EP1564381B1 - Stellhebel an der Schwenkachse einer verstellbaren Leitschaufel in einer Strömungsmaschine. - Google Patents

Stellhebel an der Schwenkachse einer verstellbaren Leitschaufel in einer Strömungsmaschine. Download PDF

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Publication number
EP1564381B1
EP1564381B1 EP05290139.4A EP05290139A EP1564381B1 EP 1564381 B1 EP1564381 B1 EP 1564381B1 EP 05290139 A EP05290139 A EP 05290139A EP 1564381 B1 EP1564381 B1 EP 1564381B1
Authority
EP
European Patent Office
Prior art keywords
lever
washer
control lever
control
crimping
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.)
Expired - Lifetime
Application number
EP05290139.4A
Other languages
English (en)
French (fr)
Other versions
EP1564381A1 (de
Inventor
Claude Lejars
Bruce Pontoizeau
Richard Staessen
Nicolas Triconnet
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.)
Safran Aircraft Engines SAS
Original Assignee
SNECMA SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SNECMA SAS filed Critical SNECMA SAS
Publication of EP1564381A1 publication Critical patent/EP1564381A1/de
Application granted granted Critical
Publication of EP1564381B1 publication Critical patent/EP1564381B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to a lever for controlling the angular setting of a blade in a turbomachine, in particular the angular setting of a rectifier in a compressor stage of the turbomachine.
  • the document FR-A1-2 793 521 discloses a control rod formed by a laminated structure.
  • Adjusting the angular setting of certain stator blades in a turbomachine is intended to optimize the efficiency of this turbomachine and to reduce its fuel consumption in the various flight configurations.
  • This adjustment is generally carried out, for one or more rows of blades, by means of a control ring which externally surrounds the stator of the turbomachine and which is displaceable in rotation around the longitudinal axis of the stator by a motor means. such as a cylinder or an electric motor.
  • the rotation of the ring is transmitted by lever-type control levers to the blades of the row, each control lever being integral with a blade at one of its ends and carrying at its other end a pin which is engaged. in a cylindrical housing of the control ring.
  • the pin is mounted in an orifice of the end of the lever and is fixed on the lever by crimping, this operation consisting in crushing the end of the pin on the end of the lever which rests on an annular collar of the pin. This operation generates significant constraints in the portion of the lever on which the crimping of the pin is made, which weakens this part of the lever.
  • the mechanical strength of the lever being reduced by crimping the pin, cracks or cracks may appear on the lever after a certain time of operation of the turbomachine and cause the rupture of the control lever, which can cause the stop of the turbomachine and must therefore be considered a very serious incident.
  • the present invention is essentially to eliminate this risk of breaking control levers.
  • a lever for controlling the angular setting of a blade in a turbomachine said lever having a first end intended to be mounted on a blade pivot to drive it in rotation and a second end comprising a cylindrical pin of mounting on a control ring, this pin being fixed by crimping one of its ends in an orifice of the second end of the lever and having an annular collar on which is applied the second end of the lever, characterized in that a washer crimping stress distribution is interposed between the second end of the lever and the crimped end of the pin.
  • the surface of the lever is no longer in direct contact with the crimped portion of the pin and the crimping stresses are distributed over a surface of the lever which is sufficient to avoid embrittlement of the lever.
  • the washer makes it possible to distribute the crimping stresses over a sufficient surface and has the advantage of being simple and very inexpensive.
  • the washer is made of a softer material than that of the control lever. This allows the washer to absorb mechanical crimping forces by deforming plastically and effectively protect the second lever end against mechanical aggression during crimping.
  • the washer is made of a material harder than that of the control lever. This washer has less tendency to deform than in the first embodiment and better distributes crimping constraints.
  • the substantially flat annular surface of the washer, applied on the second end of the lever has a convex annular edge or bevelled at its outer periphery.
  • an advantage of the present invention is to avoid in a simple, effective and inexpensive way the risks of rupture of the control levers of the angular setting of the rectifiers of the compressor stages in a turbomachine, which could result from the crimping of the pieces at the ends of the levers.
  • each stage of the compressor comprises a row of vanes 2 mounted on the stator and a row of vanes 3 carried by the rotor.
  • the blades 2 of the stator are rectifiers whose angular orientation is adjustable using control levers 4, driven in rotation by a control ring 5 actuated by a cylinder or an electric motor.
  • Each control lever 4 is fixed by one end 6 on a radial pivot 7 of a blade 2, the pivot 7 being guided in rotation in a bearing 8 mounted in a radial orifice of the housing 9.
  • the other end 10 of the lever control 4 carries a pin 11 which is crimped on this end 10 of the control lever 4 and is guided in rotation in a cylindrical sleeve 12 of the control ring 6.
  • FIGS. 2 and 3 illustrate the crimping of a pin 11 on the end 10 of the control lever in the known art, the pin being generally made of steel and the lever made of titanium.
  • the pin Before crimping, the pin is a straight cylindrical element which has an annular collar 13 in the vicinity of one of its ends.
  • This flange 13 forms a support for the end 10 of the lever 4, which has an orifice in which is engaged the upper end 14 of the pin.
  • This end of the pin 11 comprises, above the flange 13, a cylindrical axial bore for crimping the pin on the end 10 of the lever. The crimping is accomplished by press-fitting a suitable tool into the bore to fold down and flatten the top end 14 of the pin on the end 10 of the lever as shown in FIG. figure 3 .
  • the present invention makes it possible to eliminate this risk by means of stress distribution means interposed between the crimped end of the pin and the end of the control lever 4.
  • FIGS. 4 and 5 illustrate two embodiments of these stress distribution means, which are formed of a flat washer 16, 17 with a circular contour having an axial circular orifice whose diameter is slightly greater than the diameter of the pin 11.
  • the thickness of the washer is of the order of a millimeter and the outer diameter of the washer does not exceed that of the flange 13 of the pin 11.
  • the washer 16 is a washer with two parallel and identical flat faces and is made of a softer material than that of the lever 4, that is to say of material which has a Young's modulus lower than that of the material of the lever 4, which is usually made of titanium.
  • the washer 16, for example of polymer, can deform plastically during crimping without damaging the control lever 4 and distributing the stresses on the end 10 of the lever 4.
  • the washer 17 interposed between the crimped end of the pin and the lever 4 is made of a material having a Young's modulus greater than that of the material of the control lever 4.
  • This material may be, for example, a polymer or a metal .
  • the washer 17 has a surface 18 in contact with the end 10 of the lever 4, which is formed with a convex annular edge 19 over its entire outer periphery ( figure 6 ) or with a chamfered outer edge ( figure 7 ).
  • This configuration of the washer 17 makes it possible not to create stress peaks in the lever 4 at the outer periphery of the washer, during crimping, the convex rounding 19 or the chamfer 20 to gradually release the stresses in the material of the lever 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Control Of Turbines (AREA)

Claims (9)

  1. Stellhebel zum Einstellen der Winkelstellung einer Schaufel in einer Turbomaschine bzw. einem Turbotriebwerk, wobei der Hebel (4) ein erstes Ende (6) aufweist, das dazu bestimmt ist, an einem Drehzapfen (7) einer Schaufel (2) gelagert zu werden, um es drehend mitzunehmen, sowie ein zweites Ende (10) mit einem Zylinderstift (11) zur Lagerung an einem Steuerring (5), wobei dieser Stift (11) durch Einpressen eines seiner Enden in eine Öffnung des zweiten Endes (10) des Hebels (4) fixiert ist und einen ringförmigen Bund (13) aufweist, an dem das zweite Ende (10) des Hebels (4) aufliegt, dadurch gekennzeichnet, dass eine Scheibe (16, 17) zum Verteilen von Pressspannungen zwischen dem zweiten Ende (10) des Hebels (4) und dem eingepressten Ende (14) des Stifts eingesetzt ist.
  2. Stellhebel (4) nach Anspruch 1, dadurch gekennzeichnet, dass die Scheibe (16) aus einem Material hergestellt ist, das weicher als das des Stellhebels (4) ist.
  3. Stellhebel nach Anspruch 2, dadurch gekennzeichnet, dass die Scheibe (16) aus Polymer besteht.
  4. Stellhebel nach Anspruch 1, dadurch gekennzeichnet, dass die Scheibe (17) aus einem Material besteht, das härter als das des Stellhebels (4) ist.
  5. Stellhebel nach Anspruch 4, dadurch gekennzeichnet, dass die Scheibe (17) aus Polymer oder aus Metall besteht.
  6. Stellhebel nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Scheibe (17) eine im Wesentlichen ebene, ringförmige Fläche aufweist, die am zweiten Ende (10) des Hebels (4) aufliegt und an ihrem Außenumfang einen konvex verlaufenden (19) oder abgeschrägten (20) Ringrand aufweist.
  7. Stellhebel nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Dicke der Scheibe (16, 17) im Millimeterbereich liegt.
  8. Stellhebel nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Scheibe (16, 17) einen Außendurchmesser gleich oder geringfügig kleiner als der des Bundes (13) des Stifts (11) ist.
  9. Stellhebel nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass er aus Titan hergestellt ist und der Stift (11) aus Stahl hergestellt ist.
EP05290139.4A 2004-02-05 2005-01-21 Stellhebel an der Schwenkachse einer verstellbaren Leitschaufel in einer Strömungsmaschine. Expired - Lifetime EP1564381B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0401086 2004-02-05
FR0401086A FR2866058B1 (fr) 2004-02-05 2004-02-05 Levier de commande du calage angulaire d'une aube dans une turbomachine

Publications (2)

Publication Number Publication Date
EP1564381A1 EP1564381A1 (de) 2005-08-17
EP1564381B1 true EP1564381B1 (de) 2015-10-28

Family

ID=34684992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05290139.4A Expired - Lifetime EP1564381B1 (de) 2004-02-05 2005-01-21 Stellhebel an der Schwenkachse einer verstellbaren Leitschaufel in einer Strömungsmaschine.

Country Status (7)

Country Link
US (1) US7281892B2 (de)
EP (1) EP1564381B1 (de)
JP (1) JP4806199B2 (de)
CA (1) CA2494770C (de)
FR (1) FR2866058B1 (de)
RU (1) RU2355893C2 (de)
UA (1) UA83466C2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1722073B1 (de) * 2005-05-13 2013-01-23 BorgWarner, Inc. Verstellring zum Verstellen der Schaufeln des VTG-Leitapparates von Abgasturboladern
US9353643B2 (en) * 2007-04-10 2016-05-31 United Technologies Corporation Variable stator vane assembly for a turbine engine
US8668444B2 (en) * 2010-09-28 2014-03-11 General Electric Company Attachment stud for a variable vane assembly of a turbine compressor
DE102013002968A1 (de) * 2013-02-22 2014-08-28 Dt Swiss Ag Laufrad für wenigstens teilweise muskelbetriebene Fahrzeuge und insbesondere Fahrräder
US9784285B2 (en) 2014-09-12 2017-10-10 Honeywell International Inc. Variable stator vane assemblies and variable stator vanes thereof having a locally swept leading edge and methods for minimizing endwall leakage therewith

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325087A (en) * 1965-04-28 1967-06-13 David R Davis Stator casing construction for gas turbine engines
US3788463A (en) * 1972-01-31 1974-01-29 Maryland Cup Corp Bundling method and article produced thereby
US3788763A (en) * 1972-11-01 1974-01-29 Gen Motors Corp Variable vanes
FR2608678B1 (fr) * 1986-12-17 1991-02-08 Snecma Dispositif de commande d'aubes a calage variable de redresseur de turbomachine
GB8913988D0 (en) * 1989-06-17 1989-08-09 Rolls Royce Plc Improvements in or relating to control of variable stator vanes
CA2082709A1 (en) * 1991-12-02 1993-06-03 Srinivasan Venkatasubbu Variable stator vane assembly for an axial flow compressor of a gas turbine engine
RU2117826C1 (ru) * 1995-03-27 1998-08-20 Акционерное общество открытого типа "А.Люлька-Сатурн" Статор компрессора газотурбинного двигателя
JP2000210737A (ja) * 1999-01-25 2000-08-02 Yuusu Kitaura:Kk かしめ結合方法およびかしめ結合構造
FR2793521B1 (fr) 1999-05-10 2005-09-23 Techlam Biellette de commande d'aube a calage variable
FR2814206B1 (fr) * 2000-09-18 2002-12-20 Snecma Moteurs Dispositif de commande d'aubes a calage variable
FR2835562B1 (fr) * 2002-02-07 2004-07-16 Snecma Moteurs Agencement de pivotement d'aube de stator dans une turbomachine
RU2219378C1 (ru) * 2002-10-01 2003-12-20 Иванов Адольф Павлович Статор компрессора газотурбинного двигателя

Also Published As

Publication number Publication date
UA83466C2 (uk) 2008-07-25
EP1564381A1 (de) 2005-08-17
FR2866058B1 (fr) 2006-06-02
JP2005220907A (ja) 2005-08-18
RU2355893C2 (ru) 2009-05-20
CA2494770A1 (fr) 2005-08-05
US7281892B2 (en) 2007-10-16
US20050175445A1 (en) 2005-08-11
RU2005102775A (ru) 2006-07-10
FR2866058A1 (fr) 2005-08-12
JP4806199B2 (ja) 2011-11-02
CA2494770C (fr) 2012-08-28

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