IMPELLER FOR MIXED FLOW PUMP

摘要

PURPOSE:To enable to decrease the maximum diameter of guide vanes without lowering the efficiency of the guide vanes, by minimizing separation of flow from the hub surface just on the downstream side of the inlet of the guide vanes by shaping the impeller hub and the guide vane hub to have a smooth configuration and a large radius of curvature. CONSTITUTION:The centers of the radius of curvature Rs2, Rh2 of the walls if a fluid passage at the outlet of an impeller are located on the side of the axis of the impeller. The wall surface of the hub is shaped in a convex form while the wall surface of the shroud is shaped in a concave or linear form. Therefore, separation of fluid flow from the hub surface at the inlet of guide vanes is minimized although the radius of curvature of the hub surface is large and the radius of curvature of the hub can be made large, so that it is enabled to reduce the loss of the guide vanes and to decrease the outer diameter of a pump.