EP1944466A1 - Accouplement de deux aubes mobiles - Google Patents

Accouplement de deux aubes mobiles Download PDF

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Publication number
EP1944466A1
EP1944466A1 EP07000454A EP07000454A EP1944466A1 EP 1944466 A1 EP1944466 A1 EP 1944466A1 EP 07000454 A EP07000454 A EP 07000454A EP 07000454 A EP07000454 A EP 07000454A EP 1944466 A1 EP1944466 A1 EP 1944466A1
Authority
EP
European Patent Office
Prior art keywords
coupling element
blade
recesses
recess
cover plates
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07000454A
Other languages
German (de)
English (en)
Inventor
Peter Haase
Bernd Leidinger
Karl Dr. Urlichs
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
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 filed Critical Siemens AG
Priority to EP07000454A priority Critical patent/EP1944466A1/fr
Publication of EP1944466A1 publication Critical patent/EP1944466A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—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
    • 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
    • F01D5/16—Form or construction for counteracting blade vibration
    • 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
    • F01D5/3053—Fixing blades to rotors; Blade roots ; Blade spacers by means of pins
    • 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
    • F05D2250/20—Three-dimensional
    • F05D2250/23—Three-dimensional prismatic
    • F05D2250/232—Three-dimensional prismatic conical

Definitions

  • the invention relates to a blade with a cover plate at an upper end of an airfoil.
  • the invention relates to a device for coupling two blades, comprising two cover plates of the blades, which are spaced from each other by a gap and each having a recess into which a gap bridging the coupling element is inserted.
  • turbomachines particularly steam turbines
  • blades of a first row of blades are hit by high-velocity gas or superheated steam, which drives the blades to momentum by momentum transfer.
  • steam turbines If steam turbines are to operate a large portion of their operating time in a partial load range, they usually include a control stage for improving the efficiency.
  • the hot steam from several valves is simultaneously directed to the first row of blades.
  • the steam flow is not uniformly reduced in all valves, but it is successively throttled individual valves, with other valves are fully flowed through with superheated steam.
  • a device for coupling two blades of the type mentioned in which the coupling element rests on tangentially to each other angled contact surfaces on the cover plates and the cover plates is tangentially supported against each other.
  • the coupling element rests on tangentially to each other angled contact surfaces on the cover plates and the cover plates is tangentially supported against each other.
  • the invention is therefore based on the further consideration that a mechanical load on the blades not only by a vibration damping by energy extraction by Friction is useful, but by a stiffening in the radially outer region, whereby a vibration-exciting energy transfer from superheated steam can be significantly reduced to the blades. Any existing friction elements can be spared in their load and wear can be reduced.
  • the coupling element rests on tangential to each other angled contact surfaces on the cover plates, wherein the Anwinkelung may be small, but should always be> 0 °, in particular> 5 °. It can go up to 180 °, so that the contact surfaces are exactly opposite, parallel surfaces.
  • the contact surfaces can merge seamlessly, e.g. as part of a spherical surface or a surface of an ellipsoid of revolution. They can both be part of the contact element or each contact surface can be part of one of the recesses.
  • the coupling element can support the two cover plates by a tangential positive connection with the cover plates against each other.
  • the recesses are bag-shaped. As a result, the recesses can be easily made with contact points for tangential support.
  • the recesses each comprise an obliquely oriented to the tangential direction contact surface for the mutual interaction on both sides simultaneous contact with the coupling element.
  • the coupling element can push away the contact surface a little bit obliquely elastic, whereby a hard beating cushioned or can be completely prevented.
  • the coupling element can be pushed deeper into the recess by the pressure, whereby a slight damping by friction is made possible.
  • An oblique orientation to the tangential direction is an orientation with an angle greater than 5 °, in particular greater than 10 ° to the tangential direction.
  • the two recesses form a radially tapering inner wedge in the common interaction.
  • a pressed by the centrifugal force to the outside coupling element can thus achieve a wedge effect, which presses the cover plates against each other and thus form a stable association.
  • the radial direction can be seen in relation to the blades.
  • oblique contact surfaces can be easily produced when the recesses are tapered inward.
  • the recesses may be conical, whereby a simple production can be achieved. Also conceivable are round or spherical recesses.
  • a simple production of the coupling element combined with a good support and damping effect can be achieved if the coupling element is conically shaped on both sides in the tangential direction.
  • the supporting and damping effect can be further improved if the recesses conical with a Inner cone angle are executed and an outer cone angle of the coupling element is greater than the inner cone angle.
  • the coupling element abuts against a contact surface of the recess with an edge or if an edge of the recess rests against an outer surface of the coupling element, then there is the risk that a shoulder is incorporated into the contact surface or outer surface by non-elastic deformation, which results in desired mobility of the contact surface Counteracts coupling element in the recess.
  • a risk can be reduced or eliminated if the coupling element has a contact surface convexly curved in the direction of the recess interior for engagement with an inner surface or contact surface of a recess.
  • the coupling element can be designed as an ellipsoid of revolution or a part thereof.
  • both the recess and the coupling element are rotationally symmetrical.
  • the contact between the two is expediently annular, in particular circular, around the coupling element.
  • both recesses are identically shaped.
  • the coupling element In order to be able to absorb a sufficient force between the two cover plates, the coupling element must have a corresponding one Have size. As a result, a thickening of the cover plates in the region of the recesses may be necessary. A radially outwardly directed thickening makes it difficult to attach structures to the radially outer side of the cover plate, which are provided to a seal between the cover plate and the turbine housing.
  • An arrangement of a coupling element between the cover plates without thickening can be achieved if the coupling element has a longitudinal direction which is oriented in a gap longitudinal direction, in particular in an axial gap longitudinal direction, which can be tilted at a rhomboid angle to the axial direction of the blade.
  • the gap longitudinal direction extends between the cover plates. It can be achieved an extended support in the form of a surface or line with a narrow in the radial direction of the blade recess.
  • the coupling element may be, if it is cylindrical.
  • the recess is a groove, in particular corresponding to the coupling element, then it can easily be produced in the cover plate.
  • the groove is closed at one end by a limiting element and open at the other end. By the limiting element from falling out of the coupling element can be prevented from the groove. In the open side, a corresponding limiting element of the adjacent cover plate engage and secure it against falling out of the coupling element.
  • a good sealing of the cover plate against a turbine housing can be facilitated if the cover plate has a bump-free radial outer surface, in particular a cylindrical radial outer surface. sealing Structures can be placed on the outer surface without complex adaptation.
  • Blades with the coupling element according to the invention are easier to use in the radial direction of a blade holder of a rotor than in the axial direction, for example, with known Christmas tree connections.
  • the device advantageously comprises two blade roots of the blades with a connecting means for radial insertion into a blade holder of a rotor.
  • the blade root or its connecting means is held by a tapping on the blade holder.
  • the invention is also directed to a blade ring for a turbomachine having a bandage of blades, wherein each adjacent cover plates of the blades are supported by a device as described above in operation tangentially against each other. It can support the entire blade ring in itself and a load of a steam steel on one or a few blades can be distributed over the entire blade ring.
  • FIG. 2 and FIG. 3 each show a schematic representation of a section of a blade ring of a blade row of a control stage of a steam turbine. Shown are two identical blades 2, which are supported by a centrifugally urged radially outward coupling element 4 in operation together.
  • FIG. 1 shows the rotor blades 2 in a sectional view in the axial direction 8 of the rotor of the steam turbine, FIG. 2 in the tangential direction 6 and FIG. 3 in a partially sectioned view from radially outside.
  • Blades 2 each include a blade root 10, an airfoil 2a, and a top plate 12 which are integrally connected together by a blade 14 for generating rotation of the blade row.
  • the cover plates 12 each have a cylinder-segment-shaped formation 16 radially outward, in the tangential direction 6 on both sides an inwardly tapering, bag-shaped recess 18 is introduced in the form of a cone.
  • a cylindrical recesses are conceivable.
  • Two mutually facing recesses 18 each form a cavity 18 a, in which a coupling element 4 is inserted. In this way, between all the blades 2 of the Blade ring each used a coupling element 4, so that all the blades 2 of the blade ring are supported against each other. The support takes place during operation by means of the centrifugal force to the outside pressed coupling element 4, which is pressed tangentially to each other when moving the cover plates 12 to radially inward.
  • the coupling element 4 in the recesses 18 is enlarged in FIG. 4 shown. It is tapered on both sides as a double cone formed with two frustoconical, designed as contact surfaces 20 lateral surfaces which are angled in the tangential direction at an angle of 30 ° to each other. This angle is a sharper, ie larger cone angle than that of the contact surfaces 22 of the recesses 18, which are angled tangentially to each other at 25 °. In this way, each of the two contact surfaces 20 abut circularly on an outer edge 24 of the recesses 18.
  • the coupling element 4 is with a slight bias between the blades 2 used so that the blades 2 in the resting state slightly press on the coupling element 4, which holds the blades 2 by a gap 26 between facing surfaces 28 of the cover plates 12 spaced.
  • An axis of symmetry of the coupling element 4 is aligned in the tangential direction 6, neglecting a rhomboid angle 30 between the axial direction 8 and a gap longitudinal direction 32 of the gap 26.
  • the blade roots 10 are provided with fingers 38 which are held by bolts 40 in the blade holder 36.
  • the rotor blades 2 rotate about an axis of rotation 8 aligned axis of rotation. Due to an uneven influx of the blades 14 with superheated steam, a force which is uneven in magnitude and rhythmic in time engages in the axial direction 8 and tangential direction 6 on the blades 14, which are thereby excited to vibrate. Due to the coupling elements 4 between the cover plates 12, these vibration movements transmitted to the cover plates 12 are largely synchronized in the tangential direction 6 and also in the axial direction 8, so that a shock on a blade 14 is partially distributed to the neighboring blades.
  • the cover plates 12 are free of play against the pressed out to the outside or completely clamped coupling elements 4, so that the cover plates 12 can be supported without play together. It is thereby a stiffening of all cover plates 12 together, mainly in Tangentialcardi 6 but also reached in the axial direction 8.
  • the coupling element 4 can be pressed a little way into the recesses 18, whereby a cushioning of a hard impact on a blade 2 is made possible.
  • the impressions in a recess 18 is connected to an elastic deformation of the cover plate 12 in the region of the recess 18 and the coupling element 4 in the region of the contact point of the cover plate 12, so that in this way the cushioning is achieved.
  • the outer edge 24 of the cover plate 12 rubs over the contact surface 20 of the coupling element 4, so that a damping of the impact movement takes place by friction.
  • FIG. 5 An alternative coupling element 42 in the same cover plates 12 of blades 2 is in FIG. 5 shown.
  • the following descriptions are essentially limited to the differences from previous embodiments. With regard to features and functions that remain the same, reference is made to the preceding exemplary embodiments. Substantially identical components are basically numbered with the same reference numerals.
  • the coupling element 42 is designed in the form of an ellipsoid of revolution and has in the direction of the interior of the recesses 18 convexly curved contact surfaces 44 for engagement with the contact surfaces 22 of the recesses 18, which merge between the cover plates 12 into one another.
  • the contact surfaces 22 serve as support surfaces or contact surfaces, which are inclined by about 15 ° to a support direction or pressure direction pointing in the tangential direction 6. At the points where the contact surfaces 44 the Touch contact surfaces 22, the contact surfaces 44 are angled at 30 ° to each other.
  • the location of the circular contact point between the coupling element and the cover plate 12 can be adjusted specifically in the tangential direction 6.
  • the coupling element 42 can tumble about the tangential direction 6, wherein the wobble deflection depends on the size of the gap 46 and can be adjusted by a corresponding shaping of the recess 18. Outside the wobble deflection, the coupling element 42 acts as a substantially rigid reinforcement in the axial direction 8 and radial direction 34.
  • FIGS. 6 and 7 show cover plates 48 with bilateral spherical recesses 50 into which a spherical coupling element 52 (FIG. FIG. 6 ) or a flattened spherical one Coupling element 54 ( FIG. 7 ) is used.
  • a spherical coupling element 52 FIG. 6
  • a flattened spherical one Coupling element 54 FIG. 7
  • the contact surfaces 58 are angled by about 20 ° to each other. In the coupling element 54, it is about 15 °.
  • the spherical coupling element 52 acts as the coupling element 4, but with a different spring action. Due to the similar orientation of contact surfaces 56 of the recess 50 in the region of the outer edge 24 as the spherical cap-shaped contact surfaces 58 of the coupling element 52 at the location of the outer edge 24, the coupling element 52 at an annular abutment against the cover plates 12 initially with only a small force in the recess 50th be pressed under elastic deformation of the cover plate 48. With further impressions, however, the counterforce increases very strongly, so that a strong nonlinearity in the spring force can be achieved in dependence on the Eindgurumble. As a result, suitable vibration parameters for avoiding vibrations of the rotor blades 60 can be set. At the in FIG. 7 illustrated embodiment, this advantage is associated with the prevention of the formation of paragraphs in the coupling element 54 by the coupling element abuts the surface of the contact surface 56 at this.
  • FIGS. 8 to 10 show, analogously to FIGS. 1 to 3, alternative rotor blades 62 with a cylindrical coupling element 64 which is mounted in cover grooves 68 in a groove-shaped recess 66.
  • Each of the recesses 66 is closed on one longitudinal side by a web-like limiting element 70 and designed to be open on the opposite longitudinal side, so that the coupling element 64 by two opposing boundary elements 70 in the recess 66 in a Longitudinal direction 72 of the coupling element 64 and the recess 66 is held.
  • the longitudinal direction 72 is oriented in the gap longitudinal direction and along mutually facing side surfaces 74 of the cover plates 68 and tilted by the rhomboid angle 30 to the axial direction 8.
  • the coupling element 64 Due to the elongated shape of the coupling element 64, this always lies with a linear contact form-fitting only radially outside, or in the case of firm clamping radially inwards and outwards against the recess 66.
  • the locations of the cylindrical contact surfaces of the coupling element 64, which respectively contact the recesses 66 of the cover plates 68 in a line-shaped manner, are angled tangentially by about 60 ° to one another.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP07000454A 2007-01-10 2007-01-10 Accouplement de deux aubes mobiles Withdrawn EP1944466A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07000454A EP1944466A1 (fr) 2007-01-10 2007-01-10 Accouplement de deux aubes mobiles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07000454A EP1944466A1 (fr) 2007-01-10 2007-01-10 Accouplement de deux aubes mobiles

Publications (1)

Publication Number Publication Date
EP1944466A1 true EP1944466A1 (fr) 2008-07-16

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Family Applications (1)

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EP07000454A Withdrawn EP1944466A1 (fr) 2007-01-10 2007-01-10 Accouplement de deux aubes mobiles

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EP (1) EP1944466A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2213837A1 (fr) * 2009-01-29 2010-08-04 Siemens Aktiengesellschaft Système de pale de turbine
DE102009052883A1 (de) 2009-11-13 2011-05-19 Mtu Aero Engines Gmbh Kopplungselement zur mechanischen Kopplung von Schaufeln und Rotor
EP2378068A2 (fr) 2010-04-16 2011-10-19 MTU Aero Engines AG Elément d'amortissement et méthode d'amortissement des vibrations d'une pale, pale du rotor et le rotor
EP2615246A1 (fr) 2012-01-16 2013-07-17 MTU Aero Engines GmbH Bague d'aube directrice, segment d'aube directrice, procédé de fabrication d'un segment d'aube directrice et turbomachine
DE102012201048A1 (de) 2012-01-25 2013-07-25 Mtu Aero Engines Gmbh Verfahren und Dämpfungseinrichtung zur Schwingungsdämpfung eines Bauteils, sowie Strömungsmaschine
EP2803821A1 (fr) * 2013-05-13 2014-11-19 Siemens Aktiengesellschaft Dispositif d'aube, système d'aubes et procédé de fabrication associé d'un système d'aubes
JP2017048791A (ja) * 2015-09-03 2017-03-09 ゼネラル・エレクトリック・カンパニイ 隣接するタービンブレードの制振用ダンパピン
US20190345830A1 (en) * 2018-05-08 2019-11-14 Rolls-Royce Plc Damper

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990813A (en) * 1973-11-30 1976-11-09 Hitachi, Ltd. Apparatus for tying moving blades
JPS6149103A (ja) * 1984-08-16 1986-03-11 Toshiba Corp タ−ビン動翼連結装置
DE3517283A1 (de) * 1985-05-14 1986-11-20 MAN Gutehoffnungshütte GmbH, 4200 Oberhausen Bindung von laufschaufeln einer thermischen turbomaschine
EP0806545A1 (fr) * 1996-05-09 1997-11-12 ROLLS-ROYCE plc Cheville amortisseur des vibrations dans les bandes de recouvrement pour turbomachines
JP2000204901A (ja) * 1999-01-08 2000-07-25 Mitsubishi Heavy Ind Ltd 軸流回転機械における動翼の制振構造
WO2003014529A1 (fr) * 2001-08-03 2003-02-20 Hitachi, Ltd. Aube mobile de turbine
EP1512838A2 (fr) * 2003-09-02 2005-03-09 Man Turbo Ag Rotor pour turbine à vapeur ou à gaz

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990813A (en) * 1973-11-30 1976-11-09 Hitachi, Ltd. Apparatus for tying moving blades
JPS6149103A (ja) * 1984-08-16 1986-03-11 Toshiba Corp タ−ビン動翼連結装置
DE3517283A1 (de) * 1985-05-14 1986-11-20 MAN Gutehoffnungshütte GmbH, 4200 Oberhausen Bindung von laufschaufeln einer thermischen turbomaschine
EP0806545A1 (fr) * 1996-05-09 1997-11-12 ROLLS-ROYCE plc Cheville amortisseur des vibrations dans les bandes de recouvrement pour turbomachines
JP2000204901A (ja) * 1999-01-08 2000-07-25 Mitsubishi Heavy Ind Ltd 軸流回転機械における動翼の制振構造
WO2003014529A1 (fr) * 2001-08-03 2003-02-20 Hitachi, Ltd. Aube mobile de turbine
EP1512838A2 (fr) * 2003-09-02 2005-03-09 Man Turbo Ag Rotor pour turbine à vapeur ou à gaz

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8894353B2 (en) 2009-01-29 2014-11-25 Siemens Aktiengesellschaft Turbine blade system
WO2010086214A1 (fr) * 2009-01-29 2010-08-05 Siemens Aktiengesellschaft Système d'aubes de turbine
EP2213837A1 (fr) * 2009-01-29 2010-08-04 Siemens Aktiengesellschaft Système de pale de turbine
DE102009052883A1 (de) 2009-11-13 2011-05-19 Mtu Aero Engines Gmbh Kopplungselement zur mechanischen Kopplung von Schaufeln und Rotor
WO2011057613A2 (fr) 2009-11-13 2011-05-19 Mtu Aero Engines Gmbh Élément d'accouplement pour accoupler mécaniquement des aubes et un rotor
US9045989B2 (en) 2009-11-13 2015-06-02 Mtu Aero Engines Gmbh Coupling element for mechanically coupling blades and a rotor
EP2378068A2 (fr) 2010-04-16 2011-10-19 MTU Aero Engines AG Elément d'amortissement et méthode d'amortissement des vibrations d'une pale, pale du rotor et le rotor
DE102010015211B4 (de) * 2010-04-16 2013-06-20 Mtu Aero Engines Gmbh Dämpfungselement zur Dämpfung von Laufschaufelschwingungen, Laufschaufel sowie Rotor
DE102010015211A1 (de) 2010-04-16 2011-10-20 Mtu Aero Engines Gmbh Dämpfungselement und Verfahren zur Dämpfung von Laufschaufelschwingungen, Laufschaufel sowie Rotor
US9074479B2 (en) 2010-04-16 2015-07-07 Mtu Aero Engines Gmbh Damping element and method for damping rotor blade vibrations, a rotor blade, and a rotor
EP2615246A1 (fr) 2012-01-16 2013-07-17 MTU Aero Engines GmbH Bague d'aube directrice, segment d'aube directrice, procédé de fabrication d'un segment d'aube directrice et turbomachine
DE102012201048A1 (de) 2012-01-25 2013-07-25 Mtu Aero Engines Gmbh Verfahren und Dämpfungseinrichtung zur Schwingungsdämpfung eines Bauteils, sowie Strömungsmaschine
DE102012201048B4 (de) * 2012-01-25 2014-03-27 MTU Aero Engines AG Verfahren und Dämpfungseinrichtung zur Schwingungsdämpfung einer Schaufel einer Strömungsmaschine, sowie Strömungsmaschine
EP2803821A1 (fr) * 2013-05-13 2014-11-19 Siemens Aktiengesellschaft Dispositif d'aube, système d'aubes et procédé de fabrication associé d'un système d'aubes
JP2017048791A (ja) * 2015-09-03 2017-03-09 ゼネラル・エレクトリック・カンパニイ 隣接するタービンブレードの制振用ダンパピン
US20190345830A1 (en) * 2018-05-08 2019-11-14 Rolls-Royce Plc Damper

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