PURPOSE: To realize two kinds of characteristics in which a gradient of a Q-H curve is made large in a small flow rate area and the gradient of the Q-H curve is made small in a large flow rate area.
CONSTITUTION: A movable blade drainage pump is provided with a movable blade impeller 1 having plural movable blades 5a pivoted by an inside hub 1b of a spherical surface shape hub housed in a casing, an unillustrated driving means composed of a driving shaft 3 of the movable blade impeller 1 and a driving source, an unillustrated control means to control rotation of the respective movable blades 5a and a stem shaft angle changing hydraulic mechanism (variable mechanism) 1f to change a stem shaft angle (α) created between a stem shaft 5b of the respective movable blades 5a and the driving shaft 3. Thereby, downsizing can be realized, and space of a drainage pump machine place can be reduced.
MARU SABURO
TAKADA KUNIO
