Vane type compressor having an improved rotatable sleeve

A vane type rotary compressor comprising a housing having a cylindrical inner wall surface, a rotatable sleeve having outer and inner surfaces and disposed in the housing for rotation about a first longitudinal axis, a rotor disposed in the sleeve for rotation about a second longitudinal axis which is offset from the first longitudinal axis, a plurality of vanes carried by the rotor to extend in radial directions and maintained in contact with the inner surface of the sleeve to divide the interior of the sleeve into a plurality of working chambers, the rotatable sleeve being made of an Si-Al type alloy containing 12 to 25% by weight of Si, said sleeve being age hardened so that Si particles are distributed substantially uniformly therein, said sleeve having an anodic oxidation coating of 100 to 300 microns thickness on at least the outer surface thereof and a coating of wear resistant resin overlying the anodic oxidation coating formed on the outer surface thereof.