| 摘要 |
PROBLEM TO BE SOLVED: To enlarge a cooling waterway cross section and to reduce pressure loss of cooling water inside a heat radiator. SOLUTION: In the heat radiator 1, an upper heatsink 2, an intermediate heatsink 3 and a lower heatsink 4, whose one side end is set to be a heat reception end, are laminated in upper and lower three layers. A drain hole 5 is disposed on the other end of the lower heatsink 4. A water supply hole 6 is arranged between the drain hole 5 and the heat reception end. A lower waterway 7 reaching the heat reception end from the water supply hole 6 is formed on an upper face in a groove shape. A heating element 15 is cooled by cooling water flowing from the water supply hole 6 of the lower heatsink 4 to the drain hole 9 of the intermediate heatsink 3 and the drain hole 5 of the lower heatsink 4 through the lower waterway 7, the connection hole 10 of the intermediate heatsink 3, and an upper waterway 12 of the upper heatsink 2. A bypass waterway 19 is formed on an upper face of the lower heatsink 4 in the groove shape. A bypass hole 20 connecting the bypass waterway 19 and the upper waterway 2 is disposed in the intermediate heatsink 3. A part of cooling water flowing into the upper waterway 2 from the lower waterway 7 is made to flow to the drain hole 5 through the bypass waterway 19. COPYRIGHT: (C)2006,JPO&NCIPI |
