AIR PURIFYING DEVICE

PURPOSE:To manufacture an air purifying device with small pressure loss and of good collecting efficiency by disposing an electret filter on the downstream side of a discharge section by means of guide rolls in the wavy form and rotating the guide rolls synchronized with a motor of a wind-up device. CONSTITUTION:An ionized zone is formed by flowing discharge current from a high voltage discharge line 2 to a polar-resistant set metal polar plate 3 and fine particles 24 passing through a prefilter 22 are charged to (+) when passing through the ionized zone to turn into charged particles 24' and collected to the (-) side of dipole polarizer of an electret filter 6. The pressure loss of air flow passing through the electret filter 6 is measured by a pressure sensor 17 and output to a pressure loss deciding means 18. When the pressure loss becomes the control pressure, a signal is transmitted from the pressure loss deciding means 18 to a motor control means 19 to start a motor 9 and deliver the electret filter 6 from a delivery section 8, transferred in the wavy form through guide rolls 10 and 11 and wound up in the given quantity in a manner that the flow upstream side forming the inside by a wind-up section 7.