Fluid sterilization apparatus

Abstract

To provide a fluid sterilization apparatus capable of suppressing chipping of a corner portion at a periphery of a window.SOLUTION: A fluid sterilization apparatus according to an embodiment comprises a tubular portion, a base provided inside the tubular portion and equipped with a light source emitting ultraviolet light, a holder facing the base, a window provided between the base and the holder and transmitting the ultraviolet light emitted from the light source, and a seal portion having an annular shape and provided between the base and the window. A first recess in which the window is provided is formed at an end of the seal portion on a window side.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] SUMMARY OF THE INVENTION Embodiments of the present invention relate to a fluid sterilization device. [Background technology]

[0002] There are fluid sterilization devices that irradiate a fluid such as water with ultraviolet light to kill bacteria or inactivate viruses contained in the fluid. For example, a fluid sterilization device has been proposed that includes a tubular section through which the fluid flows, a light source provided inside the tubular section, and a window provided on the ultraviolet light emission side of the light source.

[0003] Here, the window is provided in a liquid-tight manner in a base in which a light source is provided. For example, the window is provided in a base in which an O-ring is provided using multiple bolts. Therefore, depending on the order in which the multiple bolts are fastened and the degree of fastening, the window may tilt, causing the corners of the window's periphery to interfere with the base. Furthermore, the pressure of the fluid supplied to the cylindrical portion may cause the window to bend, causing the corners of the window's periphery to interfere with the base. If the corners of the window's periphery interfere with the base, the corners of the window's periphery may be chipped.

[0004] Therefore, there has been a demand for the development of a fluid sterilizing device that can prevent chipping of the corners of the peripheral edge of the window. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-051290 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a fluid sterilizing device that can prevent chipping of the corners of the peripheral edge of the window. [Means for solving the problem]

[0007] A fluid sterilization device according to an embodiment includes a cylindrical portion, a base provided inside the cylindrical portion and equipped with a light source for irradiating ultraviolet light, a holder facing the base, a window provided between the base and the holder and transmitting the ultraviolet light irradiated from the light source, and an annular sealing portion provided between the base and the window. A first recess in which the window is to be disposed is provided at the end of the sealing portion on the window side. [Effects of the Invention]

[0008] According to an embodiment of the present invention, it is possible to provide a fluid sterilizing device that can prevent chipping of the corners of the peripheral edge of the window. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic perspective view illustrating a fluid sterilizing device according to an embodiment of the present invention. [Figure 2] 2 is a schematic cross-sectional view of the fluid sterilization device in FIG. 1 in a direction intersecting the central axis of the cylindrical portion. FIG. [Figure 3] FIG. 10 is a schematic cross-sectional view illustrating a sealing portion according to a comparative example. [Figure 4] 5A and 5B are schematic cross-sectional views illustrating an attachment state of the seal portion according to the present embodiment. [Figure 5] FIG. [Figure 6] 6 is a schematic cross-sectional view of the seal portion in FIG. 5 taken along line BB. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments will be illustrated with reference to the drawings. In each drawing, similar components are designated by the same reference numerals, and detailed explanations will be omitted as appropriate. In this specification, sterilization includes not only sterilization of bacteria but also inactivation of viruses. Furthermore, sterilization includes not only sterilization but also sterilization.

[0011] FIG. 1 is a schematic perspective view illustrating a fluid sterilizing device 1 according to this embodiment. FIG. 2 is a schematic cross-sectional view of the fluid sterilization device 1 in FIG. 1 in a direction intersecting the central axis of the tubular part 2. As shown in FIG. In FIG. 2, to avoid complexity, only the cylindrical portion 2, the supply portion 3, the discharge portion 4, the light source 5, the window 6, the holding portion 7, and the sealing portion 8 are shown.

[0012] As shown in FIGS. 1 and 2, the fluid sterilization device 1 includes, for example, a tube portion 2, a supply portion 3, a discharge portion 4, a light source 5, a window 6, a holding portion 7, a sealing portion 8, and a controller 9. For example, the light source 5, the window 6, the holding portion 7, and the sealing portion 8 can be provided inside the tubular portion 2. For example, the supply portion 3, the discharge portion 4, and the controller 9 can be provided outside the tubular portion 2.

[0013] The tubular portion 2 is, for example, cylindrical and has open ends. The tubular portion 2 is, for example, a cylindrical pipe. The openings at both ends of the tubular portion 2 are closed by lids 2a. The lids 2a can be detachably attached to flanges 2b provided on the side of the tubular portion 2 using bolts, for example. A sealing member 2c can be provided between the lid 2a and the flange 2b.

[0014] Ultraviolet light is irradiated from the light source 5 onto the inside of the tubular portion 2. In this case, if some of the irradiated ultraviolet light passes through the tubular portion 2 and leaks to the outside, the processing capacity of the fluid sterilization device 1 will decrease. For this reason, the tubular portion 2 can be made of a material that is not transparent to ultraviolet light and has a high reflectivity for ultraviolet light. Furthermore, the tubular portion 2 is preferably made of a material that is highly resistant to ultraviolet light and the fluid 301a to be sterilized. For example, the tubular portion 2 can be made of stainless steel. In this case, if the material of the tubular portion 2 is stainless steel containing 8 wt % or more of Ni (nickel), corrosion resistance to easily corrosive fluids 301a, such as seawater, can be improved.

[0015] If the cylindrical portion 2 contains a material with high reflectivity to ultraviolet rays, ultraviolet rays incident on the inner portion of the cylindrical portion 2 can be easily reflected toward the fluid 301a. This makes it possible to improve the efficiency of use of ultraviolet rays emitted from the light source 5. If the efficiency of use of ultraviolet rays can be improved, the number of light-emitting elements 51 and discharge lamps provided in the light source 5 can be reduced. Reducing the number of light-emitting elements 51 and discharge lamps allows for the light source 5 to be made smaller, less expensive, and more energy-efficient.

[0016] The interior of the tube portion 2 serves as a flow path for the fluid 301a to be sterilized. Therefore, the fluid 301a comes into contact with the inner surface of the tube portion 2. Here, the fluid 301a may be seawater, groundwater, or the like. Seawater, groundwater, or the like contains foreign matter such as sand, dead microorganisms, and inorganic salts. Therefore, when seawater, groundwater, or the like comes into contact with the inner surface of the tube portion 2, the foreign matter may adhere to the inner surface of the tube portion 2. If the foreign matter adheres to the inner surface of the tube portion 2, the reflectance of the ultraviolet light may decrease. If the reflectance decreases, the amount of reflected light (ultraviolet light) irradiated onto the fluid 301a decreases, which may reduce the sterilization effect.

[0017] Therefore, the surface roughness (arithmetic mean roughness) Ra of the inner part of the cylindrical part 2 is set to 50 nm (nanometers) or less, preferably 3 nm (nanometers) or more and 50 nm (nanometers) or less. This makes it possible to prevent foreign matter from adhering to the inner part of the cylindrical part 2 and improve the reflectance against ultraviolet light. For example, the inner part of the cylindrical part 2 may be buffed so that the surface roughness Ra of the inner part of the cylindrical part 2 falls within the above-mentioned range.

[0018] The tubular portion 2 can be mounted on a base 23 via, for example, a plurality of stands 22. The base 23 can be mounted on, for example, the floor of the location where the fluid sterilization device 1 is installed. However, the installation of the fluid sterilization device 1 is not limited to the example shown. For example, the fluid sterilization device 1 can also be mounted on a wall or ceiling of the installation location. Furthermore, although FIG. 1 illustrates a case where the tubular portion 2 extends vertically, the tubular portion 2 may extend horizontally or may extend in a direction inclined relative to the horizontal.

[0019] The supply unit 3 is provided on one end side of the cylindrical unit 2 . The supply unit 3 includes, for example, a supply pipe 31 , a flange 32 , and a seal member 33 .

[0020] The supply pipe 31 is, for example, a cylindrical pipe. For example, one end of the supply pipe 31 can be provided on the side of the cylindrical portion 2. The inside of the supply pipe 31 is in communication with the inside of the cylindrical portion 2. The material of the supply pipe 31 can be, for example, the same as the material of the cylindrical portion 2.

[0021] The flange 32 is plate-shaped and is provided at the end of the supply pipe 31 opposite to the cylindrical portion 2. A supply source of the fluid 301a can be connected to the flange 32 via a seal member 33.

[0022] The discharge portion 4 is provided on the other end side of the cylindrical portion 2. The discharge portion 4 includes, for example, a discharge pipe 41, a flange 42, and a seal member 43.

[0023] The discharge pipe 41 is, for example, a cylindrical pipe. For example, one end of the discharge pipe 41 can be provided on the side of the tubular portion 2. The inside of the discharge pipe 41 is in communication with the inside of the tubular portion 2. The material of the discharge pipe 41 can be, for example, the same as the material of the tubular portion 2.

[0024] Flange 42 is plate-shaped and is provided at the end of discharge pipe 41 opposite to the cylindrical portion 2. A tank or the like that stores sterilized fluid 301b can be connected to flange 42 via seal member 43.

[0025] The light source 5 irradiates the fluid 301a flowing inside the tubular portion 2 with ultraviolet light through the window 6. The light source 5 can be provided at least either near the supply unit 3 or near the discharge unit 4. The light source 5 illustrated in FIG. 2 is provided near both the supply unit 3 and the discharge unit 4. If the light source 5 is provided near both the supply unit 3 and the discharge unit 4, the amount of ultraviolet light irradiated onto the fluid 301a flowing inside the tubular portion 2 can be increased. This improves the sterilization effect. Furthermore, the area inside the tubular portion 2 that is irradiated with ultraviolet light can be increased. This allows the tubular portion 2 to maintain a predetermined sterilization effect even if the length of the tubular portion 2 in the direction along the central axis is increased, thereby improving the processing capacity.

[0026] If the light source 5 is provided either near the supply unit 3 or near the discharge unit 4, the configuration of the fluid sterilizer 1 can be simplified and manufacturing costs can be reduced. Therefore, the number of light sources 5 can be changed as appropriate depending on the required sterilization effect, processing capacity, manufacturing costs, and the like.

[0027] As shown in FIG. 2, the light source 5 includes, for example, a light emitting element 51, a substrate 52, a base 53, a stand 54, and a wiring pipe 55.

[0028] The light-emitting element 51 is provided on the surface of the substrate 52 facing the window 6. The light-emitting element 51 irradiates ultraviolet light toward the window 6. At least one light-emitting element 51 can be provided. The number of light-emitting elements 51 can be changed as appropriate depending on the processing capacity required of the fluid sterilization device 1. When multiple light-emitting elements 51 are provided, the multiple light-emitting elements 51 can be connected in series.

[0029] There are no particular limitations on the light emitting element 51 as long as it is an element that irradiates ultraviolet light. The light emitting element 51 can be, for example, a light emitting diode or a laser diode.

[0030] The peak wavelength of the ultraviolet light emitted from the light-emitting element 51 is not particularly limited as long as it has a sterilizing effect. However, if the peak wavelength is 300 nm or less, the ultraviolet light can be easily absorbed by the DNA or RNA of bacteria or viruses. Therefore, it is preferable that the light-emitting element 51 be a light-emitting diode that emits ultraviolet light with a peak wavelength of 200 nm to 300 nm, for example.

[0031] The substrate 52 has a plate shape and can be provided on the bottom surface of a recess 53b of the base 53, which will be described later. A wiring pattern can be provided on the substrate 52. The material of the substrate 52 is preferably one that is resistant to ultraviolet rays. The material of the substrate 52 can be, for example, ceramics such as aluminum oxide. The substrate 52 can also be a metal core substrate in which the surface of a metal plate is covered with an inorganic material. If the material of the substrate 52 is ceramics or the like, or if the substrate 52 is a metal core substrate, it can achieve resistance to ultraviolet rays and high heat dissipation properties.

[0032] When viewed from a direction along the central axis of the tubular portion 2, the outline shape of the base 53 is, for example, a circle. The base 53 has, for example, a plate shape. The end of the base 53 on the window 6 side is provided with a recess 53a (corresponding to an example of a second recess) in which the seal portion 8 is provided, and a recess 53b in which the light source 5 is provided. The recess 53b can be provided in a central region of the base 53. The recess 53a is provided outside the recess 53b and surrounds the recess 53b.

[0033] A substrate 52 on which the light emitting element 51 is mounted can be provided inside the recess 53b. The base 53 has the function of holding the substrate 52 on which the light emitting element 51 is mounted and the function of dissipating heat generated in the light emitting element 51 to the outside. Therefore, the base 53 is preferably made of a material with high thermal conductivity. The base 53 can be made of, for example, an aluminum alloy, stainless steel, or other metal.

[0034] Although the light source 5 has been described above as including a light-emitting element 51 that irradiates ultraviolet light, the light source 5 is not limited to this. For example, the light source 5 may be one that includes a discharge lamp that irradiates ultraviolet light. For example, the light source 5 may also be one that includes a low-pressure mercury lamp or a barrier discharge lamp. In this case, the discharge lamp may be, for example, a low-pressure mercury lamp that irradiates ultraviolet light with a peak wavelength of 254 nm, or a low-pressure mercury lamp that irradiates ultraviolet light with peak wavelengths of 185 nm and 254 nm.

[0035] That is, the base 53 can be provided inside the cylindrical portion 2, and the light source 5 that irradiates ultraviolet light can be provided therein.

[0036] The stand 54 is provided between the base 53 and the lid 2a, and supports the base 53, the light source 5, the window 6, the holding portion 7, and the sealing portion 8 inside the cylindrical portion 2. The stand 54 is rod-shaped and extends in a direction along the central axis of the cylindrical portion 2. At least one stand 54 can be provided. The stand 54 can be made of a metal such as an aluminum alloy or stainless steel, for example.

[0037] The wiring pipe 55 is provided between the base 53 and the lid 2a. The wiring pipe 55 is cylindrical and extends in a direction along the central axis of the tubular portion 2. Wiring electrically connected to the light source 5 passes through the inside of the wiring pipe 55 and is drawn out from the lid 2a to the outside of the fluid sterilization device 1. The wiring pipe 55 can also function as the stand 54. In this case, the number of stands 54 can be reduced or the stand 54 can be omitted. The wiring pipe 55 can be made of metal such as an aluminum alloy or stainless steel, for example.

[0038] The controller 9 controls the turning on and off of the light emitting element 51. If the light source 5 includes a discharge lamp, the controller 9 controls the turning on and off of the discharge lamp. The controller 9 may include, for example, a lighting circuit and a power supply. As shown in FIG. 1, the controller 9 may be provided in the cylindrical portion 2, for example. The controller 9 may also be provided in a position separated from the cylindrical portion 2. A terminal block 9a electrically connected to the controller 9 and the light source 5 may also be provided.

[0039] The window 6 is plate-shaped and is provided between the base 53 and the holder 71 via the seal portion 8 and the sheet 72. The window 6 is provided on the side of the base 53 where the recesses 53a and 53b open. A seal portion 8 is provided between the vicinity of the periphery of the window 6 and the bottom surface of the recess 53a of the base 53. The opening of the recess 53b is sealed by the window 6 and the seal portion 8 so as to be liquid-tight. The details of the seal portion 8 will be described later.

[0040] The window 6 faces the light source 5. A space may be provided between the window 6 and the light source 5. The window 6 is made of a material that can transmit ultraviolet light emitted from the light source 5 and is resistant to ultraviolet light and the fluid 301a. The window 6 is made of, for example, quartz glass or a fluororesin that transmits ultraviolet light.

[0041] Ultraviolet light emitted from the light source 5 is irradiated onto the fluid 301a flowing inside the tubular portion 2 through the window 6. A portion of the ultraviolet light irradiated onto the inside of the tubular portion 2 is reflected by the inner part of the tubular portion 2, and the reflected ultraviolet light is irradiated onto the fluid 301a. Therefore, the fluid 301a flowing inside the tubular portion 2 is sterilized by the ultraviolet light.

[0042] In this case, an anti-reflection film can be provided on the surface of the window 6 facing the light source 5. If an anti-reflection film is provided, it is possible to prevent the ultraviolet light emitted from the light source 5 from being reflected by the window 6 and becoming less irradiated onto the fluid 301a. In other words, it is possible to improve the utilization efficiency of the ultraviolet light emitted from the light source 5.

[0043] In addition, an anti-fouling film can be provided on the surface of the window 6 opposite the light source 5 side (the surface that comes into contact with the fluid 301a). As described above, the fluid 301a may contain foreign matter. If foreign matter adheres to the window 6, it becomes difficult for the ultraviolet light irradiated from the light source 5 to pass through the window 6. If an anti-fouling film is provided, it is possible to prevent foreign matter from adhering to the window 6.

[0044] The holding portion 7 holds the window 6 . As shown in FIG. 2, the holding portion 7 includes, for example, a holder 71 and a sheet 72.

[0045] The holder 71 faces the base 53. A hole 71a is provided in the central portion of the holder 71, penetrating the holder 71 in the thickness direction. A window 6 is exposed inside the hole 71a. When viewed from the direction along the central axis of the tubular portion 2, the shape of the holder 71 is, for example, a ring. When viewed from the direction along the central axis of the tubular portion 2, the outer diameter of the holder 71 can be, for example, approximately the same as the outer diameter of the base 53.

[0046] Holder 71 is provided on the side of base 53 where recesses 53a and 53b are open. For example, holder 71 is detachably attached to base 53 using a plurality of bolts. In this case, if the heads of the plurality of bolts protrude from the end of holder 71 opposite to the base 53 side, ultraviolet light irradiated through window 6 is more likely to be incident on the heads of the plurality of bolts. When ultraviolet light irradiated through window 6 is incident on the heads of the plurality of bolts, the amount of ultraviolet light irradiated on fluid 301a is reduced accordingly.

[0047] Therefore, the heads of the plurality of bolts are located inside holder 71. If the heads of the plurality of bolts are located inside holder 71, it is possible to prevent ultraviolet light irradiated through window 6 from being incident on the heads of the plurality of bolts, and therefore it is possible to prevent a decrease in the amount of ultraviolet light irradiated onto fluid 301a. The bolts that attach holder 71 can be, for example, hexagon socket bolts, cross recess bolts, flat-head bolts, etc.

[0048] The holder 71 has a recess 71b that opens to the surface facing the base 53. A hole 71a opens to the bottom surface of the recess 71b. A sheet 72 and a window 6 are provided inside the recess 71b. The holder 71 presses the window 6 against the base 53 via the sheet 72 and the seal portion 8. The holder 71 is made of a metal such as an aluminum alloy or stainless steel.

[0049] The sheet 72 is plate-shaped and is provided between the holder 71 and the window 6. The sheet 72 protects the window 6 and provides a liquid-tight seal between the holder 71 and the window 6. When viewed from the direction along the central axis of the cylindrical portion 2, the shape of the sheet 72 is, for example, a ring. The window 6 is exposed on the inside of the sheet 72. When viewed from the direction along the central axis of the cylindrical portion 2, the outer diameter of the sheet 72 can be slightly smaller than the inner diameter of the recess 71b of the holder 71. The sheet 72 is made of a soft material that is resistant to ultraviolet light and the fluid 301a. The sheet 72 is made of, for example, a silicone resin or a fluororesin.

[0050] Next, the seal portion 8 will be further described. FIG. 3 is a schematic cross-sectional view illustrating a seal portion 208 according to a comparative example. As shown in FIG. 3 , the substrate 52 on which the light-emitting element 51 is mounted is provided on the bottom surface of a recess 253b provided in the central region of the base 253. A window 6 is provided on the side of the base 253 where the recess 253b opens. A seal portion 208 is provided on the end of the base 253 where the recess 253b opens. The seal portion 208 is provided inside the recess 253a that surrounds the opening of the recess 253b. The seal portion 208 can be an O-ring. The holder 71 presses the window 6 against the base 253 via the sheet 72 and the seal portion 208. In this way, the seal portion 208 can provide a liquid-tight seal between the vicinity of the periphery of the window 6 and the base 253.

[0051] Here, the holder 71 is detachably attached to the base 253 using a plurality of bolts. Therefore, depending on the order in which the plurality of bolts are fastened and the degree of fastening, the window 6 may tilt, causing the corners of the periphery of the window 6 to interfere with the base 253. Furthermore, the pressure of the fluid 301a supplied to the cylindrical portion 2 may cause the window 6 to bend, causing the corners of the periphery of the window 6 to interfere with the base 253. If the corners of the periphery of the window 6 interfere with the base 253, the corners of the periphery of the window 6 may be chipped.

[0052] 4 is a schematic cross-sectional view illustrating the attached state of the seal portion 8 according to this embodiment. Note that FIG. 4 is a schematic enlarged view of part A in FIG. FIG. 5 is a schematic perspective view of the seal portion 8. As shown in FIG. FIG. 6 is a schematic cross-sectional view of the seal portion 8 in FIG. 5 taken along the line BB.

[0053] 4 and 5, the sealing portion 8 has, for example, an annular shape and is provided between the base 53 and the window 6. The sealing portion 8 is provided inside a recess 53a of the base 53 that surrounds the opening of the recess 53b.

[0054] 4 to 6, a recess 8a (corresponding to an example of a first recess) in which the window 6 is provided is provided at the end of the seal portion 8 on the window 6 side. The surface of the window 6 on the light source 5 side is in contact with the bottom surface of the recess 8a. The side of the window 6 may be in contact with the side of the recess 8a, or a gap may be provided between the side of the window 6 and the side of the recess 8a. However, if the side of the window 6 is in contact with the side of the recess 8a, the window 6 can be held and positioned more reliably, and the gap between the window 6 and the seal portion 8 can be sealed more liquid-tightly.

[0055] In this case, a gap can be provided between the side of the seal portion 8 and the side of the recess 53a of the base 53. For example, a gap can be provided at least between the inner side of the seal portion 8 and the inner side of the recess 53a of the base 53, and between the outer side of the seal portion 8 and the outer side of the recess 53a of the base 53. In the example shown in FIG. 4, a gap is provided between the inner side of the seal portion 8 and the inner side of the recess 53a of the base 53, and between the outer side of the seal portion 8 and the outer side of the recess 53a of the base 53. Furthermore, for example, as shown in FIG. 4, a gap can also be provided between the outer side of the seal portion 8 and the inner side of the holder 71.

[0056] As described above, the holder 71 presses the window 6 toward the base 53 via the sheet 72 and the seal portion 8. At this time, the seal portion 8 sandwiched between the window 6 and the base 53 deforms so as to protrude radially inward and outward. Therefore, if a gap is provided between the side of the seal portion 8 and the side of the recess 53a of the base 53, the seal portion 8 can be easily deformed when the window 6 is pressed toward the base 53. Furthermore, if a gap is also provided between the outer side of the seal portion 8 and the inner side of the holder 71, the seal portion 8 can be easily deformed when the window 6 is pressed toward the base 53. If the seal portion 8 can be easily deformed, it becomes easier to bring the window 6 into close contact with the seal portion 8, which in turn makes it easier to achieve a liquid-tight seal between the window 6 and the seal portion 8.

[0057] Furthermore, a sloped portion may be provided between the side of the seal portion 8 and the end of the seal portion 8 on the base 53 side. In this case, a sloped portion 8b may be provided between the inner side of the seal portion 8 and the end of the seal portion 8 on the base 53 side. A sloped portion 8c may be provided between the outer side of the seal portion 8 and the end of the seal portion 8 on the base 53 side. At least one of the sloped portion 8b and the sloped portion 8c may be provided. The seal portion 8 illustrated in FIGS. 4 and 6 is provided with the sloped portion 8b and the sloped portion 8c.

[0058] The inclined portion 8b is inclined in a direction away from the base 53 toward the inner side of the seal portion 8. Although the inclined portion 8b is inclined linearly in the illustrated example, the inclined portion 8b may be in a stepped shape.

[0059] The inclined portion 8c is inclined in a direction away from the base 53 toward the outer side of the seal portion 8. Although the inclined portion 8c is inclined linearly in the illustrated example, the inclined portion 8c may be in a stepped shape.

[0060] Providing at least one of the inclined portions 8b and 8c can reduce the contact area between the end of the seal portion 8 on the base 53 side and the bottom surface of the recess 53a. This allows the seal portion 8 to be easily deformed when the window 6 is pressed against the base 53. Furthermore, as the deformation of the seal portion 8 progresses, at least one of the inclined portions 8b and 8c comes into contact with the bottom surface of the recess 53a. In other words, providing at least one of the inclined portions 8b and 8c can facilitate the deformation of the seal portion 8 and increase the contact area between the seal portion 8 and the base 53. This makes it easier to bring the seal portion 8 into close contact with the base 53, which in turn makes it easier to achieve a liquid-tight seal between the seal portion 8 and the base 53.

[0061] The seal portion 8 is made of a material that is highly resistant to ultraviolet light and the fluid 301a and that is deformable when the window 6 is pressed against the base 53. The seal portion 8 can be made of, for example, a fluororesin.

[0062] Although several embodiments of the present invention have been described above, these embodiments are presented by way of example only 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, modifications, etc. 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, as well as within the scope of the invention and its equivalents as set forth in the claims. Furthermore, the above-described embodiments can be implemented in combination with each other. [Explanation of symbols]

[0063] 1 Fluid sterilization device, 2 Cylinder part, 5 Light source, 6 Window, 7 Holding part, 8 Sealing part, 8a Recess, 8b Inclined part, 8c Inclined part, 51 Light emitting element, 53 Base, 53a Recess, 71 Holder, 72 Sheet, 301a Fluid

Claims

1. a cylindrical portion; a base provided inside the cylindrical portion and including a light source for irradiating ultraviolet light; a holder facing the base; a window provided between the base and the holder, the window transmitting the ultraviolet light irradiated from the light source; a seal portion having an annular shape and provided between the base and the window; Equipped with A fluid sterilization device, wherein a first recess in which the window is provided is provided at the end of the sealing portion on the window side.

2. an inclined portion is provided between a side portion of the sealing portion and an end portion of the sealing portion on the base side; The fluid sterilizer according to claim 1 , wherein the inclined portion is inclined in a direction away from the base toward the side of the sealing portion.

3. a second recess in which the sealing portion is provided is provided at an end of the base on the window side; 3. The fluid sterilizer according to claim 1, wherein a gap is provided between a side of the seal portion and a side of the second recess.

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