Electrostatic filter dust collector

DETAILED DESCRIPTION 1.
Field of the Invention This invention relates to an electrostatic filter dust collector for use in cleaning dust-containing air and a dust-containing gas.
2.
Prior Art There is a conventional electrostatic filter dust collector using in its dust collecting section a filter medium which consists as shown in FIG.
1 of a filter member 1 of glass fiber folded so as to form ridge portions 2, 3 at the upstream and downstream portions thereof with respect to a direction in which a dust-containing gas flows, and spacers 4, 5 inserted between the opposed surfaces of adjacent ridge portions 2, 3 from the upstream side and downstream side thereof.
If the width d.
sub.
1 of the fold of this filter member 1 is reduced, it becomes difficult to keep the filter member 1 and the spacers 4, 5 in the accurate folded position and the accurate inserted positions, respectively, during the assembling of the dust collecting section.
This imposed restrictions on the miniaturization and thickness-reduction of the dust collecting section of the filter dust collector.
If the distance d.
sub.
2 between the adjacent ridge portions 2, 3 is reduced, the percentage of the contacting area of the spacers 4, 5 with respect to the filter member 1 increases, so that the dust collecting area of the filter member 1 decreases accordingly.
3.
Object of the Invention An object of the present invention is to provide an electrostatic filter dust collector which has smaller dimensions including the thickness and a higher dust collecting efficiency than the above-described conventional electrostatic filter dust collector.
Another object of the present invention is to provide an electrostatic filter dust collector which is used as a high-performance filter for clean benches, clean tunnels and clean zone units, and an air cleaner.