JP2017221903A - Ultraviolet irradiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultraviolet irradiation device where, the arrangement state of ultraviolet LEDs in the case a transparent tube made of quartz glass is used as a treatment tank is optimized.SOLUTION: Provided is an ultraviolet irradiation device where a plurality of ultraviolet LEDs are arranged at the outer circumference of a treatment tank made of tubular quartz glass having an ultraviolet reflection part at the inner circumferential face, and ultraviolet light from the ultraviolet LEDs is irradiated on the water to be treated flowing the inside of the treatment tank through irradiation holes formed at the treatment tank. The optical axis of the ultraviolet light passing through the irradiation holes from the ultraviolet light LEDs is tilted in a direction crossed with the axis of the treatment tank and also to the upstream side or the downstream side of the treatment tank to the straight line in the diameter direction of the treatment tank, and further, the intervals between the irradiation holes adjacent to the axial direction of the treatment tank do not become, provided that the intervals between the irradiation holes are defined as L, the inside diameter of the treatment tank is defined as D and the angle of the optical axis to the straight line in the diameter direction is defined as θ, the one no reaching L=2Dtanθ.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an ultraviolet irradiation device, and more particularly to an ultraviolet irradiation device that sterilizes microorganisms in water or oxidizes organic substances using ultraviolet rays in water purification treatment, sewage treatment, and the like.

  2. Description of the Related Art Conventionally, ultraviolet irradiation water treatment apparatuses that irradiate ultraviolet rays to sterilize and disinfect microorganisms and pathogenic protozoa contained in water to be treated are known. In recent years, ultraviolet LEDs have attracted attention as ultraviolet light sources, and ultraviolet irradiation water treatment apparatuses using ultraviolet LEDs are known in which a large number of ultraviolet LEDs are arranged inside a tube serving as a treatment tank. (For example, refer to Patent Document 1).

Special table 2009-532200 gazette

  As described above, when the ultraviolet LED is arranged inside the treatment tank, there is a problem in maintenance and the like, and therefore it is conceivable to arrange the ultraviolet LED outside. However, when an ultraviolet LED is disposed outside the processing tank, it is necessary to use a material that transmits ultraviolet light, for example, a transparent tube made of quartz glass, as the processing tank. It is necessary to optimize the arrangement state of the ultraviolet LED according to various conditions such as the refractive index of the LED.

  Then, this invention aims at providing the ultraviolet irradiation device which optimized the arrangement | positioning state of ultraviolet LED at the time of using the transparent tube made from quartz glass as a processing tank.

  In order to achieve the above object, the ultraviolet irradiation device of the present invention has a plurality of ultraviolet LEDs arranged on the outer periphery of a treatment vessel made of tubular quartz glass having a reflecting portion that reflects ultraviolet rays on the inner peripheral surface, In the ultraviolet irradiation apparatus that irradiates the water to be treated flowing in the treatment tank through the irradiation hole formed in the treatment tank, the plurality of ultraviolet LEDs are set at predetermined intervals in the circumferential direction of the outer periphery of the treatment tank. While being provided in a ring shape, ultraviolet LEDs provided in the ring shape are provided at a plurality of locations at predetermined intervals in the axial direction of the processing tank, and the optical axis of each ultraviolet ray passing through the irradiation hole is set in the processing tank. And incline at an angle set in advance on the upstream side or downstream side of the processing tank with respect to the straight line in the diameter direction of the processing tank, Irradiation holes that transmit ultraviolet rays from the ultraviolet LED adjacent in the axial direction of L are the distance between the irradiation holes in the processing tank axis direction L, the inner diameter of the processing tank D, and the angle of the optical axis with respect to the straight line in the diameter direction. It is characterized in that it is not provided at a position where L = 2Dtanθ, where θ.

  Further, in the ultraviolet irradiation device of the present invention, the angle θ of the optical axis with respect to the straight line in the diameter direction is in the range of 15 to 25 degrees, the inner diameter of the treatment tank is 200 mm, and the wall thickness of the tube wall is It is 6.5 mm, the angle θ is 20 degrees, and the irradiation holes are provided at 30 positions at equal intervals in the circumferential direction.

  According to the ultraviolet irradiation device of the present invention, it is possible to efficiently perform ultraviolet treatment on the water to be treated flowing in the treatment tank. Thereby, it is possible to improve the ultraviolet processing efficiency while minimizing the number of installed UV LEDs and reducing the power consumption.

It is explanatory drawing which shows one example of the ultraviolet irradiation device of this invention. It is explanatory drawing which shows the example of arrangement | positioning of ultraviolet LED to a processing tank outer periphery. It is a figure which shows the relationship between angle (theta) of ultraviolet LED, and incident energy W. FIG.

  1 and 2 show one embodiment of the ultraviolet irradiation device of the present invention. The ultraviolet irradiation device 11 is configured so that a plurality of ultraviolet LEDs 13 are formed in a ring shape while being mounted on a ring-shaped LED support member including a ring-shaped electric wiring board (not shown) on the outer periphery of a treatment tank 12 made of tubular quartz glass. It is arranged. The treatment tank 12 is formed with a reflection portion 12a that is subjected to a treatment for reflecting ultraviolet rays at least on the inner peripheral surface, and ultraviolet rays from the ultraviolet LED 13 are irradiated into the treatment tank 12 through the ultraviolet rays. Irradiation holes 12b are provided respectively. The ultraviolet LEDs 13 are provided at equal intervals in the circumferential direction of the ring-shaped LED support member, and the optical axis A of the ultraviolet rays irradiated from the ultraviolet LEDs 13 through the irradiation holes 12b is the processing tank 12. In a state of being inclined at an angle θ set in advance on the upstream side or the downstream side of the water to be treated flowing in the treatment tank 12 with respect to the straight line R in the diameter direction of the treatment tank 12 in the direction intersecting the axis C of Is set.

  Moreover, the said ring-shaped LED support member is arrange | positioned in the direction of the axis line C of the said processing tank 12 in multiple places by the preset space | interval. The interval between adjacent ring-shaped LED support members, that is, the irradiation holes 12b that transmit the ultraviolet rays from the ultraviolet LEDs 13 adjacent in the axial direction of the processing tank 12 into the processing tank 12 are in the processing tank axial direction between the irradiation holes 12b. When the interval is L, the inner diameter of the treatment tank 12 is D, and the angle of the optical axis A with respect to the straight line R in the diameter direction is θ, it is not provided at a position where L = 2Dtanθ. In other words, in FIG. 1, the optical axis of the ultraviolet ray irradiated from one ultraviolet LED 13 through the irradiation hole 12b into the treatment tank 12 and reflected by the reflecting portion 12a on the inner surface of the treatment tank 12 is the second ultraviolet ray adjacent to the ultraviolet ray. The position is set to be different from the irradiation hole 12 b corresponding to the LED 13.

  By arranging the ultraviolet LED 13 and the irradiation hole 12b at such an angle θ and the interval L, the ultraviolet rays from the respective ultraviolet LEDs 13 can be irradiated to the entire inside of the processing tank 12, and the processing target flowing in the processing tank 12 can be obtained. It is possible to efficiently perform ultraviolet treatment of water.

  Next, a tubular processing tank 12 made of quartz glass having an inner diameter of 200 mm, a tube wall thickness of 6.5 mm, and a refractive index of 1.49994 is used, and an ultraviolet LED 13 adjacent in the axial direction of the processing tank 12 and The interval L between the irradiation holes 12b is fixed to 15 mm, and the angle θ of the optical axis A of the ultraviolet rays passing through the irradiation holes 12b is changed from 0 degree to 30 degrees every 5 degrees, and the incident amount into the processing tank 12 Was measured respectively. As a result, the relationship between the angle θ of the optical axis and the incident energy W as shown in FIG. 3 was obtained. This shows that the incident energy W is maximized when the angle θ is 20 degrees. From this, it can be seen that the optimum value of the angle θ of the optical axis of the ultraviolet rays irradiated into the treatment tank 12 is 20 degrees.

  Further, when the inner diameter of the irradiation hole 12b is F, the interval L between the adjacent irradiation holes 12b is set to L = 2Dtanθ + F or L = 2Dtanθ−F, so that the optical axis of the reflected light is changed from the irradiation hole 12b. Since the position can be shifted, the amount of ultraviolet light that is not reflected by the irradiation hole 12b can be reduced, and the amount of reflected ultraviolet light in the treatment tank 12 can be increased.

  In addition, the ultraviolet LED to be used can use a general thing, and the structure of a ring-shaped LED support member can also employ | adopt a general structure. Further, it is not necessary to align all the optical axes of the ultraviolet rays in the same direction, and those directed toward the upstream side and those directed toward the downstream side can be mixed. Further, the reflecting portion can be formed by a known method such as deposition of a material that reflects ultraviolet rays, for example, metal.

DESCRIPTION OF SYMBOLS 11 ... Ultraviolet irradiation apparatus, 12 ... Processing tank, 12a ... Reflection part, 12b ... Irradiation hole, 13 ... Ultraviolet LED, A ... Optical axis of ultraviolet light, C ... Axis of processing tank, D ... Inner diameter of processing tank, L ... Processing Interval between irradiation holes adjacent in the axial direction of the tank, R ... straight line in the diameter direction

Claims (3)

  A plurality of ultraviolet LEDs are arranged on the outer periphery of a tubular quartz glass treatment tank having a reflection part for reflecting ultraviolet rays on the inner peripheral surface, and ultraviolet rays from the ultraviolet LEDs are irradiated into the treatment tank through irradiation holes formed in the treatment tank. In the ultraviolet irradiation device that irradiates the water to be treated flowing through the plurality of ultraviolet LEDs, the plurality of ultraviolet LEDs are provided in a ring shape at predetermined intervals in the circumferential direction of the outer periphery of the treatment tank, and the ultraviolet light provided in the ring shape. LEDs are provided at a plurality of locations at predetermined intervals in the axial direction of the processing tank, and the optical axis of each ultraviolet ray passing through the irradiation hole is in a direction crossing the axial line of the processing tank, and in the diameter direction of the processing tank Are inclined at an angle set in advance to the upstream or downstream side of the treatment tank, and ultraviolet rays from adjacent UV LEDs in the axial direction of the treatment tank are transmitted. In other words, the irradiation hole is a position where L = 2Dtanθ, where L is the interval between the irradiation holes in the axial direction of the processing tank, D is the inner diameter of the processing tank, and θ is the angle of the optical axis with respect to the straight line in the diameter direction. An ultraviolet irradiation device characterized in that it is not provided in the device.   The ultraviolet irradiation apparatus according to claim 1, wherein an angle θ of the optical axis with respect to the straight line in the diameter direction is in a range of 15 to 25 degrees.   The inner diameter of the treatment tank is 200 mm, the wall thickness of the tube wall is 6.5 mm, the angle θ is 20 degrees, and the irradiation holes are provided at 30 positions at equal intervals in the circumferential direction. The ultraviolet irradiation apparatus according to claim 1 or 2, characterized in that:

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