JP2013205375A - Water quality measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve measurement accuracy of water quality in a water quality measuring apparatus including a structure for transmitting inside driving force to an outside cleaning mechanism by utilizing attraction force of magnetic force.SOLUTION: The water quality measuring apparatus includes: a light projection window 34 formed on a light projection surface part 31 on which water to be measured is brought into contact with the outside; a light source arranged on a position corresponding to the light projection window 34 on the inside of the light projection surface part 31; a light receiving window 35 formed on a light receiving surface part 32 on which water to be measured is brought into contact with the outside and opposed to the light projection window 34; a sensor arranged on a position corresponding to the light receiving window 35 on the inside of the light receiving surface part 32; an annular structure 70 which is an annular member rotatably supported on the inside of the light projection surface part 31 and formed so as to surround a light projection route from the light source to the light projection window 34, and is allowed to rotate by transmission of driving force; and a light projection window wiper 41 rotatably supported on the outside of the light receiving surface part 31 and applying suction force caused by magnetic force between the wiper and the annular structure 70.

Description

  The present invention relates to an immersion type water quality measuring device used in water for measuring water quality.

  The quality of the raw water subject to water treatment and wastewater treatment, such as river water, lake water, and industrial water, may vary greatly depending on the weather. Such fluctuations in the quality of raw water greatly affect the quality of treated water after irrigation and wastewater treatment. Therefore, quality management of raw water is important for appropriate water treatment in irrigation and wastewater treatment.

  As a water quality measurement method used in the quality control of raw water, a method of measuring the absorbance of the raw water is generally used. Specifically, for example, by measuring the absorbance of ultraviolet light, it is possible to perform measurement of organic substances in raw water, measurement of nitrate ion concentration, chromaticity analysis, and the like. Further, for example, by measuring the absorbance of visible light, the suspension concentration of raw water can be measured.

  As a water quality measuring device for measuring the absorbance of raw water, an immersion type water quality measuring device used in a state of being immersed in raw water for measuring water quality is known. In such a water quality measuring device, there is a possibility that the measurement accuracy is lowered and proper water quality measurement cannot be performed when some foreign matter contained in the raw water adheres to the surface of the detection unit. For this reason, the immersion type water quality measuring apparatus is generally provided with a cleaning mechanism for removing foreign matter adhering to the surface of the detection unit with a brush or a wiper.

  However, the water quality measuring apparatus provided with such a cleaning mechanism needs to operate the cleaning mechanism provided outside the water quality measuring apparatus by the driving force of the motor provided inside the water quality measuring apparatus. In this case, for example, if a driving force transmission mechanism that transmits the driving force of the motor to the cleaning mechanism is provided by a rotating shaft that penetrates from the inside to the outside of the water quality measuring device, the water quality measuring device is provided inside the water quality measuring device via the driving force transmission mechanism. A waterproof structure must be provided to prevent the raw water from entering. If the waterproof property of the waterproof structure is reduced due to erosion or aging deterioration due to raw water, the raw water may enter the inside of the water quality measuring device and cause a failure or the like. Further, when used under high water pressure, a large waterproof structure that can ensure waterproofness under the high water pressure is required, which may lead to a significant increase in cost.

  As a prior art aiming at solving such a problem, a water quality measuring device employing a driving force transmission structure using an attractive force by a magnetic force of a magnet is known. For example, a water quality measuring apparatus having a structure in which a brush for wiping off foreign matters adhering to the surface of a probe and an internal motor are connected by a magnetic coupling is known (see, for example, Patent Document 1). Also known is a water quality measuring device that projects light from the light emitting section through the transparent window into the raw water and receives the light transmitted through the raw water at the light receiving section through the transparent window facing the transparent window of the light emitting section. is there. In such a water quality measurement apparatus, a water quality measurement apparatus having a mechanism for reciprocating a wiper provided on the raw water side by reciprocating a magnet inside the apparatus is known (see, for example, Patent Document 2). .

JP 2006-194659 A Utility Model Registration No. 3114112

  However, the prior art disclosed in, for example, the above-mentioned Patent Document 1 is a water quality measuring device having a structure in which light is projected from the light emitting unit into the raw water and the light transmitted through the raw water is received by the opposing light receiving unit. It is difficult to adopt. Further, in the water quality measuring device disclosed in Patent Document 2, the magnet reciprocates so as to cross the light projecting path from the light source to the transparent window and the light receiving path from the transparent window to the sensor. Therefore, the water quality measuring device disclosed in the above-mentioned Patent Document 2 needs to provide a certain distance or more between the transparent window and the light source and between the transparent window and the sensor. The efficiency and the light receiving efficiency of the light receiving unit are lowered, and there is a possibility that the measurement accuracy of water quality is lowered.

  In view of such circumstances, the present invention has been made, and an object of the present invention is to measure water quality in a water quality measuring device having a structure that transmits an internal driving force to an external cleaning mechanism by using a magnetic attraction force. It is to improve accuracy.

<First Aspect of the Present Invention>
According to a first aspect of the present invention, there is a light projecting surface portion in which water to be measured contacts the outside, a light projecting window provided on the light projecting surface portion with a translucent member, and the light projecting inside the light projecting surface portion A light projecting portion including a light source provided at a position corresponding to the window, a light receiving surface portion provided opposite to the light projecting surface portion and in contact with water to be measured, and a light-transmitting member on the light receiving surface portion. A light receiving window provided to face the light projecting window, a light receiving part including a sensor provided at a position corresponding to the light receiving window inside the light receiving surface part, and rotatably supported inside the light projecting surface part, A ring-shaped member provided so as to surround a light-projecting path from the light source to the light-projecting window, and a light-projecting-unit annular member that rotates by transmission of a driving force, and is rotatable to the outside of the light projecting surface unit A light projection window that is supported and attracted by a magnetic force to the light projecting portion annular member. And par, a water quality measuring device comprising a.

  An attractive force due to magnetic force acts between a light projecting portion annular member rotatably supported inside the light projecting surface portion and a light projection window wiper rotatably supported outside the light projecting surface portion. The action of the attractive force by the magnetic force can be realized by providing a magnet on one of the light projecting portion annular member and the light projection window wiper and providing a magnet or a ferromagnetic material such as iron on the other. Therefore, when the driving force is transmitted and the light projecting portion annular member rotates, the light projecting window wiper provided on the outer side of the light projecting surface portion is rotationally driven to act on the light projecting portion annular member by the action of the attraction force by the magnetic force. Power is transmitted to rotate. As a result, foreign matter or the like attached to the projection window outside the projection surface is wiped away by the projection window wiper and removed.

  The light projecting portion annular member is an annular member provided so as to surround the light projecting path from the light source to the light projecting window. Therefore, the rotating light projecting portion annular member does not cross the light projecting path from the light source to the light projecting window. Therefore, it is not necessary to provide a certain distance between the light source and the projection window. For example, it is possible to provide a light source at a position close to the projection window, and the distance between the light source and the projection window can be reduced. It can be greatly reduced. As a result, the light projecting efficiency of the light projecting unit can be increased, so that the measurement accuracy of water quality can be improved.

  Thus, according to the first aspect of the present invention, in the water quality measuring device having a structure for transmitting the inner driving force to the outer cleaning mechanism using the attractive force due to the magnetic force, the water quality measurement accuracy can be improved. The effect that it can be obtained.

<Second Aspect of the Present Invention>
According to a second aspect of the present invention, there is provided a light projecting surface portion in which water to be measured is in contact with the outside, a light projecting window provided on the light projecting surface portion with a translucent member, and the light projecting inside the light projecting surface portion. A light projecting portion including a light source provided at a position corresponding to the window, a light receiving surface portion provided opposite to the light projecting surface portion and in contact with water to be measured, and a light-transmitting member on the light receiving surface portion. A light receiving window provided opposite to the light projecting window, a light receiving portion including a sensor provided at a position corresponding to the light receiving window inside the light receiving surface portion, and rotatably supported inside the light receiving surface portion, A ring-shaped member provided so as to surround a light-receiving path from the light-receiving window to the sensor; and a light-receiving unit ring-shaped member that is rotated by transmission of a driving force; and is rotatably supported outside the light-receiving surface unit; Receiving window in which a magnetic attractive force acts between the annular member And Ipa, a water quality measuring device comprising a.

  An attractive force due to magnetic force acts between the light receiving portion annular member rotatably supported inside the light receiving surface portion and the light receiving window wiper rotatably supported outside the light receiving surface portion. The action of the attractive force by the magnetic force can be realized by providing a magnet on one of the light receiving portion annular member or the light receiving window wiper and providing a magnet or a ferromagnetic material such as iron on the other. Therefore, when the driving force is transmitted and the light receiving portion annular member rotates, the light receiving window wiper provided outside the light receiving surface portion receives the rotational driving force acting on the light receiving portion annular member by the action of the attraction force by the magnetic force. Rotate. As a result, foreign matter or the like adhering to the light receiving window outside the light receiving surface is wiped away by the light receiving window wiper.

  The light receiving portion annular member is an annular member provided so as to surround the light receiving path from the light receiving window to the sensor. Therefore, the rotating light receiving portion annular member does not cross the light receiving path from the light receiving window to the sensor. Therefore, it is not necessary to provide a certain distance between the sensor and the light receiving window. For example, it is possible to provide a sensor near the light receiving window, and the distance between the sensor and the light receiving window is significantly reduced. can do. As a result, the light receiving efficiency of the light receiving unit can be increased, so that the water quality measurement accuracy can be improved.

<Third Aspect of the Present Invention>
According to a third aspect of the present invention, in the first aspect of the present invention described above, an annular ring that is rotatably supported inside the light receiving surface portion and that surrounds the light receiving path from the light receiving window to the sensor. And a light receiving window wiper which is rotatably supported on the outer side of the light receiving surface portion and receives a magnetic attraction force between the light receiving portion annular member. And a water quality measuring device characterized by comprising:
According to the third aspect of the present invention, in addition to the operational effects obtained in the first aspect of the present invention, the operational effects obtained in the second aspect of the present invention described above can be obtained.

<Fourth aspect of the present invention>
According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention described above, the control unit measures the water quality from the light reception level only when the light reception level of the sensor is equal to or greater than a certain threshold value. The water quality measuring device further comprising:

  When the projection window wiper is rotating, the projection window wiper wipes the projection window when the projection window wiper passes through the portion of the projection surface where the projection window is provided. Sometimes, the light projecting path from the light projecting window to the light receiving window is blocked by the light projecting window wiper. Similarly, when the light receiving window wiper passes the portion where the light receiving window of the light receiving surface portion is provided in the rotating light receiving window wiper, that is, when the rotating light receiving window wiper wipes the light receiving window. The light projecting path from the light window to the light receiving window is blocked by the light receiving window wiper. In such a state, it is impossible to accurately measure the water quality between the light projecting surface portion and the light receiving surface portion.

  However, in such a state, the light reception level of the sensor is greatly reduced. Therefore, it is possible to specify whether or not the light projecting path from the light projecting window to the light receiving window is blocked by the light projecting window wiper or the light receiving window wiper depending on whether or not the light receiving level is a certain threshold value or more. it can. In other words, by measuring the water quality from the light reception level only when the light reception level of the sensor is above a certain threshold, the water quality can be accurately measured without being affected by the rotating projection window wiper or the light reception window wiper. it can. Accordingly, for example, even when the light projection window wiper or the light reception window wiper is always rotated, the rotation of the light projection window wiper or the light reception window wiper is not detected, and the light projection window wiper or the light reception window wiper is rotated. It is possible to accurately measure the water quality by preventing the erroneous measurement caused by it.

  ADVANTAGE OF THE INVENTION According to this invention, in the water quality measuring apparatus provided with the structure which transmits the inner driving force to an outer washing | cleaning mechanism using the attractive force by magnetic force, the measurement precision of water quality can be improved.

The front view which illustrated the external appearance of the water quality measuring device concerning the present invention. The front view which illustrated the section of the important section of the water quality measuring device concerning the present invention. The perspective view which illustrated the section of the important section of the water quality measuring device concerning the present invention. The perspective view which illustrated the section of the important section of the water quality measuring device concerning the present invention. The disassembled perspective view which illustrated the support structure of the cyclic structure. The disassembled perspective view which illustrated the structure of the cyclic structure. The disassembled perspective view which illustrated the structure of the cyclic structure. The perspective view of a wiper unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Overall configuration of water quality measuring device>
The overall configuration of the water quality measuring apparatus according to the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a front view illustrating the appearance of a water quality measuring apparatus according to the present invention. FIG. 2 is a front view illustrating a cross section of a main part of the water quality measuring apparatus according to the present invention.

  The water quality measuring apparatus according to the present invention includes a light source case 10, a sensor case 20, an optical path cell 30, a wiper unit 40, and a cable connector 50.

  The light source case 10 is a bottomed cylindrical metal member, and the opening is connected to the optical path cell 30. The connection structure between the light source case 10 and the optical path cell 30 is a watertight structure by the O-ring 11. A light source unit 12 and a light source mounting base 13 are provided inside the light source case 10. The light source unit 12 is a unit including a light source and a light source optical system. The light source mount 13 is a member that positions and supports the light source unit 12 so that the light source of the light source unit 12 is disposed at a position corresponding to the light projection window 34 inside the light projecting surface portion 31.

  The sensor case 20 is a cylindrical metal member, one end of which is connected to the optical path cell 30, and a cable connector 50 that connects the external device and the water quality measuring device via a cable is attached to the other end. The connection structure between the sensor case 20 and the optical path cell 30 is a watertight structure by the O-ring 21. The connection structure between the sensor case 20 and the cable connector 50 is a watertight structure by the O-ring 22. Inside the sensor case 20, a sensor mounting base 23, a support column 24, and a substrate support plate 25 are provided. The sensor mounting base 23 is a member that positions and supports the sensor unit so that the sensor of the sensor unit (not shown) is disposed at a position corresponding to the light receiving window 35 inside the light receiving surface portion 32. The support 24 is a member that supports the internal structure of the sensor case 20. The board support plate 25 is a member that supports a circuit board (not shown).

  The optical path cell 30 is a metal member including a light projecting surface portion 31, a light receiving surface portion 32, a base portion 33, and a suspension bolt 36. The light projecting surface portion 31 is provided with a light projecting window 34 configured using a member having translucency, and water to be measured is in contact with the outside. The light receiving surface portion 32 is provided so as to face the light projecting surface portion 31, and water to be measured is in contact with the outside. The light receiving surface portion 32 is provided with a light receiving window 35 configured using a member having translucency at a position facing the light projecting window 34. A wiper unit 40 to be described later is provided on the upper surface of the base 33. The suspension bolt 36 is provided at the top of the light receiving surface portion 32, and is used when the water quality measurement device is dipped and suspended in the water to be measured.

An annular structure 70 as a “projection unit annular member” provided so as to surround the projection path from the light source of the light source unit to the projection window 34 is rotatably supported inside the projection surface 31. Yes. Similarly, an annular structure 70 as a “light receiving portion annular member” provided to surround the light receiving path from the light receiving window 35 to the sensor of the sensor unit (not shown) is rotatable inside the light receiving surface portion 32. It is supported by.
The annular structure 70 provided inside the light projecting surface portion 31 and the annular structure 70 provided inside the light receiving surface portion 32 are members of exactly the same structure, so that the invention can be more easily understood. Therefore, in FIG. 2, the annular structure 70 inside the light projecting surface portion 31 is not shown. The same applies to FIGS. 3 and 4 described later.

  The water quality measuring apparatus according to the present invention further includes a motor 61, a coupling 62, a bearing shaft 63, a first gear 64, and a second gear 65. The motor 61 is an electric motor that is provided inside the sensor case 20 and rotates with electric power supplied via the cable connector 50. The coupling 62 is rotatably supported inside the sensor case 20 and connects the rotation shaft of the motor 61 and the bearing shaft 63 so as to be able to transmit rotation. The bearing shaft 63 is provided so as to penetrate from the inside of the sensor case 20 to the inside of the light source case 10 through the base portion 33 of the optical path cell 30.

  The first gear 64 is provided at the boundary between the sensor case 20 and the optical path cell 30 and is integrally attached to the bearing shaft 63. The first gear 64 meshes with the annular gear 71 of the annular structure 70 provided inside the light receiving surface portion 32. The second gear 65 is provided at the boundary between the light source case 10 and the optical path cell 30 and is integrally attached to the bearing shaft 63. The second gear 65 meshes with the annular gear 71 of the annular structure 70 provided inside the light projecting surface portion 31. Therefore, the annular structure 70 provided inside the light projecting surface portion 31 and the annular structure 70 provided inside the light receiving surface portion 32 are rotated by the rotational driving force of the motor 61 being transmitted.

<Configuration of optical path cell 30>
The configuration of the optical path cell 30 will be described with reference to FIGS.
3 and 4 are perspective views illustrating a cross section of a main part of the water quality measuring apparatus according to the present invention. FIG. 5 is an exploded perspective view illustrating the support structure of the annular structure 70.

  A circular convex portion 311 is formed inside the light projecting surface portion 31. The annular structure 70 is disposed in an annular space formed by the circular convex portion 311 and the outer peripheral surface 312 inside the light projecting surface portion 31. Three female screw holes 315 are formed in the circular convex portion 311. The annular structure 70 is rotatably supported by three support structures 66 attached to the circular convex portion 311 through the three female screw holes 315.

  More specifically, the support structure 66 includes a male screw 661, a flanged bearing 662, and a washer 663. The flanged bearing 662 is rotatably supported on the circular convex portion 311 by a male screw 661 screwed into the female screw hole 315. The annular structure 70 is supported by the three flanged bearings 662 in a state where the flange portions of the three flanged bearings 662 are engaged with a circumferential groove 712 formed on the inner peripheral surface of the annular gear 71.

  A through hole 313 that penetrates to the outside of the light projecting surface portion 31 is formed in the circular convex portion 311, and a light projection window 34 is provided in the through hole 313. The light projection window 34 is configured by arranging an O-ring, a translucent window member made of synthetic quartz glass, a resin washer, and a support ring in order from the outside. A gear accommodating portion 314 is formed in a portion corresponding to the second gear 65 inside the light projecting surface portion 31.

  A circular convex portion 321 is formed inside the light receiving surface portion 32. The annular structure 70 is disposed in an annular space formed by the circular convex portion 321 and the outer peripheral surface 322 inside the light receiving surface portion 32. Three female screw holes 325 are formed in the circular convex portion 321. Similar to the light projecting surface portion 31, the annular structure 70 is rotatably supported by three support structures 66 attached to the circular convex portion 321 through the three female screw holes 325.

  A through hole 323 that penetrates to the outside of the light receiving surface portion 32 is formed in the circular convex portion 321, and a light receiving window 35 is provided in the through hole 323. The light receiving window 35 is configured by arranging an O-ring, a light-transmitting window member formed of synthetic quartz glass, a resin washer, and a support ring in order from the outside, like the light projection window 34. A gear accommodating portion 324 is formed inside the light receiving surface portion 32 at a portion corresponding to the first gear 64.

<Configuration of annular structure 70>
The configuration of the annular structure 70 will be described with reference to FIGS. 6 and 7.
6 and 7 are exploded perspective views illustrating the structure of the annular structure 70.

  The annular structure 70 includes an annular gear 71, a magnet mounting ring 72, four magnets 73, three small spheres 74, and three countersunk screws 75.

  The annular gear 71 is an annular member, and a plurality of teeth are formed on the outer peripheral surface 711 at equal intervals, and a circumferential groove 712 that engages with the flanged bearing 662 of the support structure 66 is formed on the inner peripheral surface. . The annular gear 71 is formed with three female screw holes 713 penetrating from one surface side to the other surface side, and an annular recess 714 is formed on the one surface side.

  The magnet attachment ring 72 is an annular member, and a circular convex portion 721 that engages with the concave portion 714 of the annular gear 71 is formed on one surface side. Further, four circular recesses 722 are formed on one surface side of the magnet attachment ring 72. The four circular recesses 722 are formed two by two at positions shifted by about 180 degrees. Three circular recesses 723 are formed on the other surface side of the magnet attachment ring 72. The three circular recesses 723 are formed one by one at positions shifted by about 120 degrees in phase. Further, the magnet attachment ring 72 is formed with three through holes 724 penetrating from one surface side to the other surface side in a portion corresponding to the three female screw holes 713 of the annular gear 71.

  The four magnets 73 are columnar permanent magnets, and are provided in the four circular recesses 722 of the magnet attachment ring 72 so that the polarities are in the same direction. The three small spheres 74 are respectively provided in the three circular recesses 723 of the magnet attachment ring 72 in a partially protruding state. The three small spheres 74 are driven to rotate in contact with the inner side of the light projecting surface portion 31 or the inner side of the light receiving surface portion 32 and play a role of smooth rotation of the annular structure 70. The three countersunk screws 75 are male screws and are screwed into the female screw holes 713 of the annular gear 71 through the through holes 724 of the magnet attaching ring 72 to fasten the annular gear 71 and the magnet attaching ring 72.

<Configuration of wiper unit 40>
The configuration of the wiper unit 40 will be described with reference to FIG.
FIG. 8 is a perspective view of the wiper unit 40.

  The wiper unit 40 includes a light projection window wiper 41, a light receiving window wiper 42, and a wiper support portion 43.

  The light projection window wiper 41 is rotatably supported on the outside of the light projecting surface portion 31, and an attractive force due to a magnetic force acts between the annular structure 70 and the light projection window wiper 41. More specifically, the light projection window wiper 41 is provided with magnetic coupling portions 411 at both ends corresponding to the rotation trajectory of the magnet 73 of the annular structure 70. The magnetic coupling portion 411 is formed of a ferromagnetic material such as iron so that an attractive force due to a magnetic force acts between the magnet 73 of the annular structure 70. Further, the projection window wiper 41 is provided with two wiping members 412 between the magnetic coupling portions 411 at both ends. The wiping member 412 is a member for slidably contacting the light projecting window 34 or the light receiving window 35 to wipe off foreign matter. For example, a rubber material such as silicon or a hard material such as polyethylene (PE) or polypropylene (polypropylene: PP). It is preferable to form with resin.

  The light receiving window wiper 42 is rotatably supported on the outside of the light receiving surface portion 32, and an attractive force due to magnetic force acts between the annular structure 70 and the light receiving window wiper 42. More specifically, the light receiving window wiper 42 is provided with magnetic coupling portions 421 at both ends corresponding to the rotation trajectory of the magnet 73 of the annular structure 70 in the same manner as the light projecting window wiper 41, and the magnetic coupling at both ends is provided. Two wiping members 422 are provided between the coupling portions 421.

The wiper support portion 43 includes a shaft portion 431 and a mounting flange portion 432. One end side of the shaft portion 431 pivotally supports the light projection window wiper 41 and the other end side pivotally supports the light receiving window wiper 42. That is, the wiper support portion 43 pivotally supports the light projection window wiper 41 and the light receiving window wiper 42 so as to be independently rotatable. A through hole 433 is formed in the attachment flange portion 432. On the other hand, a female screw hole 331 is formed on the upper surface of the base portion 33 of the optical path cell 30 at a portion corresponding to the through hole 433 of the mounting flange portion 432. The wiper support portion 43 is fixed to the upper surface of the base portion 33 of the optical path cell 30 by a male screw (not shown) that is screwed into the female screw hole 331 through the through hole 433 of the attachment flange portion 432.
Note that the magnetic coupling between the light projecting window wiper 41 or the light receiving window wiper 42 and the annular structure 70 is provided with a ferromagnetic material such as iron in the annular structure 70, and the light projecting window wiper 41 or the light receiving window wiper 42 is permanently attached. It may be realized by providing a magnet, or may be realized by providing a permanent magnet on both.

<Operational effects of the water quality measuring apparatus according to the present invention>
As described above, the water quality measuring device according to the present invention having the above-described configuration is rotatably supported on the outer side of the light projecting surface portion 31 and the annular structure 70 supported on the inner side of the light projecting surface portion 31. An attractive force due to magnetic force acts between the projection window wiper 41 and the projection window wiper 41. Therefore, when the rotational driving force of the motor 61 is transmitted and the annular structure 70 rotates, the projection window wiper 41 provided outside the light projecting surface portion 31 receives the rotational driving force acting on the annular structure 70. Rotate. As a result, foreign matter or the like attached to the light projection window 34 outside the light projection surface portion 31 is wiped and removed by the wiping member 412 of the light projection window wiper 41.

  The annular structure 70 is an annular member provided on the light projecting surface portion 31 so as to surround the light projecting path from the light source to the light projecting window 34. Therefore, the rotating annular structure 70 does not cross the light projecting path from the light source to the light projecting window 34. Accordingly, since it is not necessary to provide a certain distance or more between the light source and the projection window 34, for example, it is possible to provide a light source at a position close to the projection window 34, and between the light source and the projection window 34. Can be significantly reduced. Thereby, since the light projection efficiency of the light projection surface part 31 can be improved, the measurement accuracy of water quality can be improved.

  Similarly, an attractive force due to magnetic force acts between the annular structure 70 rotatably supported inside the light receiving surface portion 32 and the light receiving window wiper 42 rotatably supported outside the light receiving surface portion 32. . Accordingly, when the rotational driving force of the motor 61 is transmitted and the annular structure 70 is rotated, the light receiving window wiper 42 provided outside the light receiving surface portion 32 is rotated by the rotational driving force acting on the annular structure 70 being transmitted. . As a result, foreign matter or the like adhering to the light receiving window 35 outside the light receiving surface portion 32 is wiped and removed by the wiping member 422 of the light receiving window wiper 42.

  The annular structure 70 is an annular member provided on the light receiving surface portion 32 so as to surround the light receiving path from the light receiving window 35 to the sensor. Therefore, the rotating annular structure 70 does not cross the light receiving path from the light receiving window 35 to the sensor. Accordingly, since it is not necessary to provide a certain distance or more between the sensor and the light receiving window 35, for example, it is possible to provide a sensor at a position close to the light receiving window 35, and the distance between the sensor and the light receiving window 35 can be reduced. It can be greatly reduced. As a result, the light receiving efficiency of the light receiving surface portion 32 can be increased, so that the measurement accuracy of water quality can be improved.

<Other embodiments and modifications>
The present invention is not particularly limited to the embodiments described above, and it goes without saying that various modifications are possible within the scope of the invention described in the claims.

  For example, in the embodiment described above, only the annular structure 70 and the projection window wiper 41 of the light projecting surface portion 31 or the annular structure 70 and the light receiving window wiper 42 of the light receiving surface portion 32 may be provided. Even in such a configuration, the effects of the present invention can be obtained.

  Further, for example, in the embodiment described above, the motor 61 may be always rotated so that the light projection window wiper 41 and the light receiving window wiper 42 are always rotated. In this case, it is preferable to provide a control unit (not shown) for measuring the water quality from the light receiving level only when the light receiving level of the sensor provided inside the light receiving surface portion 32 is equal to or higher than a certain threshold value. Accordingly, the water quality can be accurately measured without being affected by the rotating light projection window wiper 41 or the light receiving window wiper 42. Thereby, for example, without detecting the rotational position of the light projection window wiper 41 or the light reception window wiper 42, erroneous measurement caused by the rotating light projection window wiper 41 or the light reception window wiper 42 can be prevented in advance and the water quality can be accurately determined. Can be measured. Such a control unit may be mounted on, for example, a circuit board (not shown) inside the sensor case 20, or may be configured as an external device that processes the output signal of the water quality measurement device.

DESCRIPTION OF SYMBOLS 10 Light source case 20 Sensor case 30 Optical path cell 31 Light emission surface part 32 Light reception surface part 34 Light emission window 35 Light reception window 40 Wiper unit 41 Light emission window wiper 42 Light reception window wiper 70 Annular structure 71 Annular gear 72 Magnet attachment ring 73 Magnet

Claims (4)

A light projecting surface portion in contact with water to be measured, a light projecting window provided on the light projecting surface portion with a translucent member, and provided at a position corresponding to the light projecting window inside the light projecting surface portion. A light projecting unit including a light source;
A light-receiving surface portion that is provided facing the light-projecting surface portion, contacts the outside of the measurement target water, is provided on the light-receiving surface portion with a light-transmitting member, and faces the light-projecting window. A light receiving portion including a sensor provided at a position corresponding to the light receiving window on the inside;
An annular member that is rotatably supported inside the light projecting surface portion and is provided so as to surround a light projecting path from the light source to the light projecting window, and is rotated by a driving force transmitted thereto. Members,
A water quality measuring device comprising: a projection window wiper that is rotatably supported on the outside of the projection surface portion, and that attracts magnetic force between the projection unit annular member. A light projecting surface portion in contact with water to be measured, a light projecting window provided on the light projecting surface portion with a translucent member, and provided at a position corresponding to the light projecting window inside the light projecting surface portion. A light projecting unit including a light source;
A light-receiving surface portion that is provided facing the light-projecting surface portion, contacts the outside of the measurement target water, is provided on the light-receiving surface portion with a light-transmitting member, and faces the light-projecting window. A light receiving portion including a sensor provided at a position corresponding to the light receiving window on the inside;
A ring-shaped member that is rotatably supported inside the light-receiving surface portion and is provided so as to surround a light-receiving path from the light-receiving window to the sensor;
A water quality measuring device comprising: a light receiving window wiper that is rotatably supported on the outer side of the light receiving surface portion, and that attracts magnetic force to the light receiving portion annular member. The water quality measuring device according to claim 1, wherein the water quality measuring device is an annular member that is rotatably supported inside the light receiving surface portion and is provided so as to surround a light receiving path from the light receiving window to the sensor. A rotating light receiving portion annular member,
A water quality measuring device, further comprising: a light receiving window wiper that is rotatably supported on the outer side of the light receiving surface portion and acts by a magnetic force between the light receiving portion annular member.   The water quality measuring apparatus according to any one of claims 1 to 3, further comprising a control unit that measures water quality from the light reception level only when the light reception level of the sensor is equal to or greater than a certain threshold value. measuring device.

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