JPS61209061A - Hepa filter utilizing surface charge of minute suspended dust and bacteria - Google Patents

Abstract

PURPOSE:To collect extremely fine suspended dust and bacteria with high effi ciency and to prevent clogging, by applying a conductive substance to the separa tor of a HEPA filter to use the same as an electrode separator. CONSTITUTION:Each of separators formed by applying a powdery conductive substance to both surfaces of an aluminum plate, paperboard or a plastic plate and both of them are used as electrode separators 3, 6. All of the inlet side electrode separators 3 are connected to conductors 4 to be made positive while all of outlet side electrode separators 6 are connected by conductors to be made negative and DC voltage is applied between both electrode separators 3, 6 from an external DC power source through a terminal 7 to collect fine particles passing through this filter. Because the greater part of particles entering the filter are adhered to the electrode separators 3, 6, the clogging of a filter material 2 is prevented.

Description

[Detailed Description of the Invention] Current filters for the purpose of collecting fine particles have a shape in which the filter medium is waved and a separator is incorporated between the filter mediums, as shown in Figure 2, in order to widen the filtration area as much as possible. The filter medium is used to collect fine particles. Among these filters, the HEPA filter has the best collection ability, with a particle collection efficiency of 99.999% of 0.12 μm.
However, the purpose of this filter is to highly efficiently capture smaller airborne dust and microorganisms, while at the same time preventing the filter from clogging and extending its service life.

This filter uses a conductive material (such as a conductive material powder coated on both sides of an aluminum plate, cardboard, or plastic plate) as part of the separator of current filters, especially HEPA filters, as shown in Figure 4, and serves as an electrode and separator. 4
A DC voltage (500V to 600V) is applied between the two electrodes, with the inlet side in FIG. 3 being positive (H) and the outlet side in FIG. 4 being negative H.

In addition, all inlet side electrodes and separators are connected to the conductor wire in Figure 4.
Connect as shown in the figure and apply a positive (+) voltage to all the electrodes and separators.Also, the exit side electrodes and separators are connected with a conductive wire using a silkworm as shown in Figure 4, just like the artificial side electrodes and separators. to be applied. The applied voltage is from an external DC power supply as shown in Figure 4.5.
and 7 terminals.

Particles entering the filter are attracted to the electrodes by their own surface charges, and are collected by the electrode-cum-separator. Therefore, even smaller particles that cannot be captured by conventional filters can be captured electrically. In addition, smaller particles that cannot be collected by the filter's filter material and adhere to the electrode may combine with the electrode and become a large mass that is dispersed from the electrode. be captured. Furthermore, many of the particles that enter the filter adhere to the electrode/separator, which prevents clogging of the filter material and is extremely effective in extending the life of the filter.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional HEPA filter. FIG. 2 is a cross-sectional view of FIG. 1. FIG. 3 is a perspective view of a HEPA filter according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of FIG. 3.

Claims (1)

[Claims] In a HEPA filter, a conductive material is used for the separator inserted between the filter media, and the separator doubles as an electrode.The inlet side electrode and separator is positive (+), the outlet side electrode and separator is negative (-), and a DC voltage is applied between both electrodes. A filter that uses the surface charge of floating dust and microorganisms to collect these particles on an electrode.