JP2016010789A - Uv lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deactivate or sterilize microorganisms reliably by irradiating a fluid with UV rays.SOLUTION: In a UV lamp 1, annular units 6 are provided outside a tube body 3 composed of a transmission tube, e.g. a quartz tube, and a reflection surface 4 is arranged on the outer surface of the tube body 3. In the individual annular units 6, UV light emitting diodes 7 are arranged at intervals in the circumferential direction. The UV light L radiated from the UV light-emitting diodes 7 is inclined to the water flowing direction so as to be reflected on the reflection surface 4. The UV light passes through the water flow, is reflected on the reflection surface 4, progresses again toward the water flow and is directed to the water flow.

Description

  The present invention relates to an ultraviolet irradiation device used for fluid treatment such as water treatment. For example, in water purification treatment or sewage treatment, the ultraviolet ray is irradiated with ultraviolet rays to inactivate microorganisms in the fluid or perform treatment such as sterilization. The present invention relates to an irradiation apparatus.

Conventionally, water in waterworks has been sterilized and sterilized in water by chlorine disinfection according to Japanese water law. However, since Cryptosporidium and Giardia (hereinafter referred to as Cryptosporidium, etc.), which are chlorine-resistant pathogenic organisms, cannot be sterilized by chlorine, the safety of clean water is enhanced by inactivation by irradiation with ultraviolet rays.
As such a water treatment facility, for example, those described in Patent Documents 1 and 2 are known.

In a water treatment facility equipped with an ultraviolet lamp described in Patent Document 1, sterilization of microorganisms in water and oxidation treatment of organic substances are performed by ultraviolet rays irradiated from an ultraviolet lamp in a conduit through which water flows. In consideration of damage to the ultraviolet lamp, a protective tube that covers the entire ultraviolet lamp is provided.
In addition, when the UV lamp and the protective tube are damaged due to an earthquake, etc., the upstream and downstream sides of the UV lamp are shut off, and the drain valve is opened to temporarily receive mercury from the UV lamp or a broken piece of the protective tube. It is received in the tank and then introduced into a heavy metal adsorption tower to recover glass fragments and adsorb mercury.

Moreover, in piping provided with the ultraviolet light-emitting diode described in Patent Document 2, the ultraviolet (UV) light-emitting diode (LED) protrudes inside the pipe through which water flows, and the electrical connection portion is positioned outside the pipe. It is designed to inactivate microorganisms in the water and remove organic substances by light emitted from the ultraviolet light emitting diodes protruding in the direction perpendicular to the direction of water flow in the tube.
FIG. 9 shows a water treatment device in which an ultraviolet light-emitting diode related to Patent Document 2 is mounted on a tube body, and an ultraviolet light-emitting diode 101 is provided on the outer periphery of the tube body 100 through which water for clean water flows. The processing means 103 arranged in the circumferential direction is attached. At the time of sterilization treatment, treatment is performed such as inactivating microorganisms in the water flow by irradiating the ultraviolet light from the ultraviolet light emitting diode 101 in a direction orthogonal to the water flow in the tube body 100.

In addition, according to the water supply facility design guidelines issued by the Japan Water Works Association 2012, in order to disinfect microorganisms in a fluid, such as sterilization, ultraviolet light (wavelength) is used for 95% or more of the amount of water passing through the ultraviolet irradiation tank. The irradiation dose at around 253.7 nm must always be 10 mJ / cm ² or more.

JP 2004-188274 A JP 2009-532200 A

  However, in the water treatment facility described in Patent Document 1 described above, since an ultraviolet lamp is installed in the water, there is an advantage that ultraviolet rays can be irradiated in all directions, but when the lamp or the protective tube is damaged, Since mercury and glass fragments are scattered in the water, a shut-off valve and bypass pipes are installed to prevent mercury and fragments from entering the water sent to downstream water purification facilities. In order to collect debris, drainage tanks and heavy metal adsorption towers had to be installed. For this reason, the configuration of the water treatment apparatus is complicated, and it is not preferable in view of the safety of clean water.

  Moreover, in the water treatment apparatus described in Patent Document 2, when the water flow flowing through the pipe body increases, the irradiation amount is simply obtained by irradiating the ultraviolet light perpendicular to the water flow from the ultraviolet light emitting diode disposed in the pipe body. There was a fault that it was not able to satisfy and a sufficient bactericidal effect was not able to be exhibited.

  This invention is made in view of such a situation, Comprising: It aims at providing the ultraviolet irradiation device which inactivates microorganisms reliably by irradiating the fluid which flows through a tubular body with ultraviolet rays, and disinfects. .

An ultraviolet irradiation device according to the present invention is an ultraviolet irradiation device that irradiates a fluid such as water with ultraviolet rays, and reflects the ultraviolet rays inside the tube and a transmission surface through which ultraviolet rays pass from the outside of the tube through which the fluid flows. A reflection surface, and an ultraviolet light emitting diode that is provided outside the tube and irradiates the fluid flowing inside through the transmission surface of the tube with ultraviolet light. The ultraviolet light emitted from the ultraviolet light emitting diode is in the fluid flow direction. On the other hand, it irradiates in the direction which inclines, and it reflects on a reflective surface.
According to the present invention, ultraviolet light is irradiated into the fluid from the ultraviolet light-emitting diode provided outside the tube through which the fluid flows, through the transmission surface of the tube, and further reflected by the reflection surface of the tube, and again into the fluid. It is possible to reliably inactivate and sterilize microorganisms in the fluid by irradiating and repeating the irradiation of ultraviolet rays to the fluid and the reflection on the reflecting surface.
Furthermore, since the ultraviolet rays are irradiated in a direction inclined with respect to the flow direction of the fluid, the irradiation time equivalent to the case of irradiating the stopped fluid with the ultraviolet rays, that is, the irradiation amount, is applied to the fluid flowing in the pipe body. It can be secured.

Moreover, it is preferable that a plurality of ultraviolet light-emitting diodes are arranged in the circumferential direction of the tubular body.
By arranging a plurality of ultraviolet light emitting diodes in the circumferential direction of the tube, the entire region of the fluid flowing in the tube is efficiently irradiated with ultraviolet light, reflected on the reflecting surface, and then irradiated again with ultraviolet light. Can be inactivated and sterilized.

Moreover, it is preferable that a plurality of sets of annular units in which the ultraviolet light emitting diodes are arranged in the circumferential direction of the tubular body are arranged at intervals in the longitudinal direction of the tubular body.
In order to inactivate and sterilize microorganisms by irradiating UV light into the fluid from the UV light emitting diode of one annular unit, the UV intensity needs to be higher than a predetermined value, and UV light is reflected on the reflective surface. By repeating the reflection of the light, the fluid can be irradiated multiple times, and a separate annular unit is placed in the region where the UV intensity decreases, and the UV light emitting diode emits new UV light to inactivate microorganisms in the fluid. Since the UV region to be sterilized and sterilized can be set continuously long, it is possible to ensure the necessary irradiation time, that is, the irradiation amount even with a large amount of fluid, and reliably inactivate and sterilize microorganisms Can be done.

Further, the transmission surface is preferably a transmission tube through which the tube body transmits ultraviolet light, and is formed on the transmission tube, and a reflection surface is provided on a part of the outer surface or the inner surface of the transmission tube.
Thereby, a permeation | transmission surface can be easily formed with the permeation | transmission pipe | tube which is a tubular body.

Further, the reflection surface may be constituted by a reflection tube whose inner surface of the tube body reflects ultraviolet rays, and a window body that opens a part of the reflection tube and transmits ultraviolet rays from the outside may be provided as the transmission surface.
Thereby, a reflective surface can be easily formed in the inner surface of a tubular body.

In addition, a reflecting member may be disposed inside the tube, and the ultraviolet light emitted from the ultraviolet light emitting diode may be reflected by the reflecting member.
If the inner diameter of the tube is large and ultraviolet irradiation light or reflected light does not reach the other end of the tube, install a reflecting member in the tube and reduce the optical path length until reflection is ensured. Irradiation light and reflected light can be irradiated to the microorganism inside.
Furthermore, the reflecting member is preferably configured to divide the flow path cross section of the tubular body into a plurality of equal parts.
In this case, since the flow path of the tubular body is evenly divided, it is possible to equalize the amount of ultraviolet irradiation with respect to the fluid in the tubular body.

In addition, a second annular unit having a reflecting surface arranged in front and rear of the first annular unit fixedly arranged on the outer surface of the tubular body is movably arranged, and the first and second annular units are arranged. A reflection surface may be formed by setting a reflection surface between the second ring unit and the upstream side or the downstream side of the second annular unit.
By moving the movable second annular unit together with the reflecting surface with respect to the fixed first annular unit, the irradiation light or the reflected light of a predetermined intensity according to the amount of the fluid in the tube body causes the microorganisms in the fluid to flow. The reflection area that can be irradiated can be set in a wide range.

According to the ultraviolet irradiation device of the present invention, the ultraviolet light emitting diode is provided outside the tube, and the ultraviolet light emitted from the ultraviolet light emitting diode is irradiated through the tube in a direction inclined with respect to the flow direction of fluid such as water. Since it is possible to repeatedly irradiate the fluid with ultraviolet rays by reflecting on the reflecting surface provided on the outer or inner surface of the body, the microorganisms in the fluid can be efficiently inactivated and sterilized by the ultraviolet rays, and the amount of treatment can be reduced. Can increase.
Moreover, since the irradiation time of ultraviolet rays with respect to the fluid becomes long, it is not necessary to arrange ultraviolet light emitting diodes in a wide range in the fluid flow direction, and the ultraviolet irradiation device can be manufactured at low cost.

It is principal part sectional drawing which shows the ultraviolet irradiation device which arranged the annular unit of the ultraviolet light emitting diode on the outer side of the pipe body which flows the clean water in 1st embodiment of this invention. It is sectional drawing which shows the installation angle with respect to the tubular body of the ultraviolet light emitting diode shown in FIG. 1, and the course of an ultraviolet-ray. It is principal part sectional drawing which shows the ultraviolet irradiation device by the 1st modification of 1st embodiment. It is explanatory drawing which shows the ultraviolet irradiation device by the 2nd modification of 1st embodiment. It is principal part sectional drawing which shows the structure which has arrange | positioned the reflection member in the inside of a tubular body in the ultraviolet irradiation device by 2nd embodiment. It is principal part sectional drawing orthogonal to the longitudinal direction which shows the structure which provided the reflection member in the tubular body in the ultraviolet irradiation device by 2nd embodiment shown in FIG. It is principal part sectional drawing orthogonal to the longitudinal direction which shows the reflection member provided in the tubular body by the modification of 2nd embodiment. It is principal part sectional drawing which shows the structure which arranged the annular unit and the reflection member in the outer side of the tubular body in the ultraviolet irradiation device by 3rd embodiment. It is a figure which shows the ultraviolet irradiation apparatus provided in the conventional tubular body, (a) is a side view of a tubular body, (b) is sectional drawing orthogonal to the longitudinal direction of a tubular body.

Hereinafter, an ultraviolet irradiation device for a waterway according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG.1 and FIG.2 shows the ultraviolet irradiation device 1 by 1st embodiment of this invention. An ultraviolet irradiation device 1 shown in FIG. 1 is an ultraviolet irradiation device that irradiates a fluid such as water with ultraviolet rays, and is connected to a water channel 2 and a tube 3 through which a fluid such as water flows, and the tube 3 A transmission surface 3a that transmits ultraviolet rays from the outside and a reflection surface 4 that reflects ultraviolet rays inside the tube body 3 are provided. Further, the reflection surface 4a is provided outside the tube body 3 and passes through the transmission surface 3a of the tube body 3. An ultraviolet light emitting diode 7 for irradiating the flowing fluid with ultraviolet rays is provided. The ultraviolet light emitted from the ultraviolet light emitting diode 7 is reflected in the direction inclined with respect to the flow direction of water and reflected by the reflecting surface 4.
The fluid flowing through the ultraviolet irradiation device 1 is, for example, raw water source corresponding to risk level 3 in the “Guidelines for Countermeasures for Cryptosporidium in Waterworks” set by the Ministry of Health, Labor and Welfare in 2007, or coagulated sediment-filtered water that has been properly treated Is common.

  The transmission surface 3a is configured such that at least a part of the pipe of the tube 3 is a transmission tube such as a quartz tube that transmits ultraviolet rays, and a reflection surface 4 is provided on a part of the outer surface of the transmission tube. The cylindrical reflecting surface 4 provided on the outer surface side of the tubular body 3 made of this transmission tube is formed in close contact with or in contact with the tubular body 3 by, for example, silver vapor deposition or a stainless steel tube. The reflecting surface 4 is made of a reflecting tube such as a stainless tube having a mirror finish on the inner surface of at least a part of the pipe portion 3 of the tubular body 3 to enhance the reflection efficiency of ultraviolet rays, and a part of the reflecting tube is opened 4a. It is also possible to provide the transmission surface 3a by providing a window body made of quartz glass or the like that is opened with a window that transmits ultraviolet rays from the outside.

  An annular unit 6 formed in a ring shape on the outer surface of the reflection surface 4 is disposed in the region of the tube 3 made of a transmission tube such as a quartz tube. A plurality of, for example, two sets of annular units 6 are provided outside the tube body 3 at predetermined intervals in the longitudinal direction. One of the upstream units is indicated by reference numeral 6A, and the other downstream side is indicated by reference numeral 6B. Shall. In the annular unit 6, ultraviolet light emitting diodes (LEDs) 7 are arranged at predetermined intervals in the circumferential direction. Moreover, the ultraviolet light L emitted from the ultraviolet light-emitting diode 7 forms an acute angle α with respect to the water flow direction W, unlike the conventional irradiation direction irradiated in a direction orthogonal to the water flow direction W. In this way, it is irradiated with an inclination.

  As a first modification of the ultraviolet irradiation device 1 of the first embodiment, an annular unit 6C may be provided as shown in FIG. The annular unit 6c has a configuration in which a reflecting plate 8 is provided in the immediate vicinity of the ultraviolet light emitting diode 7 to reflect the ultraviolet light, and the ultraviolet light passes through the opening 4a of the reflecting surface 4 and the transmitting surface 3a of the tubular body 3 so The water stream is irradiated obliquely. With respect to the irradiation of the annular unit 6C, the ultraviolet ray L parallel to the flow of water outside the tubular body 3 irradiated from the ultraviolet light emitting diode 7 is incident on the tubular body 3 through the reflector 8 with a certain incident angle α. It can be made incident. In this case, the incident angle α can be adjusted by adjusting the angle of the reflecting plate 8.

  In the first embodiment, as shown in FIG. 2, the ultraviolet light L emitted from the emission port of the ultraviolet light-emitting diode 7 is transmitted through the transmission surface 3 a of a transmission tube such as a quartz tube that is the tube body 3. Since 4 does not pass through, an opening 4 a for allowing the ultraviolet light L to pass through the reflecting surface 4 is formed for each ultraviolet light-emitting diode 7. In addition, the ultraviolet light-emitting diodes 7 are arranged at an inclination of a predetermined angle in the annular unit 6 so that the ultraviolet light L travels at an angle α with respect to the water flow direction W. The reflecting surface 4 is disposed on the downstream side of the annular unit 6, that is, on the tube body 3 in the ultraviolet irradiation direction.

Further, the treatment method using ultraviolet light emitted from the ultraviolet light emitting diode 7 can be applied to nucleic acid (DNA) by adding light energy in the ultraviolet region to cryptosporidium which is a chlorine-resistant pathogenic organism (microorganism) in the raw water of the pipe 3. ) Is inactivated by damage. For that purpose, it is necessary to always secure an irradiation amount of ultraviolet rays (especially around a wavelength of 253.7 nm) of 10 mJ / cm ² or more for 95% or more of the amount of water passing through the ultraviolet irradiation region (this irradiation intensity is reduced). Called design value). Moreover, the water to be treated is assumed to have a turbidity of 2 degrees or less, a chromaticity of 5 degrees or less, and a transmittance of ultraviolet rays in the vicinity of a wavelength of 253.7 nm exceeding 75% (ultraviolet absorbance is less than 0.125 abs./10 mm). The ultraviolet irradiation amount (mJ / cm ² ) is a product of the irradiation intensity (mW / cm ² ) and the irradiation time (s).

The ultraviolet rays L emitted from the respective ultraviolet light emitting diodes 7 of the annular unit 6 at an inclination of a predetermined angle α pass through the water flow of the tubular body 3, pass through the wall surface of the tubular body 3, and are totally reflected by the reflecting surface 4. It will return to the water stream inside. And the ultraviolet light L irradiated from each ultraviolet light-emitting diode 7 provided outside the tube 3 is reflected on the reflecting surface 4 and repeatedly irradiated in the water flow direction W, whereby the light intensity gradually decreases.
Therefore, by providing the second annular unit 6B at an arbitrary interval, the irradiation intensity of light is increased, the irradiation intensity satisfying the design value is maintained at any place in the apparatus, and a predetermined ultraviolet irradiation amount with respect to the water flow is set. Can be ensured, and safety is improved. Thus, by providing a plurality of annular units 6A and 6B, it is possible to cope with an increase in the flow rate of the fluid, that is, an increase in the flow velocity.

Thus, two sets of annular units 6A and 6B are installed outside the pipe body 3 at a predetermined interval with respect to the water flowing in the pipe body 3, and are sufficient to inactivate Cryptosporidium and the like. Over time and distance, the ultraviolet light L can be irradiated to 95% or more of the amount of water during that time. In other words, the two sets of annular units 6A and 6B set the amount of water to such an extent that the irradiation amount of the ultraviolet light L can always be kept at 10 mJ / cm ² or more with respect to 95% or more of the amount of water. Control to flow in.

The ultraviolet irradiation device 1 according to the first embodiment has the above-described configuration. Next, an ultraviolet irradiation method will be described.
The ultraviolet irradiating device 1 supplies water from each ultraviolet light emitting diode 7 in the first annular unit 6A provided on the upstream side of the tube 3 made of a transmission tube such as a quartz tube with respect to the water to be treated passing through the device. The ultraviolet ray L is irradiated at an angle α with respect to the flow direction W. Each ultraviolet ray L irradiates a water stream at an inclination angle α, inactivates Cryptosporidium, etc., passes through the tube body 3 of a transmission tube such as a quartz tube, and is totally reflected by the outer reflection surface 4, and again flows the water stream. Irradiates to inactivate Cryptosporidium and the like. In this way, the ultraviolet light L is reflected by the reflecting surface 4 provided outside the tube 3 and inactivates Cryptosporidium in water, and the intensity of light gradually decreases.

The second annular unit 6B is disposed in a region before the irradiation intensity of the ultraviolet light L from the first annular unit 6A becomes lower than the design value, and new ultraviolet light is emitted from each ultraviolet light emitting diode 7 of the annular unit 6B. Similarly, L is irradiated to the water stream in the tube 3 at an angle α, and the Cryptosporidium and the like in the water stream are inactivated while repeating the reflection on the reflecting surface 4.
In this way, the water flow is caused by the ultraviolet rays L irradiated from the ultraviolet light-emitting diodes 7 of the two sets of annular units 6A and 6B spaced apart from each other by a predetermined distance in the water flow direction W with respect to the water flow flowing in the pipe body 3 of the water channel 2. Cryptosporidium in the inside is inactivated or sterilized continuously. In addition, the distance between the first annular unit 6A and the second annular unit 6B is defined as the maximum distance before the light intensity of each ultraviolet light-emitting diode 7 of the first annular unit 6A falls below, for example, 10 mJ / cm ² as an irradiation amount. It is preferable to do.

  As described above, according to the ultraviolet irradiating device 1 according to the first embodiment, the ultraviolet rays L are emitted from the ultraviolet light emitting diodes 7 of the annular units 6A and 6B provided at predetermined intervals outside the tubular body 3 at a predetermined angle. By irradiating the water stream with α, and repeatedly irradiating the water stream with ultraviolet rays while totally reflecting off the reflecting surface 4 on the outer side of the tube 3, the microorganisms in the water are efficiently inactivated and sterilized by the ultraviolet rays. Can do. Moreover, since the plurality of sets of annular units 6A and 6B can continuously irradiate the water stream with ultraviolet light having a predetermined intensity or more over a long distance, it is possible to reliably inactivate and sterilize the microorganisms in the water, and to treat the amount of water Will increase.

  In addition, since the annular units 6A and 6B are provided in a plurality of stages, even when the ultraviolet light emitting diode 7 of one annular unit 6 fails, the ultraviolet light can be irradiated to the water flow by the ultraviolet light emitting diode 7 of the other annular unit 6. In addition, since the annular units 6A and 6B are installed outside the pipe body 3, they can be easily removed and repaired or inspected easily in the event of a failure or maintenance. Further, even if the annular unit 6 or the ultraviolet light emitting diode 7 is damaged, it does not enter the water.

  Note that the present invention is not limited to the ultraviolet irradiation device 1 according to the first embodiment described above, and can be appropriately changed or replaced without departing from the scope of the present invention. include. Although other embodiments and modifications of the present invention will be described below, the same or similar parts and members as those of the above-described embodiment will be denoted by the same reference numerals, and description thereof will be omitted.

In the first embodiment described above, two sets of the annular units 6A and 6B are arranged at a predetermined interval. However, if the tube body 3 has a relatively small diameter or a small amount of water, the annular unit 6 and the reflecting surface 4 are connected. Only one set may be provided. Even in this case, the ultraviolet light L from the ultraviolet light emitting diodes 7 in the annular unit 6 arranged outside the tubular body 3 is irradiated on the water flow in the tubular body 3 and repeatedly reflected on the reflecting surface 4, so that the predetermined length range can be obtained. Therefore, it is possible to always ensure an ultraviolet irradiation amount (light intensity) of 10 mJ / cm ² or more for 95% or more of the water flow, and to inactivate and sterilize microorganisms efficiently.
Further, when the inner diameter, the amount of water, or the flow rate of the tube body 3 is large enough to inactivate and sterilize microorganisms in the water flow with the two sets of annular units 6A and 6B, three or more sets of the annular units 6 are predetermined. What is necessary is just to arrange | position the reflective surface 4 by setting to a space | interval.

Next, FIG. 4 shows the 2nd modification of the ultraviolet irradiation device 1 by 1st embodiment of this invention. According to this modification, the cylindrical reflecting surface 4 made of, for example, vapor deposition or stainless steel is disposed on the inner surface side of the tube 3 that is a transmission tube such as a quartz tube.
According to the ultraviolet irradiation device 1 according to this modification, the ultraviolet light L irradiated from the ultraviolet light-emitting diode 7 does not pass through the tube body 3 which is a transmission tube such as a quartz tube, but is reflected inside and returned to the water flow. For this reason, it is possible to more efficiently irradiate the water stream with ultraviolet rays while suppressing the decrease in the intensity of the ultraviolet rays L.

Next, an ultraviolet irradiation device 10 according to a second embodiment of the present invention will be described with reference to FIGS.
In the present invention, when the inner diameter of the tube body 3 is relatively large, the ultraviolet rays L irradiating the water stream obliquely from the outside of the tube body 3 do not reach the full width of the inner diameter of the tube body 3 or inactivate microorganisms even if it reaches. If the dose is less than 10 mJ / cm ² (for example, 10 mJ / cm ² or more), or there is a risk that the intensity of light will be weakened by reflection once or twice. The ultraviolet irradiation device 10 according to the second embodiment can maintain a necessary light intensity even in such a case.

That is, in the second embodiment, the necessary irradiation amount (for example, 10 mJ / cm ² or more) of the light from the ultraviolet light-emitting diode 7 in the second annular unit 6B is maintained inside the tubular body 3 from the first annular unit 6A. The reflecting plate 11 was installed as a reflecting member over the power range. That is, the reflecting plate 11 was formed in a cross-shaped cross section over the above range so as to divide the inner surface of the tube body 3 into quarter circles.

  According to this configuration, as shown in FIG. 6, the 1/4 cylindrical reflection surface 4 disposed on the inner surface side of the tube body 3 and the reflection plate 11 partitioned at right angles with the center of the tube body 3 as a corner. Can be divided into four sectional fan-shaped spaces 12 surrounded by. Therefore, the ultraviolet rays L irradiated obliquely in the water flow direction W from the ultraviolet light emitting diodes 7 arranged in each annular unit 6 are reflected by one of the reflecting plates 11 forming a right angle and further reflected by the other, and are cylindrical. Therefore, it is possible to reliably irradiate all of the water flow in the space 12 with ultraviolet light having high light intensity.

  According to the second embodiment, the inside of the relatively large-diameter tube body 3 is divided into four spaces 12 having a sectoral cross section by the reflecting plate 11, so that the distance until the ultraviolet rays L are reflected is 1/2 or less. It is possible to reliably inactivate microorganisms in the water while maintaining the required light intensity over a longer distance.

In the second embodiment described above, the reflective surface 4 is formed on the inner surface side of the tubular body 3, but the reflective surface 4 may be formed on the outer surface side of the tubular body 3.
Moreover, the ultraviolet irradiation device 10 according to the present embodiment is not limited to the configuration in which the reflecting plate 11 that partitions the inner surface of the tubular body 3 is formed in a cross shape and divided into four spaces 12. For example, a reflecting plate 11 that partitions the tubular body 3 into a semicircle of a half circle may be provided, or as shown in FIG. 7, a radial shape in which the inner surface of the tubular body 3 is partitioned at intervals of 120 °. The three spaces 12 may be formed by the three reflecting plates 11. In the present invention, the number of reflectors 11 that divide the inner surface of the tube 3 is arbitrary.

Next, an ultraviolet irradiation device 15 according to a third embodiment of the present invention will be described with reference to FIG.
In this embodiment, the tube body 3 is made of a permeation tube such as a quartz tube. Among the annular units 6A and 6B provided outside the tube body 3, for example, the first annular unit 6A located on the upstream side is the tube body 3. The second annular unit 6B disposed on the downstream side is reciprocally movable along the tube 3.

Moreover, the second annular unit 6B is provided with cylindrical reflecting surfaces 16a and 16b on the upstream side and the downstream side thereof. The upstream reflective surface 16a is made of, for example, a soft and deformable film-like sheet, and a reflective film that reflects ultraviolet rays is applied or coated on the inner surface of the sheet, or the sheet is formed of a reflective material. The reflective film may be a silver vapor deposition or a reflective sheet, and any reflective and soft material can be employed.
The upstream reflective surface 16a is moved over the first annular unit 6A and held in a state of being pulled by the first spring 17 or the like. A ring-shaped guide member 18 that presses the reflecting surface 16a against the outer surface of the tubular body 3 is fixedly disposed in the vicinity of the downstream side of the first annular unit 6A.

  The downstream reflecting surface 16b may be made of the same material as the upstream reflecting surface 16a, or may be a highly rigid cylindrical reflecting material such as stainless steel. And the 2nd spring 19 is connected to the lower end part of the downstream reflective surface 16b, and has pulled the downstream reflective surface 16b to the downstream. The urging force of the first spring 18 is set to be larger than the urging force of the second spring 19, and the second annular unit 6 </ b> B uses a position in contact with or close to the guide member 18 as a reference position.

In addition, the second annular unit 6B or the downstream reflecting surface 16b is connected to driving means such as a take-up motor 20 for pulling the second annular unit 6B to the downstream side at a low speed. The annular unit 6B overcomes the difference in urging force between the first spring 17 and the second spring 19 and moves to the downstream side while being guided by the tube 3, and the position where the upstream reflecting surface 16a is stretched, that is, the first The second annular unit 6B can be moved to a position before the light intensity of each ultraviolet light emitting diode 7 of the annular unit 6A falls below, for example, 10 mJ / cm ² as an irradiation amount.

And the light of the diagonal direction inject | emitted from each ultraviolet light emitting diode 7 of 1st and 2nd annular unit 6A, 6B irradiates a water flow, permeate | transmits the tubular body 3, and reflects on the reflective surfaces 16a and 16b, and is a pipe | tube. It goes to the inside of the body 3. When the take-up motor 20 is turned off, the second annular unit 6B slowly returns toward the first annular unit 6A due to the difference in urging force between the first spring 17 and the second spring 19.
When the second annular unit 6B moves from the upstream side to the downstream side, the water flow in the tube body 3 gradually increases, and when returning from the downstream side to the upstream side, the water flow is in the opposite direction to the water flow. Even if the irradiation range of ultraviolet rays is short, the entire amount of water is irradiated with ultraviolet rays L so that the microorganisms can be controlled to be inactivated.

  The ultraviolet irradiation device 15 according to the third embodiment has the above-described configuration, and an ultraviolet irradiation method will be described next. In this embodiment, from the state where the second annular unit 6B is in the initial position close to the first annular unit 6A via the guide member 18, the winding motor 20 is turned on according to the increase in the amount of water in the tubular body 3. Then, by pulling the second annular unit 6B downstream along the tube body 3, the upstream reflecting surface 16a is gradually pulled out downstream. At that time, the microorganisms in the water can be sufficiently inactivated within a range in which the light intensity of the ultraviolet light emitted from the ultraviolet light emitting diodes 7 of the first and second annular units 6A and 6B in the oblique direction of the water flow has a required intensity. Adjust the amount of water so that

Since the reflecting surface 16a on the upstream side of the second annular unit 6B is pulled by the take-up motor 20, it is guided by the guide member 18 disposed on the downstream side of the first annular unit 6A and is in close contact with the outer surface of the tubular body 3. To be guided. In addition, since the reflecting surface 16b on the downstream side is made of stainless steel or the like having high rigidity, the reflecting region that gradually inactivates microorganisms in the water stream is gradually moved while maintaining the region of the reflecting surface at a predetermined length. Increase.
And in the area | region where the reflective surface 16a of the upstream side extended to the maximum, the reflective area | region which inactivates the microorganisms in a water flow becomes the maximum, and the to-be-processed water amount in the pipe body 3 also becomes the maximum. The second annular unit 6B can be kept in this state and continuously irradiated with ultraviolet light L having a predetermined light intensity for a large amount of water over a predetermined range.

Thereafter, even when the amount of water flowing through the tube 3 is reduced, the range of the first and second annular units 6A and 6B and the reflecting surfaces 16a and 16b on the upstream and downstream sides is maintained at the maximum to sterilize the water flow. Good.
In order to move the second annular unit 6B to the first annular unit 6A side according to the decrease in the amount of water, the winding motor 20 is turned off and the first spring 17 and the second spring 19 are driven by the difference in urging force. The bicyclic unit 6B may be moved upstream. By moving the second annular unit 6B to the upstream side, the reflection range of the ultraviolet rays L by the reflection surfaces 16a and 16b is reduced, and it is possible to cope with the reduction in the amount of water.

As described above, according to the ultraviolet irradiation device 15 according to the third embodiment, when the amount of water in the tube body 3 gradually increases, the second annular member movable relative to the fixed first annular unit 6A accordingly. By moving the unit 6B to the downstream side and lengthening the reflection surface 16a between the first annular unit 6A, the reflection region of the ultraviolet light L can be increased, and the region where microorganisms can be inactivated or sterilized can be increased.
When the amount of water decreases, the state of the high intensity ultraviolet light L emitted from each ultraviolet light emitting diode 7 is maintained by maintaining the state as it is or by bringing the second annular unit 6B closer to the first annular unit 6A. It can be concentrated in a short range and the efficiency of inactivation or sterilization of microorganisms in water is improved.

In the third embodiment described above, the movable second annular unit 6B is disposed on the downstream side of the fixed first annular unit 6A. Instead, the movable second annular unit 6B is disposed on the upstream side of the first annular unit 6A. The bicyclic unit 6B may be arranged so as to be movable upstream.
The second annular unit 6B may be moved manually without using the take-up motor 20.
Further, in each of the above-described embodiments, the ultraviolet light emitting diodes 7 are arranged in the ring-shaped annular unit 6, but the ultraviolet light emitting diodes 7 may be installed directly outside the tubular body 3 without providing the annular unit 6. Good.

Moreover, although each embodiment mentioned above demonstrated the disinfection apparatus which inactivates or disinfects the water for clean water as an ultraviolet irradiation device, this invention is not limited to clean water, sewage and industrial water It can be applied to an apparatus that inactivates or sterilizes microorganisms contained in various fluids such as other fluids with ultraviolet rays.
In addition, about the arrangement | positioning space | interval of the 1st cyclic | annular unit 6A and the 2nd cyclic | annular unit 6B in the tubular body 3, the light intensity of each ultraviolet light emitting diode 7 in the 1st cyclic | annular unit 6a fell less than 10 mJ / cm < ² > as an irradiation amount, for example. The second annular unit 6B may be installed at the position, and even in this case, the water flow can be individually sterilized by each of the annular units 6A and 6B.

DESCRIPTION OF SYMBOLS 1, 10, 15 Ultraviolet irradiation device 2 Water channel 3 Piping 4 Reflecting surface 6 Annular unit 6A First annular unit 6B Second annular unit 7 Ultraviolet light emitting diode 11 Reflecting plate 12 Space 16a Upstream reflecting surface 16b Downstream reflecting surface 17 First spring 18 Guide member 19 Second spring 20 Winding motor L UV

Claims (8)

An ultraviolet irradiation device that irradiates a fluid such as water with ultraviolet rays,
Provided in the tubular body through which a fluid flows is a transmission surface that transmits ultraviolet light from the outside of the tubular body and a reflective surface that reflects ultraviolet light inside the tubular body,
An ultraviolet light emitting diode that radiates ultraviolet light to a fluid that is provided outside the tubular body and flows through the transmission surface of the tubular body;
The ultraviolet irradiation apparatus, wherein the ultraviolet light emitted from the ultraviolet light emitting diode is irradiated in a direction inclined with respect to a fluid flow direction and reflected by the reflecting surface.   The ultraviolet irradiation device according to claim 1, wherein a plurality of the ultraviolet light emitting diodes are arranged in a circumferential direction of the tubular body.   3. The ultraviolet irradiation device according to claim 1, wherein a plurality of sets of the annular units in which the ultraviolet light emitting diodes are arranged in the circumferential direction of the tubular body are arranged at intervals in the longitudinal direction of the tubular body.   The transmission surface is a transmission tube through which the tubular body transmits ultraviolet rays, and is formed on the transmission tube, and a reflection surface is provided on a part of the outer surface or the inner surface of the transmission tube. The ultraviolet irradiation device described in any one of the above.   The reflection surface is formed by a reflection tube whose inner surface of the tube body reflects ultraviolet rays, and a window body that opens a part of the reflection tube and transmits ultraviolet rays from the outside is provided as the transmission surface. The ultraviolet irradiation device described in any one of 1 to 3.   6. The ultraviolet irradiation device according to claim 1, wherein a reflection member is disposed inside the tube body, and ultraviolet rays emitted from the ultraviolet light emitting diode are reflected by the reflection member. 7. .   The ultraviolet irradiation device according to claim 6, wherein the reflecting member is configured to divide a cross section of the flow path of the tubular body into a plurality of equal parts.   With respect to the first annular unit fixedly arranged on the outer surface of the tubular body, the second annular unit having a reflecting surface arranged before and after the first annular unit is movably arranged, and the first and second annular units are arranged. The ultraviolet irradiation device according to claim 3, wherein the reflection surface is set between the units and upstream or downstream of the second annular unit to form a continuous reflection region of ultraviolet rays.

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