| 摘要 |
PROBLEM TO BE SOLVED: To prevent the rescattering of dust particles from a dust collecting electrode and to make the cleaning of the dust collecting electrode easy in an electrical precipitator for air purification. SOLUTION: DC high voltage V is applied between a dust collecting electrode 11 and counter electrodes 13, 15 to collect charged dust particles on the dust collecting electrode 11. The dust collecting electrode 11 is formed of a metal net to form an unequal field near the surfaces of the dust collecting electrode. The smaller a radius R of the net wire of the metal net is, the better. It is desirable that a distance L between the adjoining net wires is sufficiently narrow so that there may exist no clearance in which the unequal electric field is not formed. Practically, it is preferable that R<=0.1mm, and L/R=2∼4. Furthermore, the surface of the dust collecting electrode 11 is covered with a thin insulating film to make the shape of the surface smooth. It is preferable that the insulating film has volumetric resistance of >=10<8>Ωm and its specific inductive capacity is smaller than that of the electrode material and is <=10. The thickness of the insulating film is made equal to or smaller than the radius of the net wire. Instead of the metal net, a metal plate provided with a lot of projecting parts and slits and a printed circuit board having lattice-shaped printed wiring may be used.
|
