EP1777375B1 - Bearing device of a variable guide vane in an axial turbomachine - Google Patents
Bearing device of a variable guide vane in an axial turbomachine Download PDFInfo
- Publication number
- EP1777375B1 EP1777375B1 EP06076731.6A EP06076731A EP1777375B1 EP 1777375 B1 EP1777375 B1 EP 1777375B1 EP 06076731 A EP06076731 A EP 06076731A EP 1777375 B1 EP1777375 B1 EP 1777375B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pivot
- blade
- housing
- bearing
- casing
- 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.)
- Active
Links
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims 2
- 239000007789 gas Substances 0.000 description 6
- 230000000717 retained effect Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
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
- 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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/56—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/563—Fluid-guiding means, e.g. diffusers adjustable specially adapted for elastic fluid pumps
-
- 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
- F05D2240/00—Components
- F05D2240/50—Bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/20—Three-dimensional
- F05D2250/23—Three-dimensional prismatic
- F05D2250/231—Three-dimensional prismatic cylindrical
Definitions
- the present invention relates to the field of turbomachines such as an axial compressor of a gas turbine engine, and aims in particular the variable-pitch stator vanes.
- An articulated system such as the variable pitch stator vanes of a gas turbine engine compressor, includes moving parts relative to one another.
- a blade 1 of variable-pitch rectifier mounted in the housing 3 of the machine.
- the blade comprises a blade 12, a plate or platform 13 and a pivot rod 14.
- the pivot 14 is housed in a bore or radial orifice formed in the wall of the casing 3 via different bearings.
- One of the bearings, the low bearing is constituted by a sleeve 4 in sliding contact with the lower part of the pivot rod 14, directly or via a hoop 14 '.
- the bushing 4 is integral with the housing and comprises a portion 4 'housed in the bottom of a countersink machined in the wall of this housing.
- variable-pitch stator vanes Increasing the operating forces of variable-pitch stator vanes.
- variable-pitch stator as defined in claim 1.
- the distance between the point of application of the aerodynamic force and the bearing of the pivot guide device located at the bottom of the pivot is reduced. This decrease in height reduces the moment applied at dawn. It follows that the reaction force at the pivot to oppose the moment is lower. Thus the matting efforts at the contacts between the pivot of the blade and the bushing are lower, resulting in reduced wear.
- the device optionally comprises a high bearing between the upper part of the pivot and its housing in the housing.
- the guiding device comprises a low bearing between the lower part of the pivot and its housing in the housing. It further reduces the load on the bushings by distributing them.
- a variable-pitch stator vane 20 is seen to be cantilevered with a blade 22, a platform 23 and a pivot 24.
- the pivot 24 is housed in a radial bore of the casing 3 which is, for example, that of the compressor. a gas turbine engine.
- the blade is retained by a nut 28 in its upper part and connected to a lever 27 for stall control as is known.
- the terms high and low designate the position relative to the axis of the motor, a high element being away from the axis relative to a low element.
- the guide device of the blade is constituted by a cylindrical sleeve 25 between the pivot 24 and the housing in the housing 3. This sleeve also provides sealing.
- a socket 26 in the lower part of the pivot comprises a part cylindrical 26a between the lower part of the pivot and the housing in the housing.
- the sleeve is extended by a generally disk-shaped portion 26b, between the platform 23 and the bottom of the housing counterbore constituting the housing thereof.
- a bearing is formed at the platform.
- the bearing is formed by the cooperation of a rib 26b1 and a groove 23b1.
- the circular rib is formed on the face of the sleeve facing the platform 23.
- the circular term also includes the embodiment wherein the rib extends over one or more arcs of circles.
- This rib is according to this example square section and is adjusted in the groove 23b1 of complementary shape, hollowed in the face of the platform facing the sleeve 26.
- the two parts, rib and groove form an integrated bearing 23b1-26b1 which takes again the aerodynamic forces applied on the blade and transmits them to the casing 3.
- the radius of the integrated bearing is chosen so that the friction between the rib 26bl of the sleeve 26 and the groove 23bl of the platform induce a resistance to the axial pivoting of the blade which is acceptable and does not disturb the operation of the control means of the setting.
- the sleeve 26 remains stationary relative to the housing.
- the forces in the presence are the aerodynamic force F, the reaction force F1 of the casing on the lower part of the guiding device and the force F2 of the reaction of the casing on the upper part of the guiding device.
- L, 50mm is the distance between the point of application of F and the low bearing
- L1, 40 mm is the distance between the low bearing and the high bearing.
- F1 and F2 are respectively 225 daN and 125 daN.
- Prior art Invention Gain F 100 100 F1 (daN) 225 187.5 17% F2 (daN) 125 87.5 30% L (mm) 50 42 L1 (mm) 40 48 Moment 5000 4200
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
La présente invention se rapporte au domaine des turbomachines telles qu'un compresseur axial d'un moteur à turbine à gaz, et vise en particulier les aubes de stator à calage variable.The present invention relates to the field of turbomachines such as an axial compressor of a gas turbine engine, and aims in particular the variable-pitch stator vanes.
Un système articulé, comme les aubes de redresseur à calage variable d'un compresseur de moteur à turbine à gaz, comprend des pièces en mouvement relatif les unes par rapport aux autres. Sur les
Un exemple de réalisation d'un tel système avec incorporation de douilles entre l'aube et le carter est décrit dans la demande de brevet
Dans le cas d'un compresseur de moteur à turbine à gaz, la pale 12 est soumise aux efforts aérodynamiques selon la flèche A. Dans le cas d'un tel montage en porte à faux, il s'ensuit que l'application d'un moment sur les deux paliers bas et haut, associée à la rotation de calage autour de l'axe XX sur une amplitude de plus de 40 degrés, entraîne une usure des douilles. Cette usure provoque une inclinaison de l'aubage qui peut être dommageable pour le compresseur.In the case of a gas turbine engine compressor, the
Le présent déposant s'est fixé comme objectif d'assurer le guidage des aubes de stator à calage variable de type à montage en porte à faux en prévenant ces inconvénients, à savoir :
- L'usure des douilles du dispositif de guidage créant une inclinaison excessive des aubes sous l'effort aérodynamique.
- The wear of the guiding bushings creating an excessive inclination of the vanes under the aerodynamic force.
L'augmentation des efforts de manoeuvre des aubes de stator à calage variable.Increasing the operating forces of variable-pitch stator vanes.
L'invention parvient à ces objectifs avec un stator à calage variable comme défini dans la revendication 1.The invention achieves these objectives with a variable-pitch stator as defined in claim 1.
Par le moyen de l'invention, on réduit la distance entre le point d'application de l'effort aérodynamique et le palier du dispositif de guidage du pivot situé au bas du pivot. Cette diminution de hauteur réduit le moment appliqué à l'aube. Il s'ensuit que l'effort de réaction au niveau du pivot pour s'opposer au moment est plus faible. Ainsi les efforts de matage aux contacts entre le pivot de l'aube et la douille sont plus faibles d'où une usure réduite.By means of the invention, the distance between the point of application of the aerodynamic force and the bearing of the pivot guide device located at the bottom of the pivot is reduced. This decrease in height reduces the moment applied at dawn. It follows that the reaction force at the pivot to oppose the moment is lower. Thus the matting efforts at the contacts between the pivot of the blade and the bushing are lower, resulting in reduced wear.
Le dispositif comprend éventuellement un palier haut entre la partie haute du pivot et son logement dans le carter.The device optionally comprises a high bearing between the upper part of the pivot and its housing in the housing.
Conformément à un mode de réalisation avantageux, le dispositif de guidage comprend un palier bas entre la partie basse du pivot et son logement dans le carter. Il permet de réduire encore les charges sur les douilles en les répartissant.According to an advantageous embodiment, the guiding device comprises a low bearing between the lower part of the pivot and its housing in the housing. It further reduces the load on the bushings by distributing them.
D'autres caractéristiques et avantages, apparaîtront à la lecture de deux modes de réalisation non limitatifs de l'invention en référence aux dessins annexés sur lesquels :
- La
figure 1 représente une aube de stator à calage variable, de l'art antérieur, montée dans un carter de compresseur; - La
figure 2 représente une aube de stator à calage variable avec un dispositif de guidage selon un premier mode de réalisation; - La
figure 3 montre une aube de stator à calage variable avec un dispositif de guidage selon un deuxième mode de réalisation.
- The
figure 1 represents a variable-pitch stator blade of the prior art, mounted in a compressor housing; - The
figure 2 represents a variable-pitch stator vane with a guiding device according to a first embodiment; - The
figure 3 shows a variable-pitch stator vane with a guiding device according to a second embodiment.
En se reportant à la
On note que dans cette réalisation, il n'y a pas de contact glissant entre la partie basse du pivot 24 et la douille 26a. La partie haute du pivot forme un palier haut 29Note that in this embodiment, there is no sliding contact between the lower part of the
On note également que le rayon du palier intégré est choisi de manière à ce que les frottements entre la nervure 26bl de la douille 26 et la rainure 23bl de la plateforme induisent une résistance au pivotement axial de l'aube qui soit acceptable et ne perturbe pas le fonctionnement des moyens de commande du calage. Pendant la rotation de l'aube autour de son axe, la douille 26 reste immobile par rapport au carter.It is also noted that the radius of the integrated bearing is chosen so that the friction between the rib 26bl of the sleeve 26 and the groove 23bl of the platform induce a resistance to the axial pivoting of the blade which is acceptable and does not disturb the operation of the control means of the setting. During the rotation of the blade around its axis, the sleeve 26 remains stationary relative to the housing.
A titre d'exemple on a chiffré l'avantage de cette disposition : les forces en présence sont la force F aérodynamique, la force F1 de réaction du carter sur la partie basse du dispositif de guidage et la force F2 de réaction du carter sur la partie haute du dispositif de guidage.By way of example, the advantage of this arrangement has been quantified: the forces in the presence are the aerodynamic force F, the reaction force F1 of the casing on the lower part of the guiding device and the force F2 of the reaction of the casing on the upper part of the guiding device.
L, 50mm, est la distance entre le point d'application de F et le palier bas, L1, 40 mm, est la distance entre le palier bas et le palier haut. Pour une valeur F de 100 daN, les valeurs de F1 et F2 sont alors respectivement de 225 daN et 125 daN.L, 50mm, is the distance between the point of application of F and the low bearing, L1, 40 mm, is the distance between the low bearing and the high bearing. For a value F of 100 daN, the values of F1 and F2 are respectively 225 daN and 125 daN.
On voit sur le tableau ci dessous qu'en rapprochant le palier bas de 8 mm de la pale, le gain en réduction d'effort est de 17% et 30% respectivement.
On a représenté sur la
Claims (6)
- Turbomachine stator comprising at least one blade and at least one casing (3), the blade comprising a vane (22), a platform (23) and a pivot (24) by which the blade is mounted in the casing (3) of the turbomachine, and comprising a bush (26) with a discoid portion (26b) between the casing and the platform (23), characterised in that it comprises a circular rib (26b1) that is formed on said discoid portion and interacts with a matching groove (23b1) formed on the platform, so as to form an integral axial and radial bearing.
- Stator according to claim 1, characterised in that it further comprises a top bearing between the top portion of the pivot (24) and its housing in the casing (3).
- Stator according to either claim 1 or claim 2, comprising a supplementary bottom bearing (31) between the bottom portion of the pivot (24) and its housing in the casing (3).
- Stator according to claim 1, of which the bush (26) comprises a cylindrical portion (26a) between the pivot (24) and the casing (3).
- Turbomachine compressor having a stator according to any of the preceding claims.
- Turbomachine having a stator according to any of claims 1 to 4.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0553159A FR2892147B1 (en) | 2005-10-18 | 2005-10-18 | VARIABLE-TIMING STATOR VANE GUIDING DEVICE IN AXIAL TURBOMACHINE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1777375A1 EP1777375A1 (en) | 2007-04-25 |
EP1777375B1 true EP1777375B1 (en) | 2014-07-16 |
Family
ID=36658578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06076731.6A Active EP1777375B1 (en) | 2005-10-18 | 2006-09-18 | Bearing device of a variable guide vane in an axial turbomachine |
Country Status (3)
Country | Link |
---|---|
US (1) | US7661925B2 (en) |
EP (1) | EP1777375B1 (en) |
FR (1) | FR2892147B1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2913052B1 (en) * | 2007-02-22 | 2011-04-01 | Snecma | CONTROL OF AUBES WITH VARIABLE SETTING ANGLE |
US8858165B2 (en) * | 2010-09-30 | 2014-10-14 | Rolls-Royce Corporation | Seal arrangement for variable vane |
US10570762B2 (en) * | 2015-05-15 | 2020-02-25 | United Technologies Corporation | Vane strut positioning and securing systems including locking washers |
FR3039226B1 (en) | 2015-07-20 | 2017-07-14 | Snecma | VARIABLE SHAFT OF AUBES FOR A TURBOMACHINE |
DE102017222209A1 (en) | 2017-12-07 | 2019-06-13 | MTU Aero Engines AG | Guide vane connection and turbomachine |
CN114278435B (en) * | 2020-09-28 | 2023-05-16 | 中国航发商用航空发动机有限责任公司 | Compressor, gas turbine engine, adjustable vane assembly, and method of assembly |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1685260A (en) * | 1926-06-17 | 1928-09-25 | William M White | Guide vane |
CH215738A (en) * | 1940-03-26 | 1941-07-15 | Escher Wyss Maschf Ag | Centrifugal pump with adjustable guide vanes. |
US3558237A (en) * | 1969-06-25 | 1971-01-26 | Gen Motors Corp | Variable turbine nozzles |
DE2113194A1 (en) * | 1971-03-18 | 1972-09-28 | Daimler Benz Ag | Storage of adjustable blades |
AT321224B (en) * | 1971-10-06 | 1975-03-25 | Andritz Ag Maschf | Adjustable guide vanes for turbines |
US3788763A (en) * | 1972-11-01 | 1974-01-29 | Gen Motors Corp | Variable vanes |
US4498790A (en) * | 1983-11-21 | 1985-02-12 | United Technologies Corporation | Bushing securing apparatus |
US4856962A (en) * | 1988-02-24 | 1989-08-15 | United Technologies Corporation | Variable inlet guide vane |
JPH03149415A (en) * | 1989-10-12 | 1991-06-26 | Uingu Haisera:Kk | Ceramic bearing |
DE4032803A1 (en) * | 1990-10-16 | 1992-04-30 | D O R N E Y Technologie Gmbh | Molded part made of a metalic and a ceramic body |
US5622473A (en) * | 1995-11-17 | 1997-04-22 | General Electric Company | Variable stator vane assembly |
US6767183B2 (en) * | 2002-09-18 | 2004-07-27 | General Electric Company | Methods and apparatus for sealing gas turbine engine variable vane assemblies |
FR2868490B1 (en) * | 2004-04-05 | 2006-07-28 | Snecma Moteurs Sa | CERAMIC SOCKET FOR A VARIABLE TURBOMACHINE AUBING TIMING SYSTEM |
FR2885182B1 (en) * | 2005-04-28 | 2010-11-26 | Snecma Moteurs | VARIABLE-TIMING STATOR VANE, PROCESS FOR REPAIRING A DAWN |
-
2005
- 2005-10-18 FR FR0553159A patent/FR2892147B1/en active Active
-
2006
- 2006-09-18 EP EP06076731.6A patent/EP1777375B1/en active Active
- 2006-10-13 US US11/549,270 patent/US7661925B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US7661925B2 (en) | 2010-02-16 |
US20080025837A1 (en) | 2008-01-31 |
EP1777375A1 (en) | 2007-04-25 |
FR2892147B1 (en) | 2010-09-17 |
FR2892147A1 (en) | 2007-04-20 |
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