Patent ID: 8172205

Claim:
An aerator for aquariums and ponds comprising: (a) an impeller for pumping water having a rotation axis and provided with a hub from which a plurality of blades connected to the hub extend; (b) motor means for operating the impeller, wherein the motor means operates to rotate the impeller about the rotation axis within a casing of the aerator; (c) a first entry for intake of water in the impeller; (d) a second entry for intake of air, wherein the second entry for intake of air is positioned in an area disposed between the rotation axis of the impeller and the hub of the impeller; and (e) an exit where water and air flow comes out from the impeller, wherein the impeller, when operated, sucks water from the first entry, creates a lower pressure that sucks air from the second entry, and mixes the sucked air with water that comes out from the exit, wherein the second entry for intake of air is positioned in an area between the rotation axis of the impeller and a peripheral end of the plurality of blades, wherein in the hub of the impeller there are holes arranged so as to connect an inside of the hub with a space defined between the blades, wherein the inside of the hub is connected to the second entry for intake of air so that, as the impeller rotates, air is drawn inside the hub from the second entry by lower pressure, passes through the holes in the hub and comes out from the impeller through the exit together with the sucked water.