JPH05317858A - Electrolysis control device for ionized water producer - Google Patents

Abstract

PURPOSE:To provide an electrolysis control device for an ionized water producer by which the pH can easily and freely be selected and controlled in constant. CONSTITUTION:The device is provided with an amplifier 11 by which voltages of both ends of resistance 8 for electric current measurement used for water electrolysis are amplified and then a digital signal is generated, an AD converter 12, a setting switch 13 to select desired pH, microcomputer 9 by which an optimum impression voltage corresponding to the water quality is calculated by receiving the digital signal and an overcurrent is protected, a voltage selection circuit 10 to selectively set a secondary side voltage which is connected to the output of the microcomputer, and a rectifying circuit 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for applying a DC voltage to tap water or the like to generate alkaline ionized water and acidic ionized water. What kind of water is supplied between a positive electrode and a negative electrode for water electrolysis. Even so, it is intended to provide an electrolysis control device for an ion water generator capable of continuously electrolyzing regardless of the water quality.

[0002]

2. Description of the Related Art Electrolyzing normal household water containing various ions to increase the alkaline ion concentration of the water on the cathode side into drinking water, and use the water on the anode side as astringent water with a cosmetic effect. Is known (Ministry of Health, Labor and Welfare Director General of Pharmaceutical Affairs, Yakuhin No. 763, October 8, 1965).

As a method for electrolyzing water to obtain alkaline ionized water, a batch method has been used in the past (Shokai 55-31459).
However, the continuous type in which the generator and the water supply are directly connected and electrolysis is performed while passing water has become the mainstream. When a direct current voltage of several tens of volts is applied between the positive and negative electrodes at intervals of several millimeters installed inside the water electrolysis tank, it depends on the quality of the water, but several A
An electric current of / dm ² flows and water is electrolyzed. On the cathode side, alkali ions contained in water (for example, Ca ²⁺ , Mg ²⁺ ,
As the concentration of (K ⁺ , Na ^+, etc.) increases, water is electrolyzed to generate hydrogen, and hydroxyl ions are generated to make the cathode water alkaline. On the other hand, on the anode side, anions (for example,
The concentration of Cl ⁻ , SO ₄ ²⁻ , NO ₃ ^−, etc. is increased, and oxygen is generated to generate hydrogen ions, so that it becomes acidic.

The total amount of both positive and negative ions in the raw water is closely related to the hardness of water, but when compared at the same applied voltage,
The smaller the ion content, the smaller the electrolysis current, and conversely, the larger the electrolysis current, the more the current increases. Since there is a close relationship between this current value and the pH value of alkaline ionized water, monitor this.
It is important to control. The electrolytic current value is the applied voltage
It depends not only on operational factors such as water flow rate, but also on environmental factors such as water quality and water temperature, that is, water source, season, and time of use. Therefore, even if the same voltage is constantly applied, the pH of the obtained water changes greatly each time. Not only that, but if the electrolytic current becomes too large, an excessive load exceeding the design specifications is applied to the power transformer, causing a failure, or water having a PH value more than necessary for the user is generated. Therefore, it is necessary to detect and control the electrolysis current not only in this type of apparatus but also in various industrial electrolysis apparatus including salt electrolysis in general.

In the ion water generator, there are various means and devices for controlling the current, for example, JP-A-64-1.
1693, Japanese Utility Model Laid-Open No. 1-163494, JP-A-2-203
989 and the like have been proposed, and although each has its own characteristics, they also have drawbacks that are not necessarily the best.

[0006]

As one of the control devices for these conventional ion water generators, there is a method of stopping the power supply to the electrodes by a breaker circuit. This is a method of stopping power supply using a breaker circuit and a timer circuit when an overcurrent is detected by an electrolytic current detection circuit.
Although there is no problem in terms of safety, the power supply will be stopped, and during this time electrolysis will not be possible and untreated water will come out as it is, so it cannot be used continuously.

Apart from this, there is a method of using a current adjusting transistor as a control means. However, if a large amount of current is to be adjusted by using the power transistor, a large space is required for disposing the heat radiation fins, and unnecessary heat is generated, resulting in poor power efficiency.

Yet another method is the same as that of using a current control transistor, but there is a method of controlling the voltage while detecting the electrical resistance of water. As a resistance measuring element in this case, it is said that the existing main electrode in the electrolytic cell may be shared for that purpose, but since current cannot flow in the electrolytic cell while switching to the resistance measuring circuit side, electrolysis is not possible. Since the measurement is interrupted and the state without ohmic loss heat generation when not energized is to be measured, there is a disadvantage that an error occurs unlike the resistance value in the actual electrolysis and it is difficult to control with an optimum voltage.

[0009]

The electrolytic control device of the present invention does not need to break the current during electrolysis with a breaker, use a power transistor, or switch the main circuit of electrolysis as in the conventional case. Is composed of the following circuit. That is, the device of the present invention comprises an amplifier and an AD converter as means for measuring electrolytic current, and
It is a feedback control device consisting of a microcomputer that performs the necessary calculation processing for electrolysis control, and a setting switch and decoder connected to it, a relay circuit, a rectification circuit, etc., and always maintains an appropriate current value without interrupting electrolysis. The applied voltage for continuing the electrolysis can be selected.

[0010]

In the electrolytic control device for an ionized water generator according to the present invention, a resistance for current measurement, which is usually called a shunt or a shunt, is used as a means for measuring the electrolytic current. This is connected between a DC power supply and an electrode to measure the ohmic loss. Since this voltage difference is usually as small as several mV, it is amplified once and then converted into a digital signal and input to the microcomputer. From the viewpoint of operation, the program content of the microcomputer is
By reading the value of electrolysis current that changes every moment, calculate and set the optimum applied voltage required to obtain the water of the desired PH intensity input from the setting switch, and if an excessive current is likely to flow The applied voltage is automatically switched to one rank lower. Supply water quality, temperature,
If the flow rate or the like changes, the electrolysis current also changes, so that it is reflected in the set voltage as well, so that electrolysis is always performed under optimum conditions.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a diagram showing a main constituent circuit used in an electrolytic control device for an ionized water generator according to the invention. Reference numeral 1 is an electrolytic cell, and as main components, an anode 2, a cathode 3, a separator 4,
A water inlet 5, an alkali outlet 6 and an acid outlet 7 are shown. What is applied to the cathodes 2 and 3 is the voltage obtained by full-wave rectifying the secondary voltage of the transformer. Here, the cathode 3 is connected to the power supply circuit via the resistor 8 for measuring the electrolytic current. There is. The voltage signal across the resistor 8 is input to the microcomputer 9 through an amplifier and an AD converter. Microcomputer 9 is R
It consists of AM, ROM, and CPU, but basic data and sequences necessary for electrolysis are stored in RAM in advance. Operating conditions such as pH value of ionic water, strength or water flow / electrolysis / cleaning time are taken in by operating the setting switch, and the calculation of the electrolytic current value necessary to obtain the target water and the actual current Comparison with the value or output control necessary for maintaining electrolysis under optimum conditions is performed on the microcomputer side. It is natural to start or stop energization each time the tap of the water supply is opened and closed, but as a means to judge the presence or absence of water flow into the electrolytic cell, the minimum necessary low voltage is always applied, It is also possible to grasp the timing of energization by determining the change in the current flowing through the resistor 8 with a microcomputer. A voltage selection circuit 10 is composed of a decoder, a relay driving transistor, a relay, and its contacts. The output signal from the CPU of the microcomputer is 2
Since it is a progressive digital signal, it is processed by a decoder and then placed in the base of the relay driving transistor, and the applied voltage suitable for the target electrolysis, that is, the secondary side voltage of the transformer is selectively set at the relay contact.

[0012]

As described above, since the electrolytic control device for the ionized water generator according to the present invention is a feedback system using the current measuring circuit, the microcomputer, and the voltage selecting circuit, electrolysis is performed under the conditions as set. Since it can be maintained, the ion water generator incorporating this control device can easily select and control the PH intensity of water freely and constantly, and therefore has a great practical value.

[Brief description of drawings]

FIG. 1 is a diagram showing a main configuration circuit of an electrolytic control device for an ion water generator that is an embodiment of the present invention.

[Explanation of symbols]

 1 Electrolyzer 8 Resistance 9 Microcomputer 10 Voltage selection circuit. 11 Amplifier 12 AD Converter 13 Setting Switch 14 Rectifier Circuit

Claims (1)

[Claims] 1. An amplifier (11) for amplifying a voltage across a current measuring resistor (8) for water electrolysis and then converting it into a digital signal, an AD converter (12), and a desired PH intensity are selected. Setting switch (13), a microcomputer (9) as a means for receiving the digital signal to calculate an optimum applied voltage according to the water quality and protecting overcurrent, and a transformer connected to the output of the microcomputer. A voltage selection circuit (10) for selectively setting the secondary side voltage, and a rectification circuit (14)
An electrolysis control device for an ionized water generator, comprising: