Magnetically driven positive displacement pump and thrust bearing assembly

A pumping assembly including a positive displacement pump with a bracket and a housing defining an internal fluid chamber having front and rear inner walls;

• a rotor positioned in said fluid chamber, said rotor having a front face and a rear face, each of said faces spaced apart from a corresponding inner wall of said fluid chamber to define predetermined clearances therebetween;
• a shaft having a first end connected to said rotor to effect rotation thereof;
• a sealed container surrounding and enclosing a second end of said shaft, the interior of said container being in communication with said fluid chamber;
• a thrust bearing assembly positioned within said container, said bearing assembly including an adjusting sleeve and an adjusting plate, said adjusting sleeve being attachable to said bracket and having a central bore, said sleeve being positioned between said bracket and said plate such that said shaft extends through and rotates within said bore, said sleeve including a stationary seat extending around said shaft;
• said adjusting plate being connectable to said shaft for rotation therewith and such that said adjusting plate is in relative rotatable engagement with said stationary seat, said adjusting sleeve and said adjusting plate preventing movement of said shaft and said rotor in a direction away from said adjusting sleeve such that said predetermined clearances between said faces of said rotor and said inner walls of said chamber are substantially uniformly maintained as said rotor rotates notwithstanding forces urging longitudinal movement of said shaft.