Patent ID: 6666666
Filing Date: 2003-12-23
Classification: F04C

Abstract:
A multi-chamber positive displacement fluid device comprising:a suction stage having one or more axially stacked positive displacement suction sections, each suction section having a rotor chamber for pumping fluid from an inlet adapted for connection to a fluid source to a discharge manifold; at least one pressure stage, arranged axially with the suction stage, each pressure stage having one or more axially stacked positive displacement pressure sections, each pressure section having a rotor chamber for pumping fluid from a suction manifold to a discharge manifold adapted for connection to a fluid destination; a cross-over section sandwiched axially between the suction stage and each successive pressure stage, the cross-over section having passage for fluid connection of each stage's discharge manifold to the suction manifold of each successive pressure stage; a pair of parallel and contra-rotating rotors operable in the rotor chamber of each section for displacing fluid from each chambers' inlet to its respective discharge when rotated, the pair of rotors for each section being aligned axially with the pair of rotors for each other section; a drive shaft extending axially and rotatably into each chamber of the at least one suction stage and the at least one pressure stage for rotating one rotor of the pair of rotors in each section; an idler shaft parallel to the drive shaft and extending axially and rotatably into each chamber of the at least one suction stage and the at least one pressure stage for the other rotor of the pair of rotors; and timing means between the drive shaft and idler shaft for contra-rotating the drive and idler shafts and the pair of rotors.