WO2019167585A1 - Air purification device - Google Patents

Abstract

Provided is an air purification device which stably maintains the effectiveness in removing chemical substances such as formaldehyde over a long period. The air purification device is equipped with an air filter and a deodorizing filter. The air filter is formed by pleating a sheet filter material which comprises a substrate layer and a fiber layer. The substrate layer supports the filter shape. The fiber layer traps particles.　The air filter further includes, in the substrate layer, an adsorbent containing an amine compound. In addition, the deodorizing filter is disposed on the front face of the air filter in terms of the air flow path. The air purification device is configured such that air flowing into the device passes through the air filter after passing through the deodorizing filter.

Description

Air purifier

The present invention relates to an air cleaning device including an air filter for air purification.

Formaldehyde, one of the aldehydes that are representative of odorous substances, is released from wallpaper and furniture in the house. And even if it is a low concentration, it causes health problems, so it is desired to remove it as an indoor pollutant.

Conventionally, in the filter medium 101 shown in FIG. 8, the adsorbent 102 is contained in activated carbon, silica gel, or the like, which is the support layer 103, and is held between the base material 104 and the cover layer 105. It has been disclosed that it is held in a filter and molded into a pleat shape (see, for example, Patent Document 1).

However, the conventional filter medium and the air purifier using the filter medium have a problem that the adsorption performance of the pleated filter is high, but the adsorption capacity is low. Specifically, since the adsorption performance is high, more formaldehyde can be adsorbed when a high concentration of formaldehyde flows into the air cleaning device. However, when the adsorbent is consumed, the adsorption performance is reduced. That is, as an air cleaning device, high formaldehyde adsorption performance cannot be maintained.

Therefore, an object of the present invention is to provide an air cleaning device that can stably maintain the effect of removing formaldehyde for a long period of time.

International Publication No. 2016/195090

Thus, there is a problem that the high adsorption performance of formaldehyde cannot be maintained due to consumption of the adsorbent.

The present invention is an air cleaning device equipped with an air filter and a deodorizing filter in which a sheet-like filter medium comprising a base material layer supporting a filter shape and a fiber layer for collecting particles in the air is pleated. The air filter includes an adsorbent containing an amine compound in a base material layer.

Also, the surface wind speed of the airflow passing through the deodorizing filter is larger than the surface wind speed of the airflow passing through the air filter. Furthermore, the adsorption rate and adsorption capacity of the deodorizing filter are larger than the adsorption rate and adsorption capacity of the base material layer.

In addition, the deodorizing filter is disposed upstream of the air filter in the airflow direction. That is, the air that has flowed into the air cleaning device passes through the deodorizing filter and then passes through the air filter.

Thus, even if air containing high-concentration formaldehyde flows into the air purifier, the formaldehyde is adsorbed by the deodorizing filter having a high adsorption capacity, and then the air passes through the air filter having a high adsorption performance. Thereby, the load of formaldehyde on the adsorbent can be reduced, and the effect of the adsorbent in the air filter can be maintained for a long time. That is, it is possible to provide an air cleaning device that can stably maintain the effect of removing formaldehyde for a long period of time.

FIG. 1 is a perspective view showing an installed state of the air cleaning device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the air cleaning device according to the first embodiment of the present invention. FIG. 3 is a perspective view of the air filter according to the first embodiment of the present invention. FIG. 4 is a configuration diagram of a filter medium used for the air filter according to the first embodiment of the present invention. FIG. 5 is a schematic sectional view of the filter medium according to the first embodiment of the present invention. FIG. 6 is an enlarged schematic sectional view of the filter medium according to the first embodiment of the present invention. FIG. 7 is a schematic view showing the arrangement of the deodorizing filter and the air filter according to the second embodiment of the present invention. FIG. 8 is a cross-sectional view showing a filter medium mounted on a conventional air cleaning device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
Usually, formaldehyde is generated from wallpaper 1 or furniture 2 in the building. Since formaldehyde has a higher specific gravity than air, it is present indoors in a high concentration state near the floor 3.

The air cleaning device 4 shown in the first embodiment is installed on the indoor floor 3 and performs an air cleaning operation as shown in FIG.

As shown in FIG. 2, the body case 5 of the air cleaning device 4 has a substantially vertically long box shape. A substantially rectangular air inlet 9 is provided on the front surface of the main body case 5. A panel 32 is disposed at the center of the air inlet 9, and the air inlet 9 is open at the edge of the panel 32. A substantially rectangular exhaust port 10 is provided on the top surface of the main body case 5. In the main body case 5, a blower 6, an air filter 7 and a deodorizing filter 8 are provided.

In the main body case 5, the air blower 6 is provided in the air path between the air inlet 9 and the air outlet 10. The air blower 6 includes a scroll-shaped casing 11 and an electric motor 13. The blade 12 is a centrifugal blower fan provided in the casing 11. The electric motor 13 rotates the blades 12.

An inlet 30 on the inlet side is provided downstream of the inlet 9. The opening 30 on the inlet side forms an entrance into the main body case 5 and has a substantially square shape. A deodorizing filter 8 is disposed over the entire surface of the opening 30 on the inlet side. The air filter 7 is disposed on the downstream side of the deodorizing filter 8. The air blower 6 is arranged further downstream of the air filter 7 and upstream of the exhaust port 10.

The air filter 7 is formed of a filter medium 14 and a shape holding part 15 (see FIG. 3).

In order to improve the dust collection performance and deodorization performance by lowering the surface wind speed during ventilation, the air filter 7 should hold the filter media 14 so that the area of the filter media 14 is widened. Therefore, as shown in FIGS. 3 and 4, the air filter 7 has a pleated shape. Further, the shape holding unit 15 includes a quadrangular side-shaped frame portion 16 and an adhesive member 17 provided between the frame portion 16 and the filter medium 14. That is, the frame portion 16 is positioned at the periphery of the filter medium 14, and the pleated filter medium 14 is fixed to the frame portion 16 by the adhesive member 17.

Although there is no particular limitation, the explanation of the pleating method will be added below. The pleated shape may be formed by folding the sheet-like filter medium 14 alternately with a mountain fold and a valley fold using a folding machine (not shown). Finally, the filter medium 14 formed into a pleat shape is fixed to the frame portion 16 by the adhesive member 17.

For example, a hot melt resin or various adhesives can be used for the adhesive member 17. If a method such as joining only the apexes of the pleats with the adhesive member 17 is used, the shape can be fixed while ensuring the surface area of the filter medium 14.

In pleating, the setting of the pitch 18 greatly affects the area of the filter medium 14 to be used. When the pitch 18 is narrowed and the peaks 31 are increased, the area of the filter medium 14 can be increased. Increasing the area of the filter medium 14 can lower the passage surface wind speed and improve the deodorizing performance. At the same time, since the amount of the adsorbent 21 contained in the base material layer 19 constituting the filter medium 14 shown in FIGS. 5 and 6 is increased, the life that can be deodorized can be extended. The detailed configuration of the filter medium 14 will be described later.

The area of the filter medium 14 is obtained by multiplying the product of the thickness dimension of the air filter 7 and the width dimension of the sheet-like filter medium 14 by the value obtained by doubling the number of peaks 31. As an example, when the pitch of the air filter 7 is 3.5 mm (about 10 to 15 times) with respect to the air filter 7 having a width of 273 mm, a height of 454 mm, and a thickness of 43.5 mm, the filter medium 14 The area is 3.1 m ² . The surface wind speed is a value obtained by dividing the processing air volume by the filter medium area. Therefore, when the processing air volume is 8.8 m ³ / min, the surface air speed for the filter medium 14 is 4.7 cm / sec. .

As shown in FIGS. 5 and 6, the filter medium 14 before the pleating process includes a base material layer 19 and a fiber layer 20. The base material layer 19 supports the air filter 7. The fiber layer 20 is disposed on the upstream side of the airflow with respect to the base material layer 19 to collect particulate matter.

The base material layer 19 and the fiber layer 20 are bonded using an adhesive. Although it does not specifically limit about the kind and method of an adhesive agent, The adhesion | attachment method by resin adhesives, such as hot melt and powder, and a hot-melt resin fiber can be mentioned. For example, when a resin adhesive such as hot melt or powder is used, a sheet-like filter is obtained by applying a heat-melted adhesive to the base material layer 19 and bonding and cooling the fiber layer 20 before solidifying. The filter medium 14 is produced.

Preferably, adhesion with a molten adhesive is good, the coating concentration on the surface can be made thinner and uniform than in powder form, and peeling of the fiber layer 20 and the base material layer 19 can be prevented. Furthermore, according to the melted adhesive, the adhesive that soaks into the base material layer 19 at the time of application of the adhesive can be thinned, so that the adhesive contains the components of the adsorbent 21 and suppresses the deodorizing performance from being deteriorated. it can.

Moreover, the pressure loss generated after pleating can be reduced by setting the thickness of the sheet filter medium 14 to 0.74 mm or less. As an example, in the air filter 7 having a width of 273 mm, a height of 454 mm, and a thickness of 43.5 mm, when the filter medium 14 is pleated at a pitch of 3.5 mm, the thickness of the filter medium 14 is changed, and a predetermined air volume is obtained. The pressure loss in was compared.

When the thickness of the filter medium 14 was 0.42 mm, the pressure loss was 70 Pa.

When the thickness of the filter medium 14 was 0.74 mm, the pressure loss was 72 Pa.

In contrast, when the thickness of the filter medium 14 was 0.94 mm, the pressure loss was 159 Pa. Furthermore, when the thickness of the filter medium 14 was 1.27 mm, the pressure loss increased to 160 Pa.

Naturally, reducing the thickness of the filter medium 14 is good for reducing pressure loss, but it leads to a decrease in the collection efficiency of the fiber layer 20 and the adsorption performance of the base material layer 19. Therefore, the thickness of the filter medium 14 is preferably in a range thinner than the thickness dimension in which the pressure loss increases rapidly. That is, it is preferable that the thickness of the filter medium 14 be in the vicinity of 0.74 mm.

For the fiber layer 20, a general resin material or a natural fiber material can be used. For example, polyacrylonitrile (PAN), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyethylene oxide (PEO), polyphenyl ether (PPE), polyphenylene oxide (PPO), polytetrafluoroethylene (PTFE), Polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethersulfone (PES), polymethacrylic acid, polymethyl methacrylate, polyvinylidene fluoride (FVDF), polyvinyl chloride (PVC), polytetrafluoroethylene, polyvinyl alcohol (PVA), polycarbonate (PC), polyamide, polyimide, polyamideimide, aramid, polyimide benzazole, polyglycolic acid (PGA), polylactic acid (PLA), Polyurethane (PU), cellulose compound, a polypeptide, nylon, etc., or may be those such as mixtures thereof.

For the purpose of reducing the pressure loss, the average fiber diameter of the fibers constituting the fiber layer 20 is preferably as thin as possible. Specifically, it is preferably composed of fibers of 100 nm to 5000 nm. If the fiber diameter is thicker than 5000 nm, the volume ratio of the resin fibers increases even if the pores of the fiber layer 20 are formed, and the air resistance increases (increases the pressure loss), which is not preferable. Moreover, it is not preferable that the fiber diameter is smaller than 100 nm because fiber breakage or fluffing is likely to occur.

Moreover, the dust collection performance can be improved by subjecting the fiber layer 20 to a post-charging treatment. As the post-charging treatment, there is an electret for applying corona discharge to the fiber layer 20 or a technique of impregnating with a solvent and then drying (not shown).

The basis weight of the fiber layer 20 is preferably 10 to 100 g / m ² . When the basis weight is less than 10 g / m ² , the self-supporting property of the fiber layer 20 is lowered, so that it is difficult to maintain the nonwoven fabric in a film shape only by the fiber layer 20. On the other hand, if the basis weight exceeds 100 g / m ² , the pressure loss of the fiber layer 20 increases, and the structural pressure loss of the air filter 7 when pleated becomes large, which is not preferable.

The base material layer 19 is formed of fibers including at least one of glass fibers, pulp fibers, resin fibers, carbon fibers, and inorganic fibers. Examples of the method for producing the base material layer 19 include a spunbond method, a dry or wet papermaking method, a melt blown method, a spunbond method, an airlaid method, and a thermal bond method.

The basis weight of the base material layer 19 is preferably 50 to 100 g / m ² . When the basis weight is less than 50 g / m ² , the bending resistance of the base material layer 19 decreases, so that it becomes difficult to reduce the productivity of the pleating process and to maintain the filter shape. Moreover, when it exceeds 100 g / m < ² >, in addition to the pressure loss of the base material layer 19 becoming large, the structural pressure loss of the air filter 7 at the time of pleating becomes large, which is not preferable.

The average fiber diameter of the fibers constituting the base material layer 19 is preferably 20 to 50 μm. If the average fiber diameter is less than 20 μm, the strength of the fibers is low, and the strength as a reinforcing material is insufficient. Further, when the fiber diameter is reduced, the adsorbent 21 is attached to the gaps between the fibers rather than on the fibers. As a result, the pressure loss increases, the amount of adsorbent 21 attached decreases, and the adsorbent 21 easily desorbs. On the other hand, when the average fiber diameter exceeds 50 μm, the thickness of the base material layer 19 is increased, and the structural pressure loss of the air filter 7 when pleated is increased, which is not preferable.

The base material layer 19 carries an adsorbent 21 containing an amine-based drug. The adsorbent 21 carried on the base material layer 19 contains an amine compound as a part of the components. It is known that an amine compound and formaldehyde cause the following irreversible chemical reaction.

For example,
R-ΝH ₂ + HCHO
→ RN = CH ₂ + H ₂ O (shiff base)
2H ₂ NCONH ₂ (urea) + HCHO
→ NN ₂ CONHCH ₂ NHCONH ₂ (dimethylol urea)
NH ₂ —NH ₂ (hydrazine) + 2HCΗO
→ CΗ ₂ = N−N = CΗ ₂
It reacts like this.

These reactions occur similarly in gas components having an aldehyde group. Therefore, in addition to formaldehyde, the same reaction occurs in aldehyde compounds such as acetaldehyde and propionaldehyde. The filter medium 14 according to the present embodiment can be applied to deodorization intended for aldehydes. The above chemical reaction is called chemisorption and is distinguished from physical adsorption such as activated carbon. In the case of chemical adsorption, since the adsorbed aldehydes are not released again, there is an advantage that the aldehydes can be stably removed stably.

There are two methods for including the adsorbent 21 containing an amine compound in the base material layer 19 before the base material layer 19 is formed and after the base material layer 19 is formed.

As a method before the fiber formation of the base material layer 19, there is a method in which the adsorbent 21 is contained in the spinning solution or the coating solution at the time of fiber spinning or coating the base fiber with a resin or the like. Further, as a method after the formation of the base material layer 19, a method in which the adsorbent 21 is dissolved and dispersed in a solution, a small amount of a surfactant and a binder are added, and then the base material layer 19 is immersed in this liquid. Examples thereof include a method in which the liquid contained in the agent 21 is sprayed and a method in which the liquid is applied with a brush or a roller.

Among the above methods, a method using a method of impregnating the adsorbent 21 after the base material layer 19 is formed is preferable.

Thereby, the adsorbent 21 can be contained in a large amount over a wide range in the surface portion 22 of the base material layer. If the adsorbent 21 can be present over a wide range of the surface portion 22 of the base material layer, the contact probability with formaldehyde increases, and the adsorption performance can be improved.

It is important that the particle size of the adsorbent 21 is 10 μm or less.

This is because, when the particle diameter is 10 μm or less, the surface area is increased and the contact probability with formaldehyde can be increased and the reactivity can be improved. On the other hand, when the particle diameter exceeds 10 μm, it is difficult to adhere to the fibers of the base material layer 19, which causes powder falling off. When powder falling occurs, the deodorizing performance is degraded. Furthermore, if the particle diameter exceeds 10 μm, the adsorbent 21 fills the gaps between the fibers forming the base material layer 19, and further increases the rigidity when pleated, so that the pressure loss of the air filter 7 is also caused. It is.

The amount of adsorbent 21 attached to the base material layer 19 is 10 g / m ² to 30 g / m ² .

This is because if the amount of adhering is less than 10 g / m ² , the deodorizing performance is lowered, and if it is more than 30 g / m ^{2, the} performance decreases due to powder falling and the pressure loss increases due to filling the voids of the base material layer 19. is there.

It is preferable that the deodorizing filter 8 is configured with a large adsorption capacity.

A substance having a large adsorption capacity is a substance having many porous adsorption sites, such as activated carbon or zeolite. By configuring the deodorization filter 8 with such a large adsorption capacity, the surface wind speed of the air passing through the deodorization filter 8 can be set to a value larger than the surface wind speed of the air passing through the air filter 7.

Although there is no special restriction, the shape of the deodorizing filter 8 is not a pleated type, but a corrugated shape, a lattice shape, a continuous shape, a net shape, or the like that can increase the surface wind speed is preferable. For example, when the opening width is 273 mm and the opening height is 454 mm, if the processing air volume of the deodorizing filter 8 is 8.8 m ³ / min, the surface wind speed is 1.2 m / sec, and the filter medium 14 of the air filter 7 The surface wind speed of 4.7 cm / sec can be about 25 times the value. More preferably, the honeycomb shape is good (details will be described in the second embodiment).

There are three methods for producing the deodorizing filter 8.

The first is a method of corrugating by dispersing activated carbon or zeolite in the base material to be corrugated. The second method is a method in which an adhesive is applied to a lattice-like, net-like, or honeycomb-like support 24 (see FIG. 7), and activated carbon or zeolite is adhered and processed. The third method is to enclose activated carbon or zeolite in the pores 25 of the honeycomb.

With the above configuration, when the air cleaning device 4 is operated, the indoor air sucked into the main body case 5 from the air inlet 9 by the air blower 6 sequentially passes through the deodorizing filter 8 and the air filter 7, and thereafter It is discharged into the room from the exhaust port 10. At this time, the air purifier 4 purifies the air containing formaldehyde in the room with the deodorizing filter 8 and the air filter 7 and blows the air into the room. The air filter 7 has a configuration in which a fiber layer 20 that mainly collects particulate matter and a base material layer 19 containing an adsorbent 21 component are pleated. In the air filter 7, when the surface wind speed at the time of ventilation is lowered, the adsorption performance of particulate matter and formaldehyde is improved.

Now, in general, formaldehyde tends to cause adsorption performance with the adsorbent 21 present on the surface portion 22 of the base material layer. In the surface portion 22 of the base material layer, the air flow that has passed through the base material layer 19 is likely to be disturbed, and the air spreads along the surface portion 22. That is, there is a high probability that formaldehyde contacts the adsorbent 21 present on the surface portion 22 of the base material layer. On the other hand, it is difficult to react with the adsorbent 21 that has entered the deep layer portion 23 of the base material layer. As a result, the initial high adsorption performance as the air cleaning device 4 is high, and if the adsorbent 21 present on the surface portion 22 of the base material layer is consumed, the adsorption performance is lowered. In particular, when high-concentration formaldehyde passes, the adsorbent 21 on the surface portion 22 of the substrate is consumed immediately, and the adsorption performance is lost.

As shown in FIG. 7, in the air cleaning device 4 of the present embodiment, the deodorizing filter 8 is disposed on the upstream side of the air filter 7. The air flowing into the air cleaning device 4 is configured to pass through the air filter 7 after passing through the deodorizing filter 8. In the deodorizing filter 8, since the surface wind speed of the process air from the ventilation part 6 is sufficiently high compared with the air filter 7, the adsorption | suction performance in the case of a low concentration of formaldehyde is low.

However, since activated carbon or zeolite has a high adsorption rate and a high adsorption capacity, the adsorption capacity of the deodorizing filter 8 can be made higher than the adsorption capacity of the base material layer 19. Because activated carbon and zeolite have pore walls, they have a relatively large surface area and a large adsorption capacity. Further, the adsorption speed can be increased by applying the dispersion force (concentration gradient) of the gas component toward the pore walls.

That is, when the inflowed formaldehyde has a low concentration, it is not adsorbed by the deodorizing filter 8 but is adsorbed and removed by the air filter 7 on the downstream side of the deodorizing filter 8. Since the air filter 7 has high adsorption performance, formaldehyde is removed from the air discharged from the exhaust port 10. On the other hand, when the inflowed formaldehyde has a high concentration, since the concentration gradient inside and outside the adsorption site of the deodorizing filter 8 is large, adsorption is promoted even in the deodorizing filter 8 having a high surface wind speed, and a certain amount is adsorbed. Can do. In addition, since the formaldehyde can be adsorbed by the air filter 7 on the downstream side of the deodorizing filter 8, formaldehyde is removed from the air discharged from the exhaust port 10. Thus, by arranging the deodorizing filter 8 on the upstream side, the amount of formaldehyde that passes through the base material layer 19 is limited, and the adsorbent 21 on the surface portion 22 is protected from being exposed to high-concentration formaldehyde. Therefore, it is possible to provide an air cleaning device having high adsorption performance over a long period of time.

(Second Embodiment)
In the present embodiment, a case where a honeycomb-like support 24 is used for the deodorizing filter 8 will be described.

That is, as shown in FIG. 7, the support 24 of the deodorizing filter 8 has a honeycomb shape. Holes 25 are formed by the partition walls of the honeycomb. It is preferable to attach or hold activated carbon or zeolite in the pores 25. For example, the hole 25 is a polygonal cylinder or a cylinder with an opening of 4 inches or less.

Thus, since the support 24 has a honeycomb shape, a large amount of activated carbon or zeolite can be attached or held around the entire periphery of the hole 25. Further, since a large number of holes 25 can be provided, a deodorizing filter that has a large adsorption capacity and is easy to contact with formaldehyde can be obtained.

With the above configuration, since the holes 25 are separated by the support 24, the formaldehyde flowing into the deodorizing filter 8 does not diffuse outside the holes 25 but is adsorbed inside the holes 25. The air after passing through the deodorizing filter 8 is further adsorbed by the air filter 7 and the concentration of formaldehyde is sufficiently reduced. Formaldehyde contained when the air discharged from the exhaust port 10 is sucked from the intake port 9 is removed.

As described above, the deodorizing filter 8 disposed on the upstream side of the airflow can prevent the adsorbent 21 from being exposed to high-concentration formaldehyde, so that the air purifier having high adsorption performance for a long period of time. Can be provided.

In particular, the air purifier according to the embodiment is an air purifier equipped with an air filter and a deodorizing filter in which a sheet-like filter medium is pleated.

The sheet-like filter medium is composed of a base material layer that supports the filter shape and a fiber layer that collects particles in the air. The base layer of the air filter contains an adsorbent containing an amine compound.

Also, the surface wind speed of the air passing through the deodorizing filter is made larger than the surface wind speed of the air passing through the air filter. Furthermore, the adsorption rate and adsorption capacity of the deodorizing filter are made larger than the adsorption rate and adsorption capacity of the base material layer, respectively.

The deodorizing filter is arranged on the upstream side of the air filter with respect to the airflow direction. That is, the air that has flowed into the air purifier passes through the air filter after passing through the deodorizing filter.

Thus, when the inflow of formaldehyde has a high concentration, even in a deodorizing filter with a high surface wind speed, the adsorption speed is fast and the adsorption capacity is large, so that adsorption is promoted and a certain amount can be adsorbed. Thereafter, formaldehyde is adsorbed by the air filter on the downstream side of the deodorizing filter, so that formaldehyde is removed from the air discharged from the air cleaning device. The action of the deodorizing filter protects the adsorbent from exposure to high concentrations of formaldehyde. That is, it is possible to provide an air cleaning device that suppresses consumption of the adsorbent contained in the base material layer and has high adsorption performance over a long period of time.

In the air purifier, the deodorizing filter is made of activated carbon or zeolite.

Thereby, the adsorption rate due to the dispersion force of the deodorizing filter can be made faster than the adsorption rate of the base material layer, and the adsorption capacity of the deodorizing filter can be made larger than the adsorption capacity of the base material layer. Therefore, a large amount of formaldehyde can be adsorbed when the concentration of inflowed formaldehyde is high. That is, even when high-concentration formaldehyde flows in, the air filter adsorbent can be protected, the amount of consumption can be suppressed, and an air cleaning device having high adsorption performance for a long time can be provided.

Further, the air purifier may be one in which the deodorizing filter has a honeycomb-shaped hole by a support and activated carbon or zeolite is attached or held in the hole.

Thereby, a large number of holes per unit area can be provided, and the adsorption capacity of the deodorizing filter can be increased. Further, the formaldehyde that has flowed into the hole cannot diffuse outside the hole, and the concentration is sufficiently reduced inside the hole and passes through the deodorizing filter. Thereafter, the reaction by the adsorbent can be caused by an air filter disposed downstream of the odor filter. Due to the action of the deodorizing filter, the adsorbent can prevent the adsorbent from being exposed to a high concentration of formaldehyde by the deodorizing filter. That is, the high adsorption performance of the air filter can be maintained for a long time. Therefore, an air cleaning device having high adsorption performance can be provided.

An air purifier equipped with an air filter and a deodorizing filter pleated with a sheet-like filter medium. A sheet-like filter medium consists of a base material layer and a fiber layer. The base material layer supports the filter shape. The fiber layer collects particles.

The air filter includes an adsorbent containing an amine compound in the base material layer. Moreover, the surface wind speed of the air which passes a deodorizing filter is larger than the surface wind speed of the air which passes an air filter. Furthermore, the deodorizing filter is arranged on the upstream side of the air filter. The action of the deodorizing filter protects the adsorbent from exposure to high concentrations of formaldehyde. That is, it is possible to provide an air cleaning device that suppresses consumption of the adsorbent contained in the base material layer and has high adsorption performance over a long period of time. The present invention can also be applied to a ventilator that requires a similar function.

DESCRIPTION OF SYMBOLS 1 Wallpaper 2 Furniture 3 Floor 4 Air purifier 5 Main body case 6 Air blower part 7 Air filter 8 Deodorizing filter 9 Intake port 10 Exhaust port 11 Casing 12 Blade 13 Electric motor 14 Filter medium 15 Shape holding part 16 Frame part 17 Adhesive member 18 Pitch 19 Base material layer 20 Fiber layer 21 Adsorbent 22 Surface portion 23 Deep layer portion 24 Support body 25 Hole 30 Opening on the inlet side 31 Pile 32 Panel 101 Filter medium 102 Adsorbent 103 Support layer 104 Base material 105 Cover layer

Claims (3)

An air purifier equipped with an air filter and a deodorizing filter pleating a sheet-like filter medium comprising a base material layer supporting a filter shape and a fiber layer for collecting particles, wherein the air filter is the base material layer Contains an adsorbent containing an amine compound,
The surface wind speed of the airflow passing through the deodorizing filter is larger than the surface wind speed of the airflow passing through the air filter, and the adsorption speed and adsorption capacity of the deodorizing filter are respectively based on the adsorption speed and adsorption capacity of the base material layer. And make it bigger
The deodorizing filter is disposed in front of the air path of the air filter, and the air purifying apparatus passes through the air filter after the air flowing into the air purifying apparatus passes through the deodorizing filter. The air purifier according to claim 1, wherein the deodorizing filter is made of activated carbon or zeolite. The air purifier according to claim 1 or 2, wherein the deodorizing filter has a honeycomb-shaped hole by a support, and activated carbon or zeolite is attached or held in the hole.

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