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Abstract

A Roots-type rotary volumetric compressor with two double-lobed rotors in which, for each of the four quadrants defined by the major and minor axes of the rotor, each rotor has a particular profile constituted by seven arcs of circles which extend from the point of intersection with the minor axis to the point of intersection with the major axis. The coordinates of the respective centers of curvature (C.sub.1 to C.sub.7) of the arcs in a frame of reference having its origin at the center of the rotor and its axes of the asbcissae (X) and ordinates (Y) coincident with the minor and major axes of the rotor, and the values of the respective radii of curvature (R.sub.1 to R.sub.7), are given. The arcs have respective angular extents (A.sub.1 to A.sub.7) of substantially 12.degree., 40.degree., 1.degree., 29.degree., 88.degree., 13.degree. and 6.degree..

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First Claim