# US 10,502,078 B2 · Gas turbine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,078 B2 - Document ID: US10502078B2 - Status: Granted - Kind: B2 - Application number: 15/842,195 - Filed: 2017-12-14 - Published: 2018-06-21 - Granted: 2019-12-10 - Earliest claimed: 2016-12-20 - Assignees: Doosan Heavy Industries Construction Co., Ltd - Applicants: Doosan Heavy Industries & Construction Co., Ltd - Inventors: Sung Chul Jung; Young Chan Yang - Web page: https://patentgrep.com/patent/US10502078B2 ## CPC - F01D 9/065: {Fluid supply or removal conduits traversing the working fluid flow, e.g. for lubrication-, cooling-, or sealing fluids (see also F01D25/16, F01D25/24 and F01D25/26)} - F01D 25/16: Arrangement of bearings; Supporting or mounting bearings in casings (bearings per se F16C) - F01D 25/162: {Bearing supports} - F01D 25/28: Supporting or mounting arrangements, e.g. for turbine casing - F02C 7/141: of working fluid - F01D 5/188: {with an insert in the blade cavity to guide the cooling fluid, e.g. forming a separation wall} - F05D 2260/213: by the provision of a heat exchanger within the cooling circuit - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A gas turbine includes a bearing housing surrounding an outside of a tie rod provided on the turbine. One end of a power strut is connected to an outside of the bearing housing, and the other end is radially arranged outwards. A cooling-air supply unit supplies cooling air to the power strut. A heat exchange unit is disposed in the power strut to perform a heat exchange process with cooling air supplied through the cooling-air supply unit. A ring-shaped support frame is connected to the other end of the power strut. ## Claims ### Claim 1 A gas turbine comprising: a support frame having an annular shape; a bearing housing concentrically disposed within the annular shape of the support frame and configured to at least partially surround a tie rod of the turbine; a power strut having an interior space in which cooling air flows and further including a first end coupled to an outside of the bearing housing and a second end radially arranged outwardly of the first end and coupled to an inside of the support frame; and a heat exchange unit formed as a plurality of ribs protruding from an inner wall of the power strut to be disposed in the interior space of the power strut and configured to perform a heat exchange between the inner wall and the cooling air, wherein each rib of the plurality of ribs protrudes a variable distance from the inner wall and includes a first end formed at a first radially disposed extreme of the rib and a second end formed at a second radially disposed extreme of the rib opposite the first end, the variable distance increasing gradually from the first end to the second end. ### Claim 2 (depends on 1) The gas turbine according to claim 1, wherein the plurality of ribs include: a first set of ribs formed on a first side of the inner wall; and a second set of ribs formed on a second side of the inner wall, the second side facing the first side, and wherein the plurality of ribs are arranged on the first and second sides of the inner wall such that each rib of the first set of ribs faces a corresponding rib of the second set of ribs. ### Claim 3 (depends on 1) The gas turbine according to claim 1, wherein the power strut is inclined at a predetermined gradient from the bearing housing to the support frame, and wherein the plurality of ribs extend from the bearing housing to the support frame in parallel with the predetermined gradient of the power strut. ### Claim 4 (depends on 1) The gas turbine according to claim 1, wherein the first end is disposed at an outwardly radial position with respect to the bearing housing and the second end is disposed at an inwardly radial position with respect to the bearing housing. ### Claim 5 (depends on 1) The gas turbine according to claim 1, further comprising a cover external to and at least partially surrounding the power strut. ### Claim 6 (depends on 5) The gas turbine according to claim 5, wherein a first cooling passage is provided between an outside of the power strut and an inside of the cover. ### Claim 7 (depends on 6) The gas turbine according to claim 6, wherein an opening is defined in the power strut operable to supply at least some of the cooling air supplied to the power strut to the first cooling passage. ### Claim 8 (depends on 7) The gas turbine according to claim 7, wherein the opening includes: first openings defined in respective side surfaces of the power strut when viewing a longitudinal cross-section of the power strut, and second openings defined below and spaced apart from the first openings. ### Claim 9 (depends on 8) The gas turbine according to claim 8, wherein each of the first openings includes an incline towards an upper portion of the cover, and each of the second openings includes an incline towards a lower portion of the cover. ### Claim 10 (depends on 8) The gas turbine according to claim 8, wherein a first junction disposed between the outside of the power strut and an inside of the support frame in the first cooling passage is configured to receive first air supplied through the first openings and direct the received first air towards second cooling passages that are defined, respectively, towards a front and rear axial positions of the tie rod, a second junction disposed between an inside of the power strut and an outside of an inner casing surrounding the outside of the bearing housing is configured to receive second air supplied through the first openings and direct the second received air to third cooling passages that are formed, respectively, towards the front and rear axial positions of the tie rod, and the first and second openings are operatively coupled to the second and third cooling passages, respectively, such that the cooling air supplied through the first and second openings is supplied to the second and third cooling passages. ### Claim 11 (depends on 10) The gas turbine according to claim 10, wherein a diameter of the first cooling passage is larger than a diameter of the second or third cooling passage. ### Claim 12 (depends on 10) The gas turbine according to claim 10, wherein an inner wall of the cover includes a guide configured to guide the cooling air passing through the first and second openings to the second and third cooling passages, respectively. ### Claim 13 (depends on 12) The gas turbine according to claim 12, wherein the guide includes: a horizontal part that includes a first end coupled to an inner wall of the cover and horizontally extends towards a center of the power strut, and a rounded part disposed at a second end of the horizontal part towards each of the second and third cooling passages. ### Claim 14 (depends on 10) The gas turbine according to claim 10, wherein the third cooling passage is configured such that cooling air supplied to the third cooling passage in an axial direction of a rotor presses the rotor towards a compressor of the turbine. ### Claim 15 (depends on 1) The gas turbine according to claim 1, wherein the cooling air includes high-pressure compressed air that is compressed in a compressor of the turbine.