| 摘要 |
<p>A grain bin is provided having a roof, and a perofrated floor. A chamber, e.g. a grain storage chamber is provided above the floor, and a chamber, e.g. a plenum chamber is provided below the floor. Air circulatory means, e.g. a fan, is connected to the grain bin for forcing air under pressure into one of the chambers, e.g. the plenum chamber, through the floor and ultimately to be exhausted through the other chamber,e.g. the grain storage chamber. A ventilation structure is attached to the roof of the bin in direct communication with the top of the grain storage for modulating the flow of air exhausting from the grain storage chamber. The ventilation structure may be broadly described as being means rotatably attached to the bin and encompassing the opening for modulating the flow of air exhausting out of the other chamber, the modulating means having a substantially horizontally disposed fluid impervious central plate member for substantially preventing precipitation from entering the bin and a plurality of spaced turbine-shaped blades connected to the central portion and extending downwardly therefrom. The plurality of turbine shaped blades are fixed together and are mounted for free-spinning rotation with respect to the roof. In this way the static heat can be removed from under the grain bin roof. Grain is aerated and is dry stored with a minimum use of energy.</p> |
