JP2003236534A - Ultraviolet irradiation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultraviolet irradiation apparatus whose processing capability can be improved while suppressing its cost. <P>SOLUTION: This ultraviolet irradiation apparatus is provided with ultraviolet irradiation units 3 with a plurality of straight pipe-shaped ultraviolet lamps 15 inserted into one ultraviolet transmitting pipe 6, a support frame 5 for supporting the plurality of ultraviolet irradiation units 3, and a wiper 7 for wiping out the outer surface of the ultraviolet transmitting pipe 6 of the ultraviolet irradiation units 3 supported by the support frame 5. In such a configuration, ultraviolet radiation density from one ultraviolet irradiation unit 3 can be made high, and the installation interval between adjacent ultraviolet irradiation units 3 can be wider than when one straight pipe-shaped ultraviolet lamp is individually installed. The ultraviolet irradiation units 3 are formed by using inexpensive straight pipe-shaped ultraviolet lamps 15 as an ultraviolet lamp. Then, processing capability can be improved while suppressing the cost of the ultraviolet irradiation apparatus. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet irradiation device, and more particularly to an ultraviolet irradiation device suitable for ultraviolet treatment of fluids.

[0002]

2. Description of the Related Art When a fluid to be treated is irradiated with ultraviolet rays by an ultraviolet ray irradiator to perform purification treatment of the fluid by, for example, killing microorganisms in the fluid to be treated, oxidative decomposition of organic matter, or decomposition of other toxic substances. , By irradiating the fluid to be treated with ultraviolet rays by installing the ultraviolet ray irradiating device in the passage through which the fluid to be treated flows or by guiding the fluid to be treated to the ultraviolet ray irradiating device having a tank containing an ultraviolet lamp. ing. In such an ultraviolet irradiation device, the fluid to be processed in the flow path or the tank is treated so that the fluid to be processed receives the irradiation amount of ultraviolet rays necessary for the treatment as evenly as possible regardless of the position of the fluid to be processed, that is, the distance from the ultraviolet lamp. The number of UV lamps installed,
That is, it is desirable to determine the installation density of the ultraviolet lamps in the flow path and the tank.

For example, the sterilization rate is the number of surviving bacteria / the number of raw water bacteria =
It is represented by exp (−K · UV irradiation amount), and the UV irradiation amount is the product of the UV intensity I and the residence time of the fluid to be treated, that is, the UV irradiation time t, that is, the UV irradiation amount = I · t.
Is. Further, the ultraviolet intensity I decreases as the distance from the ultraviolet lamp increases. Therefore, if the residence time is constant, the number of UV lamps installed, that is, the installation density of the UV lamps in the flow path or tank, should be such that the UV intensity at the position farthest from the UV lamp becomes the required intensity. By determining, the fluid to be processed can receive the ultraviolet ray of the irradiation amount necessary for the treatment as evenly as possible regardless of the position of the fluid to be processed, that is, the distance from the ultraviolet lamp.

[0004]

By the way, as the installation density of the ultraviolet lamps becomes higher, the distance between the adjacent ultraviolet lamps becomes narrower. However, when the distance between the adjacent ultraviolet lamps becomes narrower, for example, the adjacent ultraviolet lamps become closer to each other. Dust and the like entrained in the fluid to be processed may be caught in the meantime. If dust gets caught between the adjacent UV lamps, the UV radiation will be blocked by the dust, or the flow path will be blocked and the fluid to be processed will not be able to flow through. I cannot receive the amount.

Further, the individual ultraviolet lamps provided in the ultraviolet irradiation device are inserted in the ultraviolet transmission tube,
There is an ultraviolet irradiation device provided with a wiper for removing stains or the like that interfere with the irradiation of ultraviolet rays on the outer surface of the ultraviolet ray transmission tube. In such an ultraviolet irradiation device, since the wiper is attached, the interval between the adjacent ultraviolet lamps is limited by the member forming the wiper. Therefore, in the ultraviolet irradiation device provided with the wiper, the ultraviolet lamps cannot be installed at the necessary intervals, and there may be a region where the fluid to be processed cannot receive the required ultraviolet irradiation amount in the channel or the tank. is there.

As described above, depending on the number of the ultraviolet lamps required for treating the fluid to be treated by ultraviolet irradiation, the fluid to be treated cannot receive the required amount of ultraviolet ray irradiation. The processing capacity may decrease. Therefore, even if the required number of ultraviolet lamps for the treatment of the fluid to be treated are installed, it is difficult for the fluid to be treated to receive the required amount of UV irradiation, and it is possible to improve the treatment ability. An irradiation device is desired.

On the other hand, as an ultraviolet lamp, an ultraviolet lamp in which one discharge tube is bent to form a U-shape,
It is conceivable to use an ultraviolet lamp in which two linear portions formed by bending one discharge tube into a U shape are further bent into a U shape to form four linear portions of the discharge tube. In the ultraviolet lamp formed by bending such a discharge tube into a U-shape, the ultraviolet radiation density from one ultraviolet lamp can be increased. Therefore, by forming a UV irradiation device using a UV lamp formed by bending such a discharge tube into a U-shape, the UV radiation density from one UV lamp is increased and one UV lamp is obtained. By increasing the range in which the required UV intensity is obtained, the number of installed UV lamps can be reduced, and the distance between adjacent UV lamps can be increased. In other words, a condition in which the fluid to be processed cannot receive the UV irradiation amount required for processing because dust or the like is caught between adjacent UV lamps or the UV lamps cannot be arranged at the required intervals due to the installation of wipers. Is less likely to occur, the throughput of the ultraviolet irradiation device can be improved.

However, in the ultraviolet lamp in which the discharge tube is bent and formed into a U shape, the cost of the ultraviolet lamp is increased because the ultraviolet lamp that requires the bending process of the discharge tube is used in manufacturing. This will increase the number of UV irradiation devices. Also, the UV lamp formed by bending the discharge tube into a U-shape is
The electric power per unit is large, for example, 1 kW or more, and a cooling mechanism or a cooling device for cooling the electrode portion is required. Further, a ballast and the like are more expensive than straight-tube ultraviolet lamps. This also increases the cost of the ultraviolet irradiation device. Therefore, there is a demand for an ultraviolet irradiation device that can improve the processing capacity while suppressing the device cost.

An object of the present invention is to improve the processing capacity while suppressing the device cost.

[0010]

The ultraviolet irradiating device of the present invention has the above-mentioned problems by having an ultraviolet irradiating unit in which a plurality of straight tube-shaped ultraviolet lamps are inserted into one ultraviolet permeable tube. To solve.

With such a structure, the ultraviolet radiation density from one ultraviolet irradiation unit depends on the radiation flux from a plurality of straight-tube ultraviolet lamps. Therefore, the ultraviolet radiation density from one ultraviolet irradiation unit is higher than the ultraviolet radiation density from one straight tube-shaped ultraviolet lamp. For this reason, the range in which the necessary ultraviolet intensity can be obtained by one ultraviolet irradiation unit is wider than the case where one straight tubular ultraviolet lamp is individually installed. Therefore, the installation interval between adjacent ultraviolet irradiation units is 1
It can be wider than if individual straight tube UV lamps were installed. Further, the ultraviolet irradiation unit is formed by using a straight tube type ultraviolet lamp as an ultraviolet lamp, which does not require bending of the discharge tube in manufacturing, and does not require a cooler or a relatively expensive ballast. There is. Therefore, the processing capacity can be improved while suppressing the device cost.

Further, an ultraviolet irradiation unit in which a plurality of straight tube type ultraviolet lamps are inserted in one ultraviolet ray transmitting tube,
A configuration is provided that includes a support frame that supports the plurality of ultraviolet irradiation units, and a wiper that wipes the outer surface of the ultraviolet transmission tube of the ultraviolet irradiation unit that is supported by the support frames. With such a configuration, even when the interval between the ultraviolet irradiation units adjacent to each other is limited by the attachment of the wiper, the processing capacity can be improved while suppressing the device cost.

If the ultraviolet irradiating unit has a reflecting member formed with a reflecting surface facing the surface portion of the ultraviolet lamp opposite to the surface of the ultraviolet ray transmitting tube side,
Since it is possible to reduce the amount of ultraviolet rays absorbed by other ultraviolet lamps in the ultraviolet ray irradiation unit, it is possible to increase the effective ultraviolet ray radiation amount, which is preferable.

Further, when the dry gas supply means for supplying the dry gas into the ultraviolet ray transmitting tube of the ultraviolet ray irradiating unit and the exhaust pipe line for exhausting the gas in the ultraviolet ray irradiating tube are provided, drying is performed in the ultraviolet ray irradiating unit. It is preferable because a gas can be made to flow therethrough to suppress dew condensation in the ultraviolet irradiation unit.

Further, the ultraviolet irradiation unit has a reflecting surface facing the plurality of ultraviolet lamps, is installed between the plurality of ultraviolet lamps in a direction along the extending direction of the ultraviolet lamps, and transmits the ultraviolet rays of the ultraviolet irradiation unit. The tube includes a tubular reflecting member having an opening located at one end thereof, and the tubular reflecting member at the other end of the ultraviolet ray transmitting tube is provided with an opening end located inside the opening of the tubular reflecting member. Supply means for supplying gas into the cylindrical reflecting member, and exhaust gas whose opening end is located on the other end side of the ultraviolet transmitting tube rather than the opening of the tubular reflecting member on the other end side of the ultraviolet transmitting tube. And a pipe. This allows the gas around the UV lamp to be exhausted,
Since the ozone generated in the ultraviolet irradiation unit by the irradiation of the ultraviolet rays can be eliminated, it is possible to prevent the ozone from oxidizing the reflecting surface of the reflecting member to cause clouding.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an ultraviolet irradiation apparatus to which the present invention is applied will be described below with reference to FIGS. 1 to 6. FIG. 1 is a side view showing a schematic configuration and operation of an ultraviolet irradiation device to which the present invention is applied. FIG. 2 is a plan view showing the schematic configuration and operation of the ultraviolet irradiation device to which the present invention is applied. FIG. 3 is a schematic diagram of an ultraviolet irradiation unit of an ultraviolet irradiation device to which the present invention is applied.
It is a sectional view taken along the line III-III. FIG. 4 is a cross-sectional view taken along line VI-VI of FIG. 1, showing a schematic configuration of the ultraviolet irradiation unit of the ultraviolet irradiation device to which the present invention is applied. FIG. 5 is a schematic diagram illustrating the state of ultraviolet rays emitted from the ultraviolet irradiation unit. FIG. 6 is a diagram showing an example of the distribution of the ultraviolet irradiance in one ultraviolet irradiation unit.

As shown in FIGS. 1 and 2, the ultraviolet irradiation device 1 of the present embodiment has an ultraviolet irradiation unit 3, a support frame 5 for supporting the ultraviolet irradiation unit 3, and an outside of the ultraviolet transmission tube 6 of the ultraviolet irradiation unit 3. A wiper 7 for wiping the surface, a motor 9 for driving the wiper 7, a rotary shaft 11 connected to the shaft of the motor 9, and the like are included.

The ultraviolet irradiation unit 3 is watertight by inserting a plurality of, for example, four straight-tube ultraviolet lamps 15 into an ultraviolet transmitting tube 6 made of a material that transmits ultraviolet rays, for example, quartz glass or Teflon (registered trademark). It is sealed in. As the straight-tube ultraviolet lamp 15, for example, a commercially available relatively inexpensive mass-produced product having a tube diameter of 15 mm is used.
The ultraviolet ray transmitting tube 6 of the ultraviolet ray irradiating unit 3 is in a state where one end portion is closed in a hemispherical shape and the other end portion is opened. The ultraviolet ray transmitting tube 6 has an inner diameter of 60 mm to 150 m with respect to four ultraviolet lamps 15 having a tube diameter of 15 mm.
m. A lower lamp support member having a semi-spherical closed end portion of the ultraviolet ray transmitting tube 6 formed in a hollow hemispherical shape, that is, a bowl shape, and having a socket 17 attached to the open portion of the bowl by a stay (not shown) or the like. 19 are installed. One base of the ultraviolet lamp 15 is inserted into the socket 17 of the lower lamp support member 19. The other base of the ultraviolet lamp 15 is, as shown in FIG. 1 and FIG.
It is inserted into a socket 17 fixed to an upper lamp supporting member 21 located on the open end side of the ultraviolet ray transmitting tube 6 constituting the ultraviolet ray irradiating unit 3.

The upper lamp support member 21 is a disk-shaped member formed of a material such as a metal or a synthetic resin that is not easily affected by ultraviolet rays, and has a U-shaped cutout from the circumference side toward the center. Four portions 22 are formed at equal intervals, and the sockets 17 are fixed to the respective cutout portions 22. The lower lamp support member 19 is also formed of a material such as a metal or a synthetic resin that is not easily affected by ultraviolet rays, and the lower lamp support member 19 has a socket 17 for the upper lamp support member 21.
The socket 17 is attached at a position corresponding to.
As described above, the ultraviolet lamp 15 includes the lower lamp supporting member 19 and the upper lamp supporting member 21 so that the ultraviolet light transmitting tube 6 is
It is supported inside and is arranged at equal intervals along the inner peripheral surface of the ultraviolet ray transmitting tube 6. In other words, the ultraviolet lamps 15 are arranged in the four corners of the square, and the ultraviolet transmission tubes 6
It is installed inside.

Four ultraviolet lamps 1 in the ultraviolet transmission tube 6
As shown in FIGS. 3 and 4, a tubular reflecting member 23 is installed in the middle of 5 along the axis of the ultraviolet ray transmitting tube 6. The tubular reflecting member 23 is formed of four curved side walls along the facing surface portions of the ultraviolet lamp 15, and the outer surfaces of the curved four side walls are reflecting surfaces 25. The reflecting member 23 is formed of anticorrosive material such as aluminum or stainless steel, and the reflecting surface 25 is mirror-finished by buffing or electrolytic polishing.

As shown in FIGS. 1 and 2, the opening end of the ultraviolet ray transmitting tube 6 which constitutes the ultraviolet ray irradiating unit 3 has a substantially disc-like shape made of a material such as a synthetic resin which is hardly affected by ultraviolet rays. The seal cap 27 is attached in a watertight manner. A dry gas pipeline 29 for supplying a dry gas, for example, dry air, into the ultraviolet irradiation unit 3 is watertightly inserted from the outer side to the inner side of the ultraviolet irradiation unit 3 in the central portion of the seal cap 27. As shown in FIG. 3, the dry gas pipeline 29 is also inserted through the center of the upper lamp support member 21, and the open end of the dry gas pipeline 29 is located inside the cylindrical reflecting member 23. ing. The dry gas pipeline 29 is connected to a blower, a cylinder or the like (not shown), and the dry gas pipeline 29 and the blower or cylinder (not shown) supply the dry gas into the ultraviolet irradiation unit 3. To form a dry gas supply means.

Further, as shown in FIGS. 1 and 2, an exhaust pipe line 30 for exhausting gas in the ultraviolet irradiation unit 3 is watertightly inserted from the outside to the inside of the ultraviolet irradiation unit 3 in the seal cap 27. There is. The opening end of the exhaust pipe line 30 has a seal cap 2 larger than that of the upper lamp support member 21.
It is located on side 7. In addition, the seal cap 27 includes
The wiring 31 from the socket 17 is watertightly inserted so that the wiring 31 is guided to the outside of the ultraviolet irradiation unit 3. The wiring 31 is connected to an ultraviolet lamp lighting means (not shown) including a ballast and a power source.

The support frame 5 is made of an anticorrosive material, for example, a metal such as stainless steel or aluminum, or a synthetic resin, and has a substantially flat pedestal portion 33 and a flat plate-shaped ultraviolet irradiation unit 3 on the seal cap 27 side. It is composed of a support plate 35 that supports the end portion of, and two support rods 37 that are provided between the pedestal portion 33 and the support plate 35. Base 3
On the upper surface of the ultraviolet irradiation unit 3, a support base 38 having a recess having a shape corresponding to the hemispherical end of the ultraviolet irradiation unit 3 is attached at a position corresponding to the installation position of the ultraviolet irradiation unit 3. Through holes having the same diameter as the outer diameter of the ultraviolet irradiation unit 3 are formed in the support plate 35 at positions corresponding to the installation positions of the ultraviolet irradiation unit 3.

The support frame 5 of this embodiment supports three ultraviolet irradiation units 3 and includes a support plate 35.
2, three through holes are formed at equal intervals so as to surround the center of the support plate 35, as shown in FIG. Then, on the pedestal portion 33, a support base 38 is installed at positions corresponding to the three through holes formed in the support plate 35. As shown in FIGS. 1 and 2, the ultraviolet irradiation unit 3 is inserted into the through hole of the support plate 35, and the hemispherical end of the ultraviolet irradiation unit 3 is inserted into the recess of the support base 38 of the pedestal 33. Therefore, it is supported by the support frame 5. The support rod 37 is installed outside the ultraviolet irradiation unit 3.

The motor 9 is attached to the center of the upper surface of the support plate 35. The rotary shaft 11 connected to the shaft of the motor 9 is inserted into a through hole formed at the center of the support plate 35, and the end of the rotary shaft 11 is rotated by a foot bearing 39 provided at the center of the pedestal part 33. It is supported freely. Although not shown, the outer surface of the rotating shaft 11 is threaded. The wiper 7 is made of an anticorrosive material or an anticorrosive material, such as stainless steel or Teflon, and has a tubular nut portion 4 that is screwed into the thread of the rotary shaft 11.
1, a ring-shaped portion 43 fixed to the nut portion 41 and having a hole having the same diameter as the outer diameter of the ultraviolet irradiation unit 3, and a tubular portion 4 fixed to the ring-shaped portion 43 and having the support rod 37 inserted therethrough.
5 and the like. In addition, the wiper 7 can integrally form the nut portion 41, the ring-shaped portion 43, the tubular portion 45, and the like, or the nut portion 41, the ring-shaped portion 43, and the tubular portion formed of different materials. It can also be formed by connecting 45 and the like.

The operation of the ultraviolet irradiating device 1 having such a configuration and the characteristic part of the present invention will be described. In the ultraviolet irradiation device 1 of the present embodiment, the pedestal portion 33 of the support frame 5 of the ultraviolet irradiation device 1 is placed on the bottom surface 47 of the flow path in the flow path through which the fluid to be processed, for example, the water to be processed flows. Installed in. Then, the ultraviolet irradiation unit 3 of the ultraviolet irradiation device 1
Is the ultraviolet irradiation unit 3 as shown in FIGS.
UV rays are irradiated to the water to be treated flowing in the direction intersecting the extending direction of the water.

At this time, the ultraviolet irradiation device 1 of this embodiment
However, as an alternative to one ultraviolet lamp, it has an ultraviolet irradiation unit 3 including four ultraviolet lamps. Therefore, the ultraviolet radiation density from one ultraviolet irradiation unit 3 depends on the radiant flux from the plurality of ultraviolet lamps 15 in the ultraviolet irradiation unit 3, so that the ultraviolet radiation from one straight-tube ultraviolet lamp is used. Will be higher than if radiated. Therefore, the range in which the necessary ultraviolet intensity is obtained by one ultraviolet irradiation unit 3 is widened, and the interval between the adjacent ultraviolet irradiation units 3 is
It can be made wider than the case where individual straight-tube ultraviolet lamps are provided.

Here, FIG. 5 schematically shows that the ultraviolet irradiance is increased by taking the ultraviolet irradiation unit 49 without the reflecting member 23 as an example. In FIG. 5, A
The ultraviolet rays from the four ultraviolet lamps 15 reach the point, and the ultraviolet rays from the two ultraviolet lamps 15 reach the point B. FIG. 6 exemplifies the irradiance distribution of ultraviolet rays of the ultraviolet irradiation unit 49 at this time. In addition, when the reflecting member is not provided, as shown by a broken line in FIG.
Adjacent ultraviolet lamps 15 in the ultraviolet irradiation unit 49
The ultraviolet rays radiated on the above are absorbed by the ultraviolet lamp 15 which is irradiated with the ultraviolet rays. Therefore, in the ultraviolet irradiation unit 3 of the present embodiment, as shown in FIGS. 3 and 4, the reflecting member 23 is installed inside, and when the reflecting member 23 is not installed like the ultraviolet irradiation unit 49. It is possible to reduce the ultraviolet rays that are mutually absorbed by the adjacent ultraviolet lamps 15 and increase the effective ultraviolet ray radiation amount emitted from the ultraviolet lamps 15.

By the way, since the ultraviolet irradiation unit 3 is immersed in the water to be treated, stains such as impurities such as microorganisms and organic substances in the water to be treated are deposited on the outer surface of the ultraviolet transmission tube 6 of the ultraviolet irradiation unit 3. In some cases, the adhered substances may reduce the irradiation amount of ultraviolet rays on the water to be treated. Therefore, the ultraviolet irradiation device 1 of the present embodiment is
A wiper 7 is provided. The wiper 7 is driven by the motor 9 when the required ultraviolet irradiance is no longer obtained or when a preset time has elapsed, whereby the rotary shaft 11 rotates and the rotary shaft 11 is screwed. The nut portion 41 of the wiper 7 which is fitted moves along the rotating shaft 11, and the ring-shaped portion 43 of the wiper 7 wipes the outer surface of the ultraviolet irradiation unit 3 along the extending direction of the ultraviolet irradiation unit 3. Moving. As a result, the dirt attached to the outer surface of the ultraviolet irradiation unit 3 is removed.

When such a wiper 7 is provided, the interval between the adjacent ultraviolet irradiation units 3 is limited by the wiper 7. In the case of this embodiment, in order to attach the wiper 7, the space between the ultraviolet irradiation units 3 is 4 to 5c.
It is necessary to open it more than m. For example, in a conventional ultraviolet irradiation device in which ultraviolet lamps each having a tube diameter of 15 mm are individually inserted in an ultraviolet ray transmitting tube, and the distance between adjacent ultraviolet ray transmitting tubes is increased by about 4 to 5 cm, the adjacent ultraviolet ray transmitting tubes are exposed. There is a region where the UV irradiance required for the water to be treated flowing between the pipes is not obtained. However, in the ultraviolet irradiation unit 3 of the ultraviolet irradiation device 1 of the present embodiment, the range in which the necessary ultraviolet intensity can be obtained can be widened,
Even if the water is installed at intervals of about 4 to 5 cm, the water to be treated flowing between the adjacent ultraviolet irradiation units 3 can receive the amount of ultraviolet rays required for treatment regardless of the position where the ultraviolet rays are passed. .

Further, in the ultraviolet irradiation device 1 of this embodiment, while the ultraviolet irradiation unit 3 emits ultraviolet rays,
A dry gas, such as dry air, is supplied into the ultraviolet irradiation unit 3 by a dry gas supply means. The dry gas that has flowed into the ultraviolet irradiation unit 3 through the dry gas conduit 29 flows downward in the cylindrical reflecting member 23 as indicated by the dashed arrow in FIG. Flow into the closed end of the UV irradiation unit 3 and make a U-turn in the lower lamp support member 19 having a hollow hemispherical portion provided at the closed end of the hemispherical portion of the ultraviolet irradiation unit 3, and this time it is reflected. It rises outside the member 23, that is, around the ultraviolet lamp 15. With this flow of dry gas,
Ozone generated when the air in the ultraviolet irradiation unit 3 is irradiated with ultraviolet rays from the ultraviolet lamp 15 can be discharged and removed through the exhaust pipe line 30. UV lamp 1
Even when an ozoneless lamp is used as 5, a trace amount of ozone is generated. When ozone is present in the ultraviolet irradiation unit 3, the ozone causes the reflecting surface 25 of the reflecting member 23 to become cloudy. However, in the present embodiment, by flowing a dry gas into the ultraviolet irradiation unit 3, ozone is removed. Since it is discharged, the reflecting surface 25 of the reflecting member 23 is hard to be fogged. Further, since the dry air flows through the ultraviolet irradiation unit 3, dew condensation is unlikely to occur, and it is possible to prevent condensed water from accumulating at the bottom of the ultraviolet ray transmission tube 6 of the ultraviolet irradiation unit 3.

Thus, the ultraviolet irradiation device 1 of this embodiment
Then, the ultraviolet radiation density from one ultraviolet irradiation unit 3 corresponds to the radiation flux from the plurality of straight-tube ultraviolet lamps 15. Therefore, the ultraviolet radiation density from one ultraviolet irradiation unit 3 becomes higher than the ultraviolet radiation density from one straight-tube ultraviolet lamp. Therefore, the range in which the required ultraviolet intensity is obtained by one ultraviolet irradiation unit 3 is wider than that when one straight tubular ultraviolet lamp is individually installed. Can be wider than the case where one straight tube type ultraviolet lamp is individually installed. As a result, dust or the like is caught between the adjacent UV lamps, or the UV lamps cannot be arranged at a necessary interval due to the installation of the wiper, so that the fluid to be processed cannot receive the UV irradiation amount necessary for the processing. The condition is less likely to occur. Further, the ultraviolet irradiation unit 3 is formed by using, as an ultraviolet lamp, a straight tube type ultraviolet lamp 15 which does not require bending of the discharge tube in manufacturing and does not require a cooler or a relatively expensive ballast. Has been done. Therefore, the processing capacity can be improved while suppressing the device cost.

Further, since the ultraviolet irradiation unit 3 has the reflecting member 23, the ultraviolet rays mutually absorbed by the adjacent ultraviolet lamps 15 in the ultraviolet irradiation unit 3 are reduced, and the effective ultraviolet radiation of the ultraviolet lamp 15 is reduced. The amount can be increased.

In addition, in the ultraviolet irradiation device 1 of this embodiment, the ultraviolet irradiation unit 3 is provided with the dry gas supply means for supplying the dry gas, so that the ultraviolet irradiation unit 3
Condensation inside can be suppressed. Further, the dry gas in the ultraviolet irradiation unit 3 is guided into the cylindrical reflecting member 23 via the dry gas pipe 29, flows through the reflecting member 23, and then flows around the ultraviolet lamp 15. Exhaust line 3
Since it is discharged through 0, ozone generated in the ultraviolet irradiation unit 3 can be discharged.
It is possible to suppress the occurrence of fogging on the reflective surface 25 of the above. Therefore, it is possible to suppress a decrease in the ultraviolet radiation capability of the ultraviolet irradiation unit 3 due to the occurrence of fogging on the reflecting surface 25.
It should be noted that it is not necessary to use a dry gas when the only purpose is to remove ozone. Further, when the purpose is to suppress dew condensation, the flow path of the dry gas does not need to be the path as in the present embodiment.

In this embodiment, the ultraviolet irradiation unit 3 provided with the reflection member 23 is provided, but the ultraviolet irradiation unit 49 not provided with the reflection member 23 is provided as shown in FIGS. 5 and 6. It can also be configured. Whether or not the reflecting member 23 is provided is selected according to the range in which the required ultraviolet irradiation intensity can be obtained. Further, in the present embodiment, the reflecting surface 25 of the reflecting member 23 is formed as a curved surface along the outer circumference of the ultraviolet lamp 15, but the reflecting surface 25 may be a flat surface. Alternatively, the reflecting member may be formed in a cylindrical shape as shown in FIG. 7, and the reflecting surface 51 may be formed on the outer peripheral surface of the cylindrical reflecting member 53. When the reflecting surface 25 is a flat surface or an outer peripheral surface of a cylindrical reflecting member,
Although the cost can be reduced, if the reflecting surface is a curved surface like the reflecting surface 25 of the present embodiment, mutual absorption of ultraviolet rays by the ultraviolet lamp can be further reduced.

Further, in the present embodiment, the ultraviolet irradiation unit 3 includes four ultraviolet lamps 15, but the number of ultraviolet lamps can be appropriately selected according to the required ultraviolet irradiation amount and the like. Further, in the present embodiment, the inner diameter of the ultraviolet ray transmitting tube 6 is set to 60 mm to 150 mm, but the inner diameter of the ultraviolet ray transmitting tube 6 can be appropriately selected. However, in the case where the reflecting member is not provided, the larger the inner diameter, the smaller the mutual absorption of the ultraviolet lamps, but the larger the inner diameter, the lower the volumetric efficiency of the device. Therefore, the inner diameter of the ultraviolet ray transmitting tube is preferably 60 mm to 150 mm when four ultraviolet ray lamps having a diameter of 15 mm are installed.

Further, the present invention is not limited to the ultraviolet irradiation device having the constitution as in the present embodiment, but may be, for example, an ultraviolet irradiation device installed in a tank containing a fluid to be treated or an ultraviolet irradiation device not equipped with the wiper 7. It can be applied to ultraviolet irradiation devices of various configurations used for various purposes.

[0038]

According to the present invention, the processing capacity can be improved while suppressing the apparatus cost.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration and operation of an embodiment of an ultraviolet irradiation device to which the present invention is applied.

FIG. 2 is a plan view showing a schematic configuration and operation of an embodiment of an ultraviolet irradiation device to which the present invention is applied.

FIG. 3 is a diagram showing a schematic configuration of an ultraviolet irradiation unit in an embodiment of the ultraviolet irradiation device to which the present invention is applied.
FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a diagram showing a schematic configuration of an ultraviolet irradiation unit in an embodiment of the ultraviolet irradiation device to which the present invention is applied.
FIG. 6 is a sectional view taken along line VI-VI of FIG.

FIG. 5 is a schematic diagram illustrating a state of ultraviolet rays emitted from an ultraviolet irradiation unit.

FIG. 6 is a diagram showing an example of the distribution of ultraviolet irradiance in one ultraviolet irradiation unit.

FIG. 7 is a cross-sectional view showing a modified example of the reflection member of the ultraviolet irradiation device to which the present invention is applied.

[Explanation of symbols]

1 UV irradiation device 3 UV irradiation unit 5 Support frame 6 UV transmission tube 7 wiper 15 UV lamp

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G21K 5/00 G21K 5/00 Z (72) Inventor Kenichiro Exit 5-1, Ginza, Chuo-ku, Tokyo (72) Inventor, Koji Ishida 5-2-1, Ginza, Chuo-ku, Tokyo F-term in Chiyoda Corporation (reference) 3B116 AA46 BA15 BC01 CD21 4C058 AA20 BB06 CC04 KK02 KK13 KK22 KK27 KK28 KK46 4D037 AB03 AB18 BA18 4G075 AA02 AA37 BA05 BA06 BA10 CA33 DA02 EB01 EB21 EB32 EB33 EC12 FC04

Claims (5)

[Claims] 1. An ultraviolet irradiation device comprising an ultraviolet irradiation unit in which a plurality of straight-tube ultraviolet lamps are inserted into one ultraviolet transmission tube. 2. An ultraviolet irradiation unit in which a plurality of straight-tube ultraviolet lamps are inserted in one ultraviolet transmission tube, a support frame for supporting the plurality of ultraviolet irradiation units, and the ultraviolet light supported by the support frame. An ultraviolet irradiation device comprising: a wiper for wiping the outer surface of the ultraviolet transmission tube of the irradiation unit. 3. The ultraviolet irradiation unit has a reflection member having a reflection surface facing a surface portion of the ultraviolet lamp opposite to the surface of the ultraviolet ray transmitting tube side. Or the ultraviolet irradiation device according to 2. 4. The dry gas supply means for supplying a dry gas into the ultraviolet ray transmitting tube of the ultraviolet ray irradiating unit, and the exhaust pipe line for exhausting the gas in the ultraviolet ray transmitting tube are provided. The ultraviolet irradiation device according to any one of 3 above. 5. The ultraviolet irradiation unit has a reflection surface facing the plurality of ultraviolet lamps, is installed between the plurality of ultraviolet lamps in a direction along an extending direction of the ultraviolet lamps, and is irradiated with the ultraviolet rays. The unit includes a tubular reflecting member having an opening at one end of the ultraviolet ray transmitting tube,
Gas supply means for supplying gas into the tubular reflecting member through a dry air pipe line whose opening end is located in the opening of the tubular reflecting member on the other end side of the ultraviolet ray transmitting tube; An exhaust pipe line whose opening end is located on the other end side of the ultraviolet transmission tube with respect to the opening of the cylindrical reflecting member on the other end side of the ultraviolet transmission tube. The ultraviolet irradiation device according to claim 1 or 2.