Patent ID: 6030190
Filing Date: 2000-02-29
Classification: F04C

Abstract:
A rotary displacement pump comprising:a rotor;a stationary stator having a base plate and an inner clamping plate, wherein said base plate is detachably fastened to an outer side of said inner clamping plate facing away from said rotor;said base plate having a closed center and an annular surface extending over a part circle or a full circle;an inlet opening into said annular surface and an outlet extending away from said annular surface;a diaphragm spanning said annular surface and having edges tightly clamped to said base plate by said inner clamping plate so as to define a pumping channel;wherein said driven rotor is rotatably mounted at an inner side of said clamping plate opposite said outer side coaxially to said annular surface;said rotor comprising a plurality of rollers freely rotatably supported in a common support rotating coaxially to said annular surface and axially slidable relative to said stator;a circumferential arrangement of individually moveable pressure transmitting members resting with a front end on said diaphragm;said rollers positioned at a back side of said pressure transmitting members and acting thereon to press said diaphragm sequentially locally against said annular surface so that said diaphragm interrupts the path from said inlet to said outlet;means for adjusting a pumping output of said pump;a spring acting on said common support of said rollers and forcing said rollers against said pressure transmitting members;a means for adjusting a spring pretension of said spring and thereby the pumping pressure, wherein said spring and said means for adjusting said spring pretension are arranged at a side of said stator facing said rotor.