# US 10,370,982 B2 · Double shelf squealer tip with impingement cooling of serpentine cooled turbine blades > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,370,982 B2 - Document ID: US10370982B2 - Status: Granted - Kind: B2 - Application number: 15/424,755 - Filed: 2017-02-03 - Published: 2018-08-09 - Granted: 2019-08-06 - Earliest claimed: 2017-02-03 - Assignees: Doosan Heavy Industries Construction Co., Ltd - Applicants: Doosan Heavy Industries Construction Co., Ltd. - Inventors: Steven Roberts - Web page: https://patentgrep.com/patent/US10370982B2 ## CPC - F01D 5/187: {Convection cooling} - F01D 5/20: Specially-shaped blade tips to seal space between tips and stator {(F01D5/225 takes precedence)} - F05D 2240/307: related to the tip of a rotor blade - F05D 2260/201: by impingement of a fluid - 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 blade comprises a leading edge, a trailing edge, a squealer tip floor, and one or more walls arranged to form a cooling circuit within the turbine blade, the one or more walls forming an impingement shelf having one or more impingement holes through which coolant is expelled to cool the turbine blade. ## Claims ### Claim 1 A turbine blade comprising: a leading edge; a trailing edge disposed opposite to the leading edge; a squealer tip floor extending between the leading and trailing edges; and one or more walls arranged to form a cooling circuit within an airfoil of the turbine blade, the one or more walls forming an impingement shelf having a plurality of impingement holes through which coolant is expelled to cool the turbine blade, wherein the cooling circuit communicates with a trailing edge cavity formed by a turnaround section configured to guide the coolant to the plurality of impingement holes and to force the coolant through the impingement holes by blocking a flow of the coolant through the trailing edge, and wherein the plurality of impingement holes are arranged along a length of an upper side of the turnaround section. ### Claim 2 (depends on 1) The turbine blade of claim 1, wherein the squealer tip floor includes one or more vent holes through which the coolant expelled from the plurality of impingement holes are vented. ### Claim 3 (depends on 2) The turbine blade of claim 2, wherein each vent hole of the squealer tip floor and each impingement hole of the impingement shelf communicates with a median cavity interposed between the squealer tip floor and the impingement shelf, and wherein the median cavity does not communicate with the leading edge. ### Claim 4 (depends on 3) The turbine blade of claim 3, wherein the median cavity extends from the trailing edge by a length equal to a length of the impingement shelf. ### Claim 5 (depends on 4) The turbine blade of claim 4, wherein the impingement shelf forms an upper boundary of the cooling circuit. ### Claim 6 (depends on 1) The turbine blade of claim 1, wherein the turnaround section is formed at the trailing edge of the turbine blade. ### Claim 7 (depends on 1) The turbine blade of claim 1, wherein the impingement shelf and the squealer tip floor are parallel to each other. ### Claim 8 (depends on 1) The turbine blade of claim 1, wherein the one or more walls forming the cooling circuit include a plurality of walls extending into the cooling circuit from the trailing edge, the plurality of walls including one wall forming a bottom side of the trailing edge cavity disposed in opposition to a bottom surface of the impingement shelf. ### Claim 9 An impingement shelf of a turbine blade including a leading edge and a trailing edge disposed opposite to the leading edge, the impingement shelf extending between the leading and trailing edges and comprising: one or more walls arranged to form a serpentine cooling circuit within an airfoil of the turbine blade; and a plurality of impingement holes through which coolant is expelled to cool the turbine blade, the plurality of impingement holes communicating with the serpentine cooling circuit, wherein the serpentine cooling circuit communicates with a trailing edge cavity formed by a turnaround section configured to guide the coolant to the plurality of impingement holes and to force the coolant through the impingement holes by blocking a flow of the coolant through the trailing edge, and wherein the plurality of impingement holes are arranged along a length of an upper side of the turnaround section. ### Claim 10 (depends on 9) The impingement shelf of claim 9, wherein the turnaround section is formed at the trailing edge of the turbine blade. ### Claim 11 (depends on 9) The impingement shelf of claim 9, wherein the plurality of impingement holes are configured to direct the coolant expelled from the plurality of impingement holes to one or more vent holes formed on a squealer tip floor of the turbine blade. ### Claim 12 (depends on 11) The impingement shelf of claim 11, wherein the impingement shelf and the squealer tip floor are parallel to each other. ### Claim 13 (depends on 11) The impingement shelf of claim 11, wherein the plurality of impingement holes are configured to direct the coolant expelled from the plurality of impingement holes to one or more vent holes formed on the squealer tip floor. ### Claim 14 (depends on 13) The impingement shelf of claim 13, wherein each vent hole of the squealer tip floor and each impingement hole of the impingement shelf communicates with a median cavity interposed between the squealer tip floor and the impingement shelf, and wherein the median cavity does not communicate with the leading edge. ### Claim 15 (depends on 14) The impingement shelf of claim 14, wherein the median cavity extends from the trailing edge by a length equal to a length of the impingement shelf. ### Claim 16 (depends on 15) The impingement shelf of claim 15, wherein the impingement shelf forms an upper boundary of the serpentine cooling circuit. ### Claim 17 (depends on 9) The impingement shelf of claim 9, wherein the one or more walls forming the serpentine cooling circuit include a plurality of walls extending into the cooling circuit from the trailing edge, the plurality of walls including one wall forming a bottom side of the trailing edge cavity disposed in opposition to a bottom surface of the impingement shelf. ### Claim 18 A turbine blade comprising: an airfoil having a leading edge and a trailing edge and including a cooling circuit formed by one or more serpentine walls; a squealer tip floor extending between the leading and trailing edges; and an impingement shelf facing a portion of the squealer tip floor and having a plurality of impingement holes through which coolant is expelled to cool the turbine blade, wherein the cooling circuit communicates with a trailing edge cavity formed by a turnaround section configured to guide the coolant to the plurality of impingement holes and to force the coolant through the impingement holes by blocking a flow of the coolant through the trailing edge, and wherein the plurality of impingement holes are arranged along a length of an upper side of the turnaround section.