Apparatus of controlling the bubble size and contents of bubble, and that method

A device for adjusting a number and size of air bubbles comprising:

• a gas mixing part in which a liquid and a gas are mixed with each other to form an air bubble mixture;
• an air bubble fining part coupled to a lower end of the gas mixing part, including a plurality of first protrusions formed on an inner surface thereof so that the air bubble mixture introduced from the gas mixing part collides therewith, and including an air bubble crushing bar at a center thereof in an axial direction;
• an expanded pipe part formed on a lower end of the air bubble fining part and directly connected to the lower end of the air bubble fining part, and dispersing and discharging the air bubble mixture;
• a liquid introduction part controlling a flow rate and a flow speed of the liquid into the gas mixing part;
• a gas introduction part controlling a flow rate and a flow speed of the gas introduced into the gas mixing part;
• and
• a storage tank in which the air bubble mixture discharged from the expanded pipe part is stored and a measurement sensor measuring the number and size of air bubbles contained in the stored air bubble mixture is provided,
• wherein the expanded pipe part has a tapered shape in which an inner channel is widened from an upper portion thereof directly connected to the lower end of the air bubble fining part toward a lower portion thereof through which the air bubble mixture is discharged;
• wherein a lower portion of the gas mixing part connected to the air bubble fining part is provided with an acceleration part, and the acceleration part has a tapered shape in which a width of an inner channel is decreased from an upper portion thereof toward a lower portion thereof;
• and
• wherein the storage tank is directly connected to the lower portion of the expanded pipe part.