JP2007171119A - Sensor for detecting concentration of aqueous ozone solution - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-reliability sensor capable of quickly tracking changes in the concentration of ozone, even in a stationary aqueous ozone solution or in the aqueous ozone solution with variable flow velocity, to surely detect the concentration of the aqueous ozone solution. <P>SOLUTION: This sensor 100 for detecting the concentration of the aqueous ozone solution is provided with a piece-shaped body 2, a detection electrode 3 and a comparison electrode 4 provided in a lower part of the piece like body 2, a pivot 5 provided in an upper part of the piece like body 2 to make the lower part of the piece like body 2 movable, and an oscillator 6 provided in the piece like body 2 to vibrate the piece-shaped body 2. An electrical signal proportional to the ozone concentration in the aqueous ozone solution is obtained, based on an electromotive force generated by immersing the detecting electrode 3 and the comparison electrode 4 into the aqueous ozone solution. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ozone water concentration detection sensor that detects an ozone concentration in ozone water.

Ozone water has been recognized for its contribution in many fields, such as its bactericidal and deodorizing properties, as well as its activity on cells, and gaseous ozone has no effect on the respiratory tract. Widely used in the field. However, since the concentration of ozone water attenuates in a short time, there is a strong demand for indication and confirmation of the concentration at the site of use. Conventionally, as the concentration calibration method for ozone water, the titration method that looks at the color change of a test reagent such as potassium iodide has been the mainstream, but it requires chemicals and a precision pipette, and can be used in the laboratory. However, it was cumbersome and could not be put into practical use at a general ozone water use site. For this reason, the UV method for examining the ultraviolet absorption rate of ozone water and the polarographic method using an ozone permeable membrane are also used, but both have advantages and disadvantages, and it is difficult to know the ozone concentration easily and instantaneously. It was.
Therefore, the inventors have devised an electrode method for easily converting the ozone water concentration into an electric signal and put it into practical use. In this electrode method, a first electrode and a second electrode are immersed in a flowing ozone water stream, the first electrode is composed of metallic silver coated with metallic silver or silver chloride, and the second electrode is formed on the surface. A voltage change following a change in the concentration of ozone water generated between the first electrode and the second electrode is detected (see, for example, Patent Document 1). .
JP-A-8-136501

However, in the above electrode method, if the electrode is immersed in ozone water having a flow velocity and the relative velocity between the electrode and the flowing ozone water flow is not appropriate, it is difficult to detect an accurate ozone water concentration. It was not possible to measure the ozone concentration of ozone water or the ozone concentration of ozone water with varying flow rates.
The present invention has been made in view of the above circumstances, and provides a highly reliable ozone water concentration detection sensor that quickly follows changes in ozone concentration even in stationary ozone water or ozone water whose flow rate changes. The purpose is that.

In order to solve the above problems, the invention of claim 1 is, for example, as shown in FIG.
Piece 2 and
A detection electrode 3 and a comparison electrode 4 provided in a lower portion of the piece-like body;
A bearing (for example, pivot 5) that supports the lower part of the piece to be movable at the upper part of the piece,
A vibrator 6 that is provided on the piece and vibrates the piece,
An electrical signal proportional to the ozone concentration of ozone water is obtained from an electromotive force generated by immersing the detection electrode and the comparison electrode in ozone water.

  According to the first aspect of the present invention, the detection electrode and the reference electrode immersed in the ozone water are constantly displaced and vibrated by vibrating the piece-like body at a constant frequency by the vibrator, and the ozone water and the electrode are oscillated. Continuous displacement contact can occur. Therefore, it is possible to take out a more stable electric signal than before, and to follow the change of the ozone concentration quickly and measure the ozone concentration very accurately even in the stationary ozone water or the ozone water whose flow rate changes. it can.

The invention of claim 2 is an ozone water concentration detection sensor 100 according to claim 1, for example, as shown in FIG.
The piece-like body is made of ceramic.

  According to the invention of claim 2, since the flake is made of ceramic, it is excellent in ozone resistance compared to the case of using a metal, and oxidation by ozone can be prevented. Further, it is rich in elasticity, and vibrations from the vibrator are easily transmitted, so that the performance as a sensor can be improved.

The invention of claim 3 is the ozone water concentration detection sensor according to claim 1 or 2, for example, as shown in FIG.
The thickness of the piece is 0.5 to 1.0 mm.

  According to invention of Claim 3, since the thickness of a piece-like body is as thin as 05-1.0 mm, it is rich in elasticity, the vibration by a vibrator | oscillator is transmitted easily, and it leads to the performance improvement as a sensor.

As for invention of Claim 4, as shown in FIG. 3, in the ozone water concentration detection sensor 100B as described in any one of Claims 1-3,
The piece-like body is provided with a correction electrode 13B for correcting an electric signal generated by the ozone concentration of ozone water.

  According to the invention of claim 4, since the correction electrode is provided on the piece-like body, the electric signal generated by the ozone concentration is corrected by the correction electrode, and a higher-performance ozone water concentration detection sensor can be obtained. it can.

As for invention of Claim 5, as shown in FIG. 1, in the ozone water concentration detection sensor as described in any one of Claims 1-4,
The detection electrode is a metal coated with gold or platinum;
The reference electrode is a metal having a silver surface coated with silver chloride.

  According to the invention of claim 5, since the detection electrode is a metal coated with gold or platinum and the comparison electrode is a metal coated with silver chloride on the surface of silver, the change in the ozone concentration of ozone water is quickly followed. And a highly reliable ozone water concentration detection sensor.

  According to the present invention, since the vibrator is provided on the piece-like body, continuous displacement contact between the ozone water and the electrode can be caused by vibrating the piece-like body by the vibrator. An electric signal can be stably obtained even in water or in ozone water whose flow rate changes, and a change in the ozone water concentration can be followed quickly, and an ozone water concentration detection sensor that is extremely accurate and reliable can be obtained.

Hereinafter, first to third embodiments of the present invention will be described with reference to the drawings.
[First embodiment]
FIG. 1A is a side view schematically showing an ozone water concentration detection sensor 100 according to the first embodiment of the present invention, and FIG. 1B is a main part of the ozone water concentration detection sensor 100 in FIG. It is the front view which showed.
The ozone water concentration detection sensor 100 is a sensor that detects the ozone concentration of ozone water filled in the water tank 1, and is a piece 2 formed in a ceramic strip shape and a lower end portion of the piece 2. Are provided so as to be parallel to each other, support the detection electrode 3 immersed in ozone water, the reference electrode 4 serving as a reference for potential measurement, and the upper end of the piece 2, and the lower end of the piece 2 A bearing that is movable and a vibrator 6 that is provided at the upper end of the piece 2 and vibrates the piece 2 are provided.

  As a material of the piece-like body 2, alumina ceramic is preferable, and the thickness is preferably 0.5 to 1.0 mm. Thus, by forming the piece-like body 2 to be thin, the transmission of vibrations by a vibrator 6 described later becomes good. Further, an insertion hole 21 into which a distal end 51 of a pivot 5 described later is inserted is formed in the upper end portion of the piece-like body 2 so as to penetrate in the thickness direction.

Examples of the detection electrode 3 include platinum and gold that can quickly follow changes in ozone concentration, nickel-chromium alloy having an ozone oxide film formed on the surface, and palladium (for example, 0.5% to 5%). It is preferable to use an electrode made of nickel / chromium / palladium alloy or the like which contains an ozone oxide film on the surface. In particular, the nickel-chromium alloy can be suitably used at a relatively low concentration, for example, in the range of 0 to 5 ppm, and the nickel-chromium-palladium alloy can be used at a higher concentration range. preferable.
As the reference electrode 4, it is preferable to use an electrode having a silver surface coated with silver chloride. As the detection electrode 3 and the comparison electrode 4, those in which various metals are linearly formed can be used.
Further, one end of the detection electrode 3 is connected to the positive electrode of the ammeter 7, and one end of the comparison electrode 4 is connected to the negative electrode of the ammeter 7. As the ammeter 7, a microampere ammeter can be used.

As the vibrator 6, a low power consumption coin-type vibration motor (unbalanced rotation motor) used for detecting an incoming call of a mobile phone or the like can be used.
As the bearing, the pivot 5 can be used. For example, a pivot having a substantially mountain shape in a side view with a sharp tip 51 can be cited. Such a pivot 5 is attached to a bearing body 8 having a substantially U-shaped side view in section, which has a recess 81 into which the upper end portion of the piece-like body 2 is inserted. Attached to opposing wall surfaces 81a and 81a. And the front-end | tip 51 of the pivot 5 is each inserted in the insertion hole 21 of the piece-like body 2 from the front and back of the piece-like body 2, and the upper end part of the piece-like body 2 is clamped by this, and the lower end part of the piece-like body 2 Is supported movably.

  The ozone water concentration detection sensor 100 having the above configuration is immersed in the ozone water in the water tank 1 so that the lower part of the piece 2 is brought into contact with the detection electrode 3 and the comparison electrode 4. Next, by driving the vibrator 6, the piece-like body 2 is constantly displaced, and a continuous displacement contact is given between the detection electrode 3 and the comparison electrode 4 and the ozone water. As a result, an electromotive force is generated, and a stable electric signal having a strength proportional to the ozone concentration of ozone water can be obtained.

As described above, according to the embodiment of the present invention, since the vibrator 6 is provided in the ceramic piece 2, the vibrator 6 vibrates the piece 2 at a constant frequency, and thereby the ozone. Since the detection electrode 3 and the comparison electrode 4 immersed in water can constantly oscillate and vibrate, it is possible to cause continuous displacement contact between the ozone water and the electrodes 3, 4. In particular, an electric signal can be stably obtained, and the ozone concentration of ozone water can be measured very accurately.
Moreover, the ozone water concentration detection sensor 100 is provided with the detection electrode 3 and the comparison electrode 4 at the lower end of the piece 2, and the upper end of the piece 2 is suspended by the pivot 5 and the vibrator 6 is provided. Since it has a simple structure, it is easy to manufacture and can also perform measurement automatically and is excellent in terms of operation.
Furthermore, since the piece-like body 2 is made of a thin ceramic, it is superior in ozone resistance compared to the case of using a metal, and can be prevented from being oxidized by ozone. Moreover, it is rich in elasticity, and vibrations from the vibrator 6 are easily transmitted, so that the performance as a sensor can be improved.

Next, the effect of the ozone water concentration detection sensor 100 of the present invention will be described with reference to examples.
[Example]
For the piece 2, a 0.6% thick 98% alumina ceramic thin plate is laser-cut to a width of 10 mm and a length of 100 mm, and a pivot insertion hole 21 (diameter 3 mm) is formed at the upper end of the piece 2. The piece 2 was suspended through the pivot 5 in the insertion hole 21. As the detection electrode 3 provided at the lower end of the piece 2, a gold wire having a length of 10 mm and a diameter of 1 mm is used, and the surface of a pure silver wire having the same size is coated with silver chloride as the comparison electrode 4. did. Then, the detection electrode 3 and the comparison electrode 4 were connected to the outside of the system by an insulated wire, and connected to an ammeter 7 of 0 to 100 amps.
As the vibrator 6, a coin-type vibration motor of about 12000 RPM was selected and used, and the piece 2 was vibrated at about 200 cycles / second. Here, even if a normal electromagnetic vibrator was connected to the tip of a rod-shaped transmitter like a brush handle, it was difficult to give a uniform vibration displacement to the tip. By using a thin ceramic thin plate made of ozone-resistant elastic material and applying a vibration displacement in one direction, a constant displacement of about 2 mm width can be given to the detection electrode 3 and the comparison electrode 4. Continuous displacement contact could be made between the electrodes. As a result, an electric signal of about 20 microvolts per 1 ppm was obtained between the electrodes 3 and 4, and a stable electric signal could be extracted.

[Second Embodiment]
FIG. 2 is a side view schematically showing an ozone water concentration detection sensor 100A in the second embodiment.
The ozone water concentration detection sensor 100A of the second embodiment is an application example in which the ozone water concentration detection sensor 100 of the first embodiment is more simple and portable.
Specifically, a packing material 5 </ b> A such as silicon rubber or resin is used as a bearing instead of the pivot 5. By using the packing material 5A in this way, the piece 2A can be held soft, and there is no need to form a pivot insertion hole in the upper end of the piece 2A.
As in the first embodiment, the packing material 5A is attached to a bearing body 8A having a substantially U shape in a side sectional view, and the front and back surfaces of the piece 2A are inserted between the packing materials 5A and 5A. Thus, the upper end portion of the piece-like body 2A is held.
Also, a concentration indicator 9A is attached to the bearing body 8A. The concentration indicator 9A is instructed so that the measured value of an ammeter (not shown) connected to one end of the detection electrode 3A and the comparison electrode 4A matches the concentration of ozone water. It has been. A dry cell storage unit 10A is formed below the concentration indicator 9A, and two dry cells 101A and 101A serving as a power source for the vibrator 6 are stored in the dry cell storage unit 10A. A power button 11A for starting or stopping the vibrator 6A is provided below the dry cell storage unit 10A. Further, a shielding cover 12A is provided at the lower end of the bearing body 8A so as to cover the vibrator 6A and the packing material 5A. This shielding cover 12A has a lantern type, and when the lower end of the piece 2A is dipped in ozone water, the shielding vibrator 12A can protect the precise vibrator 6A from oxidative ozone water droplets. .

  In addition, the piece-like body 2A, the detection electrode 3A, the comparison electrode 4A, the vibrator 6A, and the water tank 1A are the same as the piece-like body 2, the detection electrode 3, the comparison electrode 4, and the vibrator 6 of the first embodiment. The description thereof is omitted here.

The ozone water concentration detection sensor 100A configured in this way immerses the detection electrode 3A and the comparison electrode 4A in ozone water in the water tank 1A, and turns on the power button 11A, whereby the vibrator 6A vibrates, and the electrode 3A , 4A, and the concentration is instantaneously displayed by the concentration indicator 9A.
In this embodiment, it can be sufficiently driven by a lightweight dry battery 101A such as an AA battery, and can withstand repeated use over a long period of time.

[Third embodiment]
FIG. 3 is a front view showing a main part of an ozone water concentration detection sensor 100B according to the third embodiment of the present invention.
The ozone water concentration detection sensor 100B of the third embodiment is different from the ozone water concentration detection sensors 100, 100A of the first and second embodiments, in addition to the detection electrode 3B and the comparison electrode 4B, the detection electrode 3B. And the comparison electrode 4B are provided with a correction electrode 13B for correcting the electromotive force change characteristic generated. The correction electrode 13B is provided at the lower end of the piece 2B so as to be parallel to the detection electrode 3B, and one end of the correction electrode 13B is connected to the detection electrode 3B by a high resistance 14B (10 kΩ to 50 kΩ). As the correction electrode 13B, for example, an electrode made of gold or palladium can be used.
In addition, the piece 2B, the detection electrode 3B, the comparison electrode 4B, the vibrator 6B, the ammeter 7B, the pivot 5B, and the bearing body 8B are the same as the piece 2 of the first embodiment, the detection electrode 3, and the comparison. Since the same electrode 4, vibrator 6, ammeter 7, pivot 5 and bearing body 8 can be used, the description thereof is omitted.
Thus, by providing the correction electrode 13B on the piece-like body 2B, the electric signal generated by the ozone concentration by the correction electrode 13B is corrected, and a higher-performance ozone water concentration detection sensor 100B can be obtained.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, although the pivot 5 having a sharp tip 51 is used as the bearing in the first embodiment, a rod-shaped pivot 5C as shown in FIG. 4 may be used as another shape. In this case, the piece-like body 2C is supported by inserting the rod-like pivot 5C into the insertion hole 21C of the piece-like body 2C. In FIG. 4, the piece 2C, the detection electrode 3C, the comparison electrode 4C, the vibrator 6C, and the water tank 1C are the same as the piece 2, the detection electrode 3, the comparison electrode 4, and the vibrator 6 of the first embodiment. Since the same thing can be used, the description is abbreviate | omitted.

  Further, although the detection electrodes 3, 3A, 3B, 3C and the comparison electrodes 4, 4A, 4B, 4C are linear electrodes, for example, various metal wires wound in a coil shape may be used. In this case, since the surface area of each electrode becomes large, an electromotive force with a large output can be obtained, and an analog or digital display device can be driven. Moreover, the usage-amount of the metal material of each electrode 3, 3A, 3B, 3C, 4, 4A, 4B, 4C can be decreased. In addition, a plate-like electrode may be used.

(a) is the side view which showed typically the ozone water concentration detection sensor 100 of 1st embodiment, (b) is the front view which showed the principal part of the ozone water concentration detection sensor 100 in (a). It is. It is the side view which showed typically the ozone water concentration detection sensor 100A of 2nd embodiment. It is the front view which showed the principal part of ozone water concentration detection sensor 100B of 3rd embodiment. It is the side view which showed typically the ozone water concentration detection sensor 100C which showed the modification.

Explanation of symbols

2 Piece 3 Detection electrode 4 Comparison electrode 5 Pivot (bearing)
6 vibrator 13B correction electrode 100, 100B ozone water concentration detection sensor

Claims (5)

Scissors,
A detection electrode and a comparison electrode provided in a lower portion of the piece,
A bearing for supporting the lower part of the piece-like body at the upper part of the piece-like body so as to be movable;
A vibrator that is provided on the piece and vibrates the piece;
An ozone water concentration detection sensor, wherein an electrical signal proportional to the ozone concentration of ozone water is obtained from an electromotive force generated by immersing the detection electrode and the comparison electrode in ozone water.   The ozone water concentration detection sensor according to claim 1, wherein the piece is made of ceramic.   3. The ozone water concentration detection sensor according to claim 1, wherein the piece has a thickness of 0.5 to 1.0 mm.   The ozone water concentration detection sensor according to any one of claims 1 to 3, wherein a correction electrode for correcting an electric signal generated by the ozone concentration of ozone water is provided on the piece-like body. The detection electrode is a metal coated with gold or platinum;
The ozone water concentration detection sensor according to any one of claims 1 to 4, wherein the comparison electrode is a metal having a silver surface coated with silver chloride.

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