Filter

• Main Authors: LASLO HENRY JOSEPH, STEWART JAMES MORRISON, PASHAIAN SARK, MCGREW ORLAN, JUN. FREDERICK WILLIAM KOEPKE, UMBRICHT EMIL
• Format: Patent
• Language: German
• Published: 07.03.1968
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

1,109,251. Moving band filter. AJEM LABORATORIES INC. 13 April, 1965 [16 April, 1964], No. 15834/65. Heading B1D. A travelling band filter comprises a filter web 26 entrained round a rotary drum 20 in a tank of unfiltered liquid, the drum and web being carried by a frame 68, pivoted at 70 so that it may be lifted out of the liquid, the interior of the drum communicating witha filtrate suction pump 52 through a seal comprising flanges 72, which are urged together by the weight of the frame and drum alone. In Fig. 1, the web 26 is disposable, fed from roll 28 round roll 30, drum 20, roll 62 and up ramp 34. Scrapers 38 engage the medium and solids fall to the bottom of the tank and are removed by endless scraper conveyor 40. The two chains of conveyor 40 are driven by a motor 64 and engage peripheral teeth on drum 20. Rolls 30, 62 are driven off the drum and so are the chains 37 of a second endless conveyor which lifts the used web up ramp 34. The interior of drum 20 above the liquid level is closed by arcuate baffle 74. In Figs. 2 to 11 (not shown), an endless filter band is cleaned by reverse flow gas from fixed nozzle (112) and is held against the drum by the bars linking the two chains of an endless conveyor which rotates the drum. Filter cake breaks from the band where it passes over upper roll 120. movable to adjust tension. An external double ramp sealingly engages the upper part of the drum and guides the band on and off the drum. The filter web may be of nylon or glass fibre and may drive the drum directly, without any conveyor being used. A nylon cloth web may have pockets therein containing reinforcing cross members.