WO2019167584A1

WO2019167584A1 - Air purification device

Info

Publication number: WO2019167584A1
Application number: PCT/JP2019/004327
Authority: WO
Inventors: 大輔小森; 港加藤; 知弘足立; 由浩辻
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2018-02-27
Filing date: 2019-02-07
Publication date: 2019-09-06

Abstract

An air purification device (4) is equipped with a case (5) in which an intake opening (9) and an exhaust opening (10) are provided, and an air filter (7) which is disposed within the case (5) and is formed by pleating a sheet filter material. The air filter (7) is provided with a substrate layer that supports the filter shape, and a fiber layer that is formed from fibers having a narrower diameter than the fibers forming the substrate layer and that traps particles in the air. The substrate layer has higher air permeability than the fiber layer and includes an adsorbent containing an amine compound. The fiber layer is disposed upstream of the substrate layer relative to the direction of air flow.

Description

Air purifier

The present invention relates to an air purifier equipped with an air filter for the purpose of air purification.

One of the aldehydes that are representative of odorous substances is formaldehyde.

Formaldehyde is emitted 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 formaldehyde as an indoor pollutant.

Conventionally, as shown in FIG. 10, the filter medium 101 mounted on the air cleaning device contains the adsorbent 102 in the carrier layer 103 and holds the carrier layer 103 sandwiched between the base material 104 and the cover layer 105. . The support layer 103 is activated carbon, silica gel, or the like. Furthermore, it has been disclosed that the filter medium 101 is formed into a pleated shape (see, for example, Patent Document 1).

International Publication No. 2016/195090

However, when the filter medium was mounted on an air purifier, a wind speed distribution was generated in the filter medium due to the structure of the air path.

Therefore, the adsorbent (chemical reaction chemicals and catalysts, zeolite and activated carbon with adsorption performance, etc.) carried on the air filter carrier layer increases the treatment air volume at high wind speeds, The consumption increased and the adsorption performance deteriorated early.

An object of the present invention is to provide an air cleaning device that suppresses performance deterioration due to local consumption of adsorbent.

An air purifying apparatus according to an aspect of the present invention includes a case provided with an intake port and an exhaust port, and an air filter disposed in the case and pleated with a sheet-like filter medium. The air filter has a base material layer that supports the filter shape and a fiber layer that collects particles in the air. Moreover, the fiber which comprises a fiber layer has a fiber diameter thinner than the fiber which comprises a base material layer. The base material layer has a higher air permeability than the fiber layer and includes an adsorbent containing an amine compound. And the fiber layer is arrange | positioned upstream from the base material layer with respect to the flow direction of airflow.

Thereby, the air flowing into the air cleaning device passes through the base material layer after passing through the fiber layer. The air flowing from the fiber layer with low air permeability into the base layer with high air permeability causes turbulent flow in the fiber layer with low air permeability. Due to the turbulent action, the air flow direction spreads in a different direction at the base material layer interface and inside the base material layer, so that the surface air speed distribution of the air filter is leveled, that is, the wind speed when passing through the air filter surface The effect of suppressing the performance deterioration due to local consumption of the adsorbent is achieved.

FIG. 1 is a perspective view showing an installation 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 of the air cleaning device 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 cross-sectional view of a filter medium used in the air filter according to the first embodiment of the present invention. FIG. 6 is an enlarged schematic cross-sectional view of the filter medium used in the air filter according to the first embodiment of the present invention. FIG. 7 is a cross-sectional view of an air cleaning device according to a second embodiment of the present invention. FIG. 8 is a schematic view showing the arrangement of the continuous rectifying filter and the air filter in the air cleaning device according to the second embodiment of the present invention. FIG. 9 is a schematic view showing the arrangement of the grid rectification filter and the air filter in the air cleaning device according to the second embodiment of the present invention. FIG. 10 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)
In a normal building, formaldehyde is generated from wallpaper 1 or furniture 2 as shown in FIG. 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 floor 3 in the room and performs an air cleaning operation.

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. The air inlet 9 surrounds the central panel 32 at the front edge. A substantially rectangular exhaust port 10 is provided on the top surface of the main body case 5.

A blower 6 and an air filter 7 are provided in the main body case 5.

The air blower 6 is provided in the air passage between the air inlet 9 and the air outlet 10 in the main body case 5. In addition, the air blowing unit 6 includes a scroll-shaped casing 11, blades 12, 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. The air blowing unit 6 is below the main body case 5. This is due to the configuration of the casing 11 in consideration of the influence of the main body air volume and the blowing sound.

An opening 30 is provided on the downstream side of the intake port 9. The opening 30 forms an entrance into the main body case 5 and has a substantially square shape. 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 as shown in FIG. The shape holding unit 15 holds the filter medium 14.

In order to reduce the surface wind speed during ventilation and improve the dust collection performance and deodorization performance, it is better that the shape holding section 15 holds the filter medium 14 so that the area of the filter medium 14 is widened. Therefore, as shown in FIGS. 3 and 4, the filter medium 14 is formed into a pleated shape in the form of a sheet. The shape holding unit 15 includes a frame portion 16 having a quadrangular side shape, and an adhesive member 17 provided between the frame portion 16 and the filter medium 14. That is, the frame portion 16 is located on the periphery of the filter medium 14. The pleated filter medium 14 is fixed to the frame 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 (see FIG. 4) greatly affects the area of the filter medium 14 to be used. When the pitch 18 is narrowed and the mountains 31 (see FIG. 4) are increased, the area of the filter medium 14 can be increased. By increasing the area of the filter medium 14, the speed of the air passing through the filter medium 14 can be reduced, and the deodorization performance can be improved. At the same time, since the amount of the adsorbent 21 (see FIG. 6) contained in the base material layer 19 (see FIG. 5) constituting the filter medium 14 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 the product of the thickness dimension and height dimension of the air filter 7 and the width dimension of the sheet-like filter medium 14 multiplied by a value obtained by doubling the number of peaks 31. As an example, when the pitch 18 interval 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 area of the filter medium 14 is 3. 1 m ² . Further, the surface wind speed is a value obtained by dividing the processing air volume by the area of the filter medium 14, and therefore when the processing air volume is 8.8 m ³ / min, the surface air speed of 4.7 cm / sec is applied to the filter medium 14. It becomes.

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 filter shape of the air filter 7. The fiber layer 20 is disposed upstream of the airflow with respect to the base material layer 19 and collects particulate matter in the air.

The base material layer 19 and the fiber layer 20 are bonded using an adhesive. The type and method of the adhesive are not particularly limited, and examples thereof include an adhesive method using a resin adhesive such as hot melt or powder or a hot-melt resin fiber. For example, when a resin adhesive such as hot melt or powder is used, a heat-melted adhesive is applied to the base material layer 19, and the fiber layer 20 is bonded and cooled before it is hardened. The filter medium 14 is produced.

There are two types of adhesion by heat melting: adhesion to which a molten adhesive is bonded after application, and adhesion by applying a powdered adhesive and then thermocompression bonding.

It is preferable to bond the molten adhesive after application. This is because the coating concentration on the surface can be made thin and uniform, and the adhesion between the fiber layer 20 and the base material layer 19 can be improved. That is, peeling can be prevented by improving the adhesion. Furthermore, since the adhesive that soaks into the base material layer 19 at the time of application can be thinned, the adhesive does not include the components of the adsorbent 21. That is, it can suppress that deodorizing performance falls by using the fuse | melted adhesive agent.

Moreover, the pressure loss generated after pleating can be reduced by setting the thickness of the sheet-like filter medium 14 to 0.74 mm or less. As an example, in the case of 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 to a predetermined value. The pressure loss in the air volume 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 thinner. Specifically, the average fiber diameter of the fibers constituting the fiber layer 20 is preferably 100 nm or more and 5000 nm or less. When the fiber diameter is larger than 5000 nm, even if the fiber layer 20 forms pores, the ratio of the volume occupied by the resin fibers increases, 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 . If the basis weight is less than 10 g / m ² , the self-supporting property of the fiber layer 20 is lowered, and it becomes difficult for the fiber layer 20 itself to maintain the nonwoven fabric in a film form. 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 is lowered, and 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 fiber, and the pressure loss is increased, or the amount of adsorbent 21 attached is reduced, or the adsorbent 21 is reduced. The problem that it becomes easy to detach arises. 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 fiber diameter of the base material layer 19 is 10 times or more thicker than the fiber diameter of the fiber layer 20. That is, the fiber layer 20 is composed of fibers that are sufficiently thinner than the fibers constituting the base material layer 19. On the other hand, the fabric weight of the fiber layer 20 and the base material layer 19 is comparable. Therefore, the volume density of the base material layer 19 is extremely smaller than the volume density of the fiber layer 20, and accordingly, the air permeability is sufficiently small. For example, the fiber diameter of the base material layer 19 is 50 μm, the basis weight is 100 g / m ² , the fiber diameter of the fiber layer 20 is 5 μm, and the basis weight is 100 g / m ² , both of which have the same fiber length and thickness. Suppose that In this case, the volume density of the base material layer 19 is 1/100 times the volume density of the fiber layer 20. This difference in volume density causes a difference in air permeability between the base material layer 19 and the fiber layer 20. The air permeability of the base material layer 19 is about 2 to 4 times larger than the air permeability of the fiber layer 20. That is, the base material layer 19 has a sufficiently higher air permeability than the fiber layer 20.

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-ΝH2 + HCHO
→ RN = CH2 + H2O (shiff base)
2H2NCONH2 (urea) + HCHO
→ NN2CONHCH2NHCONH2 (dimethylol urea)
NH2-NH2 (hydrazine) + 2HCΗO
→ CΗ2 = N−N = CΗ2
It reacts like this.

These reactions occur in the same way for gas components having an aldehyde group. In addition to formaldehyde, the same reaction occurs with 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 re-released, there is an advantage that the aldehydes can be removed stably.

Examples of the method for including the adsorbent 21 containing the amine compound in the base material layer 19 include a method for including the base material layer 19 before the formation of the base material layer 19 and a method for including the base material layer 19 after the formation. . As a method of including before the base material layer 19 is formed, 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 of the base fiber with a resin or the like. In addition, as a method of inclusion 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 forming the base material layer 19 is preferable.

Thereby, the surface portion 22 of the base material layer 19 can be in a state where a large amount of the adsorbent 21 is contained over a wide range. If the adsorbent 21 can be present in a wide range of the surface portion 22 of the base material layer 19, 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 by setting the particle diameter to 10 μm or less, the surface area of the adsorbent 21 is increased, and the contact probability with formaldehyde can be increased and the reactivity can be improved. On the other hand, if the particle diameter exceeds 10 μm, the adsorbent 21 becomes difficult to adhere to the fibers of the base material layer 19 and causes powder falling. 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, thus causing a pressure loss of the air filter 7. Also mentioned.

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 adhesion is less than 10 g / m ² , the deodorizing performance is lowered, and if the amount of adhesion is larger than 30 g / m ² , the performance loss due to powder falling or the pressure loss due to filling the voids of the base material layer 19 This is to cause an increase.

Also, the fiber layer 20 is arranged and pleated so as to be upstream of the base material layer 19 in the airflow direction.

In the air cleaning device 4 having the above-described configuration, when indoor air is sucked into the main body case 5 from the air inlet 9 by the air blowing unit 6, the air that has been sucked in passes through the air filter 7 and the exhaust port. 10 is returned to the room. That is, the air cleaning device 4 uses the air filter 7 to remove formaldehyde contained in indoor air and blows air into the room.

According to the above configuration, the air filter 7 has a structure in which the fiber layer 20 that mainly collects the particulate matter and the base material layer 19 containing the component of the adsorbent 21 are laminated and further pleated. Yes. Thereby, the area of the filter medium 14 can be increased, the amount of each fiber can be increased, and in addition, the amount of adsorbent 21 attached can be increased. Adsorption performance can be improved.

Now, in FIG. 6, formaldehyde generally tends to cause an adsorption reaction with the adsorbent 21 present on the surface portion 22 of the base material layer 19. This is because there is a high probability that formaldehyde comes into contact with the adsorbent 21 present on the surface portion 22 of the base material layer 19. 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 air cleaning device 4 has high initial adsorption performance, and if the adsorbent 21 present on the surface portion 22 of the base material layer 19 is consumed, the adsorption performance becomes low. Further, when the distribution of the surface wind speed flowing into the air filter 7 is uneven, the consumption of the adsorbent 21 is locally increased. As an example in which the distribution of the surface wind speed flowing into the air filter 7 is biased, the air blowing section 6 is below the main body case 5, so the surface wind speed is high below the air filter 7 and the surface wind speed is relatively high above. There are examples of lowering.

As a result, the initial high adsorption performance is lost early in the local portion where the surface wind speed has increased. That is, the adsorption performance as the air cleaning device 4 is deteriorated early.

In the air filter 7 of the air cleaning device 4 of the present embodiment, the fiber layer 20 is disposed on the upstream side of the base material layer 19 and further pleated. The air flowing into the air filter 7 passes through the base material layer 19 after passing through the fiber layer 20. The fibers constituting the fiber layer 20 are sufficiently thinner than the fibers constituting the base layer 19 (for example, the diameter of the constituent fibers of the base layer 19 is 2 μm, whereas the diameter of the constituent fibers of the base layer 19 is 2 μm). 20 μm), a turbulent flow can be generated in the previous stage of the base material layer 19 containing the adsorbent 21. Due to the turbulent flow, the distribution of the surface wind speed is leveled at the entrance of the base material layer 19. On the other hand, since the air permeability of the base material layer 19 is sufficiently higher than that of the fiber layer 20, the energy of the turbulent flow generated in the fiber layer 20 is maintained. At the interface between the base material layer 19 and the fiber layer 20 or inside the base material layer 19, the air current spreads in different directions due to the energy of the turbulent flow.

Thereby, the distribution of the surface wind speed is leveled and the air volume passing through the base material layer 19 is balanced. Further, since the fiber layer 20 has a small fiber diameter, the inflowed formaldehyde diffuses in the fiber layer 20. Therefore, there is no bias in the amount of formaldehyde that passes through the base material layer 19. As described above, it is possible to prevent the adsorption performance of the adsorbent 21 of the base material layer 19 from being lowered or locally deteriorated, and maintain the formaldehyde adsorption performance of the air cleaning device 4 over a long period of time.

(Second Embodiment)
A configuration including the rectifying filter 8 in addition to the configuration of the first embodiment will be described.

As shown in FIG. 7, the air cleaning device 4 of the present embodiment includes a rectifying filter 8 on the front surface of the air filter 7 on the upstream side of the airflow. The rectifying filter 8 has a larger area than the front surface of the air filter 7 and is disposed over the entire surface of the opening 30. That is, the front surface of the air filter 7 is covered.

The rectifying filter 8 is adjacent to the air filter 7. From the air inlet 9 toward the air outlet 10, the air inlet 9, the rectifying filter 8, the air filter 7, the air blower 6, and the air outlet 10 are arranged in this order from the upstream side of the airflow.

Although not particularly limited, it is preferable to use activated carbon, zeolite, urethane foam, nonwoven fabric, or the like as a constituent material of the rectifying filter 8. The form of the rectifying filter 8 includes a continuous shape (FIG. 8), a lattice shape (FIG. 9), a net shape, a pleat shape, a corrugated shape, and the like. Among them, it is preferable to adopt a continuous shape or a lattice shape. Further, the rectifying filter 8 itself has a thickness for diffusing air so that the inside can be ventilated in the vertical direction. Here, the thickness of the rectifying filter 8 is a length from the upstream side to the downstream side (from the left side to the right side in FIG. 7). The vertical direction refers to a direction perpendicular to the thickness direction of the rectifying filter 8.

Although there is no particular limitation, the method of manufacturing the rectifying filter 8 is, for example, a method of cutting a urethane foam with low pressure loss into a rectangular body, or after attaching an adhesive to the continuous support 24, A method in which activated carbon or zeolite is retained and dried, or a method in which activated carbon or zeolite is retained and dried after attaching an adhesive to the lattice-like support 24, or a plurality of corrugated molds are stacked. There is a manufacturing method. These are fixed by a frame or a net. Furthermore, as shown in FIG. 8, it is also possible to arrange a plurality of these rectifying filters 8 in a stacked manner.

In the above configuration, the air flowing into the air inlet 9 of the air purifier 4 by the operation of the air blowing unit 6 once collides with the rectifying filter 8 from the opening 30 on the air inlet 9 side to generate turbulent flow. At this time, an air flow from the colliding part toward the support 24 is generated. Thereafter, rectification is performed in the rectification filter 8.

Further, by providing the rectifying filter 8 with a thickness, the air that has flowed in can be diffused in the direction perpendicular to the thickness direction inside the rectifying filter 8 to be ventilated. As a result, the air flowing in from the intake port 9 can level the surface wind speed distribution that it originally had with the rectifying filter 8, so that there is no bias in the processing air volume in the air filter 7.

Therefore, in the air filter 7 arranged on the downstream side of the rectifying filter 8, it is possible to prevent a decrease in adsorption performance and local consumption of the adsorbent 21 contained in the base material layer 19. That is, the adsorption performance of the air filter 7 can be maintained over a long period of time. And the air purification apparatus which maintained the removal performance of formaldehyde for a long period can be provided.

Further, when adopting a form in which activated carbon is attached to the lattice-like or continuous support 24 of the rectifying filter 8 or a form in which zeolite is attached, the inflowed formaldehyde is physically adsorbed once on the activated carbon or zeolite. After that, it will be released. Therefore, the flow rate of the adsorbed substance into the air filter 7 is reduced by arranging the rectifying filter 8 to which activated carbon or zeolite is attached. Moreover, the formaldehyde concentration can be made uniform.

Further, as shown in FIG. 8, by making the rectifying filter 8 into a continuous shape, the air that has flowed into the air cleaning device 4 is perpendicular to the inflow direction on the inner side surrounded by the support 24 for the continuous flow. It flows along the direction and can move from a location with a high wind speed distribution to a location with a low wind speed distribution. Thereby, the wind speed distribution of the air flowing into the air filter 7 can be leveled. That is, the surface wind speed distribution of the air flowing into the air filter 7 becomes uniform, the local degradation of the adsorbent 21 can be prevented, and the formaldehyde adsorption performance of the air cleaning device 4 can be maintained over a long period of time.

Further, as shown in FIG. 9, in the lattice-shaped rectifying filter 8 to which activated carbon or zeolite is attached, the air filter 7 is adjacent to a portion where the surface air velocity is high (for example, a portion facing the suction port of the blower 6). The part which is adjacent to the part (for example, the part away from the air blowing part 6) where the surface wind speed of the air filter 7 is low may be a large opening 26. According to this configuration, it is easy to generate turbulent flow with a small opening 25 in a portion where the surface wind speed is high, and an air flow to the large opening 26 is easily generated. The rectifying filter 8 may be attached with at least one of activated carbon and zeolite.

Therefore, the surface wind speed distribution flowing into the air filter 7 becomes uniform.

Moreover, the small openings 25 increase the amount of physical adsorption by increasing the amount of activated carbon or zeolite per unit area.

This eliminates the bias in the amount of formaldehyde to be processed, so that local degradation of the adsorbent 21 contained in the base material layer 19 can be prevented, and the formaldehyde adsorption performance of the air cleaning device 4 can be maintained over a long period of time.

As described above, the air purifier includes a case provided with an intake port and an exhaust port, and an air filter disposed in the case and pleated with a sheet-like filter medium. The air filter has a base material layer that supports the filter shape and a fiber layer that collects particles in the air. Moreover, the fiber layer is comprised with the fiber whose fiber diameter is thinner than the fiber which comprises a base material layer. The base material layer has a higher air permeability than the fiber layer and includes an adsorbent containing an amine compound. And a fiber layer is arrange | positioned with respect to the flow direction of an airflow rather than a base material layer at the upstream.

Thereby, the air flowing into the air cleaning device passes through the base material layer after passing through the fiber layer. The air flowing from the fiber layer with low air permeability into the base layer with high air permeability causes turbulent flow in the fiber layer with low air permeability. Due to the turbulent action, the airflow direction spreads in different directions at the base material layer interface and inside the base material layer, so that the surface wind speed distribution of the air filter is leveled. That is, there is an effect that the air volume passing through the air filter is made uniform, and performance deterioration due to local consumption of the adsorbent is suppressed.

Further, the air cleaning device may further include a rectifying filter disposed on the upstream side of the air filter. The rectifying filter is disposed over the entire opening on the intake port side, and has a configuration in which air flowing from the intake port can pass through the inside of the rectifying filter in a direction perpendicular to the thickness direction.

This allows the air flowing into the air purifier to spread in a direction perpendicular to the inflow direction when passing through the rectifying filter. Therefore, the surface wind speed distribution of the air filter can be relaxed, the balance of the passing air volume can be maintained, and the performance deterioration due to local consumption of the adsorbent can be suppressed.

Further, the rectifying filter may be one in which at least one of activated carbon and zeolite is attached to a lattice-like support.

Further, the rectifying filter may be one in which at least one of activated carbon and zeolite is attached to a continuous support.

Thus, by adsorbing at least one of activated carbon and zeolite to the rectifying filter, the adsorbed adsorbed material is once physically adsorbed on at least one of the activated carbon and zeolite, and then released. Thereby, the inflow speed of the adsorbed material to the air filter is leveled, and the concentration difference of the adsorbed material is made uniform. In addition, by making the rectifying filter into a lattice shape or a continuous shape, the inflowing air diffuses in the direction perpendicular to the inflow direction on the inner side surrounded by the support body, and the wind speed distribution starts from the part where the wind speed distribution is high. It can flow to a low point. Thereby, the wind speed distribution of the air flowing into the air filter can be leveled.

Further, the rectifying filter may have a lattice shape, and a portion having a high surface wind speed may have a small opening, and a portion having a low surface wind speed may have a large opening.

This makes it easy to generate turbulence in a portion where the surface wind speed is high, and it is easy to generate an air flow to a portion having a large opening, so that the rectifying effect can be increased. Therefore, the surface wind speed distribution flowing into the air filter can be made uniform, and the surface wind speed distribution can be leveled.

Also, the amount of physical adsorption can be improved by reducing the mesh size and increasing the amount of activated carbon or zeolite per unit area.

The configuration of the air purifier can effectively remove odorous substances such as formaldehyde, can be stably maintained for a long time, and can be applied to a ventilator that requires the same 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 Commutation 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 Substrate layer 20 Fiber layer 21 Adsorbent 22 Surface portion 23 Deep layer portion 24 Support 25 Small aperture 26 Large aperture 30 Open 31 Mountain 32 Panel 101 Filter medium 102 Adsorbent 103 Support layer 104 Base material 105 Cover layer

Claims

A case provided with an air inlet and an air outlet;
An air filter disposed in the case and pleated with a sheet-like filter medium,
The air filter includes a base material layer that supports a filter shape, and a fiber layer that is made of fibers having a fiber diameter smaller than that of the fibers constituting the base material layer and collects particles in the air. The base material layer has a higher air permeability than the fiber layer, and includes an adsorbent containing an amine compound,
The said fiber layer is an air cleaning apparatus arrange | positioned with respect to the flow direction of an airflow upstream from the said base material layer.
A rectifying filter disposed upstream of the air filter;
2. The rectifying filter is disposed over the entire opening on the intake port side, and has a configuration in which air flowing in from the intake port can pass through the rectifying filter in a direction perpendicular to the thickness direction. The air purifier according to 1.
The air rectifier according to claim 1, wherein the rectifying filter has at least one of activated carbon and zeolite attached to a lattice-like support.
The air rectifier according to claim 1, wherein the rectifying filter has at least one of an active material and zeolite attached to a continuous support.
3. The air purifier according to claim 2, wherein the rectifying filter has a lattice shape, a portion having a high surface wind speed has a small opening, and a portion having a low surface wind speed has a large opening.