EP3298244A1 - Ensemble d'anneau de turbine avec maintien axial - Google Patents
Ensemble d'anneau de turbine avec maintien axialInfo
- Publication number
- EP3298244A1 EP3298244A1 EP16726365.6A EP16726365A EP3298244A1 EP 3298244 A1 EP3298244 A1 EP 3298244A1 EP 16726365 A EP16726365 A EP 16726365A EP 3298244 A1 EP3298244 A1 EP 3298244A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring
- support structure
- sectors
- turbine
- flanges
- 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.)
- Granted
Links
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
- 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
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
-
- 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
- F05D2240/00—Components
- F05D2240/10—Stators
- F05D2240/11—Shroud seal segments
-
- 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
- F05D2300/00—Materials; Properties thereof
- F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
- F05D2300/603—Composites; e.g. fibre-reinforced
- F05D2300/6033—Ceramic matrix composites [CMC]
Definitions
- the invention relates to a turbine ring assembly for a turbomachine, which assembly comprises a plurality of one-piece ceramic matrix composite ring sectors and a ring support structure.
- the field of application of the invention is in particular that of aeronautical gas turbine engines.
- the invention is however applicable to other turbomachines, for example industrial turbines.
- Ceramic matrix composite materials are known for their good mechanical properties that make them suitable for constituting structural elements, and for their ability to retain these properties at high temperatures.
- the ring sectors comprise an annular base whose inner face defines the inner face of the turbine ring and an outer face from which two leg portions extend. whose ends are engaged in housings of a metal ring support structure.
- the flanges of the ring support structure may no longer be in contact with the legs of the sectors or, at contrary, exert too much stress on the legs of the sectors, which can damage them.
- the maintenance of the ring sectors on the ring support structure requires the use of a U-section clamp, which complicates the assembly of the sectors and increases the cost of the whole.
- the invention aims to avoid such drawbacks and proposes for this purpose a turbine ring assembly comprising a plurality of ring sectors forming a ring and a ring support structure comprising two annular flanges, each ring sector. having a first annular base portion with an inner face defining the inner face of the turbine ring and an outer face from which two legs extend radially, the legs of each ring sector being held between the two flanges rings of the ring support structure, the two annular flanges of the ring support structure stressing the tabs of the ring sectors, at least one of the flanges of the ring support structure being elastically deformable in the axial direction of the ring, characterized in that each ring sector is made of ceramic matrix composite material and in that the turbine ring assembly further comprises a plurality of pions engaged both in at least one of the annular flanges of the ring support structure and the tabs of the ring sectors facing said at least one annular flange.
- the presence of the pins makes it possible to maintain the radial and circumferential positions of the ring sectors on the ring support structure. Indeed, the pins being engaged both in at least one annular flange of the ring support structure and in the legs of the ring sectors facing the flange concerned, it is possible to prevent slipping or displacement possible ring sectors in the circumferential and radial directions of the ring relative to the ring support structure, even in the event of contact between the vertex of a rotating blade and one or more sectors of ring.
- the contact between the flanges of the ring support structure and the tabs of the ring sectors can be maintained independently of temperature variations.
- the ring sectors can be mounted between the flanges with a "cold" prestressing, so that the contact between the ring sectors and the flanges is assured regardless of the temperature conditions.
- the flexibility of at least one of the flanges of the ring support structure allows its deformation to accommodate the differential thermal expansion between the ring sectors and the flanges so as to avoid exerting too much stress on the ring sectors.
- At least one of the annular flanges of the ring support structure comprises a lip on its face opposite the tabs of the ring sectors.
- the presence of a lip on a flange facilitates the definition of the contact portion between the flange of the ring support structure and the tabs of the ring sectors facing it.
- the elastically deformable flange of the ring support structure comprises a plurality of hooks distributed on its face opposite to that opposite the legs of the sectors of ring.
- the presence of the hooks facilitates the spacing of the elastically deformable flange for the insertion of the tabs of the ring sectors between the flanges without having to slide forcibly the tabs between the flanges.
- each elastically deformable flange of the ring support structure has a thickness less than that of the other flange of said ring support structure.
- the present invention also relates to a method of producing a turbine ring assembly comprising
- each ring sector having a first annular base portion with an inner face defining the inner face of the turbine ring and an outer face from which extend radially two legs,
- the spacing between the two flanges of the ring structure being less than the distance between the outer faces of the tabs of each ring sector, at least one of the flanges of the ring support structure being elastically deformable in the direction axial of the ring,
- each ring sector is made of ceramic matrix composite material, and in that the method further comprises engaging a plurality of pins in both at least one of the annular flanges of the ring support structure and the legs of the ring sectors facing said at least one annular flange.
- locking pins makes it possible to maintain the radial and circumferential positions of the ring sectors on the ring support structure. Indeed, the pins being engaged both in at least one annular flange of the ring support structure and in the legs of the ring sectors facing the flange concerned, it is possible to prevent slipping or displacement possible ring sectors in the circumferential and radial directions of the ring relative to the ring support structure, even in the event of contact between the vertex of a rotating blade and one or more sectors of ring.
- At least one of the annular flanges of the ring support structure comprises a lip on its face opposite the legs of the sectors of the invention. ring.
- the elastically deformable flange of the ring support structure comprises a plurality of hooks distributed on its opposite side to that facing the legs. ring sectors, the traction in the axial direction of the ring exerted on said elastically deformable flange being performed by a tool engaged in one or more hooks.
- the flange elastically of the ring support structure has a thickness less than that of the other flange of said ring support structure
- FIG. 1 is a radial half-sectional view showing an embodiment of a turbine ring assembly according to the invention
- Figures 2 to 4 show schematically the mounting of a ring sector in the ring support structure of the ring assembly of Figure 1;
- FIG. 5 is a schematic perspective view showing an alternative embodiment of the hooks present on an elastically deformable ring support structure flange
- FIG. 6 is a schematic perspective view showing another alternative embodiment of the hooks present on an elastically deformable ring support structure flange. Detailed description of embodiments
- FIG. 1 shows a high pressure turbine ring assembly comprising a turbine ring 1 made of ceramic matrix composite material (CMC) and a metal ring support structure 3.
- the turbine ring 1 surrounds a set of blades 5.
- the turbine ring 1 is formed of a plurality of ring sectors 10, Figure 1 being a radial sectional view along a plane passing between two sectors of contiguous rings.
- the arrow DA indicates the axial direction with respect to the turbine ring 1 while the arrow DR indicates the radial direction with respect to the turbine ring 1.
- Each ring sector 10 has a substantially inverted ⁇ -shaped section with an annular base 12 whose inner face coated with a layer 13 of abradable material and / or a thermal barrier defines the flow stream of gaseous flow in the turbine.
- Upstream and downstream tabs 14, 16 extend from the outer face of the annular base 12 in the radial direction DR.
- upstream and downstream are used herein with reference to the flow direction of the gas flow in the turbine (arrow F).
- the ring support structure 3 which is integral with a turbine casing 30 comprises an annular upstream radial flange 32 having a lip 34 on its face opposite the upstream lugs 14 of the ring sectors 10, the lip 34 being in bearing on the outer face 14a of the upstream tabs 14.
- the ring support structure comprises an annular downstream radial flange 36 having a lip 38 on its face opposite the downstream tabs 16 of the ring sectors 10, the lip 38 being supported on the outer face 16a of the downstream tabs 16.
- the lugs 14 and 16 of each ring sector 10 are preloaded between the annular flanges 32 and 54 so that the flanges exert, at least "cold", it is that is to say at an ambient temperature of about 20 ° C, but also at all operating temperatures of the turbine, a stress on the lugs 14 and 16 and thus a tightening of the sectors by the flanges.
- This stress is maintained at all temperatures at which the ring assembly can be subjected during operation of the turbine and is controlled, that is to say without over-constraining the ring sectors, thanks to the presence of at least one elastically deformable flange as explained above.
- the ring sectors 10 are further maintained by blocking pins. More precisely and as illustrated in FIG. 1, pins 40 are engaged both in the annular upstream radial flange 32 of the ring support structure 3 and in the upstream lugs 14 of the ring sectors 10. For this purpose , the pawns
- the pins 41 are engaged both in the annular downstream radial flange 36 of the ring support structure 3 and in the downstream lugs 16 of the ring sectors 10.
- the pins 41 each pass respectively through an orifice 37 formed in the annular downstream radial flange 36 and an orifice 17 formed in each downstream lug 16, the orifices 37 and 17 being aligned during the assembly of the ring sectors 10 on the ring support structure 3.
- the presence of the pins makes it possible to maintain the radial and circumferential positions of the ring sectors on the ring support structure.
- the pins being engaged both in at least one annular flange of the ring support structure and in the legs of the ring sectors facing the flange concerned, it is possible to prevent slipping or displacement possible ring sectors in the circumferential and radial directions of the ring relative to the ring support structure, even in the event of contact between the vertex of a rotating blade and one or more sectors of ring.
- inter-sector sealing is provided by sealing tabs housed in grooves facing in the opposite edges of two neighboring ring sectors.
- a tongue 22a extends over almost the entire length of the annular base 12 in the middle portion thereof.
- Another tab 22b extends along the tab 14 and on a portion of the annular base 12.
- Another tab 22c extends along the tab 16. At one end, the tab 22c abuts the tab 22a and on the tongue 22b.
- the tongues 22a, 22b, 22c are for example metallic and are mounted with cold play in their housings to ensure the sealing function at the temperatures encountered in service.
- this assembly is carried out at a distance from the hot face of the annular base 12 exposed to the gas flow,
- the tabs 14, 16 advantageously have a relatively large radial section relative to their average thickness so that an effective thermal decoupling is obtained between the annular base 12 and the ends of the tabs 14, 16, and
- one of the flanges of the ring structure is elastically deformable, which makes it possible to compensate for the differential expansions between the tabs of the CMC ring sectors and the flanges of the metal ring support structure without significantly increasing the stress exerted "cold" by the flanges on the legs of the ring sectors.
- ventilation holes 32a formed in the flange 32 make it possible to supply cooling air to the outside of the turbine ring 10.
- Each ring sector 10 described above is made of ceramic matrix composite material (CMC) by forming a fibrous preform having a shape close to that of the ring sector and densification of the ring sector by a ceramic matrix .
- CMC ceramic matrix composite material
- Ceramic fiber yarns for example SiC fiber yarns, such as those marketed by the Japanese company Nippon Carbon under the name "Nicalon”, or carbon fiber yarns.
- the fiber preform is advantageously made by three-dimensional weaving, or multilayer weaving with development of debonding zones to separate the preform portions corresponding to the tabs 14 and 16 of the sectors 10.
- the weave can be interlock type, as illustrated.
- Other weaves of three-dimensional weave or multilayer can be used as for example multi-web or multi-satin weaves.
- the blank After weaving, the blank can be shaped to obtain a ring sector preform which is consolidated and densified by a ceramic matrix, the densification can be achieved in particular by chemical vapor infiltration (CVI) or an MI process ( "Melt Infiltrated", liquid silicon introduced into the fibrous preform by capillarity, the preform being previously consolidated by a CVI phase) which are well known per se.
- CVI chemical vapor infiltration
- MI process "Melt Infiltrated", liquid silicon introduced into the fibrous preform by capillarity, the preform being previously consolidated by a CVI phase
- the ring support structure 3 is made of a metallic material such as inconel, the C263 superalloy or Waspaloy®.
- the realization of the turbine ring assembly is continued by mounting the ring sectors 10 on the ring support structure 3.
- the gap E between the annular upstream radial flange 32 and the annular downstream radial flange 36 at "rest", that is to say when no ring sector is mounted between the flanges is smaller than the distance D present between the outer faces 14a and 16a of the upstream legs and downstream 14 and 16 of the ring sectors.
- the gap E is measured between the lips 34 and 38 present respectively at the end of the annular flanges 32 and 36.
- the spacing is measured between the inner faces of the flanges which will be in contact with the outer surface of the legs of the ring sectors.
- the ring support structure comprises at least one annular flange which is elastically deformable in the axial direction DA of the invention. 'ring.
- the annular downstream radial flange 36 which is elastically deformable.
- the annular downstream radial flange 36 of the ring support structure 3 has a reduced thickness relative to the annular upstream radial flange 32, which gives it a certain elasticity.
- the annular downstream radial flange 36 is pulled in the direction DA as shown in Figures 3 and 4 to increase the spacing between the flanges 32 and 36 and allow the insertion tabs 14 and 16 between the flanges 32 and 36 without risk of damage.
- the downstream radial flange annular 36 In order to facilitate the pulling of the downstream radial flange annular 36, it comprises a plurality of hooks 39 distributed on its face 36a, which face is opposite the face 36b of the flange 36 opposite the downstream tabs 16 of the ring sectors 10 ( Figure 4).
- the traction in the axial direction DA of the ring exerted on the elastically deformable flange 36 is here carried out by means of a tool 50 comprising at least one arm 51 whose end comprises a hook 510 which is engaged in a hook 39 present on the outer face 36a of the flange 36.
- the number of hooks 39 distributed on the face 36a of the flange 36 is defined as a function of the number of traction points that one wishes to have on the flange 36. This number depends mainly on the elastic nature of the flange. Other forms and arrangements of means for exerting traction in the axial direction DA on one of the flanges of the ring support structure can of course be considered within the scope of the present invention.
- each lug 14 or 16 of the ring sector may comprise one or more openings for the passage of a blocking pin .
- FIG. 5 shows an annular downstream radial flange 136 having a plurality of hooks 139 which open in the circumferential direction of the flange and in which a lug 151 of a traction tool is introduced.
- Figure 6 shows an annular downstream radial flange 236 having a plurality of hooks 239 which open in the radial and downward direction of the flange and in which a lug 251 of a pulling tool is introduced.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1554604A FR3036432B1 (fr) | 2015-05-22 | 2015-05-22 | Ensemble d'anneau de turbine avec maintien axial |
| PCT/FR2016/051123 WO2016189215A1 (fr) | 2015-05-22 | 2016-05-12 | Ensemble d'anneau de turbine avec maintien axial |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3298244A1 true EP3298244A1 (fr) | 2018-03-28 |
| EP3298244B1 EP3298244B1 (fr) | 2020-11-11 |
Family
ID=54291388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16726365.6A Active EP3298244B1 (fr) | 2015-05-22 | 2016-05-12 | Ensemble d'anneau de turbine avec maintien axial |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US10690007B2 (fr) |
| EP (1) | EP3298244B1 (fr) |
| JP (1) | JP6689290B2 (fr) |
| CN (1) | CN107709708B (fr) |
| FR (1) | FR3036432B1 (fr) |
| WO (1) | WO2016189215A1 (fr) |
Cited By (1)
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| EP3819475A1 (fr) * | 2019-11-06 | 2021-05-12 | Raytheon Technologies Corporation | Agencement de joint d'air extérieur d'aube et procédé d'étanchéité |
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| FR3049003B1 (fr) * | 2016-03-21 | 2018-04-06 | Safran Aircraft Engines | Ensemble d'anneau de turbine sans jeu de montage a froid |
| FR3055148B1 (fr) * | 2016-08-19 | 2020-06-05 | Safran Aircraft Engines | Ensemble d'anneau de turbine |
| FR3055147B1 (fr) * | 2016-08-19 | 2020-05-29 | Safran Aircraft Engines | Ensemble d'anneau de turbine |
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| FR3090732B1 (fr) * | 2018-12-19 | 2021-01-08 | Safran Aircraft Engines | Ensemble d’anneau de turbine avec flasques indexés. |
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| FR3100048B1 (fr) | 2019-08-23 | 2023-02-24 | Safran Ceram | Anneau de turbine en CMC avec revêtement de protection à épaisseur variable et procédé de fabrication d’un tel anneau |
| FR3100838B1 (fr) * | 2019-09-13 | 2021-10-01 | Safran Aircraft Engines | Anneau d’etancheite de turbomachine |
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| US7246996B2 (en) * | 2005-01-04 | 2007-07-24 | General Electric Company | Methods and apparatus for maintaining rotor assembly tip clearances |
| US7494317B2 (en) * | 2005-06-23 | 2009-02-24 | Siemens Energy, Inc. | Ring seal attachment system |
| FR2887601B1 (fr) | 2005-06-24 | 2007-10-05 | Snecma Moteurs Sa | Piece mecanique et procede de fabrication d'une telle piece |
| FR2938872B1 (fr) * | 2008-11-26 | 2015-11-27 | Snecma | Dispositif anti-usure pour aubes d'un distributeur de turbine d'une turbomachine aeronautique |
| RU2522264C2 (ru) | 2009-03-09 | 2014-07-10 | Снекма | Сборка обоймы турбины |
| US8460118B2 (en) * | 2011-08-31 | 2013-06-11 | United Technologies Corporation | Shaft assembly for a gas turbine engine |
| US9863265B2 (en) * | 2015-04-15 | 2018-01-09 | General Electric Company | Shroud assembly and shroud for gas turbine engine |
| US10145252B2 (en) * | 2015-12-09 | 2018-12-04 | General Electric Company | Abradable compositions and methods for CMC shrouds |
-
2015
- 2015-05-22 FR FR1554604A patent/FR3036432B1/fr active Active
-
2016
- 2016-05-12 JP JP2017560690A patent/JP6689290B2/ja active Active
- 2016-05-12 WO PCT/FR2016/051123 patent/WO2016189215A1/fr not_active Ceased
- 2016-05-12 CN CN201680032748.7A patent/CN107709708B/zh active Active
- 2016-05-12 EP EP16726365.6A patent/EP3298244B1/fr active Active
- 2016-05-12 US US15/576,014 patent/US10690007B2/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3819475A1 (fr) * | 2019-11-06 | 2021-05-12 | Raytheon Technologies Corporation | Agencement de joint d'air extérieur d'aube et procédé d'étanchéité |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3036432A1 (fr) | 2016-11-25 |
| WO2016189215A1 (fr) | 2016-12-01 |
| CN107709708A (zh) | 2018-02-16 |
| CN107709708B (zh) | 2020-04-28 |
| EP3298244B1 (fr) | 2020-11-11 |
| US20180156069A1 (en) | 2018-06-07 |
| JP2018519458A (ja) | 2018-07-19 |
| FR3036432B1 (fr) | 2019-04-19 |
| US10690007B2 (en) | 2020-06-23 |
| JP6689290B2 (ja) | 2020-04-28 |
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