EP2816198B1 - Guide vane assembly, guide vane and method for mounting a guide vane - Google Patents

Guide vane assembly, guide vane and method for mounting a guide vane Download PDF

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Publication number
EP2816198B1
EP2816198B1 EP14172250.4A EP14172250A EP2816198B1 EP 2816198 B1 EP2816198 B1 EP 2816198B1 EP 14172250 A EP14172250 A EP 14172250A EP 2816198 B1 EP2816198 B1 EP 2816198B1
Authority
EP
European Patent Office
Prior art keywords
guide vane
bushing
inner ring
additional
journal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP14172250.4A
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German (de)
French (fr)
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EP2816198A1 (en
Inventor
Stephan Klän
Norbert Schinko
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.)
MTU Aero Engines AG
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MTU Aero Engines AG
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Publication of EP2816198A1 publication Critical patent/EP2816198A1/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
    • 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
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/001—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between stator blade and rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/60—Assembly methods
    • 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
    • Y10T29/49321—Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member

Definitions

  • the invention relates to a vane assembly according to the preamble of claim 1, a vane for such a vane assembly, and a method of mounting such a vane.
  • turbomachines have an axially flow-through housing, to which at least one stator is attached, which has a plurality of adjacently arranged in the circumferential direction vanes.
  • the vanes have at their radially inner end an end portion which may be releasably connected to a seal carrier.
  • the seal carrier serves to seal a gap between the vane, in particular the end portion, and a rotor of the turbomachinery.
  • Guide vanes which can be adjusted about their longitudinal axis are movably connected at its radial end with an inner ring segment as the end portion.
  • a radially inner end of the vane such as a spigot provided on the airfoil, is received in a bushing which is fixed by the inner ring segment.
  • the inner ring segment is in turn releasably connected to a seal carrier segment. The fixation of the guide vane in the radial direction in the inner ring segment must be such that it is ensured that the vane can be adjusted about its own longitudinal axis.
  • a vane which has at its radially inner end a transverse bearing element in the form of a spherical disk.
  • the spherical disc is introduced into a bearing receptacle provided in the inner ring segment.
  • a disadvantage of the aforementioned connection is in particular that the components that are required for the movable mounting of the guide vane on the inner ring segment, require a lot of space.
  • a turbomachine stator blade having an ankle bolt carrying a bushing rotatable in an inner ring is known, the ankle bolt being in the form of a pin laterally delimited by two parallel sides.
  • An object of one embodiment of the present invention is to provide an improved turbomachine having at least one vane assembly.
  • An object of an embodiment of the present invention is in particular to provide a guide blade, which requires less space for the fixation or storage on the inner ring segment. Additionally or alternatively, an object of an embodiment of the present invention may be to provide a method by which the vane can be easily connected to the inner ring segment.
  • a vane arrangement with one or more vanes is provided.
  • At least one vane has a radially inner pin which engages a bore of a bushing disposed in a bore of an inner ring segment.
  • the spigot may extend radially inward from a radially inner end of a vane blade of the vane.
  • a rotationally fixed connection is provided between the bushing and the bore of the inner ring segment a sliding bearing in the direction of rotation about the bore or adjustment axis.
  • the inner ring segment in the circumferential direction on a plurality of holes, at least in two, in particular in the two outer circumferential or frontal, bores bushings are slidably mounted, engage in the bores pins of vanes, which are rotatably connected to this socket.
  • the pins of one or more, in particular all, further vanes of the inner ring segment may be rotatably connected in the same manner with bushings which are slidably mounted in bores of the inner ring segment.
  • the pins of one or more, in particular all, further, in particular in the circumferential direction inner vanes of the inner ring segment are rotatable or slidably mounted in their sockets, which in turn may be slidably mounted in bores of the inner ring segment.
  • connection As a rotationally fixed connection between a pin and a socket, in particular a connection is understood, in which the pin and the sleeve relative to each other, at least substantially or macroscopically, can not rotate.
  • the sliding bearing between a bushing and a bore of the inner ring segment may be formed in one embodiment by a clearance fit.
  • Such a vane arrangement may have the advantage that by the use of the rotationally fixed connection between one or more pin and the respective bushing and by the sliding bearing between this bushing or these bushes and the respective bore of the inner ring segment of the assembly of the vane assembly, in particular the installation of the guide vane in the inner ring segment is simplified.
  • a fixing of the guide vane in the radial direction can be achieved.
  • the guide vane assembly, in particular the vane of the inner ring segment can be dismantled in a simpler manner.
  • the space required for the components required for fixing is low in one embodiment, so that advantageously also a plurality of guide vanes can be coupled to the same inner ring segment.
  • Another advantage of the aforementioned vane arrangement may be that rotate due to the rotationally fixed connection between at least one vane and its socket in an adjustment of the vane about its longitudinal axis both the vane and the socket.
  • Rotation of the bushing has the advantage that wear occurs primarily on the bushing and not on the journal of the blade, as is known in the art.
  • the rotationally fixed connection between the pin of the guide vane and the bush advantageously increases the span of the storage.
  • the pin may have an external thread and the socket have a screwed or screwed internal thread.
  • a threaded sleeve may be arranged between the pin and the bush, which may be rotatably connected to the pin and / or the socket.
  • the pin can be connected to the threaded sleeve by a screw connection.
  • the bush can be connected to the threaded sleeve by a screw connection.
  • the pin may have an external thread which is screwed or screwed to an internal thread of a nut.
  • the nut can be supported against the bush, in particular in a state bolted to the journal.
  • the nut may be arranged on the side facing away from the blade of the vane side of the bushing.
  • connection possibilities may be that the guide vane can be connected in a simple manner to the inner ring segment, in particular the bushing, in a rotationally fixed manner.
  • a screw lock can be provided to secure the screw.
  • the screw lock prevents loosening of the screw connection between the guide vane and the inner ring segment.
  • a secure connection between the vane and the inner ring segment is ensured by the screw lock.
  • the screw lock can have a splint lock and / or a pin lock and / or a snap ring lock and / or a safety wire.
  • the inner ring segment can be releasably connected to a seal carrier segment, in particular by a positive connection. Furthermore, the inner ring segment may be coupled to at least one vane.
  • the seal carrier segment may include a sealant extending from the seal carrier segment in a direction away from the inner ring segment.
  • the seal carrier segment in particular the sealing means, serves to seal a gap between the guide vane, in particular the inner carrier segment, and a rotor of the turbomachine.
  • a vane which has a pin with an external thread.
  • the pin may protrude from the radially inner end of the airfoil.
  • the pin can be stirred into the bore of the bush, which is arranged in the bore of the inner ring segment.
  • the vane assembly or vane described above may be used in a gas turbine, particularly an aircraft engine, having at least one compressor and / or turbine stage.
  • the use of the vane assembly or vane is not limited to the gas turbine and aircraft engine, but may be used in other turbomachinery.
  • the mounting of at least one vane into an inner ring segment can be carried out as follows: The vane of the vane is inserted into the bore of the bush, which in one embodiment is already located in the bore of the inner ring segment. In another embodiment, first, the pin of the vane in the bore introduced the sleeve, which is then arranged in the bore of the inner ring segment wind. Similarly, the insertion of the pin into the bushing and the bushing in the inner ring segment can also be performed together, at least substantially.
  • the pin is fixed in rotation with the socket.
  • the rotation can be done in particular by a screw or screwing.
  • the bush is slidably mounted with the inner ring segment.
  • the sliding bearing of the sleeve with the inner ring segment as stated above, before or at the same time or after the rotation of the pin with the bushing.
  • Dismantling can be done in an embodiment in reverse order.
  • An otherwise not shown turbomachine has a plurality of offset in the axial direction of the turbomachine to each other arranged impellers and guide wheels.
  • the guide wheels are each arranged between two wheels along the axial direction of the turbomachine and have a plurality of guide vanes 110 in the circumferential direction.
  • illustrated guide vanes 110 are those which are adjustable about its longitudinal axis.
  • the vanes 110 are connected at their radially inner end with an inner ring segment 2.
  • a flange 30 of the bushing 3 protrudes in the radial direction from the inner ring segment 2.
  • the illustrated inner ring segment 2 is part of an inner ring, which is composed of a plurality of circumferentially adjacent inner ring segments 2.
  • Fig. 2 11 shows a side sectional view of a plurality of circumferentially adjacent vanes 110.
  • Each vane 110 includes an airfoil having a peg 111 at the radially inner end.
  • the pin 111 protrudes from the blade in the radial direction and engages in a bore of a bushing 3 a.
  • the bushes 3 are arranged in bores of the inner ring segment 2.
  • the pins 111 of the circumferentially outer vanes each have an external thread, which is in engagement with an internal thread of the respective bushing 3.
  • the bushes 3 are slidably mounted in bores of the inner ring segment 2. This means that the bushes 3 can rotate relative to the inner ring segment 2. At the same time it is ensured that no relative movement between the circumferentially outer bushes 3 and the outer circumferential guide vanes 110, in particular their pin 111, is possible.
  • the pins 111 of the other or circumferentially inner vanes (second to seventh vane in Fig. 2 ) have no external thread, but are slidably mounted in the bores of the respective sleeve 3. These bushes 3 are in turn slidably mounted in holes of the inner ring segment 2 or rotationally fixed. Likewise, these pins 111 may be rotationally fixed in the bores of the respective bushing 3, which in turn are slidably mounted in bores of the inner ring segment 2.
  • the inner ring segment 2 is connected to a seal carrier segment 4.
  • the seal carrier segment 4 is part of a seal carrier, which has a plurality of circumferentially adjacent seal carrier segments 4.
  • only the two outer pins 111 of an inner ring segment can be screwed to the bushings 3.
  • the screw can be secured by splint 33 against untwisting.
  • FIG. 3 an enlarged view of a compound of a circumferentially outer stator blade 110 with the inner ring segment 2 is shown.
  • the seal carrier segment 4 has a bottom, from which a sealing means 40 extends in a direction remote from the inner ring segment 2 direction. Further, extending from the seal carrier segment 4, two flanks, which are detachably connected at their respective end remote from the bottom of the seal carrier segment 4 via a positive connection with the inner ring segment 2.
  • the flange 30 of the bushing 3 protrudes from the inner ring segment 2 and projects transversely to a longitudinal axis of the bushing 3.
  • a sliding ring 5 is provided, which is arranged between the bushing 3 and the blade of the guide blade 110 is.
  • a screw lock is provided to prevent unscrewing the screw connection between the pin 111 and the socket 3.
  • the screw lock serves to prevent relative movement between the pin 111 and the socket 3.
  • the in FIG. 3 illustrated screw lock according to a first embodiment corresponds to a splint lock.
  • a recess is provided in the bushing 3, the pin 111 and a part of the inner ring segment 2, into or through which a split pin 33 can be inserted in order to realize the aforementioned securing.
  • FIG. 4 a screw lock according to a second embodiment is shown.
  • the screw lock has a locking pin 7, which is inserted into a gap between the pin 111 and the socket 3.
  • FIG. 5 a screw lock according to a third embodiment is shown.
  • the fuse wire 8 is arranged in receptacles in the socket 3 and coupled to the pin 111.

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

Description

Die Erfindung betrifft eine Leitschaufelanordnung nach dem Oberbegriff des Patentanspruchs 1, eine Leitschaufel für eine solche Leitschaufelanordnung und ein Verfahren zum Befestigen bzw. Montieren einer solchen Leitschaufel.The invention relates to a vane assembly according to the preamble of claim 1, a vane for such a vane assembly, and a method of mounting such a vane.

Aus dem Stand der Technik ist bereits eine Mehrzahl von unterschiedlich ausgebildeten Turbomaschinen bekannt. Die Turbomaschinen weisen ein axial durchströmbare Gehäuse auf, an welchen wenigstens ein Leitrad befestigt ist, das eine Mehrzahl von in Umfangsrichtung benachbart angeordneten Leitschaufeln aufweiset. Die Leitschaufeln weisen an ihrem radial inneren Ende einen Endabschnitt auf, der mit einem Dichtungsträger lösbar verbunden sein kann. Der Dichtungsträger dient zum Abdichten eines Spalts zwischen der Leitschaufel, insbesondere dem Endabschnitt, und einem Rotor der Turbomaschinen.From the prior art, a plurality of differently shaped turbomachines is already known. The turbomachines have an axially flow-through housing, to which at least one stator is attached, which has a plurality of adjacently arranged in the circumferential direction vanes. The vanes have at their radially inner end an end portion which may be releasably connected to a seal carrier. The seal carrier serves to seal a gap between the vane, in particular the end portion, and a rotor of the turbomachinery.

Leitschaufeln, die um deren Längsachse verstellt werden können, sind an ihrem radialen Ende mit einem Innenringsegment als Endabschnitt beweglich verbunden. Nach betriebsinterner Praxis ist ein radial inneres Ende der Leitschaufel, wie beispielsweise ein am Schaufelblatt vorgesehener Zapfen, in einer Buchse aufgenommen, die durch das Innenringsegment fixiert wird. Das Innenringsegment ist wiederum mit einem Dichtungsträgersegment lösbar verbunden. Die Fixierung der Leitschaufel in radialer Richtung in dem Innenringsegment muss derart erfolgen, dass sichergestellt ist, dass die Leitschaufel um die eigene Längsachse verstellt werden kann.Guide vanes, which can be adjusted about their longitudinal axis are movably connected at its radial end with an inner ring segment as the end portion. According to in-house practice, a radially inner end of the vane, such as a spigot provided on the airfoil, is received in a bushing which is fixed by the inner ring segment. The inner ring segment is in turn releasably connected to a seal carrier segment. The fixation of the guide vane in the radial direction in the inner ring segment must be such that it is ensured that the vane can be adjusted about its own longitudinal axis.

Aus der DE 10 2009 038 623 A1 ist eine Leitschaufel bekannt, die an ihrem radial inneren Ende ein Querlagerelement in Form einer Kugelscheibe aufweist. Zum Lagern der Leitschaufel an dem Innenringsegment wird die Kugelscheibe in eine in dem Innenringsegment vorgesehene Lageraufnahme eingebracht.From the DE 10 2009 038 623 A1 a vane is known which has at its radially inner end a transverse bearing element in the form of a spherical disk. To store the guide vane on the inner ring segment, the spherical disc is introduced into a bearing receptacle provided in the inner ring segment.

Nachteilig an der zuvor genannten Verbindung ist insbesondere, dass die Komponenten, die für die bewegliche Lagerung der Leitschaufel an dem Innenringsegment benötigt werden, viel Bauraum benötigen.A disadvantage of the aforementioned connection is in particular that the components that are required for the movable mounting of the guide vane on the inner ring segment, require a lot of space.

Aus der EP 0 204 615 A1 ist eine Statorschaufel für Turbomaschinen mit einem Fußgelenkbolzen bekannt, der eine Buchse trägt, die in einem Innenring drehbar ist, wobei der Fußgelenkbolzen die Form eines Zapfens hat, der seitlich durch zwei parallele Seiten begrenzt ist.From the EP 0 204 615 A1 For example, a turbomachine stator blade having an ankle bolt carrying a bushing rotatable in an inner ring is known, the ankle bolt being in the form of a pin laterally delimited by two parallel sides.

Eine Aufgabe einer Ausführung der vorliegenden Erfindung besteht darin, eine verbesserte Turbomaschine mit wenigstens einer Leitschaufelanordnung bereitzustellen. Eine AufgabeIt is an object of one embodiment of the present invention to provide an improved turbomachine having at least one vane assembly. A task

Eine Aufgabe einer Ausführung der vorliegenden Erfindung besteht darin, eine verbesserte Turbomaschine mit wenigstens einer Leitschaufelanordnung bereitzustellen. Eine Aufgabe einer Ausführung der vorliegenden Erfindung besteht insbesondere darin, eine Leitschaufel bereitzustellen, die für die Fixierung bzw. Lagerung an dem Innenringsegment weniger Bauraum benötigt. Zusätzlich oder alternativ kann eine Aufgabe einer Ausführung der vorliegenden Erfindung darin bestehen, ein Verfahren bereitzustellen, mittels dem die Leitschaufel auf einfache Weise mit dem Innenringsegment verbunden werden kann.It is an object of one embodiment of the present invention to provide an improved turbomachine having at least one vane assembly. An object of an embodiment of the present invention is in particular to provide a guide blade, which requires less space for the fixation or storage on the inner ring segment. Additionally or alternatively, an object of an embodiment of the present invention may be to provide a method by which the vane can be easily connected to the inner ring segment.

Erfindungsgemäß ist eine Leitschaufelanordnung mit einer oder mehreren Leitschaufeln vorgesehen. Wenigstens eine Leitschaufel weist einen radial inneren Zapfen auf, der in eine Bohrung einer Buchse eingreift, welche in einer Bohrung eines Innenringsegments angeordnet ist. Der Zapfen kann sich von einem radial inneren Ende eines Schaufelblatts der Leitschaufel nach radial innen erstrecken. Zwischen dem Zapfens und der Buchse ist eine drehfeste Verbindung vorgesehen, zwischen der Buchse und der Bohrung des Innenringsegments eine Gleitlagerung in Drehrichtung um die Bohrungs- bzw. Verstellachse. In einer Ausführung weist das Innenringsegment in Umfangsrichtung mehrere Bohrungen auf, wobei wenigstens in zwei, insbesondere in den beiden in Umfangsrichtung äußeren bzw. stirnseitigen, Bohrungen Buchsen gleitgelagert sind, in deren Bohrungen Zapfen von Leitschaufeln eingreifen, die mit dieser Buchse drehfest verbunden sind. Die Zapfen einer oder mehrerer, insbesondere aller, weiteren Leitschaufeln des Innenringsegments können in gleicher Weise drehfest mit Buchsen verbunden sein, die in Bohrungen des Innenringsegments gleitgelagert sind. In einer anderen Ausführung sind die Zapfen einer oder mehrerer, insbesondere aller, weiteren, insbesondere in Umfangsrichtung inneren, Leitschaufeln des Innenringsegments in ihren Buchsen drehbar bzw. gleitgelagert, die ihrerseits in Bohrungen des Innenringsegments gleitgelagert sein können.According to the invention, a vane arrangement with one or more vanes is provided. At least one vane has a radially inner pin which engages a bore of a bushing disposed in a bore of an inner ring segment. The spigot may extend radially inward from a radially inner end of a vane blade of the vane. Between the pin and the bush, a rotationally fixed connection is provided between the bushing and the bore of the inner ring segment a sliding bearing in the direction of rotation about the bore or adjustment axis. In one embodiment, the inner ring segment in the circumferential direction on a plurality of holes, at least in two, in particular in the two outer circumferential or frontal, bores bushings are slidably mounted, engage in the bores pins of vanes, which are rotatably connected to this socket. The pins of one or more, in particular all, further vanes of the inner ring segment may be rotatably connected in the same manner with bushings which are slidably mounted in bores of the inner ring segment. In another embodiment, the pins of one or more, in particular all, further, in particular in the circumferential direction inner vanes of the inner ring segment are rotatable or slidably mounted in their sockets, which in turn may be slidably mounted in bores of the inner ring segment.

Als drehfeste Verbindung zwischen einem Zapfen und einer Buchse wird insbesondere eine Verbindung verstanden, bei der sich der Zapfen und die Buchse relativ zueinander, wenigstens im Wesentlichen bzw. makroskopisch, nicht verdrehen können. Die Gleitlagerung zwischen einer Buchse und einer Bohrung des Innenringsegments kann in einer Ausführung durch eine Spielpassung ausgebildet sein.As a rotationally fixed connection between a pin and a socket, in particular a connection is understood, in which the pin and the sleeve relative to each other, at least substantially or macroscopically, can not rotate. The sliding bearing between a bushing and a bore of the inner ring segment may be formed in one embodiment by a clearance fit.

Eine derartige Leitschaufelanordnung kann den Vorteil aufweisen, dass durch die Verwendung der drehfesten Verbindung zwischen einem oder mehreren Zapfen und der jeweiligen Buchse und durch die Gleitlagerung zwischen dieser Buchse bzw. diesen Buchsen und der jeweiligen Bohrung des Innenringsegments der Zusammenbau der Leitschaufelanordnung, insbesondere der Einbau der Leitschaufel in das Innenringsegment, vereinfacht wird. Zusätzlich kann in einer Ausführung eine Fixierung der Leitschaufel in radialer Richtung erreicht werden. Zusätzlich oder alternativ kann die Leitschaufelanordnung, insbesondere die Leitschaufel von dem Innenringsegment, auf einfachere Weise demontiert werden. Der Platzbedarf für die zur Fixierung benötigten Komponenten ist in einer Ausführung gering, so dass vorteilhaft auch eine Mehrzahl von Leitschaufeln mit demselben Innenringsegment gekoppelt werden können.Such a vane arrangement may have the advantage that by the use of the rotationally fixed connection between one or more pin and the respective bushing and by the sliding bearing between this bushing or these bushes and the respective bore of the inner ring segment of the assembly of the vane assembly, in particular the installation of the guide vane in the inner ring segment is simplified. In addition, in one embodiment, a fixing of the guide vane in the radial direction can be achieved. Additionally or alternatively, the guide vane assembly, in particular the vane of the inner ring segment, can be dismantled in a simpler manner. The space required for the components required for fixing is low in one embodiment, so that advantageously also a plurality of guide vanes can be coupled to the same inner ring segment.

Ein weiterer Vorteil der zuvor genannten Leitschaufelanordnung kann darin bestehen, dass sich aufgrund der drehfesten Verbindung zwischen wenigstens einer Leitschaufel und ihrer Buchse bei einer Verstellung der Leitschaufel um deren Längsachse sowohl die Leitschaufel als auch die Buchse drehen. Eine Drehung der Buchse bietet den Vorteil, dass Verschleiß hauptsächlich an der Buchse und nicht wie aus dem Stand der Technik bekannten Ausführungen an dem Zapfen der Leitschaufel auftritt. Somit muss bei einer Wartung der Turbomaschine nur die Buchse und nicht mehr die komplette Leitschaufel ausgetauscht werden. Ferner vergrößert sich aufgrund der drehfesten Verbindung zwischen dem Zapfen der Leitschaufel und der Buchse vorteilhaft die Stützweite der Lagerung.Another advantage of the aforementioned vane arrangement may be that rotate due to the rotationally fixed connection between at least one vane and its socket in an adjustment of the vane about its longitudinal axis both the vane and the socket. Rotation of the bushing has the advantage that wear occurs primarily on the bushing and not on the journal of the blade, as is known in the art. Thus, when servicing the turbomachine, only the bushing and not the entire stator blade needs to be replaced. Furthermore, due to the rotationally fixed connection between the pin of the guide vane and the bush advantageously increases the span of the storage.

In einer bevorzugten Ausführung kann der Zapfen ein Außengewinde und die Buchse ein damit verschraubtes bzw. verschraubbares Innengewinde aufweisen. Alternativ oder zusätzlich kann zwischen dem Zapfen und der Buchse eine Gewindehülse angeordnet sein, die mit dem Zapfen und/oder der Buchse drehfest verbunden sein kann. Der Zapfen kann mit der Gewindehülse durch eine Schraubverbindung verbunden sein. Alternativ oder zusätzlich kann die Buchse mit der Gewindehülse durch eine Schraubverbindung verbunden sein. Alternativ oder zusätzlich kann der Zapfen ein Außengewinde aufweisen, welches mit einem Innengewinde einer Schraubenmutter verschraubbar bzw. verschraubt ist. Die Schraubenmutter kann sich, insbesondere in einem mit dem Zapfen verschraubten Zustand, gegen die Buchse abstützen. Ferner kann die Schraubenmutter an der von dem Schaufelblatt der Leitschaufel abgewandten Seite der Buchse angeordnet sein.In a preferred embodiment, the pin may have an external thread and the socket have a screwed or screwed internal thread. Alternatively or additionally, a threaded sleeve may be arranged between the pin and the bush, which may be rotatably connected to the pin and / or the socket. The pin can be connected to the threaded sleeve by a screw connection. Alternatively or additionally, the bush can be connected to the threaded sleeve by a screw connection. Alternatively or additionally, the pin may have an external thread which is screwed or screwed to an internal thread of a nut. The nut can be supported against the bush, in particular in a state bolted to the journal. Furthermore, the nut may be arranged on the side facing away from the blade of the vane side of the bushing.

Ein Vorteil der zuvor genannten Verbindungsmöglichkeiten kann darin bestehen, dass die Leitschaufel auf einfache Weise mit dem Innenringsegment, insbesondere der Buchse, drehfest verbunden werden kann.An advantage of the aforementioned connection possibilities may be that the guide vane can be connected in a simple manner to the inner ring segment, in particular the bushing, in a rotationally fixed manner.

Eine Schraubensicherung kann zum Sichern der Schraubverbindung vorgesehen sein. Die Schraubensicherung verhindert ein Lösen der Schraubverbindung zwischen der Leitschaufel und dem Innenringsegment. Somit wird durch die Schraubensicherung eine sichere Verbindung zwischen der Leitschaufel und dem Innenringsegment gewährleistet. Die Schraubensicherung kann in einer Ausführung eine Splintsicherung und/oder eine Stiftsicherung und/oder eine Sprengringsicherung und/oder einen Sicherungsdraht aufweisen.A screw lock can be provided to secure the screw. The screw lock prevents loosening of the screw connection between the guide vane and the inner ring segment. Thus, a secure connection between the vane and the inner ring segment is ensured by the screw lock. In one embodiment, the screw lock can have a splint lock and / or a pin lock and / or a snap ring lock and / or a safety wire.

Das Innenringsegment kann mit einem Dichtungsträgersegment lösbar, insbesondere durch eine Formschlussverbindung, verbunden sein. Ferner kann das Innenringsegment mit wenigstens einer Leitschaufel gekoppelt sein. Das Dichtungsträgersegment kann ein Dichtungsmittel aufweisen, das sich vom Dichtungsträgersegment in eine von dem Innenringsegment abgewandte Richtung erstreckt. Das Dichtungsträgersegment, insbesondere das Dichtungsmittel, dient zum Abdichten eines Spalts zwischen der Leitschaufel, insbesondere dem Innenträgersegment, und einem Rotor der Turbomaschine.The inner ring segment can be releasably connected to a seal carrier segment, in particular by a positive connection. Furthermore, the inner ring segment may be coupled to at least one vane. The seal carrier segment may include a sealant extending from the seal carrier segment in a direction away from the inner ring segment. The seal carrier segment, in particular the sealing means, serves to seal a gap between the guide vane, in particular the inner carrier segment, and a rotor of the turbomachine.

Gemäß einem anderen Aspekt der Erfindung ist eine Leitschaufel vorgesehen, die einen Zapfen mit einem Außengewinde aufweist. Der Zapfen kann von dem radial inneren Ende des Schaufelblatts vorstehen. Insbesondere kann der Zapfen in die Bohrung der Buchse, die in der Bohrung des Innenringsegments angeordnet ist, eingerührt werden.According to another aspect of the invention, a vane is provided which has a pin with an external thread. The pin may protrude from the radially inner end of the airfoil. In particular, the pin can be stirred into the bore of the bush, which is arranged in the bore of the inner ring segment.

Die zuvor beschriebene Leitschaufelanordnung oder Leitschaufel kann in einer Gasturbine, insbesondere einem Flugtriebwerk, mit wenigstens einer Verdichter- und/oder Turbinenstufe verwendet werden. Der Einsatz der Leitschaufelanordnung oder Leitschaufel ist jedoch nicht auf die Gasturbine und das Flugtriebwerk beschränkt, sondern kann auch in anderen Turbomaschinen eingesetzt werden.The vane assembly or vane described above may be used in a gas turbine, particularly an aircraft engine, having at least one compressor and / or turbine stage. However, the use of the vane assembly or vane is not limited to the gas turbine and aircraft engine, but may be used in other turbomachinery.

Das Montieren wenigstens einer Leitschaufel in ein Innenringsegment kann wie folgt durchgeführt werden: Der Zapfen der Leitschaufel wird in die Bohrung der Buchse eingeführt, die in einer Ausführung bereits in der Bohrung des Innenringsegments angeordnet ist. In einer anderen Ausführung wird zunächst der Zapfen der Leitschaufel in die Bohrung der Buchse eingeführt, die anschließend in der Bohrung des Innenringsegments angeordnet wind. Gleichermaßen kann das Einführen des Zapfens in die Buchse und der Buchse in das Innenringsegment auch, wenigstens im Wesentlichen, zusammen durchgeführt werden.The mounting of at least one vane into an inner ring segment can be carried out as follows: The vane of the vane is inserted into the bore of the bush, which in one embodiment is already located in the bore of the inner ring segment. In another embodiment, first, the pin of the vane in the bore introduced the sleeve, which is then arranged in the bore of the inner ring segment wind. Similarly, the insertion of the pin into the bushing and the bushing in the inner ring segment can also be performed together, at least substantially.

Der Zapfen wird mit der Buchse drehfestgelegt. Die Drehfestlegung kann insbesondere durch eine Schraubverbindung bzw. ein Verschrauben erfolgen. Die Buchse wird mit dem Innenringsegment gleitgelagert. Die Gleitlagerung der Buchse mit dem Innenringsegment kann, wie vorstehend ausgeführt, vor oder gleichzeitig oder nach dem Drehfestlegen des Zapfens mit der Buchse erfolgen. Infolge der Gleitlagerung ist eine Relativbewegung, insbesondere Relativdrehung, zwischen der Buchse und dem Innenringsegment möglich. Eine Demontage kann in einer Ausführung in umgekehrter Reihenfolge erfolgen.The pin is fixed in rotation with the socket. The rotation can be done in particular by a screw or screwing. The bush is slidably mounted with the inner ring segment. The sliding bearing of the sleeve with the inner ring segment, as stated above, before or at the same time or after the rotation of the pin with the bushing. As a result of the sliding bearing a relative movement, in particular relative rotation, between the sleeve and the inner ring segment is possible. Dismantling can be done in an embodiment in reverse order.

Durch das zuvor beschriebene Verfahren ist eine Montage und/oder Demontage der Leitschaufel auf einfache und schnelle Weise möglich.By the method described above, an assembly and / or disassembly of the vane in a simple and fast way possible.

Weitere Merkmale und Vorteile ergeben sich aus den Unteransprüchen und dem Ausführungsbeispiel. Hierzu zeigen:

Fig. 1:
eine perspektivische Ansicht eines Ausschnitts der Verbindung einer Leitschaufel mit einem Innenringsegment einer Turbomaschine gemäß einer Ausführung der vorliegenden Erfindung,
Fig. 2:
eine Seitenschnittansicht einer Mehrzahl von in Umfangsrichtung benachbarten Leitschaufeln der Turbomaschine der Fig. 1,
Fig. 3
eine Seitenschnittansicht der Verbindung der Leitschaufel mit dem Innenringsegment der Turbomaschine der Fig. 1 mit einer Schraubensicherung gemäß einer Ausführung der vorliegenden Erfindung,
Fig. 4:
eine Seitenschnittansicht der Verbindung der Leitschaufel mit dem Innenringsegment der Turbomaschine der Fig. 1 mit einer Schraubensicherung gemäß einer weiteren Ausführung der vorliegenden Erfindung, und
Fig. 5:
eine Seitenschnittansicht der Verbindung der Leitschaufel mit dem Innenringsegment der Turbomaschine der Fig. 1 mit einer Schraubensicherung gemäß einer weiteren Ausführung der vorliegenden Erfindung.
Further features and advantages emerge from the subclaims and the exemplary embodiment. Show:
Fig. 1:
3 is a perspective view of a section of the connection of a guide vane to an inner ring segment of a turbomachine according to an embodiment of the present invention,
Fig. 2:
a side sectional view of a plurality of circumferentially adjacent vanes of the turbomachine of Fig. 1 .
Fig. 3
a side sectional view of the connection of the vane with the inner ring segment of the turbomachine of Fig. 1 with a screw lock according to an embodiment of the present invention,
4:
a side sectional view of the connection of the vane with the inner ring segment of the turbomachine of Fig. 1 with a screw lock according to another embodiment of the present invention, and
Fig. 5:
a side sectional view of the connection of the vane with the inner ring segment of the turbomachine of Fig. 1 with a screw lock according to another embodiment of the present invention.

Eine im Übrigen nicht dargestellte Turbomaschine weist mehrere in axialer Richtung der Turbomaschine versetzt zueinander angeordnete Laufräder und Leiträder auf. Die Leiträder sind entlang der axialen Richtung der Turbomaschine jeweils zwischen zwei Laufrädern angeordnet und weisen in Umfangsrichtung eine Mehrzahl von Leitschaufeln 110 auf.An otherwise not shown turbomachine has a plurality of offset in the axial direction of the turbomachine to each other arranged impellers and guide wheels. The guide wheels are each arranged between two wheels along the axial direction of the turbomachine and have a plurality of guide vanes 110 in the circumferential direction.

Bei den in Figur 1, 2 dargestellten Leitschaufeln 110 handelt es sich um solche, die um ihre Längsachse verstellbar sind. Die Leitschaufeln 110 sind an ihrem radial inneren Ende mit einem Innenringsegment 2 verbunden. An dem radial inneren Ende des Innenringsegments 2 steht ein Flansch 30 der Buchse 3 in radialer Richtung von dem Innenringsegment 2 vor. Das dargestellte Innenringsegment 2 ist Bestandteil eines Innenrings, der sich aus einer Mehrzahl von in Umfangsrichtung benachbarten Innenringsegmenten 2 zusammensetzt.At the in FIG. 1, 2 illustrated guide vanes 110 are those which are adjustable about its longitudinal axis. The vanes 110 are connected at their radially inner end with an inner ring segment 2. At the radially inner end of the inner ring segment 2, a flange 30 of the bushing 3 protrudes in the radial direction from the inner ring segment 2. The illustrated inner ring segment 2 is part of an inner ring, which is composed of a plurality of circumferentially adjacent inner ring segments 2.

Fig. 2 zeigt eine Seitenschnittansicht einer Mehrzahl von in Umfangsrichtung benachbarter Leitschaufeln 110. Dabei weist jede Leitschaufel 110 ein Schaufelblatt auf, das an dem radial inneren Ende einen Zapfen 111 besitzt. Der Zapfen 111 steht von dem Schaufelblatt in radialer Richtung vor und greift in eine Bohrung einer Buchse 3 ein. Die Buchsen 3 sind in Bohrungen des Innenringsegments 2 angeordnet. Fig. 2 11 shows a side sectional view of a plurality of circumferentially adjacent vanes 110. Each vane 110 includes an airfoil having a peg 111 at the radially inner end. The pin 111 protrudes from the blade in the radial direction and engages in a bore of a bushing 3 a. The bushes 3 are arranged in bores of the inner ring segment 2.

Die Zapfen 111 der in Umfangsrichtung äußeren Leitschaufeln (links, rechts in Fig. 2) weisen jeweils ein Außengewinde auf, das mit einem Innengewinde der jeweiligen Buchse 3 in Eingriff steht. Die Buchsen 3 sind in Bohrungen des Innenringsegments 2 gleitgelagert. Dies bedeutet, dass sich die Buchsen 3 relativ zu dem Innenringsegment 2 drehen können. Gleichzeitig ist sichergestellt, dass keine Relativbewegung zwischen den in Umfangsrichtung äußeren Buchsen 3 und den in Umfangsrichtung äußeren Leitschaufeln 110, insbesondere deren Zapfen 111, möglich ist.The pins 111 of the circumferentially outer vanes (left, right in Fig. 2 ) each have an external thread, which is in engagement with an internal thread of the respective bushing 3. The bushes 3 are slidably mounted in bores of the inner ring segment 2. This means that the bushes 3 can rotate relative to the inner ring segment 2. At the same time it is ensured that no relative movement between the circumferentially outer bushes 3 and the outer circumferential guide vanes 110, in particular their pin 111, is possible.

Die Zapfen 111 der übrigen bzw. in Umfangsrichtung inneren Leitschaufeln (zweite bis siebte Leitschaufel in Fig. 2) weisen kein Außengewinde auf, sondern sind in den Bohrungen der jeweiligen Buchse 3 gleitgelagert. Diese Buchsen 3 sind ihrerseits in Bohrungen des Innenringsegments 2 gleitgelagert oder drehfestgelegt. Gleichermaßen können auch diese Zapfen 111 in den Bohrungen der jeweiligen Buchse 3 drehfestgelegt sein, die ihrerseits in Bohrungen des Innenringsegments 2 gleitgelagert sind.The pins 111 of the other or circumferentially inner vanes (second to seventh vane in Fig. 2 ) have no external thread, but are slidably mounted in the bores of the respective sleeve 3. These bushes 3 are in turn slidably mounted in holes of the inner ring segment 2 or rotationally fixed. Likewise, these pins 111 may be rotationally fixed in the bores of the respective bushing 3, which in turn are slidably mounted in bores of the inner ring segment 2.

Das Innenringsegment 2 ist mit einem Dichtungsträgersegment 4 verbunden. Das Dichtungsträgersegment 4 ist Bestandteil eines Dichtungsträgers, der eine Mehrzahl von in Umfangsrichtung benachbarten Dichtungsträgersegmenten 4 aufweist.The inner ring segment 2 is connected to a seal carrier segment 4. The seal carrier segment 4 is part of a seal carrier, which has a plurality of circumferentially adjacent seal carrier segments 4.

Ferner können (alternativ dazu oder in Kombination) nur die beiden äußeren Zapfen 111 eines Innenringsegmentes mit den Buchsen 3 verschraubt sein. Die Verschraubung kann per Splint 33 gegen eine Aufdrehen gesichert sein.Furthermore, (alternatively or in combination), only the two outer pins 111 of an inner ring segment can be screwed to the bushings 3. The screw can be secured by splint 33 against untwisting.

In Figur 3 ist eine vergrößerte Darstellung einer Verbindung einer in Umfangsrichtung äußeren Leitschaufel 110 mit dem Innenringsegment 2 dargestellt. Das Dichtungsträgersegment 4 weist einen Boden auf, von dem sich ein Dichtungsmittel 40 in eine von dem Innenringsegment 2 entfernte Richtung erstreckt. Ferner erstrecken sich von dem Dichtungsträgersegment 4 zwei Flanken, die an ihrem jeweiligen von dem Boden des Dichtungsträgersegments 4 entfernten Ende über eine Formschlussverbindung mit dem Innenringsegment 2 lösbar verbunden sind.In FIG. 3 an enlarged view of a compound of a circumferentially outer stator blade 110 with the inner ring segment 2 is shown. The seal carrier segment 4 has a bottom, from which a sealing means 40 extends in a direction remote from the inner ring segment 2 direction. Further, extending from the seal carrier segment 4, two flanks, which are detachably connected at their respective end remote from the bottom of the seal carrier segment 4 via a positive connection with the inner ring segment 2.

Der Flansch 30 der Buchse 3 ragt aus dem Innenringsegment 2 vor und steht quer zu einer Längsachse der Buchse 3. An dem von dem Flansch 30 entfernten Ende der Buchse ist ein Gleitring 5 vorgesehen, der zwischen der Buchse 3 und dem Schaufelblatt der Leitschaufel 110 angeordnet ist.The flange 30 of the bushing 3 protrudes from the inner ring segment 2 and projects transversely to a longitudinal axis of the bushing 3. At the end of the bushing remote from the flange 30, a sliding ring 5 is provided, which is arranged between the bushing 3 and the blade of the guide blade 110 is.

Eine Schraubensicherung ist vorgesehen, um ein Aufdrehen der Schraubverbindung zwischen dem Zapfen 111 und der Buchse 3 zu verhindern. Somit dient die Schraubensicherung zum Verhindern einer Relativbewegung zwischen dem Zapfen 111 und der Buchse 3. Die in Figur 3 dargestellte Schraubensicherung gemäß einer ersten Ausführung entspricht einer Splintsicherung. Zur Realisierung der Splintsicherung ist in der Buchse 3, dem Zapfen 111 und einem Teil des Innenringsegments 2 eine Aussparung vorgesehen, in bzw. durch die ein Splint 33 eingeführt werden kann, um die zuvor genannte Sicherung zu realisieren.A screw lock is provided to prevent unscrewing the screw connection between the pin 111 and the socket 3. Thus, the screw lock serves to prevent relative movement between the pin 111 and the socket 3. The in FIG. 3 illustrated screw lock according to a first embodiment corresponds to a splint lock. To realize the splint lock, a recess is provided in the bushing 3, the pin 111 and a part of the inner ring segment 2, into or through which a split pin 33 can be inserted in order to realize the aforementioned securing.

In Figur 4 wird eine Schraubensicherung gemäß einer zweiten Ausführung dargestellt. Die Schraubensicherung weist einen Sicherungsstift 7 auf, der in einen Zwischenraum zwischen dem Zapfen 111 und der Buchse 3 eingefügt wird.In FIG. 4 a screw lock according to a second embodiment is shown. The screw lock has a locking pin 7, which is inserted into a gap between the pin 111 and the socket 3.

In Figur 5 wird eine Schraubensicherung gemäß einer dritten Ausführung dargestellt. In dieser weist die Schraubensicherung einen Sicherungsdraht 8 auf. Der Sicherungsdraht 8 ist in Aufnahmen in der Buchse 3 angeordnet und mit dem Zapfen 111 gekoppelt.In FIG. 5 a screw lock according to a third embodiment is shown. In this, the screw lock on a fuse wire 8. The fuse wire 8 is arranged in receptacles in the socket 3 and coupled to the pin 111.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Turbomaschineturbomachinery
22
InnenringsegmentInner ring segment
33
BuchseRifle
44
DichtungsträgersegmentSeal carrier segment
55
Gleitringsliding ring
77
Sicherungsstiftsafety pin
88th
Sicherungsdrahtfuse wire
1010
Laufräderimpellers
1111
LeiträderIdlers
110110
Leitschaufelnvanes
111111
Zapfenspigot
3030
Flanschflange
3333
Splintcotter
4040
Dichtungsmittelsealant

Claims (11)

  1. A guide vane assembly having at least one guide vane (110) with a radial inner journal (111), which engages in a borehole of a bushing (3), which is disposed in a borehole of an inner ring segment (2), with a rotation-resistant connection being present between the journal (111) and the bushing (3) and a slide mounting being present between the bushing (3) and the borehole of the inner ring segment (2), characterized in that the journal (111) has an outer thread and the bushing (3) has an inner thread screwed thereto.
  2. The guide vane assembly as set forth in the preceding claim, characterized in that a threaded sleeve is disposed between the journal (111) and the bushing (3), and that the journal (111) and the bushing (3) are connected to the threaded sleeve.
  3. The guide vane assembly as set forth in any one of the preceding claims, characterized in that the journal (111) has an outer thread that is screwed with an inner thread of a nut.
  4. The guide vane assembly as set forth in any one of the preceding claims, characterized by a screw locking device for securing the screw connection between the inner thread of the bushing and an outer thread screwed thereto and/or the screw connection between an outer thread of the journal and an inner thread screwed thereto.
  5. The guide vane assembly as set forth in the preceding claim, characterized in that the screw locking device has a split-pin locking device (33) and/or locking pin (7) and/or snap-ring locking device and/or a locking wire (8).
  6. The guide vane assembly as set forth in the preceding claim, characterized in that the inner ring segment (2) is detachably connected to a seal support segment (4).
  7. The guide vane assembly as set forth in any one of the preceding claims, characterized by at least one additional guide vane (110) that is distanced in the peripheral direction, particularly on the outside in the peripheral direction, and has an additional radially inner journal (111) that engages in an additional borehole of a bushing (3), which is disposed in an additional borehole of an inner ring segment (2), with the additional journal (111) and the additional bushing (3) being connected in a rotation-resistant manner, and with the additional bushing (3) being slide-mounted in the additional borehole of the inner ring segment (2).
  8. The guide vane assembly as set forth in any one of the preceding claims, characterized by at least one additional, adjacent guide vane (110), particularly on the inside in the peripheral direction, having an additional radially inner journal (111) that engages in an additional borehole of a bushing (3), which is disposed in an additional borehole of an inner ring segment (2), with the additional journal (111) being slide-mounted in the additional bushing (3) and/or with the additional bushing (3) being slide-mounted in the additional borehole of the inner ring segment (2).
  9. A guide vane (110) with a journal (111) having an outer thread for a guide vane assembly as set forth in any one of preceding claims 1 to 6.
  10. A gas turbine, particularly aircraft engine, having at least one compressor and/or turbine stage with a guide vane assembly as set forth in any one of preceding claims 1 to 8 and/or a guide vane (110) as set forth in claim 9.
  11. A method for fastening a guide vane (110) as set forth in claim 9 to an inner ring segment (2), characterized by the following steps:
    - introduction of a journal (111) of the guide vane (110) into a borehole of a bushing (3),
    - previous, simultaneous, or subsequent disposal of the bushing in a borehole of the inner ring segment (2), and
    - precious, simultaneous, or subsequent rotational fixation of the journal (111) to the bushing (3).
EP14172250.4A 2013-06-20 2014-06-13 Guide vane assembly, guide vane and method for mounting a guide vane Not-in-force EP2816198B1 (en)

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EP3128132B1 (en) * 2015-08-03 2019-03-27 MTU Aero Engines GmbH Turbo engine guide blade ring element
FR3120387B1 (en) * 2021-03-08 2023-12-15 Safran Aircraft Engines Vibration damping ring for variable-pitch rectifier vane pivot of a turbomachine, bearing and rectifier vane comprising such a ring

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US3079128A (en) * 1961-01-23 1963-02-26 Burge Joseph Sealing and securing means for turbomachine blading
FR2556410B1 (en) * 1983-12-07 1986-09-12 Snecma DEVICE FOR CENTERING THE INSIDE RING OF A VARIABLE TIMING FINS STATOR
FR2582720B1 (en) * 1985-05-29 1989-06-02 Snecma PROCESS FOR PRODUCING A TURBOMACHINE BLADE PIVOT AND A STATOR BLADE COMPRISING SAME
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FR2699595B1 (en) * 1992-12-23 1995-01-20 Snecma Device for guiding in rotation a control ring for pivoting vanes.
FR2742800B1 (en) * 1995-12-20 1998-01-16 Snecma ARRANGEMENT OF INTERNAL ENDS OF A VARIABLE SETTING BLADE STAGE
FR2775731B1 (en) * 1998-03-05 2000-04-07 Snecma CIRCULAR STAGE OF BLADES AT INTERIOR ENDS JOINED BY A CONNECTING RING
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