Patent ID: 7905712

Claim:
A centrifugal pump device adapted for use with a heat-dissipating system, said centrifugal pump device comprising: a motor unit including a motor housing unit, at least two elongated flat stator cores disposed in said motor housing unit and spaced apart from each other, a rotor disposed rotatably in said motor housing unit between said stator cores and rotatable about a rotating axis, and at least two stator windings wound respectively on said stator cores, each of said stator cores extending in a direction perpendicular to and spaced apart from said rotating axis, each of said stator cores cooperating with a corresponding one of said stator windings to constitute a stator unit, each of said stator units having an inner side proximate to said rotor, an outer side distal from said rotor, and opposite first and second lateral sides interconnecting said inner and outer sides, said stator units cooperating with an imaginary first line extending through said first sides and an imaginary second line extending through said second sides to define a between-stator region thereamong; and a pump unit including: a pump chamber formed in said motor housing unit of said motor unit, a plurality of impeller blades disposed in said pump chamber and anchored to said rotor; wherein said rotor, impeller blades and pump chamber are substantially located wholly within said between-stator region, a pump housing unit attached fixedly and sealingly to said motor housing unit, a liquid passage formed in an assembly of said pump housing unit and said motor housing unit and in fluid communication with said pump chamber; an inlet passage formed in said motor housing unit and in fluid communication with said liquid passage, said inlet passage being adapted to allow liquid to flow into said liquid passage therethrough, said rotor and said impeller blades being rotatable to force the liquid to flow from said liquid passage into said pump chamber, and an outlet passage formed in said motor housing unit and in fluid communication with said pump chamber, said outlet passage being adapted to allow the liquid to flow out of said centrifugal pump device therethrough, at least a portion of said outlet passage extending into said between-stator region.