| 摘要 |
PURPOSE:To improve various characteristics in a low relative speed centrifugal pump by a method wherein the configuration of a vane is determined so that there is a part, in which the diameter of an inscribed circle is inreasing, from the outlet to the inlet of a flow path, when the circle being inscribed with neighboring vanes is described in the flow path. CONSTITUTION:The flow path 12, extending spirally from the inside of the impeller to the outside thereof, is constituted by each other of the vanes 10 provided on the impeller 4. The configuration of the flow path 12 is determined so that the width f of the flow path at the after rim 13 of the vane is small and the width f is being increased toward the inside of the impeller, in order to make a load distribution at the before rim 11 side of the vane larger and the same at the after rim 13 side of the vane smaller. The bending configuration of the vane is determined so as to increase the diameters of the inscribed circles B1-B3 in the order of B1 B2 B3 when the inscribed circles B1-B3 are described within the neighboring vanes 10, therefore, the load distribution at the before end rim 11 of the vane becomes larger. |
