# US 12,215,593 B1 · Turbine shroud assembly with inter-segment damping > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,593 B1 - Document ID: US12215593B1 - Status: Granted - Kind: B1 - Application number: 18/678,892 - Filed: 2024-05-30 - Granted: 2025-02-04 - Earliest claimed: 2024-05-30 - Assignees: ROLLS-ROYCE plc - Applicants: Rolls-Royce Corporation - Inventors: David J. Thomas; Aaron D. Sippel; Ted J. Freeman; Clark J. Snyder - Web page: https://patentgrep.com/patent/US12215593B1 ## CPC - F01D 25/28: Supporting or mounting arrangements, e.g. for turbine casing - F01D 5/225: {by shrouding} - F01D 11/005: {Sealing means between non relatively rotating elements} - F01D 25/246: {Fastening of diaphragms or stator-rings} - F05D 2240/11: Shroud seal segments - F05D 2240/55: Seals - 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 ## Abstract A turbine shroud assembly includes a first shroud segment, a second shroud segment, and a seal assembly. The first shroud segment includes a first carrier segment arranged circumferentially at least partway around a central axis and a first blade track segment supported by the first carrier segment. The second shroud segment is arranged circumferentially adjacent the first shroud segment about the central axis. The seal assembly is configured to block gases from escaping the gas path radially between the first shroud segment and the second shroud segment. ## Claims ### Claim 1 A turbine shroud assembly for use with a gas turbine engine, the turbine shroud assembly comprising: a first shroud segment including a first carrier segment arranged circumferentially at least partway around a central axis and a first blade track segment supported by the first carrier segment to define a first portion of a gas path of the turbine shroud assembly, the first blade track segment having a first shroud wall that extends circumferentially partway around the central axis and a first attachment feature that extends radially outward from the first shroud wall, wherein the first shroud wall has a first radial outer surface and a first radial inner surface, a second shroud segment arranged circumferentially adjacent the first shroud segment about the central axis, the second shroud segment including a second carrier segment arranged circumferentially at least partway around the central axis and a second blade track segment supported by the second carrier segment to define a second portion of the gas path of the turbine shroud assembly, the second blade track segment having a second shroud wall that extends circumferentially partway around the central axis and a second attachment feature that extends radially outward from the second shroud wall, wherein the second shroud wall has a second radial outer surface and a second radial inner surface, and a seal assembly configured to block gases from escaping the gas path radially between the first shroud segment and the second shroud segment, the seal assembly including a strip seal and a damping coil, the strip seal having an axial segment that extends axially along the first radial outer surface of the first shroud wall and the second radial outer surface of the second shroud wall to block the gases from passing radially between and beyond the first shroud wall and the second shroud wall, and the damping coil arranged axially along the axial segment of the strip seal to apply a radial inward force to the axial segment of the strip seal so that the strip seal is urged radially inwardly to maintain engagement of the strip seal with the first shroud wall and the second shroud wall while allowing for radial misalignment of the first blade track segment relative to the second blade track segment during use of the turbine shroud assembly. ### Claim 2 (depends on 1) The turbine shroud assembly of claim 1, wherein the first carrier segment and the second carrier segment cooperate to define a coil-receiving space that opens radially inwardly and receives the damping coil therein. ### Claim 3 (depends on 1) The turbine shroud assembly of claim 1, wherein the first carrier segment includes a first outer wall, a first flange that extends radially inward from the first outer wall, a second flange axially spaced apart from the first flange and extending radially inward from the first outer wall, a third flange that extends radially inward from the first outer wall and is located axially between the first flange and the second flange, and a fourth flange that extends radially inward from the first outer wall and is located axially between the third flange and the second flange, and wherein the damping coil is located axially between the first flange of the first carrier segment and the third flange of the first carrier segment. ### Claim 4 (depends on 3) The turbine shroud assembly of claim 3, wherein the first carrier segment includes a radial inner surface that extends axially between the first flange of the first carrier segment and the third flange of the first carrier segment, and wherein the damping coil is located radially between the radial inner surface of the first carrier segment and the axial segment of the strip seal to engage each of the radial inner surface of the first carrier segment and the axial segment of the strip seal. ### Claim 5 (depends on 1) The turbine shroud assembly of claim 1, wherein the axial segment of the strip seal extends between a first end and second end thereof opposite the first end, and wherein the strip seal includes a forward radial segment that extends axially forward and radially outward from the first end of the axial segment into the first carrier segment and an aft radial segment that extends axially aft and radially outward from the second end of the axial segment. ### Claim 6 (depends on 5) The turbine shroud assembly of claim 5, wherein the first carrier segment includes a first outer wall, a first flange that extends radially inward from the first outer wall, a second flange axially spaced apart from the first flange and extending radially inward from the first outer wall, a third flange that extends radially inward from the first outer wall and is located axially between the first flange and the second flange, and a fourth flange that extends radially inward from the first outer wall and is located axially between the third flange and the second flange, and wherein the forward radial segment of the strip seal extends into the first flange of the first carrier segment, the aft radial segment of the strip seal is located axially aft of the second flange of the first carrier segment, and the damping coil is located axially between the first flange of the first carrier segment and the third flange of the first carrier segment. ### Claim 7 (depends on 5) The turbine shroud assembly of claim 5, wherein the forward radial segment of the strip seal extends axially forward and radially outward from the first end of the axial segment into a slot formed in the first carrier segment to axially locate the strip seal relative to the first carrier segment. ### Claim 8 (depends on 7) The turbine shroud assembly of claim 7, wherein the forward radial segment includes a first portion that extends along a curved path axially forward and radially outward from the first end of the axial segment and a second portion that extends radially outward from the first portion along a straight path. ### Claim 9 (depends on 5) The turbine shroud assembly of claim 5, wherein the aft radial segment of the strip seal is located axially aft of the first carrier segment and engages an aft wall of the first carrier segment to axially locate the strip seal relative to the first carrier segment. ### Claim 10 (depends on 9) The turbine shroud assembly of claim 9, wherein the aft radial segment includes a first portion that extends along a curved path axially aft and radially outward from the second end of the axial segment and a second portion that extends radially outward from the first portion along a straight path. ### Claim 11 (depends on 1) The turbine shroud assembly of claim 1, wherein the first attachment feature of the first blade track segment includes a first attachment flange that extends radially outward from the first shroud wall and a second attachment flange that extends radially outward from the first shroud wall and axially spaced apart from the first attachment flange, and wherein the second attachment feature of the second blade track segment includes a third attachment flange that extends radially outward from the second shroud wall and a fourth attachment flange that extends radially outward from the second shroud wall and axially spaced apart from the third attachment flange, and wherein the damping coil is located circumferentially between the first attachment flange of the first blade track segment and the third attachment flange of the second blade track segment. ### Claim 12 A turbine shroud assembly for use with a gas turbine engine, the turbine shroud assembly comprising: a first shroud segment including a first carrier segment arranged circumferentially at least partway around a central axis and a first blade track segment supported by the first carrier segment to define a first portion of a gas path of the turbine shroud assembly, the first blade track segment having a first shroud wall that extends circumferentially partway around the central axis and a first attachment feature that extends radially outward from the first shroud wall, a second shroud segment arranged circumferentially adjacent the first shroud segment about the central axis, the second shroud segment including a second carrier segment arranged circumferentially at least partway around the central axis and a second blade track segment supported by the second carrier segment to define a second portion of the gas path of the turbine shroud assembly, the second blade track segment having a second shroud wall that extends circumferentially partway around the central axis and a second attachment feature that extends radially outward from the second shroud wall, and a seal assembly configured to block gases from escaping the gas path radially between the first shroud segment and the second shroud segment, the seal assembly including a strip seal and a damping coil, the strip seal extending axially along the first shroud wall and the second shroud wall, and the damping coil arranged along the strip seal to apply a radial inward force to the strip seal so that the strip seal is urged radially inwardly to maintain engagement of the strip seal with the first shroud wall and the second shroud wall. ### Claim 13 (depends on 12) The turbine shroud assembly of claim 12, wherein the first carrier segment includes a first outer wall, a first flange that extends radially inward from the first outer wall, a second flange axially spaced apart from the first flange and extending radially inward from the first outer wall, a third flange that extends radially inward from the first outer wall and is located axially between the first flange and the second flange, and a fourth flange that extends radially inward from the first outer wall and is located axially between the third flange and the second flange, and wherein the damping coil is located axially between the first flange of the first carrier segment and the third flange of the first carrier segment. ### Claim 14 (depends on 13) The turbine shroud assembly of claim 13, wherein the first carrier segment includes a radial inner surface that extends axially between the first flange of the first carrier segment and the third flange of the first carrier segment, and wherein the damping coil is located radially between the radial inner surface of the first carrier segment and the strip seal to engage each of the radial inner surface of the first carrier segment and the strip seal. ### Claim 15 (depends on 13) The turbine shroud assembly of claim 13, wherein the strip seal includes an axial segment that extends axially along the first shroud wall and the second shroud wall between a first end and a second end thereof opposite the first end, a forward radial segment that extends axially forward and radially outward from the first end of the axial segment into the first flange of the first carrier segment, and an aft radial segment that extends axially aft and radially outward from the second end of the axial segment, and wherein the aft radial segment of the strip seal is located axially aft of the second flange of the first carrier segment. ### Claim 16 (depends on 15) The turbine shroud assembly of claim 15, wherein the damping coil extends axially along the axial segment of the strip seal to apply the radial inward force to the axial segment of the strip seal so that the axial segment of the strip seal engages each of the first shroud wall and the second shroud wall. ### Claim 17 (depends on 12) The turbine shroud assembly of claim 12, wherein the first attachment feature of the first blade track segment includes a first attachment flange that extends radially outward from the first shroud wall and a second attachment flange that extends radially outward from the first shroud wall and axially spaced apart from the first attachment flange, and wherein the second attachment feature of the second blade track segment includes a third attachment flange that extends radially outward from the second shroud wall and a fourth attachment flange that extends radially outward from the second shroud wall and axially spaced apart from the third attachment flange, and wherein the damping coil is located circumferentially between the first attachment flange of the first blade track segment and the third attachment flange of the second blade track segment. ### Claim 18 A method of assembling a turbine shroud assembly for use with a gas turbine engine comprising: assembling a first shroud segment by coupling a first blade track segment with a first carrier segment to support the first blade track segment radially inward of the first carrier segment, assembling a second shroud segment by coupling a second blade track segment with a second carrier segment to support the second blade track segment radially inward of the second carrier segment, locating a strip seal on a first radial outer surface of the first blade track segment and a second radial outer surface of the second blade track segment, locating a damping coil radially between the first carrier segment and the strip seal so that the damping coil engages the first carrier segment and the strip seal, and applying a radial inward force to the strip seal with the damping coil to maintain engagement of the strip seal with the first radial outer surface of the first blade track segment and the second radial outer surface of the second blade track segment in response to radial misalignment of the first blade track segment relative to the second blade track segment. ### Claim 19 (depends on 18) The method of claim 18, wherein the step of applying a radial inward force includes applying the radial inward force along a centerline of the strip seal located between circumferential ends of the strip seal. ### Claim 20 (depends on 18) The method of claim 18, wherein the step of locating a strip seal includes locating a forward radial segment of the strip seal in a slot formed in a first flange of the first carrier segment and locating an aft radial segment of the strip seal axially aft of the first carrier segment.