| 摘要 |
<p>A filter comprises a filtering wall (2) which has a front face and a rear face and which is normally permeated by a medium in a direction from the front face towards the rear face such that the pollutants entrained by the medium are separated at the front face of the filtering wall and the purified medium is allowed to pass through the wall and into a space behind the filtering wall, the flow of medium through said wall being reversible, if so desired, in order to remove said separated pollutants from the front face of the filtering wall so as to clean said wall. According to the invention, the front face of the filtering wall is provided with one or more elastic cover elements (9) which are movable relative to the filtering wall and adapted upon reversal of the flow of medium, by elastic deformation under the action of said flow, to be removed wholly or partly from the wall while working said separated, adhering pollutants in order to facilitate the removal thereof.</p> |
