JP4113345B2 - Sterilization filter unit and air purification system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sterilization filter unit and an air cleaning system.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there are air filters that filter air, which are used in air conditioners such as air purifiers and air conditioners. Some of these air filters not only remove foreign matters such as dust and dust floating in the air to produce clean air, but also can filter out microorganisms such as bacteria and mold. . Especially in hospitals and industrial clean rooms, HEPA filters (more than 90% by colorimetric method and 99.97% or more particles by counting method can take 99.97% or more) and high-performance dust collection called ULPA filters. It has been practiced to discharge air that is almost aseptic using a dust collection filter made of a filter medium.
[0003]
On the other hand, since a general dust collection filter cannot kill microorganisms such as captured bacteria, there is a possibility that these microorganisms grow on the dust collection filter. In particular, when pathogenic bacteria that are air-infected are captured, if the bacteria grown on the dust collection filter move to the downstream side of the dust collection filter, there is a concern that secondary contamination will be caused. In addition, the dust captured by the dust collecting filter may be used as a nutrient to generate mold, resulting in a strange odor.
[0004]
Therefore, the dust collection filter is replaced at an early cycle to suppress the occurrence of secondary infection and off-flavor. In addition, when replacing the dust collection filter, there is a concern that microorganisms grown on the dust collection filter may scatter around or adhere to workers.
[0005]
On the other hand, conventionally, a light source (hereinafter referred to as a UV lamp) capable of emitting ultraviolet rays is disposed in an air cleaning system, and microorganisms captured by a dust collection filter are killed using the ultraviolet rays. In addition to direct sterilization using ultraviolet rays, an ultraviolet catalytic filter using titanium oxide or the like is disposed upstream of the dust collecting filter, and the ultraviolet catalytic filter is irradiated with ultraviolet rays, thereby providing a sterilizing effect. There are also things that make it appear.
[0006]
In addition, an enzyme-added dust collection filter is also conceivable in which an enzyme having a lysis effect is immobilized on the fibers constituting the dust collection filter, and the microorganism can be decomposed by the enzyme.
[0007]
[Problems to be solved by the invention]
However, the sterilization method using the UV lamp has a problem that it is restricted by the performance of the UV lamp. That is, the UV lamp generally has a low conversion efficiency when converting electric power into ultraviolet rays, and it is necessary to consume a large amount of electric power in order to exhibit sufficient performance. In addition, since the UV lamp has a short life in continuous use, high-priced parts must be replaced in a short cycle, which increases the running cost and maintenance cost. And there also existed a problem that the bactericidal effect was not expectable at the time of the fall of the irradiation amount of the ultraviolet-ray by a UV lamp, or the light extinction.
[0008]
Moreover, since the ultraviolet catalyst filter has a low capture rate of microorganisms such as bacteria, the microorganisms may pass through as they are. As a result, live microorganisms are directly captured by the dust collection filter, and there is a concern that secondary infection and generation of off-flavors due to mold will occur. In addition, since the photocatalytic filter is separately installed on the upstream side of the dust collection filter, the system structure becomes complicated and the installation space becomes unavoidable.
[0009]
Furthermore, the photocatalytic filter using ultraviolet rays has restrictions on the structure and its catalytic properties, and the catalytic action is reduced when the surface of the catalyst is contaminated with trapped dust, etc., so if this photocatalytic filter is used for a long period of time, it must be sterilized sufficiently. It was difficult to carry out, and there was a possibility that living microorganisms existed in the dust adhering to the surface of the dust collection filter installed in the subsequent stage. Therefore, the replacement work of the dust collecting filter is still dangerous.
[0010]
On the other hand, when the enzyme-added dust collection filter is used, microorganisms that are reliably captured by the dust collection filter can be sterilized, but microorganisms that have passed through the dust collection filter have a sterilization effect. I couldn't hope. For this reason, the enzyme-added dust collection filter must have an extremely high dust trapping function, and the manufacturing cost of the enzyme-added dust collection filter is increased accordingly, and this special dust filter is replaced more frequently. There was a problem that running costs and maintenance costs were raised accordingly.
[0011]
The present invention has been made in consideration of such circumstances, more reliably maintaining sterilization performance, preventing the occurrence of secondary infections and off-flavors, ensuring safety during maintenance, An object of the present invention is to provide a sterilization filter unit and an air cleaning system capable of realizing energy saving.
[0012]
[Means for Solving the Problems]
In the present invention, means for solving the above-described problems are configured as follows.
The sterilization filter unit according to the first aspect of the present invention is attached so as to follow the dust collection filter medium and the upstream side surface of the dust collection filter medium. , Including acrylonitrile fiber having an anionic functional group and containing antibacterial active metal compound It is characterized by comprising a photocatalytically active sterilizing filter medium. (Claim 1)
[0013]
The above-mentioned photocatalytically active sterilizing filter medium is a “filter having photocatalytic activity” which is invented by the inventor of the present invention and explicitly disclosed in a patent application filed on March 17, 2000 (Japanese Patent Application No. 2000-77196). The structure is an acrylonitrile in which the fibers are three-dimensionally assembled, and the fibers are provided with a filtration gap through which a liquid such as air or water can pass between the fibers, the fibers containing an antibacterial active metal compound. It includes acrylonitrile fiber having photocatalytic activity, which is obtained by heat-treating the fiber based on a pH of 1 to 6.
[0014]
The antibacterial active metal compound of the antibacterial acrylonitrile fiber is preferably a silver compound. (Claim 2) . And The acrylonitrile fiber of this antibacterial active metal compound has an anionic functional group The In addition, the antibacterial acrylonitrile fiber is obtained by heat-treating acrylonitrile fiber with wet heat or dry heat at 100 to 160 ° C. Hope Good.
[0015]
The antibacterial acrylonitrile fiber is preferably contained in an amount of 10% by weight or more, and the fiber preferably contains an antibacterial acrylonitrile fiber and a binder fiber. The binder fibers are unstretched polyester fibers, and the binder fiber content is more preferably 20 to 90% by weight.
[0016]
The photocatalytically active sterilizing filter medium sterilizes microorganisms by continuously generating hydroxy radicals by photocatalytic reaction in the state of irradiation with light including visible light. Also, even in the dark room, when microorganisms such as bacteria and mold permeate, it acts to incorporate, for example, silver as an antibacterial active metal into the microorganism, and has a strong antibacterial and bactericidal power against the microorganism. Yes. FIG. 4 shows the results of testing the bactericidal activity of Escherichia coli using a photocatalytically active filter medium containing 80% silver-supporting acrylic fiber.
[0017]
As indicated by the circles in FIG. 4, the photocatalytically active sterilizing filter medium used in the present invention does not use light of a special wavelength such as ultraviolet rays. Bacteria (99.99% or more) can be killed. In addition, as indicated by □, even in a dark room, the number of surviving bacteria decreased by two orders of magnitude after 17 minutes (99% died), and after 1 hour, all bacteria (99.99% or more) were killed. Can be made. That is, the photocatalytically active sterilizing filter medium used in the present invention can exert more excellent sterilizing power when exposed to visible light such as room light, but sterilizes microorganisms even in a dark room. be able to.
[0018]
FIG. 5 shows the results of experiments on the sterilization effect on Escherichia coli permeating through a photocatalytically active sterilizing filter medium containing 30% silver-supporting acrylic fiber. As shown in FIG. 5, even after passing through the photocatalytically active sterilizing filter medium, most of the bacteria can be sterilized after 30 minutes, and can be reliably sterilized after 120 minutes.
[0019]
That is, the microorganisms that have passed through the photocatalytically active sterilization filter medium are taken up into the microorganisms by hydroxyl radicals and silver, which is an antibacterial active metal. In addition to being propagated within, the microorganisms that permeate the photocatalytically active sterilizing filter medium are surely killed within a predetermined time even if they are not captured by the dust collection filter medium. That is, by using the sterilizing filter unit of the present invention, it is possible to reliably suppress and reduce the growth of microorganisms such as bacteria.
[0020]
In addition, since the microorganisms that have passed through the photocatalytically active filter medium will eventually die, the need to reliably capture all of them with the filter medium will be reduced, and the accuracy of the filter medium will be adjusted accordingly. Thus, the cost can be suppressed. In addition, when maintaining the dust collection filter medium, the operator is safe without touching the live microorganisms that have propagated in the dust collection filter medium.
[0021]
Furthermore, the sterilizing filter unit of the present invention can be installed in place of a filter used in general air conditioning equipment, and the air conditioning system having a sterilizing effect that can prevent the growth of microorganisms in a general air conditioning equipment very easily. can do. In particular, the photocatalytically active sterilizing filter medium using the sterilizing filter unit of the present invention can surely kill bacteria touching it within a predetermined time, so it is only attached to an air conditioner that forcibly circulates a large amount of air. Thus, an air cleaning system having an extremely high sterilization effect can be formed.
[0022]
An air cleaning system according to a second aspect of the present invention includes the sterilizing filter unit and a light source that irradiates light to the photocatalytically active sterilizing filter medium of the sterilizing filter unit. (Claims 3 )
[0023]
By irradiating light containing visible light to the photocatalytically active sterilizing filter medium, it is possible not only to exhibit more excellent sterilizing power, but also to use a general-purpose light source that emits visible light with high efficiency, long life, and low cost. be able to. That is, manufacturing costs, running costs, and maintenance costs can be suppressed, and energy saving can be achieved.
[0024]
In the case where the air cleaning system has dimming means for adjusting the intensity of light irradiated from the light source to the sterilization filter unit (claims) 4 ) Since unnecessary strong light is not irradiated, the amount of energy consumption can be suppressed and the energy can be saved.
[0025]
The intensity of the light irradiating the sterilizing filter unit is, for example, that when the light quantity is insufficient in accordance with the intensity of the light incident from the surroundings in order to obtain a light quantity for exerting an appropriate sterilizing power, light is emitted by the amount that is insufficient In order to adjust the sterilizing power in accordance with the amount of floating microorganisms, it is conceivable to adjust the intensity of light applied to the sterilizing filter unit according to the time zone.
[0026]
An air cleaning system according to a third aspect of the present invention includes the sterilizing filter unit and a light incident window for introducing light into the sterilizing filter unit. (Claims 5 )
[0027]
The light Enter The light incident through the emission window can enhance the sterilizing power of the sterilizing filter unit. Since it is not necessary to provide a separate light source for the sterilizing filter unit, it can contribute to energy saving. In particular, when an air purification system is installed in a hospital or the like, the ambient illuminance is a measure of the amount of patient activity and the amount of microorganisms floating, and a stronger sterilizing power can be obtained when many microorganisms are floating. .
[0028]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing a configuration of a sterilizing filter unit 1 of the present invention.
In FIG. 1, 2 is, for example, a HEPA class dust collecting filter medium, 3 is a photocatalytically active sterilizing filter medium laminated along the upstream side surface of the dust collecting filter medium 4, and 4 is an edge of these filter media 2 and 3 without gaps. It is a filter unit frame to be fixed. The sterilizing filter unit 1 is mounted so that air flows in the direction indicated by the arrow A.
[0029]
FIG. 2 is a view for explaining generation of a composite filter by the dust collection filter medium 2 and the photocatalytically active sterilization filter medium 3. As shown in FIG. 2 (A), the dust collecting filter medium 2 of this example is a filter medium having a thickness t of 1 mm, for example, and its accuracy can be appropriately selected according to the purpose of use of the sterilizing filter unit 1. In the example, it is a high-performance filter medium that can capture 99.97% of particles of 0.3 μm or more by the coefficient method (HEPA class).
[0030]
Since the dust collection filter medium 2 of this example is a HEPA class filter, it can be used for a laboratory that handles pathogenic bacteria that are air-infected or an air purifier that is placed in an isolation room. In addition, the accuracy of the dust collecting filter medium 2 is selected as a place where the sterilizing filter unit 1 is attached, for example, for food hygiene management, semiconductor manufacturing process management, hospital hygiene management, etc. Can realize cost performance.
[0031]
On the other hand, the fibers constituting the photocatalytically active sterilizing filter medium 3 are acrylonitrile fibers containing 1 to 200 m · mol / kg of metal ions such as silver compounds as antibacterial active metal compounds, and the acrylonitrile fibers are anionic An antibacterial acrylonitrile system having a photocatalytic activity obtained by heat-treating a functional group containing 0.1 to 20% by weight with hot water or dry heat at 100 to 160 ° C. in the range of pH 1 to 6, preferably pH 2 to 4. The fiber (silver-supported acrylic fiber) is, for example, 10 to 100% by weight, generally 10 to 90% by weight, preferably 20 to 70% by weight, more preferably 30 to 60% by weight, and most preferably 40 to 60% by weight. % Of fibers used.
[0032]
Further, the photocatalytically active sterilizing filter medium 3 is made of the fiber having a length of, for example, 1 to 25 mm, preferably 3 to 15 mm, and a thickness of, for example, 0.1 to 20 denier, preferably 0.3 to 6 denier. , 60% by weight or more of the nonwoven fabric formed. And the thickness t 'is 0.08-0.3 mm.
[0033]
The photocatalytically active sterilizing filter medium 3 having the above structure is laminated on at least the upstream surface 2a of the dust collection filter medium 2 to form a composite filter medium. The composite filter medium sterilizes microorganisms such as bacteria and fungi captured by the dust collection filter medium 2. Also sterilization filter unit 1 Safety at the time of replacement can be further enhanced.
[0034]
The photocatalytically active sterilizing filter medium 3 may also be laminated on the downstream surface 2 b of the dust collection filter medium 2. In this case, the microorganisms captured by the dust collection filter medium 2 are surely sterilized, and even if the microorganisms can live through the dust collection filter medium 2, they are surely killed by the photocatalytically active sterilization filter medium 3. be able to. In particular, the photocatalytically active sterilizing filter medium 3 laminated on the downstream surface 2b of the dust collecting filter medium 2 is permeated with air from which dust has been removed by the dust collecting filter medium 2, so that the photocatalytically active sterilizing filter medium 3 is contaminated by dust. The sterilizing power lasts for a long time.
[0035]
As shown in FIG. 2B, the laminated composite filter medium forms a plurality of bent portions 1a by being subjected to pleating. This pleating process increases the air passage area per unit area and reduces the air resistance caused by pressure loss when passing through the sterilizing filter unit 1.
[0036]
And the edge part of the fiber which gave the pleating process comprises the sterilization filter unit 1 by being fixed to the filter unit frame 4 shown in FIG. The sterilizing filter unit 1 can be used by replacing it with a commercially available air filter of an air conditioner or an air purifier.
[0037]
In addition, since the filter unit frame 4 is attached to the sterilization filter unit 1 of this example, handling of the sterilization filter unit 1 becomes easy, and it becomes possible to perform more reliable dust collection and sterilization. The filter unit frame 4 is not necessarily attached to the sterilizing filter unit 1 of the present invention.
[0038]
In particular, in the case of home air conditioners and air purifiers, the genuine air filter may not have a frame, the sizes thereof are various, and strict sterilization performance is not required. Handling without the filter unit frame 4 is easier. Further, in the case of a domestic air conditioner or air cleaner, the accuracy of the dust collecting filter medium 2 can be roughened so that maintenance can be reduced and the manufacturing cost can be reduced.
[0039]
In any case, when the microorganism permeates the photocatalytically active sterilizing filter medium 3, it is possible to continuously generate hydroxy radicals under light irradiation, thereby killing the microorganism. In addition, since the antibacterial active metal is taken into the microorganism even in a dark room, a strong antibacterial and sterilizing power can be exerted against the microorganism. In particular, the photocatalytically active sterilizing filter medium 3 used in the present invention can enhance the sterilizing power by utilizing visible light energy instead of light having a special wavelength such as ultraviolet rays. By simply replacing the unit 1 with an existing air conditioner or air purifier filter, an effective sterilizing action can be obtained, and the existing air conditioner or air purifier becomes an air purifying system having a sterilizing function.
[0040]
In particular, since the antibacterial active metal is taken into the microorganism once passed through the photocatalytically active sterilizing filter medium 3, the microorganism is killed within a predetermined time (see FIG. 5). Therefore, even if some of the microorganisms that have passed through the photocatalytically active filter medium 3 circulate again without being captured by the dust collection filter medium 2, the microorganisms will eventually die.
[0041]
That is, in the present invention, the dust trapping performance of the dust collection filter medium 2 does not greatly affect the sterilization performance of the sterilization filter unit 1, and the sterilization filter unit 1 having high sterilization power can be manufactured at low cost. Therefore, the sterilization filter unit 1 is particularly useful in an air cleaning system that obtains a sterilizing action while circulating a large amount of air, as in the case of a home air conditioner or an air purifier.
[0042]
FIG. 3 is a diagram showing a configuration of an air purifier 5 as an example of the air purifying system of the present invention. In FIG. 3, reference numeral 6 denotes a main body of the air cleaner 5, and the main body 6 has a suction grill 6 a for sucking air and a blow grill 6 b for blowing purified air. Is divided into a first chamber 6A, a second chamber 6B and a third chamber 6C which are isolated from each other.
[0043]
7 and 8 are sterilization filter units provided upstream and downstream of the first chamber 6A, 9 is a fluorescent lamp disposed between the sterilization filter units 7 and 8 for emitting visible light, and 10 is a sterilization filter An optical sensor for measuring the intensity of light irradiated on the unit 8, 11 is a control circuit (light control means) of the air cleaner 5, and 12 is arranged at the downstream end of the second chamber 6 </ b> B to create an air flow. I am a fan.
[0044]
The sterilizing filter unit 7 comprises a photocatalytically active sterilizing filter medium 13 and a dust collecting filter medium 14, and an arrow A ₁ The pre-filter for removing large particles of dust from the air sucked into the first chamber 6A from the suction grill 6a. Since the prefilter 7 is attached along the suction grille 6a, the photocatalytically active sterilizing filter medium 13 can receive energy from the surrounding visible light and enhance the sterilizing action. That is, the suction grill 6a is light. Enter It becomes a shooting window.
[0045]
On the other hand, the sterilizing filter unit 8 includes a photocatalytically active sterilizing filter medium 15, a dust collecting material 16 laminated thereon, and a filter unit frame 17 for holding these composite filter mediums 15 and 16 without any gaps. 17 in room 1 6A And second room 6B It is attached to the communication port 6c without any gap. The dust collection filter medium 16 constituting the sterilization filter unit 8 is a HEPA class filter medium capable of capturing 99.97% of particles of 0.3 μm or more by a counting method.
[0046]
Therefore, arrow A ₂ As shown in FIG. 5, the air flowing into the second chamber 6B through the communication port 6c becomes a dust removal sterilization gas from which dust particles corresponding to the filtration accuracy of the dust collection material 16 have been removed.
[0047]
The fluorescent lamp 9 is a general-purpose lamp that emits visible light, and an inexpensive lamp with a long life and high efficiency can be used. In this example, five fluorescent lamps 9 are used as one fluorescent lamp unit, and this is a light source for irradiating the sterilizing filter units 8 and 7 with light. The power supplied to the light source 9 is adjusted by the control circuit 11 in accordance with the light intensity measured by the optical sensor 10.
[0048]
That is, the control circuit 11 measures the intensity of the light applied to the sterilizing filter unit 8 by the optical sensor 10 and the control circuit 11 supplies the light source so that the illuminance is high enough to maintain the sterilization performance by the photocatalytically active sterilizing filter medium 15. The dimming is performed by adjusting the power of the inverter output supplied to the inverter 9, for example. That is, the control circuit 11 is a light control means. By providing the light control means 11, the air cleaner 5 can irradiate the sterilization filter units 8 and 7 with visible light necessary for sterilization without wasting unnecessary power.
[0049]
If the surroundings are sufficiently bright, the ambient light that has passed through the sterilizing filter unit 7 is also applied to the sterilizing filter unit 8 through the light incident window 6a. Therefore, it is not necessary to supply power at all. That is, the life of the light source 9 can be extended accordingly. The light source 9 does not need to be a fluorescent lamp, and a halogen lamp, a tungsten lamp, a light emitting diode, or the like may be used as a desired light source capable of emitting visible light.
[0050]
In addition, although the light control by the light control means 11 shows an example in which the intensity of the light applied to the sterilizing filter unit 8 is set to a predetermined value or more, the present invention does not limit this point. . For example, it is possible to adjust the light so as to increase the sterilizing power in accordance with the amount of bacteria and molds flying around. In other words, the light intensity is adjusted so that a strong sterilizing ability can be obtained in the time of day when people are often active, and the sterilization is strong under the condition that the activity of microorganisms becomes active from various factors such as temperature and humidity. Various configurations such as making it possible to obtain power can be considered.
[0051]
The control by the control circuit 11 can be performed by an operation program, for example. For example, when the air purifier 5 is operated intermittently, the bacteria captured by the sterilizing filter unit 8 by irradiating the sterilizing filter unit 8 with light using the light source 9 during and immediately after the operation of the air purifier. It is possible to program operations such as speeding up the sterilization speed or turning off the light source 9 and waiting for the next operation when sterilization by light irradiation is completed.
[0052]
The fan 12 is attached to the communication portion between the second chamber 6B and the third chamber 6C without a gap, and forms the entire air flow of the air cleaner 5. That is, by the operation of the fan 12, the arrow A ₁ As shown in FIG. 4, air is sucked from the suction grill 6a, and the filtered and sterilized air is indicated by an arrow A. ₂ , A _Three , A _Four As shown in FIG. _Five Can be blown out from the blowing grill 6b. The operation of the fan 12 can be controlled by an operation program of the control circuit 11.
[0053]
By using the air purifier (air purifying system) 5 of the present invention, dusts floating in the air sucked from the suction grille 6a and microorganisms such as bacteria and mold are only captured and removed by the sterilizing filter units 7 and 8. In addition, since the captured microorganisms can be surely killed, it is possible to reliably prevent them from breeding in the air cleaner 5.
[0054]
In particular, since the sterilizing filter units 7 and 8 are formed using the photocatalytically active sterilizing filter media 13 and 15 each having a photocatalytic action by visible light, it is not necessary to emit special light such as ultraviolet rays, and the efficiency is increased accordingly. Sterilization can be performed. Especially in places where people are active, the ambient illuminance is high, so that microorganisms floating due to human activities can be sterilized efficiently.
[0055]
Further, by providing two stages of sterilizing filter units 7 and 8 as in this example, the replacement cycle of the sterilizing filter units 7 and 8 can be lengthened, and microorganisms can be sterilized more reliably. Furthermore, since the propagation of microorganisms in the sterilizing filter units 7 and 8 can be reliably prevented, it is possible to ensure safety when the sterilizing filter units 7 and 8 are replaced.
[0056]
The sterilization filter units 7 and 8 can have a photocatalytic activity function and a dust trapping function in one sterilization filter unit by laminating the dust collecting filter media 14 and 16 and the photocatalytic activity sterilization filter media 13 and 15. As a result, space can be saved.
[0057]
In addition, even if the microorganisms can pass through the two-stage sterilization filter units 7 and 8, even if a few microorganisms are mixed in the air blown out from the air cleaning device 5 of this example, Has already taken in the antibacterial active metal when it passes through the photocatalytically active sterilizing filter media 13, 15, and dies after a predetermined time. Therefore, propagation of microorganisms can be effectively suppressed.
[0058]
That is, by using the air cleaning system 5 of the present invention, highly efficient and safe dust removal and sterilization can be performed, and highly reliable hygiene management can be performed. Moreover, since the light irradiation by the light source 9 can be minimized by using visible light, not only can it contribute to energy saving, but also the life of the light source 9 can be extended, and labor and cost for maintenance management can be reduced. It can be suppressed as much as possible.
[0059]
In the above example, the sterilizing filter units 7 and 8 are the dust collecting filter media. 14 , 16 photocatalytically active sterilizing filter media along the upstream side 13 , 15 is shown, but this photocatalytically active sterilizing filter medium is used as a dust collection filter medium. 14 , 16 may be attached along the downstream side surface. That is, the dust collection filter medium 14 , 16 is attached to the downstream side photocatalytically active sterilizing filter medium is attached to the upstream side photocatalytically active sterilizing filter medium. 13 , 15, dust is less likely to adhere and the sterilizing power can be maintained for a longer period of time.
[0060]
In particular, in the case of this example, when a photocatalytically active sterilizing filter medium is attached to the downstream side surface (back side) of the sterilizing filter unit 7, more powerful sterilization can be performed by the light from the light source 9 being applied.
[0061]
【The invention's effect】
As described above, according to the sterilization filter unit and the air purification system of the present invention, sterilization performance is ensured by performing sterilization using a photocatalytically active sterilization filter medium having strong sterilization power using visible light energy. Thus, it is possible to prevent the occurrence of secondary infection and off-flavor, to ensure safety during maintenance, and to reduce energy consumption.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a sterilizing filter unit of the present invention.
FIG. 2 is a view showing a process for manufacturing the sterilizing filter unit.
FIG. 3 is a diagram showing an example of an air cleaning system of the present invention.
FIG. 4 is a view showing an E. coli sterilizing action by a photocatalytically active sterilizing filter medium.
FIG. 5 is a diagram showing the bactericidal action of Escherichia coli left after permeation through the photocatalytically active bactericidal filter medium.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,7,8 ... Sterilization filter unit, 2, 14, 16 ... Dust collection filter medium, 3, 13, 15 ... Photocatalytic active sterilization filter medium, 5 ... Air purification system, 9 ... Light source (fluorescent lamp), 11 ... Light control means (Control means), 6a ... light incident window (suction grill).

Claims (5)

A dust collecting filter medium and a photocatalytically active sterilizing filter medium including an acrylonitrile-based fiber having an anionic functional group and containing an antibacterial active metal compound attached along the upstream side surface of the dust collecting filter medium Sterilization filter unit. The sterilizing filter unit according to claim 1, wherein the antibacterial active metal compound is a silver compound. Air cleaning system comprising: the sterilizing filter unit according to claim 1 or 2, and a light source for irradiating light to the photocatalytic activity bactericidal filter material of this sterilizing filter unit. The air cleaning system according to claim 3 , further comprising a light control unit for adjusting the intensity of light irradiated from the light source to the sterilization filter unit. An air cleaning system comprising: the sterilizing filter unit according to claim 1 or 2; and a light incident window for introducing light into the sterilizing filter unit.

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