An impeller pump with thermostatically adjustable guide vanes is suitable for
use as an automotive coolant pump. The pump is driven by a constant speed electric
motor, and flow variation is controlled by varying the orientation of the vanes.
Orientation of the vanes is effected by a wax-type thermostat, which senses coolant
temperature: flow is increased when the coolant is hot, and decreased as the coolant
cools. The variable guide vanes are mounted for pivoting about radial axes, and
are located just upstream from the pump impeller.
