Patent ID: 6511306
Filing Date: 2003-01-28
Classification: F01B,F04B,Y10T

Abstract:
A positive fluid displacement device (PFDD) for delivering a fluid comprisinga housing for said device; a crankshaft mounted within said housing, said crankshaft for coupling to the driveshaft of a motor; a crankpin connected to said crankshaft to provide an orbital movement around said crankshaft; a fluid displacement module (FDM) for quick and easy assembly with said housing and said crankpin, said FDM having a first piston/cylinder assembly comprising a single piece double-ended piston connected in assembly to said crankpin to operably provide said piston with a circular motion, said piston having a piston head on each end; two cylinders, each cylinder having a cylinder head, each cylinder head having a side which in assembly encloses one end of an associated displacement chamber, each said cylinder for holding one end of said piston and one piston head, each said piston head in assembly encloses a second end of the associated displacement chamber; each said cylinder head having a flat surface on a side opposite to the side enclosing the associated displacement chamber; and an opening in said cylinder head, said opening allowing fluid communication to and from the associated displacement chamber, said piston head having a protrusion sized to empty said opening at top dead center of piston travel; two port plates each having a flat surface which in assembly is in sealing engagement with a mating flat surface of the associated cylinder head, each said port plate having two ports for fluid communication through said opening to the associated displacement chamber, one port being an inlet port to the displacement chamber and one port being an outlet port from the displacement chamber, in assembly said housing and each said port plate are held apart from direct mechanical contact by interposing pliable members to bear against said housing and each said port plate thereby allowing micromotion of each said port plate in two dimensions while allowing movement of each said port plate in one dimension to enable continuous direct sealing engagement between the flat surface of each said port plate with the mating flat surface of the associated cylinder head; and wherein in operation, the circular movement of said piston imparts a reciprocating movement to each said cylinder, the flat surface of the associated cylinder head moving back and forth across the flat surface of the associated port plate once per revolution of said crankpin wherein the associated opening is successively brought into fluid communication with the associated inlet port and outlet port.