Patent ID: 6729864
Filing Date: 2004-05-04
Classification: F01C,F04C

Abstract:
A rotary positive displacement machine comprising:a stator having a circular cylindrical internal surface delimiting an operating chamber, the stator having fluid inlet/outlet ports; a rotor in the operating chamber, the rotor being mounted so as to be rotatable relative to the stator about the axis of the said internal surface, the rotor having a cylindrical external surface, the said axis passing through the rotor, a generatrix of the external surface being adjacent to the said internal surface, and a diametrically opposite generatrix being spaced from the said internal surface; a sealing member projecting substantially radially through a slot in the stator into the operating chamber and being movable substantially radially, the sealing member extending parallel to the said axis and having a length substantially equal to that of the rotor; means for keeping the radially inner end of the sealing member adjacent the external surface of the rotor; and a shutter at one end of the rotor, the shutter rotating with the rotor and having a circular cylindrical external surface covering one of the said ports, the said one port opening in the circular cylindrical internal surface of the stator, the shutter having a through-hole with a first end in the circular cylindrical external surface and a second end opening into the operating chamber, the first end periodically overlapping the said one port as the rotor rotates relative to the stator.