EP2379847B1 - Method for mounting an integral inner shroud of a turbocompressor stator - Google Patents

Method for mounting an integral inner shroud of a turbocompressor stator Download PDF

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Publication number
EP2379847B1
EP2379847B1 EP10702397.0A EP10702397A EP2379847B1 EP 2379847 B1 EP2379847 B1 EP 2379847B1 EP 10702397 A EP10702397 A EP 10702397A EP 2379847 B1 EP2379847 B1 EP 2379847B1
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EP
European Patent Office
Prior art keywords
inner ring
radius
ring
guide
vane
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EP10702397.0A
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German (de)
French (fr)
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EP2379847A1 (en
Inventor
Frank Stiehler
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MTU Aero Engines AG
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MTU Aero Engines GmbH
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Publication of EP2379847A1 publication Critical patent/EP2379847A1/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
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • F01D9/042—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators
    • 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
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/162—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/246—Fastening of diaphragms or stator-rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/64—Mounting; Assembling; Disassembling of axial pumps
    • F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
    • 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
    • Y10T29/49316—Impeller making
    • Y10T29/4932—Turbomachine making
    • Y10T29/49323—Assembling fluid flow directing devices, e.g., stators, diaphragms, nozzles

Definitions

  • the invention relates to a method for mounting an integral inner ring of a turbocompressor stator to a vane ring.
  • the vanes are mounted on a non-rotatable inner ring.
  • the inner ring is provided with openings (bearing countersinks) into which bearing bushes for the inner pins of the guide vanes can be inserted. Only when the guide vanes are inserted in the compressor housing, the installation (assembly) of the inner ring takes place.
  • assembly has hitherto been possible only in segments.
  • the inner ring is circumferentially divided into individual segments with a center angle ⁇ 180 °, and the segments with the openings are individually “threaded" into the inner cones of the vanes, as far as the gaps between the segments allow. In practice, therefore, the segments typically have a midpoint angle not greater than 30 °.
  • Such a segmented inner ring is for example in the EP 1 508 672 A1 shown.
  • a method for mounting a segmented inner ring without axial division is from DE 10 2006 024 085 A1 known. The method described therein makes use of the fact that the openings in the segments of the inner ring are significantly larger in diameter than the inner pins of the guide vanes, so that the latter can be temporarily positioned eccentrically and obliquely in the openings.
  • segmented inner rings have fundamental disadvantages compared to one-piece, closed (integral) inner rings.
  • the segmentation leads to greater wear and a significantly shorter service life.
  • the segmentation leads to an undesirable cluster swing.
  • the publication DE 21 52 365 discloses an assembly method for a multi-stage axial turbomachine. For attaching a sheathing ring of the semi-circular in the relaxed state shroud ring is pulled together at its ends via a rod construction.
  • the selected type of bias has the disadvantage that due to the provision of large tolerances of the assembly effort by increasing the number of parts is very large.
  • the object of the invention is to remedy this deficiency and to provide a method that allow easy assembly and possibly disassembly of a guide vanes bearing inner ring.
  • the invention is based on the recognition that an integral inner ring can be designed so deformable that the inner ring can be biased with a suitable geometric design of its openings and the inner pins of the vanes so that the deformation movement of the inner ring during its relaxation for threading the inner ring in the Guide vane ring can be used.
  • the die ensures that no overstretching of the inner ring occurs because it limits the bend to a defined radius.
  • an integral, that is undivided, one-piece inner ring 10 is provided with an outer radius R which is constant over the circumference.
  • a one-piece inner ring is to be understood here also a one-piece part ring with a center angle ⁇ 180 °.
  • the outer radius R of the inner ring 10 corresponds to an inner radius S of the Leitschaufelkranzes 12, to which the inner ring 10 is to be mounted.
  • the vane ring 12 is the entirety or, as described in the following assembly process, a part of the inner ring 10 to be held vanes 14, which are already pre-assembled in the tubular housing or in a housing part of the compressor.
  • the guide vane ring 12 is in the latter case a partial ring (preferably with a center angle ⁇ 180 °) of circumferentially juxtaposed vanes 14.
  • the vanes 14 have inner pins 16 which are to be stored in associated openings 18 (bearing depressions) of the inner ring 10.
  • the inner ring 10 is pre-bent by the inner ring 10 constant to an outer radius r is biased, which is smaller than the outer radius R of the inner ring 10 in the untensioned state.
  • the bias is applied over the entire circumference of the inner ring 10 or over a certain part, preferably over a part whose arc length of the arc length of the preassembled vane ring 12 corresponds (based on the radii R and S).
  • the inner ring 10 is brought into abutment with the die 20 at an inner contact point A.
  • the inner ring 10 is fixed with a clamping 22 with adjustable drawbar.
  • two further adjustable clamping units 24 are provided with which at two points of pull, which are preferably diametrically opposed to each other (center angle distance ⁇ 180 °), the inner ring 10 is bent onto the die 20.
  • the clamping units 24 can - according to the in FIG. 1 illustrated example - train bearing forming pins 26 and / or claws on which a tensile force is applied.
  • the clamping direction S is adjusted during pretensioning so that the inner ring 10 does not buckle, but applies uniformly to the die 20.
  • the clamping units 22 and 24 are then fixed, so that the inner ring 10 remains in its prestressed state.
  • FIGS. 2 and 3 show schematically how subsequently the inner ring 10 is threaded by relaxing on its original outer radius R in the vane part ring.
  • the biased inner ring 10 is attached to one end 28 of the vane ring 12 and unrolled in the vane ring 12 by the adjustable clamping units 22 and 24 are relieved (release the fixation).
  • the openings 18 of the inner ring 10 are moved without tilting or jamming over the inner pins 16 of the guide vanes 14. This is possible in the particular relaxation restoring deformation of the inner ring 10 to its original outer radius R alone due to the play of the openings 18.
  • the operating end position of the inner ring 10, in which the inner pins 16 and the openings 18 are aligned, is thus achieved solely by utilizing the bearing clearance and the deviation between the tensioned and the relaxed inner ring geometry.
  • the kinematic description of the rolling process is based on the model analysis FIG. 4 out. It follows that the rolling of the inner ring 10 in the vane ring is a Hypozykloidenterrorism, according to the rolling of a planetary gear in a ring gear. The trajectory of a fixed point of the inner ring 10 thus corresponds to a cycloid, which was generated on an inner circle with the radius Rr (relative to the central axis of the inner ring 10 and the Leitschaufelkranzes 12).
  • the disassembly of the inner ring 10 from the vane ring 12 is also possible by tilting or jamming by reversing the described assembly process.

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

Description

Die Erfindung betriff ein Verfahren zur Montage eines integralen Innenrings eines Turboverdichterstators an einen Leitschaufelkranz.The invention relates to a method for mounting an integral inner ring of a turbocompressor stator to a vane ring.

Bei Turboverdichtem für Gasturbinen, die einen beschaufelten Stator aufweisen, werden die Leitschaufeln auf einem drehfesten Innenring gelagert. Der Innenring ist mit Öffnungen (Lagersenkungen) versehen, in die Lagerbuchsen für die Innenzapfen der Leitschaufeln einsetzbar sind. Erst wenn die Leitschaufeln im Verdichtergehäuse eingesetzt sind, erfolgt die Installation (Montage) des Innenrings. Bei Innenringen ohne axiale Teilung ist die Montage bislang nur segmentweise möglich. Der Innenring ist in Umfangsrichtung in einzelne Segmente mit einem Mittelpunktswinkel < 180° unterteilt, und die Segmente mit den Öffnungen werden einzeln in die Innenzapfen der Leitschaufeln "eingefädelt", soweit die Spalte zwischen den Segmenten dies zulassen. In der Praxis weisen die Segmente daher in der Regel einen Mittelpunktswinkel auf, der nicht größer als 30° ist.In turbochargers for gas turbines, which have a bladed stator, the vanes are mounted on a non-rotatable inner ring. The inner ring is provided with openings (bearing countersinks) into which bearing bushes for the inner pins of the guide vanes can be inserted. Only when the guide vanes are inserted in the compressor housing, the installation (assembly) of the inner ring takes place. In the case of inner rings without axial division, assembly has hitherto been possible only in segments. The inner ring is circumferentially divided into individual segments with a center angle <180 °, and the segments with the openings are individually "threaded" into the inner cones of the vanes, as far as the gaps between the segments allow. In practice, therefore, the segments typically have a midpoint angle not greater than 30 °.

Ein solcher segmentierter Innenring ist beispielsweise in der EP 1 508 672 A1 gezeigt. Ein Verfahren zur Montage eines segmentierten Innenrings ohne axiale Teilung ist aus der DE 10 2006 024 085 A1 bekannt. Bei dem darin beschriebenen Verfahren wird ausgenutzt, dass die Öffnungen in den Segmenten des Innenrings im Durchmesser deutlich größer sind als die Innenzapfen der Leitschaufeln, so dass letztere zeitweilig exzentrisch und schräg in den Öffnungen positioniert sein können.Such a segmented inner ring is for example in the EP 1 508 672 A1 shown. A method for mounting a segmented inner ring without axial division is from DE 10 2006 024 085 A1 known. The method described therein makes use of the fact that the openings in the segments of the inner ring are significantly larger in diameter than the inner pins of the guide vanes, so that the latter can be temporarily positioned eccentrically and obliquely in the openings.

Segmentierte Innenringe haben jedoch im Vergleich zu einteiligen, geschlossenen (integralen) Innenringen grundsätzliche Nachteile. So führt die Segmentierung zu einem größeren Verschleiß und einer erheblich verkürzten Lebensdauer. Außerdem führt die Segmentierung zu einem unerwünschten Clusterschwingen.However, segmented inner rings have fundamental disadvantages compared to one-piece, closed (integral) inner rings. The segmentation leads to greater wear and a significantly shorter service life. In addition, the segmentation leads to an undesirable cluster swing.

Die Offenlegungsschrift DE 21 52 365 offenbart ein Montageverfahren für eine mehrstufige Axialturbomaschine. Zum Anbringen eines Ummantelungsrings wird der im entspannten Zustand halbkreisförmige Ummantelungsring an seinen Enden über eine Stangenkonstruktion zusammengezogen. Die gewählte Art der Vorspannung hat den Nachteil, dass aufgrund des Vorsehens großer Toleranzen der Montageaufwand durch eine Erhöhung der Teilezahl sehr groß ist.The publication DE 21 52 365 discloses an assembly method for a multi-stage axial turbomachine. For attaching a sheathing ring of the semi-circular in the relaxed state shroud ring is pulled together at its ends via a rod construction. The selected type of bias has the disadvantage that due to the provision of large tolerances of the assembly effort by increasing the number of parts is very large.

Bislang ist aber kein Verfahren bekannt, mit dem ein integraler Innenring ohne axiale Teilung in zufriedenstellender Weise montiert werden kann. Aufgabe der Erfindung ist es, diesen Mangel zu beheben und ein Verfahren anzugeben, das eine einfache Montage und ggf. Demontage eines Leitschaufeln tragenden Innenrings zu ermöglichen.So far, however, no method is known with which an integral inner ring without axial division can be mounted in a satisfactory manner. The object of the invention is to remedy this deficiency and to provide a method that allow easy assembly and possibly disassembly of a guide vanes bearing inner ring.

Gelöst wird diese Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1. Vorteilhafte und zweckmäßige Ausgestaltungen des erfindungsgemäßen Verfahrens ergeben sich aus den Unteransprüchen.This object is achieved by a method having the features of claim 1. Advantageous and expedient embodiments of the method according to the invention will become apparent from the dependent claims.

Das erfindungsgemäße Verfahren zur Montage eines integralen Innenrings eines Turboverdichterstators an einen Leitschaufelkranz weist folgende Schritte auf:

  • Bereitstellen des Leitschaufelkranzes mit einem inneren Radius S;
  • Bereitstellen des Innenrings mit einem äußeren Radius R, der dem inneren Radius S entspricht;
  • Vorspannen des Innenrings auf einen äußeren Radius r, der kleiner ist als der äußere Radius R des ungespannten Innenrings; und
  • Entspannen des Innenrings auf den äußeren Radius R.
The inventive method for mounting an integral inner ring of a turbocompressor stator to a vane ring comprises the following steps:
  • Providing the vane ring with an inner radius S;
  • Providing the inner ring with an outer radius R corresponding to the inner radius S;
  • Biasing the inner ring to an outer radius r smaller than the outer radius R of the unstressed inner ring; and
  • Relax the inner ring on the outer radius R.

Die Erfindung beruht auf der Erkenntnis, dass ein integraler Innenring so verformbar gestaltet werden kann, dass der Innenring bei geeigneter geometrischer Auslegung seiner Öffnungen und der Innenzapfen der Leitschaufeln so vorgespannt werden kann, dass die Verformungsbewegung des Innenrings bei dessen Entspannung zum Einfädeln des Innenrings in den Leitschaufelkranz genutzt werden kann.The invention is based on the recognition that an integral inner ring can be designed so deformable that the inner ring can be biased with a suitable geometric design of its openings and the inner pins of the vanes so that the deformation movement of the inner ring during its relaxation for threading the inner ring in the Guide vane ring can be used.

Besonders vorteilhaft ist beim Vorspannen des Innenrings die Verwendung einer Matrize mit einem Radius, deren Außenradius kleiner ist als der äußere Radius R des ungespannten Innenrings abzüglich dessen radialer Dicke. Die Matrize stellt sicher, dass keine Überdehnung des Innenrings auftritt, da sie die Biegung auf einen definierten Radius begrenzt.Particularly advantageous when biasing the inner ring, the use of a die with a radius whose outer radius is smaller than the outer radius R of the unstressed inner ring minus its radial thickness. The die ensures that no overstretching of the inner ring occurs because it limits the bend to a defined radius.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus den beigefügten Zeichnungen, auf die Bezug genommen wird. In den Zeichnungen zeigen:

Figur 1
eine Draufsicht auf eine Matrize und eines Teils eines Innenrings vor dessen Vorbiegung;
Figur 2
eine schematische Teilansicht eines Leitschaufelkranzes mit einseitig angesetztem Innenring;
Figur 3
eine größere schematische Teilansicht des Leitschaufelkranzes mit teilweise eingefädeltem Innenring; und
Figur 4
das geometrische Modell, das dem erfindungsgemäßen Verfahren zugrunde liegt.
Further features and advantages of the invention will become apparent from the following description and from the accompanying drawings, to which reference is made. In the drawings show:
FIG. 1
a plan view of a die and a part of an inner ring before its pre-bending;
FIG. 2
a schematic partial view of a vane ring with one side attached inner ring;
FIG. 3
a larger schematic partial view of the vane ring with partially threaded inner ring; and
FIG. 4
the geometric model underlying the method according to the invention.

Das erfindungsgemäße Verfahren zur Montage eines integralen Innenrings eines Turboverdichterstators an einen Leits chaufelkranz wird im Folgenden anhand der Figuren 1 bis 4 näher erläutert.The inventive method for mounting an integral inner ring of a turbocompressor to a Leitsch chaufelkranz will be described below with reference to the FIGS. 1 to 4 explained in more detail.

Zunächst wird ein integraler, also ungeteilter, einstückiger Innenring 10 mit einem über den Umfang konstanten äußeren Radius R bereitgestellt. Unter einem einstückigen Innenring soll hier auch ein einstückiger Teilring mit einem Mittelpunktswinkel ≥ 180° verstanden werden. Der äußere Radius R des Innenrings 10 entspricht einem inneren Radius S des Leitschaufelkranzes 12, an den der Innenring 10 montiert werden soll.First, an integral, that is undivided, one-piece inner ring 10 is provided with an outer radius R which is constant over the circumference. Under a one-piece inner ring is to be understood here also a one-piece part ring with a center angle ≥ 180 °. The outer radius R of the inner ring 10 corresponds to an inner radius S of the Leitschaufelkranzes 12, to which the inner ring 10 is to be mounted.

Der Leitschaufelkranz 12 ist die Gesamtheit oder, wie im folgenden Montageverfahren beschrieben, ein Teil der vom Innenring 10 zu haltenden Leitschaufeln 14, die im rohrförmigen Gehäuse bzw. in einem Gehäuseteil des Verdichters bereits vormontiert sind. Der Leitschaufelkranz 12 ist in letzterem Fall ein Teilring (vorzugsweise mit einem Mittelpunktswinkel ≈ 180°) von in Umfangsrichtung nebeneinander angeordneten Leitschaufeln 14. Die Leitschaufeln 14 weisen Innenzapfen 16 auf, die in zugeordneten Öffnungen 18 (Lagersenkungen) des Innenrings 10 gelagert werden sollen.The vane ring 12 is the entirety or, as described in the following assembly process, a part of the inner ring 10 to be held vanes 14, which are already pre-assembled in the tubular housing or in a housing part of the compressor. The guide vane ring 12 is in the latter case a partial ring (preferably with a center angle ≈ 180 °) of circumferentially juxtaposed vanes 14. The vanes 14 have inner pins 16 which are to be stored in associated openings 18 (bearing depressions) of the inner ring 10.

Unter dem äußeren Radius R des Innenrings 10 und dem inneren Radius S des Leitschaufelkranzes 12 sind von der axialen Mittelachse des Verdichtergehäuses gemessene Radien zu verstehen, die im montierten Zustand des Innenrings 10 zusammenfallen. Konkret sind dies der halbe Außendurchmesser des Innenrings 10 und ein Radius im Bereich der Innenzapfen 16 der Leitschaufeln 14. (Der Einfachheit halber sind in den Zeichnungen - mit Ausnahme der Figur 4 - nicht die Radien selbst, sondern die zugehörigen Bogenlinien mit R, S (und später mit r) bezeichnet).Under the outer radius R of the inner ring 10 and the inner radius S of the vane ring 12 are to be understood by the axial center axis of the compressor housing measured radii, which coincide in the assembled state of the inner ring 10. Concretely, these are half the outer diameter of the inner ring 10 and a radius in the region of the inner pins 16 of the guide vanes 14. (For the sake of simplicity, in the drawings - with the exception of FIG. 4 - not the radii themselves, but the associated arc lines with R, S (and later with r)).

Mittels einer Matrize 20 in Form einer Scheibe oder eines Scheibenrings oder eines entsprechenden Segments mit einem Außenradius, der kleiner ist als der äußere Radius R des Innenrings 10 abzüglich dessen radialer Dicke, wird der Innenring 10 vorgebogen, indem der Innenring 10 konstant auf einen äußeren Radius r vorgespannt wird, der kleiner ist als der äußere Radius R des Innenrings 10 im ungespannten Zustand. Die Vorspannung erfolgt über den gesamten Umfang des Innenrings 10 oder über einen bestimmten Teil, vorzugsweise über einen Teil, dessen Bogenlänge der Bogenlänge des vormontierten Leitschaufelkranzes 12 entspricht (bezogen auf die Radien R bzw. S).By means of a die 20 in the form of a disc or a disc ring or a corresponding segment with an outer radius which is smaller than the outer radius R of the inner ring 10 minus its radial thickness, the inner ring 10 is pre-bent by the inner ring 10 constant to an outer radius r is biased, which is smaller than the outer radius R of the inner ring 10 in the untensioned state. The bias is applied over the entire circumference of the inner ring 10 or over a certain part, preferably over a part whose arc length of the arc length of the preassembled vane ring 12 corresponds (based on the radii R and S).

Wie in Figur 1 gezeigt wird der Innenring 10 hierzu an einem inneren Anlagepunkt A in Anlage mit der Matrize 20 gebracht. Dort wird der Innenring 10 mit einer Verklammerung 22 mit verstellbarem Zuggestänge fixiert. Neben dieser Verklammerung 22 sind zwei weitere verstellbare Spanneinheiten 24 vorgesehen, mit denen an zwei Zugpunkten, die einander vorzugsweise diametral gegenüberliegen (Mittelpunktswinkelabstand ≈ 180°), der Innenring 10 auf die Matrize 20 gebogen wird. Die Spanneinheiten 24 können - gemäß dem in Figur 1 dargestellten Beispiel - Zuglager bildende Stifte 26 und/oder Krallen aufweisen, auf die eine Zugkraft aufgebracht wird. Die Spannrichtung S wird beim Vorspannen so eingestellt, dass sich der Innenring 10 nicht ausbeult, sondern gleichmäßig an die Matrize 20 anlegt. Die Spanneinheiten 22 und 24 werden anschließend fixiert, sodass der Innenring 10 in seinem vorgespannten Zustand verbleibt.As in FIG. 1 For this purpose, the inner ring 10 is brought into abutment with the die 20 at an inner contact point A. There, the inner ring 10 is fixed with a clamping 22 with adjustable drawbar. In addition to this clamping 22, two further adjustable clamping units 24 are provided with which at two points of pull, which are preferably diametrically opposed to each other (center angle distance ≈ 180 °), the inner ring 10 is bent onto the die 20. The clamping units 24 can - according to the in FIG. 1 illustrated example - train bearing forming pins 26 and / or claws on which a tensile force is applied. The clamping direction S is adjusted during pretensioning so that the inner ring 10 does not buckle, but applies uniformly to the die 20. The clamping units 22 and 24 are then fixed, so that the inner ring 10 remains in its prestressed state.

Die Figuren 2 und 3 zeigen schematisch, wie anschließend der Innenring 10 durch Entspannen auf seinen ursprünglichen Außenradius R in den Leitschaufel-Teilring eingefädelt wird. Der vorgespannte Innenring 10 wird an einem Ende 28 des Leitschaufelkranzes 12 angesetzt und im Leitschaufelkranz 12 abgerollt, indem die verstellbaren Spanneinheiten 22 und 24 entlastet werden (Lösen der Fixierung). Dabei werden die Öffnungen 18 des Innenrings 10 ohne Verkanten oder Verklemmen über die Innenzapfen 16 der Leitschaufeln 14 bewegt. Dies ist bei der besonderen Entspannungsrückverformung des Innenrings 10 auf seinen ursprünglichen Außenradius R alleine aufgrund des Spiels der Öffnungen 18 möglich.The FIGS. 2 and 3 show schematically how subsequently the inner ring 10 is threaded by relaxing on its original outer radius R in the vane part ring. The biased inner ring 10 is attached to one end 28 of the vane ring 12 and unrolled in the vane ring 12 by the adjustable clamping units 22 and 24 are relieved (release the fixation). In this case, the openings 18 of the inner ring 10 are moved without tilting or jamming over the inner pins 16 of the guide vanes 14. This is possible in the particular relaxation restoring deformation of the inner ring 10 to its original outer radius R alone due to the play of the openings 18.

In Figur 3 ist gezeigt, wie am tangentialen Berührungspunkt P der Außenradius des Innenrings ohne Übergang vom kleineren Radius r (vorgespannt) unmittelbar auf den ursprünglichen Radius R (entspannt) wechselt. Während also das Abrollen des Innenrings 10 im Leitschaufelkranz 12 kontinuierlich erfolgt, vollführt der Radius des Innenrings 10 am mitlaufenden tangentialen Berührungspunkt P einen Krümmungssprung von r auf R.In FIG. 3 It is shown how at the tangential contact point P, the outer radius of the inner ring without transition from the smaller radius r (biased) directly to the original radius R (relaxed) changes. Thus, while the rolling of the inner ring 10 in the vane ring 12 takes place continuously, the radius of the inner ring 10 performs a curvature jump from r to R at the tangential tangential point of contact P.

Die Betriebsendlage des Innenrings 10, in der die Innenzapfen 16 und die Öffnungen 18 fluchten, wird somit alleine unter Ausnutzung des Lagersenkungsspiels und der Abweichung zwischen der gespannten und der entspannten Innenringgeometrie erreicht.The operating end position of the inner ring 10, in which the inner pins 16 and the openings 18 are aligned, is thus achieved solely by utilizing the bearing clearance and the deviation between the tensioned and the relaxed inner ring geometry.

Die kinematische Beschreibung des Abrollvorgangs geht aus der Modellbetrachtung gemäß Figur 4 hervor. Daraus ergibt sich, dass das Abrollen des Innenrings 10 im Leitschaufelkranz eine Hypozykloidenbewegung darstellt, entsprechend dem Abrollen eines Planetenrads in einem Zahnkranz. Die Bewegungsbahn eins festen Punktes des Innenrings 10 entspricht demnach einer Zykloide, die auf einem Innenkreis mit dem Radius R-r (bezogen auf die Mittelachse des Innenrings 10 bzw des Leitschaufelkranzes 12) erzeugt wurde.The kinematic description of the rolling process is based on the model analysis FIG. 4 out. It follows that the rolling of the inner ring 10 in the vane ring is a Hypozykloidenbewegung, according to the rolling of a planetary gear in a ring gear. The trajectory of a fixed point of the inner ring 10 thus corresponds to a cycloid, which was generated on an inner circle with the radius Rr (relative to the central axis of the inner ring 10 and the Leitschaufelkranzes 12).

Die Demontage des Innenrings 10 vom Leitschaufelkranz 12 ist durch Umkehrung des beschriebenen Montagevorgangs ebenfalls ohne Verkanten oder Verklemmen möglich.The disassembly of the inner ring 10 from the vane ring 12 is also possible by tilting or jamming by reversing the described assembly process.

Claims (13)

  1. Method for mounting an integral inner ring (10) of a turbo-compressor stator onto a guide-vane ring (12), having the following steps:
    - providing the guide-vane ring (12) that has an inner radius S;
    - providing the inner ring (10) that has an outer radius R that corresponds to the inner radius S;
    - pre-tensioning the inner ring (10), and
    - unwinding the inner ring (10) in the guide-vane ring (12) by relaxing the inner ring (10) to the outer radius R,
    characterised in that during the step of pre-tensioning the inner ring (10) there is pre-tensioning to an outer radius r that is constant over the circumference of the inner ring (10) and is smaller than the outer radius R of the non-tensioned inner ring (10).
  2. Method according to claim 1, characterised in that when the inner ring (10) is relaxed at a tangential contact point P the outer radius of the inner ring (10) executes a curvature jump from the radius r directly to the radius R.
  3. Method according to claim 1 or 2, characterised in that in order to pre-tension the inner ring (10) a die plate (20) that has a radius is used, the outer radius of which is smaller than the outer radius R of the non-tensioned inner ring (10) minus its radial thickness.
  4. Method according to claim 3, characterised in that the inner ring (10) is brought into abutment with the die plate (20) at an inner abutment point A and is there fixed with a clamping portion (22).
  5. Method according to claim 3 or 4, characterised in that the pre-tensioning of the inner ring (10) is applied with the aid of at least two tensioning units (24) that act at traction points on the inner ring (10) preferably lying diametrically opposite each other.
  6. Method according to claim 5, characterised in that the tensioning direction of the tractive forces applied to the traction points is set in such a way that the inner ring (10) does not bulge out and uniformly abuts the die plate (20).
  7. Method according to claim 5 or 6, characterised in that in order to relax the inner ring (10) the tensioning units (24) and, if applicable, traction rods coupled to the clamping portion (22) are relieved.
  8. Method according to one of the preceding claims, characterised in that the outer radius R is half the outer diameter of the inner ring (10), and the inner radius S is a radius measured from the axial central axis of a housing in the region of the inner pins (16) of the guide vanes (14).
  9. Method according to one of the preceding claims, characterised in that the guide-vane ring (12) is a partial ring which comprises a portion of guide vanes (14), pre-mounted in a housing or housing portion, with inner pins (16).
  10. Method according to claim 9, characterised in that the guide-vane ring (12) has a centre-point angle of approximately 180°.
  11. Method according to claim 9 or 10, characterised in that the inner ring (10) is pre-tensioned over an arc length relative to its radius R that corresponds to the arc length of the guide-vane ring (12) relative to its radius S.
  12. Method according to one of claims 9 to 11, characterised in that during the relaxation the inner ring (10) is set at one end (28) of the guide-vane ring (12) and is unwound in the guide-vane ring (12) in such a way that the path of movement of a fixed point of the inner ring (10) corresponds to a cycloid.
  13. Method according to claim 12, characterised in that the cycloid is generated on an inner circle with the radius R-r.
EP10702397.0A 2009-01-16 2010-01-14 Method for mounting an integral inner shroud of a turbocompressor stator Active EP2379847B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009004934.7A DE102009004934B4 (en) 2009-01-16 2009-01-16 Method for assembling an integral inner ring of a turbo compressor stator
PCT/DE2010/000023 WO2010081468A1 (en) 2009-01-16 2010-01-14 Method for mounting an integral inner ring of a turbocompressor stator

Publications (2)

Publication Number Publication Date
EP2379847A1 EP2379847A1 (en) 2011-10-26
EP2379847B1 true EP2379847B1 (en) 2013-06-12

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EP10702397.0A Active EP2379847B1 (en) 2009-01-16 2010-01-14 Method for mounting an integral inner shroud of a turbocompressor stator

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US (1) US8943689B2 (en)
EP (1) EP2379847B1 (en)
CA (1) CA2746134C (en)
DE (1) DE102009004934B4 (en)
WO (1) WO2010081468A1 (en)

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EP2725202A1 (en) 2012-10-25 2014-04-30 MTU Aero Engines GmbH Inner ring seal support arrangement for an adjustable stator blade assembly of a turbomachine
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FR3122668B1 (en) * 2021-05-04 2023-05-26 Safran Aircraft Engines Method for mounting an abradable element comprising a honeycomb structure in an annular groove of a turbomachine member

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Also Published As

Publication number Publication date
CA2746134C (en) 2017-01-03
DE102009004934B4 (en) 2021-08-26
EP2379847A1 (en) 2011-10-26
DE102009004934A1 (en) 2010-08-19
CA2746134A1 (en) 2010-07-22
US8943689B2 (en) 2015-02-03
WO2010081468A1 (en) 2010-07-22
US20110265328A1 (en) 2011-11-03

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