JPH06238275A - Alkali ion water preparation device - Google Patents

Abstract

PURPOSE:To provide an alkali ion water preparation device which is capable of controlling deionized water accurately by determining and storing the correlationship between the pH value, flow and electrolytic current of the deionized water using a control part and determining the pH value using the correlationship between the flow and the electrolytic current by pH value adjustment. CONSTITUTION:The subject alkali ion water preparation device is not only equipped with an electrolytic tank 1 but also pH meters 21, 20 which measure the pH value of electrolysis-produced water which is discharged from the electrolytic tank 1, flowmeters 13, 14, an ammeter 16 and an arithmetic control part 17. In addition, when the alkali ion water preparation device is installed, the arithmetic control part 17 measures an electrolytic current using the ammeter 16 and the flow and pH value of acid water and alkali water using the flowmeters 13, 14 and the pH value meters 21, 20. Further, the arithmetic control part 17 determines the correlationship between the flow and the pH value and stores it. Thus the arithmetic control part 17, based on the amperage and the flow obtained from the ammeter 16 and the flowmeters 13, 14, calculates the pH value using the initial correlationship for following value determinations, and controls the electrolytic current and the flow, if the pH value deviates from a desired level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alkaline ionized water conditioner which ionizes water by electrolysis.

[0002]

2. Description of the Related Art In an alkaline ionized water conditioner which produces alkaline ionized water and acidic water by electrolysis of water, the pH of both ionized water is generally controlled by keeping the flow rate of the water constant. This is done by changing the voltage.

[0003]

However, at this time, even if the same cell voltage is applied, if the electric conductivity of the raw water is different, the electrolysis current is different, so that the pH of the ionic water is also different. Therefore, in actual pH adjustment, the pH value of the produced ionized water must be measured and fed back.
I can't do it accurately.

Here, the pH of the produced ionized water
The value may be measured with an indicator or with a pH meter, but the former cannot perform continuous measurement, and the cell voltage of the electrolytic cell is controlled based on the measured pH value. Since it cannot be applied to automatic pH control, it is conceivable to use the latter pH meter. However, if the pH meter is a glass electrode type, for example,
The pH is checked by comparing the potassium chloride solution stored in the glass tube with the measurement water, but since the potassium chloride solution leaks at the time of comparison, it must be replenished each time it is used. The same applies to other types of pH meters, which cannot be applied to continuous measurement, and therefore the pH of ionized water cannot be accurately controlled.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an alkaline ionized water conditioner capable of accurately controlling the pH of ionized water.

[0006]

SUMMARY OF THE INVENTION The present invention, however, comprises an electrolytic cell, and a pH measuring section for ionized water discharged from the electrolytic cell and a control section for adjusting the pH value by controlling the electrolytic current and the flow rate. In the alkaline ionized water device, the control unit is provided with a storage unit for obtaining and storing the correlation between the pH value of the ionized water obtained from the pH measuring unit, the flow rate and the electrolysis current, and the pH adjustment is performed by the flow rate and the electrolysis current. From the pH measurement unit, or a storage unit that stores the correlation between the pH value and flow rate of ionized water obtained from the pH measurement unit and the gas generation amount in the ionized water. Be equipped with
For pH adjustment, p
The feature is that it is performed by obtaining the H value.

[0007]

According to the present invention, the pH measurement by the pH measuring unit is used only when obtaining the correlation with the initial flow rate, the electrolytic current and the gas generation amount, and thereafter from the flow rate, the electrolytic current and the gas generation amount. Since the pH is calculated, it is not affected by the short life of the pH measuring unit.

That is, the pH is an index representing the hydrogen ion concentration H ⁺ of the solution, and is defined by the following formula pH = -log [H ⁺ ], and the hydrogen ion concentration H ⁺ and the hydroxide ion concentration OH ^−. The product of is constant at each temperature, and at 25 ° C., H ⁺ × OH ⁻ = 10 ⁻¹⁴ . Therefore, in order to know the pH, the hydrogen ion concentration or the hydroxide ion concentration may be measured by some means.

Here, when water is electrolyzed by an electrolyzer in which an electrolytic diaphragm is arranged between two electrode plates, a reaction of 2OH ⁻ → 2H ⁺ + 4e ⁻ + O ₂ ↑ occurs on the anode side, and hydrogen ions are generated. Is generated, the reaction becomes acidic on the cathode side, and the reaction of 2H ₂ O + 2e ⁻ → 2OH ⁻ + H ₂ ↑ occurs to generate alkali metal due to the generation of hydroxyl ions.

The amount of hydrogen ions and hydroxide ions generated by electrolysis is the amount of flowing electricity (product of current and time).
(Faraday's law), the amount of hydrogen ions and hydroxide ions generated is proportional to the electrolytic current and inversely proportional to the flow rate. For this purpose, while changing the voltage applied to the electrolytic cell at the time of installing the alkaline ionized water device, while measuring the electrolytic current and the flow rate of ion water at that time,
The pH of the generated ionic water is measured with a pH meter, and if these relationships are stored, the pH will be calculated from the above relational expression from the electrolytic current and the ionic water flow rate from the next time, and used for display and control. be able to.

Further, as is clear from the above reaction formula, the amounts of hydrogen ions and hydroxide ions generated are proportional to the amount of oxygen generated in acidic water and the amount of hydrogen generated in alkaline ionized water, respectively. By changing the voltage applied to the tank and measuring the amount of oxygen and hydrogen generated at that time, the pH of the generated ion water is measured with a pH meter, and if these relationships are stored, the gas will be used from the next time. From the generated amount and the flow rate of ionized water, pH can be calculated from the above relational expression and used for display and control.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiments. In FIG. 1, reference numeral 1 denotes an electrolytic cell which is divided into an anode chamber 5 and a cathode chamber 6 by an electrolytic diaphragm 4. An anode 2 is provided in the chamber 5, and a cathode 3 is provided in the cathode chamber 6, and the anode 2 and the cathode 3 are connected to a DC power source 15 via an ammeter 16. Further, a water supply pipe 8 communicating with the anode chamber 5 and the cathode chamber 6, an acidic water water supply pipe 11 communicating with the anode chamber 5, and an alkaline ion water supply pipe 10 communicating with the cathode chamber 6 are connected to the electrolytic cell 1. The acidic water supply pipe 11 is provided with an electromagnetic valve 19, a flow sensor 13, and a pH meter 20, and the alkaline ionized water supply pipe 10 is also provided with an electromagnetic valve 12.
The flow rate sensor 14 and the pH meter 21 are provided, and the electromagnetic valves 19 and 12, the flow rate sensors 13 and 14, the pH meters 21 and 20, and the ammeter 16 are connected to the arithmetic control unit 17. Reference numeral 18 in the figure denotes a pH display unit connected to the arithmetic control unit 17.

The water supplied from the water supply pipe 8 to the electrolytic cell 1 is
It is electrolyzed by an electric current flowing between the anode 2 and the cathode 3, acidic water is generated in the anode chamber 5 and alkaline ionized water is generated in the cathode chamber 6, and the acidic water supply pipe 11 and the alkaline ionized water supply pipe 10 are respectively formed. These ionized waters are respectively discharged from the operation control unit 17 from the voltage of the DC power supply 15 and the electromagnetic valve 19, when the alkaline ionized water device is installed.
A signal for controlling the opening degree of 12 is output, and the electrolysis current at this time is measured by an ammeter 16, the flow rate and pH of acidic water are measured by a flow meter 13 and a pH meter 21, and the flow rate and pH of alkaline ionized water are measured.
Is measured by the flow meter 14 and the pH meter 20, and as shown in FIG. 2, the correlation between the electrolysis current, the flow rate, and the value of pH is obtained, and this is stored in the arithmetic control unit 17.

From the next time, the pH meters 21 and 2 will be used.
Instead of measuring pH of ionized water at 0, ammeter 16
From the current value and the flow rate obtained from the flow rate sensors 13 and 14, the pH is calculated using the initial correlation value and displayed on the pH display unit 18, and when it deviates from the desired pH value, The arithmetic control unit 17 controls the electrolytic current and the flow rate through the DC power supply 15 and the electromagnetic valves 19 and 12.

The correlation between pH, electrolysis current and flow rate shown in FIG. 3 was obtained from tap water in the Tokyo region, which had an initial pH value of 7.6. FIG. 4 shows another embodiment. Here, gas generation amount measuring units 7 and 9 are added to the acidic water supply pipe 11 and the alkaline ionized water supply pipe 10. As the gas generation amount measuring units 7 and 9 as described above, it is possible to use, for example, a sensor that measures the light transmittance of ionized water by utilizing the generated gas mixed with water and coming out. When the alkaline ionized water device is installed, the arithmetic control unit 17
Outputs a signal for controlling the voltage of the DC power supply 15 and the opening of the electromagnetic valves 19 and 12, and the flow rate of acidic water and p
Flow meter 13 and pH meter 21 for H and gas (oxygen) generation
And the gas generation amount measurement unit 7, and the flow rate, pH, and gas (hydrogen) generation amount of the alkaline ionized water are measured by the flow meter 14, the pH meter 20, and the gas generation amount measurement unit 9, and as shown in FIG. , The correlation between the gas generation amount, the flow rate, and the pH value is obtained and stored in the arithmetic control unit 17.

From the next time onward, the pH meters 21, 20 will be
Instead of measuring the pH of the ionized water by using the above-mentioned initial correlation value, the pH is calculated from the gas generation amount and flow rate obtained from the gas generation amount measurement units 7 and 9 and the flow rate sensors 13 and 14.
Is calculated and displayed on the pH display unit 18,
When the pH value deviates from the desired pH value, the arithmetic control unit 17 controls the electrolytic current and the flow rate through the DC power supply 15 and the electromagnetic valves 19 and 12.

[0017]

As described above, in the present invention, the pH measurement by the pH measuring section is used only for obtaining the correlation with the initial flow rate, the electrolytic current and the gas generation amount, and thereafter, the flow rate and the electrolytic current are used. Or p to obtain pH from the amount of gas generated
Although it is not affected by the short life of the H measuring part, and the pH is not directly measured, as described above, the flow rate, the electrolytic current, and the gas generation amount are constant with the pH value. Because of the relationship, accurate control of the pH of the ionized water is possible.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example.

FIG. 2 is an explanatory diagram showing the correlation between pH, flow rate, and electrolysis current as in the above.

FIG. 3 is an explanatory diagram showing the correlation between pH, flow rate, and electrolysis current as above.

FIG. 4 is an explanatory diagram of another embodiment.

FIG. 5 is an explanatory diagram showing a correlation among pH, a flow rate, and a gas generation amount in the same as above.

[Explanation of symbols]

 1 Electrolyzer 13 and 14 Flowmeter 16 Ammeter 17 Arithmetic control unit 21 and 20 pH meter

Claims (2)

[Claims] 1. An alkali ion water purifier comprising an electrolyzer and a pH measuring unit for controlling the pH value of ionized water discharged from the electrolyzer and a control unit for adjusting the pH value by controlling the electrolysis current and the flow rate. The unit includes a storage unit that stores and stores the correlation between the pH value of ionized water obtained from the pH measurement unit, the flow rate, and the electrolysis current. For pH adjustment, the pH value is calculated from the flow rate and the electrolysis current using the above correlation. An alkaline ionized water conditioner characterized in that it is required. 2. An alkaline ionized water controller provided with an electrolyzer and a pH measuring unit for ionized water discharged from the electrolyzer and a control unit for adjusting the pH value by controlling the electrolysis current and the flow rate. The unit has a storage unit for obtaining and storing the correlation between the pH value of ionized water obtained from the pH measurement unit and the flow rate and the gas generation amount in the ionized water. The pH adjustment uses the above correlation from the flow rate and the gas generation amount. The alkaline ionized water conditioner is characterized in that it is carried out by obtaining a pH value.