# US 12,215,864 B2 · Combustion section with a casing shielding > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,864 B2 - Document ID: US12215864B2 - Status: Granted - Kind: B2 - Application number: 18/270,855 - Filed: 2021-10-12 - Published: 2024-09-12 - Granted: 2025-02-04 - Earliest claimed: 2021-01-25 - Assignees: Siemens Energy Global GmbH & Co. KG - Applicants: Siemens Energy Global GmbH & Co. KG - Inventors: Mikael Frejd; Johan Nilsson; Daniel Silfver - Web page: https://patentgrep.com/patent/US12215864B2 ## CPC - F23R 3/002: {Wall structures (F23R3/02 and F23R3/007 take precedence)} - F01D 25/145: {Thermally insulated casings} - F02C 7/12: Cooling of plants (of component parts, see the relevant subclasses, e.g. F01D; cooling of engines in general F01P) - F23R 3/02: characterised by the air-flow or gas-flow configuration (reverse- flow combustion chambers F23R3/54; cyclone or vortex type combustion chambers F23R3/58) - F23R 3/26: Controlling the air flow - F23R 3/46: Combustion chambers comprising an annular arrangement of {several essentially tubular} flame tubes within a common annular casing or within individual casings - F23R 3/50: Combustion chambers comprising an annular flame tube within an annular casing (toroidal combustion chambers F23R3/52) - F23R 3/60: Support structures; Attaching or mounting means - F05D 2240/15: Heat shield - F05D 2240/35: Combustors or associated equipment - F05D 2260/231: Preventing heat transfer - F23R: GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16) - 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 combustion section of a gas turbine includes an annular combustion chamber, a burner arrangement upstream of the combustion chamber, an annular compressor diffusor, and an annular combustion casing. The combustion casing has an outer section wall, an upstream section wall, and an inner section wall. The inner section wall extends along the rotor axis and is arranged between the burner arrangement and the compressor diffusor. A shielding is attached to the inner section wall at the side facing the rotor axis with a free space in-between at least. An outer diffusor wall of the compressor diffusor extends in axial direction up to the upstream half of the shielding. ## Claims ### Claim 1 An assembly for a gas turbine, the assembly comprising a rotor axis, a compressor section, and a combustion section, the combustion section comprising: an upstream side and a downstream side; an annular combustion, chamber; a burner arrangement upstream of the annular combustion, chamber; an annular compressor diffusor downstream of the compressor section and having an annular inner diffusor wall and an annular outer diffusor wall, the annular outer diffuser wall having a wall end at a downstream side of the annular outer diffusor wall; an annular combustion casing having an outer section wall extending along the rotor axis and arranged radially outward relative to the annular combustion chamber, an upstream section wall extending along a radial direction and arranged upstream relative to the annular combustion chamber, and an inner section wall extending along the rotor axis and arranged between the burner arrangement and the compressor diffusor, wherein the outer diffusor wall the inner section wall in an axial direction; and a shielding attached to the inner section wall on a radially inner side of the inner section wall facing the rotor axis, wherein a free space is defined between the shielding and the radially inner side of the inner section wall along at least half of an axial length of the inner section wall, wherein the wall end of the annular outer diffuser wall is arranged axially between an upstream end of the shielding and an axial midpoint of the shielding. ### Claim 2 (depends on 1) The assembly according to claim 1, wherein the upstream end of the shielding is axially spaced apart from the upstream section wall. ### Claim 3 (depends on 1) The assembly according to claim 1, wherein the inner section wall comprises a recess spaced apart from each of the upstream section wall and a downstream end of the inner section wall, wherein the recess is covered by the shielding. ### Claim 4 (depends on 3) The assembly according to claim 3, wherein the radially inner side of the inner section wall upstream and downstream of the shielding forms a continuous surface with a radially inner side of the shielding. ### Claim 5 (depends on 1) The assembly according to claim 1, wherein a free distance from the shielding to the radially inner side of the inner section wall is at least 0.1 times, and at most 0.3 times, a thickness from a radially outer side of the inner section wall to a radially inner side of the shielding. ### Claim 6 (depends on 5) The assembly according to claim 5, wherein the free distance is at least 0.15 and/or at most 0.2 times the thickness from the radially outer side of the inner section wall to the radially inner side of the shielding. ### Claim 7 (depends on 1) The assembly according to claim 1, wherein a free distance from the shielding to the radially inner side of the inner section wall is at least 0.5 times, and at most 1.5 times, a distance from the shielding to the outer diffuser wall. ### Claim 8 (depends on 7) The assembly according to claim 7, wherein the free distance is at least 0.7 times and/or at most 0.9 times the distance from the shielding to the outer diffuser wall. ### Claim 9 (depends on 1) The assembly according to claim 1, wherein an inner cover is attached on a radially outer side of the inner section wall, an inner gap defined between the inner cover and the radially outer side of the inner section wall. ### Claim 10 (depends on 9) The assembly according to claim 9, wherein the inner cover comprises a downstream end having a bend. ### Claim 11 (depends on 10) The assembly according to claim 10, wherein the bend is in contact with the inner section wall. ### Claim 12 (depends on 9) The assembly according to claim 9, wherein a width of the inner gap is at least 0.6 times, and at most 1.5 times, a free distance from the shielding to the radially inner side of the inner section wall. ### Claim 13 (depends on 12) The assembly according to claim 12, wherein the width of the inner gap is at least 0.8 times and/or at most 1.2 times the free distance. ### Claim 14 (depends on 1) The assembly according to claim 1, wherein an upstream cover is attached on a downstream side of the upstream section wall, an upstream gap defined between the upstream cover and the downstream side of the upstream section wall. ### Claim 15 (depends on 14) The assembly according to claim 14, wherein the upstream cover comprises a radially outer end having a bend. ### Claim 16 (depends on 15) The assembly according to claim 15, wherein the bend is in contact with the upstream section wall. ### Claim 17 (depends on 14) The assembly according to claim 14, wherein a width of the upstream gap is at least 0.6 times, and at most 1.5 times, a free distance from the shielding to the radially inner side of the inner section wall. ### Claim 18 (depends on 17) The assembly according to claim 17, wherein the width of the upstream gap is at least 0.8 times and/or at most 1.2 times the free distance. ### Claim 19 (depends on 14) The assembly according to claim 14, wherein an inner cover is attached on a radially outer side of the inner section wall, an inner gap defined between the inner cover and the radially outer side of the inner section wall, and wherein the inner cover is connected to the upstream cover, the inner gap and the upstream gap being connected to define a continuous gap.