Importance

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Abstract

A rotary positive displacement device comprises a housing having low and high pressure ports; first and second rotors each having a frusto-spherical outer surface, an axial surface, a shaft and a rotational axis. The axial surfaces comprise a teardrop surface and an involute surface together defining a lobe and a corresponding valley. High and low pressure openings each extend between the first and second rotors and the corresponding high and low pressure ports. The first and second rotors intermesh so that the at least two chambers are separated by the axial surfaces of the first and second rotors, each chamber having a variable volume as the first and second rotors rotate about their respective rotational axes. A lower edge of the high pressure opening is positioned along an outer diameter of the outer surface of the second rotor and between the second rotor shaft and the first rotor valley.

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First Claim