| 摘要 |
The invention relates to a filter device (1) and a filter element (8) for cleaning an air stream that is charged with particles. The filter element (8) comprises a bag-type filter sock (17) consisting of an air-permeable, flexible material and a support body (21) in the interior of the bag-type filter sock (17). The first axial end of said sock (17) is closed and the second axial end has an air outlet that allows the cleaned air stream to exit the filter sock (17). An inner diameter or inner periphery of the filter sock (17) is greater in cross-sectional areas between the air outlet and its closed first end, in particular at least 10 %, and preferably between 20 % and 40 % greater than the greatest outer diameter or outer periphery of the support body (21), such that the filter sock (17) is dimensioned in relation to the support body (21) contained therein that in the inactive state of the filter element (8) without air flow, said sock surrounds the support body (21) in a relatively loose manner and with lateral clearance. When air flows against the outer surface of the filter sock (17), folds or undulations are deliberately formed, at least in the jacket section of the filter sock (17), and the filter sock (17) thus lies comparatively closer to the support body (21). |
