JPS6159768B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a filter for air conditioning systems used in air purifiers, ventilation ducts, etc., which can be easily and strongly integrated while maintaining the performance of dust removal and gas removal filters. This provides a filter that can.

For example, in an air purifier that uses a dielectric filter for dust removal and a filter made of fibrous activated carbon for gas removal, if needle punching is used to create the filter, the performance may be significantly reduced depending on the method used. was coming. This state will be explained with reference to FIG. In FIG. 1, dust enters through the intake port 101 and the discharge wire 10 in the charging section 102
The dielectric filter 106 in the filter section 105 removes dust, the fibrous activated carbon 107 removes odors, and the gas removal substance 108 removes NOx, SOx, etc. The acid gas is removed and discharged as clean air from the exhaust port 112 to the outside of the casing 113 by the blower 111. 109 is a breathable base fabric for needle punching, and 110 is a frame to which the filter portion 105 is attached.

In the case of this type of air purifier, charged dust gradually accumulates on the dielectric filter 106, and the electrical potential on the surface of the dielectric filter 106 increases accordingly. Dust collection efficiency decreases. For this reason, it is common to use conductive material such as wire mesh on the back side of the dielectric filter.
As described above, the conductive fibrous activated carbon filter 107
and ground this, and connect the dielectric filter 106
The dust collection efficiency is maintained by releasing the potential at a certain level.

However, by needle punching, the filter part 105
In order to integrally configure the dielectric filter 106
If needle punching is performed from the side of the air permeable base fabric 109 for needle punching, the structure of the filter will be stronger and the filter will be easier to manufacture than by needle punching from the side. However, at the same time, the fibrous activated carbon filter 107 is also exposed to the surface of the dielectric filter 106, and the surface of the dielectric filter 106 has an apparent reduction in inductivity, and dust is removed by electrostatic induction. This will interfere with the adsorption mechanism.

The decrease in efficiency at this time is a flow rate of 1.1 [m ³ /min],
In an air purifier with a discharge current of 70 [μA] and a discharge voltage of 6.5 [kv], from the values of inlet concentration A and outlet concentration B,
Expressing the efficiency as η=(1-B/A)×100 [%], η= for the case where needle punching is not performed and the case where needle punching is performed from the base fabric side, respectively.
48 [%] and η = 31 [%], which became a problem in filter creation.

The present invention solves the above-mentioned drawbacks, and one embodiment thereof will be described below with reference to the drawings.

In Figures 2 to 4, reference numeral 1 denotes an air intake port that takes in dust-containing air from the air purifier, and the dust is removed from the charging section 2.
The charged dust is charged by passing through the ions emitted from the discharge wire 3 towards the counter electrode 4, and the charged dust is captured by the dielectric filter 6 of the filter section 5.
Odors are captured by the fibrous activated carbon 7, and NOx and SOx are adsorbed by the gas removal material 8. Reference numeral 9 denotes a breathable base cloth necessary for integrating the dielectric filter 6, activated carbon filter 7, and gas removal substance 8 by needle punching, and these are housed in a frame 10. The air purified by the filter section 5 is discharged to the outside of the casing 13 of the air purifier through the exhaust port 12 by the blower 11.

In FIG. 5, 14 shows a cross section of the filter layer integrated by needle punching, and 15 is the fiber fed from the breathable base fabric 9 toward the dielectric filter 6 by the needle punching. A multilayer filter is integrated. Here, the dielectric filter 6 has a basis weight of 100 g/m ² or more.

When charged dust is captured on the surface of the dielectric filter 6, the apparent permittivity of the surface of the dielectric filter is important as described above. In particular, since needle punching is performed from the side of the breathable base fabric 9, the fibers of the fibrous activated carbon filter 7 are also fed between the dielectric filters 6 together with the fibers of the breathable base fabric 9. However, since the basis weight of the dielectric filter 6 is 100 g/m ² or more, the amount of fibrous activated carbon fibers that penetrate to the surface of the dielectric filter is reduced. In other words, since the fibrous activated carbon 7 has gone through an activation process, its strength is very weak compared to the general polyester, polypropylene, etc. of the dielectric filter 6 and the breathable base fabric 9. Since the layer 6 has become thicker due to the increased basis weight, even if the fibers of the fibrous activated carbon filter 7 are needle-punched at the same time, they will hardly reach the surface of the dielectric filter 6, resulting in substantial collection. The reduction in dust efficiency is very small. When compared under the same conditions as the conventional example, the value is as shown in Figure 6, and it is generally believed that if the basis weight of the dielectric filter 6 is set to 100 g/m ² or more, the substantial decrease will be minimized. Very useful for creating filters.

As described above, according to the present invention, when integrating by needle punching, the amount of the fibers of the fibrous activated carbon filter reaching the surface of the dielectric filter is extremely small, and the substantial decrease in dust collection efficiency can be minimized.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an air purifier, Fig. 2 is a sectional view of an air purifier using the filter of the present invention, Fig. 3 is a perspective view of the filter section, Fig. 4 is a partially exploded perspective view of the filter, and Fig. 5 is a sectional view of the air purifier using the filter of the present invention. A cross-sectional perspective view of the filter, and FIG. 6 is a characteristic diagram of area weight vs. dust collection efficiency. 5... Filter portion, 6... Dielectric filter, 7... Fibrous activated carbon filter, 9... Air permeable base fabric. 〓〓〓〓

Claims (1)

[Claims] 1. A multilayer filter consisting of a dielectric filter with a basis weight of 100 g/m2 or ^more , fibrous activated carbon, and a breathable base fabric arranged in the above order was integrated by needle punching from the breathable base fabric side. A filter characterized by: