Polyurethane stator for a progressive cavity pump

Abstract

A progressive cavity pump including a shell, a stator removably affixed within the shell, a rotor positioned interior of the stator within the shell and a motor interconnected to the rotor so as to rotate the rotor. The stator is formed of polyurethane material. The polyurethane material of the stator has a durometer hardness of 50-98 shore. The polyurethane material of the stator has an operating temperature of between 212° F. and 400° F. The polyurethane material of the stator had a tensile stress of between 100-5100 p.s.i. The stator is positioned between the fluid inlet and outlet of the shell.

We claim:  
     
         1 . A progressive cavity pump comprising: 
 a shell;    a stator removably affixed within said shell, said stator being of a polyurethane material;    a rotor positioned interior of said stator within said shell; and    a motor interconnected to said rotor so as to rotate said rotor.    
     
     
         2 . The pump of  claim 1 , said shell having a cap member removably affixed at an end thereof, said stator being removable therethrough.  
     
     
         3 . The pump of  claim 1 , said rotor having a configuration of a helix with a pitch, said stator being a helix with a pitch which is twice the pitch of said rotor.  
     
     
         4 . The pump of  claim 1 , said polyurethane material of said stator having a durometer hardness of 50-98 shore.  
     
     
         5 . The pump of  claim 1 , said polyurethane material of said stator having an operating temperature of between 212° F. and 400° F.  
     
     
         6 . The pump of  claim 1 , said polyurethane material of said stator having a tensile stress of between 100 and 5100 p.s.i.  
     
     
         7 . The pump of  claim 1 , said polyurethane material of said stator being a M-80-A-100-0600 elastomer.  
     
     
         8 . The pump of  claim 1 , said polyurethane material of said stator being a M-50-d-100-1400 elastomer.  
     
     
         9 . The pump of  claim 1 , said stator having a diameter between 2 inches and 10 inches inclusive.  
     
     
         10 . The pump of  claim 1 , said shell having an inlet and an outlet, said stator positioned between said inlet and said outlet.  
     
     
         11 . The pump of  claim 1 , further comprising: 
 a drive means connected to said motor and said rotor, said drive means rotating said rotor relative to a rotation of a shaft of said motor.    
     
     
         12 . A stator for a progressive cavity pump comprising: 
 a body having a helix shape, said body being of a polyurethane material.    
     
     
         13 . The stator of  claim 12 , said polyurethane material of said body having a durometer hardness of 50-98 shore.  
     
     
         14 . The stator of  claim 12 , said polyurethane material of said body having an operating temperature of between 212° F. and 400° F.  
     
     
         15 . The stator of  claim 12 , said polyurethane material of said body having a tensile stress of between 100 and 5100 p.s.i.  
     
     
         16 . The stator of  claim 12 , said polyurethane material of said body being a M-80-A-100-0600 elastomer.  
     
     
         17 . The stator of  claim 12 , said polyurethane material of said body being a M-50-d-100-1400 elastomer.  
     
     
         18 . The stator of  claim 12 , said body having a diameter between 2 inches and 10 inches inclusive.  
     
     
         19 . The stator of  claim 12 , said body having an exterior surface, the stator further comprising: 
 means for removably affixing said stator within a shell of the progressive cavity pump.