WO2020183912A1 - Fluid sterilization device - Google Patents

Abstract

Provided is a fluid sterilization device 1 comprising: a flow channel pipe 10 having an inflow port 100, an outflow port 101, and a flow channel 102 for sterilizing a fluid; a light source 15 for radiating ultraviolet rays to the flow channel 102; and at least one of a diffusion member 13 for diffusing a flow of a fluid flowing into the flow channel 102 from the inflow port 100, the diffusion member 13 being installed in the inflow port 100, and a diffusion member 14 for diffusing the flow of the fluid flowing through the flow channel 102 toward the outflow port 101, the diffusion member 14 being installed in the outflow port 101.

Description

Fluid sterilizer

The present invention relates to a fluid sterilizer.

Conventionally, a fluid sterilizer that sterilizes a fluid such as water by irradiating it with ultraviolet rays is known (see, for example, Patent Document 1). In Patent Document 1, in order to irradiate a fluid with ultraviolet rays emitted from an ultraviolet LED with high efficiency, it is an object of the present invention to bring the flow in the flow path of the fluid closer to a desired state.

In the fluid sterilization apparatus described in Patent Document 1, a narrow path narrower than the inflow path is provided between the inflow path of the fluid and the flow path pipe in which the treatment flow path for the sterilization process is formed. .. It is said that this narrow path obstructs the linear flow of the fluid from the inflow path to the end of the flow path tube and disperses the fluid in the other direction to rectify the flow.

JP-A-2018-20205

However, in the fluid sterilizer described in Patent Document 1, in order to form the above-mentioned narrow path, a flow path pipe provided with a cylindrical member having a flange on one end surface may be used, or the end of the flow path pipe may be used. Since a housing that covers the portion and forms a narrow path outside the flow path pipe is used, there are problems that the structure of the flow path pipe is complicated and the size of the fluid sterilizer is increased.

An object of the present invention is a fluid sterilizer having a structure capable of averaging the residence time of a fluid in a flow path and improving the efficiency of sterilization by irradiation with ultraviolet rays without complicating or increasing the size of the structure. Is to provide.

One aspect of the present invention provides the following fluid sterilizers [1] to [11] in order to achieve the above object.

[1] An inflow port into which a fluid flows in, an outflow port from which the fluid flows out, a flow path tube having a flow path for sterilizing the fluid, a light source that irradiates the flow path with ultraviolet rays, and the inflow port. A first diffusing member that is installed and diffuses the flow of the fluid that flows into the flow path from the inflow port, and a flow of the fluid that is installed at the outflow port and goes to the outflow port in the flow path. The first diffusing member comprises at least one of a second diffusing member to be diffused, and the first diffusing member faces the inflow port, which blocks the flow of the fluid flowing into the flow path from the inflow port. The second diffusing member has a first shielding surface and a plurality of first openings for passing the fluid whose flow has been changed by the first shielding surface, and the second diffusion member passes through the flow path. A second shielding surface facing the opposite side of the outlet, which blocks the flow of the fluid toward the outlet, and a second opening for passing the fluid whose flow has been changed by the second shielding surface. Have a fluid sterilizer.
[2] The fluid sterilizer according to the above [1], wherein the value A2 / A1 of the ratio of the area A2 of the first shielding surface to the area A1 of the inflow port is 1/4 or more.
[3] The portion of the first shielding surface farthest from the inlet is farther from the inlet than the portion of the plurality of first openings farthest from the inlet. The fluid sterilizer according to 1] or [2].
[4] The radial cross-sectional area A4 of the first diffusion member passing through the point farthest from the inflow port of the plurality of first openings is subtracted from the radial cross-sectional area A3 of the flow path. Any of the above [1] to [3], wherein the values A3-A4 are equal to or greater than the inflow area A1 and the total area A5 of the plurality of first openings is equal to or greater than the inlet area A1. The fluid sterilizer according to item 1.
[5] The above [1] to [4], wherein the first diffusion member has a first diffusion plate facing the inflow port for diffusing the fluid that has passed through the plurality of first openings. The fluid sterilizer according to any one of the above items.
[6] The value A3-A6 obtained by subtracting the area A6 of the first diffusion plate from the area A3 of the radial cross section of the flow path is equal to or larger than the area A1 of the inflow port, and the plurality of first diffusion plates The fluid sterilizer according to the above [5], wherein the total area A5 of the openings is equal to or larger than the area A1 of the inflow port.
[7] Any one of the above [1] to [6], wherein the first diffusion member has a plurality of first wings that divide the flow of the fluid before being blocked by the first shielding surface. The fluid sterilizer according to the section.
[8] The second diffusion member has a second plate-shaped member facing the outlet, and the surface of the second plate-shaped member opposite to the outlet is the second shielding surface. The fluid sterilizer according to any one of the above [1] to [7].
[9] Any of the above [1] to [8], wherein the second diffusion member has a plurality of second wings forming a flow path of the fluid after passing through the second opening. The fluid sterilizer according to item 1.
[10] The fluid according to any one of [1] to [8], wherein the second opening of the second diffusion member is located in the flow path and does not face the inflow port. Sterilizer.
[11] The fluid sterilizer according to any one of [1] to [10] above, wherein the second diffusion member is installed so as not to protrude into the flow path.

According to the present invention, a fluid sterilizer having a structure capable of averaging the residence time of a fluid in a flow path and improving the efficiency of sterilization by irradiation with ultraviolet rays without complicating or increasing the size of the structure. Can be provided.

FIG. 1 is a perspective view of the fluid sterilizer according to the embodiment. FIG. 2 is a vertical cross-sectional view taken along the length direction of the flow path pipe constituting the fluid sterilizer. FIG. 3A is an enlarged vertical cross-sectional view of the vicinity of the end portion in the length direction of the flow path pipe. FIG. 3B is an enlarged vertical cross-sectional view of the vicinity of the end portion in the length direction of the flow path pipe. FIG. 4 is a schematic view showing the positions of the cross sections relating to the areas A1, A3, and A4. FIG. 5A is a perspective view of an example of the diffusion member. FIG. 5B is a perspective view of an example of the diffusion member. FIG. 6A is a perspective view of an example of the diffusion member. FIG. 6B is a perspective view of an example of the diffusion member. FIG. 7 is a schematic view showing an example of a diffusion member and its peripheral members. FIG. 8 is a schematic view showing an example of a diffusion member and its peripheral members.

[Embodiment]
(Configuration of fluid sterilizer)
FIG. 1 is a perspective view of the fluid sterilizer 1 according to the embodiment. FIG. 2 is a vertical cross-sectional view of the flow path pipe 10 constituting the fluid sterilizer 1 along the length direction. 3A and 3B are vertical cross-sectional views in which the vicinity of the end portion of the flow path pipe 10 in the length direction is enlarged.

The fluid sterilizer 1 is a device for sterilizing a liquid and suppressing the growth of bacteria, and is an inflow port 100 into which a fluid flows, a fluid for flowing a liquid (a liquid to be sterilized) such as water to be sterilized. In the flow path 102 installed at the inflow port 100, the flow path tube 10 having the outflow port 101 through which the fluid flows out, the flow path 102 for sterilizing the fluid, the light source 15 that irradiates the flow path 102 with ultraviolet rays, and the flow path 102. A diffusion member 13 for diffusing the flow of the inflowing fluid and a diffusion member 14 installed at the outlet 101 for diffusing the flow of the fluid toward the outlet 101 in the flow path 102 are provided.

It is preferable that the flow path tube 10 is made of a material such as aluminum having a high reflectance to ultraviolet rays emitted from the light source 15, or the inner surface is coated with such a material.

An inflow pipe 11 through which the fluid flowing into the flow path pipe 10 passes is connected to the inflow port 100 side of the flow path pipe 10. In the example shown in FIGS. 2 and 3A, the opening of the inflow pipe 11 on the flow path pipe 10 side functions as the inflow port 100 of the flow path pipe 10.

The flow path pipe 10 and the inflow pipe 11 are fixed by bolts 20 and nuts 21, for example, as shown in FIGS. 2 and 3A. Further, an annular seal member 22 such as an O-ring may be used at the connection portion between the flow path pipe 10 and the inflow pipe 11.

An outflow pipe 12 through which the fluid flowing out from the flow path pipe 10 passes is connected to the outflow port 101 side of the flow path pipe 10. In the example shown in FIGS. 2 and 3B, the opening of the outflow pipe 12 on the flow path pipe 10 side functions as the outflow port 101 of the flow path pipe 10.

The flow path pipe 10 and the outflow pipe 12 are fixed by, for example, a screw structure. Further, an annular seal member 23 such as an O-ring may be used at the connection portion between the flow path pipe 10 and the outflow pipe 12.

The light source 15 has a light emitting element that emits ultraviolet rays, and can irradiate the fluid flowing through the flow path 102 with ultraviolet rays to sterilize and suppress the growth of bacteria.

The ultraviolet rays emitted by the light source 15 are, for example, ultraviolet rays in a wavelength range (400 to 315 nm) called UV-A, ultraviolet rays in a wavelength range called UV-B (315 to 280 nm), and ultraviolet rays in a wavelength range called UV-C (less than 280 nm). Of these, UV-C, which has the highest bactericidal effect, is preferable.

The light emitting element included in the light source 15 is, for example, an LED chip (Light Emitting Diode) or an LD chip (Laser Diode). The number and arrangement of the light emitting elements included in the light source 15 are not particularly limited, but it is preferable to set the flow path 102 so that the ultraviolet rays can be uniformly irradiated.

The fluid sterilizer 1 has a structure in which the light emitting element constituting the light source 15 is not exposed to the fluid. For example, in the light source 15 shown in FIG. 3B, a light emitting element is housed in a case or a cover in which at least a portion on the light extraction side transmits ultraviolet rays. Further, for example, a partition plate that transmits ultraviolet rays is provided at the end of the flow path tube 10, and a light emitting element is installed in a space in the flow path tube 10 partitioned by the partition plate so that fluid does not enter, and the light source 15 is used. May be good. Quartz glass or fluororesin can be used as the material that transmits ultraviolet rays.

Further, the light source 15 may have a reflector for reflecting the light emitted from the light emitting element to the side and a condensing lens for bringing the light emitted from the light emitting element closer to parallel light.

In the example shown in FIGS. 2 and 3B, the light source 15 is installed on the wiring board 30 that supplies power to the light emitting element, and the wiring board 30 is supported by the lid-shaped support member 31 composed of the members 31a and 31b. To. The member 31a is a member for supporting the wiring board 30, and the member 31b is a spacer for securing an installation space for the light source 15. The connector 33 shown in FIG. 1 is a power line connector for supplying power to the light emitting element of the light source 15 via the wiring board 30.

The flow path pipe 10 and the support member 31 are fixed by bolts 24 and nuts 25, for example, as shown in FIGS. 2 and 3A. Further, an annular seal member 26 such as an O-ring may be used for the connection portion between the flow path pipe 10 and the support member 31.

Since the members 31a and 31b constituting the support member 31 all conduct the heat transmitted from the light source 15 to the fluid and the flow path tube 10, it is preferable that the members 31a and 31b are made of a material having high thermal conductivity such as Al. Further, as shown in FIG. 3B, the support member 31 preferably has a heat sink 32 capable of releasing the heat of the light source 15 to the outside via the wiring board 30.

In the fluid sterilizer 1, the shape of the flow path 102, the installation position of the light source 15, and the like are set so that the ultraviolet rays emitted from the light source 15 are efficiently irradiated to the fluid flowing through the flow path 102. Typically, as shown in FIG. 2, the flow path 102 is linear, and a light source is provided at one end of the flow path 102 in the length direction so that ultraviolet rays can be irradiated along the length direction of the flow path 102. 15 is installed. The shape of the flow path 102 is, for example, a columnar shape or a polygonal columnar shape.

(Diffusion member)
The diffusion member 13 is a member that diffuses the flow of the fluid flowing into the flow path 102 from the inflow port 100, and flows by the shielding surface 130 that blocks the flow of the fluid flowing from the inflow port 100 into the flow path 102 and the shielding surface 130. It has a plurality of openings 131 through which the altered fluid is passed. Normally, the shielding surface 130 and the plurality of openings 131 are continuous, and the fluid whose flow is blocked by the shielding surface 130 flows directly from the plurality of openings 131.

The shielding surface 130 is a surface facing the inflow port 100, and the fluid whose flow is blocked by the shielding surface 130 passes through the plurality of openings 131 and bypasses the shielding surface 130 into the flow path pipe 10. Flow in. Further, since a plurality of openings 131 which are outlets for the fluid of the diffusion member 13 are provided, the flow of the fluid whose direction is changed to the shielding surface 130 is divided into a plurality of portions.

Therefore, the diffusion member 13 can be used to prevent the fluid from flowing linearly from the inflow port 100 to the outflow port 101, and the residence time of the fluid in the flow path 102 can be averaged (improved uniformity). As a result, the time during which the ultraviolet rays emitted from the light source 15 are irradiated to the fluid can be averaged, and sterilization and the like can be effectively performed.

In order to enhance the effect of blocking the flow of fluid by the shielding surface 130, it is preferable that the area of the shielding surface 130 is large to some extent with respect to the area (opening area) of the inflow port 100. For example, it is preferable that the value A2 / A1 of the ratio of the area of the shielding surface 130 (referred to as A2) to the area of the inflow port 100 (referred to as A1) is 1/4 or more.

Further, in order to suppress a decrease in the flow velocity of the fluid in the flow path pipe 10 and an increase in the pressure in the flow path pipe 10, the inner wall and the diffusion member of the flow path 102 portion of the flow path pipe 10 with respect to the area A1 of the inflow port 100. It is preferable that the total of the area of the gap with 13 and the area (opening area) of the plurality of openings 131 is large to some extent. For example, the radial cross section (diametrical direction of the flow path 102) of the diffusion member 13 passing through the point farthest from the inflow port 100 of the plurality of openings 131 from the radial cross-sectional area (referred to as A3) of the flow path 102. The value A3-A4 obtained by subtracting the area (referred to as A4) is equal to or greater than the area A1 of the inflow port 100, and the total area of the plurality of openings 131 (referred to as A5) is equal to or greater than the area A1 of the inflow port. Is preferable.

The method of fixing the diffusion member 13 to the fluid sterilizer 1 is not particularly limited. As shown in FIGS. 2 and 3A, a part of the diffusion member 13 (for example, the substrate 132 of the diffusion members 13a and 13b described later) can be fixed by sandwiching the flow path pipe 10 and the inflow pipe 11.

FIG. 4 is a schematic view showing the positions of the cross sections relating to the above-mentioned areas A1, A3, and A4. Arrows A1, A3, and A4 in FIG. 4 indicate the positions of cross sections related to areas A1, A3, and A4, respectively. In FIG. 4, the diffusion member 13, the bolt 20, and the nut 21 are shown as side views, and the other members are shown in cross section.

5A and 5B are perspective views of the diffusion member 13a, which is an example of the diffusion member 13, as viewed from different directions. The diffusion member 13a is composed of an annular substrate 132 and a dome-shaped member 133 provided so as to cover the holes 134 of the substrate 132.

In the diffusion member 13a, the inner surface of the member 133 serves as a shielding surface 130. The inner surface of the member 133, that is, the shielding surface 130 may have a truncated cone shape, a truncated cone shape, a truncated cone shape, or a truncated cone shape, in addition to the dome shape shown in FIGS. 3A, 5A, and 5B.

The fluid flowing into the flow path pipe 10 from the inflow port 100 passes through the hole 134 of the substrate 132 and is changed in flow by the shielding surface 130 which is the inner surface of the member 133, and the plurality of openings 131 provided in the member 133 are provided. Pass through.

It is preferable that the portion of the shielding surface 130 farthest from the inflow port 100 is farther from the inflow port 100 than the portion of the plurality of openings 131 farthest from the inflow port 100. As a result, the flow of the fluid changed by the shielding surface 130 becomes complicated, the residence time of the fluid in the flow path 102 can be more averaged, and the irradiation time of ultraviolet rays can be averaged.

In the example shown in FIGS. 3A, 5A, and 5B, the shielding surface 130 of the diffusion member 13a has a dome shape, and the portion farthest from the inflow port 100 (dome-shaped tip) is the inflow port of the opening 131. It is farther from the inflow port 100 than the part farthest from 100.

6A and 6B are perspective views of the diffusion member 13b, which is an example of the diffusion member 13, as viewed from different directions. The diffusion member 13b includes an annular substrate 132, a plate member 135 having a shielding surface 130 facing the substrate 132, and a plurality of members that divide the flow of fluid passing through the holes 134 of the substrate 132 before being blocked by the shielding surface 130. It has 136 wings.

In the diffusion member 13b, the surface of the plate member 135 on the inflow port 100 side is the shielding surface 130.

The plurality of wings 136 are provided so that the fluid flowing from the inflow port 100 flows along the surface thereof, for example, the surface thereof is perpendicular to the thickness direction of the substrate 132. Further, as shown in FIGS. 6A and 6B, the plurality of wings 136 are provided so as to extend from the central portion, and the frame is formed by the edges of the plurality of wings 136, the substrate 132, and the plate member 135. The plurality of openings become the plurality of openings 131.

The fluid flowing into the flow path pipe 10 from the inflow port 100 passes through the holes 134 of the substrate 132, is divided into a plurality of blades 136, and then the flow is changed by the shielding surface 130 of the plate member 135, and a plurality of fluids are changed. It passes through the opening 131.

The planar shape of each of the wings 136 (the shape seen from the thickness direction of the substrate 132) may be curved as shown in FIGS. 6A and 6B. As a result, the flow of the fluid flowing out from the diffusion member 13b can be made more complicated, the residence time of the fluid in the flow path 102 can be more averaged, and the irradiation time of ultraviolet rays can be averaged.

The shielding surface 130 of the plate member 135 may have a concave shape (for example, a dome shape, a conical shape, a pyramidal shape, a truncated cone shape, a truncated cone shape). In this case, the portion of the shielding surface 130 farthest from the inflow port 100 is farther from the inflow port 100 than the portion of the opening 131 farthest from the inflow port 100. As a result, the flow of the fluid changed by the shielding surface 130 becomes complicated, the residence time of the fluid in the flow path 102 can be more averaged, and the irradiation time of ultraviolet rays can be averaged.

FIG. 7 is a schematic view showing the diffusion member 13c, which is an example of the diffusion member 13, and its peripheral members. In FIG. 7, the diffusion member 13c, the bolt 20, and the nut 21 are shown as side views, and the other members are shown in cross section.

The diffusion member 13c has a diffusion plate 137 for diffusing the fluid that has passed through the plurality of openings 131. The diffusion plate 137 is a plate-shaped member provided so as to face the inflow port 100, and by using the diffusion plate 137, the flow of the fluid after passing through the plurality of openings 131 can be complicated.

In the diffusion member 13c shown in FIG. 7, the area inside the plurality of openings 131 on the surface of the diffusion plate 137 on the inflow port 100 side is the shielding surface 130. In the diffusion member 13b shown in FIG. 6, the diameter of the plate member 135 can be increased to be used as the diffusion plate 137 including the shielding surface 130.

When the diffusion member 13c is used, in order to suppress a decrease in the flow velocity of the fluid in the flow path pipe 10 and an increase in the pressure in the flow path pipe 10, the flow path 102 portion of the flow path pipe 10 with respect to the area A1 of the inflow port 100. It is preferable that the total area of the gap between the inner wall and the diffuser plate 137 and the area (opening area) of the plurality of openings 131 is large to some extent. For example, the value A3-A6 obtained by subtracting the area of the diffuser plate 137 (referred to as A6) from the radial cross-sectional area A3 of the flow path 102 is equal to or larger than the area A1 of the inflow port 100, and the total of the plurality of openings 131. It is preferable that the area A5 is equal to or larger than the inflow area A1. Arrows A1, A3, and A6 in FIG. 7 indicate the positions of cross sections related to areas A1, A3, and A6, respectively.

The diffusion member 14 is a member that diffuses the flow of the fluid toward the outlet 101 in the flow path 102, and flows by the shielding surface 140 that blocks the flow of the fluid toward the outlet 101 in the flow path 102 and the shielding surface 140. Has an opening 141 through which the altered fluid passes. The number of openings 141 included in the diffusion member 14 may be singular or plural.

The shielding surface 140 is a surface facing the opposite side of the outlet 101, and prevents the fluid from flowing into the outlet 101 from the vertical direction. The fluid whose flow is blocked by the shielding surface 140 passes through the opening 141 and goes to the outflow port 101 so as to bypass the shielding surface 140.

Therefore, the diffusion member 14 can be used to prevent the fluid from flowing linearly into the outlet 101, and the residence time of the fluid in the flow path 102 can be averaged. As a result, the time during which the ultraviolet rays emitted from the light source 15 are irradiated to the fluid can be averaged, and sterilization and the like can be effectively performed.

The diffusion member 14 may have the same structure as the diffusion member 13. For example, when the diffusion member 13a shown in FIGS. 5A and 5B is used as the diffusion member 14, the outer surface of the dome-shaped member 133 functions as the shielding surface 140, and the opening 131 functions as the opening 141.

Further, when the diffusion member 13b shown in FIGS. 6A and 6B is used as the diffusion member 14, the outer surface of the plate member 135 functions as the shielding surface 140, and the opening 131 functions as the opening 141. The plurality of wings 136 form a flow path for the fluid after passing through the opening 141.

Further, the diffusion member 14 may have a diffusion plate 137 as in the diffusion member 13c shown in FIG. 7. In this case, the diffusion plate 137 is provided so as to face the outlet 101, and the surface of the diffusion plate 137 opposite to the outlet 101 functions as a shielding surface 140.

The diffusing member 14 may be installed in the flow path 102, but in order to prevent the ultraviolet rays emitted from the light source 15 from being blocked by the diffusing member 14, the diffusing member 14 is prevented from protruding into the flow path 102, for example, FIG. As shown in FIG. 3B, it is preferably installed in the flow path connecting the flow path 102 and the outflow pipe 12. In the example shown in FIGS. 2 and 3B, a part of the diffusion member 14 (for example, the substrate 132 when the diffusion members 13a and 13b are used as the diffusion member 14) is sandwiched between the flow path pipe 10 and the outflow pipe 12. The scattering member 14 is fixed.

Further, when the diffusion member 14 does not protrude into the flow path 102, the resistance to the flow of the fluid becomes larger than when it protrudes, and the residence time of the fluid in the flow path 102 of the fluid can be increased. This is because the flow path connecting the flow path 102 and the outflow pipe 12 is narrower than the flow path 102, so that the projected area of the shielding surface 140 with respect to the direction of the fluid flow is large.

When installed in the flow path 102, the diffusion member 14 is preferably made of a material that does not absorb ultraviolet rays, that is, a material that transmits or reflects ultraviolet rays. For example, it is preferably made of a material that transmits ultraviolet rays, such as quartz glass and fluororesin.

FIG. 8 is a schematic view showing a diffusion member 14a, which is an example of the diffusion member 14, and peripheral members thereof. In FIG. 8, the diffusion member 14a, the bolt 24, and the nut 25 are shown as side views, and the other members are shown in cross section.

The opening 141 of the diffusion member 14a is located in the flow path 102 and does not face the inflow port 100. Therefore, the fluid flowing from the inflow port 100 side in the flow path 102 does not linearly pass through the opening 141. As a result, the residence time of the fluid in the flow path 102 can be further averaged, and the irradiation time of ultraviolet rays can be averaged.

The diffusion member 14a and the flow path pipe 10 are fixed by, for example, a screw structure. In this case, for example, the outer peripheral side surface of the substrate of the diffusion member 14a (the member corresponding to the substrate 132 of the diffusion members 13a and 13b) and the corresponding portion of the flow path pipe 10 are threaded.

In the fluid sterilizer 1, only one of the diffusion member 13 and the diffusion member 14 may be used, but by using both, the fluid can flow linearly from the inflow port 100 to the outflow port 101. It can effectively hinder and more average the dwell time of the fluid in the flow path 102.

(Effect of embodiment)
According to the fluid sterilizer 1 according to the above-described embodiment, by using at least one of the diffusion member 13 and the diffusion member 14, the fluid in the flow path 102 can be used without complicating the structure or increasing the size. The residence time can be averaged and the efficiency of sterilization by irradiation with ultraviolet rays can be improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be carried out within a range that does not deviate from the gist of the invention. In addition, the components of the above-described embodiment can be arbitrarily combined within a range that does not deviate from the gist of the invention.

Further, the above-described embodiment does not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

Provided is a fluid sterilizer having a structure capable of averaging the residence time of a fluid in a flow path and improving the efficiency of sterilization by irradiation with ultraviolet rays without complicating or increasing the size of the structure.

1 Fluid sterilizer 10 Flow pipe 11 Inflow pipe 12 Outflow pipe 13, 13a, 13b, 13c, 14, 14a Diffusion member 15 Light source 100 Inflow port 101 Outlet 102 Flow path 130, 140 Shielding surface 131, 141 Opening 136 wings 137 diffuser

Claims (11)

An inflow port into which the fluid flows in, an outflow port from which the fluid flows out, and a flow path pipe having a flow path for sterilizing the fluid.
A light source that irradiates the flow path with ultraviolet rays,
A first diffusion member installed at the inflow port and diffusing the flow of the fluid flowing into the flow path from the inflow port, and a first diffusion member installed at the outflow port toward the outflow port in the flow path. With at least one of the second diffusing members that diffuse the flow of fluid,
With
The flow can be changed by the first shielding surface facing the inflow port and the first shielding surface in which the first diffusion member blocks the flow of the fluid flowing into the flow path from the inflow port. It has a plurality of first openings through which the fluid passes.
The flow can be changed by the second shielding surface facing the opposite side of the outlet, and the second shielding surface, which blocks the flow of the fluid toward the outlet in the flow path. Has a second opening through which the fluid has passed.
Fluid sterilizer. The value A2 / A1 of the ratio of the area A2 of the first shielding surface to the area A1 of the inflow port is 1/4 or more.
The fluid sterilizer according to claim 1. The portion of the first shielding surface farthest from the inlet is farther from the inlet than the portion of the plurality of first openings farthest from the inlet.
The fluid sterilizer according to claim 1 or 2. A value obtained by subtracting the radial cross-sectional area A4 of the first diffusion member passing through the point farthest from the inflow port of the plurality of first openings from the radial cross-sectional area A3 of the flow path. A4 is the inflow area A1 or more, and the total area A5 of the plurality of first openings is the inflow area A1 or more.
The fluid sterilizer according to any one of claims 1 to 3. The first diffusing member has a first diffusing plate facing the inflow port that diffuses the fluid that has passed through the plurality of first openings.
The fluid sterilizer according to any one of claims 1 to 4. The value A3-A6 obtained by subtracting the area A6 of the first diffusion plate from the area A3 of the radial cross section of the flow path is equal to or larger than the area A1 of the inflow port and of the plurality of first openings. The total area A5 is equal to or greater than the inflow area A1.
The fluid sterilizer according to claim 5. The first diffusing member has a plurality of first wings that disrupt the flow of the fluid before being blocked by the first shielding surface.
The fluid sterilizer according to any one of claims 1 to 6. The second diffusion member has a second plate-like member facing the outlet.
The surface of the second plate-shaped member opposite to the outlet constitutes the second shielding surface.
The fluid sterilizer according to any one of claims 1 to 7. The second diffusing member has a plurality of second wings that form a flow path for the fluid after passing through the second opening.
The fluid sterilizer according to any one of claims 1 to 8. The second opening of the second diffusion member is located in the flow path and does not face the inflow port.
The fluid sterilizer according to any one of claims 1 to 8. The second diffusion member was installed so as not to protrude into the flow path.
The fluid sterilizer according to any one of claims 1 to 10.

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