Patent ID: 6162030
Filing Date: 2000-12-19
Classification: F04B,F05C

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 comprisinga piston having a connecting end and a piston head, said connecting end connected to said crankpin to operably provide said piston with a circular motion;a cylinder having a cylinder head, said cylinder head having a side enclosing one end of a displacement chamber, said cylinder for holding said piston, said piston head enclosing a second end of said displacement chamber;said cylinder head having a flat surface on a side opposite to the side enclosing said displacement chamber; andan opening in said cylinder head, said opening allowing fluid communication to and from said displacement chamber, said piston head having a protrusion sized to fill said opening;a first port plate having a flat surface which in assembly is in sealing engagement with the flat surface of said cylinder head, said port plate having two ports for fluid communication through said opening to said displacement chamber, one port being an inlet port to said displacement chamber and one port being an outlet port from said displacement chamber, in assembly said housing acts to hold said port plate from any substantial movement in two dimensions while allowing movement in one dimension;a port plate spring located in assembly between said housing and said port plate to urge the flat surface of said port plate in said one dimension into sealing engagement with the flat surface of said cylinder head wherein said port plate is urged against said cylinder head in floating engagement therewith;wherein in operation, the circular movement of said crankpin imparts a reciprocating movement to said cylinder, the flat surface of said cylinder head moving back and forth across the flat surface of said port plate once per revolution of said crankpin wherein said opening is successively brought into fluid communication with said inlet port and said outlet port;said FDM having a second piston/cylinder assembly identical to said first piston/cylinder assembly, the second piston having a connecting end connected to said crankpin to provide an opposing piston/cylinder assembly; anda second port plate associated with said second piston/cylinder assembly, said second port plate identical to said first port plate.