlänge (S) aufweist und das Erosionsschutzschild (10) eine Breite (b) von 5% bis 75% der Sehnenlänge (S) aufweist.4. rotor (2) according to one of the preceding claims, wherein the airfoil (4) has a chord length (S) and the erosion protection shield (10) has a width (b) of 5% to 75% of the chord length (S). 5. Laufschaufei (2) nach einem der vorherigen Ansprüche wobei das Erosionsschutzschild (10) vor der Saugseite (6) angeordnet ist.5. rotor (2) according to one of the preceding claims wherein the erosion protection shield (10) in front of the suction side (6) is arranged. 6. Laufschaufel (2) nach einem der vorherigen Ansprüche, wobei das Erosionsschutzschild (10) kraftschlüssig mit dem Schaufelfuß (5) verbunden ist. 6. blade (2) according to one of the preceding claims, wherein the erosion protection shield (10) non-positively connected to the blade root (5). 7. Laufschaufei (2) nach einem der Ansprüche 1 bis 5, wobei das Erosionsschutzschild (10) Stoffschlüssig mit dem Schaufelfuß (5) verbunden ist.7. rotor blade (2) according to one of claims 1 to 5, wherein the erosion protection shield (10) is materially connected to the blade root (5). 8. Laufschaufei (2) nach einem der Ansprüche 1 bis 5, wobei das Erosionsschutzschild (10) formschlüssig mit dem Schaufelfuß (5) verbunden ist.8. rotor (2) according to one of claims 1 to 5, wherein the erosion protection shield (10) is positively connected to the blade root (5). 9. Laufschaufel (2) nach einem der vorherigen Ansprüche, wobei das Erosionsschutzschild (10) und die Laufschaufel9. blade (2) according to any one of the preceding claims, wherein the erosion protection shield (10) and the blade (2) als ein einziges integrales Bauteil ausgebildet ist.(2) is formed as a single integral component. 10. Laufschaufei (2) nach einem der vorherigen Ansprüche, wobei das Erosionsschutzschild (10) eine Hinterkante (15) und eine Vorderkante (14) aufweist und die Hinterkante (15) über die Abströmkante (9) ragt.10. rotor (2) according to one of the preceding claims, wherein the erosion protection shield (10) has a trailing edge (15) and a front edge (14) and the trailing edge (15) via the trailing edge (9) protrudes. 11. Laufschaufei (2) nach einem der vorherigen Ansprüche, wobei das Erosionsschutzschild (10) im Querschnitt in Längsausrichtung (11) gesehen, ein rechtwinkliges oder dreieckiges Profil aufweist.11. rotor (2) according to one of the preceding claims, wherein the erosion protection shield (10) seen in cross-section in the longitudinal direction (11) has a rectangular or triangular profile. 12. Laufschaufei (2) nach einem der vorherigen Ansprüche, wobei das Erosionsschutzschild (10) eine Turbinenprofilie- rung mit Saug- und Druckseite aufweist.12. rotor (2) according to one of the preceding claims, wherein the erosion protection shield (10) has a turbine Profilie- tion with suction and pressure side. 13. Laufschaufei (2) nach einem der Ansprüche 1 bis 11, wobei das Erosionsschutzschild (10) aus einem erosionsbeständiges Material, wie z.B. Stellit, Ultimet, α- oder ß- Titan oder gehärtetem Stahl, ausgebildet ist.A rotor (2) according to any one of claims 1 to 11, wherein the erosion protection shield (10) is made of an erosion-resistant material, e.g. Stellite, Ultimet, α- or ß-titanium or hardened steel is formed. 14. Laufschaufei (2) nach einem der vorherigen Ansprüche, wobei das Erosionsschutzschild (10) einen Schwalbenschwanzfuß (13) aufweist und der Schaufelfuß (5) zum Aufnehmen der Schwalbenschwanzfußes (13) ausgebildet ist. 14. The rotor (2) according to claim 1, wherein the erosion protection shield (10) has a dovetail foot (13) and the blade root (5) is designed to receive the dovetail foot (13). 15. Laufschaufei (2) nach einem der vorherigen Ansprüche, wobei das Erosionsschutzschild (10) gebogen um die Längsausrichtung (11) ausgebildet ist.15. rotor (2) according to one of the preceding claims, wherein the erosion protection shield (10) bent around the longitudinal alignment (11) is formed. 16. Laufschaufei (2) nach einem der vorherigen Ansprüche, wobei das Erosionsschutzschild (10) Stützflügel zum Abstützen an der Laufschaufei (2) aufweist.16. rotor (2) according to one of the preceding claims, wherein the erosion protection shield (10) supporting wings for supporting on the rotor blade (2). 17. Rotor für eine Strömungsmaschine, wobei der Rotor mehrere Laufschaufeln (2) aufweist, dadurch gekennzeichnet, dass das Erosionsschutzschild (10) direkt am Rotor befestigt ist . 17 rotor for a turbomachine, wherein the rotor has a plurality of blades (2), characterized in that the erosion protection shield (10) is attached directly to the rotor.
EP08864232A 2007-12-20 2008-11-27 Erosion protection shield for rotor blades Not-in-force EP2220342B1 (en)

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EP08864232A EP2220342B1 (en) 2007-12-20 2008-11-27 Erosion protection shield for rotor blades
PL08864232T PL2220342T3 (en) 2007-12-20 2008-11-27 Erosion protection shield for rotor blades

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EP07024843A EP2072757A1 (en) 2007-12-20 2007-12-20 Erosion protection shield for a rotating blade
EP08864232A EP2220342B1 (en) 2007-12-20 2008-11-27 Erosion protection shield for rotor blades
PCT/EP2008/066307 WO2009080439A1 (en) 2007-12-20 2008-11-27 Erosion protection shield for rotor blades

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* Cited by examiner, † Cited by third party
Title
See references of WO2009080439A1 *

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CN101903618B (en) 2015-08-05
WO2009080439A1 (en) 2009-07-02
EP2072757A1 (en) 2009-06-24
JP2011506841A (en) 2011-03-03
JP5064570B2 (en) 2012-10-31
US20100322775A1 (en) 2010-12-23
CN101903618A (en) 2010-12-01
EP2220342B1 (en) 2012-12-26
PL2220342T3 (en) 2013-05-31

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