Filter element with granulated filter material - has spherical, prismatic or semi-cylindrical shells on inlet surface increasing area without increasing space occupied

摘要

A filter element is formed of cells placed side by side. Each cell has two walls permeable to the fluid being filtered. One wall is turned towards the feed and constitutes an inlet surface. The other wall is an outlet surface. The walls are each made of a sheet of non-woven fabric. The sheets are joined to one another and enclose between them a granular filter material. The inlet wall of each cell has the shape of a spherical, prismatic or semi-cylindrical shell. The invention provides a way of increasing the inlet surface, without increasing the space occupied. this is partic. important in the case of cartridge or candle filters because the inlet surface of such filters is very much reduced in relation to the mass of filter material, partic. when the fluid enters along the longitudinal axis. In addn., the invention makes possible the realisation of cartridges or candles of different diameters from the same band of contiguous filter cells.