Ultraviolet irradiation device

Abstract

To provide an ultraviolet irradiation device enabling easy replacement work of cyclic components.SOLUTION: An ultraviolet irradiation device is assembled with an ultraviolet light source, a protective pipe, a reaction tank, and a cleaning mechanism. The reaction tank has a pair of support parts arranged with a distance therebetween in an axial direction of the protective pipe, and supporting the protective pipe, and a housing part for housing the entire pair of protective pipes therein. The cleaning mechanism has, as a constituting element for cleaning an outer peripheral surface of the protective pipe, a first component supported by the support part and extending in the axial direction, a cyclic component inserted with an object component which is either the first component or the protective pipe, and cleans the outer peripheral surface by moves of the cyclic component. The cyclic component has a pair of end parts contacting with each other and is removable from the object component by alienating the pair of end parts. The reaction tank is provided with an opening enabling removal works of the cyclic component from the object component.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to an ultraviolet irradiation device. [Background technology]

[0002] In conventional disinfection facilities, chemicals such as ozone and chlorine are used for, for example, sterilizing or disinfecting water supply and sewage systems (tap water, groundwater, etc.), deodorizing, decolorizing, sterilizing or disinfecting industrial water, bleaching pulp, or sterilizing or disinfecting medical equipment. However, in such disinfection facilities, chemicals such as ozone and chlorine must be uniformly dissolved in the treated water, which requires a storage tank (retention tank) for storing the treated water to agitate the chemicals, and an agitation device such as a spray pump, making it difficult to immediately respond to changes in the quality or amount of the treated water.

[0003] To address these problems, there are ultraviolet irradiation devices that sterilize or disinfect water supply and sewerage systems or industrial water by irradiating them with ultraviolet light. These ultraviolet irradiation devices irradiate the treated water with ultraviolet light in the reaction tank while the water passes through the reaction tank, and can respond immediately to changes in the quality or quantity of the treated water.

[0004] This type of ultraviolet irradiation device includes an ultraviolet light source housed in a reaction vessel for irradiating ultraviolet light, a protective tube housed in the reaction vessel and housing the ultraviolet light source, and a cleaning mechanism housed in the reaction vessel for cleaning the outer surface of the protective tube. The cleaning mechanism cleans the outer surface of the protective tube with an annular cleaning member inside which the protective tube is placed. The reaction vessel has a pair of support parts arranged at intervals in the axial direction of the protective tube, supporting the protective tube, and a housing part spanning the pair of support parts and housing the protective tube inside. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 9-52093 Summary of the Invention [Problem to be solved by the invention]

[0006] In conventional technology, in order to replace an annular member such as a cleaning member into which other members have been inserted, it was necessary to remove the support part, which is a heavy object, from the storage part, making the work of replacing the annular member difficult. [Means for solving the problem]

[0007] An ultraviolet irradiation device according to an embodiment includes an ultraviolet light source, a protective tube, a reaction tank, and a cleaning mechanism. The ultraviolet light source irradiates ultraviolet light. The protective tube houses the ultraviolet light source. The reaction tank is arranged at intervals along the axial direction of the protective tube, and includes a pair of support sections supporting the protective tube and a housing section that houses the protective tube across the pair of support sections. The reaction tank is provided with a water inlet for supplying the target water to be treated and a drain outlet for draining the target water. The cleaning mechanism includes, as components for cleaning the outer surface of the protective tube, a first member supported by the support section and extending in the axial direction, and an annular member into which a target member, either the first member or the protective tube, is inserted. The cleaning mechanism cleans the outer surface by moving the annular member. The annular member has a pair of contacting ends and can be removed from the target member by separating the pair of ends. The reaction tank is provided with an opening that allows the annular member to be removed from the target member. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a flowchart showing an example of a treatment procedure of a water treatment system incorporating an ultraviolet irradiation facility according to the first embodiment. [Figure 2] FIG. 2 is a diagram for explaining the flow of filtered treated water in the ultraviolet irradiation equipment of the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view showing the ultraviolet irradiation device of the first embodiment. [Figure 4]FIG. 4 is an exploded perspective view showing a part of the ultraviolet irradiation device of the first embodiment. [Figure 5] FIG. 5 is a front view showing the cleaning member of the first embodiment. [Figure 6] FIG. 6 is a front view showing a cleaning member according to a modified example of the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing a part of the ultraviolet irradiation device of the second embodiment. [Figure 8] FIG. 8 is a cross-sectional view showing a part of the ultraviolet irradiation device of the second embodiment. [Figure 9] FIG. 9 is a front view showing a part of the linear motion unit of the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] An ultraviolet irradiation device according to an embodiment will be described below with reference to the drawings. Note that the following description does not limit the technology of the present disclosure. In addition, in the following description, the same components are given the same reference numerals, and duplicated descriptions will be omitted.

[0010] The drawings are schematic, and the dimensional relationships and ratios of elements may differ from reality. Furthermore, the drawings may include portions in which the dimensional relationships and ratios differ from one another.

[0011] First, an outline of the processing flow in a water treatment system incorporating the ultraviolet irradiation equipment 1 of the present embodiment will be described with reference to Fig. 1. Fig. 1 is a flowchart showing an example of the processing procedure of a water treatment system incorporating the ultraviolet irradiation equipment 1 of the first embodiment.

[0012] First, raw water is taken from a river, lake, or groundwater as treated water, and the taken treated water is introduced into a coagulation and sedimentation tank, where a coagulant is added to coagulate and settle suspended soil particles and the like (S1). Next, the supernatant water from the coagulation and sedimentation tank is sent to an activated carbon filtration tank to filter out foreign matter (S2), and the filtered treated water is sent to a reaction tank 10 (see Figure 3) of an ultraviolet irradiation device 4. The treated water is then passed through the reaction tank 10 and irradiated with ultraviolet (UV) light (S3). The treated water that has been sterilized, disinfected, or inactivated by UV irradiation is sent to a chlorine injection tank, where chlorine is injected (S4), and then distributed to homes, businesses, etc.

[0013] 2 is a diagram illustrating the flow of filtered treated water in ultraviolet irradiation equipment 1 of the first embodiment. The ultraviolet irradiation equipment 1 of this embodiment includes, for example, a flow meter 2 through which filtered treated water first flows, a strainer 3 disposed after the flow meter 2, an ultraviolet irradiation device 4 disposed after the strainer 3, a strainer 5 disposed after the ultraviolet irradiation device 4, and an emergency shutoff valve 6 disposed after the strainer 5.

[0014] As shown in Fig. 2, for example, two ultraviolet irradiation equipment 1 are installed side by side in a water treatment system so that they can back up each other, ensuring two lines of flow paths for treated water. Even if one of the two ultraviolet irradiation equipment 1 undergoes replacement or maintenance, or if a malfunction occurs, the other ultraviolet irradiation equipment 1 can continue to sterilize, disinfect, or inactivate the treated water. That is, in the example shown in Fig. 2, the treated water after filtering flows into the flow meters 2 of the two ultraviolet irradiation equipment 1 via branch pipes. Furthermore, the treated water after sterilization or other treatments in the respective ultraviolet irradiation equipment 1 is, for example, joined and then chlorine is injected.

[0015] 3 is a cross-sectional view showing the ultraviolet irradiation device 4 of the first embodiment. As shown in FIG. 3, the ultraviolet irradiation device 4 includes a reaction vessel 10, covers 11 and 12, an ultraviolet light source 13, a protective tube 14, and a cleaning mechanism 15.

[0016] The reaction vessel 10 accommodates therein an ultraviolet light source 13, at least a part of a protective tube 14, and at least a part of a cleaning mechanism 15. The reaction vessel 10 has an accommodating section 21 and a pair of support sections 22, 23.

[0017] The pair of support portions 22, 23 are spaced apart from each other in the axial direction (longitudinal direction) of the protective tube 14. The support portions 22, 23 are walls extending in a direction intersecting (for example, perpendicular to) the axial direction of the protective tube 14. The support portions 22, 23 support the protective tube 14. Specifically, the support portion 22 supports one end of the protective tube 14, and the support portion 23 supports the other end of the protective tube 14. The accommodation portion 21 is provided across the pair of support portions 22, 23. The accommodation portion 21 is formed in a cylindrical shape and accommodates the protective tube 14 therein. The accommodation portion 21 is also provided with a water inlet 24 for supplying the treatment water to be treated and a drain outlet 25 for draining the treatment water. The arrow W in FIG. 3 indicates the flow direction of the treatment water. In the reaction tank 10, treatment water to be sterilized, disinfected, or inactivated enters through the water inlet 24 and is drained through the drain outlet 25.

[0018] Furthermore, for example, an ultraviolet monitor unit 17 is attached to the reaction tank 10. The ultraviolet monitor unit 17 includes, for example, an ultraviolet intensity meter and a control panel, and monitors the amount of ultraviolet light irradiated from the ultraviolet light source 13 onto the treatment water, as well as the state of the ultraviolet light source 13 and the protective tube 14.

[0019] The covers 11 and 12 are detachably attached to the support parts 22 and 23, respectively, and cover the support parts 22 and 23.

[0020] The ultraviolet light source 13 emits ultraviolet light. An arrow L in FIG. 3 indicates an example of the direction of ultraviolet light emission. The ultraviolet light source 13 can emit infrared light to the treatment water flowing from the water inlet 24 to the drain outlet 25. The ultraviolet light source 13 has, for example, wiring connected to both ends thereof for supplying power to the ultraviolet light source 13, and is connected to a power supply source 16 for supplying power via the wiring. The ultraviolet light source 13 is, for example, an LED, a mercury lamp, or a metal halide lamp, and can emit ultraviolet light of a predetermined wavelength.

[0021] The protective tube 14 accommodates the ultraviolet light source 13. The protective tube 14 is made of a dielectric material that is transparent to ultraviolet light, such as quartz glass. The outer peripheral surface 14a of the protective tube 14 is the water contact surface that comes into contact with the treatment water.

[0022] Cleaning mechanism 15 has cleaning member 34, moving mechanism 32, and guide 41. Cleaning mechanism 15 moves cleaning member 34 in the axial direction of protective tube 14 using moving mechanism 32, and cleans outer peripheral surface 14a of protective tube 14 using cleaning member 34. Hereinafter, unless otherwise specified, the axial direction refers to the axial direction of protective tube 14.

[0023] Fig. 4 is an exploded perspective view showing a part of the ultraviolet irradiation device 4 of the first embodiment. Fig. 5 is a front view showing the cleaning member 34 of the first embodiment. As shown in Figs. 4 and 5, the cleaning member 34 is formed in an annular shape (for example, a circular ring shape), and the protective tube 14 is inserted inside. The cleaning member 34 is an example of a component for cleaning the annular member and the outer peripheral surface 14a of the protective tube 14.

[0024] As shown in FIG. 5, the cleaning member 34 has a base portion 61 and a cleaning portion 62. The base portion 61 is formed in an annular shape (for example, a circular ring shape). A plurality of through holes 34d are provided in the base portion 61. The cleaning portion 62 is located inside the base portion 61 and is fixed to the base portion 61. The cleaning portion 62 is formed in an annular shape (for example, a circular ring shape). The inner periphery of the cleaning portion 62 contacts the outer peripheral surface 14a of the protective tube 14. The cleaning portion 62 is, for example, a brush or a wiper blade. When the cleaning member 34 moves in the axial direction, the cleaning portion 62 slides on the outer peripheral surface 14a of the protective tube 14 to clean the outer peripheral surface 14a.

[0025] The cleaning member 34 is cut at one location. As a result, the cleaning member 34 has a pair of ends 34a, 34b that contact each other. The cleaning member 34 is elastic (flexible). The cleaning member 34 can be removed from the protective tube 14 by separating the pair of ends 34a, 34b. At this time, for example, the cleaning member 34 is twisted in a direction that separates the pair of ends 34a, 34b.

[0026] As shown in FIG. 3, the movement mechanism 32 includes a linear motion member 33, a drive source 36, a motion conversion mechanism 37, and a guide 41.

[0027] The linear motion member 33 is supported by a guide 41 so as to be movable in the axial direction. The guide 41 spans the pair of support portions 22, 23. The linear motion member 33 is formed, for example, in the shape of a flat plate. A plurality of through holes 32a to 32c are provided in the linear motion member 33. The protective tube 14 is inserted into the through hole 32a. The trapezoidal screw 38 is inserted into the through hole 32b. The guide 41 is inserted into the through hole 32c.

[0028] The cleaning member 34 is fixed to the surface of the linear moving member 33 facing the support part 22 by a fixing member 35. Specifically, the fixing member 35 is detachably coupled to the linear moving member 33 by a screw (not shown), and the cleaning member 34 is sandwiched between the fixing member 35 and the linear moving member 33. The screw that couples the fixing member 35 to the linear moving member 33 is inserted into a through hole 34d of the cleaning member 34. The linear moving member 33, the cleaning member 34, and the fixing member 35 constitute a linear moving unit 31, and move integrally in the axial direction.

[0029] The driving source 36 is, for example, a motor, and is supported by the support portion 23, for example.

[0030] The motion conversion mechanism 37 converts the rotational motion of the drive source 36 into linear motion in the axial direction of the linear motion unit 31. Specifically, the motion conversion mechanism 37 has a trapezoidal screw 38 and a nut 39. The trapezoidal screw 38 extends in the axial direction and is rotated by the drive source 36. The trapezoidal screw 38 is rotatably supported by a support member 40. The trapezoidal screw 38 is, for example, a trapezoidal screw. The nut 39 is a screw nut formed in an annular shape (for example, a circular ring). The nut 39 is detachably fixed, for example, by a screw or the like, to the surface of the linear motion member 33 on the support portion 22 side while meshing with the trapezoidal screw 38. The nut 39 is included in the linear motion unit 31. When the trapezoidal screw 38 is rotated by the drive source 36, the nut 39 moves in the axial direction in accordance with the rotation of the trapezoidal screw 38, and therefore the linear motion unit 31 moves in the axial direction. This causes the cleaning member 34 to move in the axial direction, and the cleaning mechanism 15 cleans the outer peripheral surface 14a of the protective tube 14. That is, the cleaning mechanism 15 cleans the outer peripheral surface 14a of the protective tube 14 by the movement of at least the cleaning member 34 and the nut 39.

[0031] Next, the pair of support portions 22, 23 of the reaction vessel 10 will be described in detail.

[0032] As shown in FIGS. 3 and 4 , the support portion 22 has a plurality of through holes 22a and 22b. One end of the protective tube 14 is inserted into the through hole 22a. The one end of the protective tube 14 is connected (fixed) to the support portion 22 by connecting members 71A and 72A. The connecting member 72A is sandwiched between the connecting member 71A and the support portion 22 with a portion inserted into the through hole 22a. The connecting members 71A and 72A are detachably connected to the support portion 22 by, for example, screws. The connecting members 71A and 72A and the one end of the protective tube 14 close the through hole 22a. A sealing member 80 such as an O-ring is interposed between the connecting members 71A and 72A and the support portion 22 and the protective tube 14 to ensure watertightness. The connecting member 71A is also referred to as a watertight flange member, and the connecting member 72A is also referred to as an adapter flange. The connecting member 72A does not necessarily have to be provided.

[0033] The through hole 22b is provided around the through hole 22a. The through hole 22b is aligned with the trapezoidal thread 38 in the axial direction. The through hole 22b is closed by a lid 73. The lid 73 is detachably attached to the outer surface of the support part 22 by screws or the like. The through hole 22b is formed to have a size that allows the cleaning member 34 to be removed from the protective tube 14. Specifically, the through hole 22b is formed to have a size that allows an operator to manually pass the cleaning member 34 through. The through hole 22b is an example of an opening. The through hole 22b is also called an inspection hatch or a work hatch.

[0034] As shown in FIG. 3, the support portion 23 is provided with a plurality of through holes 23a and 23b.

[0035] The other end of the protective tube 14 is inserted into the through hole 23a. The other end of the protective tube 14 is connected (fixed) to the support portion 23 by connecting members 71B and 72B. The connecting member 72B is sandwiched between the connecting member 71B and the support portion 23 with a portion inserted into the through hole 23a. The connecting members 71B and 72B are detachably connected to the support portion 23 with screws, for example. The connecting members 71B and 72B and the other end of the protective tube 14 close the through hole 23a. A seal member 80, such as an O-ring, is interposed between the connecting members 71B and 72B and the support portion 23 and the protective tube 14 to ensure watertightness. The connecting member 72B is also referred to as a watertight flange member, and the connecting member 72B is also referred to as an adapter flange. The connecting member 72B does not necessarily have to be provided.

[0036] The other end of the trapezoidal screw 38 is inserted into the through hole 23b. The other end of the trapezoidal screw 38 is connected to the support part 23 by a connecting member 74. The connecting member 74 is detachably connected to the support part 23 by, for example, a screw, with a portion of the connecting member 74 inserted into the through hole 23b. The connecting member 74 and the other end of the trapezoidal screw 38 close the through hole 23b. A seal member 80, such as an O-ring, is interposed between the connecting member 74 and the support part 23 and trapezoidal screw 38 to ensure watertightness. The driving source 36 is also attached to the connecting member 74. The connecting member 74 is also called a motor flange.

[0037] In the ultraviolet irradiation device 4 configured as above, for example, the outer circumferential surface 14a of the protective tube 14 is periodically cleaned by the cleaning mechanism 15. This cleaning causes wear on the cleaning member 34 and the nut 39. The cleaning member 34 and the nut 39 are consumable items.

[0038] When replacing the cleaning member 34 with a new one, the worker removes the lid 73. Next, the worker removes the fixing member 35. Next, the worker twists the cleaning member 34 to separate the pair of ends 34a, 34b, and removes the cleaning member 34 from the protective tube 14 by moving the protective tube 14 relatively between the pair of ends 34a, 34b. Then, the worker takes the cleaning member 34 out of the reaction tank 10 through the through-hole 22b. The worker attaches a new cleaning member 34 to the protective tube 14 by reversing the procedure of the removal described above.

[0039] When replacing the nut 39 with a new one, the worker removes the lid 73. Next, the worker removes the nut 39 from the linear motion member 33 and the trapezoidal screw 38, and takes it out of the reaction vessel 10 through the through-hole 22a. The worker attaches the new nut 39 to the linear motion member 33 by reversing the procedure of the removal described above.

[0040] As described above, the ultraviolet irradiation device 4 of this embodiment includes the ultraviolet light source 13, the protective tube 14, the reaction tank 10, and the cleaning mechanism 15. The ultraviolet light source 13 emits ultraviolet light. The protective tube 14 houses the ultraviolet light source 13 therein. The reaction tank 10 has a pair of support parts 22, 23 that are spaced apart in the axial direction of the protective tube 14 and support the protective tube 14, and an accommodation part 21 that houses the protective tube 14 across the pair of support parts 22, 23. The reaction tank 10 is provided with a water inlet 24 for supplying treated water to be treated and a drain outlet 25 for draining the treated water. The cleaning mechanism 15 has, as components for cleaning the outer peripheral surface 14a of the protective tube 14, a trapezoidal screw 38 (first member) supported by the support portion 22 and extending in the axial direction, and a cleaning member 34 (annular member) into which a target member (the protective tube 14, as an example), which is either the trapezoidal screw 38 or the protective tube 14, is inserted, and the outer peripheral surface 14a is cleaned by the movement of the cleaning member 34. The cleaning member 34 has a pair of end portions 34a, 34b that contact each other and can be removed from the protective tube 14 by separating the pair of end portions 34a, 34b. The reaction vessel 10 is provided with a through-hole 22b (opening) that enables the cleaning member 34 to be removed from the protective tube 14.

[0041] According to this configuration, the cleaning member 34 can be removed from the protective tube 14 without removing the support parts 22, 23 from the accommodation part 21, which makes it easy to remove the cleaning member 34. Furthermore, according to the above configuration, the cleaning member 34 can be removed from the protective tube 14 without removing the protective tube 14 from the reaction tank 10, which makes it easy to remove the cleaning member 34.

[0042] The through-hole 22b is provided in the support portion 22.

[0043] According to this configuration, the configuration of the accommodation portion 21 can be simplified compared to a configuration in which the through-hole 22b is provided in the accommodation portion 21.

[0044] Next, a modified example of this embodiment will be described. Fig. 6 is a front view showing a cleaning member 34 of a modified example of the first embodiment. As shown in Fig. 6, the cleaning member 34 of this modified example is divided into two or more members. As an example, the cleaning member 34 is divided into a first divided member 34A and a second divided member 34B, and the first divided member 34A and the second divided member 34B sandwich the protective tube 14.

[0045] The first divided member 34A and the second divided member 34B are each formed in an arc shape along a semicircle. Ends 34Aa and 34Ab of the first divided member 34A are in contact with end portions 34Ba and 34Bb of the second divided member 34B. In this state, the cleaning member 34 is fixed to the linearly moving member 33 by fixing members 35.

[0046] When removing the cleaning member 34 from the linearly moving member 33, the worker removes the fixing member 35 from the linearly moving member 33. Next, the worker separates the two end portions 34Aa, 34Ab of the first divided member 34A from the two end portions 34Ba, 34Bb of the second divided member 34B, and removes both the first divided member 34A and the second divided member 34B from the protective tube 14. The end portion 34Aa of the first divided member 34A and the end portion 34Ba of the second divided member 34B are an example of a pair of end portions. The end portion 34Ab of the first divided member 34A and the end portion 34Bb of the second divided member 34B are also an example of a pair of end portions.

[0047] In the above embodiment, the annular member is the cleaning member 34 and the target member is the protective tube 14, but the present invention is not limited to this. For example, the annular member may be the nut 39 and the target member may be the trapezoidal screw 38.

[0048] <Second embodiment> Fig. 7 is a cross-sectional view showing a part of the ultraviolet irradiation device 4 of the second embodiment. Fig. 8 is a cross-sectional view showing a part of the ultraviolet irradiation device 4 of the second embodiment.

[0049] As shown in FIGS. 7 and 8, the cleaning member 34 and the nut 39 are provided on the surface of the linear motion member 33 on the support portion 23 side.

[0050] The through holes 23a and 23b of the support part 23 are formed to have sizes that allow the trapezoidal screw 38 and the protective tube 14 to be inserted and removed, respectively. The through holes 23a and 23b are an example of an entrance and exit. The support part 23 is an example of a first support part.

[0051] When replacing the cleaning member 34 (FIG. 7) with a new one, the worker removes the connecting members 71B and 72B and takes the protective tube 14 out of the reaction vessel 10 through the through-hole 23a. Next, the worker removes the fixing member 35 from the linearly moving member 33 and removes the cleaning member 34 from the linearly moving member 33. The worker then takes the removed cleaning member 34 out of the reaction vessel 10 through the through-hole 23a. The worker attaches the new cleaning member 34 to the protective tube 14 by reversing the procedure of removal described above.

[0052] When replacing the nut 39 (FIG. 8) with a new one, the worker removes the drive source 36 and the coupling member 74. Next, the worker removes the nut 39 from the linear motion member 33 and the trapezoidal screw 38, and takes it out of the reaction vessel 10 through the through-hole 23ba. The worker attaches the new nut 39 to the linear motion member 33 by reversing the procedure of the removal described above.

[0053] As described above, in this embodiment, the connecting members 71B, 72B, and 74 support the trapezoidal screw 38 (target member) and the protective tube 14 (target member), are detachably connected to the support portion 23 (first wall), and together with the trapezoidal screw 38 and the protective tube 14, block the through holes 23a and 23b (entrance and exit).

[0054] According to this configuration, the cleaning member 34 (annular member) and the nut 39 (annular member) can be removed from the trapezoidal screw 38 and the protective tube 14 without removing the support parts 22, 23 from the storage part 21, so that the cleaning member 34 and the nut 39 can be easily removed.

[0055] <Third embodiment> FIG. 9 is a front view showing a part of a linear motion unit 31 according to the third embodiment.

[0056] 9, the linear motion unit 31 of this embodiment has a support member 90. The support member 90 supports the cleaning member 34. The support member 90 is detachably fixed to the linear motion member 33 with screws or the like, and moves in the axial direction integrally with the linear motion member 33. The support member 90 is detachable from the linear motion member 33 and, therefore, from the movement mechanism 32.

[0057] The support member 90 is formed in a plate shape. The support member 90 has a base portion 90a and a protrusion portion 90b. A through hole 90c is formed in the base portion 90a. The cleaning member 34 is fitted in the through hole 90c. The cleaning member 34 is detachably fixed to the support member 90 with a screw or the like. The protective tube 14 (FIG. 3) is inserted into the through hole 90c. The base portion 90a is also provided with a notch 61d (opening). A trapezoidal screw 38 is inserted into the notch 61d.

[0058] The protrusion 90b protrudes from the base 90a. A cleaning member 91 is fixed to the tip of the protrusion 90b. The cleaning member 91 is a brush, a wiper blade, or the like. The cleaning member 91 moves axially together with the support member 90 and cleans a window member (not shown) provided in the reaction vessel 10.

[0059] When replacing the cleaning member 34 with a new one, the worker removes the connecting members 71B and 72B and takes the protective tube 14 out of the reaction vessel 10 through the through-hole 23a. Next, the worker removes the support member 90 from the linearly moving member 33 and removes the cleaning member 34 together with the support member 90 from the linearly moving member 33. At this time, because the trapezoidal screw 38 is positioned in the cutout 61d, the trapezoidal screw 38 does not get caught on the linearly moving member 33, and the support member 90 can be removed. The worker then takes the removed cleaning member 34 out of the reaction vessel 10 through the through-hole 23a. The worker attaches the new cleaning member 34 to the protective tube 14 by reversing the removal procedure described above.

[0060] As described above, in this embodiment, the support member 90 is detachable from the movement mechanism 32. The support part 23 (first support part) that supports the protective tube 14 is provided with a through-hole 23a (entrance / exit) that allows the protective tube 14 to be inserted into and removed from the reaction vessel 10. The coupling members 71B and 72B support the protective tube 14, are detachably coupled to the support part 23, and close the through-hole 23b (entrance / exit) together with the protective tube 14. The reaction vessel 10 is provided with a through-hole 22b (opening) that allows the cleaning member 34 to be removed from the protective tube 14.

[0061] According to this configuration, the cleaning member 34 can be removed from the protective tube 14 without removing the support parts 22, 23 from the housing part 21, which makes it easy to remove the cleaning member 34. Furthermore, according to the above configuration, the cleaning member 34 can be removed from the protective tube 14 without removing the trapezoidal screw 38 from the housing part 21, which makes it easy to remove the cleaning member 34.

[0062] In the above embodiment, the moving mechanism 32 has the trapezoidal screw 38 and the nut 39, but is not limited to this. For example, the moving mechanism 32 may be configured to move the cleaning member 34 in the axial direction by an air cylinder.

[0063] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0064] 4…Ultraviolet irradiation device 10...Reaction tank 13...UV light source 14...Protective tube (target component) 14a...Outer surface 21...Storage section 22...Support part 22b...Through hole (opening) 23...Support portion (first support portion) 23a, 23b...Through hole (entrance / exit, opening) 24…Water inlet 25…Drain port 15...Cleaning mechanism 32...Movement mechanism 34...Cleaning member (annular member) 34a, 34b, 34Aa, 34Ab, 34Ba, 34Bb...end 38...Trapezoidal screw (first member, target member) 39... Nut (annular member) 90...Support member

Claims

1. an ultraviolet light source that irradiates ultraviolet light; a protective tube accommodating the ultraviolet light source therein; a reaction tank having a pair of support parts that are arranged at an interval in the axial direction of the protective pipe and support the protective pipe, and an accommodation part that accommodates the protective pipe and spans the pair of support parts, and the reaction tank is provided with a water inlet for supplying treated water to be treated and a drain outlet for draining the treated water; a cleaning mechanism having, as components for cleaning the outer peripheral surface of the protective tube, a first member supported by the support portion and extending in the axial direction, and an annular member into which a target member, which is either the first member or the protective tube, is inserted, and which cleans the outer peripheral surface by movement of the annular member; Equipped with the annular member has a pair of end portions that contact each other, and is detachable from the target member by separating the pair of end portions; The reaction tank is provided with an opening that allows the annular member to be removed from the target member. Ultraviolet irradiation device.

2. an ultraviolet light source that irradiates ultraviolet light; a protective tube accommodating the ultraviolet light source therein; a reaction tank having a pair of support parts that are arranged at an interval in the axial direction of the protective pipe and support the protective pipe, and an accommodation part that accommodates the protective pipe and spans the pair of support parts, and the reaction tank is provided with a water inlet for supplying treated water to be treated and a drain outlet for draining the treated water; a cleaning mechanism having, as components for cleaning the outer peripheral surface of the protective tube, a first member supported by the support portion and extending in the axial direction, and an annular member into which a target member, which is either the first member or the protective tube, is inserted, and which cleans the outer peripheral surface by movement of the annular member; A coupling member; Equipped with the first support part that supports the target component is provided with an entrance / exit that allows the target component to be put into and taken out of the reaction tank; The connecting member supports the target member, is detachably connected to the first support portion, and blocks the entrance / exit together with the target member. Ultraviolet irradiation device.

3. an ultraviolet light source that irradiates ultraviolet light; a protective tube accommodating the ultraviolet light source therein; a reaction tank having a pair of support parts that are arranged at an interval in the axial direction of the protective pipe and support the protective pipe, and an accommodation part that accommodates the protective pipe and spans the pair of support parts, and the reaction tank is provided with a water inlet for supplying treated water to be treated and a drain outlet for draining the treated water; a cleaning mechanism including: an annular cleaning member into which the protective tube is inserted and which cleans the outer peripheral surface of the protective tube; a support member which supports the cleaning member; and a movement mechanism which moves the support member in the axial direction of the protective tube; A coupling member; Equipped with the support member is detachable from the movement mechanism, the first support part that supports the protective tube is provided with an opening that allows the protective tube to be inserted into and removed from the reaction vessel; the connecting member supports the protective tube, is detachably connected to the first support portion, and closes the entrance together with the protective tube; The reaction tank is provided with an opening that allows the cleaning member to be removed from the protective tube. Ultraviolet irradiation device.

4. The annular member is a cleaning member that cleans the outer circumferential surface.

3. The ultraviolet irradiation device according to claim 1 or 2.

5. The cleaning mechanism includes: an annular cleaning member into which the protective tube is inserted and which cleans the outer peripheral surface of the protective tube; a support member that supports the cleaning member; and a movement mechanism that moves the support member in an axial direction of the protective tube. and The moving mechanism includes the first member, which is a trapezoidal screw extending in the axial direction, and the annular member, which is a nut coupled to the trapezoidal screw and moving in the axial direction in response to rotation of the trapezoidal screw; and The cleaning member is coupled to the nut and moves in the axial direction together with the nut.

3. The ultraviolet irradiation device according to claim 1 or 2.

6. The opening is provided in the support portion. The ultraviolet irradiation device according to claim 1 or 3.

Images