EP2229506B1 - Magnetic device for damping blade vibrations in turbomachines - Google Patents
Magnetic device for damping blade vibrations in turbomachines Download PDFInfo
- Publication number
- EP2229506B1 EP2229506B1 EP08864578A EP08864578A EP2229506B1 EP 2229506 B1 EP2229506 B1 EP 2229506B1 EP 08864578 A EP08864578 A EP 08864578A EP 08864578 A EP08864578 A EP 08864578A EP 2229506 B1 EP2229506 B1 EP 2229506B1
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- European Patent Office
- Prior art keywords
- magnets
- blade
- magnetic
- magnetic field
- magnet
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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
- F01D5/26—Antivibration means not restricted to blade form or construction or to blade-to-blade connections or to the use of particular materials
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/04—Antivibration arrangements
- F01D25/06—Antivibration arrangements for preventing blade vibration
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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
- 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
- F05D2300/00—Materials; Properties thereof
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/507—Magnetic properties
Definitions
- the invention relates to a turbomachine, in particular a steam turbine, comprising a turbine blade rotatably arranged about an axis of rotation and directed along a blade axis, a housing arranged around the turbine blade, an induction plate arranged in the turbine blade tip and a magnet arranged in the housing.
- turbomachinery 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.
- the energy conversion takes place indirectly and makes its way over the kinetic energy of the flow medium.
- the flow medium flows through fixed vanes, increasing the velocity and thus the kinetic energy of the flow medium at the expense of its pressure.
- the shape of the vanes creates a velocity component in the circumferential direction of the impeller.
- the fluid releases its kinetic energy to the rotor by varying the amount of velocity and the direction as it flows through the channels formed by the blades.
- the impeller is driven by the resulting forces.
- the rotating blades in a turbomachine are designed without resonance for the largest possible operating conditions. If the operating conditions change, eg due to volume flow changes, For example, the blades may be excited to vibrate, which could result in failure of the blades when vibration resonances result in excessive mechanical stresses.
- Various devices have been developed to dampen these vibrations. For example, it is known to couple vanes to each other to thereby dampen vibrations.
- the EP 0 727 564 B1 discloses a turbomachine having turbine blades and a housing disposed about the turbine blade, wherein magnets in the housing made of rings are arranged on the circumference of the inner surface of the housing.
- the turbine blades have a conductive material on the tips, which can reduce vibrations as these turbine blades move against the magnet.
- the EP 0 928 738 discloses a flow machine with propeller blades, a housing arranged around this schaul and two induction pins arranged in each chisel tip which in combination with magnets arranged in the housing control the "pitch" of the propeller shafts.
- the vibrations of the blades are undesirable because they can lead to material fatigue of the blade and the rotor claw. Any one thousand point of improved logarithmic attenuation decrement is desirable.
- shroud blades have a total loss of 0.5% log dec. Doubling this size results in halving the resonant amplitudes, which may mean that one mode is less tunable. This also allows the permissible speed range to be widened.
- the vibration damping methods which are caused by magnetic forces, such. B. in the EP 0 727 564 B1 . DE 199 37 146 A1 and the EP 1 596 037 A2 have the disadvantage that the forces generated by eddy currents do not distinguish between a movement of the turbine blade tip in the main movement and a disturbing oscillatory motion.
- a movement of the blade in the direction of rotation, ie in the circumferential direction is influenced by the magnetic forces that lead to eddy currents, which is undesirable.
- a not executed in the circumferential direction of vibrational motion for example in the axial direction to be damped by magnetic forces that lead to eddy currents.
- the invention begins, whose task is to provide a turbomachine that allows effective damping of blade vibrations.
- a turbomachine in particular a steam turbine, comprising a turbine blade rotatably arranged about a rotary ash and arranged along a blade axis, a housing arranged around the turbine blade, an induction plate arranged in the turbine blade tip and a magnet arranged in the housing, wherein the induction plate in a plane formed by the rotation axis and a radial direction is aligned.
- induction plates are arranged in the blade tip.
- Such induction plates are made of a suitable material. Whereby this material is electrically conductive and therefore suitable for causing eddy currents.
- These induction plates are aligned along a plane formed by the axis of rotation and a radial direction. Of course, this plane is not stationary, i. this plane rotates around the axis of rotation.
- the induction plate is optimal for attenuation, d. H. aligned parallel to the axis of rotation and parallel to the radial direction. Since the radial direction is changed over time in operation, i.
- the induction plate is always aligned perpendicular to the opposite housing.
- a magnet arranged in the housing is aligned in such a way that the magnetic field acts in the direction of the induction plates.
- a movement of the induction plate by this magnetic field causes eddy currents in the induction plate, which leads to a development of a counter magnetic field, which is formed according to the Lenzsch'en rule opposite to the external magnetic field, resulting in a counterforce, which eventually leads to a damping.
- the magnetic north pole and the magnetic south pole of the magnet lies on a circular path, wherein the circular path is rotationally symmetrical about the axis of rotation. Since turbomachines usually have a high degree of symmetry, it is necessary for the applied magnetic field to be based, so to speak, on the existing symmetry. A magnetic field not oriented along the circular path would lead to undesirable side effects. For example, a desired blade movement could be slowed down.
- the magnetic field can be generated by a permanent magnet or electrically.
- the electrically generated magnetic field may advantageously be achieved by an axisymmetric coil having a field orthogonal to the plates.
- the circular path runs along an inner peripheral surface of the housing.
- the magnetic field is further homogenized or formed symmetrically. This symmetrical magnetic field leads to a targeted damping of unwanted blade vibrations.
- the magnet is in this case advantageously horseshoe-shaped or U-shaped.
- the magnetic field of a magnet is strongly dependent on its geometric shape.
- the magnetic field of a bar magnet is different than the magnetic field of a horseshoe-shaped magnet.
- the magnetic field of a bar magnet is inhomogeneous compared to the horseshoe-shaped or U-shaped magnet.
- a plurality of magnets are used, wherein the magnets are arranged in the circumferential direction to a first magnetic circuit row behind the other.
- An eddy current only occurs when the movement of the induction plate is perpendicular to an external magnetic field.
- a movement of the induction plate in parallel to an external magnetic field does not lead to eddy currents and thus not to a damping of the blade vibration.
- a single magnet naturally has a more or less large stray field, which in addition to parallel also has vertical components to the direction of movement of the induction plate. This means that the induction plate moving through this single magnetic field of a single magnet temporarily transits a parallel portion of the magnetic field.
- a number of n magnets in the circumferential direction is provided, wherein n represents a whole positive number, wherein the magnets at a regular distance from u n are arranged one behind the other, where u represents the circumference of the inner peripheral surface.
- n represents a whole positive number
- the magnets at a regular distance from u n are arranged one behind the other, where u represents the circumference of the inner peripheral surface.
- a second magnetic circuit series comprising a plurality of circumferentially arranged Magnets provided, wherein the second magnetic circuit row is arranged in the axial direction in front of the first magnetic circuit row.
- n magnets are provided in the second magnetic circuit row, wherein the magnets are spaced at a regular distance from u n arranged one behind the other.
- the magnets of the second magnetic circuit row are arranged offset to one another with respect to the magnets of the first magnetic circuit row. This leads to a homogenization of the magnetic field along the circumferential direction in the housing of the turbomachine. Movement of the induction plate in the main direction is not affected thereby, whereas movements of the induction plate are damped transversely to the main direction.
- the invention has, inter alia, the advantage that no rubbing parts are needed to dampen vibrations.
- a connection is established between the individual blades, which inevitably leads to a friction in the connecting pieces, which lead to wear.
- Another advantage of the invention is that it is applicable to titanium blades.
- the device according to the invention is very effective, whereby high attenuation values can be achieved.
- the FIG. 1 shows a blade 1.
- This blade 1 may be a turbine blade or a compressor blade.
- the blade 1 is arranged on a rotor, not shown.
- the arrangement of rotor and blade 1 is a in FIG. 1 not shown rotation axis 23 rotatably mounted. In operation, a rotation about this axis of rotation 23 is carried out at a rotational frequency ⁇ .
- the main movement of the blade 1 runs along the rotor circulation.
- One of these major movements superimposed and unwanted movement is the vibration of the blade 1.
- These disturbing vibrations can be damped by means of eddy currents.
- the arrangement of the induction plates 3 and the magnetic field lead to the fact that no main braking force components arise because they brake the engine.
- the blade 1 has a shroud 2, in which induction plates 3 are arranged.
- the shroud 2 is arranged on an airfoil 4.
- the rotor with the blades 1 is rotatably mounted in a turbomachine, which is not shown.
- a housing is arranged around the rotor and the blades 1, a housing is arranged.
- the housing has a magnet 5.
- the induction plate 3 is hereby aligned in a plane which is formed by the rotation axis 23 and a radial direction. This radial direction is in the FIG. 1 represented by a blade axis 7. In operation, this blade axis 7 rotates at the rotational frequency ⁇ about the axis of rotation 23.
- FIG. 2 shows a single induction plate 3 and its arrangement to the magnetic field B of the magnet 5. For clarity, only the magnetic north pole N and the magnetic south pole S of the magnet 5 in the FIG. 2 shown.
- the induction plate 3 carries out a desired movement V red in the circumferential direction 17 and a disturbing movement V vib in the axial direction 6.
- a Lorenz force acts in proportion to the speed, since the magnetic field B is perpendicular to the induction plate 3.
- This Lorenz force leads to a Eddy current, which counteracts the movement of the induction plate 3, whereby the vibration of the induction plate 3 is braked.
- the main movement does not lead to significant eddy currents, since the induction plate 3 is movable in the direction of movement and thus does not oppose the flow of current. As a result, there is no significant Lorenz force that could slow down the main movement.
- FIG. 3 is a view of the shroud 2 with a single induction plate 3 shown.
- the shroud 2 has recesses which are designed to couple neighboring shrouds 2, so to speak.
- the induction plates 3 are in this case formed of an electrically conductive material and incorporated into the shroud 2.
- the shroud 2 and an upper edge 8 of the induction plate 3 is planar with a surface 9 of the shroud, which in the FIG. 4 which has a side view towards A FIG. 3 represents, can be seen.
- the induction plates 3 are advantageously electrically isolated from each other.
- FIG. 4 a plurality of induction plates 3 are shown. An increase in the number of induction plates 3 leads to an increase in the effect of eddy current development.
- FIG. 5 shows a plan view of the shroud 2 seen in the direction of the blade axis 7.
- the blade axis 7 is thus perpendicular to the plane of the drawing.
- the arrows 10, 11, 12 represent possible undesired vibration directions 10, 11, 12. All of these vibration directions 10, 11, 12 have a component which points in the axial direction 6. The vibrations occurring in this axial direction 6 are decelerated by eddy current effects.
- the magnet 5 is, as in FIG. 8 represented horseshoe-shaped or U-shaped.
- the magnet 5 has for this purpose a long edge 13 and two short edges 14 and 15.
- the short edge 14 is bent by approximately an angle ⁇ of 120 ° with respect to the long edge 13.
- the short edge 15 is bent by the angle ⁇ of approximately 120 ° with respect to the long edge 13.
- the angle ⁇ may have a value range between 90 ° and 160 ° in alternative embodiments of the magnet 5.
- the short edge 14 is designed as a magnetic north pole and the short edge 15 as a magnetic south pole. Between the magnetic north pole N and the south magnetic pole S, a magnetic field B is formed, which for physical reasons on the shortest distance between the magnetic north pole and the magnetic south pole S has a homogeneous distribution.
- the magnetic field B becomes inhomogeneous.
- the inhomogeneity of the magnetic field B in the radial direction and thus also in a circumferential direction 17 is eliminated by arranging a plurality of magnets 5 in the circumferential direction 17 on the housing.
- the magnetic field B is thereby homogeneous in the circumferential direction 17.
- FIG. 9 the magnetic field B of a magnet 5, not shown, is shown.
- the FIG. 9 shows in the axial direction 6 seen the magnetic field B in the region of the shroud 2. It can be clearly seen that the field line from the magnetic north pole to the south magnetic pole assumes a circular orbit-like shape. The shrouds 2 move in the circumferential direction 17 through this magnetic field B.
- the selected black and white representation of the magnetic field is symbolized by white a strong magnetic field and black or dark a weak magnetic field.
- FIG. 10 the magnetic field B of a magnet 5 offset in the circumferential direction 17 is shown.
- the magnetic field lines are formed like a circle.
- a magnetic field B can be seen, which can be seen by a superimposition of several magnetic fields of the individual magnets 5. It can be clearly seen that especially at a certain height, which is marked at -1, for example, the magnetic field in the circumferential direction 17, which is represented by the X-axis, is unambiguously homogeneous. Accordingly, an induction plate moved in this X direction does not experience a disturbing magnetic deflection force in the form of the Lorenz force because the magnetic fields and the direction of movement are parallel to each other.
- the Y-axis in the FIGS. 9, 10 and 11 give a spatial arrangement again.
- the top edge of the FIGS. 9, 10 and 11 symbolize the housing.
- the Y-axis points in the direction of the blade axis 7, which points in the radial direction 16.
- the magnets 5 are designed as permanent magnets or as electrically controlled magnets.
- the magnets 5 are arranged one behind the other in the circumferential direction 17, which leads to a first series of magnetic circuits 18.
- a number of n magnets 5 in the circumferential direction 17 are provided, wherein an n represents a positive integer.
- the magnets 5 are at a regular distance from u n arranged one behind the other, where u represents the circumference of the inner peripheral surface.
- a second magnetic circuit row 19 comprising a plurality of magnets 5 is arranged.
- the second magnetic circuit row 19 comprises a plurality of circumferentially arranged 17 magnets 5 in a row.
- the second magnetic circuit row 19 has at a regular distance from u n consecutively arranged magnets 5.
- another third magnetic circuit row 20 are arranged in the axial direction 6 behind the second magnetic circuit row 19.
- This third series of magnetic circuits 20 also includes a plurality of magnets 5 arranged at a regular distance from each other u n arranged one behind the other.
- the second magnetic circuit row 19 is arranged offset from the first magnetic circuit row 18.
- the third magnetic circuit row 20 is in turn offset against the second magnetic circuit row 19.
- the displacement of the third magnetic circuit row 20 relative to the second magnetic circuit row 19 and the displacement of the second magnetic circuit row 19 relative to the first magnetic circuit row 18 should be equidistant.
- the offset 21 may be an entire long edge 13.
- the offset 21 may be half a long edge 13.
- the offset may be one quarter of the long edge 13.
- the distance 22 results inevitably from the size of the magnet 5, in particular the long edge 13 and the number n of magnets and the circumference u, since the magnets 5 at equidistant intervals 22 to one another Magnetic circuit row 18, 19, 20 are arranged.
- FIG. 6 is a view in the axial direction 6 on the blade 1 and the magnets 5 can be seen.
- the axial direction 6 is perpendicular to the plane of the drawing.
- the blades 1 rotate about the axis of rotation 23.
- the arrangement of the magnets 5 corresponds to the arrangement according to FIG. 7 , The arrangement of the magnets in FIG. 6 is shown only symbolically.
- the magnets 5 are arranged around the entire inner surface of the housing. Of course, the north magnetic poles N and the south magnetic poles S of the individual magnets 5 on a circular path 24, wherein the circular path 24 is rotationally symmetrical about the axis of rotation 23 is directed.
- the circular path 24 extends along an inner peripheral surface of the housing.
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Abstract
Description
Die Erfindung betrifft eine Strömungsmaschine, insbesondere eine Dampfturbine, umfassend eine um eine Rotationsachse drehbar angeordnete und entlang einer Schaufelachse gerichtete Turbinenschaufel, ein um die Turbinenschaufel angeordnetes Gehäuse, eine in der Turbinenschaufelspitze angeordnete Induktionsplatte und einen im Gehäuse angeordneten Magneten.The invention relates to a turbomachine, in particular a steam turbine, comprising a turbine blade rotatably arranged about an axis of rotation and directed along a blade axis, a housing arranged around the turbine blade, an induction plate arranged in the turbine blade tip and a magnet arranged in the housing.
Unter der Sammelbezeichnung Strömungsmaschinen werden Wasserturbinen, Dampf- und Gasturbinen, Windräder, Kreiselpumpen und Kreiselverdichter sowie Propeller 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.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 Strömungsmaschine erfolgt die Energieumsetzung indirekt und nimmt den Weg über die kinetische Energie des Strömungsmediums. In einer Turbine beispielsweise strömt das Strömungsmedium durch feststehende Leitschaufeln, wobei sich die Geschwindigkeit und damit die kinetische Energie des Strömungsmediums auf Kosten seines Drucks erhöht. Durch die Form der Leitschaufeln entsteht eine Geschwindigkeitskomponente in der Umfangsrichtung des Laufrades. Das Fluid bzw. Strömungsmedium gibt seine kinetische Energie an den Rotor ab, indem der Betrag der Geschwindigkeit und die Richtung beim Durchströmen der von den Laufschaufeln gebildeten Kanälen verändert wird. Das Laufrad wird durch die dabei entstehenden Kräfte angetrieben.In a turbomachine, the energy conversion takes place indirectly and makes its way over the kinetic energy of the flow medium. In a turbine, for example, the flow medium flows through fixed vanes, increasing the velocity and thus the kinetic energy of the flow medium at the expense of its pressure. The shape of the vanes creates a velocity component in the circumferential direction of the impeller. The fluid releases its kinetic energy to the rotor by varying the amount of velocity and the direction as it flows through the channels formed by the blades. The impeller is driven by the resulting forces.
Die rotierenden Schaufeln in einer Strömungsmaschine sind für möglichst große Betriebsbedingungen resonanzfrei ausgelegt. Wenn sich die Betriebsbedingungen ändern, z.B. durch Volumenstromänderungen, können die Schaufeln zu Schwingungen angeregt werden, was zu einem Versagen der Schaufeln führen könnte, wenn Schwingungsresonanzen zu zu hohen mechanischen Beanspruchungen führen. Es sind verschiedene Einrichtungen entwickelt worden, um diese Schwingungen zu dämpfen. Beispielsweise ist es bekannt, Schaufeln einander zu koppeln, um dadurch Schwingungen zu dämpfen.The rotating blades in a turbomachine are designed without resonance for the largest possible operating conditions. If the operating conditions change, eg due to volume flow changes, For example, the blades may be excited to vibrate, which could result in failure of the blades when vibration resonances result in excessive mechanical stresses. Various devices have been developed to dampen these vibrations. For example, it is known to couple vanes to each other to thereby dampen vibrations.
In der
Die
In der
Die Schwingungen der Schaufeln sind unerwünscht, da sie zu Materialermüdung der Schaufel und der Rotorklaue führen können. Jeder Promillepunkt an verbessertem logarithmischem Dämpfungsdekrement ist erstrebenswert. Deckplattenschaufeln haben beispielsweise eine Gesamtdämpfung von 0,5% log dec. Eine Verdopplung dieser Größe führt rund zu einer Halbierung der Resonanzamplituden, was bedeuten kann, dass eine Mode weniger abzustimmen ist. Auch lässt sich dadurch der zulässige Drehzahlbereich aufweiten.The vibrations of the blades are undesirable because they can lead to material fatigue of the blade and the rotor claw. Any one thousand point of improved logarithmic attenuation decrement is desirable. For example, shroud blades have a total loss of 0.5% log dec. Doubling this size results in halving the resonant amplitudes, which may mean that one mode is less tunable. This also allows the permissible speed range to be widened.
Die zur Verfügung stehenden Maßnahmen zur Dämpfung der Schwingungen haben den Nachteil, dass sie vergleichsweise viel Bauraum benötigen. Dieser Bauraum steht allerdings in der Regel nicht zur Verfügung. Ein weiterer einschränkender Faktor sind die hohen Fliehkräfte, die in Strömungsmaschinen vorkommen .The available measures for damping the vibrations have the disadvantage that they are comparatively need a lot of space. However, this space is usually not available. Another limiting factor is the high centrifugal forces that occur in turbomachinery.
Die Schwingungsdämpfungsmethoden, die durch magnetische Kräfte hervorgerufen werden, wie z. B. in der
Wünschenswert wäre es eine Vorrichtung zu haben, die Schwingungen einer Schaufel dämpft, wobei die Vorrichtung keinen Einfluss auf die Bewegung der Schaufel in der Hauptrichtung, d.h. in der Umfangsrichtung hat.It would be desirable to have a device which dampens vibrations of a blade, the device having no influence on the movement of the blade in the main direction, i. in the circumferential direction.
An dieser Stelle setzt die Erfindung an, deren Aufgabe es ist, eine Strömungsmaschine anzugeben, die eine wirksame Dämpfung von Schaufelschwingungen ermöglicht.At this point, the invention begins, whose task is to provide a turbomachine that allows effective damping of blade vibrations.
Diese Aufgabe wird gelöst durch eine Strömungsmaschine, insbesondere einer Dampfturbine, umfassend eine um eine Rotationsasche drehbar angeordnete und entlang einer Schaufelachse gerichtete Turbinenschaufel, ein um die Turbinenschaufel angeordnetes Gehäuse, eine in der Turbinenschaufelspitze angeordnete Induktionsplatte und einen im Gehäuse angeordneten Magneten, wobei die Induktionsplatte in einer Ebene ausgerichtet ist, die durch die Rotationsachse und einer radialen Richtung gebildet ist.This object is achieved by a turbomachine, in particular a steam turbine, comprising a turbine blade rotatably arranged about a rotary ash and arranged along a blade axis, a housing arranged around the turbine blade, an induction plate arranged in the turbine blade tip and a magnet arranged in the housing, wherein the induction plate in a plane formed by the rotation axis and a radial direction is aligned.
Ein wesentliches Merkmal der Erfindung ist es, dass sogenannte Induktionsplatten in der Schaufelspitze angeordnet sind. Solche Induktionsplatten sind aus einem geeigneten Material. Wobei dieses Material elektrisch leitfähig und daher geeignet ist, um Wirbelströme entstehen zu lassen. Diese Induktionsplatten werden entlang einer Ebene ausgerichtet, die durch die Rotationsachse und einer radialen Richtung gebildet ist. Diese Ebene ist selbstverständlich nicht stationär, d.h. diese Ebene rotiert um die Rotationsachse. Die Induktionsplatte ist dämpfungsoptimal, d. h. parallel zur Rotationsachse und parallel zur radialen Richtung ausgerichtet. Da die radiale Richtung im Betrieb zeitlich verändert wird, d.h. mit der Rotationsfrequenz um die Rotationsachse dreht, ist die Induktionsplatte immer senkrecht zum gegenüberliegenden Gehäuse ausgerichtet. Ein im Gehäuse angeordneter Magnet ist derart ausgerichtet, dass das Magnetfeld in Richtung der Induktionsplatten wirkt. Eine Bewegung der Induktionsplatte durch dieses Magnetfeld ruft Wirbelströme in der Induktionsplatte hervor, die zu einer Entwicklung von einem Gegenmagnetfeld führt, was gemäß der Lenzsch'en Regel entgegengesetzt dem äußeren Magnetfeld ausgebildet ist, was zu einer Gegenkraft führt, die schließlich zu einer Dämpfung führt.An essential feature of the invention is that so-called induction plates are arranged in the blade tip. Such induction plates are made of a suitable material. Whereby this material is electrically conductive and therefore suitable for causing eddy currents. These induction plates are aligned along a plane formed by the axis of rotation and a radial direction. Of course, this plane is not stationary, i. this plane rotates around the axis of rotation. The induction plate is optimal for attenuation, d. H. aligned parallel to the axis of rotation and parallel to the radial direction. Since the radial direction is changed over time in operation, i. rotates at the rotational frequency about the axis of rotation, the induction plate is always aligned perpendicular to the opposite housing. A magnet arranged in the housing is aligned in such a way that the magnetic field acts in the direction of the induction plates. A movement of the induction plate by this magnetic field causes eddy currents in the induction plate, which leads to a development of a counter magnetic field, which is formed according to the Lenzsch'en rule opposite to the external magnetic field, resulting in a counterforce, which eventually leads to a damping.
Weitere vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.Further advantageous developments are specified in the subclaims.
So ist es vorteilhaft, dass der magnetische Nordpol und der magnetische Südpol des Magneten auf einer Kreisbahn liegt, wobei die Kreisbahn rotationssymmetrisch um die Rotationsachse gerichtet ist. Da Strömungsmaschinen in der Regel einen hohen Grad an Symmetrie aufweisen, ist es erforderlich, dass das anliegende Magnetfeld sich quasi an der vorhandenen Symmetrie orientiert. Ein nicht entlang der Kreisbahn orientiertes Magnetfeld würde zu unerwünschten Nebeneffekten führen. Beispielsweise könnte eine erwünschte Schaufelbewegung abgebremst werden.So it is advantageous that the magnetic north pole and the magnetic south pole of the magnet lies on a circular path, wherein the circular path is rotationally symmetrical about the axis of rotation. Since turbomachines usually have a high degree of symmetry, it is necessary for the applied magnetic field to be based, so to speak, on the existing symmetry. A magnetic field not oriented along the circular path would lead to undesirable side effects. For example, a desired blade movement could be slowed down.
Das magnetische Feld kann durch einen Permanentmagneten oder elektrisch erzeugt werden. Das elektrisch erzeugte Magnetfeld kann vorteilhafterweise durch eine axialsymmetrische Spule mit einem Feld erreicht werden, das orthogonal zu den Platten angeordnet ist.The magnetic field can be generated by a permanent magnet or electrically. The electrically generated magnetic field may advantageously be achieved by an axisymmetric coil having a field orthogonal to the plates.
Vorteilhafterweise verläuft die Kreisbahn entlang einer innen liegenden Umfangsfläche des Gehäuses. Durch diese Maßnahme wird das Magnetfeld weiter homogenisiert bzw. symmetrisch ausgebildet. Dieses symmetrisch ausgebildete Magnetfeld führt zu einer gezielten Dämpfung von unerwünschten Schaufelschwingungen.Advantageously, the circular path runs along an inner peripheral surface of the housing. By this measure, the magnetic field is further homogenized or formed symmetrically. This symmetrical magnetic field leads to a targeted damping of unwanted blade vibrations.
Der Magnet ist hierbei vorteilhafterweise hufeisenförmig bzw. U-förmig ausgebildet. Das magnetische Feld eines Magneten ist stark von seiner geometrischen Form abhängig. So ist das Magnetfeld eines Stabmagneten anders als das Magnetfeld eines hufeisenförmigen Magneten. Das Magnetfeld eines Stabmagneten ist im Vergleich zum hufeisenförmigen bzw. U-förmigen Magnet inhomogener. Eine Anordnung des hufeisenförmigen bzw. U-förmigen Magneten am Gehäuse, wobei die Schenkel der Gehäuse auf einer Kreisbahn angeordnet sind, führt zu einem relativ homogenen Feld, durch das die Induktionsplatte bewegt wird.The magnet is in this case advantageously horseshoe-shaped or U-shaped. The magnetic field of a magnet is strongly dependent on its geometric shape. Thus, the magnetic field of a bar magnet is different than the magnetic field of a horseshoe-shaped magnet. The magnetic field of a bar magnet is inhomogeneous compared to the horseshoe-shaped or U-shaped magnet. An arrangement of the horseshoe-shaped or U-shaped magnet on the housing, wherein the legs of the housing are arranged in a circular path, leads to a relatively homogeneous field through which the induction plate is moved.
In einer weiteren vorteilhaften Weiterbildung werden mehrere Magnete verwendet, wobei die Magnete in Umfangsrichtung gesehen zu einer ersten Magnetenkreisreihe hintereinander angeordnet sind. Ein Wirbelstrom entsteht nur dann, wenn die Bewegung der Induktionsplatte senkrecht zu einem äußeren magnetischen Feld ist. Eine Bewegung der Induktionsplatte parallel zu einem äußeren Magnetfeld führt nicht zu Wirbelströmen und somit nicht zu einer Dämpfung der Schaufelschwingung. Ein einzelner Magnet hat naturgemäß ein mehr oder minder großes Streufeld, das neben parallelen auch senkrechte Komponenten zur Bewegungsrichtung der Induktionsplatte aufweist. Das bedeutet, dass die durch dieses einzelne Magnetfeld eines einzelnen Magneten bewegende Induktionsplatte einen parallelen Anteil des Magnetfeldes temporär durchfliegt. Werden wie in dieser vorteilhaften Weiterbildung vorgeschlagen, mehrere Magnete hintereinander in der Umfangsrichtung angeordnet, so werden die einzelnen, durch die einzelnen Magnete hervorgerufenen, Magnetfelder zu einem gemeinsamen in der Umfangsrichtung ausgebildeten Magnetfeld geordnet. Dieses gemeinsame Magnetfeld führt zu einem nahezu homogenen Feld in der Umfangsrichtung, wobei die Magnetfeldlinien nahezu kreisförmig am Umfang entlang ausgerichtet sind. Eine Bewegung der Induktionsplatte in Umfangsrichtung ist somit parallel zum Magnetfeld ausgerichtet, wodurch keine Wirbelströme erzeugt werden. Eine Bewegung der Induktionsplatte in dieser Richtung führt somit nicht zu störenden Kräften, die durch das Magnetfeld hervorgerufen werden. Es werden nunmehr lediglich diejenigen Bewegungen gebremst, die eine Komponente aufweisen, die quer zu den Magnetfeldlinien gerichtet sind. Solche Bewegungen sind beispielsweise Schwingungen in axialer Richtung. Da diese Schwingungsform eine Komponente aufweist, die senkrecht zu dem Magnetfeld ist, wird diese Schwingung durch das äußere Magnetfeld abgebremst.In a further advantageous embodiment, a plurality of magnets are used, wherein the magnets are arranged in the circumferential direction to a first magnetic circuit row behind the other. An eddy current only occurs when the movement of the induction plate is perpendicular to an external magnetic field. A movement of the induction plate in parallel to an external magnetic field does not lead to eddy currents and thus not to a damping of the blade vibration. A single magnet naturally has a more or less large stray field, which in addition to parallel also has vertical components to the direction of movement of the induction plate. This means that the induction plate moving through this single magnetic field of a single magnet temporarily transits a parallel portion of the magnetic field. Be like in proposed this advantageous development, several magnets arranged one behind the other in the circumferential direction, the individual, caused by the individual magnets, magnetic fields are arranged to a common formed in the circumferential direction magnetic field. This common magnetic field leads to a nearly homogeneous field in the circumferential direction, with the magnetic field lines being aligned in a nearly circular manner along the circumference. A movement of the induction plate in the circumferential direction is thus aligned parallel to the magnetic field, whereby no eddy currents are generated. A movement of the induction plate in this direction thus does not lead to disturbing forces, which are caused by the magnetic field. Now only those movements are braked, which have a component which are directed transversely to the magnetic field lines. Such movements are, for example, vibrations in the axial direction. Since this waveform has a component that is perpendicular to the magnetic field, this vibration is decelerated by the external magnetic field.
In einer weiteren vorteilhaften Weiterbildung ist eine Anzahl von n Magneten in der Umfangsrichtung vorgesehen, wobei n eine ganze positive Zahl darstellt, wobei die Magnete in einem regelmäßigen Abstand von
In einer weiteren vorteilhaften Weiterbildung ist eine zweite Magnetenkreisreihe umfassend mehrere in Umfangsrichtung angeordnete Magnete vorgesehen, wobei die zweite Magnetenkreisreihe in axialer Richtung vor der ersten Magnetenkreisreihe angeordnet ist. Vorteilhafterweise sind in der zweiten Magnetenkreisreihe n Magnete vorgesehen, wobei die Magnete in einem regelmäßigen Abstand von
In einer weiteren vorteilhaften Weiterbildung sind die Magnete der zweiten Magnetenkreisreihe zu den Magneten der ersten Magnetenkreisreihe zueinander versetzt angeordnet. Dies führt zu einer Homogenisierung des Magnetfeldes entlang der Umfangsrichtung im Gehäuse der Strömungsmaschine. Eine Bewegung der Induktionsplatte in der Hauptrichtung wird dadurch nicht beeinflusst, wohingegen Bewegungen der Induktionsplatte quer zur Hauptrichtung gedämpft werden.In a further advantageous development, the magnets of the second magnetic circuit row are arranged offset to one another with respect to the magnets of the first magnetic circuit row. This leads to a homogenization of the magnetic field along the circumferential direction in the housing of the turbomachine. Movement of the induction plate in the main direction is not affected thereby, whereas movements of the induction plate are damped transversely to the main direction.
Die Erfindung weist unter anderem den Vorteil auf, dass keine reibenden Teile benötigt werden, um Schwingungen zu dämpfen. Bei den bekannten Methoden wird meistens eine Verbindung aufgebaut zwischen den einzelnen Schaufeln, was zwangsläufig zu einer Reibung bei den Verbindungsstücken führt, die zu einem Verschleiß führen.The invention has, inter alia, the advantage that no rubbing parts are needed to dampen vibrations. In the known methods usually a connection is established between the individual blades, which inevitably leads to a friction in the connecting pieces, which lead to wear.
Ein weiterer Vorteil der Erfindung ist, dass sie bei Titanschaufeln anwendbar ist. Darüber hinaus ist die erfindungsgemäße Einrichtung sehr effektiv, wobei hohe Dämpfungswerte erreicht werden können.Another advantage of the invention is that it is applicable to titanium blades. In addition, the device according to the invention is very effective, whereby high attenuation values can be achieved.
Die Erfindung wird anhand eines Ausführungsbeispiels näher erläutert. Dabei haben Komponenten mit gleichen Bezugszeichen die gleiche Wirkung.The invention will be explained in more detail with reference to an embodiment. In this case, components with the same reference numerals have the same effect.
Es zeigen:
Figur 1- eine perspektivische Ansicht einer Schaufelspitze mit Anordnung eines Magneten,
Figur 2- eine vergrößerte Darstellung einer Induktionsplatte mit Magnetfeld,
Figur 3- eine perspektivische Ansicht eines Deckbandes mit einer Induktionsplatte,
Figur 4- eine Seitenansicht der Deckplatte aus
Figur 3 mit mehreren Induktionsplatten, Figur 5- eine Draufsicht von oben auf die Deckplatte mit Induktionsplatten,
Figur 6- eine Seitenansicht von mehreren Schaufeln,
Figur 7- eine schematische Ansicht der Anordnung der Mag- nete,
Figur 8- eine schematische Darstellung eines Magneten,
- Figur 9
- Darstellung des Magnetfeldes eines Magneten,
Figur 10- Darstellung eines versetzt angeordneten Magnetfel- des durch einen Magneten,
- Figur 11
- Darstellung des Magnetfeldes durch mehrere erzeugte und zueinander versetzt angeordnete und in Umfangs- richtung verteilte Magnete.
- FIG. 1
- a perspective view of a blade tip with the arrangement of a magnet,
- FIG. 2
- an enlarged view of an induction plate with magnetic field,
- FIG. 3
- a perspective view of a shroud with an induction plate,
- FIG. 4
- a side view of the cover plate
FIG. 3 with several induction plates, - FIG. 5
- a top view from the top of the cover plate with induction plates,
- FIG. 6
- a side view of several blades,
- FIG. 7
- a schematic view of the arrangement of the magnets,
- FIG. 8
- a schematic representation of a magnet,
- FIG. 9
- Representation of the magnetic field of a magnet,
- FIG. 10
- Representation of a staggered magnetic field by a magnet,
- FIG. 11
- Representation of the magnetic field by a plurality of generated and offset from each other and distributed in the circumferential direction magnets.
Die
Die Schaufel 1 weist ein Deckband 2 auf, in dem Induktionsplatten 3 angeordnet sind. Das Deckband 2 ist an einem Schaufelblatt 4 angeordnet. Der Rotor mit den Schaufeln 1 wird in einer Strömungsmaschine, die nicht dargestellt ist, drehbar gelagert. Um den Rotor und den Schaufeln 1 ist ein Gehäuse angeordnet. Das Gehäuse weist einen Magneten 5 auf. In der
Die
Die Induktionsplatte 3 führt eine gewollte Bewegung Vrot in Umfangsrichtung 17 und eine störende Bewegung Vvib in axialer Richtung 6 aus. Durch die Bewegung der Induktionsplatte 3 in axialer Richtung 6 wirkt eine Lorenz-Kraft proportional mit der Geschwindigkeit, da das Magnetfeld B senkrecht zu der Induktionsplatte 3 steht. Diese Lorenz-Kraft führt zu einem Wirbelstrom, der der Bewegung der Induktionsplatte 3 entgegen wirkt, wodurch die Schwingung der Induktionsplatte 3 gebremst wird.The
Die Hauptbewegung führt jedoch nicht auf wesentliche Wirbelströme, da die Induktionsplatte 3 in der Bewegungsrichtung bewegbar ist und damit dem Stromfluss keinen Widerstand entgegensetzt. Dadurch stellt sich keine wesentliche Lorenzkraft ein, die die Hauptbewegung bremsen könnte.However, the main movement does not lead to significant eddy currents, since the
In der
Die Induktionsplatten 3 sind vorteilhafterweise voneinander elektrisch isoliert.The
In der
Die
Es lassen sich Optimierungen bezüglich der Orientierung der Induktionsplatten 3 vornehmen, dergestalt, dass bestimmte Moden vorrangig gedämpft werden. Auch sind Kombinationen von Anordnungen auf eine oder verschiedene Schaufeln 1 im Verbund denkbar.Optimizations can be made with regard to the orientation of the
Der Magnet 5 ist, wie in
In der
In der
In der
Die Y-Achse in den
Die Magnete 5 sind als Permanentmagnete oder als elektrisch gesteuerte Magnete ausgebildet.The
Die Magnete 5 werden in Umfangsrichtung 17 gesehen hintereinander angeordnet, was zu einer ersten Magnetenkreisreihe 18 führt. Es wird hierbei eine Anzahl von n Magneten 5 in der Umfangsrichtung 17 vorgesehen, wobei eine n eine positive ganze Zahl darstellt. Die Magnete 5 werden in einem regelmäßigen Abstand von
Damit das Magnetfeld möglichst homogen ausgebildet wird, wird die zweite Magnetenkreisreihe 19 gegen die erste Magnetenkreisreihe 18 versetzt angeordnet. Die dritte Magnetenkreisreihe 20 wird wiederum gegen die zweite Magnetenkreisreihe 19 versetzt. Die Versetzung der dritten Magnetenkreisreihe 20 gegenüber der zweiten Magnetenkreisreihe 19 und die Versetzung der zweiten Magnetenkreisreihe 19 gegenüber der ersten Magnetenkreisreihe 18 sollte äquidistant sein. Die Versetzung 21 kann eine gesamte lange Kante 13 sein. Die Versetzung 21 kann eine halbe lange Kante 13 sein. Ebenso kann in einer alternativen Ausführungsform die Versetzung ein Viertel der langen Kante 13 sein. Zwischen den einzelnen Magneten 5 ist ein Abstand 22. Der Abstand 22 ergibt sich zwangsläufig aus der Größe des Magneten 5, insbesondere der langen Kante 13 und der Anzahl n an Magneten und dem Umfang u, da die Magnete 5 in äquidistanten Abständen 22 zueinander zu einer Magnetenkreisreihe 18, 19, 20 angeordnet werden.So that the magnetic field is formed as homogeneous as possible, the second
In der
Claims (10)
- Turbomachine,
comprising a blade (1) which is rotatably arranged around a rotational axis (23) and oriented along a blade axis (7), a housing which is arranged around the blade (1), and a magnet (5) which is arranged in the housing,
wherein the magnetic north pole (N) and the magnetic south pole (S) of the magnet (5) lie on a circular path (24), and form a magnetic field (B ) with magnetic lines of force, wherein the blade tip is moved through this magnetic field, wherein the circular path (24) is oriented rotationally symmetrically around the rotational axis (23), characterized in that
a plurality of induction plates (3) which are arranged in the blade tip and which are oriented in a plane which is formed by the rotational axis (23) and a radial direction (16). - Turbomachine according to Claim 1,
wherein the circular path (24) extends along an inner circumferential surface of the housing. - Turbomachine according to Claim 1 or 2,
wherein the induction plate (3) is formed from an electrically conductive material. - Turbomachine according to one of the preceding claims, wherein the magnet (5) is of horseshoe-shaped design.
- Turbomachine according to one of the preceding claims, wherein the magnet (5) is of U-shaped design.
- Turbomachine according to one of the preceding claims, wherein a plurality of magnets (5) are arranged in series, as seen in the circumferential direction (17), forming a first circular magnet row (18).
- Turbomachine according to Claim 6,
wherein a number of n magnets (5) are provided in the circumferential direction (17),
wherein n represents a positive whole number, and the magnets (5) are arranged in series with a regular spacing of
wherein u represents the circumference of the inner circumferential surface. - Turbomachine according to Claim 6 or 7,
wherein provision is made for a second circular magnet row (19), comprising a plurality of magnets (5) which are arranged in the circumferential direction (17),
wherein the second circular magnet row (19) is arranged in the axial direction from the first circular magnet row (18). - Turbomachine according to Claim 9,
wherein the magnets (5) of the second circular magnet row (19) are arranged in an offset manner in relation to the magnets (5) of the first circular magnet row (18).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08864578A EP2229506B1 (en) | 2007-12-21 | 2008-11-25 | Magnetic device for damping blade vibrations in turbomachines |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07024982A EP2072755A1 (en) | 2007-12-21 | 2007-12-21 | Magnetic device for dampening blade vibration in turbo engines |
PCT/EP2008/066156 WO2009080433A1 (en) | 2007-12-21 | 2008-11-25 | Magnetic device for damping blade vibrations in turbomachines |
EP08864578A EP2229506B1 (en) | 2007-12-21 | 2008-11-25 | Magnetic device for damping blade vibrations in turbomachines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2229506A1 EP2229506A1 (en) | 2010-09-22 |
EP2229506B1 true EP2229506B1 (en) | 2011-06-29 |
Family
ID=39884199
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07024982A Withdrawn EP2072755A1 (en) | 2007-12-21 | 2007-12-21 | Magnetic device for dampening blade vibration in turbo engines |
EP08864578A Not-in-force EP2229506B1 (en) | 2007-12-21 | 2008-11-25 | Magnetic device for damping blade vibrations in turbomachines |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07024982A Withdrawn EP2072755A1 (en) | 2007-12-21 | 2007-12-21 | Magnetic device for dampening blade vibration in turbo engines |
Country Status (6)
Country | Link |
---|---|
US (1) | US8568088B2 (en) |
EP (2) | EP2072755A1 (en) |
JP (1) | JP5143236B2 (en) |
CN (1) | CN101952554B (en) |
AT (1) | ATE514837T1 (en) |
WO (1) | WO2009080433A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012088143A1 (en) * | 2010-12-20 | 2012-06-28 | Nrg Systems Inc. | System and method for damping a wind vane |
DE102012201048B4 (en) * | 2012-01-25 | 2014-03-27 | MTU Aero Engines AG | Method and damping device for vibration damping of a blade of a turbomachine, and turbomachine |
JP6380845B2 (en) * | 2014-12-22 | 2018-08-29 | 三菱日立パワーシステムズ株式会社 | Rotating machine |
US10371050B2 (en) * | 2014-12-23 | 2019-08-06 | Rolls-Royce Corporation | Gas turbine engine with rotor blade tip clearance flow control |
US11148784B2 (en) * | 2017-03-31 | 2021-10-19 | Alluvionic, Inc. | Propeller system with directional thrust control |
JP7272935B2 (en) * | 2019-11-18 | 2023-05-12 | 三菱重工業株式会社 | Vibration suppression device for rotating machinery and rotating machinery |
EP4100322A4 (en) * | 2020-02-03 | 2024-01-03 | Kymatics, LLC | Rotor active stability control |
CN111677589B (en) * | 2020-06-10 | 2024-07-19 | 中国船舶重工集团公司第七0三研究所 | Vibration damping and impact resisting assembly of composite elastic cantilever type gas turbine supporting ring |
US11739645B2 (en) | 2020-09-30 | 2023-08-29 | General Electric Company | Vibrational dampening elements |
US11536144B2 (en) | 2020-09-30 | 2022-12-27 | General Electric Company | Rotor blade damping structures |
JP2023063900A (en) | 2021-10-25 | 2023-05-10 | 三菱重工業株式会社 | Blade and blisk blade |
US11746659B2 (en) | 2021-12-23 | 2023-09-05 | Rolls-Royce North American Technologies Inc. | Fan blade with internal shear-thickening fluid damping |
US11560801B1 (en) | 2021-12-23 | 2023-01-24 | Rolls-Royce North American Technologies Inc. | Fan blade with internal magnetorheological fluid damping |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE426057C (en) * | 1924-10-17 | 1926-03-01 | Kopp & Kausch | Device for preventing ice formation on compressed air turbines |
EP0214393B1 (en) * | 1985-08-31 | 1989-12-13 | BBC Brown Boveri AG | Antivibration device for turbo machine blades |
US5365663A (en) * | 1992-04-28 | 1994-11-22 | Westinghouse Electric Corporation | Method of attaching a monitor target to a shrouded blade |
US5490759A (en) * | 1994-04-28 | 1996-02-13 | Hoffman; Jay | Magnetic damping system to limit blade tip vibrations in turbomachines |
DE19505389A1 (en) * | 1995-02-17 | 1996-08-22 | Abb Research Ltd | Vibration damping for turbine blades |
US5967749A (en) * | 1998-01-08 | 1999-10-19 | Electric Boat Corporation | Controllable pitch propeller arrangement |
DE19937146A1 (en) | 1999-08-06 | 2001-02-08 | Abb Research Ltd | Magnetic device for damping turbo machine blade oscillations has magnet(s) mounted on first vane end on first blade so end(s) of magnet(s) is opposite second vane end on second blade |
GB2409936B (en) * | 2001-02-09 | 2005-09-14 | Rolls Royce Plc | Gas turbine with electrical machine |
US6895751B1 (en) * | 2004-03-08 | 2005-05-24 | Christopher Greentree | Vane control |
GB0410778D0 (en) | 2004-05-13 | 2004-06-16 | Rolls Royce Plc | Blade arrangement |
GB2438185A (en) * | 2006-05-17 | 2007-11-21 | Rolls Royce Plc | An apparatus for preventing ice accretion |
-
2007
- 2007-12-21 EP EP07024982A patent/EP2072755A1/en not_active Withdrawn
-
2008
- 2008-11-25 EP EP08864578A patent/EP2229506B1/en not_active Not-in-force
- 2008-11-25 US US12/809,205 patent/US8568088B2/en not_active Expired - Fee Related
- 2008-11-25 CN CN200880121918.4A patent/CN101952554B/en not_active Expired - Fee Related
- 2008-11-25 JP JP2010538535A patent/JP5143236B2/en not_active Expired - Fee Related
- 2008-11-25 AT AT08864578T patent/ATE514837T1/en active
- 2008-11-25 WO PCT/EP2008/066156 patent/WO2009080433A1/en active Application Filing
Also Published As
Publication number | Publication date |
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ATE514837T1 (en) | 2011-07-15 |
EP2072755A1 (en) | 2009-06-24 |
CN101952554A (en) | 2011-01-19 |
US20100278636A1 (en) | 2010-11-04 |
CN101952554B (en) | 2014-06-18 |
JP2011506840A (en) | 2011-03-03 |
WO2009080433A1 (en) | 2009-07-02 |
US8568088B2 (en) | 2013-10-29 |
EP2229506A1 (en) | 2010-09-22 |
JP5143236B2 (en) | 2013-02-13 |
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