JPH1076180A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact air cleaner having a function for removing a harmful gas together with dust collecting function. SOLUTION: This air cleaner is provided with an ionizing unit and a dust collecting unit and a gas removing sheet 13 is agranged on the surface of a dust collecting electrode plate in the dust collecting unit. As the gas removing sheet 13 to be used, a sheet, which contains (a) a metal or metal oxide particle, (b) an adsorbent particle, (c) a thermoplastic resin particle and (d) a fibrous base material. of an air permeable shut and in which the particle (a) and the particle (b) are bonded with each other at the Contact part on the resin particle (c) surface and the resin particle (c) is bonded with the fibrous base material (d) of the air permeable sheet, is suitably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vehicle, a home,
It relates to an air purifier for office use.

[0002]

2. Description of the Related Art As an air purifier for vehicles, homes, offices, etc., a DC voltage is applied between an electrode plate and an ionizing wire to ionize dust (particles) floating in the air. 2. Description of the Related Art An ion wind type air cleaning method of absorbing, adsorbing, and removing dust on paper collected on a surface of a counter electrode plate (also referred to as a dust collecting electrode plate) is well known. This method can remove dust (particles) having a low diffusion rate particularly efficiently. This type of air purifier is used at a high voltage and oxygen in the air reacts to generate ozone, which must be removed and decomposed.
In order to remove and decompose ozone, for example, a corrugated cardboard filter on which corrugated paper or the like is superimposed and activated carbon is attached to the air outlet (Japanese Patent Publication No. 54-1979)
No. 27589), a method in which a honeycomb filter carrying a catalyst containing manganese and copper and having an ozone decomposing property is provided downstream of a dust collection unit (Japanese Patent Application Laid-Open No. Sho 62-57662).
And the like have been proposed.

[0003]

However, in the above-described air purifier, it is necessary to provide a superposed corrugated cardboard filter or a honeycomb filter having a large occupied volume for gas removal separately from the dust collecting unit. There is a problem. An object of the present invention is to provide a compact air purifier having a dust collecting function and a deodorizing function, which is an air purifier.

[0004]

The present invention is an air purifier having an ionization unit and a dust collection unit,
This is an air purifier in which a gas removal sheet is arranged on the surface of the counter electrode plate in the dust collection unit.

[0005] In the present invention, the gas removal sheet disposed on the surface of the counter electrode plate in the dust collection unit includes (a) metal and / or metal oxide particles, (b) adsorbent particles, and (c) thermoplastic resin. Particles, and (d) a fibrous base material for a breathable sheet;
The metal and / or metal oxide particles (a) and the adsorbent particles (b) are bonded to the surface of the thermoplastic resin particles (c) at the contact portions of the particles, and the thermoplastic resin particles (c) A gas removing sheet bonded to the fibrous base material (d) of the breathable sheet is preferably used.

That is, the feature of the present invention resides in that a gas removing sheet having excellent gas removing ability, air permeability, thinness and flexibility is provided on a surface of a counter electrode plate of a dust collecting unit of an air purifier. Accordingly, the air purifier of the present invention is compact and has a deodorizing function as well as a dust collecting function. This is made possible because a gas removal sheet suitable for an air purifier can be obtained.
Here, the “gas” in the gas removal means an odorous gas and a harmful gas such as hydrogen sulfide, ammonia, formaldehyde, acetaldehyde, carbon monoxide, and ozone.

In the air purifier of the present invention, an "ionization unit" having a plurality of ionization lines and a "dust collection / gas removal unit" having a counter electrode plate and a gas removal sheet disposed on the surface of the counter electrode plate are provided. And a "power supply unit" for applying a high voltage to the ionization unit, which are housed in a casing. In addition, the gas removal sheet in the "dust collection / gas removal unit" may be used alone or may be used by overlapping with a dust collection filter such as a breathable dust collection paper. When overlapping with the dust collection filter, it is preferable to place a gas removal sheet between the counter electrode plate and the filter.

An air inlet is provided at a lower or lower surface of the casing, and an air outlet is provided at an upper or upper surface of the casing. Due to the ionic wind caused by the high voltage applied to the "ionization unit", air enters through the inlet at the lower or lower surface of the casing and exits through the outlet at the upper or upper surface of the casing.

[0009] Contaminated air containing dust (particles) and / or gas is directed along the flow of air into the ionization unit, where the particles are charged into charged particles. The charged particles are attracted to the counter electrode plate of the dust collection unit and collected on a gas removal sheet (or a dust filter). The gas in the contaminated air is also moved by the flow of the ionic wind. Since the gas has a high diffusion rate, the gas easily comes into contact with the gas removing sheet, is adsorbed and collected by the gas removing sheet, and is removed. In this way, the contaminated air containing dust (particles) and / or gas is removed from the dust (particles) and gas to become clean air, and is discharged from the outlet.

[0010] The shape of the counter electrode plate in the dust collecting / gas removing unit may be flat or cylindrical.
Along with the shape, the shape of the gas removing sheet is flexibly deformed.

In the present invention, the gas removal sheet preferably used is (a) metal and / or metal oxide particles,
(B) adsorbent particles, (c) thermoplastic resin particles, and (d) a fibrous base material for a breathable sheet, and
Alternatively, the metal oxide particles (a) and the adsorbent particles (b) are bonded to the surface of the thermoplastic resin particles (c) at a contact portion between the particles, and the thermoplastic resin particles (c) are formed into a fibrous form of a breathable sheet. It is a gas removal sheet bonded to the substrate (d).

Hereinafter, this gas removal sheet will be described with reference to the drawings. FIG. 4 shows the metal and / or the gas removal sheet.
Or metal oxide particles (a1, a2), adsorbent particles (b), thermoplastic resin particles (c), and fibrous base material (d)
FIG. 2 is a schematic view showing an outline of the bonding of FIG. In FIG. 4, a1 is metal oxide particles 1 (for example, manganese dioxide), a2 is metal oxide particles 2 (copper oxide), b is adsorbent particles (for example, activated carbon), c is thermoplastic resin particles, d shows the fiber of a fibrous base material, respectively. The two types of metal and / or metal oxide particles (a1 and a2) and the one type of adsorbent particles (b) maintain their shapes (shown in the figure as spherical shapes) while keeping the thermoplastic resin. The particles (c) are bonded to the surfaces of the particles at the contact portions of the particles, and the thermoplastic resin particles (c) are bonded to each other at the respective contact portions and are bonded to the fibers of the fibrous base material (d). It forms a sheet-like porous structure having a spread.

The gas removal sheet has a porosity of 50% or more, preferably 80% or more, and a specific surface area of 20 m ² /
g or more, a material having air permeability and capable of efficiently removing bad odors and harmful substances such as hydrogen sulfide, ammonia, formaldehyde, acetaldehyde, carbon monoxide and ozone is used. The thickness may be arranged on the counter electrode plate surface of the dust collection unit, or may be arranged on the counter electrode plate surface of the dust collection unit together with a dust collection filter such as dust paper. Is 1 mm or less, preferably 0.5 mm or less. This gas removal sheet may be covered with a cover sheet having air permeability in order to prevent the surface from being stained or damaged.

The metal and / or metal oxide particles (a) in the gas removal sheet include manganese, copper, zinc,
There are particles of iron, vanadium, nickel, magnesium, aluminum, titanium, palladium, platinum, cerium, silicon and their oxides. Particles of these metal composite oxides may be used. As manganese oxide, M
There are nO ₂ , MnO, Mn ₃ O ₄ , Mn ₂ O ₃ and Mn ₂ O ₇ , among which MnO ₂ is preferably used. Examples of the copper oxide include CuO, Cu ₂ O, and Cu ₄ O, and among them, CuO is preferably used. One kind of these metal and / or metal oxide particles may be used, but two or more kinds may be used in order to have a function of purifying various kinds of harmful substances. As a preferable example in the case of mixing two or more kinds, there is one containing manganese dioxide particles and cupric oxide particles.

The adsorbent particles (b) include activated carbon, zeolite, silica gel, sepiolite, activated alumina and activated clay. The adsorbent particles carrying aluminum sulfate, iodine, ferrous sulfate, calcium phosphate, sodium carbonate, magnesium silicate, boric acid, phosphoric acid, ascorbic acid, tartaric acid, oxalic acid, tannic acid, gallic acid, etc. are also used. be able to. One type of adsorbent particles may be used, or two or more types may be used. Activated carbon includes vegetable carbonaceous materials (coconut shell, almond shell, etc.), charcoal,
In addition to bituminous coal, carbonaceous synthetic resin (phenolic resin, etc.)
And any of them can be used.

As the thermoplastic resin particles (c), ultrahigh molecular weight polyethylene, polyethylene, polycarbonate,
Polyamide ABS resin, polyimide, polyvinyl chloride,
The particles are selected from polysulfone, polystyrene phthalate, polypropylene, cellulose acetate and the like. These thermoplastic resin particles are obtained by forming metal and / or metal oxide particles (a) and adsorbent particles (b) on the surface of the thermoplastic resin particles (c) without being covered with the thermoplastic resin layer. It has a role as a binder to bind at the contact part. Among the thermoplastic resin particles, ultrahigh molecular weight polyethylene is preferably used, and its average molecular weight (measured by a viscosity method) is about 1,000,000 to 9,000,000.

As the fibrous base material (d) of the breathable sheet, a fibrous base material having a porosity of 60% to 99% is used.
For example, glass woven fabric / non-woven fabric, plastic woven fabric / non-woven fabric of polyethylene, polypropylene, polyamide, polyester and the like, paper and the like.

The sheet-like environment-purifying material comprises (a) metal and / or metal oxide particles, (b) adsorbent particles, (c) thermoplastic resin particles, (e) a water-absorbing resin, and (f) water. To form a uniformly dispersed suspension, and a predetermined amount of this suspension is retained on (d) a fibrous base material of an air-permeable sheet, and a thermal decomposition temperature equal to or higher than the melting point of the thermoplastic resin. While heating at the following temperature to remove water, the metal and / or metal oxide particles (a) and the adsorbent particles (b) are interposed between the thermoplastic resin particles (c) and the fibrous base material (d). And can be manufactured.

The metal and / or metal oxide particles (a) used have an average particle size of 0.1 to 10 μm, and the adsorbent particles (b) have a sieve opening of 48 mesh ( Particles passing through 300 μm)
The size of the thermoplastic resin particles (c) having a size occupying 50% or more of the adsorbent particles (b) on a weight basis and the average particle size of 20 to 150 μm are usually used.

The reason for adding the water-absorbent resin (e) is that the aqueous suspension of the mixed particles of the metal and / or metal oxide particles (a), the adsorbent particles (b) and the thermoplastic resin particles (c) is made uniform. It is for dispersing in. When the water-absorbent resin is added, the water-absorbent resin absorbs water and the viscosity increases, so that the suspension of the mixed particles is uniformly dispersed, and furthermore, the uniformly dispersed state is stably maintained for a long time. It is.

After a certain amount of the suspension is held on the fibrous base material, it is heated at a temperature not lower than the melting point of the thermoplastic resin and not higher than its thermal decomposition temperature for a predetermined time. By this heat treatment, moisture is evaporated and removed, and the surface layer of the thermoplastic resin particles is softened to have a bonding force. The thermoplastic resin particles having a surface layer softened and having a binding force capture and bond the particles (a) and (b) on the surface thereof while maintaining the spherical particle shape, and form the thermoplastic resin particles ( c) bonding to the fibrous base material while bonding each other at a contact portion.

Hereinafter, a production example of the gas removal sheet will be described. <Production Example of Gas Removal Sheet> 20 g of manganese dioxide (average particle size: 2.0 μm), cupric oxide (average particle size: 1.
9 g) and activated carbon (particle size: 48 mesh (30
0 μm) 55 g) were previously mixed in a ball mill. 1L of water and water-absorbent resin "Sumikagel" in a 2L container
After adding 2 g (trade name of saponified vinyl acetate-acrylate copolymer manufactured by Sumitomo Chemical Co., Ltd.) and stirring well, the total amount of the mixed particles and ultrahigh molecular weight polyethylene particles [molecular weight by viscosity method: 2, 000K, particle size: 20-1
50 μm (average particle size: 35 μm)] and further mixed well to prepare a particle suspension. This particle suspension was applied and impregnated on a glass nonwoven fabric having a thickness of 0.3 mm (40 g / m ² ) by a dip dipping method, and then heated and dried at 175 ° C. to obtain a sheet. The specific surface area of this sheet is 3
3 m ² / g, porosity was 91%.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the appearance of an air purifier according to an example of the present invention. FIG. 2 is an aa cross-sectional view of FIG. 1, and is a cross-sectional view when a dust collection filter and a gas removal sheet are stacked and used for dust collection and gas removal. In the figure, 1 is a front panel, 2
Is a discharge port, 3 is a suction port, 11 is an ionization line, 12 is a counter electrode plate, 13 is a gas removal sheet, 14 is a dust collection filter,
Reference numeral 15 denotes a filter presser.

As shown in FIG. 2, the ionization unit
It consists of one ionization line 11. The dust collection unit includes a counter electrode plate 12 and a dust collection filter 1 that covers the counter electrode plate 12.
And a gas removal sheet 13 disposed between the counter electrode plate 12 and the dust collection filter 14.
The gas removal sheet 13 is fixed by a filter presser 15. Here, as the gas removal sheet 13, the sheet obtained in the above-described production example can be used.

The contaminated air containing dust (particles) and / or gas is directed along the flow of air into the ionization unit, where the particles are charged into charged particles. The charged particles are attracted to the counter electrode plate 12 of the dust collection unit and collected by the dust filter 14. The gas also moves along the flow path of the ion wind. Because gas has a high diffusion rate,
It passes through the dust filter 14 and comes into contact with the gas removing sheet 13 to be removed. In the vicinity of the surface of the gas removing sheet 13, the concentration of the gas is close to zero, so concentration polarization occurs, and the gas further diffuses and moves, and is removed by the gas removing sheet 13.
In this way, dust (particles) and gas in the contaminated air are removed together, ozone gas generated in the ionization unit is also removed, and gas evaporating from the surface of the dust filter 14 is also effectively removed. Clean air can be taken out from the outlet.

When the gas removing sheet is placed at the position as shown in FIG. 2, the air flow path is not obstructed and no pressure loss occurs. Further, the gas has a high gas diffusion rate (for example, the gas diffusion rate of ammonia is 0.23 cm ² / s,
(25 ° C., 1 atm), a sufficient removal effect can be obtained only by arranging the gas removal sheet having a high porosity near the air flow path. The gas removing sheets can be used even if they are overlapped to such an extent that they do not affect the formation of the electric field, whereby the gas removing effect can be enhanced.

Further, the gas removing sheet can be used alone without overlapping with a dust collecting filter such as dust collecting paper. FIG. 3 shows an embodiment in such a case, and FIG.
A cross-sectional view corresponding to the cross section is shown.

[0028]

According to the present invention, a compact air purifier having a dust collecting function and a function of removing odorous gas and harmful gas can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of an appearance of an air purifier according to an example of the present invention.

FIG. 2 is a cross-sectional view taken along a line aa of FIG. 1 and is a cross-sectional view when a dust collecting filter and a gas removing sheet are overlapped and used for dust collecting and gas removing.

FIG. 3 is a cross-sectional view taken along a line aa in FIG. 1 when a gas removal sheet is used alone for dust collection and gas removal.

FIG. 4 shows the metal and / or metal oxide particles (a1, a2), adsorbent particles (b), thermoplastic resin particles (c), and fibrous base material (d) in the gas removal sheet used in the present invention.
FIG. 2 is a schematic view showing an outline of the bonding of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Front panel 2 ... Discharge port 3 ... Suction port 4 ... Switch 11 ... Ionization wire 12 ... Counter electrode plate 13 ... Gas removal sheet 14 ... Dust collection filter 15 ... Filter holder a1 ... Metal oxide particles 1 a2 ... Metal oxide Particle 2 b: adsorbent particles c: thermoplastic resin particles d: fibrous base material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takeyuki Souki 1500 Ogawa Oji, Shimodate City, Ibaraki Pref.

Claims (2)

[Claims] 1. An air purifier comprising an ionization unit and a dust collection unit, wherein a gas removal sheet is disposed on a surface of a counter electrode plate in the dust collection unit. 2. A gas removing sheet comprising: (a) metal and / or metal oxide particles, (b) adsorbent particles, (c) thermoplastic resin particles, and (d) a fibrous base material of a breathable sheet. The metal and / or metal oxide particles (a) and the adsorbent particles (b) are bonded to the surface of the thermoplastic resin particles (c) at a contact portion between the particles, and the thermoplastic resin particles (c) The air purifier of claim 1 which is a sheet bonded to the fibrous substrate (d) of the breathable sheet.