JP7619561B2 - Ultraviolet irradiation equipment - Google Patents

Description

The present invention relates to an ultraviolet irradiation device that is installed in a waterway and is suitable for efficiently performing ultraviolet treatment (disinfection, sterilization, etc.) on the liquid to be treated that flows through the waterway.

Ultraviolet irradiation devices of the type installed in a waterway (e.g., an open waterway) through which the liquid to be treated flows have been known for some time, and examples of such devices are shown in the following Patent Documents 1 and 2. Conventionally known ultraviolet irradiation devices installed in waterways are mainly suitable for wastewater treatment, and not many are suitable for water purification treatment. For example, to make them suitable for water purification treatment, it is required to increase the efficiency of ultraviolet irradiation of the water to be treated, but this requires a high density of ultraviolet lamps, which tends to increase costs. In contrast, in pure water production facilities, it is also widely known to place ultraviolet lamps in a high-pressure-resistant closed container such as a stainless steel tank, and introduce pressurized liquid to be treated into the closed container to perform ultraviolet treatment (e.g., Patent Document 3 below). However, facilities using such high-pressure-resistant closed containers tend to be expensive.

Patent Publication No. 10-309568 Patent Publication No. 2001-29948 Patent Publication No. 2007-275825

The present invention aims to provide an ultraviolet irradiation device suitable for efficiently treating the liquid to be treated flowing through a water channel with ultraviolet light.

The ultraviolet irradiation device of the present invention comprises an irradiation assembly including a body having open top and bottom surfaces and closed sides, the inner surfaces of the sides being formed as reflective surfaces, and an ultraviolet lamp housed in a protective tube that is liquid-tight and ultraviolet-transparent and is arranged within the body, the irradiation assembly being arranged within a waterway through which the liquid to be treated flows , the waterway including an open waterway, a culvert, and a filtration basin or a reservoir having a flowing water outlet, and irradiating the ultraviolet light emitted by the ultraviolet lamp and the reflected light from the reflective surface onto the liquid to be treated passing through the body, with one of the openings on the top and bottom surfaces of the body serving as an inlet and the other as an outlet.

The irradiation assembly includes an ultraviolet lamp and a body that houses the ultraviolet lamp, and the body has an open top and bottom and a closed side. The irradiation assembly is arranged in a waterway including an open waterway, a culvert, and a filtration tank or a reservoir with a flow outlet, and is suitable for passing the liquid to be treated vertically through the body. In addition, the inner surface of the side of the body is formed as a reflective surface, so that the ultraviolet light emitted from the ultraviolet lamp housed therein is reflected inward by the reflective surface, thereby efficiently irradiating the liquid to be treated passing through the body. This makes it possible to save the number of ultraviolet lamps and/or power to be arranged in the body.

The ultraviolet irradiation device according to the present invention may further include a flow straightener surrounding the irradiation assembly, the flow straightener including an open inlet and an enclosing wall, and the irradiation assembly is surrounded by the enclosing wall of the flow straightener with one of the upper and lower surfaces of the body entering the flow straightener and the other facing the outside of the flow straightener, and the liquid to be treated that enters the inlet of the flow straightener is guided by the enclosing wall to enter one of the upper and lower surfaces of the body of the irradiation assembly and exit from the other. The flow straightener may further include an insertion port, and the body of the irradiation assembly may be inserted into the flow straightener through the insertion port, and the flow straightener may be attached to the irradiation assembly with one of the upper and lower surfaces of the body entering the flow straightener and the other facing the outside of the flow straightener through the insertion port.

This makes it possible to provide a unitized ultraviolet irradiation device in which a straightener is provided surrounding the irradiation assembly in addition to the body constituting the irradiation assembly, and the combination of the two (body and straightener) allows the liquid to be treated flowing through the waterway to effectively pass through the irradiation assembly. With such a unitized ultraviolet irradiation device including a straightener, the state (amount, speed, etc.) of the liquid to be treated introduced into the irradiation assembly can be made as uniform as possible, regardless of the waterway environment in which it is placed, by the specified straightening action of the straightener. Therefore, if the treatment performance of this ultraviolet irradiation device is specified by the lamp power and the physical structure of the unit, etc., it can be expected that the treatment performance that meets the given regulations can be exhibited as much as possible, regardless of the waterway environment in which it is placed.

In addition, such a unitized ultraviolet irradiation device allows one or more units to be arranged according to the size (width, etc.) of the waterway to be applied, so it can be efficiently applied to various in-waterway liquid treatment plants. In addition, by combining both the body and the flow straightener, an appropriate water intake and discharge arrangement structure can be assembled, and this ultraviolet irradiation device can be installed to adapt to various differences in waterway environments. In other words, the inlet part of the flow straightener surrounding the irradiation assembly can be appropriately arranged according to the water intake environment of the waterway to be applied. This means that while standardizing the irradiation assembly (i.e., standardizing the upper and lower surfaces of the body as openings so that the treated liquid passes up and down inside the body), the standardized irradiation assembly can be applied to any waterway environment. Therefore, not only can the treatment performance be improved and made more efficient, but standardization can also be expected to save costs.

According to a preferred embodiment, a tray for receiving sediment may be disposed at the bottom of the flow straightener. Such a tray helps to safely and quickly collect broken pieces in the unlikely event that an ultraviolet lamp in the irradiation assembly breaks.

1 is a perspective view illustrating an ultraviolet irradiating device according to an embodiment of the present invention; FIG. 2 is an enlarged perspective view showing an example of the arrangement of ultraviolet lamps arranged in the irradiation assembly of FIG. 1; FIG. 2 is a schematic perspective view of an example of a flow conditioner that can be combined with the irradiation assembly of FIG. 1 . 4 is a perspective view showing a state in which the irradiation assembly of FIG. 1 and the flow regulator of FIG. 3 are combined as an embodiment of an ultraviolet irradiation device according to the present invention; FIG. FIG. 2 is a partially cross-sectional side view illustrating a state in which the ultraviolet irradiation device according to the present invention is installed in a waterway. FIG. 6 is a partial cross-sectional side view showing a modification of FIG. 5 . FIG. 7 is a partial cross-sectional side view showing a modification of FIG. 6 . FIG. 13 is a perspective view showing a state in which a plurality of units, each of which is a combination of an irradiation assembly and a flow regulator, are arranged side by side, as another embodiment of the ultraviolet irradiation device according to the present invention. FIG. 13 is a partially exploded perspective view showing an embodiment in which a reflective surface of the illumination assembly is provided by a removable reflector. 10 is a partially sectional and partially enlarged perspective view showing an example of a U-shaped groove or slit provided in the side frame in the embodiment of FIG. 9 . FIG. 13 is a partially exploded perspective view showing another embodiment in which the reflective surface of the illumination assembly is configured to be removable; 12 is an enlarged exploded perspective view of an example of a multi-layer structure of a side of a fuselage of the illumination assembly in the embodiment of FIG. 11; FIG. 12 is an enlarged perspective view showing another example of the structure of the side of the fuselage of the irradiation assembly in the embodiment of FIG. 11 .

In FIG. 1, an ultraviolet irradiation device 1 according to an embodiment of the present invention includes an irradiation assembly 10. The irradiation assembly 10 includes a body 11 and one or more ultraviolet lamps 12 arranged in the body 11. The body 11 has an upper surface 11a and a lower surface 11b open, and all of the side surfaces 11c are closed, with the inner surface of the side surface 11c being formed as a reflective surface. In the illustrated example, the side surface 11c of the body 11 has a rectangular shape consisting of four flat surfaces. In such a rectangular body 11, since each of the four surfaces constituting the side surface 11c is a flat surface, the reflective surface formed on the inner surface of each flat surface can be advantageously formed by a simple flat reflector. However, the shape of the side surface 11c of the body 11 may be cylindrical, or may be any shape such as a polygonal shape having three or more sides.

As shown in FIG. 2, the ultraviolet lamp 12 is placed in the body 11 in a state where it is housed in a protective tube 13 that is liquid-tight and ultraviolet-transmitting. Note that FIG. 2 shows an example in which four ultraviolet lamps 12 are placed in the body 11 as a mere example, but the ultraviolet lamps 12 placed in the body 11 are not limited to this. As an example, the ultraviolet lamp 12 has a linear light-emitting tube, and the vertical (up-down) size of the reflective surface formed on the side surface 11c of the body 11 corresponds at least to the longitudinal length (light-emitting length) of the light-emitting tube of the ultraviolet lamp 12, so that the ultraviolet light emitted from the ultraviolet lamp 12 is reflected inward by the reflective surface. Note that if the vertical (up-down) size of the side surface 11c (i.e., the reflective surface) of the body 11 is made longer than the light-emitting length, there is a disadvantage that pressure loss increases, and conversely, if the size is made shorter than the light-emitting length, there is a disadvantage that irradiation performance decreases. Therefore, making the size approximately equal to the light-emitting length has the advantage of being able to avoid these disadvantages.

More specifically, as shown in FIG. 1, the irradiation assembly 10 is attached to a frame 14. The frame 14 has an upper frame 14a, a lower frame 14b, and four side frames 14c extending therebetween, and the four side frames 14c support the rectangular body 11 in a predetermined arrangement. The protective tube 13 housing the ultraviolet lamp 12 is supported at its upper and lower ends by the upper frame 14a and the lower frame 14b. As described above, in order to efficiently reflect the ultraviolet light emitted from the ultraviolet lamp 12 on the reflective surface, the arrangement between the ultraviolet lamp 12 in the protective tube 13 and the side surface 11c of the body 11 is determined so that they correspond appropriately. As a modified example of the support structure of the protective tube 13, the protective tube 13 may be supported at least at its upper end or lower end by the upper frame 14a or the lower frame 14b. The lower end of the protective tube 13 may be integrally sealed and formed with the same material as the glass material (ultraviolet light transmitting material) of the side surface, like a test tube. As another example, the bottom end of the protective tube 13 may be made of a material different from the glass material (ultraviolet light transmitting material) of the side surface, in which case the joint between the side surface and the bottom end (bottom surface) is kept liquid-tight by a packing or the like. The frame 14 may be made of a metal material that has rigidity and corrosion resistance, such as stainless steel. For convenience of illustration, each part of the frame 14, such as the side frame 14c, is drawn as a square bar or plate, but this is not limited to this and may be made of angle iron.

In addition, the body 11 has a flange 11d protruding horizontally around the opening of the upper surface 11a. This flange 11d can function as an attachment site for the flow straightener 20 as described later, and can also function as an attachment site when installing the irradiation assembly 10 in a waterway, or as a partition member for blocking or straightening, if necessary. The side frame 14c extends above the upper surface 11a of the body 11, and the upper frame 14a is located at the upper end of the side frame 14c. A control box 15 is attached on top of the upper frame 14a, and a device (not shown) that supplies power to the ultraviolet lamp 12 is stored in the control box 15. The upper end of the protective tube 13 leads into the control box 15, and the electrical wiring of the ultraviolet lamp 12 passes through the protective tube 13 and is connected to the device in the control box 15 that supplies the power. In this way, the control box 15 is located above the body 11. At least the portion of the control box 15 near the bottom is configured to be liquid-tight so that liquid will not enter the box 15 even if it comes into contact with the liquid being treated in the waterway.

The irradiation assembly 10 having the above-mentioned configuration is placed in a waterway through which the liquid to be treated flows. In detail, the irradiation assembly 10 is placed in the waterway in an upright state as shown in FIG. 1, and the liquid to be treated flowing through the waterway passes through the openings on the upper surface 11a and the lower surface 11b of the body 11 in the vertical direction (vertical direction). The liquid to be treated passing through the body 11 is irradiated with ultraviolet light emitted by the ultraviolet lamp 12 and reflected light from the reflective surface of the side surface 11c. As a result, the liquid to be treated is purified by the ultraviolet light, such as disinfecting and sterilizing. In this way, the arrangement in which the length direction of the ultraviolet lamp 12 in the irradiation assembly 10 forms the vertical direction (vertical direction) in the waterway can ensure ultraviolet irradiation over a wider range in the vertical direction (vertical direction) in the waterway, which is advantageous in that it can efficiently deal with changes in the depth of the liquid to be treated in the waterway. That is, for example, if the ultraviolet lamps are arranged so that their length direction forms a horizontal direction (lateral direction) in the waterway, in order to ensure ultraviolet irradiation over a wider range in the vertical direction (vertical direction) in the waterway in order to deal with the variation in the depth of the liquid to be treated in the waterway, it is necessary to arrange a large number of ultraviolet lamps in the vertical direction (vertical direction), which increases costs. However, if the ultraviolet lamps 12 in the irradiation assembly 10 are arranged so that their length direction forms the vertical direction (vertical direction) in the waterway as in this embodiment, there is no such disadvantage. In addition, by arranging the ultraviolet lamps 12 so that their length direction forms the vertical direction (vertical direction) in the waterway, it is possible to design the ultraviolet lamps 12 so that they can be replaced by inserting and removing the ultraviolet lamps 12 from the upper end of the protective tube 13 without removing the irradiation assembly 10 and the flow straightener 20 from the waterway, which makes it easier to replace the lamps. In addition, by arranging the ultraviolet lamps 12 so that their length direction forms the vertical direction (vertical direction) in the waterway, the risk of water leakage at the upper part of the protective tube 13 can be reduced. In particular, if the protective tube 13 is shaped like a test tube, with its bottom end sealed and integrally formed with the side, the possibility of water leakage at the bottom of the protective tube 13 is nearly zero, and there is a possibility of water leakage only at the top. However, since the water pressure at the top is low, the overall risk of water leakage is significantly lower.

When the liquid to be treated flowing through the waterway is wastewater, dirt will frequently adhere to the reflective surface of the side 11c of the body 11. In order to remove dirt adhering to the reflective surface, it is desirable to properly (for example, frequently) clean the reflective surface of the side 11c. On the other hand, when the liquid to be treated flowing through the waterway is not wastewater, that is, when the ultraviolet irradiation device 1 according to the present invention is applied to water purification treatment, dirt will not frequently adhere to the reflective surface of the side 11c of the body 11. Therefore, the reflective surface of the side 11c may be cleaned less frequently or may be maintenance-free. Therefore, the ultraviolet irradiation device 1 according to the present invention is more suitable for application to a waterway for water purification treatment. However, it goes without saying that the ultraviolet irradiation device 1 according to the present invention can be applied to liquid treatment for any other purpose.

In order to efficiently pass the treated liquid up and down (vertical direction) in the irradiation assembly 10 arranged in the waterway, it is preferable to provide an appropriate water flow adjustment or straightening means (e.g., a weir, a partition, etc.) in the waterway. Depending on how such water flow adjustment or straightening means is installed in the waterway, it is possible to set the flow of the treated liquid passing through the body 11 either upward or downward. Specifically, to set the flow of the treated liquid upward, a weir and/or a partition, etc. may be installed so that the treated liquid arriving from the upstream of the waterway enters from an opening on the lower surface 11b of the body 11, and conversely, to set the flow of the treated liquid downward, a weir and/or a partition, etc. may be installed so that the treated liquid arriving from the upstream of the waterway enters from an opening on the upper surface 11a of the body 11. In the following, it is assumed that the flow of the liquid to be treated passing through the body 11 is set to be upward (i.e., the opening on the upper surface 11a is the outlet, and the opening on the lower surface 11b is the inlet). Note that the flow of the liquid to be treated from upstream to downstream in the waterway can be generated by an appropriate height difference, so it is possible to operate the ultraviolet irradiation device 1 according to the present invention without using a special pump.

In addition, in order to efficiently pass the liquid to be treated in the vertical direction (vertical direction) within the irradiation assembly 10, it is preferable to combine a flow straightener 20 as shown in Figure 3 with the irradiation assembly 10. The flow straightener 20 includes an open inlet portion 21 and an enclosing wall structure (23 and 24), and is configured so that, with one of the upper surface 11a or the lower surface 11b of the body 11 entering the flow straightener 20 and the other facing the outside of the flow straightener 20, the enclosing wall structure (23 and 24) of the flow straightener 20 surrounds the irradiation assembly 10, and the liquid to be treated that enters from the inlet portion 21 of the flow straightener 20 is guided by the enclosing wall structure (23 and 24) to enter one (inlet) of the upper surface 11a or the lower surface 11b within the body 11 of the irradiation assembly 10 and exit from the other (outlet). As an example, the flow straightener 20 further includes an insertion port 22, and the body 11 of the irradiation assembly 10 is inserted into the flow straightener 20 through the insertion port 22, and the flow straightener 20 is attached to the irradiation assembly 10 with the body 11 entering one of the upper surface 11a or the lower surface 11b of the body 11 (the inlet) and the other surface (the outlet) facing outside the flow straightener 20 through the insertion port 22.

In the example of FIG. 3, the flow straightener 20 has a square shape of a size that can loosely accommodate the body 11 and lower frame 11b of the irradiation assembly 10, with an inlet 21 formed on one side, the other three sides being wall surfaces 23, and an insertion port 22 formed on the upper part. A tray 24 is also provided on the bottom (lower surface) of the flow straightener 20. The tray 24 may be configured to be removable if necessary, but is usually fixed to the bottom (lower surface) of the flow straightener 20 to close the bottom (lower surface). The three wall surfaces 23 and the tray 24 on the bottom (lower surface) form an enclosed wall structure for the flow straightener 20. A flange 25 protruding horizontally is provided around the insertion port 22 on the upper part of the flow straightener 20. The inner width (inner diameter) of this flange 25 is smaller than the outer width (outer diameter) of the flange 11d of the body 11, and the outer width (outer diameter) of the flange 25 is larger than the outer width (outer diameter) of the flange 11d of the body 11. The flange 25 of the flow straightener 20 can function as an attachment part when installing the ultraviolet irradiation device 1, which is a combination of the irradiation assembly 10 and the flow straightener 20, in a waterway, or as a partition member for blocking or straightening.

4 is a perspective view showing a state where the irradiation assembly 10 of FIG. 1 and the flow straightener 20 of FIG. 3 are combined. As shown in this figure, according to one embodiment of the present invention, the ultraviolet irradiation device 1 can be provided as a unit formed by combining the irradiation assembly 10 and the flow straightener 20. When assembling, the irradiation assembly 10 of FIG. 1 is inserted into the flow straightener 20 with the lower frame 11b facing down through the insertion port 22 of the flow straightener 20 until the flange 11d of the irradiation assembly 10 is received by the flange 25 of the flow straightener 20 as shown in FIG. 4. In this state, the flange 11d of the irradiation assembly 10 is fixed to the flange 25 of the flow straightener 20 by an appropriate fixing means such as a screw. In this way, the irradiation assembly 10 and the flow straightener 20 are assembled as an integrated unit. In this assembled state, the inlet opening (lower surface 11b in the illustrated example) of the body 11 enters the flow straightener 20, and the outlet opening (upper surface 11a in the illustrated example) faces the outside of the flow straightener 20 via the insertion port 22, and the insertion port 22 of the flow straightener 20 closes the gap between the flow straightener 20 and the body 11 inside it. That is, the flange 11d provided on the upper surface 11a of the irradiation assembly 10 functions as a structure that closes the gap between the flow straightener 20 and the body 11. In this way, the treated liquid (untreated liquid) that has not passed through the inside of the body 11 does not leak out from the gap at the insertion port 22 of the flow straightener 20. With this type of closure structure, the liquid to be treated that is taken in through the inlet 21 provided on one side of the flow regulator 20 enters the body 11 through an opening on the lower surface 11b of the body 11 (i.e., the opening on the inlet side), passes upward through the body 11, and is discharged from an opening on the upper surface 11a (i.e., the opening on the outlet side).

The tray 24 provided at the bottom of the flow straightener 20 functions to receive any sediment. In the unlikely event that the ultraviolet lamp 12 or protective tube 13 in the irradiation assembly 10 is damaged, the tray 24 receives the broken pieces, preventing them from scattering into the waterway. During maintenance, the irradiation assembly 10 and flow straightener 20 unit can be pulled out of the waterway, and any broken pieces or other sediment from within the tray 24 can be collected.

It is preferable to appropriately determine the gap distance between the outer periphery of the body 11 of the irradiation assembly 10 housed in the flow straightener 20 and the wall surface 23 of the flow straightener 11, and the depth of the tray 24 (i.e., the distance from the lower surface 11b of the body 11 to the bottom (closed surface) of the tray 24) while taking into consideration the condition that the head loss is small.

5 is a partially sectional side view showing the state in which the ultraviolet irradiation device 1 according to this embodiment is installed in the waterway 30. The waterway 30 in which the ultraviolet irradiation device 1 is installed is separated from the treated waterway 40 that receives the treated liquid via a partition wall 41. An installation base 32 extending horizontally at a predetermined height in the waterway 30 is fixed to the partition wall 41. The installation base 32 has an opening 32a that matches the lateral size of the wall surface 23 of the flow straightener 20. The size of the opening 32a is smaller than the outer width (outer diameter) of the flange 25, so that the wall surface 23 of the flow straightener 20 can pass through the opening 32a, but the flange 25 is engaged by the installation base 32. When installing, the unit consisting of the combination of the irradiation assembly 10 and the flow straightener 20 is inserted into the opening 32a of the installation base 32 with the tray 24 facing down, and is inserted until the flange 25 of the flow straightener 20 is received by the installation base 32 as shown in FIG. In this state, the unit can be stably placed on the installation base 32 by its own weight (i.e., by its own weight that resists buoyancy). Of course, if necessary, the flange 25 of the unit can be fixed or semi-fixed to the installation base 32 using appropriate mounting members such as bolts and nuts.

As an example, the installation base 32 has a generally rectangular plane, and a weir 31 is formed vertically upward from one side 32b of the installation base 32 near the partition wall 41. As an example, the weir 31 may be a fixed weir with a given height h1. On the other side 32c of the installation base 32, a partition wall 33 is formed vertically upward. In the figure, only the partition wall 33 rising from the one side 32c is drawn, but similar partition walls are formed on the remaining two sides. As a result, when a unit consisting of a combination of the irradiation assembly 10 and the flow straightener 20 is fixed to the installation base 32 as shown in FIG. 5, a downstream space 34 is formed on the outlet side of the irradiation assembly 10 (the upper surface 11a of the body 11, i.e., the insertion port 22 of the flow straightener 20) side, which is liquid-tightly partitioned by the weir 31, the partition walls 33 on three sides, and the mounting base 32 at the bottom. The treated liquid discharged from the outlet of the irradiation assembly 10 flows out into this downstream space 34. The height of the partition wall 33 and the liquid level in the upstream space of the waterway 30 (space other than the downstream space 34) are higher than the given height h1 of the weir 31 (fixed weir). Therefore, the treated liquid that flows out from the upstream space through the irradiation assembly 10 into the downstream space 34 due to the difference in height flows from the downstream space 34 over the weir 31 and into the treated waterway 40. Of course, the height of the partition walls (41, etc.) in the waterway 30 other than the weir 31 is higher than the height h1 of the weir 31, for example, about the same height as the partition wall 33.

With this installation structure, the liquid to be treated present in the upstream space of the water channel 30 enters the unit from the inlet 21 of the flow straightener 20 due to the difference in liquid level between the upstream space and the downstream space 34, passes upward through the irradiation assembly 10 in the direction of arrow A, undergoes ultraviolet irradiation treatment, and reaches the downstream space 34 from the upper outlet. The treated liquid in the downstream space 34 then overflows from the weir 31 and enters the treated water channel 40.

The waterway 30 in which the ultraviolet irradiation device 1 is installed may be an open waterway type with its upper part exposed (open) to the external environment, or may be a culvert type with all or at least a part of its upper part closed by a lid or ceiling wall. The open waterway type waterway 30 may be a channel-shaped water flow path, or a filtration pond or a reservoir with a flow outlet. When the waterway 30 is a filtration pond or a reservoir, it is preferable to install the ultraviolet irradiation device 1 according to this embodiment near the flow outlet. Similarly, the treated waterway 40 may be an open waterway type or a culvert type. The culvert type treated waterway 40 may also be a pressure culvert configured to have a lifting pump installed at an appropriate drainage basin location and to send treated water downstream.

The difference between the liquid level h0 of the liquid in the water channel 30 before entering the ultraviolet irradiation device 1 according to this embodiment and the height h1 of the weir 31 provided in the downstream space 34 indicates the head loss. When designing the specific specifications of the ultraviolet irradiation device 1 according to this embodiment, various conditions including the head loss may be appropriately set and designed. As an example, the liquid to be treated is allowed to flow naturally down the water channel 30 without the assistance of a pump, the head loss is set to 200 mm or less, four ultraviolet lamps 12 consisting of low-pressure lamps with a performance of 1 kW are installed in the irradiation assembly 10, and an ultraviolet irradiation device 1 capable of treating 40,000 ^m3 of the liquid to be treated per day per unit can be designed, and it has been confirmed that appropriate treatment performance can be obtained with such specifications.

As an example, the given height h1 of the weir 31 is determined to be moderately higher than the height h2 of the bottom surface of the control box 15. This allows the lower part of the control box 15 to be constantly immersed in the liquid to be treated in the downstream space 34, preventing the lower part of the control box 15 from being exposed to air. When performing water purification treatment, the liquid to be treated is often disinfected by chlorine on the upstream side of the waterway 30. In such a case, the liquid to be treated that has reached the downstream space 34 contains chlorine components, and chlorine gas is emitted into the air from the surface of the liquid to be treated in the downstream space 34. As a general specification, the lower surface of the control box 15 is covered with stainless steel for rust prevention, and various parts related to the lower irradiation assembly 10 (such as parts that stop the protective tube 13 and a cleaning plate that cleans the surface of the protective tube 13) may be made of stainless steel. In this case, if the lower part of the control box 15 is not in contact with the liquid being treated, the lower part of the control box 15 is exposed to chlorine gas emitted into the air from the surface of the liquid being treated, and even if these parts are made of stainless steel, the chlorine gas will cause rust on these parts. However, according to this embodiment, by setting the fixed height (or minimum height) h1 of the weir 31 so that the lower part of the control box 15 can always be immersed in the liquid being treated in the downstream space 34, it is possible to prevent the stainless steel parts from being exposed to chlorine gas emitted into the air, thereby preventing the above-mentioned inconvenience.

Figure 6 is a partial cross-sectional side view showing a modified example of Figure 5. Figure 6 differs from Figure 5 in that the weir 31 includes a movable weir 35 whose height is adjustable, and the rest may be the same as that of Figure 5. The movable weir 35 is height adjustable stepwise or continuously to a height equal to or greater than the given height h1, and is provided over the entire area (width) of the weir 31. In the figure, the dotted line 35' shows the state in which the movable weir 35 is set to the maximum height, which is, for example, approximately the same as the height of the partition wall 33. The minimum height of the movable weir 35 may be the same as the height h1 of the fixed weir 31 or appropriately lower than that. In other words, by providing the movable weir 35, the weir 31 is height adjustable in the range from the minimum height h1 to the maximum height (the height of the dotted line 35'). By setting the height of the movable weir 35 appropriately higher than the height h1 of the weir 31, the overflow height of the treated liquid overflowing from the downstream space 34 into the treated waterway 40 can be appropriately adjusted. This allows the head loss to be appropriately adjusted. In addition, when the ultraviolet treatment function of the ultraviolet irradiation device 1 according to this embodiment is stopped, such as when performing maintenance on the ultraviolet irradiation device 1, the movable weir 35 can be set to the maximum height (the height of the dotted line 35') to prevent the liquid in the downstream space 34 (i.e., the untreated liquid) from overflowing into the treated waterway 40. For example, when the unit consisting of the combination of the irradiation assembly 10 and the flow straightener 20 is pulled up during maintenance, the untreated liquid will enter the downstream space 34 from the opening 32a of the installation base 32, but by setting the movable weir 35 to the maximum height (dotted line 35'), the untreated liquid can be prevented from overflowing from the downstream space 34 into the treated waterway 40.

7 is a partial cross-sectional side view showing a modified example of FIG. 6. In FIG. 7, the difference from FIG. 6 is that an adjustable drain section (50, 51) for draining the liquid in the downstream space 34 is provided, and the other configurations may be the same as those in FIG. 6. As an example, the drain section is composed of an outlet 50 and a drainage channel 51 connected to the outlet 50. For example, the drainage channel 51 is provided on the opposite side of the downstream space 34 across the partition wall 33, and an adjustable outlet 50 is provided at a location near the bottom surface of the downstream space 34 in the partition wall 33. The outlet 50 is, for example, a shutoff valve, and is normally closed, and is opened when it is necessary to drain the liquid in the downstream space 34 to the drainage channel 51. For example, when the ultraviolet irradiation device 1 according to this embodiment is started (when the operation starts), the outlet 50 is opened, and the liquid in the downstream space 34 is drained to the drainage channel 51 through the outlet 50. Before the ultraviolet irradiation device 1 is started, the downstream space 34 is filled with untreated liquid, and by discharging the untreated liquid through the outlet 50 to the drainage channel 51, the untreated liquid accumulated in the downstream space 34 can be prevented from flowing into the treated water channel 40 at the start of operation. For example, the ultraviolet irradiation process by the ultraviolet irradiation device 1 is started at the same time as the outlet 50 is opened, and the liquid in the downstream space 34 is gradually replaced by the treated liquid as the untreated liquid is discharged through the outlet 50 to the drainage channel 51. After an appropriate time has elapsed when the replacement with the treated liquid is considered to be almost complete, the outlet 50 is closed, and the ultraviolet irradiation process is continued thereafter. The drainage channel 51 may be any type of water channel, such as an open water channel, a culvert water channel, or a pipe water channel. In addition, the drainage channel 51 may be discharged to return (recover) the untreated liquid to the water channel 30, or may be discharged to a drainage system (e.g., public sewer) outside the system of the ultraviolet irradiation device 1 according to this embodiment. Of course, the example of FIG. 5 can also be provided with a drain section (discharge port 50 and drainage channel 51) as shown in FIG. 7.

Figure 8 is a perspective view showing a state where a plurality of units 61-65, each of which is a combination of an irradiation assembly and a flow straightener, are arranged side by side as another embodiment of the ultraviolet irradiation device 1 according to the present invention. Each unit 61-65 is a combination of an irradiation assembly 10 and a flow straightener 20 as shown in Figure 4, and is arranged in the waterway 30 as shown in Figures 5-7, and is arranged closely side by side along the weir 31. As described with reference to Figure 5, on the downstream space 34 side of each unit 61-65 (irradiation assembly 10) arranged on the installation base 32, partition walls 33, 36, and 37 are provided at the locations (three sides) other than the weir 31, and the partition walls 33, 36, and 37 individually divide the downstream space 34 of each unit 61-65 (irradiation assembly 10). In detail, as shown in Figures 5 to 7, the downstream space 34 corresponding to one unit 61 (irradiation assembly 10) is divided by a partition wall 33 arranged parallel to the weir 31, two parallel partition walls 36 and 37 arranged perpendicular to the weir 31 and partition wall 33, and the weir 31 (movable weir 35). The downstream spaces 34 corresponding to the other units 62 to 65 (irradiation assemblies 10) are similarly divided by three partition walls and the weir 31 (movable weir 35). Note that the same partition wall (e.g. 37) may be shared between adjacent units as shown.

The movable weir 35 is provided so that the height of each of the individually partitioned downstream spaces 34 can be adjusted individually for each unit 61 to 65 (irradiation assembly 10). The height of each movable weir 35 corresponding to each unit 61 to 65 (irradiation assembly 10) is adjusted to a common height according to a predetermined head loss during operation (ultraviolet light treatment), for example, but during maintenance, only the movable weir 35 corresponding to the specific unit 61 to 65 (irradiation assembly 10) to be maintained may be adjusted to the maximum height (dotted line 35'). As another example, the units 61 to 65 (irradiation assembly 10) may be thinned out by temporarily stopping a specific unit during operation (ultraviolet light treatment), and in that case, the movable weir 35 of the specific unit to be temporarily stopped may be set to the maximum height (dotted line 35') to prevent overflow from the corresponding downstream space 34 to the treated waterway 40.

Each unit 61 to 65 (irradiation assembly 10) is provided with a drain section that can be adjusted to open and close in order to discharge the liquid in the individually partitioned downstream space 34. Each drain section includes an outlet 50 and a drainage channel 51 provided for each individually partitioned downstream space 34, and as described above, the outlet 50 is, for example, a shutoff valve. That is, for each unit 61 to 65 (irradiation assembly 10), the outlet 50 that can be adjusted to open and close is provided on the side of the partition wall 33 parallel to the weir 31, and each outlet 50 leads to the common drainage channel 51. When each outlet 50 is opened, the liquid discharged from the outlet 50 is discharged into the drainage channel 51. As described above, the outlet 50 corresponding to each unit 61 to 65 (irradiation assembly 10) is opened when the ultraviolet irradiation of the unit begins, thereby discharging the untreated liquid accumulated in the downstream space 34 corresponding to the unit into the drainage channel 51, and then is returned to a closed state. The opening and closing of the outlets 50 corresponding to each of the units 61 to 65 (irradiation assemblies 10) can be controlled simultaneously or individually as necessary. As described above, the drainage channel 51 may be any type of channel, such as an open channel, a culvert type channel, or a pipe type channel, and the drainage channel 51 may be discharged to the untreated liquid channel 30 (recovery), or may be discharged outside the system.

In addition, each of the units 61 to 65 arranged side by side as shown in Figure 8 is not limited to a specification including both the irradiation assembly 10 and the flow regulator 20 described above, but may also include at least the irradiation assembly 10.

The reflective surface formed on the inner surface of the side surface 11c of the body 11 is not limited to a specific material, shape, or structure, and the point is that the inner surface of the side surface 11c of the body 11 is configured to have ultraviolet ray reflection properties. Therefore, for example, if the material of the side surface 11c of the body 11 itself has ultraviolet ray reflection properties (for example, metals with light reflection properties such as aluminum or stainless steel, or synthetic resins with light reflection properties on the surface), special processing to form the reflective surface is not necessary, and the ultraviolet ray reflection properties of the material itself can be used as they are. On the other hand, if the material of the side surface 11c of the body 11 does not have ultraviolet ray reflection properties, the inner surface of the side surface 11c can be coated with fluororesin or polished to form an appropriate reflective surface. In addition, the ultraviolet ray reflectance of the reflective surface formed on the inner surface of the side surface 11c of the body 11 is not replaced even if it is high or low, and the point is that it is sufficient to provide at least appropriate reflective performance.

Furthermore, in order to make the inner surface of the side surface 11c of the body 11 function as a reflective surface, it is preferable to perform conscious management and maintenance of the inner surface of the side surface 11c (i.e., the reflective surface). For example, the inner surface of the side surface 11c of the body 11 can be cleaned periodically or intermittently to remove dirt and thereby maintain its function as a reflective surface. Furthermore, the reflected light from the inner surface of the side surface 11c (i.e., the reflective surface) can be constantly or occasionally monitored by a sensor, and cleaning can be performed as necessary based on the monitoring results so as to maintain its function as a reflective surface. More preferably, an automatic cleaning mechanism can be disposed near the bottom surface of the control box 15, and when the inner surface of the side surface 11c of the body 11 needs to be cleaned, the automatic cleaning mechanism can be operated to automatically clean the reflective surface. Of course, this is not limited to this, and cleaning of the reflective surface can also be performed manually during maintenance work. As is clear from the above, in the present invention, the reflective surface formed on the inner surface of the side surface 11c of the body 11 is based on a technical concept intended to reuse the ultraviolet light reflected therefrom in the treatment of the liquid to be treated.

In one embodiment, the reflective surface formed on the inner surface of the side surface 11c of the body 11 of the irradiation assembly 10 may have a detachable structure. FIG. 9 is a partially exploded perspective view showing an example of forming a reflective surface by a detachable reflector 11e. For convenience, only one reflector 11e arranged on one inner surface of the side surface 11c of the body 11 is shown in an exploded view, but similar reflectors 11e are arranged on the other three inner surfaces of the side surface 11c. In addition, in FIG. 9, for convenience, the ultraviolet lamp 12, the protective tube 13, and the control box 15 are omitted from the illustration. At appropriate positions of the four side frames 14c supporting the four inner corners of the body 11, U-shaped grooves 14d (FIG. 10) or slits or other edge stoppers are provided to hold the side edges of the reflector 11e. As an example, when the reflector 11e is attached to the inner surface of the side surface 11c of the body 11, the reflector 11e is inserted into the body 11 by sliding it from above in the direction of the arrow in the figure. With this insertion, the reflector 11e is in a state where it can be locked by the U-shaped groove 14d (FIG. 10), slits, edge stopper members, etc., and when it is inserted to a predetermined position, the downward movement of the reflector 11e in the figure is stopped by an appropriate lower stopper structure (not shown). In this way, when the reflector 11e is stopped at a predetermined position inside the body 11, the reflector 11e functions as a reflective surface on the inner surface of the side surface 11c of the body 11. Note that FIG. 10 is a partially enlarged perspective view partially showing, in cross section and enlarged, one configuration example of the U-shaped groove 14d, slits, edge stopper members, etc. installed on the side frame 14c. In addition, when the reflector 11e is stopped at a predetermined position inside the body 11, an appropriate stopper member (not shown) or fasteners such as screws (not shown) may be applied to prevent the reflector 11e from wobbling upward. When removing the reflector 11e from the body 11, the reflector 11e can be pulled out upward in the opposite manner to the above (after removing the stopper member or fasteners such as screws as necessary). In addition, the reflector 11e is not limited to a flat surface shape as shown in the figure, and may also be a curved surface shape.

In the example of FIG. 9, the flat reflector 11e may have ultraviolet light reflecting performance on only one side (front side), or on both sides (front side and back side). When both sides of the reflector 11e have reflecting performance, if the reflecting performance of the first side (front side) deteriorates, the side to be used as the reflecting surface can be turned over and reattached to the body 11 to switch to the other side (back side). This can reduce the frequency with which the reflector 11e needs to be replaced with another one.

Figure 11 is a partially exploded perspective view showing another embodiment in which the reflecting surface formed on the inner surface of the side surface 11c of the body 11 of the irradiation assembly 10 is configured to be removable. In this embodiment, the body 11 has a rectangular shape with four side surfaces 11c, and each of the entire side surfaces 11c is removable from the side frame 14c via mounting members (not shown) such as bolts and nuts.

An example of the configuration of one side surface 11c, which is generally flat, is shown in an enlarged exploded perspective view in FIG. 12, and has a multi-layer structure in which, from the inside, a frame-shaped packing 11c1, a reflecting plate 11c2, a flat packing 11c3, and an outer plate 11c4 are arranged in this order. As shown in the figure, the frame-shaped packing 11c1 is a packing formed along the periphery of the side surface 11c, and the inside of the periphery is an opening 70. The frame-shaped packing 11c1 ensures liquid-tightness of the periphery of the inner surface of the side surface 11c. The reflecting plate 11c2 is a plate having a reflective surface with ultraviolet ray reflection performance as described above, and only one surface (front surface or inner surface) facing the opening 70 of the frame-shaped packing 11c1 may have ultraviolet ray reflection performance, or both surfaces (front surface and back surface, or inner surface and outer surface) may have reflection performance. The flat packing 11c3 is a packing whose entire surface is liquid-tight, thereby ensuring liquid-tightness of the entire back surface (or outer surface) of the reflector 11c2. The outer plate 11c4 is made of a relatively rigid or hard plate and functions to press the flat packing 11c3 from the outside. These parts 11c1 to 11c4 are stacked in layers and fixed to each other via fixing members (not shown) such as screws, to assemble one integral side surface 11c. The one integral side surface 11c thus assembled is attached to the left and right side frames 14c and the upper and lower horizontal frames 14e (FIG. 11) of the fuselage 11 via the mounting members (not shown) such as bolts and nuts, with the edge frame packing 11c1 at the innermost side (i.e., the outer plate 11c4 at the outermost side). With the side surface 11c attached to the body 11 in this manner, the surface (reflective surface) of the reflector 11c2 is exposed to the internal space of the body 11 through the opening 70 of the innermost edge frame packing 11c1, and thus the ultraviolet light emitted from the ultraviolet lamp 12 is reflected inward by the reflective surface of the reflector 11c2.

When removing the reflector 11c2, the bolts and nuts and other mounting members are released to remove the side 11c from the side frame 14c and the horizontal frame 14e (Fig. 11) of the body 11, and then the screws and other fixing members of the removed side 11c are released to disassemble it into each part 11c1 to 11c4, so that the reflector 11c2 can be removed. If both sides of the reflector 11c2 have ultraviolet ray reflection performance, the reflector 11c2 once removed can be turned over, and the parts 11c1 to 11c4 can be stacked in layers and fixed to each other via the screws and other fixing members to assemble one integral side 11c, and this side 11c can be attached to the body 11 again. In this way, by turning over the reflector 11c2, which has reflective surfaces on both sides, as described above, the frequency of replacing the reflector 11c2 with another one can be reduced.

In the example of FIG. 12, the edge frame packing 11c1 and the flat packing 11c3 ensure liquid tightness of the entire back surface (or outer surface) of the reflector 11c2. Therefore, the back surface (or outer surface) of the reflector 11c2 does not come into contact with the liquid to be treated (or the contact is minimized), so the possibility that the back surface (or outer surface) of the reflector 11c2 will be contaminated by the liquid to be treated can be minimized. This makes it possible to omit (or simplify) the cleaning work of the back surface (or outer surface) of the reflector 11c2, in other words the surface that will become the new front surface (or inner surface), when the reflector 11c2 is turned over and the side surface 11c is reattached to the body 11.

The frame-shaped packing 11c1 and the flat packing 11c3 may be made of a general packing material, such as rubber or a synthetic resin having a suitable elasticity. The outer plate 11c4 may be made of an appropriate metal or synthetic resin. As an example, an aluminum plate may be used as the reflector 11c2, and in that case, appropriate measures should be taken to prevent electrical contact between the aluminum and dissimilar metals. For example, the diameter of the bolt-through hole in the reflector 11c2 may be made large to prevent the aluminum reflector 11c2 from contacting the metal bolts used for mounting. Alternatively, non-metallic materials may be used as the mounting members such as the bolts and nuts and/or the fixing members such as the screws.

The flat packing 11c3 and the outer plate 11c4 also function to protect the back surface of the reflector 11c2. However, if the liquid-tight function and/or the protective function for the back surface of the reflector 11c2 are not required, the flat packing 11c3 and/or the outer plate 11c4 may be omitted. As another example, the flat packing 11c3 may be made of a Teflon (registered trademark) plate. Alternatively, the flat packing 11c3 may be omitted, and the inner surface of the outer plate 11c4 may be a Teflon (registered trademark) surface.

The left and right side frames 14c and the top and bottom horizontal frames 14e of the body 11 may be made of metal material to ensure rigidity. In this case, if the metal material is a non-aluminum metal and the reflector 11c2 is an aluminum metal, it is preferable to use a frame-shaped gasket 11c1 made of an insulating material such as rubber to prevent contact between the two. However, if it is not necessary for some reason, such as the frame 14 being made of aluminum, the frame-shaped gasket 11c1 may be omitted. In short, in order to configure the inner reflective surface of the side surface 11c of the body 11 of the irradiation assembly 10 to be removable, it is sufficient that the side surface 11c is configured to include at least the removable reflector 11c2.

13 shows another structural example of the side 11c of the body 11 of the irradiation assembly 10 in the embodiment of FIG. 11, where (a) is an enlarged perspective view showing the reflective surface (11c6) of the side 11c facing upward, and (b) is a further enlarged view of the cross section along the line B-B in (a). In the example of FIG. 13, one side 11c, which is generally flat, includes a frame structure 11c5 and a reflector 11c6 removably stored in the frame structure 11c5. The frame structure 11c5 includes a shallow box-shaped protective case 11c51 with one side open, and an edge frame member 11c52 that covers only the periphery of the open surface of the protective case 11c51. In other words, the edge frame member 11c52 consists only of a rectangular outer frame, and the inside is open. As shown in Fig. 13(b), the cushion material 11c7 is placed on the entire bottom surface of the protective case 11c51, the reflector 11c6 is placed on the cushion material 11c7, and the edge frame member 11c52 is placed so as to press the periphery of the reflector 11c6. A convex strip 11c61 is formed along the entire periphery of the reflector 11c6, and the inner periphery of the edge frame member 11c52 is smaller than the outer periphery of the convex strip 11c61, so that the convex strip 11c61 on the periphery of the reflector 11c6 stored in the protective case 11c51 is pressed by the edge frame member 11c52. With each part placed in this manner, the edge frame member 11c52 is fastened to the protective case 11c51 with a fixing member such as a screw (not shown), thereby assembling one integral side surface 11c. When the frame member 11c52 is attached to the protective case 11c51, the ridges 11c61 on the periphery of the reflector 11c6 are engaged by the frame member 11c52, thus fixing the reflector 11c6 to the protective case 11c51, and one surface of the reflector 11c6 is exposed from the inner opening of the frame member 11c52 (the opening surface of the protective case 11c51), which functions as a reflective surface. As shown in FIG. 13(a), a number of bolt holes TH for mounting are provided along the periphery of the frame structure 11c5, penetrating the frame member 11c52 and the protective case 11c51.

The single integrated side surface 11c thus assembled is attached to the left and right side frames 14c and the top and bottom horizontal frames 14e (FIG. 11) of the body 11 via attachment members (not shown) such as bolts and nuts, with the reflector 11c6 exposed from the edge frame member 11c52 (opening surface of the protective case 11c51) facing inward. With the side surface 11c attached to the body 11 in this manner, one surface (reflecting surface) of the reflector 11c6 exposed from the inner opening of the edge frame member 11c52 (opening surface of the protective case 11c51) is exposed to the internal space of the body 11, and thus the ultraviolet light emitted from the ultraviolet lamp 12 is reflected inward by the reflecting surface of the reflector 11c6.

When removing the reflector 11c6, the bolts and nuts and other mounting members are released to remove the side surface 11c from the side frame 14c and the horizontal frame 14e (FIG. 11) of the fuselage 11, and then the screws and other fixing members of the removed side surface 11c are released to remove the edge frame member 11c52, so that the reflector 11c6 can be removed from the protective case 11c51. If both sides of the reflector 11c6 have ultraviolet ray reflecting properties, the reflector 11c6 once removed in this manner is turned over and placed again in the protective case 11c51, the edge frame member 11c52 is placed on top of it, and the edge frame member 11c52 is fastened to the protective case 11c51 via the screws and other fixing members, thereby reassembling one integral side surface 11c, and this side surface 11c can be reattached to the fuselage 11. In this way, by inverting the reflector 11c6, which has reflective surfaces on both sides, as described above, the frequency with which the reflector 11c6 needs to be replaced with another one can be reduced.

As an example, the reflector 11c6 is made of aluminum, and the frame member 11c52 and the protective case 11c51 are also made of aluminum. Of course, this is not a limitation, and the reflector 11c6, frame member 11c52, and protective case 11c51 may all be made of any suitable material.

In the structure shown in FIG. 13, the reflector 11c6 is sandwiched between the frame member 11c52 of the frame structure 11c5 and the protective case 11c51, so there is no need to provide a bolt hole for mounting in the reflector 11c6 itself. In addition, the fixing members such as screws for fastening the frame member 11c52 to the protective case 11c51 can also be made not to come into contact with the reflector 11c6. Therefore, since the aluminum reflector 11c6 does not come into contact with the metals (non-aluminum metals such as stainless steel) of the mounting bolts and fastening screws, there is an advantage in that the aluminum reflector 11c6 does not suffer from the problem of electrical corrosion between aluminum and dissimilar metals. In other words, there is no risk of the reflective surface of the reflector 11c6 being deteriorated by electrical corrosion.

In other words, in the structure shown in FIG. 13, the frame member 11c52 and the protective case 11c51 (i.e., the protective member) of the frame structure 11c5 have a peripheral area PA (the area where the frame member 11c52 is in direct contact with the rising wall of the protective case 11c51 as shown in FIG. 13(b)) that does not overlap the reflector 11c6 when the reflector 11c6 is sandwiched, and are configured to be fixed to each other in the peripheral area PA via fixing members such as screws and/or bolts. In other words, in FIG. 13(a), the area where multiple bolt holes TH are provided is the peripheral area PA. With this structure, as described above, even if the fixing member is a non-aluminum metal, the aluminum reflector 11c6 does not deteriorate due to electrical corrosion.

12 and 13, when the side surface 11c is assembled, the surface (back surface) opposite the reflective surface (front surface) of the reflector 11c2 or 11c6 is protected by the outer plate 11c4 or protective case 11c51, so the back surface of the reflector 11c2 or 11c6 can be appropriately protected during the work of further assembling the side surface 11c to the fuselage 11. Therefore, the assembly worker does not need to be concerned about protecting the back surface of the reflector 11c2 or 11c6, making the work easier. In addition, when the body 11 or irradiation assembly 10 assembled at the factory is transported to the installation site, and when the ultraviolet irradiation device 1 is assembled on site, the reflector 11c2 or 11c6 is protected by the outer plate 11c4 or protective case 11c51 on the side 11c that faces the outside, so the worker does not need to worry about protecting the reflector 11c2 or 11c6, making transportation and/or assembly easier.

A feature of the structure shown in the embodiment of FIG. 12 or FIG. 13 can be summarized as follows. One side 11c includes a reflector 11c2 or 11c6 and a protective member (i.e., outer plate 11c4 or protective case 11c51) arranged to cover one surface of the reflector 11c2 or 11c6, and is configured so that the other surface of the reflector 11c2 or 11c6 functions as a reflective surface. This feature provides the above-mentioned advantages.

In addition, another feature of the structure shown in the embodiment of FIG. 12 or FIG. 13 can be summarized as follows. One side 11c includes a reflector 11c2 or 11c6, a protective member (i.e., outer plate 11c4 or protective case 11c51) arranged to cover one side of the reflector 11c2 or 11c6, and an edge frame member (i.e., edge frame-shaped packing 11c1 or edge frame member 11c52) arranged along the periphery of the reflector 11c2 or 11c6 on the opposite side of the protective member, and is configured to sandwich the reflector 11c2 or 11c6 between the edge frame member and the protective member, and the other surface of the reflector 11c2 or 11c6 exposed from the inner opening of the edge frame member functions as a reflective surface.

1 Ultraviolet irradiation device 10 Irradiation assembly 11 Body 11a Top surface (opening)
11b Bottom surface (opening)
11c Side (reflective surface)
11c1: Frame-shaped packing 11c2: Reflector plate 11c3: Flat packing 11c4: Outer plate 11c5: Frame structure 11c51: Protective case 11c52: Frame member 11c6: Reflector plate 11c61: Convex strip 11c7: Cushion material 11d: Flange 11e: Reflector plate 12: Ultraviolet lamp 13: Protective tube 14: Frame 14a: Upper frame 14b: Lower frame 14c: Side frame 14d: U-shaped groove (or slit)
14e Horizontal frame 15 Control box 20 Flow regulator 21 Inlet 22 Insertion port 23 Wall surface (side surrounding wall)
24 Saucer (bottom wall)
25 Flange 30 Waterway 31 Weir 32 Installation base 33, 36, 37 Partition wall 34 Downstream space 35 Moving weir 40 Treated waterway 41 Partition wall 50 Outlet 51 Drainage channel 61, 62, 63, 64, 65 Unit

Claims (19)

A body having an upper surface and a lower surface that are open and a side surface that is closed, and the inner surface of the side surface is formed as a reflecting surface;
an ultraviolet lamp disposed in the body in a state where the ultraviolet lamp is housed in a liquid-tight and ultraviolet-transmitting protective tube;
an illumination assembly including:
The irradiation assembly is an ultraviolet irradiation device characterized in that it is placed in a waterway through which the treated liquid flows, which waterway includes one of an open waterway, a culvert, and a filtration basin or a reservoir with a flowing water outlet , and one of the openings on the upper and lower surfaces of the body serves as an inlet and the other as an outlet, and irradiates the treated liquid passing through the body with ultraviolet light emitted by the ultraviolet lamp and reflected light from the reflective surface. The ultraviolet irradiation device of claim 1, wherein the body has a rectangular shape, the side surface is made up of a plurality of flat surfaces, and the reflecting surface formed on the inner surface of each flat surface is made up of a flat reflecting surface. The ultraviolet irradiation device of claim 1 or 2, wherein the reflective surface is formed by a removable reflector. The ultraviolet irradiation device of claim 3, characterized in that the reflector has a flat surface shape, both sides of which have reflective properties, and the surface to be used as the reflective surface can be switched. 5. The ultraviolet irradiation device according to claim 3, wherein the side surface includes the reflector and a protective member arranged to cover one surface of the reflector, and the other surface of the reflector functions as the reflecting surface. The ultraviolet irradiation device of claim 5, wherein the side includes the reflector, the protective member, and a frame member arranged along the periphery of the reflector on the opposite side of the protective member, the reflector is sandwiched between the frame member and the protective member, and the other surface of the reflector exposed from the inner opening of the frame member functions as the reflective surface. The ultraviolet irradiation device of claim 6, wherein the edge frame member and the protective member have peripheral regions that do not overlap the reflector plate when the reflector plate is sandwiched between them, and are configured to be fixed to each other in the peripheral regions via fixing members such as screws and/or bolts. a flow straightener surrounding the illumination assembly;
the straightener includes an open inlet and an enclosure wall, and the enclosure wall of the straightener surrounds the irradiation assembly with one of the upper surface and the lower surface of the body being inside the straightener and the other being outside the straightener;
8. An ultraviolet irradiation device according to any one of claims 1 to 7, wherein the liquid to be treated entering through the inlet portion of the flow straightener is guided by the surrounding wall so as to enter one of the upper or lower surfaces of the body of the irradiation assembly and exit from the other. The ultraviolet irradiation device of claim 8, wherein the flow straightener further includes an insertion port, and the body of the irradiation assembly is inserted into the flow straightener through the insertion port, and the flow straightener is attached to the irradiation assembly in a state where one of the upper surface or the lower surface of the body is inserted into the flow straightener and the other is exposed to the outside of the flow straightener through the insertion port. An ultraviolet irradiation device according to any one of claims 1 to 9, wherein a tray for receiving sediment is disposed at the bottom of the flow straightener or below the irradiation assembly. A control box is disposed above the body and contains a device for supplying power to the ultraviolet lamp;
An ultraviolet irradiation device according to any one of claims 1 to 10, further comprising a dam provided at a given height in a downstream space through which the treated liquid that has been treated in the irradiation assembly flows out, the given height of the dam being set higher than the bottom surface of the control box. The ultraviolet irradiation device of claim 11, wherein the dam includes a movable dam that is height adjustable, and the movable dam can be adjusted to a height equal to or greater than the given height. An ultraviolet irradiation device according to any one of claims 1 to 12, further comprising an adjustable drain section for discharging liquid from a downstream space into which the liquid to be treated flows after being treated in the irradiation assembly. A plurality of said illumination assemblies are disposed within said waterway;
providing a partition for each irradiation assembly to individually separate a downstream space into which the liquid to be treated flows after being treated by the irradiation assembly;
12. The ultraviolet irradiation device according to claim 1, further comprising a movable weir, the height of which is adjustable, provided in the downstream space corresponding to each irradiation assembly. The ultraviolet irradiation device of claim 14, wherein the movable weir is individually height adjustable in the downstream space corresponding to each irradiation assembly. The ultraviolet irradiation device of claim 14 or 15, wherein the downstream space corresponding to each irradiation assembly is provided with a drain section that can be adjusted to open or close in order to drain liquid from the downstream space. The ultraviolet irradiation device of claim 8 or 9, comprising a plurality of units each consisting of a combination of the irradiation assembly and the flow regulator, and the plurality of units are arranged in the water channel. The ultraviolet irradiation device of claim 17, wherein a tray for receiving sediment is disposed at the bottom of the flow regulator for each of the units. An ultraviolet irradiation device according to any one of claims 1 to 18, wherein the water channel is a water channel for water purification treatment.

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