Patent ID: 9188005
Filing Date: 2015-11-17
Classification: F01C,F04C,F05C

Abstract:
1. A vane pump assembly for a fluid pump for pumping water and water-based fluids, said pump assembly comprising: a pump housing having a proximate portion and a distal portion, wherein the proximate portion of the housing is adapted to be mounted to a pump motor; a fluid inlet port in the distal portion of the housing; a fluid outlet port in the proximate portion of the pump housing; a distal bearing member disposed within the pump housing, the distal bearing member having a first side and a second side, a cavity formed in the second side of the distal bearing member, and a plurality of inlet orifices in fluid flow communication with the fluid inlet port; a first cam ring disposed within the pump housing adjacent the distal bearing member, the first cam ring having an elliptical interior opening; a metal rotor adapted to be mounted to a pump drive shaft and disposed within the opening in the first cam ring, the rotor having a first side and a second side, a cavity in the first side of the rotor, and a plurality of radial slots; a plurality of vanes slidably received within the slots of the rotor; a second cam ring comprising a polymeric material and having an elliptical shape and being disposed in the cavities formed in the distal bearing member second side and the rotor first side; and a proximate bearing member disposed within the pump housing adjacent the first cam ring, the proximate bearing member having a plurality of outlet orifices in fluid flow communication with the fluid outlet port; wherein rotation of the rotor causes fluids from the fluid inlet port to be drawn through the plurality of inlet orifices at an initial fluid pressure, to be directed along a plurality of fluid flow paths disposed between an inner surface of the first cam ring and an outer surface of the rotor, and to be ejected through the plurality of outlet orifices to the fluid outlet port at a second fluid pressure which is greater than the initial fluid pressure and wherein the pump housing comprises a molded polymeric material with unmachined molded surfaces.