| 摘要 |
<p>1,259,557. Air filter. BUHLER A.G. GEB. 11 June, 1969 [20 June, 1968], No. 29692/69. Heading B1T. [Also in Division F2] Inward-flow filtering bags or tubes 7 are arranged on two pitch circles and in alignment with respective nozzles 12, located in chamber 4 to which compressed air is supplied for reverse flow cleaning, an axle 6 being rotated by motor 27 and carrying an arm 29, which brings a sleeve 31 into line with each tube 7 and its nozzle 12 in turn, and an arm 32 which simultaneously opens a valve 14 at the top of that nozzle 12 to allow a blast of compressed air to pass from vessel 4 into nozzle 12 and through sleeve 31 into the corresponding tube 7. Fig. 2 (not shown) illustrates a valve 14, which incorporates a fixed cam (38) up which a hammer 37, connected to arm 32 by leaf spring 36, slides as the arm rotates, to descend suddenly on valve head 21, which opens auxilliary valve 19 momentarily to connect space 16 with filtered air chamber 3, whereupon the pressure in chamber 4 raises diaphragm 13 to allow air into the top of nozzle 12. Holes (13') and springs 22, 23 quickly close the valves again.</p> |
