JP2022038707A - Liquid sterilizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid sterilizer which prevents air accumulation on a light source side. A liquid sterilizer 10 includes an inner pipe 21 and an outer pipe 22 arranged coaxially, a quartz plate 45 that closes the openings of the inner pipe 21 and the outer pipe 22 on one end side in the axial direction, and a quartz plate 45. It has a light source 67 that irradiates the sterilization treatment space 39 in the inner tube 21 with ultraviolet light through the inner tube 21. One end of the inner pipe 21 is a small diameter portion 25. An annular space 29 is formed between the outer tube 22 and the outer tube 22. The end surface 43 of the small diameter portion 25 has a small diameter portion 25 that opens into the end surface 43 and penetrates in the radial direction. The annular space 29 is formed between the outer tube 22 and the annular space 29. The plurality of notch grooves 50 penetrate in the radial direction while opening to the end surface on one end side of the inner tube 21 to communicate the annular space 29 and the sterilization treatment space 39. The introduction port 34 and the outlet port 35 communicate with the sterilization treatment space 39 and the annular space 29, respectively. [Selection diagram] FIG. 2B

Description

The present invention relates to a liquid sterilizer that sterilizes a liquid such as water with ultraviolet light.

A liquid sterilizer is known that sterilizes a liquid to be sterilized by irradiating the liquid flowing in the pipe with ultraviolet light from the outside to the inside in the axial direction or the radial direction of the pipe while flowing the liquid to be sterilized into the pipe. (Example: Patent Document 1).

The liquid sterilizer of Patent Document 1 has a double tube structure of an inner tube and an outer tube. The annular space between the inner pipe and the outer pipe is divided into one end side and the other end side in the axial direction by a sealing material, and the annular spaces on the one end side and the other end side are one end side and the other end side of the outer pipe, respectively. It communicates with the outlet and the inlet provided on the side wall. The liquid to be sterilized is introduced into the annular space on the other end side from the introduction port, and then introduced into the inner pipe through the through hole at the other end of the inner pipe. Then, in the inner tube, it flows axially from the other end side to the one end side, and at that time, it is irradiated with ultraviolet light and sterilized. The liquid after sterilization enters the annular space on one end side from the through hole on one end side of the inner tube, and then is taken out from the outlet.

Japanese Unexamined Patent Publication No. 2019-188128

The problems of the liquid sterilizer of Patent Document 1 are as follows.

The through hole formed on one end side of the inner pipe and penetrating in the radial direction is formed at a position close to one end of the inner pipe, but is formed at a predetermined distance from one end. As a result, an air pool is generated in the space between one end of the inner pipe and the through hole in the axial direction. The air pool exists as a space having a small refractive index between the light source and the liquid to be sterilized. That is, a total internal reflection surface is generated in the path until the ultraviolet light is incident on the liquid, which causes a decrease in the sterilization efficiency of the device. In particular, when the liquid sterilizer is placed vertically, the light source side needs to be on the upper side, not the lower side, in order to secure the irradiation time of the ultraviolet light on the liquid in the inner tube, so that one end side of the inner tube. The air pool in the air increases.

An object of the present invention is to provide a liquid sterilizer that prevents air accumulation on the light source side.

The liquid sterilizer of the present invention is
An inner tube having a first notched groove that opens at one end and the other end in the axial direction and penetrates radially through the end face of the one end.
An outer pipe having a first annular space communicating with the first notch groove and accommodating the inner pipe between the inner pipe and the inner pipe on the one end side.
A first transmission plate capable of transmitting ultraviolet light and blocking the opening on the one end side of the outer tube, and a first transmission plate.
A first light source that irradiates ultraviolet light toward the opening on the one end side of the inner tube through the first transmission plate, and
An introduction port provided in the outer pipe and communicating with the inner pipe on the other end side,
An outlet provided on the side wall of the outer pipe and communicating with the first annular space,
To prepare for.

According to the present invention, the inner tube has a first notch groove that penetrates radially through the end face on one end side. As a result, the liquid is led out to the first annular space along the one end of the inner pipe through the first notch groove in the radial direction, so that air pooling on one end side of the inner pipe is prevented.

It is a perspective view of the liquid sterilizer. It is a front view of the liquid sterilizer. It is a vertical sectional view of a liquid sterilizer. It is explanatory drawing which shows the component of the light source part which closes an opening on one end side of an inner tube and an outer tube in an disassembled state. It is explanatory drawing which shows the component of the light source part which closes an opening on one end side of an inner tube and an outer tube in an assembled state. It is a figure which looked at the end part on the one end side in the axial direction of a liquid sterilizer from the direction facing the outlet. It is sectional drawing of C4B-C4B of FIG. 4A. It is a figure which showed the flow velocity distribution of the water inside the housing part of a liquid sterilizer step by step. It is a figure which shows the modification of the transition part of the liquid sterilizer of Embodiment. This is a modification of the water stop O-ring of the liquid sterilizer. It is a vertical sectional view of the liquid sterilizer of 2nd Embodiment. It is a vertical sectional view of the liquid sterilizer of the modification of 2nd Embodiment.

Hereinafter, a plurality of embodiments of the present invention will be described. Needless to say, the present invention is not limited to these embodiments. It should be noted that the same reference numerals are used for the components common to the plurality of embodiments, and the components described in the preceding embodiments with the same reference numerals will be omitted in the later embodiments.

(First Embodiment / Configuration)
FIG. 1 is a perspective view of the liquid sterilizer 10. 2A is a front view of the liquid sterilizer 10, and FIG. 2B is a vertical sectional view of the liquid sterilizer 10. The liquid sterilizer 10 includes a housing portion 11, a light source portion 12, an introduction port portion 13, and an outlet portion 14. The liquid sterilizer 10 is typically arranged so that the axial direction is aligned in the vertical direction with the light source unit 12 on the upper side (vertical installation).

The liquid sterilizer 10 is installed in, for example, a water storage tank such as an ice maker, a water pipe, a water heater, a water server, a circulation device (cooling water for a chiller), and a drink server. The sterilized 32 water or the like is usually provided for drinking. In addition, sterilization in the circulation device is performed in order to prevent the viscosity of the circulating water from increasing and causing power loss when the bacteria in the circulating water propagate.

The introduction port 13 and the outlet port 14 are threaded in the peripheral portion in order to connect to a pipe (not shown) in the device in which the liquid sterilizer 10 is deployed (FIG. 2A).

The light source unit 12 is attached to the housing unit 11 with the central axis aligned with the central axis of the housing unit 11 on one end side (upper end side in this embodiment) in the axial direction of the liquid sterilizer 10. The introduction port 13 is provided at the other end (in this embodiment, the lower end) of the housing 11 in the axial direction. The outlet portion 14 is provided on the side portion of the housing portion 11 at a predetermined distance from one end to the other end of the housing portion 11 in the axial direction.

The housing portion 11 includes an inner inner tube 21 arranged coaxially and an outer outer tube 22. Both the inner pipe 21 and the outer pipe 22 are straight pipe types. The inner pipe 21 is open on both sides in the axial direction. The outer tube 22 is open only on one end side in the axial direction and closed on the other end side.

The inner pipe 21 has a small diameter portion 25 on one end side and a large diameter portion 26 on the other end side in the axial direction. The transition portion 27 is formed at the boundary between the small diameter portion 25 and the large diameter portion 26 in the axial direction. In this embodiment, the transition portion 27 is formed as a step portion. That is, the outer diameter of the inner pipe 21 changes at once from the outer diameter of the small diameter portion 25 to the outer diameter of the large diameter portion 26 with the transition portion 27 as a boundary, or vice versa.

The inner tube 21 is inserted into the outer tube 22 from the opening side of the outer tube 22 and is housed in the outer tube 22. An annular space 29 is held between the outer circumference of the small diameter portion 25 of the inner pipe 21 and the inner circumference of the outer pipe 22 on one end side in the axial direction. The water stop O-rings 30a and 30b are fitted into triangular grooves formed at the other ends and one end sides of the large diameter portion 26 in the axial direction, and are fitted between the outer pipe 22 and the large diameter portion 26. Prevent the intrusion of water 53.

The inlet 34 and the outlet 35 define the inlet 13 and the outlet 14 on the inner peripheral side, respectively. The central axis of the introduction port 34 is aligned with the central axis of the inner pipe 21. An introduction side space 38 is formed in the axial direction between the introduction port 34 and the opening end on the other end side of the inner pipe 21. The sterilization treatment space 39 is defined on the inner peripheral surface of the inner pipe 21 and is connected to one end side of the introduction side space 38 on the other end side.

The introduction port 34 faces the other end side of the introduction side space 38 in the axial direction. The outlet 35 faces the annular space 29 in the radial direction. The straightening vanes 42a and 42b are arranged in the introduction side space 38 at intervals in the axial direction. The straightening vanes 42a and 42b both have straightening holes that are uniformly distributed. The diameter of the rectifying hole of the rectifying plate 42a is larger than the diameter of the rectifying hole of the rectifying plate 42b. As a result, the water 53 is roughly rectified by the rectifying plate 42a as the first step in the introduction side space 38, finely rectified by the rectifying plate 42b as the next second step, and then rectified in the sterilization processing space 39 (flow). Enter in a state where the vectors of are parallel to the axial direction).

3A and 3B are explanatory views for assembling the parts of the light source unit 12 that closes the openings on one end side of the inner tube 21 and the outer tube 22. The parts that close the opening are shown in FIGS. 3A and 3B in the disassembled and assembled states.

The inner pipe 21 and the outer pipe 22 have an end face 43 and an end face 44 at one end, respectively. The end face 43 and the end face 44 define a circular opening of the inner tube 21 and the outer tube 22 on the inner peripheral side, respectively. 3A and 3B show a state in which the end surface 43 of the inner pipe 21 is moved to one end side in the axial direction from the end surface 44 of the outer pipe 22 in order to make it easy to understand the assembly of the sealing parts.

After being fitted to the peripheral portion of the quartz plate 45, the water stop O-ring 46 is press-fitted into the inner peripheral side of the fixing nut 47 from the other end side of the fixing nut 47 to seal between the quartz plate 45 and the fixing nut 47. I do. The fixing nut 47 is screwed into the thread groove 55 at the end on one end side of the outer tube 22 and presses the quartz plate 45 toward the other end in the axial direction to seal the open end on one end side of the outer tube 22.

The outer peripheral side of the water blocking O-ring 46 at the peripheral portion of the quartz plate 45 is crimped to the inner circumference of the opening on the one end side of the outer tube 22, so that the opening on the one end side of the outer tube 22 is closed by the quartz plate 45. .. Further, the quartz plate 45 comes into surface contact with the end surface 43 of the inner tube 21 and closes the open end of the inner tube 21. It should be noted that the inner surface of the quartz plate 45 and the end surface 43 of the inner tube 21 may not be in perfect contact with each other, or may have some gaps.

Notch grooves 50 are formed at equiangular intervals in the circumferential direction on the circumferential end surface 43 at one end of the inner tube 21. The notch groove 50 opens in the end surface 43 and penetrates the peripheral wall of the inner pipe 21 in the radial direction. The notch groove 50 has, for example, a U-shaped cross section. The notch groove 50 communicates the annular space 29 and the sterilization treatment space 39 with each other at one end of the inner pipe 21.

FIG. 4A is a view of the end portion of the liquid sterilizer 10 on one end side in the axial direction as viewed from the direction facing the outlet 35. FIG. 4B is a cross-sectional view taken along the line C4B-C4B of FIG. 4A. The stepped transition portion 27 is visible from the opening of the outlet portion 14 (FIG. 4A). This has the effect of preventing the water 53 from staying in the annular space 29.

The fixing nut 47 has through holes that open on both end faces of the fixing nut 47 at both ends in the axial direction. The inner circumference on one end side of the through hole is a reduced diameter portion 64, and the inner circumference on the other end side is screwed into the thread groove 55 on the outer peripheral portion of the outer tube 22. The diameter of the quartz plate 45 is slightly smaller than the inner diameter of the outer tube 22, and as the fixing nut 47 is screwed into the thread groove 55, the quartz plate 45 is attached to the end surface 44 of the outer tube 22 via the water stop O-ring 46. It is fixed. Along with this, the other end surface of the quartz plate 45, that is, the inner surface, comes into surface contact with the end surface 43.

The annular spacer 56, the circuit board 57, and the heat sink 58 are arranged in this order from the other end side to the one end side in the axial direction, and are inserted into the through holes of the fixing nut 47. The heat sink 58 has a flange on one end side, and the flange is applied to the end surface on one end side of the fixing nut 47.

The cover 59 is applied to the end surface on one end side of the heat sink 58, and the plurality of screws 60 pass through the flanges of the cover 59 and the heat sink 58 in order from the outer surface side of the cover 59, and then the reduced diameter portion 64 of the fixing nut 47. It is screwed to the peripheral edge portion to fix the heat sink 58 to the fixing nut 47.

The light source 67 is attached to the surface side (the other end side) of the circuit board 57, and irradiates ultraviolet light toward the sterilization processing space 39. In this embodiment, only one light source 67 is shown. The number of light sources 67 mounted on the circuit board 57 is selected according to the size of the liquid sterilizer 10, the device equipped with the liquid sterilizer 10, and the like.

(First Embodiment / Material)
An example of the material of each component of the liquid sterilizer 10 is as follows.
Inner tube 21: Resin material / For example, PTFE (Teflon (registered trademark) material)
Outer tube 22: Metallic material / eg stainless steel SUS304
Quartz plate 45: Quartz waterproof O-ring 30a, 30b, 46: FKM (fluororubber)
Fixing nut 47: Al or SUS
Heat sink 58: Al or SUS
Screw 60: SUS
Cover 59: Al

(First Embodiment / Action)
Returning to FIG. 2B, the water 53 as the sterilizing liquid flows into the introduction side space 38 from the introduction port 34 and further flows into the sterilization treatment space 39 as shown by the arrow A1. On the other hand, the light source 67 emits ultraviolet light from one end side in the axial direction toward the other end side. The ultraviolet light emitted from the light source 67 passes through the quartz plate 45 and irradiates the water 53 (FIG. 4B) in the sterilization treatment space 39. The water 53 is sterilized by ultraviolet light.

When the water 53 collides with the quartz plate 45, the direction is changed from the axial direction to a right angle in the radial direction, and the water 53 enters the annular space 29 from the plurality of notch grooves 50. The water 53 flows axially from one end side to the other end side in the annular space 29 and collides with the stepped transition portion 27. Due to this collision, the direction of the flow is changed from the axial direction to the outside in the radial direction at a right angle, and the flow is discharged to the outlet 35. Then, as shown by the arrow A2, the liquid is discharged from the outlet 35 to the outside of the liquid sterilizer 10.

In FIG. 1, there is only one outlet portion 14. A plurality of outlet portions 14 may be provided in the circumferential direction of the housing portion 11. However, the work of installing the liquid sterilizer 10 in the device includes the work of connecting the pipe to the outlet portion 14. The work of connecting pipes becomes more complicated as the number of outlets 14 increases, so it is desirable that the number of outlets 14 is small. The annular space 29 has a role of reducing the number of the outlet portions 14.

In a liquid sterilizer having a general double pipe structure (a structure including a coaxial inner pipe 21 and an outer pipe 22), one end side of the inner pipe 21 is used to communicate the annular space 29 and the sterilization processing space 39 with each other. The passage formed at the end of the pipe is not a notch groove 50, but a through hole formed in the inner pipe 21 at a position separated from the end on one end side toward the other end in the axial direction. An air pool may occur between the quartz plate 45 and the through hole in the axial direction. Air causes a decrease in sterilization efficiency due to a decrease in the efficiency of ultraviolet light incident on the water 53 due to total internal reflection.

On the other hand, in the liquid sterilizer 10, since the notch groove 50 is formed in the end surface 43 of the inner tube 21, the water 53 in the sterilization treatment space 39 is annular from the inner surface of the quartz plate 45 in the axial direction. It will flow out to space 29. Even if an air pool exists between the quartz plate 45 and the notch groove 50, the water 53 continues to flow from the vicinity of the center of the quartz plate 45 to the annular space 29 through the notch groove 50 in the radial direction. The air pool is swept away and finally discharged from the outlet 35 together with the water 53. As a result, it is possible to prevent an air pool from being generated on the inner surface side of the quartz plate 45.

The residual water 53 in the annular space 29 causes the growth of bacteria. The stepped transition portion 27 (FIG. 4A) is formed at a position overlapping the outlet 35 in the axial direction. As a result, the amount of water 53 that stays on the other end side of the outlet 35 in the axial direction or remains when the pump (not shown) is stopped can be reduced or reduced to zero. In this way, it is possible to prevent the growth of bacteria in the annular space 29.

The water 53 is supplied into the liquid sterilizer 10 by a pump, but the pump is usually operated intermittently instead of continuously. When the introduction port 13 is provided on the side of the outer pipe 22, the lower end of the outer pipe 22 is below the introduction port 13 in the vertical direction, and the water 53 of the liquid sterilizer 10 is used while the pump is stopped. It remains at the bottom.

On the other hand, in the liquid sterilizer 10, the introduction port 13 is provided not on the peripheral wall of the outer pipe 22 but on the end wall on the other end side. As a result, during the suspension period of the pump, the water 53 is completely discharged from the housing portion 11 without causing the water 53 to remain. Longer pump outages can increase bacterial growth in residual water. In the liquid sterilizer 10, the water 53 discharged from the liquid sterilizer 10 is discarded in order not to use such residual water at the initial stage when the operation of the pump is restarted. In this liquid sterilizer 10, the amount of water 53 to be discarded can be reduced.

FIG. 5 is a diagram showing the flow velocity distribution of the water 53 inside the housing portion 11 of the liquid sterilizer 10 in five stages. The whitish region indicates that the flow velocity is higher.

When a through hole is formed in the peripheral wall of the inner tube 21 to communicate the annular space 29 and the sterilization treatment space 39, as described above, the sterilization treatment space 39 has a through hole-quartz plate in the axial direction. An air pool is created between 45. The air in the air pool reduces the efficiency of ultraviolet light incident on the water 53 due to total internal reflection, thereby reducing the sterilization efficiency.

On the other hand, in the liquid sterilizer 10, since the notch groove 50 is used instead of the through hole, the entire sterilization treatment space 39 including the vicinity of the quartz plate 45 is filled with water 53.

Further, the flow velocity of the water 53 in the sterilization treatment space 39 is high near the central axis of the sterilization treatment space 39 in the radial direction. This means that the irradiation time of the ultraviolet light to the water 53 flowing near the central axis is shortened. However, since the flow velocity of the water 53 flowing in the vicinity of the central axis decreases in the vicinity of the collision with the quartz plate 45, the short irradiation time is eliminated.

(Variation example of the first embodiment)
FIG. 6A is a modified example of the transition portion 27 of the liquid sterilizer 10. The transition unit 27 has been replaced by the transition unit 71. The transition portion 27 is a flat surface perpendicular to the axial direction as a step portion, whereas the transition portion 71 is formed as a tapered surface whose diameter gradually increases from one end side to the other end side in the axial direction.

That is, the transition portion 27 has a substantially zero axial dimension, whereas the transition portion 71 has a predetermined axial dimension α (α> 0). The diameter at one end of the transition portion 71 in the axial direction is equal to the outer diameter of the small diameter portion 25. The diameter at the other end of the transition portion 71 in the axial direction is equal to the outer diameter of the large diameter portion 26.

The transition portion 71 is arranged so as to at least partially overlap the outlet 35 in the axial direction. In FIG. 6A, the transition portion 71 is housed inside the outlet 35 in the axial direction, and the other end of the transition portion 71 is located at a position visible from the outlet 35. However, if the transition portion 71 is arranged so as to at least partially overlap the outlet port 35 in the axial direction, the other end of the transition portion 71 may be on the other end side of the outlet port 35 in the axial direction. ..

By making the transition portion 71 tapered, the change in direction when the water 53 changes its direction from the annular space 29 toward the outlet 35 at a right angle is facilitated.

Instead of the taper transition portion 71, the transition portion of R may be used. The transition portion of R has a shape that bulges toward the annular space 29 as a convex surface, and is formed over the entire circumferential direction of the transition portion. Similar to the transition portion 71, the transition portion of R may at least partially overlap the outlet 35 in the axial direction. The transition portion of R contributes to increasing the strength of the boundary point between the small diameter portion 25 and the large diameter portion 26 and facilitating the change in the traveling direction of the water 53 from the annular space 29 to the outlet 35.

FIG. 6B is a modified example of the water stop O-ring 30b of the liquid sterilizer 10. The waterproof O-ring 30b has been replaced with a rubber packing 76.

(Second Embodiment)
FIG. 7A is a vertical sectional view of the liquid sterilizer 80 of the second embodiment. The main differences of the liquid sterilizer 80 from the liquid sterilizer 10 are that (a) the liquid sterilizer 80 also includes a light source portion 82 on the other end side, and (b) the introduction port 83 is a housing portion 81. It is a point provided on the side portion of the other end portion of the above. The configuration of the light source unit 82 is the same as the configuration of the light source unit 12.

As a configuration corresponding to the difference in (b) above, the inner pipe 21 of the housing portion 81 has a small diameter portion 85 on the other end side in the axial direction. That is, the inner pipe 21 is divided into a small diameter portion 25, a large diameter portion 26, and a small diameter portion 85 in order from one end side to the other end side in the axial direction. The small diameter portion 25 and the small diameter portion 85 have the same axial dimensions.

An annular space 86 is formed between the outer tube 22 and the small diameter portion 85 in the radial direction. The inner pipe 21 also has a notch groove 50 having the same shape and dimensions as the notch groove 50 on the one end side at the end on the other end side in the axial direction.

The water stop O-ring 30a is fitted on the outer peripheral surface on the other end side of the large diameter portion 26 at a position on one end side of the introduction port 88 of the introduction port portion 83 in the axial direction, and seals the annular space 86 and the introduction port 88. I do. In the stepped portion as the boundary between the large diameter portion 26 and the heat sink 58, the transition portion 27 as the boundary portion between the small diameter portion 25 and the large diameter portion 26 can be seen at least partially from the outlet 35 of the outlet portion 14. Similarly, it is at least partially visible from the introduction port 88 of the introduction port portion 83.

In the liquid sterilizer 80, the water 53 enters the annular space 86 from the introduction port 83 of the housing portion 81. Then, it enters the sterilization processing space 39 from the annular space 86 through the notch groove 50 on the end surface on the other end side of the inner pipe 21, and flows in the sterilization processing space 39 from the other end side to the one end side in the axial direction. The water 53 that has reached one end side enters the annular space 29 through the notch groove 50, and then flows out of the housing portion 81 from the outlet 35.

In the liquid sterilizer 80, when the liquid sterilizer 80 is placed vertically, water 53 remains in the housing portion 11 in the range below the introduction port 88 while the pump is stopped.

However, during the operation of the liquid sterilizer 80, the water 53 in the sterilization treatment space 39 is irradiated with ultraviolet light from both sides in the axial direction. Thereby, the bactericidal power against water 53 can be enhanced.

Further, since the housing portion 81 is provided on the side portion of the housing portion 11 like the outlet portion 14, the axial dimension of the liquid sterilizer 80 can be reduced.

When the liquid sterilizer 80 is placed horizontally, the outlet portion 14 and the introduction port portion 83 can be turned downward. At that time, when the pump is stopped due to the suspension of the liquid sterilizer 80, the water 53 in the housing portion 81 is discharged from the outlet port 35 and the introduction port 88 to prevent the water from remaining.

(Modified example of the second embodiment)
FIG. 7B is a vertical sectional view of the liquid sterilizer 95. The difference between the liquid sterilizer 95 and the liquid sterilizer 80 is that the introduction port 83 is provided at a position opposite to the outlet port 14 in the circumferential direction of the housing portion 11.

In the liquid sterilizer 95, when the liquid sterilizer 95 is placed horizontally with the outlet portion 14 and the inlet portion 83 facing upward and downward, respectively, the inlet 88 of the inlet portion 83 is the bottom of the liquid sterilizer 95. It becomes a point. As a result, while the pump is stopped, the water 53 in the liquid sterilizer 10 is discharged from the introduction port 88 and is prevented from remaining in the housing portion 81.

(supplementary explanation)
In each of the illustrated embodiments, the outlet 35 is single. A plurality of outlets of the present invention may be provided on the peripheral portion of the outer tube at equal angular intervals in the circumferential direction or at arbitrary angular intervals.

Both the liquid sterilizers 80 and 95 have a single introduction port 88. In the present invention, a plurality of inlets may be provided at the peripheral portion of the outer pipe at equal angular intervals in the circumferential direction or at arbitrary angular intervals.

In the straightening vanes 42a and 42b, the size of the through holes (eyes) of the straightening vane 42a is larger than that of the straightening vanes 42b. Regarding the arrangement of the straightening vanes 42a and 42b in the flow direction of the water 53, in the embodiment, the straightening vanes 42a and the straightening vanes 42b are arranged on the upstream side and the downstream side, respectively, but they may be arranged in reverse.

The quartz plate 45 of the embodiment corresponds to a transmission plate capable of transmitting ultraviolet light in the present invention. The transmission plate of the present invention may be made of a material other than quartz.

The notch groove 50 on the end surface 43 of the small diameter portion 25 and the notch groove 50 on the other end surface of the small diameter portion 85 correspond to the first notch groove and the second notch groove of the present invention, respectively. The circuit board 57 of the light source unit 12 and the heat sink 58 of the light source unit 82 correspond to the first light source and the second light source of the present invention, respectively. The annular spaces 29 and 86 of the embodiment correspond to the first annular space and the second annular space of the present invention, respectively. The quartz plate 45 of the light source unit 12 and the quartz plate 45 of 92 correspond to the first transmission plate and the second transmission plate of the present invention, respectively.

In the embodiment, the annular spaces 29 and 86 are formed by forming the small diameter portions 25 and 85 on the inner pipe 21. The first annular space and the second annular space of the present invention may be formed by forming a large diameter portion on the inner peripheral side of the outer tube 22 instead of forming the small diameter portions 25 and 85 on the inner tube 21. can.

In the embodiment, water 53 has been described as the liquid to be treated. The liquid to be treated of the present invention may be a liquid other than water.

The liquid sterilizer of the present invention can also be applied to sterilize sewage in a sewage treatment plant. In that case, the diameter of the liquid sterilizer is significantly increased in order to quickly treat a large amount of sewage.

10,80,95 ... Liquid sterilizer, 21 ... Inner tube, 22 ... Outer tube, 25,85 ... Small diameter part, 26 ... Large diameter part, 27,71 ... Transition Part, 29 ... annular space (first annular space), 30 ... waterproof O-ring, 34,88 ... introduction port, 35 ... outlet port, 39 ... sterilization treatment space, 43, 44 ... end face, 45 ... quartz plate, 50 ... notch groove (first notch groove and second notch groove), 53 ... water (liquid to be treated), 55 ... screw Groove, 57 ... circuit board, 58 ... heat sink, 67 ... light source (first light source and second light source), 86 ... annular space (second annular space).

Claims (9)

An inner tube having a first notched groove that opens at one end and the other end in the axial direction and penetrates radially through the end face of the one end.
An outer pipe having a first annular space communicating with the first notch groove and accommodating the inner pipe between the inner pipe and the inner pipe on the one end side.
A first transmission plate capable of transmitting ultraviolet light and blocking the opening on the one end side of the outer tube, and a first transmission plate.
A first light source that irradiates ultraviolet light toward the opening on the one end side of the inner tube through the first transmission plate, and
An introduction port provided in the outer pipe and communicating with the inner pipe on the other end side,
An outlet provided on the side wall of the outer pipe and communicating with the first annular space,
A liquid sterilizer characterized by being equipped with. In the liquid sterilizer according to claim 1,
A liquid sterilizer, characterized in that an end surface of the inner tube on one end side is in surface contact with the surface of the first transmission plate. In the liquid sterilizer according to claim 1 or 2.
A liquid sterilizer characterized in that the end portion on the other end side of the first annular space is set at a position at least partially overlapping the outlet in the axial direction. In the liquid sterilizer according to claim 3,
Further, a liquid sterilizer comprising a water-stopping O-ring disposed between the inner tube and the outer tube on the other end side of the first annular space. In the liquid sterilizer according to any one of claims 1 to 4, the liquid sterilizer
The liquid sterilizer is characterized in that the introduction port is formed on the end wall on the other end side of the outer tube so that the central axis thereof is on the same straight line as the central axis of the inner tube. In the liquid sterilizer according to any one of claims 1 to 4, the liquid sterilizer
On the other end side, a second annular space communicating with the inner pipe is formed between the inner pipe and the outer pipe.
The liquid sterilizer, wherein the introduction port is provided on the side wall of the outer tube so as to communicate with the second annular space. In the liquid sterilizer according to claim 6,
The inner tube has a second notch groove that penetrates radially through the end face on the other end side.
Moreover,
A second transmission plate capable of transmitting ultraviolet light and closing the opening on the other end side of the inner tube and the outer tube, and a second transmission plate.
A second light source that irradiates ultraviolet light from the outside of the inner tube toward the opening on the other end side of the inner tube via the second transmission plate.
A liquid sterilizer characterized by being equipped with. In the liquid sterilizer according to any one of claims 1 to 6, the liquid sterilizer
Moreover,
The first transmission plate and the substrate on which the first light source is mounted are housed on the inner peripheral side, and are screwed to the outer peripheral portion of the outer tube on the one end side on the one end side to form the first transmission plate and the first transmission plate. A metal annular screw member that presses the substrate against the inner tube and the outer tube,
A heat sink that contacts the other end surface of the substrate while fitting the end portion on one end side to the inner circumference of the annular screw member.
A liquid sterilizer characterized by being equipped with. In the liquid sterilizer according to any one of claims 1 to 8, the liquid sterilizer
The outer tube is made of a metal material
The inner tube is a liquid sterilizer made of a resin material having a lower absorption rate of ultraviolet light than the metal material.

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