# US 2018/0024599 A1 · Liquid-type cooling apparatus and manufacturing method for heat radiation fin in liquid-type cooling apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024599 A1 - Document ID: US20180024599A1 - Status: Published application - Kind: A1 - Application number: 15/546,721 - Filed: 2015-06-03 - Published: 2018-01-25 - Earliest claimed: 2015-06-03 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Kazuki SAKATA; Masasi SAKAI; Masayosi TAMURA; Seiji HAGA - Web page: https://patentgrep.com/patent/US20180024599A1 ## CPC - F28F 3/12: Elements constructed in the shape of a hollow panel, e.g. with channels {(F28D1/02, F28D1/03 take precedence)} - G06F 1/20: Cooling means - F28F 3/022: {the means being wires or pins} - F28F 3/06: the means being attachable to the element - F28F 13/08: by varying the cross-section of the flow channels - H05K 7/20254: {Cold plates transferring heat from heat source to coolant} - H05K 7/2039: {characterised by the heat transfer by conduction from the heat generating element to a dissipating body (arrangements for increasing/decreasing heat-transfer, e.g. fins details, F28F13/00)} - H10W 40/47: by flowing liquids, e.g. forced water cooling - H10W 70/027: {Mechanical treatments, e.g. deforming, punching or cutting} - G06F 2200/201: Cooling arrangements using cooling fluid - H10W 40/258: {Metallic materials (H10W40/254, H10W40/257, H10W40/255, H10W40/251, H10W40/253 take precedence)} - H10W 40/259: {Ceramics or glasses (H10W40/254, H10W40/257, H10W40/255, H10W40/251, H10W40/253 take precedence)} - H10W 70/692: Ceramics or glasses - H10W 90/00: Package configurations - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract There is provided a heat sink in which the thermal resistance from a portion where the heat sink directly or indirectly makes contact with a heat-generating device to a portion where the heat sink makes contact with a coolant is set to be a value that is different from the thermal resistance at a different position in the flowing direction of the coolant, so that it is made possible to suppress the temperature difference between the upstream end and the downstream end of the heat-generating device. ## Claims ### Claim at position 1 1-12. (canceled) ### Claim 13 A liquid-type cooling apparatus in which there are provided a jacket including a coolant path through which a coolant flows and a heat sink that directly or indirectly makes contact with at least one heat-generating device and makes contact with the coolant flowing in the jacket and in which heat generated by the heat-generating device is transferred to the coolant through the intermediary of the heat sink so that the heat is radiated, wherein in the heat sink, the thermal resistance from a portion where the heat sink directly or indirectly makes contact with the heat-generating device to a portion where the heat sink makes contact with the coolant is set to be a value that is different from the thermal resistance at a different position in the flowing direction of the coolant. ### Claim 14 (depends on 13) The liquid-type cooling apparatus according to claim 13, wherein the value of the thermal resistance of the heat sink is set in such a way as to decrease toward the downstream side of the coolant flowing in the jacket. ### Claim 15 (depends on 14) The liquid-type cooling apparatus according to claim 14, wherein the value of the thermal resistance of the heat sink is reduced by decreasing the cross-sectional area of the coolant path in a direction perpendicular to the flowing direction of the coolant. ### Claim 16 (depends on 15) The liquid-type cooling apparatus according to claim 15, wherein the heat sink has a plurality of heat radiation fins that each make contact with the coolant, and wherein the cross-sectional area of the coolant path is reduced by increasing the lengths of the plurality of heat radiation fins in a direction perpendicular to the flowing direction of the coolant. ### Claim 17 (depends on 15) The liquid-type cooling apparatus according to claim 15, wherein the heat sink has a plurality of heat radiation fins that each make contact with the coolant, and wherein the cross-sectional area of the coolant path is reduced by increasing the number of the heat radiation fins arranged in the unit area of the coolant path. ### Claim 18 (depends on 15) The liquid-type cooling apparatus according to claim 15, wherein the heat sink has a plurality of heat radiation fins that each make contact with the coolant, and wherein the cross-sectional area of the coolant path is reduced by increasing the volume of each of the heat radiation fins. ### Claim 19 (depends on 13) The liquid-type cooling apparatus according to claim 13, wherein a plurality of the heat-generating devices are provided, wherein the heat sink directly or indirectly makes contact with the respective heat-generating devices at different positions in the flowing direction of the coolant, and wherein the thermal resistances at the different positions of the heat sink are set to respective different values in accordance with cooling priorities of the plurality of heat-generating devices. ### Claim 20 A liquid-type cooling apparatus in which there are provided a jacket through which a coolant flows and a heat sink that makes contact with the coolant flowing in the jacket and in which heat generated by a heat-generating device is transferred to the coolant through the intermediary of the heat sink so that the heat is radiated, wherein the heat sink includes a heat sink base member having a first surface portion that faces the inside of the jacket and a plurality of heat radiation fins that are provided on the first surface portion of the heat sink base member and make contact with the coolant flowing in the jacket, and wherein the plurality of heat radiation fins are inclined toward the downstream side of the coolant flowing in the jacket. ### Claim 21 (depends on 20) The liquid-type cooling apparatus according to claim 20, wherein the heat radiation fin is formed of a triangular prism, a quadrangular prism, or a hexagonal prism, and wherein a side face of the heat radiation fin is parallel to the corresponding side face of another heat radiation fin that is adjacent to said heat radiation fin. ### Claim 22 (depends on 20) The liquid-type cooling apparatus according to claim 20, wherein the heat radiation fin includes an inclination portion that makes contact with the first surface portion of the heat sink base member and is inclined toward the downstream side of the coolant flowing in the jacket and an erect portion that stands erect from the inclination portion with respect to the first surface portion. ### Claim 23 (depends on 21) The liquid-type cooling apparatus according to claim 21, wherein the heat radiation fin includes an inclination portion that makes contact with the first surface portion of the heat sink base member and is inclined toward the downstream side of the coolant flowing in the jacket and an erect portion that stands erect from the inclination portion with respect to the first surface portion. ### Claim 24 (depends on 20) A manufacturing method for heat radiation fins in the liquid-type cooling apparatus according to claim 20, wherein on the first surface portion of the heat sink base member, a plate-shaped heat radiation fin region protruding by a predetermined dimension from the first surface portion is formed, and wherein a plurality of circular blades that are arranged in such a way as to be spaced a predetermined distance away from one another and whose diameters are different from one another are rotated and then the plurality of circular blades concurrently cut the heat radiation fin region at an inclination angle with respect to the first surface portion so that the plurality of heat radiation fins are formed. ### Claim 25 (depends on 21) A manufacturing method for heat radiation fins in the liquid-type cooling apparatus according to claim 21, wherein on the first surface portion of the heat sink base member, a plate-shaped heat radiation fin region protruding by a predetermined dimension from the first surface portion is formed, and wherein a plurality of circular blades that are arranged in such a way as to be spaced a predetermined distance away from one another and whose diameters are different from one another are rotated and then the plurality of circular blades concurrently cut the heat radiation fin region at an inclination angle with respect to the first surface portion so that the plurality of heat radiation fins are formed. ### Claim 26 (depends on 22) A manufacturing method for heat radiation fins in the liquid-type cooling apparatus according to claim 22, wherein on the first surface portion of the heat sink base member, there are formed a plurality of protruding threads that are arranged in parallel with one another and that each protrude by a predetermined dimension from the first surface portion, wherein each of the plurality of protruding threads includes an inclined protruding thread portion that is provided in such a way as to make contact with the first surface portion and is inclined toward a predetermined direction with respect to the first surface portion and an erect protruding thread portion that is provided in such a way as to make contact with the inclined protruding thread portion and stands erect with respect to the first surface portion, and wherein the plurality of heat radiation fins are formed through cutting processing of the plurality of protruding threads. ### Claim 27 (depends on 23) A manufacturing method for heat radiation fins in the liquid-type cooling apparatus according to claim 23, wherein on the first surface portion of the heat sink base member, there are formed a plurality of protruding threads that are arranged in parallel with one another and that each protrude by a predetermined dimension from the first surface portion, wherein each of the plurality of protruding threads includes an inclined protruding thread portion that is provided in such a way as to make contact with the first surface portion and is inclined toward a predetermined direction with respect to the first surface portion and an erect protruding thread portion that is provided in such a way as to make contact with the inclined protruding thread portion and stands erect with respect to the first surface portion, and wherein the plurality of heat radiation fins are formed through cutting processing of the plurality of protruding threads.