EP2242909B1 - Turbomachine rotor, rotor blade for such a turbomachine rotor and corresponding assembling method - Google Patents

Turbomachine rotor, rotor blade for such a turbomachine rotor and corresponding assembling method Download PDF

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Publication number
EP2242909B1
EP2242909B1 EP09709892A EP09709892A EP2242909B1 EP 2242909 B1 EP2242909 B1 EP 2242909B1 EP 09709892 A EP09709892 A EP 09709892A EP 09709892 A EP09709892 A EP 09709892A EP 2242909 B1 EP2242909 B1 EP 2242909B1
Authority
EP
European Patent Office
Prior art keywords
rotor
blade root
turbomachine rotor
blade
threaded hole
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.)
Not-in-force
Application number
EP09709892A
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German (de)
French (fr)
Other versions
EP2242909A1 (en
Inventor
Francois Benkler
Jörn Bettentrup
Frank Deister
Rudolf Küperkoch
Nicolas Savilius
Oliver Schneider
Dirk Wistuba
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Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP09709892A priority Critical patent/EP2242909B1/en
Publication of EP2242909A1 publication Critical patent/EP2242909A1/en
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Publication of EP2242909B1 publication Critical patent/EP2242909B1/en
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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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3092—Protective layers between blade root and rotor disc surfaces, e.g. anti-friction layers
    • 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
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/323—Locking of axial insertion type blades by means of a key or the like parallel to the axis of the rotor
    • 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
    • F01D5/32—Locking, e.g. by final locking blades or keys
    • F01D5/326—Locking of axial insertion type blades by other means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • the invention relates to a turbomachine rotor having biasing means for biasing a blade, the blade having the biasing means, and a method of assembling the turbomachine rotor.
  • a gas turbine is a thermal turbomachine in which conventionally fossil fuels, such as natural gas, are burned.
  • the gas turbine can be used for example in a gas and steam power plant, which is provided to cover peak loads in a power grid.
  • the gas turbine is driven in transient operation, whereby the individual components and components of the gas turbine are subjected to transient loads. Due to the high power density of the gas turbine high demands are to be met in terms of the strength of highly loaded components in order to ensure a long service life of these components and long maintenance cycles and a low spare parts requirement.
  • the gas turbine has a compressor with a compressor rotor and a turbine with a turbine rotor, wherein the compressor rotor and the turbine rotor are rotationally locked together via a shaft.
  • the compressor rotor and / or the turbine rotor are designed in axial construction, that is, on the shaft a plurality of wheel disks are threaded one behind the other.
  • a blade row is attached in each case.
  • Each blade row has a plurality of blades, each having an aerodynamically effective airfoil and a blade root. The blade root is inserted into a groove located on the outer circumference of the wheel disc, see above the blade is held in a form-fitting manner on the blade root, in particular in the radial direction of the gas turbine rotor.
  • the blade root and the groove have corresponding dovetail profiles or fir tree profiles. These profiles are arranged running in the axial direction of the gas turbine rotor, so that for mounting the blade, this is inserted with its blade root in the axial direction of the gas turbine rotor in the groove. Between the blade root and the profile of the groove a game is provided so that the blade root is wear-free inserted into the groove. Caused by the game, the blades may move during operation of the gas turbine resulting in a characteristic rattling of the blade. This is especially true for a large and heavy blade, as provided in particular in the first blade rows of the compressor of the gas turbine with a high performance.
  • the blade is preloaded in the groove to prevent rattling.
  • the blade is preloaded in the groove to prevent rattling.
  • the bias voltage assembly can be difficult.
  • an axial securing plate may be provided, with which the blade is secured against axial displacement and additionally biased.
  • the axial securing plate may be too weak to form.
  • Such Axialommesblech is from the US 2,786,648 and the US 4,102,602 known.
  • the slotted ends of the sheet protrude beyond the ends of the groove.
  • the teeth formed by the slots are each mutually outwardly and inwardly bent to avoid axial displacement of the blade along the groove.
  • the sheet is curved in the middle, to keep the blade biased in the groove.
  • the object of the invention is to provide a turbomachine rotor, a blade and a method for assembling the turbomachine engine, wherein the turbomachine rotor can be operated without rattling the blades with high strength and efficiency.
  • the turbomachine rotor has along the circumference uniformly spaced grooves, in each of which a blade is inserted with a blade root, so that the blade is positively held with the groove in the radial direction, and a biasing device, both on a groove bottom of the groove and on the Paddle is supported and exerts on the blade root a biasing force in the radial direction, wherein the biasing means is arranged such that the biasing force is adjustable in the assembled state of the turbomachine rotor.
  • the biasing force is set to be predetermined high.
  • the biasing force low, so that wear on the blade root and in the groove is prevented due to the assembly of the blade.
  • the force required when inserting the blade root into the groove is advantageously low, so that only slight stress peaks occur in the blade root and in the wheel disk during assembly of the blade.
  • the biasing device also has at least one adjusting screw, with which by applying a predetermined tightening torque, the biasing force in the assembled state of the turbomachine rotor is adjustable.
  • the adjusting screw By means of the adjusting screw is the setting of the predetermined biasing force on the specification of a torque of the screw allows. As a result, the preload force can be applied to the blade via the tightening torque.
  • the set screw is provided with a fine thread, so that an accurate power transmission of the screw is made possible by the tightening torque on the biasing force.
  • At least one threaded hole is provided in the blade root, which opens at the bottom of the blade root facing the groove bottom of the groove, wherein at least one screw in the at least one threaded hole so is screwed that it protrudes on the blade root with its screw end and is supported indirectly on the groove bottom.
  • the adjusting screw penetrates the blade root through the threaded hole and is fixed therein, so that the prestressing force is applied indirectly to the groove bottom on the blade root in the radial direction by the support of the screw end.
  • the distributed along the circumference grooves are arranged in a wheel disc of the turbomachine rotor.
  • a modular turbomachinery rotor can be specified.
  • the biasing means comprises a support plate which is arranged on the groove base at least in the region of an adjusting screw, so that the adjusting screw and the support plate are in touching contact.
  • the support plate is located directly on the groove bottom in the groove, so that no additional groove needs to be provided in the groove base for the support plate.
  • the groove base is covered in the region of the adjusting screw of the support plate, so that the groove base is only in indirect contact via the support plate with the screw end of the screw. Thus, it is prevented that the end of the screw screw, especially when turning the screw damaged the groove bottom.
  • the at least one threaded hole with its end remote from the blade root underside to open outward on one of the front sides of the blade root, so that the threaded hole is inclined at an acute angle away from the longitudinal axis of the turbomachine rotor.
  • the threaded hole on the front side of the blade root is accessible, so that from there the adjusting screw are adjusted to the wheel disc after assembly of the blade can. Further, since the threaded hole extends from the end face of the blade root toward the blade root, the threaded hole penetrates the blade root in a mechanically little loaded area. This is little affected by the provision of the threaded hole in the blade root in its strength.
  • the biasing force applied by the adjusting screw has an axial and a radial component. This is advantageous because it applies both the radial preload force and an axial force for locking the blade in the wheel disc. As a result, both a radial and an axial attachment of the blade is ensured. On the degree of inclination of the screw, the division of the force transmitted through the screw force can be divided into the axial and radial attachment.
  • the support plate has at least one offset with a flat edge, which is shaped such that the end of the screw of the screw abuts the end face of the flat edge.
  • the end face of the screw end of the adjusting screw is also formed flat, so that when surface concerns of the screw end on the flank, the surface pressure is low.
  • the blade root has a first threaded hole with a first adjusting screw and a second threaded hole with a second adjusting screw, wherein the first threaded hole opens at one end side and the second threaded hole at the other end side of the blade root to the outside, so that the first threaded hole around a first acute angle and the second threaded hole about a second acute angle is inclined away from the longitudinal axis of the turbomachine rotor.
  • the two setscrews are mutually oppositely inclined, so that the force applied to the support plate axial force components counteract each other.
  • a stable attachment of the blade root in the groove can advantageously be achieved, with little or no resulting axial force acting on the blade root.
  • the support plate has the first offset with the first flank on which abuts the screw end of the first screw, and the second crank with the second flank against which abuts the screw end of the second screw.
  • the blade is locked at its blade root via the screws on the flanks of the cranks of the support plate in the axial direction positively.
  • first angle and the second angle have the same amount.
  • the biasing means in the plane perpendicular to the axial direction of the turbomachine rotor is formed symmetrically, so that the distribution of the biasing forces in the biasing means is symmetrical.
  • the biasing device, the blade root and the wheel are claimed balanced.
  • the support plate between the two cranks has a back portion which faces the blade root with its convex side.
  • the support plate is made of an elastic material.
  • the preload forces exerted by the set screws on the flanks of the cranks These are pressed in the direction of the groove bottom.
  • the back portion is curved, so that the back portion presses with its convex side on the blade root underside.
  • the biasing forces that exert the set screws on the support plate transferred to the blade root.
  • the bias of the blade is increased.
  • the back portion is pre-curved prior to its mounting, so that the back portion in the assembled state of the turbomachine engine presses on the blade root lower side.
  • the support plate has a spring action in the direction of the blade root lower side, whereby a Vorspannreserve in the case of setting, that is, when in operation increases the distance between the Schaufelfußunterseite and the groove bottom is created. Furthermore, the pre-curvature of the back portion in the assembled state allows a good adhesion over the surface contact formed with the set screws. About the stiffness and the thickness of the support plate, the Vorspannreserve can be predefined. By adjusting the set screws, the preload reserve in the assembled state can still be varied.
  • the support plate has at the first offset a first leg portion extending away from the back portion and at the second crank a second leg portion extending away from the back portion.
  • the first leg section has a first projection and the second leg section has a second projection, wherein the projections protrude out of the groove beyond the edge plate.
  • the support plate is in the assembled state from the outside tangible with the supernatants, so that disassembly and reassembly of the blade is easy to carry out.
  • the projections are arranged angled to the leg portions, so that the turbomachine rotor or the wheel disc is engaged with the support plate and thereby held in the axial direction of the turbomachine rotor.
  • the support plate is fixed to the wheel disc in the axial direction, in particular, even when the rotor blade is not yet inserted into the groove of the wheel disc during assembly of the turbomachine rotor.
  • the support blade placed in the groove on the groove bottom need not be retained from the outside when the blade root is inserted into the groove.
  • the supernatant can be bent or rolled over.
  • the at least one adjusting screw is secured against unintentional rotation by a securing means.
  • the securing means may preferably be an adhesive.
  • the set screw can be caulked with a grain impact in the blade.
  • the geometric dimensions of the support plate, the set screws and the tightening torque must be adapted to the mass of the blade.
  • the moving blade according to the invention which is intended to be mounted in an axially extending groove on the outer circumference of a turbomachinery rotor, has a Blade root with two opposite and arranged perpendicular to the longitudinal axis of the blade root end faces and extending between the two end faces of the blade root, the blade root having a first threaded hole and a second threaded hole, the two threaded holes open on the one hand on the blade root bottom to the outside, and on the other the first threaded hole at one end face and the second threaded hole at the other end side open the blade root to the outside so that the first threaded hole is inclined at a first acute angle and the second threaded hole is inclined at a second acute angle from the longitudinal axis of the turbomachine rotor.
  • the support plate for biasing a blade of a turbomachinery rotor has a longitudinal direction and has along this two opposing cranks, each with a planar edge, between which the support plate has a back portion.
  • the method of assembling a turbomachinery rotor comprises the steps of: providing the turbomachinery rotor with circumferentially distributed grooves extending substantially in the axial direction of the turbomachine rotor and having blades therein and a support plate; Inserting the blade into the groove, so that the blade root engages in the groove and so the blade is held in the groove form-fitting in the radial direction; Inserting the support plate in the groove between the blade root bottom and the groove bottom; Threading the first set screw into the first threaded hole and the second set screw into the second threaded hole until the set screws contact their corresponding cranks; Tightening the two set screws with a predetermined tightening torque to bias the blade in the radial direction with a predetermined biasing force in the groove.
  • a turbine engine rotor 1 has a plurality of rotor blades 2 and a wheel disk 16.
  • the rotor blades 2 are attached to the circumference of the wheel disc 16, so that a rotor stage of the turbomachine rotor 1 is formed.
  • the blade 2 is made in one piece and has an airfoil 3 and a blade root 4.
  • the blade 3 is aerodynamically effective, for example in a compressor or a turbine of a turbomachine.
  • the blade root 4 serves for fastening the blade 3 to the wheel disc 16.
  • the blade root 4 has in a plane which is perpendicular to the axis of rotation of the turbomachine rotor, a fir-tree profile-shaped cross-section and in a plane in which the axis of rotation of the turbomachine rotor is located, a rectangular cross-section.
  • the rectangular cross section of the blade root 4 is formed by a longitudinal side, adjacent to the blade 3, two mutually remote end faces, each are perpendicular to the axis of rotation of the turbomachine rotor 1, and a blade root bottom 15, which is arranged substantially parallel to the axis of rotation of the turbomachinery rotor 1 and the blade 3 is disposed.
  • the blade root 4 In the corner regions of the blade root 4, which lie in the region of the edges formed by the end faces and the blade root underside 15, the blade root 4 has regions 5 and 6 which are under little mechanical loading.
  • the first mechanically little loaded area 5 of the blade root 4 is of a first threaded hole 7 and the second mechanically little loaded area 6 of the blade root 4 is penetrated by a second threaded hole 8, the two threaded holes 7, 8 open at the blade root bottom 15 to the outside and the first threaded hole 7 open at the one end face of the blade root 4 and the second threaded hole 8 at the other end face of the blade root 4 to the outside.
  • a second screw 10 is screwed in the first threaded hole 7 a first screw 9 and in the second threaded hole 8, a second screw 10 is screwed.
  • the first adjusting screw 9 has a first screw end 11 and the second adjusting screw 10 has a second screw end 12, wherein the screw ends 11, 12 are each located on the blade root bottom side 15 outside of the blade root 4.
  • the two threaded holes 7, 8 and the two adjusting screws 9, 10 are arranged pivoted against each other, so that the first threaded hole 7 with the axis of rotation of the turbomachine rotor 1 a first angle 13 and the second threaded hole 8 with the axis of rotation of the turbomachine rotor 1 includes a second angle 14 ,
  • the two threaded holes 7, 8 are arranged to each other such that the two screw ends 11, 12 of the two screws 9, 10 are arranged facing each other.
  • the first angle 13 and the second angle 14 are acute angle and the same amount.
  • the wheel disc 16 has a groove 17 with a groove bottom 18, which is in engagement with the blade root 4.
  • Form the groove 17 is formed such that it encloses the longitudinal sides of the blade root 4 and the Schaufelfußunterseite 15 positively, so that the blade 2 is held by means of the Christmas tree profile of the blade root 4 in the groove 17 in the radial direction and in the circumferential direction of the turbomachine rotor 1 positively.
  • the groove 17 and the blade root 4 are formed such that during assembly of the turbomachine rotor 1, the blade 2 with its blade root 4 substantially in the axial direction of the turbomachine rotor 1 is inserted. In the assembled turbomachine rotor 1, the end faces of the blade root 4 are substantially flush with the end faces of the wheel disc 16.
  • the groove 17 is dimensioned such that between the groove bottom 18 and the blade root bottom 15 a gap is formed.
  • a support plate 19 is inserted, which has in its center a back portion 20 which is formed by a first crank 21 and a second crank 22.
  • a first leg section 25 adjoins the first offset 21 and a second leg section 26 adjoins the second offset 22, wherein the leg sections 25, 26 rest against the groove base 18 and the back section 20 rests against the underside of the blade foot 15.
  • the back portion 20 and the leg portions 25, 26 are arranged in alignment with each other.
  • the first offset 21 has a first flank 23 and the second offset 22 has a second flank 24, the first screw end 11 abutting the first crank 21 and the second screw end 12 abutting the second crank 24.
  • Both the first end of the screw 11 and the first edge 23 and the second end of the screw 12 and the second edge 24 are formed planar, so that the contact between the screws 10, 11 and the support plate 19 is made via a contact surface.
  • the two screws 9, 10 are screwed in their threaded holes 7, 8 and with a predetermined torque tightened, so that in each case a predetermined force is exerted by the set screws 9, 10 on the flanks 23, 24 and thus on the support plate 19.
  • the force has a radial component and an axial component, wherein when the two setscrews 9, 10 are tightened with the same tightening torque, the axial components cancel each other.
  • the radial components form a predetermined biasing force with which the blade root 4 is pre-biased in the groove 17 predetermined.
  • a first projection 27 and on the second leg portion 26 a second projection 28 is provided, wherein the projections 27, 28 extend out of the groove 17 on the wheel disc 16 away.
  • the two projections 27, 28 are arranged angled towards the center of the turbomachine rotor 1 to the leg portions 25, 26, so that with the projections 27, 28, the support plate 19 is arranged fixed on the groove bottom 18 in the axial direction of the turbomachine rotor 1.
  • FIGS. 3 and 4 the support plate 19 is shown, wherein the first projection 27 as an extension of the first leg portion 25 and the second projection 28 are arranged as an extension of the second leg portion 26.
  • FIG. 3 is the support plate 19 in the unmounted state and in FIG. 4 shown in the assembled state.
  • the support plate 19 is pre-curved, so that the support plate 19 in the unassembled state has a convex contour. Is the support plate 19, as it is in the FIG. 4 is shown, installed in the groove 17 together with the blade root 4, the support plate 19 is pressed straight, so that the support plate 19 exerts a spring force on the blade root 4 due to spring characteristics.
  • the blade 2 is inserted into the groove 17 substantially in the axial direction of the turbomachine rotor 1 inserted until the end faces of the blade root 4 are arranged in alignment with the end faces of the wheel disc 16.
  • the support plate 19 according to the in FIG. 3 shown embodiment pushed until the two projections 27 and 28 project from the wheel disc 16.
  • the first screw 9 is screwed into the first threaded hole 7 and the second screw 12 in the second threaded hole 8 until the first end of the screw 10, the first edge 23 and the second end of the screw 12, the second edge 24 touch.
  • the screws 9, 10 are tightened with the predetermined torque.
  • the projections 27 and 28 are bent in the direction of the center of the wheel disc 16, so that the projections 27, 28 abut against the wheel disc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Description

Die Erfindung betrifft einen Turbomaschinenrotor mit einer Vorspanneinrichtung zum Vorspannen einer Laufschaufel, die Laufschaufel mit der Vorspanneinrichtung und ein Verfahren zum Zusammenbauen des Turbomaschinenrotors.The invention relates to a turbomachine rotor having biasing means for biasing a blade, the blade having the biasing means, and a method of assembling the turbomachine rotor.

Eine Gasturbine ist eine thermische Turbomaschine, in der herkömmlich fossile Brennstoffe, wie beispielsweise Erdgas, verbrannt werden. Die Gasturbine kann beispielsweise in einem Gas- und Dampfkraftwerk eingesetzt sein, das zur Abdeckung von Spitzenlasten in einem Stromnetz vorgesehen ist. Dadurch wird die Gasturbine im instationären Betrieb gefahren, wodurch die einzelnen Komponenten und Bauteile der Gasturbine instationären Belastungen ausgesetzt sind. Auf Grund der hohen Leistungsdichte der Gasturbine sind hohe Anforderungen bezüglich der Festigkeit von hochbelasteten Bauteilen zu erfüllen, um eine hohe Lebensdauer dieser Bauteile und lange Wartungszyklen sowie einen geringen Ersatzteilbedarf zu gewährleisten.A gas turbine is a thermal turbomachine in which conventionally fossil fuels, such as natural gas, are burned. The gas turbine can be used for example in a gas and steam power plant, which is provided to cover peak loads in a power grid. As a result, the gas turbine is driven in transient operation, whereby the individual components and components of the gas turbine are subjected to transient loads. Due to the high power density of the gas turbine high demands are to be met in terms of the strength of highly loaded components in order to ensure a long service life of these components and long maintenance cycles and a low spare parts requirement.

Die Gasturbine weist einen Verdichter mit einem Verdichterrotor und eine Turbine mit einem Turbinenrotor auf, wobei der Verdichterrotor und der Turbinenrotor über eine Welle drehstarr miteinander gekuppelt sind. Herkömmlich sind der Verdichterrotor und/oder der Turbinenrotor in Axialbauweise ausgeführt, d.h., auf der Welle ist eine Mehrzahl von Radscheiben hintereinander aufgefädelt. An den Außenumfängen der Radscheiben ist jeweils eine Laufschaufelreihe befestigt. Jede Laufschaufelreihe weist eine Vielzahl von Laufschaufeln auf, die jeweils ein aerodynamisch wirksames Schaufelblatt und einen Schaufelfuß aufweisen. Der Schaufelfuß ist in eine am Außenumfang der Radscheibe befindliche Nut eingesetzt, so dass die Laufschaufel an dem Schaufelfuß insbesondere in Radialrichtung des Gasturbinenrotors formschlüssig gehalten ist.The gas turbine has a compressor with a compressor rotor and a turbine with a turbine rotor, wherein the compressor rotor and the turbine rotor are rotationally locked together via a shaft. Conventionally, the compressor rotor and / or the turbine rotor are designed in axial construction, that is, on the shaft a plurality of wheel disks are threaded one behind the other. At the outer peripheries of the wheel disks a blade row is attached in each case. Each blade row has a plurality of blades, each having an aerodynamically effective airfoil and a blade root. The blade root is inserted into a groove located on the outer circumference of the wheel disc, see above the blade is held in a form-fitting manner on the blade root, in particular in the radial direction of the gas turbine rotor.

Zum formschlüssigen Halten der Laufschaufel weisen der Schaufelfuß und die Nut miteinander korrespondierende Schwalbenschwanzprofile oder Tannenbaumprofile auf. Diese Profile sind in Axialrichtung des Gasturbinenrotors verlaufend angeordnet, so dass zur Montage der Laufschaufel diese mit ihrem Schaufelfuß in Axialrichtung des Gasturbinenrotors in die Nut eingeschoben wird. Zwischen dem Schaufelfuß und dem Profil der Nut ist ein Spiel vorgesehen, damit der Schaufelfuß verschleißfrei in die Nut einschiebbar ist. Hervorgerufen durch das Spiel können die Laufschaufeln im Betrieb der Gasturbine sich bewegen, was zu einem charakteristischen Klappern der Laufschaufel führt. Dies trifft insbesondere für eine große und schwere Laufschaufel zu, wie sie insbesondere in den ersten Laufschaufelreihen des Verdichters der Gasturbine mit einer hohen Leistung vorgesehen ist.For the positive retention of the blade, the blade root and the groove have corresponding dovetail profiles or fir tree profiles. These profiles are arranged running in the axial direction of the gas turbine rotor, so that for mounting the blade, this is inserted with its blade root in the axial direction of the gas turbine rotor in the groove. Between the blade root and the profile of the groove a game is provided so that the blade root is wear-free inserted into the groove. Caused by the game, the blades may move during operation of the gas turbine resulting in a characteristic rattling of the blade. This is especially true for a large and heavy blade, as provided in particular in the first blade rows of the compressor of the gas turbine with a high performance.

Herkömmlich ist die Laufschaufel mit Vorspannung in der Nut montiert, um das Klappern zu vermeiden. Jedoch kann insbesondere bei der großen und schweren Laufschaufel auf Grund der Vorspannung die Montage erschwert sein.Conventionally, the blade is preloaded in the groove to prevent rattling. However, especially in the case of the large and heavy blade due to the bias voltage assembly can be difficult.

Ferner verursacht die Vorspannung in der Radscheibe und dem Schaufelfuß eine mechanische Beanspruchung, die herkömmlich durch eine stabile und massive Ausführung der Radscheibe und des Schaufelfußes kompensiert ist. In der Nut kann ein Axialsicherungsblech vorgesehen sein, mit dem die Laufschaufel gegen eine axiale Verschiebung gesichert und zusätzlich vorgespannt ist. Jedoch kann für die große und schwere Laufschaufel das Axialsicherungsblech als zu schwach ausbildbar sein.Further, the bias in the wheel disc and the blade root causes a mechanical stress, which is conventionally compensated by a stable and solid design of the wheel disc and the blade root. In the groove, an axial securing plate may be provided, with which the blade is secured against axial displacement and additionally biased. However, for the large and heavy blades, the axial securing plate may be too weak to form.

Ein derartiges Axialsicherungsblech ist aus der US 2,786,648 und der US 4,102,602 bekannt. Die geschlitzten Enden des Bleches ragen dabei über die Enden der Nut hinaus. An jedem Ende sind die durch die Schlitze entstandenen Zähne jeweils wechselseitig nach außen und innen umgebogen, um eine axiale Verschiebung der Laufschaufel entlang der Nut zu vermeiden. Zudem ist dass Blech mittig gewölbt, um die Laufschaufel vorgespannt in der Nut zu halten.Such Axialsicherungsblech is from the US 2,786,648 and the US 4,102,602 known. The slotted ends of the sheet protrude beyond the ends of the groove. At each At the end, the teeth formed by the slots are each mutually outwardly and inwardly bent to avoid axial displacement of the blade along the groove. In addition, the sheet is curved in the middle, to keep the blade biased in the groove.

Des Weiteren ist aus der US 5,123,813 bekannt, anstelle des vorgenannten Bleches eine dübelartige Konstruktion mit einer Schraube zwischen dem Nutgrund der Haltenut und der Unterseite des Schaufelfußes zur Erzeugung der Vorspannung vorzusehen. Eine weitere Variante zeigt die Patentschrift DE 834 408 , bei der die Vorspanneinrichtung für Laufschaufeln einer Turbine mittels eines verschraubbaren Doppelkeils erzeugt wird, welcher zwischen Nutgrund und Schaufelfuß vorgesehen ist.Furthermore, from the US 5,123,813 known to provide a dowel-like construction with a screw between the groove bottom of the retaining groove and the underside of the blade root for generating the bias instead of the aforementioned sheet. Another variant shows the patent DE 834 408 in which the turbine rotor blade biasing means is produced by means of a screw-on double wedge provided between the groove base and the blade root.

Aus der DE 11 56 419 ist eine Befestigung der Schlussschaufel eines Schaufelkranzes bekannt, dessen Schaufeln in eine Umfangsnut mit hinterschnittenen Flanken durch eine Einfüllöffnung eingesetzt sind. Zur Befestigung der Schlussschaufel sind mehrere radiale Madenschrauben vorgesehen, die jeweils in ein Gewinde eingeschraubt werden, welches jeweils hälftig einerseits an einer Stirnseite des Schaufelfußes der Schlussschaufel angeordnet ist und andererseits in der Flanke der Einfüllöffnung. Gemäß einer alternativen Ausgestaltung ist es möglich Passstifte zu verwenden, die in hälftig vorhandene Bohrungen eingesetzt werden, die in den Stirnseiten der Schlussschaufel und den Stirnseiten derjenigen Laufschaufeln vorhanden sind, die an die Schlussschaufel angrenzt.From the DE 11 56 419 is a fastening of the end blade of a blade ring known, the blades are inserted into a circumferential groove with undercut flanks through a filling opening. For fastening the closing blade a plurality of radial grub screws are provided, which are each screwed into a thread, which is arranged in each case half on the one hand on an end face of the blade root of the closing blade and on the other hand in the flank of the filling opening. According to an alternative embodiment, it is possible to use dowel pins, which are used in half existing holes, which are present in the end faces of the closing blade and the end faces of those blades, which adjoins the closing blade.

Zu dem ist aus der GB 2 026 101 ein Befestigungsblech für eine axial in einer Haltenut eingeschobene Laufschaufel bekannt.To that is from the GB 2 026 101 a mounting plate for an axially inserted in a holding groove blade known.

Aufgabe der Erfindung ist es, einen Turbomaschinenrotor, eine Laufschaufel und ein Verfahren zum Zusammenbauen des Turbomaschinenmotors zu schaffen, wobei der Turbomaschinenrotor ohne Klappern der Laufschaufeln bei hoher Festigkeit und Effizienz betreibbar ist.The object of the invention is to provide a turbomachine rotor, a blade and a method for assembling the turbomachine engine, wherein the turbomachine rotor can be operated without rattling the blades with high strength and efficiency.

Der Turbomaschinenrotor weist entlang des Umfangs gleichmäßig verteilte Nuten, in denen jeweils eine Laufschaufel mit einem Schaufelfuß eingesetzt ist, so dass die Laufschaufel mit der Nut formschlüssig in Radialrichtung gehalten ist, und eine Vorspanneinrichtung auf, die sowohl an einem Nutgrund der Nut als auch an dem Schaufelfuß abgestützt ist und auf den Schaufelfuß eine Vorspannkraft in Radialrichtung ausübt, wobei die Vorspanneinrichtung derartig eingerichtet ist, dass die Vorspannkraft im Zusammenbauzustand des Turbomaschinenrotors einstellbar ist.The turbomachine rotor has along the circumference uniformly spaced grooves, in each of which a blade is inserted with a blade root, so that the blade is positively held with the groove in the radial direction, and a biasing device, both on a groove bottom of the groove and on the Paddle is supported and exerts on the blade root a biasing force in the radial direction, wherein the biasing means is arranged such that the biasing force is adjustable in the assembled state of the turbomachine rotor.

Dadurch ist es ermöglicht, dass beim Zusammenbauen des Turbomaschinenmotors, d.h. beim axialen Einschieben des Schaufelfußes in die Nut, die Vorspannkraft als gering vorgesehen ist und im Zusammenbauzustand des Turbinenmaschinenrotors die Vorspannkraft vorbestimmt hoch eingestellt wird. Somit ist vorteilhaft beim Einschieben des Schaufelfußes in die Nut die Vorspannkraft gering, so dass ein Verschleiß am Schaufelfuß und in der Nut auf Grund der Montage der Laufschaufel unterbunden ist.This makes it possible that when assembling the turbomachine engine, ie, when the axial insertion of the blade root in the groove, the biasing force is provided as low and in the assembled state of the turbine engine rotor, the biasing force is set to be predetermined high. Thus is advantageous when inserting the blade root into the groove, the biasing force low, so that wear on the blade root and in the groove is prevented due to the assembly of the blade.

Ferner ist vorteilhaft der Kraftaufwand beim Einschieben des Schaufelfußes in die Nut gering, so dass bei der Montage der Laufschaufel nur geringe Spannungsspitzen in dem Schaufelfuß und in der Radscheibe auftreten. Dadurch brauchen diese Spannungsspitzen bei der Festigkeitsauslegung des Schaufelfußes und des Turbomaschinenrotors so gut wie nicht berücksichtigt zu werden und die Montage der Laufschaufel in den Turbomaschinenrotor ist einfach.Further, the force required when inserting the blade root into the groove is advantageously low, so that only slight stress peaks occur in the blade root and in the wheel disk during assembly of the blade. As a result, these stress peaks in the strength design of the blade root and the turbomachine rotor as well as not to be considered and the mounting of the blade in the turbomachine rotor is simple.

Die Vorspanneinrichtung weist zudem mindestens eine Stellschraube auf, mit der durch Aufbringen eines vorbestimmten Anzugsmoments die Vorspannkraft im Zusammenbauzustand des Turbomaschinenrotors einstellbar ist.The biasing device also has at least one adjusting screw, with which by applying a predetermined tightening torque, the biasing force in the assembled state of the turbomachine rotor is adjustable.

Mittels der Stellschraube ist das Einstellen der vorbestimmten Vorspannkraft über die Vorgabe eines Anzugsmoments der Stellschraube ermöglicht. Dadurch ist die Vorspannkraft über das Anzugsmoment auf die Laufschaufel aufbringbar. Bevorzugt ist die Stellschraube mit einem Feingewinde versehen, so dass eine genaue Kraftübertragung der Stellschraube von dem Anzugsmoment auf die Vorspannkraft ermöglicht ist.By means of the adjusting screw is the setting of the predetermined biasing force on the specification of a torque of the screw allows. As a result, the preload force can be applied to the blade via the tightening torque. Preferably, the set screw is provided with a fine thread, so that an accurate power transmission of the screw is made possible by the tightening torque on the biasing force.

Ferner ist durch das Vorsehen der Stellschraube eine Demontage der Laufschaufel durch Lösen der Stellschraube ermöglicht, so dass die Demontage der Laufschaufel einfach ist. Somit ist eine materialschonende und schnelle Remontage der Laufschaufel ermöglicht.Furthermore, disassembly of the blade by loosening the screw is made possible by the provision of the screw, so that the disassembly of the blade is easy. Thus, a material-friendly and quick reassembly of the blade is possible.

Außerdem ist in dem Schaufelfuß mindestens ein Gewindeloch vorgesehen, das an der Schaufelfußunterseite dem Nutgrund der Nut zugewandt in diese mündet, wobei mindestens eine Stellschraube in das mindestens eine Gewindeloch so eingeschraubt ist, dass sie an dem Schaufelfuß mit ihrem Schraubenende vorsteht und indirekt an dem Nutgrund abgestützt ist.In addition, at least one threaded hole is provided in the blade root, which opens at the bottom of the blade root facing the groove bottom of the groove, wherein at least one screw in the at least one threaded hole so is screwed that it protrudes on the blade root with its screw end and is supported indirectly on the groove bottom.

Dadurch durchdringt die Stellschraube durch das Gewindeloch den Schaufelfuß und ist darin festgelegt, so dass durch die Abstützung des Schraubenendes indirekt an dem Nutgrund auf dem Schaufelfuß in Radialrichtung die Vorspannkraft aufgebracht wird.As a result, the adjusting screw penetrates the blade root through the threaded hole and is fixed therein, so that the prestressing force is applied indirectly to the groove bottom on the blade root in the radial direction by the support of the screw end.

Bevorzugtermaßen sind die entlang des Umfangs verteilten Nuten in einer Radscheibe des Turbomaschinenrotors angeordnet. Hierdurch kann ein modularer Turbomaschinenrotor angegeben werden.Preferably, the distributed along the circumference grooves are arranged in a wheel disc of the turbomachine rotor. As a result, a modular turbomachinery rotor can be specified.

Bevorzugt weist die Vorspanneinrichtung eine Abstützplatte auf, die auf dem Nutgrund mindestens im Bereich der einen Stellschraube angeordnet ist, so dass die Stellschraube und die Abstützplatte in Berührkontakt stehen.Preferably, the biasing means comprises a support plate which is arranged on the groove base at least in the region of an adjusting screw, so that the adjusting screw and the support plate are in touching contact.

Die Abstützplatte liegt direkt auf den Nutgrund in der Nut auf, so dass keine zusätzliche Nut im Nutgrund für die Abstützplatte vorgesehen zu werden braucht.The support plate is located directly on the groove bottom in the groove, so that no additional groove needs to be provided in the groove base for the support plate.

Ferner ist der Nutgrund im Bereich der Stellschraube von der Abstützplatte abgedeckt, so dass der Nutgrund nur im indirekten Kontakt via der Abstützplatte mit dem Schraubenende der Stellschraube steht. Somit ist es unterbunden, dass das Schraubenende der Stellschraube, insbesondere beim Drehen der Stellschraube, den Nutgrund beschädigt.Furthermore, the groove base is covered in the region of the adjusting screw of the support plate, so that the groove base is only in indirect contact via the support plate with the screw end of the screw. Thus, it is prevented that the end of the screw screw, especially when turning the screw damaged the groove bottom.

Ferner ist es bevorzugt, dass das mindestens eine Gewindeloch mit seinem der Schaufelfußunterseite abgewandten Ende an einer der Stirneseiten des Schaufelfußes nach außen mündet, so dass das Gewindeloch um einen spitzen Winkel von der Längsachse des Turbomaschinenrotors weg geneigt ist.Furthermore, it is preferable for the at least one threaded hole with its end remote from the blade root underside to open outward on one of the front sides of the blade root, so that the threaded hole is inclined at an acute angle away from the longitudinal axis of the turbomachine rotor.

Dadurch ist das Gewindeloch an der Stirnseite des Schaufelfußes zugänglich, so dass von dort die Stellschraube nach der Montage der Laufschaufel auf die Radscheibe eingestellt werden kann. Ferner, da das Gewindeloch von der Stirnseite des Schaufelfußes her zu dem Schaufelfußboden hin sich erstreckt, durchdringt das Gewindeloch den Schaufelfuß in einem mechanisch wenig belasteten Bereich. Dadurch ist durch das Vorsehen des Gewindelochs in dem Schaufelfuß dieser in seiner Festigkeit wenig beeinträchtigt.As a result, the threaded hole on the front side of the blade root is accessible, so that from there the adjusting screw are adjusted to the wheel disc after assembly of the blade can. Further, since the threaded hole extends from the end face of the blade root toward the blade root, the threaded hole penetrates the blade root in a mechanically little loaded area. This is little affected by the provision of the threaded hole in the blade root in its strength.

Auf Grund der Neigung der Stellschraube um den spitzen Winkel weist die von der Stellschraube aufgebrachte Vorspannkraft eine axiale und eine radiale Komponente auf. Dies ist vorteilhaft, da dadurch sowohl die radiale Vorspannkraft als auch eine axiale Kraft zum Arretieren der Laufschaufel in der Radscheibe aufgebracht wird. Dadurch ist sowohl eine radiale als auch eine axiale Befestigung der Laufschaufel gewährleistet. Über den Grad der Neigung der Stellschraube kann die Aufteilung der durch die Stellschraube übertragenen Kraft auf die axiale und radiale Befestigung aufgeteilt werden.Due to the inclination of the adjusting screw around the acute angle, the biasing force applied by the adjusting screw has an axial and a radial component. This is advantageous because it applies both the radial preload force and an axial force for locking the blade in the wheel disc. As a result, both a radial and an axial attachment of the blade is ensured. On the degree of inclination of the screw, the division of the force transmitted through the screw force can be divided into the axial and radial attachment.

Es ist bevorzugt, dass die Abstützplatte mindestens eine Kröpfung mit einer flächigen Flanke aufweist, die derart geformt ist, dass das Schraubenende der Stellschraube stirnseitig an der flächigen Flanke anliegt. Bevorzugt ist ebenfalls die Stirnseite des Schraubenendes der Stellschraube flächig ausgebildet, so dass beim flächigen Anliegen des Schraubenendes an der Flanke die Flächenpressung gering ist. Dadurch ist eine extreme mechanische Belastung der Abstützplatte von der Stellschraube unterbunden, wodurch eine unerwünschte Verwerfung der Abstützplatte auf Grund der Einwirkung der Stellschraube nicht auftritt, so dass ein Verklemmen der Stellschraube unterbunden ist.It is preferred that the support plate has at least one offset with a flat edge, which is shaped such that the end of the screw of the screw abuts the end face of the flat edge. Preferably, the end face of the screw end of the adjusting screw is also formed flat, so that when surface concerns of the screw end on the flank, the surface pressure is low. As a result, an extreme mechanical load on the support plate is prevented by the screw, whereby an undesirable rejection of the support plate due to the action of the screw does not occur, so that jamming the screw is prevented.

Bevorzugt ist, dass der Schaufelfuß ein erstes Gewindeloch mit einer ersten Stellschraube und ein zweites Gewindeloch mit einer zweiten Stellschraube aufweist, wobei das erste Gewindeloch an der einen Stirnseite und das zweite Gewindeloch an der anderen Stirnseite des Schaufelfußes nach außen mündet, so dass das erste Gewindeloch um einen ersten spitzen Winkel und das zweite Gewindeloch um einen zweiten spitzen Winkel von der Längsachse des Turbomaschinenrotors weggeneigt ist.It is preferred that the blade root has a first threaded hole with a first adjusting screw and a second threaded hole with a second adjusting screw, wherein the first threaded hole opens at one end side and the second threaded hole at the other end side of the blade root to the outside, so that the first threaded hole around a first acute angle and the second threaded hole about a second acute angle is inclined away from the longitudinal axis of the turbomachine rotor.

Dadurch sind die beiden Stellschrauben zueinander entgegengesetzt geneigt angeordnet, so dass die auf die Abstützplatte aufgebrachten axialen Kraftkomponenten einander entgegenwirken. Dadurch kann vorteilhaft eine stabile Befestigung des Schaufelfußes in der Nut erzielt werden, wobei auf den Schaufelfuß eine geringe bis gar keine resultierende axiale Kraft wirkt.As a result, the two setscrews are mutually oppositely inclined, so that the force applied to the support plate axial force components counteract each other. As a result, a stable attachment of the blade root in the groove can advantageously be achieved, with little or no resulting axial force acting on the blade root.

Außerdem ist es bevorzugt, dass die Abstützplatte die erste Kröpfung mit der ersten Flanke, an der das Schraubenende der ersten Stellschraube anliegt, und die zweite Kröpfung mit der zweiten Flanke aufweist, an der das Schraubenende der zweiten Schraube anliegt.In addition, it is preferred that the support plate has the first offset with the first flank on which abuts the screw end of the first screw, and the second crank with the second flank against which abuts the screw end of the second screw.

Somit ist die Laufschaufel an ihrem Schaufelfuß via den Stellschrauben an den Flanken der Kröpfungen der Abstützplatte in Axialrichtung formschlüssig arretiert.Thus, the blade is locked at its blade root via the screws on the flanks of the cranks of the support plate in the axial direction positively.

Bevorzugt ist, dass der erste Winkel und der zweite Winkel denselben Betrag haben.It is preferred that the first angle and the second angle have the same amount.

Dadurch ist die Vorspanneinrichtung in der Ebene senkrecht zur Axialrichtung des Turbomaschinenrotors symmetrisch ausgebildet, so dass die Verteilung der Vorspannkräfte in der Vorspanneinrichtung symmetrisch ist. Somit sind die Vorspanneinrichtung, der Schaufelfuß und die Radscheibe ausgeglichen beansprucht.Thereby, the biasing means in the plane perpendicular to the axial direction of the turbomachine rotor is formed symmetrically, so that the distribution of the biasing forces in the biasing means is symmetrical. Thus, the biasing device, the blade root and the wheel are claimed balanced.

Ferner ist es bevorzugt, dass die Abstützplatte zwischen den beiden Kröpfungen einen Rückenabschnitt aufweist, der mit seiner konvexen Seite dem Schaufelfuß zugewandt ist.Furthermore, it is preferred that the support plate between the two cranks has a back portion which faces the blade root with its convex side.

Bevorzugt ist die Abstützplatte aus einem elastischen Material hergestellt. Hervorgerufen durch die Vorspannkräfte, die von den Stellschrauben auf die Flanken der Kröpfungen ausgeübt werden, werden diese in Richtung zum Nutgrund gedrückt. Dadurch wird der Rückenabschnitt gekrümmt, so dass der Rückenabschnitt mit seiner konvexen Seite auf die Schaufelfußunterseite drückt. Dadurch werden die Vorspannkräfte, die die Stellschrauben auf die Abstützplatte ausüben, auf den Schaufelfuß übertragen. Somit ist die Vorspannung der Laufschaufel erhöht.Preferably, the support plate is made of an elastic material. Caused by the preload forces exerted by the set screws on the flanks of the cranks These are pressed in the direction of the groove bottom. As a result, the back portion is curved, so that the back portion presses with its convex side on the blade root underside. As a result, the biasing forces that exert the set screws on the support plate, transferred to the blade root. Thus, the bias of the blade is increased.

Außerdem ist es bevorzugt, dass der Rückenabschnitt vor seiner Montage vorgekrümmt ist, so dass der Rückenabschnitt im Zusammenbauzustand des Turbomaschinenmotors auf die Schaufelfußunterseite drückt.In addition, it is preferable that the back portion is pre-curved prior to its mounting, so that the back portion in the assembled state of the turbomachine engine presses on the blade root lower side.

Dadurch hat die Abstützplatte eine Federwirkung in Richtung zu der Schaufelfußunterseite, wodurch eine Vorspannreserve für den Fall des Setzens, d.h., wenn sich im Betrieb der Abstand zwischen der Schaufelfußunterseite und dem Nutgrund vergrößert, geschaffen ist. Ferner ermöglicht die Vorkrümmung des Rückenabschnitts im Zusammenbauzustand einen guten Kraftschluss über den mit den Stellschrauben ausgebildeten Flächenkontakt. Über die Steifigkeit und die Dicke der Abstützplatte kann die Vorspannreserve vordefiniert werden. Durch Verstellen der Stellschrauben kann die Vorspannreserve im Zusammenbauzustand noch variiert werden.As a result, the support plate has a spring action in the direction of the blade root lower side, whereby a Vorspannreserve in the case of setting, that is, when in operation increases the distance between the Schaufelfußunterseite and the groove bottom is created. Furthermore, the pre-curvature of the back portion in the assembled state allows a good adhesion over the surface contact formed with the set screws. About the stiffness and the thickness of the support plate, the Vorspannreserve can be predefined. By adjusting the set screws, the preload reserve in the assembled state can still be varied.

Bevorzugt ist, dass die Abstützplatte an der ersten Kröpfung einen von dem Rückenabschnitt sich weg erstreckenden ersten Schenkelabschnitt und an der zweiten Kröpfung einen von dem Rückenabschnitt sich weg erstreckenden zweiten Schenkelabschnitt aufweist.It is preferred that the support plate has at the first offset a first leg portion extending away from the back portion and at the second crank a second leg portion extending away from the back portion.

Dadurch ist erreicht, dass die Abstützplatte flächig und so mit geringer Flächenpressung auf dem Nutgrund abgestützt ist.This ensures that the support plate is supported flat and so with low surface pressure on the groove bottom.

Bevorzugt weist der erste Schenkelabschnitt einen ersten Überstand und der zweite Schenkelabschnitt einen zweiten Überstand auf, wobei die Überstände aus der Nut über die Randscheibe hinaus ragen.Preferably, the first leg section has a first projection and the second leg section has a second projection, wherein the projections protrude out of the groove beyond the edge plate.

Dadurch ist die Abstützplatte im Zusammenbauzustand von außen mit den Überständen greifbar, so dass eine Demontage und Remontage der Laufschaufel einfach durchführbar ist.As a result, the support plate is in the assembled state from the outside tangible with the supernatants, so that disassembly and reassembly of the blade is easy to carry out.

Ferner ist es bevorzugt, dass die Überstände abgewinkelt zu den Schenkelabschnitten angeordnet sind, so dass der Turbomaschinenrotor oder die Radscheibe mit der Abstützplatte in Eingriff steht und dadurch in Axialrichtung des Turbomaschinenrotors festgehalten ist.Further, it is preferable that the projections are arranged angled to the leg portions, so that the turbomachine rotor or the wheel disc is engaged with the support plate and thereby held in the axial direction of the turbomachine rotor.

Dadurch ist die Abstützplatte an der Radscheibe in Axialrichtung befestigt, insbesondere auch dann, wenn beim Zusammenbauen des Turbomaschinenrotors die Laufschaufel noch nicht in die Nut der Radscheibe eingesetzt ist. Somit muss beim Zusammenbauen des Turbomaschinenrotors die in die Nut auf den Nutgrund gelegte Abstützblatte von außen nicht festgehalten werden, wenn in die Nut der Laufschaufelfuß eingeschoben wird. Bevorzugt kann der Überstand umgebogen oder überschlagen werden.As a result, the support plate is fixed to the wheel disc in the axial direction, in particular, even when the rotor blade is not yet inserted into the groove of the wheel disc during assembly of the turbomachine rotor. Thus, when assembling the turbomachinery rotor, the support blade placed in the groove on the groove bottom need not be retained from the outside when the blade root is inserted into the groove. Preferably, the supernatant can be bent or rolled over.

Bevorzugt, ist es, dass die mindestens eine Stellschraube mit einem Sicherungsmittel gegen unbeabsichtigtes Verdrehen gesichert ist.It is preferred that the at least one adjusting screw is secured against unintentional rotation by a securing means.

Dadurch ist unterbunden, dass die Stellschraube sich im Betrieb des Turbomaschinenrotors versehentlich löst. Das Sicherungsmittel kann bevorzugt ein Klebstoff sein. Alternativ oder zusätzlich hierzu kann die Stellschraube mit einem Körnerschlag in der Laufschaufel verstemmt werden.This prevents the adjusting screw from being accidentally released during operation of the turbomachine rotor. The securing means may preferably be an adhesive. Alternatively or additionally, the set screw can be caulked with a grain impact in the blade.

Die geometrische Dimensionierung der Abstützplatte, der Stellschrauben und des Anzugsmoments ist auf die Masse der Laufschaufel anzupassen.The geometric dimensions of the support plate, the set screws and the tightening torque must be adapted to the mass of the blade.

Die erfindungsgemäße Laufschaufel, welche zur Montage in eine am Außenumfang eines Turbomaschinenrotors befindliche, sich in Axialrichtung erstreckende Nut vorgesehen ist, weist einen Schaufelfuß mit zwei einander gegenüberliegenden und senkrecht zur Längsachse des Schaufelfußes angeordneten Stirnseiten und einer sich zwischen den beiden Stirnseiten erstreckenden Schaufelfußunterseite auf, wobei der Schaufelfuß ein erstes Gewindeloch und ein zweites Gewindeloch aufweist, wobei die beiden Gewindelöcher einerseits an der Schaufelfußunterseite nach außen münden, sowie andererseits das erste Gewindeloch an der einen Stirnseite und das zweite Gewindeloch an der anderen Stirnseite das Schaufelfußes nach außen münden, so dass das erste Gewindeloch um einen ersten spitzen Winkel und das zweite Gewindeloch um einen zweiten spitzen Winkel von der Längsachse das Turbomaschinenrotors weggeneigt ist.The moving blade according to the invention, which is intended to be mounted in an axially extending groove on the outer circumference of a turbomachinery rotor, has a Blade root with two opposite and arranged perpendicular to the longitudinal axis of the blade root end faces and extending between the two end faces of the blade root, the blade root having a first threaded hole and a second threaded hole, the two threaded holes open on the one hand on the blade root bottom to the outside, and on the other the first threaded hole at one end face and the second threaded hole at the other end side open the blade root to the outside so that the first threaded hole is inclined at a first acute angle and the second threaded hole is inclined at a second acute angle from the longitudinal axis of the turbomachine rotor.

Die Abstützplatte zum Vorspannen einer Laufschaufel eines Turbomaschinenrotors hat eine Längsrichtung und weist entlang dieser angeordnet zwei gegensinnige Kröpfungen mit jeweils einer ebenflächigen Flanke auf, zwischen denen die Abstützplatte einen Rückenabschnitt aufweist.The support plate for biasing a blade of a turbomachinery rotor has a longitudinal direction and has along this two opposing cranks, each with a planar edge, between which the support plate has a back portion.

Das erfindungsgemäße Verfahren zum Zusammenbauen eines Turbomaschinenrotors weist auf die Schritte: Bereitstellen des Turbomaschinenrotors mit entlang des Umfangs verteilten Nuten, welche sich wesentlich in Axialrichtung des Turbomaschinenrotors erstrecken und mit jeweils darin angeordneten Laufschaufeln und mit einer Abstützplatte; Einschieben der Laufschaufel in die Nut, so dass der Schaufelfuß in die Nut eingreift und so die Laufschaufel in der Nut formschlüssig in Radialrichtung gehalten ist; Einschieben der Abstützplatte in die Nut zwischen der Schaufelfußunterseite und dem Nutgrund; Einschrauben von der ersten Stellschraube in das erste Gewindeloch und der zweiten Stellschraube in das zweite Gewindeloch, bis die Stellschrauben ihre korrespondierenden Kröpfungen berühren; Anziehen der beiden Stellschrauben mit einem vorbestimmten Anzugsmoment, um die Laufschaufel in Radialrichtung mit einer vorbestimmten Vorspannkraft in der Nut vorzuspannen.The method of assembling a turbomachinery rotor according to the invention comprises the steps of: providing the turbomachinery rotor with circumferentially distributed grooves extending substantially in the axial direction of the turbomachine rotor and having blades therein and a support plate; Inserting the blade into the groove, so that the blade root engages in the groove and so the blade is held in the groove form-fitting in the radial direction; Inserting the support plate in the groove between the blade root bottom and the groove bottom; Threading the first set screw into the first threaded hole and the second set screw into the second threaded hole until the set screws contact their corresponding cranks; Tightening the two set screws with a predetermined tightening torque to bias the blade in the radial direction with a predetermined biasing force in the groove.

Im Folgenden wird ein bevorzugtes Ausführungsbeispiel eines erfindungsgemäßen Turbomaschinenrotors und einer Abstützplatte anhand der beigefügten schematischen Zeichnungen erläutert.In the following, a preferred embodiment of a turbomachinery rotor according to the invention and a support plate will be explained with reference to the accompanying schematic drawings.

Es zeigt:

Figur 1
einen Querschnitt durch den Turbomaschinenrotor im Bereich eines Schaufelfußes,
Figur 2
einen Längsschnitt des Turbomaschinenrotors im Bereich des Schaufelfußes,
Figur 3
eine Abstützplatte im Nichteinbauzustand,
Figur 4
die Abstützplatte im Einbauzustand.
It shows:
FIG. 1
a cross section through the turbomachine rotor in the region of a blade root,
FIG. 2
a longitudinal section of the turbomachine rotor in the region of the blade root,
FIG. 3
a support plate in the non-installed state,
FIG. 4
the support plate in the installed state.

Wie es aus den Figuren 1 und 2 ersichtlich ist, weist ein Turbinenmaschinenrotor 1 eine Mehrzahl von Laufschaufeln 2 und eine Radscheibe 16 auf. Die Laufschaufeln 2 sind an dem Umfang der Radscheibe 16 befestigt, so dass eine Rotorstufe des Turbomaschinenrotors 1 gebildet ist.As it is from the Figures 1 and 2 As can be seen, a turbine engine rotor 1 has a plurality of rotor blades 2 and a wheel disk 16. The rotor blades 2 are attached to the circumference of the wheel disc 16, so that a rotor stage of the turbomachine rotor 1 is formed.

Die Laufschaufel 2 ist einstückig hergestellt und weist ein Schaufelblatt 3 und einen Schaufelfuß 4 auf. Das Schaufelblatt 3 ist aerodynamisch wirksam, beispielsweise in einem Verdichter oder einer Turbine einer Turbomaschine. Der Schaufelfuß 4 dient zur Befestigung des Schaufelblatts 3 an der Radscheibe 16.The blade 2 is made in one piece and has an airfoil 3 and a blade root 4. The blade 3 is aerodynamically effective, for example in a compressor or a turbine of a turbomachine. The blade root 4 serves for fastening the blade 3 to the wheel disc 16.

Der Schaufelfuß 4 weist in einer Ebene, die zur Drehachse des Turbomaschinenrotors senkrecht steht, einen tannenbaumprofilförmigen Querschnitt und in einer Ebene, in der die Drehachse des Turbomaschinenrotors liegt, einen rechteckigen Querschnitt auf. Der rechteckige Querschnitt des Schaufelfußes 4 ist gebildet von einer Längsseite, an die das Schaufelblatt 3 angrenzt, zwei einander sich abgewandten Stirnseiten, die jeweils senkrecht zur Drehachse des Turbomaschinenrotors 1 stehen, und einer Schaufelfußunterseite 15, die im wesentlichen parallel zur Drehachse des Turbomaschinenrotors 1 und dem Schaufelblatt 3 abgewendet angeordnet ist. In den Eckbereichen des Schaufelfußes 4, die im Bereich der von den Stirnseiten und der Schaufelfußunterseite 15 gebildeten Kanten liegen, weist der Schaufelfuß 4 mechanisch wenig belastete Bereiche 5 und 6 auf.The blade root 4 has in a plane which is perpendicular to the axis of rotation of the turbomachine rotor, a fir-tree profile-shaped cross-section and in a plane in which the axis of rotation of the turbomachine rotor is located, a rectangular cross-section. The rectangular cross section of the blade root 4 is formed by a longitudinal side, adjacent to the blade 3, two mutually remote end faces, each are perpendicular to the axis of rotation of the turbomachine rotor 1, and a blade root bottom 15, which is arranged substantially parallel to the axis of rotation of the turbomachinery rotor 1 and the blade 3 is disposed. In the corner regions of the blade root 4, which lie in the region of the edges formed by the end faces and the blade root underside 15, the blade root 4 has regions 5 and 6 which are under little mechanical loading.

Der erste mechanisch wenig belastete Bereich 5 des Schaufelfußes 4 ist von einem ersten Gewindeloch 7 und der zweite mechanisch wenig belastete Bereich 6 des Schaufelfußes 4 ist von einem zweiten Gewindeloch 8 durchdrungen, wobei die beiden Gewindelöcher 7, 8 an der Schaufelfußunterseite 15 nach außen münden und das erste Gewindeloch 7 an der einen Stirnseite des Schaufelfußes 4 und das zweite Gewindeloch 8 an der anderen Stirnseite des Schaufelfußes 4 nach außen münden. In das erste Gewindeloch 7 ist eine erste Stellschraube 9 und in das zweite Gewindeloch 8 ist eine zweite Stellschraube 10 eingeschraubt. Die erste Stellschraube 9 weist ein erstes Schraubenende 11 und die zweite Stellschraube 10 weist ein zweites Schraubenende 12 auf, wobei die Schraubenenden 11, 12 jeweils an der Schaufelfußunterseite 15 außerhalb des Schaufelfußes 4 angesiedelt sind.The first mechanically little loaded area 5 of the blade root 4 is of a first threaded hole 7 and the second mechanically little loaded area 6 of the blade root 4 is penetrated by a second threaded hole 8, the two threaded holes 7, 8 open at the blade root bottom 15 to the outside and the first threaded hole 7 open at the one end face of the blade root 4 and the second threaded hole 8 at the other end face of the blade root 4 to the outside. In the first threaded hole 7 is a first screw 9 and in the second threaded hole 8, a second screw 10 is screwed. The first adjusting screw 9 has a first screw end 11 and the second adjusting screw 10 has a second screw end 12, wherein the screw ends 11, 12 are each located on the blade root bottom side 15 outside of the blade root 4.

Die beiden Gewindelöcher 7, 8 sowie die beiden Stellschrauben 9, 10 sind gegeneinander verschwenkt angeordnet, so dass das erste Gewindeloch 7 mit der Drehachse des Turbomaschinenrotors 1 einen ersten Winkel 13 und das zweite Gewindeloch 8 mit der Drehachse des Turbomaschinenrotors 1 einen zweiten Winkel 14 einschließt. Die beiden Gewindelöcher 7, 8 sind zueinander derart angeordnet, dass die beiden Schraubenenden 11, 12 der beiden Stellschrauben 9, 10 einander zugewandt angeordnet sind. Jeweils der erste Winkel 13 und der zweite Winkel 14 sind spitze Winkel und im Betrag gleich groß.The two threaded holes 7, 8 and the two adjusting screws 9, 10 are arranged pivoted against each other, so that the first threaded hole 7 with the axis of rotation of the turbomachine rotor 1 a first angle 13 and the second threaded hole 8 with the axis of rotation of the turbomachine rotor 1 includes a second angle 14 , The two threaded holes 7, 8 are arranged to each other such that the two screw ends 11, 12 of the two screws 9, 10 are arranged facing each other. In each case, the first angle 13 and the second angle 14 are acute angle and the same amount.

Die Radscheibe 16 weist eine Nut 17 mit einem Nutgrund 18 auf, die mit dem Schaufelfuß 4 in Eingriff steht. Die Form der Nut 17 ist derart ausgebildet, dass sie die Längsseiten des Schaufelfußes 4 und die Schaufelfußunterseite 15 formschlüssig umschließt, so dass die Laufschaufel 2 mittels des Tannenbaumprofils des Schaufelfußes 4 in der Nut 17 in Radialrichtung und in Umfangsrichtung des Turbomaschinenrotors 1 formschlüssig gehalten ist. Die Nut 17 und der Schaufelfuß 4 sind derart ausgebildet, dass bei der Montage des Turbomaschinenrotors 1 die Laufschaufel 2 mit ihrem Schaufelfuß 4 im Wesentlichen in Axialrichtung des Turbomaschinenrotors 1 einschiebbar ist. Beim zusammengebauten Turbomaschinenrotor 1 schließen die Stirnseiten des Schaufelfußes 4 im Wesentlichen plan mit den Stirnseiten der Radscheibe 16 ab.The wheel disc 16 has a groove 17 with a groove bottom 18, which is in engagement with the blade root 4. Form the groove 17 is formed such that it encloses the longitudinal sides of the blade root 4 and the Schaufelfußunterseite 15 positively, so that the blade 2 is held by means of the Christmas tree profile of the blade root 4 in the groove 17 in the radial direction and in the circumferential direction of the turbomachine rotor 1 positively. The groove 17 and the blade root 4 are formed such that during assembly of the turbomachine rotor 1, the blade 2 with its blade root 4 substantially in the axial direction of the turbomachine rotor 1 is inserted. In the assembled turbomachine rotor 1, the end faces of the blade root 4 are substantially flush with the end faces of the wheel disc 16.

Die Nut 17 ist derart dimensioniert, dass zwischen dem Nutgrund 18 und der Schaufelfußunterseite 15 ein Spalt ausgebildet ist. In den Spalt ist eine Abstützplatte 19 eingesetzt, die in ihrer Mitte einen Rückenabschnitt 20 aufweist, der von einer ersten Kröpfung 21 und einer zweiten Kröpfung 22 gebildet ist. An die erste Kröpfung 21 schließt sich ein erster Schenkelabschnitt 25 und an die zweite Kröpfung 22 schließt sich ein zweiter Schenkelabschnitt 26 an, wobei die Schenkelabschnitte 25, 26 an dem Nutgrund 18 anliegen und der Rückenabschnitt 20 an der Schaufelfußunterseite 15 anliegt. Der Rückenabschnitt 20 und die Schenkelabschnitte 25, 26 sind miteinander fluchtend angeordnet.The groove 17 is dimensioned such that between the groove bottom 18 and the blade root bottom 15 a gap is formed. In the gap, a support plate 19 is inserted, which has in its center a back portion 20 which is formed by a first crank 21 and a second crank 22. A first leg section 25 adjoins the first offset 21 and a second leg section 26 adjoins the second offset 22, wherein the leg sections 25, 26 rest against the groove base 18 and the back section 20 rests against the underside of the blade foot 15. The back portion 20 and the leg portions 25, 26 are arranged in alignment with each other.

Die erste Kröpfung 21 weist eine erste Flanke 23 und die zweite Kröpfung 22 weist eine zweite Flanke 24 auf, wobei das erste Schraubenende 11 an der ersten Kröpfung 21 und das zweite Schraubenende 12 an der zweiten Kröpfung 24 anliegt. Sowohl das erste Schraubenende 11 als auch die erste Flanke 23 sowie das zweite Schraubenende 12 als auch die zweite Flanke 24 sind ebenflächig ausgebildet, so dass der Kontakt zwischen den Stellschrauben 10, 11 und der Abstützplatte 19 über eine Kontaktfläche hergestellt ist.The first offset 21 has a first flank 23 and the second offset 22 has a second flank 24, the first screw end 11 abutting the first crank 21 and the second screw end 12 abutting the second crank 24. Both the first end of the screw 11 and the first edge 23 and the second end of the screw 12 and the second edge 24 are formed planar, so that the contact between the screws 10, 11 and the support plate 19 is made via a contact surface.

Die beiden Stellschrauben 9, 10 sind derart in ihren Gewindelöchern 7, 8 eingeschraubt und mit einem vorbestimmten Anzugsmoment angezogen, so dass von den Stellschrauben 9, 10 auf die Flanken 23, 24 und somit auf die Abstützplatte 19 jeweils eine vorbestimmte Kraft ausgeübt wird. Die Kraft hat eine Radialkomponente und eine Axialkomponente, wobei, wenn die beiden Stellschrauben 9, 10 mit demselben Anzugsmoment angezogen sind, die Axialkomponenten einander aufheben. Die Radialkomponenten bilden eine vorbestimmte Vorspannkraft, mit der der Schaufelfuß 4 in der Nut 17 vorbestimmt vorgespannt wird.The two screws 9, 10 are screwed in their threaded holes 7, 8 and with a predetermined torque tightened, so that in each case a predetermined force is exerted by the set screws 9, 10 on the flanks 23, 24 and thus on the support plate 19. The force has a radial component and an axial component, wherein when the two setscrews 9, 10 are tightened with the same tightening torque, the axial components cancel each other. The radial components form a predetermined biasing force with which the blade root 4 is pre-biased in the groove 17 predetermined.

An dem ersten Schenkelabschnitt 25 ist ein erster Überstand 27 und an dem zweiten Schenkelabschnitt 26 ist ein zweiter Überstand 28 vorgesehen, wobei sich die Überstände 27, 28 aus der Nut 17 heraus über die Radscheibe 16 hinweg erstrecken. Die beiden Überstände 27, 28 sind in Richtung zur Mitte des Turbomaschinenrotors 1 zu den Schenkelabschnitten 25, 26 abgewinkelt angeordnet, so dass mit den Überständen 27, 28 die Abstützplatte 19 auf dem Nutgrund 18 liegend in Axialrichtung des Turbomaschinenrotors 1 fixiert angeordnet ist.On the first leg portion 25, a first projection 27 and on the second leg portion 26, a second projection 28 is provided, wherein the projections 27, 28 extend out of the groove 17 on the wheel disc 16 away. The two projections 27, 28 are arranged angled towards the center of the turbomachine rotor 1 to the leg portions 25, 26, so that with the projections 27, 28, the support plate 19 is arranged fixed on the groove bottom 18 in the axial direction of the turbomachine rotor 1.

In Figuren 3 und 4 ist die Abstützplatte 19 gezeigt, wobei der erste Überstand 27 als Verlängerung des ersten Schenkelabschnitts 25 und der zweite Überstand 28 als Verlängerung des zweiten Schenkelabschnitts 26 angeordnet sind.In FIGS. 3 and 4 the support plate 19 is shown, wherein the first projection 27 as an extension of the first leg portion 25 and the second projection 28 are arranged as an extension of the second leg portion 26.

In Figur 3 ist die Abstützplatte 19 im unmontierten Zustand und in Figur 4 im montierten Zustand gezeigt. Die Abstützplatte 19 ist vorgekrümmt gefertigt, so dass die Abstützplatte 19 im unmontierten Zustand eine konvexe Kontur hat. Ist die Abstützplatte 19, so wie es in der Figur 4 gezeigt ist, in die Nut 17 zusammen mit dem Schaufelfuß 4 eingebaut, so wird die Abstützplatte 19 gerade gedrückt, so dass die Abstützplatte 19 auf Grund von Federeigenschaften eine Federkraft auf den Schaufelfuß 4 ausübt.In FIG. 3 is the support plate 19 in the unmounted state and in FIG. 4 shown in the assembled state. The support plate 19 is pre-curved, so that the support plate 19 in the unassembled state has a convex contour. Is the support plate 19, as it is in the FIG. 4 is shown, installed in the groove 17 together with the blade root 4, the support plate 19 is pressed straight, so that the support plate 19 exerts a spring force on the blade root 4 due to spring characteristics.

Bei einem Verfahren zum Zusammenbauen des Turbinenmaschinenrotors 1 wird die Laufschaufel 2 in die Nut 17 im Wesentlichen in die Axialrichtung des Turbomaschinenrotors 1 eingeschoben, bis die Stirnseiten des Schaufelfußes 4 mit den Stirnseiten der Radscheibe 16 fluchtend angeordnet sind. In dem zwischen der Schaufelfußunterseite 15 und dem Nutgrund 18 ausgebildeten Spalt wird die Abstützplatte 19 gemäß der in Figur 3 gezeigten Ausführungsform geschoben, bis die beiden Überstände 27 und 28 von der Radscheibe 16 vorstehen. Dann wird die erste Stellschraube 9 in das erste Gewindeloch 7 und die zweite Stellschraube 12 in das zweite Gewindeloch 8 eingeschraubt, bis das erste Schraubenende 10 die erste Flanke 23 und das zweite Schraubenende 12 die zweite Flanke 24 berühren. Im Folgenden werden die Stellschrauben 9, 10 mit dem vorbestimmten Anzugsmoment angezogen. Dann werden die Überstände 27 und 28 in Richtung zu der Mitte der Radscheibe 16 gebogen, so dass die Überstände 27, 28 an der Radscheibe anliegen. In a method of assembling the turbine engine rotor 1, the blade 2 is inserted into the groove 17 substantially in the axial direction of the turbomachine rotor 1 inserted until the end faces of the blade root 4 are arranged in alignment with the end faces of the wheel disc 16. In the gap formed between the blade root lower side 15 and the groove bottom 18, the support plate 19 according to the in FIG. 3 shown embodiment pushed until the two projections 27 and 28 project from the wheel disc 16. Then, the first screw 9 is screwed into the first threaded hole 7 and the second screw 12 in the second threaded hole 8 until the first end of the screw 10, the first edge 23 and the second end of the screw 12, the second edge 24 touch. In the following, the screws 9, 10 are tightened with the predetermined torque. Then, the projections 27 and 28 are bent in the direction of the center of the wheel disc 16, so that the projections 27, 28 abut against the wheel disc.

Claims (17)

  1. Turbomachine rotor (1),
    with grooves (17) which are distributed along the periphery and extend essentially in the axial direction of the turbomachine rotor (1), and
    with a rotor blade (2) which is arranged therein in each case, the blade root (4) of which engages in one of the grooves (17) in each case,
    so that the rotor blade (2) is retained in the groove (17) in a form-fitting manner in the radial direction,
    and with a pretensioning device (7 - 14, 19 - 28) which is supported both on a bottom (18) of the groove (17) and on the blade root (4) and exerts a pretensioning force upon the blade root (4) in the radial direction,
    wherein the pretensioning device (7 - 14, 19 - 28) is installed in such a way that the pretensioning force is adjustable in the assembled state of the turbomachine rotor (1), wherein the pretensioning device (7 - 14, 19 - 28) has at least one adjusting screw (10, 11), with which by applying a predetermined tightening torque the pretensioning force is adjustable in the assembled state of the turbomachine rotor (1),
    characterized in that
    provision is made in the blade root (4) for at least one threaded hole (7, 8) which on the underside (15) of the blade root, facing the bottom (18) of the groove (17), leads into this, and wherein the at least one adjusting screw (9, 10) is screwed into the at least one threaded hole (7, 8) so that it projects on the blade root (4) by its end (11, 12) and is indirectly supported on the bottom (18) of the groove.
  2. Turbomachine rotor (1) according to Claim 1,
    in which the grooves (17) which are distributed along the periphery are arranged in a wheel disk (16).
  3. Turbomachine rotor (1) according to Claim 1 or 2,
    wherein the pretensioning device (7 - 14, 19 - 28) has a support plate (19) which is arranged on the bottom (18) of the groove at least in the region of the one adjusting screw (9, 10) so that the adjusting screw (9, 10) is in touching contact with the support plate (19).
  4. Turbomachine rotor (1) according to Claim 1, 2 or 3,
    wherein the at least one threaded hole (7, 8), by its end which faces away from the underside (15) of the blade root, leads out on one of the end faces of the blade root (4) so that the threaded hole (7, 8) is inclined away from the longitudinal axis of the turbomachine rotor (1) by an acute angle (13, 14).
  5. Turbomachine rotor (1) according to Claim 4,
    wherein the support plate (19) has at least one offset (21, 22) with a flank (23, 24), which is formed in such a way that the end (11, 12) of the adjusting screw (9, 10) butts by its end face flat against the flank (23, 24).
  6. Turbomachine rotor (1) according to Claim 4 or 5,
    wherein the blade root (4) has a first threaded hole (7) with a first adjusting screw (9) and a second threaded hole (8) with a second adjusting screw (10),
    wherein the first threaded hole (7) leads out on the one end face of the blade root (4) and the second threaded hole (8) leads out on the other end face so that the first threaded hole (7) is inclined away from the longitudinal axis of the turbomachine rotor (1) by a first acute angle (13) and the second threaded hole (8) is inclined away by a second acute angle (14).
  7. Turbomachine rotor (1) according to Claim 6,
    wherein the support plate (19) has the first offset (21) with the first flank (23), against which butts the end (11) of the first adjusting screw (9), and the second offset (22) with the second flank (24), against which butts the end (12) of the second adjusting screw (10).
  8. Turbomachine rotor (1) according to Claim 6 or 7,
    wherein the first angle (13) and the second angle (14) have the same value.
  9. Turbomachine rotor (1) according to Claim 8,
    wherein the support plate (19) has a back section (20) between the two offsets (21, 22), which by its convex side faces the blade root (4).
  10. Turbomachine rotor (1) according to Claim 9,
    wherein the back section (20) is pre-bent before its installation so that in the assembled state of the turbomachine rotor (1) the back section (20) presses onto the underside (15) of the blade root.
  11. Turbomachine rotor (1) according to Claim 9 or 10,
    wherein on the first offset (21) the support plate (19) has a first leg section (25) which extends away from the back section (20) and on the second offset (22) has a second leg section (26) which extends away from the back section (20).
  12. Turbomachine rotor (1) according to Claim 11,
    wherein the first leg section (25) has a first projection (27) and the second leg section (26) has a second projection (28),
    wherein the projections (27, 28) project from the groove (17).
  13. Turbomachine rotor (1) according to Claim 12,
    wherein the projections (27, 28) are arranged in an angled-down manner in relation to the leg sections (25, 26) so that the turbomachine rotor (1) is in engagement with the support plate (19) and consequently is fixed in the axial direction of the turbomachine rotor (1).
  14. Turbomachine rotor (1) according to one of Claims 1 to 13,
    wherein the at least one adjusting screw (9, 10) is secured against inadvertent rotation by a securing means.
  15. Rotor blade (2) with a blade root (4) which, for installing the rotor blade (2), can be inserted into a groove (17) located on the outer periphery of a turbomachine rotor (1), and which has two end faces, which are arranged opposite each other and arranged perpendicularly to the longitudinal axis of the blade root (4), and a blade root underside (15) which extends between the two end faces, characterized in that
    the blade root (4) has a first threaded hole (7) and a second threaded hole (8),
    wherein the two threaded holes (7, 8) lead out on the underside (15) of the blade root on one side, and on the other side the first threaded hole (7) leads out on the one end face of the blade root (4) and the second threaded hole (8) leads out on the other end face.
  16. Rotor blade according to Claim 15,
    wherein the first threaded hole (7) is inclined away from the longitudinal axis of the turbomachine rotor by a first acute angle (13) and the second threaded hole (8) is inclined away by a second acute angle (14), and the first angle (13) and the second angle (14) have the same value.
  17. Method for assembling a turbomachine rotor (1), featuring the steps:
    - Providing a turbomachine rotor (1) with grooves (17) which are distributed along the periphery and extend essentially in the axial direction of the turbomachine rotor (1), and with rotor blades (2), according to Claim 15 or 16, which can be inserted therein, and with a support plate (19) which has a longitudinal direction and has two opposed offsets (21, 22), which are arranged along this, with a planar flank (23, 24) in each case, between which the support plate (19) has a back section (20),
    - Inserting the rotor blade (2) into the groove (17) so that the blade root (4) engages in the groove (17) and so the rotor blade (2) is retained in a form-fitting manner in the groove (17) in the radial direction of the turbomachine rotor (2);
    - Inserting the support plate (19) into the groove (17) between the underside (15) of the blade root and the bottom (18) of the groove;
    - Screwing of a first adjusting screw (10) into the first threaded hole (7) and screwing a second adjusting screw (10) into the second threaded hole (8) until the adjusting screws (9, 10) contact their corresponding offsets (21, 22);
    - Tightening down the two adjusting screws (9, 10) with a predetermined tightening torque in order to pretension the rotor blade (2) in the groove (17) in the radial direction with a predetermined pretensioning force.
EP09709892A 2008-02-14 2009-01-23 Turbomachine rotor, rotor blade for such a turbomachine rotor and corresponding assembling method Not-in-force EP2242909B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09709892A EP2242909B1 (en) 2008-02-14 2009-01-23 Turbomachine rotor, rotor blade for such a turbomachine rotor and corresponding assembling method

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP08002768A EP2090750A1 (en) 2008-02-14 2008-02-14 Turbomachine rotor, rotor blade for such a turbomachine rotor, supporting strip for such a rotor blade in the turbomachine rotor and corresponding assembling method
EP09709892A EP2242909B1 (en) 2008-02-14 2009-01-23 Turbomachine rotor, rotor blade for such a turbomachine rotor and corresponding assembling method
PCT/EP2009/050781 WO2009100975A1 (en) 2008-02-14 2009-01-23 Turbomachine rotor comprising a pretensioning device for pretensioning a guide vane

Publications (2)

Publication Number Publication Date
EP2242909A1 EP2242909A1 (en) 2010-10-27
EP2242909B1 true EP2242909B1 (en) 2013-03-13

Family

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Application Number Title Priority Date Filing Date
EP08002768A Withdrawn EP2090750A1 (en) 2008-02-14 2008-02-14 Turbomachine rotor, rotor blade for such a turbomachine rotor, supporting strip for such a rotor blade in the turbomachine rotor and corresponding assembling method
EP09709892A Not-in-force EP2242909B1 (en) 2008-02-14 2009-01-23 Turbomachine rotor, rotor blade for such a turbomachine rotor and corresponding assembling method

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP08002768A Withdrawn EP2090750A1 (en) 2008-02-14 2008-02-14 Turbomachine rotor, rotor blade for such a turbomachine rotor, supporting strip for such a rotor blade in the turbomachine rotor and corresponding assembling method

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US (1) US8512001B2 (en)
EP (2) EP2090750A1 (en)
JP (1) JP5069358B2 (en)
CN (1) CN101946062B (en)
WO (1) WO2009100975A1 (en)

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EP2299060A1 (en) * 2009-09-17 2011-03-23 Siemens Aktiengesellschaft Blade fixation with locking device for turbine blades
FR2975428B1 (en) * 2011-05-17 2015-11-20 Snecma TURBOMACHINE AUBES WHEEL
EP2562356A1 (en) * 2011-08-24 2013-02-27 Siemens Aktiengesellschaft Blade assembly
US10215035B2 (en) 2014-12-29 2019-02-26 Rolls-Royce North American Technologies Inc. Turbine wheels with preloaded blade attachment
GB201504186D0 (en) 2015-03-12 2015-04-29 Rolls Royce Plc Chocking and retaining device
US10815795B2 (en) * 2018-12-20 2020-10-27 General Electric Company Pre-tension and retention structure for composite fan blade
CN112049686A (en) * 2019-06-05 2020-12-08 中国航发商用航空发动机有限责任公司 Gas turbine rotor and gas turbine

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Also Published As

Publication number Publication date
WO2009100975A1 (en) 2009-08-20
US8512001B2 (en) 2013-08-20
JP5069358B2 (en) 2012-11-07
US20110171031A1 (en) 2011-07-14
EP2090750A1 (en) 2009-08-19
EP2242909A1 (en) 2010-10-27
CN101946062A (en) 2011-01-12
JP2011511896A (en) 2011-04-14
CN101946062B (en) 2014-02-05

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