The utility model discloses an aerator for mixing air,
oxygen and liquid, which comprises a shell, a driving mechanism and an
oxygen conveying component, and the shell is provided with a water inlet and a water outlet; the driving mechanism comprises a driving unit, a transmission shaft and an
impeller, the
impeller can drive fluid to be output from the water inlet to the shell and sent out from the water outlet, the transmission shaft is a hollow shaft and is provided with an air inlet and an air outlet which are connected to an inner cavity of the transmission shaft, and the air outlet is located at the position corresponding to the
impeller; an
oxygen outlet of the oxygen conveying
assembly is formed in the position corresponding to the impeller or located on a fluid advancing path, when the impeller drives water to flow, negative pressure can be formed at the air outlet, external air is sucked in from the air inlet, the air is continuously sucked in from the air inlet, and meanwhile the oxygen conveying
assembly can be used for conveying oxygen. The oxygen conveying
assembly can convey oxygen to be mixed with
water flow to further improve the dissolved oxygen amount, air, oxygen and water are fully mixed, and therefore the dissolved oxygen amount of the
water body is greatly improved, and the problem of layering of the
water body of the fishpond can be well solved.