FINE BUBBLE GENERATOR

WIPO Patent Application WO/2021/157485

A1

Provided is a fine bubble generator that has a relatively simple structure and that makes it possible to efficiently produce ultra-fine bubbles.　The fine bubble generator is an ultra-fine bubble generator comprising a cylindrical interior side wall and closing walls which close both ends thereof, the side wall is equipped with a fluid introduction port and one of the closing walls is equipped with a gas/liquid discharge port, the fluid introduction port is provided closer to the gas/liquid discharge port from midway between the closing walls so as to pass through the side wall in a tangential direction of the cylindrical interior side wall, and a spiral groove is formed in the cylindrical interior side wall. The angle of inclination of the fluid introduction port in the fine bubble generator is approximately the same as the angle of inclination of the spiral groove.　As a result of the present invention, shear is generated in the spiral groove with respect to a swirling flow of a gas/liquid mixture generated within the fine bubble generator between the swirling flow and said spiral groove, the swirling capacity of the swirling flow is additionally maintained by setting the angles of inclination so as to be approximately the same, and it is thereby possible to obtain extremely fine bubbles within a fluid and efficiently produce ultra-fine bubbles.

NAKAGAWA AKIRA (JP)
SUGIYAMA WATARU (JP)

PCT/JP2021/003310

August 12, 2021

January 29, 2021

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AKIMOKU IRON WORKS CO LTD (JP)
UNIV AKITA (JP)

B01F3/04; B01F5/00

JP2010012454A	2010-01-21
JP2008119623A	2008-05-29
JP2011088045A	2011-05-06
JP2009101329A	2009-05-14
JP2005169269A	2005-06-30
JP4118939B1	2008-07-16

SASA Kentaro et al. (JP)

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