Patent ID: 7832028

Claim:
A fine-bubble generator comprising: two fine-bubble generating sections, each of the fine-bubble generating sections including: a fluid rotating chamber defined by a circumferential wall around an imaginary center line, and partition walls arranged at both ends of the circumferential wall in the direction of the imaginary center line; a liquid introducing passage configured so as to communicate with the fluid rotating chamber for introducing a liquid along a direction that forms a position twisted relative to the imaginary center line; a gas introducing passage opened in a first one of the partition walls of the fluid rotating chamber for introducing a gas into the fluid rotating chamber; and a spout opened in a second one of the partition walls of the fluid rotating chamber; wherein the two fine-bubble generating sections are arranged so that the spouts of the two fine-bubble generating sections face each other, and so that the fluid rotational flows generated in the fluid rotating chambers of the two fine-bubble generating sections rotate in the same direction.