Progressing cavity pump

Details Progressing cavity pump Progressing cavity pump

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 5/00 (2006.01) F04B 53/02 (2006.01) F04C 2/107 (2006.01)

Patent

CA 2255014

A progressing cavity pump (10) is provided in which the compressive fit between the rotor (18) and stator (20) is gradually reduced with the distance from the suction end (32) of the pump. This gradual decrease in compressive fit allows for increased slippage near the discharge end of the pump, resulting in better distribution of the internal differential pressure along the length of the pump. The differential pressure distribution in turn reduces heat buildup near the discharge end (34), increasing the life of the elastomeric stator or rotor.

L'invention concerne une pompe (10) à cavité progressive dans laquelle l'ajustement compressif entre le rotor (18) et le stator (20) est réduit graduellement avec la distance depuis l'extrémité d'aspiration (32) de la pompe. Cette augmentation graduelle d'ajustement compressif permet un glissement accru près de l'extrémité de débit de la pompe, ce qui a pour effet une meilleure répartition de la pression différentielle intérieure sur la longueur de la pompe. La répartition de pression différentielle réduit à son tour l'accumulation de chaleur près de l'extrémité de débit (34), augmentant la durée de vie du stator ou du rotor élastomère.

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