Patent ID: 8002246

Claim:
An aeration apparatus for use under a condition that is immersed in a target substance, to inject air into the target substance so as to aerate the target substance, comprising: a lower cylinder having an opening formed at a lower end thereof to allow the target substance to flow thereinto, the lower cylinder being divergent upwardly from the opening; an air accumulator chamber formed based on a space surrounded by a ceiling portion, an outer cylinder provided above and in continuous relation to the lower cylinder, and an inner cylinder disposed inside the outer cylinder with a distance therebetween and formed to allow a lower end thereof to have a diameter greater than that of the opening of the lower cylinder, the space being hermetically closed during stop of the aeration apparatus; an air jet device including an air delivery pipe disposed on the ceiling portion at a position inside the air accumulator chamber, the air delivery pipe having a plurality of air jet nozzles adapted to jet air toward the target substance and arranged at intervals; and a compressed-air supply pipe connected to the air delivery pipe through a connecting pipe at a position outside the air accumulator chamber, to supply compressed air thereto.