Patent ID: 9404493
Filing Date: 2016-08-02
CPC Classification: F04C,F16C,Y10T

Claim Text:
1. A progressive cavity pump comprising: a stator, the stator including a helical shaped interior with a first pitch; a rotor inside the stator, the rotor including a helical shaped exterior with a second pitch, wherein the second pitch is different from the first pitch, wherein the rotor is effective to rotate with respect to the stator and effective to move eccentrically within the stator to define at least one cavity inside the stator; and a first bearing and a second bearing between the rotor and the stator, wherein the first and second bearings are sized and shaped so that the rotor is effective to rotate inside the first and second bearings and the first and second bearings are effective to move eccentrically along with the rotor; and a thrust bearing disposed on the rotor and in mechanical communication with a spring wherein the spring is effective to bias the first bearing toward the second bearing.