JP2008043580A - Deodorizing filter and air cleaning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin and compact deodorizing filter with low pressure loss and high deodorizing capacity and an air cleaning device using the same. <P>SOLUTION: The deodorizing filter 1 which is a constituent of an air cleaning device is constituted of an adsorbing material 3 adsorbing toxic gas and malodor in air, fiber 4 carrying a catalyzer and the adsorbing material 3, and a filter frame 5 housing the fiber. The diameter of the fiber 4 is 5 to 30 μm; the basic weight of the fiber is 40 to 400 g/m<SP>2</SP>, and the carrying quantities of the catalyzer 2 and the adsorbing material carried by the fiber 4 are 100 to 900 g/m<SP>2</SP>respectively. Further, the fiber 4 is constituted of an inorganic material which is mainly constituted of a silicon compound, a transition metal, or carbon or a polymer organic material, and the main component of the catalyzer carried by the fiber 4 comprises at least one kind of metal oxides or rare metals. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a deodorizing filter having a low pressure loss and high deodorizing performance, and an air purifier using the deodorizing filter.

  A conventional deodorizing filter is formed by laying granular activated carbon and adsorbent in a plate shape with a reduced pressure loss, and passing it through a bag made of a polymer organic material such as polyethylene or polypropylene. The surface area of the granular activated carbon and the adsorbent that come into contact with harmful gases is increased to obtain high deodorizing performance.

  In addition, there are papers, ceramic papers and cordierite formed in a honeycomb shape so that the catalyst and adsorbent are supported to ensure a large surface area, and the pressure loss of the filter during ventilation is kept low (for example, patents) Reference 1).

Japanese Patent Laid-Open No. 2001-120648 (FIG. 1, paragraphs 0019 and 0028)

  In a conventional deodorizing filter having a structure in which granular activated carbon and an adsorbent are spread, the pressure loss becomes higher than a specified value, and the noise becomes larger than the specified value to obtain a predetermined air volume. there were.

  Moreover, in the conventional filter formed in the honeycomb shape shown in Patent Document 1, the amount of catalyst and adsorbent supported is large, but the catalyst and adsorbent are supported on a surface parallel to the inflow direction of harmful gas. For this reason, there is a problem that the contact probability between the harmful gas and the catalyst is low, and the effective catalyst and adsorbent carrying area contributing to deodorization is small.

  In the above-mentioned type of filter, the opening area must be increased in order to reduce the pressure loss. In order to obtain high deodorizing performance, the filter must be thickened or the opening area increased to increase the volume. As described above, in order to obtain a filter having high deodorizing efficiency and low pressure loss in the conventional method, there is a problem that it is necessary to enlarge the filter, and accordingly, the air purifier must be enlarged.

  The present invention has been made to solve the above-described problems, and is to obtain a thin and small deodorizing filter having a low pressure loss and high deodorizing performance, and an air purifying apparatus using the deodorizing filter. Objective.

The deodorizing filter according to the present invention contains a catalyst that decomposes harmful gases and unpleasant odors in the air, an adsorbent that adsorbs harmful gases and unpleasant odors in the air, fibers that carry the catalyst and the adsorbent, and fibers , When the volume of the frame (hereinafter referred to as filter volume) is Vcm ³ and the filter deodorization rate is η%, η ≧ 0.15 × V, and the wind speed of the air passing through the frame is 1 m The pressure loss P at / s is 35 Pa or less, and the filter volume V is 600 cm ³ or less.

According to the present invention, when the deodorization rate with respect to the filter volume V (cm ³ ) of the deodorization filter is η, η ≧ 0.15 × V, and the pressure loss P at the wind speed of 1 (m / s) is 35 Pa. Hereinafter, by installing a deodorizing filter having a filter volume V of 600 cm ³ or less in the air purifier, the air purifier main body can be made thinner and smaller without reducing the deodorizing performance of the air purifier. Further, by using the deodorizing filter according to the present invention, a high deodorizing performance can be obtained with a smaller amount of catalyst and adsorbent than a conventional deodorizing filter formed in a honeycomb shape.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing a deodorizing filter according to Embodiment 1 of the present invention. As shown in FIG. 1, a deodorizing filter 1 carries a catalyst 2 that decomposes harmful gases and unpleasant odors in the air, an adsorbent 3 that adsorbs harmful gases and unpleasant odors in the air, and a catalyst 2 and an adsorbing material 3. And a filter frame 5 that accommodates the fibers 4 carrying the catalyst 2 and the adsorbent 3. The adsorbent 3 has the ability to remove harmful gases and unpleasant odors in the air at a higher speed than the catalyst 2 by the adsorption action, and the ability to remove harmful gases and unpleasant odors that cannot be removed by the catalyst 2, and the catalyst 2 is adsorbed by a chemical reaction. 3 has the ability to remove harmful gases and unpleasant odors that cannot be removed. Therefore, by carrying both the catalyst 2 and the adsorbent 3 on the fiber, harmful gases and unpleasant odors in the air can be efficiently removed.

Next, the first embodiment will be described. FIG. 1 shows a fibrous deodorizing filter carrying a deodorizing material in which a catalyst 2, an adsorbing material 3 and a chemical additive are mixed. In the supporting step, the deodorizing material is prepared so that the viscosity of the slurry is optimally supported and uniformly supported on the filter fiber 4. For this reason, an increase in the pressure loss of the filter due to non-uniformity such as clogging can be suppressed, and further, the effective surface area of the deodorizing material is increased and high deodorizing performance is obtained. Therefore, since the amount of catalyst that can be supported on the fiber surface increases, sufficient deodorizing performance can be obtained even with a filter having a very small basis weight. In this embodiment, it is possible to carry a deodorizing material of 100 g / m ² which is a necessary minimum amount with respect to 40 g / m ² which is the lower limit value of the filter basis weight, and to realize a deodorizing rate of 80% or more. it can. In this way, a uniform support capable of supporting a higher density than the uneven support structure can be realized. FIG. 2 is a graph showing the relationship between the catalyst loading and the deodorization rate in the deodorization filter of the present invention. In order to achieve a deodorization rate of 80% or more in a honeycomb filter used as a conventional deodorization filter, a catalyst loading amount of 250 g / m ² or more is required. By using the deodorization filter of the present invention, 100 g / A deodorization rate of 80% can be achieved with a catalyst loading of m ² . FIG. 3 is a graph comparing the deodorizing filter of the present invention, the honeycomb filter, and the activated carbon filter when the amount of the deodorizing material is the same, regarding the relationship between the filter volume and the deodorizing rate. When the deodorization rate of the filter is η (%), the deodorization rate of the filter of the present invention is η ≧ 0.15 × V. In the activated carbon filter and the honeycomb filter, which are generally said to have high deodorization performance, the filter deodorization rate η (%) Is η <0.15 × V. Therefore, the deodorizing filter of the present invention satisfying the above η ≧ 0.15 × V indicates that the deodorizing performance per filter volume is extremely high. As described above, the volume of the deodorizing filter of the present invention can be reduced while maintaining the same high deodorizing performance as that of the conventional deodorizing filter, and the air purifier can be downsized accordingly. Furthermore, the conventional filter requires a volume of 1000 cm ³ or more in order to obtain the above deodorizing performance at a pressure loss of 35 Pa or less, and a pressure of 50 Pa or more in order to obtain the above deodorizing performance at a volume of 600 cm ³ or less. However, by using the deodorizing filter of the present invention, a low pressure loss deodorizing filter with a pressure loss of 35 Pa or less and a filter volume of 600 cm ³ or less can be realized. The diameter or thickness of the blower fan can be reduced. For this reason, the air purifier can be thinned. Therefore, by installing a filter that satisfies the above three conditions in the air purifier, the air purifier main body can be made thinner and smaller. By installing the deodorizing filter of the present invention in the air cleaning device, the air cleaning device main body can be made thinner and smaller.

In the deodorizing filter according to the present invention, the fiber diameter is 5 to 30 μm, the basis weight of the fiber is 40 to 400 g / m ^2, and the adsorbent and catalyst supported on the fiber are 100 to 900 g / m ² . did. Further, the fibers 4 are made of silicon oxide, transition metal such as nickel, copper, iron, cobalt, or inorganic material mainly composed of one or more of carbon, or polypropylene, polyester, polyethylene, acrylic, aramid, polyamide. Of these, it was composed of one or more kinds of polymer organic materials.
The reason for limiting to the above numerical range is as follows.
In order to obtain a filter satisfying ηV ≧ 0.15 × V when the deodorization rate with respect to the filter volume V (cm ³ ) is ηV (%), adsorption is performed with respect to the basis weight of all fibers as shown in FIG. The loading amount of the material and the catalyst needs to be 100 g / m ² or more. When the loading amount exceeds 900 g / m ² , the adhesion strength for holding the catalyst and the adsorbent on the fiber is rapidly weakened with an increase in the loading amount, As shown in FIG. 4, the amount of falling off of the catalyst and the adsorbent (powder falling amount) also increases rapidly. In addition, the catalyst is detached from the fiber with the passage of time, leading to deterioration of the deodorizing performance. In addition, when the fiber diameter is 30 μm or more, the fiber is easily broken, and the catalyst and the adsorbent supported on the fiber also fall off at the same time, leading to deterioration of the deodorizing performance. Further, when the fiber diameter is 5 μm or less, the fiber is softened, and therefore, the amount of binder used for forming the filter is increased, and the fiber diameter is also 5 μm or more as a result. Further, if the basis weight of the fiber is at least less than 40 g / m ² , it is not possible to carry a catalyst loading of 100 g / m ² or more necessary to satisfy the above conditions, and if it is not less than 400 g / m ² The catalyst cannot be uniformly supported on the fiber, and the filter is clogged.

  The fiber 4 is made of, for example, a binder composed of an organic compound mainly composed of at least one of acrylic resin, melamine resin, and urea resin, or an inorganic compound mainly composed of at least one of silica and alumina. The held metal oxide or noble metal, or the metal oxide and noble metal and the adsorbent 3 are supported. The main component of the supported catalyst 2 is one or more metal oxides of one or more of manganese, cobalt, cesium, copper, zinc and nickel, or one or more of platinum, palladium, ruthenium, gold and silver. It consists of a noble metal as the main component.

  Moreover, by supporting the catalyst 2, not only the four major malodorous components of acetaldehyde, ammonia, methyl mercaptan, trimethylamine, but also formaldehyde, toluene, xylene, volatilized from acetic acid, methyl disulfide, isovaleric acid, and building solvents, Reduces volatile organic compounds such as benzene to a harmful level or less, and the adsorbent 3 supported in the same manner is mainly one or more of silica gel, activated carbon, zeolite, porous silica having a pore diameter of 5 to 500 mm. By comprising a porous material as a component, the amount of adsorption removal and the adsorption rate can be improved.

  By using the above fiber filter as a deodorizing filter, it is possible to obtain a surface area larger than the honeycomb for the same filter volume, and since a turbulent flow is generated in the filter due to the network structure, the probability of contact with particles is also high. Increase.

FIG. 5 shows a comparison of acetaldehyde removal performance between the honeycomb-shaped deodorizing filter of Embodiment 1 of the present invention and the deodorizing filter of the present invention. As a result of measuring the attenuation of acetaldehyde concentration in a 1 m ³ box for 30 minutes when a wind tunnel with a 100 cm ² deodorizing filter is installed in a 1 m ³ box filled with 1 ppm of acetaldehyde and ventilated at a wind speed of 1 m / s. The deodorizing filter of the invention obtained the same deodorizing performance with a catalyst and adsorbent amount 2/5 times that of the honeycomb-shaped deodorizing filter.

  Further, by using the deodorizing filter as an antibacterial filter, it is possible to obtain a larger surface area than the honeycomb-shaped deodorizing filter with respect to the same filter volume. Also, as shown in FIG. Since the air flowing in from the wind direction 6 shown is turbulent in the deodorizing filter, the probability of contact between the fibers 4 and the bacteria is increased, and the fibers 4 easily capture the bacteria, and high antibacterial performance is obtained.

  FIG. 7 is a side sectional view showing Embodiment 1 of an air cleaning device to which the deodorizing filter of the present invention is applied. The air purifying device 6 in FIG. 7 includes a suction port 7, a dust collection filter 8, a deodorizing filter 9, a blower fan 10, and a blowout port 11 in order from the suction port side. This deodorizing filter 9 is the same as the deodorizing filter 1 shown in FIG.

Hereinafter, the operation of the air cleaning apparatus according to Embodiment 1 will be described with reference to FIG.
Toxic gases and unpleasant odors are sucked from the suction port 7 in the direction of the wind direction 12 indicated by the arrow, and after passing through the dust collecting filter 8, are removed on the deodorizing filter 9, passed through the blower fan 10 and blown out port 11 Clean air is exhausted in the direction of the wind direction 13.

  The deodorizing filter 9 used in the air cleaning device 6 shown in FIG. 7 has a mesh structure in which fibers are randomly formed and has a larger opening area than a deodorizing filter having a knitted structure with high density. Is even lower. For this reason, harmful gas and unpleasant odor can flow from any direction with respect to the filter surface. As a result, when the deodorizing filter 9 of the present invention is actually incorporated into the air cleaning device, the entire surface of the filter can be ventilated even if the deodorizing filter 9 is close to the blower fan 10, so that it is larger than the suction area of the blower fan 10. Even when the deodorizing filter 9 having an area is disposed, the deodorizing performance corresponding to the entire area of the filter can be obtained, and the depth of the air cleaning device 6 can be reduced.

  Further, as shown in FIG. 6, it is more preferable that all the fibers constituting the deodorizing filter 9 are molded so as to have a component parallel to the filter opening surface. By forming all the fibers 4 constituting the deodorizing filter 9 so as to have a component parallel to the filter opening surface, more odor gas particles flowing in contact with the fibers, so that they are supported on the fibers. The probability of contact with the catalyst and the adsorbent is increased, and high deodorizing performance can be obtained. Further, by forming the filter fibers 4 as described above, the number of fibers 4 having a component in the thickness direction is reduced. Therefore, the thickness of the deodorizing filter 9 can be reduced, and the air cleaning device 6 is also reduced in thickness. be able to.

As described above, according to the first embodiment, the deodorizing filter, which is a component of the air cleaning device, carries the adsorbent that adsorbs harmful gases and unpleasant odors in the air, the catalyst, and the adsorbent. It is composed of a fiber and a filter frame that accommodates the fiber, the fiber diameter is 5 to 30 μm, the fiber basis weight is 40 to 400 g / m ^2, and the supported amount of catalyst and adsorbent supported on the fiber is 100 to 900 g / m ² . Further, the fiber is made of silicon oxide, transition metal, inorganic material mainly composed of carbon, or polymer organic material, and the main component of the catalyst supported on the fiber is made of metal oxide or noble metal. Since it consists of at least one kind, it is possible to obtain a deodorizing filter having a high deodorizing performance and a low pressure loss with a smaller amount of catalyst and adsorbent than a conventional deodorizing filter. Therefore, it is possible to reduce the size of the deodorizing filter without deteriorating the deodorizing performance, and accordingly, it is possible to reduce the thickness and size of the air cleaning device main body.

Embodiment 2. FIG.
FIG. 8 is a side cross-sectional view showing the configuration of the air cleaning device in the second embodiment of the present invention, and the deodorizing filter in the first embodiment is also used in the second embodiment. The air purifying apparatus of FIG. 8 has a suction port 7, a dust collecting filter 8, a deodorizing filter 9, a blower fan 10, a blowout port 11, and a vaporizing element 13, a water storage tank 14, and a vaporizing element below the blower fan 10 in order from the suction port side. 13 and a water storage tray 14 are formed below the water storage tank 14.

Hereinafter, the configuration and operation of the air purifier according to Embodiment 2 will be described with reference to FIG.
Toxic gases and unpleasant odors are sucked in the direction of the wind 12 from the suction port 7, pass through the dust collection filter 8, and then removed and cleaned on the deodorization filter 9, the gas passing through the blower fan 10 It is divided into gas that passes through the vaporizing element 13 and then passes through the blower fan 10, and clean air is discharged in a state where dry air and humidified air are mixed before the outlet 11. The blower fan 10 is arranged at the upper part of the vaporizing element 13 and is configured by a double-suction fan that sucks in gas directly from the deodorizing filter 9 and gas flowing in from the vaporizing element 13 from one side. The water storage tray 15 is disposed under the vaporizing element 13 and the water storage tank 14, and water flowing out of the water storage tank 14 is stored in the water storage tray 15, and the lower part of the vaporization element 13 is immersed. At this time, the water storage tank 14 is installed outside the ventilation path inside the air purifier 6. The vaporizing element 13 is made of an organic or inorganic material whose main component is one or more of silica and zeolite having hygroscopicity, and the element stored from the lower part of the vaporizing element 13 in which water stored in the water storage tray 15 is immersed. It is a filter having a water absorption force to suck up to the upper surface.

  In the above structure, by making the adsorbent 3 carried on the deodorizing filter 9 hydrophobic, it is possible to suppress the deterioration of the deodorizing performance even when the deodorizing filter 9 is brought close to the vaporizing element 13.

  Moreover, since the odor gas which flows in is removed by the deodorizing filter 9 by the said structure, the purified gas will pass the vaporization element 13, and clean humid air will be discharged | emitted from the blower outlet 11. FIG.

  Further, since clean air passes through the vaporizing element 13, it is possible to suppress the growth of bacteria and mold on the vaporizing element 13, and there is no concern that the bacteria propagated on the vaporizing element 13 are released to the outside of the aircraft. Furthermore, the deterioration of water absorption of the vaporizing element 13 can be reduced.

  Moreover, the ventilation fan 10 can be made thin by arrange | positioning the vaporization element 13 on the upper part.

  As described above, according to the second embodiment, since the vaporizing element for humidification is further provided and the adsorbent carried on the deodorizing filter is made hydrophobic, the effect of the first embodiment while suppressing the deterioration of the deodorizing performance. Can be played.

Embodiment 3 FIG.
FIG. 9 is a side cross-sectional view showing the configuration of the air cleaning device in the third embodiment of the present invention, and the deodorizing filter in the first embodiment is also used in the third embodiment. The air cleaning device 6 includes a suction port 7, a dust collection filter 8, a vaporizing element 13, a deodorizing filter 9, and a blower fan 10 in order from the suction port side. As shown in FIG. 9, the gas flowing in the left direction (wind direction 12) from the suction port 7 passes through the dust collection filter 8 and the vaporizing element 13, then passes through the deodorization filter 9 and is humidified from the blowout port 11. Air is discharged in the upward direction (wind direction 12). The vaporizing element 13 is composed of a filter made of a non-woven fabric containing hygroscopic zeolite or silica, has a means for holding a solvent at the bottom, and has a water supply capability of sucking the solvent up to the upper surface of the vaporizing element 13. The solvent held in the vaporization filter is water, hydrogen peroxide water or electrolyzed water. By using the solvent hydrogen peroxide solution or electrolyzed water retained in the vaporization filter, the sterilizing ability can be enhanced.

  In the above structure, by making the adsorbent carried on the deodorizing filter hydrophobic, deterioration of the deodorizing performance can be suppressed even when the deodorizing filter is close to the vaporizing element.

  With the structure described above, the solvent held on the vaporizing element is sprayed on the deodorizing filter, and the deodorizing filter can be cleaned and the deodorizing performance can be recovered.

  As described above, according to the third embodiment, all of the sucked air passes through the vaporizing element for humidification, the adsorbent carried on the deodorizing filter is made hydrophobic, and the solvent hydrogen peroxide solution or Since the electrolyzed water is used, the sterilizing ability can be enhanced while suppressing the deterioration of the deodorizing performance. Further, the deodorizing performance can be recovered by washing the deodorizing filter with a solvent held on the vaporizing element.

1 is a configuration diagram showing a deodorizing filter in Embodiment 1 of the present invention. It is the figure which compared the deodorizing rate performance per catalyst carrying amount of the honeycomb-shaped deodorizing filter in Embodiment 1 of this invention, and the deodorizing filter of this invention. It is the figure which compared the deodorizing rate performance per filter volume of the conventional deodorizing filter in Embodiment 1 of this invention and the deodorizing filter of this invention. It is a figure which shows the relationship between the catalyst carrying amount in Embodiment 1 of this invention, and the amount of powder falling. It is the figure which compared the acetaldehyde removal performance of the honeycomb-shaped deodorizing filter in Embodiment 1 of this invention, and the deodorizing filter of this invention. It is a figure which shows the relationship between the deodorizing filter of the mesh structure in Embodiment 1 of this invention, and a wind direction. It is side surface sectional drawing which shows Embodiment 1 of the air purifying apparatus to which the deodorizing filter of this invention is applied. It is sectional drawing which shows the structure of the air purifying apparatus in Embodiment 2 of this invention. It is sectional drawing which shows the structure of the air purifying apparatus in Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Deodorizing filter, 2 Catalyst, 3 Adsorbent, 4 Fiber, 5 Filter frame, 6 Air cleaning device, 7 Air inlet, 8 Dust collection filter, 9 Deodorizing filter, 10 Blower, 11 Air outlet, 12 Air direction, 13 Vaporization element , 14 water storage tank, 15 water storage tray.

Claims (10)

A catalyst that decomposes harmful gases and unpleasant odors in the air;
An adsorbent that adsorbs harmful gases and unpleasant odors in the air;
Fibers carrying the catalyst and the adsorbent;
In a deodorizing filter provided with a frame that accommodates this fiber,
When the volume of the frame (hereinafter referred to as the filter volume) is Vcm ³ and the filter deodorization rate is η%, η ≧ 0.15 × V, and the wind speed of the air passing through the frame is 1 m / s The deodorizing filter is characterized in that the pressure loss P is 35 Pa or less and the filter volume V is 600 cm ³ or less. A catalyst that decomposes harmful gases and unpleasant odors in the air;
An adsorbent that adsorbs harmful gases and unpleasant odors in the air;
A fiber carrying the catalyst and the adsorbent, and
A deodorizing filter, wherein the fiber has a diameter of 5 to 30 μm, the basis weight of the fiber is 40 to 400 g / m ^2, and the supported amount of the adsorbent and the catalyst is 100 to 900 g / m ² .   The deodorizing filter according to claim 2, wherein the fiber is made of an inorganic material mainly composed of silicon oxide, transition metal, or carbon, or a polymer organic material.   The deodorizing filter according to claim 2 or 3, wherein a main component of the catalyst is a metal oxide, a noble metal, or a metal oxide and a noble metal.   The deodorizing filter according to any one of claims 2 to 4, wherein the adsorbent is made of at least one of zeolite, silica gel, activated carbon, and porous silica.   The deodorizing filter according to claim 1, wherein all the fibers accommodated in the frame are formed so as to be parallel to the opening surface of the frame. The deodorizing filter according to claim 1 is provided,
This deodorizing filter is used as an antibacterial filter. A dust collection filter that purifies dust floating in the air;
The deodorizing filter according to any one of claims 1 to 6,
With a fan that sucks air and exhausts it to the outside,
The air cleaning device, wherein the deodorizing filter is disposed between the dust collecting filter and the fan. A water storage tank,
A water storage tray that receives and stores water from the water storage tank;
A vaporizing element that sucks up the water stored in the water storage tray and vaporizes the sucked-up water by the air sucked by the fan;
The air purifier according to claim 8, wherein the vaporizing element is disposed between the deodorizing filter and the fan. A water storage tank,
A water storage tray that receives and stores water from the water storage tank;
A vaporizing element that sucks up the water stored in the water storage tray and vaporizes the sucked-up water by the air sucked by the fan;
9. The air purifier according to claim 8, wherein the vaporizing element is disposed between the dust collection filter and the deodorizing filter and sprays humidified air on the deodorizing filter.

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