Patent ID: 8695335

Claim:
A liquid ring system comprising; a housing; a rotor mounted inside said housing; a liquid ring inside said housing and engaged by said rotor, said liquid ring comprising a liquid and having an inner gas-liquid surface, and said rotor having a number of gas cells defined in part by the liquid in the liquid ring, and at least one wall of each of said cells consisting of a part of the inner gas-liquid surface of said liquid ring; wherein said part of the inner gas-liquid surface performs a radial reciprocating movement relative to an axis of rotation of said rotor; at least one of said cells is in fluid connection with at least a positive displacement space integrated with or formed at least in part by said rotor; a plurality of the gas cells are in fluid connection with at least one other gas cell, the plurality of gas cells having a phase difference of between 0° and ±180°, inclusive of ±180°, between minimum gas volumes of the gas cells in fluid connection; and said liquid includes water, CO 2 , NH 3 , CH 4 , Freon, liquid air, a molten salt or a molten metal.