JP3724735B2 - Cleaning method for working electrode of residual chlorine meter and residual chlorine meter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a residual chlorine measuring method and a residual chlorine meter, and more particularly to a residual chlorine measuring method and a residual chlorine meter with an improved structure relating to electrode cleaning in an apparatus for measuring residual chlorine in water.
[0002]
[Prior art]
As shown in Fig. 4, the residual chlorine meter of the first example in the prior art is a polarographic method using a rotating metal rod, and can rotate in glass beads and perform long-term stable measurements while performing continuous automatic cleaning. The test water storage chamber 101 that receives and stores the test water and the counter electrode storage chamber 102 that is provided so that the test water passes through the test water storage chamber 101 with a gap therebetween. A rotating electrode 103 rotatably disposed in the test water storage chamber 101, a working electrode 104 provided at a lower end of the rotating electrode 103, and a plurality of glass beads disposed so as to be in contact with and buried around the working electrode 104 105 and a counter electrode 106 disposed in the counter electrode storage chamber 102 and disposed in a positional relationship opposite to the rotating electrode 103 in which the test water storage chamber 101 is disposed.
[0003]
In the residual chlorine meter having such a configuration, a current flows between the counter electrode 106 and the working electrode 104 while rotating the rotating electrode 103 and always frictionally engaging the surface of the working electrode 104 with the glass beads 105 and automatically washing the surface. The degree of residual chlorine is measured by detecting the degree.
[0004]
The residual chlorine meter of the other second example is one in which the electrode is fixed and, instead, the cleaning structure is miniaturized by moving small glass beads in the flow of test water to hit the metal electrode. As shown in FIG. 5, the structure includes a test water storage chamber 111 that receives and stores test water, and a bead storage portion 113 that has a conical shape so that glass beads 112 gather at the bottom of the test water storage chamber 111. An electrode 114 disposed so as to face the bead reservoir 113 at the bottom of the test water storage chamber 111 and facing the test water storage chamber 111 from an oblique direction, and a gold electrode provided at the tip of the electrode 114 A working electrode 115, a glass bead 112 disposed in the bead reservoir 113 so as to collide with the surface of the working electrode (gold electrode) 115, and a capillary tube that guides the test water to the bead reservoir 113 of the test water storage chamber 111. It consists of a water guide pipe 116 and an overflow outlet 117 through which overflowed test water flows to the upper position of the test water storage chamber 111.
[0005]
In the residual chlorine meter having such a structure, by passing the test water through the test water guide tube 116 which is a thin tube, the test water directly hits and hits the glass beads 112 gathered in the conical bead reservoir 113. The glass bead 112 strikes the surface of the working electrode (gold electrode) 115 of the electrode, and the surface of the working electrode 115 is washed to drop the flow.
[0006]
As shown in FIG. 6, the residual chlorine meter of the third example has a test water storage chamber 121 formed in a cylindrical shape, and a working electrode 122 provided at the end of the electrode at the bottom of the test water storage chamber 121. The fixed electrode 123 arranged so as to face, the glass beads 124 stored so as to be in contact with the surface of the working electrode 122, and the lower position of the test water storage chamber 121, which are stored A test water inlet portion 125 is arranged so that the test water flows in the direction of the glass beads 124.
[0007]
When a test water is supplied from the test water inlet portion 125 to the glass bead 124 normally stored in a stationary state at the bottom of the test water storage chamber 121, the residual chlorine meter having such a structure has its test water. The glass beads 124 are agitated, and the glass beads 124 are agitated, and the agitated glass beads 124 are stirred while contacting the surface of the working electrode 122 facing from the bottom, so that the surface of the working electrode 122 is automatically cleaned.
[0008]
As shown in FIG. 7, the residual chlorine meter of the fourth example is provided with a test water storage chamber 131 formed in a cylindrical shape, and a glass bead 133 with a mesh 132 that inputs the test water to the bottom of the test water storage chamber 131. Is provided at the lower end of the fixed electrode 135, and a fixed electrode 135 provided at the center of the detected water storage chamber 131 so as to face the detected water inlet 134. The working electrode 136 and the glass beads 133 arranged to be stored at the bottom of the test water storage chamber 131.
[0009]
In the residual chlorine meter having such a structure, when sample water is inputted from the water sample inlet 134, the glass beads 133 are blown up like a fountain by the inputted water sample, and the glass beads 133 are placed on the surface of the working electrode 136. The surface of the working electrode 136 is automatically cleaned by hitting it.
[0010]
As shown in FIG. 8, the residual chlorine meter of the fifth example rotates glass beads by test water and automatically cleans the glass beads in contact with the surface of the electrode by this rotational force. A measurement tank 141 having a hollow inside of the housing, a test water introduction pipe 142 for inputting test water to the bottom side of the measurement tank 141, and a semicircular shape formed at a position opposite to the test water introduction pipe 142 A bead introduction path 144 serving as a flow path for the glass beads 143, a circular counter electrode 145 provided at the center of the bead introduction path 144 formed in a semicircular shape at a lower position of the measurement tank 141, and a bead introduction path A working electrode 146 disposed at an intermediate position of 144 facing the introduction path, a comparison electrode 147 provided at an upper position of the measurement tank 141, an overflow outlet 148 provided at an upper position of the comparison electrode 147, and a working electrode 146 , Counter electrode 1 5, consisting of the measurement unit 150. for measuring the residual chlorine receives the signal from the comparison electrode 147.
[0011]
In the residual chlorine meter having such a structure, first, when sample water is introduced into the sample water introduction pipe 142 with respect to the glass beads 143 arranged at the bottom of the measurement tank 141, the sample is introduced from the outlet of the sample water introduction pipe 142. The test water comes out, the glass beads 143 at the bottom are poured into the bead introduction path 144, and the working electrode 146 provided on the side wall surface 149 is washed by rubbing with the glass beads 143, along the circumference of the circular counter electrode 145. The glass beads 143 rotate.
[0012]
[Problems to be solved by the invention]
However, in the various residual chlorine meters described in the prior art, there is a problem that only fine glass beads can be stirred because the flow rate of test water is small.
[0013]
In addition, if the flow rate and flow rate of the test water vary, the movement of the beads changes, the cleaning effect is not constant, and there is a problem that it can only be used for water purification.
[0014]
Furthermore, if the electrode is cleaned by rubbing with glass beads, a cleaning effect can be expected even in dirty water such as river water, but it requires a function to extract a signal from a large power and rotating electrode with a small contact resistance. There is a problem that becomes complicated.
[0015]
Therefore, even with a small amount of sample water, there is a problem that must be solved to an electrode structure that can be expected to have a cleaning effect.
[0016]
[Means for Solving the Problems]
In order to solve the above-described problems, the working electrode cleaning method and residual chlorine meter of the residual chlorine meter according to the present invention are configured as follows.
[0017]
(1) The method of cleaning the working electrode of the residual chlorine meter is to store the test water and form the bottom part of the measuring tank formed in a vertically long bottomed cylindrical shape into a mortar shape, and the mortar shape The test water is input from the horizontal direction of the bottom formed in the horizontal direction, and the ceramic beads gathered at the bottom formed in the mortar shape by the input of the test water from the horizontal direction are opposite to the side where the test water is input. to face the direction of the wall surface is increased while rubbing the working electrode that is disposed, by cyclically ceramic beads to collect in the bottom that the mortar-shaped shape after Noboru Ue that so as to rub the working electrode It is.
[0018]
(2) Residual chlorine meter is a measuring tank that stores test water and is formed in a vertically long bottomed cylindrical shape, beads arranged in the measuring tank, and a mortar shape at the bottom of the measuring tank A bead collecting unit, a test water inlet nozzle unit for inputting test water from the horizontal direction to the bead collecting unit, and a working electrode disposed with a face of the electrode facing the test water inlet nozzle unit And a composite electrode disposed at the upper position of the working electrode and facing the counter electrode and the comparison electrode in the measurement tank.
(3) The residual chlorine meter as set forth in (2), wherein the test water inlet nozzle portion is provided with nozzle cleaning means capable of cleaning the inner surface of the nozzle with a nozzle cleaning brush.
(4) The composite electrode includes a counter electrode formed in a cylindrical shape, a reference electrode provided at a center position of the counter electrode, and a resistance temperature detector provided at an inner position of the reference electrode. Residual chlorine meter.
(5) The residual chlorine meter according to (2), wherein the beads are ceramic beads.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a residual chlorine measuring method and a residual chlorine meter according to the present invention will be described with reference to the drawings.
[0020]
The residual chlorine meter that can embody the method for measuring residual chlorine according to the present invention, as shown in FIGS. 1 to 3, stores test water and forms a bottomed cylindrical shape that is long in the vertical direction, A measuring tank 11 having a reduced diameter on the bottom side, an overflow drain 12 for receiving the sample water overflowed from the measuring tank 11, ceramic beads 13 arranged at the bottom of the measuring tank 11, and the bottom of the measuring tank 11 in a mortar A bead collecting part 14 shaped into a mold, a test water inlet nozzle part 15 for inputting test water into the bead collecting part 14 from the horizontal direction, and a pole surface facing the position facing the test water inlet nozzle part 15 A working electrode 16 composed of a gold electrode disposed, a composite electrode 19 disposed above the working electrode 16 and facing the counter electrode 17 and the comparison electrode 18 in the measurement tank 11, and the composite electrode 19 and the working electrode. Solve the signal from 16 And a measuring unit 20 for.
[0021]
The measurement tank 11 includes a sample water inlet valve 21 for introducing sample water into the upper position of the water sample inlet nozzle section 15 and a water sample sampling valve 22 at the bottom for sampling the water sample. It has become.
Further, an overflow pipe 23 (see FIG. 3) for flowing the overflowed test water is provided in parallel with the measurement tank 11, and a drain joint 24 (see FIG. 1) is provided at the bottom of the overflow pipe 23. Yes. The overflow pipe 23 receives the test water flowing out from the overflow drain 12 provided in the measurement tank 11 and discharges it from the drain joint 24.
[0022]
The test water inlet nozzle portion 15 includes a nozzle cleaning brush 25 that cleans the inner surface of the nozzle. The nozzle cleaning brush 25 is connected to an external handle 26, and the handle 26 is manually operated. The nozzle inner surface can be cleaned with the nozzle cleaning brush 25 by moving the nozzle.
[0023]
As shown in FIGS. 1 and 2, the composite electrode 19 is disposed in an electrode housing 27, and has a counter electrode 17 formed in a cylindrical shape, a comparison electrode 18 provided at the center position of the counter electrode 17, and the comparison electrode 18. And a resistance temperature detector 28 provided at the inner position. Such a composite electrode 19 is configured to be inserted into an electrode fitting portion 29 provided in the measurement tank 11 and fixed to the measurement tank 11 by the electrode engagement portion 30.
[0024]
Thus, in the residual chlorine meter of the present invention, in order to improve the cleaning effect, the ceramic beads 13 are provided instead of the glass beads, and the bead collecting part 14 having a mortar-shaped bottom is provided. It is configured to be collected in the bead collecting unit 14 which is the bottom.
[0025]
And if test water is poured into the test water inlet nozzle part 15 which spouts in a horizontal direction, test water will flow along the wall surface on the opposite side. The ceramic beads 13 soar along the flow and fall to the opposite side when the flow velocity falls, so that the ceramic beads 13 rotate. By burying the electrode (working electrode) 16 in the wall surface, continuous cleaning with the ceramic beads 13 can be performed.
[0026]
Thus, the bottom surface of the measuring tank 11 in the bowl-shaped ceramic beads 13 so as always collects in the bottom, and the test water inlet nozzle 15 to the bottom of the bowl-shaped provided, for injecting test water horizontally in the this, it is possible to successively washed with ceramic beads 13 to pivot the gold electrode (working electrode) 16 provided on the wall falling along the opposite wall of the nozzle opening.
Furthermore, the counter electrode (silver electrode) 17 and the comparison electrode 18 and the resistance temperature detector 28 are incorporated in the three-electrode method, the counter electrode (silver electrode) 17 is formed in a ring shape, and the reference electrode 18 is provided in the center. By providing the resistance temperature detector 28 inside the counter electrode (silver electrode) 17, temperature correction can be performed.
[0027]
【The invention's effect】
As described above, the method for cleaning the working electrode of the residual chlorine meter and the residual chlorine meter according to the present invention can be rotated by blowing up the beads with a small amount of test water since the beads gather at the bottom of the conical shape. Since the blown beads rise on the electrode side, there is an effect that the cleaning power is large.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a residual chlorine meter according to the present invention.
FIG. 2 is a schematic cross-sectional view showing the composite electrode.
FIG. 3 is a plan view of the residual chlorine meter.
FIG. 4 is a schematic cross-sectional view showing a residual chlorine meter in the prior art.
FIG. 5 is a schematic cross-sectional view showing a residual chlorine meter in the prior art.
FIG. 6 is a schematic cross-sectional view showing a residual chlorine meter in the prior art.
FIG. 7 is a schematic cross-sectional view showing a residual chlorine meter in the prior art.
FIG. 8 is a schematic cross-sectional view showing a residual chlorine meter in the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Measurement tank 12 Overflow drain port 13 Ceramic beads 14 Bead collection part 15 Test water inlet nozzle part 16 Working electrode (gold electrode)
17 Counter electrode 18 Comparative electrode 19 Composite electrode 20 Measuring part 21 Sample water inlet valve 22 Sample water sampling valve 24 Drain joint 25 Nozzle cleaning brush 26 Handle 27 Electrode housing 28 Resistance temperature detector 30 Electrode engaging part

Claims (5)

The bottom of the measurement tank formed in the shape of a bottomed cylinder elongated in the vertical direction is stored in the mortar shape, and the sample water is input from the horizontal direction of the bottom formed in the mortar shape. The working electrode is arranged such that the ceramic beads gathered at the bottom formed in a mortar shape by the input of the water sample from the horizontal direction are faced to the wall surface in the direction opposite to the side to input the water sample. how the increased while rubbing, the working electrode of the residual chlorine analyzer, wherein the mortar-shaped shape was in the bottom to cycle through ceramic beads to collect in that so as to rub the working electrode after Noboru Ue washing.   A measuring tank for storing test water and having a bottomed cylindrical shape elongated in the vertical direction, beads arranged in the measuring tank, a bead collecting part in which the bottom of the measuring tank has a mortar shape, A water sample inlet nozzle for inputting water sample from the horizontal direction to the bead collection unit, a working electrode disposed with the surface of the electrode facing the water sample inlet nozzle, and an upper position of the working electrode A residual chlorine meter comprising: a composite electrode disposed with the counter electrode and the comparison electrode facing each other in the measurement tank.   The residual chlorine meter according to claim 2, wherein a nozzle cleaning means capable of cleaning the inner surface of the nozzle with a nozzle cleaning brush is provided in the water inlet nozzle portion.   The residual chlorine meter according to claim 2, wherein the composite electrode includes a counter electrode formed in a cylindrical shape, a reference electrode provided at a center position of the counter electrode, and a resistance temperature detector provided at an inner position of the reference electrode. .   The residual chlorine meter according to claim 2, wherein the beads are ceramic beads.

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