JPH09236570A - Ph sensor and ion water maker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the adhesion of air bubbles contained in a soln. to be measured to the surface of a pH responding glass membrane and to stably measure the pH value of a very small amt. of a soln. to be measured with good responsiveness by connecting a pulsation generator to a water entering part. SOLUTION: When a soln to be measured is allowed to flow in a water entering part 37 from a supply pipe 45, the pulsated streams generated in a pulsation generator 55 flow into an internal space 39 and impinge against the surface of the end part of a glass electrode part 22 to rise along the surface of a pH responding glass membrane while revolving. Since the flow at this time is non-steady, when the soln. to be measured contain air bubbles, air bubbles ready to adhere to the surface of the pH responding glass membrane are prevented from adhering to the glass electrode part 22 and bonded air bubbles are again peeled. There is a tendency such that air bubble are easily stored in a part slow in flow velocity like a dead water region but, in the case of pulsated streams, the air bubbles within this region are easily removed by the effect of main flow and air bubble removing efficiency is enhanced. By this constitution, an ion water maker fitted with a pH sensor excellent in the stability of a display value is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pH sensor and an ion water generator for measuring the pH value of liquids containing bubbles such as alkaline water and acidic water obtained by electrolyzing raw water such as tap water and well water. It is about.

[0002]

2. Description of the Related Art In recent years, ion water generators have become popular due to the health boom. This ion water generator electrolyzes tap water etc. in the electrolytic cell to generate acidic water on the anode side,
It produces alkaline ionized water on the cathode side.

Recently, a technique in which a pH sensor for measuring the pH value of generated ion water is arranged in an ion water generator (Japanese Utility Model Publication No. 5-80587) has been proposed and is becoming mainstream.

Therefore, a continuous electrolysis type ion water generator equipped with this pH sensor will be described. FIG. 5 is a schematic overall view of a conventional ionized water generator. Reference numeral 1 is a raw water pipe such as tap water, 2 is a faucet, and 3 is an ion water generator connected to the raw water pipe 1 via a faucet 2. Reference numeral 4 is a water purification section having activated carbon or a hollow fiber membrane inside, 5 is a mineral supply section for adding minerals to the raw water to enhance conductivity, 6 is confirmation of water flow, and a control means to be described later is instructed to start control. Flow rate sensor, 8 is a diaphragm that divides the electrolytic cell 7 that electrolyzes the water that has passed through the flow sensor 6, and 9 and 10 are electrode plates arranged in each electrode chamber formed by dividing the electrolytic tank 7 into two. , 11 is a drainage pipe for discharging water on the side of the electrode plate 10 (acidic water when the electrode plate 10 is an anode), 12 is water for discharging on the side of the electrode plate 9 (alkaline ion water when the electrode plate 9 is a cathode) Connection pipe for supplying to the pH detection unit 13 provided in a part of the discharge pipe 15, a reference numeral 14 denotes a pH sensor accommodated in the pH detection unit 13, and a reference numeral 16 denotes residual water in the electrolytic bath 7 or a scale for electrode cleaning. Solenoid valve for discharging the dissolved cleaning water, 17 is an electrode through the drain pipe 11 10
Side water (acidic water when the electrode plate 10 is an anode) or electrolyzer 7
Water discharge pipe for discharging accumulated water or washing water of the battery, 19 is a power supply unit for converting AC from the power supply plug 18 into DC, 20 is control means for controlling the operation of the ion water generator 3, and 53 is ion water generation. It is an operation display unit for displaying an operation state of the device 3 and setting operation conditions and the like.

The operation of the conventional pH sensor and ion water generator configured as described above will be described below. The raw water that has been passed through the water tap 1 from the raw water pipe 1 has a water purifier 4 that removes the residual chlorine odor and impurities such as general bacteria, and the mineral supply unit 5 dissolves minerals such as calcium glycerophosphate. After being treated with water that can be easily electrolyzed, water is passed through the flow rate sensor 6 to the electrolytic cell 7. on the other hand,
AC voltage is applied from the power-on plug 18 and the power supply unit 1
After being converted into a direct current at 9, it is supplied to the electrode plate 9 and the electrode plate 10 of the electrolytic cell 7. As a result, acidic ionized water is generated in the anode chamber and alkaline ionized water is generated in the cathode chamber. When a voltage is applied so that the electrode plate 9 has a negative voltage while passing water, the alkaline ion is discharged from the discharge pipe 15. Water is obtained continuously. When a voltage is applied so that the electrode plate 9 has a positive voltage, acidic water is continuously obtained from the discharge pipe 15. P of ionized water generated in the electrolytic cell 7
The H value is measured by the pH sensor 14, and the sensor output value is fed back to the control means 20 to obtain a desired p value.
Ionic water with an H value is obtained.

[0006]

The ionized water generated by the ionized water generator is electrolyzed in the electrolytic cell, so that oxygen gas and hydrogen gas generated during electrolysis are generated, so that even a very small amount is generated. However, these become bubbles and are mixed in the ionized water and discharged from the electrolytic cell. When the pH value of ionized water containing these bubbles is measured by the pH sensor on the discharge side of the electrolytic cell, these bubbles adhere to the glass electrode part of the pH sensor and the output value of the pH sensor is not stable. There was a problem. Particularly in the case of a pH sensor equipped with a glass electrode part, the glass on the surface of the glass electrode part is negatively charged, so that components such as calcium ions in the raw water adhere to the surface of the glass electrode part. Although it is a small amount, it becomes a surface with precipitates and the inflowing bubbles tend to adhere, and once the bubbles adhere here, they form a nucleus as a nucleating bubble and the bubble grows further. there were. When the bubbles grow, the stability of the output value of the pH sensor having the glass electrode portion is greatly impaired. Moreover, since the adherence of air bubbles has a greater effect as the pH sensor has a very small amount of liquid to be measured,
It has been a practical obstacle to realizing a very small amount of pH sensor.

Therefore, the present invention solves the above-mentioned conventional problems by preventing bubbles contained in the liquid to be measured from accumulating in the body of the sensor and adhering to the surface of the pH responsive glass film, and adhering bubbles. It is an object of the present invention to provide a pH sensor that can be efficiently removed and that can measure the pH value stably and responsively with a minute amount of the liquid to be measured.

Further, according to the present invention, the pH value of ionized water containing bubbles generated by electrolysis can be stably measured even in a very small amount, and the ion is safe even if the pH sensor is damaged. It is intended to provide a water generator.

[0009]

In order to achieve the above object, the pH sensor of the present invention is filled with an internal liquid and at the same time p.
A glass electrode part having an H-responsive glass film, a reference electrode part filled with a reference electrode solution, a body part in which a water-injecting part and a discharge part are connected and a pH-responsive glass film is housed in an internal space, and a reference electrode part And a pulsation generator is connected to the water inlet on the discharge path side.

According to the present invention, it is possible to prevent the bubbles contained in the liquid to be measured from accumulating in the body of the sensor and adhering to the surface of the pH responsive glass film, and the adhering bubbles can be efficiently removed. It is possible to provide a pH sensor capable of measuring a pH value of a liquid to be measured in a stable and responsive manner.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is directed to a glass electrode portion filled with an internal liquid and provided with a pH responsive glass membrane, a reference electrode portion filled with a reference electrode liquid, and a water inlet portion. And a main body part to which the discharge part is connected and the pH-responsive glass film is housed in the internal space, and a liquid junction part provided in the reference electrode part for communicating the reference electrode liquid with the liquid to be measured. Since the pulsation generator is connected to the pH sensor, the liquid to be measured flowing from the water inlet part is pulsated by the pulsation generator and becomes an unsteady flow into the internal space, and the internal space such as the pH responsive glass membrane It is possible to prevent bubbles from adhering to the inner surface, and it is possible to efficiently remove the bubbles once attached.

According to a second aspect of the present invention, the pulsation generator includes a valve body that receives the dynamic pressure of the liquid to be measured and an urging body that urges the valve body in a direction opposite to the inflow direction of the liquid to be measured. Since the pH sensor has the center of gravity of the valve body and the biasing body deviated from the axis, the valve body is pushed open and the flow path is opened by the inflow of the liquid to be measured. Since it is displaced from the axial center, it vibrates due to the dynamic pressure of the flow, and pulsation occurs in the liquid to be measured discharged from the pulsation generator.

The invention as set forth in claim 3 is provided with an electrolytic cell, a pair of electrodes provided in the electrolytic cell, a discharge channel connected to the electrolytic cell, and a drain channel branched from the discharge channel. To p
It is an ion water generator equipped with an H sensor that can stably measure the pH value of ion water containing bubbles generated by electrolysis, even if it is a minute amount, and the pH sensor may be damaged. Is also safe.

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3 and 4.

(Embodiment 1) First, a pH sensor according to Embodiment 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic sectional view of a pH sensor according to the first embodiment of the present invention. Reference numeral 21 is a pH sensor, 22 is a glass electrode portion in which a pH-responsive glass film 40 sensitive to hydrogen ions of the liquid to be measured is formed in the liquid contact portion, and 23 is Ag / AgC
The first internal electrode composed of 1 is immersed in the internal liquid 24 which is a salt solution having a pH of 7.0. The glass forming the pH-responsive glass film 40 is a glass containing SiO ₂ and LiO ₂ as main components. Reference numeral 25 is a tube-shaped glass container made of inert glass, 29 is a reference electrode section, and a reference electrode chamber is provided with a reference electrode solution 26 made of a solution of a neutral salt. Is immersed in the second internal electrode 27 made of Ag / AgCl. Reference numeral 28 denotes a liquid junction, which is made of porous ceramic or the like and connects the measured liquid and the reference electrode liquid 26. Reference numeral 30 is a replenishing port for replenishing the reference electrode liquid 26, 31 is a terminal connecting portion connecting the pH sensor 21 and the control means 34, 32 is a first output terminal connected to the first internal electrode 23, and 33 is a second internal. Second connected to the electrode
The output terminal is connected to the control means 34.

When the pH-responsive glass film 40 is dipped in the liquid to be measured, hydrogen ions of the liquid to be measured form a fixed charge phase on the surface of the pH-responsive glass film 40, and the hydrogen ion between the liquid to be measured and the internal liquid 24. Generates electromotive force. On the other hand, the liquid to be measured communicates with the reference electrode liquid 26 through the liquid junction 28, and the second internal electrode 27 immersed in the reference electrode liquid 26 has a zero potential with respect to the liquid to be measured, so that the first output terminal 32. A sensor voltage proportional to the hydrogen ion concentration of the liquid to be measured is output between the second output terminal 33 and the second output terminal 33. This sensor output is expressed by the following equation.

E = α · 0.059 (pH0−pH) + Cv where E: sensor voltage (V) α: electrode coefficient 0 <α ≦ 1 pH0: pH value of the internal liquid, where pH0 = 7. 0 pH: pH value of the measured liquid Cv: Asymmetric potential difference (V) peculiar to the electrode Since the pH sensor 21 sets the pH 0 of the internal liquid 24 to 7.0, the pH of the measured liquid is neutral (pH = 7). .0), the sensor voltage E is 0V except for the asymmetric potential.

On the other hand, the pH of the liquid to be measured is acidic (pH <7.
If 0), the sensor voltage E becomes a positive voltage, except for the asymmetric potential, and the pH of the measured liquid is alkaline (pH> 7.0).
In that case, the sensor voltage E becomes a negative voltage except for the asymmetric potential.

The output sensor voltage E is amplified as necessary, and the pH value is displayed on the display unit or the sensor voltage E is displayed.
Is transmitted to the control means 34, and the control means 34 controls the voltage for electrolysis in the case of an ion water generator, for example.

Next, the main body portion 35 according to the first embodiment of the present invention will be described. The main body portion 35 includes a water inlet portion 37 and a discharge portion 3.
8 and the internal space 39. The water inlet 37 has a pH
It is provided in the tangential direction of the surface of the response glass film 40. The discharge part 38 is also oriented in the tangential direction of the surface of the pH responsive glass film 40 and is provided above the water entry part 37. The inner space 39 accommodates the glass electrode portion 21 and is substantially cylindrical and has a volume of substantially 10 cm ³ or less. The central axis of the inner space 39 is the pH responsive glass film 40.
The container is substantially aligned with the central axis of the container, and a water inlet 37 is provided at the bottom. By setting the volume to 10 cm ³ or less, the response of measurement can be accelerated. However, if it is too small, the stability deteriorates due to the influence of bubbles. The water inlet 37 and the outlet 38 are each formed in a plane orthogonal to the central axis of the internal space 39.
The liquid to be measured flowing in from the water inlet 37 p
A slight taper surface is formed around the bottom so that the H-responsive glass film 40 smoothly swirls and rises. The liquid to be measured is discharged from the discharge unit 38 after the swirl and rise. A lock mechanism 36 locks the glass electrode portion 22 side and the main body portion 35.

By the way, the water inlet 37 is connected to a supply pipe 45 for supplying the liquid to be measured. As shown in FIG. 3, 55 is a pulsation generator provided in the supply pipe 45,
Reference numeral 4 is a casing having a valve seat that constitutes the pulsation generator 55, and reference numeral 56 is a valve body that receives the dynamic pressure of the liquid to be measured. Valve 5
Reference numeral 6 comprises a disc and a shaft rod passing through this shaft center. Reference numeral 57 is a spring that is a biasing body that biases the valve body 56 in the direction opposite to the direction in which the liquid to be measured flows, and 58 is a cushioning material between the valve seat formed on the casing 55 and the valve body 56. It's a ring.
The spring 57 may have the other end attached to a protrusion in the casing 54 while pressing the valve body 56 against the valve seat, or the other end may be locked to the protrusion of the casing 54 while pressing the valve body 56 against the valve seat. Has become. Since the spring 57 is wound in a spiral shape, the center of gravity of the disc of the valve body 56 and the spring 57 is displaced from the axis as a whole, although it is slight. Furthermore, this valve body 5
In order to shift the center of gravity of 6 and the spring 57 from the axial center, holes or openings may be attached to the valve body 56, and conversely weights may be attached to positively break the balance to make it unbalanced.

Then, the liquid to be measured flowing from the supply pipe 45 exerts a dynamic pressure on the valve body 56, but the valve body 56 and the spring 5
Since the center of gravity of 7 is displaced from the axis as a whole, the measured liquid starts to vibrate the valve body 56. Particularly, since the valve body 56 is provided with the shaft rod, the swinging motion is started around the shaft center. Due to this swinging motion, pulsation is generated in the internal flow of the supply pipe 45, and it becomes an unsteady flow, and the bubbles adhering to the surface of the pH responsive glass membrane 40 through the water inlet 37 can be removed. . At the same time, dust and the like in the main body 35 can be discharged. And p of the glass electrode part 22
Even when the H-responsive glass film 40 has a spherical shape, this pulsating flow can also discharge bubbles that tend to accumulate in the dead water region behind the pH-responsive glass film 40.

The operation of the pH sensor 21 constructed as above will be described below. When the liquid to be measured whose pH is to be measured is caused to flow from the water inlet 37 through the pulsation generator 55, the pulsating flow generated by the pulsation generator 55 flows into the internal space 39 and hits the end surface of the glass electrode part 22. It rises while swirling along the surface of the pH-responsive glass membrane 40. At this time, since the flow is unsteady, when the liquid to be measured contains bubbles, the bubbles trying to adhere to the surface of the pH-responsive glass film 40 are prevented from adhering to the glass electrode portion 22, and the adhered bubbles are Stripped again. Further, although bubbles tend to accumulate in a portion having a slow flow velocity such as the dead water region described above, in the case of a pulsating flow, bubbles in these regions are easily removed due to the influence of the main flow, and the bubble removal efficiency is improved.

By the way, in addition to giving pulsation, the water inflow direction of the water inflow portion 37 is made tangential to the pH responsive glass film 40, so that the bubbles adhering to the surface of the pH responsive glass film 40 can be more effectively removed. In addition, the pH-responsive glass film 4
If the distance between the surface of 0 and the inner surface of the internal space 39 is narrowed, the speed of the liquid to be measured can be increased and the same effect can be obtained. However, if the space is made too narrow, bubbles are likely to be formed, which hinders the removal of bubbles. Therefore, it is desirable to make the size 1.5 to 3 times the size of the bubbles contained in the liquid to be measured. Since bubbles of oxygen gas and hydrogen gas generated in the ion water generator are approximately 1 mm or less, it is appropriate to set this interval to about 1.5 to 3 mm in the case of the ion water generator.

By the way, since the surface of the pH responsive glass film 40 is negatively charged, calcium ions and potassium ions contained in the liquid to be measured are deposited. This precipitate adheres to the surface of the pH responsive glass film 40 and becomes a source for further adhesion of bubbles. Therefore, when measuring a liquid containing such a component, it is desirable to slightly increase the inflow velocity or slightly increase the magnitude of pulsation in the above interval.

The liquid to be measured which has swirled up along the glass electrode portion 22 hits the liquid junction portion 28 of the pH sensor 1. Since the measured liquid is connected to and electrically connected to the reference electrode liquid 26 by the liquid junction 28, the second internal electrode 27 immersed in the reference electrode liquid 26 has the same potential as the measured liquid and the first output. Terminal 3
A sensor voltage E proportional to the hydrogen ion concentration of the liquid to be measured is output between 2 and the second output terminal 33. In this way, the pH of the liquid to be measured flowing in the internal space 39 can be measured. The liquid to be measured and the bubbles are discharged together from the discharge section 38. Bubble removal efficiency can be further improved by providing a taper surface on the inner surface of the internal space 39 below the position where the discharge part 38 is provided, which promotes smooth discharge of the liquid to be measured.

In the first embodiment, since the pulsation generator 55 is provided in front of the glass electrode portion 22 of the pH sensor 21, bubbles easily generated in the supply pipe 45 which are likely to cause a problem when a small amount of the liquid to be measured is generated. Since the bubbles can be prevented from adhering to the glass electrode part 22 and the bubbles adhering to the glass electrode part 22 can be removed, the stability and responsiveness of the displayed value are excellent. Since the pulsation generator 55 is connected to the water inlet portion 37 on the discharge passage side, the pressure rises as the water flow in and the pressure valve 56
Is released and pulsation occurs, but when the pressure drops, the pressure valve 56 returns to its original state. At the moment when this pressure valve 56 is opened,
The water flow is vigorous, and the pH-responsive glass film 40 of the pH sensor 21.
It is possible to efficiently remove the bubbles adhering to the surface of the pH-responsive glass film 40 and the glass electrode part 22 by contacting the surface of the glass with the pulsation.

(Embodiment 2) Next, an ionized water generator provided with the pH sensor of the present invention will be described. 2 is an overall schematic view of an ion water generator according to Embodiment 2 of the present invention, FIG. 3 is a partially enlarged view of a pulsation generator of the ion water generator according to Embodiment 2 of the present invention, and FIG. FIG. 7 is a partially enlarged view of the pH sensor of the ion water generator according to the second embodiment. In FIG. 2, the same reference numerals as those used in the description of the conventional ionized water generator of FIG. 5 and the pH sensor of FIG. 1 basically overlap with those of FIGS. 1 and 5. Therefore, detailed explanation is omitted here.

Reference numeral 1 is a raw water pipe for tap water or the like, 2 is a faucet, and 3 is an ion water generator connected to the raw water pipe 1 through a faucet 2. Reference numeral 4 is a water purification unit having activated carbon or a hollow fiber membrane inside, 5 is a mineral supply unit for enhancing conductivity, 6 is a flow rate sensor for confirming water flow and instructing a control means described later to start control, 8 is electrolysis A diaphragm that divides the tank 7 into two parts, 9 and 10 are electrode plates arranged in each electrode chamber formed by dividing the tank 8 into two parts, 11
Is a drainage pipe for discharging water on the electrode plate 10 side (acidic water when the electrode plate 10 is an anode), and 42 is water discharge for discharging water on the electrode plate 9 side (alkaline ionized water when the electrode plate 9 is a cathode) A branch pipe for supplying a part of the water to the pH sensor 21, 15 is water on the side of the electrode plate 9 (alkali ionized water when the electrode plate 9 is a cathode)
A discharge pipe for discharging the pH sensor, 43 a calibration liquid injection part for injecting a calibration liquid for calibrating the pH sensor 21 into the pH sensor 21, 44 an electromagnetic valve for supplying cleaning water for cleaning the electrode to the pH sensor 21, and 45 an electrode plate A supply pipe for supplying a part of water on the 9 side (alkali ion water when the electrode plate 9 is a cathode) or cleaning water for electrode cleaning to the pH sensor 21, 35 for the main body of the pH sensor 21, and 37 for the supply pipe. A water inlet for connecting 45 to the internal space 39 in the pH sensor 21, and 22 for sensing hydrogen ions p
A glass electrode part provided with an H-responsive glass film 40, and 23 is pH
= A immersed in the internal solution 24 which is a salt solution of 7.0
First internal electrode made of g / AgCl, 25 is a tubular glass container made of inert glass, 29 is a reference electrode part, 26 is a reference electrode solution made of a solution of a neutral salt, and 27 is A.
A second internal electrode made of g / AgCl, 31 is a liquid junction such as a porous ceramic, and 30 is a replenishment port for replenishing the reference electrode liquid 26. Reference numeral 31 is a terminal connection portion that connects the pH sensor 21 and the control means 34, 38 is a discharge portion that connects the pH sensor 21 and a discharge pipe 47 that discharges the measured liquid whose measurement has been completed, and 46.
Is a drainage port for draining the measured liquid remaining in the internal space 39,
36 is a lock mechanism for locking the pH sensor 21. Reference numeral 48 is a connecting pipe connecting the drain port 46 and the discharge pipe 47, 49 and 50 are water-saving solenoid valves for not performing drainage in the water purification mode, 51 is a power supply section for converting alternating current from the power-on plug 52 into direct current, Reference numeral 34 is a control means for controlling the operation of the ion water generator 3, and 53 is an operation display unit for displaying the operation state of the ion water generator 3 and setting operation conditions and the like. A pulsation generator 55 is provided in the supply pipe 45. 54 is a casing, 56 is a valve element, 57 is a spring, and 58 is an O-ring.

Ionized water generator 3 configured as described above
The operation will be described below. Raw water pipe 1 to faucet 2
The raw water that has been opened and passed through the water purification unit 4 removes the residual chlorine odor and impurities such as general bacteria in the raw water, and is passed through the flow rate sensor 6 to the electrolytic cell 7. At that time, the electrode plate 10
The water supplied to is processed by the mineral supply unit 5 into water in which minerals such as calcium glycerophosphate are dissolved and which is easily electrolyzed. When the inflowing raw water exceeds a certain amount, AC100V voltage is applied from the power-on plug 52, and the power source unit 5
After being converted into direct current by 1, the electric current is supplied to the electrode plate 9 and the electrode plate 10 of the electrolytic cell 7, and electrolysis starts. As a result, alkaline ionized water is generated around the cathode and acidic ionized water is generated around the anode, and the discharge pipe 15 and the drain pipe 1 connected to the electrolytic cell 7 are respectively formed.
Spilled from 1. When a voltage is applied such that the electrode plate 9 has a negative voltage and the electrode plate 10 has a positive voltage while passing water in this manner, most of the generated alkaline ionized water is discharged to the outside through the discharge pipe 15. , Part 1
About 100 to 500 ml / min passes through the branch pipe 42, the supply pipe 45, and the pulsation generator 55 provided in the discharge pipe 15, and the water inlet 37.
More flow into the pH sensor 21. The inflowing alkaline ionized water is the liquid to be measured in this case, but it hits the surface end of the pH responsive glass film 40 of the glass electrode portion 22 in a pulsating state and rises while swirling along the glass electrode. At that time, the alkaline ionized water contains hydrogen gas generated by electrolysis as bubbles.
Generate pulsation, and the water inlet portion 37 and the discharge portion 38 are provided in the tangential direction of the surface of the pH-responsive glass film 40, so that bubbles included due to the pulsation and the flow velocity are prevented from adhering to the glass electrode portion 22. Disturbed. And, even if it adheres once, the bubbles are removed again. The higher the swirling speed of the alkaline ionized water, the higher the efficiency of removing bubbles. Therefore, it is desirable that the efficiency is large. However, since a large amount of waste water must be discarded, it is better not to increase it so much. According to experiments, if the distance between the pH-responsive glass film 40 of the glass electrode part 22 and the internal space 39 is set to about 1.5 to 3 times the gas diameter of bubbles, the adhesion of bubbles can be reduced. However, when the raw water such as tap water contains a large amount of components such as calcium, they are deposited on the surface of the pH-responsive glass film 40 and adhere to the surface of the pH-responsive glass film 40, which further promotes the adhesion of air bubbles. In this case, it is desirable to increase the magnitude of pulsation or slightly increase the flow rate of the alkaline ionized water flowing from the water inlet 37.
Since the internal space 39 is substantially cylindrical and has a volume of substantially 10 cm ³ or less, it is possible to improve the responsiveness of measurement. The alkaline ionized water that rose while turning was p
It collides with the liquid junction portion 28 of the H sensor 21 and flows out from the discharge portion 38. Bubbles can be removed more smoothly by providing a tapered surface on the lower side of the discharge portion 38 of the internal space 39. pH sensor 21
Detects the pH concentration of the alkaline ionized water, sends the sensor voltage from the terminal connection unit 31 to the control unit 34, and the control unit 34 causes the operation display unit 53 to display the pH concentration.

As described above, in the ion water generator according to the second embodiment of the present invention, the raw water is continuously introduced, and the voltage is continuously applied to the electrode plates 9 and 10 to continuously generate the alkaline ion water. However, the detection and display of the pH concentration of the alkaline ionized water generated at this time can be continuously performed at the same time. When the applied voltage is reversed and the electrode plate 9 is applied to the anode and the electrode plate 10 is applied to the cathode, the acidic ion water is discharged from the discharge pipe 15 and the alkaline ion water is discharged from the drain pipe 11 contrary to the above description. Will be discharged. In this case, the acidic ionized water flows into the pH sensor 21, and the pH sensor 21 can detect and display the pH concentration of the acidic ionized water.

When water purification is required, the water-saving solenoid valve 4
By closing 9, 50, purified water can be discharged only from the discharge pipe 15. However, if 36 of the water-saving solenoid valves is opened, the pH concentration of purified water can be detected and displayed.

As described above, according to the ion water generator of the second embodiment, the pH value of ion water containing bubbles generated by electrolysis can be stably and responsively measured even if the pH value is very small. Even if the pH sensor is damaged, the branch pipe 42 is provided with the pH sensor 21 and the discharge pipe 15 is not provided with the pH sensor 21, which is safe.

[0034]

INDUSTRIAL APPLICABILITY The pH sensor of the present invention can effectively prevent air bubbles contained in the liquid to be measured from accumulating in the body of the sensor by pulsation, even if it adheres to the glass electrode part of the pH sensor. The adhered bubbles can be removed efficiently, and the pH value can be stably measured even with a small amount of the liquid to be measured. Further, it is possible to provide an ionized water generator with a pH sensor that is excellent in the stability of the displayed value.

Furthermore, the ion water generator of the present invention can stably measure the pH value of ion water containing bubbles generated by electrolysis even in a minute amount, and the pH sensor may be damaged. Is also safe.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a pH sensor according to a first embodiment of the present invention.

FIG. 2 is an overall schematic diagram of an ionized water generator according to Embodiment 2 of the present invention.

FIG. 3 is an enlarged view of a pulsation generator for an ionized water generator according to Embodiment 2 of the present invention.

FIG. 4 is a partially enlarged view of the pH sensor of the ion water generator according to the second embodiment of the present invention.

FIG. 5 is a schematic overall view of a conventional ionized water generator.

[Explanation of symbols]

 1 Raw water pipe 2 Faucet 3 Ion water generator 4 Water purification part 5 Mineral supply part 6 Flow rate sensor 7 Electrolysis tank 8 Separator 9, 10 Electrode plate 11 Drain pipe 12 Connection pipe 13 pH detection part 14, 21 pH sensor 16, 44 Electromagnetic Valve 17 Water discharge pipe 18 Power supply plug 19 Power supply part 20, 34 Control means 22 Glass electrode part 23 First internal electrode 24 Internal liquid 25 Glass container 26 Reference electrode liquid 27 Second internal electrode 28 Liquid junction part 29 Reference electrode part 30 Refill port 31 Terminal connection part 32 First output terminal 33 Second output terminal 34 Control means 35 Main body part 36 Lock mechanism 37 Water inlet part 38 Discharge part 39 Internal space 40 pH responsive glass film 42 Branch pipe 43 Calibration liquid injection part 45 Supply pipe 46 Drain Port 47 Discharge Pipe 48 Connection Pipe 49, 50 Water Saving Solenoid Valve 51 Power Supply 52 Plug 53 Operation Display 54 Pacing 55 pulsation generating device 56 the valve member 57 spring 58 O-ring

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location G01N 27/46 361A (72) Inventor Ryoji Tanaka 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Takuma Sato 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A pH responsive glass filled with an internal liquid and provided with a pH responsive glass membrane, a reference electrode part filled with a reference electrode liquid, a water inlet and an outlet are connected to each other in the internal space. A main body accommodating a membrane, a liquid junction part provided in the comparison electrode part for communicating the comparison electrode liquid and the liquid to be measured, and a pulsation generator is connected to the water inlet part on the discharge path side. And a pH sensor. 2. The valve body, wherein the pulsation generator includes a valve body that receives a dynamic pressure of the liquid to be measured, and a biasing body that biases the valve body in a direction opposite to a direction in which the liquid to be measured flows. The pH sensor according to claim 1, wherein the center of gravity of the urging body is displaced from the axis. 3. An electrolytic cell, a pair of electrodes provided in the electrolytic cell, a discharge channel connected to the electrolytic cell, and a drain channel branched from the discharge channel, wherein the drain channel is provided. An ion water generator comprising the pH sensor according to 1 or 2.