JPS5850306Y2 - Water quality measuring device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a water quality measuring device in which a detection part is immersed in sample water to measure the quality of water in rivers, lakes, sea areas, sewage, etc. Concerning a measuring device.

pH measurement is performed by placing a pH-responsive glass membrane between liquids with different pH values and measuring the potential difference generated on both sides of the membrane.

Specifically, a comparison is made in which the potential on the inside of the glass membrane is extracted from the internal electrode using a glass electrode with a glass membrane at the tip, an internal electrode sealed inside, and an internal liquid with a certain pH value, and the potential on the outside of the glass membrane is extracted. The electrode is placed in a container containing a saturated KCA solution, and the KCl container is equipped with a pinhole or porous ceramic embedded liquid junction, through which the saturated KC1 solution in the KC1 container is gradually detected. The structure is such that it flows out into the water, and the reference electrode and the sample water are made to have the same electrical potential through the liquid junction.

Therefore, in order to perform correct measurements, it is necessary to keep the glass membrane surface clean and to prevent the liquid junction from becoming clogged.

That is, if the surface of the glass membrane is covered with dirt, oil, etc., the glass membrane and the sample water cannot come into direct contact with each other, making it impossible to accurately measure the U value of the sample water.

Furthermore, if dirt, oil, etc. adhere to the liquid junction, it may cause unstable measurement output and output errors.

By the way, when a solid is placed in a liquid with a flow velocity, a layer with almost no flow velocity (laminar bottom layer) exists very close to the solid surface.

If the liquid contains a sticky substance, the sticky substance tends to adhere to the solid surface within the laminar bottom layer.

Therefore, in a laminar flow, even if the laminar bottom layer is thinned to some extent by increasing the flow rate, the laminar bottom layer cannot be completely eliminated, and sticky dirt etc. in the sample water may be deposited on the glass membrane surface of the pH electrode. It is not possible to completely prevent the liquid from adhering to the liquid junction, causing problems such as inaccurate pH value measurement and fluctuations.

Therefore, various automatic cleaning methods for pH meters have been tried in the past.

(1) Ultrasonic cleaning involves irradiating the electrode with ultrasonic waves of an appropriate frequency, but it is hardly effective when testing water at sewage treatment plants, etc., and there is a risk of damaging the glass membrane if the ultrasonic waves are strong enough. There is.

(2) In water jet cleaning, the force of the water jet is attenuated by water testing, making it difficult to act on the electrode surface and requiring a device to pressurize the water.

(3) Air jet cleaning is a method of blowing away dirt on the electrode surface using high-pressure air, but it requires high-pressure air and
If the pressure becomes too high, the electrodes may be damaged, so air pressure must be controlled.

(4) Brush cleaning is a method of removing dirt by scrubbing the electrode surface with a brush, but it may damage the glass surface if there are many sand particles in the sample, and there is a risk of dirt getting entangled in the brush drive mechanism. There is.

(5) Chemical cleaning is a method of spraying a chemical, detergent, or acid onto the electrode surface to remove dirt, but it requires selecting a chemical suitable for the stain and maintenance for replenishing the chemical.

As mentioned above, conventional cleaning devices have problems in that they fall over, and cannot be used stably in highly contaminated sample water.

In addition, methods other than ultrasonic cleaning cause a large error in the measurement output during cleaning, so if continuous measurement is required, it is necessary to retain the measured value immediately before cleaning only during cleaning, and the pH value of the sample water It is not suitable for measurement when the temperature changes quickly.

In order to solve the problem of the sensitivity deterioration of the pH meter due to the adhesion of dirt, the inventors of the present invention have proposed a water quality measuring device using a bubble cleaning method (Utility Application No. 5348707).

In other words, by using a bubble cleaning device, the frequency of maintenance can be significantly reduced, and since there is no need to hold the indicated value during cleaning, measurement and recording can be continued even when the pH value changes rapidly. It is possible.

On the other hand, a common problem with measuring devices in which the detection end is immersed in the sample water is that if the sample water contains dust in addition to sticky substances, the dust may get entangled with the detection part, interfering with the measurement. Become.

In particular, water samples at sewage treatment plants contain a large amount of hair, rubber, and string-like debris, and entanglement of these debris often poses a problem.

If such contaminants become entangled with the electrodes or near the electrodes, the measured value becomes unstable, and if more contaminants become entangled, the flow of sample water that comes into contact with the electrodes disappears, resulting in erroneous measurements.

Therefore, when measuring sample water that contains dust, a means to prevent dust from getting entangled is required.

In addition to the above-mentioned problems with electrode dirt and dust entanglement, the pH electrode should be removed from the water sample and replaced and calibrated in order to ensure accurate measurements or when abnormal output is detected. There are problems with the handling of the detection unit, etc.

During calibration, the lifted detection electrode is immersed in a solution with a standard pH value to adjust the reading, but in order to perform this work safely and easily, it is desirable that the lifted portion be light.

Furthermore, it is desired that the detection part be held in a structure that allows it to be securely fixed in the sample water during measurement, and that required parts can be removed with simple operations during maintenance.

Furthermore, when the flow of test water is strong, it is desirable to have a structure that allows safe attachment and detachment of the detection section without any danger, and that does not cause vibrations in the electrode portion.

The purpose of this invention is to use a bubble cleaning type water quality measuring device.
To provide a water quality measuring device which prevents interference with measurement due to impurities in sample water getting entangled with a detection part, can securely fix the detection part in measurement sample water, and is easy to maintain.

The present invention consists of a support pipe that is fixed at a water quality measurement position and immersed in water, and has an air blowing hole at the bottom that tapers toward the water surface and has an air blowing hole at the tip that tapers toward the water surface. A fixed guide having a tapered hole in a direction parallel to the support pipe, and a pipe-shaped hollow member that can accommodate a measuring member therethrough, and a tip having a protrusion that engages with the guide when the installation is completed. The guide has a detection end that is inserted into the tapered hole of the guide and immersed in the test water, and a casing that surrounds the detection end and has a test water inflow window, and that is fitted into the air blowing part, and has an upper end portion. A configuration including a pipe-shaped detection part fixed to a support pipe, and a protection tube fixed to the support pipe and covering the periphery of the side part of the detection end,
To install or remove the detection part, insert it through the guide, immerse the tip of the detection end in the sample water, pull it out, and fix it with a fixing metal fitting.The detection end should fit its casing to the air ridge part of the support pipe. It is something that makes you

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and p
This is the case when applied to the H meter.

A holding fitting 3 is fixed to a quay 2 of a water test 1 such as a river, a lake, or a lower drainage tank by an anchor bolt 4.

A supporting vibro is fixed to the holding fitting 3 with a U bolt 5.

The supporting vibro is equipped with a connecting fitting 8 for connecting the air tube T at the upper end, a fixing fitting 9 near the upper end, a guide 10 slightly above the water surface, and a protective tube 11 and an air blowing part 1 at the lower end.
2 is fixed.

The protection tube 11 covers the side of the detection end of the detection section 13 to prevent dust from getting entangled with the detection electrode.

The detection unit 13 includes a KCl tank 14, an upper cap 15 of the tank 14, a cable 16 for transmitting a measurement signal to an amplifier (not shown), etc., and a PT-I detection electrode 17 at the lower end.
, a casing 18, and is mounted by fitting the sleeve 19 and the guide 10, fitting the casing 18 and the air blowing part 12, and fixing with the fixing metal fitting 9.

FIGS. 2 to 11 are diagrams for explaining the configuration of each part in FIG. 1 and their functions, which will be explained below.

FIG. 2 shows a sectional view of the lower end of the detection unit 13, and FIG. 3 shows a partially cutaway perspective view.

At the tip of the pH detection electrode 17, there is a p for testing the pH value.
It has an H-responsive glass film 171, and a liquid junction 172 is provided near it.

Saturation KCJ from this liquid junction 172? The solution will slowly flow out.

In addition, the inside of the KC7 tank 14 is filled with a saturated KC4 solution 161, and the amount of saturated KCA that has flowed out from inside the electrode is
The solution is replenished through the replenishment port 173.

The protection tube 11 is fixed to the lower end of the supporting vibro with screws 111.

During cleaning, air is sent into the support vibro through the air tube 7 shown in FIG.

The air passes through the interior 121 of the air blowing section 12, becomes bubbles from the air blowing nozzle 122, passes near the pH electrode 17, and rises.

At that time, the surface of the pH electrode 1T is bubble-cleaned.

The casing 18 is provided with a window, and the inner upper part 18
The part 3 is tapered so that air bubbles can clean the electrode surface smoothly.

The upper part 123 of the air blowing part 12 is tapered, and when the casing 18 and pH detection electrode 17 are lowered from above, the lower end 182 of the casing 18 first hits the tapered part 123 of the air blowing part. Further, by lowering the casing 18, the casing 18 and the pH electrode 17 are set at a convenient position for measurement and bubble cleaning at a portion 124 of the air blowing portion.

FIG. 4 shows a sectional view of the guide 10, and FIG. 5 shows a perspective view.

A sleeve 19 is fixed to the KCl tank 14 with a set screw 191.

A guide 10 is fixed to the support vibro with screws 101.

The inner circumference 102 of the guide 10 is inserted with an appropriate clearance from the outer circumference 192 of the sleeve 19.

Further, the inner circumference 102 of the guide 10 is wider than the outer diameter of the casing 18.

103° 104 portion of guide 10 and sleeve 19
The portions 193 and 194 are tapered to facilitate passage of the casing 18.

FIG. 6 is a side view of the fixture 9 and fixture seat 91 in a combined state, and FIG. 7 is a plan view thereof.

FIG. 8 shows a perspective view of the fixture, and FIG. 9 shows a perspective view of the fixture receiver.

The fixing fitting 9 is fixed to the supporting vibro with a push screw 98, and a plate spring 9 with suitable springiness is attached to the upper surface of the fixing fitting 9.
3-a.

One end of the leaf spring 93-b is fixed by screws 92a, 92b, and the other end of the leaf spring 93-b is a protrusion 95. and a lever 94 are provided.

When the detection unit is set, the protrusion 95 fits into the groove 96 of the fixing metal seat 91, and the protrusion 95 is easily removed by the vibration of the KCl tank 16 due to the force of the leaf springs 93a, t, and 93b. The structure is such that there is no problem.

10 and 11 show a method for removing the detection section.

When lever 94 is pushed in the direction of arrow A in FIG.
comes off from groove 95.

In this state, by twisting the detection part in the direction of arrow B in FIG. 11, the detection part can be pulled up as it is.

According to this embodiment, the protection tube can prevent dust from getting entangled with the detection unit during the test water.

Debris in the test water will get tangled if there is a protrusion on the detection part, and the dirt will become tangled with that dirt, but the protective tube prevents the flow of the test water from directly hitting the detection part, so there is no chance of dirt getting tangled in the detection part. There isn't.

In addition, since the protective tube surrounds the detection unit and support pipe, it has the effect of preventing dust from getting entangled in any horizontal direction, eliminating the need to consider the direction of flow during installation. It is also effective when there are changes in the direction of flow, such as in rivers.

Furthermore, when performing maintenance on the detection electrode, it is only necessary to pull up the detection section.

To pull up the detection part, first push the lever 95 of the fixture 9 in the direction of the arrow A shown in Figure 10, rotate the detection part in the direction B in Figure 11, and then just pull up the detection part. .

When being pulled up, the casing 18 passes through the guide 10, but since the upper end 184 of the casing and the guide inner surface 104 are tapered, it can be pulled out easily.

Furthermore, even when the detection section is long to some extent and the flow of the test water is strong, the detection section can be safely and reliably set in the test water.

That is, since the KCl tank is made of transparent vinyl chloride to make it easier to observe the amount of saturated K(J? bath solution inside), it may bend under the force of the flow.

In addition, if the entire length of the detection part is long and one end receives the force of the test water flow, a strong force will be required to support it only at the upper end, but with this device, when setting the detection part, first insert the casing 18 at the lower end of the detection part. Pass it through guide 10.

The inner surface 103 of the guide 10 is tapered, and the detection part is not yet in contact with the sample water at this point, so even if the flow is strong, it can easily pass through without being affected by it.

As the detection unit is lowered, the casing comes into contact with the test water and receives the force of the test water flow. At this point, the KCJ' tank is supported by the guide, so just hold the top of the KCl tank lightly. good.

When the detection part is further lowered, the lower end of the casing 182 hits the tapered part 123 of the air blowing part, and finally hits the part 124, making the casing stable.

At this time, the sleeve attached to the KCA tank is on the inner surface of the guide and prevents the KCA tank from vibrating due to the flow.

Next, twist the detection part so that the protrusion 96 fits into the groove in the fixing metal seat, and set it using the lever 94, thereby fixing the entire detection part.

In other words, when a part of the detection part is immersed in the sample water, the guide is always receiving the force, so there is no need to support the moment due to the force of the flow only at the upper end, and therefore no unreasonable force is required. , you can work safely.

In this way, no tools are required to attach or detach the detection part, and the work can be done entirely with bare hands.

Additionally, there are no small parts that could be dropped or lost during testing if removed.

FIG. 12 shows another embodiment of the present invention, and the difference between this figure and FIG. 1 lies in that the upper part of the protective tube 11 is made to protrude above the water surface.

This structure is applied when the flow of test water is particularly strong and it is sufficient to replace the test water from the bottom side of the protection tube 11, and since the top end of the protection tube 11 is above the water surface, it prevents dirt from getting entangled. At the same time, the strong water pressure applied to the lower end of the detection unit when the detection unit 16 is attached and detached can be weakened, making the attachment and detachment work safer.

In addition, although the case of a pH meter was shown in the example, the present invention is not limited to this, and can be applied to a water quality measuring device in which the detection end is immersed in the test water, such as a Do meter, an ORP meter, and a conductivity meter. , the same effect can be obtained by applying it to various ion concentration meters, etc.

As described above in detail, the water quality measuring device according to the present invention can remove dirt from the water quality detection section and prevent dirt from getting entangled therein.

Further, it has the effect of securely fixing the detection section and making it easy and safe to attach and detach.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the water quality measuring device according to the present invention, FIGS. 2 to 11 are diagrams showing the configuration of each part of FIG. 1, and FIG. 12 is a diagram showing another embodiment of the present invention. FIG. 6...Support pipe, I...Air tube, 6...Connection fittings, 9...Fixing fittings, 10...Guide, 11 ...protection tube,
12... Air blowing section, 13... Verification section, 14... KCl tank, 16... Cable, 17... pH detection electrode , 18...
...Casing, 19...Sleeve.

Claims (1)

[Scope of utility model registration request] A support pipe that is fixed at the water quality measurement position and immersed in the water being tested has an air blowing part with an air blowing hole at the tapered tip toward the water surface at the bottom, and a support pipe that is fixed to the support pipe slightly above the water surface. The guide has a tapered hole in a direction parallel to the support pipe, and the hollow member has a pipe-like shape that allows the measurement member to be inserted into the guide. It has a detection end that is inserted into the tapered hole of the guide and immersed in the test water, a test water inflow window surrounding the detection end, a casing that is fitted into the air blowing part, and a support pipe at the upper end. A water quality measuring device comprising: a fixed detection section; and a protection tube fixed to the support pipe and covering the periphery of the side part of the detection end.