Microbubble generating device

Abstract

Provided is a microbubble generating device with a simple structure that can stably and continuously discharge microbubbles in larger volumes from a discharge section. The microbubble generating device is provided with: a liquid introduction section 2 for introducing a liquid L 1 within a tank T; a gas introduction section 3 a for introducing a gas; a pressure feed section 4 for pressure feeding a liquid fluid L 2 fed via the liquid introduction section 2 and the gas fed via the gas introduction section 3 a; a microbubble generating section 5 for generating microbubbles B in the liquid fluid L 2 pressure fed by the pressure feed section 4 and discharging the liquid fluid to the liquid L 1; and a discharge flow rate adjustment section 55 for adjusting the discharge volume of the liquid fluid L 2.

1 . A fine bubble generating device comprising a pump for pumping a liquid fluid from a liquid, a gas introducing inlet for introducing gas into the liquid fluid, and a fine bubble generating section used in the liquid for generating fine bubbles in the liquid fluid from the gas introduced from the gas introducing inlet and the liquid fluid pumped out from the pump and discharging the liquid fluid and the fine bubbles to the liquid, the fine bubble generating section comprising:
 a container body;   a first liquid fluid introducing inlet for introducing a liquid fluid pumped out from the pump into the container body;   a discharging outlet for discharging the liquid fluid; and   a liquid fluid swirling section for making the liquid fluid introduced from the first liquid fluid introducing inlet swirl in a spiral toward the discharging outlet;   wherein the container body comprises
 a preliminary swirl chamber where a first swirl flow flows, the first swirl flow being introduced from the first liquid fluid introducing inlet, a main swirl chamber where a second swirl flow flows, the second swirl flow being in the opposite direction from the first swirl flow flowing through the preliminary swirl chamber, and 
 a second liquid fluid introducing inlet for introducing the liquid fluid from the preliminary swirl chamber to the main swirl chamber. 
   
     
     
         2 . The fine bubble generating device of  claim 1 , wherein
 the main swirl chamber and the preliminary swirl chamber are formed by a reverse swirl flow generating wall, and   the second liquid fluid introducing inlet is provided on the reverse swirl flow generating wall.   
     
     
         3 . A method of producing a fine bubble containing-liquid fluid, comprising:
 generating fine bubbles in a liquid fluid using a fine bubble generating device, the fine bubble generating device comprising a pump for pumping the liquid fluid from a liquid, a gas introducing inlet for introducing gas into the liquid fluid, and a fine bubble generating section used in the liquid for generating the fine bubbles in the liquid fluid from the gas introduced from the gas introducing inlet and the liquid fluid pumped out from the pump and discharging the liquid fluid and the fine bubbles to the liquid, the fine bubble generating section comprising:   a container body;   a first liquid fluid introducing inlet provided on the container body for introducing the liquid fluid pumped out from the pump into the container body;   a discharging outlet provided on the container body for discharging the liquid fluid introduced from the first liquid fluid introducing inlet;   a liquid fluid swirling section provided in the container body for making the liquid fluid introduced from the first liquid fluid introducing inlet swirl in a spiral toward the discharging outlet; and   a discharged flow volume adjusting section comprising a baffle board that is movable in an approximately perpendicular direction to an end face of the discharging outlet by the swirled liquid flow generated by the liquid fluid swirling section.