Volumetric Pump With Reciprocated and Rotated Piston

Abstract

A volumetric pump ( 1 ) comprising a piston ( 2 ) and a cylindrical chamber ( 3 ), contains an inlet port ( 10 ) and an outlet port ( 11 ). The piston ( 2 ) is actuated by a rotor ( 5 ) bearing an eccentric shaft ( 6 ). The shaft ( 6 ), being connected to the piston ( 2 ), causes the piston to slide back and forth inside the cylinder chamber ( 3 ) while having a bidirectional angular movement. The instroke of the piston ( 2 ) sucks a fluid ( 15 ) from the inlet port ( 10 ) through a first channel ( 12 ) into the pump chamber ( 3 ), the fluid being propelled through a second channel ( 13 ) to the outlet port ( 11 ) during the outstroke of the piston ( 2 ). The inlet ( 10 ) and outlet port ( 11 ) are opened and closed alternatively by the bidirectional angular movement of the piston ( 2 ) which acts as a valve for the the inlet and outlet ports ( 10, 11 ).

1 . A volumetric pump comprising a piston in a cylindrical chamber, said chamber having an open upper end, an inlet port and an outlet port, said piston being actuable by at least one rotor to cause said piston to slide back and forth inside the cylinder chamber while having a bidirectional angular movement creating an instroke of the piston for sucking a fluid from the inlet port through a first channel into the pump chamber, followed by an outstroke of said piston for propelling the fluid through a second channel to the outlet port, the inlet and outlet port being opened and closed alternately by the bidirectional angular movement of said piston which acts as a valve for said inlet and outlet ports, the volumetric pump being, wherein a shaft is mounted eccentrically on the rotor and is operatively connected either directly to the piston, said shaft comprising a spherical extremity clipable into a receptable adjacent to the top part of said piston, or indirectly through a piston head adaptable to an end part of the piston, to cause said back and forth sliding of the piston. 
     
     
         2 . A volumetric pump as defined in  claim 1 , wherein the alternate opening and closing of said inlet and outlet ports are either in synchronization with the suction and expulsion phases of the volumetric pump or at anytime during the stroke of said piston. 
     
     
         3 . A volumetric pump as defined in  claim 2 , wherein said channels are curved to ensure a flow of the liquid alternately from the inlet port to the chamber during the instroke of the piston and from said chamber to the outlet during the outstroke of the outstroke of the piston. 
     
     
         4 . A volumetric pump as defined in  claim 1 , wherein said piston and cylindrical chamber are disposables. 
     
     
         5 . A volumetric pump as defined in  claim 1 , wherein several specific gaskets or standard O-rings are positioned around said inlet port and outlet port. 
     
     
         6 . A volumetric pump as defined in  claim 1 , wherein said piston and cylindrical chamber are injection moulded parts. 
     
     
         7 . A volumetric pump as defined in  claim 1 , wherein said shaft is mounted on a spring. 
     
     
         8 . A compressor comprising a tank that is sealed tight to the outlet port of a volumetric pump as defined in  claim 1 . 
     
     
         9 . Use of a volumetric pump as defined in  claim 1  as an enteral pump. 
     
     
         10 . Use of a volumetric pump as defined in  claim 1  as a parenteral pump.