Patent ID: 6955341

Claim:
An apparatus for dissolving gas into liquid, comprising: a mixer comprising: an axially extending container, having a gas inlet and a valve for regulating flow rate of gas entering the container; a quasi-Venturi tube axially arranged in the container, with one end of the quasi-Venturi tube being a liquid inlet port and the other end being a liquid outlet port, the quasi-Venturi tube having a tube wall being provided with a gas drawn-in port; a tank enclosure, comprising: an inner tank having a wall; an outer tank having a wall enclosing the inner tank and forming a space between the wall of the inner tank and the wall of outer tank; a winding pipe having an inlet and an outlet and extending from outside to inside of the outer tank and winding around the inner tank and passing through the wall of the inner tank with the outlet arranged inside of the inner tank; a liquid/gas output line provided at a bottom of the tank enclosure; a liquid/gas pipe with one end thereof connecting to the liquid outlet port of the quasi-Venturi tube and the other end thereof connecting to the bottom of the tank enclosure and inserting into inside of the tank enclosure so that the liquid flowing out of the liquid/gas pipe forms a whirlpool inside the tank enclosure; a pump having an outlet port connecting to the liquid inlet port of the quasi-Venturi tube and an inlet port connecting to the liquid/gas output line; and a liquid/gas mixture outlet provided between the outlet port of the pump and the liquid inlet port of the quasi-Venturi tube.