Reciprocating pump system

Abstract

A reciprocating pump assembly includes a linear electric motor having a cylinder, a rotor, and a stator. A multiple of check valves are located near each end of the cylinder. Pairs of check valves are mounted within a T-shaped fitting which permit each fitting to operate alternatively as an inlet and a discharge depending on the direction of the rotor stroke. Another pump assembly utilizes the rotor to separately drive pistons through pushrods.

1 . A reciprocating pump assembly comprising: 
 a cylinder which defines a longitudinal axis;    a first check valve mounted adjacent a first cylinder end;    a second check valve mounted adjacent said first cylinder end, said second check valve checking a flow from said cylinder in a direction opposite than said first check valve;    a third check valve mounted adjacent a second cylinder end;    a fourth check valve mounted adjacent said second cylinder end, said fourth check valve checking a flow from said cylinder in a direction opposite than said third check valve;    a rotor mounted within said cylinder; and    a stator mounted about said cylinder to reciprocally drive said rotor along said longitudinal axis.    
   
   
       2 . The reciprocating pump assembly as recited in  claim 1 , wherein said first check valve, said second check valve, said third check valve and said fourth check valve are reed valves.  
   
   
       3 . The reciprocating pump assembly as recited in  claim 1 , wherein said rotor includes an iron core with alternating bands of copper and iron mounted onto said iron core.  
   
   
       4 . The reciprocating pump assembly as recited in  claim 1 , further comprising a seal mounted near each end of said rotor.  
   
   
       5 . The reciprocating pump assembly as recited in  claim 1 , wherein said stator includes a multiple of cooling fins interspersed between a multiple of magnets.  
   
   
       6 . The reciprocating pump assembly as recited in  claim 5 , further comprising a tie bar which axially retains said multiple of cooling fins and said multiple of magnets.  
   
   
       7 . The reciprocating pump assembly as recited in  claim 1 , further comprising a controller to control movement of said rotor within said stator.  
   
   
       8 . The reciprocating pump assembly as recited in  claim 7 , wherein said controller includes a variable speed controller.  
   
   
       9 . The reciprocating pump assembly as recited in  claim 7 , wherein said controller includes a switched reluctance speed controller.  
   
   
       10 . The reciprocating pump assembly as recited in  claim 1 , wherein said first check valve and said second check valve are contained within a first fitting and said third check valve and said fourth check valve are contained within a second fitting.  
   
   
       11 . The reciprocating pump assembly as recited in  claim 10 , wherein said first fitting and said second fitting are T-shaped fittings.  
   
   
       12 . The reciprocating pump assembly as recited in  claim 1 , wherein said first check valve and said second check valve are opposed within a first fitting and said third check valves and said fourth check valve are opposed within a second fitting.  
   
   
       13 . A reciprocating pump assembly comprising: 
 a cylinder which defines a longitudinal axis;    a rotor mounted within said cylinder;    a first piston cylinder;    a first piston mounted within said first piston cylinder;    a first push rod mounted to said first piston and said rotor to drive said first piston along said longitudinal axis in response to movement of said rotor;    a first check valve mounted to said first piston cylinder;    a second check valve mounted to said first piston cylinder, said second check valve checking a flow from said first piston cylinder in a direction opposite than said first check valve;    a second piston cylinder;    a second piston mounted within said second piston cylinder;    a second push rod mounted to said second piston and said rotor to drive said second piston along said longitudinal axis in response to movement of said rotor;    a third check valve mounted to said second piston cylinder;    a fourth check valve mounted to said second piston cylinder, said fourth check valve checking a flow from said second piston cylinder in a direction opposite than said third check valve; and    a stator mounted about said cylinder to reciprocally drive said rotor along said longitudinal axis.    
   
   
       14 . The reciprocating pump assembly as recited in  claim 13 , wherein said first check valve and said second check valve are reed valves.  
   
   
       15 . The reciprocating pump assembly as recited in  claim 13 , wherein said first check valve and said second check valve are located within an end plate of said piston cylinder.