Filtering device

A device for filtering a moving gaseous atmosphere in an installation for unloading pulverulent products in bulk, the installation being of the type constituted by a supply sleeve connecting the base of a silo or hopper to the circular filling orifice of a mobil container, wherein it is constituted by a central, tubular, discharge bushing extending the base of the sleeve, said bushing adapted to be engaged in the filling orifice of the container, and said bushing being associated with an outer cone which is concentric to said bushing and adapted to rest with self-centering on the edges of said orifice thus obturated, the cone being closed at its summit by a horizontal wall except for an annular space therein around said bushing, the annular space comprising an evacuation opening, and the annular space defined between said bushing and the outer cone constituting a volume for decantation of the gaseous phase, particularly the air laden with solid particles in suspension and driven from the inner atmosphere of the container, this decantation volume communicating with the volume of the container being filled, and where the dust is developed, by a lower annular passage between the base of the outer cone and the base of said bushing, and this decantation volume internally comprises a plurality of walls forming baffles, defining a path of the laden air between the lower inlet passage and said upper evacuation opening, comprising a plurality of changes of direction, and said bushing comprises openings for communication with said decantation volume, these openings cooperating with said walls forming baffles in order to allow the particles decanted in the volume and recycled with the poured materials, to be recovered.