Dust removal device

Abstract

A dust removal device is provided which reduces the differences, among different dusty environments, in time at which dust collection is started until the time when possible clogging may occur to significantly increase the time from the start of dust collection until the time when possible clogging occur, while improving dust removal performance. The dust removal device includes main filter 10 that is formed of non-woven cloth 8 with charged fiber, duct 6-1 with main filter 10 disposed therein, sub-filter 11 including a plurality of cylindrical air trunks formed of a charged member, and duct 6-2 with sub-filter 11 disposed therein. Duct 6-1 and duct 6-2 are in communication with each other. In operation, air flows from duct 6-1 to duct 6-2. Main filter 10 in duct 6-1 has a larger vent cross-sectional area than sub-filter 11 in duct 6-2.

Dependencies are inferred from the claim text.