Cap unit, storage tank, and flowing water sterilization device

Abstract

To provide a cap unit that increases sterilization performance with respect to a sterilization target while maintaining water-retaining properties of a housing, and that is capable of irradiating a desired range with ultraviolet light, a storage tank, and a flowing water sterilization device.SOLUTION: A cap unit includes: a light source unit that is provided with a light emitting element and a substrate on which the light emitting element is mounted; a housing that is provided with an accommodation space for the light source unit, has an opening at a prescribed position on a side facing a sterilization target, and houses the light source unit such that the opening and the light emitting element face each other; an ultraviolet light transmitting window part that closes the opening; and a gasket that is positioned between the light source unit and the ultraviolet light transmitting window part and prevents ingress of the sterilization target into the light source unit side in the accommodation space. The gasket is provided with a reflector wall part that is light-reflective and provided to be recessed toward the light source unit in such a manner as to surround a lateral area of the light emitting element.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cap unit, and a storage tank and a flushing sterilizer equipped with the cap unit. [Background technology]

[0002] For example, a storage mechanism for storing (storing) water for ice making is provided in an ice maker, etc. Also, a circulating water supply mechanism for circulating and supplying drinking water or industrial water is provided in a water server, a drink server, a cooling water circulator (so-called chiller), etc.

[0003] The storage tank and water supply pipes in the storage mechanism, as well as the water supply pipes in the circulating water supply mechanism, are fixed inside the device and cannot be easily removed from the device body. Furthermore, the interiors of these components (the storage tank, water supply pipes, water supply pipes, and other components involved in water storage and circulation) cannot be frequently cleaned. Therefore, bacteria may grow in these components.

[0004] Here, technologies for suppressing bacterial growth inside the water supply pipes and storage tanks of ice makers are disclosed in the following Patent Documents 1 and 2. Specifically, the invention disclosed in Patent Document 1 includes an ultraviolet light irradiator that irradiates ultraviolet light onto the water in the water supply pipe. Also, the invention disclosed in Patent Document 2 includes an ultraviolet light irradiator that irradiates ultraviolet light onto the water in the storage tank. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-20561 [Patent Document 2] Japanese Patent Application Publication No. 2019-219095 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the ultraviolet light irradiators disclosed in Patent Documents 1 and 2 do not have a section for distributing the ultraviolet light emitted from the light-emitting element. As a result, the amount of ultraviolet light irradiated per unit area (illuminance) decreases, leading to a decrease in the ability to kill bacteria. Furthermore, if the water supply pipe or storage tank is made of resin, the irradiation range of the ultraviolet light cannot be controlled, so there is a possibility that the water supply pipe or storage tank will also be irradiated with ultraviolet light with a corresponding illuminance. As a result, there is a possibility that deterioration of the resin parts will be accelerated.

[0007] In view of the above problems, the present invention aims to provide a cap unit, a storage tank, and a running water sterilization device that can improve the sterilization ability of the object to be sterilized while maintaining the watertightness inside the housing and can irradiate ultraviolet light within a desired range. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the cap unit according to the present invention comprises: a light source unit including a light emitting element and a substrate on which the light emitting element is mounted; a housing that includes an accommodation space for the light source unit and has an opening at a predetermined position on the side facing the object to be sterilized, and that accommodates the light source unit so that the opening faces the light-emitting element; an ultraviolet light transmitting window portion that closes the opening; a packing positioned between the light source unit and the ultraviolet light transmitting window portion, which prevents the object to be sterilized from entering the light source unit side in the accommodation space; Equipped with The packing has light reflectivity and includes a reflector wall portion recessed toward the light source unit so as to surround a side area of ​​the light emitting element. It is characterized by:

[0009] According to this aspect of the present invention, the packing, which is located between the light source unit and the ultraviolet light-transmitting window and prevents the object to be sterilized from entering the light source unit, includes a light-reflective reflector wall. Therefore, the irradiation range of ultraviolet light from the light source unit can be controlled (light distribution) to a desired range. This allows the watertightness of the housing to be maintained while enhancing the sterilization ability of the object to be sterilized. Alternatively, even if a cap unit-mounted object (e.g., a storage tank) equipped with the cap unit of the present invention includes a plastic part, the ultraviolet light can be distributed to avoid irradiation of the plastic part. This prevents problems such as accelerated deterioration of the plastic part due to irradiation with ultraviolet light.

[0010] In addition, in the cap unit according to the present invention, It is preferable that the packing further includes an extending portion that extends radially outward from the reflector wall portion and abuts against a predetermined position on the housing.

[0011] According to this aspect of the present invention, the electronic components mounted on the substrate of the light source unit are covered by the reflector wall portion and the outer extension portion of the packing. This provides a space that can block ultraviolet light from the light-emitting element, and the electronic components can be housed in this space. This allows relatively inexpensive electronic components that are not ultraviolet-resistant (UV-resistant) to be mounted on the substrate. In other words, this aspect of the present invention does not result in excessive cost increases for the cap unit.

[0012] Furthermore, in the cap unit according to the present invention, It is preferable that the diameter of the reflector wall portion increases from the light source unit toward the opening.

[0013] According to this aspect of the present invention, the ultraviolet light component emitted from the light-emitting element at a wide angle can also be directed toward the opening of the housing, thereby increasing the illuminance of the ultraviolet light irradiated over a predetermined range and improving the sterilization ability of the object to be sterilized.

[0014] Furthermore, in the cap unit according to the present invention, The reflector wall preferably extends along the height direction of the housing.

[0015] According to this aspect of the present invention, the irradiation range of the ultraviolet light can be narrowed to a desired range compared to when the reflector wall portion is not provided. As a result, the ultraviolet light can be distributed so as not to irradiate the resin parts of the cap unit mounting body (e.g., the storage tank, etc.). This makes it possible to suppress problems such as accelerated deterioration of the resin parts due to irradiation with ultraviolet light.

[0016] Furthermore, in the cap unit according to the present invention, an electronic component different from the light-emitting element is mounted on the substrate; a thick portion relatively close to the light emitting element and a thin portion relatively far from the light emitting element are formed in the expanded diameter portion of the reflector wall portion, It is preferable that the electronic component faces a rear region of the expanded diameter portion of the reflector wall portion.

[0017] According to this aspect of the present invention, by providing a thick portion relatively close to the light emitting element in the expanded diameter portion of the reflector wall, it is possible to prevent ultraviolet light from the light emitting element from passing through the reflector wall, and by providing a thin portion relatively far from the light emitting element in the expanded diameter portion of the reflector wall, it is possible to expand the storage space for electronic components.

[0018] Furthermore, the cap unit according to the present invention is The light from the light emitting element penetrates the reflector wall and is diffusely reflected therein, It is preferable that an attachment made of a regular reflection material is provided on at least one of the front and rear surfaces of the expanded diameter portion of the reflector wall portion.

[0019] According to this aspect of the present invention, by providing an attachment made of a specularly reflective material on at least one of the front and back surfaces of the expanded diameter portion of the reflector wall, it is possible to improve the reflection characteristics of ultraviolet light from the light-emitting element or prevent ultraviolet light from the light-emitting element from passing through the reflector wall.

[0020] The storage tank according to the present invention further comprises: a through hole provided at a predetermined position; the cap unit that closes the through hole; Equipped with The object to be sterilized is stored inside It is characterized by:

[0021] According to this aspect of the present invention, the watertightness inside the cap unit is maintained, the sterilization ability of the object to be sterilized is enhanced, and the ultraviolet light can be distributed so as to avoid irradiation of the resin parts of the storage tank, thereby suppressing problems such as accelerated deterioration of the resin parts due to irradiation of ultraviolet light.

[0022] In addition, the running water sterilizer according to the present invention is A flow path pipe through which the object to be sterilized passes; a through hole provided at a predetermined position of the flow path pipe; the cap unit that closes the through hole; The present invention is characterized by comprising:

[0023] According to this aspect of the present invention, the watertightness inside the cap unit is maintained, the sterilization ability of the object to be sterilized is improved, and irradiation of the resin parts of the running water sterilizer with ultraviolet light is avoided, thereby suppressing problems such as accelerated deterioration of the resin parts due to irradiation with ultraviolet light. [Effects of the Invention]

[0024] According to the present invention, it is possible to provide a cap unit, a storage tank, and a running water sterilization device that can improve the sterilization ability of an object to be sterilized while maintaining watertightness within the housing and can irradiate ultraviolet light within a desired range. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 2 is a perspective view of a cap unit according to an embodiment of the present invention. [Figure 2] FIG. 2 is a vertical cross-sectional view of the cap unit according to the embodiment. [Figure 3] FIG. 2 is a vertical cross-sectional view of the cap unit according to the embodiment. [Figure 4] 5A and 5B are diagrams showing the distribution of illuminance of ultraviolet light emitted from the cap unit according to the embodiment. [Figure 5] FIG. 4 is an enlarged view of a packing (a wall portion for a reflector) according to the embodiment. [Figure 6] 10A and 10B are diagrams showing modified examples of the cap unit according to the embodiment. [Figure 7] FIG. 10 is a diagram showing another modified example of the cap unit according to the embodiment. [Figure 8] 1 is a diagram showing the cap unit of this embodiment attached to a fluid sterilization device. FIG. [Figure 9] 10A and 10B are diagrams showing the cap unit of this embodiment attached to another fluid sterilization device. DETAILED DESCRIPTION OF THE INVENTION

[0026] A fluid sterilization device according to one embodiment of the present invention will be described in detail below with reference to the drawings. First, a cap unit 1 according to this embodiment will be described in detail with reference to Figs. 1 to 5. Here, Fig. 1 is a perspective view of the cap unit 1. Figs. 2 and 3 are vertical cross-sectional views of the cap unit 1. Furthermore, Fig. 4 is a diagram showing the distribution of ultraviolet light irradiance emitted from the cap unit 1. Furthermore, Fig. 5 is an enlarged view of a packing (reflector wall) provided in the cap unit 1.

[0027] As shown in Figure 1, cap unit 1 is attached to, for example, a storage tank 2 that stores an object to be sterilized (water, etc.). More specifically, cap unit 1 covers a through-hole 4 provided in a predetermined location on storage tank 2 (the location to which it is attached may be the bottom or side of storage tank 2, but in this embodiment, it is the top surface 3 of storage tank 2). As will be described later, a light source unit (light-emitting element) provided in cap unit 1 is disposed so as to face the object to be sterilized in storage tank 2. This causes ultraviolet light from the light-emitting element of cap unit 1 to be irradiated toward the object to be sterilized.

[0028] As shown in FIG. 2, the cap unit 1 according to this embodiment includes a light source unit 10, a housing 20, an ultraviolet light transmitting window portion 30 (for example, quartz glass), a packing 40, and the like.

[0029] The light source unit 10 includes a light emitting element 11 that emits ultraviolet light (for example, light having a peak wavelength in the range of 100 nm to 400 nm), a substrate 12 on which the light emitting element 11 is mounted, and other electronic components 13 such as a power supply circuit and connectors that supply current to the light emitting element 11, which are also mounted on the substrate 12. The type of the light emitting element 11 is not particularly limited, and examples include semiconductor light emitting elements such as LEDs (light emitting diodes) and laser diodes. Furthermore, although the number of light emitting elements 11 in this embodiment is one, there may be two or more.

[0030] Next, the housing 20 comprises a housing body 21 that fits into the through-hole 4 of the storage tank 2. Here, the housing body 21 comprises a bottom wall 211 that faces the object to be sterilized in the storage tank 2, a side wall 212 that is continuous with the edge of the bottom wall 211 and rises on the top side of the housing body 21, and a flange 213 that extends approximately horizontally radially outward from the top end of the side wall 212. As shown in Figure 2, the flange 213 comes into contact with the top surface 3 of the storage tank 2 and supports the housing body 21.

[0031] A first opening 214 is formed in the bottom wall 211 of the housing main body 21 (at a predetermined position on the side facing the object to be sterilized). As shown in FIG. 2, the light-emitting element 11 of the light source unit 10 faces the first opening 214. Furthermore, the ultraviolet light-transmitting window 30 closes the first opening 214. This allows the ultraviolet light emitted from the light-emitting element 11 to pass through the first opening 214 (ultraviolet light-transmitting window 30) and be irradiated onto the object to be sterilized in the storage tank 2.

[0032] The top surface of the housing body 21 is open (second opening 215). The housing 20 further includes a housing lid 22 that closes the second opening 215 of the housing body 21. As shown in Fig. 2, the housing lid 22 includes a lid body 221 and a lid sidewall 222 that extends from the lid body 221 toward the bottom side.

[0033] 2, when the housing lid 22 closes the second opening 215 of the housing main body 21, the lid sidewall 222 fits inside the housing main body 21. This defines an accommodation space 23 for the light source unit 10. Here, the light source unit 10 (substrate 12) is attached to the inner wall of the lid main body 221.

[0034] 2, the packing 40 fills the gap formed between the ultraviolet light transmitting window 30 and the lid side wall 222 of the housing lid 22, thereby improving the waterproofing properties of the housing 20. The packing 40 is also light reflective and includes a reflector wall 41 recessed toward the light source unit 10 (substrate 12) so as to surround the side area of ​​the light emitting element 11. A tip 411 of the reflector wall 41 opens so that the light emitting element 11 faces inward.

[0035] The packing 40 further includes an extending portion 42 that extends radially outward from the reflector wall portion 41 and abuts against the inner wall of the housing 20 (in this embodiment, the lid side wall 222 of the housing lid portion 22).

[0036] The packing 40 in this embodiment is made of polytetrafluoroethylene (PTFE). However, the material of the packing 40 is not limited to this as long as it has light reflectivity. Other materials for the packing 40 include resins such as perfluoroethylene propene copolymer (FEP) and perfluoroalkoxyalkane (PFA).

[0037] Here, the reflector wall 41 has a function of distributing the ultraviolet light emitted from the light-emitting element 11. However, the shape of the reflector wall 41 is not limited as long as it can distribute the ultraviolet light emitted from the light-emitting element 11. Other examples of the reflector wall 41 include a mortar structure (a shape in which the diameter increases from the light source unit 10 (substrate 12) toward the first opening 214) as shown in Fig. 2 and a straight tube structure (a shape in which the reflector wall 41 extends along the height direction of the housing 20 (the up-and-down direction in the figure)) as shown in Fig. 3.

[0038] 2, the electronic component 13 mounted on the substrate 12 of the light source unit 10 is covered by the reflector wall portion 41 and the extension portion 42 of the packing 40. That is, according to this embodiment, a space capable of blocking ultraviolet light from the light-emitting element 11 is provided for the electronic component 13. This allows a relatively inexpensive electronic component 13 that is not ultraviolet resistant (UV resistant) to be mounted on the substrate 12. As a result, the cost of the cap unit does not increase excessively.

[0039] Here, a planar light-receiving sensor was placed substantially parallel to the width direction of the housing 20 at a position facing the bottom wall 211 of the housing 20 (for example, the light-receiving sensor was placed 50 mm away from the bottom wall 211), and the illuminance of ultraviolet light was measured according to the distance from the optical axis of the light-emitting element 11 (the distance from the origin when the intersection of the optical axis of the light-emitting element 11 and the light-receiving sensor is taken as the origin) for three types of packing 40, one with a mortar-shaped reflector wall 41 (see FIG. 2), one with a straight tube structure (see FIG. 3), and one without a reflector wall 41. The measurement results are shown in FIG.

[0040] 4, the one in which the reflector wall portion 41 has a mortar-shaped configuration has a uniformly improved illuminance of ultraviolet light over the entire measurement range compared to the one without the reflector wall portion 41. Furthermore, the one in which the reflector wall portion 41 has a straight pipe structure has a narrower irradiation range of ultraviolet light compared to the one without the reflector wall portion 41 (i.e., the light was distributed to narrow the irradiation range of ultraviolet light).

[0041] As described above, if the reflector wall 41 is formed in a cone-shaped configuration, the illuminance of the ultraviolet light emitted from the light-emitting element 11 can be increased, thereby improving the sterilization ability of the object to be sterilized. Furthermore, if the reflector wall 41 is formed in a straight tube structure, the irradiation range of the ultraviolet light emitted from the light-emitting element 11 can be narrowed to a desired range. As a result, the ultraviolet light can be distributed so that it is not irradiated onto, for example, resin parts such as the storage tank 2. This can prevent problems such as accelerated deterioration of the resin parts.

[0042] Incidentally, when a resin such as PTFE (such as a fluororesin) is used as the packing 40, as shown in FIG. 5, ultraviolet light that reaches the reflector wall portion 41 of the packing 40 contains components that are diffusely reflected after penetrating the interior from the surface of the reflector wall portion 41.

[0043] More specifically, ultraviolet light emitted from the light emitting element 11 is incident approximately horizontally on the tip 411 of the reflector wall portion 41 located near the light emitting element 11. When a material that internally diffusely reflects light, such as PTFE, is used, ultraviolet light is reflected after passing through the vicinity of the surface. Therefore, unless an appropriate thickness is ensured for the tip 411 of the reflector wall portion 41, ultraviolet light that has entered the tip 411 side of the reflector wall portion 41 may pass through the reflector wall portion 41 and be emitted toward the electronic component 13.

[0044] In contrast, the ultraviolet light emitted from the light emitting element 11 is incident obliquely on the portion distant from the light emitting element 11. That is, the apparent thickness of the reflector wall 41 at the portion distant from the light emitting element 11 increases with respect to the angle of incidence of the ultraviolet light. Therefore, the thickness of the portion of the reflector wall 41 distant from the light emitting element 11 can be made thinner than the tip 411 of the reflector wall.

[0045] From this perspective, it is preferable to provide a space that can appropriately accommodate the electronic component 13 mounted on the substrate 12 while ensuring light blocking to the electronic component 13 side. Specifically, as shown in Fig. 5, it is preferable to increase the thickness of the tip 411 of the reflector wall portion 41 and decrease the thickness of the reflector wall portion 41 from there to a predetermined position toward the extending portion 42. Due to such a change in thickness of the reflector wall portion 41, in this embodiment, it is possible to arrange the electronic component 13 in an area that overlaps with the inclined surface of the reflector wall portion 41 in the light output surface direction in a front view (arranging the light emitting element 11 and the electronic component 13 other than the light emitting element 11 so as to face each other across the tip 411 of the reflector wall portion 41).

[0046] 5, in a cross-sectional view, the back surface (surface on the electronic component 13 side) of the reflector wall 41 has a curved shape that is recessed in a substantially arc shape toward the front surface (surface on the light-emitting element 11 side) of the reflector wall 41. By forming the reflector wall 41 in this shape, it is possible to expand the accommodation space for the electronic component 13 while ensuring the ability to block ultraviolet light from the light-emitting element 11.

[0047] The embodiments of the present invention have been described above in detail. However, the above description is provided to facilitate understanding of the present invention and is not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit of the present invention. Furthermore, the present invention includes equivalents thereof.

[0048] 6, the cap unit 1 may further include a first attachment 50 having a male screw groove 51 formed on the radially outer side of the side wall 212 of the housing main body 21. In this case, a female screw groove 52 that screws into the male screw groove 51 of the first attachment 50 is formed on the inner wall of the through hole 4 of the storage tank 2.

[0049] 7, the cap unit 1 may also include a second attachment 61 and a third attachment 62 made of a specularly reflective material that cover the front surface 412 and the back surface 413 of the reflector wall portion 41 of the packing 40. The specularly reflective material is, for example, a metal such as aluminum. Attaching the second attachment 61 can improve the light distribution of the ultraviolet light irradiated from the light-emitting element 11 toward the object to be sterilized. Attaching the third attachment 62 can prevent the ultraviolet light emitted from the light-emitting element 11 from passing through the reflector wall portion 41 and irradiating the electronic component 13.

[0050] Furthermore, although the cap unit 1 in the above-described embodiment is attached to a storage tank 2 that stores the object to be sterilized, it may also be attached to, for example, an approximately I-shaped (see Figure 8) or an approximately L-shaped flow path pipe 6, 7 (see Figure 9) in a fluid sterilization device 5. [Industrial Applicability]

[0051] The cap unit 1 according to the present invention is attached to, for example, a storage (water storage) tank of an ice maker or the like, an ultraviolet light sterilizer, a water purifier, a hot water heater, a water supply pipe, a cooling water circulator, a water server, a drink server, etc. However, its uses are not limited to these. [Explanation of symbols]

[0052] 1... Cap unit 10...Light source unit 11...Light emitting element 12... Circuit board 13...Electronic components 20. Housing 21...Housing body 211...Bottom wall 212…Side wall 213...Flange 214...First opening 215...Second opening 22...Housing lid 221…Lid body 222…Lid side wall 23...Light source unit storage space 30...Ultraviolet light transmitting window 40...Packing 41...Reflector wall 411...Tip of the wall for reflector 412...Reflector wall surface 413...Back of reflector wall 42...Extension part 50...First attachment 51...Male screw groove 52...Female screw groove 61...Second attachment 62...Third attachment 2...Storage tank 3...Top of storage tank 4...Through hole provided in the storage tank 5...Fluid sterilizer 6...I-shaped flow pipe 7...Approximately L-shaped flow pipe

Claims

1. A light source unit including a light emitting element and a substrate on which the light emitting element is mounted; a housing that includes an accommodation space for the light source unit, has a first opening at a predetermined position on a side facing an object to be sterilized, and accommodates the light source unit such that the first opening faces the light emitting element; an ultraviolet light transmitting window portion that closes the first opening; a packing located between the light source unit and the ultraviolet light transmitting window portion, the packing preventing the object to be sterilized from entering the light source unit side in the accommodation space; Equipped with The packing has light reflectivity and includes a reflector wall portion recessed toward the light source unit so as to surround a side area of ​​the light emitting element. A cap unit characterized by:

2. The packing further includes an extension portion that extends radially outward from the reflector wall portion and abuts against the housing. The cap unit according to claim 1 .

3. Light emitted from a light emitting element is directly incident on the reflector wall portion, The reflector wall portion has a larger diameter as it moves from the light source unit to the first opening portion. The cap unit according to claim 1 or 2.

4. The reflector wall portion extends along the height direction of the housing. The cap unit according to claim 1 or 2.

5. A light source unit including a light emitting element and a substrate on which the light emitting element is mounted; a housing that includes an accommodation space for the light source unit, has a first opening at a predetermined position on a side facing an object to be sterilized, and accommodates the light source unit such that the first opening faces the light emitting element; an ultraviolet light transmitting window portion that closes the first opening; a packing located between the light source unit and the ultraviolet light transmitting window portion, the packing preventing the object to be sterilized from entering the light source unit side in the accommodation space; Equipped with the packing has light reflectivity and includes a reflector wall portion recessed toward the light source unit so as to surround a side area of ​​the light emitting element, the reflector wall portion has a diameter that increases from the light source unit toward the first opening portion, An electronic component different from the light-emitting element is mounted on the substrate, In the expanding portion of the reflector wall portion, a thick portion relatively close to the light emitting element and a thin portion relatively far from the light emitting element are formed, The electronic component faces the rear region of the expanding portion of the reflector wall. Cap unit.

6. A light source unit including a light emitting element and a substrate on which the light emitting element is mounted; a housing that includes an accommodation space for the light source unit, has a first opening at a predetermined position on a side facing an object to be sterilized, and accommodates the light source unit such that the first opening faces the light emitting element; an ultraviolet light transmitting window portion that closes the first opening; a packing located between the light source unit and the ultraviolet light transmitting window portion, the packing preventing the object to be sterilized from entering the light source unit side in the accommodation space; Equipped with the packing has light reflectivity and includes a reflector wall portion recessed toward the light source unit so as to surround a side area of ​​the light emitting element, the reflector wall portion has a diameter that increases from the light source unit toward the first opening portion, In the reflector wall portion, the light from the light emitting element penetrates inside and is diffusely reflected, An attachment made of a regular reflection material is provided on at least one of the front and back surfaces of the expanding portion of the reflector wall. Cap unit.

7. 3. The cap unit according to claim 1, wherein the packing is made of any one of polytetrafluoroethylene, perfluoroethylene propene copolymer, and perfluoroalkoxyalkane.

8. The housing has a housing lid and a housing body, The housing body has a bottom wall in which the first opening is formed, a side wall connected to an edge of the bottom wall and rising upward, and a second opening, The housing lid has a lid body and a lid sidewall extending from the lid body toward a bottom side, The lid side wall is fitted into the second opening to define the storage space, 3. The cap unit according to claim 1, wherein the packing prevents the object to be sterilized from entering the storage space by filling a gap formed between the ultraviolet light transmitting window and a bottom surface of the side wall of the lid.

9. 3. The cap unit according to claim 1, wherein the housing has a flange extending generally horizontally on the radially outer side.

10. 3. The cap unit according to claim 1, further comprising an attachment having a screw groove formed on the radially outer side of the housing.

11. A through hole; The cap unit according to claim 1 or 2, which closes the through hole; Equipped with The object to be sterilized is stored inside Storage tank.

12. A flow path pipe through which the object to be sterilized passes; a through hole provided in the flow passage pipe; The cap unit according to claim 1 or 2, which closes the through hole; A running water sterilization device.

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