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
  • 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
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B2/00—Friction-grip releasable fastenings
  • F16B2/20—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening
  • F16B2/22—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material
  • F16B2/24—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal
  • F16B2/241—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal
  • F16B2/245—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal external, i.e. with contracting action
• • 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
• • 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
  • F05D2230/70—Disassembly 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
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T50/00—Aeronautics or air transport
  • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
• • 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
  • Y10T24/00—Buckles, buttons, clasps, etc.
  • Y10T24/44—Clasp, clip, support-clamp, or required component thereof
  • Y10T24/44017—Clasp, clip, support-clamp, or required component thereof with specific mounting means for attaching to rigid or semirigid supporting structure or structure-to-be-secured

Definitions

• the present invention relates generally to a locking member for a ring sector fixing device on an aircraft turbomachine casing, for example a turbine casing.
• the invention also relates to a turbomachine for an aircraft comprising such locking members, this turbomachine being able to take the form of a turboprop or a turbojet engine.
• ring sectors circumferentially fixed on the housing around the turbine blades of a turbojet engine, these sectors jointly forming a continuous cylindrical envelope externally defining the passage of the gas passage in the turbine .
• the ring sectors are mounted on an inner casing of the turbine by means of crankcase elements, called intermediate crankcase elements or spacers, on which they are hooked at their front end and held at their rear end by locking C-shaped or U-coated. These are engaged axially / longitudinally from the rear on circumferential flanges of the rear ends of the ring sectors and the intermediate housing members, to keep them radially pressed against each other.
• This fixing ring sectors on the intermediate elements of the turbine housing allows them to follow the thermal expansion and contraction of the turbine housing, in which hot gases or cold gases are injected to control its thermal expansion and contraction in order to to keep a radial clearance as low as possible between the inner surfaces of the ring sectors and the ends of the blades of the turbine, and thus increase the efficiency of the turbine.
• the locking members together form an annular locking device centered on the axis of the turbomachine, each member thus forming only an angular sector of this device.
• Each member comprises two longitudinal clamping branches extending axially / longitudinally rearwards and connected at their rear ends by a connecting branch, while their front ends are intended to press between them at least one ring sector. against at least one crankcase element. These last two elements radially pressed against each other are actually provided to be housed in the space formed between the two longitudinal branches, open longitudinally forwards.
• the locking members are designed, in particular with regard to the elasticity and spacing of the two longitudinal branches, for the applied radial clamping is effective.
• the invention firstly relates to a locking member for a ring sector fixing device on an aircraft turbomachine casing, said member extending in a circumferential direction between a first circumferential end. and a second circumferential end, said member having, in section along a plane orthogonal to said circumferential direction, two clamping legs interconnected at their rear end by a connecting branch extending substantially parallel to a general spacing direction of two clamping legs, the front ends of the two clamping arms being intended to press between them at least one ring sector against at least one housing element.
• said member is provided, on either side of a fictitious median plane orthogonal to said circumferential direction, with a passage for gripping said member, each passage being traversed in said connecting branch. , opening into an interbranch space defined between said clamping limbs.
• the member according to the invention provides in an original way means for its gripping, intended to facilitate its extraction after it has been set up on the ring sectors, for example using a suitable tool.
• the particular positioning of the passages through the connecting branch implies that they can easily cooperate with an extraction tool without risk. to deteriorate the functionality of this locking member, particularly because of the lack of direct contact between the tool and the aforementioned front ends.
• the fact of gripping these passages with a tool does not generate any direct mechanical stress on the clamping legs which therefore can not be damaged by the pressure of the tool, the stresses being indeed concentrated on the connection branch offset towards the rear of the sensitive zone.
• This advantage is also found in the preferred case where the tool is intended to pass through the passages to enter the intersbranch space, so that the ends of this tool abut against the inner surface of the connecting branch, close to these same passages.
• the tool cooperates with the walls of the passages, and / or with the inner surface of the connecting branch.
• each passage extends along a guideline substantially orthogonal to the circumferential direction and the spacing direction.
• this line is a straight line, for example extending substantially axially, thus with the aforementioned spacing direction corresponding to the radial direction.
• each straight line is preferably parallel to an axis of a turbine equipped with a plurality of these members to ensure the plating of the ring sectors against crankcase elements.
• orientation of the guidelines of the passages could be different from the axial / longitudinal direction, without departing from the scope of the invention.
• the two passages are arranged on or near respectively said first circumferential end and said second circumferential end. These ends correspond to the portions of the organ that are least stressed when the latter is in the tightening condition of the ring sectors, so that the presence of the passages at these locations only creates a negligible mechanical weakening of the body. , requiring no oversizing of the surrounding areas.
• each passage is substantially cylindrical, of axis corresponding to said guideline.
• each passage takes the form of a groove extending along the guideline, namely that the bottom of this groove extends substantially parallel to the radial direction.
• each groove is made to open in said circumferential direction.
• each groove has, in view taken externally with respect to the member and according to said guideline, a substantially semi-circular or substantially semi-oblong shape.
• each groove allows the crossing of the connecting branch by a tool, whose ends can then cooperate with the inner surface of this branch, near the grooves.
• the aforementioned inner surface thus constitutes an abutment surface for the tool, substantially oriented towards the intersbranch space that it defines.
• This abutment surface can indeed serve as a bearing surface for an extraction tool, which can then be biased in the longitudinal direction towards the rear to cause the desired extraction.
• each passage has, in a view taken externally with respect to the member and according to said guideline, a closed delimitation line.
• a closed delimitation line may be a delimitation line of generally oblong or circle-like shape, of the bore type.
• the locking member forms an angular sector of an annular locking device intended to be centered on the axis of the turbine equipped with such a device.
• the invention also relates to a device for fixing ring sectors on an aircraft turbomachine casing, comprising casing elements formed with first flanges. rear circumferences on which second circumferential rear flanges of the ring sectors are applied, the fastening device further comprising a plurality of locking members as described above, engaged on said first and second circumferential flanges to maintain them plated. against each other.
• the first and second circumferential rims extending rearwardly in the longitudinal direction, thus penetrate through the front opening of the members defined between the clamping limbs, in order to be kept radially plated thereon. against each other.
• the invention also relates to an aircraft turbomachine turbine comprising a ring sector fixing device as described above, and / or at least one locking member as described above. It could alternatively be a turbomachine compressor, without departing from the scope of the invention.
• the subject of the invention is an aircraft turbine engine comprising a turbine as described above, and / or a device for fixing ring sectors as described above, and / or at least one locking as described above, this turbomachine can indifferently be a turbojet or a turboprop.
• FIG. 1 shows a partial longitudinal sectional view of a ring sector fixing device on an aircraft turbomachine turbine casing, according to a preferred embodiment of the present invention, this view also corresponding to a view taken in section along the plane Pl of Figure 3, orthogonal to the circumferential direction and passing through one of the passages for gripping the organ;
• FIGS. 6a to 6c schematize a method of extracting the locking member shown in Figures 1 to 5, with Figure 6b corresponding to a sectional view taken along the line VIb-VIb of Figure 6a;
• FIG. 7 shows a similar view to that shown in Figure 3, the locking member being respectively in the form of an alternative embodiment.
• FIGS. 1 and 2 With reference in conjunction with FIGS. 1 and 2, there can be seen a device for fixing ring sectors on an aircraft turbine engine turbine casing, according to a preferred embodiment of the present invention.
• the direction A corresponds to the longitudinal direction or axial direction, parallel to the longitudinal axis 2 of the turbine and the turbomachine.
• the direction B corresponds to the radial direction of the turbine, and the direction C to the circumferential direction.
• the arrow 4 schematizes the main flow direction of the gas within the turbomachine, parallel to the direction A, the terms "before”, “upstream”, “back”, “downstream” used in the rest of the description being to be considered with respect to a direction of advancement of the aircraft under the action of the thrust of the turbomachine, this direction of advancement being contrary to the direction of the arrow 4.
• the reference numeral 10 denotes the blades of a turbine engine of a high-pressure turbine stage, which rotate in a turbine casing 12 inside which elements are fixed. housing 14, called spacers or intermediate crankcase elements.
• the elements 14 carry ring sectors 16 arranged circumferentially around the axis of rotation 2 of the turbine, in the direction C, the internal surfaces of these ring sectors forming a continuous cylindrical surface which delimits externally a vein of passage of gas in the turbine.
• the ring sectors 16 have an angular extent around the axis of the turbine, in the direction C, of about 10 to 20 °, and are for example thirty in number.
• Each ring sector 16 comprises at its upstream end or forward end a circumferential edge 18 in cylinder portion, by which it is hooked or fixed on a spacer 14, and also comprises at its rear end or downstream end a circumferential rim 20 in portion of cylinder which is applied on a circumferential rim 22 corresponding in cylinder portion of the spacer 14.
• the circumferential flange 22 is said first circumferential flange
• the circumferential flange 20 is said second circumferential rim.
• each member 24 takes the form of an angular sector of the annular locking device, extending for example about 10 to 20 °, in the direction C.
• a complete ring preferably continuous, they are provided adjacent in the direction C, for example the number of about thirty centered on the axis 2.
• the locking members 24 are metallic, metal matrix composite (CMC), or other materials, and the locking members 24 are resiliently mounted tightly on the circumferential edges 20 and 22, to press them against each other with some prestressing in the radial direction B, as will be detailed hereinafter.
• CMC metal matrix composite
• the second circumferential rim 20 of the ring sector 16 terminates at its rear end. by radial teeth 26 facing outwards, and engaged in corresponding notches of the first circumferential rim 22 of the spacer 14, so as to immobilize each ring sector 16 in rotation about the axis 2 of the turbine on a spacer 14.
• each locking member 24 comprises, in section along a plane orthogonal to the direction C, as is the case in FIG. 2, two clamping limbs 28 and 30, called the radially external and radially inner longitudinal branches, respectively , which are rigidly connected to each other at their rear end by a connecting branch 32, and whose front ends are applied to the outer cylindrical face of the first circumferential flange 22 of the spacer 14 and to the inner cylindrical face of the second circumferential flange 20 of the ring sector 16, respectively.
• the circumferential branches 28, 30 extend longitudinally in the direction A, and are spaced apart from one another in a general spacing direction, here preferably corresponding to the radial direction B.
• the circumferential branch 32 s it extends substantially in this direction of spacing, namely in the radial direction B, to connect the two rear ends of the branches 28, 30.
• These two last branches together form an interbranch space 40 open forwards in the direction A for the passage of the flanges 20, 22, and closed backwards in this same direction A by the branch of fitting 32, and more specifically by an inner surface 33 thereof.
• FIG. 2 shows that the member 24 takes, in section orthogonal to the direction C, the shape of a C or a lying-down U, it should be understood that the member extends in this form over a sector angle given in the direction C, between a first circumferential end 24a and a second circumferential end 24b, as shown in FIG.
• one of the peculiarities of the present invention resides in the implantation, preferably at the circumferential ends 24a, 24b or in the vicinity thereof, of means making it possible to grip the locking member. 24, generally arranged towards the rear of the latter, namely on the connecting branch 32.
• each groove 42 take the form of two passages, each groove-shaped, respectively provided on either side of the plane P2 constituting a fictitious median plane orthogonal to the direction C. More precisely and as mentioned above, the two grooves 42 are respectively arranged at the ends 24a, 24b, and have the particularity of extending each along a straight line 44, preferably arranged axially, parallel to the branches 28, 30 and orthogonally to the connecting branch 32. As an indication, the two straight lines 44 are therefore substantially parallel to each other, and spaced corconférentiellement one of the other. With reference in conjunction with FIGS. 3 to 5, it can be seen that each groove 42 extends cylindrically along its straight line 44, being practiced through the branch 32, to open into space interbranch 40, at the inner surface 33.
• each groove 42 is formed only through the branch 32, away from the two branches 28, 30. Nevertheless, each groove could extend more significantly in the radial direction B, for example until to the two clamping limbs 28, 30 without departing from the scope of the invention.
• Each groove 42 opens in the circumferential direction C, namely that its bottom 46 is oriented in this same direction, towards the outside of the body.
• the groove 42 has a substantially semi-oblong shape, with the half-diameter of a circle corresponding to the bottom 46 of the groove.
• This bottom 46 forms a gripping surface for an extraction tool.
• the gripping of the member with the tool is preferably effected by means of the inner surface 33 of the branch 32 forming an abutment surface for the ends of a tool which has passed through the same branch 32, by the grooves 42 provided for this purpose.
• This abutment surface 33 can indeed serve as a bearing surface for an extraction tool of the member 24, which can then be biased in the longitudinal direction towards the rear to cause the desired extraction.
• the particular positioning of these grooves, offset rearwardly on the member 32, implies that the extraction tool can easily cooperate with the member without the risk of damaging the functionality thereof, particularly because of the absence of direct contact between the tool and the front end of the branches 28, 30. Referring now to FIGS.
• FIG. 6c there is shown schematically a method for extracting a locking member 24 initially located in its clamping position of the ring sectors 16, shown in the previous figures.
• a tool 50 of appropriate shape is used, this tool having generally a stirrup-shaped head having two arms respectively provided with two ends 52 facing one another, which can be moved according to the direction C.
• the two facing ends 52 are respectively inserted into the two grooves 42 to penetrate the interspaced space 40, for example by moving the tool relative to the member 24 in the direction A.
• the two ends 52 are spaced from each other in the direction C, to be brought facing the inner surface 33 of the branch 32, near the two grooves 42 respectively .
• each passage 42 has, in view (not shown) taken externally to the body and according to the guideline 44, a closed boundary line 60, for example of circular or oblong shape.
• the passages 42 made in the branch 32 are naturally traversing, in particular to allow, as in the first preferred embodiment, the introduction of the ends of an extraction tool in the intersbranch space, with a view to their cooperation with the internal stop surface of clamping branch 32.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=39996625

Family Applications (1)

Country Status (9)

Families Citing this family (14)

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• 2008
  • 2008-05-16 FR FR0853183A patent/FR2931197B1/fr active Active
• 2009
  • 2009-05-14 WO PCT/EP2009/055814 patent/WO2009138444A1/fr active Application Filing
  • 2009-05-14 CA CA2724259A patent/CA2724259A1/fr not_active Abandoned
  • 2009-05-14 CN CN200980122083.9A patent/CN102027200B/zh not_active Expired - Fee Related
  • 2009-05-14 US US12/991,641 patent/US20110056055A1/en not_active Abandoned
  • 2009-05-14 EP EP09745776A patent/EP2297432A1/fr not_active Withdrawn
  • 2009-05-14 RU RU2010151724/06A patent/RU2493375C2/ru not_active IP Right Cessation
  • 2009-05-14 JP JP2011508913A patent/JP5385376B2/ja not_active Expired - Fee Related
  • 2009-05-14 BR BRPI0912016A patent/BRPI0912016A2/pt not_active IP Right Cessation

Non-Patent Citations (1)

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