| 摘要 |
<p>PURPOSE:To improve initial collection efficiency by mounting a charge part on the upstream side while mounting an electret filter on the downstream side and providing parallel electrode plates on the upstream side of the electret filter. CONSTITUTION:High voltage is applied to high voltage discharge wires 2 by a high voltage power supply 4 to form ionizing regions. Coarse particles 11 are removed by a predetermined filter 10 and the fine particles 12 passed through said filter 10 are charged with electrons or ions discharged in the ionizing regions to become charged particles 12'. When the charged particles 12' approach an electret filter 6, said charged particles 12' are attracted to the bipolar polarizers of the electret filter 6 on the negative side thereof by electrostatic force to be collected by said filter 6. When high voltage is applied to the high voltage discharge wires 7 on the upstream side of the electret filter, the charged particles 12'. are further collected by electrostatic force. By this constitution, collection efficiency is enhanced and pressure loss is reduced.</p> |
