PROGRESSING CAVITY PUMP

摘要

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.