JP6807174B2 - Ultraviolet irradiation device - Google Patents

Description

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

Conventionally, an ultraviolet irradiation water treatment device that sterilizes or disinfects microorganisms and pathogenic protozoans contained in the water to be treated by irradiating with ultraviolet rays has been known. In recent years, ultraviolet LEDs have been attracting attention as an ultraviolet light source, and as an ultraviolet irradiation water treatment device using an ultraviolet LED, a device in which a large number of ultraviolet LEDs are arranged inside a tube body serving as a treatment tank is known. (See, for example, Patent Document 1.).

Special Table 2009-532200

As described above, when the ultraviolet LED is arranged inside the processing tank, it is conceivable to arrange the ultraviolet LED on the outside because there is a difficulty in maintainability and the like. However, when the ultraviolet LED is arranged outside the processing tank, it is necessary to use a material that transmits ultraviolet rays, for example, a transparent tube made of quartz glass, as the processing tank, but the wall thickness and inner diameter of the tube wall and quartz glass It is necessary to optimize the arrangement state of the ultraviolet LED according to various conditions such as the refractive index of the ultraviolet LED.

Therefore, an object of the present invention is to provide an ultraviolet irradiation device that optimizes the arrangement state of ultraviolet LEDs when a transparent tube made of quartz glass is used as a processing tank.

In order to achieve the above object, in the ultraviolet irradiation device of the present invention, a plurality of ultraviolet LEDs are arranged on the outer periphery of a processing tank made of tubular quartz glass having a reflecting portion for reflecting ultraviolet rays on the inner peripheral surface, and the ultraviolet LEDs are used. In the ultraviolet irradiation device that irradiates the water to be treated flowing in the treatment tank through the irradiation holes formed in the treatment tank, the plurality of ultraviolet LEDs are arranged at preset intervals in the circumferential direction of the outer periphery of the treatment tank. In addition to being provided in a ring shape, ultraviolet LEDs provided in the ring shape are provided at a plurality of locations at preset intervals in the axial direction of the treatment tank, and the optical axes of each ultraviolet ray passing through the irradiation holes are set in the treatment tank. An ultraviolet LED that is inclined in the direction intersecting the axis of the treatment tank and at a preset angle on the upstream side or the downstream side of the treatment tank with respect to the straight line in the radial direction of the treatment tank, and is adjacent to the axis direction of the treatment tank. For the irradiation holes that transmit ultraviolet rays from the ultraviolet rays, the distance between the irradiation holes in the axial direction of the treatment tank is L, the inner diameter of the treatment tank is D, the angle of the optical axis with respect to the straight line in the radial direction is θ, and the inner diameter of the irradiation hole is defined as θ. When F is set , it is provided at a position where L = 2Dtanθ + F or L = 2Dtanθ−F, and the angle θ of the optical axis with respect to the straight line in the radial direction is in the range of 15 to 25 degrees .

Furthermore, the ultraviolet irradiation apparatus of the present invention is the internal diameter of the pre-Symbol treatment tank is 200 mm, a wall of thickness is 6.5 mm, the angle θ is 20 degrees, the illumination hole is circumferentially equal It is characterized in that it is provided at 30 places at intervals.

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. As a result, the number of installed ultraviolet LEDs can be minimized, power consumption can be reduced, and the ultraviolet processing efficiency can be improved.

It is explanatory drawing which shows one form example of the ultraviolet irradiation apparatus of this invention. It is explanatory drawing which shows the arrangement example of the ultraviolet LED on the outer periphery of a processing tank. It is a figure which shows the relationship between the angle θ of the ultraviolet LED and the incident energy W.

1 and 2 show an example of an ultraviolet irradiation device of the present invention. The ultraviolet irradiation device 11 has a plurality of ultraviolet LEDs 13 in a ring shape while being mounted on a ring-shaped LED support member provided with a ring-shaped electric wiring substrate or the like (not shown) on the outer periphery of a processing tank 12 made of tubular quartz glass. It is arranged. The treatment tank 12 is formed with a reflecting portion 12a that has been subjected to a treatment for reflecting ultraviolet rays on at least the inner peripheral surface, and the portion that irradiates the treatment tank 12 with the ultraviolet rays from the ultraviolet LED 13 transmits the ultraviolet rays. Irradiation holes 12b are provided for each. 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 emitted from the ultraviolet LEDs 13 through the irradiation holes 12b is the processing tank 12. In a state of being inclined at a preset angle θ on the upstream side or the downstream side of the water to be treated flowing in the processing tank 12 with respect to the straight line R in the radial direction of the processing tank 12 in the direction intersecting the axis C of the above. It is set.

Further, the ring-shaped LED support members are arranged at a plurality of locations in the direction of the axis C of the processing tank 12 at preset intervals. The distance between the adjacent ring-shaped LED support members, that is, the irradiation holes 12b that transmit the ultraviolet rays from the ultraviolet LED 13 adjacent to the processing tank 12 in the axial direction into the processing tank 12 is in the processing tank axial direction between the irradiation holes 12b. When the interval is L, the inner diameter of the processing tank 12 is D, and the angle of the optical axis A with respect to the straight line R in the radial direction is θ, it is not provided at a position where L = 2Dtanθ. That is, in FIG. 1, the optical axis of the ultraviolet rays irradiated from one ultraviolet LED 13 through the irradiation hole 12b into the processing tank 12 and reflected by the reflecting portion 12a on the inner surface of the processing tank 12 is the adjacent second ultraviolet rays. The position is set to be different from the irradiation hole 12b corresponding to the LED 13.

By arranging the ultraviolet LED 13 and the irradiation holes 12b at such an angle θ and an interval L, the ultraviolet rays from each ultraviolet LED 13 can be irradiated to the entire inside of the processing tank 12, and the object to be treated flowing in the processing tank 12. Ultraviolet treatment of water can be performed efficiently.

Next, using 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, the ultraviolet LED 13 and the ultraviolet LED 13 adjacent to the processing tank 12 in the axial direction are used. The distance L between the irradiation holes 12b is fixed at 15 mm, the angle θ of the optical axis A of the ultraviolet rays passing through the irradiation holes 12b is changed from 0 degrees to 30 degrees every 5 degrees, and the amount of incident incident into the treatment tank 12 Were 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. From this, it can be seen 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 irradiating into the treatment tank 12 is 20 degrees.

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

As the ultraviolet LED to be used, a general one can be used, and a general structure can be adopted as the structure of the ring-shaped LED support member. Further, it is not necessary to align the optical axes of all the ultraviolet rays in the same direction, and it is possible to mix those directed to the upstream side and those directed to the downstream side. Further, the reflective portion can be formed by a well-known method such as vapor deposition of a material that reflects ultraviolet rays, for example, metal.

11 ... UV irradiation device, 12 ... Processing tank, 12a ... Reflector, 12b ... Irradiation hole, 13 ... Ultraviolet LED, A ... Ultraviolet optical axis, C ... Processing tank axis, D ... Processing tank inner diameter, L ... Processing Distance between irradiation holes adjacent to the axis of the tank, R ... Straight line in the radial direction

Claims (2)

A plurality of ultraviolet LEDs are arranged on the outer periphery of a processing tank made of tubular quartz glass having a reflecting portion that reflects ultraviolet rays on the inner peripheral surface, and the ultraviolet rays from the ultraviolet LEDs are passed through the irradiation holes formed in the processing tank into the processing tank. In the ultraviolet irradiation device that irradiates the flowing water to be treated, the plurality of ultraviolet LEDs are provided in a ring shape at preset intervals in the circumferential direction of the outer periphery of the treatment tank, and the ultraviolet rays provided in the ring shape. LEDs are provided at a plurality of locations at preset intervals in the axial direction of the processing tank, and the optical axes of each ultraviolet ray passing through the irradiation holes intersect the axis of the processing tank and in the radial direction of the processing tank. The irradiation holes are inclined to the upstream side or the downstream side of the treatment tank at a preset angle with respect to the straight line of the above, and the irradiation holes are such that the ultraviolet rays from the ultraviolet LEDs adjacent to the axial direction of the treatment tank are transmitted. When the distance in the axial direction of the treatment tank is L, the inner diameter of the treatment tank is D, the angle of the optical axis with respect to the straight line in the radial direction is θ, and the inner diameter of the irradiation hole is F, L = 2Dtanθ + F or L = 2Dtanθ−. An ultraviolet irradiation device provided at a position of F , wherein the angle θ of the optical axis with respect to the straight line in the radial direction is in the 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 locations at equal intervals in the circumferential direction. The ultraviolet irradiation device according to claim 1 .

Images