EP2823153A1 - Impeller for a rotor of a turbomachine, and rotor and turbomachine having an impeller of said type - Google Patents

Impeller for a rotor of a turbomachine, and rotor and turbomachine having an impeller of said type

Info

Publication number
EP2823153A1
EP2823153A1 EP13706262.6A EP13706262A EP2823153A1 EP 2823153 A1 EP2823153 A1 EP 2823153A1 EP 13706262 A EP13706262 A EP 13706262A EP 2823153 A1 EP2823153 A1 EP 2823153A1
Authority
EP
European Patent Office
Prior art keywords
blade
impeller
groove
wheel disc
rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13706262.6A
Other languages
German (de)
French (fr)
Other versions
EP2823153B1 (en
Inventor
Bjoern Reinhold
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.)
MAN Energy Solutions SE
Original Assignee
MAN Diesel and Turbo SE
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 MAN Diesel and Turbo SE filed Critical MAN Diesel and Turbo SE
Publication of EP2823153A1 publication Critical patent/EP2823153A1/en
Application granted granted Critical
Publication of EP2823153B1 publication Critical patent/EP2823153B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/025—Fixing blade carrying members on shafts
    • 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

Definitions

  • Impeller for a rotor of a turbomachine as well
  • the invention relates to a trained according to the preamble of claim 1 impeller for a rotor of a turbomachine, equipped with such an impeller rotor for a turbomachine and a turbomachine with a rotor equipped with such an impeller.
  • the blades are each fixed by means of a rivet both axially and radially in their respective axial groove.
  • a rivet requires widening of a closing head of the rivet when mounting the respective blade, and dismantling (e.g., drilling away) the closing head when disassembling the respective blade.
  • the invention has for its object to provide an impeller according to the preamble of claim 1, so that the blades are assembled and disassembled with less time and can be fixed with defined radial tension in their respective axial grooves.
  • the invention is also based on the object to provide a rotor equipped with such an impeller for a turbomachine and a turbomachine with a rotor equipped with such an impeller.
  • an impeller for a rotor of a turbomachine comprising: a wheel disc to be provided on a rotor shaft of the rotor and having a plurality of grooves distributed along an outer circumference of the wheel disc and which each extend in an axially extending the rotor shaft thickness direction of the wheel disc; wherein at two mutually parallel to the thickness direction extending opposite groove sides of each groove a tooth profile is formed; a plurality of blades, each of which has a
  • Blade root with two mutually remote parallel to the thickness direction extending blade root sides, on each of which a tooth profile is formed; wherein each blade is inserted into a respective one of the grooves to form a blade-groove combination with its blade root so that the tooth profiles of the blade root sides engage with the tooth profiles of the groove sides; and wherein each blade-groove combination a
  • Fixing device which is arranged, the blade in the groove in both the thickness direction and in a radial direction of the wheel against
  • the impeller according to the invention is characterized in that each fixing device on both sides at least in the thickness direction
  • the bolt provides in the locking position for the side walls of the recess a double-sided stop in the thickness direction, so that the blade is fixed in the thickness direction against movement.
  • Blade under application to a predetermined biasing force in the radial direction (radially outward) fixed in this direction against movement.
  • the controlled adjustment of the bolt, the predetermined force or the predetermined biasing force (radial strain) can be predefined radially outward in a simple and repeatable manner.
  • Formed recess in the form of a circumferentially surrounded by material of the blade sink in the bottom of the blade, wherein a provided for engagement in the recess radially outermost end of the bolt is formed complementary to the recess.
  • the recess is formed as a negative to the outer contour of a spherical cap, wherein the radially outermost end of the bolt has a shape corresponding to the outer contour of this spherical cap.
  • this embodiment of the impeller according to the invention is advantageously a self-centering of the bolt in the recess and thus a more accurate fixation of the blade and easier insertion of the bolt realized in the recess.
  • each fixing device in the wheel disc on a first radial passage in the first passage which opens at a first longitudinal end of this in the groove and in which the bolt is preferably fitted with clearance fit.
  • the first passage provides in a simple and robust way a sliding guide for moving the bolt.
  • the first passage is designed as an easy-to-make hole.
  • each fixing device on an adjusting device which is arranged at a second longitudinal end of the first passage for the controlled adjustment of the bolt, wherein the adjusting device is arranged so that it faces from a pointing in the thickness direction lateral side of the wheel disc for adjusting the bolt is controlled.
  • the adjusting device can be activated from the lateral side of the wheel disc, this driving position is easily accessible to a person to be mounted or dismantled, as a result of which the respective expenditure of time is further reduced and the precision of the execution further improved.
  • the adjusting device has a second passage, which is formed in the thickness direction of the wheel disc running in this with internal thread, so that the first passage opens with its second longitudinal end in the second passage and a first
  • Longitudinal end of the second passage in the lateral side of the wheel disc opens, and a screw member which is screwed from the lateral side of the wheel disc in the second passage and which is in contact with a radially innermost end of the bolt, so that a displacement of the screw member causes a displacement of the bolt in the radial direction in the thickness direction of the wheel disc.
  • Screw element is particularly simple and robust, so that the
  • Manufacturing costs for the adjusting device are relatively low and their life and reliability are high.
  • a provided for contact with the bolt longitudinal end of the screw member is formed with a first conical shape, wherein the radially innermost end of the bolt is formed with a second conical shape, so that between each lateral surfaces of the first and the second cone shape line contact is realized.
  • the first conical shape has a cone angle of about 20 degrees. This size of the cone angle provides a particularly advantageous compromise between self-locking, actuating force and travel of the adjusting device.
  • a rotor for a turbomachine having at least one impeller in any conceivable combination according to one, several or all of the previously described embodiments of the invention.
  • a turbomachine with a rotor having at least one impeller in any conceivable combination according to one, several or all of the previously described embodiments of the invention.
  • FIG. 1 shows a partial sectional view of an impeller of a rotor
  • Turbomachine according to an embodiment of the invention, viewed in an axial direction of the rotor.
  • FIG. 2 shows a view of the impeller of FIG. 1, seen as a section along a section line AA in FIG. 1 and 2 show partial sectional views of an impeller 20 of a rotor 10 of a turbomachine 1 according to an embodiment of the invention.
  • the rotor 10 has a rotor shaft (not labeled) on which a plurality of impellers 20 as shown in FIGS. 1 and 2 are arranged one behind the other in an axial direction AR of the rotor shaft.
  • the turbomachine 1 having the rotor 10 is preferably a turbine, such as a turbine. as a steam turbine, or designed as a turbo compressor. In addition, the turbomachine 1 is preferred as
  • each impeller 20 includes a wheel disc 30, a plurality of blades 40 (only one shown), and a plurality of
  • Fixing devices 50 (only one shown) on.
  • the wheel disc 30 is arranged either integral therewith or as a separate part rotationally fixed to the rotor shaft of the rotor 10 and has a plurality of grooves 32 (only one shown), which are arranged distributed uniformly along an outer periphery 31 of the wheel disc 30 and which in each case in an axial direction of the rotor shaft extending thickness direction (which corresponds to the axial direction AR) of the wheel disc 30 extend.
  • each groove 32 has a tooth profile 33rd
  • Each blade 40 has a blade root 41 with two from each other
  • each blade 40 is inserted with a blade-groove combination with its blade root 41 in a respective one of the grooves 32, so that the tooth profiles 43 of the Schaufelfußrich with the tooth profiles 33 of the groove sides are engaged. In this way, the rotor blades 40 are resiliently held on the wheel disc 30 in a radial direction RR of the wheel disc 30 or of the rotor shaft.
  • the tooth profiles 33, 43 of the groove sides and the blade root sides are preferably designed as multi-toothed tooth profiles. More preferably, the blade roots 41 of the respective blades 40 are each formed in technical language as a fir tree root known blade foot 41. Accordingly, the grooves 32 of the wheel disc 30 are formed in their shape more preferably as a hull contour or negative to the shape of a Christmas tree foot.
  • Each combination of groove 32 and blade 40 fitted therein has one of the fixators 50.
  • Each fixing device 50 is adapted to fix the associated blade 40 in the associated groove 32 in the thickness direction or in the axial direction AR as well as in the radial direction RR of the wheel disc 30 against movement.
  • each fixing device 50 has an at least in the thickness direction or axial direction AR closed on both sides recess 51 in a bottom 32a of the groove 32 facing bottom 44 of the blade 40 and a preferably designed in the form of a circular cylindrical pin latch 52 which in the bottom 32a the groove 32 is received movable or displaceable.
  • Each fixing device 50 also has in the wheel disc 30 in an
  • Each fixing device 50 furthermore has an adjusting device 60, which is arranged on a second longitudinal end 53b of the first passage 53 for the controlled adjustment of the bolt 52.
  • the adjusting device 60 is set up so that it can be actuated by a lateral side 30a of the wheel disc 30 pointing in the direction of thickness or in the axial direction AR for adjusting the bolt 52.
  • the adjusting device 60 has a second passage 61, which is formed in the thickness direction or axial direction AR of the wheel disc 30 extending in this with internal thread (not designated), so that the first passage 53 with its second longitudinal end 53b in the second Passage 61 opens and a first longitudinal end 61 a of the second passage 61 in the lateral side 30 a of the wheel disc 30 opens.
  • the adjusting device 60 also has a screw element 62 designed in the form of a hexagon socket screw (not designated), which is screwed from the lateral side 30a of the wheel disc 30 into the second passage 61 and which has a radially innermost end of the wheel Bolt 52b is in sliding contact, so that a displacement of the screw member 62 in the thickness direction or axial direction AR of the wheel disc 30 causes a displacement of the bolt 52 in the radial direction RR.
  • a screw element 62 designed in the form of a hexagon socket screw (not designated), which is screwed from the lateral side 30a of the wheel disc 30 into the second passage 61 and which has a radially innermost end of the wheel Bolt 52b is in sliding contact, so that a displacement of the screw member 62 in the thickness direction or axial direction AR of the wheel disc 30 causes a displacement of the bolt 52 in the radial direction RR.
  • a longitudinal end 62a of the screw member 62 provided for contact with the latch 52 is formed in a first tapered shape, and the radially innermost end 52b of the latch 52 is formed with a second tapered shape such that between respective circumferential surfaces of the first and second
  • the first conical shape has a cone angle ⁇ of about 20 degrees.
  • the second cone shape preferably has a cone angle (not designated) of about 70 degrees.
  • the latch 52 is controllably controlled in the radial direction RR between an unlocking position (not shown in FIGS. 1 and 2) in which the latch 52 does not engage the recess 51 of the blade 40 and a latching position (as in FIGS 1 and 2), in which the latch 52 radially engages the recess 51 of the blade 40 so that it pushes the blade 40 radially outward with a predetermined force.
  • Axial direction AR is closed on both sides with side walls, the bolt 52 provides in the locking position for the side walls of the recess 51 a two-sided stop in the thickness direction or axial direction AR, so that the blade 40 is fixed in the thickness direction or axial direction AR against movement.
  • the blade 40 presses with a predetermined force radially outward, a game provided in the tooth profiles 33, 43 of the groove sides and the Schaufelfußdus for mounting and dismounting of the blade 40 in the groove 32 game and thus the blade under the action of a predetermined biasing force in
  • Radial direction RR (radially outward) fixed in this direction against movement.
  • the predetermined force or the predetermined prestressing force can be displaced radially outwards in a simple and repeatable manner, e.g. predefined by means of a torque wrench for actuating the screw member 62.
  • the recess 51 is preferably formed in the form of an all-round material of the blade 40 and sidewalls delimited sink in the bottom 44 of the blade 40, wherein a provided for engagement in the recess 51 radially extreme end 52a of the bolt 52 is formed in its shape complementary to the shape of the recess 51.
  • the recess 51 is formed as a Hüllkontur or negative to the outer contour of a spherical cap (or ball segment or ball portion), wherein the radially outermost end 52a of the bolt 52 one of the outer contour of this
  • Recess 51 is formed as a spherical seat for the approximately hemispherical radially outermost end 52 a of the bolt 52.
  • the impeller 20 is configured such that its moving blades 40 can be mounted and dismounted with less expenditure of time and can be fixed in their respective axially extending grooves 32 with a defined radial tension.

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

Abstract

An impeller (20) for a rotor (10) of a turbomachine (1), and rotor and turbomachine having an impeller of said type, the impeller comprising: a wheel disc (30) for mounting on the rotor, which wheel disc has multiple grooves (32) which are arranged along a circumference (31) of the wheel disc and which extend in the thickness direction of the wheel disc, wherein in each case one toothed profile (33) is formed on two sides of each groove; a plurality of impeller blades (40) which have in each case one root (41) with two sides on which in each case one toothed profile (43) is formed, wherein each blade is inserted into a groove so as to form a blade-groove combination such that the toothed profiles of the root and of the groove are in engagement, and wherein each combination has a fixing device (50) which fixes the blade in the groove in the thickness direction and in the radial direction (RR) of the wheel disc. To be able to quickly mount/dismount the blades and fix said blades in the grooves with a defined radial clamping action, each fixing device has a recess (51), which is closed on two sides, in an underside (44), which faces toward a groove base (32a), of the blade and has a bar (52) which is movably received in the groove base so as to be radially adjustable between an unlocked position, in which it does not engage into the recess, and a locked position, in which it engages into the recess so as to push the blade radially outward.

Description

Laufrad für einen Rotor einer Turbomaschine sowie  Impeller for a rotor of a turbomachine as well
Rotor und Turbomaschine mit einem solchen Laufrad  Rotor and turbomachinery with such an impeller
Die Erfindung betrifft ein gemäß dem Oberbegriff des Anspruchs 1 ausgebildetes Laufrad für einen Rotor einer Turbomaschine, einen mit einem solchen Laufrad ausgerüsteten Rotor für eine Turbomaschine sowie eine Turbomaschine mit einem mit einem solchen Laufrad ausgerüsteten Rotor. The invention relates to a trained according to the preamble of claim 1 impeller for a rotor of a turbomachine, equipped with such an impeller rotor for a turbomachine and a turbomachine with a rotor equipped with such an impeller.
Ein Laufrad, ein Rotor und eine Turbomaschine der eingangsgenannten Art sind jeweils aus DE 196 03 388 C1 bekannt. Bei dem in diesem Dokument An impeller, a rotor and a turbomachine of the type mentioned above are each known from DE 196 03 388 C1. When in this document
beschriebenen Laufrad sind die Laufschaufeln jeweils mittels eines Niets sowohl axial als auch radial in ihrer jeweiligen Axialnut fixiert. Ein solcher Niet erfordert beim Montieren der jeweiligen Laufschaufel ein Aufweiten eines Schließkopfes des Niets sowie beim Demontieren der jeweiligen Laufschaufel ein Abarbeiten (z.B. ein Wegbohren) des Schließkopfes. Diese Vorgehensweisen sind described impeller, the blades are each fixed by means of a rivet both axially and radially in their respective axial groove. Such a rivet requires widening of a closing head of the rivet when mounting the respective blade, and dismantling (e.g., drilling away) the closing head when disassembling the respective blade. These procedures are
zeitaufwendig und realisieren beim Montieren nur bedingt eine definierte radiale Verspannung der Laufschaufeln in ihren jeweiligen Axialnuten. time consuming and realize only a limited defined radial clamping of the blades in their respective axial grooves during mounting.
Der Erfindung liegt die Aufgabe zugrunde, ein Laufrad gemäß dem Oberbegriff des Anspruchs 1 bereitzustellen, so dass dessen Laufschaufeln mit geringerem Zeitaufwand montierbar und demontierbar sind und mit definierter radialer Verspannung in ihren jeweiligen Axialnuten fixierbar sind. Der Erfindung liegt außerdem die Aufgabe zugrunde, einen mit einem solchen Laufrad ausgerüsteten Rotor für eine Turbomaschine sowie eine Turbomaschine mit einem mit einem solchen Laufrad ausgerüsteten Rotor bereitzustellen. The invention has for its object to provide an impeller according to the preamble of claim 1, so that the blades are assembled and disassembled with less time and can be fixed with defined radial tension in their respective axial grooves. The invention is also based on the object to provide a rotor equipped with such an impeller for a turbomachine and a turbomachine with a rotor equipped with such an impeller.
Die o.g. Aufgaben werden mit einem Laufrad gemäß Anspruch 1 , einem Rotor gemäß Anspruch 9 bzw. einer Turbomaschine gemäß Anspruch 10 gelöst. Weiterbildungen des erfindungsgemäßen Laufrades sind in den abhängigen Ansprüchen definiert. The above objects are achieved with an impeller according to claim 1, a rotor according to claim 9 and a turbomachine according to claim 10. Further developments of the impeller according to the invention are defined in the dependent claims.
Gemäß einem ersten Aspekt der Erfindung wird bereitgestellt ein Laufrad für einen Rotor einer Turbomaschine, wobei das Laufrad aufweist: eine Radscheibe, die an einer Rotorwelle des Rotors vorzusehen ist und die eine Mehrzahl von Nuten hat, welche entlang eines Außenumfangs der Radscheibe verteilt angeordnet sind und welche sich jeweils in einer axial der Rotorwelle verlaufenden Dickenrichtung der Radscheibe erstrecken; wobei an zwei parallel zur Dickenrichtung verlaufenden einander gegenüberliegenden Nutseiten jeder Nut jeweils ein Zahnprofil ausgebildet ist; eine Mehrzahl von Laufschaufeln, von denen jede einen According to a first aspect of the invention there is provided an impeller for a rotor of a turbomachine, the impeller comprising: a wheel disc to be provided on a rotor shaft of the rotor and having a plurality of grooves distributed along an outer circumference of the wheel disc and which each extend in an axially extending the rotor shaft thickness direction of the wheel disc; wherein at two mutually parallel to the thickness direction extending opposite groove sides of each groove a tooth profile is formed; a plurality of blades, each of which has a
Schaufelfuß mit zwei voneinander abgewandten parallel zur Dickenrichtung verlaufenden Schaufelfußseiten aufweist, an denen jeweils ein Zahnprofil ausgebildet ist; wobei jede Laufschaufel unter Ausbildung einer Laufschaufel-Nut- Kombination mit ihrem Schaufelfuß in eine jeweilige der Nuten eingesetzt ist, so dass die Zahnprofile der Schaufelfußseiten mit den Zahnprofilen der Nutseiten in Eingriff stehen; und wobei jede Laufschaufel-Nut-Kombination eine Blade root with two mutually remote parallel to the thickness direction extending blade root sides, on each of which a tooth profile is formed; wherein each blade is inserted into a respective one of the grooves to form a blade-groove combination with its blade root so that the tooth profiles of the blade root sides engage with the tooth profiles of the groove sides; and wherein each blade-groove combination a
Fixiereinrichtung aufweist, die eingerichtet ist, die Laufschaufel in der Nut sowohl in Dickenrichtung als auch in einer Radialrichtung der Radscheibe gegen Fixing device, which is arranged, the blade in the groove in both the thickness direction and in a radial direction of the wheel against
Bewegung zu fixieren. Das erfindungsgemäße Laufrad zeichnet sich dadurch aus, dass jede Fixiereinrichtung eine zumindest in Dickenrichtung beidseitig To fix movement. The impeller according to the invention is characterized in that each fixing device on both sides at least in the thickness direction
geschlossene Ausnehmung in einer einem Boden der Nut zugewandten closed recess facing in a bottom of the groove
Unterseite der Laufschaufel und einen Riegel aufweist, der im Boden der Nut bewegbar aufgenommen ist, so dass der Riegel in Radialrichtung gesteuert verstellbar ist zwischen einer Entriegelungsposition, in der der Riegel nicht in die Ausnehmung der Laufschaufel eingreift, und einer Verriegelungsposition, in der der Riegel radial in die Ausnehmung der Laufschaufel eingreift, so dass er die Laufschaufel mit einer vorbestimmten Kraft nach radial außen drückt. Bottom of the blade and a latch which is movably received in the bottom of the groove, so that the bolt is controlled controlled in the radial direction between an unlocking position in which the bolt does not engage in the recess of the blade, and a locking position in which the bolt engages radially in the recess of the blade, so that it presses the blade radially outward with a predetermined force.
Dadurch, dass die Ausnehmung zumindest in Dickenrichtung beidseitig mitCharacterized in that the recess at least in the thickness direction with both sides
Seitenwänden geschlossen ist, bietet der Riegel in der Verriegelungsposition für die Seitenwände der Ausnehmung einen beidseitigen Anschlag in Dickenrichtung, so dass die Laufschaufel in Dickenrichtung gegen Bewegung fixiert ist. Sidewalls is closed, the bolt provides in the locking position for the side walls of the recess a double-sided stop in the thickness direction, so that the blade is fixed in the thickness direction against movement.
Dadurch, dass der Riegel in der Verriegelungsposition die Laufschaufel mit einer vorbestimmten Kraft nach radial außen drückt, wird ein in den Zahnprofilen der Nutseiten und der Schaufelfußseiten zur Montage und Demontage der Characterized in that the bolt in the locking position, the blade with a predetermined force pushes radially outward, is in the tooth profiles of the groove sides and the Schaufelfußseiten for mounting and dismounting of
Laufschaufel in der Nut vorgesehenes Spiel aufgebraucht und damit die Blade in the groove provided game used up and thus the
Laufschaufel unter Beaufschlagung mit einer vorbestimmten Vorspannkraft in Radialrichtung (nach radial außen) in dieser Richtung gegen Bewegung fixiert. Durch das gesteuerte Verstellen des Riegels lässt sich die vorbestimmte Kraft bzw. die vorbestimmte Vorspannkraft (radiale Verspannung) nach radial außen in einfacher und wiederholbarer Weise vordefinieren. Blade under application to a predetermined biasing force in the radial direction (radially outward) fixed in this direction against movement. The controlled adjustment of the bolt, the predetermined force or the predetermined biasing force (radial strain) can be predefined radially outward in a simple and repeatable manner.
Dadurch, dass der Riegel in seine Entriegelungsposition, in der er außer Eingriff mit der Ausnehmung der Laufschaufel ist, versenkbar ist, kann das Spiel in den Zahnprofilen der Nutseiten und der Schaufelfußseiten wieder freigegeben werden, so dass die Laufschaufel sowohl bei ihrer Montage an als auch bei ihrer Characterized in that the latch is retractable into its unlocking position in which it is disengaged from the recess of the blade, the game in the tooth profiles of the groove sides and the Schaufelfußseiten can be released again, so that the blade both during their assembly and At her
Demontage von der Radscheibe einfach und schnell axial in die Nut hinein bzw. aus der Nut heraus schiebbar ist. Disassembly of the wheel easily and quickly axially into the groove or out of the groove is pushed out.
Gemäß einer Ausführungsform des erfindungsgemäßen Laufrades ist die According to one embodiment of the impeller according to the invention is the
Ausnehmung in Form einer allseitig von Material der Laufschaufel umgrenzten Senke in der Unterseite der Laufschaufel gebildet, wobei ein zum Eingriff in der Ausnehmung vorgesehenes radial äußerstes Ende des Riegels komplementär zu der Ausnehmung ausgebildet ist. Formed recess in the form of a circumferentially surrounded by material of the blade sink in the bottom of the blade, wherein a provided for engagement in the recess radially outermost end of the bolt is formed complementary to the recess.
Mit dieser erfindungsgemäßen Ausgestaltung des Laufrades wird vorteilhaft zusätzlich eine Fixierung der Laufschaufel in der Nut gegen eine mögliche With this embodiment of the impeller according to the invention is advantageously in addition a fixation of the blade in the groove against a possible
Bewegung in einer Umfangsrichtung der Radscheibe realisiert. Gemäß einer weiteren Ausführungsform des erfindungsgemäßen Laufrades ist die Ausnehmung als Negativ zur Außenkontur einer Kugelkalotte ausgebildet, wobei das radial äußerste Ende des Riegels eine der Außenkontur dieser Kugelkalotte entsprechende Form aufweist. Realized movement in a circumferential direction of the wheel disc. According to a further embodiment of the impeller according to the invention, the recess is formed as a negative to the outer contour of a spherical cap, wherein the radially outermost end of the bolt has a shape corresponding to the outer contour of this spherical cap.
Mit dieser erfindungsgemäßen Ausgestaltung des Laufrades wird vorteilhaft eine Selbstzentrierung des Riegels in der Ausnehmung und werden damit eine genauere Fixierung der Laufschaufel und ein leichteres Einführen des Riegels in die Ausnehmung realisiert. With this embodiment of the impeller according to the invention is advantageously a self-centering of the bolt in the recess and thus a more accurate fixation of the blade and easier insertion of the bolt realized in the recess.
Gemäß noch einer Ausführungsform des erfindungsgemäßen Laufrades weist jede Fixiereinrichtung in der Radscheibe eine in Radialrichtung verlaufende erste Passage auf, die an einem ersten Längsende dieser in die Nut mündet und in die der Riegel bevorzugt mit Spielpassung eingepasst ist. According to yet another embodiment of the impeller according to the invention, each fixing device in the wheel disc on a first radial passage in the first passage, which opens at a first longitudinal end of this in the groove and in which the bolt is preferably fitted with clearance fit.
Die erste Passage stellt in einfacher und robuster Weise eine Gleitführung zum Verschieben des Riegels bereit. Bevorzugt ist die erste Passage als einfach zu fertigende Bohrung ausgeführt. The first passage provides in a simple and robust way a sliding guide for moving the bolt. Preferably, the first passage is designed as an easy-to-make hole.
Gemäß noch einer weiteren Ausführungsform des erfindungsgemäßen Laufrades weist jede Fixiereinrichtung eine Stellvorrichtung auf, die an einem zweiten Längsende der ersten Passage zum gesteuerten Verstellen des Riegels angeordnet ist, wobei die Stellvorrichtung eingerichtet ist, so dass sie von einer in Dickenrichtung weisenden seitlichen Seite der Radscheibe aus zum Verstellen des Riegels ansteuerbar ist. According to yet another embodiment of the impeller according to the invention, each fixing device on an adjusting device which is arranged at a second longitudinal end of the first passage for the controlled adjustment of the bolt, wherein the adjusting device is arranged so that it faces from a pointing in the thickness direction lateral side of the wheel disc for adjusting the bolt is controlled.
Dadurch, dass die Stellvorrichtung von der seitlichen Seite der Radscheibe aus ansteuerbar ist, ist diese Ansteuerungsposition für eine montierende oder demontierende Person leicht zugänglich, wodurch der jeweilige Zeitaufwand weiter reduziert und die Ausführungsgenauigkeit weiter verbessert werden. Gemäß einer Ausführungsform des erfindungsgemäßen Laufrades weist die Stellvorrichtung eine zweite Passage, die in Dickenrichtung der Radscheibe verlaufend in dieser mit Innengewinde ausgebildet ist, so dass die erste Passage mit ihrem zweiten Längsende in die zweite Passage mündet und ein erstesBecause the adjusting device can be activated from the lateral side of the wheel disc, this driving position is easily accessible to a person to be mounted or dismantled, as a result of which the respective expenditure of time is further reduced and the precision of the execution further improved. According to one embodiment of the impeller according to the invention, the adjusting device has a second passage, which is formed in the thickness direction of the wheel disc running in this with internal thread, so that the first passage opens with its second longitudinal end in the second passage and a first
Längsende der zweiten Passage in der seitlichen Seite der Radscheibe mündet, und ein Schraubenelement auf, das von der seitlichen Seite der Radscheibe aus in die zweite Passage eingeschraubt ist und das mit einem radial innersten Ende des Riegels in Kontakt steht, so dass eine Verlagerung des Schraubenelements in Dickenrichtung der Radscheibe eine Verlagerung des Riegels in Radialrichtung bewirkt. Longitudinal end of the second passage in the lateral side of the wheel disc opens, and a screw member which is screwed from the lateral side of the wheel disc in the second passage and which is in contact with a radially innermost end of the bolt, so that a displacement of the screw member causes a displacement of the bolt in the radial direction in the thickness direction of the wheel disc.
Die Realisierung der Stellvorrichtung mit dem in die bevorzugt als einfach herzustellende Bohrung ausgebildete zweite Passage eingeschraubten The realization of the adjusting device with the screwed into the preferably designed as easy to manufacture bore second passage screwed
Schraubenelement ist besonders einfach und robust, so dass die Screw element is particularly simple and robust, so that the
Herstellungskosten für die Stellvorrichtung relativ gering sind und deren Standzeit und Zuverlässigkeit hoch sind.  Manufacturing costs for the adjusting device are relatively low and their life and reliability are high.
Gemäß einer weiteren Ausführungsform des erfindungsgemäßen Laufrades ist ein zum Kontakt mit dem Riegel vorgesehenes Längsende des Schraubenelements mit einer ersten Kegelform ausgebildet, wobei das radial innerste Ende des Riegels mit einer zweiten Kegelform ausgebildet ist, so dass zwischen jeweiligen Mantelflächen der ersten und der zweiten Kegelform Linienberührung realisiert ist. According to a further embodiment of the impeller according to the invention, a provided for contact with the bolt longitudinal end of the screw member is formed with a first conical shape, wherein the radially innermost end of the bolt is formed with a second conical shape, so that between each lateral surfaces of the first and the second cone shape line contact is realized.
Diese erfindungsgemäße Ausgestaltung des Laufrades stellt eine Keilschieber- Anordnung bereit, welche in besonders einfacher und robuster Weise eine This embodiment of the impeller according to the invention provides a Keilschieber- arrangement which in a particularly simple and robust way a
Richtungsänderung der Stellbewegung realisiert. Direction change of the actuating movement realized.
Gemäß noch einer Ausführungsform des erfindungsgemäßen Laufrades weist die erste Kegelform einen Kegelwinkel von etwa 20 Grad auf. Diese Größe des Kegelwinkels stellt einen besonders vorteilhaften Kompromiss zwischen Selbsthemmung, Stellkraft und Stellweg der Stellvorrichtung bereit. According to yet another embodiment of the impeller according to the invention, the first conical shape has a cone angle of about 20 degrees. This size of the cone angle provides a particularly advantageous compromise between self-locking, actuating force and travel of the adjusting device.
Gemäß einem zweiten Aspekt der Erfindung wird bereitgestellt ein Rotor für eine Turbomaschine, wobei der Rotor wenigstens ein Laufrad gemäß einer, mehreren oder allen zuvor beschriebenen Ausführungsformen der Erfindung in jeder denkbaren Kombination aufweist. According to a second aspect of the invention, there is provided a rotor for a turbomachine, the rotor having at least one impeller in any conceivable combination according to one, several or all of the previously described embodiments of the invention.
Gemäß einem dritten Aspekt der Erfindung wird bereitgestellt eine Turbomaschine mit einem Rotor, der wenigstens ein Laufrad gemäß einer, mehreren oder allen zuvor beschriebenen Ausführungsformen der Erfindung in jeder denkbaren Kombination aufweist. According to a third aspect of the invention there is provided a turbomachine with a rotor having at least one impeller in any conceivable combination according to one, several or all of the previously described embodiments of the invention.
Die Erfindung erstreckt sich ausdrücklich auch auf solche Ausführungsformen, welche nicht durch Merkmalskombinationen aus expliziten Rückbezügen der Ansprüche gegeben sind, womit die offenbarten Merkmale der Erfindung - soweit dies technisch sinnvoll ist - beliebig miteinander kombiniert sein können. The invention expressly extends to such embodiments, which are not given by combinations of features of explicit back references of the claims, with which the disclosed features of the invention - as far as is technically feasible - can be combined with each other.
Im Folgenden wird die Erfindung anhand einer bevorzugten Ausführungsform und unter Bezugnahme auf die beigefügten Figuren detaillierter beschrieben. In the following the invention will be described in more detail by means of a preferred embodiment and with reference to the attached figures.
Fig.1 zeigt eine geschnittene Teilansicht eines Laufrades eines Rotors einer1 shows a partial sectional view of an impeller of a rotor one
Turbomaschine gemäß einer Ausführungsform der Erfindung, gesehen in einer Axialrichtung des Rotors. Turbomachine according to an embodiment of the invention, viewed in an axial direction of the rotor.
Fig.2 zeigt eine Ansicht des Laufrades von Fig.1 , gesehen als Schnitt entlang einer Schnittlinie A-A in Fig.1 . Fig.1 und Fig.2 zeigen geschnittene Teilansichten eines Laufrades 20 eines Rotors 10 einer Turbomaschine 1 gemäß einer Ausführungsform der Erfindung. FIG. 2 shows a view of the impeller of FIG. 1, seen as a section along a section line AA in FIG. 1 and 2 show partial sectional views of an impeller 20 of a rotor 10 of a turbomachine 1 according to an embodiment of the invention.
Der Rotor 10 weist eine Rotorwelle (nicht bezeichnet) auf, an der mehrere wie in Fig.1 und Fig.2 gezeigte Laufräder 20 in einer Axialrichtung AR der Rotorwelle hintereinander angeordnet sind. Die den Rotor 10 aufweisende Turbomaschine 1 ist bevorzugt als Turbine, wie z.B. als Dampfturbine, oder als Turbokompressor ausgebildet. Außerdem ist die Turbomaschine 1 bevorzugt als The rotor 10 has a rotor shaft (not labeled) on which a plurality of impellers 20 as shown in FIGS. 1 and 2 are arranged one behind the other in an axial direction AR of the rotor shaft. The turbomachine 1 having the rotor 10 is preferably a turbine, such as a turbine. as a steam turbine, or designed as a turbo compressor. In addition, the turbomachine 1 is preferred as
Axialströmungsmaschine ausgebildet. Axial flow machine formed.
Wie in Fig.1 und Fig.2 gezeigt, weist jedes Laufrad 20 eine Radscheibe 30, eine Mehrzahl von Laufschaufeln 40 (nur eine gezeigt) und eine Mehrzahl von As shown in FIGS. 1 and 2, each impeller 20 includes a wheel disc 30, a plurality of blades 40 (only one shown), and a plurality of
Fixiereinrichtungen 50 (nur eine gezeigt) auf. Fixing devices 50 (only one shown) on.
Die Radscheibe 30 ist entweder integral damit oder als separates Teil drehfest an der Rotorwelle des Rotors 10 angeordnet und weist eine Mehrzahl von Nuten 32 (nur eine gezeigt) auf, welche entlang eines Außenumfangs 31 der Radscheibe 30 gleichmäßig verteilt angeordnet sind und welche sich jeweils in einer axial der Rotorwelle verlaufenden Dickenrichtung (welche der Axialrichtung AR entspricht) der Radscheibe 30 erstrecken. The wheel disc 30 is arranged either integral therewith or as a separate part rotationally fixed to the rotor shaft of the rotor 10 and has a plurality of grooves 32 (only one shown), which are arranged distributed uniformly along an outer periphery 31 of the wheel disc 30 and which in each case in an axial direction of the rotor shaft extending thickness direction (which corresponds to the axial direction AR) of the wheel disc 30 extend.
An zwei parallel zur Dickenrichtung bzw. Axialrichtung AR verlaufenden einander gegenüberliegenden Nutseiten jeder Nut 32 jeweils ist ein Zahnprofil 33 At two mutually parallel groove sides or axial direction AR extending opposite groove sides of each groove 32 each has a tooth profile 33rd
ausgebildet. educated.
Jede Laufschaufel 40 hat einen Schaufelfuß 41 mit zwei voneinander Each blade 40 has a blade root 41 with two from each other
abgewandten parallel zur Dickenrichtung bzw. Axialrichtung AR verlaufenden Schaufelfußseiten, an denen jeweils ein Zahnprofil 43 ausgebildet ist. Jede Laufschaufel 40 ist unter Ausbildung einer Laufschaufel-Nut-Kombination mit ihrem Schaufelfuß 41 in eine jeweilige der Nuten 32 eingesetzt, so dass die Zahnprofile 43 der Schaufelfußseiten mit den Zahnprofilen 33 der Nutseiten in Eingriff stehen. Auf diese Weise sind die Laufschaufeln 40 in einer Radialrichtung RR der Radscheibe 30 bzw. der Rotorwelle ausfallsicher an der Radscheibe 30 gehalten. remote from the thickness direction or axial direction AR extending blade root sides, on each of which a tooth profile 43 is formed. Each blade 40 is inserted with a blade-groove combination with its blade root 41 in a respective one of the grooves 32, so that the tooth profiles 43 of the Schaufelfußseiten with the tooth profiles 33 of the groove sides are engaged. In this way, the rotor blades 40 are resiliently held on the wheel disc 30 in a radial direction RR of the wheel disc 30 or of the rotor shaft.
Wie aus Fig.1 ersichtlich, sind die Zahnprofile 33, 43 der Nutseiten und der Schaufelfußseiten bevorzugt als mehrzahnige Zahnprofile ausgebildet. Noch bevorzugter sind die Schaufelfüße 41 der jeweiligen Laufschaufeln 40 jeweils fachsprachlich auch als Tannenbaumfuß bekannter Schaufelfuß 41 ausgebildet. Dementsprechend sind die Nuten 32 der Radscheibe 30 in ihrer Form bevorzugter als Hüllkontur bzw. Negativ zur Form eines Tannenbaumfußes ausgebildet. As can be seen from FIG. 1, the tooth profiles 33, 43 of the groove sides and the blade root sides are preferably designed as multi-toothed tooth profiles. More preferably, the blade roots 41 of the respective blades 40 are each formed in technical language as a fir tree root known blade foot 41. Accordingly, the grooves 32 of the wheel disc 30 are formed in their shape more preferably as a hull contour or negative to the shape of a Christmas tree foot.
Jede Kombination von Nut 32 und darin eingepasster Laufschaufel 40 weist eine der Fixiereinrichtungen 50 auf. Jede Fixiereinrichtung 50 ist eingerichtet, die zugehörige Laufschaufel 40 in der zugehörigen Nut 32 sowohl in Dickenrichtung bzw. Axialrichtung AR als auch in Radialrichtung RR der Radscheibe 30 gegen Bewegung zu fixieren. Each combination of groove 32 and blade 40 fitted therein has one of the fixators 50. Each fixing device 50 is adapted to fix the associated blade 40 in the associated groove 32 in the thickness direction or in the axial direction AR as well as in the radial direction RR of the wheel disc 30 against movement.
Zu diesem Zweck weist jede Fixiereinrichtung 50 eine zumindest in Dickenrichtung bzw. Axialrichtung AR beidseitig geschlossene Ausnehmung 51 in einer einem Boden 32a der Nut 32 zugewandten Unterseite 44 der Laufschaufel 40 und einen bevorzugt in Form eines kreiszylindrischen Stiftes ausgebildeten Riegel 52 auf, der im Boden 32a der Nut 32 bewegbar bzw. verschiebbar aufgenommen ist. For this purpose, each fixing device 50 has an at least in the thickness direction or axial direction AR closed on both sides recess 51 in a bottom 32a of the groove 32 facing bottom 44 of the blade 40 and a preferably designed in the form of a circular cylindrical pin latch 52 which in the bottom 32a the groove 32 is received movable or displaceable.
Jede Fixiereinrichtung 50 weist außerdem in der Radscheibe 30 eine in Each fixing device 50 also has in the wheel disc 30 in an
Radialrichtung RR verlaufende erste Passage 53 auf, die an einem ersten Radial direction RR extending first passage 53, which at a first
Längsende 53a dieser am Boden 32a in die Nut 32 mündet und in die der Riegel 52 mit Spielpassung eingepasst ist. Jede Fixiereinrichtung 50 weist darüber hinaus eine Stellvorrichtung 60 auf, die an einem zweiten Längsende 53b der ersten Passage 53 zum gesteuerten Verstellen des Riegels 52 angeordnet ist. Die Stellvorrichtung 60 ist eingerichtet, so dass sie von einer in Dickenrichtung bzw. Axialrichtung AR weisenden seitlichen Seite 30a der Radscheibe 30 aus zum Verstellen des Riegels 52 ansteuerbar ist. Longitudinal end 53 a of these at the bottom 32 a opens into the groove 32 and in which the latch 52 is fitted with a clearance fit. Each fixing device 50 furthermore has an adjusting device 60, which is arranged on a second longitudinal end 53b of the first passage 53 for the controlled adjustment of the bolt 52. The adjusting device 60 is set up so that it can be actuated by a lateral side 30a of the wheel disc 30 pointing in the direction of thickness or in the axial direction AR for adjusting the bolt 52.
In der gezeigten Ausführungsform weist die Stellvorrichtung 60 eine zweite Passage 61 auf, die in Dickenrichtung bzw. Axialrichtung AR der Radscheibe 30 verlaufend in dieser mit Innengewinde (nicht bezeichnet) ausgebildet ist, so dass die erste Passage 53 mit ihrem zweiten Längsende 53b in die zweite Passage 61 mündet und ein erstes Längsende 61 a der zweiten Passage 61 in der seitlichen Seite 30a der Radscheibe 30 mündet. In the embodiment shown, the adjusting device 60 has a second passage 61, which is formed in the thickness direction or axial direction AR of the wheel disc 30 extending in this with internal thread (not designated), so that the first passage 53 with its second longitudinal end 53b in the second Passage 61 opens and a first longitudinal end 61 a of the second passage 61 in the lateral side 30 a of the wheel disc 30 opens.
In der gezeigten Ausführungsform weist die Stellvorrichtung 60 außerdem ein in Form einer Madenschraube mit Innensechskant (nicht bezeichnet) ausgebildetes Schraubenelement 62 auf, das von der seitlichen Seite 30a der Radscheibe 30 aus in die zweite Passage 61 eingeschraubt ist und das mit einem radial innersten Ende des Riegels 52b in gleitendem Berührungskontakt steht, so dass eine Verlagerung des Schraubenelements 62 in Dickenrichtung bzw. Axialrichtung AR der Radscheibe 30 eine Verlagerung des Riegels 52 in Radialrichtung RR bewirkt. In the embodiment shown, the adjusting device 60 also has a screw element 62 designed in the form of a hexagon socket screw (not designated), which is screwed from the lateral side 30a of the wheel disc 30 into the second passage 61 and which has a radially innermost end of the wheel Bolt 52b is in sliding contact, so that a displacement of the screw member 62 in the thickness direction or axial direction AR of the wheel disc 30 causes a displacement of the bolt 52 in the radial direction RR.
Genauer gesagt ist ein zum Kontakt mit dem Riegel 52 vorgesehenes Längsende 62a des Schraubenelements 62 mit einer ersten Kegelform ausgebildet, wobei das radial innerste Ende 52b des Riegels 52 mit einer zweiten Kegelform ausgebildet ist, so dass zwischen jeweiligen Mantelflächen der ersten und der zweiten More specifically, a longitudinal end 62a of the screw member 62 provided for contact with the latch 52 is formed in a first tapered shape, and the radially innermost end 52b of the latch 52 is formed with a second tapered shape such that between respective circumferential surfaces of the first and second
Kegelform Linienberührung realisiert ist. Bevorzugt weist die erste Kegelform einen Kegelwinkel α von etwa 20 Grad auf. Dementsprechend hat die zweite Kegelform bevorzugt einen Kegelwinkel (nicht bezeichnet) von etwa 70 Grad. Durch die oben beschriebene Konstruktion ist der Riegel 52 in Radialrichtung RR gesteuert verstellbar zwischen einer Entriegelungsposition (in den Figuren 1 und 2 nicht gezeigt), in der der Riegel 52 nicht in die Ausnehmung 51 der Laufschaufel 40 eingreift, und einer Verriegelungsposition (wie in den Figuren 1 und 2 gezeigt), in der der Riegel 52 radial in die Ausnehmung 51 der Laufschaufel 40 eingreift, so dass er die Laufschaufel 40 mit einer vorbestimmten Kraft nach radial außen drückt. Conical line contact is realized. Preferably, the first conical shape has a cone angle α of about 20 degrees. Accordingly, the second cone shape preferably has a cone angle (not designated) of about 70 degrees. By the construction described above, the latch 52 is controllably controlled in the radial direction RR between an unlocking position (not shown in FIGS. 1 and 2) in which the latch 52 does not engage the recess 51 of the blade 40 and a latching position (as in FIGS 1 and 2), in which the latch 52 radially engages the recess 51 of the blade 40 so that it pushes the blade 40 radially outward with a predetermined force.
Dadurch, dass die Ausnehmung 51 zumindest in Dickenrichtung bzw. Characterized in that the recess 51 at least in the thickness direction or
Axialrichtung AR beidseitig mit Seitenwänden geschlossen ist, bietet der Riegel 52 in der Verriegelungsposition für die Seitenwände der Ausnehmung 51 einen beidseitigen Anschlag in Dickenrichtung bzw. Axialrichtung AR, so dass die Laufschaufel 40 in Dickenrichtung bzw. Axialrichtung AR gegen Bewegung fixiert ist. Axial direction AR is closed on both sides with side walls, the bolt 52 provides in the locking position for the side walls of the recess 51 a two-sided stop in the thickness direction or axial direction AR, so that the blade 40 is fixed in the thickness direction or axial direction AR against movement.
Dadurch, dass der Riegel 52 in der Verriegelungsposition die Laufschaufel 40 mit einer vorbestimmten Kraft nach radial außen drückt, wird ein in den Zahnprofilen 33, 43 der Nutseiten und der Schaufelfußseiten zur Montage und Demontage der Laufschaufel 40 in der Nut 32 vorgesehenes Spiel aufgebraucht und damit die Laufschaufel unter Beaufschlagung mit einer vorbestimmten Vorspannkraft inCharacterized in that the latch 52 in the locking position, the blade 40 presses with a predetermined force radially outward, a game provided in the tooth profiles 33, 43 of the groove sides and the Schaufelfußseiten for mounting and dismounting of the blade 40 in the groove 32 game and thus the blade under the action of a predetermined biasing force in
Radialrichtung RR (nach radial außen) in dieser Richtung gegen Bewegung fixiert. Radial direction RR (radially outward) fixed in this direction against movement.
Durch die beschriebene Ausgestaltung der Stellvorrichtung 60 lässt sich die vorbestimmte Kraft bzw. die vorbestimmte Vorspannkraft (radiale Verspannung) nach radial außen in einfacher und wiederholbarer Weise z.B. mittels eines Momentenschlüssels zur Betätigung des Schraubenelements 62 vordefinieren. As a result of the described configuration of the adjusting device 60, the predetermined force or the predetermined prestressing force (radial tensioning) can be displaced radially outwards in a simple and repeatable manner, e.g. predefined by means of a torque wrench for actuating the screw member 62.
Dadurch, dass der Riegel 52 in seine Entriegelungsposition, in der er außer Eingriff mit der Ausnehmung 51 der Laufschaufel 40 ist, versenkbar ist, kann das Spiel in den Zahnprofilen 33, 43 der Nutseiten und der Schaufelfußseiten wieder freigegeben werden, so dass die Laufschaufel 40 sowohl bei ihrer Montage an als auch bei ihrer Demontage von der Radscheibe 30 einfach und schnell axial in die Nut 32 hinein bzw. aus der Nut 32 heraus schiebbar ist. Characterized in that the latch 52 in its unlocked position in which it is out of engagement with the recess 51 of the blade 40, retractable, the game in the tooth profiles 33, 43 of the groove sides and the blade root sides again be released so that the blade 40 both in their assembly to and during their disassembly of the wheel disc 30 is easy and fast axially into the groove 32 into or out of the groove 32 pushed out.
Wie aus der Zusammenschau der Figuren 1 und 2 ersichtlich, ist die Ausnehmung 51 bevorzugt in Form einer allseitig von Material der Laufschaufel 40 bzw. von Seitenwänden umgrenzten Senke in der Unterseite 44 der Laufschaufel 40 gebildet, wobei ein zum Eingriff in der Ausnehmung 51 vorgesehenes radial äußerstes Ende 52a des Riegels 52 in seiner Form komplementär zur Form der Ausnehmung 51 ausgebildet ist. In der gezeigten Ausführungsform der Erfindung ist die Ausnehmung 51 als Hüllkontur bzw. Negativ zur Außenkontur einer Kugelkalotte (bzw. Kugelsegment oder Kugelabschnitt) ausgebildet, wobei das radial äußerste Ende 52a des Riegels 52 eine der Außenkontur dieser As can be seen from the combination of Figures 1 and 2, the recess 51 is preferably formed in the form of an all-round material of the blade 40 and sidewalls delimited sink in the bottom 44 of the blade 40, wherein a provided for engagement in the recess 51 radially extreme end 52a of the bolt 52 is formed in its shape complementary to the shape of the recess 51. In the illustrated embodiment of the invention, the recess 51 is formed as a Hüllkontur or negative to the outer contour of a spherical cap (or ball segment or ball portion), wherein the radially outermost end 52a of the bolt 52 one of the outer contour of this
Kugelkalotte entsprechende Form aufweist. Mit anderen Worten ist die Ball dome corresponding shape. In other words, that is
Ausnehmung 51 als kugeliger Sitz für das etwa halbkugelförmige radial äußerste Ende 52a des Riegels 52 ausgebildet. Recess 51 is formed as a spherical seat for the approximately hemispherical radially outermost end 52 a of the bolt 52.
Im Fazit ist das erfindungsgemäße Laufrad 20 so konfiguriert, dass dessen Laufschaufeln 40 mit geringerem Zeitaufwand montierbar und demontierbar sind und mit definierter radialer Verspannung in ihren jeweiligen axial verlaufenden Nuten 32 fixierbar sind. In conclusion, the impeller 20 according to the invention is configured such that its moving blades 40 can be mounted and dismounted with less expenditure of time and can be fixed in their respective axially extending grooves 32 with a defined radial tension.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Turbomaschine1 turbomachine
10 Rotor 10 rotor
20 Laufrad  20 impeller
30 Radscheibe  30 wheel disc
30a seitliche Seite  30a lateral side
31 Außenumfang 31 outer circumference
32 Nut 32 groove
32a Boden  32a floor
33 Zahnprofil  33 tooth profile
40 Laufschaufel  40 bucket
41 Schaufelfuß  41 blade foot
43 Zahnprofil  43 tooth profile
44 Unterseite  44 bottom
50 Fixiereinrichtung 50 fixing device
51 Ausnehmung 51 recess
52 Riegel  52 bars
52a radial äußerstes Ende 52a radially outermost end
52b radial innerstes Ende52b radially innermost end
53 erste Passage53 first passage
53a erstes Längsende53a first longitudinal end
53b zweites Längsende53b second longitudinal end
60 Stellvorrichtung60 adjusting device
61 zweite Passage61 second passage
61 a erstes Längsende61 a first longitudinal end
62 Schraubenelement62 screw element
62a Längsende 62a longitudinal end
α Kegelwinkel α cone angle
AR Axialrichtung  AR axial direction
RR Radialrichtung  RR radial direction

Claims

Patentansprüche claims
1 . Laufrad (20) für einen Rotor (10) einer Turbomaschine (1 ), aufweisend: eine Radscheibe (30), die an einer Rotorwelle des Rotors (10) vorzusehen ist und die eine Mehrzahl von Nuten (32) hat, welche entlang eines 1 . An impeller (20) for a rotor (10) of a turbomachine (1), comprising: a wheel disc (30) to be provided on a rotor shaft of the rotor (10) and having a plurality of grooves (32) extending along one
Außenumfangs (31 ) der Radscheibe (30) verteilt angeordnet sind und welche sich jeweils in einer axial der Rotorwelle verlaufenden Dickenrichtung der Radscheibe (30) erstrecken,  Outer circumference (31) of the wheel disc (30) are arranged distributed and which each extend in an axially extending the rotor shaft thickness direction of the wheel disc (30),
wobei an zwei parallel zur Dickenrichtung verlaufenden einander  wherein at two parallel to the thickness direction extending each other
gegenüberliegenden Nutseiten jeder Nut (32) jeweils ein Zahnprofil (33) opposite groove sides of each groove (32) each have a tooth profile (33)
ausgebildet ist, is trained,
eine Mehrzahl von Laufschaufeln (40), von denen jede einen Schaufelfuß (41 ) mit zwei voneinander abgewandten parallel zur Dickenrichtung verlaufenden Schaufelfußseiten aufweist, an denen jeweils ein Zahnprofil (43) ausgebildet ist, wobei jede Laufschaufel (40) unter Ausbildung einer Laufschaufel-Nut- a plurality of blades (40) each having a blade root (41) with two blade end sides facing away from each other parallel to the thickness direction, on each of which a tooth profile (43) is formed, each blade (40) forming a blade groove -
Kombination mit ihrem Schaufelfuß (41 ) in eine jeweilige der Nuten (32) eingesetzt ist, so dass die Zahnprofile (43) der Schaufelfußseiten mit den Zahnprofilen (33) der Nutseiten in Eingriff stehen, und Combination with its blade root (41) is inserted into a respective one of the grooves (32), so that the tooth profiles (43) of the Schaufelfußseiten with the tooth profiles (33) of the groove sides are engaged, and
wobei jede Laufschaufel-Nut-Kombination eine Fixiereinrichtung (50) aufweist, die eingerichtet ist, die Laufschaufel (40) in der Nut (32) sowohl in wherein each blade-groove combination comprises fixing means (50) arranged to secure the blade (40) in the groove (32) both in
Dickenrichtung als auch in einer Radialrichtung (RR) der Radscheibe (30) gegen Bewegung zu fixieren, Thickness direction as well as in a radial direction (RR) of the wheel disc (30) to fix against movement,
dadurch gekennzeichnet, dass jede Fixiereinrichtung (50) eine zumindest in Dickenrichtung beidseitig geschlossene Ausnehmung (51 ) in einer einem Boden (32a) der Nut (32) zugewandten Unterseite (44) der Laufschaufel (40) und einen Riegel (52) aufweist, der im Boden (32a) der Nut (32) bewegbar aufgenommen ist, so dass der Riegel (52) in Radialrichtung (RR) gesteuert verstellbar ist zwischen einer Entriegelungsposition, in der der Riegel (52) nicht in die Ausnehmung (51 ) der Laufschaufel (40) eingreift, und einer Verriegelungsposition, in der der Riegel (52) radial in die Ausnehmung (51 ) der Laufschaufel (40) eingreift, so dass er die Laufschaufel (40) mit einer vorbestimmten Kraft nach radial außen drückt. characterized in that each fixing device (50) has an at least in the thickness direction on both sides closed recess (51) in a bottom (32 a) of the groove (32) facing bottom (44) of the blade (40) and a bolt (52), the in the bottom (32a) of the groove (32) is movably received, so that the latch (52) controlled in the radial direction (RR) is adjustable between an unlocking position in which the latch (52) is not in the recess (51) of the blade (51) 40), and a locking position in which the latch (52) radially engages the recess (51) of the blade (40) so as to urge the blade (40) radially outwardly with a predetermined force.
2. Laufrad (20) gemäß Anspruch 1 , wobei die Ausnehmung (51 ) in Form einer allseitig von Material der Laufschaufel (40) umgrenzten Senke in der Unterseite (44) der Laufschaufel (40) gebildet ist, und wobei ein zum Eingriff in der 2. impeller (20) according to claim 1, wherein the recess (51) in the form of an all-round material of the blade (40) bounded depression in the bottom (44) of the blade (40) is formed, and wherein a for engaging in the
Ausnehmung (51 ) vorgesehenes radial äußerstes Ende (52a) des Riegels (52) komplementär zu der Ausnehmung (51 ) ausgebildet ist. Recess (51) provided radially outermost end (52 a) of the bolt (52) complementary to the recess (51) is formed.
3. Laufrad (20) gemäß Anspruch 2, wobei die Ausnehmung (51 ) als Negativ zur Außenkontur einer Kugelkalotte ausgebildet ist, und wobei das radial äußerste Ende (52a) des Riegels (52) eine der Außenkontur dieser Kugelkalotte 3. impeller (20) according to claim 2, wherein the recess (51) is formed as a negative to the outer contour of a spherical cap, and wherein the radially outermost end (52 a) of the bolt (52) one of the outer contour of this spherical cap
entsprechende Form aufweist. has corresponding shape.
4. Laufrad (20) gemäß einem der Ansprüche 1 bis 3, wobei jede An impeller (20) according to any one of claims 1 to 3, wherein each
Fixiereinrichtung (50) in der Radscheibe (30) eine in Radialrichtung (RR) verlaufende erste Passage (53) aufweist, die an einem ersten Längsende (53a) dieser in die Nut (32) mündet und in die der Riegel (52) eingepasst ist. Fixing device (50) in the wheel disc (30) in the radial direction (RR) extending first passage (53) which at a first longitudinal end (53 a) thereof in the groove (32) opens and in which the bolt (52) is fitted ,
5. Laufrad (20) gemäß Anspruch 4, wobei jede Fixiereinrichtung (50) eine Stellvorrichtung (60) aufweist, die an einem zweiten Längsende (53b) der ersten Passage (53) zum gesteuerten Verstellen des Riegels (52) angeordnet ist, und wobei die Stellvorrichtung (60) eingerichtet ist, so dass sie von einer in An impeller (20) according to claim 4, wherein each fixing means (50) comprises an actuator (60) disposed at a second longitudinal end (53b) of the first passage (53) for controllably moving the bolt (52), and wherein the adjusting device (60) is arranged so that it can be moved from one in
Dickenrichtung weisenden seitlichen Seite (30a) der Radscheibe (30) aus zum Verstellen des Riegels (52) ansteuerbar ist. Thickness direction side facing side (30 a) of the wheel disc (30) from the adjustment of the bolt (52) can be controlled.
6. Laufrad (20) gemäß Anspruch 5, wobei die Stellvorrichtung (60) eine zweite Passage (61 ), die in Dickenrichtung der Radscheibe (30) verlaufend in dieser mit Innengewinde ausgebildet ist, so dass die erste Passage (53) mit ihrem zweiten Längsende (53b) in die zweite Passage (61 ) mündet und ein erstes Längsende (61 a) der zweiten Passage (61 ) in der seitlichen Seite (30a) der Radscheibe (30) mündet, und ein Schraubenelement (62) aufweist, das von der seitlichen Seite (30a) der Radscheibe (30) aus in die zweite Passage (61 ) eingeschraubt ist und das mit einem radial innersten Ende (52b) des Riegels (52) in Wirkverbindung steht, so dass eine Verlagerung des Schraubenelements (62) in Dickenrichtung der Radscheibe (30) eine Verlagerung des Riegels (52) in Radialrichtung bewirkt. 6. impeller (20) according to claim 5, wherein the adjusting device (60) has a second passage (61) in the thickness direction of the wheel disc (30) extending in this internally threaded, so that the first passage (53) with its second Longitudinal end (53b) opens into the second passage (61) and a first longitudinal end (61 a) of the second passage (61) in the lateral side (30 a) of the wheel disc (30) opens, and a screw member (62) from the lateral side (30 a) of the wheel disc (30) in the second passage (61) is screwed and which is in operative connection with a radially innermost end (52b) of the bolt (52), so that a displacement of the screw member (62) in the thickness direction of the wheel disc (30) causes a displacement of the bolt (52) in the radial direction ,
7. Laufrad (20) gemäß Anspruch 6, wobei ein zum Kontakt mit dem Riegel (52) vorgesehenes Längsende (62a) des Schraubenelements (62) mit einer ersten Kegelform ausgebildet ist, und wobei das radial innerste Ende (52b) des Riegels (52) mit einer zweiten Kegelform ausgebildet ist, so dass zwischen jeweiligen Mantelflächen der ersten und der zweiten Kegelform Linienberührung realisiert ist. The impeller (20) according to claim 6, wherein a longitudinal end (62a) of the screw member (62) provided for contact with the latch (52) is formed with a first conical shape, and wherein the radially innermost end (52b) of the latch (52 ) is formed with a second conical shape, so that line contact is realized between respective lateral surfaces of the first and the second conical shape.
8. Laufrad 20 gemäß Anspruch 7, wobei die erste Kegelform einen 8. impeller 20 according to claim 7, wherein the first cone shape a
Kegelwinkel (a) von etwa 20 Grad aufweist. Cone angle (a) of about 20 degrees.
9. Rotor (10) für eine Turbomaschine 1 , wobei der Rotor (10) wenigstens ein Laufrad (20) gemäß einem der Ansprüche 1 bis 8 aufweist. 9. rotor (10) for a turbomachine 1, wherein the rotor (10) has at least one impeller (20) according to one of claims 1 to 8.
10. Turbomaschine (1 ) mit einem Rotor (10), der wenigstens ein Laufrad (20) gemäß einem der Ansprüche 1 bis 8 aufweist. 10. turbomachine (1) with a rotor (10) having at least one impeller (20) according to one of claims 1 to 8.
EP13706262.6A 2012-03-07 2013-02-25 Impeller for a rotor of a turbomachine, and rotor and turbomachine having an impeller of said type Not-in-force EP2823153B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012203606A DE102012203606A1 (en) 2012-03-07 2012-03-07 Impeller for a rotor of a turbomachine and rotor and turbomachine with such an impeller
PCT/EP2013/053738 WO2013131774A1 (en) 2012-03-07 2013-02-25 Impeller for a rotor of a turbomachine, and rotor and turbomachine having an impeller of said type

Publications (2)

Publication Number Publication Date
EP2823153A1 true EP2823153A1 (en) 2015-01-14
EP2823153B1 EP2823153B1 (en) 2018-07-25

Family

ID=47750694

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13706262.6A Not-in-force EP2823153B1 (en) 2012-03-07 2013-02-25 Impeller for a rotor of a turbomachine, and rotor and turbomachine having an impeller of said type

Country Status (6)

Country Link
US (1) US9903205B2 (en)
EP (1) EP2823153B1 (en)
JP (1) JP6121455B2 (en)
CN (1) CN104160113B (en)
DE (1) DE102012203606A1 (en)
WO (1) WO2013131774A1 (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB790350A (en) * 1956-06-12 1958-02-05 Gen Motors Corp Improvements relating to elastic-fluid turbine wheels and the attachment of blades thereto
US2807436A (en) * 1952-03-25 1957-09-24 Gen Motors Corp Turbine wheel and bucket assembly
US2846183A (en) * 1952-07-18 1958-08-05 William C Morgan Retaining devices for turbine blades
BE537113A (en) * 1954-04-05
FR2120499A5 (en) * 1971-01-06 1972-08-18 Snecma
JPS59192801A (en) * 1983-04-15 1984-11-01 Hitachi Ltd Easily detachable moving blade fixing method
US4820127A (en) * 1988-01-29 1989-04-11 Westinghouse Electric Corp. Blade support and blade assembly
DE19603388C1 (en) * 1996-01-31 1997-07-24 Mtu Muenchen Gmbh Device for fixing the blades on the impeller, in particular a turbine of a gas turbine engine, by riveting
EP1619354B1 (en) * 2004-07-22 2008-04-09 Siemens Aktiengesellschaft Device for fixing a blade on a rotor disc of a turbomachine, turbomachine and method to assemble and disassemble a blade on a rotor disc of a turbomachine.
US8182230B2 (en) * 2009-01-21 2012-05-22 Pratt & Whitney Canada Corp. Fan blade preloading arrangement and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013131774A1 *

Also Published As

Publication number Publication date
CN104160113A (en) 2014-11-19
US20150030456A1 (en) 2015-01-29
EP2823153B1 (en) 2018-07-25
WO2013131774A1 (en) 2013-09-12
JP2015513032A (en) 2015-04-30
US9903205B2 (en) 2018-02-27
CN104160113B (en) 2016-03-02
JP6121455B2 (en) 2017-04-26
DE102012203606A1 (en) 2013-09-12

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