| 摘要 |
PROBLEM TO BE SOLVED: To secure an electric insulation resistance of a liquid which flows a flow path without lengthening a length of the flow path, and reducing a cross-section area in which current flows by thinning the flow path section. SOLUTION: Two or more bladed wheels 15, 15 having two or more blades 15a, 15a, and so on, used as a liquid sending part, which rotates by a liquid pressure, are prepared in the above primary side cooling liquid circulation path 4, to secure the electric insulation resistance of the liquid flowing in the flow path, which is electrically conductive. An interval at inside 14a of a revolving body accommodating part 14 of the primary side cooling liquid circulation path 4, which accommodates the above blades 15, 15 in rotating free, and the tips of two or more above blades 15, 15, is set as the interval holding the electric insulation of the cooling liquid, and the above revolving body accommodation part 14, which accommodates the above bladed wheels 15, 15, and the bladed wheels 15, 15, is constituted with a material having high electric insulation resistance. |
