JP2021129686A - Fluid sterilizer - Google Patents

Abstract

To more appropriately monitor the light source of a fluid sterilizer.SOLUTION: A fluid sterilizer 10 comprises: a straight pipe 20 that defines a treatment flow path 12; a housing 30a that surrounds the outer periphery of the end of the straight pipe 20; a light source that emits ultraviolet light toward the treatment flow path 12; a transmission window 27 that is provided in a part of the straight pipe 20 and allows the ultraviolet light from the light source to be transmitted from the inside to the outside of the straight pipe 20; a first measuring instrument 61 that is arranged at a position where the ultraviolet light transmitted through the transmission window 27 can be incident when the circumferential rotation angle of the straight pipe 20 is a first angle; and a second measuring instrument 62 that is arranged at a position where the ultraviolet light transmitted through the transmission window 27 can be incident when the circumferential rotation angle of the straight pipe 20 is a second angle different from the first angle.SELECTED DRAWING: Figure 4

Description

The present invention relates to a technique for sterilizing a fluid by irradiating it with ultraviolet light.

A fluid sterilizer that sterilizes a fluid such as water by irradiating it with ultraviolet light in a treatment container is known. A photodiode capable of measuring the intensity of ultraviolet light is provided in the processing container, and the intensity of ultraviolet light applied to the fluid is monitored (see, for example, Patent Document 1).

JP-A-2019-37450

When the fluid sterilizer is used for a long period of time, both the light source and the measuring instrument deteriorate. When an abnormality occurs in the measurement, it may not be possible to distinguish between the abnormality of the light source and the measuring instrument.

The present invention has been made in view of these problems, and one of its exemplary objects is to provide a fluid sterilizer capable of more appropriately monitoring a light source.

The fluid sterilizer according to an embodiment of the present invention partitions a straight pipe for partitioning a treatment flow path, a flow port extending in a direction intersecting the longitudinal direction of the straight pipe, and a communication chamber connecting the flow port and the treatment flow path. , A housing that surrounds the outer circumference of the end of the straight tube, a light source window that is fixed to the housing and faces the end of the straight tube, and irradiates ultraviolet light toward the processing flow path through the light source window. A light source, a transmission window provided at a part of the straight tube that allows ultraviolet light from the light source to pass from the inside to the outside of the straight tube, and a longitudinal and radial displacement of the straight tube with respect to the housing are regulated. , A regulating member that enables the circumferential displacement of the straight tube with respect to the housing, and a position where ultraviolet light transmitted through the transmission window can be incident when the circumferential rotation angle of the straight tube is the first angle. The first measuring instrument to be arranged and the second measuring instrument arranged at a position where ultraviolet light transmitted through the transmission window can be incident when the rotation angle in the circumferential direction of the straight tube is a second angle different from the first angle. It is equipped with two measuring instruments.

According to this aspect, by rotating the straight tube, it is possible to switch between a mode in which the ultraviolet light is measured using the first measuring instrument and a mode in which the ultraviolet light is measured using the second measuring instrument. For example, when an abnormality is found in the measurement result of the first measuring instrument, it is possible to identify whether the light source or the first measuring instrument is the cause of the abnormality by switching to the second measuring instrument and measuring.

The first measuring instrument may be arranged at a position where ultraviolet light transmitted through the transmission window cannot be incident when the rotation angle in the circumferential direction of the straight tube is the second angle. The second measuring instrument may be arranged at a position where ultraviolet light transmitted through the transmission window cannot be incident when the rotation angle in the circumferential direction of the straight tube is the first angle.

The first measuring instrument and the second measuring instrument may be provided in the side wall of the housing exposed to the communication room. The transmission window may be provided at a position facing the side wall of the housing exposed to the communication room.

The second measuring instrument may be provided at a position separated from the first measuring instrument in the circumferential direction.

It may be further provided with an alignment mark provided on the outer peripheral surface of the straight pipe to indicate that the rotation angle of the straight pipe with respect to the housing is the first angle and the second angle, respectively.

According to the present invention, the light source of the fluid sterilizer can be monitored more appropriately.

It is a top view which shows schematic structure of the fluid sterilizer which concerns on embodiment. It is sectional drawing which shows typically the structure of the fluid sterilizer of FIG. It is sectional drawing which shows typically the structure of the fluid sterilizer of FIG. It is sectional drawing which shows typically the structure of the fluid sterilizer of FIG.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the description, the same elements are designated by the same reference numerals, and duplicate description will be omitted as appropriate.

FIG. 1 is a top view schematically showing the configuration of the fluid sterilizer 10 according to the embodiment. The fluid sterilizer 10 includes a straight pipe 20 and a first housing 30a and a second housing 30b provided at both ends of the straight pipe 20. The fluid sterilizer 10 is a device for sterilizing a fluid such as water flowing inside a straight pipe 20 by irradiating it with ultraviolet light. The fluid to be processed flows into the inside of the first housing 30a through the first distribution pipe 16a, and passes through the inside of the straight pipe 20 toward the second housing 30b as indicated by an arrow F. After that, it is discharged to the outside through the second distribution pipe 16b.

The straight pipe 20 has a cylindrical shape and extends from the first housing 30a to the second housing 30b. In the present specification, the longitudinal direction in which the straight pipe 20 extends may be referred to as "axial direction", and the direction orthogonal to the axial direction may be referred to as "diameter direction". Further, the direction around the central axis of the straight pipe 20 may be referred to as a "circumferential direction".

The straight pipe 20 is configured to be rotatable around the central axis of the straight pipe 20 with respect to the first housing 30a and the second housing 30b. The straight pipe 20 is attached to the first housing 30a by the first regulating member 50a, and is attached to the second housing 30b by the second regulating member 50b. The first regulating member 50a regulates the axial and radial displacement of the straight pipe 20 with respect to the first housing 30a, while allowing the straight pipe 20 to rotate in the circumferential direction with respect to the first housing 30a. Similarly, the second regulating member 50b regulates the axial and radial displacement of the straight pipe 20 with respect to the second housing 30b, while allowing the straight pipe 20 to rotate in the circumferential direction with respect to the second housing 30b. To.

Inside the fluid sterilizer 10, a first measuring instrument and a second measuring instrument (details will be described later) for monitoring the intensity of ultraviolet light are provided. The first measuring instrument and the second measuring instrument include a first measuring mode in which the intensity of ultraviolet light is measured using the first measuring instrument, and a second measuring mode in which the intensity of ultraviolet light is measured using the second measuring instrument. Is configured to be able to switch. Switching between the first measurement mode and the second measurement mode is realized by rotating the straight pipe 20 with respect to the first housing 30a and the second housing 30b. The straight pipe 20 can be rotated manually, for example.

A first alignment mark 28a and a second alignment mark 28b are provided on the outer peripheral surface 22 of the straight pipe 20. The first alignment mark 28a and the second alignment mark 28b are for indicating the position or rotation angle of the straight pipe 20 in the circumferential direction. The first regulating member 50a is provided with a reference mark 54 for aligning with any of the alignment marks 28a and 28b of the straight pipe 20. The first alignment mark 28a indicates a position where the rotation angle of the straight pipe 20 in the circumferential direction is the first angle, and the second alignment mark 28b indicates the rotation angle of the straight pipe 20 in the circumferential direction is the second angle. Indicates the position where When the positions of the first alignment mark 28a and the reference mark 54 are aligned, the first measurement mode is set in which the intensity of ultraviolet light is measured using the first measuring instrument. Further, when the positions of the second alignment mark 28b and the reference mark 54 are aligned, the second measurement mode is set in which the intensity of ultraviolet light is measured using the second measuring instrument.

FIG. 2 is a cross-sectional view schematically showing the configuration of the fluid sterilizer 10 of FIG. 1, and corresponds to the cross section taken along the line AA of FIG. FIG. 2 shows a state in which the positions of the first alignment mark 28a and the reference mark 54 are aligned.

The fluid sterilizer 10 has a configuration that is symmetrical in the axial direction of the straight pipe 20, and the internal configurations of the first housing 30a and the second housing 30b are symmetrical on the paper surface of FIG. .. Therefore, in the following description, the internal configuration of the first housing 30a will be mainly described in detail, and the description of the internal configuration of the second housing 30b will be omitted as appropriate. A member having a code ending in "a" in the drawing indicates a structure on the side of the first housing 30a drawn on the left side of the paper, and a member having a code ending in "b" is a member having a code ending in "b". It is shown that the structure is on the side of the second housing 30b drawn on the right side of.

The fluid sterilizer 10 includes a straight tube 20, a first housing 30a, a second housing 30b, a first light source 40a, a second light source 40b, a first light source window 43a, and a second light source window 43b. The first regulating member 50a, the second regulating member 50b, the first measuring instrument 61, and the control device 70 are provided. The fluid sterilizer 10 further includes a second measuring instrument 62 (not shown in FIG. 2, see FIGS. 3 and 4).

The straight pipe 20 is a cylindrical member that partitions the processing flow path 12. The straight pipe 20 has a first end 21a and a second end 21b. The first end 21a is provided with the first housing 30a, and the second end 21b is provided with the second housing 30b. The material of the straight tube 20 is not particularly limited, but it is preferable that at least the inner peripheral surface 23 of the straight tube 20 is a material having high durability and reflectance to ultraviolet light. The straight tube 20 can be made of, for example, a fluororesin such as polytetrafluoroethylene (PTFE). The thickness of the cylindrical wall of the straight pipe 20 is, for example, 3 mm or more.

The outer peripheral surface 22 of the straight pipe 20 is provided with a first outer peripheral groove portion 24a, a first outer peripheral recess 25a, a first outer peripheral engaging portion 26a, and a first alignment mark 28a.

The first outer peripheral groove portion 24a is provided at the attachment position of the first regulation member 50a and is continuously formed in the circumferential direction. A first regulating member 50a is inserted into the first outer peripheral groove portion 24a, and the axial and radial displacement of the straight pipe 20 is regulated by the first regulating member 50a. The first regulating member 50a can rotate with respect to the straight pipe 20 along the first outer peripheral groove portion 24a.

The first outer peripheral recess 25a is provided closer to the first end portion 21a than the first outer peripheral groove portion 24a. The first outer peripheral recess 25a is continuously formed in the circumferential direction, and an O-ring 46a for sealing between the first housing 30a and the straight pipe 20 and partitioning the first communication chamber 14a is arranged. NS.

The first outer peripheral engaging portion 26a is a stepped portion that is provided closer to the first end portion 21a than the first outer peripheral recess 25a and is continuously formed in the circumferential direction. The first outer peripheral engaging portion 26a engages with the first protrusion 36a of the first housing 30a to regulate the axial displacement of the straight pipe 20 with respect to the first housing 30a.

The transmission window 27 is provided at a part of the cylindrical wall of the straight pipe 20. The transmission window 27 is provided at a position closer to the first end portion 21a than the first outer peripheral engaging portion 26a, and is inside the first housing 30a with the first housing 30a and the first regulating member 50a attached. To position. The transmission window 27 is provided at a position facing the first side wall 39a that partitions the first communication opening 34a. The transmission window 27 is provided so as to penetrate the cylindrical wall of the straight tube 20, and allows ultraviolet light UV from the first light source 40a or the second light source 40b to be transmitted from the inside to the outside of the straight tube 20, and the first measuring instrument 61. To be able to enter into. The transmission window 27 is formed only at a specific position in the circumferential direction, as shown in FIG. 3 described later.

The transmission window 27 is made of a material having a high transmittance of ultraviolet light, and is made of a glass material such as quartz or an amorphous fluororesin material. The transmission window 27 may be made of the same material as the straight pipe 20 at least in part. The transmission window 27 may be formed by partially reducing the thickness of the cylindrical wall of the straight pipe 20. By reducing the thickness of PTFE, which is the material of the straight tube 20, to 2 mm or less or 1 mm or less, it can function as a window for transmitting ultraviolet light. The transmission window 27 may be configured by a structure in which a PTFE layer having a thickness of 2 mm or less or 1 mm or less and a quartz layer or an amorphous fluororesin layer are laminated in the radial direction.

The first alignment mark 28a is provided at a position farther from the first end portion 21a than the first outer peripheral groove portion 24a, and is outside the fluid sterilizer 10 in a state where the first housing 30a and the first regulation member 50a are attached. Exposed to. The first alignment mark 28a is formed only at a specific position in the circumferential direction, and is provided, for example, on the side opposite to the position in the circumferential direction where the transmission window 27 is provided (that is, a position different by 180 degrees).

The first housing 30a is provided so as to surround the outer circumference of the first end portion 21a of the straight pipe 20. The first housing 30a includes a first main body portion 31a and a first light source accommodating portion 32a. The first main body 31a includes a first distribution port 33a, a first communication opening 34a, a first straight pipe support opening 35a, a first protrusion 36a, a first window support opening 37a, and a first recess 38a. Has.

The material of the first housing 30a is not particularly limited, but it is preferably a material having high durability against ultraviolet light. The first main body 31a is preferably made of a material having a lower reflectance of ultraviolet light than the straight tube 20, and can be made of a fluororesin such as polyvinylidene fluoride (PVDF). By using PVDF, which has a lower ultraviolet light reflectance than PTFE, as the material of the first housing 30a, ultraviolet light is reflected on the inner surface of the first communication chamber 14a, and the first housing 30a is passed through the first distribution port 33a. It is possible to reduce the intensity of ultraviolet light toward the outside of the.

The first distribution port 33a is an opening extending in a direction intersecting the longitudinal direction of the straight pipe 20 (for example, in the radial direction), and serves as an insertion port for the first distribution pipe 16a. The first communication opening 34a is provided in the center of the first main body 31a, and partitions the first communication chamber 14a that connects the first distribution port 33a and the processing flow path 12. The radial opening width of the first communication opening 34a is larger than the outer diameter of the straight pipe 20. The first communication opening 34a is formed so as to face the outer peripheral surface 22 of the straight pipe 20, and is formed so as to be continuous in the circumferential direction on the radial outer side of the outer peripheral surface 22 of the straight pipe 20.

The first straight pipe support opening 35a is a circular opening extending in the axial direction. The first straight pipe support opening 35a contacts the O-ring 46a provided in the first outer peripheral recess 25a of the straight pipe 20 to support the outer peripheral surface 22 of the straight pipe 20 and regulates the radial displacement of the straight pipe 20. .. The radial opening width of the first straight pipe support opening 35a is about the same as the outer diameter of the straight pipe 20. The first protrusion 36a is provided at a position between the first communication opening 34a and the first straight pipe support opening 35a, and is formed so as to be continuous in the circumferential direction. The first protrusion 36a engages with the first outer peripheral engaging portion 26a of the straight pipe 20 to regulate the axial and radial displacement of the straight pipe 20.

The first window support opening 37a is a circular opening extending in the axial direction. The first window support opening 37a is provided on the side opposite to the first straight tube support opening 35a with the first communication opening 34a interposed therebetween, and supports the first light source window 43a. The radial opening width of the first window support opening 37a is about the same as the outer diameter of the first light source window 43a. A first recess 38a is provided on the surface of the first light source window 43a inside the first window support opening 37a facing the light emitting surface 45a. An O-ring 48a for partitioning the first communication chamber 14a by sealing between the first main body 31a and the first light source window 43a is arranged in the first recess 38a.

The first main body 31a is provided with a first measuring port 65 for arranging the first measuring instrument 61. The first measurement port 65 is provided on the first side wall 39a of the first main body 31a that partitions the first communication opening 34a. The first measurement port 65 is closed by the first measurement window 63. The first measurement window 63 is exposed to the first communication chamber 14a and constitutes a part of the inner surface of the first side wall 39a that partitions the first communication opening 34a. The first measurement window 63 allows ultraviolet light transmitted through the transmission window 27 to enter the first measuring instrument 61. The first measurement window 63 is made of a material having a high transmittance of ultraviolet light, and is made of a glass material such as quartz or an amorphous fluororesin material. The first measurement window 63 may be made of the same material as the first housing 30a, and may be made of, for example, a PVDF layer having a thickness of 2 mm or less or 1 mm or less.

The first light source accommodating portion 32a is provided at a position axially away from the straight pipe 20 with respect to the first main body portion 31a. The first light source accommodating portion 32a partitions the first light source chamber 18a in which the first light source 40a is accommodated, and fixes the first light source window 43a by sandwiching it between the first main body portion 31a and the first light source accommodating portion 32a. do. The first light source accommodating portion 32a is fixed to the first main body portion 31a by, for example, a fastening member (not shown) such as a screw or a bolt.

The second housing 30b is provided so as to surround the outer circumference of the second end portion 21b of the straight pipe 20. The second housing 30b includes a second main body portion 31b and a second light source accommodating portion 32b. The second main body 31b is configured in the same manner as the first main body 31a described above, and the second light source accommodating portion 32b is configured in the same manner as the first light source accommodating portion 32a described above.

The first light source 40a is housed in the first light source chamber 18a, and is configured to irradiate ultraviolet light UV in the axial direction toward the processing flow path 12 through the first light source window 43a. The first light source 40a has a plurality of light emitting elements 41a and a first substrate 42a. The light emitting element 41a is a so-called UV-LED (Ultra Violet-Light Emitting Diode), which emits ultraviolet light having a peak wavelength of light emission of 300 nm or less and a wavelength of high sterilization efficiency of 260 nm to 290 nm. The plurality of light emitting elements 41a are arranged in an array on the mounting surface of the first substrate 42a. The first light source 40a may have a lens or a reflector (not shown) for adjusting the light distribution of ultraviolet light output from each light emitting element 41a. The lens and the reflector may be arranged between each light emitting element 41a and the first light source window 43a, or may be integrated with the first light source window 43a.

The first light source window 43a is arranged between the first end 21a of the straight pipe 20 and the first light source 40a, and partitions between the first communication chamber 14a and the first light source chamber 18a. The first light source window 43a has a light incident surface 44a on which ultraviolet light from the first light source 40a is incident, and a light emitting surface 45a on the opposite side of the light incident surface 44a. The first light source window 43a is made of a material having a high transmittance of ultraviolet light, and is made of, for example, quartz glass (SiO ₂ ) or sapphire (Al ₂ O ₃ ).

The second light source 40b is housed in a second light source chamber 18b partitioned inside the second housing 30b, and is configured to axially irradiate ultraviolet light toward the processing flow path through the second light source window 43b. NS. The second light source 40b is configured in the same manner as the first light source 40a described above.

The first regulating member 50a has a circular opening that is inserted into the first outer peripheral groove portion 24a of the straight pipe 20, and is fixed to the first housing 30a in a state of being engaged with the first outer peripheral groove portion 24a. The first regulating member 50a is divided into two upper and lower members 51a and 52a. In the first regulating member 50a, the first upper regulating member 51a is attached from the upper side of the straight pipe 20, the first lower regulating member 52a is attached from the lower side of the straight pipe 20, and then the first upper regulating member 51a and the first lower. The side regulating member 52a is integrated by fixing it to the first housing 30a. The first regulation member 50a is fixed to the first housing 30a by a fastening member such as a screw or a bolt.

The second regulating member 50b is inserted into the second outer peripheral groove portion 24b of the straight pipe 20, and is fixed to the second housing 30b in a state of being engaged with the second outer peripheral groove portion 24b. The second regulating member 50b is configured in the same manner as the first regulating member 50a.

The first measuring instrument 61 is provided in the first measuring port 65 and measures the intensity of ultraviolet light transmitted through the transmission window 27 and the first measuring window 63. The first measuring instrument 61 is provided for monitoring ultraviolet light UV from the first light source 40a or the second light source 40b. The first measuring instrument 61 includes a photodiode capable of detecting ultraviolet light. The measurement result of the first measuring device 61 is sent to the control device 70.

The control device 70 controls the operations of the first light source 40a and the second light source 40b. The control device 70 is based on the measurement results of the first measuring device 61 and the second measuring device 62, and the first light source is such that the intensity of the ultraviolet light UV output from the first light source 40a and the second light source 40b is constant. Drives 40a and a second light source 40b. The control device 70 is configured to output an alert when an abnormality is found in the measurement result of the first measuring device 61.

The control device 70 can be realized by an element such as a CPU and a memory of a computer or a mechanical device in terms of hardware, and is realized by a computer program or the like in terms of software. Those skilled in the art will understand that various functions of the control device 70 can be realized in various forms by combining hardware and software.

In the configuration shown in FIG. 2, the fluids to be sterilized are the first communication pipe 16a, the first communication port 33a, the first communication chamber 14a, the processing flow path 12, the second communication chamber 14b, and the second distribution port. 33b Passes through the second communication pipe 16b in this order. The first light source 40a and the second light source 40b irradiate the fluid flowing in the processing flow path 12 as indicated by an arrow F with ultraviolet light UV in the axial direction. As a result, the fluid is sterilized in the treatment flow path 12. A part of the ultraviolet light UV output from the first light source 40a and the second light source 40b passes through the transmission window 27 and the first measurement window 63 and enters the first measuring instrument 61. The first measuring instrument 61 measures the intensity of the ultraviolet light UV and monitors the change in the intensity of the ultraviolet light UV output from the first light source 40a and the second light source 40b.

FIG. 3 is a cross-sectional view schematically showing the configuration of the fluid sterilizer 10 of FIG. 1, and corresponds to the cross section taken along the line BB of FIG. FIG. 3 shows a case where the rotation angle of the straight pipe 20 with respect to the first housing 30a in the circumferential direction is the first angle, and the positions of the transmission window 27 and the first measurement window 63 in the circumferential direction coincide with each other. The first measurement mode in which the ultraviolet light can be measured by the measuring instrument 61 is shown.

The first main body 31a is provided with a second measuring port 66 for arranging the second measuring instrument 62. The second measurement port 66 is provided on the first side wall 39a of the first main body 31a that partitions the first communication opening 34a. The second measurement port 66 is provided at a position separated from the first measurement port 65 in the circumferential direction, and is provided at a position deviated by an angle of Δφ in the circumferential direction with respect to the central axis C of the straight pipe 20. The angle difference Δφ between the first measurement port 65 and the second measurement port 66 corresponds to the above-mentioned angle difference between the first angle and the second angle. The magnitude of the angle difference Δφ is set to be larger than the width w in the circumferential direction of the transmission window 27. The magnitude of the angle difference Δφ is not particularly limited, but can be arbitrarily set in the range of, for example, 10 ° to 90 °.

The second measurement port 66 is closed by the second measurement window 64. The second measurement window 64 is exposed to the first communication chamber 14a and constitutes a part of the inner surface of the first side wall 39a that partitions the first communication opening 34a. The second measurement window 64 is provided at a position separated from the first measurement window 63 in the circumferential direction, and is provided at a position deviated by an angle of Δφ in the circumferential direction with respect to the central axis C of the straight pipe 20. The second measurement window 64 is made of a material having a high transmittance of ultraviolet light, and is made of a glass material such as quartz or an amorphous fluororesin material. The second measurement window 64 may be made of the same material as the first housing 30a, and may be made of, for example, a PVDF layer having a thickness of 2 mm or less or 1 mm or less.

The second measuring instrument 62 is provided in the second measuring port 66 and measures the intensity of the ultraviolet light transmitted through the transmission window 27 and the second measuring window 64. The second measuring instrument 62 is provided at a position separated from the first measuring instrument 61 in the circumferential direction. The axial position of the second measuring instrument 62 coincides with the axial position of the first measuring instrument 61. The second measuring instrument 62 is provided to monitor the ultraviolet light UV from the first light source 40a or the second light source 40b. The second measuring instrument 62 includes a photodiode capable of detecting ultraviolet light. The measurement result of the second measuring device 62 is sent to the control device 70. In the first measurement mode shown in FIG. 3, since the positions of the transmission window 27 and the second measurement window 64 in the circumferential direction are deviated from each other, the ultraviolet light transmitted through the transmission window 27 is incident on the second measuring instrument 62. It becomes impossible. In other words, the ultraviolet light directed to the second measuring instrument 62 is shielded by the cylindrical wall of the straight tube 20.

FIG. 4 is a cross-sectional view schematically showing the configuration of the fluid sterilizer 10 of FIG. FIG. 4 shows a case where the straight pipe 20 shown in FIG. 3 is rotated as shown by an arrow R, and the rotation angle of the straight pipe 20 with respect to the first housing 30a in the circumferential direction is set to the second angle. In the state of FIG. 4, the position of the transmission window 27 and the second measurement window 64 in the circumferential direction coincide with each other, and the second measurement mode enables the measurement of ultraviolet light by the second measuring instrument 62. In the second measurement mode, since the positions of the transmission window 27 and the first measurement window 63 in the circumferential direction are deviated from each other, the ultraviolet light transmitted through the transmission window 27 cannot enter the first measuring instrument 61. In other words, the ultraviolet light directed to the first measuring instrument 61 is shielded by the cylindrical wall of the straight tube 20.

Next, how to use the first measuring instrument 61 and the second measuring instrument 62 will be described. The first measuring instrument 61 can be used to measure the intensity of ultraviolet light UV at normal times, and the second measuring instrument 62 can be used to measure the intensity of ultraviolet light UV at abnormal times. In the normal state, the rotation angle of the straight pipe 20 in the circumferential direction is set to the first angle, and the positions of the reference mark 54 and the first alignment mark 28a shown in FIG. 1 coincide with each other. As a result, the first measurement mode shown in FIG. 3 is set, and the ultraviolet light transmitted through the transmission window 27 can be incident on the first measuring instrument 61, while the ultraviolet light transmitted through the transmission window 27 can be incident on the second measuring instrument 62. It becomes impossible to enter. The control device 70 controls the operations of the first light source 40a and the second light source 40b based on the measurement result of the first measuring device 61. The control device 70 may store log information such as the drive time of the first light source 40a and the second light source 40b, the time lapse of the drive current, and the time lapse of the measured value of the first measuring device 61.

The control device 70 outputs an alert when an abnormality is detected in the measurement result of the first measuring device 61. The control device 70 is, for example, when the measured value of the first measuring instrument 61 is equal to or less than a predetermined reference value, or when the amount of change of the measured value of the first measuring instrument 61 per unit time exceeds a predetermined threshold value. Output an alert to. The predetermined reference value can be set to, for example, about 0.5 to 0.8 times the initial value at the start of operation of the fluid sterilizer 10. The predetermined threshold value can be set to, for example, about 0.2 times to 0.5 times the measured value of the first measuring instrument 61.

When an alert is output from the control device 70, the user rotates the straight pipe 20 so that the positions of the reference mark 54 and the second alignment mark 28b shown in FIG. 1 coincide with each other, and the straight pipe 20 is rotated in the circumferential direction of the straight pipe 20. The rotation angle is set to the second angle. As a result, the second measurement mode shown in FIG. 4 is set, and the ultraviolet light transmitted through the transmission window 27 cannot enter the first measuring instrument 61, while the ultraviolet light transmitted through the transmission window 27 cannot enter the second measuring instrument 62. It becomes possible to enter. The control device 70 detects whether or not there is an abnormality in the measurement result of the second measuring device 62. When an abnormality is detected in the measurement result of the second measuring device 62, the control device 70 notifies the user that there is an abnormality in the operation of the first light source 40a and the second light source 40b. When the control device 70 does not detect an abnormality in the measurement result of the second measuring instrument 62, the control device 70 notifies the user that there is an abnormality in the first measuring instrument 61. When the control device 70 has an abnormality only in the first measuring device 61, the control device 70 may control the operation of the first light source 40a and the second light source 40b based on the measurement result of the second measuring device 62. As a result, the operation of the fluid sterilizer 10 can be continued for a temporary period until the operation of the fluid sterilizer 10 can be stopped and the first measuring instrument 61 can be replaced without stopping the operation of the fluid sterilizer 10.

The control device 70 may calibrate the measured value of the first measuring instrument 61 based on the measured value of the second measuring instrument 62. Since the first measuring instrument 61 continuously measures the ultraviolet light UV during the operation of the fluid sterilizer 10, it deteriorates with time due to the irradiation of the ultraviolet light. Therefore, even when the amount of ultraviolet light incident on the first measuring instrument 61 does not change, the measured value changes with time due to the deterioration of the first measuring instrument 61. Therefore, the intensity of the ultraviolet light UV may be periodically measured by the second measuring instrument 62, and the measured value of the first measuring instrument 61 may be calibrated with reference to the measured value of the second measuring instrument 62. By using the second measuring instrument 62 only at the time of abnormality or calibration, deterioration of the second measuring instrument 62 due to ultraviolet light can be prevented, and the calibration accuracy of the first measuring instrument 61 can be improved.

According to the present embodiment, since the first measuring instrument 61 and the second measuring instrument 62 are provided outside the straight pipe 20 instead of inside the straight pipe 20, the processing flow path 12 partitioned by the straight pipe 20 The ultraviolet light from the first light source 40a or the second light source 40b can be measured without significantly affecting the flow.

The present invention has been described above based on examples. It is understood by those skilled in the art that the present invention is not limited to the above-described embodiment, various design changes are possible, various modifications are possible, and such modifications are also within the scope of the present invention. It is about to be.

In the above-described embodiment, the case where the straight pipe 20 is manually rotated has been shown. In another embodiment, a rotating device configured to give a driving force to rotate the straight pipe 20 to the housing may be provided. This rotating device may be configured to transmit a rotational force to the outer peripheral surface 22 of the straight pipe 20. For example, a concavo-convex structure serving as a gear may be formed on a part of the outer peripheral surface 22 of the straight pipe 20, and the rotating device may be configured to rotate the drive gear that meshes with the gear on the outer peripheral surface 22. When an abnormality is detected in the measurement result of the first measuring device 61, the control device 70 may drive the rotating device to switch from the first measurement mode to the second measurement mode. The control device 70 may periodically switch from the first measurement mode to the second measurement mode to calibrate the measured value of the first measuring device 61.

In the above-described embodiment, the transmission window 27, the first measuring instrument 61, and the second measuring instrument 62 are provided inside the first housing 30a. In another embodiment, the same configuration as the transmission window 27, the first measuring instrument 61, and the second measuring instrument 62 may be provided inside the second housing 30b.

In the above-described embodiment, the first housing 30a and the second housing 30b are provided at the first end 21a and the second end 21b of the straight pipe 20, respectively. In another embodiment, the second end portion 21b may not be provided with the second housing 30b, or the second light source 40b may not be provided.

10 ... fluid sterilizer, 12 ... processing flow path, 20 ... straight pipe, 22 ... outer peripheral surface, 27 ... transmission window, 30a ... first housing, 30b ... second housing, 40a ... first light source, 40b ... first 2 light sources, 50a ... 1st regulating member, 50b ... 2nd regulating member, 61 ... 1st measuring instrument, 62 ... 2nd measuring instrument, 63 ... 1st measuring window, 64 ... 2nd measuring window.

Claims (5)

A straight pipe that partitions the processing flow path and
A housing that separates a distribution port extending in a direction intersecting the longitudinal direction of the straight pipe and a communication chamber connecting the distribution port and the processing flow path and surrounds the outer periphery of the end portion of the straight pipe.
A light source window fixed to the housing and facing the end of the straight tube,
A light source that irradiates ultraviolet light toward the processing flow path through the light source window,
A transmission window provided at a part of the straight tube and transmitting ultraviolet light from the light source from the inside to the outside of the straight tube.
A regulating member that regulates the longitudinal and radial displacement of the straight pipe with respect to the housing and enables the circumferential displacement of the straight pipe with respect to the housing.
A first measuring instrument arranged at a position where ultraviolet light transmitted through the transmission window can be incident when the rotation angle of the straight tube in the circumferential direction is the first angle.
A second measuring instrument arranged at a position where ultraviolet light transmitted through the transmission window can be incident when the rotation angle of the straight tube in the circumferential direction is a second angle different from the first angle. A fluid sterilizer characterized by being provided. The first measuring instrument is arranged at a position where ultraviolet light transmitted through the transmission window cannot be incident when the rotation angle of the straight tube in the circumferential direction is the second angle.
The second measuring instrument is claimed to be arranged at a position where ultraviolet light transmitted through the transmission window cannot be incident when the rotation angle of the straight tube in the circumferential direction is the first angle. Item 1. The fluid sterilizer according to item 1. The first measuring instrument and the second measuring instrument are provided in the side wall of the housing exposed to the communication chamber.
The fluid sterilizer according to claim 1 or 2, wherein the transmission window is provided at a position facing the side wall of the housing exposed to the communication chamber. The fluid sterilizer according to any one of claims 1 to 3, wherein the second measuring instrument is provided at a position separated from the first measuring instrument in the circumferential direction. A claim provided on the outer peripheral surface of the straight pipe, further comprising an alignment mark indicating that the rotation angle of the straight pipe with respect to the housing is each of the first angle and the second angle. The fluid sterilizer according to any one of items 1 to 4.

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