| 摘要 |
A magnetic coupling pump comprising an encapsulated-type impeller, and a casing for covering the impeller so that the impeller can rotate about a rotational axis and move in the direction of the axis that extends from the rotational axis, wherein the speed of the impeller is kept from decreasing even when thrust balance temporarily breaks down and the impeller and the casing come in contact with each other. Tapered surfaces (24), (55) are formed on at least a portion of surfaces (24), (53) of the impeller (10) and surfaces (66), (86) of the casing (60) facing each other in the axis direction (Da), so that the interval between the surfaces gradually changes progressively in the radial direction (Dr) perpendicular to the axis direction (Da). |
