| 摘要 |
PROBLEM TO BE SOLVED: To solve problems such as clogging and a low efficiency by arranging a front edge of an impeller in a plane surface which is perpendicular to an impeller axis, and extendedly arranging a supplying groove from an inlet to an outlet in a pump housing wall part on a surface opposed to the impeller while drawing a curve in an impeller rotational direction. SOLUTION: A front edge 6 of one or a plurality of impellers 5 is arranged on an upstream side of a pump housing 1, namely, it is arranged in a plane surface which is perpendicular a rotary shaft Z of an impeller 3 in a cylindrical inlet 2. One or many cutout parts, namely, a groove 8 extends along a surface 7 opposed to the impeller 3 on a wall part of the pump housing 1, namely, it is arranged extendedly from the cylindrical inlet 2 to the surface 7. The groove 8 is moved together with the front edge 6 of the impeller 5 so as to send a contaminant in an outlet direction. |
