JPH0617070Y2 - Ion densitometer using multiple electrodes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION {Industrial application field} The present invention relates to an ion concentration meter used for measuring the ion concentration of industrial wastewater and other solutions.

{Prior Art} As an immersion type ion densitometer for measuring the ion concentration of a solution, for example, the one shown in FIG. 3 is known.

In FIG. 3, 41 is a holder made of a plastic or metal pipe, 42 is an electrode attached to the end of the holder 41, 43 is a cleaning cylinder into which the holder 41 is inserted, and 44 is a cleaning cylinder. It is a liquid passage hole formed in 43.

45 is a nozzle attached to the end of the cleaning cylinder 44 facing the end of the electrode 42, and the pipe 46 connected to this is a three-way switching valve 47.
It is connected to the. Reference numeral 48 is a chemical liquid container such as a cleaning liquid, and a hermetically sealed pressure-feeding container 49 is inserted therein. 50 is a pressure vessel
The check valve provided at the bottom of 49 allows the chemical liquid in the chemical liquid container 48 to flow into the pressure-feeding container 49, and prevents the chemical liquid in the pressure-feeding container 49 from flowing out.

Reference numeral 51 is a pipe having an end portion inserted into the pressure-feeding container 49 up to near the bottom thereof, which is connected to the three-way switching valve 47.
The pipe 52 branched by the three-way switching valve 47 is connected to an air supply source 53 such as an air pump. Reference numeral 54 is an air supply pipe branched from the pipe 52 and shallowly inserted into the pressure-feeding container 49. Reference numeral 55 is a three-way switching valve connected to the air supply pipe 53.

This ion densitometer is used by inserting the electrode 42 into the test liquid. And when measuring the ion concentration,
Closes the pipe 51 side of the three-way switching valve 47 and
55 is closed and the air supply source 53 is driven to leak air little by little from the nozzle 45 to accelerate the replacement of the test liquid and prevent the nozzle 45 from being clogged.

When cleaning the electrode 42 because it is dirty, the pipe 52 side of the three-way switching valve 47 is closed, the switching valve 55 is opened, the air supply source 53 is driven, and the air supply pipe 54 is used to pressurize the container 49. Supply air to the inside. With this air pressure, pipe the chemical solution in the pressure-feeding container 49
The nozzles 1 and 46 supply the nozzle 45 and spray the electrode 42.

{Problems to be Solved by the Invention} In the conventional ion concentration meter, the ion concentration measurement and the cleaning are sequentially performed, but the ion concentration value often changes suddenly when the electrode 42 is cleaned. Therefore, it has been necessary to hold a measurement value immediately before cleaning or to provide a temporary value within the pH adjustment range to cover a temporary missing measurement.

Also, depending on the setting of the cleaning cycle and the load of dirt on the electrodes,
There is a problem that the response of the electrode does not follow up, and an accurate instruction cannot be guaranteed.

The present invention is to solve the above problems,
The purpose of the present invention is to obtain an ion densitometer capable of continuous measurement and easy cleaning of electrodes.

{Means for Solving the Problems} The ion concentration meter of the present invention has a plurality of washing cylinders,
A holder having an electrode attached to an end thereof is slidably inserted so as to move the electrode in and out of the cleaning cylinder, and a driving means for sliding the holder is provided, and the end of the electrode-side cleaning cylinder is provided. Sealing means is provided on the inner peripheral surface of the section,
A pair of seal portions, which are sealed by the sealing means when the electrode comes out of the cleaning cylinder and when the electrode enters the cleaning cylinder, are formed in each holder, and the sealing means and each sealing portion are formed. Is used to seal the end portion of each cleaning cylinder so that the inside of each cleaning cylinder can be used as a container for a chemical liquid for cleaning or the like.

As the driving means, an arbitrary structure such as an air cylinder or a screw shaft can be used.

{Action} This ion densitometer is used by attaching it to the measurement site with the washing cylinder standing upright. When measuring the ion concentration, the holder is slid by the driving means so that the electrode at the tip of the holder is projected from the washing cylinder and brought into contact with the test liquid.

For example, a plurality of holders are alternately slid at appropriate time intervals, the ion concentration is measured with an electrode protruding outside the cleaning cylinder, and the electrode inside the cleaning cylinder is a chemical solution injected into the cleaning cylinder. Wash.

Alternatively, one of the electrodes is projected out of the washing cylinder to measure the ion concentration, and the other electrode is placed in the washing cylinder and immersed in the chemical solution, and this electrode is sometimes sequentially or arbitrarily. Cross-check is performed by projecting from the washing cylinder and used for measuring the ion concentration.

Further, all electrodes are projected out of the washing cylinder to measure the ion concentration, and the indicated values of each electrode are compared or averaged to confirm the accuracy of the measured values and continue the measurement. Then, the holders are appropriately slid alternately to position the electrode in the cleaning cylinder and cleaning is performed with the chemical solution.

{Example} An example of the ion concentration meter of the present invention will be described with reference to FIG.

In FIG. 1, 1a and 1b are holders made of pipes, and 2a and 2b are holders 1a and 1b with their tips protruding from the lower ends of the holders 1a and 1b.
Electrodes 3a and 3b mounted in 1b are protection pipes provided at the tips of the holders 1a and 1b in order to protect the electrodes 2a and 2b, and the tips of the protection pipes 3a and 3b are closed. Is
And the liquid passage holes 4a and 4b through which the test liquid flows in the middle portion in the length direction.
Is provided, and the base portions and the tip portions of the protection pipes 3a and 3b are seal portions 5a, 5b, 6a and 6b, respectively.

7a and 7b are cleaning cylinders into which the holders 1a and 1b are inserted, and the protection pipes 3a and 3b are slidably supported by support portions 8a and 8b formed at the lower end of the cleaning pipes and having a slightly smaller diameter. ，
O-ring 9 as a sealing means arranged on the inner peripheral surface of 8b
The lower ends of the cleaning cylinders 7a and 7b can be sealed by a and 9b and the seal portions 5a, 5b, 6a and 6b, respectively. Reference numerals 10a and 10b are brackets fixed to the upper ends of the holders 1a and 1b, and 11a and 11b are chemical liquids contained in the cleaning tubes 7a and 7b for cleaning the electrodes 2a and 2b.

Reference numeral 12 is a mounting member fixed to the upper ends of the cleaning cylinders 7a and 7b, and air cylinders 13a and 13b vertically mounted above the mounting members.
Rods 14a, 14b are attached to the brackets 10a, 10b.

Therefore, the operation of the air cylinders 13a, 13b causes the holders 1a,
When 1b slides up and down and holders 1a and 1b descend, seal portions 5a and 6a contact O-rings 9a and 9b, and when holders 1a and 1b rise, seal portions 5b and 6b form O-rings. 9a,
The lower ends of the cleaning cylinders 7a and 7b are sealed by contacting 9b.

16 is a chemical liquid container such as a cleaning liquid, and a sealed pressure container
17 is inserted. Reference numeral 18 denotes a check valve provided at the bottom of the pressure-feeding container 17, which allows the drug solution in the drug-solution container 16 to be supplied to the pressure-feeding container 17 and prevents the drug solution in the pressure-feeding container 17 from flowing out.

Reference numeral 19 denotes a pipe having an end portion inserted into the pressure-feeding container 17 up to near the bottom thereof, which is connected to the three-way switching valve 20. A pipe 21 connected to the three-way switching valve 20 is connected to an air supply source 22 such as an air pump. Reference numeral 23 is an air supply pipe branched from the pipe 21 and shallowly inserted into the pressure feeding container 17, and 24 is a three-way switching valve connected to the air supply pipe 23.

Reference numeral 25 is a pipe connected to the three-way switching valve 20 and the other end is connected to the lower portion in the cleaning cylinder 7a. A switching valve 26 is connected to the pipe 25. 27 is an upstream side of the switching valve 26, which is a pipe branched from the pipe 25 and connected to the lower part of the cleaning cylinder 7b.
28 are provided.

The ion concentration meter configured as described above is used in a state in which the mounting member 12 fixes the measurement position and the lower portions of the cleaning cylinders 7a and 7b are inserted into the test liquid.

FIG. 1 shows a state where the electrode 2a measures the ion concentration and the electrode 2b is washed.

That is, turn on the rod 14a of the air cylinder 13a,
The holder 1a is lowered so that the electrode 2a is projected from the cleaning cylinder 7a. At this time, since the support portion 8a of the washing cylinder 7a is sealed by the O-ring 9a and the seal portion 5a, the test liquid does not flow into the washing cylinder 7a.

When cleaning the electrode 2a, the rod 14a of the air cylinder 13a is set to "out" to position the electrode 2a in the cleaning cylinder 7a, and the supporting portion 8a of the cleaning cylinder 7a is connected to the O-ring 9a and the seal portion 5b. Seal with.

On the other hand, since the rod 14b of the air cylinder 13b is "extended" to raise the holder 1b, the electrode 2b is located inside the cleaning cylinder 7b, and the supporting portion 8b of the cleaning cylinder 7b is connected to the O-ring 9b. It is sealed with the seal portion 6b. Then, the cleaning chemical liquid 11b is injected into the cleaning cylinder 7b to clean the electrode 2b.

The injection of the chemical liquid 11b into the cleaning cylinder 7b is performed by the three-way switching valve 20.
The pipe 21 side of is closed and the pipe 19 side is opened. And the switching valve
26 is closed, the switching valves 24 and 28 are opened, the air supply source 22 is driven, and air is supplied to the pressure-feeding container 17 through the air supply pipe 23. Then, the chemical liquid in the pressure-feeding container 17 is injected into the cleaning cylinder 7b via the pipes 19 and 27 by the pressure of air.

In order to measure the ion concentration of the electrode 2b washed in this way, when the holder 1b is moved downward by driving the air cylinder 13b to project the electrode 2b out of the washing cylinder 7b, the liquid passage hole 4b of the protective pipe 3b of the protection pipe 3b is removed. Therefore, since the chemical solution flows out of the cleaning cylinder 7b,
Next, when cleaning the electrode 2b, the chemical liquid in the pressure-feeding container 17 is supplied to the cleaning cylinder 7b as described above.

The injection of the chemical liquid into the cleaning cylinder 7a is performed by closing the switching valve 28, opening the switching valve 26, and driving the air supply source 22.

In this embodiment, the air supply source 22 is connected to the pipe 21 by the three-way switching valve 20.
Connected to. Therefore, the pipe 21 side of the three-way switching valve 20 is opened, the pipe 19 side is closed, and the switching valve 28 is opened.
Close 26. Then, when the air supply source 22 is driven, air is jetted into the chemical liquid in the cleaning cylinder 7b through the pipe 27 to stir the chemical liquid, so that the cleaning effect of the electrode 2b can be further improved.

When the chemicals 11a and 11b in the cleaning cylinders 7a and 7b are not agitated, it is not necessary to provide the three-way switching valve 20 and the pipe 21. In this case, the pipes 25 and 27 can be arranged at arbitrary positions in the cleaning cylinders 7a and 7b, and the pipes 25 and 27 can be arranged in the cleaning cylinders.
It is also possible to insert from the top of 7a, 7b to the bottom.

The means for injecting the chemical into the cleaning cylinders 7a, 7b is arbitrary,
A washing cylinder without providing the chemical solution container 16 and the pressure-feeding container 17
It is also possible to provide a chemical solution injection hole in 7a and 7b and directly inject the chemical solution contained in the container.

As described above, in this ion concentration meter, since the electrodes 2a and 2b are slidably inserted into the cleaning cylinders 7a and 7b, respectively, the electrodes 2a and 2b are appropriately used for measuring the ion concentration. Therefore, it is possible to continuously obtain highly reliable indication values.

FIG. 2 shows another embodiment.

In the ion densitometer of this embodiment, holders 1a and 1b having electrodes 2a and 2b projecting from the ends and attached are slidably inserted into washing cylinders 7a and 7b.

The pipe 32 connected to the chemical tank 31 for cleaning or the like with the switching valve 33 interposed is connected to the three-way switching valve 34. 35a and 35b are liquid feed pipes connected to the three-way switching valve 34,
The other ends of these are inserted into the cleaning cylinders 7a and 7b to the bottom thereof so that the chemicals can be injected into the cleaning cylinders 7a and 7b and the chemicals can be sucked up. 36 is a suction pump for sucking the chemical liquid in the cleaning cylinders 7a and 7b into the tank 31, 37 is a switching valve, and 38 is an opening / closing valve for discharging the chemical liquid in the tank 31.

The other structure is similar to that of the embodiment shown in FIG. 1, and therefore detailed description thereof is omitted and the same reference numerals are given.

This ion densitometer uses the cleaning cylinder 7a, 2b when the electrodes 2a, 2b are projected from the cleaning cylinder 7a, 7b or housed in the cleaning cylinder 7a, 7b.
This is suitable when it is necessary to prevent the drug solution in a and 7b from flowing out and mixing into the test solution.

That is, like the electrode 2b, when it is positioned in the cleaning cylinder 7b for cleaning, the switching valve 33 is opened, and the liquid delivery pipe 35b side of the three-way switching valve 34 is opened to clean the chemical solution in the tank 31. Tube 7b
Put in.

Then, before the electrode 2b is projected to the outside of the cleaning cylinder 7b, the suction pump 36 is driven to suck the chemical liquid in the cleaning cylinder 7b into the tank 31. After the suction of the chemical liquid is completed, the holder 1b is lowered. Therefore, it is possible to prevent the chemical solution from mixing with the test solution.

The chemical solution sucked into the tank 31 may be used repeatedly for a suitable number of times, and then replaced with a new chemical solution, or a new chemical solution may be replaced each time it is used. Further, the chemical liquid supply device of the embodiment shown in FIG. 1 can be used in combination.

{Effect of the Invention} As described above, the ion concentration meter of the present invention selects the plurality of electrodes by slidably inserting the holder having the electrodes attached to the ends into each of the plurality of washing cylinders. It was possible to use it for the purpose of measuring the ion concentration, and it was possible to immerse the electrode not used for the measurement in a chemical solution such as cleaning in the cleaning cylinder.

Therefore, by appropriately using a plurality of electrodes, it is possible to perform continuous measurement, it is possible to easily and accurately determine the time of cleaning the electrodes, and the electrodes can be sufficiently cleaned. The maintenance cycle can be extended.

For example, it is possible to alternately use one of the plurality of electrodes for measurement and wash the other electrode in the washing cylinder. By using a plurality of electrodes in this way, continuous measurement is possible, and the contamination of the electrodes can be constantly reduced to maintain a state in which there is almost no effect on the measurement.

It is also possible to continue the measurement with one of the electrodes and use the other electrode for the measurement as appropriate to perform the cross check, and to obtain a highly reliable indication value, and to perform the measurement. The time when the used electrode is cleaned can be accurately determined.

Furthermore, it is possible to use a plurality of electrodes for measurement at the same time, and to perform cleaning, etc., one by one as appropriate. In this case, it is possible to perform measurement continuously while comparing a plurality of support values. The measurement accuracy can be improved, the determination at the time of cleaning each electrode is easy, and the maintenance cycle can be extended.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view of another embodiment, and FIG. 3 is a sectional view of a conventional example. 1a, 1b: holder, 2a, 2b: electrode, 3a, 3b: protective pipe,
5a, 5b, 6a, 6b: Seal part, 7a, 7b: Washing cylinder, 9a, 9b:
O-rings, 11a, 11b: chemical liquids, 13a, 13b: air cylinders.

Claims (1)

[Scope of utility model registration request] 1. A holder for attaching an electrode to an end of each of a plurality of cleaning cylinders is slidably inserted so as to move the electrode in and out of the cleaning cylinder, and a drive for sliding the holder. And a sealing means is provided on the inner peripheral surface of the end of the cleaning cylinder on the side of the electrode, when the electrode comes out of the cleaning cylinder and when it enters the cleaning cylinder.
A pair of seal parts to be sealed by the sealing means is formed in each holder, and the end of each cleaning cylinder is sealed by the sealing means and each seal part to clean the inside of each cleaning cylinder with a chemical solution. An ion densitometer using a plurality of electrodes configured so that it can be used as a housing part.