Electrostatic particle filtration

Details Electrostatic particle filtration Electrostatic particle filtration

B - Operations, Transporting

03

C

183/49, 317/2.1

B03C 3/14 (2006.01) A47L 9/12 (2006.01) A47L 13/40 (2006.01) B03C 3/155 (2006.01) B03C 3/66 (2006.01)

Patent

CA 2036739

A vacuum cleaner is disclosed having an on-board electrostatic filtration device for removing ultra fine particles from the suction air stream which is dis- charged into the vacuum cleaner's dirt collection receptacle. The electrostatic filtration device includes a finely woven conductive mesh made from two electrically insulated sets of conductive filaments between which a low voltage electrical potential difference is applied. The polarity of the electrical potential difference is periodically reversed at low frequency to assist in maintaining filtering effective- ness notwithstanding the accumulation on the mesh of significant amounts of retained particulate matter. High permitivity material is incorporated between filaments to enhance electric fields in the mesh created by the electrical potential difference.

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