Patent ID: 8323012

Claim:
A positive displacement apparatus comprising: a stator housing having an interior bore therethrough; a first and a second endplate connected to the stator housing at each end of the interior bore; a rotor having a rotor shaft located in the interior bore, wherein one end of the rotor shaft is connected to an external power source for rotating the rotor within the interior bore; a rotor centering device for centering the rotor with respect to the stator housing to prevent the rotating rotor from contacting the interior bore and the first and second endplates; a rotating vane assembly having at least one vane; and a vane centering device having axial positioning control rods for connecting the rotating vane assembly to the rotor shaft and centering the at least one vane with respect to the rotor, wherein the rotor centering device controls a radial position of the rotating vane assembly and the vane centering device controls an axial position of the rotating vane assembly to prevent contact of the at least one vane, at all times during operation of the positive displacement apparatus, with the stator housing interior bore and the first and second endplates.