Light source and fluid ultraviolet light treatment device

Abstract

To provide a fluid ultraviolet light treatment device that can enhance treatment effect.SOLUTION: The fluid ultraviolet light treatment device has a fluid inflow part and an outflow part, and a flow path part that connects the inflow part and the outflow part, and in which the flow path part includes a plurality of branch flow path parts branching from the inflow part, and a converging flow path part connected to the downstream side of the plurality of branch flow path parts, and the device includes a first light source capable of irradiating ultraviolet light to the converging flow path part, and a plurality of second light sources capable of irradiating ultraviolet light to each of the plurality of branch flow path parts.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a light source and a fluid ultraviolet light treatment device. [Background technology]

[0002] For example, Patent Document 1 discloses a device that irradiates ultraviolet light emitted by a light-emitting element into a flow path through which a fluid flows. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-140001 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide an ultraviolet light treatment device for fluid that can improve the treatment effect. [Means for solving the problem]

[0005] According to one aspect of the present invention, a fluid ultraviolet light treatment device has an inlet and outlet for a fluid, and a flow path section connecting the inlet and outlet, the flow path section including a plurality of branch flow path sections branching from the inlet section and a confluence flow path section connected downstream of the plurality of branch flow path sections, and is equipped with a first light source capable of irradiating ultraviolet light onto the confluence flow path section, and a plurality of second light sources capable of irradiating ultraviolet light onto each of the plurality of branch flow path sections. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide an ultraviolet light treatment device for fluid that can improve the treatment effect. [Brief explanation of the drawings]

[0007] [Figure 1]1 is a perspective view of a fluid ultraviolet light treatment apparatus according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 4 is a cross-sectional view of a fluid ultraviolet light treatment apparatus according to a second embodiment of the present invention. [Figure 4A] FIG. 1 is a perspective view illustrating an example of a light source according to an embodiment of the present invention. [Figure 4B] FIG. 2 is a perspective view showing another example of a light source according to an embodiment of the present invention. [Figure 5] FIG. 10 is a perspective view showing another example of a light source according to an embodiment of the present invention. [Figure 6] FIG. 6 is an exploded perspective view of the light source shown in FIG. 5. [Figure 7] 1 is a cross-sectional view of a fluid ultraviolet light treatment device showing a first example of a fluid retention effect. [Figure 8] FIG. 1 is a perspective view of a fluid ultraviolet light treatment device showing a first example of a fluid retention effect. [Figure 9] FIG. 10 is a cross-sectional view of a fluid ultraviolet light treatment device showing a second example of the fluid retention effect. [Figure 10] FIG. 10 is a cross-sectional view of a fluid ultraviolet light treatment device showing a third example of a fluid retention effect. [Figure 11] FIG. 10 is a cross-sectional view of a fluid ultraviolet light treatment device showing a fourth example of a fluid retention effect. [Figure 12] FIG. 10 is a cross-sectional view of a fluid ultraviolet light treatment device showing a fifth example of a fluid retention effect. [Figure 13] FIG. 10 is a cross-sectional view of a fluid ultraviolet light treatment device showing a sixth example of a fluid retention effect. [Figure 14] FIG. 11 is a side view of a fluid ultraviolet light treatment device showing a seventh example of a fluid retention effect, viewed from the inflow side. [Figure 15] FIG. 15 is a cross-sectional view taken along line XV-XV in FIG. [Figure 16] FIG. 16 is a cross-sectional view taken along line XVI-XVI in FIG. [Figure 17] FIG. 10 is a cross-sectional view of a fluid ultraviolet light treatment apparatus according to a third embodiment of the present invention. [Figure 18] FIG. 10 is a cross-sectional view of a fluid ultraviolet light treatment apparatus according to a fourth embodiment of the present invention. [Figure 19] 10A and 10B are diagrams illustrating partition members included in an ultraviolet light treatment apparatus for fluid according to a fifth embodiment of the present invention. [Figure 20] FIG. 13 is a perspective view illustrating a photodetector provided in a light source of a fluid ultraviolet light treatment apparatus according to a sixth embodiment of the present invention. [Figure 21] FIG. 21 is a first diagram illustrating the operation of the photodetector of FIG. 20; [Figure 22] FIG. 21 is a second diagram illustrating the operation of the photodetector of FIG. 20; DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments will be described with reference to the drawings. In each drawing, the same components are denoted by the same reference numerals. Note that, since each drawing is a schematic illustration of the embodiment, the scale, spacing, or positional relationship of each component may be exaggerated, or some components may be omitted.

[0009] [First embodiment] Fig. 1 is a perspective view of a fluid ultraviolet light treatment device 1 according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. In Fig. 1 and Fig. 2, three mutually orthogonal axes are designated as the X-axis, Y-axis, and Z-axis. The cross section shown in Fig. 2 is parallel to the X-axis and Z-axis and orthogonal to the Y-axis.

[0010] The fluid ultraviolet light treatment device 1 has a first end 10, a second end 20, and an intermediate portion 50 located between the first end 10 and the second end 20. The fluid ultraviolet light treatment device 1 further has a first light source 71 and a second light source 72. In the example shown in FIGS. 1 and 2 , the first light source 71 is disposed at the first end 10, and the second light source 72 is disposed at the second end 20.

[0011] The first end portion 10, the second end portion 20, and the intermediate portion 50 are made of a metal, such as stainless steel. The first end portion 10, the second end portion 20, and the intermediate portion 50 may be separate from each other or may be integrally formed.

[0012] 2, the flow of a fluid is indicated by thick arrows. A fluid such as a liquid or gas flows into the first end 10 from outside the fluid ultraviolet light treatment device 1. The fluid then flows from the first end 10 through the middle section 50 to the second end 20, and then flows out of the fluid ultraviolet light treatment device 1 from the second end 20.

[0013] The first end portion 10 has an inlet portion 11 for a fluid, an upstream flow path portion 12, a first light source placement portion 13, and a first window portion 14.

[0014] The inlet section 11 includes a hole that leads from the outside of the fluid ultraviolet light treatment device 1 to the inside of the first end section 10. An external pipe is connected to the inlet section 11, and the fluid flows into the inlet section 11 from the pipe. The cross section of the inlet section 11 perpendicular to the direction of fluid flow has, for example, a circular shape. The inlet section 11 has, for example, an inlet port 11a formed as a circular opening. A central axis C1 passing through the center of the circular cross section of the inlet section 11 is parallel to the X-axis direction.

[0015] The upstream flow path section 12 is connected to the inlet section 11 inside the first end section 10. The upstream flow path section 12 branches into multiple sections from the inlet section 11. In the example shown in Fig. 2, the upstream flow path section 12 branches into two sections from the inlet section 11. For example, the upstream flow path sections 12 branch off from the inlet section 11 in opposite directions in the Z-axis direction perpendicular to the central axis C1.

[0016] The first light source arrangement section 13 is formed as a space within the first end section 10 in which the first light source 71 can be arranged. As shown in FIG. 1 , a first opening 13a communicating with the first light source arrangement section 13 is formed in one side surface 10a of the first end section 10. The first light source 71 can be attached to and detached from the first light source arrangement section 13 through this first opening 13a. The first light source arrangement section 13 is formed as a space separated from each flow path section of the fluid ultraviolet light treatment device 1, and the first light source 71 is not exposed to the fluid and is protected from the fluid. For example, if the fluid is a liquid, a waterproof structure is not required for the first light source 71. Furthermore, the first light source 71 can be attached and detached for replacement or maintenance while the fluid is still flowing through the fluid ultraviolet light treatment device 1. The first light source arrangement section 13 may be disposed within the intermediate section 50. In this case, the first opening 13a communicating with the first light source arrangement section 13 is formed in a third wall section 53 or a fourth wall section 54 of the intermediate section 50, which will be described later.

[0017] The first light source 71 emits ultraviolet light. The peak wavelength of the ultraviolet light emitted by the first light source 71 is, for example, 10 nm or more and 400 nm or less. The first light source 71 includes a light-emitting element. For example, an LED (Light Emitting Diode) or an LD (Laser Diode) can be used as the light-emitting element. The first light source 71 can be a light-emitting device in which a light-emitting element is mounted on a wiring board or the like, or a light-emitting device in which a housing including a light-emitting element is mounted on a wiring board or the like. The first light source 71 has a first surface 71a and a second surface 71b located on the opposite side of the first surface 71a. The first surface 71a is a light-emitting surface, and the ultraviolet light is emitted from the first surface 71a.

[0018] A first window portion 14 is disposed facing a first surface 71a of the first light source 71. In the X-axis direction, the first surface 71a is located between the first window portion 14 and a second surface 71b of the first light source 71, and a portion of the upstream flow path portion 12 is located between the second surface 71b and the inlet portion 11. The first window portion 14 is made of a material that is translucent to the wavelength of light emitted by the first light source 71. Examples of materials for the first window portion 14 include inorganic materials made of at least one type selected from the group consisting of quartz glass, borosilicate glass, calcium fluoride glass, aluminoborosilicate glass, oxynitride glass, chalcogenide glass, and sapphire.

[0019] The second end 20 has a fluid outlet 15 , a second light source placement section 16 , and a second window section 17 .

[0020] The outflow section 15 includes a hole that leads from the inside of the second end 20 to the outside of the fluid ultraviolet light treatment device 1. An external pipe is connected to the outflow section 15. The fluid that has flowed inside the fluid ultraviolet light treatment device 1 flows out from the outflow section 15 to the external pipe. The cross section of the outflow section 15 perpendicular to the direction of fluid flow has, for example, a circular shape. The outflow section 15 has, for example, an outlet 15a formed as a circular opening.

[0021] It is preferable that the central axis C2 passing through the center of the circular cross-sectional shape of the outlet portion 15 coincides with the central axis C1 of the inlet portion 11. This allows the fluid ultraviolet light treatment device 1 to be easily connected to the middle of an existing straight pipe.

[0022] The second light source arrangement section 16 is formed as a space inside the second end section 20 in which the second light source 72 can be arranged. A plurality of second light sources 72 are arranged inside the second end section 20. In this embodiment, for example, two second light sources 72 are arranged inside the second end section 20. Therefore, two second light source arrangement sections 16 are formed inside the second end section 20. The two second light source arrangement sections 16 are positioned so as to sandwich the outflow section 15 in the Z-axis direction.

[0023] As shown in FIG. 1 , a second opening 16a communicating with each second light source arrangement portion 16 is formed on one side surface 20a of the second end portion 20. The second light source 72 can be attached to and detached from the second light source arrangement portion 16 through this second opening 16a. The second light source arrangement portion 16 is formed as a space separated from each flow path portion of the fluid ultraviolet light treatment device 1, and the second light source 72 is not exposed to the fluid and is protected from the fluid. For example, if the fluid is a liquid, the second light source 72 does not need to be waterproof. Furthermore, the second light source 72 can be attached and detached for replacement or maintenance while the fluid is still flowing through the fluid ultraviolet light treatment device 1. The second light source arrangement portion 16 may be disposed inside the intermediate portion 50. In this case, the second opening 16a communicating with the second light source arrangement portion 16 is formed in a third wall portion 53 or a fourth wall portion 54 of the intermediate portion 50, which will be described later.

[0024] The second light source 72 emits ultraviolet light. The same light source as the first light source 71 can be used as the second light source 72. The second light source 72 may have a different emission peak wavelength from that of the first light source 71. The second light source 72 also has a first surface 72a and a second surface 72b located on the opposite side of the first surface 72a. The first surface 72a is a light emission surface, and the ultraviolet light is emitted from the first surface 72a.

[0025] A second window portion 17 is disposed facing the first surface 72a of each second light source 72. The second window portion 17 is made of a material that is translucent to the wavelength of light emitted by the second light source 72. The second window portion 17 is made of, for example, glass. In the X-axis direction, the first surface 72a is located between the second window portion 17 and the second surface 72b of the second light source 72.

[0026] As shown in FIG. 1 , the second light source 72 includes, for example, a wiring board 72d, a plurality of light-emitting elements 72e mounted on the wiring board 72d, and a housing 72f that covers the wiring board 72d and the light-emitting elements 72e. The housing 72f is formed with a connector insertion port 72c that is electrically connected to the wiring board 72d. The first light source 71 may be configured similarly to the second light source 72. The first light source 71 and the second light source 72 may have a waterproof structure. In this case, the first light source mounting section 13 and the second light source mounting section 16 may be disposed within the flow path section 100 of the fluid ultraviolet light treatment device 1. Alternatively, the translucent members constituting the first window section 14 and the second window section 17 may be omitted, and ultraviolet light from the first light source 71 and the second light source 72 may be directly irradiated into the flow path section 100 through the first light source mounting section 13 and the second light source mounting section 16.

[0027] The second end 20 further has a downstream flow path section 110. The downstream flow path section 110 branches from the outflow section 15 in the Z-axis direction and communicates with a space facing the second light source placement section 16. A portion of the fluid flowing through the outflow section 15 branches off and flows into the downstream flow path section 110, thereby cooling the second light source 72 from the second surface 72b side. This makes it possible to suppress a decrease in luminous efficiency due to heat generated by the light emission of the second light source 72.

[0028] Furthermore, the fluid flowing through the upstream flow path portion 12 of the first end portion 10 can cool the first light source 71 from the second surface 71b side, thereby suppressing a decrease in luminous efficiency due to heat generated by the light emission of the first light source 71.

[0029] 1, the intermediate unit 50 has four walls (a first wall 51, a second wall 52, a third wall 53, and a fourth wall 54) that form the housing of the intermediate unit 50. The first wall 51 and the second wall 52 are spaced apart from each other in the Z-axis direction. The third wall 53 and the fourth wall 54 are spaced apart from each other in the Y-axis direction.

[0030] Furthermore, the intermediate section 50 has a plurality of partition members 61 to 64 arranged in a space surrounded by the first wall section 51, the second wall section 52, the third wall section 53, and the fourth wall section 54. For example, four partition members (the first partition member 61, the second partition member 62, the third partition member 63, and the fourth partition member 64) are arranged in the intermediate section 50.

[0031] The first partitioning member 61, the second partitioning member 62, the third partitioning member 63, and the fourth partitioning member 64 are rectangular plate members extending in the X-axis direction. The first wall portion 51, the first partitioning member 61, the second partitioning member 62, the third partitioning member 63, the fourth partitioning member 64, and the second wall portion 52 are spaced apart from each other in the Z-axis direction. The first flow path portions 81a, 81b, the second flow path portions 82a, 82b, and the merging flow path portion 90 may each be composed of a cylindrical member.

[0032] In the Z-axis direction, the first partition member 61 is located between the first wall portion 51 and the second partition member 62, the second partition member 62 is located between the first partition member 61 and the third partition member 63, the third partition member 63 is located between the second partition member 62 and the fourth partition member 64, and the fourth partition member 64 is located between the third partition member 63 and the second wall portion 52.

[0033] The first partitioning member 61, the second partitioning member 62, the third partitioning member 63, and the fourth partitioning member 64 are sandwiched between the third wall portion 53 and the fourth wall portion 54 in the Y-axis direction. Both end portions in the Y-axis direction of the first partitioning member 61, the second partitioning member 62, the third partitioning member 63, and the fourth partitioning member 64 are supported by the third wall portion 53 and the fourth wall portion 54.

[0034] One end of the first partition member 61 is connected to the first end 10, and the first partition member 61 extends from the connection with the first end 10 toward the second end 20. The other end of the first partition member 61 is spaced apart from the second end 20.

[0035] One end of the second partition member 62 is connected to the second end portion 20, and the second partition member 62 extends from the connection portion with the second end portion 20 toward the first end portion 10. The other end of the second partition member 62 is spaced apart from the first end portion 10.

[0036] One end of the third partitioning member 63 is connected to the second end 20, and the third partitioning member 63 extends from the connection with the second end 20 toward the first end 10. The other end of the third partitioning member 63 is spaced apart from the first end 10.

[0037] One end of the fourth partition member 64 is connected to the first end 10, and the fourth partition member 64 extends from the connection with the first end 10 toward the second end 20. The other end of the fourth partition member 64 is spaced apart from the second end 20.

[0038] The intermediate section 50 connects the inlet section 11 and the outlet section 15 and has a flow path section 100 defined by the walls 51-54 and the partition members 61-64. The flow path section 100 has a plurality of branch flow path sections 80a, 80b branching off from the inlet section 11, and a junction flow path section 90 connected downstream of the plurality of branch flow path sections 80a, 80b. In the example shown in Fig. 1, for example, the two branch flow path sections 80a, 80b are positioned on either side of the junction flow path section 90 in the Z-axis direction.

[0039] At least one of the branched flow path sections 80a, 80b has first flow path sections 81a, 81b and second flow path sections 82a, 82b. In the example shown in Fig. 1, each of the two branched flow path sections 80a, 80b has a first flow path section 81a, 81b and a second flow path section 82a, 82b.

[0040] One branch flow path section 80a has a first flow path section 81a and a second flow path section 82a. The first flow path section 81a is disposed upstream of the second flow path section 82a, and the second flow path section 82a is disposed downstream of the first flow path section 81a. The upstream side refers to the side relatively closer to the inlet section 11 in the flow path extending from the inlet section 11 to the outlet section 15, and the downstream side refers to the side relatively closer to the outlet section 15.

[0041] The other branch flow path section 80b has a first flow path section 81b and a second flow path section 82b. The first flow path section 81b is disposed upstream of the second flow path section 82b, and the second flow path section 82b is disposed downstream of the first flow path section 81b.

[0042] A first flow path section 81a of one branch flow path section 80a is defined by the first wall section 51, the first partition member 61, the third wall section 53, and the fourth wall section 54. A second flow path section 82a of the other branch flow path section 80a is defined by the first partition member 61, the second partition member 62, the third wall section 53, and the fourth wall section 54.

[0043] A first flow path section 81b of the other branch flow path section 80b is defined by the second wall section 52, the fourth partition member 64, the third wall section 53, and the fourth wall section 54. A second flow path section 82b of the other branch flow path section 80b is defined by the third partition member 63, the fourth partition member 64, the third wall section 53, and the fourth wall section 54.

[0044] One end of each of the first flow path sections 81a, 81b is connected to an upstream flow path section 12 formed inside the first end section 10. The first flow path sections 81a, 81b extend in a first direction d1 from the connection section with the upstream flow path section 12. The first direction d1 is, for example, a direction parallel to the X-axis direction. The fluid flows through each of the first flow path sections 81a, 81b in the first direction d1. The first direction d1 may also be a direction inclined with respect to the X-axis direction.

[0045] The first flow path section 81a of one branch flow path section 80a is connected to the second flow path section 82a through the space between the first partition member 61 and the second end section 20, and the first flow path section 81b of the other branch flow path section 80b is connected to the second flow path section 82b through the space between the fourth partition member 64 and the second end section 20.

[0046] Each of the second flow path sections 82a, 82b extends from a portion communicating with the first flow path sections 81a, 81b in a direction different from the first direction d1, and the fluid flows through each of the second flow path sections 82a, 82b in a second direction d2. In this embodiment, the second direction d2 is the opposite direction to the first direction d1.

[0047] The first flow path portions 81a, 81b, the second flow path portions 82a, 82b, and the confluence flow path portion 90 are disposed adjacent to one another in the Z-axis direction. The first flow path portion 81a of one branch flow path portion 80a is adjacent to the second flow path portion 82a of one branch flow path portion 80a via the first partition member 61. The first flow path portion 81b of the other branch flow path portion 80b is adjacent to the second flow path portion 82b of the other branch flow path portion 80b via the fourth partition member 64. The confluence flow path portion 90 is adjacent to the second flow path portion 82a of one branch flow path portion 80a via the second partition member 62, and adjacent to the second flow path portion 82b of the other branch flow path portion 80b via the third partition member 63. In the Z-axis direction, the two second flow path portions 82a, 82b are located between the two first flow path portions 81a, 81b, and the confluence flow path portion 90 is located between the two second flow path portions 82a, 82b.

[0048] The second flow path portion 82a of one branch flow path portion 80a is connected to the confluence flow path portion 90 through the space between the second partition member 62 and the first end portion 10. The second flow path portion 82b of the other branch flow path portion 80b is connected to the confluence flow path portion 90 through the space between the third partition member 63 and the first end portion 10. The confluence flow path portion 90 extends in the X-axis direction from a portion communicating with the two second flow path portions 82a, 82b and is connected to the outlet portion 15. The fluids that have flowed through the second flow path portions 82a, 82b are merged into the confluence flow path portion 90 and flow through the confluence flow path portion 90 in the first direction d1.

[0049] The first light source 71 is disposed at a position where it can irradiate ultraviolet light onto the confluent flow path section 90. For example, the first light source 71 is disposed in a first light source arrangement section 13 formed at the first end section 10, and a first surface (light emission surface) 71a of the first light source 71 faces the confluence of the two second flow path sections 82a, 82b in the confluent flow path section 90 via a first window section 14. The ultraviolet light emitted from the first surface 71a of the first light source 71 is irradiated onto the confluent flow path section 90 from the confluence side with the second flow path sections 82a, 82b.

[0050] One or more second light sources 72 are arranged at positions where they can irradiate one branch flow path section with ultraviolet light. In the example shown in FIG. 2, each second light source 72 is arranged at a position where it can irradiate each branch flow path section 80a, 80b with ultraviolet light. For example, the second light source 72 is arranged in a second light source arrangement section 16 formed at the second end section 20. At least one of the two second light sources 72 is arranged at a position where it can irradiate the first flow path sections 81a, 81b and the second flow path sections 82a, 82b with ultraviolet light. In this embodiment, one second light source 72 is arranged at a position facing, via the second window section 17, a portion where the first flow path section 81a and the second flow path section 82a of one branch flow path section 80a communicate with each other. The other second light source 72 is arranged at a position facing, via the second window section 17, a portion where the first flow path section 81b and the second flow path section 82b of the other branch flow path section 80b communicate with each other. The ultraviolet light emitted from the first surface 72a of one second light source 72 is irradiated onto the first flow path portion 81a and the second flow path portion 82a from the side of the communication portion between the first flow path portion 81a and the second flow path portion 82a. The ultraviolet light emitted from the first surface 72a of the other second light source 72 is irradiated onto the first flow path portion 81b and the second flow path portion 82b from the side of the communication portion between the first flow path portion 81b and the second flow path portion 82b.

[0051] Next, a fluid treatment using the fluid ultraviolet light treatment apparatus 1 of this embodiment will be described.

[0052] The fluid ultraviolet light treatment device 1 treats fluids such as liquids and gases by irradiating them with ultraviolet light. For example, by irradiating water with ultraviolet light, the number of bacteria and viruses in the treated water can be reduced compared to before treatment.

[0053] The inlet portion 11 is connected to an external upstream pipe directly or via a coupling member. The outlet portion 15 is connected to an external downstream pipe directly or via a coupling member. The fluid flowing through the external upstream pipe enters the inlet portion 11 and branches into two at the upstream flow path portion 12. A portion of the branched fluid flows into the first flow path portion 81a of one branch flow path portion 80a, and the other portion of the branched fluid flows into the first flow path portion 81b of the other branch flow path portion 80b.

[0054] The fluid that has flowed into the first flow path portions 81a, 81b flows through each of the first flow path portions 81a, 81b in the first direction d1 and flows into the second flow path portions 82a, 82b at the ends of the first flow path portions 81a, 81b on the second end portion 20 side. The fluid that has flowed into the second flow path portions 82a, 82b flows through each of the second flow path portions 82a, 82b in the second direction d2. The fluid flowing through the first flow path portions 81a, 81b and the second flow path portions 82a, 82b is irradiated with ultraviolet light from the second light source 72.

[0055] The fluids that flow in the second direction d2 through the second flow path portions 82a, 82b merge into and flow into the merging flow path portion 90. The fluid that has flowed into the merging flow path portion 90 flows through the merging flow path portion 90 in the first direction d1. The fluid flowing through the merging flow path portion 90 is irradiated with ultraviolet light from the first light source 71. The fluid that has flowed through the merging flow path portion 90 flows out via the outflow portion 15 into the downstream piping connected to the outflow portion 15.

[0056] According to this embodiment, the fluid that flows into the interior of the fluid ultraviolet light treatment device 1 from the inlet 11 is branched into multiple branches that are then merged again and discharged from the outlet 15. This makes it possible to lengthen the length of the flow path along which the fluid flows between the external upstream piping connected to the inlet 11 and the external downstream piping connected to the outlet 15 compared to when the fluid flows from the inlet 11 to the outlet 15 without branching. Then, ultraviolet light is irradiated from the second light source 72 onto the fluid flowing through each of the branched flow paths 80a, 80b, and ultraviolet light is irradiated from the first light source 71 onto the fluid that merges from the branched flow paths 80a, 80b into the junction flow path 90 and flows through the junction flow path 90. This increases the integrated illuminance of ultraviolet light on the fluid flowing inside the fluid ultraviolet light treatment device 1, thereby improving the treatment effect of ultraviolet light on the fluid.

[0057] By making the first direction d1 in which the fluid flows through the first flow path portions 81a, 81b and the second direction d2 in which the fluid flows through the second flow path portions 82a, 82b different directions, it is possible to increase the flow path lengths of the branch flow path portions 80a, 80b while suppressing an increase in the size between the inlet portion 11 and the outlet portion 15 of the flow path portion 100 (size in the X-axis direction). Furthermore, by making the first direction d1 and the second direction d2 opposite to each other, it is possible to increase the flow path lengths of the branch flow path portions 80a, 80b while suppressing an increase in the size of the flow path portion 100 in the X-axis and Z-axis directions.

[0058] In a cross-sectional view in the direction of fluid flow, the flow path sections in the flow path unit 100 are preferably arranged so as to overlap only in one direction (the Z-axis direction in this embodiment). This configuration makes it easier to miniaturize the fluid ultraviolet light treatment device 1 compared to, for example, a configuration in which the flow path sections of the flow path unit 100 are arranged so as to overlap concentrically. Furthermore, in a configuration in which the flow path sections are arranged so as to overlap concentrically, the annular partition members that define the flow path sections are separated from each other, which reduces parts management and assembly. In this embodiment, the partition members 61 to 64 can be integrally configured by having their both ends in the Y direction supported by the third wall section 53 and the fourth wall section 54 that form the housing of the intermediate section 50.

[0059] Each of the branch flow path sections 80a, 80b is not limited to having two flow path sections (first flow path sections 81a, 81b and second flow path sections 82a, 82b), but may have one or three or more flow path sections. Increasing the number of flow path sections included in each of the branch flow path sections 80a, 80b increases the flow path length of each of the branch flow path sections 80a, 80b, thereby increasing the integrated illuminance of ultraviolet light on the fluid flowing through each of the branch flow path sections 80a, 80b. Reducing the number of flow path sections included in each of the branch flow path sections 80a, 80b reduces pressure loss of the fluid flowing inside the fluid ultraviolet light treatment device 1.

[0060] When each of the branch flow path sections 80a, 80b has a plurality of flow path sections, the second light source 72 can irradiate ultraviolet light onto at least one of the plurality of flow path sections included in each of the branch flow path sections 80a, 80b, thereby performing ultraviolet light treatment on the fluid flowing through each of the branch flow path sections 80a, 80b. By having the second light source 72 irradiate ultraviolet light onto two or more or all of the plurality of flow path sections included in each of the branch flow path sections 80a, 80b, the treatment effect of ultraviolet light on the fluid flowing through the branch flow path sections 80a, 80b can be further enhanced.

[0061] The occurrence of vortices or turbulence in the flow path section 100 is likely to cause pressure loss of the fluid. Therefore, to suppress pressure loss of the fluid, it is preferable to reduce the difference in flow velocity and flow rate of the fluid flowing from each of the branch flow path sections 80a and 80b into the confluence flow path section 90.

[0062] For example, the cross-sectional shapes of the first flow path portions 81a and 81b in a direction perpendicular to the first direction d1 in which the fluid flows are rectangular. The cross-sectional shapes of the second flow path portions 82a and 82b in a direction perpendicular to the second direction d2 in which the fluid flows are rectangular. The cross-sectional shape of the junction flow path portion 90 in a direction perpendicular to the first direction d1 in which the fluid flows is rectangular.

[0063] Furthermore, the cross-sectional area of ​​the first flow path portion 81a in the direction perpendicular to the first direction d1 in which the fluid flows, the cross-sectional area of ​​the first flow path portion 81b in the direction perpendicular to the first direction d1 in which the fluid flows, the cross-sectional area of ​​the second flow path portion 82a in the direction perpendicular to the second direction d2 in which the fluid flows, and the cross-sectional area of ​​the second flow path portion 82b in the direction perpendicular to the second direction d2 in which the fluid flows are all the same. Therefore, the cross-sectional area of ​​one branch flow path portion 80a in the direction perpendicular to the fluid flow direction is the same as the cross-sectional area of ​​the other branch flow path portion 80b in the direction perpendicular to the fluid flow direction.

[0064] The length from one upstream end 80a1 of one branch flow path section 80a to the other downstream end 80a2 is the same as the length from one upstream end 80b1 of the other branch flow path section 80b to the other downstream end 80b2.

[0065] Therefore, according to this embodiment, it is possible to reduce the difference in flow velocity and flow rate between the fluids flowing from the branch flow path sections 80a and 80b into the confluence flow path section 90. This makes it possible to suppress pressure loss of the fluids due to the generation of vortices and turbulence in the flow path section 100.

[0066] Furthermore, the cross-sectional area of ​​the first flow path portion 81a of one branch flow path portion 80a, which is perpendicular to the fluid flow direction, is equal to or larger than the cross-sectional area of ​​the inlet portion 11, which is perpendicular to the fluid flow direction. For example, the cross-sectional area of ​​the first flow path portion 81a, which is perpendicular to the fluid flow direction, is the same as the cross-sectional area of ​​the inlet portion 11, which is perpendicular to the fluid flow direction. The cross-sectional area of ​​the first flow path portion 81b of the other branch flow path portion 80b, which is perpendicular to the fluid flow direction, is equal to or larger than the cross-sectional area of ​​the inlet portion 11, which is perpendicular to the fluid flow direction. For example, the cross-sectional area of ​​the first flow path portion 81b, which is perpendicular to the fluid flow direction, is the same as the cross-sectional area of ​​the inlet portion 11, which is perpendicular to the fluid flow direction. This allows the flow velocity of the fluid branching from the inlet portion 11 and flowing into each of the first flow path portions 81a, 81b to be half or less of the flow velocity of the fluid flowing through the inlet portion 11. By reducing the flow rate of the fluid flowing through the first flow path sections 81a, 81b, the integrated illuminance of the ultraviolet light from the second light source 72 on the fluid flowing through the first flow path sections 81a, 81b can be increased, thereby improving the treatment effect of the ultraviolet light on the fluid flowing through the first flow path sections 81a, 81b.

[0067] Furthermore, the cross-sectional area of ​​the second flow path portion 82a of one branch flow path portion 80a, which is perpendicular to the fluid flow direction, is equal to or larger than the cross-sectional area of ​​the inlet portion 11, which is perpendicular to the fluid flow direction. For example, the cross-sectional area of ​​the second flow path portion 82a, which is perpendicular to the fluid flow direction, is the same as the cross-sectional area of ​​the inlet portion 11, which is perpendicular to the fluid flow direction. The cross-sectional area of ​​the second flow path portion 82b of the other branch flow path portion 80b, which is perpendicular to the fluid flow direction, is equal to or larger than the cross-sectional area of ​​the inlet portion 11, which is perpendicular to the fluid flow direction. For example, the cross-sectional area of ​​the second flow path portion 82b, which is perpendicular to the fluid flow direction, is the same as the cross-sectional area of ​​the inlet portion 11, which is perpendicular to the fluid flow direction. This allows the flow rate of the fluid that branches off from the inlet portion 11, flows into each of the first flow path portions 81a, 81b, and further flows through the second flow path portions 82a, 82b to be half or less of the flow rate of the fluid that flows through the inlet portion 11. By reducing the flow rate of the fluid flowing through the second flow path sections 82a, 82b, the integrated illuminance of the ultraviolet light from the second light source 72 on the fluid flowing through the second flow path sections 82a, 82b can be increased, thereby improving the treatment effect of the ultraviolet light on the fluid flowing through the second flow path sections 82a, 82b.

[0068] The fluids from the second flow path portions 82a, 82b of the two branch flow path portions 80a, 80b merge and flow into the confluence flow path portion 90. Therefore, in order to reduce the flow velocity of the fluid flowing through the confluence flow path portion 90, it is preferable to make the cross-sectional area of ​​the confluence flow path portion 90 perpendicular to the fluid flow direction larger than the cross-sectional area of ​​the second flow path portions 82a, 82b perpendicular to the fluid flow direction. This makes it possible to increase the integrated illuminance of the ultraviolet light from the first light source 71 on the fluid flowing through the confluence flow path portion 90, thereby improving the treatment effect of the ultraviolet light on the fluid flowing through the confluence flow path portion 90.

[0069] For example, the cross-sectional area of ​​the confluence channel section 90 perpendicular to the fluid flow direction is the sum of the cross-sectional area of ​​one second channel section 82a perpendicular to the fluid flow direction and the cross-sectional area of ​​the other second channel section 82b perpendicular to the fluid flow direction. Therefore, the flow velocity of the fluid flowing through each of the second channel sections 82a, 82b can be made approximately the same as the flow velocity of the fluid flowing through the confluence channel section 90. By maintaining a constant flow velocity or minimizing changes in flow velocity, it is possible to suppress pressure loss of the fluid due to the generation of vortices and turbulence.

[0070] The confluence channel section 90 is not limited to being disposed between the branch channel sections 80a and 80b. For example, in Fig. 2, the two branch channel sections 80a and 80b may be disposed on the first wall section 51 side (upper side in Fig. 2) or the second wall section 52 side (lower side in Fig. 2) of the confluence channel section 90 in the Z-axis direction. For example, the two branch channel sections 80a and 80b may be disposed adjacent to each other in the Y-axis direction on the first wall section 51 side or the second wall section 52 side of the confluence channel section 90.

[0071] [Second embodiment] FIG. 3 is a cross-sectional view of a fluid ultraviolet light treatment device 2 according to a second embodiment of the present invention.

[0072] The fluid ultraviolet light treatment device 2 has a first end 210, a second end 220, an intermediate portion 250, a first light source 71, and two second light sources 72. The first end 210 has an inlet portion 211, and the second end 220 has an outlet portion 215. The intermediate portion 250 is located between the first end 210 and the second end 220 in the direction from the inlet portion 211 to the outlet portion 215.

[0073] The intermediate section 250 has an upstream flow path section 212 connected to the inlet section 211, two branch flow path sections 280a and 280b connected to the upstream flow path section 212, and a confluence flow path section 290 connected to the outlet section 215 sides of the branch flow path sections 280a and 280b.

[0074] In Fig. 3, the flow of fluid is represented by thick arrows. An external upstream pipe is connected to inlet section 211, and fluid flows into inlet section 211 from the upstream pipe. Upstream channel section 212 branches into two from inlet section 211. Branch channel sections 280a and 280b are connected to each of the two branches of upstream channel section 212. The fluid that flows in from inlet section 211 flows into the two branch channel sections 280a and 280b through upstream channel section 212. The two branch channel sections 280a and 280b are connected to junction channel section 290 on the outlet section 215 side. The fluid that flows through the two branch channel sections 280a and 280b merges into junction channel section 290 and flows into it. An external downstream pipe is connected to the outflow section 215, and the fluid that has flowed through the junction flow path section 290 flows out through the outflow section 215 into the external downstream pipe.

[0075] 3, the first light source 71 is disposed in the intermediate section 250. For example, a first surface (light emission surface) 71a of the first light source 71 faces a connection portion of the confluence channel section 290 with the two branch channel sections 280a, 280b via the first window section 14. The first light source 71 can irradiate ultraviolet light in a direction from the inflow section 211 toward the outflow section 215 in the confluence channel section 290.

[0076] One of the two second light sources 72 is disposed at a position where it can irradiate one of the two branch flow path sections 280a, 280b with ultraviolet light, and the other second light source 72 is disposed at a position where it can irradiate the other branch flow path section 280b with ultraviolet light. A first surface (light exit surface) 72a of one of the second light sources 72 faces one of the branch flow path sections 280a via the second window section 17, and a first surface (light exit surface) 72a of the other second light source 72 faces the other branch flow path section 280b via the second window section 17. One of the second light sources 72 can irradiate ultraviolet light in a direction from the inlet portion 211 to the outlet portion 215 of one of the branch flow path sections 280a. The other second light source 72 can irradiate ultraviolet light in a direction from the inlet portion 211 to the outlet portion 215 of the other branch flow path section 280b.

[0077] In the fluid ultraviolet light treatment device 2 of the second embodiment, too, the fluid that flows into the interior of the fluid ultraviolet light treatment device 2 from the inlet 211 is branched into multiple parts, which then merge again and flow out from the outlet 215. This makes it possible to lengthen the length of the flow path along which the fluid flows between the external upstream piping connected to the inlet 211 and the external downstream piping connected to the outlet 215 compared to when the fluid flows from the inlet 211 to the outlet 215 without branching. Then, ultraviolet light is irradiated from the second light source 72 onto the fluid flowing through each of the branched flow paths 280a, 280b, and further, ultraviolet light is irradiated from the first light source 71 onto the fluid that merges from the branched flow paths 280a, 280b into the junction flow path 290 and flows through the junction flow path 290. This makes it possible to increase the integrated illuminance of ultraviolet light on the fluid flowing inside the fluid ultraviolet light treatment device 2, thereby improving the treatment effect of ultraviolet light on the fluid.

[0078] The light source 170 shown in FIG. 4A can also be used as the first light source and the second light source.

[0079] Light source 170 includes wiring board 171 and a plurality of light-emitting elements. The light-emitting elements are mounted on the surface of wiring board 171. In a plan view seen from the surface side of wiring board 171, wiring board 171 is, for example, rectangular, and the center of wiring board 171 is located at the intersection of two diagonal lines of this rectangle. Wiring board 171 includes first region 181 and second region 182. First region 181 and second region 182 are arranged to be aligned in one direction of wiring board 171. Wiring board 171 may further include third region 183. Third region 183 is located between first region 181 and second region 182 in a plane parallel to the surface of wiring board 171. Third region 183 includes the center of wiring board 171. If third region 183 is not arranged, the center of wiring board 171 is located, for example, at the boundary between first region 181 and second region 182. The first region 181 or the second region 182 may include the center of the wiring substrate 171 .

[0080] The width of the third region 183 in the direction in which the first region 181, the third region 183, and the second region 182 are arranged is preferably equal to or greater than the thickness of the first partitioning member 61 and the fourth partitioning member 64.

[0081] In the example shown in FIG. 4A, a plurality of housings 172 are placed in the first region 181. A plurality of housings 172 are placed in the second region 182. One housing 172 includes at least one light-emitting element. The housing 172 may also include a lens disposed on the light-emitting element. Alternatively, light-emitting elements that are not housed in the housings 172 may be disposed in the first region 181 and the second region 182. No light-emitting elements are disposed in the third region 183.

[0082] The light source 170 may have a holding member 173 that holds the wiring board 171. The holding member 173 has a surface 173e on which the wiring board 171 is placed and a surface opposite the surface 173e. The wiring board 171 is fixed to the surface 173e of the holding member 173 by, for example, screws, an adhesive, or the like. The surface of the wiring board 171 on which the housing 172 including the light emitting element is placed is the first surface 170a of the light source 170, and the surface of the holding member 173 opposite the surface 173e is the second surface 170b of the light source 170. The holding member 173 has a wall 173b that covers the end of the wiring board 171 on the first surface 170a side of the light source 170. For example, the pair of walls 173b are positioned to sandwich the wiring board 171 in a plan view of the first surface 170a.

[0083] In light source 170, wiring 174 electrically connected to the light emitting element can be arranged on the surface of wiring board 171. Furthermore, connector 175 electrically connected to wiring 174 can be arranged on the surface of wiring board 171. An insertion opening 173a that exposes connector 175 from holding member 173 is arranged on one wall portion 173b of holding member 173.

[0084] Spring members 176 are arranged on the first surface 170a side of light source 170. Spring members 176 are, for example, metal leaf springs. For example, a pair of spring members 176 are positioned to sandwich wiring board 171 in a plan view of first surface 170a, and are fixed to holding member 173.

[0085] 2 as a first light source. A first surface 170a of the light source 170 arranged in the first light source arrangement section 13 faces the first window section 14. The ultraviolet light emitted from the first surface 170a is irradiated onto the fluid flowing through the junction channel section 90 via the first window section 14.

[0086] The light source 170 is arranged in the first light source mounting section 13 with the spring member 176 elastically deformed from its natural state. The spring member 176 arranged on the first surface 170a side abuts against the first window section 14. The restoring force of the spring member 176 urges the light source 170 toward the first partition wall 13b that separates the upstream flow path section 12 and the first light source mounting section 13, and the second surface 170b is pressed against the first partition wall 13b. This makes it possible to increase the efficiency with which the light source 170 is cooled by the fluid flowing through the upstream flow path section 12.

[0087] 2 as a second light source. A first surface 170a of the light source 170 arranged in the second light source arrangement section 16 faces the second window section 17. The ultraviolet light emitted from the first surface 170a passes through the second window section 17 and is irradiated onto the fluid flowing through the branch flow path sections 80a and 80b.

[0088] The light source 170 is arranged in the second light source mounting section 16 with the spring member 176 elastically deformed from its natural state. The spring member 176 provided on the first surface 170a side abuts against the second window section 17. Due to the restoring force of the spring member 176, the light source 170 is urged toward the second partition wall 16b that separates the downstream flow path section 110 and the second light source mounting section 16, and the second surface 170b is pressed against the second partition wall 16b. This makes it possible to increase the cooling efficiency of the light source 170 by the fluid flowing through the downstream flow path section 110.

[0089] A first region 181 of the light source 170 arranged in the second light source arrangement section 16 facing one branch flow path section 80a of the pair of branch flow path sections 80a, 80b faces the first flow path section 81a, and the light emitting element arranged in the first region 181 irradiates ultraviolet light onto the fluid flowing through the first flow path section 81a. A second region 182 of the light source 170 arranged in the second light source arrangement section 16 facing one branch flow path section 80a faces the second flow path section 82a, and the light emitting element arranged in the second region 182 irradiates ultraviolet light onto the fluid flowing through the second flow path section 82a.

[0090] The first region 181 of the light source 170 arranged in the second light source mounting section 16 facing the other branch flow path section 80b faces the second flow path section 82b, and the light-emitting element arranged in the first region 181 irradiates ultraviolet light onto the fluid flowing through the second flow path section 82b. The second region 182 of the light source 170 arranged in the second light source mounting section 16 facing the other branch flow path section 80b faces the first flow path section 81b, and the light-emitting element arranged in the second region 182 irradiates ultraviolet light onto the fluid flowing through the first flow path section 81b. Since ultraviolet light from the light-emitting element can be irradiated in the respective extension directions of the first flow path sections 81a, 81b and the second flow path sections 82a, 82b, the integrated illuminance can be increased. The light-emitting element arranged in the first region 181 and the light-emitting element arranged in the second region 182 can be the same light-emitting element. The light-emitting element arranged in the first region 181 and the light-emitting element arranged in the second region 182 may have different emission peak wavelengths.

[0091] The third region 183 of the light source 170 arranged in the second light source mounting section 16 facing one branch flow path section 80a faces the first partition member 61 via a portion where the first flow path section 81a and the second flow path section 82a of the branch flow path section 80a communicate with each other. No light emitting element is arranged in the third region 183 facing the first partition member 61. The third region 183 of the light source 170 arranged in the second light source mounting section 16 facing the other branch flow path section 80b faces the fourth partition member 64 via a portion where the first flow path section 81b and the second flow path section 82b of the branch flow path section 80b communicate with each other. No light emitting element is arranged in the third region 183 facing the fourth partition member 64. The ultraviolet light from the light-emitting elements arranged in the first region 181 and the second region 182 can provide sufficient cumulative illuminance of the ultraviolet light on the fluid flowing through each branch flow path section 80a, 80b. Therefore, by employing a structure in which no light-emitting elements are arranged in the third region 183, the number of light-emitting elements can be reduced while ensuring the treatment effect of ultraviolet light on the fluid.

[0092] 4A can be disposed in the third region 183 of the light source 170 where no light-emitting element is disposed. The third region 183, which is a region including the center of the wiring substrate 171, can be fixed to the holding member 173 by the screws 177. Alternatively, for example, the four corners of the wiring substrate 171 can be fixed to the holding member 173 by the screws. Fixing the third region 183 including the center of the wiring substrate 171 to the holding member 173 with the screws 177 prevents the central portion of the wiring substrate 171 from floating above the holding member 173, thereby allowing the wiring substrate 171 to be tightly attached to the holding member 173. This prevents a gap from being formed between the wiring substrate 171 and the first partition wall 13b, thereby increasing the cooling efficiency of the light source 170 by the fluid flowing through the upstream flow path section 12. Furthermore, reducing a gap between the wiring substrate 171 and the second partition wall 16b can increase the cooling efficiency of the light source 170 by the fluid flowing through the downstream flow path section 110.

[0093] 4B is a perspective view showing a light source 170 having a light reflecting member 178, which is another example of a light source according to an embodiment of the present invention.

[0094] Light reflective member 178 has, for example, a polygonal or circular shape in a plan view seen from the front surface side of wiring substrate 171. In the example shown in FIG. 4B , light reflective member 178 has a substantially rectangular frame shape in a plan view seen from the front surface side of wiring substrate 171. Light reflective member 178 is a member that has a predetermined height from the surface of wiring substrate 171. Light reflective member 178 is disposed so as to surround first region 181, second region 182, and third region 183 in a plan view seen from the front surface side of wiring substrate 171.

[0095] The light reflecting member 178 is made of, for example, a metal material or a resin material, etc. The metal material may be surface-treated aluminum or stainless steel, and the resin material may be fluororesin, etc.

[0096] Light reflecting member 178 reflects light from light emitting elements included in first region 181 and second region 182 toward the inside of light reflecting member 178 using inner surface 178a, thereby suppressing the amount of light from the light emitting elements that goes outside light reflecting member 178. This makes it possible to increase the light extraction efficiency of light source 170.

[0097] In order to suppress light loss due to light absorption or scattering, it is preferable that inner surface 178a of light-reflective member 178 has a high reflectance with respect to the ultraviolet light emitted from the light-emitting element. Such a surface can have, for example, a reflectance of 60% or more, and preferably a reflectance of 90% or more with respect to the ultraviolet light emitted from the light-emitting element. Note that a light-absorbing member may be disposed instead of light-reflective member 178.

[0098] 5 and 6 can also be used as the first light source and the second light source. The light source 270 has a waterproof structure that shields the light emitting element and the wiring board from water. In the following, the description of the configuration common to the light source 170 will be omitted as appropriate.

[0099] 5 and 6, a recess 273a is defined by the surface and wall 273b of the holding member 273. The wiring board 271 is disposed in the recess 273a of the holding member 273.

[0100] The opening of the recess 273a of the holding member 273 is closed by a cover glass 286 made of, for example, synthetic quartz. A waterproof ring 285 is interposed between the cover glass 286 and the holding member 273. The light source 270 may have a frame member 288 disposed on a wall portion 273b of the holding member 273. The frame member 288 may have a rectangular ring shape in a plan view seen from the first surface 270a side of the light source 270. The cover glass 286 is sandwiched between the frame member 288 and the holding member 273. The frame member 288 is fixed to the holding member 273 by, for example, screws while pressing the peripheral portion of the surface 286a of the cover glass 286 (the surface opposite the surface facing the wiring board 271) toward the holding member 273. A buffer material 287 is interposed between the peripheral portion of the surface 286a of the cover glass 286 and the frame member 288. The frame member 288 may be fixed with an adhesive. Furthermore, the light source 270 may have a light reflecting member 178 disposed in the recess 273a as shown in FIG.

[0101] A wall portion 273b defining the recess 273a of the holding member 273 is provided on one side thereof with a cylindrical portion 273c having a first through-hole 273d formed therein and communicating with the inside of the recess 273a.

[0102] The light source 270 can be arranged as a first light source in the first light source mounting section 13 through the first opening 13a shown in Fig. 2. Furthermore, the light source 270 can be arranged as a second light source in the second light source mounting section 16 through the second opening 16a shown in Fig. 2. When the light source 270 is arranged in the first light source mounting section 13, the first opening 13a is closed with a waterproof cap 291 shown in Fig. 5. A waterproof ring 292 is interposed between the waterproof cap 291 and the inner wall of the first opening 13a.

[0103] The waterproof cap 291 has a second through hole 291a. The opening shape of the second through hole 291a is preferably substantially the same as the shape of the tubular portion 273c of the light source 270 when viewed from the opening direction of the first through hole 273d. When the light source 270 is arranged in the first light source mounting portion 13 and the waterproof cap 291 is attached to the first opening 13a, the tubular portion 273c provided on the holding member 273 fits into the second through hole 291a. A waterproof ring 284 is interposed between the tubular portion 273c and the inner wall of the second through hole 291a. This prevents a gap from being formed between the second through hole 291a and the tubular portion 273c, thereby preventing water from entering the first light source mounting portion 13. An electric cable electrically connected to the wiring 274 of the wiring board 271 can be arranged on the surface of the wiring board 271 of the light source 270. In this case, the electric cable can be drawn out to the outside of the light source 270 through the first through-hole 273d of the holding member 273 and the second through-hole 291a of the waterproof cap 291.

[0104] <Effect of fluid retention in the embodiment> In the embodiment, by stagnating a portion of the fluid flowing inside the fluid ultraviolet light treatment devices 1 and 2, the integrated irradiance of the ultraviolet light on the fluid increases according to the residence time, thereby enhancing the treatment effect of the ultraviolet light on the fluid. The effect of this fluid stagnation will be explained in detail below. Note that although the following explanation will be given using the fluid ultraviolet light treatment device 1 as an example, the effect and benefits of fluid stagnation can be obtained in the same way in both the fluid ultraviolet light treatment devices 1 and 2.

[0105] (First example of fluid retention) A first example of the effect of fluid retention will be described with reference to Figures 7 and 8. Figures 7 and 8 are diagrams for explaining the first example of the effect of fluid retention, with Figure 7 being a cross-sectional view of the fluid ultraviolet light treatment device 1 and Figure 8 being a perspective view of the fluid ultraviolet light treatment device 1.

[0106] An end 91 of the confluence channel section 90 on the outflow section 15 side has an opening with a cross-sectional area smaller than the cross-sectional area of ​​the confluence channel section 90 in a direction perpendicular to the first direction d1. As shown in Figures 7 and 8, part of the fluid flowing through the confluence channel section 90 from the inflow section 11 side toward the outflow section 15 side along the X-axis direction bounces off the end 91 of the confluence channel section 90 on the outflow section 15 side, and thereby remains there. A flow 92 indicated by a thick arrow in Figures 7 and 8 represents the flow of the fluid bounced off the end 91.

[0107] For example, due to such flow 92, a portion of the fluid flowing through the confluence channel section 90 will remain in the vicinity of the end 91 for a long time. Note that the flow 92 shown in Figures 7 and 8 is an example shown for the convenience of explanation, and the direction and magnitude of the flow are not limited to this.

[0108] Since the first light source 71 is disposed facing the end portion 91, the ultraviolet light from the first light source 71 is efficiently irradiated onto the fluid stagnating near the end portion 91. As a result, the integrated illuminance of the ultraviolet light irradiated from the first light source 71 onto the fluid stagnating near the end portion 91 increases in accordance with the stagnant time, and therefore the ultraviolet light treatment device 1 for fluid can enhance the treatment effect by ultraviolet light.

[0109] (Second example of fluid retention) Next, FIG. 9 is a cross-sectional view of the fluid ultraviolet light treatment device 1 for explaining a second example of the effect of fluid retention.

[0110] 9, part of the fluid flowing through the branch flow passages 80a and 80b along the X-axis direction generates vortices at the turning points of the branch flow passages 80a and 80b. Here, a vortex refers to a flow of fluid that engulfs something.

[0111] 9, the turning portion 93a1 indicated by the dashed line is a turning portion from the first flow path portion 81a to the second flow path portion 82a in the branch flow path portion 80a. The vortex 94a1 indicated by the thick arrow represents a vortex generated in the second flow path portion 82a near the turning portion 93a1. The turning portion refers to a portion where a fluid flowing in a predetermined direction turns back in a direction opposite to the predetermined direction.

[0112] Similarly, the turning portion 93a2 is a turning portion in the branching channel portion 80a from the second channel portion 82a to the converging channel portion 90. The vortex 94a2 represents a vortex that occurs in the converging channel portion 90 near the turning portion 93a2.

[0113] The turning portion 93b1 is a turning portion from the first flow path portion 81b to the second flow path portion 82b in the branch flow path portion 80b. The vortex 94b1 represents a vortex generated in the second flow path portion 82b near the turning portion 93b1.

[0114] The turning portion 93b2 is a turning portion in the branching channel portion 80b from the second channel portion 82b to the converging channel portion 90. The vortex 94b2 represents a vortex that occurs in the converging channel portion 90 near the turning portion 93b2.

[0115] In particular, since the cross section of the fluid ultraviolet light treatment device 1 perpendicular to the fluid flow direction is configured to be substantially rectangular, vortices are likely to occur at the corners of the turning portions 93a1, 93a2, 93b1, and 93b2. Here, the corners refer to the portions where surfaces intersect.

[0116] Due to the generation of vortices such as vortices 94a1, 94a2, 94b1, and 94b2, a portion of the fluid flowing through branch flow passage portions 80a and 80b remains in the vicinity of turning portions 93a1, 93a2, 93b1, and 93b2 for a long time. Note that vortices 94a1, 94a2, 94b1, and 94b2 shown in FIG. 9 are merely examples shown for the sake of convenience, and the direction and size of the vortices are not limited to these.

[0117] Since the first light source 71 is disposed near each of the turning portions 93a2 and 93b2, the fluid accumulating near each of the turning portions 93a2 and 93b2 is efficiently irradiated with ultraviolet light from the first light source 71. Furthermore, since the second light source 72 is disposed near each of the turning portions 93a1 and 93b1, the fluid accumulating near each of the turning portions 93a1 and 93b1 is efficiently irradiated with ultraviolet light from the second light source 72.

[0118] As a result, the integrated illuminance of the ultraviolet light irradiated from the first light source 71 and the second light source 72 onto the fluid stagnating near each of the turning portions 93a1, 93a2, 93b1 and 93b2 increases depending on the residence time, and therefore the fluid ultraviolet light treatment device 1 can enhance the treatment effect using ultraviolet light.

[0119] Furthermore, for example, when the fluid is water, bacteria and viruses in the water have a larger specific gravity than water, and therefore when flowing through the turning portions 93a1, 93a2, 93b1, and 93b2, centrifugal force causes them to easily pass near the first light source 71 and the second light source 72. Therefore, the fluid ultraviolet light treatment device 1 can improve the treatment effect of ultraviolet light on bacteria and viruses in the water.

[0120] 9 illustrates the fluid ultraviolet light treatment device 1 having a plurality of branch flow path portions 80a, 80b, but is not limited to this configuration. Even when the fluid ultraviolet light treatment device 1 has one branch flow path portion, the effects described in the second example can be obtained.

[0121] (Third example of fluid retention) Next, FIG. 10 is a cross-sectional view of the fluid ultraviolet light treatment device 1 for explaining a third example of the effect of fluid retention.

[0122] 10, when the width w1 of the converging flow path section 90 is wider than the width w2 of each of the branching flow path sections 80a and 80b in the direction perpendicular to the fluid flow direction, vortices are more likely to occur. The direction perpendicular to the fluid flow direction is, for example, the direction along the Y axis or the direction along the Z axis. Therefore, in the fluid ultraviolet light processing device 1, the width w1 along the Y axis may be wider than the width w2 along the Y axis, or the width w1 along the Z axis may be wider than the width w2 along the Z axis.

[0123] By making width w1 wider than width w2, a difference in flow rate or flow velocity is created between the fluid flowing through branch channel portion 80a or 80b and the fluid flowing through converging channel portion 90. This difference in flow rate or flow velocity makes it easier for vortices to occur near turning portions 93a2 and 93b2, respectively, and increases the residence time of the fluid near turning portions 93a2 and 93b2. In FIG. 10, vortex 94a2 represents a vortex generated near turning portion 93a2 in converging channel portion 90, and vortex 94b2 represents a vortex generated near turning portion 93b2 in converging channel portion 90.

[0124] The effect of fluid retention in the vicinity of each of the folded portions 93a2 and 93b2 is the same as that described in the second example above.

[0125] (Fourth example of fluid retention) Next, FIG. 11 is a cross-sectional view of the fluid ultraviolet light treatment device 1 for explaining a fourth example of the effect of fluid retention.

[0126] 11, when the fluid ultraviolet light treatment device 1 is installed so that the branch flow path section 80b is disposed vertically below the branch flow path section 80a, vortices tend to occur near the confluence section 95 located on the inlet section 11 side of the confluence flow path section 90. In FIG. 11, the Z axis is aligned with the vertical direction.

[0127] By arranging branch flow path portion 80b vertically below branch flow path portion 80a, a difference in flow rate or flow velocity is created due to the action of gravity between the fluid flowing from branch flow path portion 80a into junction flow path portion 90 and the fluid flowing from branch flow path portion 80b into junction flow path portion 90. For example, the flow rate of the fluid flowing from branch flow path portion 80a into junction flow path portion 90 is greater than the flow rate of the fluid flowing from branch flow path portion 80b into junction flow path portion 90 due to the action of gravity. In response to this difference in flow rate or flow velocity, vortices are more likely to occur near junction portion 95 where the fluids converge, and the residence time of the fluid near junction portion 95 becomes longer.

[0128] In Fig. 11, vortex 96 represents a vortex that occurs near the confluence 95. Note that the vortex 96 shown in Fig. 11 is an example shown for convenience of explanation, and the direction and size of the vortex are not limited to this.

[0129] Since the first light source 71 is disposed near the confluence 95, ultraviolet light from the first light source 71 is efficiently irradiated onto the fluid stagnating near the confluence 95. As a result, the integrated illuminance of ultraviolet light irradiated from the first light source 71 onto the fluid stagnating near the confluence 95 increases in proportion to the residence time, and therefore the ultraviolet light treatment device 1 for fluid can enhance the treatment effect by ultraviolet light.

[0130] (5th example of fluid retention) Next, FIG. 12 is a cross-sectional view of the fluid ultraviolet light treatment device 1 for explaining a fifth example of the effect of fluid retention.

[0131] As in the fourth example described above, in the fifth example, when the branch flow path portion 80b is disposed vertically below the branch flow path portion 80a, a difference in flow rate or flow velocity is created between the fluid flowing from the branch flow path portion 80a into the junction flow path portion 90 and the fluid flowing from the branch flow path portion 80b into the junction flow path portion 90. This difference in flow rate or flow velocity causes the fluid to flow in a meandering manner through the junction flow path portion 90, as shown in FIG.

[0132] In FIG. 12 , flow 97 represents the flow of fluid flowing from each of branch flow channels 80a and 80b into the confluence flow channel section 90, and flow 98 represents the flow of fluid meandering through the confluence flow channel section 90. For example, the flow rate of fluid flowing from branch flow channel section 80a into the confluence flow channel section 90 is greater than the flow rate of fluid flowing from branch flow channel section 80b into the confluence flow channel section 90 due to the effect of gravity, and the fluid immediately after merging tends to flow vertically downward through the confluence flow channel section 90. In other words, immediately after merging at the confluence flow channel section 90, the vector of the fluid's traveling direction from the inlet section 11 toward the outlet section 15 tends to incline with respect to the X-axis toward the side of branch flow channels 80a and 80b with the lower flow rate. In this example, the side of branch flow channels 80a and 80b with the lower flow rate is the vertically downward side.

[0133] The fluid that flows through the confluence channel section 90 with its traveling vector tilted vertically downward is bounced back vertically upward by the third partition member 63, flows through the confluence channel section 90 with its traveling vector tilted vertically upward, and then is bounced back vertically downward by the second partition member 62. The fluid flows in a meandering manner through the confluence channel section 90 by repeating this operation.

[0134] It is believed that the fluid flows in a meandering manner through the confluence channel section 90, which increases the distance the fluid flows through the confluence channel section 90 and therefore increases the time the fluid remains in the confluence channel section 90. Note that the flows 97 and 98 shown in Fig. 12 are examples shown for the sake of convenience, and the direction and magnitude of the flows are not limited to these.

[0135] Here, meandering of the fluid like the flow 98 is a phenomenon that occurs more significantly when the branch flow path sections 80a and 80b are separated from each other by the second partition member 62 and the third partition member, etc. In other words, by providing the branch flow path sections 80a and 80b that are separated from each other, the fluid ultraviolet light treatment device 1 can impart a difference in flow rate or flow velocity to the fluid flowing through the branch flow path sections 80a and 80b, making it easier for the fluid to meander like the flow 98.

[0136] For example, if each of the multiple flow paths has an annular shape in a cross section perpendicular to the fluid flow direction, a multi-pipe structure can be constructed in which the multiple flow paths are arranged concentrically. However, in such a multi-pipe structure, the flow paths are connected in the circumferential direction, making it structurally difficult to impart a difference in flow rate or flow velocity to the fluid flowing through each of the multiple flow paths. Therefore, in a configuration in which each of the multiple flow paths has an annular shape, it is difficult to make the fluid meander like flow 98.

[0137] The first light source 71 is disposed so that ultraviolet light from the first light source 71 is efficiently irradiated onto the fluid flowing through the confluence flow path section 90. By making the fluid flowing through the confluence flow path section 90 meander and lengthening the residence time, the integrated illuminance can be increased, and the treatment effect of the ultraviolet light treatment device 1 for fluid can be improved.

[0138] Furthermore, for example, when the fluid is water, bacteria and viruses in the water have a larger specific gravity than water, and therefore are likely to remain in the water for a longer period due to centrifugal force in the meandering fluid flow through the confluence flow path section 90. For this reason, the fluid ultraviolet light treatment device 1 can increase the integrated illuminance of ultraviolet light on bacteria and viruses in the water, thereby improving the treatment effect of ultraviolet light.

[0139] (Example 6 of fluid retention) Next, FIG. 13 is a cross-sectional view of the fluid ultraviolet light treatment device 1 for explaining a sixth example of the effect of fluid retention.

[0140] In a sixth example, the length of at least one of the branch flow path sections in a direction perpendicular to the fluid flow direction is different from the lengths of the other branch flow path sections in a direction perpendicular to the fluid flow direction. In the example shown in Fig. 13, the width w3 of branch flow path section 80a is different from the width w4 of branch flow path section 80b in the direction perpendicular to the fluid flow direction. The difference between the width w3 of branch flow path section 80a and the width w4 of branch flow path section 80b in the direction perpendicular to the fluid flow direction makes it easier for vortices and meandering to occur.

[0141] The direction perpendicular to the fluid flow direction is, for example, the direction along the Y axis or the direction along the Z axis. Therefore, in the fluid ultraviolet light treatment device 1, the width w3 along the Y axis may be different from the width w4 along the Y axis, and the width w3 along the Z axis may be different from the width w4 along the Z axis. In the sixth example, there is no particular restriction on the installation direction of the fluid ultraviolet light treatment device 1. This also applies to the fluid retention effects other than the fourth and fifth examples.

[0142] FIG. 13 illustrates a configuration in which the width w3 of the second flow path portion 82a in the branch flow path portion 80a is narrower than the width w4 of the second flow path portion 82b in the branch flow path portion 80b, thereby making the widths different from each other. However, this is not limiting. For example, the width w3 of the second flow path portion 82a may be wider than the width w4 of the second flow path portion 82b, thereby making the widths different from each other. Furthermore, the width of the first flow path portion 81a in the branch flow path portion 80a may be different from the width of the first flow path portion 81b in the branch flow path portion 80b in a direction perpendicular to the fluid flow direction. Note that, in FIG. 13, the widths of the first flow path portion 81a and the second flow path portion 82a in a direction perpendicular to the fluid flow direction are the same, but may be different. Furthermore, the widths of the first flow path portion 81b and the second flow path portion 82b are the same, but may be different.

[0143] By making the width w3 and the width w4 different, a difference in flow rate or flow velocity is created between the fluid flowing from the branch flow channel portion 80a into the confluence flow channel portion 90 and the fluid flowing from the branch flow channel portion 80b into the confluence flow channel portion 90. For example, if the width w3 is narrower than the width w4, the flow rate of the fluid flowing from the branch flow channel portion 80a into the confluence flow channel portion 90 will be smaller than the flow rate of the fluid flowing from the branch flow channel portion 80b into the confluence flow channel portion 90. In response to this difference in flow rate or flow velocity, vortices are more likely to occur near the confluence portion 95 where the fluids converge, and the residence time of the fluid near the confluence portion 95 will be longer. In addition, in response to the difference in flow rate or flow velocity, the fluid flows in a meandering manner through the confluence flow channel portion 90, thereby lengthening the residence time of the fluid in the confluence flow channel portion 90.

[0144] The effects of vortices such as vortex 96 in confluence section 95 are similar to those described in the fourth example. The effects of meandering flows such as flow 98 in the fluid flowing through confluence channel section 90 are similar to those described in the fifth example.

[0145] In the embodiment, two branch flow path portions, 80a and 80b, are exemplified as the plurality of branch flow path portions, but the present invention is not limited to this configuration. When the fluid ultraviolet light treatment device 1 has three or more branch flow path portions, the effect described in the sixth example can be obtained as long as the length of at least one of the three or more branch flow path portions along the direction perpendicular to the fluid flow direction is different from the lengths of the other branch flow path portions along the direction perpendicular to the fluid flow direction.

[0146] (7th example of fluid retention) Next, Figures 14 to 16 are diagrams of a fluid ultraviolet light treatment device 1 to explain a seventh example of the effect of fluid retention, where Figure 14 is a side view seen from the inlet section 11 side, Figure 15 is a cross-sectional view along line XV-XV in Figure 14, and Figure 16 is a cross-sectional view along line XVI-XVI in Figure 15 seen from the outlet section 15 side.

[0147] 14 to 16, the outline arrows indicate the flow of a portion of the main fluid that flows into the fluid ultraviolet light treatment device 1 through the inlet 11 and flows out of the fluid ultraviolet light treatment device 1 through the outlet 15. Also, in Fig. 14 to 16, the dotted arrows indicate the flow of the fluid that is used to cool the second light source 72, among the fluids flowing inside the fluid ultraviolet light treatment device 1.

[0148] As shown in Figure 15, if the width w5 of the branch flow path section 80a in a direction perpendicular to the extension direction of the branch flow path sections 80a and 80b is different from the width w6 of the folded portions 93a2 and 93b2 in a direction along the extension direction of the branch flow path sections 80a and 80b, vortices are more likely to occur.

[0149] The extension direction of the branch flow path sections 80a and 80b is, for example, the direction along the X-axis. The direction perpendicular to the extension direction of the branch flow path sections 80a and 80b is, for example, the direction along the Y-axis or the direction along the Z-axis. Therefore, in the fluid ultraviolet light treatment device 1, the width w5 along the Y-axis and the width w6 along the X-axis may be different, and the width w5 along the Z-axis and the width w6 along the X-axis may be different.

[0150] By making the width w5 and the width w6 different, a difference in flow rate or flow velocity is created between the fluid flowing through the branch flow path portions 80a and 80b and the fluid flowing through the turning portions 93a2 and 93b2. In response to this difference in flow rate or flow velocity, vortices are more likely to be generated near the turning portions 93a2 and 93b2, respectively, and the residence time of the fluid near the turning portions 93a2 and 93b2 is longer.

[0151] The effect of fluid retention in the vicinity of each of the turn-back portions 93a2 and 93b2 is the same as that described in the above-described Example 2. Furthermore, the same effect of fluid retention can be obtained in the turn-back portions 93a1 and 93a2.

[0152] In the fluid ultraviolet light treatment device 1 shown in FIG. 15, the length in the X-axis direction of each of the first flow path sections 81a, 81b and the second flow path sections 82a, 82b is, for example, 200 mm. The width in the Z-axis direction of each of the first flow path sections 81a, 81b and the second flow path sections 82a, 82b is, for example, 24 mm. The width in the Y-axis direction of each of the first flow path sections 81a, 81b and the second flow path sections 82a, 82b is, for example, 50 mm. The flow rate of the fluid flowing through the fluid ultraviolet light treatment device 1 shown in FIG. 15 is 3 m 3 / h or more is preferable. 3 / h or more, it is possible to prevent air bubbles from remaining inside the fluid ultraviolet light treatment device 1. This prevents a decrease in the integrated illuminance of the ultraviolet light irradiated from the first light source 71 and the second light source 72 due to reflection or scattering by the air bubbles, and the fluid ultraviolet light treatment device 1 can increase the integrated illuminance of the ultraviolet light and improve the treatment effect by the ultraviolet light. Furthermore, in the fluid ultraviolet light treatment device 1, it is possible to prevent a decrease in heat transfer efficiency due to air bubbles entering the downstream flow path section 110, and it is possible to prevent a decrease in the cooling efficiency of the second light source 72 due to the fluid flowing through the downstream flow path section 110. Note that the dimensions of the fluid ultraviolet light treatment device 1 and the flow rate of the fluid are not limited to those described above.

[0153] [Third embodiment] A fluid ultraviolet light treatment device according to a third embodiment will be described. Note that the same components as those in the first and second embodiments are denoted by the same reference numerals, and redundant explanations will be omitted as appropriate. This also applies to other embodiments described below.

[0154] In a fluid ultraviolet light treatment device, if the device is not used for a certain period of time while a liquid is contained therein, mold and bacteria may grow inside the device. Mold and bacteria reduce the treatment effect of the fluid ultraviolet light treatment device. Therefore, in order to prevent the growth of mold and bacteria, it is preferable to drain the liquid from the fluid ultraviolet light treatment device periodically or before a period of non-use, and to empty the device so that no liquid remains inside.

[0155] The ultraviolet light treatment device for fluid of this embodiment has a drain port located vertically downward for discharging the liquid inside the device to the outside. Furthermore, the partition member that separates the liquid flow path inside the ultraviolet light treatment device of this embodiment is tilted with respect to the horizontal direction, which is perpendicular to the vertical direction. This configuration allows the liquid to flow more easily vertically downward when discharging the liquid inside the device to empty it, making it easier to discharge the liquid to the outside through the drain port, thereby preventing the liquid from remaining inside the device.

[0156] 17 is a cross-sectional view of a fluid ultraviolet light treatment device 3 according to a third embodiment of the present invention. As shown in Fig. 17, the fluid ultraviolet light treatment device 3 has a drainage port 120, a drainage mechanism 121, and a plurality of partition members 61a to 64a. As the plurality of partition members 61a to 64a, for example, four partition members (a first partition member 61a, a second partition member 62a, a third partition member 63a, and a fourth partition member 64a) are arranged in the intermediate section 50.

[0157] The drain outlet 120 is a through-hole formed in the second wall portion 52 located vertically below the intermediate portion 50 in the fluid ultraviolet light treatment device 3. The drain outlet 120 can be opened and closed with a plug. When the plug of the drain outlet 120 is open, the liquid inside the fluid ultraviolet light treatment device 3 flows vertically downward due to the action of gravity and is discharged through the drain outlet 120. When the plug of the drain outlet 120 is closed, the liquid inside the fluid ultraviolet light treatment device 3 is not discharged. The position where the drain outlet 120 is formed is not particularly limited as long as it is within the second wall portion 52.

[0158] The drainage mechanism 121 is a mechanism capable of adjusting the amount of liquid discharged from the drainage port 120. For example, the drainage mechanism 121 is a drain device having a stopper that can adjust the open / close state of the drainage port 120. By adjusting the open / close state of the stopper in the drainage device of the fluid ultraviolet light treatment device 3, the amount of liquid discharged through the drainage port 120 can be adjusted. Although the drainage mechanism 121 is not an essential component, it is preferable that the fluid ultraviolet light treatment device 3 has the drainage mechanism 121 from the viewpoint of improving the workability of the drainage operation.

[0159] The shape, placement position, and support method of the first partitioning member 61a are the same as those of the first partitioning member 61 in the first embodiment. The first partitioning member 61a differs from the first partitioning member 61 in that it is tilted at an angle θ1 with respect to the X-axis direction. The X-axis direction is perpendicular to the Z-axis direction and corresponds to the horizontal direction perpendicular to the vertical direction. Because the first partitioning member 61a is tilted at the angle θ1, the height of the surface of the first partitioning member 61a in the vertical direction decreases as it moves in the direction of the X-axis arrow.

[0160] The shape, arrangement position, and support method of the second partitioning member 62a are the same as those of the second partitioning member 62 in the first embodiment. The second partitioning member 62a differs from the second partitioning member 62 in that it is tilted at an angle θ2 with respect to the X-axis direction. In the example shown in Fig. 17, because the second partitioning member 62a is tilted at the angle θ2, the height of the surface of the second partitioning member 62a in the vertical direction decreases in the direction opposite to the direction of the X-axis arrow.

[0161] The shape, placement position, and support method of the third partitioning member 63a are the same as those of the third partitioning member 63 in the first embodiment. The third partitioning member 63a differs from the third partitioning member 63 in that it is tilted at an angle θ3 with respect to the X-axis direction. Because the third partitioning member 63a is tilted at the angle θ3, the height of the surface of the third partitioning member 63a in the vertical direction decreases in the direction opposite to the direction of the X-axis arrow.

[0162] The shape, placement position, and support method of the fourth partitioning member 64a are the same as those of the fourth partitioning member 64 in the first embodiment. The fourth partitioning member 64a differs from the fourth partitioning member 64 in that it is tilted at an angle θ4 with respect to the X-axis direction. Because the fourth partitioning member 64a is tilted at the angle θ4, the height of the surface of the fourth partitioning member 64a in the vertical direction decreases in the direction of the X-axis arrow.

[0163] The angles θ1, θ2, θ3, and θ4 are not particularly limited and can be selected appropriately. From the viewpoint of meeting the drainage standard in the GMP (Good Manufacturing Practice) standard, it is preferable that the angles θ1, θ2, θ3, and θ4 are each about 1°.

[0164] When discharging liquid from inside the fluid ultraviolet light treatment device 3, the plug of the drainage mechanism 121 is opened, and the liquid in the first flow path section 81b is discharged vertically below the fluid ultraviolet light treatment device 3 through the drainage port 120 due to the action of gravity.

[0165] As the liquid in the first flow path portion 81b is discharged, the liquid in the second flow path portion 82b flows along the fourth partition member 64a toward the first flow path portion 81b. The surface of the fourth partition member 64a becomes lower in the vertical direction as it faces the direction of the X-axis arrow. Therefore, the liquid in the second flow path portion 82b is more likely to flow along the fourth partition member 64a toward the first flow path portion 81b due to the action of gravity, and is less likely to accumulate on the fourth partition member 64a.

[0166] The liquid in the converging flow path section 90 flows along the third partition member 63a toward the second flow path section 82b in response to the liquid in the second flow path section 82b flowing into the first flow path section 81b. The surface of the third partition member 63a becomes lower in the vertical direction in the opposite direction to the direction of the X-axis arrow. Therefore, the liquid in the converging flow path section 90 is more likely to flow along the third partition member 63a toward the second flow path section 82b due to the action of gravity, and is less likely to accumulate on the third partition member 63a.

[0167] The liquid in the second flow path section 82a flows along the second partition member 62a toward the junction flow path section 90 in response to the liquid in the junction flow path section 90 flowing into the second flow path section 82b. The surface of the second partition member 62a becomes lower in the vertical direction in the opposite direction to the direction of the X-axis arrow. Therefore, the liquid in the second flow path section 82a is more likely to flow along the second partition member 62a toward the junction flow path section 90 due to the action of gravity, and is prevented from accumulating on the second partition member 62a.

[0168] The liquid in the first flow path portion 81a flows along the first partition member 61a toward the second flow path portion 82a in response to the liquid in the second flow path portion 82a flowing into the confluence flow path portion 90. The surface of the first partition member 61a has a lower vertical height as it faces the direction of the X-axis arrow. Therefore, the liquid in the first flow path portion 81a is more likely to flow along the first partition member 61a toward the second flow path portion 82a due to the action of gravity, and is prevented from accumulating on the first partition member 61a.

[0169] In this way, in the fluid ultraviolet light treatment device 3, when the liquid inside the device is discharged to empty the device, the liquid can be easily discharged to the outside through the drain outlet 120, thereby preventing the liquid from accumulating inside the device.

[0170] 17, the first downstream end 131 is the end of the first partition member 61a on the downstream side in the direction of liquid flow. There may be a gap along the X-axis direction between the first downstream end 131 and the surface of the first end portion 10 facing the first downstream end 131. The presence of this gap is preferable because it makes it easier for the liquid to flow vertically downward through the gap when discharging the liquid from inside the device to empty the device, compared to when there is no gap.

[0171] There is no particular limit to the length of the gap along the X-axis direction between the first downstream end 131 and the surface of the first end 10, as long as the fluid can pass through this gap. However, if the gap is too large, the treatment effect may be reduced when the fluid passes through the gap during treatment by the fluid ultraviolet light treatment device 3, so the length of the gap along the X-axis direction is preferably approximately 1 mm or more and 5 mm or less.

[0172] The second downstream end 132 is the end of the second partition member 62a on the downstream side in the direction of fluid flow. As with the first downstream end 131, there may be a gap along the X-axis direction between the second downstream end 132 and the surface of the second end 20 facing the second downstream end 132. The function and effect of this gap are the same as those of the gap at the first downstream end 131.

[0173] The third downstream end 133 is the end of the third partition member 63a on the downstream side in the direction of fluid flow. As with the first downstream end 131, there may be a gap along the X-axis direction between the third downstream end 133 and the surface of the second end 20 facing the third downstream end 133. The function and effect of this gap are the same as those of the gap at the first downstream end 131.

[0174] The fourth downstream end 134 is the end of the fourth partition member 64a on the downstream side in the direction of fluid flow. As with the first downstream end 131, there may be a gap along the X-axis direction between the fourth downstream end 134 and the surface of the first end 10 facing the fourth downstream end 134. The function and effect of this gap are the same as those of the gap at the first downstream end 131.

[0175] [Fourth embodiment] A fluid ultraviolet light treatment apparatus according to a fourth embodiment will be described.

[0176] In a fluid ultraviolet light treatment device, if air bubbles are contained in the liquid flowing through the flow path section in the device during treatment, the treatment efficiency of the fluid ultraviolet light treatment device may decrease because the liquid is not treated by the fluid ultraviolet light treatment device in an amount equal to the volume of the air bubbles. Also, in the fluid ultraviolet light treatment device 1 of the first embodiment, if air bubbles are contained in the liquid flowing through the downstream flow path section 110, the cooling efficiency of the second light source 72 may decrease depending on the volume of the air bubbles. Note that air bubbles refer to bubbles containing gas in a liquid.

[0177] The fluid ultraviolet light treatment device of this embodiment has a first exhaust port for discharging bubbles in the liquid filled inside the device to the outside, and a second exhaust port for discharging bubbles in the liquid flowing through the downstream flow path section to the outside, both located vertically above the intermediate section 50. In this embodiment, the presence of the first exhaust port can reduce bubbles in the liquid filled inside the device, thereby suppressing a decrease in treatment efficiency by the fluid ultraviolet light treatment device. Furthermore, in this embodiment, the presence of the second exhaust port can reduce bubbles in the liquid flowing through the downstream flow path section 110, thereby suppressing a decrease in cooling efficiency of the second light source 72.

[0178] 18 is a cross-sectional view of a fluid ultraviolet light treatment device 4 according to a fourth embodiment of the present invention. As shown in FIG. 18, the fluid ultraviolet light treatment device 4 has a first exhaust port 130, a first exhaust mechanism 135, a second exhaust port 140, and a second exhaust mechanism 141.

[0179] The first exhaust port 130 is a through-hole formed in the first wall portion 51 located vertically upward in the fluid ultraviolet light treatment device 4. The first exhaust port 130 can be opened and closed with a plug. When the plug of the first exhaust port 130 is open, air bubbles in the liquid inside the fluid ultraviolet light treatment device 4 move vertically upward due to the action of buoyancy and are discharged through the first exhaust port 130. When the plug of the first exhaust port 130 is closed, air bubbles in the liquid inside the fluid ultraviolet light treatment device 4 are not discharged. The position where the first exhaust port 130 is formed is not particularly limited as long as it is within the first wall portion 51.

[0180] The first exhaust mechanism 135 is a mechanism capable of adjusting the amount of bubbles discharged from the first exhaust port 130. For example, the first exhaust mechanism 135 is a drain device having a plug that can adjust the open / close state of the first exhaust port 130. By adjusting the open / close state of the plug of the fluid ultraviolet light treatment device 4, the amount of liquid discharged through the first exhaust port 130 can be adjusted. Although the first exhaust mechanism 135 is not an essential component, it is preferable that the fluid ultraviolet light treatment device 4 has the first exhaust mechanism 135 from the viewpoint of improving the workability of the liquid drainage operation.

[0181] The second exhaust port 140 is a through-hole formed on the vertically upper side of the second end 20 of the fluid ultraviolet light treatment device 4. The second exhaust port 140 can be opened and closed with a plug. When the plug of the second exhaust port 140 is open, air bubbles in the liquid inside the fluid ultraviolet light treatment device 4 move vertically upward due to the action of buoyancy and are discharged through the second exhaust port 140. When the plug of the second exhaust port 140 is closed, air bubbles in the liquid inside the fluid ultraviolet light treatment device 4 are not discharged. The position where the second exhaust port 140 is formed is not particularly limited as long as it is on the vertically upper side of the second end 20.

[0182] The second exhaust mechanism 141 is a mechanism capable of adjusting the amount of bubbles discharged from the second exhaust port 140. For example, the second exhaust mechanism 141 is a drain device having a plug that can adjust the open / close state of the second exhaust port 140. By adjusting the open / close state of the plug of the fluid ultraviolet light treatment device 4, it is possible to adjust the amount of liquid discharged through the second exhaust port 140. Although the second exhaust mechanism 141 is not an essential component, it is preferable that the fluid ultraviolet light treatment device 4 has the second exhaust mechanism 141 from the viewpoint of improving the workability of the liquid drainage operation.

[0183] As described above, in this embodiment, by providing the first exhaust port 130, it is possible to reduce bubbles in the liquid filled inside the device, thereby suppressing a decrease in the processing efficiency of the fluid ultraviolet light processing device 4. Furthermore, in this embodiment, by providing the second exhaust port 140, it is possible to reduce bubbles in the liquid flowing through the downstream flow path section 110, thereby suppressing a decrease in the cooling efficiency of the second light source 72.

[0184] [Fifth embodiment] Fig. 19 is a diagram illustrating a plurality of partitioning members 61b to 64b included in a fluid ultraviolet light treatment device 5 according to a fifth embodiment of the present invention. Fig. 19 shows an extracted intermediate section 50 in the fluid ultraviolet light treatment device 5. As the plurality of partitioning members 61a to 64a, for example, four partitioning members (a first partitioning member 61b, a second partitioning member 62b, a third partitioning member 63b, and a fourth partitioning member 64b) are arranged in the intermediate section 50.

[0185] A plurality of first openings 151 are formed in the first partitioning member 61b. Each of the plurality of first openings 151 is a hole that penetrates the first partitioning member 61b in its thickness direction. A plurality of second openings 152 are formed in the second partitioning member 62b. Each of the plurality of second openings 152 is a hole that penetrates the second partitioning member 62b in its thickness direction. A plurality of third openings 153 are formed in the third partitioning member 63b. Each of the plurality of third openings 153 is a hole that penetrates the third partitioning member 63b in its thickness direction. A plurality of fourth openings 154 are formed in the fourth partitioning member 64b. Each of the plurality of fourth openings 154 is a hole that penetrates the fourth partitioning member 64b in its thickness direction. In the following description, when the plurality of first openings 151, the plurality of second openings 152, the plurality of third openings 153, and the plurality of fourth openings 154 are not particularly distinguished from one another, they will be collectively referred to as openings 150.

[0186] In this embodiment, by providing the opening 150, when the liquid inside the device is discharged to empty the device, the liquid can easily flow vertically downward through the opening 150, thereby preventing the liquid from accumulating inside the device. Furthermore, in this embodiment, by providing the opening 150, air bubbles in the liquid inside the device can easily move vertically upward through the opening 150, thereby reducing the number of air bubbles in the liquid filled inside the device and preventing a decrease in the processing efficiency of the fluid ultraviolet light processing device 5.

[0187] The shape of the openings 150 in a top view is not particularly limited, and can be selected as appropriate from shapes such as circular, elliptical, rectangular, and polygonal. The number, arrangement position, and spacing of the openings 150 can also be selected as appropriate. The openings 150 may be formed only in a portion of each of the first partition member 61b, the second partition member 62b, the third partition member 63b, and the fourth partition member 64b. In this way, in addition to the above-mentioned effects of suppressing liquid retention and reducing air bubbles, the effect of smoothing the flow of fluid flowing through the flow path section 100 in the fluid ultraviolet light treatment device 5, in other words, the effect of rectifying the fluid, can also be obtained.

[0188] [Sixth embodiment] A fluid ultraviolet light treatment device 6 according to a sixth embodiment of the present invention will be described with reference to Fig. 20 to Fig. 22. Fig. 20 is a perspective view of the light source 170 illustrating an example of a photodetector 180 provided in the light source 170 of the fluid ultraviolet light treatment device 6. Figs. 21 and 22 are diagrams illustrating the operation of the photodetector 180, with Fig. 21 being Fig. 1 and Fig. 22 being Fig. 2.

[0189] 20, the fluid ultraviolet light treatment device 6 has a photodetector 180. The photodetector 180 is provided on the first surface 170a of the light source 170. The installation position of the photodetector 180 can be changed as appropriate as long as it is within the area surrounded by the light reflective member 178.

[0190] The photodetector 180 has a light-receiving element that receives ultraviolet light and outputs information corresponding to the intensity of the received ultraviolet light to an external device. Examples of the light-receiving element include a photoelectric conversion element such as a photodiode. For example, the photodetector 180 can output information corresponding to the intensity of ultraviolet light with a wavelength of 265 nm, 280 nm, etc. The output information from the photodetector 180 is a voltage signal, a current signal, etc. The external device is a control device that controls the operation of the fluid ultraviolet light treatment device 6, etc.

[0191] 21 , part of the ultraviolet light emitted from the second light source 72 in the direction where the second window portion 17 is located is transmitted through the second window portion 17 and irradiated onto the flow path portion 100, and the other part is reflected by the second window portion 17 in the direction where the photodetector 180 is located. The photodetector 180 receives the ultraviolet light emitted from the second light source 72 and reflected by the second window portion 17. The photodetector 180 outputs information corresponding to the light intensity of the received ultraviolet light to an external device.

[0192] For example, the second light source 72 may deteriorate over time, resulting in a decrease in the intensity of the ultraviolet light emitted from the second light source 72. When the intensity of the ultraviolet light decreases, the treatment effect of the fluid ultraviolet light treatment device decreases.

[0193] In the fluid ultraviolet light treatment device 6, when the second light source 72 deteriorates, the output information from the photodetector 180 includes information indicating a decrease in the light intensity of the ultraviolet light emitted from the second light source 72. This output information enables the fluid ultraviolet light treatment device 6 to notify an external device of the deterioration of the second light source 72. The external device can control the drive signal of the second light source 72 depending on the degree of deterioration of the second light source 72, or can notify the user of the fluid ultraviolet light treatment device 6 or the like of information urging them to replace the second light source 72.

[0194] Although FIG. 21 illustrates the photodetector 180 provided in the second light source 72, the same effects as those described above can also be obtained by providing the photodetector 180 in the first light source 71.

[0195] The photodetector 180 is not limited to detecting deterioration of the light source 170, but can also detect the state of contamination of the flow path section 100.

[0196] For example, in an ultraviolet light treatment device for fluid, a part of the flow path may become contaminated due to foreign matter adhering to the surface of a window such as the second window 17. When the flow path becomes contaminated, the ultraviolet light irradiated onto the fluid flowing through the flow path from a light source such as the second light source 72 is blocked or absorbed by the contaminated part, thereby reducing the treatment effect of the ultraviolet light treatment device for fluid.

[0197] 22 , in the fluid ultraviolet light treatment device 6, part of the ultraviolet light emitted from the second light source 72 toward the second window portion 17 passes through the second window portion 17 and is irradiated onto the flow path portion 100. Part of the irradiated light is reflected by the end of the first partition member 61, passes through the second window portion 17 from the flow path portion 100 side to the second light source 72 side, and reaches the photodetector 180 provided in the second light source 72. Reflected light 190 indicated by an arrow represents the ultraviolet light reflected by the end of the first partition member 61.

[0198] In the fluid ultraviolet light treatment device 6, when the flow path section 100 becomes dirty, the output information from the photodetector 180 includes information that the flow path section 100 is dirty. The fluid ultraviolet light treatment device 6 can notify an external device of the dirt in the flow path section 100 based on this output information. Based on the output information from the fluid ultraviolet light treatment device 6, the external device can control the drive signal of the second light source 72 depending on the degree of dirt in the flow path section 100, or can notify a user of the fluid ultraviolet light treatment device 6 or the like of information urging them to clean the flow path section 100.

[0199] 22, the fluid ultraviolet light treatment device 6 may have a reflecting member 191 in the confluent flow path section 90 in order to detect contamination of the flow path section 100 due to foreign matter adhering to the surface of the first window section 14. The shape, position, material, etc. of the reflecting member 191 are not limited as long as it can reflect ultraviolet light, but it is preferable that the reflecting member have little effect on the flow of fluid in the confluent flow path section 90.

[0200] A portion of the ultraviolet light emitted from first light source 71 in the direction where first window portion 14 is located passes through first window portion 14 and is irradiated onto confluent flow path portion 90 in flow path portion 100. A portion of the irradiated light is reflected by reflecting member 191, passes through first window portion 14 from the flow path portion 100 side to the first light source 71 side, and reaches photodetector 180 provided in first light source 71. Reflected light 192 indicated by an arrow represents the ultraviolet light reflected by reflecting member 191.

[0201] With the above configuration, the fluid ultraviolet light treatment device 6 can detect contamination of the flow path portion 100 due to foreign matter adhering to the surface of the first window portion 14, and output information including information that the flow path portion 100 is contaminated to an external device. Based on the output information from the fluid ultraviolet light treatment device 6, the external device can control the drive signal of the first light source 71 depending on the degree of contamination of the flow path portion 100, or can notify a user of the fluid ultraviolet light treatment device 6 or the like of information urging them to clean the flow path portion 100.

[0202] The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. All forms that can be implemented by a person skilled in the art through appropriate design modifications based on the above-described embodiments of the present invention also fall within the scope of the present invention as long as they include the gist of the present invention. In addition, a person skilled in the art may come up with various modifications and alterations within the scope of the concept of the present invention, and these modifications and alterations also fall within the scope of the present invention.

[0203] For example, in each of the above-described embodiments, a configuration has been exemplified in which the fluid that has passed through the confluence flow path section 90 flows to each of the outlet section 15 and the downstream flow path section 110, but a configuration in which all of the fluid that has passed through the confluence flow path section 90 flows to the downstream flow path section 110 may also be used.

[0204] If the fluid that has passed through the confluence flow path section 90 flows into both the outflow section 15 and the downstream flow path section 110, the fluid may not reach the vicinity of each end on the vertically upper side or vertically lower side of the downstream flow path section 110. In the areas where the fluid has not reached, the cooling effect of the second light source 72 cannot be sufficiently obtained.

[0205] By making all of the fluid that has passed through the confluence flow path section 90 flow into the downstream flow path section 110, the fluid can reach the vicinity of each end on the vertically upper side or vertically lower side of the downstream flow path section 110. This makes it possible to obtain an appropriate cooling effect for the second light source 72.

[0206] For example, aspects of the present invention are as follows.

[0207] <1> The fluid ultraviolet light treatment device has an inlet and outlet for a fluid, and a flow path section connecting the inlet and outlet, wherein the flow path section includes a plurality of branch flow path sections branching from the inlet section and a confluence flow path section connected downstream of the plurality of branch flow path sections, and is equipped with a first light source capable of irradiating ultraviolet light onto the confluence flow path section, and a plurality of second light sources capable of irradiating ultraviolet light onto each of the plurality of branch flow path sections.

[0208] <2> At least one of the branch flow path sections has a first flow path section disposed on the upstream side and a second flow path section disposed on the downstream side of the first flow path section, the first flow path section extending in a first direction, and the second flow path section extending in a direction different from the first direction. <1> 10 is a fluid ultraviolet light treatment device according to the first embodiment.

[0209] <3> The second flow path portion extends in a direction opposite to the first direction and is disposed adjacent to the first flow path portion. <2> 10 is a fluid ultraviolet light treatment device according to the first embodiment.

[0210] <4> At least one of the second light sources is disposed at a position where it can irradiate the first flow path portion and the second flow path portion with the ultraviolet light. <2> or the above <3> 10 is a fluid ultraviolet light treatment device according to the first embodiment.

[0211] <5> The second light source further includes a partition member that partitions the first flow path portion and the second flow path portion, and the second light source has a wiring board and a plurality of light emitting elements mounted on the wiring board, and the wiring board has a first region on which the light emitting elements are mounted and facing the first flow path portion, a second region on which the light emitting elements are mounted and facing the second flow path portion, and a third region located between the first region and the second region, on which the light emitting elements are not mounted and facing the partition member. <2> ~The above <4> 10 is a fluid ultraviolet light treatment device according to any one of the above.

[0212] <6> At least two of the plurality of branch flow passage portions have the same cross-sectional shape perpendicular to the direction of fluid flow and the same length from one end to the other end of the branch flow passage portion. <1> ~The above <5> 10 is a fluid ultraviolet light treatment device according to any one of the above.

[0213] <7> The cross-sectional area of ​​the confluence flow path section perpendicular to the fluid flow direction is larger than the cross-sectional area of ​​each of the branch flow path sections perpendicular to the fluid flow direction. <1> ~The above <6> 10 is a fluid ultraviolet light treatment device according to any one of the above.

[0214] <8> The area of ​​a cross section of at least one of the branch flow passage sections perpendicular to the direction of fluid flow is equal to or larger than the area of ​​a cross section of the inlet section perpendicular to the direction of fluid flow. <1> ~The above <7> 10 is a fluid ultraviolet light treatment device according to any one of the above.

[0215] <9> The shape of a cross section of each of the inlet and outlet portions perpendicular to the direction of fluid flow is circular. <1> ~The above <8> 10 is a fluid ultraviolet light treatment device according to any one of the above.

[0216] <10> The central axis of the inlet portion coincides with the central axis of the outlet portion. <9> 10 is a fluid ultraviolet light treatment device according to the first embodiment.

[0217] <11> The length of at least one of the plurality of branch flow path sections along a direction perpendicular to the fluid flow direction is different from the length of the other branch flow path sections along a direction perpendicular to the fluid flow direction. <1> ~The above <10> 10 is a fluid ultraviolet light treatment device according to any one of the above. [Explanation of symbols]

[0218] 1, 2, 3, 4, 5, 6...fluid ultraviolet light treatment device, 10, 210...first end portion, 11, 211...inlet portion, 15, 215...outlet portion, 20, 220...second end portion, 50, 250...intermediate portion, 71...first light source, 72...second light source, 80a, 80b, 280a, 280b...branching flow path portion, 81a, 81b...first flow path portion, 82a, 82b...second flow path portion, 90, 290... Merged flow path section, 100...flow path section, 170...light source, 171...wiring board, 172...housing including light-emitting element, 173...holding member, 174...wiring, 176...spring member, 181...first region, 182...second region, 183...third region, 270...light source, 271...wiring board, 272...housing including light-emitting element, 273...holding member, 274...wiring, 276...spring member, 281... First region, 282... second region, 283... third region, 286... cover glass, 291... waterproof cap, 91... end, 92, 97... flow, 93a1, 93a2, 93b1, 93b2... turning portion, 94a1, 94a2, 94b1, 94b2, 96... vortex, 95... confluence portion, 98... flow, θ1, θ2, θ3, θ4... angle, 120... drain port, 121... drain mechanism , 131...first downstream end, 132...second downstream end, 133...third downstream end, 134...fourth downstream end, 130...first exhaust port, 135...first exhaust mechanism, 140...second exhaust port, 141...second exhaust mechanism, 150...opening, 151...first opening, 152...second opening, 153...third opening, 154...fourth opening, 180...photodetector, 190, 192...reflected light, 191...reflective member

Claims

1. A holding member; a wiring board disposed on an upper surface of the holding member; a plurality of light-emitting elements arranged on an upper surface of the wiring substrate and capable of emitting ultraviolet light; a spring member disposed on an upper surface side of the holding member; Equipped with The light source is configured such that the pair of spring members sandwich the wiring board when viewed from above on the upper surface of the holding member.

2. The light source according to claim 1 , wherein the pair of spring members exert a force on the holding member in a direction opposite to the side on which the light-emitting element is arranged, due to the restoring force of the spring members from an elastically deformed state.

3. 3. The light source according to claim 1, wherein the spring member is a metal leaf spring.

4. The light source according to claim 1 , wherein a photodetector is provided on an upper surface of the wiring substrate.

5. The light source according to claim 1 , further comprising a light reflective member that has a substantially rectangular frame shape in a plan view seen from above the upper surface of the wiring board.

6. A light source described in any one of claims 1 to 5, wherein the spring member is arranged on the upper surface of the holding member.

7. a light source placement section that is a space in which the light source according to any one of claims 1 to 6 can be placed; a first window portion disposed on a first surface side of the light source arrangement portion; a partition wall disposed on the opposite side of the light source placement portion from the first surface; a flow path portion including a portion disposed on a first surface side of the light source mounting portion with the first window portion interposed therebetween, and a portion disposed on a second surface side of the light source mounting portion opposite to the first surface with the partition wall interposed therebetween; and the light source is disposed in a state in which the spring member is elastically deformed from a natural state, the spring member abuts against the first window portion, The fluid ultraviolet light treatment device, wherein the holding member of the light source is pressed against the partition wall by the restoring force of the spring member.

8. The spring member is a portion that abuts against the holding member; two portions each abutting the first window portion; The ultraviolet light treatment device for fluid according to claim 7 , wherein, in a plan view of the upper surface of the holding member, a portion that abuts against the holding member is located between two portions that abut against the first window portions.

Images