JP5808030B1 - Air purifier - Google Patents

Abstract

To provide an air cleaning device capable of sterilizing airborne fungi and the like in the air, preventing accumulation of dirt in treated water, and having a high air deodorizing ability. An air purifying apparatus having a water storage unit containing treated water, an air intake unit that takes air into the water storage unit from the outside, and an exhaust unit that discharges air from the water storage unit to the outside. A water supply pipe having one end connected to the water storage section and the other end provided inside the air intake section, a circulation pump for supplying treated water from one end of the water supply pipe to the other end, and the water supply A water injection nozzle provided at the other end of the water pipe for injecting treated water; and an ozone generating and decomposing apparatus for supplying ozone gas to the treated water and irradiating the treated water to which ozone is supplied with ultraviolet rays. An air purifier characterized by. [Selection] Figure 3

Description

  The present invention relates to an air cleaning device, and more specifically, can sterilize airborne fungi and the like in the air, can prevent accumulation of dirt in treated water, and has high air deodorizing ability. Relates to the device.

  Conventionally, an air cleaning device having a deodorizing function has been provided. As a deodorizing method using an air purifier, a wet deodorizing method is widely known in which water and air are brought into contact with each other to remove substances that are present in the air and cause bad odors. A specific example of a wet deodorization apparatus that deodorizes air by a wet deodorization method is a scrubber.

  As an example of the wet deodorizing apparatus, there is an apparatus that sprays treated water on the contact material in a tower filled with the contact material. In this apparatus, the treated water is brought into contact with the contact material by flowing the treated water down in the tower. Next, the air to be cleaned passes upward from below through the contact material to which the treated water adheres. While the air to be cleaned passes through the contact material, the droplets of treated water adhering to the surface of the contact material and the air to be cleaned come into gas-liquid contact. At the time of gas-liquid contact, the substance that is the source of the odor present in the air to be cleaned is dissolved in water, and the air to be cleaned is deodorized. In addition, the apparatus in which the direction of progress of the treated water and the direction of the clean air is reversed may be referred to as a countercurrent wet deodorization apparatus.

  Patent Document 1 discloses a wet deodorization apparatus including an adsorption filter that is an example of a filler. Specifically, “an adsorption filter that adsorbs the malodorous component contained in the air sucked from the intake port is disposed in a manner in which the water sprayed from the water spray pipe is poured” (Patent Document 1). (Refer to claim 3), "The malodorous component contained in the air adsorbed from the air inlet is adsorbed by the adsorption filter disposed in the case" (see paragraph No. 0010 of Patent Document 1). Has been. However, the wet deodorization apparatus provided with the contact material is large, has a problem that the manufacturing cost and operation cost of the apparatus are high, and the installation location of the apparatus is limited. In addition, many fine gaps are formed on the surface and inside of the contact material. When the gas to be cleaned moves so as to sew such fine gaps, the air to be cleaned may pass through the contact material without coming into contact with the droplets of treated water. Therefore, in the wet deodorization apparatus provided with the contact material, air that has not been sufficiently deodorized may be exhausted, and there is a problem that the deodorization efficiency is low. Therefore, a wet deodorizing apparatus that does not include a contact material has been developed.

  As another example of the wet deodorization apparatus, without providing a contact material in the tower, the gas to be cleaned is vented from the upper part to the lower part in the tower, and the treated water is sprinkled from the upper part to the lower part in the tower. Apparatus. An apparatus in which the traveling direction of the treated water and the traveling direction of the air to be cleaned are the same is sometimes referred to as a co-current type wet deodorization apparatus. A wet deodorizing apparatus that does not include a contact material may not have sufficient gas-liquid contact efficiency and may not be sufficiently cleaned. Therefore, it has been conventionally performed to improve the air cleaning function by dissolving acid or alkali, hydrogen peroxide, sodium hypochlorite, ozone or the like in treated water.

  For example, in Patent Document 2, “strongly acidic water and strong alkaline water produced by a water electrolyzer is used to deodorize and sterilize bacteria in the air with strong acidic water. A "deodorizing and sterilizing air cleaning device characterized by purifying airborne dust, protein-based and lipid-based dirty air" has been disclosed (see claim 1 of Patent Document 2).

  However, the wet deodorization method using strong acidic water and strong alkaline water has a problem that organic matter cannot be sufficiently decomposed and odor remains in air after contact with water. Further, strongly acidic water can dissolve an alkaline gas such as ammonia that exhibits alkalinity in a water-soluble state, but cannot dissolve an acidic gas such as hydrogen sulfide that exhibits acidity in a water-soluble state. Strong alkaline water can dissolve acidic gas, but cannot dissolve alkaline gas. Therefore, in order to completely remove substances that cause odors in the air, both strong acidic water and strong alkaline water must be used, and there is a problem that the structure of the apparatus becomes complicated.

JP 2007-6906 JP 2009-487

  The problem to be solved by the present invention is to provide an air cleaning device that can sterilize airborne fungi and the like in the air, prevent accumulation of dirt in treated water, and has a high air deodorizing ability. It is to be.

Means for solving the problems are as follows:
(1) An air purifier having a water storage unit containing treated water, an air intake unit that takes air into the water storage unit from the outside, and an exhaust unit that discharges air from the water storage unit to the outside, One end is connected to the water storage section, the other end is provided inside the intake section, and the treated water is supplied from one end to the other end of the water supply pipe and is stored in the water storage section. A circulation pump that circulates all treated water within one minute , a water injection nozzle that is provided at the other end of the water supply pipe, and that injects treated water, ozone gas is supplied to the treated water, and ozone gas is supplied. An ozone generation and decomposition device that irradiates treated water with ultraviolet rays,
The air purifier is characterized in that the air and the treated water can move in a parallel flow,
(2) The air purifying apparatus according to (1), wherein the ozone generation / decomposition apparatus irradiates ultraviolet rays having a wavelength of 140 nm or more and 340 nm or less,
(3) The water injection nozzle includes an outlet having a diameter of 5 mm or more and 10 mm or less,
The air purifier according to (1) or (2), wherein an ejection pressure having a magnitude of 1.0 MPa or more and 1.3 MPa or less can be pressed against the treated water at the ejection port .

  In the air purifying apparatus of the present invention, the treatment water is irradiated with ultraviolet rays, whereby ozone in the water is decomposed and active oxygen species are generated. Active oxygen species have higher oxidizing power than ozone and chlorine. In the present invention, the water containing the active oxygen species is jetted from the water jet nozzle vigorously as mist-like water droplets having an extremely fine particle size. The mist-like water droplets thus ejected have a large surface area ratio per volume and a high contact efficiency with the gas. Therefore, on the surface of fine water droplets, substances that cause odors present in the air (hereinafter sometimes referred to as “bad odor-causing substances”), bacteria and fungi floating in the air, etc. , Sometimes referred to as “floating fungi”). Furthermore, the malodorous substances present in the air are strongly oxidized by the active oxygen species present in the water droplets. By using the air purifying apparatus according to the present invention, the malodor causing substance can be more reliably oxidized and decomposed, and air with less odor can be obtained.

  In the air purifying apparatus according to the present invention, the floating fungi in the air are strongly oxidized and sterilized by the active oxygen species present in the water droplets. Therefore, by using the air cleaning apparatus according to the present invention, the floating fungi can be more reliably oxidized and sterilized, and clean air with a small number of floating fungi can be obtained.

  By operating the air cleaning device for a long time, dirt gradually accumulates in the treated water circulating in the device. Specifically, organic matter taken in from the air and microorganisms such as suspended fungi accumulate in the treated water. If dirt accumulates in the treated water, the ability of the treated water to purify the air decreases, so it is necessary to replace the accumulated treated water with clean new treated water. Moreover, when dirt accumulates in the treated water, sludge is formed on the bottom of the water storage section and the inner wall surface of the water pipe, and the inside of the air purifier needs to be cleaned. The air cleaning apparatus of the present invention can decompose active substances present in the treated water by generating active oxygen species having strong oxidizing power in the treated water, and kill microorganisms present in the treated water. Therefore, when using an air purifying apparatus for a long period of time, the frequency of replacement of treated water and the frequency of cleaning operations inside the apparatus can be reduced.

FIG. 1 is a schematic view showing an example of an air cleaning device according to the present invention. FIG. 2 is a schematic diagram showing an example of an ozone generation and decomposition apparatus according to the present invention. 3 is a cross-sectional view taken along the line AA ′ in FIG. FIG. 4 is a cross-sectional view showing an example of a water ejection nozzle in the present invention.

  The air cleaning device of the present invention includes a water storage unit, a water supply pipe, a circulation pump, an intake unit, and an exhaust unit.

  The water storage unit has a function of containing treated water therein. A part of the treated water stored in the water storage part is sent to the intake part by the water supply pipe and the circulation pump, and then returned to the water storage part again. Thereby, treated water circulates inside the apparatus. The shape and size of the water reservoir can be appropriately changed as long as the effects of the present invention are achieved. The water storage part should just be a magnitude | size which can accommodate the 80L or more and 400L or less treated water, for example.

  One end of the water supply pipe is provided in the water storage section, and the other end is provided inside the intake section. One end of the water supply pipe only needs to be provided at a position lower than the surface of the treated water stored in the water storage section so that the treated water can pass through the inside of the water supply pipe. The intake portion is preferably provided above the water storage portion. Therefore, the other end of the water pipe may be provided at a position higher than one end of the water pipe. A circulation pump is provided so that treated water can be pumped from one end of the water pipe to the other end of the water pipe. The circulation pump may be provided in the middle of the water supply pipe. One end of the water supply pipe is connected to the bottom surface of the water storage section or the side surface near the bottom, and the other end of the water supply pipe is located inside the intake section and connected to the water injection nozzle.

  The circulation pump pumps up the treated water stored in the water storage unit and supplies the treated water to the intake unit. The treated water supplied to the intake section by the circulation pump is returned to the water storage section again after contacting the air in the intake section. In this way, the treated water circulates inside the apparatus repeatedly and can be used for air purification, thus providing a water saving effect. A conventionally known pump may be used as the circulation pump. The amount of water circulated by the circulation pump can be appropriately changed in design depending on the odor concentration and air volume of the air to be cleaned. For example, the amount of water circulated by the circulation pump may be 200 L / min or more and 1000 L / min or less. Moreover, it is desirable that the amount of water circulated by the circulation pump is the amount of water that can circulate all of the treated water stored in the water reservoir within one minute. For example, if the amount of water stored in the water storage unit is 80L and the circulating water amount of the circulation pump is 200L / min, the calculation of 80/200 will result in a calculation within about 24 seconds, that is, within one minute. All the treated water contained in the water is circulated. The active oxygen species generated in the treated water may disappear in a relatively short time. By circulating all the treated water within one minute as described above, it is possible to prevent the active oxygen species from being decomposed while the treated water stays in the water storage part for a long time, and the treated water sent to the intake part. It is possible to prevent the oxidation function from being lowered.

  The intake section sucks air from the outside of the device. The sucked air moves through the intake section and reaches the water storage section. The intake portion usually forms a cylindrical body. The planar shape of the intake portion is not particularly limited, and the shape of the intake portion may be, for example, a cylindrical shape or a rectangular tube shape. The intake portion may be provided with an intake port as an opening that communicates with the water storage portion at one end of the cylindrical body and can take in external air at the other end. The intake port of the intake unit is preferably provided at a higher position than the one end of the intake unit. Thereby, the air sucked from the intake port moves downward inside the intake portion. Moreover, the water injection nozzle connected to the other end of the water supply pipe and the other end of the water supply pipe is provided inside the intake portion. Moreover, the aspect in which external air is taken in in an intake part is not restrict | limited in particular. As an example, an intake fan may be provided in a part of the intake section so that air is forcibly taken in. As another example, as described later, an exhaust fan is provided in the exhaust part, and by operating the exhaust fan, the inside of the intake part is made negative pressure so that air is sucked from the intake port to the inside of the intake part. Also good. Further, when the treated water is injected from the water injection nozzle so as to form a high-speed, high-pressure water flow, the pressure in the vicinity of the intake port becomes negative due to the strong water flow pressure, and air is drawn into the intake portion. When air is drawn into the intake portion, air in the water storage portion is pushed out from the exhaust port. Therefore, the treated water is ejected from the water ejection nozzle so as to form a high-pressure and high-pressure water flow, thereby enabling intake and exhaust in the apparatus without using the intake and exhaust fans.

  The water ejection nozzle can eject fine water droplets. The particle size of the treated water sprayed from the water spray nozzle is not particularly limited, but is particularly preferably 1 μm or more and 10 μm or less. When the particle size of the treated water is within the above numerical range, the ratio of the surface area per volume in the water droplets increases and the contact efficiency between the water droplets and the air increases. Reactive oxygen species and ozone are likely to react. Further, the water injection nozzle is particularly preferably provided with a jet outlet having a diameter of 5 mm or more and 10 mm or less and capable of pressing a jet pressure having a magnitude of 1.0 MPa or more and 1.3 MPa or less to the treated water at the jet outlet. . When the water jet nozzle is jetted from the jet nozzle of the size with the jet pressure of the size, fine water droplets are jetted from the jet port while forming a jet-like water flow in a high pressure and high speed state. The jet-like water flow and air have high gas-liquid contact efficiency, and the air is prevented from passing through the intake section without coming into contact with water droplets.

  The exhaust part should just form the cylindrical body normally. The planar shape of the exhaust part is not particularly limited, and the shape of the exhaust part may be, for example, a cylindrical shape or a rectangular tube shape. The exhaust part is provided with an exhaust port as an opening through which one end of the cylindrical body communicates with the water storage part and air can be discharged to the outside at the other end. The air taken in from the intake section reaches the water storage section after coming into contact with water droplets in the intake section, and then is discharged to the outside through the exhaust section. By causing gas-liquid contact in the intake section, clean air with a low content of malodor-causing substances and airborne fungi can be obtained. Therefore, clean air is supplied from the exhaust unit to the outside of the apparatus. In order to discharge air in the exhaust part, for example, a fan or blower such as a blower may be provided in a part of the exhaust part, and the exhaust fan may be operated.

  In addition, a commercially available dust collector can be used as an apparatus provided with a water storage part, a water supply pipe, a circulation pump, an intake part, and an exhaust part. For example, a product called Kesmac manufactured by Ricken Co., Ltd. can be used.

  The ozone generating and decomposing apparatus supplies ozone gas to the treated water and irradiates the treated water to which the ozone is supplied with ultraviolet rays. The ozone gas may be any gas containing ozone, and is preferably a gas formed by replacing part or all of oxygen in the atmosphere with ozone. Specifically, the ozone generation and decomposition apparatus is provided outside the water storage unit, takes in a part of the treated water stored in the water storage unit, blows ozone gas into the taken treated water, and then irradiates the treated water with ultraviolet rays. Any device may be used. More specifically, the ozone generating and decomposing apparatus preferably irradiates ultraviolet rays having a wavelength of 140 nm or more and 340 nm or less. Ultraviolet light having such a wavelength can generate ozone from oxygen molecules and can decompose ozone to generate active oxygen species.

  An example of the reaction that occurs when the ozone generation and decomposition apparatus is irradiated with ultraviolet rays is shown below.

First, the reaction shown by the following formulas (1) and (2) occurs when ultraviolet rays having a relatively short wavelength of 140 nm or more and less than 240 nm are irradiated.
O ₂ → 2O (1)
_{O + O 2 + M → O} 3 + M ··· (2)

In the above formula (1), the oxygen molecule O ₂ is photodissociated to generate a ground state oxygen atom O. As shown in the formula (2), the oxygen atom O reacts with the oxygen molecule O ₂ through a third substance M that absorbs excess energy, for example, a nitrogen molecule or an oxygen molecule, and the ozone O _3. Produces.

Next, the reaction shown by the following formulas (3) and (4) occurs by irradiation with ultraviolet rays having a relatively long wavelength of 240 nm or more and less than 340 nm.
O ₃ → O ₂ + O (3)
_{O + H 2 O → 2 (} · OH) ··· (4)

In the formula (3), ozone is photodissociated into excited oxygen molecules O ₂ and excited oxygen atoms O by relatively long wavelength ultraviolet rays. Each of the excited oxygen molecule and the excited oxygen atom has an empty electron orbit in which electrons are not accommodated, and has a strong oxidizing power. Further, the excited oxygen atom generated in the formula (3) may react with water molecules as in the formula (4) to generate a hydroxyl radical / OH. The hydroxyl radical has an unpaired atom, is excellent in the property of taking electrons from other atoms, and has a high oxidation ability. Excited oxygen molecules, excited oxygen atoms, hydroxyl radicals, and the like have particularly higher oxidizing ability than ozone molecules. Therefore, the treated water containing excited oxygen molecules, excited oxygen atoms, and hydroxyl radicals that can be produced in the ozone generation and decomposition apparatus has a high ability to decompose malodorous substances and sterilize floating fungi. .

  In addition to the reaction mechanism represented by the above formulas (3) and (4), hydroxy radicals (OH.) May also be generated when high-concentration ozone elutes in water.

The active oxygen species generated in the ozone generator cracker, oxygen molecules in the excited state described above, the oxygen atom in the excited state, and in addition to the active oxygen species other than hydroxyl radicals, O ₂ · ^- superoxide anion radicals represented by And hydroxy peroxy radicals represented by HO ₂ . OH ·, HO ₂ ·, and O ₂ · ⁻ have a pair of unpaired atoms and are one type of free radicals that have a high ability to oxidize other substances. The active oxygen species in the present invention does not include ozone.

  Although not shown in FIGS. 1 to 4, a microbubble generator that subdivides the bubbles of ozone gas blown into the treated water and generates microbubbles of ozone gas in the treated water may be provided. Ozone decomposition is promoted by generating ozone gas microbubbles in the treated water.

  In the present invention, a specific example of the malodor causing substance that is oxidatively decomposed is not particularly limited. Specific examples of odor-causing substances are normal butyric acid generated in composting facilities, sulfide compounds such as trimethylamine and hydrogen sulfide, which are the source of odors in garbage, ammonia, which is the source of odors in toilets, and paint Examples thereof include hydrocarbon group compounds. When various organic substances are oxidatively decomposed, sulfuric acid, nitric acid, etc. are generated according to water, carbon dioxide, and contained elements in the organic substances. When hydrogen sulfide and ammonia are oxidatively decomposed, sulfuric acid and nitric acid are generated, respectively.

  Further, specific examples of the floating fungi sterilized by the air cleaning device include bacteria such as Escherichia coli and fungi such as filamentous fungi.

  Next, an example of an ozone generation and decomposition apparatus will be specifically described with reference to FIG.

  The ozone generation / decomposition apparatus 21 shown in FIG. 2 has an inflow pipe 22, an ultraviolet irradiation tank 23, and a return pipe 24. The inflow pipe 22 and the return pipe 24 are each connected to a water storage unit, and can make the treated water flow into the ultraviolet irradiation tank 23 and discharge the treated water from the ultraviolet irradiation tank 23. The ultraviolet irradiation tank 23 forms a bottomed cylindrical body. The ultraviolet irradiation tank 23 communicates with the inflow pipe 22 and the return pipe 24 and contains treated water inside. Moreover, the hollow part 25 is formed toward the downward direction from the center vicinity of the upper surface in a cylindrical body. An ultraviolet irradiation lamp 26 is disposed in the hollow portion 25. In the ultraviolet irradiation tank 23, an ultraviolet transmissive glass 27 is provided on the inner wall surface forming the hollow portion 25. The ultraviolet rays generated by the ultraviolet irradiation lamp 26 pass through the ultraviolet transmissive glass 27 and are irradiated to the treated water in the ultraviolet irradiation tank 23. As the ultraviolet irradiation lamp 26, a conventionally known lamp that can irradiate ultraviolet rays having a wavelength of 140 nm or more and 340 nm or less may be used. Moreover, the ultraviolet transmissive glass 27 should just be a member which can permeate | transmit ultraviolet rays with a wavelength of 140 nm or more and 340 nm or less, and quartz glass is used normally.

  As shown in FIG. 2 and FIG. 3 which is a cross-sectional view, the ultraviolet irradiation tank 23 has a substantially cylindrical shape with a substantially cylindrical hollow portion inside. The planar shape of the ultraviolet irradiation tank is not limited to the circular shape as shown in FIG. 3, and may be an elliptical shape, a polygonal shape, or the like.

  When the ozone generating / decomposing apparatus 21 is activated, ultraviolet rays are irradiated from the ultraviolet irradiation lamp 26. Ozone is generated from oxygen molecules in the air existing in the hollow portion 25 by ultraviolet rays having a relatively low wavelength of less than 240 nm irradiated from the ultraviolet irradiation lamp 26, and ozone gas containing ozone is generated. The ozone gas generated in the hollow portion 25 is sucked into the ozone gas pipe 32 having one end accommodated in the hollow portion 25 by the air pump 31. The hollow portion 25 is brought into a negative pressure state by the suction of the air pump 31. Atmospheric air containing oxygen is taken into the hollow portion 25 in the negative pressure state from the outside of the ozone generation and decomposition apparatus 21. The upper lid 33 may be provided with an air hole so that the air is taken into the hollow portion 25, or the upper lid 33 itself may be a porous body capable of air exchange.

  The other end of the ozone gas pipe 32 is connected to the inflow pipe 22. The ozone gas that has moved through the ozone gas pipe 32 is press-fitted into the treated water in the inflow pipe 22 at a branch point with the inflow pipe 22. When the ozone gas is pressed into the treated water, ozone gas bubbles 30 are generated in the treated water. The treated water containing the bubbles 30 of the ozone gas reaches the ultraviolet irradiation tank 23 and rises in the ultraviolet irradiation tank 23 toward the return pipe 24. The direction in which the treated water proceeds is indicated by a solid line arrow in FIG. In the ozone generating and decomposing apparatus 21, the method of passing the treated water through the inflow pipe 22, the ultraviolet irradiation tank 23, and the return pipe 24 in this order is not particularly limited. For example, a water pump may be used.

  In the process in which the treated water rises in the ultraviolet irradiation tank 23, the ultraviolet rays generated from the ultraviolet irradiation lamp 26 pass through the ultraviolet transmissive glass 27 and are irradiated to the treated water. The irradiation direction of ultraviolet rays is indicated by a dotted arrow in FIG. Ozone present in the treated water is decomposed by ultraviolet rays having a relatively long wavelength of 240 nm or more, and active oxygen species are generated. Treated water containing ozone and active oxygen species is returned to the water storage section through the return pipe 24. In addition, the flow rate of the treated water that is passed through the ozone generation and decomposition apparatus 21 is not particularly limited, and can be appropriately changed in design.

  Next, a specific example of the water injection nozzle according to the present invention will be described with reference to the example shown in FIG.

  The water injection nozzle 9 forms a tapered cylindrical body, one end surface 9A is connected to the water supply pipe 8, and the other end surface 9B is exposed to the outside. A treated water conduction path 41 is formed inside the water injection nozzle 9 in a hollow shape. The treated water conducting path 41 forms an incident port 41A on one end surface 9A, and forms an ejection port 41B on the other end surface 9B.

  It is desirable that the incident port 41A has a larger diameter than the jet port 41B. For example, as shown in FIG. 4, the treated water conducting path 41 includes a tapered portion and a parallel portion so that the inner wall surface forms a Y shape in the cross-sectional shape. By setting the treated water conducting path 41 to include a tapered portion and a parallel portion, it is possible to prevent turbulent flow from occurring inside the water ejection nozzle 9. One end of the tapered portion has substantially the same diameter as the water pipe 8 and is surface-joined with the other end 8B of the water pipe. Further, the other end of the tapered portion is smaller than the water supply pipe 8, has a diameter substantially the same as that of the jet nozzle 41B, and is surface-joined with one end of the parallel portion. The parallel portion extends downward while maintaining a diameter of substantially the same size, and forms a jet port 41B at the other end. The treated water flowing through the water supply pipe 8 enters the treated water conduction path 41 from the incident port 41A, becomes high pressure while traveling through the tapered tapered portion, and is ejected as a jet-like water stream from the ejection port 41B. The diameters of the ejection port 41B and the incident port 41A are appropriately changed depending on the amount of circulating water, the diameter of the water supply pipe 8, and the like. For example, the diameter of the incident port 41A is 25 mm to 30 mm, and the diameter of the ejection port 41B is 5 mm. It is desirable that it is 10 mm or less. Moreover, it is desirable that the ejection pressure at the ejection port 41B be 1.0 MPa or more and 1.3 MPa or less. The diameters of the entrance 41A and the jet 41B are measured by using a conventionally known nozzle diameter measurement method. In addition, when the planar shapes of the entrance 41A and the ejection port 41B are circular, the diameters of the respective circles can be set as the diameter of the entrance 41A and the diameter of the ejection port 41B.

  The treated water jetted from the jet nozzle 41B becomes fine droplets, and forms a jet-like water stream having high pressure and high speed. Further, the treated water is ejected radially from the ejection port 41B. As shown by a plurality of arrows in FIG. 4, when the water flow of the treatment water ejected from the ejection port 41 </ b> B is observed from the lateral direction perpendicular to the axial direction of the water ejection nozzle 9, the water flow of the treatment water has a substantially fan shape. Observe to form. The substantially fan-shaped center angle θ1 formed by this water flow is preferably 40 ° or more and 50 ° or less. The center angle θ1 is sometimes referred to as an injection angle or a spray angle. When the central angle is 40 ° or more, a water flow of the treated water is formed in a relatively wide range, and the possibility that the air moving in the same downward direction as the treated water comes into contact with the treated water is increased. It is possible to prevent the intake portion from moving without being performed. Furthermore, when the central angle is 50 ° or less, it is possible to prevent the jet-like treated water flow in a high pressure state from directly hitting the inner wall surface of the intake portion and damaging the inner wall surface of the intake portion. Furthermore, the length T1 in the axial direction of the water injection nozzle 9 is preferably 8 cm or more and 12 cm or less. The central angle θ1 and the length T1 can be appropriately changed according to various conditions.

  In the water jet nozzle 9, it is preferable that only one jet outlet 41B is provided. If the water jet nozzle 9 is provided with a plurality of jet outlets 41B, pressure loss may occur, and a high jet pressure of 1.0 MPa or more and 1.3 MPa or less may not be generated. Furthermore, by providing a plurality of jet nozzles 41B and expanding the region where the treated water is jetted, the flow of jet-like treated water in a high pressure state directly hits the inner wall surface of the intake portion, and the inner wall surface of the intake portion is damaged. May end up.

  Next, the operation of the air cleaning device of the present invention will be specifically described with reference to FIG.

  First, in order to operate the air purifying apparatus 1 of the present invention, the exhaust fan 2 is activated. Due to the exhaust fan 2, the intake port 3 becomes negative pressure, and external air passes through the intake port 3 and is taken into the intake unit 4. The air sucked from the intake port 3 descends inside the intake part 4 toward the water storage part 6. In FIG. 1, the air movement path is indicated by a dotted arrow. The exhaust fan 2 may not be used when the intake water 3 is negatively pressured by the high-pressure injection of the treated water from the water injection nozzle 9 and the intake portion 4 performs intake air. In addition, the quality of the treated water stored in the water storage unit 6 is not particularly limited before the air cleaning device 1 is activated. For example, tap water may be stored in the water storage unit as treated water.

  An ozone generation / decomposition device 21 is connected to the water reservoir 6. The treated water stored in the water storage unit 6 is taken into the ozone generation / decomposition device 21 through the inflow pipe 22, subjected to ozone injection and ultraviolet irradiation, and then passed through the return pipe 24 to the water storage unit 6. Is returned. In the ozone generating and decomposing apparatus 21, ozone and active oxygen species are generated in the treated water. Therefore, ozone and active oxygen species exist in the treated water returned to the water storage unit 6. In addition, in FIG. 1, the movement path | route of a treated water is shown by the solid line arrow.

  The strainer 12 is preferably provided in a part of the return pipe 24. By removing solids such as dust existing in the treated water in the strainer 12, the solids are discharged from the outlet of the return pipe 24, and the solids are prevented from floating along with the bubbles. Further, the outlet of the return pipe 24 is preferably provided in the vicinity of one end 8A of the water pipe. As a result, the treated water containing the active oxygen species released from the return pipe 24 is quickly taken into the water supply pipe 8 and then jetted from the water jet nozzle 9. Therefore, it is possible to prevent the active oxygen species from being decomposed while the treated water returned from the return pipe 24 stays in the water storage unit 6. More specifically, it is preferable that the return pipe 24 is provided so that the outlet of the return pipe 24 and the one end 8A of the water supply pipe face each other.

  The treated water in the water storage unit 6 moves through the water supply pipe 8 by the circulation pump 7. A water injection nozzle 9 is provided at the other end 8B of the water pipe. The treated water is discharged from the water jet nozzle 9 and forms a jet-like water stream that is in a high pressure and high speed state. The treated water moves from the upper direction to the lower direction in the same direction as the air taken in from the outside in the intake section 4 and reaches the water storage section 6. In the intake section 4, it is desirable that the treated water and the air move in the same direction and in a parallel flow. In the present invention, since the water jet nozzle 9 forms a water flow of high-pressure and high-speed treated water, it is difficult to move the treated water and air in opposite directions in a countercurrent manner. When the treated water and the air are moved in a cocurrent manner, the air is caught in the treated water stream, so that the air and the treated water can be reliably brought into contact with each other. After the treated water is accommodated in the water storage unit 6, the treated water is again sprayed from the water spray nozzle 9 through the water supply pipe 8. On the other hand, the air that has reached the water storage unit 6 is discharged to the outside of the apparatus through the exhaust unit 5 by the exhaust fan 2. Although not shown in FIG. 1, a replenishment water channel may be provided in the water storage unit 6 so that treated water can be replenished to the water storage unit 6 from the outside. The quality of the treated water replenished to the water storage unit 6 is not particularly limited, and tap water may be replenished as treated water. While the treated water is repeatedly circulated in the apparatus, the water gradually evaporates and the water vapor is discharged from the exhaust part, so that impurities in the treated water are concentrated. By replenishing treated water to the water storage unit 6, the concentration of impurities in the treated water is prevented and the quality of the treated water is maintained, so that it is possible to prevent the air cleaning function due to the treated water from deteriorating. Moreover, although not shown in FIG. 1, a drainage channel that can discharge treated water in the water storage section to the outside may be provided. By discharging impurities such as suspended solids contained in the treated water from the drainage channel together with the treated water, the quality of the treated water stored in the water storage unit 6 can be kept constant.

  Since the treated water discharged from the water jet nozzle 9 forms fine water droplets, the contact efficiency with air is high. When the water droplet comes into contact with air, the malodorous substance present in the air is oxidized and decomposed by the active oxygen species present in the water droplet. Therefore, the bad odor-causing substance existing in the air is efficiently decomposed in the intake section 4, and clean air with less odor is obtained while the air moves from the intake section 4 to the water storage section 6.

When water droplets of treated water come into contact with air, airborne fungi in the air are oxidized and sterilized by active oxygen species. Therefore, the floating fungi present in the air are efficiently sterilized in the air intake unit 4, and clean air with less airborne fungi is obtained while the air moves from the air intake unit 4 to the water storage unit 6. Specifically, by using the air cleaning apparatus according to the present invention, clean air having about 10 ² cells / ml of floating bacteria can be obtained from air having about 10 ⁵ cells / ml.

  In the air taken in from the outside of the apparatus, dust may be suspended in dust or sand having a relatively large particle size. These dusts are adsorbed by the treated water inside the intake section 4, fall to the water storage section 6, and are trapped in the treated water in the water storage section 6. In the present invention, since fine water droplets are jetted downward from the water jet nozzle 9 at high pressure and high speed, dust in the air strongly falls together with the water flow. Therefore, dust existing in the air is efficiently trapped in the treated water in the intake section 4, and clean air with less dust is obtained while the air moves from the intake section 4 to the water storage section 6.

  As described above, clean air with less odor-causing substances, airborne fungi, dust and the like can be obtained from the air taken in from the intake port 3. Clean air is discharged from the exhaust section 5 to the outside. Therefore, clean air can be supplied to the outside of the apparatus by the air cleaning apparatus 1 of the present invention.

The treated water circulates inside the air cleaning device 1. As the treated water circulates repeatedly, the dirt adsorbed in the treated water in the intake section gradually accumulates in the treated water. Usually, the treated water in which dirt is accumulated deteriorates the air cleaning function in the intake section, and therefore needs to be replaced with new treated water with less dirt. In the air cleaning device 1 of the present invention, the treated oxygen in the water storage unit 6 contains active oxygen species. This active oxygen species can oxidize and decompose organic substances and the like that cause soil in the treated water, and can sterilize microorganisms such as bacteria in the treated water. Further, the organic matter and the microorganisms are oxidized by irradiating the ozone generation and decomposition apparatus 21 with ultraviolet rays. In particular, it is known that about 99.9% of Bacillus subtilis in water is killed by irradiating ultraviolet rays in an amount of 20 mJ / cm ² or more. Therefore, even if the air purifying apparatus of the present invention is operated for a long time and circulates the treated water repeatedly, dirt is not easily accumulated in the treated water. The air cleaning device according to the present invention is less likely to deteriorate the air cleaning function without changing the treated water for a long period of time.

  The malodor causing substance dissolved in the treated water in the water storage unit 6 is oxidized and decomposed by the active oxygen species present in the treated water. Therefore, the malodorous component dissolved in the treated water in the water storage unit 6 is prevented from being volatilized and released from the exhaust unit 5 to the outside. Furthermore, since the active oxygen species has a sterilizing function, an adhesive slime is formed by the growth of microorganisms on the inner wall surfaces of the water storage unit 6, the water supply pipe 8, the intake unit 4, the exhaust unit 5, and the like. Can be prevented.

  In the air cleaning device 1 of the present invention, treated water exhibiting a sufficient deodorizing effect and sterilizing effect can be obtained by irradiating ultraviolet rays in an ozone generating and decomposing apparatus. Therefore, it is not necessary to inject chemicals such as hypochlorous acid and hydrogen peroxide into the treated water. In the present invention, it is not necessary to separately provide chemical injection equipment such as a chemical tank and a chemical injection pump, so that the initial cost is reduced, and since it is not necessary to continuously inject the chemical into the treated water, the running cost is also reduced.

  Moreover, while the treated water in this invention has sufficient deodorizing effect and sterilizing effect, a part of ozone in treated water is decomposed | disassembled by irradiation of a comparatively long wavelength ultraviolet ray. Therefore, it is possible to prevent a large amount of ozone gas from remaining in the air after contacting the treated water in the intake portion. Thereby, even if the air purifying apparatus 1 according to the present invention is installed in an area where a human lives, a gas containing a large amount of ozone gas is exhausted from the exhaust part, and does not adversely affect human health.

  The intake port 3 of the air cleaning device 1 of the present invention may be connected to an intake duct through which air before cleaning passes. Moreover, the exhaust port 10 of the air purifying apparatus which concerns on this invention may be connected with the exhaust duct which lets the air after cleaning pass. By providing the intake duct and the exhaust duct at the intake port and the exhaust port, it is possible to clean the polluted gas generated in a place away from the place where the air purifier is installed. For example, the air purifier 1 is installed in a room next to a cooking room that emits odor, one end of the intake duct and the exhaust duct is provided in the cooking room, and the other end of the intake duct and the exhaust duct is provided in the adjacent room. It connects with the port 3 and the exhaust port 10. Thereby, the air before cleaning in the cooking chamber passes through the intake duct, the air cleaning device 1 and the exhaust duct in order, and clean air is supplied to the cooking chamber.

  Next, examples will be described.

(1) Example 1
The air in the kitchen after cooking with garlic, pepper, olive oil, cheese, etc. was defined as clean air. The odor index and odor concentration of the air to be cleaned were measured by the method described later. The measurement results are shown in the column of number 1 in Table 1 below. The air to be cleaned was taken into a Kessack manufactured by Ricken Co., Ltd., which is a device provided with a water storage unit, an intake unit, an exhaust unit, a circulation pump, a water supply pipe, and a water injection nozzle in the present invention. Further, the ozone generation and decomposition apparatus 21 shown in FIG. 2 was connected to the water reservoir of Kesmac, and part of the treated water in the water storage section was taken into the ozone generation and decomposition apparatus. In the ozone generation and decomposition apparatus, ozone gas was blown into the treated water, and then the treated water containing the ozone gas was irradiated with ultraviolet rays. The irradiated ultraviolet rays contained light having a wavelength of about 340 nm or less, and peaks were observed particularly at wavelengths of 185 nm and 252 nm. The amount of water taken into the ozone generating and decomposing apparatus was about 30 L / min. In addition, the treated water in the water storage section was jetted downward from the water jet nozzle inside the intake section, and the liquid to be cleaned was moved in the process of moving the clean air taken in from the outside of the apparatus downward. About the air after discharged | emitted from the exhaust part, the odor index | exponent and the odor density | concentration were measured using the method mentioned later, and also the deodorizing efficiency was calculated. The results are shown in the column of number 3 in Table 1 below.

(2) Comparative Example 1
The experiment was performed in the same manner as in Example 1 except that the treated water was not treated using the ozone generating and decomposing apparatus. The results are shown in the column of number 2 in Table 1 below.

(3) Example 2
The experiment was conducted in the same manner as in Example 1 except that the air in the kitchen after chopping the onion was cleaned air. The results for the air to be cleaned are shown in the column of No. 4 in Table 1 below, and the results for the clean air after being cleaned by Kesmak are shown in the column of No. 5 in Table 1 below.

(4) Example 3
The experiment was conducted in the same manner as in Example 1 except that the air in the preparation room of the Chinese medicine factory was changed to clean air. The results for the air to be cleaned are shown in the column of No. 6 in Table 1 below, and the results of the clean air after being cleaned by Kesmak are shown in the column of No. 8 in Table 1 below.

(5) Comparative Example 2
The experiment was conducted in the same manner as in Comparative Example 1 except that the air in the pharmaceutical factory of the Kampo medicine factory was changed to clean air. The results are shown in the column of number 7 in Table 1 below.

(6) Example 4
The experiment was performed in the same manner as in Example 1 except that the air in the composting house where the compost was fermented was cleaned air. The results for the air to be cleaned are shown in the column of No. 9 in Table 1 below, and the results of the clean air after being cleaned with Kesmak are shown in the column of No. 10 in Table 1 below.

(Measurement of odor index and odor concentration)
A three-point comparative odor bag method was used for measuring the odor index and odor concentration. Specifically, the odor concentration was determined by measuring the dilution ratio of the odor when all of the six odor determiners no longer felt the odor. Further, a value obtained by multiplying the common logarithm of this odor concentration by 10 was calculated and used as the odor index.

(Calculation of deodorization efficiency)
By using the following formula (5), the deodorizing efficiency for the clean air before treatment was calculated for the examples and comparative examples.

Deodorization efficiency (%) = (odor concentration before treatment−odor concentration after treatment) / odor concentration before treatment × 100
(5)

  From the results of numbers 3, 5, 8, and 10 in Table 1, the odor index and the odor concentration are reduced in any example of clean air by bringing the treated water irradiated with ultraviolet rays into contact with the gas. I understand that. Comparing the results of Nos. 2 and 7 in which treated water not irradiated with ultraviolet rays was brought into contact with the gas and the results in Nos. 3 and 8 in which treated water irradiated with ultraviolet rays were brought into contact with the gas, It was shown that the odor index and odor concentration can be further reduced, and the deodorization efficiency is good.

DESCRIPTION OF SYMBOLS 1 Air purifier 2 Ventilator 3 Intake port 4 Intake part 5 Exhaust part 6 Reservoir part 7 Circulation pump 8 Water supply pipe 8A One end of water supply pipe 8B The other end of water supply pipe 9 Water injection nozzle 10 Outlet 11 Water surface 12 of treated water Strainer 21 Ozone generation and decomposition device 22 Inflow piping 23 Ultraviolet irradiation tank 24 Return piping 25 Hollow portion 26 Ultraviolet irradiation lamp 27 Ultraviolet transmission glass 28 Connector 29 Control device 30 Air bubble 31 Ozone gas piping 33 Upper lid 41 Treated water conduction path 41A Entrance 41B Spout

Claims (3)

An air purifier having a water storage section containing treated water, an intake section for taking air into the water storage section from the outside, and an exhaust section for discharging the air in the water storage section to the outside,
A water supply pipe having one end connected to the water storage unit and the other end provided inside the air intake unit;
A circulation pump that feeds treated water from one end of the water pipe to the other end and circulates all of the treated water contained in the water storage section within one minute ;
A water injection nozzle provided at the other end of the water pipe and for injecting treated water;
An ozone generating and decomposing apparatus that supplies ozone gas to the treated water and irradiates ultraviolet rays to the treated water to which the ozone gas is supplied,
The air cleaner is characterized in that the air and the treated water can move in the intake section in a parallel flow.   The air purification apparatus according to claim 1, wherein the ozone generation and decomposition apparatus irradiates ultraviolet rays having a wavelength of 140 nm or more and 340 nm or less. The water injection nozzle includes an outlet having a diameter of 5 mm or more and 10 mm or less,
The air purifier according to claim 1 or 2, wherein an ejection pressure having a magnitude of 1.0 MPa or more and 1.3 MPa or less can be pressed against the treated water at the ejection port.

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