<；P>；PROBLEM TO BE SOLVED: To improve rearing environment or the like by solving such the problems that a barrier to growth in a crop grown in a building is present, and a pig, a cow, a chicken or the like reared in a barn sometimes catches plague because the introduction of outside air and the circulation of inside air are not present in the interior of the building if a ventilating fan and a circulating fan are not installed on a ceiling face or a gable face, and the interior is a nearly closed space. <；P>；SOLUTION: The centrifugal spray device is constituted as follows. A cylindrical body for a spraying means, closed at the base terminal side, a rotary plate installed at an interval in the cylindrical body, a motor, a pump for force-feeding water to the rotary plate and a recovery hole for recovering the water of the cylindrical body are installed at an interval in a casing having a sucking opening and a discharging opening. Many protruded rows and through holes are formed at the center of a ring-shaped body installed at an interval in the cylindrical body and in the axial direction, and a belt ring part is installed in a site in the axial direction at the opened side of the ring-shaped body and having no protruded raw and through hole. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
