MINIMAL CONTACT SEAL POSITIVE DISPLACEMENT DEVICE METHOD AND APPARATUS

摘要

A positive displacement device that incorporates two rotors (22, 24) that are offset from collinear and each comprising a first and second set of vanes (28, 32) where the engagement surfaces of the first set of vanes (28) are adapted to only engage when the rotors are in the top dead center (TDC) location and the second set of lobes (32) of each rotor only engage one another at the bottom dead center (BDC) position of rotation.