CN113995859A

CN113995859A - Fluid sterilizing device

Info

Publication number: CN113995859A
Application number: CN202110557510.9A
Authority: CN
Inventors: 青孝次; 伊藤浩史
Original assignee: Toyoda Gosei Co Ltd
Current assignee: Toyoda Gosei Co Ltd
Priority date: 2020-07-28
Filing date: 2021-05-21
Publication date: 2022-02-01
Also published as: JP2024133734A; JP2023171422A; JP2022024609A; JP7525025B2; JP7405035B2

Abstract

The invention provides a fluid sterilization device (1) which sterilizes a fluid such as water by irradiating ultraviolet light, wherein the manufacturing cost can be reduced even if a fluorine resin is used as a material of a flow passage pipe through which the fluid flows. The disclosed device is provided with: a flow channel tube (10) having a flow channel (101), an inlet (102), and an outlet (103); and an ultraviolet light irradiation module (14) for irradiating ultraviolet light into the flow path, wherein the flow path pipe comprises: a tubular 1 st part (11) and a 2 nd part (12) connected with one end of the 1 st part, wherein the 1 st part is composed of a fluororesin for reflecting ultraviolet light emitted from an ultraviolet light irradiation module, and the 2 nd part comprises: an installation part (121) for installing the ultraviolet irradiation module and an outlet, wherein a reflecting piece (17) is arranged on the inner surface of the 2 nd part which becomes the inner wall of the flow path, and the reflecting piece is made of fluororesin for reflecting the ultraviolet light emitted from the ultraviolet irradiation module.

Description

Fluid sterilizing device

Technical Field

The present invention relates to a fluid sterilization device.

Background

Conventionally, a fluid sterilization apparatus for sterilizing a fluid such as water by irradiation with ultraviolet light is known (for example, see patent document 1). The fluid sterilization device of patent document 1 includes a housing having a flow path through which a fluid to be sterilized flows in an axial direction, an inlet through which the fluid flows, and an outlet through which the fluid flows out, the housing being provided with the inlet at one end in the axial direction, and a light source module device that generates ultraviolet light being attached to the other end of the housing.

The wavelength of ultraviolet light generated by the light source module device is 240nm to 380nm, and stainless steel is used as a material of the case to which the inner surface is irradiated with ultraviolet light.

Patent document 1: japanese patent laid-open No. 2020 and 89462

In the fluid sterilization device described in patent document 1, a material having excellent resistance to ultraviolet light and excellent reflectance, such as a fluororesin, is used as a material of the case whose inner surface is irradiated with ultraviolet light.

However, the fluororesin is an expensive material. In particular, PTFE (polytetrafluoroethylene), which is a fluororesin having a wavelength region (less than 280nm) called UV-C having a high bactericidal effect and excellent ultraviolet reflectance, cannot be usually melt-processed because of its very high melt viscosity, and therefore, in order to process the PTFE powder into a desired shape, it is necessary to cut the PTFE powder from a block produced by compressing and firing the PTFE powder, which results in very high material cost and processing cost.

Therefore, in the fluid sterilization device as described in patent document 1, if the material of the case is simply replaced with the fluororesin, the ultraviolet light reflectance of the case is high, and therefore, the sterilization efficiency is high, but the manufacturing cost is very high.

Disclosure of Invention

The present invention aims to provide a fluid sterilization device which sterilizes a fluid such as water by irradiating ultraviolet light, wherein the manufacturing cost can be reduced even if a fluororesin is used as a material of a flow path pipe through which the fluid flows.

In order to achieve the above object, one aspect of the present invention provides the following fluid sterilizing apparatuses [1] to [6 ].

[1] A fluid sterilization device is provided with: a channel tube having a channel for flowing a fluid to be sterilized, an inlet for allowing the fluid to flow into the channel, and an outlet for allowing the fluid to flow out of the channel; and an ultraviolet light irradiation module that irradiates ultraviolet light into the flow path, the flow path tube including: a tubular 1 st portion and a 2 nd portion connected to one end of the 1 st portion, the 1 st portion being made of a fluororesin that reflects ultraviolet light emitted from the ultraviolet light irradiation module, the 2 nd portion having a mounting portion for mounting the ultraviolet light irradiation module, the 2 nd portion further having the inflow port or the outflow port, a sheet-shaped reflecting member being provided along an inner surface of the 2 nd portion that becomes an inner wall of the flow path, the reflecting member being made of a fluororesin that reflects ultraviolet light emitted from the ultraviolet light irradiation module.

[2] In the fluid sterilizer according to [1], the reflector is a sheet having a hole through which the fluid passes and provided along an inner surface of the 2 nd portion.

[3] In the fluid sterilizer according to [2], the reflector is a rectangular sheet that is annularly rolled along the inner surface of the 2 nd part.

[4] In the fluid sterilizing apparatus according to item [2] or [3], an area of the hole is larger than an area of the inflow port and an area of the outflow port.

[5] In the fluid sterilizer according to any one of [1] to [4], the 2 nd part has the outlet, an end portion of the 1 st part opposite to an end portion on the 2 nd part side is covered with a flat plate-shaped diffusion plate, the diffusion plate has a hole through which the fluid passes at a position apart from a center thereof and diffuses the fluid flowing in from the inlet, and the diffusion plate is made of a fluororesin that reflects ultraviolet light emitted from the ultraviolet light irradiation module.

[6] The fluid sterilizing apparatus according to any one of [1] to [5], wherein the 1 st part and the 2 nd part are made of polytetrafluoroethylene.

According to the present invention, it is possible to provide a fluid sterilization device that sterilizes a fluid such as water by irradiation with ultraviolet light, in which the manufacturing cost can be suppressed even if a fluororesin is used as a material of a flow path pipe through which the fluid flows.

Drawings

Fig. 1 is a perspective view of a fluid sterilization device according to an embodiment of the present invention.

Fig. 2 (a) and (b) are a side view of the fluid sterilizing apparatus as viewed from the longitudinal direction and a side view as viewed from a direction orthogonal to the longitudinal direction, respectively.

Fig. 3 is a sectional view of the fluid sterilization device taken along a sectional line a-a shown in fig. 2 (a).

Fig. 4 (a) is a plan view of a reflector made of a rectangular sheet, and fig. 4 (b) is a perspective view of a reflector made of a rectangular sheet in a state of being rolled up in a ring shape.

Fig. 5 (a) and (b) are a plan view and a cross-sectional view of an example of the diffuser plate.

Fig. 6 (a) and (b) are a plan view and a cross-sectional view of another example of the diffuser plate.

Description of the reference numerals

A fluid sterilization device; a flow conduit; a flow path; a flow inlet; a flow outlet; part 1; part 2; an installation part; part 3; an ultraviolet light irradiation module; an inflow tube; an outflow tube; a reflector; a hole; a diffuser plate; a hole; a housing.

Detailed Description

[ embodiment ] (Structure of fluid sterilizer)

Fig. 1 is a perspective view of a fluid sterilizer 1 according to an embodiment of the present invention. Fig. 2 (a) and (b) are a side view of the fluid sterilizing apparatus 1 as viewed from the longitudinal direction and a side view as viewed from a direction orthogonal to the longitudinal direction, respectively. Fig. 3 is a sectional view of the fluid sterilizer 1 taken along a sectional line a-a shown in fig. 2 (a).

The fluid sterilization apparatus 1 is an apparatus for sterilizing a fluid (mainly a liquid such as water) and inhibiting the growth of bacteria, and includes: a channel tube 10 having a channel 101 for flowing a fluid to be sterilized, an inlet 102 for allowing the fluid to flow into the channel 101, and an outlet 103 for allowing the fluid to flow out of the channel 101; and an ultraviolet light irradiation module 14 that irradiates ultraviolet light into the flow path 101.

The flow path pipe 10 includes: a cylindrical 1 st part 11; a 2 nd part 12 connected to one end of the 1 st part 11 and having an outflow port 103; and a 3 rd section 13 connected to the other end of the 1 st section 12 and having an inflow port 102. Here, the inner surfaces of the 1 st section 11, the 2 nd section 12 and the 3 rd section 13 are mainly the inner surfaces of the 1 st section 11 and the 2 nd section 12 constituting the inner wall of the flow path 101.

The 1 st part 11 is made of a fluororesin that reflects ultraviolet light emitted from the ultraviolet light irradiation module 14. Therefore, the light emitted from the ultraviolet light irradiation module 14 can be efficiently reflected by the inner surface of the 1 st part 11 constituting the inner wall of the flow path 101. Here, the fluororesin used as the material of the 1 st part 11 is a fluororesin having high resistance to ultraviolet light and reflectance such as PTFE, PFA (perfluoroalkoxyalkane), PVF (polyvinyl fluoride), PVDF (polyvinylidene fluoride), and the like, and is generally white.

In particular, by using PTFE having excellent reflectance against ultraviolet light in the UV-C wavelength region (less than 280nm) (hereinafter, referred to as UVC light) as the material of the 1 st portion 11, it is possible to efficiently perform sterilization using the ultraviolet light irradiation module 14 that generates UVC light.

Since the shape of the 1 st part 11 is a simple shape such as a cylindrical shape, commercially available general-purpose fluororesin tubes and the like can be almost directly used. In order to further reduce the number of working steps for general-purpose products such as pipes, the shape of the 1 st portion 11 is preferably cylindrical with no irregularities on the inner and outer surfaces.

The 2 nd part 12 has: a mounting part 121 for mounting the ultraviolet irradiation module 14 and the outflow port 103. Further, a sheet-like reflecting member 17 is provided along the inner surface of the 2 nd portion 12 which becomes the inner wall of the flow path 101, and the reflecting member 17 is made of a fluororesin which reflects the ultraviolet light emitted from the ultraviolet light irradiation module 14.

The 2 nd part 12 has an opening 123 for coupling with the 1 st part 11, and the 1 st part 11 is coupled with the 2 nd part 12 by fitting one end of the 1 st part 11 inside the opening 123. Here, in order to prevent the fluid from leaking from the boundary surface between the 1 st part 11 and the 2 nd part 12, a seal member such as an O-ring 201 is preferably used at the overlapping portion of the 1 st part 11 and the 2 nd part 12.

The ultraviolet light irradiation module 14 is attached to the 2 nd part 12 by fastening a heat sink 146 and a cover 147 of the ultraviolet light irradiation module 14, which will be described later, to the attachment portion 121 of the 2 nd part 12 with screws 148, for example. The light emitted from the ultraviolet light irradiation module 14 passes through the opening 122 included in the mounting portion 121 and irradiates the fluid in the flow path 101. The opening 122 is closed by the ultraviolet irradiation module 14, and water does not leak from the opening 122.

In the example shown in fig. 1 to 3, the outlet tube 16 is connected to the opening 124 of the 2 nd part 12 on the outlet 103 side. The outlet tube 16 is fitted and fixed inside the opening 124, and the opening of the outlet tube 16 opposite to the opening 124 functions as the outlet 103. In this case, in order to effectively prevent the fluid from leaking from the boundary surface between the 2 nd part 12 and the outlet pipe 16, a seal tape or the like is preferably wound around the portion of the outlet pipe 16 fitted into the opening 124.

The reflecting member 17 is provided, for example, by providing a sheet made of fluororesin along the inner surface of the 2 nd part 12 or coating the inner surface of the 2 nd part 12 with a paint made of fluororesin. To prevent ultraviolet light from leaking out of the gap between the reflector 17 and the 1 st portion 11, the reflector 17 preferably contacts the end of the 1 st portion 11 without a gap. Furthermore, the reflective member 17 may be in close contact with the inner surface of the 2 nd part 12 or may have a gap between it and the inner surface of the 2 nd part 12.

When the reflector 17 is a sheet made of fluororesin, it has a hole 171 through which a fluid passes. The hole 171 may be one or an aggregate of a plurality of holes. 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 area of the hole 171 (the total area of the plurality of holes in the case of an aggregate of the holes) is preferably larger than the areas of the inlet port 102 and the outlet port 103.

As the fluororesin as the material of the reflector 17, the same fluororesin that reflects the light emitted from the ultraviolet light irradiation module 14 as the material of the 1 st part 11 can be used. In particular, by using PTFE as the material of the reflector 17, the ultraviolet irradiation module 14 that generates UVC light can be used to efficiently sterilize.

In addition, since the reflector 17 blocks most of the ultraviolet light toward the 2 nd portion 12, deterioration of the 2 nd portion 12 due to exposure to ultraviolet light can be suppressed. Thus, the 2 nd portion 12 need not be resistant to ultraviolet light, and the range of choice of material for the 2 nd portion 12 is expanded. For example, polycarbonate can be used as the material of the 2 nd part 12.

In order to efficiently irradiate the light emitted from the ultraviolet irradiation module 14 into the flow channel 101, it is preferable that the opening 122 for receiving the light emitted from the ultraviolet irradiation module 14 in the 2 nd part 12 be opposed to the opening 123 for connecting to the 1 st part 11, and in this case, the region in the 2 nd part 12 where the reflector 17 is provided be cylindrical. Therefore, a rectangular sheet made of a fluororesin can be annularly rolled along the inner surface of the 2 nd portion 12 to be used as the reflector 17.

In this case, the reflector 17 and the 2 nd part 12 preferably have a misalignment preventing structure for preventing misalignment of the reflector 17 with respect to the 2 nd part 12. For example, the reflector 17 preferably has a notch 172 for preventing misalignment. The notch 172 is fitted into the rib (protrusion) 125 provided on the inner surface of the 2 nd part 12, whereby the reflector 17 can be prevented from being displaced with respect to the 2 nd part 12. Further, since the rib 125 of the 2 nd part 12 is not covered with the reflector 17, it is preferably provided on the ultraviolet light irradiation module 14 side where ultraviolet light does not easily reach.

Fig. 4 (a) is a plan view of the reflector 17 formed of a rectangular sheet, and fig. 4 (b) is a perspective view of the reflector 17 formed of a rectangular sheet wound in a ring shape. In the example shown in fig. 4 (a) and (b), the hole 171 is formed by an aggregate of four holes.

Further, the light emitted from the ultraviolet light irradiation module 14 generally includes visible light in addition to ultraviolet light. Therefore, the material of the 2 nd portion 12 can visually confirm the visible light leaking from the hole 171 of the reflector 17 and transmitted through the 2 nd portion 12 by using a material that transmits visible light, for example, transparent polycarbonate, and confirm the operation of the ultraviolet light irradiation module 14.

The 3 rd portion 13 has a shape covering the end of the 1 st portion 11 on the 3 rd portion 13 side, and has an inlet 102.

The 3 rd part 13 has an opening 131 for coupling with the 1 st part 11, and the 1 st part 11 is coupled with the 3 rd part 13 by fitting one end of the 1 st part 11 inside the opening 131. Here, in order to prevent the fluid from leaking from the boundary surface between the 1 st part 11 and the 3 rd part 13, a seal member such as an O-ring 202 is preferably used at the overlapping portion between the 1 st part 11 and the 3 rd part 13.

In the example shown in fig. 1 to 3, the inlet pipe 15 is connected to the opening 132 of the 3 rd portion 13 on the inlet 102 side. The inflow pipe 15 is fitted and fixed inside the opening 132, and the opening of the inflow pipe 15 opposite to the opening 132 functions as the inflow port 102. In this case, in order to effectively prevent the fluid from leaking from the boundary surface between the 3 rd portion 13 and the inflow pipe 15, a seal tape or the like is preferably wound around the portion of the inflow pipe 15 fitted into the opening 132.

The functions of the inlet 102 and the outlet 103 of the flow path pipe 10 may be switched. That is, the fluid may be introduced into the flow channel 101 from the outlet 103 of the 2 nd part 12 and the fluid may be discharged from the inlet 102 of the 3 rd part 13.

When a fluid is made to flow into the flow channel 101 from the inlet 102 and flow out from the fluid outlet 103, that is, when the inlet 102 functions as an inlet and the outlet 103 functions as an outlet, it is preferable that the end of the 1 st part 11 on the 3 rd part 13 side (the end opposite to the end on the 2 nd part 12 side), that is, the inlet of the fluid in the 1 st part 11 is covered with a flat plate-shaped diffusion plate 18.

Fig. 5 (a) and (b) are a plan view and a cross-sectional view of an example of the diffuser plate 18. The cross section of the diffuser plate 18 shown in fig. 5 (B) is a cross section taken along the cutting line B-B shown in fig. 5 (a).

The diffusion plate 18 has a hole 181 for passing a fluid therethrough at a position away from the center thereof, and diffuses the fluid flowing in from the inlet 102. The hole 181 is not provided at the center of the diffusion plate 18, but is provided near the outer peripheral portion of the diffusion plate 18 or at a position in contact with the outer peripheral portion, and therefore, the fluid passing through the hole 181 flows into the vicinity of the inner wall of the 1 st portion 11.

In general, the flow velocity of the fluid flowing through the flow path becomes smaller due to frictional resistance as the flow velocity becomes closer to the inner wall of the flow path, and the fluid flows into the vicinity of the inner wall of the 1 st section 11 by using the diffusion plate 18 in a portion where the difference in flow velocity from the center of the flow path becomes larger, whereby the flow velocity in the vicinity of the inner wall of the 1 st section 11 can be made relatively large, and the difference in flow velocity from the vicinity of the center of the 1 st section 11 to the vicinity of the inner wall can be made small. This makes the residence time of the fluid in the flow path 101 uniform, and therefore, variation in the irradiation time of ultraviolet light due to the difference in the flow path of the fluid is reduced, and sterilization can be performed efficiently.

In order to make the fluid flow into the vicinity of the inner wall of the 1 st portion 11 as uniformly as possible, it is preferable that the plurality of holes 181 be arranged at equal intervals along the circumferential direction of the diffusion plate 18. In order to suppress a decrease in the flow velocity of the fluid in the flow channel tube 10 and an increase in the pressure in the flow channel tube 10, the area of the hole 181 (the total area of the plurality of holes 181 when provided) is preferably larger than the areas of the inlet port 102 and the outlet port 103.

In order to improve the sterilization efficiency, the diffusion plate 18 is preferably made of the same fluororesin as the material of the 1 st part 11 that reflects the light emitted from the ultraviolet light irradiation module 14. In particular, by using PTFE as the material of the diffusion plate 18, sterilization can be effectively performed using the ultraviolet irradiation module 14 that generates UVC light.

In addition, in the case of using the diffusion plate 18, since the diffusion plate 18 blocks most of the ultraviolet light toward the 3 rd portion 13, deterioration of the 3 rd portion 13 due to exposure to ultraviolet light can be suppressed. Thus, the 3 rd portion 13 does not need to have resistance to ultraviolet light, and the range of choice of the material of the 3 rd portion 13 is expanded. In this case, for example, polycarbonate can be used as the material of the 3 rd portion 13.

The method of fixing the diffusion plate 18 to the fluid sterilizing apparatus 1 is not particularly limited. For example, as shown in fig. 3, the diffusion plate 18 can be fixed by being sandwiched between the 1 st part 11 and the 3 rd part 13. Here, the portion outside the broken line in fig. 5 (a) is a portion sandwiched between the 1 st portion 11 and the 3 rd portion 13.

Fig. 6 (a) and (b) are a plan view and a cross-sectional view of another example of the diffuser plate 18. The cross section of the diffuser plate 18 shown in fig. 6 (b) is a cross section taken along the cutting line C-C shown in fig. 6 (a).

As shown in fig. 6 (a) and (b), the holes 181 of the diffuser plate 18 may have an inclination that expands toward the outer circumferential side from the 3 rd portion 13 side as it approaches the 1 st portion 11 side.

Further, a diffusion member having a three-dimensional shape may be used instead of the flat plate-shaped diffusion plate 18, but since the flat plate-shaped diffusion member is simpler in structure, the manufacturing cost in the case where expensive fluororesin, particularly PTFE that needs to be cut from a block, is used as a material can be suppressed.

The housing 19 has a plate-like portion 191 parallel to the longitudinal direction of the 1 st part 11 and a plate-like portion 192 covering the 3 rd part 13, and the 1 st part 11, the 2 nd part 12, and the 3 rd part 13 can be fixed by fixing the housing 19 to the 2 nd part 12 in a state where the 3 rd part 13 is pressed toward the 1 st part 11 by the plate-like portion 192. That is, the three parts of the 1 st part 11, the 2 nd part 12, and the 3 rd part 13 can be fixed using the housing 19.

In the example shown in fig. 1 to 3, the housing 19 has a plate-like portion 193 along the surface of the 2 nd part 12 on the housing 19 side, and the housing 19 can be fixed to the 2 nd part 12 by screwing the plate-like portion 193 to the 2 nd part 12 with a screw 194. The housing 19 is made of, for example, stainless steel.

As described above, the ultraviolet irradiation module 14 is attached to the 2 nd part 12, and irradiates the fluid flowing through the flow path 101 with ultraviolet light. The ultraviolet light generated by the ultraviolet light irradiation module 14 is preferably ultraviolet light in a wavelength range (400 to 315nm) called UV-A, ultraviolet light in a wavelength range (315 to 280nm) called UV-B, or UVC light having the highest bactericidal effect among the above-mentioned UVC lights, for example.

The structure of the ultraviolet light irradiation module 14 is not particularly limited, but in the examples shown in fig. 1 to 3, the ultraviolet light irradiation module includes: a light emitting element 141 that generates ultraviolet light; a wiring substrate 142 on which the light-emitting element 141 is mounted; a cable 143 connected to the wiring of the wiring substrate 142 and used for supplying power and the like to the light emitting element 141 from the outside; a reflector 144 surrounding the light emitting element 141; a waterproof sheet 145 provided so as to cover the light emitting element 141 from above over the reflector 144; a heat sink 146 provided on the back side of the wiring substrate 142; and a cover 147 for covering the above components and fixing them. The region where the light emitting element 141 is mounted is sealed to ensure waterproofness, and light emitted from the light emitting element 141 is taken out through the waterproof sheet 145.

The light-emitting element 141 includes, for example: an LED chip (Light Emitting Diode) that generates ultraviolet Light, an LD chip (Laser Diode), and a lens for adjusting Light distribution.

A sealing member such as an O-ring 203 is used between the mounting portion 121 of the 2 nd part 12 and the cover 147 of the ultraviolet irradiation module 14, thereby preventing the fluid from leaking from the boundary surface between the 2 nd part 12 and the ultraviolet irradiation module 14.

(effects of the embodiment)

According to the fluid sterilization device 1 of the above embodiment, the 1 st part 11 of the flow path pipe 10 can be formed using a pipe made of a general-purpose fluororesin or the like, and the 2 nd part 12 can be formed using the reflector 17 made of a fluororesin, whereby the reflectance of ultraviolet light on the inner wall of the flow path 101 is increased, excellent sterilization efficiency is ensured, and the manufacturing cost can be reduced. In particular, when PTFE is used as the fluororesin, since it is not necessary to perform cutting from a PTFE block, the effect of reducing the production cost is greater.

While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. In addition, the components of the above embodiments can be arbitrarily combined without departing from the scope of the invention.

The embodiments described above do not limit the invention according to the claims. In addition, it should be noted that: the means for solving the problem of the invention is not limited to the combinations of the features described in the embodiments, and all of them are essential.

Claims

1. A fluid sterilization device is characterized by comprising:

a channel tube having a channel for flowing a fluid to be sterilized, an inlet for allowing the fluid to flow into the channel, and an outlet for allowing the fluid to flow out of the channel; and

an ultraviolet light irradiation module that irradiates ultraviolet light into the flow path,

the flow path pipe has: a cylindrical 1 st part and a 2 nd part connected to one end of the 1 st part,

the 1 st part is made of a fluororesin that reflects ultraviolet light emitted from the ultraviolet light irradiation module,

the 2 nd part has a mounting part for mounting the ultraviolet light irradiation module and has the inflow port or the outflow port,

a sheet-like reflecting member made of a fluororesin that reflects the ultraviolet light emitted from the ultraviolet light irradiation module is provided along an inner surface of the 2 nd portion that becomes an inner wall of the flow path.

2. The fluid sterilization device of claim 1,

the reflector is a sheet having holes for the fluid to pass through disposed along an inner surface of the 2 nd portion.

3. The fluid sterilization device of claim 2,

the reflecting member is a rectangular sheet material that is annularly rolled along the inner surface of the 2 nd part.

4. Fluid sterilisation device according to claim 2 or 3,

the area of the hole is larger than the areas of the inflow port and the outflow port.

5. The fluid sterilizer according to any one of claims 1 to 4,

said 2 nd part is provided with said outflow opening,

an end portion of the 1 st portion opposite to the end portion on the 2 nd portion side is covered with a flat plate-shaped diffusion plate having a hole through which the fluid passes at a position apart from the center thereof and diffusing the fluid flowing in from the inlet port,

the diffusion plate is made of fluororesin that reflects the ultraviolet light emitted from the ultraviolet light irradiation module.

6. The fluid sterilizing apparatus as claimed in any one of claims 1 to 5,

the 1 st and 2 nd parts are made of polytetrafluoroethylene.