Patent ID: 6155807
Filing Date: 2000-12-05
Classification: F04C,F05C

Abstract:
An eccentric worm pump comprising:a tubular stator extending along a main axis and having an intake side and an output side;an eccentric rotor worm fitting in the stator and centered on a worm axis offset from the main axis;an intake housing forming an intake compartment opening into the intake side;a connecting shaft extending along the main axis from the worm through the intake compartment;a drive shaft extending along the main axis from the connecting shaft out of the intake compartment, the worm, connecting shaft, and drive shaft being unitarily formed of plastic with a flex region of reduced cross section between the connecting shaft and the drive shaft another flex region of reduced cross section between the connecting shaft and the worm, the connecting shaft being of greater cross section than either of the flex regions along its entire length;a seal housing mounted on the intake housing and sealing around the drive shaft; anddrive means connected to the drive shaft for rotating the drive shaft, connecting shaft, and worm about the worm axis and thereby drawing fluid through the stator from the intake side to the output side thereof.