| 摘要 |
<p num="1"><br/><br/><br/>In an aerator (10) for aquariums and ponds there is an impeller (60) operated <br/>by an electric motor (20) having a first entry (246, 347) for the intake of <br/>water, a second entry (44) for the intake of air and an exit (254) where the <br/>water and air flow comes out, the impeller (60), when it is operated, sucks <br/>water from said first entry (246, 347), creates a lower pressure which sucks <br/>air from said second entry (44) and mixes said sucked air with water <br/>generating a flow which comes out from the exit (254).<br/>
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