JP5082526B2 - Detector and water quality measuring device - Google Patents

Description

  The present invention relates to a detector and a water quality measuring device used for measuring the quality of drinking water supplied via a pipe.

  Water quality management of the water supply line from the water purification source to each end requires more detailed management, including monitoring of aging of pipe materials, especially in urban areas where water supply pipes are complicated and complicated. It has become to. In this case, measuring instruments that measure basic measurement items in terms of ministerial ordinances related to water quality standards such as pH, conductivity, turbidity, chromaticity, and residual chlorine are provided at a plurality of measurement points. Among these basic measurement items, pH, conductivity, residual chlorine, and the like can be measured by inserting an electrochemical electrode into the liquid to be measured.

  Turbidity and chromaticity can be detected by irradiating a liquid to be measured with a light beam from a light source and measuring the transmitted light. Note that since turbidity and chromaticity are measured in the same manner, there is a measuring instrument that measures and corrects turbidity and chromaticity simultaneously.

Here, in a turbidimeter equipped with a measurement water tank for storing measurement water, a light projector for forming a measurement light path in the measurement water tank, and a light receiver for receiving a light beam of the measurement light path generated by the light projector, bubbles, etc. Conventionally, a technique for reducing the error factor has been proposed (see, for example, Patent Document 1).
This Patent Document 1 discloses measurement water inlet means for supplying via a buffer means through a predetermined inlet passage from a position higher than a position where a measurement optical path is formed, and measurement water drained from a lower position than the measurement optical path through an outlet passage. An arrangement having outlet means is disclosed. The buffer means is configured to provide a float that opens and closes depending on the flow rate of the measurement water at the upper portion of the inlet passage, and buffers the measurement water pouring state with the float. Then, slowly inject the measurement water from the position above the measurement optical path of the measurement water tank so that the bubbles do not diffuse in the measurement water tank, and it is easy to separate from the bubbles that tend to rise by flowing slowly, so that it dissolves in the measurement water. The air bubbles are detoured so that they do not pass through the measurement optical path.

JP 2006-200959 A

  As described above, since measuring instruments are arranged at a plurality of measurement points in order to manage the water quality of the water supply line, the measuring instruments are required to be reduced in cost and size. That is, the ideal water quality management is to measure the quality of the water at the end of the distribution pipe that is finally consumed by the customer, monitor whether the value is appropriate, and manage it appropriately. For this reason, to install in homes and collective houses that are consumers, it is necessary to control the unit price and installation cost of the measuring instrument due to budget constraints, and the measuring instrument is downsized due to restrictions such as installation location There is a need to.

  However, the configuration for measuring pH, conductivity, residual chlorine, etc. can be reduced in size by reducing the size of the electrochemical electrode itself, and further reduced in size and cost by integrating each electrode. Is possible.

  However, the configuration for measuring turbidity and chromaticity is based on the optical principle, and the optical system becomes complicated, so it is difficult to reduce the size and cost. Furthermore, a conventionally proposed technique cannot cope with a configuration that realizes a configuration for reducing an error factor such as bubbles at a low cost and a small size. That is, with the conventional structure, it is difficult to achieve cost reduction, downsizing, and high accuracy.

  The present invention has been made to solve the technical problems as described above, and the object of the present invention is to reduce the cost and reduce the size and improve the accuracy of the configuration for measuring turbidity and chromaticity. It is an object of the present invention to provide a detector and a water quality measuring device that make it possible.

For this purpose, a detector to which the present invention is applied has a region defined by a plurality of surfaces including a floor surface, a ceiling surface, and a wall portion, and an inflow portion through which sample water flows into the region. A cell having an outflow part on the ceiling surface on which the sample water flows out from the area, and a light emitting part that emits light for measuring the sample water from the wall of the cell to the area of the cell, A light-receiving unit that receives light emitted from the light-emitting unit, and a light-emitting unit and a reflective unit that is disposed to face the light-receiving unit, wherein the light-emitting unit, the light-receiving unit, and the reflective unit measuring optical path to the light receiving portion is Ri Do the V-shaped reflection once from parts, and between the upper end and the ceiling surface of the measurement path, air bubbles contained in the sample water flowing into the inside area Enters into the measurement optical path when moving toward the outflow portion along the ceiling surface DOO as not, is disposed so that a predetermined gap is formed, the light emitting portion and the one wall on the side where the reflective portion and the side where the light receiving portion is disposed is arranged The inflow portion is located near the other wall portion, the outflow portion is located near the other wall portion, and the inflow portion is located outside the measurement optical path in plan view .

From another viewpoint, the water quality measuring device to which the present invention is applied is a water quality measuring device that measures a plurality of items including turbidity and / or chromaticity, and includes a floor surface, a ceiling surface, and a wall portion. A cell having an area defined by a plurality of surfaces, having an inflow portion on the floor surface where sample water flows into the region, and an outflow portion on the ceiling surface where sample water flows out from the region; A detection unit that emits light for measuring sample water from the wall to the region of the cell and detects at least one of a transmission amount and a scattering amount; and turbidity and / or color of the sample water using the detection result A detector that calculates the degree of light, and the detector is configured to emit light for measuring sample water from the wall of the cell to the region of the cell, and to receive light emitted by the light emitter. And a reflecting portion disposed to face the light emitting portion and the light receiving portion. For example, the light emitting portion, the light receiving portion and the reflecting portion, the measurement optical path from the light-emitting unit to the light receiving portion is Ri Do the V-shaped reflection once, and the upper end of the measurement path wherein the ceiling surface A predetermined gap is formed so that air bubbles contained in the sample water flowing into the region do not enter the measurement optical path when moving toward the outflow portion along the ceiling surface. The inflow portion is located in the vicinity of one of the wall portion on the side where the light emitting portion and the light receiving portion are disposed and the side where the reflecting portion is disposed, The outflow portion is located in the vicinity of the wall portion, and the inflow portion is located outside the measurement optical path in plan view.

  According to the present invention, it is possible to improve the accuracy of the configuration for measuring turbidity and chromaticity as well as reducing the cost and size.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a schematic front view showing a detector 1 according to the present embodiment, and FIG. 2 is a schematic plan view showing the detector 1 according to the present embodiment.
A detector 1 shown in FIGS. 1 and 2 irradiates a cell (measurement tank, measurement cell) 2 connected to pipes P1, P2 through which sample water flows, and light (light for measuring sample water) in the cell 2. A light source (light emitting unit) 3, a light receiving unit 4 that receives light from the light source 3, a reflection mirror 5 that is disposed on a wall that faces the wall on which the light source 3 and the light receiving unit 4 are disposed, and incident light intensity And a comparative light receiving unit 31 for measuring. This detector 1 measures the turbidity and chromaticity of sample water using the transmitted light method.

More specifically, the detector 1 applies light to the cell 2 and measures the transmitted light. That is, turbidity and the like are detected by utilizing the fact that the measured degree of attenuation of transmitted light is related to the concentration of suspended substances in the sample water. In other words, turbidity and chromaticity are measured using the property that light transmitted through the sample water is attenuated by being absorbed by suspensions and chromaticity components in the sample water. In addition, the comparative light receiving unit 31 of the light source 3 is for measuring the intensity of light (incident light intensity) when there is no absorption.
The detector 1 employs a so-called continuous measurement method using a flow cell.

  The light source 3 and the light receiving unit 4 are disposed adjacent to each other, and the reflection mirror 5 is disposed separately from the light source 3 and the light receiving unit 4. In this way, the light source 3, the light receiving unit 4, and the reflection mirror 5 are arranged so that the measurement optical path O has a V-shape reflecting once. Therefore, it is possible to secure a sufficient length of the measurement optical path O while realizing miniaturization of the detector 1 and enable highly accurate measurement.

The cell 2 is connected to a region A defined by a plurality of surfaces including a floor portion (floor surface) 23, a ceiling portion (ceiling surface) 24, and a wall portion (wall surface) 25, and an upper end of the upstream pipe P1. And a supply part (inflow part) 21 for supplying the sample water to the area A and a discharge part (outflow part) 22 connected to the lower end of the downstream pipe P2 and for discharging the sample water from the area A. . That is, the sample water supplied from the upstream pipe P1 through the supply unit 21 is discharged from the discharge unit 22 through the region A.
The region A is formed so as to extend in the horizontal direction (lateral direction) H inside the cell 2.

  Here, as shown in FIG. 1, the supply unit 21 of the cell 2 is disposed on the floor 23 of the cell 2, and the discharge unit 22 is disposed on the ceiling 24 of the cell 2. That is, the sample water flows from the bottom to the top, and the sample water is supplied to the region A of the cell 2 from below, and the sample water in the region A of the cell 2 is discharged upward.

  Further, in the area A of the cell 2, a gap having a gap dimension δ is formed between the ceiling portion 24 of the cell 2 and the upper end of the measurement optical path O. As will be described later, the gap dimension δ is a dimension such that bubbles that have flowed into the region A of the cell 2 together with the sample water do not enter the measurement optical path O.

  As shown in FIG. 2, the positions of the supply unit 21 and the discharge unit 22 in plan view are different from each other. That is, the supply unit 21 is located on the side where the light source 3 and the light receiving unit 4 are disposed, and the discharge unit 22 is located on the side where the reflection mirror 5 is disposed. For this reason, the sample water supplied to the area | region A of the cell 2 from the supply part 21 is discharged | emitted from the discharge part 22, without staying, and replacement | exchange of sample water is performed smoothly.

  More specifically, the supply unit 21 is disposed at a position deviating from the measurement optical path O from the light source 3 through the reflection mirror 5 to the light receiving unit 4 (outside of the measurement optical path O) in plan view, and the discharge unit 22 is Are disposed at positions overlapping the measurement optical path O. In addition, the supply unit 21 is disposed so as to be positioned between the light source 3 and the light receiving unit 4, and the discharge unit 22 is disposed adjacent to the reflection mirror 5.

Next, the operation of the detector 1 will be described.
As shown in FIG. 1, when sample water is supplied from the supply unit 21 to the region A of the cell 2, bubbles and the like that have flowed from the supply unit 21 together with the sample water are upward from the supply unit 21 in the vertical direction V due to the buoyancy. Ascend (upward). At this time, bubbles or the like proceed upward from the supply unit 21 without crossing the measurement optical path O (see FIG. 2), and eventually reach the ceiling 24 or the vicinity of the ceiling 24.

  In the area A of the cell 2, the sample water flows toward the discharge unit 22. For this reason, bubbles or the like that have reached the ceiling portion 24 proceed to the discharge portion 22 according to the flow of the sample water, and are discharged together with the sample water from the discharge portion 22 to the pipe P2. At that time, bubbles or the like pass above the measurement optical path O and do not enter the measurement optical path O.

  As described above, the bubbles and the like that flowed together with the sample water from the supply unit 21 rise as a result of the buoyancy so as not to enter the measurement optical path O as shown by the broken line in FIG. And is discharged from the discharge unit 22. For this reason, bubbles and the like do not affect the optical measurement.

  More specifically, it is not necessary to positively remove bubbles or the like before supplying sample water from the supply unit 21 of the cell 2, and after sample water is supplied from the supply unit 21 of the cell 2 together with bubbles or the like. Since it is not necessary to use a device that actively controls the movement of bubbles and the like, the influence of bubbles and the like can be eliminated with a simple configuration. That is, the detector 1 that is not affected by bubbles or the like during measurement can be realized in a small size and at low cost.

  In the present embodiment, the ceiling portion 24 of the cell 2 is formed so as to extend in the horizontal direction H. However, in order to form a flow of bubbles or the like toward the discharge portion 22 more smoothly, It is also conceivable to incline the ceiling portion 24 of the cell 2 so that the position is located on the upper side.

Here, FIG. 3 is a schematic plan view showing the detector 1 according to a modification. The basic configuration of the detector 1 shown in FIG. 3 is the same as that of the detector 1 shown in FIGS.
The cell 2M1 of the detector 1 shown in FIG. 3 has a substantially trapezoidal shape in plan view, and the area A of the cell 2M1 can be minimized. For this reason, compared with the rectangular cell 2 shown in FIG. 2, the retention of the sample water supplied from the supply unit 21 to the region A of the cell 2M1 can be prevented, and the outer shape can be made compact. It becomes possible.
Further, the cell 2M1 is formed in a so-called wedge shape in which the dimension in the width direction of the ceiling portion 24 becomes narrower as it proceeds from the position of the supply portion 21 toward the discharge portion 22 in plan view. For this reason, bubbles or the like that have traveled upward from the supply unit 21 and reached the ceiling 24 are smoothly discharged from the discharge unit 22.

FIG. 4 is a schematic plan view showing a detector 1 according to another modification. The basic configuration of the detector 1 shown in FIG. 4 is the same as that of the detector 1 shown in FIGS.
The cell 2M2 of the detector 1 shown in FIG. 4 has a substantially circular shape in plan view. For this reason, if the installation space is circular, using the detector 1 shown in FIG. 4 is advantageous in terms of space. Further, the cell 2M2 can be easily manufactured as compared with the rectangular shape, and the manufacturing cost can be reduced.

FIG. 5 is a block diagram for explaining the configuration of the water quality measuring apparatus 100 to which the detector 1 is applied. The above-described detector 1 can be applied to a water quality measuring device that performs multi-item water quality measurement including turbidity and chromaticity. In FIG. 5, the detector 1 is illustrated as constituting a part of the detection unit 101.
A water quality measurement apparatus 100 shown in FIG. 5 includes a detection unit 101 that detects multiple items including turbidity and chromaticity, an instruction unit 102 for a user to give an operation instruction to the detection unit 101, and a detection result of the detection unit 101. The calculation control unit 103 that performs calculation based on the calculation and controls each unit, the display unit 104 that displays the calculation result by the calculation control unit 103, and the various types used by the calculation control unit 103 while storing the detection result of the detection unit 101 And a storage unit 105 for storing the data.

Here, the detection result of the detection unit 101 includes the detection result of the comparative light receiving unit 31 and the detection result of the light receiving unit 4. That is, turbidity and chromaticity measurement will be briefly described. Light emitted from the light source 3 (see FIG. 2) is transmitted through the sample water, and the light receiving unit 4 receives the light.
Then, the arithmetic control unit 103 obtains the degree of light attenuation based on the electrical signal as the detection result of the comparison light receiving unit 31 and the electrical signal as the detection result of the light receiving unit 4, and is stored in the storage unit 105 in advance. The turbidity and chromaticity are calculated using a predetermined calculation formula.

  Note that the arithmetic control unit 103 can be configured by a CPU or the like, for example. The display unit 104 can be configured with, for example, a digital display, and the storage unit 105 can be configured with, for example, a nonvolatile memory.

It is a schematic front view which shows the detector which concerns on this Embodiment. It is a schematic plan view which shows the detector which concerns on this Embodiment. It is a schematic plan view which shows the detector which concerns on a modification. It is a schematic plan view which shows the detector which concerns on another modification. It is a block diagram for demonstrating the structure of the water quality measuring apparatus with which a detector is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Detector, 2, 2M1, 2M2 ... Cell, 21 ... Supply part, 22 ... Discharge part, 23 ... Floor part, 24 ... Ceiling part, 25 ... Wall part, 3 ... Light source, 31 ... Light receiving part for comparison, 4 DESCRIPTION OF SYMBOLS ... Light-receiving part, 5 ... Reflection mirror, 100 ... Water quality measuring device, 101 ... Detection part, 102 ... Instruction part, 103 ... Calculation control part, 104 ... Display part, 105 ... Memory | storage part, A ... Area | region, H ... Horizontal direction, O ... Measurement optical path, P1, P2 ... Piping, V ... Vertical direction, δ ... Gap size

Claims (2)

It has a region defined by a plurality of surfaces including a floor surface, a ceiling surface, and a wall portion, and has an inflow portion on the floor surface through which sample water flows into the region, and an outflow from which sample water flows out from the region. A cell having a portion on the ceiling surface;
A light emitting unit that emits light for measuring sample water from the wall of the cell to the region of the cell;
A light receiving portion for receiving light emitted by the light emitting portion;
A reflecting portion disposed to face the light emitting portion and the light receiving portion;
Including
The light emitting portion, the light receiving portion and the reflecting portion, the measurement optical path from the light-emitting unit to the light receiving portion is Ri Do the V-shaped reflection once, and, between the upper end and the ceiling surface of the measurement path in, so as not to enter into the measurement optical path when the air bubbles contained in the sample water flowing into the region to move toward the outlet portion along the ceiling surface, so that a predetermined gap is formed Arranged in
The inflow portion is located in the vicinity of one of the walls on the side where the light emitting portion and the light receiving portion are disposed and the side on which the reflecting portion is disposed, and near the other wall portion. The outflow is located,
The detector is characterized in that the inflow portion is located outside the measurement optical path in plan view. A water quality measuring device for measuring a plurality of items including turbidity and / or chromaticity,
It has a region defined by a plurality of surfaces including a floor surface, a ceiling surface, and a wall portion, and has an inflow portion on the floor surface through which sample water flows into the region, and an outflow from which sample water flows out from the region. A cell having a portion on the ceiling surface;
A detector that emits light for measuring sample water from the wall to the region of the cell and detects at least one of the transmitted amount and the scattered amount;
A calculation unit for calculating the turbidity and / or chromaticity of the sample water using the detection result;
Including
The detector is
A light emitting unit that emits light for measuring sample water from the wall of the cell to the region of the cell;
A light receiving portion for receiving light emitted by the light emitting portion;
A reflecting portion disposed to face the light emitting portion and the light receiving portion;
With
The light emitting portion, the light receiving portion and the reflecting portion, the measurement optical path from the light-emitting unit to the light receiving portion is Ri Do the V-shaped reflection once, and, between the upper end and the ceiling surface of the measurement path in, so as not to enter into the measurement optical path when the air bubbles contained in the sample water flowing into the region to move toward the outlet portion along the ceiling surface, so that a predetermined gap is formed Arranged in
The inflow portion is located in the vicinity of one of the walls on the side where the light emitting portion and the light receiving portion are disposed and the side on which the reflecting portion is disposed, and near the other wall portion. The outflow is located,
The water quality measuring device, wherein the inflow portion is located outside the measurement optical path in plan view.

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