| 摘要 |
PROBLEM TO BE SOLVED: To provide an installing structure which causes no backlash or no displacement of the center even if it is user unded a large temperature fluctuation condition and requires no much labor for production. SOLUTION: In an installation structure, by which a ceramic impeller 12 provided with a blade plate 17 integrally formed on the outer circumferential face of a shaft part 18 is installed at the tip of a rotary shaft 5, for a ceramic impeller, a metallic cylinder body 16 is installed on the top side of the rotary shaft 5 concentrically with the rotary shaft 5, while the ceramic impeller 12 is fixed in the inside of the cylinder body 16 when the outer circumference of the blade plate 17 is brought into contact with the cylinder body 16 so as to be shrinkage fitted to it. |
