JPS6159770B2 - - Google Patents

Description

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

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 an intake port 101 and is charged with ions emitted from a discharge wire 103 in a charging section 102 toward a counter electrode 104.
The dielectric filter section 106 in the dust collection section 105 removes dust, the fibrous activated carbon filter section 107 removes odors, and the gas removal substance 108 removes acid gases such as NOx and SOx. Clean air is discharged outside the casing 113 from the exhaust port 112. 109 is a breathable base fabric for needle punching, and 110 is a frame of the dust collecting section 105.

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, causing the dust to gradually accumulate. Dust efficiency is reduced.

For this reason, generally, a conductive material such as a wire mesh or a conductive fibrous activated carbon filter 107 as described above is applied to the back surface of the dielectric filter 106 and grounded to keep the potential of the dielectric filter 106 constant. It is designed to emit dust at a high level to maintain dust collection efficiency.

However, in order to integrally configure the dust collecting section 105 by needle punching, it is better to perform needle punching from the side of the breathable base fabric 109 for needle punching than from the dielectric filter 106 side. , the structure of the filter becomes strong, and the filter is easy to create. However, at the same time, the fibrous activated carbon filter 107 is also pushed out to the surface of the dielectric filter 106, causing the
The surface apparently has a reduced dielectric constant, which impedes the mechanism of attracting dust by electrostatic induction.

The decrease in efficiency at this time is a flow rate of 2.5 [m ² /min],
In an air purifier with a discharge current of 120 [μA] and a discharge voltage of 7.0 [KV], the efficiency shown by the values of inlet concentration A and outlet concentration B is expressed as η = (1-B/A) × 100 [%]. η for those without needle punching and those with needle punching from the base fabric side, respectively.
= 80 [%] and η = 50 [%], which became a problem in filter creation.

The present invention solves the above-mentioned drawbacks by sandwiching fibrous activated carbon and a gas removal substance between a dielectric filter and a breathable base fabric, or between a breathable base fabric and a breathable base fabric, and inserts needles from at least the side of the breathable base fabric. Punching is performed to integrate them, and another dielectric filter is stacked on the side opposite to the needle punch side of the integrated filter, and needle punching is performed from the other dielectric filter side to integrate them. .
An embodiment thereof will be described below based on 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 toward the counter electrode 4, and is captured by the dielectric filters 6, 6' of the dust collecting section 5.
The fibrous activated carbon filter 7 captures odor, and the gas removal substance 8 adsorbs NOx and SOx. Reference numeral 9 denotes a breathable base cloth necessary for integrating the dielectric filters 6, 6', the activated carbon filter 7, and the gas removal substance 8 by needle punching, and these are attached to the frame 1.
It is stored in 0. The air purified by the dust collecting 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 a filter layer in which 6', 7, 8, and 9 are integrated by needle punching, and 15 shows a dielectric layer formed by needle punching in the a direction from the breathable base fabric 9. The fibers are fed towards the filter 6' and are now integrated. Furthermore, in order to integrate these with the dielectric filter 6, the dust collecting portion 5 made of a multilayer filter is formed by stacking the filter on the dielectric filter 6' and needle punching in the b direction from the dielectric filter 6 side.

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. Especially fibrous activated carbon filter 7
Since the fibers of the fibrous activated carbon 7 are needle-punched from the air-permeable base fabric 9 side, the fibers of the fibrous activated carbon 7 are also needle-punched from the air-permeable base fabric 9 side.
The fibers are sent between the dielectric filters 6'.

However, by stacking another dielectric filter 6 on top of the dielectric filter 6' and performing needle punching from the dielectric filter 6 side, the fibers of the dielectric filter 6 enter the air-permeable base fabric 9 side and are integrated. Therefore, even if the fibers of the fibrous activated carbon filter 7 are fed onto the surface of the dielectric filter 6', the dielectric constant does not decrease at all, and there is no decrease in dust collection efficiency, achieving a high performance of about 80%. filter can be obtained.

Incidentally, when the fibrous activated carbon filter 7 and the gas removal substance 8 are integrated by needle punching, the breathable base fabric 9 may be applied to both sides.

As described above, according to the present invention, since the fibers of the fibrous activated carbon filter do not appear on the surface of the dielectric filter, the dielectric constant does not decrease, and therefore the dust collection efficiency of the filter does not decrease at all. In addition, 500V
When we measured the insulation resistance between the fibrous activated carbon filter and the dielectric filter using an insulation resistance tester, it was over 100MΩ, which was conventionally completely conductive, confirming its superiority.

[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, and Fig. 3 is an explanatory diagram of an air purifier.
4 is a partially exploded perspective view of the filter, and FIG. 5 is a sectional perspective view of the filter. 5... Dust collecting section, 6, 6'... Dielectric filter, 7...
Fibrous activated carbon filter, 9...Breathable base fabric. 〓〓〓〓

Claims (1)

[Claims] 1. A method for manufacturing a multilayer filter in which a dielectric filter, fibrous activated carbon, a gas removal substance, and a breathable base fabric are integrated by needle punching, the method comprising integrating the fibrous activated carbon and gas removal substance into a dielectric filter and a breathable base fabric. Alternatively, sandwich the air-permeable base fabric with air-permeable base fabric, perform needle punching from at least the air-permeable base fabric side to integrate, and then stack another dielectric filter on the side opposite to the needle-punched side of the integrated product. A method of manufacturing a filter in which needle punching is performed from the other dielectric filter side to integrate the filter.