Rotary compressor or motor with rotors having interengaging blades and recesses

In a rotary compressor or expander device of a type wherein the blades of a bladed rotor, having an end face between the blades, alternately penetrate into and retract from the recesses of a recessed rotor, also having an end face between the recesses, when the rotors are conjointly rotated in a chamber, said rotors rotating about axes that intersect one another at an acute angle, the chamber having a circumferential wall which defines a sliding seal with the periphery of the rotors, the feature of the recesses of the recessed rotor having end openings to said circumferential wall, and there being a high-pressure port in said circumferential wall having a supplemental portion which is operatively overlying and communicating only with the end openings of the recesses and having a main portion overlying the space between said opposed faces, said blades and recesses each having respective forward and rearward sides in the direction of rotor rotation as a compressor, and including passage means between the forward sides of each recess and blade for transferring fluid from said space between said rotor end faces, through said passage means, thence through said end opening of said recess and out said supplemental high-pressure portion when the blade penetrates into the recess, and means for sealing the rearward side of the blades and recesses when rotated as a compressor to preclude passage of fluid from between said rotor end faces.

In a rotary air compressor or expander device of the type having a first rotor including a plurality of circumferentially spaced recesses and a second rotor having a plurality of circumferentially spaced blades of equal number to said recesses and which can selectively interdigitate within said recesses, said rotors mounted for rotation about axes which intersect one another at an acute angle wherein said blades become fully inserted within said recesses at a high-pressure station, each recess having a closed end and opposed side walls diverging outwardly to an open mouth, said first rotor having a smooth face surrounding the open mouths of said recesses between adjacent recesses, and the volume of said recesses being unsymmetrical about a plane through said closed end perpendicular to said smooth face, said blades each having a sealing tip and opposed sides diverging from said tip to an enlarged root, and said sealing tip being engaged with a wall of said recess at said high-pressure station for isolating one recess from the next adjacent recess, a smooth face on the bladed rotor surrounding the roots of the blades between adjacent blades, said blade having a volume unsymmetrical about a plane through said tip and perpendicular to the face of the bladed second rotor, said forward side of a blade and forward confronting wall of a recess in the direction of the rotor rotation as a compressor being of matched and conforming shapes and closely confronting one another while at the point of rotor rotation in which the blade is furthest inserted in its respective recess, the unsymmetrical shape of said recesses and blades and the matched shapes of the confronting forward blade side and recess wall reducing headspace between a blade and recess at the high-pressure station, means enclosing said blades, recesses and respective rotor faces for forming chambers thereof, means for providing air to pass at said low-pressure station and means for removing air at said high-pressure station when compressing, and means for coupling said rotors to a driving source for rotating the rotors.