# US 9,518,472 B2 · Turbine engine stator wheel and a turbine or a compressor including such a stator wheel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,472 B2 - Document ID: US9518472B2 - Status: Granted - Kind: B2 - Application number: 14/234,268 - Filed: 2012-07-18 - Published: 2014-05-29 - Granted: 2016-12-13 - Earliest claimed: 2011-07-22 - Assignees: Snecma; Herakles - Applicants: Olivier Belmonte; Antoine Jean-Philippe Beaujard - Inventors: Olivier Belmonte; Antoine Jean-Philippe Beaujard - Web page: https://patentgrep.com/patent/US9518472B2 ## CPC - F01D 9/04: forming ring or sector - F01D 9/042: {fixing blades to stators (fixing stator-rings in the casing or to each other F01D25/246)} - F01D 25/246: {Fastening of diaphragms or stator-rings} - F05D 2300/21: Oxide ceramics - F05D 2300/222: Silicon - F05D 2300/603: Composites; e.g. fibre-reinforced - F05D 2300/6033: Ceramic matrix composites [CMC] - Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A turbine nozzle comprises a plurality of composite material vanes, each vane comprising an inner platform, an outer platform with attachment tabs on the outside, and at least one airfoil extending between the inner and outer platforms and secured thereto. The attachment tabs of the vanes are engaged on a metal assembly ring supporting all of the vanes, extending continuously along the outer platforms of adjacent vanes, and forming a distinct assembly part between the vanes and a turbine casing. ## Claims ### Claim 1 A turbine engine stator wheel, comprising: a plurality of vanes each comprising an inner platform, an outer platform presenting attachment tabs on the outside, and at least one airfoil extending between the inner and outer platforms, the vane and the outer platform together with the attachment tab forming a single piece of ceramic matrix composite material or of organic matrix composite material; and a metal assembly ring in which the attachment tabs of the vanes are engaged, the metal ring supporting all of the vanes, extending continuously along the outer platforms of a plurality of adjacent vanes, and forming a distinct assembly part between the vanes and a casing. ### Claim 2 (depends on 1) The stator wheel according to claim 1, wherein the metal ring is made of sheet metal. ### Claim 3 (depends on 1) The stator wheel according to claim 1, wherein the metal ring presents frustoconical bearing surfaces contributing to holding the vanes radially and axially. ### Claim 4 (depends on 1) The stator wheel according to claim 1, wherein the metal ring has a section that is substantially Ω-shaped and outwardly open, having a web portion and flanges terminating in end portions forming hooks for attaching to a casing, and frustoconical bearing surfaces in contact with the attachment tabs of the vanes are situated on the outside faces of the flanges of the ring. ### Claim 5 (depends on 1) The stator wheel according to claim 1, wherein the outer platform of each vane presents a rib projecting outwards and coming into radial abutment against a surface portion of the metal ring. ### Claim 6 (depends on 1) The stator wheel according to claim 1, wherein the metal ring comprises a single piece and presents a vane insertion window. ### Claim 7 (depends on 6) The stator wheel according to claim 6, further comprising at least one latch for blocking in position a vane mounted at the level of the insertion window. ### Claim 8 (depends on 1) The stator wheel according to claim 1, wherein sealing wafers are arranged on the outer faces of the outer platforms of the vanes, each wafer covering at least part of a junction between the outer platforms of two adjacent vanes. ### Claim 9 (depends on 1) A turbine engine turbine, comprising: the stator wheel according to claim 1 forming a turbine nozzle, wherein the composite material is a ceramic matrix composite material, the turbine having a rotor wheel adjacent to the nozzle and comprising blades provided at their ends with wipers facing an abradable material supported by a ring, an additional metal ring being mounted between the abradable support ring and the outer platforms of the vanes of the nozzle, bearing thereagainst. ### Claim 10 (depends on 1) A turbine engine compressor, comprising: the stator wheel according to claim 1 forming a compressor diffuser, wherein the compressor has a rotor wheel adjacent to the diffuser and comprising blades provided at their ends with wipers facing an abradable material supported by a ring, and an additional metal ring is mounted between the abradable support ring and the outer platforms of the vanes of the diffuser, bearing thereagainst. ### Claim 11 (depends on 1) The stator wheel according to claim 1, wherein the vane and the outer platform together with the attachment tab form a single piece of ceramic matrix composite material. ### Claim 12 (depends on 11) The stator wheel according to claim 11, wherein said metal ring has bearing surfaces in contact with said ceramic matrix material of said attachment tab. ### Claim 13 (depends on 12) The stator wheel according to claim 12, wherein the vane and the outer platform together with the attachment tab are free of any metal. ### Claim 14 (depends on 1) The stator wheel according to claim 1, wherein the vane and the outer platform together with the attachment tab form a single piece of organic matrix composite material. ### Claim 15 (depends on 14) The stator wheel according to claim 14, wherein said metal ring has bearing surfaces in contact with said organic matrix composite material of said attachment tab. ### Claim 16 (depends on 15) The stator wheel according to claim 15, wherein the vane and the outer platform together with the attachment tab are free of any metal.