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In an aerator (10) for aquariums and ponds there is an impeller (60) operated by an electric motor (20) having a first entry (246, 347) for the intake of water, a second entry (44) for the intake of air and an exit (254) where the water and air flow comes out, the impeller (60), when it is operated,

In an aerator (10) for aquariums and ponds there is an impeller (60) operated by an electric motor (20) having a first entry (246, 347) for the intake of water, a second entry (44) for the intake of air and an exit (254) where the water and air flow comes out, the impeller (60), when it is operated, sucks water from said first entry (246, 347), creates a lower pressure which sucks air from said second entry (44) and mixes said sucked air with water generating a flow which comes out from the exit (254).

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1. 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 th

1. 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. 2. An aerator according to claim 1, further comprising a conveying element that surrounds said impeller onto which there is said exit where water and air come out, and said conveying element at said exit is provided with a deflector so as to deviate water and air flow that comes out from the impeller from a direction essentially perpendicular to said rotation axis to a direction positioned between said rotation axis and the direction perpendicular to said rotation axis. 3. An aerator according to claim 2, wherein said conveying element comprises holes that connect said impeller with the outside environment so as to form said first entry for intake of water in said impeller. 4. An aerator according to claim 1, wherein the aerator further comprises a filter positioned near said first entry for the intake of water. 5. An aerator according to claim 1, wherein the aerator further comprises a protective cage placed around said impeller. 6. An aerator according to claim 1, wherein the aerator further comprises a lighting device for lighting said water and air flow. 7. An aerator according to claim 1, wherein said motor means comprises an electric motor. 8. An aerator according to claim 1, wherein said blades are flat and radially arranged with respect to said hub. 9. An aerator according to claim 1, wherein said blades are curvilinear. 10. An aerator according to claim 1, wherein said impeller comprises a number of blades greater than 10. 11. An aerator according to claim 1, wherein the motor means operates to rotate the impeller about the rotation axis within a casing of the aerator. 12. 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 so that mixing of water and air occurs just in the impeller, 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. 13. 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 so that mixing of water and air occurs just in the impeller, 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, andwherein in the hub of the impeller the holes arranged so as to connect the inside of the hub with the space defined between the blades include one hole arranged between two adjacent blades. 14. An aerator according to claim 13, wherein each blade extends radially from the hub, and the holes arranged in the hub so as to connect the inside of the hub with the space defined between the blades include one hole arranged between each pair of adjacent blades. 15. 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;(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 so that mixing of water and air occurs just in the impeller, 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; and(f) a channelling element that has a cylindrical opening defining the second entry for intake of air and has an air intake, wherein the cylindrical opening connects the air intake to the inside of the hub. 16. An aerator according to claim 15, wherein said cylindrical opening is parallelly and centrally arranged with respect to said rotation axis of said impeller. 17. An aerator according to claim 16, wherein said channelling element comprises a circular wall arranged in a radial direction with respect to the rotation axis of said impeller, and said impeller is positioned near said radial and circular wall of said channelling element so as to convey water and air flow generated by said impeller on one side.