| 摘要 |
Provided is an aeration apparatus, which is enabled, when stopped, to prevent an air injection nozzle from being choked, by keeping the air injection nozzle out of contact with an object to be treated. An aeration apparatus (1) is dipped in the object and blows air to aerate the object. The aeration apparatus (1) comprises a lower cylinder (3) having such an opening (3a) formed at its lower end that the object flows thereinto, an air reservoir (4) formed of a space defined by an outer cylinder (4a) merging into the upper portion of the lower cylinder (3) and by an inner cylinder (4b) and a ceiling (4c) arranged at a spacing in that outer cylinder, an air feeding pipe (6) arranged in the ceiling (4c) and having a plurality of air injection nozzles (6a) for injecting air toward the object, a compressed air feeding pipe (7) connected outside of the air reservoir to the connecting pipe (6b) of the air feeding pipe (6) for feeding the compressed air, and an upper cylinder(S) merging into the inner cylinder (4b) of the air reservoir (4) and having an opening (5a) formed at its upper end for the object to flow out.
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