WO2018037938A1 - Running water sterilization device and running water sterilization method - Google Patents

Running water sterilization device and running water sterilization method Download PDF

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Publication number
WO2018037938A1
WO2018037938A1 PCT/JP2017/029113 JP2017029113W WO2018037938A1 WO 2018037938 A1 WO2018037938 A1 WO 2018037938A1 JP 2017029113 W JP2017029113 W JP 2017029113W WO 2018037938 A1 WO2018037938 A1 WO 2018037938A1
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light source
straight pipe
flow path
ultraviolet light
bubbles
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PCT/JP2017/029113
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French (fr)
Japanese (ja)
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鉄美 越智
真也 渡邊
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日機装株式会社
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light

Definitions

  • the present invention relates to a running water sterilization apparatus and a running water sterilization method, and more particularly to a technique for sterilizing running water by irradiating ultraviolet light.
  • ultraviolet light has a sterilizing ability
  • an apparatus for irradiating ultraviolet light is used for sterilization treatment at medical or food processing sites.
  • an apparatus for continuously sterilizing a fluid by irradiating a fluid such as water with ultraviolet light is also used.
  • a device in which an ultraviolet LED is arranged on the inner wall of a pipe end of a flow path formed of a straight tubular metal pipe can be cited (for example, see Patent Document 1).
  • the present invention has been made in view of these problems, and one of exemplary purposes thereof is to provide a running water sterilization apparatus and a running water sterilization method with improved sterilization efficiency.
  • a flowing water sterilizer is provided on at least one of a straight pipe that divides a processing flow path and both ends of the straight pipe, and irradiates ultraviolet light in the axial direction of the straight pipe toward the processing flow path.
  • a light source, and a bubble generator that is provided upstream of the processing channel and mixes bubbles with water flowing into the processing channel.
  • the volume occupied by water in the processing channel can be reduced, and the transmittance of ultraviolet light in the processing channel can be increased. it can. Further, the ultraviolet light is scattered, reflected, and refracted by the bubbles, so that the illuminance distribution of the ultraviolet light in the processing flow path can be made uniform and the occurrence of irradiation unevenness can be suppressed. Furthermore, it is possible to prevent the adhesion of dirt to the wall surface in the processing channel by using a shock wave when bubbles are crushed.
  • the light source may be provided at least at the downstream end of the straight pipe.
  • a window member for partitioning between the light source and the processing flow path may be further provided.
  • a deaeration device may be further provided which is provided downstream from the processing channel and removes bubbles from water flowing out from the processing channel.
  • the straight pipe may have at least an inner wall surface made of polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • Another aspect of the present invention is a running water sterilization method.
  • the method includes a step of mixing bubbles with water flowing into a processing flow path partitioned by a straight pipe, and a step of irradiating ultraviolet light in the axial direction of the straight pipe toward water containing bubbles flowing through the processing flow path. .
  • the volume occupied by water in the processing channel can be reduced, and the transmittance of ultraviolet light in the processing channel can be increased. it can. Further, the ultraviolet light is scattered, reflected, and refracted by the bubbles, so that the illuminance distribution of the ultraviolet light in the processing flow path can be made uniform and the occurrence of irradiation unevenness can be suppressed. Furthermore, it is possible to prevent the adhesion of dirt to the wall surface in the processing channel by using a shock wave when bubbles are crushed.
  • the sterilization ability can be improved by increasing the irradiation efficiency of ultraviolet light.
  • FIG. 1 is a diagram schematically showing a configuration of a running water sterilizer 10 according to an embodiment.
  • the running water sterilizer 10 includes a straight pipe 20, an inflow pipe 31, an outflow pipe 32, a first light source 41, a second light source 42, a bubble generator 50, and a deaeration device 60.
  • the flowing water sterilizer 10 is used for mixing the bubbles 70 with the water flowing through the processing flow path 16 defined by the straight pipe 20 and irradiating the water mixed with the bubbles 70 with ultraviolet light to perform sterilization.
  • the straight pipe 20 includes an upstream end 21, a downstream end 22, an inflow port 23, an outflow port 24, a first window member 25, and a second window member 26.
  • the straight pipe 20 extends in the axial direction from the upstream end 21 toward the downstream end 22 and has, for example, a length of three times or more the inner diameter.
  • the upstream end 21 is provided with a first window member 25 that transmits ultraviolet light from the first light source 41, and an inflow port 23 is provided in the vicinity of the first window member 25.
  • the downstream end 22 is provided with a second window member 26 that transmits ultraviolet light from the second light source 42, and an outlet 24 is provided in the vicinity of the second window member 26.
  • First window member 25 and the second window member 26 are quartz (SiO 2), sapphire (Al 2 O 3), consisting of members which has higher transmission in the amorphous fluororesin such ultraviolet light.
  • An inflow pipe 31 extending in a direction intersecting or orthogonal to the axial direction of the straight pipe 20 is attached to the inflow port 23.
  • An outflow pipe 32 extending in a direction intersecting or perpendicular to the axial direction of the straight pipe 20 is attached to the outflow port 24.
  • a first branch pipe 33 is provided in the middle of the inflow pipe 31, and the bubble generator 50 is connected via the first branch pipe 33.
  • a second branch pipe 34 is provided in the middle of the outflow pipe 32, and a deaeration device 60 is connected through the second branch pipe 34.
  • the straight pipe 20 is made of, for example, polytetrafluoroethylene (PTFE) which is a perfluorinated resin.
  • PTFE polytetrafluoroethylene
  • PTFE is a chemically stable material and is excellent in durability, heat resistance and chemical resistance.
  • PTFE is a material having a high reflectivity of ultraviolet light. Therefore, by configuring the straight tube 20 with PTFE, the ultraviolet light emitted from the first light source 41 and the second light source 42 can be propagated in the axial direction of the straight tube 20 while being reflected by the inner wall surface 18.
  • the straight pipe 20 may not be entirely made of PTFE, and the inner wall surface 18 that defines the processing flow path 16 may be made of PTFE.
  • the straight pipe 20 may be configured by attaching a PTFE liner to the inner surface of a pipe made of another resin material or metal material.
  • the inflow pipe 31 and the outflow pipe 32 may be made of the same material as that of the straight pipe 20 or may be made of a material different from that of the straight pipe 20.
  • the first light source 41 and the second light source 42 are so-called UV-LED (Ultra Violet-Light Emitting Diode) light sources including light emitting elements that emit ultraviolet light. It is preferable that the light emitting element included in the light source emits ultraviolet light having a central wavelength or peak wavelength in the range of about 200 nm to 350 nm and having a high bactericidal efficiency in the vicinity of 260 nm to 270 nm.
  • an ultraviolet light LED for example, one using aluminum gallium nitride (AlGaN) is known.
  • the first light source 41 is disposed in the first light source chamber 11 defined between the upstream end 21 and the first window member 25.
  • the first light source 41 is arranged so as to irradiate ultraviolet light in the axial direction toward the processing channel 16 through the first window member 25.
  • the second light source 42 is disposed in the second light source chamber 12 defined between the downstream end 22 and the second window member 26.
  • the second light source 42 is disposed so as to irradiate ultraviolet light in the axial direction toward the processing channel 16 through the second window member 26.
  • the first light source 41 and the second light source 42 are mounted on a substrate whose base material is copper (Cu), aluminum (Al), or the like.
  • the first light source 41 and the second light source 42 may include an adjustment mechanism for adjusting the light distribution angle of the light emitting element.
  • the adjustment mechanism adjusts the emission angle so that the orientation angle becomes 30 degrees or less.
  • the adjustment mechanism may be constituted by a transmission type optical system such as a lens, or may be constituted by a reflection type optical system such as a concave mirror. By using such an adjustment mechanism, the incident angle of the ultraviolet light incident on the inner wall surface 18 of the processing channel 16 can be made to be 75 degrees or more.
  • the present inventors know that the reflectance on the surface becomes very high when the incident angle to the PTFE is 70 degrees or more. Therefore, by adjusting the alignment angle of the ultraviolet light by the adjusting mechanism, it is possible to propagate the ultraviolet light having a higher intensity far.
  • the bubble generating device 50 generates bubbles 70 in the water flowing into the processing channel 16 from the inlet 23 and mixes the bubbles 70 with the water flowing through the processing channel 16.
  • the size of the bubbles generated by the bubble generator 50 is not particularly limited, but is preferably a bubble size that can effectively scatter ultraviolet light. It may be a microbubble (bubble diameter: about 1 ⁇ m to 100 ⁇ m).
  • the component of the bubble 70 generated by the bubble generator 50 is not particularly limited, and may be nitrogen (N 2 ), oxygen (O 2 ), carbon dioxide (CO 2 ), or air containing these.
  • the deaeration device 60 removes the bubbles 70 contained in the water flowing out from the outlet 24 so that the water in which the bubbles 70 are reduced or removed flows out from the outflow pipe 32.
  • the flowing water sterilizer 10 mixes the bubbles 70 with the water flowing through the treatment channel 16 and irradiates the water containing the bubbles 70 with ultraviolet light. Since the transmittance of ultraviolet light is higher in air than in water, the transmittance of ultraviolet light traveling in the axial direction can be increased by increasing the volume ratio of bubbles in the processing channel and decreasing the volume ratio of water. Can be increased. In addition, the ultraviolet light is scattered, reflected, and refracted by the bubbles 70 to uniformize the illuminance distribution of the ultraviolet light in the processing flow path 16, thereby causing uneven irradiation that causes a portion where the amount of ultraviolet light irradiation is partially insufficient. Can be prevented. By suppressing the irradiation unevenness, it is possible to prevent water that has not been sufficiently sterilized from partially passing through and to enhance the sterilizing effect.
  • the present embodiment it is possible to prevent dirt from adhering to the inner wall surface 18 of the processing flow path 16 using a shock wave when the bubbles 70 are crushed, and to suppress a decrease in the irradiation intensity of ultraviolet light.
  • a window member having a relatively small opening corresponding to the water flow cross-sectional area of the straight pipe 20 is used, there is a possibility that the irradiation intensity of ultraviolet light may be greatly reduced due to local contamination of the window member.
  • the first window member 25 is located in the vicinity of the inlet 23 where the direction of water flow changes in an L shape, and many bubbles 70 are formed on the inner surface of the first window member 25 due to turbulent flow accompanying the change in water flow.
  • the dirt on the inner surface of the first window member 25 is effectively removed by the collision and collapse of the bubble 70.
  • the second window member 26 is provided at the end of the axially extending flow path, many of the bubbles 70 from the processing flow path 16 toward the outlet 24 collide with the second window member 26, and the second window member 26 The dirt on the inner surface of 26 is effectively removed.
  • a light source may be provided only in either one of the both ends of the straight tube 20.
  • only the first light source 41 may be provided, or only the second light source 42 may be provided.
  • the running water sterilizer may be configured not to include the deaerator 60. In this case, the water containing the bubbles 70 may flow out from the outflow pipe 32 to the outside.
  • the device has been described as a device for sterilizing water by irradiating it with ultraviolet light.
  • this apparatus may be used for a purification treatment for decomposing organic substances contained in water by irradiation with ultraviolet light.
  • DESCRIPTION OF SYMBOLS 10 ... Running water sterilizer, 16 ... Processing flow path, 18 ... Inner wall surface, 20 ... Straight pipe, 21 ... Upstream side end, 22 ... Downstream side end, 23 ... Inlet, 24 ... Outlet, 25 ... 1st Window member, 26 ... second window member, 41 ... first light source, 42 ... second light source, 50 ... bubble generator, 60 ... deaerator, 70 ... air bubbles.
  • the sterilization ability can be improved by increasing the irradiation efficiency of ultraviolet light.

Abstract

The present invention comprises: a straight pipe 20 that partitions a treatment flow path 16; a light source (a first light source 41 or a second light source 42) that is provided in at least one of two end sections (an upstream-side end section 21 and a downstream-side end section 22) of the straight pipe 20 and irradiates ultraviolet light towards the treatment flow path 16, in the axial direction of the straight pipe 20; and a bubble generation device 50 that is provided further upstream than the treatment flow path 16 and mixes bubbles 70 into water that flows into the treatment flow path 16. A window member (a first window member 25 or a second window member 26) may also be provided that partitions between the light source and the treatment flow path.

Description

流水殺菌装置および流水殺菌方法Running water sterilizer and running water sterilization method
　本発明は、流水殺菌装置および流水殺菌方法に関し、特に、紫外光を照射して流水を殺菌する技術に関する。 The present invention relates to a running water sterilization apparatus and a running water sterilization method, and more particularly to a technique for sterilizing running water by irradiating ultraviolet light.
　紫外光には殺菌能力があることが知られており、医療や食品加工の現場などでの殺菌処理に紫外光を照射する装置が用いられている。また、水などの流体に紫外光を照射することで、流体を連続的に殺菌する装置も用いられている。このような装置として、例えば、直管状の金属パイプで形成される流路の管端部内壁に紫外線ＬＥＤを配置した装置が挙げられる（例えば、特許文献１参照）。 It is known that ultraviolet light has a sterilizing ability, and an apparatus for irradiating ultraviolet light is used for sterilization treatment at medical or food processing sites. In addition, an apparatus for continuously sterilizing a fluid by irradiating a fluid such as water with ultraviolet light is also used. As such a device, for example, a device in which an ultraviolet LED is arranged on the inner wall of a pipe end of a flow path formed of a straight tubular metal pipe can be cited (for example, see Patent Document 1).
特開２０１１－１６０７４号公報JP 2011-16074 A
　直管状の流路内の流水に対して高効率で紫外光を照射できることが望ましい。 It is desirable to be able to irradiate ultraviolet light with high efficiency to the flowing water in the straight tubular channel.
　本発明はこうした課題に鑑みてなされたものであり、その例示的な目的のひとつは、殺菌効率を高めた流水殺菌装置および流水殺菌方法を提供することにある。 The present invention has been made in view of these problems, and one of exemplary purposes thereof is to provide a running water sterilization apparatus and a running water sterilization method with improved sterilization efficiency.
　本発明のある態様の流水殺菌装置は、処理流路を区画する直管と、直管の両端部の少なくとも一方に設けられ、処理流路に向けて直管の軸方向に紫外光を照射する光源と、処理流路より上流に設けられ、処理流路に流入する水に気泡を混合させるバブル発生装置と、を備える。 A flowing water sterilizer according to an aspect of the present invention is provided on at least one of a straight pipe that divides a processing flow path and both ends of the straight pipe, and irradiates ultraviolet light in the axial direction of the straight pipe toward the processing flow path. A light source, and a bubble generator that is provided upstream of the processing channel and mixes bubbles with water flowing into the processing channel.
　この態様によると、直管状の処理流路を流れる水に気泡を混合させることにより、処理流路内で水が占める体積を減少させ、処理流路内での紫外光の透過率を高めることができる。また、気泡によって紫外光を散乱、反射および屈折させることで処理流路内の紫外光の照度分布を均一化し、照射ムラの発生を抑えることができる。さらに、気泡が圧壊する際の衝撃波を利用して処理流路内の壁面への汚れ付着を防止できる。 According to this aspect, by mixing bubbles in the water flowing through the straight tubular processing channel, the volume occupied by water in the processing channel can be reduced, and the transmittance of ultraviolet light in the processing channel can be increased. it can. Further, the ultraviolet light is scattered, reflected, and refracted by the bubbles, so that the illuminance distribution of the ultraviolet light in the processing flow path can be made uniform and the occurrence of irradiation unevenness can be suppressed. Furthermore, it is possible to prevent the adhesion of dirt to the wall surface in the processing channel by using a shock wave when bubbles are crushed.
　光源は、少なくとも直管の下流側端部に設けられてもよい。 The light source may be provided at least at the downstream end of the straight pipe.
　光源と処理流路の間を区画する窓部材をさらに備えてもよい。 A window member for partitioning between the light source and the processing flow path may be further provided.
　処理流路より下流に設けられ、処理流路から流出する水から気泡を除去する脱気装置をさらに備えてもよい。 A deaeration device may be further provided which is provided downstream from the processing channel and removes bubbles from water flowing out from the processing channel.
　直管は、少なくとも内壁面がポリテトラフルオロエチレン（ＰＴＦＥ）で構成されてもよい。 The straight pipe may have at least an inner wall surface made of polytetrafluoroethylene (PTFE).
　本発明の別の態様は、流水殺菌方法である。この方法は、直管で区画される処理流路に流入する水に気泡を混合させるステップと、処理流路を流れる気泡を含む水に向けて直管の軸方向に紫外光を照射するステップと、を備える。 Another aspect of the present invention is a running water sterilization method. The method includes a step of mixing bubbles with water flowing into a processing flow path partitioned by a straight pipe, and a step of irradiating ultraviolet light in the axial direction of the straight pipe toward water containing bubbles flowing through the processing flow path. .
　この態様によると、直管状の処理流路を流れる水に気泡を混合させることにより、処理流路内で水が占める体積を減少させ、処理流路内での紫外光の透過率を高めることができる。また、気泡によって紫外光を散乱、反射および屈折させることで処理流路内の紫外光の照度分布を均一化し、照射ムラの発生を抑えることができる。さらに、気泡が圧壊する際の衝撃波を利用して処理流路内の壁面への汚れ付着を防止できる。 According to this aspect, by mixing bubbles in the water flowing through the straight tubular processing channel, the volume occupied by water in the processing channel can be reduced, and the transmittance of ultraviolet light in the processing channel can be increased. it can. Further, the ultraviolet light is scattered, reflected, and refracted by the bubbles, so that the illuminance distribution of the ultraviolet light in the processing flow path can be made uniform and the occurrence of irradiation unevenness can be suppressed. Furthermore, it is possible to prevent the adhesion of dirt to the wall surface in the processing channel by using a shock wave when bubbles are crushed.
　本発明によれば、紫外光の照射効率を高めて殺菌能力を向上させることができる。 According to the present invention, the sterilization ability can be improved by increasing the irradiation efficiency of ultraviolet light.
実施の形態に係る流水殺菌装置の構成を概略的に示す断面図である。It is sectional drawing which shows schematically the structure of the running water sterilizer which concerns on embodiment.
　以下、図面を参照しながら、本発明を実施するための形態について詳細に説明する。なお、説明において同一の要素には同一の符号を付し、重複する説明を適宜省略する。 Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the description, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate.
　図１は、実施の形態に係る流水殺菌装置１０の構成を概略的に示す図である。流水殺菌装置１０は、直管２０と、流入管３１と、流出管３２と、第１光源４１と、第２光源４２と、バブル発生装置５０と、脱気装置６０とを備える。流水殺菌装置１０は、直管２０で区画される処理流路１６を流れる水に気泡７０を混合させ、気泡７０が混合した水に紫外光を照射して殺菌処理を施すために用いられる。 FIG. 1 is a diagram schematically showing a configuration of a running water sterilizer 10 according to an embodiment. The running water sterilizer 10 includes a straight pipe 20, an inflow pipe 31, an outflow pipe 32, a first light source 41, a second light source 42, a bubble generator 50, and a deaeration device 60. The flowing water sterilizer 10 is used for mixing the bubbles 70 with the water flowing through the processing flow path 16 defined by the straight pipe 20 and irradiating the water mixed with the bubbles 70 with ultraviolet light to perform sterilization.
　直管２０は、上流側端部２１と、下流側端部２２と、流入口２３と、流出口２４と、第１窓部材２５と、第２窓部材２６とを有する。直管２０は、上流側端部２１から下流側端部２２に向けて軸方向に延びており、例えば内直径の３倍以上の長さを有する。上流側端部２１には、第１光源４１からの紫外光を透過させる第１窓部材２５が設けられ、第１窓部材２５の近傍に流入口２３が設けられる。下流側端部２２には、第２光源４２からの紫外光を透過させる第２窓部材２６が設けられ、第２窓部材２６の近傍に流出口２４が設けられる。第１窓部材２５および第２窓部材２６は、石英（ＳｉＯ２）やサファイア（Ａｌ２Ｏ３）、非晶質のフッ素系樹脂といった紫外光の透過率が高い部材で構成される。 The straight pipe 20 includes an upstream end 21, a downstream end 22, an inflow port 23, an outflow port 24, a first window member 25, and a second window member 26. The straight pipe 20 extends in the axial direction from the upstream end 21 toward the downstream end 22 and has, for example, a length of three times or more the inner diameter. The upstream end 21 is provided with a first window member 25 that transmits ultraviolet light from the first light source 41, and an inflow port 23 is provided in the vicinity of the first window member 25. The downstream end 22 is provided with a second window member 26 that transmits ultraviolet light from the second light source 42, and an outlet 24 is provided in the vicinity of the second window member 26. First window member 25 and the second window member 26 are quartz (SiO 2), sapphire (Al 2 O 3), consisting of members which has higher transmission in the amorphous fluororesin such ultraviolet light.
　流入口２３には、直管２０の軸方向と交差または直交する方向に延びる流入管３１が取り付けられている。流出口２４には、直管２０の軸方向と交差または直交する方向に延びる流出管３２が取り付けられている。流入管３１の途中には第１分岐管３３が設けられ、第１分岐管３３を介してバブル発生装置５０が接続される。流出管３２の途中には第２分岐管３４が設けられ、第２分岐管３４を介して脱気装置６０が接続される。 An inflow pipe 31 extending in a direction intersecting or orthogonal to the axial direction of the straight pipe 20 is attached to the inflow port 23. An outflow pipe 32 extending in a direction intersecting or perpendicular to the axial direction of the straight pipe 20 is attached to the outflow port 24. A first branch pipe 33 is provided in the middle of the inflow pipe 31, and the bubble generator 50 is connected via the first branch pipe 33. A second branch pipe 34 is provided in the middle of the outflow pipe 32, and a deaeration device 60 is connected through the second branch pipe 34.
　直管２０は、例えば、全フッ素化樹脂であるポリテトラフルオロエチレン（ＰＴＦＥ）で構成される。ＰＴＦＥは、化学的に安定した材料であり、耐久性、耐熱性および耐薬品性に優れた材料である。また、ＰＴＦＥは、紫外光の反射率が高い材料である。そのため、直管２０をＰＴＦＥで構成することにより、第１光源４１および第２光源４２が発する紫外光を内壁面１８で反射させながら直管２０の軸方向に伝搬させることができる。 The straight pipe 20 is made of, for example, polytetrafluoroethylene (PTFE) which is a perfluorinated resin. PTFE is a chemically stable material and is excellent in durability, heat resistance and chemical resistance. PTFE is a material having a high reflectivity of ultraviolet light. Therefore, by configuring the straight tube 20 with PTFE, the ultraviolet light emitted from the first light source 41 and the second light source 42 can be propagated in the axial direction of the straight tube 20 while being reflected by the inner wall surface 18.
　直管２０は、その全体がＰＴＦＥで構成されなくてもよく、処理流路１６を区画する内壁面１８がＰＴＦＥで構成されてもよい。例えば、他の樹脂材料もしくは金属材料で構成される管の内面にＰＴＦＥのライナを取り付けて直管２０を構成してもよい。流入管３１および流出管３２は、直管２０と同様の材料で構成されてもよいし、直管２０と異なる材料で構成されてもよい。 The straight pipe 20 may not be entirely made of PTFE, and the inner wall surface 18 that defines the processing flow path 16 may be made of PTFE. For example, the straight pipe 20 may be configured by attaching a PTFE liner to the inner surface of a pipe made of another resin material or metal material. The inflow pipe 31 and the outflow pipe 32 may be made of the same material as that of the straight pipe 20 or may be made of a material different from that of the straight pipe 20.
　第１光源４１および第２光源４２は、紫外光を発する発光素子を含むいわゆるＵＶ－ＬＥＤ（Ultra Violet-Light Emitting Diode）光源である。光源に含まれる発光素子は、その中心波長またはピーク波長が約２００ｎｍ～３５０ｎｍの範囲に含まれ、殺菌効率の高い波長である２６０ｎｍ～２７０ｎｍ付近の紫外光を発することが好ましい。このような紫外光ＬＥＤとして、例えば、窒化アルミニウムガリウム（ＡｌＧａＮ）を用いたものが知られている。 The first light source 41 and the second light source 42 are so-called UV-LED (Ultra Violet-Light Emitting Diode) light sources including light emitting elements that emit ultraviolet light. It is preferable that the light emitting element included in the light source emits ultraviolet light having a central wavelength or peak wavelength in the range of about 200 nm to 350 nm and having a high bactericidal efficiency in the vicinity of 260 nm to 270 nm. As such an ultraviolet light LED, for example, one using aluminum gallium nitride (AlGaN) is known.
　第１光源４１は、上流側端部２１と第１窓部材２５の間に区画される第１光源室１１に配置される。第１光源４１は、第１窓部材２５を介して処理流路１６に向けて軸方向に紫外光を照射するよう配置される。第２光源４２は、下流側端部２２と第２窓部材２６の間に区画される第２光源室１２に配置される。第２光源４２は、第２窓部材２６を介して処理流路１６に向けて軸方向に紫外光を照射するよう配置される。第１光源４１および第２光源４２は、例えば、ベース材料が銅（Ｃｕ）やアルミニウム（Ａｌ）などの基板に実装される。 The first light source 41 is disposed in the first light source chamber 11 defined between the upstream end 21 and the first window member 25. The first light source 41 is arranged so as to irradiate ultraviolet light in the axial direction toward the processing channel 16 through the first window member 25. The second light source 42 is disposed in the second light source chamber 12 defined between the downstream end 22 and the second window member 26. The second light source 42 is disposed so as to irradiate ultraviolet light in the axial direction toward the processing channel 16 through the second window member 26. For example, the first light source 41 and the second light source 42 are mounted on a substrate whose base material is copper (Cu), aluminum (Al), or the like.
　第１光源４１および第２光源４２は、発光素子の配光角を調整するための調整機構を含んでもよい。調整機構は、例えば、光源が含む発光素子の指向角または配向角が６０度以上、９０度以上または１２０度以上である場合に、その出射角を調整して配向角が３０度以下となるようにする。調整機構は、レンズなどの透過型の光学系で構成されてもよいし、凹面鏡などの反射型の光学系で構成されてもい。このような調整機構を用いることにより、処理流路１６の内壁面１８に入射する紫外光の入射角が７５度以上となるようにできる。特に内壁面１８がＰＴＦＥで構成される場合、ＰＴＦＥへの入射角が７０度以上となると表面での反射率が非常に高くなることが本発明者らの知見により分かっている。そのため、調整機構により紫外光の配向角を調整することで、より高強度の紫外光を遠くまで伝搬させることができる。 The first light source 41 and the second light source 42 may include an adjustment mechanism for adjusting the light distribution angle of the light emitting element. For example, when the directivity angle or orientation angle of the light emitting element included in the light source is 60 degrees or more, 90 degrees or more, or 120 degrees or more, the adjustment mechanism adjusts the emission angle so that the orientation angle becomes 30 degrees or less. To. The adjustment mechanism may be constituted by a transmission type optical system such as a lens, or may be constituted by a reflection type optical system such as a concave mirror. By using such an adjustment mechanism, the incident angle of the ultraviolet light incident on the inner wall surface 18 of the processing channel 16 can be made to be 75 degrees or more. In particular, when the inner wall surface 18 is made of PTFE, the present inventors know that the reflectance on the surface becomes very high when the incident angle to the PTFE is 70 degrees or more. Therefore, by adjusting the alignment angle of the ultraviolet light by the adjusting mechanism, it is possible to propagate the ultraviolet light having a higher intensity far.
　バブル発生装置５０は、流入口２３から処理流路１６に流入する水中に気泡７０を発生させ、処理流路１６を流れる水に気泡７０を混合させる。バブル発生装置５０が発生させる気泡のサイズは特に問わないが、紫外光を効果的に散乱させることができる気泡サイズであることが好ましく、いわゆるミリバブル（泡径：０．１ｍｍ～数ｍｍ程度）やマイクロバブル（泡径：１μｍ～１００μｍ程度）であってよい。バブル発生装置５０が発生させる気泡７０の成分は特に問わず、窒素（Ｎ２）、酸素（Ｏ２）、二酸化炭素（ＣＯ２）またはこれらを含む空気であってもよい。脱気装置６０は、流出口２４から流出する水中に含まれる気泡７０を除去し、気泡７０を低減または除去させた水が流出管３２から流出されるようにする。 The bubble generating device 50 generates bubbles 70 in the water flowing into the processing channel 16 from the inlet 23 and mixes the bubbles 70 with the water flowing through the processing channel 16. The size of the bubbles generated by the bubble generator 50 is not particularly limited, but is preferably a bubble size that can effectively scatter ultraviolet light. It may be a microbubble (bubble diameter: about 1 μm to 100 μm). The component of the bubble 70 generated by the bubble generator 50 is not particularly limited, and may be nitrogen (N 2 ), oxygen (O 2 ), carbon dioxide (CO 2 ), or air containing these. The deaeration device 60 removes the bubbles 70 contained in the water flowing out from the outlet 24 so that the water in which the bubbles 70 are reduced or removed flows out from the outflow pipe 32.
　以上の構成によれば、流水殺菌装置１０は、処理流路１６を流れる水に気泡７０を混合させ、気泡７０が含まれる水に対して紫外光を照射する。紫外光の透過率は水中より空気中の方が高いため、処理流路内の気泡の体積の割合を増大させて水の体積の割合を減少させることにより、軸方向に進む紫外光の透過率を高めることができる。また、気泡７０により紫外光を散乱、反射および屈折させることで処理流路１６内の紫外光の照度分布を均一化し、紫外光の照射量が部分的に不足する箇所が生じる照射ムラの発生を防ぐことができる。照射ムラを抑制することにより、十分に殺菌されていない水が部分的に通過してしまうことを防ぎ、殺菌効果を高めることができる。 According to the above configuration, the flowing water sterilizer 10 mixes the bubbles 70 with the water flowing through the treatment channel 16 and irradiates the water containing the bubbles 70 with ultraviolet light. Since the transmittance of ultraviolet light is higher in air than in water, the transmittance of ultraviolet light traveling in the axial direction can be increased by increasing the volume ratio of bubbles in the processing channel and decreasing the volume ratio of water. Can be increased. In addition, the ultraviolet light is scattered, reflected, and refracted by the bubbles 70 to uniformize the illuminance distribution of the ultraviolet light in the processing flow path 16, thereby causing uneven irradiation that causes a portion where the amount of ultraviolet light irradiation is partially insufficient. Can be prevented. By suppressing the irradiation unevenness, it is possible to prevent water that has not been sufficiently sterilized from partially passing through and to enhance the sterilizing effect.
　本実施の形態によれば、気泡７０が圧壊する際の衝撃波を利用して処理流路１６の内壁面１８への汚れ付着を防止し、紫外光の照射強度の低下を抑えることができる。本実施の形態では、直管２０の通水断面積に対応する比較的小さな開口の窓部材を用いているため、窓部材の局所的な汚れにより紫外光の照射強度が大きく低下するおそれがある。しかしながら、第１窓部材２５は水の流れの方向がＬ字状に変化する流入口２３の近傍に位置し、水の流れ変化に伴う乱流により第１窓部材２５の内面に気泡７０の多くが衝突することから、気泡７０の衝突および圧壊により第１窓部材２５の内面の汚れが効果的に除去される。同様に、第２窓部材２６は軸方向に延びる流路の末端に設けられるため、処理流路１６から流出口２４に向かう気泡７０の多くが第２窓部材２６に衝突し、第２窓部材２６の内面の汚れが効果的に除去される。このように、本実施の形態によれば、紫外光が透過する窓部材の汚れを効果的に除去することができ、窓部材の汚れに伴う紫外光照射強度の低下を抑えることができる。 According to the present embodiment, it is possible to prevent dirt from adhering to the inner wall surface 18 of the processing flow path 16 using a shock wave when the bubbles 70 are crushed, and to suppress a decrease in the irradiation intensity of ultraviolet light. In the present embodiment, since a window member having a relatively small opening corresponding to the water flow cross-sectional area of the straight pipe 20 is used, there is a possibility that the irradiation intensity of ultraviolet light may be greatly reduced due to local contamination of the window member. . However, the first window member 25 is located in the vicinity of the inlet 23 where the direction of water flow changes in an L shape, and many bubbles 70 are formed on the inner surface of the first window member 25 due to turbulent flow accompanying the change in water flow. Therefore, the dirt on the inner surface of the first window member 25 is effectively removed by the collision and collapse of the bubble 70. Similarly, since the second window member 26 is provided at the end of the axially extending flow path, many of the bubbles 70 from the processing flow path 16 toward the outlet 24 collide with the second window member 26, and the second window member 26 The dirt on the inner surface of 26 is effectively removed. As described above, according to the present embodiment, it is possible to effectively remove the dirt on the window member through which the ultraviolet light is transmitted, and it is possible to suppress a decrease in the ultraviolet light irradiation intensity due to the dirt on the window member.
　以上、本発明を実施例にもとづいて説明した。本発明は上記実施の形態に限定されず、種々の設計変更が可能であり、様々な変形例が可能であること、またそうした変形例も本発明の範囲にあることは、当業者に理解されるところである。 The present invention has been described above based on the embodiments. It is understood by those skilled in the art that the present invention is not limited to the above-described embodiment, and various design changes are possible, and various modifications are possible, and such modifications are within the scope of the present invention. It is a place.
　上述の実施の形態では、直管２０の両端部にそれぞれ第１光源４１と第２光源４２を設ける場合を示した。変形例においては、直管２０の両端部のいずれか一方にのみ光源が設けられもよい。例えば、第１光源４１のみを設けてもよいし、第２光源４２のみを設けてもよい。いずれか一方に光源を設ける場合、第２光源４２のみを設けることが好ましいかもしれない。第１窓部材２５の位置と比べて第２窓部材２６の方が気泡７０による汚れ除去効果が高いためである。また流水殺菌装置は、脱気装置６０を備えない構成としてもよい。この場合、気泡７０が含まれた水が流出管３２から外部に流出してもよい。 In the above-described embodiment, the case where the first light source 41 and the second light source 42 are provided at both ends of the straight tube 20 has been described. In a modification, a light source may be provided only in either one of the both ends of the straight tube 20. For example, only the first light source 41 may be provided, or only the second light source 42 may be provided. When a light source is provided on either one, it may be preferable to provide only the second light source 42. This is because the second window member 26 has a higher dirt removal effect by the bubbles 70 than the position of the first window member 25. The running water sterilizer may be configured not to include the deaerator 60. In this case, the water containing the bubbles 70 may flow out from the outflow pipe 32 to the outside.
　上述の実施の形態では、水に紫外光を照射して殺菌処理を施すための装置として説明した。変形例においては、紫外光の照射により水に含まれる有機物を分解させる浄化処理に本装置を用いてもよい。 In the above-described embodiment, the device has been described as a device for sterilizing water by irradiating it with ultraviolet light. In a modified example, this apparatus may be used for a purification treatment for decomposing organic substances contained in water by irradiation with ultraviolet light.
　１０…流水殺菌装置、１６…処理流路、１８…内壁面、２０…直管、２１…上流側端部、２２…下流側端部、２３…流入口、２４…流出口、２５…第１窓部材、２６…第２窓部材、４１…第１光源、４２…第２光源、５０…バブル発生装置、６０…脱気装置、７０…気泡。 DESCRIPTION OF SYMBOLS 10 ... Running water sterilizer, 16 ... Processing flow path, 18 ... Inner wall surface, 20 ... Straight pipe, 21 ... Upstream side end, 22 ... Downstream side end, 23 ... Inlet, 24 ... Outlet, 25 ... 1st Window member, 26 ... second window member, 41 ... first light source, 42 ... second light source, 50 ... bubble generator, 60 ... deaerator, 70 ... air bubbles.
　本発明によれば、紫外光の照射効率を高めて殺菌能力を向上させることができる。 According to the present invention, the sterilization ability can be improved by increasing the irradiation efficiency of ultraviolet light.

Claims (6)

  1. 　処理流路を区画する直管と、
    　前記直管の両端部の少なくとも一方に設けられ、前記処理流路に向けて前記直管の軸方向に紫外光を照射する光源と、
    　前記処理流路より上流に設けられ、前記処理流路に流入する水に気泡を混合させるバブル発生装置と、を備えることを特徴とする流水殺菌装置。     A straight pipe that divides the processing flow path;
    A light source that is provided at at least one of both ends of the straight pipe and irradiates ultraviolet light in the axial direction of the straight pipe toward the processing flow path;
    A flowing water sterilizer, comprising a bubble generator provided upstream of the processing channel and mixing bubbles with water flowing into the processing channel.
  2. 　前記光源は、少なくとも前記直管の下流側端部に設けられることを特徴とする請求項１に記載の流水殺菌装置。 The running water sterilizer according to claim 1, wherein the light source is provided at least at a downstream end of the straight pipe.
  3. 　前記光源と前記処理流路の間を区画する窓部材をさらに備えることを特徴とする請求項１または２に記載の流水殺菌装置。 The running water sterilizer according to claim 1 or 2, further comprising a window member that partitions between the light source and the processing flow path.
  4. 　前記処理流路より下流に設けられ、前記処理流路から流出する水から気泡を除去する脱気装置をさらに備えることを特徴とする請求項１から３のいずれか一項に記載の流水殺菌装置。 The running water sterilizer according to any one of claims 1 to 3, further comprising a deaeration device that is provided downstream of the processing channel and removes bubbles from water flowing out of the processing channel. .
  5. 　前記直管は、少なくとも内壁面がポリテトラフルオロエチレン（ＰＴＦＥ）で構成されることを特徴する請求項１から４のいずれか一項に記載の流水殺菌装置。 The flowing water sterilizer according to any one of claims 1 to 4, wherein at least the inner wall surface of the straight pipe is made of polytetrafluoroethylene (PTFE).
  6. 　直管で区画される処理流路に流入する水に気泡を混合させるステップと、
    　前記処理流路を流れる気泡を含む水に向けて前記直管の軸方向に紫外光を照射するステップと、を備えることを特徴とする流水殺菌方法。     Mixing air bubbles with water flowing into a processing channel defined by a straight pipe;
    Irradiating ultraviolet light in the axial direction of the straight pipe toward the water containing bubbles flowing through the treatment flow path.
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