Patent EA-003891-B1 (EA)
Title: Filter for inflammable dry bulk freight
Inventor: THORWESTEN ALBERT
IPC: B01D46/42
Filed: 2001-03-15
Abstract: 1. A filter for inflammable dry bulk materials comprising a substantially cylindrical wall, a lid, a dry bulk material feeding and discharging system, as well as a pressure relief element opening at a predetermined pressure rise in the container, in particular with an explosion door and filter elements associated with the container, characterized in that at least one pressure relief element (17) is arranged in the container lid (4) particularly in the center area, whereby the chamber of the container is limited below the at least one pressure relief element (17) by a tubular element (3) that is arranged substantially vertically in the container (2) and into which the tubular dry bulk material charging system (9) is feeding. 2. The filter according to claim 1, characterized in that the filter elements (6) are arranged in the area between the tubular element (3) and the outer wall of the container. 3. The filter according to claim 1 or 2, characterized in that below the area receiving the filter elements, the container (2) has the shape of a funnel (2a). 4. The filter according to claim 3, characterized in that the tubular dry bulk material feeding system (8, 9) enters the funnels-shaped area (2a) inclined versus the vertical, and in the vertical position feeds into the tubular element (3) in the center. 5. The filter according to claim 1 or any one of the succeeding claims, characterized in that provision is made for a container lid (4, 4') embodied as a sandwich construction, in particular that the container lid (4) has an upper lid layer and a lower lid layer (14, 15), said layers being connected with upwardly tapering, funnel-shaped lid elements (16) or inclined metal sheets (28, 29) extending all around, whereby, if necessary, the upper and the lower lid layers (14, 15) have recesses along which the lid layers (14, 15) are connected all around with the lid elements (16). 6. The filter according to claim 5, characterized in that the funnel-shaped lid elements (16) extend up to outside of the upper lid layer (14). 7. The filter according to any one of the preceding claims, characterized in that in the center of the lid, provision is made for an outwardly and upwardly tapering, truncated cone-shaped area (26a) projecting beyond the upper layer of the lid, said area being surrounded by concentric, inclined sheet metal strips (28, 29), in such a way that a triangular framework is formed in the lid viewed in the cross section. 8. The filter in particular according to claim 7, characterized in that the lid is equipped with a vertical, straight outer edge wall (31) and/or that a strip of sheet metal forming a right-angled triangle is secured on the outer edge wall (31), said strip of sheet metal expanding the upper lid layer outwards and extending all around. 9. The filter according to any one of the preceding claims, characterized in that the central truncated cone supports an explosion door or a filter head. 10. The filter according to any one of the preceding claims, characterized in that the explosion door is eccentrically arranged on the lid.