Embodiments of the invention are directed toward a novel pressurized vapor cycle for distilling liquids. In some embodiments of the invention, a liquid purification system is revealed, including the elements of an input for receiving untreated liquid, an evaporator condenser (600) coupled to the input for transforming the liquid to vapor and for transforming compressed vapor into a distilled liquid produce, a head chamber (300) for collecting the vapor from the evaporator condenser (600), a regenerative blower in communication with the head chamber for compressing the vapor, wherein the evaporator condenser (600) comprising a plurality of parallel core evaporator tubes, each tube having a first open end in communication with the input and a second open end in communication with the head chamber (300). Other embodiments of the invention are directed toward heat management, and other process enhancements for making the system especially efficient.

A single-stage liquid-ring vacuum pump having a double axial inlet with flat-distribution plates comprises a central body (2), an impeller (5) eccentrically housed in a chamber (4) delimited by the central body (2), a flanged suction manifold (15) in fluid communication with two suction openings (8) located at opposite ends of the central body (2), a flanged exhaust manifold (17) in fluid communication with two exhaust openings (9) located at opposite ends of the central body (2). The flanged suction manifold (15), flanged exhaust manifold (17) and feed manifold are integrated into the central body (2), so as to reduce weights and bulkiness as compared with the pumps of the known art, the pump performance being the same.

A liquid ring gas pump having two axially adjacent, serially connected stages. Gas to be com­pressed is admitted to the first stage of the pump solely via a first stage inlet opening at the end of the first stage remote from the second stage. The sole outlet for gas to leave the first stage in order to flow to the second stage is a first stage outlet at the end of the first stage adjacent to the second stage. A residual gas outlet is provided at the end of the first stage remote from the second stage for allowing compressed gas that is unable to exit via the first stage outlet to exit via the residual gas outlet and re-enter the first stage via a residual gas inlet also provided at the end of the first stage remote from the second stage and located after the first stage inlet but before the first stage outlet in the direction of rotor rotation.

In einem Flüssigkeitsring-Verdichter wird durch Zugabe von Luft bzw. Gas von aussen mittels Kanälen (9), mit einem Druck der etwa dem Verdichtungsdruck entspricht, in bestimmten Druckschlitzbereichen (5) erreicht, daß die unter bestimmten Betriebsbedingungen auftretenenden Erosions-und Kavitationsschäden vermieden werden.

A liquid ring vacuum pump or compressor with a long axial dimension whose rotor blades are notched intermediate to their ends as at (28, 30, 32) to define annular gaps. Post members (64, 66, 68, 70, 72, 74) having arcuate inlet and outlet openings, are secured to the casing and project inward radially towards the rotor hub into the annular gaps.

In this way the buckets formed by the rotor blades are filled with fluid from both axial ends of each section, thus maintaining a high volumetric efficiency with relatively high ratios of axial length to the diameter of the pump.