# US 8,274,351 B2 · Transformer device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,274,351 B2 - Document ID: US8274351B2 - Status: Granted - Kind: B2 - Application number: 13/128,063 - Filed: 2008-12-25 - Published: 2011-08-25 - Granted: 2012-09-25 - Earliest claimed: 2008-12-25 - Assignees: Mitsubishi Electric Corporation - Inventors: Hiroshi Kiuchi; Koji Kise; Toshihiro Noda - Web page: https://patentgrep.com/patent/US8274351B2 ## CPC - H01F 27/2876: {Cooling (cooling transformers and inductances in general H01F27/08)} - H01F 27/12: Oil cooling - H01F 27/2871: {Pancake coils} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A transformer device includes an iron core, a plurality of stacked coils, wound onto the iron core, a plurality of base members arranged between the plurality of coils adjacent in a stacking direction, a plurality of flow channel member groups provided for each of the coils, each provided at a corresponding base member, and forming a flow channel directed to a flow of an insulating liquid between the corresponding base member and a corresponding coil, and an obstruction member arranged to obstruct the flow of the insulating liquid such that at least one of the flow channels formed by the plurality of flow channel member groups differs in the flow volume of the insulating liquid from another of the flow channels, and to obstruct the flow of the insulating liquid at a region not overlapping with the iron core in the flowing direction of the insulating liquid, among the flow channels. ## Claims ### Claim 1 A transformer device comprising: an iron core; a plurality of coils wound onto said iron core and stacked with each other; a plurality of base members arranged corresponding to said plurality of coils, respectively; a plurality of flow channel member groups provided for said plurality of base members, respectively, and each forming a flow channel directed to a flow of an insulating fluid between a corresponding base member and a corresponding coil; and an obstruction member arranged to obstruct the flow of said insulating fluid such that at least one of the flow channels formed by said plurality of flow channel member groups differs in a flow volume of said insulating fluid from another of said flow channels, and to obstruct the flow of said insulating fluid at a region not overlapping with said iron core in a flowing direction of said insulating fluid among regions of said at least one of the flow channels, wherein said channel flow member group includes a plurality of first flow channel members of a rectangular shape, provided extensively at an inlet side and outlet side of said flow channels, each having two long sides along the flowing direction of said insulating fluid, and two shorter sides substantially perpendicular to the flowing direction of said insulating fluid, and a plurality of second flow channel members of a rectangular shape, provided extensively between the inlet side and outlet side of said flow channels, each having two long sides substantially perpendicular to the flowing direction of said insulating fluid and two shorter sides along the flowing direction of said insulating fluid, and said obstruction member provided at least one of the inlet side and outlet side of said flow channels, and having a portion in a direction substantially perpendicular to the flowing direction of said insulating fluid longer than a length of the two shorter sides of said first flow channel member. ### Claim 2 (depends on 1) The transformer device according to claim 1, wherein said obstruction member is arranged to obstruct the flow of said insulating fluid at an inlet side region of said at least one of the flow channels, not overlapping with said iron core in the flowing direction of said insulating fluid. ### Claim 3 (depends on 1) The transformer device according to claim 1, wherein said obstruction member is arranged to obstruct the flow of said insulating fluid at an outlet side region of said at least one of the flow channels, not overlapping with said iron core in the flowing direction of said insulating fluid. ### Claim 4 (depends on 1) The transformer device according to claim 1, wherein said obstruction member has a T shape or an L shape. ### Claim 5 (depends on 1) The transformer device according to claim 1, wherein said plurality of coils include a low-voltage coil and a high-voltage coil, said at least one of the flow channels corresponds to said low-voltage coil. ### Claim 6 (depends on 1) The transformer device according to claim 1, wherein said plurality of coils include a low-voltage coil and a high-voltage coil, said transformer device including an AC mode in which externally applied AC voltage is supplied to said high-voltage coil, and AC voltage is induced at said low-voltage coil by the AC voltage supplied to said high-voltage coil, and a DC mode in which externally applied DC voltage is supplied to said low-voltage coil, wherein said obstruction member is provided at a position obstructing the flow of said insulating fluid such that a temperature of said high-voltage coil and said low-voltage coil in said AC mode and said DC mode is lower than a predetermined value. ### Claim 7 (depends on 1) The transformer device according to claim 1, further comprising: a tank filled with said insulating fluid and containing said plurality of coils, said iron core, said base members, said plurality of flow channel member groups and said obstruction member to immerse said plurality of coils, said iron core, said plurality of base members, said plurality of flow channel member groups and said obstruction member in said insulating fluid; a cooler cooling said insulating fluid; and a pump circulating said insulating fluid between said tank and said cooler. ### Claim 8 (depends on 1) The transformer device according to claim 1, wherein said iron core includes at least two openings, and said plurality of coils are wound passing through each of said openings so as to be penetrated by a portion of said iron core located between each of said openings, and stacked in said penetrating direction. ### Claim 9 (depends on 1) The transformer device according to claim 1, wherein said obstruction member is provided at at least one of said plurality of base members. ### Claim 10 A transformer device comprising: an iron core including at least two openings; a plurality of coils wound passing through each of said openings so as to be penetrated by a portion of said the iron core located between each of said openings, and stacked in said penetrating direction; a plurality of base members arranged corresponding to said plurality of coils, respectively; a plurality of flow channel member groups provided for said plurality of base members, respectively, and each forming a flow channel directed to a flow of an insulating fluid between a corresponding base member and a corresponding coil; and an obstruction member arranged to obstruct the flow of said insulating fluid such that at least one of the flow channels formed by said plurality of flow channel member groups differs in a flow volume of said insulating fluid from another of said flow channels, wherein said channel flow member group includes a plurality of first flow channel members of a rectangular shape, provided extensively at an inlet side and outlet side of said flow channels, each having two long sides along the flowing direction of said insulating fluid, and two shorter sides substantially perpendicular to the flowing direction of said insulating fluid, and a plurality of second flow channel members of a rectangular shape, provided extensively between the inlet side and outlet side of said flow channels, each having two long sides substantially perpendicular to the flowing direction of said insulating fluid and two shorter sides along the flowing direction of said insulating fluid, and said obstruction member provided at least one of the inlet side and outlet side of said at least one of the flow channels, and having a portion in a direction substantially perpendicular to the flowing direction of said insulating fluid longer than a length of the two shorter sides of said first flow channel member.