Patent ID: 6736377
Filing Date: 2004-05-18
Classification: B01F

Abstract:
An improved structure for an oxygen adding and aeration device comprising:a pump; a two-layer impeller having an upper-layer impeller and a lower-layer impeller, both impellers having their own impeller inlets and impeller outlets; a pump case having an upper-layer outlet and a lower-layer outlet; an air tube having a plurality of filter holes on a tube wall thereof; the pump being installed in water and a driving axis of the pump being vertical to a water level, the two-layer impeller being installed on a top of the pump, the pump case being installed on the top of the pump and covering on an outside of the two-layer impeller, the upper-layer outlet of the pump case being relative to the impeller outlet of the upper-layer impeller of the two-layer impeller, and the lower-layer outlet being relative to the impeller outlet of the lower-layer impeller of the two-layer impeller, a bottom of the air tube connecting and through to the impeller inlet of the lower-layer impeller of the two-layer impeller, a top end of the air tube protruding out of a water level when starting the pump, the two-layer impeller being then driven to deliver air from the air tube into the lower-layer impeller, partial water being sucked from filter holes into the air tube to mix with air becoming an air-water injection flow, other partial water being sucked from the impeller inlet of the upper-layer impeller and passing through the impeller outlet of the upper-layer impeller and the upper-layer outlet of the pump case to form a water injection flow; via a high-speed and strong structure of the upper-layer water injection flow guiding the lower-layer air-water injection flow moving forward so that a time and a distance of bubbles retaining in water being both raised to increase oxygen in the water.