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    • 1. 发明专利
    • Filter with means for retarding cake formation
    • GB2383001A
    • 2003-06-18
    • GB0129700
    • 2001-12-12
    • CHANG SHIH-CHANG
    • CHANG SHIH-CHANG
    • B01D29/11B01D29/86B01D29/35
    • A filter unit with inside-out flow though a cylindrical filter element 3 has a diffuser 41 inside the filter element to induce a cross-flow of raw fluid across the inside surface of the filter element to retard cake deposition, and so prolong operational time between cleaning sessions. The diffuser 41 is a body housing a flowpath with a reducing section 410, a throat section 411 and an expanding section 412. As fluid enters through inlet 61, low-pressure and high pressure areas are produced at the inlet 413 and outlet 414 respectively of the diffuser to create a cross-flow 5 in the gap D between the filter element 3 and the diffuser 41. This prevents particles settling on the inside of the filter element and allows filtrate to pass through the filter element to the outlet 62 for a longer time before clogging. The inlet 61 may have a nozzle (610, Fig 4) to increase flow velocity into the unit. In Fig 5, the cross-flow between the diffuser 110 and the filter element 13 follows a spiral path along fins 112. The diffuser may also carry brushes on the tips of the spiral fins 112 and be rotated by fluid flow to keep particles away from the filter surface.