Axial flow fluid compresser

A fluid compressor comprising:

• a cylinder having a suction-side end and a discharge-side end;
• a columnar rotating body located in the cylinder so as to extend along the axial direction of the cylinder and be eccentric thereto, and rotatable relative to the cylinder while part of said rotating body is in contact with the inner peripheral surface of the cylinder, said rotating body having a spiral groove on the outer peripheral surface thereof, said groove having pitches gradually narrowing with distance from the suction-side end of the cylinder;
• a spiral blade fitted in the groove so as to be slidable, substantially in the radial direction of the rotating body, having an outer peripheral surface intimately in contact with the inner peripheral surface of the cylinder, and dividing the space between the inner peripheral surface of the cylinder and the outer peripheral surface of the rotating body into a plurality of operating chambers having volumes gradually decreasing with distance from the suction-side end of the cylinder;
• and
• drive means for relatively rotating the cylinder and the rotating body to successively transport a fluid introduced from the suction-side end of the cylinder into the cylinder toward the the discharge-side end of the cylinder through the operating chambers.