Reciprocating Pump

Abstract

A positive displacement pump can include a pump mechanism having a shaft configured to rotate about its long axis; a screw rod having a continuous thread around the circumference of the screw rod, the thread configured with an upward and downward thread component wherein the screw rod is operatively coupled to the shaft and reticulates along the long axis when the shaft is rotated about the long axis; a stylus positioned to engage the thread of the screw rod; cylindrical body forming a cavity configured to house at least a portion of the screw rod and allow movement of the screw rod along the long axis of the cylindrical body providing a pumping action in the cylindrical body cavity; an inlet and an outlet provided in the cylindrical body walls fluidly coupling the cylindrical body cavity with one or more external fluid paths.

1 . A positive displacement pump comprising a pump mechanism having:
 (i) a shaft configured to rotate about its long axis;   (ii) a screw rod having a continuous thread around the circumference of the screw rod, the thread configured to have an upward thread component and a downward thread component, wherein the screw rod is operatively coupled to the shaft and reticulates along the long axis when the shaft is rotated about the long axis;   (iii) a stylus positioned to project into the cavity and engage the thread of the screw rod;   (iv) cylindrical body forming a cavity configured to house at least a portion of the screw rod and allow movement of the screw rod along the long axis of the cylindrical body providing a pumping action in the cylindrical body cavity by expanding and displacing the volume of the cylindrical body; and   (v) one or more inlets and one or more outlets provided in the cylindrical body walls fluidly coupling the cylindrical body cavity with one or more external fluid paths.   
     
     
         2 . The pump of  claim 1 , further comprising a pump motor aligned along the long axis of the pump mechanism configured to rotate the shaft when in use. 
     
     
         3 . The pump of  claim 1 , wherein one or more inlet, one or more outlet, or one or more inlet and outlet is coupled to a valving mechanism. 
     
     
         4 . A system comprising a plurality of pumps of  claim 1 . 
     
     
         5 . The system of  claim 4 , wherein the pumps are configured in a series with respect to fluid flow. 
     
     
         6 . The system of  claim 4 , wherein the pumps are configured parallel with respect to fluid flow. 
     
     
         7 . The system of  claim 4 , wherein the system includes both pumps in series and in parallel.