Fluid sterilization device

Abstract

Provided is a fluid sterilization device capable of improving sterilization efficiency. A fluid sterilization device (1) is provided with: a sterilization chamber main body (10) having a sterilization chamber (60) for a fluid, the wall surface of the sterilization chamber (60) being formed in a concave spherical shape, and the sterilization chamber main body (10) being formed so that a light source opening (14), a chamber inflow port (12) through which the fluid flows into the sterilization chamber (60), and a chamber outflow port (13) through which the fluid flows out of the sterilization chamber (60) are opened in the sterilization chamber (60); and a light source unit (20) configured so as to close the light source opening (14) and to emit ultraviolet light from the light source opening (14) to the sterilization chamber (60), the light source unit (20) being provided with a light-emitting element (22) that emits ultraviolet light, and the light source opening (14) being formed so that an edge line of the light source opening (14) is included in a region of-10 DEG to + 10 DEG of a half-value angle [theta] 5 constituting the light-emitting element (22).

Description

Technical Field

[0001] The present invention relates to a fluid sterilization device. Background Art

[0002] Patent Document 1 discloses a fluid sterilization device using a light-emitting element that emits ultraviolet light. The fluid sterilization device includes: a substantially concave spherical sterilization chamber (accumulation part) for accommodating a fluid, a chamber inlet (supply port) for allowing the fluid to flow into the sterilization chamber, a chamber outlet (take-out port) for taking out the fluid in the sterilization chamber, and a light source unit for irradiating ultraviolet light.

[0003] The sterilization chamber includes: a substantially semi-concave spherical first sterilization chamber located on the upstream side and a substantially semi-concave spherical second sterilization chamber located on the downstream side in the flow direction of the fluid at the chamber inlet. The chamber inlet is formed on the side of the first sterilization chamber, and the chamber outlet is formed on the side of the second sterilization chamber. The light source unit is disposed on the side of the second sterilization chamber.

[0004] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2023-6710

[0005] In the fluid sterilization device, the light source unit is disposed at the light source opening of the sterilization chamber. The light-emitting element constituting the light source unit emits ultraviolet light, and the emitted ultraviolet light is emitted from the light source opening into the interior of the sterilization chamber.

[0006] In order to improve the sterilization efficiency inside the sterilization chamber, it is desired to irradiate the ultraviolet light emitted by the light source unit without omission. However, due to differences in the light-emitting characteristics of the light-emitting element and the positional relationship between the position of the light-emitting element and the light source opening, there is a concern that the sterilization efficiency of the sterilization chamber may decrease. Summary of the Invention

[0007] The present invention has been completed in view of such a background, and an object thereof is to provide a fluid sterilization device capable of improving sterilization efficiency.

[0008] One aspect of the present invention is a fluid sterilization device including: a sterilization chamber main body formed with a sterilization chamber for a fluid, the wall surface of the sterilization chamber being formed in a concave spherical shape, and the sterilization chamber main body having a light source opening formed at the sterilization chamber, a chamber inlet for allowing the fluid to flow into the sterilization chamber, and a chamber outlet for allowing the fluid to flow out of the sterilization chamber; and a light source unit configured to block the light source opening and emit ultraviolet light from the light source opening into the sterilization chamber, the light source unit including a light-emitting element that emits ultraviolet light, and the light source opening being formed such that the edge line of the light source opening is included in a region of -10° to +10° of the half-value angle of the light-emitting element.

[0009] According to the above method, the edge line of the opening for the light source is located at the following position: within the range of -10° to +10° of the half-value angle that constitutes the light-emitting element. The half-value angle of the light-emitting element refers to the angle at which the axial illuminance becomes 50% of the maximum value with the optical axis in the center direction in the diffusion range of the light distribution characteristics. Moreover, as described above, -10° to +10° of the half-value angle of the light-emitting element is the angle near where the illuminance becomes 50% of the maximum value. Therefore, the range of -10° to +10° of the half-value angle that constitutes the light-emitting element becomes a region with an illuminance of 50% or more of the maximum value. In other words, the illuminance of the ultraviolet light emitted from the opening for the light source has an illuminance of 50% or more of the maximum value. The inside of the sterilization chamber is irradiated with ultraviolet light having an illuminance of 50% or more of the maximum value, and the fluid flowing in the sterilization chamber can be efficiently sterilized.

[0010] As described above, it is possible to provide a fluid sterilization device that can improve the sterilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional view showing the structure of the fluid sterilization device according to Embodiment 1.

[0012] Figure 2 It is a diagram schematically showing the flow mode of the fluid of the fluid sterilization device.

[0013] Figure 3 It is a diagram showing the structure of the sterilization chamber main body. Figure 3 (a) thereof is an exploded view of the sterilization chamber main body 10, Figure 3 (b) thereof is a diagram showing the sterilization chamber main body 10 in an actually assembled state.

[0014] Figure 4 It is a diagram showing the positions of the opening for the light source, the chamber inlet, and the chamber outlet when observing the outside of the sterilization chamber main body from the direction of the central axis of the opening for the light source.

[0015] Figure 5 It is a cross-sectional view showing the structure of the light source unit.

[0016] Figure 6 It is a diagram showing the positions of the housing supply port and the light source unit when observing the outside of the housing from the direction of the central axis of the housing supply port.

[0017] Figure 7 It is an enlarged cross-sectional view showing the connection portion between the chamber outlet and the housing discharge port.

[0018] Figure 8 It is a diagram showing the result of the water flow simulation.

[0019] Figure 9It is a cross-sectional view showing the tangent of the sterilization chamber at the light source opening of the sterilization chamber main body.

[0020] Figure 10 It is a diagram showing the light distribution characteristics of the light-emitting element constituting the light source unit.

[0021] Figure 11 It is a diagram showing the range of the half-value angle of the light source unit.

[0022] Explanation of reference numerals

[0023] 1... Fluid sterilization device; 10... Sterilization chamber main body; 12... Chamber inlet; 13... Chamber outlet; 14... Light source opening; 15... Groove; 20... Light source unit; 22... Light-emitting element; 30... Housing; 31A... Housing supply port; 32A... Housing discharge port; 60... Sterilization chamber; θ5... Half-value angle of the light-emitting element; L1... Central axis of the light source opening; L6... Optical axis of the light-emitting element. Detailed description of the preferred embodiment

[0024] The fluid sterilization device includes: a sterilization chamber main body formed with a sterilization chamber for fluid, the wall surface of the sterilization chamber being formed in a concave spherical shape, and the sterilization chamber main body having a light source opening, a chamber inlet for allowing the fluid to flow into the sterilization chamber, and a chamber outlet for allowing the fluid to flow out of the sterilization chamber at the sterilization chamber; and a light source unit configured to block the light source opening and emit ultraviolet light from the light source opening into the sterilization chamber. Moreover, the light source unit includes a light-emitting element that emits ultraviolet light. The light source opening is formed such that the edge line of the light source opening is included in the range of -10° to +10° of the half-value angle constituting the light-emitting element.

[0025] Alternatively, the half-value angle may be 110° to 130°. For example, when the half-value angle is 110°, as follows. Using the optical axis in the center direction within the diffusion range in the light distribution characteristics of the light-emitting element as the central axis, the range from +55° to -55° becomes an illuminance of 50% or more. Moreover, the range of -10° to +10° constituting the half-value angle becomes the range of the light distribution angle of 100° to 120° with the optical axis as the central axis. In this case, the edge line of the light source opening is formed to be included in the range of the light distribution angle of 100° to 120°.

[0026] When the half-value angle is 120°, the edge line of the light source opening is formed to be included in the range of the light distribution angle of 110° to 130° with the optical axis as the central axis. When the half-value angle is 130°, the edge line of the light source opening is formed to be included in the range of the light distribution angle of 120° to 140° with the optical axis as the central axis.

[0027] Thus, by making the half-value angle 110° to 130°, it is possible to emit high-intensity ultraviolet light into the concave spherical sterilization chamber. Therefore, the sterilization efficiency can be improved.

[0028] In addition, it may be that the above-described light-emitting element is configured to have two maximum illuminance axes symmetric with respect to the optical axis in a cross-section at the optical axis in the center direction within the diffusion range in the light distribution characteristics. By using a light-emitting element having such light distribution characteristics, it is possible to uniformly irradiate ultraviolet light into the sterilization chamber. As a result, the sterilization efficiency can be improved.

[0029] In addition, it may be that the edge line of the opening for the light source is formed in a circle. Thereby, it is possible to appropriately emit ultraviolet light having a desired illuminance into the sterilization chamber. As a result, the sterilization efficiency can be improved.

[0030] In addition, it may be that the ratio D / d of the diameter D of the above-described sterilization chamber to the diameter d of the opening for the light source is set in the range of 1.8 to 2.2. By setting the ratio D / d in the range of 1.8 to 2.2, it is possible to irradiate ultraviolet light having a desired illuminance into the concave spherical sterilization chamber.

[0031] In particular, when the half-value angle is 120° and the ratio D / d is 2.0, the boundary surface of the half-value angle becomes a state that coincides with the tangent line at the opening for the light source in the sterilization chamber. Therefore, when the half-value angle is 120° and the ratio D / d is 2.0, it is possible to irradiate ultraviolet light most appropriately. Therefore, it is preferable that the half-value angle is 110° to 130° and the ratio D / d is set in the range of 1.8 to 2.2. By configuring in this way, it is possible to make the illuminance of the ultraviolet light emitted from the opening for the light source more than half, and the sterilization efficiency can be improved.

[0032] In addition, it may be that the above-described light-emitting element is arranged such that the optical axis in the center direction within the diffusion range in the light distribution characteristics coincides with the edge line of the opening for the light source, that is, the central axis of the circle. Thereby, it is possible to irradiate ultraviolet light having a desired illuminance into the sterilization chamber.

[0033] In addition, it may be that the above-described chamber inlet and the above-described chamber outlet are arranged to face the surface on the sterilization chamber side in the plane including the opening for the light source. Thereby, near the chamber inlet and near the chamber outlet, it is possible to make the illuminance of the ultraviolet light a desired value. Moreover, near the opening of the flow path of the chamber inlet and near the opening of the flow path of the chamber outlet, it is possible to irradiate ultraviolet light. Thereby, the sterilization efficiency can be improved.

[0034] (Embodiment 1)

[0035] 1. Basic structure of the fluid sterilization device 1

[0036] Reference Figure 1 The basic structure of the fluid sterilization device 1 will be described. As Figure 1 shown, the fluid sterilization device 1 mainly includes: a sterilization chamber main body 10 having a sterilization chamber 60; a light source unit 20 that emits ultraviolet light into the sterilization chamber 60; and a housing 30 that houses the sterilization chamber main body 10 and the light source unit 20.

[0037] A space is formed between the sterilization chamber main body 10 and the housing 30. Since this space is located outside the sterilization chamber main body 10, this space is referred to as the outer region 70. Also, the fluid sterilization device 1 has a first sealing member 40 and a second sealing member 50. However, the first sealing member 40 and the second sealing member 50 will be described below.

[0038] The fluid sterilization device 1 is a device that allows a fluid to flow into the sterilization chamber 60 from the outside via the outer region 70 and irradiates the fluid in the sterilization chamber 60 with ultraviolet light from the light source unit 20 to sterilize the fluid. The fluid to be sterilized can be a gas or a liquid, and as long as it is within the range of having fluidity, it can also be a mixture of gas and liquid, a mixture of gas and powdered solid, etc. In the case of a liquid, for example, it is water, oil, alcohol, a solution using them as a solvent, etc.

[0039] The sterilization chamber main body 10 has a sterilization chamber 60 inside. The sterilization chamber 60 is a space for irradiating the flowing fluid with ultraviolet light emitted from the light source unit 20. The wall surface of the sterilization chamber 60 is formed in a concave spherical shape. By making the sterilization chamber 60 into a concave spherical shape, the ultraviolet light can be efficiently reflected by the concave sphere, and the illuminance of the ultraviolet light in the sterilization chamber 60 can be increased. Therefore, the sterilization efficiency of the fluid can be improved.

[0040] The sterilization chamber main body 10 uses a material with a high ultraviolet light reflectivity. The sterilization chamber main body 10 is, for example, entirely formed of PTFE (polytetrafluoroethylene). By using PTFE, the reflectivity of ultraviolet light can be increased, and an improvement in sterilization efficiency can be achieved. As long as it is a material with a high reflectivity for ultraviolet light from the light source unit 20, materials other than PTFE can also be used. In particular, it is preferable that the material of the sterilization chamber main body 10 has a reflectivity of 80% or more, preferably 90% or more, and more preferably 95% or more for ultraviolet light from the light source unit 20. In addition, it may be that the sterilization chamber main body 10 is formed only with a surface layer constituting the concave sphere by a material with a reflectivity of 80% or more for ultraviolet light, such as PTFE, aluminum, etc.

[0041] At the sterilization chamber main body 10, a light source opening 14 is formed so as to open into the sterilization chamber 60. The light source opening 14 is an opening for allowing the ultraviolet light emitted from the light source unit 20 to enter the sterilization chamber 60.

[0042] In the sterilization chamber main body 10, a chamber inlet 12 is also formed so as to open into the sterilization chamber 60. The chamber inlet 12 communicates the sterilization chamber 60 with the outer region 70. The chamber inlet 12 is an inlet for allowing a fluid to flow into the sterilization chamber 60 from the outer region 70.

[0043] In the sterilization chamber main body 10, a chamber outlet 13 is also formed so as to open into the sterilization chamber 60. The chamber outlet 13 communicates the sterilization chamber 60 with the outside. The chamber outlet 13 is an outlet for allowing a fluid to flow out from the sterilization chamber 60 to the outside.

[0044] The light source unit 20 is arranged to block the light source opening 14. The light source unit 20 is configured to emit ultraviolet light from the light source opening 14 into the sterilization chamber 60. The part of the light source unit 20 that is exposed at the light source opening 14, i.e., the light emitting surface 20A of the light source unit 20 that emits ultraviolet light, forms a part of the wall surface of the sterilization chamber 60. Therefore, the fluid in the sterilization chamber 60 comes into contact with the light emitting surface 20A of the light source unit 20. As a result, the light source unit 20 is cooled by the fluid in the sterilization chamber 60. As a consequence, the luminous efficiency of the light source unit 20 can be improved.

[0045] The housing 30 is provided to house the sterilization chamber main body 10 and the light source unit 20. In other words, the housing 30 is arranged to cover the sterilization chamber main body 10 and the light source unit 20. Specifically, the inner surface of the housing 30 faces the outer surface of the sterilization chamber main body 10. In addition, the inner surface of the housing 30 faces the outer surface of the light source unit 20. In other words, the inner surface of the housing 30 faces the outer back surface 20B and the outer peripheral surface 20C that constitute the outer surface of the light source unit 20.

[0046] Moreover, an outer region 70 is formed through the gap between the inner surface of the housing 30 and the outer surface of the sterilization chamber main body 10 and the gap between the inner surface of the housing 30 and the outer surface of the light source unit 20. A part of the outer region 70 is a region that faces the inner surface of the housing 30 and the outer surface of the sterilization chamber main body 10. The other part of the outer region 70 is a region that faces the inner surface of the housing 30 and the outer surface of the light source unit 20.

[0047] A housing supply port 31A for supplying a fluid is formed in the housing 30. The housing supply port 31A communicates with the outer region 70. In other words, the fluid supplied from the housing supply port 31A passes through the outer region 70 and then flows into the sterilization chamber 60 from the chamber inlet 12.

[0048] A housing discharge port 32A for discharging a fluid is also formed in the housing 30. The housing discharge port 32A communicates with the chamber outlet 13 of the sterilization chamber main body 10. Therefore, the fluid that has been sterilized in the sterilization chamber 60 is discharged to the outside from the housing discharge port 32A via the chamber outlet 13.

[0049] 2. Fluid flow path for the fluid sterilization device 1

[0050] Refer to Figure 2 The fluid flow path of the fluid sterilization device 1 will be described. As Figure 2 shown, the fluid is supplied from the housing supply port 31A to the outer region 70.

[0051] First, the fluid supplied from the housing supply port 31A flows into the gap between the inner surface of the housing 30 and the outer back surface 20B of the light source unit 20 in the outer region 70. At this time, the fluid contacts the outer back surface 20B of the light source unit 20 to cool the light source unit 20. Next, the fluid flows into the gap between the inner surface of the housing 30 and the outer peripheral surface 20C of the light source unit 20 in the outer region 70. At this time, the fluid contacts the outer peripheral surface 20C of the light source unit 20 to cool the light source unit 20. Next, the fluid flows into the gap between the inner surface of the housing 30 and the outer surface of the sterilization chamber main body 10 in the outer region 70.

[0052] In this way, the fluid supplied from the housing supply port 31A first contacts the outer surface of the light source unit 20, that is, the outer back surface 20B and the outer peripheral surface 20C. Therefore, the light source unit 20 is efficiently cooled by the fluid supplied from the housing supply port 31A. As a result, the luminous efficiency of the light source unit 20 can be improved.

[0053] Next, the fluid in the outer region 70 flows into the sterilization chamber 60 from the chamber inlet 12 of the sterilization chamber main body 10. The fluid flowing into the sterilization chamber 60 advances toward the chamber outlet 13 while maintaining a spiral flow. The fluid flows from the chamber outlet 13 to the housing discharge port 32A and is discharged to the outside.

[0054] Here, since the sterilization chamber 60 has a concave spherical wall surface, the fluid in the sterilization chamber 60 forms a spiral flow. Also, the chamber inlet 12 and the chamber outlet 13 are configured such that as the fluid flowing in from the chamber inlet 12 enters the chamber outlet 13 along the spiral flow generated by the concave spherical wall surface of the sterilization chamber 60, the direction of the central axis of the spiral flow changes.

[0055] As Figure 2 shown, the direction of the central axis of the spiral flow in the sterilization chamber 60 is configured to change from the chamber inlet 12 toward the chamber outlet 13. Due to the positional relationship between the chamber inlet 12 and the chamber outlet 13, the direction of the central axis of the spiral flow of the fluid flowing into the sterilization chamber 60 is configured to change in a manner approaching the direction of the central axis L3 of the chamber outlet 13.

[0056] In this mode, the central axis direction of the spiral flow generated immediately after flowing in from the chamber inlet 12 has an angle with respect to the central axis L3 of the chamber outlet 13. Therefore, the central axis direction of the spiral flow changes. In particular, the angle formed by the central axis direction of the spiral flow and the central axis direction of the chamber outlet 13 is a large angle (an angle close to 90°). Therefore, the angle of change in the central axis direction of the spiral flow becomes larger. By configuring in this way, in the sterilization chamber 60, the stagnant part of the fluid disappears, and good flow can be achieved. In particular, the flow of the fluid near the chamber outlet 13 can be made good.

[0057] In this way, it is possible to suppress the situation where the fluid flowing in from the chamber inlet 12 in the sterilization chamber 60 immediately tends to the chamber outlet 13, and a spiral flow can be effectively generated. The spiral flow can be maintained throughout the sterilization chamber 60. Therefore, the flow path of the fluid in the sterilization chamber 60 can be lengthened. As a result, the desired cumulative dose generated by the ultraviolet light from the light source unit 20 can be ensured, and the desired sterilization performance can be ensured. Moreover, the pressure loss can be made smaller, and the sterilization efficiency can be improved.

[0058] In addition, since the spiral flow can be maintained in the sterilization chamber 60, the pressure loss of the fluid in the sterilization chamber 60 can be made smaller. Thereby, the sterilization efficiency can also be improved.

[0059] 3. Structural members of the sterilization chamber main body 10

[0060] Refer to Figure 3 The structural members of the sterilization chamber main body 10 will be described. The sterilization chamber main body 10 includes a plurality of main body structural members that are at least divided into two parts. The case where the sterilization chamber main body 10 is composed of two main body structural members is taken as an example.

[0061] As Figure 3 shown, the sterilization chamber main body 10 is divided into two parts, namely the first main body structural member 10A and the second main body structural member 10B.

[0062] The first main body structural member 10A and the second main body structural member 10B are configured such that the sterilization chamber 60 is divided into two hemispherical shapes. In other words, the first main body structural member 10A constitutes one of the plurality of main body structural members forming the sterilization chamber main body 10, and the wall surface is formed in a semi-concave spherical shape. The second main body structural member 10B constitutes one of the plurality of main body structural members forming the sterilization chamber main body 10, and the wall surface is formed in a semi-concave spherical shape. The second main body structural member 10B is arranged opposite to the first main body structural member 10A.

[0063] In the first main structural member 10A and the second main structural member 10B, annular boundary surfaces 10Aa and 10Ba appear as dividing surfaces respectively. It is configured such that a sterilization chamber 60 appears inside by matching the annular boundary surface 10Aa of the first main structural member 10A with the annular boundary surface 10Ba of the second main structural member 10B.

[0064] The diameter of the concave spherical surface of the sterilization chamber main body 10 is D. The diameter of the opening of the sterilization chamber 60 at the dividing surface between the first main structural member 10A and the second main structural member 10B is the same as D. By splitting the sterilization chamber main body 10 in this way, it is possible to easily manufacture the sterilization chamber main body 10.

[0065] A light source opening 14 is formed in the first main structural member 10A. The plane P including the light source opening 14 is configured to be a plane parallel to the boundary surfaces 10Aa and 10Ba. In other words, the central axis L1 of the light source opening 14 is orthogonal to the boundary surfaces 10Aa and 10Ba. Therefore, the light source opening 14 is formed at the position in the first main structural member 10A that is farthest from the boundary surface 10Aa. The edge line of the light source opening 14 is, for example, a circle. Therefore, the light source opening 14 is located on the same plane. The diameter of the edge line of the light source opening 14 is d.

[0066] The ratio D / d of the diameter D of the sterilization chamber 60 to the diameter d of the light source opening 14 is, for example, set in the range of 1.8 to 2.2. In this case, when centered on the center point O1 of the sterilization chamber 60, the opening angle θ1 of the light source opening 14 formed in the first main structural member 10A is approximately 60°. Based on the same criterion, the sum of the angles θ2 and θ3 of the concave spherical portion of the first main structural member 10A becomes the remaining 120° (60° each). According to this structure, the fluid flowing in from the chamber inlet 12 effectively collides with the concave spherical wall surface, and a spiral flow can be effectively generated. As a result, the pressure loss can be reduced and the sterilization efficiency can be improved.

[0067] A chamber inlet 12 and a chamber outlet 13 are formed in the second main structural member 10B. The central axis L2 of the chamber inlet 12 is offset with respect to the center point O1 of the sterilization chamber 60. The central axis L2 of the chamber inlet 12 is formed parallel to the central axis L1 of the light source opening 14. However, if the central axis L2 of the chamber inlet 12 is offset with respect to the center point O1, the central axis L2 of the chamber inlet 12 and the central axis L1 of the light source opening 14 can also be in an intersecting positional relationship or a twisted positional relationship.

[0068] The chamber inlet 12 has, for example, a cylindrical inner peripheral surface. The inner diameter of the chamber inlet 12 is di. The central axis L2 of the chamber inlet 12 is offset relative to the center point O1 of the sterilization chamber 60. Therefore, the edge line of the opening of the chamber inlet 12 on the side of the sterilization chamber 60 has an approximately oval shape.

[0069] The chamber inlet 12 is arranged such that the opening of the chamber inlet 12 on the side of the sterilization chamber 60 faces the surface on the side of the sterilization chamber 60 in the plane P including the light source opening 14. In Figure 3 (b) thereof, the opening of the chamber inlet 12 on the side of the sterilization chamber 60 faces downward, and the surface on the side of the sterilization chamber 60 in the plane P including the light source opening 14 faces upward.

[0070] The central axis L3 of the chamber outlet 13 is offset relative to the center point O1 of the sterilization chamber 60. The central axis L3 of the chamber outlet 13 is formed in parallel with the central axis L2 of the chamber inlet 12. Therefore, the central axis L3 of the chamber outlet 13 is also formed in parallel with the central axis L1 of the light source opening 14. However, it may be that if the central axis L3 of the chamber outlet 13 is offset relative to the center point O1, the central axis L3 of the chamber outlet 13 and the central axis L2 of the chamber inlet 12 are in an intersecting positional relationship or a twisted positional relationship. In addition, it may be that the central axis L3 of the chamber outlet 13 and the central axis L1 of the light source opening 14 are in an intersecting positional relationship or a twisted positional relationship.

[0071] The chamber outlet 13 has, for example, a cylindrical inner peripheral surface. The inner diameter of the chamber outlet 13 is do. The central axis L3 of the chamber outlet 13 is offset relative to the center point O1 of the sterilization chamber 60. Therefore, the edge line of the opening of the chamber outlet 13 on the side of the sterilization chamber 60 has an approximately oval shape.

[0072] The chamber outlet 13 is arranged such that the opening of the chamber outlet 13 on the side of the sterilization chamber 60 faces the surface on the side of the sterilization chamber 60 in the plane P including the light source opening 14. In Figure 3 (b) thereof, the opening of the chamber outlet 13 on the side of the sterilization chamber 60 faces downward, and the surface on the side of the sterilization chamber 60 in the plane P including the light source opening 14 faces upward.

[0073] As described above, the central axis L1 of the light source opening 14 is orthogonal to the boundary surfaces 10Aa and 10Ba. In this case, the entire surfaces of the boundary surfaces 10Aa and 10Ba become the surfaces having the maximum angle relative to the central axis L1 of the light source opening 14. Therefore, the amount of ultraviolet light entering the boundary surfaces 10Aa and 10Ba can be reduced, and thus the leakage of ultraviolet light through the boundary surfaces 10Aa and 10Ba can be reduced.

[0074] 4. Positional relationship of the respective openings 12, 13, and 14 of the sterilization chamber main body 10

[0075] Refer to Figure 4 The positional relationship of each of the ports 12, 13, and 14 of the sterilization chamber main body 10 will be described. Specifically, the positional relationship of the chamber inlet 12, the chamber outlet 13, and the light source opening 14 will be described.

[0076] As described above, the central axis L1 of the light source opening 14, the central axis L2 of the chamber inlet 12, and the central axis L3 of the chamber outlet 13 are parallel, for example. Moreover, the edge line of the light source opening 14, the cross-sectional shape of the inner peripheral surface of the chamber inlet 12, and the cross-sectional shape of the inner peripheral surface of the chamber outlet 13 are each circular.

[0077] The chamber inlet 12 is arranged such that the opening of the chamber inlet 12 faces the surface on the sterilization chamber 60 side in the plane P including the light source opening 14. When viewed from the direction of the central axis L1 of the light source opening 14, at least a part of the opening of the chamber inlet 12 is arranged so as not to overlap with the light source opening 14. In this embodiment, when viewed from the direction of the central axis L1 of the light source opening 14, the other part of the opening of the chamber inlet 12 is arranged to overlap with the light source opening 14. In other words, when viewed from Figure 4 the direction shown, the chamber inlet 12 is positioned such that at least a part of it is outside the light source opening 14.

[0078] As described above, when viewed from the direction of the central axis L1 of the light source opening 14, at least a part of the opening of the chamber inlet 12 is arranged so as not to overlap with the light source opening 14. The central axis L1 of the light source opening 14 is parallel to the central axis L2 of the chamber inlet 12. In other words, when viewed from the direction of the central axis L2 of the chamber inlet 12, at least a part of the opening of the chamber inlet 12 is also arranged so as not to overlap with the light source opening 14.

[0079] Therefore, not all of the fluid flowing in from the chamber inlet 12 travels toward the light source opening, but at least a part of the flowing-in fluid collides with the concave spherical wall surface of the sterilization chamber 60. Thus, by at least a part of the flowing-in fluid colliding with the concave spherical wall surface, a spiral flow can be generated in the sterilization chamber. Moreover, a spiral flow is generated immediately after flowing into the sterilization chamber 60, whereby a spiral flow can be maintained in all regions of the concave spherical sterilization chamber 60. Therefore, a desired cumulative exposure amount can be ensured, and a desired sterilization performance can be ensured.

[0080] Alternatively, it is also possible that, in addition to the above structure, when viewed in the direction of the central axis L1 of the light source opening 14, the entire opening of the chamber flow inlet 12 is arranged so as not to overlap with the light source opening 14. In other words, it is also possible that, when viewed in the direction of the central axis L2 of the chamber flow inlet 12, the entire opening of the chamber flow inlet 12 is arranged so as not to overlap with the light source opening 14. In this case, a spiral flow can be effectively generated in the sterilization chamber 60. A stronger spiral flow is generated immediately after flowing into the sterilization chamber 60, whereby the spiral flow can be maintained in all regions of the concave spherical sterilization chamber 60.

[0081] The chamber flow outlet 13 is arranged such that the opening of the chamber flow outlet 13 faces the surface on the sterilization chamber 60 side in the plane P including the light source opening 14. When viewed in the direction of the central axis L1 of the light source opening 14, at least a part of the opening of the chamber flow outlet 13 is arranged so as not to overlap with the light source opening 14. In this embodiment, when viewed in the direction of the central axis L1 of the light source opening 14, the other part of the opening of the chamber flow outlet 13 is arranged to overlap with the light source opening 14. In other words, in addition, when viewed from the Figure 4 direction shown, the chamber flow outlet 13 is also positioned such that at least a part of it is outside the light source opening 14.

[0082] As described above, when viewed in the direction of the central axis L1 of the light source opening 14, at least a part of the opening of the chamber flow outlet 13 is arranged so as not to overlap with the light source opening 14. The central axis L1 of the light source opening 14 is parallel to the central axis L3 of the chamber flow outlet 13. In other words, when viewed in the direction of the central axis L3 of the chamber flow outlet 13, at least a part of the opening of the chamber flow outlet 13 is also arranged so as not to overlap with the light source opening 14.

[0083] Therefore, at least a part of the fluid flowing toward the chamber flow outlet 13 flows toward the chamber flow outlet 13 while colliding with the concave spherical wall surface of the sterilization chamber 60. The fluid flowing toward the chamber flow outlet 13 can be in a state where the spiral flow is maintained. As a result, the fluid flowing from the chamber flow inlet 12 to the chamber flow outlet 13 can maintain the spiral flow throughout. Since the spiral flow can be maintained in the sterilization chamber 60, the pressure loss of the fluid in the sterilization chamber 60 can be reduced, and the sterilization efficiency can be improved. Therefore, the desired cumulative exposure dose can be ensured, and the desired sterilization performance can be ensured.

[0084] Alternatively, it is also possible that, in addition to the above structure, when viewed in the direction of the central axis L1 of the light source opening 14, the entire opening of the chamber flow outlet 13 is arranged so as not to overlap with the light source opening 14. In other words, it is also possible that, when viewed in the direction of the central axis L3 of the chamber flow outlet 13, the entire opening of the chamber flow outlet 13 is arranged so as not to overlap with the light source opening 14. In this case, the fluid flowing toward the chamber flow outlet 13 can maintain a strong spiral flow.

[0085] In addition, the inner diameter of the chamber flow outlet 13 is formed to be larger than the inner diameter of the chamber flow inlet 12. By reducing the inner diameter of the chamber flow inlet 12, the flow velocity flowing into the sterilization chamber 60 can be increased, and a spiral flow can be effectively generated. And by increasing the inner diameter of the chamber flow outlet 13, the flowing fluid can flow out while maintaining the spiral flow. Therefore, the pressure loss near the chamber flow outlet 13 can be reduced, and the sterilization efficiency can be improved.

[0086] In addition, when viewed from Figure 4 the direction shown, the proportion of the areas of the chamber flow inlet 12 and the chamber flow outlet 13 that are outside the light source opening 14 is preferably 50% or more, and the larger the better. Thereby, it is easier to form a spiral flow. In addition, the ratio of this area needs to be set according to the diameter D of the sterilization chamber 60, the inner diameter di of the chamber flow inlet 12, and the inner diameter do of the chamber flow outlet 13.

[0087] 5. Structure of the boundary surfaces 10Aa, 10Ba and the first sealing member 40

[0088] Refer to Figure 3 to describe the boundary surface 10Aa of the first main structural member 10A, the boundary surface 10Ba of the second main structural member, and the first sealing member 40.

[0089] The boundary surface 10Aa of the first main structural member 10A is formed in a ring shape. A ring-shaped groove 15 is formed in the boundary surface 10Aa. The groove 15 is provided to fix the position of the first sealing member 40 at the boundary surface 10Aa for embedding the ring-shaped first sealing member 40. The cross-sectional shape of the groove 15 can be arbitrary as long as it is a shape such as a rectangle, a V-shape, or a circle for embedding the first sealing member 40.

[0090] The first sealing member 40 is formed of fluororubber or fluoroelastomer. All materials are elastic materials that are highly resistant to deterioration caused by ultraviolet light and have a high reflectivity of ultraviolet light. The first sealing member 40 is exemplified by a ring shape with a circular cross-section, but can have any cross-sectional shape.

[0091] The first sealing member 40 is inserted into the groove 15. By inserting the first sealing member 40 into the groove 15, the first sealing member 40 at the boundary surface 10Aa of the first main structural member 10A can be fixed and stabilized, and positioning can be performed. In addition, by inserting the first sealing member 40 into the groove 15, the exposed area of the first sealing member 40 can be reduced, and direct irradiation of ultraviolet light on the first sealing member 40 can be prevented. Therefore, the lifespan of the first sealing member 40 can be extended.

[0092] As Figure 3 shown in (b) of, in the fluid sterilization device 1, the boundary surface 10Aa of the first main structural member 10A is arranged to face the boundary surface 10Ba of the second main structural member 10B. Moreover, in Figure 3 the vertical direction of (b) of, the sterilization chamber main body 10 is arranged to be pressed by the housing 30 inside the housing 30. By this pressing, the first sealing member 40 is in close contact with the boundary surface 10Aa of the first main structural member 10A and the boundary surface 10Ba of the second main structural member 10B over the entire circumference in the circumferential direction. In this way, the first sealing member 40 divides the sterilization chamber 60 and the outer region 70.

[0093] In this state, the boundary surface 10Aa of the first main structural member 10A and the boundary surface 10Ba of the second main structural member 10B are in a close contact state, or in a state with a slight gap. In this way, the sterilization chamber 60 is formed by the semi-concave spherical surface of the first main structural member 10A and the semi-concave spherical surface of the second main structural member 10B, and the sterilization chamber main body 10 is formed.

[0094] According to the above structure, assuming that even if the fluid enters the boundary surfaces 10Aa and 10Ba between the first main structural member 10A and the second main structural member 10B from the sterilization chamber 60, the fluid is prevented from further flowing outward by the first sealing member 40. In other words, by sealing the boundary surfaces 10Aa and 10Ba between the first main structural member 10A and the second main structural member 10B with the first sealing member 40, leakage of the fluid between the sterilization chamber 60 and the outer region 70 can be prevented.

[0095] In addition, depending on the dimensional accuracy and surface roughness of the boundary surfaces 10Aa and 10Ba, there may be contact at local parts in the circumferential direction and separation at the remaining parts in the circumferential direction. In these cases, the first sealing member 40 also closely adheres to the boundary surface 10Ba of the second main structural member 10B over the entire circumference. Therefore, the same effects as described above are achieved.

[0096] In addition, since the first sealing member 40 is made of fluororubber or fluoroelastomer, even if the ultraviolet light from the light source unit 20 travels toward the interfaces 10Aa and 10Ba between the first main structural member 10A and the second main structural member 10B, the ultraviolet light can be reflected by the first sealing member 40. Therefore, it is possible to prevent the leakage of ultraviolet light from the interfaces 10Aa and 10Ba between the first main structural member 10A and the second main structural member 10B to the outside of the sterilization chamber main body 10.

[0097] In addition, the first sealing member 40 is fitted into the groove 15, so it is not directly irradiated by the ultraviolet light from the light source opening 14. Therefore, the service life of the first sealing member 40 can be extended.

[0098] In addition, in this embodiment, the sterilization chamber main body 10 is composed of two members, the first main structural member 10A and the second main structural member 10B, but it may also be composed of three or more main structural members. In this case, it is also possible to prevent the leakage of fluid between the sterilization chamber 60 and the outer region 70 and the leakage of ultraviolet light to the outside of the sterilization chamber main body 10 by arranging the first sealing member 40 at the interfaces between the respective main structural members.

[0099] In addition, in this embodiment, the groove 15 is provided in the first main structural member 10A, but it may also be provided in the second main structural member 10B, or in both.

[0100] 6. Structure of the light source unit 20

[0101] Refer to Figure 5 The structure of the light source unit 20 will be described. Figure 5 FIG. is a cross-sectional view showing the structure of the light source unit 20. The light source unit 20 is arranged to close the light source opening 14 of the sterilization chamber main body 10. In addition, the ultraviolet light emitting side of the light source unit 20 is arranged to face the sterilization chamber 60 side. The ultraviolet light emitted from the light source unit 20 enters the sterilization chamber 60 through the light source opening 14.

[0102] The light source unit 20 includes a mounting substrate 21, a light emitting element 22, a window member 23, a light source housing 24, and a gasket 25. The overall shape of the light source unit 20 is, for example, a disk shape. However, the shape of the light source unit 20 can be any shape.

[0103] The mounting substrate 21 is a substrate having a mounting surface. A wiring pattern is formed on the mounting substrate 21. A wiring 80 for supplying power is connected to the back surface of the mounting substrate 21.

[0104] The light-emitting element 22 is an element that emits ultraviolet light. For example, the light-emitting element 22 uses a group-III nitride semiconductor, and has a light-emitting wavelength of 200 to 280 nm. Since the light-emitting wavelength is in the UVC region, the fluid can be efficiently sterilized. The light-emitting element 22 can also be directly mounted on the mounting surface of the mounting substrate 21, or the packaged LED package can be mounted on the mounting surface of the mounting substrate 21. The LED package is a unit in which the light-emitting element 22 is disposed in a housing and sealed with a glass plate and a lens. In addition, various elements (such as a Zener diode) required for driving and protecting the light-emitting element 22 are mounted on the mounting surface of the mounting substrate 21.

[0105] The window member 23 is a circular glass plate and is disposed on the gasket 25. The window member 23 is made of quartz. Materials other than quartz can also be used as long as they transmit ultraviolet light. For example, sapphire can also be used. In addition, the window member 23 is not limited to a plate shape, and can also be a lens shape, such as a TIR lens, a compound eye lens, a Fresnel lens, etc.

[0106] The light source housing 24 is arranged to cover other parts in such a way that at least the vicinity of the center of the window member 23 is not covered. The light source housing 24 is arranged to continuously cover, for example, the back surface and the side surface of the mounting substrate 21 and the side surface of the window member 23. The light source housing 24 can be formed of one member or can be formed of a plurality of members.

[0107] The light source housing 24 is formed of a material with high heat dissipation. For example, the light source housing 24 is formed of a metal such as SUS or Al, a resin material with high heat dissipation, etc. Since the light source housing 24 of the light source unit 20 is in contact with the fluid, the light source unit 20 can be efficiently cooled.

[0108] The gasket 25 is formed in a ring shape and is arranged along the vicinity of the end on the mounting substrate 21, and the light-emitting element 22 and various elements are located inside the gasket 25. The height of the gasket 25 is set higher than that of the light-emitting element 22 and various elements. The gasket 25 is made of an elastic material that is resistant to ultraviolet light. It can also be the same material as the first sealing member 40.

[0109] The gasket 25 elastically deforms to closely adhere to the mounting substrate 21, the window member 23, and the light source housing 24. Thereby, the internal space surrounded by the light source housing 24, the window member 23, and the gasket 25 is sealed, and the fluid does not leak into the internal space. Therefore, it is possible to prevent the fluid from entering the area where the light-emitting element 22 and various elements are arranged. In addition, the gasket 25 can also closely adhere only to the mounting substrate 21 and the window member 23, or can closely adhere only to the window member 23 and the light source housing 24.

[0110] Here, the outer surface of the light source unit 20 has: a light emitting surface 20A that emits ultraviolet light, an outer back surface 20B located on the back side of the light emitting surface, and an outer peripheral surface 20C. The light emitting surface 20A corresponds to the light source opening 14 and is formed by a portion of the window member 23 that is not covered by the light source housing 24. In other words, the light emitting surface 20A is formed by the surface of the window member 23. The outer back surface 20B is formed by a portion of the light source housing 24 on the back side. The outer peripheral surface 20C is formed by a portion of the light source housing 24 on the outer peripheral surface.

[0111] 7. Structure of the housing 30 and the second sealing member 50

[0112] Refer to Figure 1 , Figure 6 and Figure 7 The structure of the housing 30 and the second sealing member 50 will be described. As described above, the housing 30 is provided so as to house the sterilization chamber main body 10 and the light source unit 20. The housing 30 includes a first housing member 31 and a second housing member 32. The division position between the first housing member 31 and the second housing member 32 can be arbitrarily set. In addition, the housing 30 may be formed of one member or may be formed of three or more members. Further, a sealing structure (not shown) is provided at the joint portion between the first housing member 31 and the second housing member 32.

[0113] The first housing member 31 is configured to cover a part of the outer surface of the sterilization chamber main body 10 and the outer surface of the light source unit 20. Therefore, a part of the outer region 70 is formed between the inner surface of the first housing member 31 and the outer surfaces of the sterilization chamber main body 10 and the light source unit 20.

[0114] A housing supply port 31A is formed in the first housing member 31. The housing supply port 31A is formed in a cylindrical shape, for example, in a cylindrical shape or a polygonal cylindrical shape. As Figure 1 and Figure 6 shown, the housing supply port 31A is arranged to face the outer back surface 20B of the light source unit 20. When viewed from the central axis direction of the housing supply port 31A, at least a part of the opening of the housing supply port 31A is set to face the outer back surface of the light source unit 20. Thereby, the fluid flowing into the outer region 70 from the housing supply port 31A can directly collide with the light source unit 20, and the cooling efficiency of the light source unit 20 can be improved.

[0115] In particular, when viewed from the central axis direction of the housing supply port 31A, it is preferable that the entire opening of the housing supply port 31A is set to face the outer back surface 20B of the light source unit 20. The cooling efficiency of the light source unit 20 can be further improved.

[0116] Further, an opening 31B through which a wiring 80 for connecting the light source unit 20 to the outside passes is provided in the first housing member 31. The opening 31B is, for example, cylindrical, and one end of the cylinder contacts the outer back surface 20B of the light source unit 20. Further, by passing the wiring 80 through the inside of the cylinder of the opening 31B, contact between the connection portion between the light source unit 20 and the wiring 80 and the wiring 80 and a fluid is prevented.

[0117] The second housing member 32 is configured to cover the remaining portion of the outer surface of the sterilization chamber main body 10. A part of the outer region 70 is formed between the inner surface of the second housing member 32 and the outer surface of the sterilization chamber main body 10.

[0118] A housing discharge port 32A is formed in the second housing member 32. The housing discharge port 32A is connected to the chamber discharge port 13 of the sterilization chamber main body 10. Refer to Figure 7 The connection structure between the chamber discharge port 13 of the sterilization chamber main body 10 and the housing discharge port 32A of the housing 30 will be described.

[0119] As Figure 7 shown, the housing discharge port 32A has a cylindrical portion 32Aa protruding toward the chamber discharge port 13 side, and is connected to the chamber discharge port 13 by inserting the cylindrical portion 32Aa into the chamber discharge port 13. Further, in the region of the chamber discharge port 13 on the housing discharge port 32A side, the inner diameter is larger than that of other regions, and the inner diameter is substantially the same as the outer diameter of the cylindrical portion 32Aa.

[0120] A stepped portion 13A is formed in the chamber discharge port 13 due to the difference in the inner diameter. An annular second sealing member 50 is disposed at the stepped portion 13A. The second sealing member 50 is formed of the same material as the first sealing member 40. That is, the second sealing member 50 is formed of fluororubber or fluoroelastomer.

[0121] The second sealing member 50 is formed in an annular shape. The second sealing member 50 is interposed at the boundary surface between the chamber discharge port 13 and the housing discharge port 32A. The second sealing member 50 is elastically deformed by the pressing force from the housing 30, and is in close contact with both the stepped portion 13A of the chamber discharge port 13 and the end of the cylindrical portion 32Aa of the housing discharge port 32A. With such a structure, the second sealing member 50 seals the boundary surface between the chamber discharge port 13 and the housing discharge port 32A. Therefore, the second sealing member 50 prevents leakage of fluid between the chamber discharge port 13 and the outer region 70 through the boundary surface between the chamber discharge port 13 and the housing discharge port 32A.

[0122] 8. Water flow simulation

[0123] The sterilization chamber 60 of this embodiment was modeled and a water flow simulation was performed. The results of the water flow simulation are as Figure 8As can be seen, a spiral flow is formed in the sterilization chamber 60.

[0124] In addition, when the flow rate of water flowing through the sterilization chamber 60 per unit time is 8 L / sec, the residence time of water in the sterilization chamber 60, that is, the time from when water flows in from the chamber inlet 12 until it flows out from the chamber outlet 13, is 0.14 sec. The sterilization performance of the outflowing water is very high, and it can be confirmed that the sterilization or inactivation of target bacteria and viruses is over 90%.

[0125] Based on the above, it is preferable that the sterilization chamber main body 10 is configured such that when the flow rate of the fluid flowing through the sterilization chamber 60 per unit time is 0.5 to 50 L / sec, the residence time of the fluid in the sterilization chamber 60 is 0.02 to 2 sec. Thus, the desired cumulative dose can be ensured, and the desired sterilization performance can be ensured.

[0126] 9. Angle θ4 formed by the tangents at the light source opening 14 in the sterilization chamber 60

[0127] Refer to Figure 9 The angle θ4 formed by the tangents at the light source opening 14 in the sterilization chamber 60 will be described.

[0128] Figure 9 In [figure], L4 and L5 are the tangents at the light source opening 14 in the sterilization chamber 60 in the cross-section of the sterilization chamber main body 10 passing through the central axis L1 of the light source opening 14. The angle formed by the tangents L4 and L5 is θ4.

[0129] As described above, the ratio D / d of the diameter D of the sterilization chamber 60 to the diameter d of the light source opening 14 is set in the range of 1.8 to 2.2. When the ratio D / d is 2.0, the angle θ4 formed by the tangents L4 and L5 is 120°. When the ratio D / d is 1.8, the formed angle θ4 is approximately 113°. When the ratio D / d is 2.2, the formed angle θ4 is approximately 126°.

[0130] When the ratio D / d is in the range of 1.8 to 2.0, the formed angle θ4 is 113° to 120°. Although the reason will be described below, it is more preferable that the ratio D / d is set in the range of 1.8 to 2.0.

[0131] 10. Light distribution characteristics of the light-emitting element 22

[0132] Refer to Figure 10 The light distribution characteristics of the light-emitting element 22 will be described. As Figure 10 shown, the light distribution characteristics of the light-emitting element 22 form a heart shape. Specifically, the light-emitting element 22 is configured such that in the light axis ([ Figure 10In the cross-section at the position of 0° (the 0° position), there are two maximum illuminance axes that are symmetric with respect to the optical axis. The maximum illuminance axes are the two parts near +30° and near -30°.

[0133] In Figure 10 the light distribution characteristics shown, the axes where the illuminance becomes 50% of the maximum value are located near +60° and near -60°. Therefore, in Figure 10 the light distribution characteristics shown, the angle between the axes where the illuminance becomes 50% of the maximum value, that is, the half-value angle, is 120°. Although the reason will be described below, it is preferable to set the half-value angle in the range of 110° to 130°.

[0134] 11. Relationship between the opening 14 for the light source and the half-value angle θ5 of the light-emitting element 22

[0135] Refer to Figures 9 - 11 to describe the relationship between the opening 14 for the light source and the half-value angle θ5 of the light-emitting element 22 in the sterilization chamber 60.

[0136] To make Figure 9 the central axis L1 of the opening 14 for the light source shown coincide with Figure 11 the optical axis L6 of the light-emitting element 22 shown, the sterilization chamber main body 10 and the light source unit 20 are arranged.

[0137] As Figure 10 and Figure 11 shown, the half-value angle θ5 of the light-emitting element 22 is the angle formed by the axes L7 and L10 where the illuminance becomes 50% of the maximum value. The half-value angle θ5 is set to be near 120°, for example. For example, the half-value angle θ5 is set in the range of -10° to +10° centered on 120°. In other words, the half-value angle θ5 is set in the range of 110° to 130°.

[0138] As Figure 11 shown, in the light-emitting surface 20A of the light source unit 20, the diameter of the region included in the range of the half-value angle θ5 of the light-emitting element 22 is d1. In other words, in the light-emitting surface 20A of the light source unit 20, the distance between the intersections of the axes L7 and L10 corresponding to the half-value angle θ5 of the light-emitting element 22 is d1.

[0139] In addition, in the light-emitting surface 20A of the light source unit 20, the diameter of the region included in the range of -10° of the half-value angle θ5 of the light-emitting element 22 is d2. In other words, in the light-emitting surface 20A of the light source unit 20, the distance between the intersections of the axes L8 and L11 corresponding to -10° of the half-value angle θ5 of the light-emitting element 22 is d2. The axes L8 and L11 corresponding to -10° of the half-value angle θ5 of the light-emitting element 22 are the axis +5° from the axis L7 and the axis -5° from the axis L10. Here, Figure 11In this case, the positive angle is the clockwise angle.

[0140] In addition, in the light emitting surface 20A of the light source unit 20, the diameter of the region included in the range of +10° of the half-value angle θ5 of the light emitting element 22 is d3. In other words, in the light emitting surface 20A of the light source unit 20, the distance between the intersection points between the axes L9 and L12 corresponding to +10° of the half-value angle θ5 of the light emitting element 22 is d3. The axes L9 and L12 corresponding to +10° of the half-value angle θ5 of the light emitting element 22 are the axis -5° from the axis L7 and the axis +5° from the axis L10.

[0141] Moreover, the light source opening 14 is formed such that the edge line of the light source opening 14 is included in the region of -10° to +10° that constitutes the half-value angle θ5 of the light emitting element 22. Therefore, Figure 11 In this case, one of the edge lines of the light source opening 14 is located between the axis L8 and the axis L9, and the other edge line of the light source opening 14 is located between the axis L11 and the axis L12. In other words, the diameter d of the light source opening 14 is included in the diameters d2 to d3 of the region included in the range of -10° to +10° of the half-value angle θ5 of the light emitting element 22.

[0142] As described above, the edge line of the light source opening 14 is located at a position included in the region of -10° to +10° that constitutes the half-value angle θ5 of the light emitting element 22. Moreover, -10° to +10° of the half-value angle θ5 of the light emitting element 22 is an angle near 50% of the maximum illuminance. Therefore, the region of -10° to +10° that constitutes the half-value angle θ5 of the light emitting element 22 becomes a region having an illuminance of 50% or more of the maximum illuminance. In other words, the illuminance of the ultraviolet light emitted from the light source opening 14 has an illuminance of 50% or more of the maximum illuminance. Irradiating the inside of the sterilization chamber 60 with ultraviolet light having an illuminance of 50% or more of the maximum illuminance can efficiently sterilize the fluid flowing through the sterilization chamber 60.

[0143] In particular, the half-value angle θ5 is 110° to 130°. For example, when the half-value angle θ5 is 110°, it becomes as follows. Taking the optical axis L6 in the center direction within the diffusion range in the light distribution characteristic of the light emitting element 22 as the central axis, the range from +55° to -55° becomes an illuminance of 50% or more. Moreover, the region of -10° to +10° that constitutes the half-value angle θ5 becomes a range of a light distribution angle of 100° to 120° with the optical axis L6 as the central axis. In this case, the edge line of the light source opening 14 is formed to be included in the range of the light distribution angle of 100° to 120°.

[0144] When the half-value angle θ5 is 120°, the edge line of the light source opening 14 is formed to be included in the range of the light distribution angle of 110° to 130° with the optical axis L6 as the central axis. When the half-value angle θ5 is 130°, the edge line of the light source opening 14 is formed to be included in the range of the light distribution angle of 120° to 140° with the optical axis L6 as the central axis.

[0145] By making the half-value angle θ5 be 110° to 130° like this, it is possible to emit high-intensity ultraviolet light into the concave spherical sterilization chamber 60. Therefore, the sterilization efficiency can be improved.

[0146] In addition, the light-emitting element 22 is configured to have two maximum illuminance axes symmetric with respect to the optical axis L6 in the cross section at the optical axis L6 located in the center direction within the diffusion range in the light distribution characteristics. In other words, the light distribution characteristics of the light-emitting element 22 are heart-shaped. By using the light-emitting element 22 having such light distribution characteristics, it is possible to uniformly irradiate ultraviolet light inside the sterilization chamber 60. As a result, the sterilization efficiency can be improved.

[0147] And, the edge line of the light source opening 14 is formed in a circular shape. Thereby, it is possible to appropriately emit ultraviolet light with a desired illuminance into the sterilization chamber 60. As a result, the sterilization efficiency can be improved.

[0148] In addition, the ratio D / d of the diameter D of the sterilization chamber 60 to the diameter d of the light source opening 14 is set in the range of 1.8 to 2.2. By setting the ratio D / d in the range of 1.8 to 2.2, it is possible to irradiate ultraviolet light with a desired illuminance inside the concave spherical sterilization chamber 60.

[0149] In particular, when the half-value angle θ5 is 120° and the ratio D / d is 2.0, the boundary surface of the half-value angle θ5 becomes a state consistent with the tangents L4 and L5 at the light source opening 14 in the sterilization chamber 60. Therefore, when the half-value angle θ5 is 120° and the ratio D / d is 2.0, it is possible to irradiate ultraviolet light most appropriately. Therefore, when the half-value angle θ5 is 110° to 130°, it is preferable to set the ratio D / d in the range of 1.8 to 2.2. By configuring like this, it is possible to make the illuminance of the ultraviolet light emitted from the light source opening 14 be more than half, and the sterilization efficiency can be improved.

[0150] Moreover, the light-emitting element 22 is arranged such that the optical axis L6 located in the center direction within the diffusion range in the light distribution characteristics coincides with the central axis L1 of the edge line of the light source opening 14, that is, a circle. Thereby, it is possible to irradiate ultraviolet light with a desired illuminance into the sterilization chamber 60.

Claims

1. A fluid sterilization device, characterized in that: have: A sterilization chamber body, which is formed as a sterilization chamber having a fluid, the wall surface of the sterilization chamber being formed in a concave spherical shape, and the sterilization chamber body having an opening for a light source, a chamber inlet for allowing the fluid to flow into the sterilization chamber, and a chamber outlet for allowing the fluid to flow out of the sterilization chamber; as well as a light source unit configured to close the light source opening and emit ultraviolet light from the light source opening toward the sterilization chamber, The light source unit includes a light emitting element that emits ultraviolet light. The light source opening is formed so that an edge line of the light source opening is included in a region of -10° to +10° constituting a half-value angle of the light emitting element.

2. The fluid sterilization device according to claim 1, characterized in that: The half-value angle is 110° to 130°.

3. The fluid sterilization device according to claim 1, characterized in that: The light emitting element is configured to have two maximum illuminance axes symmetrical with respect to the optical axis in a cross section passing through the optical axis located in the central direction within a diffusion range in light distribution characteristics.

4. The fluid sterilization device according to any one of claims 1 to 3, characterized in that: The edge line of the light source opening is formed in a circular shape.

5. The fluid sterilization device according to claim 4, characterized in that: The ratio D / d of the diameter D of the sterilization chamber to the diameter d of the light source opening is set in the range of 1.8 to 2.

2.

6. The fluid sterilization device according to claim 4, characterized in that: The light emitting element is arranged so that the optical axis located in the central direction of the diffusion range in the light distribution characteristic coincides with the edge line of the light source opening, that is, the central axis of the circle.

7. The fluid sterilization device according to any one of claims 1 to 3, characterized in that: The chamber inlet and the chamber outlet are arranged to face each other on a surface on the sterilization chamber side in a plane including the light source opening.

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