JPH057797A - Air purifier - Google Patents

Abstract

PURPOSE:To make it possible to reduce a noise level, create a large air blow and minimize pressure loss 15 providing a dust ionization part using corona discharge, a sheet-like electolet filter for collecting dust and a deodorizing filter bearing an absorbent in the cubic woven cage. CONSTITUTION:Air sucked from an air intake aperture 1 is allowed to pass through, first, a prefilter 5 for large-size dust removal. Then, fine dust or smoke is positively charged due to corona discharge from a discharge line 6 and then is caught by an electolet filter 8. After that, a gaseous portion such as odor is adsorbed by the adsorbent 25 of a deodorizing filter A which bears the adsorbent 25 in the cubic woven cage 21, while a purified air is bled by way of an air blowout aperture 2. Thus a large amount of adsorbent can be borne and pressure loss can be minimized.

Description

Detailed Description of the Invention

[0001]

[Industrial application] The demand for dust collection and deodorization in general households has become stronger year by year, and there are demands for cigarette smoke and odor removal, pet and toilet odor removal, house dust removal, etc. It is increasing in proportion to the improvement of the temperature and the spread of air conditioning equipment.

The present invention provides a low pressure loss,
The present invention relates to a highly efficient air purifier.

[0003]

2. Description of the Related Art Generally, an air purifier used indoors or in a vehicle is required to efficiently remove relatively low-concentration dust and odor, and it is necessary to efficiently collect dust such as HEPA filter, electrostatic filter, and electric dust collector. It has been put to practical use by combining a part and an activated carbon packed bed. In order to improve the purification efficiency, it is important to increase the efficiency of one pass and increase the air volume to accelerate the circulation.

Among the above-mentioned methods, there are the following air purifiers with low pressure loss, high efficiency, and simple maintenance. It is an ionization part of dust by corona discharge, a sheet-shaped electret filter for collecting dust, an adsorbent such as crushed activated carbon in the cells of the honeycomb substrate, and both sides of the honeycomb substrate. It is an air purifier consisting of a deodorizing filter made by bonding non-woven fabrics together.

Regarding the configuration of the above deodorizing filter, FIGS.
This will be described with reference to 1. The honeycomb-shaped substrate 51 is a honeycomb-shaped substrate made of a thin aluminum plate or kraft paper cured with a phenolic resin or the like. Then, the adsorbent 52 is put in the cells 55 of the honeycomb-shaped base material 51, and the non-woven fabric 53 is bonded to both surfaces thereof by the web-like adhesive sheet 54.

[0006]

However, in the air purifier having the deodorizing filter, since the fine particles are usually contained as the adsorbent 52 inside the filter, the non-woven fabric 53 is also included.
However, there was a drawback that the pressure loss was high and the efficiency was poor.

The present invention is intended to solve the above-mentioned problems.
The purpose of is to reduce the pressure loss in realizing an air purifier with low noise and large air volume, and the second purpose is
In addition to the above-mentioned purpose, it is to provide an inexpensive and highly safe air purifier, and the third purpose is to provide an air purifier with low pressure loss and low noise.

[0008]

In order to achieve the first object, the air purifier of the present invention comprises an ionization part of dust by corona discharge, a sheet-shaped electret filter for collecting dust, The three-dimensional knitted fabric has a deodorizing filter carrying an adsorbent. In order to achieve the second object, it has a folding type melt blown electret filter for collecting dust and a deodorizing filter in which an adsorbent is carried on a three-dimensional knitted fabric. In addition, in order to achieve the third purpose,
It has an ionization part of dust by corona discharge, a wound film electrode for collecting dust, and a deodorizing filter in which an adsorbent is carried on a three-dimensional knit.

[0009]

The present invention has the ionization section, the sheet-shaped electret filter for collecting dust, and the deodorizing filter in which the adsorbent is carried on the three-dimensional knitted fabric according to the above-described first structure, and therefore a large amount of adsorption is achieved. An air purifier that can carry an agent and has a small pressure loss can be provided.

Further, according to the second structure, since the fold type melt blown electret filter and the deodorizing filter in which the adsorbent is carried on the three-dimensional knit are provided, even if there is no ionization part of dust due to corona discharge, a low pressure loss occurs. Dust collection efficiency is also high. Therefore, there is no danger of danger due to high voltage.

Further, according to the third structure, an ionization section,
An air purifier that has a wound film electrode that collects dust and a deodorizing filter that supports an adsorbent on a three-dimensional knit, has a significantly lower pressure loss than the filter method, has a high dust collection efficiency, and has a low noise level. Can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In the figure, 1 is an air inlet of an air purifier, 2 is an air outlet, 3 is a control part, 4 is a jig for setting a filter, and an electret filter 8 and a deodorizing filter A are set as shown in the figure. . Reference numeral 5 is a pre-filter for removing large dust in the air, 6 and 7 are discharge lines for ionizing smaller dust in corona discharge and its counter electrode, both of which constitute a dust ionization section. The electret filter 8 is in the form of a sheet that collects dust. 9
Is a motor, 10 is a fan unit, and 11 is an air flow path.
Reference numeral 12 is a body of the air purifier.

The electret filter 8 is a non-woven fabric of electretized polypropylene fibers having a thickness of about 10 μm and a width of about 38 μm, and a basis weight of about 150 g / m ² . The dimensions are 454 mm in width × 302 mm in length.

As shown in FIGS. 3 to 5, the deodorizing filter A has a three-dimensional knit 21 made of polygonal mesh cells as a base material. The three-dimensional knit 21 is made by connecting polygonal nets 22 and 23, which are knitted with twisted yarn, in parallel with a connecting yarn 24. Here, the polygonal nets 22 and 23 on the front and back sides are made of polyester twisted yarn, and the connecting yarn 24 is made of nylon single yarn. The cell size is generally expressed by the l ₁ and l ₂ sizes, and the l ₁ , l ₂ size and the c size greatly affect the performance of the filter. That is, the adsorbent 25 such as activated carbon to be used
The optimum size is set according to the amount of pressure and the allowable pressure loss. Generally, it is desirable that the l ₁ and l ₂ dimensions are 1.5 mm to 10 mm and the c dimension is 1.5 mm to 10 mm. Where l ₁ is 2.5
Three sheets having mm, l ₂ of 4.5 mm and c of 3.0 mm were used. The deodorizing filter A has such a three-dimensional knit 21
The nets 22 and 23 and the connecting yarn 24 carry an adsorbent 25.

As the adsorbent 25, one kind or two or more kinds selected from activated carbon, zeolite, silica gel, activated alumina, or those obtained by impregnating these with a chemical having an effective odor is used. The particle size of the adsorbent 25 is 24 m
Less than esh is desirable, but here 100mes
Coconut shell activated carbon having a specific surface area of about 1100 m ² / g (BET method) at h or less was used. The solid knitted fabric 21 was impregnated with a mixture of about 80 parts by weight of the coconut shell activated carbon and about 20 parts by weight of a binder made of rubber latex and carboxymethyl cellulose (CMC), and then dried. The weight per unit area of the activated carbon after drying was about 639 g / m ² . Here, one of these is 14
It was dipped in a solution of 6 parts by weight of ferrous sulfate and dried. This filter is impregnated with about 38% by weight of malic acid + ferrous sulfate. After that, aniline gas was adsorbed so that about 6.5% by weight of aniline was impregnated on all the three filters.

The deodorizing filter A thus obtained is
The width is 454 mm, the length is 302 mm, the thickness is about 9 mm, and the amount of the adsorbent 25 is about 300 g. The conductivity of the deodorizing filter A is about 15 KΩ / 30 cm, and it also serves as an electrode during electrostatic dust collection and enhances the electrification of the electret filter 8.

The operation of the air purifier in the above structure will be described. The rotation of the fan unit 10 causes the air suction port 1 to move.
Larger dust is first removed by the pre-filter 5 from the more sucked air. Then, fine dust and smoke are positively charged by the corona discharge of the discharge line 6 and are caught by the electret filter 8. After that, gas components such as odor are adsorbed by the adsorbent 25 of the deodorizing filter A, and the purified air flows out from the air outlet 2.

Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, there is no discharge line for ionizing dust or a counter electrode, but a fold type melt blown electret filter 31 for collecting dust is used. The melt blown electret filter 31 is a non-woven polypropylene fiber which has a diameter of 2 to 3 μm and is electretized by the melt blown manufacturing method, and has a height of 25 mm and a pitch of 5 mm as shown in FIG. It is processed into a folded shape of 0.5 mm, and the periphery is shaped by a thick non-woven frame plate 32. The basis weight of the non-woven fabric is about 60 g / m ² . Dimensions are horizontal 4
It is 54 mm × length 302 mm. In addition, deodorizing filter A
The other configurations are the same as those in the first embodiment.

The operation of the air purifier in the above structure will be described. The rotation of the fan unit 10 causes the air suction port 1 to move.
Larger dust is first removed by the pre-filter 5 from the more sucked air. Then, fine dust and smoke are melt blown by the filter effect of the ultrafine fiber and the electret effect.
It is captured by the electret filter 31. After that, gas components such as odor are adsorbed by the adsorbent 25 of the deodorizing filter A, and the purified air flows out from the air outlet 2.

Next, a third embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. The air purifier of this embodiment is roughly divided into three parts. First one is
Discharge wire 4 for corona discharge that ionizes small dust 4
1 (anode) and its counter electrode 42. Next, it is a winding type film electrode composed of the dust collecting electrode 43, the counter electrode 44 thereof, and films 45 and 46 for insulating them. The dust collecting electrode 43 and the counter electrode 44 are made of aluminum foil, and the films 45 and 46 are made of polyethylene. The dimensions of the wound film electrode, which is the dust collecting portion, were 454 mm in width × 302 mm in length × 60 mm in depth. Next, there is a deodorizing filter A which is a deodorizing section. The configuration and other configurations are the same as those in the first embodiment.

The operation of the air purifier in the above structure will be described. The air sucked from the air suction port 1 by the rotation of the fan 10 is first subjected to pre-filter 5 to remove large dust. Subsequently, fine dust and smoke are positively charged by the corona discharge of the discharge wire 41 and are captured by the dust collecting electrode 43. After that, gas components such as odors are removed by the deodorizing filter A.
The air adsorbed by the adsorbent 25 and purified is discharged from the air outlet 2.

The characteristics of the air purifiers of the first, second and third embodiments described above and the conventional air purifier were compared. In the conventional air purifier, the dust collecting part is composed of the ionizing part and the electret filter as in the first embodiment, and the deodorizing filter is composed of the filters shown in FIGS. 9 to 11. In the deodorizing filter c in FIG. 11, the cell size 1 of the kraft paper is 12 mm, the thickness c ₁ is 7 mm, and the adsorbent 52 is 6 mesh to 12 mesh (about 4 mm to 2 m).
300 g of four kinds of crushed coal for m) for aldehyde, for ammonia, for sulfur compound system and for hydrocarbon were used. The non-woven fabric 53 is a fibrous non-woven fabric which is made of a thermoplastic resin such as polyester, acrylic, PP, PE, etc., and has a conductive weight of 30 g / m ² . The spider web adhesive sheet 54 was made of nylon having a basis weight of 16 g / m ² , and the size of the filter was 454 mm × 302 mm.

1. Deodorization performance (1) After spontaneously burning one cigarette (Seven Star) in a closed box of 1 m ³ , the air purifiers of the example and the comparative example were respectively operated to measure the gas concentration in the box with the FID detector. It was analyzed by gas chromatography and the decay curve was obtained. As a result, the time to decay to 1/100 was 10 minutes or less, which was very fast.

(2) Also, after using each air purifier in the living room of a cigarette smoker for 1 year, perform 1 in the same manner as in (1).
When the measurement was performed for 0 minutes, the removal rate was 85% or more, and it was found that the deodorizing ability was still sufficient.

2. Pressure loss, noise, and dust collection performance The pressure loss was evaluated by combining the dust collecting section and the deodorizing section at a wind speed of 8
It was measured at 0 cm / sec. The noise and dust collection rate were measured for each air purifier at an air flow rate of 3 m ³ / min.

The results are as follows.

[0027]

[Table 1]

As is clear from Table 1, the air purifiers of the present invention have lower pressure loss than the air purifiers of Comparative Examples.
It has low noise. In particular, the effect is remarkable in Example 3 of collecting dust by the winding type film electrode. Further, in the second embodiment, since there is no high-voltage ionization part, the safety is high and the air purifier can be constructed at low cost.

[0029]

As is apparent from the above embodiments, according to the air purifier of the present invention, the ionization part of dust by corona discharge, the sheet-like electret filter for collecting dust, and the three-dimensional knitted fabric It has a deodorizing filter carrying an adsorbent, and can carry a large amount of adsorbent and can reduce pressure loss.

Further, since it has a folding type melt blown electret filter for collecting dust and a deodorizing filter in which an adsorbent is carried on a three-dimensional knitted fabric, there is no high-voltage ionization part, so that the safety is high. The cost can be reduced.

Further, a low pressure loss type dust collecting part is used, which has an ionizing part of dust by corona discharge, a winding type film electrode for collecting the dust, and a deodorizing filter carrying an adsorbent on a three-dimensional knit. Therefore, it is possible to reduce the overall pressure loss, and it is possible to provide an air purifier having excellent dust collection efficiency and deodorizing performance, low noise, and a large air volume.

[Brief description of drawings]

FIG. 1 is a main longitudinal sectional view of an air purifier according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the air purifier according to the first embodiment of the present invention.

FIG. 3 is a partial sectional view of a deodorizing filter according to first to third embodiments of the present invention.

FIG. 4 is a partially enlarged plan view of a deodorizing filter according to first to third embodiments of the present invention.

FIG. 5 is a partially enlarged perspective view of a three-dimensional knitted fabric used for a deodorizing filter in the first to third embodiments.

FIG. 6 is a main longitudinal sectional view of an air purifier according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a melt blown electret filter according to a second embodiment of the present invention.

FIG. 8 is a main configuration diagram of an air purifier according to a third embodiment of the present invention.

FIG. 9 is a sectional view showing the basic configuration of a conventional deodorizing filter.

FIG. 10 is a partially enlarged cross-sectional view of the deodorizing filter in section D of FIG.

FIG. 11 is a partially enlarged perspective view of a honeycomb-shaped substrate in a conventional deodorizing filter.

[Explanation of symbols]

6,41 discharge line 7,42 Counter electrode 8 Electret filter 21 three-dimensional knitting 25 Adsorbent 31 Melt blown electret filter 43 Dust collection electrode A deodorizing filter

Claims (3)

[Claims] 1. An air cleaner having an ionization part of dust by corona discharge, a sheet-shaped electret filter for collecting dust, and a deodorizing filter having a three-dimensional knitted fabric carrying an adsorbent. 2. A fold-type melt blower for collecting dust.
An air purifier having an electret filter and a deodorizing filter having a three-dimensional knitted fabric carrying an adsorbent. 3. An air purifier having an ionization part of dust by corona discharge, a wound film electrode for collecting dust, and a deodorizing filter having a three-dimensional knitted material carrying an adsorbent.